JPH0739684B2 - How to clean the inside of the vertical main pipe - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a method for cleaning the inside of a main stand pipe for cleaning the inside of the main stand pipe provided in a building.

[Conventional technology]

Generally, in a building such as a mansion or an office building having a plurality of floors, an elevated water tank is provided at the upper part of the building, and water for drinking or the like stored in the elevated water tank is used as a main pipe. , It is designed to lead to the water tap on each floor via a branch pipe connected to this stand main pipe. When the vertical main pipes and the branch pipes are steel pipes, if they are used for a long period of time, rust occurs on the inner surfaces of the vertical main pipes and the branch pipes, often forming floating rust. If floating rust thus generated mixes into drinking water that flows in the vertical main pipe or branch pipe, it causes water pollution.In particular, if the amount of floating rust increases, the water becomes red. I call it red water. In addition, even if the inner surface of the vertical main pipe or branch pipe is lined with vinyl chloride resin, floating rust is carried along with the flow of water from the high water tank, and this floating rust gradually adheres to the inner surface of the lining. However, this attached floating rust may produce red water.

Therefore, in order to prevent water pollution due to floating rust such as the above-mentioned stand main pipe or branch pipe, it is necessary to clean the inside of these stand main pipes or branch pipes. As shown in Japanese Patent Laid-Open No. 58-156386, there has been proposed a method in which the inside of a pipe to be cleaned is filled with water and compressed air is intermittently fed, and an alternating flow of water and compressed air is generated in the pipe to be cleaned for cleaning. ing.

[Problems to be Solved by the Invention]

By the way, in the above-mentioned conventional cleaning method, as a result of an experiment by the applicant, a high-speed alternating flow with a cleaning effect can be obtained in a narrow branch pipe having a pipe diameter of about 20 mm,
In the vertical main pipe with a relatively larger diameter than this branch pipe, the compressed air that has been sent becomes a mere mass of air in the water and rises without stirring the water, so a high-speed alternate flow cannot be obtained. There was a problem that the inside of the vertical main pipe could not be washed sufficiently.

The present invention has been made in view of the actual situation in the prior art as described above, and an object thereof is to generate a tube wall film flow in the cleaning liquid in the stand main pipe, and the tube wall film flow of the cleaning liquid causes the stand main pipe to flow. An object of the present invention is to provide a method of cleaning the inside of a vertical main pipe that can cleanly and effectively clean the inside.

[Means for Solving the Problems]

In order to achieve this object, the present invention is a stand for cleaning the inside of the stand main pipe by filling the inside of the stand main pipe standing in the building with a cleaning liquid and sending a compressed gas into the stand main pipe filled with the cleaning liquid. In the main pipe inside cleaning method, a supply means for supplying a cleaning liquid into the stand main pipe and a discharge means for discharging a compressed gas in the stand main pipe to the outside are installed on the upper part of the stand main pipe, and the standing main pipe is set up with the cleaning liquid. By filling the inside of the main pipe and then continuously feeding compressed gas from the lower part of the main pipe so that the amount of compressed air is 0.4 to 0.7 in proportion to the total volume 1 in the vertical main pipe, A flow is generated, and the inside of the stand main pipe is washed by the film flow on the pipe wall.

[Action]

Since the present invention is configured as described above, air masses and water masses are alternately formed by injecting water masses into the continuously fed compressed air, and these air masses and water masses are formed into air. The rising force of the lumps causes the water to fill the inside of the standing main pipe at high speed and generate a flow that pushes the water filled in the standing main pipe back to the elevated water tank. The air mass rises up to the elevated water tank, escapes from the water surface, and is discharged into the atmosphere by the discharging means.

In addition, the above-mentioned flow due to the rise of the above-mentioned air mass is generated, and within the vertical main pipe, there is a water mass that moves up and down for every minute section, and up and down along the pipe wall surface (for example, the second
A flow in the direction of arrow A shown in the figure), and a tube wall film flow that rotates and appears. In this tube wall membrane flow, as shown in FIG. 3, the water mass rises and falls in every minute section, and the flow flows from B to B ′ with the passage of time.

〔Example〕

Hereinafter, the method for cleaning the inside of the vertical main pipe of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an essential part for explaining an embodiment of the method for cleaning the inside of a vertical main pipe of the present invention, FIG. 2 is an enlarged sectional view of the vertical main pipe shown in FIG. 1, and FIG. Explanatory diagram showing a moving example,
FIG. 4 is a characteristic diagram showing the tube wall film flow velocity in the 100A pipe, and FIG. 5 is a characteristic diagram showing the required cleaning air amount for each pipe aperture.

