JP2002005417A - Burner for gas pressure welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner for pressure welding, which is capable of reducing fatigue in a gas pressure welding work effected by the manual operation of a worker. SOLUTION: When a manual burner device 10 having a tip end burner 48 equipped with a supporting member 66 is employed in a gas pressure welding work, the supporting member 66, fixed to the outer peripheral side of the branched pipe 62L of the tip end burner 48, is contacted with a first cylindrical part 28b of a reinforcing bar retaining device 18, whose position is fixed with respect to the reinforcing bars 14, 16 near them, whereby the tip end burner 48 is retained and the fatigue of the worker who repeats the pressure welding work is reduced thereby permitting the prevention of deterioration of the quality of pressure welding which is due to the ununiformity of heating caused by the fatigue.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure welding operation in which a pair of rods having a circular cross section, such as a reinforcing steel bar and a steel bar, are pressed against each other with their shaft ends abutting against each other. And a gas pressure welding burner.

[0002]

2. Description of the Related Art It is known to press a metal bar having a circular cross section such as a reinforcing bar or a steel bar by gas pressure. This gas pressure welding
A pair of bars abutted against each other is heated until it glows by radiating a flame toward the shaft ends thereof, and after the shaft ends of the bars are pressed in a direction approaching each other, the diameter is increased. For example, the cooling is performed by natural cooling. Such a gas pressure welding operation is often performed at a concrete construction site where a large number of rebars are arranged at predetermined intervals.

In the gas pressure welding operation described above, a pair of rods butted against each other is line-symmetric with respect to the center line of an arc-shaped fuel gas pipe surrounding a part of the outer periphery of the shaft end. A gas pressure welding burner that heats by radiating a flame toward the shaft end from a plurality of craters provided at the following positions is used. Such a gas pressure welding burner is generally held manually by an operator, and is also softened to uniformly heat the shaft end portion of the rod material, which is a portion that expands to a large diameter. The bar is reciprocated in the longitudinal direction of the bar and in a direction perpendicular to the bar along the center line of the burner. For example,
This is the burner for gas pressure welding described in Japanese Patent No. 30770.

[0004]

By the way, in the press-contact operation in which the gas press-contact burner reciprocates by the manual operation of the operator as described above, the flame of the gas press-contact burner emits a rod for about 1 to 5 minutes. It is necessary to reciprocate in the longitudinal direction of the bar so that the center of the burner and the center of the bar are concentric with each other and to reciprocate in a direction perpendicular to the bar, so that such pressure welding is performed. The worker who repeatedly performs the work may become fatigued, and the fatigue may cause uneven heating, thereby deteriorating the welding quality.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pressure welding burner capable of reducing fatigue in a gas pressure welding operation by a hand-held operation of an operator.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to press the shaft ends of a pair of rods abutted against each other so that the outer ends of the shaft ends are pressed. In a gas pressure welding burner that heats by radiating a flame from a plurality of craters provided in a fuel gas pipe surrounding a part of the fuel gas pipe toward an axial end thereof, in the vicinity of the rod during the pressure welding operation A support member fixedly provided on the outer peripheral side of the fuel gas pipe is provided in order to support the gas pressure welding burner by bringing the member into contact with a member whose relative position to the rod is fixed. It is in.

[0007]

In this way, during the gas pressure welding operation, the support member fixedly mounted on the outer peripheral side of the fuel gas pipe of the gas pressure welding burner is relatively close to the rod in the vicinity of the rod. Since the gas pressure welding burner is supported by being brought into contact with a member whose position is fixed, fatigue of an operator who repeatedly performs the pressure welding operation is reduced, and the heating also becomes uneven due to the fatigue. As a result, the quality of the pressure welding is prevented from deteriorating.

[0008]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a gas pressure welding device 12 for a reinforcing bar including a manual burner device 10 for gas pressure welding according to an embodiment of the present invention. The gas pressure welding device 12 includes a reinforcing bar holding device 18 that holds a pair of reinforcing bars 14 and 16 having a circular cross section in a state where the reinforcing bars 14 and 16 are brought into contact with each other and their axes are aligned, and hydraulic pressure is applied to the reinforcing bar holding device 18. A hydraulic pump unit 20 for supplying the fuel gas and acetylene gas and oxygen gas as fuel gas to the manual burner device 10;
Gas cylinder 22 with pressure reducing valve for supplying to tank
And an oxygen gas cylinder 24.

