JP2015229878A - Segment manufacturing method and rehabilitation pipe using the segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost manufacturing method for a segment that may be used with existing pipes of varying diameters, to be installed on rehabilitation pipes of varying sizes.SOLUTION: A manufacturing method of the present invention is for manufacturing, by injection molding and using a mold 10, a segment 1 used with a plurality of polygonal or cylindrical rehabilitation pipes that are installed on an inner side of an existing pipe having a roughly circular cross-section, along the peripheral and longitudinal directions of the existing pipe for rehabilitating the existing pipe. The segment 1 is molded using a common mold 11 and a deflection mold 16, through the steps for: calculating an angle of inclination of an outer surface of first and second flange parts 3, 4 to a base part 2, the angle being suited to the diameter of the existing pipe; providing a deflection mold 16 that suits the angle of inclination; and injecting molded materials. Thus, the segment 1 that may be used with existing pipes of varying diameters and installed on rehabilitation pipes of varying sizes may be manufactured using the common mold 11.

Description

  The present invention relates to a method of manufacturing a segment used for a rehabilitation pipe for rehabilitating an existing pipe, and a rehabilitation pipe using the segment. More specifically, the present invention relates to a method for manufacturing a segment used for a rehabilitation pipe having a different size corresponding to an existing pipe having a different diameter, and a rehabilitation pipe using the segment manufactured at a low cost. .

  Conventionally, as a method of repairing existing pipes such as aging tunnels and sewer pipes, rehabilitation pipes are formed along the inner walls of existing pipes, and groats such as mortar and concrete are filled between existing pipes and rehabilitation pipes. A method for rehabilitating an existing pipe is known (Patent Document 1). The rehabilitation pipe used in this method is formed in a substantially cylindrical shape along the inner wall of an existing pipe by connecting a plurality of segments 100 shown in FIG. Although existing pipes having various diameters exist, rehabilitation pipes having a diameter corresponding to the diameter of the existing pipe are formed for existing pipes having different diameters.

JP 2009-287290 A

  As shown in FIG. 8, the segment 100 disclosed in Patent Document 1 constitutes a part of the inner peripheral surface of the rehabilitation pipe, and includes a wall surface part 101 having a radius of curvature corresponding to the diameter of the rehabilitation pipe, and the segment 100. And a flange portion 102 for connecting them in the circumferential direction of the rehabilitation pipe. When forming a rehabilitation pipe having a different diameter, it is necessary to use a segment 100 having a wall surface portion 101 having a radius of curvature corresponding to the diameter of the rehabilitation tube and a flange portion 102 having a shape and an angle corresponding thereto. The segment 100 is manufactured by injection molding using a mold, but in order to change the curvature radius of the wall surface portion 101 and the shape of the flange portion 102, it is necessary to replace the entire mold to be used. For example, FIG. 9A shows a cross section of the mold 103 when the curvature radius of the wall surface portion 101 is reduced, and FIG. 9B shows a cross section of the mold 103 when the curvature radius of the wall surface portion 101 is increased. Is schematically shown. As described above, every time the diameter of the rehabilitation pipe changes, the entire mold must be redesigned and remanufactured, resulting in a problem that the manufacturing cost is enormous.

  The present invention has been made in view of the above problems, and provides a method for manufacturing a segment disposed in a rehabilitating pipe having a different size, which can accommodate existing pipes having different diameters, at a low cost. It aims at providing the rehabilitation pipe | tube using the segment manufactured by this.

  In the manufacturing method of the present invention, a plurality of segments disposed in the circumferential direction and the length direction of the existing pipe inside the existing pipe having a substantially circular cross section are used for the polygonal cylindrical rehabilitation pipe that regenerates the existing pipe. The method of manufacturing by injection molding using a mold, wherein the segment is erected from a plate-like base portion constituting a part of the inner peripheral surface of the rehabilitation pipe and one side edge of the base portion At least one flange portion and a second flange portion erected from another side edge substantially parallel to one side edge of the base portion, and the outer surfaces of the first flange portion and the second flange portion are: The plurality of segments are arranged in the circumferential direction of the existing pipe on the outer surface of the first flange portion to form the rehabilitation pipe. Sometimes other segments adjacent to the rehabilitation pipe in the circumferential direction The segment is formed using a common mold and a deflecting mold, and the method depends on the diameter of the existing pipe and the first and second An existing pipe having a different diameter, comprising: a step of calculating an inclination angle of the outer surface of the flange portion with respect to the base portion; a step of providing the deflection mold according to the inclination angle; and a step of injecting a molding material. It is possible to manufacture the segments arranged in the rehabilitation pipes of different sizes, which can correspond to the above, using a common mold.

  In the manufacturing method of the present invention, the common mold forms an upper mold for forming the inner surface of the base portion and the inner surfaces of the first and second flange portions, and the outer surface of the base portion. Preferably, the deflection mold includes a first deflection mold and a second deflection mold for forming the outer surfaces of the first and second flange portions, respectively. .

