Concrete placing machine with hydraulic and concrete swivel

Abstract

A concrete placing machine includes a wheeled base unit and a concrete placing pipe assembly extending from the base unit. The base unit includes a lower wheeled portion and an upper swivel portion. An hydraulic swivel device is provided between an hydraulic pump at the upper swivel portion and hydraulically operated devices at the lower portion of the base unit, in order to facilitate communication of pressurized hydraulic fluid between the pump and hydraulic devices, while allowing 360 degrees of rotation of the upper swivel portion relative to the lower wheeled portion. The hydraulic swivel device further provides a passageway therethrough for a concrete connector pipe to connect the pipe assembly at the upper swivel portion to a supply pipe connected to the lower wheeled portion, whereby the upper swivel portion and the pipe assembly are also rotatable with respect to the lower wheeled portion and the supply pipe.

Description

FIELD OF THE INVENTION

[0002] The present invention relates generally to concrete placing devices and, more particularly, to concrete placing devices which are movable and pivotable to place concrete throughout a targeted area.

BACKGROUND OF THE INVENTION

[0003] Concrete placing or distribution devices are connectable to a supply of uncured concrete and function to distribute the uncured concrete at a targeted location remote from the supply of concrete. The uncured concrete is commonly delivered and deposited to construction sites by the use of concrete trucks using a gravity feed chute delivery system. At job sites where access to the targeted area is not practical or possible by the large concrete trucks, the concrete may be deposited into a special boom-truck concrete pumping machine. The concrete pumping machine or truck transports the concrete to the work area through the use of a movable overhead boom and piping system. The overhead boom and piping system includes pivotable sections, which are pivotable relative to one another about generally horizontal axes. Accordingly, as the piping system is extended, it may reach substantial heights. When concrete is to be placed inside buildings or in places where a low ceiling or structural framework is overhead, the use of an overhead boom pumping truck is often not preferred or even practical, such that use of such large pumping trucks is often limited to outdoor applications.

[0004] In applications where concrete is to be placed in areas where there is structural framework over the targeted surface for the uncured concrete, various concrete placing devices have been proposed. Typically, a pipe assembly may be pivotally mounted to a fixed structure or base, such that the pipe assembly may be pivotable to place concrete throughout the area immediately surrounding the fixed structure or base. The pipe assembly may include one or more sections, and may have two sections pivotally connected together for increasing the range of motion of the placing device. However, such devices are not easily movable to the next targeted area and thus may not be practical in large targeted areas or surfaces.

[0005] Other devices have been proposed which provide a base with casters, rollers or wheels and an extendable pipe section pivotally mounted to the base. The placing device thus may be manually movable at the construction site. However, movement of the base is limited and the pipe assembly may not be pivotable through a large sweeping range relative to the base. Because the pipe assemblies and bases may be difficult to move, these units may require physical labor to accomplish the task and may be unable to control the accuracy and placement and depth of the uncured concrete.

[0006] Therefore, there is a need for a concrete placing apparatus, which may be operable to place concrete in buildings and construction areas which have a low vertical clearance, such that access by larger equipment is limited. The concrete placing apparatus should be movable throughout the construction area and provide a pipe assembly which is rotatable approximately 360 degrees, such that the placing apparatus is operable to place concrete in all areas of the targeted placement area or surface.

SUMMARY OF THE INVENTION

[0007] The present invention is intended to provide a concrete placing apparatus which is easily movable throughout a construction site and is operable to place concrete throughout a wide targeted area. The concrete placing apparatus is a low profile unit, which may be movable and operable in areas with a low overhead clearance.

[0008] According to an aspect of the present invention, a concrete placing apparatus for placing uncured concrete at a support structure comprises a swivel base unit, a pipe assembly and a concrete and hydraulic connector device. The swivel base unit comprises a lower wheeled portion and an upper swivel portion, which is rotatable about a vertical axis with respect to the lower portion. The upper portion includes an hydraulic pump. The lower portion includes a plurality of wheels, at least one hydraulic wheel driving motor, which is operable to drive at least one of the wheels, and at least one hydraulic steering device which is operable to steer the wheels. The pipe assembly includes a supply pipe and a discharge pipe. The supply pipe is attached to the lower portion of the base unit and is connectable to a supply of uncured concrete to be placed by the concrete placing apparatus. The discharge pipe extends from the upper portion of the base unit and is rotatable with the upper portion relative to the lower portion. The discharge pipe is connected to the supply pipe via the concrete and hydraulic connector device, which allows uncured concrete to pass from the supply pipe to the discharge pipe, while also allowing hydraulic fluid to pass between the hydraulic pump at the upper swivel portion and the wheel drive motor and/or the steering device at the lower portion, throughout a full 360 degrees of rotation of the upper portion relative to the lower portion.

[0009] In one form, the discharge pipe includes an inner pipe fixedly mounted to the upper portion and an outer pipe pivotally mounted to an outer end of the inner pipe. Preferably, the outer pipe is pivotable relative to the inner pipe via a rotational motor at the outer end of the inner pipe. The rotational motor may be powered by the hydraulic pump at the upper portion of the base unit. Preferably, the outer pipe is pivotable relative to the outer end of the inner pipe throughout a range of at least approximately 300 degrees of rotation. The outer pipe may be pivotable relative to the inner pipe throughout 360 degrees of rotation if the outer pipe is not too long so as to interfere with the swivel base unit.

[0010] Preferably, the concrete and hydraulic connector device includes an outer cylindrical member and an inner cylindrical member, which is rotatable within the outer cylindrical member. The uncured concrete passes through a passageway through the inner cylindrical member, while hydraulic fluid passes between the inner cylindrical member and outer cylindrical member via a plurality of channels and/or passageways in the inner and outer cylindrical members.

[0011] According to another aspect of the present invention, a concrete placing apparatus for placing uncured concrete onto a support structure comprises a swivel base unit and pipe assembly. The swivel base unit includes a lower, wheeled portion and an upper swivel portion, which is rotatable about a vertical axis throughout 360 degrees of rotation with respect to the lower portion. The upper portion includes an elongated beam extending therefrom. The lower portion includes a plurality of wheels, which are drivable and steerable to move the base unit at the support structure. The pipe assembly includes an inner pipe and an outer pipe. The pipe assembly is connectable to a supply of uncured concrete to be placed by the concrete placing apparatus. The inner pipe is mounted to and supported by the elongated beam of the upper portion, while the outer pipe is pivotally mounted to an outer end of the inner pipe. The outer pipe is pivotable throughout a range of at least approximately 300 degrees relative to the inner pipe.

