JP2000045371A - Installation method for rain water permeation facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously realize rain water permeating function by filling a renewable source aggregate sealed in a bag body made of a water permeable sheet outside a facility when embedding rain water permeating products. SOLUTION: Renewable source aggregate 3 is sealed in a bag body 2 consisting of a water permeable sheet material 1. This renewable source aggregate 3 is glass cullet crushed and polished to 0.2 to 20 mm and can be filled as it is. Also, a permeation basin 4 is a porous concrete product crated by forming continuous fine voids by connecting aggregate with a small amount of binding material. And a space around this permeation basin is filled with bag bodies 2. By doing this, fine voids will not be clogged and permeability is not degraded, so that permeation function can be realized continuously for a long period of time and thus, in view of the utilization of renewable source aggregate, it can be utilized in a broad range and can be contributed even to the acceleration of the use of renewable source aggregate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a rainwater infiltration facility capable of continuously exerting a rainwater infiltration function.

[0002]

2. Description of the Related Art Conventionally, concrete products and plastic products have been used as rainwater infiltration products such as infiltration basins, infiltration trenches, infiltration gutters and infiltration wells. There is a slit type with an elongated slit. Then, for example, as shown in FIG. 5, in a seepage measure or the like, a water-permeable sheet material 21 is laid on the side and bottom of the soil excavated in a mortar shape, and the seepage measure 2
No. 4 in the center and around No. 4 crushed stone (30-20 mm) 2
3 and the like, and the collected rainwater penetrates from the bottom and side surfaces, etc., to form a rainwater underground permeation facility.

On the other hand, the law on the promotion of the use of recycled resources was enacted in 1991, and in construction work, the ordering party, the contractor, the national government and local governments share their respective responsibilities.
The use of recycled resources such as construction byproducts such as earth and sand and concrete lumps will be promoted. Most of construction by-products are safe, and most of them are reusable as construction materials. Most of the present utilization fields of the construction by-products are used as roadbed materials for road construction. Pavement materials (such as interlocking blocks) are also used as substitutes for ordinary concrete aggregates, but they have not escaped trial use. It is considered that one factor is that the strength of the aggregate is smaller than that of the ordinary aggregate and the amount used is small because a method of mixing the aggregate with the ordinary aggregate is used. In addition, the supply system is being established, such as recycling incombustibles of city garbage and incineration residue after incineration of garbage, glass cullet, and ash of incinerated sewerage sludge as aggregates, but the application field is the road construction described above. The roadbed material alone will be oversupplied, and it will be necessary to expand its use as a recycled resource (use for another use). For example, molten slag of sewage sludge reduces ash content of sewage sludge under high temperature (120
(0 to 1500 ° C.), cooled by some method, and solidified. By this cooling method, molten slag can be roughly divided into two types, one is granulated slag obtained by cooling by direct contact or immersion with water, and the other is obtained by cooling in air. Air-cooled slag. The granulated slag is glassy and fine or sandy. The air-cooled slag is in the form of lumps or crushed stones. The particle size of the granulated slag is in the range of approximately 0.3 to 10 mm. The air-cooled slag is also glassy, has a particle size of about 10 to 100 mm, and is usually crushed and reused. Since slag has a small amount of fine particles and is glassy, slag cannot be sufficiently compacted as a roadbed material, and there is no other use. When slag is used, the incineration ash is more secure than landfill, and the capacity is reduced to about 1/3, so the disposal site can be saved by that much, but there is no change in the shortage of the disposal site and the effective use method There is a desire for expansion. Slag aggregate can also be produced from incinerated ash from municipal waste. The incineration residue recycled aggregate remains after removing valuables (metals) and ash from the incineration residue after incineration of municipal waste, pottery, porcelain, glass,
Many stones have a particle size range of 0.3 to 15 mm. Glass cullets obtained by crushing bottles and the like collected as incombustibles can be reused as glass products, but some are buried in landfills because of the cost of transportation to a recycling plant and the economics of landfills. As described above, aggregates of recycled resources contain a mixture of large and small particle diameters or contain a large amount of fine particles, and some are classified in a recycling factory. Therefore, there is a demand for a use method that can use particles having a wide range of particle sizes including fine particles, and a (simple) use method that does not require special equipment.

