JP2012057442A - Rainwater storage tank and rainwater storage tank filling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable anisotropy against soil pressure to be reduced and to reduce a manufacturing cost.SOLUTION: A filling block 30 has an approximate shape of a cubic box. The filling block 30 is integrally provided with a cylindrical side plate 32 and a top plate 40 to close a top surface side of the side plate 32 and has an opening section 34 on a box surface opposite to the top plate 40. The opening section 34 is provided with a bottom plate section 34A extending toward a peripheral side along a periphery of the opening section 34. A folded section 34B formed by folding the bottom plate section 34A in a direction opposite to an opening is arranged all the way along the periphery of the bottom plate section 34A. The filling block 30 has a square shape in a planar view where a length in a longitudinal direction A and the length in a lateral direction B are equal.

Description

  The present invention relates to a rainwater storage tank used for storing rainwater or penetrating into the ground, and a rainwater storage tank filling structure constituting the rainwater storage tank.

  In recent years, a large amount of rainwater has been stored underground, and facilities that infiltrate this rainwater into the strata gradually, in order to compensate for the decrease in water retention capacity of the strata especially in urban areas and factory areas. Development of facilities that discharge to rivers over a sufficient amount of time and facilities that pump up stored rainwater and use it as fire prevention water (collectively, these facilities are called “rainwater storage tanks”) are under development. .

  As such a rainwater storage tank, what was described in patent document 1 is known, for example. In Patent Document 1, a plurality of box-shaped filling members are spread on the water-impervious sheet without gaps, and the same filling members are stacked in the height direction to construct a filling structure in the water storage pit. . However, since each filling member of Patent Document 1 has a rectangular shape with different vertical and horizontal lengths, anisotropy tends to occur with respect to earth pressure.

  Moreover, in patent document 1, since it is arrange | positioned so that the filling members adjacent to an up-down direction may straddle a horizontal direction with the filling member arrange | positioned on the lower side and the upper side, the connection part of the horizontal direction of filling members is not. Compared with a case where the entire filling structure is dispersed and the connecting portions are arranged at the same position in the vertical direction, the concentration of moment can be suppressed. However, in order to fill the end portion of the filling structure, it is necessary to use an auxiliary member having a completely different shape from the filling member mainly used, and the manufacturing cost is high.

JP 2008-223418 A

  The present invention has been made in consideration of the above-described facts, and has a rainwater storage tank filling structure in which anisotropy is reduced and manufacturing cost is suppressed, and rainwater storage using the rainwater storage tank filling structure The purpose is to provide a tank.

  In order to solve the above-mentioned problem, the rainwater storage tank filling structure according to claim 1 has a square shape when viewed from above, and closes the other side of the side plate and the cylindrical side plate opened at one end along the height direction. A plurality of box-shaped filling blocks formed integrally with the top plate are arranged so that the filling blocks adjacent in the horizontal direction are in contact with each other, and the filling blocks in the vertical direction adjacent to each other are the top surfaces or the A laminated filling block group in which openings formed on the opening side face each other and are arranged so as to deviate from each other by half width vertically and horizontally, and a half filling block having a shape obtained by dividing the filling block into two in a top view is the laminated filling. An edge-filling block group arranged at the edge of the block group, and a quarter-filling block having a shape obtained by dividing the filling block into four when viewed from above, are provided at the corners of the stacked-filling block group. Comprises a location to corners filler block group, the.

  In the rainwater storage tank filling structure according to claim 1, the laminated filling block group in which the filling blocks are arranged is the main structure, and the end filling block group in which the half filling blocks are arranged on the edge of the laminated filling block group is formed. A corner filling block group in which quarter filling blocks are arranged at the corners of the stacked filling block group is formed.

  Since the filling blocks constituting the laminated filling block group having the main structure are square when viewed from the upper surface, anisotropy with respect to earth pressure can be reduced.

