Page 26 - Consequences of an Incorrect Seismic Survey

Caissons

1. Rock socket length of 4.5m.

2. Hand-dug with cast-in-place full circumferential reinforced concrete

segmental linings.

3. The lining comprised inverted frustum-shaped segments and each

segment was 0.8m long.

4. It took 1 to 2 days to advance the caisson bore each segment in soil.

5. Each rock socket excavation took 2 to 3 weeks to complete.

6. Typically took up to 6 weeks to construct a caisson pile in soil to

bedrock 12m deep below.

7. Every 4m extra length caisson excavation in soil incurred about 10

extra days of construction per pile.

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