JP5860674B2 - Lining material - Google Patents

Description

  The present invention relates to a lining material that is applied to the inner surface of an existing pipe for rehabilitation.

  When existing pipes such as sewer pipes, water pipes, and agricultural water pipes buried in the ground are aged, existing pipes are repaired by lining the inner surface of the pipe without excavating the pipe. Various rehabilitation methods have been proposed.

  As one of the rehabilitation methods, fluid pressure is applied to the inside of the tubular lining material, or the pressure hose is inverted and inserted by the fluid pressure, and the lining material is pressed against the inner peripheral surface of the pipeline and cured. There is a method of forming a lining layer by integrating them. Further, there is a method in which the lining material itself is inserted into the pipeline while being inverted, pressed against the inner peripheral surface of the pipeline by fluid pressure, and cured to be integrated. Such a rehabilitation method using a lining material can repair a buried pipeline without excavating the ground.

  As a lining material used in this type of rehabilitation method, for example, Patent Document 1 discloses a tubular lining material in which a tubular resin-absorbing base material whose outer surface is coated with a resin film material is impregnated with a liquid thermosetting resin. Is described. The tubular lining material is fixed to the inner peripheral surface of the pipe by curing the impregnating resin while being pressed against the inner peripheral surface of the pipe.

  In the above construction method, the tubular lining material is folded in a flat shape and deployed in a state of being stacked in a closed container. And the said tubular lining material is attached to the opening end outer periphery of the inversion nozzle connected to the airtight container, water pressure is made to act in an airtight container, and it is set as the structure which reversely inserts a tubular lining material in a pipe line. As a result, the expanded lining material is such that the resin-absorbing base material comes into close contact with the inner peripheral surface of the pipe line in the pipe line to line the pipe line.

JP 2003-165158 A

  In the rehabilitation method using such a lining material, a method of increasing the thickness of the resin-absorbing base material in the lining material can be considered to increase the strength of the rehabilitated pipeline. However, when the thickness of the resin-absorbing base material is simply increased, there is a problem that the liquid base resin is difficult to be uniformly impregnated, an unimpregnated portion (void) is formed, and the quality is difficult to stabilize. In addition, if it is attempted to impregnate over time so as not to generate an unimpregnated portion, the liquid base resin has a short pot life, resulting in thickening during impregnation and reversal operations, resulting in an unimpregnated portion. Or inconvenience that it becomes impossible to cope with inversion.

  Moreover, in order to raise the intensity | strength of a rehabilitation pipe line, the method of reinforcing a lining material with reinforcing fiber materials, such as glass fiber, can also be considered. However, since the lining material is inserted into the pipeline and constructed, it is formed to have a diameter slightly smaller than the inner diameter of the pipeline, and is expanded after being inserted into the pipeline and is crimped to the inner peripheral surface. At this time, when the lining material is reinforced with the reinforcing fiber material, the reinforcing fiber has almost no stretchability, and thus there is a problem that the diameter expansion property of the lining material is hindered.

  The present invention has been made in view of the conventional problems as described above, and includes a reinforcing fiber to ensure high strength against tensile force and compressive force, and at the time of lining work to an existing pipe. The present invention intends to provide a lining material having a sufficient diameter expansion property to be in close contact with the inner peripheral surface of the steel and having good workability.

In order to achieve the above object, the solution means of the present invention is formed in a cylindrical shape having an outer diameter smaller than the inner diameter of the existing pipe, inserted and expanded in the existing pipe, and lining the inner peripheral surface of the existing pipe. A layered lining material is assumed. The lining material is provided with a resin-impregnated layer impregnated with a base resin mainly composed of a liquid thermosetting resin and a coating layer made of an impermeable material. The resin-impregnated layer is provided with a multilayered resin nonwoven fabric and a sheet-like reinforcing material made of a reinforcing fiber material interposed between these resin nonwoven fabrics, and the reinforcing material of the resin-impregnated layer includes: have a total width greater than the inner peripheral length of the existing pipe singular or plural, overlapping state ends in the width direction of the reinforcing material is each other become heavy between the resin nonwoven fabric and a resin nonwoven fabric parts shall be the substantially cylindrical body provided with. And the overlap part of the said reinforcing material is provided with the junction part joined by the hot melt adhesive which has polyester-type resin as a main component, and this reinforcement material is heated or expanded in diameter to the said junction part . Ru allowed with the property of releasing the joining of the overlap portion.

