JPH0841956A - Drain infiltrating structure - Google Patents

Abstract

PURPOSE:To provide desirable infiltrating efficiency even in a road and the earth paved with concrete without the fear of generating a landslide even by forming a waterway in the soil and moreover enable easy construction. CONSTITUTION:Trench drain infiltrating structure has a crushed stone layer 3 filled in a trench formed in the earth with the paved surface, and a conduit pipe 1 provided in such a way as to be surrounded by the crushed stone layer 3 in the trench and extended horizontally. The conduit pipe 1 has infiltrating holes 11 formed to infiltrate drain toward the inside of the crushed stone layer 3, and a vent pipe 2 with vent holes formed is provided above the conduit pipe 1. A sand layer 7 is provided on the upper face of the crushed stone layer 3 through a net 5, and water catchment way blocks with opening parts formed at the bottom face are provided on the sand layer 7. The drain inflow ports 15 of the conduit pipe 1 are opened above the sand layer 3 in the water catchment way blocks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage infiltration structure,
In particular, the present invention relates to a technique for preventing rainwater from permeating the ground or roads paved with concrete or asphalt to prevent depletion of the ground.

[0002]

2. Description of the Related Art Conventionally, as a technique for infiltrating drainage such as rainwater into the ground, when the ground surface is paved with concrete, asphalt, etc., (1) vertical hole infiltration method,
(2) Perforated U-groove method, (3) Water-permeable pavement, block method, etc. are known. If the ground surface is bare,
Known methods include (1) a method of burying a perforated pipe, (2) a trench groove method, (3) a seepage pond, a regulating pond method, and the like.

By the way, in the above-mentioned vertical hole infiltration method, a crushed stone layer is formed in the ground, a bottomless manhole is installed on this, and a drainage pipe is connected to the manhole to form a drainage pipe. The rainwater that flows into the manhole from the ground penetrates into the ground through a crushed stone layer.

Further, in the trench infiltration method, a groove is dug along a predetermined excavation line, a water guiding pipe is arranged in the groove, and crushed stone is filled around the water guiding pipe. It is covered with backfill soil.

(3) The water-permeable block pavement method is to lay a block having fine holes in a place such as a sidewalk where gravity is not applied, and allow rainwater to penetrate into the ground through these fine holes.

[0006]

However, in the vertical hole infiltration method, when the volume of the manhole is small, a large amount of water is concentrated in one place, so that the water channel (mizumichi) expanded into the soil. ) Can be done. When a waterway was formed relatively close to the slope, the soil flowed out, causing a landslide.

Further, the permeable block pavement method has a property that it is brittle because the block is porous, and it cannot be laid in a place where a heavy object enters and leaves like an automobile. It was Further, even if rainwater permeates through the holes of the block into the ground, the permeation capacity is limited because the holes are minute. Therefore, it has been practiced to design the ditch so that water exceeding the permeation capacity can flow into the ditch, and to discharge the water from the ditch to a sewer pipe or the like. However, in this case, most of the water flowed into the gutter, and the penetration efficiency into the ground was extremely poor.

Also, in the trench infiltration method, according to rainwater infiltration experimental data from the Ministry of Construction, etc., it is difficult to form a wide water channel in the soil, especially when the soil is the Kanto loam layer. However, the surface of the trench must be kept in contact with the atmosphere so that the inside of the trench will not be in an airlock state, so the ground could not be paved with concrete or the like. That is, the trench infiltration method could not be adopted when paving the ground surface. Further, according to the trench infiltration method, since the trench surface layer is kept in contact with the atmosphere, a vast site is required, and it is practically impossible to adopt it in a small site.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and enables a trench infiltration method with high infiltration efficiency even on a ground (including road) paved with concrete, asphalt, or the like. It is an object of the present invention to provide a drainage permeation structure that is free from the risk of landslide caused by the formation of water channels in soil.

[0010]

The present invention is provided so as to be surrounded by a groove formed in the ground having a paved surface, a crushed stone layer filled in the groove, and a crushed stone layer in the groove. In a trench drainage permeation structure, which has a horizontal water conduit pipe, and in which the water conduit pipe has permeation holes for permeating wastewater toward the crushed stone layer, it is provided above the water conduit pipe. With a ventilation pipe formed with a ventilation hole, a sand layer provided on the upper surface of the crushed stone layer through a net, and a catchment block with an opening formed on the bottom surface placed on the sand layer. In addition, the drainage inlet of the water guiding pipe is opened above the sand layer in the water collecting channel block.

