JP2001152694A - Renewal work method for existing water storage tank by non-cut-off water supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new method for the renewal work for a deteriorated existing water storage tank while making its water usable without suspension of water supply. SOLUTION: A new water storage tank 2 having a planar shape smaller than that of the existing tank 1 for placing the new tank inside an existing one is fabricated near the outside of the existing water storage tank, and the new water storage tank 2 is inserted and installed to the inside of the existing water storage tank 1 by utilizing buoyancy of stored water in the tank 1 in this nonsuspension of water supply renewal method. For the newly installed water storage tank 2, a hole 6 is drilled at the bottom plate position opposite to the inlet 4 of the existing water storage tank 1, a cylindrical body 9 equipped with a detachable lid 8 at the top end with the inner diameter larger than the inlet rising portion 7 of the tank 1 is provided, the cylindrical body 9 has a size, capable of flowing water 10 flowing from the inlet 4 to the outlet 16 through the cylindrical body 9, when inserting and installing the new tank 2 inside the existing tank 1, a filling and draining holes 12, having a valve capable of filling and draining stored water in the tank 1 at a position separated away from the cylindrical body 9 is provided, and the usage state is maintained, and the new tank 2 is inserted and installed in the existing tank 1 with non-cut-off water, while usage conditions are being maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to water supply, industrial water,
It relates to a method of updating existing water tanks for sewage and agricultural water to new water tanks.

[0002]

2. Description of the Related Art Conventionally, when renewing an existing water tank for aging water supply, industrial water, or the like, the use of the water tank cannot be normally interrupted. A new water tank was built in the vicinity, and after completion, the water source and supply pipes were reconnected and the old water tank was demolished.

[0003] In this case, the newly installed water tank is provided in a place where the ground has been strengthened by improving the ground of the foundation ground at the installation location,
In the case of concrete water tanks, reinforcing steel is arranged on the bottom and side faces, concrete is installed and concrete is poured in, and in the case of steel water tanks, steel tanks are welded and joined. After installing the bottom plate, the side plates were assembled and welded together to produce and build.

[0004] Although not intended to renew existing water tanks, the following are known as related technologies. Japanese Patent Application Laid-Open No. H11-256865 discloses an additional water storage tank which can be constructed without interrupting the use of the existing water storage tank, that is, without interruption. This technology is different from the renewal of an aging existing tank, but aims at increasing the capacity of the water storage in response to the need for increasing the water storage. As shown in FIG. The new tank 43 is set in a donut shape along the outer periphery of the side wall 23 as it is.

According to this technique, since the side wall 23 of the existing tank 41 is left as it is, the use state of the tank 41 can be continued and the construction of the new tank 43 can be performed, and the space of the additional tank 43 can be minimized. In addition, a tank having high maintainability and high earthquake resistance can be obtained.

Further, Japanese Patent Application Laid-Open No. 57-9394 discloses that
A method for constructing a double shell tank that shortens the construction period is disclosed. As shown in FIG. 10, the inner tank 45 is manufactured in parallel with the construction of the outer tank 44, and after the inner tank 45 is floated in the outer tank 44 filled with water, the water is gradually removed. The inner shell tank 45 is settled to settle, and a double shell tank is constructed.

[0007]

In the above-mentioned renewal method according to the prior art, a large space is required because a new storage tank is provided in a place different from the existing storage tank, and the ground 46 at the place where the new storage tank is installed is required. There was a problem that the construction period was lengthened due to the construction work such as reinforcement of the construction, and the construction cost became high.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for renewing an existing water tank, which is economical and can be constructed in a short period of time at the same place as the existing water tank while maintaining the use state of the water tank. Things.

As means for achieving some of the objects of the present invention, it has been conceived to utilize the above-mentioned related technology.
For example, there is a method in which the technique of “Japanese Patent Application Laid-Open No. 11-256865” is diverted and a new side wall is provided along the outer circumference of the side wall of the existing water storage tank. According to this method, the existing water storage tank can be used during the construction, but it cannot be used when the bottom plate of the existing water storage tank cannot be renewed and a space along the outer periphery of the existing water storage tank cannot be secured.