  Further, since the filling blocks are arranged so as to be shifted from each other by half a width in the vertical direction adjacent to each other, the connecting portions of the filling blocks adjacent in the horizontal direction are dispersed in the vertical direction. Therefore, the concentration of moment can be suppressed as compared with the case where the connecting portions are arranged at the same position in the vertical direction.

  Moreover, since the half filling block and the quarter filling block which comprise the rainwater storage tank filling structure of this invention are made into the shape which divided the filling block into 2 parts or 4 parts, they can be manufactured easily.

  The rainwater storage tank filling structure according to claim 2 is characterized in that a connecting portion that connects the filling blocks stacked in the vertical direction is formed on the top surface and the opening.

  In this way, by forming the connecting portion in the filling block and connecting the upper and lower filling blocks, the displacement of the filling block can be suppressed.

  In the rainwater storage tank filling structure according to claim 3, the side plate of the filling block enters the inside of the box at the vertical center and the horizontal center, and is formed with two convex portions arranged vertically and horizontally. It is characterized by that.

  Thus, by forming a convex part with a side plate, many corner | angular parts are comprised in a box-shaped filling block, and the intensity | strength of an up-down direction can be made high.

  The rainwater storage tank according to claim 4 is constructed of a water shielding sheet laid so as to cover an inner surface of a concave pit formed on the ground, and any one of claims 1 to 3 constructed inside the water shielding sheet. Or the rainwater storage tank filling structure according to claim 1.

  According to the rainwater storage tank of claim 4, since the rainwater storage tank filling structure according to any one of claims 1 to 3 is used, anisotropy with respect to horizontal earth pressure can be reduced, Manufacturing costs can also be reduced.

  As described above, according to the rainwater storage tank filling structure of the present invention, the anisotropy with respect to the earth pressure can be reduced and the manufacturing cost can be suppressed.

It is sectional drawing which shows typically the structure of the rainwater storage penetration tank which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the water-blocking protective layer in the rainwater storage tank shown by FIG. (A) which shows the structure of the filling block used for the rainwater storage tank of this invention is the perspective view seen from the top-plate side, (B) is the perspective view seen from the bottom-plate side. (A) which shows the structure of the half filling block used for the rainwater storage tank of this invention is the perspective view seen from the top-plate side, (B) is the perspective view seen from the bottom-plate side. (A) which shows the structure of the quarter filling block used for the rainwater storage tank of this invention is the perspective view seen from the top-plate side, (B) is the perspective view seen from the bottom-plate side. It is a perspective view which shows the structure of the 1st step | paragraph of the rainwater storage tank filling structure used for the rainwater storage tank of this embodiment. It is a perspective view which shows the position of the filling block laminated | stacked on the 2nd step of the rainwater storage tank filling structure used for the rainwater storage tank of this embodiment. It is a perspective view which shows the 1st, 2nd step | paragraph structure (no half and a quarter filling block) of the rainwater storage tank filling structure used for the rainwater storage tank of this embodiment. It is a perspective view which shows the 1st, 2nd step | paragraph structure (without a quarter filling block) of the rainwater storage tank filling structure used for the rainwater storage tank of this embodiment. It is a perspective view which shows the 1st, 2nd step | paragraph structure of the rainwater storage tank filling structure used for the rainwater storage tank of this embodiment. It is a perspective view which shows the structure of the 1st-3rd step | paragraph of the rainwater storage tank filling structure used for the rainwater storage tank of this embodiment. It is the figure which looked at the rainwater storage tank filling structure used for the rainwater storage tank of this embodiment from the horizontal direction. It is the perspective view seen from the baseplate side which shows the structure of the modification of the filling block used for the rainwater storage tank of this invention. It is a perspective view which shows the connection structure of the filling block shown in FIG.

  Hereinafter, a rainwater storage tank and a rainwater storage tank filling structure according to an embodiment of the present invention will be described with reference to the drawings.

  (Configuration of rainwater storage tank)

  FIG. 1 schematically shows a rainwater storage tank according to an embodiment of the present invention. As shown in FIG. 1, the rainwater storage tank 10 is embedded in the underground F and includes an inflow rod 12 and an outflow rod 14 as its incidental facilities.

