JP2014040871A - Covered pipe line, its construction method, and cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a covered pipe line suitably usable for an environment exposed to the outside and excellent in workability, and to provide its construction method and a cover.SOLUTION: A covered pipe line 10 is formed by connecting covered polyethylene pipes 12 to each other with an electrically fused joint 14 and covering the whole connection part with a cover 16. The cover 16 includes a cylindrical body cover 36 molded as an integrated object in the circumferential direction, and a first cover part 40 of the body cover 36 covers the outer face of the electrically fused joint 14. At each end in the axial direction of the body cover 36, a cylindrical end cover 38 is provided which is molded as an integrated object in the circumferential direction. The end cover 38 consisting of a diameter-shrunk part 42 and a small-diameter part 44 covers a clearance between the body cover 36 and a cover layer 20 left on each covered polyethylene pipe 12, and it is fixed onto the outer face of the cover layer 20 on each covered polyethylene pipe 12 with a fastening tool 52. The covered pipe line can be suitably used in such circumstances that the covered pipe line is exposed to the outside because it can avoid a trouble such as cover falling-off, and weather resistance can be imparted to the whole covered pipe line with simple work.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated pipe line, its construction method, and a cover, and in particular, for example, a coated pipe line and its construction method in which clad pipe members are connected to each other by an electric fusion joint, , And cover.

  Conventionally, a technique for applying a coating layer to the outer peripheral surface of a polyethylene pipe in order to prevent damage to the polyethylene pipe or deterioration due to ultraviolet rays or the like is known. When connecting the coated polyethylene pipes formed in this way using a joint, it is required to coat the outer surface of the joint as well as the polyethylene pipe.

For example, in the pipe connection structure of Patent Document 1, the outer peripheral surface of the joint main body of the electric fusion joint is covered with a cover member. The cover member is formed by coupling a first cover part and a second cover that are semicylindrical to each other. An end portion of each cover portion is provided with a flange portion extending in the axial direction, and a heating wire for fusing with the tube member is embedded in the flange portion. Then, by sandwiching the joint main body between the first cover part and the second cover part, the cover parts are mechanically coupled to each other, and the flange portion (the heating wire) of each cover part is fused to the pipe member. The cover member is fixedly attached to the joint body.
JP2008-19971 [F16L 47/02]

  However, in Patent Document 1, not only the joint body is fused to the pipe member, but also the flange portion of each cover portion is fused to the pipe member, so two energization (fusion) operations are required. And it takes time and effort for the work. That is, there is a difficulty in workability.

  On the other hand, in order to avoid this, if the first cover portion and the second cover portion are attached to the joint body only by mechanical coupling without fusing the flange portion of each cover portion to the pipe member. The cover member itself becomes very weak against an impact from the outside, and it is easy to cause problems such as dropout in each cover part, so it is difficult to use in an environment where the pipe connection structure is exposed to the outside. .

  Therefore, the main object of the present invention is to provide a novel coated pipe line, its construction method, and a cover.

  Another object of the present invention is to provide a coated pipe, its construction method, and a cover that can be suitably used in an environment exposed to the outside and is excellent in workability.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  1st invention removes the coating layer of the pipe end part used for joining of the coated pipe member which coat | covered the outer peripheral surface of the pipe member which consists of synthetic resins with the coating layer, and connects the pipe end parts by an electrofusion joint A cover that is fixed in a state of covering a range from the coating layer of one cladding tube member to the coating layer of the other cladding tube member, and the cover is formed from the outer shape of the electric fusion joint. A first covering portion that covers the surface of the electric fusion joint, one end is provided at the end of the first covering portion, and is formed between the electric fusion joint and the cladding tube member A reduced diameter portion having a cylindrical shape corresponding to the step to be formed, and a cylindrical shape integrally formed at the other end of the reduced diameter portion and having an inner diameter larger than the outer diameter of the cladding tube member and smaller than the inner diameter of the first covering portion It is a covering pipe line containing a small diameter part which has.

  In the first invention, the cladding pipe line (10) is formed by connecting the cladding pipe members (12) to each other by the electric fusion joint (14), and from the coating layer (20) of one cladding pipe member to the other cladding pipe. It is formed by covering the area of the member up to the covering layer with a cover (16). For example, the cover includes a cylindrical first covering portion (40) formed as a single piece in the circumferential direction. The first covering portion has a cylindrical shape having an inner diameter larger than the outer shape of the electrofusion joint, and covers the outer surface of the electrofusion joint. Further, for example, a reduced diameter portion (42) and a small diameter portion (44) formed as a single body in the circumferential direction are provided at the end portion in the axial direction of the first covering portion. The reduced diameter portion is provided so that one end thereof is in contact with the axial end portion of the first covering portion, and has a cylindrical shape corresponding to the step (50) generated between the outer surface of the cladding tube member and the outer surface of the electrofusion joint. have. The small diameter portion is formed integrally with the other end of the reduced diameter portion, extends outward in the axial direction from the reduced diameter portion, and is fixed on the outer surface of the coating layer remaining on the cladding tube member by a fastening tool (52) or the like. The

  According to the first aspect of the invention, the cover is configured by the cylindrical portions formed as an integral object in the circumferential direction, so that problems such as the falling off of the cover can be avoided. Therefore, it can be suitably used even in an environment where the cladding pipe line is exposed to the outside.

  Furthermore, after combining the respective parts of the cover, weather resistance can be imparted to the entire pipe line by a simple operation that is simply fixed on the outer surface of the covering layer of the covering tube member, so that the workability is excellent.

  The second invention is dependent on the first invention, and the cover is arranged so as to be axially movable on the outer surface of the coating layer of the cladding tube member before the cladding tube members are connected to each other by the electric fusion joint. After the cladding tube members are connected to each other by the electric fusion joint, they are moved in the direction of the electric fusion joint to cover the range from the coating layer of one cladding tube member to the coating layer of the other cladding tube member. It is fixed in the state.

  In the second invention, each part of the cover (16) is pivoted on the outer surface of the coating layer (20) of the cladding tube member before the cladding tube members (12) are connected to each other by the electric fusion joint (14). It is arranged to be movable in the direction. Then, after the cladding tube members are connected to each other by the electric fusion joint, each part of the cover (16) is moved in the direction of the electric fusion joint, and the cover is moved from the coating layer of the one cladding tube member to the other cladding tube. It fixes in the state which coat | covered the range to the coating layer of a member.

  The third invention is dependent on the first or second invention, and a reduced diameter portion is provided at each of both ends of the first covering portion, and at least one of the reduced diameter portions is separable from the first covering portion. Is provided.

  In the third invention, the diameter-reduced portion (42) is provided at each axial end portion of the first covering portion (40), and one or both of the diameter-reduced portions can be separated from the first covering portion. Thus, the cover (16) can be easily attached.

  A fourth invention is dependent on any one of the first to third inventions, and one end of the reduced diameter portion has a receiving shape for receiving the end portion of the first covering portion.

  In the fourth invention, the reduced diameter portion (42) includes a short cylindrical portion (46) formed in a short cylindrical shape having a slightly larger diameter than the first covering portion (40), and when the cover (16) is mounted. The end portion of the first covering portion is received inside the short cylindrical portion.

  According to the fourth invention, since the cover can be formed in a simple shape, the manufacturing cost can be reduced accordingly.

  5th invention removes the coating layer of the pipe end part used for joining of the coated pipe member which coat | covered the outer peripheral surface of the pipe member which consists of synthetic resins with the coating layer, and connects the pipe end parts by an electrofusion joint A cover that is fixed in a state of covering a range from the coating layer of one cladding tube member to the coating layer of the other cladding tube member, and the cover is formed from the outer shape of the electric fusion joint. A second covering portion having a cylindrical shape with a larger inner diameter and having ring grooves formed on the inner surface sides of both ends, and an inner surface of the second covering portion and a covering layer of each cladding tube member disposed inside the ring groove It is a covering pipe line containing the obturator which plugs up the space between.