It is also conceivable to replace the outer tank in Japanese Patent Application Laid-Open No. 57-9394 with an existing water tank, and float and sink a new water tank corresponding to the inner tank in the existing water tank. However, according to this technique, as a means for floating and sinking the inner tank, the water applied to the outer tank is drained, and renewal work cannot be performed while the water tank is in use. In addition, the existing water storage tank has inlets, outlets, and rising portions for water supply and drainage, and the new water storage tank cannot be floated or settled in the existing water storage tank.

[0011]

SUMMARY OF THE INVENTION The present invention attains the object of the present invention by novel means not found in the prior art and related prior art, and the gist of the constitution is as follows. A new water storage tank 2 having a shape that can be stored in the existing water storage tank 1 is manufactured, and the new water storage tank 2 is suspended and inserted into the existing water storage tank 1 in use in which water is stored in the storage tank, and floats on the storage water 3. Then, the stored water 3 is poured into the new water storage tank 2 and gradually settles while adjusting the buoyancy. During this time, the water that has flowed in from the inflow port 4 of the existing water storage tank 1 is discharged from the outflow port 16 and the use state is continued. Immediately before the new water storage tank 2 has landed on the bottom plate 13 in the existing water storage tank 1, the inlet and the outlet of the new water storage tank 2 are opened to allow the inflow water 10 to flow out through the new water storage tank 2. Continue the use of the tank without interruption. Thereafter, a grout material 2 such as mortar is placed in a gap 18 between the inner peripheral surface of the existing water tank 1 and the outer peripheral surface of the new water tank 2.
4, the new water tank 2 is stopped and fixed to complete the renewal water tank.

According to the second aspect of the present invention, there is provided the first aspect.
In the method of continuous renewal of the existing water storage tank described in
In the existing water storage tank 1 having a rising part 26 in the water storage tank, a hole 6 is formed at a predetermined position of the bottom plate 5 of the new water storage tank 2 facing the outlet 16 of the existing water storage tank 1, and the existing outflow rising part is formed. An outlet cylinder 28 having an inner diameter larger than 26 is provided so that the new water tank 2 can be inserted into the existing water tank 1, and a detachable lid 29 is provided at an upper end of the cylinder 28. According to the third aspect of the present invention, in the method for continuously updating water in an existing water storage tank according to the second aspect, the outlet cylinder 2 is provided.
8 is provided with a valve 11 capable of pouring and draining the stored water 3 of the existing water storage tank 1 into the new water storage tank 1 on a lid 29 provided at the upper end of the water outlet 16.
And the inlet / drain port 12. Furthermore, in the invention of claim 4, in the method for continuously updating water in the existing water storage tank according to any one of claims 1 or 2, the cylindrical body 7 and the pouring and discharging port 12 of the inflow portion of the new water storage tank 2 are provided. Alternatively, annular water-stop packings 21 and 22 are provided on the back surface of the bottom plate at the position where the outlet cylinders 20 and 28 are attached. According to the invention of claim 5, in the method for continuously updating water in the existing water storage tank according to any one of claims 1 and 2, the rising portions 7, 26 of the inlet 4 or the outlet 16 and the lid 8, A seal member 31 is provided between the upper ends of the cylindrical bodies 9 and 28 from which the pipe 29 has been removed. Seal material 34
Is filled.

The new storage tank used in the present invention requires several conditions. Normally, the existing water storage tank is provided with an inlet and an outlet having a rising portion for receiving the stored water at the bottom. Therefore, the new water tank must be able to insert the new water tank without any trouble while maintaining the functions of the inlet and the outlet. In addition, it is necessary to provide a pouring port with a valve for adjusting buoyancy at the bottom of the new water tank.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a completed view of an embodiment in which an existing water tank 1 with a roof 17 provided with an outlet 16 in an underground pit 15 is updated according to the present invention, and FIGS. 2 to 7 show the working steps. As shown in FIG. 1 or FIG. 4, the new water tank 2 used in the present invention is made of steel whose plan shape is a shape that can be accommodated in the existing water tank 1 near the outside of the existing water tank. The new water tank 2 has a slightly smaller diameter than the existing water tank, so that the capacity may be made equal to that of the existing water tank 1 by increasing its height. If necessary, the capacity can be further increased to increase the capacity. .

