Luoyang Gongyan Technology Co., Ltd.| Sourcing Services
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Luoyang Gongyan Technology Co., Ltd.

China Manufacturer with main products: Anchor Bolt, Geogrid, Geomembrane, Waterstop, Rock bolts, friction bolt, split set, self-drilling bolt

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self-drilling anchor bolt

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Export Markets: North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe
Place of Origin: Henan in China

Quick Details

  • Brand Name: Gongyan(GY)
  • Model Number: R25N R32L R32N R32S R38N R51L R51N T76N T76S T30/11 T40/16
  • Material: Steel, 40Cr
  • Process: Hot rolling
  • Diameter: 25-76mm
  • Tensile Load: 200-1900KN
  • Yield Point: 150-1600KN
  • Application: Ming, tunneling, slope, foundation pit


A hollow bar self-drilling anchor consists of

A hex nut

A bearing plate

A coupling sleeve which enables the flexibility in length 

Hollow anchor bar(s)

A sacrificial drill bit

Field of Application

Self-drilling anchors are successfully used for anchoring in poor ground, cohesive and non-cohesive soils, and in case of unstable boreholes. Main applications are:

  • Tunneling and Mining
  1. rock bolting
  2. face anchoring
  3. reinforcement ahead of the tunnel face - forepiling
  4. foot piles
  5. tunnel portals, trenches, and cut and cover areas
  • Special foundations
  1. reinforcement of excavation pits, dams, and slopes - grouted anchors
  2. anchorage of retaining walls and noise barriers
  3. pile foundation and buoyancy control - grouted piles
  • Avalanche protection structures

           anchorage of avalanche barriers

System description

1, hollow bar anchor with continuous hot-rolled outside thread

2, application as injection anchor without casing, especially for non-stable boreholes

3, self-drilling installation, utilization of the anchor bar as drill rod with a single-use drill bit

4, easy extension of the anchor bars by couplings

5, grouting or development of the grout body either simultaneously with drilling using a rotary injection adaptor or afterwards

6, assembly of the anchor head with the anchor plate and the nut, stressing and locking

Prime advantage of the self-drilling anchor

1, easy and similar operation principle for different rock mass and soil conditions

2, drilling, anchoring and grouting can be performed in one single operation

3, no pre-drilling of a borehole by using a casing tube and extension rods with subsequent anchor installation necessary

4, minor space requirement for the accomplishment of anchoring

5, optimized machinery and manpower requirements

6, basic dimensioning of the required anchoring forces by choosing the appropriate anchor type

7, optimum bonding of the profiled anchor rod and the grout

8, adjustment of the drill bit design and diameter to different rock mass and ground conditions

9, simple anti-corrosion method available

10, appropriate for temporary or permanent applications


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