JPS63212075A - Method and equipment for welding internal diaphragm for steel pipe - Google Patents

Abstract

PURPOSE:To surely, accurately and homogeneously work a beam made of a long-sized steel pipe, etc., by inserting a diaphragm to fit an inwall of the steel pipe into the steel pipe and positioning therein and afterward, controlling a torch of welding equipment so as to move relatively along a fillet part while welding the same part. CONSTITUTION:The long-sized steel pipe 1 is centered and fixed in the longitudinal axial direction to the shaft center of an insertion shaft 8. Next, the diaphragm 6 is subjected to edge-preparation and fitted to a chuck 9 of the tip of the insertion shaft 8. Next, the insertion shaft 8 is shifted in the direction of the shaft center by a mechanism of a rack 13 and a pinion 14 and the diaphragm 6 and an automatic welding machine 10 are inserted into the steel pipe 1. The centering of the insertion shaft 8 is performed by a center positioning device 11 to perform the welding. In this way, the beam made of the long-sized steel pipe, etc., is worked surely, accurately and homogeneously.

Description

Detailed Description of the Invention A33 Purpose of the Invention <Industrial Application Field> The present invention provides a method for forming a joint in a long steel pipe column or a rectangular steel pipe. The present invention relates to a method of welding a plurality of inner diaphragms constituting a type to the inner wall of the steel pipe, and an apparatus therefor.

<Conventional technology> The axial force and bending moment of each member are applied to the pillars and the joints.

Since shearing forces, etc. are concentrated and balanced at the narrow part of the joint, it must be designed to have sufficient strength and rigidity. The joining methods for pillar hojiguchi can be roughly divided into fastener joints that use bolts, high-strength bolts, etc., and welded joints, but structures that use steel pipe columns have closed cross sections, making fastener joints easy. Therefore, a welded joint is adopted in -1, and the configuration is therefore required to be a rigid joint and transmit large bending moments and shear forces. There are two types of construction: factory-welded bracket type and on-site welding.
Currently, the wide bracket type (7) has been adopted due to its reliability.

However, factory-welded bracket-type columns have many welded parts, which increases costs and requires a large number of man-hours to assemble on-site.

<Problems to be Solved by the Invention> Therefore, in the present invention, in view of the existence of the above-mentioned problems in the conventional construction method, when a long steel pipe is used as a column, The pipe is made of long steel pipe or square steel pipe that has been pre-processed to form a column-piercing type with a predetermined number of diaphragms welded inside according to the design or order. The purpose of this project is to develop a method and equipment that process steel pipes reliably, accurately, and uniformly, thereby providing long steel pipes that can economically reduce the number of man-hours needed to construct steel structures on site. .

1. Structure of the Invention <Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention has the following requirements.

(1) Gui 1 with an external shape that matches the cross-sectional inner wall of the steel pipe;
The yaphram is held at right angles to the vermilion longitudinal axis and removably by a chuck provided at the end of the insertion shaft, and after inserting and positioning the yaphram into the steel pipe for a predetermined length, the automatic welding machine is attached to the shaft. The torch is brought close to the corner formed by the inner wall surface of the steel pipe and the flat surface of the diaphragm, and while performing fillet welding, the torch is controlled to move relatively along the turning section, thereby forming a weld between the two. , an inner diaphragm welding method for steel pipes characterized by forming a fillet weld joint.

(2) The inner diaphragm welding method for a steel pipe according to item (1) above, which comprises rotating the steel pipe around its central longitudinal axis during welding of the corner portion.

+31! By groove-processing the peripheral edge of a diaphragm having an external shape that matches the cross-sectional inner wall of the II pipe, holding the diaphragm removably with a chuck provided at the shaft end, and inserting the diaphragm into a predetermined position within the steel pipe, (1) or (1) above, which consists of temporarily welding the corner formed by the inner wall surface of the steel pipe and the diaphragm plane to determine the mutual positional relationship between the two; An inner diaphragm welding method for the steel pipe described in (2).

(4) The inner diaphragm welding method for steel pipes according to the above items (11 to (3)), wherein the temporary attachment of the diaphragm is performed by performing the welding process and the main welding by controlling the same automatic welding device.

