JPH03271435A - Infiltration drainage device and washing method therefor - Google Patents

Abstract

PURPOSE:To maintain the function of infiltration by housing a pipe unit in an infiltration hole, filling external space around the infiltration hole with gravel, providing a manhole on the ground surface and internally so fitting a filter as to be detachable. CONSTITUTION:A pipe unit 2 is coaxially housed in an infiltration hole 1 along the axial center thereof, and external space around the infiltration hole 1 is filled with gravel 6 having a larger diameter than the diameter of a small hole 3a formed on the peripheral wall of a drain pipe 3. Then, a concrete bottom plate 7 is placed on the top of the hole 1 and a concrete manhole 8 is provided on the upper surface of the bottom plate 7. Then, the third filter 12 is so housed in the upper part of the drain pipe 3 as to be detachable, while the first and second filters 10 and 11 are so housed in the manhole 8 as to be detachable. Large dirts such as a dead leaf and a pebble carried together with rain drops are arrested with the filters 10 to 12 for removal. According to the aforesaid construction, the long-term function of infiltration can be maintained.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a seepage drainage device that drains rainwater or spring water on the ground surface by infiltrating it into a hole drilled in the ground, and a method for cleaning the seepage drainage device. The present invention relates to a cleaning method.

(Prior art) As a conventional technology, a penetration hole of a predetermined depth is drilled from the ground surface into the ground, and a long, cylindrical hole is formed in which a large number of small holes are formed in the peripheral wall deep in the axis of the penetration hole. The drain pipe is housed coaxially, the outer periphery of the seepage hole that surrounds the outer surface of the drain pipe is filled with gravel, and a large diameter and short manhole is provided on the ground surface that communicates with the top of the drain pipe. There was an infiltration drainage system with a removable filter.

(Problems to be Solved by the Invention) The above conventional method solves the problem of dead leaves flowing in with rainwater,
Large dust such as pebbles will be captured by the filter inside the manhole, but small dust such as dirt and sand will pass through the filter and flow into the drain pipe, and as one hour passes, the drain pipe and its outer surface will be trapped. The surrounding gravel gradually becomes clogged and its infiltration function decreases.

When the above-mentioned infiltration function deteriorates, the conventional structure cannot clean the drain pipe and the gravel surrounding the outer surface thereof, and the construction has to be redone, resulting in an increase in repair costs.

The object of the present invention is to obtain a novel infiltration and drainage device that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

In other words, there is a long cylindrical drain pipe with a penetration hole of a predetermined depth made from the ground surface into the ground and a large number of small holes formed in the surrounding wall, and a drain pipe that extends along the outside of the drain pipe. A pipe unit having a small diameter and long drain pipe whose lower end communicates with the lower end of the drain pipe is provided, and this pipe unit is housed coaxially in the axial center of the penetration hole and surrounds the outer surface of the pipe unit. The outer periphery of the seepage hole is filled with gravel, a large diameter and short manhole is provided on the ground surface that communicates with the top of the pipe unit, and at least a filter is provided inside the manhole between the manhole and the drain pipe. It is.

In addition, a discharge hose with a discharge nozzle that opens laterally connected to the tip is inserted into the drain pipe, and while supplying cleaning water to this discharge hose, the discharge hose is moved up and down within the drain pipe, and the drain is drained. The drain pipe and the gravel surrounding the outer periphery of the drain pipe are cleaned by suctioning and discharging water flowing down the lower part of the pipe to the outside through a drain pipe.

(Function) Since the present invention has the above structure, large dust particles are captured by the filter in the manhole, small dust particles pass through the filter and flow into the drain pipe, and the gravel on the outer periphery passes through the small hole of the drain pipe. It will be discharged towards the ground and seep into the underground.

In addition, when cleaning water is supplied to the discharge hose inserted into the drain pipe, the cleaning water discharged from the discharge nozzle is discharged toward the inner wall of the drain pipe, and the small holes formed in the inner wall and wall of the drain pipe are discharged. At the same time, the cleaning water discharged from the small holes also cleans the gravel surrounding the outer surface of the pipe unit.

Then, the small dust particles separated from the drain pipe and gravel flow down to the lower part of the drain pipe together with the washing water, and then are sucked and removed to the outside through the drain pipe.

