The MAGNUM MP1600-3 Concentric Lift Cap is designed for use with steel push piers jacked directly below the footing or load bearing wall for all types of foundation repairs. The cap has an 8″ x 8″ x 1/2″ bearing plate for a total of 64 in2 of bearing area. Rather than costly and less stable multiple threadbars, the MHC1600-3 cap uses the same 3-1/8″ collar lock-off technology as other Magnum push piering systems. Lockoff using one, two or three 3/4″ ASTM A490 high strength bolts. The advantage of this system over others is in its simplicity and strength. More stable and easier to use, the MP1600-3 will provide long l asting support at an economic price.
Excavate minimum 30 inch deep narrow OSHA safe trench under foundation at designated pile location. Install steel push pier under center of footing pad or grade beam using hydraulic jack with minimum 6″ stroke, two 6″
shim pipes, and 18″ push pier sections. Perform a pile load test upon pile completion using the installation ram. Hold pressure for a minimum 15 minutes with less than 1/32″ movement. Cut-off pile at least 13.5 inches
from bottom of footing/grade beam. Slide collar tube over pile. Position concentric lifting frame over pile and bolt to collar tube. Place thin layer of high strength, fast-setting, non-shrink grout over top plate. Using ram,
force top plate upward against bottom of foundation and apply small setting pressure (typically 500 psi). Allow grout to set a minimum of 30 minutes. Lift and re-level structure as desired. Drill and lock-off collar tube by installing one, two, or three 3/4″ bolts as required for design load. Remove jack
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U.S. Patents 6,058,662 and 5,234,287; Other Patents Pending.