JPH09108859A - Reinforcing bar welding method and reinforcing bar pinching device that is used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable quick execution by bringing into contact, pressing, melting and joining an upper and lower reinforcing bar with impurities pushed out of the joining part. SOLUTION: The butting part of the upper and lower reinforcing bar 1 and 2 is held in a welding material through 3 filled a welding material 31 and a arc 4 is generated. Whereby, the welding material 31 is molten, a slag bath 311 is formed and a gas arc cavity 312 is generated. The front end of the reinforcing bar 1 is inserted into the slag bath 311 in the cavity, and slag bath 311 is electrically energized and kept at 2000 deg.C. The front ends of the upper and lower reinforcing bar 1 and 2 are molten and flattered, and a transient layer changing from a liquid condition to a solid condition is formed in the front end part of the upper and lower reinforcing bar 1 and 2. Thereafter, pressure is applied to the upper and lower reinforcing bar 1 and 2, end surfaces are brought into contact, pressed to form a welding joint, and impurities such as molten iron slags and oxides, etc., are pushed out of the joining part. By this way efficiently is improved and cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kind of reinforcing bar welding method and a clamping device, and more particularly to a method for joining reinforcing bars by using electroslag pressure welding and a clamping device used therefor.

[0002]

2. Description of the Related Art Conventional joining methods for reinforcing bars in buildings mainly include bundling, butt welding, and welding performed by bundling welding materials. The joining methods for these reinforcing bars are Because of the state of stacking and joining, the rebars at the joints are wasted a lot, resulting in an increase in cost, and at the same time, the bearing capacity of the rebar structure is poor. Further, the above-mentioned reinforcing bar joining method requires a specialized operator to carry out the joining, which cannot be performed by an ordinary person, resulting in a considerable labor cost and a great burden on the trader.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a kind of reinforcing bar welding method which has a high construction speed, a short welding time, a simple operation, a convenient operation, a high efficiency and a low cost. Is the main problem, and by providing a kind of clamping device, the welding of rebar is convenient,
The next task is to be able to proceed smoothly.

[0004]

The reinforcing bar welding method of the present invention applies an electric current to the two reinforcing bars to be welded, and generates a huge resistance heat generated in a molten pool formed by melting the welding material by receiving an arc. Utilizing, melt the end portion of the reinforcing bar, and then pressurize to join the reinforcing bar, the reinforcing bar clamping device used in the reinforcing bar welding method of the present invention, one main body, one sliding clamp head, and one Utilizing a combination of fixed clamp heads, the sliding clamp head is adjusted by pivoting the provided screw handle to clamp the upper rebar with its movable clamp seat, and the fixed clamp head is adjusted by pivoting another screw handle. When the lower rebar is sandwiched by one movable clamp seat and the rebar welding work process is carried out, the swing handle provided on one side of the main body should be straightened according to the required processing conditions. , By reversing, it is assumed that unloading or raise the rebar on which sandwiches the slide clamp head.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides a reinforcing bar welding method and a clamping device, in which an electric current is passed through two reinforcing bars to be welded, and a welding material is melted by receiving an arc. Using the huge resistance heat generated in the molten pool, the ends of the reinforcing bars are melted and then pressurized to bond the reinforcing bars.

The clamping device utilizes a combination of one main body, one sliding clamp head, and one fixed clamp head, and the screw handle provided is rotated to adjust the sliding clamp head to be mounted on the movable clamp seat. When the reinforcing bar 1 is clamped, the fixed clamp head is adjusted by turning of another screw handle to clamp the lower reinforcing bar to the other movable clamp sheet, and when carrying out the reinforcing bar welding work process, depending on the necessary processing conditions, By rotating the swing handle provided on one side of the main body in the forward or reverse direction, it is possible to perform the work of pulling up, down, or pressing the upper reinforcing bar sandwiched by the movable clamp sheets of the sliding clamp head.

