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.
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.
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.
Stiver Engineering provided key services as part of the largest and most complex sanitary sewer improvement project that the San Antonio, Texas Water System (SAWS) has ever undertaken. The project involves replacing a deteriorating, 5-mile-long pipeline, known as the “W-6 Upper Segment” main, that serves approximately 500,000 residents in the San Antonio area. The replacement pipe will be designed to last 100 years.
Stiver’s work included designs for steel casing, bore pit/access shaft, and grouting plans along with a concrete thrust block analysis. Buckling and jacking calculations were provided for the 36-inch casing pipe. Stiver also helped the contractor with a plan to grout fill around the 8-inch and 12-inch PVC carrier pipes inside the 36-inch casing. A custom concrete thrust block was provided to the contractor to help with the installation of the 36-inch casing pipe. Stiver Engineering provided the support/restraint design for the 60-inch and 104-inch diameter Hobas carrier pipes along with the buoyancy calculations and grout pour designs.