JP2002070090A - Aggregated underground tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aggregated underground tank which dispenses with complicated structure and large-scale work in the construction site, and requires only a small installation area. SOLUTION: The aggregated underground tank is constructed by burying a plurality of longitudinal tanks 1, 2, and 3 at a midpoint of a water service pipe line, and for use as a part of the water service pipe line under normal conditions while for use as an emergency water storage tank when a disaster occurs. The aggregated underground tank is formed of the tanks 1, 2, and 3, inflow ports 19, 29, and 39 formed in upper portions of the respective tanks, outflow ports 21, 31, and 41 formed in lower portions of the respective tanks, connecting pipes 23 and 27 connecting the outflow port 21 of the tank on the upstream side and the inflow port 29 of the tank on the downstream side to each other, and connecting pipes 33 and 37 connecting the outflow port 31 of the tank on the downstream side and the inflow port 39 of the tank on the upstream side to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collective underground tank which is installed in a water pipe and used as a water tank for disaster countermeasures.

[0002]

2. Description of the Related Art If water pipes are damaged at many places due to an earthquake or the like, there is a possibility that water supply over a wide area becomes impossible. Therefore, in such a case, as a means to secure emergency water, a water tank is installed in the middle of the water pipe, and this water tank is used as a part of the water pipe in normal times, and in the case of emergency, There is known a water tank for disaster countermeasures in which water is pumped up from the water tank to secure the water. One of the conditions of this water tank for disaster countermeasures is that it is necessary to supply sanitary water in an emergency, so that there is no stagnant water inside the tank when it is used as a normal water pipe. Is required. As one in which such stagnant water does not occur, for example, there is a water tank for disaster countermeasures disclosed in Japanese Utility Model Laid-Open No. 3-126894.

FIG. 3 is a longitudinal sectional view of a water tank for disaster prevention disclosed in the publication. As shown in FIG. 3, the water tank for disaster countermeasures disclosed in the above publication has a cylindrical shape with end plates installed at both ends, and the base plate 5
4 and an inflow pipe 52 and an outflow pipe 5 in a water tank 51 for the purpose of preventing a stagnation area from being generated inside the water tank.
3 are provided.

[0004] A specific embodiment will be described in detail. Discharge portions 7 are provided at both ends of an inflow pipe 52 disposed horizontally in an upper portion of a water storage tank 51.
1 is suspended along both ends 61 of the water storage tank 51.
A slit 71a is formed on the end plate side of the discharge portion 71 so as to gradually spread downward along the vertical direction.
Further, the discharge portion 81 of the outflow pipe 53 is hung down at the center in the horizontal direction of the water storage tank 51, and the suction portion 81 is provided with a plurality of slits 81a which sequentially spread downward along the vertical direction.

[0005] In the water tank for disaster countermeasures constructed as described above, in normal times, water passes through the emergency shut-off valve 72 and enters the inflow pipe 52, and the slit 71 a of the discharge portion 71.
From the reservoir tank 51. The water flows along the head and side plates of the water tank 51 and collects at the center of the water tank. At the center, the slit 81 a of the suction part 81 sucks water and flows out through the outflow pipe 53 and the emergency shutoff valve 82. Since the slit 71a of the discharge portion 71 and the slit 81a of the suction portion 81 are tapered so as to expand downward, the flow velocity distribution of water in the vertical direction in the water storage tank 51 becomes uniform, and the inside of the water storage tank 51 There is no portion where water stays for a long time, and sanitary water is secured. In an emergency such as an earthquake, the emergency shutoff valves 72 and 82
Automatically closes to cut off incoming and outgoing air. And
The water stored in the water storage tank 51 is sent and distributed from the water supply pit 55 to the outside.

[0006]

However, the above-mentioned conventional water tank for disaster countermeasures has the following problems due to its horizontally long cylindrical shape. First, since it is horizontally long, some measure is required to prevent stagnant water from occurring. In the above example, the inflow pipe 52,
Discharge portions 71 and 81 are provided in the outflow pipe 53, and slits 71a and 81a are formed in the discharge portions 71 and 81, respectively.
However, there is a problem that the structure is complicated.