The rebar holding device 18 is provided with one rebar 14
A first fixing portion 28a that fixes the side surface of the first fixing portion by pressing the side surface with a bolt 26 and a first cylindrical portion 28b that forms a right angle with the first fixing portion 28a.
A second fixing member 28 is fitted to the fixing member 28 so as to be relatively movable in the one axial direction with respect to the first fixing member 28, and is fixed by pressing the side surface of the other reinforcing bar 16 with the bolt 30.
A second fixing unit integrally including a fixing part 32a and a second cylindrical part 32b which is perpendicular to the second fixing part 32a and is slidably fitted in the first cylindrical part 28b. It includes a member 32 and a hydraulic cylinder 34 fixed to the first fixing member 28 for driving the second fixing member 32, and a switch 36 provided in the manual burner device 10.
Is operated to supply the hydraulic pressure from the hydraulic pump unit 20 to the hydraulic cylinder 34 via the hose 38, so that the opposed shaft ends of the pair of rebars 14 and 16 which are concentric with each other come into contact with each other. As well as being pressed together. First fixing part 28
The first cylindrical portion 28b and the second cylindrical portion 28a are fixed to the pair of reinforcing bars 14 and 16 by being fixed to the second fixing portion 32a so that the pair of rebars 14 and 16 are held with their axes aligned. 32b is parallel to the reinforcing bars 14 and 16.

As shown in FIG. 2, for example, the manual burner device 10 has a longitudinal tubular shape to which acetylene gas and oxygen gas are supplied from an acetylene gas cylinder 22 and an oxygen gas cylinder 24 via a pair of hoses 40 and 42. A base end portion 44, a tip burner 48 having a plurality of craters 46 for emitting a flame to the axial ends of the pair of reinforcing bars 14 and 16, and a space between the base end portion 44 and the tip burner 48. A burner main body 52 having a long connecting pipe 50 to be connected is provided. The base end portion 44 of the elongated tubular shape is also referred to as a gripping tube or a blowing tube, and has an acetylene gas hose port 56 having an acetylene gas valve 54 and an oxygen hose port 58 at the ends.

Between the base end 44 and the connecting pipe 50,
An oxygen valve 60 for setting the flow rate of the oxygen gas is provided, and the mixing ratio of the acetylene gas and the oxygen gas respectively guided through the elongated tubular base portion 44 is adjusted. The tip burner 48 includes a U-shaped U-shaped pipe 61 branched from a connecting portion of the connecting pipe 50, and a pair of branch pipes 62 symmetrically curved in an arc shape from the tip of the U-shaped pipe 61. _L , 62 _R, and the reinforcing bar 14,
16 includes a line-symmetrically in one plane perpendicular to the crater 46 of the plurality the inner circumferential side of the pair of branch pipes 62 _L, 62 _R (8 pieces in this embodiment), the flame injection direction at predetermined intervals toward the approximate center of the arc of the branch pipe 62 _L, 62 _R of the pair 1 is fixed, for example by brazing welding using metal row. Each of the craters 46 is a so-called injection nozzle, and has an injection hole whose diameter gradually decreases toward the tip and has a substantially constant diameter at the tip, and is relatively along the center line of the injection hole. A narrow and long flame jet or flame radiation is formed.

As shown in detail in FIGS. 3 and 4, the tip burner 48 of the manual burner device 10 is provided near the reinforcing bars 14, 16 during the pressure welding operation for heating the butted ends of the reinforcing bars 14, 16. Its rebar 14,
In order to support the tip burner 48 of the manual burner device 10 by contacting it on a parallel member whose relative position is fixed to the member 16, for example, the first cylindrical portion 28 b of the reinforcing bar holding device 18, A support member 66 is provided on one outer peripheral side of the pair of branch pipes (arc-shaped fuel gas pipes) 62 _L and 62 _R.
Is detachably fixed. This support member 66 is the first
Depending on the distance (core height) from the cylindrical portion 28b to the cores of the rebars 14 and 16, they are replaced with appropriate ones.