  The rehabilitation pipe of the present invention is characterized in that a segment having the same width of the base or at least two types of segments having different widths of the base is manufactured by the above manufacturing method.

  The rehabilitation pipe of the present invention is a rehabilitation pipe which is provided inside an existing pipe having a substantially circular cross section and rehabilitates the existing pipe, and the rehabilitation pipe is disposed in a circumferential direction and a length direction of the existing pipe. A plurality of segments, the segment comprising a plate-like base portion constituting a part of the inner peripheral surface of the rehabilitation pipe, a first flange portion erected from one side edge of the base portion, and the base portion At least a second flange portion erected from another side edge substantially parallel to the one side edge, and the outer surfaces of the first flange portion and the second flange portion spread from each other as they are separated from the base portion. The outer surface of the first flange portion is disposed in the circumferential direction of the existing pipe, and the plurality of segments are arranged in the circumferential direction of the existing pipe, and the regenerated pipe is formed in the circumferential direction. In contact with the outer surface of the second flange of another adjacent segment , A plurality of the segments in the circumferential direction and the longitudinal direction of the existing pipe is arranged, characterized in that it is formed in a polygonal cylindrical shape.

  Moreover, it is preferable that the rehabilitation pipe | tube of this invention is arrange | positioned at least 2 types of segments from which the width | variety of the said base differs.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to provide the method of manufacturing the segment arrange | positioned in the rehabilitation pipe | tube of a different magnitude | size which can respond to the existing pipe | tube which has a different diameter, it was manufactured at low cost. Rehabilitation tubes using segments can be provided.

It is a perspective view which shows one Embodiment of the rehabilitation pipe | tube using the segment obtained by the manufacturing method of this invention. It is a perspective view which shows one Embodiment of the segment obtained by the manufacturing method of this invention. FIG. 3 is a side view of the segment shown in FIG. 2. It is a perspective view which shows typically the metal mold | die used with the manufacturing method of the segment of this invention. It is a side view which shows one Embodiment of the rehabilitation pipe | tube using the segment obtained by the manufacturing method of this invention. (A) is a side view which shows one Embodiment of the rehabilitation pipe | tube of this invention corresponding to the case where the diameter of an existing pipe is small, (b) is the rehabilitation pipe | tube of this invention corresponding to the case where the diameter of an existing pipe is large. It is a side view which shows one Embodiment. (A) is a side view which shows one Embodiment of the segment used for the rehabilitation pipe | tube of this invention corresponding to the case where the diameter of an existing pipe is small, (b) this invention corresponding to the case where the diameter of an existing pipe is large. It is a side view which shows one Embodiment of the segment used for the rehabilitation pipe | tube. It is a perspective view of the conventional segment. (A) is sectional drawing which shows typically the metal mold | die used when manufacturing the conventional segment with a small curvature radius, (b) is used when manufacturing the conventional segment with a large curvature radius. It is sectional drawing which shows a metal mold | die typically.

  Hereinafter, a segment manufacturing method and a rehabilitation pipe using the segment according to the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the segment 1 obtained by the manufacturing method of the present invention is used for a rehabilitation pipe P provided inside an existing pipe T having a substantially circular cross section such as a tunnel or a sewer pipe. As shown in FIG. 1, a plurality of segments 1 are arranged in the circumferential direction CT and the length direction LT of the existing pipe T, and are connected to each other to form a polygonal cylindrical rehabilitation pipe P. The rehabilitating pipe P is provided inside the existing pipe T, and a gap between the existing pipe T and the rehabilitating pipe P is filled with a grout (not shown) such as cement or mortar to rehabilitate the existing pipe T. As shown in FIG. 1, the rehabilitation pipe P is formed in a polygonal cylindrical shape. More specifically, the rehabilitation pipe P is formed in a polygonal cylindrical shape in which a curve connecting the vertices of the polygon is substantially circular. In the present embodiment, the rehabilitation pipe P is formed in a cylindrical shape having a regular polygonal cross section, but the cross section may be a polygonal circle and may include sides having different lengths. Moreover, the segment 1 can be applied not only to a tunnel or a sewer pipe but also to a rehabilitation pipe for rehabilitating an existing pipe T having a substantially circular cross section.

  As shown in FIGS. 1 to 3, the segment 1 of the present invention has a plate-like base portion 2, a first flange portion 3 erected from one side edge of the base portion 2, and one side edge of the base portion 2. And at least a second flange portion 4 erected from another substantially parallel side edge. The segment 1 is further erected from a third flange portion 5 standing from one secondary side edge intersecting with one side edge of the base portion 2 and from another secondary side edge substantially parallel to the one secondary side edge of the base portion 2. And a fourth flange portion 6. As shown in FIG. 1, the segment 1 is disposed so that the free end sides of the first to fourth flange portions 3, 4, 5, 6 face the inner wall of the existing pipe T, and the base 2 and the first to first Grout is filled in the space surrounded by the fourth flange portions 3, 4, 5, 6. As will be described in detail later, the segment 1 includes a synthetic resin having rigidity, and is manufactured by injection molding using a mold 10 (see FIG. 4). As the material of the segment 1, for example, hard polyvinyl chloride, high density polyethylene (HDPE), polypropylene or the like can be used.