  In the fifth invention, the cladding pipe line (10) connects the cladding pipe members (12) to each other by the electric fusion joint (14), and the other cladding pipe from the coating layer (20) of one cladding pipe member. It is formed by covering the area of the member up to the covering layer with a cover (16). For example, the cover includes a second covering (66) and two closure members (64) disposed on the outer surface of the electrofusion joint. The 2nd coating | coated part has a cylindrical shape with an internal diameter larger than the external shape of an electrofusion joint, and a ring groove (68) is formed in the inner surface side of the both ends. Further, the closing member is, for example, a C-ring having a circular cross section, and is disposed inside the ring groove of the second covering portion, between the outer surface of the covering layer remaining on the cladding tube member and the inner surface of the second covering portion. To close the gap.

  According to the fifth aspect, the same effect as the first aspect is achieved.

  A sixth invention is dependent on any one of the first to fifth inventions, wherein the electric fusion joint includes a terminal portion that protrudes from the outer surface of the receiving port and energizes the heating wire. It includes a terminal accommodating portion that is formed over the entire axial length of the first covering portion or the second covering portion and that accommodates the terminal portion.

  In 6th invention, the protrusion-shaped terminal part (32) connected with the heating wire (28) is formed in the outer surface of the coupling main body (24) of an electrofusion joint (14). On the other hand, for example, a terminal accommodating portion (82) is formed in the first covering portion (40) of the cover (16). For example, the terminal accommodating portion is formed by recessing the inner surface side of the first covering portion into a shape capable of accommodating the terminal portion of the electrofusion joint, and is formed over the entire axial length of the first covering portion. . When the cover is moved, the terminal part of the electrofusion joint is inserted into the terminal accommodating part, and the terminal part is accommodated in the terminal accommodating part as it is.

  According to the sixth aspect of the present invention, it is not necessary to remove the terminal portion, the indicator, and the like of the electric fusion joint after the fusion bonding, so that the workability can be further improved.

  7th invention is the construction method of the coated pipe line of any one of 1st thru | or 5th invention, Comprising: (a) The step which removes the coating layer of the pipe end part used for joining of a coated pipe member, (b) A step of disposing the cover on the outer surface of the covering layer of the covering tube member so as to be axially movable; (c) after step (b), the tube ends of the covering tube member from which the covering layer is removed in step (a) (D) After step (c), the cover disposed on the outer surface of the coating layer of the cladding tube member is moved in the direction of the electric fusion joint. A step of covering the range from the coating layer of one cladding tube member to the coating layer of the other cladding tube member with a cover, and (e) after step (d), on the outer surface of the coating layer of the cladding tube member The step of fixing the small diameter part of the cover with the fastening tool No, it is a construction method.

  In 7th invention, in a step (a), two cladding tube members (12) are prepared and the coating layer (20) of the tube end part used for joining of each cladding tube member is removed. In step (b), the cover (16) is disposed on the outer surface of the coating layer of the cladding tube member so as to be movable in the axial direction. In step (c), the tube end portion of the cladding tube member is inserted into the receiving port (26) of the electric fusion joint (14) and fusion-bonded. In step (d), after the cladding tube members are fusion-bonded together, the cover disposed on the outer surface of the coating layer of the cladding tube member is moved to the position of the electric fusion joint, and one of the cladding tube members is moved by the cover. The range from the coating layer to the coating layer of the other cladding tube member is coated. In step (e), the small diameter portion (44) of the cover is fixed on the outer surface of the coating layer of the cladding tube member by the fastening tool (52).

  8th invention is the construction method of the covering pipe line of 3rd or 4th invention, Comprising: (a) The step which removes the coating layer of the pipe end part used for joining of a covering pipe member, (b) One covering On the outer surface of the covering layer of the tube member, the first covering portion of the cover and one of the reduced diameter portion and the small diameter portion are disposed so as to be movable in the axial direction, and on the outer surface of the other covering tube member, (C) Step (b), Step (b), Step (a), Step (a) and then removing the coating layer between the tube ends of the tube member A step of fusion-bonding by a joint; (d) after step (c), a step of moving the first covering portion disposed on the outer surface of one cladding tube member to the position of the electric fusion joint in step (b) (E) One reduced diameter portion and small diameter portion and the other on the first covering portion A step of covering a range from the coating layer of one cladding tube member to the coating layer of the other cladding tube member by combining the reduced diameter portion and the small diameter portion; and (f) the cover after step (e) It is the construction method including the step which fixes each small diameter part of this to the outer surface of the coating layer of a cladding tube member with a clamp.

  In 8th invention, in a step (a), two cladding tube members (12) are prepared and the coating layer (20) of the tube end part used for joining of each cladding tube member is removed. In step (b), the first covering portion (40) of the cover (16) and the one reduced diameter portion (42) and the small diameter portion (44) can be moved in the axial direction on the outer surface of one of the cladding tube members. While arrange | positioning, the other diameter reduction part and small diameter part of a cover are arrange | positioned so that a movement in an axial direction is possible on the outer surface of the other cladding tube member. In step (c), the tube end portion of the cladding tube member is inserted into the receiving port (26) of the electric fusion joint (14) and fusion-bonded. In step (d), after the cladding tube members are fused and joined, the first coating portion disposed on the outer surface of one of the cladding tube members is moved to the position of the electrofusion joint. In step (e), the first covering portion is combined with the reduced diameter portion and the small diameter portion to form a cover, and the cover covers the range from the covering layer of one covering tube member to the covering layer of the other covering tube member. To do. In step (f), the small-diameter portion of the cover is fixed on the outer surface of the covering layer of each cladding tube member by the fastening tool (52).

  9th invention is a cover fixed in the state which coat | covered the range from the outer layer of one cladding tube member to the outer layer of the other cladding tube member in the cladding pipe line of either invention of 1st thru | or 6. .

  In the ninth invention, the cover (16) covers the entire connecting portion where the cladding tube members (12) are connected to each other by the electric fusion joint (14). For example, the cover (16) covers the surface of the electric fusion joint. The first covering part (40) or the second covering part (66) is provided. A reduced diameter portion (42) is detachably provided at both axial end portions of the first covering portion. The reduced diameter portion has a cylindrical shape corresponding to a step (50) formed between the electrofusion joint and the cladding tube member, and a small diameter portion (40) is provided at the outer end in the axial direction. Are integrally formed. The small diameter portion is fixed on the outer surface of the covering layer of each cladding tube member by a fastening tool (52) or the like.

  A tenth aspect of the present invention is a cover fixed to a pipe in which two pipe members are connected by a pipe joint so as to cover a range from one pipe member to the other pipe member. A cylinder with a large inner diameter, provided at each end of the first cover and the first cover that covers the surface of the pipe joint, and corresponding to the step formed between the pipe joint and the pipe member A reduced-diameter portion having a shape, and a small-diameter portion formed integrally with the reduced-diameter portion and having a cylindrical shape with an inner diameter larger than the outer diameter of the tube member and smaller than the inner diameter of the first covering portion, and at least one of them The reduced diameter portion is a cover provided so as to be separable from the first covering portion.

  In the tenth invention, the cover (16) covers a range from one pipe member to the other pipe member in a pipe in which the pipe members are connected by a pipe joint, and is integrally formed in the circumferential direction. A molded cylindrical first covering portion (40) is provided. The first covering portion has a cylindrical shape with an inner diameter larger than the outer shape of the pipe joint, and covers the outer surface of the pipe joint. Moreover, the diameter-reduced part (42) and the small diameter part (44) which were shape | molded as an integral thing in the circumferential direction are provided in the both ends of the axial direction of a 1st coating | coated part, respectively. The reduced diameter portion is provided so that one end thereof is in contact with the axial end portion of the first covering portion, and has a cylindrical shape corresponding to a step formed between the pipe member and the pipe joint. The reduced diameter portion is separable from the first covering portion. The small diameter portion is formed integrally with the other end of the reduced diameter portion, extends outward in the axial direction from the reduced diameter portion, and is fixed on the outer surface of the pipe member by, for example, a fastening tool (52).

  According to the tenth aspect of the invention, the cover is constituted by the cylindrical portions molded as a single piece in the circumferential direction, so that it is possible to avoid problems such as falling off of the cover.

  Furthermore, after combining the parts of the cover, etc., by simply fixing on the outer surface of the pipe member, it is possible to prevent freezing and dew condensation of the pipe connection part, and to insulate and heat the connection part. So workability is excellent.

