JP2565859Y2 - Fitting metal fittings for welding round bars - Google Patents

Description

[Detailed description of the invention]

The present invention is a joint auxiliary metal fitting for connecting round steel by welding, and has been developed mainly for use as a joint of a turnbuckle bolt shaft for a building turnbuckle. Things.

2. Description of the Related Art A turnbuckle for a building is conveniently manufactured by assembling a body part and a bolt part and welding it to a round steel according to its length at a building factory or a building site.
There was no suitable joint method. For this reason, the JIS standard stipulates that the bolt shaft should be manufactured from a single steel rod and have no joints. Many shafts are welded by imperfect methods such as butt welding and lap joints.

[Problem to be solved by the invention] The bolt portion and the bolt shaft portion of the turnbuckle bolt are joined by a joint by welding,
Moreover, it is intended to obtain higher performance than that manufactured from one steel rod.

SUMMARY OF THE INVENTION As a method of joining round bars by welding, butt welding and lap jointing are commonly used. Butt welding is a method in which sufficient strength can be expected if it is completely welded, but it is difficult to determine whether welding is complete or incomplete only by visual inspection, and reliability is poor.
The lap joint is to overlap the ends of the round bars and weld the joint, and since the welding length can be taken sufficiently, the welding strength is sufficient, but the center line is different, so pulling There are drawbacks such as bending and poor appearance. As another method, there is a method in which a round bar is inserted into a pipe, and the end of the pipe and the inserted round bar are welded with fillet. According to this method, the outer diameter of the joint portion is small, and the joint is the most compact. However, the strength of the welded portion against pulling is insufficient, and it has been considered that the joint is not practical at all. The present invention compensates for the fatal defect, in order to increase the welding length and obtain sufficient welding strength, a slit is provided in the longitudinal direction of the pipe, and the edge of the slit and the round steel are welded. is there. The required thickness of the pipe is increased by the amount of the slit, but its width is small, so the outer diameter does not become too large.

EXAMPLE As an example, a round steel (SS41 or SR2) was used.
4) 13^mmWill be described.
First, the thickness 3.2^mmLength 50^mmWidth 43^mmSteel plate
If it is rolled into a cylindrical shape, the length will be 50^mmWidth 8^mmThe slip
Pipe (1) with Round steel for pipe (1)
(4, 5) is 25^mmInsert one by one, pipe end (3)
And the edge of the slit (2) are melted into round steel (4, 5) respectively.
Touch When calculating the allowable stress (short term) of each part,^13mmReference strength F = 2400^kg/ Cm² 1.33 cm cross section²  Allowable tensile stress 1.33 × 2400 = 3192^kg  Steel plate (SS41) 4.3 × 0.32 × 2400 = 3302^kg  Welded area 0.25 × 0.32 × 2 + (1.3 × 3.14-0.8) × 0. 32｝Therefore, the strength of the joint is equal to or greater than the strength of the round steel.
The turnbuckle is M14. Bolt valley diameter 1
1.2^mm Cross section 0.99cm²Is acceptable
The force is smaller than round steel. As specified by JIS, tar
If the buckle bolt is manufactured from one steel bar,
Is the allowable stress of the bracing. By using the present invention,
Use high strength steel such as SR30 for turnbuckle bolt
Turnbuckle strength equivalent to round steel by using
It becomes possible. In this embodiment, one slit
However, depending on the outer diameter of the round bar and the thickness of the steel plate used,
The number of cuts may be two or several.

[Effects of the Invention] The joint made by welding round steel of the present invention is (1) compact and has a good appearance. (2) Since the welding state can be visually discriminated, sufficient strength can be obtained even by welding of an inexperienced person. If this invention is utilized, the body and the bolt of the architectural turnbuckle are manufactured and supplied as one set, and can be used by welding with a round bar at a building factory or a building site, which is very convenient. As shown in the examples, the strength of the bracing is equivalent to that of the round steel used, and the performance is better than that of the JIS standard.

[Brief description of the drawings]

 Fig. 1 shows the auxiliary fitting of the present invention. Fig. 2 shows the turnbuckle using the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe with slit 2 Slit for welding 3 Pipe end 4 Round steel 5 Turnbuckle bolt 6 Turnbuckle body

Claims (1)

(57) [Scope of request for utility model registration] 1. A pipe (1) having a suitable length, a round bar (4, 5) is inserted into the pipe, and the end of the pipe (3) is welded to the round bar (4, 5) at a joint for fillet welding. In order to increase the welding length and obtain sufficient welding strength, one or several slits are provided in the longitudinal direction of the pipe (1), and the longitudinal edge of the slit (2) and the round steel (4, 5) is a fillet welding metal fitting for welding.