Sheath pipe, sheath pipe joint structure, sheath pipe joint structure manufacturing method, and sheath pipe insertion portion forming tool

Abstract

To provide a sheath pipe which allows easy and efficient manufacturing of a sheath pipe joining structure in which a plurality of the sheath pipes are joined to one another in a pipe axial direction, the sheath pipe joining structure, a sheath pipe joining structure manufacturing method, and a sheath pipe insertion part forming tool.SOLUTION: A sheath pipe 100 has: a resin piping member 110 formed of a synthetic resin; an insertion part 130 arranged at one edge F in a pipe axis O1 direction of the resin piping member 110; and a receptacle socket 120 arranged at the other side R in the pipe axis O1 direction of the resin piping member 110, and having a lock claw part 125 for locking the insertion part 130 so as to be insertable with the insertion part 130. The insertion part 130 is arranged in a position which is set from an end face 115 of the resin piping member at one side F, formed at an external peripheral face of the resin piping member 110 in a peripheral direction, and constituted of a lock groove part 135 to which the lock claw part 125 can be locked.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a sheath tube, a sheath tube joint structure, a method for manufacturing the sheath tube joint structure, and a sheath tube insertion portion forming tool. [Background technology]

[0002] As is well known, for example, a plurality of sheath pipe assemblies (or sheath pipes) made of synthetic resin are laid inside a buried pipe buried in the ground, and a communication cable or the like is inserted into each sheath pipe assemblies. Then, each sheath pipe assemblies allows the communication cable or the like to be led to a required location. Such a sheath tube joint is constructed by coaxially joining the ends of a plurality of sheath tubes together.

[0003] As one embodiment of such a sheath pipe, for example, a fixed-length (eg, 5 m) adhesiveless sheath pipe is used. A fixed-length adhesiveless sheath pipe has an insertion socket (male socket) arranged on one side of a plastic piping component and a receiving socket (female socket) arranged on the other side, and these sockets are connected to the plastic piping component by heat fusion with a spin weld (see, for example, Patent Document 1).

[0004] Such an insertion socket has a first engagement piece that protrudes outward from the tip, and the receiving socket (receiving portion) has a second engagement piece that protrudes inward at a position corresponding to the first engagement piece. When the plug-in socket is inserted, the second engagement piece elastically deforms and displaces outward, and when the first engagement piece reaches a predetermined position, the elastic force causes it to return to its original inward position, causing the first engagement portion and the second engagement portion to engage, joining the plug-in socket and the receiving socket, and ultimately joining the sheath tubes that are adjacent in the tube axial direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-247415 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when constructing a sheath tube joint using a conventional sheath tube, it is necessary to use, for example, a fixed-length (eg, 5 m) adhesiveless sheath tube and an adjustable sheath tube (short tube) having a different length. To manufacture such an adjustable sheath, for example, it is necessary to cut a fixed-length adhesiveless sheath and glue it with an adhesive sheath socket to produce an adjustable pipe. Therefore, there is a problem that the construction is time-consuming and the cost increases.

[0007] In addition, when using an adhesive sheath socket to join pipes, the worker must hold the ends of the sheath pipes together with his or her hands until the adhesive solidifies and the bonding effect is achieved. As a result, the construction labor hours increase and it is difficult to apply this method to construction that must be completed in a short time. Furthermore, by using an adhesive sheath socket for joining, there is a portion of the sheath socket that cannot be recycled.

[0008] The present invention has been made in consideration of the above circumstances, and aims to provide a sheath tube, a sheath tube joining structure, a method for manufacturing a sheath tube joining structure, and a sheath tube insertion portion forming tool that can easily and efficiently manufacture a sheath tube joining structure in which multiple sheath tubes are joined in the pipe axial direction, and ultimately enable the easy and efficient manufacture of adjustment piping. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention proposes the following means. (1) A first aspect of the present invention is a sheath tube having a piping member made of synthetic resin, an insertion portion arranged on one side of the piping member in the pipe axis direction, and a receiving portion arranged on the other side of the piping member in the pipe axis direction, into which the insertion portion can be inserted and having a locking claw portion for locking the insertion portion, wherein the insertion portion is arranged at a position set from an end face on the one side of the piping member, and is configured with a locking groove portion formed in the circumferential direction on the outer circumferential surface of the piping member and into which the locking claw portion can engage.

[0010] The sheath tube according to the present invention includes a piping member made of synthetic resin, an insertion portion disposed on one side of the piping member in the axial direction, and a receptacle portion disposed on the other side of the piping member in the axial direction, the receptacle portion having a locking claw portion into which the insertion portion can be inserted and which locks the insertion portion. The insertion portion is configured with a locking groove portion disposed at a set position from the end face on one side of the piping member and formed around the circumferential surface. When the insertion portion is inserted to a predetermined depth in the socket, the locking claw portion engages with the locking groove portion to lock the insertion portion so that it does not come out. Therefore, even if the insertion portion does not have a plug socket (a so-called male socket), the insertion portion of a sheath tube and the receptacle portion of another sheath tube can be efficiently joined together. Furthermore, when constructing the sheath pipe joint structure, the insertion portion can be formed easily and efficiently even on-site. As a result, it is possible to easily and efficiently manufacture a sheath tube joint structure in which a plurality of sheath tubes are joined in the tube axial direction. Furthermore, adjustable sheaths and tubes of desired lengths can be manufactured easily and efficiently.

[0011] Furthermore, since the plug-in portion is directly formed in the piping member, the plug-in portion can be formed in a desired position and installation can be completed in a short period of time. Furthermore, since there is no need to use a plug-in socket, the construction costs of the sheath pipe joint structure can be reduced. In addition, when manufacturing an adjustable sheath pipe that can be adjusted to a specified length, there is no need to use a joining part (adhesive sheath pipe socket), so there is no need to wait for the adhesive to harden, which reduces the number of manufacturing steps and shortens the construction time, making it applicable to construction projects with short construction times. In addition, when manufacturing an adjustment sheath pipe (short pipe), there is no need to use an adhesive sheath pipe socket, which reduces costs. Furthermore, by not using adhesive sheaths or sockets, all sheaths or sockets installed in the pipeline can be recycled.

[0012] Here, the receiving portion is not limited to a receiving member (receiving socket, female socket) and can be set arbitrarily, and for example, it may be formed by cutting a piping member of a sheath tube to form a locking claw portion.

[0013] (2) In the sheath tube described in (1) above, the receiving portion may be formed in a cylindrical wall portion made of synthetic resin, the locking claw portions which are capable of being displaced radially outward by elastic deformation are arranged at intervals around the circumferential direction of the cylindrical wall portion, and the piping member may be inserted and joined to the receiving portion.

