JPH02217689A - Water stop weir for pipeline - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Detailed Description of the Invention] The present invention relates to a water stop weir for pipes used to temporarily stop water flowing through the pipes.

[Prior art]

Recently, consideration has been given to installing optical fiber cables for communication in pipelines through which sewage and the like flow. In this case, the cable connection work will be done inside the manhole located in the middle of the pipe, but when connecting the cable inside the manhole, make sure that the water flowing through the pipe does not flow into the manhole. It is necessary to dam up the

Conventionally, when water flowing through a pipe is dammed up, sandbags 3 are piled up inside the tls2 on both sides of the manhole l to dam the water 4, and the water 4 on the upstream side is pumped through the pump 5, as shown in Figure 3. The water is sucked up by the pump, and then sent to the downstream side by a hose 6. Although not shown, the water in the manhole 1 is discharged by a separate pump.

As described above, a condition is created in which water does not enter the manhole temporarily, and work can be carried out inside the manhole.

〔assignment〕

In order to temporarily dam water in the pipe, a large number of sandbags are required, and carrying these sandbags into the manhole and removing them from the manhole after work is labor-intensive and time consuming. The disadvantage is that it takes a long time.

[Means for solving problems and their effects]

In order to solve the above-mentioned problems, the present invention provides an air bank type water stop weir for pipes, and its configuration is as follows:
An external cylindrical part, an internal cylindrical part provided inside the external cylindrical part in the same direction as the external cylindrical part, and end face parts at both ends that seal between the end of the external cylindrical part and the end of the internal cylindrical part. It is characterized in that when air is introduced inside and inflated, the external cylindrical part expands to a size that comes into close contact with the inner surface of the pipe.

This cut-off weir for pipes is installed in a pipe and then inflated by blowing air until the external cylindrical part comes into close contact with the inner surface of the pipe to form a weir. The internal cylindrical portion serves as a water passageway through which water that has been dammed and accumulated on the upstream side is sent to the downstream side using a hose or the like. This cutoff weir for pipes has a small volume when no air is introduced, and is lighter than sandbags, etc., so it is extremely easy to carry it into and out of the manhole.

〔Example〕

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

Figure-Hall+1 shows one embodiment of the present invention, and this water cut-off weir 11 for pipes includes an external cylindrical part 12, an internal cylindrical part 13 provided inside it in the same direction, and the above-mentioned It is in the form of an air bag consisting of end face parts 14a and 14b at both ends that seal between the end of the outer cylindrical part 12 and the end of the inner cylindrical part 13, and each part is made of non-breathable rubberized woven fabric. It consists of etc. An air inlet/outlet port 15 with a valve is attached to one end portion 14a, and a retaining ring 16 used for retaining the water stop weir 11 is attached to the other end surface portion 14b. Also, the external cylindrical part 1
2 integrally has a sealing band 17 made of foamed rubber, foamed plastic, etc. on its outer peripheral surface. When the pipe water cutoff weir 11 is inflated by introducing air into the interior, the external cylindrical portion 12 expands to a size that brings it into close contact with the inner surface of the pipe.

Next, how to use this water stop weir 11 for pipes will be explained with reference to FIG.

This water stop weir 11 for pipes is carried into the manhole 1 with the air removed, and is installed in the pipes 2 on both sides of the manhole 1. In this state, when air is pressurized into the interior using an air pump (not shown), the entire tube expands and the outer cylindrical portion 12 comes into close contact with the inner surface of the pipe line 2, forming a water stop weir. If a rigid pipe 18 is inserted in advance into the internal cylindrical part 13 of each water stop weir 11 and the pipes 18 are connected with a hose 19, water accumulated on the upstream side can be removed. It can be discharged downstream through the pipe 18-hose I9-vibrator 18. Since the internal cylindrical portion 13 serves as a passage for water, it can also be made of a rigid pipe.

The water in the manhole 1 may be discharged by a pump (not shown). At this time, the drain pipe may be passed between the upper part of the cut-off weir 11 on the downstream side and the inner surface of the conduit 2.

If there is a possibility that the water stop weir 11 for pipes may move due to water pressure, it is preferable to install a weight 20 in the pipe line 2 and moor the water cutoff weir 11 with a wire 21.

In the above embodiment, since the inner cylindrical part 13 is provided at the center of the outer cylindrical part 12, the depth of the water 4 that accumulates on the upstream side is approximately half the inner diameter of the pipe line 2. depth,
If you need to make it shallower (or deeper) than that,
It is preferable to provide the inner cylindrical portion at a position offset from the center of the outer cylindrical portion. In this way, the stop weir 1
By rotating 1, the height of the internal cylindrical portion 13 can be adjusted, and therefore the depth of water that accumulates on the upstream side can be adjusted.

〔Effect of the invention〕

As explained above, the water stop weir for pipes according to the present invention can form a water stop weir simply by installing it inside the pipe and inflating it by pumping air. A stop weir can be constructed. In addition, this water stop weir for pipes has an internal cylindrical part, which can be used as a passageway to discharge water accumulated on the upstream side to the downstream pipe, which limits the damming time. This has the advantage of not being subject to

[Brief explanation of the drawing]

Figure 1 fat Fbl is a cutaway front view and partially cut side view of the upper half of a water stop weir for pipes according to an embodiment of the present invention, and Figure 2 shows a method for stopping water in a pipe using the same water cut weir. Explanatory drawings and diagrams shown.
3 is an explanatory diagram showing a conventional method for stopping water in a pipe. 1: Manhole, 2: Pipe line, 4: Water, 11: Water stop weir for pipe line, 12: External cylindrical part, 13; Internal cylindrical part, 14a.1
4b: End face part, 15: Air inlet/outlet with valve. Figure-2

Claims (1)

[Claims] 1. An external cylindrical part, an internal cylindrical part provided inside the external cylindrical part in the same direction as the external cylindrical part, and end face parts at both ends that seal between the end of the external cylindrical part and the end of the internal cylindrical part. A water stop weir for a pipeline, characterized in that the outer cylindrical part expands to a size that comes into close contact with the inner surface of the pipeline when the interior is inflated with air.