JP2009127359A - Drainage structure for side ditch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drainage structure and a drainage method for a side ditch which offer high drainage performance and eliminate a need of a wide construction work to enable easy construction. <P>SOLUTION: The drainage structure 10 for the side ditch includes the side ditch 12, a stepdown sink 14 which is formed as a stepdown recession under the side ditch 12 by cutting out the bottom of the side ditch 12 and receives water from the side ditch 12, a direct drain pipe 16 through which water received by the stepdown sink 14 flows directly to a gravel layer area 202 that is an underground layer located deeper than the stepdown sink 14 in the underground, and a bridge device 20 which forms a board surface 42 that is approximately flush with the bottom face of the side ditch 12 in the stepdown sink 14 to usually ensure waterflow along the side ditch 12 and has an overflow mechanism 18 that when more than a given amount of water flows through the side ditch 12, causes water to overflow into the stepdown sink 14 via a hole connecting the stepdown sink 14 communicatively to the side ditch 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gutter drainage structure and method.

  For example, there are many places where the ground is paved with concrete or asphalt, such as roads, parking lots, residential areas, and parks. In such places, rainwater cannot penetrate into the basement even if it rains, so for example, water on the ground surface will be collected and drained into drainage facilities such as gutters provided on the side of roads etc. Yes. However, the side ditch can collect water efficiently in a short time, but if a large amount of water flows into the side ditch due to torrential rain, etc., the amount of water flowing over the river, flooding the road, etc., exceeding the drainage capacity of the side ditch Increases rapidly and flooding is likely to occur. Recently, urbanization and residential land development have progressed, and the number of areas where roads etc. are easily flooded in a short time due to local heavy rain due to global warming or heat island phenomenon has increased, causing serious human and property damage. It has become. In addition, problems such as reduction and depletion of groundwater due to the infiltration of water into the ground have occurred.

  Various techniques for preventing and mitigating flooding of roads due to torrential rain have been proposed. For example, in Patent Document 1, a reservoir is installed on the road bed of the road, and a number of through holes are provided above the reservoir. The road structure which constituted the pavement layer which formed A is disclosed. In the road structure of this patent document 1, when it rains, rainwater flows into the water storage tank through the through hole of the pavement layer that forms the road surface to store the water, thereby improving drainage of the road surface and a large amount. The rainwater was prevented from suddenly flowing into the ditch.

JP 2007-51462 A

  However, in the road structure of Patent Document 1, it is necessary to secure a large capacity of the water storage tank in order to prevent flooding, and a wide range of places, for example, several hundred meters to more than the road in the longitudinal direction of the road. It was necessary to install a water tank and a pavement layer with a through hole in a continuous place along As a result, there has been a problem that the construction becomes large-scale, the construction takes a lot of labor and cost, and the construction period is prolonged. Moreover, the maintenance after construction was also complicated. In addition, the structure is relatively weak because it has a water permeability in the pavement layer, and when it is installed on a roadway, a special structure for maintaining the strength is required, which further increases the cost and the practicality is low. . Moreover, since the water infiltrated from the pavement layer is structured to flow from the water storage tank to the gutter, the water does not permeate the underground and cannot solve the problem of groundwater conservation.

  The present invention has been made in view of the above-described conventional problems, and one of its purposes is to prevent drainage of roads and the like satisfactorily by draining quickly to the underground side when a large amount of water flows in the gutter, It is an object of the present invention to provide a drainage structure and method for a gutter that can be relaxed and contribute to the maintenance of groundwater, and that can be constructed easily and at low cost without requiring large-scale construction, and that can be easily maintained.

