JPH0731909Y2 - Temporary jig for pipe welding - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a tacking jig which is necessary and effective for closely holding the ends of pipes when performing butt welding of various pipes. .

"Prior art" When butt-welding pipes, TIG welding (tungsten electrode inert gas arc welding) and other automatic welding without the use of filler metal is performed by spot welding, which is called temporary attachment in advance. It is necessary to fix the end faces of the pipes in close contact with each other, and then perform TIG welding to perform circumferential welding.

Further, it is important to minimize misalignment of the pipes and the gap between the end faces during the spot welding in order to perform reliable and favorable circumferential welding.

[Problems to be solved by the invention] Therefore, conventionally, when an operator performs this tack welding, the end faces of the pipes are visually aligned with each other, or the end faces of the pipes are butted along the L-shaped steel. It was spot-welded after performing work such as rubbing. Therefore, there is a difference in the result of the tack welding depending on the skill and the method of the operator, which in turn affects the quality of the circumferential welding result.

For this reason, conventionally, the Japanese Patent Publication No.
As disclosed in Japanese Patent Publication No. 7, a pedestal having V-shaped bearing portions is erected at appropriate intervals in the longitudinal direction of the surface plate,
A pipe fixing jig having a structure in which a pipe is fixed to a pedestal with a fixing band has been proposed.

In the pipe fixing jig disclosed in the above Japanese Patent Publication No. 56-1197, one end of one pipe is brought into contact with a supporting portion on one side of the pipe, and a fixing band is further wound around the pipe. After fixing to the bearing on one side, the other pipe is brought into contact with the bearing on the other side of the jig to align the ends of the pipes in the radial direction, and at the same time, approach the other pipe to the one pipe. Then, the pipes are aligned in the axial direction, and then the other pipe is wound around the support portion with a fixing band so that the butting of the pipes can be completed.

However, in the pipe fixing jig having the above-mentioned structure, although the pipe can be positioned in the radial direction by abutting the pipe on the support portion, there is still a problem that the axial gap adjustment of the pipe still has to be done manually. there were.

In particular, in the field work, when welding is performed while fixing pipes at predetermined locations one after another, the installation position of the pipes is determined, and the end faces of the joints of the pipes should be separated from each other during work. It is in the actual state that it is arranged, and in order to closely contact the end surface of the joint part of each pipe, it is necessary to apply force so as to abut in the axial direction of the pipe and hold it,
In the above-mentioned conventional fixing jig, the abutting in the axial direction is performed manually, and it takes a great deal of labor to closely attach the end faces thereof, and it is difficult to maintain the reliable close contact.

The present invention has been made in view of the above circumstances, and when used in tack welding of pipes, it is possible to perform accurate butting and to perform tack welding of pipes without causing misalignment, and at the same time, in poor conditions such as in the field. It is an object of the present invention to provide a temporary welding jig for pipe welding, which can reliably and easily and closely match pipes even under various working environments.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and a rail seat to be attached to an end of a pipe to be connected and an end to which the rail seat is attached. A support member that receives the one pipe, a fixing band that is wrapped around the one pipe to press and fix the pipe to the support member, and a rail seat along the other end of the rail seat. A movably provided trolley, a support member attached to the trolley to receive the other pipe at a coaxial position with the one pipe, and a support member on the trolley wrapped around the other pipe for the other pipe. And a moving mechanism attached to the rail seat to move the carriage along the rail seat.

[Operation] One pipe is fixed to the support member on one side of the rail seat, the other pipe is fixed to the support member on the carriage on the other side of the rail seat, and the carriage is moved by the moving mechanism. It is possible to accurately abut one pipe with the other pipe. In addition, the pipes can be butted by fixing the pipes to both support members and then the carriage can be moved by the moving mechanism, and the operation is simple, so accurate pipe butting work can be performed easily even in a poor environment such as on-site. .

"Embodiment" FIGS. 1 to 4 show an embodiment of the present invention.
The tacking jig A of this example includes a rail seat 7, a fixed support portion B provided on one end side of the rail seat 7, a moving support portion C provided on the other end side of the rail seat 7, and a moving support portion. The mechanism D is mainly used.

