JP5599043B2 - Lined lining material and laminated material for lining material - Google Patents

Description

  The present invention relates to a lining material for lining an existing pipe line for repair or reinforcement, and a laminated member for the lining material, and in particular, a pipe while reversing the inner and outer surfaces of the lining material by fluid pressure. The present invention relates to a lining material and a lining material laminated member suitable for lining by a reverse lining method in which a lined lining material is inserted into a passage and pressed against the inner surface of a pipe line by the fluid pressure.

  Generally, the lining material of a pipe line is pressed against the inner surface of an existing pipe line in a state of being impregnated with a large amount of a reaction curable resin liquid, and the damaged part of the existing pipe line is repaired by curing the reaction curable resin liquid. At the same time, a strong pipe is formed inside the pipe. During the work of the lining, the lining material needs to be held in a state of being impregnated with the reaction curable resin liquid, and thus requires a thick fiber layer.

  On the other hand, the lining material 1 does not require excessively high strength, and a non-woven fabric is used to facilitate impregnation with the reactive curable resin liquid as described above. Further, in order to facilitate the penetration of the reaction curable resin liquid into the inside thereof while securing the thickness, a plurality of laminated members 2 made of the nonwoven fabric are often used as shown in FIG.

  However, in order to perform lining by the reverse lining method as described above, the lining material 1 needs to be manufactured so that the inner surface and the outer surface are opposite to the lining state. In the case of the lining material 1 in which a plurality of laminated members 2 are overlapped, in the lining state, as shown in FIG. 2, the diameter of the outermost layer 2c in the lining state becomes larger and the diameter becomes smaller as the inner layer 2b and the inner layer 2a. Nevertheless, when the lining material 1 is manufactured, the outermost layer 2c in the lining state is located on the innermost side, so the diameter must be reduced, and the diameters of the layers 2a to 2c are opposite to the lining state.

  If a large-diameter layer is provided on the inner side and the diameter is reduced toward the outer side, it matches the lining state. However, if this is done, the large-diameter layer is positioned inside the small-diameter layer, so the inner layer Wrinkles occur and the reaction curable resin liquid cannot be impregnated uniformly.

  Therefore, as the lining material, it is necessary that the diameter of each layer can be slightly changed so that the diameter of each layer can be reversed between the production and the lining. It is required to be.

  Conventionally, in a lining material, in order to expand the lining material inserted into the pipe line with an internal pressure so as to be along the inner surface of the pipe line, it is required that the diameter can be expanded. For example, Japanese Patent Application Laid-Open No. 2008-180254 discloses a lining material using skewed yarns crossing in opposite directions. In this case, although there is flexibility in diameter, the lining material is reinforced by the inner pressure during lining. Since the length of the lining material is shortened when the diameter is expanded, in the lining material in which a plurality of layers as described above are laminated, the amount of variation in diameter differs for each layer. Will fluctuate and cannot be applied.

  In general, when a fiber member is impregnated with a reaction curable resin solution and cured to form FRP, a glass fiber having high strength is used as the fiber member, and this is impregnated with a resin solution such as unsaturated polyester or epoxy. Often used.

  However, it is difficult to use glass fiber as a fiber member in a lining material that requires the above properties. The roving cloth using long glass fibers cannot ensure the flexibility of diameter because the elongation of the glass fibers is extremely small, and the chopped strand mat made of short glass fibers has almost no short fiber entanglement. Therefore, when the reaction curable resin liquid is in an uncured state, the strength is extremely inferior.

  In the lining material of the pipe line, since sufficient strength is required in the lining state, it is preferable to use glass fiber. However, as described above, flexibility of the diameter is required, and a certain amount of lining work is required. Due to the demand for strength, it was practically impossible to use glass fibers as the fiber layer of the lining material.

  In addition, since glass fiber is an inorganic fiber, it cannot always be said that the affinity for resin liquids such as unsaturated polyester and epoxy as described above is good, and the fiber layer consisting only of glass fibers is quickly impregnated with the resin liquid. There has been a demand for a fiber member that is easily impregnated with these resin liquids.

JP 2008-180254 A

  The present invention has been made in view of such circumstances, is a lining material mainly composed of glass fiber, has a strength sufficient to withstand the lining work, and can ensure flexibility in diameter, It is an object of the present invention to provide a structure of a lining material that is easily impregnated with a resin liquid and a laminated member for forming the lining material.

