JPH07127142A - Joining structure and joining method of steel aggregate with closed section - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to join closed-section steel aggregates, such as square steel pipes, by bolt joining without the joint member protruding significantly to the outside. [Structure] An inner joint member (14) and an outer joint member (13) are temporarily fastened to the end of one steel aggregate (11) by a torcia type bolt (21) or the like so that they can be tightened from the outside. The other steel aggregate (12) inserted between the joining members (13) and (14) is inserted into the joining bolt (25) from the outside by screwing the stud (25) into the joining member (14) from the outside. The nut (28) is tightened and fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a steel aggregate having a rectangular steel pipe or other closed cross section and a joining method therefor, which is particularly suitable for joining columns.

[0002]

2. Description of the Related Art Conventionally, as a means for joining ends of rectangular steel pipe columns in a straight line, a welded joint for welding these to each other in situ has been generally performed.

FIGS. 10 and 11 show the structure thereof. First, the erection pieces (2) and (2) are provided at the ends of the steel pipe columns (1) and (1) along the longitudinal direction on their outer side surfaces, respectively. Are pre-welded, and the steel pipe columns (1) and (1) are installed on site so that the erection pieces (2) and (2) are linear with each other, and the erection pieces (2) and (2) 2) are connected to each other with bolts (5) by a connecting plate (3) to hold each steel pipe column (1) (1) in a mutually accurate state, and in this state, the steel pipe column (1) ( In-situ welding (6) is performed around the edges of 1). And erection piece (2) (2)
Is for gas cutting after completion of welding.

[0004]

In the above-mentioned conventional joint, the erection piece (2) is cut so that there is no protrusion on the outer periphery of the joint portion, which hinders the arrangement of other members around the joint portion. However, the welding itself requires a high degree of skill, and there is a disadvantage that only skilled workers can work. There is also a problem that quality control is difficult.

Moreover, there is a risk of fire due to sparks or the like during welding, and there is a drawback that in order to secure work safety, provisional scaffolding and curing until the welding is firmly fixed are required. In addition, there is a problem in that it is difficult to work on a rainy day or a windy day and is easily affected by the weather.

The present invention solves the drawbacks of the conventional method of joining closed-section steel frames, and the joining members largely project the closed-section steel aggregates such as square steel pipes to the outside thereof. It was made for the purpose of making it possible to carry out bolt joining without a problem.

[0007]

In order to solve the above-mentioned problems, the joining structure of the present invention comprises an inner joining member arranged across the inner side surfaces of a pair of hollow iron aggregates joined together,
Similarly, the outer joining member is arranged to extend over the outer surface of the open end portion, and these joining members are attached in advance to the one steel aggregate member by a bolt that can be tightened from the outside, and the other iron aggregate member. In the above, while being screwed to the inner joint member with the stud bolt inserted from the bolt hole of the outer joint member and the other steel aggregate, it is screwed to the outer end portion of the screwed bolt. It is fixed by tightening the nut from the outside.

In the above description, it is conceivable that the bolts and the studs that are finally tightened after being temporarily fixed are torcia-type high-strength bolts that can be tightened from one of the outer sides.

In such a torcia-type high-strength bolt, it is conceivable that the male screw on the implanting side and the male screw on the nut side of the implanting bolt are opposite to each other.

Further, according to the joining method of the present application, an inner joining member abutting on an inner surface of the iron aggregate is joined to one end of the inner portion of the pair of hollow iron aggregates joined to each other, and an inner joining member is also joined to the outer surface thereof. The abutting outer joint member is temporarily fixed by a bolt that can be tightened from the outside of the outer joint member,
In this state, after inserting the other steel aggregate between the respective joining members protruding from the end portion of the one steel aggregate, before or after the final fastening of the temporarily fixed bolt, the outer joining member and one of the steel aggregates It is characterized in that a stud bolt inserted through and is attached to the inner joint member side by screwing, and is fixed by tightening with a nut screwed to the stud bolt from the outside of the outer joint member.

[0011]

As described above, each joining member is attached to the end portion of one steel aggregate member by temporarily fixing it in advance. Both the temporary fixing bolt and the stud bolt are both implanted and tightened. It is possible to work from the outside and therefore
The ends of the closed-section steel aggregate can be easily joined to each other by bolt joining on the spot. Further, since there is nothing that largely protrudes in the outer peripheral direction of the joint except for the outer joint member and the outer portion of the tightening bolt, there is no risk of hindering the arrangement of other members around the joint.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing an embodiment of the present invention, (1
1) is a square steel pipe column as one of the steel aggregates of the present invention,
Similarly, 2) shows a square steel tubular column as the other steel aggregate. Reference numerals (13), (13), ... Denote metal plate-made outer joint members installed across the outer surfaces of the steel pipe columns (11, 12). (14) (14) ... are the same for each steel pipe column (1
1) An inner joint member having an L-shaped cross section which is attached so as to straddle the inner corner portions of (12). As shown in FIG. 1, each steel pipe column (11) is attached to the outer joint member (13).
Bolt holes for bolting to (12) (15) (15)…
But those steel pipe columns (11) (12) bolt holes (16) (1
It is formed corresponding to 6).

