B-1 AGREEMENT System Generated e-Tender No ... - e-Tendering

SPECIFICATION FOR FORMWORK AND STEEL, CENTERING :-
I) FORMWORK :-
76 Dy. Executive Engineer
1.1 Formwork :- Formwork shall include all temporary forms of moulds required for forming the
concrete which is cast-in-situ, together with all temporary construction required for their
support. Unless otherwise stated all formwork shall conform to I.S. Specification.
1.2 Design of Formwork :- Formwork including complete false work shall be designed by the
contractor in accordance with I.S.: 2750 (1964), 4041 (1987) and all other relevant I.S. codes
without any extra cost to the Government and these shall be got approved from Engineer
before any formwork is taken up.
1.3 The contractor shall entirely be responsible for the adequancy and safety for false work notwithstanding
any approval or review by the Engineer of his drawing and design. Proprietary
system of formwork if used a detailed information shall be furnished to the Engineer for
approval.
2. QUALITY OF SHUTTERING: The shuttering shall have smooth and even surface and its
joints shall not permit leakage of cement slurry.
2.1 Ply-board shuttering materials to be used shall be steel shuttering/marine plywood well
seasoned free from projecting nails, splits or other defects that may mark on the surface of
concrete. It shall not be so dry as to absorb water from concrete, or so green or wet as to
shrink after erection. Mild steel plates or plywood shall be used for slab and beam bottoms.
2.2 The timber shall be accurately spawned planed on the sides and the surface coming in
contact with concrete.
2.3 So far as practicable, clamps shall be used to hold the forms together. Where use of nails is
unavoidable minimum number of nails shall be used and these shall be left projecting so that
they can be easily with drawn. use of double headed nails shall be prefered.
3. TOLERANCE :-
3.1 The formwork shall be made so as to produce finished concrete true to shape, lines, levels
plumb and dimensions as shown on the drawings, subject to the following tolerance unless
otherwise specified in these documents or drawings or as directed by the Engineer :
a) Section dimension = 5 mm
b) Plumb = 1 in 1000 of height
c) Levels = 3 mm before any deflection takes place.
3.2 Tolerance given above are specified for local aberrations in the finished concrete surface and
should not be taken as tolerance for the entire structure taken as a whole or for the setting
and alignment of formwork which should be as accurate as possible to the entire satisfaction
of the Engineer, Errors if noticed in any lift/ tilt of the structure after stripping of forms, shall be
corrected in the subsequent work to bring back the surface of the structure to its true
alignment.
4. SPECIAL PROVISION :- Whenever the concreting of thinner members in required to be
carried out within shutters of considerable depth, temporary openings in the side of the
shutters shall, if so directed by the Engineer be provided to facilitate the puring and
consolidation of the concrete. Small temporary openings shall be provided as necessary at
the bottom of shutters of walls and deep beams to permit the expulsion of rubbish etc.
5. REMOVAL OF FORMWORK :- The formwork shall be so removed that it shall not cause
damage to concrete. Centering shall be gradually and uniformly lowered in such a manner as
to avoid any shock or vibrations. Supports shall be removed in such a manner as to permit
the concrete to take stresses due to its own weight uniformly and gradually.
The whole of the formwork removal should be planned and definite scheme of operation shall
be worked out. Under no circumstances forms be struck until the concrete reaches a strength
of at least twice the stress to which the concrete may be subjected at the time of striking but
not before the period as mentioned in IS:456-2000 where ordinary portland cement is used.
Signature of Contractor No. Of Corrections Executive Engineer