大直径冲孔灌注桩钢筋保护层影响因素分析

Influential factors of steel bar concrete cover in large-diameter bored pile

结合大直径冲孔灌注桩实例,分析冲孔灌注桩钢筋混凝土保护层的主要影响因素——钢筋净距与粗骨料粒径、泥浆密度与泥皮厚度、混凝土坍落度与桩孔直径、混凝土冲量与导管埋深、保护层设计厚度与施工偏差,并提出预防措施,为类似灌注桩工程提供参考。

Combining with a large-diameter bored pile example, this article analyzes the main influential factors of the R. C. concrete cover in cast-in-situ pile, i. e. steel bar spacing and coarse aggregate size, slurry density and thickness of mud cake, concrete slump and the pile hole diameter, concrete impulse and tremie pipe depth, thickness of concrete cover design and construction errors, and puts forward prevention measures, to provide reference for similar bored pile engineering.