JPS59170586A - Method of removing lining of inner-surface lining 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 The present invention relates to a method for removing the lining of an inner-lined pipe, and more particularly to a method for removing the lining of an inner-lined pipe in which a rubber-like elastic tube is tightly attached to the inner surface of the pipe.

Pipelines and other pipes are often lined to protect their inner surfaces.

For example, if large particles such as stones and gravel are mixed into the fluid flowing in a slurry pipeline, severe wear will occur, and holes will form in a steel pipe without lining in a short period of time. The inner surface must be lined with a material with excellent wear resistance (eg, urethane rubber, natural rubber, styrene-butadiene rubber).

As such a lining method, the applicant has proposed a method in which the inner surface of the tube is lined with a rubber-like elastic tube. (JP-A-57-100290>) The method of JP-A-57-100290 involves, if necessary, inserting a thin-walled tube made of a rubber-like elastic material into the inner surface of a pipe such as a steel pipe, and bringing the outer surface of the tube into the inner surface of the tube. The lining is formed by bringing them into close contact.

However, even if the inner surface of the pipe is lined with a rubber-like elastic tube, this lining is not permanent, and the tube wears out over time and the bare surface of the steel pipe eventually becomes exposed.

Conventionally, the measures to be taken when the lining of a high line becomes worn out in this way are: (a) Disassemble the pipeline and take it back to the factory to have the lining replaced, and then transport it to the site again and rebuild the pipeline; (b) Steel pipes Countermeasures have been taken such as using pipes until they become perforated, disassembling them into scraps, and transporting new steel pipes lined with new ones to construct pipelines, but all of these methods require significant costs and long downtime. A period is necessary.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for removing the lining of an inner-lined pipe, which can extremely quickly remove the tube lined on the inner surface of the pipe, thereby significantly shortening the lining repair time. The purpose is to

The method for removing the lining of an inner lining pipe of the present invention is to insert a wire into the inner lining pipe in which a tube made of a rubber-like elastic body is tightly attached to the inner surface of the pipe, and then remove the lining from one end of the inner lining pipe. The tube was squeezed and attached to the inserted wire, and then the wire was pulled toward the other end of the inner lining tube, and the tube was peeled off from the inner surface of the tube while being folded back to the inner surface of the tube to be removed from the limb canal. It is something.

The present invention will be explained in more detail below with reference to embodiments shown in the drawings.

FIG. 1 is a cross-sectional view of the lining tube ] 0, in which core fibers 14 (
For example, fibers such as nylon, vinylon, Tetron, etc.) are included. If the fluid is still a slurry, wear is particularly severe on the lower surface, so as a countermeasure, a soft natural rubber sheathing material 16 is glued to the tube body 12 on the lower inner surface, or it is straddled and the sheet is rolled up. When making a tube shape, as shown in Figure 1 0)), they are overlapped and joined to make the lower part heavier.

FIG. 2 is a side view of a pipeline 18 whose inner surface is lined with this tube 10. 20 in the figure,
22 is a flanged short pipe connected to the end of the pipeline 18, and the pipeline 1 is connected by a flange joint.
It is detachably connected to 8. (In the figure, 24 indicates a flange.) In the pipeline 18 lined with the tube 10 as described above, the tube 10 is worn out due to use and a method for removing the tube will be described below when relining it with a new tube. do. In addition, in the tube 10, for example, when the core fiber 14 is exposed, the usage limit is reached and the tube is replaced. As a method of detecting this exposure, a removable flanged short pipe may be inserted at an appropriate location in the pipeline 18 to inspect the inside, or a trolley equipped with a television camera may be installed in the pipeline 18. It may also be possible to send it for inspection.

The removal work will be performed in the following steps and manner.

(1) First, insert the wire 26 into the pipeline 18. As a method for inserting the wire 26, for example, the method shown in FIG. 3 is used. That is, the pig 28 to which the wire 26 is connected is inserted from one end of the pipeline 18, and the pig catcher 3 is inserted into the other end of the pipeline 18.
0. Connect the vacuum pump 32. When the vacuum pump 32 is activated to reduce the pressure inside the pipeline 18, the pig 28 is sucked into the pipeline 18 and moves, reaching the other end.
Thereby, the wire 26 connected to the pig 28 also passes through the pipeline 18. Then the wire 28 from the pig 28
and the pig catcher 30 from the pipeline 18. FIG. 4 is a sectional view showing this state.