The laminated member of the present invention is characterized in that a chopped strand mat of glass fibers having a fiber length of 30 to 70 mm and a spunbond nonwoven fabric of organic fibers are superposed and joined by needle punching. In the laminated member of the present invention, it is preferable that the chopped strand mat and the spunbond nonwoven fabric are alternately overlapped, and the spunbond nonwoven fabric is located on both surfaces.

Further, the lining material of the present invention is characterized in that the above-mentioned laminated member is rolled into a cylindrical shape, a plurality of the cylindrical laminated members are laminated, and a flexible airtight tube is arranged at the outermost part. . In this lining material, lamination member adjacent to and out is preferably equal to the inner diameter of the outer diameter and the outer lamination members inside the lamination members.

  According to the present invention, since the organic fiber spunbond nonwoven fabric has a considerable degree of strength, the strength of the spunbond nonwoven fabric can bear the load in the lining operation, and is made of organic fibers and has individual strength. Since the direction of the fibers is not constant, it has extensibility, and it is possible to ensure the flexibility of the diameter of the lining material.

  The chopped strand mat superposed on the spunbond nonwoven fabric can be impregnated with a large amount of the reaction curable resin liquid depending on the thickness thereof, and the short fibers can be easily formed when the reaction curable resin liquid is uncured. Since the displacement does not hinder the flexibility of the diameter of the lining material, and after the reaction curable resin liquid is cured, a strong FRP is formed by the reaction curable resin liquid and the glass fiber, and the pipe line A strong lining can be formed on the inside.

Cross-sectional view of the lining material of the present invention Cross-sectional view of a state in which the lining material of the present invention is lined in a pipeline The expanded sectional view of the lamination member of the present invention

  The present invention will be described below with reference to the drawings. Reference numeral 1 denotes a lining material of the present invention, in which the laminated member 2 is rolled into a cylindrical shape, a plurality of the laminated members 2 are laminated, and a flexible airtight tube 3 is provided outside the outermost layer 2a. Has been placed.

  In this example, the laminated member 2 is laminated in three layers, the inner diameter of the outermost layer 2a and the outer diameter of the middle layer 2b are approximately the same, and the inner diameter of the middle layer 2b is substantially equal to the outer diameter of the inner layer 2c. In addition, the three laminated members 2 are laminated in a state of being in close contact with each other without causing wrinkles and without forming excessive gaps.

  FIG. 3 is an enlarged cross-sectional view showing a part of the laminated member 2 in FIG. In FIG. 3, the laminated member 2 has organic fiber spunbond nonwoven fabrics 5 and glass fiber chopped strand mats 6 alternately stacked, and the spunbond nonwoven fabrics 5 are arranged on both surfaces thereof. As the spunbond nonwoven fabric 5, for example, product number AN120 / WTE manufactured by Unitika Ltd. or product number 26705 / WXJ may be used. Moreover, as the chopped strand mat 6, a glass fiber having a length of about 30 to 70 mm is used. For example, product number ECM600-501 (width 1.040 mm) manufactured by Central Glass Co., Ltd. or product number ECM450-501 (width 1.860 mm) may be used.

  In addition, the chopped strand mat conventionally used for the lining material is obtained by dispersing glass fibers in an adhesive, and the glass fibers have a short fiber length (for example, in order to disperse uniformly) 3 mm or so) was used. On the other hand, the chopped strand mat 6 used in the present embodiment is obtained by laminating glass fibers in a random direction and laminating them with a uniform thickness, and then adding an adhesive and adhesively forming the mat. A longer glass fiber can be used. In this way, a high-strength repair structure can be realized by using the chopped strand mat 4 having a considerably longer glass fiber length than the conventional one for the lining material 1.

  Thus, in order to use the lining material 1, first, a reaction curable resin liquid such as unsaturated polyester resin or epoxy resin is injected into the lining material 1, and the reaction curable resin liquid is squeezed with an appropriate roller or the like. The laminated member 2 is impregnated. At this time, since the wrinkles and excessive voids are not formed in the laminated member 2 in the lining material 1, the reaction curable resin liquid does not stay locally and can be uniformly impregnated.

