緬因州第一座斜拉橋的新創(chuàng)新(編輯修改稿)
2024-07-24 05:55 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 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 THE PYLONS WERE CAST TO THEIR FULL HEIGHT OF 420’. THE TOP OF THE WESTERN PYLON HOUSES A THREE STORY GLASS PUBLIC OBSERVATORY WHICH IS ACCESSED BY AN ELEVATOR THAT RUNS UP THROUGH THE CORE OF THE PYLON.As previously mentioned, the Penobscot Narrows Bridge also includes the use of a cablestay cradle system (. Patent No. 6,880,193) designed by FIGG, the engineer of record for the project。 it is the second such installation. The cradle system allows for the use of continuous strands from bridge deck to bridge deck, carrying each stay through a stainless steel sleeve in the cradle assembly. The individual sleeves increase durability by eliminating the potential for strandtostrand contact. The cradl
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