JP2001214474A - Side plate for underground water storage tank and underground water storage tank using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side plate for an underground water storage tank which can improve durability and can be constructed easily and to provide an underground water storage tank using it. SOLUTION: An underground water storage tank 11 which will be buried under the ground is provided with a peripheral wall 12 formed into a cylindrical shape, a bottom plate 13 placed on the bottom part or the peripheral wall 12, a top plate 14 placed on the top of the peripheral wall 12, and arc-shaped multiple, side plates 16, 17 which are joined to form the peripheral wall 12 of the tank 11 and are formed into shapes of trapezoid when seen from a direction of the radius.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side plate for an underground water storage tank for constructing an underground water storage tank used as a fire prevention water storage tank or a water receiving tank, and an underground water storage tank using the same.

[0002]

2. Description of the Related Art In general, an underground water storage tank used as a fire prevention water storage tank or a water receiving tank is formed by assembling a circular arc-shaped side plate having a rectangular shape as viewed from an axial direction to form a cylindrical outer peripheral wall. The wall is sunk on the ground by the submersion method, then concrete is cast on the bottom and the bottom slab is constructed, then the top slab is arranged on the top and further backfilled to build in the ground It has become so.

[0003]

By the way, when the side plates having a rectangular shape as viewed from the axial direction are assembled into a cylindrical outer peripheral wall as described above, the outer surface in the radial direction is formed at the joint between the side plates. Then, the joint plates are attached to connect the side plates. However, since the joint plate on the outer surface in the radial direction of the outer peripheral wall is exposed to the ground, corrosion and the like are likely to occur, and there is a problem from the viewpoint of durability. Also, if the joint plate is attached to the joint between the side plates from the outer surface in the radial direction, it is necessary to work from the side on the high side plate, so after attaching one joint plate, When the construction position is moved to attach another joint plate, there is a problem that the movement is not easy and the construction is complicated.

[0004] Accordingly, an object of the present invention is to provide a side plate for an underground water storage tank capable of improving durability and easily performing construction, and an underground water storage tank using the same.

[0005]

In order to achieve the above object, a side plate for an underground water tank according to the present invention is provided on an outer peripheral wall formed in a cylindrical shape and a bottom portion of the outer peripheral wall. A bottom plate and a top plate provided above the outer peripheral wall, the outer peripheral wall of an underground water storage tank buried in the ground is formed by joining a plurality of the outer peripheral walls, and has a radius of It is characterized by being formed in a trapezoidal shape when viewed from the direction.

As described above, since it is formed in a trapezoidal shape as viewed from the radial direction, it is possible to join the adjacent ones in the circumferential direction with the short side and the long side opposite to each other. Therefore, the adjacent members joined in this manner can be connected by the connecting member inserted from above.

[0007] The underground water storage tank according to claim 2 of the present invention comprises:
An outer peripheral wall formed in a cylindrical shape, a bottom plate provided at the bottom of the outer peripheral wall, and a top plate provided at an upper portion of the outer peripheral wall are buried in the ground, and the outer peripheral wall is , A plurality of arc-shaped side plates formed in a trapezoidal shape as viewed from the radial direction,
It is characterized in that objects adjacent in the circumferential direction are joined with their short sides and long sides reversed.

As described above, a plurality of arc-shaped side plates formed in a trapezoidal shape as viewed from the radial direction are joined together in a state in which the short sides and the long sides are opposite to each other in the circumferential direction. Since the outer peripheral wall is formed, adjacent ones thus joined can be connected by a connecting member inserted from above.

The underground water storage tank according to claim 3 of the present invention comprises:
According to the second aspect, the side plates adjacent to each other in the circumferential direction are connected by an inclined connecting member inclined with respect to the axial direction.

As described above, since the side plates adjacent in the circumferential direction are connected by the inclined connecting member inclined with respect to the axial direction, the angle of the inclined connecting member is changed in the connecting direction of the adjacent side plates. Can be closer.

[0011] The underground water storage tank according to claim 4 of the present invention comprises:
4. The axial connection member according to claim 2, wherein the outer peripheral wall has a plurality of the side plates stacked in the axial direction, and the side plates adjacent in the axial direction penetrate in the axial direction. 5. It is characterized by being connected by.

As described above, since the side plates adjacent in the axial direction are connected by the axial connecting member penetrating in the axial direction, the connecting direction and the direction of the axial connecting member coincide.

[0013] The underground water storage tank according to claim 5 of the present invention comprises:
Regarding those according to any one of claims 2 to 4,
It is characterized in that a plurality of seal members are provided in the radial direction on the joint surface between the side plates.

As described above, since a plurality of sealing members are provided in the radial direction on the joint surface between the side plates, the sealing can be surely performed.

The underground water storage tank according to claim 6 of the present invention comprises:
Regarding those according to any one of claims 2 to 5,
Concave concave portions are formed on the joint surfaces of the side plates, and a bridge member is provided in a space formed by the concave portions.

As described above, since the bridge member is provided in the space formed by the concave portions facing each other on the joint surface between the side plates, the shearing force between the side plates can be secured.

The underground water storage tank according to claim 7 of the present invention comprises:
According to a sixth aspect of the present invention, the piece member can be fastened and fixed to an insert embedded in the concave portion.

As described above, since the bridge member can be fastened and fixed to the insert embedded in the concave portion, the shear force between the side plates can be more reliably secured.

The underground water storage tank according to claim 8 of the present invention comprises:
Regarding those according to any one of claims 2 to 7,
An auxiliary ring is provided at a lower end of the outer peripheral wall, and the bottom slab is formed of concrete cast integrally with the auxiliary ring.

Thus, even if the outer peripheral wall is formed by constructing a plurality of side plates, the side plates can be easily assembled on the auxiliary ring. Moreover, since the bottom slab is formed of concrete cast so as to be integrated with the auxiliary ring, the bottom slab and the outer peripheral wall can be easily and reliably connected.

[0021] The underground water storage tank according to claim 9 of the present invention comprises:
According to the eighth aspect, a seal member is provided at a lower portion of the auxiliary ring so as to be interposed between the concrete and the concrete in a circumferential direction.

As described above, since the sealing material interposed between the concrete and the circumferential portion is provided below the auxiliary ring, the sealing performance of this portion can be more reliably improved.

According to a tenth aspect of the present invention, in the underground water storage tank according to any one of the second to ninth aspects, the underground water tank flows into a gap formed at an end of a joining surface between the side plates. The characteristic seal material is putty-buried.

As described above, since the gap formed at the end of the joining surface between the side plates is putty-buried with the fluid sealing material, the sealing property at this portion can be more reliably improved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the underground water storage tank 11 includes a cylindrical outer peripheral wall 12, a bottom plate 13 provided at the bottom of the outer peripheral wall 12, and an outer peripheral wall 12.
And a top plate 14 provided on the upper part of the ground.

First, the outer peripheral wall 12 will be described. As shown in FIG. 1 to FIG. 3, the outer peripheral wall 12 is configured by joining a plurality of arc-shaped, specifically, two types of side plates (side plates for underground water storage tanks) 16 and 17.

Here, two types of side plates 16 and 17 made of concrete are used. The “axial direction” in the following description of the side plates 16 and 17 is the side plate 1
The direction of the center axis of the 6, 17 arc, "radial direction"
Is the radial direction of the arc of the side plates 16 and 17 (in other words, the thickness direction), and the “circumferential direction” is the circumferential direction of the arc of the side plates 16 and 17.

