JP2018052015A - Belt-like member for forming spiral tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt-like member for forming a spiral tube, which is capable of forming an inner surface of the spiral tube smooth at all times regardless of deformation amount of a flexible part.SOLUTION: A belt-like member 2 forms a spiral tube by being wound in a spiral form to be formed into a tubular shape. A main body 21 has a flexible part 214 formed by being bent to be projected toward a back face side. A stretchable sheet 22 exhibits elasticity and is laminated to cover the flexible part 214 on an inner face side of the main body 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a strip-shaped member for forming a spiral tube used when rehabilitating an aged existing tube.

  Metal pipes and fume pipes have long been used for existing pipes used as waterworks and sewers. 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.

  As one of existing pipe lining methods, a method of lining an existing pipe with a spiral pipe formed by spirally winding a strip member made of synthetic resin is known. In this method, a spiral tube is manufactured by winding a strip-shaped member for existing pipe lining in a spiral shape, and bringing adjacent side edges of the spirally wound strip-shaped member into an engaged state. By inserting the formed helical tube into the existing tube, the inner surface of the existing tube is lined by the helical tube.

  Some of the belt-shaped members are provided with mountain-shaped expansion / contraction portions so that the formed helical tube can be easily extended in the axial direction (Patent Documents 1 and 2). By providing the belt-shaped member with the expansion and contraction portion in this way, it absorbs external forces during an earthquake to prevent the spiral tube from being damaged, or absorbs a large tensile force acting in the width direction of the belt-shaped member at the curved portion of the existing tube. It becomes possible to do.

  When the belt-like member provided with the expansion / contraction part is manufactured into the spiral tube, the expansion / contraction part forms a spiral groove on the inner surface of the spiral tube, thereby generating irregularities. Such a groove serves as a starting point for clogging of dust or deteriorates the roughness of the inner surface of the spiral tube.

  In patent document 1, the structure extended | stretched so that the side edge part of a strip | belt-shaped member may reach the expansion-contraction part of an adjacent strip | belt-shaped member is disclosed. In this configuration, during normal times (when there is no significant deformation in the stretchable part), the groove part is hidden by the adjacent belt-like member, and the groove part can be prevented from being exposed on the inner surface of the spiral tube.

  Further, Patent Document 2 discloses a configuration in which an elastic body is disposed in a compressed state in the expansion / contraction part, and the surface of the belt-like member and the surface of the elastic body are positioned in the same plane. In this configuration, the force applied in the width direction of the belt-shaped member in the helical tube is absorbed by the expansion / contraction part, and the elastic body expands and contracts in a state where it is located in the same plane as the inner surface of the helical tube.

Japanese Patent Laid-Open No. 11-034165 JP-A-6-143420

  In the structure in the above-mentioned Patent Document 1 or 2, it is possible to alleviate the unevenness due to the groove at a location where the deformation of the expansion / contraction portion is small, such as the straight tube portion of the spiral tube. However, such a helical tube is not necessarily formed only by a straight tube portion, and a curved portion is also present in the helical tube. In the case of manufacturing a spiral tube that is curved by a belt-like member provided with an expansion / contraction part, the deformation amount (extension width) of the expansion / contraction part increases on the outer peripheral side of the bending part, and the groove part also opens widely.

  In the structure of Patent Document 1, there is a problem that at the portion where the groove portion is largely opened at a curved portion or the like, the opened groove portion cannot be completely hidden, and the groove portion is exposed on the inner surface of the spiral tube to cause unevenness. Further, the structure of Patent Document 2 has a problem that the elastic body arranged in the expansion / contraction part is deformed so as to be greatly depressed, and irregularities are generated between the inner surface of the spiral tube and the elastic body surface. Alternatively, the elastic body cannot follow the deformation of the stretchable part, and there is a possibility that peeling occurs at the interface between the stretchable part and the elastic body.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a strip-shaped member for forming a spiral tube that can always smooth the inner surface of the spiral tube regardless of the deformation amount of the stretchable portion.

