JP2003307032A - Connection method for columnar steel pipe and fixture for fixing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection method for a columnar steel pipe which can reduce labor and cost for fabricating the columnar steel pipe, which does neither leave traces after a fixture for fixing removed nor impair beautiful appearance, and further, nor bring a thermal deformation of the pipe when attaching the fixture for fixing. <P>SOLUTION: Ring bodies 6 having a multi-split structure are detachably but fixedly fitted to the outer peripheries of the mutually opposite ends of the upper and lower column steel pipes 2 by high strength bolts 9. A plurality of vertically extending vertical plates 7 attached to the upper and lower ring bodies are mutually connected by a connection plate 3 to hold and coaxially fix the upper and lower columnar steel pipes in the butt condition of the respective ends. In this state, the mutual butt ends of the upper and lower pipes are welded together. After that, the high strength bolts are unscrewed, and the ring bodies 6 are respectively removed from the upper and lower columnar steel pipes 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining column steel pipes and a jig for fixing the column steel pipes directly used when carrying out this method.

[0002]

2. Description of the Related Art Conventionally, when field steel pipes are welded on site, a plurality of erection pieces are welded to the outer circumferences of the ends of the upper and lower column steel pipes at intervals in the circumferential direction. They are connected by sandwiching them from both sides with connecting plates and tightening them with high-strength bolts, which allows the upper and lower pillar steel pipes to be held coaxially and in a state where their ends are butted against each other. We were performing on-site welding between the butt joints. Then, after welding, the erection piece was cut and removed from the pillar steel pipe.

[0003]

The above-described conventional method for joining column steel pipes using the erection piece has the following problems. 1) It is necessary to weld the erection piece to the column steel pipe in a steel frame factory or the like, which requires extra labor and cost. 2) Even after cutting the erection piece, a trace of several tens of millimeters remains, so if the outer periphery of the pillar steel pipe is exposed as it is without finishing, the aesthetic appearance is impaired. 3) In order to make the cut marks of the erection piece inconspicuous, it may be finished smoothly with a grinder or the like, but in that case, it requires a great deal of work and cost, which is uneconomical. 4) When the plate thickness of the pillar steel pipe is thin, when the erection piece is welded, the pillar steel pipe itself may be deformed by welding heat.

In view of the above circumstances, according to the present invention, it is possible to reduce the labor and cost when manufacturing a pillar steel pipe, leave no trace even after the fixing jig is removed, and do not impair the aesthetics of the pillar steel pipe. The problem is that thermal deformation of the column steel pipe does not occur when the fixing jig is attached.

[0005]

In order to solve the above-mentioned problems, the following means were adopted in the present invention. That is,
In the method for joining pillar steel pipes according to claim 1, the ring bodies having a multi-divided structure are detachably fitted and fixed to the outer peripheries of the upper and lower pillar steel pipes facing each other, and attached to these upper and lower ring bodies. By connecting a plurality of vertical plates extending in the vertical direction by connecting plates, respectively, the upper and lower column steel pipes are held and fixed in a coaxial state with their ends abutting each other, and in this state, the upper and lower column steel pipes are held. It is characterized in that the abutting portions of the end portions of are welded together, and then the ring bodies are removed from the upper and lower column steel pipes, respectively.

[0006] In such a structure, a ring body having a multi-divided structure is detachably fitted and fixed to a pillar steel pipe rather than being welded, and a plurality of vertical plates attached to the ring body are used to make the upper and lower pillar steel pipes relative to each other. In this state, the upper and lower column steel pipes are welded together, and then the ring body is removed from the column steel pipe, so there is no need to weld the erection piece when creating a column steel pipe like the conventional one. There is no need to cut the erection piece after welding the steel pipe.

According to a second aspect of the present invention, there is provided a jig for fixing a pillar steel pipe, which is fitted and fixed to outer circumferences of end portions of the upper and lower pillar steel pipes, respectively. A jig for fixing a column steel pipe for holding and fixing the ends in abutting state, which is a multi-divided structure and is attached and detached to the outer periphery of the end of the column steel pipe by connecting adjacent individual ring body constituent members. A ring body that is fitted and fixed as much as possible, and a vertical plate that is provided on the outer circumference of the ring body along the circumferential direction at intervals and along a plane that includes the axis of the ring body and that is connected to the connecting plate. It is characterized by comprising and. In such a configuration, the ring body constituting member is arranged so as to surround the pillar steel pipe, and in this state, the adjacent ring body constituting members are connected to each other, so that the ring body is fitted and fixed to the pillar steel pipe. Then, by connecting the vertical plates corresponding to each other attached to the upper and lower ring bodies by the connecting plate, the upper and lower pillar steel pipes are coaxially held and fixed in a state where their ends are abutted, in this state, Weld the butt joints of the ends of the upper and lower column steel pipes. After the welding work is completed, the ring plate can be removed from the pillar steel pipe by removing the connection plate and then disconnecting the ring body constituent members without performing cutting work or the like.

