JPH04237733A - Column/beam joint structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column-beam joint structure composed of a steel column and a steel beam having a closed cross section.

0002

[Problem to be Solved by the Invention] As an example of a method of joining a steel column with a closed cross-sectional shape and a steel beam, a long bolt is inserted between the opposing flanges of the steel column through a joining metal fitting connected to the end of the steel beam. There is a method of joining this using.

[0003] This is for the purpose of solving the problem of concrete filling when inserting a diaphragm into a steel column.
The structure uses a long bolt as a substitute for a diaphragm to connect the metal fittings to the steel column and transmit stress at the same time, but when connecting the metal fittings to the steel column, axial force is applied to the long bolt As the axial force is applied, the flange of the steel column with poor rigidity is
There is a risk of deformation as shown in the figure.

Structures using long bolts are based on the premise that the steel columns are filled with concrete, etc., and the reaction force of the long bolts is borne by the concrete, etc., so deformation of the steel columns is prevented, but the final There is an inconvenience in the construction process that the work of tightening nuts must wait until the concrete has hardened.

[0005] This problem can be solved by arranging a supporting material to serve as a separator in the direction in which the long bolts are installed, as shown in FIG. 9, but the dimensions of the supporting material are uniquely determined with respect to the internal dimension of the column. Therefore, it is not possible to respond to changes in column dimensions,
In addition, new problems arise, such as the need for high precision in manufacturing the support material.

[0006] The present invention was made by focusing on the numerous problems encountered when using such long bolts, and attempts to propose a new structure to solve these problems.

[0007]

[Means for Solving the Problems] In the present invention, a support member having a planar area smaller than the cross-sectional area of the inner circumference of the steel column is arranged inside the steel column, and one end of an adjustment bolt is screwed onto the outer circumference of this support member. ,
By placing the other end in contact with the joint hardware at the end of the steel beam that is joined to the steel column, the reaction force of the axial force of the long bolt is borne by the support material and adjustment bolt, and it follows changes in the dimensions of the steel column. do.

[0008] The supporting material is placed at the flange of the steel beam with a clearance between it and the inner peripheral surface of the steel column, and the adjustment bolt screwed onto the outer periphery of the support material passes through the flange of the steel column and is attached to the flange of the steel beam. Installed by being supported.

[0009] The side of the adjustment bolt in one direction that passes through the steel column comes into contact with the inner surface of the joint metal fittings that are joined to the steel column, so that it is a reaction force of the axial force of the long bolt between the opposing metal fittings. At the same time as bearing compressive force, it maintains the distance between both joint metal fittings when axial force is introduced into the long bolt, and prevents deformation of the flange of the steel column. Furthermore, since the length of the adjustment bolt protruding from the outer periphery of the support member can be adjusted, the support member can accommodate changes in the dimensions of the steel column within the range of this protrusion length.

[0010] The steel beam is joined to the steel column by long bolts passing through joint metal fittings connected to the ends of the steel beams, and nuts being tightened to the bolts.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on drawings showing one embodiment.

As shown in FIGS. 1 to 3, the present invention provides a joining metal fitting for connecting a steel column 1 having a closed cross section such as a square steel pipe or a circular steel pipe to a steel beam 2 having an H-shaped cross section to the end of the steel beam 2. 3 and
It is installed between the connecting hardware 3 and 3 of opposing steel beams, and is connected using the long bolt 4 that connects the connecting hardware 3 to the steel column 1. The support member 6, which handles the reaction force when tension is introduced, and the adjustment bolt 7, which is screwed into the support member 6, prevent the deformation of the flange of the steel column 1, regardless of the concrete filling, while the nut 5 is attached to the long bolt 4. This allows for tightening.

As the joining hardware 3, a split T hardware, a high split, or an end plate as shown in the figure is used, and this is connected to the end of the steel beam 2 by welding in advance.

The long bolts 4 are installed so as to penetrate between the opposing flanges and the metal fittings 3, 3, and nuts 5 are tightened at both ends to connect the metal fittings 3, 3 to the steel column 1.

The orthogonal long bolts 4, 4 are arranged with a step between them.

Further, since the joining hardware 3 has a certain height, the long bolts 4, 4 are attached in one direction and are arranged in two stages, upper and lower, and the support member 6 is located in the middle.

As shown in FIG. 3, the planar area of the support member 6 is smaller than the cross-sectional area of the inner circumference of the steel column 1. Specifically, as shown in FIG. The support material 6 is smaller than the inner dimension L C of the column 1 and is inserted into the steel column 1 with a clearance.