As shown in FIGS. 3 and 4, the first type of side plate 16 has an isosceles trapezoidal shape as viewed from the radial direction, and is arranged with the long side being on the lower side and the short side being on the upper side. The angles of the side portions (joining surfaces) 21 and 21 on both sides in the circumferential direction with respect to the lower surface portion (joining surface) 20 on the long side are made equal (specifically, 60 °).

The side plate 16 has a through hole 2 at a predetermined position in the center in the radial direction, which penetrates in parallel to the axial direction from the upper surface (joining surface) 22 on the short side to the lower surface 20 on the long side.
3 are formed at a predetermined equal pitch in three circumferential directions.

Further, both side portions 21, 21 of the side plate 16 are provided.
At a predetermined position in the center in the radial direction,
Inserts (inclined connecting members) 24a and 24b are embedded at two positions obliquely at a predetermined angle with respect to the axial direction so as to be shifted in the circumferential direction.

In addition, in the center of the upper surface portion 22 of the side plate 16 in the radial direction and at a predetermined position adjacent to the same side of all the through holes 23 in the circumferential direction, the predetermined position is parallel to the axial direction. Insert 25 is embedded.

Further, a through hole 23 is provided at the center in the radial direction of the upper surface portion 22 of the side plate 16 and in the circumferential direction.
A concave portion 27 is formed at a predetermined position between them,
At the bottom of each recess 27, an insert 28 is buried in parallel with the axial direction.

In addition, an insert parallel to the axial direction is provided at a predetermined position in the center of the lower surface portion 20 of the side plate 16 in the radial direction and inside each of the outer through holes 23 in the circumferential direction. 29 are buried.

Further, a concave portion 30 is formed at a predetermined position in the center of the lower surface portion 20 of the side plate 16 in the radial direction and inside each of the inserts 29.
The concave portions 30 and the concave portions 27 of the upper surface portion 22 are arranged so as to correspond to each other in the same straight line parallel to the axial direction.

In addition, as shown in FIG. 4, a plurality of continuous seal grooves 32, specifically two in the radial direction, are formed in the upper surface portion 22, both side surface portions 21 and lower surface portion 20 of the side plate 16. Through hole 23, inserts 24a, 24
b, 25, 29 and recesses 27, 30 at both outer positions. Here, these seal grooves 32 are
As shown in (1), a seal member 33 made of an annular water-swelling rubber or the like is disposed. That is, these sealing materials 33 are provided over the entire length of the sealing grooves 32.
Will be wound around the side plate 16 in the state where
As a result, the side plate 16 is provided with a plurality of, specifically, two, seal materials 33 in the radial direction. The seal member 33 has a thickness that protrudes a predetermined amount (for example, about 1 mm) from the seal groove 32 in a state where the seal member 33 is disposed in the seal groove 32.

Another type of side plate 17 is shown in FIGS.
As shown in the figure, the base is formed in the shape of an equilateral trapezoid when viewed from the radial direction, and is disposed with the short side down and the long side up, and the upper surface (joining surface) 35 on the long side , The angles of the side surfaces (joining surfaces) 36 in the circumferential direction are equal to each other and equal to the angle of the side surface 21 to the lower surface 20 of the side plate 16.

As in the case of the side plate 16, the side plate 17 is located at a predetermined position in the center in the radial direction, and is parallel to the axial direction from the upper surface 35 on the long side to the lower surface (joining surface) 37 on the short side. Penetrating through holes 23 are formed at predetermined equal pitches in three circumferential directions.

Further, on both side portions 36 of the side plate 17,
Each is located at two places at the center in the radial direction,
Oblique through-holes 39a and 39b penetrating to the upper surface 35 at a predetermined angle with respect to the axial direction are formed at different positions in the circumferential direction. Concave portions 40a and 40b are formed at the center in the radial direction on the upper surface 35 side of each of the oblique through holes 39a and 39b of the both side surface portions 36.

In addition, at the center of the upper surface 35 of the side plate 17 in the radial direction, adjacent to the same side of all the through holes 23 in the circumferential direction, at the predetermined position adjacent to the same side as the side plate 16, An insert 25 is buried parallel to the direction.

Further, the center of the upper surface portion 35 of the side plate 17 in the radial direction and the through hole 23 in the circumferential direction are provided.
At a predetermined position between them, a concave portion 27 is formed similarly to the side plate 16, and at the bottom of each of these concave portions 27, similarly to the side plate 16, an insert is formed in parallel to the axial direction. 28 are buried.

In addition, the side plate 16 is positioned at the center of the lower surface 37 of the side plate 17 in the radial direction and inside the through holes 23 on both outer sides in the circumferential direction.
Similarly to the above, the insert 29 is buried parallel to the axial direction.

Further, similarly to the side plate 16, the concave portion 30 is located at a predetermined position in the center of the lower surface portion 37 of the side plate 17 in the radial direction and inside each of the two inserts 29.
Are formed. The recess 30 and the upper surface 35
The corresponding recesses 27 are arranged in the same straight line parallel to the axial direction.

In addition, the upper surface 35, both side surface portions 36 and lower surface portion 37 of the side plate 17 are similar to those shown in FIG.
As shown in the figure, a plurality of, specifically, two continuous seal grooves 32 are formed at both outer positions of the through hole 23, the inserts 25, 29, and the recesses 40a, 40b, 27, 30 in the radial direction. . Here, similarly to the above, a seal member 33 made of an annular water-swelling rubber or the like is also arranged in these seal grooves 32 (see FIG. 5). That is, these seal members 33 are wound around the side plate 17 in a state where they are arranged in the seal grooves 32 over the entire length. As a result, the side plate 17 is provided with a plurality of seal members 33 in the radial direction. Will be provided.

As shown in FIG. 3, the side plate 16 has the lower side 20 on the long side and the upper side 22 on the short side, and the upper side 35 on the long side and the short side on the contrary. Lower part 3
7 are arranged alternately in the circumferential direction to form a cylindrical shape. In this case, specifically, a total of four of the two side plates 16 and two The lower cylindrical ring 51 on the side is formed. And
Similarly, on the upper side of the lower ring 51, a cylindrical upper ring 52 is formed by a total of four of the two side plates 16 and the two side plates 17. In this way, the outer peripheral wall 12 is formed by overlapping the lower ring 51 and the upper ring 52 in the axial direction with a plurality of concrete steps.

At this time, when the side plates 16 and 17 that are adjacent to each other in the circumferential direction and make up the side portions 21 and 36, the insert 24a of the side plate 16 and the oblique penetration of the side plate 17 are formed. The holes 39a are arranged on the same straight line with each other, and the oblique bolt (inclined connecting member) 54a made of a PC steel bar is inclined so as to be inclined with respect to the axial direction of the side plates 16 and 17.
Is inserted into the oblique through hole 39a, and one end thereof is screwed to the insert 24a. Further, in this state, the oblique bolt 5
The other end of 4a protrudes upward in the recess 40a, and a nut (inclined connecting member) 56 is screwed into this portion. The bottom of the recess 40a is formed perpendicular to the axial direction of the oblique bolt 54a, and the nut 56 screwed to the oblique bolt 54a contacts the bottom.

Similarly, the insert 24b of the side plate 16 and the through hole 39b of the side plate 17 are also arranged on the same straight line, so that the oblique bolt (inclined connecting member) 54b made of a PC steel bar is used. One end is screwed into the insert 24b through the through hole 39b. further,
In this state, the other end of the oblique bolt 54b projects upward in the recess 40b, and a nut 56 similar to the above is screwed into this portion. In addition, the bottom surface of the recess 40b is formed orthogonal to the axial direction of the oblique bolt 54b.
A nut 56 screwed into the oblique bolt 54b contacts this bottom surface.

