JP2018197483A - Construction method of water-main direct connection type water supply apparatus - Google Patents

Abstract

To perform changing work without causing breakage of a deteriorated distributing pipe by the water pressure of a water main, when changing water supply means to a necessary water supply part of each floor in a building of an old construction age, from a water-supply system using a water receiving tank using the water receiving tank and an elevated water tank to a water-supply system directly connected to the water main, by using an existing lifting pipe and the distributing pipe of the building for the changing work.SOLUTION: A construction method of a water-main direct connection type water-supply system in a building 8 of an old construction age comprises the steps of: separating a lifting pipe 6 from a water receiving tank 2 and separating a distributing pipe 11 from an elevated water tank 9; connecting a water main 3 to a lower end of the existing lifting pipe 6 via a pressure-reducing valve 13; connecting an upper end of the lifting pipe 6 to the upper end of the existing distributing pipe 11 and providing an air valve 18 at the upper end of the lifting pipe 6; and reducing the water pressure of the water main 3 to a required water pressure with the pressure-reducing valve 13. The required water pressure is set to the same level as the water pressure of a water supply part 12a at the top floor of the building 8 obtained by a water supply apparatus using a water receiving tank.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a construction method of a water main directly connected water supply device for changing a water tank use type water supply device to a water main directly connected water supply device in a building such as an old mansion, a hotel or a school. It is.

  In buildings such as condominiums, hotels, schools, etc. that are older in age, water supply to the required places on each floor has been performed by a water supply tank-use water supply apparatus 1A as shown in FIG. 1, for example. The water tank utilization type water supply device 1A is configured to temporarily store tap water of a water main 3 through a water pipe 4 in a large capacity water tank 2 provided on the ground, underground, or the like. The stored water 5 is stored in a high water tank 9 on the roof of the building 8 by a pump 7 through a pumping pipe (made of steel pipe) 6, and the stored water 10 in the high water tank 9 is stored from the high water tank 9. It was comprised so that the required water supply part (water supply faucet etc.) 12 in the dwelling unit etc. of each floor could be supplied with water by natural fall via the extending distribution pipe (made of steel pipes) (patent documents 1 and 2).

  However, in this type of water tank utilization type water supply device 1A, the water taken from the water main 3 is fed into the large capacity water tank 2 and temporarily stored in the water tank 2, and then Since it is fed into the elevated water tank 9 and stored in the elevated water tank 9, when the hygienic management of the water receiving tank 2 or the elevated water tank 9 is insufficient, a water supply faucet or the like The problem that unsanitary water was supplied to the water supply part 12 arose.

  Therefore, it is necessary to periodically perform maintenance such as water quality inspection of the stored water 5 in the water receiving tank 2 and the stored water 10 in the elevated water tank 9 and cleaning of the water receiving tank 2 and the elevated water tank 9. In addition, there is a problem that the maintenance cost is high, and when the apparatus is old, there is a problem that the economic burden is large, such as replacement of the water receiving tank 2, the elevated water tank 9, and the pump 7.

  Therefore, in order to solve such problems, the water main directly connected type that directly supplies the tap water of the water main 3 to the water supply unit 12 in each dwelling unit without providing the water receiving tank 2 and the elevated water tank 9. Water supply equipment is beginning to spread. When the water main directly connected water supply device is used, the water receiving tank 2 and the elevated water tank 9 are not required, so that fresh water can be supplied to the water supply section in each dwelling unit of the building 8 and the water receiving tank. Maintenance such as water quality inspection of the stored water 5 in the water tank 2 and the stored water 10 in the elevated water tank 9 and cleaning of the water receiving tank 2 and the elevated water tank 9 are not required, so that maintenance management is facilitated. There was an advantage such as being planned.

  By the way, when the above-described water tank utilization type water supply device is changed to such a water main direct connection type water supply device, when the age of the building is as old as, for example, about 35 years or more, the existing pumping pipe (made of steel pipe) is used. ) And water pipes (made of steel pipes) are used as they are to make up the water supply device. The important thing to keep in mind is that the old water pipe 11 is not damaged by the water pressure of the water main 3. It was a point that it must not be.

