KR100590288B1 - Crank welding apparatus for steel concrete slab - Google Patents

Abstract

The present invention relates to a welding device for manufacturing a truss girder deck plate for reinforced concrete slab for construction, in particular, a welder for welding the truss girder and the deck plate and a welding device for fusion welding the lower chord and crank of the truss girder by a conveyor It is related with the crank welding apparatus of the truss girder deck plate for reinforced concrete slabs which made it possible to manufacture the large quantity of truss girder deck plates for reinforced concrete slabs, without performing a manual operation.

The crank welding device of the truss girder deck plate for reinforced concrete slab according to the present invention, the deck plate forming the ceiling of each floor in the steel structure of the building, and the upper and lower chords arranged at regular intervals on the upper side of the deck plate A truss girder deck plate for reinforced concrete slab for construction comprising a truss girder comprising a lattice material supported by the upper chord and the lower chord and bonded to the deck plate, and a crank bonded to the front end and the rear end of the lower chord. In the crank welding device for producing a, the base is installed so that the truss girder deck plate for reinforced concrete slab is transported, and the truss girder deck plate for reinforced concrete slab installed and transported on one side of the base is stopped at the welding position When reminded A holder for restraining a current to be seated in an accurate position, a crank alignment means disposed on one side of the base and arranged in a predetermined direction, and a predetermined number of cranks sequentially supplied, the crank alignment means and the base Transport means for seating between the crank supplied from the crank alignment means is placed on the end of the truss girder deck plate for reinforced concrete slab, and the truss girder deck plate for reinforced concrete slab is installed on one side of the base When mounted on the end of the welding means for welding the crank and the truss girder deck plate for reinforced concrete slab, and the base and the holder, the crank alignment means, the conveying means, whether the driving means is adjusted step by step based on the input data Control to be Characterized in that the included.

Truss girder deck plate for reinforced concrete slab, deck plate, truss girder, upper chord, lower chord, crank

Description

Crank welding device for truss girder deck plate for reinforced concrete slab {CRANK WELDING APPARATUS FOR STEEL CONCRETE SLAB}             

1 is a front view showing a truss girder deck plate for reinforced concrete slab produced by a welding apparatus according to the present invention,

Figure 2 is a block diagram showing a crank welding device for reinforced concrete according to the present invention,

Figure 3 is a side view showing the crank alignment means of the crank welding device for reinforced concrete according to the present invention,

Figure 4 is a plan view showing a crank alignment means 5 of the crank welding device for reinforced concrete according to the present invention,

5 is a front view showing a conveying means and a welding means of the crank welding device for reinforced concrete according to the present invention,

Figure 6 is a block diagram showing a welder of the crank welding device for reinforced concrete according to the present invention,

7 is a plan view showing a contact welder of the crank welding device for reinforced concrete according to the present invention.

<Explanation of symbols on main parts of the drawings>

10: welder 15: base

20: conveyor 22: roller

24: chain 30: second stopper

32: cylinder 34: blocking plate

40: third stopper 50: electrode

60: welding electrode 70: holder

70a: first holder 70b: second holder

70c: third holder 72: support

74: rotation axis 76: arm

78: drive device 140: transfer means

142: holder 144: first rod

146: second load 148: forceps

150 welding means 152 second fixing table

154: third load 156: fourth load

158: welding wire 159: heat source means

200: crank alignment means 210: table

220: chain 230: first stopper

232: cylinder 234: blocking plate

The present invention relates to a welding device for manufacturing a truss girder deck plate for reinforced concrete slab for construction, in particular, a welder for welding the truss girder and the deck plate and a welding device for fusion welding the lower chord and crank of the truss girder by a conveyor It is related with the crank welding apparatus of the truss girder deck plate for reinforced concrete slabs which made it possible to manufacture the large quantity of truss girder deck plates for reinforced concrete slabs, without performing a manual operation.

In recent years, most of the building structures are composite reinforced concrete structures that use both concrete as a compression material and reinforcing steel as a tensile material, which constructs formwork to form the outer surface of concrete and injects construction and concrete to reinforce reinforcement on the formwork. When the curing is completed by the dismantling work to remove the formwork, there was a problem that the air is long.

