JP4840708B2 - Pipe lining material and manufacturing method thereof - Google Patents

Description

  The present invention relates to a pipe lining material used for repairing pipelines (pipes) such as sewerage, waterworks, gas, agricultural water, and industrial water, and a method for producing the pipe lining material.

  As the pipe lining material, the invention described in Patent Document 1 has been proposed. In the pipe lining material described in Patent Document 1, the outer surface of the tubular resin absorbent material is covered with a plastic film, and the tubular lining material impregnated with the curable resin is inserted into the pipe line to reduce the fluid pressure. In the pipe lining material before resin impregnation used in the method of repairing the pipeline by curing the curable resin in the acted and spread state, a strip shaped body with a plastic film welded to the outer surface of the nonwoven fabric constituting the tubular resin absorbent material A stitching hole through which a sewing thread for stitching is passed in advance is provided at both end portions of the present invention (claim 1). Further, a sealing ribbon tape is provided in the vicinity of the stitching portion constituting the stitching hole (claim 3).

  That is, in the pipe lining material 1 described in Patent Document 1, a resin adsorbent sheet (nonwoven fabric 1a) coated on one side with a plastic film 1b is stitched at both ends (stitched portions 1d) so that the plastic film becomes the outer surface. The left and right stitched portions 1d (joined portions) are sealed with a sealing ribbon tape 6 (see FIG. 4) made of a strip-shaped plastic film.

  However, when the seam 1d is sealed with the sealing ribbon tape 6, the sealing ribbon tape 6 is melted with a heater and welded to the plastic film 1b coated on the resin adsorbent sheet (nonwoven fabric 1a) for sealing. However, the sewing thread 5 bites into the sealing ribbon tape 6, and the sealing ribbon tape 6 is locally thinned at that portion, and pinholes often occur.

  Therefore, instead of joining by stitching, the reinforcing material 2 is bonded and joined to the back side of the joined portion, and then the joined portion is sealed with the sealing ribbon tape 6 to locally reduce the thickness of the sealed ribbon tape 6 with the sewing thread 5. Attempted to prevent. However, since there is no thread crossing the joint, the sealing ribbon tape 6 melts into the joint at the time of welding, and the sealing ribbon tape 6 becomes a concave cross section at the joint, and if the pipe lining material is pressurized at the time of construction, it may tear. .

  On the other hand, when the sealing ribbon tape 6 is welded to the plastic film 1b coated on the outer surface of the resin adsorbent sheet at the conventional joint, the sealing ribbon tape 6 is melted and welded to the plastic film 1b with a heater such as a heater. Therefore, the fact that the sealing ribbon tape 6 was melted more than necessary was one of the causes of the problems such as the sewing thread 5 biting into the sealing ribbon tape 6 or the sealing ribbon tape 6 melted at the joint portion being melted. It was.

JP 2006-35755 A

  In view of this, the present invention is to ensure that on-site construction can be carried out without causing problems such as pinholes even when the sewing thread 5 bites into the sealing ribbon tape 6 in sealing the joint portion. In joints that are not used, the sealing ribbon tape 6 is prevented from tearing during construction even if the sealing ribbon tape 6 melts into the joint at the time of welding, and the sealing ribbon tape 6 is more than necessary when the sealing ribbon tape 6 is welded to the joint. Provided is a pipe lined material and a method for producing a pipe lining material for the purpose of welding to a plastic film 2 coated firmly on a resin absorbent sheet without heating.

  In order to solve the above-mentioned problems, the present invention first forms a tubular body in which a sheet-shaped resin adsorbent coated with a plastic film on one side is joined to both ends so that the plastic film surface is the outer surface. And a first sealing ribbon tape that covers the joint, and a second sealing ribbon tape that is wider than the first sealing ribbon tape and is welded to the plastic film over the first sealing ribbon tape, The joining portion was sealed with the first and second ribbon tapes to form a pipe lining material.

  In addition, in a tubular body that forms a joint part in which both ends are joined to a sheet-like resin adsorbent coated with a plastic film on one side so that the plastic film surface is the outer surface, the plastic film near the joint part is After heating, the melted sealing ribbon tape was extruded from an extruder, and the joining portion was sealed.