In the case where a tank is divided into several slices and integrated at a place where the tank is manufactured, transported, and installed, the maximum diameter is 3.5 due to regulations in the Road Traffic Law.
m or less, the trunk length becomes longer. For reference, Table 1 shows the lengths of the three types of tanks (40 m ³ , 60 m ³ , and 100 m ³ ) when the body diameters are φ2.5 m and φ3.0 m.

[0008]

[Table 1]

[0009] As shown in Table 1, in the case of a capacity of 100 m ³ and a body diameter of φ2.5 m, the body length is as large as 20.5 m. It is necessary to provide several retaining girder members to support the surrounding ground. And when installing the tank,
Since the tank is carried into the hole while avoiding the beam material and installed, the body of the tank is usually divided into three or four parts and carried in, and integrated after welding and installation by welding or bolting. In this way, integration work is required after loading and installation, which not only prolongs the on-site construction work, but also makes the inside of the tank dirty by on-site installation (joining) work. There is a problem that it requires cleaning work inside the tank and consumes water. In addition, land for tank installation for landscape
There is also a problem that the occupied area is large.

[0010] The present invention has been made to solve the above problems, does not require a complicated structure, does not require a large-scale joining work on site, and further eliminates the need to clean the tank in the site. The purpose of the present invention is to provide a collectable underground tank which can be installed in a small space.

[0011]

The collective underground tank according to the present invention has a plurality of vertical tanks buried in the middle of a water pipe and is used as a part of the water pipe in normal times. It is used as a water storage tank for countermeasures, and is provided at the inlet provided at the upper part of each tank, the outlet provided at the lower part of each tank, and the outlet and the downstream of the tank installed at the upstream side And a connection pipe connecting the inflow port of the tank.

Further, a displacement absorbing means is interposed in the connecting pipe.

[0013]

FIG. 1 is a side view of an embodiment of the present invention. In this embodiment, three vertical cylindrical tanks are arranged side by side in a row, and each tank is connected by a connecting pipe. The first tank 1 is connected to the most upstream side, and is connected to the most downstream side. A third tank 3 and a second tank 2 installed between the first tank 1 and the third tank 3.

The first tank 1 is a cylindrical tank in which head plates 5 and 7 are provided on the upper and lower sides, and a leg 9 for supporting the tank is provided on the lower end plate 5. Is fixed to a base concrete 11 serving as a base. In addition, the end plate 7 on the upper end side of the first tank 1 is provided with a work inspection port 13 for a worker to enter and exit. The inspection port 13 is provided with an air valve 15 for venting air. Furthermore, a cylindrical member 1 for preventing the inspection opening 13 from being buried in the soil when the tank is buried underground.
7 are installed. The structure described above is common to the second tank and the third tank, and the same reference numerals are given to the second and third tanks in the drawing.

An inflow port 19 connected to a water pipe is provided in the upper part of the peripheral body of the first tank 1. An outlet 21 is provided at the lower end, and a connection pipe 23 is provided at the outlet 21. The connecting pipe 23 is connected to the second tank 2 via a bellows-type telescopic pipe 25 and a connecting pipe 27 as displacement absorbing means.
Is connected to the inflow port 29 provided at the upper part of the. Second
An outlet 31 is provided at the lower part of the tank 2, and a connection pipe 33 is connected to the outlet 31. 3 is connected to an inflow port 39 provided at the upper part. Between the connecting pipe 23 and the connecting pipe 27, and the connecting pipe 3
Telescopic tube 25 as a displacement absorbing means between
35, the connecting pipes 23, 2
Displacements due to expansion, contraction, and the like due to temperature changes of 7, 33, and 37 are absorbed. In addition, it is possible to absorb a positional shift between the connection pipes due to a positional shift of the tank due to an earthquake or the like, thereby preventing deformation and breakage of the connection pipe. An outlet 41 is formed in a lower part of the third tank 3, and a pipe of a water pipe is connected to the outlet 41.

The third tank 3 has four drain pipes 43, 45, 47, 49 for discharging water in the tank in an emergency.
Is installed. These four drain pipes 43, 45, 4
Reference numerals 7 and 49 are inserted into the tank from the upper part of the peripheral body and extend to the lower end of the tank. These four drain pipes 43, 4
A water tap 51 is provided at two ends of 5, 47 and 49, and a fire hydrant 53 is provided at the other two ends. In addition,
The upper ends of these four drain pipes 43, 45, 47, 49 are arranged in a tubular member 55 so that inspection is possible underground.

