JP2009235876A - Rainwater storage structure having ground permeation function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater storage structure having a ground permeation function capable of saving the labor in a construction method and reducing the cost, effectively using a storage space, adding the permeation function corresponding to any optional underground water level in the rain water storage structure, and having the functions of the flood regulation and water utilization of the stored rainwater. <P>SOLUTION: A rainwater storage space 6 is formed of a sidewall 3 formed by placing a hollow circular tube 2 in the ground adjacent thereto in the horizontal direction, and an upper floor slab 4 and a lower floor slab 5, and an intermediate pillar 7 consisting of the hollow circular tube is erected. A part of the hollow circular tube groups 2, etc. form a hollow circular tube 2A for flowing rainwater in which rainwater from the outside flows out in the rainwater storage space 6 through the tube. The other part of the hollow circular tube groups 2, etc. form a hollow circular tube 2B for ground penetration in which a ground penetration hole 13 with rainwater in the rainwater storage space 6 is discharged into the ground through the tube by providing a non-return valve 12 for permitting only the flow-out to the ground in a tubular wall part placed while extending in a deep layer side ground over the lower floor slab 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the present invention, a rainwater storage space is formed by a side wall formed by placing a hollow circular tube adjacent to the ground in the horizontal direction, and an upper floor slab and a lower floor slab, and the rainwater storage space is formed inside the rainwater storage space. The present invention relates to a rainwater storage structure having a ground infiltration function constructed by standing an intermediate pillar composed of a hollow circular pipe.

  With the recent urbanization and residential land development, there is an increasing problem that rainwater does not penetrate into the basement and flows out. As part of this measure, construction of a large-capacity rainwater storage structure that temporarily stores rainwater underground is underway.

  Conventionally, in such a large-capacity rainwater storage structure, the upper floor slab, the lower floor slab and the side wall are generally constructed by cast-in-place concrete. However, in order to improve the problems such as lengthening the construction period due to the cast-in-place concrete method, in recent years, as shown in Patent Documents 1 and 2 below, a method using a precast concrete or a method using a PC wall will be adopted. It has become.

  In the following Patent Document 1, a body section block having an I-shaped longitudinal section in which a column plate portion is connected at a right angle to an intermediate point in the left-right direction between a bottom plate portion and a top plate portion having the same or approximate planar shape is adjacent in the front-rear direction. , Spaced apart in the left-right direction, the bottom open part of the left and right body block is closed with an intermediate bottom plate, the top open part is closed with an intermediate top plate, the front, back, left and right side open parts of this block group In addition, a rainwater storage tank has been proposed which is configured by being closed by peripheral blocks having a U-shaped longitudinal section that is adjacently arranged or spaced apart.

  Further, in Patent Document 2 below, a notch is formed in advance in the outer peripheral part of the PC wall at the joint between the PC wall and the floor slab concrete, and a water-swellable water-stopping material is interposed in the notch. A water stop structure for placing concrete has been proposed.

  On the other hand, in recent rainwater storage structures, not only the structure that suppresses the outflow to the surroundings, but also the function of discharging the stored rainwater into the ground and recharging groundwater as shown in Patent Documents 3 and 4 below, for example. Some have been proposed.

  Specifically, in Patent Document 3 below, a wall portion, an upper floor portion, and a bottom portion that form a storage space are provided, and a penetrating hole that communicates with the storage space is provided in the wall portion or the bottom portion. There has been proposed a rainwater storage and penetration tank that allows rainwater stored in a space to penetrate into the ground through the penetration hole.

Moreover, in the following Patent Document 4, a plurality of box-shaped precast concrete blocks having openings on the side surfaces obtained by connecting the corners of the square top plate and the bottom plate in parallel with columnar portions are formed, and the concrete blocks are A rainwater underground infiltration structure has been proposed in which a structure having a water storage space arranged in the width direction and continuous in the length direction and the width direction is formed, and a water passage opening is provided around the structure.
Japanese Unexamined Patent Publication No. Hei 6-299951 JP-A-11-36334 Japanese Patent Laid-Open No. 11-61953 JP 2005-155229 A

  However, in the construction method using precast concrete according to Patent Document 1, the concrete blocks 52, 52... Are disposed after the temporary earth retaining wall 51 is constructed around the rainwater storage structure 50, as shown in FIG. Since it is necessary, the man-hour for constructing the temporary earth retaining wall 51 is excessive. In addition, since the rainwater storage capacity is reduced by the volume of the concrete blocks 52, 52... Disposed in the rainwater storage space, there is a problem that the space is not effectively used.

