JPS62246720A - Band-form member for lining underground laying pipe - Google Patents

Abstract

PURPOSE:To improve greatly the strength or the waterstop characteristics of the jointing part of a lining, by lining the inner surface of a pipe with a band-form member whose part for jointing is a specific form. CONSTITUTION:A band-form member 1 for lining is formed by an extrusion molding simultaneously and continuously where the member itself is molded from a vinyl chloride resin of an ordinary hardness and convex stripes 6a for water stop is molded from a flexible vinyl chloride resin. The connection is done as follows : beads 6b of inner joint portion 6 are respectively fit into the cocaved grooves 5a at the inside of an outer joint portion 5. Because the semi-circular arcuate head part of the beads 6b are larger in cross-sections than the semi-circular arcuate back part of the concaved grooves 5a, they are forcibly pressed into and become fitted closely. As the covex stripes 6a for water stop are flexible packing material, they get fit in the cocaved grooves 5a favorably, and whatever the lining pipe is bent they follow-up this deformation and any gap does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a belt-shaped member used for lining underground pipes such as sewer pipes, water supply pipes, and gas pipes buried underground. In particular, the present invention relates to a lining band member made of synthetic resin that is spirally lined on the inner surface of an existing old pipe to regenerate the pipe.

[Background of the invention] Sewerage pipes buried underground change over the years, and due to ground subsidence and the aging of the sewerage pipes themselves, gaps may form in the joints, or damage to the pipes themselves may occur. Water will enter from the outside through the gap.

As countermeasures, measures can be taken to prevent leaks in sewer pipes, replace old pipes with new pipes, or increase the processing capacity of sewage treatment plants, but none of these measures can be taken. The construction work is large-scale and expensive.

Furthermore, when a gap occurs in a water supply pipe, water leaks through the gap and valuable water resources flow out.

For this reason, in recent years, a method of lining existing old pipes on-site has been proposed. According to this, the total construction cost is economical because it can be carried out without newly excavating the site.

[Prior Art] From the above-mentioned viewpoint, the present applicant has disclosed in Japanese Patent Application No. 159541/1982 (hereinafter referred to as "prior art").

[At a position facing the underground pipeline in the vertical hole of the underground pipeline, the continuously supplied strip members are sequentially folded in the circumferential direction, and the side ends of the strip members are overlapped and spirally wound.] ``A method for lining an underground pipe, which is characterized in that the lining pipe is created by the method and the lining pipe is sent into the underground pipe.''

Furthermore, the one in FIG. 5 was presented as an embodiment of the band-like member used in the prior art. FIG. 5(a) shows a cross section of the single member, and FIG. 5(b) shows a cross section of the two in an engaged state.

Here, the strip member lO is continuously provided with trapezoidal protrusions 12 in a cross section perpendicular to the longitudinal direction, and between the protrusions 12 there are valleys 1.
Formed in 3. The protrusions 12 and the troughs 13 have equal pitches in the width direction, and after the strip member is spirally wound, the inner surface 14, which becomes the inner surface of the tube, is formed substantially smooth.

At both ends of the strip member IO, outer joint portions 15. An inner joint portion 16 is formed. That is, the protrusion 12A of the outer joint part 15 is formed in the same shape as the protrusion 12, and a round groove 15a is provided in the longitudinal direction on the inner surface side, and the protruding part 15b is wider than the width of the trough part 13. It has also been slightly lengthened. The length of the protruding part 16a of the inner joint part 16 is approximately the sum of the valley part 13 and the protrusion 12, and the outer joint part 15 is attached to the end of the protruding part 16a.
A round protrusion 16b that fits into the round groove 15a is provided in the longitudinal direction. In addition, a cut groove 16c is provided in the root portion of the protrusion 12 in the longitudinal direction.

At the time of joining, the outer joint part 15 is pressed against the inner joint part 16 by the joining roller R, and the round groove 15a has a round protrusion 16b, and the cut groove 160 has an overhang@15.
The ends of b are fitted into each other, and a roller is pressed against the overlapping portion.

