上坡米1号大桥边跨合龙和现浇段设计与施工方案优化

发布时间：2019-01-09 10:18

【摘要】：上坡米1号大桥跨径布置为(6×40 m)T梁+(72+120+120+72)m预应力混凝土连续刚构+(3×40 m)T梁,连续刚构主桥两个过渡墩分别为69.91、58.37 m,原设计边跨现浇段和合龙段长分别为11 m和2m,施工采用吊架承重结构体系。由于施工过程中跨配重吨位大,施工控制比较难,一旦在某个施工环节出现疏忽,产生的轻则是不可逆转的质量问题,重则是质量安全事故。为此,工程师们围绕缩短边跨现浇段长度来优化边跨合龙与现浇段设计施工方案,并成功研究出先合龙中跨、挂篮不对称悬浇18号梁段3.5 m+墩顶托架现浇段5.5 m+挂篮施工合龙段4 m的边跨合龙与现浇段设计施工方案。
[Abstract]:The span of the No. 1 Bridge is arranged as (6 脳 40 m) T beam (72 120 120 72) m prestressed concrete continuous rigid frame (3 脳 40 m) T beam), and the two transition piers of the continuous rigid frame main bridge are 69.91 ~ 58.37 m, respectively. The length of the cast-in-situ section and the closure section are 11 m and 2 m respectively in the original design. Because of the large tonnage of span weight in the construction process, it is difficult to control the construction. Once there is negligence in some construction link, the light is an irreversible quality problem and the heavy one is a quality safety accident. For this reason, engineers have optimized the design and construction scheme of side span closure and cast-in-place section around shortening the length of side span cast-in-place section, and successfully studied the middle span with first closing span. Design and construction scheme of side span closure and cast-in-place section of side span and cast-in-place section of closing segment 4 m in construction of 5.5 m hanging basket construction of 3.5 m pier top bracket of 18 beam segment with asymmetric hanging basket.
【作者单位】：湖南省高速公路管理局;中南大学土木工程学院;
【分类号】：U442.5;U445.4

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