As described above, the side plate 16 and the side plate 17 which are adjacent in the circumferential direction have the insert 24 inclined with respect to the axial direction.
a, the oblique bolt 54a and the nut 56, and the insert 24b, the oblique bolt 54b and the nut 56 which are similarly inclined with respect to the axial direction.

After the lower ring 51 is formed by the side plates 16 and 17, the side plates 16 and 17 are placed on the upper side of the lower ring 51.
17, the upper ring 52 is formed. However, the recesses 40 a and 40 b of the upper surface portion 35 of the side plate 17 described above are used to connect the side plate 16 to the lower ring 5 to form the upper ring 52.
This is for accommodating the oblique bolts 54a, 54b and the nut 56 in the lower ring 51 so as not to be obstructed when being superposed on the upper side of the first ring 1.

When the upper ring 52 is formed on the lower ring 51, as shown in FIG. 3 and FIG. By being screwed into the insert 28 of the first embodiment. This piece member 58 has a shape in which a pair of truncated conical portions 61 and 62 having a conical shape with the small diameter side cut off are joined on the large diameter side. Then, the lower truncated cone portion 62 is fitted into the complementary concave portion 27 of the lower ring 51, and in this state, the upper truncated cone portion 61 is fitted.
Has a shape projecting upward from the upper surface portions 22 and 35 of the lower ring 51 on the same plane.

The side plates 16 and 17 of the lower ring 51
The truncated cone 61 of the head 60 of the bridge member 58 attached to all the recesses 27 of the upper ring 5
The side plates 16, 17 of the upper ring 52 are positioned with respect to the lower ring 51 by being fitted into the concave portions 30 of the second side plates 16, 17.

As described above, the side plates 16 of the lower ring 51,
The piece member 58 is arranged in a space 64 formed by the concave portion 27 of the upper ring 17 and the concave portion 30 of the side plates 16 and 17 of the upper ring 52 opposed thereto.
Can be fastened to the insert 28 embedded in the recess 27 with a bolt 59. The piece member 58 does not necessarily need to be fastened to the side plates 16 and 17 with the bolt 59, and as shown in FIG.
Only the ones may be placed in the space 64 without the insert 28.

The side plates 16, 17 and the upper ring 5 of the lower ring 51, which are superposed while being positioned in this manner,
As shown in FIG. 3, the side plates 16 and 17 of the second plate 2 have through holes 23 of the side plate 16 of the lower ring 51 and the side plates 1 of the upper ring 52.
7 are arranged on the same straight line as the corresponding ones, and the through hole 23 of the side plate 17 of the lower ring 51 and the through hole 23 of the side plate 16 of the upper ring 52 correspond to each other. Are arranged on the same straight line.

As described above, the vertical bolt (axial connection member) 67 made of a PC steel rod is inserted in the through hole 23 arranged on the same straight line from the upper ring 52 side in the axial direction. The lower end of the vertical bolt 67 is attached to a fixing nut (axial connection member) 71 of an auxiliary ring 70 described below which penetrates the upper ring 52 and the lower ring 51 and is disposed below the lower ring 51. It is screwed. Further, a nut (axial connection member) 72 is screwed into an upper end projecting upward from the upper ring 52, whereby the auxiliary ring 70, the lower ring 51, and the upper ring 52 are connected. As a result, the upper and lower side plates 16, 17 adjacent in the axial direction are connected to each other by the longitudinal bolt 67, the fixing nut 71, and the nut 72 penetrating in the axial direction.

Next, the bottom plate 13 will be described. Bottom plate 1
2, a metal (specifically, steel) annular auxiliary ring 70 that supports the lower end of the outer peripheral wall 12 from below, as shown in FIG. A concrete slab 74, a reinforcing steel bar 75 (see FIG. 10) disposed in the concrete slab 74, and a prefabricated pit 76 are provided.

The auxiliary ring 70 is formed by connecting circular arc-shaped ring forming bodies 78 shown in FIG. 9 in the circumferential direction, and is arranged with its central axis extending vertically.

The ring forming body 78 fixedly supports the upper plate portion 79 and the lower plate portion 80 made of arc-shaped flat plates on the outer diameter sides of the upper plate portion 79 and the lower plate portion 80 in parallel with each other. An arc-shaped base member 77 having a U-shaped cross section in which a side plate portion 81 curved in an arc shape is integrated;
A joint plate 82 attached to each end of the base member 77 in the circumferential direction, a plurality of concretely two reinforcing plates 83 joined to the side plate portion 81 of the base member 77 at a predetermined pitch,
7 has a guide plate 84 which is not concentric with the side plate portion 81 and is fixed between the two joint plates 82 and the two reinforcing plates 83 in a state arranged below the upper plate portion 79 by a predetermined distance. It is formed by welding and fixing a steel material to the shape.

As shown in FIG. 3, the ring forming body 78 joins the joint plates 82 to each other, and the high tension bolts or the like are formed through the mounting holes 86 formed at the four corners of the joint plate 82, respectively. The bolt 87 and the nut 88 are connected to each other to form an annular shape as a whole. In this case, specifically, one auxiliary ring 70 is formed by four ring forming bodies 78 of 90 degrees each.

Note that, as shown in FIG.
A fluid seal material (seal material) 90 is provided at a lower portion of the base member 77, specifically, at an inner corner between the lower plate portion 80 and the side plate portion 81 of the base member 77 so as to be interposed between the bottom slab concrete 74. Will be applied continuously over the entire circumference. For this reason, a scallop 91 is formed in the reinforcing plate 83 and the joint plate 82 in the circumferential direction so as to enable continuous application of the fluid sealing material 90. Here, the fluid sealing material 90 may be applied to an inner corner portion between the side plate portion 81 and the upper plate portion 79, or to an inside of an intermediate portion of the side plate portion 81. Accordingly, scallops 91 that enable continuous application over the entire circumference are formed on the reinforcing plate 83 and the joint plate 82.

The reinforcing bar 75 is placed on the above-described guide plate 84 of the ring-shaped body 78 having an annular shape and is fixed as necessary, whereby the reinforcing bar 75 is positioned and arranged. In addition, the outer diameter of the auxiliary ring 70 is
The diameter is slightly larger than the outer diameter.

The upper plate 79 of the ring forming body 78 has
As shown in FIG. 10, a through hole 93 penetrating in parallel to the axial direction is provided at a predetermined position in the center in the radial direction.
The parts are formed at a predetermined equal pitch in the circumferential direction. Then, on the lower surface of the upper plate portion 79 at the position where each through hole 93 is formed,
In each case, a supporting plate 95 having a through hole 94 formed in the center in the plate thickness direction is fixed by welding so that the through hole 94 is aligned with the through hole 93 of the upper plate portion 79. The fixing nut 71 is welded and fixed to the through hole 94 of the support plate 95. Then, the above-described vertical bolt 67 is inserted into the through hole 93 of the upper plate portion 79 and the through hole 94 of the support plate 95 and screwed to the fixing nut 71.

Further, as shown in FIG. 9, the axis line is located at a predetermined position in the radial center of the upper plate 79 of the ring forming body 78 and inside each of the through holes 93 on both outer sides in the circumferential direction. A through hole 97 is formed parallel to the direction. The through holes 97 are for temporarily connecting the side plates 16 and 17 of the lower ring 51 of the outer peripheral wall 12 to the ring forming body 78. Specifically, as shown in FIG. In the through hole 97, the lower ring 5
In a state where the corresponding ones of the inserts 29 of the side plates 16 and 17 are aligned, the through holes 9 are formed from below the upper plate portion 79.
The temporary fixing bolt 98 inserted through 7 is screwed into a corresponding one of the insert 29.