  The base 2 constitutes a part of the inner peripheral surface of the rehabilitation pipe P as shown in FIG. The size of the base 2, that is, the width in the circumferential direction CP of the rehabilitated pipe P and the length in the length direction LP can be arbitrarily determined according to the size of the rehabilitated pipe P corresponding to the existing pipe T having different diameters. it can. However, as will be described in detail below, from the viewpoint of the manufacturing cost of the segment 1, when forming the rehabilitating pipes P of different sizes that can accommodate the existing pipes T of different diameters, the same size or at least two types of A segment 1 having a sized base 2 is used. In addition, in this embodiment, two side edges of the base portion 2 where the first and second flange portions 3 and 4 are erected are the two side edges of the base portion 2 where the third and fourth flange portions 5 and 6 are erected. Although it is substantially perpendicular to the two sub-side edges, the two side edges may be substantially parallel to each other and the two sub-side edges may be substantially parallel to each other. You may cross at other angles. In addition, the base portion 2 is formed in a substantially flat plate shape in the present embodiment, but may be formed in a plate shape and constitute a part of the inner peripheral surface of the rehabilitation pipe P, and may have irregularities. It may be another plate-like shape such as curved.

  In the present embodiment, the base portion 2 includes a protrusion 21 erected in an arc shape as shown in FIG. After the plurality of segments 1 are connected to form the rehabilitation pipe P, a hole is formed along the arcuate protrusion 21 and an injection hole (not shown) for injecting grout from the inside of the rehabilitation pipe P. Is provided. Then, grout is injected from this injection hole.

  As shown in FIG. 1, the first flange portion 3 and the second flange portion 4 of the segment 1 are connected to each other in the circumferential direction CP of the rehabilitated pipe P to connect the segments 1 to each other. The second flange portion 4 and the first flange portion 3 are connected. The outer surface 3a of the first flange portion 3 is adjacent in the circumferential direction CP of the rehabilitated pipe P when the plurality of segments 1 are disposed in the circumferential direction CT of the existing pipe T and the rehabilitated pipe P is formed. It contacts the outer surface 4 a of the second flange portion 4 of the other segment 1. Here, as shown in FIGS. 1 to 3, the outer surfaces 3 a and 4 a of the first flange portion 3 and the second flange portion 4 are inclined and erected so as to spread from each other as the distance from the base portion 2 increases. ing. Since the outer surfaces 3a and 4a of the first and second flange portions 3 and 4 are inclined so as to spread out in this way, the outer surface 3a of the first flange portion 3 of the segment 1 and the second surfaces of the other segments 1 The segments 1 are connected to each other so that the outer surfaces 4a of the flange portions 4 are in contact with each other, whereby the outer surfaces 2a of the base portion 2 (the first to fourth flange portions 3, 4, 5, 6 are erected). The surfaces opposite to each other (see FIG. 3) are connected with an inclination in a direction facing each other. Then, by connecting a plurality of segments 1 in the same manner, as shown in FIG. 1, a polygonal cylindrical shape having a polygonal circular cross section with the width of each segment 1 in the circumferential direction CP of the rehabilitation pipe P as one side. Rehabilitation pipe P is formed. In the present embodiment, the first and second flange portions 3 and 4 have inner surfaces 3b and 4b that extend substantially perpendicular to the base 2, and both outer surfaces 3a and 4a have the same inclination angle θ ( 5), the outer surfaces 3a and 4a only need to be inclined so as to be separated from each other as they are separated from the base 2, and the inner surfaces 3b and 4b are inclined with respect to the base 2. Alternatively, each of the outer surfaces 3a and 4a may have a different inclination angle θ. Further, in the present embodiment, the outer surfaces 3a and 4a and the inner surfaces 3b and 4b of the first and second flange portions 3 and 4 are both formed substantially flat, but the outer surfaces 3a and 4a are separated from the base portion 2. Accordingly, it may be inclined so as to be separated from each other, and may be formed in other shapes such as having unevenness.

