JP2008214859A - Rainwater seepage pit, and construction method for changing existing rainwater pit into rainwater seepage pit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater seepage pit which can prevent the backflow of groundwater and rainwater when a groundwater level is increased, and which enables the rainwater to accurately penetrate into the ground when the groundwater level is decreased. <P>SOLUTION: In this rainwater seepage pit 11, a through-hole 19 is formed in the bottom of a bottomed cylinder-like pit body 12, and a permeation member 22 and a backflow prevention member is mounted in a permeation member storage hole 21 provided below the through-hole 19. The permeation member 22 comprises a pipe 24, the peripheral surface of which is provided with a plurality of through-holes 26, and a permeable strainer 25 which is arranged in the pipe 24. The backflow prevention member 23, which is provided at the upper end of the pipe 24, prevents the rainwater or the groundwater from back flowing into the pit body 12 from the permeation member 22 through the pipe 24. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rainwater infiltration dredge for infiltrating rainwater into the ground and a rainwater infiltration hatching method for an existing rainwater raft.

  In urban areas, urbanization is progressing like a concrete jungle, and the ground surface is paved with concrete and asphalt. As a result, the infiltration area of rainwater has decreased, and the amount of runoff from the ground surface by rainwater has increased. Therefore, a heavy load is applied to drainage facilities such as rainwater pipes during heavy rain, causing urban flooding. In addition, the maintenance of sewage pipes and stormwater pipes has prevented rainwater from penetrating into the ground, reducing the amount of groundwater flowing into rivers. As a result, the natural purification capacity of the river is being lost, which causes water pollution of the river.

  As a countermeasure, a rainwater infiltration dredging that penetrates rainwater that has fallen on paved roads such as roads and parking lots into the ground has been developed and installed in the side grooves of roads and parking lots. In areas where rivers and lakes need to be purified, it is recommended by local governments to install rainwater infiltration basins in order to allow rainwater that falls on roofs, etc., to penetrate into the ground within each household premises. The spread of rainwater infiltrates has been achieved by providing subsidies for the installation of infiltrates.

  As described above, for example, Patent Documents 1 to 3 disclose rainwater permeation traps that allow rainwater to penetrate into the ground. In the rainwater permeation cage of Patent Document 1, a through hole for allowing rainwater to penetrate into the ground is provided on the bottom surface of the gutter body. In addition, the rainwater permeation cage of Patent Document 2 is provided with a through hole in the wall surface of the gutter body for allowing rainwater to penetrate into the ground. Furthermore, in the rainwater infiltration rod of Patent Document 3, a through hole is provided on the bottom surface of the rod body, and a waterfall pipe for allowing rainwater to penetrate into the ground is connected to the bottom of the through hole.

Patent Document 4 discloses a method of changing an existing rainwater tank into a penetrating tank by forming a through hole in the bottom surface of the existing rainwater tank and providing a filter portion below the through hole.
JP-A-8-319657 Japanese Patent Laid-Open No. 2002-21170 JP 2001-329602 A JP-A-62-99533

  By the way, depending on the area, the groundwater level varies, and in areas where the groundwater level is relatively high (areas below 0 m above sea level), the river water level rises due to the effects of rainfall and sea level rise. And the groundwater level goes up. In such an area, when a rainwater infiltration basin such as Patent Documents 1 to 3 is provided, or when an existing rainwater basin is changed to a rainwater infiltration basin as in Patent Document 4, for example, the groundwater level rises during precipitation. There is a concern that groundwater and rainwater will flow back into the rainwater infiltration basin. In addition, the groundwater level is low during drought periods, etc., but in areas where the groundwater level is high during the period when water is drawn into the fields, or in areas where the permeation layer is relatively close to the ground even in hilly areas, the groundwater level is low. There is a concern that the water will flow back to the rainwater seepage. This backflowed water (groundwater and rainwater) flows into the main pipe of the rainwater pipe, and the amount of drainage increases, which imposes a load on the main processing capacity.

  In addition, when the rainwater infiltration basin is provided in the area as described above, a period of time in which the rainwater infiltration basin is stagnating becomes longer during heavy rain, which is undesirable in terms of hygiene due to springing out of the bow. However, in drought season, it is preferable to reduce the treatment load of the rainwater pipes by infiltrating the rain from the rainwater infiltration trough to the ground.

  The present invention has been made in view of the above problems, and its purpose is to prevent backflow of groundwater and rainwater when the groundwater level rises, and to accurately penetrate rainwater into the ground when the groundwater level is lowered. It is intended to provide a rainwater infiltration hatching method that can be used and a rainwater infiltration hatching method for existing rainwater tanks.

  In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a bottomed cylindrical gutter body having a through-hole formed in the bottom, and a drain connected to a rainwater main pipe provided on a side wall of the gutter body. A tube, a cylindrical body accommodated in a permeation member accommodation hole provided below the through hole, and having a plurality of through holes on a peripheral surface; and a permeable filter material disposed in the cylindrical body. And a permeation member that permeates rainwater that has flowed into the main body into the ground, and a clearance between the inner peripheral surface of the through hole and the outer peripheral surface of the cylindrical body, thereby sealing the clearance and the cylinder A seal member for preventing the body from dropping off, and a backflow preventing member for preventing rainwater or groundwater from flowing back from the penetrating member to the main body of the main body through the cylindrical body, provided at the upper end of the cylindrical body The gist of this is a rainwater permeation dredge characterized by comprising

  According to the first aspect of the present invention, the through hole is formed in the bottom of the bottomed cylindrical bag main body, and the permeation member is accommodated in the permeation member accommodation hole provided below the through hole. . Since this permeation member is configured to include a cylinder having a plurality of through holes on the peripheral surface and a permeable filter material disposed in the cylinder, it is possible to sufficiently ensure a rainwater permeation area. The rainwater that has flowed into the main body can efficiently penetrate into the ground. Further, the seal member is disposed in the gap between the inner peripheral surface of the through hole and the outer peripheral surface of the cylinder, so that the gap is sealed and the cylinder is prevented from falling off. Thereby, it is possible to prevent inundation of groundwater into the main body through the gap between the inner peripheral surface of the through hole and the outer peripheral surface of the cylindrical body. Furthermore, by providing a backflow prevention member at the upper end of the cylinder constituting the permeation member, it is possible to prevent rainwater or groundwater from flowing back from the permeation member to the main body through the permeation member. As a result, it is possible to avoid the problem that the amount of drainage into the rainwater main increases and the processing load on the main increases.

  The invention according to claim 2 is characterized in that, in claim 1, the backflow prevention member includes a weir plate in which a drainage through-hole for draining rainwater flowing into the main body to the permeation member side is formed, And a plate-like float member that is formed using a material having a specific gravity smaller than that of water, and floats the float member when the water level rises, and the barrier plate on the upper surface of the float member The gist is to stop the water by closing the through hole.

