JP2014200805A - Piping groove mating structure and piping groove mating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping groove mating structure and a piping groove mating method capable of easily adjusting centering and spacing of a piping groove part by few field work manhours.SOLUTION: The piping groove mating structure adjusts the centering and the spacing of the groove parts 101c and 101d before butt welding of mutual pipes 101a and 101b suspended so as to be movable in the axial direction, and comprises a plurality of wire hooking parts 102a and 102b mutually arranged at an equal interval in the same number along the circumferential direction in the vicinity of the groove parts 101c and 101d of the two pipes 101a and 101b, and a wire 103 is alternately hooked on the wire hooking part 102a of the pipe 101a and the wire hooking part 102b of the pipe 101b, and both ends of the wire 103 are pulled, and thereby, a distance between the mutual groove parts 101c and 101d is set in a predetermined value required for welding.

Description

  The present invention relates to a pipe groove alignment structure and a pipe groove alignment method when welding pipes to each other.

  As piping work at the site of a large plant, in pipe groove alignment accompanying on-site welding work of the pipe connection part when connecting pipes, the pipe is lifted with a chain block and the chain block is operated. Centering of the groove part of the pipe (Make the axis center of one pipe coincide with the axis center of the other pipe) and adjust the distance between the faces (make the groove parts close to each other until the distance required for welding) ing.

  In the pipe groove alignment by the operation of such a chain block, it is a very difficult work that requires fine adjustment of not only the groove part but also the entire pipe position, and requires skill. .

  Patent Document 1 proposes an automatic pipe groove aligning apparatus having a sensor capable of measuring a gap and an inner diameter step of a groove portion of a pipe and a hydraulic control system for moving a chain block. In this device, the position of the pipe can be automatically adjusted by automatically controlling the chain block based on the measurement data of the sensor, thereby reducing the time and cost of the piping work.

JP-A-6-193780

  However, the apparatus described in Patent Document 1 requires a plurality of sensors, and it takes time to mount the plurality of sensors, which increases the number of man-hours required for field work.

  The present invention solves the above-described conventional problems, and a pipe groove alignment structure and a pipe groove alignment that can easily center and adjust the face of a pipe groove with a small number of field work steps. It is an object to provide a method.

The present invention relates to a pipe groove alignment structure that performs centering of a groove portion before butt welding between pipes that are supported so as to be movable in the axial direction, and adjustment between the faces. A plurality of bridges arranged at equal intervals in the circumferential direction in the vicinity of the section, and the wires are alternately bridged between the bridge part of the one pipe and the bridge part of the other pipe. The groove portions are abutted with each other by pulling the wire.
Further, a spring may be applied instead of the wire.

  ADVANTAGE OF THE INVENTION According to this invention, the piping groove alignment structure and piping groove alignment method which can perform centering of a piping groove part and surface adjustment easily with few field work man-hours can be provided.

It is a perspective view which shows the piping groove alignment structure which concerns on 1st Embodiment. It is a front view which shows arrangement | positioning of the wire linking part of piping. It is a disassembled perspective view which shows a wire-hanging part. It is an operation process figure at the time of performing piping groove alignment. It is a figure which shows the state of piping at the time of performing pipe groove alignment. (A) is an effect | action figure which shows the tensile force when a groove surface distance is long, (b) is an action figure which shows the tensile force when a groove surface distance is short. In the pipe groove alignment structure according to the second embodiment, (a) is an action diagram showing a tensile force when the distance between the groove faces is long, and (b) shows a tensile force when the distance between the groove faces is short. It is an action figure. The piping groove alignment structure which concerns on 3rd Embodiment is shown, (a) is a front view, (b) is a top view.