  Furthermore, in the tubular body which forms the joint part which joined the both ends so that the said plastic film surface may become the outer surface, the sheet-like resin adsorbent which coated the plastic film on the single side | surface WHEREIN: First sealing of a plastic film raw material to the said joint part A ribbon tape is disposed, and the first ribbon tape is heated with a heater to be softened or melted, and the molten ribbon tape is extruded from an extruder wider than the first sealed ribbon tape, A method for manufacturing a pipe lining material, wherein the joint portion is hermetically overlapped and sealed.

  In addition, after the molten ribbon tape is extruded from an extruder, the molten ribbon tape is pressed by a pressing roller, and is configured as a method for manufacturing a pipe lining material according to any one of the above, and hot water is contained in the pressing roller. Circulating or storing, the temperature of the pressure roller is controlled, and the manufacturing method of the pipe lining material is configured, and the heating width of the heater is a width of the width at which the second sealing ribbon tape is fused. The pipe lining material manufacturing method according to any one of the above, characterized in that it is 2 times or less and the width of the pressing roller is 1.2 times or more of the width of the second sealing ribbon tape.

  As in the invention of Patent Document 1, in the method of melting the sealing ribbon tape 6 made of a strip-shaped plastic film disposed on the joint with a heater, the sealing ribbon tape 6 is heated and further coated underneath. In order to melt the plastic film and weld both sides, the sealing ribbon tape 6 is excessively melted, and the coated plastic film is melted to the minimum necessary for welding, so most of the sewing thread is the sealing ribbon. I was biting into the tape 6. On the other hand, the method of manufacturing the pipe lining material of the present invention, that is, the enlargement of the broken-line circle A in FIG. 2 can be achieved only by extruding the molten ribbon tape onto the heated plastic tape as in the third embodiment. As shown in the figure, the sewing thread 2d digs deeply into the coated plastic film 2a as well as the sealing ribbon tape side, so that a thin portion was not formed and pinholes were not generated. Further, since the sealing ribbon tape is not melted excessively, the molten ribbon tape directly extruded from the extruder 7 in the sealing process of the joint portion 2c of the tubular body 2 joined by a joining method other than sewing is not used. The problem of melting into the joint 2c is eliminated.

  Further, as shown in Examples 1, 2, and 4, by using the first and second sealing ribbon tapes 3 and 4, first, the sewing thread 2d is bitten into the narrow first sealing ribbon tape 3, and the second The joint 2c is sealed with a sealing ribbon tape. As a result, the sewing thread 2d does not bite into the second sealing ribbon tape 4, and the problem of pinholes in the sealing ribbon tape has been solved. When the sewing thread 2d is not used, only the first sealing ribbon tape 3 melts into the joint portion 2c, so that no thinning phenomenon occurs in the second sealing ribbon tape 4.

  Further, as a secondary effect, when the first sealing ribbon tape 3 is a belt-like polyethylene film, the first sealing ribbon tape 3 is melted simultaneously with preheating in the vicinity of the joint portion 2c and is welded to the joint portion 2c. Therefore, preheating in the vicinity of the joint 2c and heating of the first sealing ribbon tape 3 can be performed at the same time, and there is no reduction in work efficiency due to welding of the first sealing ribbon tape 3. Such a method not only enabled the joint 2c to be efficiently sealed, but also solved the problems of pinholes and tears.

It is a cross-sectional schematic diagram in the case of suture joining of the pipe lining material which is this invention. It is a cross-sectional enlarged schematic diagram of the junction part of FIG. It is a cross-sectional schematic diagram in the case of joining using the reinforcement material of the pipe lining material which is this invention. It is a cross-sectional enlarged schematic diagram of the junction part of FIG. It is a figure which shows the manufacturing process of the pipe lining material which is this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic sectional view in the case of suture joining of a pipe lining material according to the present invention. FIG. 2 is an enlarged schematic cross-sectional view of the joint of FIG.

  A pipe lining material 1 according to the present invention includes a tubular body 2, a first sealing ribbon tape 3, and a second sealing ribbon tape 4, and the first and second ribbon tapes 3 and 4 are joined to both ends of the tubular body 2. The part 2c is sealed.

  The tubular body 2 forms a joint portion in which both ends of a sheet-like resin adsorbent coated with a plastic film on one side are joined so that the plastic film surface becomes an outer surface.

