JPS6233805Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a rainwater underground infiltration pipe.

In urban areas, the rate of paved roads is extremely high, and sewerage systems are widely used, which increases the amount of rainwater flowing into rivers from sewers. Now, when it rains, they are easily committed and cause urban floods.

For this reason, recently, rainwater drainage systems have come into use in which rainwater is first stored in special rainwater basins, foreign substances are removed, and then the rainwater permeates into the ground. Figure 1 shows the outline of the main parts of this rainwater drainage system. In the figure, 10 is a special rainwater basin, which is buried under the ground, and whose upper opening, which is equipped with a filter 12, is connected to a roadside ditch. 20. Reference numeral 30 denotes a vertical underground rainwater infiltration pipe extending deep into the ground, provided as necessary, and 40 an underground rainwater infiltration pipe extending laterally, both of which have an inlet filter (not shown) attached to the rainwater inlet. 50 is a permeable layer consisting of sand and crushed stones.

The rainwater that flows into these underground rainwater infiltration pipes 30 and 40 is filtered by the inlet filter and then flows in. However, since it is difficult to sufficiently remove minute dust and earth and sand (hereinafter referred to as earth and sand), the rainwater underground infiltration pipes 3
0 is further provided with an unillustrated intermediate filter that can be inserted and removed from the ground. However, since it is difficult to install an intermediate filter in the other underground rainwater infiltration pipe 40 in a removable manner, if you try to increase the infiltration speed by increasing the diameter of the infiltration hole, the sediment in the rainwater will just infiltrate. If the pore diameter is made smaller to prevent this from flowing into the layer and clogging the infiltration layer, the amount of rainwater discharged will not be able to catch up with the amount of rainwater flowing in during torrential rains, and rainwater will overflow onto the roads. In addition, during burying, crushed stones backfilled into the trenches entered the pipes through the seepage holes, reducing the fluidity of rainwater.

The present invention was developed in view of the above-mentioned problems. By using an egg-shaped synthetic resin pipe and having infiltration holes only on the side of the pipe, it functions satisfactorily even during torrential rains. It is difficult for recycled crushed stone to enter the pipe, and it is possible to suppress the outflow of sediment from the permeation holes, allowing clean rainwater to infiltrate into the permeation layer.It has a high self-removal function for sediment deposited in the pipe, and maintenance is reduced compared to conventional methods. The purpose of the present invention is to provide a rainwater underground infiltration pipe that is extremely easy to use compared to other systems.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 60 denotes _a rainwater underground infiltration pipe, and as shown in cross section in _{FIG . 2} > R ₁ > R ₃ ), and the pipe top 60A
It is made using a synthetic resin egg-shaped tube whose maximum width is larger than that of other parts, and the tube side part 60B,
60B has a large diameter penetration hole 61 in the upper part, a small diameter penetration hole 63 in the lower part, and both penetration holes 6.
Medium-diameter penetration hole 62 in the middle part in the height direction of 1 and 63
are formed in large numbers at certain intervals in the longitudinal direction. Note that the total pore area of the permeation holes 61 is larger than the total pore area of the permeation holes 62;
The total pore area of the permeation holes 63 is larger than the total pore area of the permeation holes 63.

FIG. 4 shows how this underground rainwater infiltration pipe 60 is used. In this example, a round pipe conversion collar 7 is used to connect the rainwater underground infiltration pipe 60 and the special rainwater basins 10, 10.
0 and 70 are used, but they may also be directly connected.

This rainwater underground infiltration pipe 60 has a special rainwater tank 10,
When rainwater flows in from 10, when the water level in the pipe exceeds the height of the permeation hole 63, it flows from the permeation hole 63, and when it exceeds the height of the permeation hole 62, it flows from the permeation holes 62 and 63.
When the water level rises further and exceeds the height of the permeation hole 61, rainwater flows out from all the permeation holes 61, 62, and 63 and permeates into the permeation layer 50. Moreover, the higher the position of the permeation hole, the more permeation of the same pore size. As the total area of the holes in the hole group increases, the amount of rainwater discharged increases significantly as the water level within the jurisdiction increases, so even if the amount of inflowing rainwater per unit time increases rapidly due to localized heavy rain,
Immediately drain this water and use special rainwater.10,10
Prevent rainwater from escaping.

In addition, in this rainwater underground infiltration pipe 60, when buried,
Even if crushed stones that are backfilled from above the pipe fall,
Since the pipe top part 60A acts as an umbrella for the part below, fallen crushed stones can be absorbed into the penetration hole 6.
There is no risk of falling into the pipe from 1, 62, and 63.

Furthermore, this rainwater underground infiltration pipe 60 has a pipe upper part 60.
Since the tube width of the lower portion from A becomes narrower toward the tube bottom, a sufficient penetration hole area can be formed in the tube side portions 60B, 60B even if the depth of the tube bottom portion 60C is increased. Since the diameter of the permeation hole is smaller towards the bottom of the pipe, it is difficult for the sediment in the rainwater pumped toward the bottom of the pipe to flow out from the permeation hole.
To efficiently discharge clean rainwater to a permeable layer 50.
In addition, because of the high sweepability of the pipe bottom 60C, the above-mentioned sediment that has been pumped down is naturally swept away to one of the special rainwater basins 10 and 10, so the proportion of sedimentation on the pipe bottom is small, and the required cleaning cycle is long. Become.

Furthermore, as described above, the position of the penetration hole is at the tube bottom 60.
The pore diameter becomes smaller as it goes down to the C side, and since there is no seepage hole in the bottom part 60C of the pipe, even when cleaning by forcing water into the pipe, accumulated sediment will not flow into the seepage layer 50. There is no risk of leakage.

Note that the number of stages of permeation holes is changed depending on the pipe diameter, the type of permeation layer, etc., and permeation holes of the same diameter may be formed in multiple stages.

As described above, according to the present invention, by using an oval tube and forming infiltration holes on the side of the tube, the infiltration speed is automatically adjusted according to the amount of inflowing rainwater, so it is sufficient even during torrential rain. This function allows clean rainwater to infiltrate into the permeation layer, prevents backfilling crushed stones from entering the pipe, has a high natural removal function for sediment, and prevents accumulated sediment from flowing out from the permeation hole during cleaning. This has the advantage that maintenance, including the permeation layer, is very easy and costs are low.

[Brief explanation of the drawing]

Fig. 1 is a sectional view schematically showing the main parts of a rainwater drainage system, Fig. 2 is a perspective view of an embodiment of the rainwater underground infiltration pipe according to the present invention, Fig. 3 is a sectional view of the above embodiment, and Fig. 4 is the above-mentioned embodiment. It is a usage state diagram of an Example. 60A...Tube top, 60B...Tube side, 60C
...Tube bottom, 61, 62, 63... Penetration holes.

Claims (1)

[Claims for Utility Model Registration] 1. It is an oval tube in which the maximum width of the top part is larger than that of other parts, and a large number of permeation holes are formed in the side part of the pipe except for the top part and the bottom part. Features underground rainwater infiltration pipes. 2 The diameter of the permeation pores gradually increases downward in the circumferential direction.
The rainwater underground infiltration pipe according to claim 1 of the utility model registration claim, which is made smaller. 3. Claims 1 or 2 for registration of a utility model in which the total area of the pores at the same height position of the permeation holes is gradually decreased in the downward circumferential direction.
Rainwater underground infiltration pipes as described in section.