JP2009235784A - Underground water storage facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground water storage facility which is of a simple structure and yet is capable of surely regulating floating of a plurality of resin compacts. <P>SOLUTION: The underground water storage facility includes an underground water tank in which a plurality of stacked resin compacts are disposed underground and are covered with an impervious sheet covering at least the outer periphery of the resin molding to form water storage spaces between the resin molding. The underground water tank is covered up on its top. The underground water storage facility includes a base bearing the resin molding placed thereon, an extended element which is disposed to extend upward from the base and to be able to transmit an upward force to the base, and a floating regulator which is disposed to be opposite on the upside to at least part of the uppermost resin molding and to be able to transmit an upward force to the extended element. The base is configured to be capable of resisting buoyancy acting on the resin molding. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an underground water storage facility for storing rainwater, and particularly to an underground water storage facility for storing rainwater in an underground water storage tank formed in the ground, a ground such as a park, a road, or a parking lot.

  Conventionally, as a water storage facility for storing rainwater, a plurality of stacked resin molded bodies are disposed in the ground, and at least the outer periphery of the plurality of stacked resin molded bodies is covered with a water shielding sheet. An underground water storage facility with a water storage tank is known.

  Each of the plurality of resin molded bodies has a plurality of convex portions formed on any one surface, and overlaps one surface of the lower resin molded body and the other surface of the upper resin molded body. By stacking in such a manner, there is an interval between the resin molded bodies that are vertically stacked. As a result, the plurality of resin molded bodies are stacked one above the other, and the periphery (outer periphery) is covered with the water shielding sheet, so that a water storage space for storing rainwater is formed between the resin molded bodies overlapping in the vertical direction. It has become.

  The underground water storage system having the above configuration is covered with the underground water storage tank. In other words, this type of underground water storage facility can be directly covered with soil, or a floor board (for example, a concrete floor board) can be placed on the underground water tank, and then the floor board can be covered with soil. It is provided so that its existence cannot be seen from the ground.

  Accordingly, the underground water storage facility having the above-described configuration is provided in a site such as a ground, a park, a road, a parking lot, and the like so that water can be stored without any configuration existing on the ground.

  By the way, the underground water tank having the above-described structure has a problem that it floats when groundwater springs out around it. That is, since the underground water storage tank having the above-described structure has a water storage space that is isolated from the ground side by a water shielding sheet between the resin molded bodies, the surrounding water is stored in a state where gas (air) exists in the water storage space. When the groundwater level rises, there is a problem in that buoyancy is generated in the plurality of resin molded bodies that define the water storage space, and the plurality of resin molded bodies float up to lift the soil, floorboard, and the like thereon.

  In solving such problems, a plurality of resin molded bodies are floated by placing a heavy object set on a weight capable of resisting the buoyancy acting on the plurality of resin molded bodies on the uppermost resin molded body. Although it is conceivable to prevent this, if this is done, the interval between the stacked resin molded bodies may be narrowed or each resin molded body may be crushed, and in a state where an appropriate water storage space is formed. There is a problem that it cannot be maintained.

  In addition, an underground water storage facility is provided in which surrounding groundwater is guided into an underground water storage tank (see, for example, Patent Document 1). In such an underground water storage facility, an opening penetrating the inside and the outside is formed in a water shielding sheet that defines the bottom of the underground water storage tank, and a cylindrical portion formed of the water shielding sheet is connected to a peripheral portion of the opening. Yes. And in underground water storage facilities, the column body standing up by driving the lower end side into the ground (bottom of the excavated recess) is inserted into the opening of the water shielding sheet and the cylindrical portion, and the upper end of the column body is resin molded It is fixed to the deterrent body that faces the body on the upper side.

As a result, such an underground water storage facility increases the amount of stored water by allowing the groundwater to flow from the opening formed in the water-impervious sheet when the amount of water stored in the underground water tank is lower than the level of the surrounding groundwater. In addition, it is said that the deterrent body prevents the resin molded body from floating when the underground water storage tank is filled with water.
JP 2001-107403 A

  However, since the underground water storage facility described in the above publication is configured to allow groundwater to flow from the opening as described above, it is difficult to generate buoyancy due to an increase in the level of the surrounding groundwater. Since the cylindrical portion (water-impervious sheet) expands and contracts up and down, the cylindrical portion is likely to be deteriorated along with the expansion and contraction, and the cylindrical portion may be cracked or opened. Therefore, in the underground water storage facility described in the above publication, there is a problem that water to be stored flows into the ground from cracks or holes formed in the cylindrical portion, and reliable water storage cannot be performed.

  In addition, it is said that the floating of the resin molded body can be suppressed when the underground water tank is filled with water, but because the column body to which the deterrent body is fixed is driven into the soft ground containing groundwater around it, When buoyancy is generated in the resin molded body, the column body comes off and there is a possibility that levitation of the resin molded body cannot be reliably prevented.

