JPH01139238A - Repair of pipeline by lining - Google Patents

Abstract

PURPOSE:To make it possible to repair a pipeline by lining while permitting a gas or the like to flow through the pipeline and with only one excavation site for the work, by pressing a wedge into a trapezoid or triangular notched part provided in a repairing cylinder to enlarge the diameter of the cylinder, thereby fixing the cylinder in pressure contact with the inner surface of the pipeline. CONSTITUTION:A repairing cylinder 1 is formed by circularly curving a metallic elastic material, providing both ends of the curved material with triangular (or trapezoid) notched parts 10, and providing the notched parts 10 with wedge guides 15. A wedge 2 is provided with a curvature approximately equal to the curvature of a pipe, and is shaped substantially in conformity with a taper 10' of the notched parts 10 of the cylinder 1, the resultant taper 2' being provided with a guide 2'' to be engaged with the wedge guide 15 of the cylinder 1. The tip of the wedge 2 is engaged with the inlet of the notched part 10 of the cylinder 1; the assembly is fitted to a pressing unit 3, and is inserted to an objective position in a pipeline (a), where the wedge 2 is pressed into the notched part 10 to enlarge the diameter of the cylinder 1, thereby fixing the cylinder 1 in pressure contact with the inner surface of the pipeline (a).

Description

[Detailed Description of the Invention] [Industrial Application Field] When a problem such as a leak occurs in a pipe buried underground, such as a gas pipe, the present invention is designed to locally repair the problem from the inside. This relates to a method for repairing or reinforcing by stretching.

[Prior Art] A so-called tube inversion method is known as a method for repairing a leakage point in a gas pipe or the like from the inside.

As shown in Figure 7, this construction method involves cutting the pipeline O1 that includes the problem area in a certain section, making one side the insertion side and the other the extraction side, and applying fluid pressure into the uninverted tube 02 from the insertion side. 03 and propel the tube 02 while reversing it,
This is a method in which the end of the tube 02 is processed on the extraction side, and the tube 02 is bonded to the inner surface of the conduit O1 using an adhesive applied to the tube 02.

[Problems with the Prior Art] The above-mentioned conventional tube inversion construction method is not effective when repairing or reinforcing long sections of pipelines, and has the following problems.

80 Even in cases where local repairs are sufficient, more lining will be done than necessary.

b. It is necessary to completely shut off the gas flowing in the pipe line Of, and repair cannot be performed while the pipe is still a live pipe.

If there is a branch pipe outlet in section C9, this branch outlet will be blocked.

d. It is necessary to excavate both ends of the construction section.

The present invention has been proposed in view of these points, and proposes a method for repairing the lining of a pipeline, which allows local repair or reinforcement to be carried out while fluid such as gas is flowing, and which requires only one excavation for construction work. It is the purpose of

[Technical Means for Solving the Problems] As a means for achieving the above object, the present invention proposes the following pipe line lining repair method.

A repair cylinder made of an elastic material having a predetermined length and having a trapezoidal or triangular notch penetrating the pipe in the longitudinal direction is inserted into the pipe, and the cut of the repair cylinder inserted into the pipe is inserted into the pipe. A trapezoidal or triangular plate-like wedge having a taper approximately equal to the through-notch and a curvature approximately equal to that of the conduit is pushed into the notch, thereby expanding the diameter of the repair cylinder and crimping it onto the inner surface of the conduit. A pipe lining repair method characterized by:

[Embodiments and their effects] The method for repairing the lining of a pipeline according to the present invention will be described below based on the drawings.

First, structural examples of the repair cylinder l are shown in FIGS. 2 to 6. This repair cylinder 1 is made by bending a metal elastic material, forming triangular (or trapezoidal) notches 10 at both ends of the curve, and forming wedge guides 15 in each of the notches 10. It is a structure. Further, the wedge 2 is formed to have a curvature approximately equal to the curvature of the pipe, and its shape is approximately equal to the taper IQ' of the notch 10 of the repair cylinder l. A guide 2'' that engages with the wedge guide 15 of the repair cylinder l is formed.The repair cylinder l and wedge 2 having such a structure
is attached to the press-fitting unit 3 as shown in Fig. 1 with the tip of the wedge 2 engaged with the inlet of the notch lO of the repair cylinder l as shown in Fig. 2, and inserted into the pipe a. The repair cylinder l is inserted to the desired position, and the diameter of the repair cylinder l is expanded by press-fitting the wedge 2 here, and the repair cylinder l is crimped onto the inner surface of the conduit a.

