Installations
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Datum Installations
Deep Seated Datums are installed by drilling into the ground (usually at a 6m depth) using either our Restricted Access CFA rig or by hand. Once the depth is reached, the datum rod is installed. From this fixed datum point, level readings can be referenced.
The deep seated datum should be placed at the furthest point of any site influences.
Standpipes / Piezometers
Simple standpipes to measure the hydrostatic head of groundwater are formed in boreholes using 50mm diameter pipe. The details of individual installations are provided on borehole records. Typically the lower length is formed in slotted pipe, with the upper 1m un-slotted. The annulus between the riser pipe and the borehole wall is filled with clean granular material. Details of any bentonite seals or grouting are given on the borehole records. A removable gas tap is fitted where gas monitoring is required and standpipes typically have a metal access cover concreted in at ground level.
Standpipe piezometers are formed by using a Casagrande type piezometer tip at the base of the pipe, set in a granular response zone of sand or pea gravel. The response zone is isolated from the strata above and below by placing 500mm thick bentonite seals. The remaining annulus above the bentonite seal is filled with a cement bentonite grout or similar.
Mission Statement
At Chelmer we aim “to ensure the longevity of our company through repeat and referral business achieved by customer satisfaction in all areas including timeliness, attention to detail and service-minded attitudes.”
Working with Structural Engineers, Architects, Building Developers, Consulting Engineers, Piling Contractors, Loss Adjusters, Insurance Companies, Local Authorities and Housing Associations and the Private Householder.
Chelmer Global Ltd: Site Investigations, Laboratory Testing, Consultancy, Drainage, Surveys & Monitoring Remediation of Contaminated Land and Subsidence Services
Chelmer Global Ltd (Head Office)
43 Hullbridge Road
South Woodham Ferrers
Chelmsford Essex
CM3 5NG
Head Office: +44 1245 400 930
Email: info@siteinvestigations.co.uk
Email: info@chelmerglobal.co.uk