JPH09125473A - Water storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large capacity of water storage tank at low cost without increased structure in scale nor further sophistication. SOLUTION: The center of a peripheral wall 21 formed in cylinder shape is provided with a core member 2 which connects an upper shell 4 formed in defective spherical shape to a lower shell 5 with a tension member 6, which comprises a cross section-T-shaped steel material. Cylinder members 7 and 8 are mounted on the outer periphery of the upper shell 4 and the lower shell 5. A plurality of H-section reinforcing steel materials 33 and 37 are provided in a radial manner between the inner peripheral surface of the peripheral wall 21 and the outer peripheral surfaces of the cylinder members 7 and 8. Concrete is cast on the bottom, thereby constructing a bottom slab 22 which comprises a concrete slab provided with the reinforcing steel 33. A bonding board 38 is provided on the bottom side of the upper reinforcing steel 33 while concrete is cast on the top of the molding board 38, thereby constructing a top board 23 made of a concrete slab provided with the reinforcing steel 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water tank for storing sufficient drinking water in the event of an earthquake or the like.

[0002]

2. Description of the Related Art In recent years, it has been required to secure a sufficient amount of drinking water in the event of an earthquake. Therefore, a large cylindrical water tank that stores a large amount of tap water is buried underground in a park,
Ensuring drinking water is in place.

[0003]

By the way, when the size of the water tank is increased as described above, it is necessary to secure the strength enough to withstand the water pressure of the stored water, and the peripheral wall of the water tank, the bottom plate and the ceiling plate. There was a problem that the plate had to be made sufficiently thick, a large amount of reinforcing bars and concrete were forced to be used, and it became an extremely large-scale and high-cost water tank.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a large-scale water storage tank at a low cost which has a simplified structure and ensures sufficient strength.

[0005]

In order to achieve the above object, a water tank according to claim 1 is a water tank to be buried underground, and has a cylindrical peripheral wall and a bottom portion of the peripheral wall. A bottom plate provided on the top plate, and a top plate provided on the upper part of the peripheral wall,
It is characterized by comprising a core portion provided at the center and connecting the bottom plate and the top plate. According to a second aspect of the present invention, there is provided the water reservoir according to the first aspect, wherein the core portion has a pair of shells formed in a spherical shape, and the shells are circumferentially spaced from each other. The bottom plate and the top plate are connected to the shell, respectively.

According to a third aspect of the present invention, in the water reservoir according to the second aspect, the bottom plate and the top plate are fixed to an outer peripheral surface of a shell forming the core portion and an inner peripheral surface of the peripheral wall. It is characterized by comprising a concrete slab in which a plurality of reinforcing steels radially supported on the outer periphery of the core portion are arranged.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a water storage tank of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 is a large water tank. The water storage tank 1 is composed of a core portion 2 provided at the center and a cylindrical portion 3 on the outer peripheral side of the core portion 2. The core part 2 is, as shown in FIG.
Each has an upper shell 4 and a lower shell 5 which are formed in a truncated spherical shape, and the upper shell 4 and the lower shell 5 are vertically connected by a plurality of tension members 6. These tension members 6 are made of steel material having a T-shaped cross section,
Both ends of each are firmly fixed to the upper shell 4 and the lower shell 5 by welding. The tension member 6 is not limited to the T-shaped cross section, and may be H steel or the like.

Cylindrical members 7 and 8 are fixed to the upper shell 4 and the lower shell 5 constituting the core portion 2 by welding or the like on the outer peripheral sides of the upper shell 4 and the lower shell 5, respectively. A lid 10 having a plurality of manholes 9 is attached to the upper portion of the lid 7. Further, the upper shell 4 is provided with a doorway 12 provided with a lid 11 at a position off the center.
A ladder 13 is attached below the upper shell 4 between the upper shell 4 and the lower shell 5. Further, a plurality of valves 14 are attached to the upper shell 4, and these valves 14 are
A water pipe (not shown) buried in the ground is connected. Further, one of the valves 14 to which the water pipes are connected is adapted to be fed with tap water from the water pipes, and is branched from the valve 14 below and in the middle of the core portion 2 to form the cylindrical portion 3 By the water pipe 15 extending downward of
It is designed to flow into the water tank 1.

Further, the water in the water tank 1 is sent to the water pipe from the other valve 14 to which the water pipe is connected. The other valve 14 is used as an exhaust valve. In addition, the cylindrical portion 3 includes a cylindrical peripheral wall 21 and a bottom plate 22 formed on the lower end side of the peripheral wall 21.
And a top plate 23 constructed on the upper end side of the peripheral wall 21. The peripheral wall 21 of the cylindrical portion 3 is formed by connecting steel plates in the circumferential direction, and the joint portion is fastened by a high tension bolt 24 and a nut 25 as shown in FIG. Furthermore, the watertightness may be improved by welding the ends of the steel plate. A cover 26 is attached to the outer peripheral side of the joint portion by welding to cover a fastening portion with the high tension bolt 24, and mortar 27 is injected into the portion covered by the cover 26. The inner surface of the peripheral wall 21 is coated with epoxy, and the outer surface of the peripheral wall 21 is treated with cathodic protection or a concrete liner.