On the other hand, in the inner joint member (14), as shown in FIGS. 2 and 6, it corresponds to the bolt hole (15) of the lower steel pipe column (11) on one side to which the joint member (14) is attached in advance. Bolt hole (17) and the other, that is, the upper steel pipe column (12)
Screw holes (18) corresponding to the bolt holes (16)
(18) ... and are formed. To form the screw hole (18), the inner joint member (14) is connected to the screw hole (1).
8) The peripheral part is bulged (19) in a circle.

The inner joint member (14) and the outer joint member (13) are temporarily fixed to the ends of one steel pipe column (11) in advance, and the torcia-type high-strength bolt is attached to it. (21) is used, and the high-strength bolt (21) is applied to the inner surface of the steel pipe column (11) from the back surface side of the inner joint member (14), and bolt holes (17), (16) and ( 15)
The nut (22) from the outside
It is designed to be attached by screwing. The high-strength bolt (21) is integrally formed with a pin tail (23) having a break neck at the tip of the male screw portion so that the high-strength bolt (21) can be tightened by a dedicated tightening machine as described later.

In this way, the outer joint member (13) is previously prepared.
After attaching the inner joint member (14) and the inner joint member (14) to one steel pipe column (11), insert the lower end portion of the other steel pipe column (12) on the upper side from above between the joint members (13) (14). Set up. At this time, as shown in FIG. 1, the gap between the joining members (13) and (14) is expanded so as to widen toward the upper end, and the steel pipe column (12) can be easily inserted. .

As described above, the upper steel pipe column (12)
After installing, install this steel pipe column (12) from the outside with the bolt (2
It is fixed by 5). This bolt (25)
Has a male part (27) for implantation on one side and a male screw (29) for a nut (28) on the other side of the cylindrical part (26) in the middle. Has been done. Male screw (2
7) (29) have mutually opposite threads, the male thread (27) on the implantation side is the left thread, and the male thread (29) on the nut (28) side.
Is screwed to the right. In addition, the male screw (2
Hexagonal head (30) for implantation work on the tip side of 9)
However, a pin tail (31) with a break neck for tightening the nut (28) is integrally formed at the tip thereof.

The tightening work of the implanting bolt (25) is as follows.
As shown in FIG. 3 and FIG. 4, first, as shown in FIG. 3, the tip of the male screw (27) on the implantation side is passed from the outside of the bolt hole (15) of the outer joint member (13) to the upper steel pipe column (12). ) Through the bolt hole (16) and the male screw (27)
Is screwed into the female screw (18) of the inner joint member (14) to be attached. Thereafter, as shown in FIG. 4, the nut (28) is screwed into the male screw (29) on the nut side, and is tightened using a dedicated tightening machine (32). As is well known, the tightening machine (32) includes an outer socket (33) for holding a nut (28) and an inner socket (3) externally fitted to the pin tail (31) to hold a bolt (25).
4) and are designed to rotate in opposite directions, which enables tightening on one side from the nut (28) side, and the tightening torque is a constant load. When it reaches, the break neck portion is broken and an accurate tightening torque can always be obtained.

In this case, since the male screw (27) on the implanting side is a reverse screw, that is, a left screw, the inner socket (34) may rotate during tightening and the male screw (27) may loosen. Without, it enables accurate torque management. That is, if the bolt (25) side rotates during tightening, there is the inconvenience that accurate torque control cannot be performed. In this way, however, the stud bolt (25) is operated by the left screw action of the male screw (27) on the stud side. Since it can be held so as not to rotate, such tightening torque can be set accurately.

The bolts (21) on the temporary fixing side are also tightened from the outside by using a special tightening machine (32). This tightening is final tightening, and the stud (2
5) Before or after tightening.

FIG. 7 and subsequent figures show another embodiment of the inner joint member (14). In FIG. 7, bolt holes (36) are formed on the inner joint member (14) on the stud bolt (25) side. Is provided, and the back nut (37) is press-fitted into the back surface of the bolt hole (36) at the protruding end portion thereof to form a female screw for mounting the stud bolt. .

In FIG. 8 or 9, a detent box (39) formed by bending a metal plate is fixed so as to fit into the bolt hole (36) of the inner joint member (14), and this detent is secured. The back nut (37) is locked in the box (39) to prevent the back nut (37) from rotating.

As described above, as means for forming the female screw on the inner joint member (14), direct screw processing is performed,
Alternatively, it may be of any type such as attaching a back nut.

