JP2015232243A - Earthquake-resistant water storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use storage water in a water storage tank, by preventing damage of a faucet, a fire hydrant and valves due to a lateral flow, even when a large earthquake of the East Japan large earthquake disaster class occurs.SOLUTION: An earthquake-resistant water storage tank comprises a horizontally installed steel cylindrical water storage tank 10 and a steel valve chest (a faucet chamber 30 and an emergency shutoff valve chamber 52) welded-joined to an upper part of the water storage tank 10, and concrete 60 or mortar is filled in a welding-joining part between the water storage tank 10 and the valve chest (30, 52). Here, the concrete 60 or the mortar can be filled under actual place welding parts 30c and 52c.

Description

  The present invention relates to an earthquake-resistant water storage tank, and in particular, when the ground is liquefied by an earthquake, a place where there is a concern about lateral flow in which the ground that has become muddy on a slope or stepped terrain moves horizontally. The present invention relates to an earthquake-resistant water tank which is suitable for being buried in a tank and is strong against lateral flow.

  In the event of an emergency such as an earthquake, when the water main loses its function and can no longer supply drinking water or fire-fighting water, the stored water inside it can be quickly supplied as drinking water or fire-fighting water. There are known emergency water tanks that are embedded as part of water facilities and buried underground.

  For example, in Patent Document 1, a water absorption pipe that sucks out the stored water of the water tank main body is extended while being buried in the ground, and a connection portion provided at an end of the water absorption pipe is located above the water tank main body at a position apart from the water tank main body. It is described that a connection portion such as a pump can be quickly connected to the connection portion of the water absorption pipe so that the stored water of the water storage tank body can be supplied quickly even in an emergency.

  Further, Patent Document 2 discloses that a cylindrical tank has two continuous insides along the major axis so that a space is formed between both ends of the cylindrical tank and both end plates of the cylindrical tank. A partition plate that partitions the flow path is provided, and the cylindrical tank is partitioned into two divided flow paths across one of the two flow paths partitioned by the partition plate of the cylindrical tank. A dividing partition plate is provided so that the inflow pipe is connected to the vicinity of the dividing partition plate in one of the divided flow paths of the cylindrical tank, and the outflow pipe is connected to the vicinity of the dividing partition plate of the other divided flow path of the cylindrical tank. Thus, it is described that the water remaining in the cylindrical tank is suppressed as much as possible.

  FIG. 1A is a plan view, FIG. 1B is a longitudinal sectional view taken along line BB in FIG. 1A, and FIG. 1C is a sectional view taken along line CC in FIG. 1B. Shown in a cross-sectional view along the line. A water supply for supplying water in the water storage tank 10 by connecting an engine pump or a hand pump to the upper part of a cylindrical water storage tank (hereinafter simply referred to as a water storage tank) 10 buried horizontally in the ground. In order to take the air outside the water storage tank 10 into the water storage tank 10 when discharging the air inside the water storage tank 10 from the stopper 12 and the water storage tank 10 or when supplying water from the water supply tap 12 to the outside. The air valve 16 and an emergency shut-off valve (hereinafter referred to as a separate emergency shut-off valve) are installed to prevent the outflow of water in the water storage tank 10 and to prevent the drinking water from being contaminated. , Simply referred to as a shutoff valve).

  The water faucet 12 is accommodated in a water faucet chamber 14 composed of, for example, a crushed stone 14a, a concrete foundation 14b, a concrete body 14c, a concrete receiving base 14d, and a manhole cover 14e having the same height as the ground surface GL. The air valve 16 is also accommodated in an air valve chamber 18 composed of, for example, a crushed stone 18a, a concrete foundation 18b, a concrete body 18c, a concrete cradle 18d, and a manhole cover 18e having the same height as the ground surface GL. ing. Here, the concrete body part 14c and the cradle 14d, and the concrete body part 18c and the cradle 18d are collectively referred to as a manhole side lump.

  In the figure, 22 is an inflow pipe provided substantially horizontally along the lower part of the water storage tank 10 and connected to the water main through a shut-off valve (not shown), and 24 is substantially along the upper part of the water storage tank 10. An outflow pipe connected to the water main through a shut-off valve (not shown) provided horizontally, 26 is a water supply pipe connected to the water tap 12, and 28 is for leaving foreign matter or the like in the recess. The water collecting pit 29 is a working ladder.

  In such an emergency water tank, tap water is constantly flowing from the main water pipe into the water storage tank 10 through the inflow pipe 22 and stored, and the stored water circulates by flowing out into the water main through the outflow pipe 24. New water is always stored. Therefore, it can be used as a fire hydrant that is part of the water main during normal times, and in the event of an emergency, it can be used to pump out drinking water.

JP 2000-129735 A Japanese Patent No. 3467378

  However, conventionally, as shown in FIG. 1, the faucet 12 and the air valve 16 are accommodated in the faucet chamber 14 and the air valve chamber 18 which are made of a manhole block made of concrete block. The block manhole side lump does not show the same behavior as the steel water storage tank 10, and particularly when the water storage tank 10 is buried in a terrain with a slope or a step, muddy water is generated when liquefaction occurs. Due to the lateral flow of the ground in the horizontal direction, the concrete block valve chamber (manhole side lump) installed at the top of the water storage tank 10 contacts the water tap 12 and the air valve 16, It was sometimes damaged.

  In paragraph 0047 of Patent Document 2, even when a strong seismic force is generated, devices such as an inflow pipe, an outflow pipe, and each shut-off valve are housed together in the shut-off valve chamber and integrated with the cylindrical tank. However, it is described that there is no risk of destruction because there is no relative movement with the cylindrical tank, but in the Great East Japan Earthquake, it received lateral flow along with the extensive liquefaction of the local ground, These were damaged by contact with the valves, and there was damage that the water tank main body had stored water but could not be used.

