Introduction:
The core of the Onton Self-Drilling Anchor Bolt is a hollow, thick-walled, central drilling rod with a drill bit at the top. The system is modular, meaning that the most appropriate configuration can be put together to suit on-site circumstances and the forces that apply.
The self-drilling anchor bolts are available in the steel grade S460NH and other common types. All of steel materials are produced according to EN 10210-1 and have excellent capacity to the short time simultaneously dynamic loads (torque, frequent percussion impact, bending moments) during drilling as long-term load and durability.
Working Process:
The system is used to create anchors in soft or unstable ground.Drilling, positioning and injecting are all done in one operation.
A disposable drill bit connect the drill rod. The steel hollow bar is then connected directly to the drill rig (if necessary using an injection swivel).
The cement slurry is injected simultaneously through the center hole in the anchor rod and one or two holes in the drill bit. As the drill bit moves forward, the cement slurry will spread into the formation.
When the first anchor rod is fully inserted into the bottom of the hole, stop injecting and drilling, and unscrew the anchor rod from the drilling rig.
The second bar can then be coupled to the first bar and the machine, and operation can be resumed.
Features:
Fast drilling and grouting installation
Similar installation methods for all ground conditions
Small drilling rigs without casing are used under some limited conditions.
High standards of quality control of self-drilling hollow anchors from the production stage to installation ensure the consistent quality.
High yield strength
Good impact strength
Good ductility
Excellent weldability
Our Onton Steel Drilling anchor Systems comply with the requirements of design following the US standards:
ASTM A615
ASTM F432
AASHTO M 31
FHWA-NHI-14-007(2015)
The steel self drilling hollow bar could be customized to fulfill different requirements in different areas. And we offer a full-scale stock of all necessary components such as couplings, nuts, drill bits (for various soil conditions), centralizers, and plates.
Components:
Threaded hollow bars (all lengths)
Self drilling hollow bars have a continuous external thread with R (rope) thread or T (trapezoidal) thread.
Couplers
Flexibility in length by using couples.A specially designed braking system ensures correct positioning of the connector on the rod to be connected.
Nuts and plates
Plate and nut used to create anchor head. There are straight nuts and spherical nuts, each with their appropriate plates.
Choice of drill bits for different ground conditions.
