JP2013082095A - Existing pipe rehabilitation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an existing pipe rehabilitation member having a flexible function and superior chemical resistance.SOLUTION: The existing pipe rehabilitation member is helically wound along an inner surface of an existing pipe, or is installed in the existing pipe in a longitudinal direction. The existing pipe rehabilitation member is configured to form an inner pipe in the existing pipe by being fit into the side edge of neighboring existing pipe rehabilitation member in a width direction, and to include a flexible part comprising a polyolefin resin.

Description

  The present invention relates to a strip-shaped existing pipe rehabilitation member for rehabilitating or protecting an existing pipe by being installed along the inner surface of the existing pipe, and in particular, includes a stretchable part capable of extending and / or contracting in the width direction. In addition, the present invention relates to an existing pipe rehabilitation member having excellent chemical resistance.

  As a method of rehabilitating existing pipes such as sewers whose functions have deteriorated due to aging, cracks due to environmental changes, internal corrosion, wear, etc., without re-digging the road, the non-open-cut pipe rehabilitation method is known.

  The non-open-cut pipe rehabilitation method is a method in which a strip-shaped existing pipe rehabilitation member made of hard vinyl chloride resin is fitted to the side edge in the width direction of an adjacent existing pipe rehabilitation member along the inner surface of the existing pipe. It is a method of rehabilitating existing pipes by winding them in a spiral shape. In such a construction method, when there is a bend or a step in the existing pipe, when a non-circular existing pipe is rehabilitated, or as a countermeasure against an earthquake, a method of giving the existing pipe rehabilitation member an expansion / contraction function has been developed. (For example, refer to Patent Documents 1 and 2).

JP 2004-251340 A (published on September 9, 2004) Japanese Patent Laying-Open No. 2006-29561 (released February 2, 2006)

  However, the existing pipe rehabilitation member having the expansion / contraction function has a problem that the chemical resistance of the part exhibiting the expansion / contraction function is not sufficient as compared with other parts of the existing pipe rehabilitation member.

  Specifically, Patent Document 1 discloses a method in which a strip-shaped strip is wound along the inner surface of an existing pipe in a spiral shape while fitting the side edges in the width direction using a joiner. A technique is disclosed in which when the pitch of the strip-like strip is widened due to an earthquake or the like, even if the joiner breaks, it can be water-tightly sealed by the stretchable part. Such a stretchable part uses a soft synthetic resin or an elastomer as its material, but has a problem that its chemical resistance is not sufficient as compared with a part made of Joiner's hard vinyl chloride resin.

  Further, in Patent Document 2, in order to rehabilitate a non-circular existing pipe such as a rectangle, the strip is attached to the inner surface of the existing pipe with an anchor, and the length direction of the strip is connected with a connecting member. A technique is disclosed in which a stretchable variable joiner is disposed at a corner and the width direction of the strip is joined by the joiner and the stretchable variable joiner. The expansion / contraction variable part of the expansion / contraction variable joiner also has the same problems as the expansion / contraction part because soft synthetic resin or elastomer is used as the material thereof.

  This invention is made | formed in view of the said problem, The objective is to implement | achieve the existing pipe renovation member which was excellent in chemical resistance while having an expansion-contraction function.

An existing pipe rehabilitation member according to the present invention is a strip-like existing pipe rehabilitation member for rehabilitating or protecting an existing pipe in order to solve the above-mentioned problem, along the inner surface of the existing pipe,
(A) spirally wound, or
(B) installed in the longitudinal direction of the existing pipe,
In addition, the inner pipe is formed inside the existing pipe by fitting with the side edge in the width direction of the adjacent existing pipe renewal member. And a stretchable portion capable of extending and / or shrinking in the width direction, the stretchable portion is made of a polyolefin resin, and the belt-like portion is made of a hard vinyl chloride resin. It is a feature.

  According to the said structure, the chemical resistance of an expansion-contraction part can be improved by using polyolefin resin for an expansion-contraction part. Therefore, there is an effect that it is possible to realize an existing pipe rehabilitation member having an expansion / contraction function and excellent chemical resistance.

  In the existing pipe rehabilitation member according to the present invention, it is preferable that the polyolefin resin constituting the stretchable part includes a polyolefin resin that is not polar-modified and a polyolefin resin that is polar-modified.

  The polyolefin resin constituting the stretchable part includes a polyolefin resin that is not polar-modified and a polyolefin resin that is polar-modified, so that the stretchable part composed of the polyolefin resin and the hard vinyl chloride resin There is an additional effect that the belt-shaped portion configured can be firmly bonded.

  In the existing pipe rehabilitation member according to the present invention, the proportion of the polyolefin resin that is polar-modified in the polyolefin resin that constitutes the stretchable part is 100 parts by weight of the polyolefin resin that is not polar-modified contained in the stretchable part. The amount is more preferably 50 parts by weight or less.

  The proportion of the polar-modified polyolefin resin in the polyolefin resin constituting the stretchable part is 50 parts by weight or less with respect to 100 parts by weight of the polyolefin resin not polar-modified contained in the stretchable part. In addition, it is possible to ensure better adhesion between the stretchable part made of polyolefin resin and the belt-like part made of hard vinyl chloride resin, and reduce the proportion of the polyolefin resin that has been polar-modified. Further, there is an additional effect that the characteristics of the target polyolefin resin can be maintained.

  In the existing pipe rehabilitation member according to the present invention, the polar-modified polyolefin resin is a maleic anhydride-modified polyolefin having a polar group introduced by graft copolymerization of maleic anhydride, or (meth) acrylic acid 4-t. -A polyolefin resin graft-modified with a vinyl monomer containing a butylcyclohexyl monomer and a phosphate group-containing vinyl monomer is preferable.

