JPH09152059A - Method for lining for existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly propel a spiral pipe into an existing pipe without damaging the spiral pipe and increasing its diameter even if sewage or the like containing oil and fat have collected in the existing pipe. SOLUTION: A strip 10 is continuously fed into a pipe manufacturing machine 20 installed within a vertical shaft 30, and as a junction is made using a recess and a projection 13a which are formed at the side edge of the strip 10 using pipe manufacturing rollers 21a, 21b..., a spiral pipe 40 is constructed. In this case, prior to making the junction, water is ejected from a feedwater pipe 23a to wash off oil and fat and dust or the like that cling to the surface of the junction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for lining an existing pipe that has been deteriorated, and more particularly to a continuous strip-shaped body mainly made of synthetic resin. The present invention relates to a lining method for an existing pipe in which a spiral pipe is formed by spirally winding the spiral pipe, and the spiral pipe is sequentially inserted into the existing pipe for lining.

[0002]

2. Description of the Related Art Conventionally, metal pipes and fume pipes have long been used for existing pipes used as waterworks and sewers. Such existing pipes may deteriorate due to long-term use and may leak due to cracking or corrosion. Therefore, in order to rectify this existing pipe, recently, a method of inserting a synthetic resin pipe into the existing pipe and lining it has been adopted.

One of the lining methods is to form a spiral tube by spirally winding a long strip mainly made of synthetic resin and continuously feeding the spiral tube into an existing tube. There is a method of lining. This method is disclosed, for example, in Japanese Examined Patent Publication No. 3-48392.

That is, this method is carried out by installing a pipe-making machine in one standing hole of an existing pipeline so that the open end of the existing pipe is exposed. The pipe making machine is equipped with a pipe making roller, and by using this, a groove provided along one side edge of the strip is provided along the other side edge. By fitting the ridges, the side edges are joined to each other to form a spiral tube, and the formed spiral tube is sequentially fed into the existing tube.

The joining of the side edge portions described in the above publication has a structure in which the side edge portions of the strips overlap each other, but in addition, half-divided convex ribs are formed along both side edges of the strips. When spirally winding with a pipe making machine, the convex ribs of the half-divided shape are butted against each other to form one convex strip, which can be fitted to this convex strip when joining the side edge portions. There is also a method in which a strip material having a concave strip is separately prepared, and the strip material is simultaneously sent to a pipe making machine and joined by fitting the concave and convex strips together.

In any case, the spiral tube thus formed is propelled while rotating in the existing tube, and stops when it reaches the other vertical hole. In some cases, a backfill material such as cement mortar is filled and fixed between the outer peripheral surface of the spiral pipe and the inner peripheral surface of the existing pipe.

[0007]

However, when such a lining construction method is used, the strip body is usually wound in a spiral shape because it is usually constructed with the water containing accumulated water in the lower part of the water supply or sewer. By the time the spiral tube is formed, the strip is once immersed in this accumulated water. Therefore,
The accumulated water adheres to the surface of the joint portion, which is formed on the strip-shaped body and is formed of concavo-convex strips and the like. Particularly in the case of a sewer pipe, the sewage contains a large amount of oil and fat components and the like, and is more slippery.

Therefore, when the side edges are joined to each other to form a spiral tube, the frictional resistance at the joints is reduced and the functions are not fulfilled. The fitted concave and convex lines start to slide out, and the diameter of the spiral tube increases. When such a tendency becomes severe, it is difficult to form a spiral tube having a desired diameter in the pipe making machine, and even if it is formed by the pipe making machine, the diameter is expanded during rotation / propulsion. The contact resistance between the spiral pipe and the existing pipe increases, not only the spiral pipe is damaged, but also the rotation and propulsion are not smoothly performed. In such a case, there is a problem that it is not possible to carry out the construction, especially in the case of an existing pipe having a large diameter and a long distance, regardless of the case of the short distance.

