JP2010133077A - Water storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water storage tank capable of suppressing the supply of water with high pH retained at the bottom of the tank and enabling the water stored therein to be effectively used by eliminating the need of dead water. <P>SOLUTION: This water storage tank which is connected to a distribution pipe and the inner surface of which is covered with mortar 45 includes a water supply part 51 for supplying the water in the tank to the outside. The water supply part 51 includes a water supply pipe 69 which is installed in the tank and extends toward the bottom B of the tank. An annular weir body 73 is provided at the bottom B of the tank. The weir body 73 surrounds the lower area 74 of the suction port 69a of the water supply pipe 69 from its surrounding. The height H between the bottom B of the tank and the upper end of the weir body 73 is equal to the interval C between the bottom B of the tank and the suction port 69a of the water supply pipe 69. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water storage tank that functions as a water supply tank during a disaster such as an earthquake.

  Conventionally, as this kind of water storage tank, for example, as shown in FIGS. 7 and 8, it is connected to a water pipe 11, and in normal times, tap water in the water pipe 11 is part of the water pipe 11. There is a water storage tank 13 through which water is passed and in the event of an emergency, the water supply pipe 11 and the tank body 12 are blocked.

  The water storage tank 13 includes a cylindrical tank body 12, and an introduction pipe 14 and a discharge pipe 15 that extend in the radial direction inside the tank body 12 are provided at both longitudinal ends of the tank body 12. The water supply pipe 11 and the introduction pipe 14 are connected via an introduction pipe 16, and the water supply pipe 11 and the lead-out pipe 15 are connected via a lead-out pipe 17.

  The introduction pipe 16 and the lead-out pipe 17 are connected via a bypass pipe 18. The pipes 16 to 18 are provided with first to third automatic opening / closing valves 19 to 21, respectively. The tank body 12 is provided with a drinking water supply pipe 22 for taking out tap water stored in the tank body 12 in the event of an earthquake or the like. The water supply pipe 22 extends in the radial direction inside the tank body 12, and a water supply valve 23 is provided on the upper part of the water supply pipe 22.

  In addition, as shown in FIG. 9, the inner surface of the tank main body 12 is coat | covered (lining) with the mortar 24 as an anticorrosion material. The water supply pipe 22 extends from the upper part of the tank toward the bottom of the tank, and a predetermined interval A is formed between the upper part and the lower part of the pumping port 22 a of the water supply pipe 22.

  According to this, in normal times, the first and second automatic opening / closing valves 19 and 20 are switched to open and the third automatic opening / closing valve 21 is switched to close, and the tap water in the water pipe 11 is connected to the introduction pipe 16. The water is introduced into the tank body 12 through the introduction pipe 14, and the tap water in the tank body 12 is led out to the water pipe 11 through the outlet pipe 15 and the outlet pipe 17.

Thereby, since tap water is fed through the water tank 11 through the water tank 13, the tap water is stored in the water tank 13 and the tap water is replaced.
In an emergency such as an earthquake, the first and second automatic opening / closing valves 19 and 20 are closed and the third automatic opening / closing valve 21 is switched to open, thereby disconnecting the connection between the water pipe 11 and the tank body 12. Thus, a certain amount of tap water is secured in the water storage tank 13.

  In this state, as shown by the phantom line in FIG. 8, the water supply hose 25 is connected to the water supply valve 23, and the engine pump 26 disposed on the ground and the water supply stand 27 are connected. By opening the water supply valve 23 and operating the engine pump 26, the tap water in the water storage tank 13 is pumped into the water supply pipe 22 from the pumping port 22a, and supplied to the water supply stand 27 through the water supply hose 25. Water can be supplied from the stand 27 to the victim as drinking water.

