SWDM240B 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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