JPH0142819B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Field of Industrial Application This invention relates to a method and apparatus for lining a tube inside a pipeline with many bends while inverting it, and particularly relates to a method and apparatus for lining a tube inside a pipeline with many bends. Applicable to the lining of piping or water pipes, etc.

(2) Prior art and its problems Figure 1 shows a method of lining a gas pipe buried underground, particularly in a pipe line with many bends, by inverting the tube.

In this conventional method, a pulling body 02 such as a wire or flat steel is wound in advance into the inside-out inner lining tube 01, and this pulling body 02 is wound up by a winch 03 at the end of the inversion, and the tube 01 is oriented in a direction. This gives smooth reverse propulsion through the bend.

For this reason, as is clear from Fig. 1, it is necessary to excavate a working hole 04 on the end side of the reversal, and this involves trouble and expense, as well as traffic obstruction in the case of roads, etc. It required one worker to operate the system, and improvements were requested.

(3) Purpose of the present invention The present invention is proposed in response to the above-mentioned needs, and is capable of inverting a tube into a conduit with many bends only from the inversion start end without using a puller or a winch. The purpose is to propose a method that can be used and inverted derivatives that can be used in implementing this method.

(4) Structure of the present invention In order to achieve the above object, the present invention fixes the terminal end of an inverted tube to the inversion start end of the conduit, and then applies fluid pressure inside the tube to invert the tube into the conduit. At the same time, while reversing the
A flexible tip guide is inserted into the tube, and at a bend in the conduit, the tip guide guides the inverted portion of the tube in the bending direction.

Further, the configuration of the tip guide used in the above method includes a flexible tip member rotatably connected to the tip of a flexible elongated body, and a guide member attached to the tip of this tip member. A flexible tip member is rotatably connected to the tip of a flexible hollow elongate body, and a ring-shaped guiding member is attached to the tip of the tip member, which is passed through the hollow elongate body. The tips of two drawstrings are tied to the free end side of the tip member, and the direction of the guide member can be freely changed by pulling the drawstrings at one end of the hollow elongated body. There are two ways.

(5) Embodiment Figure 2 shows the method of the present invention, in which the terminal end of the lining tube 2 that has been turned inside out and rolled up inside the reversing machine 1 is fixed to the reversing start end 4 of the conduit 3, and Fluid pressure is applied by the machine 1 to invert the tube 2 into the conduit 1, and the tube 2 is lined within the conduit 1. In the present invention, when performing the above reversal operation, at the same time, the tip guide 5 as shown in FIG. 3 is inserted into the tube 2, and the tip of the tube 2 is pushed from the rear side (inside) as shown in FIG. This pushing action gives free directionality to the tube 2.

To explain the configuration of the tip guide 5 in more detail,
This tip guide 5 is a long body 6 constructed by inserting a coil spring 8 into a plastic tube 7.
Following this elongated body 6, a connecting portion 10 is rotatably attached.
It consists of a coil (tip member) 9 with a camber connected to it, and a ring (guiding member) 11 with different cross-sectional sizes attached to the tip of the coil 9, as shown in Fig. 4. It is inserted into the tube 2 from the reversing machine 1 side, and the annular body 11 contacts the tip of the tube 2 from the inside, and by pushing the elongated body 6, it gives a force to advance to the tip of the tube 2, and at the same time at the bending part. It gives the direction of bending.

FIG. 5 shows the relationship between the tube 2, which advances while reversing its straight tube portion, and the tip guide member 5, and the coil 9 of the tip guide member 5 advances with its warp extended due to the force from the conduit. When this progress is applied to the bent pipe section, it is not known which direction the annular body 11 faces, that is, the direction in which the coil 11 is warped, so for example, as shown in FIG.
The direction of the warp may be directed toward the outer circumference of the curved pipe portion. In such a case, even if the elongated body 6 is pressed, the annular body 11 would normally be strongly pressed against the inner wall on the outer circumferential side at the curved pipe portion and would not try to bend, but in the present invention, the coil 9 and the elongated body Since the freely rotating connecting portion 10 is provided between the coil 9 and the ring body 6, the linear force applied to the coil 9 is transferred to the ring body 11.
When the ring body 11 slides slightly along the bend, the warp of the coil 9 acts to cause the ring body 1 to slide slightly.
1 is rotated in the bending direction of the curved pipe section with low resistance.
As a result of this action, as shown in FIG. 7, the side of the ring body 11 with a larger cross section (the side where it joins with the coil 9) is shifted outward, giving directionality to the tube 2, and the tube 2 becomes a curved pipe. This is a process in which parts are reversed. In addition, when coupling the ring body 11 and the coil 9,
It is desirable that this connecting portion be a part of the ring body 11 that has a large cross section, and that the ring body 11 be bent in the warp direction of the coil 9. However, the ring body 11 is connected to the conduit 3.
If there is no step formed by mechanical joints or burrs inside, the same cross section may be used.

