TECHNICAL FIELD
The present invention relates to a casing assembly for securing a hydraulic breaker hammer for use as a pile driver.
BACKGROUND ART
It is known to drive commercial piles into the ground, these being piles constructed of steel cylinders or solid concrete and having diameters of about 3 to 16 inches. Such piles are normally driven by a dynamic impact of a dead weight or drive hammer applied at the top of the pile. A problem with the prior art pile drivers using dead weights is that these are very heavy weights and they are slow to be retracted along the boom to an upper position whereby to be released onto the top end of the pile with sufficient force to drive the pile into the ground. Such rigs create very large vibrations in the ground and can affect the foundations of adjacent building structures. They can often damage the top end of the pile although an impact block is usually supported on top of the pile but the weight is often not equally distributed about the pile. Such apparatuses are also very noisy.
Another disadvantage of the above pile driving rigs using dead weights is that cranes are required to lift these weights and these cranes are fairly large and are not easily maneuverable, particularly in tight spaces and form this reason these rigs cannot be used when there is insufficient access to a space in which piles are to be drive. These pile driving rigs are very dangerous as the dead weights usually weigh in the area of 7,000 pounds. A disadvantage of such rigs is that there is often cable breakage or breakage of the guide slide of the boom due to the dropping forces created by these heavy impacting dead weights.
A still further disadvantage is that the piles need to have a diameter of at least 7 inches to resist to these high impact blows and therefore such rigs are not utilized for driving smaller diameter piles for supporting foundations of houses or buildings as the blows of these dead weights would break the piles.
SUMMARY OF INVENTION
It is a feature of the present invention to provide a casing assembly for securing a hydraulic breaker hammer for use as a pile driver and which substantially overcomes all of the above-mentioned disadvantages of the prior art.
Another feature of the present invention is to provide a hydraulic breaker hammer casing assembly using a hydraulic breaker hammer for pile driving and wherein the hydraulic breaker hammer is easily installed in the casing and wherein the casing also protects the breaker hammer and its associated hardware.
Another feature of the present invention is to provide a hydraulic breaker hammer casing assembly for pile driving and wherein the breaker hammer is protected by the casing and immovably secured therein and further wherein the casing has a pile guiding assembly secured at an open bottom end thereof to receive the top end portion of a pile therein wherein the impacting working implement of the breaker hammer is maintained axially aligned with the pile.
Another feature of the present invention is to provide a hydraulic breaker hammer casing assembly for pile driving and wherein the pile guiding assembly is adjustable and interchangeable to adapt to piles of different diameters.
Another feature of the present invention is to provide a hydraulic breaker hammer casing assembly for pile driving and wherein the casing assembly is adapted for securement to existing booms of pile driving rigs.
Another feature of the present invention is to provide a hydraulic breaker hammer casing assembly which can be quick-connected on a support carriage displaceable along the boom of a pile driving rig and wherein a downward pulling force may be applied to the casing assembly.
Another feature of the present invention is to provide a hydraulic breaker hammer assembly having an integrated winch for positioning piles thereunder.
Another feature of the present invention is to provide a hydraulic breaker hammer casing assembly for pile driving and which utilizes a blunt working implement and wherein the hammer has fewer parts and therefore requiring fewer and easy repair.
Another feature of the present invention is to provide a hydraulic breaker hammer casing assembly for pile driving and wherein the hydraulic breaker hammer provides approximately 350 blows per minute and wherein the coupling between the blunt working implement and the breaker hammer is more rigid and therefore can better handle lateral loads during operation.
Another feature of the present invention is to provide a hydraulic breaker hammer casing assembly wherein the impacting blows are transmitted to the top of the pile through a blow damping drive cap having a fluid chamber and fluid pressure monitoring means to measure the impact force of the blows and through fluid pressure monitoring means determining the hardness of the ground by measuring the resistant force of the pile which provides a means to determine when a pile has reached a substrata to provide the required support, such as the bed rock.