  When the rainwater storage tank 10 shown in FIG. 1 is installed, first, rainwater is collected and a concave pit P is dug from the ground surface of the site to be stored, and the inner surface of the pit P is protected against water. After covering with the layer 16 without a gap, the rainwater storage tank filling structure 18 having a predetermined volume formed in a substantially rectangular parallelepiped shape is constructed in the pit P covered with the water shielding protective layer 16.

  Next, the top surface side of the rainwater storage tank filling structure 18 is covered with a water shielding sheet 20 without a gap, and the outside of the rainwater storage tank filling structure 18 is sealed with the water shielding protection layer 16 and the water shielding sheet 20, and then the rainwater storage tank The pit P in which the filling structure 18 is disposed is backfilled with soil, and the upper side of the rainwater storage tank filling structure 18 is covered with a cover layer 22. In addition, in the site where the rainwater storage tank 10 is installed in the basement, most of the ground surface is usually covered with a non-immersible pavement material such as concrete or asphalt.

  In the site, an inflow dredging 12 formed in a container shape with reinforced concrete is embedded around the rainwater storage tank 10, and an outflow dredging 14 formed in a container shape with reinforced concrete adjacent to the rainwater storage tank 10. Buried. For example, the inflow rod 12 divides the site into a plurality of regions having a predetermined area, and the inflow rod 12 is installed for each region, and rainwater flows into each of the inflow rods 12. Here, the one or more inflow troughs 12 closest to the rainwater storage tank 10 are connected to other inflow troughs 12 through the water conduits 24. As a result, rainwater that has fallen on the entire site is once collected in the inflow trough 12 that is closest to the rainwater storage tank 10.

  One end portion of the inflow pipe 26 is connected to a portion of the inflow rod 12 near the lower end of the side wall portion, and one end portion of the overflow pipe 28 is connected to the upper side of the connection portion with the inflow pipe 26 in the side wall portion. . The other end side of the inflow pipe 26 passes through the water shielding protective layer 16 and communicates with the inside of the rainwater storage tank 10, and the other end portion of the overflow pipe 28 is connected to a portion near the upper end of the side wall portion of the outflow raft 14. ing.

  One end portion of the orifice pipe 25 is connected to the lower end portion of the side wall portion of the outflow soot 14, and one end portion of the overflow pipe 27 is connected to the upper end portion of the side wall portion. The other ends of the orifice pipe 25 and the overflow pipe 27 are connected to drainage paths such as water pipes connected to rivers, rivers, etc., drainage culverts, and sewers, respectively. Here, the rainwater overflowed from the rainwater storage tank 10 flows into the spillway 14 and is temporarily stored. In addition, the orifice pipe 25 has a function as an orifice for restricting the flow rate of rainwater flowing out from the inside of the outflow basin 14 to the drainage path.

  As shown in FIG. 2, the water shielding protective layer 16 has a three-layer structure including an outer protective mat 16A, a water shielding sheet 20, and an inner protective mat 16B. The outer protective mat 16A and the inner protective mat 16B are made of non-woven fabric having a sufficient flexibility, using polyester short fibers as raw materials. The outer protection mat 16 </ b> A and the inner protection mat 16 </ b> B protect the rainwater storage tank filling structure 18 and the water shielding sheet 20 from loads caused by earth pressure and the weight of the rainwater storage tank filling structure 18 by alleviating stress concentration. .

  The rainwater storage tank filling structure 18 of the rainwater storage tank 10 includes a stacked filling block group 60 in which a plurality of filling blocks 30 shown in FIG. 3 are arranged and stacked as a main structure. Further, a plurality of half filling blocks 50 shown in FIG. 4 are arranged on the outer periphery of the laminated filling block group 60, and a plurality of stacked end filling block groups 62 and a plurality of quarter filling blocks 52 shown in FIG. 5 are arranged and laminated. The corner filling block group 64 is arranged. The details of the stacked filling block group 60, the edge filling block group 62, and the corner filling block group 64 will be described later.

