JP6091933B2 - Water tank wall unit - Google Patents

Description

  The present invention relates to a water tank wall unit that is used to construct a wall of a water storage tank by attaching it to the outer periphery of a block assembly structure formed by assembling a water storage space forming block in a horizontal direction and a vertical direction.

  Conventionally, a water storage tank (rainwater storage and penetration facility) has been installed in the basement so that rainwater can be temporarily stored during rainfall. The flooding is controlled by infiltration.

  It is also considered that rainwater stored in the underground water storage tank is used for fire prevention water, watering of flower beds and fields, and the like.

  In recent years, the underground water storage tank as described above is often constructed using a resin water storage space forming block. The water storage space forming block is integrally provided with a horizontal structure portion having a square shape in a planar shape and a predetermined thickness dimension, and one or a plurality of strut portions protruding a predetermined dimension in the vertical direction from the upper surface of the horizontal structure portion. And the said horizontal structure part is set as the structure which provided the through-hole (opening) for allowing water to pass through to an up-down direction.

  When an underground water storage tank is constructed using this type of water storage space forming block, a concave portion having a rectangular planar shape (including a square) is formed by digging the ground.

  Next, inside the concave portion, the water storage space forming blocks are arranged in two horizontal and vertical directions and stacked in multiple stages in the vertical direction and assembled into a rectangular parallelepiped (including cube) shape, and arranged in the vertical direction. A block assembly structure serving as a skeleton having a water storage space is formed between the horizontal structures.

  At this time, when the water storage space forming blocks are arranged in two horizontal and vertical directions and assembled, the outer peripheral end surfaces of the horizontal structure portions are abutted with each other between adjacent water storage space forming blocks, and the abutting portions are formed. They are connected by connecting means (fixing means). Thus, the assembled block assembly structure includes a structure in which horizontal structures of the respective water storage space forming blocks are continuously arranged in a horizontal plane for each certain height position. A horizontal load acting on the structure body from the outer periphery can be received and supported as a compressive load acting on each horizontal structure portion of each water storage space forming block.

  In addition, when the water storage space forming block is arranged in multiple layers in the vertical direction, the lowermost water storage space forming block is arranged in a normal posture with the strut portion facing upward, and the upper and lower sides are inverted upside down. Another water storage space forming block having the posture is arranged, the two supporting column portions opposed to each other in the vertical direction are butted together, and the butted portion is coupled by the coupling means (fixing means). Further, just above, a set of water storage space forming blocks connected in a normal posture and an upside down posture in the same manner as above is arranged in a stacked manner with a predetermined number of stages. Thus, in the assembled block assembly structure, the block assembly structure has a structure in which the strut portions of the water storage space forming blocks that are stacked in the vertical direction are continuously arranged in the vertical direction. On the other hand, a vertical load acting from above can be received and supported as a compressive load acting on the column portion of each water storage space forming block.

  The block assembly structure assembled in the concave portion as described above is provided with a wall member (side wall) on the outer periphery and a top plate attached to the upper surface, and further, a water-impervious sheet around the periphery according to the purpose of rainwater storage and infiltration Then, after covering with a sheet material used by selecting or combining a water-permeable sheet and a protective sheet as appropriate, an underground water storage tank is constructed by backfilling the soil from above.

  By the way, the underground water tank buried underground receives an inward horizontal earth pressure from the surrounding ground. Therefore, the wall member provided on the outer periphery of the block assembly structure receives the horizontal earth pressure on the outer surface side.

  The wall member of this type of underground water tank usually has a flat rectangular parallelepiped shape having a certain thickness dimension in the horizontal direction. Therefore, considering the case where the flat rectangular parallelepiped outer shape member is integrally formed of resin using a two-part mold, generally, the wall member is a member surface that is one side in the thickness direction of the outer shape. On the side, a flat plate portion extending over the entire surface of the member is formed, and a lattice-shaped reinforcing rib is integrally provided on the back surface side of the flat plate portion (for example, Patent Document 1 (paragraph [0025] FIG. 13)).

  Moreover, as another type of the wall member of the underground water storage tank, for example, a water storage space forming block (structural member) is provided at the upper end portion and the lower end portion of the side plate body which is a substantially square plate member. A side plate side engaging portion for engaging with the structure side engaging portion is provided. Further, on the inner surface side of the side plate main body, the thickness dimension of the central portion in the vertical direction is larger than the thickness size of the upper and lower end portions. A structure side plate having a configuration in which the bulging portions are provided at two locations in the width direction (horizontal direction) has been proposed. As a result, the side plate for the structural body is engaged with the structure side engaging portion of the corresponding water storage space forming block of the block assembly structure by engaging the side plate side engaging portions of the upper and lower ends. Can be arranged close to or in contact with the support column of the corresponding water storage space forming block (see, for example, Patent Document 2 (FIGS. 1, 3 to 6)).

