JP2011080332A - Drainage structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To drain a large amount of rain water even when there is a ground where an asphalt is constructed on a ground and surface of the earth having a low permeable layer. <P>SOLUTION: A drainage structure 10 on the ground 4 having a high permeable layer 3 under the soil includes: catchment implement 20 which comprise a rain water trench 22 for collecting the rain water falling on the surface of the earth and catch basin 21; and drainage channels 30 which comprise a through-hole that reaches the permeable layer 3, and into which the rain water collected by the catchment implements 20 flows. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drainage structure in a ground having a water permeable layer.

  Conventionally, a drainage structure for draining rainwater has been provided in order to prevent flooding during rainfall. As such a drainage structure, one that collects rainwater in a catchment through a drainage trough and infiltrates water from the catchment to the ground or drains from the catchment through a rainwater drain pipe is used. (For example, refer to Patent Document 1).

JP 2007-177614 A

  However, in the drainage structure as described above, water cannot be rapidly penetrated into the ground, and in the case of rainfall more than expected, such as torrential rain, the amount of rainfall exceeds the amount that can be drained, and the concentration is high. Water overflows from the water tank. In particular, on ground with asphalt laid on the ground surface and ground with a low water permeability layer such as a loam layer, the amount of infiltration of rainwater is further limited, and rainwater cannot be drained.

  The present invention has been made in view of the above problems, and its purpose is to allow a large amount of rainwater to be drained even on ground with a low water permeability layer or ground with asphalt on the ground surface. It is.

  The drainage structure of the present invention is a drainage structure in the ground having a water-permeable layer with high water permeability in the underground, and a water collecting portion for collecting rainwater that has fallen on the surface of the ground, and an upper end communicated with the water collecting portion. And a drainage path comprising a hole whose lower end reaches the water permeable layer.

In the above drainage structure, the drainage path may be filled with crushed stone.
The ground may include a low water permeable layer having a lower water permeability than the water permeable layer above the water permeable layer, or asphalt may be laid on the ground surface.
Moreover, you may further provide the water collection groove | channel which collects rainwater to the said water collection part.

  According to the present invention, a through hole is formed so as to reach the water permeable layer, and rainwater is drained to the water permeable layer through the through hole, so that a large amount of rain water can be drained even during a heavy rain.

The drainage structure of this embodiment is shown, (A) is a top view, (B) is II sectional drawing in (A). The flow of rainwater at the time of rain in the drainage structure is shown, A) is a plan view, and (B) is a cross-sectional view taken along line II in (A).

Hereinafter, an embodiment of the drainage structure of the present invention will be described in detail with reference to the drawings.
1A and 1B show a drainage structure 10 of the present embodiment, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line II in FIG. The drainage structure 10 of the present embodiment drains rainwater in the ground 4 provided with a low-permeable layer 2 such as a loam layer and a permeable layer 3 such as a gravel layer located below the low-permeable layer 2. belongs to. As shown in the figure, the drainage structure 10 of this embodiment includes a rainwater trench 22 provided so as to surround the periphery of the building 1 and a drainage basin 21 provided at an appropriate interval in the rainwater trench 22. And a drainage path 30 formed so as to reach the permeable layer 3 from the catchment basin 21.

  The rainwater trench 22 is a groove having a substantially rectangular cross-section, and is filled with crushed stone 23 inside. In addition, the bottom surface of the rainwater trench 22 is provided with a slope that becomes a downward slope toward the catchment 21.

  The drainage basin 21 is made of a concrete member in which a substantially rectangular parallelepiped space is formed inside the top surface of which is opened, and the upper end of the drainage passage 30 is opened on the bottom surface. Further, the upper portion of the water collecting bowl 21 is closed by a lid member 21A.

