Lattice structure, foundation structure device, and post installation method

Abstract

To easily install a foundation structure of a car stop pole underground.SOLUTION: A foundation structure 50 of a car stop pole 10 has a lattice structure 30A including a cylindrical sheath pipe 31 and a lattice body 30 supporting the cylindrical sheath pipe 31. A concrete member 51 obtained by filling ready-mixed concrete is provided on the lattice structure 30A.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a grid structure that is buried underground and supports posts such as bollards installed on roads, sidewalks, parks, etc., a foundation structure device, and a method for installing the posts. [Background technology]

[0002] BACKGROUND ART Bollards and other supports have been installed on roads, sidewalks, parks, and the like to prohibit vehicles from entering the roads, sidewalks, parks, and the like.

[0003] Such support poles, such as car stop poles, extend vertically, have an elongated cylindrical body as a whole, and are installed by being buried in the ground. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-47400 Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned support poles, such as car stop poles, are buried in the ground and supported by a foundation structure. However, no foundation structure has been developed that can easily and simply install support poles underground and that can support the support poles with sufficient strength.

[0006] The present disclosure has been made in consideration of these points, and aims to provide a lattice structure, a foundation structure device, and a method for installing supports that allow supports to be easily and simply installed underground and that can hold the supports with sufficient strength. [Means for solving the problem]

[0007] The present disclosure relates to a lattice structure that supports posts and is buried in the ground, the lattice structure comprising: a cylindrical sheath pipe that supports the posts and extends vertically; and a lattice body that holds the cylindrical sheath pipe, is arranged horizontally, and is buried in the ground, the lattice body having a plurality of vertical members that are parallel to one another and a plurality of horizontal members that are parallel to one another, and the cylindrical sheath pipe is fitted into openings formed by cutting the vertical members and the horizontal members.

[0008] The present disclosure relates to a lattice structure in which a pair of support members are provided between a pair of opposing side surfaces of the cylindrical sheath tube and the lattice body, and each support member has a vertical surface joined to the pair of side surfaces of the cylindrical sheath tube and a bottom surface joined to the lattice body.

[0009] The present disclosure relates to a lattice structure in which an additional support member is provided between the lattice body and a side surface of the cylindrical sheath tube that is spaced 90° from the pair of side surfaces in a plan view, and the additional support member has an additional vertical surface joined to the side surface of the cylindrical sheath tube and an additional bottom surface joined to the lattice body.

[0010] The present disclosure relates to a foundation structure comprising the above-described grid structure buried in the ground and a concrete member placed on the grid structure.

[0011] The present disclosure relates to a method for installing a support pillar, comprising the steps of preparing the above-described lattice structure, excavating a hole from the surface of the earth into the ground, placing the lattice structure in the excavated hole, fitting the support pillar into the cylindrical sheath pipe of the lattice structure, and providing a concrete member in the excavated hole. [Effects of the Invention]

[0012] As described above, according to the present disclosure, the support pole can be easily and simply installed underground, and the support pole can be maintained with sufficient strength. [Brief explanation of the drawings]

[0013] [Figure 1] Figure 1 is a side cross-sectional view of the foundation structure supporting the car stop pole during construction. [Figure 2] FIG. 2 is a cross-sectional side view of FIG. 1, seen from a direction 90 degrees apart. [Figure 3] FIG. 3 is a plan view showing a lattice structure supporting a bollard pole. [Figure 4] FIG. 4 is a plan view showing the lattice structure with the bollard poles removed. [Figure 5] FIG. 5 is a side cross-sectional view showing a grid structure. [Figure 6] FIG. 6 is a plan view showing a cylindrical sheath tube, a support member, and an additional support member. [Figure 7] Figure 7 is a process diagram showing how to install a car stop pole. [Figure 8] Figure 8 is a process diagram showing how to install a car stop pole. [Figure 9] Figure 9 is a process diagram showing how to install a car stop pole. [Figure 10] Figure 10 is a process diagram showing how to install a car stop pole. [Figure 11A] FIG. 11A is a cross-sectional side view showing a reinforcing device. [Figure 11B] FIG. 11B is a front view showing the reinforcing device. [Figure 12A] FIG. 12A is a perspective view showing the reinforcing device, with the upper cover removed for convenience. [Figure 12B] FIG. 12B is a top view showing the reinforcing device, with the cover removed for convenience. [Figure 13A] FIG. 13A is a cross-sectional view showing a longitudinal member. [Figure 13B] FIG. 13B is a cross-sectional view showing the side plate. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0015] 1 to 13B are diagrams illustrating an embodiment of the present disclosure.