JP 2007-77574 A Japanese Patent No. 5027546

  However, in the wall member shown in Patent Document 1, there is a large difference in rigidity between the member surface side where the flat plate portion continuous in the vertical direction exists and the member back surface side without such a continuous flat plate portion. Become. Therefore, the wall member cannot increase the second moment of bending related to the bending deformation due to the horizontal load, and in the state in which the wall of the underground water storage tank is constructed, the horizontal soil from the flat plate portion side which is the outer surface side. When receiving a pressure load, the flat part tends to be bent so that the central part is pushed into the tank. Therefore, the fact is that the wall member has low rigidity against the load of the horizontal earth pressure.

  Therefore, in the wall member disclosed in Patent Document 1, when the depth of the underground water tank is increased, the wall member may not be able to resist the horizontal earth pressure. Therefore, the underground water tank has a relatively shallow depth. Can only be installed in

  In addition, the wall member of the underground water storage tank has not been verified for long-term creep (tertiary creep) in the past, so that the wall member is deformed due to horizontal earth pressure. If the assembly structure of the block assembly structure in the underground water tank collapses, if the foundation of the building is nearby, the building may tilt together. Therefore, conventionally, it is the actual situation that the underground water storage tank has to be installed away from the building so as not to hang on the 45-degree line from the outside of the foundation of the building.

  On the other hand, when the side plate for a structure shown in Patent Document 2 constitutes an underground water storage tank and receives a load of horizontal earth pressure from the side plate main body side which is the outer surface side, the bulging portion is Since the load is transmitted in contact with the support portion of the water storage space forming block arranged inside the tank, the load of the horizontal earth pressure is received and supported by the support portion of the water storage space forming block. become.

  Therefore, the above-mentioned Patent Document 2 does not show any idea of providing the structure side plate itself with strength and rigidity for withstanding horizontal earth pressure and preventing bending deformation that is pushed into the tank.

  In addition, when the structure side plate shown in Patent Document 2 is used, only a dedicated water storage space forming block provided with a strut portion having an outer shape along the bulging portion of the structure side plate can be used. . Therefore, the structure side plate has poor versatility.

  Moreover, the side plate side engaging portions at the upper and lower end portions of the structure side plate shown in Patent Document 2 are merely elastically deformed and fitted into the structure side engaging portions provided in the water storage space forming block. Therefore, the above-mentioned Patent Document 2 does not show or suggest any idea of rigidly connecting the structure side plate to the horizontal structure portion of the water storage space forming block.

  Therefore, the present invention can suppress the occurrence of bending deformation in which the central portion in the vertical direction protrudes toward the inside of the tank even when receiving the load of horizontal earth pressure in the state where the underground water tank is constructed, It is an object of the present invention to provide a water storage wall unit capable of reliably transmitting and receiving a horizontal earth pressure load to a horizontal structure portion of a water storage space block.

In order to solve the above problems, the present invention provides a unit thickness dimension having a unit width dimension and a unit height dimension that is smaller than the unit width dimension and the unit height dimension. A flat rectangular parallelepiped unit outer shape, and a flat plate-like shape extending continuously in the unit height direction arranged at a position along one side surface of the unit thickness direction which is the outer surface of the wall of the underground water storage tank in the unit outer shape an outer flange portion, the walls of the inner surface of the underground water storage tank in the unit external unit thickness direction of the other side unit is arranged at a position along the length of the height direction Wataru Ri continuous flat inner flange portion extending preparative, unit thickness unit along the direction in a plane over the entire length in the height direction and coupled orientation tabular through the web portion, a position along the unit inner surface of the unit profile In the upper and lower ends in the unit height direction, plate portions that are in surface contact with the outer peripheral end surface of the horizontal structure portion of the water storage space forming block for constructing the underground water storage tank are provided over the entire length in the unit width direction. , at a location corresponding to both end portions of the unit height direction of the inner flange portion at both ends of the unit height direction of the unit profile, connecting rigidly connected to rigid connection to the horizontal structure of the water storage space formed block In addition, the water storage tank wall unit has a configuration in which the outer flange portion and the inner flange portion are provided with through holes for allowing water to pass therethrough.

  Further, in accordance with claim 2, in the above configuration, the unit width corresponds to the length dimension of one side of the horizontal structure portion of the water storage space forming block composed of the horizontal structure portion and the column portion used for construction of the underground water storage tank. The unit height is set to a dimension corresponding to the height dimension in a state in which the two water storage space forming blocks are stacked with a pair of struts being brought into contact with each other.

  Further, corresponding to claim 3, in each of the above-described configurations, the rigid connection portion is configured to have a prismatic shape extending in the unit height direction.

