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一般说来,灌注桩同预制桩相比,可节约钢材和木材;同深埋天然地基基础相比,可减少土方,节省劳力.总之,沉管式灌注桩具有设备简单、施工方便、工期短、桩长控制自由、成本低等特点,已被广泛应用到一般的工业与用民建筑中去.但由于影响沉管式砼灌注桩的成桩质量因素很多,如拔管太快,管内砼压力不足,砼不符合要求,桩管进泥水严重,造成缩颈、断桩、悬桩、桩体峰窝等质量事故.为了保证沉管灌注桩的质量,我市普遍采用跑桩法来检验灌注桩的质量,弥补缺陷.
In general, cast-in-place piles can save steel and wood compared to prefabricated piles. Compared with deep-buried natural foundations, they can reduce earthwork and save labor. In short, immersed tube cast-in-place piles have the advantages of simple equipment, convenient construction, and short construction period. The characteristics of free length control and low cost of piles have been widely applied to general industrial and civil buildings. However, due to the large number of factors affecting the quality of the piles of cast-in-place cast-in-place concrete piles, such as extubating pipes too quickly Insufficient pressure, defects do not meet the requirements, pile pipe into the mud is serious, resulting in necking, broken piles, suspended piles, piles and other quality accidents. In order to ensure the quality of immersed pipe cast-in-place piles, the city commonly used to run the pile method to test The quality of the pile, make up for the defect.