  Because of this specific matter, the reinforcing fiber material contained in the resin-impregnated layer is configured with a sheet-like reinforcing material substantially normal, so when expanding the diameter of the lining material in the existing pipe, the width of the sheet-like reinforcing material is increased. The end portions can be shifted from each other to follow the diameter expansion. In addition, such a sheet-like reinforcing material is arranged so as to form an overlap portion, and the overlap portion is joined by a joining means. It is possible to substantially maintain the arrangement form during the insertion operation until reaching the time of heating and diameter expansion. As a result, when the lining material is heated and expanded in diameter, the resin-impregnated layer containing the reinforcing material is sufficiently expanded in diameter, and after the expansion, the reinforcing material can be evenly arranged in the resin-impregnated layer. In addition, by joining the sheet-shaped reinforcing material, it is possible to prevent each reinforcing material from being twisted or folded and to ensure a uniform thickness, so that the lining material has high pressure resistance performance and strength. It becomes possible to prepare.

In the lining material, a hot melt adhesive mainly composed of a polyester resin is used to transfer a plurality of reinforcing materials to each other when transporting in a specific external force or in a non-heated state, or during insertion / retraction into a pipeline. In addition to fixing, at the time of heating or pressurizing the lining material, the fixing is released by a heating action.

Here, when the resin-impregnated layer impregnated with the base material resin is heated in the existing pipe, the heat transmitted to the reinforcing material acts on the overlap portion to soften or destroy the hot melt adhesive , Release the overlap of the reinforcing material overlap . Also, due to the heat generated during the curing reaction of the thermosetting resin, the temperature of the base resin rises, softening or destroying the hot melt adhesive and releasing the joining of the overlap portion of the reinforcing material . As a result, it becomes possible to allow the sheet-like reinforcing materials to shift from each other at the overlap portion, and to follow the diameter expansion of the resin-impregnated layer. As a result, the lining layer can be sufficiently expanded in diameter and is in close contact with the inner peripheral surface of the existing pipe.

  In the lining material, it is preferable that the resin-impregnated layer includes a plurality of sheet-like reinforcing materials and the overlap portions are arranged uniformly in the circumferential direction. Furthermore, it is preferable that the overlap portions are arranged to face each other.

  With such a configuration, the diameter of the lining material can be sufficiently expanded or expanded in the lining operation process, and the strength of the lining material after curing can be ensured uniformly as a whole.

  According to the lining material of the present invention as described above, the existing pipe is formed without damaging the diameter expansion necessary for the lining construction, although it includes a reinforcing fiber for securing high strength against tensile force and compressive force. It is possible to follow the inner peripheral surface shape by closely contacting.

FIG. 1 is a cross-sectional view showing an example of a lining material according to the present invention. FIG. 2 is a cross-sectional view showing the lining material in a state of being inverted and inserted into an existing pipe. FIG. 3 is a cross-sectional view showing the lining material in a state where an existing pipe is covered. FIG. 4 is an explanatory view showing a lining material reversal process according to the present invention. FIG. 5 is an explanatory view showing a heating diameter expansion process of the lining material according to the present invention. FIG. 6 is a cross-sectional view illustrating the lining material according to the first embodiment. FIG. 7 is a cross-sectional view showing the lining material according to Embodiment 1 in a state of being inverted and inserted into an existing pipe. FIG. 8 is a cross-sectional view showing the lining material according to Embodiment 1 in a state in which an existing pipe is covered. FIG. 9 is a partial cross-sectional view illustrating a state of the lining material rehabilitation process according to the first embodiment. FIG. 10 is a partial cross-sectional view showing a state of each lining material rehabilitation process according to the second embodiment. FIG. 11 is a partial cross-sectional view showing a lining material as a comparative example.

  Hereinafter, embodiments of a lining material according to the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing an example of a lining material, FIG. 2 is a cross-sectional view showing a lining material in a state of being inverted and inserted into an existing pipe, and FIG. 3 is a cross-section showing an existing pipe covered with the lining material. FIG. FIG. 4 is an explanatory view showing the lining material reversal process of FIG. 1, and FIG. 5 is an explanatory view showing the heating diameter expansion process of the lining material according to the present invention.

