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A Self-Learning Manual - Institution of Engineers Mauritius

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A <strong>Self</strong>-<strong>Learning</strong> <strong>Manual</strong><br />

Mastering Different Fields <strong>of</strong> Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU<br />

15. What are the problems associated with prestressed concrete piles<br />

(Daido)? (PCP1)<br />

The origin <strong>of</strong> Daido piles comes from Japan where these prestressed<br />

concrete piles are used as replacement plies. Holes are pre-formed in the<br />

ground and Daido piles are placed inside these pre-formed holes with<br />

subsequent grouting <strong>of</strong> void space between the piles and adjacent ground.<br />

However, in Hong Kong Daido piles are constructed by driving into ground<br />

by hammers instead <strong>of</strong> the originally designed replacement method. Since<br />

the installation method <strong>of</strong> Daido piles is changed, construction problems<br />

like deformation <strong>of</strong> pile tip shoes, crushing <strong>of</strong> concrete at pile tip etc. occur.<br />

Reference is made to B. W. Choy (1993).<br />

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