Investigations are undertaken in general accordance with BS5930 and if applicable, BS10175. They can be undertaken on the basis of a prior desk study or upon the requirements of the client or their structural engineer.
Below is a summary of the typical methods which may be employed in a site investigation.
Standard rig towed by a land rover or specialist cut-down dismoutable rig on a trailer. Can achieve depths up to 50m in favourable conditions and carry out in-situ SPT testing. Information obtained can be used in piled foundation design.
Hand held equipment for restricted access sites. Cost-effective borehole construction upto 5m depth with hand augers or pneumatically driven window sample tubes.
Tracked DPH rig or DPSH 'Terrier' Rigs for difficult or sloped terrain. These can carry out in-situ dynamic probing upto 20m and sample upto 5m.
Generally carried out in very dense soils or bedrock. Core samples can be taken or in-situ SPTs carried out. A variety of rigs can drill upto 150m depth.
Mechanical or hand dug trial pits. Hand dug trial pits can be used to expose existing foundations and establish their depth. Soakaway testing to BRE365 is carried out in trialpits.
Coring of roads and floor slabs up to 150mm diameter. This allows neat reinstatement and is useful in heavy traffic locations such as petrol station forecourts. The rig is electric, dismantlable and can be taken through a standard doorway.
Albury Site Investigation
