ABSTRACT
NOTE The processes referred to in this Section are generally carried out by Specialist Contractors and the costs are therefore an indication of the probable costs based on average site conditions.
The following unit costs are based on drilling 100grout holes on a clear site with reasonable access Establishment of standard drilling plant and equipment and removal on completion – – – – sum 8750.00 Standing time – – – – hour 175.00
Drilling through material other than rock or artificial hard material vertically downwards
depth ne 5m – – – – m 16.65 depth 5-10m – – – – m 19.32 depth 10-20m – – – – m 22.65 depth 20-30m – – – – m 27.97
downwards at an angle 0-45° to the vertical depth ne 5m – – – – m 16.65 depth 5-10m – – – – m 19.32 depth 10-20m – – – – m 22.65 depth 20-30m – – – – m 27.97
horizontally or downwards at an angle less than 45° to the horizontal
depth ne 5m – – – – m 16.65 depth 5-10m – – – – m 19.32 depth 10-20m – – – – m 22.65 depth 20-30m – – – – m 27.97
upwards at an angle 0-45° to the horizontal depth ne 5m – – – – m 27.97 depth 5-10m – – – – m 31.98 depth 10-20m – – – – m 34.65 depth 20-30m – – – – m 37.98
upwards at an angle less than 45° to the vertical depth ne 5m – – – – m 27.97 depth 5-10m – – – – m 31.98 depth 10-20m – – – – m 34.65 depth 20-30m – – – – m 37.98
Drilling through rock or artificial hard material Vertically downwards
depth ne 5m – – – – m 18.50 depth 5-10m – – – – m 22.70 depth 10-20m – – – – m 27.78 depth 20-30m – – – – m 34.47
hours £ £ £ rate £
DRILLING FOR GROUT HOLES – cont
Drilling through rock or artificial hard material – cont Downwards at an angle 0-45° to the vertical
depth ne 5m – – – – m 18.50 depth 5-10m – – – – m 22.70 depth 10-20m – – – – m 27.78 depth 20-30m – – – – m 34.47
Horizontally or downwards at an angle less than 45° to the horizontal
depth ne 5m – – – – m 18.50 depth 5-10m – – – – m 22.70 depth 10-20m – – – – m 27.78 depth 20-30m – – – – m 34.47
Upwards at an angle 0-45° to the horizontal depth ne 5m – – – – m 33.65 depth 5-10m – – – – m 37.84 depth 10-20m – – – – m 42.89 depth 20-30m – – – – m 47.93
Upwards at an angle less than 45° to the horizontal depth ne 5m – – – – m 33.65 depth 5-10m – – – – m 37.84 depth 10-20m – – – – m 42.89 depth 20-30m – – – – m 47.93
GROUT HOLES
The following unit costs are based on drilling 100grout holes on a clear site with reasonable access Grout holes
number of holes – – – – nr 92.04 multiple water pressure tests – – – – nr 6.59
GROUT MATERIALS AND INJECTION
The following unit costs are based on drilling 100grout holes on a clear site with reasonable access Materials
ordinary portland cement – – – – t 110.00 sulphate resistant cement – – – – t 112.00 cement grout – – – – t 136.14 pulverized fuel ash – – – – t 15.95 sand – – – – t 15.38 pea gravel – – – – t 15.38 bentonite (2:1) – – – – t 141.90
hours £ £ £ rate £
Injection Establishment of standard injection plant and removal on completion – – – – sum 8750.00 Standing time – – – – hr 120.45 number of injections – – – – nr 56.53 neat cement grout – – – – t 98.25 cement / P.F.A. grout – – – – t 57.08
DIAPHRAGM WALLS
Notes Diaphragm walls are the construction of vertical walls, cast in place in a trench excavation. They can be formed in reinforced concrete to provide structural elements for temporary or permanent retaining walls. Wall thicknesses of 500mm to 1.50m and up to 40m deep may be constructed. Special equipment such as the Hydrofraise can construct walls up to 100m deep. Restricted urban sites will significantly increase the costs.