  In order to solve the above-described problem, a spiral tube forming strip member of the present invention is a spiral tube forming strip member that is wound spirally to form a spiral tube, and serves as an inner surface of the spiral tube. When the side is the inner surface of the spiral tube forming strip member and the side that is the outer surface of the spiral tube is the back surface of the spiral tube forming strip member, the expansion and contraction formed by bending so as to protrude toward the back side A belt-like member main body having a portion, and a stretched sheet that has stretchability and is laminated and disposed so as to cover the stretchable portion on the inner surface side of the belt-like member main body.

  According to the above configuration, when the spiral tube forming belt-shaped member is wound to form the spiral tube, if the stretchable portion is opened by applying a tensile force in the width direction to the belt-shaped member main body, the stretchable portion is covered. Along with this, the stretched sheet also extends in the width direction. Thereby, the groove part by an expansion-contraction part is not exposed in the inner surface of a spiral tube, and the inner surface of a spiral tube is kept smooth by an extending | stretching sheet. In other words, it is possible to prevent the clogging of the grooves existing on the inner surface of the spiral tube and the decrease in the roughness of the inner surface of the spiral tube due to the unevenness.

  Further, in the above-mentioned spiral tube forming strip-shaped member, the stretched sheet is bonded and fixed to the strip-shaped member main body on both sides of the stretchable portion, and a non-bonding region that does not adhere around the stretchable portion is provided. It can be set as the structure currently provided.

  According to said structure, by providing a non-adhesion area | region around the expansion-contraction part, the stretch margin of the stretched sheet when an expansion-contraction part opens can be ensured.

  Moreover, in the said strip | belt-shaped member for spiral tube formation, it can be set as the structure by which the flexible bag cylinder-shaped hollow member is arrange | positioned inside the said expansion-contraction part.

  According to the above configuration, for example, by filling the hollow member with the filling material after the helical tube is manufactured and curing the filling material, not only the stretched sheet but also the filling material of the helical tube The inner surface can be kept smooth.

  When the belt-shaped member for forming a spiral tube of the present invention is subjected to a tensile force in the width direction on the belt-shaped member main body and the stretchable part is opened, the stretched sheet covering the stretchable part extends in the width direction along with this, The inner surface of the spiral tube is kept smooth by the stretched sheet. Thereby, the groove part by an expansion / contraction part is not exposed on the inner surface of the spiral tube, and the groove part existing on the inner surface of the spiral tube is clogged with dust, or the roughness of the inner surface of the spiral tube is lowered by the unevenness. There is an effect that can be prevented.

It is explanatory drawing which shows an example of the rehabilitation method of the existing pipe | tube in embodiment of this invention. It is sectional drawing of the strip | belt-shaped member shown in Embodiment 1, (a) is a figure which shows the state by which the expansion-contraction part is not expand | extended, (b) is a figure which shows the state by which the expansion-contraction part was expand | extended. It is a figure which shows the adhesion | attachment / non-adhesion area | region of an extending | stretching sheet and a main-body part in the strip | belt-shaped member of FIG. 2, (a) is a figure which shows the state which the expansion-contraction part is not expand | extended, (b) is the expansion-contraction part extended | stretched. It is a figure which shows a state. It is sectional drawing of the strip | belt-shaped member shown in Embodiment 2, (a) is a figure which shows the state by which the expansion-contraction part is not expand | extended, (b) is a figure which shows the state by which the expansion-contraction part was expand | extended.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Rehabilitation of the existing pipe is performed by forming a tubular rehabilitation pipe in the existing pipe and lining the inner surface of the old existing pipe with the new rehabilitation pipe. As the rehabilitation pipe, a spiral pipe formed by spirally winding a band-like member is used.

  FIG. 1 is an explanatory view showing an example of an existing pipe rehabilitation method. As shown in FIG. 1, a drum 30 around which a belt-shaped member (spiral tube forming belt-shaped member) 2 is wound is installed in the upper manhole 11 of the existing tube 10 or in the existing tube 10. The drum 30 is used to continuously supply the belt-like member 2 to a self-propelled pipe making machine 40 disposed in the existing pipe 10. The pipe making machine 40 forms the rehabilitation pipe (helical pipe) 20 by winding the belt-like member 2 in a spiral shape and forming it into a tubular shape.

