Tie Back Anchors

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Tieback anchors are either solid bar or multi-strand tendons that consist of a bond length, free stressing length and anchor tail.

The anchors are installed in a drill hole, which is accomplished using open hole or cased hole drilling techniques. The anchor is grouted, allowed to cure a minimum of 3 days and tensioned, allowing the load capacity derived deep in the ground to be transferred to some structure at the ground surface.

The bond length of the anchor is founded in competent material behind a failure plane, whether it is a defined slip surface or an active wedge of material that tends to slide due to soil properties. The bond length, drill hole diameter and soil properties determine the geotechnical capacity the anchor will develop. The structural capacity is based on the tendon diameter, tendon strength and number of tendons in an anchor.

The free-stressing length is the portion of the anchor that has a grout bond breaker around it and allows the steel tendon to elongate during tensioning and lock-off, thus permitting load transfer to an above ground structure. The bond breaker will consist of a greased and sheathed length of tendon, typically PVC and grease for solid bar tendons and grease and extruded HDPE for strand tendons. Minimum unbonded lengths are 10’-0” for ASTM A722 150 KSI solid bar tendons and 15’-0” for ASTM A416 multi-strand 7-wire 270 KSI tendons.

The anchor tail is required above grade to allow stressing equipment to be installed to place tension on the anchor. The anchor tail contains the anchorage that effectively transfers the load derived deep in the ground to the surface structure and consists of steel bearing plates and hex nuts for solid bar tendons and wedge plates, wedges and steel bearing plates for multi-strand anchors. A hydraulic center-hole jack and stand-off chair is placed over the anchor tail, around the anchorage so crews have access to the hex nut or wedges. The anchor is either proof or performance tested and then returned to a specified lock-off load where the hex nut is fastened securely to the bearing plate, or wedges seated in the wedge plate to hold the tension on the face of the structure after the load is released from the center-hole jack.

Straight Line Construction and Ram Jack companies have installed tieback anchors on many projects in the Rocky Mountain Region.

Tieback anchors have many uses and can be temporary or permanent. They can be used for temporary or permanent excavation support, support of existing structures, seismic upgrades of existing structures, permanent foundation walls, tie-downs for dams, towers and buoyant structures and landslide mitigation.

Tieback anchors and anchor systems are designed in accordance with FHWA-IF-99-015 Geotechnical Circular No. 4 “Ground Anchors and Anchored Systems”, as well as the Post Tensioning Institutes “Recommendations for Prestressed Rock and Soil Anchors”, 5th edition, 2014.

Advantages of tieback anchor systems include:

  • Can develop very large structural capacities.
  • Geotechnical capacities can be increased by increasing drill hole diameters and bond lengths or utilizing pressure grouting and post-grouting techniques.
  • Can be very long (anchors over 50’-0” in overall length typically become multi-strand anchors due to economy and practicality of installation).
  • Suitable for all ground conditions.
  • Limited access installations can occur with multi-strand anchors.
  • Each anchor is tested during tensioning verifying the anchor capacity and the depth in the anchor at which the load transfer is occurring.
  • Utilization of high tensile strength, low relaxation steel tendons ensures tension on the structure is maintained.
  • There are many options for corrosion protection, promoting very long design life.

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Straight Line Construction

Straight Line Construction has changed a great deal over the last 30+ years in the industry, but one thing remains the same: our commitment to quality and to designing and installing permanent solutions to foundation settlement issues. Beginning with small residential jobs more than 30 years ago when the family-owned company was founded by Tim Davis, Sr., Straight Line Construction today repairs cracking residential and commercial foundations through its Ram Jack product toolkit and designs solutions for large infrastructure and industrial projects. We specialize in matching the right solution to each type of foundation repair issue.

Are you building a new home and want to ensure it has a solid foundation? Or is your house experiencing unwanted sagging or a cracking foundation? Are your walls cracked or your doors and windows sticking? As a bonded, licensed, and fully insured foundation repair company, we are proud to serve Colorado homeowners, builders, and commercial contractors. Our technical certifications enable us to offer the highest quality services and the best American-made, environmentally safe products available for foundation repair. Regardless of how your building is shifting or sinking, we can help you stop it. Our 30 years in the business and our designation as a Ram Jack certified dealer means you get the most technologically savvy solution to fix your foundation.

From the factory to the field, we strive to ensure the quality of our products and workmanship meet the highest industry standards. We work with other vetted professionals in the industry. All of our helical piers, push piers, and mounting brackets are manufactured by Ram Jack in Ada, OK, at an ISO-certified facility with American-made steel. Williams Form Engineering in Golden, CO, manufactures our reinforcing bar for ground anchor systems and shares our commitment to quality control and quality assurance.

About Ram Jack

Ram Jack is a family-owned business that began operations in 1968, in Ada, OK, where we currently source our piers and brackets. Back then, concrete piering was the original repair method used simply because it was the only technology available at the time. Over time, it became evident that concrete piers did not provide long-term stabilization of foundations and only provided a short-term warranty period. To guarantee the highest grade of customer satisfaction, a greater solution needed to be found.

The Ram Jack owners embarked on a research program to develop a foundation repair system to stand the test of time. The U.S. Patent and Trademark Office first issued a patent to Ram Jack for its foundation repair system in 1985. Over the next few years, additional refinements and patents have followed, resulting in the strongest patented system in the industry. Ram Jack driven pilings are ICC-ES recognized (International Construction Code—Evaluation Services). Ram Jack is one of only two ICC-ES recognized foundation repair companies in the industry. Ram Jack’s products meet or exceed code requirements set down by ICC-ES for both commercial and residential properties.