JP2014231154A - Method for producing pipe lining material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a pipe lining material, which can improve tensile strength thereof.SOLUTION: A method for producing a pipe lining material comprises producing a resin pipe inside a pipe to be repaired by pasting the pipe lining material on an inner surface of a pipe conduit and curing a curable resin. The curable resin is liquid and a cured material thereof has a tensile elongation of 3.0% or more and is impregnated into a pull-in liner and an inversion liner. The pull-in liner, fabricated in a tubular form by bonding end parts of a belt-like reinforcing felt, a composite of woven and non-woven fabrics, in a width direction and having an elongation of 10 to 30%, is pulled in and placed in a pipe to be repaired. Inside the pull-in liner is inversion-inserted the inversion liner comprising a tubular non-woven fabric having an elongation of 60% or more and covered with a resin film. The inversion liner and the pull-in liner are compressed together and, in a state where the liners are stretched by 1 to 8%, the curable resin is cured and, thereby, the pull-in liner and the inversion liner are united inside the pipe to be repaired.

Description

  The present invention relates to a method of manufacturing a pipe lining material, more specifically, impregnated with a liquid curable resin, inserted into an existing pipe line, and pressure-applied to a pipe wall surface to be cured, The present invention relates to a method for manufacturing a pipe lining material capable of repairing an agricultural water pipe and a sewer pipe.

  Conventionally, for the restoration of agricultural waterways, sewer pipes, water pipes, etc., a resin adsorbent that is a fiber layer in which glass fibers or polyester fibers are made into a nonwoven fabric by needle punching has been used. The technology regarding the pipe lining material which can ensure the intensity | strength and elasticity at the time of pipe lining using the nonwoven fabric of resin, and the resin adsorbent for pipe lining materials is exhibited. As described above, in order to improve the strength of the pipe lining material, there are known a method of improving the bending elastic modulus and tensile strength by using glass fibers and a method of improving the tensile strength by using woven fabric.

  The method of curing a tube lining material using glass fibers has a feature that improves both the flexural modulus and the tensile strength, and the method using a woven fabric has a feature that improves the tensile strength of the tube lining material. These have been used as inexpensive materials in pipes with high internal pressure that require high tensile strength. However, when the elongation rate of the impregnating resin and the elongation rate of the woven fabric are not compatible, the effect cannot be exhibited. In order to exert the effect of the woven fabric, there has been a problem of improving the tensile strength by appropriately determining and combining the elongation rate of the impregnating resin, the elongation rate of the woven fabric, and the dimensions of the woven fabric.

JP 2013-82144 A

  The objective of this invention is providing the manufacturing method of the pipe lining material which can improve tensile strength.

  The method of manufacturing a pipe lining material according to the present invention is a method of applying pressure to a pipe lining material and sticking it to the inner wall surface of a repair pipeline, and curing the curable resin while maintaining this state, whereby a resin pipe is provided inside the repair pipe. The curable resin is a liquid and has a tensile elongation rate of 3.0% or more in a single resin after curing, and is impregnated in a drawing liner and a reversing liner. A pull-in liner with a stretch ratio of 10 to 30% processed into a tubular shape by joining the end portions in the width direction of the belt-shaped reinforcing felt in which the woven fabric and the non-woven fabric are combined is drawn into the repair pipe, and the pull-in is performed. Insert a reverse liner made of non-woven fabric with a stretch rate of 60% or more covered with a resin film on the inside of the liner, press the reverse liner and the pull-in liner together, and pull 1-8% In situ state curing the curable resin, characterized in that coalesces inverted liner and pull the liner within the repair tube.

  The pull-in liner is characterized in that a joint portion at a width direction end portion of the reinforcing felt is reinforced by adhering a woven fabric or a reinforcing felt ribbon tape.

  The draw-in liner is characterized in that a joint portion at a width direction end portion is overlapped and stitched.