According to a third aspect of the present invention, there is provided a jig for fixing a pillar steel pipe according to the second aspect, wherein the ring body constituting member constituting the ring body is an arc plate abutting against an outer circumference of the column steel pipe. Section, upper and lower ring-shaped flat plate portions mounted above and below the circular arc plate portion, and standing plate portions mounted on the side ends of the circular arc plate portion, and the ring is formed by connecting the standing plate portions. The feature is that the body is fitted and fixed to the outer circumference of the pillar steel pipe. With such a structure, it is possible to obtain a ring body constituent member having a proper structure and a proper rigidity.

According to a fourth aspect of the present invention, there is provided a jig for fixing a pillar steel pipe according to the second or third aspect, wherein the vertical plate is provided on one side of the inner circumferential surface of the pillar steel pipe and on the other side of the inner circumferential surface opposite thereto. It is characterized in that it is provided at a position corresponding to the vertical rib reaching up to. In such a configuration, when the vertical plates provided on the upper and lower ring bodies are connected through the connecting plate to align the upper and lower column steel pipes, an excessive load is applied to the column steel pipes,
There is a vertical rib at a position corresponding to the vertical plate of the pillar steel pipe, and the pillar steel pipe is reinforced by this vertical rib, and the vertical rib and the vertical plate of the ring body are in a position corresponding to each other. The column steel pipe is not largely deformed by the load of.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing an operation of joining upper and lower column steel pipes using a jig for fixing a column steel pipe showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. , FIG. 3 is a view on arrow III of FIG. 1, and FIG. 4 is IV of FIG.
It is an enlarged view of a circle part.

1 and 2, reference numeral 1 indicates a jig for fixing a column steel pipe (hereinafter, simply referred to as a fixing jig). These fixing jigs 1 are fitted and fixed to the outer circumferences of the ends of the upper and lower pillar steel pipes 2, respectively, and the upper and lower pillar steel pipes 2 are coaxial with each other and the end portions 2a of the upper and lower pillar steel pipes 2 are butted to each other via a connecting plate 3. It is held and fixed at (see FIG. 3).

The fixing jig 1 includes a ring body 6 having a multi-divided structure (a four-divided structure in this embodiment), and a ring body 6 which is spaced from each other along the circumferential direction on the outer circumference of the ring body 6. The vertical plate 7 is provided along a plane including the axis of 6 and is connected to the connecting plate 3.

The ring member 5 comprises a circular arc plate portion 5a which is brought into contact with the outer periphery of the column steel pipe 2 during assembly, and upper and lower ring-shaped flat plate portions 5b and 5c which are attached above and below the circular arc plate portion 5a, respectively. The standing plate portion 5d is attached to the side end of the arc plate portion. Then, the standing plate portions 5d are connected to each other by the high-strength bolts 9 inserted into the holes 5dd formed in the standing plate portions 5d, so that adjacent individual ring body constituent members 5 are connected to each other as a whole. It has a ring shape and is detachably fitted and fixed to a predetermined position on the outer circumference of the upper and lower column steel pipes 2. Therefore, the inner diameter of the ring body 6 is set to be slightly smaller than the outer diameter of the column steel pipe 2 in advance so as to have a tightening margin.

The vertical plate 7 is welded to the central portion of the ring body constituting member 5 in the left-right direction at the edges thereof to the circular arc plate portion 5a, the upper and lower ring-shaped flat plate portions 5b and 5c, and the standing plate portion 5d. It is fixed (see Figure 5). The width of the vertical plate 7 is set to be larger than the width of the ring-shaped flat plate portions 5b and 5c and the standing plate portion 5d of the ring body 6 so as to project outward from the ring body 6. Further, holes are formed in the vertical plate 7 so that the high-strength bolts 10 for connecting the vertical plate members 7 through the connecting plate 3 can be inserted. Further, as described above, since the vertical plate 7 is provided in the center portion in the left-right direction of the ring body constituent member 5, the connecting portion (the standing plate portion 5d) of the ring body constituent members 5 and the vertical plate 7 are circumferentially arranged. At equal intervals (in this embodiment, with a central angle of 45 degrees)
Will be placed.

