Hebei Tianlong Fasteners Co., Ltd

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R Thread Self Drilling Hollow Anchor Rod

The anchor itself is a full-length thread, which can be cut at will according to customer requirements and lengthened with a coupling.

Category:

Rock Bolt

Email:

liudong@tl-fastener.com

Email:

bolt@tl-fastener.com

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产品描述

Product Description

R-threaded self-drilling anchors are fully threaded, with specifications ranging from R25-R51. It consists of hollow anchor rods, nuts, anchor plates, couplers, drill bits and other components. Due to the functions and characteristics of its own system, it can ensure the anchoring effect under complex foundations during construction. It can be widely used in railways, subways, mines, tunnels and other projects to ensure the stability of the foundation and play a very importment role in safety protection. It Provides solutions for anchoring, micro-piling and in the complex foundation conditions.

1. Hollow anchor：

The anchor itself is a full-length thread, which can be cut at will according to customer requirements and lengthened with a coupling. Continuous threads like waves can bond well with cement slurry to achieve better anchoring effect.

2. Anchor nut：

Nuts are connecting devices used with pallets.

3. Pallet (hot rolled steel plate)：

The function of the pallet is to exert anchoring force on the surrounding rock, transfer stress, increase end force, and enhance the anchoring effect. The pallet is installed at the end of the hollow anchor rod, between the nut and the rock formation. According to the shape, it can be divided into dome plate and flat plate.

4. Anchor Coupler：

It is a component used to connect two bolts to each other and can be heat treated according to customer requirements.

5. Drill bit：

A drill bit is a device that performs and withstands the drilling process. Choose from a variety of unique drill bit structures for different rock types.

The biggest difference between this drill bit and other anchor drill bits is that it is disposable. Once the drill bit is drilled with the hollow anchor system, it can never be pulled out again. This also saves the replacement process and simplifies the construction steps. Save a lot of time and cost.

6. Centralizer：

The main function of the centralizer is to maintain the correct position of the anchor bolts during installation. When the hollow anchor rotates at high speed in the hole, ensure the smooth operation of the anchor and keep the drill bit axis as close as possible to the center line of the drilling hole. Without a centralizer, the bolts may deviate from their original positions under harsh ground conditions, affecting the anchoring effect and structural stability.

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.

Anchor Hollow Bar Technical Data

SIZE	OD(MM)	ID(MM)	ULTIMATE LOAD(KN)	YIELD LOAD (KN)	WEIGHT(KG/M)	LENGTH(M)
R25N	25	12	200	150	2.3	1M-9M
R32L	32	22	260	200	2.8	1M-9M
R32N	32	21	280	230	2.85	1M-9M
R32N	32	18.5	280	230	3.4	1M-9M
R32S	32	17	360	280	3.45	1M-9M
R32SS	32	15	405	300	4.1	1M-9M
R38N	38	22	500	500	4.8	1M-9M
R38N	38	19	400	400	5.5	1M-9M
R51L	51	36	550	450	6.3	1M-9M
R51N	51	33	800	630	7.8	1M-9M

Advantages

1. Easily penetrates various rocks and can work under complex and broken foundation conditions.

2. It can be elongated by using couplers.

3. No need to pull it out.

4. The hollow rod can be used as a grouting channel.

5. Drilling, grouting and anchoring can be completed at the same time.

6. With optional epoxy coating to prevent corrosion and can be permanently applied.

7. There are two thread types to choose from (R type and T type)

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.