The concentric drill bit consists of three parts: the center guide drill bit, the pipe shoe and the centering ring drill
bit. The center guide drill bit is used to drill the center of the hole and pull the drill string, and together with the
disposable centering ring drill bit, it forms a complete drilling drill bit. The pipe shoe is connected to a casing by
welding or threading, and is pulled into the hole with the impact of the hammer and the center guide drill bit. The
centering ring drill bit and the pipe shoe are combined and locked to the tail handle of the hammer by the center
guide drill bit. During drilling, the ring drill bit drills out the part of the casing that exceeds the outer diameter of
the center guide drill bit required for the casing to enter the hole. The shoulder of the guide drill bit supports the
shoulder of the pipe shoe. The impact energy of the down-the-hole impactor is transmitted and broken through
the guide drill bit and the ring drill bit, and part of the impact energy is used to push the casing forward. After
drilling and hole guarding are completed, the center guide drill bit and the drill string are retrieved by gently
reversing the buckle connection to unlock it. The ring drill bit remains in the hole and is only removed together
when the casing is pulled out. Our concentric follow-up drilling tools are designed for use in loose rock formations.
They can drill holes of various sizes and can be used for drilling and protecting holes simultaneously. The dust
removal groove is built into the casing and the pipe shoe to ensure good sealing at the bottom of the hole,
minimizing the possibility of blockage caused by scattered objects around the hole. This drilling tool makes it
easy to follow the casing, simplifies the equipment, and is easy to operate. It is suitable for many purposes,
such as micropiling, pillars, anchoring, beach construction and horizontal drilling. Except for odex bit, we also
supply other rock drilling tools, such as DTH drilling tool, thread button bit, taper button bit, shank adapter,
MF rod, extension rod, air leg rock drill, drill rods etc, welcome to contact us if you need any of them.
