ABSTRACT
Extra for Type N sand bed 650 × 100mm 0.04 2.49 2.31 1.22 m 6.02 Type T sand surround 650 wide × 100mm 0.08 4.98 4.62 2.93 m 12.53 Type F granular bed 650 × 100mm 0.05 3.11 2.90 1.77 m 7.78 Type S granular surround 650 wide × 100mm 0.16 9.96 9.24 4.24 m 23.44 Type A concrete bed 650 × 100mm 0.11 6.85 5.89 6.75 m 19.49 Type B 100mm concrete bed and haunch 0.24 14.94 12.86 5.76 m 33.56 Type Z concrete surround 650 wide × 100mm 0.22 13.70 11.79 16.17 m 41.66
hours £ £ £ rate £
DRAINS AND SERVICE DUCTS (EXCLUDING FILTER, NARROW FILTER AND FIN DRAINS) – cont
Vitrified clay pipes to BS 65, plain ends with push-fit polypropylene flexible couplings – cont 225mm diameter drain or sewer in trench, depth to invert
average 1.50m deep 0.20 12.45 7.27 34.12 m 53.84 average 2.00m deep 0.24 14.94 13.86 34.12 m 62.92 average 2.50m deep 0.28 17.43 16.11 34.12 m 67.66 average 3.00m deep 0.35 21.79 20.13 34.12 m 76.04 average 3.50m deep 0.44 27.39 25.31 34.12 m 86.82 average 4.00m deep 0.56 34.86 32.21 34.12 m 101.19
Extra for Type N sand bed 750 × 150mm 0.12 7.47 6.43 2.12 m 16.02 Type T sand surround 750 wide × 150mm 0.24 14.94 12.86 5.23 m 33.03 Type F granular bed 750 × 150mm 0.13 8.09 6.97 3.05 m 18.11 Type S granular surround 750 wide × 150mm 0.24 14.94 12.86 7.56 m 35.36 Type A concrete bed 750 × 150mm 0.19 11.83 10.18 11.69 m 33.70 Type B 150mm concrete bed and haunch 0.29 18.05 15.54 9.00 m 42.59 Type Z concrete surround 750 wide × 150mm 0.36 22.41 19.29 28.97 m 70.67
300mm diameter drain or sewer in trench, depth to invert
average 1.50m deep 0.21 13.07 12.14 45.37 m 70.58 average 2.00m deep 0.26 16.19 15.03 45.37 m 76.59 average 2.50m deep 0.30 18.68 17.27 45.37 m 81.32 average 3.00m deep 0.37 23.03 21.33 45.37 m 89.73 average 4.00m deep 0.61 37.97 35.11 45.37 m 118.45 average 5.00m deep 1.01 62.87 58.05 45.37 m 166.29
Extra for Type N sand bed 800 × 150mm 0.13 8.09 6.97 2.26 m 17.32 Type T sand surround 800 × 150mm 0.26 16.19 13.60 7.27 m 37.06 Type F granular bed 800 × 150mm 0.14 8.72 7.50 3.24 m 19.46 Type S granular surround 800 wide × 150mm 0.26 16.19 13.93 10.30 m 40.42 Type A concrete bed 800 × 150mm 0.20 12.45 10.72 12.47 m 35.64 Type B 150mm concrete bed and haunch 0.36 22.41 19.29 11.36 m 53.06 Type Z concrete surround 800 wide × 150mm 0.22 13.70 34.94 37.20 m 85.84
Vitrified clay pipes to BS 65, spigot and socket joints with sealing ring 400mm diameter drain or sewer in trench, depth to invert
average 2.00m deep 0.31 19.30 17.89 82.91 m 120.10 average 2.50m deep 0.35 21.79 20.12 82.91 m 124.82 average 3.00m deep 0.42 26.15 24.18 82.91 m 133.24 average 4.00m deep 0.66 41.09 37.99 82.91 m 161.99 average 5.00m deep 1.07 66.61 61.56 82.91 m 211.08 average 6.00m deep 1.85 115.16 106.46 82.91 m 304.53
hours £ £ £ rate £
Extra for Type N sand bed 900 × 150mm 0.14 8.72 7.50 2.54 m 18.76 Type T sand surround 900 wide × 150mm 0.28 17.43 15.00 10.39 m 42.82 Type F granular bed 900 × 150mm 0.15 9.34 8.04 3.68 m 21.06 Type S granular surround 900 × 150mm 0.28 17.43 15.00 15.03 m 47.46 Type A concrete bed 900 × 150mm 0.21 13.07 11.25 14.01 m 38.33 Type B, 150mm concrete bed and haunch 0.43 26.77 23.04 14.96 m 64.77 Type Z concrete surround 900 wide × 150mm 0.40 24.90 21.43 57.48 m 103.81
Concrete pipes with rebated flexible joints to BS 5911-1 450mm diameter piped culvert in trench, depth to invert