(5) For temporary attachment using multiple automatic welding devices, after the diaphragm is temporarily attached to a predetermined position in the longitudinal direction of the steel pipe using the welding device, the device is removed and replaced with the main welding device, and the diaphragm is temporarily attached between the periphery of the diaphragm and the inner wall of the steel pipe. The inner diaphragm welding method for steel pipes according to items fl) to (3) above, which comprises forming a continuous fillet weld joint.

(6) Temporary welding using multiple automatic welding devices involves sequentially tacking multiple diaphragms into predetermined positions in the longitudinal direction of the steel pipe using the welding device, then removing the device and replacing it with the main welding device. For temporary attachment, insert through the window hole of the diaphragm,
The torch of the device is brought close to the corner formed by the diaphragm and the inner wall of the steel pipe, and while fillet welding is performed, a middle fillet weld joint is formed in the same part for each diaphragm. The above (11th to 11th)
3) Inner diaphragm welding method for steel pipes described in section 3).

(7) Automatic welding that is inserted into the steel pipe through the window hole of the existing diaphragm at the corner formed by the diaphragm surface on the side where the joint was formed, the diaphragm plane on the opposite side, and the inner wall surface of the steel pipe. By bringing the torch of the device close to each other and controlling it to move relatively along the same area while performing fillet welding, a fillet weld joint is formed between the two, and both sides are welded to the diaphragm. The inner diaphragm welding method for steel pipes according to the above items (1) to (4), which comprises performing the following steps.

(8) A backing made of a plurality of sheets, corresponding to the beveled part made on the periphery of the diaphragm, movable in each radial direction within the plane of the diaphragm, and whose outer edges have the same shape as the inner wall of the steel pipe in cross section, is attached to the periphery of the back surface of the diaphragm. The backing means are attached, and held at right angles to the longitudinal axis and removably by a chuck provided at the shaft end, and inserted and positioned within the steel pipe by a predetermined length, and the backing means is After pressing the steel pipe against the inner wall surface, the torch of an automatic welding device attached to the shaft is brought close to the corner groove edge formed by the steel pipe inner wall surface and the diaphragm plane, and the same section is welded while performing fillet welding. (1) above, which comprises forming a fillet weld joint between the two by controlling the relative movement along the
An inner diaphragm welding method for steel pipes according to item (6).

(9) While holding a long steel pipe horizontally and rotating it around its longitudinal axis, welding the corner formed by the steel pipe wall and diaphragm, the torch of the automatic welding device is constantly turned on. 2. A method for welding an inner diaphragm in a steel pipe according to items (11 to 8) above, wherein the inner diaphragm is welded in a downward position.

Ql The cross-sectional shape of the steel pipe is circular, square or rectangular in the steel pipe described in items fi+ to (9) above,
・(D) An insertion shaft equipped with a means for fixing a long steel pipe, a chuck that removably holds a diaphragm having an external shape that matches the cross-sectional inner wall of the steel pipe, a remote-controllable automatic welding device, and a center positioning mechanism at the tip. The shaft faces the steel pipe fixing means and can move in the longitudinal direction of the holding means to insert the held diaphragm into the steel pipe while maintaining a right angle to the longitudinal axis of the steel pipe, and also controls its stopping position. and between the insertion shaft and the welding device,
At least diaphragm welding is performed by interposing a means for guiding the welding torch to move relatively along the corner formed by the diaphragm periphery and the inner wall surface of the steel pipe while maintaining a distance within a predetermined interval from the corner. An inner diaphragm welding device for steel pipes, characterized in that a center positioning mechanism is operated to align the centers of the steel pipe and the insertion shaft before processing.

(2) The inner diaphragm welding device for a steel pipe according to item 09 above, comprising a mechanism for operating from the outside of the steel pipe so as to press the backing means provided on the periphery of the back surface of the diaphragm against the inner wall surface of the steel pipe.

ai The means for fixing a long steel pipe is inner diaphragm welding in the steel pipe described in Qll or (2) above, which comprises a mechanism for rotating the steel pipe around its longitudinal axis while the steel pipe is fixed. Device.

α ~ The above-mentioned steel pipe fixing means for holding the longitudinal axis of the long steel pipe in a horizontal direction and an insertion shaft equipped with a diaphragm holding chuck, an automatic welding device, etc. are superimposed on the extension line of the central axis of the steel pipe. An inner diaphragm welding device for steel pipes as set forth in Items αD to Item α above, comprising:

a9 The guiding means of the automatic welding device moves the torch into a circular, square or rectangular shape along the corner formed by the inner wall of the steel pipe and the diaphragm plane as the steel pipe and the welding device rotate relative to each other. The above-mentioned items aυ to 84 consist of controlling to move continuously or discontinuously.
An inner diaphragm welding device for a steel pipe according to item 1.