  Further, corresponding to claim 4, in each of the above-described configurations, the outer flange portion is divided in the unit width direction, and the divided outer flange portion overlaps the inner flange portion and the unit thickness direction. The outer flange portions and the inner flange portions are alternately arranged in the unit width direction so that the arrangement of the outer flange portions is not between the outer flange portions adjacent to each other in the unit width direction. It is set as the structure provided with the sheet | seat material support member for supporting the arrange | positioned sheet | seat material.

According to the water tank wall unit of the present invention, the following excellent effects are exhibited.
(1) When a load in the horizontal direction is applied from the outside of the outer flange portion, the inner flange portion that is connected and extended over the entire length in the unit height direction extends vertically in the entire region in the unit height direction. By resisting the tensile stress, the water storage tank wall unit of the present invention can obtain a large second moment of section with respect to bending deformation due to the load in the horizontal direction.
(2) Further, the upper and lower end portions of the inner flange portion are rigidly connected to the horizontal structure portion of the unit water storage space forming block by connecting the rigid connection portions provided at both end portions in the unit height direction of the unit outer shape. , since it is provided to span the entire length of unit width direction of the plate portion to be in surface contact with the outer peripheral end surface of the horizontal structure of the water storage space formed blocks, displacement and angle relative to the horizontal structure of the respective water storage space formed block Change is suppressed . Therefore , the resistance to bending deformation of the inner flange portion is further improved.
(3) Thereby, about the underground water tank which formed the wall using the wall unit for water tanks of this invention, the resistance with respect to a horizontal earth pressure can be improved. Therefore, the underground water storage tank can be installed at a position where the depth is greater.
(4) By adopting a configuration corresponding to claim 2, the water storage tank wall unit of the present invention can be easily placed on the side of the water storage space forming block in a state in which the support column portions are butted against each other in pairs. Attach and build an underground water tank easily.
(5) By adopting a configuration corresponding to claim 3, it can be easily rigidly connected to the connecting means having a rectangular tube shape provided on the outer peripheral end surface of the horizontal structure portion of the water storage space forming block. .
(6) By adopting a configuration corresponding to claim 4, the water tank wall unit of the present invention can be easily formed integrally with a resin using a mold that is divided in the unit thickness direction. it can.

The one embodiment of the wall unit for water storage tanks of this invention is shown, (a) is a schematic perspective view of an outer surface side, (b) is a schematic perspective view of an inner surface side. It is a figure which expands and shows the cutting plane of the wall unit for water tanks of FIG. It is a figure which expands and shows the cut side surface in the position of the inner side flange part of the wall unit for water storage tanks of FIG. It is a figure which expands and shows the cut side surface in the position of the outer side flange part of the wall unit for water storage tanks of FIG. It is a schematic plan view which shows the connection part with the water storage space formation block in the wall unit for water storage tanks of FIG. It is a perspective view which shows the outline | summary of the state which constructed | assembled the wall in the outer periphery of the block assembly structure of a water storage space formation block by the water tank wall unit of FIG. It is a cutaway side view showing an outline of an underground water tank constructed using the water tank wall unit of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 (a), (b) to FIG. 7 show an embodiment of a water tank wall unit of the present invention.

  That is, the water storage wall unit of the present invention (hereinafter simply referred to as a wall unit) is constructed of an underground water storage tank I (see FIG. 7), which will be described later, as indicated by reference numeral 1 in FIGS. The unit width (lateral dimension) x having a dimension corresponding to the length dimension of one side of the horizontal structure portion 102 in the water storage space forming block 101 used for the water storage space forming block 101, and the column portions 103 of the water storage space forming block 101 in a pair in the vertical direction. A rectangular parallelepiped flattened in the unit thickness y direction, having a unit height (vertical dimension) z and a unit thickness (depth dimension) y having a dimension corresponding to the height dimension in the state where the two are stacked in contact with each other It has a unit outer shape.

  Here, regarding the outer shape of the wall unit 1, when the wall 107 (see FIG. 7) of the underground water storage tank I is constructed using the wall unit 1, the block assembly structure 111 (FIG. 5-7) is placed on the side facing the unit (inner side of the tank) in the unit thickness y direction (front side in FIG. 1 (b)) on the inner side of the unit and on the opposite side (outer side of the tank) The other surface in the unit thickness y direction (the surface on the near side in FIG. 1A) is referred to as the unit outer surface.

  The basic structure of the wall unit 1 is as follows.

  That is, as shown in FIGS. 1A, 1B, 2 and 4, the wall unit 1 includes a flat plate-like outer flange portion 2 extending in the unit height z direction at a position along the outer surface of the unit. .

  Further, at positions along the inner surface of the unit, flat plate-like inner flange portions 3 extending in the unit height z direction in parallel with the outer flange portion 2 are arranged at two positions spaced apart in the unit width x direction. Has been.