  Maleic anhydride-modified polyolefin introduced with polar groups by graft copolymerization of maleic anhydride with the polar-modified polyolefin resin, or (meth) acrylic acid 4-tert-butylcyclohexyl monomer and phosphoric acid group-containing A polyolefin resin graft-modified with a vinyl monomer including a vinyl monomer, so that the stretchable part made of polyolefin resin and the band-like part made of hard vinyl chloride resin are firmly bonded. There is a further effect of being able to.

  In the existing pipe rehabilitation member according to the present invention, the polyolefin resin preferably contains a metallocene polyethylene.

  When the polyolefin resin contains a metallocene polyethylene, the low and low molecular weight component of the stretchable part, impact resistance, ESCR resistance, transparency, low temperature sealability, blocking resistance, low odor resistance, solvent extraction resistance, etc. There is a further effect that it can be improved. Further, when rehabilitating an existing pipe having a bend or a step, it is necessary to greatly expand and contract the expansion / contraction part, and there is also an effect that the rigidity of the expansion / contraction part is reduced and construction is easily performed.

  In the existing pipe rehabilitation member according to the present invention, the ratio of the metallocene polyethylene in the polyolefin resin is 10 to 30% by weight with respect to the whole polyolefin resin not subjected to polar modification contained in the polyolefin resin. It is preferable.

  The ratio of the metallocene polyethylene in the polyolefin resin is 10 to 30% by weight with respect to the whole polyolefin resin that is not polar-modified contained in the polyolefin resin, whereby the tensile yield stress of the stretchable part, There is an additional effect that the tensile elongation at break and the tensile elastic modulus are excellent.

  In the existing pipe rehabilitation member according to the present invention, it is preferable that the polyolefin resin constituting the stretchable part is joined to the band-like part through an adhesive layer containing a thermoplastic polyurethane-based adhesive.

  The polyolefin resin constituting the stretchable part is joined to the band-like part via an adhesive layer containing an adhesive based on a thermoplastic polyurethane, so that the stretchable part constituted by the polyolefin resin and hard vinyl chloride There is a further effect that it is possible to firmly join the belt-shaped portion made of the resin.

  In the existing pipe rehabilitation member according to the present invention, it is preferable that the belt-shaped portion has a protrusion, and the polyolefin resin constituting the stretchable portion is joined to the belt-shaped portion and the protrusion.

  The band-shaped part has a protruding part, and the polyolefin-based resin constituting the stretchable part is bonded to the band-shaped part and the protruding part, thereby increasing the bonding area between the band-shaped part and the adhesive layer. Can do. Therefore, there is an additional effect that the stretchable portion made of the polyolefin resin and the belt-like portion made of the hard vinyl chloride resin can be joined more firmly.

As described above, the existing pipe rehabilitation member according to the present invention is a strip-shaped existing pipe rehabilitation member for rehabilitating or protecting the existing pipe, along the inner surface of the existing pipe,
(A) spirally wound, or
(B) installed in the longitudinal direction of the existing pipe,
In addition, the inner pipe is formed inside the existing pipe by fitting with the side edge in the width direction of the adjacent existing pipe renewal member. And a stretchable portion capable of extending and / or shrinking in the width direction, the stretchable portion is made of a polyolefin-based resin, and the band-shaped portion is made of a hard vinyl chloride resin, By using a polyolefin-based resin for the stretchable part, the chemical resistance of the stretchable part can be improved. Therefore, there is an effect that it is possible to realize an existing pipe rehabilitation member having an expansion / contraction function and excellent chemical resistance.

It is sectional drawing which shows the schematic structure of the joiner which is the existing pipe renovation member which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the use condition of the joiner which is the existing pipe renovation member which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the state which formed the inner pipe | tube in the inner surface of the existing pipe using the joiner which is the existing pipe renovation member which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the state which the bending part of the Joiner which is the existing pipe renovation member which concerns on the 1st Embodiment of this invention fractured | ruptured, and the expansion-contraction part expanded. It is sectional drawing which shows the other structure of the joiner which is the existing pipe renovation member which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the outline of the joiner which is the existing pipe renovation member which concerns on the 2nd Embodiment of this invention. Sectional drawing which removed the center part of the joiner which is the existing pipe renovation member which concerns on the 2nd Embodiment of this invention, or the schematic structure of the joiner which is the existing pipe renovation member which concerns on the 3rd Embodiment of this invention It is sectional drawing shown. It is sectional drawing which shows the schematic structure of the joiner which is the existing pipe renovation member which concerns on the 4th Embodiment of this invention. In an Example, it is a figure which shows the sample piece used for the tension test, (a) is sectional drawing of a sample piece, (b) is a side view of a sample piece.

  Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to this, and can be implemented in a mode in which various modifications are made within the described range. Moreover, all the patent documents described in this specification are used as reference in this specification. Unless otherwise specified in this specification, “A to B” indicating a numerical range means “A or more and B or less”.

[First Embodiment]
1st Embodiment of the existing pipe renovation member concerning this invention is described based on FIGS. FIG. 1 is a cross-sectional view showing a schematic configuration of a joiner which is an existing pipe rehabilitation member according to the present embodiment. FIG. 2 is a cross-sectional view showing a use state of a joiner which is an existing pipe rehabilitation member according to the present embodiment. FIG. 3 is a cross-sectional view showing a state in which the inner pipe is formed on the inner surface of the existing pipe using the joiner that is the existing pipe rehabilitation member according to the present embodiment. FIG. 4 is a cross-sectional view showing a state in which the bending portion of the joiner that is the existing pipe rehabilitation member according to the present embodiment is broken and the expansion and contraction portion is expanded. FIG. 5 is a cross-sectional view showing another configuration of a joiner that is an existing pipe rehabilitation member according to the present embodiment.

