JP4197833B2 - Steel welding and press-fitting equipment and welding and press-fitting methods - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of an apparatus and a welding / press-in method for welding a steel member of a unit length in order and press-fitting into a ground in a place where a space restriction, particularly a height restriction is imposed by an upper structure .
[0002]
[Prior art]
Conventionally, steel members such as steel pipe piles used for the repair and reinforcement of railway bridges, road bridges, or general existing buildings have been shortened to a certain unit length due to the upper spatial constraints. Therefore, a press-fitting method in which steel members are joined mainly by welding and press-fitted into the ground using a press-fitting device such as a hydraulic jack has been implemented.
[0003]
FIG. 11 shows a conventional press-fitting method using a press-fitting device. The first steel member W ₁ is press-fitted using a hydraulic jack J which took a reaction force to the upper structure B, and joint K stacking the following steel member W ₂ on the steel member W ₁ Weld and further press fit. Then, from the stage where the stroke of the hydraulic jack J becomes maximum, the spacers S are sequentially added to perform press-fitting to a desired depth.
[0004]
[Problems to be solved by the invention]
The press-fitting method using the steel member press-fitting device described above has the following problems.
[0005]
(A) When steel members used in railway bridges, road bridges, and general existing buildings are renovated and reinforced, the upper working space is constrained when there is an existing upper structure and the height is restricted. Inevitably, the member length L is shortened to a certain unit length, so that the number of joints increases and the work period becomes longer due to the welding operation.
[0006]
(B) Although joining of steel members is mainly performed by welding, in order to reduce the number of welding operations, it is advantageous to make the member length L as long as possible. Therefore, since the joining position H (height above the ground) between the steel members can be suppressed as low as possible, the working environment such as the working posture becomes severe and quality control becomes very difficult.
[0007]
(C) When the upper structure B or a member attached to the existing structure is used as a reaction force, the hydraulic jack J is installed under the existing structure B. Only the member length L is further shortened and the number of joints is increased.
[0008]
(D) In the press-fitting process, due to the limit of the stroke of the hydraulic jack, after the jack stroke reaches the maximum, it is necessary to press-fit several press-fitting spacers while sequentially adding them. Compared to the case where there are no restrictions, the man-hours and the construction period are greatly increased.
[0009]
(E) Since it is necessary to alternately perform welding joining work and press-fitting work, the work is mixed, the process is prolonged, work efficiency is not improved, and an irrational work is performed.
[0010]
(F) The welding joining work is generally performed by an arc welding method by a welder. In some cases, a welding robot is used for labor saving, but since the welding robot also performs only the arc welding part, the work period of the joining work is not improved so much and the work period of the whole work is not greatly reduced.
[0011]
An object of the present invention is to solve the above-mentioned problems of the prior art , that is, in a place where a steel member manufactured to a certain unit length is subjected to a spatial restriction due to an existing structure existing above . We provide welding and press-fitting methods that can be used in common for both the welding process and press-fitting process, and that can be carried out quickly and reasonably without the need for setup change, and the welding and press-fitting methods that are performed using this equipment. It is to be.
[0012]
[Means for Solving the Problems]
As means for solving the above problems, a welding / press-in apparatus for steel members according to the invention described in claim 1 is:
The following components are mounted on a movable frame body that is movable by attaching a caster 4 to the bottom surface of the rigid frame 1 that is substantially U-shaped with one side open when viewed in the plane direction. It is a device used in a place where the height is restricted by the upper structure B,
In the substantially U-shaped rigid frame 1, guides 2 and 3 are provided in the vertical direction on the inner side surfaces of the opposing arm portions, respectively, and a pair of upper and lower annular clamp mechanisms 10 and 20 that grip the steel member W. Are arranged along the guides 2 and 3 so as to be movable up and down.
