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当施工场地受限,主梁1#段不能利用标准挂篮进行施工时,可利用无后锚前支点挂篮进行施工。根据无后锚前支点挂篮关键部位的受力限值和特殊约束条件合理确定了1#索的第一、二次张拉力,验算了无后锚前支点挂篮在各受力工况下的安全性,计算了1#段前端在各工况下的挠度,为1#段的施工预拱度提供了理论依据。该施工方法可用于0#块较短同时1#块又不便于采用支架(托架)施工的情况。
When the construction site is limited, the main girder 1 # section can not use the standard hanging basket for construction, can be used without the anchor before the fulcrum hanging basket construction. The first and second tensions of cable # 1 were reasonably determined according to the force limit and special constraints of the key parts of the former anchor-point cradle without post-anchor. The deflection of 1 # section front end under each working condition is calculated, which provides a theoretical basis for the construction camber of section 1 #. The construction method can be used for 0 # block shorter while 1 # block and not easy to use bracket (bracket) construction.