JPS6153219B2 - - 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 an 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.
The shafts 3, 4 are excavated so that the pipe 2 is exposed at a certain distance to be lined. Then, the pipe 2 exposed to the shafts 3 and 4 is partially cut out. In one of the shafts 3, a lining tube 5 in a flat folded state is wound into a roll and installed on a pedestal 7. The lining tube 5 is made of flexible synthetic resin such as nylon, and has a thickness of, for example, 0.2 mm. The lining tube 5 is guided by rollers 8 and 9 and immersed in a reservoir 10 of adhesive 14. As the lining tube 5 passes through the storage tank 10 of the adhesive 14, the adhesive 14 is applied to the entire outer surface of the lining tube 5. The lining tube 5 from the storage tank 10 is sandwiched between a pair of squeezing rollers 11 provided ahead of the storage tank 10 in the direction of tension of the lining tube 5, and the amount of adhesive applied on the outer surface of the lining tube 5 is is adjusted. The shaft 3 is also provided with a band-shaped covering material 12 made of flexible synthetic resin wound into a roll, and guided by rollers 13 . The cover material 12 is made up of three layers, each layer being separable from the other.

A winch 15 is provided in the other shaft 4.

When lining the tube 2, first the wire 16 is passed through the tube 2. Next, lining tube 5
is passed through the storage tank 10 of the adhesive 14 and squeezed by the squeezing roller 1.
1, the adhesive is applied to the entire outer surface of the lining tube 5 to a suitable thickness. The outer diameter of this lining tube 5 is selected to be approximately equal to or slightly larger than the inner diameter of the tube 2. Lining tube 5
The fact that the outer diameter of is almost equal to the inner diameter of tube 2 means that
The expansion of the lining tube 5 even if (a) its outer diameter and the inner diameter of the tube 2 are exactly equal, and also (b) the outer diameter of the lining tube 5 is smaller than the inner diameter of the tube 2. This should also be understood to include the fact that the lining tube 5 can sometimes expand radially outwards so that the outer surface of the lining tube 5 can adhere to the entire circumference of the inner surface of the tube 2.

The tip of the lining tube 5 coated with adhesive and the tip of the cover material 12 are connected to a wire 16 running inside the tube 2, as shown in the second figure. The cross section along the cutting area - in Figure 2 is the third
As shown in the figure. The covering material 12 is drawn in by the same length as the lining tube 5 is drawn into the tube 2. Each layer 12a of the cover material 12,
Of the layers 12b and 12c, the upper layer 12a is temporarily bonded to the lower outer surface of the lining tube 5 with an adhesive. The cover material 12 is such that when the wire 16 is pulled into the tube 2 by the winch 15, (a) the lining tube 5 is bonded to the inner surface of the tube 2 by the adhesive applied to the outer surface of the lining tube 5; Therefore, the lining tube 5 is smoothly inserted into the tube 2, and (b) the adhesive on the outer surface of the lining tube 5 is prevented from rubbing against the inner surface of the tube 2 and peeling off. In this way, the lining tube 5 is inserted into the tube 2 in a folded state. This "folded state" is not only a state in which the lining tube 5 is flattened, but also a state in which the lining tube 5 is flattened.
It must be broadly interpreted as a concept that includes the state of being bent with a crease in the longitudinal direction while remaining extended in the longitudinal direction. Lining tube 5
Inserting it into tube 2 in a folded state is as follows:
To facilitate the insertion of the lining tube 5 into the pipe 2.

After inserting the lining tube 5 and the cover material 12 into the pipe 2 from the shaft 3 to the shaft 4,
Connect the wire 16 to the lining tube 5 and the cover material 1
Remove from 2. Next, in the shaft 4, one end of the lining tube 5 is connected to the connecting tool 1 as shown in the fourth figure.
8 to prevent displacement of the lining tube 5 toward the shaft 3 (to the right in FIGS. 1 and 4).

