Civil: Form Work

FORM WORK

General:

The form work shall consist of shores, bracings, sides of beams and columns, bottom of slabs etc, including ties, anchors, hangers, inserts etc. complete which shall be properly designed and planned for the work. The false work shall be so constructed that up and down vertical adjustment can be made smoothly. Wedges may be used at the top or bottom of timber shores, but not at both ends, to facilitate vertical adjustment and dismantling of form work.

Design of Form Work

The design and engineering of form work as well as its construction shall be the responsibility of Contractor. The drawings and calculations for the design of the form work shall be submitted well in advance to the Engineer-in-charge for approval before proceeding with work, at no extra cost to the Department. Engineer-in-charge's approval shall not however, relieve Contractor of the full responsibility for the design and construction for the form work. The design shall take into account all the loads vertical as well as lateral that the

forms will be carrying including live and vibration loadings.

Tolerances:

Tolerances are specified permissible variation from lines, grade or dimensions given in drawings. No tolerances specified for horizontal or vertical buildings lines or footings. Unless otherwise specified, the following tolerances will be permitted.

Tolerances for R.C. Buildings: I) Variation from the plumb:

a)  In the line ad surfaces of columns, piers, walls and in buttresses: 5 mm per 2.5m, but not more than 25 mm.

b) For exposed corner columns ad other conspicuous lines

In any bay or 5 m, maximum : (+) 5 mm In 10 m or more: (+) 10mm

ii) Variation from the level or from the grades indicated on the drawings.

a) In slab soffits, ceilings, beam soffits and in arises.

b) In 2.5m (+) 5mm In any bay or 5m maximum (+) 8 mm In 10 or more (+) 15mm

c) For exposed lintels, sills, parapets, horizontal grooves and conspicuous lines

iii)  Variation of the linear building lines from established position in plan and related position of columns, walls and partitions. In any bay or 5m maximum (+) 10 mm In 10 or more (+)

20mm

iv)  Variation in the sizes ad locations of sleeves, openings in walls and floors except in the case of and for anchor bolts : (+) 5mm

Variation in cross sectional dimensions of columns and beams and in the thickness of slabs and walls: (+) 10 mm/(-)5mm

vi)Footing :

a) Variation in dimensions in plan (+) 50mm/(-) 5mm.V- Page 55 of 197

b) Misplacement or eccentricity: 2% of footing within the direction of misplacement but not more than 50mm.

c)  Reduction in thickness (-) 5% of specified thickness subject to maximum of 50mm. vii) Variation in steps:

a) In a flight of stairs Rise (+) 3.0 mm

Tread (+) 5.0 mm

b) Consecutive steps Rise (+) 1.5 mm Tread (+) 3.0 mm