JPH04258429A - Joint structure of large beam and small beam - Google Patents

Abstract

PURPOSE:To increase the transportation efficiency of a large beam and at the same time omit welding works of jointing metal pieces to a large beam to joint the lower flanges of small beam with each other. CONSTITUTION:A joint plate 3 straddling over the upper flanges of a large and small beams 1, 2, a gusset plate 4 connected to both webs, and lower flanges are jointed to each other in a large beam 1 and small beams 2, 2. They are jointed rigidly by use of a joint metal 5 with a strap bolt type composed of a flat plate 5a and a bolting part 5b. The joint metal 5 is separated from the large beam 1 and the bolting part 5b of the joint metal 5 is connected to the web of the large beam 1 by a screw jointing type on jointing to the small beam 2. The protruded parts from the large beam 1 are removed until the jointing time with the small beams. Hence, the conveyance efficiency of the large beam 1 is increased and welding labor of jointing metals 5 can be omitted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a large beam and a small beam in a steel frame structure, in which a small beam is rigidly connected to a large beam.

0002

[Prior Art and Problems to be Solved by the Invention] As shown in Fig. 4, the joint between a large beam and a small beam in a steel frame structure is constructed using a small gusset plate that is fillet welded and protrudes from the web and flange of the large beam. A common method is to bolt the webs of beams together, and this type of joint is designed as a pin joint that transmits only shear force, not bending moment.

On the other hand, when connecting a small beam to a large beam rigidly, in addition to the gusset plate, a joint plate is installed across the upper flanges of the small beam and large beam, and this is connected to both sides. At the same time as bolting, a plate for the small beam is bolted to the lower flange of the small beam, and this is welded to the gusset plate to create a structure in which the tensile and compressive forces from the small beam are transmitted to the large beam. It will be done.

[0004] When small beams are rigidly connected, the amount of deformation and stress are approximately 1/5 and 1/5, respectively, compared to the case of pin connections.
/3, which has the advantage of reducing the cross section and weight of the small beam, but requires time and effort in machining the plate that connects the lower flange of the small beam to the girder and welding the web of the girder to the gusset plate. Moreover, since this plate protrudes largely from the web of the girder in its width direction, there are problems such as poor transportation efficiency.

[0005] This invention improves the conventional structure for rigid connection.
This work focused on the problems associated with welding plates to girders, and attempts to propose a new structure to solve this problem.

[0006]

[Means for Solving the Problems] In the present invention, the lower flange of the small beam and the web of the large beam are connected using joint metal fittings separated from both, thereby eliminating the protrusion of parts from the large beam until delivery to the site. In order to facilitate transportation, one side of the metal fittings is bolted to the lower flange of the small beam, and the other side is connected to each other in a threaded joint manner across the web of the main beam, thereby eliminating the need for welding.

[0007] The joining hardware overlaps the lower flange of the beam,
It consists of a flat plate part with multiple bolt holes that is bolted to this, and a male threaded bolt part that is continuous with this flat plate part and has an axis parallel to the plane. They are connected to the beams with bolts, and the bolt parts are screwed into couplers fixed to the webs of the girders and are connected to each other on the same axis, thereby transmitting stress between the small beams facing each other with the girder in between.

The coupler is fixed to the web by, for example, being screwed into a through bolt passing through the web of the girder from both sides of the web.

[0009] The upper flanges of the main beam and the small beam are installed across both upper flanges at the same time, and are bolted to both.
Both webs are joined by conventional joint plates, and by gusset plates that project perpendicularly to the web of the girder by welding and are bolted to the web of the girder, and the connection between the girder and the girder is between these and the lower part. A rigid connection is achieved with the joining hardware on the flange side.

0010

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

As shown in FIG. 1, the present invention includes a large beam 1 and a small beam 2 of a steel frame structure, a joint plate 3 that connects the upper flanges of both, a gusset plate 4 that connects the webs, and a The lower flanges are connected to each other, and at the same time, they are rigidly joined to the web of the girder 1 using a joining metal fitting 5.