  Prior to the description of the lining material according to the embodiment, first, the schematic configuration of the lining material and the existing pipe rehabilitation method performed using the lining material will be described.

(Lining material)
The lining material 1 forms a lining layer on the inner peripheral surface of the existing pipe 4 to be repaired, and is formed in a cylindrical shape having an outer diameter smaller than the inner diameter of the existing pipe 4 in advance. The lining material 1 has a multilayer structure including a coating layer 2 and a resin impregnated layer 3.

  In the illustrated form, the lining material 1 has a coating layer 2 on the outermost side. The covering layer 2 is formed in a cylindrical shape from a synthetic resin film material that is impermeable to pressurized fluid. Specifically, the coating layer 2 is formed of a polyethylene film, a polyurethane film, a soft vinyl chloride resin film, or the like. Among these, a polyethylene film material having a thickness of about 0.2 to 2.0 mm is suitable for the coating layer 2. In addition, the coating layer 2 can be formed using a resin film material such as polypropylene, nylon, polyester, or polyvinyl chloride, or a sheet material made of an elastomer or a synthetic rubber material.

  Inside the covering layer 2 of the lining material 1, a resin impregnated layer 3 is provided over a single layer or multiple layers. In FIG. 1, the resin impregnated layer 3 includes resin nonwoven fabrics 31 and 31 stacked in two layers, and a reinforcing fiber layer 32 interposed between the resin nonwoven fabrics 31. The resin nonwoven fabric 31 is a base material that is impregnated with a base resin mainly composed of a liquid thermosetting resin, and is made of a material having flexibility and excellent resin impregnation properties.

  As the resin nonwoven fabric 31, in addition to the polyester nonwoven fabric, a nonwoven fabric made of a high-strength, high-elastic material such as high-performance polyethylene (HPPE) or polypropylene can be used. Further, the resin nonwoven fabric 31 may be formed of felt, mat, spunbond, web, or the like including continuous filaments or staple fibers as long as it is a flexible and porous material. For example, when the resin nonwoven fabric 31 is formed by a chopped strand mat, strands such as glass fibers are cut into a predetermined length and dispersed in a mat shape, and then an adhesive such as a thermoplastic resin is uniformly applied. It is preferable to use a material which is melted and bonded to each other to form a mat.

  The reinforcing fiber layer 32 interposed in the resin impregnated layer 3 is made of a reinforcing fiber material such as glass fiber, aramid fiber, or carbon fiber. Of these, glass fibers are preferred in view of the strength and price of the resulting fiber-reinforced resin molded product. In addition, the reinforcing fiber material used for the reinforcing fiber layer 32 is preferably pretreated with a silane coupling agent in order to enhance the adhesiveness with the base material resin.

  In the illustrated embodiment, the reinforcing fiber layer 32 is formed by arranging two sheet-like reinforcing members 321 and 321 so as to form a cylindrical shape. As the reinforcing material 321, a sheet material is used in which the total width of the two sheets is longer than the inner peripheral length of the existing pipe 4. That is, when the reinforcing fiber layer 32 is constituted by a plurality of reinforcing members 321, the total width dimension of the plurality of reinforcing members 321 is preferably set to be longer than the inner diameter of the existing pipe 4.

  As shown in FIG. 1, the reinforcing members 321 are arranged so that the end portions in the width direction are overlapped with other adjacent reinforcing members 321 by a certain width and overlap each other in the circumferential direction of the lining material 1. Has been. Thereby, the overlap part W is formed in two places of the reinforcing fiber layer 32.

  The two overlapping portions W are preferably formed at positions facing each other in the circumferential direction of the lining material 1. Moreover, when the overlap part W is provided in three or more places, it is preferable to arrange | position equally in the circumferential direction. By arranging the overlap portions W evenly in the lining material 1, a substantially uniform thickness can be secured as the lining material 1.

  In the lining material 1, the overlap portion W is joined by a joining means including a thermoplastic resin. The joining form of the overlap portion W will be described in Embodiments 1 and 2 described later.

