Using earth anchors under buildings

[NoWittyHandle]

Does anybody having any experience in installing earth anchors underneath buildings? I don't have a project where we are thinking of doing this, but I was wondering if anyone out there has done this and how they prevented soil loss while installing the anchors. Thanks for your responses.

 

[geo00]

Eric,

If the soils underneath the building are susceptible to caving you can try using steel casing to install your anchors via the duplex drilling method. You can also try using self drilling hollow bars. Most bar suppliers carry this product.

Keep in mind that if your soils are dense enough and or cohesive enough you may be able to drill the anchors open-hole.

 

[DRC1]

Earth anchors are frequently ised under buildings or other structures with out detrimental effects. I feel they are far supperior to bracing or rakers in the prevention of lateeral movement. Anchors are drilled in a 4 to 6 inch hole. Casing is typically utilized to prevent caving. Once the tendon is installed and the hole imeadiately grouted as the casing is pulled. Min. down angle is typically 15 cegrees (1:4). Anchors are rarely installed at more than 45 degrees and are generally between 15 and 30. Foundation and utilitie locations must be known. On a final note, although tied back sheeting can be utilized for foundation protection in some cases, underpinning is often necessary to support a structure adjacent to or near a hole.