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Major Foundation Repair Issues in Atlanta

clock July 7, 2011 19:41 by author blogadmin
ECP helical piers were used to make major foundation repairs for a home suffering from foundation issues.

http://www.youtube.com/embed/68V6JYHYPuA

 

This is a video link to a job that Atlas Piers of Atlanta has been called in to solve.  The current homeowner bought the house after helical piers were installed poorly to fix a foundation problem over a debris pit (buried wood debris under the foundation). The helical piers were installed but did not penetrate the debris. Atlas Piers of Atlanta installed 3 resistance piers (or push piers) a few years later on another area of the house. Since the original helical piers failed due to poor installation (the company has since gone out of business, but started another piering company), Atlas Piers of Atlanta is now repairing the area above the debris pit with resistance piers manufactured by Earth Contact Products.



Foundation Issues Job in Boston

clock June 23, 2011 07:31 by author blogadmin
Helical piers are used for a limited access foundation project in Boston by Atlas Systems of New England.

Local Contractor looks to Atlas System of New England for Foundation Support

A local Chinatown contractor wanted to build a 5-story addition to an existing structure but was stymied by foundation issues: how to support a 5-story building with the difficult soil conditions often found in the Boston area; with these soil types it was apparent that a deep foundation system was needed but which type and the footprint of the new addition is located within a walled area several building lots from the closest cross street and highly inaccessible. Because restricted site accessibility, poor soil conditions, and the need for a deep foundation system, there was only one possible solution. The solution involves utilizing Atlas Systems of New England to install a helical pier foundation support system specifically designed for the client.

Foundation Repair Solution

helical piersBy installing helical pier foundation solutions, your foundation becomes stable and secure with little to no disturbance to the worksite. Helical piers is a structural piering devices for residential and commercial foundation applications in use today. When installed deep into stable soil they can be used to lift homes, stabilize foundations, elevate walkways, and retain walls.

The process to design a proper deep foundation support system for this project was dependent on the following:

    • Having a series of soil borings taken on-site to determine actual soil classification, location and depths of soil strata, and soil bearing capacities.

    • Having a geotechnical/structural engineer review the soils to determine what type of deep foundation system is best suited for the project.

    • Develop a foundation plan showing pile design, pile locations, and depths of installation.

    • Keeping accurate pier installation logs that record depths of piers and installation torques.

Atlas Systems of New England was subcontracted by the contractor (CC Brothers of Chinatown) to provide the deep foundation helical pier support system for this project. Our team of professionals offer the best foundation repair solutions to fix any situation. The Structural Engineer for this project hired by the owner was:

Mark Liao, P.E. Liao Associates, Inc. 625 Bedford St. E. Bridgewater, MA 02333

For additional information on this project please contact: 
Dennis P. Geisser at Atlas Systems of New England. Call 800-688-9774 and visit us at www.atlassystemsnewengland.com.



Carbon Fiber and Basement Walls

clock June 16, 2011 13:41 by author blogadmin
Carbon fiber was used for race cars, now it is used in the foundation repair industry to fix cracking and bowing basement walls.

Using Carbon Fiber to Repair Basement Walls

 

What is basement wall grade carbon fiber? We have all heard of it being used for race cars, NASA and tennis rackets, but basement wall reinforcement? Why would it be used in foundation repair applications?

Carbon fiber is lightweight, noncorrosive and virtually impossible to stretch. With a tensile strength of more than 350,000 psi makes it up to 10 times stronger than steel. Accordingly, high-quality carbon fiber provides an alternative to such intrusive methods as installing steel beams with heavy equipment to brace and shore up foundation walls: no digging, jackhammering, moving utilities and ductwork are required.

A foundation's structural integrity becomes compromised when hydrostatic and lateral earth pressures exceed the strength of a concrete or masonry wall. As lateral pressures press upon the foundation, basement or crawlspace walls bow inward. Its effectiveness in counteracting such tendencies is based on standard engineering principles following Hookes law and a linear stress/strain relationship. For every action there is a reaction, the action is the soil pressing on the basement wall and the reaction is the carbon fiber applying a resistant force, making the wall stronger to help eliminate shifting, cracking and bowing.

One of the other big benefits of carbon fiber is its ease of use and aesthetics. You will not have I-beams lined across the basement wall. The thin layer of carbon fiber material can be painted over without creating an eyesore. Ductwork and plumbing penetrations can be left alone due to its flexible nature.

Bowing Wall Repair Using Carbon Fiber

In most residential situations where bowing basement walls occur there are several sets of forces which interact to cause the problem. The largest mobilizing force is the addition of lateral earth pressure (soil forces) in conjunction with hydrostatic pressure (water forces). These forces put a horizontal load on the wall which in turn creates a large amount of bending stresses on the masonry or concrete. The bending stress creates an unbalanced condition within the wall due to the very low tensile capacity of concrete and masonry, causing horizontal cracking in the structure. The weight of the structure above the wall helps generate a stabilizing compressive force on the wall until the lateral deflections become too large. As the wall deflects beyond the "center of mass" of the above structure a phenomenon known as the "beam-column effect" creates additional bending stresses on the damaged wall, speeding up deterioration. Carbon Fiber Reinforced Polymers (CFRP's) provide the required additional tensile force needed to fully develop the compressive strength and create a "balanced" situation within the wall to prevent further bowing and cracking. 

Wall Crack Repair Using Carbon Fiber

Carbon fiber fabric is placed over basement wall cracks to provide strength to the cracked area. No drilling is necessary as with other crack repair systems. The advantages of using carbon fiber fabric to repair wall cracks are:

    •Lightweight

    •Flexible wrap conforms to any shape

    •Minimal change to structure's shape

    •Repair time is minimal - minimizing cost

    •Minimal disruption and noise

    •Heavy equipment is eliminated

ECP Carbon Fiber products provide our customers with a durable, high strength, and aesthetically appealing fix to the common problem of bowing basement walls. The repairs are waterproof and can enhance the flexural capacity of steel reinforced and un-reinforced masonry walls the original capacity. The high stiffness of these Carbon-based products can stop lateral wall movement virtually instantaneously without the problems associated with steel alternatives including corrosion, aesthetics, obstructions, and lower strength capacities. The epoxy polymers used to bond the Carbon fiber systems to your basement wall have been successfully tested over 20,000 hours of continual exposure to resist chemicals, temperatures, and moisture much more aggressive than typical basement environments assuring a long-term repair.



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