JPH049595B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for lining the inner surface of a tube. If the inner surface of a pipe that has traditionally been buried underground corrodes and fluid leaks, or if fluid leaks due to a 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, it requires a great deal of effort and time. An object of the present invention is to provide a method for lining the inner surface of a pipe, which makes it easy to perform sealing operations such as repairing fluid leakage points. The present invention provides a third wire rod which is helically wound within the pipe to be lined and has a relatively large bending stiffness and torsional stiffness; and one end of a second wire rod having torsional rigidity is connected and fixed, and a first wire rod is wound spirally around the other end of the second wire rod and has lower bending rigidity and torsional rigidity than the second wire rod. one end of the first wire is fixed, an end with a fluid supply port of an inflatable and deflated bag is fixed to the other end of the first wire, and the bag is extended along the first to third wires. A flexible supply pipe is provided for supplying fluid to the bag, the first to third wires are inserted together with the bag in a contracted state, and the fluid is force-fed from the supply pipe to the bag within the pipe. and then inflating the bag to bring the bag into close contact with the inner circumferential surface of the tube, supplying lining liquid into the tube from the third wire side,
When the bag is contracted so that there is a gap between the outer circumferential surface of the bag and the inner circumferential surface of the tube, or to the extent that a gap remains between the outer circumferential surface of the bag and the inner circumferential surface of the tube. This method of lining the inner surface of a tube is characterized in that the bag is inflated and the bag is stretched by a wire while supplying lining liquid into the tube from the third wire side. Further, the present invention is characterized in that a guide member having a square front end shape is fixed to the front end of the bag. FIG. 1 is a sectional view of an embodiment of the present invention. The pipe wire passing tool 1 basically includes a longitudinal wire 1a and a bag body 61. Preferably, the guide member 5 is further included. As shown in FIG. 6, the longitudinal wire 1a extends from one end (right side in FIG. 6) to the other end (left side in FIG. 6).
The third wire 4, the second wire 3, and the first wire 2
are connected in this order, and the bag body 61 is connected to the tip. The first wire rod 2, the second wire rod 3, and the third wire rod 4 are each made of piano wire or the like, and the piano wire or the like is wound in a spiral shape. The third wire 4 has relatively large bending rigidity K3 and torsional rigidity G3, and its longitudinal length l3 is selected to be 10 m to 15 m or more in its natural state. An end 3 a of the second wire 3 is fixed to an end 4 a of the third wire 4 . The second wire 3 is the third
It has bending rigidity K2 and torsional rigidity G2 smaller than wire rod 4. The wire diameter of the second wire 3 is the third wire 4
is smaller than the diameter of the third wire material 4, and its diameter is smaller than the diameter of the third wire material 4
Therefore, it has a function of improving the wire passing rate of the pipe wire passing device 1. This second wire 3
The length l2 is selected to be approximately 0.7 m to 1.0 m, for example. The first wire 2 is attached to the tip 3b of the second wire 3.
The end portion 2a of is fixed. The first wire rod 2 is a bag body 6
When there is a guide member 5 fixed to 1, it can be bent by its own weight, and has bending rigidity K1 and torsional rigidity G1 smaller than the second wire 3. The wire diameter of the first wire rod 2 is smaller than that of the second wire rod 3, and the diameter thereof is smaller than that of the second wire rod 3. The length l1 of this first wire 2 is, for example, 7
It is selected around cm. Inside the longitudinal wire 1a is a first supply pipe 6 having flexibility for supplying pressure fluid under pressure.
2, and a second supply pipe 6 for supplying the lining liquid under pressure.
3 is inserted. At the tip of the first supply pipe 62 is a bag body 6 that can be expanded and contracted by fluid pressure.
