基于经典力学法的地铁门洞式支架可靠性应用研究
Reliability Application Research of Subway Door Opening Bracket Based on Classical Mechanics Method

针对盾构掘进始发与地铁车站施工存在的冲突问题，提出将门洞式支架应用于盾构机组装区，以确保盾构机组的组装工作，并确保车站主体结构与盾构始发能够同时交叉施工，进而提高施工作业效率，缩短工期。以昆明市轨道交通2号线二期工程某车站工程实践为例，从支架设计、验算、施工工艺、搭设及拆除要求等方面，通过采用经典力学计算方法，对地铁门洞式支架结构进行了力学模型简化，构建了均布荷载单跨简支梁以及受压稳定杆件模型，对支架的可靠性进行了计算研究。通过后续实际施工可见门洞式支架整体结构稳定，能够满足地铁运营的要求，证实了经典力学计算方法在地铁施工中的可行性。
In view of the conflict between shield tunneling and subway station construction, it is proposed to apply the portal bracket to the shield machine assembly area, so as to ensure the assembly work of the shield machine unit, and ensure that the main structure of the station and the shield starter can be cross-constructed at the same time, thereby improving the efficiency of construction work and shortening the construction period. Taking the engineering practice of a station of the second phase project of Kunming Rail Transit Line 2 as an example, from the aspects of bracket design, check calculation, construction technology, erection and dismantling requirements, etc., by using the classical mechanical calculation method, the subway door-type bracket structure is mechanically carried out. The model is simplified, the model of a single-span simply supported beam and a compressive stable member with uniform load is constructed, and the reliability of the support is calculated and studied. Through subsequent actual construction, it can be seen that the overall structure of the portal support is stable and can meet the requirements of subway operation, which proves the feasibility of the classical mechanical calculation method in subway construction.