JPH07119483B2 - Underground structure for rainwater storage and infiltration - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground structure for storing and permeating rainwater, which temporarily stores rainwater that has permeated from the ground and naturally permeates into the ground.

[0002]

When excessive rainwater infiltrates into the ground due to a large amount of rainfall, the amount of drainage to the sewer is conventionally adjusted by a regulating pond constructed around the residential land. Although the flood control of rivers is attempted, it is difficult to secure a regulating pond, and a site of sufficient size and maintenance after construction are required. There is a tendency that a method of temporarily storing rainwater will be put into practical use by constructing it inside and making the structure have the same function as a regulating pond while using the ground site.

This underground structure is constructed by laying concrete blocks on the ground where roots have been cut,
It has the advantage that the ground space can be effectively used as a normal site while it plays the role of a regulating pond by backfilling with earth and sand after construction, and concrete blocks generally have openings to allow water to freely pass through the side plates. It has a box culvert shape and is laid in one direction in the axial direction or in two directions including the width direction to form a structure.

When continuously laying in the width direction, it is necessary to prevent the lid plate from dropping due to the movement between the adjacent blocks and the collapse of the backfilled soil accompanying it.
Reinforcement is bulged from the bottom slabs of adjacent blocks such as No. 5092 and the like, by placing in-situ concrete between the bottom slabs of both blocks, or by placing an intermediate concrete plate, and using some means on both blocks. Blocks are integrated in the width direction by connecting with, but in the method of making adjacent blocks continuous using cast-in-place concrete or precast plate, the blocks are positioned with respect to the adjacent blocks and the distance between blocks is increased. It is necessary to lay it while adjusting the construction, the construction is complicated, and the construction period is unavoidable.

The present invention was made in view of the actual situation of conventional underground structures for storing rainwater, and is intended to newly propose a structure having good continuity between blocks in the width direction and good connection workability. is there.

[0006]

According to the present invention, in a concrete block main body having a box-shaped cross section, a tension plate is projected in the width direction of the main body from a side plate at a position continuous with the bottom slab, and an adjacent concrete block is attached to the tension plate. By arranging them in abutment with each other, it is possible to eliminate the work of placing concrete on the site and the work of installing concrete plates to make blocks continuous, and to ensure continuity between concrete blocks in the width direction only by laying them. At the same time, positioning adjustment for adjacent blocks becomes unnecessary, and laying workability is improved.

Positioning adjustment between blocks when the projecting plates are projected from the box-shaped main body and the projecting plates are abutted against each other so that adjacent blocks are continuous to arrange the bars or when a concrete plate is installed. Is unnecessary,
Work efficiency is improved when laying concrete blocks.

Further, through holes which penetrate the main body in the axial direction at four corner positions on the cross section of the main body composed of the top plate, the side plate and the bottom slab of the concrete block, the main body in the width direction at both ends of the main body in the axial direction of Zhang Publishing. Inserting through-holes through each of them, inserting PC steel rods into each of these through-holes, and connecting concrete blocks adjacent to each other in the axial direction and width direction with PC steel rods, the integrity of the entire underground structure By ensuring the above, the work of connecting the blocks in the axial direction and the width direction will be facilitated, the workability will be improved, and the construction period will be shortened.

The concrete block is installed on a crushed stone layer laid on the ground where the root is cut, and a crushed stone layer is formed under the concrete block to promote penetration of the concrete block into the ground, The stored rainwater penetrates into the crushed stone layer through the opening of the overhanging plate of the concrete block and then into the ground.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

[0011] underground construction B Figure 1 the side plates 1 _2, 1 to ₂ Zhang published 1 _4, 1 ₄ concrete block 1 is overhanging the body 1 ₀ box-shaped as shown in Figure 3 of the present invention, FIG. 2 As shown in Fig. 3, the rainwater that is laid continuously in the ground in the axial direction and the width direction, is constructed by connecting concrete blocks 1 and 2 in two directions with PC steel rods 4 and 4 in each direction. The water is stored once and permeates into the ground naturally.

[0012] The body 1 ₀ of concrete block 1 is the bottom plate 1 ₁
The side plates 1 _2, 1 ₂ and a box-shaped cross section from the top plate 1 ₃ which, opening 1a penetrating in the thickness direction is formed in a part of the side plate 1 _2,
The upper portion of the side plate 1 _{and second} flange 1b which supports the cover plate 2 is projected. Side plates 1 ₂ of the opening 1a may be any rainwater freely pass, the shape is not specified.

[0013] underground structures in B, that is the inside of the concrete block 1 enters from the side plates 1 ₂ of the opening 1a, is stored.

[0014] ChoIzuruban 1 _4, 1 ₄ overhang the side plate 1 _2, 1 ₂ from the body 1 ₀ width direction of consecutive positions on the bottom plate 1 _1, as shown in FIG. 3, through a part in the thickness direction The opening 1c is formed. Figure 4 is shows a concrete block 1 is located in both ends in the width direction of the underground structures B, ChoIzuruban 1 ₄ concrete blocks 1 located at the end projecting from only one side of the body 1 ₀ It Rainwater stored in concrete block 1 penetrates from the opening 1c bored in the ChoIzuruban 1 ₄ into the ground through the crushed stone layer 3 below.

As shown in the figure, the concrete blocks 1 and 1 have end faces in the axial direction, and in the width direction, the tension publications 1 ₄ and 1 ₄ face each other and are continuous in two directions. 1,1 ChoIzuruban 1 ₄ on the side the counter as shown in FIG. 2, 1 ₄ without requiring any special positioning operation by the butted to each other, are arranged in succession.

