JPH04203041A - Joint structure between steel frame column and beam - Google Patents

Abstract

PURPOSE:To sharply reduce fabrication manhours for a column by a method wherein reinforcing plates having a rib plate and a screw hole are attached on the inner surfaces of the column surfaces of a portion where a square steel pipe column having length equivalent to length for a plurality of floors and continued in an axial direction with no seam is joined with a beam to join together the beam and the column. CONSTITUTION:Reinforcing plates 2 attached to the interior of a joint between a square steel pipe column 1 having length equivalent to length for two floors and continued in an axial direction with no seam is joined with a beam are mounted on the four sides of the square steel pipe columns 1. The reinforcing plate 2 has a screw hole 8 and a rib plate 9 is located in a direction extending at right angles with the axis of the column to screw in a bolt 7. The bolt 7 for mounting a beam inserted through a bolt insertion hole 16 for mounting a beam formed in the column 1 is inserted in a beam mounting metal 6 to screw it in a screw hole 8 of the reinforcing plate 2. This constitution enables improvement of a bearing force to the tension and compression of a bolt securing part.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a column-beam joint structure for steel structures.

[Prior art and its issues]

Square steel pipes have conventionally been used as column materials for steel frame buildings. However, this rectangular forging requires a large load to be applied at the joint with the beam material, so it is necessary to weld the diaphragm to the column material for reinforcement, which increases the number of man-hours required to manufacture the steel frame.

As a method to solve this problem,
As disclosed in Publication No. 26, a column and beam in which a copper plate having reinforcing ribs is arranged inside a column, and short bolts for fixing a beam mounting bracket are inserted through the steel plate and tightened to fix the beam to the beam mounting bracket. A joining device has been proposed.

However, this method requires the joint of the column materials to be placed near the beam joint, which not only takes time and effort to weld, but also poses a problem in terms of strength. Additionally, if the beam does not attach to any of the four sides of the square steel pipe column, there is also the problem that the column-beam joint portion lacks rigidity and strength. Furthermore, since the positions of the bolts used to attach the reinforcing ribs and the beams are misaligned, there was also the problem that the thickness of the reinforcing steel plate had to be increased.

[Means to solve the problem]

The present invention has been proposed in order to solve the problems of the prior art, and the present invention has been proposed in order to solve the problems of the prior art. It has a reinforcing plate with rib plates and screw holes in the direction perpendicular to the surface, and the beam can be attached to the end of the beam by inserting bolts through the metal fittings or end plates and fixing them into the screw holes of the reinforcing plate. It is a column-beam joint structure in which beams are joined to columns.

[Embodiment] The present invention will be described below with reference to a first embodiment illustrated in Figures 1 and 3. As shown in Figs. Inside, reinforcing plates 2 are attached to four sides of the square steel pipe column 1. The reinforcing plate 2 has screws 68 at positions corresponding to each of the bolts 7 for attaching the beam, and has a rib plate 9 in a direction perpendicular to the column axis. The screw 68 for screwing the bolt 7 is provided to a depth that reaches the rib plate 9 in order to ensure a large bolt fixing force. At this time, in order to enhance strength and rigidity, it is preferable to provide the reinforcing plate with perforations and rib plates in the same horizontal plane, and such a reinforcing plate is used in this embodiment.

In this example, the width of the reinforcing plate interface portion 4 with the square steel pipe column is about 374 mm of the column axis, but the larger this width is, the greater the tensile and compressive force applied to the column surface from the reinforcing plate 2 after construction. I can endure it.

In this embodiment, the reinforcing plate 2, including the drilled holes and rib plates, is integrally formed by casting, but it may also be formed by other methods such as forging or welding, but in the case of casting or forging, the number of man-hours and processing accuracy will vary. This is more preferable. Further, the reinforcing plate may be divided into two parts and provided for each of the upper and lower beams.

For example, the reinforcing plate 2 is held in place by holding the reinforcing plate at the tip of an insertion rod, inserting the insertion rod through the opening at the end of the column, and then using the reinforcing plate fixing bolts 10 inserted from outside the square steel pipe column. be done. By providing a recessed hole or a through hole at a predetermined position in the square steel pipe column, providing a convex portion in the reinforcing plate, and fitting the two, the reinforcing plate can be easily positioned within the copper pipe. Another method for fixing the reinforcing plate is to weld it from the outside of the column using holes drilled in the column surface. Furthermore, work can be easily carried out by welding from inside the column at beam joints provided near the ends of the columns.

