JPH0614945Y2 - Outer clamp device for piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an outer clamp device used for centering work during butt welding in piping work.

[Conventional technology]

In addition to straight pipes, many types of deformed pipes such as elbow pipes, T-shaped pipes, and reducer pipes are used for pipes used for plumbing work. In addition, many so-called cut tubes in which the groove line of the straight tube is not perpendicular to the tube axis are also used.

In these welded joints, joints of combinations of the above pipe types such as straight pipe and straight pipe, straight pipe and deformed pipe, cut pipe and deformed pipe are formed.

As an outer clamp as a centering jig for many of these welded joints, it is necessary to prepare several types of outer clamps that match the respective pipe types such as straight pipe and straight pipe, straight pipe and deformed pipe. is there. In addition, there is no outer clamp that can be used in welded joints for cutting pipes such as cutting pipes and elbow pipes, and cutting pipes and T-shaped pipes. It is general that a predetermined accuracy is secured by using such as.

On the other hand, the flexible restraint jig for conduits disclosed in Japanese Utility Model Publication No. 57-9040 has an upper frame and a lower frame that can be opened and closed by a hinge, and a two-way clamp device having a guide plate on the lower frame. A mechanism is disclosed in which the joint hinge is horizontally rotated to adjust the clamp angle between two threads.

Further, the welding jig disclosed in Japanese Utility Model Laid-Open No. 59-54192 discloses a welding holder for holding a groove alignment portion when welding pipes and pipes, pipes and pipe joints and the like. .

[Problems to be solved by the invention]

Gold arrows and horses (strongback jigs) that have been used in the past are used without fail when outer clamps cannot be used, such as straight pipes and deformed pipes, cut pipes and deformed pipes. To weld a horse in the vicinity,
There was a problem in terms of quality and efficiency because it required a change in the material of the base material, mounting welding of the horse, and bead polishing / repair after removal.

Further, the flexible restraint jig for a conduit described in Japanese Utility Model Publication No. 57-9040 has a problem that the work is extremely difficult when the bending direction of the bending pipe is other than horizontal.

Further, the welding jig described in Japanese Utility Model Laid-Open No. 59-54192 has a problem that it is difficult to hold and fix the route interval at a predetermined dimension because there is no mechanism for adjusting the route interval. This is because, even in the case of straight pipes as well as curved pipes or deformed pipes, although the tip of the bolt for tightening and fixing the pipe body has a conical shape, its contact can be moved by turning the bolt. Then the route interval changes. or,
Clamp welding also causes shrinkage of the root spacing, which reduces welding quality.

As described above, since there has not been an outer clamp that can be used for all welded joints, it was difficult to rationalize piping work.

The present invention has been made in order to solve such a problem, and an outer clamp for piping capable of easily and efficiently holding and fixing a proper groove shape, that is, a misalignment and a route interval to a predetermined dimension in piping work. The purpose is to obtain a device.

[Means for solving problems]

An outer clamp device for piping according to the present invention is slidable in a frame main body mounted on one of a pair of pipes abutting each other and a plurality of slide holes penetrating the frame main body in the axial direction of the pipe. In an outer clamp device for piping having an inserted slide bar and a free bolt that is supported by the tip of each slide bar and presses and holds the pipe end of the other pipe from the surroundings, A spacer bolt for groove adjustment that abuts the groove surface and presses the tube end of the other tube in the diametrical direction, and a spacer bolt inserted into the same slide hole so as to be slidably movable with respect to the slide bar. A supporting slide bar, and each of the slide bars is provided with a stopper for preventing the slide bar from falling off from the frame body.

[Operation] In this invention, after the frame body is attached to one of the pipe ends, the slide bar provided with the stopper for pulling out can be freely pulled out, and the position of the pipe end can be quickly adjusted by the universal bolt and the spacer bolt. Is. Also,
At this time, the spacer bolt does not merely set the groove interval between the pair of pipe members, but also has a function of receiving the pressing force of the universal bolt located on the opposite side. is there.

That is, the universal bolt is supported by a slide bar extended from the frame main body firmly fixed to one tube body to the other tube body side, and presses and holds the tube end of the other tube body from the surroundings. At this time, the pressing force of the universal bolt on the opposite side is received in cooperation with the groove adjusting spacer bolt that shares the slide hole.

For example, in the case of groove alignment of a cut pipe which is not perpendicular to the pipe axis shown in FIG. 4, the universal bolt 10 does not have the pressing force directions on the lowermost circumference and the uppermost circumference on the same straight line. It's different.

This difference in the direction of the pressing force serves as a force for rotating the pipe member 16 with the contact point between the universal bolt 10 located at the lowermost portion of the pipe circumference and the wall surface of the pipe member 16 as a fulcrum.

In this case, since the spacer bolt 11 located at the uppermost portion of the pipe circumference is in contact with the groove surfaces of both the pipe materials 15 and 16, a good opening is achieved even in the case of the groove alignment of a cut pipe that is not at right angles to the pipe axis. It is possible to make an appointment.

