JP3538345B2 - Rainwater storage and infiltration tank and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater storage and infiltration tank and a method of constructing the same, and more particularly to a rainwater storage and infiltration tank having a storage layer in which a recycle material is deposited in an underground storage and infiltration layer and a method of constructing the same.

[0002]

2. Description of the Related Art In recent years, in urban areas, sites around buildings and roads have been paved, and the area through which rainwater can penetrate from the ground surface has been greatly reduced. For this reason, if there is a certain amount of rainfall per unit time, rainwater that cannot permeate from the ground surface flows downstream as a surface flow. For this reason, urban rivers are flooded, causing damage such as flooding of houses each time. In order to solve such a problem, various rainwater storage facilities capable of temporarily storing a certain amount of rainwater and allowing rainwater to permeate from the ground surface have been constructed.

[0003] As a small-scale structure, osmotic water is collected in a permeable smelt that allows rainwater that has fallen to a certain area to penetrate underground. A method of collecting rainwater through a pipe network while allowing rainwater to penetrate the ground in a wide range has been proposed.

[0004] Incidentally, in the above-mentioned system in which part of rainwater penetrates into the ground and collects water through an laid pipe network, the temporary storage capacity of rainwater is small. For this reason, on a site with a large area such as a ground, a park, a parking lot with permeable pavement, rainwater can be stored directly in the underground part,
Further, it is preferable to construct a facility for gradually infiltrating rainwater into the lower layer in order to reduce the burden on downstream facilities. FIG.
FIG. 1 is a sectional view showing an example of this type of conventional rainwater storage / penetration layer 50. The rainwater storage and infiltration tank 50 shown in the figure is constructed under a part of the exercise ground G. The rainwater storage and infiltration tank 50 is filled with a crushed stone layer 51 so as to have a layer thickness of 0.8 to 1.8 m in an underground space in which a predetermined plane area is dug into a pit having a depth of 1.0 to 2.0 m. Further, a clay earth layer 52 having a thickness of about 0.2 m is laid on the ground surface.
In the rainwater storage and infiltration tank 50 configured as described above, the permeability of the crushed stone layer 51 in the tank is large, and the amount of rainwater flowing from the ground surface and the surrounding ground exceeds the permeation amount penetrating from the lower surface to the lower layer. However, rainwater that has flowed in temporarily floods the tank. For this reason, it is possible to prevent rainwater from flowing out of the ground surface, and it can be pumped up as necessary and used as miscellaneous drainage to be used for ground watering and the like.

[0005]

In order to secure a predetermined storage volume in this type of rainwater storage and infiltration tank, it is necessary to increase the plane area of the storage tank and to make the crushed stone layer deep (thick). However, as the crushed stone layer becomes thicker, the porosity at the bottom of the crushed stone layer is extremely reduced due to the weight of the crushed stone,
There is a problem that the ability to penetrate into the lower ground decreases. In addition, a large amount of crushed stone had to be filled, leading to an increase in construction costs.

[0006] In addition, when a long period of time elapses after the construction, it is expected that the voids in the crushed stone layer will be clogged, and the permeation capacity will be reduced. For this reason, it has been desired to use a filler that is unlikely to cause clogging even when used over time.

In recent years, various studies have been made on recycling plastic parts and tires generated from scrapped vehicles. Conventionally, waste tires are also used for reusing rectified tires, recycled tires, and the like depending on the degree of damage, but many of them are cut or chipped and used as a part of fuel and cement raw materials. Recycling of resin bumpers and the like is also being promoted, but many plastic parts are landfilled as shredder dust.

In view of the above, an object of the present invention is to solve the above-mentioned problems of the prior art, which is easy to construct, uses recycled materials as part of the filler, reduces construction costs, and reduces rainwater It is an object of the present invention to provide a rainwater storage and infiltration tank that functions as a storage and infiltration tank.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of disposing tires disposed vertically and horizontally in the vicinity of a bottom slab in an underground space in which the ground is dug in a pit shape.
And the cut tire as a skeleton
Around, the tire chip obtained by coarsely grinding the waste tire is filled with a predetermined porosity, a permeable bag, and a crushed stone layer and a permeable surface layer that fills the underground space above the permeable bag, A part of the rainwater that permeates from the ground surface in the backfilling area is temporarily stored in the water-permeable bag, and further penetrates into the lower ground.

[0010] As a construction method, waste tires are cut into the underground space where the ground has been dug into pits, near the bottom slab.
The cut tire that was cut, and the circumference using the cut tire as a skeleton
A water-permeable bag filled with tire chips obtained by coarsely pulverizing waste tires at a predetermined porosity is disposed vertically and horizontally, and a crushed stone layer and a water-permeable surface layer are stacked on the upper layer of the water-permeable bag to form the underground space. Is backfilled.

As another configuration of the infiltration tank, a plurality of stages of waste tires are installed near the bottom slab in the underground space where the ground is dug in a pit shape, and are stacked on the waste tires laid vertically and horizontally. To build and cut waste tires inside
Cut tire and the surroundings with the cut tire as a skeleton
A storage block in which tire chips obtained by coarsely grinding waste tires are filled at a predetermined porosity, and a crushed stone layer and a water-permeable surface layer that refill the underground space above the storage block, and the backfill area is A part of the rainwater that permeates from the ground surface is temporarily stored in the storage block and further permeates the lower ground.