  2A and 2B are cross-sectional views showing examples of the shape of the band-like member 2 in the first embodiment (note that hatching in the cross-sectional views is omitted in the drawings referred to in the embodiment). ing.). The band-shaped member 2 is a long band-shaped member, and is composed of a main body portion (band-shaped member main body) 21 formed of a synthetic resin and a stretched sheet 22. In the following description, when the band-shaped member 2 is wound to form a spiral tube, the side that becomes the inner surface of the spiral tube is the inner surface of the band-shaped member 2, and the side that is the outer surface of the spiral tube is the band-shaped member 2. And the back.

  The main body portion 21 is provided with a first fitting portion 212 at one end portion in the width direction with respect to the flat plate portion 211 that is the inner surface of the spiral tube when the main body portion 21 is manufactured into the spiral tube. The 2nd fitting part 213 is provided in this. The first fitting portion 212 and the second fitting portion 213 are each formed along the longitudinal direction of the main body portion 21 and have a shape that can be fitted together and joined. However, the specific shapes of the first fitting portion 212 and the second fitting portion 213 are not particularly limited in the present invention.

  Further, the main body 21 is provided with an expansion / contraction portion 214 bent in a mountain shape so as to protrude to the back side in the middle of the flat plate portion 211. The stretchable part 214 is provided so that the belt-like member 2 can extend in the width direction. The cross-sectional shape of the expansion / contraction part 214 is not limited to the substantially U shape shown in FIG. 2, and may be a shape bent into a substantially triangular shape or a substantially rectangular shape, for example. Moreover, the number of the expansion / contraction parts 214 is not limited to two shown by FIG. 2, The at least one expansion / contraction part 214 should just be formed.

  A plurality of reinforcing ribs 215 having a T-shaped cross section are also provided on the back side of the main body 21. The reinforcing rib 215 includes a column portion 215A and a flange portion 215B. The column portion 215A is formed so as to protrude from the flat plate portion 211 to the back side, and the flange portion 215B is provided at the tip of the column portion 215A in a state orthogonal to the column portion 215A. Each reinforcing rib 215 is formed such that each flange portion 215 </ b> B is located in the same plane substantially parallel to the flat plate portion 211.

  The stretched sheet 22 is made of a resin material having high stretchability, and is continuously disposed along the longitudinal direction of the main body portion 21 so as to be laminated with the flat plate portion 211 on the inner surface side of the main body portion 21. In addition, the stretched sheet 22 is disposed so as to cover at least the stretchable part 214, and is fixed to the flat plate part 211 by adhesion or the like on both sides of the stretchable part 214.

  When the belt-like member 2 is wound to form a helical tube, if the expansion / contraction part 214 is opened by applying a tensile force in the width direction to the main body part 21 (see FIG. 2B), the expansion / contraction part 214 is covered. Along with this, the stretched sheet 22 also extends in the width direction. Thereby, the groove part by the expansion / contraction part 214 is not exposed on the inner surface of the spiral tube, and the inner surface of the spiral tube is kept smooth by the stretched sheet 22. That is, in the spiral tube formed by using the band-like member 2 according to the first embodiment, the clogged portion of the groove on the inner surface is clogged with dust, or the roughness of the inner surface of the spiral tube is reduced due to unevenness. Can be prevented.

  As described above, the stretched sheet 22 is fixed to the flat plate portion 211 by adhesion on both sides of the stretchable portion 214. However, the stretched sheet 22 is not adhered to the entire surface of the stretchable sheet 22, but stretched as shown in FIG. It is preferable to provide a non-adhesion region where no adhesion is performed around the portion 214. By providing the non-adhesion region in this way, it is possible to secure the stretch margin of the stretched sheet 22 when the stretchable portion 214 is opened.

  Here, the length L1 in the width direction of the non-bonded region of the stretched sheet 22 in the default state where the tensile force in the width direction is not applied to the main body portion 21 of the band-shaped member 2 is as follows. It sets so that Formula (1) may be satisfy | filled. In Equation (1), L2 is the amount of extension when the stretchable part 214 is opened to the allowable limit (see FIG. 3B), and α is the maximum allowable stretch rate in the width direction of the stretched sheet 22.

(L1 + L2) / L1 <α (1)
The material of the stretched sheet 22 is not particularly limited, but it is preferable that the stretched sheet 22 has a high stretchability so that the stretchable portion 214 can be deformed following the opening. Moreover, when using the strip | belt-shaped member 2 which concerns on this Embodiment for the rehabilitation of the existing pipe used as a sewer, the material of the extending | stretching sheet 22 may have water resistance, abrasion resistance, gas resistance, etc. Required. Examples of the material of the stretched sheet 22 include polyethylene and polyvinyl chloride.

[Embodiment 2]
In the first embodiment, the stretched sheet 22 is laminated and disposed so as to cover the stretchable part 214 on the inner surface side of the main body part 21, but the inside of the stretchable part 214 is a space. On the other hand, the second embodiment is characterized in that a filling material is filled inside the stretchable part 214 and the smoothness of the inner surface of the spiral tube is secured by the filling material.

  For example, in the belt-like member 2 shown in FIGS. 2A and 2B, a fluid-like filling material is filled using a space surrounded by the stretchable portion 214 and the stretched sheet 22 as a flow path, and the filling material is filled after filling. It is conceivable to cure. In this case, the filling of the filling material is performed after the spiral tube is formed by the belt-shaped member 2. That is, when expansion deformation occurs in the expansion / contraction part 214 at the time of pipe making, the filling material is filled after the deformation, and the expansion / contraction part 214 is not greatly deformed after filling the filling material.

  In the above configuration, after the filling material filled inside the stretchable portion 214 is cured, not only the stretched sheet 22 but also the inner surface of the spiral tube is maintained smoothly by the filling material. For this reason, the stretched sheet 22 only needs to maintain the smooth inner surface of the spiral tube until at least the filling material is cured, and the stretched sheet 22 does not require long-term durability as compared with the case where the filling material is not filled. It will end. That is, the range of materials that can be used as the stretched sheet 22 is widened, and as a result, the cost of the stretched sheet 22 may be reduced.

  4 (a) and 4 (b) are cross-sectional views showing a modification of the belt-like member 2 in the second embodiment. The band-shaped member 2 shown in FIGS. 4 (a) and 4 (b) is substantially similar in configuration to the band-shaped member 2 shown in FIGS. 2 (a) and 2 (b), but the hollow member 23 is disposed inside the stretchable part 214. Only the differences are different. The hollow member 23 is a flexible bag-shaped member, and is continuously disposed along the longitudinal direction of the main body 21.

  In this configuration, the hollow member 23 is disposed inside the stretchable portion 214 in a recessed state in the default state (see FIG. 4A), but when the filling material is filled therein, the hollow member 23 is It will be in a swelled state (see FIG. 4B). Even in the above configuration, after the filling material filled in the hollow member 23 is cured, not only the stretched sheet 22 but also the inner surface of the spiral tube is maintained smooth by the filling material.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

2 Strip member (Strip member for spiral tube formation)
10 Existing pipe 20 Rehabilitation pipe (spiral pipe)
21 Main body (band-shaped member main body)
22 Stretched sheet 23 Hollow member 211 Flat plate part 212 First fitting part 213 Second fitting part 214 Stretching part 215 Reinforcing rib

Claims (3)

A spiral tube-forming band-shaped member that is spirally wound to form a spiral tube,
When the side that becomes the inner surface of the spiral tube is the inner surface of the strip-shaped member for forming the spiral tube and the side that becomes the outer surface of the spiral tube is the back surface of the strip-shaped member for forming the spiral tube, A band-shaped member main body having a stretchable portion formed by bending to
A belt-shaped member for forming a helical tube, comprising a stretchable sheet having stretchability and being laminated and disposed so as to cover the stretchable part on the inner surface side of the belt-shaped member main body. It is a strip | belt-shaped member for spiral tube formation of Claim 1, Comprising:
Helical tube formation characterized in that the stretched sheet is bonded and fixed to the belt-like member main body on both sides of the stretchable part, and is provided with a non-adhesive region that does not adhere around the stretchable part. Band-shaped member. It is a strip | belt-shaped member for spiral tube formation of Claim 1 or 2, Comprising:
A spiral tube-forming belt-shaped member, wherein a flexible bag-cylinder-shaped hollow member is disposed inside the stretchable portion.

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