In addition, the above water storage tank 13 is described in the following patent document 1, for example.
JP-A-10-219765

  However, in the above-mentioned conventional format, the alkali content (calcium content) of the mortar 24 is precipitated (eluting), the pH of tap water in the vicinity of the mortar 24 is increased, and the specific gravity is increased by containing a large amount of calcium content. As a result, tap water having a high pH gradually accumulates at the bottom of the water storage tank 13.

  Such tap water with a high pH is unsuitable as drinking water, but when a disaster such as an earthquake occurs in a state where the tap water with a high pH stays at the bottom of the water storage tank 13, the tap water with a high pH is supplied. There is a problem that water is pumped from the pipe 22 and supplied.

  As a countermeasure against this problem, the discarded water is discarded until the pH of the tap water pumped from the water supply pipe 22 is lowered. However, it takes time and effort to perform such a discarded water. However, there are problems such as not being able to carry out quick water supply activities and wasting valuable water.

  Further, it is conceivable that the distance A between the bottom of the tank and the pumping port 22a of the water supply pipe 22 is increased so that the pumping port 22a is separated from the high pH water layer staying at the bottom of the tank as much as possible. In this case, since a large amount of tap water remains in the water storage tank 13, it is difficult to effectively use the tap water in the water storage tank 13.

  The present invention can suppress the supply of high pH water which is unsuitable as drinking water staying at the bottom of the tank, can eliminate waste water, and is stored in the tank. It aims at providing the water tank which can utilize effectively.

In order to achieve the above object, the first invention is a water tank that is connected to a water pipe and has an inner surface coated with an anticorrosive material that may generate a component that changes pH,
A water supply unit is provided to supply the water in the tank to the outside.
The water supply unit has a water supply pipe provided in the tank and extending toward the bottom of the tank,
A weir is provided at the bottom of the tank so as to surround the lower region of the pumping port formed at the lower end of the water supply pipe from the periphery.

  According to this, at the time of water supply, the water stored in the tank is pumped from the pumping port into the water supply pipe and supplied from the water supply part to the outside of the tank. At this time, the water with high pH staying at the bottom of the tank is obstructed by the weir body and hardly flows into the pumping port of the water supply pipe. Thereby, it can suppress that water with high pH will be water-supplied from a water supply part out of a tank, Therefore Waste water can be made unnecessary and a quick water supply activity can be performed.

  In addition, by providing a weir body at the bottom of the tank, the distance between the bottom of the tank and the pumping port of the water supply pipe is increased, and the pumping port stays at the bottom of the tank. It is not necessary to keep away from the high water layer as much as possible. Therefore, the amount of water remaining in the tank can be greatly reduced, and the water in the tank can be used effectively.

In the second invention, the height from the bottom of the tank to the upper end of the weir is the same as the distance from the bottom of the tank to the pumping port of the water supply pipe.
According to this, since the upper end of the weir body and the pumping port of the water supply pipe are at the same height, the amount of water remaining in the water tank with the weir body and the water tank without the weir body The amount of water remaining in the tank becomes the same, so that the amount of water supplied from the water tank provided with the weir body is the same as the amount of water supplied from the water tank not provided with the weir body.

In the third aspect of the present invention, in normal times, water in the water distribution pipe is passed through the tank as a part of the water distribution pipe, and in an emergency, the connection between the water distribution pipe and the tank is cut off.
According to this, since water always flows in the tank during normal times, the water is stored in the tank and the water in the tank is replaced, thereby preventing deterioration of the water quality in the tank.

  As described above, according to the present invention, high-pH water staying at the bottom of the tank is obstructed by the weir body and hardly flows into the pumping port of the water supply pipe. Thereby, it can suppress that water with high pH will be water-supplied from a water supply part out of a tank, Therefore Waste water can be made unnecessary and a quick water supply activity can be performed.

