JPH0531575A - Method and device for fixing diaphragm in square steel pipe column - Google Patents

Abstract

PURPOSE:To charge and weld a diaphragm at a prescribed inside position without unnecessarily cutting a square steel pipe with a closed section longer than the length of a column. CONSTITUTION:This device is constituted of a fixing mechanism A in which a backing strip 3 is held in the top end, a fixing mechanism B in which a diaphragm 2 is held, a body part C by which these fixing mechanisms are clamped in freely attachably and detachably, a driving mechanism D by which these parts are inserted into and taken out from the square steel pipe column 1. The fixing mechanism A is constituted of a holding part by which the backing strip 3 is held on each side of a square slightly smaller than the inside area of the square steel pipe column, an expanding and contracting mechanism by which the backing strip 3 held by the holding part is pulled in and stretched out against the inner face of the square steel pipe column, an opening and closing lever 15 which is provided with high friction bodies 14 and the mechanism to open and close the lever. The fixing mechanism B is constituted of a fitting part 41 by which the diaphragm having a through-hole in the center is fitted, a guide lever 45 by which the diaphragm 2 is introduced and held inside the square steel pipe column and a mechanism to open and close the guide lever.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for fixing a diaphragm in a rectangular steel pipe column used for high-rise buildings such as steel structures and steel concrete structures.

[0002]

2. Description of the Related Art At the joints between square steel tube columns and steel beams used for high-rise buildings such as steel structures and steel concrete structures,
In order to transfer the stress such as shearing force and moment from the beam to the column, it is common to attach a plate material called diaphragm in the direction corresponding to the beam flange inside the rectangular steel pipe column in the direction of extending the beam flange. . The diaphragm and the column member are usually firmly fixed by welding in order to ensure the reliable transmission of the stress. On the other hand, since the central portion of the diaphragm has an extremely low stress density, even if a cut hole or the like is provided in the center, there is no practical problem.

In the case where the rectangular steel tube column is manufactured by assembling four steel plates, a diaphragm is inserted and fixed in the intermediate step of assembling the column body, but the steel tube is formed into a square section. When the closed cross-section material is used as a square steel pipe column, the diaphragm must be inserted from the pipe end and welded and fixed in place. People can enter the inside of square steel pipe columns with large dimensions, but
Since it is difficult to use a diaphragm with a side length of 1 m or less, conventionally, a square steel pipe column is purposely cut every time one diaphragm is inserted, the diaphragm is inserted and welded, and then the column body is joined by welding to obtain a predetermined column length. Is being done.

In this specification, the case where the diaphragm is temporarily fixed to the inner surface of the rectangular steel pipe by frictional force is distinguished as "fixing", and the whole mounting process including fixing and welding is distinguished as "fixing". Generally, for example, in the roll forming method, a square steel pipe is manufactured by cutting it into a length of about 10 to 15 m, but since the mounting interval of the beams in the pillar is about 4 m, the square steel pipe manufactured by the above method is 3 mm long. It has to be divided into 4 parts, and further, enormous work such as groove processing, welding of backing plate and welding for welding this to the original length is required, and the finished appearance is also bad.

Therefore, in order to eliminate such uneconomical work, for example, according to Japanese Patent Laid-Open No. 61-279362, a self-propelled welding device having a variable position welding device and a member supply device is provided in a closed cross section material. To the inner peripheral surface of the closed cross-section material while rotating the welding torch along the inner peripheral surface of the closed cross-section material by advancing and retracting from one of the openings and supplying and fixing the member at each predetermined position with the member supply device. It has been proposed to weld and join automatically.

11 and 12 show a part of an embodiment according to Japanese Patent Laid-Open No. 61-279362, in which 51 is a self-propelled welding device, 52 is a traveling device, 53 is a member supply device, and 54 is variable position welding. Equipment, 55
Is a welding torch among them, 1 is a square steel pipe column (closed cross-section material), 2 is a diaphragm, and 3 is a backing material. FIG. 11 shows that the self-propelled welding device 51 is used to cause the member supplying device 53 to grip the backing material 3 and weld it to the predetermined position of the rectangular steel pipe column 1 by the variable position welding device 54. After that, the self-propelled welding device 51 is once retracted to the outside of the left rectangular steel tubular column 1, the member supply device 53 is gripping the diaphragm 2, and the member 2 is traveling toward the attachment position.

