ABSTRACT
Extra for Type N sand bed 650× 100mm 0.04 2.56 3.60 1.74 m 7.90 Type T sand surround 650 wide×100mm 0.08 5.13 7.20 4.18 m 16.51 Type F granular bed 650×100mm 0.05 3.21 4.51 1.86 m 9.58 Type S granular surround 650 wide×100mm 0.16 10.26 14.39 4.44 m 29.09 Type A concrete bed 650×100mm 0.11 7.05 9.46 7.09 m 23.60 Type B 100mm concrete bed and haunch 0.24 15.39 20.63 6.06 m 42.08 Type Z concrete surround 650 wide×100mm 0.22 14.11 18.92 17.00 m 50.03
225mm dia. drain or sewer in trench, depth to invert average 1.50m deep 0.20 12.82 12.26 72.77 m 97.85 average 2.00m deep 0.24 15.39 21.02 72.77 m 109.18 average 2.50m deep 0.28 17.95 23.43 72.77 m 114.15 average 3.00m deep 0.35 22.44 30.23 72.77 m 125.44 average 3.50m deep 0.44 28.21 38.02 72.77 m 139.00 average 4.00m deep 0.56 35.91 48.39 72.77 m 157.07
hours £ £ £ rate £
Extra for Type N sand bed 750× 150mm 0.12 7.70 10.32 3.02 m 21.04 Type T sand surround 750 wide×150mm 0.24 15.39 20.63 7.46 m 43.48 Type F granular bed 750×150mm 0.13 8.34 11.18 3.20 m 22.72 Type S granular surround 750 wide × 150mm 0.24 15.39 20.63 7.93 m 43.95 Type A concrete bed 750×150mm 0.19 12.18 16.33 12.28 m 40.79 Type B 150mm concrete bed and haunch 0.29 18.60 24.94 9.46 m 53.00 Type Z concrete surround 750 wide×150mm 0.36 23.09 30.95 30.45 m 84.49
300mm dia. drain or sewer in trench, depth to invert average 1.50m deep 0.21 13.47 18.90 111.27 m 143.64 average 2.00m deep 0.26 16.67 22.80 111.27 m 150.74 average 2.50m deep 0.30 19.24 25.12 111.27 m 155.63 average 3.00m deep 0.37 23.73 32.02 111.27 m 167.02 average 4.00m deep 0.61 39.12 51.67 111.27 m 202.06 average 5.00m deep 1.01 64.77 85.88 111.27 m 261.92
Extra for Type N sand bed 800× 150mm 0.13 8.34 11.18 3.22 m 22.74 Type T sand surround 800×150mm 0.26 16.67 19.64 10.36 m 46.67 Type F granular bed 800×150mm 0.14 8.98 12.04 3.40 m 24.42 Type S granular surround 800 wide×150mm 0.26 16.67 22.36 10.81 m 49.84 Type A concrete bed 800×150mm 0.20 12.82 17.20 13.11 m 43.13 Type B 150mm concrete bed and haunch 0.36 23.09 30.95 11.94 m 65.98 Type Z concrete surround 800 wide×150mm 0.22 14.11 47.66 39.10 m 100.87
Vitrified clay pipes to BS 65, spigot and socket joints with sealing ring 400mm dia. drain or sewer in trench, depth to invert
average 2.00m deep 0.31 19.88 27.14 95.37 m 142.39 average 2.50m deep 0.35 22.44 29.27 95.37 m 147.08 average 3.00m deep 0.42 26.93 36.31 95.37 m 158.61 average 4.00m deep 0.66 42.32 55.90 95.37 m 193.59 average 5.00m deep 1.07 68.61 91.16 95.37 m 255.14 average 6.00m deep 1.85 118.63 157.67 95.37 m 371.67
Extra for Type N sand bed 900× 150mm 0.14 8.98 12.04 3.62 m 24.64 Type T sand surround 900 wide×150mm 0.28 17.95 24.07 14.82 m 56.84 Type F granular bed 900×150mm 0.15 9.62 12.89 3.87 m 26.38 Type S granular surround 900× 150mm 0.28 17.95 24.07 15.77 m 57.79 Type A concrete bed 900×150mm 0.21 13.47 18.06 14.72 m 46.25 Type B, 150mm concrete bed and haunch 0.43 27.57 36.97 15.73 m 80.27 Type Z concrete surround 900 wide×150mm 0.40 25.65 34.39 60.42 m 120.46
Concrete pipes with rebated flexible joints to BS 5911-1 450mm dia. piped culvert in trench, depth to invert
average 2.00m deep 0.33 21.16 28.92 27.07 m 77.15 average 3.00m deep 0.44 28.21 37.89 27.07 m 93.17 average 4.00m deep 0.72 46.17 60.72 27.07 m 133.96 average 6.00m deep 1.65 105.81 135.45 27.07 m 268.33
Extra for Type A concrete bed 1050×150mm 0.24 15.39 20.63 17.18 m 53.20 Type Z concrete surround 1050 wide× 150mm 0.45 28.86 38.69 76.99 m 144.54
hours £ £ £ rate £
DRAINS AND SERVICE DUCTS (EXCLUDING FILTER, NARROW FILTER DRAINS AND FIN DRAINS) – cont
Concrete pipes with rebated flexible joints to BS 5911-1 – cont 750mm dia. piped culvert in trench, depth to invert