  The resin impregnated layer 3 is inverted and inserted into the existing pipe 4 as shown in FIG. 2 in the rehabilitation process of the existing pipe 4, and is impregnated with an uncured base material resin. Thereafter, as shown in FIG. 3, the lining material 1 is cured in the existing pipe 4 to form a lining layer. The base resin is mainly a thermosetting resin, and among them, an epoxy resin mixture having an epoxy resin as a main component, which has a relatively low viscosity, excellent physical properties after curing, and low cost. Moreover, as a main ingredient of the base material resin, a thermosetting resin such as an unsaturated polyester resin, a vinyl ester resin, or a melamine resin may be used.

  In addition, as an epoxy-type main ingredient, a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, etc. can be used suitably. This type of epoxy-based main agent has a very high viscosity, and usually has a viscosity of 20000 mPa · s or higher under a low temperature condition of 10 ° C. or lower. Therefore, it is preferable to lower the viscosity of the epoxy base agent by adding a diluent or selectively adding a low viscosity curing agent. The diluent is not particularly limited as long as it can lower the viscosity of the epoxy base agent, and may be a reactive diluent or a non-reactive diluent. Further, both may be used in combination.

  Examples of the reactive diluent include monophenols such as phenol, cresol, ethylphenol, propylphenol, p-tert-butylphenol, p-tert-amylphenol, hexylphenol, octylphenol, nonylphenol, dodecylphenol, octadecylphenol and terpenephenol. Examples thereof include those having a glycidyl ether group at the terminal, such as glycidyl ether. Examples of the non-reactive diluent include dioctyl phthalate, dibutyl phthalate, and benzyl alcohol. Furthermore, at least one selected from these diluents can be used alone or in combination.

  Although it does not specifically limit as a low viscosity hardening | curing agent, The thing which can reduce the viscosity of an epoxy-type main ingredient, can ensure a moderate hardening rate, and also does not elute after hardening is preferable. Examples of the curing agent having such properties include amine-based curing agents such as aliphatic polyamines, aromatic polyamines, and alicyclic polyamici. Among them, an aliphatic polyamine having a very low viscosity, excellent physical properties after curing, and inexpensive is preferably used. Specific examples of the aliphatic polyamine include polyoxypropylenediamine, trimethylolpropane poly (oxypropylene) triamine, metaxylenediamine, 1,3-bis (aminomethyl) cyclohexane, and modified products thereof. . In addition, at least one selected from these curing agents can be used alone or in combination.

  The resin-impregnated layer 3 can also have a single-layer structure, and the resin-impregnated layer 3 having a single-layer structure can be obtained by forming a fibrous body such as a resin nonwoven fabric or glass fiber into a cylindrical shape. Moreover, in the lining material 1 of FIG. 1, although the example which provided the reinforced fiber layer 32 which consists of a reinforced fiber material between the resin nonwoven fabrics 31 and 31 formed in the cylinder shape as the resin impregnation layer 3 was shown, resin impregnation was shown. The layer 3 can have various other forms. For example, in the resin impregnated layer 3 of the lining material 1 shown in FIG. 1, an example in which two sheet-like reinforcing materials 321 are arranged is shown, but the present invention is not limited to this, and a plurality of three or more sheets are provided. The reinforcing material 321 may be provided, or a single sheet-like reinforcing material 321 may be provided in a cylindrical shape. Further, the lining material 1 may have a configuration in which the resin impregnated layer 3 is provided on the outer layer and the coating layer 2 is provided on the inner layer.

(Rehabilitation method for existing pipe)
Next, the rehabilitation method for the existing pipe 4 using the multi-layered lining material 1 configured as described above will be described with reference to FIGS. 4 and 5.

  Prior to the rehabilitation work of the existing pipe 4, when there is a fluid such as sewage in the existing pipe 4, it is preferable to perform a water draining work to remove the existing pipe 4 once. As shown in FIG. 4, manholes M1 and M2 are provided at appropriate intervals in the pipe line of the existing pipe 4, and the damming members 5 are provided in the manholes M1 and M2 on the upstream side and the downstream side of the rehabilitation target range. Provide. The sewage fluid, which has been dammed, bypasses the ground from a manhole (not shown) further upstream and is discharged to the downstream pipeline in the rehabilitation target range. Further, it is preferable to remove foreign matter such as deposits and wood chips existing in the existing pipe 4 and perform high-pressure water cleaning.