  Hereinafter, a pipe groove alignment structure and a pipe groove alignment method according to the present embodiment will be described with reference to the drawings. In addition, as a device for suspending a pipe, such as a churn block, a crane, etc., which can hang the pipe and can move the pipe in the axial direction when the pipe is pulled with a wire or a spring, For example, it may be a carriage that supports the pipe from below. Also, the pipes 101a and 101b used for pipe groove alignment shown in FIG. 1 are examples, and both need not be straight pipes. For example, one pipe may be a straight pipe and the other may be an L-shaped pipe. There is no particular limitation as long as the pipe groove alignment structure of the present invention can be applied.

(First embodiment)
FIG. 1 is a perspective view showing a pipe groove alignment structure according to the first embodiment, FIG. 2 is a front view showing a wire linking part of the pipe, and FIG. 3 is an exploded perspective view showing the wire linking part. For example, the piping has a large diameter used in large power plants such as nuclear power and thermal power, and is formed of carbon steel, low alloy steel, stainless steel, or the like.

  As shown in FIG. 1, the pipe groove alignment structure according to the first embodiment includes a plurality of wire framing parts (hanging parts) 102 a provided in the pipe 101 a and a plurality of wire linking parts provided in the pipe 101 b ( (Bridge part) 102b. Note that the end faces where the pipe 101a and the pipe 101b face each other are groove portions (groove surfaces) 101c and 101d. The two pipes 101a and 101b that perform pipe groove alignment have the same diameter.

  A plurality of wire-hanging portions 102a are arranged in the vicinity of the groove portion 101c of the pipe 101a along the circumferential direction. The wire-hanging portion 102a is formed of a metal material that is joined to the pipe 101a by welding or the like. Each wire linking portion 102a is formed at a distance X (only the pipe 101b side is shown) from the groove portion 101c.

  The wire linking part 102b is formed in the vicinity of the groove part 101d of the pipe 101b in the same number as the wire linking part 102a along the circumferential direction. The wire-hanging portion 102b is also formed of a metal material that is connected to the pipe 101b by welding or the like. Further, each wire linking portion 102b is formed at a position of a distance X from the groove portion 101d.

  It should be noted that the vicinity of the groove portions 101c and 101d (distance X) of the pipes 101a and 101b is preferably provided in a place that does not hinder the welding and inspection of the pipes 101a and 101b. The inspection refers to inspection of a welded part (such as an ultrasonic test).

  As shown in FIG. 2, the wire linking parts 102a and 102b are arranged at an angle of 45 degrees, for example, and are configured to be a total of eight. Accordingly, the distances S between the adjacent wire linking portions 102a and 102b are set to the same length.

  Thus, the wire linking part 102a provided in the pipe 101a and the wire linking part 102b provided in the pipe 101b are configured by the same number (eight in this embodiment). Further, the distance S between the wire linking parts 102a adjacent in the circumferential direction in the pipe 101a and the distance S between the wire linking parts 102b adjacent in the circumferential direction in the pipe 101b are set to be the same.

  In the present embodiment, the case where the number of the wire linking portions 102a and 102b is eight is described as an example. However, the number may be seven or less, may be nine or more, and may be plural. I just need it. Further, the wire linking portions 102a and 102b are not limited to an even number, and may be an odd number.

  As shown in FIG. 3, the wire-hanging portions 102 a and 102 b are composed of a shaft portion 121 and a rotating member 122.

  The shaft 121 includes a base 121a fixed to the outer surfaces of the pipes 101a and 101b by welding, a shaft 121b extending from the base 121a toward the radially outer side of the pipes 101a and 101b, and a rotating member 122 from the shaft 121b. And a retaining portion 121c that prevents the slipping out.

  The rotating member 122 has a substantially cylindrical shape, and is formed with an insertion hole 122a that is rotatably supported by the shaft portion 121b. Further, the outer peripheral surface 122b of the rotating member 122 is formed with a constricted portion 122c having a shape that decreases in diameter from the upper end (the tip end of the shaft portion 121b) and the lower end (the base end of the shaft portion 121b) toward the center in the axial direction. Yes. A wire 103 (see FIG. 1) is hung on the constricted portion 122c.