  Further, in the construction method using the PC wall body according to Patent Document 2, as shown in FIG. 12, a plurality of PC hollow piles 61, 61.. A wall 62 is constructed. This PC wall body 62 can be used not only as a housing side wall of the rainwater storage structure 60 but also as a temporary earth retaining wall, so that it is not necessary to construct a temporary earth retaining wall as described above. The construction period can be shortened and labor can be saved as compared with the construction method by the method. However, since the PC hollow pile 61 is expensive, there is a problem that the construction cost increases. In addition, the internal space of the PC hollow pile 61 is only used at the time of placing by the medium excavation method, and the internal space after construction has not been used. Thus, in the conventional rainwater storage structure, further labor saving of the construction method and reduction of construction cost have been demanded.

  On the other hand, all of the rainwater storage structures according to Patent Documents 3 and 4 try to infiltrate the stored rainwater into the underground by providing an opening in the bottom or wall. However, in such a rainwater storage structure, there is no problem when the groundwater level is lower than the opening, but when the groundwater level is higher than the opening, the stored rainwater cannot be penetrated into the underground. On the contrary, there is a problem that groundwater penetrates into the storage structure from the opening, and a sufficient storage amount cannot be secured during heavy rain.

  Furthermore, it is expected that the stored rainwater will not only recharge groundwater but also be effectively used in various forms related to healthy water circulation, such as improvement of the heat island phenomenon and conservation of the ecosystem.

  Therefore, the main problems of the present invention are to further save labor and reduce the construction cost of the construction method, to effectively use the storage space, and to add a penetration function capable of accommodating any groundwater level to the rainwater storage structure. Another object of the present invention is to provide a rainwater storage structure having a ground seepage function that has both flood control and water use functions.

In order to solve the above-mentioned problem, as the present invention according to claim 1, a rainwater storage space is formed by a side wall formed by placing a hollow circular tube adjacent to the ground in the horizontal direction, and an upper floor slab and a lower floor slab. A rainwater storage structure formed with an intermediate pillar made of a hollow circular tube inside the rainwater storage space,
A part of the hollow circular tube group is formed with a rainwater inflow port for allowing rainwater from the outside to flow into the tube, and a rainwater outflow for flowing rainwater flowing into the tube from the rainwater inflow port into the rainwater storage space. It is a hollow circular tube for rainwater inflow with a hole,
The other part of the hollow circular tube group is driven to extend to the deep layer ground beyond the lower floor slab, and to the pipe wall portion corresponding to the rainwater storage space, into the pipe A rainwater inflow hole for allowing rainwater to flow into the pipe is formed by providing a check valve that allows only inflow, and a check that allows only the outflow to the ground in the pipe wall portion placed in the deep side ground. By providing a valve, a rainwater storage structure having a soil infiltration function is provided, which is a ground circular infiltration hollow tube having a ground infiltration hole for discharging rainwater to the ground.

  In the first aspect of the present invention, since the side wall of the rainwater storage structure is formed by placing a hollow circular tube adjacent to the ground in the horizontal direction, this side wall is the body side wall of the rainwater storage structure. In addition, since the hollow circular pipe can be used also as a temporary earth retaining wall, labor saving and a reduction in construction cost can be achieved in the construction method of the structure.

  In addition, the side wall and the intermediate column constituting the rainwater storage structure are configured by hollow circular pipes, and a part of the hollow circular tube group is used as rainwater inflow hollow circular pipes to allow rainwater from the outside to flow into the pipes. A rainwater inlet is formed, a rainwater outflow hole is formed through which rainwater flowing into the pipe from the rainwater inlet flows out into the rainwater storage space, and another part of the hollow circular tube group is It is installed by extending to the deep side ground beyond the floor slab, and is provided with a check valve that allows only inflow into the pipe in the pipe wall portion corresponding to the rainwater storage space. A rainwater inflow hole for inflow is formed, and a ground penetration hole for discharging rainwater to the ground is formed by providing a check valve that allows only outflow to the ground in the pipe wall portion placed in the deep side ground. The ground penetration hollow circular pipe.

