JP2009291836A - Outside clamp type welded pipe groove aligning apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, in welding/joining two heavy pieces of piping on site, it is difficult to secure sufficient accuracy in groove aligning operation including centering and gap adjustment in the axial direction of the two pipes to take a lot of time in the groove aligning operation, resulting in a scourge of field operation. <P>SOLUTION: Two sets of frames freely opened/closed in a chevron shape are clamped mechanically by a clamp device relative to two pipes to be welded and are made adjustable in the relative position in the radial direction of the two pipes by a centering device installed in the outer periphery of the frames. Also, using an axial position adjusting screw provided in the frames, a gap and a contact force in the axial direction of the pipes at the grooves are adjusted so as to be uniform in the entire circumference, so that accurate groove alignment is performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a comparatively thick-walled pipe with medium and large diameters. When performing pipe groove alignment at the site where on-site pipe welding is performed, the pipe is clamped to adjust the centering and axial position. Thus, the present invention relates to an apparatus for performing groove alignment.

When welding two pipes, it is necessary to align the grooves, but when the pipes are relatively large and heavy, a U-shaped generally called horse as shown in FIGS. The member is first welded to the pipe 101 and then temporarily welded to the pipe 102 while centering the pipe. After that, only one layer is manually welded to the weld joint, after which the horse 103 is removed, an automatic welder is attached, and the automatic welder is used to deposit the weld. With such a method, accurate centering work is difficult and time-consuming, and before depositing with an automatic welder, horses may be removed and surface inspection may be required. There was a concern that smooth repair work would be required, which would take time and at the same time deteriorate quality.

Detailed Description of the Invention

Problems to be solved by the invention

Eliminate quality degradation and repair work, and reduce complex labor such as surface inspection.

Next, groove alignment that performs centering and axial position adjustment has a great influence on the subsequent welding work, and if the adjustment accuracy is poor, it is necessary to cover this by the skill of the welding operator. Must be based on skill. Therefore, in the present invention, a groove aligning device such as centering and axial position adjustment can be easily and accurately performed on site.

Means to solve the problem

In order to easily attach a clamping device to the pair of pipes to be joined on the site, based on the outer surface, one set of two splits, that is, a semicircular frame, and one of the joints is a pin joint type A ring-shaped frame is formed by a simple fastening that can be fastened with a hinge and the other bolt.

A device clamping device for clamping the frame by pressing the frame against the outer surface of the pipe with a strong force is provided. The clamping device is composed of a pad and a fastening member having two types of functions for positioning and fastening. Taking the most popular 4-pad system as an example, the upper two pads are used for positioning, and the pad is provided with a screw-type fastening material, so that the center of the pipe approximately matches the center of the frame in advance. Adjust so that it does. Then, the lower two pads are provided with a fastening material using a hydraulic cylinder, and after the frame is installed at a predetermined position of the pipe, high pressure hydraulic pressure is supplied to the hydraulic cylinder and fastened. The force of the hydraulic cylinder becomes the clamping force of the clamping device, which is 20 to 30 KN, 50 to 100 KN for a large diameter pipe, and clamps the frame with a strong force against the pipe. The other frame is clamped to the other pipe in the same manner.

Next, a plurality of centering devices are provided on the outer peripheral side of one frame and the other frame, and the centering device includes a beam integrally attached to one of the frames and a core attached to the other frame. It is composed of a payout for delivery and an adjusting screw for adjusting the relative distance between them. In general, the centering apparatus has four sets as one set. However, if there are three or more sets, the object can be achieved. The adjustment screw is tightened or loosened so that the outer diameter of the frame groove part of the other pipe and the outer diameter of the groove part of one pipe are adjusted to be concentric.

To adjust the relative position of the two pipes in the axial direction, an axial adjustment bolt is attached to another frame, the tip of the bolt is rotatably fitted in one frame, and the bolt is tightened to fix the axial position. Can be adjusted. After the centering adjustment of the two pipes is completed, the axial position adjustment bolts are used to make adjustment so that the groove portion of the pipe is uniformly contacted and given a pressing force over the entire circumference.

As described above, one set of the two-frame frame 2 is attached to the pipe to be welded and mechanically clamped. And it adjusts so that the outer diameter of the welding groove part of piping may become uniform over a perimeter with a centering adjustment apparatus. Then, using the adjustment bolt of the axial position adjustment device, the axial position or contact force of the groove portion is strongly tightened so as not to lose the heat distortion of the groove portion. This allows the pipes to be welded together.