As shown in FIG. 1, the rail seat 7 is a long one that is attached to the end portions of the pipes 12a and 12b to be connected by welding, and as shown in FIGS. It has a U-shape.

A fixed support portion B is provided on the left end side of the rail seat 7 shown in FIG. First, as shown in FIG. 3, a support plate 8 for closing the opening of the rail seat 7 is fixed to the rail seat 7, and a support member 11 made of a square bar is provided on both sides of the upper surface of the support plate 8.
a and 11a are installed in parallel with the rail seat 7 with a predetermined distance therebetween. Since these support members 11a, 11a are for positioning the pipe 12a by contacting the outer peripheral portion of the pipe 12a when the pipe 12a is installed between them, the cross-sectional shape of the support member 8 is a square bar type. In addition, a triangular cross section or a circular cross section may be used, but in any case, as shown in FIG. 2, the support members 11a, 11a are brought into contact with each other and the pipe 12a is provided therebetween.
When installed, the pipe 12a needs to have a shape and size capable of positioning the pipe 12a in the radial direction.

Further, a fixing metal fitting 1a extending in a direction perpendicular to the rail receiving seat 7 is fixed to the bottom surface of the rail receiving seat 7 below the support plate 8, and a flexible fixing band is provided on one end side of the fixing metal fitting 1a. A locking portion 2b for locking one end of 3a is formed. In addition, the other end side of the fixing metal fitting 1a penetrates through the fixing metal fitting 1a and the screw shaft 5
A wing nut 6 is screwed into one end of the screw shaft 5, and a roller 4 is rotatably provided in the vicinity of the screw shaft 5, and the other end of the flexible fixing band 3a is provided. The side passes through the side surface of the roller 4 and is connected to the screw shaft 5.

As described above, the support plate 8, the support members 11a and 11a, the fixing metal fitting 1a, the roller 4, the screw shaft 5, the wing nut 6, and the fixing band 3a constitute the fixed support portion B.

On the other hand, a moving support portion C is provided on the right end side of the rail seat 7 shown in FIG. First, a carriage 9 is housed inside the right end of the rail seat 7 so as to be movable along the rail seat 7, and support members 11b are provided on both sides of the upper surface of a support plate 8 fixed to the upper surface of the carriage 9. , 11b are provided in parallel with the rail seat 7. The support members 11b have the same shape as the support member 11a provided on the support plate 8,
The support member 11b is provided so as to be coaxial with the support member 11a.

Further, as shown in FIG. 4, connecting fittings 17 and 17 projecting below the rail seat 7 are connected to both sides of the support plate 8, and the rail seat 7 and the rail seat 7 are orthogonal to the lower ends of the respective connecting fittings 17 and 17. The fixing metal fitting 1b is connected so as to extend. It should be noted that this fixing metal fitting 1b has a locking portion similar to the fixing metal fitting 1a described above.
2b, a roller 4, a screw shaft 5, a wing nut 6, and a fixing band 3a are provided. The shape of the support fitting 1b provided here is not limited as long as it is fixed to the carriage 9 and is movable along the rail seat 7 and can lock the fixing band 3a.

As described above, the carriage 9, the support plate 8, the support member 11b,
11b, connecting brackets 17, 17, fixing bracket 1b, roller 4, screw shaft 5
The wing nut 6 and the fixed band 3b constitute a moving support portion C.

Further, a moving mechanism D is provided at the right end of the rail seat 7 shown in FIG. First, the receiving plate 13 is provided at the right end of the rail receiving plate 7 so as to extend at a right angle to the rail receiving plate 7, and the trolley 9 has an L-shaped trolley plate 14 protruding from the other end of the rail receiving plate 7. Further, a bolt 15 is provided on the receiving plate 13 so as to pass through the bogie plate 14, and a knob 16 having an adjusting screw hole is rotatably screwed to the tip end side of the bolt 15 penetrating the bogie plate 14. ing. That is, by rotating the knob 16 to move the knob 16 along the bolt 15 and pressing the carriage plate 14, the carriage 9 can be moved to the fixed support portion B side along the rail seat 7. ing. It should be noted that the moving mechanism may have any structure as long as it can move the carriage 9, and thus a structure using a hydraulic cylinder or the like can be used in addition to the above structure.