(Structure of filling block)

  As a molding material of the filling block 30, polyolefin resin such as polypropylene (PP) and polyethylene (PE) (particularly high density polyethylene (HDPE)) is preferable in terms of chemical stability, mechanical strength, and price. . Here, the melt flow rate (MFR) (JIS K7210) of the resin is preferably 10 (F / 10 minutes) to 15 (F / 10 minutes) in consideration of workability and mechanical strength. Moreover, you may improve light resistance by adding 1-3% of carbon black as a filler to these. In addition, since an installation place is not a place where it becomes high temperature, it is not necessary to add an antioxidant. Further, FRP based on unsaturated polyester may be used.

  The filling block 30 is formed in a hollow container shape. The thickness of the filling block 30 is set to 2 mm to 3 mm in consideration of the weight per product, mechanical strength, and the like. The filling block 30 can be molded by an injection molding method or a press method.

  As shown in FIGS. 3A and 3B, the filling block 30 is formed in a substantially cubic box shape (hollow container shape) as a whole. A cylindrical side plate 32 is formed on the filling block 30, and a top plate 40 that closes the top surface side of the side plate 32 is integrally formed. The filling block 30 has an opening 34 formed by opening a box surface facing the top plate 40. A bottom plate portion 34A is formed along the outer periphery of the opening portion 34 so as to extend to the outer peripheral side, and a folded portion 34B is formed on the outer periphery of the bottom plate portion 34A. It is formed over. Here, the filling block 30 has a square shape in which the length SA in the vertical direction A is equal to the length SB in the horizontal direction B in a top view.

  When viewed from above, the central portion of the side plate 32 in the vertical direction A and the central portion in the horizontal direction enter the inside of the box, and have a substantially truncated pyramid shape arranged in two in the vertical direction A and two in the horizontal direction B. Convex portions 36 </ b> A to 36 </ b> D (simply referred to as “convex portion 36” when collectively referred to) are formed. The convex portions 36 </ b> A to 36 </ b> D are formed in a tapered shape in which dimensions along the vertical direction and the horizontal direction gradually decrease from the opening side to the top side. Further, the intervals along the vertical direction A and the horizontal direction B of the convex portions 36A to 36D are equal to each other. By forming these convex portions 36, an inner wall surface portion 38 that connects the adjacent convex portions 36 to each other is formed on the side plate 32. Thus, by forming the convex part 36, many corner | angular parts are formed in the side surface of the filling block 30, and the intensity | strength with respect to the load of a perpendicular direction is high.

  In addition, by forming the convex portion 36, the concave portions 38 </ b> A to 38 </ b> D that are respectively recessed toward the inner side of the box between the convex portions 36 </ b> A to 36 </ b> D in the side plate 32. ") Is formed. In the side plate 32, recessed plate portions 35A to 35D for closing the lower ends of the recessed portions 38A to 38D are formed integrally with the bottom plate portion 34A.

  The top plate 40 is formed with a center plate portion 42 at the center, and cover plate portions 44A to 44D (including these) so as to cover the top surfaces of the convex portions 36A to 36D integrally from the center plate portion 42. In this case, it is simply referred to as “lid plate portion 44”). A circular hole 44H is formed at the center of the cover plate portions 44A to 44D. A cylindrical portion 44E that protrudes from the upper surface of the cover plate portions 44A and 44C is formed on the outer periphery of the hole 44H of the cover plate portions 44A and 44C arranged diagonally in the cover plate portion 44. The cylindrical portion 44E has an outer diameter that can be inserted into the hole 44H of the cover plate portions 44B and 44D.