  The present invention has been made to solve the above-mentioned conventional problems, and even in the event of a large earthquake of the Great East Japan Earthquake class, it prevents damage to water hydrants, fire hydrants and valves due to lateral flow, The problem is to make the stored water available.

  The present invention is an earthquake-resistant water tank having a horizontally installed steel tubular water storage tank and a steel valve chamber welded and joined to the upper part of the water storage tank, the water storage tank, the valve chamber, The above-mentioned problem is solved by filling concrete or mortar in the welded joint.

  Here, the valve chamber can be divided into an upper part and a lower part and welded on site.

  Moreover, the said concrete or mortar can be filled below from the field welding part.

  The valve chamber may include a faucet chamber and an emergency shut-off valve chamber.

  According to the present invention, the valve chambers such as the faucet chamber and the emergency shutoff valve chamber are made of steel and are made of the same material as the water storage tank, and the weld joint between the water storage tank and the valve chamber is filled with concrete or mortar. The tank and valve chamber are integrated to increase the strength against horizontal movement, and even in the event of a major earthquake in the Great East Japan Earthquake class, the water faucet, fire hydrant and valves are prevented from being damaged due to lateral flow, and stored in the water storage tank. Water can be made available.

(A) Top view which shows a structure of an example of the conventional emergency water tank, (B) The longitudinal cross-sectional view which followed the BB line of FIG. 1 (A), (C) C- of FIG. 1 (B) Cross section along line C (A) top view which shows embodiment of this invention, (B) The longitudinal cross-sectional view which followed the BB line of FIG. 2 (A), and (C) The crossing along the CC line of FIG. 2 (B) Area Enlarged cross-sectional view along line III-III in Fig. 2 (B) Enlarged cross-sectional view along line IV-IV in Fig. 2 (B)

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the content described in the following embodiment and an Example. In addition, the constituent elements in the embodiments and examples described below include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in the so-called equivalent range. Furthermore, the constituent elements disclosed in the embodiments and examples described below may be appropriately combined or may be appropriately selected and used.

  In the embodiment of the present invention, as shown in FIG. 2, a steel water storage tank 10 installed horizontally, and a steel water supply for housing a faucet 12 welded to the upper part of the water storage tank 10. An earthquake-resistant water tank having a steel emergency shut-off valve chamber 52 for accommodating the plug chamber 30 and the emergency shut-off valve 50, wherein the water faucet chamber 30 and the emergency shut-off valve chamber 52 are shown in FIGS. As shown in detail in FIG. 4, for the convenience of transportation, the upper water faucet chamber 30a and the lower water faucet chamber 30b are divided into the upper shut-off valve chamber 52a and the lower shut-off valve chamber 52b, respectively, and field welding is performed at the on-site welds 30c and 52c. The concrete 60 is filled below the field welds 30c and 52c.

  In FIG. 3, 32 is an iron lid located on the surface GL of the faucet chamber 30, and 34 is a dedicated water conduit for connecting the suction pipe of the fire pump from the surface GL to absorb the water in the water storage tank 10. The water sampling port 38 is a water conduit that also constitutes a dedicated water conduit.

  In FIG. 4, reference numeral 54 denotes an iron lid positioned on the ground surface GL of the emergency shutoff valve chamber 52.

  In this way, by filling the weld joint between the water storage tank 10 and the water faucet chamber 30 and the weld joint between the water storage tank 10 and the emergency shut-off valve chamber 52 with the concrete 60, The shut-off valve chamber 52 and the water storage tank 10 are integrated. This makes it possible to match the behavior of the water tank 10 with the hydrant chamber 30 and the emergency shut-off valve chamber 52 when an earthquake occurs, and the relative movement of the hydrant chamber 30 and the emergency shut-off valve chamber 52 with the water tank 10 during lateral flow. Thus, the water tap 12 and the emergency shutoff valve 50 are not damaged. Furthermore, it is possible to prevent rainwater (including condensation), dust, and the like from accumulating inside the welded portion between the water storage tank 10 and the valve chamber (30, 52) and causing corrosion.

  In addition, in the said embodiment, although the concrete 60 was filled below the field welding parts 30c and 52c, a filling position is not limited to this.

  Further, the valve chambers targeted by the present invention are not limited to the water faucet chamber 30 and the emergency shut-off valve chamber 52. For example, when an emergency shut-off valve is separately installed as in Patent Document 1, the air valve 16 You may apply to.

  The filling material is not limited to the concrete 60, and other filling materials such as mortar may be used.

DESCRIPTION OF SYMBOLS 10 ... Reservoir tank 12 ... Water faucet 30 ... Water faucet chamber 30a ... Upper water faucet chamber 30b ... Lower water faucet chamber 30c ... Field welding part 50 ... Emergency shut-off valve 52 ... Emergency shut-off valve chamber 52a ... Upper shut-off valve chamber 52b ... Lower Shut-off valve chamber 52c ... field weld 60 ... concrete

Claims (4)

An earthquake-resistant water storage tank having a steel cylindrical water storage tank installed horizontally and a steel valve chamber welded and joined to the upper part of the water storage tank,
An earthquake-resistant water storage tank, wherein a welded joint between the water storage tank and the valve chamber is filled with concrete or mortar.   The earthquake-resistant water tank according to claim 1, wherein the valve chamber is divided into an upper part and a lower part and is welded on site.   The earthquake-resistant water tank according to claim 2, wherein the concrete or mortar is filled below a welded part on site.   The earthquake-resistant water tank according to any one of claims 1 to 3, wherein the valve chamber includes a faucet chamber and an emergency shut-off valve chamber.

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