  In addition, by providing a weir body at the bottom of the tank, the distance between the bottom of the tank and the pumping port of the water supply pipe is increased, and the pumping port stays at the bottom of the tank. It is not necessary to keep away from the high water layer as much as possible. For this reason, the amount of water remaining in the tank can be greatly reduced, and the water in the tank can be used effectively.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, reference numeral 41 denotes a water storage tank connected to a water distribution pipe 42 constituting a water pipe, and conforms to the provisions of the Japan Ductile Iron Pipe Association Standard (JDPA) Ductile Iron Water Tank G1041 Is.

  The water storage tank 41 includes a tank main body 43 installed in the ground, and a connection pipe 44 that connects the tank main body 43 and the water distribution pipe 42. The tank body 43 includes a cylindrical straight pipe portion 43a and a cap portion 43b that closes both longitudinal ends of the straight pipe portion 43a. As shown in FIGS. 3 and 4, a mortar 45 is coated (lining) on the inner surface of the tank body 43. The mortar 45 is an example of an anticorrosive material, and an alkali component (calcium component) that raises the pH of water in the tank body 43 from neutrality may be precipitated (eluted) from the mortar 45.

  One end portion (upstream end portion) of the tank body 43 is provided with an inflow section 47 that draws water (tap water) in the water distribution pipe 42 into the tank and a fire water guiding section 48. Moreover, the outflow part 49 which flows out the water in a tank and returns it to the water distribution pipe 42, the water conduit 50 for fire fighting, and the water in a tank to the other end part (downstream end part) of the tank main body 43 to the exterior A water supply unit 51 for supplying water is provided.

  The inflow portion 47 includes a T-shaped tube 53 provided at the upper end of the outer peripheral surface of one end of the tank body 43, an inflow tube 54 provided in the tank and communicating with the lower end of the T-shaped tube 53, and a T-shaped tube. And an air valve 55 attached to the upper end of 53. The inflow pipe 54 has a plurality of inflow ports 54a.

  As shown in FIGS. 1, 2, and 4, each of the water guiding portions 48, 50 for fire fighting is provided with short tubes 57, 58 provided at the upper end of the outer peripheral surface of one end and the other end of the tank body 43, respectively. Fire water guide pipes 59, 60 provided in the tank and communicating with the lower ends of the short pipes 57, 58, repair valves 61, 62 attached to the upper ends of the short pipes 57, 58, and repair valves 61, 62 The water outlets 63 and 64 for fire fighting provided on the exit side of In addition, the suction port of fire extinguishing apparatuses, such as a fire extinguishing pump, can be attached or detached to each water sampling port 63,64 for fire fighting.

  As shown in FIGS. 1 to 3, the outflow portion 49 includes a T-shaped tube 65 provided at the upper end of the outer peripheral surface of the other end of the tank body 43, and a lower end of the T-shaped tube 65 provided in the tank. And an air valve 67 attached to the upper end portion of the T-shaped tube 65. The air valves 55 and 67 control the intake and discharge of air. The outflow pipe 66 is formed with a plurality of outflow ports 66a.

  The water supply unit 51 includes a short pipe portion 68 erected at the upper end of the outer peripheral surface of the other end of the tank body 43, and a water supply pipe 69 provided in the tank and having an upper end communicating with the lower end of the short pipe portion 68. And a repair valve 70 attached to the upper end of the short pipe portion 68, and a water supply port 71 provided on the outlet side of the repair valve 62. The water supply pipe 69 extends downward from the lower end of the short pipe portion 68 toward the tank bottom B, and has a pumping port 69a at the lower end thereof.

  An annular dam 73 is provided at the bottom B of the tank, and the dam 73 surrounds a lower region 74 of the pumping port 69a of the water supply pipe 69 from the periphery. The height H from the tank bottom B to the upper end of the weir body 73 is the same as the distance C from the tank bottom B to the pumping port 69a of the water supply pipe 69. Furthermore, the distance C from the bottom B of the tank to the pumping port 69a of the water supply pipe 69 is the same as the distance from the bottom B of the tank to the lower end openings of the fire water conduit pipes 59 and 60.