■ As shown in Figures 2 to 4, pipeline 1
Short tubes 20 and 22 with flanges are connected to both ends of the tube 8, and at the portions of the short tubes 20 and 22, the tube 10 is attached to the short tubes 20 and 22 using a dry solidifying adhesive or a two-component vulcanizing adhesive. It is glued to the inner surface of .22. So tube 1
0 from the inner surface of the short tube 20.22. This peeling operation is carried out, for example, by heating the short tubes 20 and 22 from their outer surfaces to weaken the adhesive force of the adhesive, and then driving a temporary hole into the bonded portion and peeling off the tube 10.

After stripping the tube 10 from the inner surface of the short pipe 20.22, the short pipe 20.22 is separated from the pipeline 18 at the flange joint.

(2) Next, high-temperature fluid such as hot air or hot water is supplied into the pipeline 18.

In a portion of the pipeline 18 other than the short pipes 20 and 22, the lining tube 10 is tightly adhered to the inner surface of the pipeline 18 via an adhesive. Therefore, it is preferable to heat the adhesive with a high-temperature fluid to reduce its viscosity before performing the peeling operation, thereby facilitating the subsequent peeling operation.

(2) Next, as shown in FIG. 5, the tip of the tube 10 is squeezed at one end of the pipeline 18, and the one end of the tube 10 is engaged with the wire 26 inserted above. In this case, it is preferable to use a thin wire 34 or the like to tighten the wires as shown in FIG.

(2) Next, pull the wire 26 to the other end of the pipeline 18. As shown in FIG. 6, the tube 10 is sequentially folded back toward the inner surface and begins to be peeled off from the inner surface of the pipeline 18. By continuing to pull the wire 26 further, the tube 10 can be removed from the pipeline 18.

■ After removing the lining in this way, it can be relined. Various methods can be used for this lining method. However, the lining method previously proposed by the applicant (mentioned above, JP-A-57-1.O
According to O290), relining can be carried out extremely quickly.

After inserting the new tube into the pipeline 18, flanged short tubes are flanged to both ends of the pipeline 18, and the short tubes and the lining tube are fixed with adhesive.

In a pipe lined with a tube 10 in this way, this tube 10 can be quickly removed and the downtime required for relining is also significantly reduced.

In the above embodiment, the pipeline 18 and the tube ]0
Since the adhesive interposed between the two parts is heated to soften it and then peeled off, the above operation can be carried out more smoothly and quickly.

At the same time, the adhesive between the inner surface of the short tube and the tube 10 is heated before being peeled off, and this peeling off is also extremely easy.

As described above, according to the present invention, the lining of the inner lining pipe can be quickly removed. Further, this work does not require the use of any special jigs, making the work easy and inexpensive.

[Brief explanation of drawings]

1(a) and 1(b) are cross-sectional views of the tube 10, FIGS. 2 and 3 are side views of the VIG line, FIG. 4 is a side view showing a method of passing the wire 26 through the pipeline, and FIG. FIG. 5 is a sectional view showing a state in which the tube 10 and the wire 26 are tied together, and FIG. 6 is a sectional view illustrating a peeling operation. 10...Tube, 18...Pipeline, 2
6...wire, 28...big, 32...
Vacuum pump.

Claims (2)

[Claims] (1) In an inner lining tube in which a tube made of a rubber-like elastic material is closely attached to the inner surface of the tube, a wire is inserted into the inner lining tube, and then the tube is squeezed at one end of the inner lining tube to remove the inserted wire. A method for removing the lining of an internally lined tube, the method comprising: attaching the wire to the internally lined tube, then pulling the wire toward the other end of the internally lined tube, folding the tube back to the internal side of the tube, and peeling it off from the internal surface of the tube to remove it from the limb tube. . (2) The tube is closely attached to the inner surface of the tube via an adhesive, and before attaching the tube to the wire, high-temperature fluid is supplied into the tube to heat the adhesive and reduce its viscosity. A method according to claim 1, characterized in that the method comprises: