高速公路加宽建设已经成为现阶段对老路升级改造的主要技术手段,且桥梁加宽成为关键问题。新老混凝土在浇注后的连接性和实用性,引起广泛关注。本文根据桥梁的实际情况和地质条件,介绍了3种不同的混凝土连接方式,简述了梁格法在分析结构内力时的基本理论,并结合混凝土的材料特性阐述了其收缩徐变现象和连接特性。 Widening the expressway construction has become the main technical means of upgrading and reconstructing the old road at this stage, and widening the bridge has become a key issue. New and old concrete pouring connectivity and practicality, aroused widespread concern. Based on the actual conditions and geological conditions of the bridge, this paper introduces three different concrete connections, briefly describes the basic theory of the beam-grid method in analyzing the internal forces of the structure, and expounds the shrinkage and creep phenomena and the connection characteristics of the concrete with the material properties.