Further, according to Japanese Patent Laid-Open No. 64-53778, a steel pipe having a closed curve in cross section is vertically erected and secured, and then an outer peripheral edge adapted to the inner wall of the steel pipe cross section is provided from an upper end opening thereof. Inserting an elevating table equipped with a means for detachably holding the inner diaphragm and a means for automatically welding between the outer peripheral edge of the diaphragm and the inner wall surface of the steel pipe, and after stopping this at a predetermined position, welding is performed. Is proposed.

FIG. 13 shows an embodiment of a diaphragm used in the invention disclosed in Japanese Patent Laid-Open No. 64-53778, in which four corners of a quadrangular outer shape are cut out in a fan shape, and each side has a backing metal holder 3a. A backing plate 3 that is sandwiched between the diaphragm 2 and the diaphragm 2 and expands and contracts in the radial direction is provided, and a through hole 2a is formed in the center of the diaphragm 2 to extend from the lift through the through hole before starting welding. By operating the pressing means, the end surface of each backing metal is brought into contact with the inner wall surface of the steel pipe 1. In FIG. 12, the left half shows the state before the pressing operation and the right half shows the state after the pressing operation.

FIG. 14 shows a state in which a lift guide 51 for holding a diaphragm and at the same time a lift 51 'having a welding machine head set therein is attached to the upper end of the steel pipe 1, and a lift 51 holding the diaphragm 2 at the tip. 'Acts at a predetermined position in the steel pipe, the backing metal pressing means 59 is operated to bring the end faces of each backing metal 3 into contact with the inner wall surface of the steel pipe 1, and welding is performed by the welding torch 55 of the welding machine 54. Of.

[0010]

However, as described above, such a welding apparatus is premised on a steel pipe having a small cross section with a side length of 1 m or less which cannot be entered by an operator. JP-A-61-279362, JP-A-64-5
In any of the inventions described in Japanese Patent No. 3778, the welding device and the holding / supplying mechanism of the diaphragm are integrally designed,
Since the whole of them travels or moves up and down, it interferes with the holding / supplying mechanism of the diaphragm and the head of the welding machine cannot operate well, and it is difficult to practically install it. Further, providing a backing plate that can expand and contract in the radial direction on each side of the diaphragm as described in JP-A-64-53778 increases the cost of the diaphragm and avoids unnecessary division of the rectangular steel pipe. The result is not in line with the purpose of cost reduction.

The present invention solves the above-mentioned problems and allows the diaphragm to be securely inserted and welded at a predetermined internal position without cutting the rectangular steel pipe unnecessarily beyond the length of the column, and the cost is reduced. And to provide a device.

[0012]

According to the method of fixing a diaphragm in a rectangular steel pipe column of the present invention, a backing plate inserted into the rectangular steel pipe column is fixed at a predetermined position by a fixing device, and one of the fixing devices is attached together with the backing plate. Part of the fixing device that was left after welding the backing metal and the inner surface of the square steel pipe pillar once the main body of the fixing device was pulled out while the fixing mechanism that was the part was left in that position. A certain fixing mechanism is taken out and collected, and then the diaphragm inserted into the rectangular steel tube column is placed on the backing plate by the fixing device, and the fixing mechanism, which is a part of the fixing device together with the diaphragm, remains in that position. After temporarily pulling out the main body of the fixing device and welding the diaphragm and the inner surface of the square steel tube column, the fixing mechanism which is a part of the remaining fixing device is taken out and recovered. The features.