  The joiner 80 according to the present embodiment shown in FIGS. 1 and 2 is provided along the inner surface of the existing pipe 12 in order to rehabilitate the existing pipe 12 such as an old sewage pipe or to protect the inner surface of the existing pipe 12. The adjacent strips 14 in the width direction are joined together to form the inner tube 16. In the present embodiment, the existing pipe 12 is a fume pipe. Of course, the present invention can also be applied to existing pipes 12 made of synthetic resin or metal other than the fume pipe. The strip 14 is continuously formed by extrusion molding of a synthetic resin such as a hard vinyl chloride resin, and includes a strip-shaped main body 18. A leg portion 20 having a substantially T-shaped cross section that abuts the inner surface of the existing pipe 12 is formed on one main surface of the main body 18, and grooves 22, 22 are formed on both side edges in the width direction of the main body 18. Yes. Each groove 22 is formed by a first wall 24 close to the main body 18 and a second wall 26 far from the main body 18, and the inner surface and the outer surface of the second wall 26 have a substantially claw-shaped cross section as shown in FIG. Engaging portions 28, 28, 29, and 29 are formed. Further, a leg portion 30 having a substantially U-shaped cross section that abuts against the inner surface of the existing pipe 12 is formed at the bottom of each groove 22. The leg portion 20, the groove 22, the first wall 24, the second wall 26, the engaging portions 28 and 29, and the leg portion 30 are formed along the entire length of the main body 18.

  The joiner 80 includes a band-shaped portion 32 that constitutes a band-shaped main body formed continuously by extrusion molding of a hard synthetic resin such as a hard vinyl chloride resin. The belt-like portion 32 has a flat surface 32a that faces the inside of the formed inner tube when the inner tube is formed by being spirally wound. At both ends in the width direction of the belt-like portion 32, a protrusion 34 fitted into the groove 22 of the belt-like strip 14 and a sandwiching portion 36 are formed outside the inner tube when wound spirally. It protrudes from the other surface which faces, and the sealing material 23 is mounted | worn between these. The ridge 34 that is closer to the widthwise end of the belt-like portion 32 and the clamping portion 36 that is closer to the center than the ridge 34 cooperate with each other to pinch the second wall 26 of the belt-like strip 14. The sandwiching portion 36 has a cross-sectional shape whose tip is bent in a U-shape toward the center in the width direction of the strip-shaped portion 32, and is formed on the outer surface of the second wall 26 on the end-side surface of the strip-shaped portion. An engaging portion 39 having a substantially claw-shaped cross section that is engaged with the engaging portion 29 is formed. The protrusion 34 is formed with an engaging portion 38 having a substantially claw-shaped cross section that engages with an engaging portion 28 formed on the inner surface of the second wall 26. The protrusions 34, the sandwiching portions 36, and the engaging portions 38 and 39 are continuously formed along the longitudinal direction of the band-shaped portion 32. Further, the other surface of the band-shaped part 32 is formed with a stretchable part 40 in a band shape along the longitudinal direction of the band-shaped part 32.

  The strip portion 32 is made of a hard vinyl chloride resin. In addition, being comprised with hard vinyl chloride resin means that the strip | belt-shaped part 32 contains hard vinyl chloride resin as a main component. Therefore, other resins may be included as long as the effects of the present invention are not affected. In the present specification, “included as a main component” means that it is 90 parts by weight or more, more preferably 95 parts by weight or more.

  The stretchable part 40 is made of a polyolefin-based resin, and as shown in FIGS. 1 and 2, the side edges 40a, 40a in the width direction are spaced apart from each other along the longitudinal direction of the band-like part 32 of the joiner 80. And is fixed to the other surface of the belt-like portion 32.

  In addition, being comprised with polyolefin resin means that the expansion-contraction part 40 contains polyolefin resin as a main component. Therefore, other resins may be included as long as the effects of the present invention are not affected. Conventionally, a soft synthetic resin or an elastomer has been used as an expansion / contraction part to give an expansion / contraction function to the existing pipe rehabilitation member, but from the viewpoint of chemical resistance, it is compared with a belt-shaped part composed of a hard vinyl chloride resin. It wasn't enough. With the use of polyolefin resin as the material that constitutes the expansion / contraction part 40, it has an expansion / contraction function when there is a bend or step in the existing pipe, when rehabilitating a non-circular existing pipe, or as a measure against earthquakes. Moreover, the existing pipe rehabilitation member excellent in chemical resistance can be realized.

  The polyolefin-based resin is not particularly limited as long as it is a resin that contains an olefin component such as ethylene, propylene, and butene as a main monomer component as a monomer unit. Here, “include as a main monomer component” means that the content is preferably 50 mol% or more, and more preferably 70 mol% or more when the total monomer components are 100 mol%. The olefin component may be a single olefin or a combination of two or more.

  Examples of the polyolefin resin include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, polybutene, polyisobutylene, poly-4-methylpentene-1 resin, olefin thermoplastic elastomer ( And polyolefin resins such as (TPO) (an elastomer composition composed of ethylene / α-olefin copolymer rubber / polypropylene). These polyolefin resins may be used alone or in combination of two or more. Further, the polyolefin resin includes an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, and the like.

  Examples of the polyethylene include linear low density polyethylene resin (LLDPE), low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), and high density polyethylene resin (HDPE). These ethylenes may be used alone or in combination of two or more.

  The polyolefin resin constituting the stretchable part 40 more preferably includes a polyolefin resin that is not polar-modified and a polyolefin resin that is polar-modified. In addition, the polyolefin resin not polar-modified is a polyolefin resin not polar-modified as described above. The polyolefin resin constituting the expansion / contraction part 40 includes a polyolefin resin that is not polar-modified and a polyolefin resin that is polar-modified, so that the expansion / contraction part 40 composed of a polyolefin-based resin, and a hard vinyl chloride-based resin The band-shaped portion 32 made of resin can be firmly bonded.

