Joint, piping structure, and construction method for piping

Abstract

To easily visually discover a construction defect during construction (before a hydraulic pressure test).SOLUTION: A joint comprises: a joint main body 11; a body 21 in which an end on a first side D1 in an axial direction is mounted to the joint main body 11 from the outside in a radial direction and a clearance S1 is provided between an inner peripheral surface of a portion positioned on a second side D2 in the axial direction rather than the end and an outer peripheral surface of the joint main body 11; and a guide ring 41 which is disposed in the clearance S1 movably to the first side D1. The body 21 comprises: an outer body member 22 including a first portion 22a which is mounted to the joint main body 11 from the outside in the radial direction and constitutes the end, and a second portion 22b which extends from the first portion 22a to the second side D2 and of which the inner diameter is larger than an outer diameter of the joint main body 11; and an inner body member 23 which is mounted to the second portion 22b from the inside in the radial direction and of which the inner diameter is larger than the outer diameter of the joint main body 11. The second portion 22b of the outer body member 22 and the inner body member 23 are transparent.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint, a piping structure, and a piping installation method. [Background technology]

[0002] Conventionally, joints have been considered to prevent water leakage due to insufficient pipe insertion. For example, the joint disclosed in Patent Document 1 is said to be able to reliably detect insufficient pipe insertion by performing a water pressure test after installation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-185076 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of joint, it is desirable to improve the visibility of insertion so that imperfections in installation can be easily detected visually during installation (before the water pressure test).

[0005] The present invention has been made in consideration of these problems, and has as its object to provide a joint in which construction defects can be easily detected visually during construction (before a water pressure test). [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The cap of the present invention comprises a fitting body, a body whose end on a first axial side is attached to the fitting body from the outside in the radial direction, with a gap provided between the inner peripheral surface of a portion located on a second axial side of the end and the outer peripheral surface of the fitting body, and a guide ring arranged in the gap so as to be movable toward the first side, wherein the body comprises an outer body member having: a first portion attached to the fitting body from the outside in the radial direction and constituting the end; and a second portion extending from the first portion to the second side and having an inner diameter larger than the outer diameter of the fitting body; and an inner body member attached to the second portion from the inside in the radial direction and having an inner diameter larger than the outer diameter of the fitting body, wherein the second portion of the outer body member and the inner body member are transparent. [Effects of the Invention]

[0007] According to the joint of the present invention, construction defects can be easily detected visually during construction (before the water pressure test). [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a joint according to a first embodiment of the present invention. [Figure 2] 2 is a cross-sectional view showing a process of inserting a pipe into the joint shown in FIG. 1. [Figure 3] 2 is a cross-sectional view showing a state in which a pipe has been inserted into the joint shown in FIG. 1. FIG. [Figure 4] FIG. 4 is a cross-sectional view of a joint according to a second embodiment of the present invention. [Figure 5] 5 is a cross-sectional view showing a state in which the pipe has been inserted into the joint shown in FIG. 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) A first embodiment of a capped joint according to the present invention will be described below with reference to FIGS. 1 to 3. FIG. As shown in Fig. 1, the capped fitting 1 of this embodiment includes a fitting 10 and a cap 50. As shown in Figs. 2 and 3, the fitting 10 is connected to a first pipe 100A and a second pipe 100B. The fitting 10 and the pipes 100A, 100B form a piping structure 60. The piping structure 60 forms various types of piping equipment, not shown, such as water supply pipes, drainage pipes (sewer pipes), gas pipes, and air conditioning pipes. The piping location of the piping structure 60 is typically a dark or narrow space, such as under the floor of a building.

[0010] Fig. 1 shows an incomplete connection state in which a second pipe 100B is not connected to the joint 10. As shown in Fig. 1, the joint 10 includes a joint main body 11, a body (outer cylindrical portion) 21, a retaining member 31, and a guide ring (annular member) 41. Here, the joint main body 11 and the body 21 are formed in a cylindrical shape, and the retaining member 31 and the guide ring 41 are formed in an annular shape. The central axes of the joint main body 11, the body 21, the retaining member 31, and the guide ring 41 are arranged coaxially with a common axis. Hereinafter, the common axis will be referred to as the axis O. The direction along the axis O will be referred to as the axis O direction (axial direction). The direction perpendicular to the axis O will be referred to as the radial direction, and the direction going around the axis O will be referred to as the circumferential direction.