(Example) Embodiments of the present invention will be described below based on the drawings.

In Fig. 1, 1 is a penetration hole opened in the center of the site of the steel tower, and this penetration hole 1 has a diameter of, for example, about 600 mm,
It is excavated with an earth auger to a depth of approximately 3500W11.

The depth of the penetration hole 1 is determined by the geology, and is set to a depth that reaches a stratum that has a penetration function, such as a gravel layer.

2 is a pipe unit accommodated in the penetration hole 1.

This pipe unit 2 includes a hard plastic drain pipe 3 having a large number of small holes 3a formed in its peripheral wall, and extends along the outside of the drain pipe 3, with a lower end communicating with the lower end of the drain pipe 3. It is integrally connected to a drain pipe 4 made of vinyl chloride.

More specifically, the drain pipe 3 has a spiral convex shape (not shown) formed on its peripheral wall to increase deformation strength in the axial direction, and has a diameter of about 200 m and a length of about 3000 m+.
It is closed and a bottom cover 3b is fitted to the lower end. This bottom cover 3b has a large number of small holes formed in its peripheral wall.

The drain pipe 4 has a diameter of about 6511W11 and a length of about 3000 m, is arranged parallel to the outside of the drain pipe 3, and is fastened to the drain pipe 3 at three points at the top and bottom with bands 5, and its lower end is connected to the bottom. It is connected to the side wall of the lid 3b. This drain pipe 4 is for inserting and removing a drain hose 27 of a drain pump 26, which will be described later.

Then, the pipe unit 2 is coaxially accommodated in the axial center of the penetration hole 1 described above, and then a small hole is formed in the peripheral wall of the drain pipe 3 at the outer periphery of the penetration hole 1 surrounding the outer surface of the pipe unit 2. Gravel 6 larger than the diameter of 3a is filled.

In addition, a concrete bottom plate 7 formed in the shape of a disc with a diameter of about 1000mm and a thickness of about 100wn is placed above the penetration hole 1.
A cylindrical concrete manhole 8 with a diameter of about 700 mm and a height of about 800 mm is placed on the top surface of the bottom plate 7.

The bottom plate 7 has a large-diameter hole and a small-diameter hole penetratingly formed in its axial center and outer circumference, and the upper end of the drain pipe 3 is fitted into the hole in the axial center to be connected to the bottom of the manhole 8. The manhole 8 is opened and the upper end of the drain pipe 4 is passed through the hole on the outer periphery.
The upper end of the drain pipe 4 is closed by removably covering the projecting end with a cap 9.

A third filter 12 formed into a cylindrical shape with a bottom and made of wire mesh is removably fitted into the upper part of the drain pipe 3, and is supported by a support rod 12b suspended and fixed to the axial center of the bottom surface.

12a is a handle for taking out.

Further, a second filter 11 and a first filter 10 are removably housed in the manhole 8.

The second filter 11 is formed of wire mesh into an inverted cup shape, and is removably mounted on the bottom plate 7 so as to face the upper surface of the drain pipe 3.

The first filter 10 is made of a flexible net bag, and is arranged along the inner surface of the manhole 8 and the outer circumferential surface of the second filter 11. It is crimped and locked in the groove of the.

Here, the mesh of each of the above filters is the first filter 1
0, the mesh gradually becomes smaller toward the second filter 11 and the third filter 12.

A ring-shaped cover frame 14 is attached to the upper edge of the manhole 8, and a grid-shaped cover, that is, a grating 15, is removably mounted on the cover frame 14.

Note that 16 is a concrete floor, and 15 is a grating.
It slopes down towards the top.

Next, the functions and effects of the above embodiment will be explained.

Rainwater that has fallen onto the concrete floor 16 flows into the manhole 8 from the grating 15 and passes through the first filter 10,
The water passes through the second filter 11 and the third filter 12, flows into the drain pipe 3, flows out from the small hole 3a of the drain pipe 3 toward the gravel 6, and then permeates into the ground and is drained.

In this case, large dust particles such as dead leaves and pebbles that flow in with rainwater are captured by the first filter 10, second filter 11, and third filter in order of size.

