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self-drilling anchor bolt

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Product Details

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

Specifications

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

rock bolting
face anchoring
reinforcement ahead of the tunnel face - forepiling
foot piles
tunnel portals, trenches, and cut and cover areas

Special foundations

reinforcement of excavation pits, dams, and slopes - grouted anchors
anchorage of retaining walls and noise barriers
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

Service Process

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