Indian Raod cngress

Section 1900
Structural Steel
All structural steel members and parts shall have straight edges and blunt surfaces. If
necessary, they shall be straightened or flattened by pressure unless they are required to
be of curvilinear forms. They shall also be free from twist. Pressure applied for straightening
or flattening shall be such as would not injure the materials. Hammering shall not be
permitted. Adjacent surfaces or edges shall be in close contact or at uniform distance
throughout.
The Contractor shall submit his programme of work to the Engineer for his approval at
least 15 days before the commencement of fabrication. This programme shall include the
proposed system of identification and erection marks together with complete details of
fabrication and welding procedures.
The Contractor shall prepare shop drawings for fabricating any member and obtain approval
of the Engineer before the start of work. Complete information regarding the location,
type, size and extent of all welds shall be clearly shown on the shop drawings. These
drawings shall distinguish between shop and field welds.
1904.2 Preparation of Edges and Ends
All structural steel-parts, where required, shall be sheared, cropped, sawn or flame cut
and ground accurately to the required dimension and shape.
End/edge planning and cutting shall be done by any one of the following prescribed methods
or left as rolled :
a) Shearing, cropping, sawing, machining, machine flame cutting.
b) Hand flame cutting with subsequent grinding to a smooth edge.
c) Sheared edges of plate not more that 16 mm thick with subsequent
grinding to smooth profile, which are for secondary use such as
stiffeners and gussets.
If ends of stiffeners are required to be fitted, they shall be ground, so that the maximum gap
over 60 percent of the contact area does not exceed 0.25 mm.
Where flame cutting or shearing is used, at least one of the following requirements shall be
satisfied.
a) The cut edge is not subjected to applied stress.
b) The edge is incorporated in weld.
c) The hardness of cut edge does not exceed 350 HV30.
d) The material is removed from edge to the extent of 2 mm or minimum
necessary, so that the hardness is less than 350 HV 30.
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