JPS6184488A - Method of regenerating superannuated pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] <Engineering> Industrial application field The present invention is a method for regenerating old pipes, which is configured to reuse old pipes such as old high-bottom pipelines, land pipelines, and other pipe bodies. It's also about.

<■> Prior Art Pipe bodies such as pipelines exist as a means of transporting oil, gas, water, and other fluids.

However, over a period of several years to several decades, corrosion can occur inside the pipes, leading to leakage accidents.

It is possible to lay new pipes for this purpose, but there are still problems with securing the route and construction costs.
One method is to use existing old pipes to lay new pipes.

For example, a vertical shaft is dug at regular intervals along an old pipe, a pipe having an inner diameter larger than the maximum outer diameter of the old pipe is lowered into the shaft, the core of the pipe is aligned with the old pipe, and a new pipe is dug. This method involves cutting off the old pipes that are covered by the new pipes and removing them from the shaft.

■〉Problems to be Solved by the Present Invention The following problems exist in the method of replacing old pipes as typified by the above example.

(b) The work is complicated and expensive, as obsolete pipes must be removed, and the construction period is long.

(b) When inserting a new pipe, there are two methods: towing it at the tip or pushing it in from the rear, but towing it requires a lot of work, such as passing a wire through the tip of the old pipe.

In addition, the towed Lie 1 Fuu damages the inner surface of the old pipe.

Furthermore, with the pushing method, there is a risk that excessive compressive force may cause buckling or other defects in the moving pipe.

The present invention was made to solve the above-mentioned problems, and by integrating new pipes and old pipes, it is possible to reduce construction costs and shorten the construction period, and moreover, it does not have a negative impact on newly installed pipes. The purpose is to provide a method for regenerating old pipes without causing damage.

<IV> Means for solving the problems In order to achieve the above object, the present invention employs the following means.

(b) Insert an inner pipe as thin as possible into the old pipe.

(b) When inserting an inner pipe into an old pipe, the tip of the inner pipe is closed off, and pressure water, pressure air, etc. is injected from behind to apply pressure to the blocked inner pipe.

(c) Connect multiple inner pipes in the axial direction by welding, etc., and lay a group of inner pipes of the required length inside the old pipe.

(2) Fill the space between the old pipe and the inner pipe group with a solidifying material,
We will construct a recycled pipe with a two-diameter pipe structure that integrates the old pipe and the inner pipe group.

<V> Embodiment (Fig. 1.6) Next, an embodiment of the present invention will be described based on the drawings, but before that, each member used will be explained.

In Figure 1, A is an old pipe, 1 is an inner pipe, 2 is a lid body,
3 is a pressure fitting pipe, and 4 is a reaction frame.

(A) Inner Pipe The inner pipe 1 is a tube body with both ends open and having a diameter that can be inserted into the inside of the aged pipe △.

Then, create the internal cross-section of the regenerated pipe C, which is made up of the inner pipe group B created by connecting the inner pipes 1 and the old pipe A. j! Since the inner pipe 1 is close to the aged pipe A, the outer diameter of the inner pipe 1 is made to match the inner diameter of the aged pipe A, and a thin-walled pipe body is used.

Furthermore, a plurality of protrusions 11 are protruded from the outer periphery of the inner pipe 1 to act as spacers when inserted into the aged pipe A.

(See FIG. 6) The protrusions 11 are arranged spirally around the outer periphery of the inner pipe group B.

A removable lid body 2 is fitted to the tip of the inner pipe 1.

The lid 2 may have a membrane structure or the like, or may be formed by closing the tip of the inner pipe 1 at the front.

It is also possible to form the tip of the inner pipe 1 at the top of A5 so that the inner diameter is small so that it will not be affected by protrusions on the inside of the old pipe (for example, welding sag) when inserting it. .

(b) Pressure injection pipe − Pressure? The pipe 3 is a cylindrical body having a pressure intake port 31 at the base end and a pressure inlet port 32 at the free end.

Then, the pressure injection port 32 side is fitted to the inner pipe 1, and connected to the aged pipe A by the reaction force frame 4.

Pressure water or the like is injected into the inner pipe 1 through this pressure injection pipe 3.

(c) Reaction force frame The reaction force frame 4 is a frame body that connects the aged pipe A and the pressure injection pipe 3 and transmits the reaction force acting on the pressure injection pipe 3 to the aged pipe A.

Therefore, the reaction force frame 4 is unnecessary when taking reaction force from walls and structures other than the aged pipe A.

Next, a method for regenerating old pipes using the above-mentioned members will be explained. (Figs. 2 to 5) (a) Inserting the inner pipe at the tip (Fig. 2) From the end of the aged pipe A, insert the inner pipe 1 whose end is closed with the lid 2 or the like.

Then, the pressure injection port 32 side of the pressure injection pipe 3 is fitted to the other end of the inner pipe 1.

Next, after connecting the aged pipe A and the pressure injection pipe 3 with the reaction force frame 4, pressure injection is started.

