JPH02225735A - Constructing underground infiltration device - Google Patents

Abstract

PURPOSE:To make easy infiltration of water possible by constructing an infiltration tank by alternating execution of ground excavation and assembling of ring bodies, and by installing a sedimentation tank thereon and a water- permeable pipe body. CONSTITUTION:A collecting pipe 15, communication with an aboveground collecting valve, is installed to a sedimentation tank 1. An infiltration tank 2 is made from liner plates 21 and crushed stones 27 and coarse sand 28 are provided therein and laid respectively in the upper layer and in the lower layer. The liner plate 21 is made from a water-permeable drain plate 22, which is superimposed over a corrugated plate 23 and is bent together toward the corrugated plate-side into circular arc, and weep holes 24 and a joining frame 26 are provided to the corrugated plate. To a filtering pipe, a band 31 for fixing the pipe to a floor board 11 and a filtering cloth 32 are provided. In installing the device, a water-permeable sheet is stretched over the natural ground. Then a ring is constructed of a number of the liner plates 21 that are assembled together, and the infiltration tank is installed by the inverted lining method. Thereby clogging and breakdown at the infiltration surface of the natural ground can be prevented.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an underground infiltration device for minimizing rainwater runoff outside the area by allowing rainwater to infiltrate into the ground without directly guiding it to a sewer pipe. It is something.

<Conventional technology> Rainwater originally soaked into the ground, but as urbanization progresses and the ground surface is covered with concrete, asphalt, etc., the amount of rainwater that seeps into the ground has decreased.

As a result, problems have arisen, such as an increase in the amount of rainwater runoff into sewers, water flowing into rivers and the like in a short period of time immediately after rainfall, and a decrease in the amount of groundwater, causing ground subsidence.

In order to deal with these problems, underground penetration methods are being implemented.

In this construction method, a device as shown in FIG. 5 is used.

That is, the device has a structure in which a cylindrical cylinder a is buried in the ground, a PVC pipe that takes in rainwater from the ground h is introduced into the cylinder a, and the water permeates into a permeation part C.

<Problems to be Solved by the Present Invention> The conventional underground penetration device described above has the following problems.

(F) Conventional underground infiltration equipment excavates the ground using bentonite or earth retention when burying the cylinder a underground.

However, when bentonite is used, the bentonite flows into the gaps between the permeable layers of the surrounding ground, clogging the permeable surface and reducing the amount of water permeated, and the amount of permeated cannot be completely recovered even after cleaning. It becomes a national disaster.

Furthermore, when earth retention is used, the aggregate structure of the soil on the permeation surface of the surrounding ground is destroyed, and the amount of water permeation also decreases.

Since the structure is such that water is introduced directly from the water collection well at the entrance to the infiltration section C through a PVC pipe, filtration of water is necessary.

This causes clogging of the penetration surface.

<Purpose of the present invention> The present invention was made to solve the above-mentioned problems, and is intended to prevent clogging and destruction of the permeation surface of other mountains, and to provide an underground structure that allows water to penetrate efficiently. The purpose is to provide a construction method for an infiltration device.

<Structure of the present invention> Hereinafter, an embodiment of the present invention will be described with reference to the drawings.6 <A> Sedimentation tank (Fig. 1) The sedimentation tank l is a cylindrical straight plate on the upper surface of the floor plate 11. ! ! , 12 are fixed, and a diagonal wall 13 whose diameter gradually decreases toward the top is fixed to the upper end of the straight wall 12.

Floorboard] 1. Straight wall 12. [Slanted wall] 3 shall be made of concrete, etc., and shall have a structure that will not leak water into the surrounding ground.

A lid 14 that can be opened and closed is attached to the upper end of the slanted wall 13.

Further, a water collection pipe 15 is attached to the sedimentation tank 1, which communicates the water collection well above the ground with the inside of the sedimentation tank 1.

<Port> Osmosis tank (Fig. 1) The osmosis tank 2 is constructed by assembling the liner plate 21 into a cylindrical shape.
” Attach the open end of the two parts to the lower surface of the floor plate 11 of the settling tank 1,
At the lower open end, there are 27 pieces of crushed stone in the upper layer and 2 pieces of coarse sand in the lower layer.
8 was installed.

