OWNER:
Easy Access Self-Storage Stockport
ENGINEER:
Brennan Consult
GENERAL CONTRACTOR:
Williams Build and Design Limited
MAIN FIGURES:
388 Controlled Modulus Columns
Project Details
The Structural Engineer initially approached Menard for a Ground Improvement solution for the proposed extension of a self-storage facility. The proposed extension was to be carried out on 2 elevations of the structure and split over 2 levels. The existing structure was vacant, and the cladding had been removed to reveal the steel frame, making it easier to work up to the existing building.
Ground Conditions
The ground conditions consisted of very loose to loose sandy gravels with evidence of landfill materials, beneath this were competent high-strength silty clays. At the request of Menard, additional site investigation in the form of Cone Penetration Tests (CPT) was undertaken to map out the extent of the loose sandy gravels fully.
Solution
The initial investigation revealed that the ground conditions were suitable for a CMC solution and the additional investigation with CPTs helped to refine the CMC design. Just under 400 CMCs were installed to depths of between c.3.0 m to 10.0 m varying inline with the depth of the very loose to loose sandy gravels. The CMCs were designed to reduce the residual settlements to 25 mm, with relative differential settlements lower than 1/500, and enhance the allowable bearing capacity to 200 kPa beneath the footings and 50 kPa beneath the floor slab.