  As the resin adsorbent 2b, a polyester non-woven fabric or a polyester non-woven fabric combined with glass fibers is suitable because it is inexpensive. The thickness is about 0.5 mm to 10.0 mm, the width is about 1.0 m to 3.0 m, and it is appropriately selected depending on the conditions such as the diameter of the road pipe to be laid and the length.

  As the plastic film 2a, polyethylene and polypropylene are preferable because they are inexpensive. Among them, polyethylene obtained by using metallocene as a catalyst is most suitable. The thickness is preferably 0.1 mm to 2.0 mm, and the width is about 0.9 m to 2.5 m depending on the width of the resin adsorbent 2b. The plastic film 2a can be implemented by extruding in a melted state on one side of the resin adsorbent 2b.

  Next, the resin adsorbing material 2b and the plastic film 2a are passed between the rotating rollers, and are firmly pressed against each other for coating. When the resin adsorbent 2b is heated in the range of 30 ° C. to 90 ° C. in this coating operation, good coating strength can be obtained. Further, when the resin adsorbent 2b is a needle punched non-woven fabric using a sewing needle or the like, the fibers constituting the resin adsorbent 2b (for example, a thickness of 1 to 10 denier and a length of 30 to 100 mm) are pushed by the needle. The plastic film 2a may be coated on the side that has been pulled out.

  Thus, the sheet | seat of the resin adsorbent which coated the plastic film is cut according to the conditions of the pipe line to construct, and the both ends of a longitudinal direction are joined and processed into a tubular body.

  As a joining method, two methods can be employed: a stitching method using the sewing thread 2d (Example 1) and a method of adhering the reinforcing material 6 to the back surface of the joined part 2c (Example 2). When a thick pipe lining material is obtained, only the resin adsorbing material 5 is processed into a tubular shape (for example, a stitched joint with the sewing thread 5a) and arranged in a single-layer or multi-layer structure.

  Both the first sealing ribbon tape 3 and the second sealing ribbon tape 4 are preferably made of polyethylene, and among them, polyethylene obtained using metallocene as a catalyst is optimal. The 2nd sealing ribbon tape 4 is wider than the 1st sealing ribbon tape 3, is piled up on the 1st sealing ribbon tape 3, and is affixed on the tubular body 2, and seals the junction part 2c. As a sealing method, the first and second sealing ribbon tapes are melted by heat. Details of the method of sealing the joint 2c will be described in Example 3.

  When the joint 2c is sealed with the first and second sealing ribbon tapes according to the fourth embodiment, the sewing thread 2d is not only the first sealing ribbon tape but also the brass as shown by the broken circle A in FIG. It also digs deeply into the tic film 4d. The dotted line in the circle A indicates the position of the sewing thread 2d when the sealing ribbon tape 6 is placed by the method shown in Patent Document 1 and then heated to seal the joint 2c. In the method shown in Patent Document 1, the sewing thread 2d is hardly buried on the plastic film 4 side.

  In Patent Document 1 and the present invention, there is a difference between the single-pointed arrows shown on the left of the circle A in the biting into the ribbon tape, and the difference does not cause a thin portion to be formed in the first sealing ribbon tape 3, and the pinhole It is a cause not to generate. Further, the sewing thread 2d does not bite into the second sealing ribbon tape. As a result, the strength and sealing performance of the joint 2c are extremely stable.

  Next, the case where the both ends of the tubular body are joined not by sewing but by a reinforcing material will be described. FIG. 3 is a schematic cross-sectional view in the case of joining using the reinforcing material of the pipe lining material according to the present invention. FIG. 4 is an enlarged schematic cross-sectional view of the joint of FIG.

  The pipe lining material 1a according to the present invention includes a tubular body 2, a reinforcing material 6, a first sealing ribbon tape 3, and a second sealing ribbon tape 4, and the first and second ribbon tapes 3 and 4 are tubular bodies. The joint portions 2c at both ends of 2 are sealed. The same reference numerals and names mean the same members and functions as in the embodiment.

  The reinforcing material 6 is appropriately selected from a strip-shaped walliff, non-woven fabric, woven fabric, a composite of two or more thereof, and is attached to the inside of the tubular body 2 at the position of the joint portion 2c with an adhesive 6a or the like. Thereby, the joining strength of the joining part 2c is maintained similarly to the sewing with the sewing thread 2d.