  Then, an object of this invention is to provide the underground water storage equipment which can control the levitation | floating of a some resin molded object reliably with a simple structure in view of such a situation.

  In the underground water storage facility according to the present invention, a plurality of stacked resin molded bodies are disposed in the ground, and at least the outer periphery of the plurality of stacked resin molded bodies is covered with a water-impervious sheet, In the underground water storage facility in which the water storage space is formed in the underground water storage facility where the upper surface of the underground water storage tank is covered, a base on which a plurality of resin molded bodies are placed, and extends upward from the base, An extension body provided on the base body so as to be able to transmit at least an upward force, and disposed so as to face at least a part of the uppermost resin molded body on the upper side, and at least above the extension body And a levitation restricting body provided so as to be able to transmit a force to the side, wherein the base body is configured to be capable of resisting buoyancy acting on a plurality of resin molded bodies.

  According to the underground water storage system having the above configuration, when a plurality of resin moldings are to float due to an increase in the level of surrounding groundwater or the level of stored water, the uppermost resin molding pushes the levitation regulator upward. Try to. Then, the pushing-up force (upward force) is transmitted to the base body through the extending body. In this state, an upward force, that is, a force to lift the base acts on the base, but the base opposes the upward force. The levitation of the resin molding will be regulated. Thereby, it can prevent that the some resin molding raises the soil etc. which cover the underground water tank.

  And as mentioned above, since the levitation regulating body reliably regulates the levitation of the resin molded body, it is not necessary to apply a large load on the resin molded body to regulate the levitation. Thereby, a water storage space can be reliably ensured without narrowing the interval between the stacked resin molded bodies or crushing the resin molded bodies.

  As one aspect of the present invention, a floor board covering the underground water storage tank may be further provided, and the floor board may be provided as a levitation regulating body so as to be able to transmit at least an upward force to the extension body. If it does in this way, levitation of a plurality of resin fabrication objects can be controlled by a floor board (floating regulation body), without providing a floatation regulation body and a floor board separately.

  As another aspect of the present invention, the extended body may be inserted through a plurality of resin molded bodies. In this way, since the resin molded body exists around the extended body, the levitation regulating body provided to the extended body so that the upward force can be transmitted is surely opposed to the uppermost resin molded body. Can be made. Thereby, the resin molding to be levitated can be reliably regulated by the levitation regulator.

  As another aspect of the present invention, the extension body may be provided with a retaining body that is inserted into the base at the lower end side and locked to the base. In this way, even if the resin molded body tries to push up the levitation regulating body, the extended body is not pulled out from the base body, and the base body can be reliably opposed to the buoyancy of the resin molded body.

  As yet another aspect of the present invention, the substrate may be set to a weight that can resist buoyancy acting on a plurality of resin moldings. If it does in this way, even if it does not fix a base | substrate to a ground using a pile, a foundation bolt, etc., it can oppose with respect to the buoyancy which acts on a resin molding.

  As described above, according to the underground water storage facility according to the present invention, it is possible to achieve an excellent effect that the levitation of the plurality of resin molded bodies can be reliably regulated with a simple configuration.

  Hereinafter, an underground water storage facility according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  The underground water storage facility according to the present embodiment is provided in the ground such as a ground, a park, a road, etc., and as shown in FIGS. 1 and 2, at least the outer periphery of the plurality of stacked resin molded bodies 100 is shielded. An underground water storage tank 10 covered with a water sheet S1 and having a water storage space A formed between the resin moldings 100 and a floor board 20 covering the underground water storage tank 10 are provided. Covered (covered).

  The underground water storage facility 1 according to the present embodiment has a base 30 on which the plurality of resin molded bodies 100 are placed as a means for restricting the floating of the plurality of resin molded bodies 100. And an extended body 40 provided so as to be able to transmit at least an upward force to the base body 30 and disposed so as to face at least a part of the uppermost resin molded body 100 on the upper side, The extension body 40 is provided with a levitation regulating body 50 provided so as to be able to transmit at least an upward force.

  In the underground water storage tank 10 according to this embodiment, a base body 30 is installed in a recess (not shown) formed by excavation, and a plurality of resin molded bodies 100 are stacked on the base body 30. The resin molded body 100 is formed by wrapping the resin molded body 100 with a water shielding sheet S1 and then backfilling the surroundings with soil. That is, in the underground water storage tank 10 according to the present embodiment, the base body 30 is set on the water shielding sheet S1 laid on the bottom surface of the excavated recess, and a plurality of resin molded bodies 100 are stacked on the base body 30. After that, the periphery of the base body 30 and the plurality of resin molded bodies 100 is wrapped with the water shielding sheet S1, and the soil is backfilled around the water shielding sheet S1 (around the base body 30 and the plurality of resin molded bodies 100). It is formed with.