  In the present invention, the chopped strand mat 6 made of glass fibers and the spunbond nonwoven fabric 5 made of organic fibers are alternately arranged, so that the resin liquid applied to the laminated member 2 is a spunbond having a relatively good affinity. Since it penetrates through the nonwoven fabric 5 and shifts from the spunbond nonwoven fabric 5 to the chopped strand mat 6, it can be sufficiently impregnated into the chopped strand mat 6 which is inferior in affinity with the resin liquid.

  Then, the lining material 1 impregnated with the reaction curable resin liquid is inserted into the conduit 4 while the inner and outer surfaces are reversed by a fluid pressure by a known method. By reversing the lining material 1, the airtight tube 3 moves to the inside of the lining material 1, and the fiber layer made of the laminated member 2 moves to the outside and faces the inner surface of the conduit 4.

  In this state, the reaction-curing resin liquid is reacted and cured while pressing the fiber layer of the lining material 1 against the inner surface of the pipe line 4 by fluid pressure, and is reinforced by the laminated member 2 in the pipe line 4 as shown in FIG. FRP tube is formed. At this time, the lining material 1 may be bonded to the inner surface of the pipe line 4 by the reaction curable resin liquid. However, the lining material 1 forms a strong airtight FRP pipe and forms a flow path therein. , It does not necessarily have to be glued.

  When the lining material 1 is reversed, when the fiber layer of the lining material 1 is composed only of the chopped strand mat 6, the short fibers of the glass fibers constituting the chopped strand mat 6 have almost no entanglement. As a result, the short fibers are displaced, and the fiber layer of the lining material 1 may be partially deformed or broken in some cases.

  However, according to the present invention, since the laminated member 2 is formed by superimposing the spunbond nonwoven fabric 5 and the chopped strand mat 6, the spunbond nonwoven fabric 5 has a considerable strength, so that excessive deformation is prevented.

  Further, according to the present invention, since the fiber layer of the lining material 1 is formed by laminating a plurality of laminated members 2, each laminated member 2 behaves independently at the time of inversion, and the lining material 1 is inverted with a relatively small fluid pressure. be able to.

  In addition, the outermost layer 2a having a large diameter enters inside and the inner layer 2c having a small diameter is located outside by the reversal of the laminated member 2 laminated as described above, but each laminated member 2 behaves independently. Moreover, since it has the flexibility of the diameter, it can be smoothly reversed and lined without causing wrinkles or excessive deformation.

  As shown in FIG. 2, in the state of being lined on the inner surface of the pipe 4, the chopped strand mat 6 made of glass fiber is impregnated with a reaction curable resin liquid, so that a strong FRP pipe reinforced with glass fiber is used. Is formed.

In order to investigate the impregnation property of the resin liquid into the laminated member 2 in the present invention, the following test was performed.
(1) Two spunbond nonwoven fabrics (product number AN120 / WTE manufactured by Unitika Co., Ltd.) with a thickness of 2 mm are stacked and joined with a needle punch.
(2) Glass fiber chopped strand mat having a thickness of 4 mm (manufactured by Central Glass Co., Ltd., product number ECM600-501 (width 1.040 mm)).
(3) 2 mm thick spunbonded non-woven fabric (manufactured by Unitika Ltd., product number) on each side of 4 mm thick chopped strand mat (manufactured by Central Glass Co., Ltd., product number ECM600-501 (width 1.040 mm)) AN120 / WTE) and joined with a needle punch.

  For the above three samples, a 20 cm square test piece is placed on a table, and 8.2 g of an unsaturated polyester resin liquid (viscosity 1.75 dPa · s) is allowed to flow in the center of the upper surface and remains on the surface of the test piece after 10 minutes. The resin solution was removed with a spatula, and the weight increase from before the test was measured.

The results were as follows.
(1) 6.5-7.7g
(2) 3.4-4.0 g
(3) 4.0-5.3 g

  When the test piece after the test was visually observed, the resin liquid penetrated to the back surface in the test piece of (1), but the test piece of (2) and (3) penetrated to the back side of the test piece. It penetrated only to the middle of the chopped strand mat.

  However, the range in which the resin solution penetrated was about 6 cm in diameter in the test piece of (2), but in the range of about 7 cm in the test piece in (1) and (3), the resin solution was Permeation along the spunbond nonwoven was observed.