  An eleventh aspect of the present invention is a cover fixed to a pipe in which two pipe members are connected by a pipe joint so as to cover a range from one pipe member to the other pipe member. A cylindrical shape with a large inner diameter, and a second covering portion that covers the surface of the pipe joint, a ring groove formed on each of the inner surfaces of both end portions of the second covering portion, and an inner portion of the ring groove; It is a cover provided with the obstruction | occlusion member which block | closes the space between the inner surface of a coating | coated part, and the outer surface of each pipe member.

  In the eleventh invention, the cover (16) covers a range from one pipe member to the other pipe member in the pipe in which the pipe members are connected by the pipe joint, and is arranged on the outer surface of the pipe joint. The second covering portion (66) and the two closing members (64) are provided. The second covering portion has a cylindrical shape having an inner diameter larger than the outer shape of the pipe joint, and ring grooves (68) are formed on the inner surface sides of both end portions. The closing member is, for example, a C-ring having a circular cross section, and is disposed inside the ring groove of the second covering portion, and closes the gap between the inner surface of the second covering portion and the outer surface of the tube member.

  According to the eleventh aspect, the same effect as in the tenth aspect is obtained.

  According to the present invention, since the cover is configured by the cylindrical portions formed as a single body in the circumferential direction, problems such as the falling off of the cover can be avoided.

  Furthermore, after combining the parts of the cover, etc., simply by fixing it on the outer surface of the pipe member, it gives weather resistance to the entire pipe line, prevents freezing and condensation on the pipe connection part, Since the heat insulation and heat insulation of the connection part can be performed, it is excellent in workability.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is sectional drawing which shows the covering pipe line of one Example of this invention. (A) is a perspective view which shows the covering polyethylene pipe | tube of FIG. 1, (b) is a perspective view which shows a mode that the outer layer of the part corresponded to the junction part of FIG. 1 covering polyethylene pipe | tube was removed. (A) is a top view which shows the electrofusion joint of FIG. 1, (b) is sectional drawing which shows the electrofusion joint of FIG. It is an illustration figure which shows the cover of FIG. It is sectional drawing which shows the cover of FIG. It is an illustration figure which shows a mode that the cladding pipe line of FIG. 1 is formed. It is sectional drawing which shows the cladding pipe line of another Example of this invention. It is an illustration figure which shows the cover of FIG. It is sectional drawing which shows the cover of FIG. It is an illustration figure which shows a mode that the cladding pipe line of FIG. 7 is formed. It is sectional drawing which shows the cladding pipe line of another Example of this invention. It is an illustration figure which shows a mode that the cladding pipe line of another Example of this invention is formed. It is an illustration figure which shows a mode that the cladding pipe line of another Example of this invention is formed. It is sectional drawing which shows the cladding pipe line of another Example of this invention. It is sectional drawing which shows the main body cover in the cover of FIG. (A) is a perspective view which shows the ring member in the cover of FIG. 14, (b) is sectional drawing which shows the ring member in the cover of FIG. It is an illustration figure which shows a mode that the cladding pipe line of FIG. 14 is formed. It is an illustration figure which shows a mode that the cladding pipe line of another Example of this invention is formed. It is sectional drawing which shows the cladding pipe line of another Example of this invention. It is an illustration figure which shows the cover of FIG. It is sectional drawing which shows the cover of FIG.

  Referring to FIG. 1, a coated pipe line 10 according to an embodiment of the present invention is formed by connecting coated polyethylene pipes 12 with an electric fusion joint 14 and covering the entire connecting portion with a cover 16. Is done.

  First, an outline of the coated polyethylene pipe 12 and the electrofusion joint 14 will be described.

  As shown in FIG. 2A, the coated polyethylene pipe 12 is a conduit for gas and water including an inner pipe 18 and a coating layer 20 that covers the outer peripheral surface of the inner pipe 18.

  The inner pipe 18 is a fixed pipe having a predetermined length (for example, 5 m), is formed of a polyolefin-based resin such as polyethylene, and is set to a predetermined diameter and thickness. The covering layer 20 is made of, for example, low density polyethylene or the like, and is provided with weather resistance in order to prevent the inner tube 18 from being deteriorated by ultraviolet rays or the like. The coating layer 20 is provided over and covers the entire outer peripheral surface of the inner tube 18, and the thickness thereof is, for example, 1.5 mm. The covering layer 20 may be composed of a plurality of layers in which layers are stacked. And as shown in FIG.2 (b), the fusion | melting surface for favorable joining is removed by removing the coating layer 20 of the pipe | tube end part used for joining when fusion-joining with the electrical fusion joint 14 and joining. 22 can be obtained.

  Since such a coated polyethylene tube 12 can be manufactured by a conventionally known method, a detailed description of the manufacturing method is omitted. In short, it is manufactured by coating the outer peripheral surface of the inner tube 18 by co-extrusion of the coating layer 20 with respect to the inner tube 18 previously extruded alone.

  The electrofusion joint 14 is for connecting the two coated polyethylene pipes 12 in a straight line, and includes a socket-type joint body 24 formed of a polyolefin-based synthetic resin such as polyethylene.

  As shown in FIGS. 3A and 3B, the joint body 24 is formed in a cylindrical shape, for example. Both ends of the joint body 24 are openings 26 for receiving the pipe ends of the coated polyethylene pipe 12, and heating wires 28 are embedded in the inner surfaces thereof. The inner diameter of the receiving port 26 is 126 mm, for example. A stopper 30 for stopping the pipe end of the coated polyethylene pipe 12 is formed on the inner surface of the joint body 24 on the inner side of the heating wire 28, that is, on the inner surface of the central part of the joint body 24.

  The protrusion formed on the outer surface of the joint body 24 is a terminal portion 32 connected to the heating wire 28, and on the center side of the terminal portion 32, the inner surface of the receiving port 26 and the coated polyethylene pipe 12 are fused. An indicator 34 is formed to indicate that the landing surface 22 has been fused. The indicator 34 is raised by the pressure of the resin melted by the heating wire 28 acting on its own base, and the inner surface of the receiving port 26 and the fused surface 22 of the coated polyethylene pipe 12 are correctly fused. It is used as a guide.

  For example, when the inner surface of the receiving port 26 and the fused surface 22 of the coated polyethylene tube 12 are fused, the tube end of the coated polyethylene tube 12 is inserted into the receiving port 26 of the joint body 24 until it contacts the stopper 30. Thereafter, the heating wire 28 is energized through the terminal portion 32 from the controller.

  Next, the outline of the cover 16 will be described with reference to FIGS. 1, 4, and 5.

  The cover 16 prevents the connection portion between the coated polyethylene pipe 12 and the electrofusion joint 14 from being deteriorated by ultraviolet rays or the like, and the entire connection portion, that is, the coating layer 20 of one coated polyethylene tube 12 to the other. The range up to the coating layer 20 of the coated polyethylene tube 12 is covered. The cover 16 is made of a synthetic resin such as low density polyethylene, and is formed by combining a body cover 36 and two end covers 38 that are separable from each other.

  The main body cover 36 includes a cylindrical (sleeve-shaped) first covering portion 40, and is molded as an integral body by extrusion molding or the like. The first covering portion 40 has a cylindrical shape having an inner diameter larger than the outer shape of the electric fusion joint 14 and is disposed on the outer surface of the electric fusion joint 14 when the cover 16 is attached. A coating layer covering 14 outer surfaces is formed.

  As will be described in detail later, in this embodiment, the terminal portions 32 of the electrofusion joint 14 are removed (removed) after the coated polyethylene pipes 12 are fused together. The outer shape of the joint 14 is substantially the same as the outer shape of the joint body 24, and the inner diameter of the first covering portion 40 is also set to be equal to or slightly larger than the outer diameter of the joint body 24 of the electrofusion joint 14. . The internal diameter of the 1st coating | coated part 40 is 160 mm, for example. Further, the axial length of the first covering portion 40 is set to a dimension equal to or larger than the axial length of the electrofusion joint 14 and is, for example, 160 mm, and the thickness thereof is, for example, 1.5 mm. is there.

  Further, the end cover 38 includes a cylindrical (sleeve-shaped) reduced diameter portion 42 and a small diameter portion 44, and is formed as an integral body by injection molding or the like. The end covers 38 are provided at both end portions of the main body cover 36 in the axial direction, and cover the gap formed between the main body cover 36 and the coating layer 20 remaining on the coated polyethylene pipe 12 when the cover 16 is mounted. A coating layer is formed.