[0014] In the sheath pipe of this invention, the receiving portion is formed in a cylindrical wall portion made of synthetic resin, and the locking claw portions, which are capable of being displaced radially outward by elastic deformation, are arranged at intervals circumferentially of the cylindrical wall portion, and are constituted by a receiving member (receiving socket) into which a piping member is inserted and joined.Therefore, it can be joined at a factory, and stable quality can be obtained without the need for the effort of forming the receiving portion at the construction site.

[0015] (3) A second aspect of the present invention is a sheath tube joining structure, characterized in that it is formed by joining a plurality of sheath tubes described in (1) or (2) above in the tube axial direction.

[0016] According to the sheath tube joining structure of the present invention, a plurality of sheath tubes (which may include an adjustable sheath tube) are prepared, the insertion port of a first sheath tube is inserted into the receiving port of a second sheath tube (another sheath tube) along the tube axis direction, and the locking claw portion is engaged with the locking groove portion, thereby joining the sheath tubes in the tube axis direction. As a result, there is no need to use a separately formed plug-in member (plug-in socket, male socket), which eliminates the cost of the plug-in member and allows the cost of the sheath tube joint structure to be reduced. In addition, since there is no need to use an adhesive sheath socket when manufacturing the adjustment sheath, construction time can be shortened.

[0017] (4) A third aspect of the present invention is a method for manufacturing a sheath pipe connection structure described in (3) above, comprising the steps of: preparing a sheath pipe material having a plain end portion on the one side where the cylindrical cross section of the piping member extends to an end face and a receiving portion on the other side; disposing a cutting tool at a position corresponding to the locking groove portion of the piping member; relatively rotating the sheath pipe material and the cutting tool around the pipe axis; and advancing the cutting tool from the outer peripheral surface of the piping member toward the pipe axis to cut the piping member and machine a groove in the piping member to form a sheath pipe having an insertion port on the one side; inserting the insertion port into the receiving port of another sheath pipe along the pipe axis direction, and joining the sheath pipe connection structure by engaging the locking claw portion with the locking groove portion.

[0018] According to the method for manufacturing a sheath pipe joint structure of the present invention, a sheath pipe material is prepared, one side of which is an unmachined plain end portion having the same cross section as the piping member extending to the end face, and the other side of which has a receiving portion disposed thereon. Next, a cutting tool is placed at a position corresponding to the engagement groove portion of the piping member that constitutes the sheath tube material, and the sheath tube material and the cutting tool are rotated relatively around the tube axis. The cutting tool is advanced from the outer peripheral surface of the piping member toward the tube axis to cut the outer peripheral surface of the piping member, forming an insertion port on one side of the sheath tube material, with a groove recessed inward in the thickness direction from the outer surface of the piping member around the entire circumferential direction of the piping member, to form a sheath tube. As a result, the spigot can be easily and efficiently formed on one side of the sheath tube blank.

[0019] (5) In the method for manufacturing a sheath tube joint structure described in (4) above, when adjusting the length in the axial direction of a sheath tube joint body consisting of a plurality of sheath tubes joined by the sheath tube joint structure, the plain end portion of the sheath tube material to be adjusted in length may be cut and removed to adjust it to a set length, and then a groove may be machined in the piping member.

[0020] According to the method for manufacturing a sheath tube connection structure of the present invention, when adjusting the length in the axial direction of a sheath tube connection body consisting of a plurality of sheath tubes joined by a sheath tube connection structure, the plain end portion of the sheath tube material to be adjusted in length is cut and removed to adjust it to a set length, and a groove is machined into the piping member of the sheath tube material whose length has been adjusted to form an insertion port. Therefore, when manufacturing an adjustable sheath with an adjusted length, there is no need to join the sheath with a joining member (an adhesive sheath socket). As a result, loss occurring when adjusting the length of the sheath tube can be suppressed. Furthermore, by not using adhesive sheaths or sockets, all sheaths or sockets installed in the pipeline can be recycled.

[0021] (6) A fourth aspect of the present invention is a sheath tube insertion portion forming tool for forming the insertion portion of the sheath tube described in (1) or (2) above, characterized in that it includes a piping guide portion that guides the piping member rotatably around the pipe axis, and a cutting tool that is capable of cutting an outer surface of the piping member rotated around the pipe axis.

[0022] The sheath pipe insertion portion forming tool of the present invention is equipped with a piping guide portion and a cutting blade capable of cutting the outer surface of a piping member. Therefore, by rotating the piping member around the pipe axis using the piping guide portion and bringing the cutting blade into contact with the outer peripheral surface of the rotating piping member, the locking groove portion can be easily and efficiently machined into one side of the piping member to form the locking groove portion.

[0023] (7) The sheath pipe insertion portion forming tool described in (6) above may be provided with a chamfering tool for forming at least one of an inner chamfered portion and an outer chamfered portion on the end of the piping member rotated around the pipe axis.

[0024] The sheath tube insertion portion forming tool of the present invention is equipped with a chamfering tool that forms at least one of an inner chamfered portion and an outer chamfered portion on the end of the piping member, so that when forming the locking groove portion, the inner chamfered portion and the outer chamfered portion can be efficiently formed on the end of the piping member. Effect of the Invention

[0025] According to the sheath tube, sheath tube joining structure, sheath tube joining structure manufacturing method, and sheath tube insertion portion forming tool of the present invention, a sheath tube joining structure in which multiple sheath tubes are joined in the tube axial direction can be easily and efficiently manufactured. [Brief description of the drawings]