In the building, as shown in FIG. 1, floors 1, 2, 3 and a roof 4 are provided. Further, 5 is a high water tank placed on the roof 4, 6 is a standing main pipe that is erected below the high water tank 5, and has an upper end connected to the high water tank 5, 7.
8 and 9 are arranged on the floors 1 to 3 respectively, and the stand main pipe 6 is provided.
The branch pipes 10, 11, and 12 connected to the branch pipes are joints attached to the branch pipes 7 to 9, respectively.
Water supply taps 13 and 14 for discharging water are provided in 1 and 12, respectively. Further, 20 is a compressor for supplying compressed gas, for example, compressed air, 21 is a controller for controlling the amount of compressed air sent, 22 is a pipe for sending compressed air from the controller 21, and 23 is this pipe 22 connected to the joint 10. It is an adapter. Note that the adapter 23 is not always connected to the joint 10 of the lower floor 1, and instead of the adapter 23, a water tap (not shown) is provided. Then, the water in the elevated water tank 5 flows down through the standing main pipe 6, is guided to the joints 10 to 12 via the branch pipes 7 to 9, and the water is discharged from the water taps 13 and 14. ing.

In this embodiment, in order to clean the inside of the stand main pipe 6, first, the water tap of the lower floor 1 is removed and the adapter 23 is connected to the joint 10 so that the state shown in FIG.
With the water taps 13 and 14 closed, the branch pipes 7 to 9 and the vertical main pipe 6 are filled with a cleaning liquid, for example, water, and water is also put in the elevated water tank 5. Next, when the compressor 20 is started, the flow rate of the compressed air supplied from the compressor 20 is controlled by the controller 21, and a predetermined amount, for example, the ratio when the total volume of the stand main pipe 6 is set to 1 is 0.4 to 0.7. 2 pipes of compressed air continuously 2
2, the adapter 23, the joint 10 and the branch pipe 7 are sequentially fed into the vertical main pipe 6.

Then, in the vertical main pipe 6, as shown in FIG. 2, air masses 30a, 30b, 30c, etc. and water masses 40a, 40b, etc. alternate due to the water mass entering the continuously fed compressed air. These air masses such as 30a to 30c are formed one after another and the water mass
40a, 40b and the like ascend in the standing main pipe 6 at high speed by the rising force of the air lumps 30a to 30c, and generate a flow for pushing the water filled in the standing main pipe 6 back to the elevated water tank 5. The air mass 30a rises up to the elevated water tank 5, escapes from the water surface, and is discharged into the atmosphere from the vent hole 5a of the elevated water layer 5 in FIG.

In addition, the above-mentioned flow is generated due to the rise of the above-mentioned air masses 30a to 30c, and in the vertical main pipe 6, a water mass that moves up and down in every small section in the entire region thereof and up and down along the pipe wall surface (for example, A flow in the direction of the arrow A shown in FIG. 2) appears, and a tube wall film flow that rotates is generated. In this tube wall membrane flow, as shown in FIG. 3, the water mass rises and falls in every minute section, and the flow flows from B to B ′ with the passage of time. The vertical velocity of this tube wall membrane flow is 3 to 5 m / s, and the rotational velocity is 2 to 3 m / s. In addition, for example, a volume ratio of 0.
When 5 (a ratio of compressed air amount 1 to 1 water amount in the standing main pipe 6) compressed air is continuously fed, an air mass 30b having a length L ₁ of about 1 m and a length of about 1 m are fed into the standing main pipe 6. Water mass 40a with L ₂ of about 0.1 m
, Etc. are formed alternately, rising at high speed and water mass 40
The length L ₂ of a, etc. hardly changes, but the length L ₁ of the air mass 30b gradually increases, and the length L ₁ near the water surface with a height of 20 m.
Is about 1.6m.

In the embodiment constructed in this manner, a tube wall film flow is generated in the stand main pipe 6, and this tube wall film flow hits the floating rust adhering to the inner surface 6a of the stand main pipe 6, so that the inside of the stand main pipe 6 is cleaned. Can be done effectively.

Although compressed air is used as the compressed gas in this embodiment, other compressible gas may be used instead of this compressed air. In addition, the volume of this compressed air is set to the total volume of the main pipe 1
Was set to 0.5 (a ratio of 1 amount of compressed air to 1 amount of water), but almost the same effect can be obtained when the ratio of this compressed air is between 0.4 and 0.7.
As shown in Fig. 4, when the ratio of compressed air is less than 0.4,
It is difficult to obtain a tube wall film flow because only air lumps and bubbles rise in the vertical main pipe 6 (bubble flow, vortex region). On the other hand, above 0.7, air lumps inside the vertical main pipe 6 The compressed air rises continuously and at a high speed without forming the gas (annular spray flow, other regions), and in this case also, it is difficult to obtain a tube wall membrane flow.

