PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

9.6 Dowels.
Where and as designated, steel bar dowels shall be provided for anchorage to
previously cast concrete.
For anchorage to existing construction, an approved non-shrink epoxy type grout or
approved bolting devices shall be used.
9.7 Bending.
a. Reinforcement bars supplied bent or in coils, shall be straightened before they
are cut to size. Straightening of bars shall be done cold and without damaging the
bars.
b. All bars shall be accurately bent according to the sizes and shapes. They shall
be bent gradually by machine or other approved means. Reinforcing bars shall not
be straightened and in a manner that will injure the material; bars containing cracks
or splits shall be rejected. They shall be bend cold, except bars or over 25mm in
diameter which may be bent hot if specifically approved by the Engineer. Bars,
which depend for their strength on cold working, shall not be bent hot. Bars bent
hot shall not be treated beyond cherry red colour (not exceeding 845C) and after
bending shall be allowed to cool slowly without quenching. Bars incorrectly bent
shall be used only if the means used for straightening and rebending be such as shall
not, in the opinion of the Engineer, injure the material. No reinforcement shall be
bent when in position in the work without approval, whether or not it is partially
embedded in hardened concrete. Bars having kinks or bends other than those
required by design shall not be used.
9.8 Fixing.
Reinforcement shall be accurately fixed by any approved means and maintained in
the correct position by the use of blocks, spacers and chairs, as per IS:2502, to
prevent displacement during placing and compaction of concrete. Bars intended to
be in contact at crossing points shall be securely bound together at all such points
with number 16 gauge annealed soft iron wire. The vertical distances required
between successive layers of bars in beams or similar members shall be maintained
by the provision of mild steel spacer bars at such intervals that the main bars do no
perceptibly sag between adjacent spacer bars.
GTS : General Technical Specification. Page 73