天井掘进是当前掘进工作中最困难的一环。采用普通法掘进天井,工效低、木材消耗量大、劳动条件差、劳动强度大、安全性差和粉尘高。为了扭转这一局面,我们自2971年2月开始用深孔分段爆破法掘进天井,先后共掘进了16个天井,共计345.8米(表1)。一、工艺过程(一)炮孔布置和掏槽方式掏槽方式采用以空心孔作自由面的平行炮孔掏槽(图1)。(二)钻孔工艺钻孔设备经试验采用YQ-100A型钻机和 Paving tunneling is the most difficult part of the current tunneling. Common law tunneling, low efficiency, timber consumption, poor working conditions, labor-intensive, poor security and high dust. In order to reverse this situation, we started tunneling by deep-hole blasting in February 2971. We have dug into 16 patios totaling 345.8 meters (Table 1). First, the process (a) hole layout and cutting way Cutting way to use hollow holes for the free surface of the parallel hole cutting (Figure 1). (B) drilling technology Drilling equipment used by the test model YQ-100A and