Fleming Road culvert: floating in a seal plate
A culvert survey every 40 m and a method for floating a 500 kg seal plate into a flooded culvert and fitting it by hand.
- Location
- Wan Chai, Hong Kong Island
- Status
- Completed
- Category
- Hydraulic
The culvert under Fleming Road in Wan Chai had to be sealed at one end while it was still full of water, with no room for a crane inside.
We first surveyed the culvert and drew it section by section from CH0 to CH160, then designed the seal plate and a way to get it in:
- Divers use floats to bring a lifting frame and a small working platform to the seal position.
- The 500 kg plate is floated in on 200 kg air floats, towed over pulleys.
- Air is let out of the floats on one side so the plate tilts upright.
- A 1-tonne chain block on the frame lifts it onto its seat.
From the drawings
The work was in December 2012. Alongside it, at the To Kwa Wan seawater pump house, we replaced six pairs (twelve) of cast-iron screen rails with custom grade 316 stainless rails, fixed with 288 chemical anchors of Ø20 × 200 mm, by two divers and two technicians in five days.
Drawings