Accordingly, most recently constructed truss girder deck plate (slab) structure for reinforced concrete slab is constructed a truss girder deck plate for reinforced concrete slab for formwork between beams and beams, truss for reinforced concrete slab By supplying concrete to the upper part of the girder deck plate, construction and dismantling of formwork is unnecessary, so that the construction and finishing work of the structure can be performed at the same time.

However, the above-described truss girder deck plate for reinforced concrete slab is not only required to install and dismantle the formwork, but also requires a separate process of joining the reinforcing steel structure and the deck plate for strong fixing between the surface of the deck plate and the concrete. In addition to the need for additional airlift, the reinforcement process takes a lot of airlift as in the general formwork process.

In addition, the crank of the truss girder deck plate for reinforced concrete slab according to the prior art is the S-joint crank, the lower end of which extends only to the upper surface of the deck plate so that the lower part of the crank is integrally welded to the steel frame structure, and the lower end of the crank is the lower side of the deck plate There is a RC tank crank that extends further to prevent the rolling or detachment when placing concrete by tying or welding the cranks with each other by wire, and the worker must install the crank manually by separating the S tank crank and the RC tank crank. The task is complicated.

The present invention has been made to solve the above problems of the prior art, the main welding machine for joining the truss girder and the deck plate, the welding device for joining the crank to the lower chord of the truss girder is connected by a conveyor, Alignment means for aligning the cranks and supplying them one by one is installed on one side of the conveyor to make mass production of truss girder deck plates for reinforced concrete slabs for a short period of time with minimal defect rate. The purpose is to provide a welding device.

Crank welding device of the truss girder deck plate for reinforced concrete slab according to the present invention for solving the above problems, the deck plate forming the ceiling of each floor in the steel structure of the building, and maintaining a constant interval on the upper side of the deck plate Reinforcement rods comprising a truss girder composed of arranged upper and lower chords, a lattice material supported by the upper and lower chords and joined to the deck plate, and a crank bonded to the front and rear ends of the lower chords. A crank welding device for manufacturing a truss girder deck plate for a concrete slab, the base having a conveyor so that the truss girder deck plate for reinforced concrete slab is transported, and the truss girder for reinforced concrete slab installed and transported on one side of the base Deck plate A holder for restraining the lower chord and stopping at the welding position to be seated at the correct position, and a crank alignment means arranged at one side of the base to arrange the crank in a predetermined direction and supplying a predetermined number of cranks sequentially; And a transfer means installed between the crank alignment means and the base to seat the crank supplied from the crank alignment means on the end of the truss girder deck plate for reinforced concrete slab, and the crank is reinforced by the transfer means installed on one side of the base. Welding means for welding the crank and the truss girder deck plate for reinforced concrete slab when seated at the end of the truss girder deck plate for concrete slab, and whether the base and the holder, the crank alignment means, the conveying means, and the driving means are driven. Step by step Characterized in that it includes a control unit that can be adjusted.

Hereinafter, an embodiment of an automatic welding device for a truss girder deck plate crank welding process for reinforced concrete slab according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view showing a truss girder deck plate for reinforced concrete slab produced by the truss girder deck plate crank welding apparatus according to the present invention.

The truss girder deck plate 5 for reinforced concrete slab produced according to the present invention, a plurality of bent portions (1a) protruding in parallel in one direction to the deck plate (1) forming the ceiling of each floor of the building is formed by bending The truss girder 2 is joined between the portion 1a and the bent portion 1a to form a truss girder deck plate 5 for reinforced concrete slab.

Here, the truss girder 2 is arranged such that one upper chord 2a and a pair of lower chords 2b form a vertex of a triangle so as to be disposed at a position of a vertex of a triangle, and the upper chord 2a and a lower By joining a pair of lattice materials 2c that are bent in a wave shape on both sides of the chord 2b, the upper chord 2a and the lower chord 2b can be continuously installed while maintaining a predetermined interval. The lower end of the truss girder 2 is bent outward, and the bent portion is joined to the bent portion 1a of the deck plate 1 to form a truss girder deck plate 5 for reinforced concrete slab.

In addition, the method of connecting the truss girder 2 and the deck plate 1, as described in one embodiment, the crank welding apparatus according to the present invention is any type of truss girder deck plate for reinforced concrete slab Any product may be used as long as the crank 4 is welded to the end of the current 2b.

In addition, since both ends of the upper chord 2a and the lower chord 2b are welded so that the ends of the lower chord 2b are restrained, the strength of the truss girder 2 is further improved. do.

