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bradford watson
Construction : This series of photographs, taken over a five month period, show the installation of 200 drilled piers and grade beams, with a moisture prevention membrane, to support an approximately 40,000 square foot primarily single story structure in the Front Range of Colorado. The Geo-Technical Report for this site called for a minimum of 12-inch clear space between any horizontal structural member and the undisturbed soil to allow for the ground to swell without impacting the structure.
left from the top: 1 Soil with swelling clay during excavation 2 Formwork and reinforcing over drilled piers and void form to accommodate soil movement 3 Drilled pier and grade beam with over-excavation to allow for ground swelling above, from the top: 4 Installation of moisture prevention 5 Placement of hollow core structural plank on grade beam prior to topping the slab with over-excavation soil pile, seen in the distance 6 Consequent slab for low-rise construction ready for the framing of walls
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