The bottom slab 22 is constructed on waste concrete 32 cast on a split chestnut 31 laid on the ground, and is attached to the inner peripheral surface of the peripheral wall 21 and the lower end of the core portion 2. The H steel that is radially arranged at intervals in the circumferential direction between the cylindrical member 8 and each end is securely fixed to the inner peripheral surface of the peripheral wall 21 and the outer peripheral surface of the cylindrical member 8 by welding. It is composed of a concrete slab containing a plurality of reinforcing bars 33. Also, this bottom plate 22
As shown in FIG. 6, a coating layer 34 formed by coating with a dense and tough coating film is provided on the upper surface side of the sheet to be waterproofed. Grooves 35 are formed at the inner peripheral side and the outer peripheral side of the bottom slab 22 on the upper surface side. The groove 35 is filled with a sealing material 36 so that a boundary surface between the bottom slab 22 and the peripheral wall 21 is formed. Dealing with water stoppage.

Further, like the bottom plate 22, the top plate 23 is provided with a plurality of reinforcing steels 37 made of H steel radially arranged at intervals in the circumferential direction, and each of the reinforcing steels 37 is also provided. The end portions of are welded to the inner peripheral surface of the peripheral wall 21 and the outer peripheral surface of the cylindrical member 7 to be securely fixed. Further, a form plate 38 is provided on the lower surface side of the reinforcing steels 37, and concrete is cast on a portion including the reinforcing steel 37 on the upper surface side of the form plate 38 to form a ceiling plate made of concrete. It is said to be edition 23.

Next, the work for constructing the water storage tank 1 having the above-mentioned structure will be described according to the procedure. (1) First, a peripheral wall 21 that constitutes the cylindrical portion 3 is constructed, and the peripheral wall 21 is embedded in the ground by a submersible method. That is,
The ground inside and below the peripheral wall 21 is excavated and dug down to a predetermined depth. (2) Then, split chestnuts 31 are spread over the bottom of the peripheral wall 21, and discarded concrete 32 is poured. (3) In this state, in a factory or the like, the upper shell 4 and the lower shell 5 are connected in advance by the tension member 6, and the cylindrical members 7 and 8 are attached to the upper shell 4 and the lower shell 5, respectively.
Further, the core portion 2 to which the ladder 13, the introduction pipe 15, the running water pipe 16 and the like are attached is arranged at the center.

(4) Then, reinforcing steels 33 are radially arranged between the cylindrical member 8 of the lower shell 5 of the core portion 2 and the peripheral wall 21, and the ends of the reinforcing steels 33 are welded and fixed. Concrete is cast on the bottom portion including the steel 33 and cured and cured to complete the bottom plate 22. (5) Thereafter, between the cylindrical member 7 attached to the upper shell 4 of the core portion 2 and the peripheral wall 21, the reinforcing steel 37 for the top plate is radially installed by welding and fixing its end portion.

(6) A form plate 38 is attached to the lower surface of the reinforcing steel 37 installed radially, and the upper face of the form plate 38 is
Concrete is poured so as to fill the reinforcing steel 37 and cured and cured to construct the top 23. (7) The bottom plate 22 and the top plate 23 are provided with waterproof coating on the inner surfaces thereof, and further, the inner peripheral surface of the peripheral wall 21 is coated with epoxy resin, and then the groove portions formed on the upper surface edges of the inner peripheral side and the outer peripheral side of the bottom plate 22. 35 is filled with the sealing material 36. (8) After that, the water pipe and the valve 14 are connected, the lid 10 is attached to the upper part of the cylindrical member 7 of the upper shell 4, and the water tank 1
Back up the top side of the.

When tap water is sent to the water tank 1 constructed in this way, the tap water is introduced into the introduction pipe 15
Is discharged from the bottom of the core portion 2 and the bottom of the cylindrical portion 3 to be collected, and is sent out from the running water pipe 16 to the water pipe, whereby water is constantly circulated in the water tank 1 and a fresh state is secured. . If the water pipe ruptures due to the earthquake and the supply of drinking water to each home is interrupted, the valve 14 of the water storage tank 1 is closed and the water in the water storage tank 1 is stored.

As described above, according to the large-capacity water storage tank capable of securing sufficient drinking water even in the event of an earthquake, the core portion 2 which is vertically connected by the tension member 6 is provided at the center. Therefore, even if a large amount of the stored water pressure acts on the peripheral wall 21 and the bottom slab 22, the core portion 2 significantly increases the rigidity of the whole, so that it is possible to sufficiently withstand this large water pressure. it can. As a result, it is possible to eliminate the need for a large-scale reinforcement structure, and it is possible to reduce costs and shorten the construction period.

