JP2014014959A - Belt-like body for spiral wound pipe formation and pipe renovation method using spiral wound pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt-like body for a spiral wound pipe formation that can maintain smoothness of an inner surface of the spiral wound pipe, in which even if the spiral wound pipe is elongated or contracted, water tightness can be maintained without breaking, and strength can be kept by injection of a filler; and a pipe renovation method using the spiral wound pipe.SOLUTION: A belt-like body for spiral wound pipe formation is provided with the belt-like body 10 that includes: a strip material 1 in which an elastic part 5 having a slack part 7 in a crosswise direction; and a cover strip material 2 having flexibility that covers the elastic part 5 becoming an inner peripheral surface side, and the spiral wound pipe is formed by those fitting parts 3 disposed at both sides of the crosswise direction of the belt-like body 10 are mutually fitted.

Description

  The present invention relates to a strip-like body for forming a spirally wound tube and a pipe rehabilitation method using the spirally wound tube, and more specifically, a slack that can be wound around an old sewage pipe or agricultural water pipe to rehabilitate the pipe. The present invention relates to a strip-shaped body for forming a spiral wound tube and a pipe rehabilitation method using the spiral wound tube.

  Conventionally, in order to rehabilitate old sewage pipes and agricultural water pipes, a spiral wound pipe is formed by joining the end parts in the width direction of ribbed strip materials and inserted into the old pipe while rotating or inside the old pipe In the method of joining the widthwise ends of the strip material with ribs to form a spiral wound tube, the spiral wound tube is installed in the old tube, and then cement milk is filled between the spiral wound tube and the old tube wall, It has been practiced to rehabilitate old pipes by hardening cement milk. Such rehabilitation methods for aging pipes are disclosed in Patent Documents 1 and 2.

  Most of the old sewage pipes and agricultural water pipes are made of concrete. If a spiral winding pipe is installed in the pipe and the cement milk is filled between the old sewage pipe or the agricultural water pipe and the spiral winding pipe and cured, the rigidity is increased. Highly monolithic conduit. However, monolithic pipes with high rigidity are vulnerable to ground changes and earthquakes. In addition, the existing pipes, which are old sewage pipes and agricultural water pipes, are pipes with joints, so the joints have the characteristics of absorbing changes in the ground and earthquakes, and changes in the joints of existing pipes. As a result, cracks may occur in the cement milk, which is a filler, and the engaging portion of the spirally wound tube may be disengaged.

  As a measure against the disengagement of the engaging part, when the expansion / contraction part is provided on the strip constituting the spiral wound tube, there is an effect of preventing the disengagement of the engaging part. When the stretchable part is long, the strength of the spirally wound tube itself is lowered, and it becomes difficult to fill the cement milk and insert the spirally wound tube into the existing tube. Furthermore, since the expansion / contraction part forms a recess in the inner circumferential surface of the spirally wound tube, the smoothness of the inner circumferential surface of the spirally wound tube is impaired.

Japanese Patent Laid-Open No. 7-40436 Japanese Patent Laid-Open No. 5-18478

  The present invention has been made to solve the above problems, and the object of the present invention is to maintain the smoothness of the inner peripheral surface of the spirally wound tube, and it does not break even when the wound tube expands or contracts. An object of the present invention is to provide a belt-like body that forms a spirally wound tube that can maintain water tightness and can maintain strength during injection of a filler, and a pipe rehabilitation method using the spirally wound tube.

  A strip for forming a spirally wound tube according to the present invention covers a strip material (1) provided with a stretchable part (5) having a slack (7) in the width direction, and a stretchable part (5) on the inner peripheral surface side. A flexible strip strip (2) and a strip (10) are provided, and the spirally wound tube (100) includes fitting portions (3) provided on both sides in the width direction of the strip (10). It is formed by fitting with each other.

  The cover strip material (2) is preferably a material that is more flexible than the strip material (1).

  It is preferable that the strip material (1) is made of a hard resin and the cover strip material (2) is made of a soft resin and integrally molded.

  The cover strip material (2) is preferably attached to the strip material (1) by fitting the large convexity into the large concave shape and the small convex shape into the small concave shape.

  A sealed space is preferably formed between the cover strip material (2) and the slack (7).

  The strip material (1) is preferably composed of a narrow strip material (1B) having a stretchable part (5) and a wide strip material (1A), which are fitted to each other.

