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1964年以来,我们在坑内钻探中,采用了无塔作业,在十一个钻孔施工中,证明效果良好,它不仅在施工钻室方面节约了时间,而且简化了安装,节省了人力物力。
Since 1964, we have used a tower-free operation in drilling pits. In the construction of 11 boreholes, it proved to be effective. It not only saves time in the construction of drilling rooms, but also simplifies installation and saves manpower and material resources.