Here, the crank 4 is divided into an S tank crank and an RC tank crank, wherein the S tank crank is formed so that the length of the lower end thereof corresponds to the upper surface of the deck plate so as to be directly welded to the curved structure. The crank for RC tank is to extend the lower end of the lower plate further to the lower side of the deck plate to bind or weld the cranks with each other so as not to be pushed or separated when placing concrete.

The need for an automatic welding device to produce a truss girder deck plate for reinforced concrete slab as described above, Figure 2 is a block diagram showing a crank welding device of the truss girder deck plate for reinforced concrete slab according to the present invention to be.

Crank welding device for reinforced concrete according to the present invention, the base 15, the conveyor is installed so that the truss girder deck plate (5) for reinforced concrete slab is transported, and the reinforced concrete slab is installed and transported on one side of the base (15) When the truss girder deck plate 5 is stopped at the welding position, the holder 70 is configured to restrain the lower chord 2b to be seated at the correct position, and the crank 4 is disposed at one side of the base 15. Is arranged in a constant direction, and the crank alignment means 200 is installed between the crank alignment means 200 and the crank alignment means 200 and the base 15 so that a predetermined number of cranks 4 are sequentially supplied. Transfer means 140 for mounting the crank (4) supplied from the end of the truss girder deck plate (5) for reinforced concrete slab, and is installed on one side of the base (15) transfer means 140 When the crank 4 is seated at the lower chord 2b end of the truss girder deck plate 5 for reinforced concrete slab, the crank 4 and the truss girder deck plate 5 for reinforced concrete slab are welded together. Means 150 and installed on one side of the base 15 to weld the truss girder 2 and the deck plate 1 before the truss girder deck plate 5 for reinforced concrete slab is transferred to the holder 70 The main welder 10, the base 15 and the holder 70, the crank alignment means 200, the transfer means 140, the welding means 150, and whether the drive of the contact welder is stepwise by input data. It is configured to include a control unit that can be adjusted.

Here, the holder 70 is arranged as shown in Figure 2, is configured as shown in Figures 6 and 7 bar, installed on the rear of the base 15 for the truss girder deck for reinforced concrete slab The first holder 70a for the front end of the plate 5 to correspond to the welding means 150, and the rear end of the truss girder deck plate 5 for reinforced concrete slab is installed in front of the welding means 150 The second holder 70b to be corresponded is included.

The welder 10 is installed on the rollers 22 and the rollers 22 installed on the base 15 as shown in FIGS. 6 and 7 so that the deck plate 1 is transferred. When the deck plate 1 is supplied by the conveyor 20 and the conveyor 20, the bottom surface of the portion to be welded is in contact with the deck plate 1 while supporting the deck plate 1. When the deck plate 1 is seated on the electrode 50 and the electrode 50 to apply a current, the lower chord 2b is restrained laterally so that the truss girder 2 is used to accurately determine the deck plate 1. When the truss girder (2) is seated by the third holder (70c) and is installed to be movable in the vertical direction on the upper side of the electrode 50 to be disposed in the position is moved downward Welding electrode 60 for fusion between lattice material 2c and deck plate 1 It consists included.

The three holders 70 as described above, that is, the first holder 70a, the second holder 70b, and the third holder 70c are installed on the upper surface of the base 15 so that a predetermined distance is maintained. 72, a plurality of rotary shafts 74 provided on the support 72, and a plurality of rotary shafts 74 rotatably mounted laterally to restrain the pair of lower chords 2b from the lateral direction. The lower current while allowing the pair of arms 76, the drive 78 to open the arms 76 laterally, and the arm 76 opened by the drive 78 to be restored to its original state. A spring 79 for restraining 2b is included.

In addition, the holder 70 is installed between the roller 22 and the roller 22 of the base 15 so as to be protruded upwards, and is disposed in front of the holder 70 to provide the deck plate 1. It further comprises a second stopper 30 to determine whether the transfer, and a third stopper 40 is installed to the rear of the holder 70 so that the deck plate 1 is seated in the correct position.

Here, the second stopper 30 and the third stopper 40, the blocking plate 34, 44 provided so that the deck plate 1 is no longer transported between the roller 22 and the roller 22 to be projected. ) And cylinders 32 and 42 connected to the lower end of the blocking plate.

