JPH09144079A - Water tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water tank of a large capacity without any large scale and complication of structure. SOLUTION: A water tank 1 is constituted of a bottom base 2 and a water storage tank part 3. The water tank part 3 is constituted of cross section semi- circular side walls constituted of a plurality of bent arc-like segments 4 and panel parts 6 provided on the end faces of the side walls 5. The segments 4 constituting the side walls 5 are left and right alternately disposed, and joint flange parts 4a themselves formed in one end part of the respective segments 4 are tightened by bolts, nuts or the like an fixed on respective top end parts. Anchor flange parts 4b formed at the other end parts of the segments 4 are fixed on the bottom base 2 by anchors 7. PC steel material 10 is longitudinally disposed on the segments 4, and the PC steel material 10 longitudinally introduces a prestressed state.

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 or the like to secure drinking water.

[0003]

By the way, when the size of the water storage tank is increased as described above, it is necessary to secure the strength enough to withstand the water pressure of the stored water.
The bottom plate and the top plate must be thick enough, and a large amount of reinforcing bars and concrete must be used.
There is a problem that it becomes a very large-scale and high-cost water storage tank. Further, since it is a cylindrical type, there is a problem that waste is generated in an installation place such as a park which is usually rectangular in a plan view.

The present invention has been made in view of the above circumstances, and provides a large-sized water storage tank which can be effectively used at the installation site, has a simplified structure, and has sufficient strength and is low in cost. The purpose is to do.

[0005]

In order to achieve the above-mentioned object, the water tank according to claim 1 is a water tank which is buried underground, and a bottom slab provided at the bottom of the excavated ground and an arc. Side walls having a semicircular cross section formed on the bottom slab by connecting one ends of a plurality of plate-shaped segments to each other and connecting them in the longitudinal direction, and arranged at both ends of the side walls. And a panel. According to a second aspect of the present invention, there is provided the water tank according to the first aspect, wherein a PC steel material is disposed on a side wall of the segment in the longitudinal direction, and the PC steel material prestresses each segment. Has been introduced.

[0006]

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. In FIGS. 1 to 4, reference numeral 1 is a water storage tank that is embedded in parallel with the ground. These water storage tanks 1 are composed of a bottom plate 2 and a water tank portion 3 placed on the bottom plate 2. The water storage tank portion 3 is composed of a side wall 5 having a semicircular cross section, which is composed of a plurality of curved arc plate-shaped segments 4, and a panel portion 6 provided on an end surface of the side wall 5. The segments 4 constituting the side wall 5 are arranged in the left-right staggered manner in the longitudinal direction, and the joint flange portions 4a formed at one end portion of each segment 4 at the top end portions are mutually connected by bolts and nuts or the like. Fastened and fixed. Anchor flange portions 4b are formed at the other ends of the segments 4, and the anchor flange portions 4b are fixed to the bottom plate 2 by anchors 7. The width of one of the left and right sides of the segment 4 disposed at the end is wider than that of the other segments 4 (1.5 times).
Segment 4'is used. It should be noted that the segment 4 having a normal width and the segment having a width half that of the segment 4 may be used in combination. Further, a PC steel material 10 is arranged in the longitudinal direction of each of these segments 4, and prestress is introduced in the longitudinal direction by these PC steel materials 10.

The panel portion 6 provided on the end face of the water tank body 3 is composed of a plurality of panels 11 each having a flange portion 11a on the side thereof.
The flange portions 11a are joined together by bolts and nuts. Further, a panel 11 having a ladder 12 provided on the inner surface side is attached in the opposite direction to the central portion of the panel portion 6 constituted by these panels 11. Then, the flange portion 11a of the panel 11 arranged in the center and the flange portion 11a of the other adjacent panel 11 are fastened and fixed by bolts and nuts or the like. A manhole 13 is provided at an upper end portion of the panel 11 provided at the central portion.