  The horizontal length of the reinforcing material 6 is provided so as to slightly protrude from the end portions of the plastic film 2a and the resin adsorbing material 2b. This is to increase the strength and air tightness of the resin adsorbent 2b. In addition, the thickness of the reinforcing material 6 is preferably the same as the thickness of the plastic film 2a or 5 mm or less.

  As in Example 4, when the joining portion 2c is sealed with the first and second sealing ribbon tapes, the melt into the joining portion 2c is only the first sealing ribbon tape. There is no thinning phenomenon. Thereby, even if it is a case where the joining part 2c is joined by the reinforcing material 6 without using a suture thread, the strength and sealing performance of the joining part 2c become extremely good.

  Next, referring to FIG. 5, an example of a specific method for sealing and joining both ends of a tubular body using a molten ribbon tape, that is, a method not using the first sealing ribbon tape 3 in FIG. 5 will be described.

  As described in Examples 1 and 2, both ends of the sheet-like resin adsorbent 2b coated with the plastic film 2a are joined to form tubular bodies 2 and 7, and then the joined part 2c is formed as follows. And seal.

  Hereinafter, the tubular body 2 is demonstrated as a thing of Example 1 below. First, the tubular body 2 is arranged so that the joint portion 2c is on the top, and sequentially sent in the length direction by a rotating roller or a belt conveyor. And the sealing work of the junction part 2c is performed, sending the tubular body 2. FIG.

  First, the vicinity of the joint 2 c is heated by the heater 7. When the plastic film 2a is polyethylene, the heated surface temperature is preferably 110 ° C to 180 ° C. After the plastic film 2a in the vicinity of the joining portion 2c is sufficiently heated, the molten ribbon tape 4a is pushed out to the joining portion 2c by the extruder 8 and pressed by the pressing roller 9 to be firmly welded to the plastic film 2a.

  At this time, the extruded sealing ribbon tape preferably has a width of about 20 mm to 100 mm and a thickness of about 0.1 mm to 2.0 mm. And the temperature of the press roller 9 has preferable 40 to 100 degreeC.

  Even if two kinds of the first and second sealing ribbon tapes 3 and 4 are not used, that is, even if the sealing ribbon tape is a single layer, the fusion ribbon tape is fused to the heated plastic film to join the two. The sealability and strength of the portion 2c can be sufficiently secured.

  Next, a sealing method for the purpose of preventing pinholes and tears caused by suture sealing of the joint 2c with the sewing thread 2d will be described.

  FIG. 5 is a diagram showing a manufacturing process of the pipe lining material 1 according to the present invention. It is sectional drawing in FIG. 1A-A arrow. In FIG. 5, since it is the AA cross section of FIG. 1, the joining surface 2e of one edge part can be seen. A one-dot chain line is the sewing threads 2d and 5a.

  As described in Examples 1 and 2, both ends of the sheet-like resin adsorbent 2b coated with the plastic film 2a are joined to form tubular bodies 2 and 7, and then the joined part 2c is formed as follows. And seal.

  First, similarly to Example 3, the tubular body 2 is arranged so that the joint portion 2c is on the upper side, and sequentially sent in the length direction by a rotating roller or a belt conveyor. And the sealing work of the junction part 2c is performed, sending the tubular body 2. FIG.

  When the plastic film to be coated is polyethylene, first, the first sealing ribbon tape 3 made of a strip-like polyethylene having a width of about 10 mm to 50 mm and a thickness of about 0.2 mm to 1.5 mm is attached to the joint 2c. It is put on and heated by the heater 7 so that the surface temperature of the first sealing ribbon tape 3 becomes about 110 ° C. to 180 ° C.

  The second sealing ribbon tape 4 wider than the width of the first sealing ribbon tape is used as the molten ribbon tape 4a from the extruder 8 so as to be superimposed on the softened ribbon tape 3a of the sufficiently heated first sealing ribbon tape 3. Extrude and drop. The width of the second sealing ribbon tape 4 is preferably set to about 1.5 to 4.0 times that of the first sealing ribbon tape 3.

  Further, the thickness of the molten ribbon tape 4a is arbitrarily adjusted and extruded within a range of about 0.2 mm to 2.0 mm. In the preheating of this step, the coated plastic film 2a in the vicinity of the first sealing ribbon tape 3 is heated in the same manner. The heating range is preferably narrower than the width of the second sealing ribbon tape 4.

