JPH10244592A - Formation of lining pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for forming a lining pipe cable of lining smoothly by relieving stress generated in the strip member during the pipe manufacturing time in particular, preventing troubles such as cracks of the strip member during the pipe manufacturing time at a low temperature environment. SOLUTION: In the duct, a long-sized strip member 10 formed with joints 10A, 10B at its both end peripheries is fed continuously and wound spirally, a tubular body formed by joining mutually between the adjacent joints 10A, 10B is left therein, and a lining tube is additionally formed with a strip member fed newly in front of the ready-formed tubular body. A lubricant is applied prior to joining on the joints 10A, 10B of the strip member 10 for reducing frictional forces generated between the strip members 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining pipe manufacturing method for applying a lining layer to an inner surface of an existing sewer such as a sewer pipe, a water pipe, and a gas pipe. The present invention relates to a lining pipe manufacturing method in which a lining pipe is formed by inserting a so-called lining pipe into a culvert by forming a tubular body formed by spirally winding a strip-shaped member.

[0002]

2. Description of the Related Art The present applicant has formed a tubular body by spirally winding a belt-like member in a duct and joining the side edges of the belt-like members adjacent to each other. A lining construction method was proposed for a sewer lining the inner peripheral surface of a pipeline (Japanese Patent Application No. 7-91650).
issue). According to this technique, the present invention can be applied to not only a pipe having a circular cross section but also a rectangular or other free cross section.

[0003] The material of the belt-shaped member is not particularly limited and is often made of synthetic resin, but it is technically possible to use metal. However, in actual construction, cost,
In consideration of moldability and the like, a synthetic resin, particularly a hard vinyl chloride resin or a combination thereof with a metal is often used.

[0004] Rigid vinyl chloride resin is expensive, moldable,
It is a very suitable material in terms of strength and the like. However, not only hard vinyl chloride resin but also synthetic resin has a large property change due to temperature change, and has a disadvantage that the resin itself becomes brittle and easily cracked, especially when the temperature is lowered.

In the above-mentioned construction method, it is necessary to secure a certain degree of water stopping performance of the lining pipe, so that the surface pressure of the contact surface at the joint of the belt-shaped members must also be secured. Therefore, the frictional force in the direction in which the belt-shaped members slide is increased, and it is quite difficult to slide the belt-shaped members in the length direction.
Therefore, once the ridge and the concave groove have been fitted, the joint does not slip, so that the circumferential length of the lining tube does not easily change.

[0006] The pipe-making apparatus is of a type in which the pipe is wound around a guide that regulates the inner diameter of the lining pipe. Therefore, once the pipe is made to have a shorter circumference, the guide passes through the pipe while widening the inner diameter. As a result, an excessive tensile tension is generated in the belt-shaped member. This is one of the major causes of the breakage of the strip at low temperatures.

[0007] If the ridge has a large friction when entering the groove, the ridge becomes caught and becomes difficult to enter, and when the ridge is pushed in, extra stress is generated in the groove. This is also one of the causes of the crack of the belt-shaped member at low temperatures.

[0008] Further, when being wound around a tubular body, a bending stress is generated because it is forcibly bent. Further, when forming a tube into a tubular body, the band-shaped member is formed while being pulled from the rear of the tube-forming machine, and a tensile stress is generated in the band-shaped member.

Therefore, all stresses are generated at the joint of the belt-shaped members during the pipe production. As described above, at the time of construction, if the surroundings are at a low temperature, the belt-shaped member may be broken by the generated stress, and it may be impossible to continue pipe production.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, relieves the stress generated in the strip at the time of pipe making, and particularly, cracks the strip at the time of pipe making in a low temperature environment. The purpose of the present invention is to provide a lining pipe manufacturing method capable of preventing troubles such as the above and smoothly performing lining.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a long strip-shaped member having joints formed on both side edges is continuously supplied and spirally wound in a duct, and the adjacent joints are provided. Leaving a tubular body formed by joining the parts to each other,
A lining pipe manufacturing method for additionally forming a lining pipe with a newly supplied strip-shaped member in front of the already formed tubular body, comprising a lubricant for reducing a frictional force between strip-shaped members at a joint of the strip-shaped members. Is applied to the lining tube before joining.

In the present invention, the belt-shaped member is formed in a flat plate shape having a constant thickness, and a joining portion is formed on both side edges thereof, which is spirally wound, so that the joining portions which are in contact with each other can be joined. What is used is used. As the material of the belt-shaped member, a synthetic resin such as a hard vinyl chloride resin, which can be continuously molded by extrusion from the viewpoint of moldability, is suitably used.

In the present invention, the lubricant is used for reducing the frictional force between the band-shaped members at the joint of the band-shaped members, and can reduce the friction coefficient between the band-shaped members. Any material can be used without any particular limitation, but it is desirable that the material does not deteriorate the synthetic resin as the material of the belt-like member or the rubber as the material of the seal member. Specifically, surfactants such as liquid detergents and soaps, and lubricants composed of animal and plant or mineral oils and fats are used.