  Therefore, in the underground water storage tank 10 according to the present embodiment, the lower surface of the base body 30, the periphery (outer periphery) of the base body 30, and the periphery (outer periphery) of the stacked body 15 in which the plurality of resin molded bodies 100 are stacked, It is in a state surrounded by the water shielding sheet S1. Such a water-impervious sheet S1 is composed of a sheet having no water permeability (for example, a rubber sheet or a resin sheet). As described above, the resin molded body 100 is covered with the periphery (outer periphery) of the laminate 15. ... is defined as a water storage space A that can store water by blocking the space between the outside and the outside. Further, the water-impervious sheet S also serves to prevent the soil from flowing into the space between the stacked resin molded bodies 100 (water storage space A) when the soil is backfilled.

  In the underground water storage facility 1 according to the present embodiment, as shown in FIG. 1, a gutter 60 is erected so as to be adjacent to the underground water storage tank 10 (a plurality of stacked resin molded bodies 100...). 10 and the ridge 60 are in fluid communication. Thereby, while being able to flow water into the underground storage tank 10 from the dredging 60, water can be discharged | emitted from the underground water storage tank 10 to the dredging 60. In FIG. 1, the inside of the ridge 60 and the underground water storage tank 10 are communicated with each other through the water shielding sheet S <b> 1. For example, the ridge 60 and the plurality of resin molded bodies 100. If it coat | covers with sheet | seat S1, it can be set as the state which made both communicate, without interposing the water shielding sheet S1 between the collar 60 and the resin molding 100 .... And the overflow pipe 61 for discharging water when it becomes a predetermined water level is connected to the upper part which becomes the earth surface vicinity.

  The plurality of resin molded bodies 100 are shaped so that, when stacked, a water storage space A for storing water is formed between the resin molded bodies 100 that overlap one above the other. As shown in FIGS. 3A, 3B, and 3C, the resin molded body 100 according to this embodiment has a plurality of convex portions 102 formed on one surface, The water storage space A is formed between the resin molded bodies 100 by overlapping one surface of one resin molded body 100 overlapping with the other surface of the other resin molded body 100. Yes.

  The arrangement and shape of the convex portions 102 can be variously set, but in the case of the resin molded body 100 according to the present embodiment, each convex portion 102 has a box shape (pyramidal frustum shape) tapered upward. ). And the resin molding 100 which concerns on this embodiment has several convex part 102 ... arrange | positioned at the matrix form in planar view. That is, the resin molded body 100 is formed with a plurality of rows of convex groups 101a, 101b, 101c, and 101d in which a plurality of convex portions 102 form a row.

  And the resin molding 100 ... which concerns on this embodiment from each convex part 102 ... on both sides of the alignment direction of each convex part 102 ... which forms a line in order to comprise each convex part group 101a, 101b, 101c, 101d. Further, a support portion 103 that protrudes with a small protrusion amount is formed. Furthermore, the resin molded body 100 has an opening (not shown) for inserting the convex portion 102 on the other surface, and both sides of the convex portion groups 101a, 101b, 101c, and 101d in parallel with respect to the opening. A plurality of recesses 104 into which the support part 103 is fitted is formed. The opening and the concave portion 104 are formed corresponding to the arrangement of the convex portion 102 and the support portion 103.

  Accordingly, when the plurality of resin molded bodies 100 are stacked, the resin molded bodies 100 are arranged so as to be rotated by 90 ° along the surface direction (horizontal plane) in order, as shown in FIG. A convex portion (a portion corresponding to the convex portion group 101a, 101b, 101c, 101d on one surface side) 105 formed on the other surface side of the upper resin molded body 100 ... is placed on the support portion 103 of ... As shown in FIG. 5, the convex portions 102 of the upper resin molded body 100... Enter another opening of the other resin molded body 100. It will be in the state where it was fitted to. As a result, the plurality of resin molded bodies 100 can form the water storage space A between the resin molded bodies 100 that overlap in the vertical direction without the entire surfaces of the resin molded bodies 100 that are vertically stacked facing each other being in close contact with each other. ing.

  Returning to FIG. 3A, each resin molded body 100 is formed with water passage holes 106 penetrating vertically, and water storage spaces A and A formed with the resin molded body 100 as a boundary in a stacked state. It is designed to communicate with each other.