Further, the device for fixing the diaphragm in the prismatic steel tubular column of the present invention is a device for holding two types of fixing mechanisms for holding the diaphragm or the backing metal at the tip and a body for detachably gripping one of the fixing mechanisms. A device for fixing a diaphragm in a rectangular steel pipe column, which comprises a part and a drive mechanism for inserting and pulling out these parts into and from the rectangular steel pipe column. A holding part having a slightly smaller quadrangular outer shape and holding a backing plate on four sides, a scaling mechanism for pulling the backing plate held by the holding part toward and projecting from the inner surface of the rectangular steel pipe column, and a tip part. An opening / closing lever equipped with a high-friction body, and an opening-and-closing mechanism that pushes this high-friction body against the inner surface of a rectangular steel pipe column and retracts it to a size below the space created after the backing metal is fixed. Provided, the diaphragm fixing mechanism, a fitting portion to be fitted by the through-hole of the diaphragm having a center through-hole, and a guide lever which guiding and holding the fitted diaphragm in a central position of the RHS Column inner surface,
An opening / closing mechanism for pressing the tip of the guide lever against the inner surface of the prismatic steel tube column and folding it up to a size equal to or smaller than the through hole at the center of the diaphragm is provided.

[0014]

[Operation] According to the present invention, the fixing mechanism, which is the tip portion of the fixing device, is detachable, and the tip fixing mechanism is left in the rectangular steel pipe column together with the backing plate or the diaphragm, and the main body portion is pulled up. Since the welding work can be carried out in, the diaphragm fixing device and the welding machine do not interfere with each other, and the diaphragm can be fixed without unnecessarily cutting the rectangular steel pipe column.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, a method for fixing a diaphragm according to the present invention will be described with reference to FIGS. For convenience of explanation,
The rectangular steel tube column 1 is set in the vertical direction, and the fixing device is inserted from above to fix the diaphragm. However, the present invention is not limited to this posture, and the rectangular steel tube column 1 is set in the horizontal direction or the diagonal direction. It can be carried in any posture.

FIG. 1 shows the backing metal 3 being conveyed to a predetermined position in the rectangular steel tube column 1 by using the fixing device according to the present invention as the first step. The fixing device of the present invention, which will be described later in detail, includes a fixing mechanism A that holds the backing plate at the tip portion and a fixing mechanism B that holds the diaphragm 2.
And a main body portion C that detachably holds the fixing mechanism A or the fixing mechanism B, and a drive mechanism D that inserts or pulls up these portions into the rectangular steel pipe column.

In the present invention, the four backing plates 3 are locked to the four sides of the holder main body 11 of the fixing mechanism A, and are sandwiched so as to expand and contract in the radial direction. In the state of FIG. Since it is pulled up to the vicinity of the outer edge, it does not hinder the transportation. FIG. 2 shows a state where a predetermined position has been reached as the second stage. At this position, using the expansion / contraction mechanism to be described later, the backing plate 3 is pressed against the inner surface of the rectangular steel tube column 1, and the lower opening / closing mechanism is opened to press the friction shoe 14 against the inner surface of the rectangular steel tube column 1 to fix it with frictional force. The mechanism A is fixed to the rectangular steel pipe column 1. In this state, the fixing mechanism A is opened from the main body portion C by the attaching / detaching mechanism, the fixing mechanism A and the backing plate 3 are left at this position, and the main body portion C is pulled up.

FIG. 3 shows that in the third stage, the welding device 54 is inserted from the upper end of the rectangular steel tube column 1 and the backing metal 3 left by the torch 55 is welded to the inner surface of the rectangular steel tube column 1. In the fourth stage shown in FIG. 4, after the welding is completed, the main body portion C is inserted again, the fixing mechanism A is attached, and the friction shoe 14 below the backing plate 3 is folded, and then the backing plate 3 is left. , The fixing mechanism A is connected to the main body portion C and is recovered.