The ends of each layer 12a, 12b, 12c of the cover material 12 on the shaft 4 side are integrally fixed to each other. Therefore, in the shaft 3, the intermediate layer 12b of the cover material 12 is pulled from the shaft 4 to the 3 side as shown by the arrow 17. As the intermediate layer 12b is pulled out into the shaft 3, the upper layer 12a and the lower layer 12c of the cover material 12 are folded and reversed, and the intermediate layer 12b and the lower layer 12c are pulled out into the shaft 3.
is drawn out. At this time, lining tube 5
Upper layer 1 with adhesive applied to the outer surface of
The back surface of 2a is bonded to the lower layer 12c. Therefore, the surface of the upper layer 12a to which the adhesive is attached is prevented from coming into contact with the inner surface of the tube 2, and the cover material 1
2 can be smoothly pulled out into the shaft 3.

Note that the cover material 12 may be pulled out into the shaft 4 by integrally fixing the ends of each layer 12a, 12b, 12c on the shaft 3 side and pulling the intermediate layer 12b toward the shaft 4 side. . A wire may be used instead of the intermediate layer 12b.

Next, referring to FIG. 5, the lining tube 5
The end on the shaft 3 side is fixed to the entire circumference of the end of the tube 2, and the insertion block 19 is inserted into the lining tube 5. When the insertion mass 19 is made of a rigid material, its outer diameter is slightly smaller than the inner diameter of the tube 2, and the insertion mass 19 fits into the tube 2 via the lining tube 5. Penetration mass 19
If it is made of an elastic material, the outer diameter of the insertion mass 19 is selected to be slightly larger than the inner diameter of the tube 2. By inserting the insertion mass 19 into the lining tube 5, the entire circumferential direction of the lining tube 5 into which the insertion mass 19 has been inserted can be adhered to the inner surface of the tube 2 by the action of the adhesive.

The insertion mass 19 has, at its rear end in the running direction 20,
A flexible exhaust pipe 21 is fixed. An exhaust hole 22 is formed at the front end of the insertion block 19 in the running direction 20, and an exhaust pipe 21 is communicated with the exhaust hole 22. The exhaust pipe 21 can be wound up and unwound by a winder 23 in the shaft 3. Exhaust pipe 21 is connected via conduit 24 to a vacuum source 25 .

The ends of the lining tube 5 and the pipe 2 on the shaft 3 side are hermetically sealed by an end plate 6. A conduit 2 is inserted into the ventilation hole 27 formed in the end plate 26.
Compressed air is sent from a blower 29 via a blower 8 . The exhaust pipe 21 passes through the end plate 26 gently. By feeding the compressed air, the insertion mass 19 travels inside the lining tube 5 from the shaft 3 side toward the shaft 4 side. Therefore, the outer surface of the lining tube 5 is adhered to the entire inner surface of the tube 2 by the adhesive applied to the outer surface. Penetration mass 1
9 reaches the shaft 4, pull the exhaust pipe 21, pull it back to the shaft 3 side, and use compressed air again to remove the inserted mass 19.
The lining tube 5 and the tube 2 may be run together, thereby ensuring the adhesion between the lining tube 5 and the tube 2.

When the insertion mass 19 travels, the inside of the lining tube 5 ahead of the insertion mass 19 in the traveling direction is exhausted by the vacuum source 25 through the exhaust hole 22 through the exhaust pipe 21 . Therefore, even if the compressed air introduced into the lining tube 5 by the blower 29 leaks forward in the running direction through a small gap between the outer surface of the insertion mass 19 and the inner surface of the lining tube 5, it will not leak from the insertion mass 19. Also, the portion of the lining tube 5 located at the front in the running direction is prevented from bulging. That is, the portion of the lining tube 5 forward of the insertion mass 19 in the running direction is always in a nearly collapsed state. Therefore, the portion of the lining tube 5 in front of the insertion block 19 in the running direction will not undesirably adhere to the inner surface of the tube 2, and the entire outer surface of the lining tube 5 will be completely covered only by the insertion of the insertion block 19. It is glued to the entire inner surface of the tube 2. This prevents the formation of a cavity between the outer surface of the lining tube 5 and the inner surface of the tube 2 after the lining is completed.

FIG. 6 is a sectional view for explaining another embodiment of the present invention. A pipe 2 is buried in the ground 1, and shafts 3 and 4 are excavated so that the pipe 2 is exposed at a certain distance to be lined. The cutting is similar to the previous embodiment. In the shaft 3, an auxiliary cylinder 35 is connected to the end of the pipe 2 by, for example, a flange. This auxiliary tube 35 has an inner diameter equal to that of the tube 2.
The inner diameter of the adhesive is approximately equal to the inner diameter of the
6.