  The inclination angle θ of the first and second flange portions 3 and 4 with respect to the base portion 2 is determined according to the size of the rehabilitated pipe P necessary to accommodate existing pipes T having different diameters, as will be described in detail later. It is done. For example, when forming the rehabilitation pipe P having a small diameter (FIG. 6A), the inclination angle θ of the outer surfaces 3a, 4a of the first and second flange portions 3, 4 is increased (FIG. 7A). ), Θ = θ1), when forming the rehabilitation pipe P having a large diameter (FIG. 6B), the inclination angle θ of the outer surfaces 3a, 4a of the first and second flange portions 3, 4 is reduced. (FIG. 7B, θ = θ2). In this way, the diameter of the rehabilitated pipe P can be changed only by changing the inclination angle θ of the outer surfaces 3a, 4a of the first and second flange portions 3, 4.

  On the other hand, the third flange portion 5 and the fourth flange portion 6 of the segment 1 are connected to each other in order to connect the segments 1 to each other in the longitudinal direction LP of the rehabilitation pipe P as shown in FIG. It is connected to one fourth flange portion 6 and the third flange portion 5. And the outer surface 5a of the 3rd flange part 5 is arranged in the length direction LP of the rehabilitation pipe P when the plurality of segments 1 are arranged in the length direction LT of the existing pipe T and the rehabilitation pipe P is formed. The outer surface 6a of the 4th flange part 6 of the adjacent segment 1 contacts. Here, in the present embodiment, the third and fourth flange portions 5 and 6 extend substantially perpendicular to the base portion 2 from the base portion 2 as shown in FIGS. 1 and 2. Therefore, by connecting the segments 1 so that the outer surface 6a of the fourth flange portion 6 of the other segment 1 is in contact with the outer surface 5a of the third flange portion 5 of the segment 1, the segments 1 are substantially Connected in a straight line. And the rehabilitation pipe | tube P can be extended to the length direction LP by connecting the some segment 1 similarly. In the present embodiment, the third and fourth flange portions 5 and 6 are erected substantially perpendicular to the base portion 2, but the segments 1 are substantially linear with each other in the length direction LP of the rehabilitation pipe P. For example, even if each is inclined such that the sum of the inclination angle of the outer surface 5a of the third flange portion 5 and the inclination angle of the outer surface 6a of the fourth flange portion 6 is about 180 °. Good.

  Each of the first to fourth flange portions 3, 4, 5, 6 is provided with a plurality of holes H through which bolts and the like are inserted, and a plurality of holes GH through which the grout is passed after connecting the segments 1 to each other. The segments 1 are connected to each other by a bolt (not shown) inserted through the hole H, fixed by a nut (not shown). The rehabilitating pipe P is connected to the segments 1 in the circumferential direction CP and the length direction LP of the rehabilitating pipe P, and the outer surfaces 3a, 4a of the first to fourth flange portions 3, 4, 5, 6 of the segment 1 5a and 6a are in contact with the outer surfaces 3a, 4a, 5a and 6a of the first to fourth flange portions 3, 4, 5 and 6 of the other segment 1, and are connected without gaps. There is no leakage. In this embodiment, the segments 1 are connected to each other by using bolts and nuts. However, other known connecting means such as an adhesive can be used as long as the segments 1 can be connected so that the segments do not leak at the connecting portion. May be used.

  Next, with reference to FIG. 4 and FIG. 5, the manufacturing method of the segment 1 of this invention is demonstrated. As described in detail below, the manufacturing method of the present invention can manufacture the segments 1 arranged in the rehabilitating pipes P of different sizes that can accommodate the existing pipes T of different diameters using a common mold 11. It is a simple method. In FIG. 4, in order to make the drawing easier to see, the protrusion 21 provided in the base 2 and the holes H and GH provided in the first to fourth flange portions 3, 4, 5, 6 are formed. The entire mold is schematically shown, such as omitting the mold part.

  According to the manufacturing method of the present invention, the segment 1 is formed using a common mold 11 and a deflection mold 16 as shown in FIG. The common mold 11 is a mold that can be used in common when manufacturing the segments 1 having different inclination angles θ of the outer surfaces 3a, 4a of the first and second flange portions 3, 4. . As shown in FIG. 4, the common mold 11 includes a mold 12 that forms the inner surface of the segment 1 and a mold 13 that forms a part of the outer surface of the segment 1. The mold 13 that forms part of the outer surface of the segment 1 forms the outer surface of the segment 1 together with the deflection mold 16 that forms the outer surfaces 3 a and 4 a of the first and second flange portions 3 and 4. In the present embodiment, as shown in FIG. 4, the common mold 11 includes an upper mold 12 as a mold 12 that forms the inner surface of the segment 1, and a mold that forms a part of the outer surface of the segment 1. The mold 13 includes a side mold 14 and a lower mold 15. The side mold 14 includes a first side mold 14a and a second side mold 14b, and the deflection mold 16 includes a first deflection mold 16a and a second deflection mold 16b. It has. The segment 1 is brought close so that the upper mold 12, the first and second side molds 14a and 14b, the lower mold 15, and the first and second deflection molds 16a and 16b do not contact each other. A molding material is injected into a space surrounded by these molds. At this time, as described above, for example, hard polyvinyl chloride, high density polyethylene (HDPE), polypropylene, or the like can be employed as the molding material. Moreover, a well-known steel material can be employ | adopted as a metal mold | die material, Other manufacturing conditions, such as the pressure in a metal mold | die, and temperature, depend on the molding material used, the shape of the segment 1 manufactured, etc. It is determined.

