Dragages brings new technology to Hong Kong bridge-building

The construction of the Kwun Tong Bypass transformed bridge-building in Hong Kong.

For the first time a 120-metre long “launching girder” was seen in operation. The specialist equipment was brought to Hong Kong following its successful use by the Bouygues Group in projects overseas.

The 450-tonne, steel structure was designed to move both forward and transversely, allowing for the lifting of two segments at one time.

The 2,206 pre-cast segments, some weighing as much as 80 tonnes, were then glued together and secured by prestressing. The new method allowed Dragages to complete a bridge span in three days by laying approximately 20 segments.

Such was the success of the new technique, the project was completed within 29 months, a full year ahead of the original plan.