  Therefore, when the groundwater level of the surrounding ground is lower than the ground infiltration hole, the stored rainwater can be discharged to the ground, and when the groundwater level is higher than the ground infiltration hole, By controlling the water head so that the rainwater level is higher than the groundwater level, the stored rainwater can be discharged to the ground at any groundwater level. Further, even if the groundwater level becomes higher than the rainwater level of the ground penetration hollow circular pipe, the groundwater does not flow in by the check valve provided in the ground penetration hole, so that it is possible to prevent the rainwater storage amount from decreasing.

  As the present invention according to claim 2, there is provided a rainwater storage structure having a ground infiltration function according to claim 1, wherein a centrifugal high-strength concrete pile (PHC pile) by a pretension method is used as the hollow circular pipe. Is done.

  In the invention of claim 2, the material cost can be reduced and the design can be changed by using a centrifugal tension high-strength concrete pile (PHC pile) by a pre-tension method that is widely used as the hollow circular pipe. Can be handled relatively easily.

  As another aspect of the present invention according to claim 3, a rainwater inflow hole for allowing rainwater stored in the rainwater storage space to flow into the pipe is formed in another part of the hollow circular pipe, and the hollow circular pipe is continuous from the inside of the pipe to the ground. A rainwater storage structure having a ground infiltration function according to any one of claims 1 and 2, wherein the water utilization hollow circular tube is provided with a capillary member.

  In the third aspect of the present invention, a rainwater inflow hole for allowing the rainwater stored in the rainwater storage space to flow into the pipe is formed in another part of the hollow circular pipe and is continuous from the inside of the pipe to the ground. By using a hollow circular pipe for water utilization with a capillary member, rainwater stored in the rainwater storage space is sucked up to the ground using the capillary phenomenon of the capillary member, and trees are cultivated and the pavement material is moistened. It will be used for maintaining the state, etc., and it will be possible to provide water utilization functions such as conservation of the ecosystem and improvement of the heat island phenomenon.

  As the present invention according to claim 4, the rainwater inlet is provided with a groundwater infiltration function according to any one of claims 1 to 3, wherein a rainwater filtration device for filtering rainwater flowing into the pipe is provided. A rainwater storage structure is provided.

  The invention according to claim 4 suppresses intrusion of impurities, mud, oil, etc. into the rainwater storage space by providing a rainwater filtration device for filtering rainwater flowing into the pipe at the rainwater inlet, The check valve provided in the rainwater inflow hole and the ground penetration hole of the ground penetration hollow circular pipe is prevented from being clogged.

  The present invention according to claim 5 is provided with a pump for pumping up the rainwater stored in the rainwater storage space and supplying it to the pipe of the ground penetration hollow circular pipe. The rainwater storage structure provided with the ground seepage function described in 1. is provided.

  As a sixth aspect of the present invention, a vacuum for causing rainwater stored in the rainwater storage space to flow into the pipe through the inflow hole for infiltration by making the inside of the hollow circular pipe for ground penetration negative pressure. The rainwater storage structure provided with the ground infiltration function in any one of Claims 1-4 in which the pump is provided.

  The inventions according to claims 5 and 6 are for discharging rainwater forcibly stored to the ground when the groundwater level is high. That is, in the invention described in claim 5, a pump for pumping up the rainwater stored in the rainwater storage space and supplying the pumped water into the pipe of the ground penetration hollow circular tube is described in claim 6. In the present invention, by providing a vacuum pump for causing the rainwater stored in the rainwater storage space to flow into the pipe through the inflow hole for penetration by making the inside of the hollow circular pipe for ground penetration negative pressure, The water level in the ground infiltration hollow circular pipe with the ground infiltration hole is made higher than the groundwater level, and rainwater can be discharged to the ground using the water head difference.

  As the present invention according to claim 7, the hollow circular pipe is formed with a nozzle insertion hole for inserting a water jet nozzle, and the rainwater reservoir having a ground infiltration function according to claim 1. A structure is provided.