As shown in FIG. 1, the concrete block 1 is laid on a crushed stone layer 3 laid on the ground that has been root-cut to promote the infiltration of rainwater. The crushed stone layer 3 is laid so as to surround the underground structure B so that the rainwater that has permeated from the ground is introduced into the underground structure B.

The insertion hole 1d in four corners on the cross section of the main body 1 ₀ through the body 1 ₀ in the axial direction is also Zhang published across the opening 1c
1 _4, 1 _4, insertion holes 1e in the axial ends of the body 1 ₀ passing through the body 1 ₀ in the width direction, 1e are respectively bored.

[0018] This, the insertion holes 1d of the body 1 ₀ and ChoIzuruban 1 _4, 1e
As shown in FIG. 2, the PC steel rods 4 and 4 are inserted, and the concrete blocks 1 and 1 which are continuous in the axial direction and the width direction are connected and integrated with each other by the PC steel rods 4 and 4 in the respective directions. . A step is formed on each of the insertion holes 1d and 1e in the axial direction and the width direction in order to avoid collision of the PC steel rods 4 and 4 in both directions.

The end portion of the PC steel rod 4 is fixed to the concrete block 1 located around the underground structure B, while the middle portion is inserted through the concrete block 1 located in the middle according to the scale of the underground structure B. It is connected by a coupler in the holes 1d and 1e.

The underground structure B is constructed as shown in FIG. 1 in which a cover plate 2 is installed between the flanges 1b, 1b of the concrete blocks 1, 1 adjacent in the width direction.

FIGS. 5 and 6 show an embodiment in which the ground beneath the underground structure B is an impermeable layer of cohesive soil or the like, and is a geological structure that takes a long time to penetrate rainwater.

In this case, by increasing the depth of the crushed stone layer 3 as shown in FIG.
The amount of rainwater that permeates into the ground is increased, and the penetration into the surrounding ground is promoted.

FIG. 6 shows an embodiment in which the water-impermeable layer is particularly thick and there is a distance to the water-permeable layer below the water-permeable layer. By forming a crushed stone column 3'of the same quality as the crushed stone layer 3 up to the water permeable layer, the crushed stone layer 3 and the water permeable layer are connected to each other to promote penetration into the water permeable layer.

[0024]

As described above, the present invention is as described above, and a tension plate is extended in the width direction of the main body from the side plate of the concrete block which is continuous with the bottom plate, and adjacent concrete blocks are installed so that the tension plates are butted against each other. Therefore, the work of placing concrete on the site and the work of installing concrete plates are not required, and the continuity between the concrete blocks in the width direction is secured by only laying it, and at the same time, it is continuous in the width direction. This eliminates the need for positioning and adjusting work, thereby improving the work efficiency of laying concrete blocks and improving the workability.

Further, through holes are provided at the four corners of the main body and at both ends of the Zhang Publishing, respectively, and a PC steel rod is inserted through each of these through holes, and a concrete block continuous in the axial direction and the width direction is connected to the PC steel rod. Since they are connected to each other to ensure the integrity of the entire underground structure, the work of connecting the concrete blocks is easy, and the workability can be improved while improving the efficiency of the laying work and shortening the construction period. Can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an underground structure of the present invention.

FIG. 2 is a perspective view showing how concrete blocks are connected in two directions.

FIG. 3 is a perspective view showing a concrete block located in the middle of an underground structure.

FIG. 4 is a perspective view showing a concrete block located at an end of an underground structure.

FIG. 5 is a cross-sectional view showing an example in which the crushed stone layer is deepened.

FIG. 6 is a cross-sectional view showing an example in which a crushed stone column is formed between a crushed stone layer and a water permeable layer.

[Explanation of symbols]

B ...... underground structures, 1 ...... concrete block, 1 ₀ ...
… Main body, 1 ₁ …… Bottom plate, 1 ₂ …… Side plate, 1 ₃ …… Top plate, 1 ₄ ……
Overhang plate, 1a ... opening, 1b ... flange, 1c ... opening, 2
... Lid plate, 3 ... crushed stone layer, 3 '... crushed stone pillar, 4 ... PC steel rod.

Claims (1)

[Claims] 1. A concrete block having a box-shaped cross section, an opening penetrating in a plate thickness direction formed in a part of a side plate, and a flange for supporting a lid plate protruding from an upper portion of the side plate. Structure that is laid continuously in the width direction and the width direction, and is constructed by installing a cover plate between the flanges of the concrete blocks that are adjacent in the width direction, and the rainwater that has penetrated from the ground is temporarily stored while allowing it to naturally infiltrate into the ground. From the side plate of the concrete block, which is continuous with the bottom plate, a zhang publishing part with an opening penetrating in the plate thickness direction overhangs in the width direction of the main body, and consists of the top plate, the side plate and the bottom plate. The box-shaped main body has through-holes that penetrate the main body in the axial direction at the four corners of the cross section, and Zhang Publishing has through-holes that penetrate the main body in the width direction at both axial ends of the main body. Has been done,
The concrete blocks are installed on the crushed stone layer laid on the ground where the roots have been cut, with the tension blocks of the concrete blocks adjacent to each other in the width direction butted against each other, and the PC steel rods are inserted in the respective axial and width insertion holes. An underground structure for storage and infiltration of rainwater, characterized in that the concrete blocks that are inserted through and are continuous in the axial direction and the width direction are connected to each other by PC steel rods in each direction.