average 2.00m deep 0.38 26.29 43.03 89.91 m 159.23 average 3.00m deep 0.52 35.98 58.26 89.91 m 184.15 average 4.00m deep 0.92 63.65 101.52 89.91 m 255.08 average 6.00m deep 2.05 141.84 220.88 89.91 m 452.63
Extra for Type A concrete bed 1250×150mm 0.26 17.99 22.36 23.79 m 64.14 Type Z concrete surround 1250 wide× 150mm 0.50 34.59 42.99 173.01 m 250.59
900mm dia. piped culvert in trench, depth to invert average 2.00m deep 0.43 29.75 48.65 120.64 m 199.04 average 3.00m deep 0.62 42.90 69.71 120.64 m 233.25 average 4.00m deep 1.06 73.34 116.91 120.64 m 310.89 average 6.00m deep 2.25 155.68 242.36 120.64 m 518.68
Extra for Type A concrete bed 1500×150mm 0.28 19.37 24.07 27.85 m 71.29 Type Z concrete surround 1500 wide× 150mm 0.55 38.05 47.29 240.57 m 325.91
Corrugated steel pipes galvanized, hot dip bitumen coated (Armco type) 1000mm dia. piped culvert in trench, Type S granular surround, depth to invert
average 2.00m deep 0.99 68.50 111.79 123.38 m 303.67 1600mm dia. piped culvert in trench, Type S granular surround, depth to invert
average 2.00m deep 2.13 147.37 240.58 201.49 m 589.44 2000mm dia. piped culvert in trench, Type S granular surround, depth to invert
average 3.00m deep 2.97 205.49 335.41 403.73 m 944.63 2200mm dia. piped culvert in trench, Type S granular surround, depth to invert
average 3.00m deep 3.29 227.63 371.39 456.18 m 1055.20
Clay cable ducts; Hepduct 100mm dia. service duct in trench, Type S granular surround, depth to invert
average 1.00m deep 0.14 8.98 11.93 18.14 m 39.05 Two 100mm dia. service ducts in trench, Type S granular surround, depth to invert
average 1.00m deep 0.24 15.39 20.69 36.06 m 72.14 Three 100mm dia. service ducts in trench, Type S granular surround, depth to invert
average 1.00m deep 0.32 20.52 27.42 52.65 m 100.59
hours £ £ £ rate £
Four 100mm dia. service ducts in trench, Type S granular surround, depth to invert
average 1.00m deep 0.40 25.65 34.39 71.79 m 131.83 Six 100mm dia. service ducts in trench, Type S granular surround, depth to invert
average 1.00m deep 0.60 38.48 51.35 101.76 m 191.59 Extra for
Type Z concrete surround on single duct 0.08 5.13 6.88 9.60 m 21.61 Type Z concrete surround on additional ways 0.08 5.13 6.88 9.60 m 21.61 150mm dia. conduit, per way 0.01 0.64 0.86 19.79 m 21.29 225mm dia. conduit, per way 0.01 0.64 0.86 55.06 m 56.56
FILTER DRAINS
Vitrified clay perforated pipes to BS 65, sleeved joints 150mm dia. filter drain in trench with Type A bed and Type A fill filter material
average 1.00m deep 0.26 16.67 21.75 39.66 m 78.08 average 2.00m deep 0.30 19.24 24.93 47.89 m 92.06 average 3.00m deep 0.35 22.44 30.69 56.12 m 109.25
150mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.26 16.67 21.75 48.20 m 86.62 average 2.00m deep 0.30 19.24 24.93 64.39 m 108.56 average 3.00m deep 0.35 22.44 30.69 80.50 m 133.63
225mm pipes with Type A bed and Type A fill, depth average 1.00m deep 0.27 17.31 21.83 68.85 m 107.99 average 2.00m deep 0.31 19.88 25.54 78.92 m 124.34 average 3.00m deep 0.36 23.09 30.29 88.25 m 141.63
225mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.27 17.31 21.83 77.73 m 116.87 average 2.00m deep 0.31 19.88 25.54 97.10 m 142.52 average 3.00m deep 0.36 23.09 30.29 115.58 m 168.96
300mm pipes with Type A bed and Type A fill, depth average 1.00m deep 0.28 17.95 22.59 127.45 m 167.99 average 2.00m deep 0.32 20.52 26.63 139.01 m 186.16 average 3.00m deep 0.37 23.73 30.91 150.03 m 204.67
300mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.28 17.95 22.59 135.11 m 175.65 average 2.00m deep 0.32 20.52 26.63 156.84 m 203.99 average 3.00m deep 0.37 23.73 30.91 178.34 m 232.98
Concrete porous pipe BS 5911-114, sleeved joints 150mm pipes with Type A bed and Type A fill, depth
