ABSTRACT
DRILLING FOR GROUT HOLES
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 7203.00
Standing time – – – – hour 132.81 Drilling through material
artificial hard material vertically downwards
depth ne 5 m – – – – m 15.14 depth 5-10 m – – – – m 17.56 depth 10-20 m
– – – – m 20.59
depth 20-30 m
– – – – m 25.43
downwards at an angle 0-45 degrees to the vertical
depth ne 5 m – – – – m 15.14 depth 5-10 m – – – – m 17.56 depth 10-20 m
– – – – m 20.59
depth 20-30 m
– – – – m 25.43
horizontally or downwards at an angle less than 45 degrees to the horizontal
depth ne 5 m – – – – m 15.14 depth 5-10 m – – – – m 17.56 depth 10-20 m
– – – – m 20.59
depth 20-30 m
– – – – m 25.43
upwards at an angle 0-45 degrees to the horizontal
depth ne 5 m – – – – m 25.43 depth 5-10 m – – – – m 29.07 depth 10-20 m
– – – – m 31.50
depth 20-30 m
– – – – m 34.53
upwards at an angle less than 45 degrees to the vertical
depth 10-20 m
– – – – m 31.50
depth 20-30 m
– – – – m 34.53
Drilling through rock or artificial hard material Vertically downwards
depth ne 5 m – – – – m 16.82 depth 5-10 m – – – – m 20.64 depth 10-20 m
– – – – m 25.25
depth 20-30 m
– – – – m 31.34
rate £ Downwards at an angle 0-45 degrees to the vertical
depth ne 5 m – – – – m 16.82 depth 5-10 m – – – – m 20.64 depth 10-20 m – – – – m 25.25 depth 20-30 m – – – – m 31.34 Horizontally or downwards at an angle less than 45 degrees to the horizontal
depth ne 5 m – – – – m 16.82 depth 5-10 m – – – – m 20.64 depth 10-20 m – – – – m 25.25 depth 20-30 m – – – – m 31.34 Upwards at an angle 0-45 degrees to the horizontal
depth ne 5 m – – – – m 30.59 depth 5-10 m – – – – m 34.40 depth 10-20 m – – – – m 38.99
angle less than 45 degrees to the horizontal
depth ne 5 m – – – – m 30.59 depth 5-10 m – – – – m 34.40 depth 10-20 m – – – – m 38.99 depth 20-30 m – – – – m 43.58 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 85.62
multiple water pressure tests
– – – – nr 6.13
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 99.97
sulphate resistant cement
– – – – t 101.07
cement grout – – – – t 123.76 pulverised fuel ash
– – – – t 14.50
sand – – – – t 13.99
Injection Establishment of standard injection plant and
removal on completion
– – – – sum 7106.96
Standing time – – – – hr 112.05 number of injections
– – – – nr 52.59
neat cement grout
– – – – t 91.40
cement/P.F.A. grout
– – – – t 53.10
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
walls up to 100 m deep. Restricted urban sites will significantly increase the costs. The following costs are based on constructing a diaphragm wall with an excavated volume of 4000 m2 using a grab. Typical progress would be up to 500 m per week. Disposal of excavated material is not included in the unit costs.
