Patent ID: 8695142
Filing Date: 2014-04-15
Classification: E01D

Abstract:
1. A method of constructing a partially earth-anchored cable-stayed bridge using a main-span prestressing unit, the method comprising: (a) installing first and second main towers a predetermined distance apart from each other in an axial direction of the bridge, a first anchorage on a side of a side span outside the first main tower, and a second anchorage on a side of a side span outside the second main tower; (b) connecting first side-span and main-span deck segments, which extend from the first and second main towers toward the side spans and a middle part of a main span, to compression cables connected to the first and second main towers such that the first main-span deck segments are separated in the axial direction of the bridge without interconnection at the main span; (c) connecting tension cables, which extend from the first and second anchorages toward the main span via the first and second main towers, to second and third main-span deck segments, which are additionally connected to the first main-span deck segments connected by the compression cables; (d) installing first and second anchor units on the second and third main-span deck segments; and (e) mounting a prestressing member including a steel stranded cable between the first and second anchor units so as to cause the first and second main-span deck segments separated in the axial direction of the bridge at the main span to be connected in the axial direction of the bridge, and prestressing and anchoring the prestressing member to cause a tensile stress to be applied to the first and second main-span deck segments.