  The reduced diameter portion 42 is provided so that one end thereof is in contact with the end portion of the first covering portion 40 (in the axial direction thereof). The reduced diameter portion 42 is formed between the outer surface of the coated polyethylene tube 12 and the outer surface of the joint body 24 of the electrofused joint 14 when the receiving port 26 of the electrofused joint 14 receives the tube end of the coated polyethylene tube 12. It has a cylindrical shape corresponding to the step 50 produced.

  For example, in this embodiment, the reduced diameter portion 42 includes the short cylindrical portion 46 and has a receiving structure. The short cylindrical portion 46 is formed in a short cylindrical shape having a slightly larger diameter than the first covering portion 40 of the main body cover 36, and the end portion of the first covering portion 40 is received inside the short cylindrical portion 46. A donut plate portion 48 that covers the opening end of the receiving port 16 of the electrofusion joint 14 is integrally formed at the axially outer end of the short cylindrical portion 46. The donut plate portion 48 is formed in a donut plate shape having an opening at the center, and protrudes radially inward from the short cylindrical portion 46 in a step-down manner. The donut plate portion 48 also functions as a stopper for the end portion of the first covering portion 40 when the end portion of the first covering portion 40 is received inside the short cylindrical portion 46.

  Further, a small diameter portion 44 is integrally formed at the other end of the reduced diameter portion 42, that is, at the inner peripheral edge of the donut plate portion 48. The small diameter portion 44 is formed in a short cylindrical shape having an inner diameter larger than the outer diameter of the coating layer 20 of the coated polyethylene tube 12 and smaller than the inner diameter of the first coating portion 40, and extends from the reduced diameter portion 42 to the outside in the axial direction. Then, the fused surface 22 of the coated polyethylene pipe 12 exposed outside the electric fusion joint 14 is covered. When the cover 16 is mounted, the cover 16 is fixed on the outer surface of the coating layer 20 remaining on the coated polyethylene pipe 12 by a fastening tool 52 such as a wire or a fastening band, as will be described in detail later. For example, the inner diameter of the small diameter portion 44 is 130 mm. Further, the axial length of the small diameter portion 44 is, for example, 20 mm, and the thickness thereof is, for example, 1.5 mm.

  With reference to FIG. 1 and FIG. 6, the method of constructing such a coated conduit 10 will be described below.

  First, two coated polyethylene pipes 12 are prepared. Then, using a cutter knife, a dedicated tool for removing the coating layer (not shown) or the like, a cut is made on the surface of the coating layer 20 of the coated polyethylene tube 12, and the coating layer 20 is torn off and removed (removed) from that portion. And a fused surface 22 is obtained at the tube end of the coated polyethylene tube 12 (see FIG. 2B).

  Then, a scraping (cutting) operation of the fusion surface 22 is performed using a dedicated tool. Although the scraping operation is considered not to cause ultraviolet deterioration on the surface of the coated polyethylene tube 12, it is necessary to make the fusion performance more reliable. Further, the fusing surface 22 is cleaned, and thereafter, as shown in FIG. 6A, the main body cover 36 and the end cover 38 can be moved in the axial direction on the outer surface of the one coated polyethylene pipe 12. At the same time, the end cover 38 is disposed on the outer surface of the other coated polyethylene pipe 12 so as to be movable in the axial direction. Specifically, the coated polyethylene pipe 12 is inserted through the opening inside the main body cover 36 or the end cover 38.

  However, the covering layer 20 at the tube end of the coated polyethylene tube 12 may be removed after each portion of the cover 16 is disposed on the outer surface of the coated polyethylene tube 12.

  Next, the tube ends (fused surfaces 22) of the respective coated polyethylene tubes 12 are inserted into the receiving ports 26 of the electric fusion joint 14 respectively. Subsequently, the power cable of the controller (not shown) is connected to the power source, and the power source is switched on to start up, and the connection terminal of the output cable extending from the controller is connected to the terminal portion 32 of the electrofusion joint 14.

  Since heat is generated when an electric current is passed through the heating wire 28, the inner surface of the receiving port 26 and the fused surface 22 of the coated polyethylene tube 12 are melted by this heat to perform electrofusion bonding. At this time, the indicator 34 of the joint body 24 bulges on both the left and right sides by correctly fusing the inner surface of the receiving port 26 and the fusing surface 22 of the coated polyethylene pipe 12.

  When the fusion surface is cooled and solidified after energization, the terminal portion 32 (or indicator 34) of the electrofusion joint 14 is removed with a cutter or the like, as shown in FIG. 6B.

  Subsequently, the cover 16 is attached to the connection portion between the coated polyethylene pipe 12 and the electrofusion joint 14.

  Specifically, first, the main body cover 36 arranged on the outer surface of the coated polyethylene pipe 12 is moved to the position of the joint main body 24 of the electrofusion joint 14 (toward the direction), and the main body cover 36 is moved. The outer surface of the electrofusion joint 14 is covered by the first covering portion 40.

  Then, the end cover 38 is combined with each of both ends of the main body cover 36 moved to the position of the electric fusion joint 14. That is, both end portions of the first covering portion 40 of the main body cover 36 are respectively inserted into the short cylindrical portions 46 of the reduced diameter portions 42 of the end cover 38, and the main body cover 36 and each end cover 38 are joined, An end cover 38 covers a gap formed between the main body cover 36 and the coating layer 20 remaining on the coated polyethylene tube 12.

  Finally, the small-diameter portion 44 of each end cover 38 is fixed on the outer surface of the coating layer 20 of the coated polyethylene tube 12 by a fastening tool 52 such as a wire or a fastening band. By doing so, the cover 16 is fixed in a state where the range from the coating layer 20 of one coated polyethylene pipe 12 to the coating layer 20 of the other coated polyethylene pipe 12 is covered, and the operation is completed.

  As described above, in this embodiment, after the coated polyethylene pipes 12 are fused and joined together by the electric fusion joint 14, the outer surface of the electrical fusion joint 14 is covered by the main body cover 36 (first covering portion 40). At the same time, an end cover 38 (reduced diameter portion 42, small diameter portion 44) is attached to the end of the main body cover 36, and the range from the main body cover 36 to the coating layer 20 remaining on the coated polyethylene tube 12 by the end cover 38. Is covered.

  In this way, not only the outer surface of the electric fusion joint 14 but also the step 50 generated between the outer surface of the electric fusion joint 14 and the outer surface of the coated polyethylene pipe 12, the fusion surface 22 of the coated polyethylene pipe 12, and the like are external. Therefore, weather resistance can be imparted to the entire coated conduit 10.

  According to this embodiment, the cover 16 is configured by combining cylindrical portions (the first covering portion 40, the reduced diameter portion 42, and the small diameter portion 44) that are molded as a single piece in the circumferential direction. Therefore, the cover 16 is very strong against an external impact, and problems such as the cover 16 falling off can be avoided. Therefore, it is possible to suppress the possibility of deterioration of weather resistance due to the falling off of the cover 16 and the like, and it can be suitably used even in an environment where the cladding pipe line 10 is exposed to the outside.

  Further, the main body cover 36 is disposed at the position of the electric fusion joint 14, and end cover 38 is attached to both ends of the main body cover 36, and the end cover 38 is placed on the outer surface of the coating layer 20 of the coated polyethylene pipe 12. Since the weather resistance can be imparted to the entire coated pipe line 10 by a simple operation that is simply fixed by the fastening tool 52, the flange portion of each cover portion is used as a pipe member at the construction site as in Patent Document 1. There is no need to perform energization (fusion) work for fusing. Therefore, it is excellent in workability.

  Further, in this embodiment, the body cover 36 and the end cover have a simple fitting structure in which the end portion of the first covering portion 40 of the main body cover 36 is inserted into the receiving port of the reduced diameter portion 42 of the end cover 38. 38 are combined, the main body cover 36 and the end cover 38 can be formed in a simple shape, and the manufacturing cost of the cover 16 can be reduced accordingly.

