Self Drilling Anchor Hollow Bar R Thread

Description

Self Drilling Anchor Hollow Bar R Thread, also known as Self-Drilling Anchor Bolt or Self Drilling Anchor Bar, is a geotechnical support component that integrates drilling, grouting, and anchoring functions. Its rod body is a full-body hollow steel pipe with R-shaped threads, serving as both a drill rod and a grouting pipe.

Features of the Self Drilling Anchor Hollow Bar R Thread:

1. Integrated Structure: The rod body features continuous R-shaped external threads (usually right-handed, conforming to standard thread profiles), allowing it to be directly used as a drill rod for drilling. It does not need to be pulled out after drilling, and the hollow channel enables simultaneous drilling and grouting, completing drilling, anchoring, and reinforcement in one operation.

2. Applicable Geological Conditions: The Self Drilling Anchor Hollow Bar R Thread is particularly suitable for fractured, loose, gravelly, strongly weathered rock, or easily collapsed formations, avoiding the problems of hole collapse and diameter reduction in traditional drilling processes.

3. High Efficiency: The rod can be cut to any length and extended using connecting sleeves, adapting to narrow or complex working spaces; it is equipped with self-feeding drill bits (such as cross-head and ball-tooth alloy drill bits) for efficient drilling.

4. Mechanical Properties: The R-type thread enhances the bond and anchoring force with cement mortar/grout. Common specifications for Self Drilling Anchor Hollow Bar R Thread include R25 Self Drilling Anchor Bolt, R32 Self Drilling Anchor Bolt, R38 Self Drilling Anchor Bolt, and R51 Self Drilling Anchor Bolts, with a yield load range of approximately 150–630 kN (depending on diameter and material).

5. Complete Components: The Self Drilling Anchor Hollow Bar R Thread consists of a hollow rod (R-thread), drill bit, connecting sleeve, washer, nut, and centering device (optional). Grouting pressure typically reaches 1.0–1.3 MPa to ensure full grouting.

6. Difference between Self Drilling Anchor Hollow Bar R Thread and Self Drilling Anchors Bolts T Thread: R-type threads have a standard thread profile (similar to ordinary bolts), offering good machining and interchangeability; T-type threads are mostly special trapezoidal or non-standard threads, emphasizing high torque transmission but with limited interchangeability, while R-type is more versatile.

Applications of Self Drilling Anchor Hollow Bar R Thread:

Self Drilling Anchor Hollow Bar R Thread does not rely on casing for wall protection, significantly improving construction speed and reducing overall costs. It is widely used in tunnel pre-support, foundation pit slopes, mine roadways, and old building restoration projects.

Self Drilling Anchor Hollow Bar R Thread is mainly used in complex strata such as fractured, loose, and easily collapsible boreholes to achieve integrated drilling, grouting, and anchoring geotechnical engineering support.

1. Core Applications: Provides rapid and reliable active support for difficult-to-drill strata such as weathered rock, gravel, miscellaneous fill, mudstone, and fault fracture zones in tunnel, slope, foundation pit, and mine roadway engineering.

2. Structural Features: The hollow rod body features an R-shaped (standard thread, often with a “rope-like” or isosceles triangular cross-section) design, serving as a drill rod, grouting channel, and anchoring reinforcement. With a specialized drill bit, grouting can be performed simultaneously during drilling, eliminating the need for casing.

3. Typical Applications: Suitable for confined spaces and locations where traditional drilling rigs cannot be used, such as urban underground engineering, existing building reinforcement, emergency rescue, and advanced support for weak surrounding rock.

4. Advantages: Drilling, grouting, and anchoring are completed simultaneously. Grouting pressure can reach 1.3 MPa, effectively filling fissures and increasing anchoring force (e.g., R32 yield load is approximately 160–280 kN), significantly reducing the risk of borehole collapse and improving construction efficiency.

Specifications of Self-Drilling Anchor Bolts:

PRODUCT DISPLAY

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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.