Civil and wooden structures

Abstract

To provide a civil engineering structure that can improve strength in the vertical direction. [Solution] A civil engineering structure is provided in which a stack of legged bases is arranged in a horizontal plane, each having a base, an outer cylinder with an open bottom and a closed top that protrudes upward from the base, and an inner cylinder with an open top and a closed bottom that protrudes downward from the top surface of the outer cylinder, wherein an internal cavity is formed inside the inner cylinder, an intermediate cavity is formed between the outer cylinder and the inner cylinder, and a vertical PVC pipe is inserted into the internal cavity or the intermediate cavity.

Description

Technical Field

[0001] The present invention relates to a buried civil engineering structure (frame structure / void structure).

Background Art

[0002] There is known a water storage tank that forms a rainwater storage space by installing a civil engineering structure in which a large number of blocks (pedestals) with a high void ratio are stacked in a depression and backfilling with soil (for example, Patent Document 1). The civil engineering structure can also be used for forming a dam structure, an embankment, etc.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] The pedestals constituting the conventional civil engineering structure were made of plastic (for example, Patent Documents 2 and 3). Therefore, there was a problem that the strength in the vertical direction was low and it deformed due to earth pressure from above. An object of the present invention is to provide a civil engineering structure capable of improving the strength in the vertical direction.

Means for Solving the Problems

[0005] In the present application, a pedestal portion, an outer cylinder having an open bottom surface and a bottomed top surface protruding upward from the pedestal portion, a civil engineering structure in which a laminate of pedestals having an inner cylinder with an open top surface and a bottomed bottom surface protruding downward from the top surface of the outer cylinder is arranged in a horizontal plane, an inner void portion is formed inside the inner cylinder, An intermediate space is formed between the outer cylinder and the inner cylinder. A vertical PVC pipe is inserted into the aforementioned internal space or the aforementioned intermediate space. The civil engineering structure will be disclosed. [Brief explanation of the drawing]

[0006] [Figure 1] This shows a water storage tank 3 using a civil engineering structure 1 according to one embodiment of the present invention. [Figure 2] A side view shows the civil engineering structure 1 using the legged base 10. [Figure 3] The legged base 10 is shown. (a) is a perspective view. (b) is a cross-sectional view. [Figure 4] The image shows a legged base 10 with a support column 20 inserted into an inner cylinder 14. (a) is a plan view. (b) is a cross-sectional view. (c) is a perspective view. [Figure 5] This diagram illustrates the insertion points of the support columns 20 in the leg-supported base 10. [Figure 6] A side view of the deformed civil engineering structure 1 is shown. [Modes for carrying out the invention]

[0007] Figure 1 shows a water storage tank 3 using a civil engineering structure 1 according to one embodiment of the present invention. By installing the civil engineering structure 1 in a depression 2 covered with a waterproof sheet and backfilling it with soil, a water storage tank 3 capable of storing rainwater can be formed. The area above the water storage tank 3 can be used as a parking lot, road, park, etc. The civil engineering structure 1 may also be installed under a road surface or under a house to be used as an embankment, or it may be installed at the bottom of a dam to form a dam structure. Side walls 4 and a ceiling 5 may be provided on the sides or top of the civil engineering structure 1.

[0008] Figure 2 shows a civil engineering structure 1 using a base (block) 10. The civil engineering structure 1 has multiple stacked bodies 6 arranged in a horizontal plane, and each stacked body 6 has multiple bases 10 stacked vertically. In this example, one stacked body 6 is formed by stacking four bases 10. As shown in the figure, it is preferable that the bases 10 are stacked inverted relative to each other in each layer.

[0009] Figure 3 shows a legged base 10 of one embodiment used in a civil engineering structure 1. If the legged base 10 is made of plastic, it becomes lighter, which is advantageous as it facilitates stacking work. As shown in the figure, the legged base 10 has a base portion 11 and leg portions 12 (Figure 3(a)). The leg portion 12 has a double structure consisting of an outer cylinder 13 and an inner cylinder 14 (Figure 3(b)).