[0012] In one form, the upper portion includes an hydraulic pump and the wheels of the lower portion are operable via at least one hydraulically operable device powered by the hydraulic pump. The pipe assembly further includes a supply pipe attached to the lower portion of the base unit and connectable to the inner pipe. The inner pipe may be connected to the supply pipe via a concrete and hydraulic connector device which allows uncured concrete to pass from the supply pipe to the inner pipe, while also allowing hydraulic fluid to pass between the hydraulic pump and the hydraulically operable devices at the lower portion, throughout the full 360 degrees of rotation of the upper portion relative to the lower portion.

[0013] Therefore, the present invention provides a low profile concrete placing apparatus which is easily movable, self-propelled and operable in areas where there is low overhead clearance. The placing apparatus is drivable and steerable to achieve proper placement of the base unit prior to placing the concrete. The discharge end of the pipe assembly is movable and controllable by an operator or by means of an automatic control system to provide accurate placement and depth of the concrete being placed.

[0014] These and other objects, advantages, purposes and features of the present invention will become apparent upon review of the following specification in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 is a perspective view of a concrete placing apparatus in accordance with the present invention;

[0016] FIG. 2 is a side elevation of the concrete placing apparatus of FIG. 1, with the pipe assembly fully extended;

[0017] FIG. 3 is a side elevation similar to FIG. 2, with the outer pipe of the pipe assembly pivoted back toward the base unit of the concrete placing apparatus;

[0018] FIG. 4 is a top plan view of the concrete placing apparatus of FIG. 3, with the pipe assembly pivoted back toward the base unit on the side of the placing apparatus opposite that of FIG. 3;

[0019] FIG. 5 is a front elevation of the concrete placing apparatus of FIG. 2;

[0020] FIG. 6 is an exploded perspective view of a portion of the base unit of the concrete placing apparatus;

[0021] FIG. 7 is an exploded perspective view of a portion of the drive and steering systems of the concrete placing apparatus of the present invention;

[0022] FIG. 8 is an exploded perspective view of a support beam useful with the present invention;

[0023] FIG. 9 is a partially exploded perspective view of the rotation device for rotating the outer pipe relative to the inner pipe;

[0024] FIG. 10 is an exploded perspective view of the outer pipe and discharge end of the pipe assembly of the present invention;

[0025] FIG. 11 is a perspective view of the connection of the inner pipe to the outer pipe of the pipe assembly;

[0026] FIG. 12 is an exploded perspective view of the connection of the inner end of the inner pipe to connecting pipe sections at the base unit;

[0027] FIG. 13 is a partially exploded perspective view of the supply pipe at the base unit;

[0028] FIGS. 14A and 14B are perspective views of the hydraulic swivel port of the present invention;

[0029] FIG. 15 is a plan view of the hydraulic swivel port of FIGS. 14A and 14B;

[0030] FIG. 16 is a sectional view of the hydraulic swivel port taken along the lines XVI-XVI in FIG. 14B;

[0031] FIGS. 17A-17D are hydraulic schematics of hydraulic systems and controls useful with the present invention; and

[0032] FIGS. 18 and 19 are plan views of the present invention and depict a portion of the process for placing concrete at a targeted area.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] Referring now specifically to the drawings and the illustrative embodiments depicted therein, a concrete placing apparatus 10 includes a movable base unit 12 and a pipe assembly 14 extending from the base unit 12 (FIGS. 1-5). Base unit 12 comprises a lower, wheeled portion 16 and an upper swivel or rotatable portion 18, which is rotatably mounted on lower portion 16 such that upper swivel portion 18 is rotatable 360 degrees about a vertical axis 17 (FIGS. 2 and 5) with respect to lower portion 16. Pipe assembly 14 includes a supply pipe 24 (FIGS. 2 and 3), which is connectable to a supply connector pipe 80 (FIGS. 18 and 19) connected to a supply of uncured concrete to be placed by placing apparatus 10. Pipe assembly 14 further includes an inner pipe section 20, which is fixedly secured at rotatable or swivel portion 18 of base 12 via a support beam 52, and an outer pipe section 22, which is pivotally mounted at an outer end 20a of inner pipe section 20 and an outer end 52a of support beam 52. Supply pipe 24 is pivotally interconnected with inner pipe 20 via a concrete and hydraulic connector device, such as multi-port hydraulic and concrete swivel 32, such that inner pipe 20 is rotatable about vertical axis 17 throughout 360 degrees of rotation with respect to supply pipe 24, as discussed in detail below.

[0034] Swivel portion 18 of base unit 12 includes an hydraulic pump 25 (FIG. 17C) positioned within an engine and pump compartment 42. Hydraulic pump 25 is operable to power and control various hydraulic components or accessories of placing apparatus 10, such as wheel drive systems 28 and steering systems 30 (FIGS. 7 and 17A-17D) at lower, wheeled portion 16 of base unit 12. Base unit 12 further includes multi-port hydraulic swivel unit or device 32 (FIGS. 2, 6, and 14A, 14B, 15, 16 and 17A and 17D), which is interconnected between hydraulic pump 25 and drive systems 28 and steering systems 30 via a plurality of conventional hydraulic lines (not shown). Multi-port hydraulic swivel 32 provides a passageway 72 (FIGS. 14A, 14B and 16) longitudinally therethrough for a pipe connector 34 (FIGS. 2 and 12) to pass through. Multi-port swivel 32 thus allows the upper portion 18 of base 12 to rotate relative to lower portion 16, while allowing concrete to flow from supply pipe 24 to inner pipe 20, while also allowing hydraulic fluid to pass between hydraulic pump 25 and the drive and steering systems 28 and 30, respectively, throughout the full 360 degrees of rotation of upper portion 18 relative to lower portion 16, as discussed below. The multi-port swivel 32 of the present invention thus facilitates placing of uncured concrete throughout a target area and further facilitates easy movement of placing apparatus 10 to a next targeted area when the first targeted area has been completed. Although shown and described as including the hydraulic pump at the upper portion and at least one hydraulically operable device, such as wheel drive motors and/or steering devices, at the lower portion of the base unit, it is envisioned that the hydraulic swivel port may provide fluid communication between a hydraulic pump at the lower base portion which is operable to provide pressure and/or flow of hydraulic fluid or oil to one or more hydraulically operable devices and accessories at an upper base portion, without affecting the scope of the present invention.

Base Unit

[0035] Base unit 12 is preferably a low profile wheeled unit, which is movable and maneuverable at the targeted placing area or support surface. Preferably, base unit 12 includes four wheels 27, two wheels on each of two axles 46a, 46b (FIGS. 4, 5 and 7). Wheels 27 and/or axles 46a, 46b may be independently or simultaneously drivable and steerable to move and maneuver base unit 12 into a proper operating position, as discussed below. Preferably, the lower, wheeled unit 16 is substantially similar to the wheeled base units disclosed in commonly assigned U.S. Pat. Nos. 4,930,935 and 4,978,246, the disclosures of which are hereby incorporated herein by reference.