[0011]

According to the present invention described above, drainage such as rainwater flows into the block for the water collecting channel and flows into the sand layer. When the sand layer is clogged with sediment mixed with the drainage, the drainage flows from the drainage inlet of the water guiding pipe opening above the sand layer into the water guiding pipe, and from the permeation hole of the water guiding pipe into the crushed stone layer. Is discharged. At this time, air is supplied from the ventilation holes of the ventilation pipe toward the water guiding pipe in the trench or is exhausted, so that even if the ground surface is paved, the inside of the trench is in an air lock state. The wastewater discharged into the crushed stone layer can be infiltrated into the soil.

Further, when a maintenance pit for discharging sediment is provided immediately below the drainage inlet of the water guiding pipe, the sediment mixed with the wastewater flowing from the drainage inlet is collected in the maintenance pit. As a result, sediment and the like will not flow out from the permeation holes and the inside of the crushed stone layer will not be clogged with the sand and sand.

[0013]

1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a front sectional view. As shown in these figures, first, a groove having a predetermined depth is excavated along the excavation line L, and the water guiding pipe 1 is laid horizontally in the vicinity of the bottom of the groove along the groove. deep. Needless to say, although the laying direction of the water conduit pipe is horizontal, it has a certain degree of inclination to allow drainage to flow.

In the water guiding pipe 1, permeation holes 11 are formed at regular intervals or at random so as to communicate the inside and outside of the water guiding pipe 1.

A ventilation pipe 2 is provided above the water guiding pipe 1 so as to be parallel to the water guiding pipe 1. The ventilation pipe 2 is formed with a ventilation hole 21 on the lower side of its peripheral surface so as to communicate the inside and outside of the pipe. Since this ventilation pipe 2 only sends air into the trench or discharges it into the trench, its diameter may be set smaller than that of the water pipe 1.

A penetrating hole 11 is formed in the water guiding pipe 1 so as to communicate the inside and outside of the pipe. The permeation holes 11 are formed so as to have a constant interval on the upper side in the circumferential direction. However, the permeation holes 11 may be arranged at random instead of at regular intervals.

In this embodiment, as shown in the figure, only one water pipe 1 is laid, but a plurality of water pipes 1 may be laid in parallel. Further, when a plurality of water guiding pipes 1 are laid, the ventilation pipes 2 may be provided in the number corresponding to each water guiding pipe 2.
The number may be less than the number of water pipes 1.

After laying the water guiding pipe 1 and the ventilation pipe 2 in the groove, crushed stones are filled in the groove to form a crushed stone layer 3.

On the upper side of the crushed stone layer 3, a net 5 made of, for example, a vinyl insect repellent net is laid, and sand is laid on it to form a sand layer 7. A water catchment block 8 made of concrete is placed on the sand layer 7. The structure of the water collection block 8 will be described later. The sand layer 7 facilitates the laying of the water collection channel block 8, and is specifically for aligning the top ends of the water collection channel block 8.

A vertical portion 13 is provided upward from a predetermined position on the horizontal portion of the water guiding pipe 1, and an upper end of the vertical portion 13 is opened above the sand layer 7. This opening serves as a drainage inlet 15 for taking the drainage into the water guide pipe 1.

The water guiding pipe 1 is provided with a maintenance pit 17 on the side opposite to the vertical portion 13 extending to the drainage inlet 15 side, that is, below the water guiding pipe 1.
The maintenance pit 17 is provided immediately below the drainage inlet 15, and is a place to store the soil and the like when the drainage from the drainage inlet 15 contains the soil and the like.
That is, the sediment is prevented from flowing out of the permeation hole 11 of the water guiding pipe 1 into the crushed stone layer 3, so that the crushed stone layer 3 is not clogged with the sediment, etc. This is because the state is not allowed.

The opening position of the ventilation port 23 of the ventilation pipe 2 is
Although not particularly limited, in the present embodiment,
As shown in the figure, it opens into the water collection channel block 8.
This opening height position must be set higher than the position of the water flowing in the water collection channel block 8 so that rainwater or the like does not flow into the ventilation pipe 2.

The water collection channel block 8 has a unit shape, and a plurality of blocks are connected to form a water collection channel. The water catchment block 8 has side plate portions 81 on both side surfaces and a pedestal portion 83 that extends between the side plates at a predetermined interval.
Communication openings 85 are formed in the gantry parts 83 so that drainage flows between the gantry parts 83.

