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由国家建委下达的《钻孔灌注桩施工机械选定型及施工技术措施编制》专题中的潜水工程电钻,在天津市建委的组织领导下,在交通部一航局,天津市建工局、天津建设银行和国家建委建筑科学研究院等单位的合作和努力下,已于一九七五年初试制成功三个型号(1、2、3号)的样机,并且结合天津碱厂、天津新河船厂、天津新港万吨冷库、海关大楼等工程进行了考核试验。其中1号潜水工程电钻钻了孔径600毫米,深20～226米的桩320个,累计进尺7000
Under the leadership of the Tianjin Construction Commission under the leadership of the Tianjin Construction Commission, under the leadership of the Tianjin Civil Construction Commission under the special topic of “Selected Type of Bored Pile Construction Machinery and Technical Measures for Construction Technology” issued by the State Construction Commission, Tianjin Construction Bank and the State Construction Committee Academy of Building Research and other units of the cooperation and efforts, has been successful trial in early 1975 three models (1,2,3) prototype, and combined with Tianjin soda plant, Tianjin River Shipyard, Tianjin Xingang 10,000 tons of cold storage, customs buildings and other projects were tested. One of the dive engineering drill drilled a hole diameter of 600 mm, depth of 20 to 226 meters pile 320, the cumulative footage 7000