SWDM40 OPERATION & MAINTENANCE MANUAL
Double head double screw
straight auger bit
Small screw pitch, small
channel for conveying soil
slag, bucket teeth (V20, 25T,
BZ80) to enable cutter teeth
drilling into extreme soft rock
Suitable for unconsolidated
layer without water, sand layer
with much sand, small
diameter gravel layer with
poor cementation, strongly
weathered and extremely soft
rock
Double bottom and double
opening bailing bucket
It’s one of the most common
drilling tool, it’s suitable for
the construction of rotary
drilling rig with the technology
of static mud retaining wall.
High slag capacity and well
sealed. Bucket tooth type soil
has high adhesion efficiency.
The cross-cut teeth improve
the drilling ability. Its diameter
is large and equipped with
vent hole.
Suitable for layer of silt, sandy
soil, gravel. This cutter teeth
type bucket also suits for hard
layer and complex layer, such
as moderately weathered
bedrock.
Double bottom and single
opening bailing bucket
Large inlet area for slag,
especially for gravel; As single
opening, the drill teeth is
reduced, torque load is
decreased, the cutting ability is
improved. But inclination is
easy to occur.
Suitable for gravel layer with
large diameter; Slippery
mudstone, plastic soft rock; or
heaving soil which is required
to prevent the suction, sand
layer.
Single bottom and double
opening bailing bucket
Drilling resistance is small, so
as to enable drilling and
digging at high speed, but with
loose muck falling
Suitable for non-loose soft
layer, such as silty clay, clay,
plastic frozen soil, massive
sandy soil, weathered soft
rock.
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