JPH09242160A - Rainwater permeating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make handling easy by a method wherein a rainwater storage space for storing rainwater and letting the rainwater permeate into the ground is formed around and under a rainwater taking space, and the rainwater taking space and the rainwater storage space are made to communicate with each other with slits or the like. SOLUTION: A lower member 1b surrounded with a water-permeating sheet 3b made of a nonwoven fabric or the like of the rainwater permeating apparatus 1 is placed at the inside of an excavated hole formed in the ground 6. An upper member 1a surrounded with a water-permeating sheet 3a of the rainwater permeating apparatus 1 is placed on the lower member 1b so that its upper surface becomes almost flush with the ground surface. Then, filling-back is made with soil on the periphery and the upside of the water-permeating sheets 3a and 3b. Rainwater taken into the rainwater taking space 11 of the rainwater permeating apparatus 1 permeates into the surrounding ground 6 from the periphery including the bottom of the rainwater permeating apparatus 1 through rainwater storage spaces 12a and 12b. Dirt flown into the rainwater taking space 11 together with the rainwater is caught at slits 15a and removed from an opening at the upper part of the rainwater taking space 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater infiltration device used to infiltrate rainwater into the ground.

[0002]

2. Description of the Related Art In recent years, with the progress of pavement on the ground surface and an increase in the amount of groundwater pumped up, the groundwater level in urban areas has declined remarkably, and conversely, rainwater has penetrated into the underground. Without flowing into sewage without increasing the required sewage treatment capacity and sewage treatment cost, the problem has been regarded as a problem.

By the way, rainwater permeation equipment for permeating rainwater underground has been put into practical use for the purpose of maintaining the groundwater level and reducing the amount of sewage treatment. One example is shown in FIG. This rainwater infiltration facility uses rainwater infiltration mast 7, and has a large number of through holes 72 formed in the periphery and a bottom portion 73.
Opened, synthetic resin cylindrical rainwater penetration body 71
When burying the soil 6 in the ground 6, first, sand 5 is formed at the bottom of the excavation hole formed by excavating the surrounding ground 6 to a predetermined range and depth.
And a water-permeable sheet 31 made of a non-woven fabric or the like that prevents the intrusion of earth and sand along the inner surface of the excavation hole including the upper surface of the sand 5.
Next, the crushed stone 4 is laid on the water-permeable sheet 31 (inside) to a predetermined thickness to allow at least rainwater to penetrate.
The water permeable sheet 72 is arranged in the portion where the bottom portion 73 of 1 is located, and the rainwater permeation main body 71 is installed on the upper surface of the water permeation sheet 72 so that its upper surface matches the ground surface, and then the rainwater permeation main body 71 It is constructed by filling the surroundings with crushed stone 4 to a predetermined height, disposing a water permeable sheet 33 on the upper surface thereof, and backfilling the water permeable sheet 33 with any soil. A lid 75 is arranged on the upper part of the main body 71 for rainwater penetration, and rainwater for introducing rainwater into the main body 71 for rainwater penetration at the time of construction of rainwater penetration equipment at an appropriate position in the middle part. Introducing pipe (not shown), if necessary, above the rainwater pipe,
A rainwater discharge pipe (not shown) for discharging excess rainwater from the inside of the main body 71 is connected.

[0004]

The rainwater infiltration equipment is effective for maintaining the groundwater level and reducing the amount of sewage treatment. However, in order to enhance its effectiveness, a large number of rainwater infiltration equipments are required. Need to be distributed. However, since the conventional rainwater infiltration equipment uses heavy crushed stone or sand, it is difficult to handle the material,
There was a problem that construction work became hard work. Also,
Since most of the work is done on-site, the construction accuracy is not constant and the work efficiency is low.

In view of the above problems, the present invention provides a rainwater infiltration device which has a small number of parts, is easy to handle, can reduce the work load of construction work, and can improve the construction accuracy and work efficiency. The purpose is to do.

[0006]

In order to achieve the above object, the rainwater infiltration device of the present invention forms a rainwater introduction space into which rainwater is introduced, and introduces rainwater around and below the rainwater introduction space. Stores rainwater introduced into the space,
A feature is that a rainwater storage space for allowing rainwater to permeate is formed in the ground, and the rainwater introduction space and the rainwater storage space are connected by a slit or a small hole.

