超缓凝混凝土在钻孔咬合桩中的应用研究

Application Study on Super-retarding Concrete in Drilling Occlusive Pile

钻孔咬合桩施工技术已在地下工程围护结构中得到广泛应用且技术越来越成熟,但对于咬合桩所使用的超缓凝混凝土的相关技术研究相对较少。为确保咬合桩顺利施工,开展了针对超缓凝混凝土配合比设计、凝结时间影响因素、超缓凝混凝土咬合桩施工时间确定方法等方面的研究。研究结果表明,多种因素会造成超缓凝混凝土凝结时间产生偏差;应采取科学方法确定超缓凝混凝土的凝结时间;在超缓凝混凝土工程应用前,应进行详细交底,避免出现因对重要技术指标理解上的差异而造成工程质量问题。

Drilling occlusive pile construction technology has been widely used in underground engineering envelope Structure and the technology is more and more mature, but the research on the super-retarder concrete used in the occlu- sive pile is relatively few. In order to ensure the smooth construction of occlusive pile, the research on super-retarder concrete mix design, influence factors of setting time, determination method of construction time of super-retarder concrete occlusive pile and so on are carried out. The results of the study show that many factors may cause super-retarder con- crete setting time deviation, a scientific approach should be used to determine the setting time of super-retarder concrete, and before super-retarder concrete engineering application, the key technology should be detailed explanation to avoid causing engineering quality problems by different understandings on important indicators.