JP4037558B2 - Strip-shaped member for spiral tube formation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a strip-shaped member for forming a helical pipe for rehabilitating an existing pipe including an aging curved portion such as a water and sewage pipe and a gas pipe.
[0002]
[Prior art]
Metal pipes and fume pipes have long been used for existing pipes used as water and sewage systems and gas pipes. Such existing pipes may become obsolete due to long-term use and may leak due to cracks or corrosion. For this reason, recently, synthetic resin pipes have been inserted into existing pipes such as aged buried pipes for lining.
[0003]
For example, as described in Japanese Patent Publication No. 3-48392, an existing pipe is formed by a spiral pipe formed by spirally winding a strip made of a synthetic resin around one of the existing pipe lining methods. A method of lining is known. In this method, an existing pipe lining strip is wound in a spiral shape and the adjacent side edges are brought into an engaged state to form a helical pipe, and the inner surface of the existing pipe is lined by the helical pipe. It is supposed to be.
[0004]
In the existing pipe lining strip, for example, when a spiral pipe is inserted along a curved existing pipe, the inner peripheral surface of the existing pipe comes into contact with the spiral pipe, so that a large resistance acts on the spiral pipe. For this reason, by sequentially feeding the strips to the spiral tube, a propulsive force in the spiral direction acts on the strips constituting the spiral tube, and a force is applied to the spiral tube to expand the diameter. As a result, a large tensile force acts in the width direction of the band-shaped body constituting the helical tube, and the engagement state between the side edges of the band-shaped body is released by the tensile force, and the helical tube may be damaged. There is.
[0005]
In order to solve the above problem, as described in Japanese Patent Application Laid-Open No. 8-75042, means for connecting the strips with a joiner and giving the joiner an expansion / contraction function has been proposed.
[0006]
That is, as shown in FIG. 6, a joiner b made of soft vinyl chloride resin is provided between the strips a and a, and the protrusions c and c of the joiner b are inserted into the grooves d and d of the strip a. Thus, the strips a and a are joined to form a spiral tube, and the bending of the bending deformation portion e of the joiner b can be adapted to cope with the bending of the existing tube.
[0007]
However, the above-described spiral tube is effective when the curvature of the existing tube is not so large, but when the curvature of the existing tube is increased, the width of the strip plate needs to be reduced. As a result of using a small strip shape, there was a drawback that the reduction in construction efficiency was inevitable. In addition, the use of this narrow strip for rehabilitating the straight pipe portion has not been able to be achieved in terms of construction efficiency.
[0008]
[Problems to be solved by the invention]
The present invention eliminates the above-mentioned conventional problems, can be used for rehabilitation of a straight pipe portion of an existing pipe having a bending portion, and even if the bending curvature of the bending portion increases, the band plate The object of the present invention is to provide a strip-shaped member for forming a helical tube that can be used for rehabilitation of a curved portion that does not require a reduction in the width of the member and does not cause a decrease in construction efficiency.
[0009]
[Means for Solving the Problems]
In the present invention, a joining portion is erected on one side of both side edge portions of the belt-like substrate, and spirally wound by joining spirally so that the other surface of the belt-like substrate is on the inside and joining them together. A strip-shaped member for forming a spiral tube capable of forming a tube, wherein a narrow groove is provided along a longitudinal direction on one side of the strip-shaped substrate, and the narrow groove on the other surface of the strip-shaped substrate is provided. A strip-shaped member for forming a helical tube in which two narrow grooves are provided along the longitudinal direction on both sides, and the narrow grooves can be bent along the longitudinal direction. .
[0010]
[Action]
In the strip-shaped member for forming a spiral tube of the present invention, a narrow groove is provided along the longitudinal direction on one surface of the strip substrate, and a longitudinal groove is formed on both sides of the narrow groove on the other surface of the strip substrate. Two narrow grooves are provided along the direction, and these narrow grooves can be bent along the longitudinal direction so that they cannot be folded at the narrow grooves of the belt-like substrate. A straight spiral tube for straight pipe rehabilitation of existing pipes can be formed by joining the joints that are wound in a straight state and in contact with each other, and at the narrow groove portion of the belt-like substrate A spiral tube having an expansion / contraction portion for renovating a curved portion of an existing tube can be formed by joining the joint portions that are wound and in contact with each other in a bent state. In the bending portion, even if a tensile force acts on the belt-like member, the bent stretchable portion is expanded in the width direction, and the tensile force is absorbed. As a result, even when the curvature of the curved portion of the existing pipe is large, it can be dealt with by the deformation of the telescopic portion. In addition, since the straight pipe portion and the curved portion of the existing pipe can be rehabilitated by a spiral pipe formed using the same material, it is necessary to perform an operation of cutting or connecting as compared with the case of using different strip-like members. Because there is no, workability is very good.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an example of an embodiment of a strip-shaped member for forming a helical tube of the present invention.
As shown in FIG. 1, the spiral tube forming strip-shaped member 1 is provided with a ridge 12, which is one engaging portion, standing on one side of one side edge of the strip-shaped substrate 11. The ridge 12 includes a support column 121 and an insertion portion 122 having a circular cross section provided at the tip thereof.
[0012]