  In addition, the rotation member 122 should just be the structure supported rotatably with respect to the axial part 121b. For example, a mechanism may be provided in which a bearing or the like is provided between the rotating member 122 and the shaft portion 121b to smoothly rotate the rotating member 122 relative to the shaft portion 121b. Thereby, the frictional force between the wire hangers 102a and 102b and the wire 103 (see FIG. 1) can be further reduced.

  Returning to FIG. 1, before welding the pipes 101 a and 101 b, pipe groove alignment is performed in which the groove parts 101 c and 101 d of the pipes 101 a and 101 b are brought into contact with each other. That is, after the wires 103 are alternately laid on all the wire linking portions 102a of the piping 101a and all the wire linking portions 102b of the piping 101b, one end of the wire 103 is fixed, and the other end of the wire 103 is wound with the wire. Connect to device 104. Then, by winding the wire 103 with the wire winding device 104, the pipes 101a and 101b gradually approach, and the groove portions 101c and 101d of the pipes 101a and 101b are centered (the axis center of the pipe 101a and the axis of the pipe 101b). The center of the groove portions 101c and 101d is adjusted (closer until the distance (predetermined value) necessary for welding is reached).

  Note that the wire 103 to be used may be made of metal or resin as long as it can be hung on the wire hangers 102a and 102b, and can be appropriately selected.

  Next, a work procedure for groove alignment of the pipes 101a and 101b will be described in detail with reference to FIGS. FIG. 4 is a work process diagram when performing piping groove alignment, and FIG. 5 is a diagram showing a state of piping when performing piping groove alignment.

  First, as shown in step 1 of FIG. 4, the pipes 101a and 101b are suspended by a chain block (not shown) (see FIG. 1).

  Then, as shown in step 2 of FIG. 4, the wire 103 is hung on the wire hanger 102a. For example, as shown in FIG. 5A, the wire 103 is laid on the wire linking portion 102a (A1) of the pipe 101a. At this time, the wire 103 is hung on the wire hanger 102a so that the wire 103 after hung on the wire hanger 102a faces the pipe 101b.

  Then, as shown in step 3 of FIG. 4, the wire 103 is laid on the wire linking portion 102b. For example, as shown in FIG. 5B, the wire 103 is laid on the wire linking part 102b (B1) of the pipe 101b located in the vicinity of the wire linking part 102a (A1). Also at this time, the wire 103 is hung on the wire hanger 102b (B1) so that the wire 103 hung on the wire hanger 102b faces the pipe 101a side. Further, the wire 103 is hung so as not to be wound once around the wire hanger 102b (B1).

  The steps 2 and 3 are repeated, and the wires 103 are sequentially placed on all the wire linking portions 102a and 102b. That is, as shown in FIG. 5 (c), on the pipe 101a side, the wire 103 is laid on the wire linking part 102a (A2) adjacent to the wire linking part 102a (A1), and on the pipe 101b side, the wire linking part 102b ( B1), the wire 103 is laid on the adjacent wire linking part 102b (B2), and on the pipe 101a side, the wire 103 is laid on the wire linking part 102a (A3) adjacent to the wire linking part 102a (A2). The wires 103 are alternately laid on the wire linking portion 102a and the wire linking portion 102b so as to hang on the wire linking portion 102b (B3) adjacent to the wire linking portion 102b (B2), and the wires 103 The wires 103 are laid on all the wire linking portions 102a and 102b so as not to cross each other.

  Then, as shown in Step 4 of FIG. 4, both ends of the wire 103 are passed (connected) through the wire winding device 104. That is, as shown in FIG. 5D, both ends 103a and 103b of the wire 103 are passed (connected) through the wire winding device 104. As shown in FIG. 1, one end of the wire 103 may be fixed and the other end may be passed through the wire winding device 104.