average 1.00m deep 0.26 16.67 21.75 17.43 m 55.85 average 2.00m deep 0.30 19.24 24.93 25.65 m 69.82 average 3.00m deep 0.35 22.44 30.69 33.89 m 87.02
hours £ £ £ rate £
FILTER DRAINS – cont
Concrete porous pipe BS 5911-114, sleeved joints – cont 150mm pipes with Type A bed and Type B fill, depth
average 1.00m deep 0.26 16.67 21.75 25.97 m 64.39 average 2.00m deep 0.30 19.24 24.93 42.15 m 86.32 average 3.00m deep 0.35 22.44 30.69 58.26 m 111.39
225mm pipes with Type A bed and Type A fill, depth average 1.00m deep 0.27 17.31 21.83 20.13 m 59.27 average 2.00m deep 0.31 19.88 25.54 30.20 m 75.62 average 3.00m deep 0.36 23.09 30.29 39.53 m 92.91
225mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.27 17.31 21.83 29.01 m 68.15 average 2.00m deep 0.31 19.88 25.54 48.37 m 93.79 average 3.00m deep 0.36 23.09 30.29 66.86 m 120.24
300mm pipes with Type A bed and Type A fill, depth average 1.00m deep 0.28 17.95 22.59 23.48 m 64.02 average 2.00m deep 0.32 20.52 26.63 35.03 m 82.18 average 3.00m deep 0.37 23.73 30.91 46.06 m 100.70
300mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.28 17.95 22.59 31.13 m 71.67 average 2.00m deep 0.32 20.52 26.63 52.87 m 100.02 average 3.00m deep 0.37 23.73 30.91 74.37 m 129.01
Filter material contiguous with filter drains, subbase material and lightweight aggregate infill Type A 0.07 4.49 4.80 18.56 m3 27.85 Type B 0.07 4.49 5.22 36.82 m3 46.53
Excavate and replace filter material contiguous with filter drain Type A 0.47 14.75 23.16 18.56 m3 56.47 Type B 0.47 14.75 23.16 36.82 m3 74.73
FIN DRAINS AND NARROW FILTER DRAINS
Fin Drain DfT type 6 using ‘Trammel’ drainage fabrics and perforated clay drain; surrounding pipe with sand and granular fill 100mm clay perforated pipes, depth
average 1.00m deep 0.17 10.90 15.02 22.90 m 48.82 average 2.00m deep 0.23 14.75 20.24 29.47 m 64.46
Fin Drain DfT type 7 using ‘Trammel’ drainage fabrics and slotted uPVC drain; surrounding pipe with sand and granular fill, backfilling with selected suitable material 100mm uPVC slotted pipes, depth
average 1.00m deep 0.17 10.90 15.02 25.92 m 51.84 average 2.00m deep 0.23 14.75 20.24 32.49 m 67.48
hours £ £ £ rate £
Narrow Filter Drain DfT type 8 using ‘Trammel’ drainage fabrics and perforated uPVC drain; surrounding pipe with sand and granular fill, backfilling with granular material 110mm uPVC perforated pipes, depth
average 1.00m deep 0.17 10.90 15.02 16.68 m 42.60 average 2.00m deep 0.22 14.11 19.52 20.57 m 54.20
Narrow Filter Drain DfT type 9 using ‘Trammel’ drainage fabrics and perforated uPVC drain; surrounding pipe with sand and granular fill, backfilling with granular material 110mm uPVC perforated pipes, depth
average 1.00m deep 0.17 10.90 15.02 19.00 m 44.92 average 2.00m deep 0.23 14.75 20.24 24.89 m 59.88
CONNECTIONS Note: excavation presumed covered by new trench Connection of pipe to existing drain, sewer or piped culvert
150mm 0.42 26.93 25.33 37.94 nr 90.20 225mm 0.60 38.48 43.71 141.94 nr 224.13 300mm 1.15 73.74 87.63 246.99 nr 408.36
Connection of pipes to existing chambers 150mm to one brick 1.20 76.95 105.77 4.95 nr 187.67 150mm to precast 0.60 38.48 52.85 4.95 nr 96.28 300mm to one and a half brick 2.40 153.90 211.30 8.08 nr 373.28
CHAMBERS AND GULLIES
Notes The rates assume the most efficient items of plant (excavator) and are optimum rates, assuming continuous output with no delays caused by other operations or works. Ground conditions are assumed to be good soil with no abnormal conditions that would affect outputs and consistency of work. Multiplier Table for Labour and Plant for various site conditions and for working:
out of sequence with other works × 2.75minimum in hard clay × 1.75-2.00 in running sand×2.75minimum in broken rock× 2.75-3.50 below water table × 2.00minimum
