JPS6059031B2 - Conduit lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves filling a pair of front and rear running objects in a pipe with a fluid sealant, and moving the objects under pressure from the open end of the pipe to apply the sealant to the inner surface of the pipe. The present invention relates to a method of lining in the form of a cylindrical membrane.

The following two types of conventional conduit lining methods are known.

One is a method of lining the fluid sealant 3 by pulling the cable 2 extending from the object running inside the pipe 1 as shown in Fig. 4A, and the other method is the same as above. As shown in J shown in the fourth port, there is a method of lining by filling a fluid sealing agent 3 between the front and rear running objects 1 and 1' in the pipe and running them under running fluid pressure. Therefore, in the former method, it is necessary to cut the conduit at both ends of its lining area, in order to pass the cable through the cable prior to towing, and in the latter method, to remove the traveling object at the end of its travel. However, the cutting work and the work of connecting the cut parts after lining require a great deal of effort, and in the case of underground pipes in particular, the soil excavation work and backfilling work lead to a significant deterioration in workability. .

In the latter method, it was considered to cut the conduit only at one end and apply pressure in the opposite direction from the source cock, etc., to push it back toward the cut point, but in this case, it was unclear to what point the traveling object had traveled. If there is a branch in the middle, reliable push-back cannot be expected, and pressure will escape outside the lining area, so it will be necessary to apply a considerable amount of pressure, which may lead to leakage or damage to equipment. It's hard to call it a solution.

The conduit lining method according to the present invention was developed in view of this problem, and is based on the above method, attaching a pullback rope to an object traveling in front of the object, and then lining the conduit over a predetermined length range. By pulling back the cable, both the front and rear running objects are discharged from the opening end.

That is, by pulling back the cable, both the front and rear running objects are discharged from the lining pressurization side open end, that is, the open end where the running object was inserted prior to the lining, so the conduit is cut only at one end of the lining range. Just do it. Furthermore, it is possible to accurately and easily confirm that both traveling objects have reached the end of the predetermined lining range by checking the retracted length of the cable.

Furthermore, even if a cable dragged by a running object disturbs the lining tube membrane during lining, the pulling back causes the running object on the front, that is, the back side, to reshape the lining tube membrane. Uniform or almost uniform lining can be performed over the entire length of the conduit and its circumference.

In addition, since it is pulled back using a cable, the work of discharging both traveling objects can be done quickly and reliably.

As described above, according to the present invention, while it is possible to perform lining with the desired properties, the cutting work is halved, the lining length can be easily confirmed, and the objects traveling on both sides can be quickly discharged.
By ensuring reliability, it has become possible to significantly improve overall workability.

The embodiment of the method of the present invention will be explained with reference to FIGS. 1 to 3. As shown in FIG. With the axial core portion slidably inserted, fluid sealant 3 is filled between the pair of front and rear running objects 1, 1, and they are inserted into the conduit P from one open end 4 thereof. By applying fluid pressure from this open end 4, both traveling objects 1, 1'', cables 2, and sealant 3 are made to travel inside the conduit P, and the sealant 3 is formed into a cylindrical film shape on the inner surface of the conduit P. I'm going to line it up. The cable 2 has a scale for detecting travel distance (not shown)
By checking this, it is determined whether lining has been performed within a predetermined length range, and when the lining has been completed, the pressure from the open end 4 is released. Running object 1,1
At the initial point of inserting the ``" into the conduit opening end 4, both 1,1"
The amount of sealing agent 3 filled in between is set to be slightly larger than the amount required for lining within a predetermined length range, thereby preventing lining leakage. Therefore, even at the end of lining a predetermined length range, a small amount of sealant 3 remains between the two running objects 1, 1''.However, due to the presence of the forward running object 1, this residual sealant 3 may exceed the lining range. After the lining is completed and the pressure is released, as shown in Fig. 2, by pulling back the cable 2 while winding it with a winch, etc. The traveling objects 1, 1'' are moved in the opposite direction and discharged from the open end 4. At this time, the rubbing marks of the cables 2 that had appeared on the tube membrane during lining were reshaped from the running object 1 on the front side, that is, on the back side. Under conditions where it is difficult to pull back the desired speed with only the pullback force applied to the cable 2, such as when the lining range is long or when the cable is bent, it is effective to apply a vacuum suction effect by reducing pressure to the open end 4. . Figures 1 and 2
In the figure, the open end 4 is located inside the excavation bit, but the open end 4 may be located on the ground as shown in FIG.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the conduit lining method according to the present invention, and FIGS. 1 and 2 are schematic cross-sectional views sequentially showing the construction procedure, and FIG. 3 is a cross-sectional view showing a case where the target pipe is different. It is. FIG. 4A is a schematic sectional view showing a conventional general lining method for CJC. 1,1″・・・Object running inside the pipe,
2... Cable, 3... Fluid sealant,
4... Open end, P... Conduit.

Claims (1)

[Scope of Claims] 1. Fluid sealing agent 3 is filled between the front and rear pairs of in-pipe running objects 1 and 1', and these are moved under pressure from the open end 4 of the conduit P to remove the sealing agent 3. This is a method of lining the inner surface of the conduit P in the form of a cylindrical film.
A cable 2 for pulling back the running object 1 is attached to the lining, and by pulling back the cable 2 after lining over a predetermined length range, both the front and rear running objects 1, 1' are discharged from the opening end 4. Characteristic conduit lining method. 2. The conduit lining method according to claim 1, wherein the method is carried out in a state where the rear traveling object 1' is slidable with respect to the cable 2. 3. The conduit lining method according to claim 1 or 2, which is carried out in a state where the cable 2 is provided with a scale for detecting travel distance. 4. The conduit lining method according to any one of claims 1 to 3, which uses vacuum suction from the open end 4 when pulling back the cable 2. 5. The amount of sealant 3 filled between the front and rear running objects 1, 1' is set to be slightly larger than the amount required for lining over the predetermined length range. The method for lining a conduit according to any one of Item 4.