为了改进天井掘进工艺,寻找新的天井开掘方法,我矿五连党支部,组织以老工人为主体的“三结合”试验小组,在中南矿冶学院和湖南冶金研究所的协助下,对深孔分段爆破掘进天井进行了试验。一年多来用深孔分段爆破法共掘进了七个天井,其中五个垂直的,二个倾斜的,总长184米。 In order to improve the tunneling technology and to find a new method of digging out the patio, the coal mine party branch with five branches of mine organized a “triple combination” experimental group with old workers as the main body. With the help of Zhongnan Mining and Metallurgical Institute and Hunan Metallurgical Research Institute, Hole blasting excavation of the shaft was tested. In the past year, a total of seven pavilions were excavated using the deep-hole blasting method, of which five were vertical and two were inclined with a total length of 184 meters.