由于变截面连续箱梁本身存在一定的径向预应力,加上施工过程中波纹管定位存在偏差、定位不牢固引起的偏位以及拉筋布置不够准确等,在预应力施加过程中造成局部径向应力偏大从而引起混凝土崩裂现象时有发生。本文主要就施工预防措施和混凝土崩裂修复技术作一简单介绍,以供同类工程借鉴。 Due to the existence of certain radial prestress in the continuous box girder of variable cross section, as well as the deviation of the positioning of the corrugated pipe in the construction process, the misalignment caused by the unfastened positioning and the inaccurate arrangement of the tensile reinforcement, the local diameter is caused during the prestressing process To the stress is too large to cause concrete cracking phenomenon have occurred. This article mainly gives a brief introduction of construction precaution and concrete crack repair technology for reference of similar projects.