JPH0227980Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the provision of a new welded joint member for a truss member in an ultra-large span three-dimensional truss.

For example, when configuring the joints of truss members in a super-large span space truss that exceeds 100 m,
As the diameter of truss members becomes larger and the number of truss members gathered in a joint increases, different circumstances arise than in the case of small spans. The economic efficiency of super-large span space trusses made under such conditions depends on the quality of the design of the joints and joints of the truss members.
Regarding joints, much research and development is being carried out with the aim of improving economic efficiency, workability, and truss accuracy, but the reality is that there are not many that can be actually applied.

In other words, there are few design examples of super-large-span three-dimensional trusses, and there are also few actual examples of the joint/joint method for truss members. According to , the diameter of the member is generally about 500 mmφ, and if a large number of these are concentrated at the joint, the diameter of the joint ball will become extremely large. Generally, even if it is 1.5 to 3.0 times the diameter of the part, it will be 750 mmφ to 1500 mmφ for thick-walled materials, and the steel material,
Considering the amount of welding, it becomes a very uneconomical joint, and the cost is very high.Also, the gusset system (H/T/B tightening) and on-site welding joints have a large cross section due to stress transmission. Due to the large number of joint members that must be designed in a crowded manner, it is necessary to design them to an unnecessary size in terms of strength in order to secure the allowance for bolting and welding work, and the total weight of the truss steel materials increases. Compared to this, the amount of steel in the joint is much larger.
By the way, if the joints of truss members such as pipes are designed using the gusset system, the amount of steel at the joints will account for 25 to 35% of the total weight of the truss, and even if this method is used, congestion will occur. The problem is that the workability and accuracy are low.

The present invention was developed in view of the above-mentioned circumstances, and its gist is that the joint is a multi-branched plate with a cross section necessary for stress transmission, which has a gusset for butt welding aligned in the direction of the assembled truss members. As it is integrally molded as a cast steel, there is no need to secure the allowance for bolting or welding as mentioned above, the joint part is small and lightweight, and it is easy to carry out construction such as lifting up an extremely large span. Considering its performance, it is extremely economical, significantly reducing costs and improving workability and accuracy.

This will be explained in detail below based on the drawings.

Figure 1 is a longitudinal side view of the three-dimensional truss.
B and C indicate the truss members of the truss upper chord, truss lower chord, and truss diagonal member in a one-way planar truss; Indicates the material.
The encircling line A in the figure indicates the joint/joint part of the truss member.

Note that the illustrated joint portions are set in four horizontal directions and four diagonal directions.

FIG. 2 is an overhead view of the proposed member, and FIGS. 3 a and 3 b are longitudinal cross-sectional end views of the joint section showing the joint mode using the proposed member, and a plan view of the truss diagonal member in an unwelded state.

As shown in Fig. 2, the joint member 1 of the present invention is provided with butt welding gussets 1a and 1b (molded into plate shapes) that match the number and direction of the truss members gathered at the joint part and also serve as reinforcing ribs. The gussets 1a and 1b are determined to have a cross section necessary for transmitting stress, and the multi-branched plate body is integrally formed of cast steel. . Therefore, the plate joint base does not require consideration for welding and is designed to have a minimum scale.

A welding groove 6 or a back metal plate 7 is also formed at the welded portion with the truss members 2 and 3.

In this case, as shown in Fig. 3, the chord members 2 and diagonal members 3 of the truss member are butted on-site to the cast steel joint member 1 via connecting plates 2a and 3a attached to the ends thereof. Perform welding 4 and 5 to form a joint and a joint.

Although this proposal is based on on-site welding, it is of course possible to weld the joint member 1 to one of the members 2 and 3 in advance at a factory, and then weld the remaining members on-site.

According to the configuration of the present invention, various effects as listed below can be achieved.

(1) Compared to ball joints, gusset system joints, etc., construction is simpler and costs can be significantly reduced.

(2) Since Shiguchi is made of cast steel, the number of truss members,
It can respond freely to any direction and has high accuracy.

(3) The joint part has a weld groove and a molded back plate, making it easy to work and has high truss accuracy.

(4) There is no need to tighten bolts at the joints and secure allowance for welding work, resulting in a finished product with no extra thickness and less steel.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of the three-dimensional truss, Figure 2 is an overhead view of the proposed member, and Figures 3 a and b are longitudinal cross-sectional end views of the joint part showing the joint form of the proposed member, when the truss diagonal members are not welded. FIG. 1... Cast steel joint member, 3... Chord material, 3... Diagonal material, 2a, 3a... Connection plate, 4, 5...
Welding, 1a, 1b... Gusset for butt welding, 6... Groove for welding, 7... Back sheet metal.

Claims (1)

[Scope of utility model registration request] An ultra-large span three-dimensional truss characterized in that the joint is a multi-branched plate body having a butt welding gusset that also serves as a reinforcing rib and is aligned with the direction of the assembled truss members, and is integrally formed as cast steel. Welded joint members of truss members.