云阳长江公路大桥施工控制

结合云阳长江公路大桥的施工监控实践,简述了该桥施工控制结构分析方法、施工控制体系和施工控制正装计算各标准梁段4个施工工况的划分。详细论述了主梁悬臂施工立模标高的确定方法,并给出了主梁悬臂施工立模标高的计算公式,同时阐述了受温度、结构体系转换、施工荷载、混凝土在施工阶段的收缩徐变以及挂篮的非力学因素变形等因素影响后的主梁施工梁段立模标高修正值的确定方法。简述了该桥索力测试与索力调整方法、截面混凝土应力测量方法。施工控制结果表明:成桥后主梁线形平顺,索力与主梁内力控制在了允许的范围内。

Construction Control of a Highway Cable-stayed Bridge on the Yangtze River

With the experience of the construction control of a highway cable-stayed bridge on The Yangtze River,the construction control structural analysis method,the construction control system and how to divide each standard section of the beam into 4 construction operating modes of calculation are summarized.The calculation method of mould absolute altitude of the beam cantilever construction is discussed,and the calculation formula of mould absolute altitude of the beam cantilever construction is given,at the same time the method of correction of mould absolute altitude of the beam construction have been discussed.The factor that affects the beam mould absolute altitude includes temperature,structural system conversion,construction load,contract of concrete in construction stage as well as the non-mechanical factor of basket warps.The bridge cable stress test,cable stress adjustment method and section concrete stress measurement technique are summarized.Construction is controlled as a result that the beam line shape is smooth going and cable stress and beam stress are in the scope of promise.