  As shown in FIG. 4, the upper mold 12 includes a substantially rectangular parallelepiped substrate portion 12 a and a convex portion 12 b, and a segment together with a lower mold 15 disposed at a position facing the upper mold 12. 1 base 2 is molded. The base 2 is for molding injected between the lower surface (lower surface in FIG. 4) of the convex portion 12b of the upper mold 12 and the upper surface (upper surface in FIG. 4) of the lower mold 15. Molded by material. At this time, the lower surface of the convex portion 12b of the upper mold 12 forms the inner surface 2b of the base portion 2 (the surface on which the first to fourth flange portions 3, 4, 5, and 6 are erected, see FIG. 3). The upper surface of the lower mold 15 is the outer surface 2a of the base portion 2 (the surface opposite to the surface on which the first to fourth flange portions 3, 4, 5, 6 stand up, see FIG. 3). Form. In the present embodiment, the lower surface of the convex portion 12b and the upper surface of the lower mold 15 are both substantially flat and arranged so as to be substantially parallel to each other, so that the upper mold 12 and the lower mold 15 are substantially flat. A plate-like base 2 is formed. Here, as described above, as long as the base 2 is formed in a plate shape, the base 2 may have another shape that is not substantially flat. It is designed as appropriate according to the size and shape.

  Further, as shown in FIG. 4, the upper mold 12 includes the first and second deflection molds 16 a and 16 b arranged so as to sandwich the convex portion 12 b of the upper mold 12, and the first mold of the segment 1. And the 2nd flange parts 3 and 4 are shape | molded. The first and second flange portions 3 and 4 include the side surface of the convex portion 12b of the upper mold 12 (the front right side to the left back side surface in FIG. 4) and the first and second deflection molds 16a and 16b. It is molded by molding material injected between. At this time, the side surface of the convex portion 12b of the upper mold 12 forms the inner surfaces 3b and 4b (see FIGS. 2 and 3) of the first and second flange portions 3 and 4, and the first and second deflections. The molds 16a and 16b form the outer surfaces 3a and 4a (see FIGS. 2 and 3) of the first and second flange portions 3 and 4, respectively. In this embodiment, since the side surface of the convex portion 12b is formed substantially perpendicular to the lower surface of the convex portion 12b, the inner surfaces 3b, 4b of the first and second flange portions 3, 4 are formed on the base portion 2. It is formed substantially perpendicular to it. Here, as described above, the inner surfaces 3b and 4b of the first and second flange portions 3 and 4 do not have to be substantially flat and do not have to be substantially perpendicular to the base portion 2. The shape of the side surface of the portion 12 b and the angle with respect to the lower surface of the convex portion 12 b are set according to the shape of the inner surfaces 3 b and 4 b of the first and second flange portions 3 and 4 and the angle with respect to the base portion 2.

  Further, as shown in FIG. 4, the substrate portion 12a of the upper mold 12 has angular pins 12c and 12d extending obliquely so as to spread toward the lower mold 15 as they move away from the substrate portion 12a. Is provided. The first and second deflection dies 16a and 16b are provided with engagement holes 16c and 16d that engage with the angular pins 12c and 12d, respectively. When the angular pins 12c, 12d and the engagement holes 16c, 16d are engaged with each other and the upper mold 12 moves in a direction approaching the first and second deflection molds 16a, 16b, the first and second When the upper mold 12 is moved away from the first and second deflection dies 16a and 16b, the first and second deflection dies 16a are moved. , 16b are moved in directions away from each other. As described above, the upper mold 12 includes the angular pins 12c and 12d, and the first and second deflection molds 16a and 16b include the engagement holes 16c and 16d. Since the first and second deflecting dies 16a and 16b are moved, it is not necessary to control the movement of the first and second deflecting dies 16a and 16b, and the first and second deflecting dies 16a and 16b are controlled by the injection pressure at the time of injection molding. It is possible to prevent the positions of the second deflection dies 16a and 16b from changing.