The present invention solves the problems of the prior art described above, and even if there is accumulated water in the existing pipe, the spiral pipe can be smoothly propelled into the existing pipe without expanding its diameter. It is an object of the present invention to provide a lining construction method for an existing pipe that does not damage the pipe.

[0010]

According to the existing pipe lining method of the present invention, "a long strip is continuously wound and spirally wound, and side edges of the strip are joined to form a spiral pipe. In the lining construction method of the existing pipe, which is formed so as to sequentially feed the formed spiral pipe into the existing pipe, immediately before the joining, the joint is washed with a fluid ''. This achieves the above object.

The existing pipes subject to the existing pipe lining method of the present invention include not only underground pipes, but also ground pipes, subsea pipes, etc. that have already been constructed to form a predetermined pipeline. To do. Further, the material is not limited to concrete pipes and metal pipes, but any material such as earth pipes and synthetic resin pipes can be used.

The means for cleaning the joint portion with a fluid as referred to in the present invention is a method of washing by removing air or water by flowing or jetting the adhered portion to the joint portion, or a method of cleaning the joint portion. There is a method in which a portion immediately above the portion to be sucked is sucked to form a negative pressure, and the suction force is used to suck the adhering substances on the surface for cleaning.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an existing pipe lining method according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially cutaway schematic explanatory view showing an entire embodiment of the method of the present invention.
(A) is an enlarged right side view of the pipe manufacturing machine in the same as above, and (B) is a perspective view of only the spiral pipe forming portion.

The existing pipe lining method shown in the drawing is a concrete sewer pipe P which is an existing pipe buried underground.
This is an example adopted in the case of rectifying.

As the elongated strip used in the present invention, for example, a strip having a cross-sectional shape as shown in FIG. 3 is used. The strip-shaped body 10 has a concave strip 12a provided along one side edge of the substrate 11 and a convex strip 13a provided along the other side edge. The ridge 13a is formed by opening inward of the spiral tube to be formed.
Are formed so as to project outward of the spiral tube to be formed.

Then, these uneven lines 12a, 13a
When spirally winding the strip 10 into a spiral tube,
Both side edge portions are overlapped with each other, and the convex strip 13a is forcibly fitted into the concave strip 12a so that they can be firmly joined.

Examples of the material of the strip 10 include polyvinyl chloride, polyethylene, polypropylene, polycarbonate, polyester, or so-called FRP in which reinforcing fibers such as glass fibers are mixed with these synthetic resins.

The edge of the other side edge portion provided with the convex strip 13a is an inclined surface 14a, and the substrate 11 located inside the recessed strip 12a at one side edge portion provided with the recessed strip 12a.
An inclined surface 14b that can be brought into close contact with the inclined surface 14a is formed on the substrate, and the substrate 11 is bent outward to form a step portion 15.

As shown in FIG. 4, the inner surfaces of the left and right substrates 11, 11 are flush with each other when the side edges of the wound strip 10 are overlapped with each other. . In addition, a pressing portion 16 that is inclined toward the outside of the spiral tube is continuously provided at the outer edge portion of the recess 12a.

Further, the strip-shaped body 10 has a concave strip 12 on the side where the concave strip 12a and the convex strip 13a are provided (on the outer surface side of the spiral tube).
A plurality of stiffening ribs 111, 111 having a T-shaped cross section are provided between the substrate a and the ridge 13a with a space therebetween.
1 is erected in the longitudinal direction. As shown in FIG. 4, the reinforcing ribs 111 adjacent to the ridges 13a have the pressing portions 1 when the side edges of the strip-shaped body 10 are overlapped and fitted together.
The tip of 6 abuts against or presses the back surface of the flange-shaped portion of the reinforcing rib 111.

In this way, if the joint portion formed by fitting the convex strip 13a to the recessed strip 12a is used as the main lock, the joint portion formed by the contact or pressing between the pressing portion 16 and the reinforcing rib 111 can be It functions as a block.

