ABSTRACT
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 £
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 pulverised fuel ash – – – – t 15.95 sand – – – – t 15.38 pea gravel – – – – t 15.38 bentonite (2:1) – – – – t 141.90
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/PFA grout – – – – t 57.08
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 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
The following costs are based on constructing a diaphragm wall with an excavated volume of 4000m3 using standard equipment Typical progress would be up to 500m per week. Establishment of standard plant and equipment including bentonite storage tanks and removal on completion – – – – sum 120000.00 Standing time – – – – hr 925.00 Excavation, disposal of soil and placing of concrete – – – – m3 440.00 Provide and place reinforcement cages – – – – t 750.00 Excavate/chisel in hard material/rock – – – – hr 975.00 Waterproofed joints – – – – m 6.50 Guide walls
guide walls (twin) – – – – m 340.00
GROUND ANCHORAGES
Notes Ground anchorages consist of the installation of a cable or solid bar tendon fixed in the ground by grouting and tensioned to exceed the working load to be carried. Ground anchors may be of a permanent or temporary nature and can be used in conjunction with diaphragm walls or sheet piling to eliminate the use of strutting etc.
