gateway 桥梁节段施工.pdf

GATEWAY BRIDGE APPROACHES – MATCH CASTING OF BOX SEGMENTS Peter Rotolone1 B.Eng(Civil), M.Eng.Sc., RPEQ Abstract Construction is well underway for a second Gateway The duplicate Gateway Bridge is positioned approximately Bridge across the Brisbane River in Brisbane, Queensland. 50m downstream from the existing structure. The external The bridge approaches either side of the main river span side view pro les of the duplicate bridge and columns are consist of precast concrete box segments constructed using similar to the existing bridge. When completed there will a match casting process to ensure a very closely tting joint. be obvious differences in the plan view as the downstream The segments are jointed together with epoxy paste and side of the new bridge has an additional 4.5m width lane structurally joined by post-tensioning. The match casting dedicated for use by pedestrian and bicycle traf c. At method was found to be more ef cient and cost effective strategic locations on the bridge structure, a number of than the cast-in-situ joints used on the previous bridge. viewing platforms will be provided for pedestrians. There are load capacity and construction detail differences, both in Introduction the superstructure, substructure and foundations (3). The existing Gateway Bridge was constructed by Trans eld (Qld) and was of cially opened on 11 January 1986. Since The similar side pro le of the bridges belies the then, steady traf c growth has meant that the bridge has differences in construction techniques and methods used progressively reached full capacity. The Gateway Upgrade to accommodate thermal expansion. This a