Fabrication And Erection Ms

Fabrication Preparation of shop drawing as per the drawings and getting it approved from the engineer in charge. Welding Welding will be metal-arc welding complying with the requirements of BS1856 or BS5135, as appropriate. All welds will be continuous unless specified otherwise. All fillet welds will approximate to the thickness of the thinnest member to the joint. All parts will have the edges accurately prepared to the appropriate profile for welding. Welding will be carried out only under the direction of an experienced and competent supervisor and only certified welders qualified in this class of work in accordance with BS4872 will be employed. Welding procedures will be such that residual stresses are minimal and that distortion is avoided. All fillet welding will be tested by ultrasonic, crack detection, or other approved means. For all items of steel work the Contractor will allow for the cost of adequate radiograph examination of the welds. The welds and positions to be examined will be indicated by the Engineer Bending No straightening or flattening by bending or use of heat will be carried out without approval of the Engineer and, if so approved such straightening or flattening will be carried out as specified by the Engineer. Cutting Shearing or cropping will only be allowed for cutting of strips and plates less than 12mm thick. Hand flame cutting will not be permitted. Irregularities as a result of cutting will be removed by welding and grinding. Holing All holing will in principle be carried out by drilling unless approved otherwise by the Engineer. Holes may be punched provided that : - punching is carried out before assembly - the total thickness of the material to be punched is not more than 15mm - the holes are punched 3mm less in diameter than the required size and reamed to the full diameter; In other cases punching will not be permitted. All holes for bolts will be 2mm more in diameter than the nominal bolt size unless higher tolerances are approved by the Engineer. All holes will be free from burrs. position. Holes less than 5mm out of specified position may be reamed to suit.

Bolting All nuts and screws will be securely fastened, to prevent loosening due to vibration, by means of spring washers, lock nuts, split pins or any other approved means. Between all nuts and steelwork at least one normal washer must be used. If deemed necessary by the Engineer, washers will be placed both under the nut and the bolt head. Stainless steel bolts, nuts and washers will be used for holding all renewable parts and all parts made of stainless steel. High strength friction bolts will be tightened to the requirements of BS 4604. The Contractor will have a torque wrench at Site for tightening and checking of bolts at all times. Marking of Parts Steel and other metalwork will be uniquely and indelibly marked to indicate position and direction in which it is to be fixed. Works Erection If required by the Engineer, the steel and other metalwork will be temporarily assembled at the place of manufacture for inspection by the Engineer and, if considered necessary, for testing before delivery. Site Erection Before any work on erection is begun on the Site, the Contractor will submit to the Engineer for his approval the methods he proposes to use for the erection of the steel and other metalwork and will make any arrangements and take any precautions directed by the Engineer. Notwithstanding these requirements the entire responsibility for the adequacy of the Temporary Works will rest with the Contractor. The Contractor will fix the steel and other metal work complete and will provide and erect all temporary staying and bracing necessary for carrying out the Works. The Contractor will be responsible for the accuracy of setting out of all steel and other metalwork. He may use shop details and other necessary drawings prepared by the supplier. The approval of the Engineer for any such drawings will not relieve the Contractor of responsibility for the correct fitting of all material. Unless specified otherwise, all bases will be positioned 50mm or as shown on the drawings above the concrete foundations on levelling nuts. Thereto every base will feature at least 4 anchor bolts. Stanchions will be plumbed and levelled by adjusting the levelling nuts and then be tightening the closing nuts. The space between the base plate and concrete will be filled with a free flowing non shrink grout with a 28 days strength of at least 25 N/mm². Labour and equipment required for erection as well as other works specified

GUIDELINES FOR STRUCTURAL STEEL WORK Act. No.

DESCRIPTION

AUTHORITY

REMARKS

1

Study of Drawing & Specification

Engineer in Charge Structural

Ref. procedure for control, of drg.

2

Preparation of shop drawing & approval from client whenever required

Engineer in Charge Structural

Ref. procedure for control, of drg

3&4

Prepare bill of quantity & send requirement to Purchase Department

Engineer in Charge Structural

Ref. record file

5

Receive material & issue to site

Storekeeper

Ref. procedure for incoming material inspection

6&7

Fabrication & getting inspected by engineer

Engineer in Charge Structural

Welding test report

8

Painting shop coat / ready for erection

Engineer in Charge Structural

As per drgs. Specification inspection report maintained

9

Erection

Engineer in Charge Structural

As per drgs specifications instructions from client check list maintained

10

Check by Engineer

Engineer in Charge Structural

Erection report maintained Joint record maintained

11

Painting

Engineer in Charge Structural

As per drgs. Specifications instruction from client