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Full-Slewing All Casing Construction Method
(CD Method)
The full slewing all casing method (CD method) uses a cutter bit with cemented carbide tip attached at the cutting edge of the casing tip and rotates it from the full slewing excavating machine to isolate underground obstacles in order to remove sand, soil, and obstacles in the casing tube using the hammer grab. It is mainly used for existing underground frames (beams, columns, batholiths, and foundation piles).
While having fewer effects on the surrounding ground, obstacles in the casing can be completely removed. After removal, the ground is backfilled by generated soil, sand, broken stone, and mortar,. In recent years, this method is commonly adopted for preliminary work for SMW Construction Method or cast-in-place pile.
Characteristics
- High-torque turning force realizes excavation of rock ground, bounding stone, and cobbled stone, as well as cutting of reinforced concrete.
- It has fewer effects on the surrounding ground because the casing tube protects the drilled holes while excavation progresses inside the ground.
- The cobbled stone and obstacles inside the casing tube can be completely removed by the hammer grab.
- Suitable for drilling at a large diameter and of a great depth.
- Casing drilling realizes high verticality thanks to its rigidity. It demonstrates superior performance in friction cuts as it rotates the entire circumference.
Example of Construction Work and Facility
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