  According to the second aspect of the present invention, the drainage through hole is formed in the weir plate of the backflow prevention member, and when the groundwater level is relatively low, the rainwater that has flowed into the main body passes through the through hole and the permeation member side. It is drained into the ground and penetrated into the ground from the penetrating member. Further, when the amount of rainfall increases and the groundwater level rises, the plate-like float member rises as the water level rises. And the drainage through-hole of a weir board is closed by the upper surface of the float member, and water is stopped. If it does in this way, a backflow prevention member can be comprised compactly, and it can prevent that rainwater or groundwater flows backward from an osmosis | permeation member to a ridge body by the backflow prevention member.

  The invention according to claim 3 is the backflow prevention member according to claim 1, wherein the backflow prevention member includes a dam plate in which a drainage through-hole for draining rainwater that has flowed into the main body to the permeation member side, A hemispherical float member formed using a material having a specific gravity smaller than that of water disposed below the weir plate, and the float member is levitated by rising the water level, and the weir on the spherical surface side of the float member The gist is to stop the water by closing the through hole of the plate.

  According to the third aspect of the present invention, the drainage through hole is formed in the weir plate of the backflow prevention member, and when the groundwater level is relatively low, the rainwater that has flowed into the main body passes through the through hole and the permeation member side. It is drained into the ground and penetrated into the ground from the penetrating member. Further, when the amount of rainfall increases and the groundwater level rises, the hemispherical float member rises as the water level rises. And the through-hole of a weir plate is closed by the spherical surface side of the float member, and water is stopped. If it does in this way, the buoyancy of a float member can fully be secured and it can prevent reliably that rainwater or groundwater flows backward from a penetration member to a main part of a ridge.

  According to a fourth aspect of the present invention, in the first aspect, the backflow prevention member includes a weir plate in which a drainage through hole for draining rainwater that has flowed into the main body to the permeation member side, And a self-shaped float member formed using a material having a specific gravity smaller than that of water, and a shaft portion formed at the center of the upper surface of the float member is formed at the center of the barrier plate. The gist of the invention is to float the float member by raising the water level in a state of being inserted into the guide hole, and to stop the water by closing the through hole of the dam plate on the upper surface of the float member.

  According to invention of Claim 4, the drainage through-hole is formed in the dam plate of the backflow prevention member, and when the groundwater level is relatively low, the rainwater that has flowed into the main body passes through the through-hole and is on the side of the seepage member. It is drained into the ground and penetrated into the ground from the penetrating member. Further, when the amount of rainfall increases and the groundwater level rises, the self-shaped float member floats with the shaft portion inserted into the guide hole in the center of the dam plate as the water level rises. And the drainage through-hole of a weir board is closed by the upper surface of the float member, and water is stopped. If it does in this way, the buoyancy of a float member can fully be secured and it can prevent reliably that rainwater or groundwater flows backward from a penetration member to a main part of a ridge.

  A fifth aspect of the present invention is the tubular backflow prevention device according to any one of the first to fourth aspects, wherein the backflow prevention member is detachably connected to an upper end of the cylindrical body located in the through hole. The gist is to provide a member body.

  According to the fifth aspect of the present invention, the backflow prevention member and the permeation member can be separated by removing the cylindrical backflow prevention member main body from the upper end of the cylinder. In this case, it is possible to easily replace the filter material arranged in the cylindrical body of the permeation member, and it is possible to quickly maintain the rainwater permeation tank.

  The invention according to claim 6 is a method of processing an existing rainwater tank buried in the ground and changing it into a rainwater infiltration tank, wherein the bottomed cylindrical fence body constituting the existing rainwater tank is underground And forming a through hole in the bottom of the material while being embedded in the surface, and drilling the soil below the through hole to form a penetrating member receiving hole, and a plurality of through holes on the peripheral surface And a penetrating filter material disposed in the cylinder, and a penetrating member that penetrates rainwater that has flowed into the main body into the ground is disposed in the penetrating member accommodation hole. A member disposing step of disposing a backflow preventing member at the upper end of the tubular body for preventing rainwater or groundwater from flowing back from the penetrating member to the main body through the penetrating member; The gap between the inner peripheral surface of the tube and the outer peripheral surface of the cylindrical body is sealed. One as its gist the rainwater penetration 桝化 method of the existing rainwater basins, characterized in that it comprises a sealing step of providing a sealing member for preventing the falling off of the cylinder.

  According to invention of Claim 6, in a drilling process, a through-hole is formed in the bottom part of the main body of the existing rain water tank with the main body of the existing rainwater tank buried in the ground. Moreover, the soil below the through hole is excavated to form a penetrating member accommodation hole. And in a member arrangement | positioning process, while a penetration member is arrange | positioned in a penetration member accommodation hole, a backflow prevention member is arrange | positioned. Here, since the permeation member includes a cylinder having a plurality of through holes on the peripheral surface and a permeable filter material disposed in the cylinder, the permeation area of rainwater can be sufficiently secured. It is possible to infiltrate rainwater into the ground efficiently. Further, the backflow preventing member is disposed at the upper end portion of the cylindrical body constituting the permeation member, and can prevent rainwater or groundwater from flowing back from the permeation member to the main body through the cylindrical body. Further, in the sealing step, a seal member is provided in a gap between the inner peripheral surface of the through hole and the outer peripheral surface of the cylinder, and the gap is sealed and the cylinder is prevented from dropping from the through hole. In this way, it is possible to change the rainwater tank to a rainwater infiltration tank without digging up the existing rainwater tank from the ground. Therefore, compared with the case where it replaces with a new rainwater infiltration rod, a rainwater infiltration rod can be constructed easily and rapidly, and the construction cost can be suppressed to half or less. In addition, since rainwater or groundwater is prevented from flowing back from the penetrating member to the main body of the cocoon, it is possible to avoid the problem that the amount of drainage to the stormwater main increases and the processing load on the main increases.

  As described above in detail, according to the inventions of claims 1 to 5, it is possible to prevent backflow of groundwater or rainwater when the groundwater level rises, and to accurately penetrate rainwater into the ground when the groundwater level falls. A rainwater seepage can be provided. Moreover, according to the invention of Claim 6, the rainwater penetration hatching method of the existing rainwater tank suitable for constructing the rainwater penetration tank of Claims 1-5 can be provided.

[First Embodiment]

  DESCRIPTION OF EMBODIMENTS A first embodiment embodying the present invention will be described below in detail with reference to the drawings.