  Since the lining material 1 is a cylindrical body having flexibility, when the existing pipe 4 is rehabilitated, it can be carried into the construction site in a compact state folded in a flat shape. The lining material 1 is impregnated with a base material resin with respect to the resin impregnated layer 3. Specifically, the inside of the coating layer 2 of the lining material 1 shown in FIG. 1 is decompressed and the resin-impregnated layer 3 is degassed, and an uncured base resin is injected into the coating layer 2. Thereby, the base material resin can be impregnated in the resin impregnated layer 3. The gap between the fibers of the resin nonwoven fabric 31 and the reinforcing material 321 acts as a degassing path and also acts as a flow path for the uncured base resin.

  Next, the lining material 1 is inserted into the existing pipe 4 while being reversed. As shown in FIG. 4, the lining material 1 is attached to the reverse insertion machine 6 installed on the ground, and fluid pressure such as compressed air or heated water is applied from the outer peripheral side (the coating layer 2 side) of the lining material 1. The lining material 1 passes through the manhole M1 and advances into the existing pipe 4 while being reversed (reversing method). Thus, the lining material 1 is sequentially inserted into the existing pipe 4 while turning over so that the coating layer 2 is inside (see FIG. 2). In addition, as shown in FIG. 2, it is preferable that the overlap part W of the lining material 1 is arrange | positioned at the inner side part on either side with respect to a pipe cross section. As a result, the reinforcing material 321 is evenly disposed on the upper side and the lower side of the lining material 1, and sufficient proof stress can be exerted on the vertical load acting on the existing pipe 4.

  Next, the inverted lining material 1 is expanded in diameter by the action of fluid pressure such as steam in the existing pipe 4, and the resin impregnated layer 3 is in close contact with the inner wall of the existing pipe 4 (see FIG. 3). The lining material 1 is integrated with the existing pipe 4 when the base material resin impregnated in the resin-impregnated layer 3 is cured to form a lining layer. The lining layer is covered with the covering layer 2 and forms a smooth inner peripheral surface in the existing pipe 4. The lining material 1 is formed by forming the outer diameter of the lining material 1 to be smaller than the inner diameter of the existing pipe 4 by the reinforcing fiber layer 32 having the overlap portion W, and can be easily inserted into the existing pipe 4. In addition, the diameter can be increased inside the existing pipe 4.

  The lining material 1 for rehabilitating the existing pipe 4 is not limited to the layer structure illustrated in FIG. 1 having the coating layer 2 in the outer layer and the resin impregnated layer 3 in the inner layer. For example, the lining material 1 may have a layer configuration in which the coating layer 2 is formed as an inner layer from the beginning, and the resin impregnated layer 3 is provided outside the coating layer 2. That is, in this case, the lining material 1 has a laminated form in which the inner peripheral side and the outer peripheral side are reverse to those in FIG. If it is such a lining material 1, after inserting in the existing pipe 4 without being inverted, the diameter is expanded and the procedure which forms a lining layer in the inner wall of the existing pipe 4 is employ | adopted (formation construction method).

  Specifically, the resin impregnated layer 3 is impregnated with the base material resin by immersing the lining material 1 in a container filled with the base material resin. Next, closing members 71 are attached to both ends of the lining material 1 and are drawn into the existing pipe 4 using the manholes M1 and M2. As shown in FIG. 5, pressure flow pressure such as steam introduced from the above-described boiler unit 7 acts on the inside of the lining material 1, and the diameter is expanded in the existing pipe 4. The lining material 1 is in close contact with the expanded resin impregnated layer 3 pressed against the inner wall of the existing pipe 4. In the lining material 1, the base material resin impregnated in the resin impregnated layer 3 is cured by heating. Thereby, as shown in FIG. 3, the lining material 1 is integrated with the existing pipe 4 to form a lining layer. The existing pipe 4 is covered with the coating layer 2, and a smooth inner peripheral surface is formed in the existing pipe 4.

  The lining material 1 is a state in which the inner peripheral surface of the lining layer (that is, the inner surface of the renovated existing pipe 4) is covered with the coating layer 2 even when the lining material 1 is constructed by any of the reversal method or the forming method. Thus, a protective layer having excellent surface smoothness and high water resistance and chemical resistance is obtained.