  The inner flange portion 3 has a flat plate shape in which both end edges in the unit width x direction are arranged over the entire length in the unit height z direction in a plane along the unit thickness y direction with respect to the outer flange portion 2. The web unit 4 is integrally connected. As a result, the relative displacement in the unit height z direction is constrained between the outer flange portion 2 and the inner flange portion 3.

  Here, when considering the case where the wall unit 1 is integrally molded with resin using a mold that is divided into two in the unit thickness y direction, the outer flange portion 2 includes the unit thickness with the inner flange portions 3. It is desirable that the member is divided into three parts in the unit width x direction so that there is no overlapping portion in the y direction. In this case, both end edges in the unit width x direction of the inner flange portions 3 are respectively connected to the corresponding edge portions in the unit width x direction of the outer flange portions 2 of the three-part structure via the web portion 4. What is necessary is just to make it connect.

  By providing the above basic structure, the wall unit 1 includes an outer flange portion 2, an inner flange portion 3, and a web portion 4 that extend in the unit height z direction when the entire wall unit 1 is an integrally molded product made of resin. Thus, the longitudinal rigidity can be improved.

  Further, when the wall unit 1 is bent and deformed such that an intermediate portion in the unit height z direction protrudes toward the inner surface of the unit due to a horizontal load acting from the outer surface of the unit, the wall unit 1 is moved vertically to a position along the inner surface of the unit. In the basic structure of the wall unit 1, the inner flange portion 3 provided so as to extend over the entire length in the unit height z direction acts on a position along the inner surface of the unit. It is possible to resist the tensile stress in the up and down direction over the entire region in the unit height z direction. For this reason, the wall unit 1 can obtain a large second moment of section with respect to the bending deformation as described above.

  The wall unit 1 has a pair of rectangular plate-like horizontal portions 6 arranged along both end surfaces in the unit height z direction in the unit outline, and further, the unit width x direction of each horizontal portion 6 The outer frame 5 has a shape formed by connecting the two edge portions with a pair of rectangular plate-shaped vertical portions 7 arranged along the both end surfaces of the unit outer shape in the unit width x direction.

  Each horizontal portion 6 of the outer frame 5 is integrally connected to both end portions in the unit height z direction of the inner flange portions 3. Further, the edge portions of the two outer flange portions 2 of the outer flange portions 2 which are arranged near both ends in the unit width x direction are integrally formed with each vertical portion 7 of the outer frame 5. It is connected.

  Further, as shown in FIGS. 1B and 4, the horizontal structure portion 102 of the water storage space forming block 101 is provided at the upper end portion and the lower end portion in the unit height z direction at positions along the unit inner surface of the unit outer shape. A plate portion 8 is provided which extends over the entire length in the unit width x direction with a height dimension corresponding to the thickness dimension (vertical dimension).

  Each plate portion 8 is integrated with each inner flange portion 3 at a location where both end portions in the unit height z direction of each inner flange portion 3 intersect. Each plate portion 8 has an edge portion on the outer side in the unit height z direction integrally attached to the horizontal portion 6 of the outer frame 5, and both end edges in the unit width x direction have the outer shape described above. It is attached to the vertical part 7 of the frame 5 integrally.

  Furthermore, both end portions in the unit height z direction of the outer flange portion 2 are connected to the edge portions near the center in the unit height z direction of the upper and lower plate portions 8 via inclined flange portions 9, respectively. ing. The inclined flange portion 9 is also connected to the adjacent web portion 4 and the vertical portion 7 of the outer frame 5.

  Thereby, in the state which constructed | assembled the underground water storage tank I (refer FIG. 7) using the said wall unit 1, as shown in FIG. 4, each plate part 8 of the said wall unit 1 is the water storage arrange | positioned inside a tank. The space forming block 101 can be brought into surface contact with the outer peripheral end surface of the horizontal structure portion 102. Accordingly, in this state, when the wall unit 1 receives a load of horizontal earth pressure acting from the outside of the outer surface of the unit, the load is applied from the outer flange portions 2 to the inclined flange portions 9, the web portions 4, and the outer shape. After being efficiently transmitted to the plate portions 8 via the vertical portions 7 of the frame 5, the plate portions 8 make surface contact with the outer peripheral end surface of the horizontal structure portion 102 of the water storage space forming block 101. The average is transmitted to the entire outer peripheral end face.

  A groove having a certain size indentation in the unit height z direction is provided at a position where both end portions in the unit height z direction of the inner flange portions 3 of the horizontal portions 6 at the upper and lower portions of the outer frame 5 are connected. The concave portions 10 are respectively provided over the entire length in the unit thickness y direction. In addition, at a position near the inner surface of the unit inside each of the groove-shaped recesses 10, for example, a prismatic rigid connecting portion 11 that protrudes to a position slightly lower than the surface of the horizontal portion 6 in the unit height z direction. Is provided.

  Here, the structure of the water storage space forming block 101 that is used together with the wall unit 1 to construct the underground water storage tank I will be described.