This rainwater infiltration device, which is used in place of the conventional crushed stone and sand and rainwater infiltration masu, has a small number of parts and is easy to handle. Therefore, the work load of construction work can be reduced, and the construction accuracy and work The efficiency can be improved. In addition, since this rainwater infiltration device connects the rainwater introduction space and the rainwater storage space by slits or small holes, it is possible to prevent dust that has flown into the rainwater introduction space together with rainwater from entering the rainwater storage space. The dust trapped in the slits or small holes can be removed from the opening formed above the rainwater introduction space.

In this case, the rainwater permeation device is divided into a rainwater introduction space and a rainwater storage space which is formed around the rainwater introduction space, and a lower member which defines a rainwater storage space formed below the rainwater introduction space. It can be composed of and.

Thus, by appropriately selecting the shape (height) of the lower member, it is possible to easily provide a rainwater infiltration device adapted to the amount of rainwater introduced, the properties of the ground, and the like.

Further, the rainwater storage space can be partitioned by the ribs, and at least the rib for partitioning the rainwater storage space formed around the rainwater introduction space can be provided with a cutout portion through which the rainwater flows.

As a result, the amount of rainwater stored in the rainwater storage space partitioned by the ribs can be made uniform while improving the strength of the rainwater infiltration device.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a rainwater infiltration device of the present invention will be described below with reference to the drawings.

FIG. 1 shows a rainwater infiltration facility using the rainwater infiltration apparatus of the present invention. This rainwater infiltration facility uses the synthetic resin rainwater infiltration device 1 shown in FIGS. 2 to 5. When the rainwater infiltration device 1 is embedded in the ground 6, first, the surrounding ground 6 is covered within a predetermined range and A lower member 1b of a rainwater infiltration device 1 around which a water-permeable sheet 3b made of non-woven fabric or the like for preventing invasion of earth and sand is arranged as needed is installed in an excavation hole formed by excavating to a depth above it. Water-permeable sheet 3a similar to
By installing the upper member 1a of the rainwater infiltration device 1 arranged around the above so that the upper surface thereof substantially coincides with the ground surface, and by backfilling the peripheries of and above the water permeable sheets 3a and 3b with arbitrary soil. It was built. Water-permeable sheet 3a, 3
As the non-woven fabric used for b, for example, a thickness of 2 to 10 m
A non-woven fabric made of synthetic fiber having m and a weight of 50 to 200 g / m 2 is preferable in terms of the performance of preventing intrusion of earth and sand from the surrounding ground 6, the passability of rainwater, and the corrosion resistance. In addition, the rainwater introduction space 1 formed in the central portion of the upper member 1a of the rainwater infiltration device 1
1, a rainwater introduction pipe (not shown) for introducing rainwater into the rainwater introduction space 11 when constructing a rainwater infiltration facility.
And, if necessary, above the rainwater introduction pipe,
A rainwater discharge pipe (not shown) for discharging excess rainwater from the rainwater introduction space 11 is communicated. Therefore, the upper member 1a of the rainwater infiltration device 1 is formed with a through hole (not shown) for inserting the rainwater introduction pipe and the rainwater discharge pipe.

The rainwater infiltration device 1 can adopt various forms, but basically, it forms a rainwater introduction space 11 into which rainwater is introduced in the central portion, and at the same time, the rainwater introduction space 1 is formed.
Rainwater storage space 12 that stores the rainwater introduced into the rainwater introduction space 11 around and below 1 and permeates the rainwater into the ground
a, 12b are formed, the rainwater introducing space 11 and the rainwater storing spaces 12a, 12b are communicated with each other by a slit or a small hole 15a, and an opening is formed above the rainwater introducing space 11 to close the opening. Is configured to be installed. As a result, the rainwater permeation device 1 can store the rainwater introduced into the rainwater introduction space 11 into the rainwater storage space 12
Through the a and 12b, while permeating into the surrounding ground 6 from the peripheral surface including the bottom surface of the rainwater permeation device 1, the dust that has flown into the rainwater introduction space 11 together with the rainwater is captured in the slits or small holes 15a. It can be removed from the opening formed above the rainwater introduction space 11. In this case, the rainwater infiltration device 1 is configured to have a strength capable of withstanding the earth pressure received from the surrounding ground 6.