  Furthermore, in this embodiment, the main body cover 36 and the end cover 38 (the reduced diameter portion 42) are configured to be separable from each other. Therefore, as in the construction method described above, one coated polyethylene pipe 12 is inserted into the body cover 36 and the end cover 38 and the end cover 38 is inserted into the other coated polyethylene pipe 12. In this case, the cover 16 covering the range from the coating layer 20 of one coated polyethylene pipe 12 to the coating layer 20 of the other coated polyethylene pipe 12 can be easily obtained after the coated polyethylene pipes 12 are joined together by the electric fusion joint 14. Can be configured. That is, the cover 16 can be easily attached.

  In the above-described embodiment, the cover 16 is configured by combining one main body cover 36 (first covering portion 40) and two end covers 38 (the reduced diameter portion 42 and the small diameter portion 44). It is not necessary to be limited to this.

  7, unlike the embodiment shown in FIG. 1, a cover 16 is formed by combining one body cover 54 and one end cover 56, unlike the embodiment shown in FIG. 1. Composed. Hereinafter, the same reference numerals are used for the same parts as in the previous embodiment, and the description thereof is omitted or simplified.

  As shown in FIGS. 8 and 9, the cover 16 is made of a synthetic resin such as low-density polyethylene, and is formed by combining a main body cover 54 and one end cover 56 that are separable from each other.

  The main body cover 54 includes a cylindrical (sleeve-shaped) first covering portion 40, a reduced diameter portion 42, and a small diameter portion 44, and is formed as an integral body by injection molding or the like. The first covering portion 40 has a cylindrical shape with an inner diameter larger than the outer shape of the electrofusion joint 14, and a reduced diameter portion 42 is integrally formed at one end in the axial direction thereof. The reduced diameter portion 42 includes a donut plate portion 48 that covers the open end of the receiving port 16 of the electrofusion joint 14, and is between the outer surface of the coated polyethylene pipe 12 and the outer surface of the joint body 24 of the electrofusion joint 14. It has a cylindrical shape corresponding to the step 50 produced. The donut plate portion 48 is formed in a donut plate shape having an opening in the central portion, and a small diameter portion 44 is integrally formed on the inner peripheral edge thereof. The small diameter portion 44 is formed in a short cylindrical shape having an inner diameter larger than the outer diameter of the coating layer 20 of the coated polyethylene pipe 12 and smaller than the inner diameter of the first coating portion 40, and the inner peripheral edge of the donut plate portion 48 of the reduced diameter portion 42. Extends outward in the axial direction, that is, on the side opposite to the reduced diameter portion 42.

  The end cover 56 includes a cylindrical (sleeve-shaped) reduced diameter portion 42 and a small diameter portion 44, and is formed as an integral body by injection molding or the like. The reduced diameter portion 42 includes a short cylindrical portion 46 and a nut plate portion 48 and has a cylindrical shape corresponding to a step 50 generated between the outer surface of the coated polyethylene pipe 12 and the outer surface of the joint body 24 of the electrofusion joint 14. doing. The short cylindrical portion 46 of the reduced diameter portion 42 is formed in a short cylindrical shape having a slightly larger diameter than the first covering portion 40 of the main body cover 36, and the end portion of the first covering portion 40 is inside the short cylindrical portion 46. Accepted. The donut plate portion 48 is formed at the axially outer end of the short cylindrical portion 46 and has a donut plate shape having an opening at the center. The small-diameter portion 44 is formed in a short cylindrical shape having an inner diameter larger than the outer diameter of the coating layer 20 of the coated polyethylene pipe 12 and smaller than the inner diameter of the first coating portion 40, and extends outward in the axial direction from the inner periphery of the donut plate portion 48. That is, it extends to the opposite side to the reduced diameter portion 42.

  With reference to FIG. 7 and FIG. 10, the method of constructing such a coated conduit 10 will be described below.

  First, two coated polyethylene pipes 12 are prepared. Then, the coating layer 20 at the end of the pipe used for joining the respective coated polyethylene pipes 12 is removed, the fused surface 22 is obtained at the pipe end of each coated polyethylene pipe 12, and the fused surface 22 is scraped. At the same time, as shown in FIG. 10A, a main body cover 54 is disposed on the outer surface of one coated polyethylene tube 12 so as to be movable in the axial direction, and an end cover 56 is disposed on the outer surface of the other coated polyethylene tube 12. Is arranged to be movable in the axial direction.

  Next, the pipe end portions (fused surfaces 22) of the respective coated polyethylene pipes 12 are respectively inserted into the receiving ports 26 of the electric fusion joint 14, and the inner surfaces of the receiving ports 26 and the fused surfaces 22 of the coated polyethylene tubes 12 are connected. Melt and perform electrical fusion bonding.

  When the fused surface is cooled and solidified after energization, as shown in FIG. 10B, the terminal portions 32 and the like of the electrofused joint 14 are removed with a cutter or the like, and then the coated polyethylene pipe 12 and the electrofused joint 14 are removed. A cover 16 is attached to the connecting portion.

  Specifically, the main body cover 54 arranged on the outer surface of the coated polyethylene pipe 12 is moved to the position of the electrofusion joint 14, and the end cover 56 is attached to the end of the main body cover 54 in the same manner as described above. Are combined to form the cover 16.

  Finally, the small diameter portion 44 of the main body cover 54 is fixed on the outer surface of the coating layer 20 of the coated polyethylene tube 12 by the fastening tool 52, and the small diameter portion 44 of the end cover 56 is covered by the fastening tool 52. By fixing on the outer surface of the layer 20, the cover 16 is fixed in a state where the range from the coating layer 20 of one coated polyethylene pipe 12 to the coating layer 20 of the other coated polyethylene pipe 12 is covered, and the operation is completed. .

  Also in this embodiment, similarly to the embodiment of FIG. 1, the cover 16 is formed by combining cylindrical portions (a first covering portion 40, a reduced diameter portion 42, and a small diameter portion 44) that are molded as a single piece in the circumferential direction. Therefore, the cover 16 is very strong against an impact from the outside, and problems such as dropping of the cover 16 can be avoided. Therefore, it can be suitably used even in an environment where the cladding pipe line 10 is exposed to the outside.

  Further, the main body cover 36 is disposed at the position of the electric fusion joint 14, and one end cover 38 is attached to the end of the main body cover 36, so that the main body cover 36 and the end cover 38 are placed on the outer surface of the coating layer 20. Since the weather resistance can be imparted to the entire coated pipe line 10 by a simple operation that is simply fixed by the fastening tool 52, the workability is excellent.

  Furthermore, in the above-described embodiment, the cover 16 is configured by combining the main body covers 36 and 54 and the end covers 38 and 56, but it is not necessary to be limited to this.

  For example, in the coated pipe line 10 which is still another embodiment of the present invention shown in FIG. 11, unlike the embodiment shown in FIG. 1 and FIG. Hereinafter, the same reference numerals are used for the same parts as in the previous embodiment, and the description thereof is omitted or simplified.

  As shown in FIG. 11, the cover 16 (main body cover 58) includes a cylindrical (sleeve-shaped) first covering portion 40, a reduced diameter portion 42, and a small diameter portion 44, and is molded as an integral body by injection molding or the like. The A reduced diameter portion 42 is integrally formed at one end of the first covering portion 40 in the axial direction. The reduced diameter portion 42 includes a donut plate portion 48 that covers the open end of the receiving port 16 of the electrofusion joint 14, and a small diameter portion 44 is integrally formed on the inner peripheral edge of the donut plate portion 48. The small diameter portion 44 extends from the donut plate portion 48 to the outside in the axial direction, that is, the side opposite to the first covering portion 40.

  Moreover, the other end of the 1st coating | coated part 40 is extended in the axial direction outer side, and has the extension part 60 there. The extending portion 60 covers a gap formed between the main body cover 58 and the coating layer 20 remaining on the coated polyethylene pipe 12 from above, and the outer surface of the electrofusion joint 14 and the coated polyethylene pipe are covered from this gap. 12 has a predetermined axial length so as to prevent irradiation of ultraviolet rays or the like to the step 50 generated between the outer surface 12 and the fused surface 22 of the coated polyethylene tube 12. The predetermined axial length of the extending portion 60 is appropriately set according to the environment in which the cladding pipe line 10 is used.

  With reference to FIG. 11, a method for constructing such a coated conduit 10 will be described below.

