JP2019074099A - Laminate for pipe regeneration and member for pipe regeneration - Google Patents

Abstract

To provide a laminate for pipe regeneration capable of securing an excellent water conduction property by improving thickness uniformity of a member for pipe regeneration, and preventing a strength of a regenerated pipe from being reduced by stress concentration caused by thickness non-uniformity, and the member for pipe regeneration.SOLUTION: The present invention relates to a laminate for pipe regeneration which is a sheet-shaped laminate comprising a first layer consisting of a first material and a second layer consisting of a second material and being laminated on the first layer. A thermosetting resin is impregnated in the laminate beforehand. The laminate includes an exposure region in which the second layer is exposed, in front-face end at one side of the laminate and in a rear-face end at another side opposite to the one side. A layer in the exposure region is thicker than a layer of the laminate in any other region than the exposure region. The present invention also relates to a member for pipe regeneration comprising an inner liner 11 for which the second layers exposed on a front face at the one side of the laminate for pipe regeneration and exposed on a rear face at the other side are connected and made cylindrical.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a pipe regenerating laminate and a pipe regenerating member for use in internal repair of existing pipes such as clean water and agricultural water channels.

  When existing pipes such as concrete pipes and metal pipes buried in the ground as drinking water and agricultural water channels age-deteriorate, there is put into practical use a method of repairing the inner surface without digging up the existing pipes. As one of these methods, there is a method called on-site curing type restoration method. In this construction method, a reworking member (lining material) impregnated with a thermosetting resin in advance is used.

  As a member for rehabilitation used for this construction method, there is, for example, one shown in Patent Document 1. This lining material has a coating layer and a resin impregnated layer impregnated with a thermosetting resin. The resin impregnated layer is a sheet-like substrate in which a non-woven fabric and a reinforcing material are laminated. The sheet-like substrate is formed into a tubular shape by joining the end portions in the width direction thereof with a joining device such as hot melt. Then, at the time of construction, the lining material is provided inside the existing pipe that has deteriorated over time, and fluid pressure such as steam is supplied to the inside of the pipe for diameter expansion in the pipe body. Then, the layer impregnated with the resin is brought into close contact with the inner surface of the existing pipe and hardened, and the inner surface of the existing pipe is covered with the lining material (see paragraphs 0023 to 0046 of Patent Document 1 and FIG. 3).

JP, 2013-208828, A

  In the configuration of Patent Document 1, when the diameter of the lining material is expanded in the tubular body, the end portions of the sheet-like base materials are joined so as to overlap. For this reason, the thickness of the base material at the bonding location is larger than the thickness of the base material at the location other than the bonding location, and there is a risk of adversely affecting the water flow characteristics of the existing pipe due to the nonuniformity of the thickness. . Furthermore, stress concentration may occur at the junction, and peeling may occur at the junction due to the stress concentration, which may lower the strength of the rehabilitated pipe.

  Therefore, the present invention improves the uniformity of thickness of the member for rehabilitating a tube and secures good water flow characteristics, and prevents the strength of the rehabilitated tube from being lowered by stress concentration caused by the non-uniformity of thickness. To be an issue.

  In order to solve the above problems, the present invention is a sheet-like material having a first layer made of a first material and a second layer made of a second material and laminated on the first layer. The laminate is impregnated with a thermosetting resin in advance, and a front surface end of one side of the laminate, and a rear surface end of the other side opposite to the one side. And the exposed layer where the second layer is exposed, wherein the thickness of the layer in the exposed area constitutes a laminate for regenerating a tube which is thinner than the thickness of the layer in the area other than the exposed area. did.

  In this case, when making this laminated body cylindrical, the portions of the exposed region where the thickness of the layer is thin will be joined, and the increase in thickness at the joined portion accompanying this joining is prevented as much as possible. be able to. For this reason, the thickness uniformity of the member for pipe retreading can be improved, and a favorable water flow characteristic can be ensured. In addition, the same kind of materials (here, the second materials) are to be joined, and it is possible to secure sufficient joint strength to prevent peeling.

  In the above configuration, it is preferable that the first layer be stacked on the front and back surfaces of the second layer in the region other than the exposed region. In this manner, the layer configuration is symmetrical in the thickness direction and the versatility is enhanced, so that the workability can be improved.