A step portion 13 is provided on the other side surface of the other side edge portion of the belt-like substrate 11 along the longitudinal direction at an appropriate distance from the end edge, and the step portion 13 is provided with another joint portion protruding to the one surface side. A certain groove 14 is erected. The recessed groove portion 14 is composed of an inserted portion 141 and a flange portion 142 which are open to the other side and open to the back.
Two ribs 15, 15 having a T-shaped cross section are erected between the protrusion 12 on one side of the belt-like substrate 11 and the groove 14.
[0013]
A narrow groove 16 is provided along the longitudinal direction between the two ribs 15 on one side of the belt-like substrate 11, and along the narrow groove 16 as shown in FIG. It can be bent.
On the other side of the belt-like substrate 11, two narrow grooves 17 and 17 are provided along the longitudinal direction on both sides of the narrow groove 16 provided on one side. As also shown, it can be bent along the narrow concave grooves 17 and 17.
Reference numeral 18 denotes a sealing material provided on one side of the belt-like substrate 11.
[0014]
As shown in FIGS. 3 and 4, when the other side of the belt-like substrate 11 is wound, the insertion portion of the protrusion 12 is inserted into the insertion portion 141 of the concave groove portion 14 that is adjacent to the belt-like substrate 11. A spiral tube can be formed by inserting 122.
FIG. 3 shows a joining state in the case of forming the straight pipe portion of the spiral tube, and FIG. 4 shows a joining state in the case of forming the curved portion of the spiral tube.
[0015]
Hereinafter, an example of rehabilitating an existing pipe including a curved portion using the spiral pipe forming strip-like member 1 shown in FIG. 1 will be described with reference to FIGS.
5A to 5C, P is an existing pipe rehabilitated by the strip-shaped member 1 for forming a helical tube shown in FIG. 1, P1 is a straight pipe portion, P2 is a curved portion, and P3 is a straight pipe portion. is there. R is a helical tube provided in the existing pipe P for rehabilitating the inside thereof, and is formed by a helical tube forming strip member 1 shown in FIG.
[0016]
As shown in FIG. 5 (a), R1 is a spiral tube provided in the straight tube portion P1 of the existing tube P, and the spiral tube forming strip member 1 shown in FIG. As shown in FIG. 5, the insertion portion 122 of the ridge 12 is joined so as to be inserted into the insertion portion 142 of the adjacent concave groove portion 14. At this time, the belt-like substrate 11 is used in a straight state without being bent along the narrow concave grooves 16, 17, and 17, and the formed spiral tube R1 is also in a straight state.
[0017]
As shown in FIG. 5 (b), R2 is a spiral tube provided in the straight pipe portion P2 of the existing tube P. As shown in FIG. 2, the strip-shaped member 1 for forming the spiral tube shown in FIG. 11 is formed into a spiral tube forming belt-shaped member 1 ′ that is bent along 11 narrow grooves 16, 17, 17. It forms by joining so that the insertion part 122 of the protrusion 12 may be inserted in. At this time, the formed spiral tube R <b> 2 has an expansion / contraction portion that is bent along the narrow grooves 16, 17, 17 of the belt-like substrate 11.
[0018]
Thereby, even if a tensile force is applied to the belt-like member, the stretchable portion is expanded in the width direction, and the tensile force is absorbed. As a result, even when the curvature of the curved portion of the existing pipe is large, it can be dealt with by the deformation of the telescopic portion.
[0019]
As shown in FIG. 5 (c), R3 is a spiral tube provided in the straight tube portion P3 of the existing tube P, and the spiral tube forming strip member 1 shown in FIG. As shown in FIG. 5, the insertion portion 122 of the ridge 12 is joined so as to be inserted into the insertion portion 142 of the adjacent concave groove portion 14. At this time, the belt-like substrate 11 is used in a straight state without being bent along the narrow concave grooves 16, 17, and 17, and the formed spiral tube R1 is also in a straight state.
[0020]
【The invention's effect】
Since the strip-shaped member for forming a spiral tube according to the present invention is as described above, it is possible to form a spiral tube having a stretchable portion bent along a narrow groove in the curved portion of an existing tube. Therefore, even if a tensile force acts on the belt-like member, even if the curvature is large, it can be dealt with by deformation of the expansion / contraction part, and the straight pipe part and the curved part of the existing pipe are made of the same material. Since it can be rehabilitated, workability is very good.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a strip-shaped member for forming a helical tube of the present invention.
2 is a cross-sectional view showing a deformed state of a spiral tube forming strip member shown in FIG. 1. FIG.
FIG. 3 is a cross-sectional view showing a connection state of joint portions of a spiral tube formed by winding the spiral tube forming belt-shaped member shown in FIG. 1;
4 is a cross-sectional view showing a connection state of joint portions of a spiral tube formed by winding a spiral tube-forming belt-like member in the state shown in FIG. 2. FIG.
5 is a cross-sectional view illustrating a state in which an existing pipe having a curved portion is rehabilitated by a spiral pipe formed using the spiral pipe forming belt-like member shown in FIG.
FIG. 6 is a cross-sectional view showing a helical tube formed using a conventional belt-like body.
[Explanation of symbols]
1, 1 'Strip-shaped member 11 for forming a helical tube 11 Strip-shaped substrate 12 Projection 14 Concave groove 15 Ribs 16, 17 Narrow groove 121 Insertion part 141 Insertion part

Claims (1)

A joining portion is erected on one side of both side edges of the belt-like substrate, and a spiral tube is formed by joining the joining portions that are spirally wound and in contact with each other so that the other surface of the belt-like substrate is inside. A strip-shaped member for forming a spiral tube, wherein a narrow groove is provided on one side of the strip substrate along the longitudinal direction, and on both sides of the narrow groove on the other side of the strip substrate. A strip-shaped member for forming a helical tube, characterized in that two narrow grooves are provided along the longitudinal direction, and the narrow groove portions are foldable along the longitudinal direction.

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