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Brick construction Design criteria used in models:
class A engineering bricks 215 thick walls generally; 328 thick to chambers exceeding 2.5m deep 225 plain concrete C20/20 base slab 300 reinforced concrete C20/20 reducing slab 125 reinforced concrete C20/20 top slab maximum height of working chamber 2.0m above benching 750× 750 access shaft plain concrete C15/20 benching, 150 clay main channel longitudinally and two 100 branch channels step irons at 300mm centres, doubled if depth to invert exceeds 3000mm heavy duty manhole cover and frame
750×700 chamber 500 depth to invert excavation, support, backfilling and disposal 28.56 concrete base 81.60 brickwork chamber 254.80 concrete cover slab 81.60 concrete benching, main and branch channels 20.40 step irons 15.30 access cover and frame 357.00 TOTAL £ 839.26
750×700 chamber 1000 depth to invert excavation, support, backfilling and disposal 61.20 concrete base 81.60 brickwork chamber 514.80 concrete cover slab 81.60 concrete benching; main and branch channels 20.40 step irons 25.50 access cover and frame 357.00 TOTAL £ 1142.10
750×700 chamber 1500 depth to invert excavation, support, backfilling and disposal 82.36 concrete base 81.60 brickwork chamber 774.80 concrete cover slab 81.60 concrete benching; main and branch channels 20.40 step irons 45.90 access cover and frame 357.00 TOTAL £ 1443.66
900×700 chamber 500 depth to invert excavation, support, backfilling and disposal 35.70 concrete base 102.00 brickwork chamber 275.60 concrete cover slab 102.00 concrete benching; main and branch channels 30.60 step irons 15.30
hours £ £ £ rate £
access cover and frame 357.00 TOTAL £ 918.20
900×700 chamber 1000 depth to invert excavation, support, backfilling and disposal 66.30 concrete base 102.00 brickwork chamber 556.40 concrete cover slab 102.00 concrete benching; main and branch channels 30.60 step irons 25.50 access cover and frame 357.00 TOTAL £ 1239.80
900×700 chamber 1500 depth to invert excavation, support, backfilling and disposal 112.45 concrete base 102.00 brickwork chamber 832.00 concrete cover slab 102.00 concrete benching; main and branch channels 30.60 step irons 45.90 access cover and frame 357.00 TOTAL £ 1581.95
1050×700 chamber 1500 depth to invert excavation, support, backfilling and disposal 144.33 concrete base 112.20 brickwork chamber 889.20 concrete cover slab 117.30 concrete benching; main and branch channels 33.15 step irons 45.90 access cover and frame 357.00 TOTAL £ 1699.08
1050×700 chamber 2500 depth to invert excavation, support, backfilling and disposal 260.10 concrete base 112.20 brickwork chamber 1482.00 concrete cover slab 117.30 concrete benching; main and branch channels 33.15 step irons 84.15 access cover and frame 357.00 TOTAL £ 2445.90
1050×700 chamber 3500 depth to invert excavation, support, backfilling and disposal 357.00 concrete base 112.20 brickwork chamber 2074.80 concrete reducing slab 142.80 brickwork access shaft 2121.60 concrete cover slab 81.60 concrete benching; main and branch channels 33.15 step irons 112.20 access cover and frame 357.00 TOTAL £ 5392.35
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Brick construction – cont 1350×700 chamber 2500 depth to invert
excavation, support, backfilling and disposal 314.16 concrete base 142.80 brickwork chamber 1664.00 concrete cover slab 142.80 concrete benching; main and branch channels 40.80 step irons 84.15 access cover and frame 357.00 TOTAL £ 2745.71