  In each of the above-described configurations, it is preferable that the first material is a non-woven fabric and the second material has a reinforcing fiber. In this way, it is possible to achieve both the flexibility of the non-woven fabric layer and the strength of the layer having reinforcing fibers, and it is possible to easily carry out the work using this laminate for pipe rehabilitating and to the strength for the strength. Reliability can be secured.

  In the configuration in which the second material includes reinforcing fibers, it is preferable that the reinforcing fibers be a non-crimp fabric. In this non-crimp fabric, a layered mixed yarn is configured to maintain unidirectionality, and unlike a general woven fabric, no crimp occurs due to the crossing of a warp and a weft. For this reason, it has high strength and elasticity, and sufficient strength can be secured without increasing the thickness of the laminate.

  The tube retreading laminate according to each of the above configurations is a cylindrical inner liner formed by joining the second layers exposed on the surface on the one side and the back surface on the other side of the tube retreading laminate. It can apply to the member for pipe retreading provided with. As described above, by applying the laminate for pipe retreading to the inner liner as a member for pipe retreading, the thickness uniformity of the cylindrical inner liner in the circumferential direction is improved, as described above. While being able to ensure a good water flow characteristic, sufficient joint strength of the junction part of the cylindrical inner liner can be ensured, and peeling of this inner liner can be prevented.

  In this configuration, an outer liner is formed by joining the second layers exposed on the front surface on one side and the rear surface on the other side of the laminate for a pipe retreading to the outside of the inner liner and forming a cylindrical outer liner. It is preferable to further provide Thus, by providing the outer liner on the outside of the inner liner, the strength of the pipe reworking member can be further enhanced.

  In the configuration provided with the inner liner and the outer liner, a joint portion where the one side and the other side of the inner liner are joined, and a joint where the one side and the other side of the outer liner are joined are Preferably, it is configured to be in an annular circumferential symmetric position. In this way, when the pipe rehabilitating member is brought into intimate contact with the inner surface of the existing pipe, the force acting on each liner along with the intimate contact acts in a distributed manner at circumferentially symmetrical positions, so that each liner It is possible to further prevent the occurrence of peeling at the joints of

  In each of the pipe retreading members described above, it is preferable that the inner liner further includes a cylindrical reinforcing member for supporting the inner liner from the inside. As described above, by providing the reinforcing member, the strength of the pipe reworking member can be further enhanced, and the strength as the self-supporting pipe can be secured.

  In the present invention, it is a sheet-like laminate having a first layer made of a first material and a second layer made of a second material and laminated on the first layer, The thermosetting resin is impregnated in the laminate in advance, and the second layer is formed on the surface end of one side of the laminate and the back end of the other side opposite to the one side. A tube regenerating laminate having an exposed exposed area is provided, and further, an inner liner comprising the tube regenerating laminate is provided, and the thickness of the layer in the exposed region is the laminate in the region other than the exposed region. The tube regenerating member was thinner than the thickness of the body layer.

  Thereby, when making this laminated body cylindrical, the thin part of the layer of the said exposure area | region will be joined, and the increase in the thickness in the joining location accompanying this joining can be prevented as much as possible. For this reason, while improving the thickness uniformity of the member for pipe retreading, ensuring a good water flow characteristic, it can prevent that the intensity | strength of a retreading pipe falls by the stress concentration resulting from the thickness non-uniformity. . In addition, the same kind of materials (here, the second materials) are to be joined, and it is possible to secure sufficient joint strength to prevent peeling, and to prevent defects associated with peeling. it can.

Sectional drawing which shows one Embodiment of the member for pipe retreading using the laminated body for pipe retreading which concerns on this invention Side view of pipe rejuvenation laminate It is a side view showing a junction of an inner liner and an outer liner, and (a) is before diameter expansion of a member for pipe retreading, (b) is after diameter expansion of a member for pipe retreading. Side view of another example of pipe rejuvenating laminate It is a side view showing a junction of an inner liner and an outer liner, and (a) is before diameter expansion of a member for pipe retreading, (b) is after diameter expansion of a member for pipe retreading. Side view of reinforcement member It is sectional drawing of the existing pipe which provided the member for pipe retreading, Comprising: (a) before diameter expansion of the member for pipe retreading, (b) after diameter expansion of the member for pipe retreading Sectional drawing of the principal part which shows the junction part after diameter expansion of the member for tube retreading

  One embodiment of a tube retreading member 10 using a tube retreading laminate according to the present invention is shown in FIG. The pipe retreading member 10 is used as a retreading member for repairing the inner surface of an existing pipe P such as a concrete pipe or a metal pipe embedded in the ground as a water passage or the like. The pipe reworking member 10 includes an inner liner 11, an outer liner 12 and a reinforcing member 13 as main components.