Next, the operation of the collective underground tank configured as described above will be described. Under normal conditions, these three tanks are used as part of a water pipe .
That is, the water flowing from the inlet 19 of the first tank 1 flows through the outlet 41 of the third tank 3 via the second tank 2.
Spill out of. At this time, the inlets 19, 2 of each tank
9 and 39 are located at the upper part of the tank, and the outlets 21, 31, 41
Is located at the lower part of the tank, so that in each tank, the inflow water enters the upper part of the tank and the water at the lower part of the tank flows out sequentially. Therefore, stagnant water does not occur in the tank. This is due to the action of gravity because it is a vertical tank, and does not require any complicated mechanism for preventing generation of stagnant water as in the conventional example.

In the event of an emergency such as a disaster such as an earthquake, when the water pipe is cut and normal supply of tap water becomes impossible, the inlet 19 of the first tank, the flow of the third tank The outlet 41 is closed (a valve (not shown) or the like is closed) to prevent polluted water from flowing into the tank. Then, a temporary pump or the like is connected to a water tap 51 provided on the third tank 3 side to supply water in the tank as needed.

Next, an installation procedure of the collective tank configured as described above will be described. First, a hole for burying the tank is excavated. At this time, since the tank is a vertical type, the excavation area may be smaller than that of the horizontal type shown in the conventional example. After excavating the hole, leveling concrete 57 is cast and base concrete 11 is further cast. After the base concrete 11 is solidified, each tank is sequentially loaded and installed at a predetermined position. After tank installation, the tanks are connected to each other.

As described above, in the present embodiment, when installing the tanks, only the connections between the tanks are made, and a large-scale work such as an integration work by welding or the like as in the conventional example becomes unnecessary. The construction period can be shortened.

In the above-described embodiment, an example is shown in which three tanks are arranged side by side in a row, but as shown in the plan view of FIG. 2, the three tanks are positioned at the vertices of a triangle. It may be arranged. As described above, since a plurality of tanks are connected to form a collective tank, the arrangement can be freely changed according to the situation of the land where the tank is installed.

Further, in the above-described embodiment, an example in which three tanks are provided has been described. However, the present invention is not limited to this, and two or four or more tanks may be provided. Further, the size of each tank does not need to be the same, and tanks of various sizes can be combined according to the required storage amount.

In the above embodiment, the second
Although the positions of the inflow ports 29 and 39 of the tank 2 and the third tank 3 are provided at the top of each tank, the present invention is not limited to this, and it is sufficient if it is at the top of each tank. further,
In the above-described embodiment, the example of the telescopic pipe is shown as the displacement absorbing means provided in the middle of the connecting pipe. However, a flexible pipe or a hose may be used. Any material that can absorb the displacement can be used.

[0024]

As described above, in the present invention, a plurality of vertical tanks are installed in the middle of a water pipe, and an inlet is provided at an upper part of each tank, and an outlet is provided at a lower part of each tank. , Because the outlet of the tank installed on the upstream side is connected to the inlet of the tank located on the downstream side, stagnant water does not occur without a complicated configuration, and extensive joint work on site Is also unnecessary. Furthermore, since it is a vertical tank, the installation area may be small.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a plan view of one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional water tank for disaster countermeasures.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st tank 2 2nd tank 3 3rd tank 19,29,39 Inlet 21,31,41 Outlet 23,27,33,37 Connecting pipe 25,35 Telescopic pipe

Claims (2)

[Claims] 1. A collective underground tank in which a plurality of vertical tanks are buried in the middle of a water pipe and used as a part of the water pipe in normal times, and used as a water tank for disaster countermeasures in the event of a disaster. An inlet provided at the upper part of each tank, an outlet provided at the lower part of each tank, a connecting pipe connecting the outlet of the tank installed on the upstream side and the inlet of the tank arranged on the downstream side, A collective underground tank comprising: 2. The collective underground tank according to claim 1, wherein a displacement absorbing means is provided in the middle of the connecting pipe.