[0036] Upper portion 18 of base unit 12 preferably includes a control console 36 and an operator seating area 37 to allow an operator to sit at base unit 12 to drive the placing apparatus 10 to the targeted location, to control the rotational movement of the upper portion 18 relative to the lower portion 16, and to further control the pivotable movement of outer pipe 22 relative to inner pipe 20. The control console 36 provides multiple hand controls for an operator to control or actuate and/or deactuate the control valves 39 of the hydraulic fluid system, such that hydraulic fluid or oil is directed to either extend or retract an appropriate or selected hydraulic cylinder or rotate an appropriate or selected hydraulic motor shaft.

[0037] Upper portion 18 further includes an upper frame 40, which supports the operator area 37, control console 36, support beam 52 and engine and pump compartment 42, and which is rotatably mounted to a lower frame 38 of lower portion 16, as discussed below. Pipe support beam 52 extends from a forward end of upper frame 40 and is mounted in a cantilevered manner to upper frame 40 and supports inner pipe 20 therealong. As shown in FIG. 8, support beam 52 may be a two-piece beam which is cantileverly mounted to and extending from platform 40 of base unit 12. A pair of support rods 51 are also provided between beam 52 and a generally vertical support frame 53 at platform 40 to further support beam 52 and limit downward deflection of beam 52.

[0038] Hydraulic pump 25 is operable to power the wheel drive system 28, steering system 30, stabilizers 44, and other vehicle hydraulic functions and/or accessories, and is preferably driven by a diesel engine 86 (FIG. 17D) also positioned within compartment 42. The hydraulic system of placing apparatus 10 is preferably a closed center, load sensing system with manually adjustable flow controls for all functions that require speed control.

[0039] As shown in FIGS. 7 and 17D, wheel drive system 28 of lower portion 16 includes two front propulsion motors 28a and two rear propulsion motors 28b, such that there is one propulsion motor at each wheel 27, whereby each wheel may be independently driven or driven together, such as the pair of wheels at each axle being driven together. Preferably, drive system 28 further includes dual counter balance valves 28c (FIG. 17D) which function as a brake by blocking drive motor return fluid whenever pressure drops to zero in the pressure line. In addition, the shuttle valve section of counter balance valves 28c supplies pressurized fluid to release a spring applied parking brake 29 whenever either propulsion line is pressurized. Without pressure in the propulsion lines, the parking brake 29 is thus automatically applied.

[0040] Steering system 30 of lower portion 16 includes a pair of front hydraulic cylinders 30a at front axle 46a and a pair of rear hydraulic cylinders 30b at rear axle 46b. Hydraulic cylinders 30a, 30b are extendable and retractable to steer the wheels at one or both axles 46a, 46b, respectively, depending on the selected steering mode. Optionally, steering system 30 may be selectably set to steer the wheels in various steering modes, such as a two wheel steering mode, whereby the front wheels are turned while the rear wheels remain straight, similar to a conventional automobile, a four wheel steering mode, whereby turning the steering wheel in one direction correspondingly turns the front wheels towards that direction and the rear wheels in an opposite direction to decrease the turning radius of the unit, and/or a crab steering mode, whereby turning the steering wheel in one direction turns the wheels of both axles in the same direction to allow the vehicle to move at least partially sidewardly or diagonally in the direction the steering wheel is turned. Selecting two wheel, four wheel and/or crab steer mode is accomplished via a selector valve 36a (FIG. 17D) at the control console 36. For example, with the selector valve 36a shifted to a first position, only the front wheels may be steerable via only front cylinders 30a. With the selector valve shifted to a second position, all four wheels may be steerable to provide the shortest possible turning radius. Additionally, with the lever shifted to a third position, the wheels may crab steer to allow diagonal movement of placing apparatus 10. The present invention thus provides optimal maneuverability of the base unit to facilitate proper positioning of the base unit at the targeted placement area.

[0041] Upper frame 40 of upper swivel portion 18 is pivotally mounted to lower frame 38 of lower portion 16 via a swivel mount 38a secured to lower frame 38 (FIG. 6). Upper portion 18 further includes a rotational hydraulic motor 50 (FIG. 17B) which is positioned generally adjacent to an opening 40a at upper frame 40 to engage a ring gear 48 secured to lower frame 38. Rotational motor 50 is rotatable to cause relative rotation between upper frame 40 and ring gear 48 of lower frame 38. Rotational motor 50 is a reversible motor to allow 360 degrees of rotation of upper portion 18 relative to lower portion 16 in either direction. Preferably, the rotational motor 50 includes a brake 50a (FIG. 17B) which is operable to stop the rotation of the motor and thus the rotation of the upper portion 18.

[0042] Lower frame 38 of lower portion 16 of base unit 12 rotatably supports upper frame 40 and includes a stabilizer 44 mounted at each corner of the frame 38. Stabilizers 44 are preferably hydraulically extendable support members which extend to contact the support surface and at least partially support the base unit, to enhance the stability of unit of when the unit is in operation. Each of the front stabilizers includes an hydraulic cylinder 44a, while the rear stabilizers include rear hydraulic cylinders 44b, which are operable to extend and retract the stabilizers 44, as is known in the art. The hydraulic fluid for the stabilizers is also controlled by the hydraulic pump 25 via the multi-port swivel device 32, as discussed below.

[0043] Hydraulic pump 25 at upper portion 18 of base unit 12 is thus operable to provide pressurized hydraulic fluid or oil to hydraulic cylinders and/or motors at the upper and lower portions of base unit 12, such as for steering and/or driving the wheels of lower portion 16 via the hydraulic lines and hydraulic swivel port 32, as discussed in detail below.

Pipe Assembly

[0044] In the illustrated embodiment, each pipe section 20, 22 and 24 is a conventional or known concrete pipe or tubing, such as a steel pipe section with a nominal inside diameter of approximately 5 inches, or any other known piping or tubing section. The pipe sections are oriented generally horizontally and are pivotable relative to one another about generally vertical axes 17 and 19, such that placing apparatus 10 is a low profile unit and is operable in areas with generally low overhead clearance, such as in buildings and/or the like, as discussed below.

[0045] Supply pipe 24 is fixedly secured along a lower surface of lower frame 38 of lower portion 16 of base unit 12. A supply connecting end 24a of supply pipe 24 is connectable to supply hoses or pipes 80 (FIGS. 18 and 19) via a conventional quick connect coupling or any other coupling means. Although shown as extending from the center region of base unit 12 toward the rear of the base unit, the supply pipe may otherwise extend in other directions relative to the base unit, such as sidewardly for connection to a side feed system, or may be rotatable relative to the base unit, without affecting the scope of the present invention.