As a construction method, waste tires are arranged lengthwise and breadthwise in the vicinity of a bottom slab in an underground space where the ground is dug in a pit shape, and several stages of waste tires are stacked on each waste tire, and the outer periphery of the waste tire is stacked. Constructing a storage block by constraining, a cut tire obtained by cutting a waste tire inside the storage block ,
Roughly crush waste tires around the cut tire
The obtained underground space is backfilled by filling the tire chips with a predetermined porosity, laminating a crushed stone layer and a permeable surface layer on the upper layer of the storage block.

[0013]

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rainwater storage and infiltration tank according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a part of the rainwater storage and infiltration tank 1 constructed in the target ground, with a part of the ground removed and shown in a cross section. In the present embodiment, as shown in FIG.
A pit with a depth of about 1.5m with a rectangular ground plane is excavated. At the bottom of the pit, a crushed stone layer 10 scattered in a thin layer having a thickness of 5 cm is provided. The upper surface of the crushed stone layer 10 is flattened, and on the crushed stone layer 10, flexible bags having a substantially cubic shape with one side of about 1 m are arranged vertically and horizontally. In the present embodiment, a material equivalent to single-grain crushed stone No. 5 having a uniform particle size is used for the crushed stone.

A flexible bag 20 (hereinafter, referred to as a bag 20) installed on the crushed stone layer is a three-dimensional bag capable of accommodating a bulk material. And a mesh sheet woven into a mesh having water permeability and sewn into a cubic bag. Although the illustrated bag 20 is designed to be folded at the top, it can be formed into a drawstring.

Each bag 20 is filled with a cut tire 21 and a tire chip 22 as recycled fillers manufactured from waste tires mixed at a predetermined ratio (see FIG. 2). The cut tire 21 is a relatively large cut material having a relatively rigid shape and cut so that the maximum dimension is about 200 mm so that a substantially U-shaped tire cross section is cut by a cutting machine. It is a small rubber piece that has been roughly pulverized by a pulverizer to remove steel wires and the like. By mixing these at an appropriate ratio and filling the bag 20, the porosity of the entire bag 20 can be variously adjusted. In addition, the cut tires 21 inside the bag 20 as a whole can have a skeletal rigidity by overlapping each other in the bag 20, and the backfill layer located on the bag 20 has a deformation resistance to the earth load and the overload. It can demonstrate its properties. Further, the tire chips 22 enter the large gaps formed between the cut tires 21, so that the gaps of the entire bag 20 are made uniform.
It goes without saying that the shape of the bag is not limited to a cube, but may be a cylindrical shape or the like.

The wedge-shaped side space 2 between the outer periphery and the slope of the aligned bags 20 is densely filled with crushed stone, so that the load of the backfill layer on the aligned bags 20 is reduced. When actuated, the lateral displacement of the bag 20 itself is restricted. Thereby, vertical deformation of the bag 20 can be suppressed.

In this embodiment, as the backfill layer, the crushed stone layer 30, the permeable concrete layer 31, and the clay soil layer 3
3 are installed on the bag 20. First, bag 2
0 is covered with a crushed stone layer 30 having a thickness of about 30 cm, and a permeable concrete layer 3 having a thickness of about 10 cm is formed on the crushed stone layer 30.
One is paved. This permeable concrete layer 31
Consists of a pavement in which a binder is used to bond aggregate composed of crushed stone and sand with a predetermined strength, and a rubber-based or synthetic resin-based emulsion type additive can be used as a binder. The concrete pavement has a bending strength of 2.46 N / mm ^2.
In the week, a permeability coefficient of k = 1.0 × 10 ⁻¹ cm / sec or more can be secured.

On the upper surface of the permeable concrete layer 31, a filter material 32 is laid. This filter material 32
Is made of a nonwoven fabric sheet, and prevents clay clay particles of the clay soil layer 33 applied on the filter material 32 from flowing into the permeable concrete layer 31. The thickness of the clay soil layer 33 is also set to about 10 cm.

As shown in FIG. 2, a predetermined water gradient is provided on the ground surface of the rainwater storage and infiltration tank 1, and the rainwater that has not permeated in this infiltration area flows downstream on the ground surface. However, since the auxiliary gutter 5 is constructed so as to be adjacent to the infiltration area, it penetrates the inside of the crushed stone layer 6 filled in this part, and further passes through the water collecting pipe 7 to a part of the storage infiltration tank 1 again. Can be relocated.

In the present invention, a crushed stone layer 1 made of single crushed stone
V _G = 4 as the porosity V _G at the time of crushed stone filling at 0,30
0% as a guide, the cut tire 21 as recycled filler in the bag 20, are set to V _t = 50-60% as porosity V _t with a mixture of tire chips 22.

