JPS6122442Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvement of pipes, especially long pipe lines, through which fluid passes, and in the event that the fluid inside leaks from these pipes, the leaked fluid will be removed. In addition to preventing fluid from dispersing at the location where it leaks and directing it to other locations, the fluid leakage can be easily detected, and the leaked fluid can be collected or disposed of appropriately. This is what we provide.

The most suitable applications for this invention are:
There is a power line conduit. Generally, in a power line installation conduit, one or several power cables are passed through a steel pipe, and a coolant such as transformer oil or water is flowed into the gap between the cables to directly cool the cables. However, if the coolant leaks from the joints or corroded parts of the steel pipes, it may interfere with the cooling of high-voltage power cables, and if transformer oil or the like is used as the coolant, may contaminate groundwater or harm other underground objects.

For this reason, various ideas have been devised for joints that prevent coolant from leaking, corrosion-proofing treatments for steel pipes, and various protective layers are being installed to protect steel pipes and prevent leakage from spreading. However, the protective layer itself could be damaged by the pressure of the leaking liquid, so neither of these methods could be considered reliable.

The present invention was developed in view of the above circumstances, and involves wrapping a sheet provided with a large number of ribs along its length around the outer periphery of a tubular body such as a steel pipe, joining both edges, and connecting the ribs to the ribs. The purpose of this invention is to provide a pipe that collects leaked fluid in a predetermined place through the space between the pipe and the pipe, making it easy to detect the presence or absence of leakage, and completely preventing the spread of leaked fluid. be.

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a power line conduit, three power cables 2 are inserted into the steel pipe 1, and there is a space between the steel pipe 1 and the power cables 2. is filled with cooling liquid 3. 4 is a corrosion-resistant layer of polyethylene coated on the surface of the steel pipe 1. 5 is a flexible sheet having a large number of ribs 6 formed along its length on one side thereof, and is wound around the outer periphery of the steel pipe 1. This sheet 5 is made by molding a ribbed tube made of soft vinyl chloride resin or the like with ribs integrally molded on the inner surface of the tube by extrusion molding, and then splitting the ribbed tube in its length direction to form a ribbed tube. Form a sheet. This sheet is then wrapped around the outer periphery of the tubular body 1 so that the ribs are in contact with the tubular body 1, and both edges thereof are joined together. It is preferable that the sheet has a curved shape when the tube is formed, since this makes the operation of winding it around the tube body 1 easier.

Further, the sheet 5 may be made of solid plastic, but it may also be made of a reinforcing fabric made of woven fibers embedded within its thickness, which has the advantage of good dimensional stability and high strength. .

Reference numeral 7 denotes a layer in which a high-density polyethylene tape is tightly wound in a spiral around the outer circumference of the sheet.
This prevents it from falling off the outer periphery. Furthermore, a glass fiber tape impregnated with epoxy resin is wrapped around the outside and cured.
An FRP layer 8 is formed to strongly reinforce the entire tube, and a protective paint layer 9 of chloroprene rubber with excellent weather resistance, heat resistance, oil resistance, etc. is formed on the outermost layer.

In the present invention, a sheet 5 is wrapped around the outer periphery of the tube 1, and a large number of ribs 6 are formed on the inner surface of the sheet 5, so even if the coolant leaks from the tube 1, , the leakage liquid flows along the tube through the cavities 10 between the ribs 6 and is discharged through an outlet provided at a suitable location in the tube. Therefore, there is no risk that the leaked liquid will seep to the surface of the pipe and contaminate the surrounding area.
Since the sheet 5 itself is airtight, leakage liquid will not leak out of the sheet 5. Furthermore, even if some defect occurs in the sheet 5, the leaked liquid in the cavity 10 will flow toward the discharge port and no pressure will be applied to the leakage location, so the various protective layers on the outer layer of the sheet 5 can be protected. It will not be damaged and there is no risk of leakage liquid leaking outside the sheet 5. In addition, by attaching a detector to the outlet, you can easily determine whether or not coolant is leaking from the pipe, and if there is a leak, repair or replace the pipe in an appropriate manner. You can also. Furthermore, since the tube of this invention is wrapped around a sheet with flexible ribs, the ribs can absorb the shock from earthquakes, ground vibrations, shocks, etc., and the tube body itself will not be damaged. It also has advantages. In addition, in this invention,
Since a sheet with ribs is wrapped around the outer periphery of the tube, the sheet can be wrapped while fluid is still flowing inside the tube, eliminating the need to stop the fluid supply or cut power lines or communication lines during work. Therefore, it is extremely effective industrially.

