Large Diameter Bored Piles Skanska（大直径钻孔灌注桩,在建）.pdf

Further information: Cementation Skanska skanska.co.uk/cementation Large Diameter Bored Piles cementation@skanska.co.uk Application Cementation Skanska has a wide range of piling Can be used in a wide range rigs within the plant fleet, including crane-based of strata. units, and all-hydraulic purpose-built mast Where non-cohesive or machines. Both are suitable for the construction of water bearing soils exist temporary casings and/ large diameter cast-in-situ piles. or bentonite or polymer suspension can be used to Mast machines are self-erecting. Establishment progress the bores. time on site is shorter than for crane-mounts and Diameters range from for contracts with small sites and/or few piles, this 600mm to 3000mm with pile depths up to 72 metres can be an advantage. The crane-mounts are more and maximum working loads suitable for the larger diameter and deeper pile of 20,000kN for straight- shafted piles or 30,000kN for range. under-reamed piles. Advantages All of the rigs are fitted with a rotary boring unit • High load capacity which operates a kelly bar. The boring tools are • Can be used with fitted to the kelly bar. This equipment has been CEMLOC® to plunge structural steel columns used to construct large diameter piles in a wide • In stiff clays under-reamed range of strata, including very soft silty clays, non- bases can be formed to cohesive soils and weak rocks. increase pile capacity • Depending on ground conditions, pile concrete The rigs can impart a vertical load on to the kelly can be terminated below piling platform level. bar to improve production in difficult strata. Patents UK Serial No.