Method of constructing a building in a typically flood prone area employing a pre-cast concrete chain wall

Abstract

A method of constructing a building in a typically flood prone area employs a pre-cast concrete chain wall that can be set on an optional foundation or footing.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable

REFERENCE TO A “MICROFICHE APPENDIX”

Not applicable

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a method of erecting a building or like structure wherein a pre-cast concrete chain wall is first constructed and then transported to a selected building site. Even more particularly, the present invention relates to an improved method of elevating a building or other structure or equipment at a lower cost and/or reduced construction time.

2. General Background of the Invention

Cast-in-place concrete chain walls are typically used to elevate buildings in flood prone areas. One of the most common usages of the chain walls are for prefabricated modular buildings used by telecommunications or other communication companies.

Each individual company normally uses a standard size building. Thus the footprint of the chain wall is normally constant. The time and construction cost for building a cast-in-place chain wall at a particular site can be extremely expensive and time consuming.

After the concrete is poured, the concrete must be allowed time to cure. The wooden forms used for cast-in-place chain walls are then removed and typically disposed of. This entire process could range from 2-4 weeks (even longer if there are delays in obtaining materials or due to weather). There are known cases in which the wooden forms have failed and the final walls are bowed out of alignment. The concrete must be delivered to the site from a concrete plant which could be several miles from the site location. The compressive strength of the cast-in-place concrete chain wall is usually determined 28 days after the concrete is poured.

The present invention provides an improved method of installing an elevated building at a particular location and in a shorter time frame. The present cast-in-place method usually requires a contractor to order wooden forms, steel reinforcing bars, concrete trucks to pour, labor to form and pour the cast-in-place chain wall, and possible pump trucks and matting.

The present invention has many advantages over the current cast-in-place type systems. The pre-cast chain wall can be poured and stored in a storage facility months prior to the beginning of a job. The forms used for the pre-cast chain wall system can be metal, which can be used many times. The concrete can be poured in ideal weather conditions and is usually supplied by an on-site concrete manufacturer. The metal forms can be specifically tooled to accept attachments for landing, tie-down plates or other attachments which are typically required by the client.

These metal forms can be built with vertical grooves or any other type of decorative pattern to make the finished product more aesthetically pleasing than the present cast-in-place chain wall.

The exterior walls for the pre-cast chain wall can be smoother and contain little to no honeycomb finishes as compared to the cast-in-place chain wall. The steel reinforcement could be ordered in large quantities and shipped to the fabrication plant. The cast-in-place concrete chain walls can be poured in one day, and then set aside for curing. The fabrication plant can stockpile these pre-cast chain walls and deliver them as needed.

When a client orders a pre-cast concrete chain wall, he will know the compression strength of his new concrete wall before it is delivered to his site. The construction time for placing a pre-cast chain wall on site can be reduced from 2-4 weeks to a week or even a day.

As with a standard cast-in-place chain wall, a foundation is needed in some cases to support the wall and building. If for example, pilings are required to support the wall and building, the pilings could be driven to a certain elevation, and then the pre-cast chain wall can be placed on top of the piles, followed by the new prefabricated modular building.

A crane large enough to place the prefabricated modular building can first be used to set the lighter pre-cast concrete chain wall in place on top of the piles. The modular building can be attached to the chain wall using tie-down plates with bolts. The pre-cast chain walls can be made such that the tie-down bolts can double as attachments for lifting the wall.

A typical size (approximate dimensions) of a chain wall is 11 feet 6 inches×20 feet×4 feet high with wall thickness of 10 inches. These dimensions will vary based on the client's need and the building or structure loads.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein:

FIG. 1 is a schematic diagram illustrating method steps for forming the pre-cast concrete chain wall of the present invention;

FIG. 2 is a schematic diagram illustrating a lifting of the pre-cast concrete chain wall of the present invention with lifting cables and placing it upon an optional piling foundation;

FIG. 3 is a schematic perspective view illustrating placement of the pre-cast concrete chain wall of the present invention upon an optional concrete footing foundation;

FIG. 4 is a schematic diagram of the preferred method of the present invention showing the pre-cast concrete chain wall placed upon a piling foundation and with tie down plates in position;

FIG. 5 is a perspective schematic view illustrating the use of tie down plates for holding the pre-cast concrete chain wall of the present invention to a foundation of concrete footings;

FIG. 6 is a perspective view illustrating placement of a building or like structure upon the pre-cast concrete chain wall of the present invention when support with an optional piling foundation;

FIG. 7 is a perspective view of a first embodiment of the apparatus of the present invention;

FIG. 8 is a partial perspective view of a second embodiment of the apparatus of the present invention;

FIG. 9 is a plan view of the second embodiment of the apparatus of the present invention;