(Port) Start of injection (Fig. 2) After connecting the old pipe A and the pressure injection pipe 3 with the reaction force frame 4,
Start pressure injection.

Since the reaction force of the injection pressure is applied to the aging pipe Δ by the reaction force frame 4, the pressure injection pipe 3 does not move during pressure injection.

(C) Laying the inner pipe group (Figure 3) A new inner pipe 1 is connected by welding or the like to the rear end of the inner pipe 1 inserted into the old pipe A by pressure injection to form the inner pipe group B. To go.

In other words, if you insert the first inner pipe 1 into the old pipe A,
The reaction frame 4 and the pressure injection pipe 3 are removed, and the next inner pipe 1 is connected to the preceding inner pipe 1 by welding or the like.

The inner pipes 1 are connected in such a way that the protrusions 11 arranged spirally on the outer circumferential surface of the inner pipes 1 are also connected spirally on the outer circumferential surface of the inner pipe group B.

(See Figure 1.6) After the connection is completed, as shown in Figure 4, the reaction frame 4 and pressure injection pipe 3 are set again and the inner pipe group B is press-fitted.

(Fig. 5) (d) Injection of solidifying material (Fig. 6) Inner pipe 1 consisting of ze-decomposition pipe A and plural inner pipes 1! T
A solidifying material 5 is injected between the inside and the outside to integrate the inside and outside.

And the inner pipe! By removing the lid 2 at the tip of the IB, etc.
The installation of regenerated pipe C consisting of aged pipe A and inner pipe group B is completed.

(E) Other Embodiments 1 The inner pipe group B can be formed by a method other than the above embodiments.

That is, the inner pipe 1 with its tip closed and the pressure injection pipe 3 built inside is inserted into the old pipe A, and a new inner pipe 1 is welded to the progeny of the inner pipe 1, and then pressure injection is performed. .

The pressure injection pipe 3 inside the inner pipe 1 is retracted as the inner pipe 1 is filled with pressure water etc. from the pressure injection hole 32.

Retreat until it comes into contact with the reaction force frame 4 and further pressurize xtmv
``5・jll (wheat)'' (DM, +<471815
.

Send it into pipe A.

Next, the pressure injection pipe 3 is reinserted into the inner pipe 1 and a new inner pipe 1 is connected.

It is also conceivable that when the rear inner pipe 1 is fed into the aged pipe A, the pressure injection pipe 3 is moved forward at the same time.

Example 2 of the pond Also, as shown in Fig. 7, the pressure injection pipe 3 is not pushed out,
It is also conceivable to use the feeding device 6.

At the same time, a vR device is installed on the pressure intake port 31 side of the pressure injection pipe 3.

The feeding device 6 is configured to push out the pressure injection pipe 3 using, for example, a rack or a pinion mechanism R.

After connecting the new inner pipe 1 to the rear end of the already inserted inner pipe 81:B, while injecting pressure, the inlet pipe 3 is moved forward by the feeding device 6. 7th
(Figure) After advancing a certain distance, the pressure injection pipe 3- is retreated to its original position, a new inner pipe 1 is roughly connected, and this process is repeated.

<Vl> Effects of the Invention Since the present invention has been described above, the following effects can be expected.

(b) In constructing the regenerated pipe, an inner pipe was connected and inserted into the old pipe, and a solidifying material was injected between the inner pipe group consisting of multiple inner pipes and the old pipe.

Therefore, it is possible to shorten the construction period and reduce construction costs without requiring the trouble of removing old pipes.

(b) When inserting the inner pipe into an old pipe, close the end of the inner pipe with a removable H body, etc., and apply pressure to the lid body by injecting pressurized water, compressed air, etc. from the rear. I did it.

It has the same effect as traction from the front.

Since this method does not involve pushing the inner pipes from behind, no compressive force is applied to the pipes, and there is no adverse effect on the inner pipes.

(c) The regenerated pipe will be either a double pipe consisting of an old pipe and a group of inner pipes, or a one-piece (suspended pipe) body.

Therefore, the old pipes preserve the inner pipe group against external pressure, etc., and the inner pipe group is made up of new inner pipes on the inner surface, so it is highly corrosion resistant and can be regenerated as a strong pipe body.

(D) Since a protrusion is attached to the outer circumference of the inner pipe, there is no accidental contact between the inner pipe and the old pipe during 1irr operation, and not only is there less friction, but there is also no welding sag on the old pipe. It can be inserted smoothly without getting caught.

[Brief explanation of the drawing]

Figure 1: An explanatory diagram of each member used in the method for regenerating old pipes of the present invention. Figures 2-5. Explanatory diagram of regeneration pipe Figure 7 - Other explanatory diagram of Example 2 1: Inner pipe 2: Lid body 3; Pressure injection pipe 4: Reaction force frame 5: Solidifying material

Claims (1)

[Claims] A method for repairing old pipes, which is characterized by inserting an inner pipe with a blocked tip into the old pipe, pressurizing the inner pipe to move it forward inside the old pipe, and injecting a solidifying material between the group of inner pipes and the old pipe. How to play.