  In order to solve the above-mentioned problems, the present invention includes a side groove 12, a step-down tank 14 that is notched at a part of the bottom of the side groove 12 and is stepped down on the lower side of the side groove 12 and receives water from the side groove 12. The direct drainage pipe section 16 for flowing the water received in the down bath 14 from the down bath 14 to the gravel layer region 202 in the deep underground, and the bottom surface of the side groove 12 in the down bath 14 are substantially flush with each other. A bridge device that forms a board surface 42 and ensures the flow of water to and from the side groove at all times, and a hole that communicates the inside of the step-down tank 14 and the side groove 12 when water of a predetermined amount or more flows in the side groove 12. And a bridge device 20 with an overflow mechanism 18 that causes water to overflow into the down tub 14 via 44, and is constituted by a drainage structure 10 having a side groove. The side groove 12 as the drainage groove may be provided in an arbitrary gradient in the water flow direction corresponding to the gradient of the road or the like, and the board surface 42 of the bridge device 20 corresponds to the bottom surface 122 of the side groove corresponding to the gradient of the side groove 12. It is set to be approximately the same. The size of the step-down tank 14 may be set according to the drainage capacity of the gutter, the topography of the road to be installed, the surrounding environment, and the like. For example, the stepping tank 14 may be set to a length of about several meters along the longitudinal direction of the side groove, and one step tank 14 is provided depending on conditions such as the overall length of the side groove and the width of a road, a parking lot, and the like. Or you may install in multiple places spaced apart by predetermined spacing. Further, the step-down tank 14 may be provided to the same extent as the width of the side groove, or may be provided wide or narrow. Moreover, the step-down tank 14 should just be the structure which flows down water to the direct drainage pipe part 16 side of the underground lower layer side, for example, provides a some hole in a bottom part, arrange | positions a grating, and has water permeability. It is good also as forming with porous concrete. Further, the step-down tank 14 is provided with, for example, a straight pipe that rises from a water-permeable hole provided on the bottom surface, and overflow water from the side groove is provided inside the tank to a predetermined water level and then flows to the direct drain pipe section 16. May be. This makes it difficult for the initial rainfall to flow to the underground side. The pipe diameter of the direct drainage pipe section 16 and the number to be installed may be designed in consideration of the strength of the ground, drainage capacity, and the like. As the gravel layer 202 applied as a drainage layer into the ground by the direct drainage pipe section 16, for example, a sand having a high porosity permeability coefficient is preferable, but sand having a relatively small particle diameter, Either large gravel or mixed sand and gravel may be used.

  Further, the bridge device 20 is a bridge constructed so as to cover the cutout hole 21 formed by cutting a part of the bottom part of the side groove so as to cover the top part by forming a non-covered part (44) in part in a plan view. It is good also as including a member (46). The non-covering portion constitutes a communication hole 44 that communicates the channel of the side groove with the inside of the step-down tank 14.

  Further, the bridging member is a plate member provided on both sides of the notch of the side groove, and may include a plate member 46 including a rising edge portion 48 that rises upward along the non-covering lid portion. For example, the plate member 46 may be formed by notching a hole or a part on the edge side to form a non-covering lid. Depending on the height of the rising edge 48, the amount of water until the bridge device 20 overflows can be adjusted. The height of the rising edge may be set to an arbitrary height according to various conditions such as the size of the side groove, the amount of water flowing into the side groove, and the inclination of the side groove. If the plate member 46 is detachably installed, the plate member 46 and the descending tank 14 can be easily maintained.

  Further, the plate member 46 is formed long in one side with respect to the width direction, and the non-covering cover part (44) may be formed long along both side walls 124 or any one of the side walls of the side groove.

  At this time, a buffer tank 30 for temporarily storing water while flowing a part of the water received in the step-down tank 14 to the direct drainage pipe section 16 may be provided on the lower side of the step-down tank 14. The buffer tank 30 may be filled with a hollow rigid body member that forms a rigid body structure that firmly supports while maintaining a gap, or may be filled with crushed stone, a porous member, or the like. Use is advantageous in terms of strength and water storage rate.

  Further, the direct drainage pipe part 16 may include a pipe member 38 having a plurality of holes 40 perforated around it.

  Further, according to the present invention, a step-down tank 14 is provided in which a part of the side groove 12 is notched and a step-down basin 14 is provided on the lower side of the side groove 12, and from the step-down tank 14 to the deep gravel layer area 202 in the ground. A direct drainage pipe portion 16 for flowing water in a straight line is provided, and an overflow mechanism 18 including a bottom surface of a side groove provided in the step-down tank 14 and a substantially flat board surface 42 and a hole 44 communicating with the step-down tank is provided. When water up to a predetermined amount of water flows through the bridge device 20, while ensuring the flow path with the side groove and flowing the water, when water over a predetermined amount of water flows, it is allowed to overflow into the step-down tank 14, The overflow water received by the step-down tank is drained into the gravel layer region 202 through the direct drainage pipe section 16 in a straight line, and is constituted by a side groove draining method.

