JPH0343517Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a leakage prevention cover for water pipes, for example.

Conventional technology In underground water pipes, expansion joints are placed every 200 to 300 meters to release stress caused by expansion and contraction due to temperature changes, but over time water leaks occur at the expansion joints. There is. The structure of the expansion joint is such that a short pipe with a slightly larger diameter is protruded from the end of one water pipe, and the free end of this short pipe is inserted into the end of the other water pipe. A gland packing is inserted between the other water pipe and the short pipe, and this packing is tightened by a gland presser. By the way, conventionally, as a countermeasure against water leakage, a steel cylindrical cover covering the entire short pipe portion has been welded and fixed over both water pipes.

Problems that the invention aims to solve According to the conventional water leakage prevention measures mentioned above, it is necessary to carry out construction work while water continues to flow in order to avoid confusion for water users. This was an extremely difficult task. Furthermore, since both ends of the cylindrical cover are welded and fixed to the water pipe, there is a problem in that when the water pipe expands or contracts, excessive force is applied to the cylindrical cover.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a water leakage prevention cover for pipes that can solve the above-mentioned problems.

Means for Solving the Problem In order to solve the above problem, the leakage prevention cover for pipes of the present invention is a leakage prevention cover that is provided at an expansion joint between two pipes, and is provided in a way that protrudes from one end of the pipe. A flexible cover made of a waterproof material that is attached over the short pipe inserted into the free end of the short pipe and the other pipe inserted into the free end of the short pipe, and covers the gland packing part between the other pipe and the short pipe. A cylindrical body made of steel that covers the flexible cover and has one end fixed to a short pipe and the other end welded to the other pipe, and a drainage nozzle provided on the flexible cover. It is composed of

Effects In the configuration of the present invention described above, since the flexible cover can temporarily prevent water from leaking to the outside, the work of welding the steel cylindrical body to the pipe side becomes extremely easy. In addition, since the cylindrical body is welded to the short pipe and the water pipe, expansion and contraction deformation of the water pipe is also absorbed by the short pipe, so that less unreasonable force is applied to the cylindrical body. do not.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 4.

Reference numeral 1 designates an expansion joint that connects the water pipes 2A and 2B in an expandable manner.A short pipe 3 with a slightly larger diameter is protruded from the end of one water pipe 2A, and a short pipe 3 with a slightly larger diameter is provided at the end of the other water pipe 2B. A gland packing 4 is inserted into the free end of the short pipe 3 and between the other water pipe 2B and the short pipe 3, and the gland packing 4 is tightened with a bolt 6 via a gland presser 5. ing. Therefore, the other water pipe 2B and the short pipe 3 are movable in the pipe axis direction. Reference numeral 7 denotes a water leakage prevention cover according to the present invention provided on the expansion joint 1, and is installed across the short pipe 3 and the other water pipe 2B, and is installed between the other water pipe 2B and the short pipe 3. A flexible cover 8 made of a waterproof material covers the entire circumference of the 4 parts of the gland packing, and covers this flexible cover 8, and one end is welded to the short pipe 3 and the other end is welded to the other water pipe 2B. It is composed of a fixed cylindrical body 9 made of steel and a drainage nozzle 10 provided on the flexible cover 8. As shown in FIGS. 3 and 4, the flexible cover 8 is attached to a rectangular cover body 11 made of a waterproof material such as rubberized cloth, and to opposite end edges of the cover body 11. The cover main body 11 is composed of a fastener 12, latches 13 attached at a plurality of places close to both end edges thereof, and metal bands 14 for tightening and fixing both side edges of the cover main body 11. In addition, since this cover body 11 covers the entire circumference of the expansion joint 1, its length is made to correspond to the circumference length of the water pipe 2A and the short pipe 3, and its width is made to cover the entire circumference of the expansion joint 1. Further, the central portion thereof is configured to bulge outward so as not to interfere with the gland presser 5 portion and to guide water leakage to the drainage nozzle 10 provided at the central bottom portion. It is formed. Further, as shown in FIGS. 1 and 2, the cylindrical body 9 has a groove-shaped cross section, and includes a cylindrical body 15 and
It is comprised of first and second annular side plates 16A, 16B fixed to the inner periphery of the side edge of the body, and an air bleed valve 17 connected to the upper part of the cylindrical body 15.
The inner diameter of the first annular side plate 16A substantially matches the outer diameter of the short pipe 3, and the inner diameter of the second annular side plate 16B substantially matches the outer diameter of the other water pipe 2B. Further, since the cylindrical body 9 is attached in the middle of the pipe, it is divided into a plurality of parts (for example, four in this embodiment) on the circumference, and the divided parts are connected to each other by an angle 18, a bolt 19, and a nut 20. It is possible to connect them.