  The pipe rehabilitation method using the spirally wound pipe according to the present invention includes a stage (A) in which water is stored at a predetermined depth in the bottom of the pipe (50) to be rehabilitated, and a fitting (20) with a strip ( 10) the strip material (1) having the stretchable part (5) and the cover strip material (2) are supplied so that the cover strip material (2) covers the stretchable part on the inner peripheral surface of the strip material (1). Step (B) to be attached to the guide roller (30), and both sides of the strip material (1) to which the cover strip material (2) is attached are fitted to each other and pushed forward while being rotated. A step (C) of forming a spirally wound tube (100) therein, and a step (D) of injecting a filler between the spirally wound tube (100) and the conduit (50). To do.

  The strip material (1) is composed of a wide strip material (1A) and a narrow strip material (1B) having a stretchable part (5). In step (C), the wide strip material (1A) and the narrow strip material ( It is preferable that two of 1B) are wound around the guide roller (30) and fitted to each other.

  In the pipe rehabilitation method using another spiral wound pipe according to the present invention, the strip material (1) having the stretchable part (5) and the cover strip material (2) are integrated in advance by two extruders and one die. The step (O) for forming, the step (P) for storing water at a predetermined depth at the bottom of the rehabilitated pipe (50), and the cover strip material (2) wound around the guide roller (30) A step (Q) of forming a spirally wound tube (100) in the pipe line (50) by fitting and rotating both sides of the strip material (1) to which the wire is attached, and rotating the spirally wound tube (100); And (R) injecting a filler between the pipe lines (50).

  According to the strip for forming a spirally wound tube of the present invention, since the strip material is provided with an expansion / contraction portion having a slack in the width direction, the strip material is coupled in a spiral shape. Alternatively, it can be strong against breaking or shrinking in the radial direction without breaking. Since the stretchable part of the inner surface of the spirally wound tube is covered with a flexible cover strip material, the smoothness of the inner peripheral surface of the tube can be maintained. Furthermore, even if the expansion / contraction part expands or contracts, the spiral wound tube does not break, so that water tightness can be maintained. Even if the cover strip material is broken in some cases, the stretchable part with slackness does not break, so that watertightness can be maintained. Even when the filler is injected between the spirally wound tube and the existing tube, the strength can be maintained.

  Since the cover strip material is made of a material that is more flexible than the strip material, the cover strip material can be expanded and contracted without a slack structure. The flatness of the inner peripheral surface can also be maintained.

  Since the strip material (1) is made of hard resin and the cover strip material (2) is integrally molded of soft resin, it is possible to save the trouble of fitting and assembling the strip material (1) and the cover strip material (2).

  The cover strip material is attached to the strip material by fitting the large convexity into the large concave shape and the small convex shape into the small concave shape. Therefore, when the spiral wound tube is pulled, The fitting part of the shape concave can be removed first.

  Since a sealed space is formed between the cover strip material and the slack, buoyancy can be imparted to the spirally wound tube when water is accumulated in the tube. Thereby, the propulsive force of the spirally wound tube is reduced, and the pushing operation is facilitated.

  Since the strip material is composed of the narrow strip material and the wide strip material, the material of the thick strip material and the narrow strip material can be separated. A narrow strip material having a stretchable portion can be formed of a flexible material.

  According to the pipe rehabilitation method using the spirally wound pipe of the present invention, the strip material (1) and the cover strip material (2) having the stretchable part (5) which is the belt-like body (10) in the fitting machine (20). Since the step (B) for supplying and attaching the cover strip material (2) so as to cover the stretchable portion of the inner peripheral surface of the strip material (1) is provided, the smoothness of the inner peripheral surface of the spirally wound tube can be maintained, Even if the winding tube expands or contracts, it does not break and can maintain watertightness, and a spiral winding tube that maintains strength when a filler is injected can be manufactured.

  In Step C, the narrow strip material and the wide strip material are wound around the guide roller and are fitted to each other to form a spiral wound tube, so that the spiral wound tube is made from one strip material. Not limited, a spiral wound tube can be manufactured by winding two strip materials.

  According to the pipe rehabilitation method using another spiral wound pipe of the present invention, the strip material (1) having the stretchable part (5) and the cover strip material (2) are formed by two extruders and one die. Since the step (O) for integrally molding is provided in advance, the strip material (1) and the cover strip material (2) which are the strips (10) are supplied to the fitting machine (20), and the cover strip material (2) It is possible to eliminate the step of attaching the cover so as to cover the stretchable portion of the inner peripheral surface of the strip material (1). In addition, the smoothness of the inner peripheral surface of the spirally wound tube can be maintained, and even if the wound tube is expanded or contracted, the watertightness can be maintained without breaking, and a spirally wound tube that maintains strength when the filler is injected can be manufactured.

