R3K01

From the Mei Foo to Rambler Channel Bridge section, Route 3 is an elevated expressway, 3 km in length. The construction of this section makes use of precast U-section beams with an average span of 34 m, which are lifted to the top of the portal by the beam launcher. In the early stage of construction, a portal frame constructed of in-situ concrete is used to support the precast beams and the bridge deck on top. The supporting rail of the launcher is then erected on the top of the portal frame. By using this launcher, the precast concrete beams are lifted and placed on the frame to support the bridge deck. The red steel beam seen in the photo is the supporting rail of the launcher. The Airport Railway Viaduct can also be seen below the portal frame