In the present invention, the application of the lubricant to the joint of the belt-shaped member is performed before the lubricant reaches the pipe making machine. In other words, any time before the pipe is formed, the band-shaped member may be applied at the time of production or immediately after the production, or an apparatus for supplying the band-shaped member at the time of pipe-forming work, specifically, a band-shaped member may be used. The coating may be performed at an appropriate place where the band-shaped member passes between the wound drum, the container containing the band-shaped member, and the like to the pipe-making machine. However, when there is a possibility that the lubricant may be removed due to the belt-like member passing through the water before reaching the pipe making machine, the lubricant should be applied immediately before the pipe making machine.

The portion of the belt-like member to which the lubricant is to be applied is the part where the belt-like member comes into contact, but there is no problem if the lubricant slightly extends beyond that part. The amount of the lubricant to be applied may spread over the entire contacting portion, and if it is more than that, there is no problem even if the amount of the lubricant is slightly increased. As a method of applying the lubricant, any method such as a method of applying manually by a brush, a spray, or the like, and a method of automatically applying the lubricant by an application device may be adopted.

[0016]

According to the method for producing a lining pipe of the present invention, a lubricating material for reducing the frictional force between the band-like members is provided at the joint of the band-like members.
By applying before joining, the band-shaped member is spirally wound, and when the adjacent joints are mutually joined,
Since the coefficient of friction at the part where the belt-shaped members contact each other is reduced, the diameter of the lining pipe can be changed even after the pipe is made.For example, the diameter of the lining pipe was smaller than the diameter of the guide of the pipe making machine. In this case, even when the guide passes, the diameter of the lining pipe is widened so that the guide can pass without difficulty, and no excessive tensile stress is generated in the belt-shaped member. In addition, when the convex portion of the fitting portion of the band-shaped member enters the concave groove of the adjacent band-shaped member, it becomes easy to enter because the coefficient of friction is small, and excessive force is applied to the band-shaped member due to excessive force. Is also reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a belt-shaped member used in the present invention. The belt-shaped member 10 has a main body in the shape of a flat plate having a constant thickness, and an appropriate number (three in FIG. 1) of ridges 11 are continuously erected in the longitudinal direction of the outer surface thereof. A flange 11 a is formed at the tip of the ridge 11.
A groove 12 or a groove space is formed between the ridges 11. The inner surface 13 is formed substantially smooth.

Bonding portions 10A and 10B are formed on both sides of the belt-shaped member 10 so as to overlap and engage with each other.
That is, the front edge side joint portion 10A is provided such that the base of the protruding ridge 11A at the front end thereof is expanded and the concave groove 14 is opened downward from the inner surface side.
5 are connected in series. The trailing edge-side joint 10B is provided with an overhang 16 extending from the trailing edge 11B. Near the end of the overhang 16 is a protrusion 17 that engages with the groove 14 of the front edge-side joint 10A. It is erected. A seal member 18 is adhered on the overhang portion 16.

FIG. 2 is a front view for explaining an example of the tube making machine used in the present invention. The pipe making machine 20 has a predetermined width, a forming frame 21 which forms a bendable annular body with a link mechanism constituted by a plurality of link bodies, and is disposed on each shaft of the link mechanism of the forming frame 21. A plurality of guide rollers 22 and a joining mechanism 23 including an outer roller 231 and an inner roller 232. The band-shaped member 10 is spirally wound, and a lining tube is formed while sandwiching the band-shaped member between the outer roller 231 and the inner roller 232 of the joining mechanism 23.

That is, at the time of joining, as shown in FIG. 3, the front edge and the rear edge of the adjacent belt-shaped members 10 overlap,
A front edge side joining portion 10A is connected to a rear edge side joining portion 10B by the outer roller 231 and the inner roller 23 of the joining mechanism portion 23 shown in FIG.
2, a ridge 17 is formed in the concave groove 14 by the pinching action with
The protrusions 15B are joined so that the ends of the protrusions 15 are fitted into the flanges 11a of the protrusions 11B. In this case, the main engagement is performed by the concave groove 14 and the ridge 17, and the flange 11a of the ridge 11B and the overhang 15 are subordinate, and therefore, depending on the case, the subordinate joint may be omitted. .

Further, in the present embodiment, a seal member 18 is interposed at the abutting portions of the overhang portions 15 and 16 to enhance the sealing performance and the engagement performance. The sealing performance at the joining portions 10A and 10B is also improved. And if the engagement is sufficient, as shown in FIG.
The sealing member can be omitted.

At this time, as shown in FIG.
The lubricant is applied to the abutting portion of the overhang portion 15 from the inside of the concave groove 14 of the leading edge side joint portion 10A of the belt-shaped member 10 and the abutting portion of the overhang portion 16 centering on the ridge 17 of the trailing edge side joint portion 10B. 19 is applied. Thereby, when the band-shaped member 10 is spirally wound and the adjacent joints 10A and 10B are mutually joined, the joints 10A and 10A of the band-shaped members 10 are joined to each other.
Since the coefficient of friction between B becomes smaller, the diameter of the lining pipe can be changed even after pipe production.