The rainwater infiltration device 1 made of synthetic resin shown in FIGS. 2 to 5 has an upper member 1a for defining a rainwater introduction space 11 and a rainwater storage space 12a formed around the rainwater introduction space.
Rainwater storage space 12b formed below the rainwater introduction space 11
And a lower member 1b for partitioning.

As shown in FIGS. 2 to 4, the upper member 1a divides the rainwater introduction space 11 and the rainwater storage space 12a into a partition wall 1a.
4a and partition 1a with slit 1
5a is formed to form a rainwater introduction space 11 and a rainwater storage space 12
Further, an opening is formed above the rainwater introducing space 11, and a lid member 13 for closing the opening is installed. The area of the opening formed above the rainwater introduction space 11 is made smaller than the cross-sectional area of the upper member 1a so that the rainwater infiltration device 1 is exposed to the ground as little as possible. The width of the slit 15a is
In order to prevent dust that has flowed into the rainwater introduction space 11 together with rainwater from entering the rainwater storage space 12a,
It is preferable to set the size to about 2.0 cm. An outer peripheral wall 16a is formed on the outer periphery of the rainwater storage space 12a, an upper wall 18a is formed on the upper side, and a large number of through holes 17a, 19a are formed in the outer peripheral wall 16a and the upper wall 18a. The areas of the through holes 17a and 19a are set to prevent the water permeable sheet 3a from entering the upper member 1a due to earth pressure.
It is preferable to set the size to about 1.5 to 15 cm 2. The rainwater storage space 12a is partitioned by the ribs 20a, and the ribs 20a form cutout portions 21a through which rainwater flows. Regardless of which part of the rib 20a is provided with this cutout portion 21a, rainwater flows through the cutout portion 21a and each rib 20a
Although it flows into the rainwater storage space 12a defined by a, it is preferably formed below the rib 20a. Further, as the shape of the excision portion 21a, in addition to the slit whose lower end is open as shown in this example, any shape such as a long hole or a small hole can be adopted. By forming the cutout portion 21a on the rib 20a, the amount of rainwater stored in the rainwater storage space 12a partitioned by the rib 20a can be quickly equalized, but is stored in the rainwater storage space 12a. Since the rainwater is made uniform by the rainwater flowing through the water permeable sheet 3b or the like arranged between the upper member 1a and the lower member 1b of the rainwater infiltration device 1, this cutout portion 21
a can be omitted.

As shown in FIG. 5, the lower member 1b has an outer peripheral wall 16b formed on the outer periphery of the rainwater storage space 12b, and partitions the rainwater storage space 12b by ribs 20b. In this case, the height H of the lower member 1b can be set arbitrarily, and if necessary, by preparing a plurality of types of lower members 1b having different heights H, the amount of rainwater to be introduced and the ground It is possible to easily provide the rainwater infiltration device 1 adapted to the properties of the above. Further, the upper bottom surface and the lower bottom surface of the lower member 1b may be bottomless or bottomed, and in the case of bottomed, a large number of through holes are formed. Further, in the case of having a bottom, the bottom may be formed integrally with the lower member 1b or may be formed separately. Further, more preferably, the rib 20b is provided on the outer peripheral wall 16b of the lower member 1b.
Also, by forming a cutout portion such as a small hole (not shown), rainwater can penetrate into the surrounding ground 6 through the cutout portion.

Further, the upper member 1a of the rainwater infiltration device shown in FIG. 6 is such that the rainwater storage space 12a is partitioned by the ribs 20a formed in a radial shape, and other configurations are shown in FIGS. The upper member 1a of the rainwater infiltration device 1 shown
Is the same as

In addition, the upper member 1a of the rainwater infiltration device shown in FIG. 7 is configured such that the entire shape of the rainwater infiltration device is formed in a cylindrical shape and the rainwater storage space 12a is partitioned by the ribs 20a formed radially. Other configurations are the upper member 1a of the rainwater infiltration device 1 shown in FIGS. 2 to 4.
Is the same as In the case of this example, it goes without saying that the entire lower member has a cylindrical shape.

Incidentally, in the upper member 1a of the rainwater permeation apparatus shown in FIGS. 6 and 7, either the partition wall 14a or the outer peripheral wall 16a for partitioning the rainwater introduction space 11 and the rainwater storage space 12a may be omitted. Yes, of these, partition wall 14
When a is omitted, the width of the slit 15a is defined by the inner peripheral edge of the adjacent rib 20a.