In this temporarily connected state, the lower ring 51
In the side plates 16, 17 and the auxiliary ring 70, the corresponding through holes 23 and the corresponding through holes 93, 94 are arranged on the same straight line.

Before performing the temporary connection, if necessary, a fluid sealing material may be provided outside the through-hole 93 in the radial direction of the upper plate 79 of the auxiliary ring 70 so as to be continuous over the entire circumference. The outer peripheral wall 12 will be built on the fluid sealing material.

The prefab pit 76 is shown in FIGS.
As shown in FIG. 2, a plurality of (16 in the figure) connecting bars 104 made of steel or the like are formed on the outer surface of a cylindrical pit main body 103 having a through hole 102 formed in a bottom surface 101 with an upwardly inclined surface. Radially protruding in this state, and the socket 105
Is attached. The pit body 103 is made of reinforced concrete with reinforcing bars 106 and 107 embedded therein, and the through hole 102 is formed in a circular shape at an eccentric position of the bottom surface 101. Joint 104 of prefabricated pit 76
Is embedded in cast-in-place bottom slab 74 as shown in FIG.
Are integrally joined to the bottom slab concrete 74.

The connecting bar 104 is provided so as to project obliquely upward from a step 108 formed on the outer peripheral surface of the pit main body 103. The socket 105 is a plug (not shown)
The through hole 102 is closed by the fitting of the reinforcing bar 10.
6 and is integrally attached to the pit main body 103 in a liquid-tight manner with concrete by a sealing member 109 such as urethane.

At the bottom of the pit body 103 of the prefabricated pit 76, a filter 110 formed by laminating a mesh made of polyethylene or the like and a non-woven cloth is attached by a wire net 111.

Next, the top plate 14 will be described. Top version 1
As shown in FIG. 14, 4 is a disk-like shape, and has a plurality of, specifically, two, shapes divided by a plane including the axis thereof and two planes parallel to and separated from the plane by an equal distance. It comprises an outer top plate forming body 114 and two inner top plate forming bodies 115.

A plurality of, specifically two, recesses 118 are formed in the upper part of the joint surface 117 of each of the outer top plate forming bodies 114 with the corresponding one of the inner top plate forming bodies 115. As shown in FIG. 15, the concave portion 118 is aligned with the joint surface 117 on which the concave portion 118 is provided.
9 are buried. Each of the joining plates 119 has a through hole 120 penetrating in the plate thickness direction. In the joining surface 121 of the top plate forming body 115 on the side of the top plate forming body 114 to be joined to the inside of each top plate forming body 114, an insert 123 is provided at a position facing the through hole 120 of each joining plate 119 of the concave portion 118. Is buried. In other words, both outer top plate forming bodies 114 and respective inner top plate forming bodies 11
5 are aligned with the corresponding ones, the bolts 124 are screwed into the inserts 123 of the inner top plate forming body 115 through the through holes 120 of all the joining plates 119, so that both outer top plate forming bodies are fitted. 114 and the inner top plate forming body 115 are fixed.

In addition, as shown in FIG. 14, a concave portion 127 is formed on each of the inner top plate forming members 115 at a position above the joining surface 126 on the other top plate forming member 115 side. I have. As shown in FIG. 16, each recess 127 has a joining plate 128 corresponding to the joining surface 126 on which the recess 127 is provided.
Is buried. Each of the joining plates 128 has a through hole 129 that penetrates in the plate thickness direction. On the joining surface 126 of the two top plate forming bodies 115, the other top plate forming body 11
5 through hole 12 of each joining plate 128 of the recess 127
An insert 131 is buried at a position opposite to the insert 9. In other words, the bolts 132 are screwed into the inserts 131 of the other top plate forming body 115 through the respective through holes 129 of both the joining plates 128 in a state where the inner both top plate forming bodies 115 are aligned with each other. The top plate forming bodies 115 on both inner sides are fixed.

As shown in FIGS. 15 and 16, the inner top plate forming body 115 has a joining surface 126 to the other inner top plate forming body 115 and the outer top plate forming body 114, respectively. Seal grooves 134 on both of the joining surfaces 121
Are formed, specifically two, below the recess 127. In the seal grooves 134, seal members 135 made of, for example, annular water-swelling rubber are arranged. Note that the sealing material 135 is
4 and has a thickness protruding from the seal groove 134 by a predetermined amount (for example, about 1 mm).

As a result, the space between both outer top plate forming bodies 114 and the respective inner top plate forming bodies 115 is sealed by the upper and lower double sealing materials 135 wound around the inner top plate forming bodies 115. In other words, the space between the inner top plate forming bodies 115 is sealed by the upper and lower double sealing materials 135 wound around each.

Further, as shown in FIG. 3, each of the top plate forming bodies 114 and 115 has a through hole 13 penetrating in the axial direction.
7 are formed to penetrate in the axial direction at predetermined positions on the outer peripheral side, and concave portions 138 are formed on the upper sides of all the through holes 137, respectively. These through holes 137
Are arranged so as to be aligned with the corresponding ones of the inserts 25 of the upper ring 52 of the outer peripheral wall 12 described above, and the through-holes 1 are aligned with the inserts 25.
A long bolt (bolt) 140 is inserted into the recess 37 from the side of the recess 138, and a lower end of the long bolt 140 is screwed into a corresponding one of the insert 25, and the recess 13 of the long bolt 140 is inserted.
The top plate 14 is connected to the outer peripheral wall 12 by screwing the nut 141 to the upper end protruding in the inside 8.

In addition, each of the top plate forming bodies 114 and 115 has a recess 142 at a predetermined position on the lower surface on the outer peripheral wall 12 side. These recesses 142 accommodate the upper ends of the vertical bolts 67 protruding upward from the outer peripheral wall 12 and the nuts 72 screwed thereto.

Further, the top plate forming bodies 114 on both outer sides include:
As shown in FIG. 2, a suction pipe insertion hole 144 penetrating in the thickness direction is formed at a predetermined position, and a cylindrical base 145 is formed around the suction pipe insertion hole 144. As shown in FIG. 2 and FIG. 14, a cylindrical suction pipe insertion hole block 147 having a suction pipe insertion hole 146 formed inside is mounted on the base 145. Here, as shown in FIG.
A plurality of positioning rods 150 are protruded, and a plurality of sheath tubes 153 are buried in the lower surface portion 152 of the suction tube insertion hole block 147. When the suction tube insertion hole block 147 is mounted on the base portion 145, By fitting all of the positioning rods 150 into the corresponding sheath tubes 153, the suction tube introduction holes 144 and 146 are coaxially arranged.

Here, a base 145 is provided inside the sheath tube 153 in the radial direction of the suction tube insertion hole block 147.
Before mounting on the base unit 1, the fluid sealing material 155 is applied so as to be continuous over the entire circumference.
When placed on the base 45, the fluid sealing material 155 seals a joint portion with the base 145.

Next, the procedure for constructing the underground water storage tank 11 having the above configuration will be described below. As shown in FIG. 18, a joint plate 82 is joined to four steel ring forming bodies 78 adjacent to each other and connected by bolts 87 and nuts 88 to form an annular auxiliary ring 70 having an upper plate portion. 79
Assemble so that is placed on the upper side.