Each of the upper and lower clamp mechanisms 10 and 20 is composed of a combination of semi-annular fixed portions 11 and 21 and movable portions 12 and 22 that are equivalent to halves of the ring surrounding the outer periphery of the steel member W. The parts 11 and 21 are supported and guided by the two guides 2 and 3 facing each other, and the movable parts 12 and 22 positioned on the opened side of the substantially U-shaped rigid frame 1 are One end thereof is rotatably fixed to one end of the fixing portions 11 and 21 by pins 13 and 23, and the other end is attached to the other end of the same fixing portions 11 and 21 by detachable pins 14 and 24 so as to be freely opened and closed. In addition, a plurality of clamping hydraulic jacks 15 and 25 for gripping or releasing the enclosed steel member W are installed inward in the annular clamp mechanisms 10 and 20 that form a pair of upper and lower sides,
A plurality of upset actuators 5 for bringing the same pair of clamp mechanisms 10 and 20 closer to or away from each other between the pair of upper and lower clamp mechanisms 10 and 20 are connected in parallel with the guides 2 and 3. In the clamping mechanism 10, a reaction force receiving portion 7 that takes a reaction force on the upper upper structure B is provided upward at a position immediately above or near the position where the upset actuator 5 is coupled, and the pair of upper and lower clamps One end of an elevating means 6 that supports the mechanisms 10 and 20 as a whole and moves in the vertical direction is attached to the guides 2 and 3 of the rigid frame 1, and the other end is connected to one clamp mechanism 10 or 20,
It is configured to include a welding electrode 8 connected to a position close to the top and bottom of the joining position K of the two steel members W ₁ and W ₂ that are stacked and contacted vertically.
The steel member W having a unit length opens the movable portions 12 and 22 of the pair of upper and lower clamp mechanisms 10 and 20 and receives them in the lateral direction, closes the movable portions 12 and 22, and moves the elevating means 6 and the upset actuator 5 together. The reaction force receiving portion 7 is actuated to exert a reaction force on the upper structure B, and the steel member W is clamped by the lower clamp mechanism 20, and the steel member W is press-fitted by driving the upset actuator 5. was carried out, receiving laterally open movable portion 12 and 22 having the next order of the steel member W ₂ similarly a pair of upper and lower clamping mechanisms 10 and 20, the steel member W ₁ of the preceding the steel member W ₂ The welding electrode 8 is connected in the vicinity of the joint position K between the two upper and lower steel members W ₁ and W ₂ , and the upset actuator 5 is operated to perform flash welding with pressurization. Joining There are taking a reaction force receiving unit 7 in the reaction force to the upper structure B, the clamped state in which gripped the steel member W ₂ in the lower clamping mechanism 20, performing a press-fitting of the steel member by driving the upset actuator 5 Is.
[0016]
The welding / press-in method for steel members according to the invention described in claim 2 is:
Using the steel member welding and press-fitting device according to claim 1, the steel members W of unit length are sequentially stacked at a place where the height is restricted by the upper structure B above, and the joining position thereof by welding a K a welding and press-fit method of press-fitting the unit length Dzu one steel member W,
Accept the steel member W in the transverse direction to open the movable portion 12 and 22 of the clamping mechanism 10, 20 of the welding and the press-fitting device, contact by stacking the steel member W on the steel member W ₂ of the prior is allowed, and a clamping state in which the gripped by the clamp mechanism 10, 20 forming a pair up and down two steel member W _1, W ₂ and up and down respectively, and the two steel members W _1, W ₂ of the joining position K connect the welding electrodes 8 in the vicinity, was heated by passing a high current intermittently to the joining position K of the steel member W _1, W ₂ through the welding electrodes 8, the steel member W by upsetting actuator 5 a method of joining two steel member _W 1, _{W 2} in _{1, W} flash welding method that pressurize joining position K of _2,
A clamping mechanism 10, 20 forming a pair up or down to an unclamped state, by operating the lifting means 6 and upset actuator 5, the reaction force receiving section 7 takes the reaction force above the upper structure B, the lower As a clamped state in which the steel member W is gripped by the clamp mechanism 20, the lower clamp mechanism 20 is driven downward by the upset actuator 5 to press-fit the steel member W , and the lower clamp mechanism 20 is A step of pulling up a fixed stroke by the lifting means 5 in the unclamped state, setting the clamped state in which the steel member W is gripped by the lower clamping mechanism 20 again , and pressing the steel member W by driving the upset actuator 5 is performed . And the step of repeatedly press-fitting the steel member W.
