JPS6329044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for closing a seawater conduit pipe, and more specifically, in order to kill and remove organisms attached to the inner wall of a conduit pipe intended for seawater utilization.
This invention relates to a method for closing a water conduit pipe when replacing seawater in the pipe with fresh water.

As is well known, water conduit pipes intended for the use of seawater (e.g. seawater intake pipes in thermal power plants, etc.) include:
As seawater flows in and out, various organisms adhere to and accumulate on the walls of the pipe, gradually forming a colony. This reduces the inner diameter of the tube and reduces its performance.

Therefore, it is necessary to periodically remove the organisms that have adhered to the inner walls of the water conduit pipes, but conventionally, this has been mainly done by divers diving into the water conduit pipes and scraping off the organisms. However, there were problems that required a huge amount of effort and time. Therefore, it is desired to establish an effective and non-polluting removal method, and one such method is to close the headrace pipe to isolate the inside of the headrace pipe from the surrounding environment, and then remove the seawater in the closed headrace pipe from fresh water or fresh water. A method has been devised in which the attached organisms are killed by replacing them with an appropriate chemical solution, and then the attached organisms are removed.This is an extremely effective method that satisfies the above requirements, but in order to implement this method, There is a need for an effective conduit pipe sealing or closure method.

The present invention has been made in view of the above points, and the gist thereof is to arrange an inflatable closing member in a contracted state in a seawater conduit pipe, and then inflate it. A seawater headrace pipe closing method characterized by closing the seawater headrace pipe by bringing it into close contact with the inner wall of the seawater headrace pipe, and its purpose is to close the seawater headrace pipe efficiently in terms of time and labor. The purpose is to provide a method that can be used to close the system, and moreover, to provide a method that can be closed reliably. Therefore, the purpose is to enable efficient and reliable replacement of seawater in the water conduit pipe with fresh water or an appropriate chemical solution.

The present invention will be explained below based on examples. 1st
The figure schematically shows a seawater conduit pipe 1, for example, a cooling water intake pipe in a thermal power plant, with an end 2 of the conduit pipe 1 opening into seawater 3.

First, a diver dives into the sea and places the inflatable closure member 4 in the deflated state inside the tube end 2. As shown in FIGS. 2 and 3, the inflatable closing member 4 is a balloon made of a highly contractible material such as natural or synthetic rubber, and the inflatable closing member 4 made of this balloon is deflated. Insert it in the appropriate position inside the tube end 2 as it is. Also, Figures 4 and 5
As shown in the figure, this inflatable closure member 4 has a structure in which a disc-shaped closure membrane 6 is stretched inside an annular hollow body 5 made of a highly contractible material in the same manner as described above. You can also do that. This figure 4 and 5
In the case of the inflatable closure member 4 shown in the figure, latches 7, 7 are provided at diametrically symmetrical positions (upper and lower sides) on the outer periphery of the annular hollow body 5. The expandable closing member 4 can be placed inside the tube end 2 by being hooked to hooks 8, 8 installed on the upper and lower inner walls of the tube end of the water conduit tube 1.

The diver's work in the sea is only to arrange the inflatable closure member 4, and from then on, the inflatable closure member 4 can be operated and inflated from the sea or land. That is, the balloon shown in FIGS. 2 and 3 or the hollow body 5 shown in FIGS. 4 and 5 are each connected with an air pipe 9, and from the end of the air pipe 9, , inflating each inflatable closure member 4 by introducing compressed air or other gas, water or other liquid, or a mixture of these gases and liquid into the balloon or hollow body 5; Can be done.

When gas, liquid, or a mixture of gas and liquid is introduced into the inflatable closing member 4 made up of a balloon, the balloon expands radially, and its outer peripheral surface abuts the inner wall of the end 2 of the conduit pipe 1, causing the pipe to close. Close end 2.

In the expandable closure member 4 composed of the hollow body 5, vertical expansion is restricted by the disc-shaped closure membrane 6, and therefore the hollow body 5 mainly expands in the lateral direction. The outer peripheral surface is in contact with the inner wall of the tube end 2,
Close tube end 2.

Regardless of which inflatable closure member 4 is used, the outer peripheral surface that comes into contact with the inner wall of the tube end 2 can be deformed to conform to the unevenness of the inner wall. The tube end 2 is closed in a gas-tight manner even when the tube is closed.

Inflatable closure member 4 shown in FIGS. 4 and 5
In this case, the expansion direction of the hollow body 5 can be concentrated in the direction perpendicular to the tube wall, so that a particularly airtight closure can be expected. Furthermore, since the expansion volume in this case can be smaller than that of the balloon, the amount of fluid to be fed can be reduced accordingly, and work efficiency can be improved.

In the above, gas, liquid, or a mixture of gas and liquid is used as the fluid introduced into the balloon or hollow body 5, but the inflatable closing member 4
Since buoyancy is generated as the water expands, it is necessary to select the fluid to be fed in consideration of the scale of the water conduit pipe 1, installation strength, etc.

As the pipe end 2 of the headrace pipe 1 is closed by the above, the seawater in the headrace pipe 1 is replaced with fresh water or an appropriate chemical solution, and if left for a certain period of time, the inner wall of the headrace pipe 1 is closed. The life of marine organisms that have adhered to and accumulated on the water can be killed, and the inside of the water conduit pipe 1 can be cleaned easily.

In this way, according to the method of the present invention, the water conduit pipe 1
When expanded, the expandable closing member 4 disposed on the tube end 2 contacts the unevenness of the inner wall of the tube end 2 so as to conform to the irregularities, so that the tube end 2 can be reliably closed. The operation of closing the tube end 2 is simply that the diver places the inflatable closing member 4 inside the tube end 2 and then feeds fluid into the inflatable closing member 4 from the sea or the ground. Coupled with the certainty of closing the pipe end, the cleaning work of the water intake pipe can be done with less effort and time.

As described in detail above, the present invention involves arranging an inflatable closing member in a contracted state inside a seawater conduit pipe, and then inflating it and bringing it into close contact with the inner wall of the seawater conduit pipe, thereby closing the pipe. This method of closing seawater headrace pipes is characterized by
Moreover, it has the advantage of being able to be closed reliably. Therefore, the subsequent work of replacing seawater in the water conduit pipe with fresh water or an appropriate chemical solution and the removal of attached organisms can be carried out efficiently and reliably.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, and FIG. 1 is a conceptual diagram of a water conduit pipe implementing the present invention, and FIG. 2 is a partial cross-section of the water conduit pipe with an inflatable closure member in the embodiment. 3 is a partial sectional view of the water conduit pipe with the inflatable closing member inflated, and FIG. 4 is a partial cross-sectional view of the water conduit pipe with the inflatable closing member disposed in another embodiment. FIG. 5 is a partial sectional view of the water conduit pipe with the inflatable closure member inflated, and FIG. 6 is an enlarged sectional view taken along the line ``--'' in FIG. DESCRIPTION OF SYMBOLS 1... Water conduit pipe, 2... Pipe end, 4... Expandable closure member.

Claims (1)

[Claims] 1. A seawater conduit pipe characterized in that an inflatable closing member is placed in a contracted state inside the seawater conduit pipe, and then expanded and brought into close contact with the inner wall of the seawater conduit pipe to close the pipe. How to close.