[0016] First, as shown in FIGS. 1 and 2, a foundation structure 50 according to the present disclosure is embedded in the ground 1A and supports a support such as a car stop pole 10.

[0017] That is, a vehicle stop pole (also called a support pole) 10 is installed on a road, sidewalk, park, etc. for the purpose of prohibiting vehicles from entering, and such a vehicle stop pole 10 is firmly supported by a foundation structure 50 buried in the ground 1A.

[0018] Next, the car stop pole 10 will be described.

[0019] 1, 2, and 7, the car stop pole 10 is buried in the ground 1A and includes an elongated cylindrical body 11 having a lower end 11a and an upper end 11b, and an elongated reinforcing device 20 that reinforces the car stop pole 10 is provided inside the cylindrical body 11 of the car stop pole 10. This reinforcing device 20 is arranged inside the car stop pole 10, and is able to absorb the impact when a vehicle collides with the car stop pole 10.

[0020] Of these, the car stop pole 10 includes a cylindrical body 11 that is embedded in the ground 1A, and in this embodiment, the ground 1A is made up of layers formed below the ground surface 1. In other words, the ground 1A is made up of a roadbed 2 formed in order from the lower layer to the upper layer, a roadbed 3 on the roadbed 2, and a pavement 4 on the roadbed 3.

[0021] The upper surface of the pavement 4 becomes the ground surface 1, and the cylindrical body 11 of the car stop pole 10 is buried in the ground 1A. The lower part of the cylindrical body 11 buried in the ground 1A is surrounded and reinforced by concrete members 51 filled in the ground 1A (see Figures 1 and 2).

[0022] As mentioned above, the car stop pole 10 is firmly held and fixed by the foundation structure 50 buried in the ground 1A, and this foundation structure 50 will be described later.

[0023] The cylindrical body 11 buried in the ground 1A has an open bottom end 11a and an open top end 11b, both of which are sealed with a cap 11c. A reflective tape 11c1 containing glass beads can be attached to the outer surface of the cap 11c.

[0024] Next, the elongated reinforcing device 20 provided inside the cylindrical body 11 will be described with reference to Figures 11A to 12B. As shown in Figures 11A to 12B, the reinforcing device 20 has an outer cylindrical body 21 formed as a regular square cylinder having four corners 21a and four faces 21b, and an inner cylindrical body 22 formed as a regular square cylinder having four corners 22a and four faces 22b, which is inserted into the outer cylindrical body 21. Each corner 22a of the inner cylindrical body 22 abuts against a corresponding face 21b of the outer cylindrical body 21.

[0025] In this embodiment, each corner 22a of inner cylinder 22 abuts against a center 21c of corresponding surface 21b of outer cylinder 21, and is welded and fixed to center 21c of surface 21b.

[0026] Here, central portion 21c of corresponding surface 21b of external cylindrical body 21 refers to the central portion of surface 21b between corners 21a of external cylindrical body 21. Since each corner 22a of internal cylindrical body 22 abuts against central portion 21c of corresponding surface 21b of external cylindrical body 21 in this manner, external cylindrical body 21 made of a regular square cylinder and internal cylindrical body 22 made of a regular square cylinder are arranged in a state where their shapes are similar to each other but rotated by 45°.