  First, two coated polyethylene pipes 12 are prepared. Then, the coating layer 20 at the end of the pipe used for joining the respective coated polyethylene pipes 12 is removed, the fused surface 22 is obtained at the pipe end of each coated polyethylene pipe 12, and the fused surface 22 is scraped. At the same time, the cover 16 (main body cover 58) is arranged on the outer surface of one of the coated polyethylene pipes 12 so as to be movable in the axial direction.

  Next, the pipe end portions (fused surfaces 22) of the respective coated polyethylene pipes 12 are respectively inserted into the receiving ports 26 of the electric fusion joint 14, and the inner surfaces of the receiving ports 26 and the fused surfaces 22 of the coated polyethylene tubes 12 When the fused surface is cooled and solidified after being energized, the terminal portion 32 of the electrofused joint 14 is removed with a cutter or the like, and then the coated polyethylene tube 12 and the electrofused joint are melted. The cover 16 is attached to the connecting portion with the 14.

  Specifically, the main body cover 58 is moved to the position of the electrofusion joint 14, and the reduced diameter portion 42 of the main body cover 58 is generated between the outer surface of the electrofusion joint 14 and the outer surface of the coated polyethylene pipe 12. To be close to

  Then, the small diameter portion 44 of the main body cover 58 is fixed on the outer surface of the coating layer 20 of the coated polyethylene tube 12 by the fastening tool 52, so that the coating layer 20 of the one coated polyethylene tube 12 covers the other coated polyethylene tube 12. The cover 16 is fixed in a state where the range up to the layer 20 is covered, and the operation is finished.

  In this embodiment, since the cover 16 is formed only by the cylindrical (sleeve-shaped) main body cover 58 formed as a single piece in the circumferential direction, the cover 16 is very strong against impact from the outside. It is possible to avoid problems such as 16 dropping off. Therefore, it can be suitably used even in an environment where the cladding pipe line 10 is exposed to the outside.

  Furthermore, the main body cover 36 is disposed at the position of the electric fusion joint 14 and the main body cover 36 is fixed to the outer surface of the covering layer 20 by the fastening tool 52, and the entire covering pipe line 10 is weather resistant. Therefore, it is excellent in workability.

  Furthermore, in the above-described embodiment, it has a simple fitting structure in which the end portion of the first covering portion 40 of the main body covers 36 and 54 is inserted into the receiving port of the reduced diameter portion 42 of the end covers 38 and 56. The main body covers 36 and 54 and the end covers 38 and 56 are combined, and the small-diameter portion 44 is fixed on the outer surface of the coating layer 20 of the coated polyethylene pipe 12 by the fastening tool 52, but is not limited thereto. There is no need. A fixing means for fixedly combining the main body cover 36 and the end cover 38 is provided, and the cover 16 is placed in that position (that is, from the coating layer 20 of one coated polyethylene tube 12 to the coating layer 20 of the other coated polyethylene tube 12). You may make it fix in the state which coat | covered the range to. Hereinafter, an embodiment in which fixing means is provided on the cover 16 used in the embodiment of FIG. 1 will be described. However, fixing means may be provided on the cover 16 used in other embodiments.

  As an example of the fixing means, as shown in FIG. 12 (a), the first screw portion 62 is formed on the outer surface of the axial end portion of the first covering portion 40, and the inner surface of the short cylindrical portion 46 of the reduced diameter portion 42. The second screw part 64 is formed in the first screw part 64 and the first screw part 62 of the first covering part 40 and the second screw part 64 of the reduced diameter part 42 are screwed together as shown in FIG. The main body cover 36 and the end cover 38 may be fixedly combined.

  Further, as another example of the fixing means, as shown in FIG. 13A, the first fitting portion 66 having a hollow shape on the outer surface of the end portion in the axial direction of the first covering portion 40 over the entire circumference in the circumferential direction. And a projecting second fitting portion 68 is formed on the inner surface of the short cylindrical portion 46 of the reduced diameter portion 42 over the entire circumference in the circumferential direction. As shown in FIG. The main body cover 36 and the end cover 38 may be fixedly combined by fitting the first fitting portion 66 of the covering portion 40 and the second fitting portion 68 of the reduced diameter portion 42. However, the first fitting portion 66 and the second fitting portion 68 do not necessarily need to be formed over the entire circumference, and may be formed only in a part of the circumferential direction. While forming the protrusion-like 1st fitting part in the outer surface of the part 40, you may make it form a hollow 2nd fitting part in the inner surface of the diameter-reduced part 42. FIG.

  According to the embodiment of FIGS. 12 and 13, the end cover 38 is not detached from the main body cover 36 by the fixing means, so that the weather resistance can be surely imparted by the coated conduit 10. Further, since the movement (displacement) of the main body cover 36 from the position of the electric fusion joint 14 can be restricted by the reduced diameter portion 42 of the end cover 38, the main body cover 36 is placed on the outer surface of the coating layer 20. It is also possible to omit the work of fixing with the fastening tool 52.

  Further, unlike the embodiment shown in FIG. 1 and FIG. 7, the coated conduit 10, which is still another embodiment of the present invention shown in FIG. 14, combines one main body cover 70 and two closing members 72. Thus, the cover 16 is configured. Hereinafter, the same reference numerals are used for the same parts as in the previous embodiment, and the description thereof is omitted or simplified.

  As shown in FIG. 14, the cover 16 is made of a synthetic resin such as low-density polyethylene, and is formed by combining a main body cover 70 and two closing members 72 that are separable from each other.

  As shown in FIGS. 14 and 15, the main body cover 70 includes a cylindrical (sleeve-shaped) second covering portion 74, and is molded as an integral body by injection molding or the like. The second covering portion 74 has a cylindrical shape with an inner diameter larger than the outer shape of the electric fusion joint 14. When the cover 16 is attached, the second covering portion 74 is disposed on the outer surface of the electric fusion joint 14 and is covered with one of the coated polyethylene. A coating layer covering the range from the coating layer 20 of the tube 12 to the coating layer 20 of the other coated polyethylene tube 12 is formed. That is, the 2nd coating | coated part 74 has predetermined | prescribed axial direction length so that the range from the coating layer 20 of one coating polyethylene pipe | tube 12 to the coating layer 20 of the other coating polyethylene pipe | tube 12 can be coat | covered. The length is, for example, 200 mm.

  A ring groove 76 for fitting the above-described closing member 72 is formed on the inner surface side of both end portions of the second covering portion 74. The ring groove 76 is formed by recessing the inner surface side of the second covering portion 74 in an annular shape over the entire length in the circumferential direction, and has a shape along the outer shape of the closing member 72.

  Further, as shown in FIG. 16, the closing member 72 includes a C-ring (main body) 78 having a circular cross section made of a synthetic resin such as low density polyethylene, and the main body 78 is a ring groove 76 of the second covering portion 74. Fits inside. Due to its shape characteristics, the main body 78 of the closing member 72 is reduced in diameter when an external force is applied from the outside to the inside in the radial direction, and when the diameter is reduced (fitted in the circumferential end of the closing member 72). When the two are brought into contact with each other), the inner diameter is made substantially equal to the outer diameter of the coating layer 20 of the coated polyethylene tube 12, and the inner surface of the second coating portion 74 and the coating layer 20 of the coated polyethylene tube 12 are The gap between them is closed, and the position of the main body cover 70 (second covering portion 74) is held by the frictional force (that is, the cover 16 is fixed to the covering layer 20 of the covering polyethylene tube 12). The diameter of the main body 78 is set so that the inner diameter is slightly larger than the outer diameter of the coating layer 20 of the coated polyethylene pipe 12 when the diameter is expanded (normal time when the diameter is not reduced).

  With reference to FIG. 14 and FIG. 16, the method of constructing such a coated conduit 10 will be described below.

  First, two coated polyethylene pipes 12 are prepared. Then, the coating layer 20 at the end of the pipe used for joining the respective coated polyethylene pipes 12 is removed, the fused surface 22 is obtained at the pipe end of each coated polyethylene pipe 12, and the fused surface 22 is scraped. In addition, as shown in FIG. 17 (a), the main body cover 70 and one closing member 72 are arranged on the outer surface of one coated polyethylene tube 12 so as to be movable in the axial direction, and the outer surface of the other coated polyethylene tube 12 One closing member 72 is arranged on the upper side so as to be movable in the axial direction.