  As shown in FIG. 1, the rainwater infiltrating rod 11 of the present embodiment includes a concrete rod main body 12 formed in a bottomed rectangular tube shape. The heel body 12 has a size of, for example, 30 cm in length and width and 90 cm in depth. A drainage pipe 15 is provided on the side wall of the main body 12, and the drainage pipe 15 is connected to the rainwater main pipe 16. Specifically, the rainwater main 16 is provided in the center of the paved road, and the main body 12 is provided in the ground on the shoulders on both sides of the road. Further, an insulator-like upper lid (grating lid) 18 is attached to the opening 17 at the upper portion of the kite body 12, and rainwater that has fallen on the road surface flows into the kite body 12 from the gap of the grating lid 18 and is temporarily stored. It is done. The rainwater stored in the main body 12 is discharged to the downstream rainwater main 16 via the discharge pipe 15 and further flows to the river via the rainwater main 16.

  As shown in FIGS. 1 and 2, a circular through hole 19 is formed at the center of the bottom surface of the heel body 12. And the penetration member accommodation hole 21 is formed in the through-hole 19 by excavating the soil 20 below, and the penetration member 22 and the backflow prevention member 23 are disposed in the penetration member accommodation hole 21.

  The permeation member 22 includes a cylindrical pipe (cylinder) 24 made of a resin such as vinyl chloride, and a strainer 25 disposed in the pipe 24. The pipe 24 has a diameter of, for example, 20 cm and a length of 40 cm, and a plurality of through holes 26 of about 2 cm are formed on the lower peripheral surface where the strainer 25 is disposed.

  A concave groove 24a is cut along the circumferential direction on the outer peripheral surface of the upper end portion of the pipe 24, and a rubber O-ring 28 is disposed in the concave groove 24a. The O-ring 28 seals the gap between the inner peripheral surface of the through hole 19 and the outer peripheral surface of the pipe 24. Further, an iron strip 29 is wound around the upper portion of the O-ring 28 on the outer peripheral surface of the pipe 24, and the drop of the pipe 24 is prevented by the strip 29 coming into contact with the edge of the through hole 19. Is done. In the present embodiment, the O-ring 28 and the strip plate 29 correspond to a seal member.

  A top plate 30 having a plurality of slits 30a (elongate through holes) is disposed at the upper end of the pipe 24 so as to close the opening of the pipe 24. In addition, the eye plate 30 is arrange | positioned in the state which protruded a little rather than the bottom face of the coffin main body 12. FIG. The eye plate 30 functions as a foreign matter removing unit that removes foreign matters (dead leaves, small impurities, etc.) contained in rainwater and prevents the foreign matters from entering the pipe 24.

  The strainer 25 is a permeable filter material having a plurality of fine pores 31 smaller than the through-holes 26, and is formed in a cylindrical shape by winding resin fibers around the core rod 32. Thin metal plates 33 are fixed to both ends of the strainer 25 (core bar 32) so as to sandwich resin fibers. A plurality of through holes 34 are formed in the metal plate 33, and the diameter of the metal plate 33 is slightly smaller than the resin fiber portion. With this configuration, rainwater collected at the bottom of the main body 12 surely penetrates the strainer 25 along the inner wall surface of the pipe 24. The core rod 32 and the metal plate 33 of the strainer 25 are formed using a material that does not rust with rainwater, such as stainless steel.

  The backflow prevention member 23 is provided at the upper end portion of the pipe 24. The backflow prevention member 23 includes a disk-shaped upper dam plate 35 and a lower dam plate 36 having drain through holes 35a and 36a formed in the center, and a material having a specific gravity smaller than that of water (for example, a plastic thin plate or A disk-shaped float plate 37 (float member) formed using a resin plate such as a polyethylene thin plate) and three steady rests 38 formed in an elongated cylindrical rod shape are provided.

  The upper weir plate 35 has the same outer diameter as the inner diameter of the pipe 24, and is fixed to the upper end side on the inner wall surface of the pipe 24. The lower weir plate 36 has the same outer diameter as the inner diameter of the pipe 24, and is fixed at a position spaced apart from the upper weir plate 35 on the inner wall surface of the pipe 24 (for example, an interval of 10 cm). ing.

  Each of the steady rests 38 is fixed to the outer peripheral side of the upper dam plate 35 and the lower dam plate 36 so as to be parallel to the axial direction of the pipe 24. The float plate 37 is disposed in a state of being sandwiched between the upper dam plate 35 and the lower dam plate 36, and each steadying metal fitting 38 is inserted into the edge of the float plate 37. Specifically, tab portions 37a are formed at the edge portion of the float plate 37 at equal angular intervals (an angular interval of 120 °) in the circumferential direction, and the insertion holes 37b are formed at positions corresponding to the tab portions 37a. Is formed. Each anti-rest fitting 38 is inserted into each insertion hole 37 b in the float plate 37, and the float plate 37 moves in the vertical direction (axial direction) along each anti-rest fitting 38.

  In the backflow prevention member 23 configured as described above, when the water level in the pipe 24 rises, the float plate 37 rises as the water level rises, as indicated by a broken line in FIG. At this time, the steady swing metal fitting 38 prevents the float plate 37 from swinging in the lateral direction, and the float plate 37 is guided upward so as to close the drainage through hole 35a. Then, the upper surface of the float plate 37 comes into contact with the lower surface of the upper dam plate 35 to block the drainage through hole 35a, thereby stopping water. A rubber plate 39 (seal member) is attached to a portion of the lower surface of the upper dam plate 35 where the float plate 37 contacts. With this configuration, it is possible to reliably prevent rainwater or groundwater from flowing backward from the penetrating member 22 to the main body 12.

  In addition, a holding portion 38a for holding the float plate 37 is formed below each steady rest metal fitting 38, and when the water level is lowered, the lower surface of the float plate 37 abuts on the holding portion 38a, so that the float The downward movement of the plate 37 is restricted. At this time, rainwater flowing from the drainage through hole 35a of the upper dam plate 35 is drained to the strainer 25 side through the gap between the float plate 37 and the lower dam plate 36 and the drainage through hole 36a of the lower dam plate 36. The

  The rainwater seepage rod 11 of the present embodiment is formed by processing an existing rainwater rod 10 (see FIG. 3) embedded in the shoulder of the road. Below, the processing apparatus for changing the existing rainwater tank 10 into the rainwater penetration tank 11 is demonstrated using FIG.4 and FIG.5. FIG. 4 is a side view of the processing apparatus 40, and FIG. 5 is a front view of the processing apparatus 40.

  As shown in FIGS. 4 and 5, the processing apparatus 40 in the present embodiment includes a main body frame 41, an elevating device 42, a hydraulic motor 43, and a hydraulic unit 44.

  The main body frame 41 includes a base member 46 provided at the bottom thereof, and a frame-shaped guide frame 47 erected vertically from the base member 46. A wheel 48 for moving the main body frame 41 is provided at one end of the base member 46. In the vicinity of the wheel 48 in the base member 46, a horizontal adjustment mechanism 49 for keeping the main body frame 41 horizontal is provided. The horizontal adjustment mechanism 49 includes a bolt 51 that is screwed into a screw hole that passes through the base member 46, and a flat plate 52 that is fixed to the lower end portion of the bolt 51 and supports the main body frame 41. In this horizontal adjustment mechanism 49, by rotating the bolt 51, the protruding amount of the flat plate 52 with respect to the base member 46 is changed, and the level of the main body frame 41 is adjusted.