The first to third filters 10 to 12 are taken out from the manhole 8 and drain pipe 3 as necessary to remove captured dust and are cleaned.

In addition, the small dust that has passed through each of the first filter 10 to the third filter 12 flows into the drain pipe 3 and adheres to the small hole 3a of the drain pipe 3 and the gravel 6 surrounding the outside thereof, and these gradually It will become clogged and the infiltration function will be reduced.

If the above-mentioned permeation function deteriorates, clean it as follows.

First, the grating 15 is removed to open the top surface of the manhole 8, and then the first filter 10 and the second filter 1 are removed.
1. After taking out the third filter 12 to the outside one after another, remove the cap 9 and open the upper part of the drain pipe 4.

Next, as shown in FIG. 2, the discharge device 21 connected to the discharge pump 20 is inserted into the drain pipe 3, and the lower part of the drain hose 27 connected to the drain pump 26 is inserted into the drain pipe 4. Its lower end reaches the bottom cover 3b.

The discharge device 21 has a discharge nozzle 2 that opens toward the inner wall of the drain pipe 3 at the tip of a flexible discharge hose 22.
3 is installed. This discharge nozzle 23 is connected to the discharge hose 2
It is designed to rotate around a horizontal axis by the water pressure of the washing water flowing through the interior.

Note that 24 is a guide rod 25 that slides against the inner wall of the drain pipe 3 and positions the discharge nozzle 23 in a predetermined direction.
is a roller that supports the discharge hose 22 in a vertically movable manner.

Then, each pump 2o, 26 is started, and the discharge hose 22
The discharge nozzle 23 is moved up and down via.

Then, the cleaning water will flow from the discharge nozzle 23 to the drain pipe 3.
This ejected water removes small dust adhering to the drain pipe 3 and gravel 6, and flows down to the lower part of the drain pipe 3 together with the cleaning water. The fallen dust and washing water are discharged to the outside by the drain hose 27, thereby cleaning the drain pipe 3 and the gravel 6 and restoring the infiltration function.

Note that the drain pipe 3 may be formed of a wire mesh.

(Effects of the Invention) As is clear from the above description, the present invention can smoothly capture and remove large dust such as dead leaves and pebbles that flow in with rainwater, and also allows the dust to pass through a filter and be removed from the drain pipe. Small dust adhering to the gravel surrounding the outer surface can be easily removed, resulting in the effect that the permeation function can be maintained satisfactorily over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing the drain pipe and gravel being cleaned. 1: Penetration hole, 2: Pipe unit, 3: Drain pipe,
3a: Small hole, 3b: Bottom cover, 4: Drain pipe, 5: Band, 6
: Gravel, 7: Bottom plate, 8: Manhole, 9: Cap, 1
0: First filter, 11: Second filter, 12: Third filter, 13: Ring band, 14: Lid frame, 15: Grating, 16: Earthen floor concrete, 20: Discharge pump, 21: Discharge device, 22: Discharge hose. 23: Discharge nozzle, 24 Guide rod, 25: Roller, 2
6: Drain pump, 27: Drain hose. Figure 1 Application agent Hisashi Matsumoto

Claims (1)

[Claims] 1. Drilling a penetration hole of a predetermined depth from the ground surface into the ground,
A long, cylindrical drain pipe with a large number of small holes formed in the peripheral wall, and a small diameter, long drain pipe that extends along the outside of the drain pipe and has a lower end communicating with the lower end of the drain pipe. The pipe unit is housed coaxially in the axial center of the permeation hole, and the outer periphery of the permeation hole that surrounds the outer surface of the pipe unit is filled with gravel, and the pipe unit is placed on the ground surface. A seepage drainage device characterized in that a large diameter and short manhole communicating with the upper part is provided, and a filter is provided in at least the manhole between the manhole and the drain pipe so that a filter can be attached thereto. 2. Insert the discharge hose, which has a discharge nozzle that opens laterally at the tip, into the drain pipe, and move the discharge hose up and down within the drain pipe while supplying cleaning water to the discharge hose. 2. The method of cleaning a seepage drainage device according to claim 1, wherein the water flowing down to the lower part of the pipe is sucked and discharged to the outside through a drain pipe.