摘要
泉州湾跨海大桥海上引桥为多联3×70 m无支座预应力混凝土连续刚构桥,联间设置交接墩,交接墩与主梁固结,联间主梁设置15 cm宽梁缝。针对梁缝支撑与平面模板的安装及拆除难度较大问题,提出2种梁缝施工方案:方案1为梁缝支撑与平面模板同步安装,方案2为先安装平面模板后安装梁缝支撑,综合考虑梁缝支撑体系现场安装及后期梁缝支撑拆除施工工效,尽可能减小施工难度,选用方案1作为梁缝施工方案。通过试验对比分析方案1中梁缝支撑与平面模板的力学性能,选取1块10 mm厚钢板+2块21 mm厚维萨板+1块10 mm厚钢板作为梁缝支撑体系。该桥采用该梁缝支撑体系,实施效果较好。
The sea approach of Quanzhou Bay Sea-crossing Bridge is a bearing-free prestressed concrete continuous rigid-frame bridge that contains nine units of three spans of 70 m.The junction piers between the continuous units are fixed with the main girder,and there is a 15 cm-wide pour strip in the girder over each juncture pier.The construction of the pour strips was challenged by the installation and demolition of the supports and formwork.To address this issue,two construction schemes were proposed,namely to install the supports and formwork simultaneously(scheme 1)or to install the formwork ahead of the supports(scheme 2).In order to improve the field installation efficiency of the supporting system and the demolition efficiency after completion of pouring and to facilitate the construction,scheme 1 was chosen.Tests were conducted to investigate the mechanical properties of the supports and formwork in the pour strips in scheme 1,and a supporting system consisting of a 10 mm-thick steel plate,two 21 mm-thick Visa plate and a 10 mm-thick steel plate was determined.The implementation effect of the supporting system in the pour strips construction in the Quanzhou Bay Sea-crossing Bridge is good.
作者
杜俊
翁方文
DU Jun;WENG Fang-wen(CCCC Second Harbor Engineering Co. ,Ltd. ,Wuhan 430040,China;Key Laboratory of Large-Span Bridge Construction Technology,Ministry of Transport,Wuhan 430040,China)
出处
《世界桥梁》
北大核心
2021年第6期46-51,共6页
World Bridges
基金
中国铁路总公司科技研究开发计划课题(K2018G017)。
关键词
连续刚构桥
多联无支座
梁缝支撑
模板
维萨板
方案比选
施工技术
continuous rigid-frame bridge
multiple continuous units and bearing free
supports for girder pour strip construction
formwork
Visa plate
scheme comparison
construction technique