  Then, as shown in Step 5 in FIG. 4, the wire winding device 104 is operated to wind the wire 103. As a result, as shown in FIG. 5 (e), when both ends 103a and 103b of the wire 103 are wound, a tensile force for pulling the wire 103 in the direction indicated by the arrow is generated. When winding the wire 103 with the wire winding device 104, it is preferable that both ends 103a and 103b (see FIG. 5D) of the wire 103 cross each other as shown in FIG. Further, both ends 103a and 103b of the wire 103 are set at positions where the wire 103 is not detached from the wire linking portions 102a and 102b when the wire 103 is wound.

  As shown in step 6 of FIG. 4, the groove portions 101c and 101d of the pipes 101a and 101b are parallel to each other, and the distance between the grooves 101c and 101d (the distance between the groove surfaces) is a predetermined value. Wind the wire 103 until: The predetermined value is a clearance necessary for welding, and is set to several mm, for example.

  That is, as shown in FIG. 5F and FIG. 5G, the distance between the pipe 101a and the pipe 101b is gradually reduced by winding the wire 103 with the wire winding device 104. At this time, the groove is formed on the side where the distance between the groove portion 101c of the pipe 101a and the groove portion 101d of the pipe 101b is long (the groove portions 101c and 101d on the upper side in FIG. 5 (f) and FIG. 5 (g)). The speed at which the portions 101c and 101d approach each other is fast, and the speed at which the groove portions 101c and 101d approach each other on the side where the distance between the groove portion 101c of the pipe 101a and the groove portion 101d of the pipe 101b is short (the lower side in the drawing). Become slow. Therefore, as the wire 103 is wound by the wire winding device 104, the distances between the groove portions 101c and 101d are made uniform.

  Finally, as shown in FIG. 5 (h), the groove portions 101c and 101d of the pipes 101a and 101b become parallel to each other. After the groove portions 101c and 101d become parallel to each other, the groove portions 101c and 101d approach each other while maintaining the parallelism, and as shown in FIG. 5 (i), between the surfaces of the groove portions 101c and 101d The distance is a predetermined value CL.

  Note that the distance at which the pipe 101a and the pipe 101b are first separated when the pipes are aligned is such that the groove 101c and the groove 101d are inclined (the axes of the pipes 101a and 101b do not match). In the state), it is preferable to secure a length in which the distance between the groove portion 101c and the groove portion 101d does not reach a predetermined value.

  Next, the principle that the groove portions 101c and 101d are parallel will be described with reference to FIG. FIG. 6A is an operation diagram showing the tensile force when the groove surface distance is long, and FIG. 6B is an operation diagram showing the tensile force when the groove surface distance is short.

  As shown in FIG. 6A, when the groove portion 101c of the pipe 101a and the groove portion 101d of the pipe 101b are greatly separated, that is, when the distance between the groove surfaces is long, the wire-hanging portion 102a. The horizontal component of the tensile force T1 acting on the wire linking part 102a between the wire linking part 102b and the wire linking part 102b is T2. The horizontal component force T2 is an axial component of the pipes 101a and 101b and is a force that attracts the pipes 101a and 101b. In contrast, as shown in FIG. 6B, when the groove portion 101c of the pipe 101a and the groove portion 101d of the pipe 101b are close to each other, that is, when the distance between the groove surfaces is short, The horizontal component of the tensile force T3 acting on the wire linking part 102a between the wire linking part 102a and the wire linking part 102b is T4. Thus, as the distance between the groove faces becomes shorter, the force that attracts the pipes 101a and 101b becomes smaller (weaker).

  Therefore, as shown in FIGS. 5 (e) to 5 (h), the groove portions 101c and 101d having a long distance between the groove surfaces are larger than the groove portions 101c and 101d having a short distance between the groove surfaces. Since the force to bring the groove portions 101c and 101d closer to each other becomes stronger, the speed at which the groove portions 101c and 101d having a longer distance between the groove surfaces approach each other becomes faster, and the groove portions 101c and 101d having a shorter distance between the groove surfaces become closer to each other. Since the speed at which the groove approaches becomes slower, the groove portions 101c and 101d gradually approach each other in parallel.