  More specifically, when using the water receiving tank utilizing type water supply device 1A, the stored water 5 in the water receiving tank 2 is pumped into the elevated water tank 9 via the pumping pipe 6 by the pump 7. Therefore, the pumping pipe 6 had a strength capable of withstanding the water pressure by the pump 7. On the other hand, the water distribution pipe 11 is a pipe for supplying the stored water 10 in the elevated water tank 9 to the water supply section 12 in the dwelling unit or the like of each floor by natural fall. However, it was only strong enough to withstand the water pressure caused by the natural fall. Therefore, when making the change using the existing pumping pipe 6 and the existing water pipe 11, it is essential to pay attention so that the aging water pipe 11 is not damaged by the water pressure of the water main 3. It was.

Japanese Patent Laying-Open No. 2006-151153 Japanese Patent Laid-Open No. 9-273185

  In the present invention, water supply means to the required water supply section of each floor for buildings such as condominiums, hotels, schools, etc., which are older in construction, is changed from a conventional water tank use type water supply device to a water main direct connection type water supply device. When the change is made using the existing pumping pipe and the existing distribution pipe in the building, the construction of the change is performed so that the aging distribution pipe is not damaged by the water pressure of the water main. It is a subject to perform.

  In order to solve the above problems, the present invention employs the following means. That is, in the construction method of the water main direct connection type water supply apparatus according to the present invention, the tap water of the water main is fed into the water receiving tank and stored in the water receiving tank, and the stored water in the water receiving tank is stored in the pumping pipe. The pump is fed into the elevated water tank on the roof of the building and stored in the elevated water tank, and the stored water in the elevated water tank is naturally dropped to the required water supply section on each floor of the building In a water supply tank-use type water supply apparatus in a building, which is configured to be supplied with water through a water pipe, it is a construction method for a water main directly connected water supply apparatus that does not require the water tank and the elevated water tank. Separating the pumping pipe from the water receiving tank, separating the water distribution pipe from the elevated water tank, connecting the water main to the lower end side of the pumping pipe via a pressure reducing valve, The upper end side of the pumping pipe is connected to the upper end side of the water pipe, and the upper end of the pumping pipe is connected to the inside of the pipe. A step of providing an air valve for discharging the accumulated air and a step of reducing the water pressure of the water main to a required water pressure by the pressure reducing valve, and the required water pressure was obtained in the water receiving tank utilizing water supply device The water pressure of the water supply section on the top floor of the building is set to the same level.

  When it is according to the present invention, water supply means to the required water supply section of each floor for buildings such as condominiums, hotels, schools, etc. that are older in age, from the water receiving tank using type water supply device to the water main directly connected type water supply When changing to equipment, when the change is made using existing pumps and existing pipes in the building, it can be constructed so that the old pipes are not damaged by the water pressure of the water main. Thus, a safe water main direct connection type water supply device can be configured.

  And in this invention, since the said water tank and the said high water tank are not required, while being able to supply fresh water to the water supply part in each dwelling unit etc. of a building, the water quality test of the above-mentioned water tank and the above high water tank Maintenance such as cleaning and cleaning is not necessary, and the maintenance management cost required for these can be reduced. In addition, since the water main direct connection type water supply apparatus can be configured using an existing pumping pipe and an existing water distribution pipe, the construction cost can be reduced. In addition, in the present invention, since a pump such as a booster pump used in the above-mentioned patent document is not used at all, there is an economical efficiency that eliminates the need for an electricity charge for its operation.

It is explanatory drawing explaining the conventional water-receiving tank utilization type water supply apparatus. It is explanatory drawing explaining the water main direct connection type water supply apparatus which concerns on this invention.

  1-2, the construction method (hereinafter referred to as construction method) of a water main direct connection type water supply apparatus according to the present invention is a water tank utilization type water supply apparatus 1A (Fig. It relates to a construction method of a water main direct connection type water supply device for changing 1) to a water main direct connection type water supply device 1B (FIG. 2).

