JPS5865850A - Joint of truss 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 The present invention relates to a joint provided between each member of a main pipe (chord member) and a branch pipe (belly member) of a truss structure. As shown in FIG. In the conventional truss structure, as shown in FIG. 1, when assembling the main pipe 1 and branch pipes 2a, 2b, the ends of the branch pipes 2a, 2b are joined to the main pipe 1 by welding 3, as shown in FIG. 2.

In such a case, the welding work is troublesome, such as having to process the ends of the branch pipes 2a and 2b into a saddle shape. When a load P0 is applied as shown in FIG. 1, a load P is applied to the branch pipe 2a in FIG. 2, causing local deformation in the main pipe 1 as shown in FIG. 3, and a large local stress is generated. In order to solve this problem, as shown in FIG. 5 in the earlier application, a branch pipe attachment part 26a is provided.

In this method, the branch pipe 2a and the main pipe 1 are welded to the joint 4. The bulge of this joint was designed to be able to connect to the branch pipe as smoothly as possible in order to suppress local stress at the weld toe of the joint. A depression I is formed between the bulge A and the bulge as shown in FIG. However, as shown in Figure 6, when a load P is applied to the branch pipe, the area between the bulges must withstand a component force H, and therefore, if there is a depression γ between the bulges, this area will This results in bending stress and excessive local stress. Also, in the longitudinal direction, as shown in FIG. 7, since depressions 27a are formed, local stress is generated.

An object of the present invention is to eliminate local stresses occurring in the joint.

-' The main points of the present invention are a structure in which a plurality of bulges for connecting branch pipes to a main pipe joint of a truss structure, and a structure in which some or all of the bulges are linearly connected. It has the basic Kirinari structure, which prevents the generation of stress due to the uneven shape.

Embodiments of the present invention will be described below with reference to FIGS. 8, 9, and 10.

As mentioned above, the shape of the joint in the earlier application was determined with emphasis on the local stress at the toe of the branch pipe weld, so in addition to the problems of the sixth Kaihata-mote, the joint as shown in Figure 6 was When used, the load P
Most of the force due to the flow is on the outside (A side) and the inside 111J (
It was found that there was relatively little flow in B@), and that the local stress at the B side weld toe did not become a problem. The main cause of local stress between the bulges is the generation of bending stress due to the unevenness of the shape, and connecting these parts linearly causes bending stress and impairs the smoothness of the joint joint, but as mentioned above, However, since it was clear from the load flow that this was not a serious problem, for the first time we were able to introduce a linearly connected structure that could prevent the occurrence of bending stress.

The embodiment shown in FIG. 8 is a joint (
capital). The force acting on the joint side is almost inversely symmetrical in the longitudinal direction of the truss, and is almost inversely symmetrical in the left and right directions with respect to the truss axis.
A cross-sectional shape in which portions b are linearly connected by a straight portion 28a is effective.

The embodiment shown in FIGS. 9 and 10 uses a joint 31 used between the lower main pipe 1c and the branch pipes 1a, ld, and la of the triangular truss poop. In this joint 31, in the longitudinal direction of the truss,
Since both symmetrical and antisymmetrical loads can act, the longitudinal bulges 31a and 31b are linearly connected by the straight portion 28b, and the mounting bulge 31c of the lower surface right angle branch pipe 1d and the branch pipe 1a are connected linearly.
The mounting bulges 31a are linearly connected by a straight line portion 28c to reduce local stress between the bulges due to deformation of the bulges.

As described above, the present invention has a structure in which the bulges for joining branch pipes are linearly connected, and it is possible to prevent the occurrence of bending stress due to unevenness, thereby minimizing local stress. This has the advantage of being able to provide a joint for a truss structure that does not require the use of a truss structure.

[Brief explanation of the drawing]

Figure 1 is an overall view of a conventional planar TOSYS structure, Figure 2 is an enlarged view of section A in Figure 1, Figure 3 is a sectional view taken along the line B-B in Figure 2, and Figure 4 is a truss girder and boom. Fig. 5 is an overall view of the joint of the earlier application, Fig. 6 is a sectional view of the main branch pipe joint using the joint of the earlier application, and Fig. 97 is the main branch pipe joint using the joint of the earlier application. FIG. 8 is a sectional view of a main branch joint using a joint according to one embodiment of the present invention, and FIG. 9 is a side view of a main branch joint using a joint according to another embodiment of the present invention. The side view, M2O view, is a sectional view of the main branch joint shown in FIG. 9. 1, l c--master, la, lb, ld, le
= Branch pipe, 28 a, 28 b, 28 c - Straight section, 30.31... Joint, Xla, 30
b , 31 a , 31 b , 31 c =
・-Expansion Department Agent Patent Attorney Susuki 1) Toshiyuki + S Zu Kensai 6 tq Zuma'to Diagram] Continued page % Inventor Kazuo Makino 794 Higashitoyoi, Kudamatsu City Stock % formula % Kudamatsu 794 Higashitoyoi, Hitachi, Ltd. Kasado Factory 229-

Claims (1)

[Claims] 1. In the k-th joint that connects the main pipe and branch pipe of a truss structure, the joint has a plurality of bulges for welding the branch pipes, and some or all of the bulges are connected linearly. A truss structure joint characterized by a shoulder shape (l-shoulder).