  According to the seventh aspect of the present invention, the check valve and the inner wall surface of the tube can be cleaned by forming a nozzle insertion hole for inserting the water jet nozzle in the hollow circular tube.

  As described above in detail, according to the present invention, the construction method can be further labor-saving and the construction cost can be reduced, the storage space can be effectively used, and the rainwater storage structure has an infiltration function capable of accommodating any groundwater level. In addition to this, it is possible to provide a rainwater storage structure having a ground infiltration function that has both flood control and water use functions.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a rainwater storage structure 1 having a ground infiltration function according to the present invention, and FIG. 2 is a plan view thereof.

  The rainwater storage structure 1 is formed by placing a plurality of hollow circular pipes 2 adjacent to each other in the horizontal direction on the ground and applying a water stop structure 15 between the adjacent hollow circular pipes 2 and 2. A rainwater storage space 6 surrounded by the closed side wall 3 in plan view and an upper floor slab 4 and a lower floor slab 5 made of precast concrete or cast-in-place concrete is formed, and inside the rainwater storage space 6 is formed. This is a structure in which intermediate pillars 7, 7.

  In addition, a part of the hollow circular pipe groups 2, 2... Constituting the side wall 3 and the intermediate pillars 7, 7... Is a rainwater inflow hollow for allowing rainwater from the outside to flow into the rainwater storage structure 1. It is a circular tube 2A. As shown in FIG. 3, the rainwater inflow hollow tube 2A is provided with a rainwater inlet 8 that is an upper end opening of the hollow tube that allows rainwater from the outside to flow into the tube. A rainwater outflow hole 9, which is an opening provided in a pipe wall portion below the hollow circular pipe 2, through which rainwater flowing into the pipe from the rainwater inlet 8 flows out into the rainwater storage space 6 is formed. The rainwater outflow hole 9 may be an opening that penetrates the wall surface of the pipe, and the flow between the pipe and the rainwater storage space 6 is freely performed from both directions. The rainwater inlet 8 is provided with a filtration device 14 for removing impurities, mud, etc. in rainwater flowing into the pipe.

  Of the hollow circular tube groups 2, 2 ... constituting the side wall 3 and the intermediate pillars 7, 7 ..., the hollow circular tube groups 2, 2 ... other than those used as the rainwater inflow hollow tubes 2A, 2A ... A part of the inner wall extends to the deep ground beyond the lower floor slab 5 and is a hollow tube 2B for infiltration to recharge rainwater stored in the rainwater storage structure 1 underground. ing. As shown in FIG. 4, the infiltration hollow circular pipe 2 </ b> B is provided with a check valve 10 that allows only inflow into the pipe on the pipe wall portion corresponding to the rainwater storage space 6, thereby allowing rainwater to enter the pipe. Infiltration of rainwater into the ground by forming a rainwater inflow hole 11 for inflow and a check valve 12 that allows only outflow to the ground in the pipe wall portion placed in the deep ground. A hole 13 is formed.

  The hollow circular pipes 2, 2,... Used as the side walls 3 constitute the side walls 3 of the rainwater storage structure 1 by securing at least a predetermined penetration length and placing them on the ground. It can also be used as a retaining wall. For this reason, in the rainwater storage structure 1 which concerns on this invention, it becomes unnecessary to construct | assemble a temporary earth retaining wall separately, and it becomes possible to aim at the labor saving of a construction, and shortening of a construction period.

  By using the hollow circular pipes other than the rainwater inflow hollow circular pipe 2A as a support pile, the load applied to the upper floor slab 4 can be supported. Accordingly, the infiltration hollow circular pipe 2B extends to the supporting ground, and the rainwater inflow hollow circular pipe 2A is supported on the lower floor slab 5 as shown in FIG. Is preferred.

  As the hollow circular pipe 2, it is desirable to use a centrifugal high strength concrete pile (PHC pile) by a pretension method. The hollow circular tube 2 that extends beyond the hollow circular tube 2 constituting the side wall 3 and the lower floor slab 5 to the deep layer side ground can be driven by a known pile driving method. In the present invention, since the check valves 10 and 12 are installed in the ground permeation hollow circular pipe 2B, a pre-boring method in which a pile is inserted and installed in a previously drilled or loosened portion of the ground for curing. Etc. are preferably employed. In this case, it is desirable to fill a gap portion between the hollow circular tube 2 and the boring hole with a material having excellent water permeability such as crushed stone.