The structure of the press-fitting unit 3 includes an air cylinder 4 as a driving source for press-fitting the wedge 2, a plurality of holding arms 7 and 7' for holding the repair cylinder 1 from the inside and outside, and a piston of the air cylinder 4. It consists of a press-fitting arm 8 for press-fitting the wedge 2 attached to the tip of the rod 11, and a guide roller 9 for smoothly inserting the press-fitting unit 3 into the conduit a.

The wedge 2 is inserted in advance into the repair cylinder 1 only at its tip end, that is, up to the stopper 13 along the wedge guide 15 provided at the end of the notch 10 of the repair cylinder 1. In this state, the repair cylinder 1 is held at one end by the holding arm 7 on the air cylinder 4 side and by 7' at the other end, and the wedge 2 is held at one end by the press-fitting arm 8 of the extended piston rod 11. It is held in place and mounted on the press-fit unit 3.

The outer surfaces of the repair cylinder l and the wedge grass are covered with a flexible sealing material 16, as shown in FIG. 5.6, in order to improve the conformability and sealability to the inner surface of the conduit a.

Once the repair cylinder 1 and wedge 2 are attached to the wedge press-fitting unit 3 as described above, insert them into the pipe a to a predetermined position, confirm the position, and then operate the air cylinder 4 to remove the piston rod 11. Pull back. At this time, the wedge 2 is compressed by the press-fitting arm 8. Cutout part 10 of the repair cylinder l
, and the diameter of the repair cylinder l is gradually expanded. When the wedge 2 is completely press-fitted and the stopper 13 reaches the stopper fixing groove 14, the repair cylinder l is completely pressed against the inner surface of the conduit a.

Once the crimping is completed, when the piston rod 11 of the air cylinder 4 is extended, the pawl 8' at the tip of the press-fit arm 8 is removed from the wedge 2, and the press-fit arm 8 is moved from the pipe line a by the action of the splinter 8''. It is pulled back from the inner surface side to the center side of the conduit a.

In this state, if you pull back the press-fit unit 3, the repair cylinder 1
The holding arm 7, which was holding the end of the repair cylinder l, comes off from the end of the repair cylinder l, and by pulling it back further, the press-fit unit 3 is recovered.

Note that during the above-mentioned lining work, fluid is flowing in the pipe line a, and this fluid passes between the press-fitting unit 3 and the repair cylinder I and reaches the downstream side. The device also has no ignition sources, so it can be used safely even if the fluid is flammable.

FIG. 3 shows an example in which the width of the wedge 2 is reduced by crossing the notches 10 of the repair cylinder 1, thereby reducing the press-fitting stroke.

Figure 6 shows a thin plate 17 on the outer periphery of the repair cylinder 1 having the structure shown in Figure 3.
The state is shown in which the outside is covered with a flexible sealing material 16.

[Effects of the present invention] As described above, the present invention press-fits a wedge into the trapezoidal or triangular notch formed in the repair cylinder to expand its diameter, thereby crimping the repair cylinder to the inner surface of the conduit. As a result, the following effects can be expected.

a. Since the repair cylinder is lined only in the areas that require repair, the time and cost for lining can be reduced, and there is no need to worry about blocking branch ports or instrument ports.

b. The lining press-fit unit can be inserted from one side of the pipe and pulled out from there, so there is no need to cut the pipe at two places and drill two working holes, reducing the number of workers and drilling. The overhead costs associated with this can be halved.

Since the C1 repair cylinder and press-fit unit do not obstruct the flow of fluid, repair work can be performed while the fluid is flowing (while the pipe is still active). Therefore, it is particularly effective in repairing city gas pipes.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of a state in which a repair cylinder is inserted into a repair point in a pipe line by a press-fitting unit, and FIG. 2 is a plan view showing the relationship between the repair cylinder and a plate-shaped wedge. Fig. 3 is a plan view showing another embodiment of the repair unit and the plate-shaped wedge, Fig. 4 is a partially enlarged sectional view taken along the p, -p: line, and Fig. 5 shows the sealing material attached to the repair cylinder and plate. A partially enlarged cross-sectional view of the state where the wedge is attached to the outside @1, Figure 6 is B
A partially enlarged sectional view taken along the line -B', and FIG. 7 is an explanatory diagram of the conventional tube reversal sealing method.

Claims (1)

[Claims] A repair cylinder made of an elastic material of a predetermined length and having a trapezoidal or triangular notch penetrating the pipe in the longitudinal direction is inserted into the pipe, and the cut of the repair cylinder inserted into the pipe is inserted into the pipe. A trapezoidal or triangular plate-like wedge having a taper approximately equal to the through-notch and a curvature approximately equal to that of the conduit is pushed into the notch, thereby expanding the diameter of the repair cylinder and crimping it onto the inner surface of the conduit. A pipe lining repair method characterized by: