WALLER CREEK TUNNEL PROJECT WALLER BEACH SITE IMPROVEMENTS OUTLET FACILITY - CUTOFF WALL
ACT was contracted by Zachry to install a reinforced concrete diaphragm wall around the perimeter of a storm water shaft and tunnel outlet structure. The wall will provide support for excavation works and act as a seepage barrier against water infiltration.
ACT used our Bauer CBC 32 equipped with a BC 32 trench cutter to create the excavation required to form the cutoff wall. Overlapping 39 inch wide (1 meter) panels were cut to create the wall. Primary and secondary panels were 9 feet long (2.8 meters) and overlapped 6 inches (150 mm) at each end forming a continuous wall. After the panels were cut and prior to concreting, rebar cages were lowered into each panel.
592 lineal feet (180 meters) of the wall was constructed to a depth of 29 feet (8.8 meters), while 141 lineal feet (43 m) of the wall was constructed to a depth of 62 feet (19 m). Reinforced concrete guide walls were installed to facilitate initial alignment for the cutter equipment. Onboard computer control enabled the wall to be maintained within alignment tolerances to the final depth.