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在工程设计中,当拟建桥梁基础与拟建地下结构位置冲突时,通常做法是调整桥梁或地下结构位置,使之相互避让。但很多时候,由于功能需要,结构相互避让困难。本文采用了一种新的解决方案,即桥-隧共构。若地下结构体量较大,则选取较轻的梁型与合适的跨径,以地下结构作为桥梁的基础。结合工程实例,简要介绍了基础与地下空间共构的中小跨径钢梁的设计过程,主要包括桥型的选取、上下部结构布置形式、计算与分析过程、主要控制点、细节分析等。本文为初接触此类桥型的设计人提供了明确的设计思路与可靠的分析方法。
In engineering design, when the proposed bridge foundation conflicts with the location of the proposed underground structure, it is common practice to adjust the position of the bridge or underground structure so as to avoid each other. However, in many cases, due to functional needs, structures avoid each other’s difficulties. In this paper, a new solution is adopted, that is, bridge-tunnel structure. If the amount of underground structures is large, choose the lighter beam type and suitable span, with the underground structure as the foundation of the bridge. With the engineering examples, the design process of the medium and small-span steel beams with basic and underground structures is briefly introduced, including the selection of bridge types, the layout of the upper and lower structures, the calculation and analysis process, the main control points and the detail analysis. This article provides a clear idea of design and reliable analysis for designers who initially touch such bridges.