FIG. 5 shows a fifth step in which the diaphragm 2 is conveyed to a predetermined position in the rectangular steel tube column 1, that is, to the upper portion of the backing plate 3 by using the fixing device according to the present invention. The diaphragm 2 used in the present invention has four corners of a rectangular outer shape slightly smaller than the inner surface of the rectangular steel tube column 1 cut out in a fan shape, and a through hole 2a for fixing operation is provided in the center, and the four sides face upward. The groove that has been opened is processed. That is, since the diaphragm 2 is slightly smaller than the inner surface of the rectangular steel pipe column 1, it does not hinder the transportation.

Further, in the present invention, the diaphragm 2 and the backing plate 3 are separately carried into the rectangular steel tube column 1 and fixed, so that the one described in JP-A-64-53778 shown in FIG. Since such a backing metal holder 3a is not necessary and the diaphragm itself has a simple structure, it can be manufactured at an extremely low cost. In FIG. 6, as the sixth step, the predetermined position is reached,
The diaphragm 2 has just been placed on the backing plate 3 already fixed by welding. In this state, when the opening / closing mechanism to be described later is opened and the guide lever 45 is pressed against the inner surface of the rectangular steel pipe column 1, the fixing mechanism B is guided to the center position of the inner surface of the rectangular steel pipe column 1. In this state, the fixing mechanism B is opened by the attachment / detachment mechanism to fix the fixing mechanism B and the diaphragm 2
Is left at this position and the main body portion C is pulled up.

FIG. 7 shows that in the seventh step, the welding device 54 is inserted again from the upper end of the rectangular steel tube column 1 and the diaphragm 2 left by the torch 55 is welded to the inner surface of the rectangular steel tube column 1. As shown in FIG. 10, which will be described later, the welding here is single-sided welding of a square groove using a backing metal.
In the present invention, it has been described that the posture of the rectangular steel pipe column 1 is arbitrary, but in consideration of the welding process, it is needless to say that this embodiment in which the steel pipe is oriented vertically is most convenient. Absent.

The welding apparatus used in the third and seventh steps may be any articulated welding robot or the like,
In some cases, manual welding by an operator does not depart from the invention. In the eighth step shown in FIG. 8, after the welding is completed, the main body portion C is inserted again to attach the fixing mechanism B, the guide lever 45 below the diaphragm 2 is folded, and then the diaphragm 2 is left to leave the main body portion. The fixing mechanism B is collected by connecting to C.

As described above, in the fixing device of the present invention, the fixing mechanism A or the fixing mechanism B at the tip portion is made detachable, and the fixing mechanism A or the fixing mechanism B together with the backing plate 3 or the diaphragm 2 is provided inside the rectangular steel pipe column 1. It is characterized in that the welding work can be carried out with the main body part B pulled up. Figure 3
As shown in FIG. 7 and FIG. 7, in this state, welding can be performed even by a normal commercially available welding robot.

In the above embodiments, the case where the diaphragm is attached at one place has been described. However, according to the present invention, even when the diaphragm is attached at two or more places, the backing plate is sequentially provided from the back. It can be easily carried out by attaching a diaphragm and and repeating the same procedure. Next, details of the apparatus which is an embodiment of the present invention will be described.

As described above, the fixing device of the present invention is composed of the four fixing mechanisms A, B, C, and D. Of these, the drive mechanism D is a mechanism for moving the main body portion in a linear direction, and in FIG. 1 etc., an example using a rack and a pinion is shown.
Since any known mechanism such as a chain or a wire rope may be used, detailed description will be omitted.

FIG. 9 is a cross-sectional view showing a fixing mechanism A which is a tip portion of the fixing device and a part of the main body portion C which is connected to the fixing mechanism A. The main body portion C is equipped with a detaching mechanism for mounting and releasing the fixing mechanism A or the fixing mechanism B, and an expanding / contracting mechanism for retracting and projecting the backing metal 3 onto the inner surface of the rectangular steel pipe column for the fixing mechanism A, and a high friction body described later. There are two mechanisms, an opening and closing mechanism that opens and closes an opening and closing lever provided at the tip.

