Job Book 9th Edition - Book - Page 128
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Stage 1 > Preparation and Brief: Supplementary Material: 1/SM5
The field work should be supervised by the structural engineer, and daily liaison
should be maintained so that any variations indicated by the borehole findings
can be made. Daily site records of boreholes should be sent to the structural
engineer stating:
• borehole numbers and location
• date and times of boring
• type of plant and method of boring
• diameter of boring casing and core
• description of strata and depth of base of each stratum
• level at bottom of casing when sample taken, or in situ test carried out on
each core drilled
• depths at which each sample was taken and in situ tests made
• water levels.
On completing the site work, the contractor should submit to the structural
engineer preliminary borehole logs together with a list of samples so that
instructions can be given for laboratory testing.
The final site investigation should be submitted as a draft (for approval of its
form, not content). Unless otherwise specified it should contain:
• description of work carried out (i.e. site and laboratory work)
• borehole logs
• laboratory test results, including geological classification, index properties,
acidity, sulphate content, etc.
• records of water levels in standpipes and/or piezometers installed in
boreholes, with notes of any variations
• results of strength tests
• diagrammatic cross-section through site showing trial holes related to a
datum and assumed connecting geological structure, water table, etc.
• plan showing position of trial holes, incorporated with main survey plan if
appropriate.
Surveys of existing buildings
It is essential that the architect personally walks through every room in the
building to be surveyed, regardless of whether the survey is being done by inhouse personnel or by a surveying firm. It is important to perceive the architectural
character of a building and the way it has been constructed.
The measured survey drawings might show:
• plans, sections, elevations
• elevational features, e.g. plinths, string courses, openings
• precise levels at floors, datum, thickness and construction
• levels of external ground