  The guide frame 47 is provided with a movable member 54 projecting to the front side thereof so as to be movable up and down. A drive chain 55 is provided on the back side of the guide frame 47 along the longitudinal direction (vertical direction) of the guide frame 47, and an operation handle 56 for raising and lowering the movable member 54 via the drive chain 55. Is provided. In the present embodiment, the elevating device 42 is configured by the movable member 54, the drive chain 55, and the operation handle 56. In the lifting device 42, the movable member 54 is raised by rotating the operation handle 56 forward, and the movable member 54 is lowered by rotating the operation handle 56 reversely.

  Further, the upper end portion of a support column 58 extending in the vertical direction is connected to the movable member 54, and the hydraulic motor 43 is provided at the lower end portion (tip portion) of the support column 58. The hydraulic motor 43 is connected to the hydraulic unit 44 via the high-pressure hose 61, and the rotating shaft 62 is driven to rotate when hydraulic oil having a predetermined pressure is supplied from the hydraulic unit 44. A circular concrete cutter (rotary cutting tool) 63 for cutting out concrete is fixed to the tip of the rotary shaft 62 in the hydraulic motor 43. In addition to the circular concrete cutter 63, a screw auger for excavating soil can be attached to the tip of the rotating shaft 62.

  In the present embodiment, a shaft runout prevention metal fitting 65 for preventing the shaft runout is provided in the middle of the column 58 that supports the hydraulic motor 43. As shown in FIG. 6, the shaft runout prevention fitting 65 can be expanded and contracted in a plurality of directions (horizontal directions) orthogonal to the iron plate 66 having a through hole for inserting the support column 58 and the rotation shaft 62 of the hydraulic motor 43. And a plurality of arm portions 67 and an adjustment shaft 68 for adjusting the amount of expansion / contraction of each arm portion 67. In the shaft runout prevention metal fitting 65 of the present embodiment, four arm portions 67 are provided corresponding to the corner portions of the collar body 12 (see FIG. 7). Each arm portion 67 includes a contact member 70 and two joint members 71 whose tips are connected to the contact member 70.

  In the shaft runout prevention metal fitting 65, the iron plate 66 is fixed with long bolts and nuts, and the end portions of the adjustment shaft 68 are inserted into the respective hole portions 69 provided at the four corners of the iron plate 66. A worm is formed on the adjustment shaft 68, and a lower end portion of the adjustment shaft 68 is rotatably fixed via a bearing 73. The base end of the arm portion 67 (joint member 71) is fixed to the adjustment shaft 68. Specifically, one end (upper in FIG. 6) of the arm member 67 is fixed so as not to move in the axial direction, and the other end (lower in FIG. 6) of the end of the joint member 71. The inner screw is formed and fixed so as to be movable in the axial direction while being fitted to the worm of the adjusting shaft 68. That is, by rotating the adjustment shaft 68, the base end of the lower joint member 71 moves in the vertical direction along the adjustment shaft 68. Here, when the adjustment shaft 68 is rotated and the base end of the lower joint member 71 is moved to the lowermost end portion, the joint member 71 becomes parallel to the axial direction, and the arm portion 67 (contact member 70) is inward. Fits in. 6 and 7, when the adjustment shaft 68 is rotated to move the base end of the lower joint member 71 upward, the joint member 71 gradually rises in the horizontal direction. The arm portion 67 (contact member 70) extends in a direction (horizontal direction) orthogonal to the rotation shaft 62.

  In the present embodiment, an adjustment knob 75 is provided at the upper end of each adjustment shaft 68 so that the operator can easily rotate the adjustment shaft 68 by turning the adjustment knob 75. It has become.

  Next, a rainwater infiltration hatching method for changing the existing rainwater tank 10 to the rainwater infiltration tank 11 using the processing apparatus 40 of the present embodiment will be described.

  First, in the pre-processing preparation step, the grating lid 18 of the existing rainwater trough 10 is opened, and rainwater, mud, and the like in the trough body 12 are removed using a vacuum cleaner for construction work. And after making the state which can confirm the bottom of the coffin main body 12, the processing apparatus 40 is arrange | positioned at the upper part of the coffin main body 12. FIG. At this time, in the base member 46 of the processing apparatus 40, the other end portion without the wheel 48 is placed on a convex portion (for example, a square member 53 shown in FIG. 4) disposed on the outer side of the rod main body 12. In this state, by adjusting the horizontal adjustment mechanism 49 on the wheel 48 side, the protrusion amount of the flat plate 52 is changed to keep the main body frame 41 horizontal.

  In the subsequent rotating shaft fixing step, the movable member 54 and the support column 58 are lowered by turning the operation handle 56 of the processing apparatus 40, and the shaft shake prevention fitting 65 and the hydraulic motor 43 provided on the support column 58 are placed inside the rod body 12. Arrange. In this state, the adjustment shaft 68 of the shaft shake prevention metal fitting 65 is turned to adjust the amount of expansion / contraction of each arm portion 67, thereby bringing the contact member 70 of each arm portion 67 into contact with the corner portion of the bag body 12 ( (See FIG. 7). By this shaft runout prevention metal fitting 65, the rotating shaft 62 of the hydraulic motor 43 is fixed so as not to shake in the horizontal direction.

  Thereafter, in the drilling step, the hydraulic unit 44 is operated and hydraulic oil is supplied from the hydraulic unit 44 to the hydraulic motor 43, whereby the hydraulic motor 43 is driven to rotate the circular concrete cutter 63. At this time, the operation handle 56 of the processing apparatus 40 is turned to lower the hydraulic motor 43 through the movable member 54 and the support column 58. Then, as shown in FIG. 8A, the circular concrete cutter 63 is brought into contact with the bottom surface of the main body 12 and a predetermined force is applied to the circular concrete cutter 63 from above. As a result, as shown in FIG. 8B, the bottom surface of the scissors body 12 is cut to form a circular through hole 19. At this time, the cooling water is discharged to the cutting portion by the circular concrete cutter 63, and the frictional heat generated in the circular concrete cutter 63 is cooled.

  After the formation of the through hole 19, the rotation of the hydraulic motor 43 is temporarily stopped, and the circular concrete cutter 63 attached to the tip of the rotating shaft 62 is replaced with a screw auger. Thereafter, as shown in FIG. 8C, the hydraulic motor 43 is driven to rotate the screw auger 64, and the soil 20 below the through hole 19 is excavated by the screw auger 64 to penetrate the penetrating member accommodation hole. 21 is formed. At this time, the soil 20 excavated by the screw auger 64 is removed by a vacuum cleaner for construction work or the like. In addition, after the penetration member accommodation hole 21 is formed, the processing device 40 is moved from the upper part of the bag main body 12 to a position that does not get in the way.