Further, the lower shell 5 which constitutes the central core portion 2
Since it is formed in a spheroidal shape, water pressure can be evenly applied to this lower shell 5. That is, it is possible to provide the water storage tank 1 in which cracks and the like due to the water pressure applied to a part thereof are not generated. Further, since the core portion 2 can be assembled in advance in a factory or the like, the work at the site can be simplified and the construction period can be further shortened.

In the water storage tank 1 described above, the cylindrical members 7 and 8 are attached around the upper shell 4 and the lower shell 5 which form the core portion 2. However, the cylindrical members 7 and 8 are not provided and are reinforced. The steels 37 and 33 may be directly fixed to the peripheral surfaces of the upper shell 4 and the lower shell 5. Further, in the one shown in FIG. 7, the peripheral wall 21 is composed of an outer cylinder 41 and an inner cylinder 42.
The inner cylinder 4 is made by placing concrete 43 between 2 and
A plurality of rod-shaped dowels 44 are provided on the outer peripheral surface of 2 in order to secure a space between the outer cylinder 41 and the inner cylinder 42. Further, the joints of the inner cylinder 42 are connected by a backing plate 47 fastened and fixed by high tension bolts 45 and nuts 46 on both sides. According to the water tank having the peripheral wall 21 of this structure, the strength of the peripheral wall 21 can be improved and the rust preventive effect of the inner cylinder 42 can be obtained by the concrete 43, and further, the peripheral wall 21 can be deposited by the submersible method. It will also be a toy for you. Further, according to the peripheral wall 21 of this structure, it is possible to perform a construction method in which the vertical shaft is dug down to install the outer cylinder 41 and then the inner cylinder 42 is installed and the concrete 43 is filled by the deep foundation method. , Is likely to occur in the submersible method,
It is possible to prevent the assembly from tilting during construction.

[0019]

As described above, according to the water storage tank of the present invention, the following effects can be obtained. According to the water storage tank of the first aspect, the rigidity of the water storage tank can be significantly improved by the core portion provided at the center. As a result, even a large-capacity water storage tank can have a structure that can sufficiently withstand the water pressure of a large amount of stored water. Therefore,
It is possible to eliminate the need for a large-scale reinforcement structure, reduce costs, and shorten the construction period. According to the water storage tank of the second aspect, since the shell forming the central core portion is formed in the shape of an eclipse, water pressure can be uniformly applied to the shell. That is, it is possible to provide a water storage tank in which cracks and the like due to partial pressure of water are not generated. Also,
Since the core part can be assembled in advance in a factory or the like, it is possible to simplify the work at the site,
The construction period can be further shortened.

According to the water storage tank of the third aspect, the top and bottom slabs are laid with a plurality of reinforcing steels radially between the outer periphery of the core portion and the inner periphery of the peripheral wall, and concrete is poured. Since the structure is extremely simplified, the labor required for constructing the top plate and the bottom plate can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional perspective view of a water storage tank illustrating the configuration and structure of the water storage tank according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a water storage tank illustrating the configuration and structure of the water storage tank according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a water storage tank illustrating the configuration and structure of the water storage tank according to the embodiment of the present invention.

FIG. 4 is an exploded perspective view of the core portion for explaining the structure of the core portion that constitutes the water storage tank according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a joint portion for explaining the joint structure of the peripheral walls which form the water storage tank according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view of a bottom slab illustrating a sealing structure in the bottom slab that constitutes the water storage tank according to the embodiment of the present invention.

FIG. 7 is a sectional view of a peripheral wall for explaining another example of the peripheral wall that constitutes the water storage tank according to the embodiment of the present invention.

[Explanation of symbols]

 1 water tank 2 core part 4 upper shell (shell) 5 lower shell (shell) 6 tensile member 21 peripheral wall 22 bottom plate 23 top plate 33, 37 reinforced steel

Claims (3)

[Claims] 1. A water tank to be buried underground, which has a cylindrical peripheral wall, a bottom plate provided at the bottom of the peripheral wall, and a ceiling plate provided at an upper portion of the peripheral wall. A water tank provided with a core part that connects the bottom plate and the top plate. 2. The core portion is composed of a pair of shells formed in a spheroidal shape, and tension members provided at intervals in the circumferential direction between the shells. The water tank according to claim 1, wherein each of the top plates is connected to the shell. 3. The plurality of reinforcements, wherein the bottom slab and the top plate are fixed to an outer peripheral surface of a shell forming the core portion and an inner peripheral surface of the peripheral wall and are radially supported on the outer periphery of the core portion. The water tank according to claim 2, wherein the water tank comprises a concrete slab provided with steel.