在国外套管钻机(All casing boring machine)已有30多年历史,它的特点就是在成孔过程中同时以机械的手段下沉一个可以返还的(即可以重复使用的)钢质套管,成孔后,再以水下混凝土填充钻孔,同时逐步将钢质套管拔出,其工作程序如图1所示。套管施工法具有很多优点(参见“现代铁路桥梁基础、墩台施工机械及设备发展溉况”,《桥梁建设》1982年第1期),它在钻孔灌注桩的各类施工方法中是比较可靠的一种方法,因此,套管钻机在国外已得到很大发展。本文仅对套管钻机的发展现状作简要介绍,供读者 In the more than 30 years history of the All casing boring machine, it features the simultaneous mechanical sinking of a returnable (ie, reusable) steel casing during the forming process. Hole, and then filled with underwater concrete drilling, and gradually remove the steel casing, the working procedures shown in Figure 1. Casing construction method has many advantages (see “Modern railway bridge foundation, pier construction machinery and equipment development irrigation condition”, “bridge construction” 1982 the first period), it is in all kinds of construction method of bored pile is A more reliable method, therefore, casing drilling rig has been greatly developed in foreign countries. This article only briefs on the development of casing drilling rig for readers