The invention's effect

In the welded pipe groove aligning device of the present invention, the temporary attachment like the horse of the conventional method is not performed, and the clamping device performs the mechanical fastening, so the work such as removing the horse and repairing the trace is performed. Is no longer necessary. Especially in the case of important pipes, there is a concern that the quality of the pipes is deteriorated, especially where the heat history is received, and complicated inspection work such as surface inspection may be required. By using the apparatus of the present application, such work is unnecessary, and it can contribute to quality improvement and reliability improvement as well as man-hour reduction.

Clamping with a relatively large force, using a centering device to bring out the concentricity of the piping groove, and using a shaft position adjustment device, it is possible to precisely align the groove with a uniform pressing force. Therefore, the welding work to be continued can be performed easily and reliably. For this reason, the welding of the first layer was conventionally performed by highly skilled welding technicians, but reliable welding is possible even if it is not a special functional person.

Further, the groove aligning device has no large consumable parts and can be used any number of times for a series of operations. And it can be applied to pipes with different outer diameters by manufacturing according to the outer diameter of the other pipe, such as the length of the fastening screw of the clamp device and the curvature of the contact surface of the pad. One groove aligning device can be utilized to win efficiently.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, specific embodiments according to an outer surface clamp type welded pipe groove aligning device will be described in detail with reference to the drawings.

FIG. 3 is a structural diagram of the outer surface clamp type welded pipe groove aligning device according to the embodiment. 5 and 6 show the BB cross section and CC cross section of FIG. FIG. 3 shows a cross section taken along the line AA in FIG. In FIG. 3, 01 is a welded pipe, and a frame 03 and a frame 04 are fitted thereto. The upper parts of the frames 03 and 04 are connected by hinges in FIG. The hinge is depicted in detail in FIG. 4, but the frame 03 male hinge member 16 and the frame 04 are provided with a female hinge member 17, and the hinge pin 18 is provided at the rotating part of both, and the frame 03 and the frame 04 are The hinge pin 18 is opened and closed. A flange 11 is provided below the frame 03 and the frame 04 in FIG. 3 and is fastened by a bolt 12. When the bolt 12 is removed, the frame 03 and the frame 04 can be opened in a C shape around the hinge pin 18. Although it is shaded in the frame 03, the frame 04, and FIG. 3, the pin hole used as the suspension fulcrum of the wire 15 is provided near the action line of the center of gravity in the horizontal direction in FIG. The attachment bolt 13 as shown in FIG. 7 and the suspension piece 14 are attached to this. The boss | hub which has the screw provided in the frame 03 and the frame 04 is provided, and the pad position adjustment volt | bolt 08 which fitted the pad 07 rotatably to the front-end | tip is screwed in here. By turning the head of the position adjusting bolt 08, the position corresponding to the radius of the pad 07 can be changed within a limited range.

The frame 03 and the frame 05 are provided with a stopper 25 when the frame 03, the frame 04, the frame 05, and the frame 06 are opened and fitted into the pipe 01 and the pipe 02.

In FIG. 3, pads 07 are provided below the frames 03 and 04 (not shown, but the frames 05 and 06 are the same), and these are fitted to the hydraulic cylinder 09. A screw is cut on the outer periphery of the hydraulic cylinder 09 and is screwed into a boss having a screw so as to be welded to the frame 03 and the frame 04 and fixed with a nut. The screw on the outer peripheral portion of the hydraulic cylinder is used when changing the position in the radial direction with respect to the frame 03 and the frame 04 when handling the pipes 01 and 02 having different outer diameters. Although not shown, these hydraulic cylinders 09 are connected to a hydraulic pump, and high pressure hydraulic pressure is supplied via the hose 10.

Frame 03, Frame 04 A beam 19 of a centering device as shown in FIG. 10 is provided integrally. In the embodiment shown in FIG. 3, there are four places on the entire circumference, but three or five or more can be used. Further, the frame 05 and the frame 06 are provided with a receiving metal 20 at a position opposite to the beam 19. Since the adjusting screw 21 is screwed into the screw provided on the beam of the centering device, the tip is attached to the receiving metal 20 so as to be rotatable and constrain the radial position. By rotating and adjusting the adjusting screw 21 in this way, the relative radial position of the frame 05 and the frame 06 can be changed with respect to the frame 03 and the frame 04.

