ABSTRACT
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.
Concrete block retaining walls; Stepoc Excavate trench 750mm deep and lay concrete foundation 750mm wide × 400mm deep; construct Forticrete precast hollow concrete block wall with 450mm below ground laid all in accordance with manufacturer's instructions; fix reinforcing bar 12mm as work proceeds; fill blocks with ready mixed concrete; Allow for two coats of bitumen based waterproofing to back of wall; backfilling against face of wall with drainage trench perforated pipe filled with gravel rejects 600mm deep
Walls 1.00m high type 200; 400×225 × 200mm m 205.00 type 256; 400×225 × 256mm m 230.00
As above but 1.50m high type 200; 400×225 × 200mm m 250.00 type 256; 400×225 × 256mm m 280.00
Walls 1.50m high as above but with foundation 1.80m wide × 450mm deep type 200; 400×225 × 200mm m 370.00 type 256; 400×225 × 256mm m 400.00
Walls 1.80m high type 200; 400×225 × 200mm m 395.00 type 256; 400×225 × 256mm m 435.00
Hollow concrete block retaining wall Excavate trench 750mm deep and lay concrete foundation 750mm wide × 400mm deep; construct hollow concrete block wall with 450mm below ground laid all in accordance with manufacturer's instructions; fix reinforcing bar 12mm as work proceeds; fill blocks with concrete 1:3:6 as work proceeds; allow for two coats of bitumen based waterproofing to back of wall; backfilling against face of wall with drainage trench perforated pipe filled with gravel rejects 600mm deep
Walls 1.00m high m 185.00 Walls 1.25m high m 200.00 Walls 1.50m high m 220.00
£ Excluding site overheads and profit
Excavate trench 750mm deep and lay concrete foundation 1.80m wide × 400mm deep; construct hollow concrete block wall with 225mm below ground; fix reinforcing bar 12mm as work proceeds; fill blocks with concrete 1:3:6 as work proceeds; Allow for two coats of bitumen based waterproofing to back of wall; backfilling against face of wall with drainage trench perforated pipe filled with gravel rejects 600mm deep
Walls 1.50m high m 345.00 Walls 1.80m high m 370.00
PRECAST CONCRETE RETAINING WALLS
Excavate trench and lay concrete foundation 600×300; 1:3:6: plain concrete, supply and install Milton Precast Concrete precast concrete L shaped units, constructed all in accordance with manufacturer's instructions; backfill with approved excavated material compacted as the work proceeds 1500mm high × 1000mm wide m 250.00 2500mm high × 1000mm wide m 490.00 3000mm high × 1000mm wide m 580.00
GABION WALLS
Gabion walls; excavation costs excluded; see Grading and preparation of banks above
Gabions 500mm high; allowance of 1.00m working space at top of bank; backfill working space and remove balance of arisings off site; lay concrete footing; 200mm deep × 1.50m wide Height retained
500mm m 110.00 1.00m m 170.00 1.50m m 235.00 2.00m m 295.00
TIMBER RETAINING WALLS
Timber log retaining walls
Excavate trench 300mm wide to one third of the finished height of the retaining walls below; lay 100mm hardcore; fix machine rounded logs set in concrete 1:3:6; remove excavated material from site; fix geofabric to rear of timber logs; backfill with previously excavated material set aside in position; all works by machine 100mm diameter logs
500mm high (constructed from 1.80m lengths) m 81.00 1.20m high (constructed from 1.80m lengths) m 125.00 1.60m high (constructed from 2.40m lengths) m 180.00 2.00m high (constructed from 3.00m lengths) m 230.00
£ Excluding site overheads and profit
TIMBER RETAINING WALLS – cont
Excavate trench 300mm wide to one third of the finished height of the retaining walls below – cont 150mm diameter logs
1.20m high (constructed from 1.80m lengths) m 220.00 1.60m high (constructed from 2.40m lengths) m 255.00
200mm diameter logs 2.00m high (constructed from 3.00m lengths) m 290.00
Timber crib wall Excavate trench to receive foundation 300mm deep; place plain concrete foundation 150mm thick in 11.50N/mm² concrete (sulphate-resisting cement); construct timber crib retaining wall and backfill with excavated spoil behind units
timber crib wall system; average 5.0m high m 1275.00 timber crib wall system; average 4.0m high m 950.00 timber crib wall system; average 2.0m high m 425.00 timber crib wall system; average 1.00m high m 215.00
Railway sleeper wall; Excavate and remove spoil off site; Pour concrete footing 500×250 deep; lay sleeper retaining wall Grade 1 hardwood sleeper 2 450m×250mm wide × 150mm high; Sleepers set to galvanized pins set in the concrete
150mm high m 42.50 300mm high m 69.00 450mm high m 95.00 600mm high m 120.00
Grade 1 hardwood; 2 galvanized angle iron stakes per sleeper length set into concrete
750mm high m 170.00 900mm high m 190.00
