S-2.1, r. 4 - Safety Code for the construction industry

Section 4.5.1 Disposition versions

2015-02-26

4.5.1. No drilling may be done closer than

(a)  1.5 m from a misfire or blowout. If necessary, holes may be drilled closer but not less than 600 mm on condition that drilling is performed by remote control under supervision and that all precautions are taken to ensure the safety of workers should an explosion occur at the blasting face;

(b)  8 m from any loaded blasthole or explosive loading site. Despite the foregoing, a blasthole may be drilled closer than 8 m if adaptation to specific job-sites conditions is required, particularly for trench work or work in permafrost zones in unstable conditions. The employer must then ensure that

i.  loading and drilling are performed alternately;

ii.  the shot-firer supervises and controls the drilling operations;

iii.  only cartridge explosives are used. However, if soil degradation does not allow for the insertion of cartridge explosives in the boring hole, the shot-firer may use a blasting agent to load the hole. That method may not be used for more than 3 holes per blasting;

iv.  a carpenter’s level is used to make sure that blastholes are vertical;

v.  the minimum distance from any loaded hole is 1.5 m or 20% of the hole depth to a maximum depth of 12 m, using the greater distance between the two;

vi.  if the holes have a depth of 6 m or more, the first drilling rod must be replaced by a guide tube or another means providing equivalent precision to avoid the blasting of another loaded hole in the vicinity;

vii.  loaded holes must be marked by stakes of a distinct color or carrying a distinct ribbon.

R.R.Q., 1981, c. S-2.1, r. 6, s. 4.5.1; O.C. 1959-86, s. 50; O.C. 57-2015, s. 33.

2012-09-01

4.5.1. No drilling may be done closer than:

(a)  150 mm from a bootleg or from a blowout;

(b)  1.5 m from a hole containing explosives or blasting accessories after a misfire. If necessary, holes may be drilled closer but not less than 600 mm on condition that drilling is performed by remote control under supervision and that all precautions are taken to ensure the safety of workers should an explosion occur at the blasting face;

(c)  5 m from any loaded hole or explosive loading site. If loading and drilling are performed alternately, the drilling of a blasthole may be done closer than 5 m if adaptation to specific job-sites conditions is required for trench work, or work in permafrost zones where the following requirements are met:

i.  a written notice has been forwarded to the Commission before starting the drilling closer than 5 m from any loaded hole;

ii.  a shot-firer foreman shall supervise and control the drilling operations;

iii.  only cartridge explosives are used;

iv.  a carpenter’s level is used to verify that holes are vertical;

v.  the minimum distance from any loaded hole is 1.2 m or 20% of the hole depth to a maximum depth of 12 m; the greater distance being chosen.

R.R.Q., 1981, c. S-2.1, r. 6, s. 4.5.1; O.C. 1959-86, s. 50.