ABSTRACT
Brick construction - cont'd 1350 x 700 chamber 2500 depth to invert excavation, support, backfilling and disposal 342.73 concrete base 229.56 brickwork chamber 1721.85 concrete cover slab 243.20 concrete benching and channels 49.61 step irons 81.42 access cover and frame 330.00 TOTAL £ 2998.37
1350 x 700 chamber 3500 depth to invert excavation, support, backfilling and disposal 479.81 concrete base 229.56 brickwork chamber 2410.60 access shaft 2182.41 reducing slab 243.20 concrete cover slab 171.44 concrete benching and channels 49.61 step irons 113.99 access cover and frame 330.00 TOTAL £ 6210.62
1350 x 700 chamber 4500 depth to invert excavation, support, backfilling and disposal 616.91 concrete base 229.56 brickwork chamber 3099.34 access shaft 2805.97 reducing slab 243.20 concrete cover slab 171.44 concrete benching and channels 49.61 step irons 146.56 access cover and frame 330.00 TOTAL £ 7692.59
Precast concrete construction Design criteria used in models: * circular shafts * 150 mm plain concrete C15/20 surround * 225 mm plain concrete C20/20 base slab * precast reducing slab * precast top slab * maximum height of working chamber 2.0 m above benching
* 750 mm diameter access shaft * plain concrete C15/20 benching, 150 mm clay main channel longitudinally and two 100 branch channels
* step irons at 300 mm centres, doubled if depth to invert exceeds 3000 mm
* heavy duty manhole cover and frame * in manholes over 6 m deep, landings at maximum intervals 675 diameter x 500 depth to invert
excavation, support, backfilling and disposal 30.00 concrete base 45.00 main chamber rings 21.60 cover slab 85.20 concrete benching and channels 58.75 concrete surround 46.25 step irons 15.58 access cover and frame 330.00 TOTAL £ 632.38
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
675 diameter x 750 depth to invert excavation, support, backfilling and disposal 40.00 concrete base 45.00 main chamber rings 49.20 cover slab 85.20 concrete benching and channels 58.75 concrete surround 67.50 step irons - access cover and frame 330.00 TOTAL £ 699.01
675 diameter x 1000 depth to invert excavation, support, backfilling and disposal 48.75 concrete base 45.00 main chamber rings 78.00 cover slab 85.20 concrete benching and channels 58.75 step irons - concrete surround 90.00 access cover and frame 330.00 TOTAL £ 766.85
675 diameter x 1250 depth to invert excavation, support, backfilling and disposal 57.50 concrete base 45.00 main chamber rings 106.80 cover slab 85.20 concrete benching and channels 58.75 concrete surround 111.25 step irons 40.71 access cover and frame 330.00 TOTAL £ 835.21
900 diameter x 750 depth to invert excavation, support, backfilling and disposal 128.16 concrete base 151.71 main chamber rings 68.62 cover slab 101.02 concrete benching and channels 33.08 concrete surround 85.83 step irons - access cover and frame 330.00 TOTAL £ 842.58
900 diameter x 1000 depth to invert excavation, support, backfilling and disposal 170.88 concrete base 151.71 main chamber rings 91.50 cover slab 101.02 concrete benching and channels 33.08 concrete surround 114.44 step irons - access cover and frame 330.00 TOTAL £ 956.08
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
MANHOLES - cont'd
Precast concrete construction - cont'd 900 diameter x 1500 depth to invert excavation, support, backfilling and disposal 256.31 concrete base 151.71 main chamber rings 137.24 cover slab 101.02 concrete benching and channels 33.08 concrete surround 171.65 step irons 48.85 access cover and frame 330.00 TOTAL £ 1130.95
1200 diameter x 1500 depth to invert excavation, support, backfilling and disposal 317.43 concrete base 214.16 main chamber rings 144.44 concrete benching and channels 49.49 cover slab 129.42 concrete surround 221.50 step irons 48.85 access cover and frame 330.00 TOTAL £ 1455.29
