JP2001295355A - Penetrating facility for road and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a penetrating facility for road capable of securing a penetrating function having excellent workability regardless of longitudinal gradient and its construction method. SOLUTION: Underground at the side end of a road surface having a longitudinal gradient, a penetrating side gutter 13 is continuously arranged along the longitudinal gradient, a penetrating basin 15 is interposed at its middle portion in this penetrating facility, a weir 16 is provided at the boundary portion between at the penetrating side gutter 13 located at the upstream side in the flowing direction and the penetrating basin 15 located at the downstream side, and further a filled layer 14 such as crushed stones around the penetrating side gutter 13 is separated from a filling layer 22 around the penetrating basin 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road infiltration facility which is excellent in workability and can ensure a permeation function irrespective of a vertical gradient, and a construction method thereof.

[0002]

2. Description of the Related Art Generally, paved lands such as roads need drainage, and are provided with gutters, street drains, catchment basins, and other appropriate drainage facilities. In the case of road drainage, for example, the road surface is generally provided with a cross slope or a vertical slope, whereby water is collected in a road-side gutter. Rainwater, snowmelt water, etc. collected in the gutter are collected in the drainage basin by natural flow, and guided to the manhole via the drainage pipe and the drainage pipe. From the manhole, it will be treated by flowing down the sewer main to the drainage facility. On the other hand, the rapid expansion of urban areas covered by buildings and asphalt has resulted in a decrease in the surface area that has served as a water retention / reservation function. The volume peaks have also increased, increasing the risk of urban floods. In addition, a decrease in the amount of rainwater that penetrates into the underground lowers the shallow groundwater level in cities, causing a decrease in normal river flow and a decrease in evapotranspiration. . In such a background, there is a demand for promotion of permeable pavement of a sidewalk and improvement of a permeable ability of a roadway. In addition, this is expected to contribute to groundwater recharge and natural environment restoration.

[0003] Conventionally, as a permeation facility for rainwater or the like, various products such as a permeation tank, a permeation trench and a permeation side groove have been proposed, and concrete products, plastic products, or products made of permeable concrete provided with holes and slits have been proposed. Is already used. Then, while burying the above product in the ground, the surrounding area is, for example, No. 4 crushed stone (30 to 20 m).
m) and the like, and the collected rainwater and the like penetrates from the bottom and side surfaces to form a permeation facility.

[0004] Most of the infiltration gutters have an opening at the side or bottom of the U-shaped gutter, filling the bottom and side surfaces of the gutter with crushed stone, and allowing rainwater to permeate underground through an external crushed stone layer. . These are basically used for rainwater treatment of parking lots, sidewalks, and pavements on the premises.They store rainwater in gutters and crushed stone layers and gradually infiltrate it underground. Or it is constructed with a gentle slope. However, when the infiltration-side ditch is installed on a normal sidewalk or road, it is difficult to secure the infiltration function when the incline is steep because the incline ditch is installed in accordance with the slope of the ground surface. That is, rainwater is collected in the drainage basin from the gutter in a short time by natural flow, and the storage process required for underground infiltration is eliminated. In addition, the flow of water generated during the crushed stone caused the earth and sand to be drawn in around the ground, and there was a concern that the ground surface would collapse. Furthermore, when the opening at the bottom was large, there were cases in which crushed stone was rolled up (spouted) by running water.

[0005] For the reasons described above, rainwater infiltration where there is a vertical gradient often uses an infiltration trench rather than an infiltration trench. The infiltration facility using this infiltration trench
As shown in FIG. 1, a substantially horizontal infiltration trench 92 having a predetermined length is combined with an infiltration basin 91, and such an infiltration facility is filled with a packed layer 93 of crushed stone or the like of each infiltration facility. In order to avoid discontinuity, a method of discontinuously installing the apparatus at a distance of 1 m or more was adopted.