3 Actions> +11 A long ready-made steel pipe is transferred and placed in place, and three or four points on its circumferential surface are held by gripping members near both ends of the longitudinal axis to center it in the longitudinal axis direction with respect to the insertion axis. and fix it.

(2) A diaphragm having an outer shape that matches the cross-sectional shape of the inner wall of the steel pipe is prepared, and its peripheral edge is beveled. The above diaphragm model is (+) Beveled on only one side.

(ii) Attach a backing member movable in the radial direction to the surface opposite to the beveling side and whose peripheral edge has the shape of the inner wall of the steel pipe in cross section and the shape is substantially the same. A window hole is provided in the center of the diaphragm through which a cam member for operating the backing member can be inserted and removed.

(iii) Beveling both sides of the periphery. This type of diaphragm has a hole in the center that is large enough to allow automatic welding equipment to pass through it.

Attach one of the diaphragms of the above-mentioned type to the chuck provided at the tip of the insertion shaft, and after aligning the center of the steel pipe and the insertion axis, for example, align the insertion shaft with the axis using a rank-binion mechanism. The diaphragm and the insertion in the direction required are at least 1/2 of the length of the steel tube. The moving distance of the insertion shaft is related to the position and dimensional accuracy of the diaphragm of the joint, which is welded into the square steel pipe. It is necessary to provide reliable means for position control.

(3) When the diaphragm occupies a predetermined position on the longitudinal axis of the steel pipe, the center positioning means provided on the insertion shaft is expanded to center the insertion shaft against the inner wall of the steel pipe, and the automatic welding equipment is activated. The center of the guiding means is aligned with that of the steel pipe.

(4) Before carrying out the final welding on both sides or one side inside the corner, both may be temporarily welded. By adding this step, the subsequent regular welding can be carried out stably.

(i) At this time, a plurality of specialized automatic welding devices for temporary welding may be installed at the end of the insertion shaft to temporarily weld each side of the diaphragm to the steel pipe wall at the same time. The guiding mechanism of the welding device can be extremely simplified. However, it is necessary to prepare a separate main welding device and later perform main welding on one or both sides of each diaphragm.

(ii) Temporary welding is performed using the main welding equipment.

In this case, it is necessary to separately prepare a control program for the guiding means so that spot welding or continuous Vti@ contact is performed.

(5) Perform actual welding immediately without performing temporary welding.

At that time, the following steps are also performed.

(i) One-sided main welding is immediately started, and the torch section of the automatic welding device is guided along the corner to form a one-sided welded joint over the entire circumference of the diaphragm. However, when the diaphragm is square or rectangular, each corner may be scalloped.

At this time, the torch portion of the welding device may be moved relatively along the diaphragm periphery by rotating the steel pipe around the longitudinal axis of the long steel pipe, but even in this case, the shape of the steel pipe cross-sectional inner wall If the welding device is square or rectangular, it is essential to install a guiding means between the welding device and the insertion shaft to control the torch section of the welding device to move in and out in the radial direction as the steel pipe rotates. Can not.

In addition, two or more automatic welding devices are installed to enable welding of the entire circumference of the diaphragm without rotating the insertion shaft or steel pipe by 180°.

When rotating the steel pipe, by setting the longitudinal axis of the intermediate pipe horizontally, it is possible to weld the diaphragm with the torch held downward at all times.

(ii) When performing main welding on both sides, bevels must be formed on both sides of the periphery of the diaphragm, and beveled to the extent that another insertion shaft, center positioning device, and automatic welding device can be inserted and removed from the center of the diaphragm. The process is the same as in (i) except that a window hole is used.

In this case, after multiple diaphragms are welded one after another to a predetermined position on the steel pipe by single-sided welding, an automatic welding device installed at the other end of the insertion shaft is inserted into the central hole (window hole) of the welded diaphragm from the opposite end. Insert the diaphragm and form a fillet weld joint between it and the inner wall of the steel pipe, using the existing diaphragm surface as a reference. The length of the insertion shaft is at least longer than the length of the steel pipe.

It may be necessary. This process is almost the same as the main welding process of diaphragms, which is performed after temporarily attaching a plurality of diaphragms to a steel pipe at once.

