GP Structural Ltd
 

 

 

Screw Piling


As the Midlands premier installer of the Chance Helical pier foundation system, GP Structural can
design, supply and install foundation, anchoring and retention systems for compressive and tensile situations.                                                                                                                                    
Using the Chance Helical piers, up to 350kN ultimate loads can be reached using handheld equipment even in the most restricted access situations.
In almost any ground conditions, these products offer rapidly installed anchoring and foundation systems with the ability to take immediate loading.
Used in combination with a masonry beaming system the screwpiles are used as a standard pile and beam repair method with considerable cost, time and disruption free benefits over traditional underpinning. The underpinning bracket consisting of a lifting assembly, is designed to lift with hydraulic jack assistance. 
Higher capacity screwpile installations using a power head attached to a jcb or similar can be ultimately loaded to 660Kn depending on ground conditions. GP Structural have the experience to design a system specific to the clients requirements.


The Advantages of Screwpile technology:

 

  • Rapid installation with standard equipment
  • Instant loading - no curing time
  • No earth to remove/no concrete to install
  • No vibration
  • Minimal site disturbance
  • Competitively priced
  • Proven technology
  • Can be removed if required
  • Environmentally friendly
  • Can be installed in low headroom conditions
  • Effective in compression and tension
  • Can be used for jacking
  • For remedial work they are less invasive
  • Effective in tension or compression
  • No heavy equipment required
  • Can be used for jacking

 

HELICAL PULLDOWN® Micropile

 

Higher load capacities than ever now are achievable by the patented HELICAL PULLDOWN® Micropile technology. It continues to overcome obstacles to traditional foundation methods for a growing number of applications.

 

These products serve heavy anchoring markets with tension loads of 350Kn to 1000Kn and compression loads of 100Kn to 2000Kn.

 

What is a HELICAL PULLDOWN® Micropile?


The HELICAL PULLDOWN Micropile is a system for constructing a grout column around the shaft of a standard Helical Pier Foundation Systems pile.


To begin the process, a screw anchor is placed into the soil by applying torque to the shaft. The helical shape of the bearing plates creates a tremendous pulling force that keeps the anchor advancing downward into the soil.

 

After the lead section with the helical plates penetrates the soil, a Lead Displacement Plate and Extension are bolted onto the shaft. Resuming torque on the assembled shaft advances the helical plates and pulls the displacement plate downward, forcing soil outward to create a cylindrical void around the shaft.

 

From a reservoir at the surface, a flowable grout immediately fills this void, surrounding and encapsulating the shaft.

 

Additional extensions and displacement plates are added until the helical bearing plates reach competent load-bearing soil. This displacement pile system does not require removing spoils from the site.

 

Benefits of this system include:


Resistance to buckling in weak surface soils
Stiffer pile (deflects less at a particular load)
Additional corrosion protection in aggressive soils

 

 

 

Placed as composite steel and concrete pilings they have advantages of:


No vibration to adjacent buildings
All components can be individually designed
Pre-engineered system
Dedicated equipment NOT required
Predictable and reliable capacities
Cost effectiveness (especially viewed as pounds per completed job)

 

 

To watch a video of a pile installation please click on the picture below