[0017]
The invention described in claim 3 is a method of welding and press-fitting steel members according to claim 2 ,
The press-fitting of the steel member W by upsetting actuator 5, vibration Shinano vertically, characterized in that the advancing et pressure input.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the welding and the press-fitting devices and welding and press-fitting method of a steel member according to the invention described in claim 1 3 will be described with reference to FIGS. 1 to 10.
[0019]
The steel member welding and press-fitting device shown in FIGS. 1 and 2 has a caster 4 on the bottom surface of a rigid frame 1 having a U-shape with one side opened on the right side when viewed in a plane direction as shown in FIG. constructed by mounting each component to the mobile frame which is movable mounted, that have portability. Guides 2 and 3 are provided in the vertical direction on the inner side surfaces of the arm portions facing each other of the rigid frame 1, and can be moved up and down along the U-shaped guide grooves formed in the guides 2 and 3. A pair of upper and lower annular clamping mechanisms 10 and 20 having clamping means for gripping the manufactured member W are disposed.
[0020]
The upper clamp mechanism 10 and the lower clamp mechanism 20 are each composed of semi-annular fixed portions 11 and 21 guided by the pair of guides 2 and 3, and semi-annular movable portions 12 and 22, respectively. As shown in FIG. 2, the ring body surrounding the outer periphery of the steel member W has a form equivalent to a half. The movable portion 12 and 22 is supported by stop rotatably to one end of the fixing portion 11 and 21 respectively at one end by fixing pins 13 and 23, the same fixing unit 11 by the other end to attach and detach the closing pin 14, 24 , Ru Tei attached openably to the other end of 21. In the upper and lower clamping mechanisms 10 and 20 that form an annular shape, hydraulic jacks 15 and 25 for clamping that grip or release the steel member W are installed in an inward centripetal arrangement.
[0021]
A plurality of upset actuators 5, 5,... Are connected between the pair of upper and lower clamp mechanisms 10, 20 in parallel with the guides 2, 3 , via insulating materials. Actuator 5 for upset, which upon flash welding to be described later serves also as a function of pressure (upset) the junction K of the steel member W, then the ability to press fit the steel member W in the ground, the hydraulically hydraulic reciprocating type jack for expansion and contraction is being used. However, the upset actuator 5 as long to achieve the previous SL functions, not limited to the hydraulic jack operated by hydraulic pressure. Any actuator that can perform displacement / weight control may be used. In the case of the illustrated example, the cylinder portion 5a of the upset actuator 5 is fixed to the upper clamp mechanism 10 and the rod portion 5b is attached to the lower clamp mechanism 20, but it can also be implemented in an upside down manner. The reaction force receiving portions 7 project from the upper portion of the upper clamping mechanism 10 at a position immediately above each upset actuator 5 or in the vicinity thereof. However, the reaction force receiving portion 7 may be mounted and implemented in a free state by a pin mechanism or the like so as to be able to cope with level inconsistency due to the inclination of the upper structure B or other causes.
[0022]
The upset actuator 5 configured as described above has a pressurizing capacity of 30 to 50 N / mm ² per cross-sectional area required at the time of upset. For example, when the cross-sectional area of the steel member W is 20000 mm ² , the pressing is performed so as to have a pressure capacity of 600 KN to 1000 KN. The upset actuator 5 is a mechanism that realizes an operation speed of 30 mm / SEC required during upset.
[0023]
Cylinder mounting portions 2a and 3a are formed in a horizontal arm shape on the upper part of the guides 2 and 3 described above, and a cylinder upper end portion of a lifting cylinder 6 which is a lifting means driven by hydraulic pressure is attached. The lower end portion 6 a of the output rod of the elevating cylinder 6 is attached to the lower clamping mechanism 20.