  The bottom plate portion 34A and the recessed plate portions 35A to 35D are formed with an engagement convex portion 33A protruding from the opening-side surface of the bottom plate portion 34A and an engagement hole 33B penetrating the bottom plate portion 34A. The engaging protrusions 33A and the engaging holes 33B are alternately formed at four positions of the end side length S1 in the vertical direction A and the horizontal direction B from the four corners of the bottom plate portion 34A. Moreover, the engaging convex part 33A or the engaging hole 33B is formed in the opposing position which pinched | interposed each convex part 36 of the hollow plate parts 35A-35D. If what is formed on the bottom plate portion 34A is the engaging convex portion 33A, it is the engaging hole 33B that is formed at the opposite position across the convex portion 36, and what is formed on the bottom plate portion 34A. In the case of the engaging hole 33B, the engaging convex portion 33A and the engaging hole 33B are opposed to each other at the opposing position such that the engaging convex portion 33A is formed at the opposing position across the convex portion 36. It is formed to become. The engaging convex portion 33A can be fitted into the engaging hole 33B.

(Structure of half filling block)

  As shown in FIG. 4, the half filling block 50 has a shape divided into two at the center in the horizontal direction B (or vertical direction A) of the filling block 30. Therefore, in the top view, the dimension SH in the horizontal direction B (or vertical direction A) of the half filling block 50 is ½ of the dimension in the horizontal direction B (or vertical direction A) of the filling block 30.

  The half filling block 50 includes convex portions 36A and 36B, and the center plate portion 42 and the bottom plate portion 34 are divided into two (hereinafter, the half-divided center plate portion 42 is referred to as “half center plate 42H”, and the bottom plate portion 34A is referred to as “ The half-bottom plate portion 34H ”, the inner wall surface portion 38 and the recessed plate portion 35A between the convex portion 36A and the convex portion 36D, and the inner wall surface portion 38 and the recessed plate portion 35C between the convex portion 36B and the convex portion 36C are also divided into two. (Hereinafter, the divided inner wall surface 38 is referred to as “half inner wall surface portion 38H”, and the two divided depression plate portions 35B and 35D are referred to as “half depression plate portion 35BH” and “half depression plate portion 35BH”, respectively. ).

(Composition of quarter filling block)

  As shown in FIG. 5, the quarter filling block 52 is divided into two at the center in the longitudinal direction A of the filling block 30 and into four at the center in the lateral direction B. Therefore, in the top view, the dimension SQ in the vertical direction A and the horizontal direction B of the quarter filling block 52 is ½ of the dimension in the vertical direction A and the horizontal direction B of the filling block 30.

  As the quarter filling block 52, two types including the convex portion 36A or the convex portion 36B, that is, the one in which the cylindrical portion 44E is formed on the cover plate portion 44 and the other one are not used. Hereinafter, the one in which the cylindrical portion 44E is formed on the lid plate portion 44 is referred to as a quarter filling block 52A, and the one in which the cylindrical portion 44E is not formed in the lid plate portion 44 is referred to as a quarter filling block 52B. In the quarter filling block 52, the center plate portion 42 and the bottom plate portion 34 are divided into four (hereinafter, the four divided center plate portions 42 are referred to as “quarter center plate 42Q” and the bottom plate portion 34 is referred to as “quarter bottom plate portion 34Q”). The surface portion 38 and the hollow plate portions 35A to 35D are divided into two (hereinafter, the divided inner wall surface portion 38 of the quarter filling block 52 is referred to as a “quarter inner wall surface portion 38Q”, and the two divided hollow plate portions 35A to 35D. Are each referred to as “quarter hollow plate portion 35AQ to 35DQ”).

  (Rain water storage tank filling structure and construction method of rain water storage tank)

  Next, a method for constructing the rainwater storage tank filling structure 18 in the pit P whose inner surface is covered with the water shielding protective layer 16 will be described. First, as shown in FIG. 6, the operator arranges the filling block 30 on the bottom surface of the pit P through the water shielding protective layer 16. At this time, the opening 34 of the filling block 30 faces downward (the side in contact with the water shielding protective layer 16), and the convex portions 36A and 36C of the adjacent filling block 30 are arranged adjacent to the convex portions 36B and 36D. . At this time, the adjacent filling blocks 30 are arranged without a gap so as to contact each other. These filling blocks 30 cover the entire bottom surface of the pit P. Thereby, the 1st step | paragraph of the rainwater storage tank filling structure 18 is comprised.