(iii) When a backing means is provided on the diaphragm, operate the backing plate pressing mechanism provided through the insertion shaft to press the backing plate circumferential surface against the inner wall surface of the steel pipe and press the outer circumferential edge of the diaphragm against the inner wall of the pipe. By eliminating the gap between the welds, the molten metal from the main welding performed inside the back corner is held from the back side, preventing the melt from dripping, and producing a healthy and uniform Uranami bead. It goes without saying that the welding operation described in (i) is also possible in this case.

(6) After welding the diaphragm to a predetermined position within the steel pipe, remove the chuck holding the diaphragm and pull out the insertion shaft including the automatic welding device from the steel pipe.

When welding multiple diaphragms into a steel pipe, prepare a new diaphragm and repeat the steps from step (2) onwards. In this case, the stroke of the insertion shaft is the same as in the previous step.
In other words, the diaphragm is generally welded into the steel pipe in order from the farthest side.

(7) In principle, the objects processed by the method and equipment of the present invention are round steel pipe columns and square steel pipe columns.

The target material is rectangular steel pipes or rectangular cross-section steel pipes.

<Embodiment> FIG. 1 is a schematic side sectional view of an embodiment of an apparatus for implementing the construction method of the present invention, and shows the outline of the apparatus for temporarily attaching a diaphragm without backing means.

In the figure, 1 is a long, large-diameter rectangular steel pipe, and fixed cylinders 4, 4', etc. of a hydraulic mechanism are installed on the four sides of the side wall 3 of a vertical cockpit-like vertical hole 2, respectively. The four sides are held by the tips of plungers 5, 5', which reciprocate in the horizontal direction, and are fixed in the vertical direction at the center of the vertical hole 2. Moreover, the downward position is regulated by the bottom surface of the vertical hole 2. The steel pipe is housed in the shaft 2 by moving an insertion shaft mechanism (to be described later) from the upper part of the shaft 2 and suspending it by a winch or the like. Reference numeral 6 denotes a diaphragm having an outer shape that matches the cross-sectional inner wall shape of the square steel pipe 1, and the outer periphery of its four edges is beveled.

In addition, when processing a round steel pipe, it is sufficient to install three sets of each fixed cylinder/plunger.

When forming a fillet weld joint with only one side welding, the beveling described above is applied only to the upper side edge in the figure, but when fixing the diaphragm 6 by double-sided welding,
Bevel the bottom surface (see Figure 5).

8 is a chuck 9 of the diaphragm 6, an automatic welding device IO
and an insertion shaft equipped with a center positioning device 11 etc. at one end, whose longitudinal axis can be roughly aligned with the center extension line of the square steel pipe 1 fixed in the vertical hole 2, removed or moved, Further, when the centers of the two are aligned, the steel pipe 1 is slidably supported by a bearing member 12 near the other end so that the diaphragm 6 and the like can be moved to a predetermined dimensional position on the longitudinal axis of the steel pipe 1 by moving in the axial direction.

13 is a rack provided along the insertion shaft 8, and the pinion 1
4, the rack 13 and the insertion shaft 8 are moved in the axial direction by the pinion 14, which is mounted on the bearing member 12 and driven by, for example, a pulse motor 15. Identify the position to occupy.

In the automatic welding equipment WIO, when only temporarily attaching the diaphragm 6, a plurality of torches are provided in the radial direction to the insertion shaft 8, the insertion shaft 8 is inserted into the steel pipe l for a predetermined length, and the diaphragm 6 is temporarily attached. After the mounting position is determined, the diaphragm 6 is operated at once to temporarily weld the diaphragm 6 to the inner wall surface of the steel pipe 1 at multiple locations around its circumference.

However, for tack welding, if you move the center positioning device 11 before the process to center the steel pipe 1 and the insertion shaft 8, you can center the welding torch and the welded part as desired and evenly. can do.