In FIG. 9, the inside of the casing 10 is the fixing mechanism A.
The outside of the body side sleeve 33 is the body portion C. There is a locking roller 32 between them, and in this state, the casing 10 and the main body side sleeve 33 are integrated because they are constrained by the outer cylinder 31, but the upper detachable cylinder 34 is operated to remove the outer cylinder 31. When pulled up, the locking roller 32 will
The two can be separated by escaping into the groove on the inner surface. This is an example of the attachment / detachment mechanism, but any other attachment / detachment mechanism may be used.

At the center of the fixing mechanism A, there is a quadrangular holder body 11 corresponding to the shape of the inner surface of the rectangular steel pipe column, and a holding plunger for holding the backing plate 3 on each side of the quadrangular shape.
12 are embedded, and further, each holding plunger 12 has a groove into which the backing plate 3 fits, and a locking plunger 13 for pressing and holding the backing plate 3 is embedded therein.

Both the holding plunger 12 and the locking plunger 13 are operated by the hydraulic pressure sent from the main body portion C, and when the fixing mechanism A is attached to the main body portion C, the valve bodies 30, 20 of the connecting portion are connected. Is opened and hydraulic pressure is transmitted, and when the hydraulic circuit is in communication with the pressure port of the switching valve (not shown), each plunger moves forward, so that the locking plunger 13 strongly holds the backing plate 3 and holds the plunger. 12 presses the backing plate 3 against the inner surface of the rectangular steel pipe column. Further, when the hydraulic circuit is in communication with the tank port, the engaging plunger 13 part is only the force of the attached spring, and the holding force is weakened, and the holding plunger 12 is retracted by the attached spring. Further, when the fixing mechanism A is released from the main body portion C, the valve bodies 20 and 30 are pressed by the springs to close the hydraulic circuit, and the pressure is held on each side.

The hydraulic circuit in the fixing mechanism A further activates the opening / closing piston 19 in the central portion, and when the backing plate 3 is pressed against the inner surface of the rectangular steel pipe pillar, simultaneously pushes down the lower slide block 17 and lowers the lower end. Head block 18
The opening / closing lever 15 which opens and closes around the fulcrum is spread out via the link plate 16, and the high friction body 14 attached to the friction shoe at the tip is pressed against the inner surface of the square steel pipe column. As the high friction body 14, rubber, synthetic resin or other material having a high friction coefficient is suitable.

FIG. 9 shows a state where the left half is under hydraulic pressure and the right half is under hydraulic pressure. FIG. 10 is a sectional view showing a part of the fixing mechanism B and the main body portion C which are also connected to the fixing mechanism, but is shown in a state where the welding of the diaphragm is completed and the main body portion is united again.

The fixing mechanism B includes a fitting portion for fitting the diaphragm 2 and an opening / closing mechanism for opening / closing a guide lever described later. A diaphragm fitting portion 41 into which the diaphragm 2 is fitted is provided in the central portion of the fixing mechanism B, and the diaphragm used in the present invention is provided with a through hole having a shape corresponding to this fitting portion. Further, there is a piston 49 inside, and when this is pushed down by hydraulic pressure, the lower slide block 47 is pushed, and the guide lever 45 is expanded in four directions with the head block 48 as a fulcrum. When the hydraulic pressure is released, the guide lever 45 is collapsed by the action of the spring, the diameter becomes smaller than the diameter of the through hole of the diaphragm 2, and the fixing mechanism B is pulled out upward.

FIG. 10 shows a state where the left half is under hydraulic pressure and the right half is under hydraulic pressure.

[0034]

In the fixing device of the present invention, the fixing mechanism of the tip portion can be attached and detached, and the diaphragm and the diaphragm are left in the rectangular steel pipe column, and the welding operation can be performed with the main body part pulled up. Welding robots can also be used to weld square prisms without unnecessarily cutting, and a diaphragm with a simple structure can be used to securely insert and weld the diaphragm at a prescribed internal position. Steel tube columns can be produced at low cost and high efficiency.

[Brief description of drawings]

FIG. 1 is a partially cut side view showing a first stage of a method of fixing a diaphragm according to an embodiment of the present invention, in which only a column is cut.