It goes without saying that the pipe of the present invention can be applied not only to power line installation pipelines as described above, but also to gas pipes and water pipes.

Also, the coating layer etc. will vary depending on the use. In the case of power line conduits, if the pipe body 1 corrodes, not only will the cooling fluid leak. Since serious accidents such as high voltage leakage may occur, corrosion protection layer 4 and FRP
A fairly strict covering such as layer 8 is applied, but in gas pipes, water pipes, etc., the sheet 5 is directly wrapped around the outer periphery of the pipe body 1 to form layer 7 made of a high-density polyethylene film wound. It can be effective enough by itself.

Further, the sheet 5 of the present invention may have ribs 6 formed on its outer surface. However, in this case, it is necessary to further fit an airtight cylindrical body around the outer periphery of the ribs 6 so that the space 10 between the ribs 6 can be maintained airtight. Further, in this case, it is preferable that the sheet 5 is provided with a large number of fine through holes in the portion other than the ribs 6 so that the leaked fluid can flow into the cavity 10. However, such a through hole may not be provided, the sheet 5 may be made to prevent leakage, and the leaked fluid may flow into the cavity 10 only when a defect occurs in the sheet 5 as well.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of a power line installation conduit to which the present invention is applied. DESCRIPTION OF SYMBOLS 1... Pipe body, 4... Corrosion-proof layer, 5... Sheet, 6
...Rib, 7...layer of high-density polyethylene, 8...
...FRP layer, 9...protective paint layer, 10...blank space.

Claims (1)

[Claims for Utility Model Registration] 1. A flexible sheet having a large number of ribs is wrapped around the outer periphery of a rigid pipe that allows fluid to pass through the body along its length, and both edges are joined. The space between the ribs is made airtight from the outside by tightly winding a high-density polyethylene film in a spiral shape.
tube. 2. The rib is formed on the surface of the sheet that is in contact with the tube body,
The pipe set forth in claim 1 of the utility model registration claim. 3. Claim No. 3 of the utility model registration claim, characterized in that the rib is formed on the surface of the sheet not in contact with the tubular body, and an airtight cylindrical body is fitted to the outer periphery of the rib. The tube according to item 1. 4. The tube according to claim 3 of the utility model registration, characterized in that a large number of fine through holes are formed in the portion of the sheet excluding the ribs. 5. The sheet is characterized in that it is curved in the direction in which it is wound around the tube body.
The pipe set forth in claim 1 of the utility model registration claim. 6 Utility model registration claim 5, characterized in that the sheet is a flexible tube having a large number of ribs that is torn in its length direction.
Tubes listed in section. 7. The pipe body is a steel pipe,
The pipe set forth in claim 1 of the utility model registration claim. 8. The pipe according to claim 7, wherein the pipe body is a steel pipe with a corrosion-resistant layer of polyethylene formed on the outer peripheral surface thereof. 9 Utility model registration claim 1, characterized in that an FRP layer is formed by winding a glass fiber tape impregnated with epoxy synthetic resin around the outer periphery of a layer of high-density polyethylene film. Tube described. 10. The pipe according to claim 9 of the utility model registration, characterized in that a protective paint layer of chloroprene rubber is formed on the outer periphery of the FRP layer.