  Next, as shown in FIG. 7, the worker piles up a plurality of filling blocks 30 as the second stage of the rainwater storage tank filling structure 18 on the first stage filling block 30. An operator arranges the filling block 30 so that the top plate 40 faces downward, and the plurality of filling blocks 30 constituting the first stage are shifted by a half width vertically and horizontally. At this time, it should not be positioned on one row of convex portions 36 arranged on the outermost periphery of the first stage, and the holes 44H formed in the cover plate part 44 of the second stage filling block 30 are The cylindrical portion 44E of the first-stage filling block 30 is inserted, and the cylindrical portion 44E formed on the cover plate portion 44 of the second-stage filling block 30 is inserted into the hole 44H of the first-stage filling block 30. In this manner, the upper and lower filling blocks 30 are engaged. Thereby, one filling block 30 in the second stage is engaged with four adjacent filling blocks 30 arranged in the first stage. The water flow in the vertical direction is performed through the hole 44H.

  As described above, the second-stage filling blocks 30 are also arranged without a gap so that adjacent filling blocks 30 are in contact with each other, as shown in FIG.

  Next, as shown in FIG. 9, the worker places the half filling block 50 on the outermost edge of the first stage filling block 30. At this time, the half dent plate portion 35AH and the half dent plate portion 35CH are arranged on the side of the filling block 30 arranged on the inner side, and the vertical direction or the horizontal direction with respect to the plurality of filling blocks 30 constituting the first stage. They are arranged so as to straddle the two filling blocks 30 with a half-width deviation in the direction. Further, the cylindrical portion 44E of the second half-filling block 50 is inserted into the holes 44H of the cover plate portions 44 of the plurality of filling blocks 30 constituting the first step, and a plurality of pieces constituting the first step. The cylindrical portion 44E of the first filling block 30 is inserted into the hole 44H of the lid plate portion 44 of the second half filling block 50 and engaged with the first filling block 30. Thereby, the half filling block 50 is filled on the convex portions 36 other than the four corners on the outermost periphery of the first-stage filling block 30.

  Next, as shown in FIG. 10, the operator places the quarter filling block 52 on the four corners of the first-stage filling block 30. When the cylindrical portion 44E is arranged on the lid plate portion 44 of the first-stage filling block 30, the quarter plate filling block 52 as the second-stage quarter filling block 52 does not have the cylindrical portion 44E. When the filling blocks 52B are stacked and the cylindrical portion 44E is not disposed on the lid plate portion 44 of the first-stage filling block 30, the second-stage quarter filling block 52 is present. A quarter filling block 52A having a cylindrical portion 44E is laminated on the lid plate portion 44.

  At the time of lamination, the quarter inner wall surface portion 38Q is disposed so as to be disposed on the half filling block 50 side. When the quarter filling block 52A is used, the cylindrical portion 44E is inserted into the hole 44H of the lid plate portion 44 of the first stage filling block 30, and when the quarter filling block 52B is used, the first stage The cylindrical portion 44E of the lid plate portion 44 of the filling block 30 is inserted into the hole 44H and engaged with the first-stage filling block 30. Thereby, the quarter filling block 52 is filled on the four corners of the first-stage filling block 30.

  Next, as shown in FIG. 11, the plurality of filling blocks 30 constituting the third stage are stacked on the second stage filling block 30, the half filling block 50, and the quarter filling block 52. These filling blocks 30 are arranged in the same direction and at the same position as the plurality of filling blocks 30 constituting the first stage. At this time, the engaging projections 33A and the engaging holes 33B formed on the bottom plate portion 34A and the recessed plate portions 35A to 35D of the second-stage filling block 30, the half filling block 50, the quarter filling block 52, The engaging holes 33B and the engaging convex portions 33A formed in the bottom plate portion 34A and the recessed plate portions 35A to 35D of the filling block 30 constituting the third stage are arranged to engage with each other. Thereby, the upper and lower filling blocks 30 are engaged.