A lid 9 is provided on the upper part of the water collection channel block 8 so as to be supported by the side plate portion 81 and the pedestal portion 83. A through hole 91 is formed in the lid body 9 so that rainwater or the like from the paved surface H can flow into the water collection block 8. The upper surface position of the lid body 9 needs to be at the same height as the pavement surface H or below. In the illustrated example, the upper surface of the lid 9 is warped so that rainwater or the like can easily enter toward the through hole 91.

By the way, the direction of the water pipe 1 and the ventilation pipe 2 in the groove is as follows.
In Fig. 1, the portion where the permeation hole 11 is not formed is located on the lower side, and the portion where the permeation hole 11 is formed is located on the upper side.

The ventilation pipe 2 is laid so that the portion where the ventilation hole 21 is not formed is the upper side and the portion where the ventilation hole 21 is formed is the lower side.

When the portion of the water guiding pipe 1 where the permeation hole 11 is formed is not placed on the lower side, when a small amount of water flows through the water guiding pipe 1, it prevents the water from flowing out only from the bottom and prevents the formation of a water channel. This is because. The reason why the vent hole 21 forming side of the ventilation pipe 2 is directed downward is that the water guiding pipe 1 is located below the ventilation pipe 2, and the air pressure is efficiently transferred from the permeation hole 11 of the water guiding pipe 1 to the crushed stone layer. This is because it acts on the water that has flowed out during the period.

Naturally, the present invention is not limited to the above embodiments, and various design changes and the like made within the scope of the present invention are also included in the scope of the present invention. . For example, although one water guiding pipe 1 is provided, two or more water guiding pipes may be provided, and a plurality of water guiding pipes may be arranged in a mesh shape instead of in parallel. In this case, it is necessary to arrange the ventilation pipes correspondingly. Further, although the shape of the water guiding pipe and / or the ventilation pipe is a cylindrical shape, the shape is not limited to this and may be a rectangular tube shape. Further, the ventilation pipe may be formed into a flat tubular shape and the ventilation hole may be formed on the lower side surface.

Further, in the above description, the water pipe 1
The drainage flowing inside was rainwater, but this drainage may be drainage from a septic tank. In this way, when the waste water from the septic tank flows, the sand layer 5 fulfills the filtering function. When the sand layer 3 is clogged with the organic suspended matter, the sand may be exchanged before a bad odor may be generated. This sand can be easily formed by removing the lid 9. In the case of septic tank wastewater treatment, it is desirable to keep the trench depth shallow within 1 meter in anticipation of the function of decomposing organic matter in soil.

[0030]

As described above, according to the present invention, air is introduced into the crushed stone layer through the ventilation hole of the ventilation pipe, and the pressure of this air acts on the water flowing out from the permeation hole of the water guiding pipe. Even in a situation where the ground surface is paved with concrete or asphalt, or is crushed, rainwater can be effectively penetrated into the ground by using the trench infiltration method.

Moreover, according to the present invention, since the advantages of the trench infiltration method are effectively utilized, a water channel is not formed when rainwater or the like is infiltrated into the ground, which allows the ground to be used at a place such as a hill. Even if rainwater penetrates inside,
It is possible to effectively prevent the occurrence of accidents such as landslides.

Further, in the present invention, since the structure is relatively simple, such as the collection and drainage canal is made into a unit type of block, it can be easily installed on the side of the road without rainwater removal structure often found on prefectural roads and municipal roads. It can be installed inexpensively.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of an embodiment of the present invention.

[Explanation of symbols]

 1 water conduit, 11 permeation hole, 13 vertical part, 15 drainage inlet, 17 maintenance pit, 2 ventilation pipe, 21 ventilation hole, 23 ventilation hole, 3 crushed stone layer, 5 net, 7 sand layer, 8 collection drainage block, 81 side plate Part, 83 mount part, 85 communication opening part, 9 lid body, 91 through hole.

Claims (1)

[Claims] 1. A groove formed in the ground having a paved surface, a crushed stone layer filled in the groove, and a horizontal water-conducting pipe provided so as to be surrounded by the crushed stone layer in the groove. In the trench drainage permeation structure where the water conveyance pipe has a permeation hole for permeating the wastewater toward the crushed stone layer, the ventilation hole provided above the water conveyance pipe is formed. The water guide pipe comprises a pipe, a sand layer provided on the upper surface of the crushed stone layer via a net, and a water collection block having an opening formed on the bottom surface placed on the sand layer. The drainage inflow structure is characterized in that the drainage inlet is opened above the sand layer in the water collecting block.