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Ground Stability, Foundations and Substructures 159<br />

Lightly reinforced concrete<br />

wall provides a smooth and<br />

clean surface for the bitumen<br />

tanking to be applied and helps<br />

to resist hydrostatic pressure<br />

Reinforcement<br />

The interlocking secant piles<br />

help to resist hydrostatic<br />

pressure and retain the<br />

ground<br />

Sheet tanking is laid under the<br />

structural floor and turned up<br />

against the concrete wall<br />

Once all of the tanking is fixed<br />

to the concrete wall, a further<br />

concrete wall will be cast<br />

against the tanking, trapping<br />

the tanking and preventing<br />

hydrostatic pressure pushing<br />

the tanking off the wall<br />

Photograph 3.19 Secant piling and internal tanking (courtesy of D. Highfield).

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