Stiver is proudly supporting the Ashbridge’s Bay Treatment Plant Outfall. This $300 million project for the City of Toronto will replace the current outfall tunnel, which is at the end of its service life. It is set to be the largest wastewater outfall in Canada. The project includes a 16-meter diameter shaft by 85-meter deep, a 3.5-kilometer TBM excavated tunnel that has a 7-meter ID and precast concrete segmental lining. We are providing riprap placement plans for the riser sections on the lakebed. These cages will be placed at the bottom of Lake Ontario and will be guided in place by divers. The riprap baskets will be installed around each of the fifty – 1-meter diameter risers that extend from the tunnel to the lakebed. Learn more about this project in Tunnel Business Magazine: http://bit.ly/tbm-stiver-1-2022
Stiver Engineering provided a design for three piers (Robert’s Point Park, Charlie’s Pasture, and Brundrett Memorial) in Port Aransas, Texas, using concrete reinforced with GFRP bars. The design consisted of the decking panels, beams, an abutment, and pier caps for the three piers. Stiver also provided a loading analysis for the support piles.
The 341st Training Squadron, located in San Antonio, Texas, provides trained military working dogs and handlers for the Department of Defense, as well as other government agencies and allies. The squadron aims to be a world leader in procurement, training, veterinary care and distribution of military working dogs and their handlers. As part of that goal, the squadron commissioned the construction of new housing structures to provide world-class facilities for the animals.
Stiver Engineering provided structural engineering services for the design of the foundations, structural steel and precast kennels for the nine war dog housing buildings.
The Integrated Pipeline is a $48.5 million joint water supply project between Dallas Water Utilities and Tarrant Regional Water District. It involves building 150 miles of pipeline to transport up to 350 million gallons water daily from three East Texas Reservoirs into the Metroplex to increase reliable water access. Crews are installing 4,400 linear feet of pipe using an open face tunnel boring machine with hydraulic jacks and concrete segmental lining. The project recently reached a new milestone when the new tunnel under Trinity River was completed. Workers are now beginning to add 50‐foot sections of 108‐inch diameter steel pipe.
Stiver Engineering performed full design work for the IPL tunnel. Our work included several trench safety plan designs, pipe buoyancy and support calculations, shoring design, a design for a CMU bulkhead, and an alternative design using steel plates and members for grouting abandoned tunnel. We also created a plan and profile drawing set for a new tunnel profile including new geotechnical data, as well as analysis and design for increasing the depth of an existing liner plate and ring beam shaft, among other services.
The design/build project scope included construction of approximately 3,802 linear feet of 108‐inch water line including 2,614 linear feet of tunnel under the Trinity River and the remainder in deep open cut segments along the proposed alignment of Section 17. Other aspects include tunnel launch and retrieval portals/shafts, deep open cut approach ramps with temporary shoring at approximately 12:1 slope, pipe laying within approach ramps and tunnel initial support, pipe encasement with flowable fill and reinforced concrete, tunnel grouting, a 15.6‐foot diameter custom designed tunnel boring machine, and precast segmental tunnel lining.
Due to a number of issues, there was a 1.1-mile gap in the Trail at Lady Bird Lake in Austin, Texas. Along this gap, visitors had to divert onto the narrow sidewalk and travel along busy Riverside Drive, crossing six lanes of I-35 access roads to travel east or west and use the south side of the trail. There are currently 3,000 to 15,000 people using this trail every day of the year. The client retained Stiver Engineering provided structural design through design review services for the construction of each of the boardwalk precast sections.
Stiver Engineering reviewed the design of more than 2,300 different shaped precast panels that were required to complete the trail. This process included the analysis of the reinforced concrete panels for lifting, transporting, and installation.