R38N/21 R38N/19 Self-drilling threaded hollow bolt is a self-drilling bolt system composed of hollow steel bars, couplers, nuts, and steel backing plates. It can provide cost-effective anchoring solutions for unstable ground conditions and cracked rock formations. It is divided into R Thread Self Drilling Anchor Bolt and T Thread Self Drilling Anchor Bolt.
The Hollow anchor rods is a fully threaded self-drilling anchorage system which can be simultaneously drilled and grouted into loose or collapsing soils and brittle rock without the need for a casing.
JiuFu Self Drilling Anchor Bolts System provide superior and cost effective bolting solution for unstable ground conditions such as sand, gravel, silt, and clays and in fractured rock formations.
R38N/21 R38N/19 Self Drilling Anchor Bolt hollow steel bars are produced in sections with standard lengths of 2.0, 3.0 or 4.0 m. The standard outer diameter of the hollow steel bars ranges from 30.0 mm to 127.0 mm.
| 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 |
Range of applications:
• micropiles for foundation underpinning (anchors with larger diameter)
• anchors against uplift
• anchors for protection of rock slopes and building pits
• anchors for stabilization of soil slopes (soil nailing)
• anchors for stabilization of embankments
• anchors for protection of retaining structures
• drains (drainage of water)
The self drilling anchor is optimized and tailored to the projects needs. Lean manufacturing methods are adopted to keep the lead times low and deliveries reliable. The production process is closely monitored and quality is controlled at every stage of the manufacturing process.
Supporting materials for coal mining, construction engineering and large-scale concrete projects include:
Range of applications and advantages of self drilling anchors
The basic application of self drilling anchors is installation under the conditions of the soil/rock with the risk of drill hole collapse due to pulling out of drill bit as in the classical anchor installation process.
R38N/21 R38N/19 Self drilling anchors can be installed in length greater than classic rod anchors (joining of a hollow steel bar with coupling nuts).
Hebei Jiufu Industrial and Mining Parts Co., Ltd. is a manufacturer specializing in the supply of supporting materials for coal mining, construction engineering and large-scale concrete projects. It mainly produces self-drilling bolts, friction bolts, glass fiber reinforced plastic solid bolts