1350×700 chamber 3500 depth to invert excavation, support, backfilling and disposal 438.60 concrete base 142.80 brickwork chamber 2340.00 concrete reducing slab 153.00 brickwork access shaft 2121.60 concrete cover slab 81.60 concrete benching; main and branch channels 40.80 step irons 112.20 access cover and frame 357.00 TOTAL £ 5787.60
1350×700 chamber 4500 depth to invert excavation, support, backfilling and disposal 561.00 concrete base 142.80 brickwork chamber 3010.80 concrete reducing slab 153.00 brickwork access shaft 2771.60 concrete cover slab 81.60 concrete benching; main and branch channels 40.80 step irons 147.90 access cover and frame 357.00 TOTAL £ 7266.50
Precast concrete construction Design criteria used in models: * circular shafts * 150 plain concrete surround * 225 plain concrete C20/20 base slab * precast reducing slab * precast top slab * maximum height of working chamber 2.0m above benching
* 750 dia. access shaft * plain concrete C15/20 benching, 150 clay main channel longitudinally and two 100 branch channels
* step irons at 300mm centres, doubled if depth to invert exceeds 3000mm
* heavy duty manhole cover and frame * in manholes over 6m deep, landings at maximum intervals
hours £ £ £ rate £
675 dia. × 500 depth to invert excavation, support, backfilling and disposal 27.54 concrete base 51.00 main chamber rings 20.40 cover slab 45.90 concrete surround 51.00 concrete benching, main and branch channels 12.34 step irons 15.30 access cover and frame 357.00 TOTAL £ 580.48
675 dia. × 750 depth to invert excavation, support, backfilling and disposal 35.70 concrete base 51.00 main chamber rings 25.50 cover slab 45.90 concrete surround 71.40 concrete benching, main and branch channels 12.34 step irons 20.40 access cover and frame 357.00 TOTAL £ 619.24
675 dia. × 1000 depth to invert excavation, support, backfilling and disposal 43.35 concrete base 51.00 main chamber rings 33.15 cover slab 45.90 concrete surround 102.00 concrete benching, main and branch channels 12.34 step irons 25.50 access cover and frame 357.00 TOTAL £ 670.24
675 dia. × 1250 depth to invert excavation, support, backfilling and disposal 53.04 concrete base 51.00 main chamber rings 38.25 cover slab 45.90 concrete surround 122.40 concrete benching, main and branch channels 12.34 step irons 32.64 access cover and frame 357.00 TOTAL £ 712.57
900 dia. × 750 depth to invert excavation, support, backfilling and disposal 117.30 concrete base 102.00 main chamber rings 42.13 cover slab 61.20 concrete surround 102.00 concrete benching, main and branch channels 21.93 step irons 20.40 access cover and frame 357.00 TOTAL £ 823.96
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Precast concrete construction – cont 900 dia. × 1000 depth to invert
excavation, support, backfilling and disposal 153.00 concrete base 102.00 main chamber rings 56.17 cover slab 61.20 concrete surround 132.60 concrete benching, main and branch channels 21.93 step irons 25.50 access cover and frame 357.00 TOTAL £ 909.40
900 dia. × 1500 depth to invert excavation, support, backfilling and disposal 219.30 concrete base 102.00 main chamber rings 66.37 cover slab 61.20 concrete surround 193.80 concrete benching, main and branch channels 21.93 step irons 45.90 access cover and frame 357.00 TOTAL £ 1067.50
1200 dia. × 1500 depth to invert excavation, support, backfilling and disposal 280.50 concrete base 173.40 main chamber rings 137.70 cover slab 79.56 concrete surround 265.20 concrete benching, main and branch channels 38.91 step irons 45.90 access cover and frame 357.00 TOTAL £ 1378.17
1200 dia. × 2000 depth to invert excavation, support, backfilling and disposal 387.60 concrete base 173.40 main chamber rings 183.60 cover slab 79.56 concrete surround 346.80 concrete benching, main and branch channels 38.91 step irons 61.20 access cover and frame 357.00 TOTAL £ 1628.07