On the other hand, a reinforcing ring plate 12 is attached to the inner circumference of the upper end of the lower column steel pipe 2 by welding, and this ring plate 12 is used when the upper and lower column steel pipes 2 are welded. A ring-shaped backing metal 13 is attached so as to project upward. That is, the ring-shaped backing metal 13 is attached at a position facing the welded portions W of the upper and lower column steel pipes 2 (see FIG. 4).

Further, at the inner periphery of the lower end of the upper column steel pipe 2, two vertical ribs 14 are provided at their central portions so as to reach from one side of the inner peripheral face of the column steel pipe 2 to the other side of the inner peripheral face opposite thereto. They are joined and attached by an appropriate fixing means such as welding so as to form a cross shape in a top view. A ring plate 15 for reinforcement is attached to the upper side of the vertical ribs 14 on the inner peripheral surface of the column steel pipe 2 by appropriate fixing means such as welding.

Next, a method of joining the upper and lower column steel pipes using the fixing jig having the above construction will be described. First, the fixing jig 1 is attached to each of predetermined end portions of the upper and lower column steel pipes 2. Specifically, the ring body constituent member 5 is connected to the pillar steel pipe 2
Are arranged along their outer peripheral surfaces so as to enclose the same, and in this state, the high-strength bolts 9 are inserted into the holes 5dd of the overlapping standing plate portions 5d of the adjacent ring-shaped component members 5 and screwed into the high-strength bolts 9. By sandwiching the standing plate portions 5d with the fitted nuts, the adjacent ring-shaped component members 5 are connected to each other, whereby the ring bodies 6 are fitted and fixed to the upper and lower pillar steel pipes 2 respectively (FIG. 4). reference).

At this time, in the ring body 6 fitted and fixed to the upper pillar steel pipe 2, the vertical plate 7 is the vertical rib 14 of the pillar steel pipe 2.
Are fitted and fixed in a state of being positioned so as to come to a position corresponding to, that is, so as to be located on the same plane as the vertical rib 14.

Next, a plurality of vertically extending vertical plates 7 attached to the upper and lower ring bodies 6 are sandwiched by the connecting plates 3 from both sides, and the overlapping connecting plates 3 and the vertical plates 7 are preformed and matched. After the high-strength bolt 10 is inserted into the bolt insertion hole, and the upper and lower column steel pipes 2 are accurately positioned so that they are coaxial with each other and their ends abut against each other, the high-strength bolt 10 is screwed to the high-strength bolt 10. The connecting plate 3 and the like are strongly sandwiched between the nut and the nut, and thereby the upper and lower column steel pipes 2 are held and fixed in a state where they are relatively positioned. In this state, the abutting portions of the upper and lower column steel pipes 2 are welded to each other.

When the welding of the upper and lower column steel pipes 2 is completed, the high-strength bolt 10 and the corresponding nut are unscrewed, and the connecting plate 3 connecting the upper and lower vertical plates 7 is connected. Remove. Then, the high-strength bolt 9 and the corresponding nut are unscrewed, the ring body 6 is disassembled into individual ring body constituent members 5, and the pillar steel pipe 2 is removed.

According to the above-described joining method of the column steel pipes, the fixing jig 1 is not welded but the outer peripheral surface of the column steel pipe 2 and the ring body 6.
Are removably fitted and fixed to the outer periphery of the end of the pillar steel pipe 2 by frictional force with the inner peripheral surface of the pillar steel pipe 2, and the upper and lower pillar steel pipes 2 are vertically aligned with each other by the fixing jig 1. Since the column steel pipe is welded and then the fixing jig 1 is removed from the column steel pipe 6, it is not necessary to weld the erection piece when creating the conventional column steel pipe 2, and the labor is saved accordingly.
Cost can be reduced. Further, when the fixing jig 1 is attached to the outer circumference of the pillar steel pipe 2, the fitting jig 1 is fitted and fixed by frictional force between the outer peripheral surface of the pillar steel pipe 2 and the inner peripheral surface of the ring body 6 without using welding. The steel pipe 2 will not be thermally deformed.

