V形墩及0#块自平衡施工组合支护体系受力分析

Force Analysis of Self-balancing Composite Support System for V-shaped Pier and 0# Block

摘要:

V形墩以其结构轻巧、受力合理且造型优美，在城市桥梁中得到广泛应用，但因V形墩具有特殊墩身结构形式，在墩身及0#块施工阶段易对支护体系产生较大水平分力，线形控制难度大，且易产生墩底内部裂缝，施工期质量、安全成为品质工程的一大难题。以宁波舟山港六横公路大桥——梅山水道跨堤桥V形墩身及0#块施工为背景，根据现场施工条件及安全、质量、成本控制需要，对梅山水道跨堤桥V形墩身及0#块施工开展了系列研究，提出了一种自平衡组合支护体系。分别以理论计算分析、数值模拟分析对自平衡组合支护体系在V形墩身及0#块施工全过程的受力情况进行研究分析，二者取得较为一致的结果。计算结果及实际工程应用表明：自平衡施工组合支护体系能较好地平衡V形墩及0#施工过程中的水平分力，有效地保障了墩身线形，并降低了墩底出现裂缝的风险。自平衡组合支护体系具有受力-传力机制明确、结构体系安全性高、施工成本低等优点，可为V形墩施工质量、安全提供有效保障。

Abstract:

The V-shaped pier is widely used in urban bridges due to its lightweight structure, reasonable force distribution and beautiful shape. However, due to the special form of pier body structure, the V-shaped pier is prone to generate the greater horizontal forces on the support system during the construction of pier body and 0# block. The linear control is difficult, and the internal cracks are prone to occur at the bottom of the pier. The quality and safety during construction have become a major challenge in the quality engineering. Therefore, taking the construction of the V-shaped pier body and 0# block of the Meishan Waterway Bridge crossing embankment — Liuheng Highway Bridge in Ningbo Zhoushan Port as the background, and based on the on-site construction conditions and safety, quality and cost control needs, a series of studies are conducted on the construction of the V-shaped pier body and 0# block of the Meishan Waterway Cross-embankment Bridge, and a self-balancing composite support system is proposed. The force situation of the self-balancing composite support system in the whole construction process of V-shaped pier body and 0# block are studied and analyzed by the theoretical calculation analysis and numerical simulation analysis. The relatively consistent results are achieved by the two. The calculation results and the practical engineering applications show that the self-balancing construction composite support system can balance the horizontal force during the construction process of V-shaped piers and 0 # piers better, effectively ensure the linearity of the pier body and reduce the occurrence of cracks at the pier bottom. The self-balancing composite support system has the advantages of clear force transmission mechanism, high structural system safety and low construction cost, which provides the effective guarantee for the construction quality and safety of V-shaped piers.