A still further feature of the present invention is to provide a quick interlocking means between the hydraulic breaker hammer casing assembly to a slide plate or carriage displaceable along a boom whereby the hydraulic breaker hammer housing can be quickly coupled and uncoupled to the boom.
According to the above features, from a broad aspect, the present invention provides a hydraulic breaker hammer casing assembly for converting a hydraulic breaker hammer to a pile driving apparatus. The casing assembly comprises a support housing having breaker hammer securing means adapted for immovably securing therein a hydraulic breaker hammer. The support housing has protective side walls. One of the protective side walls has attachment means for connection to a support member displaceable along a boom of a pile driving rig. An impact shaft of the hydraulic support hammer is positioned near a bottom end of the support housing. A pile guide means is secured at the open bottom end of the support housing for guiding, in axial alignment with the impact shaft, a pile to be driven in a soil surface.
According to a still further broad aspect of the present invention there is provided an adjustable pile guide housing for displaceable securement under a drive cap seated on a top end of a pile and impacted by a pile driver. The adjustable pile guide housing is a rectangular open-ended housing having opposed top and bottom flat walls and a pair of parallel side walls. A large opening is provided in the top and bottom flat walls and aligned with one another and dimensioned for the passage of a top end portion of a pile to be received therethrough. A pair of slide guide blocks is retained captive in the open-ended housing by obstruction means secured to the open-ended housing and obstructing the open end of the housing. Adjustable securement means is provided for securing the slide guide blocks at predetermined locations on a respective side of the pile guide housing. The slide guide blocks have a shaped formation in an inner wall thereof facing one another on opposed sides of the large opening.
According to a still further broad aspect of the present invention there is provided a blow damping drive cap in combination with a pile driving hammer for transmitting impact forces from the pile driving hammer. The drive cap has a fluid chamber and a fluid conduit leading to the fluid chamber. Fluid pressure monitoring means is secured to the fluid conduit to measure the impact force of the impact blows transmitted to the pile in relation to the hardness of the ground in which the pile is driven. The fluid pressure monitoring means determines the hardness of the ground by the measured resistance force of the pile.
BRIEF DESCRIPTION OF DRAWINGS
A preferred embodiment of the present invention will now be described with reference to the accompanying drawings in which:
FIG. 1 is a perspective view illustrating the hydraulic breaker hammer casing assembly;
FIG. 2 is an exploded perspective view showing how the hydraulic breaker hammer is secured in the support housing;
FIG. 3 is an exploded perspective view showing the construction of the housing with the front wall having been removed;
FIG. 4 is an exploded rear perspective view of FIG. 3;
FIG. 5 is an exploded perspective view showing the hydraulic hammer casing assembly including the pile guiding assembly secured to the lower end of the casing assembly;
FIG. 6 is a perspective view of the pile guiding assembly;
FIG. 7 is an exploded perspective view of the pile guiding assembly;
FIG. 8 is a rear perspective view of the pile guiding assembly and illustrating the slide guide blocks in a completely closed position;
FIG. 9A is a further embodiment of the hydraulic breaker hammer casing assembly and wherein a protective space is defined by the side walls of the support housing to accommodate hydraulic and electrical lines and wherein these lines are quickly connectable and disconnectable from the breaker hammer assembly;
FIG. 9B is an exploded view of the hydraulic breaker casing assembly of FIG. 9A;
FIG. 10 is an enlarged view illustrating the construction of the connecting block for connecting and disconnecting the hydraulic and electrical conduits as well as illustrating the securement of a pile guide member at the bottom of the housing and a winch hook to attach to piles to be positioned under the casing;
FIG. 11A is a further bottom side view of the further embodiment of the hydraulic breaker hammer casing assembly showing its connection to a slide plate for quick connection and disconnection to a boom of a pile driving rig;
FIG. 11B is a view similar to FIG. 11A but seen from a different angle;
FIG. 12 is an enlarged perspective view of the configuration of the quick connectors of the support housing and the slide plate, namely the connecting cavities and the tongue formations;
