JPS6283125A - Lining for inner surface of pipeline - Google Patents

Abstract

PURPOSE:To obtain high-quality tube lining by a method in which tube lining is gradually made from the starting point to the ending point of the tube by moving a pig in the tube, and the tube is softened by heating and then expanded under a pressure. CONSTITUTION:In making a tube 1 lining work, under a condition that a pig 4 is braked by compressed air from the supply port d2' of the tube d2 on the end side, steam is supplied from the supply port d1' of the tube d1 on the start side into the tube 1. The pig 4 is then gradually moved from the start point to the end point in the tube 1 by a pressure difference to be produced on both sides of the pig 4. During the moving period, the tube 1 is softened and expanded and then closely contacted with the inner surface of a pipeline (a). An excess adhesive and air are forced to discharge in the advancing direction from between the pipeline (a) and the tube 1 and finally from an outlet (e) to the outside of the system. Tube lining without air trap can thus be applied to the inner surface of the pipeline (a).

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to an internal line construction method for conduits.

Conventional internal lining of pipes: As the J-Que method, a method has been proposed in which a lining tube is inserted into the pipe, the inserted tube is expanded within the pipe, and then adhered to the inner surface of the pipe.

Problems to be Solved by the Invention However, in the method of lining the inner surface of a conduit by inserting and expanding a tube, there is a problem in that air pockets are likely to occur between the inner surface of the conduit and the lining tube, and thus poor adhesion is likely to occur.

The present invention has been made for the purpose of eliminating the problems of the prior art.

Means for Solving the Problems The present invention involves inserting into a conduit a thermoplastic lining tube with a diameter smaller than that of the conduit and coated with an adhesive on the outer circumferential surface, and inserting a thermoplastic lining tube into the lining tube. is installed, and while controlling the moving speed of the heated pressurized fluid supplied inside the tube by the pita, as the heated pressurized fluid moves inside the tube, the tube is softened and expanded and brought into close contact with the inner surface of the conduit. The present invention relates to a construction method for lining the inner surface of a conduit, which is characterized by lining the inner surface of a conduit.

An embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 1 schematically shows the process of inserting the inning tube (1) into the conduit (a). As the tube (1), in order to smoothly line the inner surface of the conduit (a),
As usual, one with a slightly smaller diameter than the pipe line (-) is used. Such a lining tube (1) must be thermoplastic, especially thermoplastic materials with good adhesion properties such as polyester resin, polyurethane, polyurethane, and polyester resin. It is preferable to use When inserting the tube (1) into the tube (Ca), an adhesive (not shown) is applied to the outer surface of the tube (1) in advance or during insertion.

As the adhesive, various reaction-curing type adhesives and other adhesives of the car-melt type can be used.

When inserting the tube (1) into the conduit (a), the tube (1) and the traction tube (b) are
) are directly connected, a considerable load will be placed on the joint between the two when inserting and retracting the tube (1), which may cause problems such as the tube being unable to withstand this load and the joint breaking. Ta. In this case, for example, as shown in the figure, a flexible belt (2) inserted in advance over the entire length of the tube (1) is connected to a traction rope (b), and this belt (
If the tube (1) is pulled in through the tube (1), the load on the joint (3) of the tube (1) will be significantly reduced, and the risk of the joint (3) being cut will be eliminated. obtain.

FIG. 2 shows how the lengths of the conduit (a) and the tube (1) are adjusted, which is performed subsequent to the step of inserting the tube (1). This length adjustment is done using the tube (1
), but this may be omitted in some cases. After adjusting the length of the tube (1), it is cut leaving extensions (b) αI) (see Figure 3) at both ends.
The belt (2) is then removed from the tube (1).

