SUNWARD SWDM240B - Drilling Tools; Common Drilling Tools and Application

SWDM240B OPERATION & MAINTENANCE MANUAL
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8.2 DRILLING TOOLS
8.2.1 Common Drilling Tools and Application
Type of Drill Bit
Features
Suitable layer
Cone single head single
auger bit
Cone teeth drill
successively, that reduce
load greatly; Cone auger
pilot drilling prevent or
reduce the possibility of
inclined hole; big screw
pitch distance, strong
capacity for conveying
soil slag, but small
intensity; low performance
Gravel-cobble layer,
gravelly soil, especially for
the layer with much and
big gravel-cobble and a
weathered rock formation
with joint fissures
Cone double head dual
auger bit
During drilling, dual teeth
work simultaneously, thus
high efficiency and stable
drilling; Cone structure for
good guide performance;
Small screw pitch
distance, conveying
channel for soil slag is
small but with high
intensity, and good
performance in guiding
and carrying rock.
Suitable for drilling under
big pressure, used for
intermediary weathered
sandstone and slightly
weathered bed rock, and
gravel ground with small
particle size
Type of Drill Bit
Features
Suitable layer
Small screw pitch in the front
part, high intensity; the screw
pitch is double in the rear part,
the conveying channel for
soil slag increase.
Suitable for all kinds of
bedrock, pebble layers with
medium size
Big screw pitch, large soil slag
conveying channel, but small
intensity, bucket teeth (V20,
25T, BZ80)
Suitable for frozen soil without
water, cohesive soil, sand
layer, gravel layer with partial
cementation difference
medium particle size