  The thickness of the pipe reopening member 10 can be appropriately determined according to the nominal diameter of the existing pipe P to which the pipe reopening member 10 is applied, the flow rate thereof, etc., but a few millimeters to a few centimeters Is preferred. In addition, although the actual thickness of the inner liner 11, the outer liner 12, and the reinforcement member 13 is small enough compared with those outer diameters after construction, in each of the following figures, it is easy to see the member 10 for pipe rehabilitation In order to do that, the thickness is emphasized and drawn.

  The outer liner 12 is provided on the outer side of the inner liner 11. The reinforcing member 13 is provided on the inner side of the inner liner 11 and reinforces the inner liner 11.

  As shown in FIG. 2, the inner liner 11 and the outer liner 12 are formed of a pipe rejuvenating laminate, which is a laminate of the first layer 14 and the second layer 15. This pipe retreading laminate has a rectangular sheet-like outer shape.

  This pipe retreading laminate has the first layer 14 on the front and back sides and the second layer 15 at the center in the thickness direction. Then, the second layer 15 is formed on the front surface end of one side (the left end in FIG. 2) of this laminate, and on the rear surface end of the other side (the right end in FIG. 2) facing the one side. It has an exposed exposed area. The thickness of the layer in the exposed area is thinner than the thickness of the layer in the area other than the exposed area. In this embodiment, the thickness of the layer in the exposed area is about half of the thickness of the layer in the area other than the exposed area (see FIG. 2).

  The laminate is impregnated with a thermosetting resin in advance. The type of the thermosetting resin is not particularly limited, and unsaturated polyester resins, epoxy resins, vinyl ester resins, melamine resins and the like can be widely adopted.

  The first layer 14 is made of a first material. In the present embodiment, a non-woven fabric using polyethylene (PET) is employed as the first material.

  The second layer 15 is made of a second material. In the present embodiment, a reinforcing fiber made of glass fiber is adopted as the second material.

  This reinforcing fiber is a non-crimp fabric. A non-crimp fabric differs from the structure in which a warp and a weft cross as in a general woven fabric, and a layered mixed fiber maintains a directionality, so that a crimp associated with a cross between a warp and a weft ) Is configured not to occur. For this reason, it has high strength and elasticity, and sufficient strength can be secured without increasing the thickness of the laminate.

  This laminate is configured as follows. First, the first material and the second material are laminated, and both materials are integrated by needle punching. Two integrated laminates (hereinafter referred to as the front side layer A and the back side layer B) are prepared, and the second layer 15 (the layer made of the second material) of the front side layer A and the front and back reverse. The second layer 15 (layer made of the second material) of the back side layer B is made to face each other, and the second side layer A and the back side layer B are slightly shifted along the opposite face, Bond the 15 together. Thus, an exposed area where the second layer 15 is exposed is provided at the front surface end of one side of the back surface side layer B and the back surface end of the other side of the front surface layer A, except for the exposed area. In the area, a pipe regenerating laminate is formed in which the first layer 14 is laminated on the front and back surfaces of the second layer 15 (see FIG. 2).

  As shown in FIG. 3A, the first layer 14 on one side and the first layer 14 on the other side of the pipe retreading laminate are overlapped and joined to form a cylindrical inner liner 11. And the outer liner 12. The overlap amount is w1. Thus, by making the one side and the other side overlap by a predetermined amount w1, the outer diameters of the inner liner 11 and the outer liner 12 before the diameter expansion are reduced, and it becomes easy to install in the existing pipe P ing. In the member 10 for pipe retreading shown in FIG. 1, the lower end portion of the inner liner 11 and the upper end portion of the outer liner 12 are joint portions.