The mouth part 61a of 1 is fixed. This bag body 61 is made of an elastic material such as rubber, and can be contracted to its original shape by releasing pressure fluid. An opening 64 is formed at the tip of the second supply pipe 63, through which the lining liquid flowing through the second supply pipe 63 is introduced into the pipe 65 to be lined. This opening 64 is arranged facing the end surface of the bag 61 on the wire rod 1a side (the right side in FIG. 1). On the free end surface 61b of the bag body 61,
Preferably, the guiding member 5 is fixed. When the guide member 5 is present, the bag body 61 can be bent by the gravity of the guide member 5, so that the bag body 61
For example, it is possible to easily enter the vertical pipe from a horizontal pipe (not shown) while rotating and vibrating. Furthermore, by fixing the guiding member 5 to the free end surface 61b of the bag body 61, the bag body 61 acts as a small spring, and therefore the wire conduction rate can be improved. FIG. 7 is a perspective view of the vicinity of the guide member 5. The guiding member 5 fixed to the free end surface 61b of the bag body 61 is
It has a square surface 6 when viewed from the free end side (left side in FIG. 7), that is, from the front, and is partially formed into a prismatic shape. The guide member 5 is made of a material such as steel, and the length l4 of one piece including the tip end face 6 is selected to be about 11 mm, for example. By applying a rotational force to the third wire 4, the guiding member 5 accumulates stress against torsion in the pipe, and when the load falls below a certain level, it can rotate and vibrate due to the reaction, and can be reused. I can also bear it. FIG. 8 shows a bag body 61, a first wire rod 2, a second wire rod 3,
It is a graph showing the relationship between the length direction l of the third wire 4 and the bending rigidity K and torsional rigidity G. Each bending rigidity K0, K1, K2, K3 of the fixed end portion 4a of the bag 61, the first wire rod 2, the second wire rod 3, and the third wire rod 4 to the second wire rod 3, and the other end portion 4b of the third wire rod 4 ,K
4, the relationship of the first equation holds true as shown by the solid line 8 in FIG. K0<K1<K2<K3<K4...(1) Also, the bag body 61, the first wire rod 2, the second wire rod 3, the third
Each torsional rigidity G0, G1, G2 of the fixed end 4a of the wire 4 to the second wire 3 and the other end 4b of the third wire 4,
As shown by the solid line 9 in FIG. 8, the relationship of the second equation holds true for G3 and G4. G0<G1<G2<G3<G4...(2) The quenching of the strands is different in the vicinity of the fixed end 4a of the third wire 4 and the second wire 3, and in the vicinity of the other end 4b. Therefore, from the end 4a to the other end 4b
bending stiffness K3 and torsional stiffness G3 as
are configured to gradually increase, as shown by solid line 8 in FIG. 8 and solid line 9 in FIG. 8, respectively. In addition, the bending rigidity K3 of the third wire 4
and the torsional stiffness G3 is expressed by the dashed dotted line 1 in FIG.
0, two-dot chain line 11 and one-dot chain line 1 in FIG.
2. As shown by two-dot chain lines 13, the size may be increased stepwise. By configuring the bending rigidity K and the torsional rigidity G to gradually increase from the bag body 61 to the other end of the third wire 4, the wire passing rate of the in-pipe wire passing tool 1 is improved. can do. When lining a pipe 65 buried underground that transports a fluid such as city gas, the longitudinal wire 1a of the in-pipe wire passage device 1 is lined inside the pipe 65 together with the first supply pipe 62 and the second supply pipe 63. Insert it in the direction of arrow A shown in FIG. When inserting this intra-pipe wire passing device 1 into the pipe 65, no pressure fluid is supplied to the bag body 61. When the bag 61 reaches the first position indicated by reference numeral 68 in the area W of the tube 65 to be lined, the first supply tube 62 is connected to a source (not shown) for pumping a ground pressure fluid. A pressure fluid, such as compressed air, is supplied from the As a result, compressed air is introduced into the bag 61 and it expands. Therefore, the outer circumferential surface of the bag 61 is in airtight contact with the inner circumferential surface of the tube 65, as shown in FIG. The tube 65 is thus closed. Thereafter, lining liquid is supplied to the second supply pipe 63 from a supply source (not shown) installed on the ground for pumping lining liquid. In this way, as shown in FIG. 3, the required amount of lining liquid is introduced into the tube 65 from the opening 64 of the second supply tube 63. As a result, the lining liquid storage portion 6 is formed on the end surface (right side in FIG. 3) of the bag body 61 facing the wire rod 1a side.