  According to the drainage structure of a side groove of the present invention, a side groove, a step-down tank that is notched at a part of the bottom of the side groove and is stepped and recessed on the lower side of the side groove, and receives water from the side groove, and a step-down tank The drainage pipe that allows the received water to flow directly from the step-down tank to the deep gravel layer in the ground, and the board surface that is substantially flush with the bottom surface of the side groove in the step-down tank, is always in contact with the water in the side groove. A bridge device that secures the flow of water, with an overflow mechanism that overflows water into the step-down tank via a hole that communicates the inside of the step-down tank and the side groove when more than a predetermined amount of water flows in the side groove. When a large amount of water flows through the side ditch due to heavy rain, etc., it always flows through the bridge device with an overflow mechanism. Overflow of water into the down bath and further penetration into the ground Because it drains directly to the high gravel layer through the direct drainage pipe, it can achieve high drainage capacity to the ground side and drain quickly, resulting in flooding of roads and the like. Can be satisfactorily prevented and mitigated, and can be eliminated in a short time even if flooding occurs. In addition, it is not necessary to continuously provide along long side grooves combined with high drainage capacity, for example, it is only necessary to construct a plurality of specific points separated from each other, so that the construction does not become large scale, It can be installed at low cost and is highly practical. Furthermore, with a bridge device with an overflow mechanism, for example, water containing lead, heavy metals, oil and dust collected from the ground surface at the beginning of rainfall, etc., is caused to flow downstream by the gutter function and flow into the underground as much as possible. In addition, when a lot of rain falls, the penetration of the initial rainfall into the ground side can be delayed as much as possible, which is also effective for groundwater conservation.

  In addition, the bridge device includes a bridging member constructed so as to cover a cutout hole formed by cutting out a part of the bottom portion of the side groove so as to cover a cover from above by forming a non-covered part in a plan view. By doing so, the bridge device that forms the communication hole by the non-covering cover portion and secures the flow of water with the side groove by the bridging member can be manufactured at a low cost with a simple structure.

  Further, the bridging member is a plate member provided on both sides of the notch of the side groove, and is constituted by a plate member having a rising edge portion that rises upward along the non-covering lid portion. A plate member with a recess and other parts that forms an uncovered lid is passed over the notch of the side groove to easily form a flat surface that is flush with the bottom surface of the side groove, and the rising edge provides a more reliable overflow mechanism. And it can be implemented with a simple structure.

  In addition, the plate member is formed long in one side, and the non-covering cover is formed long along both side walls or any side wall of the side groove, so that water from the side groove is formed on the plate member. When flowing, the rising edge portion does not hinder the flow smoothly and smoothly flows, and a relatively large communication hole from the side groove by the non-covering lid portion to the step-down tank can be secured. Therefore, only when the amount of water higher than the rising edge flows, the excess water is surely overflowed into the down bath, while effectively preventing the initial rain water that contains heavy metals and dust from flowing out into the down bath. it can. In addition, since it does not obstruct the flow of water, dust and the like are not easily caught, and the maintenance interval can be extended. Furthermore, for example, it can be manufactured simply and at a low cost simply by forming a rising edge at the edge of the plate member.

  In addition, a buffer tank that temporarily stores water while flowing a part of the water received in the down tank to the direct drainage pipe section is provided on the lower side of the down tank. Even when a large amount of water exceeding the drainage capacity of the drainage pipe flows into the underground side from the step-down tank, it can be temporarily stored in the buffer tank, which is more effective in preventing and mitigating flooding and flooding.

  In addition, the direct drainage pipe part includes a pipe member having a plurality of holes perforated in the periphery, so that water passing through the direct drainage pipe part is disposed on the surrounding ground side through which the direct drainage pipe part passes. As a result, the drainage capacity can be improved by utilizing the permeation or water storage effect of the surrounding ground.

  Further, according to the drainage method of a side groove of the present invention, a step-down basin is provided by notching a part of the side groove and being stepped down and recessed on the lower side of the side groove. A bridge device with an overflow mechanism including a direct drainage pipe portion that allows water to flow directly through the area, and includes a bottom surface of a side groove provided in the step-down tank, a substantially flush surface, and a hole communicating with the step-down tank. Thus, when water up to a predetermined amount of water flows, water is flowed by securing a flow path with the side groove, and when water of a predetermined amount or more flows, it is allowed to overflow into the step-down tank. Since it is configured to drain the overflow water received directly to the gravel layer through the direct drainage pipe, it can realize high drainage capacity to the underground side and drain it quickly, so roads etc. It can prevent and mitigate flooding and flooding well. It can flood the like is eliminated in a short time even if it occurs. At the same time, it is not necessary to continuously install along long gutters together with high drainage capacity, and it is only necessary to construct a plurality of specific locations separated from each other. And practicality is high. Furthermore, for example, water containing lead, heavy metals, oil and dust collected from the ground surface at the beginning of the rain flows to the downstream side by the gutter function and does not flow to the underground as much as possible. When falling, it is possible to delay the infiltration of the initial rain water into the ground as much as possible, which is also effective for groundwater conservation.

  Hereinafter, a drainage structure and method for a side groove according to the present invention will be described with reference to the accompanying drawings. The gutter drainage structure and method of the present invention is applied to a gutter as a drainage gutter provided on the side of, for example, a road, a parking lot, a park, a residential area, a public facility, and the like. When water flows into the ground, it can be drained smoothly and quickly to the underground side to prevent, mitigate, or quickly eliminate flooding and flooding. 1 to 6 show an embodiment of the drainage structure and method of a side groove according to the present invention. In this embodiment, the side groove drainage structure 10 includes a side groove 12, a step-down tank 14, a direct drainage pipe portion 16, and a bridge device 20 with an overflow mechanism 18, as shown in FIGS. is doing. Although this embodiment demonstrates in the aspect applied to the side groove 12 formed by the side of the road 100 of asphalt pavement or concrete pavement, for example, it is applicable not only to a road but other arbitrary places, such as a parking lot and a park. As shown in FIGS. 2 and 3, the road 100 has the same structure as a known road. For example, the ground is cut or embanked to form a road body, etc., and the road bed 102 and the lower road bed 104 are layered from below. The upper layer roadbed 104 and the surface layer 106 are formed.

  As shown in FIGS. 1, 4, and 6, for example, the side groove 12 is integrally provided with a bottom wall 121 that forms a flow channel therein and an opposing side wall 122 that are open on the top surface and in a substantially U shape. The concrete U-shaped groove block 12a made of concrete is provided by being continuously arranged along the road beside the road. On the upper end side of both side walls 122 of the U-shaped groove block 12a, a concave groove 24 is provided in which a closing lid 22 that covers and closes the inside of the flow path is fitted.