  As shown in FIGS. 3 to 7, the water storage space forming block 101 has a horizontal structure portion 102 having a square planar shape and a certain thickness, and a predetermined dimension projecting vertically from the upper surface of the horizontal structure portion 102. For example, the four struts 103 are integrally provided, and the horizontal structure 102 is provided with a through hole (opening) (not shown) for allowing water to pass in the vertical direction.

  Further, on each of the four outer peripheral end faces of the horizontal structure portion 102, each groove-like recess 10 provided in each horizontal portion 6 of the wall unit 1 is located on the side opposite to the side from which the column portion 103 protrudes. And a fitting protrusion 104 that protrudes outward with a width dimension that can be inserted into each groove-like recess 10. In addition, each of the fitting protrusions 104 is provided with a fitting hole 105 for inserting the rigid coupling portion 11 of the wall unit 1 on the same side as the side from which the column portion 103 protrudes. Each fitting projection 104 has a rectangular tube shape with one side closed. Each of the fitting protrusions 104 may be in the shape of a rectangular tube provided through the fitting hole 105. In this case, the wall unit 1 is provided on the inner side of each groove-like recess 10. You may make it provide the rigid connection part 11 provided in the height dimension which protrudes to the position which becomes flush | level with the surface of the horizontal part 6. FIG.

  In addition, when the water storage space forming block 101 is assembled by arranging the blocks 101 in two vertical and horizontal directions in the horizontal direction, as shown in FIGS. It is necessary to arrange the outer peripheral end faces of the horizontal structure portion 102 to face each other. Therefore, in the water storage space forming block 101, as shown in FIG. 5, the fitting protrusion 104 and the fitting projection 104 are arranged at the same distance from the middle position in the longitudinal direction of each side on the four sides of the horizontal structure portion 102. It is necessary to provide the recesses 106 for receiving the fitting protrusions 104 in pairs. Accordingly, the fitting protrusions 104 provided on each side of the horizontal structure portion 102 of the water storage space forming block 101 are positioned at rotational symmetry positions of 90 degrees in a horizontal plane with the center of the horizontal structure portion 102 as the center of symmetry. Need to be placed.

  Therefore, in the water storage space forming block 101, the positions of the fitting protrusions 104 provided on the outer peripheral end surfaces of the horizontal structure portions 102 in the normal posture and the vertically reversed posture are in the vertical direction. Are not aligned with each other, but are shifted in the horizontal direction.

  In view of this point, in the wall unit 1, the arrangement of the groove-like recess 10 and the rigid coupling portion 11 provided in the longitudinal direction of the upper horizontal portion 6, the groove-like recess 10 provided in the longitudinal direction of the lower horizontal portion 6, and The arrangement of the rigid coupling portions 11 is set so as to be arranged at a 180-degree rotationally symmetrical position with the center of the unit outer shape as the center of symmetry in a plane parallel to the unit outer surface and the unit inner surface of the wall unit 1. .

  Thereby, as shown in FIG. 3, when the wall unit 1 is disposed by stacking the column portions 103 in a normal posture and a posture in which the water storage space forming block 101 is turned upside down in the normal posture, It arrange | positions to the side of the water storage space formation block 101 of 1 set. Next, the wall unit 1 corresponds to the rigid connecting portion 11 inside each groove-like recess 10 provided in the upper and lower horizontal portions 6 of the horizontal structure portion 102 of each of the upper and lower water storage space forming blocks 101. The fitting hole 105 of the fitting projection 104 provided on the outer peripheral end face is fitted from both the upper and lower sides. Thereafter, in this state, by connecting the upper and lower water storage space forming blocks 101 to each other, the wall unit 1 is attached to the side surface of the pair of water storage space forming blocks 101 in the upper and lower sides. .

  At this time, in the wall unit 1, the horizontal structure portion of the water storage space forming block 101 is arranged around each of the rigid columnar connecting portions 11 inside the groove-like recesses 10 provided in the upper and lower horizontal portions 6. By individually fitting the rectangular tube-shaped fitting projections 104 provided on 102, the horizontal displacement, inclination, and rotation of each of the rigid coupling portions 11 are restricted. Thus, the wall unit 1 has both end portions (upper and lower end portions) in the unit height z direction with respect to each horizontal structure portion 102 of the water storage space forming block 101 in which the two are stacked and connected in pairs. It is designed to be rigidly connected.

  At this time, in the wall unit 1, the rigid connection portions 11 that are involved in the rigid connection with the water storage space forming blocks 101 are provided at both ends of the inner flange portion 3 in the unit height z direction. Therefore, the upper and lower end portions of the inner flange portion 3 are restrained from shifting or changing the angle of the water storage space forming block 101 with respect to the horizontal structure portion 102. Thereby, in the wall unit 1 attached to each said water storage space formation block 101, the resistance with respect to the bending deformation by the horizontal load which acts from the unit outer surface side of the said inner flange part 3 as mentioned above further improves. Therefore, the wall unit 1 does not deform so as to bend toward the water storage space forming block 101 even when receiving a load of horizontal earth pressure, and reliably applies the load to the horizontal structure portion 102 of each water storage space forming block 101. Can be communicated to.

