SELF-DRILLING ANCHORS
SELF-DRILLING ANCHORS
A self-drilling anchor is a type of bolt used to ensure the stability of the roof and walls in underground mining and tunnel construction. Unlike other types of bolts, self-drilling bolts do not require pre-drilling and can drill and hold at the same time.
These bolts are designed with a hollow threaded bar with a one-time use drill bit at its end, simplifying and reducing the installation process.
Once installed, they are filled with resin or cement mortar to consolidate the ground. In addition, these bolts can be joined by couplings to achieve lengths that would be impossible with other types of bolts.
At the end of the bolt, there is a nut that, once installed, is tightened, putting the bearing plate and the bolt itself under load, further increasing the bolt’s effectiveness.
Self-drilling anchors can also be used in areas where the rock is harder or more compact, using different types of bits. By drilling and securing at the same time, the need for additional equipment for pre-drilling is reduced, which also reduces cost and installation time.
ADVANTANJES OF ITS USE
Drilled and installed in one go
Consolidation of unstable or low-consistency terrain through injection
Lengths of over 15m can be reached thanks to couplings
Rapid stabilization and high load capacity
FIELDS OF APPLICATION
Rock support
Anchoring systems
Soil and gallery fortification
SELF DRILLING ANCHORS COMPONENTS
THREADED BAR
EXTENSION/CONNECTION COUPLING (s)
SINGLE USE DRILL BIT
HEXAGONAL NUTS
TYPE R
The R type self-drilling bolt has excellent internal and external quality control. The R-wire is in accordance with ISO10208, ISO 1820 (R51) and the internal hollow of the bars guarantees compliance with EN14199/EN14490/ASTMF432/ASTM A615 standards.
Custom fabrication is available upon request as are galvanized or matched coated components.
TYPE T
The T-type self-drilling bolt also has excellent in-house quality control. The T-wire features a longer pitch, as well as a greater profile angle, all in accordance with manufacturing standards.
The internal hollow of the bars guarantees compliance with the EN14199/EN14490/ASTMF432/ASTM A615 standards.