  The pull-in liner is characterized in that the circumference before pressurization is set to be smaller within a range of 92 to 99% with respect to the dimension in a state where the perimeter before pressurization is applied to the inner wall surface of the repair pipe.

  The reversing liner is characterized in that a circumferential length before pressurization is set to be smaller in a range of 85 to 95% with respect to a dimension in a state where the circumference is pressurized and attached to the inner wall surface of the repair pipe.

  The lead-in liner has an outer surface covered with a resin film or a resin film coating felt.

  The lead-in liner is impregnated with a curable resin and then inserted into a repair pipe.

  The lead-in liner is impregnated with a curable resin after being inserted into the repair pipe.

  According to the method for manufacturing a pipe lining material according to the present invention, the reinforcing felt of the draw-in liner is manufactured by joining a nonwoven fabric to a woven fabric having a tensile elongation of 30% or less by needle punching. The fabric can be intertwined tightly to improve the tensile strength. Moreover, since the woven fabric having an elongation of 10 to 30% is cured by being combined with the curable resin in a state of being stretched and tensioned by 1 to 8% at the time of curing, the cured material can have higher strength. Furthermore, since the curable resin used has a tensile elongation rate of 3.0% or more as a single unit after curing, the tensile strength can be improved by following the elongation of the woven fabric in the reinforcing felt. Further, since the nonwoven fabric having a large elastic modulus is used by increasing the elongation of the woven fabric of the reverse liner to 60%, there is an effect of preventing “wrinkles” generated on the inner surface.

It is a figure which shows the 1st example (3a) of the drawing-in liner by this invention. It is a figure which shows the 2nd example (3b) of the drawing-in liner by this invention. It is a figure which shows the 3rd example (3c) of the drawing-in liner by this invention. It is a figure which shows the 4th example (3d) of the drawing-in liner by this invention. It is a figure which shows the detail of the junction part A of FIG. It is a figure which shows the detail of the junction part B of FIG. FIG. 3 is a diagram showing a reversal liner according to the present invention. It is a figure which shows the manufacture condition of the pipe lining material by this invention. It is a figure which shows the manufacture condition of the pipe lining material by this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  First of all, the pipe lining material 1 includes a drawing-in liner 3 and a reversing liner 4. (1) First, a belt-like reinforcing felt 2 in which a resin woven fabric and a resin nonwoven fabric are combined is manufactured, both sides of the reinforcing felt 2 are joined and processed into a tubular shape, and impregnated with a curable resin. The drawing liner 3 is manufactured by covering the tube surface with the resin film coating felt 5. (2) Separately, the opposite sides in the width direction of the nonwoven fabric are joined and processed into a tubular shape, the surface is covered with the resin film 7, and the tubular reversal liner 4 is manufactured as the resin film coating felt 5. The inside is impregnated with a curable resin. (3) Next, the tubular lead-in liner 3 is inserted into the repair pipe 10, and the reverse liner 4 is reversely inserted into the pull-in liner 3 inserted into the repair pipe 10. Unite. Thus, the pipe lining material 1 is manufactured in the repair pipe 10.

  1 to 4 are views showing four examples of a retractable liner according to the present invention. The pull-in liner 3a of FIG. 1 is provided with a tubular body of a belt-like reinforcing felt 2 on the inner side and a tubular body of a resin film coating felt 5 on the outer side. As shown in the joining portion A, the belt-like reinforcing felt 2 is formed into a tubular shape, and both ends thereof are joined together by stitching or a reinforcing felt ribbon tape 6a. Both ends of the width method of the resin film coating felt 5 are sewn and sealed with a sealing ribbon tape 6b.

  The pull-in liner 3b of FIG. 2 is provided with a tubular body of the belt-like reinforcing felt 2 on the inner side and a tubular body of the resin film coating felt 5 on the outer side. The method of joining is different from FIG. The reinforcing felt 2 of the lead-in liner 3b is formed into a tubular shape, and is folded and joined by bonding or stitching as shown in the joint portion B. Moreover, the both ends of the width direction of the resin film coating felt 5 are joined so that it may be pinched | interposed by both sides with the sealing ribbon tape 6b and the nonwoven fabric ribbon tape 6c. When the non-woven ribbon tape 6c is not used, it may be sewn.