Note that it is preferable to use carbon dioxide gas welding, argon gas welding, laser beam, etc. as the automatic welding machine. The above-mentioned center positioning device 11 detects that when inserting the insertion shaft 8 into the steel pipe 1 for a long time, if the centers of the shaft 8 and the inner wall surface of the steel pipe do not match, the quality of the finish of the welded joint in the subsequent automatic welding of the diaphragm will be affected. Therefore, it is operated before the welding process to center the steel pipe/inserted shaft pipe, and is always equipped in each of the apparatuses of the embodiments described below. A schematic enlarged side view is shown in FIG. 2. In the figure, l is a long large rectangular steel pipe, 8 is an insertion shaft,
Reference numeral 11 denotes a center positioning device, and its configuration is such that an air cylinder 16 fixed to the shaft 8 and a plunger support a ring member 17 that is slidable in the longitudinal direction of the insertion shaft. The other end of the lever 18, which can come into contact with the inner wall and is pivotally supported by the insertion shaft 8 at an intermediate position, is rotatably supported via a rod 19. Therefore, the air cylinder 16 is operated to remove the ring member 1.
When the lever 7 is lowered and slid, the tip of the lever 18 spreads evenly in the diametrical direction, the open end comes into contact with the inner wall surface of the steel pipe, and the center of the shaft 8 coincides with the center of the steel pipe 1. When the ring member 17 is raised, the end of the lever 18 is pinched in the diametrical direction, opening the insertion shaft 8 to the steel pipe 1 and making it freely movable. Also in this case, if the target steel pipe has a round cross section, it is sufficient to provide three sets of levers 18.

FIG. 3 shows a schematic cross-sectional view of a device for tacking with a backing means, and in this case, for the device shown in FIG. It is necessary to attach a mechanism to the insertion shaft 8. Therefore, a window hole 19 is bored in the center of the diaphragm 6, and a window hole 19 is formed in the center of the diaphragm 6.
al, (A backing mechanism is provided on the back side as shown in enlarged view in bl.) Figure 4 (al is a partially enlarged view of Figure 3, showing the diaphragm 6 set in the steel pipe 1. A cross-sectional view is shown, and FIG. 4 (BL is a back view thereof, in which 1 is a square steel pipe, 6 is a diaphragm, 8 is an insertion shaft, 9 is a chuck, and 19 is a window hole provided in the diaphragm 6. Then, the cam member 20 is operated through the loop 19 to push out the backing plate 21 in the radial direction.

One backing plate 21 is provided on the lower surface of each of the four sides of the diaphragm 6 and is held slidably in the radial direction with respect to the center of the diaphragm 6, and the cam member 20 that abuts the rear edge is moved in the axial direction of the insertion shaft 8. The outer edge of the diaphragm 60 is pressed into contact with the inner wall of the steel pipe, closing the gap between the periphery of the diaphragm 60 and the inner wall of the steel pipe. This is to hold and prevent melting from falling off and to generate a healthy and uniform Uranami bead. The upper member 20 is provided with a plurality of split grooves 22, and when the diaphragm 6 is held by the chuck 9, the rear edge of the backing plate 21 is passed through the split grooves 22 and stopped.

However, since the device shown in Figure 3 only performs welding to temporarily attach the diaphragm, the welding device is the 1st! This is similar to the case shown in I, and there is no need to equip a complicated guidance device. Further, in the same figure, 23 is a vertical rod for operating the cam member 20, which is provided in the center shaft hole of the insertion shaft 8 concentrically with the same shaft, and its upper end is connected to the longitudinal direction of the same shaft by an air cylinder 24 attached to the insertion shaft 8. The shaft 8 is connected to a plunger that operates on
The vertical rod 23 is moved by the air cylinder 25 attached to the
It is connected to an arm 26 that swings about its longitudinal axis. As a result, the cam member 20 swings to the position shown in FIG. Can be done.

FIG. 5 shows a schematic side sectional view of a single-sided main welding device without backing means, most of the mechanism of which is as explained in the embodiment shown in FIG. Components with the same reference numerals as those used in the above are substantially the same members.

The above-mentioned single-sided main welding can be performed by using the device shown in the first diagram in advance to weld the diaphragm 6, or by inputting a program for tack welding into a guidance device attached to this device, and even if the tack welding is performed after welding. Alternatively, main welding may be performed immediately.

The feature of this welding device is that a control mechanism 26 is interposed between the insertion shaft 8 and the automatic welding device 10 to guide the torch 360° along the corner formed by the diaphragm periphery and the inner wall surface of the steel pipe. It is at the point.