1200 diameter x 2000 depth to invert excavation, support, backfilling and disposal 423.23 concrete base 214.16 main chamber rings 192.59 cover slab 129.42 concrete benching and channels 49.49 concrete surround 295.34 step irons 65.14 access cover and frame 330.00 TOTAL £ 1699.36
1200 diameter x 2500 depth to invert excavation, support, backfilling and disposal 529.04 concrete base 214.16 main chamber rings 240.74 cover slab 129.42 concrete benching and channels 49.49 concrete surround 369.18 step irons 81.42 access cover and frame 330.00 TOTAL £ 1943.45
1200 diameter x 3000 depth to invert excavation, support, backfilling and disposal 634.84 concrete base 214.16 main chamber rings 288.89 cover slab 129.42 concrete benching and channels 49.49 concrete surround 443.01 step irons 97.70 access cover and frame 330.00 TOTAL £ 2187.51
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
1800 diameter x 1500 depth to invert excavation, support, backfilling and disposal 461.11 concrete base 369.90 main chamber rings 434.70 cover slab 347.76 concrete benching and channels 111.35 concrete surround 321.21
step irons 48.85 access cover and frame 330.00 TOTAL £ 2424.89
1800 diameter x 2000 depth to invert excavation, support, backfilling and disposal 614.81 concrete base 369.90 main chamber rings 579.60 cover slab 347.76 concrete benching and channels 111.35 concrete surround 428.27 step irons 65.14 access cover and frame 330.00 TOTAL £ 2846.83
1800 diameter x 2500 depth to invert excavation, support, backfilling and disposal 768.51 concrete base 369.90 main chamber rings 724.50 cover slab 347.76 concrete benching and channels 111.35 concrete surround 535.35 step irons 81.42 access cover and frame 330.00 TOTAL £ 3268.79
1800 diameter x 3000 depth to invert excavation, suport, backfilling and disposal 922.21 concrete base 369.90 main chamber rings 869.40 cover slab 347.76 concrete surround 642.41 concrete benching and channels 111.35 step irons 97.70 access cover and frame 330.00 TOTAL £ 3690.74
1800 diameter x 3500 depth to invert excavation, support, backfilling and disposal 1075.92 concrete base 369.90 access shaft 320.23 main chamber rings 1014.30 reducing slab 389.16 cover slab 101.02 concrete benching and channels 111.35 concrete surround 749.49 step irons 113.99 access cover and frame 330.00 TOTAL £ 4720.26
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
MANHOLES - cont'd
Precast concrete construction - cont'd 1800 diameter x 4000 depth to invert excavation, support, backfilling and disposal 1229.63 concrete base 369.90 access shaft 365.98 main chamber rings 1159.20 reducing slab 389.16 cover slab 101.02 concrete benching and channels 111.35 concrete surround 856.55 step irons 130.27 access cover and frame 330.00 TOTAL £ 5043.05
2400 diameter x 1500 depth to invert excavation, support, backfilling and disposal 633.42 concrete base 566.79 main chamber rings 1105.38 cover slab 1010.16 concrete benching and channels 197.95 concrete surround 420.91 step irons 48.85 access cover and frame 330.00 TOTAL £ 4313.47
2400 diameter x 3000 depth to invert excavation, support, backfilling and disposal 1266.85 concrete base 566.79 main chamber rings 2210.76 cover slab 1010.16 concrete benching and channels 197.95 concrete surround 841.83 step irons 97.70 access cover and frame 330.00 TOTAL £ 6522.04
2400 diameter x 4500 depth to invert excavation, support, backfilling and disposal 1900.29 concrete base 566.79 access shaft 411.72 main chamber rings 3316.14 reducing slab 1092.96 cover slab 101.02 concrete benching and channels 197.95 concrete surround 1262.72 step irons 146.56 access cover and frame 330.00 TOTAL £ 9326.14
2700 diameter x 1500 depth to invert excavation, support, backfilling and disposal 730.33 concrete base 680.66 main chamber rings 1279.26 cover slab 1540.08 concrete benching and channels 250.53 concrete surround 470.76 step irons 48.85 access cover and frame 330.00 TOTAL £ 5330.47
