Rock Anchor
Ground Anchors are basically devices used to transmit the forces to the soil by means of prestressed tendon to anchor the Structure to the ground or to retain the slopes from collapsing.
Types of Ground Anchors:
PRESTRESSED GROUND ANCHORS
- Based on The Anchorage Zone
- Rock Anchors- Fixed length is anchored in the hard rock
- Soil Anchors- Fixed length is anchored in the Soil
- Based on Nature of Structure
- Permanent Anchors – Permanent ground anchors have to guarantee their function during the lifetime of the structures to be anchored
- Temporary Anchors – Prestressed anchors, which have to fulfill their function only for a limited time
- Based on How it is installed
- Vertical Anchors – These anchors are provided vertically into the ground
- Inclined Anchors – These anchors are provided at an angle into the ground
- Based on Application
- Test Anchors – Test anchors are specially design anchors subject to extensive tests in order to obtain, either comprehensive information on anchor capacity and geo-technical conditions, or to prove the quality and adequacy of design, material and construction
- Control Anchors – Control anchors are anchors in or beside the structure used for long-term observation. They are often equipped with devices, which monitor the variation of forces and displacement.
Application:
1) Stabilization of Unprotected Slopes or man made cuts:
2) Securing Structures below Groundwater level against Buoyancy
3) Anchoring Concentrated tensile Forces as for Cableways or Bridge abutments
4) For Retaining Walls Or for Excavation
Components of the Anchor:
1) H T Strand (12.7 mm or 15.2 mm dia.)
2) Anchor Head
3) Thrust plate
4) MS/HDPE Sleeve
5) Spacers
METHODOLOGY FOR GROUND ANCHORS:
Rock anchoring work is carried out in the following steps-
- Drilling
- Water Test ( Permeability test)
- Virgin Grouting
- Re-drilling
- Homing
- Primary Grouting ( Fixed length grouting)
- Stressing
- Secondary Grouting
Inclined rock/rod anchor for slope stabilisation
Inclined anchor for excavation
Inclined anchor for basement excavation
Vertical anchor for uplift pressure in foundation
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