  As shown in FIG. 1, the water tank utilization type water supply device 1 </ b> A temporarily stores tap water of a water main 3 through a water pipe 4 in a large capacity water tank 2 provided on the ground or underground. The stored water 5 in the water receiving tank 2 is stored in a high water tank 9 on the roof of the building 8 by a pump 7 through a pumping pipe (made of steel pipe) 6, and the stored water 10 in the high water tank 9 is stored. Water is supplied to the required water supply section (water supply faucet or the like) 12 in a dwelling unit or the like of each floor through the water distribution pipe 11 through a water distribution pipe (made of steel pipe) 11 that extends from the elevated water tank 9. ing.

  The construction method according to the present invention includes a step of separating the pumping pipe 6 from the water receiving tank 2 and a step of separating the water distribution pipe 11 from the elevated water tank 9 in the water receiving tank-use water supply apparatus 1A in the building 8. Connecting the water main 3 to the lower end side 14 of the pumped water pipe 6 via the pressure reducing valve 13, connecting the upper end side 15 of the water pumped pipe 6 to the upper end side 16 of the water distribution pipe 11, and A step of providing an air valve 18 for releasing the air accumulated in the pipe at the upper end 17 of the pumping pipe 6, and a step of reducing the water pressure of the water main pipe 3 to a required water pressure by the pressure reducing valve 13; It is set to the same level as the water pressure of the water supply section 12 on the uppermost floor of the building 8, which is obtained in the water tank utilization type water supply device 1A. Hereinafter, this will be described more specifically.

The building 8 is, for example, a four-story condominium that has passed about 35 years after its construction, and the water pressure of the water supply section (water faucet, etc.) 12a on the fourth floor of the building 8 extends over, for example, two days. The average value of the data of a self-recording water pressure measuring instrument capable of recording water pressure fluctuations at any time for 24 hours was about 0.8 kgf / cm ² . The water pressure in the water main 3 was about 4 kgf / cm ² in terms of the average value of the self-recording water pressure measuring device for 24 hours over 2 days, for example.

  Prior to the change, the lower end 19 (FIG. 1) of the pumping pipe 6 is separated from the water receiving tank 2, and the upper end 20 of the intake pipe 4 connected to the water main pipe 3 is connected to one end 22 of the connecting pipe 21. The other end 23 is connected to the lower end side 14 of the pumped water pipe 6 through a connecting pipe 21. The connecting pipe 21 is provided with the pressure reducing valve 13.

  Further, the upper end 24 (FIG. 1) of the water distribution pipe 11 is separated from the elevated water tank 9, and the upper end side 15 of the pumped pipe 6 is connected to the upper end side 16 of the water distribution pipe 11. As described above, the air valve 18 for releasing the air in the pumping pipe 6 is provided at the upper end 17 of the pumping pipe 6. In this state, the water receiving tank 2 (FIG. 1) and the elevated water tank 9 (FIG. 1) can be removed.

Thereafter, the water pressure in the water main 3 is reduced to the required water pressure by the pressure reducing valve 13. In the present embodiment, the required water pressure is reduced to the fourth floor (topmost) in the water supply tank-type water supply apparatus 1A. It is set to the same level as the water pressure obtained at the faucet part 12a (a kind of the water supply part 12). In the present embodiment, the above-described 0.8 kgf / cm ² is set.

By the way, the pumping pipe 6 is configured to withstand the water pressure by the pump 7 when the stored water 5 in the water receiving tank 2 is fed into the elevated water tank 9 by the pump 7. Therefore, the water pumping pipe 6 has a higher pressure resistance than the water pipe 11 designed to be able to withstand the water pressure due to natural fall. For example, it had a pressure resistance of ² kgf / cm ² . Therefore, the pumping pipe 6 can sufficiently withstand the above 0.8 kgf / cm ² . Then, the by setting the required water pressure to 0.8 kgf / cm @ 2, for water pressure of the water supply section of a connection to the instant water heaters installed in the fourth floor (top floor) is also a 0.8 kgf / cm ² The instant water heater can be operated reliably.

  If the water pressure of the water main 3 is not reduced by the pressure reducing valve 13, the water pressure of the water main 3 is directly applied to the aging water pipe 11, so that the water pipe 11 is damaged. There is a fear.

