在各级领导关怀支持下,我所同北京市住宅装配公司机械队的工人组成三结合小组,于1972年3月试制出多级钻杆灌注桩钻孔机(见图1)。一年多来,这台钻孔机在10个工程上钻孔1000多个,效果良好,深受房建单位的欢迎。 Supported by leaders at all levels of care, I formed a three-combination team with the workers of the mechanical assembly of the Beijing Residential Assembly Company. In March 1972, we produced a multi-stage drilling and grouting pile drilling machine (see Figure 1). Over the past year or so, this drilling machine has drilled more than 1,000 holes in 10 projects, which has been very effective and has been well received by the construction units.