[0026] [Figure 1] 1 is a cross-sectional view taken along a pipe axis direction, showing an example of a cable pipe protection structure in which a sheath pipe assembly according to a first embodiment of the present invention is laid in a buried pipe. [Diagram 2] FIG. 2 is a partial cross-sectional view illustrating an example of a schematic configuration of a sheath tube according to the first embodiment. [Diagram 3] FIG. 2 is a partial cross-sectional view illustrating an example of a schematic configuration of a sheath tube material according to the first embodiment. [Figure 4] FIG. 2 is a partial cross-sectional view showing a socket for explaining the schematic configuration of the sheath pipe joining structure according to the first embodiment. [Diagram 5]3 is an enlarged view of an insertion portion for explaining a schematic configuration of the sheath tube joining structure according to the first embodiment. FIG. [Figure 6] FIG. 3 is a partial cross-sectional view for explaining an outline of a state in which a sheath tube according to the first embodiment is joined. [Figure 7] FIG. 1 is a partial cross-sectional view illustrating a schematic configuration of a sheath tube joint (sheath tube joint structure) according to a first embodiment. [Figure 8] FIG. 2 is a cross-sectional view for explaining a schematic configuration of a sheath tube insertion portion forming tool according to the first embodiment. [Figure 9A] FIG. 2 is a conceptual diagram illustrating an outline of a sheath tube manufacturing method according to the first embodiment, in which a plain end portion of a sheath tube material is inserted into a sheath tube insertion portion forming tool. [Figure 9B] FIG. 2 is a conceptual diagram illustrating a state in which a chamfered portion is formed on a sheath tube, for explaining an outline of the sheath tube manufacturing method according to the first embodiment. [Figure 9C] 4 is a conceptual diagram illustrating a state in which a groove is machined in an insertion portion, for explaining an outline of a sheath tube manufacturing method according to the first embodiment. FIG. [Figure 9D] FIG. 2 is a conceptual diagram illustrating a state in which formation of an insertion portion has been completed, outlining the outline of the sheath tube manufacturing method according to the first embodiment. [Figure 10] FIG. 6 is a conceptual diagram illustrating a schematic configuration of a sheath tube insertion portion forming tool according to a second embodiment of the present invention. [Figure 11A] 13 is a conceptual diagram illustrating a schematic configuration of a sheath tube insertion portion forming tool according to a third embodiment of the present invention, viewed along a tube axis. FIG. [Figure 11B] FIG. 11 is a conceptual diagram showing a cross section seen from a side, illustrating a schematic configuration of a sheath tube insertion portion forming tool according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] First Embodiment A first embodiment of the present invention will be described below with reference to Figures 1 to 9D. The following embodiment is an example of a specific embodiment of the present invention, and is not intended to limit the technical scope of the present invention.

[0028] First, with reference to FIG. 1, an example of a cable pipe protection structure in which a sheath pipe assembly according to a first embodiment is laid inside a buried pipe will be described. FIG. 1 is a cross-sectional view taken along the pipe axis direction, showing an example of a cable pipe protection structure in which a sheath pipe assembly according to the first embodiment is laid in a buried pipe. In the figure, reference numeral 1 denotes a cable pipe protection structure, reference numeral 2 denotes a buried pipe, and reference numerals 3, 4, and 10 denote sheath pipe joints (sheath pipe joint structures).

[0029] As shown in FIG. 1, the cable pipe protection structure 1 according to the first embodiment includes, for example, a buried pipe 2 and a plurality (for example, 10) of sheath pipe joints (sheath pipe joint structures) 10 laid within the buried pipe 2. In this embodiment, the sheath tube connector 10 is, for example, a sheath tube connector 3 and a sheath tube connector 4 . The sheath tube joint (sheath tube joint structure) 3 (10) and the sheath tube joint (sheath tube joint structure) 4 (10) are configured to protect a communication cable, for example, an optical fiber cable (not shown), by inserting the communication cable therethrough. Here, the sheath tube joint (sheath tube joint structure) refers to an object formed by joining a plurality of sheath tubes (which may include an adjustable sheath tube) in the tube axial direction.

[0030] Also, for example, the sheath tube joint 3 (10) is a small-diameter sheath tube having an outer diameter of 34 mm, and is made of hard polyvinyl chloride resin. The sheath pipe joint 4 (10) is a large-diameter sheath pipe with an outer diameter of 54 mm, and is made of rigid polyvinyl chloride resin like the sheath pipe joint 3. Five each of the small-diameter sheath pipe joint 3 (10) and the large-diameter sheath pipe joint 4 (10) are laid in a buried pipe 10 with a nominal diameter of 200, for example.

[0031] In this case, the inner diameter of the small diameter sheath tube joint 3 (10) is set to 30 mm, and the inner diameter of the large diameter sheath tube joint 4 (10) is set to 50 mm. The buried pipe 2 is set, for example, to have an outer diameter of 216 mm and an inner diameter of 194 mm. In this case, the small diameter sheath pipe joint 3 (10) and the large diameter sheath pipe joint 4 (10) are each formed by extrusion molding of rigid polyvinyl chloride resin.

[0032] Next, with reference to Figs. 2 to 7, a schematic configuration of a sheath tube, a sheath tube blank, and a sheath tube joint (sheath tube joint structure) according to the first embodiment will be described. Fig. 2 is a partial cross-sectional view for explaining the schematic configuration of a sheath tube, Fig. 3 is a partial cross-sectional view for explaining the schematic configuration of a sheath tube material, Fig. 4 is a partial cross-sectional view for explaining the schematic configuration of a receiving socket (receiving member), Fig. 5 is an enlarged view showing an insertion portion, Fig. 6 is a partial cross-sectional view for explaining the schematic configuration of a sheath tube joining body, and Fig. 7 is a partial cross-sectional view for explaining the schematic configuration of a sheath tube joining body (sheath tube joining structure).

[0033] In the figure, reference numeral 10 denotes a sheath pipe joint (sheath pipe joint structure), reference numeral 100 denotes a sheath pipe, reference numeral 100P denotes a sheath pipe material, reference numeral 110 denotes a resin piping member (piping member), reference numeral 120 denotes a socket (receiving member, receiving portion), reference numeral 125 denotes a locking claw portion, reference numeral 130 denotes an insertion portion, and reference numeral 135 denotes a locking groove portion. Reference numeral O1 denotes the pipe axis (piping member) of the resin piping member, reference numeral F denotes one side in the direction of the pipe axis O1, and reference numeral R denotes the other side.

[0034] As shown in FIG. 2, the sheath pipe 100 includes, for example, a resin piping member (piping member) 110, a receiving socket (receiving member, receiving portion) 120, and an insertion portion . In addition, the sheath tube 100 is configured such that a receiving socket (receiving member, receiving portion) 120 is joined coaxially with the pipe axis O1 to the other side R of the resin piping member (piping member) 110, and an insertion portion 130 is formed on one side F. Furthermore, the socket socket (receptacle member, socket portion) 120 is joined to the resin piping member 110 by, for example, spin welding.

[0035] The resin piping member (piping member) 110 is formed, for example, in a cylindrical shape centered on a pipe axis O1. Furthermore, the material for forming the resin piping member 110 can be set arbitrarily, but in this embodiment, for example, it is formed by extrusion molding of hard polyvinyl chloride resin.

[0036] 3, the sheath pipe material 100P includes, for example, a plain end piping member 110P and a socket (receiving member, receiving portion) 120. That is, instead of the resin piping member 110 in the sheath pipe 100, the plain end piping member 110P is included.

