ABSTRACT
Excavate sloped bank to vertical to receive retaining or stabilization treatment priced below; allow 1.00m working space at top of bank; backfill working space and remove balance of arisings off site; measured as length along the top of the bank Bank height 1.00m; excavation by 5 tonne excavator
10° m 69.00 30° m 21.50 45° m 12.30 60° m 7.15
Bank height 1.00m; excavation by 5 tonne excavator; arisings moved to stockpile on site
10° m 12.70 30° m 6.50 45° m 3.75 60° m 2.20
Bank height 2.00m; excavation by 5 tonne excavator 10° m 280.00 30° m 84.00 45° m 49.00 60° m 28.00
Bank height 2.00m; excavation by 5 tonne excavator but arisings moved to stockpile on site
10° m 85.00 30° m 25.50 45° m 15.00 60° m 8.60
Bank height 3.00m; excavation by 21 tonne excavator 20° m 250.00 30° m 160.00 45° m 87.00 60° m 47.50
As above but arisings moved to stockpile on site 20° m 40.50 30° m 25.50 45° m 10.30 60° m 5.60
Excluding site overheads and profit
EROSION CONTROL MATS
Bank stabilization; erosion control mats Excavate fixing trench for erosion control mat 300× 300mm; backfill after placing mat selected below m 6.10
To anchor trench above; place mat to slope to be retained; allow extra over to the slope for the area of matting required to the anchor trench By machine; final grade only of excavated bank by excavator; lay erosion control solution; sow with low maintenance grass at 35 g/m2; spread imported topsoil 25mm thick incorporating medium grade sedge peat at 3 kg/m2 and fertilizer at 30 g/m2; water lightly
unseeded Eromat Light m² 2.75 seeded Covamat Standard m² 3.40 lay Greenfix biodegradable pre-seeded erosion control mat; fix with 6 × 300mm steel pegs at 1.0m centres m2 3.90 Tensar open textured erosion mat m² 5.40
By hand; final grade only of excavated bank by hand; lay erosion control solution; sow with low maintenance grass at 35 g/m2; spread imported topsoil 25mm thick incorporating medium grade sedge peat at 3 kg/m2 and fertilizer at 30 g/m2; water lightly
unseeded Eromat Light m² 3.20 seeded Covamat Standard m² 3.80 lay Greenfix biodegradable pre-seeded erosion control mat; fix with 6 × 300mm steel pegs at 1.0m centres m2 4.30 Tensar open textured erosion mat m² 5.85
Cellular retaining systems; excavate vertical bank to slope; grade to even grade; lay imported topsoil 200mm thick Slope angle 20°
excavation by 21 tonne excavator m 310.00
SOIL REINFORCEMENT
Geogrid soil reinforcement (Note: measured per metre run at the top of the bank)
Backfill excavated bank; lay Tensar geogrid; cover with excavated material as work proceeds 2.00m high bank; geogrid at 1.00m vertical lifts
10° slope m 590.00 20° slope m 330.00 30° slope m 240.00
2.00m high bank; geogrid at 0.50m vertical lifts 45° slope m 60.00 60° slope m 48.00
3.00m high bank 10° slope m 590.00 20° slope m 330.00 30° slope m 240.00 45° slope m 510.00
Excluding site overheads and profit
RETAINING WALL SYSTEMS
Note: The following models do not allow for excavation to the existing bank in preparation of the retaining system. Please amalgamate with the ‘Grading and preparation’ section above.
