Hebei Tianlong Fasteners Co., Ltd

language

Get free product quotes

Fill in your phone and email information, and we will contact you promptly within one business day to resolve the issue you raised as soon as possible.

Home

Self-Drilling Anchor Bolt

The anchor rod body acts as the drill pipe and rotates under the drive of the drilling machine.

Category:

Rock Bolt

Email:

liudong@tl-fastener.com

Email:

bolt@tl-fastener.com

Get Quote

Also Like

Share to

产品描述

Product Introduction

Self-Drilling Anchor Bolt is an efficient geotechnical anchoring component that integrates the functions of drilling, grouting and anchoring. It does not require pre-drilling and is particularly suitable for complex geological conditions that are fragmented, loose and prone to collapse.

Core structure composition

Hollow Bar

Material: High-strength alloy steel (such as Q345B, 45# steel), with a yield strength typically ≥ 600MPa.
Structure: Centrally hollow, with a continuous full thread (R type or T type) on the outer wall. The thread not only facilitates extension but also enhances the grip force with the grouting material.

Drill Bit

Material: High-speed steel (tungsten steel), highly wear-resistant and hard.
Types: Cross-shaped, ball tooth-shaped, wedge tooth-shaped, etc., suitable for different geological conditions such as soft rock, hard rock, and soil layers.

Coupler

Used for connecting multiple rods to achieve seamless extension and enable deep drilling to any depth.
The internal threads precisely match the rods, ensuring coaxiality and connection strength.

Plate

Square / circular steel plates, which distribute the nut pressure and protect the rock and soil at the opening.

Nut

Apply prestress through the threaded connection to fix the structure and the base plate.

Working principle

Drilling
Under the rotational and impact force of the drilling machine, the anchor rods are cut and crushed by the drill bit to break the rock and soil.
High-pressure air / water is ejected through the drill bit hole from the hollow inner cavity, flushing the rock debris in the opposite direction, without the need for casing for wall protection.
Grouting
After drilling to the designed depth, there is no need to pull out the drill rod; instead, pressure grouting is directly carried out through the hollow rod body.
The grout (cement slurry / cement mortar) flows out from the drill bit and fills the channels and fractures, covering the entire rod body.
Fixation
After the grout solidifies, the rod body forms an integral force-bearing body with the rock and soil, providing adhesive anchoring force.
Installing pads and nuts, prestress can be applied to provide end-bearing anchoring force.

Specifications

Material	Steel
Function	Rock and Soil Anchoring
Scope of Application	Foundation and base engineering, slope engineering, tunnels and underground engineering
Diameter	Mainstream models R25N, R32N, R38N, R51N; Large models up to T73, T103, T130.
Standard length	1m, 2m, 3m, 4m (can be extended to several tens of meters
Tensile strength	Approximately 200kN ~ 14,000kN (varies with diameter / material

Core advantage

High construction efficiency
One-step solution: Drilling, grouting, and anchoring are all completed in one process, reducing the number of procedures by 50%.
No need for casing: Saves materials and time, and is less prone to collapse.
Fewer workers required: 2-3 people can operate it.
Extremely strong geological adaptability
Perfect fit: Fault fracture zones, quicksand, silt, pebbles, strongly weathered rocks, and backfill soil.
Traditional anchor rods often collapse, get stuck, or fail to form holes in such strata.
Reliable anchoring quality
Pressure grouting is full: Effectively fills cracks, forming a composite reinforcement ring.
Full length bonding: No stress concentration, excellent seismic, uplift, and uplift resistance performance.
Length is not limited
The connection sleeve can be infinitely extended, reaching a maximum depth of hundreds of meters.

Main application fields

Tunnels and underground engineering: Advance pipe stenting, radial support, collapse emergency rescue.
Slopes and foundation pits: Rockfall reinforcement, landslide control, soil nail walls, anti-floating anchors.
Mining engineering: Roof and side wall support of tunnels.
Foundation reinforcement: Transmission towers, wind power towers, bridge piers and abutments, building reinforcement.
Water conservancy projects: Dams, cofferdams, anti-seepage walls and anchors.

Standard construction process

◆ Preparation: Drilling rig, anchor rods, drill bit, grouting pump, grout.
◆ Installing the drill bit: Screw the alloy drill bit onto the front end of the first anchor rod.
◆ Connecting the drilling rig: Connect the anchor rod tail to the drilling rig and align it with the hole position.
◆ Drilling + slag removal: Rotate and impact, and use air/water to remove the slag until the designed depth is reached.
◆ Pressure grouting: Grout through the hollow rod until the grout returns from the hole opening.
◆ Lengthening (if necessary): Use a coupling to connect the next rod body, and repeat the drilling.
◆ Installation: Insert the spacer plate, tighten the nut, and tension for locking if necessary.
◆ Curing: The grout solidifies to reach the designed strength.

About Us

Hebei Tianlong Fastener Co., LTD., founded in 2006, has been deeply engaged in the field of fastener manufacturing for 18 years, and is a modern enterprise integrating scientific research and development, intelligent manufacturing, global marketing and technical services.

The company has always adhered to the innovation-driven development strategy, through systematic talent training, forged a core team composed of senior engineers, innovative technicians and industry elites, combined with advanced management system, automatic machining center and intelligent testing system, to build a full chain of excellence guarantee system through research and development, production and quality control. Continue to provide customers with high-precision, high-strength, high-stability fastening solutions.