For this reason, space is required and it may be difficult to install multiple automatic welding devices unless the inside cross-section of the steel pipe is considerably large, but if possible, prepare multiple automatic welding devices to make it more efficient Can be welded. The details of the guiding means 26 are as shown in FIGS. 6(a) and 6(a).
An annular member 28 pivotably pivoted around 7, the member 2
The automatic welding machine 10 is supported on the machine and is provided so as to be movable back and forth (in the direction of the arrow) along a main shaft 29 orthogonal to the support shaft 27, and a part of the swing ring member 28 that is apart from the support shaft 27 is inserted. It is connected to a part of the circumferential surface of the shaft 8 by an arm 30 that can be controlled to expand and contract.

Further, the insertion shaft 8 rotates 360 degrees around its longitudinal axis while the automatic welding machine 10 remains attached. However, the chuck 9 of the diaphragm 6 must be kept from rotating.

Note that when rotating the steel pipe side, it is not necessary to rotate the shaft 8.

Thus, the trajectory of the torch of the automatic welding machine 10 is determined by three-dimensional control of the rotation angle around the longitudinal axis of the insertion shaft 8, the change in tα by controlling the expansion and contraction of the arm 30, and the forward and backward movement along the main shaft 29. , Fig. 6), it follows the inner wall shape of the square steel pipe, that is, the outer shape of the diaphragm. If the cross section of the steel pipe is round, the position of the welding machine 10 only needs to be controlled by the rotation angle around the longitudinal axis of the shaft 8; if the cross section is rectangular, the control program may be slightly different from that of a square one. Must be established.

Stroke and main axis 29 of the aforementioned telescoping arm 30
It is relatively easy to control the moving distance of the welding machine along the rotation angle of the insertion shaft 8 by using a lead screw rotated by a pulse motor and a nut screwed into the lead screw. .

In addition, actuators using fluid can be built into the annular member and arm 30 to enable remote control, and in some cases, each may be controlled electrically and fluidly.

Of course, the above control can be applied to round diaphragms, square and rectangular diaphragms, and their diameters by simply changing the program.

Furthermore, it is extremely easy to change the program and use the same welding machine to perform temporary welding of the diaphragm before main welding. In this way, a special device is not required for temporarily attaching the diaphragm as shown in the first figure, but the program and other mechanisms inevitably become somewhat complicated.

The automatic welding machine 10 typically performs single-sided welding using carbon dioxide arc welding, argon gas arc welding, laser beam welding, or the like, but is not necessarily limited thereto.

Referring again to FIG. 5, in order to rotate the automatic welding machine 10 by 360° around the longitudinal axis of the insertion shaft 8, the shaft 8' to which the welding machine 10 is attached is a worm that is coaxial with the longitudinal axis of the insertion shaft 8. It is driven by a wheel 31 and a worm 32 that meshes with the wheel 31. In this way, a single-sided fillet weld joint is formed between the groove portion 7 of the entire periphery of the diaphragm 6 (however, the corner portions may be excluded) and the inner wall of the steel pipe, and the diaphragm is fixed at a predetermined position in the longitudinal axis direction of the steel pipe. A single piece can be welded and fixed.

Note that when the diaphragm 6 has already been temporarily attached, a sensor for sensing the position of the diaphragm may be provided in place of the diaphragm holding chuck 9 provided at the end of the insertion shaft.

FIG. 7 is a cross-sectional view of a square steel pipe 1 in which a plurality of diaphragms 6 are fully welded on both sides.
Grooves F and 7' are provided on the periphery of the lower surface, and a window hole 19 is provided in the center portion, which is large enough to allow insertion of at least an automatic welding device.
′ is drilled, and each diaphragm 6 is welded on one side one by one from the bottom upwards to fix it to the steel pipe, and an automatic welding machine is inserted into the corner of the back side of the diaphragm from the opposite side through each window hole 19′. A welded joint is also formed at the corner of the diaphragm on the opposite side.

FIG. 8 shows a schematic side sectional view of the main welding device with backing means; each mechanism and member assembled in the device is as follows:
Everything has been explained so I won't reproduce it. In this case as well, the tack welding process may be input into the program of the guiding means and the diaphragm 6 may be tack-attached in advance and then the main welding may be performed, or the main welding may be performed immediately. In addition, when using the device shown in Figure 8 as a step after welding a plurality of diaphragms 6, a window hole at least large enough to allow the automatic welding device to pass through the center of the diaphragm 6 should be provided, as in Figure 7. It is necessary to drill 19'.

FIG. 8 also shows the process.