Next, the installation work of the water leakage prevention cover will be explained.

First, the cover main body 11 is wrapped so as to cover the water leakage location, that is, the entire gland packing 4 portion, and the latch fitting 13 is attached. Next, the side edges of the cover main body 11 are positioned on the outer periphery of the short pipe 3 and the other water pipe 2B using the ropes 21, respectively. In addition,
At this time, a gasket (not shown) is inserted between the cover body 11 and each tube 3, 2B as necessary. Next, after closing the fastener 12, the band 14 is wrapped around the side edge of the cover main body 11 and fastened and fixed using a fastening fitting (not shown). Next, after arranging the divided cylindrical body 9 so as to cover the cover main body 11, the divided parts are connected to each other by bolts 19 and nuts 20. At this time, the drain nozzle 10 provided at the bottom of the cover body 11 is made to protrude from an opening (not shown) formed in the cylindrical body 9, and the drain valve 22 is connected. Next, the cylindrical body 9 is welded to the short pipe 3 and the other water pipe 2B, and the divided cylindrical bodies 9 are welded to each other. Note that water leakage during the above-mentioned work is discharged to the outside through the drain valve 22, which is closed after the work is completed. Further, the air vent valve 17 is closed after the inside of the cylindrical body 9 is completely filled with water leakage.

In the above embodiment, the cylindrical body 9 has a groove-shaped cross-section, but as shown in FIGS. 5 and 6, the cylindrical body 31 has a circular cross-sectional shape, that is, a spherical shape as a whole. It may be shaped so that it becomes part of the .

Effects of the Invention According to the configuration of the present invention described above, since the flexible cover can temporarily prevent water from leaking to the outside, the work of welding the steel cylindrical body to the pipe side becomes extremely easy. In addition, since the cylindrical body is welded between the short tube and the other tube, expansion and contraction deformation of the tube is also absorbed by the short tube, so that no excessive force is applied to the cylindrical body. .

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention.
FIG. 3 is a partially cutaway overall side view of the cover main body, FIG. 4 is a half-sectional view as viewed from FIG. 3, and FIGS. 5 and 6 are other embodiments. Fig. 5 is a side view of the whole partially cut away, Fig. 6
The figure is a view taken along the - arrow in FIG. 1...Expansion joint part, 2A, 2B...Water pipe, 3
... short pipe, 4 ... gland packing, 7 ... leakage prevention cover, 8 ... flexible cover, 9 ... cylindrical body, 10 ... drainage nozzle, 11 ... cover body,
12... Fastener, 17... Air bleed valve, 22... Water bleed valve.

Claims (1)

[Scope of utility model registration request] A leakage prevention cover installed at an expansion joint between two pipes, and installed over a short pipe protruding from one end of the pipe and the other pipe inserted into the free end of the short pipe. a flexible cover made of waterproof material that covers the gland packing between the other pipe and the short pipe; A water leakage prevention cover for a pipe, comprising a steel cylindrical body welded and fixed to the pipe, and a drainage nozzle provided on the flexible cover.