average 2.00m deep 0.33 20.54 19.07 23.20 m 62.81 average 3.00m deep 0.44 27.39 25.13 23.20 m 75.72 average 4.00m deep 0.72 44.82 41.11 23.20 m 109.13 average 6.00m deep 1.65 102.71 94.72 23.20 m 220.63
Extra for Type A concrete bed 1050 × 150mm 0.24 14.94 12.86 16.34 m 44.14 Type Z concrete surround 1050 wide × 150mm 0.45 28.01 24.11 73.24 m 125.36
750mm diameter piped culvert in trench, depth to invert
average 2.00m deep 0.38 25.52 27.85 68.73 m 122.10 average 3.00m deep 0.52 34.93 37.97 68.73 m 141.63 average 4.00m deep 0.92 61.79 67.21 68.73 m 197.73 average 6.00m deep 2.05 137.69 149.49 68.73 m 355.91
Extra for Type A concrete bed 1250 × 150mm 0.26 17.46 13.93 22.63 m 54.02 Type Z concrete surround 1250 wide × 150mm 0.50 33.58 26.79 164.58 m 224.95
900mm diameter piped culvert in trench, depth to invert
average 2.00m deep 0.43 28.88 31.48 92.31 m 152.67 average 3.00m deep 0.62 41.64 45.37 92.31 m 179.32 average 4.00m deep 1.06 71.20 77.43 92.31 m 240.94 average 6.00m deep 2.25 151.13 164.05 92.31 m 407.49
Extra for Type A concrete bed 1500 × 150mm 0.28 18.81 15.00 26.50 m 60.31 Type Z concrete surround 1500 wide × 150mm 0.55 36.94 29.47 228.85 m 295.26
Corrugated steel pipes galvanized, hot dip bitumen coated (Armco type) 1000mm diameter piped culvert in trench, Type S granular surround, depth to invert
average 2.00m deep 0.99 66.50 72.42 133.47 m 272.39 1600mm diameter piped culvert in trench, Type S granular surround, depth to invert
average 2.00m deep 2.13 143.07 155.84 219.78 m 518.69 2000mm diameter piped culvert in trench, Type S granular surround, depth to invert
average 3.00m deep 2.97 199.49 217.28 446.32 m 863.09 2200mm diameter piped culvert in trench, Type S granular surround, depth to invert
average 3.00m deep 3.29 220.98 240.64 503.98 m 965.60
hours £ £ £ rate £
DRAINS AND SERVICE DUCTS (EXCLUDING FILTER, NARROW FILTER AND FIN DRAINS) – cont
Clay cable ducts; Hepduct 100mm diameter service duct in trench, Type S granular surround, depth to invert
average 1.00m deep 0.14 8.72 7.90 13.83 m 30.45 Two 100mm diameter service ducts in trench, Type S granular surround, depth to invert
average 1.00m deep 0.24 14.94 13.58 27.44 m 55.96 Three 100mm diameter service ducts in trench, Type S granular surround, depth to invert
average 1.00m deep 0.32 19.92 18.09 39.79 m 77.80 Four 100mm diameter service ducts in trench, Type S granular surround, depth to invert
average 1.00m deep 0.40 24.90 22.65 54.57 m 102.12 Six 100mm diameter service ducts in trench, Type S granular surround, depth to invert
average 1.00m deep 0.60 37.35 33.90 76.21 m 147.46 Extra for
Type Z concrete surround on single duct 0.08 4.98 4.29 9.12 m 18.39 Type Z concrete surround on additional ways 0.08 4.98 4.29 9.12 m 18.39 150mm diameter conduit, per way 0.01 0.62 0.54 14.96 m 16.12 225mm diameter conduit, per way 0.01 0.62 0.54 41.43 m 42.59
FILTER DRAINS
Vitrified clay perforated pipes to BS 65, sleeved joints 150mm diameter filter drain in trench with Type A bed and Type A fill filter material
average 1.00m deep 0.26 16.19 14.10 22.11 m 52.40 average 2.00m deep 0.30 18.68 16.22 29.45 m 64.35 average 3.00m deep 0.35 21.79 19.04 36.80 m 77.63
150mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.26 16.19 14.10 30.86 m 61.15 average 2.00m deep 0.30 18.68 16.22 46.39 m 81.29 average 3.00m deep 0.35 21.79 19.04 61.84 m 102.67
225mm pipes with Type A bed and Type A fill, depth average 1.00m deep 0.27 16.81 14.58 38.79 m 70.18 average 2.00m deep 0.31 19.30 16.68 47.79 m 83.77 average 3.00m deep 0.36 22.41 19.56 56.12 m 98.09
225mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.27 16.81 14.58 47.91 m 79.30 average 2.00m deep 0.31 19.30 16.68 66.47 m 102.45 average 3.00m deep 0.36 22.41 19.56 84.22 m 126.19
300mm pipes with Type A bed and Type A fill, depth average 1.00m deep 0.28 17.43 15.10 52.43 m 84.96 average 2.00m deep 0.32 19.92 17.30 62.78 m 100.00 average 3.00m deep 0.37 23.03 20.04 72.63 m 115.70
hours £ £ £ rate £
300mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.28 17.43 15.10 60.34 m 92.87 average 2.00m deep 0.32 19.92 17.30 81.18 m 118.40 average 3.00m deep 0.37 23.03 20.04 101.81 m 144.88
Conc. porous pipe BS 5911-114, sleeved joints 150mm pipes with Type A bed and Type A fill, depth
average 1.00m deep 0.26 16.19 14.10 15.94 m 46.23 average 2.00m deep 0.30 18.68 16.22 23.28 m 58.18 average 3.00m deep 0.35 21.79 19.04 30.63 m 71.46
150mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.26 16.19 14.10 24.68 m 54.97 average 2.00m deep 0.30 18.68 16.22 40.21 m 75.11 average 3.00m deep 0.35 21.79 19.04 55.67 m 96.50
225mm pipes with Type A bed and Type A fill, depth average 1.00m deep 0.27 16.81 14.58 18.28 m 49.67 average 2.00m deep 0.31 19.30 16.68 27.27 m 63.25 average 3.00m deep 0.36 22.41 19.56 35.61 m 77.58
225mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.27 16.81 14.58 27.39 m 58.78 average 2.00m deep 0.31 19.30 16.68 45.95 m 81.93 average 3.00m deep 0.36 22.41 19.56 63.70 m 105.67
300mm pipes with Type A bed and Type A fill, depth average 1.00m deep 0.28 17.43 15.10 21.36 m 53.89 average 2.00m deep 0.32 19.92 17.30 31.70 m 68.92 average 3.00m deep 0.37 23.03 20.04 41.56 m 84.63
300mm pipes with Type A bed and Type B fill, depth average 1.00m deep 0.28 17.43 15.10 29.27 m 61.80 average 2.00m deep 0.32 19.92 17.30 50.10 m 87.32 average 3.00m deep 0.37 23.03 20.04 70.73 m 113.80
Filter material contiguous with filter drains, subbase material and lightweight aggregate infill Type A 0.07 4.36 3.47 16.57 m3 24.40 Type B 0.07 4.36 3.60 35.37 m3 43.33
Excavate and replace filter material contiguous with filter drain Type A 0.47 14.48 17.33 16.57 m3 48.38 Type B 0.47 14.48 17.33 35.37 m3 67.18
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 10.58 9.64 13.91 m 34.13 average 2.00m deep 0.23 14.32 13.01 20.02 m 47.35
hours £ £ £ rate £
FIN DRAINS AND NARROW FILTER DRAINS – cont
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 10.58 9.64 23.76 m 43.98 average 2.00m deep 0.23 14.32 13.01 29.87 m 57.20
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 10.58 9.64 21.92 m 42.14 average 2.00m deep 0.22 13.70 12.41 23.78 m 49.89
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 10.58 9.64 24.11 m 44.33 average 2.00m deep 0.23 14.32 13.01 27.86 m 55.19
CONNECTIONS
Note: excavation presumed covered by new trench Connection of pipe to existing drain, sewer or piped culvert
150mm 0.42 26.15 16.65 27.33 nr 70.13 225mm 0.60 37.35 28.20 101.86 nr 167.41 300mm 1.15 71.59 56.45 177.26 nr 305.30
Connection of pipes to existing chambers 150mm to one brick 1.20 74.70 67.92 8.30 nr 150.92 150mm to precast 0.60 37.35 33.95 8.30 nr 79.60 300mm to one and a half brick 2.40 149.40 135.78 13.53 nr 298.71
hours £ £ £ rate £
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 × 1.752.00 in running sand × 2.75minimum in broken rock × 2.753.50 below water table × 2.00minimum