[0024]
A welding electrode 8 for passing a welding current at the time of flash welding, which will be described later, in an arrangement close to the top and bottom of the joining position K (FIG. 9b) of the steel member as an element belonging to the upper clamping mechanism 10, and for this welding A welding transformer 9 for supplying a low voltage and large current to the electrode 8 is disposed (FIG. 9). The welding transformer 9 is connected to a power supply device (not shown).
[0025]
Next, the welding and press-fitting method implemented using the steel member press-fitting device configured as described above will be described.
[0026]
First, FIG. 3, for setting the steel member W ₁ to the welding-indentation device, the movable portion 12 and 22 of the pair of upper and lower clamping mechanisms 10, 20 open approximately 180 °, using a construction machine such as a crane (not shown) the steel member W ₁ that hung Te, moved in the horizontal direction indicates a step to position hanging to the welding-pressed position.
[0027]
FIG. 4 closes the movable parts 12 and 22 of the upper and lower clamp mechanisms 10 and 20, retracts the elevating cylinder 6 to the limit, lifts (raises) the lower clamp mechanism 20, and then rods the upset actuator 5. the part 5b by extending action, the clamping mechanism 10 of the upper increased the reaction force receiving section 7 shows the step of taking the reaction force by intimate contact with the reaction force receiving section 7 above the superstructure B. In this step, the plurality of clamping hydraulic jack 25 clamped thereby grasp the steel member W ₁ is actuated (see FIG. 2) of the lower clamping mechanism 20.
[0028]
5, by extending operating the actuator 5 for upsetting downwards, shows the steps of advancing one step press-fitting operation of the steel member W _1. At this time, the elevating cylinder 6 is in a floating state. The press-fitting operation may be performed statically or may be performed dynamically in an oscillating state in which the upset actuator 5 is vibrated in the vertical direction (the invention according to claim 3 ). When the press-fitting operation is performed while vibrating, the output for press-fitting can be reduced.
[0029]
One step of the press-fitting work of the steel member is performed until the stroke of the upset actuator 5 is maximized. Thereafter, the clamping hydraulic jack 25 of the lower clamping mechanism 20 is released to an unclamped state, and the lower clamping mechanism 20 is moved upward by contracting the raising / lowering cylinder 6 to perform reordering. In a state where the upsetting actuator 5 again the most contracted to clamp the steel member W ₁ by operating the clamping hydraulic jacks 25 of the lower clamping mechanism 20 again performs the press-fitting work of the second step. By repeating several times this press-fitting operation, press-fitting the steel member W ₁ to a predetermined depth position.
[0030]
6, to set the steel member W ₂ having the next order, and upper and lower re-opened the clamping mechanism 10 and 20, the appropriate stroke of the clamping position and upset actuator 5 to the flash welding joint K after adjusting shows a stage Komu hanging steel member W ₂ into the device. In FIG. 7, the upper and lower clamping mechanisms 10 and 20 are closed to complete the setting, and the steel members W ₁ and W ₂ are clamped by the clamping hydraulic jacks 15 and 25 of the upper and lower clamping mechanisms 10 and 20 to make the steel. connect the welding electrodes 8 to be described later to a predetermined position of the member W ₂ (see FIG. 9) shows a step of performing a flash welding. The flash welding process is shown in FIG.
[0031]
In FIG. 9A, two steel members W ₁ and W ₂ that are vertically opposed to each other are clamped by upper and lower clamping mechanisms 10 and 20, respectively, and welding electrodes 8 and 8 connected to a welding transformer 9 are connected. showing a state of connecting the junction vicinity of the steel member W _1, W _2.
[0032]
FIG. 9B shows that the two steel members W ₁ and W ₂ are stacked and brought into contact with each other, the two steel members W ₁ and W ₂ are butted at the joint K, and the welding transformer 9 to the welding electrode. 8 and 8 show a stage in which a large current is intermittently applied to perform flash heating.
[0033]
FIG. 9C shows a stage where the upsetting actuator 5 is operated to pressurize the joints K of the two steel members W ₁ and W ₂ to complete flash welding.