[0037] As shown in FIG. 3, the plain end piping member 110P is a resin piping member (piping member) 110 in which an end portion 115 on one side F is a plain end portion 115P on one side F that has not been subjected to any processing. Specifically, the cylindrical cross section of the piping member 110 , which does not have the locking groove 315 formed on its outer circumferential surface, extends to the end surface 115 .

[0038] As shown in FIG. 3, the socket socket (receptacle member, socket portion) 120 is disposed at the end of the other side R of the plain end piping member 110P (piping member 110) and is made porous. In other words, the sheath pipe blank 100P is configured such that the receiving socket 120 is disposed on the other side R of the plain end piping member 110P, and one side F is the plain end portion 115P.

[0039] As shown in FIGS. 2 and 3, the resin piping member (piping member) 110 is formed, for example, in a cylindrical shape centered on a pipe axis O1. Furthermore, the material for forming the resin piping member 110 can be set arbitrarily, but in this embodiment, for example, it is formed by extrusion molding of hard polyvinyl chloride resin.

[0040] As shown in FIG. 4, the receptacle socket (receptacle member, receptacle portion) 120 includes, for example, a pipe insertion portion 121, a receptacle tube portion 122, a partition wall portion 123, and a locking claw portion 125, and is formed in a substantially cylindrical shape.

[0041] In addition, the pipe insertion portion 121, the partition wall portion 123, and the receiving tube portion 122 are arranged coaxially with the pipe axis O1, and are arranged in this order from one side F along the pipe axis O1 direction, and a through hole 120H is formed inwardly along the pipe axis O1.

[0042] The material from which the socket socket (receptacle member, socket portion) 120 is formed can be set arbitrarily, but in this embodiment, for example, it is formed by injection molding a hard polyvinyl chloride resin.

[0043] As shown in FIG. 4, the pipe insertion portion 121 is formed in a cylindrical shape with an opening 121A formed on one side F and an inner circumferential surface 121B having an inner diameter substantially equal to the outer diameter of the resin pipe member 110, for example. Into the pipe insertion portion 121, the other side R of the resin pipe member 110 (plain end piping member 110P) is inserted.

[0044] As shown in FIG. 4, the receiving tube portion 122 is formed, for example, in a substantially cylindrical shape with an opening 122A opening on the other side R and an inner circumferential surface 122B whose inner diameter is slightly larger than the outer diameter of the plastic piping member 110 into which another sheath tube 100 is inserted. In addition, the inner surface 122B of the receiving tube portion 122 may have a tapered portion that expands in diameter from one side F toward the opening 122A, and a chamfered portion (for example, 45° with respect to the tube axis O1) for guiding the end face of the other side R may be formed.

[0045] As shown in FIG. 4, the partition wall portion 123 is formed in a substantially ring shape having a smaller diameter than the inner diameter of the pipe insertion portion 121 and the receiving tube portion 122, for example. One side F of the partition wall portion 123 is formed with a one-side end face 123F that abuts against the other side R end face of the resin piping member 110 inserted from the opening 121A to position the resin piping member 110 in the pipe axis O1 direction.

[0046] Further, the other side R of the partition wall portion 123 may be formed with an other side end face 123R, which may be configured to abut against the end face 115 of the one side F of the sheath tube 100 inserted from the opening 122A. In addition, it is possible to arbitrarily set whether or not the end face of the resin piping member 110 is to abut against the one side end face 123F, and whether or not the one side end face 115 of another sheath tube 100 is to abut against the other side end face 123R.

[0047] As shown in FIG. 4, the locking claw portion 125 includes, for example, a locking claw main body 125A and an elastically deformable portion 125B in which the locking claw main body 125A is disposed, and has a shape extending along the pipe axis O1. As shown in FIG. 4, the locking claw portion 125 is, for example, arranged in the receiving tube portion 122 and is configured by a through-shape portion 126 formed penetrating from the outer circumferential side of the peripheral wall portion to the inner circumferential side (tube axis O1).

[0048] The locking claw main body 125A is disposed on one side F (tip side) of the locking claw portion 125, and is configured to protrude to the inner peripheral side (the tube axis O1 side). The surface of the locking claw body 125A on one side F is an locking end surface 125F formed perpendicular to the pipe axis O1.

[0049] The elastic deformation portion 125B is formed, for example, along the tube axis O1 direction, and is formed in a substantially flat plate shape that is slightly arcuate when viewed along the tube axis O1. The elastic deformation portion 125B is capable of elastically deforming in a radially outward direction on one side F (the tip side) in the direction of the tube axis O1. Moreover, the elastically deforming portion 125B that is elastically deformed outward can be restored to its original position by its elasticity.

[0050] As shown in FIG. 4, the through shape portion 126 is composed of, for example, a first through hole 126A arranged on both circumferential sides of the locking claw 125 and formed along the tube axis O1, and a second through hole arranged on one side of the locking claw 125 and connecting the first holes 126A on both sides.

[0051] Furthermore, by forming the through-hole portion 126, one side F of the locking claw 125 is elastically deformed due to the flexibility of the resin piping member 110, and the locking claw main body 125A is capable of being displaced radially outward. Moreover, the locking claw main body 125A displaced radially outward can be restored to its original position by the elasticity of the piping member.

[0052] 4, for example, four (plural) locking claws 125 are formed at intervals in the circumferential direction of the socket tube portion 122. The number and positions of the locking claws 125 can be set arbitrarily.

[0053] As shown in FIG. 5, the insertion portion 130 is disposed on one side F of the resin piping member 110, for example. As shown in FIG. 5, the insertion portion 130 is provided with a locking groove portion 135 formed, for example, at a position set from the end face 115 of one side F of the resin piping member 110 (specifically, at a position corresponding to the one side end face 125F of the locking claw 125).

[0054] The locking groove portion 135 is, for example, a groove formed over the entire circumferential direction of the outer circumferential surface of the resin piping member 110 by groove machining. Further, a side surface formed on one side F of the locking groove portion 135 toward the other end side R is formed, for example, perpendicular to the tube axis O1 and serves as a locking surface 135F that is engageable with the locking end surface 125F.

[0055] With this configuration, as shown in Figure 6, for example, the insertion portion 130 of the sheath tube 100A (100) located on one side F adjacent to the direction of the tube axis O1 can be inserted in the direction of arrow T1 into the receiving socket (receiving member, receiving portion) 120 of the sheath tube 100B (100) located on the other side R to join the sheath tube 100A and the sheath tube 100B, thereby forming a sheath tube joint (sheath tube joint structure) 10.