[0027] In this way, the reinforcing device 20 is made up of the outer cylindrical body 21 and the inner cylindrical body 22 which are similar in shape and rotated by 45°, and this gives the reinforcing device 20 itself great bending rigidity.

[0028] As described above, reinforcement device 20 has outer cylindrical body 21 and inner cylindrical body 22, and both ends of outer cylindrical body 21 are preferably sealed by lids 23, 23 (see FIGS. 11A and 11B).

[0029] As shown in FIG. 2, the reinforcing device 20 provided in the cylindrical body 11 extends downward from the ground surface 1 by a length L1, and extends upward from the ground surface 1 by a length L2.

[0030] In this embodiment, the length L1 of the reinforcing device 20 from the ground surface 1 to the lower end is 200 mm to 400 mm, and the length L2 from the ground surface 1 to the upper end is 200 mm to 600 mm.

[0031] Here, the length L2 from the ground surface 1 to the upper end of the reinforcing device 20 corresponds to the collision height when a vehicle collides with the car stop pole 10.

[0032] The length L1 from the ground surface 1 to the lower end of the reinforcement device 20 is set to a length corresponding to the length L2. By setting the lengths L1 and L2 of the reinforcement device 20 in this way, even if a vehicle collides with the bollard pole 10, the vehicle collision can be effectively absorbed.

[0033] The length of the car stopping pole 10 from the ground surface 1 to the upper end of the cap 11c is L, which is 600 mm to 850 mm. The car stopping pole 10 has an outer diameter D1 of, for example, 110 mm to 130 mm.

[0034] Next, the foundation structure 50 that is embedded in the ground 1A and holds the bollard pole 10 will be described with reference to FIGS. 1 to 6. FIG.

[0035] The foundation structure 50 holds the car stop pole 10 and comprises a grid-like body 30, a grid-like structure 30A attached to the grid-like body 30, and a concrete member 51 provided on the grid-like structure 30A.

[0036] Next, the grid structure 30A of the base structure 50 will be described.

[0037] 4 to 6, the grid structure 30A has a cylindrical sheath pipe 31 that extends vertically and into which a vertically extending bollard pole 10 is inserted to support the bollard pole 10, and a grid body 30 that holds the cylindrical sheath pipe 31 and is embedded in the ground 1A and arranged horizontally. Of these, the grid body 30 has a plurality of parallel vertical members 32, for example, ten, and a plurality of parallel horizontal members 33, for example, eight, and is formed like a flat plate extending horizontally as a whole, and is placed horizontally on the bottom surface 5a of the excavation hole 5 described later.

[0038] As shown in FIG. 13A, the ten vertical members 32 have an I-shaped cross-sectional shape, with a height S1 of, for example, 25 mm, a width S2 of the lower portion 32a and the upper portion 32b of, for example, 5 mm, and a width S3 of the central portion 32c of, for example, 3 mm.

[0039] The ten vertical members 32 each having an I-shaped cross section are arranged with their lower portions 32a facing downward and their upper portions 32b facing upward.

[0040] The eight horizontal members 33 are obtained by twisting a square bar having a square cross section with a side of 5 mm, for example.

[0041] Furthermore, a pair of side plates 34, 34 extending parallel to the eight horizontal members 33 are provided on both sides of the eight horizontal members 33.

[0042] The pair of side plates 34, 34 has a rectangular cross section, and this cross section has a height t1 of, for example, 50 mm and a width t2 of, for example, 4.5 mm (see FIG. 13B).

[0043] The pair of side plates 34, 34 are arranged so that the height t1 direction faces the up-down direction.

[0044] In this embodiment, "above" and "below" refer to the "above" and "below" when the foundation structure 50 is disposed as shown in FIGS.

[0045] The ten vertical members 32, the eight horizontal members, and the pair of side plates 34 are arranged perpendicular to each other in a plan view to form a lattice-like structure 30. In this case, the ten vertical members 32 are arranged at intervals of a pitch P1 (for example, 90 mm), and the eight horizontal members 33 are arranged at intervals of a pitch P2 (for example, 100 mm).