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 40.34 concrete base 129.48 brickwork chamber 236.05 concrete cover slab 144.39 concrete benching, main and branch channels 22.49 step irons 15.93 access cover and frame 382.50 TOTAL 971.18
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Brick construction – cont 750 × 700 chamber 1000 depth to invert
excavation, support, backfilling and disposal 80.68 concrete base 129.48 brickwork chamber 472.11 concrete cover slab 144.39 concrete benching; main and branch channels 22.49 step irons 31.86 access cover and frame 382.50 TOTAL 1263.51
750 × 700 chamber 1500 depth to invert excavation, support, backfilling and disposal 121.01 concrete base 129.48 brickwork chamber 708.16 concrete cover slab 144.39 concrete benching; main and branch channels 22.49 step irons 47.79 access cover and frame 382.50 TOTAL 1555.82
900 × 700 chamber 500 depth to invert excavation, support, backfilling and disposal 44.24 concrete base 143.94 brickwork chamber 253.40 concrete cover slab 157.91 concrete benching; main and branch channels 26.99 step irons 15.93 access cover and frame 382.50 TOTAL 1024.90
900 × 700 chamber 1000 depth to invert excavation, support, backfilling and disposal 88.47 concrete base 143.94 brickwork chamber 506.80 concrete cover slab 157.91 concrete benching; main and branch channels 26.99 step irons 31.86 access cover and frame 382.50 TOTAL 1338.47
900 × 700 chamber 1500 depth to invert excavation, support, backfilling and disposal 132.71 concrete base 143.94 brickwork chamber 760.20 concrete cover slab 157.91 concrete benching; main and branch channels 26.99 step irons 47.79 access cover and frame 382.50 TOTAL 1652.04
hours £ £ £ rate £
1050 × 700 chamber 1500 depth to invert excavation, support, backfilling and disposal 144.41 concrete base 158.41 brickwork chamber 812.25 concrete cover slab 171.42 concrete benching; main and branch channels 31.49 step irons 47.79 access cover and frame 382.50 TOTAL 1748.26
1050 × 700 chamber 2500 depth to invert excavation, support, backfilling and disposal 240.68 concrete base 158.41 brickwork chamber 1353.73 concrete cover slab 171.42 concrete benching; main and branch channels 31.49 step irons 79.65 access cover and frame 382.50 TOTAL 2417.88
1050 × 700 chamber 3500 depth to invert excavation, support, backfilling and disposal 336.95 concrete base 158.41 brickwork chamber 1895.23 concrete reducing slab 171.42 brickwork access shaft 1935.70 concrete cover slab 139.89 concrete benching; main and branch channels 31.49 step irons 111.51 access cover and frame 382.50 TOTAL 5163.10
1350 × 700 chamber 2500 depth to invert excavation, support, backfilling and disposal 279.66 concrete base 187.32 brickwork chamber 1527.21 concrete cover slab 198.45 concrete benching; main and branch channels 40.48 step irons 79.65 access cover and frame 382.50 TOTAL 2695.28
1350 × 700 chamber 3500 depth to invert excavation, support, backfilling and disposal 391.53 concrete base 187.32 brickwork chamber 2138.09 concrete reducing slab 198.45 brickwork access shaft 1935.70 concrete cover slab 139.89 concrete benching; main and branch channels 40.48 step irons 111.51 access cover and frame 382.50 TOTAL 5525.49
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Brick construction – cont 1350 × 700 chamber 4500 depth to invert
excavation, support, backfilling and disposal 503.40 concrete base 187.32 brickwork chamber 2748.98 concrete reducing slab 198.45 brickwork access shaft 2488.77 concrete cover slab 139.89 concrete benching; main and branch channels 40.48 step irons 143.37 access cover and frame 382.50 TOTAL 6833.17