  The lead-in liner 3c of FIG. 3 is provided with a tubular body of the belt-like reinforcing felt 2 on the inner side and a tubular body of the resin film 7 on the outer side. Both ends of the reinforcing felt 2 are joined as shown in the joint portion B to have a tubular shape. The joining method is any one of adhesion, adhesion, and stitching.

  The pull-in liner 3d in FIG. 4 is provided with a tubular body of the nonwoven fabric 8 on the inside, a tubular body of the reinforcing felt 2 on the outside, and a tubular body of the resin film coating felt 5 on the outside. It is. Both ends of the nonwoven fabric 8 in the width direction are stitched and reinforced with the nonwoven fabric ribbon tape 6 c, and both ends of the belt-shaped reinforcing felt 2 are joined as shown by a joint A. Both ends in the width direction of the resin film coating felt 5 are stitched and sealed with a sealing ribbon tape 6b.

  FIG. 5 is a diagram showing details of the joint A in FIGS. 1 and 4. Both ends of the reinforcing felt 2 are lock-sewn and joined with a reinforcing felt ribbon tape 6a. FIG. 6 is a diagram showing details of the joint B in FIGS. 2 and 3. Both ends of the reinforcing felt 2 are stitched together.

"Production of retractable liner 3"
The reinforcing felt 2 is manufactured as follows using a woven fabric and a non-woven fabric. First, a woven fabric is produced by weaving polyester, polyamide (nylon), vinylon, polyethylene, polypropylene, or the like. The thickness of the woven fabric is 0.10 to 3.0 mm. The tensile elongation of the woven fabric is preferably 30% or less in both the longitudinal direction and the transverse direction. It is preferable that the tensile strength and the tensile elongation are equal or within a difference of at least 30% in the longitudinal and transverse directions. The nonwoven fabric has a thickness of 2 to 10 denier, and plastic fibers such as polyester, polyamide (nylon), and polypropylene are used. The basis weight is 100 to 300 g / m ² . The nonwoven fabric is manufactured by needle punching or spunbonding. The woven fabric is sandwiched between two nonwoven fabrics, and the nonwoven fabric is tightly entrapped in the woven fabric by needle punching. In this way, a belt-like reinforcing felt 2 having a width of 1000 to 2300 mm is manufactured.

  The reinforcing felt 2 pressurizes the lead-in liner, and sets the circumference to be small in the range of 92 to 99% with respect to the dimension in a state of being attached to the pipe wall surface of the repair pipe 10. The setting of the circumference is changed according to the elongation percentage of the woven fabric to be used. It is effective that the elongation rate of the woven fabric is as small as possible. However, if the elongation rate is too small, it is preferable to have an elongation rate of 10 to 30% in consideration of the pipe diameter error of existing pipes and the followability of pipe bending. However, since the yarn of the woven fabric is damaged by the needle punching process combining the nonwoven fabric, the elongation of the reinforcing felt 2 may change irregularly. In order to maximize the tensile strength, it is preferable to maintain the woven fabric as tensioned as possible at the time of curing.

  When the circumference is set, the reinforcing felt 2 is cut to the set dimension. At this time, when it is determined that a seam allowance is necessary in the step of processing into a tubular shape, a seam allowance of about 30 to 150 mm is secured. After locking and stitching the widthwise end of the cut reinforcing felt 2, the stitched portion is reinforced with a reinforcing felt ribbon tape cut to a width of 30 to 200 mm. Further, this reinforcement may be performed with a woven fabric. The reinforcing felt ribbon tape can follow the reinforcement of the stitched portion of the reinforcing felt processed into a tubular shape by stitching and the elongation of the tubular reinforcing felt by bonding with an adhesive. Moreover, it is desirable to make it tense at the time of hardening. (See Figure 5)