[0046] An inner end 24b of supply pipe 24 is connected to a lower 90 degree elbow 70 (FIG. 13), which in turn is connected to a lower end 34a (FIG. 12) of connector section 34. An upper end 34b of connector section 34 is also connected to an upper 90 degree elbow 68 (FIG. 12). Connector section 34 is rotatably connected to one or both of lower elbow 70 and upper elbow 68, such that the elbow connectors are rotatable relative to one another about vertical axis 17, which passes longitudinally through connector section 34. The elbow or elbows may be rotatably connected to connector section 34 via any known connecting means, such as via a collar 35 (FIGS. 12 and 13) which engages corresponding lips on the elbows 68 and/or 70 and connecting section 34 to retain the pipe sections together, while allowing relative rotation therebetween. Connector section 34 extends through passageway 72 in multi-port hydraulic swivel 32, such that connector section 34 may be rotated about axis 17 relative to an inner and/or outer portion of multi-port hydraulic swivel 32, as discussed below.

[0047] At the upper end of connector 34, an inner end 20b of inner pipe 20 is connected to upper elbow 68 to connect supply pipe 24 to inner pipe 20 via the pair of 90 degree elbows 68 and 70 and connector 34, whereby inner pipe 20 is rotatable 360 degrees relative to supply pipe 24 about axis 17. Inner pipe 20 of pipe assembly 14 extends from base unit 12 and is at least partially supported along pipe support beam 52 of upper portion 18 of base unit 12 (FIGS. 1-5). Inner pipe 20 is secured to pipe support beam 52 and thus is generally fixed with respect to support beam 52 and upper portion 18 of base unit 12.

[0048] Outer end 20a of inner pipe 20 is connected to a second upper elbow 21a, which in turn is connected to a vertical connector section 21b, which is connected to a lower elbow 21c at an inner end 22a of outer pipe 22, thereby providing a generally S shaped connection of inner pipe 20 to outer pipe 22, as shown in FIG. 2. Similar to connector 34, one or both ends of connector section 21b is rotatably connected to the respective elbow sections 21a, 21c, such that outer pipe 22 is pivotable relative to inner pipe 20 about a generally vertical axis 19 extending longitudinally through connector section 21b. Connector section 21b may be fixedly or pivotally secured at outer end 52a of beam 52 by a mounting bracket or collar 64 (FIGS. 9 and 10), while elbows 21a and/or 21c allow pivotable or rotational movement of outer pipe 22 relative to inner pipe 20 and beam 52. For example, upper elbow 21a may be pivotally connected to connecting section 21b, to allow relative movement therebetween, while connecting section 21b is pivotally mounted to bracket 64. Alternately, connecting section 21b may be fixedly secured to bracket 64, whereby lower elbow 21c is pivotally mounted to the lower end of connecting section 21b via a collar 21d (FIGS. 9 and 10) to allow for the pivotal movement of outer pipe 22 relative to inner pipe 20.

[0049] Additionally, outer pipe 22 includes a discharge outlet 23 at an outer end 22b where uncured concrete is discharged from pipe assembly 14 in a generally downwardly direction. Discharge outlet 23 may comprise a 90 degree elbow section (as shown in FIGS. 1-5) and/or a generally vertically oriented tube or hose for downward discharge of uncured concrete onto the targeted area or support surface. Optionally, other discharge hoses or nozzles may be implemented, and may be selected or adjusted to discharge the uncured concrete generally vertically or at any other angle, such as partially laterally, with respect to the support surface, without affecting the scope of the present invention. It is further envisioned that the angle or direction of the discharge nozzle may be adjusted while placing the uncured concrete to further enhance the placing capabilities of the placing apparatus of the present invention.

[0050] As best shown in FIGS. 4 and 18, outer pipe 22 is pivotable relative to inner pipe 20 about axis 19, such that the outer discharge outlet 23 of pipe 22 is arcuately movable with respect to inner pipe 20 throughout an arcuate sweep of at least approximately 300 degrees. It is further envisioned that the placing apparatus of the present invention may otherwise include an outer pipe 22′ (as shown in phantom in FIG. 4), which has a selected length that is short enough to avoid interference with base unit 12 during pivotable movement or rotation of the outer pipe 22′ relative to the inner pipe 20. Outer pipe 22′ is thus pivotable relative to inner pipe 20 to provide an arcuate or circular sweep of the discharge end 23′ throughout 360 degrees of rotation.

[0051] Pipe assembly 14 further includes a boom rotation device 54 (FIGS. 1-5 and 9-11), which is mounted at outer end 52a of support beam 52 and which is operable to pivot outer pipe 22 relative to inner pipe 20. As best shown in FIG. 9, boom rotation device 54 includes a rotary actuator 56, which is operable to rotate a sprocket wheel 58 in either direction in response to hydraulic fluid from hydraulic pump 25. A second sprocket wheel 60 is fixedly secured to a collar member 21d at connecting section 21b and elbow 21c of pipe assembly 14, such that rotation of the second sprocket wheel 60 causes corresponding pivotal movement of lower elbow 21c and outer pipe 22 about axis 19. The sprocket wheels 58 and 60 are interconnected by a chain or belt 62, such that rotation of sprocket wheel 58 by rotary actuator 56 causes a corresponding rotation of sprocket wheel 60 via chain 62, thereby pivoting outer pipe 22 relative to inner pipe 20 about axis 19. Preferably, a safety housing 65 is secured around sprocket wheels 58 and 60 and chain 62, to protect the sprocket wheels and chains from contaminants and to prevent items from getting caught between the chain or belt 62 and wheels 58, 60, as outer pipe 22 is pivoted relative to inner pipe 20.

[0052] As best shown in FIG. 11, pipe assembly 14 further includes an elongated support member 66, such as a cable or the like, which is connected between a bracket 66a at outer end 52a of beam 52 and a bracket 66b secured along outer pipe 22. Cable 66 provides support for outer pipe 22 as it extends from support beam 52 and connector pipes and elbows 21a, 21b, 21c. Preferably, cable 66 includes a tension adjustment device, such as turnbuckle 66c, to facilitate adjustment of the tension in the cable 66 to provide an appropriate amount of support of outer pipe 22.

[0053] Optionally, placing apparatus 10 may include a lift cylinder (not shown) at pipe assembly 14 which is operable to raise and lower discharge end 23 relative to base unit 12. Such a lift cylinder allows increased degrees of mechanical freedom and facilitates delivery of uncured concrete over obstacles such as low walls and/or foundations commonly found on construction worksites. Additionally, a second knuckle or joint, and additional pipe sections, may be added at the outer end of outer pipe 22, to further enhance movement of the discharge end of the pipe assembly relative to the base unit. One or more of the pipe sections of pipe assembly 14 may also include an axis of rotation about a longitudinal axis along the length of the pipe sections, thereby further increasing the freedom of movement of the discharge end relative to the base unit.

[0054] It is further envisioned that placing apparatus 10 may include a screeding device (not shown) at an outer end of the pipe assembly 14, which is operable to grade and smooth the uncured concrete at the support surface following discharge from said discharge outlet. The screeding device may be a conventional screeding device, or may be a laser controlled screed similar to the types disclosed in commonly assigned U.S. Pat. No. 4,655,633, issued to Somero et al., and/or U.S. Pat. No. 4,930,935, issued to Quenzi et al., the disclosures of which are incorporated herein by reference. Optionally, the placing apparatus 10 may include a strike-off plow at the end of the pipe assembly to assist with leveling of the concrete. The plow could be laser controlled for more accurate elevation results prior to screeding. Additionally, a vibratory plow and auger, or a type of bell screed may be otherwise or also included at the outer end of the pipe assembly, without affecting the scope of the present invention.

[0055] In applications where a screeding device or other device, such as a discharge adjusting device or control or a pipe adjusting device, is hydraulically controlled and positioned along outer pipe 22′, which is rotatable 360 degrees relative to inner pipe 20, a second multi-port hydraulic and concrete swivel device (not shown) may be positioned at and around connector section 21b at the outer end of the support beam 52. The second multi-port swivel allows for passage of concrete and hydraulic fluid toward discharge end 23 of outer pipe 22′, while allowing 360 degrees of rotation of outer pipe 22′ relative to inner pipe 20, in a similar manner as discussed below with respect to multi-port hydraulic and concrete swivel device 32.

Hydraulic and Concrete Swivel Device

[0056] Referring now to FIGS. 14-16, hydraulic and concrete swivel device 32 includes an outer cylindrical portion 74 and an inner cylindrical portion 76, which is rotatably received within outer cylindrical portion 74. Outer portion 74 includes a plurality of openings or ports 74a through an outer wall 74d of the outer portion 74. The ports 74a are vertically spaced from one another, such that each of the ports 74a is positioned at a different height or level along outer cylindrical portion 74. Each port 74a is fitted with an appropriate fitting or connector 78 to connect the opening or port 74a to an appropriate hydraulic fluid line (not shown).

[0057] Inner cylindrical portion 76 likewise includes a plurality of ports or openings 76a positioned about an upper surface 76b and about an upper, outer surface 76f of a cylindrical body or wall 76c of inner cylindrical portion 76. As shown in FIG. 16, cylindrical body 76c of inner portion 76 includes a lower outer surface 76g, which has a narrower diameter than upper outer surface 76f, in order to provide a stepped surface 76h to engage an upper surface 74f of outer cylindrical portion 74 when inner portion 76 is rotatably received within outer portion 74. The ports 76a of inner cylindrical portion 76 are connected to a plurality of fittings or connectors 80 for connecting the ports 76a to the appropriate hydraulic lines (not shown). In the illustrated embodiment, the outer and inner cylindrical portions 74, 76 include fourteen corresponding passageways and ports, although other quantities of passageways and ports may be provided, without affecting the scope of the present invention. It is envisioned that additional passageways and ports could be added to the swivel device if necessary to control additional components or accessories on the lower portion 16 of base unit 12 via hydraulic pump 25 or another pump at upper portion 18.

[0058] As shown in FIG. 16, each port 74a of outer cylindrical portion 74 is connected to one of a plurality of vertically spaced annular channels 74b around an inner surface 74c of outer cylindrical portion 74. Each port 76a of inner cylindrical portion 76 is connected to a corresponding one of a plurality of generally vertical and spaced or separated passageways 76d within and along the cylindrical wall 76c of inner portion 76. Each passageway 76d in inner portion 76 terminates at a different level and is open at outer surface 76g of inner cylindrical portion 76 via a passageway 76e, such that each port 76a and its respective passageway 76d are connected to an appropriate or corresponding one of the annular channels 74b along the inner surface 74c of outer cylindrical portion 74. A plurality of O-rings or seals 74e are provided between the annular channels 74b to prevent hydraulic fluid from leaking between the passageways and channels of the inner and outer portions of hydraulic swivel port 32. Accordingly, pressurized fluid at one of the fittings 80 at ports 76a may pressurize and/or flow along a corresponding vertical passageway 76d within cylindrical wall 76c and into a respective annular channel 74b of outer portion 74, and further through the respective port 74a and fitting 78 to provide pressure and/or flow to the respective component or accessory of lower portion 16 of base unit 12. Each port 76a is thus interconnected with a corresponding port 74a irrespective of any relative rotation between inner and outer cylindrical portions 76, 74 of multi-port hydraulic and concrete swivel 32.

[0059] When installed on base unit 12 of placing apparatus 10, a mounting plate 79 of outer cylindrical portion 74 is secured to lower frame 38 of lower portion 16, while a mounting plate 77 of inner cylindrical portion 76 is secured to upper frame 40 of upper portion 18. Connecting section 34 of pipe assembly 14 is then insertable through passageway 72 and connectable to the upper and lower elbows 68, 70, respectively, as discussed above. Because the upper hydraulic lines, which connect to fittings 80 at ports 76a, and the upper elbow 68 and inner pipe 20 of pipe assembly 14 are all substantially fixed relative to upper frame 40 and upper portion 18, and thus to upper or inner cylindrical portion 76 of multi-port swivel device 32, the hydraulic lines and pipe sections will not become twisted or entangled as the upper portion 18 is rotated 360 degrees relative to the lower portion 16. Likewise, the hydraulic lines and concrete pipes at lower portion 16 of base unit 12 are generally fixed relative to lower portion 16 of base unit 12 and thus to lower or outer cylindrical portion 74 of multi-port swivel device 32, to also avoid twisting or entanglement of the hydraulic lines and concrete pipes as the upper portion 18 is rotated relative to the lower portion 16 of the base unit 12.