[0010] The leg portion 12 in this example has a hollow outer cylinder 13 with an open bottom and a closed top that protrudes upward from the base portion 11, and a hollow inner cylinder 14 with an open top and a closed bottom that protrudes downward from the top surface of the outer cylinder 13 (Figure 3(b)). The outside of the outer cylinder 13 may be a cylindrical shape with a constant cross-sectional area in the height direction, but it may also be a frustoconical shape that tapers upward as shown in the figure.

[0011] In this example, an internal cavity 15 is formed inside the inner cylinder 14, and an intermediate cavity 16 is formed between the outer cylinder 13 and the inner cylinder 14 (Figure 3(b)).

[0012] Figure 4 shows a legged base 10 with a support column 20 inserted into the inner cylinder 14. As shown in the figure, the support column (pipe) 20 can be inserted vertically into the inner cavity 15 of the legged base 10. The support column 20 is preferably made of PVC due to its availability on the market and its light weight.

[0013] Figure 5 illustrates the insertion locations of the PVC pipes (support columns) 20 in the legged base 10. First, a PVC pipe 20a can be inserted into the inner cavity 15 inside the inner cylinder 14 (Figure 5(a)). Also, a PVC pipe 20b can be inserted into the intermediate cavity 16 between the outer cylinder 13 and the inner cylinder 14 (Figure 5(b)). As the diameter increases, inserting a PVC pipe 20b results in a greater improvement in vertical strength than inserting a PVC pipe 20a.

[0014] As shown in Figures 5(a) and 5(b), the lengths of the PVC pipes 20a and 20b inserted inside the base 10 are both equal to the height of two steps of the base 10.

[0015] FIG. 6 shows the civil engineering structure 1 in a deformed form in a side view. Comparing with the example of FIG. 2, the thickness of the PVC pipe 20 inserted into the pedestal 10 is larger in the example of FIG. 6. In addition, in the example of FIG. 2, the PVC pipe 20(20a) is divided at the location of half of the height of the laminate 6, while in the example of FIG. 6, the PVC pipe 20b is divided at the locations of one-fourth and three-fourths of the height of the laminate 6.

[0016] As shown in FIGS. 2, 5, and 6, in the civil engineering structure 1, while using one type of pedestal 10, it is possible to change the thickness and insertion location of the PVC pipe according to the degree of improvement in the required vertical strength.

[0017] The civil engineering structure 1 of the above-described embodiment can be constructed by manual arrangement / layering. By inserting a vertical PVC pipe (column) 20 into the inner cavity 15 or the intermediate cavity 16, the vertical strength of the civil engineering structure 1 is improved. The creep resistance can also be improved. Since the PVC pipes 20a and 20b are both readily available in the market as off-the-shelf products, the cost of the civil engineering structure 1 can be reduced.

[0018] The dimensions, shapes, arrangements, numbers, etc. of the civil engineering structure 1, the pedestal 10, or their elements described in the above embodiment are illustrative, and other aspects are also possible.

Description of Reference Numerals

[0019] 1 ··· Civil engineering structure 2 ··· Depression 3 ··· Water storage tank 4 ··· Side wall 5 ··· Ceiling 6 ··· Laminate 10 ··· Pedestal 11 ··· Base part 12 ··· Leg part 13 ··· Outer cylinder 14 ··· Inner cylinder 15 ··· Inner cavity 16 ··· Intermediate cavity 20, 20a, 20b ··· PVC pipe (column)

Claims

[Claim 1] The base and, An outer cylinder with an open bottom and a closed top protrudes upward from the aforementioned base, A civil engineering structure comprising stacked legged bases arranged in a horizontal plane, each having an inner cylinder with an open top and a closed bottom that protrudes downward from the upper surface of the outer cylinder, An internal cavity is formed inside the inner cylinder. An intermediate space is formed between the outer cylinder and the inner cylinder. A vertical PVC pipe is inserted into the aforementioned internal space or the aforementioned intermediate space. Civil engineering structure.

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