<Embodiment 1>
Next, the lining material according to Embodiment 1 will be described. 6 is a cross-sectional view showing the lining material according to the first embodiment, FIG. 7 is a cross-sectional view showing the lining material in a state of being inverted and inserted into the existing pipe, and FIG. 8 is a lining material covered with the lining material. It is sectional drawing which shows the existing pipe | tube of a state. Moreover, Fig.9 (a)-FIG.9 (d) show a part of lining material which concerns on Embodiment 1, and are the fragmentary sectional views which showed the state of the lining material in the rehabilitation process of the existing pipe in steps. .

  In FIG. 9 and FIGS. 10 and 11 to be described later, for simplicity, the base resin impregnated in the resin impregnated layer 3 is omitted, and the cross-sectional structure of the lining material 1 is schematically illustrated.

  In the first embodiment, a lining material 1 having a coating layer 2 as an outer layer and a resin-impregnated layer 3 as an inner layer will be described, and an example in which the lining material 1 is constructed in an existing pipe 4 by a reversal method will be described. .

  As shown in FIG. 6, in the lining material 1, the reinforcing fiber layer 32 is interposed in the resin impregnated layer 3. In the reinforcing fiber layer 32, one sheet-like reinforcing material 321 is arranged in a substantially cylindrical shape by overlapping end portions in the width direction. Both end portions overlapped in the circumferential direction form an overlap portion W. The width dimension of one reinforcing member 321 is set longer than the inner peripheral length of the existing pipe 4. Accordingly, even after the diameter of the lining material 1 is increased, the reinforcing fiber layer 32 can keep the reinforcing material 321 overlapped, and the reinforcing material 321 can be arranged without being interrupted in the circumferential direction.

  The lining material 1 is inserted into the existing pipe 4 while being inverted (inversion method). Accordingly, as shown in FIG. 7, the lining material 1 is sequentially inserted into the existing pipe 4 while turning over so that the coating layer 2 is inside. The inverted lining material 1 is expanded in diameter by the action of fluid pressure such as steam in the existing pipe 4, and the resin impregnated layer 3 comes into close contact with the inner wall of the existing pipe 4 as shown in FIG. 8.

  Here, the state of the lining material 1 at each stage of the rehabilitation process of the existing pipe 4 will be described. As shown in FIG. 9A, the lining material 1 is sequentially covered from the outer peripheral side before reversal as shown in FIG. And the resin impregnated layer 3 are laminated, and the resin impregnated layer 3 is constituted by laminating a resin nonwoven fabric 31, a reinforcing fiber layer 32, and a resin nonwoven fabric 31 in order.

For example, a polyethylene film material having a thickness of about 0.7 mm can be used for the covering layer 2. As the resin nonwoven fabric 31, a nonwoven fabric having a thickness of about 1 mm made of polyethylene terephthalate (PET) fibers can be used. For the reinforcing material 321 of the reinforcing fiber layer 32, a glass cloth having a basis weight of 1500 g / m ² made of an E glass composition can be used.

  The resin-impregnated layer 3 may have a configuration in which different types and thicknesses of resin nonwoven fabrics 31 are laminated on the outer peripheral side and the inner peripheral side. For example, in addition to the nonwoven fabric, a polyester resin nonwoven fabric having a thickness of about 3 mm may also be used. Can be used.

  The overlap portion W of the reinforcing fiber layer 32 is joined by a joining means 33 containing a thermoplastic resin. Thereby, the reinforcing fiber layer 32 is formed in a cylindrical shape as a whole.

  As for the lining material 1 which concerns on Embodiment 1, the overlap part W is joined by the joining means. In the illustrated embodiment, the overlap portion W is joined using a hot melt adhesive mainly composed of a thermoplastic resin material as the joining means 33. As an example of the hot melt adhesive, an adhesive mainly composed of ethylene vinyl acetate copolymer resin (EVA) which is excellent in all of flexibility, adhesiveness, thermal stability and the like is preferable. In addition, hot-melt adhesives such as polyurethane, polyamide, polyester, olefin, and synthetic rubber can also be suitably used.

  Since the joining means 33 is a hot melt adhesive, there is no possibility that bubbles will be generated in the overlap portion W during joining, and there is a possibility that cracks, voids, etc. may occur during heating and expansion due to the reheat processability of the hot melt adhesive. Absent.

  In the form shown in FIG. 9A, the hot melt adhesive is applied in a planar shape and joined to the entire width of the overlap portion W at the end of the reinforcing material 321. The hot melt adhesive can be easily applied with, for example, a hot melt gun or a spray device.

