{"id":4423,"date":"2024-06-07T18:04:07","date_gmt":"2024-06-07T16:04:07","guid":{"rendered":"https:\/\/www.hebetec.com\/?post_type=case-studies&p=4423"},"modified":"2024-06-07T18:48:58","modified_gmt":"2024-06-07T16:48:58","slug":"oakland-bay-bridge","status":"publish","type":"case-studies","link":"https:\/\/www.hebetec.com\/en\/references\/oakland-bay-bridge\/","title":{"rendered":"Oakland Bay Bridge Demolition"},"content":{"rendered":"
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Design<\/h5>\n

Equipment<\/h4>\n

Four HA-600 strand jacks with a capacity of 6,000 kN each were used to lower the bridge’s steel trusses, along with four additional H-600 strand jacks for necessary tie-back bracing. These semi-automatic strand jacks, featuring systems to control clamping mechanisms, were placed at the four main support points of each steel truss.<\/p>\n

A central programmable logic controller (PLC) visualized cylinder strokes, hydraulic pressures, and lowering distances, ensuring precise control. The PLC control system enabled centralized operation, with data connections between the east and west sides of the bridge. Four laser devices with reflectors mounted on the bridge beams ensured precise distance measurements. This system reduced the original timeframe from 14 to 8 months. Removable platforms and automated systems minimized environmental impact and streamlined the lowering process.<\/p>\n

Challenges<\/h4>\n

The steel trusses were part of the bridge’s rigid, riveted construction. Adverse space conditions, working above open water, and restricted erection appliances influenced the execution plan. Accurate load management and structural integrity were critical due to the rigid nature of the riveted trusses.<\/p>\n

Process<\/h4>\n

Before lowering, equipment was preassembled on a staging area, and strand jacks and guides were mounted on removable platforms for easy repositioning. The steel trusses were lowered in five cycles onto barges using the strand jacks. Each steel truss was precisely aligned with laser and steel tape measurements. The process was completed in one day per truss, with an additional day for alignment and transfer onto barges.<\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n

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