Thus, when power is applied to the welding apparatus according to the operator's operation, the conveyor 20 is driven in accordance with the rotation of the driving apparatus so that the deck plate 1 and the truss girder 2 of the main welding machine 10 along the rollers. When the second stopper 30 is lowered, the deck plate 1 is moved along the roller 22 to be seated by the third stopper 40 when the second stopper 30 is lowered. 1 is seated at a position corresponding to the electrode 50.

At this time, the truss girder deck plate 5 for the reinforced concrete slab is conveyed after the arm 76 is laterally spread along the rotation shaft 74 by the driving device 78 of the third holder 70c. When the truss girder deck plate 5 for reinforced concrete slab is seated by the third stopper 40, the arm 76 is rotated inwardly by the spring 79 and the arm 76 is rotated. The groove formed at the end of the truss girder deck plate 5 for reinforced concrete slab is completely fixed while being in close contact with the outer circumferential surface of the lower chord 2b so that the welding operation can be performed at the correct position.

Subsequently, when the welding electrode 60 is lowered and the bent portion 1a of the deck plate 1 is pressed, an arc is generated between the welding electrode 60 and the deck plate 1 to which power is applied, thereby electric welding. Because of this, the bent portion (1a) of the deck plate (1) is fused to the floor, the lattice material (2c) is restrained and the truss girder (2) and the deck plate (1) is combined.

Figure 3 is a side view showing a crank alignment means of the crank welding device for reinforced concrete according to the present invention, Figure 4 is a plan view showing a crank alignment means of the crank welding device for reinforced concrete according to the present invention.

The crank alignment means 200 is disposed on one side of the transfer means 140, a plurality of grooves 212 is formed so that the crank 4 is caught in each of the grooves 212 and transported to the table 210 ), And is mounted on the table 210 to be welded at once by restraining the chain 220 for moving the crank 4 and the crank 4 carried by the chain 220 when rotated by the drive device. It is configured to include a first stopper to be supplied only in quantity.

Here, the table 210 is formed such that a pair of grooves 212 are formed at the center thereof so that three rows of cranks 4 can be aligned, as shown in FIG. 4, and the side of the grooves 212. Chains 220 are formed at each end, and a driving device connected to the chain 220 is connected to the crank 4 to be transported along the chain 220 when the driving device is rotated according to a user's operation. Only three cranks 4 to be moved at a time by the first stopper 230 are supplied side by side.

Here, the first stopper 230 is a cylinder 232 driven by hydraulic pressure or pneumatic pressure, and a blocking plate 234 is installed on a rod of the cylinder 232 so that the blocking plate 234 is protruded. The crank 4 is moved along the chain 220 rotated by the driving device when the rod is inserted into the cylinder 232 to suppress the progress of the crank 4 and is moved downward. Bar is to be supplied, the locking jaw 240 is installed at the outer end of the table 210, so that the crank 4 is moved along the chain 220 to prevent the table 210 from being separated out of the outside do.

As a result, the crank alignment means 200 can selectively supply the S tank crank and the RC tank crank according to whether or not the crank 4 is supplied by the operator, and the S tank crank and the RC tank crank are required by the control of the control unit. Ensure that adequate supplies are provided.

5 is a front view showing a conveying means and a welding means of the crank welding device for reinforced concrete according to the present invention.

The conveying means 140, the fixing rod 142 disposed on one side of the base 15, the first rod 144 rotatably connected to the fixing rod 142 and driven by hydraulic pressure, and A second rod 146 rotatably installed on the first rod 144 and driven by hydraulic pressure, and rotatably installed on an outer end of the second rod 146 to simultaneously hold the three cranks 4. The tongs 148 for supplying the crank 4 to the end of the lower chord 2b of the truss girder deck plate 5 for the reinforced concrete slab are configured.

The transfer means 150 is installed on one side of the base 15, as shown in Figure 2, the deck plate 1 is installed between the pair of crank alignment means 200 is the first plate If it is restrained by the holder 70a, the crank 4 is picked up from the crank alignment means 200 provided at the position corresponding to the first holder 70a, and the crank 4 at the front side end of the lower chord 2b. The crank 4 is picked up from the crank alignment means 200 installed at a position corresponding to the second holder 70b when the deck plate 1 is restrained by the second holder 70b. By allowing the crank 4 to rest on the rear side end of the lower chord 2b, the end is closed by allowing the crank to be welded to the front end and the rear end of the deck plate 1.

