Leonard P. Zakim Bunker Hill Memorial Bridge
42.36875 - 71.063194444444Koordinaten: 42 ° 22 ' 7.5 "N, 71 ° 3' 47.5 " W
F1
Interstate 93, U.S. Highway 1
The Leonard P. Zakim Bunker Hill Memorial Bridge in Boston connects the underground city highway with Interstate 93 and U.S. Highway 1 The building was built as part of major urban development project, the Big Dig in the years 1997 to 2002. The bridge spans a total of ten lanes of the Charles River and is 56 m with the widest cable-stayed bridge in the world. The structural system of the striking due to a new type of cable guide building was built under the advice of the Swiss Professor Christian Menn. The bridge is named after the Boston Leonard P. Zakim civil rights activists and the Battle of Bunker Hill.
Construction
The main bridge has five openings with spans of 39.6 m and 34.1 m in the southern side panels, 227 m from the main field and 76.2 m and 51.8 m in the northern side openings. The length between both sides of expansion joints is 430 m.
The pylons of the cable-stayed bridge zweihüftigen have a λ - shape and are located centrally over the eight lanes of I 93. Two additional side lane of a ramp located on one side, to the east next to the pylons, which are a total of 98.4 meters high and made of reinforced concrete.
The bridge has an unusual cable guide in the fan system. Due to the eccentric arrangement, two lanes cable layers are present in the primary port, which are anchored at the edge of the bridge girder in a wire spacing of 6.0 m. In contrast, only one anchored in the middle rope bridge support level is present in the two marginal fields. In addition, the ropes are anchored not only in the vertical pylon top, but also in the inclined pylon stems.
The track support is arranged at right angles to the main field as light-weight construction with steel ropes to anchor the longitudinal members and to the form 3.0 meter high steel cross-members at a distance of 6.0 m. The bridge deck is made of reinforced concrete. In contrast, the side panels have a heavy prestressed concrete superstructure.