FIG. 10 is a partial perspective side view of the second embodiment of the apparatus of the present invention;

FIG. 11 is a fragmentary elevation view of the second embodiment of the apparatus of the present invention;

FIG. 12 is a sectional view taken along lines 12-12 of FIG. 8;

FIG. 13 is a sectional view taken along lines 13-13 of FIG. 8;

FIG. 14 is a sectional view taken along lines 14-14 of FIG. 8;

FIG. 15 is a fragmentary view illustrating part of the method of the present invention, preparing foundation;

FIG. 16 is a perspective view showing another step of the method of the present invention, lifting chain wall;

FIG. 17 is a perspective view showing another method step of the present invention, placing chain wall on prepared foundation;

FIG. 18 is a perspective view showing another method step of the present invention, lifting building;

FIG. 19 is a perspective view showing another method step of the present invention, placing building on chain wall;

FIG. 20 is a schematic diagram illustrating the optional pre-cast chain wall to piling tie-down detail.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 illustrates the sequence of manufacturing a finished pre-cast concrete chain wall, designated generally by the numeral 6 in FIG. 1. In order to form the finished pre-cast concrete chain wall of FIG. 1 that is designated generally by the numeral 6, a user starts with a form 1 of metal, wood, or the like, that is fitted with a steel reinforcing cage 2 or like reinforcing. An optional louver 3 can be placed in form 1 for providing access under a featured building or for allowing water flow. Inserts 4 can be provided to accept bolts or tie downs, a landing, stairs, or the like. The arrow 5 in FIG. 1 illustrates the pouring of any selected (e.g. commercially available) slurried concrete into the form 1. FIG. 1 also shows the finished pre-cast chain wall product number 6 after removal from the form 1.

In FIGS. 2 and 3, the pre-cast concrete chain wall 6 has been rigged with lifting cables 7, such rigging in combination with a lifting device (e.g. crane) is used to set the chain wall 6. Cables 7 can be rigged to building 12 or other selected structure such as a generator or prefabricated cabinet (see FIGS. 6 and 7). Once the cables 7 are used to set the pre-cast concrete chain wall 6, a selected structure 12 such as a modular building is placed upon the chain wall 6 as shown in FIG. 6.

The completed combination of building 12, pre-cast concrete chain wall 6, and optional foundation 8 or 9 can be seen in FIG. 7. Tie down plates 10 can be used to secure the building 12 to the pre-cast concrete chain wall 6. Similar tie down plates 10 can be used to secure the chain wall to the optional foundation 8 or 9.

FIGS. 8-20 show a second embodiment of the apparatus of the present invention designated generally by the numeral 54 in FIG. 19. Second embodiment 54 includes a prefabricated building 48 and a pre-cast chain wall foundation 15. Prefabricated building as used herein includes prefabricated cabinets and generators. Both are transported to a building site 16, each using a transport vehicle 39. In FIGS. 8-14, pre-cast chain wall foundation 15 has an upper end portion 23 and a lower end portion 22. At about the time that the transport vehicle 39 transports pre-cast chain wall foundation 15 to building site 16, a trench or excavation 18 is prepared at building site 16 so that the excavation or trench 18 can receive pre-cast chain wall foundation 15 in a leveled position.

In FIG. 15, an excavator 17 having a bucket or other digging implement 19 is shown digging an excavation 18 or trench. In FIG. 20, the excavation or trench 18 preferably provides a bottom 21 that is level or horizontal. The trench or excavation 18 can also provide one or more sidewalls 20.

Pre-cast chain wall foundation 15 can include a number of columns 24-28. These columns include corner columns 24 and intermediate columns 25, 26, 27, 28 as shown in FIG. 8. The upper end portion 23 of pre-cast chain wall foundation 15 provides a plurality of upper beams 30 and a plurality of lower beams 33. Each of the columns 24-28 extends between an upper beam 30 and a lower beam 33 as shown.

The upper beam 30 can include longitudinal reinforcing bars 31 or rebars and spaced stirrups 32. In FIG. 13, the lower beam or foundation beam 33 includes longitudinally extending reinforcing bars or rebars 34 and laterally spaced apart stirrups 35. Likewise, each column 24-28 can be provided with vertical reinforcing bars or rebars 36 and vertically spaced apart stirrups 37.

The upper beam 30 can include optional notches 29 as shown in FIG. 8 to be used for support beams (e.g. wide flanged beams, I-beams, channel beams, etc.) for possible walkways, equipment such as generators and outside cabinets, or prefabricated building requiring additional support.

One or more plastic tubing sections 38 is provided at numerous locations on pre-cast chain wall foundation such as for example at the lower end portion of a column 24-28 as shown in FIG. 11. Each plastic tubing 38 can be a bore or passageway that extends through the pre-cast chain wall foundation 15 for enabling a steel cable or other connective strap to be inserted for optionally forming a tie between pre-cast chain wall foundation 15 and each of a number of piling 50 (see FIG. 20).