  Thereafter, similarly, the filling block 30, the half filling block 50, and the quarter filling block 52 that are stacked in the even-numbered stages are arranged in the same direction and the same position as the second-stage filling block 30, the half filling block 50, and the quarter filling block 52. The filling blocks 30 stacked on the odd-numbered stages are arranged in the same direction and at the same position as the first-stage filling blocks 30. In this way, by stacking the filling block 30, the half filling block 50, and the quarter filling block 52 by the number of stages corresponding to the depth of the pit P (rainwater storage tank 10), a stacked filling block group 60 constituted by the filling blocks 30 is provided. As shown in FIG. 1, the rainwater storage tank filling structure 18 is formed in the pit P by the edge filling block group 62 constituted by the half filling block 50 and the corner filling block group 64 constituted by the quarter filling block 52. Is built.

  After the rainwater storage tank filling structure 18 is constructed in the pit P, the operator covers the upper surface side of the rainwater storage tank filling structure 18 with the water shielding sheet 20 without gaps, and after performing necessary piping work etc., the rainwater The upper side of the storage tank filling structure 18 is backfilled with soil to form the cover layer 22. The ground surface of the site is paved with a paving material such as concrete or asphalt as necessary, or a block or the like is laid.

  (Operation of rainwater storage tank)

  Next, the effect | action of the rainwater storage tank 10 comprised as mentioned above is demonstrated.

  In the site where the rainwater storage tank 10 is installed, when it rains, rainwater once flows into the inflow trough 12 from the ground surface of the site, and the rainwater stored in the inflow trough 12 passes through the inflow pipe 26 in the rainwater storage tank 10. Flow into. At this time, if the water level in the inflow trough 12 becomes higher than the connection part of the overflow pipe 28, the rain water in the inflow trough 12 flows out directly to the outflow trough 14 through the overflow pipe 28 and prevents the rain water from overflowing from the inflow trough 12. ing.

  Rainwater that has flowed into the rainwater storage tank 10 flows out from the rainwater storage tank 10 to the outflow rod 14 through an orifice (not shown) provided between the rainwater storage tank 10 and the outflow rod 14. The orifice restricts the flow rate of water so that the flow rate of rainwater balances with the flow rate of rainwater in the orifice pipe 25 connected to the spillway 14. Moreover, when rainwater exceeding the amount of rainwater outflow from the rainwater storage tank 10 continuously flows into the rainwater storage tank 10 and the rainwater storage tank 10 becomes nearly full, the rainwater in the rainwater storage tank 10 overflows into the outflow basin 14. In addition, overflow of rainwater from the rainwater storage tank 10 is prevented.

  Rainwater that has flowed into the spillway 14 flows out through the orifice pipe 25 to a drainage channel such as a water pipe, drainage culvert, and sewer, and is finally discharged into a river, the sea, or the like. When rainwater exceeding the amount of rainwater flowing through the orifice pipe 25 continuously flows into the outflow basin 14 and the outflow basin 14 becomes nearly full, the rainwater in the outflow basin 14 flows out through the overflow pipe 27 to the drainage path, Rainwater is prevented from overflowing from the inside of the spillway 14.

  According to the rainwater storage tank 10 as described above, by setting the internal volume according to the site area, the rain that has fallen on the site does not flow directly from the ground surface into the river, sewage, etc. After storing the corresponding amount of rainwater in the rainwater storage tank 10, rainwater can be drained from the rainwater storage tank 10 to the river, sewage, etc. Even in the case of heavy rain, it is possible to prevent rainwater exceeding the allowable flow volume from flowing into the river and sewage, and effectively prevent flooding such as flooding and flooding.

  Moreover, in this embodiment, since the hollow filling block 30 is square shape seeing from the upper surface, the anisotropy with respect to the earth pressure of the rainwater storage tank filling structure 18 can be reduced.

