JPS61245874A - Method for lining inner surface of piping - Google Patents

Abstract

PURPOSE:To efficiently perform the perfect repairing of piping, by simultaneously performing a lining treatment process and a lining layer destruction detecting process on the basis of the variation in the pressure in main branched pipe immediately after lining and a matter moving speed. CONSTITUTION:Air is quantitatively supplied in a main branched pipe 1 under constant pressure from a blower 6 and lining matter 5 is moved at an almost constant speed by air pressure and a lining material 4 is forcibly flowed by the matter 5 to coat the inner surface of the main branched pipe 1. At this time, simultaneously with the start of the movement of the matter 5, internal pressure from branched pipes 2a-2c to the main branched pipe 1 is measured by pressure measuring devices 3a-3c and the timewise variation in said pressure are recorded. When the destruction of the lining layer is present, the leakage position of the main branch pipe 1 is detected by the distance from the base point set to the inlet of the main branched pipe or the each of the connection points of the main branched pipe 1 and the branched pipes 2a-2c on the basis of the timewise variation in the measured pressure and the moving speed of the matter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention involves placing a liquid lining material and a lining object in a main pipe having a branch pipe, moving the object within the main pipe by fluid pressure, and The present invention relates to a method for displacing lining material by said object and applying it to the inner surface of said main branch.

More specifically, in the main branch pipe treated by the above-mentioned lining method, the lining layer is ruptured by the fluid pressure for moving the object, and it is detected whether there is a risk of leakage. This method relates to a method for detecting the location of damaged parts, if any, and completely repairing the pipes.

[Conventional technology]

Conventionally, there is no method to inspect whether or not the lining layer has been destroyed without lining treatment, and after the lining treatment is completed, the inside of the main branch pipe is maintained in a pressurized state, and the lining layer is inspected based on the pressure drop inside the main branch pipe. Destruction was detected.

[Problem that the invention seeks to solve]

However, since a lining treatment process and a lining layer destruction detection process are required separately, the work is cumbersome and takes a long time. As an alternative, a lot of effort,
This requires time and expense, and especially in the case of underground piping, excavation and backfilling require enormous labor, time and expense, and there is room for further improvement.

An object of the present invention is to enable detection of the presence or absence of destruction of the lining layer at the same time as the lining process, and to detect the position of the destruction with high accuracy.

[Means for solving problems]

The characteristic means of the present invention is that after a lining object that moves within the main branch pipe due to fluid pressure passes through the connection between the main branch pipe and the branch pipe, the pressure in the main branch pipe is measured by the branch pipe, and the pressure in the main branch pipe is measured. Based on the temporal fluctuation of the measured pressure and the moving speed of the object, the leakage position of the main branch pipe is detected by the distance from the connection part as the base point I/c6.The effect is as follows. .

[For production]

That is, for example, when the pressure in the main branch pipe is measured using three branch pipes and the measured pressure changes over time as illustrated in FIG. 2, the following facts become clear.

(B) During the time (1+)t/c during which the pressure measured by the first branch pipe suddenly increases from zero pressure to a constant pressure Ilc, an object passes through the connection between the main branch pipe and the first branch pipe. I know the timing.

(b) After the above time (t,), the time (t,) during which the pressure measured by the first branch pipe sharply decreased while the pressure measured by the second and eighth branch pipes remained zero. Accordingly, it is possible to determine the timing when an object passes through the leakage position between the connection portion of the first and second branch pipes in the main branch pipe.

(c) The moving speed of an object within the main branch pipe can be determined by any appropriate means, such as calculating it from the distance from the entrance of the main pipe to the connection point of the first branch pipe and the above-mentioned time (tl) K. Therefore, the distance from the connection part of the first branch pipe to the leakage point can be calculated from the difference between the times (tl) and (tt) and the moving speed of the object, and the leakage location can be accurately detected.

(d) Time when the pressure measured by the second branch pipe suddenly reached almost the same pressure as the pressure measured by the first branch pipe (ts) K
Therefore, the timing at which an object passes through the connection between the main tube and the second branch tube can be determined.

($) The pressure measured by the eighth branch pipe is the same as that of the first and second branch pipes.
The time it takes for the pressure to rise rapidly to almost the same pressure as the one measured by the branch pipe (
t4) The timing at which the object passed through the connection between the main branch pipe and the eighth branch pipe can be determined by the VC.

(to) the first and second times between the times (t,) and (t4)
Since the pressure measured by the branch pipe is almost constant, the second
It can be seen that there is no leakage within the main branch pipe between the connection part of the third branch pipe and the third branch pipe.

(g) Time when the measured pressure from all branch pipes suddenly decreased (
t, )K, the timing at which the object passed through the second leakage position on the downstream side of the connection part of the eighth branch pipe in the main branch pipe can be determined.

Further, the distance from the connection part of the eighth branch pipe to the second leakage point can be calculated from the difference between the times (t4) and (ts) and the moving speed of the object.

(H) The timing at which the object reaches the outlet of the main branch pipe can be determined by the time (t5) when the pressure measured by all branch pipes suddenly drops to zero pressure.

In short, it is not only possible to apply the lining material to the inner surface of the main branch pipe using an object, but also to detect whether or not the lining layer has been destroyed, and it is also possible to accurately detect the location of leaks due to the breakage using the connecting point of the nearby branch pipe as a reference point. .