  The step-down tank 14 is a tank part that is notched at a part of the bottom of the side groove 12 and is recessed on the lower side of the side groove 12 and receives water from the side groove 12. The step-down tanks 14 are provided at portions separated from each other at intervals of, for example, about 50 m to 100 m with respect to the side grooves 12 that are formed long on the side of the road. Each of the step-down tanks 14 has a longitudinal length of, for example, , About 6 m. In addition, the installation position, the number, the size, and the like of the descending tank 14 are appropriately set according to the size of the side groove, the surrounding road, and the like. In this embodiment, as shown in FIGS. 1, 3, and 5, the step-down tank 14 is, for example, a step-down with a U-shaped cross section in which a side wall 124 that is continuous with the side wall of the side groove 12 is integrally formed. Formed by block 12b. The step-down block 12b is, for example, a concrete secondary product, and a bottom wall 123 having substantially the same width as the U-shaped groove block 12a and both side walls 124 higher than the side walls of the U-shaped groove block 12a are U-shaped. It is composed of a deep groove U-shaped block integrally formed with. A concave groove 24 into which a closing lid 22 for closing the inside from above is fitted is provided on the upper end side of both side walls 124 of the step-down block 12b, and the closing lid 22 is fitted as necessary. Can be removed and the inside can be maintained. If the deep groove step-down block 12b is connected in a state where the side wall upper ends are aligned instead of a part of the U-shaped groove block 12a forming the side groove 12, a part of the channel bottom wall of the side groove is formed at the step-down block 12b. Is formed in a substantially rectangular shape that is long in one side in plan view, and a step-down tank 14 having the same width as the side groove channel is formed below the notch hole 21. In other words, the upper side of the step-down block 12b becomes a side groove flow path continuously with the flow path formed by the U-shaped groove block 12a, and the step-down tank 14 is formed in the lower space side. The end face side of the step-down tank 14 in the flow path direction is closed by a closing wall 141 facing each other, and the step-down tank 14 is open horizontally and surrounded by the block side walls 124 and the closing wall 141 on the four sides. A substantially rectangular parallelepiped recessed space is formed. The bottom wall 123 of the step-down tank 14, that is, the bottom wall 123 of the step-down block 12b, has a water-permeable hole 26 penetrating vertically, and allows the water received in the step-down tank 14 to penetrate into the ground. A filter 28 that allows water to flow while collecting relatively large dust or mud is fitted into the inlet of the water-permeable hole 26. The filter 28 is provided, for example, like a cap that protrudes upward in an arc shape. As shown in FIGS. 1 and 2, the step-down tank 14 also functions as a so-called mud storage tank that receives mud, small garbage, etc. flowing along the flow path of the side groove together with water. A single grain crushed stone 29 for filtering mud and dust to some extent before flowing water to the side is filled. In addition, what is filled in the step-down tank 14 is not limited to single-grained crushed stones, and may be filled with charcoal, a porous body, and other water purifying materials such as arbitrary filter media, bacteria, and culture materials. In addition, the step-down tank 14 is not filled with single-grain crushed stone, but a straight pipe having a certain height is erected in the water-permeable hole 26, and a water inlet is provided on the upper end side of the straight pipe. Also good. In this case, after a certain amount of water has accumulated in the descending tank 14, the water flows into the direct pipe member 16 on the deep underground side, and the drainage can be delayed to some extent in the gravel layer of water. In addition, the descending tank 14 may be formed by installing one descending block 12b, or may have a structure that secures a required length by connecting a plurality of descending blocks 12b in the flow path direction.

  In the present embodiment, as shown in FIGS. 1 and 2, a buffer tank 30 is provided on the lower side of the step-down tank 14. The buffer tank 30 is a storage tank serving as a buffer means on the underground side that temporarily stores water while flowing a part of the water received in the step-down tank 14 to a direct drain pipe section 16 described later. That is, the buffer tank 30 is a buffer means interposed between the step-down tank 14 and the inlet of the direct drainage pipe section 16. The buffer tank 30 is provided in a substantially rectangular parallelepiped shape with a certain depth at a position directly below the step-down tank 14, and the direct pipe member 16 is provided on the deep underground side from the bottom surface side of the buffer tank 30. The buffer tank 30 is formed, for example, by excavating the underground portion of the buffer tank 30 with a backhoe before installing the descending block 12b forming the descending tank 14. Non-woven fabric sheet or the like for preventing the collapse of the surrounding ground such as the road bed and the road body and the inflow of mud and the like into the buffer tank 30 on the excavation side surface and the excavation bottom surface of the ground serving as the side surface and the bottom surface of the buffer tank 30 An anti-suction material 32 made of The suction preventing member 32 has a function as a filter and can filter the water flowing down from the descending tank 14 to some extent. Furthermore, the buffer tank 30 is filled with, for example, a hollow hollow rigid body member 34 that is hollow and has irregularities alternately continuous. The hollow rigid member 34 is formed of a hard plastic such as polypropylene, and retains the strength of the rigid structure while forming a high water storage gap by hollow corrugated irregularities. On the uppermost end side of the laminated hollow rigid member 34, a spacer 36 having a corrugated upper end portion as a plane is installed. The suction preventing material 32 is laid on the upper surface side of the spacer 36, and the above-described step-down block 12 b is placed thereon to form the step-down tank 14. The descending tank 14 is not limited to the structure formed by the descending block 12b. For example, a tank body molded with other concrete or resin is disposed below the bottom of the U-shaped block. May be formed.

