Laying of NP4 Hume Pipe

Taking out existing CC interlocking paver blocks from road, including removal of rubbish, disposal of unserviceable material (paid separately in A3) and stacking of serviceable material within 50 m lead for re-use in G1. Area = 140x2.30 = 322.00 Sqm (20% of 700 m)

Demolishing CC road pavement (1:2:4, 200mm thick) by mechanical means, disposal up to 1 km. Vol = 560x2.30x0.20 = 257.6 CUM (80% of 700 m)

Disposal of demolished CC pavement debris by mechanical means, loading, transporting to approved dumping ground beyond 50 m initial lead, all leads and lifts. Assumed fully unserviceable (100% of A2 volume) = 257.60 CUM.

Earth work in excavation by mechanical means (Hydraulic excavator)/manual means over areas exceeding 1.5 m in width and 10 sqm on plan (bulk trench excavation — DSR item 2.10 series covers pipes only upto 600mm dia, not applicable for 1200mm; general earthwork excavation item used instead), all kinds of soil, for all lift, lead upto 50m, getting out and disposal of excavated earth. Vol = 700x2.30x3.78 = 6,077.75 CUM.

Close timbering in trenches including strutting, shoring and packing cavities wherever required, DEPTH NOT EXCEEDING 1.5 m. Measurement: face area timbered (both walls). Entire 700m has min. depth 3.50m (>1.5m), so full length applies. Area = 2 walls x 700 m x 1.5 m = 2,100.00 Sqm.

Close timbering in trenches — DEPTH EXCEEDING 1.5 m BUT NOT EXCEEDING 3.0 m. Entire 700m has min. depth 3.50m (>3.0m), so full length applies. Area = 2 walls x 700 m x 1.5 m = 2,100.00 Sqm.

Close timbering in trenches — DEPTH EXCEEDING 3.0 m BUT NOT EXCEEDING 4.5 m. This layer thickness varies linearly from 0.50 m (Ch.0, depth 3.50m) to 1.05 m (Ch.700, depth 4.05m); avg = 0.775 m; applies for entire 700m (min depth 3.50m > 3.0m throughout). Area = 2 x 700 m x 0.775 m = 1,085.00 Sqm.

Pumping out water caused by sub-soil springs and seepage during trench excavation and pipe laying. Estimated volume = trench below water table (assumed at 3.0m depth, same assumption as reference BOQ): 2.30 x 700 x 0.775(avg) = 1,247.75 kL. Actual quantity to be measured and certified by EIC.

PCC 1:3:6 (M-10) bedding 200mm thick (assumed = pipe dia/6, per common design practice for larger dia pipes; reference BOQ used 150mm for 600mm dia), full trench width 2.30m. Vol = 700x2.30x0.15 = 241.50 CUM.

Supply, laying, jointing (CM 1:2) and hydraulic testing of 1200mm NP-4 RCC Hume Sewer Pipe IS:458-2003, ISI marked. Combined rate includes factory supply, transport, lowering by crane, laying, jointing and testing. Qty = 700 Rm.