Volume-IF - JantERmantER

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DCPl-K9A01
additional safety another inner cover or other approved methods may be
adopted. The manhole cover shall be distinctively coded to indicate the type
of drainage involved.
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·3.6.0 Root Drainage
3.6.1 ·General
3.6.2 Pipe Joints
Inside manholes necesS!lry channels and benchings finished smooth by neat
cement in cement concrete (1:2:4) and foot rungs made from 20mm round
bars at 300mm centres and staggered shOuld be provided. Rungs should
project 100mm from wall face and be embedded 200mm Inside cement
concrete block made In that location of brick work. These foot rests shall be
painted with coal tar in 'the projected portions and cement slurry In the
embedded parl Joint of any pipe with brick work shall be rendered perfectly
leak proof.
Pipes and fittings in the connection pipe to the main drainage system shan be
vitrItIed clayware conforming to relevant IS and laid to the line and level
indicated In the drawi"lls.
Rainwater ouUets and down comers to run along inner face of stack wall. shall be
made of standard cast Iron rainwater pipes confonning to IS:1230. The brackets
used to hold the pipes alongside the walls shall be wrought iron clevis type. split
ring type or of perforated strap fron as approved by the Engineer. Each vertical
pipe shall hang freely on Its bracket fixed just below the socket Suitable spacer
blocks are to be kept in between the pipe and wall surface for fixing the pipe. All
bends and junctions shall be provided with water tight ciean-outs.
All joints between pipes. pipes and fittings and manholes shall be gas-tight
when above ground and water tight when under ground. Method of pipe
cutting and jointing shall be as per instruction of the pipe and fittings
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manufacturer or as approved by the Engineer. However folloWing guidelines
may be followed in absence of any Instruction available from the
manufacturer.
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sOcket arid Spigot 'pipes sh311 be pined'by cast lead jOintS. Spigot of the
following pipe should be centred In the SOCket d the preceding pipe by lightly
t> caulking in suffICIent turns of tarred gasket or hemp yam to have unfiUed half
the depth of SOCket After the gasket or hemp yam has been caulked lightl"
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a jointing ring shall be placed round the barrel and tightened against the face
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of the SOCket to prevent air lock. Molten lead shall then be placed round the
barrel and tightened against the face of the socket. Thereafter molten lead
should be poured in to fill the remainder of the .socket and caulked wiltl
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suitable tools tight round the joint to malee up for shrinkage of the molten
metal on cooling and should be finished 3mm behind the socket face. If any
Joint Is suspected to be damaged it has to be opened out & redone.
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Joints in cast iron pipes with special JOinting arrangements like "Tyton" joints
etc. shalt follow the instructions of the menufacturer.
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IJ (PCA.CO-003.S805CSA24.doC.doe) V.lI-D2IS·XXIV: 29
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