  The material of the weir body 73 is stainless steel (for example, SUS304), but is not limited to stainless steel, and a resin may be used. Further, the weir body 73 is not limited to an annular shape, and may be an elliptical annular shape or a polygonal annular shape.

As shown in FIGS. 2 to 4, the air valves 55 and 67 and the repair valves 61, 62 and 70 are housed in a valve operation chamber 81 formed in the ground.
As shown in FIG. 1, the connection pipe 44 has an inflow communication pipe 75 and an outflow communication pipe 76, and the water distribution pipe 42 and the T-shaped pipe 53 of the inflow portion 47 are connected via the inflow communication pipe 75. The water distribution pipe 42 and the T-shaped pipe 65 of the outflow portion 49 are connected via an outflow communication pipe 76.

  An emergency valve 77 is attached across the inflow communication pipe 75 and the outflow communication pipe 76. The emergency valve 77 has a bypass passage 78 communicating with the inflow communication pipe 75 and the outflow communication pipe 76 therein, and opens and closes the inflow and outflow communication pipes 75 and 76 and opens and closes the bypass passage 78. . Further, the water distribution pipe 42 is provided with a switching valve 79 positioned between a connection portion with the inflow communication pipe 75 and a connection portion with the outflow communication pipe 76. Normally, this switching valve 79 is fully closed.

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 1, in normal times, the emergency valve 77 is switched to one switching position V1, opens the inflow and outflow communication pipes 75 and 76, and closes the bypass passage 78. Thereby, the water in the water distribution pipe 42 flows into the tank main body 43 from the inlet 54a of the inflow pipe 54 through the inflow connecting pipe 75 and the T-shaped pipe 53, and the water in the tank main body 43 flows into the outflow pipe. The water flows out into the water distribution pipe 42 through the T-shaped pipe 65 and the outflow connection pipe 76 from the outlet 66a of 66.

  Thereby, since water is fed through the water storage tank 41 through the water storage tank 41, the water in the water distribution pipe 42 is passed through the water storage tank 41 as a part of the water distribution pipe 42, and the water is stored in the water storage tank 41. As it is stored, the water is replaced.

  In the event of an emergency such as an earthquake, the emergency valve 77 is switched to the other switching position V2 based on an external signal from the seismometer or a drop in water pressure in the distribution pipe 42, and the inflow and outflow communication pipes 75 and 76 are closed. Then, the bypass passage 78 is opened. Thereby, the connection between the water distribution pipe 42 and the tank main body 43 is cut off, and the water in the water distribution pipe 42 returns from the upstream side to the downstream side in the water distribution pipe 42 through the bypass passage 78 and is supplied to the tank main body 43. Not. A certain amount of water is secured in the tank body 43.

  When water is supplied, a water supply device 86 composed of an engine pump 84 and a water supply stand 85 is disposed on the ground, and a water supply hose 83 of the water supply device 86 is connected to the water supply port 71 as indicated by a virtual line in FIG. Then, by opening the repair valve 70 and operating the engine pump 84, water in the tank body 43 is pumped into the water supply pipe 69 from the pumping port 69a, passes through the short pipe portion 68, and then passes through the water supply hose 83. It is supplied to the water supply stand 85 and supplied to the victim from the water supply stand 85 as drinking water.

  At this time, when the alkali content (calcium content) of the mortar 45 is precipitated, the specific gravity is increased by containing a large amount of calcium content, and water having a high pH stays in the bottom B of the tank. As shown in FIG. 6, it is obstructed by the weir body 73 and is difficult to flow into the pumping port 69 a of the water supply pipe 69. Thereby, it can suppress that water with high pH will be supplied from the water supply part 51 to the water supply stand 85 outside a tank. Therefore, waste water can be made unnecessary, and quick water supply activities can be performed.

  In addition, by providing the weir body 73 at the bottom B of the tank, the distance A between the bottom of the tank and the pumping port 22a of the water supply pipe 22 is increased as in the prior art (see FIG. 9). It is not necessary to separate as much as possible from the high-pH water layer staying at the bottom of the tank. Therefore, the amount of water remaining in the tank can be greatly reduced, and the water in the tank can be used effectively.

