JP2007239424A - Overflow infiltration and drainage block construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drainage block structure continuously draining rainwater on the road surface or rainwater infiltrating into pavement, to a sewer, and changing over to underground infiltration when the amount of drainage exceeds a fixed level to restrain the amount of outflow. <P>SOLUTION: Precast concrete drainage blocks structured to provide overflow swallowing ports at constant spaces at the height of the ordinary water level or the like at the side face in a water passage part so as to communicate with an outer bottom face recess, are used and continuously installed on an infiltration trench replaced with single grain size crushed stones of high porosity to maintain drainage capacity on the ordinary water level and to restrain the amount of outflow by overflow infiltration on the high water level. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a drainage blocker that is combined with an infiltration to suppress outflow of rainwater.

Conventional rainwater drainage facilities such as ordinary roads, urban sewers, etc., except for rainwater infiltration facilities that use permeable or perforated concrete gutters, pedestrian boundary L-type, U-shaped gutter, pipe gutter gutter, free It uses a drainage block such as a sloped ditch to continuously collect surface water and permeation through the pavement from the side along the road and discharge it to the end of the road. During high water levels, the burden on sewers and rivers increases.
In addition, the design of discharge facilities based only on the flow capacity contributes to a decrease in the amount of groundwater, etc., and drainage capacity at a normal water level under conditions suitable for the introduction of topography / geological infiltration facilities with high infiltration capacity and low groundwater level. However, it is also required that the high water level also serves to suppress the outflow by overflow infiltration.
JP-A-11-50517 JP 2000-345508 A

  In drainage facilities that discharge road surface rainwater and pavement permeation to sewers, etc., drainage volume is maintained at the same time while maintaining normal discharge from the cross section of water flow under conditions suitable for infiltration facilities such as topography and geology with low infiltration capacity and low groundwater level. If a certain level is exceeded, the excess will be diverted to overtopping and a drainage block will be obtained that can control the amount of rainwater runoff.

Using a precast concrete drainage block provided with an overflow outlet communicating with the outer bottom recess at the height of the level of the inner surface along the flow of the water flow portion, a single-grain crushed stone with a high porosity, for example, a particle size range of 20 to Replace the crushed stone with a 40mm porosity 30-40% to prevent the inflow of earth and sand with a water permeable sheet, or lay a drain block continuously on the water permeable trench where a water permeable pipe etc. is embedded in it. While maintaining constant discharge from the cross section to the sewer, etc., when the water level rises, the water falling from the overflow port is received and penetrated only by the top surface of the infiltration trench.
In this case, a hollow storage portion is formed by the concave portion on the outer bottom surface of the drainage block and the upper surface of the permeation trench, and the falling water spreads and permeates as a water spill reservoir.

  While draining as planned, the road function etc. can be maintained by using only the high water level for drainage as planned, and at the same time, it is possible to reduce the burden on sewers and rivers by controlling the outflow.

  The drainage capacity is the same as the conventional one in hydraulic calculation, and economic design by reducing the cross section of water flow is possible by taking into account the overflow infiltration.

  A water flow is generated in the low water part every rain, and the water flow surface can be maintained in the same way as the conventional method.

The location of the overflow port is higher than the low water flow section, and it is difficult for sediment to flow in.
Furthermore, vacuum can be used, and it is suitable for maintenance management such as cleaning of side grooves.

  Since all the overflow water flows into the hollow reservoir, no replacement material is required along the outside of the drainage block, so the width of the drainage block and the infiltration trench are almost the same. Construction can be done without spreading.

  As with conventional products, drainage blocks are suitable for factory production and can be easily and inexpensively formed with overflow ports, drop ports and outer bottom recesses.

  The drainage block has an overflow opening on the inner wall of the water flow section that communicates with the recess on the outer bottom surface, and is continuously laid on the top surface of the previous infiltration trench. Although it is provided so as not to reduce, it is also possible to embed another processed product such as plastic.

Since the infiltration trench is formed by replacing the original roadbed with single-grain crushed stone having a high porosity, the drainage block is supported by a cradle and the replacement material is not compacted.
Further, the permeation trench is not limited to the crushed stone method, and various methods such as assembling a plastic material, a porous material made of concrete, and a perforated product are also possible.

It is common to use a long product for the P-type road boundary L-type block, and to install a cradle every span of 2m in accordance with the block length. Suitable for part construction.
In addition, it is also possible to appropriately use one without an inflow port, for example, alternate laying according to design conditions.

