JP2529349B2 - Rust removal method inside piping of water supply system of building - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for removing rust inside a pipe of a water supply system of a building.

[Conventional technology]

As a conventional example of this type of rust removal method, there is JP-A-59-1899.
As disclosed in Japanese Patent No. 81, there is known a method of blowing dehumidified heating air from one end of a pipe to be subjected to rust removal treatment, and removing rust inside the pipe by this dehumidification heating air flow. .

[Problems to be Solved by the Invention]

However, the above-mentioned conventional method removes rust only by the dehumidified heating air flow, which requires a long working time and requires an air flow in the pipe of 20 to 100 cm / sec, so that the scale of the device is large. There was a problem that it was shaped.

Therefore, a method of using a sand jet after drying the inside of the pipe may be considered, but in that case, there is a possibility that the sand may cause clogging of the terminal water supply pipe or the pipe that is corroded and thinned may be damaged by the sand jet. . In addition, a sand jet device, a large amount of sand, and a container for receiving the sand are required, which inevitably leads to a large-scale work.

The present invention has been made in view of such a technical background, and an object thereof is to remove the inside of the piping of the water supply system of a building, which can shorten the working time and does not require a large-scale device or a sand jet. To provide a rust method.

[Means for solving the problem]

The purpose of the above is to dry the inside of the pipe by sending hot air from the hot air generator connected to the pipe after draining the water in the pipe, and then passing high pressure water from the elevated water tank into the pipe. Achieved by

[Action]

According to the above means, the rust that has become dry and brittle is peeled off with high-pressure water, so the working time is short, and the hot air generator can be one that can dry the inside of the pipe, and the dehumidifier or pulsating flow Since a generator etc. are not required, the device does not become large.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numerals 1, 2 and 3 are floors of the building, 4 is a rooftop, 5 is a high water tank installed on the rooftop 4, 5a is a ventilation hole of the high water tank 5, and 6 is a high water tank 5. Vertical main pipes that are erected downward and have their upper ends connected to the elevated water tank 5, and 7,8,9 are branch pipes installed on the floors 1,2,3, respectively. 9 is connected to the vertical main pipe 6. 10 is a valve provided between the elevated water tank 5 and the vertical main pipe 6, 11, 12, 13 are valves provided between the vertical main pipe 6 and the branch pipes 7, 8, 9 respectively, 14,
Reference numeral 15 is a faucet attached to each of the branch pipes 8 and 9. In addition, 20 is a hot air generator that is a combination of a heater and a burner with a blower fan, 21 is a blower tube for sending hot air of the hot air generator 20, 22 is a blower tube 21 instead of the tap of the branch pipe 7 on the lowest floor.
Is an adapter for connecting. In addition, hot air generator
When attaching the blower pipe 20 and the blower pipe 21, the valve 11 is closed in advance and the branch pipe 7 is drained.

In the above structure, the rust removing work inside the vertical main pipe 6 and the branch pipes 7 to 9 is performed as follows.

First, the valve of the pump (not shown) is closed to stop the water supply to the elevated water tank 5, the ventilation hole 5a is opened, and then the valve 10 between the elevated water tank 5 and the vertical main pipe 6 is opened to branch off. Open the valves 12 and 13 of the pipes 8 and 9, and open the drain valve (not shown) usually provided on the lowest floor. As a result, the high water tank 5,
All the water inside the vertical main pipe 6 and the branch pipes 8 and 9 is discharged, and drainage is completed.

Next, after closing the valves 12 and 13 and opening the valve 11, the hot air generator 20 forcibly sends hot air into the branch pipe 7 and the vertical main pipe 6 to dry the inside of the branch pipe 7 and the vertical main pipe 6. After this, the valve 10 is closed, the valve 13 and the faucet 15 are opened, and the hot air from the hot air generator 20 is forcibly sent to the branch pipe 9, and the inside of the branch pipe 9 is also dried. Similarly, the valve 13 is closed and the valve 12 and the faucet 14 are opened, and the inside of the branch pipe 8 is also dried by the hot air from the hot air generator 20. In this way, when hot air is blown into the pipe to forcibly remove the water content in the rust crystals adhering to the inner wall surface of the pipe, the rust becomes extremely brittle and the crystals collapse to change into particles.

When the inside of the vertical main pipe 6 and the insides of the branch pipes 7 to 9 are dried in this way, the adapter 22 is removed, a tap (not shown) is attached to the branch pipe 7, and the valve of the pumping pump is opened to fill the high water tank 5 with water. .

Then, the valves 11, 12, and 13 are closed, the valve 10 is opened, and the water in the elevated water tank 5 is immediately flowed into the vertical main pipe 6 and discharged from the drain valve to the outside. As a result, the rust adhering to the inner wall surface of the vertical main pipe 6 is peeled and removed. Next, after closing the drain valve, the valve 13 is opened and the water in the high water tank 5 is made to flow into the branch pipe 9 at once, thereby removing the rust adhering to the inner wall surface of the branch pipe 9. Similarly, the rust in the branch pipes 8 and 9 is sequentially peeled and removed by flowing the water in the elevated water tank 5 all at once.

As described above, in the above embodiment, since it is not necessary to use equipment other than the hot air generator, such as a dehumidifier or a pulsating flow generator, the equipment does not become large-scale, and moreover from the high water tank 5. The high-pressure water at once is flushed away to remove rust, so the work time can also be shortened. Then, when the rust removal in the water supply pipe of the building about 20 years after construction was performed as described above, a sufficient rust removal effect was confirmed.

〔The invention's effect〕

As described above, according to the present invention, hot air is sent from the hot air generator into the drained pipe to dry it, and then high pressure water from the high water tank is passed through the pipe to remove rust. Since the structure is used, rust can be made brittle by a simple method, and since no sand jet is used, there is no concern that the pipe will be clogged or damaged, and rust removal can be done simply by flushing high-pressure water at a stretch. It is possible to obtain an excellent effect that it is not necessary to use such a device and the time required for the work can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic diagram of piping of a building for explaining an embodiment of the present invention. 5 ... High water tank, 6 ... Vertical main pipe, 7,8,9 ... Branch pipe, 20 ...
… Hot air generator.

Claims (1)

(57) [Claims] 1. A method of removing rust inside a pipe of a water supply system of a building, comprising a vertical main pipe connected to an elevated water tank and a plurality of branch pipes connected to the vertical main pipe for each floor. In, after draining the water in the pipe consisting of the vertical main pipe and the branch pipe, hot air is sent from the hot air generator connected to the pipe to dry the inside of the pipe, and then the high temperature in the pipe. A method of removing rust inside pipes of a water supply system of a building, which is characterized by passing high-pressure water from a storage tank.