机械化衬砌混凝土板裂缝的预防及控制措施

The Prevention and Control Measures to Cracks in Concrete Slabs of the Machine Lining

随着水利工程施工技术的进步,输水渠道边坡及平原水库坝坡混凝土衬砌板施工逐渐采用机械化衬砌施工工艺;机械化衬砌施工为连续作业,其一次性成型混凝土衬砌板表面结构尺寸较大,成型衬砌板易产生裂缝。结合山东省南水北调济平干渠工程衬砌试验段施工情况,着重从地基处理、垫层料铺设、混凝土原材料质量、混凝土浇筑、成型混凝土割缝及养护几个方面分析了机械化衬砌混凝土板裂缝产生的主要原因,并针对性地提出了预防及控制措施;实践证明,通过采取积极的预防及控制措施,对减少混凝土衬砌板裂缝的产生是非常有效的。

With the development of the construction technology, mechanized construction methods are widely used in the building of the division channel and the plain reservoir. The mechanized construction is a procedure of working continuously. The one-off casting slab has too large dimension and very easy to produce cracks. Based on construction practice, the reasons of crack lies in the disposal of the foundation, the pavement of the padding, the quality of the raw material, the casting of the concrete, the cutting of the hardened concrete and the reservation of the concrete Finally several prevention and control measures are presented.