<C> Liner plate (Fig. 1.2) As shown in Fig. 2, the liner plate 21 is made of plywood made by laminating a drainage board 22 and a corrugated board 23 together, and is formed into an arc shape of a predetermined diameter on the corrugated board 23 side. It is bent.

The drainage plate 22 is located on the outer peripheral side of the permeation tank 2, and is made of a material that has water permeability.

For example, a known styro-drain (manufactured by Mitsubishi Yoka Bardische Co., Ltd.), which is made by hardening foamed polyethylene particles with a special adhesive, is used.

This steel O drain is lightweight, easy to handle, and has a hydraulic conductivity similar to that of small gravel (k = 2.7-3, 5 c
m/sec) and is also resistant to compression.

Furthermore, the water that has permeated through one side of the styro-drain is widely dispersed and evenly discharged when it is discharged from the other side.

Next, the corrugated plate 23 is for reinforcing the drain plate 22, and is made of a corrugated steel plate or the like.

A drainage hole 24 is provided in this corrugated plate 23, and a connecting frame 26 having a connecting hole 25 is attached to the peripheral edge thereof.

In this case, it is preferable to insert the bolt 29 into the connecting hole 25 and fasten it with a nut.

Kuji〉Filtration vibrator (Figure 1) The filtering vibe 3 is a perforated tubular body having water permeability.

The filtration vibrator 3 is detachably attached vertically to the floor plate 11 of the sedimentation tank 1 using a fixing band 31 or the like, so that the inside of the sedimentation tank 1 and the inside of the permeation tank 2 are communicated with each other.

When installing, it is desirable that the upper end of the filtering vibrator 3 be raised up from the floor plate 11 by about 60 degrees.

Further, the lower end of the filtering vibrator 3 is closed, the upper end is open, and a filter cloth 32 is attached to the inner surface of the vibrator.

At this time, the filter cloth 32 is also pasted on the outer surface of the vibrator on the raised part of the filter vibrator 3 on the floor plate 11, and the folded part 33
shall be.

Note that if some clogging material adheres to the filter cloth 32 and the water permeability rate decreases, the fixing band 31 may be removed, the filtering vibrator 3 may be removed, and the filter cloth 32 may be replaced.

Construction Method> (Fig. 2) Next, a reverse winding construction method for the above-mentioned underground infiltration device will be explained.

First, the other thread is excavated by one ring of the liner plate 21.

When excavating, care should be taken to protect the natural conditions of the mountain as much as possible.

Next, a permeable sheet (not shown) is placed on the permeable side of the ground to prevent fine particles from flowing in.

Next, the liner plate 21 is installed on the permeation surface of the other mountain,
One ring is assembled by connecting the left and right liner plates 21 to each other.

Next, the ground is excavated by one ring below the ring, and the liner plate 21 is assembled in a ring shape in the same manner, and the upper and lower rings are connected.

At this time, the L portion ring does not fall due to friction with the ground, so the lower ring can be assembled.

After assembling the liner plate 21 to a predetermined depth and constructing the infiltration tank 2 using the same method, sand 28 is placed in the lower layer and crushed stone 27 is added to the upper layer on the floor of the ground at the lower end of the infiltration tank 2.
Lay down.

At this time, immediately after excavation is completed, spread sand 28 or the like and walk on it so as not to compact the floor of the 5th earth with your feet.

At the upper end of the top ring, there is a filtration vibe 3 and a water collection pipe 15.
Sedimentation tank 1 with
Only the upper Ij14 is exposed above the ground.

Further, the above-ground end of the water collection pipe 15 is connected to a water collection valve or the like.

In addition, although the above is a case where a different mountain is excavated in units of one ring, the excavation of the ground may be performed in units of liner plates.

Effect of the present invention> Next, the operation of the present invention will be explained.

Rainwater is collected at the water collection valve at the ground and flows through the water collection pipe 1.
5 into the settling tank 1.