For example, if the diameter of the lining pipe is smaller than the diameter of the guide of the pipe making machine, the diameter of the lining pipe is widened even when the guide passes, and it can pass without difficulty. No stress is generated. or,
When the ridge 17 of the joint 10B enters the concave groove 14 of the joint 10A, it is easy to enter because the coefficient of friction is small, and it is less likely that excessive force is applied to the belt-shaped member 10 due to excessive force.

Next, a process of lining the inner surface of an existing sewer with the pipe-forming machine shown in FIG. 2 using the strip member 30 shown in FIG. 6A will be described. As shown in FIG. 6B, the main member 31 is divided into an inner roller 232 and an outer roller 231.
Spirally while pulling out with. And the joint 3
When 1B and the joining portion 31A at the back of one round (one pitch) are abutted, a fitting groove 31C is formed.

The fitting member 32 is pulled out by the inner roller 232 and the outer roller 231 while being pinched, and is fitted into the fitting groove 31C formed as described above, so that the joining portion of the main members 31 which are in contact with each other is joined. 31A and 31B are joined. As a result, the main member 31 is continuously joined in a spiral manner by the fitting member 32 to form a lining pipe, and the inner surface of the existing sewer is lined.

At this time, before joining, the joint 3
A lubricant (not shown) is applied to the contact portions of 1A, 31B and fitting member 32. Thereby, when the main material 31 is spirally wound and the adjacent joining portions 31A and 31B are joined to each other, the joining portions 31A and 31A of the main materials 31 are joined to each other.
Since the coefficient of friction between 31B becomes small, the diameter of the lining pipe can be changed even after pipe production.

[0027]

The present invention will be described below with reference to examples. In Examples 1 to 12 , two types of band-shaped members were used, one made of hard vinyl chloride resin, having rubber as a sealing member 18 shown in FIG. 1, and one having no sealing member as shown in FIG. .

As lubricants, three kinds of detergents for household kitchen, mineral oil-based lubricant and vegetable oil-based lubricant (salad oil) were used. The lubricant was applied to the belt-shaped member in two types, one applied when the belt-shaped member was wound around the drum, and one applied before the pipe-forming work. The method of application was such that a detergent and salad oil were applied with a brush, and a mineral oil and fat lubricant was applied with a spray.

The pipe making operation was performed according to the steps described with reference to FIGS. The pipe making conditions are: ambient temperature -10
° C, tube diameter 1000 mm, tube speed 15 cm / min,
The pipe making distance is about 10 m. Table 1 shows the pipe production results at that time.

Comparative Examples 1 and 2 A pipe making operation was performed in the same manner as in the example except that no lubricant was used. Table 1 shows the results of pipe production at that time.

[0031]

[Table 1]

As is clear from Table 1, in Examples 1 to 12 of the present invention, there was no abnormality in the pipe production results, while in Comparative Examples 1 and 2, In all cases, cracks occurred in the fitting portions of the belt-shaped members during pipe production.

[0033]

As described above, the method for producing a lining pipe according to the present invention, which is constructed as described above, relieves the stress generated in the belt-like member at the time of producing the pipe, and in particular, the crack of the belt-like member at the time of producing the pipe in a low-temperature environment. And other troubles can be prevented, and lining can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a belt-shaped member used in the present invention.

FIG. 2 is a cross-sectional view illustrating steps of a lining pipe manufacturing method of the present invention using the belt-shaped member shown in FIG.

FIG. 3 is a cross-sectional view showing a state in which adjacent joining portions of a belt-shaped member are joined with a sealing member interposed therebetween.

FIG. 4 is a cross-sectional view showing a state where a lubricant is applied to a joint of the belt-shaped members shown in FIG.

FIG. 5 is a cross-sectional view showing a state in which adjacent joining portions of the belt-shaped member are joined without providing a sealing member.

FIG. 6A is a cross-sectional view showing another example of the belt-shaped member used in the present invention, and FIG. 6B is a step of lining the inner surface of an existing sewer with the belt-shaped member shown in FIG. It is a perspective view explaining.

[Explanation of symbols]

 10, 30 Belt-shaped member 10A, 10B, 30A, 30B Joint portion 11, 17 Ridge 14, Depressed groove 15, 16 Overhang portion 18, Seal member 19 Lubricant 31, Main material 32 Fitting material

Claims (1)

[Claims] In a sewer, a long strip-shaped member having joints formed on both side edges is continuously supplied and spirally wound to form a joint between adjacent joints. A lining pipe manufacturing method in which the formed tubular body is left and a lining pipe is additionally formed with a newly supplied band-shaped member in front of the already formed tubular body. A method for producing a lining pipe, characterized in that a lubricant for reducing frictional force is applied before joining.