FIG. 2 is a partially cut side view showing a second stage of the method of fixing the diaphragm in the embodiment of the present invention, in which only the column is cut.

FIG. 3 is a partially cut side view showing a third stage of the method of fixing the diaphragm in the embodiment of the present invention, in which only the column is cut.

FIG. 4 is a partially cut side view showing a fourth stage of the method of fixing the diaphragm in the embodiment of the present invention, in which only the column is cut.

FIG. 5 is a partially cut side view showing a fifth stage of the method of fixing the diaphragm in the embodiment of the present invention, in which only the column is cut.

FIG. 6 is a partially cut side view showing a sixth stage of the method of fixing the diaphragm in the embodiment of the present invention, in which only the column is cut.

FIG. 7 is a partially cut side view showing a seventh stage of the method of fixing the diaphragm in the embodiment of the present invention, in which only the column is cut.

FIG. 8 is a partially cut side view showing only the column, showing an eighth stage of the method of fixing the diaphragm in the embodiment of the present invention.

FIG. 9 is a cross-sectional view of a tip portion of a fixing device that is an embodiment of the present invention.

FIG. 10 is a sectional view of the tip portion of the fixing device that is the same as the embodiment of the present invention.

FIG. 11 is a side view of a fixing device in the related art.

FIG. 12 is a side view of the fixing device in the same conventional technique.

FIG. 13 is a plan view of a diaphragm according to another conventional technique.

FIG. 14 is a side view of the fixing device in the same conventional technique.

[Explanation of symbols]

1 Square steel pipe column 2 diaphragm 3 backing gold A fixing mechanism B fixing mechanism C body part D drive mechanism 11 Holder body 12 retention plunger 13 Locking plunger 14 High friction body 15 Open / close lever 41 Diaphragm fitting part 51 Guide lever 54 Welding equipment 55 welding torch

Claims (2)

[Claims] 1. A main body of a fixing device, wherein a backing metal inserted into a rectangular steel tube column is fixed at a predetermined position by a fixing device, and a fixing mechanism which is a part of the fixing device is left at that position together with the backing metal. The part was once pulled out, the backing metal and the inner surface of the rectangular steel tube column were welded, and then the fixing mechanism that was a part of the remaining fixing device was taken out and collected, and subsequently inserted into the rectangular steel tube column. The diaphragm is placed on the backing plate by a fixing device, and the main body of the fixing device is temporarily pulled out while leaving the fixing mechanism, which is a part of the fixing device together with the diaphragm, at that position, and the diaphragm and the inner surface of the rectangular steel pipe pillar are A method for fixing a diaphragm in a rectangular steel pipe column, comprising: after welding, the fixing mechanism, which is a part of the fixing device that remains, is taken out and recovered. 2. A two-type fixing mechanism for holding a diaphragm or a backing metal at a tip portion, a main body portion for detachably gripping one of the fixing mechanisms, and these portions are inserted into a rectangular steel pipe column. A device for fixing a diaphragm in a rectangular steel tube column composed of a driving mechanism for pulling and pulling, and the backing plate fixing mechanism has a rectangular outer shape slightly smaller than the inner surface of the rectangular steel tube column and has a backing plate on four sides. A holding unit for holding the, and a expansion and contraction mechanism for pulling the backing metal held by the holding unit with respect to the inner surface of the rectangular steel pipe column and projecting it, an opening and closing lever having a high friction body at the tip end,
It is equipped with an opening and closing mechanism that pushes this high friction body against the inner surface of the square steel tube column and retracts it to a size less than the space created after the backing plate is fixed.The diaphragm fixing mechanism has a diaphragm with a through hole in the center. The fitting part fitted by this through hole, the guide lever for guiding and holding the fitted diaphragm at the center position of the inner surface of the rectangular steel pipe column, and the tip of this guide lever is pressed against the inner surface of the rectangular steel pipe column to push the diaphragm. A device for fixing a diaphragm in a rectangular steel pipe column, comprising: an opening / closing mechanism that folds to a size equal to or smaller than a central through hole.