  In each of the resin molded bodies 100... According to the present embodiment, through holes 107 for inserting the extending bodies 40 are formed at predetermined positions. In the present embodiment, the top surfaces of the plurality of convex portions 102 are formed. In the present embodiment, as described above, the resin molded body 100 is rotated by 90 ° along the surface direction in order when stacked, so that the through-hole 107 is rotated by the resin molded body 100. It is arranged on a circle (not shown) with a constant radius centered on the center. In addition, since the resin molding 100 shown in FIG. 3A is provided with four protrusions 102 vertically and horizontally in plan view, the through holes 107 of the four protrusions 102 around the center of the plane have the plane. The through-holes 107 of the eight convex portions 102 that are located on the first circle C1 centered on the center and lined up in series with the four convex portions 102 are formed on the first circle C1 with the plane center as the center. A third hole having a diameter larger than the diameter of the second circle C2 with the through hole 107 of the convex portion 102 located at the four corners being located on the second circle C2 having a diameter larger than the diameter and centering on the plane center. It is located on the circle C3.

  Accordingly, when the plurality of resin molded bodies 100 are stacked, the through holes 107 of the plurality of stacked resin molded bodies 100 can be formed even if the resin molded bodies 100 are rotated by 90 ° sequentially around the center line extending in the stacking direction. All are continuous in the stacking direction, and the extended body 40 can be inserted through the stacked body 15 (a plurality of resin molded bodies 100...). Even if a plurality of through holes 107 are formed in one resin molded body 100 in this way, it is not always necessary to insert the extending bodies 40 through all the through holes 107. As shown in FIGS. The extending body 40 may be inserted into at least one of the through holes 107. However, when the strength of the single extending body 40 is insufficient with respect to the upward force, a plurality of extending bodies 40 are provided and inserted into the plurality of through holes 107 to counter the upward force. It goes without saying that the strength that can be achieved is ensured.

  Returning to FIGS. 1 and 2, the floor plate 20 is set to a size that covers substantially the entire upper surface of the underground water tank 10. And the floorboard 20 can be comprised with metal or a concrete plate material, and the concrete floorboard previously shape | molded by the plate shape similarly to the base | substrate 30 is employ | adopted in this embodiment.

  The base body 30 is configured to be able to resist buoyancy acting on the plurality of resin molded bodies 100. The base body 30 is made of metal, concrete, reinforced concrete, or the like, and in this embodiment, the weight is set so as to be able to resist buoyancy acting on the plurality of resin molded bodies 100. The base body 30 according to the present embodiment is composed of a concrete floor plate formed in advance in a plate shape having a substantially rectangular shape in plan view.

  The base body 30 is configured such that a plurality of laminated bodies 15 in which a plurality of resin molded bodies 100 are stacked can be arranged in one or a plurality of rows in plan view, and the base body 30 according to the present embodiment includes the plurality of laminated bodies 15. ... can be arranged in two or more rows vertically and horizontally. That is, the base body 30 according to the present embodiment is formed so that the plurality of stacked bodies 15 can be arranged in a matrix in a plan view.

  As shown in FIG. 2, the base body 30 according to the present embodiment is formed with a through hole 300 through which the extension body 40 is inserted corresponding to the arrangement of the laminated body 15. As described above, in the base body 30 according to the present embodiment, since the stacked body 15 is arranged in a matrix in a plan view, the through holes 300 are also arranged in a matrix corresponding to the arrangement of the stacked body 15. Further, in the present embodiment, a counterbore 310 that accommodates a retaining member 400 described later is formed on the other surface of the base body 30 in correspondence with the through hole 300. Therefore, the counterbore 310 is also arranged in a matrix with respect to the lower surface of the base body 30.

  The extension body 40 may be a metal bar, a rope such as a chain or a wire, and the extension body 40 according to the present embodiment is a metal bar (deformed bar steel). It is configured. The extended body 40 is inserted into a plurality of resin molded bodies 100 (stacked through holes 107) stacked on the base body 30 so that the upper end projects upward from the uppermost resin molded body 100. Is provided. And since the extended body 40 (bar) is set to a fixed size, the upper end side of the extended body 40 is the uppermost resin molded body 100 depending on the number (height) of the stacked resin molded bodies 100. However, in such a case, it is best to add another bar (extension 40) to the bar (extension 40) extending from the base 30. The upper end side of the bar is projected from the resin molded body 100.

  For example, the rods (extensions 40) are connected to each other by forming a male screw at the end of one rod (extension 40) and at the end of the other rod (extension 40). A female screw that can be screwed to the male screw is formed, and these are screwed into a single extended body 40, or flanges are provided at the ends of both bars, and both flanges are fastened with bolts / nuts. Then, a single extended body 40 may be used.

  The extension body 40 is attached to the base body 30 so as not to be detached. That is, on one end (lower end) side of the extension body 40, a retaining body 400 that can be locked to the base body 30 is provided to prevent the extension body 40 from coming out upward. In the present embodiment, one end (lower end) side is inserted into the through hole 300 formed in the base body 30, and the retaining member 400 is attached to an end portion that extends from the other surface (lower surface) of the base body 30. The retaining member 400 is formed of a metal plate having a portion facing the lower surface of the base body 30 set to be larger than the hole diameter of the through hole 300, and is accommodated in the counterbore 310. The retaining body 400 is welded to the lower end of the extending body 40 and is locked to the base body 30 (the inner surface of the counterbore 310) when a pulling force is applied to the extending body 40 upward. ing.