  In FIG. 6A, the axial centers of the pipes 101a and 101b coincide with each other, and the tensile force T1 between the wire linking portion 102a and one (the upper side in the drawing) wire linking portion 102b and the horizontal component force T2 thereof. And the angle formed by the tensile force T1 between the wire linking portion 102a and the other (the lower side in the drawing) wire linking portion 102b and the horizontal component force T2 thereof is given as an example. However, when the axes of the pipes 101a and 101b do not coincide with each other, and the pipe 101b is inclined downward with respect to the horizontal pipe 101a, for example (FIGS. 5E and 5F). , (G)), the upper angle θ1 is smaller than the lower angle θ1, and the upper horizontal component force is larger than the lower horizontal component force, so that the upper side is pulled stronger than the lower side. To be parallel.

  After the groove portions 101c and 101d are close to a predetermined value or less, the pipes 101a and 101b are temporarily fixed using a predetermined jig while maintaining the predetermined value (clearance) CL, and the wire 103 is detached. After welding.

  As described above, according to the pipe groove alignment structure according to the first embodiment, the same number of the pipes 101a and 101b are provided at equal intervals in the vicinity of the groove portions 101c and 101d in the circumferential direction. A plurality of wire-hanging portions 102a and 102b arranged on the wire 101, the wire 103 is alternately hung on the wire-hanging portion 102a of the pipe 101a and the wire-hanging portion 102b of the pipe 101b, the wire 103 is pulled, and the groove portions 101c and 101d By matching each other, the pipes 101a and 101b can be easily centered and the distance between the faces can be adjusted with a small number of field work steps. Further, according to the first embodiment, work requiring skilled techniques is not necessary.

  In addition, according to the first embodiment, the wire linking portions 102a and 102b include the shaft portion 121b orthogonal to the axial direction S1 (see FIG. 1) and the rotating member 122 rotatably supported by the shaft portion 121b. By providing (refer to FIG. 3), when the wire 103 is hung on the wire hangers 102a and 102b and the wire 103 is wound by the wire winding device 104, the resistance due to friction between the wire 103 and the wire hangers 102a and 102b Therefore, the force for winding the wire 103 can be reduced. As a result, it is possible to prevent the wire winding device 104 from becoming large.

  In addition, according to the first embodiment, the outer peripheral surface 122b of the rotating member 122 has the constricted portion 122c whose diameter decreases from both ends of the shaft portion 121b toward the center (see FIG. 3). It can be held stably.

(Second Embodiment)
7A and 7B show a pipe groove alignment structure according to the second embodiment, wherein FIG. 7A is an operation diagram showing a tensile force when the distance between the groove surfaces is long, and FIG. 7B is a case when the distance between the groove surfaces is short. It is an effect | action figure which shows tensile force. Note that the pipe groove alignment structure according to the second embodiment is one in which a spring 201 is applied instead of the wire 103 of the first embodiment. Moreover, in 2nd Embodiment, it replaces with the wire linking part 102a, 102b of 1st Embodiment, and applies the spring suspending part 112a, 112b. About another structure, it shall be comprised similarly to 1st Embodiment.

  As shown in FIG. 7, the pipe groove alignment structure according to the second embodiment includes a plurality of spring bridges (bridges) 112 a provided on the pipe 101 a and a plurality of spring bridges provided on the pipe 101 b ( (Bridge part) 112b. About the structure of the spring hanging part 112a, 112b, it is the structure which remove | excluded the rotation mechanism from the wire hanging part 102a, 102b of FIG. 3, for example, is comprised by the column-shaped (bar-shaped) member.

  The spring 201 is constituted by, for example, a coil spring, and one end is hung on the spring hanging portion 112a and the other end is hung on the spring hanging portion 112b. In addition, it is not limited to the structure which mounts the one spring 201 between the spring mounting part 112a and the spring mounting part 112b, It comprises with a continuous spring, and each spring mounting part 112a, 112b alternately It may be constructed.

