particular specifications (road works) - CIDCO Maharashtra Ltd.

CIDCO OF MAHARASHTRA LTD
C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 529
5.0 MORTAR LINING
The Contractor shall procure mortar lined D.I. Pipes from inside to
prevent corrosion from inside as well as to maintain minimum “C”
valve of 130. the rate for D.I. pipes also includes labour, material,
machinery, cost of SBR ring etc. in carrying out all operation of
mortar lining the pipes. The mortar lining shall conform to ISO
4179. The maximum size of sand shall be 2.5 mm and clay content
should be kept less than 2%. The proportion of cement and mortar
shall be 1:1.
5.1 The pipes and specials before laying shall be brushed internally
through out the length to remove any soil or stones that may have
accumulated therein. Inside of socket and outside of the spigot shall
be thoroughly cleaned.
5.2 The pipes shall be lowered in trenches carefully, in straight and in
full length as far as possible in accordance with IS 12888-1987.
Maximum deviation allowed will be 2 ½ % degree. Where site
condition demand D.I. Pipes and specials shall be allowed to be cut
to the required dimensions with the help of pipe cutting machineries
or by hand as may be directed by the Engineer.
5.3 (A) On lowering the pipe in trenches, they will have to be jointed
by means of styrene butadiene rings (SBR) conforming to
relevant I.S. Code.
(B) Jointing : Before assembling the joint, the spigot of pipe and
the interior of the socket of the adjacent pipe should be
thoroughly cleaned. Insertion of the SBR i.e. (rubber ring)
conforming to IS 5382 & IS 12820 can be facilitated by the
bulb eating inside the socket.