9 is formed. Then, the pressure fluid inside the bag 61 is slightly released, and the bag 65 contracts to have an outer diameter slightly smaller than the inner diameter of the tube 65. After that, insert the in-pipe wire passing tool 1 into the fourth
Pull it back in the direction shown by arrow B in the figure. At this time, the lining liquid is extracted from the annular gap between the inner peripheral surface of the tube 65 and the outer peripheral surface of the bag body 61. As a result, the lining liquid is applied to the pipe 65 over the area W to be lined with an appropriate layer thickness. By applying the lining liquid to the inner circumferential surface of the tube 65 to form the lining layer 80 in this manner, leakage of the fluid transported within the tube 65 can be reliably prevented. FIG. 5 is a sectional view of another embodiment of the invention.
FIG. 5 is similar to the structure of FIG. 4, and corresponding parts are given the same reference numerals. L-shaped bent tube 71
In this step, the tube wire passing tool 1 is inserted in the direction shown by the arrow 72, and then pulled back in the direction shown by the arrow 73 while lining the inner surface of the tube 71. In this way, the lining can be reliably performed according to the shape of the pipe to be lined, so that the practicality is improved. Furthermore, as another embodiment, it is also possible to adopt a configuration in which the lining liquid is directly poured into the pipe 71 without using the second supply pipe 63 that pumps the lining liquid. Referring to FIG. 9, a chi 15 is connected to the upper part of the underground pipe 14. A ground pipe 17 is connected to this chi 15 from a service pipe 16, and a house 18
gas is supplied to the A pipe joint 19, an elbow 20, and a valve 21 are interposed between the lead-in pipe 16 and the standpipe 17. According to the in-pipe wire passing tool 1 according to the present invention, the guide member 5 can enter the underground pipe 14 from these standpipes 17 via the lead-in pipe 16. FIG. 10 shows the state in which the pipe wire passing tool 1 enters the chi 15 from the lead-in pipe 16. The bag body 61 and the first wire rod 2 are bent by the gravity of the guiding member 5, so that the guiding member 5 can easily advance from the chi 15 into the underground pipe 14. This bag body 6
1 and the first wire rod 2 are hanging down due to the gravity of the guiding member 5, the guiding member 5 is rotated by pushing the third wire rod 4 while rotating the third wire rod 4 around its axis. It is possible to enter the underground pipe 14 while vibrating. Further, as shown in FIG. 11, the end of the tube 23 is closed with a plug 22.
Even when a branched pipe 24 is connected near pipe 2, the in-pipe wire passing tool 1 according to the present invention can be inserted into pipe 23 or pipe 24 as shown by arrow 25,
Conversely, tube 24 can enter tube 23 as indicated by arrow 26. The leading end surface 6 of the guiding member 5 is square.
Therefore, the corner portion 6a of the tip end surface is likely to get caught in a step at an elbow, a tee, a pipe joint, or the like. By the corner portion 6a catching on the step inside the tube, the bag body 61, the first wire rod 2,
It bounces due to the elastic force and torsional force of the second wire 3 and the third wire 4, respectively. This allows the guide member 5 to enter the pipe while climbing over the step. Table 1 shows the experimental results of the inventor.

[Table] When the first wire rod 2, the second wire rod 3, and the third wire rod 4 made of the materials shown in Table 1 were used to wire the gas pipe shown in FIG. Wire 1 is connected to lead-in pipes 40 to 50 connected in a zigzag manner from ground pipe 28 through elbows 29 to 39.