  The spring force (spring coefficient) of the spring 201 is set so that the distance between the groove portions 101c and 101d becomes a predetermined value CL (see FIG. 5) when the spring 201 is most contracted.

  As shown in FIG. 7A, when the groove portion 101c of the pipe 101a and the groove portion 101d of the pipe 101b are greatly separated, that is, when the distance between the groove surfaces is long, the spring hanging portion 112a. The horizontal component force of the tensile force T5 acting on the spring 201 between the spring mounting portion 112b and the spring mounting portion 112b is T6. In contrast, as shown in FIG. 7B, when the groove portion 101c of the pipe 101a and the groove portion 101d of the pipe 101b are close to each other, that is, when the distance between the groove surfaces is short, The horizontal component force of the tensile force T7 acting on the spring 201 between the spring hanging portion 112a and the spring hanging portion 112b is T8. Thus, as the distance between the groove faces becomes shorter, the force that attracts the pipes 101a and 101b becomes smaller (weaker).

  Therefore, even when the spring 201 is applied instead of the wire 103, as described with reference to FIGS. 5E to 5H, the groove portions 101c on the side where the distance between the groove surfaces is long, Since the speed at which 101d approaches each other increases (the tensile force increases), and the speed at which the groove portions 101c and 101d on the side where the distance between the groove faces becomes shorter decreases (the tensile force decreases), the groove portion 101c and 101d gradually approach parallel.

  As described above, according to the pipe groove alignment structure according to the second embodiment, the same number of the pipes 101a and 101b are arranged at equal intervals in the vicinity of the groove parts 101c and 101d in the circumferential direction. A plurality of spring mounting portions 102a, 102b, and the springs 201 are alternately hooked on the spring mounting portions 112a of the piping 101a and the spring mounting portions 112b of the piping 101b, respectively, so that the groove portions 101c, 101d are brought into contact with each other. Therefore, the pipes 101a and 101b can be easily centered and the inter-surface adjustment can be easily performed with a small number of field work steps. Further, according to the second embodiment, work requiring skilled skills is not necessary.

  Further, according to the second embodiment, the wire 103, the wire take-up device 104 and the like are not necessary, and equipment necessary for pipe groove alignment can be simplified.

(Third embodiment)
FIG. 8 shows a pipe groove alignment structure according to the third embodiment, wherein (a) is a front view and (b) is a top view. In the third embodiment, instead of the configuration in which the wire hangers 102a and 102b are provided directly on the pipes 101a and 101b, the wire hangers 102a and 102b that can be attached to and detached from the pipes 101a and 101b are used.

  As shown to Fig.8 (a), the pipe groove alignment structure which concerns on 3rd Embodiment is comprised from cover part 301a, 301b and antiskid sheet | seat (slip prevention part) ST.

  The cover portion 301a has a substantially semicircular shape when viewed from the front in FIG. 8A, and is formed along the outer peripheral surfaces of the pipes 101a and 101b. In addition, on the outer peripheral surface 301c of the cover portion 301a, wire linking portions 102a and 102b are arranged at equal intervals along the circumferential direction.

  The cover portion 301b has a substantially semicircular shape when viewed from the front in FIG. 8A, and is formed along the outer peripheral surfaces of the pipes 101a and 101b. In addition, on the outer peripheral surface 301d of the cover portion 301b, wire-hanging portions 102a and 102b are arranged at equal intervals along the circumferential direction.

  In FIG. 8A, illustration of wire linking portions 102a and 102b where bolts B and nuts N, which will be described later, are omitted (the same applies to FIG. 8B). In addition, it is preferable to adjust the positions of the wire linking portions 102a and 102b so that the wire linking portions 102a and 102b are not located at the connecting portion (the bolt B and the nut N portion) between the cover portion 301a and the cover portion 301b. .