A non-slip member 17 made of an elastic material is attached to the substrate 11 inside the ridge 13a. The anti-slip material 17 is to reinforce the anti-slip function at the joint between the side edge portions and to reinforce the sealing function on the side edge facing surface, and natural rubber, synthetic rubber, soft synthetic resin, or the like. Made of elastic material in the shape of a band, adhesive beforehand,
It is adhered or fused at a predetermined position on the substrate 11 by a coextrusion molding method or the like.

Reference numeral 18 denotes a reinforcing member, which is formed by bending a long thin metal plate having flexibility and bending it into a W shape, and then once wound around a drum Db, as shown in FIG. At the time of pipe manufacturing, the strip-shaped body 10 is unwound and unwound at the same time, and is fitted between predetermined reinforcing ribs 111, 111. This reinforcement 18
May be mounted between all the reinforcing ribs, or may be mounted on a part thereof as in the present embodiment. The anti-slip material 17 and the reinforcing material 18 are not essential members for forming the spiral tube.

When lining is carried out using such a band-shaped body 10, as shown in FIG. 1, first, the existing pipe P to be calibrated is sandwiched and standing holes (manholes) 30, 30 are formed in the existing pipe line.
Drilling. If there is an existing vertical hole, it may be used.

Next, in one of the vertical holes 30, the existing pipe P
The pipe making machine 20 is installed at a position facing the open end of the. The pipe making machine 20 includes a plurality of pipe making rollers 21 as shown in FIG.
a, 21b ... are equipped. The pipe making roller 21
a, 21b, etc. are attached while holding a predetermined spiral angle. In FIG. 1, reference numeral 22 is a fitting roller for the reinforcing member 18 provided adjacent to the first pipe making roller 21a.

The drum Da of the strip 10 installed on the ground
The belt-shaped body 10 is continuously fed from the same, and the reinforcing material 18 is also continuously fed from the drum Db of the reinforcing material 18. Then, as shown in FIG. 4, the fitting roller 22 is used to fit the reinforcing material 18 between the predetermined reinforcing ribs 111, 111, while the pipe-making rollers 21a, 21b ,. It is curved in a circular tube shape and wound in a spiral shape.

At this time, as shown in FIG. 4, the concave strip 12 of the strip 10 introduced later is fitted into the convex strip 13a of the strip 10 previously wound in a spiral shape. By this fitting, the anti-slip material 17 is pressed and becomes flat, and at the same time, the tip of the pressing portion 16 is brought into contact with and locked to the back surface of the flange portion of the reinforcing rib 111. By continuously performing such an operation, the spiral pipe 40 is formed, and the spiral pipe 40 is sequentially propelled while rotating in the existing pipe P.

The above is the same as the conventional lining method, but in the present invention, the joining portion, that is, the ridge 13a and the anti-slip material 17 involved in joining in this embodiment.
The surfaces are cleaned with fluid just before joining.
In this embodiment, an example in which water is injected as shown in FIG. 2 is shown.

By the way, in FIG. 2, the spiral tube 40 rotates in the direction of the arrow, but the spiral tube 40 is deformed into a spiral shape by the tube-making roller 21a and the like, and the previously wound band-shaped body 10 always passes through the accumulated water W. . Therefore, as shown in FIG. 2B, water is jetted from the jet port (not shown) of the water supply pipe 23a to each surface of the ridges 13a and the like to wash off adhering substances such as oil and fat. is there. It is preferable that the jetting direction of the water is oblique so that the water drops in a direction opposite to the pipe-making roller 21a, which is the place where the projection 13a is fitted into the recess 12a.

When cleaning with negative pressure, the suction port of the suction pipe (not shown) is provided with the ridge 13a and the non-slip material 1.
7 is installed in close proximity to or close to 7, and a vacuum pump installed outside the apparatus makes the gap between the suction port and the ridge 13a negative so as to suck, and prevents adhered matter from entering the vacuum pump. In addition, a filter material or the like may be provided in the middle of the suction path and removed. At this time, if the suction force is too strong, the ridges 13a or the like may be attracted to the suction port, so care must be taken.