Further, after welding, without cutting the erection piece, it is possible to remove it from the pillar steel pipe 2 by simply loosening the high-strength bolt 9 and the like and disassembling the ring body 6 into individual ring body constituting members 5. For this reason, after the fixing jig 1 is removed, no trace is left on the pillar steel pipe 2, and even if the outer peripheral surface of the pillar steel pipe is exposed, the appearance is not impaired.

Furthermore, since the fixing jig 1 is simply fitted and fixed to the pillar steel pipe 2 by the high-strength bolt 9, it can be diverted many times for each welding of the pillar steel pipe 2, and in this respect as well. Cost can be reduced.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and other configurations can be adopted without departing from the spirit of the present invention. For example, in the above-described embodiment, the vertical plate 7 has a rectangular shape in a side view, but the vertical plate 7 is not limited to this, and as shown in FIG. 6, a column collapse or misalignment adjusting mechanism can be incorporated. Vertical side plate 1 with a square shape
7 may be used. Further, in the above embodiment,
Although the ring body 6 has a four-divided structure, it is not limited to this and may have a three-divided structure or a six-divided structure. Further, in the above embodiment, the ring body 6 is provided with four vertical plates 7,
The number of the vertical plates 7 is not limited to four and may be three or five or more, for example.

[0025]

As described above, according to the present invention,
Since the fixing jig is detachably fitted and fixed to the outer periphery of the end of the column steel pipe by the frictional force between the outer peripheral surface of the column steel pipe and the inner peripheral surface of the ring body, not by welding, There is no need to attach the erection piece by welding. For this reason, it is possible to save time and labor for manufacturing the pillar steel pipe and reduce the cost accordingly. Further, when the fixing jig is attached, the column steel pipe is not thermally deformed, and even after the fixing jig is removed, no damage is left and the appearance is not deteriorated. Further, the fixing jig can be diverted many times each time the column steel pipe is welded, and the cost can be reduced in this respect as well.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a method of joining column steel pipes using a jig for fixing a column steel pipe according to an embodiment of the present invention. It is a front view of the entrance.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along arrow III in FIG.

FIG. 4 is an enlarged view of an IV circle portion in FIG.

FIG. 5 is a cross-sectional view of a ring constituent member.

FIG. 6 is a side sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1 Fixing jig 2 pillar steel pipe 3 connecting plates 5 Ring body components 5a Arc plate part 5b, 5c Ring-shaped flat plate part 5d Standing plate part 6 ring body 7,17 Vertical plate 9,10 High strength bolt 12 and 15 ring plates 14 vertical ribs W weld

Claims (4)

[Claims] 1. A plurality of vertically extending vertically-attached, vertically extending pipes each having a multi-divided ring body removably fitted and fixed to the outer peripheries of the upper and lower column steel pipes facing each other. By connecting the plates to each other by connecting plates, the upper and lower pillar steel pipes are held and fixed in a coaxial state with their ends abutting each other, and in this state, the abutting parts of the upper and lower column steel pipes are abutted to each other. Are welded, and then the ring bodies are removed from the upper and lower column steel pipes, respectively. 2. A column steel pipe that is fitted and fixed to the outer periphery of the end portions of the upper and lower column steel pipes, respectively, and that holds the upper and lower column steel pipes coaxially and in a state where their ends are abutted to each other via a connecting plate. And a ring body which is of a multi-divided structure and is detachably fitted and fixed to the outer periphery of the end of the pillar steel pipe by connecting adjacent individual ring body constituent members, A column steel pipe, comprising: a vertical plate, which is provided on the outer circumference of the ring body along the circumferential direction at intervals and along a plane including the axis of the ring body and is connected to the connecting plate. Jig for fixing. 3. The jig for fixing a pillar steel pipe according to claim 2, wherein the ring body constituting member that constitutes the ring body is an arc plate portion that is in contact with an outer periphery of the pillar steel pipe, and the arc plate. Upper and lower ring-shaped flat plate portions that are attached to the top and bottom of the circular arc plate portion, and upright plate portions that are attached to the side edges of the circular arc plate portion. A jig for fixing a column steel pipe, characterized by being fitted and fixed to. 4. The jig for fixing a pillar steel pipe according to claim 2 or 3, wherein the vertical plate corresponds to a vertical rib extending from one side of the inner peripheral surface of the pillar steel pipe to the other side of the inner peripheral surface facing the inner peripheral surface. A jig for fixing a column steel pipe, which is provided at a position where