However, the configuration of the strip member as an example thereof disclosed in the prior art is not perfect in terms of preventing leakage of water from the inside and outside.
6c and the overhang 15b, and the round groove 15a and the round protrusion 16b are not sufficient to prevent water from entering from inside and outside.This is due to distortion during fitting and molding. This appears to be caused by various reasons, such as discrepancies in dimensions at the time.

[Technical Section I11 of the Present Invention In view of the above-mentioned circumstances, the present invention solves the problem of the prior art described above by solving the problem of the water-stopping structure of the joint, and in particular, the material of the grooves and stripes that engage with each other has the same hardness as the strip member. Based on the knowledge that there is such a thing, the purpose (technical problem) is to provide a new joint structure of a band-shaped member that solves the problems of the above-mentioned prior art.

[Structure and operation of the present invention] In order to achieve the above object, the strip member for underground pipe lining of the present invention adopts the first structure (technical means), that is, the strip member is spirally wound to form a pipe. However, in a lining band member used as a lining pipe for an underground pipe,
(1) A protrusion formed to protrude from the upper surface of the strip member in the longitudinal direction of the strip member; an outer joint portion having two or more high locking protrusions, each of which has a groove in the longitudinal direction; , and an inner joint portion having protrusions that closely fit into grooves formed inside the locking protrusions in the longitudinal direction; It is characterized by being made of a packing material that is softer than that of the part.

The strip member is wound spirally to form a lining pipe, and the convex strips of the inner joint portion closely fit into the grooves of the outer joint portion at both ends of the strip member, providing strength and waterproof properties. Constructs a good joint part.

Water on the outside of the lining tube is prevented from entering the inside of the lining tube at the fitting portion between the convex strip and the groove having a packing function.

[Examples] Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

1 to 3 show an embodiment of the pipe lining strip member l of the present invention.

The band-shaped member 1 is formed long in the longitudinal direction and is manufactured, for example, from vinyl chloride resin using an extrusion molding method.

A plurality of protrusions 2 are provided on the outside of the strip member l in the width direction at equal intervals through troughs 3. In this embodiment, four protrusions 2 are provided.

The protrusions 2 are designed to withstand compression and bending stress in the diametrical direction when the strip member 1 is spirally wound to form a tube. The cross-sectional shape of the protrusion 2 is rectangular, square,
The protrusion 2 may be formed into a trapezoid or a circular arc.
It is possible to reduce the weight by appropriately providing a hollow section inside the holder.

After the strip member l is wound helically, the inner surface 4, which becomes the inner surface of the tube, is formed substantially smooth.

An outer joint part 5 and an inner joint part 6 are formed at both ends of the band-like member 1, which overlap and engage with each other inwardly and outwardly.

Two locking protrusions 2A are provided in parallel on the outer side of the outer joint portion 5. The locking protrusions 2A are provided with smaller intervals than the protrusions 2. However, as will be described later, the number of locking protrusions 2A may be one or more than two, as long as the locking protrusions 2A have a water-stop function and a mechanical fixing function. are not limited to the spacing between the protrusions 2, but can be set to any appropriate spacing as long as the water-stopping action and mechanical fixing action described above are achieved.

On the inside of each of the locking protrusions 2A, a groove 5a is provided in the longitudinal direction of the strip member l, the cross-sectional shape of which is a semi-circular arc at the inner part and a so-called mushroom shape with a narrow neck at the exit part. Further toward the end of the locking protrusion 2A, there is a projecting portion 5b.
is provided.

In addition, chamfered portions 5c are formed at the corners of the overhanging portion 5b.

The inner joint part 6 has a length sufficient to overlap its overhanging part 6a with the inside of the outer joint part 5, and two parallel protrusions 6b are protruded from the upper surface of the overhanging part 6a. . In order to fit into each of the grooves 5a of the outer joint portion 5, the ridge 6b has a cross-sectional shape of a semi-circular arc with an expanded diameter at the head portion 61 and a mushroom-shaped cross section with a narrow neck at the root portion 62. is formed. Either one of the protrusions 6b is made of a soft material. Furthermore, a cut groove 60 is formed in the longitudinal direction at the base of the protrusion 2 facing the inner joint part 6.

