1.Које врсте бушаћих шипки се користе у бушењу са језгром?
ü Aluminium alloy drill rods
ü Seamless Steel drill rods
ü Wire-line drill rods (welded pipes)
2. Које су сврхе цеви за кућиште?
ü To penetrate and stabilize the overburden
üTo stabilize non-stable formations with a tendency to cave in
3. Зашто увек треба да користите кључеве са пуним захватом када радите на пример са унутрашњим цевима и кућиштима за подизање језгра?
ü It is important to use the right type of rod wrench. So called universal rod tongs should be avoided especially when it comes to breaking or tightening the thread of an inner tube or any other thin walled piping. Universal tongs can easily destroy thin walled piping. For these pipes only so called full grip wrenches should be used.
4. Које врсте алата за пецање увек треба да буду доступне на месту бушења?
ü No matter how careful the driller and the helper are, sooner or later they will
ü accidently drop a tool down the drill hole. Drill pipes can also break in the hole.
ü These items must be removed before the drilling can continue. Normally, according to the hole size of the projects, we should prepare 1 or 2 sets of NWL(NQ), HWL(HQ), PWL(PQ) sizes of rod recovery rod at the site.
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