It is sectional drawing of the width direction of the strip material by this invention. Example 1 It is a principal part enlarged view of FIG. It is sectional drawing of an adhesive type cover strip material. It is sectional drawing at the time of integrally forming a strip material and a cover strip material. (Example 2) It is principal part sectional drawing of the cover strip material which has the fitting unevenness | corrugation of a different size. It is sectional drawing which shows a fitting condition in case a strip material is comprised with a wide strip material and a narrow strip material. (Example 3) It is sectional drawing of the wide strip material of FIG. It is width direction sectional drawing of a narrow strip material and a cover strip material. It is explanatory drawing of the pipe renovation construction method by this invention. Example 1 It is explanatory drawing of the pipe renovation construction method by this invention. (Example 2) It is a flowchart of the pipe renovation method by this invention. (Examples 1 and 3) It is a flowchart of the pipe renovation method by this invention. (Example 2)

  Hereinafter, with reference to the drawings, a strip-shaped body for forming a spirally wound tube and a tube rehabilitation method using the spirally wound tube of the present invention will be described in detail.

  FIG. 1 is a cross-sectional view in the width direction of a strip material 1 according to the present invention. The strip 10 for forming the spirally wound tube 100 is a strip having a predetermined width and long in the length direction, and is composed of a strip material 1 and a cover strip material 2. As shown in FIG. 1, the strip material 1 includes a fitting part 3 on both the left and right sides, a plate-like part 4 on the inner side, and a central expansion / contraction part 5 as viewed in the cross section in the width direction. The plate-like portion 4 is provided with a plurality of ribs 8 extending in the length direction. The side of the rib 8 is opposed to the pipe line 50. One (left side) fitting part 3 is provided with two concave fitting parts 3a, and the other (right side) fitting part 3 is provided with two convex fitting parts 3b. The strip material 1 is wound spirally, and the spirally wound tube 100 is formed by fitting both the fitting portions 3 together. The cross-sectional shape of the spirally wound tube 100 can be an ellipse, a quadrangle, or the like other than a circle.

  The strip material 1 is extruded from the extruder into a mold. In this embodiment, the strip material 1 is made of vinyl chloride resin or polyethylene resin. The strip material 1 has a plate thickness of 1 to 6 mm, a width of 30 to 600 mm, and a length of 100 to 3000 m. The plate thickness of the stretchable portion 5 may be thinner than the peripheral portion. The length of expansion and contraction is set by predicting ground changes and earthquakes in advance. For example, if the expansion / contraction length is extended by 37 mm or more, it can cope with liquefaction due to an earthquake.

  FIG. 2 is an enlarged view of a main part of FIG. The expansion / contraction part 5 of the strip material 1 is provided with the slack 7 and extends in the width direction. However, when the spiral wound tube is used, it does not extend in the width direction but can expand and contract in the length direction. The inner peripheral surface of the stretchable part 5 of the strip material 1 is covered with the cover strip material 2. In this embodiment, the cover strip material 2 is attached to the expansion / contraction part 5 of the strip material 1 by fitting the medium shape protrusion 6a and the medium shape recess 6b. The cover strip material 2 is extruded and is the same material as the strip material 1 and is made of vinyl chloride resin or polyethylene resin. In this case, the thickness of the cover strip material 2 is made thinner than the plate thickness of the adjacent strip material 1. A soft resin such as soft vinyl chloride or low density polyethylene having an elongation of 10% to 500% can also be used. According to such a configuration, when the strip material 1 to which the cover strip material 2 is attached is pulled in the width direction, the stretchable portion 5 is reliably stretched. When a soft resin is used for the cover strip material 2, if the strip material 1 is stretched even a little, the cover strip material 2 is also stretched.