The welding means 150 is rotatably connected to the second fixing stand 152 and the second fixing stand 152 installed on the other side of the base 15 and driven by driving of hydraulic, pneumatic or motor. A third rod 154, a fourth rod 156 rotatably installed at an end of the third rod 154 and driven by hydraulic, pneumatic, or motor driving, and the fourth rod 156 A welding wire 158 provided at an end and fused with the crank 4 to the lower chord 2b, a heat source means 159 connected to the welding wire 158 to provide thermal energy, and the welding means 150 The oil container 157 is installed on one side and includes an oil container 157 to prevent the accumulation of welding sludge by immersing the frame supporting the welding wire 158 in the middle of the welding process.

In addition, the welding means 150, as shown in Figure 2, a pair of welding means 150 is installed at a position corresponding to the first holder 70a, and a position corresponding to the second holder 70b. When the deck plate 1 is located in the first holder 70a, the crank 4 is supplied to the front end of the lower chord 2b, and the deck plate 1 is supplied to the second holder 70b. If so, the crank 4 can be supplied to the rear end of the lower chord 2b.

Looking at the operation of the truss girder deck plate crank welding device for reinforced concrete slab according to the present invention configured as described above are as follows.

First, when power is applied to the welding apparatus according to the operator's operation, the conveyor 20 is driven according to the rotation of the driving apparatus so that the deck plate 1 and the truss girder 2 follow the roller 22 and the main welding machine 10. When the second stopper 30 is lowered, the deck plate 1 is moved along the roller 22 to be seated by the third stopper 40 when the second stopper 30 is lowered. ) Is seated at a position corresponding to the electrode 50.

At this time, after the cylinder of the third holder 70c is driven and the arm 76 is laterally opened along the rotation shaft 74, the truss girder deck plate 5 for reinforced concrete slab is moved by the conveyor 20. When the truss girder deck plate 5 for reinforced concrete slab is seated by the third stopper 40, the arm 76 is rotated inwardly by the spring 79 to the end of the arm 76. Since the formed groove is in close contact with the outer circumferential surface of the lower chord 2b, the truss girder deck plate 5 for reinforced concrete slab is completely fixed so that the welding operation can be performed at the correct position.

When the welding electrode 60 descends and presses the bent portion 1a of the deck plate 1, an arc is generated between the welding electrode 60 and the deck plate 1 to which power is applied, thereby performing electrical welding. As the bent portion 1a of the deck plate 1 is fused to the bottom, the lattice material 2c is constrained so that the truss girder 2 and the deck plate 1 are combined.

In addition, the truss girder deck plate 5 for reinforced concrete slab is transferred to the base 15, and is seated at the correct position of the base 15 by the first holder 70a, and the first holder. As the 70a restrains the lower chord 2b from the lateral direction, the truss girder 2 and the deck plate 1 are disposed at the correct position.

Thereafter, the transfer means 140 is driven to move the crank 4 disposed on the crank alignment means 200 to be caught by the front end of the lower chord 2b, and the welding means is driven to crank ( 4) and the front end of the lower chord 2b are fused together.

Thereafter, when the conveyor 20 is driven to move the deck plate 1 in the direction of the arrow shown in FIG. 2, and is seated at the position corresponding to the second holder 70b by the third stopper 40 again, By the same process, the crank 4 is fused to the rear end of the lower chord 2b to form the truss girder deck plate 5 for reinforced concrete slab.

In this case, the welding means 150 is controlled so that the frame for supporting the welding wire 158 is contained in the oil container 157 in the middle of the welding process, so that the welding sludge is mounted on the frame where the welding wire 158 is installed. By preventing accumulation, the truss girder deck plate for reinforced concrete slabs can be manufactured more beautifully.

Automatic welding device of the truss girder deck plate crank welding process for reinforced concrete slab according to the present invention configured as described above, the truss girder deck plate for reinforced concrete slab is seated in the correct position by a plurality of stoppers and holders, And a first welding machine for fusion of the truss girder and the deck plate by the welding electrode, and the truss girder deck plate for the reinforced concrete slab is seated in the correct position by the stopper and the holder, and then cranked at both ends of the lower chord by the transfer robot. And a second welding machine which allows the crank to be welded to the lower chord and the deck plate by the welding robot, and an alignment device for supplying the crank to the transfer robot, can be produced to achieve mass production of the truss girder deck plate for reinforced concrete slab. For reinforced concrete slabs It is possible to reduce the time and cost required for the production of truss girder deck plates, and the welding operation that requires the most accuracy in manufacturing truss girder deck plates for reinforced concrete slabs is performed by the first and second welders. Since the device can be easily and quickly achieved, the defect rate of the truss girder deck plate for reinforced concrete slabs is lowered, thereby increasing the reliability of the product.