[0046] The ten vertical members 32 formed in this grid-like configuration, the eight horizontal members 33, and the pair of side plates 34 form a solid grid-like structure 30. The grid-like structure 30 is made entirely of steel.

[0047] In addition, the grid body 30 is formed in a rectangular shape in plan view, with a vertical length W1 of, for example, 780 mm to 820 mm and a horizontal length W2 of, for example, 800 mm to 840 mm.

[0048] Furthermore, openings 40 are formed by cutting two vertical members 32 and two horizontal members 33 of the lattice body 30, and the cylindrical sheath tube 31 is fitted and held in this opening 40 (see Figure 5).

[0049] As shown in Figures 1, 2, and 5, the cylindrical sheath tube 31 is made of, for example, a steel pipe with a wall thickness of 6 mm, and the inner diameter D2 of the cylindrical sheath tube 31 is slightly larger than the outer diameter D1 of the car stop pole 10, and the inner diameter D2 is, for example, 140 mm to 160 mm.

[0050] As shown in FIG. 5, the length L4 from the upper end of the cylindrical sheath tube 31 to the surface of the lattice body 30 is, for example, 180 mm to 220 mm, and the length L5 from the lower end of the cylindrical sheath tube 31 to the surface of the lattice body 30 is, for example, 40 mm to 60 mm.

[0051] In addition, a pair of support members 36, 36 are provided between a pair of opposing side surfaces 31a, 31a of the cylindrical sheath tube 31 and the lattice body 30, and the cylindrical sheath tube 31 is firmly fixed to the lattice body 30 by this pair of support members 36, 36 (see Figures 5 and 6).

[0052] Each support member 36, 36 has an L-shaped cross section and has a vertical surface 36a joined to the side surface 31a of the cylindrical sheath tube 31 by welding, and a bottom surface 36b joined to the surface of the grid-like body 30 by welding.

[0053] In this way, by providing a pair of support members 36, 36 with an L-shaped cross section between the pair of opposing side surfaces 31a, 31a of the cylindrical sheath tube 31 and the lattice body 30, the cylindrical sheath tube 31 can be firmly fixed to the lattice body 30 by the pair of support members 36, 36.

[0054] In addition, an additional support member 37 is provided on a side surface 31b of the cylindrical sheath tube 31 that is spaced 90° apart from the pair of opposing side surfaces 31a in a plan view, firmly connecting the side surface 31b of the cylindrical sheath tube 31 to the lattice body 30 (see Figures 4 and 6).

[0055] This additional support member 37 has an L-shaped cross section and has an additional vertical surface 37a joined by welding to the side surface 31b of the cylindrical sheath tube 31, and an additional bottom surface 37b joined by welding to the surface of the lattice body 30.

[0056] In this way, by providing an additional support member 37 with an L-shaped cross section on the side surface 31b, which is spaced 90° from the pair of side surfaces 31a of the cylindrical sheath tube 31 in a plan view, and connecting the side surface 31b to the lattice body 30, the cylindrical sheath tube 31 can be firmly fixed to the lattice body 30 together with the support member 36 by the additional support member 37.

[0057] The support member 36 and the additional support member 37 both have an L-shaped cross section and have substantially the same cross-sectional shape. The support member 36 and the additional support member 37 each have a vertical surface 36a and an additional vertical surface 37a with a length of L6, and a bottom surface 36b and an additional bottom surface 37b with a length of L7.

[0058] In this embodiment, L6 is, for example, 80 mm, and L7 is 80 mm.

[0059] As described above, both the grid 30 and the cylindrical sheath tube 31 are made of steel. In addition, the support member 36 and the additional support member 37, which connect the cylindrical sheath tube 31 and the grid 30 and firmly fix the cylindrical sheath tube 31 to the grid 30, are also made of steel.

