ABSTRACT
The following unit costs are based on drilling 100 grout holes on a clear site with reasonable access Establishment of standard drilling plant and equipment and removal on completion - - - - sum 8750.00 Standing time - - - - hr 175.00
Drilling through material other than rock or artificial hard material vertically downwards depth ne 5 m - - - - m 18.32 depth 5 - 10 m - - - - m 21.25 depth 10 - 20 m - - - - m 24.91 depth 20 - 30 m - - - - m 30.77
downwards at an angle 0-45° to the vertical depth ne 5 m - - - - m 18.32 depth 5 - 10 m - - - - m 21.25 depth 10 - 20 m - - - - m 24.91 depth 20 - 30 m - - - - m 30.77
horizontally or downwards at an angle less than 45° to the horizontal depth ne 5 m - - - - m 18.32 depth 5 - 10 m - - - - m 21.25 depth 10 - 20 m - - - - m 24.91 depth 20 - 30 m - - - - m 30.77
upwards at an angle 0-45° to the horizontal depth ne 5 m - - - - m 30.77 depth 5 - 10 m - - - - m 35.18 depth 10 - 20 m - - - - m 38.12 depth 20 - 30 m - - - - m 41.78
upwards at an angle less than 45° to the vertical depth ne 5 m - - - - m 30.77 depth 5 - 10 m - - - - m 35.18 depth 10 - 20 m - - - - m 38.12 depth 20 - 30 m - - - - m 41.78
Drilling through rock or artificial hard material Vertically downwards depth ne 5 m - - - - m 20.81 depth 5 - 10 m - - - - m 25.54 depth 10 - 20 m - - - - m 31.25 depth 20 - 30 m - - - - m 38.78
Downwards at an angle 0-45° to the vertical depth ne 5 m - - - - m 20.81 depth 5 - 10 m - - - - m 25.54 depth 10 - 20 m - - - - m 31.25 depth 20 - 30 m - - - - m 38.78
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
Horizontally or downwards at an angle less than 45° to the horizontal depth ne 5 m - - - - m 20.81 depth 5 - 10 m - - - - m 25.54 depth 10 - 20 m - - - - m 31.25 depth 20 - 30 m - - - - m 38.78
Upwards at an angle 0-45° to the horizontal depth ne 5 m - - - - m 37.02 depth 5 - 10 m - - - - m 41.62 depth 10 - 20 m - - - - m 47.18 depth 20 - 30 m - - - - m 52.72
Upwards at an angle less than 45° to the horizontal depth ne 5 m - - - - m 37.02 depth 5 - 10 m - - - - m 41.62 depth 10 - 20 m - - - - m 47.18 depth 20 - 30 m - - - - m 52.72
GROUT HOLES
The following unit costs are based on drilling 100 grout holes on a clear site with reasonable access Grout holes number of holes - - - - nr 101.24 multiple water pressure tests - - - - nr 7.25
GROUT MATERIALS AND INJECTION
The following unit costs are based on drilling 100 grout holes on a clear site with reasonable access Materials ordinary portland cement - - - - t 123.75 sulphate resistant cement - - - - t 126.00 cement grout - - - - t 153.16 pulverised fuel ash - - - - t 17.94 sand - - - - t 17.30 pea gravel - - - - t 17.30 bentonite (2:1) - - - - t 159.64
Injection Establishment of standard injection plant and removal on completion - - - - sum 8750.00 Standing time - - - - hr 132.50 number of injections - - - - nr 62.18 neat cement grout - - - - t 108.08 cement / P.F.A. grout - - - - t 62.79
Item Gang Labour Plant Material Unit Total hours £ £ £ rate £
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 500 mm to 1.50 m and up to 40 m deep may be constructed. Special equipment such as the Hydrofraise can construct walls up to 100 m deep. Restricted urban sites will significantly increase the costs.