To explain further, for example, it is possible to calculate the distance from the entrance of the main branch pipe to the leak point based on the back pressure fluctuation of the object and the moving speed of the object, but the longer the distance, the faster the object is moving. The error caused by the change is small,
It is impossible to put it into practical use in piping over long distances. However, according to the developed FJ4, by appropriately selecting the branch pipe to be measured, the distance between the reference point and the leakage point can be shortened to sufficiently reduce the error caused by changes in the moving speed of the object. Leak location can be detected with high accuracy even in long piping.

Note that if there is no variation in the measured pressure, it can be confirmed that a good lining layer has been formed.

〔Effect of the invention〕

As a result, it has become possible to simultaneously perform inner lining treatment of the pipe and inspect whether or not the lining layer has been formed satisfactorily, making it possible to carry out highly reliable lining treatment easily, quickly, and at low cost.

Furthermore, even if the lining layer is destroyed, the location of the destruction can be easily and accurately detected without the need for additional means, and repair of the damaged lining layer can be done easily, quickly, and at low cost. Overall, it has become possible to perform internal lining of pipes efficiently and at low construction costs.

In particular, for underground piping that requires excavation to repair damaged parts of the lining layer, the location of the damaged parts can be accurately detected, eliminating unnecessary excavation work and effectively improving work efficiency and reducing costs. .

[°Example]

Next, an example will be shown with reference to FIG.

As shown in FIG. 1(a)K, the buried main branch pipe (1) is excavated and cut at an appropriate position commensurate with the lining treatment area to form an opening. In addition, a suitable branch pipe (2m) connected to the main branch pipe (1), (job)
(2c) VC self-recording pressure measuring device C8m).

Set (8b) and (8c).

Then, as shown in Fig. 1 (b), an appropriate amount of liquid lining material (4) and a lining object (5) of an appropriate diameter commensurate with the inner diameter of the main branch pipe (1) and the lining thickness are added to the main branch pipe (1). 1) and the lid (5) connected to the blower (5).
7) to the main branch pipe (1) K.

After that, air is quantitatively supplied from the blower (5) into the main branch pipe (1) at a constant pressure, as shown in Fig. 1 (c).
The object (5) is moved at a nearly constant speed using air pressure, and the lining material (4) is swept away from the object (5) K, and the main branch pipe (
1) Apply to the inner surface. In addition, at the same time as the object starts moving, the pressure measuring devices (8m), (8b), C3c) detect the branch pipe (1), the branch pipe (2a), (2b),
(24:) to measure the pressure inside the main branch pipe il+ and record the temporal fluctuations in the measured pressure.

After completing the lining process for the main branch pipe 11j, the main branch pipe 5
), collect the excess lining material (4) and object +fi+, remove the lid (7) and blower (5), and remove the main branch pipe (11).
) is restored and backfilled.

Also - pressure measuring device (8m), (8b), (8c
) Considering the temporal variation of the measured pressure recorded by VC,
Check to see if there is a pressure drop due to rupture of the lining layer. If there is a breakdown of the lining layer, the leak position of the main branch pipe (11) is determined based on the temporal fluctuation of the measured pressure and the moving speed of the object, and the location of the leak is determined by the entrance of the main branch pipe (1) or the main branch pipe (1). Detection is performed by distance from the connection point of the pipe (2m) or (2b) or (2c) [For details, refer to the above-mentioned clarification based on Fig. 2].Furthermore, the broken part of the lining layer is excavated. Take it out, repair it using appropriate means from outside the area, and backfill the repaired area.

[Another example]

Next, another embodiment will be described.

The lining material (4) may be a room temperature curing type, a thermosetting type, or any other type. It can be anything.

The shape of the object (5) can be appropriately modified such as a single sphere, a continuous sphere, a bullet, etc., and the material and structure of the object (1) can also be selected as appropriate.

The type of fluid used to move the object (5) may be any gas or liquid.

To measure the pressure inside the main branch pipes (2m), (2b), and (2c) K, various means can be changed, for example, as described below.

(b) Target branch pipe (2m), (2b),
The number and position of (2c) may be appropriately selected depending on the situation.

(b) Pressure measuring device to be used (8m), (8b),
(8c) An appropriate Id, configuration of the measuring section, configuration of the recording section, etc. may be selected.

The moving speed of the object (5) may be determined in advance or may be determined on-site using appropriate means.

The target piping +1+ is generally an existing conduit for city gas, natural gas, water supply, etc., and is particularly preferably a buried conduit, but any other type may be used.

[Brief explanation of drawings]

FIGS. 1(a) to 1(c) are conceptual diagrams showing embodiments of the present invention. FIG. 2 is a graph showing an example of recording measured pressure. Fi+... Main branch, (2m), (2b),
(2c)...Branch pipe, (4)...Lining material, (IS)...Object.

Claims (1)

[Claims] A liquid lining material (4) and a lining object (5) are put into a main branch pipe (1) having branch pipes (2a), (2b), and (2c), and the object (5) is inserted into the main branch pipe by fluid pressure. (1), the lining material (4) is swept away by the object (5), and the lining material (4) is applied to the inner surface of the main branch pipe (1) and the branch pipe (2a). ) or (2b) or (2c), the pressure in the main branch pipe (1) is reduced by the branch pipe (2a) or (2b) or (2c). is measured, and the temporal fluctuation of the measured pressure and the object (5
), the leakage position of the main branch pipe (1) is detected based on the distance from the connection part as a base point.