Hydraulic Schematic

[0060] Referring now to FIGS. 17A-17D, an hydraulic schematic of the illustrated embodiment of the present invention is shown. Hydraulic fluid from hydraulic pump 25 (FIG. 17C) is pressurized and/or pumped to control various valves and controls to actuate and/or deactuate the hydraulic cylinders and hydraulic motors of placing apparatus 10. More particularly, hydraulic pump 25 may control the stabilizer cylinders 44a (FIG. 17A), the rotational hydraulic motor 50 (FIG. 17B), the rotary actuator 56 (FIG. 17B), the wheel steering cylinders 30 (FIG. 17D), the propulsion motors 28 (FIG. 17D) and any other hydraulic control valves, hydraulic cylinder valves, pressure relief valves, and/or the like of placing apparatus 10. Each component or accessory positioned or mounted at lower portion 16 of base unit 12 is interconnected to the hydraulic pump 25 via hydraulic swivel 32. More particularly, each pair of steering cylinders 30, such as the front steering cylinders 30a and the rear steering cylinders 30b, are interconnected to the hydraulic pump via the hydraulic swivel 32. Similarly, the front propulsion motors 28a with brakes 28c are connected to the hydraulic pump via the hydraulic swivel 32, while the rear propulsion motors 28b are also connected to the pump via the hydraulic swivel 32. Additionally, the rear stabilizer cylinders 44b are connected to corresponding ports on the hydraulic swivel 32, while each of the front stabilizer cylinders 44a are preferably connected to separate ports on the hydraulic swivel device 32. Accordingly, the hydraulic system of the present invention is operable to control the stabilizer cylinders, the drive motors and the steering cylinders of the lower portion 16 of the base unit 12 by interconnection of the hydraulic pump 25 to the respective components via the hydraulic swivel device 32, such that the hydraulic pump 25 and upper portion 18 may be pivoted relative to the lower portion 16 of base unit 12.

[0061] Optionally, placing apparatus 10 includes a diverter valve 82 (FIG. 17B) which is operable to allow placing apparatus 10 to be shifted from a drive mode to a boom mode or placing mode when the placing apparatus is parked at an appropriate position for placing concrete. By shifting the placing apparatus to the boom mode, the pilot flow for propulsion is shifted to the rotary actuator 56 and rotational motor 50 via energizing a pair of solenoids 82a in diverter valve 82. Propulsion pilot flow is blocked off at the same time by the shifting of the two solenoid valves, such that the fluid cannot flow to or pressurize the wheel drive motors. De-energizing the solenoids blocks off the rotary actuator pilot flow and diverts it once again to the propulsion section of the directional valve, whereby placing apparatus 10 is again operable in the drive mode, in order to move the placing apparatus to a new targeted location.

Method of Operation

[0062] Referring now to FIGS. 18 and 19, concrete placing apparatus 10 is first driven to a starting point of the application (FIG. 18). Uncured concrete is delivered to placing apparatus 10 through a series of connected steel concrete delivery pipes and rubber hose sections 80 that are laid along the ground at the job site. The pipe sections originate at a temporary concrete pumping station (not shown) set up for the application. The advantages of the present invention are that the concrete trucks and traffic remain outside, and only a small doorway or opening (not shown) is needed at the building to allow the passage of the concrete delivery pipes into the building and to placing apparatus 10.

[0063] Once concrete placing apparatus 10 is at the appropriate location, placing apparatus 10 may be switched from the drive mode to the boom mode, as discussed above. The concrete supply pipes 80 are laid out on the ground and connected to supply pipe 24 of lower portion 16 using standard quick connect concrete piping hardware or the like. Although shown with the concrete delivery piping connecting to the rear of placing apparatus 10, the delivery piping may connect to supply pipe 24 at either side or at the front of the concrete placing apparatus, preferably at or near ground level, without affecting the scope of the present invention. With concrete placing apparatus 10 in position and connected to the supply piping 80, the operator extends the boom by swinging the outer pipe 22 until it is generally co-linear with inner pipe 20, such that the discharge end 23 is in the position furthest from base unit 12 (as shown by pipe 20, 22 extending to the left in FIG. 18). Clearly, however, the pipes may be initially oriented in other positions, without affecting the scope of the present invention.

[0064] Once positioned in a selected initial position and orientation, uncured concrete is pumped through the supply lines 80 into concrete placing apparatus 10 and upward through the center of the machine. The concrete continues through the inner and outer pipe sections and is discharged from the discharge end 23 of pipe assembly 14. The upper portion 18 is rotated relative to lower portion 16 of base unit 12 to swing the discharge end arcuately relative to base unit 12. Additionally, outer pipe 22 may be pivoted relative to inner pipe 20, to further swing the discharge end 23 of outer pipe 22 relative to inner pipe 20 and base unit 12. The outer pipe 22 may be pivoted simultaneously or separately as upper portion 18 is rotated relative to lower portion 16. The pipes and base unit may move or rotate in a coordinated manner to sweep the discharge end arcuately or to move the discharge end in a generally linear manner for linear placement of the uncured concrete along a targeted area. Concrete is thus pumped through the pipe assembly from the external pumping station such that uncured concrete is distributed onto the work area surface with steady and controlled movements of the upper portion 18 and pipe section 22.

[0065] The movements of the upper portion and the pipe section may be controlled manually by an operator sitting at the base unit 12, or automatically, such as by a computerized microprocessor system. The microprocessor system may be programmable to automatically manage the hydraulic functions and the placement of the concrete in a predetermined manner or pattern. The automatic control system may further include a flow sensor 84 (FIGS. 18 and 19) in the pipe assembly 14 which is operable to independently measure the volume and rate of the concrete being delivered through pipe assembly 14. These measurements may be used to automatically adjust the movements of the base unit and pipe assembly, through the use of the computerized microprocessor system and associated software, thereby providing generally uniform distribution of uncured concrete on the ground or support surface. The placing apparatus of the present invention may include a control system whereby an operator located at the seating area 37 may be able to directly control the concrete flow at the separate concrete delivery pump. Control of the concrete flow could also be performed automatically in response to the detected flow rates by the flow sensor 84. Optionally, the machine may be controllable by an operator located remotely from the placing apparatus via a remote control radio system.

[0066] Preferably, the sections of the supply piping 80 which connect nearest to base unit 12 are flexible rubber hose sections, in order to allow the placing apparatus to maneuver a short distance if needed while continuously placing concrete with the pipe sections. Once the full area of concrete delivery for the given pipe reach of the apparatus has been achieved, as shown in FIG. 18, the pumping station temporarily stops the pumping of concrete to allow the concrete placing apparatus 10 to be detached from the concrete supply tubes and to be driven to a new working position by the operator. Once the concrete placing apparatus 10 has been moved to its new location, as shown in FIG. 19, the concrete delivery system 80 may be reconnected to supply pipe 24 and pumping and placement of the uncured concrete may resume. Concrete placement work can then continue as described above to place concrete at the new targeted area. This process is repeated until the entire placement application is completed.