Then, if necessary, a fluid sealing material is formed at a predetermined position on the upper plate 79 of the auxiliary ring 70 outside the through hole 93 in the radial direction so as to be continuous over the entire circumference. Apply.

On the other hand, the sealing material 33 is wound around all the used side plates 16 so as to be arranged in all the seal grooves 32 on a transporting vehicle or the like. The material 33 is wound so as to be arranged in all the seal grooves 32.

As shown in FIG. 19, on the upper plate 79 of the auxiliary ring 70, two side plates 16 whose short sides are the upper surfaces 22 are located at positions facing each other on the auxiliary ring 70. By placing the temporary fixing bolts 98 at predetermined positions, passing the temporary fixing bolts 98 through the corresponding ones of the through holes 97 of the auxiliary ring 70, and screwing them into the corresponding ones of the inserts 29 of the lower surface portion 20 of the side plate 16, Auxiliary ring 70 and side plate 1
6 is temporarily bonded.

At this time, the portions arranged on the lower surface 20 of each of the two seal members 33 of the side plate 16 are positioned on both sides in the radial direction with the through holes 93 and 97 of the upper plate 79 of the auxiliary ring 70 interposed therebetween. This portion is in contact with and sealed (see FIG. 10). At the same time, the fluid sealing material applied on the upper plate 79 of the auxiliary ring 70 also seals the contact portion with the side plate 16 as necessary.

Next, as shown in FIG.
The lubricant 156 is applied to both side surfaces 21 of each of the side plates 6, and the fluid sealing material 157 is applied radially to the corners between each side surface 21 of the side plate 16 and the adjacent upper surface 22. Then, a flowable sealing material 158 is applied to the corners between each side surface 21 and the adjacent lower surface 20 in the radial direction.

In this state, the side plates 17 each having the long side as the upper surface portion 35 are fitted into the space between the existing side plates 16 from both upper sides in the radial direction. At this time, the fitting is smoothly performed by the lubricant 156. Then, as shown in FIG.
After the side plate 17 placed on the upper plate 79 of the auxiliary ring 70 in this way, the temporary fixing bolts 98 are respectively passed through the corresponding ones of the through holes 97 of the auxiliary ring 70, and then the lower surface of the side plate 17 It is temporarily connected to the auxiliary ring 70 by being screwed into a corresponding one of the inserts 29 of the portion 37.

Further, each oblique through-hole 3 of the side plate 17
9a and the oblique bolt 54a
The lower end of a is screwed into the corresponding one of the inserts 24a of the adjacent side plates 16. And, in this state, the side plate 17
The nut 56 is screwed into the upper end of each of the oblique bolts 54a protruding in the concave portion 40a.
With a torque wrench to a predetermined torque. Similarly, the oblique bolts 54b are inserted into the oblique through holes 39b of the side plates 17, respectively, and the lower ends of the oblique bolts 54b are screwed into the corresponding ones of the inserts 24b of the adjacent side plates 16. Then, in this state, nuts 56 are screwed onto the respective upper ends of all the oblique bolts 54b protruding in the concave portions 40b of the side plate 17, and the nuts 56 are tightened with a predetermined torque using a torque wrench. In this way, the lower side ring 51 is formed by connecting all of the four lower side plates 16 and 17 adjacent to each other.

In this state, the portions arranged on the lower surface portion 37 of each of the two seal members 33 of the side plate 17 are positioned radially across the through holes 93 and 97 of the upper plate 79 of the auxiliary ring 70. This contact is made on both sides to seal this part (see FIG. 10). In addition, the portion arranged on the side surface portion 36 of each of the two seal members 33 of each side plate 17 corresponds to the portion arranged on the side surface portion 21 of each of the two seal members 32 of the adjacent side plate 16. Then, the inserts 24a, 24b and the through-holes 39a, 39b are interposed therebetween so as to abut on both sides in the radial direction, and this portion is sealed (see FIG. 22). In accordance with this, the auxiliary ring 70
The fluid sealing material applied as necessary on the upper plate portion 79 also seals the contact portion with the side plate 17.

At the appropriate time up to this point, the piece members 58 are respectively inserted into all the recesses 27 of the lower ring 51.
Is attached by screwing the bolt portion 59 to a corresponding one of the insert 28.

Then, as shown in FIG. 23, the concave portion 30 is fitted to the bridge member 58 of the lower ring 51,
On the lower ring 51, two side plates 16 whose shorter sides are the upper surface portion 22 are placed on each side plate 17 of the lower ring 51, and are positioned at positions facing each other on the lower ring 51.

At this time, the two sealing materials 3 of each side plate 16 are used.
3 is arranged on the upper surface 35 of the two seal members 33 of the lower side plate 17,
Inserts 29, 25, through-holes 23 and recesses 30, 4,
Abutting is performed at positions on both sides in the radial direction with Oa, 40b, and 27 interposed therebetween, and this portion is sealed.

Next, as in the case of the lower ring 51, a lubricant 156 is applied to both side portions 21 of the side plates 16, and an upper surface portion 22 adjacent to each side portion 21 of each side plate 16 is formed. , A fluid sealant 157 is applied radially to each corner, and a fluid sealant 158 is applied radially to each corner between each side surface 21 and the adjacent lower surface 20 (FIG. 20).

In this state, as shown in FIG. 24, the long side is located on the upper surface 3 at the position between the existing side plates 16.
The side plate 17, which is assumed to be 5, is fitted from the upper side while adjusting the position in the radial direction, and the two concave portions 30 of the lower surface portion 37 are fitted to the respective piece members 58 of the lower ring 51. At this time, the fitting is smoothly performed by the lubricant.

Then, each oblique through-hole 3 of the side plate 17
9a and the oblique bolt 54a
The lower end of a is screwed into the corresponding one of the inserts 24a of the adjacent side plates 16. And, in this state, the side plate 17
The nut 56 is screwed into the upper end of each of the oblique bolts 54a protruding in the concave portion 40a.
With a torque wrench to a predetermined torque. Similarly, the oblique bolts 54b are inserted into the oblique through holes 39b of the side plates 17, respectively, and the lower ends of the oblique bolts 54b are screwed into the corresponding ones of the inserts 24b of the adjacent side plates 16. Then, in this state, nuts 56 are screwed onto the respective upper ends of all the oblique bolts 54b protruding in the concave portions 40b of the side plate 17, and the nuts 56 are tightened with a predetermined torque using a torque wrench. In this way, the upper ring 52 is formed by connecting all four adjacent side plates 16 and 17 in the upper stage.

At this time, the portions arranged on the respective side portions 21 of the two sealing members 33 of the respective side plates 16 correspond to the respective side portions 36 of the respective two sealing members 33 of the adjacent side plates 17. Inserts 24a, 24b
And abut on both sides in the radial direction with the through holes 39a and 39b interposed therebetween to seal this portion (see FIG. 22). In addition, each of the two sealing materials 3 of each side plate 17
3 are disposed on the upper surface 22 of each of the two seal members 33 of the lower side plate 16 with the inserts 25 and 29, the through-hole 23 and the recess 27, Abutment is made at both sides in the radial direction with 30 interposed therebetween, and this portion is sealed.