FIG. 13 is a perspective view illustrating the support housing secured to a boom of a pile driving rig for sliding displacement therealong;
FIG. 14 is an exploded view showing the removable interconnection of the pile guides to the bottom open end of the support housing and herein illustrating two different types of pile guides;
FIG. 15 is a top perspective view of the hydraulic breaker hammer casing assembly illustrating again the sliding interconnection of the housing with the boom and wherein the casing assembly can be displaced above the top end of the boom and further illustrating some component parts of the pile winch assembly;
FIG. 16A is a section view showing the construction of the blow damping drive cap and the blunt end of the impact shaft of the hydraulic breaker hammer in relation thereto;
FIG. 16B is an enlarged view of the blow damping drive cap showing its construction to a pressure monitoring controller device;
FIG. 17A is a simplified side view showing the hydraulic breaker hammer casing assembly supported on a boom by a winch and pulleys secured to the top end of the support housing;
FIG. 17B is a perspective view showing the hydraulic breaker hammer casing assembly secured to the boom of a pile driving rig by means of a chain drive wherein a downward force may be applied to the support housing by the chain drive to assist in the downward driving force of the hydraulic breaker hammer;
FIG. 18A is a simplified side view showing the top position of the support housing when slidingly displaceable along the boom by a chain or cable drive and wherein the housing exceeds the top end of the boom thereby permitting the booms to be constructed shorter or providing for the positioning of longer piles under the hydraulic breaker hammer casing assembly; and
FIG. 18B is an enlarged view showing the top end of the casing assembly when slidingly connected to the boom and displaceable by a chain drive.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to the drawings and more particularly to FIGS. 1 to 5, there is shown generally at 10 an embodiment of the hydraulic breaker hammer casing assembly of the present invention. The casing assembly 10 comprises a support housing 11 which is adapted for immovably securing therein a hydraulic breaker hammer 12 as shown in FIG. 2. The hydraulic breaker hammer is of the type used on backhoes to break concrete wherein the working implement is of large diameter of at least one inch. The support housing has a rear support wall 13, opposed lateral side walls 14 and 14′ and a front wall 15. A door 16 is provided at the top end of the front wall for access to the interior of the support housing 11.
As shown more clearly in FIGS. 2 to 4, a plurality of connecting rods 16 are secured at predetermined positions between the opposed lateral side walls 14 and 14′ for clampingly securing the hydraulic breaker hammer 12 in the support housing 11. The connecting rods 16 are threaded at both ends 16′ and adjustably secured by nuts 16″. At least some of these connecting rods 16, such as rod 16′ are disposed in close contact in transverse recess areas of the hydraulic breaker hammer 12, such as recess areas 17, for preventing axial displacement of the hydraulic breaker hammer 12 in the support housing 11. Connecting rods 16 could also be secured between the front and rear wall of the housing.
As shown in FIGS. 2 and 5, the hydraulic breaker hammer 12 is fitted with a blunt steel working implement 18 which has a large flared end section 19 which has a convex outer surface 20 for delivering impacts to a drive cap 21 (see FIG. 7) guidingly received in a pile guiding assembly 22 secured at an open bottom end 23 of the support housing 11 for guiding, in axial alignment with the working implement 18 a pile 24 (see FIG. 1) to be driven into the soil. The drive cap 21 has a concave upper surface.
As shown in FIGS. 2 to 5, some of the connecting rods 16 are provided, in at least major sections thereof, with a sleeve 25 of compressible material, such as rubber, to protect the rods from direct frictional contact with the hydraulic breaker hammer and these sleeves 25 dampen vibrations between the hammer and the frame and reduce noise. As more clearly illustrated in FIGS. 3 and 4, the rear support wall is provided with attachment means for securing the casing assembly 10 to a pile driving apparatus, not shown but obvious to a person skilled in the art. The attachment means is herein constituted by slide engaging sleeves 30 secured to an outer surface 29 of the rear support wall 13 for sliding engagement with a carriage of a mast of a pile driving apparatus. Connection means in the form of a series of holes 31 are provided in the rear support wall 13 to provide adjustable attachment connections of the breaker hammer casing assembly on a mast.