FIG. 8 shows another embodiment of the tip guide 5, in which a coil 9 without warping is used, and instead, two strings 12 are tied to the ring body 11.
This string 12 is passed through the hollow elongated body 6, and by pulling the string 12 on the opposite side of the elongated body 6, the ring body 11 and the coil 9 are bent as shown in FIG. 10 to give directionality. If the direction is to be fixed, the string 12 may be held down with the fixing bolt 13. FIG. 9 shows an example of how the string 12 is tied to the ring body 11.

FIG. 11 shows the state of the ring body 11 and the coil 9 before pulling the string 12. Simply pushing the elongated body 6 causes only a linear force to act on the tube 2, but when the string 12 is pulled, as shown in FIG. The coil 9 is bent as shown in
The ring body 11 faces in the bending direction. As a result, coil 9
Tube 2
It moves around the curved pipe part in reverse.

In addition, in the above action, if the coil 9 has a warp pattern or if the string 12 is used, the directionality may not always be achieved at once, so in such cases, the elongated body 6 should be moved in and out several degrees. Or string 12
It is necessary to try to pull it out. After several attempts, the ring body 11 should always be oriented in the bending direction.

The reversal of tube 2 progresses as described above,
Once the tube 2 has reached the end of the reversal, the only thing left to do is to pull out the tip guide 5 and work to completely adhere the tube 2 inside the conduit 3, and then insert a cutter with a heater, for example, from the end of the reversal start. is inserted, and the tip of the tube 2 is cut by fusing to make a hole and open the inside of the conduit 3, and the work is completed.

(6) Effects of the present invention a The tip guide is inserted into the tube, and while pushing the tip of the tube from the inside, it gives bending directionality to the tube at bends. Even in such cases, there is no need to use a puller to pull the vehicle from one side.

Therefore, in the tube reversal lining method for a conduit with many bends, there is no need to drill a working hole at the end of the reversal.

b. In the tip guide, when the elongated body is made of a flexible material, the tip member is rotatably connected to the elongated body, and the tip member is warped,
Due to this curvature and rotatable coupling action, the ring body can easily be oriented in the bending direction by moving the long body in and out once or twice.

(c) When the rings have different cross-sectional sizes and the tip member is connected to the larger cross-sectional area, it is possible to easily get over the step in the conduit.

d) By attaching a string to the annular body and pulling the string on the opposite side of the elongated body, the uncurved tip member can be forcibly bent to give directionality to the annular body.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional tube inversion lining method for a conduit with many bends, Fig. 2 is an explanatory diagram of the method of the present invention, Fig. 3 is a perspective view of the tip guide, and Fig. 4
Figures 7 to 7 are explanatory diagrams of the lining method of the present invention, Figure 8 is another embodiment of a tip guide that uses a string to provide directionality, and Figure 9 is a perspective view showing an example of the position where the string is tied to the ring body. , FIGS. 10 to 12 are explanatory diagrams of the operation of the tied tip guide. 1...Reversing machine, 2...Tube, 3...Pipeline,
5... Tip guide, 6... Long body, 9... Tip member, 11... Ring body, 12... String.

Claims (1)

[Claims] 1. The terminal end of the tube that has been turned over is fixed to the reversal start end of the tube, and then fluid pressure is applied inside the tube to propel the tube into the tube while turning it upside down. A flexible tip guide is inserted into the tube, and at the curved portion of the conduit, this tip guide guides the inverted portion of the tube in the bending direction, and the tube is lined while being inverted into the conduit that has many bends. Method. 2. A flexible tip member is rotatably connected to the tip of a flexible elongated body, and a guide member is attached to the tip of this tip member, and the tube is inverted into a conduit with many bends. Tip derivatives used in the method of lining while. 3. The tip guide according to claim 2, wherein the tip member is a coil and the coil is warped. 4. The tip guide according to claim 2, wherein the guide member comprises annular bodies having different cross-sectional sizes. 5 A flexible tip member is rotatably connected to the tip of a flexible hollow elongate body, and a ring-shaped guiding member is attached to the tip of the tip member, and the two pieces are passed through the hollow elongate body. A bent portion configured such that the tip of a drawstring is tied to the free end side of the guide member, and the direction of the guide member can be freely changed by pulling the drawstring at one end of the hollow elongated body. A tip guide used in a method of lining a tube while inverting it in a conduit with a lot of moisture.