  The deflection mold 16 defines a tilt angle θ with respect to the base 2 of the outer surfaces 3a, 4a of the first and second flange portions 3, 4 of the segment 1, and has first and second flanges having a desired tilt angle θ. The outer surfaces 3a and 4a of the parts 3 and 4 are formed. In the present embodiment, the deflection mold 16 includes first and second deflection molds 16a and 16b as shown in FIG. The first and second deflecting dies 16a and 16b are each formed in a substantially rectangular parallelepiped shape, and the surfaces facing the side surfaces of the convex portion 12b of the upper die 12 are the first and second flange portions 3, 4 has an inclination angle corresponding to the inclination angle θ of the outer surfaces 3a, 4a. The deflection mold 16 can be replaced with another deflection mold 16 formed so as to correspond to the tilt angle θ according to the desired tilt angle θ. Therefore, when manufacturing the segment 1 including the first and second flange portions 3 and 4 having the outer surfaces 3a and 4a having different inclination angles θ, the cost can be reduced without exchanging the most expensive common mold 11. The segments 1 having different inclination angles θ can be easily and inexpensively made by simply exchanging only the deflection mold 16 that is not applied. In this embodiment, the deflection mold 16 is formed as an independent mold, but defines an inclination angle θ with respect to the base 2 of the outer surfaces 3a, 4a of the first and second flange portions 3, 4 of the segment 1. The outer surfaces 3a and 4a of the first and second flange portions 3 and 4 having a desired inclination angle θ need only be formed, and are formed as a deflecting member configured to be removable from the common mold 11. May be. As described above, the outer surfaces 3a and 4a of the first and second flange portions 3 and 4 may have different inclination angles θ and may not be substantially flat but may have irregularities. The deflection mold 16 is designed according to the inclination angle θ and the shape of the outer surfaces 3a and 4a of the first and second flange portions 3 and 4 to be formed.

  Further, as shown in FIG. 4, the upper mold 12 includes the first and second side molds 14 a and 14 b arranged so as to sandwich the convex part 12 b of the upper mold 12, and the first mold of the segment 1. 3 and the 4th flange parts 5 and 6 are shape | molded. The third and fourth flange portions 5 and 6 include a side surface of the convex portion 12b of the upper mold 12 (the lower left to upper right side surfaces in FIG. 4), and the first and second side molds 14a and 14b. It is molded by the molding material injected during the period. At this time, the side surface of the convex portion 12b of the upper mold 12 forms the inner surfaces 5b and 6b (see FIG. 2) of the third and fourth flange portions 5 and 6, and the first and second side molds. 14a and 14b form the outer surfaces 5a and 6a (refer FIG. 2) of the 3rd and 4th flange parts 5 and 6, respectively. In this embodiment, as shown in FIG. 4, the side surface of the convex portion 12b is formed substantially perpendicular to the lower surface of the convex portion 12b, and the convex portions of the first and second side molds 14a and 14b are formed. Since the surface facing the side surface of the portion 12b is disposed substantially parallel to the side surface of the convex portion 12b, the third and fourth flange portions 5 and 6 are erected substantially perpendicular to the base portion 2. To be molded. As described above, the third and fourth flange portions 5 and 6 do not have to be erected substantially perpendicular to the base portion 2, so that the angle of the side surface of the convex portion 12 b, the first and second The angles of the surfaces of the side molds 14a, 14b facing the side surface of the convex portion 12b are set according to the shapes and sizes of the third and fourth flange portions 5, 6 to be molded. The first and second molds 14a and 14b are configured to move independently in the present embodiment. However, similarly to the first and second deflection molds 16a and 16b, the angular pins and You may be comprised so that it may interlock | cooperate with the upper metal mold | die 12 by providing an engagement hole.

  The manufacturing method of the present invention using the mold 10 described above includes a step of calculating the inclination angle θ of the segment 1 according to the radius R of the existing pipe T. Here, for example, the base 2 of the segment 1 is flat, the outer surfaces 3a, 4a of the first and second flange portions 3, 4 have the same inclination angle θ, and the first and second flange portions 3, When both 4 have the same height, the number of segments 1 used to form the rehabilitation pipe P is n, the width of the base 2 in the circumferential direction CP of the rehabilitation pipe P is a, and the regenerative pipe P in the radial direction When the height of the segment 1 is b and the radius of the circle connecting all the vertices of the polygon of the cross section of the rehabilitation pipe P is r (see FIG. 5), the following relational expressions (1) and (2) hold.

  Using formulas (1) and (2), a and b are set to predetermined values, and by obtaining the maximum integer n in which the radius r of the rehabilitated pipe P is smaller than the radius R of the existing pipe T, the inclination angle θ is determined. Can be calculated. For example, if R is 150 cm (diameter 3 m), a is 20 cm, and b is 5 cm, n is calculated as 45, θ is 4 °, and r is approximately 148 cm. The method of calculating the inclination angle θ is not limited to this method. If the shape of the segment 1 is different from the above assumption, it may be calculated by another method such as using another relational expression corresponding to the shape. it can.

  The manufacturing method of the present invention further includes a step of providing a deflection mold 16 according to the calculated inclination angle θ. In this step, the deflection mold 16 is provided and arranged with respect to the common mold 11. In the present embodiment, the deflection mold 16 is provided as first and second deflection molds 16a and 16b as shown in FIG.

