Anchoring is widely used in tunnel for pre-support, slope, coast, mine, water conservancy projects, Building foundation, roadbed reinforcement and geological faulty treatment such as landslip, crack, and sink age, it’s irreplaceable in narrow construction environment.
Anchoring is widely used in tunnel for pre-support, slope, coast, mine, water conservancy projects, Building foundation, roadbed reinforcement and geological faulty treatment such as landslip, crack, and sink age, it’s irreplaceable in narrow construction environment.
Core Advantages
Self Drilling Hollow Bar Anchor System
Comprised of a hollow threaded bar attached with a drill bit that performs drilling. The hollow bar allows air and water to freely pass through the bar during drilling to remove debris. After drilling at the required depth is completed, grout fills the hollow bar through the pressure and completely covers the entire bolt.
Coupler
The coupler can be used to join hollow bars and extend the bolt length, meaning the anchor can be elongated efficiently with the couplers to reach specific design depths.
Plate, Nut & Drill Bit
The plate and nut are installed according to design requirements. Drill bits are carefully selected based on specific ground conditions to ensure optimal penetration and stability.
Technical Specifications
Hollow Anchor Bar
Size
Outer Dia.
Inner Dia.
Ultimate Load
Yield Load
Weight
(mm)
(mm)
(kN)
(kN)
(Kg/m)
S-T52/24
52
24
929
730
10.2
S-T52/26
52
26
929
730
9.7
Coupler
Size
Outer Dia.
Length
Weight
Note
(mm)
(mm)
(Kg/pc)
S-T52
70
160
2.31
With sealing structure
E-T52
70
160
2.46
Without sealing structure
Hex Nut
Size
Key Size
Length
Weight
Hardness
(mm)
(mm)
(Kg/pc)
(HRC)
S-T52
80
70
1.94
25-30
Spherical Collar Nut
Size
Dimensions
Thickness
Hole Dia.
Weight
(mm)
(mm)
(mm)
(Kg/pc)
S-T52
80
70
2.3
290-340
Anchor Plate
Size
Dimensions
Thickness
Hole Dia.
Weight
(mm)
(mm)
(mm)
(Kg/pc)
SST52
145×145
27
65
3.6
200×200
30
65
8.59
220×220
35
65
13.1
Frequently Asked Questions
What is a Self-Drilling Hollow Bar Anchor System?
It is an advanced anchoring solution featuring a hollow threaded bar that acts as both the drill rod and the anchor bolt. It allows for simultaneous drilling and grouting, which is highly efficient in loose or unstable ground conditions.
Where are these anchor bars typically used?
They are widely utilized in tunnel pre-support, slope stabilization, mining operations, roadbed reinforcement, and treating geological faults such as landslips or cracks.
Can the length of the hollow anchor bar be extended?
Yes, by using specialized couplers, multiple hollow bars can be joined together to reach the required depth according to the project design.
How does the grouting process work with hollow bars?
After drilling to the desired depth, grout is pumped through the hollow center of the bar. The grout fills the anchor and the surrounding borehole from the bottom up, ensuring complete coverage and bonding.
What factors determine the choice of drill bit?
The choice of drill bit depends entirely on the ground conditions, such as soil type, rock hardness, and the presence of groundwater, to ensure efficient penetration.
What are the components of a complete anchor system?
A standard system includes the hollow threaded bar, a sacrificial drill bit, couplers for extension, an anchor plate, and a hex or spherical nut for tensioning and securing.
KAT DRILLING