[0067] Therefore, the present invention provides a concrete placing machine which is movable and maneuverable in areas where there is low overhead clearance, such as within buildings and the like, since the pipes are pivotable horizontally about a generally vertical axis. The concrete placing apparatus includes a rotatable and movable base unit, which has a swivel portion rotatably supported by a wheeled portion of the unit to swing or pivot a pipe assembly 360 degrees about a generally vertical axis at the base unit. Preferably, the pipe assembly includes an inner pipe attached to the base unit and an outer pipe pivotally connected at an outer end of the inner pipe, to further enhance the placing capabilities of the present invention.

[0068] The upper swivel portion of the concrete placing machine includes an hydraulic pump, which is operable to provide pressurized fluid to various hydraulically controlled valves, controls and components of the placing apparatus. The lower portion includes one or more hydraulically operated drive systems, steering systems and/or stabilizer cylinders, and/or any other hydraulically powered and/or controlled devices, which are powered and controlled by the hydraulic pump. A multi-port hydraulic swivel facilitates hydraulic fluid flow and/or fluid pressure between the hydraulic pump and the hydraulically operated components or accessories at the lower portion, while also allowing for 360 degrees of rotation of the upper portion relative to the lower portion. The hydraulic swivel device further provides a passageway for a concrete connector pipe, such that the concrete pipe assembly is also rotatable 360 degrees relative to a lower supply pipe attached at the lower portion of the base unit. Rotation of the upper portion relative to the lower portion and/or pivotable movement of the outer pipe relative to the inner pipe may be manually controlled by an operator or may be automatically controlled by a programmable computer. The present invention thus provides improved placing capabilities in areas where it is not practical to implement concrete placing trucks and boom trucks.

[0069] Changes and modifications in the specifically described embodiments can be carried out without departing from the principles of the invention, which is intended to be limited only by the scope of the appended claims, as interpreted according to the principles of patent law.

Claims

1. A concrete placing apparatus for placing uncured concrete at a support surface, said concrete placing apparatus comprising: a swivel base unit comprising a wheeled lower portion having a plurality of wheels and an upper portion, said upper portion being rotatable about a generally vertical axis with respect to said lower portion, one of said upper and lower portions including an hydraulic pump, at least the other one of said upper and lower portions including at least one hydraulically operated device; a pipe assembly having a supply pipe and a discharge pipe, said supply pipe being attached to said lower portion of said base unit and connectable to a supply of uncured concrete to be placed by said concrete placing apparatus, said discharge pipe extending from said upper portion of said base unit and being rotatable with said upper portion relative to said lower portion and said supply pipe; and a concrete and hydraulic connector device, said discharge pipe being connected to said supply pipe via said concrete and hydraulic connector device, said hydraulic pump and said at least one hydraulically operated device being connected via said concrete and hydraulic connector device, said concrete and hydraulic connector device being operable to allow uncured concrete to pass from said supply pipe to said discharge pipe, while also allowing hydraulic fluid to pass between said hydraulic pump and said at least one hydraulically operated device throughout 360 degrees of rotation of said upper portion relative to said lower portion about said generally vertical axis.

2. The concrete placing apparatus of claim 1, wherein said upper portion includes said hydraulic pump and said lower portion includes said at least one hydraulically operated device.

3. The concrete placing apparatus of claim 2, wherein said at least one hydraulically operated device includes at least one wheel drive motor which is operable to drive at least one of said wheels and at least one steering device which is operable to steer at least one of said wheels.

4. The concrete placing apparatus of claim 1, wherein said discharge pipe includes an inner pipe fixedly mounted to said upper portion and an outer pipe pivotably mounted to an outer end of said inner pipe.

5. The concrete placing apparatus of claim 4, wherein said outer pipe is pivotable relative to said inner pipe via a rotational motor at said outer end of said inner pipe.

6. The concrete placing apparatus of claim 5, wherein said rotational motor is powered by said hydraulic pump at said base unit.

7. The concrete placing apparatus of claim 5, wherein said rotational motor is operable to rotate a first cog wheel at said outer end of said inner pipe, which in turn drives a second cog wheel fixedly secured to an inner end of said outer pipe to pivot said outer pipe relative to said inner pipe.

8. The concrete placing apparatus of claim 4, wherein said outer pipe is at least partially supported by an elongated support member extending from said outer end of said inner pipe to an attachment point along said outer pipe.

9. The concrete placing apparatus of claim 4, wherein said outer pipe is pivotable relative to said outer end of said inner pipe throughout a range of at least approximately 300 degrees of rotation.

10. The concrete placing apparatus of claim 9, wherein said outer pipe is pivotable 360 degrees relative to said outer end of said inner pipe.

11. The concrete placing apparatus of claim 1, wherein said lower portion comprises four wheels, a first pair of wheels being at a first axle and a second pair of wheels being at a second axle.

12. The concrete placing apparatus of claim 11, wherein each of said wheels is independently driven by an hydraulically operated wheel drive motor.

13. The concrete placing apparatus of claim 11, wherein said lower portion includes a steering device which is operable to steer the wheels at each of said axles.

14. The concrete placing apparatus of claim 13, wherein said steering device is operable to steer said first and second pairs of wheels together.

15. The concrete placing apparatus of claim 11, wherein said concrete placing apparatus is selectably operable to at least one of independently steer each of said first and second pairs of wheels at each of said first and second axles, and steer said first and second pairs of wheels together.

16. The concrete placing apparatus of claim 1, wherein said upper portion of said base unit includes a rotary motor which is operable to rotate said upper portion relative to said lower portion.

17. The concrete placing apparatus of claim 1, wherein said concrete and hydraulic connector device is operable to allow hydraulic fluid to pass through a plurality of fluid passageways, while allowing concrete to pass through an inner passageway of said concrete and hydraulic connector device.

18. The concrete placing apparatus of claim 17, wherein said concrete and hydraulic connector device comprises an outer cylindrical member and an inner cylindrical member which is rotatable within said outer cylindrical member.

19. The concrete placing apparatus of claim 18, wherein at least one of said inner and outer cylindrical members include a plurality of passageways which provide passageway of the hydraulic fluid between said inner cylindrical member and said outer cylindrical member.

20. The concrete placing apparatus of claim 19, wherein each of said plurality of channels comprises one of a plurality of generally vertical passageways through said inner cylindrical member and one of a plurality of annular channels in said outer cylindrical member.

21. The concrete placing apparatus of claim 20, wherein said plurality of generally vertical passageways open toward said outer cylindrical member at a different height from one another, said plurality of annular channels being vertically spaced along the length of said outer cylindrical member.

22. The concrete placing apparatus of claim 21, wherein said outer cylindrical member is mounted to said lower portion of said base unit and said inner cylindrical member is mounted to said upper portion of said base unit.