As illustrated in FIGS. 2 to 4, recess engaging plates 32 are also secured to connecting rods, herein connecting rod 16′″ whereby to dispose these recess engaging plates 32 in transverse recess areas such as area 33, as shown in FIG. 5, of the hydraulic breaker hammer 12 and extending between the front wall 15 and the rear support wall 13. These rods 16′″ also have threaded ends and extend in close sliding fit through holes 34 provided in the transverse recess engaging plates 32, herein a front transverse arm 35 thereof, and are secured by nuts 16″.
With reference now to FIGS. 6 to 8, there will be described the construction and operation of the pile guiding assembly 22. The pile guiding assembly comprises an attachment cylinder 35 which is herein shown as a square cross-section steel cylinder provided with holes 36 spaced apart along its outer rear periphery for securement to an attachment means in the form of a square bracket 37 secured about the bottom end of the hydraulic breaker hammer 12 or to the bottom end of the support housing 11 and supporting the pile guiding assembly in position to align the top end of a pile, such as the pile 24 shown in FIG. 1, axially with the longitudinal axis of the hammer and the working implement 18. A drive cap 21 is disposed in sliding fit in the attachment cylinder 35 (see FIG. 7) and extends transversely therein. The drive cap 21 is in the shape of a square block and it has a top concave surface (not shown) to receive therein the convex end 20 of the working implement 18 (see FIG. 5) whereby to transfer impact blows to the circumferential top end 24′ of the pile cylinder 24 to be driven into the soil (see FIG. 1). The drive cap 21 ensures perfect sitting on the top end 24′ of the pile.
An adjustable pile guide housing 38 is secured adjacent the front open end 39 of the attachment cylinder 35 and therefore is secured to the support housing 11 for seating engagement about the top end portion of the pile 24 whereby to orient the hydraulic breaker hammer support housing axially aligned with the pile and with the anvil sitting on the top end of the pile as mentioned above. The square bracket 37 is provided with holes 37′ for receiving fasteners for connection with the holes 36 in the attachment cylinder whereas the adjustable pile guide housing 38 is fitted with a projecting flange 40 secured along a lower edge thereof for connection with a connecting flange 41 secured to the bottom end of the rear support wall 13 of the support housing 11.
The adjustable pile guide housing 38 is a rectangular open-ended housing having opposed top and bottom flat walls 42 and 43, respectively, and a pair of parallel transverse or side walls 44 and 44′. Large openings 45 and 45′, herein of circular shape and greater than the largest diameter pile to be received therein, are provided in the top and bottom flat walls 42 and 43, respectively. These large openings are aligned with one another. A pair of slide guide blocks 46 and 46′ is retained captive in the open-ended housing 38 and slidable therein. As hereinshown, the guide blocks 46 and 46′ have shaped inner walls, herein an arcuate shaped formation in inner walls 48 and 48′ thereof and disposed in facial relationship to one another on opposed sides of the large openings 45 and 45′. The inner wall 48 has a width sufficiently large for retention contact with the opposed outer arcuate surfaces of a pile received therebetween whereby to maintain good facial contact therewith to align the hydraulic breaker hammer casing assembly axially with the pile. These guide blocks 46 and 46′ are retained captive within the housing 38 by end walls 50 and 50′ secured over the open ends 51 and 51′ of the housing 38. Brackets 52 and 52′ provide attachment of the end walls 50 and 50′ to the top and bottom walls 42 and 43. As shown, the end walls are also provided with a central hole 55 to provide access to the rear flat wall 46″ of the guide blocks disposed adjacent thereof whereby a rod can be positioned therein to move the guide blocks for adjusting their position or for dislodging them if the are arrested by debris, such as dirt, infiltrated in the housing 38.
