日本竹芝埠头再开发的第一期工程是在东京湾一个旧港口设施拆除的基础上,建造以两幢26层高99.8m建筑物为中心的新港湾设施。当初规划的时候,推测旧基础下是6m深的灌注桩,拟把这些旧桩拆除后重新打钢管壁现浇钢筋混凝土桩,桩径φ1500～φ3000、深度35m,总数为195根,其中φ2400以上大口径桩130根,占三分之二。但是在施工前实地调查的时候却发现旧基础下不是6m长的灌注桩,而是多达400根,深为26m(13m+13m)的预制桩,所以拆除这些预制桩的方法就成了大问题 The first phase of the redevelopment of Takeshiba, Japan, was based on the dismantling of an old port facility in Tokyo Bay and the construction of a new harbor facility centered on two 26-storey 99.8m buildings. At the time of planning, it was speculated that the old foundation was a 6-m deep cast-in-place pile. After removing these old piles, the in-situ cast-in-place reinforced concrete piles were replayed. The pile diameter was φ1500 to φ3000 and the depth was 35m. The total number was 195, of which more than φ2400. 130 large-diameter piles, accounting for two-thirds. However, during the field survey before construction, it was discovered that the old foundation was not a 6-m long cast-in-place pile, but as many as 400 prefabricated piles with a depth of 26m (13m+13m), so the method of dismantling these prefabricated piles became large. problem