As shown in FIG. 1 and FIG. 2, which is an arrow view taken along the line 6 to connect the upper flanges of the small beams 2, 2 and the large beam 1.

As shown in the figure, the gusset plate 4 has a height extending between the upper and lower flanges of the girder 1, is welded to the flanges and the web in advance, and is joined to the webs of the small beams 2 with bolts 6 on site.

As shown in FIG. 1 and FIG. 3, which is a sectional view taken along the line Y--Y, the joining hardware 5 is a flat plate having a plurality of bolt holes, which overlaps and is joined to the lower flange of the small beam 2. It is formed into a battledore bolt shape from a part 5a and a male-threaded bolt part 5b which is continuous with the flat plate part 5a and has an axis parallel to the surface of the flat plate part 5a. , 2 is connected to the lower flange of 2 by bolt 6,
The bolt parts 5b, 5b are connected to each other with the web of the girder 1 in between.

The bolt parts 5b, 5b of the joining metal fittings 5, 5 facing each other with the girder 1 in between are connected to each other by screwing into a coupler 7 fixed to the web of the girder 1, as shown in FIGS. 1 and 3. Ru.

The couplers 7, 7 are arranged, for example, on both sides of the web of the girder 1 as shown in the figure, and are connected by screwing from both sides of the web to through bolts 8 passing through insertion holes 1a made in the web. is fixed to the web by.

The bolt parts 5b, 5b of the joining metal fittings 5, 5 are screwed into the couplers 7, 7 from both sides, and are tightly connected to the coupler 7 by tightening the nuts 9 attached to the bolt parts 5b. Joined. After being connected to the main beam 1, the joining hardware 5 is joined to the small beam 2 by bolts 6, and transmits the stress between the lower flanges of the small beams 2, 2 facing each other with the large beam 1 in between.

The small beam 2 is rigidly connected to the main beam 1 by the joint plate 3, gusset plate 4, and joining hardware 5 described above.

[0019]

[Effects of the Invention] The present invention is as described above, and since the lower flange of the small beam is connected to the main beam using a joining hardware separated from the web of the main beam, it is not necessary to remove parts from the main beam until construction on site. The girder can be transported efficiently without protruding.

[0020] Furthermore, since the joining hardware is connected to the girder in a screw joint type, on-site welding work is eliminated, and workability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a view taken along line XX in FIG. 1;

FIG. 3 is a sectional view taken along the Y-Y line in FIG. 1;

FIG. 4 is a vertical cross-sectional view showing a conventional structure in the case of pin joining.

FIG. 5 is a longitudinal sectional view showing a conventional structure in the case of rigid connection.

[Explanation of symbols]

1... Large beam, 1a... Insertion hole, 2... Small beam, 3... Joint plate, 4... Gusset plate, 5... Joining hardware,
5a... Flat plate part, 5b... Bolt part, 6... Bolt, 7
...Coupler, 8...Through bolt, 9...Nut.

Claims (2)

[Claims] Claim 1: A gusset plate that protrudes perpendicularly to the web of the main beam and is bolted to the web of the small beam, and a joint that is installed across the upper flanges of both the large beam and the small beam at the same time and is bolted to both. Rigidly joining the small beam to the main beam using a plate and joining hardware that is bolted to the lower flange of the small beam and connected to each other across the web of the large beam;
This is a joint structure in a steel frame structure, and the joint hardware is a flat plate part with multiple bolt holes that overlaps the lower flange of the small beam and is bolted to this, and a flat plate part that is continuous with this flat plate part and parallel to its surface. It consists of a bolt part with a shaft and a male thread, and the flat plate part of the joining hardware is joined to the lower flange of each small beam, and the bolt part facing across the girder is attached to a coupler fixed to the web of the girder. A joint structure of large beams and small beams that is characterized by being screwed together and connected to each other. 2. The joint structure of a girder and a small beam according to claim 1, wherein the coupler is fixed to the web by being screwed onto a through bolt passing through the web of the girder from both sides of the web.