When the pre-cast chain wall foundation 15 is transported to building site 16 using transport vehicle 39, a lifting device 40 or like mechanism is employed to transfer pre-cast chain wall foundation 15 from transport vehicle 39 to the trench or excavation 18 at building site 16. FIG. 16 illustrates a lifting of pre-cast chain wall foundation 15 with a truck crane 40 or other lifting device having a boom 41 and lifting line or crane line 42. Rigging 43 can be employed to form an interface between the crane or lifting line 42 and pre-cast chain wall foundation 15. Such rigging 43 can include a plurality of slings 44 that are wrapped around the upper end portion 23 of pre-cast chain wall foundation 15 as shown in FIG. 16.

In FIG. 17, lifting device 40 has placed pre-cast chain wall foundation 15 in trench or excavation 18 wherein pre-cast chain wall foundation rests upon the bottom 21 of excavation or trench 18.

A prefabricated building 48 or other building can be transported to building site 16 using a transport vehicle 39. A lifting device such as truck crane 40 or other device can be used to transfer building 48 to pre-cast chain wall foundation 15. In FIG. 18, the lifting line 42 interfaces with rigging 45 that can include slings 46 and optional spreader bars 47. In FIGS. 19-20, pre-cast chain wall foundation 15 extends below the earth's surface 49 and rests upon the bottom 21 of excavation or trench 18.

A plurality of piling such as treated timber piles 50 can optionally be used as part of a tie-down arrangement as shown in FIG. 20. As used herein, piling includes any known installed piling such as but not limited to footings, concrete or timber piling, screw piling, cast in place concrete pile, composite pile, or the like. In FIG. 20, a pile 50 such as a treated timber pile is driven a partial distance into the earth and below earth's surface 49. The pile 50 is then cut if required to provide a level surface, and can be a treated pile, if necessary.

An opening or channel 51 is formed through the upper end portion of pile 50. A galvanized wire rope 52 or other tie is inserted through channel or opening 51 leaving end portions 55 of galvanized wire rope or tie 52 exposed so that a tie can be formed between the end portions 55 and pre-cast chain wall foundation 15. Pile 50 is then driven a further distance into the earth until its upper end is about even with the elevation of the bottom 21 of trench or excavation 18. Shims can be placed on each pile 50 as needed. The trench or excavation 18 is then preferably widened for enabling a user to form a connection between end portions 55 and chain wall foundation 15. The enlarged excavation 53 is simply an enlargement of the trench or excavation 18 at each pile location. The wire rope 52 is then threaded through plastic tubing 38 or channel formed through pre-cast chain wall foundation 15. The wire rope 52 is then clamped or fastened together to form a tie between each piling 50 and pre-cast chain wall foundation 15, each can be at a position below a column 24-28.

The present invention provides an improved business method that enables a contractor or vendor to offer a pre-cast building to a customer for delivery in a very short period of time. Because the pre-cast chain wall foundation 15 is a pre-cast prefabricated structure, it can be transported to a job site in a very short period of time such as for example in less than a week or in less than a day. Similarly, building 48 can be a prefabricated building that can be transported using a transport vehicle 39. The building 48 can be transported in a short period of time such as in less than a week or in less than a day to a selected job site or building site 16. Using the business method of the present invention, the customer can be offered a building 48 and foundation 15 than can be erected in less than a week or even less than a day. Such a customer can also be offered a pre-cast chain wall foundation 15 that is already constructed and available for inspection before it is ever installed.

The following is a list of parts and materials suitable for use in the present invention.

PARTS LIST
Part Number Description
1           metal form for new pre-cast
            concrete chain wall
2           steel reinforcing cage
3           optional louver to provide access
            under future building, or allow
            water flow
4           inserts to accept bolts for tie-
            downs, landing, etc.
5           concrete to be poured into form
6           finished pre-cast chain wall
7           cables to set chain wall and
            building
8           optional piling foundation
9           optional concrete footing
            foundation
10          tie down plates
11          optional landing
12          building or other structure
15          pre-cast chain wall foundation
16          building site
17          excavator
18          trench or excavation
19          bucket
20          side wall of excavation (trench)
21          bottom of excavation (trench)
22          lower end portion
23          upper end portion
24          corner column
25          column
26          column
27          column
28          column
29          notches (5″-6″ deep)
30          upper beam
31          longitudinal reinforcing bar
32          stirrup
33          lower beam
34          longitudinal reinforcing bar
35          stirrup
36          vertical reinforcing bar
37          stirrup
38          plastic tubing or channel
39          transport vehicle
40          lifting device
41          boom
42          crane line
43          rigging
44          sling
45          rigging
46          sling
47          spreader bar
48          prefabricated building
49          earth's surface
50          treated timber pile
51          opening or channel
52          galvanized wire ropes
53          enlarged excavation
54          second embodiment of the present
            invention
55          end portion

All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, unless indicated otherwise.

