Stiver Engineering provided a shoring design for the launch and receiving tunnel shafts, including portal design implementing soldier piles and the shaft design implementing sheet piling and wale sets. Calculations and a finite element analysis (FEA) were performed for a 108-inch diameter tunnel steel casing pipe. Calculations for grout pressure used to fill voids outside the casing pipe were also provided.

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.

Stiver Engineering provided launch shaft, excavator digger shield and thrust block design services for a 108-inch-diameter water line project along city easements from Milner Road to Aldine Westfield Road in Houston, Texas, near the Intercontinental Park area. Two shoring pits, each more than 30 feet deep, were designed with soldier piles, steel plates and timber lagging. Waler beams were used to support the soldier piles. At the launch pit, a jacking frame was designed at the bottom of the pit to resist the thrust from the excavator boring shield system. The jacking frame consisted of three extra waler sets and diagonal bracings connected to a portal support frame using king beams, a header beam and a footer beam.

Stiver Engineering provided sheet pile shoring for the installation of beach vaults for the Big Wave Project in Diego Garcia, British Indian Ocean Territory. The site had hard corals located 13 feet below natural ground, so we created two alternatives for the shoring pit. The first alternative was a cantilever shoring system consisting of 14-foot and 30-foot-long piles with staggered embedment. The second was a braced shoring system designed to accommodate the client’s concern of not being able to embed the sheet piles more than 6 inches into the hard coral. Material was limited on the island, so Stiver proposed a custom wale set consisting of channels and pipes.

Stiver Engineering provided numerous services for capital improvements to a 108- inch-diameter water line running from Aldine Westfield Road to Willis Street in Houston, Texas. We created shoring and portal designs for launch and receiving shafts — some as deep as 31 feet — using sheet pile and soldier piles, wale sets, steel plates, timber lagging, and other methods. Stiver also created trench safety designs for installation, special shoring requirements with trench boxes, steel plates and soldier piles, and steel casing designs.