  As another method, the seam allowance may be 30 to 150 mm, and both end portions in the width direction may be sewn and overlapped. At this time, the number of overlapped stitches is preferably plural, three or more. (See Figure 6)

  The force acting when the reinforcing felt 2 is stretched by 10% is preferably 30 to 60% of the tensile strength of the woven fabric. The elongation ratio by pressurization during curing is preferably 1 to 8%. After the reinforcing felt 2 is processed into a tubular shape, a resin film is coated on the outer surface, or the nonwoven fabric is covered with a belt-shaped resin film coating felt in which a resin film is coated on a non-woven fabric to produce a retractable liner. When it is desired to increase the thickness of the lead-in liner, the reinforcing felt may be a multilayer. A non-woven fabric of 100% polyester felt or a glass fiber composite felt layer is added, end portions in the width direction are joined in the same manner as the reinforcing felt, processed into a tubular shape, and layered.

  FIG. 7 shows a reversal liner according to the present invention. Both ends of the resin film coating felt 5 are joined and processed into a tubular shape.

"Production of reverse liner 4"
The reversing liner 4 is provided for making the pipe lining material 1 airtight or fluid-sealing, finishing the inner surface smoothly, and increasing the wall thickness. The reverse liner 4 uses a resin film of 0.15 to 2.0 mm of polyethylene, polyurethane, vinyl chloride, polypropylene or the like in order to provide airtightness or fluid sealing. These resin films are coated on a nonwoven fabric and used as a resin film coating felt 5.

In order to prevent the occurrence of “wrinkles” in the tube lining material 1 and to smoothly finish the inner surface, a method of stretching the reversing liner 4 having a small diameter is generally used. However, it is difficult to prevent “wrinkles” by simply stretching an easily stretchable material. A material having a high tensile modulus and a large elongation is required. Therefore, the circumference of the resin film coating felt 5 in which the basis weight of the polyester felt subjected to needle punching is 500 to 1200 g / m ² , the elongation in the width direction is 60% or more, and the nonwoven fabric having a high tensile elastic modulus is coated with the resin film. The length is set as small as 80 to 95% of the state in which the pipe lining material 1 is stuck to the wall of the repair pipe 10, and the wrinkles are prevented by stretching the pipe lining material 1 during processing.

  The resin film coating felt 5 is cut into a design circumference, and both ends of the belt are stitched into a tubular shape. Next, the stitched portion is sealed with a sealing ribbon tape 6b to be in an airtight state, and the reversal liner 4 is manufactured. The reversal liner 4 may be used alone as a coating felt, or when it is desired to increase the plate thickness, only the nonwoven fabric may be processed into a tubular shape.

About curable resin
As the liquid curable resin, a thermosetting resin such as an unsaturated polyester resin, an epoxy resin, or a vinyl ester resin is mainly used. In order to fully demonstrate the effect of the reinforcing felt 2 that combines woven fabric and non-woven fabric, and to improve the strength of the cured material, the tensile elongation of the template-like curable resin alone (casting plate) is 3.0% or more. Therefore, it is necessary to improve the tensile strength of the reinforcing felt 2 that is a composite material of the cured resin and the woven fabric. However, when the tensile elongation is increased, the elastic modulus of the curable resin is decreased, and the rigidity of the tubular pull-in liner 3 is decreased. Therefore, the higher the tensile elongation, the better, but the bending elastic modulus needs to be 1500 MPa or more. is there.

  8 and 9 are views showing the production status of the pipe lining material according to the present invention. As shown in FIG. 8, the pull-in liner 3 is passed through the repair pipe 10, and one end is fixed to the hook belt 14. The reverse liner 4 is inserted into the other end of the lead-in liner 3. Water is injected into the drawing-in liner 3 with a water supply hose 13. As shown in FIG. 9, the injected water is heated by the boiler 9 and returned to the reversal liner 4 by the pump 11. The thermosetting resin is cured by the heat of hot water ejected from the hose extending to the liner end 12, and the pipe lining material 1 can be attached to the repair pipe 10.