  As described above, the levitation regulating body 50 is arranged so as to face the uppermost resin molded body 100 on the upper side. And since the laminated body 15 is arrange | positioned in the matrix form on the base | substrate 30 as mentioned above, the levitation regulation body 50 is provided for every laminated body 15, or it is provided so that the some laminated body 15 may be straddled. To do. In this embodiment, since the floor board 20 disposed on the underground water storage tank 10 is provided as described above, the floor board 20 is employed as the levitation regulator 50. That is, since the floor board 20 is disposed on the underground water storage tank 10 so as to face the uppermost resin molded body 100 of each laminate 15, a plurality of resin molded bodies are used in the present embodiment. It is used as a levitation regulating body 50 that regulates levitation of 100. In addition, in this embodiment, since the floor board 20 and the levitation restriction body 50 are the same, in the following description, the levitation restriction body 50 may be referred to as the floor board 20 without particular notice.

  The levitation regulating body 50 floats the uppermost one of the plurality of stacked resin molded bodies 100... To a predetermined level or higher so that the resin molded bodies 100 to be floated do not lift the floor board 20 (or covering soil). It is only necessary to be able to regulate this, and it may be arranged at an interval with respect to the uppermost resin molded body 100, or may be arranged so as to approach the uppermost resin molded body 100. In the present embodiment, the base sheet S2 is disposed on the uppermost resin molded body 100, and the levitation regulating body 50 is disposed in contact with the base sheet S2. Depending on the stacking height of the resin molded bodies 100, a gap may be formed between the uppermost resin molded body 100 and the levitation regulating body 50. In such a case, as shown in FIG. In addition, a resin spacer B that fills a gap between the resin molded body 100 and the levitation regulating body 50 is interposed.

  The levitation regulating body 50 (floor plate 20) is provided so that an upward force can be transmitted to the extended body 40 protruding upward from the uppermost resin molded body 100. In the present embodiment, the floor plate 20 is in a state in which the upper end portion of the extended body 40 is inserted so as to prevent interference with the extended body 40 extended from the uppermost resin molded body 100 (base sheet S2). It has become.

  In order to transmit the upward force acting on the floor board 20 (the levitation regulating body 50) to the extension body 40, for example, a nut is screwed into the extension body 40 inserted into the floor board 20, or the floor board is However, in this embodiment, since the deformed steel bar is used for the extension body 40, the floor board is used. The extension body 40 is inserted into a hole (not shown) drilled in 20 and filled with concrete so that the extension body 40 and the floor board 20 are integrally connected while being prevented from coming off. And since the top of the floor board 20 is covered, the underground water storage facility 1 is in a state in which no configuration exists on the ground.

  The underground water storage facility 1 according to the present embodiment has the above configuration, and the operation will be described next. In the state where gas remains in the water storage space A (the amount of water is small or there is no water), when the groundwater level rises due to infiltration of rainwater or the like, the underground water tank 10 is immersed in the groundwater, Buoyancy is generated in the laminate 15. Then, since the underground water storage facility 1 according to the present embodiment is provided so that the levitation regulating body 50 faces the uppermost resin molded body 100..., The uppermost resin molded body 100 of the laminate 15 to be floated. .. Try to push up the levitation regulating body 50 upward, but because the levitation regulation body 50 is connected to the extension body 40, the buoyancy regulation body 50 is in a state of being opposed to the buoyancy of the resin molded body 100.

  Then, since the extended body 40 is prevented from coming off from the base body 30, buoyancy acting on the plurality of resin molded bodies 100... Acts to lift the base body 30. Since the weight is set so as to counteract the buoyancy acting on ..., the lifting of the base body 30 is restricted. Since the underground water storage facility 1 according to the present embodiment employs the heavy floor plate 20 as the levitation regulating body 50, not only the weight of the base body 30 but also the weight of the floor plate 20 contributes to the buoyancy of the plurality of resin molded bodies 100. Acts to counteract. Thereby, even if the water level in the underground water storage tank 10 becomes high, the floating of the plurality of resin molded bodies 100 can be reliably controlled.

  When rainwater flows into the underground water storage tank 10 via the ridge 60, the water level in the underground water storage tank 10 rises, and the plurality of stacked resin molded bodies 100 are sequentially immersed from below. It will follow.

