Installation Scheme of the Splay Saddle in the Tunnel Anchorage of Tongzi River Bridge in Jinsha-Renhuai-Tongzi Expressway
As an important stress structure of the bridge,the anchorage of suspension bridges has various structural forms and is designed according to local conditions.Tunnel anchorage is often designed for the canyons in the western steep mountainous areas.Due to the special structural characteristics of the splay saddle which complies with the cable strand inclined into the anchor,it is generally inclined to be arranged in anchor chamber of the tunnel anchorage.According to the shape of the splay saddle,gravity,construction environmental conditions and other factors,the installation technology such as direct hoisting by large tonnage crane,sliding installation by laying slideway and hoisting by gantry can be used.In view of the design characteristics of the tunnel anchorage structure of the long-span suspension bridge project in the alpine gorge area,this paper introduces the overall scheme of the installation of the splay saddle,as well as the design scheme of the sliding support system for the installation of the splay saddle,and the construction technology by the support sliding method for hoisting the splay saddle in the large inclined tunnel anchorage on the shore of Renhuai.
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