  In the present invention, the polar-modified polyolefin-based resin is not particularly limited as long as it is a polyolefin-based resin having a polar group introduced into the molecule. This polar-modified polyolefin resin is not limited to this, but, for example, graft copolymerizes maleic anhydride described in JP-A-7-62024, JP-A-9-27895, and the like. And a maleic anhydride-modified polyolefin having a polar group introduced therein, (meth) acrylic acid 4-t-butylcyclohexyl monomer and a phosphoric acid group-containing vinyl monomer described in JP-A No. 2007-112881 Examples thereof include a polyolefin resin graft-modified with a vinyl monomer.

  More specifically, examples of polar-modified polyolefin resins include DuPont's Husabond (registered trademark) E528, E226Y, E265, and the like; L504, M142, M502, M512, M545, etc .; Admer (registered trademark) NE065, NE827, NF559, NF587, SE800, SF731, QB550, etc. of Mitsui Chemicals, Inc. can be suitably used. The polar-modified polyolefin-based resin may be used alone or in combination of two or more.

  The polyolefin resin is preferable if it contains a polar-modified polyolefin resin. Therefore, the polar-modified polyolefin resin does not necessarily need to be a polar-modified polyolefin resin included at the same time, but is included at the same time from the viewpoint of maintaining the desired properties of the polyolefin resin. It is more preferable that the polyolefin resin is polar-modified.

  The ratio of the polar-modified polyolefin resin in the polyolefin resin constituting the stretchable part 40 is not particularly limited, but is 100 parts by weight of the polyolefin resin not polar-modified contained in the stretchable part. The amount is more preferably 1 part by weight or more, and further preferably 4 parts by weight or more. In addition, the upper limit of the proportion of the polar-modified polyolefin resin in the polyolefin resin constituting the stretchable part 40 is not particularly limited, but the weight of the polyolefin resin not polar-modified contained in the stretchable part is 100 weight. More preferably, it is 50 parts by weight or less, more preferably 30 parts by weight or less, and most preferably 12 parts by weight or less.

  The proportion of the polar-modified polyolefin resin in the polyolefin resin constituting the stretchable part 40 is 1 part by weight or more with respect to 100 parts by weight of the polyolefin resin not polar-modified contained in the stretchable part. It is more preferable because the adhesiveness between the stretchable part 40 made of a polyolefin resin and the band-like part 32 made of a hard vinyl chloride resin is excellent. Further, the proportion of the polar-modified polyolefin resin in the polyolefin resin constituting the stretchable part 40 is 50 parts by weight or less with respect to 100 parts by weight of the polyolefin resin not polar-modified contained in the stretchable part. Thus, the effect of reducing the proportion of the polyolefin-modified resin that is polar-modified and maintaining the properties of the target polyolefin-based resin is achieved, and the effect is more remarkable if it is 30 parts by weight or less.

  The polyolefin resin may contain a metallocene polyethylene. Here, the metallocene-based polyethylene is not particularly limited as long as it is a polyethylene obtained with a metallocene-based catalyst. Metallocene polyethylene has few low molecular weight components, has good impact resistance and ESCR resistance, and is excellent in transparency, low temperature sealability, blocking resistance, low odor resistance, solvent extraction resistance, etc. The polyolefin resin can be modified by mixing with the polyolefin resin. For example, metallocene-based polyethylene can be used by mixing with polyethylene in order to utilize the advantage of being soft with few low molecular weight components.

  When a polyolefin resin containing a metallocene polyethylene is used as the polyolefin resin, the metallocene polyethylene is contained in an amount of 10 to 30% by weight with respect to the whole polyolefin resin not subjected to polar modification contained in the polyolefin resin. More preferably. In other words, the metallocene polyethylene is more preferably contained in an amount of 10 to 30% by weight based on the total of the non-polarly modified polyolefin resin and the metallocene polyethylene other than the metallocene polyethylene contained in the polyolefin resin. preferable. By including 10% by weight or more of metallocene polyethylene, the low low molecular weight component, impact resistance, ESCR resistance, transparency, low temperature sealability, blocking resistance, low odor resistance, solvent extraction resistance, etc. are improved. This is preferable because the rigidity of the stretchable part can be reduced and construction can be easily performed. In addition, it is preferable that the metallocene polyethylene is contained in an amount of 10 to 30% by weight because the tensile yield stress, tensile elongation at break and tensile elastic modulus of the stretchable part are excellent.

  More specific examples of such metallocene polyethylene include Kernel (registered trademark) KF360T and KS240T manufactured by Nippon Polyethylene Corporation.

  The expansion / contraction part 40 should just have each side edge 40a, 40a of the width direction fixed to the said other surface of the strip | belt-shaped part 32, but each width side edge 40a of the expansion / contraction part 40 comprised with polyolefin resin. , 40a and the belt-like portion 32 made of hard vinyl chloride resin are bonded via adhesive layers 25, 25 as shown in FIG. As the adhesive layers 25, 25, for example, an adhesive layer containing a thermoplastic polyurethane-based adhesive can be suitably used. By using such an adhesive, the stretchable part 40 made of a polyolefin resin and the belt-like part 32 made of a hard vinyl chloride resin can be suitably joined.

  Examples of the thermoplastic polyurethane-based adhesive include adhesives including thermoplastic polyurethane, acrylic-modified polyurethane, acrylate-modified polyurethane, polyester-based thermoplastic polyurethane, polyester-based thermoplastic polyurethane, and the like.