  The drainage path 30 is constructed by, for example, forming a through hole that reaches the water permeable layer 3 on the ground 4 with an auger or the like, and filling the through hole with a crushed stone 31. In addition, when the low water permeable layer 2 is a loam layer, since it can be self-supported even when the ground 4 is excavated, a through hole can be easily formed.

  In addition, a pipe 40 is provided so as to connect the drain port 1 </ b> A that discharges rainwater collected on the roof of the building 1 and the catchment 21. The pipe 40 may be provided on the ground, but is preferably provided underground.

  2 shows the flow of rainwater in the drainage structure 10 during rainfall, A) is a plan view, and (B) is a cross-sectional view taken along line II in (A). As shown in the figure, rainwater that falls on the surface of the site of the building 1 flows into the rainwater trench 22. As described above, the rainwater trench 22 is provided with a slope that is inclined downward toward the catchment basin 21, so that the rainwater that has flowed into the rainwater trench 22 flows into the catchment basin 21. In addition, rainwater that has fallen on the roof of the building 1 flows from the drain 1 </ b> A through the pipe 40 to the catchment 30.

  And the rainwater which flowed into the water catchment 21 in this way flows in the drainage path 30, and flows into the water permeable layer 3. At this time, the crushed stone 31 in the drainage channel 30 functions as a filter, and removes suspended matters and the like.

  According to this embodiment, since rainwater is poured into the permeable layer 3 through the drainage path 30, even if it is the ground provided with the low permeable layer 2, even if it is a lot of rainwater, it can drain | drain reliably.

  Moreover, since the drainage path 30 can be constructed only by forming a through hole such that the lower end reaches the water permeable layer 3 by an auger or the like and filling the through hole with crushed stone, the construction cost can be suppressed. .

  Moreover, since rainwater is drained to the permeable layer 3, groundwater can be recharged and it can contribute to environmental conservation.

  In the present embodiment, the crushed stone 31 is filled in the drainage passage 30. However, the present invention is not limited to this, and the crushed stone 31 may be omitted when the ground can stand on its own.

  Moreover, in this embodiment, although the crushed stone 23 was filled in the rainwater trench 22, it is not restricted to this, The rainwater trench 22 is not filled with the crushed stone 23, but the upper part of the rainwater trench 22 is closed with a lid | cover. It is good.

  Moreover, although this embodiment demonstrated the case where the drainage structure of this invention was applied to the ground provided with the low water-permeable layer 3 with low water permeability, such as a loam layer, not only this but water permeability, such as asphalt, is low. The present invention can also be applied to the ground where the material is laid. In such a case, a drainage path that penetrates the asphalt and reaches the water permeable layer may be provided.

  Moreover, although this embodiment demonstrated the case where the drainage structure was provided around the building, not only this but the drainage structure of this invention can also be provided in the whole cities etc. That is, a rainwater trench and a catchment basin are provided on a street or the like, and a drainage path reaching from this catchment basin to a seepage layer is provided. Thereby, it can contribute to environmental conservation in the whole city.

DESCRIPTION OF SYMBOLS 1 Building 2 Low-permeability layer 3 Permeable layer 4 Ground 10 Drainage structure 20 Catchment means 21 Catchment 22 Rainwater trench 23 Crushed stone 30 Drainage path 31 Crushed stone 40 Piping

Claims (4)

It is a drainage structure in the ground with a water-permeable layer with high water permeability underground,
A water collecting section where rainwater that falls on the surface of the earth is collected;
A drainage path comprising a hole whose upper end communicates with the water collection section and whose lower end reaches the water permeable layer;
A drainage structure characterized by comprising:   The drainage structure according to claim 1, wherein the drainage path is filled with crushed stone.   The drainage structure according to claim 1 or 2, wherein the ground includes a low water permeable layer having a lower water permeability than the water permeable layer above the water permeable layer, or an asphalt is laid on the ground surface. . The drainage structure according to any one of claims 1 to 3,
A drainage structure further comprising a water collecting groove for collecting rainwater to the water collecting portion.

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