緬因州第一座斜拉橋的新創(chuàng)新-在線瀏覽
2024-08-07 05:55本頁面
【正文】 as a tool for the Department to easily monitor the status of the system and take corrective action, if necessary. The annular space between the cable stay strand and the cradle sleeves allows gas to flow freely through the stay system in an isolated environment.To the best of our knowledge, the stay cable gas protection system utilized in the new Penobscot Narrows Bridge is a world first. This unique system provides two additional layers of protection by pletely surrounding the stays with an inert gas, and through automatic andcontinual monitoring of the gas pressure level. Monitoring allows the Maine Department of Transportation realtime knowledge of any potential promise in the system. There are a total of four nested levels of protection, providing redundancy:? Epoxy coating on the stay strands? Outer layer of HDPE sheathing around the stays? System filled with nitrogen gas to purge potential corrosives? Sealed system with monitoring equipmentThis proactive approach allows maintenance crews to identify and address potential problems at an early stage, with minimal monitoring effort.An additional monitoring tool for the Penobscot Narrows Bridge is a series of force monitoring systems on each stay. Dywidag Systems International provided the force monitoring systems, which can accurately determine the force within 1% using a portable field laptop system is very rugged, requires no maintenance, has no moving parts and will provide monitoring throughout the projected service life of the bridge, allowing Department employees ease in regularly monitoring the forces in the cable as part of their inspection procedures, without the need for liftoff equipment or the utilization of special expensive techniques such as vibration measurements. With this monitoring system, the force in the cable is obtained in minutes without any interference with the traffic on the bridge. The leads from the sensors are in a gas tight box located inside the box girder just under the cable anchorage, maintaining the integrity of the sealed system of the gas monitoring system.FIGURE 3CONSTRUCTION TOOK PLACE IN THREE DIRECTIONS ON BOTH PYLONS – TWO CANTILEVERS EXTENDING FROM THE PYLON AS
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