  The bonding between the one side and the other side can be performed by using an adhesive or by sewing with a thread, but the method is not particularly limited. Further, for example, while the bonding of the inner liner 11 is performed in the form of spots at predetermined intervals in the axial direction of the cylindrical shape, the bonding of the outer liner 12 is performed in a linear manner, Bonding strength may be made different by changing. The joint strength is such that the joint between the second layers 15 is overlapped at the time of diameter expansion of the pipe reworking member 10 while reliably preventing exfoliation at the time of handling or construction of the tube reworking member 10. The strength is such that they can slide smoothly relative to each other (temporary tack strength).

  When the diameter of the pipe regenerating member 10 (see FIG. 7A) inserted into the existing pipe P is expanded and a circumferential force (see the arrow in FIG. 3A) acts on each of the liners 11 and 12, The bond (temporary fixing) between the first layer 14 on one side and the first layer 14 on the other side is released, and the layers 14 and 14 slide relative to each other. Then, as shown in FIG. 3B, a state in which the second layer 15 exposed on the front surface on one side and the second layer 15 exposed on the rear surface on the other side are joined by a thermosetting resin. It becomes. At this time, the overlap amount at the joint portion changes from w1 to w2 before the diameter expansion.

  As described above, when the second layer 15 on one side and the second layer 15 on the other side are joined at the time of diameter expansion, a step in the joint portion of the inner liner 11 and the outer liner 12 (FIG. a) see a) and it becomes flat. For this reason, the favorable water flow characteristic of the existing pipe | tube P is securable.

  As shown in FIG. 4, instead of bonding the front side layer A and the back side layer B slightly offset and bonding as described above, as shown in FIG. After laminating the second layer 15 (the layer made of the second material), predetermined portions at both ends of the first layer 14 may be cut. Thus, an exposed region where the second layer 15 is exposed is provided at the front surface end of one side of the laminate and the rear surface of the other side, and the second layer is formed in the region other than the exposed region. A tube regenerating stack is formed, in which the first layer 14 is stacked on the back surface of the layer 15.

  As shown in FIG. 5 (a), the second layer 15 on one side of the pipe retreading laminate and the second layer 15 on the other side are overlapped and joined (temporarily fixed) to form a tubular shape. The inner liner 11 and the outer liner 12 of the The overlap amount is w3.

  If the diameter of the pipe regenerating member 10 (see FIG. 7A) inserted into the existing pipe P is expanded and the circumferential force (see the arrow in FIG. 5A) acts on each of the liners 11 and 12, The bond (temporary fixing) between the second layer 15 on one side and the second layer 15 on the other side is released, and the two layers 15, 15 slide relative to each other. Then, as shown in FIG. 5B, a state in which the second layer 15 exposed on the front surface on one side and the second layer 15 exposed on the rear surface on the other side are joined by a thermosetting resin. It becomes. At this time, the overlap amount at the joint portion changes from w3 to w4 before the diameter expansion.

  When the laminate for pipe regrowth shown in FIG. 4 is used, the thickness non-uniformity of the overlapped joint portion is reduced by the thickness of the first layer 14 along with the above-mentioned slide, and good water passing characteristics are obtained. Is secured. Furthermore, it is possible to prevent the bond from peeling off due to stress concentration in the uneven thickness portion and the strength of the rehabilitated tube from being reduced.

  As shown in FIG. 1, the joint portion where the one side and the other side of the inner liner 11 are joined, and the joint where the one side and the other side of the outer liner 12 are joined have an annular circumferential direction. It is a symmetrical position of In this way, when the pipe rehabilitating member 10 is brought into close contact with the inner surface of the existing pipe P, the force acting on each of the liners 11 and 12 along with the close contact disperses at symmetrical positions in the circumferential direction. Do. For this reason, it is possible to reliably prevent the occurrence of peeling at the joint between the liners 11 and 12.

  As shown in FIG. 6, the reinforcing member 13 has a rectangular shape in which two rectangular sheets 13a and 13b made of glass knit are overlapped, and both ends of each rectangular sheet 13a and 13b are joined. . This bonding can be performed by use of an adhesive or welding, but the bonding method is not particularly limited.

