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七十年代初以来,常规的沉管灌注桩由于它具有长度灵活、可适应不同地质条件、材料省、造价低、施工进度快等优点,在浙江各地得到了广泛应用。随着基本建设的发展,近几年应用数量更急剧上升,全省每年达到20余万根之多。但是常规的沉管灌注桩,其承载力不高,而且施工中有时会发生拔管困难、桩身缩颈等情况,致使设计人员不得不考虑改用其他较昂贵的基础方案。为了提高沉管灌注桩的承载力,我们从当地的地质条件和施工机械设备条件出发,
Since the early 1970s, conventional immersed cast-in-place bored piles have been widely used in various parts of Zhejiang because of their advantages of flexible length, adaptability to different geological conditions, material saving, low construction cost, and quick construction progress. With the development of capital construction, the number of applications has risen sharply in recent years, and the province has reached more than 200,000 roots each year. However, the conventional immersed tube cast-in-place piles have low bearing capacity, and sometimes difficulties in extubation and necking of the piles occur in the construction, so that designers have to consider other relatively expensive basic schemes. In order to improve the bearing capacity of immersed tube cast-in-place piles, we proceed from the local geological conditions and construction equipment conditions.