JPH029953Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a jig for coating the inner surface of a pipe.

[Conventional technology]

Conventionally, when coating (lining) the inner surface of a pipe with a corrosion-resistant thermoplastic material for the main purpose of preventing corrosion, jigs such as those illustrated in Figs. 6, 7, and 8 are used at both ends of the pipe. It is well known that it is used. That is, the jig shown in Fig. 6 is of a type in which the tip of the lining tube 2 inserted into the main pipe 1 is sandwiched between the main pipe 1 and the lid member 3 having a conical protrusion. With this method, it is not easy to properly engage the conical protrusion of the lid member 3 with the tip of the tube 2. Even if the tube 2 is properly fixed, there is no place for air to escape between the main tube 1 and the tube 2, so high-temperature fluid (e.g. steam, heated air, etc.) ) to heat, soften, and expand the tube 2 to make it adhere tightly to the inner surface of the main pipe 1, the swelling remains and it is difficult to obtain the desired effect, so a jig of the type shown in Figure 6 is preferable. I can't say that. The jig of the type shown in Fig. 7 has better workability than the jig of the type shown in Fig. 6 because it fixes the end of the tube 2 by folding it around the outer periphery of the end of the main pipe 1. ,
It is the same in that the air between the main pipe 1 and the tube 2 cannot be degassed, and the airtightness of the lid member 3 is not sufficient, so high temperature fluid is likely to leak, making it impossible to obtain a favorable construction result. In order to eliminate the drawbacks of such a system, a system as shown in FIG. If the end of the tube 2 is folded back and fixed, the air between the main tube 1 and the tube 2 will be removed from the gap between the end of the main tube 1 and the support tube 5.
No more swelling due to residual air after lining. However, there are two or more types of tube 2, such as a main tube that remains as the main coating layer on the inner surface of the main pipe 1 and a reinforcing tube that is removed after coming into contact with high-temperature fluid during construction and reinforcing the high temperature strength of the main tube. When the objects are overlapped, the jig shown in Figure 8 has only one folded part of the tube 2, and it is not possible to degas the different types of tubes that make up the tube 2, resulting in the expected effect. cannot be obtained.

[Problem that the invention attempts to solve]

This idea is easy to work with, and the air between the inner surface of the pipe and the coating material, as well as between the coating materials when there are multiple layers, can be easily removed, making it possible to coat the inner surface of the pipe with good adhesion. The technical challenge is to develop a jig that will

[Means to solve the problem]

In order to solve the above problems, this invention provides a first support pipe that is fitted onto the main pipe and connected to the main pipe, and a second support pipe that is connected to the first support pipe by creating a space around the tip end of the first support pipe. The inside of the main pipe was penetrated with a jig consisting of a lid member having a fluid inlet and closing the tip of the second support pipe, and a tightening ring that tightened and fixed the lid member to the second support pipe. The end of the outer layer of the multilayer tube for inner surface coating is folded back and fixed to the outer peripheral surface of the distal end of the first support tube, and the end of the inner layer of the multilayer tube is fixed to the lid material and the second support tube. It was made so that it could be inserted and fixed between the parts where the two come into contact.

〔Example〕

An embodiment of this invention will be explained using the drawings.

First, the main pipe 1 in this invention is, for example, a water pipe, a gas pipe, a sewage pipe, or other various types of piping.
It may be either an existing pipe or a new pipe, and there are no particular limitations on the material, diameter, etc. just,
The material must be able to withstand temperatures higher than the softening point of the inner coating material, and in order to obtain an inner coating with a uniform layer thickness, the closer to a straight pipe the better, and in addition, the material near the end should be As illustrated, it goes without saying that it is more advantageous to have no large protrusions or obstacles such as flanges.

