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.