FIG. 2 shows the detailed structure of one embodiment of the inner joint portion 6. In this embodiment, the inner protrusion 6b is molded from a soft vinyl chloride resin and constitutes a so-called water-stop protrusion 6A. The head 61 of this water-stop ridge 6A is slightly larger in cross-section than the deep part of the groove 5a. The outer convex strip 6b is a band-shaped member l.
It is molded from the same synthetic resin as the main body, preferably vinyl chloride resin, and constitutes a so-called locking protrusion 6B. This locking protrusion 6B performs an engaging action.

Such a band-like member 1 is formed by simultaneous and continuous extrusion molding, with its main body made of vinyl chloride resin of normal hardness and the water-stop ridges 6A made of soft vinyl chloride resin to which a plasticizer has been added. Since both materials are of the same quality, their integrity can be fully achieved.

The strip member 1 is wound into a spiral shape by a predetermined method, and the ends thereof are overlapped with each other, and the outer joint portion 5 and the inner joint portion 6 are engaged to form a spiral lining tube.

FIG. 3 shows the engaged state.

That is, the protrusions 6b of the inner joint part 6 fit into the inner grooves 5a of the outer joint part 5, respectively. Since the semicircular arc-shaped head of the protruding strip 6b has a larger cross section than the semicircular arc-shaped inner part of the groove 5a, it is forcibly press-fitted and a close fit is achieved. In particular, since the water-stop protrusion 6A is a soft packing material, it fits well into the groove 5a, and no matter how the lining pipe bends, it follows this deformation and does not create a gap.

FIG. 4 shows another embodiment of the water-stopping protrusion 6A made of soft material.
In this embodiment, the head of the water-stopping protrusion 6A is attached to the neck of the piece using a sponge or rubber material.Since the water-stopping protrusion 6A is highly flexible, it has a higher water-stopping effect. This is carried out in a separate process after the main body of the strip member 1 is extruded.

The present invention is not limited to the above-described embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention.

(2) The shape of the inner part of the groove 5a and the head of the protruding strip 6b is not limited to a semicircular shape, but may take any other suitable shape (for example, triangular shape) within a range that provides the same effect.

[Effects of the Invention] Since the underground pipe lining strip member of the present invention has the above-mentioned configuration, it has the following unique effects.

(2) Since the outer joint portion and the inner joint portion are closely fitted with at least two grooves and a protrusion, a joint structure with high engagement strength and good water-stopping properties can be obtained.

- Since at least one of the plurality of protrusions is formed as a water-stop protrusion having soft packing properties, watertightness is further improved.

■ It is possible to prevent gaps caused by errors in the construction of the lining and dimensional errors in the molding of the band-shaped member with water-stop ridges made of soft synthetic resin.

[Brief explanation of drawings]

1 to 4 show an embodiment of the belt-like member for lining underground pipes of the present invention, FIG. 1 is a three-dimensional view of one embodiment of the belt-like member cut in the width direction, and FIG. 2 is a schematic view of the belt-like member. FIG. 3 is a developed view showing a joined state, and FIG. 4 is a diagram of another embodiment. Figure 5(a)(b)
) shows a cross-section of a prior art strip.

Claims (1)

[Scope of Claims] 1. In a lining band member for lining an underground pipe, the band member (1) is spirally wound to form a pipe, and the band member (1) is wound in a longitudinal direction. A protrusion (2) formed to protrude from the upper surface of the member, and the strip member (1)
At one end in the width direction, two or more locking protrusions (2) protrude from the upper surface of the strip member in the longitudinal direction and have the same height as the protrusions (2).
A), and a longitudinal groove (5a) is formed inside each of the locking protrusions (2A).
5), and a protrusion (5) that closely fits into a groove (5a) formed at the other end of the band-shaped member (1) in the width direction and inside the locking protrusion (2A) in the longitudinal direction. 6a), and at least one of the protrusions (6a) is made of a packing material softer than other parts of the strip member. Band-shaped member for buried pipe lining.