Other forms of reinforcing plate 2 are shown in FIGS. 8 to 17. The reinforcing plates shown in FIGS. 8 to 14 have tapped holes in the thick, knot-shaped portions of the rib plates. Furthermore, among square steel pipes, those generally referred to as electric resistance welded pipes have a welded seam as a convex portion on the inner surface of the steel pipe. In this case, as shown in FIG. 17, a concave portion larger than the convex portion is formed in a portion of the reinforcing plate that faces the convex portion. Higher strength and rigidity can be expected in some cases if reinforcing plates are installed on two or more inner surfaces of the column instead of separately on the four sides of the column, but in order to do so,
Tightening bolts on two or more surfaces requires high parts manufacturing accuracy and manufacturing and assembly accuracy so as not to cause excessive stress on the steel pipe surface and the reinforcing plate, which is undesirable as it requires a lot of processing time. Note that the number of screws is appropriately set so as to withstand the tensile strength applied to the ends of the beams.

Further, the reinforcing rib plate 9 may be flat as in this embodiment, or, for example, if the periphery of the tapped hole is made thick so as to surround the tapped hole as shown in FIG. I can endure it. Furthermore, if the width of the reinforcing rib plate 9 is made in an arc shape with a narrow center as shown in Fig. 8, a substantially circular hollow part will be formed inside the mesh pipe, which will be convenient when filling with concrete and inserting the reinforcing plate. It is. Furthermore, if the gaps between the four rib plates 9 of the reinforcing plate 2 provided on the four sides of the column are appropriately narrowed, the concrete can be centrifugally molded at the factory to form the concrete between the beam attachment part and other parts or the upper and lower floors. It functions as a partition plate when the pillars are filled with varying thicknesses within the width of the rib plate.

Particularly when filling concrete with columns erected, if a through hole is provided at the base of the rib plate as shown in Figure 6.9.16, concrete can be filled in the bottom surface of the rib plate 9 without any gaps. suitable.

Note that the number of perforations is appropriately set so as to withstand the tensile strength applied to the ends of the beams.

Next, the beam 5 is inserted through the beam mounting bolt insertion hole 16 provided on the column surface, and the beam mounting bolt 7 is inserted into the beam mounting bracket 6.
It is fixed to the column surface by inserting it through the reinforcing plate and screwing it onto the screw 68 of the reinforcing plate. Prior to fixing the columns and beams, the beam mounting metal fittings are fixed to the beams using friction bonding bolts 13.

In this embodiment, a split T-shaped beam fitting is used for the beam mounting metal fitting 6, but the same effect can be obtained by using an end plate 12 shown in FIG. 6. The end plate 12 is welded to the end of the beam. In this case, a recess or a through hole larger than the head of the end plate 12 and the head of the reinforcing plate fixing bolt 10 is provided in the contact surface of the end plate with the column surface so that both come into close contact. ing.

A second embodiment is shown in FIGS. 2 and 4. In this embodiment, only the in-house column-beam joints are filled with concrete 3 in advance at the factory. It is more preferable for the concrete 3 to be non-shrinkable or low-expandable, since this will improve the adhesion between the column surface and the concrete. In this embodiment, first, the reinforcing plate 2 is fixed to the inner surface of the column from the outside surface by attaching a bolt (not shown) that passes through the bolt insertion hole 16 to the screw hole of the reinforcing plate. Next, with the column erected, concrete is poured into the column-beam joint within the column through the injection port 17 provided at the top of the column-beam joint. In order to fill only the column-beam joints with concrete, if a bag 11 that can be inflated with air is used as a partition as shown in FIG. 5, it is easy to fill only the column-beam joints. Alternatively, for example, as shown in FIG. 7, one or more rods 14 may be made to protrude from the inner surface of the column, and an elastic resin body 15 may be locked thereto to be used as a partition.

The bolts that fixed the reinforcing plates during the concrete filling described above are removed after the concrete has developed its strength and before the columns and beams are assembled. In this way, if the column-beam joints are filled with concrete in advance at the factory, there will be no protrusions on the column surfaces when the beams are joined during the column-beam assembly, and the column-beam assembly work can be carried out efficiently. The thus obtained column was attached to a split T-shaped beam in the same manner as in Example 1, by joining the beams with bolts via metal fittings 6.

