JP6570358B2 - Existing line lining method - Google Patents

Description

  The present invention relates to a method for lining an existing pipeline, and in particular, when a relatively rigid lining material made of a thermoplastic resin is drawn into the existing pipeline such as a sewer pipe, the lining material is heated. The present invention relates to a method of preventing an excessive expansion in a manhole and securing a work area when expanding.

  As a method for facilitating the work in the manhole in the method of pulling the lining material into the existing pipe line, a method described in JP-A-3-230941 is known.

  In this method, a lining material is drawn into an existing pipeline, and the surplus end portion of the lining material is raised in the manhole and pulled out to the ground, and the rising portion of the lining material is covered with a protective cylinder for preventing overexpansion. This prevents overexpansion of the material.

  However, in this method, the lining material can easily expand up to the inner peripheral length of the overexpansion prevention protective cylinder, and the thickness of the overexpansion prevention protective cylinder itself and the structural thickness are also required. The work space in the manhole is limited, and the work efficiency is not improved so much.

JP-A-3-230941

  The present invention has been made in view of such circumstances, and by raising the surplus end portion of the lining material in a manhole and feeding the heated and pressurized fluid through the lining material, The object is to prevent overexpansion of the rising portion and to secure a working space in the manhole.

Thus, the present invention provides a method of installing a lining material made of a thermoplastic resin in an existing pipe line installed between manholes, and a step of inserting the lining material into the existing pipe line, A step of raising the surplus end portion of the lining material inserted into a pipe line in a manhole, and spraying mist from the outside of the lining material on the rising portion of the lining material, while lining the lining material via the raising portion A process of feeding a heated and pressurized fluid into the material, heating and expanding the lining material inserted through the existing pipe line, and closely contacting the inner surface of the existing pipe line; and feeding compressed air into the lining material And a step of cooling the lining material while maintaining a close contact state with the existing pipe line.
In the present invention, it is preferable that the mist is sprayed in a concentrated manner on the lower bent portion of the rising portion.

  According to the present invention, the surplus portion of the lining material is raised in the manhole, and the mist is sprayed from the outside of the lining material to the rising portion of the lining material, so that the lining material is cooled and solidified by the mist, It does not expand excessively due to the heated pressurized fluid fed inward.

  Further, since the bent portion of the lower portion of the rising portion of the lining material is cooled and solidified by fog, the lining material does not move or sink due to the pressure of the heated and pressurized fluid. Furthermore, since the cooling means is fog, there is no fear that water will collect at the bottom of the manhole, and the working environment will not deteriorate.

  However, the mist cools only the surface portion of the lining material, and does not cool the inner surface or the heated and pressurized fluid flowing through the inside. Accordingly, the heated and pressurized fluid reaches the lining material inserted into the pipe line in the heated and pressurized state, and the lining material can be sufficiently heated and expanded to adhere to the inner surface of the existing pipe line.

Center longitudinal section with lining material inserted through existing pipeline Center vertical cross section with lining material in close contact with existing pipeline

  The drawing shows a state in which the present invention is carried out. As shown in FIG. 1, a sewer pipe 2 is installed as an existing pipe line between manholes 1 and 1, and a thermoplastic resin is provided in the sewer pipe 2. A relatively rigid lining material 3 is inserted.

  The surplus end portion of the lining material 3 is raised through a bent portion 5 in the roller 4, and the upper end of the raised portion 6 reaches the upper end of the manhole 1. The other end portion of the lining material 3 is closed, and a hose 7 is attached to the closed portion, and the tip of the hose 7 is drawn out of the manhole 1 and connected to the silencer 8.

  Next, the end of the rising portion 6 of the lining material 3 is closed with a plug 9, and a heated pressurized fluid feeding pipe 10 is passed through the stopper 9, and the heated pressurized fluid feeding pipe 10 is inserted into the lining material 3. Heated pressurized fluid such as pressurized steam is fed.