  Each outer flange portion 2, each inner flange portion 3, and each plate portion 8 of the wall unit 1 is provided with a plurality of through holes 12, and the unit inner surface side and the unit outer surface side through the respective through holes 12. The water can be passed between them.

  In addition, the shape, opening area, and arrangement | positioning of each through-hole 12 in the said outer side flange part 2 shall be defined as follows.

  That is, as shown in FIG. 7, the wall 107 of the underground water storage tank I is in a healthy state when the horizontal earth pressure acts on the sheet material 108 arranged around the wall 107 from the outside. That is, a function of supporting from the inside in a state where damage due to excessive bending does not occur is required.

  Therefore, in the wall unit 1, the sheet material 108 (see FIG. 7) used in the underground water storage tank I is subjected to a load similar to the horizontal earth pressure acting on the underground water storage tank I on the unit outer surface side of the wall unit 1. Even if pressed in a state, the sheet material 108 is supported by the peripheral edge of each through hole 12 in the outer flange portion 2, and the sheet material 108 is excessively bent and enters the inside of each through hole 12 to cause damage. The shape, opening area, and arrangement of each through-hole 12 are set so that there is no risk of occurrence.

  By the way, in the said wall unit 1, area | regions other than the location where each outer side flange part 2 is arrange | positioned inside the said outer shape frame 5 in the unit outer surface become the clearance gaps by which the unit outer surface side was open | released.

  Therefore, in the gap, the shape set from the viewpoint of supporting the sheet material 108 (see FIG. 7) in a sound manner, similarly to the shape of the through-hole 12 and the setting method of the opening area in the outer flange portion 2 described above. As a sheet material support member for partitioning (dividing) into a plurality of openings 13 having an opening area, for example, horizontal ribs 14 that connect the adjacent web portions 4 to the inner flange portion 3, and the upper and lower sides of the outer frame 5 Vertical ribs 15 that connect the horizontal portions 6 to each other and the inner flange portion 3, and vertical ribs 16 that connect the upper and lower horizontal portions 6, the inclined flange portions 9, and the inner flange portion 3 of the outer frame 5. Is provided.

  The horizontal ribs 14 and the vertical ribs 15 and 16 are configured such that the end surface on the unit outer surface side is flush with the surface of the outer flange portion 2.

  In addition, the through-hole 12 provided in the said inner side flange part 3 shall have shifted | deviated arrangement | positioning with each said horizontal rib 14 and each vertical rib 15. As shown in FIG. Similarly, it is assumed that the through holes 12 provided in the plate portions 8 are displaced from the vertical ribs 16.

  As described above, in the wall unit 1, the sheet material 108 disposed on the outer surface side of the unit by the outer flange portion 2 provided with the through holes 12 and the end surfaces of the horizontal ribs 14 and the vertical ribs 15, 16. It can be supported in a healthy state.

  Further, as shown in FIG. 1B, between the inner flange portions 3 facing the unit inner surface side of the wall unit 1 and between the inner flange portions 3 and the vertical portion 7 of the outer frame 5. The gap may be provided with a horizontal rib 17 and a vertical rib 18 as shown by a two-dot chain line in FIG.

  The wall unit 1 having the above configuration is generally made of a resin such as polypropylene that does not corrode in water or in the presence of moisture.

Further, the properties of the resin are preferably such that the maximum tensile stress (maximum tensile strength) is 7 N / mm ² or less, and more preferably 6.81 N / mm ² . If the maximum tensile stress of the resin constituting the wall unit 1 is 7 N / mm ² or less, 50 years later determined from the results of the third creep test conducted by the present inventors and the FEM analysis. This is because it has been confirmed that the estimated retention strengths of both satisfy the stability of long-term creep equivalent to 50 years of the underground water tank I.

  Further, when the resin having the above properties is used, the unit thickness y (dimension from the unit outer surface to the unit inner surface) is desirably at least 50 mm or more, and more preferably 70 mm or more. This is because when the unit thickness y is less than 50 mm, even if the inner flange portion 3 resists the tensile stress in the vertical direction over the entire region in the unit height z direction as described above, This is because the distance from the inner flange portion 3 to the inner flange portion 3 becomes small, and the resistance to bending deformation in the entire wall unit 1 becomes small.

  Furthermore, the wall unit 1 preferably has a porosity {(1−actual volume / volume) × 100} value of 80% or more, and more preferably 88% or more. This is because the porosity of the wall unit 1 directly affects the porosity of the entire underground water storage tank I constructed using the wall unit 1. Is less than 80%, it is not preferable from the viewpoint that the storage efficiency of the water in the entire underground water storage tank I is lowered.