  As shown in FIG. 5, the water stop structure 15 has a longitudinal groove 2 a formed in advance along the axial direction on the outer surface of the connecting portion adjacent to the horizontal direction of the hollow tube 2 constituting the side wall 3. In the water stop space formed by the vertical grooves 2a and 2a when the hollow circular pipes 2 and 2 are disposed adjacent to each other, water stop is performed by a known means. In the illustrated example, spacers 15a and 15a are arranged in the longitudinal grooves 2a and 2a of the water stop space at predetermined intervals in the axial direction, respectively, and between the spacers 15a and 15a are also continuously stopped in the axial direction. It is set as the water stop structure 15 arrange | positioned so that the water plate 15b may be bridged.

  As the check valves 10 and 12, known check valves such as a swing check valve and a dual plate check valve that allow rainwater to flow only in one direction can be used. Further, as shown in FIG. 6, for example, inside the pipe of the ground penetration hole 13, a partition plate 12a for partitioning the hole at a predetermined height and vertical walls 12b and 12c for partitioning in the rainwater circulation direction A lower tank 12d opened to the outside and an upper tank 12e opened to the outside of the pipe are formed, and an opening 12f communicating the lower tank 12d and the upper tank 12e is formed at the center of the partition plate 12a. It is also possible to provide the check valve 12 that allows only the outflow from the inside of the pipe to the ground by disposing the valve body 12g in the upper part with the valve seat as the valve seat. When the water level in the pipe is higher than the groundwater level outside the pipe, the check valve 12 is configured such that the rainwater flowing into the lower tank 12d pushes up the valve body 12g, as shown in FIG. 6 (A). When the water level in the pipe is lower than the groundwater level outside the pipe, the groundwater is discharged into the upper tank 12e as shown in FIG. Even if it flows into the pipe, the opening 12f is blocked by the valve body 12g, so that it cannot flow into the pipe. In addition, the check valve 10 provided in the rainwater inflow hole 11 can be a check valve 10 that allows only inflow into the pipe by disposing the check valve 10 in a direction opposite to the check valve 12. In addition, it is preferable that these check valves 10 and 12 are cassette-type so that they can be easily exchanged even if clogging or the like occurs by being detachably provided in the rainwater inflow hole 11 and the ground infiltration hole 13, respectively. .

  Also used as the rainwater inflow hollow tubes 2A, 2A ... and the ground penetration hollow tubes 2B, 2B ... of the hollow tube groups 2, 2 ... constituting the side wall 3 and the intermediate pillars 7, 7 ... A part of the hollow circular tube groups 2, 2... Other than the hollow circular tube 2C for water use for effectively using the stored rainwater is used. As shown in FIG. 1, a rainwater inflow hole 16 through which rainwater stored in the rainwater storage space 6 flows into the pipe is formed in the hollow circular pipe for water use 2 </ b> C, as shown in FIG. 1. In addition, a continuous capillary member 17 is provided from the inside of the tube to the ground. The rainwater inflow hole 16 may be an opening that penetrates the pipe wall surface, and the flow between the inside of the pipe and the rainwater storage space 6 is freely performed from both directions.

  The capillary member 17 is composed of a thin tubular member, a fibrous member, or the like that is continuously formed from the inside of the tube to the ground, and is configured so that the liquid can move along the member by the surface tension of the liquid. . As shown in FIG. 1, the capillary member 17 is continuously disposed from the inside of the water-use hollow circular tube 2 </ b> C to the planted ground, thereby supplying rainwater in the tube using the capillary phenomenon of the capillary member 17. By maintaining the pavement material in a wet state, it becomes possible to preserve the ecosystem and improve the heat island phenomenon.

  It is desirable that the rainwater stored in the rainwater storage space 6 can be drained to the river 31 by the water pump 30 so that the rainwater storage amount can be adjusted.

  Next, the flow of rainwater in the rainwater storage structure 1 will be described in detail.