  Further, as shown in FIG. 12, the filling blocks 30 are arranged and stacked so as to be shifted by a half width in the vertical and horizontal directions in the adjacent vertical direction. Accordingly, the filling blocks 30 adjacent in the horizontal direction are connected by the upper and lower filling blocks 30, and the filling blocks 30 are arranged so as to mesh with each other, and the connecting portion between the filling blocks 30 adjacent in the horizontal direction is in the vertical direction. Distributed. Thereby, compared with the case where a connection part is arrange | positioned at the same position in the up-down direction, the concentration of the moment or stress by the shear force FH can be suppressed.

  Moreover, in this embodiment, since the half filling block 50 and the quarter filling block 52 which comprise the rainwater storage tank filling structure 18 are made into the shape which divided the filling block 30 into 2 parts or 4 parts, the half filling block 50 and A die for the quarter filling block 52 or the like is not required and can be easily manufactured.

  Moreover, in this embodiment, the rainwater storage tank filling structure 18 is laminated so that the openings 34 of the filling block 30 face each other in the vertical direction, or the lid plate parts 44 of the filling block 30 face each other. . Therefore, the strength against the pressure in the vertical direction can be increased at the boundary between the upper and lower filling blocks 30.

  In the present embodiment, the engaging projection 33A protruding from the opening-side surface of the bottom plate portion 34A and the engaging hole 33B penetrating the bottom plate portion 34A are used so that the bottom plate portion 34 faces up and down. Although the stacked filling blocks 30 are connected to each other, they may be connected by other methods. For example, as shown in FIG. 13, a notch 39 is formed in the middle of each end of the bottom plate portion 34A, and as shown in FIG. 14, a notch 39 adjacent in the horizontal direction is combined to form a connecting hole 39A. The upper and lower filling blocks 30 may be connected by inserting the connecting tool 37 into the connecting hole 39A.

  As shown in FIG. 13, the notch 39 has a tapered portion 39T and a hole 39H. The connecting device 37 has a flange portion 37T having a shape corresponding to the tapered portion 39T when the notch 39 adjacent in the horizontal direction is combined to form the connecting hole 39A, and an insertion portion 37H that can be inserted into the hole portion 39H. is doing. By inserting the insertion part 37H into the hole part 39H of the connection hole 39A and engaging the flange part 37T with the taper part 39T, the connection tool 37 is sandwiched between the filling blocks 30 stacked one above the other. 30 can be connected to each other.

DESCRIPTION OF SYMBOLS 10 Rainwater storage tank 18 Rainwater storage tank filling structure 30 Filling block 34 Bottom plate part 36 Convex part 50 Half filling block 52 Quarter filling block 60 Stacking filling block group 62 Edge filling block group 64 Corner filling block group

Claims (4)

A plurality of box-shaped filling blocks, which are formed in a square shape when viewed from the upper surface, are integrally formed with a cylindrical side plate having an opening at one end along the height direction and a top plate that closes the other end of the side plate. The adjacent filling blocks in the direction are arranged so as to be in contact with each other, and the adjacent filling blocks in the vertical direction face each other such that the top surfaces or the openings formed on the opening side face each other, and are shifted from each other by a half width vertically and horizontally. A group of stacked packing blocks arranged and stacked;
An end-filling block group in which half-filling blocks having a shape obtained by dividing the filling block into two in a top view are arranged on the end sides of the stacked filling block group;
A corner filling block group in which quarter filling blocks having a shape obtained by dividing the filling block into four parts in a top view are arranged at corners of the stacked filling block group;
Rainwater storage tank filling structure with   The rainwater storage tank filling structure according to claim 1, wherein a connecting portion that connects the filling blocks stacked in the vertical direction is formed on the top surface and the opening.   The said side plate of the said filling block enters into a box inner side in the center part of the vertical direction, and the center part of the horizontal direction, The convex part arrange | positioned 2 each in length and width is formed, The 1 or characterized by the above-mentioned. The rainwater storage tank filling structure according to claim 2. A water shielding sheet laid so as to cover the inner surface of the concave pit formed on the ground;
The rainwater storage tank filling structure according to any one of claims 1 to 3, which is constructed inside the water shielding sheet,
Rainwater storage tank with

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