Civil: Structural Steel

STRUCTURAL STEEL

Scope of Work :

The work covered by this specification consists of furnishing ad erecting of structural steel complete in strict accordance with this specifications ad the applicable drawings. 

Materials :

All structural steel shall be of standard sections as marked on the drawings ad shall be free of scale, blisters, laminations, cracked edges ad defects of any sort. If the structural steel

is  not  supplied  by  the  Department  and  the  Contractor  is  required  to  bring  such  steel,  the Contractor shall furnish duplicate copies of all mill orders and / or also the test report received from the mills, to satisfy the Engineer-in-charge. All structural steel and electrodes shall comply in all respects with relevant I.S.S. for structural steel.

Workmanship :

All workmanship shall be of first class quality in every respect to get greatest accuracy to ensure that all parts will fit together properly on erection. All ends shall be cut true to planes. They must fit the abutting surfaces closely. All stiffeners shall fit tightly at both ends. All holes in plates and section between 12mm and 20 mm thick shall be punched to such diameter that 3mm of metal is left all around the hole to be cleaned out to correct size by reamer.

The base connection shall be provided as shown on drawings and the greatest accuracy of workmanship shall be ensured to provide the best connections. Figured dimensions on the drawings shall be taken.

Erection and Marking :

Erection ad fabrication shall be according to IS 800-1984 section -11. During erection, the work shall be securely braced and fastened temporarily to provide safety for all erection stresses etc. No permanent welding shall be done until proper alignment has been obtained. Any part which do not fit accurately or which are not in accordance with the drawings and specifications shall be liable to rejection and if rejected, shall be at once be made good. Engineer-in-charge shall have full liberty at all reasonable times to enter the contractors premises for the purpose of inspecting the work and no work shall be taken down, painted r dispatched until it has been inspected and passed. The contractor shall supply free of charge all labour ad tools required for testing of work.

Delivery at Site :

The contractor shall deliver the component parts of the steel work in an undamaged state at the site of the works and the Engineer-in-charge shall be entitled to refuse acceptance of any portion which has been bent or otherwise damaged before actual delivery on work. Shop

Drawing :

The shop drawings of structural steel based on contract drawings hall be submitted to the Engineer-in-charge. The necessary information for fabrication, erection, painting of structure etc. must be furnished immediately after acceptance of the leader.

Painting :

Painting should be strictly according to IS. 1477-1971 (Part-I-Pretreatment) and IS

1477-1971 (part-II painting). Painting should be carried out on dry surfaces free from dust, scale etc. The paint shall be approved by the Engineer-in-charge. Once coat of shop paint (red lead) shall be applied on steel, except where it is to be encased in concrete or where surfaces are to be field welded.

Welding :

Welding shall be in accordance with IS. 816-1969,IS819-1957, IS 1024-1979, IS1261-1959, IS 1323-1982 and IS 9595-1980 as appropriate. For welding of any particular type of joint, welders shall give evidence of having satisfactory completed appropriate test as described in ay of IS 817-1966, IS 1393-1961, IS 7307 (part-I) -1974, IS 7310 (part-I) 1974 and IS 7318 (part-I) 1974 as relevant.

Welding Consumables:

Covered electrodes shall conform to IS 814 (part-I) - 1974 and IS814 (part-II)- 1974 or IS 1395-1982 as appropriate. Filler rods and wires for gas welding shall conform to IS

1278-1972. The bar wire electrodes for submerged are welding shall conform t IS 7280-1974. The combination of are and flash shall satisfy the requirements of IS 3613-1974.

The filler rods ad bare electrodes for gas shielded metal, are welding shall conform to IS 6419-1971 and IS 6560-1972 as appropriate .

Type of Welding :

Are welding (direct or alternating current) or Oxyacetylene welding may used. Field welding may be used. Field welding shall be by D.C.