FIG. 3 shows the situation during the installation of the shim (4), which is performed subsequently to the length adjustment. When installing this screw (4), first connect the tube (1) inserted into the conduit (-) to the starting and terminal ends of the conduit (a) at the extension parts α (b) at both ends. The mouth end of the terminal pipe (a□) (a2) For example, the tightening is fixed by applying a link (C), and then in the terminal pipe (a□) on the starting end side, the pipe (d) and approximately An elastic elbow (4) of the same diameter or a slightly larger diameter is installed, and then the terminal tube (4) is installed.
a□) Beef Yap Cd at the mouth corner of (a2), respectively.
)(d2) is applied. Cow Yadzu (d-work) Cd2>
A water vapor supply port (dil) is formed at the starting end, and a pressurized air supply port (d2-) is formed at the terminal end.
In addition, between the terminal pipe (d2) on the terminal end side and the terminal end of the pipe line (a), there is an extraction port (1) for extracting excess adhesive and air.
) is formed.

Figure 4 shows the situation when the tube is lined subsequent to the installation (4). When lining this tube (1), the supply port (d2.
) with pressurized air supplied into the tube (1) from the start end tube (
Water vapor is supplied into the tube (1) from the supply port (dil) of the pipe (d
) is gradually moved from the starting end to the ending end.During this movement, the water vapor heats and pressurizes the tube (1), so
The tube (1) softens and expands, loses almost all its restoring force, and comes into complete contact with the inner surface of the conduit (a), and thereafter maintains this state of complete contact. If a hot-melt type adhesive is used, it is melted by steam heating.

A tube based on heating and pressurizing water vapor (1)
As the complete adhesion progresses, the conduit (a) and tube (1)
Excess adhesive and air are pushed out in the direction of travel between the After stew lining the entire length of pipe (a), the adhesive is heated and cured for a specified period of time while maintaining the pressure of water vapor in pipe (-). Thereafter, the process m is completed by cooling the inside of the pipe (d) while maintaining it at a predetermined pressure, for example, a pressure slightly higher than the pressure of water vapor to increase the hardness of the adhesive.

In the present invention, water vapor is most preferable as the fluid used for heating and pressurizing the Rini:/ditube in view of equipment and workability, but other fluids such as air and water may also be used.

The temperature of the pressurized heated fluid supplied into the pipe line may be a temperature that can soften the tube, for example, in the case of steam, it is in the range of about 80°C to 110''C. The selection is made as appropriate, taking into consideration the softening point and melting point of the tube.

In addition, the pressure inside the pipeline only needs to be large enough to expand the tube in a softened state so that it comes into close contact with the inner surface of the pipeline, and is usually 0.3 to 4/d to 1.3/d ( Gauge EE
) is selected as appropriate from the range of degrees.

Also, the air pressure supplied into the pipeline to apply the spray to the pig is slightly lower than the heated pressurized fluid pressure, for example, by 0.
For example, the size is set to be small by about 9/d to 1 to 0.5, so that the edge moves at a low speed of about 5 to IOm/min in the pipe line due to the differential pressure. As a control means for the moving speed of the piping circle, for example, a rope (b□
) control means may be adopted.

According to the construction method of the present invention, tube lining is carried out gradually from the beginning end to the end end by circular movement of the pipe.
Since we use a method that expands the tube under pressure while it is heated and softened, the air between the conduit and the tube is completely removed, and no air pockets are formed within the linen. It has the characteristic of producing high quality tube lining.

[Brief explanation of drawings]

1 to 4 are schematic explanatory diagrams showing an example of the construction method of the present invention in the order of steps, and FIG. 5 is a schematic explanatory diagram showing an example of control means using lobe traction. In the figure, (1) is the crawling tube, (2) is the belt, (3) is the joint, and (4) is the elbow. (that's all)

Claims (1)

[Claims] (1) Insert a thermoplastic lining tube with a smaller diameter than the pipe line and coated with adhesive on the outer circumferential surface into the pipe line, install a pig inside the lining tube, and use the pig to control the supply inside the tube. A conduit characterized in that, while controlling the moving speed of the heated pressurized fluid within the tube, as the heated pressurized fluid moves within the tube, the tube is brought into close contact with the inner surface of the conduit and lined in a softened and expanded state. inner lining method.