铁道标准设计2025，Vol.69Issue(5)：95-102,8.DOI:10.13238/j.issn.1004-2954.202306260005
洪奇沥公铁两用大桥主桥边跨组合梁设计及施工方案研究
Study on Design and Construction Schemes for Side-Span Composite Girders of Main Bridge of Hongqili Road-Rail Bridge
摘要
Abstract
The Hongqili Road-Rail Bridge is a key control project for the newly-built Shenzhen-Jiangmen railway.The bridge adopts a double-deck configuration with an 8-lane urban expressway on the upper deck and a 4-track railway on the lower deck.Its main bridge uses a(3 × 100+808+3 × 100)m cable-stayed bridge with ultra-short side spans,utilizing steel-concrete box-truss composite girders.It has a span crossing the Hongqili waterway with no existing engineering reference.Based on construction feasibility,structural characteristics,and technical-economic considerations,the design and construction scheme for the side-span main girder structure were studied.The results showed that the main girder adopted a laminated slab-truss composite girder with rectangular concrete-filled steel tube,integrating structural stress with cable anchorage counterweights.During the construction of the side span,it fully utilized the inherent high bearing capacity of the continuous steel truss girder and the advantage of using prefabricated slabs as formwork for cast-in-place laminated slabs.reducing formwork and temporary work with significant economic benefits.The steel truss girder was erected using"longitudinal segmentation and transverse block installation+multipoint incremental launching"construction scheme,effectively resolving navigation constraints for transporting ultra-wide,ultra-high steel truss girders and accommodating the assembly of large-tonnage steel girders for side spans on the bank.For side span construction,a partial temporary pier support scheme was adopted,reducing the reaction force of temporary piers by 46.2％compared to a full support scheme.It minimized temporary work and avoided construction interference from the main span erection on side span concreting when no temporary pier was arranged.The construction of laminated slab-truss composite girder ensured high quality.The cast-in-place concrete adopted a segmented concreting scheme of"compression zones before tension zones,inside pipes before outside pipes".Compared to a single concreting scheme,this reduced the maximum nominal tensile stresses by 81.8％on the upper deck and 76.0％on the lower deck,effectively improving concrete structural stress.关键词
公铁合建桥/斜拉桥/叠合板-桁组合梁/结构设计/施工方案Key words
road-rail bridge/cable-stayed bridge/laminated slab-truss composite girder/structural design/construction scheme分类
交通工程引用本文复制引用
刘振标,夏正春,印涛,胡方杰,徐伟伟,姜洪劲..洪奇沥公铁两用大桥主桥边跨组合梁设计及施工方案研究[J].铁道标准设计,2025,69(5):95-102,8.基金项目
中国国家铁路集团有限公司科技研究开发计划课题(N2021G034) （N2021G034）
中国铁建股份有限公司科研计划课题(2021-B17) （2021-B17）
中铁第四勘察设计院集团有限公司科技研发课题(2018K001,2020K004,2021K015) （2018K001,2020K004,2021K015）