This support member 6 corresponds to the internal dimensions of the steel column 1 within the range of its length L0 plus the protrusion length of the adjustment bolt 7.

The support member 6 has a cross section that does not buckle due to the axial force of the long bolt 4, and in the embodiment, an opening is provided in the middle so as not to impede filling performance when filling the steel column 1 with concrete. It has been formed.

As shown in FIG. 4, female threads 6a are cut on the outer periphery of the support material 6 at appropriate intervals in the circumferential direction. are screwed together so that the protrusion length can be adjusted freely. A through hole 1a is formed in the flange of the steel column 1, which corresponds to the female thread 6a, through which the other end of the adjustment bolt 7 is inserted or screwed. It is set to such an extent that the influence of the cross-sectional defect of the hole 1b is not magnified.

The other end of the adjustment bolt 7 passes through the above-mentioned through hole 1a and comes into contact with the opposing surface of the joining metal fitting 3, as shown in FIGS. 2 and 3.

The adjustment bolt 7 is attached to the steel column 1 as shown in FIG.
The protruding length is adjusted so that the proximal end thereof abuts against the joining metal fitting 3. The work from inserting the support member 6 to screwing the adjustment bolt 7 is mainly performed at the factory.

The support member 6 is installed at a predetermined position within the steel frame column 1 using the plurality of adjustment bolts 7, and works together with the adjustment bolts 7 between the opposing metal fittings 3, 3 as shown in FIG. The reaction force of the axial force of the long bolt 4 is distributed and borne. P1 and P2 in the figure indicate the reaction force of the axial force of the long bolt 4.

In order to improve the contact of the adjusting bolt 7 with the metal fitting 3 and to provide sufficient resistance against the long bolt 4, the end face of the adjusting bolt 7 on the metal fitting 3 side is formed flat, and the screwing operation is improved. For convenience, it is desirable to form a groove for a driver on the end face as shown in FIG.

Furthermore, the insertion hole 1b for the long bolt 4 and the through hole 1a for the adjustment bolt 7 are drilled according to their respective diameters, but in order to simplify the drilling work, it is necessary to make both holes the same size. Just set it.

FIG. 6 shows an embodiment in which the steel column 1 is a circular steel pipe.

In this case, the joint part is the steel column 1 of the joint hardware 3.
The structure is similar to that of the embodiment shown in FIG. 3, except that the side surfaces are machined into a shape that circumscribes the side surfaces, and the adjustment bolts 7 are screwed into the support member 6 in the radial direction thereof.

[0028]

[Effects of the Invention] The present invention is as described above, in which a supporting member having a planar area smaller than the inner dimension of the steel column is arranged, and an adjustment bolt that can adjust the protruding length from the outer periphery is attached to the supporting member. At the same time as screwing together, the other end of the joint metal is brought into contact with the surface that circumscribes the steel column, and the reaction force of the axial force of the long bolt is borne by this adjustment bolt and the support material.
Nuts can be tightened on long bolts regardless of the presence of concrete, and by changing the protruding length of the adjustment bolt from the support material, steel columns can be tightened with only one set of support material and adjustment bolt. It is possible to accommodate changes in the dimensions of.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is an enlarged elevational view of a portion of FIG. 1;

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a perspective view showing how the support material and adjustment bolt are installed.

FIG. 5 is a plan view showing the bearing member and the state in which the force of the adjustment bolt is applied.

FIG. 6 is a plan view showing an example in which the steel column has a circular cross section.

FIG. 7 is a plan view showing a deformed state of a steel column in a conventional structure using long bolts.

FIG. 8 is a plan view of FIG. 7;

9 is a plan view showing a conventional structure in which the structure shown in FIG. 7 is reinforced; FIG.

[Explanation of symbols]

1... Steel column, 1a... Through hole, 1b... Through hole, 2...
...Steel beam, 3...Joining hardware, 4...Long bolt, 5...Nut, 6...Support material, 6a...Female thread, 7...Adjustment bolt.

Claims (1)

[Claims] Claim 1: A joint hardware that connects a steel column with a closed cross-sectional shape and a steel beam to the end of the steel beam, and a long bolt that is installed between the joint hardware of the opposing steel beam and connects the joint hardware to the steel column. This is a joint structure in which a steel beam is joined within a steel column, and a support member with a planar area smaller than the cross-sectional area of the inner circumference of the steel column is placed at the flange position of the steel beam within the steel column, and the outer circumference of this support member has an adjustable A column-beam joint structure characterized in that one end of the bolt is screwed together, and the other end of the adjustment bolt is in contact with a joining metal fitting that is joined to the steel column.