Claims (7)

Deck plate constituting the ceiling of each floor in the steel structure of the building, and the upper and lower chords arranged at a predetermined interval on the upper side of the deck plate, the lattice material is supported and bonded to the deck plate, the upper and lower chords, A crank welding device for manufacturing a truss girder deck plate for reinforced concrete slab for construction comprising a truss girder composed of cranks joined to the front end and the rear end of the lower chord; A base on which a conveyor is installed such that the truss girder deck plate for the reinforced concrete slab is transferred; A holder for restoring the lower chord when the truss girder deck plate for reinforced concrete slab installed and transported on one side of the base is stopped at the welding position; Crank alignment means arranged on one side of the base so that the cranks are arranged in a constant direction and a predetermined number of cranks are sequentially supplied; A transfer means installed between the crank alignment means and the base to seat the crank supplied from the crank alignment means at the end of the truss girder deck plate for reinforced concrete slab; A welding means installed at one side of the base to weld the crank and the truss girder deck plate for the reinforced concrete slab when the crank is seated at the end of the truss girder deck plate for the reinforced concrete slab by a conveying means; Truss girder deck plate crank welding device for reinforced concrete slab, characterized in that the control unit for controlling the base and the holder, the crank alignment means, the conveying means, whether the driving means is driven in step by input data. The method of claim 1; The holder is provided at the rear of the base so that the front end of the truss girder deck plate for reinforced concrete slab corresponds to the welding means, and the rear end of the truss girder deck plate for reinforced concrete slab is installed at the front side. Truss girder deck plate crank welding device for reinforced concrete slab, characterized in that it comprises a second holder to correspond to the welding means. The method of claim 1 or 2; The holder is a support that is installed so as to maintain a predetermined interval on the base surface, a plurality of rotary shafts installed on the support, and a plurality of rotatably installed on the rotary shaft in a lateral direction to restrain a pair of lower chords from the side direction Reinforced concrete, characterized in that it comprises a pair of arms, a drive device for opening the arms laterally, and a spring for restraining the lower chord while restoring the arm opened by the drive device to its original state Automatic welding device for truss girder deck plate crank welding process for slab. The method of claim 3; The holder is provided between the roller and the roller of the base so as to be protruded upwards, the second stopper disposed in front of the holder to determine whether or not to transfer the deck plate, and installed behind the holder and the deck plate The truss girder deck plate crank welding device for reinforced concrete slab further comprises a third stopper to ensure that it is seated in the correct position. The method of claim 1; The crank alignment means is disposed on one side of the conveying means, and a plurality of grooves are formed so that the cranks are caught by the respective grooves, and the cranks are installed on the table and rotated by a driving device to move the cranks. The truss girder deck plate crank welding device for reinforced concrete slab, characterized in that the chain and the first stopper for restraining the crank carried by the chain so as to supply only the amount to be welded at a time. The method of claim 1; The conveying means may include a fixing rod disposed on one side of the base, a first rod rotatably connected to the fixing rod and driven by hydraulic pressure, and a first rod rotatably installed on the first rod and driven by hydraulic pressure. 2 rods and tongs rotatably installed at the outer end of the second rod to grab three cranks at the same time so as to feed the crank to the lower chord end of the truss girder deck plate for the reinforced concrete slab disposed on the body. Truss girder deck plate crank welding device for reinforced concrete slab, characterized in that. The method of claim 1; The welding means may include a second fixing rod provided on the other side of the base, a third rod rotatably connected to the second fixing rod, a fourth rod rotatably installed at an end of the third rod, and the fourth rod. A welding wire installed at an end of the rod to weld the crank to the lower chord, a heat source means connected to the welding wire to provide heat, and installed at one side of the welding means, and oil is freshly watered to remove the welding sludge. Truss girder deck plate crank welding device for reinforced concrete slab, characterized in that the oil container is included.

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