Next, in this state, the through holes 23 of the side plate 16 of the upper ring 52 and the through holes 23 of the side plate 17 of the lower ring 51 correspond to the through holes 23 of the side plate 17 of the upper ring 52. A vertical bolt 67 is inserted from above the upper ring 52 into the corresponding one of the through hole 23 of the side plate 16 of the lower ring 51 and the lower plate 51.
To the fixing nut 71 of the auxiliary ring 70. Then, upper surface portions 22, 35 of the upper ring 52, which are on the same plane,
Nuts 7 on the upper ends of all the vertical bolts 67 projecting from
2 are screwed together, and the nut 72 is tightened with a predetermined torque using a torque wrench. In this way, the auxiliary ring 7
0, the lower ring 51 and the upper ring 52 are integrally connected.

At this time, the lower ring 51 is formed by the fluid sealing material 158 applied when the lower ring 51 is assembled.
The gap formed by the auxiliary ring 70 and the corners of the opposite lower ends of the side surfaces 21 and 36 of both side plates 16 and 17 are all putty-filled, and are applied when the lower ring 51 is assembled. Due to the flowable sealing material 157 and the flowable sealing material 158 applied at the time of assembling the upper ring 52, the corners of the upper end portions of the side surfaces 21, 36 of the both side plates 16, 17 of the lower ring 51 are opposed to each other. The gap formed by the upper ring 52 and the upper ring 52 are all putty-filled.

Similarly, the fluid seal 157 applied at the time of assembling the upper ring 52 causes the upper ring 5
2 and the side plate 1 of the upper ring 52
All the gaps formed between the corners of the upper end portions of the side surface portions 21 and 36 facing each other are also putty-filled.

Next, FIG.
The auxiliary ring 70 and the outer peripheral wall 12 as shown in FIG. 5 are submerged in the ground by a latent box method.

That is, after the outer peripheral wall 12 on which the auxiliary ring 70 is integrated is placed on the ground of the construction site, the soil inside the auxiliary ring 70 is sequentially excavated and carried out to the outside, whereby the auxiliary ring 70 is integrated. The set outer peripheral wall 12 is lowered by its own weight and buried in the ground. At this time, the outer peripheral wall 12
Is smaller than the outer diameter of the auxiliary ring 70, the friction of the outer peripheral wall 12 with the ground can be suppressed to a small value.

As described above, the bottom slab 1 is placed on the inner side in the radial direction of the auxiliary ring 70 and the outer peripheral wall 12 submerged to a predetermined depth and on the excavated bottom of the ground formed inside.
3 is installed.

That is, as shown in FIG. 10, first, the fluid sealing material 90 is applied to the inner corner between the lower plate portion 80 and the side plate portion 81 of the auxiliary ring 70 so as to be continuous over the entire circumference. . In addition, the reinforcing bars 75 in the bottom plate 13 are arranged. On the other hand, as shown in FIG.
A pit hole 159 is dug partially as necessary to install the prefabricated pit 76, and the pit hole 15
Recycled crushed stone 160 is put into 9 and spread.

Next, the filter 11 is inserted into the pit hole 159.
A prefabricated pit 76 to which the prefabricated pit 76 is attached is inserted, and a drainage pump (not shown) is inserted thereinto, and groundwater that springs into the prefabricated pit 76 from the through-hole 102 is drawn out. Then, the reclaimed stone 160 is spread on the remaining excavated bottom.
At an appropriate time, a waterproof material 161 such as bentonite is attached to the step 108 of the prefab pit 76.

The pumping of the spring water by the drain pump is continued without interruption, and after the above-mentioned preparation work is completed, the concrete is thrown away on the crushed stone 160 (mixed concrete).
163 is cast. Then, the pumping of the spring water is continued by the drainage pump until the discarded concrete 163 is appropriately set. When the discarded concrete 163 is properly set, the bottom concrete (fresh concrete) 74 is further poured on the discarded concrete 163. Then, the upper surface is iron-finished. As a result, the bottom slab concrete 74 is filled inside the auxiliary ring 70 and also adheres to the lower part of the lower ring 51 of the outer peripheral wall 12. Then, the pumping of the spring water is continued by the drain pump until the upper surface of the bottom slab concrete 74 is appropriately condensed. When the upper surface of the bottom slab concrete 74 is appropriately condensed, the drain pump is stopped, and the spring water is condensed from the prefab pit 76. The bottom slab concrete 74 overflows onto the inside bottom slab concrete 74 to cure the bottom slab concrete 74 underwater.

During the underwater curing, the water stretched on the bottom slab concrete 74 offsets the spring water pressure below the bottom slab concrete 74. For this reason, a water supply is not formed by the spring pressure in the bottom slab concrete 74 during setting, and a water leakage defect caused by the water supply is reliably prevented. Further, since the spring water is filtered by the filter 110, the curing is not hindered by sludge or refuse.

When the strength of the bottom slab concrete 74 has reached a predetermined value, the spring water on the bottom slab concrete 74 and the spring water in the prefabricated pit 76 are pumped up by a drain pump to empty them. Then, a plug is screwed into the socket 105 to close the through hole 102, and then filled with mortar to flatten the through hole portion. If necessary, mortar is cast on the bottom surface of the prefab pit 76 to adjust the pit depth.

In this manner, the construction of the bottom slab 13 is completed. In this state, the plurality of connecting bars 104 are embedded in the bottom slab concrete 74 and integrally connected to the bottom slab concrete 74. The strength is improved, and the waterproof material 161 keeps the space between the bottom slab concrete 74 and the prefabricated pit 76 liquid-tight. Furthermore, the bottom slab concrete 74 is integrated with the reinforcing bar 75, the auxiliary ring 70, and the lower ring 51 of the outer peripheral wall 12.

Then, after further caulking is performed on the joints of the outer peripheral wall 12 as necessary, the top plate 14 is installed.

First, two seal members 135 are respectively placed on both top plate forming bodies 115 arranged on the inside of a carrier or the like.
It is wound so as to fit in each seal groove 134.

Next, as shown in FIG. 3, all of the top plate forming bodies 114 and 115 are placed at predetermined positions on the upper surface of the outer peripheral wall 12 respectively. At this time, the top plate forming body 114,
The upper end portion of the vertical bolt 67 protruding upward from the outer peripheral wall 12 and the nut 72 screwed thereto are housed in the recess 142 of the 115. At this time, all the through holes 137 of the top plate forming bodies 114 and 115 are arranged so as to be located on the same straight line as the corresponding one of the insert 25 of the outer peripheral wall 12.

Here, the joint between the outer top plate forming body 114 and the inner top plate forming body 115 is formed by the two sealing materials 1 disposed above and below the inner top plate forming body 115, respectively.
Each outer top plate forming body 114 comes into contact with 35 to be sealed (see FIG. 15). Also, the joint portions between the inner top plate forming bodies 115 are formed on both inner top plate forming bodies 1.
15 two sealing materials 13 arranged above and below
5 are brought into contact with each other to be sealed (see FIG. 1).
6).

The joint between the top plate forming bodies 114 and 115 and the outer peripheral wall 12 is formed of two seals wound around all the side plates 16 and 17 constituting the upper ring 52 of the outer peripheral wall 12 respectively. The portions located on the upper surface portion 22 and the upper surface portion 35 of the material 33 are the top plate forming body 114 and the top plate forming body 11.
5 comes into contact with the seal (see FIG. 26). In addition, if necessary, the outer peripheral wall 12 and the top plate forming body 1
A fluid sealing material is applied to joints between the first and second joints 14 and 115.