In the new water tank 2, a hole 6 is formed at a predetermined position of the bottom plate 5 facing the inflow port 4 of the existing water tank 1, and communicates with the hole 6 so that an inflow rising portion 7 of the existing water tank 1 is formed. A cylindrical body 9 having a larger inner diameter, a flange 30 having a through hole for bolt insertion at the upper end, and a lid 8 detachably fixed to the flange by a bolt 8 is provided on the bottom plate 5 so as to stand upright. . The cylindrical body 9 is provided in the existing water tank 1 in the new water tank 2.
Can be inserted without any trouble at the time of installation, and the water 10 flowing from the inflow port 4 flows to the outflow port 16 through the gap 18 between the inner surface 9a of the cylinder 9 and the outer surface 4a of the inflow port with the lid 8 covered. Make the size of the inside diameter possible.

In the bottom plate 5 of the new water tank 2 at a position distant from the cylindrical body 9, the stored water 3 of the existing water tank 1 is injected for buoyancy adjustment, or the water 10 stored in the new water tank 2 is filled. A spout 12 with a valve 11 for outflow is provided.
The pouring and discharging port 12 may be used also as the outflow port 16. The reason why the drainage port 12 is provided at a position apart from the cylindrical body 9 is to prevent the water from remaining in the water storage tank (to prevent water from dying).
The valve 11 is provided for controlling the amount of water injected to adjust the settling speed of the newly installed water tank 2. This valve 11 may be removed after completion. The new water storage tank 2 may be manufactured on the ground in a space adjacent to the existing water storage tank 1, or may be manufactured by assembling a temporary stage above the existing water storage tank 1.

Hereinafter, a process of inserting and installing the new water tank 2 in the existing water tank 1 will be described. First, as shown in FIG. 3, the roof 17 of the existing water storage tank 1 is removed, a ramp (not shown) provided in the existing water storage tank 1 is removed, and the new water storage tank 2 is inserted beforehand. Get ready.

Next, as shown in FIG. 4, a plurality of cranes are placed in the existing water storage tank 1 in the water storage state with the injection / drain valve 11 in the new water storage tank 2 closed and the lid 8 placed on the upper end of the cylindrical body 9. The new water tank 2 is suspended and floated on the water surface by phase suspension (not shown). In addition, when assembling and manufacturing a temporary stage above the existing water tank 1, the new water tank 2 is suspended using a temporary jack. When the new water tank 2 is suspended and floated in the existing water tank 1 in the water storage state, the water level of the stored water 3 in the existing water tank 1 increases, but is drained through the overflow pipe 19. Next, as shown in FIGS. 4 and 5, the cylinder 9 of the new water storage tank 2 is positioned above the existing water storage tank 1 so as to face the inflow port 4, and the injection / drain valve 11 of the new water storage tank 2 is opened. Drain 1
The water 3 in the existing water storage tank 1 is taken into the new water storage tank 2 from 2 and the buoyancy of the new water storage tank 2 is reduced and the water is gradually settled. The sedimentation speed can be adjusted by opening and closing the drainage valve 11. The operation of the drainage valve 11 is appropriately performed manually by a diver or remotely from outside the water storage tank.

During this time, the water 10 flowing from the inflow port 4 of the existing water storage tank 1 flows through the existing water storage tank 1 to the outflow port 16 to ensure the use condition. As the sedimentation of the new water storage tank 2 proceeds, the inflow rising part 7 of the existing water storage tank 1 enters the cylinder 9 of the new water storage tank 2, and the inflow water 10 passes through the inside of the cylinder 9 to flow under the bottom of the new water storage tank 2. It flows and flows out of the outlet 16.

When the bottom plate 5 of the new water tank 2 approaches the bottom plate 13 of the existing water tank 1, the lid 8 of the cylindrical body 9 is removed by diver work as shown in FIG. 4, water is caused to flow into the new water tank 2, the new water tank 2 reaches the bottom plate 13 of the existing water tank 1, and the inflow water 10 is brought into the new water tank 2 with the injection / drain valve 11 fully opened. Store and use so that it can be discharged. In addition, new water tank 2
If the annular water-stop packings 21 and 22 are provided on the back surface (lower surface) of the bottom plate 5 at the position where the cylindrical body 9 at the inlet portion and the inlet / drain port 12 or the outlet cylindrical body 20 are attached, the new water tank 2
Is settled on the upper surface of the bottom plate 13 of the existing water storage tank 1, the cylinder 9 of the inflow port 4 and the injection / drainage port 12 or the outflow cylinder 2.
0 can be reliably sealed.