  FIG. 3 is a cross-sectional view of the adhesive-type cover strip material 2. As shown in FIG. 3, the cover strip material 2 can be attached to the strip material 1 by the adhesive 11 regardless of the fitting. Although not shown, if one side is bonded and the other side is fitted, when a tension of a certain value or more is applied, the fitting is removed and the bonded portion remains, and the cover strip material 2 does not fall off the strip material 1. You can

  FIG. 4 is a cross-sectional view when the strip material 1 and the cover strip material 2 are integrally formed. The extruding machine for forming the strip material 1 and the extruding machine for forming the cover strip material 2 are connected to one mold, and at the same time, the material is extruded into the mold. In this embodiment, the strip material 1 is a hard resin, and the cover strip material 2 is a soft resin. If the same resin, each can be firmly bonded by simultaneous molding. That is, in the case of vinyl chloride, hard vinyl chloride and soft vinyl chloride are used. In the case of polyethylene, a combination of high-density polyethylene and polyethylene elastomer or low-density polyethylene is used. As shown in FIG. 4, a sealed space 14 is formed between the strip material 1 and the cover strip material 2 and inside the slack 7.

  FIG. 5 is a cross-sectional view of the main part of the cover strip material 2 having fitting irregularities of different shapes. The large convex 6c is fitted into the large concave 6d, and the small convex 6e is fitted into the small concave 6f. In such a configuration, when a tension of a certain value or more is applied, the fitting of the small convex 6e and the small concave 6f is disengaged, and the fitting portion of the large convex 6c and the large concave 6d remains. The strip material 2 can be prevented from falling off the strip material 1. As shown by a dotted line in FIG. 4, in a state where the cover strip material 2 is fitted to the strip material 1, a sealed space 14 is formed between the slack 7 and the cover strip material 2. Since the sealed space 14 is constructed by accumulating water in the rehabilitating pipeline, buoyancy can be imparted to the spirally wound tube 100. The spiral winding tube 100 can be easily pushed into the tube.

  FIG. 6 is a cross-sectional view showing a fitting state when the strip material 1 is composed of a wide strip material 1A and a narrow strip material 1B. FIG. 7 is a cross-sectional view of the thick strip material 1A shown in FIG. FIG. 8 is a cross-sectional view in the width direction of the narrow strip material 1 </ b> B and the cover strip material 2. According to FIGS. 6-8, the raw material of the wide strip material 1A and the narrow strip material 1B can be divided. Convex fitting portions 3b are provided on both sides of the narrow strip material 1B, and are fitted to the concave fitting portions 3a of the wide strip material 1A. The large concave 6d and the small concave 6f of the narrow strip material 1B are fitted into the large convex 6c and the small convex 6e of the cover strip material 2, respectively.

  FIG. 9 is an explanatory diagram of the pipe rehabilitation method according to the present invention, and is a view showing a fitting former pushing state of the spirally wound pipe 100. The strip material 1 and the cover strip material 2 having the expansion / contraction part 5 are supplied to the fitting machine 20 installed in the manhole 51, and the cover strip material 2 is attached to the strip material 1. Thereafter, the strip material 1 is wound around the guide roller 30, and both sides of the strip material 1 are fitted to each other and pushed forward while rotating, thereby forming the spirally wound tube 100 in the pipeline 50 of the existing aged tube. In addition, water is poured into the bottom of the pipe 50 to be rehabilitated to a predetermined depth.

  FIG. 10 is an explanatory view of the pipe rehabilitation method according to the present invention, and the strip material 1 includes a thick strip material 1A and a narrow strip material 1B. The cover strip material 2 is attached to the narrow strip material 1B by the fitting machine 20. Then, the wide strip material 1A and the narrow strip material 1B are fitted to each other by the guide roller 30. The guide roller 50 winds two different strip members to make the spirally wound tube 100. When the spirally wound tube 100 is formed in the conduit 50, the cement milk filler 15 is injected into the gap between the spirally wound tube 100 and the conduit 50.

  FIG. 11 is a flowchart of the pipe rehabilitation method according to the present invention. Stage A is a stage in which water is stored at a predetermined depth at the bottom of the pipeline 50 to be rehabilitated. Stage B is a stage in which the strip material 1 and the cover strip material 2 are supplied to the fitting machine 20 at the construction site, and the cover strip material 2 is attached to the strip material 1. Stage C is a stage in which the strip material 1 is wound around the guide roller 30, and the both sides are fitted to each other and pushed forward while rotating to form the spirally wound pipe 100 in the pipe line 50. Stage D is a stage in which a filler, such as cement milk, is injected between the spirally wound tube 100 and the conduit 50. 9, only the strip material 1 is wound around the guide roller 30 in the case of FIG. 9, but in the case of FIG. 10, two of the wide strip material 1 </ b> A and the narrow strip material 1 </ b> B are wound around the guide roller 30. The

