城市轨道交通建桥合一长联无缝高架车站结构设计与施工优化
雷少鑫周永礼鲁雪冬
Design and Construction Optimization for Elevated Long-link Seamless Urban Rail Transit Station with Bridge-building Unified Structure
LEI ShaoxinZHOU YongliLU Xuedong
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作者信息:中铁二院工程集团有限责任公司， 610036， 成都
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Affiliation:China Railway Eryuan Engineering Group Co., Ltd., 610036, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.03.013
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中图分类号/CLCN:U442.5; U231.4
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栏目/Col:研究报告
摘要:
［目的］建桥合一长联无缝高架车站将建筑与桥梁结构融合，使得车站墩柱在有刚度需求的同时，还具有空间框架结构体系复杂、体量大、超静定次数多的特点，而混凝土结构的温度与收缩徐变成为了这类车站结构设计中的控制因素。采用设置伸缩缝、加大墩柱截面尺寸、加强墩柱截面配筋等传统方法，将破坏车站结构的整体性，增加维护与建设成本。因此需从设计角度和施工角度对建桥合一长联无缝高架车站结构进行优化。［方法］以深圳地铁6号线宽9 m的岛式车站为研究对象，运用MIDAS软件，建立建桥合一的长联无缝高架车站有限元模型，并对其进行计算分析与检算。分别从设计和施工两个角度提出相应优化方案。从设计角度建立了高架车站有限元模型，对墩柱控制弯矩进行了对比分析。［结果及结论］有限元计算结果表明：车站两端墩柱受收缩徐变和温度的作用明显，其应力与配筋将是本设计的控制要点。在保证高架车站整体性的情况下，从设计角度提出了加深承台埋深，采用双薄壁墩，在墩柱顶部采用铰接等3种优化方案；从施工角度提出了设置后浇带，采用模块化装配式施工等优化方案。经模拟分析，加深承台埋深2 m，增加墩高减小桥墩刚度，可减少第13轴的墩底控制弯矩约22%；采用双薄壁墩大幅减小了桥墩刚度，可减少第13轴墩底的控制弯矩约46%；墩顶采用混凝土铰支撑，释放了上部传递至墩柱的弯矩，可减少第13轴的控制弯矩约13%。
Abstracts:
［Objective］ The elevated long-link seamless station with bridge-building unified structure integrates building and bridge and enables the station pier column to have stiffness requirements while possessing the characteristics of complex space frame structure system, large volume, and more statically indeterminable times. Therefore, temperature, shrinkage and creep of the concrete structure become the control factors in the design of such station structure. The traditional methods such as setting expansion joint, enlarging pier column section size and strengthening pier column section reinforcement will destroy the integrity of station structure and increase the maintenance and construction cost. It is necessary to optimize the structure of the unified long-link seamless elevated station from the aspects of design and construction. ［Method］ The island station of Shenzhen Metro Line 6 with 9m width is taken as research object. MIDAS software is used to establish a finite element model for the above station to calculate, analyze and verify the design. The optimization scheme is proposed from the aspects of design and construction respectively，a finite element model of the elevated station is established from the design point of view, and is used to compare and analyze the control bending moment of the pier column. ［Result & Conclusion］ The calculation results of the finite element model show that the pier columns at both ends of the station are obviously affected by shrinkage, creep and temperature, and the stress and reinforcement are the key control points of the design. Under the condition of ensuring the integrity of the station, three optimization schemes are proposed from the design point of view, such as deepening the buried depth of the cap, adopting double thin wall pier and using hinge connection at the top of the pier column. From the construction point of view, the optimization schemes such as setting up post-grouting belt and adopting modular assembly are put forward. Simulation analysis shows that the control bending moment of the 13th axis at the bottom of the pier can be reduced by about 22% by deepening the pier cap buried depth of 2m and increasing the pier height to reduce the pier stiffness. The stiffness of the pier is greatly reduced by using the double thin-wall pier, and the control bending moment of the 13th axis at the bottom of the pier is reduced by about 46%. The concrete hinge used at the pier top releases the bending moment transmitted from the upper part to the pier column, and reduces the control bending moment of the 13th axis by about 13%.
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