  When a bending test was performed using the pipe reworking member 10 provided with the reinforcing member 13 and the pipe reworking member 10 not provided with the reinforcing member 13, the tube reworking member 10 provided with no reinforcing member 13 On the other hand, in the pipe rehabilitating member 10 provided with the reinforcing member 13, separation does not occur in the joint even when a load exceeding the predetermined load is applied, while peeling occurs in the joint due to a load greater than the predetermined load. It could be confirmed.

  Although not shown in FIG. 1 and the like, an impermeable film which does not pass the resin material before curing is provided on the outer side of the outer liner 12 and the inner side of the reinforcing member 13. By providing this film, it is possible to prevent the problem that the thermosetting resin leaks to the outside of the pipe reworking member 10 during construction. As a material of this film, thermoplastic resins such as polyethylene and nylon are preferably employed, but other types of resins can also be employed.

  At the time of construction of the member 10 for pipe retreading, as shown in FIG. 7A, first, the member 10 for pipe retreading before diameter expansion is installed in the existing pipe P to be repaired. Then, hot air, high temperature water vapor, etc. are fed into the inside of the pipe reworking member 10, and the heat and the pressure from the inside of the tube reworking member 10 cause this to move as shown in FIG. 7 (b) and FIG. The diameter of the pipe reopening member 10 is increased and the thermosetting resin is cured to bring the pipe reopening member 10 into close contact with the inner surface of the existing pipe P.

  The pipe retreading laminate and the pipe retreading member 10 described above are illustrative in all respects, and the thickness uniformity of the pipe retreading member 10 is improved to ensure good water flow characteristics, and the thickness The configuration can be appropriately changed as long as the problem of the present invention can be solved, that the stress concentration caused by the non-uniformity prevents the strength of the rehabilitated tube from being reduced.

  For example, although the above-mentioned embodiment explained composition which adopted both liners 11 and 12 of inner liner 11 and outer liner 12, it can also be considered as composition which has only inner liner 11. In addition, if sufficient strength can be secured only by the inner liner 11 and the outer liner 12, the reinforcing member 13 can be omitted. In addition, the layer configuration of each layer of each liner 11 and 12 and the material used are not limited to the above. For example, a third layer other than the first layer 14 and the second layer 15 may be appropriately modified. It is possible to add.

DESCRIPTION OF SYMBOLS 10 Tube retreading member 11 Inner liner 12 Outer liner 13 Reinforcing member 13a, 13b Rectangular sheet 14 1st layer 15 2nd layer

Claims (8)

A first layer (14) of a first material,
A second layer (15) made of a second material and laminated to the first layer (14);
A sheet-like laminate having
The laminate is pre-impregnated with a thermosetting resin,
It has an exposed area where the second layer (15) is exposed at the front surface end of one side of the laminate and the rear surface end of the other side opposite to the one side,
The pipe retreading laminate, wherein the thickness of the layer in the exposed area is thinner than the thickness of the layer in the area other than the exposed area.   The layered product for tube retreading according to claim 1, wherein the first layer (14) is stacked on the front and back surfaces of the second layer (15) in a region other than the exposed region.   The laminate according to claim 1 or 2, wherein the first material is a non-woven fabric and the second material has a reinforcing fiber.   The laminate for tube regeneration according to claim 3, wherein the reinforcing fiber of the second material is a non-crimp fabric.   The second layer (15) exposed on the surface on one side and the back surface on the other side of the tube retreading laminate according to any one of claims 1 to 4 is joined to form a tube. Pipe retreading member provided with an inner liner (11).   The second layer exposed to the outer surface of the inner liner (11) and the back surface of the one side and the other side of the laminate for a tube regeneration according to any one of claims 1 to 4 15) The member for rehabilitating a tube according to claim 5, further comprising an outer liner (12) formed by joining together to form a tubular shape.   The joint portion in which the one side and the other side of the inner liner (11) are joined, and the joint in which the one side and the other side of the outer liner (12) are joined have an annular circumferential direction The pipe regenerating member according to claim 6, which is in a symmetrical position.   The member for pipe retreading according to any one of claims 5 to 7, further comprising a cylindrical reinforcing member (13) for supporting the inner liner (11) from the inside on the inner side of the inner liner (11). .

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