JPS6334795Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is useful for arranging two or more elongated members containing steel pipes at a certain angle, such as truss beams or columns whose diagonals are made of steel pipes, or braces made of steel pipes. This invention relates to welded joints for the ends of steel pipes that are joined together.

Conventional technology When manufacturing a truss beam or truss column whose diagonal members are made of steel pipes, the main member (chord member) and the diagonal member are connected so that their axes coincide at one point at the node. If not joined, not only axial force but also bending moment will be generated in each member, and to compensate for this, the size of the main material and diagonal material must be increased from the designed size, resulting in the disadvantage of increased manufacturing costs. . However, when steel pipes are used as diagonal members, the ends of the steel pipes become bulky at the nodes, so it is necessary to join the main member and diagonal members so that their axes coincide with one node within the size of the main member determined by structural calculations. becomes extremely troublesome. Therefore, conventionally, when joining diagonal members 2, . Welding increases the cross-sectional height of the node portion, and forms a cut groove 4 at the end of the diagonal member 2, inserts the reinforcing plate 9 into the cut groove 4, and inserts the steel pipe 2 into the reinforcing plate 9,... By welding these, the axis of the main material and the axis of the diagonal material were prevented from misaligning.

Problems to be Solved by the Invention However, this joint requires a reinforcing plate and requires work to attach the reinforcing plate, which increases manufacturing costs. In this case, caps are also provided at the ends of the diagonal members to increase the welding area between the diagonal members and the main member to increase the welding strength between the diagonal members and the main member, and to prevent rainwater and dust from entering the diagonal members. Although it is installed to close the ends of the diagonals, it is extremely troublesome to manufacture as it requires the production and installation of caps.

This idea was proposed to solve the above-mentioned drawbacks of the conventional method, and when assembling truss columns or truss beams using steel pipes as diagonal members, the ends of the steel pipes can be joined very easily and firmly. The purpose is to provide welded joints for steel pipe ends.

Means to solve the problem This idea smashes the end of the steel pipe into the end of the steel pipe.
A reinforcing piece is inserted therein to form a substantially flat joining flange, a cut groove is formed in the joining flange orthogonal to the width direction of the joining flange, and a joining flange is formed on the long member to which the steel pipe is joined. The above object is achieved by providing a protruding joint flange, inserting the joining flange into the cut groove, and welding the joining flange to each other.

Embodiment Hereinafter, this invention will be explained by an embodiment illustrating the invention. FIGS. 1 and 2 show a truss beam, in which the upper and lower chord members 1, 1 are formed of T-shaped steel, the diagonal members 2,... …
is made of steel pipe. Approximately flat joining flanges 3, 3 are formed at the upper and lower ends of the diagonal members 2, . . . by crushing the ends of the diagonal members 2, . Joint flange 3, 3
Cut grooves 4, 4 perpendicular to the width direction are formed by cutting into the diagonal members 2, . . . to some extent (see FIGS. 4a and 4b). And diagonal member 2,...
... inserts the joining flanges (hereinafter referred to as webs 1a, 1a) of the upper and lower chord members 1, 1 into the cut grooves 4, 4, and also inserts the joining flanges 3, 3 and the web 1a,
It is joined to the upper and lower chord members 1, 1 by welding them to the upper and lower chord members 1, 1a. In this case, the material axes of the upper and lower chord members 1, 1 and the material axes of the diagonal members 2, 2 coincide at one point at the joint. Figures 3a, b, and c show a truss beam in which the upper and lower chord members 1, 1 are made of angle steel, H-beam steel, and cross-beam steel.

FIG. 5 shows a joint at the end of the brace 5 made of steel pipe.

When inserting the reinforcing piece 8 into the end of the steel pipe, in order to ensure that the reinforcing piece 8 is firmly fixed inside the joining flange 3, the reinforcing piece 8 should be made of a steel plate with a rough surface, or the end of the steel pipe should be inserted with a slight gap. It is preferable to crush the reinforcing piece 8 into the joint flange 3 by crushing it to the extent that the joint flange 3 is formed.

Effects of the invention This invention consists of the above-mentioned structure, and the following effects can be expected.

When manufacturing truss beams and truss columns whose diagonal members are made of steel pipes, it is possible to omit reinforcing plates to connect the diagonal members to the main member and caps that close the ends of the diagonal members, making it extremely easy to remove the ends of the steel pipes. Can be joined. In addition, a reinforcing piece is inserted into the joint flange at the end of the steel pipe, so
The joint strength is also extremely high.

By eliminating the occurrence of bending moments due to misalignment between the main material axis and the diagonal material axis at the joint, stress transmission between the main material and the diagonal material at the joint can be made smooth, and as a result, the main material and Economical design can be achieved because there is no need to increase the size of the main member and the diagonal member from the design size in order to reinforce the diagonal member.

[Brief explanation of drawings]

Figures 1 and 2 are partial side views and cross-sectional views of truss beams, and Figures 3 a, b, and c are partial side views of truss beams whose upper and lower chord members are made of angle steel, H-beam steel, and cross-beam steel. Figures 4a and 4b are plan and side views showing details of the joining flanges at the ends of steel pipes, Figure 5 is a side view of the column base of the steel frame showing welded joints for steel pipe braces, and Figure 6 is It is a partial side view of a conventional truss beam. 1... Upper and lower chord members, 1a... Web, 2... Diagonal members, 3... Joining flange, 4... Notch groove, 5
... Brace, 6 ... Steel column, 7 ... Connection flange, 8 ... Reinforcement piece, 9 ... Reinforcement plate.

Claims (1)

[Scope of utility model registration request] A welded joint for the ends of steel pipes that joins two or more elongated members including steel pipes at a certain angle. forming a joint flange having a shape, forming a cut groove perpendicular to the width direction of the joint flange, protruding the joint flange from the long member to which the steel pipe is to be joined, and inserting the joint flange into the cut groove. A welded joint for an end of a steel pipe, characterized in that the joining flanges are welded together.