Kendall Culvert

Need: Improvement of the Utility Infrastructure and construction of a new Duct Bank system for this project required deep excavations through busy city streets. Semper was contracted on this project for to design, furnish, and install a temporary Support of Excavation system to allow the utility contractor to complete their scope of work. The purpose of temporary support of excavation system is to minimize the excavation area, ensure that system is capable of limiting ground movements to avoid damage to neighboring utilities or structures as well as maintain stability and operation of the surrounding city streets and sidewalks adjacent to the excavations.

Outcome: Due to the scale and location of the project, Semper constructed several SOE systems in various locations of the project, every system installed was constructed around both known as well as unknown utilities found during the excavation that intersected the trench at all different angles and elevations which were also temporarily supported throughout the scope of the utility work. With excavations ranging in cut depth from 14 to 25 feet, Semper utilized various layouts combinations of Soldier Pile and Lagging Walls to accommodate for the depth of the cut as well as accommodate the existing utilities below grade. The soldier piles are driven prior to the excavation beginning, and the wood lagging is added as the excavation descends. Wide flange beams distribute the loads of the horizontal struts to the walls of the soldier pile. The struts’ capacities are determined by buckling considerations because they are compression members. Lateral supports reduce the effective lengths of the struts while increasing their capacities.