Self Drilling Anchors Bolts T Thread

Description

The Self Drilling Anchors Bolts T Thread features a continuous T-shaped thread, combining the functions of a drill pipe and grouting pipe. Suitable for fractured and difficult-to-drill formations, it supports simultaneous drilling and grouting, can be cut and connected, offers strong anchoring force, and boasts high construction efficiency.

Features of the Self Drilling Anchors Bolts T Thread:

1. Thread Structure: The Self Drilling Anchors Bolts T Thread employs a continuous T-shaped thread (non-standard R-type), with a thread depth typically ranging from 1.5 to 3.0 mm. This enhances the interlocking force with the soil and rock while retaining a hollow channel for grouting and cuttings removal.

2. Integrated Functionality: The Self Drilling Anchors Bolts T Thread integrates the drill pipe, grouting pipe, and anchor bolt into a single unit. Combined with a self-drilling drill bit, it enables simultaneous drilling, grouting, and anchoring, eliminating the need for casing and significantly reducing the risk of borehole collapse.

3. Construction Adaptability: The rod body can be cut arbitrarily and extended using connecting sleeves, suitable for narrow spaces or complex terrains (such as tunnels, slopes, and foundation pits); the grouting pressure generally reaches 1.3 MPa, achieving dense filling throughout the entire section.

4. Mechanical Properties: The maximum pull-out force of Self Drilling Anchors Bolts T Thread can reach 400 kN (22%–29% higher than traditional anchor bolts), and it is mostly used in weathered rock, gravel, fault fracture zones, and other easily collapsible strata.

5. Components: Self Drilling Anchors Bolts T Thread includes a hollow rod body (T-thread), self-drilling bit, connecting sleeve, washer, nut, and centering device (some include a grout stop plug). The materials commonly used are high-strength alloy steel or stainless steel (when corrosion protection is required).

6. Limitations: T-type threads do not have a unified national standard (unlike R-type which has clear specifications), so the compatibility with the manufacturer must be confirmed when selecting a model; the cost is higher than ordinary anchor bolts, but the overall efficiency is higher and the construction period is shorter.

Applications of Self Drilling Anchors Bolts T Thread:

Self Drilling Anchors Bolts T Thread is widely used in tunnel pre-support, mine roadways, slope reinforcement, and old building repair, especially in geological conditions where conventional drilling is not feasible.

Self Drilling Anchors Bolts T Thread is primarily used for geotechnical engineering support under complex geological conditions such as fractured, loose, and easily collapsed boreholes. It integrates drilling, grouting, and anchoring functions, and is suitable for tunnels, slopes, foundation pits, mine roadways, and old building reinforcement.

1. Core Application: Enables simultaneous drilling and grouting in difficult-to-drill strata (such as gravel, weathered rock, and fault fracture zones), simultaneously completing borehole formation and anchoring, effectively preventing borehole collapse, improving grout fullness, and enhancing anchoring reliability.

2. T-type thread characteristics: The trapezoidal thread cross-section offers stronger shear and torsional resistance, facilitating rapid extension of multiple rods via connecting sleeves. It also supports on-site cutting to adapt to different hole depths, offering flexible construction, especially suitable for narrow or confined spaces.

3. Typical projects: Tunnel pre-support, steep slope reinforcement, foundation pit support, transmission tower/wind turbine foundation reinforcement, and emergency rescue projects after floods or earthquakes.

4. Difference from Self Drilling Anchor Hollow Bar R Thread: T-type (trapezoidal) threads prioritize high load-bearing capacity and connection reliability, commonly used for large diameters (e.g., T52 Self Drilling Anchor Bolt, T76 Self Drilling Anchor Bolts) or high-stress environments; R-type (e.g., R25 Self Drilling Anchor Bolts, R32 Self Drilling Anchor Bolts) are mostly used in conventional medium-load-bearing scenarios. Both are fully threaded hollow anchor rods, but the T-type offers superior extension stability and anti-slip properties.

5. Self-Drilling Anchors Bolts T Thread are not suitable for solid hard rock (without self-drilling) or permanent anchor projects that require prestressing. Their advantage lies in the “drilling, grouting and anchoring integration” and adaptability to complex formations, rather than simply high-strength anchoring.

Specifications of Self-Drilling Anchor Bolts:

PRODUCT DISPLAY

​

APPLICATION

Mainly used in slope engineering, foundation and foundation engineering, tunnels and underground engineering,etc., such as various slope support, foundation pit support, tunnel pipe shed support, basic support of transmissiontowers or wind power towers, old Building repairs and reinforcement of existing structures, etc.

PACKING & DELIVERY

Shipping By Sea

1. Standard packaging
2. Packaging according to customer requirements

FAQ

Q: Can I get samples before order ?

A: Yes, of course. Usually our samples are free,we can produce by your samples or technical drawings.

Q: Can I go to your factory to visit?

A: Of course, we welcome customers from all over the world to visit our factory.

Q: What product information do I need to provide?

A: You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.

Q: Does the product have quality inspection before loading?

A: Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we accept third party inspection.

Q: How do we trust your company?

A: We specialise in steel business for years, headquarter locates in Liaocheng, Shandong province, you are welcome to investigate in any ways, by all means, we have CE and ISO9001 certificate, quality can be guaranteed.