〔Example〕

FIG. 1 is a front view showing an embodiment of the present invention, in which 1 is a frame body, 2 is a frame piece forming the frame body, and the frame piece 2 is a ring-shaped member equally divided in the radial direction. Is formed. 3 is a frame piece 2
Of the inner wall surface of the tube, the tube contact surface formed concentric with the inner wall,
4 is a connecting pin that connects the frame pieces 2 so that they can be opened and closed.
Is a metal fitting attached to the opening of the frame piece 2, 6 is a support pin for the metal fitting 5, and 7 is a bolt for opening and closing the metal fitting 5.

Reference numeral 8 is a slide hole provided in the side wall of the frame body 1, 9 is a slide bar slidably attached to the slide hole 8, and 10 is a universal bolt attached to the tip of the slide bar 9.

2 and 3 show details of the slide bar 9 part,
2 is a front view, and FIG. 3 is a sectional view taken along the line AA of FIG.

Reference numeral 11 denotes a spacer bolt having a pyramidal spacer terminal 12 at its tip, and the spacer bolt 11 is attached to the tip of a spacer bolt slide bar 13 slidably attached to the center of the slide bar 9. Reference numeral 14 is a stopper for preventing the slide bar 9 from coming off.

The operation of the pipe outer clamp device configured as described above will be described with reference to FIG.

FIG. 4 is a side view showing a state in which the elbow pipe 16 is butt-welded to the cut pipe 15.

First, the frame body 1 is fixed to the cutting pipe 15 so that the spacer bolt 11 can slide on the groove portion of the cutting pipe 15. At the time of this fixing, the bolt 7 of the engaging fitting 5 is tightened and fixed so that the tube contact surface 3 is almost uniformly pressed against the surface of the cut tube 15.

Next, after sliding the slide bar 9 to a position sufficient to hold and fix the elbow pipe 16, the groove portion of the elbow pipe 16 contacts the groove portion of the cutting pipe 15 almost uniformly. While pressing it, rotate each adjustable bolt 10,
Hold the elbow pipe 16 while adjusting it by mistake. After that, the slide bar 13 for each spacer bolt is slid to align each spacer bolt 11 with the groove line 17, and the root interval is widened to a predetermined dimension while rotating each spacer bolt 11. In this case, the plurality of spacer bolts 11 may be operated symmetrically.

After securing the proper groove conditions as described above, the inside of the groove is clamp-welded, and after the necessary clamp welding is completed, the fixing of the frame body 1 to the cutting pipe 15 by the engaging metal fitting 5 is released. Remove the main body 1.

As described above, since the individual free bolts 10 and the spacer bolts 11 can slide to arbitrary positions, the straight pipe and the straight pipe as well as the straight pipe and the deformed pipe can be easily fixed and held, and the route can be improved. The interval can be a predetermined interval.

Although the spacer bolts 11 can be slid on the slide bar 9 by the spacer bolt slide bar 13 in the above embodiment, the spacer bolts 11 can be directly attached to the slide bar 9 as shown in FIG. Also, the same action and effect as those of the above-described embodiment can be obtained. Also,
By changing the shape of the spacer terminal 12 attached to the spacer bolt 11, it is possible to match the shape of the groove. Further, even if the spacer bolt 11 is attached to one frame body independently of the slide bar 9, the same action and effect as those of the above-described embodiment can be obtained.

[Effect of device]

As described above, this invention is a spacer mounted on the slide bar by compressing and fixing the pipe to be butt-welded by the frame body and the free bolts of the slide bar slidably mounted in the plurality of slide holes of the frame body. Since the root interval is set to a predetermined interval by the bolt, it has the following effects.

(A) It can be used for welding any combination of straight pipe, deformed pipe, cut pipe, etc.

(B) The route interval and misalignment can be adjusted simultaneously with the same jig.

(C) It is possible to prevent shrinkage of the root interval by clamp welding.

(D) Spacer bolts will not be pinched due to contraction of the root distance due to welding contraction.

(E) Temporary welding is not required for the main pipe.

(F) Welding quality and work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of this invention, FIG. 2 and FIG.
The drawings show the details of the slide bar portion of the above embodiment, FIG. 2 is a front view, FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. 4 is a side view showing the operation of the above embodiment. FIG. 5 is a sectional view showing another embodiment. 1 ... frame body, 2 ... frame piece, 3 ... tube contact surface, 4 ... connecting pin, 5 ... engaging fitting, 8 ... slide hole, 9 ... slide bar, 10 ... free bolt , 11 ...
... Spacer bolts, 12 ... Spacer terminals, 13 ... Slider bar for spacer bolts.

Claims (1)

[Scope of utility model registration request] 1. A frame main body to be mounted on one of a pair of pipes abutting each other, and slide bars slidably inserted into a plurality of slide holes penetrating the frame main body in the axial direction of the pipe. In a pipe outer clamp device having a free bolt that is supported by the tip end of each slide bar and presses and holds the pipe end portion of the other pipe body from the surroundings, contacting the groove surfaces of both pipe members. And a spacer bolt for groove adjustment that presses the tube end of the other tube in the diametrical direction, and a spacer bolt supporting slide bar that is slidably inserted into the same slide hole with respect to the slide bar. An outer clamp device for piping, wherein each of the slide bars is provided with a stopper for preventing the slide bar from falling off from the frame body.