JP2639050B2 - How to paint the inside of a bypass pipe underwater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is for repainting the inner surface of a small-diameter bypass pipe having a submerged water outlet attached to a discharge pipe of a dam or weir. The present invention relates to an internal coating method for a bypass pipe.

[Related Art] As shown in FIG. 2, a discharge pipe 2 is provided in a dam body 1 of a dam, and the discharge is performed downstream by opening a discharge gate 3 and a spare gate 4. A small-diameter bypass pipe 5 is provided to be attached to the discharge pipe 2, and the bypass pipe 5 is provided at a position lower than the lowest water level L of the dam so that the mouth 5a is always in the water.
5a is opened. 6 is the top of the dam, H
Is the high water level.

[Problems to be Solved by the Invention] However, the bypass pipe 5 generally has a diameter of 500 m.
m or less, it is difficult for humans to enter the interior, and since the mouth 5a is always in the water, it is impossible to paint inside by input. At present, the interior is left unpainted even once. For this reason, there has been a problem that the inner surface is severely corroded due to the generation of rust or the like, and a trouble occurs during use.

Therefore, the present invention is intended to make it easy to paint the inner surface of a bypass pipe that has been neglected because the drinking spout is always in the water and because it has a small diameter, repainting is conventionally impossible. It is.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a small-diameter bypass pipe provided on a levee body such that the mouth is always in the water. The other end of the temporary pipe connected to the coating device placed in the water is detachably connected in water, and then the inner surface of the bypass pipe is coated with the coating device via the temporary pipe. The method of painting the inside of a bypass pipe that is underwater.

[Operation] The temporary pipe is connected to the mouth of the bypass pipe, and the bypass pipe is painted from above the water surface through the temporary pipe. Therefore, even if the mouth of the bypass pipe is underwater, and the diameter of the bypass pipe is small, The interior can be easily coated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment in which the coating method of the present invention is applied to a bypass pipe provided in a dam embankment. Therefore, as shown in FIG. Is provided, and the opening 5a of the bypass pipe 5 is opened at a position below the lowest water level L so as to be always in the water. The coating is performed by the coating device 7. More specifically, a blasting machine for cleaning the inner surface of the bypass pipe 5 and the bypass pipe 5 are provided on the ridge 6 in order to perform the repainting work of the inner surface of the bypass pipe 5.
Coating device 7 equipped with a coating machine for coating the inner surface of
Is installed so that the other end (lower end) of the temporary pipe 8 having one end (upper end) connected to the coating apparatus 7 can be detachably connected to the drinking port 5 a of the bypass pipe 5.

In FIG. 1, components denoted by the same reference numerals as those in FIG. 2 indicate the same components.

Now, when coating the inside of the bypass pipe 5, the lower end of the temporary pipe 8 is connected to the mouth 5a of the bypass pipe 5, and the bypass pipe 5 and the coating device 7 are communicated through the temporary pipe 8. And At this time, since the coating device 7 is installed on the ridge 6 above the high water level H of the dam, water in the dam does not flow into the bypass pipe 5 through the temporary pipe 8. In this state, the inner surface of the bypass pipe 5 is blast-cleaned through the temporary pipe 8 by the blast machine of the coating apparatus 7. As a result, rust generated on the inner surface of the bypass pipe 5 is removed. After a while, the coating equipment 7
Similarly, the inner surface of the bypass pipe 5 is coated via the temporary pipe 8. As a result, the inner surface of the bypass pipe 5 is repainted. After the painting work is completed,
The connection between the temporary pipe 8 and the mouth 5a of the bypass pipe 5 is disconnected, and the temporary pipe 8 is pulled up on the water surface and removed.

In the present invention, as described above, since the temporary pipe 8 is used to paint the inside of the bypass pipe 5, even if the bypass pipe 5 has a small diameter that cannot be inserted by a human,
Even when the drinking mouth 5a is underwater, the inside can be easily repainted. Therefore, it is possible to prevent a trouble at the time of use, which has been caused by rust or the like due to being conventionally left unattended.

In the above embodiment, the case where the coating device 7 is installed on the bank 6 is shown. However, the coating device 7 may be installed on a pontoon above the water surface. In the above embodiment, the dam 1
Although the case where it carried out about the bypass pipe 5 provided in was shown, it can be similarly carried out also about the bypass pipe provided in the embankment of a weir, and other within the range which does not deviate from the gist of the present invention. Of course, various changes can be made.

[Effects of the Invention] As described above, according to the method for internally coating a bypass pipe in water according to the present invention, one end of the temporary pipe is connected to a coating device using a temporary pipe, and the other end of the temporary pipe is bypassed. Since it is connected to the mouth of the pipe and paints the inside of the bypass pipe together with the temporary pipe from the position above the water surface, the mouth is always underwater, and because it is a small diameter that humans can not enter inside, Since it is impossible to apply internal coating by input, even a bypass pipe that has been left unpainted once after installation can be easily repainted, and the bypass pipe can be prevented from being damaged. Thus, an excellent effect that the life of the bypass pipe can be extended and trouble during use can be prevented is exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a dam body. 1 ... embankment body, 2 ... discharge pipe, 5 ... bypass pipe, 5a ...
Mouth, 6 ... Dike top, 7 ... Painting device, 8 ... Temporary pipe, L ... Low water level, H ... High water level.

Claims (1)

(57) [Claims] 1. The other end of a temporary pipe having one end connected to a coating device placed above the surface of the water, the other end of which is connected to the above-mentioned mouth of a small-diameter bypass pipe provided in the embankment so that the mouth is always in the water. A method for coating the inside of a bypass pipe in water, characterized in that the pipe is detachably connected at step (1), and then the inner surface of the bypass pipe is coated with a coating device via the temporary pipe.