Stiver Engineering designed a 204 ft. x 66 ft. x 24 ft deep multi-phase shoring system using piles, wales, and knee bracing. Implemented access ramps and phases, this shoring design allowed the contractor to complete the project despite the excavation being adjacent to large storage tanks.

The Joes Creek Interceptor project in Dallas involves 8,370 linear feet of 60-inch excavated diameter tunnel that will house 36-inch HOBAS carrier pipe. There are 20 shafts (ranging from 21 to 48 vertical feet in depth), and ground conditions include sand, sand with gravel, sandstone, sandy clay, shaley clay, and shale (Eagle Ford). Stiver Engineering provided steel casing pipe calculations for 8 runs. We also created designs for various sizes of shoring pits using sheet piling and wale sets, as well as designs for a 32-foot-diameter liner plate and ring beam shaft at various locations and TBM face pressure calculations.

The Chelford City Diversion project will consolidate and upgrade public works facilities in part of Houston through the installation of sanitary sewer lines, manholes, reinforced concrete pavement, and curbs. As part of the project, Stiver Engineering redesigned a concrete vault at the junction of a 60-inch sanitary sewer pipe and a 108-inch sanitary sewer pipe. The bottom of the 22-foot-tall concrete vault was 70 feet below the existing ground.

The city of Conroe, Texas, is building a $60 million Central Wastewater Treatment Plant that will be designed to handle up to 12 million gallons per day. Stiver Engineering provided design services for a 38-foot ID Lift Station for the new Central Wastewater Treatment Plant in Conroe, Texas. Our work included sinking calculations and the finite element analysis of the exterior walls and the caisson bottom slab.

Using Danby liner and grout, Stiver Engineering provided a pipe rehabilitation design for a 93-inch arch pipe at a wastewater treatment plant in Cincinnati, Ohio. The existing pipe section along with the Danby liner and grout allowed us to create a composite section. The composite section was designed so the contractor could provide a clear span over existing utilities. Stiver also designed bulkheads inside the existing 93-inch arch pipe to provide access for the pipe’s rehabilitation.