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Micropile Underpinning Bracket

clock April 6, 2009 11:42 by author blogadmin
Micropile underpinning bracket is a new cost effective underpinning product used in the foundation repair industry to handle difficult ground conditions.

Now you can install a pre-engineered foundation repair bracket for your next micropile project that multiples your safety potentials.  Developed as a joint venture between leaders in their respective fields, Earth Contact Products and TEI Rock Drills have put their expertise together to design a system to make the installation of micropile brackets as efficient as other underpinning systems.  Together we have adapted a proven ECP-style underpinning bracket to attach to the TEI Hollow Bar Drilling Rig. How does this work? The new ECP micropier brackets eccentrically transfers the load of the structure to the hollow bar grout column, while maintaining the ability of a continuous manifold lift. This key element in the design allows for engineers and contractors the convenience of a proven, off the shelf bracket system that can easily adapt to micropile applications.  This type of underpinning system can be used on residential and commercial jobs alike. No longer are you restrained from using a underpinning system due to cobbles or other obstructions in the soil.

The Earth Contact Products MP-350 Micropier Bracket System is easily installed into difficult soil conditions that can contain large cobbles, obstructions and layers of rock. The TEI / MP-250 Drill Rig that is used in conjunction with the ECP micro pier bracket system is a lightweight and portable drilling unit and used worldwide in the pier installation industry. With its proven track record, you’ll find that the installation and drilling of the micropile is fast and efficient.  With its grouted column, lateral loading in suspect soils is no longer a problem. The micropile works on skin friction to achieve maximum capacity, also, the ability to achieve capacity through end bearing the pile into a socket in the bedrock makes the ECP micropier a great application in many job site conditions. The micropiers are an engineering feat in themselves.  The hollow bar micro pier installs simultaneously as the core hole is being drilled, the grout is pumped thru the hollow bar, filling the shaft and displacing the cuttings--ALL in a simultaneous operation! Thus, saving much time and labor costs.   

With this addition to the ECP product line, Earth Contact Products is offering contractors and engineers the ability to add value to their businesses by opening up new business opportunities when other underpinning systems may not be able to be installed.  Instead of bearing on shallow layers of bearing structum you now can be assured that your underpinning system has gone below these weak and unveried layers to support structures.

 

                    Benefits of the Micro Pier System:  

  • Bracket is a pre-engineered and pre-tested product
  • Capacity ratings of 75,000-99,000 lbs
  • Quickly  Installs to the TEI Drill Rig MP-250
  • Intregrated Manifold Lift Design
  • Minimal Site Preparation
  • Installs in Low Head Room Areas or Limited Access Areas
  • System Handles Difficult Ground Conditions
  • Easily Load Tested to Verify Capacity
  • Designed to Transfer Load to the Full Length of the Pile
  • Cost Effective due to ease of operation and design



Foundation Repair for Basement or Slab Foundations

clock March 22, 2009 19:26 by author blogadmin
The solution to fixing a settling foundation, is to hire a professional engineer. An expert can provide foundation repair methods to make your home stable.

Does your basement or slab foundation need repaired?

Understanding the reasons for foundation repairs is the first step to deciding which method is best for your home. It is crucial for homeowners to not only understand the reasons for foundation repairs but also the limitations of said repairs. Homeowners must also know who to contact for these repairs. There are many different methods and solutions that must be waded through before making the correct decision for your home and family.

Foundation repair is defined as: the art of underpinning or stabilizing a structure that has moved from its originally constructed design.To underpin a home or structure one must extend the current foundation into a soil strata or layer that is deeper and more stable than the current soil that the foundation is resting upon. This is accomplished by providing additional support from the current footing or wall via piers or anchors. Methods of foundation repairs include push piers, plate anchors, helical anchors or drilled concrete piles.

The people responsible for designing and instituting these methods include foundation engineers and foundation repair contractors. A foundation engineer is responsible to evaluate the structure in question and then provide a proposal for his design. Generally the engineer will recommend a foundation repair contractor to carry out his proposed plan for repair and then sign off on this plan upon the completion of fixing your foundation problem. While it is not always legally necessary for an engineer to be involved it is highly recommended anytime structural repairs are executed.

Inadequate soil conditions are caused by several factors. With suitable building sites becoming more scarce many home builders have been building houses on less than ideal lots. These subpar lots have less than suitable soil conditions to support many structures. There are also homes built on expansive soils that shrink and swell as rainfall and moisture levels change. Due to these conditions foundation support products must be utilized to supply support from deeper layers that are not as affected by fluctuating moisture levels. This underpinning provides a way to lift the home to an acceptable level and prevent additional settlement.

Slab on grade or pier and beam foundations are the most susceptible to weak or expanding soils. Due to the nature of having a large surface area resting on the uppermost soil layers these foundations have a tendency to move as the soil moves. Most slab on grade homes are monolithically poured with the slab and beams cast together creating a rigid foundation. This rigid foundation becomes susceptible to differential settlement when moisture levels under the slab do not remain consistent. This can result from broken water lines, poor drainage or even inadequate guttering. Trees can also affect soils by their roots drying out areas under these slabs while the rest of the slab has normal moisture content.

Differential settlement causes slab on grade foundations to rise on the perimeter (dish) or fall around the perimeter (dome). Steel push piers and helical piers are generally an engineer’s recommended solution for these conditions. These piers penetrate through unstable soils down to a more consistent soil layer that has adequate strength to support the structure. These piering systems provide a deep foundation that can now be lifted off of to regain an adequate elevation.

In the case of homes with basements, expansive clay soils that have been over saturated with water can cause hydrostatic pressure on walls. This newly imposed pressure can cause wall bowing and concrete cracking. In extreme cases, catastrophic failure can occur from these wall stresses. When basement homes are originally designed it is with normal moisture content. Poor drainage often causes undue pressure to build behind basement walls exerting forces on the basement foundation. This is often the source of concrete cracking and water to infiltrate the space. Once again it is generally the differential movement that causes the foundation repair problem.

There are two common fixes to bowing basement walls. Plate Anchors (wall anchors) are an effective solution for many homes. These wall anchors are embedded into competent soils beyond a zone of influence surrounding the structure. Threaded rods are then connected to these anchors on one end with the opposite end being attached to a wall plate inside the basement. With this system total excavation is not required and because of this additional soil load, wall recovery is accomplished over time with continued tightening of the anchor rods.

Next, there are helical tiebacks. This system of basement or retaining wall anchoring involves the complete excavation of the affected area. Helical anchors are screwed into the soil hydraulically, and then attached with a wall plate situated inside the basement wall. With the full excavation the wall can be instantaneously pulled back to plumb. The helical anchor can resist very heavy loads due to their design and the fact of their installation force equates to their resisting force.

Whatever the solution to your concrete cracks knowing the cause of your foundation problem is the first step to fixing your foundation. Hiring a professional engineer is always the first step to making your home structurally sound. Now go out and check your foundation for a concrete crack or settlement.



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