超大竖井整体提升式模筑衬砌施工技术
Construction Technology of Integral Lifting Formwork Lining for Super-large Shaft
周宝宏 1王星 2黄帅 2康金刚 2杜俊波 2张斌斌 1陈立强1
作者信息
- 1. 中交第二公路工程局有限公司,陕西 西安 710065
- 2. 中交第二公路工程局有限公司,陕西 西安 710065;中交集团山区长大桥隧建设技术研发中心,陕西 西安 710199
- 折叠
摘要
依托天山胜利隧道 3 号竖井,提出超大竖井整体提升式模筑衬砌施工技术,在井筒初期支护模筑混凝土内侧安装 2 块独立的半月牙形整体上行式液压金属模板,采用 8 台稳车同步提升,通过模板周身多个浇筑口连续、均匀、对称地浇筑混凝土,保证超大竖井衬砌快速和高质量施工.对单块模板吊装、模板整体起吊、混凝土浇筑工况下模板变形及强度特征进行分析,并对横肋、纵肋、限位杆等关键构件连接部位建立局部受力分析模型进行计算,保证模板设计的合理性与安全性.研究结果表明,单块模板吊装、模板整体起吊、混凝土浇筑工况下模板、横肋、纵肋、限位杆受力及变形均满足要求;超大竖井整体提升式模筑衬砌施工技术机械化程度高,实现平均 200m/月的施工效率,保证浇筑混凝土在模板内有足够的水化反应时间,提高混凝土早期强度,确保施工质量.
Abstract
Based on the No.3shaft of Tianshan Shengli Tunnel,the integral lifting formwork lining construction technology for super-large shafts was proposed.Two independent half-moon shaped monolithic upward hydraulic metal formwork were installed on the inner side of the shaft initial support molding concrete,which was lifted synchronously by eight steady trucks.The concrete was poured continuously,evenly and symmetrically through multiple pouring ports around the formwork to ensure the rapid and high-quality construction of the super-large shaft lining.The finite element analysis program was used to study the deformation and strength characteristics under the working conditions of single formwork lifting,formwork integral lifting and concrete pouring.A local force analysis model was established for the intersection of key components such as transverse and longitudinal ribs and limit bars to ensure the rationality and safety of the formwork design.The research results show that the stress and deformation of formwork,transverse rib,longitudinal rib and limit bar meet the requirements of the specifications under the conditions of single formwork lifting,formwork integral lifting and concrete pouring.The integral lifting formwork lining construction technology for super-large shafts has a high degree of mechanization,achieving an average construction efficiency of 200m per month.It ensures that the poured concrete has enough hydration reaction time in the formwork and improves the early strength of concrete.It can also ensure the quality of construction.
关键词
隧道/竖井/模板/衬砌/混凝土/施工技术Key words
tunnels/shaft/formwork/lining/concrete/construction引用本文复制引用
基金项目
新疆维吾尔自治区重大科技专项(2020A03003)
新疆维吾尔自治区重大科技专项(2020A03003-6)
出版年
2024
NETL
NSTL
万方数据