Next, grout 24 is filled in the gap 18 between the inner surface of the side wall 23 of the existing water tank 1 and the outer surface of the side wall 14 of the new water tank 2. The grout material 24 to be used is
If it is narrow, use cement milk or mortar, etc.
When the gap 18 is wide, concrete or the like can be used. When grout material 24 is injected, the gap 1
8 is carried out in a dry state, or is placed underwater in a state where the stored water 3 is present. In the case of underwater casting, a tremy tube is used to perform casting from the bottom (not shown).

In the case of a water tank with a roof 17 either before or after the grouting operation of the grout material 24, a roof 17a is attached to the upper part of the new water tank 2, and the overflow port 25a of the new water tank 2 overflows. The flow tube 19 is connected by a short tube 48 or the like.
With the above process, the new water storage tank 2 is kept in the existing water storage tank 1 without interruption.
Complete the renewal of the water tank with the inserted.

FIG. 7 shows an embodiment in which the present invention is applied to an existing water tank 1 having a rising portion 26 in which an outlet 16 rises in the existing water tank 1 like the inlet 14. In this case, a hole 27 is formed at a predetermined position of the bottom plate 5 in the new water tank 2 facing the outlet 16 of the existing water tank 1, and the same as the cylindrical body 9 provided to face the above-mentioned inlet 4. The cylindrical body 28 is erected on the bottom plate 5 so as to communicate with the hole 27 so that the new water tank 2 can be inserted into the existing water tank 1, and the stored water 3 of the existing water tank 1 is inserted into the new water tank 2. A pouring / draining port 12 with a valve 11 capable of pouring / draining is provided. In this embodiment, the spout / drain port 12 with the valve 11 is provided on the lid 29 provided at the upper end of the outflow cylinder 28, and is also used as the outflow port 16 and the spout / drain port 12. May be independently provided at a position away from the camera.

In both embodiments, in order to ensure that the rising portions 7 and 26 of the inflow port 4 or the outflow port 16 are sealed, as shown in FIG. 8, the lids 8 and 2 of the cylindrical bodies 9 and 28 are provided.
9 is lower than the rising portions 7 and 26 of the inlet 4 or the outlet 16 and the lids 8 and 29
Is provided with a downward opening concave portion 8a for accommodating the rising portions 7, 26 and a mounting flange 8b, and after removing the lids 8, 29, a flexible plate-shaped or tubular sealing member is provided. One end of the base 31 abuts against the outer peripheral surfaces of the rising portions 7 and 26 and is watertightly tightened and fixed by the band 32. After being fixed by bolts 50 and nuts inserted into the cylinders 9, 28,
And the rising portion 7, 26 of the inflow port 4 or the outflow port 16, the gap 18 a between the sealing member 31 and the bottom plate 13,
The sealing material 34 may be injected from the sealing material injection pipe 33 piped to the upper end of the container, and may be drained from the drain pipe 51. As the sealing material 34 to be used,
A sealing material such as a hardening-in-water resin or cement milk which has fluidity at the time of injection and solidifies in water with the passage of time is used.

As the existing water tank 1 to which the present invention is applied,
Any of steel, concrete, FRP and the like may be used.

(Embodiment) An embodiment in which the present invention is applied to replacement of an existing water tank for aged water supply will be described below. The existing water tank 1 to be updated is the same as that shown in FIG. 1 or 3, and the side plate 38 forming the bottom plate 13 and the side wall 23 is manufactured by welding a steel plate having a plate thickness of 6 mm to 11 mm. The shape is a cylindrical existing water storage tank 1 having an inner diameter of 18 m and a height of 12 m, with a dome-shaped roof 17. This dome-shaped roof 17
Will be removed prior to renewal work.

In the existing water storage tank 1, a rising portion 7 having a height of 1 m is formed by vertically bending an end of an inflow pipe (water supply pipe) 35 having a diameter of 350 mm, which is provided from a water source. A trumpet-shaped inflow port (outlet of water into the water storage tank) is formed so as to open so as to increase in diameter toward the water tank. The central portion of the bottom plate 13 of the existing water tank 1 is opened and communicates with the underground pit 15. The underground pit 15 is connected to an outlet 16 of an outflow pipe (water supply pipe) 36 for supplying water to a water supply destination. A mud pipe 37 is provided. Usually, the valve 39 provided in the middle of the drainage pipe 37 is closed, and muddy water flows only when the existing water storage tank 1 is cleaned.