  As shown in FIG. 1 and FIG. 2, the direct drainage pipe section 16 is a direct drainage to the ground where the water received in the downhill tank 14 is directly passed from the downhill tank 14 to the deep gravel layer 202 area. Means. In the present embodiment, water is drained from the step-down tank 14 through the buffer tank 30 to the gravel layer directly. The stratum below the road varies depending on the construction site, such as the area and location, but for example, the soil layer 200 is formed of red soil, black soil, other silt, etc., which are relatively compact to a few meters below the ground and have few voids. An example in which a gravel layer 202 having many voids in which sand and gravel are mixed is formed under the soil layer 200 will be described. The soil layer 200 has less voids and lower water permeability than the gravel layer 202, and even if the water received in the step-down tank 14 from such a soil layer or into the soil layer region is drained, It takes a long time to penetrate and it is difficult to expect high flood prevention and relaxation effects. However, the drainage efficiency is greatly improved by draining the water received in the step-down tank 14 by the direct drainage pipe portion 16 directly to the stratum having high water permeability such as the gravel layer 202 without passing through the soil layer 200. Can be improved, and high flood prevention and mitigation effects can be realized. For example, when excavating the ground to form the buffer tank 30, the direct drain pipe 16 is excavated from the bottom surface of the buffer tank 30 to the lower ground by an auger or the like with a few meters to 10 m. An excavation hole 37 having a diameter of about 200 mm that communicates with the gravel layer 202 is formed, and a plastic pipe member 38 having a diameter of about 100 mm such as vinyl chloride is inserted into the excavation hole. The gap between the pipe member 38 and the excavation surface of the excavation hole 37 is filled with single-grain crushed stone, and the collapsing of the excavation hole 37 is prevented. As shown in the figure, a plurality of holes 40 are formed around the pipe member 38, and in addition to direct drainage to the gravel layer 202, one of the water passing through the pipe member 38 through the plurality of holes 40. Can penetrate into the ground (the soil layer on the upper side of the gravel layer) penetrating the part, and the drainage capacity can be improved.

  As shown in FIGS. 1, 2, and 3, the bridge device 20 is provided in the step-down tank 14, and is stepped from the board surface 42 that is substantially flush with the bottom surface 122 of the side groove 12 and the flow path of the side groove 12. And a communication hole 44 communicating with the inside of the descending tank 14. A rising edge 48 rising upward along the edge is formed at the edge of the communication hole 44, and the overflow mechanism 18 includes the rising edge 48. As shown in FIG. 3, the bridge device 20 with the overflow mechanism 18 always ensures the water flow F by the side groove 12 by the board surface 42 and the rising edge 48 when the water less than the predetermined amount of water flows. Thus, when water of a predetermined amount or more flows, the water overflows into the step-down tank 14 through the communication hole 44 beyond the rising edge 48.

  In the present embodiment, as shown in FIGS. 3, 4, and 5, the bridging device 20 includes a notch 21 having a rectangular shape in plan view formed in the step-down block 12 b as a part of the non-covering portion in plan view. And a bridging member provided to cover from above. The bridging member includes a plate member 46 that extends over the notch hole 21 and connects the bottom surfaces 121 of the U-shaped groove blocks 12a on both sides of the descending block 12b to secure a flow path. Specifically, the plate member 46 is made of a horizontally long metal plate member having a length substantially the same as the length of the cutout hole 21 in a plan view, for example. The plate member 46 has a constant width that is slightly narrower than the flow path width of the side groove in the intermediate main body portion that covers the notch hole, and both ends of the notch hole connected to the U-shaped groove block 12a are tapered. A non-covering portion is formed by notching the both sides of the opposite long side into an elongated substantially trapezoidal shape so as to have the same width as the channel width of the side groove, And a rising edge 48 rising upward along the portion. That is, the plate member 46 is formed narrower than the channel width of the side groove, thereby forming a long non-covered portion along the both side walls 124 of the step-down block 12b. The non-cover portion and the side wall 124 of the step-down block are formed. A hole penetrating vertically in the shape of a trapezoid in the shape of a horizontally long plan view surrounded by is a communication hole 44. The rising edge 48 is composed of, for example, a narrow band plate-like portion that is erected and fixed in an L-shape from the plate main body portion along the non-covering lid portion, that is, along the formation edge of the communication hole 44. For example, the height is set to be about several centimeters and sufficiently lower than the height of the side wall 124 of the step-down block. Basically, the non-covering portion and the rising edge portion 48 may be formed in the middle of the plate member 46, but in this case, the rising edge portion hinders the flow of water. Therefore, for example, garbage is likely to be clogged and maintenance is required, or water containing a lot of heavy metals and oil collected from the road at the beginning of rain gets over the rising edge 48 in the flow path and enters the underground from the downhill tank. May flow to the side. When the non-covering cover is provided on the side wall 124 side as in this embodiment, the flow of water is smoothly maintained while the flow of the initial rain water to the underground side is favorably prevented, and the amount of water increases. In this case, excess water can overflow into the down bath 14 reliably and efficiently. The plate member 46 is supported from below by a plurality of support rods 50 laid in the width direction on the upper side of the step-down tank 14, and the bottom wall of the U-shaped groove block 12 a with the upper surface of the plate member 46 as the board surface 42. It is set so as to be substantially flush with the (bottom surface of the side groove) 122. The support rod 50 that supports the plate member 46 is formed with fixing pieces 52 bent in an L shape at both ends, and is fixed to the side wall 124 of the step-down block via screws or the like (not shown). A portion of the support rod 50 that receives the plate member 46 is formed with a pair of positioning pieces protruding upward so as to position the plate member 46, and the plate member 46 is placed between the positioning pieces. Just detachable. In addition, the support structure of the plate member 46 is not limited to the support rod, but, for example, an L-shaped piece fixed to the side wall, a structure in which a step portion is formed on the side wall and fitted to the step portion, or suspended from the closure lid Any other configuration such as a configuration supported by a rod body may be used.