The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the following claims.

Claims

1. A method of constructing a building in a flood prone location, comprising the steps of: a) selecting a building site having a surface at a grade elevation;b) constructing a self supporting, one piece liftable pre-cast concrete chain wall foundation at a location away from the building site, said constructing including the filling of a mold with reinforcement and concrete that sets after the pour and wherein the pre-cast concrete chain wall foundation has a plurality of corner columns, a plurality of intermediate columns spaced in between the corner columns, upper and lower spaced apart beams, and a plurality of openings that are surrounded by upper and lower beams and columns, wherein the beams and columns are of precast concrete construction, wherein load transfer from each beam to another is through one of said precast concrete columns and not via external fasteners;c) transporting the pre-cast concrete chain wall of step “b” to the building site of step “a” using a load carrying vehicle;d) unloading the pre-cast concrete chain wall from the load carrying vehicle;e) placing the pre-cast concrete chain wall on the building site and wherein the lower beams are at least partially below grade elevation;f) placing a building on the pre-cast concrete chain wall after step “e”, wherein the building is a walled structure having walls that rest upon and transfer load to the chain wall.

2. The method of claim 1 wherein the walled structure is constructed on the building site of step “a”.

3. The method of claim 1 wherein the walled structure is constructed away from the building site and further comprising transporting the walled structure to the building site on a load carrying vehicle.

4. The method of claims 1, 2, or 3 wherein a lifting device lifts the chain wall in step “e” and also lifts the walled enclosure in step “f”.

5. The method of claim 1 wherein the pre-cast chain wall is a one piece precast concrete structure.

6. The method of claim 5 wherein the pre-cast chain wall has a continuous outer wall joined at corners.

7. The method of claim 1 wherein the pre-cast chain wall is a multiple part structure that is assembled at or away from the building site, each part of the multiple part structure being a pre-cast concrete chain wall foundation having walls with a height and a thickness, the ratio of wall height to wall thickness for each part being equal to or greater than 3 to 1 and the wall height of each part is at least three (3) feet.

8. The method of claim 1 further comprising the step of constructing an underground foundation and in step “e” the pre-cast concrete chain wall is placed on the foundation.

9. The method of claim 8 wherein the foundation includes piling.

10. The method of claim 8 wherein the foundation includes one or more footings.

11. A method of constructing an elevated building on a building site having a surface with a grade elevation, comprising the steps of: a) excavating the earth at the building site to provide a peripheral trench that is level and below grade elevation;b) fabricating a self supporting, one piece liftable pre-cast concrete chain wall foundation at a location that is not the building site, the chain wall foundation having a multiple upper and lower beams, multiple intermediate columns, and multiple corner columns, and wherein the connection of one beam to another is a continuous precast concrete connection that includes a first beam, a corner column, and a second beam;c) transporting the pre-cast concrete chain wall foundation to the building site with a mobile vehicle;d) transporting a building having a floor, walls, ceiling and roof to the building site with a mobile vehicle;e) using a crane to lift and place the pre-cast concrete chain wall foundation in the peripheral trench of step “a”, wherein at least part of the lower beam occupies the trench below grade elevation;f) using a crane to lift and place the building upon the pre-cast concrete chain wall foundation, and wherein the building rests upon and transfers load to the chain wall.

12. The method of claim 11 further comprising the step of driving piling or deep anchoring materials in the trench and securing the pre-cast concrete chain wall foundation to the piling with tension load transfer connections.

13. The method of claim 11 wherein the pre-cast concrete chain wall foundation weighs between about 8,000 and 60,000 pounds.

14. The method of claim 11 wherein the walled structure is constructed on the building site of step “a”.

15. The method of claim 11 wherein the walled structure is constructed away from the building site and further comprising transporting the walled structure to the building site on a load carrying vehicle.

16. The method of claim 11 further comprising the step of forming an opening in at least one wall section of the pre-cast concrete chain wall structure.

17. The method of claim 16 wherein the one wall section has a wall section area and the opening has an opening area that is at least one half of the wall section area.

18. The method of claim 11 further comprising the step of forming an opening in more than one wall section of the pre-cast concrete chain wall structure.

19. The method of claim 18 wherein each wall section has a wall section area and the opening of each wall section has an opening area that is at least one half of the wall section area that has the opening.

20. The method of claim 18 further comprising the step of forming an opening in each wall section of the pre-cast concrete chain wall structure.