  In the manufacturing method of the present invention, the upper mold 12, the side mold 14, the lower mold 15 and the deflection mold 16 are brought close to each other so as not to contact each other, and then are formed in a space surrounded by these molds. A step of injecting the material. Thereby, the segment 1 for forming the rehabilitation pipe | tube P which has a magnitude | size corresponding to the radius R of the existing pipe | tube T can be manufactured.

  As described above, according to the manufacturing method of the present invention, the segment 1 that forms the rehabilitation pipe P having a size corresponding to the existing pipe T having different radii R can be changed without changing the common mold 11. Since it can be made by simply replacing the deflection die 16, it is not necessary to change the entire die as in the conventional case, and the manufacturing cost can be greatly reduced, and the segment 1 can be easily produced. can do.

  Next, with reference to FIG. 6 and FIG. 7, the rehabilitation pipe | tube P of this invention using the segment 1 is demonstrated.

  The rehabilitation pipe P using the segment 1 of the present invention is formed by arranging a plurality of segments 1 having the same width a of the base 2 in the circumferential direction CP of the rehabilitation pipe P as shown in FIG. Furthermore, the width “a” of the base portion 2 is changed by changing the inclination angle θ of the outer surfaces 3a and 4a of the first and second flange portions 3 and 4 of the segment 1 even for the existing pipe T having different radii R. The same segment 1 forms rehabilitation pipes P having different radii r. FIG. 6 shows an embodiment of a rehabilitation pipe P having a different radius r, formed to correspond to an existing pipe T having a different radius R. When the radius R of the existing pipe T is small, as shown in FIG. 6A, the inclination angle θ of the outer surfaces 3a, 4a of the first and second flange portions 3, 4 is increased (θ = θ1, see FIG. 7A), by reducing the number n of segments 1, the rehabilitation pipe P having a small radius r can be formed. On the other hand, when the radius R of the existing pipe T is large, as shown in FIG. 6B, the inclination angle θ of the outer surfaces 3a, 4a of the first and second flange portions 3, 4 is reduced ( θ = θ2, see FIG. 7B), and by increasing the number n of segments 1, the rehabilitation pipe P having a large radius r can be formed. Thus, the rehabilitation pipe P of the present invention can change the radius r by only changing the inclination angle θ of the outer surfaces 3a, 4a of the first and second flange portions 3, 4 of the segment 1. Therefore, even if the radius R of the existing pipe T changes, the segment 1 manufactured using the common mold 11 can be used. Therefore, the rehabilitation pipe P of the present invention can be formed at a low cost.

  Here, if the width a of the base 2 is the same, and the rehabilitation pipe P is formed using a number n of segments 1, the width a of the base 2 and the segment 1 can be seen from the above-described formulas (1) and (2). A rehabilitating tube P having a radius r corresponding to the number n of is formed. Since the number n of segments 1 is an integer, the radius r of the rehabilitation pipe P to be formed increases discontinuously as the number n of segments 1 increases. In other words, depending on the combination of the width a of the base 2 and the number n of segments 1, the difference between the radius r of the rehabilitated pipe P and the radius R of the existing pipe T may not be suppressed within an allowable range. Since the difference between the radius r of the rehabilitated pipe P and the radius R of the existing pipe T appears significantly when the radius R of the existing pipe T decreases, the range in which the radius R of the existing pipe T can be handled is relatively large. There is a possibility that it will be limited to. In such a case, in order to finely adjust the radius r of the rehabilitation pipe P to be formed and to reduce the difference between the radius r and the radius R, at least two types of segments 1 having different widths a of the base 2 are used. It is preferable to arrange and form the rehabilitation pipe P. Since the radius R of the existing pipe T rehabilitated by the rehabilitation pipe P has various values, the radius of the rehabilitation pipe P obtained by disposing at least two types of segments 1 having different base 2 widths. r can be finely adjusted, and the applicable range of the radius R of the existing pipe T can be increased. For example, assuming that the width a of the base 2 of the segment 1 is 20 cm, the height b of the segment 1 is 5 cm, and the radius R of the existing pipe T is assumed to be the largest 250 cm (diameter 5 m), the above formula (1 ), (2), the number n of segments 1 is 76, and the radius r of the rehabilitation pipe P is calculated to be about 247 cm. In this case, the difference between the radius R of the existing pipe T and the radius r of the renovated pipe P is about 3 cm, and the ratio of the existing pipe T to the radius R is about 1.2%. Generally, since the allowable ratio in the rehabilitation of the existing pipe T is about 3%, the difference of this level is a sufficiently allowable range. Conversely, assuming that the radius R of the existing pipe T is the smallest 50 cm (1 m in diameter), the number n of segments 1 is 13 from the above formulas (1) and (2). Is calculated to be about 47 cm. In this case, the difference between the radius R of the existing pipe T and the radius r of the renovated pipe P is about 3 cm, and the ratio of the existing pipe T to the radius R is about 6%. As described above, when the radius R of the existing pipe T is reduced, the ratio of the difference between the radius R and the radius r is increased. However, by adding one segment 1 having a base 2 width of 10 cm, the radius r is reduced. It is calculated as about 48.5 cm from another calculation formula, and the difference ratio is halved to about 3%. Although these calculation results are merely examples, the range in which the radius R of the existing pipe T can be handled is increased by using at least two types of segments 1 having different base 2 widths. At this time, the range of the radius R of the existing pipe T that can be accommodated by using the segment 1 having the base 2 having as many kinds of widths a as possible increases, but conversely, in order to increase the types of the width a of the base 2 This increases the number of molds 11 and increases costs. Therefore, it is preferable to determine the width a of the base 2 and the number of types in consideration of the range of the radius R of the corresponding existing pipe T and the manufacturing cost.

