JPS6327916Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a jig used for manual enclosure welding of bar-shaped steel materials such as reinforcing bars.

This type of conventional hand-enclosed welding jig is
The copper backing was a U-shaped integral backing with a cross section that accommodated approximately half the circumference of the steel butt portion to be welded. For this reason, if the enclosure weld progresses upwards and reaches near the top of the reinforcing bars, and finish welding is performed to add a little extra welding to the surface of the reinforcing bars,
When removing the welding jig, slag may accumulate in the wedge-shaped gap between the inner wall of the backing metal and the reinforcing bars, or the diameter of the reinforcing bars may become thicker due to excess welding, making removal extremely difficult. There was a problem.

The present invention was devised in order to solve the above-mentioned problems with the conventional hand-enclosed welding jig, and its gist is to use the conventional backing metal. is the backing metal body, and a pair of left and right split backing metals are prepared at both ends of the backing metal body in the circumferential direction, respectively, so as to be located on the extension line of the backing metal body, and when setting for welding, the backing metal body is After welding is completed, the slag grooves are provided on the inner walls of the backing metal body and the split backing metal to control the flow of slag. This is the point where it leads to this groove.

Next, an embodiment of the manual enclosure welding jig of the present invention will be described with reference to the drawings. Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a front view, Figure 2 being a plan view, Figure 3 being a side view, and Figure 4a being a side view. 1 is a sectional view taken along line A-A in FIG.
FIG. 4b is an explanatory diagram of the operation of FIG. 4a, and FIG. 5 is a sectional view taken along line BB in FIG. 2. Reference numeral 1 in the figure is the backing metal body, which is made of the same material and has the same shape as the conventional copper backing metal, and its cross-sectional shape is, needless to say, accommodating approximately half the circumference of the steel butt portion to be welded. ing. Reference numeral 1' denotes a slug groove provided in the inner wall of the backing metal body 1 in the circumferential direction. Reference numeral 2 denotes a split backing metal, and when the main welding tool is set at the butt portion of steel materials to be welded, it is placed at both ends of the backing metal body 1 in the circumferential direction as shown in Fig. 4a, and after the welding is completed. When the welding jig is removed, the welding jig is movable outward in the circumferential direction. A slug groove 2' is also provided on the inner wall of this backing metal 2. Reference numeral 3 denotes a connecting plate for making the split backing metal 2 movable. It is pivoted to 2. Note that an elongated hole 3c is provided on the side of the fixing pin 3b, allowing it to slide about 5 mm in the direction shown by the arrow in the figure. Reference numeral 4 denotes a fixing box that houses the entire backing body, and jig support devices 8 for fixing the main welding jig to the steel material (reinforcing bars, etc.) are provided on both sides of the fixing box in the longitudinal direction of the steel material. A fixing screw 7 for fixing the backing metal body 1 is provided at the bottom of the fixing box 4. Further, a fixing plate hinge 6 is provided on the outside of the split backing 2, so that the split fixing plate 5 can be tilted 180 degrees in the circumferential direction as shown in FIG. 4b. In addition, FIG. 4b also shows the sliding movement of the split backing metal 2 by the connecting plate 3. Reference numeral 9 denotes a steel material support plate forming a part of the jig support device 8 , and is provided on both sides of the fixing box 4 in the longitudinal direction of the steel material on an extension line thereof. This steel support plate 9
is provided with a clamping plate 10 facing this, one circumferential side of each is reversibly fixed by a clamping plate hinge 11, and the other side is locked by a stopper 12. ing. 13 is a presser piece, and 14 is its tightening bolt, both of which are provided at approximately the center of the circumferential direction of the tightening plate 10, whereby the jig is tightened and supported on the steel material. . At this time, it must be remembered to maintain a predetermined root spacing at the steel butt portion.

Next, the procedure for using the manual enclosure welding jig of the present invention having the above structure will be explained. First, in order to support this jig to the steel material abutment part, as shown in Figs. The other jig support device 8 is supported and fixed to the end of the other steel material while maintaining the spacing, but in this case, it is preferable to position the groove of the root spacing approximately at the center of the jig. It is essential. Then the fourth
As shown in the figure, split backing metals 2 are set at both ends of the backing metal body 1 in the circumferential direction. It can be stably and reliably installed in any reinforcing bar posture. Next, a welding rod is inserted between the roots of the reinforcing bars from above in the figure, and upward welding is performed continuously from the bottom side of the backing metal body 1, that is, from the bottom of the reinforcing bars. The slag generated in this case flows from the gap between the backing metal body 1 and the steel material to be welded at the center of the weld into the slag groove 1' shown in FIG.
and does not interfere with continuous enclosure welding. Note that the depth of the slag grooves 1' and 2' may be approximately 5 mm. Furthermore, when the welding progresses and reaches near the top of the reinforcing bars, there is a slight extra heap than on the surface of the reinforcing bars, so it was difficult to remove the backing metal from the reinforcing bars with conventional jigs, but with the jig of the present invention. In this case, loosen the tightening bolts 14 of the jig support device 8 to release the tightening plate 10, then tilt the split fixing plate 5 outward, and then move the left and right split backings 2 outward in the circumferential direction. Slide it towards the direction. In this way, the upper part of the backing metal body 1 is made wider by about 5 mm on both the left and right sides, so that the jig can be removed very easily.

As explained above, the hand-enclosed welding jig of the present invention is extremely easy to remove from the steel material after welding, and the number of parts constituting the jig is small, so it is inexpensive and It has the advantage that it is easy to install, strong and stable.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and Figure 1 is a front view;
Fig. 2 is a plan view, Fig. 3 is a side view, Fig. 4a is a sectional view taken along line AA in Fig. 1, Fig. 4b is an explanatory diagram of the operation of Fig. 4a, and Fig. 5 is a diagram of Fig. 2. It is a BB sectional view. 1...Backing metal body, 1'...Slag groove, 2...
Split backing metal, 2'... slag groove, 3... connecting plate,
4...Fixing box, 5...Divided fixing plate, 6...Fixing plate hinge, 7...Fixing screw, 8 ...Jig support device, 9
... Steel support plate, 10 ... Tightening plate, 11 ... Tightening plate hinge, 12 ... Stopper, 13 ... Presser piece, 1
4...Tightening bolt.

Claims (1)

[Scope of utility model registration request] A backing metal body with a cross-sectional shape that accommodates approximately half the circumference of the steel material butt portion to be welded, and a backing metal body set at both circumferential ends of the backing metal body so as to be movable outward in the circumferential direction when removed. 1. A jig for manual enclosure welding, comprising a pair of left and right split backing metals, and a slug groove is provided in the circumferential direction on the inner wall of the backing metal body and the split backing metal.