2700 diameter x 3000 depth to invert excavation, support, backfilling and disposal 1460.65 concrete base 680.66 main chamber rings 2558.52
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
cover slab 1540.08 concrete benching and channels 250.53 concrete surround 941.52 step irons 97.70 access cover and frame 330.00 TOTAL £ 7859.67
2700 diameter x 4500 depth to invert excavation, support, backfilling and disposal 2190.97 concrete base 680.66 access shaft 411.72 main chamber rings 3837.78 reducing slab 1788.48 cover slab 101.02 concrete benching and channels 250.53 concrete surround 1412.28 step irons 146.56 access cover and frame 330.00 TOTAL £ 11149.99
3000 diameter x 3000 depth to invert excavation, support, backfilling and disposal 1668.75 concrete base 804.81 main chamber rings 3601.80 cover slab 1987.20 concrete benching and channels 309.29 concrete surround 1041.22 step irons 97.70 access cover and frame 330.00 TOTAL £ 9840.78
3000 diameter x 4500 depth to invert excavation, support, backfilling and disposal 2503.14 concrete base 804.81 access shaft 411.72 main chamber rings 5402.70 reducing slab 2277.00 cover slab 101.02 concrete benching and channels 309.29 concrete surround 1561.84 step irons 146.56 access cover and frame 330.00 TOTAL £ 13848.07
3000 diameter x 6000 depth to invert excavation, support, backfilling and disposal 3337.51 concrete base 804.81 access shaft 548.96 main chamber rings 7203.60 reducing slab 2277.00 cover slab 101.02 concrete benching and channels 309.29 concrete surround 2082.45 step irons 195.41 access cover and frame 330.00 TOTAL £ 17190.05
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
BACKDROPS TO MANHOLES
Clayware vertical pipe complete with rest bend at base and tumbling bay junction to main drain complete with stopper; concrete grade C20 surround, 150 mm thick; additional excavation and disposal 100 pipe 1.15 m to invert - - - - nr 117.13 2.15 m to invert - - - - nr 149.58 3.15 m to invert - - - - nr 180.62 4.15 m to invert - - - - nr 214.49
150 pipe 1.15 m to invert - - - - nr 180.62 2.15 m to invert - - - - nr 217.32 3.15 m to invert - - - - nr 259.65 4.15 m to invert - - - - nr 301.98
225 pipe 1.15 m to invert - - - - nr 359.83 2.15 m to invert - - - - nr 421.92 3.15 m to invert - - - - nr 486.83 4.15 m to invert - - - - nr 554.56
GULLIES
Vitrified clay; set in concrete grade C20, 150 mm thick; additional excavation and disposal Road gulley 450 mm diameter x 900 mm deep, 100 mm or 150 mm outlet; PC £126.00.00*; cast iron road gulley grating and frame group 4 434 x 434 mm, PC £49.00*, on Class B engineering brick seating 0.50 30.80 1.63 315.20 nr 347.64
Yard gulley (mud); trapped with rodding eye; galvanised bucket; stopper 225 mm diameter, 100 mm diameter outlet, PC £89.00*; cast iron hinged grate and frame 0.30 18.48 0.98 193.64 nr 213.10
Grease interceptors; internal access and bucket 600 x 450 mm, PC £704.00*; metal tray and lid, square hopper with horizontal inlet 0.35 21.56 1.14 1019.56 nr 1042.26
Precast concrete; set in concrete grade C20, 150 mm thick; additional excavation and disposal Road gulley; trapped with rodding eye; galvanised bucket; stopper 450 mm diameter x 750 mm deep, PC £45.00*; cast iron road gulley grating and frame group 4, 434 x 434 mm, PC £55.00*, on Class B engineering brick seating 0.50 30.80 1.63 204.52 nr 236.95 450 mm diameter x 900 mm deep, PC £46.00*; cast iron road gulley grating and frame group 4, 434 x 434 mm, PC £55.00*, on Class B engineering brick seating 0.54 33.27 1.76 205.70 nr 240.73 450 mm diameter x 1050 mm deep, PC £50.00*; cast iron road gulley grating and frame group 4, 434 x 434 mm, PC £55.00*, on Class B engineering brick seating 0.58 35.73 1.89 208.21 nr 245.83
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