[0056] At this time, when the insertion portion 130 of the sheath tube 100A is inserted into the receiving socket (receiving member, receiving portion) 120 of the sheath tube 100B, when the locking portion main body 125A of the locking claw portion 125 comes into contact with the outer peripheral surface of the plastic piping member 110, the elastic deformation portion 125B elastically deforms and the locking portion main body 125A is displaced radially outward, and when the locking portion main body 125A reaches the locking groove portion 135, the elastic deformation portion 125B is restored to its original position by the biasing force, and the locking portion main body 125A is accommodated in the locking groove 135, and the locking claw portion 125 and the locking groove portion 135 engage with each other.

[0057] As shown in Figure 7, the sheath tube joint (sheath tube joint structure) 10 is configured, for example, by joining an insertion portion 130 of a sheath tube 100A (100) on one side F adjacent to the direction of the tube axis O1 to a receiving socket (receiving member, receiving portion) 120 of a sheath tube 100B (100) positioned on the other side R.

[0058] Specifically, the connection between the insertion portion 130 and the receiving socket (receiving member, receiving portion) 120 is achieved by inserting the insertion portion 130 of the sheath tube 100A into the receiving socket 120 (receiving member, receiving portion) of the sheath tube 100B, as shown in FIG. 7, so that the locking end surface 125F of the locking claw portion 125 of the receiving socket 120 of the sheath tube 100B engages and gets caught with the locking surface 135F of the locking groove portion 135 of the insertion portion 130 of the sheath tube 100A, thereby locking the sheath tube 100A and the sheath tube 100B in the direction of the tube axis O1.

[0059] The number of sheath tubes (which may include an adjustable sheath tube) 100 constituting the sheath tube joint (sheath tube joint structure) 10 is not limited to two and may be set arbitrarily.

[0060] [Sheath tube insertion part forming tool] Hereinafter, with reference to FIG. 8, an example of the sheath insertion portion forming tool according to the first embodiment will be described. Fig. 8 is a conceptual diagram for explaining a schematic configuration of the sheath tube insertion portion forming tool according to the first embodiment. The two-dot chain line shown in Fig. 8 indicates the plain end 115P of the resin piping member 110 (plain end piping member 110P). In Fig. 8, reference numeral 20 indicates the sheath tube insertion portion forming tool, reference numeral 21 indicates a tool body holder, reference numeral 22 indicates a piping guide portion, reference numeral 26 indicates a groove machining tool (cutting tool), and reference numeral 28 indicates a chamfering tool.

[0061] As shown in FIG. 8, the sheath insertion portion forming tool 20 includes, for example, a tool body holder 21, a pipe guide portion 22, a groove machining tool (cutting tool) 26, and a chamfering tool 28.

[0062] As shown in FIG. 8, the tool body holder 21 is formed, for example, in the shape of a multi-stage cylindrical member with a bottom and centered on an axis O2. In addition, in the tool body holder 21, a pipe guide portion 22, a groove machining tool (cutting tool) 26, and a chamfering tool 28 are arranged. As shown in FIG. 8, the axis O2 is arranged coaxially with the tube axis O1 when the sheath tube blank 100P is set.

[0063] As shown in FIG. 8, the pipe guide portion 22 is, for example, configured by a cylindrical portion formed inside the tool body holder 21 coaxially with the axis O2. The piping guide portion 22 is formed to have a diameter slightly smaller than the inner peripheral surface of the resin piping member 110 (the plain end piping member 110P) so as to be insertable into the resin piping member 110. As shown in FIG. As shown in FIG. 8, the pipe guide portion 22 is adapted to be in sliding contact with, for example, the inner circumferential surface of the resin pipe member 110, and is adapted to rotate the resin pipe member 110 around the pipe axis O1 (axis line O2).

[0064] The groove machining tool (cutting tool) 26 is disposed on the peripheral wall of the tool body holder 21 with its cutting edge facing the pipe axis O1. The sheath pipe material 100P is configured to be capable of coming into contact with the outer surface of the sheath pipe material 100P set in the piping guide portion 22. Further, the groove cutting tool (cutting tool) 26 is configured to be movable (advance) from the outer surface of the sheath tube blank 100P toward the tube axis O1 by operating a groove cutting tool operating portion (not shown). Then, the groove machining tool (cutting tool) 26 advances toward the tube axis O1 side, whereby the locking groove 135 is formed.

[0065] As shown in FIG. 8, the chamfering blade 28 is disposed on the base end side (one side F) of the pipe guide portion 22 with its cutting edge directed toward the plain end portion 115P of the pipe member 110P of the sheath pipe material 100P. Then, by rotating the sheath tube material 100P spirally around the tube axis O1 and cutting the end of the plain end portion 115P with a chamfering tool 28, it is possible to form an inner side chamfered portion 115C at the end of the plastic piping member 110.

[0066] [Method of manufacturing sheath tube and sheath tube joint (sheath tube joint structure)] Next, a method for producing a sheath tube according to the first embodiment will be described with reference to Figs. 3, 8, and 9A to 9D. 9A to 9D are conceptual diagrams for explaining an outline of the sheath tube manufacturing method according to the first embodiment, in which FIG. 9A shows the state in which a plain end portion of a sheath tube material is inserted into a sheath tube insertion portion forming tool, FIG. 9B shows the state in which a chamfered portion is formed on the sheath tube, FIG. 9C shows the state in which a groove is machined into the insertion portion, and FIG. 9D shows the state in which formation of the insertion portion is completed. As shown in FIGS. 9A to 9D, the sheath tube 10 can be manufactured by the following procedure.

[0067] (1) First, a sheath tube material 100P shown in FIG. 3 is prepared. At this time, if the sheath tube material 100P needs to be made into an adjustable sheath tube, the plain end portion 115P is cut and removed by the length that will be excess in the adjustable sheath tube.

[0068] (2) Next, as shown in FIG. 9A, the plain end portion 115P of the sheath tube blank 100P is inserted into the sheath tube insertion portion forming tool 20 along the tube axis O1 (axis line O2). Specifically, the pipe guide portion 22 is inserted into one side F of the plain end portion 115P.

[0069] (3) Next, as shown in FIG. 9B, a spiral motion is made in the direction of arrow R1 until a position corresponding to the locking groove portion 135 in the tube axis O1 direction of the plain end portion 115P of the sheath tube material 100P is reached, and an inner chamfered portion (not shown) is formed at the end of the plain end portion 115P using the chamfering tool 28.

[0070] (4) After the inner circumferential chamfer (not shown) is formed, a groove machining tool (cutting tool) 26 is placed so as to come into contact with the outer circumferential surface of the plain end piping component 110P, as shown in FIG. 9C. Then, the tool body holder 21 is rotated in the direction of arrow R2 relative to the sheath pipe material 100P. In addition, a groove cutting tool operating part (not shown) is operated to advance the groove cutting tool (cutting tool) 26 toward the inner circumference side (pipe axis O1, axis O2) to cut the outer circumference surface of the plain end piping member 110P to process a groove, thereby locking the locking groove portion 135. By carrying out the above steps (1) to (4), the sheath tube (including the adjustable sheath tube) 100 can be manufactured.