The device which fixes the longitudinal axis of the steel pipe 1 in a horizontal position and rotates it around its central axis, and which performs diaphragm welding with the torch of the automatic welding machine 10 always facing downward, is 5, 7 and 8 can be implemented with only horizontal installation and some modification of the program for the guiding means of the welding device.

Since the effects of the invention are as described above, according to the present invention, a long steel pipe,
For example, when a round steel pipe column, a square steel pipe through-hole column, a rectangular steel pipe column, or a rectangular steel pipe is unloaded from storage, the preliminary machining of the corresponding column and joint is performed reliably, precisely, and uniformly in the factory. Since it can be carried out efficiently and economically, if the steel pipe according to the present invention is used as a through-pillar or a bolt to construct a pillar-piercing type of bolt,
It is possible to reduce the number of man-hours required to construct a steel structure with multiple floors on-site, shorten the number of construction days, improve economic efficiency, and form a highly rigid joint.

[Brief explanation of the drawing]

Figures 1 to 6 and Figure 8 are schematic diagrams of each embodiment of the apparatus for carrying out the construction method of the present invention.
The figure shows a side sectional view of the welding device for diaphragm tacking without backing means, Figure 2 is an enlarged side sectional view of the insertion shaft center positioning device, and Figure 3 shows the side of the device for tacking the diaphragm with backing means. The sectional view, Figure 4 ta+ is a partially enlarged view of Figure 3, Figure 4 (bl
5 is a side sectional view of a single-sided main welding device without backing means, FIG. A side cross-sectional view of the welding equipment is shown, and FIG. 7 is a partial side cross-sectional view of a long large-sized steel pipe in which the construction method of the present invention was implemented. 1...Long large-diameter steel pipe 2... Vertical hole 3... Side wall 4.4' and 16, 24.25... Cylinder 5.
5'... Plunger 6... Diaphragm 7... Groove section 8.8'... Insertion shaft 9... Chuck 10... Automatic welding machine 11... Center positioning device 12... Insertion shaft bearing member 13...Rack 14...Pinion 15...Pulse motor 17...1aL18...Lever 19.19'...Window hole 20...Cam means 21...Backing Plate 22...Groove 23...Vertical rod 26...Guiding means 27...Spindle 2...Annular member 29...Main shaft 30...Arm 31...Worm wheel 32... ...Warm Agent Patent Attorney Ei 1) Hiroshi - Figure 1 Figure 3 Figure 5r1! J Figure 4 (a) (b) Figure 6 (a) (b)

Claims (1)