  For example, when constructing the drainage structure of the side gutter according to the present embodiment in the existing gutter 12, first, an underground part including a part of the existing road is excavated by a backhoe or the like corresponding to the installation location. Set up. At that time, the existing U-shaped groove block 12a of the corresponding part is removed. A columnar excavation hole 37 is excavated through an auger or the like so as to communicate from the bottom surface of the excavated concave portion to the gravel layer 202 in the deep underground. A plurality of the excavation holes 37 are formed side by side, and a pipe member 38 is inserted into the excavation holes 37, and a single grain of crushed stone is filled between the excavation holes and the pipe member. Form. Thereafter, the sucking prevention member 32 is laid so as to cover the bottom and side surfaces of the recess excavated by the backhoe. The buffer tank 30 is formed by laminating and filling the hollow rigid body member 34 to a predetermined height in the excavation recess in which the sucking prevention material is laid. A spacer 36 is installed on the uppermost side of the laminated hollow rigid member 34 to form a flat surface, and the suction preventing material 32 is laid on the spacer flat surface. On this, the step-down block 12b is mounted, and the step-down block 12b is connected to the U-shaped groove block 12a forming the existing side groove to form the step-down tank 14. The supporting member 50 is fixed to the descending tank 14 and the plate member 46 is installed to form the bridge device 20 with the overflow mechanism 18. The excavation part of the road next to the step-down block 12b is backfilled, and the surface is paved like the existing road so that the road is substantially flush. Similarly, for example, construction is performed at intervals of about 50 to 100 m. Since the drainage structure of the gutter according to the present embodiment has a high drainage function, it is not necessary to continuously work along the long gutter, and only one place needs to be constructed every predetermined interval or when the drainage area is narrow. Therefore, the construction is simple and can be performed at low cost. In addition, the drainage structure 10 of the side groove is not limited to the road where the existing side groove is provided, and may be applied when a road or the like is newly established.