  When the specific gravity of the resin molded bodies 100 is smaller than the specific gravity of water, the buoyancy increases as the number of the resin molded bodies 100 immersed in the water in the underground water storage tank 10 increases, and finally the stacking is performed. Almost all of the plurality of resin molded bodies 100 (laminated body 15) thus formed are about to float. Even in this case, the uppermost resin molded body 100 of the laminate 15 to be levitated tries to push up the levitation regulating body 50, but the levitation regulation body 50 is connected to the base body 30 through the extension body 40. Therefore, the levitation of the plurality of resin molded bodies 100 is reliably regulated.

  And the underground water storage equipment 1 which concerns on this embodiment WHEREIN: Since the gutter 60 arrange | positioned adjacent to the underground water storage tank 10 is fluidly connected with the underground water storage tank 10, when an allowable water storage amount is exceeded, an underground water storage tank When the water in 10 flows into the dredger 60 and the dredger 60 becomes higher than a predetermined water level, it is discharged through the overflow pipe 61.

  As described above, according to the underground water storage facility 1 according to the present embodiment, the base body 30 on which the stacked body 15 (the plurality of resin molded bodies 100...) Whose periphery is covered with the water shielding sheet S1 is placed, and the base body 30. An extending body 40 that extends upward and is provided so as to be able to transmit at least an upward force to the base body 30 and is disposed so as to face at least a part of the uppermost resin molded body 100. In addition, the extension body 40 is provided with a levitation regulating body 50 provided so as to be able to transmit at least an upward force to the extension body 40, and the base body 30 can counter buoyancy acting on the plurality of resin molded bodies 100. Therefore, the necessary water can be reliably stored, and the levitation of the plurality of resin molded bodies can be reliably regulated with a simple configuration.

  Moreover, the floor board 20 which covers the underground water storage tank 10 is provided, and the floor board 20 is provided so as to be able to transmit at least an upward force to the extension body 40 and is used as a levitation regulating body 50. The body 50 and the floor board 20 do not need to be provided separately, and the weight of the floor board 20 (the levitation regulating body 50) in addition to the base body 30 can contribute to the regulation of the levitation of the plurality of resin molded bodies 100.

  Further, since the extended body 40 is inserted into the plurality of resin molded bodies 100, the resin molded body 100 exists around the extended body 40, and the extended body 40 is moved upward. The levitation regulating body 50 provided so as to be able to transmit the above force can be reliably opposed to the uppermost resin molded body 100. Thereby, the resin molding 100 to be levitated can be reliably regulated by the levitation regulating body 50.

  Further, since the extended body 40 is provided with a retaining body 400 inserted into the base body 30 and locked to the base body 30 at the lower end side, the resin molded body 100 tries to push up the levitation regulating body 50. Even if a force acts, the extended body 40 is not pulled out from the base body 30, and the base body 30 can be reliably opposed to the buoyancy of the resin molded body 100.

  And since the said base | substrate 30 is set to the weight which can oppose the buoyancy which acts on the some resin molding 100 ..., even if it does not fix the base | substrate 30 to a ground using a pile, a foundation bolt, etc., resin The buoyancy acting on the molded body 100 can be countered.

  It should be noted that the underground water storage facility of the present invention is not limited to the above embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

  In the above embodiment, the plate-shaped retaining body 400 is welded to the lower end of the extending body 40, and the retaining body 400 is accommodated in the counterbore 310 formed on the lower surface of the base body 30, thereby preventing the extending body 40 from coming off. However, the present invention is not limited to this. For example, as shown in FIG. 6, the retaining member 400 may be brought into direct contact with the lower surface of the base body 30 without being housed in the counterbore 310. That is, the retaining member 400 may be locked to the lower surface of the base body 30 without providing the counterbore 310 on the base body 30. When the base body 30 is formed of concrete, when the concrete is formed into a plate shape, a retaining body 400 previously connected to the lower end of the extension body 40 is embedded in the concrete before solidification, and the base body 30 is formed. The extension body 40 may be connected together with (solidification of concrete).

  In the above embodiment, the plate-shaped retaining member 400 is welded to the lower end of the extending body 40. However, the present invention is not limited to this, and for example, the lower end portion of the extending body 40 inserted through the base body 30 is plate-shaped. The retaining member 400 may be attached by being inserted through the retaining member 400 and screwing a nut N into the lower end portion. In this case, as shown in FIG. 7, the retaining member 400 may be attached by sandwiching the retaining member 400 with two nuts N and N screwed to the extending member 40, or the retaining member 400 extends as shown in FIG. 8. The nut N may be screwed into only the lower end of the extension body 40 so as not to fall off the body 40.

  In the above embodiment, the upper end portion of the extended body 40 is inserted into the hole of the floor plate 20, and these are connected by filling the hole with concrete. However, the present invention is not limited to this, for example, As shown in FIGS. 7 to 9, the extended body 40 may be passed through the floor board 20 (the levitation regulating body 50), and the nut N may be screwed into the extended body 40 protruding from the upper surface of the floor board 20. Of course, a washer P may be interposed between the floor plate 20 and the nut N as shown in FIG.