[0023]

As described above, according to the present invention, the inner joint member and the outer joint member are temporarily fixed beforehand with bolts which can be tightened from the outside on one end side of the steel aggregate, and the other end. On the side, after the stud bolt is attached to the inner joint member from the outside or outside, it can be fixed by tightening the nut from the outside as well.On the other hand, the bolts on the temporary fixing side should also be tightened from the outside to perform the final tightening Therefore, it is possible to join the steel aggregate on-site by bolts without using conventional welding work.

In particular, except for the outer joint member and the tip of the bolt, there is nothing that largely projects around this joint portion, so that even if other members are arranged in the peripheral portion, the arrangement is hindered. It has the effect of never becoming.

In this case, the studs can be screwed from the outside while the one-way work is performed from the outside.
It is not necessary to insert the bolt into the bolt hole from the inside of the steel aggregate, for example, it is not necessary to form a working hole for inserting the bolt from the inside in the steel aggregate, and the strength of the steel aggregate can be improved by such a working hole. There is no drawback of lowering the.

Further, since the bolt tightening work can be easily performed by using a dedicated tightening machine or the like, it does not require skill like welding work and the torque management is easy, so that the accuracy is high. It is possible to obtain a junction structure with high quality. Furthermore, unlike welding work, there is no inconvenience of being affected by fire hazard or weather.

In addition, since the bolts on the temporary fixing side can be attached before the installation of the steel aggregate or in the factory in advance, it is not necessary to perform the work on the temporary fixing side at a high place, and the work on the site is not required. There is an effect that work at high places can be completed in such a short time.

Further, by using a torcia type high-strength bolt as both the stud bolt and the temporarily fixing bolt, the tightening work can be easily performed, and
In particular, in the bolt on the implanting side, the male thread on the implanting side is a reverse screw, and as described above, the effect that the torque management is always performed accurately is obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of a joining portion showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part showing a mounting structure of a temporarily fixing bolt and a stud on an inner joint member.

FIG. 3 is a perspective view of a joint portion showing a method of attaching a stud.

FIG. 4 is a vertical cross-sectional side view of a main part showing the tightening method of the tightening bolt of the stud.

FIG. 5 is a vertical cross-sectional view of a joined state of each steel aggregate.

FIG. 6 is a longitudinal sectional view of a main part of an inner joining member.

FIG. 7 is a longitudinal sectional view of an essential part showing another embodiment of the inner joint member.

FIG. 8 is a longitudinal cross-sectional view of a main part showing another embodiment of the inner joint member.

9 is a perspective view of a back nut used in the embodiment of FIG. 8 and a rotation stop box for the back nut. FIG.

FIG. 10 is an enlarged vertical cross-sectional view of a main part showing a conventional method of joining rectangular steel pipe columns.

FIG. 11 is likewise an exploded perspective view of a joint portion.

[Explanation of symbols]

 (11) Square steel tube column (12) Square steel tube column (13) Outer joining member (14) Inner joining member (15) Bolt hole (16) Bolt hole (17) Bolt hole (18) Screw hole (21) Temporary Bolt on the stop side (22) Nut (25) Bolt (27) Male screw on the implant side (28) Nut (29) Male screw on the nut side (31) Pin tail

Claims (5)

[Claims] 1. A pair of hollow iron aggregates to be joined to each other, the inner joint member being disposed over the inner side surface, and the outer joint member also disposed over the outer side surface of the open end portion. The joining member is one of the steel aggregates,
It is pre-attached by a bolt that can be tightened from the outside, and in the other steel aggregate, it is screwed to the inside joint member with a stud bolt inserted from the bolt hole of the outside joint member and the other steel aggregate. In addition, the joint structure of the steel aggregate having a closed cross section characterized in that the nut is screwed to the outer end of the screwed bolt and is fixed from the outside. 2. The structure for joining steel aggregates with a closed cross section according to claim 1, wherein the temporarily fixing bolt is a torcia type high strength bolt. 3. The closed cross section according to claim 1, wherein the stud is a torcia-type high-strength bolt, and has a pin tail at a tip end portion rather than a male screw on the nut side. Bonded structure of steel aggregate. 4. The joining of a steel frame material having a closed cross section according to claim 3, wherein the male screw on the implanting side and the male screw on the nut side of the implanting bolt are mutually opposite screws. Construction. 5. An inner joining member that abuts on an inner side surface of the iron aggregate and an outer joining member that also abuts on an outer surface of one end of the pair of hollow iron aggregates joined to each other. And is temporarily fixed by a bolt that can be tightened from the outside of the outer joining member, and in this state, after inserting the other steel aggregate between the joining members protruding from the end of the one iron aggregate, Before or after fully tightening the temporarily fixed bolts,
The stud bolt inserted through the outer joint member and one of the steel aggregates is screwed to the inner joint member side and attached, and tightened with the nut screwed from the outside of the outer joint member to the stud bolt. A method for joining steel aggregates having a closed cross-section, characterized by fixing.