[0034]
When the flash welding is finished, as described with reference to FIG. 4 again, the upper and lower clamp mechanisms 10 and 20 are put into an unclamped state, and the lower clamp mechanism 20 is raised to the upper limit by the lifting cylinder 6. Then the actuator 5 for upset by expansion operation, the reaction force receiving portion 7 of the clamping mechanism 10 of the upper to the state taking the reaction force to the upper structure B. Then, as shown in FIG. 8, clamp the steel member W ₂ at the bottom of the clamping mechanism 20 is to initiate the stuffing step.
[0035]
Thereafter, if necessary, the press-fitting process and the flash welding process described above are repeated for a required number of steel members, a steel pipe pile having a predetermined length is constructed, and the press-fitting work is completed. When flash welding is used, a specific burr is generated. If this burr is inconvenient in terms of appearance or structure, it is cut using a die (not shown) attached to the joint surface side of the upper and lower clamp mechanisms 10 and 20. Also do.
[0036]
FIG. 10 shows a comparison of the lengths of steel members in the case of using the welding / press-in method according to the present invention and the conventional method in comparison with the left and right. In the conventional method shown on the right side, the unit length (member length L) of the steel member is restricted to be short by the length of the jack J for press-fitting and the lower limit position of the joint portion K that can be welded. However, according to the method of the present invention shown on the left side, the lower part of the steel member is clamped by the lower clamp mechanism 20 to perform press-fitting, and the press-fitting actuator 5 is arranged in parallel with the steel member. The unit length L of the steel member can be increased.
[0037]
Since flash welding is used for welding the joint K, the welding technician does not need to monitor the welding situation as in arc welding, and welding is performed automatically. It can be lowered to just before, and the member length L of the steel member can be increased.
[0038]
However, the present invention is not limited to the above-described embodiments, and various embodiments are possible within the scope of design and application normally performed by those skilled in the art. For example, by changing the shape of the clamp mechanism, the steel member shape can be applied not only to the cylindrical shape but also to steel members with various cross-sectional shapes, such as H-shaped cross-sectional shape, box-shaped cross-sectional shape, or corrugated shape member. Of course. The present invention can also be applied to a concrete member such as a PC pile having a steel portion at the end.
[0039]
【The invention's effect】
According to the present invention, the following effects can be obtained in the operation of repeatedly welding and press-fitting steel members.
(A) The unit length of the steel member can be increased to reduce the number of joints.
(B) The welding time by flash welding can be reduced.
(C) The refilling operation in the welding / pressing process can be omitted or reduced.
(D) By press-fitting while vibrating, the press-fitting load can be reduced, and in the case of a pile, the supporting force can be increased.
[Brief description of the drawings]
FIG. 1 is an elevational view showing a steel member welding and press-fitting device according to the present invention.
FIG. 2 is an AA arrow view of FIG.
FIG. 3 is an explanatory view showing a state in which a steel member is set in a welding / press-in apparatus for a steel member.
FIG. 4 is an explanatory view showing a state in which a clamp mechanism is closed in a welding / press-fitting device for steel members.
FIG. 5 is an explanatory view showing a press-fitted state in a steel member welding / press-fitting device.
FIG. 6 is an explanatory view showing a state in which the next steel member is set in the welding / press-in apparatus for steel members.
FIG. 7 is an explanatory view showing a state in which a clamp mechanism is closed in a welding / press-fitting device for steel members.
FIG. 8 is an explanatory diagram showing a steel member press-fitted state after flash welding by a steel member welding / press-fitting device.
FIGS. 9A, 9B and 9C are explanatory diagrams showing flash welding processes. FIGS.
FIG. 10 is a comparative view for explaining the effect of a welding / press-in method for steel members.
