任意温度下拱圈标高预抬量的确定研究  

Study on the Determination of the Pre-Lift Amount of Arch Ring Elevation at Arbitrary Temperature

作　　者：孙伟 SUN Wei(China Railway 17th Bureau Group Co.Ltd.,Taiyuan Shanxi 030006,China)

机构地区：[1]中铁十七局集团有限公司,山西太原030006

出　　处：《铁道建筑技术》2024年第3期48-52,共5页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研发计划项目(2022-C18)。

摘　　要：针对大跨度钢筋砼拱桥悬臂浇筑过程中受环境温度影响的问题,拱圈的立模标高往往需要在温度稳定时进行放样,鉴于此,本文基于功互等定律推导出了任意温度下拱圈标高预抬量的范式,来保障拱圈线形达到设计线形。以净跨径为200 m的娅石庆特大桥为工程背景,通过将现场监测的温度数据代入推导的公式中,得出现场任意温度下需要放样的拱圈立模标高,并将现场监测的拱圈线形与设计线形进行对比,结果表明:监测的主拱圈合龙后底模标高与理论标高相比,最大误差仅为1.1%,标高最大相差1.3 cm,由此验证了提出的考虑任意温度下拱圈标高预抬量公式的正确性和推导过程的合理性,可为后续研究者提供理论参考。In view of the problem that the cantilever of a large span reinforced concrete arch bridge is affected by the ambient temperature in the process of cantilever casting,the standing mold elevation of the arch ring often needs to be released when the temperature is stable.In view of this,this paper derives a paradigm for the elevation pre-lift amount of the arch ring at any temperature based on the law of work equivalence to ensure that the arch ring alignment reaches the design alignment,Taking the Yashiqing Bridge with a net span of 200 m as the engineering background,by substituting the temperature data monitored on site into the derived formula,the standing mold elevation of the arch ring to be released at any temperature on site is derived,and the arch ring alignment monitored on site is compared with the design alignment.The results show that the maximum error is only 1.1%when the monitored arch axis of the main arch ring after its closure is compared with the design arch axis considering the pre-arch degree,and the maximum difference in elevation is 1.3 cm,which verifies the correctness of the proposed formula for the elevation pre-lift amount of the arch ring under the consideration of arbitrary temperature and the reasonableness of the derivation process,and can provide theoretical reference for the subsequent researchers.

关 键 词：公路桥梁 预抬量公式 立模标高 钢筋砼拱桥 悬臂浇筑 任意温度 

分 类 号：U445.466[建筑科学—桥梁与隧道工程] U448.22[交通运输工程—道路与铁道工程]