[0071] (5) For the sheath tube 100 produced in this manner, as shown in Figure 6 above, the insertion portion 130 of the sheath tube 100A on one side F in the direction of the tube axis O1 can be inserted into the receiving socket (receiving member, receiving portion) 120 of the sheath tube 100B on the other side R in the direction of arrow T1, thereby manufacturing the sheath tube joint (sheath tube joint structure) 10.

[0072] The sheath tube according to the present invention includes a piping member made of synthetic resin, an insertion portion disposed on one side of the piping member in the axial direction, and a receptacle portion disposed on the other side of the piping member in the axial direction, the receptacle portion having a locking claw portion into which the insertion portion can be inserted and which locks the insertion portion. The insertion portion is configured with a locking groove portion disposed at a set position from the end face on one side of the piping member and formed around the circumferential surface. When the insertion portion is inserted to a predetermined depth in the socket, the locking claw portion engages with the locking groove portion to lock the insertion portion so that it does not come out. Therefore, even if the insertion portion does not have a plug socket (a so-called male socket), the insertion portion of a sheath tube and the receptacle portion of another sheath tube can be efficiently joined together. Furthermore, when constructing the sheath pipe joint structure, the insertion portion can be formed easily and efficiently even on-site. As a result, it is possible to easily and efficiently manufacture a sheath tube joint structure in which a plurality of sheath tubes are joined in the tube axial direction. Furthermore, adjustable sheaths and tubes of desired lengths can be manufactured easily and efficiently.

[0073] Furthermore, since the plug-in portion is directly formed in the piping member, the plug-in portion can be formed in a desired position and installation can be completed in a short period of time. Furthermore, since there is no need to use a plug-in socket, the construction costs of the sheath pipe joint structure can be reduced. In addition, when manufacturing an adjustable sheath pipe that can be adjusted to a specified length, there is no need to use a joining part (adhesive sheath pipe socket), so there is no need to wait for the adhesive to harden, which reduces the number of manufacturing steps and shortens the construction time, making it applicable to construction projects with short construction times. In addition, when manufacturing an adjustment sheath pipe (short pipe), there is no need to use an adhesive sheath pipe socket, which reduces costs. Furthermore, by not using adhesive sheaths or sockets, all sheaths or sockets installed in the pipeline can be recycled.

[0074] According to the sheath tube 100, sheath tube joint (sheath tube joint structure) 10, and sheath tube joint (sheath tube joint structure) manufacturing method of the first embodiment, the insertion portion 130 is positioned at a set position from the end face of one side F of the piping member 110 and is composed of a locking groove portion 135 formed circumferentially on the outer circumferential surface, so that the insertion portion 130 can be easily and efficiently formed in the plain end piping member 110P. Therefore, even if the plug-in portion does not have a plug-in socket (a so-called male socket), the plug-in portion of sheath tube 100A and the receiving socket 120 of sheath tube 100B can be efficiently joined together.

[0075] Furthermore, according to the sheath tube 100, the sheath tube joint (sheath tube joint structure) 10, and the method for manufacturing the sheath tube joint (sheath tube joint structure), when the sheath tube joint 10 is made and installed, the insertion portion can be formed easily and efficiently even on site. As a result, the sheath tube joint 10 in which a plurality of sheath tubes 100 are joined in the tube axis O1 direction can be manufactured easily and efficiently. Furthermore, adjustable sheaths and tubes of desired lengths can be manufactured easily and efficiently.

[0076] Furthermore, according to the sheath tube 100 and the sheath tube joint (sheath tube joint structure) 10, the insertion portion 130 is formed directly in the plastic piping member 110, so that the insertion portion 130 can be formed at the desired position and installed in a short time. Furthermore, since there is no need to use a plug-in socket (male socket, not shown), the installation cost of the sheath tube joint 10 can be reduced.

[0077] Furthermore, according to the sheath tube 100 and the sheath tube joint (sheath tube joint structure) 10, there is no need to use a jointing member (adhesive sheath tube socket, not shown) when manufacturing the adjustable sheath tube 100, so there is no need to wait for the adhesive to harden, which reduces the number of manufacturing steps and shortens the construction time, making it applicable to construction projects with short construction times.

[0078] In addition, according to the sheath tube 100 and the sheath tube joint (sheath tube joint structure) 10, there is no need to use an adhesive sheath tube socket when manufacturing an adjustable sheath tube (short tube), thereby reducing costs. Furthermore, by not using adhesive sheaths or sockets, all sheaths or sockets installed in the pipeline can be recycled.

[0079] The sheath tube insertion portion forming tool 20 of the first embodiment is equipped with a piping guide portion 22 and a cutting blade 26 capable of cutting the piping member 100P, so that the piping member 100 is rotated around the pipe axis O1 by the piping guide portion 22 and the cutting blade 26 is brought into contact with the outer peripheral surface of the rotating piping member 100, thereby easily and efficiently machining a groove into one side F of the piping member 100 to form the locking groove portion 135.

[0080] Furthermore, the sheath tube insertion portion forming tool 20 is equipped with a chamfering tool 28 that forms an inner chamfered portion at the end of the piping member 110P, so that when forming the locking groove portion 135, the inner chamfered portion 115C can be efficiently formed at the end 115 of the piping member 110P.

[0081] <Second embodiment> Hereinafter, with reference to FIG. 10, a pipe insertion portion forming tool according to a second embodiment of the present invention will be described. FIG. 10 is a conceptual diagram illustrating a schematic configuration of a sheath insertion portion forming tool according to the second embodiment of the present invention. In FIG. 10, reference numeral 30 denotes a sheath pipe insertion portion forming tool, reference numeral 32 denotes a pipe holding roll (pipe guide portion), reference numeral 36 denotes a groove processing tool (cutting tool), and reference numeral 38 denotes a chamfering tool.

[0082] As shown in Figure 10, the sheath pipe insertion portion forming tool 30 of the second embodiment includes, for example, a tool body holder 31, a pipe holding roll (piping guide portion) 32, a groove processing tool (cutting tool) 36, and a chamfering tool 38.

[0083] As shown in FIG. 10, the tool body holder 31 holds, for example, a pipe holding roll (piping guide portion) 32, a groove machining blade (cutting blade) 36, and a chamfering blade 38.