[0011] The joint body 11 includes a first connecting portion 12 and a second connecting portion (inner cylindrical portion) 13. These connecting portions 12, 13 are each formed in a cylindrical shape. The connecting portions 12, 13 are arranged coaxially with the axis O and are connected in a row along the direction of the axis O. Hereinafter, in the direction of the axis O, the side of the first connecting portion 12 relative to the second connecting portion 13 will be referred to as the tip side D1 (first side), and the side of the second connecting portion 13 relative to the first connecting portion 12 will be referred to as the base side D2 (second side). The base side D2 is opposite the tip side D1 in the direction of the axis O. For example, the connection parts 12 and 13 are made of a metal such as gunmetal. The outer peripheral surface of the first connection part 12 may be formed with, for example, a male thread 12a. The second connecting portion 13 is longer than the first connecting portion 12 and has a smaller outer diameter than the first connecting portion 12. A plurality of grooves 13a are formed on the outer peripheral surface of the second connecting portion 13. The plurality of grooves 13a are grooves (annular grooves) extending in the circumferential direction. The plurality of grooves 13a are formed at intervals from one another in the direction of the axis O. A seal member 14 such as an O-ring is disposed in each groove 13a. The seal member 14 protrudes radially outward from the groove 13a. If the seal member 14 becomes detached from the groove 13a, for example, an operator may visually check it from the outside through a visible area R described below.

[0012] The body 21 is disposed radially outside the second connecting portion 13 and coaxially with the second connecting portion 13. An annular gap S1 is formed between the body 21 and the second connecting portion 13. An end portion on the tip side D1 of the body 21 is attached to the joint main body 11 from the radial outside, and the gap S1 is provided between the inner circumferential surface of a portion located on the base end side D2 from this end portion and the outer circumferential surface of the joint main body 11 (second connecting portion 13). The body 21 includes an outer body member 22, an inner body member 23, and a lock ring 24. The outer body member 22 is formed of a transparent resin such as transparent nylon. A tip end 22a (first portion) of the outer body member 22 is fixed to the outer peripheral surface of the tip end of the second connecting portion 13. The tip end 22a of the outer body member 22 forms an end portion of the tip side D1 of the body 21. A portion (second portion) of the outer body member 22 extending from the tip end 22a to the base end side D2 is a large diameter portion 22b that is larger in diameter than the tip end portion 22a. The inner diameter of the large diameter portion 22b is larger than the outer diameter of the fitting body 11 (second connecting portion 13). As described above, the tip portion 22a of the outer body member 22 is fixed to the tip portion of the second connecting portion 13. In the second connecting portion 13, the portion located on the base end side D2 relative to the tip portion has a smaller diameter than the tip portion, and a step portion 15 is formed between the tip portion and the portion located on the base end side D2 relative to the tip portion. The step portion 15 is annular and faces the base end side D2.

[0013] The inner body member 23, like the outer body member 22, is made of a transparent resin. The inner body member 23 is housed inside the outer body member 22 in a portion on the base end side D2. The inner body member 23 is attached to the large diameter portion 22b of the outer body member 22 from the radially inner side. The inner diameter of the inner body member 23 is larger than the outer diameter of the joint body 11 (second connection portion 13). The tip end (end of the tip end side D1) of the inner body member 23 is located closer to the base end side D2 than the tip end side D1 end of the large diameter portion 22b of the outer body member 22. The inner body member 23 includes an annular inner body main body 23a and a plurality of tapping portions 23b. Each tapping portion 23b is formed in a cantilever shape and extends from the inner body main body 23a toward the tip side D1. The plurality of tapping portions 23b are arranged at intervals from one another in the circumferential direction. A tapping protrusion 23c is provided at the tip of each tapping portion 23b so as to protrude radially inward. A cylindrical lock ring 24 is fitted onto the base end of the outer body member 22. The lock ring 24 may be made of, for example, a transparent resin or an opaque resin.

[0014] The retaining member 31 prevents the second pipe 100B, which is disposed in the gap S1, from slipping out toward the base end side D2, as will be described later. The retaining member 31 includes an annular flange portion 32 and a retaining portion 33. The flange portion 32 is fixed by being sandwiched between the body members 22, 23 and the lock ring 24. The lock ring 24 holds the retaining member 31 between itself and the inner body member 23. The retaining portion 33 is formed integrally with the inner peripheral edge of the flange portion 32. The retaining portion 33 is formed in a tapered shape that decreases in diameter from the flange portion 32 toward the tip side D1.