  Reference numeral 11 denotes a sprayer, which sends compressed air and water from a hose 12, sprays the mist 13 in the sprayer 11, and sprays the bent part 5 and the rising part 6 of the lining material 3. Reference numeral 14 denotes a blower, which strongly blows the mist 13 sprayed from the sprayer 11 against the bent portion 5 and the rising portion 6 of the lining material 3.

  Thus, the mist 13 is sprayed by the sprayer 11, and the mist 13 is blown to the bent portion 5 and the rising portion 6 of the lining material 3 by the blower 14, while the heated pressurized fluid feed pipe 10 is heated and heated. The pressurized fluid is fed into the lining material 3.

  Thereby, at least the lower part of the rising portion 6 of the lining material 3 is cooled by touching the mist 13, and the tubular body of the lining material 3 does not expand excessively. In addition, since the bent portion 5 of the lining material 3 wound around the roller 4 is also cooled and solidified by the mist 13, the lining material 3 may move or sink due to the pressure of the heated and pressurized fluid. Absent. Furthermore, since the cooling means is the mist 13, water does not accumulate at the bottom of the manhole 1 and the working environment does not deteriorate.

  However, only the surface of the lining material 3 is cooled by contact with the mist, the inner surface of the lining material 3 is not cooled, and the heated and pressurized fluid itself passing through the inside of the lining material 3 is also cooled. Never happen.

  The heated and pressurized fluid fed from the heated and pressurized fluid feed pipe 10 passes through the rising portion 6 of the lining material 3 and also passes through the bent portion 5 wound around the roller 4, and the sewer pipe 2. The lining material 3 is inflated in the sewer pipe 2 and brought into close contact with the inner surface of the sewer pipe 2 as shown in FIG. The heated pressurized fluid such as pressurized steam fed from the heated pressurized fluid feed pipe 10 is discharged from the silencer 8 through the hose 7.

  In addition, in the upper part of the rising part 6 of the lining material 3, since the cooling by the mist 13 is not sufficiently transmitted, there is a possibility that the swell is excessively expanded. However, the work area in the manhole 1 is the bottom of the manhole 1. Even if it expands excessively in such an upper part, it does not interfere with the work.

  If the lining material 3 is sufficiently expanded and is in close contact with the inner surface of the sewer pipe 2, the lining material 3 is cooled while feeding the compressed air into the lining material 3 and maintaining the close contact with the sewer pipe 2. The lining work is completed by cutting the lining material 3 protruding from the sewer pipe 2 and appropriately processing the cut portion.

  Therefore, according to the present invention, the diameter of the lining material 3 is prevented from expanding at the lowermost portion of the rising portion 6 of the lining material 3 and most used for work, and the expansion of the lining material 3 is prevented. Therefore, it is not necessary to cover the lining material 3 with an extra material, and a sufficient work area can be secured. Moreover, since the lower part of the manhole 1 is cooled by the mist 13, the working environment is also greatly improved.

1 Manhole 2 Sewer pipe (existing pipeline)
3 Lining material 5 Bent part 6 Start-up part 13 Fog

Claims (2)

A method of lining installed manhole (1,1) existing pipeline placed between (2) within upholstery ing a thermoplastic resin (3), the lining on the existing conduit (2) in A step of inserting a material (3), a step of raising an extra end portion of the lining material (3) inserted through the existing pipe line (2) in a manhole (1), and a step of While spraying the mist (13) from the outside of the lining material (3) to the rising portion (6), the heated pressurized fluid is fed into the lining material (3) through the rising portion , A process of heating and expanding the lining material (3) inserted through the existing pipe line (2) and bringing it into intimate contact with the inner surface of the existing pipe line (2), and supplying compressed air into the lining material (3) Characterized in that it comprises a step of cooling the lining material (3) while maintaining a close contact with the path (2),設管 path method of lining The lining method for an existing pipeline according to claim 1, characterized in that the mist (13) is sprayed in a concentrated manner on the bent portion (5) of the lower portion of the rising portion (6).

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