1200 dia. × 2500 depth to invert excavation, support, backfilling and disposal 459.00 concrete base 173.40 main chamber rings 229.50 cover slab 79.56 concrete surround 438.60 concrete benching, main and branch channels 38.91 step irons 76.50
hours £ £ £ rate £
access cover and frame 357.00 TOTAL £ 1852.47
1200 dia. × 3000 depth to invert excavation, support, backfilling and disposal 566.10 concrete base 173.40 main chamber rings 275.40 cover slab 79.56 concrete surround 520.20 concrete benching, main and branch channels 38.91 step irons 91.80 access cover and frame 357.00 TOTAL £ 2102.37
1800 dia. × 1500 depth to invert excavation, support, backfilling and disposal 423.30 concrete base 387.60 main chamber rings 413.10 cover slab 219.30 concrete surround 387.60 concrete benching, main and branch channels 87.57 step irons 45.90 access cover and frame 357.00 TOTAL £ 2321.37
1800 dia. × 2000 depth to invert excavation, support, backfilling and disposal 566.10 concrete base 387.60 main chamber rings 550.80 cover slab 219.30 concrete surround 520.20 concrete benching, main and branch channels 87.57 step irons 61.20 access cover and frame 357.00 TOTAL £ 2749.77
1800 dia. × 2500 depth to invert excavation, support, backfilling and disposal 663.00 concrete base 387.60 main chamber rings 688.50 cover slab 219.30 concrete surround 652.80 concrete benching, main and branch channels 87.57 step irons 76.50 access cover and frame 357.00 TOTAL £ 3132.27
1800 dia. × 3000 depth to invert excavation, support, backfilling and disposal 846.60 concrete base 387.60 main chamber rings 831.30 cover slab 219.30 concrete surround 785.40 concrete benching, main and branch channels 87.57 step irons 91.80 access cover and frame 357.00 TOTAL £ 3606.57
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Precast concrete construction – cont 1800 dia. × 3500 depth to invert
excavation, support, backfilling and disposal 969.00 concrete base 387.60 main chamber rings 969.00 reducing slab 256.02 access shaft 306.00 cover slab 61.20 concrete surround 918.00 concrete benching, main and branch channels 87.57 step irons 117.30 access cover and frame 357.00 TOTAL £ 4428.69
1800 dia. × 4000 depth to invert excavation, support, backfilling and disposal 1122.00 concrete base 387.60 main chamber rings 1076.10 reducing slab 256.02 access shaft 351.90 cover slab 61.20 concrete surround 1050.60 concrete benching, main and branch channels 87.57 step irons 127.50 access cover and frame 357.00 TOTAL £ 4877.49
2400 dia. × 1500 depth to invert excavation, support, backfilling and disposal 581.40 concrete base 693.60 main chamber rings 1055.70 cover slab 627.30 concrete surround 520.20 concrete benching, main and branch channels 158.10 step irons 45.90 access cover and frame 357.00 TOTAL £ 4039.20
2400 dia. × 3000 depth to invert excavation, support, backfilling and disposal 1162.80 concrete base 693.60 main chamber rings 2116.50 cover slab 627.30 concrete surround 1050.60 concrete benching, main and branch channels 158.10 step irons 91.80 access cover and frame 357.00 TOTAL £ 6257.70
2400 dia. × 4500 depth to invert excavation, support, backfilling and disposal 1530.00 concrete base 693.60 main chamber rings 3162.00
hours £ £ £ rate £
reducing slab 719.10 access shaft 392.70 cover slab 61.20 concrete surround 1570.80 concrete benching, main and branch channels 158.10 step irons 149.94 access cover and frame 357.00 TOTAL £ 8794.44
2700 dia. × 1500 depth to invert excavation, support, backfilling and disposal 663.00 concrete base 887.40 main chamber rings 1224.00 cover slab 1122.00 concrete surround 591.60 concrete benching, main and branch channels 198.90 step irons 45.90 access cover and frame 357.00 TOTAL £ 5089.80