I was able to reach the inside of the main pipe 42 from Qi 41 by entering the inside. In this way, when I ran wires inside various gas pipes using the subject pipe wiring tool 1, I found that it was approximately 92~
It was confirmed that the wire can be connected with 100% probability, the success rate is extremely high, and the time required to connect the wire is relatively short. The in-pipe conduit according to the present invention is capable of passing not only underground gas pipes, but also other pipes installed in the wall of a building or other hidden parts, or exposed pipes. Good too. Alternatively, the end portion 4b of the third wire 4 of the intra-tube wire threading tool may be rotated around the axis using, for example, a pistol-shaped tool to feed the intra-tube wire threading tool into the pipe. As another embodiment of the present invention, the first wire 2, the second
The wire rod 3 and the third wire rod 4 are wound inside and outside 2 in opposite directions.
It may be configured by a coil spring having a heavy structure, and the first wire 2, the second wire 3, and the third wire 4
may be made of different materials. In the above-mentioned embodiment, after the bag 61 was expanded in the tube to seal the tube, the lining liquid was supplied into the tube from the wire 1a side, and then the bag 61 was pulled back in a contracted state. However, after inflating the bag 61 to such an extent that a gap remains between its outer circumferential surface and the inner circumferential surface of the tube, the bag 61 is pulled back while supplying lining liquid into the tube from the wire 1a side to a predetermined thickness. The lining layer may be formed on the inner circumferential surface of the tube. As described above, according to the present invention, the first wire rod, the second wire rod
Using an intra-pipe wire passing tool consisting of a longitudinal wire consisting of a wire rod and a third wire rod and a bag body that can be expanded and contracted, the bag body is easily inserted into the place in the pipe where lining is to be performed, and the bag body is expanded within the pipe to line the pipe. The lining liquid is then supplied into the tube, and the bag is then inflated either in a contracted state or to the extent that a gap remains between the outer circumferential surface of the bag and the inner circumferential surface of the tube. By stretching the bag while supplying lining liquid into the tube from the wire side, the inner surface of the tube can be efficiently lined to a predetermined thickness. Furthermore, by fixing the guide member to the tip of the bag, the wire can be passed through the tube even more easily.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the bag 61 in an inflated state, FIG. 4 is a sectional view for explaining the lining operation by the pipe wire threading tool 1, FIG. 5 is a sectional view of another embodiment of the present invention, and FIG. 6 is a side view of the pipe wire threading tool 1 according to the present invention. FIG. 7 is an enlarged perspective view of the vicinity of the bag body 61, FIG.
The figure is a piping diagram for explaining the wiring work, Figure 10 is a cross-sectional view showing the wiring state near Qi 15, and Figure 11 is a piping diagram to explain the wiring work.
The figure is a sectional view for explaining the operation of passing wires into the pipes 23 and 24, and FIG. 12 is a piping diagram of an embodiment of the present invention. 1...In-pipe wire passing tool, 1a...Longitudinal wire rod, 2...
First wire rod, 3... Second wire rod, 4... Third wire rod, 5
...Guiding member, 14,65,67...Pipe, 61...
...Bag body, 62... Supply pipe.

Claims (1)

[Scope of Claims] 1. At the end of a third wire rod which is spirally wound in the pipe to be lined and has relatively high bending and torsional rigidity, One end of a second wire having small bending stiffness and torsional stiffness is connected and fixed, and the other end of the second wire is spirally wound and has smaller bending stiffness and torsional stiffness than the second wire. One end of the first wire is fixed, an end with a fluid supply port of an inflatable and deflated bag is fixed to the other end of the first wire, and the first to third wires are A flexible supply pipe for supplying fluid to the bag is provided, the first to third wires are inserted together with the bag in a contracted state, and the fluid is force-fed from the supply pipe to the bag within the pipe. By inflating the bag body to bring the bag body into close contact with the inner circumferential surface of the pipe, supplying a lining liquid into the pipe from the third wire side,
When the bag is contracted so that there is a gap between the outer circumferential surface of the bag and the inner circumferential surface of the tube, or to the extent that a gap remains between the outer circumferential surface of the bag and the inner circumferential surface of the tube. A method for lining the inner surface of a tube, which comprises inflating the bag body and stretching the bag body by a wire rod while supplying lining liquid into the tube from the third wire side. 2. The method for lining the inner surface of a tube according to claim 1, wherein a guide member having a square front end shape is fixed to the front end of the bag.