  FIG. 12 is a flowchart of the pipe rehabilitation method according to the present invention. Stage O is a stage in which the strip material 1 and the cover strip material 2 are integrally formed by two extruders and one die. Stage P is a stage in which water is stored at a predetermined depth at the bottom of the pipeline 50 to be rehabilitated. Stage Q is a stage in which the strip material 1 is wound around the guide roller 30, and both sides are fitted to each other and pushed forward while rotating to form the spirally wound tube 100 in the conduit 50. Stage R is a stage in which a filler, for example, cement milk is injected between the spirally wound tube 100 and the conduit 50.

  It is suitable as a belt-like body for forming an expandable / contractible spiral wound pipe that can rehabilitate a sewer pipe or agricultural water pipe.

DESCRIPTION OF SYMBOLS 1 Strip material 1A Thick width strip material 1B Narrow width strip material 2 Cover strip material 3 Fitting part 3a Concave fitting part 3b Convex fitting part 4 Plate part 5 Stretching part 6 Locking part 6a Medium shape convex 6b Medium shape concave 6c Large convex 6d Large concave 6e Small convex 6f Small concave 7 Slack 8 Rib 9 Packing 10 Strip 11 Adhesive 12 Adhesive feed hose 13 Hydraulic hose 14 Sealed space 15 Filler (cement milk)
20 Fitting Machine 21 Strip Material Feeding Roller 30 Guide Roller 50 Pipe 51 Manhole 100 Spiral Winding Tubes A to D Method Stages O to R Method Stages

Claims (9)

A strip material (1) provided with a stretchable part (5) having a slack (7) in the width direction;
A flexible strip strip (2) covering the stretchable portion (5) on the inner peripheral surface side and a strip (10) are provided, and the spirally wound tube (100) is the width of the strip (10). A strip-shaped body for forming a spirally wound tube, which is formed by fitting fitting portions (3) provided on both sides in the direction.
The strip for forming a spirally wound tube according to claim 1, wherein the cover strip material (2) is a material that is more flexible than the strip material (1).
The strip for forming a spirally wound tube according to claim 1, wherein the strip material (1) is made of a hard resin and the cover strip material (2) is made of a soft resin and is integrally formed.
The cover strip material (2) is attached to the strip material (1) by fitting a large convexity into a large concave shape and a small convex shape into a small concave shape. A strip for spiral wound tube formation.
The band for forming a spirally wound tube according to claim 1, wherein a sealed space is formed between the cover strip material (2) and the slack (7).
The spiral according to claim 1, characterized in that the strip material (1) is composed of a narrow strip material (1B) having a stretchable part (5) and a wide strip material (1A), and is fitted to each other. A strip for forming a wound tube.
Storing water at a predetermined depth in the bottom of the rehabilitated pipe (50) (A);
The mating machine (20) is supplied with the strip material (1) having the stretchable part (5) and the cover strip material (2), and the cover strip material (2) is attached to the inner peripheral surface of the strip material (1). A stage (B) of mounting so as to cover the stretchable part,
It is wound around the guide roller (30), and both sides of the strip material (1) to which the cover strip material (2) is attached are fitted to each other and pushed forward while rotating, and the spirally wound tube (100) is inserted into the pipe line (50). Forming (C),
And (D) a step of injecting a filler between the spirally wound tube (100) and the conduit (50).
The strip material (1) is composed of a wide strip material (1A) and a narrow strip material (1B) having a stretchable part (5). In step (C), the wide strip material (1A) and the narrow strip material ( The pipe rehabilitation method using a spirally wound pipe according to claim 7, wherein two of 1B) are wound around a guide roller (30) and fitted to each other.
A step (O) in which the strip material (1) having the stretchable part (5) and the cover strip material (2) are integrally formed in advance by two extruders and one mold;
Storing water at a predetermined depth in the bottom of the rehabilitated pipe (50) (P);
It is wound around the guide roller (30), and both sides of the strip material (1) to which the cover strip material (2) is attached are fitted to each other and pushed forward while rotating, and the spirally wound tube (100) is inserted into the pipe line (50). Forming step (Q);
A pipe rehabilitation method using a spirally wound tube, comprising: a step (R) of injecting a filler between the spirally wound tube (100) and the conduit (50).

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