前言近年来,随着钢管桩制造技术的改进和建筑物设计施工水平的提高,钢管桩基础也相应得到迅速发展。目前,日本每年的钢管桩用量约达100万顿。过去使用的钢管桩,一般多为开口桩。但随着桩径的不断加大,桩尖闭塞的程度就成了一个大问题。本文即根据700毫米以 Foreword In recent years, with the improvement of steel pipe pile manufacturing technology and the improvement of the design and construction of buildings, the steel pipe pile foundation has been developed rapidly accordingly. At present, the annual steel pipe pile usage in Japan is about 1 million tons. Steel pipe piles used in the past are mostly open piles. However, with the increasing pile diameter, the degree of pile tip blocking has become a big problem. This article is based on 700 mm