緬因州第一座斜拉橋的新創(chuàng)新(文件)
【正文】 nnovativematerial and will help further increase durability as future bridges will be designed utilizing this technology.FIGURE 4A LARGE PLAZA GREETS VISITORS TO THE WORLD’S TALLEST PUBLIC BRIDGE OBSERVATORY ENTRANCE, ALONG THE BANKS OF THE PENOBSCOT RIVER. THE ENTRANCE IS FRAMED IN GRANITE, IN CONCERT WITH THE BRIDGE AESTHETIC THEME OF GRANITE. DETAILS REFLECT ON THE ADJACENT HISTORIC FORT KNOX. AN ELEVATOR TAKES VISITORS TO THE OBSERVATORY AT THE TOP OF THE PYLON.The proactive and pioneering approaches encouraged by the Maine Department of Transportation have advanced standards for future cablestayed bridge designs. There will be opportunities to analyze and evaluate the monitoring records from the stay system, which will result in continued advancements in understanding cablestay bridge performance and enhanced long term durability. The Penobscot Narrows Bridge amp。Structures 2008: Crossing Borders 169。 OBSERVATORY SIDEBYSIDE OVER THE PENOBSCOT RIVER, LINKING WALDO AND HANCOCK COUNTIES IN MAINE. THE NEW BRIDGE OPENED TO TRAFFIC ON DECEMBER 30, 2006, JUST 42 MONTHS AFTER THE EMERGENCY REPLACMENT NEED WAS IDENTIFIED.In order to speed the process, Maine undertook the replacement in an innovative ownerfacilitated design build process and ground was broken in December of 2003 for the new cablestayed bridge, a first for Maine. A key element in the design of the new castinplace concrete segmental bridge is the considerable attention and effort invested to provide a durable and easy to maintain structure with a planned service life exceeding 100 years. The bridge is the first to utilize a unique bination of features designed specifically to protect the bridge and only the second to benefit from a pioneering cradle system, developed and patented by the bridge’s designer.FIGURE 2ADJACENT CRADLES POSITIONED IN THE UPPER PYLON ALONG WITH FORMWORK, AS THE JUMP FORMS ARE BEING PREPARED TO MOVE UP AND CAST THE NEXT SECTION. THE CRADLES ARE FABRICATED, DELIVERED TO THE SITE, POSITIONED AND SURVEYED IN POSITION IN THE FRAMEWORK, THEN LIFTED INTO PLACE AND THE ENTIRE ASSEMBLY SURVEYED FOR CORRECT POSITIONING PRIOR TO CA
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