  Further, since the height H from the tank bottom B to the upper end of the weir body 73 is the same as the distance C from the tank bottom B to the pumping port 69a of the water supply pipe 69, the upper end of the weir 73 and the pumping port 69a becomes the same height, thereby the amount of water remaining in the tank 41 of the water storage tank 41 provided with the weir body 73 and the amount of water remaining in the tank of the water storage tank 41 not provided with the weir body 73 And the water supply amount supplied from the water storage tank 41 provided with the weir body 73 is the same as the water supply amount supplied from the water storage tank 41 not provided with the weir body 73.

  When performing fire extinguishing activities, connect the suction port of a fire extinguishing device such as a fire extinguishing pump to at least one of the water sampling ports 63 and 64 for fire fighting, open the repair valves 61 and 62 connected to the fire extinguishing device, and then extinguish the fire. Activate the device. Thereby, the water in the tank main body 43 is supplied to the fire extinguishing apparatus through the water conduits 59 and 60 for fire fighting and the short pipes 57 and 58.

  In the first embodiment, as shown by the phantom line in FIG. 2, the power supply water supply device 86 composed of the connected engine pump 84 and the water supply stand 85 is connected to the water supply port 71 by the water supply hose 83. As a second embodiment, a manual water supply device including a wing pump may be connected to the water supply port 71 by a water supply hose 83.

  In each embodiment, as shown in FIG. 6, the inner surface of the tank body 43 is covered with the mortar 45 even in the lower region 74 surrounded by the weir body 73, but the area of the lower region 74 is Since it is very narrow, the alkali content deposited from the mortar 45 in the lower region 74 is very small compared to the whole, and does not cause a problem in water supply.

  Moreover, in each embodiment, although the mortar 45 was mentioned as an example of the anticorrosion material which may generate | occur | produce the component (alkali content) which raises the pH of water, it is not limited to the mortar 45. Moreover, the anticorrosive which may generate | occur | produce the component which reduces the pH of water from neutrality may be sufficient.

It is a top view of the water tank in the embodiment of the present invention. It is a longitudinal cross-sectional view of a water tank same as the above. It is an enlarged view of the water supply part and outflow part of a water tank same as the above. It is an enlarged view of the water supply part of a water tank and a fire water guide part. It is a XX arrow line view in FIG. It is an expanded sectional view of the pumping-up mouth of the water supply pipe of a water tank, and a weir body. It is a top view of the conventional water tank. It is a XX arrow line view in FIG. It is an enlarged view of the pumping-up port of the water supply pipe of a water tank, and its lower area | region.

Explanation of symbols

41 Water storage tank 42 Water distribution pipe 45 Mortar (corrosion protection material)
51 Water supply part 69 Water supply pipe 69a Pumping port 73 Weir body 74 Lower area B Bottom part of tank C Distance from bottom part of tank to pumping port of water pipe H Height from bottom part of tank to upper end part of weir body

Claims (3)

A water tank with an inner surface coated with an anticorrosive material connected to a water pipe and capable of generating a component that changes pH,
A water supply unit is provided to supply the water in the tank to the outside.
The water supply unit has a water supply pipe provided in the tank and extending toward the bottom of the tank,
A water storage tank, wherein a weir body is provided at the bottom of the tank so as to surround a lower region of a pumping port formed at a lower end of a water supply pipe from the periphery. The water storage tank according to claim 1, wherein the height from the bottom of the tank to the upper end of the weir body is the same as the distance from the bottom of the tank to the pumping port of the water supply pipe. 3. The water storage according to claim 1 or 2, wherein water in the water distribution pipe is passed through the tank as a part of the water distribution pipe in normal times, and the connection between the water distribution pipe and the tank is cut off in an emergency. Tank.

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