  More specific examples of the adhesive include Elastollan (registered trademark) C70A11FG, ET875-10AVS, 1180A10 manufactured by BASF, and Irogran (registered trademark) CA116 manufactured by Huntsman.

  As shown in FIG. 1, the side edges 40a and 40a in the width direction of the stretchable part 40 made of polyolefin resin and the band-like part 32 made of hard vinyl chloride resin are adhesive layers 25 and 25, respectively. However, as shown in FIG. 5, the joiner 80 according to the present embodiment is configured so as to increase the bonding area between the band portion 32 and the adhesive layer 25. You may have the protrusion parts 27 and 27 provided so that it might protrude from another surface. Thereby, two surfaces, the side surface of the protruding portion and the other surface of the strip-shaped portion 32 in contact therewith, can be adhered to the adhesive layer 25, and the adhesive strength can be improved. Moreover, there may be two such projecting portions so as to sandwich the stretchable portion.

In the joiner according to this embodiment, the adhesive strength between the side edges 40a, 40a in the width direction of the stretchable part 40 made of polyolefin resin and the band-like part 32 made of hard vinyl chloride resin is 8N. / Mm ² or more, more preferably 10 N / mm ² or more.

  Here, the adhesive strength between the side edges 40a, 40a in the width direction of the stretchable part 40 made of polyolefin resin and the band-like part 32 made of hard vinyl chloride resin is an example described later. 12 is a value obtained by dividing the maximum load until the stretchable portion 40 and the belt-like portion 32 break at any position by the area of the broken surface.

  The joiner according to the present embodiment is a means for breaking the joiner when the pitch P of the strip-like strip 14 is greatly expanded by, for example, ground vibration in a state where an inner pipe as shown in FIG. 3 is formed. A break is provided. In the present embodiment, a bent portion 82 shown in FIGS. 1 and 2 is provided as a fracture portion.

  As shown in FIGS. 1 and 2, the bent portion 82 has a substantially inverted U-shaped cross section, and is formed by bending a substantially central portion in the width direction of the belt-like portion 32. A notch is formed at the approximate center of the bottom inside the bent portion 82. The bent portion 82 and the cutout portion are formed continuously over the entire length of the band-shaped portion 32 and are formed so as to protrude from the other surface (surface on the existing pipe 12 side) of the band-shaped portion 32. Yes.

  When the inner pipe 16 is formed on the inner surface of the existing pipe 12, as shown in FIGS. 2 and 3, the strip 14 is spirally wound along the inner surface of the existing pipe 12, The protrusion 34 is fitted into each pair of grooves 22 of the strip 14. Thus, the side edges in the width direction of the strip 14 can be joined by the joiner 80. Thereby, the inner tube | pipe 16 can be formed.

  After the inner pipe 16 is formed, a backing material 78 such as cement milk is filled between the inner surface of the existing pipe 12 and the strip 14 and the joiner 80. Then, the clamping part 36 formed in the joiner 80 is embedded in the backing material 78, and after the backing material 78 is cured, the clamping part 36 is firmly fixed to the backing material 78. Note that a gap 84 is formed by the inverted U-shaped bent portion 82 on the one surface 32a of the band-like portion 32 of the joiner 80. However, the gap 84 does not hinder the sewage flow performance of the inner pipe 16, for example. Thus, it is formed in a small dimension (for example, about 1 mm or less). Therefore, it is not necessary to perform post-processing such as filling the gap 84 with a filler such as putty. The expansion / contraction part 40 is also embedded in the backing material 78, but the inner space 40b of the expansion / contraction part 40 formed by the expansion / contraction part 40 and the belt-like part 32 is in a closed state. The insert 78 is not filled.

  According to the joiner 80 according to the present embodiment shown in FIGS. 1 and 2, the pitch P of the strip 14 wound spirally along the inner surface of the existing pipe 12 is slightly reduced, for example, in a direction narrowing or expanding due to ground vibration. In the case of the change, the direction in which the bent portion 82 is closed in a state where the fitting between the protrusions 34 and 34 and the sandwiching portions 36 and 36 of the joiner 80 and the grooves 22 and 22 of the strip 14 is maintained as it is. While elastically deforming in the opening direction, the first and second walls 24 and 26 constituting the protrusions 34 and the holding portions 36 and the grooves 22 of the strip 14 are elastically deformed. Therefore, the joiner 80 does not come off from the strip strip 14. In this state, the watertightness of each pair of fitting portions of the protrusion 34 and the groove 22 is maintained.

  Next, as shown in FIG. 4, when the pitch P of the strip strip 14 is greatly expanded due to, for example, ground vibration, the protrusions 34 and 34 and the sandwiching portions 36 and 36 of the joiner 80, the strip groove 22 of the strip strip 14, Before the fitting with 22 is shifted or removed, the outer portion of the band-shaped portion 32 is broken by the external force that widens the band-shaped portion 32 in the width direction, and the cut portion of the bent portion 82 is formed. As a result, the spread of the pitch P of the strip 14 can be allowed.

  The mechanism when the bent portion 82 breaks is that a gap 84 of the bent portion 82 is widened by an external force (displacement) that expands the belt-like portion 32 in the width direction, and at this time, a large moment acts on the bottom portion 82a of the bent portion 82. Due to the moment, stress concentrates on the bottom portion 82a and breaks from the notch. As described above, since the bottom portion 82a having the cutout portion of the bent portion 82 is broken using the moment acting on the bent portion 82, a predetermined external force (displacement) is applied to widen the belt-like portion 32 in the width direction. Setting for reliably breaking the bent portion 82 can be performed. As a result, damage to the fitting portion between the protrusions 34 and 34 and the sandwiching portions 36 and 36 of the joiner 80 and the grooves 22 and 22 of the strip 14 is surely prevented, and the pitch P of the strip 14 is widened. Can be tolerated.