Next, a case will be described in which the abutting work of the pipes 12a and 12b is performed using the temporary jig A having the above configuration.

When the right side pipe 12b is abutted against the left side pipe 12a shown in FIG.
Install the left pipe 12a between 11a and 11a, and then wing nut 6
Is rotated to tighten the pipe 12a with the flexible fixing band 3, and the pipe 12a is pressed against the support members 11a, 11a to position and fix the pipe 12a as shown in FIG.

Further, the knob 16 is rotated to move the knob 16 in the direction away from the fixed support portion B, and the carriage 9 is moved to the right end side of the rail seat 7 to separate the carriage 9 from the pipe 12a. In this state, the pipe 12b on the right side is installed between the support members 11b, 11b on the carriage 9, and then the wing nut 6 is rotated to tighten the pipe 12b with the flexible fixing band 3b, so that the pipe 12b is supported by the support member 11b. , 11b and fix on the dolly 9. Thus, the right pipe 12b fixed on the carriage 9 is fixed coaxially with the left pipe 12a supported by the fixed support portion B, and the pipes 12a and 12b are positioned in the radial direction.

Next, the knob 16 is rotated to move the carriage 9 along the rail seat 7, the right pipe 12b is moved in the axial direction, and the end of the right pipe 12b is abutted against the end of the left pipe 12a. ,
Position the pipe 12b in the axial direction. At the time of this positioning, the position of the carriage 9 can be finely adjusted by adjusting the rotation of the knob 16, and the positioning of the pipe 12b in the axial direction can also be finely adjusted. With the above operation, the pipe 12a,
The ends of 12b can be accurately aligned in both radial and axial directions.

After this, the butted portions of the pipes 12a and 12b are tack welded by spot welding. This completes the tack welding with no difference between the pipes 12a and 12b.

When the tack welding is completed, the wing nut 6 of the fixed support B is
And the wing nut 6 of the moving support C are rotated to fix the fixed bands 3a, 3b.
Pipe and remove the fixing bands 3a and 3b from the locking part 2b.
The temporary jig A can be removed from a and 12b.

By the above operation, it is possible to perform a good tacking work in which the end faces of the pipes 12a and 12b are completely brought into close contact with each other. Therefore, when the peripheral welding of the pipes is performed after the tack welding, there is an effect that the peripheral welding of good quality can be performed.

If the rail seat 7 is formed to be longer than that shown in the drawing, the central portions of the pipes 12a and 12b should be supported by the support members 11a and 1b.
It is also possible to support by 1a or the supporting members 11b, 11b, and in such a case, there is an effect that even long pipes can be accurately abutted without causing positional displacement due to their weight.

FIG. 5 shows another example of the support fittings provided on the moving support portion C. The support fitting 1b 'of this example is a U-shape extending so as to surround the side portion and the lower portion of the rail seat 7. Is doing.

The support fitting can also be shaped as in this example.

6 and 7 show a second embodiment of the present invention,
The same parts as those of the structure of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The structure of this example is different from the previous embodiment in the structure of the fixing fitting and the structure of the flexible fixing band.

In the structure of this example, the fixing metal fittings 21a and 21b are rod-shaped, one fixing metal fitting 21a is fixed to the bottom of the rail seat 7, and the other fixing metal fitting 21b is only connected to the carriage 9 via the connecting metal fitting 17. It is fixed and can be moved along the rail seat 7 together with the carriage 9.

A flexible fixing band 3a 'for supporting the pipe 12a is fixed to both ends of the fixing member 21a, and a ratchet type fastener 41 is attached to an intermediate part of the fixing band 3a'. Further, the fixed band 3b 'is fixed to both ends of the fixed metal fitting 21b, and a ratchet type fastener 41 is attached to an intermediate part of the fixed band 3b'.