[0060] As shown in Figure 1, the foundation structure 50 that supports the bollard pole 10 is buried underground 1A, and in this case, the bollard pole 10 supported by the foundation structure 50 is placed near a curbstone 6 placed on the ground surface 1. In Figure 1, the part of the ground surface 1 underground 1A to the right of the curbstone 6 is the sidewalk, and the part to the left of the curbstone 6 is the roadway.

[0061] In this embodiment, the cylindrical sheath pipe 31 supported by the grid structure 30 is attached at a position closer to the curb 6 than the center 30a of the grid structure 30. This allows for a wider effective width of the sidewalk.

[0062] Furthermore, by attaching the cylindrical sheath pipe 31 at a position closer to the curb 6 than the center 30a of the lattice body 30 in this way, the lattice body 30 extends longer toward the opposite side of the curb 6 relative to the cylindrical sheath pipe 31 (see FIG. 1). Therefore, for example, if a vehicle collides with the bollard pole 10 from the curb 6 side, the moment acting on the bollard pole 10 can be reliably absorbed by the lattice body 30 extending longer from the cylindrical sheath pipe 31 toward the opposite side of the curb 6, and the bollard pole 10 can be reliably prevented from coming out of the ground 1A.

[0063] Next, the operation of this embodiment having such a configuration will be described with reference to FIGS.

[0064] First, the grid structure 30A is prepared. The grid structure 30A has a cylindrical sheath tube 31 into which the bollard pole 10 is inserted and which supports the bollard pole 10, and a grid body 30 which holds the cylindrical sheath tube 31.

[0065] When producing the lattice structure 30A, two vertical members 32 and two horizontal members 33 of the lattice body 30 are cut to form openings 40, and the cylindrical sheath tube 31 is fitted into this opening 40 to produce the lattice structure 30A.

[0066] The cylindrical sheath tube 31 is also firmly fixed to the grid body 30 by a pair of support members 36, 36 joined to a pair of side surfaces 31a of the cylindrical sheath tube 31 and the surface of the grid body 30, and an additional support member 37 joined to a side surface 31b of the cylindrical sheath tube 31 spaced 90° from the pair of side surfaces 31a, 31a and the surface of the grid body 30.

[0067] Next, the underground 1A is excavated from the surface 1 side to form an excavation hole 5 in the underground 1A (see FIG. 7).

[0068] This excavated hole 5 is for accommodating the lattice structure 30A, and therefore has a shape slightly larger than the lattice body 30 of the lattice structure 30A in plan view.

[0069] In this embodiment, the vertical length W3 of the excavated hole 5 is slightly larger than the vertical length W1 (780 mm to 820 mm) of the lattice body 30, for example, W3 is 810 mm to 850 mm. Also, the horizontal length W4 of the excavated hole 5 is slightly larger than the horizontal length W2 (800 mm to 840 mm) of the lattice body 30, for example, W4 is 830 mm to 870 mm.

[0070] The depth H of the excavated hole 5 is made up of the depth H1 of the roadbed 2 and the roadbed 3 and the depth H2 of the pavement 4, and in this embodiment, H is, for example, 260 mm to 300 mm.

[0071] In this manner, in this embodiment, the depth H (260 mm to 300 mm) of the excavation hole 5 can be made considerably smaller than the vertical length W3 (810 mm to 850 mm) and the horizontal length W4 (830 mm to 870 mm) of the excavation hole 5. By setting the depth H to be shallow in relation to the aspect ratio of the excavation hole 5 in this manner, it is possible to easily perform the work of excavating the underground 1A from the ground surface 1 using a shovel or the like.

[0072] Furthermore, according to this embodiment, by forming a relatively shallow excavation hole 5 in the ground 1A, even if foreign objects or the like are buried deep in the ground 1A, the excavation hole 5 can be formed without interfering with these foreign objects or the like.

[0073] Next, as shown in FIG. 7, the grid structure 30A prepared as described above is placed in the drilled hole 5.