  When the water main direct connection type water supply device 1B configured in this way is used, the water distribution pipe portion (portion existing on the fourth floor of the water distribution pipe 11) 11a on the fourth floor (top floor) of the building is a conventional one. Since only a water pressure of the same level as that obtained in the water receiving tank utilizing type water supply device 1A is applied, no excessive water pressure is applied to the water distribution pipe portion 11a. In addition, the water distribution pipe part on the third floor (the part existing on the third floor of the water distribution pipe 11) 11b, the water pipe part on the second floor (the part existing on the second floor of the water distribution pipe 11) 11c, the water pipe part on the first floor (the above-mentioned The portion 11d on the first floor of the water distribution pipe 11 is only subjected to the same level of water pressure as that in the water-receiving tank utilizing water supply device 1A. For this reason, the water main direct connection type water supply device 1B can be used without applying excessive water pressure to each part of the existing water distribution pipe 11 in a state that is not different from the case of using the conventional water receiving tank utilization type water supply device 1A. It will be available.

  When using the water main direct connection type water supply apparatus 1B having such a configuration, the water tank 2 (FIG. 1) and the elevated water tank 9 (FIG. 1), which have been essential in the past, are not used. While fresh water can be supplied to the water supply section 12 in each dwelling unit, etc., water quality inspection of the stored water 5 in the water receiving tank 2 and the stored water 10 in the elevated water tank 9, and the water receiving tank 2 and the elevated water tank Since the maintenance such as cleaning 9 is unnecessary, there is an advantage that the maintenance management cost required for these can be reduced.

  And since this water main direct connection type water supply apparatus 1B can supply water without using the said water tank 2 and the said high water tank 9, it can supply fresh water to required water supply parts, such as each dwelling unit of a building. In addition, since no pump is used, there is no need for an electricity charge for its operation, and there is an economy that does not require pump repair or pump replacement.

  The present invention is by no means limited to those shown in the above-described embodiments, and it goes without saying that various design changes can be made within the scope of the claims. One example is as follows.

(1) If the tap water can be supplied to the uppermost floor of the building 8 by using the water pressure of the water main 3 without using a pump, the building 8 may have five or more floors.

(2) When the water pressure of the water main 3 is reduced to the required water pressure by the pressure reducing valve 13 (FIG. 2), the water pressure after the pressure reduction varies depending on the building and is specified to 0.8 kgf / cm ² as described above. is not. The water pressure after the depressurization was obtained with the water tank 1A, and the water pressure of the water supply unit 12a on the top floor of the building 8 was measured with a water pressure measuring device such as the self-recording water pressure measuring device. It is set based on the result.

1A Receiving tank use type water supply device 1B Water main main direct connection type water supply device 2 Water receiving tank 3 Water main main 4 Intake pipe 5 Reservoir 6 Pumping pipe 7 Pump 8 Building 9 High water tank 10 Reservoir 11 Distribution pipe 12 Water supply section 13 Pressure reducing valve 18 Air valve

Claims (1)

The tap water of the main water pipe is fed into the water receiving tank and stored in the water receiving tank, and the stored water in the water receiving tank is pumped into the elevated water tank on the roof of the building through the pumping pipe. In the building, which is stored in the elevated water tank, and the stored water in the elevated water tank is supplied to the required water supply portion of each floor of the building through a water pipe by natural fall. In the water tank utilization type water supply apparatus, a construction method of the water main directly connected water supply apparatus that does not require the water tank and the elevated water tank,
Separating the pumping pipe from the water receiving tank;
Separating the water pipe from the elevated water tank;
Connecting the water main to the lower end side of the pumping pipe via a pressure reducing valve;
Connecting the upper end side of the pumping pipe to the upper end side of the water distribution pipe and providing an air valve at the upper end of the pumping pipe for releasing the air accumulated in the pipe;
Reducing the water pressure of the water main to the required water pressure with the pressure reducing valve,
Construction of the water main direct connection type water supply apparatus characterized in that the required water pressure is set to the same level as the water pressure of the water supply section on the uppermost floor of the building, which was obtained in the water tank utilization type water supply apparatus Method.

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