Menard designed a solution of Controlled Modulus Columns (CMC) rigid inclusions allowing the construction of conventional pad footings with an enhanced allowable bearing pressure of 350 kPa. The final detailed design comprised more than 600 CMC of diameter 320 mm to be embedded 0.5 m into the dense sand (CMC depth about 2 to 3 m depending on the variations of the embedment layer).
Due to the specific site constraints (limited overhead), Menard used a specially-designed equipment consisting of a multipurpose mast mounted on a excavator. This allowed the site team to complete the CMC installation in less than 2 weeks, the slab being cut at the location of the new pad footings in advance of our works by the Main Contractor. Specific ventilation measures were also provided to ensure the safety of the operatives in such a confined space, whilst rubber mats were used to protect the existing slab.
The works have been verified through a thorough quality control, comprising plate load tests on isolated CMC, compressive strength tests on concrete samples and drilling/concreting logs from the rig computers.