[0015] The guide ring 41 is disposed coaxially with the second connecting portion 13 and the body 21 between the second connecting portion 13 and the body 21 of the joint 10 (in the gap S1). The guide ring 41 includes a movable main body portion 42 and a guide portion 43. The movable main body portion 42 is formed in an annular shape. An annular guide portion 43 is provided on the tip surface of the movable main body portion 42. The guide portion 43 includes a guide surface 43a and a step 43b. A cross section of the guide portion 43 taken along a plane including the axis O is wedge-shaped. The outer peripheral surface of the guide portion 43 forms the guide surface 43a. The guide surface 43a is formed in a tapered shape that increases in diameter toward the base end side D2. The outer diameter of the base end of the guide surface 43a is larger than the outer diameter of the movable main body portion 42. A step 43b is formed between the guide surface 43a and the outer peripheral surface of the movable main body portion 42. The guide ring 41 is slidable in the direction of the axis O within the gap S1. The guide ring 41 is arranged in the gap S1 so as to be movable toward the tip side D1. In the initial state of the capped joint 1 (the state before the cap 50 is removed), the guide ring 41 is positioned radially inward relative to the lock ring 24 and does not protrude toward the tip side D1 relative to the lock ring 24. In this embodiment, the cap 50 prevents the lock ring 24 from coming out of the gap S1.

[0016] The cap 50 is, for example, a dustproof cap for the base end of the joint 10. The cap 50 includes a substrate (base material) 51 and a protrusion 61. In the present embodiment, the substrate 51 is formed in a disk shape. In the illustrated example, the substrate 51 contacts the body 21 (lock ring 24) from the base end side D2 of the body 21. The protrusion 61 protrudes from the substrate 51 toward the tip end side D1. The protrusion 61 is formed in a tubular shape. The protrusion 61 is disposed between the base end (second connection portion 13) of the joint main body 11 and the base end of the body 21 (for example, in the gap S1). The protrusion 61 is attached to the base end of the joint main body 11 from the radial outside. The protrusion 61 is detachably attached (fitted) to the joint main body 11. The protrusion 61 may restrict movement of the guide ring 41 toward the base end side D2.

[0017] Here, the transparency and color of the body 21 will be described. In this embodiment, the outer body member 22 (large diameter portion 22b) and the inner body member 23 are transparent. The transparency of the outer body member 22 and the inner body member 23 is such that, for example, the guide ring 41 can be seen through the outer body member 22 and the inner body member 23 from outside the joint 10. The outer body member 22 (large diameter portion 22b) and the inner body member 23 may be colorless and transparent, or colored and transparent. For example, the outer body member 22 may be colorless and transparent, and the inner body member 23 may be colored and transparent. In this case, the color of the inner body member 23 may be a complementary color to the guide ring. In this embodiment, the lock ring 24 may be transparent or opaque. If the lock ring 24 is transparent, the entire body 21 is transparent. On the other hand, if the lock ring 24 is opaque, the degree of opacity of the lock ring 24 may be such that the guide ring 41 cannot be seen through the lock ring 24 from outside the joint 10, for example.

[0018] In the joint 10 as described above, the guide ring 41 is visible from outside the joint 10 at least through the visible region R of the body 21. When the entire body 21 is transparent, the visible area R is provided over the entire area of ​​the body 21. On the other hand, when the lock ring 24 is opaque, as shown in FIGS. 1 to 3 , the visible area R is, for example, an area where the large diameter portion 22b of the outer body member 22 is located, and is located distally D1 from the lock ring 24 and proximally D2 from the step 15. In this case, the visible area R includes a first area R1 and a second area R2. The first area R1 is an area located distally D1 from the lock ring 24 and proximally D2 from the distal end of the inner body member 23. In the first area R1, the guide ring 41 can be seen through both the outer body member 22 (large diameter portion 22b) and the inner body member 23. The second area R2 is an area located distally D1 from the first area R1. The second area R2 is an area located distally D1 from the inner body member 23 and proximally D2 from the step 15. In the second region R2, the lock ring 24 is visible through only the outer body member 22 (large diameter portion 22b) of the outer body member 22 (large diameter portion 22b) and the inner body member 23.

[0019] The following describes the procedure for connecting pipes 100A, 100B to the above-described capped joint 1 (a piping construction method for assembling the joint 10 and the second pipe 100B). In the following, it is assumed that the initial state is one in which the cap 50 is attached to the joint 10 as described above.

