Core Viewpoint - The completion of the main structure of the Xiaowangbu Station marks significant progress in the construction of the Qingdao Metro Line 2 Phase II, showcasing innovative construction techniques and addressing various challenges in the project [1][3]. Group 1: Project Overview - Xiaowangbu Station is the first station of the Qingdao Metro Line 2 Phase II, featuring a two-level underground structure with a total length of 282.8 meters and a maximum width of 53.6 meters, approximately double that of a standard station [1]. - The station is strategically located at the intersection of major traffic routes in Qingdao, facing challenges such as poor geological conditions, dense pipelines, and heavy traffic [1]. Group 2: Construction Innovations - The construction team employed a combination of "open-cut and half-width cover excavation" methods to ensure road traffic and construction could proceed simultaneously [3]. - A "three-stage pouring method" was developed to tackle the challenges of ultra-high concrete side wall construction, achieving "zero misalignment and zero leakage" in a limited operational space of 0.92 meters [3]. - The introduction of a semi-automatic mobile large-scale ultra-high steel formwork trolley increased the formwork turnover rate to 12 times, saving 0.15 cubic meters of concrete per meter and reducing carbon emissions by 18% [3]. Group 3: Construction Efficiency - During peak construction periods, 320 workers operated around the clock, achieving a maximum daily excavation volume of 3,300 cubic meters [3]. - The installation of 79 steel pipe columns, each weighing 12 tons, was optimized through techniques such as hole drilling and numerical control positioning, resulting in an installation precision error of less than 3 millimeters [3].