Fig. 4 is for a 100A pipe, the horizontal axis is the ratio of compressed air to the total volume 1 in the vertical main pipe, the vertical axis is the pipe wall velocity (m / s), the solid line is the pipe wall vertical velocity, and the dashed line. Is the tube wall rotation velocity.

Further, FIG. 5 is a diagram showing the amount of air required to generate a tube wall film flow for each pipe diameter at a washing height of 10 m. In this figure, the horizontal axis is the pipe diameter (cross-sectional area ratio), and the vertical axis is Is the amount of air passing through the driving port (1 / s). As is clear from this figure, the tube wall film flow is generated in the region between the maximum air amount and the small air amount at each pipe diameter.

Furthermore, in this embodiment, an example in which the elevated water tank 5 is installed is shown, but in the case of a pressurizing system without an elevated water tank,
As a supply means for supplying a cleaning liquid such as water to the standing main pipe 6, a water tank or a horizontal pipe with a large diameter is temporarily installed at the upper end of the standing main pipe 6, and the inside of the standing main pipe 6 is installed in the upper part of the water tank or the horizontal pipe. It suffices to install a discharging means such as a vent for discharging the compressed air of the above.

〔The invention's effect〕

As described above, according to the present invention, the inside of the stand main pipe is filled with the cleaning liquid to store water, and then the amount of compressed air is 0.4 to 0.7 in proportion to the total volume 1 in the stand main pipe. , The pipe wall film flow is generated by continuously feeding the compressed gas from the lower part of the stand main pipe, and the inside of the stand main pipe is washed by this pipe wall film flow, so the rising force of the compressed gas itself sent to the stand main pipe. As a result, it is possible to generate a tube wall film flow in which the water mass rises and falls in every minute section and rotates and flows with the passage of time in the cleaning liquid filled in the vertical main pipe. The flow hits the floating rust adhering to the inner surface of the stand main pipe, and this floating rust can be removed from the inner surface of the stand main pipe, and the capacity of the compressor supplying compressed gas is small. Sure And it can be efficiently cleaned.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part for explaining an embodiment of the method for cleaning the inside of a vertical main pipe of the present invention, FIG. 2 is an enlarged sectional view of the vertical main pipe shown in FIG. 1, and FIG. Explanatory diagram showing a moving example,
FIG. 4 is a characteristic diagram showing the tube wall film flow velocity in the 100A pipe, and FIG. 5 is a characteristic diagram showing the required cleaning air amount for each pipe aperture. 5 ... High-place water tank (supplying means), 5a ... Vent hole (discharging means), 6 ... Standing main pipe, 6a ... Inner surface of standing main pipe, 7 ...
Branch pipe, 10 …… Coupling, 20 …… Compressor, 21 …… Controller, 22 …… Piping, 23 …… Adapter, 30a, 30b, 30c ……
Air lumps, 40a, 40b ... Water lumps, A ... Water flow down direction.

Front page continuation (72) Inventor Kiyoshi Naganuma 1-6 Kandanishiki-cho, Chiyoda-ku, Tokyo Within Niritate Elevator Service Co., Ltd. (72) Inventor Tatsuji Shiba 2-1-1, Nishishinjuku, Shinjuku-ku, Tokyo Hitachi Chemical Co., Ltd. Incorporated (72) Inventor Masao Hata 4-16-13 Higashimoto-cho, Kokubunji, Tokyo Tokyo Nikka Service Co., Ltd. (56) Reference JP-A-56-13074 (JP, A) JP-A-62-117689 ( JP, A) JP 54-152355 (JP, A)

Claims (1)

[Claims] 1. A method for cleaning the inside of a standing main pipe, wherein the inside of the standing main pipe is cleaned by filling the inside of the standing main pipe erected in a building with a cleaning liquid and feeding a compressed gas into the standing main pipe filled with the cleaning liquid. On the upper part of the stand main pipe, a supply means for supplying a cleaning liquid into the stand main pipe and a discharge means for discharging the compressed gas in the stand main pipe to the outside are installed, and the inside of the stand main pipe is filled with the cleaning liquid, , The compressed air is continuously fed from the lower part of the stand main pipe so that the amount of the compressed air is 0.4 to 0.7 with respect to the total volume 1 in the stand main pipe, and the pipe wall film flow is generated. A method for cleaning the inside of a main stand pipe, comprising cleaning the inside of the main stand pipe with a wall film flow.