SWDM40 OPERATION & MAINTENANCE MANUAL
level. Guard barrel diameter should be bigger 20cm than pile diameter
2) Normally use stabilizing liquid(mainly composed of bentonite) to prevent hole wall from
collapse.
3) Bucket operation is the same as short auger drilling，except discharging soil, lifting bit to
Rotary drive lower baffle plate, strike lower baffle plate to open rotary bucket base cover, soil
discharge by swing emergency stop.
Special Note ： Generally, it is better do not use winch emergency stop to vibrate and
unload soil, which will badly effect winch and steel rope service life, even lead to rope
break and accident occur.
4) Put down the drilling bucket on the ground quickly after dumping, enable the drilling bucket
bottom plate closed by opening mechanism reacted.
5) Repeat above procedure until reach to the design depth or the bit should be changed.
Attention：
It may use stabilizing liquid instead of guard barrel when drilling in normal soil layer.
Prepare some stabilizing liquid for drilling hole, the ratio according to soil condition, N
value, drilling dia. and water level and so on.
Confirm water level condition, testing piles.
Remove slurry and stabilizing liquid mixture in hole bottom after hole drilling.
When drill in the layer without underground water, it can be compacted by hammer or
fill cement and mix it with hole bottom less settlement.
When lower Kelly bar, pay attention to the corresponding relation of falling depth and
each section Kelly bar extension order to prevent “rod lock”, “rod wobbling” and “rod
cracking”.
Before lifting Kelly bar, anti-clockwise rotate Rotary drive to delete occlusion because of
torque transferring. During kelly bar hoisting, check corresponding relation of lifting
depth and each section Kelly bar retraction order to prevent “rod lock”, “rod cracking”.
5.5.4.3 Core Drill
1) Drilling procedure is as the same as short auger.
2) Pay attention to drilling speed and pressure; keep kelly bar from jumping up and down.
3) Slow down drilling with low pressure before core barrel enters rock; increase speed and
pressure when core barrel enters rock layer.
5.5.5 Machine Transposition
After drilling one hole, it needs to move machine to next ready pile hole. It should check the
ground status between two holes to prevent mushy road, collapse and cross tilt angle over 5°
ground. After moving, repeat above mention drilling procedure.
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