To Kwa Wan – Kai Tak: steel walers for a tunnel cofferdam
Steel waler and strut frames to brace the sheet-pile walls of a tunnel cofferdam, drawn in 3D for fabrication.
- Year
- 2019
- Location
- To Kwa Wan and Kai Tak, Kowloon
- Status
- Completed
- Category
- Temporary works
A cofferdam for a shallow tunnel is only as good as the steel that holds its walls apart. In March 2019 we drew the waler and strut frames for a cofferdam between To Kwa Wan and Kai Tak: continuous walers along each sheet-pile wall, cross struts between them, and the details where they meet existing pipe piles and block walls. The 3D drawings let the fabricator see every connection before cutting steel.
From the drawings
The frame spans 14 m, with double 432 × 102 mm channel walers at +3.55 mPD and Ø273 × 12 mm tube struts, about 12 tonnes of steel in all.
Drawings