  Such a configuration is not limited to the case where the floor plate 20 is used as the levitation regulating body 50, and the same applies to the case where the levitation regulation body 50 is configured by a member different from the floor plate 20 as described later.

  In the above embodiment, the floor plate 20 that closes the upper part of the underground water storage tank 10 is also used as the levitation regulating body 50. However, the present invention is not limited to this. For example, as shown in FIG. The levitating restricting body 50 may be provided separately from the floor board 20 without connecting the protruding body 40. Even in this case, the levitation regulating body 50 is disposed so as to face the uppermost resin molded body 100... And of course, can be provided so that at least the upward force can be transmitted to the extension body 40. It is.

  The levitation regulating body 50 may be any material such as a plate or a bar as long as it is connected to the extended body 40. That is, various shapes can be adopted as long as the resin molded bodies 100 can float on the upper surface of the uppermost resin molded bodies 100. Further, the levitation regulating body 50 is not limited to the one formed so as to straddle the plurality of resin molded bodies 100 (laminated body 15), and may of course be provided for each laminated body 15.

  In the above embodiment, the floor plate 20 disposed on the underground water storage tank 10 is provided, and the floor plate 20 is covered with soil. However, the present invention is not limited to this. For example, the floor plate 20 is not provided. The underground water storage tank 10 (a plurality of resin molded bodies 100 stacked in the inside) may be directly covered. That is, the uppermost resin molded body 100 may be directly covered with soil, or the base sheet S2 may be disposed on the uppermost resin molded body 100 to cover the soil. In this case, since the floor board 20 as the levitation regulating body 50 is not provided, it may be the same as the case where the levitation regulation body 50 different from the floor board 20 is provided as described above.

  In the above embodiment, the extended body 40 is inserted through the plurality of stacked resin molded bodies 100. However, the present invention is not limited to this, and for example, as shown in FIG. A pair of extending bodies 40 are provided so as to be positioned on both sides of the plurality of stacked resin molded bodies 100... And the levitation regulating body 50 is disposed so as to face the uppermost resin molded body 100. The extended body 40 may be connected to the levitation regulating body 50. Even in this case, the buoyancy (upward force) of the plurality of resin molded bodies 100 to be levitated can be transmitted to the base body 30 via the levitation regulating body 50 and the pair of extending bodies 40. It is possible to counter the buoyancy of the resin molded body 100.

  Further, a bar material as the extending body 40 is disposed adjacent to the resin molded body 100... And the levitation regulating body 50 is extended from the extending body 40 in the direction orthogonal to the axis thereof, so that the uppermost resin molded body 100 is disposed. You may make it oppose .... In this way, as a result of the resin molded bodies 100 to be levitated being locked to the levitation regulating body 50, these levitation can be regulated. In this case, two or more extending bodies 40 are provided at intervals around the plurality of stacked resin molded bodies 100 (laminated body 15), and the levitation regulating body 50 is connected to each extending body 40. By doing so, the levitation of the uppermost resin molded body 100 can be regulated by the plurality of levitation regulating bodies 50.

  In the above embodiment, the base 30 is made of concrete, but is not limited to this, and may be a metal plate. In this case, as an aspect in which the extension body 40 is connected to the base body 30 so that an upward force can be transmitted, the retaining body 400 is provided at the lower end of the extension body 40 inserted through the base body 30 as in the above embodiment. It may be connected, or the lower end side of the extended body 40 may be inserted into the base body 30 and the nut N may be screwed into an end portion protruding from the lower surface of the base body 30. Alternatively, the lower end of the extension body 40 may be welded to the upper surface of the base body 30, or a flange may be connected to the lower end of the extension body 40, and the flange may be screwed to the upper surface of the base body 30.

  In the above-described embodiment, a concrete floor board formed in advance is used for the base body 30. However, the present invention is not limited to this. For example, concrete is placed in a recessed portion excavated before stacking a plurality of resin molded bodies 100. Then, a foundation may be constructed, and a plurality of resin molded bodies 100 may be stacked using the foundation (foundation concrete) as the base body 30. When the foundation concrete is used as the base body 30 as described above, the foundation concrete (base body 30) may be formed integrally with a pile driven into the ground. If it does in this way, since the pulling-out force of the pile driven into the ground will act so as to oppose the buoyancy of the plurality of resin molded bodies 100, the weight of the foundation concrete acts on the resin molded bodies 100. It is not always necessary to set the weight against buoyancy. However, since the place where the underground water storage facility 1 is installed may be a soft ground or the like, it is preferable that the foundation concrete is set to a weight that opposes the buoyancy acting on the resin molded body 100.

