JPS62183330A - Inside lining method for pipe body - Google Patents

Abstract

PURPOSE:To enable formation of a lining layer which has adhered strongly on the inside of a pipe body by performing insertion of a lining material smoothly and eliminating a nonapplication part of an adhesive agent, by a method wherein a gap between the lining material inserted into the pipe body and the pipe body is filled with a solvent type adhesive agent, the excessive adhesive agent is discharged and both the pipe body and the lining material are stuck together after a solvent of the adhesive agent has been volatilized and dried. CONSTITUTION:A tubular lining material 2 composed of vinyl chloride resin, which has the slightly smaller outside diameter than the inside diameter of a pipe body 1 is inserted into the pipe body 1 and the inside of a gap between the pipe body 1 and lining material 2 is filled with a solvent type adhesive agent by casting the same from the top of the gap through an adhesive agent casting nozzle 3. Then the excessive adhesive agent is discharged naturally by opening a valve 55 of a discharge short pipe 54 and solvent contents are volatilized and dried forcibly. Then along with softening of the lining material 2 the same is stuck to the inside of the pipe body 1 by expanding the same in the direction of the diameter by a closing up both pipe end parts of the same tightly with blind flanges and pouring hot water within the same with high pressure through one side of the pipe end parts.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a method for lining an arm-shaped lining material such as a synthetic resin pipe or the like on the inner surface of a body, and in particular a method for adhering to the inner surface of a pipe body and the outer surface of a lining material. It is characterized by the method of applying the agent.

(Prior Art) When lining a pipe body such as a metal pipe with a tubular lining material such as a synthetic resin pipe, the following method has been conventionally used as a method for applying an adhesive.

That is, a solvent-based synthetic rubber adhesive or the like is applied to the inner surface of the metal tube and the outer surface of the synthetic resin tube separately using a spatula or spray before insertion, or
As described in Japanese Patent No. 41246, it is applied by pouring it onto the inner surface of a rotating tube. After the solvent is evaporated and dried, the lining material is inserted into the pipe body, and the lining material is expanded in diameter by filling the inside of the lining material with heated pressurized fluid, and adhesive is applied to the inner surface of the pipe body. The lining is done through.

(Problem to be solved by the invention) However, in the above-mentioned conventional method, the lining material is made of gold.
The adhesive layer tends to peel off when the lining material is inserted into the screen, and the peeled adhesive makes it difficult to insert the lining material into the metal pipe. In particular, when the metal pipe to be lined is of a special type such as a curved pipe or a double-shaped pipe, the following problems arise.

4. In other words, it is not possible to form a uniform adhesive layer on the inner surface of a straight metal tube with the above-mentioned special shape by brush coating, spray coating, flow coating, etc. It is impossible to avoid uneven coating. In addition, when inserting the heating and softening material, the fully dried adhesive layer on the inner surface of the metal tube melts under the heat and pressure of the 7th step, and as a result, the contact friction with the inserted 2nd inning material makes it easy to use. This causes the film to peel off.

Therefore, the adhesive strength of the lining layer cannot be guaranteed over the entire surface.

In order to avoid the above-mentioned peeling and to make the insertion easier, the outer diameter of the lining material should be made sufficiently small. As a result, the lining layer formed not only becomes extremely thin, but also has an adverse effect on its adhesive strength due to the shrinkage effect that occurs during cooling.

As mentioned above, in any case, when the metal pipe has a special shape such as a curved pipe or a double-shaped pipe, the conventional method is to form a strongly bonded double layer on the inner surface of the metal pipe. It is not possible.

(Means for Solving the Problems) This invention addresses the above-mentioned problems that cannot be avoided with conventional methods. (Function) In this invention, when inserting the lining material into the tube body, no adhesive is applied to either the inner surface of the tube body or the outer surface of the lining material. This can be done smoothly without any resistance from the layers.

In addition, since the solvent-based adhesive is once filled into the gap between the pipe body and the lining material, the adhesive can be applied to even the smallest details.
There is no part Fi that is not coated.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway front view of the main parts for explaining the present invention, in which the lVi tube body, the 2-piece lining material, and 3 indicate an adhesive injection nozzle. First, the inner surface of the metal tube 1 to be lined is subjected to pretreatment such as pickling and blast treatment.

Tube IFi: Anything made of metal that will not be deformed by heating.The tube 1 has been subjected to h0 pretreatment and has an outer diameter slightly smaller than the inner diameter of the tube 1. A tubular lining material 2 made of vinyl chloride resin is inserted. The lining material 2 is made of thermoplastic synthetic resin such as polyethylene resin, polypropylene resin, polyamide resin, etc. in addition to vinyl chloride resin, and must be easily softened and deformed when heated.