  FIG. 7 is a longitudinal sectional view of the rainwater storage structure 1 schematically showing the flow of rainwater when rainwater flows in from the ground. Rainwater from the ground flows into the rainwater inflow hollow circular pipe 2A after removing impurities, mud, oil, and the like when passing through the filtration device 14 disposed at the rainwater inlet 8. The rainwater outflow hole 9 flows into the rainwater storage space 6. Rainwater stored in the rainwater storage space 6 passes through the check valve 10 provided in the rainwater inflow hole 11 of the ground penetration hollow circular pipe 2B and flows into the ground penetration hollow pipe 2B. Thereafter, as shown in the illustrated example, when the water level in the ground penetration hollow circular pipe 2B rises from the groundwater level, the rainwater flowing into the ground penetration hollow pipe 2B is provided in the ground penetration hole 13 due to the water head difference. It passes through the check valve 12 and is discharged to the ground.

  In the water-use hollow circular pipe 2C, as the water level of the rainwater storage space 6 rises, rainwater flows into the pipe from the rainwater inflow hole 16, and the capillary member 17 is immersed in the rainwater. Then, the rainwater rises up the capillary member 17 by a capillary phenomenon and diffuses to a planting board near the root of the plant, and is used for the conservation of the ecosystem and the improvement of the heat island phenomenon.

  On the other hand, when the inflow of rainwater from the ground stops and the water level of the rainwater storage space 6 becomes lower than the groundwater level in the ground, the discharge from the ground penetration hole 13 stops and the groundwater is not recharged. As a first countermeasure means in such a case, as shown in FIG. 8, pumped-up water for pumping rainwater stored in the rainwater storage space 6 and supplying it into the pipe of the ground penetration hollow circular pipe 2B. A pump 18 is provided. Thereby, even if the water level in the rainwater storage space 6 is lower than the groundwater level in the ground, the water level of the ground circular hollow tube 2B can be forcibly raised, and the ground penetration hole 13 is caused by the water head difference. It passes through the check valve 12 provided and is discharged to the ground.

  As a second countermeasure, as shown in FIG. 9, the rainwater stored in the rainwater storage space 6 is removed from the rainwater inflow hole 11 by making the inside of the ground penetration hollow circular tube a negative pressure. A vacuum pump 19 is provided for flowing through the tube. As shown in FIG. 2A, the vacuum pump 19 is operated to create a negative pressure in the ground penetration hollow pipe 2B, whereby rainwater in the rainwater storage space 6 flows from the rainwater inflow hole 11 to the check valve 10. As shown in FIG. 4B, the water level of the ground penetration hollow circular pipe 2B can be forcibly raised. This makes it possible to drain the rainwater in the pipe through the check valve 12 provided in the ground permeation hole 13 and discharge it to the ground using the head difference with the groundwater level. Moreover, you may make it forcibly discharge the rainwater in the hollow circular pipe 2B for ground penetration by pressurizing the hollow circular pipe 2B for ground penetration.

  Next, the structure for maintenance of the rainwater storage structure 1 will be described in detail.

  First, the rainwater storage structure 1 may be provided with a mud sediment settling function in addition to the removal of impurities, mud, oil, and the like by the filtration device 14. Specifically, the pipe length is secured at a certain depth below the rainwater outflow hole 9 provided in the pipe wall portion of the rainwater inflow hollow circular pipe 2A, and the rainwater is temporarily retained. By temporarily retaining the rainwater in the temporary retention portion, the mud mixed in the rainwater can be settled and removed, and the inflow of the mud into the rainwater storage space 6 can be suppressed. As a result, the check valves 10 and 12 can be prevented from being clogged.

  Further, as shown in FIG. 10, the hollow circular pipe 2 can be provided with a nozzle insertion hole 20 for inserting a water jet nozzle in order to clean the check valves 10 and 12 and to clean the inner wall surface of the pipe. . As shown in FIG. 1A, the nozzle insertion hole 20 is usually provided with a lid 21, and the lid 21 is opened at the time of inspection / cleaning to insert the water jet nozzle 22 (FIG. 2B). ).

  On the other hand, it is preferable that the hollow circular pipe 2 has a structure capable of entering the pipe from the upper end opening for exchanging the check valves 10 and 12 and cleaning the pipe. In this case, a removable lid is installed in the upper end opening.

