琴键型大跨度基坑栈桥体系设计关键技术研究

Research on Key Design Technology of Keyboard-type Long-span Foundation Pit Trestle System

摘要:

依托深圳市宝鹏通道工程（简上路—龙景立交）工程，提出一种新型基坑栈桥体系并进行设计关键技术研究。建立不含栈桥体系的基准模型以及加入栈桥体系的完整模型。对基准模型进行建模计算，并通过与FRWS9.0的计算结果进行对比，得到无栈桥情况的基准结果的同时，验证其准确性。再对完整模型进行计算，并与基准模型进行对比，结果表明：加入栈桥体系后，基坑表现出明显的非对称受力特点，根据栈桥板、第一道栈桥梁/支撑、立柱和地连墙等关键构件的计算结果提出针对性的设计建议。

Abstract:

Relying on the Shenzhen Baopeng Channel Project (Jianshang Road to Longjing Interchange), a new type of foundation pit trestle system is proposed and its key design technologies are studied. A benchmark model without trestle system and a complete model with trestle system are established for the foundation pit of this project. The benchmark model is modeled and calculated, and comparing with the calculation results of FRWS9.0, the benchmark results without trestle are obtained, and its accuracy is verified. Then the complete model is calculated, and its result is compared with the benchmark model. The results show that the foundation pit shows obvious asymmetric stress characteristics after adding the trestle system. According to the calculation results of key components such as trestle slab, first trestle beam / support, column and diaphragm wall, the targeted design suggestions are put forward.