Determining Helical Pier and Anchor Capacity 14 Jun 2019, 2:21 am

Please watch an in depth discussion concerning tension and compression tests involving CHANCE Helical Piers and Anchors.

Helical Pier and Anchor Capacity

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Helical Pile Shake Table Testing 13 Jun 2016, 10:27 pm

The largest outdoor shake table in the world demonstrated the seismic test of helical piles lead by Dr. Amy Cerato, P.E. at the University of California, San Diego Jacobs School of Engineering.

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What is a Helical Pier? 3 Jul 2013, 7:54 pm

A helical anchor/pile is an extendable deep foundation system with helical bearing plates welded to a central steel shaft. Load is transferred from the shaft to the soil through these bearing plates. Central steel shafts are available in either Type SS (Square Shaft) series or Type RS (Round Shaft) series. The Type SS series are available in 1-1/4″ to 2-1/4″ square sizes. The Type RS series are available in 2-7/8″ to 4-1/2″ diameter sizes. Type SS-RS combinations are also available for compression applications in soil conditions where dense/hard soils must be penetrated with softer/loose soils above the bearing strata. The Helical Pulldown®Micropile series is also used in applications similar to those requiring the use of the Type SS-RS combinations.

Segments or sections are joined with bolted couplings. Installation depth is limited only by soil density and practicality based on economics. A helical bearing plate or helix is one pitch of a screw thread. All helices, regardless of their diameter, have a standard 3″ pitch. Being a true helical shape, the helices do not auger into the soil but rather screw into it with minimal soil disturbance. Helical plates are spaced at distances far enough apart that they function independently as individual bearing elements; consequently, the capacity of a particular helix on a helical anchor/pile shaft is not influenced by the helix above or below it.

Click on any of the tiles at the top of the page to learn more about this product’s technical specifications, download drawings, or feel free to contact us with any questions you may have.

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Atlas 16 Jan 2013, 8:53 am

The Atlas Resistance® Pier is a manufactured, two-stage product designed specifically to produce structural support strength. First, the Pier Pipe is driven to a firm bearing stratum; then the lift equipment is combined with a manifold system to lift the structure. The Atlas Resistance® Pier System procedure provides measured support strength. Atlas Resistance® Piers are spaced at adequate centers where each pier is driven to a suitable stratum and then tested to a force greater than required to lift the structure. This procedure effectively load tests each pier prior to lift and provides a measured Factor of Safety on each pier at lift.

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Basement Wall Repair 6 Dec 2012, 10:29 am

Screw anchors can help prevent wall movement by holding the wall when soil swells and the resulting pressure pushes against the wall.

Retaining walls can be designed using screw anchors with a modest increase in cost. Proven and building code accepted, these anchors will keep retaining walls from moving.

Basement walls can be repaired using helical screw anchors. This is accomplished by drilling a small hole for the anchor rod to pass through the basement wall, and then excavating a hole outside to place the bearing plate. A small high torque motor then rotates the screw anchor system into the soil. Once depth and predetermined torque is achieved, the anchor is terminated and a plate is mounted inside the basement wall to hold the wall in place. If the wall needs to be moved, then sufficient soil must be removed to allow the wall to move.

The solution to your foundation problems comes from the world leader in screw anchor development. CHANCE anchoring systems, widely used since 1907 in thousands of construction projects, brings the finest in materials, service and quality to your foundation. All dealer/representatives are thoroughly trained and certified in installation procedures and are supported by the extensive technical-support services of CHANCE.

Sinking foundations, cracked and buckled walls and uneven floors are problems commonly faced annually by some quarter-million homeowners. Homes and other structures situated on unstable soils settle when their foundations are subjected to extreme moisture conditions or lack proper drainage. A shifting foundation may result in structural damage to your home and a loss of your investment.

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Engineers 6 Dec 2012, 10:28 am

Engineers – We are you one stop shop for technical literature, software, and design assistance.

Located at the top of the page are various tiles providing drawings, specifications, and literature for our products. We also offer a free copy of the Helicap Software.

Welcome to HeliCAP® Helical Capacity Design Software. Version 2.0 adds exciting new features.

It’s still the only interactive software in the industry that helps you solve your tension and compression project requirements with helical anchors. It performs powerful calculations on your site soil parameters to help you build better and faster. Use it for designing foundations, tiebacks, soil nails, heavy guyed loads.

Available on CD, it includes Help screens and Reference materials as close as your keyboard. It gives you prompts to maintain control over essential criteria to effect the same process CHANCE® anchor-application engineers employ daily to analyze problems and specify solutions.

To Get Your Copy, please contact our office and we can provide you instructions to get the software.

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Chance Civil Construction 5 Dec 2012, 1:55 pm

Click Here to watch a short video on Chance’s Civil Construction division and their dedication to their customers.

Since 1912, Chance has been the international leader in earth anchoring. Our helical piles are used worldwide to secure residential and commercial buildings, tower foundations, heavy equipment foundations and many other deep foundation applications. CHANCE® helical piles are approved by all national building code agencies.

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Heavy Construction 5 Dec 2012, 1:48 pm

Whether you are needing compression or tension loads to secure your structure, we can help.

Helical Concepts, Inc. can provide design assistance to your heavy commercial projects.

• Commercial New Construction
• Commercial Remedial Repair
• Tiebacks
• Soil Nails using the Chance Soil Screw System
• Pipelines
• Mooring

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Tower Foundations 5 Dec 2012, 11:27 am

Applications for guyed structures, self-supporting towers, structures substations, and switching stations are all part of the CHANCE T/C (tension-compression) foundation and guy anchor product line. Applications in sensitive areas, high water tables, difficult access as well as normal soils make the CHANCE T/C foundation a priority in transmission line construction.

The CHANCE guy anchor, Type SS, made with A. B. Chance proprietary high strength steel can have capacities to 200,000 pounds tensile load. These anchors have been field proven over decades of service under the severest conditions. Please click the links below for the Chance “Encyclopedia of Anchoring.”

Section A

Section B Anchors

Section B Tooling and Installation

Section C

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A Solid Foundation for Homeowners 5 Dec 2012, 8:39 am

Generally, a family’s home is their largest investment. One of the best ways to protect that investment is with Chance Helical Piles.

CHANCE manufactured anchors are rated up to 100,000 pounds each. These are available in round or square shafts manufactured from high-strength galvanized steel. Special patented brackets are used to stabilize or lift foundations in distress. CHANCE is the only company with a pre-engineered and manufactured underpinning system evaluated and listed by all the national building code agencies.
•ICC-ES Report # ESR 2794

Once your CHANCE certified installer has received the plan of repair from a qualified design group or individual, he can proceed with the repair. Remember, one of the best investments you can make is to get a soil boring on your property. This will enable the designer to determine what type of anchor and to what depth it must go to stable soil. Usually the installer will excavate a hole at each anchor location wide enough and deep enough to place a bracket under the foundation. The leading section of the anchor with the proper number and size of helices will be installed by a rotary installing machine. Extensions are added until the helices are at the proper depth and the predetermined torque is achieved. At that point the bracket is added, the load is transferred to the anchor, and the building can be stabilized or lifted according to the plan of repair.

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