ABSTRACT
Disposal of material arising from pile bores The disposal of excavated material is shown separately, partly as this task is generally carried out by the main contractor rather than the piling specialist, but also to allow for simple adjustment should contaminated ground be envisaged. Disposal of material arising from pile bores; collection from around piling operations storage on site; 100 m maximum distance; using 22.5 t ADT 0.05 0.90 3.37 - m3 4.27 removal; 5 km distance; using 20 t tipper 0.12 2.17 6.54 - m3 8.71 removal; 15 km distance; using 20 t tipper 0.22 3.97 11.99 - m3 15.97
Add to the above rates where tipping charges apply (excluding Landfill Tax): non-hazardous waste - - - - m3 29.62 hazardous waste - - - - m3 74.25 special waste - - - - m3 90.75 contaminated liquid - - - - m3 94.88 contaminated sludge - - - - m3 123.75
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
Add to the above rates where Landfill Tax applies: exempted material - - - - m3 - inactive or inert material - - - - m3 3.75 other material - - - - m3 48.00
Concrete 35 N/mm2, 20 mm aggregate; installed by tripod-mounted percussion rig The following unit costs cover the construction of small diameter bored piling using light and compact tripod rigs requiring no expensive site levelling or access ways. Piling can be constructed in very restricted headroom or on confined and difficult sites. Standard diameters are between 400 and 600 mm with a normal maximum depth of 20 m. The costs are based on installing 100 piles on a clear site with reasonable access. Diameter: 300 mm number of piles (see above) - - - - nr 121.58 concreted length - - - - m 8.96 depth bored to 10 m maximum depth - - - - m 49.56 depth bored to 15 m maximum depth - - - - m 54.58 depth bored to 20 m maximum depth - - - - m 59.59
Diameter: 450 mm number of piles ( see above) - - - - nr 146.95 concreted length - - - - m 34.29 depth bored to 10 m maximum depth - - - - m 92.17 depth bored to 15 m maximum depth - - - - m 102.44 depth bored to 20 m maximum depth - - - - m 112.84
Diameter: 600 mm number of piles (see above) - - - - nr 165.96 concreted length - - - - m 35.85 depth bored to 10 m maximum depth - - - - m 164.82 depth bored to 15 m maximum depth - - - - m 178.77 depth bored to 20 m maximum depth - - - - m 192.72
Concrete 35 N/mm2, 20 mm aggregate; installed by lorry/crawler-mounted rotary rig The following unit costs cover the construction of small diameter bored piles using lorry or crawler mounted rotary boring rigs. This type of plant is more mobile and faster in operation than the tripod rigs and is ideal for large contracts in cohesive ground. Construction of piles under bentonite suspension can be carried out to obviate the use of liners. Standard diameters of 450 - 900 mm diameter can be constructed to depths of 30 m. The costs are based on installing 100 piles on a clear site with reasonable access. Diameter: 300 mm number of piles (see above) - - - - nr 266.24 concreted length - - - - m 11.66 depth bored to 10 m maximum depth - - - - m 58.33 depth bored to 15 m maximum depth - - - - m 58.33 depth bored to 20 m maximum depth - - - - m 58.33
Diameter: 450 mm number of piles (see above) - - - - nr 266.24 concreted length - - - - m 23.33 depth bored to 10 m maximum depth - - - - m 72.91 depth bored to 15 m maximum depth - - - - m 72.91 depth bored to 20 m maximum depth - - - - m 72.91
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
BORED CAST IN PLACE CONCRETE PILES - cont'd
Concrete 35 N/mm2, 20 mm aggregate; installed by lorry/crawler-mounted rotary rig - cont'd Diameter: 600 mm number of piles (see above) - - - - nr 266.24 concreted length - - - - m 60.15 depth bored to 10 m maximum depth - - - - m 131.22 depth bored to 15 m maximum depth - - - - m 131.22 depth bored to 20 m maximum depth - - - - m 131.22
Concrete 35 N/mm2, 20 mm aggregate; installed by continuous flight auger The following unit costs cover the construction of piles by screwing a continuous flight auger into the ground to a design depth (Determined prior to commencement of piling operations and upon which the rates are based and subsequently varied to actual depths). Concrete is then pumped through the hollow stem of the auger to the bottom and the pile formed as the auger is withdrawn. Spoil is removed by the auger as it is withdrawn. This is a fast method of construction without causing disturbance or vibration to adjacent ground. No casing is required even in unsuitable soils. Reinforcement can be placed after grouting is complete. The costs are based on installing 100 piles on a clear site with reasonable access. Diameter: 300 mm number of piles - - - - nr 54.00 concreted length - - - - m 10.81 depth bored to 10 m maximum depth - - - - nr 22.82 depth bored to 15 m maximum depth - - - - nr 22.82 depth bored to 20 m maximum depth - - - - nr 22.82
Diameter: 450 mm number of piles - - - - nr 54.00 concreted length - - - - m 23.41 depth bored to 10 m maximum depth - - - - nr 29.03 depth bored to 15 m maximum depth - - - - nr 29.03 depth bored to 20 m maximum depth - - - - nr 29.03
Diameter: 600 mm number of piles - - - - nr 54.00 concreted length - - - - m 56.63 depth bored to 10 m maximum depth - - - - nr 32.38 depth bored to 15 m maximum depth - - - - nr 32.38 depth bored to 20 m maximum depth - - - - nr 32.38
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
DRIVEN CAST IN PLACE CONCRETE PILES
Generally The items "number of piles" are calculated based on the following: allowance for provision of all plant, equipment and labour including transporting to and from site and establishing and dismantling at £6,250 in total for piles using the Temporary Steel Casing Method and £10,500 in total for piles using the Segmental Casing Method. moving the rig to and setting up at each pile position; preparing to commence driving; £110.00 per pile.