In FIG. 3, two axial position adjusting bolts 24 are provided on the horizontal center line. FIG. 11 shows cross-sectional views G and G thereof. As shown in the figure, the frame 03 and the frame 04 are tightened in the axial direction of the frame 05 and the frame 06. As a result, the position in the axial direction is adjusted and a constant contact force is applied to the weld groove. is there.

Action

As a preparation, the outer diameters of the pipe 01 and the pipe 02 are measured, and the adjustment screw 08 is adjusted so that the center of the pipe 01 and the pipe 02 matches the center of the welded pipe groove aligning device as accurately as possible. . The hydraulic pressure of the hydraulic cylinder 09 is released and the cylinder is retracted. Also, the adjusting screw and the axial position adjusting screw of the centering device should be sufficiently loosened to have a degree of freedom.

Two pipes to be welded are suspended on a table or a crane, and both are brought close to a joined state. The welded pipe groove aligning device is suspended and moved by a crane in a state where the welded pipe groove aligning device is opened in a letter C, and the frame 03, the frame 04, the frame 05, and the frame 06 are fitted. When the stopper 25 hits, the wire 15 is loosened and lowered until the flange 11 hits. In the middle of lowering, the upper pad 07 hits the pipe 01 and the pipe 02, and the stopper 24 is lifted and a clearance is generated. In this state, the bolt 12 of the flange 11 is tightened. Since this bolt 12 receives the reaction force of the force acting on the hydraulic cylinder 09, it is fastened sufficiently.

Next, the hydraulic pressure is supplied to the hydraulic cylinders 09 of the frame 03 and the frame 04, and the pipe 01 is securely restrained. Then, with the piping 02 as close as possible to the piping 01, the hydraulic pressure is also supplied to the hydraulic cylinder 19 on the frame 05 and frame 06 side, and the frame 05 and the frame 06 are restrained to the piping 02.

In this state, the adjusting screw 21 of the centering device is tightened, and the outer diameter portion of the welding groove is tightened and adjusted so that the pipe 01 and the pipe 02 are concentric.

Next, the axial position adjusting bolt 24 is tightened so that the contact in the axial direction of the weld groove is uniform over the entire circumference. When tightening with sufficient torque, the welding preparation work is completed.

In this state, the weld joint is welded by manual welding. Normally, when welding is further performed over the entire circumference, the welded pipe groove aligning device is removed in the completely reverse procedure of the groove aligning, and then an automatic welding device is attached, and a necessary amount of depositing is performed.

Illustration of the conventional method ZZ cross section in FIG. Sectional view of the welded pipe groove aligning device of the present application Illustration of the visual destination “X” in FIG. B / B cross-sectional view of FIG. CC cross section of FIG. DD cross section of FIG. EE cross section of FIG. View “Y” in FIG. 3 F / F cross-sectional view of FIG. GG cross section of FIG.

Explanation of symbols

1 and 2,
101 One pipe to be welded 102 The other pipe to be welded 103 Uma In FIGS. 3 and 11, 01 One pipe to be welded 02 The other pipe to be welded 03, 04 Frame (attached to pipe 01)
05,06 frame (attached to piping 02)
07 Pad 08 Pad position adjusting screw 09 Hydraulic cylinder 10 Hydraulic hose 11 Flange 12 Flange fastening bolt 14 Hanging bead 14 mounting bolt 15 Hanging wire (only center line is shown)
16, 17 Hinge 18 Hinge pin 19 Beam of the centering device 20 Base plate of the centering device 21 Adjustment screw of the centering device 22 Base plate of the axial position adjusting bolt 23 23 Axial position adjusting female screw 24 Axial position adjusting bolt 25 Stopper

Claims (1)

  There are two sets of ring-shaped frames, each frame is divided into at least two in the circumferential direction, one of which has a pin-type hinge that opens and closes with this as a fulcrum The other joint can be fastened into a ring-like structure, and a plurality of pads and screws for adjusting the positions of the pads and piping to be welded to the pads with a tightening force can be attached to the frame. An actuator device that clamps the frame is provided, and at least three sets of centering devices are provided on the outer periphery of the frame, one beam of the centering device is attached to one frame, and a receiver of the centering device is attached. Provided on the outer periphery of the other frame, the beam is provided with a relative position adjusting screw, which allows the relative position between the base and the base to be adjusted, and one frame and the other Relative axial device outer surface clamping welded piping GMA aligning apparatus characterized by upcoming provided with at least two adjustment bolts can be adjusted in the frame.

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