  In the member disposing step, as shown in FIG. 8 (d), the pipe 24 having the strainer 25 and the backflow preventing member 23 mounted therein is disposed vertically in the penetrating member accommodation hole 21. In the present embodiment, the sealing step is performed simultaneously with the member disposing step. That is, the O-ring 28 is disposed in the concave groove 24a at the upper end portion of the pipe 24, and the band plate 29 is wound thereon. Thereafter, the pipe 24 is inserted into the penetrating member accommodation hole 21 from above the through hole 19. Accordingly, the pipe 24 is fixed by the band plate 29 coming into contact with the edge of the through hole 19, and the O-ring 28 is disposed in the gap between the inner peripheral surface of the through hole 19 and the outer peripheral surface of the pipe 24. The gap is sealed. As a result, the permeation member 22 and the backflow prevention member 23 are attached to the bottom of the bag main body 12. Then, as shown in FIG. 1, by attaching the grating lid 18 to the upper part of the bag main body 12, the operation for changing the existing rainwater tank 10 to the rainwater infiltration tank 11 is completed.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the rainwater infiltration rod 11 of the present embodiment, the infiltration member accommodation hole 21 is provided below the through hole 19 formed in the bottom portion of the anther main body 12, and the infiltration member 22 is in the infiltration member accommodation hole 21. Contained. Since the permeation member 22 includes a pipe 24 having a plurality of through holes 26 on the peripheral surface and a permeable strainer 25 disposed in the pipe 24, the permeation area of rainwater is sufficiently increased. The rainwater that has flowed into the main body 12 can be efficiently infiltrated into the ground. In addition, the O-ring 28 is disposed in the gap between the inner peripheral surface of the through hole 19 and the outer peripheral surface of the pipe 24 so that the gap is sealed, and the strip 29 is disposed to prevent the pipe 24 from falling off. Is done. Thereby, it is possible to reliably prevent the infiltration of groundwater into the main body 12 through the gap between the inner peripheral surface of the through hole 19 and the outer peripheral surface of the pipe 24. Furthermore, since the backflow prevention member 23 is provided at the upper end portion of the pipe 24 constituting the infiltration member 22, it is possible to prevent rainwater or groundwater from flowing back from the infiltration member 22 to the main body 12 through the pipe 24. As a result, it is possible to avoid the problem that the amount of drainage into the rainwater main 16 increases and the processing load on the main 16 increases. Further, in the rainwater infiltration tub 11, by providing the backflow prevention member 23, the amount of water flowing into the infiltration member 22 side can be adjusted. Thereby, it can suppress that the earth and sand of the outer periphery vicinity of the pipe 24 are roughened by the effect | action of inflow of rainwater, and the depression of the main body 12 can be prevented.

  (2) Since the backflow prevention member 23 of the present embodiment includes the plate-like float plate 37 as the float member, it can be configured compactly. Further, by providing the steady rest 38, the float plate 37 can be reliably guided so as to close the drain through hole 35a of the upper weir plate 35. Furthermore, since the rubber plate 39 for improving the sealing performance is provided at the contact portion of the upper weir plate 35 with the float plate 37, water can be stopped more reliably.

  (3) In the case of this embodiment, the main body 12 of the existing rainwater tank 10 is processed while being buried in the ground, and a through hole 19 is formed at the bottom thereof, which is provided below the through hole 19. The permeation member 22 and the backflow prevention member 23 are disposed in the permeation member accommodation hole 21. In this way, it is possible to change the rainwater tank 10 to the rainwater infiltration tank 11 without digging up the existing rainwater tank 10 from the ground. Therefore, compared with the case where it replaces with a new rainwater permeable rod, the rainwater permeable rod 11 can be constructed easily and quickly, and the construction cost can be suppressed to half or less.

  (4) In the penetrating member 22 of the present embodiment, since the strainer 25 having a plurality of fine pores 31 smaller than the through holes 26 of the pipe 24 is provided in the pipe 24, dust (gravel or Leaves) can be prevented from entering the inside of the pipe 24. Therefore, it is possible to suppress a decrease in rainwater permeation ability due to clogging of the through holes 26 of the pipe 24. The strainer 25 is formed in a cylindrical shape by winding resin fibers around a core rod 32, and thin metal plates 33 are fixed to both ends so as to sandwich the resin fibers. Thereby, the shape of the resin fiber can be maintained, and consequently the life of the strainer 25 can be extended. Further, since the diameter of the metal plate 33 is slightly smaller than the resin fiber portion, rainwater enters from between the pipe 24 and the metal plate 33 and flows down along the inner wall surface of the pipe 24. It penetrates into the strainer 25. Thereby, rainwater can be efficiently infiltrated into the ground. Further, since the metal plate 33 does not contact the pipe 24, the strainer 25 can be easily attached and detached.

  (5) In the processing apparatus 40 according to the present embodiment, each arm portion 67 of the shaft shake preventing metal fitting 65 is brought into contact with the corner portion of the rod main body 12 so as to prevent the rotation shaft 62 from blurring. In this way, it is possible to reliably prevent blurring of the rotating shaft 62 without damaging the bag main body 12 and the surrounding road as in the case of fixing with anchor bolts, for example. Further, in the shaft shake prevention metal fitting 65, the amount of expansion and contraction of each arm portion 67 can be adjusted by turning the adjustment shaft 68. Therefore, even when the size of the heel body 12 is different, the contact member 70 of each arm portion 67 is attached to the heel body. 12 can be reliably brought into contact. Accordingly, it is possible to reliably prevent the rotation shaft 62 from being shaken, and the through hole 19 can be accurately formed in the bottom surface of the bag main body 12.

  (6) Since the processing apparatus 40 of the present embodiment can keep the main body frame 41 horizontal by the horizontal adjustment mechanism 49, the through hole 19 can be more accurately formed in the bottom surface of the heel main body 12.

  (7) In the processing apparatus 40 of the present embodiment, since the wheel 48 is provided on the base member 46 of the main body frame 41, the processing apparatus 40 conveyed by a car or the like can be easily moved to the work site beside the road. Can do.

(8) In the processing apparatus 40 of the present embodiment, the hydraulic motor 43 is used as the drive device, so that it is not necessary to take measures against leakage due to rain water, cooling water, or the like as in the case of using the electric motor.
[Second Embodiment]

  Next, a second embodiment embodying the present invention will be described. In the present embodiment, the configuration of the backflow prevention member 23 is different from that of the first embodiment. The configuration of the backflow prevention member 23 will be described in detail with reference to FIG.