  When the underground water storage tank I is constructed using the wall unit 1 of the present invention having the above-described configuration, as shown in FIG. 7, first, the ground 109 is dug down to form the recess 110 as in the prior art.

  Next, on the foundation 110a provided inside the recess 110, the water storage space forming blocks 101 are arranged in two horizontal and vertical directions and stacked in multiple stages in the vertical direction to include a rectangular parallelepiped (including a cube). The block assembly structure 111 is formed by assembling into a shape. At this time, out of the outer peripheral end surfaces of the water storage space forming block 101 located at the outermost periphery in each step of the rectangular parallelepiped shape, out of a set of two water storage space forming blocks 101 that are stacked vertically by butting the struts 103. Further, the wall units 1 are respectively attached in the above-described procedure, and the wall 107 surrounding the outer peripheral surface of the block assembly structure 111 is constructed.

  The block assembly structure 111 assembled in the recess 110 as described above has a top plate 112 attached to the upper surface, and further, a water-impervious sheet, a water-permeable sheet, and a protective sheet are provided around the periphery according to the purpose of storing and infiltrating rainwater. After covering with the sheet material 108 selected or combined as appropriate, the underground water storage tank I is constructed by refilling the soil from above.

  In this state, the underground water storage tank I receives inward horizontal earth pressure from the surrounding ground, but as described above, the wall unit 1 of the present invention has a horizontal load from the outer surface side of the unit. Resistance to the wall member for conventional underground water storage tanks is increased, so even if the horizontal earth pressure is applied, the deformation of the middle part in the vertical direction being pushed into the tank inside is suppressed. be able to.

  Therefore, the underground water storage tank I can be installed at a position where the depth is greater than before.

  Furthermore, when the stability against long-term creep as described above for the wall unit 1 can be ensured, the structure of the underground water storage tank I can be maintained for a long time, so that the water storage tank I is constructed as shown in FIG. It can also be installed at a position where a 45-degree line is applied from the outside of the foundation 114 of the object 113. Therefore, since the underground water storage tank I can be installed at a location close to the building 113 as compared with the conventional one, it is expected that the installation space for the underground water storage tank I can be easily secured. it can.

  Furthermore, according to the wall unit 1 of the present invention, the following effects can be obtained.

  The wall unit 1 can be easily attached to the outer periphery of the block assembly structure 111 constructed by assembling the water storage space forming block 101, and the wall 107 (see FIG. 7) of the underground water storage tank I can be easily constructed. Can do.

  Moreover, the said wall unit 1 can be manufactured as an integral molding of resin.

  Further, since the wall unit 1 is excellent in vertical rigidity, the wall 107 of the underground water tank I (see FIG. 7) constructed by the wall unit 1 is placed from above the underground water tank I. The acting vertical load can be satisfactorily supported.

  Since the rigid coupling part 11 for use in rigid coupling with the water storage space forming block 101 in the wall unit 1 is provided inside the groove-shaped recess 10, the rigid coupling part 11 is provided in the unit outer shape. It will not protrude beyond. Therefore, it is possible to prevent the rigid connection portion 11 from being damaged by excessive force applied to the wall unit 1 before use during storage or transport. Furthermore, since the wall unit 1 can be handled by being stacked in the unit thickness y direction during storage and transport before use, the wall unit 1 can be handled easily.

  Since the rigid connecting portion 11 of the wall unit 1 is formed in a prismatic shape extending in the unit height direction, connecting means provided on the outer peripheral end surface of the horizontal structure portion 102 of the water storage space forming block 101, By adopting a rectangular tube shape having a fitting hole 105 corresponding to the planar shape of the rigid coupling part 11, the wall unit 1 can be horizontally connected to the water storage space forming block 101 via the rigid coupling part 11. The structure portion 102 can be easily rigidly connected.

  In addition, this invention is not limited only to the said embodiment, The load of the horizontal earth pressure which acts on the wall 107 of the underground water tank I (refer FIG. 7) is carried out from the wall unit 1 of this invention to the inside. From the viewpoint of being able to transmit to the outer peripheral end surface of the horizontal structure portion 102 of the water storage space forming block 101 disposed on the both ends in the unit height z direction on the unit inner surface side of the wall unit 1 It is desirable to provide the plate portion 8 that is continuous in the unit width x direction, but the inner surface of the inner flange portion 3 and the unit inner surface side of the horizontal portion 6 and the vertical portion 7 of the outer frame 5. The plate portion 8 is omitted if the horizontal load can be transmitted to the horizontal structure portion 102 of the water storage space forming block 101 from the exposed end surface. It may be. In this case, the wall unit 1 may have a structure in which the upper and lower end portions of the outer flange portion 2 and the inner flange portion 3 are directly connected to the upper and lower horizontal portions 6 of the outer frame 5.