[0004]

However, in the above-mentioned underground infiltration facility (infiltration basin) for rainwater, depending on the particle size distribution of crushed stones and the like, fine particles enter the holes and slits from the outer periphery and impede water permeability. As a result, there is a possibility that the facility may be blocked or settled on the outer periphery. Therefore, 4
No. crushed stone is usually used. Further, when the holes and slits are made smaller, fine particles in crushed stones and the like are less likely to enter from the outer periphery, but are less permeable to water. Therefore, in order to maintain sufficient water permeability, many pores and small slits are necessary, but it is industrially practical to manufacture rainwater infiltration products with such many pores and small slits. is not. Furthermore, even if the particle size distribution of crushed stones is specified, when filling them, the crushed stones collide with each other due to the input pressure and generate new fine particles, so that the above-mentioned problem can be solved. could not. In particular, even if glass cullets are crushed and polished to round their corners, the glass cullets may collide with each other during the laying work or may be abraded and scattered in powder form. There was a danger of respiratory problems if inhaled. In addition, if relatively large fine particles adhere to the worker's skin or the like and rub without notice, there is a risk that the skin may be damaged by the glass particles. For this reason, it is necessary to work while covering the mouth and nose and not to expose the skin such as hands and arms, which is extremely troublesome.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above, and when a rainwater infiltration product for infiltrating rainwater into the ground is buried, a recycled material aggregate is provided on the outside of the product. The present invention relates to a construction method of a rainwater infiltration facility characterized by being filled in a state of being enclosed in a bag made of a material.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The rainwater infiltration product according to the present invention is either a perforated concrete product or a plastic product having a hole or an elongated slit through which rainwater penetrates, or an aggregate with a small amount of binder. It is a porous concrete product that is connected and forms continuous microvoids, and is manufactured as an infiltration basin, infiltration trench, infiltration ditch, permeable well, etc. There is no limitation. Therefore, a known rainwater infiltration product can be used as it is as the rainwater infiltration product in the present invention, and a method for producing the same and a method for opening holes and slits may be performed by a known method. Further, the rainwater infiltration product includes a rainwater storage and infiltration product that stores a certain amount of rainwater and uses it effectively.

As the filler in the present invention, a filler obtained by enclosing a recycled resource aggregate in a bag made of a water-permeable sheet material is used. Good, or those appropriately classified may be used. As described above, since the present invention uses recycled resource aggregates, it greatly contributes to promoting the use of recycled resources. In addition, the aggregate of recycled resources is generally produced (regenerated) in a city, so that the transportation problem that occurs when the aggregate is transported from a distance is solved, and the fare can be significantly reduced. Therefore, by using recycled resources aggregate,
It is possible to construct a rainwater infiltration facility at low cost.

The bag for enclosing the recycled resource aggregate, which is permeable to rainwater or the like, prevents the fine particles from flowing out even if the recycled resource aggregate filled therein is crushed therein. There is no particular limitation on the material and the like as long as the material does. For example, in a permeation basin or the like, it has been conventionally known that various water-permeable sheets are usually laid on the inner surface of an excavation hole or the like to prevent the inflow of earth and sand. It may be diverted as a material (a water-permeable sheet material) constituting the body. More specifically, there are the following.・ Non-woven fabric: chemical process (adhesive) without using a weaving machine or knitting machine.
Or a mechanical method (crochet, so-called needle punch method) or a thermal method (heat and pressure) to form a planar shape, which can be roughly classified into long fibers and short fibers. -Woven fabric: A warp made by using a weaving machine so as to have a structure in which warp yarns are arranged in parallel with weft yarns at right angles. -Geogrid: A sheet made of synthetic molecules or the like having a regular lattice structure, in which a tensile member is firmly bonded or integrated at an intersection.・ Gionet: A net-like structure, with relatively large openings surrounded by fibrous materials, and intersections are knotted or integral sheets of synthetic polymer, etc., distinguished from ordinary woven or knitted fabrics. ing. -Geocomposite: A single product has advantages and disadvantages, so it is a composite product that combines the advantages of the products with each other to perform the required functions. As described above, various materials can be used as the water-permeable sheet material constituting the bag, but the material is not limited as long as there is no quality deterioration due to water, and a so-called wire mesh may be used.