[0020] In this initial state, the guide ring 41 is located on the proximal side D2 (inside the lock ring 24) of the visible area R. Therefore, if the entire body 21 is transparent, the guide ring 41 is visible, but if the lock ring 24 is opaque, it is difficult for an operator to see the guide ring 41 from the outside. In this embodiment, when the second pipe 100B is inserted into the gap S1 toward the tip side D1, the guide ring 41 is visually observed from the outside through the outer body member 22 and the inner body member 23. Details of the visual observation method will be described together with the operation method.

[0021] 2, the first pipe 100A is connected to the first connecting portion 12 of the joint 10. At this time, if a male thread 12a is formed on the first connecting portion 12, the first pipe 100A may be screwed onto the male thread 12a. Next, the cap 50 is removed from the fitting 10, for example, by pulling it out toward the proximal end side D2. Then, the second tube 100B is inserted into the gap S1 of the fitting 10. As a result, as shown in FIG. 2, the second tube 100B is inserted into the retaining member 31. The retaining portion 33 engages with the outer peripheral surface of the second tube 100B, preventing the second tube 100B from being pulled out. The end of the second tube 100B abuts against the guide ring 41. As the second tube 100B is inserted, the guide ring 41 is pushed toward the distal end side D1. At this time, even if the lock ring 24 is opaque, the guide ring 41 gradually enters the visible region R (specifically, the first region R1) from the region on the proximal end side D2 relative to the visible region R (the non-visible region).

[0022] Eventually, the guide surface 43a of the guide ring 41 comes into contact with the striking protrusion 23c, and the striking portion 23b is elastically deformed so as to be warped radially outward. As shown in FIG. 3, when the second pipe 100B is inserted to the correct connection position, the striking protrusion 23c overcomes the guide portion 43 and elastically returns radially inward. At this time, the striking protrusion 23c strikes the movable main body portion 42, generating a clicking sound. Hearing this sound confirms that the second pipe 100B has reached the correct connection position (correct connection state). At this time, excessive insertion of the second pipe 100B is prevented by, for example, the guide ring 41 contacting the step portion 15. At this time, the guide ring 41 (in the illustrated example, a portion of the guide ring 41) enters the second region R2 from the first region R1. Therefore, in the correct connection state, the guide ring 41 is visible. Therefore, for example, it is possible to reliably determine whether the second pipe 100B is in a properly connected state or an incompletely connected state based on the position at which the guide ring 41 is visible.

[0023] 3, a structure including the fitting 10 and the pipes 100A and 100B is referred to as a piping structure 60. The piping structure 60 includes the fitting 10 and the pipes 100A and 100B. In the piping structure 60, the guide ring 41 is disposed in the gap S1 on the tip side D1 of the second pipe 100B, and is visible from the outside through the outer body member 22 (visible region R).

[0024] As described above, in the fitting 10 of this embodiment, the large-diameter portion 22b of the outer body member 22 and the inner body member 23 are transparent. Therefore, for example, as shown in FIGS. 2 and 3 , when inserting the second pipe 100B into the gap S1 toward the distal end D1, the guide ring 41 can be visually observed from the outside through the outer body member 22 and the inner body member 23 (visible area R). This facilitates visual detection of installation defects during installation (before a water pressure test). For example, whether the second pipe 100B has been inserted the desired distance can be determined by visually observing the position of the guide ring 41 from the outside without requiring additional work, such as marking the second pipe 100B in advance. Furthermore, for example, the presence of foreign matter in the gap S1 or the detachment of the seal member 14 from the groove 13a (so-called ring disengagement) can be easily detected.

[0025] When the color of the inner body member 23 is the complementary color of the guide ring 41, the guide ring 41 is difficult to see from the outside through the outer body member 22 and the inner body member 23 when the guide ring 41 is positioned radially inward relative to the inner body member 23 (i.e., in the first region R1), as shown in Fig. 2. On the other hand, when the guide ring 41 moves further toward the tip end D1 of the inner body member 23 (i.e., in the second region R2), as shown in Fig. 3, the guide ring 41 can be seen from the outside only through the outer body member 22, without passing through the inner body member 23. Therefore, the guide ring 41 can be seen without being affected by the inner body member 23, making it easier to see. As described above, with this joint 10, the position of the guide ring 41 can be easily grasped depending on how easily (or how difficultly) the guide ring 41 is visible from the outside.