  Next, the pipe end portions (fused surfaces 22) of the respective coated polyethylene pipes 12 are respectively inserted into the receiving ports 26 of the electric fusion joint 14, and the inner surfaces of the receiving ports 26 and the fused surfaces 22 of the coated polyethylene tubes 12 are connected. Melt and perform electrical fusion bonding. When the fused surface is cooled and solidified after energization, as shown in FIG. 17B, the terminal portion 32 and the like of the electrofused joint 14 are removed with a cutter or the like, and then the coated polyethylene tube 12 and the electrofused joint 14 are removed. A cover 16 is attached to the connecting portion. Specifically, the main body cover 70 arranged on the outer surface of the coated polyethylene pipe 12 is moved to the position of the electrofusion joint 14, and the diameter of the main body 78 of the closing member 72 is reduced to reduce the ring groove of the main body cover 70. 76, the gap between the inner surface of the second covering portion 74 of the main body cover 70 and the covering layer 20 of the covering polyethylene pipe 12 is closed, so that the covering layer 20 of one covering polyethylene pipe 12 is covered with the other covering. The cover 16 is fixed in a state where the range up to the coating layer 20 of the polyethylene pipe 12 is covered, and the operation is finished.

  Thus, in this embodiment, after the coated polyethylene pipes 12 are fused and joined together by the electric fusion joint 14, from the coating layer 20 of one coated polyethylene pipe 12 to the coating layer 20 of the other coated polyethylene pipe 12. Is covered with the main body cover 70 (second covering portion 74), and the closing member 72 is fitted into the ring groove 76 of the main body cover 70, so that the inner surface of the main body cover 70 and the covering layer 20 of the covering polyethylene pipe 12 I try to close the gap between them.

  In this way, not only the outer surface of the electric fusion joint 14 but also the step 50 generated between the outer surface of the electric fusion joint 14 and the outer surface of the coated polyethylene pipe 12, the fusion surface 22 of the coated polyethylene pipe 12, and the like are external. Therefore, weather resistance can be imparted to the entire coated conduit 10.

  Further, in this embodiment as well, the cover 16 is constituted by a cylindrical (sleeve-like) main body cover 58 formed as a single piece in the circumferential direction and a closing member 72 fitted therein, so that the cover 16 Is very strong against external impacts, and it is possible to avoid problems such as falling off of the cover 16. Therefore, it can be suitably used even in an environment where the cladding pipe line 10 is exposed to the outside.

  Furthermore, weather resistance is imparted to the entire coated pipe line 10 by a simple operation of simply placing the main body cover 36 at the position of the electric fusion joint 14 and fitting the closing member 72 into the main body cover 70. It can be used, so it is excellent in workability

  In this embodiment, the main body 78 of the closing member 72 is formed in a C-ring shape having a circular cross section. However, the main body 78 is not limited to this, and may be formed in an O-ring shape or a donut plate shape. You may make it form in. The shape of the main body 78 of the closing member 72 can be changed as appropriate without departing from the scope of the present invention.

  As an example, as shown in FIG. 18A, the main body 78 of the closing member 72 is formed in a short cylindrical shape having an inner diameter equal to or substantially equal to the outer diameter of the coating layer 20 of the coated polyethylene pipe 12. A fitting portion 80 that fits into the ring groove 76 of the main body cover 70 may be formed on the outer surface of the main body cover 70. In this case, as shown in FIG. 18B, when the cover 16 is attached to the connecting portion between the coated polyethylene pipe 12 and the electrofusion joint 14, the main body is disposed on the outer surface of the coated polyethylene pipe 12. The cover 70 is moved to the position of the electric fusion joint 14, the main body 78 of the closing member 72 is inserted into the main body cover 70, and the fitting portion 80 is fitted into the ring groove 76. 2 The gap between the inner surface of the covering portion 74 and the covering layer 20 of the covering polyethylene tube 12 is closed.

  Further, in each of the above-described embodiments, the coated pipe line 10 is formed by covering the connection portion in which the coated polyethylene pipes 12 that are straight pipes are connected by the electric fusion joint 14 with the cover 16. There is no need to be limited, and the coated polyethylene pipe 12 may be a curved pipe.

  Further, it is not always necessary to connect the coated polyethylene pipes 12 by the electric fusion joint 14. If the coated tube members in which the outer peripheral surface of the tube member made of polyolefin-based synthetic resin is coated with the coating layer are connected by the electrofused joint 14, a member other than the coated polyethylene tube 12 is used as the coated tube member. May be.

  That is, not only the coated polyethylene pipes 12 are connected to each other by the electric fusion joint 14, but the coated polyethylene pipe 12 and other coated pipe members may be connected to each other by the electric fusion joint 14. The coated pipe members other than the coated polyethylene pipe 12 may be connected by the fitting joint 14.

  An example of a coated tube member other than the coated polyethylene tube 12 is not shown, but the short tube portion of the short short tube, one of which is a short tube provided with a coating layer 20 and the other is a flange, is used as a coated tube member. You may make it utilize, You may make it utilize the straight pipe part (insertion part) of other types of couplings, such as a bend type, a reducer type, a cheese type, or an elbow type, as a cladding tube member. .

  Furthermore, in each of the above-described embodiments, the coated polyethylene pipes 12 are fused and joined together by the electric fusion joint 14, and then the terminal portions 32 and the like of the electric fusion joint 14 are removed with a cutter or the like. Although the main body covers 36, 54, 58 and 62 arranged on the outer surface of the polyethylene pipe 12 are moved to the position of the electrofusion joint 14, it is not necessary to be limited to this.

  For example, a terminal accommodating portion 82 that accommodates the terminal portion 32 of the electrofusion joint 14 is formed in the cover 16 as in a covered pipe line 10 that is still another embodiment of the present invention shown in FIG. The terminal part 32 of the electrofusion joint 14 may be inserted into the terminal accommodating part 82 when the cover 16 is attached, and the terminal part 32 may be accommodated in the terminal accommodating part 82 as it is. Hereinafter, an embodiment in which the terminal accommodating portion 82 is formed on the cover 16 used in the embodiment of FIG. 1 will be described. However, the terminal accommodating portion 82 may be formed on the cover 16 used in other embodiments. Good.

  As shown in FIGS. 19 and 20, the cover 16 is formed by combining a body cover 36 and two end covers 38 that are separable from each other. A terminal accommodating portion 82 is formed in a portion of the main body cover 36 in the circumferential direction of the first covering portion 40. The terminal accommodating portion 82 is formed by recessing the inner surface side of the first covering portion 40 into a shape that can accommodate the terminal portion 32 of the electrofusion joint 14, and extends over the entire axial length of the first covering portion 40. It is formed.

  In addition, the short cylindrical portion 46 of the reduced diameter portion 42 of each end cover 38 has a shape that can receive the end portion of the terminal accommodating portion 82 in accordance with the shape of the terminal accommodating portion 82 of the first covering portion 40. A portion 84 is formed. When the end portion of the first covering portion 40 of the main body cover 36 is inserted into the short cylindrical portion 46 of the end portion cover 38 in order to combine the main body cover 36 and the end portion cover 38, the terminal receiving portion 84 is inserted into the receiving portion 84. 82 ends are received.

  According to the embodiment shown in FIG. 19, when the main body cover 36 is moved to the position of the electric fusion joint 14 after the coated polyethylene pipes 12 are fusion-bonded by the electric fusion joint 14, the inside of the terminal accommodating portion 82. The terminal portion 32 of the electrofusion joint 14 can be inserted into the terminal accommodating portion 82 and the terminal portion 32 can be accommodated as it is. Therefore, since it is not necessary to remove the terminal part 32, the indicator 34, etc. of the electric fusion joint 14, the further improvement of workability | operativity is realizable.

  In any of the above explanations, the covering pipe line 10 is configured by covering the connecting portion between the covering polyethylene pipe 12 and the electric fusion joint 14 with the cover 16. It goes without saying that a plurality of joint structures may be included.

  In any of the above explanations, the cover 16 covers the connection part of the cladding pipe line 10 in which the coated polyethylene pipes (cladding pipe members) 12 are connected to each other by the electric fusion joint 14, Although used to prevent UV degradation, it need not be limited to this. This cover 16 is used as it is for applications such as preventing freezing of pipe connections in cold regions, for preventing condensation on water supply pipe connections in buildings, and for heat insulation and insulation of hot water pipe connections. You may make it do.