DESCRIPTION OF SYMBOLS 1 Segment 2 Base 21 Protrusion 2a Outer surface of base 2b Inner surface of base 3 First flange portion 3a Outer surface of first flange portion 3b Inner surface of first flange portion 4 Second flange portion 4a Outer surface of second flange portion 4b The inner surface of the second flange portion 5 The third flange portion 5a The outer surface of the third flange portion 5b The inner surface of the third flange portion 6 The fourth flange portion 6a The outer surface of the fourth flange portion 6b The fourth flange portion Inner surface 10 mold 11 common mold 12 mold forming upper surface of segment, upper mold 12a substrate portion 12b convex portion 12c, 12d angular pin 13 mold forming part of outer surface of segment 14 side portion Mold 14a First side mold 14b Second side mold 15 Lower mold 16 Deflection mold 16a First deflection mold 16b Second deflection mold 16c, 16d Hole a Base width b Segment height CP Circumferential direction of rehabilitated pipe CT Circumferential direction of existing pipe GH Hole H Hole LP Length of rehabilitated pipe LT Length direction of existing pipe P Rehabilitated pipe R Radius of existing pipe r Rehabilitation Pipe radius T Existing pipe θ Inclination angle

Claims (5)

Inside the existing pipe having a substantially circular cross section, a plurality of segments arranged in the circumferential direction and the length direction of the existing pipe and used for the rehabilitation pipe having a polygonal cylindrical shape for rehabilitating the existing pipe are injected using a mold. A method of manufacturing by molding,
The segment includes a plate-like base portion constituting a part of the inner peripheral surface of the rehabilitation pipe, a first flange portion erected from one side edge of the base portion, and substantially parallel to one side edge of the base portion. At least a second flange portion erected from the other side edge, and the first flange portion and the outer surface of the second flange portion are inclined and erected so as to spread from each other as they move away from the base portion. ,
The outer surface of the first flange portion has a plurality of segments arranged in the circumferential direction of the existing pipe, and when the rehabilitated pipe is formed, the outer surface of another segment adjacent in the circumferential direction of the rehabilitated pipe is formed. 2 is in contact with the outer surface of the flange,
The segment is
Molded using a common mold and deflection mold,
The method comprises
Calculating an inclination angle of the outer surfaces of the first and second flange portions with respect to the base according to the diameter of the existing pipe;
Providing the deflection mold according to the tilt angle;
A step of injecting a molding material,
A method capable of manufacturing segments arranged in rehabilitating pipes of different sizes that can accommodate existing pipes of different diameters using a common mold. The common mold is
An upper mold for forming the inner surface of the base and the inner surfaces of the first and second flange portions;
A lower mold for forming the outer surface of the base,
The deflection mold is
The method of claim 1, further comprising a first deflection mold and a second deflection mold for forming each of the outer surfaces of the first and second flange portions. A rehabilitated pipe manufactured by the method according to claim 1 or 2, wherein at least two types of segments having the same base width or different base widths are disposed. A rehabilitation pipe which is provided inside an existing pipe having a substantially circular cross section and rehabilitates the existing pipe,
The rehabilitation pipe includes a plurality of segments arranged in a circumferential direction and a length direction of the existing pipe,
The segment includes a plate-like base portion constituting a part of the inner peripheral surface of the rehabilitation pipe, a first flange portion erected from one side edge of the base portion, and substantially parallel to one side edge of the base portion. At least a second flange portion erected from the other side edge, and the first flange portion and the outer surface of the second flange portion are inclined and erected so as to spread from each other as they move away from the base portion. ,
The outer surface of the first flange portion has a plurality of segments arranged in the circumferential direction of the existing pipe, and when the rehabilitated pipe is formed, the outer surface of another segment adjacent in the circumferential direction of the rehabilitated pipe is formed. 2 is in contact with the outer surface of the flange,
A rehabilitation pipe formed in a polygonal cylindrical shape by arranging a plurality of the segments in a circumferential direction and a length direction of the existing pipe. The rehabilitation pipe according to claim 4, wherein at least two types of segments having different widths of the base portion are disposed.

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