component of structural steelwork

 

 In structural steelwork joining one component to another we use bolt is a common method. Sometimes bolting may be removed on sites or onto the shop and Axtella structures have the advantage that all instruments can be separated very easily because of some reason.  and much more businessman uses weldings for shop connection but shop bolting is generally found a cheaper way. the bolting is a  universal medium for connection. the main function of a bolt is to join 2 components to one another.   for steelworkers detailers need to understand how the bolts have to work

various types of bolts 

Bolts have 6 heads and nuts, parallel shanks, and threads cut or rolled into the shanks. They come in standard shank diameters of 12 mm, 16 mm, 20 mm and 24 mm in a large range of lengths and in various grades of strength

 • Type 1 — bolts of medium-carbon steel, in sizes 1 2 to 11 2 in. diameter, inclusive

• Type 2 — bolts of low-carbon martensite steel, in sizes 1 2 to 1 in. diameter, inclusive (not to be hot galvanized)

• Type 3 — bolts having atmospheric corrosion resistance and weathering

characteristics comparable with those of A588 and A242 steels in sizes 1

2 to 1 2 in. diameter, inclusive.

Bolt holes

The holes for the bolts will usually be punched or drilled and will have a diameter 2 mm larger than the bolt shank diameter for bolt sizes up to 24 mm diameter and 3 mm larger for bolts of greater diameter. Such holes are called clearance holes; they facilitate the assembly of components by making allowance for slight inaccuracies in the fabrication of the steelwork. Reference should bemade to specific codes where variations exist.

The three most commonly used types of bolt are the following:

(a) grade 4·8 ordinary bolts 

(b) grade 8·8 precision bolts

(c) high-strength friction-grip bolts.

 These bolts are used for force

transfer by friction between the connected parts

the rectangular pattern is usually followed for the arrangement of the bolt holes. The holes are in rows and the holes in one row are opposite those in other rows, because if it it gives us a neat and clear appearance. pitch is called spacing between bolts in the longitudinal direction of the member and cross-center distance is called spacing at right angles. Holes in the flanges of I- and H-sections and channels and the legs of angles are usually placed on lines at a set distance from the web centers of the I- and H-sections (gauge lines or cross-center lines) or from the backs of channels or angles. We will work with your project team to incorporate your specific shop standards and drawing styles to provide a smooth transition from shop to field erection.

At  Axtella structures  we use a 3D software program from Autodesk called Advance Steel. This program is ranked as one of the top software programs on the market. Modelling all projects in 3D, allows us to get a realistic view of what the finished project will look like and has several beneficial features to help the project go smoothly.