  The above test is a desk test, and it is difficult to say that the resin liquid is sufficiently impregnated even in the test piece (3) assuming the present invention. Because it is exposed and squeezed by applying force from the outside, the resin liquid spreads along the spunbonded nonwoven fabric and migrates from the spunbonded nonwoven fabric to the chopped strand mat so that it is impregnated. It is done.

Next, the following test was performed in order to investigate the optimum glass fiber length of the chopped strand mat.
A spunbonded nonwoven fabric (product number: AN120 / WTE, manufactured by Unitika Co., Ltd.) having a thickness of 2 mm was overlapped on both sides of a chopped strand mat having a thickness of 4 mm, and joined with a needle punch. However, as the chopped strand, a mat was prototyped using five kinds of glass fiber lengths of 25 mm, 30 mm, 50 mm, 70 mm, and 75 mm.

  The five types of mats were each rounded into a cylindrical shape and the ends were joined together to produce five types of cylindrical lining materials having an outer diameter of 600 mm. The end portions were joined by sewing, and a glass cloth was attached to the outer surface of the sewing portion with a hot melt adhesive. The five types of lining materials were impregnated with unsaturated polyester resin.

  For each of the five types of lining materials having different glass fiber lengths produced as described above, the presence or absence of variation in the thickness of the lining material when air pressure was applied to the inner surface to expand the diameter by 10%, and 10 The air pressure required for the% diameter expansion was examined. The results are shown in Table 1.

  In Table 1, the thickness variation of the lining material was determined by visually confirming the shape when the lining material was expanded by 10% in diameter. Specifically, in the case where the glass fiber length is 25 mm, the lining material is stretched locally and apparently does not become a circle, so that it is “x”. Further, empirically, it is recommended to use a lining material that is 5% smaller than the inner diameter of the pipe. Considering that there is some variation in the amount of expansion in the circumferential direction, it is considered that if the 10% diameter is expanded, it should be sufficiently adhered to the inner surface of the existing pipeline over the entire circumference. The thickness variation was determined in the state when the diameter was expanded. Further, from the same viewpoint, the air pressure necessary to perform 10% diameter expansion was measured. Here, from the viewpoint of ensuring the safety of construction, it is usually considered that the lining construction is performed at about 0.08 MPa. In Table 1, “◯”, 0. When exceeding 1 MPa, it was set as "x".

  Regarding the thickness variation, when the glass fiber length of the chopped strand mat is 30 to 75 mm, the thickness variation of the lining material is small and extends uniformly in the circumferential direction, whereas when the glass fiber length is 25 mm, the thickness is The variation is large and the circumferential extension is non-uniform. It is considered that when the glass fiber length is short, there is a portion where the circumferential strength is insufficient in the lining material, and the portion is thinned locally by extending greatly at that portion.

  On the other hand, regarding the air pressure required for 10% diameter expansion, when the glass fiber length is 25 to 70 mm, the air pressure is 0.1 MPa or less, but when the glass fiber length is 75 mm, it exceeds 0.1 MPa. End up. This is presumably because when the glass fiber length is long, the circumferential strength of the lining material becomes too high and the circumferential stretching is hindered.

  From the above test results, it is understood that the glass fiber length of the chopped strand mat is preferably 30 to 70 mm.

DESCRIPTION OF SYMBOLS 1 Lining material 2 Laminated member 3 Airtight tube 4 Pipe line 5 Spunbond nonwoven fabric 6 Chopped strand mat

Claims (4)

A laminated member for a lining material of a pipe line, characterized in that a chopped strand mat of glass fibers having a fiber length of 30 to 70 mm and a spunbond nonwoven fabric of organic fibers are superposed and joined by needle punching.   2. The laminated member for a lining material of a pipe line according to claim 1, wherein the chopped strand mat and the spunbond nonwoven fabric are alternately overlapped, and the spunbond nonwoven fabric is positioned on both surfaces.   A lining of a pipe, characterized in that the laminated member according to claim 1 or 2 is rolled into a cylindrical shape, a plurality of the cylindrical laminated members are laminated, and a flexible airtight tube is disposed at the outermost part. Wood. Laminated member adjacent to inside and outside, characterized in that the inner diameter of the outer diameter and the outer lamination members inside the lamination members equal conduit lining material according to claim 3.

Images