  To manufacture the pipe lining material 1, first, the lead-in liner 3 is inserted into the repair pipe 10. Next, the drawing liner 3 is impregnated with a curable resin having a tensile elongation rate of 3% or more after curing with the resin alone, but the curable resin is impregnated into the drawing liner 3 before being inserted into the repair pipe 10. Alternatively, it may be impregnated after being inserted into the repair pipe 10. After impregnating the drawing liner 3 with a curable resin, the drawing liner 3 is attached to the inner wall of the repair pipe 10 with water pressure applied. After the drawing of the retractable liner 3 into the repair pipe 10 is completed, the reverse liner 4 is reversely inserted from the opening of the retractable liner 3 to obtain the pipe lining material 1.

  When the production of the pipe lining material 1 is completed in the repair pipe 10, air pressure or water pressure is again applied to the inside of the pipe lining material 1 and attached to the inner wall of the repair pipe 10, and steam heating, hot water or hot water is maintained while maintaining the state. The resin lining material 1 is formed in the repair pipe 10 by curing the curable resin at shower heating or at room temperature. This is the curing curing of the resin.

DESCRIPTION OF SYMBOLS 1 Pipe lining material 2 Reinforcement felt 3 Retraction liner 3a, 3b, 3c, 3d Retraction liner 4 Inversion liner 5 Resin film coating felt 6 Ribbon tape 6a Reinforcement felt ribbon tape 6b Seal ribbon tape 6c Non-woven ribbon tape 7 Resin film 8 Non-woven fabric 9 Boiler 10 Repair pipe 11 Pump 12 Liner end 13 Water supply hose 14 Hook belt

Claims (8)

This is a method for manufacturing a pipe lining material in which a resin pipe is manufactured inside a repair pipe by applying the pressure to the inner wall surface of the repair pipe by pressurizing the pipe lining material and curing the curable resin while maintaining this state. And
The curable resin has a tensile elongation rate of 3.0% or more in a single resin after being cured in a liquid state, and is impregnated in a pull-in liner and a reversal liner,
A draw-in liner with a stretch ratio of 10 to 30%, which is processed into a tubular shape by joining the end portions in the width direction of a belt-like reinforcing felt in which a woven fabric and a non-woven fabric are combined, is drawn into the repair pipe and arranged. A reverse liner made of a non-woven fabric with a stretch rate of 60% or more covered with a resin film is reversely inserted inside, and the reverse liner and the pull-in liner are pressed together, and the curable resin is stretched by 1 to 8%. A method for producing a pipe lining material, comprising curing and combining a drawing liner and a reversing liner inside a repair pipe.
2. The method for producing a pipe lining material according to claim 1, wherein the drawing-in liner is reinforced by bonding a woven fabric or a reinforcing felt ribbon tape at a joint portion at a width direction end portion of the reinforcing felt.
2. The method of manufacturing a pipe lining material according to claim 1, wherein the drawing-in liner is stitched with overlapping joint portions at width direction end portions.
The peripheral length before pressurization is set to be smaller in a range of 92 to 99% with respect to a dimension in a state where the circumference before pressurization is pressed and attached to the inner wall surface of the repair pipe. A method for producing a pipe lining material according to 1.
The circumference of the reversing liner is set to be smaller in a range of 85 to 95% with respect to a dimension in a state where the circumference before pressurization is pressurized and attached to the inner wall surface of the repair pipe. A method for producing a pipe lining material according to 1.
2. The method for producing a pipe lining material according to claim 1, wherein an outer surface of the drawing-in liner is covered with a resin film or a resin film coating felt.
The pipe lining material manufacturing method according to claim 1, wherein the lead-in liner is inserted into a repair pipe after impregnating the curable resin.
  The method for manufacturing a pipe lining material according to claim 1, wherein the drawing-in liner is impregnated with a curable resin after being inserted into a repair pipe.

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