[0006]

However, in the infiltration facility using the infiltration trench, since each infiltration facility is divided and installed, it cannot be continuously excavated at the time of construction. there were. Also,
Such infiltration facilities have a large amount of excavated soil because they are installed deeper than the ground surface, and have the drawback of subsidence due to insufficient compaction of backfill.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above, and has a seepage gutter continuously disposed along a longitudinal slope in the ground at a side end of a road surface having a longitudinal slope. In addition, a road seepage facility in which a seepage measure is interposed and arranged on the way, and a weir is provided at the boundary between the seepage side groove located on the water side in the flow direction and the seepage measure located under the water. Provided,
Further, the present invention relates to a road infiltration facility, characterized in that a packed layer of crushed stone and the like around the seepage side gutter is separated from a packed layer around the seepage pit.

The present invention also proposes a method for constructing the above-mentioned road infiltration facility, and continuously excavates a side edge of a road surface provided with a vertical gradient to arrange the infiltration gutter. And filling the surrounding area (side and below) with crushed stone, etc., excavating deeper in the middle, interposing and arranging an infiltration vessel, and surrounding the lower part of the filling layer of the infiltration side groove (front and rear) A method for constructing a road infiltration facility comprising a step of filling crushed stones etc. on the left and right and below), wherein a permeation basin provided with a weir at the upper end of the water in contact with the infiltration-side ditch, or a submerged side in contact with the infiltration basin By arranging a permeation-side groove provided with a weir at the end of the, a weir is provided at the boundary between the permeation groove located on the water side in the flow direction and the permeation basin located below the water, and the permeation groove is further provided. To provide a water stop section that covers the underwater end of the surrounding packed bed Ri, characterized by dividing the filling layer around the penetration groove and the filling layer around the percolating box.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to embodiments of the drawings. In the road infiltration facility shown in FIG. 2, the road is shown horizontally, but the left side is the water side of the vertical gradient, the right side is the water side, and the steel grating (11) is fitted on the surface. Below the culvert (apron) 12, a permeation-side groove 13 made of permeable concrete and having a substantially U-shaped cross section is continuously provided along a vertical gradient. Around such a permeation side groove 13 (side and below), a packed layer 14 such as crushed stone is provided.
Is provided. Therefore, the filling layer 14 is a substantially U-shaped layer outside the permeation-side groove 13. Further, the bottom surface of the permeation-side groove 13 may be in an open state, a material such as a bottom block 20 described later may be combined, or a filter material such as a nonwoven fabric or a mesh material is laid to collect soil and the like. You may do it.

As shown in FIG. 3, the infiltration vessel 15 interposed and arranged in the middle of the infiltration-side groove 13 has a front surface (water-side end surface).
An upper block 18 provided with a weir 16 and a grating 17 extending over the left and right walls, a cylindrical lower block 19 having an open bottom surface, and a rectangular bottom block 20. Also made of permeable concrete. The weir 16 provided in the upper lump 18 blocks the internal space of the permeation-side groove 13 disposed above the water. On the side of the upper half portion of such an infiltration basin 15,
1, a filling layer 22 filled with recycled aggregate is provided on the front, rear, left, right, and lower sides of the lower half. The filling concrete 21 is disposed not only on the side of the upper half of the infiltration tub 15 but also on the underwater end face of the filling layer 14 around the infiltration-side groove 13 disposed on the waterside, and on the underwater side. The filling layer 14 is filled so as to cover the water-side end surface of the filling layer 14 around the permeation-side groove 13, so that the filling layer 14 of the permeation-side groove 13 and the permeation box 15 are filled.
This is a water stop section that separates the filling layer 22 from.

In FIG. 3, reference numeral 23 denotes bed sand and reference numeral 24 denotes a water-permeable sheet (nonwoven fabric). In addition, in the illustrated embodiment, the weir 16 is provided on the upper lump 18 constituting the infiltration tub 15, but such a weir 16 may be provided at the end of the permeation-side groove 13. That is, the weir 16 may be provided at any of the boundary portions between the permeation-side groove 13 located on the water side in the flow direction and the permeation box 15 located on the water side.

