SUNWARD SWDM240B - Page 221

SWDM240B OPERATION & MAINTENANCE MANUAL
220
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.