为解决京张高铁清河火车站地下交通枢纽负1层的地下人行通道、公交通道和地下连廊通道需要和清河火车站同时投入运营，而常规的明挖顺作工序无法满足工期要求的问题，提出分体建造方案。即：
先采用明挖顺作法完成负1层结构和永久钢管柱的施工，以满足负1层结构和清河站同步投入运营的需求，然后采用盖挖法施工负2层结构。主要研究与结论如下： 1）讨论分体建造的施工工序以及钢管柱施工、明挖+盖挖连接节点的处理、负2层钢支撑安装与拆除、负2层施工对钢管柱稳定性影响的控制等分体建造方案关键技术，并针对关键技术提出了解决措施； 2）采用有限元数值模拟方法并结合现场监测结果，分析施工过程中的结构关键受力构件钢管柱的变形，得出钢管柱的竖向变形和水平变形均远远小于设计允许的变形控制值； 3）从总工期、工程造价和实施效果进行分析，本工程采用的分体建造工法不占优势，但由于负1层施工仅仅81 d就完工交付使用，确保了负1层的各种交通设施能够随清河站的开通同步投入运营，提出的分体建造工法为高铁车站地下交通枢纽按期投入运营提供了保障。
Since the underground pedestrian walkway, bus
passageway, and underground corridor on the first floor of the underground
transportation hub structure of the Qinghe railway station of Beijing-Zhangjiakou
high-speed railway has been operational simultaneously
with the Qinghe railway station, the conventional open-cut
construction scheme cannot meet the requirements of the targeted construction
period. As a result, the split construction scheme is proposed and applied. The
split construction method includes constructing the underground first-floor structure and steel tube columns using the opencut method and constructing the underground second floor using the
cut-and-cover method. The main
studies and conclusions are drawn as follows: (1) The split construction
sequence, steel tube column construction, connection point between opencut and cutandcover
methods, steel support installation and demolishing in the underground second
floor, and the influence of constructing the underground second floor on the
stability of the steel tube columns are discussed, and corresponding methods
are proposed. (2) The deformation of essential stress structures, steel tube
columns, and the construction period is analyzed by finite element numerical
simulation and site monitoring results. The analytical results show that the
vertical and the horizontal deformation of the steel tube column is
considerably lower than the steel tube column allowance. (3) The split
construction in this project is not beneficial in terms of the construction
schedule, cost, and effect, but the synchronous operation of each traffic
facility and Qinghe station was guaranteed, indicating a possibility of
constructing the underground transportation hub structures and highway station.