[0074] Thereafter, the elongated reinforcing device 20 and the cylindrical body 11 of the car stop pole 10 are inserted in order into the cylindrical sheath pipe 31 of the lattice structure 30A. Then, a cap 11c is inserted onto the upper end 11b of the cylindrical body 11.

[0075] In this case, the lattice body 30 of the lattice structure 30A is placed on the bottom surface 5a of the excavation hole 5 and is supported on this bottom surface 5a. Alternatively, the cylindrical body 11 and reinforcing device 20 of the car stop pole 10 inserted into the cylindrical sheath pipe 31 may be placed on the bottom surface 5a of the excavation hole 5, or pebbles or the like may be placed on the bottom surface 5a so that the cylindrical body 11 and reinforcing device 20 are slightly raised from the bottom surface 5a (see FIG. 8).

[0076] In this way, the grid structure 30A can be placed in the excavated hole 5 formed in the ground 1A, and the cylindrical body 11 of the car stop pole 10 can be inserted into the cylindrical sheath pipe 31 of the grid structure 30A. In this case, the reinforcing device 20 is placed in the cylindrical body 11 of the car stop pole 10, and the cylindrical body 11 is reinforced by this reinforcing device 20.

[0077] Thereafter, as shown in FIG. 9, ready-mixed concrete is poured into the excavated hole 5 and onto the lattice structure 30A to fill it, and by hardening this ready-mixed concrete, a concrete member 51 can be provided in the excavated hole 5.

[0078] When fresh concrete is filled on the lattice structure 30A inside the excavated hole 5, the fresh concrete flows from above the lattice body 30 to below the lattice body 30, and the concrete members 51 obtained by hardening the fresh concrete can firmly fix the lattice structure 30A inside the excavated hole 5.

[0079] When filling the excavation hole 5 with fresh concrete, the fresh concrete is filled in all areas except for the pavement 4 portion underground 1A, and the concrete member 51 obtained when the fresh concrete hardens is placed in all areas except for the pavement 4 portion underground 1A.

[0080] 10, an additional pavement 4a is laid on the concrete member 51 in the excavated hole 5. The additional pavement 4a is laid on the same plane as the other pavements 4.

[0081] In this way, the car stop pole 10 reinforced by the reinforcing device 20 can be installed underground 1A. In this case, the car stop pole 10 is firmly fixed by a foundation structure 50 consisting of a lattice structure 30A buried in the underground 1A and a concrete member 51 provided on this lattice structure 30A.

[0082] As described above, according to this embodiment, the bollard pole 10 can be supported by the lattice structure 30A, which includes the cylindrical sheath pipe 31 into which the bollard pole 10 is inserted, and the lattice body 30, which supports the cylindrical sheath pipe 31 and is arranged horizontally within the bottom surface 5a of the excavated hole 5 and extends horizontally as a whole. Therefore, when a vehicle collides with the bollard pole 10, the moment acting on the bollard pole 10 can be absorbed by the lattice body 30, which is arranged on the bottom surface 5a of the excavated hole 5 and extends horizontally as a whole.

[0083] In this way, the moment acting on the bollard pole 10 can be received by the grid-like body 30 extending horizontally as a whole on the bottom surface 5a of the excavation hole 5, so the foundation structure 50 supporting the bollard pole 10 can be installed in a shallow portion of the ground 1A. Therefore, the depth H of the excavation hole 5 for installing the foundation structure 50 can be set relatively small, for example, H can be set to a small depth of 260 mm to 300 mm. As a result, with regard to the aspect ratio of the excavation hole 5, by setting the depth H of the excavation hole 5 shallow, it becomes easy to excavate the underground 1A from the ground surface 1 using a shovel or the like. Specifically, the aspect ratio of the excavation hole 5 can be set to about 0.3.

[0084] Furthermore, the foundation structure for the car stop pole 10 can be easily obtained by simply placing a lattice structure 30A in the excavation hole 5, placing the car stop pole 10 and the reinforcing device 20 in the cylindrical sheath pipe 31 of the lattice structure 30A, and pouring ready-mixed concrete into the excavation hole 5 to form the concrete member 51.