  The vertical portion 7 of the outer frame 5 is preferably provided, but may be omitted.

  The outer flange portion 2 and the inner flange portion 3 may change the dimensions in the unit width x direction, or may change the arrangement order and the number of arrangement in the unit width x direction.

  The lateral ribs 14 provided to form the openings 13 having a predetermined shape and opening area on the outer surface of the unit are the sheet materials used when the underground water storage tank I is constructed according to the number, interval, and position provided in the unit height z direction. 108 (see FIG. 7) may be changed as appropriate according to the flexibility and strength of bending. Similarly, the number, interval, and arrangement of the vertical ribs 15 and 16 in the unit width x direction may be changed as appropriate according to the flexibility and strength of the sheet material 108 (see FIG. 7).

  The sheet material support member is desirably the horizontal rib 14 or the vertical ribs 15 and 16 from the viewpoint of also serving as reinforcement of the entire wall unit 1 and from the viewpoint of integral molding with resin, but the opening 13 As long as the sheet material 108 disposed outside the unit outer surface can be soundly supported while forming the shape, the shape and arrangement of the sheet material support member may be appropriately changed.

  The rigid connection portion 11 of the wall unit 1 is illustrated as a quadrangular prism shape, but may be a prismatic shape whose plane is a polygon other than a square shape, and further, the horizontal structure portion 102 of the corresponding water storage space forming block 101. As long as the connection means provided on the outer peripheral end surface of the stub is fitted to form a rigidly connected state, it may have an arbitrary shape. Correspondingly, in the water storage space forming block 101, the means for connection provided on the outer peripheral end face of the horizontal structure portion 102 is of a type other than that shown in the figure depending on the shape of the rigid connection portion 11 of the wall unit 1. Of course, it may be good.

  The water storage space forming block 101 used for the construction of the underground water storage tank I together with the wall unit 1 of the present invention is connected to the outer peripheral end surface of the horizontal structure portion 102 to be rigidly connected to the rigid connection portion of the wall unit 1. As long as a means is provided, the support | pillar part 103 may use a single thing or multiple things other than four.

  Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS I Underground water tank 1 Wall unit 2 Outer flange part 3 Inner flange part 4 Web part 11 Connection part for rigid connection 12 Through-hole 14 Horizontal rib (sheet material support member)
15 Vertical rib (sheet material support member)
16 Vertical rib (sheet material support member)
DESCRIPTION OF SYMBOLS 101 Water storage space formation block 102 Horizontal structure part 103 Support | pillar part 107 Wall 108 Sheet material x Unit width y Unit thickness z Unit height

Claims (4)

A flat rectangular parallelepiped unit outline having a unit width dimension and a unit height dimension and having a unit thickness dimension smaller than the unit width dimension and the unit height dimension;
A flat outer flange portion continuously extending in the unit height direction disposed at a position along one side surface of the unit thickness direction that is an outer surface of the wall of the underground water storage tank in the unit outline, and an underground water storage tank in the unit outline other aspects unit is arranged at a position along the entire length in the height direction and a plate-shaped inner flange Ri extending continuously Wataru, in a plane along the unit thickness direction of the inner surface of the wall become unit thickness direction Connected via a flat web portion arranged over the entire length in the unit height direction ,
A plate portion that is brought into surface contact with the outer peripheral end surface of the horizontal structure portion of the water storage space forming block for constructing the underground water storage tank at the upper end portion and the lower end portion in the unit height direction at positions along the unit inner surface of the unit outer shape provided with such over the entire width, in positions corresponding to both end portions of the unit height direction of the inner flange portion at both ends of the unit height direction of the unit profile, the horizontal structure of the water storage space formed block It is provided with a rigid connection part for rigid connection,
Furthermore, it has the structure which provided the through-hole for allowing water to pass through in the said outer side flange part and inner side flange part, The wall unit for water storage tanks characterized by the above-mentioned.   The unit width is a dimension corresponding to the length of one side of the horizontal structure part of the water storage space forming block composed of the horizontal structure part and the column part used for construction of the underground water storage tank, and the unit height is the above-mentioned water storage space formation. The wall unit for a water storage tank according to claim 1, which has a dimension corresponding to a height dimension in a state in which a pair of blocks are stacked in abutment with each other.   The water storage tank wall unit according to claim 1 or 2, wherein the connecting portion for rigid connection has a prismatic shape extending in a unit height direction.   The outer flange portion is divided in the unit width direction, and the outer flange portion and the inner flange portion are united so that the divided outer flange portion does not overlap the inner flange portion in the unit thickness direction. A sheet material support member for supporting a sheet material arranged outside the outer flange portion is provided between the outer flange portions adjacent to each other in the unit width direction. The wall unit for a water storage tank according to any one of claims 1 to 3.

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