[0007]

EXAMPLE The steps of the reinforcing bar welding method according to the invention are as follows: a). Arc guiding process: As shown in FIG. 1, the upper rebar 1 and the lower rebar 2 to be welded are held so as to overlap each other on the axis, and one welding material tub 3 is provided at a portion where the upper rebar 1 and the lower rebar 2 contact each other. And a welding material 31 is provided in the welding material trough 3.
, And then let the reinforcing bar communicate with the welding power source, and pull up the upper reinforcing bar 1 upward, under the action of a strong electric current,
An arc 4 is generated between the upper rebar 1 and the lower rebar 2. In the above-mentioned welding power source connection method, one pole of the power source is connected to the upper rebar 1 and the other pole is connected to the lower rebar 2. Further, the components of the welding material 31 therein are as follows: (1) Manganese oxide 3.4 to 38.0% (2) Silicon dioxide 40.0 to 44.00% (3) Magnesium oxide 5 ~ 8% Welding material 31 is glass granules having a red casket color, and the particle size is 8
~ 40 eyes. In addition, the welding material 31 in the welding material trough 3
Before loading, the asbestos cloth or other refractory material 32 is wound around the lower end of the welding material trough 3 to prevent the welding material 31 from falling. b). Arc Process: As shown in FIG. 2, arc 4
Welding material 31 near the arc region due to the high temperature generated
Is melted to form a slag bath 311 and the welding material 31 in the slag bath 311 is converted into steam under the action of high temperature,
One gas arc cavity 3 near the arc region due to the pressure of the steam
12 is generated. Since the outer periphery of the gas arc cavity 312 approaches the molten elastic welding material layer 313, the arc 4 is stably burned in the gas arc cavity 312 by the ionization action of gas. The above-mentioned arc action generates high temperature,
The purpose is to flatten the ends of the reinforcing bars and melt the welding material in the arc area to form a slag bath and a gas arc cavity. Furthermore, the function of the welding material is to increase the thermal energy efficiency of the arc and to chemically reduce the metal at the end of the molten rebar. Moreover, since it is directly received by the welding material, molten iron does not leak downward. In addition, the arc is stably burned by the action of the gas arc cavity formed by the welding material gas. c). Electroslag process: As shown in FIG. 3, after the above process is completed, a slag bath 311 having a certain depth is already formed in the gas arc cavity 312, and at this time, the front end portion of the upper rebar 1 is further Insert into the slag bath 311. Molten slag bath 3 after arc 4 disappears
Since 11 also conducts electricity, an electric current passes through the welding circuit, the electric current passes through the slag bath 311 to generate high heat due to electric resistance, and the temperature of the slag bath 311 is maintained at about 2000 ° C. At this time, the end portions of the upper rebar 1 and the lower rebar 2 are uniformly heated and continuously melted, and the front ends of the upper rebar 1 and the lower rebar 2 are uniformly melted and flattened by the arc burning, and at the same time, At the front end portions of the reinforcing bar 1 and the lower reinforcing bar 2, a transition layer from one liquid state to a solid state is formed. d). Pressure Process: As shown in FIG. 4, after the above-described process, one more suitable pressure is applied to the upper rebar 1 and the lower rebar 2 to bring the end cottons of the upper rebar 1 and the lower rebar 2 into contact with each other, And pressing to form a welded joint. Simultaneously with pressing, impurities including molten iron slag and oxide are extruded from the joint, and the upper rebar 1 and the lower rebar 2 are combined and integrated (as shown in FIG. 5), and at the same time, the welded joint 1
A structural strength of 0 is secured. Regarding the pressurizing signal and pressurizing time in the above pressure process, the welding time is set by one control circuit, and the fact that the welding time has come is generated by the generation of the voice or light emission signal by the control circuit, and the operation is performed by this. Personnel perform the pressurization step. When the predetermined pressurizing time is completed, the control circuit is cut off and the entire welding process is completed. FIG. 8 shows the control circuit of the present invention. The description of the code is as follows. RD: Fusing device V: Voltage meter X: Indicator lamp
M: Electromagnetic switch R1, R2, R3: Relay T: Scheduled switch T1:
Control transformer T2: Welding transformer BZ1, BZ2: Buzzer D1,
D2: Light emitting diode G1, G2: Bridge rectifier circuit M1, M2: Function conversion switch S1a: Push button switch normally open contact S1b: Push button switch normally closed contact S2a: Push button switch normally open contact S2b: Push button switch normally closed contact The functions and operating conditions of the electric circuit shown in FIG. 8 are as follows. 1. Under general welding conditions (when not using the method of the present invention), the function conversion switch M1 is closed. At this time, 2
The 20V voltage is directly passed to the electromagnetic switch, the electromagnetic switch is operated, the normally open contact M is closed, the welding transformer is energized and operated, and manual welding can proceed. 2. When proceeding with the welding operation according to the present invention: The function changeover switch M1 is set to the normally open position, and the function changeover switch M2 is pushed down to be closed, and the electromagnetic switch is turned off. When the push button switch S1a (or S2a) is pushed down after the completion of the preparatory work, the relay R2 (or R3)
Performs the energizing operation, and also causes the relay R1 to perform the energizing operation. At this time, if the push button switch normally open contact S1a (or S2a) is opened, the control circuit can be self-chained (automatically held), the normally open contacts of the relays R2, R1 (or R3, R1F) are closed, and the electromagnetic switch M And, the time switch T is energized and started, the welding transformer is energized, the welding process of the present invention is started, and at one preset time, the normally open contact T of the time switch is closed and the buzzer BZ1 ( Or BZ2)
Then, the light emitting diode D1 (or D2) is operated to generate a voice signal and an optical signal to notify that the welding time has come. At this time, a pressing work is performed on the reinforcing bar to be welded,
At the same time, pushbutton switch normally closed contact S1b (or S2
b) is pushed down, the relay R2 (or R3) is cut off, then the relay R1 is cut off, and the welding transformer stops operating. After depressing the normally open contact of the push button switch, when depressing the normally open contact of another push button switch, the control system does not operate and forms mutual lock protection, thus preventing overloading of the welding transformer T2. . The present invention utilizes two sets of welding heads, as well as the alternate use of two control parts of the electrical circuit, after one set of welding heads has been welded, another set is ready to enter the welding process. Work efficiency is improved by changing the work. In addition, when the execution of the pressure process is completed, after the welding joint is kept warm in the welding material for a few minutes, the welding material trough is removed to release the unmelted welding material, and wait until the welding joint is completely cooled. Then, the slag shell 314 is further shot down, and the entire operation process is completed by the above.
The time from the start to the completion of the execution process of this kind of welding method is generally 20 to 40 seconds, and 5 times the efficiency of other conventional methods (bonding, butt welding, or welding by wrapping welding material). It has the above efficiency.