The bag does not impede rainwater permeation as described above and prevents the outflow of fine particles of the recycled resource aggregate. What is necessary is just to select a water-permeable sheet material having an opening diameter according to the following.
The material must have the characteristics of the item. 1. There must be no fine particles. 2. The vertical permeability of the water-permeable sheet material must be greater than that of the recycled aggregate. 3. Clogging should not be caused by suspended substances contained in rainwater. Therefore, in order to evaluate such a filtration function,
The relationship between the vertical permeability of the water-permeable sheet material and the water permeability of the recycled resource aggregate, and the relationship between the pore diameter (distribution) of the water-permeable sheet material and the particle size distribution of the recycled resource aggregate are important. For example, a nonwoven fabric in which 15% of the pore size distribution is 0.4 mm or more is 10 ⁻¹ cm
Those having a water permeability of not less than 0.1 / 0.3 mm have a water permeability of about 10 ^-2 cm / sec. It is considered that even recycled aggregate containing very fine particles has water permeability of about 10 ⁻³ cm / sec. In general, the permeability of the ground through which rainwater permeates is in the range of 10 ⁻³ to 10 ⁻⁵ cm / sec. Therefore, a sheet having a water permeability of about 10 ⁻² cm / sec does not inhibit the flow of water. The rainwater on the main road contains a suspended matter concentration of about 156 ppm, and the particle size distribution of the suspended matter falls in the range of 0.001 to 0.074, and 70 to 90%. That is, the above-mentioned 0.1-0.
If the sheet has an opening of 3 mm, there is no risk of clogging on the sheet surface. On the other hand, the particle size distribution of recycled resource aggregates with a particle size of 0.4 mm or less is considered to be about 30% or less, but the flow of rainwater is from rainwater infiltration products with holes or slits opened to bags (from permeable sheet materials). This is the flow to the recycled resources aggregate), and the fine particles of the recycled resources aggregate do not pass through the bag.

[0010] The shape and size of the bag are not particularly limited. For example, it may be used for 20 kg, 10 kg, or 5 kg so as to have a capacity that can be carried by one worker, or may be used in combination of a plurality of different sizes so that the space can be filled without gaps. Also, the sealing method after the recycled resource aggregate is accommodated in the bag is not particularly limited, and the opening or the vicinity thereof may be tied using a string or the like, or any method. But it is good. For example, a certain amount of recycled aggregate may be put into a bag made to a certain size in a factory by an appropriate device, and its opening may be closed by an appropriate closing device.

According to the method of constructing a rainwater underground seepage facility of the present invention, a bag made of a water-permeable sheet material 1 as shown in FIG. 2 is filled with recycled resource aggregate 3 in a sealed state.

An embodiment of the present invention using the bag 2 will be described below. The infiltration box 4 shown in FIG. 1 (b) is a porous concrete product in which aggregates are connected with a small amount of binder to form continuous fine voids, and the periphery thereof is made of conventional single-grain crushed stone or the like. Fig. 1 (a) in place of filler
Are filled. 5 is backfill soil.

The permeation trench 6 shown in FIG. 2 is a perforated plastic product having a hole 7 through which rainwater penetrates, and the periphery thereof is filled with the bag body 2 shown in FIG. did.

A storage infiltration basin 8 shown in FIG. 3 has a reinforced concrete layer 1 on the outer peripheral surface of a container 9 whose lower portion is made of plastic.
0 is a storage tank integrally formed, the upper part of which is a tubular permeable concrete side lump 11, and a concrete floor slab further provided with a lid receiving portion for attaching a dust removing device 12 made of punched metal and a permeable lid 13 on the upper surface thereof. 14 and the bag body 2 shown in FIG. 1A was disposed around the permeable concrete side lump 11 in the same manner as described above. In the figure, reference numeral 15 denotes a drain pipe attached so that an edge faces the inside. In this rainwater storage and infiltration facility, rainwater flowing from the surrounding ground surface through the water permeable cover 13 is removed by the dust removal device 1.
In step 2, relatively large dust can be removed and stored in the storage tank, and the water stored in the storage tank (container 9) can be effectively used as a water source in case of water cutoff or fire. Also,
Rainwater exceeding the allowable amount can be appropriately discharged from the drain pipe 15 to a drainage facility.

On the other hand, FIG. 4 shows a water-permeable roadbed structure in which the bags 2 are spread on the surface of the soil 16 that has been leveled and the road surface material 17 is laid on the upper surface thereof.