An overflow port 25 for allowing the overflow of the stored water 3 to escape is provided above the side plate 38 of the existing water storage tank 1, and is connected to the above-mentioned mud drain pipe 37 through an overflow pipe 19.

The new water storage tank 2 is a steel water storage tank, as shown in FIG. 1 or FIG. 4, manufactured by welding and joining steel plates, so that the existing water storage tank 1 can be smoothly inserted and installed in the existing water storage tank 1. The gap 18 with the inner wall 1 is 500 mm, and the outer diameter is 17 m. The height is set to 13.5m, and the height is increased by the smaller diameter than the existing water storage tank 1, so that a volume almost equal to that of the existing water storage tank 1 is secured.

The cylindrical body 9 provided to face the rising portion 7 of the inflow pipe 35 has an inner diameter of 600 mm and a height of 1.5 m so that the inflow water 10 can flow down through the cylindrical body 9. The cover 8 fixed to the base 30 by bolts 47 is attached.

The underground pit 15 in the center of the bottom plate 13
Above is provided a pouring / draining port 12 with a valve 11 for adjusting buoyancy. This pouring / draining port 12 is used as an outlet of the stored water 3 after the completion of the new water tank 2.

Since the bottom plate 5 on the underground pit 15 does not support the ground, it is reinforced by welding a vertical rib 40 made of a mold steel or the like. Further, an overflow port 25 is opened at an overflow position above the side plate of the new water storage tank 2.

Attachment part of the cylindrical body 9 and underground pit 1
On the back surface (lower surface) of the bottom plate 5 of the new water storage tank 2 opposed to the opening edge of the water storage tank 5, waterproof packings 21 and 22 made of rubber or the like are attached and fixed with an adhesive or the like. This waterproof packing 2
When filling the grout material 24 into the gap 18 between the inner wall of the existing water tank 1 and the new water tank 2, the grout material 24 is necessary when the grout material 24 is dry, and is unnecessary when the grout material 24 is filled in the presence of the water storage 3. is there.

By inserting the new water storage tank 2 into the existing water storage tank 1 in the above-described process, the existing water storage tank 1 as shown in FIG.

In the case of the present invention, the existing water storage tank 1 can be used as a form when the new water storage tank 2 is constructed and a part of the frame of the new water storage tank 2 and the grout material 24 are cast. it can.

[0036]

According to the present invention, the existing water storage tank 1 can be used without interruption.
Can be renewed, so that the use condition of the water storage tank is not interrupted and the water supply user is not affected even during the construction period. In addition, since the new water tank 2 is installed in the existing water tank 1, no new installation space is required, construction work such as strengthening the ground at the new installation place becomes unnecessary, and there is a significant reduction in the construction period and economic effect. In addition, since the buoyancy of the stored water 3 is used for the work of inserting the new water tank 2 into the existing water tank 1, the use of a crane or other lifting machine is sufficient only for the first hanging operation, and the period of use can be reduced. It is safe because it can reduce the fee for use and shorten the period of dangerous work.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view showing an embodiment of an existing water tank updated by the method of the first embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of FIG.

FIG. 3 is a partially longitudinal side view showing a preparatory work for an existing water storage tank and showing a state in which a roof of the existing water storage tank is being dismantled and removed.

FIG. 4 is a partially longitudinal side view showing a state in which a new water storage tank is inserted and floated in an existing water storage tank.

FIG. 5 is a partially longitudinal side view showing a sedimentation state of a new water storage tank.

FIG. 6 is a partially longitudinal side view showing a state in which a new water tank is settled on the bottom surface of the existing water tank.

FIG. 7 shows a second embodiment of the present invention applied to another type of existing water tank.
FIG. 4, showing the embodiment, is a partially longitudinal side view showing a settling state of a new water storage tank.

FIG. 8 is an explanatory view showing a method for sealing the inflow rising pipe and the cylindrical body.

FIG. 9 is a vertical sectional side view showing a first conventional example.