The guide blocks 46 and 46′ are adjustably secured within the housing 38 by means of two or more rows of aligned holes, herein rows 56 and 56′ which are provided in both the side walls 44 and 44′ and aligned with one another. The guide blocks are also provided with through bores 57 extending across the slide guide blocks and disposed for alignment with selected ones of the two or more holes in the rows of holes 56 and 56′ in adjacent ones of the rows. Connecting rods 58 are disposed in selected ones of the holes and the aligned through bores 57 for securing the slide guide blocks at a predetermined location for guided contact with the outer side wall of a pile to be received in the adjusting pile guide housing 38.
As shown in FIG. 7, the connecting rods 58 are provided as a pair of connecting rods interconnected in parallel relationship at an end thereof with a handle 59 formed at the connected end for ease of inserting and withdrawing the connecting rods from the selected ones of pair of holes 56 and through bores 57.
FIG. 8 illustrates the slide guide blocks 46 and 46′ positioned and secured at their innermost positions whereby to guidingly position a small diameter pile as herein identified by phantom lines 60.
Although the pile guiding housing 38 herein illustrated is for guiding pile tubes of circular cross-section, they may be configured to guide piles of different cross-sections, such as square cross-sections. Therefore, the openings 45 and 45′ would be square and the inner walls 48 and 48′ of the guide blocks 46 and 46′ would be straight inner walls.
Referring now to FIGS. 9A and 9B, there is shown a further embodiment of the hydraulic breaker hammer casing assembly herein denoted by reference numeral 65. As hereinshown the housing assembly comprises protective side walls for housing the hydraulic breaker hammer 12 and suitable retention means is provided for maintaining the hydraulic breaker hammer 12 immovable therein and such retention means may be similar to that as described in relation to FIGS. 3 and 4 and including such retention means as the recess engaging plates 32. As hereinshown, the protective side walls are substantially flat rectangular plates with one of the side walls 66′ constituting a rear side wall having attachment means for connection to the boom 64 of a pile driving rig 63 as schematically illustrated in FIG. 17A. A side wall 66″ is herein shown spaced from the hydraulic breaker hammer 12 whereby to create a protective space on a side of the hydraulic breaker hammer to accommodate hydraulic and electrical lines 68 therein. These hydraulic and electrical lines 68 are connected to a connection block 69 connected to a lower side section of the support housing. Connector mechanisms actuated by a connecting arm 70 quick-connect an disconnect the internal hydraulic lines and electrical wires 68 to external flexible supply conduits 71 in which the hydraulic lines and electrical lines or other lines are housed for interconnection with the internal hydraulic and electrical supply lines 68.
As hereinshown with additional reference to FIG. 10, the support housing also has a top wall 71 with a cable winch assembly 72 mounted thereon. The winch assembly comprises a motor 73 which drives a spool 74 on which a steel wire 75 is stored. The steel wire 75 is guided on a pulley 76 and extends downwardly into the protective space 67 and is guided at a bottom end in a guide bracket 77. A hook 78 is secured to the free end of the cable 75. This cable winch assembly is provided whereby the cable 75 may be attached to a pile top end portion lying on the ground for lifting the pile and guiding the top end portion of the pile under the open bottom end 78 of the housing by displacing the support housing upwardly along the boom to draw the top end of the pile in position under the open bottom end of the casing. Accordingly, there is no need for other equipment to position the piles under the housing.