[0084] As shown in FIG. 10, the pipe holding roll (piping guide portion) 32 is, for example, a roll that is erected from the tool body holder 31 and is rotatable about a rotation axis 3J centered on an axis line O3. Further, the piping support roll (piping guide portion) 32 is formed, for example, to have an outer diameter substantially equal to the inner diameter of the plain end piping member 110P of the sheath pipe material 100P. The lubricant is capable of being inserted into the resin piping member 110 (plain end piping member 110P), and is capable of holding the resin piping member 110 by friction with the inner peripheral surface of the inserted resin piping member 110 (plain end piping member 110P). As shown in FIG. 10, the axis O3 is arranged coaxially with the tube axis O1 when the sheath tube blank 100P is set.

[0085] As shown in FIG. 10, the groove machining tool (cutting tool) 36 is disposed in the groove machining tool holder 31A of the tool body holder 31 with its cutting edge facing the pipe axis O1. The roller 31 is configured to be capable of contacting the outer surface of the sheath tube material 100P set on the pipe holding roll (piping guide portion) 32. In addition, the groove machining tool (cutting tool) 36 is configured to rotate the sheath tube material 100P around the tube axis O1 in the direction of arrow R3, and by operating the groove machining tool operating part 37, it is possible to advance the groove machining tool 36 from the outer surface of the sheath tube material 100P toward the tube axis O1 to form an engagement groove 135 on the outer surface of the sheath tube material 100P.

[0086] The chamfering blade 38 is disposed on the base end side base plate portion 32A on one side F of the pipe holding roll (piping guide portion) 32, with the cutting edge facing the plain end portion 115P of the pipe member 110P of the sheath pipe material 100P. Then, when the sheath pipe material 100P is rotated around the pipe axis O1 in the direction of arrow R3 and moved in the direction of the pipe axis O1 to be set on the piping holding roll (piping guide portion) 32, the end of the plain end portion 115P is cut, so that an inner side chamfered portion (not shown) can be formed at the end of the plastic piping member 110.

[0087] According to the sheath pipe insertion portion forming tool 30 of the second embodiment, the piping member 100P is picked by the piping holding roll (piping guide portion) 32, so that it can be stably rotated around the pipe axis O1, and a locking groove portion 135 of stable quality can be easily and efficiently formed in the piping member 100.

[0088] <Third embodiment> Hereinafter, a pipe insertion portion forming tool according to a third embodiment of the present invention will be described with reference to Figs. 11A and 11B. 11A and 11B are conceptual diagrams illustrating the general configuration of a sheath tube insertion portion forming tool in accordance with a third embodiment of the present invention, where FIG. 11A is a conceptual diagram viewed along the tube axis O1, and FIG. 11B is a conceptual diagram viewed from the side. In Figs. 11A and 11B, reference numeral 40 denotes a sheath pipe insertion portion forming tool, reference numeral 42 denotes a pipe guide portion, reference numeral 46 denotes a groove processing tool (cutting tool), and reference numeral 48 denotes a chamfering tool.

[0089] A sheath pipe insertion portion forming tool 40 according to the third embodiment includes, for example, a pipe guide portion 42, a groove machining tool (cutting tool) 46, and a chamfering tool 48, as shown in FIGS. 11A and 11B.

[0090] As shown in FIGS. 11A and 11B, the tool body holder 41 is a base member on which the pipe guide portion 42, the groove machining blade (cutting blade) 46, and the chamfering blade 48 are arranged.

[0091] As shown in FIGS. 11A and 11B, the pipe guide portion 42 includes, for example, an inner peripheral surface clamping roll (piping guide portion) 43 and an outer peripheral clamping roll (piping guide portion) 44.

[0092] As shown in Figures 11A and 11B, the inner surface clamping roll (piping guide portion) 43 is, for example, a roll that is erected from the tool body holder 41 and is rotatable around a rotation axis 43J centered on an axis O43. Further, the pipe guide portion 42 is formed so that its outer diameter is smaller than the inner diameter of the plain end piping member 110P.

[0093] As shown in Figures 11A and 11B, the outer periphery clamping roll (piping guide portion) 44 includes, for example, a first outer periphery clamping roll (piping guide portion) 44A erected from the tool body holder 41, and a second outer periphery clamping roll (piping guide portion) 44B.

[0094] The first outer periphery clamping roll (piping guide portion) 44A is a roll that is rotatable around a rotation axis 44AJ centered on an axis line O44A. The second outer periphery clamping roll (piping guide portion) 44B is a roll that is rotatable around a rotation shaft 44BJ centered on an axis O44B.

[0095] Moreover, the axis O43, the axis O44A, and the axis O44B are arranged parallel to the tube axis O1 when the sheath tube blank 100P is set in the sheath tube insertion portion forming tool 40, as shown in Figs. 11A and 11B. When the sheath pipe material 100P is set in the sheath pipe insertion portion forming tool 40, the inner peripheral surface clamping roll (piping guide portion) 43 is disposed on the inner peripheral side of the plain end piping member 110P of the sheath pipe material 100P. Further, the outer peripheral surface clamping rolls (piping guide portions) 44 (44A, 44B) are disposed on the outer peripheral side of the plain end piping member 110 of the sheath pipe material 100P.

[0096] The inner surface clamping roll (piping guide portion) 43 and the outer surface clamping roll (piping guide portion) 44 (44A, 44B) are configured to clamp the plain end piping member 110P of the sheath pipe material 100P from the inner and outer sides and guide the rotation of the plain end piping member 110P around the pipe axis O1.

[0097] As shown in FIGS. 11A and 11B, the groove machining tool (cutting tool) 46 is disposed in a groove machining tool holder 41A of the tool body holder 41 with its cutting edge facing the tube axis O1. The sheath pipe material 100P is configured to be capable of coming into contact with the outer surface of the sheath pipe material 100P set in the piping guide portion 42. In addition, the groove machining tool (cutting tool) 46 is configured to be movable from the outer surface of the sheath tube blank 100P toward the tube axis O1 by operating a groove machining tool operating portion 47.

[0098] As shown in FIG. 11B, the chamfering blade 48 is disposed on the tool body holder 41 with its cutting edge facing the plain end portion 115P of the piping member 110P of the sheath pipe material 100P. Then, by rotating the sheath tube material 100P around the tube axis O1 and cutting the end of the plain end portion 115P with a chamfering tool 48, it is possible to form an inner side chamfer (not shown) at the end of the plastic piping member 110.

[0099] According to the sheath tube insertion portion forming tool 40 of the third embodiment, the piping guide portion 42 is equipped with an inner surface clamping roll (piping guide portion) 43 and an outer surface clamping roll (piping guide portion) 44, so that the piping member 100P can be stably rotated around the pipe axis O1, and a locking groove portion 135 of stable quality can be easily and efficiently formed on one side F of the piping member 100.