As described above, the construction method of the present invention can be performed in exactly the same manner as the conventional construction method, except that the recycled resources aggregate is filled in a bag made of a water-permeable sheet material. It is extremely practical. Of course,
Conventionally, a water-permeable sheet material is laid so as to surround a space filled with crushed stones or the like, but such laying can be omitted.

Therefore, when the bag is filled in the present invention, even if the internal recycled resources aggregates collide with each other at the pressure at which the bag is charged and new fine particles are generated, they leak to the outside of the bag ( As a result, the rainwater permeation function can be exerted continuously over a long period of time without closing the holes, slits, or fine voids of the rainwater permeated product. For example, when glass cullet crushed and polished to 0.2 to 20 mm is filled as it is, no scattering of glass powder or the like occurs at all, and there is no danger of causing respiratory disorders or damaging skin and safely and Can be filled quickly.

[Example of construction] Non-woven fabric [[Tekton 330
1], water permeability 1.7 × 10 ^-2 , pore distribution 0.15
0.5 mm, manufactured by RMMY (USA)]
× 300 mm bag, into which concrete waste (recycled particle size crushed stone, particle size range 0-40 mm, sieve passing weight percentage 0.4 mm 20)
%, 0.074 mm 7%, permeability coefficient 3 × 10 ^-3 )
0 kg was filled to obtain a filler. As the rainwater infiltration product, a cylindrical perforated PVC pipe (perforated diameter 20 mm, inner diameter 30
cm) was used. Then, similarly to the illustrated embodiment shown in FIG. 1, the rainwater infiltration product and the filler were installed.
The test result had a penetration of 220 l / h. 200 pp soil particles with a particle size of 2 mm or less in the same facility
Even when water was injected at a concentration of m, the amount of permeation did not decrease, and the recycled resource aggregate did not leak from the bag laid on the outer periphery and flowed into the permeation tank.

[0019]

As described above, the method of manufacturing the underground seepage facility for rainwater according to the present invention employs a bag made of a water-permeable sheet material in which recycled aggregate is sealed, instead of conventional crushed stones. It is highly practical because it is a simple method that can only be used. Moreover, when a bag made of a water-permeable sheet material is filled with the recycled resource aggregate, even if new fine particles are generated due to collision of the recycled resource aggregate, etc., these particles are formed outside the bag. Since the water does not leak into the rainwater, the pores, slits, and fine voids of the rainwater infiltration product are not blocked, and the permeability is not impaired. Can be. In addition, from the viewpoint of utilization of recycled resources, it can be used over most of the range having a wide range of particle size distribution, which contributes to promotion of the use of recycled resources. Furthermore, conventionally, since the glass cullet was filled as it was, the newly generated powdery fine particles scattered and caused respiratory tract damage, or caused adhesion to the skin to cause damage. However, the present invention can solve such a problem.

[Brief description of the drawings]

FIG. 1A is a perspective view illustrating an example of a bag used in the present invention, and FIG. 1B is a cross-sectional view illustrating an example of construction of an underground infiltration facility of the present invention.

FIG. 2 is a sectional view showing another construction example of the underground seepage facility of the present invention.

FIG. 3 is a sectional view showing another construction example of the underground seepage facility of the present invention.

FIG. 4 is a sectional view showing another construction example of the underground seepage facility of the present invention.

FIG. 5 is a cross-sectional view showing an example of a construction state of a conventional underground seepage facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Permeable sheet material 2 Bag body 3 Recycled resource aggregate 4 String material 5 Infiltration measure 6 Backfill soil 7 Infiltration trench 8 Storage infiltration measure 17 Road surface material

Claims (3)

[Claims] Claims: 1. When embedding a rainwater infiltration product for infiltrating rainwater into the ground, the outside of the product is filled with recycled resources aggregate in a bag made of a water-permeable sheet material. Characteristic construction method of rainwater infiltration facility. 2. A method for constructing a rainwater infiltration facility, comprising: laying a recycled resource aggregate in a bag made of a water-permeable sheet material on a soil surface, and laying a roadbed material on an upper surface thereof. 3. The method for constructing a rainwater infiltration facility according to claim 1, wherein the recycled resource aggregate contains glass cullet ground and polished to 0.2 to 20 mm.