  Further, a sheet-like hot melt adhesive may be used for the overlap portion W. As the hot melt adhesive, the above-described application type (reactive hot melt) and the web type (hot melt web) are known. The hot-melt web is a large number of fibrous hot-melt adhesives made of a thermoplastic resin material such as nylon-based or polyester-based resin, and is configured in a net shape so that it has air permeability and is lightweight. Therefore, when the base material resin is impregnated in the resin impregnated layer 3, it can be suitably used for the lining material 1 without hindering the flow of the uncured base material resin.

  Joining of the overlap part W is performed by supplying hot air to the overlap part W and pressing it with a roller or the like while heating. Alternatively, the hot melt tape material may be sandwiched between the overlapped portions W, and a heating means such as an iron may be applied, or hot air may be supplied and heated to bond the overlapped portions W.

  Even if the inner peripheral side and the outer peripheral side are reversed at the time of construction of the lining material 1 on the existing pipe as shown in FIG. Keep it stable. At this time, since the overlap portion W is joined by the hot melt adhesive (joining means 33) containing the thermoplastic resin, the lining material 1 is pressurized by the heating fluid and expanded in diameter by the pressurized fluid. In this state, the joint can be released, that is, it is temporarily stopped.

  That is, in the rehabilitation process of the existing pipe 4, when the lining material 1 is heated, the joining means 33 is softened or broken due to the heat applied to the lining material 1 and the heat generated by the curing reaction of the base material resin. . Thereby, the cylindrical reinforcing fiber layer 32 is separated into individual sheet-like reinforcing members 321. Furthermore, when the diameter of the lining material 1 is increased, the reinforcing fiber layer 32 is also pressed in the radial direction, and the sheet-like reinforcing material 321 is shifted in the circumferential direction as shown in FIG. 9C. As a result, the diameter of the lining material 1 is sufficiently expanded, and after heating, as shown in FIG. 9D, the lining material 1 can be cured into a shape along the inner peripheral surface of the pipe.

  On the other hand, FIGS. 11A to 11D shown as comparative examples show the case where the reinforcing material 132 of the reinforcing fiber layer is formed as the lining material 10 without being joined. As shown to Fig.11 (a), before the lining material 10 inversion, the edge part of the adjacent reinforcement material 132 has overlapped by the fixed width | variety. On the other hand, as shown in FIG. 11 (b), when the lining material 10 is reversed, the ends of the reinforcing members 132 that are not joined are displaced from each other, causing a problem that they are twisted or folded. Such a problem may occur before the lining material 10 is reversed, for example, when the resin-impregnated layer 131 is manufactured or when the lining material 10 is stored and carried in.

  Thereafter, when the lining material 10 is heated and expanded in diameter as shown in FIG. 11C, the reinforcing material 132 is displaced in the circumferential direction to allow the lining material 10 to expand in diameter. However, as shown in FIG. 11 (d), the reinforcing material 132 is maintained in a state where it is drowned even after the lining material 10 is heated. When the curing reaction of the base material resin proceeds in such a state, a non-uniform portion is formed in the arrangement form of the reinforcing material 132 inside the coating layer 12, and it becomes a factor of stress concentration after curing. It becomes difficult to ensure strength performance.

  Therefore, since the lining material 1 according to the present embodiment has the overlap portion W joined by the joining means 33, such a problem can be avoided, and the reinforcing fiber after the diameter expansion in the lining material 1 can be avoided. Arrangement can be made uniform, and high pressure resistance and proper strength can be ensured.

<Embodiment 2>
Next, the lining material which concerns on Embodiment 2 is demonstrated. FIG. 10A to FIG. 10D are partial cross-sectional views showing the lining material according to the second embodiment and showing the state of the lining material in the process of rehabilitating existing pipes in stages.

  In the lining material according to this embodiment, the configuration of the lining material 1 according to the first embodiment is different from the configuration of the joining means, and the basic configuration of the lining material is common. Therefore, in the description of the second embodiment, the joining means will be mainly described, and the description common to the first embodiment will be omitted by using the common reference numerals.

