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自1979年开始,我们在10栋(33370m~2)工程冬期施工中采用了3000m~3氯化钙、氯化钠、亚硝酸钠和三乙醇胺复合外加剂负温早强混凝土爆扩灌注桩和振动灌注桩基础,取得了较好的经济技术效果,降低成本339420元。这种方法施工简便,效率高,进度快,费用低,质量好,现场文明。一、施工方法利用钻机钻透冻土层(爆扩桩钻至扩大头中心),沉桩管至持力层。灌注氯化钙复合外加剂负温早强混凝土至桩顶设计标高。按设计要求及时插入构造钢筋,保护层不小
Since 1979, we have used 3000m~3 calcium chloride, sodium chloride, sodium nitrite, and triethanolamine composite admixtures for negative temperature early-strength concrete bursting and expansion piles in winter construction of 10 buildings (333,370m~2). Vibrating cast-in-place pile foundation has achieved good economic and technical results, reducing the cost of 339,420 yuan. This method is simple, efficient, fast, low cost, good quality, on-site civilization. First, the construction method uses a drilling rig to drill through the permafrost (expansion drill pile to expand the head center), sinking piles to the holding layer. Injecting calcium chloride compound admixture negative temperature early strength concrete to the design elevation of pile top. According to the design requirements, timely insert the structural reinforcement, the protection layer is not small