Next, another embodiment will be described with reference to FIG. In each of the examples shown in FIGS. 5 (a) and 5 (b), the semi-divided convex ribs 1 are formed along both side edges of the belt-shaped substrate 11.
When forming 131, 131, or 132, 132 and spirally winding them by a pipe making machine, this half-divided convex rib 1
31, 131, or 132, 132 are abutted against each other to form one ridge 13b or 13c.

When the side edges are joined together, the strips 19a and 19b having the recessed strips 12b and 12c which can be fitted into the projecting strips 13b and 13c are simultaneously sent to the pipe making machine to fit the recessed strips. It is joined by. FIG.
In the example shown in (b), as is clear from the figure, the band member 19b is such that the tip portion of its side edge also has a function as a sublock.

Further, in the case of the ridge 13b shown in FIG. 5 (a), since it is directed downward (inward of the spiral pipe), as shown in FIG. 4, washing from the outside of the pipe making machine 20 is not possible. This is sufficient, and in this case, it is preferable to install the water supply pipe 23b inside for cleaning as shown in FIG. 6, and depending on the shape of the joint, cleaning may be performed simultaneously from inside and outside.

The type, amount, pressure, etc. of the fluid required for cleaning are
The width is set appropriately in consideration of the width of the fitting concave-convex strips on the side edge portion, the winding speed of the strip (pipe-making speed), the type and amount of the deposit, and the like. Further, in the case of the present embodiment, an example using one water supply pipe is shown, but a plurality of these water supply pipes and suction pipes may be used if necessary.

[0036]

The existing pipe lining method of the present invention is
When forming the spiral tube, just before joining the side edge portions of the strip-shaped body, the joint portion is washed with a fluid, so that by the washing, deposits such as dirty water containing oil and fat components at the joint portion are removed. When the spiral tube is removed, or after the spiral tube is formed, the slip phenomenon does not occur at the joint, and the spiral tube is firmly joined by the friction resistance originally possessed to form the spiral tube,
Work such as sending into the existing pipe can be performed smoothly.

Therefore, even a long-distance pipe having a large diameter can be stably and continuously constructed while forming a lining pipe having a uniform diameter. Moreover, the equipment for cleaning the joint is simple and does not require any special equipment cost.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic explanatory view showing an entire embodiment of an invention relating to an existing pipe lining method.

FIG. 2A is an enlarged right side view of the pipe making machine, and FIG.
[Fig. 3] is a perspective view of only a spiral tube forming portion.

FIG. 3 is an enlarged cross-sectional view showing an example of a band-shaped body used for forming a spiral tube.

FIG. 4 is an enlarged cross-sectional view showing a state where the side edges of the strips are joined together.

5 (a) and 5 (b) are enlarged cross-sectional views showing other modes of joining the side edge portions of the band-shaped bodies to each other.

FIG. 6 is a right side view showing the position of the water supply pipe and its jetting direction, which is used when the side edge portions of the strips are joined to each other as shown in FIG. 5 (a).

[Explanation of symbols]

 Da Drum drum Db Reinforcement drum P Sewer pipe W Storm water 10 Strip 11 Substrate 12a, 12b, 12c Recessed strips 13a, 13b, 13c Convex strip 17 Non-slip material 18 Reinforcement material 19a, 19b Strip material 20 Pipe Machine 21a, 21b Pipe roller 22 Reinforcing material fitting roller 23 Water supply pipe 30 Vertical hole 40 Spiral pipe 111 Reinforcing rib 131, 132 Convex rib

Claims (1)

[Claims] 1. A long strip is continuously wound and spirally wound, side edges of the strip are joined together to form a spiral tube, and the formed spiral tube is sequentially fed into an existing tube. In the existing pipe lining construction method as described above, the existing pipe lining construction method is characterized in that the joint portion is washed with a fluid immediately before the joining.