JPH0657967B2 - Pipe cleaning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to cleaning a pipe by an air impact method for removing slime-like rust that causes red water adhering to the inside of a pipe laid in a building. Regarding construction method.

(Prior Art) As a conventional pipe cleaning method, 1) As described in JP-A-58-156386, the inside of the pipe is sealed with water from one end of a faucet or the like attached to a horizontal pipe. A method of cleaning the inside of the horizontal pipe by injecting compressed air and then opening the faucet at the end.

2) JP-A-49-116868 and JP-A-53-7
As described in Japanese Patent Laid-Open No. 2379 and Japanese Patent Laid-Open No. 60-67896, a method of washing the inside of a horizontal pipe by blowing compressed air while feeding water into the pipe and then opening a faucet at the end.

Etc. are known.

(Problems to be Solved by the Invention) However, in the former construction method, a compressed air driving device must be attached to a horizontal pipe to be cleaned which is laid for each floor. That is, it is necessary to carry out the cleaning work while moving for each floor. In addition, even if compressed air is blown from one end of the water tap of the horizontal pipe without opening the water tap at the end before cleaning, that is, the generated ultrasonic waves are attenuated in the long horizontal pipe. This is not enough to remove the slime-like rust adhering to the inside of the pipe.

In the latter construction method, it is necessary to perform cleaning work for each floor as in the former, and at the same time, it is necessary to separately install a water pump device and the like. When the speed of water supply is increased to increase the cleaning power, the diameter of the water tap at the end is usually 13A, 2
Since it is limited to 0 A, the pressure inside the pipe rises, and when compressed air is injected into this, the flow velocity of the cleaning fluid decreases, and the water supply and compressed air separate and form a two-phase flow, lowering the cleaning power. There is.

An object of the present invention is to provide a pipe cleaning method capable of cleaning the insides of horizontal pipes attached to a plurality of floors without moving the cleaning device for each floor.

(Means for Solving the Problem) A feature of the present invention is to solve the problem of the conventional method, in which one end of the horizontal draw pipe is opened and compressed air is injected from the lower part of the vertical main pipe in that state. As a result, the compressed air and the water head pressure water applied to the horizontal draw pipe are made to flow into the horizontal draw pipe to clean the inside of the pipe.

(Operation) Open the terminal water tap attached to the horizontal pipe on the upper floor and inject the compressed air intermittently in that state. The injected compressed air rises as an air mass in the vertical main pipe filled with water, reaches the upper floor, and further flows into the horizontal draw pipe.
Then, the hydraulic head pressure applied to the horizontal pipe flows in. That is, the air mass and the water head hydraulic pressure sequentially become a high-speed fluid and flow into the horizontal draw pipe, and the slime-like rust or the like is washed out and ejected from the opened end water tap.

As described above, the cleaning air mass and head pressure are sent to the horizontal pipes on each floor via the vertical pipe, so the compressed air driving device is installed on the lowest floor and the closest to the vertical pipe. The water tap at the bottom can be used as the reference driving point. As a result, the inside of the horizontal pipe of each floor can be cleaned without moving the cleaning device for each floor.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

The building has an elevated water tank 6, and a water supply pipe is laid by a vertical main pipe 2 arranged over each floor and a horizontal pipe 3 connected to the vertical main pipe 2 and arranged for each floor. . The horizontal pipe 3 on each floor is provided with a plurality of water taps 5, respectively. The compressed air driving device (cleaning device) 1 is installed on the lowest floor and is connected to a water tap 4 that is closest to the standing main pipe 2 in the horizontal pipe 3 on the lowest floor.

Next, the operation will be described. When cleaning the horizontal pipe 3 on the upper floor 8, open the water tap 5 at the end attached to it.
In that state, the compressed air 9 is intermittently injected. The injected compressed air 9 rises as an air mass in the standing main pipe 2 filled with water, reaches the position of the horizontal pipe 3 on the upper floor 8, and further flows into the horizontal pipe 3. . Then, the head pressure water 10 having a head height h that has fallen into the horizontal pipe 3 from the elevated water tank 6 flows down and flows into the horizontal pipe 3. That is, the compressed air 9 and the water head pressure water 10 that have become air lumps sequentially become high-speed running water and flow into the horizontal drawing pipe 3, and the slime-like rust and the like adhering to the inside of the pipe are washed to supply water at the end opened The cleaning wastewater 11 is ejected from the stopper 5.

When there are a plurality of water taps 5 attached to the horizontal pipe 3, the opening is defined as one and it is more effective not to open the two at the same time for the cleaning power. In addition, the head height h applied to the horizontal pipe 3
If the head water pressure of 0.7 kgf / cm ² or more is held, the compressed air 9 and the head water pressure 10 that have become air lumps sequentially flow into the horizontal drawing pipe 3 as high-speed fluid, and the cleaning power is exerted.

When cleaning the horizontal pipes 3 of other floors, the water taps 5 of the other floors are closed and the horizontal pipes 3 of the floors to be cleaned are closed.
Open the water tap of and clean in the same manner.

The above embodiment has the following effects.

1) The compressed air injection device is installed on the bottom floor, that is, the bottom water tap closest to the vertical main pipe is used as the reference injection point, so there is no need to install the compressed air injection amount for each floor, Cleaning work can be carried out without moving between floors.

2) Open the hydrant at the end attached to the horizontal pipe on the upper floor, and then inject compressed air from the lowest water hydrant closest to the vertical main pipe to remove this compressed air and the head pressure water on the horizontal pipe. Since it is used to flow into the horizontal draw pipe, it is not necessary to separately install a water pump device, etc., and slime adhered to the inside of the pipe by high-speed fluid due to the flow down / flow of compressed air and head pressure water Rust can be cleaned, work efficiency can be improved, cleaning water can be effectively used, and cleaning equipment can be simplified.

(Effects of the Invention) As described above, according to the present invention, the air mass for cleaning and the head pressure water are sent into the horizontal pipe of each floor via the vertical main pipe. There is an effect that the horizontal pipes of the specific floor and the floor above it can be easily washed while being installed on the floor, that is, without moving the washing device for each floor.

[Brief description of drawings]

 FIG. 1 is a system diagram showing an embodiment of the present invention. Explanation of code 1 …… Compressed air driving device, 2 …… Standing main pipe 3 …… Higher side horizontal pipe, 4 …… Lower water tap 5,5 ′ …… Upper water tap, 6 …… High Water tank 7 ... Bottom floor, 8 ... Upper floor 9 ... Compressed air, 10 ... Head pressure water 11 ... Washing wastewater, h ... Head height

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kiyoshi Naganuma 4-16 Nakagawa, Adachi-ku, Tokyo Inside Hitachi Elevator Service Co., Ltd. (72) Inventor Masao Hata 4-16 Higashimotocho, Kokubunji, Tokyo Tokyo Nikka Service (56) References JP 63-119893 (JP, A) JP 63-119892 (JP, A) JP 63-197732 (JP, A) JP 64-10830 (JP, A) A)

Claims (1)

[Claims] 1. A pipe constituted by a vertical main pipe laid in a building and a plurality of horizontal pipes connected to the vertical main pipe at different positions in the height direction is filled with water to blow compressed air. In the method for cleaning a pipe for cleaning the inside of the horizontal pipe by inserting it, one end of the horizontal pipe to be cleaned among the horizontal pipes of the plurality of systems is opened, and in that state, compressed air is blown from the lower part of the vertical main pipe. A method for cleaning a pipe, characterized in that the compressed air and the hydrohead pressure water applied to the inside of the horizontal draw pipe are caused to flow into the horizontal draw pipe by being introduced.