[0012] The construction of such a road infiltration facility is generally carried out in the following procedure.・ First, the side edge of the road surface with a vertical gradient is continuously excavated, and the excavation is further excavated partway through the infiltration basin 15. -The infiltration-side groove 13 is disposed so as to be continuous, and the surroundings (side and below) are filled with crushed stones (14). The lower mass 19 and the bottom block 20 are disposed so as to be interposed in the middle of the continuous permeation-side groove 13, and crushed stones and the like (around the front, rear, left and right, and below) around the position lower than the filling layer 14 of the permeation-side groove 13. 22) is filled. Sand 23 is laid on the lowermost surface, and a water-permeable sheet 24 is laid around the filling layer 22.・ The upper lump 18 is arranged (placed) on the upper part of the lower lump 19.
At the same time, the periphery (side) of the filling layer 14 around the end face of the filling layer 14 (the periphery of the permeation side groove 13 disposed on the water surface)
Of the filling layer 14 surrounding the permeation-side groove 13 disposed under the water, and the upper end surface of the filling layer 22 surrounding the lower mass 19. 2
Fill 1 (water stop).

In the road infiltration facility of the present invention constructed as described above, rainwater, snowmelt water, and the like collected on the side of the road due to the cross slope of the road surface or the like are partially used as a street apron 12.
It flows down along a vertical gradient, most of which is guided into the permeate channel 13 below it. The water guided into the infiltration-side groove 13 penetrates into the underground through the infiltration-side groove 13 and the surrounding packed layer 14, and a part of the water flows down the infiltration-side groove 13 along the vertical gradient to the lower side. It is blocked at 16 and does not flow into the seepage box 15 at a stretch. Similarly, the water permeated from the inside of the permeation side groove 13 into the surrounding filling layer 14 also flows down along the vertical gradient to the downwater side, but may flow into the filling layer 22 around the permeation tank 15 by the water stopping portion 21. Absent. The water whose flow is blocked by the weir 16 and the water stopping portion 21 is stored in the permeation-side groove 13 and the filling layer 14 for a proper period, and gradually permeates underground. Water that flows over the weir 16 flows into the infiltration basin 15 and is appropriately stored in the lower lump 19 and the packed bed 22 for a period of time. It is guided to a manhole via a not-shown attachment pipe or drainage pipe, and from this manhole, it is processed by flowing down to a drainage facility by a sewage main pipe. The number and interval of the seepage pits 15 provided and disposed in the middle of the seepage-side groove 13 can be obtained from the vertical gradient of the road, the water collection area, the rainfall intensity, the cross-sectional area of the seepage-side groove 13, and the like.

Therefore, the road infiltration facility of the present invention
It can delay river runoff time during heavy rains, reduce the amount of flood runoff, and reduce the risk of urban floods. In addition, since the amount of rainwater that penetrates underground is increased, it is possible to maintain the normal flow rate and evapotranspiration of rivers without lowering the shallow groundwater level of cities, and to maintain the water cycle in nature. It will contribute to. Furthermore, it is expected that such an action will contribute to groundwater recharge and natural environment restoration. In addition, since the flow of water generated in the filling layer 14 can be suppressed, it is possible to prevent pulling in of the surrounding earth and sand and also to prevent the ground surface from sinking. Further, even if a large opening is provided at the bottom of the infiltration-side groove 13, the flow velocity does not increase as the crushed stone moves, so that an event such as the crushed stone being rolled up (spout) can be prevented.

Hereinafter, an example of the construction of the road infiltration facility of the present invention will be described, but the present invention is not particularly limited to this. -Method of determining the maximum interval (L) of the penetration pit The extension at which the height of the bottom plate at the upstream start point of the penetration groove and the height of the top of the weir are the maximum interval (L). Permeation side groove (U-300
× 300) and the vertical slope i = 10 °, the maximum weir height (H) is 80% of the height of the penetration side groove = (300 mm × 0.8 =) 0.24
m, the maximum interval L = 24 m.・ When there is no weir, catchment width 7m, rainfall intensity I = 90mm / h, gutter cross section (U-3
00 × 300), the rainfall (Q) flowing into the gutter in the case of the vertical gradient i = 10 ° is the runoff coefficient C = 0.9 and the catchment area A = 24
Assuming that m × 7 m = 214 m ² , Q = 0.00378 m ³ / s. Gutter roughness coefficient n = 0.015, water depth hm, channel width 0.3
If it is 0m, according to Manning's formula, Q / (0.3h) = (1 / n) · (0.3h / (0.3 + 2h)) ^2/3 ·
i ^1/2 h ≒ 0.025 m. Since the flow velocity v is 0.504 m / s, the calculation result is that the flow in the side groove (24 m) flows down in about 47 seconds. Therefore, the amount of rainwater storage (V) in the 24m of the gutter is
It becomes 0.178m ³ / 24m. -In the case of the present invention having a weir In contrast, the rainwater storage amount (V) in the 24 m of the seepage-side ditch is 0.86 m less than the height of the weir (0.24 m) and the width of the seepage-side ditch (0.30 m).
It is 4m ³ / 24m. When this weir is provided, a height margin of 0.06 m is expected in the permeation side ditch,
If weir is not compared to ^{(0.178m 3 / 24m) 0.864m 3} /
It is expected that the amount of storage / penetration of 24m or more will increase. As compared with the case where there is no weir, there is an effect that approximately 5 times the amount is surely permeated.

