JPS5853151B2 - Joints for steel pipe steel assembly components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the construction of chord members and diagonals or columns when steel pipes with good cross-sectional performance are used as diagonals or place members in assembled structural members of steel buildings such as trusses and braces. This relates to the joint between beam material and place material.

According to the conventional technology, as shown in FIG. 8, when joining the chord members 1 and the steel pipe diagonal members 2, the gusset plate 6 is welded to the chord web portion 31 where the chord members 1 and the steel pipe diagonal members 2 intersect. ,
A notch 4 with a width equal to the thickness of the chord web is made at the end of the steel pipe diagonal member 2 to which the hemispherical cap 10 is welded to make it into a closed shape. This was inserted and the parts where the two touched were welded.

However, this configuration has the following problems.

a) Since welding of the hemispherical part cannot be considered for stress transmission,
As the weld length of the steel pipe diagonal becomes longer, the gusset plate also becomes larger.

b) In order to intersect the stress action lines 20 of the chord and diagonal members at one point, it is necessary to increase the distance between adjacent diagonal members, which also increases the size of the gusset plate.

C) For the above reasons, as the gusset plate becomes larger, the amount of iron increases, and the dead load also increases, making it difficult to design economically.

d) The welding method involves hemispherical welding (spherical welding), which makes welding management extremely difficult.

Therefore, in order to solve the above-mentioned problems in assembled structural members using steel pipe materials, the present invention creates a joint that does not require hemispherical caps or gusset plates by crushing the ends of the steel pipes and joining them to the chord members. The purpose is to provide.

The structure of the present invention will be explained based on the illustrated embodiments. The column material A or the beam material B of a steel structure as shown in FIG.
For example, in a truss structural member used for construction, as shown in Fig. 2, T-beams are used for the chord members 1 and steel pipes are used for the diagonal members 2. Cut it and make a notch 4 for inserting the string web part 3 at right angles to the crushed flat surface, insert the notch 4 into the chord web part 3, and weld the part where the two touch to form the string material 1. Connect diagonal members 2.

In this case, the respective lines of stress action 20 of the pair of diagonal members 2, 2 and the chord member 1, which are arranged along the mutually intersecting directions, are positioned so that they intersect at one point.

Since the present invention consists of the above configuration and operation,
It has the following effects.

b) Since a closed shape is formed by crushing the ends of the diagonal material, there is no need to use the hemispherical cap 10 as in the conventional method, and this prevents rainwater from entering the diagonal material, the occurrence of rust associated with this, and the risk of rust. Damage to diagonal members can be prevented.

Mouth) By not requiring a hemispherical cap, welding is effective from the end, so the depth of cut is significantly shorter than with conventional ones, resulting in a gusset plate to lengthen the welded part like conventional ones. 6 becomes unnecessary.

→ Since the end portions of the diagonal members form an inclined flat surface by crushing, by making these flat portions of each diagonal member 2, 2 face each other, it is possible to bring the two closer to each other at a relatively short distance.
Without using the gusset plate 6, the chord member 1 and diagonal member 2
The stress action lines 20 of can be relatively easily made to intersect at one point.

2) Chord member 1 and diagonal member 2 without using gusset plate 6
Since each stress action line 20 can intersect at one point, the tensile stress and compressive stress of the diagonal member 2 flow directly to the chord member 1, so there is no possibility of buckling of the gusset plate 6 as in the conventional case.

e) Gusset plate 6 accounting for 15-20% of the total weight
As a result, not only is the amount of material and welding significantly reduced, but the weight reduction also reduces dead weight, making it possible to create an economical design.

f) By crushing the end of the steel pipe while cutting it, compared to the conventional method of cutting while maintaining the circular shape, it is possible to greatly save labor in managing the cutting process of the steel pipe.

g) By adjusting the angle of the notch 4, it can be used not only for steel frame assembly members with a planar configuration but also for steel frame assembly members with a three-dimensional configuration.

Next, another embodiment of the present invention is described in FIG. 5 and FIG. 7, and the structure of this second embodiment is a case where a steel pipe diagonal member is used as a wall press member.

When assembling the steel pipe place material 9 to the corner of the column beam, the gusset plate 6 is welded to the corner of the column beam in advance, and the steel pipe serving as the place material is cut to a predetermined length while crushing the end.

At the same end, the gusset plate 6 is parallel to the crushed surface.
A notch 4 with a width equivalent to the thickness of the gusset plate is made, the notch is inserted into the gusset plate, and the parts where the two contact are welded to join the steel pipe press material.

According to the above configuration, the following effects are obtained.

b) By crushing the end of the steel pipe, it becomes a closed shape and does not require a hemispherical cap.

Since no hemispherical cap is required, welding is effective from the end, so the depth of cut is significantly shorter than in the conventional case, and the gusset plate can also be smaller.

→ Since the out-of-plane direction of the wall place material will not be larger than the thickness of the steel pipe, it can be used for places built into reinforced concrete walls.

[Brief explanation of the drawing]

Figure 1 is an elevation view of a building using truss structural members, Figure 2
The figure is a front view showing the first embodiment of the present invention used in parts A and B of Fig. 1, Fig. 3 is a vertical sectional view taken along the line ■-■ of Fig. 2, and Fig. 4
The figures are a cross-sectional view taken along the line IV--IV in FIG. Figure 7 is Figure 6 ■-■
FIG. 8 is a front view showing an example of a conventional joint. Explanation of symbols, A...Column assembly material, B...
...Beam assembly materials, 1...String materials, 2...
・・Diagonal material, 3・・・String material web, 4・・・・
・Diagonal material notch, 6... Gusset plate,
I... Beam material, 8... Pillar material, 9...
... Place material, 10 ... Hemispherical cap.

Claims (1)

[Scope of Claims] 1. A joint structure in which a steel pipe diagonal member is joined to a flat plate portion of a chord member or a flat plate portion integrally projecting from the chord member, wherein the steel pipe diagonal member has a diameter that gradually decreases at the joining side end. A cut that matches the thickness of the flat plate portion of the string member is provided at the joining side end portion which has been crushed into a flat shape and the tip portion is closed, and the flat plate portion is inserted into the cut, and the flat plate A joint for a steel pipe and steel frame assembly member, characterized in that a steel pipe diagonal member is integrally joined to a chord member by welding the edges of the cuts that contact both sides of the part to the flat plate parts. 2. The joint for a steel pipe steel frame assembly member according to claim 1, wherein the cut is made along the axial direction of the steel pipe diagonal member at a right angle to the cross-sectional longitudinal direction of the flattened portion. 3. The joint for a steel pipe steel frame assembly member according to claim 1, wherein the cut is made along the axial direction of the steel pipe diagonal member and parallel to the longitudinal direction of the cross section of the flat crushed portion. 4. The joint for a steel pipe steel frame assembly member according to claim 1, wherein the cut is inclined at an appropriate angle with respect to the axial direction of the steel pipe diagonal member.