SUNWARD SWDM40 - Page 151

SWDM40 OPERATION & MAINTENANCE MANUAL
150
Type of Drill Bit
Features
Suitable layer
Mechanical bottom reaming
bit
The open mechanism is a four link
rod, which includes expansion arm
and link rod. A bearing bottom plate
is installed on the bottom of drill bit,
of which two reamed blade spread
out symmetrically to expand bottom
pile of different diameters. It mainly
includes two types: upper open and
lower open; Simple structure, easy
operation and maintenance. It can be
installed with normal alloy bit tool,
cutter teeth, cone and hob.
Soil layer, highly
weathered layer,
moderately weathered
layer and hard bedrock
Hydraulic bottom reaming bit
Hydraulic cylinder controls the
extension and retraction of reamed
blade, it should be retracted
downward when work. Hydraulic
power station and pipe reeling
equipment should be placed on the
ground. But the ability to expand is
very strong. The reamed pile wall
has high intensity, not easy to
collapse; meanwhile, it can be
reamed at any position of the pile
hole. It also can take the construction
for bamboo pile.
Soil layer, highly
weathered layer,
moderately weathered
layer and hard bedrock
Type of Drill Bit
Features
Suitable layer
Hole cleaning bit
Welding continuous type,
detachable scraper
Remove sediment from the bottom of
the hole
Open bucket
Semiclosed type, cutting tool
is cutter tooth or bucket tooth.
Suitable for layer with large viscosity,
such as pure clay, old clay and silt.
The work efficiency is not quicker
than bucket tooth semiclosed, but its
application is wider, such as high work
efficiency for pebble bed.