Blasting Safety Procedures : Minimum Steps to be taken for the Test Shots

November 21, 2009

Following are the minimum steps to be taken for the test shots:

A tailgate safety meeting will be conducted by the Contractor regarding handling and use of explosives and the safety rules listed above. Each person that intends to attend the test shots shall attend this safety meeting.
Erect Blast Warning signs.
Set up lightning detectors.
The test pattern will be drilled according to that proposed by Contractor.
Each drilled hole will be accurately measured for location and depth.
Each hole loaded according to the attached sketch and the loading logged on the Test Shot form.
Stemming quantities will be entered on Test Shot Form.
Seismic measurement instruments will be set up to measure at a minimum of three locations: each end of the test and the test midpoint (the monitors will be positioned on all nearby structures). If the nearby structure is buried, the structure will be excavated and the monitor set on the structure.
Distances will be measured to all nearby structures.
Give the warning and blast signals.
Detonate the test shots.
After the blaster has checked for misfires and given the all clear signal, all involved personnel will check existing structures, fissures and ground cracks in all directions from the test shot.
Check readings on seismic monitors and record readings on the Test Shot Form.
Dig the test shot rock for satisfactory breakage and log the results on the Test Shot Form.
The Contractor’s Consultant or Engineer will recommend changes to be made in the variables for the next test shot. These recommendations will be based primarily on the findings in 12, 13, and 14 above along with his expertise in blasting near foreign structures.

Written by admin · Filed Under Civil

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