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近年来,随着城市建设的发展,建筑物愈来愈高,荷载大且集中,从要求提高单桩承载力并降低建设费用、缩短工期出发,在日本大多采用现场扩底灌注桩。其桩身及底部的扩大机具、检测装置等均较先进,对我国的桩基研究,有一定借鉴作用,现介绍其中两种,供参考。一、OJP施工法 OJP开发于1970年,是现场扩底灌注桩的十三种施工工艺中最早采用的一种,最先取得日本建筑中心的鉴定,已应用于许多建筑工程中。它是利用贝诺托钻机进行桩身成孔,用特制的机具将桩端扩大成圆锥形以增加承载能力的一种现场扩底灌
In recent years, with the development of urban construction, buildings are getting higher and higher, and the loads are large and concentrated. Starting from the requirement of increasing the bearing capacity of single piles, reducing the construction cost, and shortening the construction period, most of the sites in Japan are used to expand the bottom of piles. The piles and the bottom of the expansion of equipment, testing equipment, etc. are more advanced, for our country’s pile base research, there is a certain reference function, are introduced two of them for reference. I. OJP Construction Method OJP was developed in 1970 and was the earliest one of the thirteen types of construction techniques used for site-expanded cast-in-place piles. It was first recognized by the Japanese Architecture Center and has been used in many construction projects. It is the use of Benoto drilling machine for hole forming, using special equipment to expand the end of the cone into a conical shape to increase the bearing capacity of a kind of on-site expansion of the bottom irrigation