[0100] In addition, since the sheath tube insertion portion forming tool 40 is equipped with a chamfering tool 48, an inner chamfered portion (not shown) can be efficiently formed on the end portion 115 of the piping member 110P when forming the locking groove portion 135.

[0101] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

[0102] For example, in the above embodiment, a sheath tube connection body (sheath tube connection structure) 10 in which two (multiple) sheath tubes 100 are connected has been described, but the number of sheath tubes 100 constituting the sheath tube connection body 10 may be set arbitrarily.

[0103] In addition, in the above embodiment, a case has been described in which the receiving portion of the sheath tube 100 is configured by a receiving socket (receiving member, receiving portion) 130. However, instead of the receiving socket, a receiving portion of another configuration may be provided, and for example, the plastic piping member 100 may be configured such that the locking claw portion 125 is directly formed thereon.

[0104] Moreover, the configurations of the locking claw portion and the locking groove portion are not limited to the locking claw portion 125 and the locking groove portion 135, and may be arbitrarily set within the scope of the spirit of the present invention.

[0105] In the above embodiment, the sheath tube insertion portion forming tools 20, 30, and 40 were used as examples for forming the locking groove portion 135 in the sheath tube material 100P, but the tools are not limited to the sheath tube insertion portion forming tools 20, 30, and 40 and can be set arbitrarily.

[0106] For example, in the above embodiment, the sheath insertion portion forming tools 20, 30, 40 are described as being equipped with the groove cutting tools (cutting tools) 26, 36, 46 and the chamfering tools 28, 48, but it is possible to arbitrarily set whether or not to equip the chamfering tools 28, 48, and the configuration may include only the groove cutting tools (cutting tools) 26, 36, 46 without the chamfering tools 28, 48. Also, configurations other than the groove cutting tools (cutting tools) 26, 36, 46 and the chamfering tools may be added.

[0107] In addition, in the above embodiment, the sheath tube insertion portion forming tool 20, 30, 40 has been described as forming, for example, an inner chamfered portion in the piping member 110P, but the configuration may also include a chamfering tool that forms an outer chamfered portion instead of or together with the inner chamfered portion.

[0108] In the above embodiment, the locking groove 135 of the sheath tube 10 is formed by the sheath tube insertion portion forming tools 20, 30, 40. However, the locking groove 135 may be formed in a factory, for example. Also, the sheath tube joint (sheath tube joint structure) 10 may be formed using a sheath tube 10 manufactured in a factory.

[0109] In addition, in the above embodiment, a case has been described in which the plain end portion 115P side is cut and removed to adjust the length to a set length when forming the sheath tube 100. However, it is possible to arbitrarily set whether or not to cut and remove the plain end portion 115P side, and the locking groove portion 135 may be formed by directly machining a groove in the plain end portion 115P of the sheath tube material 100P without cutting or removing it.

[0110] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate. [Explanation of symbols]

[0111] O1 tube shaft F One side R Other side 1 Cable conduit protection structure 2 Buried pipes 3, 4, 10 Sheath tube joint (Sheath tube joint structure) 100 Sheath 110 Plastic piping components (piping components) 110P Plain End Piping Components 115 End face 115P Plain end part 120 Socket (receptacle member, socket part) 125 Locking claw 130 Insertion part 135 Locking groove 135S Engagement groove formation planned portion (position corresponding to engagement groove) 20, 30, 40 Sheath tube insertion part forming tool 22 Pipe guide section 26, 36, 46 Grooving tool (cutting tool) 28, 38, 48 Chamfering tool 32 Pipe holding roll (pipe guide part) 42 Pipe guide section 43 Inner surface clamp roll (piping guide part) 44, 44A, 44B Outer circumference clamp roll (piping guide part)

Claims

1. A sheath pipe having a piping member made of synthetic resin, an insertion portion arranged on one side of the piping member in a pipe axis direction, and a socket portion arranged on the other side of the piping member in the pipe axis direction, into which the insertion portion can be inserted and having a locking claw portion for locking the insertion portion, and into which a cable is housed, The piping member and the insertion portion are integrally formed by extrusion molding, The insertion portion is The locking groove is disposed at a set position from the end face on the one side of the piping member, and is formed in the circumferential direction on the outer circumferential surface of the piping member. The locking groove is engageable with the locking claw. The locking groove is also formed by cutting an end of the piping member. A sheath tube characterized by:

2. 2. The sheath tube of claim 1, The receiving portion is The locking claws are formed in a cylindrical wall portion made of synthetic resin and are displaceable radially outward by elastic deformation. The locking claws are arranged at intervals in the circumferential direction of the cylindrical wall portion, and the piping member is inserted and joined to the receiving member. A sheath tube characterized by:

3. A sheath tube joint structure, which is formed by joining a plurality of sheath tubes according to claim 1 or 2 in the tube axial direction.

4. A method for manufacturing the sheath tube joint structure according to claim 3, comprising the steps of: a sheath pipe material is prepared, the one side of the sheath pipe material being a plain end portion in which a cylindrical cross section of the piping member extends to an end face, and the other side of the sheath pipe material is provided with the receiving portion; a cutting blade is disposed at a position corresponding to the engagement groove portion of the piping member, the sheath tube material and the cutting blade are rotated relatively around the tube axis, and the cutting blade is advanced from the outer peripheral surface of the piping member toward the tube axis to cut the piping member and machine a groove in the piping member to form a sheath tube having the insertion portion on the one side; A method for manufacturing a sheath pipe connection structure, characterized in that the insertion portion is inserted into the receiving portion of another sheath pipe along the pipe axial direction, and the locking claw portion is engaged with the locking groove portion to join the sheath pipe connection structure.

5. The method for manufacturing the sheath tube joint structure according to claim 4, When adjusting the length of the sheath tube joint body consisting of a plurality of sheath tubes joined by the sheath tube joint structure in the tube axis direction, The plain end portion of the sheath pipe material to be adjusted in length is cut and removed to adjust the length to a set value, and then a groove is formed in the piping member. A method for manufacturing a sheath tube joint structure.

6. A sheath tube insertion portion forming tool for forming the insertion portion of the sheath tube according to claim 1 or 2, a pipe guide portion that guides the pipe member so as to be rotatable around the pipe axis; a cutting tool capable of cutting an outer surface of the piping member rotated around the pipe axis; a chamfering blade for forming at least the inner chamfered portion and the outer chamfered portion on the end of the piping member which is rotated around the pipe axis.

Images