In the structure of this example, the ratchet type fasteners 41, 41 can be operated to fix the pipes 12a, 12b with the fixing bands 3a ', 3b'. You can match exactly.

Next, an example in which the present invention is used for piping work in the field will be described with reference to FIG.

When the pipes 101, 102, 103 to be arranged at desired positions on the site are preliminarily positioned at predetermined positions, for example, by ceiling suspensions 104, 104 'or floor fixtures 105, and then the pipes 101, 102, 103 are joined by welding, the repair of the present invention is performed. The tool A between the joint end surfaces 101A and 102A of the respective tubes 101 and 102, and the tube 101
And 103 are arranged between the joint end surfaces 101B and 103B, and one tube is fixed to the fixed support portion B of the jig A and the other tube is fixed to the movable support portion C by fixing bands 3a and 3b, respectively. . As a result, the axial centers of the tubes are fixed on the jig A so that they coincide with each other.

Next, the moving support C provided on the jig A is moved toward the fixed support B by the moving mechanism D. The joint end surface 102A of the pipe 102 fixed to the moving support portion C is close to the end surface 101A of the pipe 101 fixed to the fixed support portion B, and finally the end surface 1
02A is in close contact with the end surface 101A.

In this way, the joint end faces of the pipe 101 and the pipe 102 are brought into close contact with each other in the state shown by the arrow. Therefore, by holding the moving mechanism D in that state, the joint end faces of the pipe 101 and the pipe 102 are brought into close contact with each other without applying force by the arm force of a person. Can be held. Then, in this state, the temporary attachment work can be easily and surely performed by spot welding.

Similarly, the joint end face 101B of the pipe 101 and the end face 103B of the pipe 103 can also be brought into close contact with each other very reliably and with good workability.

[Advantage of Invention] As described above, according to the present invention, one pipe is supported by the fixed support portion fixed to one end side of the rail seat, and the movable support portion is movably provided on the other end side of the rail seat. After the other pipe is supported on the second pipe, the carriage is moved by the moving mechanism, so that the ends of the two pipes can be accurately brought into contact with each other. Therefore, by using the jig of the present invention, the end portions of the pipes are butted against each other and temporary welding is performed, and temporary welding can be performed without any difference. In addition, the temporary fixing jig of this invention can be used easily even in places where the working environment is bad, such as in a place where the working environment is poor, because it can be used easily without manpower being required. Has the effect of being accurate and quick, and can significantly improve work efficiency.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which one embodiment of the present invention is attached to a pipe, FIG. 2 is a side view of the same state, FIG. 3 is a partial sectional view of a rail seat, and FIG. Sectional view of the rail seat of the mounted part, FIG. 5 is a sectional view of another example of the fixing metal fitting, FIGS. 6 and 7 show a second embodiment of the present invention, and FIG. FIG. 7 is a sectional view showing a state in which the jig of the present invention is mounted on the work site, FIG. 7 is a side view of the same state, and FIG. 1a, 1b, 21a, 21b …… Solid metal fittings, 3a, 3a ′, 3b, 3b ′ …… Fixing band, 7 …… Rail seat, 8 …… Support plate, 9 …… Bogie, 11
a, 11b …… Supporting member, 12a, 12b …… Piping.

Claims (1)

[Scope of utility model registration request] 1. A rail seat mounted on an end of a pipe to be connected, a support member mounted on one end of the rail seat to receive the one pipe, and wrapped around the one pipe. A fixed band for pressing and fixing the pipe to the support member, a dolly movably provided along the rail seat on the other end side of the rail seat, and the other pipe attached to the dolly. A support member that receives the one pipe at a coaxial position, a fixing band that is wrapped around the other pipe to press and fix the pipe to the support member on the truck, and a rail support that is attached to the rail seat to receive the truck. A temporary welding jig for pipe welding, comprising a moving mechanism that moves along a seat.