23. The concrete placing apparatus of claim 1, wherein said pipe assembly includes a flow sensor which is operable to measure a flow of uncured concrete through said discharge pipe.

24. The concrete placing apparatus of claim 1 further including a programmable control, said control being operable to move rotate said upper portion in a programmed pattern to place concrete at the support surface.

25. The concrete placing apparatus of claim 24, wherein said pipe assembly includes a flow sensor which is operable to measure a flow of uncured concrete through said discharge pipe, said control being further operable to adjust the supply of uncured concrete in response to said flow sensor.

26. The concrete placing apparatus of claim 1, wherein said placing apparatus comprises a low profile placing apparatus which is suitable to place the uncured concrete at areas under overhead structures.

27. A concrete placing apparatus for placing uncured concrete at a support surface, said concrete placing apparatus comprising: a swivel base unit comprising a wheeled lower portion and an upper portion, said upper portion being rotatable about a vertical axis throughout 360 degrees of rotation with respect to said lower portion, said lower portion comprising a plurality of wheels which are drivable and steerable to move said base unit at the support surface; and a pipe assembly having an inner pipe and an outer pipe, said pipe assembly being connectable to a supply of uncured concrete to be placed by said concrete placing apparatus, said inner pipe being mounted to and extending from said upper portion, said outer pipe being pivotably mounted to an outer end of said inner pipe, whereby said outer pipe is pivotable throughout a range of at least approximately 300 degrees relative to said inner pipe.

28. The concrete placing apparatus of claim 27 further including an hydraulic pump which is operable to provide at least one of pressure and flow to at least one hydraulically operable device, said hydraulic pump being positioned at one of said upper and lower portions and at least one of said at least one hydraulically operable device being positioned at the other of said upper and lower portions of said base unit.

29. The concrete placing apparatus of claim 28, wherein said hydraulic pump is positioned at said upper portion of said base unit and is operable to provide pressure and flow of hydraulic fluid to said hydraulically operable device positioned at said lower portion of said base unit.

30. The concrete placing apparatus of claim 29, wherein said wheels of said lower portion are operable via said at least one hydraulically operable device powered by said hydraulic pump.

31. The concrete placing apparatus of claim 29, wherein said pipe assembly includes a supply pipe attached to said lower portion of said base unit and connectable to said inner pipe, said inner pipe being connected to said supply pipe via a concrete and hydraulic connector device which allows uncured concrete to pass from said supply pipe to said inner pipe, while also allowing hydraulic fluid to pass between said hydraulic pump and said at least one hydraulically operable device throughout the full 360 degrees of rotation of said upper portion relative to said lower portion.

32. The concrete placing apparatus of claim 31, wherein said concrete and hydraulic connector device comprises an outer cylindrical member and an inner cylindrical member which is rotatable within said outer cylindrical member.

33. The concrete placing apparatus of claim 32, wherein said inner cylindrical member includes a passageway longitudinally through said inner cylindrical member, said passageway being adapted to allow the uncured concrete to pass therethrough.

34. The concrete placing apparatus of claim 31, wherein said outer pipe is pivotable relative to said inner pipe via an hydraulic rotating motor which is powered by said hydraulic pump of said upper portion.

35. The concrete placing apparatus of claim 31, wherein said outer pipe is pivotable relative to said inner pipe via a rotational motor at said outer end of said inner pipe.

36. The concrete placing apparatus of claim 35, wherein said rotational motor is powered by said hydraulic pump at said upper portion of said base unit.

37. The concrete placing apparatus of claim 35, wherein said rotational motor is operable to rotate a first cog wheel at said outer end of said inner pipe, which in turn drives a second cog wheel fixedly secured to an inner end of said outer pipe to pivot said outer pipe relative to said inner pipe.

38. The concrete placing apparatus of claim 27, wherein said upper portion of said swivel base unit includes an elongated beam extending therefrom and supporting said inner pipe.

39. The concrete placing apparatus of claim 38, wherein said outer pipe is at least partially supported by an elongated support extending from said outer end of said elongated beam to an attachment point along said outer pipe.

40. The concrete placing apparatus of claim 27, wherein said upper portion of said base unit includes a rotary motor which is operable to rotate said upper portion relative to said lower portion.

41. The concrete placing apparatus of claim 27 further including a programmable control, said control being operable to move and/or rotate said upper portion in a programmed pattern to place concrete at the support surface.

42. The concrete placing apparatus of claim 41, wherein said pipe assembly includes a flow sensor which is operable to measure a flow of uncured concrete through said discharge pipe, said control being farther operable to adjust the supply of uncured concrete in response to said flow sensor.

43. The concrete placing apparatus of claim 27, wherein said placing apparatus comprises a low profile placing apparatus which is suitable to place the uncured concrete at areas under overhead structures.

44. The concrete placing apparatus of claim 27, wherein said outer pipe is pivotable throughout a range of 360 degrees relative to said inner pipe.

45. A method of placing uncured concrete at a support surface comprising: providing a placing apparatus comprising a swivel base unit having a lower wheeled portion and an upper portion, one of said upper and lower portions including an hydraulic pump, at least the other one of said upper and lower portions including at least one hydraulically operated device, said placing apparatus further including a supply pipe at said lower portion and a discharge pipe at said upper portion, said placing apparatus further including a concrete and hydraulic connector device, said discharge pipe being connected to said supply pipe via said concrete and hydraulic connector device, said hydraulic pump and said at least one hydraulically operated device being connected via said concrete and hydraulic connector device; supplying uncured concrete at said supply pipe; discharging the supplied uncured concrete via said discharge pipe; rotating said upper portion relative to said lower portion while the uncured concrete is supplied at said supply pipe; and controlling said at least one hydraulically operated device via said hydraulic pump while supplying uncured concrete at said supply pipe and while rotating said upper portion throughout 360 degrees of rotation relative to said lower portion.

46. The method of claim 45 including rotating an outer portion of said discharge pipe about a generally vertical axis with respect to an inner portion of said discharge pipe throughout a range of approximately 300 degrees.

47. The method of claim 46 including rotating said outer portion with respect to said inner portion throughout a range of 360 degrees.

48. The method of claim 45 including rotating an outer cylindrical portion of said concrete and hydraulic connector device relative to an inner cylindrical portion of said concrete and hydraulic connector device to maintain interconnection of a plurality of hydraulic fluid passageways within said outer and inner cylindrical portions throughout 360 degrees of rotation.

49. The method of claim 48 including supplying the uncured concrete from said supply pipe to said discharge pipe via a longitudinal passageway through said inner cylindrical portion of said concrete and hydraulic connector device.

50. The method of claim 45 including detecting a flow of uncured concrete through one of said supply and discharge pipes and controlling the supply of the uncured concrete in response to the flow detection.