FIG. 11 is an explanatory view showing a conventional method for press-fitting steel members.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Frame 2, 3 Guide 5 Upset actuator 6 Lifting cylinder 7 Reaction force receiving part 8 Welding electrode 10, 20 Clamp mechanism 11, 21 Fixed part 12 22 Movable part 15 25 Hydraulic jack for clamp
B Upper structure W, W ₁ , W ₂ steel member

Claims (3)

The upper structure above is constructed by mounting the following components on a movable frame body that can be moved by attaching a caster to the bottom of a rigid frame that has an approximately U shape with one side open when viewed in the plane direction. A device used in places where the body is subject to height restrictions,
In the substantially U-shaped rigid frame, guides are provided in the vertical direction on the inner side surfaces of the opposing arms, and a pair of upper and lower annular clamp mechanisms that grip the steel member can be moved up and down along the guides. Are located in
Each of the pair of upper and lower clamping mechanisms is composed of a combination of a semi-annular fixed portion and a movable portion, which is equal to a ring body that surrounds the outer periphery of the steel member, and the fixed portion is connected to the two guides facing each other. In the supported and guided configuration, the movable part located on the open side of the substantially U-shaped rigid frame is rotatably pinned at one end to one end of the fixed part, and the other end is fixed the same. It is attached to the other end of the part by a detachable pin so that it can be freely opened and closed, and a plurality of hydraulic jacks for clamping that grip or release the enclosed steel member are installed inward in this pair of upper and lower annular clamp mechanisms And
Between the upper and lower clamp mechanisms, a plurality of upset actuators for bringing the same pair of clamp mechanisms closer to or away from each other are connected in parallel with the guide, and the upset actuators are connected in the upper clamp mechanism. A reaction force receiving portion that exerts a reaction force on the upper structure at the upper position or in the vicinity thereof is provided upward, and further supports the pair of upper and lower clamp mechanisms as a whole, and moves up and down to move up and down. One end of which is attached to the guide of the rigid frame, the other end is connected to one clamp mechanism,
It is configured to have a welding electrode connected to a position close to the top and bottom of the joining position of the two steel members stacked and abutted up and down,
The steel member of unit length opens the movable part of the pair of upper and lower clamp mechanisms and accepts it in the lateral direction, closes the movable part, operates the above lifting means and upset actuator and the upper part of the reaction force receiving part is the upper structure The reaction force is applied to the body, the steel member is gripped by the lower clamp mechanism, and the steel member is press-fitted by driving the upset actuator. Open the movable part of the mechanism and accept it in the horizontal direction, stack the steel members on the preceding steel member and contact them, connect the welding electrodes near the joining position of each of the two upper and lower steel members, Actuate the upset actuator to join by flash welding with pressurization, then apply the reaction force to the upper structure at the reaction force receiving part, and clamp the steel member with the lower clamping mechanism Characterized in that performs a press-fitting of the steel member by driving the chipset actuator, welding and press-fitting apparatus of the steel member. Using the steel member welding and press-fitting device according to claim 1 above, steel members of unit length are sequentially stacked at a place where the height is restricted by the upper structure above , and the joining positions are welded. a welding and press-fit method of press-fitting the unit length Dzu one steel member and,
Open the movable part of the clamp mechanism of the welding and press-fitting device to receive the steel member in the lateral direction, stack the steel member on the preceding steel member and bring them into contact with each other, and attach the two upper and lower steel members respectively vertically and clamped state in which the gripped by the clamp mechanism forming a pair, and to connect the welding electrodes in the vicinity of the joining position of the two steel members, a large current through the welding electrode to the bonding position of the steel member heated by passing intermittently, the steps of joining the two steel members with flash welding method that pressurize the joint position of the steel member by the upsetting actuator,
The clamping mechanism forming a pair up or down to an unclamped state, by operating the elevating means and upset actuator, the reaction force receiving portion takes a reaction force on the upper structure of the upper, the steel member at a lower clamping mechanism as a clamp state in which grabbed the drives clamping mechanism subordinate downwardly upset actuator performs press-fitting of the steel member, further the lower clamping mechanism and unclamped constant stroke pulling in lifting means, again It is a clamped state in which a steel member is gripped by a lower clamp mechanism, and the step of press-fitting the steel member by repeating the step of press-fitting the steel member by driving the upset actuator is characterized in that , Welding and press-fitting methods for steel members. The press-fitting of the steel member by upsetting actuator is vertically vibrating article is characterized in that the advancing et pressure input, welding and press-fitting method of a steel member according to claim 2.

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