  As shown in FIG. 9, the backflow preventing member 23 of the present embodiment is detachably provided at the upper end portion of the pipe 24. The backflow prevention member 23 has a cylindrical backflow prevention member main body 81, a disc-shaped dam plate 82 in which a drainage through hole 82a for draining rainwater is formed in the center, and a specific gravity smaller than that of water. A hemispherical float member 83 formed using a material (for example, a plastic thin plate), a steady metal fitting 84 for fixing the float member 83, and a fall prevention plate 85 for preventing the float member 83 from falling. Prepare.

  The backflow prevention member main body 81 has an outer diameter slightly smaller than the inner diameter of the pipe 24, and is inserted into the upper end portion of the pipe 24. On the outer peripheral surface of the backflow prevention member main body 81, a concave groove 81a is cut along the circumferential direction at two locations on the upper side and the lower side, and a rubber O-ring 86 is disposed in the concave groove 81a. ing. These O-rings 86 seal the gap between the outer peripheral surface of the backflow prevention member main body 81 and the inner peripheral surface of the pipe 24 and are fixed to the upper end of the pipe 24 so that the backflow prevention member main body 81 does not fall. .

  The weir plate 82 has the same outer diameter as the inner diameter of the backflow prevention member main body 81, and is fixed to the upper end side on the inner wall surface of the backflow prevention member main body 81. The fall prevention plate 85 is a plate formed in a rectangular shape having a width about half that of the float member 83, and a base end portion thereof is fixed to the lower end side of the inner wall surface of the backflow prevention member main body 81.

  The float member 83 is disposed on the fall prevention plate 85 with its spherical surface facing upward. In addition, the float member 83 is fixed to the inner wall surface of the backflow prevention member main body 81 by a steady metal fitting 84, and rotates in the vertical direction with the fixed portion as a fulcrum. A connecting portion between the float member 83 and the steady rest metal fitting 84 is provided so as to be rotatable with the vertical movement of the float member 83.

  Furthermore, in the present embodiment, a hook 87 for attachment / detachment is provided on the metal plate 33 on one side (upper side in FIG. 9) of the strainer 25, and the hook 87 is hooked by using a working bar or the like. The strainer 25 can be easily attached to and detached from the pipe 24.

  Similar to the first embodiment, an O-ring 28 and a strip plate 29 as sealing members are disposed at the upper end of the pipe 24, and the inner peripheral surface of the through hole 19 and the outer peripheral surface of the pipe 24 are arranged. The gap is sealed and the drop of the pipe 24 is prevented. The eye plate 30 is disposed so as to close the opening of the pipe 24. In the present embodiment, a backflow prevention member main body 81 is connected to the eye plate 30, and the backflow prevention member 23 is attached to and detached from the pipe 24 together with the eye plate 30.

  In the backflow prevention member 23 of the present embodiment, the float member 83 rises as the water level in the pipe 24 rises. At this time, the swing metal fitting 84 prevents the float member 83 from swinging in the lateral direction, and the float member 83 is guided upward so as to close the drainage through hole 82a. The water is stopped by closing the drainage through hole 82 a of the dam plate 82 with the spherical surface of the float member 83. In this case, the buoyancy of the float member 83 can be sufficiently ensured, and it is possible to reliably prevent rainwater or groundwater from flowing backward from the infiltration member 22 to the eaves body 12.

  Further, when the water level is lowered, the float member 83 moves downward and is held on the fall prevention plate 85. At this time, rainwater that has flowed in from the drainage through hole 82a of the barrier plate 82 is drained to the strainer 25 side through the gap below the float member 83 (falling prevention plate 85) and is permeated into the ground by the permeation member 22.

The backflow prevention member 23 according to the present embodiment is provided so as to be detachable from the pipe 24 of the permeation member 22. Therefore, when maintaining the rainwater infiltrating rod 11 that has been used for a long time, the backflow prevention member 23 can be removed from the pipe 24 together with the eye plate 30 after removing the mud and dust accumulated at the bottom of the rod body 12. The strainer 25 can be pulled out of the pipe 24 by hooking a working bar on the hook 87. Then, after the strainer 25 is washed with water to remove mud and the like accumulated therein, it can be inserted into the pipe 24 again and the backflow preventing member 23 can be attached to the upper end of the pipe 24. In addition, you may replace | exchange for the new strainer 25 at the time of this maintenance. By performing such a maintenance work, the penetration capability of the rainwater penetration basket 11 can be restored to the state at the time of construction.
[Third Embodiment]

  Next, a third embodiment embodying the present invention will be described. In the present embodiment, the configuration of the backflow prevention member 23 is different from that of the first embodiment. The configuration of the backflow prevention member 23 will be described in detail with reference to FIG.

  As shown in FIG. 10, the backflow preventing member 23 of the present embodiment is also detachably provided at the upper end portion of the pipe 24 as in the second embodiment. The backflow prevention member 23 includes a cylindrical backflow prevention member main body 91, a disk-shaped dam plate 92 in which a plurality of drainage through holes 92a are formed, and a material having a specific gravity smaller than water (for example, a resin material). A self-shaped float member 93 formed by using a fall prevention member 94 for preventing the float member 93 from dropping is provided.

  The backflow prevention member main body 91 has an outer diameter slightly smaller than the inner diameter of the pipe 24, and is inserted into the upper end portion of the pipe 24. On the outer peripheral surface of the backflow prevention member main body 91, a concave groove 91a is cut along the circumferential direction at two locations on the upper side and the lower side, and a rubber O-ring 96 is disposed in the concave groove 91a. ing. These O-rings 96 seal the gap between the outer peripheral surface of the backflow prevention member main body 91 and the inner peripheral surface of the pipe 24, and are fixed to the upper end of the pipe 24 so that the backflow prevention member main body 91 does not fall. .

  The dam plate 92 includes a ring portion 92b having an outer diameter that is the same as the inner diameter of the backflow preventing member main body 91, and a cross portion 92c formed inside the ring portion 92b. The ring portion 92b and the cross portion 92c A fan-shaped drainage through hole 92a is formed between the two. The barrier plate 92 is fixed to the upper end side of the inner wall surface of the backflow prevention member main body 91.

  The float member 93 has a shaft portion 93a formed at the center of the upper surface thereof, and the fall preventing member is inserted in a state where the shaft portion 93a is inserted into the guide hole 92d formed at the center of the barrier plate 92 (center of the cross). 94. The fall prevention member 94 that supports the float member 93 is provided on the inner wall surface of the backflow prevention member main body 91 so as to project radially inward at a position below the weir plate 92. In the present embodiment, in order to reliably support the float member 93, the fall prevention member 94 has an equiangular interval (90 ° angular interval) in the circumferential direction on the inner wall surface of the backflow prevention member main body 91. It is provided in four places. Further, the tip end side of the fall preventing member 94 is formed in a tapered shape in accordance with the shape of the lower surface of the float member 93.

  Furthermore, also in this embodiment, a hook 87 for attaching and detaching is provided on the metal plate 33 above the strainer 25 as in the second embodiment, and by hooking a working rod on this hook 87, The strainer 25 can be easily attached to and detached from the pipe 24.