2700 dia. × 3000 depth to invert excavation, support, backfilling and disposal 1336.20 concrete base 887.40 main chamber rings 2448.00 cover slab 1122.00 concrete surround 1173.00 concrete benching, main and branch channels 198.90 step irons 91.80 access cover and frame 357.00 TOTAL £ 7614.30
2700 dia. × 4500 depth to invert excavation, support, backfilling and disposal 1938.00 concrete base 887.40 main chamber rings 3570.00 reducing slab 1178.10 access shaft 392.70 cover slab 61.20 concrete surround 1764.60 concrete benching, main and branch channels 198.90 step irons 149.94 access cover and frame 357.00 TOTAL £ 10497.84
3000 dia. × 3000 depth to invert excavation, support, backfilling and disposal 1530.00 concrete base 1091.40 main chamber rings 3442.50 cover slab 1239.30 concrete surround 1305.60 concrete benching, main and branch channels 244.80 step irons 91.80 access cover and frame 357.00 TOTAL 9302.40
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Precast concrete construction – cont 3000 dia. × 4500 depth to invert
excavation, support, backfilling and disposal 2295.00 concrete base 1091.40 main chamber rings 4590.00 reducing slab 1530.00 access shaft 392.70 cover slab 61.20 concrete surround 1958.40 concrete benching, main and branch channels 244.80 step irons 149.94 access cover and frame 357.00 TOTAL 12670.44
3000 dia. × 6000 depth to invert excavation, support, backfilling and disposal 3060.00 concrete base 1091.40 main chamber rings 6834.00 reducing slab 1530.00 access shaft 525.30 cover slab 61.20 concrete surround 2611.20 concrete benching, main and branch channels 244.80 step irons 178.50 access cover and frame 357.00 TOTAL 16493.40
Clayware vertical pipe complete with rest bend at base and tumbling bay junction to main drain complete with stopper; concrete grade C20surround, 150mm thick; additional excavation and disposal 100 pipe
1.15m to invert nr 112.20 2.15m to invert nr 142.80 3.15m to invert nr 168.30 4.15m to invert nr 204.00
150 pipe 1.15m to invert nr 168.30 2.15m to invert nr 209.10 3.15m to invert nr 246.84 4.15m to invert nr 290.70
225 pipe 1.15m to invert nr 341.70 2.15m to invert nr 382.50 3.15m to invert nr 433.50 4.15m to invert nr 504.90
hours £ £ £ rate £
Vitrified clay; set in concrete grade C20, 150mm thick; additional excavation and disposal Road gulley
450mm dia. × 900mm deep, 100mm or 150mm outlet; cast iron road gulley grating and frame group 4, 434× 434mm, on Class B engineering brick seating 0.50 23.62 1.00 565.78 nr 590.40
Yard gulley (mud); trapped with rodding eye; galvanized bucket; stopper
225mm dia., 100mm dia. outlet, cast iron hinged grate and frame 0.30 14.17 0.63 496.99 nr 511.79
Grease interceptors; internal access and bucket 600× 450mm, metal tray and lid, square hopper with horizontal inlet 0.35 16.54 0.70 1570.18 nr 1587.42
Precast concrete; set in concrete grade C20P, 150mm thick; additional excavation and disposal Road gulley; trapped with rodding eye; galvanized bucket; stopper
450mm dia. × 900mm deep, cast iron road gulley grating and frame group 4, 434×434mm, on Class B engineering brick seating 0.54 25.51 1.08 496.40 nr 522.99
SOFT SPOTS AND OTHER VOIDS Excavation of soft spots and other voids in bottom of trenches, chambers and gullies 0.07 4.49 5.95 – m3 10.44 Filling of soft spots and other voids in bottom of trenches, chambers and gullies with imported selected sand 0.09 5.77 7.32 26.14 m3 39.23 Filling of soft spots and other voids in bottom of trenches, chambers and gullies with imported natural gravel 0.09 5.77 7.32 31.05 m3 44.14 Filling of soft spots and other voids in bottom of trenches, chambers and gullies with concrete Grade C15, 40mm aggregate 0.09 5.77 7.25 84.17 m3 97.19 Filling of soft spots and other voids in bottom of trenches, chambers and gullies with concrete Grade C20, 20mm aggregate 0.09 5.77 7.25 86.50 m3 99.52