With reference now to FIGS. 11A to 13, there will be described the attachment means for securing the support housing 75 to the boom 64 of a pile driving rig. As hereinshown, the attachment means is constituted by a slide plate 80 which has two or more aligned first connecting members herein constituted by seating blocks 81, as better seen in FIG. 12, three of which are axially aligned on the slide plate 80, and second axially aligned connecting members secured or formed in the rear side wall 66′ of the support housing 65. The second connecting members are constituted by spaced-apart connecting cavities 82, three of which are provided on the rear wall 66′ of the housing and disposed axially aligned and spaced-apart whereby to receive therein the first connecting members for inter-engagement therein wherein the flat surface 66′″ of the rear wall 66′ of the housing will sit flush on the outer flat wall 80′ of the slide plate 80.
As shown in FIG. 12, each of the seating blocks 81 has a tongue formation 83 extending outwardly at a top end thereof. The connecting cavities 82 are provided in a top edge thereof with a tongue engaging formation 84 for seating engagement on the tongue formation 83 of an associated one of the seating blocks 81. The tongue formation 83 of the seating block has an angulated flat slide ramp section 85 which extends form a free outer edge 86 to the flat surface 80′ of the slide plate. It is also provided with opposed slope side edges 87 which extend angularly inwards from the flat surface 80′ to the free outer edge 86 of the tongue. The tongue formations guide the seating blocks 81 for inter-engagement with their associated connecting cavities 82. As also better shown in FIG. 12, the tongue engaging formation 84 of the connecting cavities is constituted by an inward upwardly sloping seating wall 88 for sliding engagement on the flat slide ramp 85 of the tongue formation 83 of its associated seating blocks. It also has opposed angularly and inwardly sloping guide edges 89 which extend from opposed edges of the connecting cavities to the seating wall 88. Accordingly, when the seating blocks 81 are disposed within the connecting cavities 82, the tongue formations will pull in the rear wall 66′ of the support housing 65 as the housing is lowered on the slide plate 80.
The slide plate 80, as better shown in FIG. 11A, is provided with boom engaging guide means in the form of rearwardly extending slide arms 90 extending from opposed side edges 80″ of the slide plate whereby to retain the slide plate in sliding captive engagement with opposed rails 91 of the boom 64, as shown in FIG. 13. Accordingly, the support housing is slidingly retained and displaceable upwardly and downwardly along the boom by a displacing means in the form of a cable or chain drive as will be described later. In order to prevent the slide plate 80 from being disconnected from the support housing 65, a transverse slot 92 is formed in the flat surface 80′ of the slide plate 80, and a flat rectangular slide plate 93 is guidingly disposed in captive retention between guide brackets 94 formed on opposed sides of the rear wall 66′ of the housing whereby the flat lock bar 93 may be disposed in interlocking slide fit with the transverse slot 92 to prevent disengagement of the tongue engaging formations within the connecting cavities by preventing axial displacement between the slide plate 80 and the rear wall 66 of the housing.
It is pointed out that at least one of the side walls 66 of the housing is a removable side wall to provide access to the hydraulic breaker hammer and the protective space to provide for maintenance to the casing assembly and the hydraulic breaker hammer. The protective housing also protects the assembly and the hydraulic breaker hammer from foreign elements and adverse climatic conditions such as rain and snow. Further, as shown in FIG. 17B, the top wall of the housing may be provided with a further protective housing 95 to protect the winch assembly 72 therein. That further protective housing 95 may also be provided with an attachment 96 secured to a top wall 95′ of the housing 95 whereby a winch cable 97 (see FIG. 17A) of a motor driven winch 98 may be secured. As shown in FIG. 17A, the motor driven winch 98 is mounted at a top end 99 of the boom 64 whereby to position the breaker hammer casing assembly 65 at a top end of the boom with a pile 100 positioned thereunder to be driven into the ground surface 101 by impact blows generated by the hydraulic breaker hammer and the total weight of the hydraulic breaker hammer casing assembly.