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 diameter 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
675 diameter × 500 depth to invert excavation, support, backfilling and disposal 28.34 concrete base 44.06 main chamber rings 21.57 cover slab 72.42 concrete surround 45.29 concrete benching, main and branch channels 57.53 step irons 15.93 access cover and frame 382.50 TOTAL 667.64
hours £ £ £ rate £
675 diameter × 750 depth to invert excavation, support, backfilling and disposal 37.78 concrete base 44.06 main chamber rings 49.14 cover slab 72.42 concrete surround 66.10 concrete benching, main and branch channels 57.53 step irons 23.89 access cover and frame 382.50 TOTAL 733.43
675 diameter × 1000 depth to invert excavation, support, backfilling and disposal 45.75 concrete base 44.06 main chamber rings 77.91 cover slab 72.42 concrete surround 88.13 concrete benching, main and branch channels 57.53 step irons 31.86 access cover and frame 382.50 TOTAL 800.15
675 diameter × 1250 depth to invert excavation, support, backfilling and disposal 53.96 concrete base 44.06 main chamber rings 106.67 cover slab 72.42 concrete surround 108.94 concrete benching, main and branch channels 57.53 step irons 39.83 access cover and frame 382.50 TOTAL 865.90
900 diameter × 750 depth to invert excavation, support, backfilling and disposal 104.58 concrete base 123.80 main chamber rings 58.32 cover slab 83.53 concrete surround 70.03 concrete benching, main and branch channels 22.72 step irons 23.89 access cover and frame 382.50 TOTAL 869.38
900 diameter × 1000 depth to invert excavation, support, backfilling and disposal 139.43 concrete base 123.80 main chamber rings 77.78 cover slab 83.53 concrete surround 93.38 concrete benching, main and branch channels 22.72 step irons 31.86 access cover and frame 382.50 TOTAL 954.99
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Precast concrete construction – cont 900 diameter × 1500 depth to invert
excavation, support, backfilling and disposal 209.15 concrete base 123.80 main chamber rings 116.66 cover slab 83.53 concrete surround 140.07 concrete benching, main and branch channels 22.72 step irons 47.79 access cover and frame 382.50 TOTAL 1126.21
1200 diameter × 1500 depth to invert excavation, support, backfilling and disposal 259.02 concrete base 174.76 main chamber rings 122.78 cover slab 109.00 concrete surround 180.74 concrete benching, main and branch channels 40.38 step irons 47.79 access cover and frame 382.50 TOTAL 1316.97
1200 diameter × 2000 depth to invert excavation, support, backfilling and disposal 345.35 concrete base 174.76 main chamber rings 163.70 cover slab 109.00 concrete surround 241.00 concrete benching, main and branch channels 40.38 step irons 63.72 access cover and frame 382.50 TOTAL 1520.41
1200 diameter × 2500 depth to invert excavation, support, backfilling and disposal 431.69 concrete base 174.76 main chamber rings 204.63 cover slab 109.00 concrete surround 301.25 concrete benching, main and branch channels 40.38 step irons 79.65 access cover and frame 382.50 TOTAL 1723.86
hours £ £ £ rate £
1200 diameter × 3000 depth to invert excavation, support, backfilling and disposal 518.03 concrete base 174.76 main chamber rings 245.55 cover slab 109.00 concrete surround 361.50 concrete benching, main and branch channels 40.38 step irons 95.58 access cover and frame 382.50 TOTAL 1927.30
