Appendix D Geotechnical report · MCU18/0013

Project No. 304-2014
November, 2004 Page 12

 

These requirements do not override minimum footing levels.

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Trench £ 7

Found footings
below these lines

 

 

 

 

 

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High Level Footings

 

 

It is recommended that the footings be poured as soon as possible following excavation.
Where the footings cannot be poured within a short period of time it is recommended that
a blinding layer of concrete, at least 50mm thick, be placed immediately following

excavation, cleaning and inspection of the footing bases.
Piles

As mentioned above, both cast insitu or preformed piles may be suitable on this site.
However, given the sandy soils, it is unlikely that unsupported bored pile excavation could
be successfully achieved. Casing or other forms of hole support would be necessary for
conventional bored piles. Continuous flight auger (CFA) piles may be a suitable
alternative cast insitu type pile. This type has the advantage of not requiring any casing

or other support, even when drilling loose sand.

Preformed driven or pushed piles may also be suitable, however the environmental
constraints that may be present at this site might preclude driven piles due to the noise
and vibration associated with this method. Pushed-in piles avoid these problems, but a
push-in rig of sufficient reaction capacity may not be able to successfully negotiate the

sloping site.

 

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