In the column-beam joint manufactured in this way, the corner IC of the square steel pipe column, which cannot be reinforced with a reinforcing plate, is reinforced by filling with concrete, and the rigidity and strength of the column-beam joint are improved. In addition, in column-beam joints where the beam is not attached to all four sides of the square steel pipe column,
The surface where the beam cannot be attached becomes the weak point in terms of strength. In such cases, reinforcing plates can be attached to reinforce the copper pipe surface, but the bolts for attachment protrude outside the column surface, making it troublesome to attach the wall material and install the fireproof coating. These problems can be solved by filling concrete into the column-beam joints. Even if mortar is used instead of concrete, the effects of this invention remain the same. Moreover, if concrete is filled in advance at a factory as in this embodiment, stable quality can be obtained.

〔Effect of the invention〕

(1) Since the columns are continuous over multiple floors, the number of man-hours required to process the columns can be significantly reduced. In addition, since the column material has a seamless structure in the axial direction, there are few defects in strength.

(2) No welding work is required to fix the beam to the column, resulting in excellent production efficiency.

(3) Since the reinforcing plate is provided with a rib plate, the tensile and compressive strength of the portion to which the bolt is fixed is improved, and the reinforcing plate and the steel pipe column can be made thinner. Furthermore, even if continuous rectangular steel pipes are used across multiple floors, the column-beam joints have strength and rigidity that can be designed as a rigid frame structure. Furthermore, if the rib plate and Holt shaft are provided on the same surface, their strength and rigidity will be maximized.

(4) If the reinforcing plate is divided into two parts corresponding to the upper and lower flanges of the column, and the size of the beam is large, the total weight of the reinforcing plate will be small, making it light and easy to handle.

Additionally, when beams of different heights are attached to a column, one type of reinforcing plate can be used.

(5) When assembling columns and beams, there are no protrusions on the column surface that the metal fittings meet, and the beam can be directly attached to the column surface. After the columns and beams are assembled, there are no bolts or other protrusions on the surfaces where the beams are not attached, allowing wall materials to be attached closer to the columns.

In addition, the following effects (6), (7), and (8) can be obtained by filling the column-beam joints with concrete.

(6) The corners of square steel pipe columns, which are difficult to reinforce with reinforcing plates, are reinforced with concrete, improving the rigidity and strength of the column-beam joints. In column-beam joints where beams cannot be attached on all four sides, the sides where beams cannot be attached become weak points in terms of strength, or this can be solved by filling them with concrete.

(7) By filling concrete at the factory,
Concrete of stable quality can be obtained.

[8] By filling concrete only in the beam-to-column joint portion of the column, it is possible to obtain a column material that is lighter than a column in which the entire column is filled with concrete.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the joint showing the first embodiment, Fig. 2 is a cross-sectional view of the joint showing the second embodiment, and Fig. 3 is a detailed cross-sectional view of the main part of the first embodiment. Fig. 4 is a horizontal sectional view of the second embodiment, Fig. 5 is a joint sectional view showing a concrete filling method using an inflatable bag, and Fig. 6 is a cross-sectional view of a beam connected to a column using an end plate. FIG. 7 is an explanatory diagram of a method of filling concrete into the column-beam joint, and FIGS. 8 to 17 are perspective views showing reinforcing plates. 1... Square copper pipe column, la... Beam joint of square steel pipe column, IC... Corner, 2... Reinforcement plate, 3... Concrete, 4... Square steel pipe of reinforcement plate Interview part with pillar, 5.
...Beam, 6...Metal fittings for beam installation, 7...Pole 1-18 for beam installation...Screw hole, 9...Rib plate, 10...
Reinforcing plate fixing bolt, 11... Bag that can be inflated with air, lla... Air hose, 12... End plate, I3... Friction bonding bolt and nut for beam attachment, 14... Rod shape , 15... Elastic resin body, 16... Bolt insertion hole for beam installation, 16a...
Insertion hole, 17... Inlet. Figure 3-t et al. b4

Claims (1)

[Claims] (1) A reinforcing plate with a rib plate and a screw hole in a direction orthogonal to the column surface is provided on the inner surface of the column surface at the part where the square steel pipe columns and beams that are seamlessly continuous in the axial direction of multiple floors are to be connected, A steel column-beam joint structure in which the beam is connected to the column by inserting bolts into the beam attachment fittings or end plates provided at the ends of the beams and screwing them into the screw holes in the reinforcing plate.