FIG. 10 is a vertical sectional side view showing a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing water tank 2 New water tank 3 Reservoir 4 Inflow port 5 Bottom plate of new water tank 6 Hole of new water tank 7 Inflow rising part 8 Lid 9 Cylindrical body 10 Inflowing water 11 Injectable / drainable valve 12 Filling / draining port 13 Bottom plate of existing water storage tank 14 Grout 15 Pit 16 Outflow port 17 Roof 18 Gap (or gap) 18a Gap 19 Overflow pipe (or overflow pipe) 20 Outlet cylinder 21 Waterproof packing 22 Waterproof packing 23 Side wall 24 Grout material 25 Overflow port 26 Rising part 27 Hole 28 Cylindrical body 29 Cover 30 Flange 31 Seal member 32 Band 33 Seal material injection pipe 34 Seal material 35 Inflow pipe (water supply pipe) 36 Outflow pipe 37 Drainage pipe 38 Side plate 39 Valve 40 Rib 41 Existing Tank 44 Outer tank 45 Inner tank 46 Foundation ground 47 Bolt 48 Short pipe 49 Steel ring push Shell 50 bolt 51 water drain pipe

Continued on the front page (72) Inventor Kamizaki Mami 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation (72) Inventor Nobuhiro Kitahara 2-6-3, Otemachi, Chiyoda-ku, Tokyo F-term in Nippon Steel Corporation (reference) 3E070 AA03 AB02 GB01 GB04 JB04

Claims (5)

[Claims] 1. A new water storage tank having a plan shape that can be stored in an existing water storage tank is manufactured near the outside of the existing water storage tank, and the new water storage tank is installed by utilizing the buoyancy of the stored water existing in the existing water storage tank. This is a method of continuously updating the existing water tank inserted into the water tank, and the new water tank to be manufactured near the outside of the existing water tank is drilled with a hole at the bottom plate position facing the inflow port of the existing water tank. A cylindrical body having an inner diameter larger than the inflow rising portion and having a detachable lid at the upper end is provided. The cylindrical body allows water flowing from the inflow port to flow through the cylindrical body when a new water storage tank is inserted into the existing water storage tank. The outlet should be large enough to be circulated, and a drainage port with a valve is installed at a position away from the cylinder to allow the water in the existing reservoir to be drained into the new reservoir. When inserting a new water tank into a water tank, first install it in the existing water tank. After making advance preparations so that the new water storage tank can be inserted, the new water storage tank is suspended in the existing water storage tank and suspended in the water, and the new water storage tank is placed above the existing water storage tank at an inlet facing the existing water storage tank. Position the barrel of the tank,
Opening the valve of the new water tank, taking water from the existing water tank into the new water tank through the inlet and outlet, and gradually sinking the new water tank, and then the bottom plate of the new water tank is When approaching the bottom plate, remove the lid of the cylindrical body, allow water to flow into the new water tank from the inflow port of the existing water tank, make the new water tank reach the bottom plate of the existing water tank, and open the valve. A state where the inflow water can be stored and drained into the new water storage tank, and a grout material is filled into the gap between the existing water storage tank and the new water storage tank, so that the existing water storage tank can be used without interruption. A method for continuously renewing water in an existing water tank, comprising a step of installing a new water tank in the water tank, and a step to step. 2. An existing water storage tank having an outflow pipe having a rising portion in the water storage tank, wherein a hole is formed in a predetermined position of a bottom plate of the new water storage tank opposite to the outlet of the existing water storage tank, and a hole is formed from the existing outflow rising part. 2. The existing water storage tank according to claim 1, further comprising an outlet cylinder having a large inner diameter, wherein a new water storage tank can be inserted into the existing water storage tank, and a detachable lid is provided at an upper end of the cylinder. Constant renewal method. 3. A valve provided at an upper end of the outlet cylinder with a valve capable of injecting and draining water stored in an existing water tank into a new water tank, and serving as an outlet and a water inlet and outlet. Claim 2
Permanent water renewal method for existing water tank described. 4. An annular watertight packing is provided on a back surface of a bottom plate at a mounting position of an inlet and a drainage port or an outlet cylinder of a new water storage tank. Item 2. The method of continuous renewal of the existing water storage tank according to item 2. 5. A seal member is provided between a rising portion of an inlet or an outlet and an upper end of a tubular body having a lid removed, and a gap is provided between the rising plate and the bottom plate of an existing water tank sealed by the seal member so as to have fluidity during injection. 3. The method for continuously updating water in an existing water storage tank according to claim 1, wherein a sealing material which solidifies in water with the lapse of time is filled.