  Even when the strip portion 32 is broken at the bottom portion 82a of the bent portion 82 and the side portions 44 and 46 of the strip portion 32 are separated from each other, the side portions 44 and the side portions of the joiner 80 that are separated from each other are obtained. The gap 48 between the two can be watertightly sealed by the stretchable part 40.

  Further, when the side portions 44 and 46 of the joiner 80 are separated from each other, the movement of the side portions 44 and 46 can be allowed by expanding the stretchable portion 40. Further, when the side parts 44 and 46 that are separated from each other of the joiner 80 move in the direction approaching each other due to the earthquake motion, the movement of the side parts 44 and 46 is performed by deforming in the direction in which the telescopic part 40 is folded. Can be tolerated. And in each state shown in FIG. 2 and FIG. 4 and each state shown in FIG. 2 and FIG. 4 and the state between these two states, the ridges 34 and 34 of the joiner 80 and the clamping parts 36 and 36, Since a large external force is not applied to the fitting portions of the strip-like strip 14 with the grooves 22, 22, the water tightness of each fitting portion is maintained.

  As described above, even when there is a relatively large earthquake motion, the joiner 80 does not come off from the strip 14 and the water tightness of the inner pipe 16 is maintained, so that the labor for repairing the inner pipe 16 is reduced. be able to.

  Note that any shape other than an inverted U-shape can be applied to the bent portion.

[Second Embodiment]
Next, 2nd Embodiment of the existing pipe renovation member concerning this invention is described based on FIGS. FIG. 6 is a cross-sectional view showing a schematic configuration of a joiner which is an existing pipe rehabilitation member according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view in which a central portion of a joiner that is an existing pipe rehabilitation member according to the second embodiment of the present invention is removed.

  A joiner 102 that is an existing pipe rehabilitation member according to the second embodiment shown in FIG. 6 is obtained by providing a notch 104 in the joiner 80 that is an existing pipe rehabilitation member according to the first embodiment. The notch 104 is a groove, and is formed on the other surface of the strip 32 along the longitudinal direction of the strip 32. Each notch 104 is formed at each position between the side edges 40 a and 40 a of the stretchable part 40 and the bent part 82. According to the joiner 102, as shown in FIG. 6, the inner tube 16 can be formed together with the belt-like strip 14 using the central portion 106 in which the bent portion 82 is formed. 7, for example, a portion of the inner tube 16 can be formed with the strip 14 using the central portion 106 removed. That is, by removing the central portion 106, the widthwise side edges of the strip-shaped strip 14 can be joined to each other by the joiner 102 by being deformed into a shape corresponding to the shape of the inner surface of the existing pipe 12.

[Third Embodiment]
The existing pipe rehabilitation member according to the second embodiment includes a central portion 106 shown in FIGS. 6 and 7, and the central portion can be removed. However, the existing pipe rehabilitation member according to the third embodiment of the present invention is provided. The joiner that is a pipe rehabilitation member does not have the central portion from the beginning.

  Since the joiner according to the present embodiment does not have a central portion, the interval between the pair of protrusions 34 of the joiner can be freely changed. Therefore, the joiner is deformed into a shape corresponding to the inner surface shape of the existing pipe 12 to form a band shape. The side edges in the width direction of the strip 14 can be joined.

[Fourth Embodiment]
A fourth embodiment of an existing pipe rehabilitation member according to the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view showing a schematic configuration of the joiner 10 which is an existing pipe rehabilitation member according to the present embodiment.

  The difference between the joiner 10 that is the existing pipe rehabilitation member according to the present embodiment and the joiner 80 that is the existing pipe rehabilitation member according to the first embodiment is that the pitch P of the strip-shaped strip 14 is greatly expanded by, for example, ground vibration. In this case, as the breaking portion for breaking the joiner, the bent portion 82 shown in FIGS. 1 and 2 is provided in the first embodiment, whereas the notched portion 42 shown in FIG. 8 is provided in the present embodiment. It has just been established. Other than this, since it is the same as that of the first embodiment, equivalent parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the notch part 42 shown in FIG. 8 is provided as a fracture | rupture part. The cutout portion 42 is formed in a groove shape that is recessed toward the one surface on the other surface of the band-shaped portion. In other words, the cutout portion 42 is a groove, and is formed continuously over the entire length of the main body 32 in the same manner as the stretchable portion 40. Note that the side edges 40 a and 40 a and the cutout portion 42 of the stretchable portion 40 are disposed at substantially the center in the width direction of the main body 32.

  When the inner tube 16 is formed on the inner surface of the existing tube 12, as shown in FIGS. 2 and 3, the width direction side of the strip 14 wound spirally is formed as in the first embodiment. Since the edges may be joined by the joiner 10, detailed description thereof is omitted.

  Further, in the fourth embodiment, for example, two notches 104 may be provided between the side edges 40a, 40a of the stretchable portion 40, as in the second embodiment shown in FIGS. Thus, by providing the two notches 104, it can be used with a central portion formed between the two notches 104, and the central portion is removed. Can be used in

[Other Embodiments]
In each of the first to fourth embodiments, the width direction side edges of the strip-shaped strip 14 having the shape shown in FIG. 2 and the like are joined by the joiners 80, 102, 10 and the like. Also for the strip, the side edges in the width direction can be joined by these joiners. Such a strip-like strip may be a strip-like strip having a groove or a ridge that can be joined by fitting the ridges 34, 34 of the joiners 80, 102, 10 and the like.