An elongated tubular base end 44 of the manual burner device 10 has a gripping member 6 to be gripped by an operator.
4 is provided so that the rotational position of the base end portion 44 about the axis can be changed and the fixed position in the axial direction can be changed.
The gripping member 64 is provided with the switch 36 operated to supply the hydraulic pressure from the hydraulic pump unit 20 to the hydraulic cylinder 34 via the hose 38.

For example, as shown in detail in FIGS. 3 and 4, the support member 66 is bent from a band-shaped steel plate, so that the branch pipe 62 is formed in a plane including the pair of branch pipes 62 _L and 62 _R. An arc-shaped portion 68 having a common _L and a center of curvature C, a distal-side fixing portion 70 in which the distal side of the arc-shaped portion 68 is bent at a right angle, and a proximal end provided on the proximal side of the arc-shaped portion 68. And a side fixing portion 72. The base-side fixing portion 72 has an arc-shaped cross section in the longitudinal direction having the same curvature as the tube wall of the U-shaped tube 61.
And a fixing ring 7 for fixing the fixing ring 74 to the U-shaped tube 61.
4 is provided with a fixing screw 76 for reducing the diameter. The fixing ring 74 and the fixing screw 76 are configured in the same manner as a so-called plate type hose bunt, and the supporting member 66 is detached by loosening the fixing screw 76. Further, the arcuate portion 68 is brought into position at a substantially constant gap 78 between the outer of the branch pipe 62 _L in the radial direction passing through the center of curvature C of the branch pipe 62 _L.

The tip burner 4 constructed as described above
In the pressure welding using the manual burner device 10 including the first and second reinforcing members 8, first, the pair of reinforcing bars 14 and 16 are fixed to the reinforcing bar holding device 18 with their shaft ends facing each other.
When the switch 36 is operated, the reinforcing bars 14 and 1
The shaft ends of 6 are brought into close contact. Next, the flame from the crater 46 of the ignited tip burner 48 is applied to the reinforcing bars 14 and 1.
6, the manual burner device 10 is held from the outer periphery of the shaft end toward the axis, whereby the reinforcing bars 14 and 16
Is heated. In this heating step, when the tip burner 48 is appropriately reciprocated in the longitudinal direction of the burner main body 52 and when it is appropriately reciprocated in the axial direction of the reinforcing bars 14 and 16, as shown in FIGS. 5, 6, and 7, for example. First, the first reinforcing member holding device 18 in which the support member 66 is fixed in position with respect to the reinforcing bars
Since the tip burner 48 is supported by being brought into contact with the cylindrical portion 28b, the fatigue of the operator is reduced in the gas pressure welding operation by hand-held operation of the manual burner device 10. When the support member 66 is the first cylindrical portion 28b
When the upper ends are brought into contact, the cores of the rebars 14 and 16 and the center C of the tip burner 48 are made to coincide with each other.

When the vicinity of the shaft ends of the rebars 14 and 16 is red-hot, the switch 36 is operated to operate the rebar 1.
4 and 16 are pressurized in a direction approaching each other and locally bulged radially to about 1.4 times in the vicinity of the shaft end, and the heating is stopped in the pressed state. Is operated to release the pressure.

As described above, the manual burner device 10 having the tip burner 48 with the support member 66 of the present embodiment is used.
According to, the gas pressure work, the tip burner 48 of the branch pipe 62 _L rebar holding device is a stationary contrast support member 66 which is fixed to the outer peripheral side in the vicinity of the reinforcing bars 14 and 16 of 18 Since the tip burner 48 is supported by being brought into contact with the first cylindrical portion 28b, fatigue of an operator who repeatedly executes the pressure welding operation is reduced, and heating becomes uneven due to the fatigue. Deterioration of the pressure welding quality is prevented.