Next, the work for constructing the water storage tank 1 having the above-mentioned structure will be described according to the procedure. (1) First, excavate the ground where the water tank 1 is installed,
It is dug down to a predetermined depth and the surrounding area is reinforced by the earth retaining wall 21. (2) Next, a crushed stone is laid on the bottom of the excavated hole, and the discarded concrete 22 is placed. (3) The bottom slab 2 is constructed by installing a formwork and placing concrete on the upper surface of the discarded concrete 22. (4) Thereafter, the segments 4 are arranged on the bottom plate 2 in the longitudinal direction while joining the connecting flange portions 4a on one end side of the segments 4 with bolts and nuts or the like.

(5) Further, the anchor flange portion 4B lost on the other end side of the segment 4 is fixed to the bottom plate 2 by the anchor 7. (6) Next, the panel portions 6 having the panels 11 arranged and joined are attached to both side portions of the side wall 5 formed by the segments 4, and the water tank body 3 is assembled. (7) Then, in the longitudinal direction of the water tank body 3, P
The C steel material 10 is arranged, and the side wall 5 is formed by the PC steel material 10.
The prestress is introduced in the longitudinal direction into the segments 4 constituting the above to integrate them, and the water tank 1 is completed and backfilled. Water blocking at joints between the members is performed by a rubber gasket, resin injection, or a combination thereof.

By performing the above work, it is possible to easily construct a large-capacity water storage tank 1 capable of securing sufficient drinking water even in the event of an earthquake. Further, since it can be installed in a rectangular installation place in plan view, it is possible to effectively use an installation place such as a park in rectangular view in plan as compared with a cylindrical water tank. Further, since the segment 4 forming the side wall 5 is formed in an arcuate plate shape, the water pressure from the water stored therein acts evenly, so that the side wall 5 is damaged due to a partial large water pressure. It is possible to prevent the above, and to reduce the thickness of each member. Further, since the earth pressure acts on the outer periphery of the side wall 5 formed of the curved segment 4, it is possible to secure sufficient durability against the water pressure from the stored water. further,
The size of the water storage tank 1 can be adjusted by increasing or decreasing the number of joints of the segments 4 according to the size of the installation place. Further, since the prestress is introduced into the segments 4 by the PC steel material 10 arranged in the longitudinal direction of the side wall 5 including the segments 4, it is possible to secure a strong connected state between the segments 4.

In the above example, the two water tanks 1 are installed in parallel, but the number of the water tanks 1 to be installed is not limited to the above example, and the area of the installation place or the amount of water to be stored is not limited. Of course, it can be changed according to.

[0012]

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 claim 1, since the water storage tank can be installed in a rectangular installation place in a plan view, it is possible to effectively use an installation place such as a park in a rectangular view in plan as compared with a cylindrical water storage tank. it can.
Further, since the segments constituting the side wall are formed in an arcuate plate shape, the water pressure from the water stored inside acts evenly, so that the side wall is prevented from being damaged due to a large water pressure acting locally. It is possible to reduce the thickness of each member. Further, since the earth pressure acts on the outer circumference of the side wall formed of the curved segment, it is possible to secure sufficient durability against the water pressure from the stored water. Further, the size of the water tank can be adjusted by increasing or decreasing the number of segments to be joined according to the size of the installation location.

According to the water storage tank of the second aspect, the prestress is introduced into the segments by the PC steel material arranged in the longitudinal direction of the side wall of the segments, so that the segments are firmly connected to each other. Can be secured.

[Brief description of the drawings]

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

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

FIG. 4 is a plan cross-sectional view of a part of the water storage tank for explaining the configuration and structure of the water storage tank according to the embodiment of the present invention.

[Explanation of symbols]

 1 Water tank 2 Bottom plate 4 Segment 5 Side wall 6 Panel part 10 PC steel

Claims (2)

[Claims] 1. A water tank to be buried underground, wherein a bottom slab provided at the bottom of an excavated ground and one end of a plurality of arcuate segments are connected to each other, and the longitudinal direction A water tank comprising: a side wall having a semicircular cross section formed on the bottom slab by being connected to the bottom slab and panels disposed at both ends of the side wall. 2. The PC steel material is arranged in the longitudinal direction on the side wall formed of the segments, and the prestress is introduced into each segment by the PC steel material. Water storage tank.