1800 diameter × 1500 depth to invert excavation, support, backfilling and disposal 376.27 concrete base 301.84 main chamber rings 369.50 cover slab 330.18 concrete surround 262.11 concrete benching, main and branch channels 90.86 step irons 47.79 access cover and frame 382.50 TOTAL 2161.04
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Precast concrete construction – cont 1800 diameter × 2000 depth to invert
excavation, support, backfilling and disposal 501.69 concrete base 301.84 main chamber rings 492.66 cover slab 330.18 concrete surround 349.47 concrete benching, main and branch channels 90.86 step irons 63.72 access cover and frame 382.50 TOTAL 2512.92
1800 diameter × 2500 depth to invert excavation, support, backfilling and disposal 627.11 concrete base 301.84 main chamber rings 615.83 cover slab 330.18 concrete surround 436.85 concrete benching, main and branch channels 90.86 step irons 79.65 access cover and frame 382.50 TOTAL 2864.81
1800 diameter × 3000 depth to invert excavation, support, backfilling and disposal 752.53 concrete base 301.84 main chamber rings 738.48 cover slab 330.18 concrete surround 524.21 concrete benching, main and branch channels 90.86 step irons 95.58 access cover and frame 382.50 TOTAL 3216.17
1800 diameter × 3500 depth to invert excavation, support, backfilling and disposal 877.95 concrete base 301.84 main chamber rings 862.15 reducing slab 348.08 access shaft 272.20 cover slab 83.53 concrete surround 611.58 concrete benching, main and branch channels 90.86 step irons 111.51 access cover and frame 382.50 TOTAL 3942.21
hours £ £ £ rate £
1800 diameter × 4000 depth to invert excavation, support, backfilling and disposal 1003.37 concrete base 301.84 main chamber rings 985.32 reducing slab 348.08 access shaft 311.08 cover slab 83.53 concrete surround 698.94 concrete benching, main and branch channels 90.86 step irons 127.44 access cover and frame 382.50 TOTAL 4332.97
2400 diameter × 1500 depth to invert excavation, support, backfilling and disposal 516.87 concrete base 462.50 main chamber rings 939.57 cover slab 955.53 concrete surround 343.46 concrete benching, main and branch channels 161.53 step irons 47.79 access cover and frame 382.50 TOTAL 3809.76
2400 diameter × 3000 depth to invert excavation, support, backfilling and disposal 1033.75 concrete base 462.50 main chamber rings 1879.15 cover slab 955.53 concrete surround 686.93 concrete benching, main and branch channels 161.53 step irons 95.58 access cover and frame 382.50 TOTAL 5657.46
2400 diameter × 4500 depth to invert excavation, support, backfilling and disposal 1550.63 concrete base 462.50 main chamber rings 2818.72 reducing slab 978.08 access shaft 349.96 cover slab 83.53 concrete surround 1030.38 concrete benching, main and branch channels 161.53 step irons 143.37 access cover and frame 382.50 TOTAL 7961.21
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont
Precast concrete construction – cont 2700 diameter × 1500 depth to invert
excavation, support, backfilling and disposal 595.95 concrete base 555.42 main chamber rings 1087.37 cover slab 1466.29 concrete surround 384.14 concrete benching, main and branch channels 204.43 step irons 47.79 access cover and frame 382.50 TOTAL 4723.89
