Patent ID: 11920472
Assignee: ANHUI CHINA RAILWAY ENGINEERING TECHNOLOGY SERVICE CO., LTD
Field: Other special machines (Mechanical engineering)
Classification: CPC E  F | IPC E

Claim 7:
8. The millisecond time control method for excavation blasting of a tunnel as claimed in claim 7, wherein in a situation that the segmented millisecond blasting technology is adopted, an interval charging manner is used for a blast hole, an explosive is divided into two sections for charging with the two-section explosives having a same length, the two-section explosives are delay-blasted by a digital electronic detonator in different time periods, and a blasting time of a lower section of the two sections is delayed by 5-10 milliseconds (ms) compared to an upper section of the two sections; and
wherein in a situation that the continuous charge millisecond blasting technology is adopted, a diameter of the explosive is smaller than a diameter of the blast hole, a gap is defined between the explosive and a wall of the blast hole, the explosive is continuously loaded into the blast hole and is not separated, and the explosive is delay-blasted by the digital electronic detonator.