  In the said embodiment, although the extension body 40 was comprised with the deformed steel bar, it is not limited to this, For example, a simple round bar may be sufficient. In this case, since there is no unevenness on the surface, it is difficult to connect to the floor board 20 through the concrete as in the above embodiment. Therefore, as described above, the modes shown in FIGS. 7 and 8 may be adopted. In addition, even if a deformed steel bar is adopted for the extended body 40 as in the above embodiment, if the end portion is threaded, the floor plate 20 (the levitation regulating body 50) and the nut N are used as shown in FIG. It can be connected to the substrate 30.

  And in the said embodiment, although the extension body 40 was comprised with the bar, it is not limited to this, For example, you may employ | adopt a rope, such as a chain and a wire rope, as the extension body 40. Also in this case, it goes without saying that one end side of the extended body 40 is connected to the base body 30 so as not to be detached.

  In the above embodiment, the extension body 40 is inserted into the base body 30 and is prevented from coming off on the lower surface side of the base body 30. However, the present invention is not limited to this. For example, a flange is provided at the lower end of the extension body 40. The flanges may be connected and fixed to the upper surface of the base 30 with screws. In this case, it goes without saying that the proof strength by screw fixing is more than the buoyancy acting on the resin molded body 100. The connection between the levitation regulating body 50 and the extension body 40 is the same.

  In the above-described embodiment, the plurality of resin molded bodies 100 are covered with the water shielding sheet (water shielding sheet) S1 together with the base body 30, but the present invention is not limited to this. Only the outer periphery of the body 100 (laminated body 15) is covered with the water shielding sheet S1, or only the outer periphery of the plurality of resin molded bodies 100 (laminated body 15) and the base body 30 is covered with the water shielding sheet 1. Also good.

The schematic sectional drawing of the underground water storage equipment concerning one embodiment of the present invention is shown. The partial expanded sectional view which abbreviate | omitted a part of underground water storage equipment concerning the embodiment is shown. It is explanatory drawing of the resin molding employ | adopted for the underground water storage equipment which concerns on the embodiment, Comprising: (a) shows a top view, (b) shows the X arrow directional view of (a), (c ) Shows a view in Y direction of (a). The partial cross section figure of the state which piled up the resin molding of the underground water storage equipment which concerns on the embodiment is shown. The partial cross section figure of the state which piled up the resin molding of the underground water storage equipment which concerns on the embodiment is shown. The schematic sectional drawing of the underground water storage equipment which concerns on other embodiment of this invention is shown. The schematic sectional drawing of the underground water storage equipment concerning another embodiment of the present invention is shown. The schematic sectional drawing of the underground water storage equipment concerning another embodiment of the present invention is shown. The schematic sectional drawing of the underground water storage equipment concerning another embodiment of the present invention is shown. The schematic sectional drawing of the underground water storage equipment concerning another embodiment of the present invention is shown. The schematic sectional drawing of the underground water storage equipment concerning another embodiment of the present invention is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Underground water storage equipment, 10 ... Underground water storage tank, 15 ... Laminated body, 20 ... Floor board, 30 ... Base | substrate, 40 ... Extension body, 50 ... Lifting regulation body, 60 ... Coral, 61 ... Overflow pipe, 100 ... Resin molding Body, 101a, 101b, 101c, 101d ... convex portion group, 102 ... convex portion, 103 ... support portion, 104 ... concave portion, 106 ... water passage hole, 107 ... through hole, 300 ... through hole, 310 ... counterbore, 400 ... Stopper, A ... Water storage space, B ... Spacer, E ... Soil, N ... Nut, P ... Washer, S1 ... Water shielding sheet, S2 ... Base sheet

Claims (5)

  Underground water storage in which a plurality of stacked resin molded bodies are disposed in the ground, and at least the outer periphery of the plurality of stacked resin molded bodies is covered with a water shielding sheet to form a water storage space between the resin molded bodies. In an underground water storage facility provided with a tank and covered on the underground water storage tank, a base on which a plurality of resin molded bodies are placed, and an upward force extending from the base to the base, Is disposed so as to face at least a part of the uppermost resin molded body on the upper side, and at least an upward force can be transmitted to the extended body. An underground water storage facility, wherein the base is configured to be capable of resisting buoyancy acting on a plurality of resin molded bodies.   The underground water storage facility according to claim 1, further comprising a floor plate that covers the upper surface of the underground water storage tank, wherein the floor plate is provided so as to be capable of transmitting at least an upward force to the extension body to be a levitation regulating body. .   The underground water storage facility according to claim 1 or 2, wherein the extension body is inserted through a plurality of resin moldings.   The underground water storage facility according to any one of claims 1 to 3, wherein the extension body is provided with a retaining body that is inserted into the base body and locked to the base body.   The underground water storage facility according to any one of claims 1 to 4, wherein the base body is set to a weight that can resist buoyancy acting on a plurality of resin molded bodies.

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