  Next, the operation of the drainage structure for side grooves according to the present embodiment will be described together with the drainage method for side grooves. As described above, the side groove drainage structure 10 is installed. For example, when raining, rainwater flows into the side groove 12 from the road surface and flows through the flow path in the side groove. As shown in FIG. 3, at the beginning of the rain when the amount of water flowing in the side groove 12 is small, the bridge device 20 that forms a flat surface 42 with the side groove 12 ensures the water flow F with the side groove without overflowing, Drain to the downstream side of the side groove in the same way as normal side grooves. Especially at the beginning of rainfall, rainwater collects, for example, lead, heavy metals, oil, mud, dust, etc., and collects in the ditches. There is no flow. Furthermore, when the rain continues for a long time or the amount of water flowing from the road surface to the gutter increases due to heavy rain such as concentrated heavy rain, a part of the water flowing through the bridge device 20 increases the height of the rising edge 48. Overflow is caused to overflow into the step-down tank 14 through the communication hole 44. The overflow water received in the descending tank 14 flows into the buffer tank 30 on the lower side through the water-permeable holes 26 at the bottom of the descending tank 14. The water flowing down into the buffer tank 30 is drained in a straight line to the gravel layer region 202 through the lower direct drainage pipe section 16 while being temporarily stored. In this way, drainage is conducted directly through the highly permeable gravel layer area 202, so even when a large amount of water flows into the gutter, it can be drained from the gutter to the ground side in a short time, overflowing outside the gutter and flooding the road, etc. Can be prevented or mitigated well. Moreover, even when it is flooded, the flood can be eliminated at an early stage. Furthermore, as described above, overflow water is infiltrated into the underground side while preventing inflow of rainwater into the underground side as much as possible, so that groundwater can be well preserved.

  The side groove drainage structure of the present invention described above is not limited to the configuration of the above-described embodiment alone, and may be modified arbitrarily without departing from the essence of the present invention described in the claims. Also good.

  The gutter drainage structure and method of the present invention can be applied to any other place such as a road, a parking lot, a park, a residential area, a public facility, and the like.

It is the schematic explanatory drawing which carried out the longitudinal cross-section along the flow-path direction of the side groove of embodiment of the drainage structure and method of the side groove of this invention. It is a cross-sectional perspective view of the drainage structure of the side groove of FIG. It is the schematic perspective view and action explanatory drawing of a part of drainage structure of the side groove of FIG. It is the top view which removed the cover of the side groove of the drainage structure of the side groove of FIG. It is an enlarged view of the AA line cross section of FIG. It is an enlarged view of the BB line cross section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drainage structure 12 Side groove 14 Step descent tank 16 Direct drainage pipe part 18 Overflow mechanism 20 Bridge apparatus 30 Buffer tank 38 Pipe member 40 Hole 42 Board surface 44 Communication hole 46 Plate member 48 Rising edge part

Claims (7)

Gutters,
A step-down tank that is notched at a part of the bottom of the side groove and is recessed on the lower side of the side groove to receive water from the side groove;
A direct drainage pipe that allows the water received in the down bath to flow directly from the down bath to the deep gravel layer in the ground,
A bridge device that forms a board surface that is substantially flush with the bottom surface of the side groove in the step-down tank, and ensures the flow of water to and from the side groove at all times. A drainage structure for a side groove, comprising: a bridge device with an overflow mechanism for allowing water to overflow into a step-down tank through a hole communicating with the inside of the tank and the side groove.   The bridge device includes a bridging member constructed so as to cover a cutout hole formed by cutting out a part of a bottom portion of a side groove so as to cover a cover from above by forming a non-covered part in a plan view. The drainage structure of a gutter according to claim 3.   The drainage structure for a side groove according to claim 2, wherein the bridging member is a plate member provided on both sides of the notch of the side groove, and includes a plate member having a rising edge that rises upward along the non-covering lid portion. The plate member is formed long on one side,
The drainage structure for a side groove according to claim 3, wherein the non-covering cover part is formed long along both side walls or any side wall side of the side groove.   2. A buffer tank for temporarily storing water while flowing a part of the water received in the down tank to a direct drainage pipe section is provided on the lower side of the down tank. The drainage structure of the side groove according to any one of 4.   The drainage structure for a side groove according to any one of claims 1 to 5, wherein the direct drainage pipe portion includes a pipe member having a plurality of holes perforated therein. A part of the side groove is cut out, and a step-down basin is provided on the lower side of the side groove, and a direct drainage pipe that allows water to flow directly from the step-down basin to the deep gravel layer in the ground. Set up
When water up to a predetermined amount of water flows through a bridge device with an overflow mechanism that includes a bottom surface of a side groove provided in the step-down tank, a substantially flush board surface, and a hole communicating with the step-down tank, In addition to ensuring the passage of water and allowing water to flow over a specified amount of water, it overflows into the down basin, and the overflow water received in the down basin passes directly to the gravel layer through the direct drainage pipe. The drainage method of the gutter characterized by draining into a shape.

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