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T Thread Self Drilling Hollow Anchor Rod

T threads are designed and produced in accordance with T international standards and can be quickly connected and installed on site.

Category:

Rock Bolt

Email:

liudong@tl-fastener.com

Email:

bolt@tl-fastener.com

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产品描述

Product Description

T threads are designed and produced in accordance with T international standards and can be quickly connected and installed on site. Hollow rods have left-hand or right-hand threads for standard rotary impact drilling.

The relative rib area FR, as a parameter of the bonding quality, is close to the optimal value FR = 0.21-0.33. In addition to good bonding, the 45° angled rib surface reduces splitting forces. Crack width at maximum load is less than 0.1 mm.

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.

T Thread Self Drilling Hollow Anchor Rod

SIZE	OD(MM)	ID(MM)	Cross Sectional Area(MM²)	Ultimate L(KN)	Yield Load(KN)	Weight(KG/M)	Length(M)
T30/16	30	16	343	220	180	2.70	(1)×2,×3,×4,×5,×6,×7,×8,×9,×10
T30/14	30	14	356	260	220	2.80
T30/11	30	11	406	320	260	3.25
T40/20	40	20	713	540	430	5.60	(1)×2,×3,×4,×5,×6
T40/16	40	16	910	660	525	7.15	(1)×2,×3,×4,×5,×6
T52/26	52	26	1250	929	730	9.90	(1)×2,×3,×4,×5,×6
T73/53	73	53	1680	1160	970	13.20	(1)×2,×3,×4
T73/56	73	56	1369	1194	785	10.75
T73/45	73	45	2267	1588	1270	17.80
T73/35	73	35	2700	1875	1430	21.20
T76N	76	51	2000	1600	1200	16.50	(1)×2,×3,×4
T76S	76	45	2400	1900	1500	19	(1)×2,×3,×4
T103/78	103	78	3220	2280	1800	25.3	(1)×2,×3,×4
T103/51	103	51	5680	3460	2730	44.6	(1)×2,×3,×4

Advantages

1. Especially suitable for difficult ground conditions.

2. High installation rate since drilling, pouring and grouting can be completed in one operation.

3. Drilling and grouting can be performed at the same time during installation.

4. Suitable for working in limited space, height and inaccessible areas.

5. Hot-dip galvanizing to prevent corrosion.

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.