Next, another embodiment of the present invention will be described. In the following description, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 8 and 9 show a tip burner 48 according to another embodiment of the present invention. In the embodiment shown in FIG. 8, the distal end side fixing portion 70 of the support member 66 is bent at a right angle similarly to the above-described embodiment, and the distal end burner 48 is provided.
It is in contact on the outside of the distal end surface portion of the branch pipe 62 _L of. In the embodiment shown in FIG.
Is formed by being turned inward,
It is in contact on the outside of the distal end surface portion of the branch pipe 62 _L of the tip burner 48. In this embodiment, the same effects as those of the above-described embodiment can be obtained.

While the embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, the tip burner 48 of the manual burner device 10 of the above-described embodiment has an arc shape.
It may have a rectangular shape or a U-shape in which a part is cut out for taking in and out the reinforcing bars 14 and 16. Also, part 1
The pair of tip burners 48 may have other shapes, such as a C-shape that is continuous with each other.

According to the above-described embodiment, the support member 6
6, was the branch pipe 62 _L concentric arcuate, may not necessarily be arcuate. In short, what is necessary is just to have a function of supporting the load of the tip burner 48 during the heating operation.

In the above-described embodiment, each crater 46
Branch pipe 62 functioning as gas supply pipe_L, 62_RIs iron
It was a pair of arcs concentric with the streaks 14, 16
62 _L, 62_ROf the arc deviates from the center of the reinforcing bars 14 and 16
You can be there. That is, the reinforcing bar 1
The effective distance to the outer peripheral surface of 4, 16 is
Depending on the hole taper, axial length, diameter, etc.
Change, so by changing them,
Manifold 62_L, 62_RHas a shape close to a straight line
It does not matter. Auxiliary fire for bread grilling
The auxiliary pipe having a mouth is connected to the branch pipe 62._L, 62_RFrom iron
So as to project in the direction parallel to the longitudinal direction of the streaks 14, 16
The tip burner 48 provided may be used.

In the above-described embodiment, a pair of reinforcing bars 14 and 16 having a circular cross section is used. However, a metal bar of another material such as a steel having a circular cross section may be used. Absent.

In addition, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a gas pressure welding device including a manual burner device according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating the manual burner device of FIG.

FIG. 3 is a front view illustrating a configuration of a tip burner used in the manual burner device of FIG. 1;

FIG. 4 is a side view of the tip burner of FIG. 3;

FIG. 5 is a view for explaining a relative positional relationship between the reinforcing bar and the tip burner during the pressure welding operation, wherein the tip burner rotates around the axis of the reinforcing bar while being supported by the first cylindrical portion of the reinforcing bar holding device. It shows a state in which it has been moved.

FIG. 6 is a view for explaining a relative positional relationship between a reinforcing bar and a tip burner during a pressure welding operation, wherein the tip burner is supported by a first cylindrical portion of the reinforcing bar holding device and a longitudinal direction of the manual burner device; 2 shows a state in which it is reciprocated.

FIG. 7 is a view for explaining a relative positional relationship between the reinforcing bar and the tip burner during the pressure welding operation, wherein the tip burner rotates around the axis of the reinforcing bar while being supported by the first cylindrical portion of the reinforcing bar holding device. It shows a state in which it has been moved.

FIG. 8 is a view corresponding to FIG. 3 showing a tip burner according to another embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 3 showing a tip burner of another embodiment of the present invention.

[Explanation of symbols]

10: Manual burner device (gas pressure burner) 14 and 16: reinforcing bar (bars) 28b: first cylindrical portion (member relative positions are fixed) 46: crater 48: tip burner 62 _L, 62 _R: Branch pipe (arc-shaped gas pipe) 66: Support member

Claims (1)

[Claims] 1. A plurality of craters provided in a fuel gas pipe surrounding a part of the outer periphery of the shaft end to press the shaft ends of a pair of rods butted against each other. In a gas pressure welding burner that heats by radiating a flame toward the shaft end, a contact is made on a member whose relative position with respect to the bar is fixed in the vicinity of the bar during the pressure welding. A gas pressure welding burner, comprising a support member fixedly provided on an outer peripheral side of the fuel gas pipe for supporting the gas pressure welding burner.