FRENCH DRAINS, RUBBLE DRAINS, DITCHES
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 easily worked soil with no abnormal conditions that would affect outputs and consistency of work. Multiplier Table for labour and plant for various site conditions for working: out of sequence x 2.75 (minimum) in hard clay x 1.75 to 2.00 in running sand x 2.75 (minimum) in broken rock x 2.75 to 3.50 below water table x 2.00 (minimum) Excavation of trenches for unpiped rubble drains (excluding trench support); cross-sectional area 0.25 - 0.50 m2 0.10 6.97 3.88 - m 10.85 0.50 - 0.75 m2 0.12 8.37 4.65 - m 13.01 0.75 - 1.00 m2 0.14 9.76 5.43 - m 15.19 1.00 - 1.50 m2 0.17 11.85 6.58 - m 18.44 1.50 - 2.00 m2 0.20 13.95 7.74 - m 21.69
Filling French and rubble drains with graded material graded material; 20 mm stone aggregate; PC £4.45/ t 0.30 20.92 11.62 26.79 m3 59.33 broken brick/concrete rubble; PC £3.42/t 0.29 20.22 11.23 19.32 m3 50.77
Excavation of rectangular section ditches; unlined; cross-sectional area 0.25 - 0.50 m2 0.11 7.67 4.16 - m 11.83 0.50 - 0.75 m2 0.13 9.06 4.92 - m 13.99 0.75 - 1.00 m2 0.16 11.16 6.06 - m 17.21 1.00 - 1.50 m2 0.20 13.95 7.57 - m 21.52 1.50 - 2.00 m2 0.25 17.43 9.46 - m 26.90
Excavation of rectangular ditches; lined with precast concrete slabs; cross-sectional area 0.25 - 0.50 m2 0.15 10.46 6.28 11.81 m 28.55 0.50 - 0.75 m2 0.25 17.43 10.50 19.47 m 47.39 0.75 - 1.00 m2 0.36 25.10 15.10 27.86 m 68.06 1.00 - 1.50 m2 0.40 27.89 16.78 39.50 m 84.16 1.50 - 2.00 m2 0.45 31.38 18.89 55.58 m 105.84
Excavation of vee section ditches; unlined; cross-sectional area 0.25 - 0.50 m2 0.10 6.97 4.44 - m 11.41 0.50 - 0.75 m2 0.12 8.37 5.29 - m 13.66 0.75 - 1.00 m2 0.14 9.76 6.20 - m 15.97 1.00 - 1.50 m2 0.18 12.55 7.97 - m 20.52 1.50 - 2.00 m2 0.22 15.34 9.73 - m 25.07
DUCTS AND METAL CULVERTS
Galvanised steel culverts; bitumen coated Sectional corrugated metal culverts, nominal internal diameter 0.5 - 1 m; 1000 mm nominal internal diameter, 1.6 mm thick not in trenches 0.15 9.24 1.03 97.71 m 107.98 in trenches, depth not exceeding 1.5 m 0.31 19.10 13.72 97.71 m 130.53 in trenches, depth 1.5 - 2 m 0.43 26.49 19.04 97.71 m 143.24 in trenches, depth 2 - 2.5 m 0.51 31.42 22.59 97.71 m 151.71 in trenches, depth 2.5 - 3 m 0.60 36.96 26.59 97.71 m 161.26
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
DUCTS AND METAL CULVERTS - cont'd
Galvanised steel culverts; bitumen coated - cont'd Sectional corrugated metal culverts, nominal internal diameter exceeding 1.5 m; 1600 mm nominal internal diameter, 1.6 mm thick not in trenches 0.21 12.94 1.47 182.93 m 197.33 in trenches, depth 1.5 - 2 m 0.44 27.11 19.50 182.93 m 229.54 in trenches, depth 2 - 2.5 m 0.56 34.50 24.82 182.93 m 242.25 in trenches, depth 2.5 - 3 m 0.68 41.89 30.14 182.93 m 254.96 in trenches, depth 3 -3.5 m 0.82 50.52 36.37 182.93 m 269.82
Sectional corrugated metal culverts, nominal internal diameter exceeding 1.5 m; 2000 mm nominal internal diameter, 1.6 mm thick not in trenches 0.26 16.02 1.82 391.19 m 409.03 in trenches, depth 2 - 2.5 m 0.46 28.34 20.42 391.19 m 439.94 in trenches, depth 2.5 - 3 m 0.60 36.96 26.59 391.19 m 454.74 in trenches, depth 3 - 3.5 m 0.75 46.21 33.22 391.19 m 470.62 in trenches, depth 3.5 - 4 m 0.93 57.29 41.23 391.19 m 489.71
Sectional corrugated metal culverts, nominal internal diameter exceeding 1.5 m; 2200 mm nominal internal diameter, 1.6 mm thick not in trenches 0.33 20.33 2.30 440.98 m 463.61 in trenches, depth 2.5 - 3 m 0.64 39.43 28.36 440.98 m 508.78 in trenches, depth 3 - 3.5 m 0.77 47.44 34.14 440.98 m 522.56 in trenches, depth 3.5 - 4 m 1.02 62.84 45.24 440.98 m 549.06 in trenches, depth exceeding 4 m 1.32 81.32 58.50 440.98 m 580.81
OTHER PIPEWORK ANCILLARIES
Notes Refer to Section G (Concrete and concrete ancillaries) for costs relevant to the construction of Headwall Structure.
