GROUND ANCHORS / ROCK ANCHORS

Learn More

Ground Anchors or Rock Anchors are Deep Foundation elements designed to transmit a tensile load to the soil or rock into which they are embedded.  They are often used in applications with uplift in bridge structures, cantilevered foundations, buoyant uplift in structures below groundwater tables, and horizontally to provide resistance to lateral earth pressures in retention structures.


Post-tensioned ground anchor design and installation is covered by specifications from the Post Tensioning Institute (PTI), Deep Foundation Institute (DFI), and the International Association of Foundation Drilling Contractors.


Post-tensioned ground anchors consist of a steel tendon subdivided into three sections:


Anchorage - a combination of the anchor head, bearing plate, and trumpet that connects the anchor to the resisting structure; 


Bonded Length - the area permanently grouted in place to the rock or soil around it; 


Unbonded (Free) Length - the portion of the anchor that is "free stressing" between the anchorage and the bonded length.  Free Length is created by encasing the unbonded length of the tendon in (typically plastic) sheathing.


Ground Anchors are characterized by the fact that they are Post-tensioned (pre-stressed) after being grouted in place.  

Contact FSGC

FSGC is committed to safety, service, and excellence.  We look forward to partnering with you to design and build the best solutions for your project.

Contact Us
Rock Anchors at CARTI in Little Rock, Arkansas prior to the foundation pour and post-tensioning.

VERTICAL UPLIFT

Ground Anchors may be installed to counter vertical uplift in a structure created by hydrostatic or overturning forces.  Examples include Rock Anchors to tie down a cell tower to counteract overturning due to wind loading or Ground Anchors to resist uplift created by a high underground water table.

image165

ANCHORED WALLS

Used for temporary Support of Excavation (SOE) or permanent anchored walls, Ground Anchors can be employed to stabilize slopes or excavations by providing lateral resistance to the horizontal pressures applied to the vertical elements of the wall.

Post-Tensioning a Rock Anchor at CARTI in Little Rock, Arkansas.

POST-TENSIONING THE ANCHOR

Ground Anchors are post-tensioned after the grout has set.  A hydraulic ram is used to pre-stress the free length and then the anchorage is installed.

FEATURED GROUND ANCHOR PROJECTS

Rock Anchors: CARTI Little Rock Anchored Foundation




CARTI

Little Rock, AR

GO TO PROJECT

Rock Anchors: Crystal Bridges Museum of American Art




Crystal Bridges

Bentonville, AR

GO TO PROJECT

FSGC is a member of:

image166
image167