When the water level in the settling tank 1 is lower than the upper end of the filtration vibrator 3, the water flows into the vibrator from the side surface of the filtration vibrator 3.

At this time, since the folded part 33 of the filter cloth 32 is attached to the outer surface of the filtering vibrator 3, the clogging substances in the water are filtered and remain attached to the folded part 33.

Further, larger clogging substances remain as sediments in the settling tank 1.

Furthermore, when the amount of rainfall increases, the filtering vibration 3
If the water only flows in from the side of the sedimentation tank 1, the water will overflow from inside the sedimentation tank 1 and flow out onto the ground. Therefore, when the water level reaches a certain level, it is configured to flow in from the upper open end of the filtration vibrator 3.

However, since the water flowing in from the upper open end is also filtered by the filter cloth 32 attached to the inner surface of the filter vibrator 3, only water from which clogging substances have been removed will ultimately enter the permeation tank 2. There will be an influx.

It is formed.

Therefore, when the water in the infiltration tank 2 is discharged to another mountain,
Distributed widely and evenly.

Therefore, the permeable surface of the ground can be prevented from being destroyed.

Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

Kui> Conventional underground infiltration equipment uses bentonite or earth retaining material to excavate the ground when burying the cylinder underground, resulting in clogging or destruction of the infiltration surface, resulting in water infiltration. This will reduce the amount.

In contrast, in the present invention, the infiltration tank can be constructed by the reverse winding method.

Therefore, during construction, bentonite and earth retention are not required, clogging and destruction of the infiltration surface can be prevented, and water can infiltrate efficiently.

5. The underground seepage system of the Congregation Song Dynasty has a structure in which water is conveyed directly from the above-ground water collection well to the seepage area through PVC pipes, which results in insufficient water filtration and causes clogging of the seepage surface.

However, in the present invention, a filter pipe is provided, and after the ground rainwater is sufficiently filtered, it can be drained to the infiltration surface.

Therefore, clogging of the permeation surface can be reliably prevented and water can be permeated efficiently.

(c) The drainage plate of the liner plate of the present invention is made of a material having water permeability and uniform drainage properties, such as, for example, a stainless steel drain.

Therefore, when the water in the infiltration tank is discharged to the earth, it is widely dispersed and discharged evenly.

Therefore, it is possible to prevent the permeation surfaces of other mountains from being destroyed.

(2) When the filter cloth of the filtration pipe becomes clogged, the filtration pipe can be removed and replaced easily.

Therefore, water can always be sufficiently filtered.

Kuho〉A corrugated plate is attached to the inner peripheral surface of the liner plate.

Therefore, the strength of the liner plate is improved, and it is possible to construct a permeation tank that can sufficiently withstand the pressure of other parts.

Kube〉By using styro drain on the drainage board,
A liner plate that is lightweight, easy to handle, and has good compression properties can be obtained.

Furthermore, it also serves as a cushioning material.

<G> Since the sedimentation tank and the permeation tank are located one above the other, the area occupied by the entire device can be reduced.

[Brief explanation of the drawing]

Fig. 1 2 An explanatory diagram of an embodiment of the device of the present invention Fig. 2: An explanatory diagram of the reverse winding construction method Fig. 3 An explanatory diagram of the Niliner plate 4th picture: An explanatory diagram showing the action Explanatory diagrams Figure 1, 14"i.

Claims (1)

[Claims] (1) In the method of constructing an underground infiltration device that is buried underground and allows surface water to infiltrate into the ground, the ground is excavated, and inside the excavation hole, the outer periphery is formed with a perforated drainage plate, and the inner periphery is After assembling arc-shaped liner plates made of perforated corrugated plates to form a ring body, excavating the ground and assembling the ring body alternately, and constructing a cylindrical infiltration tank to a predetermined depth. A sedimentation tank with no water permeability is attached to the upper end of this infiltration tank with a collection pipe that takes in water above ground, and the inside of this sedimentation tank and the inside of the infiltration tank are communicated, and the lower end is closed and a filter cloth is installed. A method of constructing an underground infiltration device, characterized by providing a water-permeable pipe body attached thereto.