Next, as shown in FIG. 3, all the long bolts 140 are inserted into the through holes 137 of the top plate forming bodies 114 and 115, and the lower ends thereof are screwed into the inserts 25 of the outer peripheral wall 12. Then, the nut 141 is screwed into the upper end protruding in the recess 138 of the long bolt 140 and tightened. At the same time, as shown in FIG. 15, bolts 124 are screwed from all the recesses 118 of the top plate forming body 114 to the inserts 123 through the through holes 120 of the joining plate 119, and as shown in FIG. Bolts 132 are screwed into the inserts 131 from all the recesses 127 of the top plate forming body 115 through the through holes 129 of the joining plate 128. Further, as shown in FIG. 2 and FIG. 17, suction tube insertion hole blocks 147 coated with a flowable sealing material 155 are set on respective base portions 145 of the top plate forming bodies 114 on both outer sides. As described above, the top plate 14 is attached to the outer peripheral wall 12 in its shape.

Finally, the underground water storage tank 11 assembled in this way is backfilled, and the construction of the underground water storage tank 11 is completed.

In the above embodiment, the side plates 16 and 17 which are vertically overlapped with each other are connected to each other by three vertical bolts 67 and three fixing nuts 71 and three nuts 72. The case where three through holes 23 parallel to the axial direction are formed in each of the plates 16 and 17 has been described as an example, but the number is not limited to this. For example, as shown in FIG.
As shown in FIG. 8, the side plate 17 is formed with two through holes 23 along the axial direction, and one set of the side plates 16 and 17 is connected with two vertical bolts 67, two fixing nuts 71 and two nuts. Connection at 72 is also possible. In this case, the nut 72 can be fastened with a jack.

According to the above-described embodiment, a plurality of arc-shaped side plates 1 formed in a trapezoidal shape as viewed from the radial direction.
The outer peripheral wall 12 is formed by joining the peripheral parts 6 and 17 in a state in which the short sides and the long sides are adjacent to each other in the circumferential direction and the short sides and the long sides are reversed. Thus, the oblique bolts 54a, 54 inserted from above from the adjacent ones joined in this manner are inserted.
4b and a nut 56 screwed to the upper end thereof.

Therefore, instead of being connected with the outer joint plate in the radial direction, the oblique bolts 54a and 54b inserted from above and the nut 56 screwed to the upper end thereof are used to connect the side plates 16 and 17 in the circumferential direction. Can be connected to each other, so that there is no corrosion due to the influence of the ground, the durability can be improved, and the work can be done from the upper side, making construction easy Can be.

Further, since the side plates 16 and 17 adjacent to each other in the circumferential direction are connected by the inserts 24a and 24b, the oblique bolts 54a and 54b and the nut 56 which are inclined with respect to the axial direction, the inserts 24a and 24b and The angle of the oblique bolts 54a, 54b can be made closer to the connecting direction of the side plates 16, 17 adjacent in the circumferential direction.

Therefore, the side plates 16 adjacent in the circumferential direction,
17 into inserts 24a, 24b, oblique bolt 54
a, 54b and the nut 56 can be more reliably connected.

Further, a vertical bolt 6 penetrating in the axial direction is provided.
7. Since the side plates 16 and 17 adjacent to each other in the axial direction are connected by the fixing nut 71 and the nut 72, the connecting direction and the direction of the vertical bolt 67 coincide.

Therefore, the side plates 1 adjacent to each other in the axial direction are provided.
The longitudinal bolts 67, the fixing nuts 71 and the nuts 72 can more reliably connect the members 6 and 17 to each other.

In addition, the lower surface portion 20, the side surface portions 21, and the upper surface portion 22 of the side plate 16 and the side plate 1 to be joined to each of these surfaces.
Since a plurality of seal members 33 are provided in the upper surface portion 35, the both side surface portions 36, and the lower surface portion 37 in the radial direction, a joint portion can be reliably sealed.

Further, since the piece member 58 is provided in the space 64 formed by the concave portions 27 and 30 of the side plates 16 and 17 facing each other, the side plates 16 and 17 connected in the axial direction are provided.
In addition to securing the shearing force between the members 17, it is also advantageous for positioning in construction.

In addition, since the bridge member 58 can be fastened and fixed to the insert 28 embedded in the concave portion 27, the shear force between the side plates 16, 17 connected in the axial direction is more reliably secured. In addition to this, it is more advantageous for positioning in construction.

Further, since the side plates 16 and 17 are constructed on the steel auxiliary ring 70 to form the outer peripheral wall 12, the side plates 16 and 17 can be easily assembled even if they are assembled on soft ground. . In addition, since the bottom slab 13 is formed of the bottom slab concrete 74 cast so as to be integrated with the auxiliary ring 70, the connection between the bottom slab 13 and the outer peripheral wall 12 can be easily and reliably performed.

In addition, since the fluid sealing material 90 interposed between the auxiliary ring 70 and the bottom concrete 74 in the circumferential direction is provided below the auxiliary ring 70, it is possible to more reliably improve the sealing performance of this portion. it can.

Further, the side portion 2 between the side plates 16 and 17 is provided.
Fluid sealing material 15 is provided in the gaps formed at the ends of
Since putties 7 and 158 are buried, the sealing property of this portion can be more reliably improved.

[0124]

As described in detail above, claim 1 of the present invention
According to the side plate for the underground water storage tank described in the above, since it is formed in a trapezoidal shape as viewed from the radial direction, it is joined in a state where the short side and the long side are opposite to each other in the circumferential direction. Can be done. Therefore, the adjacent members joined in this manner can be connected by the connecting member inserted from above.

[0125] Therefore, the connecting members inserted from the upper side can connect the adjacent members, instead of being connected by the outer joint plate in the radial direction, so that corrosion or the like is caused by the influence of the ground. Without
Since the durability can be improved and the work can be performed from the upper side, the construction can be easily performed.

According to the underground water storage tank according to the second aspect of the present invention, a plurality of arc-shaped side plates formed in a trapezoidal shape as viewed from the radial direction are adjacent to each other in the circumferential direction, and have a short side and a short side. Since the outer peripheral wall is formed by joining the long sides to the opposite sides, the adjacent members joined in this manner can be connected by the connecting member inserted from above.

Therefore, the connecting members inserted from the upper side can connect the adjacent members, instead of being connected by the outer joint plate in the radial direction. Therefore, corrosion or the like is caused by the influence of the ground. Without
Since the durability can be improved and the work can be performed from the upper side, the construction can be easily performed.

According to the underground water storage tank according to the third aspect of the present invention, the side connecting plates that are circumferentially adjacent to each other are connected by the inclined connecting member inclined with respect to the axial direction. The angle can be closer to the connecting direction of the adjacent side plates.

Accordingly, the side plates adjacent in the circumferential direction can be more reliably connected by the inclined connecting members.

According to the underground water storage tank of the fourth aspect of the present invention, the axially connecting members penetrating in the axial direction connect the side plates adjacent in the axial direction to each other. The direction of the direction connecting member will be the same.

Therefore, the side plates adjacent in the axial direction can be more reliably connected by the connecting member in the axial direction.

According to the underground water storage tank according to the fifth aspect of the present invention, since a plurality of seal members are provided in the radial direction on the joint surface between the side plates, the seal can be surely sealed.

According to the underground water storage tank of the sixth aspect of the present invention, since the bridge member is provided in the space formed by the concave portions facing each other on the joint surface between the side plates, the shear force between the side plates is provided. Can be secured.

According to the underground water storage tank according to the seventh aspect of the present invention, since the bridge member can be fastened and fixed to the insert embedded in the concave portion, the shear force between the side plates can be more reliably secured. can do.