2700 diameter × 3000 depth to invert excavation, support, backfilling and disposal 1191.89 concrete base 555.42 main chamber rings 2174.74 cover slab 1466.29 concrete surround 768.28 concrete benching, main and branch channels 204.43 step irons 95.58 access cover and frame 382.50 TOTAL 6839.14
2700 diameter × 4500 depth to invert excavation, support, backfilling and disposal 1787.75 concrete base 555.42 main chamber rings 3262.11 reducing slab 1595.18 access shaft 349.96 cover slab 83.53 concrete surround 1152.42 concrete benching, main and branch channels 204.43 step irons 143.37 access cover and frame 382.50 TOTAL 9516.67
3000 diameter × 3000 depth to invert excavation, support, backfilling and disposal 1361.70 concrete base 656.73 main chamber rings 3061.53 cover slab 1869.32 concrete surround 849.64 concrete benching, main and branch channels 252.38 step irons 95.58 access cover and frame 382.50 TOTAL 8529.38
hours £ £ £ rate £
3000 diameter × 4500 depth to invert excavation, support, backfilling and disposal 2042.56 concrete base 656.73 main chamber rings 4592.30 reducing slab 2035.65 access shaft 349.96 cover slab 83.53 concrete surround 1274.46 concrete benching, main and branch channels 252.38 step irons 143.37 access cover and frame 382.50 TOTAL 11813.43
3000 diameter × 6000 depth to invert excavation, support, backfilling and disposal 2723.41 concrete base 656.73 main chamber rings 6123.06 reducing slab 2035.65 access shaft 466.62 cover slab 83.53 concrete surround 1699.28 concrete benching, main and branch channels 252.38 step irons 191.16 access cover and frame 382.50 TOTAL 14614.31
Clayware vertical pipe complete with rest bend at base and tumbling bay junction to main drain complete with stopper; concrete grade C20 surround, 150mm thick; additional excavation and disposal 100 pipe
1.15m to invert nr 103.89 2.15m to invert nr 132.67 3.15m to invert nr 160.20 4.15m to invert nr 190.24
150 pipe 1.15m to invert nr 160.20 2.15m to invert nr 192.75 3.15m to invert nr 230.30 4.15m to invert nr 267.84
225 pipe 1.15m to invert nr 319.16 2.15m to invert nr 374.23 3.15m to invert nr 431.80 4.15m to invert nr 491.87
Vitrified clay; set in concrete grade C20, 150mm thick; additional excavation and disposal
hours £ £ £ rate £
CHAMBERS AND GULLIES – cont Road gulley
450mm diameter × 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 22.92 1.21 396.94 nr 421.07
Yard gulley (mud); trapped with rodding eye; galvanized bucket; stopper
225mm diameter, 100mm diameter outlet, cast iron hinged grate and frame 0.30 13.75 0.76 297.19 nr 311.70
Grease interceptors; internal access and bucket 600 × 450mm, metal tray and lid, square hopper with horizontal inlet 0.35 16.05 0.84 1109.49 nr 1126.38
Precast concrete; set in concrete grade C20P, 150mm thick; additional excavation and disposal Road gulley; trapped with rodding eye; galvanized bucket; stopper
450mm diameter × 900mm deep, cast iron road gulley grating and frame group 4, 434 × 434mm, on Class B engineering brick seating 0.54 24.76 1.31 247.01 nr 273.08
SOFT SPOTS AND OTHER VOIDS Excavation of soft spots and other voids in bottom of trenches, chambers and gullies 0.07 4.36 3.99 – m3 8.35 Filling of soft spots and other voids in bottom of trenches, chambers and gullies with imported selected sand 0.09 5.60 4.72 19.91 m3 30.23 Filling of soft spots and other voids in bottom of trenches, chambers and gullies with imported natural gravel 0.09 5.60 4.72 29.60 m3 39.92 Filling of soft spots and other voids in bottom of trenches, chambers and gullies with concrete Grade C15, 40mm aggregate 0.09 5.60 4.67 92.91 m3 103.18 Filling of soft spots and other voids in bottom of trenches, chambers and gullies with concrete Grade C20, 20mm aggregate 0.09 5.60 4.67 82.29 m3 92.56
