Deep Excavation & Retaining Engineering

• Deep-excavation control focuses on deformation, groundwater, surrounding buildings, utility protection and staged support conversion.
• Multiple retaining and ground-improvement methods can be combined within the same project according to excavation geometry and surrounding constraints.
• Water-side pile systems require tight control of positioning, verticality, interlocking accuracy, transport and lifting operations.

Selected Applications

• Bilibili New Generation Industrial Park N5, Shanghai: The excavation area is approximately 19,900 m² with a perimeter of about 680 m and an excavation depth of roughly 22.1-22.9 m. Seven different construction methods were involved in the ultra-deep foundation-pit works.
• Hangzhou Qiantang Railway Station: The excavation is approximately 430 m long and 127 m wide, with excavation depths generally around 24-27 m. Diaphragm walls and bored-pile retaining systems were adopted, with diaphragm walls reaching about 68.1 m in length.
• Fuzhou Binhai Express Line F1 Nan Gongyuan Station: The station is approximately 174.3 m long, with a standard excavation depth of about 19.1 m and end-pit depth reaching about 20.9 m. The retaining structure uses 1.0 m diaphragm walls, three-axis mixing-pile trench reinforcement and three levels of concrete support.
• Zhanjiang Jingxin Donghai Power Plant Cofferdam: The water-side cofferdam used 820 mm PC interlocking steel pipe piles approximately 30-34 m long. Construction involved water transport, pile driving and extraction, steel waling and support installation/removal, and interlocking-accuracy control.

• 深基坑施工控制重点包括变形、地下水、周边建筑、地下管线保护及分阶段支撑转换。
• 可根据基坑形态和周边约束条件，在同一项目中组合多种围护与地基处理工法。
• 水上钢管桩体系重点控制定位、垂直度、锁扣咬合精度以及运输吊装组织。

代表性应用

• 上海哔哩哔哩新世代产业园 N5 地块： 基坑开挖面积约 1.99 万平方米，周长约 680 米，开挖深度约 22.1-22.9 米，属于超深基坑，施工涉及 7 种不同工艺。
• 杭州钱塘站站房工程： 基坑长约 430 米、宽约 127 米，总体开挖深度约 24-27 米；采用地下连续墙和灌注排桩支护，地连墙最大长度约 68.1 米。
• 福州滨海快线 F1 线南公园站： 车站总净长约 174.3 米，主体标准段开挖深度约 19.1 米，端头井深度约 20.9 米；围护结构采用 1 米厚地下连续墙、三轴搅拌桩槽壁加固及三道混凝土支撑。
• 湛江京信东海电厂围堰工程： 水上围堰采用直径 820 毫米 PC 锁扣钢管桩，桩长约 30-34 米。施工涉及水上运输、打拔、钢围檩、支撑安拆及钢管桩锁扣精度控制，围堰一部分位于水中，一部分穿越大堤进入滩土区域。