  Moreover, in each of the first to fourth embodiments, the adjacent side edges in the width direction of the strips spirally wound along the inner surface of the existing pipe are joined by the joiners 80, 102, 10 and the like. Although shown, the strip-side strips installed in the longitudinal direction of the existing pipe along the inner surface of the existing pipe can also be joined to each other in the width direction by these joiners.

  As a strip-like strip installed in the longitudinal direction of the existing pipe along the inner surface of the existing pipe, for example, disclosed in JP-A-2006-29561, which discloses a lining method for rehabilitating the inner face of the existing pipe having a rectangular cross section. The strips (strips) can be joined by joiners 80, 102, 10 or the like.

  Further, the existing pipe rehabilitation member according to the present invention is not limited to the joiner that is the existing pipe rehabilitation member according to each of the first to fourth embodiments, but constitutes a band-shaped main body of the joiner, and the inner pipe One side toward the inside of the belt is flat, and the other side of the belt that faces the outside of the inner tube is provided along the longitudinal direction of the belt. As long as it is a joiner provided with a protrusion that fits with each other, and a stretchable part formed in a band shape along the longitudinal direction of the band-like part, it may have other shapes.

  As described above, the existing pipe rehabilitation member according to the present invention may be a joiner for joining adjacent side edges in the width direction of the strip strip spirally wound along the inner surface of the existing pipe. Moreover, the joiner for joining the adjacent width direction side edges of the strip | belt-shaped strip installed in the longitudinal direction of an existing pipe along the inner surface of an existing pipe may be sufficient.

However, the existing pipe rehabilitation member according to the present invention is not limited to the above-described existing pipe rehabilitation member, but is a strip-like existing pipe rehabilitation member for rehabilitating or protecting the existing pipe, on the inner surface of the existing pipe. Along,
(A) spirally wound, or
(B) installed in the longitudinal direction of the existing pipe,
In addition, the inner pipe is formed inside the existing pipe by interfitting with the side edge in the width direction of the adjacent existing pipe renewal member. A stretchable portion that can be extended and / or shrunk, and the stretchable portion is made of a polyolefin resin, and the existing pipe retreading member excluding the stretchable portion is made of a hard vinyl chloride resin. That's fine.

  Therefore, the existing pipe rehabilitation member according to the present invention is not limited to a joiner, and is provided with a stretchable portion that can be expanded and / or contracted in the width direction, and the stretchable portion is made of a polyolefin-based resin. The existing pipe rehabilitation member excluding the expansion / contraction part may be a belt-like strip made of hard vinyl chloride resin.

  Further, along the inner surface of the existing pipe, one type of existing pipe rehabilitation member is spirally wound or installed in the longitudinal direction of the existing pipe, and the width direction side edge of the adjacent existing pipe rehabilitation member and By fitting each other, it can be applied to a method of forming an inner pipe inside an existing pipe.

  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.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited by an Example.

[Examples 1 to 11]
In order to evaluate the chemical resistance of the expansion / contraction part of the existing pipe rehabilitation member according to the present invention, a test piece was prepared using the polyolefin-based resin shown in Table 1, and the chemical resistance according to Japan Sewerage Association Standard JSWAS K-1. A sex test was performed.

  After kneading the polyolefin resin shown in Table 1 with a roll, the sheet was pressed to produce a sheet, and punched with a mold to produce a 50 mm × 25 mm × 4 mm test piece.

The prepared test piece was dipped in each test solution shown in Table 1 at 60 ° C. for 5 hours, then washed with running water for 5 seconds, and the surface moisture was wiped off with a dry cloth, and then the mass was measured. The degree of mass change was calculated by the following formula. The result is an average value of two test pieces.
Mass change (mg / cm ² ) =
(Mass after immersion of test piece (mg) −Mass before immersion of test piece (mg)) / Surface area of test piece (cm ² )

As shown in Table 1, the test pieces prepared using the polyolefin-based resin have a mass change rate of ± 0.2 mg / cm ² or less with respect to all the test solutions, and are of the Japan Sewerage Association Standard JSWAS K-1. It had chemical resistance.

Example 12
The test piece shown in FIG. 9 was manufactured by molding the joiner shown in FIG. A joiner in which a stretchable part (resin member 1) made of an olefin resin and a belt-like part (resin member 3) made of a hard vinyl chloride resin were joined via an adhesive layer 2 was manufactured by extrusion molding. Table 2 shows the non-polarized olefin resin and polar-modified olefin resin contained in the resin member 1, the hard vinyl chloride resin contained in the resin member 3, and the adhesive contained in the adhesive layer 2. Material was used. The materials constituting the resin member 1, the resin member 3, and the adhesive layer 2 were melted and extruded in a direction perpendicular to the paper surface of FIG. The width d of the cross section perpendicular to the extrusion direction of the resin member 1 was 1 mm. The obtained joiner was cut out such that the length b in the extrusion direction was 20 mm, and then the bottom of the bent portion was broken to obtain a test piece.

  A tensile test was performed by applying a tensile load to each of the pair of resin members 3 in a direction perpendicular to the outer surface of the resin member 3 and away from each other. The tensile test is performed in accordance with JISK7161 (plastic-tensile property test method), although the shape of the test piece and the number of tests are different. AG-Xplus 10kN type tensile test manufactured by Shimadzu Corporation under the condition of 23 ± 2 ° C. This was done using a machine. Table 3 shows the results of observation of the fracture condition of the test piece when the tensile test was performed by changing the ratio of the non-polar-modified olefin resin and the polar-modified olefin resin at three test speeds. Indicates the maximum load until breakage. In Table 3, breakage other than the boundary between the resin member 1 and the adhesive layer 2 is outside the boundary, and the breakage position is shown.