According to the underground water storage tank according to the eighth aspect of the present invention, since a plurality of side plates are constructed on the auxiliary ring, the side plates can be easily assembled even when assembled on soft ground. be able to. Moreover, since the bottom slab is formed of concrete cast so as to be integrated with the auxiliary ring, the bottom slab and the outer peripheral wall can be easily and reliably connected.

[0136] According to the underground water storage tank of the ninth aspect of the present invention, the sealing material interposed between the concrete and the concrete is provided in the lower part of the auxiliary ring in the circumferential direction. Can be more reliably improved.

According to the underground water storage tank according to the tenth aspect of the present invention, since the gap formed at the end of the joining surface between the side plates is putty-filled with the fluid sealing material, the sealing of this portion is achieved. Properties can be more reliably improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an underground water storage tank according to one embodiment of the present invention.

FIG. 2 is a sectional view of an underground water storage tank according to one embodiment of the present invention.

FIG. 3 is a developed sectional view of an underground water storage tank according to one embodiment of the present invention.

4A and 4B show one of the side plates for the underground water storage tank according to one embodiment of the present invention, where FIG. 4A is a front view exploded for convenience, FIG. 4B is a top view, and FIG. ) Is a bottom view, (d)
Is a left side view, and (e) is a right side view.

FIG. 5 is a partially enlarged sectional view showing a side plate for an underground water storage tank and a sealing material according to an embodiment of the present invention.

6A and 6B show the other side plate of the underground water storage tank according to one embodiment of the present invention, in which FIG. 6A is a front view exploded for convenience, FIG. 6B is a top view, and FIG. ) Is a bottom view, (d)
Is a left side view, and (e) is a right side view.

FIG. 7 is a partially enlarged cross-sectional view showing an example of a connection portion between a lower ring and an upper ring of an underground water storage tank according to one embodiment of the present invention.

FIG. 8 is a partially enlarged cross-sectional view showing another example of a connection portion between the lower ring and the upper ring of the underground water storage tank according to one embodiment of the present invention.

9A and 9B show a ring forming body of the underground water storage tank according to one embodiment of the present invention, wherein FIG. 9A is a front view, FIG. 9B is a top view, FIG. 9C is a left side view, and FIG. ) Is a right side view.

FIG. 10 is a partially enlarged sectional view of a connection portion between an auxiliary ring and a side plate of an underground water storage tank according to one embodiment of the present invention.

FIG. 11 is a plan view of a prefabricated pit of an underground water storage tank according to one embodiment of the present invention.

FIG. 12 is a cross-sectional view of a prefabricated pit of an underground water storage tank according to one embodiment of the present invention.

FIG. 13 is a partially enlarged cross-sectional view of a bottom plate of the underground water storage tank according to one embodiment of the present invention.

FIG. 14 is a plan view of an underground water storage tank according to one embodiment of the present invention.

FIG. 15 is a partially enlarged cross-sectional view of a top plate of an underground water storage tank according to one embodiment of the present invention.

FIG. 16 is a partially enlarged sectional view of a top plate of an underground water storage tank according to one embodiment of the present invention.

FIG. 17 is a partially enlarged sectional view of a top plate of an underground water storage tank according to one embodiment of the present invention.

FIG. 18 is a developed cross-sectional view showing a construction process of an underground water storage tank according to one embodiment of the present invention.

FIG. 19 is a developed cross-sectional view showing a construction process of an underground water storage tank according to one embodiment of the present invention.

FIG. 20 is a side view showing a construction process of an underground water storage tank according to one embodiment of the present invention.

FIG. 21 is a developed cross-sectional view showing a construction process of an underground water storage tank according to one embodiment of the present invention.

FIG. 22 is a partially enlarged view showing a joint portion of the side plate for the underground water storage tank according to one embodiment of the present invention.

FIG. 23 is a developed cross-sectional view showing a construction process of an underground water storage tank according to one embodiment of the present invention.

FIG. 24 is a developed cross-sectional view showing a construction process of an underground water storage tank according to one embodiment of the present invention.

FIG. 25 is a perspective view showing an auxiliary ring and an outer peripheral wall of the underground water storage tank according to one embodiment of the present invention.

FIG. 26 is a partially enlarged cross-sectional view of a joint portion between the top plate and the outer peripheral wall of the underground water storage tank according to one embodiment of the present invention.

FIG. 27 shows another example of the side plate for the underground water storage tank according to one embodiment of the present invention, wherein (a) is a front view,
(B) is a top view and (c) is a side view.

FIG. 28 shows another example of the side plate for the underground water storage tank according to one embodiment of the present invention, in which (a) is a front view,
(B) is a top view and (c) is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Underground water tank 12 Outer peripheral wall 13 Bottom plate 14 Top plate 16, 17 Side plate (side plate for underground water tank) 20, 37 Lower surface part (joining surface) 21, 36 Side part (joining surface) 22, 35 Upper part (joining) Surface) 24a, 24b Insert (inclined connecting member) 25 Insert 27 Recess 28 Insert 33 Sealing material 54a, 54b Oblique bolt (inclined connecting member) 56 Nut (inclined connecting member) 58 Piece member 67 Vertical bolt (axial direction connecting member) 70 Auxiliary ring 71 Anchoring nut (axial connection member) 72 Nut (axial connection member) 74 Bottom concrete (concrete) 75 Reinforcing bar 90 Fluid sealing material (sealing material) 140 Long bolt (bolt) 157, 158 Fluid sealing material

Claims (10)

[Claims] 1. An underground water storage tank buried in the ground, comprising an outer peripheral wall formed in a cylindrical shape, a bottom plate provided at the bottom of the outer peripheral wall, and a top plate provided at an upper portion of the outer peripheral wall. A side plate for an underground water tank having an arc shape formed by joining a plurality of the outer peripheral walls, wherein the side plate is formed in a trapezoidal shape when viewed from a radial direction. 2. An underground water storage tank having a cylindrical outer peripheral wall, a bottom plate provided at a bottom portion of the outer peripheral wall, and a top plate provided at an upper portion of the outer peripheral wall and buried in the ground. The outer peripheral wall has a plurality of arc-shaped side plates formed in a trapezoidal shape as viewed from the radial direction, with the short side and the long side being opposite to each other in the circumferential direction. An underground water tank characterized by being joined. 3. The underground water storage tank according to claim 2, wherein the side plates adjacent in the circumferential direction are connected by an inclined connecting member that is inclined with respect to the axial direction. 4. The outer peripheral wall, wherein a plurality of the side plates are overlapped also in the axial direction, and the side plates adjacent in the axial direction are connected by an axial connecting member penetrating in the axial direction. The underground water storage tank according to claim 2 or 3, wherein: 5. The underground water storage tank according to claim 2, wherein a plurality of sealing members are provided in a radial direction on a joint surface between the side plates. 6. The method according to claim 2, wherein concave portions facing each other are formed in a joining surface of the side plates, and a bridge member is provided in a space formed by the concave portions. An underground water storage tank according to any one of the preceding claims. 7. The underground water storage tank according to claim 6, wherein the piece member can be fastened and fixed to an insert embedded in the recess. 8. An auxiliary ring is provided at a lower end of the outer peripheral wall, and the bottom slab is formed of concrete cast integrally with the auxiliary ring. An underground water storage tank according to any one of claims 1 to 7. 9. The underground water storage tank according to claim 8, wherein a sealant interposed between the auxiliary ring and the concrete is provided in a lower part of the auxiliary ring. 10. The underground according to any one of claims 2 to 9, wherein a flowable sealing material is putty-filled in a gap formed at an end of a joining surface between the side plates. Water storage tank.