JPS6120411B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lining the inner surface of a pipe, such as an existing pipe for transporting fluid, with a lining tube to prevent fluid leakage.

If the inner surface of a pipe that has traditionally been buried underground corrodes and fluid leaks, or if fluid leaks due to poor connection of a pipe joint, all leakage points must be excavated from above ground to prevent leakage. Then, each leakage point is repaired by welding or filling it with adhesive. Therefore, a great deal of effort and time was required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for lining the inner surface of a pipe, which facilitates sealing operations such as repairing fluid leakage points.

FIG. 1 is a sectional view showing one embodiment of the present invention. A pipe 2 made of steel, cast iron, or synthetic resin is buried in the ground 1 for transporting fluid.
A shaft 3, 4 is excavated at a certain distance apart to expose the pipe 2 to be lined. Pit 3, 4
The exposed tube 2 is partially excised. The insertion block 5 is inserted into the tube 2. One end of a wire 6 passed through the tube 2 is fixed to the tip 5a of the insertion block 5. The other end of this wire 6 can be pulled toward the shaft 4 side by a winch 7 provided in the shaft 4. The outer diameter of the insertion lump 5 is such that when the insertion lump 5 is inserted into the tube 2, the insertion lump 5 can travel inside the tube 2, and the adhesive 10 can travel inside the tube 2 than the insertion lump 5. Select a value that will not leak to the shaft 4 side.

Next, as shown in FIG. 2, in the shaft 3, an inlet tube 8 bent upward and opened upward is fixed to the end of the tube 2. Adhesive 10 is introduced from the upper end 9 of the inlet tube 8 .

Referring to FIG. 3, a lining tube 12 made of flexible synthetic resin is inserted from the inlet tube 8.
The end of this lining tube 12 is fixed over the entire circumference of the upper end of the inlet tube 8. The lining tube 12 has an outer diameter that is approximately equal to or slightly larger than the inner diameter of the tube 2. The fact that the outer diameter of the lining tube 12 is approximately equal to the inner diameter of the tube 2 means that (a) its outer diameter and the inner diameter of the tube 2 are exactly equal; Even if the inner diameter of the lining tube 12 is smaller than the inner diameter of the tube 2, the lining tube 12 expands radially outward when the lining tube 12 is expanded, and the outer surface of the lining tube 12 can adhere to the entire inner surface of the tube 2. shall be construed as including. Inside the inlet tube 8 and the tube 2, the inner surface of the lining tube 12 is folded back to the outside to form an inverted portion 12a.

FIG. 4 is a perspective view of the lining tube 12 that has been inverted and folded back. This inverted part 12
A fluid such as compressed air is introduced into the shaft 3 from the shaft 3 side as shown by the arrow 13. Therefore, the inner surface of the lining tube 12 advances toward the shaft 4 while being folded back along the inner surface of the tube 2. As the lining tube 12 advances inside the tube 2, it simultaneously pushes the adhesive 10 and the insertion mass 5.
The adhesive 10 is applied to the inner surface of the tube 2 and the lining tube 1.
The adhesive 10 is always fully stored in the space defined by the tip 12b of the tube 2 and the rear end 5b of the insertion block 5, so that the adhesive 10 is applied to the entire inner surface of the tube 2. As the amount of the adhesive 10 gradually decreases, the distance along the tube axis between the tip 12b of the lining tube 12 and the rear end 5b of the insertion mass 5 becomes smaller, so that the adhesive 10 is constantly applied to the inner surface of the tube 2. This ensures that the entire surface is coated. Note that if the force of the lining tube 12 to push the adhesive 10 and the insertion lump 5 is insufficient, the wire 6
The inserted mass 5 may be pulled toward the shaft 4 side by the winch 7 using a winch 7. In this way, the lining tube 12 is inserted into the tube 2 and at the same time
It is adhered to the entire inner surface of the board with adhesive.

In another embodiment of the present invention, an inlet tube 8 is first connected to the tube 2, and then the insertion mass 5 is inserted into the tube 2 from the inlet tube 8, and then the adhesive 10 is introduced from the inlet tube 8. It's okay.

FIG. 5 is a sectional view of another embodiment of the invention.
In this embodiment, a pair of insertion masses 17 and 18 are provided at intervals along the tube axis, and these insertion masses 1
The adhesive 10 is stored within the interval 7,18. The insertion block 17 at the front in the forward direction (right side in Figure 9) does not leak the adhesive 10 to the shaft 4 side (right side in Figure 9).
It also has an outer diameter that allows the tube 2 to be moved. Insertion mass 18 at the rear in the forward direction (left side in Figure 9)
has an outer diameter smaller than the inner diameter of the tube 2 to such an extent that the adhesive 10 is applied within the tube 2 in a suitable layer thickness.
When the lining tube 12 for lining the inside of the pipe 2 is reversed and moves forward as shown by the arrow 19, the tip 12b of the lining tube 12
advances the penetrating mass 18, thereby removing the adhesive 10.
and the insertion mass 17 is pushed forward. Penetration masses 17 and 18
The adhesive 10 stored between the
0 can be applied to the entire inner surface of the tube 2.

Alternatively, the insertion masses 17 and 18 may be connected by a tension spring 20 to compress the adhesive 10 between these insertion masses 17 and 18 to ensure that it is applied to the entire inner surface of the tube 2. Alternatively, the insertion mass 17 may be pulled with the wire 6.

The invention can be implemented not only for the repair of a tube 2, but also for prelining a lining tube 12 within the tube 2 prior to fluid transport by the tube 2. The inlet tube 8 may be a tubular body with one end closed and an opening formed at the top.

As described above, according to the present invention, the lining tube is reversed and advanced by fluid pressure to be inserted into the tube, and at the same time, adhesive is applied to the entire inner surface of the tube, and the lining tube is attached to the inner surface of the tube. work efficiency is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view illustrating the process of introducing the insertion mass 5 and adhesive 10 into the tube 2, and FIG. 3 is an inverted lining tube. 4 is a perspective view of an inverted lining tube, and FIG. 5 is a sectional view of another embodiment of the present invention. 2... Pipe, 3, 4... Vertical shaft, 5, 17, 18... Penetration block, 6... Wire, 8... Inlet tube, 10... Adhesive, 1
2... Lining tube, 12a... Inverted part.

Claims (1)

[Claims] 1. A step of connecting an upwardly opened inlet tube to one end of a tube to be lined, a step of inserting an insertion block into the tube, and a step of gluing the insertion tube from the inlet tube into the inserted tube. The process of introducing the agent into the tube, the end of a flexible synthetic resin lining tube with an outer diameter that is approximately equal to or slightly larger than the inner diameter of the tube is fixed at the upper end of the inlet tube, and the inner surface of the lining tube is A method for lining the inner surface of a tube, comprising the steps of folding it outward, inverting it, and pressing the inverted portion toward the other end of the tube by applying fluid pressure from the one end side of the tube to push the inserted mass forward. . 2. Inserting a pair of insertion masses into the tube at intervals along the tube axis, storing adhesive within the intervals,
The end of a flexible synthetic resin lining tube with an outer diameter that is approximately equal to or slightly larger than the inner diameter of the tube is fixed at one end of the tube, and the inner surface of the lining tube is folded outward and turned over. A method for lining the inner surface of a tube, characterized by pushing the inserted mass forward while applying pressure with a fluid from one end of the tube toward the other end of the tube.