[0026] (Second embodiment) Next, a capped joint 1A and a piping structure 60A according to a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0027] In this capped joint 1A, a portion of the large diameter portion 22b located closer to the base end D2 than the end of the tip end D1 of the inner body member 23 has a lower transparency than a portion of the large diameter portion 22b located closer to the tip end D1 than the end of the tip end D1 of the inner body member 23. More specifically, the large diameter portion 22b of the outer body member 22 is provided with a semi-transparent portion 22c (frosted glass portion, semi-transparent portion). The semi-transparent portion 22c is provided only in a portion of the large diameter portion 22b located in the first region R1. In the illustrated example, the remaining portion of the large diameter portion 22b (for example, the portion located in the second region) is not the semi-transparent portion 22c. The transparency of the translucent portion 22c is lower than the transparency of the remaining portion of the large-diameter portion 22b. The translucent portion 22c makes it more difficult for an operator to see inside than the remaining portion of the large-diameter portion 22b. The translucent portion 22c (part of the large-diameter portion 22b) may be formed of a translucent material, for example, or may have a pattern on its surface (part of the large-diameter portion 22b) that partially obstructs visibility. An example of a pattern that partially obstructs visibility on the surface is a dotted pattern provided on the outer peripheral surface of the outer body member 22. Such a pattern can be provided by printing on the outer body member 22, for example. Examples of printing methods include inkjet printing. For example, the translucent portion 22c may be colored and transparent. In this case, the color of the translucent portion 22c may be a complementary color to the guide ring 41.

[0028] As described above, in the joint 10 of this embodiment, the portion of the large diameter portion 22b located on the base end side D2 relative to the end on the distal end side D1 of the inner body member 23 (in the illustrated example, the translucent portion 22c) has a lower transparency than the portion located on the distal end side D1 relative to the end on the distal end side D1 of the inner body member 23. Therefore, when the guide ring 41 is located radially inward relative to the inner body member 23, the guide ring 41 is located radially inward of the translucent portion 22c, which is a portion of the outer body member 22 that has a lower transparency, making it difficult to see the guide ring 41 from the outside through the outer body member 22 and the inner body member 23. On the other hand, as shown in FIG. 5 , when the guide ring 41 moves distally relative to the end on the distal end side D1 of the inner body member 23, the guide ring 41 can be seen from the outside only through the outer body member 22, not through the inner body member 23. Therefore, the guide ring 41 is located distally relative to the translucent portion 22c, making the guide ring 41 easy to see. As described above, with this joint 10, the position of the guide ring 41 can be easily grasped depending on how easily (or how difficultly) the guide ring 41 is visible from the outside.

[0029] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0030] For example, the cap 50 may be omitted. The shapes of the inner body member 23 and the guide ring 41 are not limited to those shown in the above embodiment. For example, the above-mentioned clicking sound does not have to be generated.

[0031] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate.

[0032] (Addendum) The embodiment can be understood, for example, as follows.

[0033] <1> A fitting according to one aspect of the present invention comprises: a fitting body; a body whose end on a first axial side is attached to the fitting body from the outside in the radial direction, with a gap provided between the outer surface of the fitting body and an inner circumferential surface of a portion located on a second axial side of the end; and a guide ring disposed in the gap so as to be movable toward the first side. The body comprises an outer body member having: a first portion attached to the fitting body from the outside in the radial direction and constituting the end; and a second portion extending from the first portion to the second side and having an inner diameter larger than the outer diameter of the fitting body; and an inner body member attached to the second portion from the inside in the radial direction and having an inner diameter larger than the outer diameter of the fitting body. The second portion of the outer body member and the inner body member are transparent.

[0034] The second portion of the outer body member and the inner body member are transparent. Therefore, for example, when inserting a pipe into a gap toward the first side, the guide ring can be seen from the outside through the outer body member and the inner body member. This makes it easy to visually detect installation defects during installation (before a water pressure test). For example, whether the pipe has been inserted the desired amount can be determined by visually checking the position of the guide ring from the outside without having to perform additional work such as marking the pipe in advance. Furthermore, for example, it becomes easier to detect foreign matter entering the gap.

[0035] <2> the above <1> In the joint according to the above, the first side end of the inner body member may be located closer to the second side than the first side end of the second portion, and the inner body member may be colored and transparent, and the color of the inner body member may be a complementary color to that of the guide ring.

[0036] The color of the inner body member is complementary to the color of the guide ring. Therefore, when the guide ring is positioned radially inward relative to the inner body member, it is difficult to see the guide ring from the outside through the outer body member and the inner body member. On the other hand, when the guide ring moves further toward the first side than the first end of the inner body member, the guide ring can be seen from the outside only through the outer body member, without passing through the inner body member. Therefore, the guide ring can be seen without being affected by the inner body member, making it easier to see. As described above, this joint makes it easier to grasp the position of the guide ring depending on how easily (or how difficultly) the guide ring can be seen from the outside.

