预应力混凝土箱梁桥底板裂缝成因分析

Cause Analysis of Bursting Cracks in Bottom Slab of Prestressed Concrete Box-girder Bridge

根据预应力混凝土连续箱梁桥的设计与施工特点,分别从底板预应力束线形、底板预应力束布置位置、温度应力的影响、钢筋的疏密程度以及混凝土的浇注质量与顺序等方面分析了该类桥型底板容易崩裂的原因,并提出了相关的防裂措施。

In this paper,based on the characters of continuous prestressed concrete box-girder bridges in the work of design and construction, the reasons of cracks in the bottom slab occurring with highprobability are expounded from many sides such as the alignment of prestressing tendons in the bottom slab, the transverse position of prestressing tendons in the bottom slab, the temperature effect,the spacing between reinforced bars as well as the quality and order of concrete placing. In the end, some countermeasures of preventing this kind of cracks are proposed.