In the above example, the storage amount only in the infiltration-side groove is described for simplifying the conditions. However, since the packed bed in which the crushed stone or the like is filled around the infiltration-side groove also has a water retention and storage function. In addition, a larger storage / penetration amount can be obtained.

Although the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the above-described embodiments, but may be modified in any way unless the structure described in the claims is changed. Can be implemented. For example, in the illustrated embodiment, the infiltration groove and the infiltration basin are permeable concrete products, but may be concrete products or plastic products provided with holes or slits. Also, the material of the weir is not particularly limited.

[0018]

As described above, the road infiltration facility of the present invention has a weir at the boundary between the infiltration groove located on the upper side in the flow direction and the infiltration basin located on the lower side of the water. , Rainwater, etc., guided into the infiltration-side ditch is blocked by the weir and does not flow into the infiltration basin at a stretch, and rainwater that has permeated into the filling tank around the permeation-side ditch is also blocked by the water stop Can be The rainwater or the like whose flow has been blocked by the weir and the water stopping part is stored in the permeation-side ditch and the packed bed for an appropriate period, and gradually permeates into the underground. Therefore, the road infiltration facility of the present invention can delay the time of collecting water into manholes and rivers during heavy rain, prevent floods and urban floods, and contribute to the conservation of the water cycle in nature. In the method for constructing a road infiltration facility of the present invention, the infiltration basin is arranged in the middle of the infiltration gutter continuously arranged along the vertical gradient, so that the excavation work is performed particularly continuously prior to the construction. Therefore, the construction is extremely simple as compared with the conventional method using the penetration trench.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a permeation facility using a conventional permeation trench.

FIG. 2 is a longitudinal sectional view showing one embodiment of a road seepage facility of the present invention.

FIG. 3 is a cross-sectional view of an infiltration basin portion of the road infiltration facility of FIG. 2;

[Explanation of symbols]

 13 Infiltration-side groove 14 Filling layer 15 Seepage measure 16 Weir 18 Upper lump 19 Lower lump 21 Filling concrete (water blocking part) 22 Filling layer

Claims (2)

[Claims] 1. A road formed by continuously arranging a seepage-side ditch along the longitudinal slope in the ground at the side end of a road surface provided with a longitudinal slope, and interposing and arranging a seepage pit in the middle thereof. A weir is provided at the boundary between the infiltration gutter located above the water in the flow direction and the infiltration basin located below the water, and a packed layer of crushed stones and the like surrounding the permeation gutter is used for the infiltration basin. A road infiltration facility characterized by being separated from the surrounding packed bed. 2. A step of continuously excavating a side edge of a road surface to which a vertical gradient is applied, arranging the infiltration gutter so as to be continuous, and filling the periphery thereof with crushed stone, etc. Interposing and arranging the infiltration basin and filling the crushed stone or the like around a position lower than the filling layer of the infiltration gutter. By arranging an infiltration basin provided with a weir at the end or a permeation-side groove provided with a weir at the lower end in contact with the permeation basin, the permeation-side groove located on the water side in the flow direction and its underside By providing a weir at the boundary with the infiltration basin located in the area, and further providing a water blocking part covering the underwater end surface of the filling layer around the infiltration-side groove, the filling layer around the infiltration-side groove is A method for constructing a road infiltration facility, which is separated from a packed bed.