In order to complete the method of the present invention, it is necessary to provide a holding device for holding the reinforcing bar, and by installing it, the method of the present invention can proceed smoothly, and the holding device of the present invention is:
As shown in FIG. 6, it has one main body 5, a handle 51 is provided at its upper end, and two raceway rods 52 are extended at its lower end. A screw 53 is provided at an appropriate position in the center between the two raceway rods 52, and an interlocking bevel gear 531 is provided at a position inside the main body 5 of the screw 53.
Further, one swing handle 54 is provided at an appropriate position on one side of the main body 5, and the main body 5 of the swing handle 54 is provided.
A drive bevel gear 541 that meshes with and transmits the interlocking bevel gear 531 is provided at a position located inside.

Further, one sliding clamp head 6 is provided between the two raceway rods 52 of the main body 54, and the sliding clamp head 6 slides on the raceway rod 52 by the two slide sleeves 61. Further, the screw sleeve 6 is provided at an appropriate position in the center of the sliding clamp head 6.
2 is provided, and the screw sleeve 62 is mutually screwed with the screw 53 of the main body 5,
As the screw rotates, the screw sleeve 62
Move up and down. In addition, the sliding clamp head 6
One slide groove 63 is provided at the upper end of the slide clamp head 6, and a movable clamp seat 64 is provided at the front end position of the slide clamp head 6. From the rear side of the movable clamp seat 64, a projecting block 641 provided with a screw thread is projected and extended so that the sliding groove 63
It is installed inside (see Fig. 7). Further, one screw handle 65 is provided on the rear side of the slide groove 63 of the sliding clamp head 6, and a protruding block provided with a screw portion 651 provided at the front end of the screw handle 65 and a screw thread of the movable clamp seat 64. The screws 641 are screwed with each other, and when the screw handle 65 is rotated by the handle bar 652 in the forward direction or the reverse direction, the threaded protrusion block 641 causes the movable clamp sheet 64 to tighten or release the reinforcing bar. The clamp head can be used with a variety of different size rebars.

In addition, one fixed clamp head 7 is installed at the lower end portion of the two raceway rods 52 of the main body 5, and one slide groove 71 is provided at the upper end of the fixed clamp head 7, and separately. A movable clamp sheet 72 is provided at the front end position. A projecting block 721 provided with a screw thread extends from the rear side of the movable clamp seat 72, and the sliding groove 71
Further, one screw handle 73 is provided on the rear side of the slide groove 71 of the fixed clamp head 7, and the screw handle 73 is provided with a screw portion 731 at the front end and the screw thread of the movable clamp seat 72. When the screw handle 73 is rotated by the handle bar 732 in the normal direction or the opposite direction, the projection block 721 provided with
Causes the movable clamp sheet 72 to tighten or release the reinforcing bar.