[Scope of Claims] 1. A diaphragm having an outer shape that matches the cross-sectional inner wall of the steel pipe is inserted into the steel pipe for a predetermined length by being held at right angles to the longitudinal axis and removably by a chuck provided at the end of the insertion shaft. After inserting and positioning it, bring the torch of an automatic welding device attached to the shaft close to the corner formed by the inner wall surface of the steel pipe and the plane of the diaphragm, and while welding the fillet,
An inner diaphragm welding method for steel pipes, characterized in that a fillet weld joint is formed between the two by controlling the inner diaphragm to move relatively along the same part. 2. The inner diaphragm welding method for a steel pipe according to claim 1, which comprises rotating the steel pipe around its central longitudinal axis during welding of the corner portion. 3. By groove-processing the peripheral edge of a diaphragm having an external shape that matches the cross-sectional inner wall of the steel pipe, holding this removably with a chuck provided at the shaft end, and inserting it into the steel pipe to a predetermined position. , before the corner portion formed by the inner wall surface of the steel pipe and the diaphragm plane is actually welded, tack welding is performed between the two to determine their mutual positional relationship. The inner diaphragm welding method for steel pipes according to item 2. 4. The inner diaphragm welding method for steel pipes according to claims 1 to 3, which comprises performing the diaphragm tack welding step and the main welding by controlling the same automatic welding device. 5. After the diaphragm is temporarily attached to a predetermined position in the longitudinal direction of the steel pipe using a tack welding device equipped with multiple automatic welding devices, the device is removed and replaced with the main welding device, and a continuous welding device is installed between the periphery of the diaphragm and the inner wall of the steel pipe. 4. A method of welding an inner diaphragm in a steel pipe according to any one of claims 1 to 3, which comprises forming a fillet welded joint. 6. After sequentially tacking multiple diaphragms at predetermined positions in the longitudinal direction of the steel pipe using a tack welding device equipped with multiple automatic welding devices, the device is removed and replaced with the present welding device,
This is inserted through the window hole of the temporarily attached diaphragm, and the torch of the device is brought close to the corner formed by the diaphragm and the inner wall of the steel pipe, and the torch is moved relatively along the corner while performing fillet welding. 4. A method of welding inner diaphragms in steel pipes according to any one of claims 1 to 3, wherein the welding of inner diaphragms in steel pipes is performed for each diaphragm by controlling and forming a fillet weld joint between the two diaphragms. 7. Automatic welding device inserted into the steel pipe through the window hole of the existing diaphragm into the corner formed by the diaphragm surface on the side where the single-sided fillet welded joint was formed, the diaphragm plane on the opposite side, and the steel pipe inner wall surface. A fillet weld joint is formed between the two by bringing the torches close to each other and controlling the relative movement of the torches along the same area while performing fillet welding, thereby performing double-sided welding to the diaphragm. A method for welding an inner diaphragm in a steel pipe according to any one of claims 1 to 4, which comprises performing the welding process on an inner diaphragm in a steel pipe. 8. Corresponding to the grooved part on the periphery of the diaphragm,
A backing means movable in each radial direction within the plane of the diaphragm is attached to the periphery of the back surface of the diaphragm, and is made up of a plurality of sheets whose outer edges have the same shape as the cross-sectional inner wall of the steel pipe. an automatic welding device that is held perpendicular to the shaft and removably inserted into the steel pipe for a predetermined length and positioned, and that is attached to the shaft after pressing the backing means against the inner wall surface of the steel pipe; The torch is brought close to the edge of the fillet groove formed by the inner wall surface of the steel pipe and the plane of the diaphragm, and the torch is controlled to move relatively along the groove edge while welding the fillet, thereby creating a weld between the two. A method of welding an inner diaphragm in a steel pipe according to any one of claims 1 to 6, which comprises forming a fillet welded joint. 9. Hold a long steel pipe horizontally, rotate it around its longitudinal axis, and while welding the corner formed by the steel pipe wall and diaphragm, the torch of the automatic welding device is constantly turned on. Claim 1 configured to maintain the downward position.
9. An inner diaphragm welding method for steel pipes according to item 8. 10. The inner diaphragm welding method for steel pipes according to claims 1 to 9, wherein the cross-sectional shape of the steel pipe is circular, square, or rectangular. 11. An insertion shaft having a means for fixing a long steel pipe, a chuck for removably holding a diaphragm having an external shape that matches the cross-sectional inner wall of the steel pipe, an automatic welding device that can be remotely controlled, and a center positioning mechanism at its tip. The shaft is opposed to the steel pipe fixing means, and can be moved in the longitudinal direction to insert the held diaphragm into the steel pipe while keeping it perpendicular to the longitudinal axis of the steel pipe, and also controls its stopping position. In addition, between the insertion shaft and the welding device, a welding torch is inserted along the corner formed by the periphery of the diaphragm and the inner wall surface of the steel pipe, keeping a distance within a predetermined distance from the corner. An inner diaphragm in a steel pipe, characterized in that a means for inducing relative movement is interposed, and a center positioning mechanism is operated at least before the diaphragm welding process to align the centers of the steel pipe and the insertion shaft. Welding equipment. 12. The inner diaphragm welding device for a steel pipe according to claim 11, comprising a mechanism that is operated from outside the steel pipe so as to press the backing means provided on the periphery of the back surface of the diaphragm against the inner wall surface of the steel pipe. 13. The inner part of the steel pipe according to claim 11 or 12, wherein the means for fixing the long steel pipe includes a mechanism for rotating the steel pipe around its longitudinal axis while the steel pipe is fixed. Diaphragm welding equipment. 14. An insertion shaft equipped with a diaphragm holding chuck automatic welding device, etc. is provided overlapping the steel pipe fixing means for holding the longitudinal axis of the long steel pipe in a horizontal direction and on an extension of the central axis of the steel pipe. An inner diaphragm welding device for steel pipes according to any one of claims 11 to 13, comprising: 15. The guiding means of the automatic welding device is configured to move the torch into a circular, square or rectangular shape along the corner formed by the inner wall of the steel pipe and the diaphragm plane as the steel pipe and the welding device rotate relative to each other. 15. The inner diaphragm welding apparatus for steel pipes according to claim 11, wherein the inner diaphragm welding apparatus for steel pipes is controlled to move continuously or discontinuously.