  That is, the cover 16 shown in the embodiment of FIGS. 1, 7, 12, 13, 14, and 18 is used for a connection portion (joint portion) of a pipe in which two pipe members are connected by a pipe joint. By covering the range from the tube member to the other tube member with the cover 16, freezing and condensation of the connecting portion may be prevented, or heat insulation and insulation of the connecting portion may be performed.

  For example, if the pipe member here is a water supply pipe, it is a cross-linked polyethylene pipe, a polybutene pipe, a vinyl chloride lining steel pipe in which the inner surface of the steel pipe is lined with vinyl chloride, or the like, but it need not be limited to this.

  Even in this case, it is possible to avoid problems such as falling off of the cover by forming the cover with the cylindrical portions formed as a single piece in the circumferential direction.

  Further, the body covers 36 and 54 of the cover 16 are arranged at the pipe joint positions, end covers 38 and 56 are attached to the ends of the body covers 36 and 54, and the end covers 38 and 56 are attached to the pipe members. A simple operation that is simply fixed on the outer surface by the fastening tool 52 or the like, or the main body cover 70 of the cover 16 is arranged at the position of the pipe joint, and the closing member 72 is simply fitted into the main body cover 70. The work can be prevented from freezing and dew condensation at the connection part of the pipe, and heat insulation and insulation of the connection part can be performed, so that workability is excellent.

  In addition, when the connection part of hot water supply piping is coat | covered with the cover 16, you may make it add a heat retention function by inserting | pinching a heat retention material between the cover 16 and a pipe joint, The cover 16 may be integrated with the cover 16.

  Further, the specific numerical values such as the diameter and the height described above are merely examples, and can be appropriately changed as necessary.

DESCRIPTION OF SYMBOLS 10 ... Cladding pipe line 12 ... Coated polyethylene pipe 14 ... Electro-fusion joint 16 ... Cover 18 ... Inner pipe 20 ... Covering layer 24 ... Joint main body 32 ... Terminal part 36, 54, 58, 70 ... Main body cover 38, 56 ... End Part cover 40 ... first covering part 42 ... reduced diameter part 44 ... small diameter part 72 ... closing member 74 ... second covering part 76 ... ring groove 82 ... terminal accommodating part

Claims (11)

A coated pipe line in which the outer peripheral surface of the pipe member made of a synthetic resin is covered with a coating layer and the coating layer is removed from the pipe end parts used for joining of the coated pipe member, and the pipe end parts are connected by an electric fusion joint. There,
A cover that is fixed in a state of covering a range from the coating layer of one cladding tube member to the coating layer of the other cladding tube member;
The cover is
A first covering portion having a cylindrical shape with an inner diameter larger than the outer shape of the electrofusion joint, and covering a surface of the electrofusion joint;
One end is provided at the end of the first covering portion, and has a reduced diameter portion having a cylindrical shape corresponding to a step formed between the electrofusion joint and the cladding tube member, and other than the reduced diameter portion A cladding pipe line including a small-diameter portion integrally formed at an end and having a cylindrical shape having an inner diameter larger than an outer diameter of the cladding tube member and smaller than an inner diameter of the first coating portion.   The cover is disposed so as to be axially movable on the outer surface of the coating layer of the cladding tube member before the cladding tube members are connected by the electric fusion joint, and the cladding tube members are connected to each other. After being connected by the electric fusion joint, it is moved in the direction of the electric fusion joint and fixed in a state where the range from the coating layer of one cladding tube member to the coating layer of the other cladding tube member is covered. The coated conduit according to claim 1.   3. The cladding tube according to claim 1, wherein the reduced diameter portion is provided at each of both end portions of the first covering portion, and at least one of the reduced diameter portions is provided so as to be separable from the first covering portion. Road.   The said one end of the said diameter reduction part is a cladding pipe line of Claim 3 which has a receiving port shape which receives the edge part of the said 1st coating | coated part. A coated pipe line in which the outer peripheral surface of the pipe member made of a synthetic resin is covered with a coating layer and the coating layer is removed from the pipe end parts used for joining of the coated pipe member, and the pipe end parts are connected by an electric fusion joint. There,
A cover that is fixed in a state of covering a range from the coating layer of one cladding tube member to the coating layer of the other cladding tube member;
The cover is
A second covering portion having a cylindrical shape with an inner diameter larger than the outer shape of the electrofusion joint, wherein a ring groove is formed on the inner surface side of both ends, and the second covering portion is disposed inside the ring groove; The covering pipe line containing the obstruction | occlusion member which block | closes the space between the inner surface of each and the coating layer of each cladding tube member. The electric fusion joint includes a terminal portion that protrudes from the outer surface of the receptacle and energizes the heating wire,
6. The coating according to claim 1, wherein the cover includes a terminal accommodating portion that is formed over the entire axial length of the first covering portion or the second covering portion and accommodates the terminal portion. Pipeline. It is the construction method of the cladding pipe line in any one of Claims 1 thru | or 5, Comprising:
(A) removing the coating layer at the end of the tube used for joining the coated tube member;
(B) disposing a cover on the outer surface of the coating layer of the cladding tube member so as to be movable in the axial direction;
(C) After the step (b), the step of fusion-connecting the tube ends of the cladding tube member from which the coating layer has been removed in the step (a) by an electric fusion joint;
(D) After the step (c), the cover disposed on the outer surface of the covering layer of the covering tube member in the step (b) is moved in the direction of the electric fusion joint, and one covering tube is moved by the cover. And (e) after the step (d), a small diameter portion of the cover is formed on the outer surface of the covering layer of the covering tube member, and a step of covering the range from the covering layer of the member to the covering layer of the other covering tube member. A construction method including the step of fixing with a fastener. It is the construction method of the cladding pipe line of Claim 3 or 4,
(A) removing the coating layer at the end of the tube used for joining the coated tube member;
(B) On the outer surface of the coating layer of one cladding tube member, the first coating portion of the cover and the one reduced diameter portion and the small diameter portion are arranged so as to be movable in the axial direction, and the outer surface of the other cladding tube member A step of disposing the other reduced diameter portion and the small diameter portion of the cover so as to be movable in the axial direction;
(C) After the step (b), the step of fusion-connecting the tube ends of the cladding tube member from which the coating layer has been removed in the step (a) by an electric fusion joint;
(D) After the step (c), the step of moving the first covering portion disposed on the outer surface of one of the cladding tube members in the step (b) to the position of the electrofusion joint;
(E) combining the one reduced diameter portion and the small diameter portion and the other reduced diameter portion and the small diameter portion with the first covering portion from the covering layer of the one cladding tube member by the cover to the other covering portion. A step of covering a range of the tube member up to the covering layer; and (f) after the step (e), fixing each small-diameter portion of the cover on the outer surface of the covering layer of the covering tube member with a fastening tool. Including construction methods.   The cover pipe line according to any one of claims 1 to 6, wherein the cover is fixed in a state of covering a range from an outer layer of one cladding tube member to an outer layer of the other cladding tube member. In a pipe in which two pipe members are connected by a pipe joint, a cover fixed in a state of covering a range from one pipe member to the other pipe member,
A first covering portion having a cylindrical shape having an inner diameter larger than the outer shape of the pipe joint, and covering a surface of the pipe joint;
A diameter-reduced portion provided at both ends of the first covering portion and having a cylindrical shape corresponding to a step formed between the pipe joint and the tube member, and formed integrally with the diameter-reduced portion. A small diameter portion having a cylindrical shape having an inner diameter larger than the outer diameter of the tube member and smaller than the inner diameter of the first covering portion,
A cover in which at least one of the reduced diameter portions is provided so as to be separable from the first covering portion. In a pipe in which two pipe members are connected by a pipe joint, a cover fixed in a state of covering a range from one pipe member to the other pipe member,
A second covering portion having a cylindrical shape with an inner diameter larger than the outer shape of the pipe joint, and covering a surface of the pipe joint;
Ring grooves respectively formed on the inner surface side of both end portions of the second covering portion, and a block disposed inside the ring groove to block the space between the inner surface of the second covering portion and the outer surface of each pipe member A cover comprising a member.

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