•Description: The Xs GT system is especially designed for piling, micro piling, anchor installation and other civil engineering applications, when casing needs to be retrieve from the ground. Overburden can be cased and sub-casing anchor sockets drilled in the bedrock in one operation, with the same driver-bit, without removing the drill string. The driver as four (4) recesses portion which transfers impact directly to the crown, giving the necessary force to drill and drive down casing. The drilling end of the driver bit is slightly bigger than the core itself, to provide clearance when drilling in bedrock.
Advantages using Xs GT over other systems Advantages over other systems
Driver bit: The driver bit is the device that transfers impact and rotation to the crown bit for drilling. The driver bit locks into four flats on the casing crown and they act together as a standard drill bit, both the driver bit and the crown have tungsten carbide buttons. The Driver bit drills a pilot hole of 3" below the crown to guide the direction of the casing in rough drilling. Afterwards the same driver bit can be used for sub-casing drilling.
Crown bit: The crown bit is a two-piece unit permanently connected together. The upper part is welded to the casing, and the lower part, which has Tungsten Carbide is free to rotate with the driver bit.
•Impact zone: Direct energy from the hammer is transferred to the crown bit through two (4) recesses formed by the locking surface.
•Evacuation: Two (2) big air holes are drilled in the face of the bit (drilling end). Those holes are directly connected to two (2) large flushing air ways, placed at 180 degree between each other; these flushing grooves transfer the drill debris from the drilling end of the driver up to the hammer zone. To help keeping a good flow of debris, two (2) other smaller air holes in the flushing air ways, help give the cuttings some velocity.
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