SUPPORTS LEFT IN EXCAVATION Timber closeboarded supports left in
trench – – 7.65 – m2 7.65 pits – – 7.65 – m2 7.65
Steel trench sheeting supports left in trench – – 35.70 – m2 35.70 pits – – 35.70 – m2 35.70
hours £ £ £ rate £
RENEWAL, RAISING OR LOWERING OF COVERS AND GRATINGS ON EXISTING CHAMBERS Raising the level of 100×100mm water stop tap boxes on 100×100mm brick chambers
by 150mm or less 0.06 2.83 0.43 26.00 nr 29.26 Lowering the level of 100×100mm water stop tap boxes on 100×100mm brick chambers
by 150mm or less 0.04 1.89 0.28 13.00 nr 15.17 Raising the level of 420×420mm cover and frame on 420×420mm in situ concrete chamber
by 150mm or less 0.10 4.72 0.71 28.05 nr 33.48 Lowering the level of 420×420mm British Telecom cover and frame on 420×420mm in situ concrete chamber
by 150mm or less 0.08 3.54 2.42 16.83 nr 22.79 Raising the level of 700×500mm cover and frame on 700×500mm in situ concrete chamber
by 150mm or less 0.17 8.03 1.19 38.25 nr 47.47 Raising the level of 600×600mm grade A heavy duty manhole cover and frame on 600× 600mm brick chamber
by 150mm or less 0.17 8.03 1.19 31.20 nr 40.42 by 150-300mm 0.21 9.92 1.47 35.88 nr 47.27
Lowering the level of 600×600mm grade A heavy duty manhole cover and frame on 600× 600mm brick chamber
by 150mm or less 0.10 4.72 0.71 17.84 nr 23.27
REMOVE FROM STORE AND REINSTALL COVERS 600×600mm; Group 5; super heavy duty E600 cast iron 0.25 11.81 0.57 205.63 nr 218.01 600×600mm; Group 4; heavy duty triangular D400 cast iron 0.25 11.81 0.57 208.69 nr 221.07 600×600×75mm; Group 2; light duty single seal B125 cast iron 0.25 11.81 0.57 217.11 nr 229.49 600×600×100mm; Group 2; medium duty single seal B125 cast iron 0.25 11.81 0.57 245.41 nr 257.79
GROUTING UP OF EXISTING DRAINS AND SERVICE DUCTS
Concrete Grade C15 Sealing redundant road gullies 0.02 0.94 0.11 13.25 m3 14.30 Filling redundant chambers with
ne 1.0m deep to invert 0.09 5.77 5.63 53.15 nr 64.55 1.0-2.0m deep to invert 0.21 13.47 13.13 85.90 nr 112.50 2.0-3.0m deep to invert 0.55 35.27 34.37 143.14 nr 212.78
hours £ £ £ rate £
Grouting up of existing drains and service ducts 100mm dia. 0.03 1.92 1.90 3.40 m 7.22 300mm dia. 0.13 8.34 8.26 14.64 m 31.24 450mm dia. 0.26 16.67 16.52 30.32 m 63.51 600mm dia. 0.50 32.06 31.76 61.53 m 125.35 1200mm dia. 1.70 109.01 107.95 171.98 m 388.94
EXCAVATION IN HARD MATERIAL Extra over excavation for excavation in Hard Material in drainage:
existing pavement, brickwork, concrete, masonry and the like 0.15 9.62 13.04 – m3 22.66 rock 0.35 22.44 30.43 – m3 52.87 reinforced concrete 0.60 38.48 54.47 – m3 92.95
Reinstatement of pavement construction; extra over excavation for breaking up and subsequently reinstating 150mm flexible surfacing and 280mm subbase
100mm dia. sewer, drain or service duct 0.09 5.77 8.13 14.19 m 28.09 150mm dia. sewer, drain or service duct 0.10 6.41 9.04 15.13 m 30.58 225mm dia. sewer, drain or service duct 0.10 6.41 9.04 16.55 m 32.00 300mm dia. sewer, drain or service duct 0.10 6.41 9.04 17.02 m 32.47 375mm dia. sewer, drain or service duct 0.10 6.41 9.04 17.49 m 32.94 450mm dia. sewer, drain or service duct 0.12 7.70 9.91 18.44 m 36.05 2 way 100mm dia. service ducts 0.10 6.41 9.04 14.66 m 30.11 3 way 100mm dia. service ducts 0.10 6.41 9.04 15.13 m 30.58 4 way 100mm dia. service ducts 0.10 6.41 9.04 16.55 m 32.00
MANHOLES
Materials In order to arrive at an all-in rate for enumerated manholes the various constituent elements have been broken down and unit rates given against each item.