  An O-ring 28 and a band plate 29 as sealing members are disposed at the upper end of the pipe 24, and the gap between the inner peripheral surface of the through hole 19 and the outer peripheral surface of the pipe 24 is sealed. Falling is prevented. The eye plate 30 is disposed so as to close the opening of the pipe 24. Also in this embodiment, the backflow prevention member main body 91 is connected to the eye plate 30 so that the backflow prevention member 23 can be attached to and detached from the pipe 24 together with the eye plate 30.

  In the backflow preventing member 23 of the present embodiment, the float member 93 rises as the water level in the pipe 24 rises. At this time, since the shaft portion 93a of the float member 93 is inserted into the guide hole 92d of the barrier plate 92, the float member 93 is prevented from shaking in the lateral direction, and the float member 93 is reliably guided upward. Then, the upper surface of the float member 93 is stopped by closing each drainage through hole 92 a of the dam plate 92. In this case, the buoyancy of the float member 93 can be sufficiently secured, and it is possible to reliably prevent rainwater or groundwater from flowing back from the infiltration member 22 to the main body 12. Further, in the present embodiment, a rubber plate 97 is attached to a portion of the lower surface of the dam plate 92 where the float member 93 contacts. With this rubber plate 97, the sealing performance can be enhanced and water can be stopped more reliably.

  Further, when the water level is lowered, the float member 93 moves downward and is held by the fall prevention member 94. At this time, rainwater that has flowed in from the drainage through hole 92 a of the dam plate 92 is drained to the strainer 25 side through the gap below the float member 93 and is permeated into the ground by the permeation member 22.

  Similarly to the second embodiment, the backflow preventing member 23 of the present embodiment is also provided so as to be detachable from the pipe 24 of the penetrating member 22. Therefore, when maintaining the rainwater infiltrating rod 11 that has been used for a long time, the backflow prevention member 23 can be removed from the pipe 24 together with the eye plate 30 after removing the mud and dust accumulated at the bottom of the rod body 12. The strainer 25 can be pulled out of the pipe 24 by hooking a working bar on the hook 87. Then, after the strainer 25 is washed with water to remove mud and the like accumulated therein, it can be inserted into the pipe 24 again and the backflow preventing member 23 can be attached to the upper end of the pipe 24. In addition, you may replace | exchange for the new strainer 25 at the time of this maintenance. By performing such a maintenance work, the penetration capability of the rainwater penetration basket 11 can be restored to the state at the time of construction.

  In addition, you may change each embodiment of this invention as follows.

  In the first embodiment, the backflow prevention member 23 is provided integrally with the permeation member 22. However, like the backflow prevention member 23 in the second and third embodiments, a tubular shape is provided. A double structure using the backflow prevention member main body may be provided so as to be detachable from the penetrating member 22. Further, as shown in FIG. 11, the backflow preventing member 23 may be detachably provided on the penetrating member 22 by screwing. Specifically, the backflow prevention member 23 in FIG. 11 is a cylindrical member in addition to the constituent members of the first embodiment (the upper dam plate 35 and the lower dam plate 36, the float plate 37, and the steady rest 38). A backflow prevention member main body 101 is provided.

  The backflow prevention member main body 101 has a male screw 101 a formed at the lower end thereof, and is screwed into a female screw 24 b formed at the upper end of the pipe 24. The outer peripheral surface at the upper end of the pipe 24 of the present embodiment is fixed to the inner peripheral surface of the through hole 19 using a seal member 102 (for example, concrete or adhesive). Further, a concave groove 101b is cut along the circumferential direction on the outer peripheral surface of the backflow prevention member main body 101, and a rubber O-ring 103 is disposed in the concave groove 101b. The O-ring 103 seals the gap between the inner peripheral surface of the through hole 19 and the outer peripheral surface of the backflow prevention member main body 101. Further, in the backflow prevention member 23, the upper dam plate 35 is fixed to the inner wall surface of the backflow prevention member main body 101, and the lower dam plate 36 is fixed to the upper dam plate 35 via a steady-state metal fitting 38.

  If the backflow prevention member 23 is configured in this way, it is possible to prevent rainwater or groundwater from flowing back from the penetrating member 22 to the ridge body 12 as in the first embodiment. Moreover, since the backflow prevention member 23 is provided so as to be detachable from the pipe 24 of the infiltration member 22, maintenance of the rainwater infiltration trough 11 (cleaning operation or replacement operation of the strainer 25) can be easily performed. In addition, you may comprise so that the backflow prevention member 23 may be provided in the penetration member 22 so that attachment or detachment is possible using connection means (for example, hook etc.) other than screwing.

  -Although the backflow prevention member 23 of the second embodiment or the third embodiment is detachable from the pipe 24 of the permeation member 22, the backflow prevention member main bodies 81 and 91 are omitted, Similarly to the first embodiment, the pipe 24 may be integrally provided. In this way, the configuration is simplified, and the manufacturing cost of the backflow prevention member 23 can be suppressed.

  When the backflow prevention member 23 is detachably provided on the pipe 24 of the permeation member 22 as in the second and third embodiments, the backflow prevention member main bodies 81 and 91 and the strainer 25 are provided. May be connected using a connecting member such as a wire 111 (see FIG. 12). If it does in this way, at the time of the maintenance of the rainwater penetration rod 11, the backflow prevention member 23 and the strainer 25 can be taken out simultaneously from the pipe 24, and work efficiency can be improved.

  In each of the above embodiments, the float members 37, 83, and 93 have a plate shape, a hemispherical shape, and a top shape. However, the shape is not limited thereto, and may be a sphere, for example. Further, the backflow prevention member 23 does not need to be configured using the float members 37, 83, and 93, and may be configured using, for example, an openable / closable flap (lid member). In this case, rainwater collects in the bag main body 12, the flap is opened by its weight, rainwater is dropped on the penetrating member 22 side, and the backflow prevention member 23 is configured to close the flap when the rainwater is light and light.

  In each of the above embodiments, the strainer 25 formed in a cylindrical shape by winding resin fibers around the core rod 32 is used as a filter material, but is not limited thereto. As the filter material of the osmotic member, for example, a water-permeable material such as crushed stone, glass sphere, thread-like film, cloth film or the like may be used.

  In the above embodiment, the through hole 19 is formed on the bottom surface of the ridge body 12 using the circular concrete cutter 63, but other cutting tools (for example, tools such as a hammer) may be used. Further, instead of the screw auger 64, the penetrating member accommodation hole 21 may be formed using a double scoop or the like. Further, the through hole 19 and the penetrating member accommodation hole 21 may be formed using a rotary cutting tool in which a drill for excavation is placed inside the circular concrete cutter.

