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Precast concrete takes Baltimore utility over water
| 题名： | Precast concrete takes Baltimore utility over water |
| 正文语种： | eng |
| 作者： | William Atkinson |
| 摘要： | Baltimore Gas and Electric (BGE), a Maryland-based electric utility, owns and operates a high-voltage transmission grid. One important component of that grid is the Francis Scott Key Bridge in Baltimore, Md., where underwater lines were installed in the 1970s about 10 to 15 ft (3 to 5 m) below the riverbed. The 2.5 mi (4 km) long Key Bridge portion of the line has been in service for more than 50 years and displayed signs of deterioration. Because this section is critical for the resilience of the grid system, BGE planned to replace it. Although various alternatives were analyzed, taking into consideration cost, design complexity, environmental impact, stakeholder preferences, permitting complications, and interruption of shipping, the project team selected overhead lines incorporating tall towers in the river. Compared with the underwater option, which would have required jet plowing submarine cable through the river bottom, the overhead option was more environmentally sound. In addition, installing underground cables would have cost about twice as much as the overhead project. |
| 出版年： | 2023 |
| 期刊名称： | PCI Journal |
| 卷： | 68 |
| 期： | 6 |
| 页码： | 19-19 |
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