The above-mentioned clamping device has a sliding clamp head 6
The upper rebar 1 is held between the movable clamp seats 64 by turning and locking the screw handle 65 provided therein to adjust the fixed clamp head 7 and the screw handle 73 provided therein. The lower rebar 2 can be clamped by the movable clamp sheet 72 by adjusting. As a result, in the process of performing the reinforcing bar welding operation, if the swing handle 54 provided on one side of the main body 5 is rotated in the forward direction or the reverse direction according to the required processing situation, the driving bevel gear 541 is interlocked with the interlocking umbrella. The gear 531 is driven to rotate, and at the same time, the screw 53 drives the sliding clamp head 6 to move up and down, so that during the arc guiding process, the pulling-up operation of the upper rebar 1 proceeds or during the electroslag process. It is possible to proceed with a step operation such as lowering the reinforcing bar and inserting it in the slag bath, or pressing the upper reinforcing bar 1 and the lower reinforcing bar 2 to combine them during the pressure process.

[0012]

The effects of the method of the present invention are as follows: Welding times are short, typically between 20 and 40 seconds. 2. The efficiency is multifaceted, which is more than 5 times that of the conventional method. 3. The cost is low, which is 1/3 to 1/8 of the conventional cost. 4. Arc light, debris, and smoke are not generated during the entire welding process, and the working environment is good. 5. It is convenient to operate, easy to learn, and has low technical requirements for workers. 6. Construction can be done quickly.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an arc guiding process of the present invention.

FIG. 2 is a diagram showing an embodiment of an arc process of the present invention.

FIG. 3 is a diagram showing an embodiment of an electroslag process of the present invention.

FIG. 4 is a view showing an example of the pressure process of the present invention.

FIG. 5 is a view showing a joint portion of a reinforcing bar after welding according to the present invention.

FIG. 6 is a front view of a sectional embodiment of the clamping device portion of the present invention.

FIG. 7 is a side view of a clamp head sectional embodiment of the clamping device of the present invention.

FIG. 8 is a control circuit diagram of the present invention.

[Explanation of symbols]

1 ... Upper rebar 2 ... Lower rebar 3 ... Welding material vat 31 ... Welding material 4 ... Arc 32 ... Asbestos cloth or other refractory material 311 ... Slag bath 312 ...・ Gas arc cavity 313 ・ ・ ・ Elastic welding material layer 10 ・ ・ ・ Welding joint 314 ・ ・ ・ Slag shell 5 ・ ・ ・ Main body 51 ・ ・ ・ Handle 52 ・ ・ ・ Track rod
53 ... screw 531 ... interlocking bevel gear 54 ... handle 541
・ ・ ・ Driving bevel gear 52 ・ ・ ・ Track rod 6 ・ ・ ・ Sliding clamp head 61 ・ ・ ・ Slide sleeve 62 ・ ・ ・ Screw sleeve 63 ・ ・ ・ Slip groove 64 ・ ・ ・ Moveable clamp seat 641 ・ ・ ・ Screw thread Protruding block 65 with ...
Screw handle 651 ... Screw part 652 ... Handle bar 7 ... Fixed clamp head 71 ... Slip groove 72 ... Moveable clamp sheet 721 ... Projection block provided with screw threads 73 ... Screw Handle 731 ・ ・ ・ Screw part 732 ・ ・ ・ Handle bar

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B23K 37/053 B23K 37/053 G 37/06 301 37/06 301C E04C 5/02 E04C 5/02 E04G 21/12 105 E04G 21/12 105E

Claims (6)

