SANY SR400R - Underreamer Bit; Casing Drive Adapter

Safety, Operation and Maintenance Manual-September 30, 2019
4-139
4.7.3.6 Underreamer bit
Fig.4-204 Underreamer bit
Table 4–11 Underreamer bit parameter
Size
D1 (mm) D2 (mm)
800 1600
1000 2000
1200 2000
1800 3000
In the same layer, enlarging pile tip base area
can greatly increase pile load-bearing ca-
pacity without increasing the hole diameter. In
general, underreamer bit accompanied with
rotary drilling rig includes soil underreamer bit,
which is suitable for drilling common soil and
equipped with round chisels made of alloy
block or alloy drill head, and rock under-
reamer bit, which is suitable for drilling hard
bed rock and hard frost soil and equipped with
cutting tool made of round chisels.
4.7.3.7 Casing drive adapter
Fig.4-205 Casing Driver
Casing drive adapter connects rotary drive
and casing. During operation, rotary drive
transfers torque to casing to make it rotate. At
the same time, rotary drilling rig crowding de-
vice presses rotary drive down and transfers
force through rotary drive to casing to push it
down into ground.
D2
D1
SR400R Rotary Drilling Rig
Operation
mengkf 2022-04-21 mengkf 2022-04-21 mengkf 2022-04-21
mengkf 2022-04-21 mengkf 2022-04-21 mengkf 2022-04-21
mengkf 2022-04-21 mengkf 2022-04-21 mengkf 2022-04-21
mengkf 2022-04-21 mengkf 2022-04-21 mengkf 2022-04-21