Deer Isle Bridge

44.293323 - 68.68927Koordinaten: 44 ° 17 ' 36 "N, 68 ° 41' 21.4 " W

F1

Eggemoggin Reach

Deer Isle Bridge ( officially: Deer Isle- Sedgwick Bridge ) is a road bridge that crosses State Road SR 15 from Sedgwick, Hancock County, Maine over the Eggemoggin Reach called waterway to the island of Little Deer Isle and across a causeway to the immediately adjacent Deer Isle. The bridge is the only connection of the islands with the mainland.

Description

The suspension bridge makes a very slight impression. Over the two slender pylons extend two comparatively thin supporting cable, carrying a very flat, sloping towards the middle bridge deck, refer to the two narrow lanes of the road space.

The ramp bridges including the total 763 m long suspension bridge has a span of 329 m and a clear height of 26 m above MHWS ( Mean High Water Spring ). The two-lane road on the bridge is 6.60 m wide. The 64 m high steel pylons carry two support cables, each consisting of 19 parallel lying beaten ropes. On the support cables, not only vertical hangers are attached, which carry the bridge deck, but several stay cables in both the longitudinal direction and some diagonally across the road carrier. In addition, there are six cross-connections between the supporting cables. The road carrier 's only a 2 m high plate girder construction. 1993 windproof panels were mounted along the outer edges.

History

The construction of the Deer Isle Bridge should begin in the early 1930s, but failed again and again to no or insufficient budgets. The staff responsible for the planning engineering firm Robinson & Steinman had to change his plans several times to reflect the low financial framework. Thus, for example, selected a 6.5% rising road to reach the one hand, the required clearance height, but on the other hand to hold the ramp bridges as short as possible. The lightweight roadway deck enabled ready pylons and thinner suspension cable. Shortly after the start of construction experienced David B. Steinman at his newly completed Thousand Islands Bridge vibrations caused by the wind. As the Deer Isle Bridge with not yet completely finished roadway showed similar oscillations, he installed in her the same system of cable-stays and stiffeners. Both bridges were therefore crucial for Steinman's discovery that the universally acknowledged Deflektionstheorie the aerodynamic effects of the wind did not consider in its then form. Therefore, he knew the built from 1954 to 1957 and as his life's work respected Mackinac Bridge with extremely deep and stiff -makers from wind-permeable truss structures.