If the pipe body 1 has a straight pipe shape, no complicated operation is required to insert the lining material 2, but if the pipe body l has a special shape such as a curved pipe or a double-shaped pipe, It is necessary to fill the inside of the lining material 2 with a filler such as sand, heat it to soften it, and insert it into the pipe body 1 while being pulled. At this time, since no adhesive or the like is applied to the inner surface of the tubular body 1 or the outer surface of the lining material 2, it can be easily pushed in without receiving excessive resistance.

After the pressed lining material 2 is cooled and solidified, the filling inside it is removed.

The tube 1 into which the lining material 2 has been inserted in this way is attached to the pedestal 4 in the vertical direction as shown in FIG. Positioning tools 41 and 42 are used to position the lining material 2 so that
Fix it by. To be more specific, first, while holding the lining material 2 by hand so that it does not fall, the one-piece flange 11 of the tube body 1 is attached to the upper part of the papermaking stand 4 using bolts 111. In addition, since the positioning tool 41 is provided in series with this port 111#, the lining material 2 can be fixed and positioned at the same time.

Next, by connecting the positioning tool 42 with the port 121 to the seven flange 12 at the lower end of the tube l, the lining material 2
9. Position the lower pant.゛Here, the positioning tool 4
2, a backing stand 51 having a backing 52 having a substantially conical cross section affixed to its outer surface is attached via a tightening tool 53. Therefore, the said tightening
By aligning, the /l packing base 51H is pushed up along the outer surface of the lining material 2, and the lower end gap between the tube body 1 and the lining material 2 is sealed by the backing 52.

In this way, a solvent-based adhesive is injected into the adhesive injection nozzle 3 from the upper end of the gap between the pipe body 1 and the lining material 2, which are vertically supported by the frame 4, and the gap is filled with the adhesive. Let it fill. Keep the adhesive filled for about 10 minutes for degassing.

At this time, it is preferable to bring a pipe rake into contact with the outer surface of the tube body 1 to vibrate it, since degassing proceeds more quickly and reliably.

Next, the pulp 55 of the discharge short pipe 54 inserted through the /Q packing table 51 and the first packing 52 is opened,
Allow excess adhesive to drain naturally. The discharged adhesive B is used for another lining without being discarded. After this,
Either wait for the solvent contained in the adhesive adhered to the inner surface of the tube body 1 and the outer surface of the inning material 2 to naturally evaporate and dry, or blow hot air into the gap, as described above. After sealing the upper end of the gap, the ar/Iff gap is evacuated from the short discharge pipe using a vacuum pump to forcibly volatilize and dry the solvent.

Forced drying speeds up the drying process and the resulting adhesive! IIC is also suitable because it is uniformly stable.

The hydraulic lining material 2 is bonded to the inner surface of the pipe body l using the adhesive described above.The method for this is to attach both pipe ends of the lining material 2 tightly by twisting, etc., and then hot water is applied to one end of the pipe. Alternatively, the lining material 2 may be softened and expanded in the radial direction by injecting steam or the like under high pressure to adhere it to the inner surface of the tube 1. Alternatively, the adhesive may be heat-foamable. In this case, a suitable method is to place the entire tube 1 including the lining material 2 in a heating furnace and foam the adhesive to adhere the lining material 2 to the inner surface of the tube 1. used for.

Effects of the Invention) As described above, according to the present invention, when inserting a lining material into a pipe body, particularly a pipe body having a special shape such as a curved pipe or a double-shaped pipe, adhesive is applied in advance. Disability due to being, v! Also, the contact resistance is large and insertion is difficult, which not only causes the adhesive to peel off, but also causes the lining material itself to be unnecessarily stretched due to the resistance, resulting in uneven wall thickness. It can be easily inserted by folding it without any problems such as sticking. Also, there are no areas where adhesive is not applied, and a strongly bonded lining layer is formed on the inner surface of the tube. be able to.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing one step of the invention. 1... Pipe body 2... Lining material 3... Adhesive injection nozzle 4... Frame 41. 42... Positioning tool 52... Drilling

Claims (1)

[Claims] 1. A method of lining the inner surface of a tube with a tubular lining material made of synthetic resin, comprising: filling a gap between the lining material inserted into the tube and the tube; One end of the tube is sealed, the gap is filled with a solvent-based adhesive, and then the excess adhesive is discharged to the outside, and the solvent of the adhesive adhering to the inner surface of the tube and the outer surface of the lining material is evaporated and dried. A method for lining the inner surface of a pipe body, the method comprising: gluing the two together. 2. After the solvent-based adhesive evaporates and dries, the lining material is softened by heating, expanded under pressure, and adhered to the inner surface of the tube via the adhesive, the inner surface of the tube according to claim 1. Method. 3. A patent in which the solvent-based adhesive is heat-foamable, and the lining material is bonded to the inner surface of the tube by heating the entire tube including the lining material and foaming the adhesive. A method for lining the inner surface of a tube according to claim 1.