FIG. 1, FIG. 3 and FIG. 4 show the construction state of the embodiment.
FIG. 1 shows an embodiment of a drainer using an L-shaped drainage block at the boundary of a pedestrian road and installed on a previously formed infiltration trench. FIG. 2 shows a dropped lid side groove. FIG. 3 shows a pipe side groove. FIG. 4 shows an embodiment of a drainage work in which a drainage block of a gate-type free-gradient gutter is installed on an infiltration trench.

In the embodiment of FIG.
An L-shaped drainage block (1A) for a pedestrian road boundary is installed on a water permeable trench (20) formed in advance using a cradle (2).
The water permeable trench (20) is provided with sand (12) in the excavated groove and filled with a single-grain crushed stone having a high porosity as a replacement material (11). In this case, the water-permeable sheet (13A) is interposed on the side surface of the crushed stone.
In many cases, a porous permeated pipe is buried in the crushed stone, but this embodiment is a case of crushed stone only.
As shown in FIG. 10, the cradle (2) has the width, thickness, and length necessary for placing the drainage block (1A) and transmitting the design load to the foundation.
The drainage block (1A) has an outer bottom surface recess (3) by means of longitudinal flanges (6A) (6A) on both sides along the water flow direction of the bottom surface, and is installed on the top surface of the permeation trench (20) via a filter (13B). In order to maintain the porosity of the replacement material (11), the cradle (2) is used to form the hollow storage portion (10) shown in FIG. 5 and FIG.
As shown in FIGS. 5, 6, and 10, the upper water passage portion of the drainage block (1 </ b> A) is connected to the upper side of the low water passage portion (22) from the overflow port (4) to the outer bottom surface recess (3) hollow storage portion (10 ) Are provided at equal intervals. In this embodiment, the filter (13B) is previously attached to the outer bottom surface of the drainage block (1A).
The hollow storage part (10) constitutes an infiltration trench upper surface storage part that also serves as a water hit from a drop port (5) having an overflow port (4) in the middle of the apron surface of the drainage block.
Further, in this embodiment, as shown in FIG. 6 and FIG. 10, slits (7) are provided at equal intervals in the drainage block (1A), and permeable rainwater from the drainage pavement (14) on the impermeable pavement (15) is received. It is what is discharged into the hollow reservoir (10).
What is shown in FIG. 14 is an embodiment of a drain block (1A) equivalent to an L-shaped block, and has a form in which a boundary block having a required shape and dimension is placed on the step (23).

In the embodiment of FIG.
The drainage block (1A) of the dropping lid side groove is installed on the permeation trench (20) formed in advance using the cradle (2).
The cradle (2) has the width, thickness, and length necessary for placing the drainage block (1A) and transmitting the design load to the foundation, and is used so that the infiltration trench (20) is less likely to be consolidated. Yes.
The drainage block (1A) is a combination of the cover plate (1C), and as shown in FIG. 11, the longitudinal flanges (6A) (6A) on both sides along the water flow direction of the bottom face and both ends perpendicular to the water flow direction. The outer bottom concave portion (3) surrounded by the transverse flanges (6B) and (6B) provided on the inner surface of the infiltration trench (20) as shown in FIG. The installation is completed by forming the portion (10) on the outer bottom surface.
As shown in FIG. 7 and FIG. 11, the drainage block (1A) communicates with the upper side of the low water section (22) from the overflow port (4) to the outer bottom recess (3) hollow storage section (10). Drop ports (5) are provided at equal intervals. In this embodiment, the filter (13B) is previously attached to the outer bottom surface of the drainage block (1A).
The hollow storage part (10) constitutes an infiltration trench upper surface storage part that also serves as water hitting from the drop port (5) having the overflow port (4) as a mouth.

In the embodiment of FIG.
The drainage block (1A) in the pipe gutter side groove is installed on the infiltration trench (20) formed in advance using the cradle (2), and has a rainwater inlet (21) on the upper surface. Yes.
The cradle (2) has a width, thickness and length necessary for placing the drainage block (1A) and transmitting the design load to the foundation, and is used so that the infiltration trench (20) is less likely to be consolidated. .
As shown in FIG. 12, the drainage block (1A) has longitudinal flanges (6A) (6A) on both sides along the water flow direction of the bottom surface and transverse flanges (6B) (6B) provided at both ends perpendicular to the water flow direction. As shown in FIG. 8, an installation hollow storage part (10) is formed on the outer bottom surface through a filter (13B) on the upper surface of the infiltration trench (20) as shown in FIG. Is completed.
As shown in FIG. 8 and FIG. 12, the drainage block (1A) communicates with the upper side of the low water portion (22) from the overflow port (4) to the outer bottom recess (3) hollow storage portion (10). The drop openings (5) are provided at equal intervals. In this embodiment, the drop openings (5) are formed by fixing the contact plates (8B) to the vertical grooves (8A). In this embodiment, the filter (13B) is previously attached to the outer bottom surface of the drainage block (1A).
The hollow storage part (10) constitutes an infiltration trench upper surface storage part that also serves as water hitting from the drop port (5) having the overflow port (4) as a mouth.

In the embodiment of FIG.
The drainage block (1A) and the drainage block lower part (1B) of the gate-shaped free-gradient gutter are installed on the permeation trench (20) formed in advance, and have a rainwater inlet (21) on the upper surface. .
The drainage block lower part (1B) forms a low water passage part (22) as shown in FIG. 9 and FIG. 13, but can be stably installed by both footings (9) and (9). Is not used.
As the free-gradient side groove, the drainage block (1A) is placed on the steps (23) and (23) of the in-situ adjusted concrete (16) (16) of both footings (9) and (9) of the drainage block lower part (1B). As shown in FIG. 9 and FIG. 13, the longitudinal flanges (6A) (6A) on both sides along the water flow direction of the bottom surface and the transverse flanges (6B) provided at both ends at right angles to the water flow direction as shown in FIG. 6B) has an outer bottom recess surrounded by 6B), and is installed on the upper surface of the infiltration trench (20) via a filter (13B) as shown in FIG. 9, and a hollow reservoir (10) is formed on the outer bottom surface and installed. Is completed.
As shown in FIG. 9 and FIG. 13, the drainage block lower part (1B) communicates with the upper side of the low water part (22) from the overflow port (4) to the outer bottom recess (3) hollow storage part (10). The drop openings (5) are provided at equal intervals. In this embodiment, the drop openings (5) are formed by fixing the contact plates (8B) to the vertical grooves (8A). In this embodiment, the filter (13B) is affixed to the bottom surface of the drainage block lower part (1B) in advance.
The hollow storage part (10) constitutes an infiltration trench upper surface storage part that also serves as a water hit from a dropping port having the overflow port (4) as a drain.

  The rainwater drainage facilities such as roads have the necessary drainage capacity by making slight improvements to the conventional construction method, and at the same time contribute to environmental rehabilitation by reducing the burden on sewers and rivers and leading to groundwater recharge, and are highly economical Design becomes possible.

The filter may be provided on the upper surface of the infiltration trench in addition to the case where the filter is previously attached to the drainage block at the site construction stage.
Further, the drainage block is not limited to the overflow infiltration method shown in the embodiment, and can be used for various purposes such as direct installation on a foundation without an infiltration trench and installation on base concrete by closing the overflow opening.

The material of the water permeable sheet and the filter is polyester, polypropylene, etc. according to the technical guidelines in general rainwater infiltration facilities, the tensile strength is 30 kgf / 5 cm or more, the water permeability is 10 ^-1 to 10 ^-2 cm / sec or more, and the thickness is 0. .1 to 0.2 mm or more is standard.

  It is a notch slope figure which shows the Example of the walkway boundary L type drainage block for drainage pavement installed on the penetration trench.   It is a notch slope figure which shows the Example of the drop lid side groove | channel drainage block installed on the osmosis | permeation trench.   It is a notch slope figure which shows the Example of the pipe gutter side drainage block installed on the osmosis | permeation trench.   It is a notch slope figure which shows the Example of the portal type free-gradient side ditch drainage block installed on the penetration trench.   It is sectional drawing along the AA line of FIG.   It is sectional drawing along the BB line of FIG.   It is sectional drawing along the AA line of FIG.   It is sectional drawing along the AA line of FIG.   It is sectional drawing along the AA line of FIG.   It is a slope view which shows the Example of the drainage block of FIG.   It is a slope view which shows the Example of the drainage block of FIG.   It is a slope view which shows the Example of the drainage block of FIG.   It is a slope view which shows the drainage block lower part in the Example of FIG.   It is a perspective view which shows the apron block for L type | molds in the other Example of a drainage block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Drain block 1B Drain block lower part 1C Cover plate 2 Receiving base 3 Outer bottom recessed part 4 Overflow port 5 Drop port 6A Longitudinal flange 6B Lateral flange 7 Slit 8A Vertical groove 8B Pad plate 9 Footing 10 Hollow storage part 11 Replacement material 12 Cover Sand 13A Permeable sheet 13B Filter 14 Drainable pavement 15 Impervious pavement 16 Adjusted concrete 20 Infiltration trench 21 Inlet 22 Low water passage 23 Step

Claims (2)

  A rainwater drainage construction method that lays a drainage block with an overflow opening on the inner surface of the water flow passage on the upper surface of the infiltration trench and serves as both overflow penetration and drainage for the high water level above the overflow opening.   The drainage block which comprises the drainage channel construction described in Claim 1.

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