  In the above embodiment, the existing rainwater tank 10 embedded in the shoulder of the road is processed, but other than this, the existing rainwater tank 10 embedded in a paved place such as a parking lot or in the garden of each household 10 may be processed to be changed to the rainwater permeation rod 11. Of course, it is not limited to the rainwater penetrating rod 11 formed by processing the existing rainwater rod 10, but using a new rainwater penetrating rod 11 manufactured at the factory and buried in the shoulder of the road or in the garden of each household. May be.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiments described above are listed below.

  (1) The rainwater infiltration trough according to any one of claims 1 to 5, wherein the backflow prevention member is integrally provided on an upper portion of the infiltration member.

  (2) The rainwater infiltration trough according to any one of claims 1 to 4, wherein the backflow prevention member is detachably provided on an upper portion of the infiltration member.

  (3) In any one of claims 1 to 5, the filter material has a plurality of fine pores smaller than the plurality of through holes, and is formed in a cylindrical shape by winding resin fibers around a core rod. The penetrating member is fixed to both ends of the core rod so as to sandwich the resin fiber, and has a diameter slightly smaller than the resin fiber portion. A rainwater infiltration trough further comprising a metal plate and a hook for attachment / detachment provided on the metal plate on the upper end side.

  (4) In the technical idea (2) or (3), a connecting member for connecting the filter material and the backflow preventing member is provided, and the cylindrical body is disposed in the penetrating member accommodation hole below the through hole. A rainwater infiltration trough characterized in that it is disposed vertically and the filter material and the backflow prevention member are inserted into the cylinder.

  (5) The rainwater infiltration tank according to any one of claims 1 to 5, wherein a foreign matter removing portion for removing foreign matters contained in the rainwater is provided at an upper end portion of the backflow preventing member. .

  (6) The rainwater infiltration trough according to any one of claims 2 to 4, wherein a sealing member for improving sealing performance is provided at a contact portion between the barrier plate and the float member.

  (7) The rainwater infiltration tank according to claim 2 or 3, wherein the backflow prevention member further includes a steadying member for guiding the float plate in the vertical direction while preventing lateral shaking. .

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the rainwater osmosis | basket of 1st Embodiment which actualized this invention. (A) is a longitudinal cross-sectional view which shows a penetration member and a backflow prevention member, (b) is a cross-sectional view which shows a backflow prevention member. Sectional drawing which shows the existing rainwater tank. The side view which shows a processing apparatus. The front view which shows a processing apparatus. The top view which shows a shaft runout prevention metal fitting. Explanatory drawing which shows the fixing method by a shaft runout prevention metal fitting. (A)-(d) is sectional drawing for demonstrating a rainwater penetration hatching method. (A) is a longitudinal cross-sectional view which shows the backflow prevention member of 2nd Embodiment, (b) is a cross-sectional view which shows the backflow prevention member. (A) is a longitudinal cross-sectional view which shows the backflow prevention member of 3rd Embodiment, (b) is a cross-sectional view which shows the backflow prevention member. Sectional drawing which shows the backflow prevention member of another embodiment. Sectional drawing which shows the backflow prevention member of another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Existing rainwater tank 11 ... Rainwater infiltration tank 12 ... Main body 15 ... Drain pipe 16 ... Rainwater main pipe 19 ... Through hole 20 ... Earth 21 ... Infiltration member accommodation hole 22 ... Infiltration member 23 ... Backflow prevention member 24 ... As cylinder Pipe 25 ... Strainer as filter material 26 ... Through hole 28 ... O-ring as seal member 29 ... Band plate as seal member 35 ... Upper barrier plate as barrier plate 35a ... Drain through hole 37 ... As float member Float plate 81, 91, 101 ... Backflow prevention member main body 82, 92 ... Dam plate 82a, 92a ... Drain through hole 83, 93 ... Float member 92d ... Guide hole 93a ... Shaft portion 102 ... Seal member

Claims (6)

A bottomed cylindrical bowl body with a through hole formed in the bottom;
A discharge pipe provided on the side wall of the main body and connected to the rainwater main,
A cylindrical body that is accommodated in a permeation member accommodation hole provided below the through-hole and has a plurality of through holes on a peripheral surface thereof, and a permeable filter material that is disposed in the cylindrical body, A permeating member that permeates the rainwater flowing into the body into the ground,
A seal member that seals the gap and prevents the cylinder from falling off by being disposed in the gap between the inner circumferential surface of the through-hole and the outer circumferential surface of the cylindrical body;
A rainwater provided at an upper end portion of the cylindrical body, and comprising a backflow preventing member for preventing rainwater or groundwater from flowing backward from the penetrating member to the main body through the cylindrical body Osmosis.   The backflow prevention member is disposed below the dam plate and has a specific gravity smaller than that of the dam plate formed with a drainage through hole for draining rainwater flowing into the main body to the permeation member side. A plate-like float member formed using a material, the float member is floated by rising the water level, and water is stopped by closing a through hole of the dam plate on the upper surface of the float member. The rainwater permeation dredge according to claim 1.   The backflow prevention member is disposed below the dam plate and has a specific gravity smaller than that of the dam plate formed with a drainage through hole for draining rainwater flowing into the main body to the permeation member side. A hemispherical float member formed using a material, the float member is floated by rising the water level, and water is stopped by closing the through hole of the barrier plate on the spherical surface side of the float member. The rainwater infiltration trough according to claim 1.   The backflow prevention member is disposed below the dam plate and has a specific gravity smaller than that of the dam plate formed with a drainage through hole for draining rainwater flowing into the main body to the permeation member side. A self-shaped float member formed using a material, with the shaft portion formed in the center of the top surface of the float member inserted through the guide hole formed in the center of the dam plate, The rainwater infiltration trough according to claim 1, wherein the float member is levitated and water is stopped by closing a through hole of the barrier plate on an upper surface of the float member.   The said backflow prevention member is provided with the cylindrical backflow prevention member main body detachably connected with the upper end of the said cylinder located in the said through-hole. Rainwater permeation. It is a method of processing an existing rainwater tank buried in the ground and changing it into a rainwater infiltration tank,
The bottomed cylindrical gutter body that constitutes the existing rainwater gutter is processed while being buried in the ground to form a through hole in the bottom thereof, and the soil below the through hole is excavated and penetrated. A drilling step for forming a member receiving hole;
A permeation member that includes a cylindrical body having a plurality of through holes on the peripheral surface and a permeable filter material disposed in the cylindrical body and that permeates rainwater that has flowed into the main body into the ground is accommodated in the permeation member. A member arrangement is provided in the upper end portion of the cylindrical body that is disposed in the hole, and is provided with a backflow preventing member for preventing rainwater or groundwater from flowing back from the penetrating member into the main body through the cylindrical body. Installation process,
Including a sealing step of sealing a gap between the inner peripheral surface of the through hole and the outer peripheral surface of the cylindrical body and providing a sealing member for preventing the cylindrical body from dropping off. Chemical method.

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