Stiver Engineering provided the horizontal directional drilling alignment and pulling calculations for a 42’’ inch diameter force main crossing beneath the Houston Ship Channel adjacent to the 69th street wastewater treatment plant. The purpose of the HDD installation was to replace the existing Hedrick Force Main Aerial Crossing. The HDD was approximately 1,000 ft. and was installed to a depth of 100 ft.

Stiver Engineering provided the contractor with an alternate tunneling method for a 6-inch diameter force main.  The alternate design consisted of a horizontal directional drill (HDD) that was 21 ft. beneath an existing railroad.  The pull forces and pipe stresses were analyzed and a profile was delivered to the contractor for construction.

The sewer system in the city of Las Vegas was disjointed and inefficient. Connections to the main sewer line were sporadic, and relief sewers could not adequately intercept flow. To support the City’s waste management, Stiver Engineering provided key design services for the Paradise Whitney Interceptor in Las Vegas.

The project consisted of a 32,000-foot gravity sewer that conveys flow from the Enterprise Water Resource Center and existing interceptors. Over 26,000 lf of trenchless construction were installed, making it one of the most significant trenchless new installation programs in terms of footage undertaken in the United States. The project received an honorable mention for trenches project of the year by Trench Technology.

Stiver Engineering provided a trench excavation safety plan for the open cut sections including fall restraint systems in addition to the trench shoring, bore pits for the tunnel operations, tunnel design, steel casing design, tunnel grouting design and tunnel settlement analysis.

Stiver Engineering provided shoring design services for a 72-inch water line project from Emancipation Avenue to Tuam Street on Clay Street in Houston, Texas. Stiver’s work included secant pile shaft design for the launch and receiving shafts. The shafts are 34 ft ID and 80 ft deep. We also created designs for the breakout structure for the Akkerman TBM.

Stiver Engineering provided key design services for the Northeast Transmission Line (NETL) project in Houston. The NETL will transmit 365 million gallons of water a day from the Northeast Water Purification Plant through a 108-inch steel waterline to approximately 900,000 homes in Harris County. Stiver provided a shoring design using soldier piles, wale sets, and steel plate and timber lagging. We also developed a design for a temporary bulkhead to grout fill the annulus of the waterline pipe inside the casing pipe and a cradle design to support the existing 84-inch diameter waterline.

Photo Credit: LAN