Friday, July 9, 2010

Cable-Stayed Bridges - Stonecutters Bridge (4)

A photo of a cable on rollers so it won't get frayed while being dragged across the deck. There must be a blue protective covering around the cable that's removed after it's in place. I  imagine the cable is attached to the superstructure first and then anchored to the tower (because the superstructure is more flexible). The tower was assembled very quickly using a piggyback form system. Cable anchor boxes were attached to the inside of the tower and then the cables were inserted into it and secured. The soil conditions turned out to be different than they had originally assumed, which delayed the project while they built deeper tower foundations. The top of the tower has a stainless steel surface with shear studs. They must have used this surface as a form for pouring the top of the tower. The superstructure segments on the main span are 28 meters long and on the back span they are 18 meters long and made of reinforced concrete instead of steel to balance the bridge during construction (and after).
Creative Commons License
Cable-Stayed Bridges - Stonecutters Bridge (4) by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 United States License.

1 comment:

The Happy Pontist said...

The stainless steel sections near the top are fully composite with the concrete i.e. they act both as formwork and also contribute significantly to the tower's bending strength.