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 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 part of the ongoing Northeast Water Purification Plant Expansion project in Houston, Stiver Engineering was asked to provide a pulley system to pick up and place 108-inch-diameter pipe sections which weighed more than 20,000 pounds. An I-beam frame was provided to help with the lifting process. Finite element analysis was performed to size the beam and connections. An anchorage design for the frame was also provided using three alternatives that best fit the client’s needs. The frame was designed so the client could easily assemble/disassemble it as necessary.

Stiver Engineering provided liner plate tunnel and bore pit design (launch and receiving) for 10 tunnel crossings as part of this integrated pipeline project. We also provided a trench safety design for pipeline installation, calculations for required jacking loads for carrier pipe in tunnels, and a grouting plan that accounted for pipe buoyancy calculations. This $21 million project for the Tarrant Regional Water District included 2,000 linear feet of 9-foot, 5-inch excavated diameter tunnel in 10 different tunnels crossing Texas Department of Transportation roads, each with launch and receiving shafts (20 shafts).

The city of Houston replaced a 42-inch diameter water line that stretched from West Belfort Avenue to Bissonnet Street along Braes Forest Drive. Stiver Engineering provided steel casing and thrust block designs for the installation of the water line. Calculations were provided for a total of 14 tunnels that varied in depth and length. The casing runs were used to determine the jacking loads that were going to be transferred to the thrust blocks.