  In the lining material 1 according to the second embodiment, the joining means 33 is linearly provided in the overlap portion W. As illustrated in FIG. 10A, the joining means 33 is linearly provided along each end portion (side edge portion in the width direction) of the plurality of sheet-like reinforcing members 321. Thereby, the reinforcing material 321 which comprises the reinforced fiber layer 32 is mutually joined in the overlap part W, and it is set as the shape which makes a cylinder shape as a whole.

As the joining means 33, a hot melt adhesive mainly composed of the same thermoplastic resin material as that of the first embodiment can be used. In this case, with respect to the ends of the reinforcing member 321, the hot-melt adhesive using a hot melt gun is Ru discharged linearly.

  As shown in FIG. 10B, the overlapped portion W joined by the joining means 33 is stably maintained even when the lining material 1 is reversed.

  Next, when the lining material 1 is heated, the joining means 33 is softened or broken due to heat applied to the lining material 1 and heat generated by the curing reaction of the base material resin. As a result, as shown in FIG. 10C, the reinforcing fiber layer 32 is separated into individual sheet-like reinforcing materials 321 and the diameter of the lining material 1 is increased, so that these reinforcing materials 321 are surrounded by each other. It will shift in the direction. As a result, the diameter of the lining material 1 is sufficiently expanded, and after heating, as shown in FIG. 10 (d), it is possible to cure with a uniform thickness along the inner peripheral surface of the pipe.

  The lining material 1 configured as described above has elasticity, flexibility, and flexibility that can follow the shape of the inner peripheral surface of the existing pipe 4. Furthermore, since the outer diameter of the lining material 1 can be formed with a smaller diameter than the inner diameter of the existing pipe 4, insertion into the existing pipe 4 is facilitated. In addition, the lining material 1 includes a reinforcing fiber layer 32, can ensure strength, and can be expanded in the existing pipe 4.

  In particular, the reinforcing fiber layer 32 in the lining material 1 has a plurality of sheet-like reinforcing materials 321 arranged evenly, and the reinforcing materials 321 are joined together by a joining means. Thereby, the arrangement of the reinforcing material 321 of the reinforcing fiber layer 32 is not biased during the lining construction process, and the entire diameter can be sufficiently expanded following the diameter expansion of the lining material 1. Therefore, the shape of the lining material 1 can be made to follow the unevenness and level difference of the inner peripheral surface of the existing pipe 4, the reinforcing fibers after the diameter expansion can be arranged uniformly, and high pressure resistance performance and appropriate Strength can be secured.

  INDUSTRIAL APPLICATION This invention can be utilized suitably for the lining material used for the rehabilitation of the existing pipe | tube which has deteriorated or needed repair.

DESCRIPTION OF SYMBOLS 1 Lining material 2 Coating layer 3 Resin impregnation layer 31 Resin nonwoven fabric 32 Reinforcement fiber layer 321 Reinforcement material 33 Joining means W Overlap part 4 Existing pipe 5 Damping member 6 Reverse insertion machine 7 Boiler unit

Claims (3)

It is formed into a cylindrical shape having an outer diameter smaller than the inner diameter of the existing pipe, is inserted and expanded in the existing pipe, and is a lining material having a multilayer structure that lines the inner peripheral surface of the existing pipe,
A resin-impregnated layer impregnated with a base resin composed mainly of a liquid thermosetting resin, and a coating layer made of an impermeable material;
The resin impregnated layer includes a multilayer resin nonwoven fabric and a sheet-like reinforcing material made of a reinforcing fiber material interposed between these resin nonwoven fabrics,
The reinforcing material in the resin-impregnated layer is a single or plural reinforcing material having a total width dimension longer than the inner peripheral length of the existing pipe, and the widthwise end of the reinforcing material between the resin nonwoven fabric and the resin nonwoven fabric. parts to each other is a substantially cylindrical body having an overlap portion where each other become heavy,
The overlap portion of the reinforcing material includes a joint portion joined by a hot melt adhesive mainly composed of a polyester-based resin, and the joint portion is formed by heating or expanding the diameter of the reinforcing material . A lining material characterized by having a property of releasing bonding. The lining material according to claim 1,
The resin impregnated layer includes a plurality of sheet-like reinforcing materials,
The overlapping portion lining material, characterized by comprising evenly spaced in the circumferential direction. In the lining material according to claim 2,
The overlapping portion lining material, characterized in that formed by opposed.

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