  As shown in FIG. 8 (b), the cover portion 301a is formed with flange portions 301e and 301e projecting on both sides at positions offset from the positions of the wire linking portions 102a and 102b. Also, the cover portion 301b is formed with flange portions 301f and 301f at positions corresponding to the flange portions 301e and 301e in the same manner as the cover portion 301a (see FIG. 8A).

  The non-slip sheet ST is formed of an elastic material having a large frictional resistance such as rubber (a material having a resistance that the positions of the cover portions 301a and 301b are not shifted when a tensile force is generated by the wire 103), and the pipes 101a and 101b. It is interposed between the cover portions 301a and 301b. In the state where the non-slip sheet ST is laminated between the pipes 101a and 101b and the cover portions 301a and 301b, the one flange portion 301e and the flange portion 301f and the other flange portion 301e and the flange portion 301f are respectively connected to the bolt B. And tighten through the nut N. Thereby, even if the wire 103 is hung on the wire hangers 102a and 102b and the wire 103 is wound up by the wire winding device 104, the cover portions 301a and 301b can be prevented from coming out of the pipes 101a and 101b.

  According to the third embodiment, there is no need to fix the wire hangers 102a and 102b to the pipes 101a and 101b by welding or the like, and there is no need to use a dedicated pipe to which the wire hangers 102 and 102b are fixed.

  The mechanism for making the wire hangers 102a and 102b detachable from the pipes 101a and 101b is not limited to the third embodiment, and the wire hangers 102a and 102b are fixed via an electromagnet or the like. A cover portion may be applied.

101a, 101b Piping 101c, 101d Groove 102a, 102b Wire linking (hanging)
103 Wire 104 Wire take-up device 112a, 112b Spring bridge (bridge)
121b Shaft portion 122 Rotating member 122b Outer peripheral surface 122c Constricted portion 201 Spring 301a, 301b Cover portion ST Non-slip sheet (anti-slip portion)

Claims (6)

A pipe groove alignment structure that performs centering of the groove and adjusting the surface before butt welding between pipes supported so as to be movable in the axial direction,
In the vicinity of the groove portion of the two pipes, provided with a plurality of bridge portions arranged at equal intervals in the same number along the circumferential direction,
A pipe groove alignment structure characterized in that the groove portions are butted against each other by pulling the wires by alternately laying wires on a bridge portion of one of the pipes and a bridge portion of the other of the pipes. The bridge is
A shaft portion orthogonal to the axial direction of the pipe;
The piping groove alignment structure according to claim 1, further comprising: a rotating member that is rotatably supported by the shaft portion.   The pipe groove alignment structure according to claim 2, wherein a constricted portion whose diameter decreases from both ends of the shaft portion toward the center is formed on the outer peripheral surface of the rotating member. A pipe groove alignment structure that performs centering of the groove and adjusting the surface before butt welding between pipes supported so as to be movable in the axial direction,
In the vicinity of the groove portion of the two pipes, provided with a plurality of bridge portions arranged at equal intervals in the same number along the circumferential direction,
A piping groove alignment structure characterized in that springs are alternately laid on one of the piping sections of the piping and the other of the piping sections, and the groove sections are abutted against each other by the tensile force of the springs. A cover part that is detachably disposed around the pipe and to which the bridge part is fixed;
A non-slip portion disposed between the pipe and the cover portion;
The pipe groove alignment structure according to any one of claims 1 to 4, further comprising: A pipe groove alignment method for centering the groove and adjusting the gap before butt welding between the suspended pipes,
In the vicinity of the groove portion of each of the pipes, wires are alternately provided to a plurality of bridge portions arranged at equal intervals in the circumferential direction between one of the pipe bridge portions and the other of the pipe bridge portions. The groove portion is centered and the inter-surface adjustment is performed using a force that decreases the tensile force between the pipes as the distance between the groove portions when the wire is pulled is shortened. Piping groove alignment method.

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