Next, the first support pipe A of this invention serves to fix each component of the jig of this invention to the main pipe 1, and is composed of a main pipe fixing part 10 and a tip part 11. The main pipe fixing section 10 shown in FIG. 1 is of a type in which the main pipe 1 is fixed by uniformly tightening the outside of the main pipe 1 from the periphery using a plurality of bolts 12. With this type of system, even if there are thread grooves or small protrusions for connection at the end of main pipe 1, there will be no problem with installation as long as the inner diameter is larger than the outer diameter of these. However, many bolts 12
Since it is not necessarily preferable in terms of workability to tighten the main pipe while keeping it as balanced as possible, it is preferable to use the normal installation method of belt tightening (not shown), or to tighten the When a thread groove is provided in a portion, the same thread groove as this thread groove may be provided on the inner surface, and the main pipe fixing portion 10 may be of a screw type. In addition, in the case of such a screw-in type, it is preferable to appropriately provide a small air vent hole 13 in a portion close to the boundary with the tip portion 11. In addition, a step with a height equal to or greater than the wall thickness of the main pipe 1 is provided at the boundary between the main pipe fixing part 10 and the tip part 11, and the inner diameter of the tip part 11 is adjusted to the inner diameter of the main pipe 1. This not only simplifies the adjustment effort of fixing the first support pipe A to the main pipe 1 at a constant depth, but also is effective in improving work efficiency.
Since there is no extreme level difference between the inner surface of the distal end portion 11 and the inner surface of the main pipe 1, this is preferable since it is advantageous for improving the adhesion of the coating material to the distal end portion of the main pipe 1.

Here, the material for the inner surface coating of the main pipe 1 in this invention is made of a thermoplastic natural or synthetic polymer compound alone or a mixture or composite thereof, and is made of a thermoplastic natural or synthetic polymer compound alone or a mixture or composite thereof, and is made of a thermoplastic natural or synthetic polymer compound. As a result, it easily softens and swells in response to the pressure of the fluid, and furthermore, the crosslinking reaction is promoted by the action of additives and changes into a polymer with a higher molecular weight.
It can be said that it is more preferable if the chemical, mechanical, thermal or other properties can be improved. Naturally, it is necessary that the coating has affinity (adhesion) with the material of the inner surface of the main pipe 1 and is resistant to the fluid passing through the main pipe 1. In normal cases, materials suitable for each role are formed into a tube shape that is longer than the main pipe 1 and has an appropriate thickness. In this case, the tubes are made by laminating two or more materials by simultaneous molding, or they are made by simply passing one tube through another and stacking them, which was difficult to handle with conventional jigs. (hereinafter referred to as multilayer tube 6).

The coating material processed into a tube shape is penetrated into the main pipe 1 in advance, and the coating material tube ( When the multilayer tube 6 is used, the tip of the outer layer (ie, the layer that is brought into close contact with the inner surface of the main tube 1) is folded back while applying appropriate tension and fixed as shown in FIG.

Next, the second support pipe B is connected to the tip of the first support pipe A. When attaching and detaching this, the second support tube B has a large inner diameter so that the end of the tube, which is folded back and fixed to the tip a of the first support tube A, will not be shifted or damaged. A large diameter portion 14 that can be connected to the first support tube A while leaving an appropriate space around the outer periphery of the tip portion 11 of the tube A.
and a small diameter portion 15 whose inner diameter is approximate to that of the main tube 1 (and therefore also approximate to the inner diameter of the distal end portion 11 of the first support tube A). and,
Although the specific method for connecting the large diameter portion 14 to the first support tube A is not particularly limited, for example, as shown in FIG. and the second support pipe B is attached to this.
It is preferable to screw the large-diameter portion 14 of the holder in place of the holder, since this is more convenient than fixing by bolting or the like. In addition, at the leading end b of the small diameter portion 15, there is a tube (inner layer of the multilayer tube 6 in the above example) like the leading end b of the first support tube A.
Fold back and secure. Note that it is preferable to provide small holes 13 in the large diameter portion 14 as appropriate to facilitate degassing.