  As shown in Table 3, a resin member containing an olefin resin that is not polar-modified and a polar-modified olefin resin is bonded to a resin member that is made of a hard vinyl chloride resin through an adhesive layer. In the test piece, the existing pipe retreading member was hardly broken between the resin member composed of the olefin resin and the adhesive layer. From this result, if an expansion / contraction part containing an olefin resin that is not polar-modified and a polar-modified olefin resin is used, a belt-shaped part composed of a hard vinyl chloride resin and an expansion / contraction composed of an olefin resin are used. It was shown that the part can be firmly bonded. Moreover, the result of this Example showed that it can adhere | attach more firmly compared with the case where the expansion-contraction part which does not contain polar-modified olefin resin is used.

  Moreover, the ratio of the polar-modified polyolefin resin in the polyolefin resin constituting the stretchable part is 4 to 12 parts by weight with respect to 100 parts by weight of the polyolefin resin not polar-modified contained in the stretchable part. When it is within the range, it can be seen that the adhesive strength is superior because the maximum load is particularly large.

[Examples 13 to 17]
Using a polyolefin resin containing a metallocene polyethylene, a stretchable part containing an olefin resin not polar-modified and a polar-modified olefin resin was produced. At this time, the tensile yield stress, the tensile elongation at break, and the tensile elastic modulus of the stretchable part when the ratio of the metallocene polyethylene contained in the polyolefin resin was changed were measured.

  As a non-polar-modified olefin resin containing metallocene polyethylene and a polar-modified olefin resin, the materials shown in Table 4 were used in the proportions shown in Table 4, and kneaded with a roll to produce a sheet with a press. From the obtained sheet, the test pieces shown in Table 5 were punched out with a mold according to the test items. Tensile yield stress, tensile elongation at break, and tensile modulus were measured by the test methods shown in Table 5. The results are shown in Table 6.

  As shown in Table 6, when the ratio of the metallocene polyethylene is 10 to 30% by weight with respect to the whole polyolefin resin not subjected to polarity modification contained in the polyolefin resin, the tensile yield stress, the tensile elongation at break It can also be seen that the tensile modulus is excellent.

  As described above, the existing pipe rehabilitation member according to the present invention has an expansion and contraction function in the width direction and is excellent in chemical resistance.Therefore, in the non-open-cut pipeline rehabilitation method, when there is a bend or a step in the existing pipe, When rehabilitating non-circular existing pipes, when the pitch of existing pipe rehabilitation members changes due to, for example, an earthquake, the water tightness between the side edges of existing pipe rehabilitation members adjacent to each other can be maintained and adjacent to each other. Since the chemical resistance is excellent also between the side edges of the existing existing pipe rehabilitation members, it can be suitably used to rehabilitate or protect various existing pipes, which is very useful.

DESCRIPTION OF SYMBOLS 1 ... Resin member 2 ... Adhesive layer 3 ... Resin member 80, 86, 88, 90, 102, 10 ... Joiner 12 ... Existing pipe 14 ... Strip-shaped strip 16 ... Inner tube 18 ... Main body 20 of strip-shaped strip 20 ... Leg part 22 ... Groove 23 ... Sealing material 24 ... 1st wall 26 ... 2nd wall 27 ... Projection part 28, 29, 38, 39 ... Engagement part 30 ... Leg part 32 ... Strip-like part 32a ... One side of the strip-like part 34 ... Projection 36 ... clamping part 40 ... expansion and contraction part 40a ... side edge 42 in the width direction 42 ... notch part 82 ... bending part 78 ... backing material 104 ... notch part 106 ... center part

Claims (8)

A strip-shaped existing pipe rehabilitation member for rehabilitating or protecting an existing pipe,
Along the inner surface of the existing pipe,
(A) spirally wound, or
(B) installed in the longitudinal direction of the existing pipe,
In addition, the inner pipe is formed inside the existing pipe by interfitting with the side edge in the width direction of the adjacent existing pipe rehabilitation member,
The existing pipe rehabilitation member is provided with a belt-like portion and a stretchable portion capable of extending and / or shrinking in the width direction.
The existing pipe rehabilitation member, wherein the stretchable part is made of a polyolefin resin, and the band-like part is made of a hard vinyl chloride resin.   The existing pipe rehabilitation member according to claim 1, wherein the polyolefin resin constituting the stretchable part includes a polyolefin resin that is not polar-modified and a polyolefin resin that is polar-modified.   The ratio of the polar-modified polyolefin resin in the polyolefin resin constituting the stretchable part is 50 parts by weight or less with respect to 100 parts by weight of the polyolefin resin not polar-modified contained in the stretchable part. The existing pipe rehabilitation member according to claim 2, wherein   The polar-modified polyolefin-based resin is a maleic anhydride-modified polyolefin having a polar group introduced by graft copolymerization of maleic anhydride, or a (meth) acrylic acid 4-tert-butylcyclohexyl monomer and a phosphate group. The existing pipe rehabilitation member according to claim 2 or 3, which is a polyolefin resin graft-modified with a vinyl monomer containing a vinyl monomer.   The existing pipe rehabilitation member according to any one of claims 1 to 4, wherein the polyolefin resin includes a metallocene polyethylene.   The ratio of the metallocene polyethylene in the polyolefin resin is 10 to 30% by weight with respect to the whole polyolefin resin not subjected to polarity modification contained in the polyolefin resin. Existing pipe rehabilitation member.   The polyolefin resin constituting the stretchable part is joined to the belt-like part via an adhesive layer containing a thermoplastic polyurethane-based adhesive. The existing pipe rehabilitation member described. The said strip | belt-shaped part has a projection part, The polyolefin resin which comprises the said expansion-contraction part is joined to the said strip | belt-shaped part and the said projection part, The any one of Claims 1-7 characterized by the above-mentioned. Existing pipe rehabilitation member.

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