Therefore, next, the lining tube 37 is inserted across the tube 2 and the auxiliary tube 35. The lining tube 37 is made of flexible synthetic resin such as nylon. The outer diameter of the lining tube 37 is selected to be approximately equal to or slightly larger than the inner diameter of the tube 2. The fact that the outer diameter of the lining tube 37 is approximately equal to the inner diameter of the tube 2 means not only that (a) its outer diameter and the inner diameter of the tube 2 are exactly equal, but also that (b)
Even if the outer diameter of the lining tube 37 is smaller than the inner diameter of the tube 2, the lining tube 37
This should also be understood to include that upon expansion of tube 7 , the lining tube 37 expands radially outwards so that the outer surface of the lining tube 37 can adhere to the entire inner circumference of the tube 2 .

Referring to FIG. 7, the insertion block 38 is inserted into one end of the lining tube 37 in the shaft 3. This insertion block 38 is kept stationary on the free end side of the auxiliary cylinder 35 (left side in FIG. 7) rather than the adhesive introduction hole 36. An end of an exhaust pipe 40 is fixed to the front end of the insertion block 38 in the running direction 20. exhaust pipe 4
0 is made of flexible synthetic resin and is inserted into the lining tube 37. An exhaust hole 41 is bored in the exhaust pipe 40 near the end fixed to the insertion block 38 . The exhaust pipe 40 is connected to the winder 4 in the shaft 4.
2, and this exhaust pipe 4
0 is connected to vacuum source 43 via conduit 55.
From the introduction hole 36, an adhesive 44 is introduced between the inner surface of the tube 2 and the outer surface of the lining tube 37 as shown in FIG.

Next, referring to FIG. 8, after the adhesive 44 is introduced as shown in FIG. 7, the introduction hole 36 is hermetically closed with a lid 45. The end of the lining tube 37 is fixed to the end of the auxiliary tube 35 over the entire circumference, and the ends of the tube 2 and the lining tube 37 are closed by the end plate 46 . An air hole 47 is formed in this end plate 46, and the air hole 47 is connected to a blower 49 via a conduit 48. A wire 50 is connected to the insertion block 38 by passing gently through the end plate 46. The wire 50 is wound on a reel 51. By introducing compressed air into the lining tube 37 from the air supply hole 47 by the blower 49, the inserted mass 38 moves forward in the lining tube 37 from the shaft 3 side to the 4 side in the direction of arrow 20. As the insertion mass 38 travels, the lining tube 37 is pressed against the tube 2 and the adhesive 44 flows, and the lining tube 37 is adhered to the tube 2 by the adhesive 14 accordingly.

By being exhausted from the exhaust hole 41, the portion of the lining tube 37 forward of the insertion mass 38 in the running direction is always in a nearly collapsed state. Therefore, it is ensured that the adhesive 44 flows and is applied to the entire outer surface of the lining tube 37. Therefore, the entire outer surface of the lining tube 37 is bonded to the inner surface of the tube 2 with adhesive.

The outer diameter of the insertion mass 38 is selected to a value that allows an appropriate amount of layering to exist between the inner surface of the tube 2 and the outer surface of the lining tube 37.

After the insertion mass 38 has been inserted from the shaft 3 to the shaft 4 side, the wire 50 is pulled on the shaft 3 side to pull the insertion mass 38 back to the shaft 3 side, and then the insertion mass 38 is moved again by compressed air from the blower 49. It may be run toward the shaft 4 side, and by repeating this operation, the adhesion between the lining tube 37 and the pipe 2 will be ensured. In the present invention, wire 50 may be omitted.

FIG. 9 is a sectional view for explaining still another embodiment of the present invention, and in this embodiment, FIGS.
A penetrating mass 52 is used in place of the penetrating mass 38 in the embodiment shown in FIG. What should be noted is the insertion mass 5
A flexible exhaust pipe 53 is fixed to the rear end of the vehicle 2 in the running direction 20. This exhaust pipe 53 is connected to a vacuum source on the shaft 3 side. An exhaust hole 54 is formed at the front end of the insertion block 52 in the running direction 20, and an exhaust pipe 53 is communicated with the exhaust hole 54. In this embodiment, after the insertion mass 22 is once inserted into the lining tube 37 using fluid pressure such as compressed air, the insertion mass 52 may be returned by pulling the exhaust pipe 53 toward the shaft 3. The wire 50 is not necessary. In addition, as shown in FIG. 7 of the above-mentioned embodiment, the exhaust pipe 4
This is advantageous since it is not necessary to insert the tube 0 into the lining tube 37 in advance.