SUPPORTS LEFT IN EXCAVATION
Timber close boarded supports left in trench – – 8.67 – m2 8.67 pits – – 8.67 – m2 8.67
Steel trench sheeting supports left in trench – – 36.38 – m2 36.38 pits – – 36.38 – m2 36.38
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 2.75 0.49 13.68 nr 16.92 Lowering the level of 100 × 100mm water stop tap boxes on 100 × 100mm brick chambers
by 150mm or less 0.04 1.83 0.31 27.99 nr 30.13 Raising the level of 420 × 420mm cover and frame on 420 × 420mm in situ concrete chamber
by 150mm or less 0.10 4.58 0.80 35.35 nr 40.73 Lowering the level of 420 × 420mm British Telecom cover and frame on 420 × 420mm in situ concrete chamber
by 150mm or less 0.08 3.44 2.18 16.96 nr 22.58 Raising the level of 700 × 500mm cover and frame on 700 × 500mm in situ concrete chamber
by 150mm or less 0.17 7.79 1.34 13.68 nr 22.81 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 7.79 1.34 27.99 nr 37.12 by 150-300mm 0.21 9.63 1.66 35.35 nr 46.64
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 4.58 0.80 16.96 nr 22.34
REMOVE FROM STORE AND REINSTALL COVERS
Remove from store and reinstall cover and frame 600 × 600mm; Group 5; super heavy duty E600 cast iron 0.25 11.46 0.69 385.05 nr 397.20 600 × 600mm; Group 4; heavy duty triangular D400 cast iron 0.25 11.46 0.69 235.62 nr 247.77 600 × 600 × 75mm; Group 2; light duty single seal B125 cast iron 0.25 11.46 0.69 125.84 nr 137.99 600 × 600 × 100mm; Group 2; medium duty single seal B125 cast iron 0.25 11.46 0.69 137.55 nr 149.70
hours £ £ £ rate £
GROUTING UP OF EXISTING DRAINS AND SERVICE DUCTS
Concrete Grade C15 Sealing redundant road gullies 0.02 0.92 0.14 12.70 m3 13.76 Filling redundant chambers with
ne 1.0m deep to invert 0.09 5.60 4.45 50.95 nr 61.00 1.0-2.0m deep to invert 0.21 13.07 10.38 82.34 nr 105.79 2.0-3.0m deep to invert 0.55 34.24 27.17 137.21 nr 198.62
Grouting up of existing drains and service ducts 100mm diameter 0.03 1.87 1.50 3.00 m 6.37 300mm diameter 0.13 8.09 6.53 12.71 m 27.33 450mm diameter 0.26 16.19 13.05 26.40 m 55.64 600mm diameter 0.50 31.13 25.09 53.61 m 109.83 1200mm diameter 1.70 105.83 85.29 149.87 m 340.99
EXCAVATION IN HARD MATERIAL
Extra over excavation for excavation in Hard Material in drainage:
existing pavement, brickwork, concrete, masonry and the like 0.15 9.34 9.03 – m3 18.37 rock 0.35 21.79 21.07 – m3 42.86 reinforced concrete 0.60 37.35 37.06 – m3 74.41
Reinstatement of pavement construction; extra over excavation for breaking up and subsequently reinstating 150mm flexible surfacing and 280mm subbase
100mm diameter sewer, drain or service duct 0.09 5.60 5.28 14.16 m 25.04 150mm diameter sewer, drain or service duct 0.10 6.23 5.88 15.10 m 27.21 225mm diameter sewer, drain or service duct 0.10 6.23 5.88 16.52 m 28.63 300mm diameter sewer, drain or service duct 0.10 6.23 5.88 16.99 m 29.10 375mm diameter sewer, drain or service duct 0.10 6.23 5.88 17.46 m 29.57 450mm diameter sewer, drain or service duct 0.12 7.47 6.44 18.40 m 32.31 2 way 100mm diameter service ducts 0.10 6.23 5.88 14.63 m 26.74 3 way 100mm diameter service ducts 0.10 6.23 5.88 15.10 m 27.21 4 way 100mm diameter service ducts 0.10 6.23 5.88 16.52 m 28.63
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.
