| 摘要 |
The present invention relates to a method to blast underwater bedrock and, more specifically, relates to a method to blast bedrock capable of making convenient gunpowder charging work by charging a lowest part of a gunpowder hole with a gel type bulk emulsion explosive through an automatic explosive injecting device when blasting underwater bedrock in a semi-ground state, while enhancing economic feasibility and an efficiency of blasting the bedrock by automatically discharging foreign substances upwards from the gunpowder hole. The method to blast underwater bedrock is capable of blasting bedrock in a semi-ground state using an automatic explosive injecting device (20) installed in an explosive injecting vehicle (10), including a hose (240) injecting an explosive into a gunpowder hole (100). The method comprises: (S10) a step of blasting a large bedrock, exposed above the sea surface to excavate the bedrock up to a predetermined height above the sea surface; (S20) a step of forming a plurality of gunpowder holes (100) on the bedrock, excavated up to the predetermined height above the sea surface, in a ground state; (S30) a step of inserting a hose (200) of the automatic explosive injecting device (20) and a detonator (120) into the gunpowder holes (100), but inserting the hose (200) into the lowest part of the gunpowder holes (100); (S40) a step of discharging a bulk emulsion explosive (110) from the hose (200) to fill a lowest part of the gunpowder holes (100) with the bulk emulsion explosive (110); (S50) a step of filling an upper part of the gunpowder holes (100) with a filler (130); and (S60) a step of igniting a detonator (120) loaded in the gunpowder holes (100). |
