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.

As a part of a terminal and ramp expansion project at the Charlotte Douglas International Airport, Stiver Engineering provided a custom beam and plate lagging shoring design that was greater than 2,500 feet long. The 30-foot and 35-foot steel H-piles for the shoring system were driven prior to construction to avoid conflict with the elevated roadway. Stiver prepared custom access shafts to accommodate the turns in the pipe runs, and a trench shoring design using soldier pile and timber lagging/steel sheeting. Stiver also designed intermediate pits along the trench that required wale set supports along with soldier piles.

Stiver Engineering provided a custom beam and plate shoring design for the ongoing Northeast Water Purification Plant Expansion Project in Houston. The custom design was greater than 250 feet long. The pit was located next to Lake Houston with a live 74-inch diameter pipe that crossed through the shoring and discharged into Lake Houston. The shoring was installed so dual 108-inch water lines could be constructed. Stiver also prepared a custom pipe support frame that the contractor used to support the existing storm drainpipe while the dual water lines were built.