Next, a storage block installed in the rainwater storage and infiltration tank 1 as another embodiment will be described with reference to FIGS. In the storage block 25, a round tire-shaped waste tire 26 is spread on a predetermined plane on the upper surface of the crushed stone layer 10 formed on the bottom surface of the pit, and further, the round tires 26 are stacked in several stages and each stage is stacked. This is an integrated structure restrained by a binding band 29 so as to surround the entire outer periphery of the tire. Further, as shown in FIG. 4, the above-described cut tire 21 is provided on a substantially rhombus portion 28 surrounded by the tires in plan view and a hollow portion 27 for mounting a wheel.
And the tire chip 22 are filled. Since the storage block 25 is a structure in which the tires 26 are stacked, the deformation resistance in the vertical direction is ensured. Further, since the side is restrained by the binding band 29, it is possible to suppress the protrusion to the side. It is preferable to use a resin band as the binding band 29.

In this embodiment, a clay earth layer 33 is laid on the ground surface with a predetermined thickness (20 cm). Rainwater from the ground surface penetrates between the clay soil layer 33, the crushed stone layer 30, and the storage block 25, and is stored in the storage block 25.
It gradually penetrates into the lower layer. Although the number of bags and the number of tires shown in FIGS. 1 and 3 are limited for explanation, actually, the number of bags and the number of tires corresponding to the plane size and the depth are applied. Needless to say, In addition, a scrap material such as a resin bumper can be used as a substitute for a cut tire by using a cut material. At this time, it is necessary to confirm that there is no risk of harmful paint components and the like being eluted into the groundwater from the coated product such as a resin bumper.

By providing a pumping equipment such as a water pump capable of pumping water from the bottom of the storage infiltration tank, when rainwater is stored to a certain level, the stored water is pumped up and drained into the ground as miscellaneous wastewater. It can be used for watering work, facility cleaning work, etc.

[0025]

As described above, the storage space of the storage infiltration tank that can store rainwater in the ground and allow it to further penetrate into the lower layer is constructed using waste tires and the like as recycled materials. be able to. This allows
A facility capable of reliably infiltrating and storing rainwater underground can be realized by applying recycled materials, and can contribute as an effective facility from the viewpoint of environmental protection and resource protection.

[Brief description of the drawings]

FIG. 1 is a partial sectional perspective view showing an embodiment of a rainwater storage and infiltration tank according to the present invention.

FIG. 2 is a sectional view showing an example of installing a bag of the rainwater storage and infiltration tank shown in FIG. 1;

FIG. 3 is a partial cross-sectional perspective view showing another embodiment of the rainwater storage and infiltration tank.

FIG. 4 is a partial plan view showing an example of arrangement of tires in the rainwater storage and infiltration tank shown in FIG.

FIG. 5 is a sectional view showing an example of a conventional rainwater storage and infiltration tank.

[Explanation of symbols]

1 Rainwater storage and infiltration tank 10,30 crushed stone layer 20 bags 21 cut tire 22 tire chips 25 storage blocks 26 round tires 31 Permeable concrete layer 33 clay soil layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E03F 1/00

Claims (4)

(57) [Claims] (1) A tire is disposed vertically and horizontally in the vicinity of a bottom slab in an underground space in which the ground is dug in a pit shape.
Cut cut tire, and the cut tire as a skeleton
Around, a permeable bag filled with a predetermined porosity with tire chips obtained by coarsely grinding waste tires, and a crushed stone layer and a permeable surface layer that fill the underground space above the permeable bag, A rainwater storage / penetration tank in which part of rainwater permeating from the ground surface in the backfilling area is temporarily stored in the water-permeable bag, and further permeates the lower ground. 2. A plurality of waste tires which are installed near the bottom slab in an underground space where the ground is dug in a pit shape and are stacked on each of the waste tires laid vertically and horizontally are restrained and constructed. ,
Cut tires with waste tires cut into them
Around the tire skeleton
A storage block eartip is filled with a predetermined porosity, is composed of a crushed stone layer and permeable surface layer backfilling the underground space of the upper the accumulating block, one rainwater to penetrate the ground surface of the backfill range A rainwater storage and infiltration tank, wherein the part is temporarily stored in the storage block and further penetrated into the lower ground. 3. A cut tire in which a waste tire is cut in the vicinity of a bottom slab in an underground space where the ground is dug in a pit shape.
And around the cut tire as a skeleton,
A permeable bag filled with crushed tire chips at a predetermined porosity is arranged vertically and horizontally, and a crushed stone layer and a permeable surface layer are laminated on the upper layer of the permeable bag to fill the underground space. Construction method of rainwater storage and infiltration tank. 4. A waste tire is disposed vertically and horizontally near a bottom slab in an underground space where the ground is dug into a pit, and several layers of waste tires are stacked on each waste tire and the outer periphery of the waste tire is restrained. building a reservoir block Te, Haita inside the accumulating block
Cut tires with cut ears and skeleton
Around , filled with a predetermined porosity of tire chips obtained by coarsely pulverizing waste tires , laminating a crushed stone layer and a permeable surface layer on the upper layer of the storage block, and backfilling the underground space, To build a rainwater storage and infiltration tank.