Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

on each horizontal rail which is fixed at true level. All inverts shall be laid therefrom with the help of proper boning rods.11.6.8 Cutting of pipes: The cutting of pipe for inserting, fittings or closure pieces shallbe done in a neat and workmanlike manner without damage to the pipe orcement lining so as to leave smooth and at right angles to the axis of the pipe.11.6.9 Pipelines Crossing Railway Lines: Irrigation channels or similar works theadministrative authority should consult the appropriate authorities beforepreparing plans and specification for this part of work.11.6.10 Connection to an Existing sewer: The connection to an existing sewer shall bedone through manholes.11.6.11 Connection to manholes: Before connecting a pipe to a manhole, a relievingarch or any other similar protection device should be made in the manhole forthe safety of the pipe.11.6.12 Strength and loading of stone ware pipes : The superimposed load should notnormally exceed 1600 kg per meter length, which is the minimum crushingstrength specified in IS: 651. The superimposed load on a laid pipe may beW = C w B²WhereW= Load on pipe in kilogram/linear meter.C= coefficient which depends upon the ratio of depth of trench to the trench width11.3.W= weight of filling materials in kg/m³ given in table 11.4.B= width of trench in meters.Ratio of Depth toTrench WidthTable 11.3Sand And DampTop- SoilSaturatedTopsoilDamp Clay1 2 3 4 50.5 0.46 0.46 0.47 0.471.0 0.85 0.86 0.88 0.901.5 1.18 1.21 1.24 1.282.0 1.46 1.50 1.56 1.622.5 1.70 1.76 1.84 1.923.0 1.90 1.98 2.08 2.203.5 2.08 2.17 2.30 2.444.00 2.22 2.83 2.49 2.664.5 2.34 2.47 2.65 2.875.0 2.45 2.59 2.80 3.03SaturatedClayUrban Administration & Development Department Page 132