Page 25 - Consequences of an Incorrect Seismic Survey

Hand-dug Caissons where Bedrock was less than 12m Deep

• Caisson piles ranged in sizes from 1.6m to

3.3m in diameter – giant sized boreholes!

• Socketed into bedrock.

• Grade 35 concrete employed.

Side note:

Very large and deep hand-dug caissons are

supporting very tall buildings in Singapore.

1. The 52-storey DBS Building on Shenton Way

in Singapore supported on just 4 nos. of 7.3m
dia. caissons constructed to the depths

varying from 39.6m to 64m was amongst the

first of such.

2. The 62-storey OUB building is founded on 7

nos. of 5m to 6m dia. caissons constructed to

Photograph by Courtesy of Kong SY the depths of 80m to 100m. 25