It is a longitudinal cross-sectional view of the rainwater storage structure 1 which concerns on this invention. FIG. It is a longitudinal cross-sectional view which shows 2A of hollow circular tubes for rainwater inflow. It is a longitudinal cross-sectional view which shows the hollow circular pipe 2B for ground penetration. 2A is an enlarged view of a portion IV in FIG. 2, and FIG. 4B is an enlarged view of a portion B of the water stop structure 15. FIG. It is an expanded sectional view of the ground penetration hole 13 portion showing check valve 12. It is the longitudinal cross-sectional view (the 1) of the rainwater storage structure 1 which shows the flow of rainwater. It is a longitudinal cross-sectional view (the 2) of the rainwater storage structure 1 which shows the flow of rainwater. It is a longitudinal cross-sectional view (the 3) of the rainwater storage structure 1 which shows the flow of rainwater. 3 is a longitudinal sectional view of the hollow circular tube 2 showing a nozzle insertion hole 20. FIG. The conventional rainwater storage structure 50 is shown, (A) is a longitudinal sectional view, and (B) is a plan view. The conventional rainwater storage structure 60 is shown, (A) is a longitudinal sectional view, (B) is a plan view, and (C) is an enlarged view of a C portion.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rainwater storage structure, 2 ... Hollow circular pipe, 2A ... Hollow circular pipe for rainwater inflow, 2B ... Hollow circular pipe for ground penetration, 2C ... Hollow circular pipe for water utilization, 3 ... Side wall, 4 ... Upper floor slab, 5 ... Lower floor slab, 6 ... Rain water storage space, 7 ... Intermediate column, 8 ... Rain water inflow port, 9 ... Rain water outflow hole, 10.12 ... Check valve, 11 ... Rain water inflow hole, 13 ... Ground infiltration hole

Claims (7)

A rainwater storage space is formed by a side wall formed by placing a hollow circular tube adjacent to the ground in the horizontal direction, and an upper floor slab and a lower floor slab, and a hollow circular pipe is formed inside the rainwater storage space. A rainwater storage structure with an intermediate pillar
A part of the hollow circular tube group is formed with a rainwater inflow port for allowing rainwater from the outside to flow into the tube, and a rainwater outflow for flowing rainwater flowing into the tube from the rainwater inflow port into the rainwater storage space. It is a hollow circular tube for rainwater inflow with a hole,
The other part of the hollow circular tube group is driven to extend to the deep layer ground beyond the lower floor slab, and to the pipe wall portion corresponding to the rainwater storage space, into the pipe A rainwater inflow hole for allowing rainwater to flow into the pipe is formed by providing a check valve that allows only inflow, and a check that allows only the outflow to the ground in the pipe wall portion placed in the deep side ground. A rainwater storage structure having a soil infiltration function, characterized in that a ground infiltration hollow circular pipe having a ground infiltration hole for discharging rainwater to the ground by providing a valve is provided.   The rainwater storage structure having a ground infiltration function according to claim 1, wherein a centrifugal high-strength concrete pile (PHC pile) by a pretension method is used as the hollow circular pipe.   Still another part of the hollow circular tube has a rainwater inflow hole for allowing rainwater stored in the rainwater storage space to flow into the tube, and a continuous capillary member is provided from the inside of the tube to the ground. The rainwater storage structure provided with the ground infiltration function according to claim 1, which is a hollow circular pipe.   The rainwater storage structure having a ground infiltration function according to any one of claims 1 to 3, wherein a rainwater filtration device for filtering rainwater flowing into the pipe is provided at the rainwater inlet.   The ground infiltration function according to any one of claims 1 to 4, further comprising a pump for pumping up the rain water stored in the rain water storage space and supplying the rain water into a pipe of the ground circular hollow tube. Rainwater storage structure.   5. A vacuum pump is provided for causing rainwater stored in the rainwater storage space to flow into the pipe through the rainwater inflow hole by setting the inside of the ground penetration hollow circular pipe to a negative pressure. A rainwater storage structure having a ground seepage function according to any one of the above.   The rainwater storage structure having a ground infiltration function according to any one of claims 1 to 6, wherein a nozzle insertion hole for inserting a water jet nozzle is formed in the hollow circular pipe.

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