[Claims] 1. A method comprising: a. Arc guiding process: The upper rebar 1 and the lower rebar 2 to be welded are held so as to overlap each other on the axis, and one welding material trough 3 is provided at a portion where the upper rebar 1 and the lower rebar 2 are in contact, and the welding trough 3 Welding material 31 is loaded inside,
After that, the reinforcing bar is made to communicate with the welding power source, and the upper reinforcing bar 1 is pulled upward, and under the action of a strong electric current, the upper reinforcing bar 1,
Generate an arc 4 between the lower rebars b. Arc process: The welding material 31 is melted in the vicinity of the arc area at a high temperature generated by the generation of the arc 4, and the slag bath 311 is used.
And the welding material 31 in the slag bath 311 portion is transformed into steam under the action of high temperature, and one gas arc cavity 312 is generated near the arc section by the pressure of the steam, and the outer periphery of the gas arc cavity 312 is melted. By approaching the elastic welding material layer 313 described above, the arc 4 is stably burned in the gas arc cavity 312 by the ionization action of gas. C. Electroslag process: After the above process is completed, the front end portion of the reinforcing bar 1 is inserted into the slag bath 311 having a certain depth formed in the gas arc cavity 312, and after the arc 4 is extinguished, the molten slag bath is Since 311 conducts electricity, current flows through the welding circuit, and the current flows in the slag bath 311.
Since high heat is generated by electric resistance after passing through, the temperature of the slag bath 311 is maintained at about 2000 ° C, and the ends of the upper rebar 1 and the lower rebar 2 are uniformly heated and continued. Then, the front ends of the upper rebar 1 and the lower rebar 2 are uniformly melted and flattened by the arc burning, and at the same time, the front end portions of the upper rebar 1 and the lower rebar 2 are transition layers from one liquid state to a solid state. To form d. Pressure process: After the above process, one more suitable pressure is applied to the upper reinforcing bar 1 and the lower reinforcing bar 2 to bring the end cottons of the upper reinforcing bar 1 and the lower reinforcing bar 2 into contact with each other and press them to form a welded joint. At the same time as pressing, the molten iron slag and impurities including oxides are pushed out from the joint, and the upper rebar 1 and the lower rebar 2
A reinforcing bar welding method including the above steps a to d, in which the structural strength of the welded joint 10 is secured at the same time. 2. The connecting method of the welding power source is the upper rebar 1
The rebar welding method according to claim 1, wherein one pole of the power source is connected to the lower rebar 2, and the other pole is connected to the lower rebar 2. 3. The components of the welding material 31 are manganese oxide 3.4 to 38.0% and silicon dioxide 40.0 to 4%.
The reinforcing bar welding method according to claim 1, which comprises 4.00% and 5 to 8% magnesium oxide. 4. The reinforcing bar welding according to claim 1, wherein asbestos cloth or another refractory material 32 is wound around the lower end of the welding material trough 3 before the welding material trough 3 is loaded with the welding material 31. Method. 5. A main body (5) is formed, and two raceway rods (52) are extended at the lower end of the main body (5), and a screw (53) is provided at an appropriate position in the center between the two raceway rods (52). The interlocking bevel gear 531 is provided in the main body 5 of the main body 5, the swing handle 54 is provided at an appropriate position on one side of the main body 5, and the swing handle 54 is located in the main body 5 of the main body 5. Is provided with a driving bevel gear 541 that meshes with and transmits the interlocking bevel gear 531. One sliding clamp head 6 is provided between the two raceway rods 52 of the main body 54. A slide sleeve 61 that slides and moves on the track rod 52 by the second slide sleeve 61. A screw sleeve 62 that is screwed into the screw 53 of the main body 5 is provided at an appropriate central position. One guideway 63 to the upper end of the head 6 is provided on the front end position of the sliding clamping head 6 is movable clamp sheet 6
4 is provided, and a projecting block 641 provided with a screw thread is convexly extended from the rear side of the movable clamp seat 64 and installed in the slide groove 63, and the rear side of the slide groove 63 of the sliding clamp head 6 is provided separately. One screw handle 65 is provided in the screw handle 65, and the screw portion 651 provided at the front end of the screw handle 65 and the protruding block 641 provided with the thread of the movable clamp seat 64 are screwed with each other. As one fixed clamp head 7, another slide groove 71 is provided at the upper end of the fixed clamp head 7, and another movable clamp seat 72 is provided at the front end position. A projecting block 721 provided with another thread is extended from the rear side of the clamp sheet 72, and is housed in the slide groove 71 of the fixed clamp head 7.
Another screw handle 73 is provided on the rear side of the slide groove 71 of the fixed clamp head 7, and the screw handle 73 is provided with a screw thread of the movable clamp seat 72 of the fixed clamp head 7 by means of a screw portion 731 at the front end. Characterized in that the projecting block 721 and the sliding block 721 are screwed together, and a reinforcing bar clamping device that is a combination of the above, and is movable by rotating the screw handle 65 of the sliding clamp head 6 and adjusting the sliding clamp head 6. The clamp sheet 64 clamps the upper rebar 1, and the screw handle 73 of the fixed clamp head 7 is swung to adjust the fixed clamp head 7, so that the movable clamp sheet 72 clamps the lower rebar 2 to carry out the reinforcing bar welding work process. The swing handle 5 provided on one side of the main body 5 according to the required processing situation. A rebar clamping device used in the above-described rebar welding method, wherein the movable clamp sheet 64 pulls up or pulls down the upper rebar 1 that is clamped by the movable clamp sheet 64 by rotating 4 in the forward or reverse direction. 6. The reinforcing bar clamping device according to claim 5, wherein a handle 51 is provided at an appropriate position on the upper end of the main body 5.