[0037] <3> the above <1> or <2> In the joint according to the above aspect, the first-side end of the inner body member may be located closer to the second side than the first-side end of the second portion, and the portion of the second portion located closer to the second side than the first-side end of the inner body member may have a lower transparency than the portion of the inner body member located closer to the first side than the first-side end.

[0038] The second portion, a portion of which is located on the second side of the first-side end of the inner body member, has a lower transparency than the portion of which is located on the first side of the first-side end of the inner body member. Therefore, when the guide ring is located radially inward relative to the inner body member, the guide ring is located radially inward of the less transparent portion of the outer body member, making it difficult to see the guide ring from outside through both the outer body member and the inner body member. On the other hand, when the guide ring moves further toward the first side than the first-side end of the inner body member, the guide ring is visible from outside only through the outer body member, not through the inner body member. Therefore, the guide ring is located on the first side of the less transparent portion of the outer body member, making it easier to see the guide ring. As described above, this joint makes it easier to grasp the position of the guide ring depending on how easily (or how difficultly) the guide ring can be seen from the outside.

[0039] <4> the above <1> from <3> In the joint according to any one of the above aspects, a configuration may be adopted in which the joint further includes a seal member disposed in a groove provided on an outer peripheral surface of the joint body.

[0040] <5> the above <1> from <4> In any one of the embodiments of the joint, a configuration may be adopted in which the joint further includes a retaining member that prevents the pipe placed in the gap from slipping out toward the second side, and the body further includes a lock ring that holds the retaining member between the body and the outer body member or the inner body member.

[0041] <6> The piping structure according to one aspect of the present invention is <1> from <5> and a pipe disposed in the gap, wherein the guide ring is disposed on the first side of the pipe within the gap and is visible from the outside through the outer body member.

[0042] <7> In a piping construction method according to one aspect of the present invention, <1> from <5> A piping construction method for assembling a fitting according to any one of the above embodiments and a pipe, wherein when the pipe is inserted into the gap toward the first side, the guide ring is viewed from the outside through the outer body member and the inner body member. [Explanation of symbols]

[0043] 10 Joints 11 Joint body 13a Groove 14 Sealing material 21 Body 22 Outer body parts 22a Tip (first part) 22b Large diameter part (second part) 23 Inner body parts 24 Lock ring 31 Anti-slip member 41 Guide ring 60, 60A piping structure 100A, 100B pipe D1 Tip side (first side) D2 Proximal side (second side) S1 Gap

Claims

1. A joint body; a body having an end portion on a first axial side attached to the joint body from the outside in the radial direction, and a gap provided between an inner circumferential surface of a portion located on a second axial side relative to the end portion and an outer circumferential surface of the joint body; a guide ring disposed in the gap so as to be movable toward the first side; The body is an outer body member including a first portion attached to the joint body from the radially outer side and constituting the end portion, and a second portion extending from the first portion to the second side and having an inner diameter larger than the outer diameter of the joint body; an inner body member attached to the second portion from the radially inner side and having an inner diameter larger than the outer diameter of the joint body, The second portion of the outer body member and the inner body member are transparent.

2. an end of the inner body member on the first side is located on the second side of an end of the second portion on the first side; the inner body member is colored and transparent; 2. The fitting of claim 1, wherein the color of the inner body member is a complementary color to the guide ring.

3. an end of the inner body member on the first side is located on the second side of an end of the second portion on the first side; 2. The joint according to claim 1, wherein a portion of the second portion located on the second side of the first end of the inner body member has a lower transparency than a portion of the inner body member located on the first side of the first end.

4. 2. The fitting of claim 1, further comprising a seal member disposed in a groove provided on an outer peripheral surface of the fitting body.

5. a retaining member that prevents the pipe disposed in the gap from coming out toward the second side; The joint according to claim 1 , wherein the body further comprises a lock ring that holds the retaining member between the body and the outer body member or the inner body member.

6. A joint according to any one of claims 1 to 5; a pipe disposed in the gap, The guide ring is disposed in the gap on the first side of the pipe and is visible from the outside through the outer body member.

7. A piping construction method for assembling the joint according to any one of claims 1 to 5 and a pipe, The piping installation method includes visually confirming the guide ring from outside through the outer body member and the inner body member when the pipe is inserted into the gap toward the first side.

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