Other fluids may be used instead of compressed air for moving the insertion masses 19, 38, 52. The exhaust pipes 21, 40, 53 may be rigid if they do not need to be rolled up.

The invention can be implemented not only for the repair of pipes 2, but also for prelining lining tubes 5, 37 within pipes 2 prior to fluid transport by them.

As described above, according to the present invention, after a lining tube whose entire outer surface is coated with adhesive is inserted into the tube, or an adhesive is applied between the inner surface of the tube and the outer surface of the lining tube inserted into the tube. After introduction, by moving the inserted mass forward using fluid pressure, the outer surface of the lining tube can be bonded to the inner surface of the tube 2 over the entire surface without creating a cavity, making the lining action extremely easy. , leakage points can be completely sealed over long distances. Since the inside of the lining tube is exhausted in front of the insertion lump in the running direction, the lining tube is prevented from bulging in front of the insertion lump in the running direction. Therefore, the entire outer surface of the lining tube is bonded to the entire inner surface of the tube only after the insertion block is inserted, and no cavity is created between the outer surface of the lining tube and the inner surface of the tube after lining is completed. If adhesive is introduced, it is ensured that the adhesive is applied over the entire outer surface of the lining tube.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of an embodiment of the present invention, FIG. 2 is a sectional view for explaining the process of drawing the lining tube 5 into the tube 2 together with the cover material 12, and FIG. 3 is the same as that shown in FIG. 4 is a sectional view taken along the cutting plane line -, FIG. 4 is a sectional view for explaining the process of taking out the cover material 12 from the tube 2, and FIG. 5 is a sectional view for explaining the process of bonding the lining tube 5 to the entire inner surface of the tube 2. 6 is a sectional view showing a state in which the lining tube 37 is inserted into the pipe 2 in another embodiment of the present invention, and FIG. 7 is a sectional view for explaining the step of introducing the adhesive 44. , FIG. 8 is a cross-sectional view for explaining the process of moving the insertion block 38, and FIG. 9 is a cross-sectional view of still another embodiment of the present invention. 2... Pipe, 3, 4... Vertical shaft, 5, 37... Lining tube, 14, 44... Adhesive, 16,
50... Wire, 19, 38, 52... Penetration mass,
21, 40, 53...Exhaust pipe, 22, 41, 54
... Exhaust hole, 23, 42 ... Winder, 25, 4
3...Vacuum source, 29,49...Blower, 35...
Auxiliary tube, 36... Adhesive 44 introduction hole.

Claims (1)

[Claims] 1. A step of applying an adhesive to the entire outer surface of a flexible synthetic resin lining tube having an outer diameter approximately equal to or slightly larger than the inner diameter of the tube to be lined; a step of inserting the lining tube into the tube in a folded state; a step of inserting an insertion block into the lining tube inserted into the tube from one end side of the tube; An exhaust pipe having an exhaust hole opening into the lining tube at the front evacuates the front of the inserted mass in the running direction within the lining tube, and the inserted mass is moved from one end of the tube to the other end using fluid pressure. A method for lining an inner surface of a tube, comprising the step of pushing the tube forward, expanding the lining tube radially outward, and bonding the lining tube to the entire inner surface of the tube with the adhesive. 2. Inserting into the pipe a flexible synthetic resin lining tube having an outer diameter equal to or slightly larger than the inner diameter of the pipe to be lined, and inserting the lining tube into the pipe from one end of the pipe. a step of inserting an adhesive between the inner surface of the tube and an outer surface of the lining tube at a position forward of the insertion lump on the one end side of the tube in the running direction; An exhaust pipe having an exhaust hole opening into the lining tube at the front in the running direction allows the passage of fluid to flow from one end of the tube to the other end while exhausting the front part of the inserted mass in the lining tube in the running direction. A method for lining an inner surface of a tube, comprising the steps of pushing the tube forward with pressure, expanding the lining tube radially outward, and bonding the lining tube to the entire inner surface of the tube with the adhesive.