Moreover, the lid material C of this invention is the second support tube B
It is used to close the small diameter part 15 of the main pipe 1, but it also has a fluid inlet 17 for introducing high-temperature fluid (and discharging it at the other end of the main pipe 1), and if necessary, a pressure gauge, a thermometer, etc. A meter mounting port 18 is provided for attaching or inserting a meter.
The specific shape of the part where this lid material C comes into contact with the second support tube B is not particularly limited, and the tube folded back to the tip end b of the second support tube B is used as an airtight packing material. Although not shown in the drawings, this idea can be applied to surfaces that are smooth, have concentric grooves, or have a truncated cone shape as shown in Figure 3. It does not cause any hindrance in any way.

Furthermore, in order to bring the lid member C into close contact with the tip 11 of the second support tube B, a tightening ring D is used, which is similar to a normal cap nut.
A hole of a size that does not seal the fluid inlet port 17, instrument mounting port 18, etc. of the lid member C is bored on the top surface, and the inner diameter of the threaded portion is larger than the outer diameter of the tip end b of the second support tube B. Larger and smaller diameter portion 1 of second support tube B
5, it may be of any shape as long as it does not damage the tube folded back at the tip part b when it is attached or detached, and the outer surface is a prismatic shape that can be rotated with a square or hexagonal spanner, monkey key, etc. It may also be cylindrical with a handle 19 as shown in FIG. 4, but the latter is advantageous in terms of workability.

The first support tube A, the second support tube B, the lid C and the tightening ring D described above are assembled in sequence as shown in FIG. Part b and first support tube A
When the high temperature fluid is fed into the main tube 1 from the fluid inlet port 17, the temperature inside the main tube 1 gradually rises from the front to the back, and the multilayer tube 6 softens and reaches a high temperature. Main pipe 1 swells due to fluid pressure
adheres to the inner surface of the At this time, the air between the outer layer of the multilayer tube 6 and the main pipe 1 is forced out through the gap or small hole 13 between both ends of the main pipe 1 and the first support pipe A, and the air between the outer layer of the multilayer tube 6 and the Since the air is forced out through the gaps such as the small holes 13 in the second support tube B, it is possible to prevent swelling due to residual air and, in turn, defects that may cause peeling of the coating.

〔effect〕

The jig of this invention is extremely easy to attach and detach from existing pipes and to fix the coating material.It has excellent workability not seen in conventional jigs, and is effective in preventing leakage of high-temperature fluid used during construction. It is also extremely effective for adjusting the internal pressure and removing reinforcing tubes that are no longer needed after construction, so the significance of this invention can be said to be extremely large.

[Brief explanation of drawings]

Figures 1 to 5 are cross-sectional views illustrating the structure of the pipe inner surface coating construction jig of this invention, in which Figure 1 is the first support pipe, Figure 2 is the second support pipe, and Figure 3 is the The lid material, FIG. 4 shows the tightening ring, and FIG. 5 shows the state when these are assembled. Moreover, FIGS. 6-8 are schematic cross-sectional views for illustrating a conventional jig. A...First support pipe, B...Second support pipe, C...
Lid material, D... Tightening ring, a, b... Cutting edge part, 1... Main tube, 2... Tube, 3... Lid material,
4...Fluid inlet, 5...Support tube, 6...Multilayer tube, 10...Main pipe fixing part, 11...Tip, 12...Bolt, 13...Small hole, 14...Large diameter Part, 15... Small diameter part, 16... Threaded part, 17...
...Fluid inlet, 18...Instrument installation port, 19...
...A hand to hold.

Claims (1)

[Scope of utility model registration request] A first support pipe that is externally fitted and connected to the main pipe, a second support pipe that is connected to the first support pipe by creating a space around the distal end thereof, and a distal end of the second support pipe that has a fluid inlet. The end of the outer layer of the multi-layer tube for internal coating that penetrates the main pipe is connected to the first support pipe. The multilayer tube is fixed by being folded back to the outer peripheral surface of the tip thereof, and the end of the inner layer of the multilayer tube is inserted and fixed between the contact portion of the lid material and the second support tube. Jig for coating the inner surface of pipes.