By the way, the configuration of the rainwater infiltration apparatus 1 is shown in FIG.
The shape of the rainwater infiltration device 1 is not limited to that shown in FIG.
The rainwater permeation apparatus 1 can be divided into any shape, such as a circular column in a plane, and can be divided into any number and at any position. Any of these can be adopted. When the rainwater infiltration device 1 is divided into a plurality of blocks and formed, a locking portion that locks adjacent blocks of the rainwater infiltration device 1 to each other, for example, a locking protrusion and a locking hole, is provided. It can be formed on the joint surface of the rainwater infiltration device 1, whereby the rainwater infiltration device 1 formed by being divided into a plurality of blocks can be accurately installed in the excavation hole in an integrated state.

[0022]

According to the rainwater infiltration apparatus of the present invention, when constructing a rainwater infiltration facility, basically, a heavy material such as crushed stone or sand is not required, the number of parts is small, and handling is easy. Therefore, the work load of the construction work can be reduced, and since the existing members are used, the construction accuracy and work efficiency can be improved. In addition, since this rainwater infiltration device connects the rainwater introduction space and the rainwater storage space by slits or small holes, it is possible to prevent dust that has flown into the rainwater introduction space together with rainwater from entering the rainwater storage space. The dust captured in the slits or small holes can be removed from the opening formed above the rainwater introducing space, and maintenance / inspection can be easily performed.

Further, by configuring the rainwater infiltration device with the upper member and the lower member, the shape (height) of the lower member is appropriately selected to adapt to the amount of rainwater introduced, the properties of the ground, and the like. A rainwater infiltration device can be easily provided.

Further, the rainwater storage space is divided by the ribs, and the cutout portion through which the rainwater flows is formed in the ribs to improve the strength of the rainwater infiltration device and to store the rainwater storage space in the rainwater storage space. The amount of rainwater generated can be made uniform, and rainwater can efficiently penetrate into the ground.

[Brief description of drawings]

FIG. 1 is a structural diagram showing a rainwater infiltration facility using the rainwater infiltration device of the present invention.

FIG. 2 is a partially cutaway front view showing an upper member of the rainwater infiltration device of the present invention.

FIG. 3 is a sectional view taken along line II of FIG. 2;

FIG. 4 shows an upper member of the rainwater infiltration device of the present invention,
(A) is the top view which fractured | ruptured a part of upper wall, (b) is a bottom view.

FIG. 5 shows a lower member of the rainwater infiltration device of the present invention,
(A) is a plan view, (b) is a side view, (c) is (a) II.
FIG. 11 is a cross-sectional view taken along the line II.

FIG. 6 is a transverse cross-sectional view of a first modified example of the upper member of the rainwater infiltration device of the present invention at an intermediate position.

FIG. 7 is a transverse cross-sectional view of an intermediate position showing the second modified example.

FIG. 8 is a structural diagram showing a conventional rainwater infiltration facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rainwater infiltration apparatus 1a Upper member 1b Lower member 11 Rainwater introduction space 12a Rainwater storage space 12b Rainwater storage space 15a Slit 20a Rib 20b Rib 21a Excision part 3a Water-permeable sheet 3b Water-permeable sheet 6 Ground

Claims (3)

[Claims] 1. Rainwater that forms a rainwater introduction space into which rainwater is introduced in the central portion, stores rainwater introduced into the rainwater introduction space around and below the rainwater introduction space, and allows rainwater to penetrate into the ground. A rainwater permeation device, characterized in that a storage space is formed, and the rainwater introduction space and the rainwater storage space are communicated by a slit or a small hole. 2. A rainwater permeation apparatus comprising: a rainwater introduction space and an upper member that defines a rainwater storage space formed around the rainwater introduction space; and a lower member that defines a rainwater storage space formed below the rainwater introduction space. It has comprised, The rainwater infiltration apparatus of Claim 1 characterized by the above-mentioned. 3. The rainwater storage space is partitioned by ribs, and a cutout portion for flowing rainwater is formed on at least the ribs defining the rainwater storage space formed around the rainwater introduction space. 2. The rainwater infiltration device described in 2.