[0085] Additionally, the cylindrical sheath tube 31 of the lattice structure 30A is attached to the lattice body 30 by a pair of support members 36, 36 and an additional support member 37. In this case, the pair of support members 36, 36 and the additional support member 37 are joined to the cylindrical sheath tube 31 and the lattice body 30 by welding.

[0086] This allows the cylindrical sheath tube 31 to be firmly and securely attached to the grid 30 by the pair of support members 36 and the additional support member 37.

[0087] Furthermore, the cylindrical sheath pipe 31 supported by the grid body 30 is attached at a position closer to the curb 6 with respect to the center 30a of the grid body 30. This allows a wider effective width of the sidewalk to be secured. Furthermore, if a vehicle collides with the bollard pole 10 from the curb 6 side, the moment acting on the bollard pole 10 can be reliably absorbed by the grid body 30, which extends long from the cylindrical sheath pipe 31 toward the opposite side from the curb 6.

[0088] Furthermore, the concrete members 51 of the foundation structure 50 are obtained from ready-mixed concrete poured into the excavated hole 5. Therefore, compared to constructing the foundation structure 50 by placing pre-finished concrete blocks in the excavated hole 5, there is no need to transport heavy concrete blocks.

[0089] Furthermore, the ready-mixed concrete poured into the excavated hole 5 has good compatibility with the ground 1A, so that the concrete members 51 of the foundation structure 50 can be firmly installed in the ground 1A.

[0090] Furthermore, the ready-mixed concrete poured into the excavated hole 5 spreads throughout the lattice members 30 of the lattice structure 30A, so that the concrete members 51 and the lattice structure 30A can be firmly connected. [Explanation of symbols]

[0091] 1 Earth's surface 1A underground 2 Roadbed 3 Roadbed 4. Pavement 4a Additional paving 10 Parking Bollard 11 Cylinder 11a Lower end 11b Upper end 11c Cap 20 Reinforcement Device 21 Outer cylinder 21a Corner 21b side 21c central part 22 Inner tube 22a Corner 22b side 23 Lid 30 Grid 30A lattice structure 31 Cylindrical sheath tube 32 Longitudinal members 33 Transverse members 34 Side panel 36 Support member 36a vertical plane 36b Bottom 37 Additional support member 37a Additional vertical surface 37b Additional bottom surface 50 Basic structure 51 Concrete members H Depth of drilling hole W1: Vertical length of the grid W2: Horizontal length of the grid W3 Vertical length of the grid structure W4 Horizontal length of grid structure

Claims

1. In a grid structure that supports posts and is embedded in the ground, a cylindrical sheath tube that supports the support column and extends vertically; a grid-like body that holds the cylindrical sheath pipe, is arranged horizontally, and is buried in the ground; the grid has a plurality of parallel longitudinal members and a plurality of parallel transverse members; The cylindrical sheath tubes fit into openings formed by cutting the longitudinal and transverse members.

2. 2. The grid structure according to claim 1, wherein a pair of support members are provided between a pair of opposing side surfaces of the cylindrical sheath tube and the grid body, and each support member has a vertical surface joined to a pair of side surfaces of the cylindrical sheath tube and a bottom surface joined to the grid body.

3. 3. The grid structure according to claim 2, wherein an additional support member is provided between the grid body and a side surface of the cylindrical sheath tube that is spaced 90° from the pair of side surfaces in a plan view, and the additional support member has an additional vertical surface joined to the side surface of the cylindrical sheath tube and an additional bottom surface joined to the grid body.

4. The grid structure according to any one of claims 1 to 3, which is embedded in the ground; A foundation structure comprising: a concrete member placed on the grid-like structure.

5. A step of preparing a grid structure according to any one of claims 1 to 3; Excavating the earth from the surface to form a borehole; placing the grid structure within the borehole; fitting the support posts into the cylindrical sheath tube of the grid structure; and providing a concrete member within the drilled hole.

Images