现代的铁路、公路、港工、地下建筑等等多种工程的施工中,广泛采用了锚杆支护的方法。随着支护技术的发展,不断要求增大土层锚杆的抗拔能力,或者根据外界对锚杆予计拉力的数值来调整锚杆,使其最理想的适应使用状况。为了解决锚杆发展的这一重要课题,我们于1977年8月完成了机械定量扩孔锚杆及传动装置的设计。经天津市地下铁路工程公司制造、调试,并进行了试验,在一组六根长度5 Modern railway, highway, port workers, underground construction and so on a variety of construction projects, the widely used method of bolt support. With the development of support technology, it is constantly required to increase the anti-pull capacity of soil anchor rod or to adjust the anchor rod according to the value of prestressed tensile force of anchor rod to make it be the most suitable condition for use. In order to solve this important issue of bolt development, we completed the design of mechanical quantitative reaming bolt and transmission in August 1977. The Tianjin Mass Transit Railway Corporation manufacturing, commissioning, and conducted a test, a group of six length 5