Next, both the first and second sealing ribbon tapes 3 and 4 are pressed against the coated plastic film 2a by the pressing roller 9 and firmly welded. The temperature of the pressing roller 9 at this time is preferably about 40 ° C. to 100 ° C. as in the third embodiment. Further, the welding boundary between the second sealing ribbon tape 4 and the plastic film 2a may be pressed by the pressing roller 9 until it becomes smooth.

  In the heating and sealing operation, it is important that the boundary between the welded portion of the second sealing ribbon tape 4 and the coated plastic film 2a is not overheated in the preheating. Accordingly, the heating width by the heater 7 such as a heater used for preheating should not exceed 1.2 times the width at which the second sealing ribbon tape 4 is fused, while the width of the pressing roller 9 is The width is preferably 1.2 times or more wider than the width of the second sealing ribbon tape 4.

  The temperature of the pressing roller 9 is preferably adjusted by circulating hot water in the pressing roller 9 and adjusting the temperature with the warm water.

  The pipe lining material 1 thus completed is impregnated with a liquid thermosetting resin such as unsaturated polyester, epoxy resin, or vinyl ester resin to produce a resin-impregnated tube. After that, the resin-impregnated tube sticks to the wall surface of the pipe by being inverted and inserted into the old pipe and heated by fluid pressure, and the pipe lining material is cured as the resin is cured while maintaining the state. . A plastic pipe made of a resin-impregnated tube is completed in the old pipeline, and the old pipeline is restored.

  The pipe lining material according to the present invention can be used for repairing pipelines such as water and sewage, and greatly contributes to the water and sewage management industry.

DESCRIPTION OF SYMBOLS 1 Pipe lining material 1a Pipe lining material 2 Tubular body 2a Plastic film 2b Resin adsorption material 2c Joining part 2d Sewing thread 2e Joining surface 3 First sealing ribbon tape 3a Softening ribbon tape 4 Second sealing ribbon tape 4a Molten ribbon tape 5 Resin adsorption Material 5a Sewing thread 6 Reinforcing material 6a Adhesive 7 Heater 8 Extruder 9 Press roller

Claims (6)

A tubular body that forms a joined portion obtained by joining both ends of a sheet-like resin adsorbent coated with a plastic film made of polyethylene having a thickness of 0.1 mm to 2.0 mm on one side so that the plastic film surface is an outer surface;
A first sealed ribbon tape having a thickness of 0.2 mm to 1.5 mm made of polyethylene, which is placed at the joint and then heated and softened or melted ;
The first sealing ribbon tape wider than the first sealing ribbon tape, softened or melted , extruded in a molten state with a thickness of 0.2 mm to 2.0 mm, pressed with a pressing roller and welded to the plastic film. It consists of two sealed ribbon tapes,
A pipe lining material, wherein the joint is sealed with the first and second sealing ribbon tapes. 2. The pipe lining material according to claim 1, wherein the joining portion is joined with a sewing thread, and the sewing thread is in a position buried in both the plastic film and the first sealing ribbon tape. The bonding portion is bonded to a back side of the plastic film by bonding a reinforcing material, and a recess due to melting of the first sealing ribbon tape is filled with the second sealing ribbon tape. Item 2. The pipe lining material according to item 1. In a tubular body that forms a joined portion in which both ends are joined to each other such that the plastic film surface is an outer surface of a sheet-like resin adsorbent coated with a plastic film made of polyethylene having a thickness of 0.1 mm to 2.0 mm on one side,
A first sealing ribbon tape polyethylene thickness 0.2mm~1.5mm placed on the joint, heating the first sealing ribbon tape 110 ° C. to 180 ° C. in the heating and simultaneously heating machine of the plastic film Then, soften or melt, extrude the melted second sealing ribbon tape to a thickness of 0.2 mm to 2.0 mm from an extruder, and layer it on the first sealing ribbon tape. A method for manufacturing a pipe lining material, wherein the joint portion is sealed by pressing with a pressing roller. The method for producing a pipe lining material according to claim 4, wherein hot water is circulated or stored in the pressing roller, and the temperature of the pressing roller is controlled to 40 ° C to 100 ° C. The heating width of the heater is not more than 1.2 times the width at which the second sealing ribbon tape is fused, and the width of the pressing roller is not less than 1.2 times the width of the second sealing ribbon tape. The method for producing a pipe lining material according to claim 4 or 5, wherein:

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