With further reference to FIGS. 17B, 18A and 18B, there is illustrated the hydraulic breaker hammer casing assembly 65 secured to a drive attachment tether herein constituted by a link chain 102 guided by sprockets and a drive motor whereby to impart an upward pulling force and a downward pulling force on the housing 65 to position the pile driving assembly 65 at a top end of the pile to be driven into the soil surface and to provide a downward pulling force on the hydraulic breaker hammer casing assembly 65 when the hydraulic breaker hammer generates impact blows whereby to provide additional driving force at the top end of the pile as shown in FIG. 11A. Slide plate 80 is provided with U-shaped hooks 104 at opposed ends thereof whereby the link chain 102 may be secured thereto. Other securement means may also be provided to secure the slide plate to the link chain 102. As can be seen from FIGS. 15 and 18A, with this type of attachment means the hammer casing assembly 65 may be drawn to the top end of the boom 64 with the housing partly projecting over the top end of the boom and this provides for the booms to be constructed of shorter length to accommodate piles of standard size or may also provide for the driving of longer pile lengths with the same boom length.
Referring now to FIG. 14 and additionally to FIG. 10 and FIGS. 11A and 11B, there will be described the detachable attachment of the pile guides 38 and 105 to the bottom open end 79 of the housing 85. As hereinshown the adjustable pile guide housing 38 is provided with a pair of parallel guide flanges 106 secured on a top surface of its support frame for removable engagement with the pair of guide flanges 107 projecting from a lower surface of the support housing for guiding sliding engagement therewith. As shown in FIG. 14, there are two types of pile guides and other types are envisaged for guiding piles of different configurations under the open end 79 of the support housing 65. Flat corrugated retention piles can also be adapted.
The pile guide 105 comprises a support frame 108 provided with a pair of parallel guide flanges 109 secured on a top surface of the support frame 108 for removable engagement with the slide flanges 107 of the support housing 65. A pile passage 110 is defined between the pair of guide flanges 109 and configured to receive a pile in close sliding fit therein. A plurality of depending guide fingers 111 are secured to a lower surface of the support frame 108 and spaced-apart about the pile passage 110. The finger members 111 have an inner angulated guide edge 112 sloping outwardly from about the pile passage 110 to an outer end thereof to create an enlarged guide opening to capture a top end portion of a pile to guide it into the pile passage 110. These fingers 111 constitute a pile guide means. As shown in FIG. 10, a connecting pin 113 retains the pile guides secured about the open bottom end of the casing 65. Other connecting means are also envisaged. As shown in FIG. 14, the connecting pin 113 extends through a connecting opening 114 formed in each of the slide flanges 107 and extend in front of the guide flanges 106 which as shown in the slide guide 104 is recessed from a front edge 108′ of the frame 108.
With reference now to FIGS. 16A and 16B, there is shown the construction of the drive cap 21 herein designated by reference numeral 21′. The drive cap 21′ is guidingly retained in a bottom end of the support housing 65 above the pile guiding assembly secured thereunder. The drive cap 21′ has a top surface 120 provided with a cavity 121 shaped to receive the blunt steel working implement 18 with its flared end section 19. The drive cap 21′ is a damping drive cap having an elastomeric material layer 122 secured therein to damper the impact blows of the working implement 18 whereby to dampen the blows and reduce noise. The drive cap 21′ is also provided with a fluid chamber 123 to encapsulate therein a fluid. A fluid conduit 124 leads from the fluid chamber 123 to a coupling 125 secured to the side wall 126 of the drive cap 21′. A computer controller assembly 127 is secured to the connector 125 and provided with pressure sensing means in the form of a pressure gauge 128 to measure the pressure of the fluid 130 captive within the chamber 123 whereby to measure the impact force of the impact blows transmitted to the fluid and the pile in relation to the hardness of the soil in which the pile is driven. This computer controller or pressure monitoring means determines the hardness of the soil by measuring the resistance force of the pile as impact blows are generated on the drive cap 21′ whereby to sense when the pile has reached a bedrock or a proper support strata within the ground.
It is within the ambit of the present invention to cover any obvious modifications of the preferred embodiment described herein, provided such modifications fall within the scope of the appended claims.
Patent Application
20140262393
