Umbrella Arch Systems
2-Channel Ring Bit
The FATE Engineering 2-Channel Ring Bit is a durable drill bit for cuttings removal and safe pipe installation in Umbrella Arch Systems.
About the product
2-Channel Ring Bit
The 2-Groove Ring Bit is a specialized drilling bit used in Umbrella Arch Systems. Its 2-Groove structure ensures efficient disposal of debris and cuttings generated during the installation of the steel pipe umbrella arch, reducing tunnel boring time and increasing occupational safety.
Designed for various rock hardnesses and drilling rigs, these bits offer long life and high durability. They increase application efficiency by ensuring optimal energy transfer during drilling.
Applications
Installation of umbrella arch pipes in risky and weak ground
Safe handling of tunnel preloads
Pre-blasting or pre-drilling operations
Features
Easy debris removal with 2-Groove design
High wear resistance and long service life
Optimized structure for energy efficiency
Compatible with various diameters and drilling rigs
Technical data
2-Channel Ring Bit technical data.
2-GROOVE RING BIT
| THREAD TYPE | MODEL | PIPE DIAMETER | THICKNESS | CASING DIAMETER |
|---|---|---|---|---|
| R32,T38,R38,T45,T51 | 3,5'' | 89 | 4-6 mm | 102 |
| R32,T38,R38,T45,T51 | 4,5'' | 114 | 6-8 mm | 130 |
Gallery
In the same group
Umbrella Arch Systems
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Tunnel
Three-Slot Ring Bit
An annular drill bit at the front of the pipe-umbrella tube, working together with the pilot bit. While the pilot bit drills the centre of the hole, the ring bit enlarges it to the diameter needed for the tube to advance. Advancing the tube with the drilling keeps the hole open and places the tube in position, especially in loose and collapsing ground. The three-slot connection transfers rotation and impact from the pilot bit to the ring bit. Tungsten carbide buttons on the face break the ground, while flushing channels help clear the cuttings. When drilling is complete, the pilot bit is released from the connection and withdrawn through the tube; the ring bit remains in the ground with the tube.
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Tunnel
Two-Slot Pilot Bit
The centre drill bit used together with the ring bit in pipe-umbrella drilling. While drilling the centre of the hole, the pilot bit transfers rotation and impact to the ring bit through its two-slot connection. The ring bit then enlarges the hole to the diameter needed for the tube to advance, and the tube is placed as drilling proceeds. Tungsten carbide buttons on the face break the ground, while flushing channels help clear the cuttings. When drilling is complete, the pilot bit is released from the ring bit and withdrawn through the tube for reuse; the ring bit remains in the ground with the tube.
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Tunnel
Three-Slot Pilot Bit
The centre drill bit used together with the three-slot ring bit in pipe-umbrella drilling. While drilling the centre of the hole, the pilot bit transfers rotation and impact to the ring bit through its engagement faces. The ring bit enlarges the hole to the diameter needed for the tube to advance, and the umbrella tube is placed as drilling proceeds. Tungsten carbide buttons on the face break the ground, while flushing channels help clear the cuttings. When drilling is complete, the pilot bit is released from the ring bit and withdrawn through the tube for reuse.
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Tunnel
Umbrella Pipe
A steel pre-support tube installed before excavation from around the tunnel face in the direction of advance, along the crown at a slight outward angle. Installed side by side, the tubes form a protective umbrella above the section to be excavated, limiting ground movement and helping to maintain stability during excavation. Mainly used at portals, in fault zones and in weak, weathered and collapsing ground. Successive umbrellas overlap to provide continuous pre-support along the drive. With the pilot bit and ring bit system, the tube advances into the ground as drilling proceeds. When drilling is complete, the pilot bit is withdrawn; the tube and ring bit remain in the ground. Where required by the design, grout is injected through the tube and its injection holes to fill voids between the tube and the surrounding ground. Tube diameter, wall thickness, length, connection type and overlap length are selected according to ground conditions, tunnel geometry and the support design.
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Tunnel
Male / Female Coupling
Male and female couplers that join pipe-umbrella tubes end to end with a threaded connection. Tubes are added as drilling proceeds until the length specified in the design is reached. The connection transfers rotation and impact from one tube to the next during drilling and keeps the tubes on a common axis. During excavation, the joint must be as strong as the tube under the ground load it carries; coupler wall thickness and thread length are selected accordingly.