苏通大桥贫胶砂石料路基裂缝控制措施

Crack Control Method of Poor Adhesive Sand-gravel Subgrade in Sutong Bridge

以苏通大桥路面工程为例,分析贫胶砂石料路基裂缝产生的原因,包括干缩和温缩两个方面。介绍贫胶砂石料基层施工过程中骨料级配、水泥用量、含水量、混合料配合比以及密实度、高程和厚度、平整度、均匀性等技术指标的控制方法。指定实际施工中水泥用量应比设计值增加5%等技术措施,严格遵循施工组织要求,减少裂缝产生。检测结果表明,贫胶砂石料基层裂缝少,无明显表面缺陷。

Taking the pavement of Sutong Bridge for example, the crack causes of poor adhesive sand-gravel subgrade are analyzed, including dry shrinkage and temperature shrinkage. The control methods of aggregate gradation, cement and water amount, mixture mix proportion are introduced during construction, as well as the technology indexes of density, elevation and thickness, smoothness and uniformity. It is indicated that the cement amount should be 5% higher than design value, and so on to reduce cracks. According to these methods, the detection results of poor adhesive sand- gravel subgrade show that there are few cracks and no obvious surface defects.