Suspender tensioning method of double-tower single-span self-anchored suspension bridge with high-cross dip and spatial cable

Abstract

The invention discloses a suspender tensioning method of a double-tower single-span self-anchored suspension bridge with high-cross dip and spatial cable, which comprises the following steps: expanding a main cable to a certain degree by using temporary slings; tensioning permanent slings nearby the temporary slings to a preset tonnage or an unstressed sling length at the time forming a bridge in the process of tensioning the permanent slings; and stopping a part of the temporary slings or all temporary slings working by using the advantage that the allowable cable tension of the permanent slings are much greater than that of the temporary slings, thus ensuring that the cable tension of the temporary slings does not exceed the specified value. In the process, if the derivation of a tower top exceeds the limit, the main cable saddles are subject to incremental launching. In the suspender tensioning method of the double-tower single-span self-anchored suspension bridge with high-cross dip and spatial cable, the larger control cable tension of the permanent slings nearby the temporary slings is taken full advantage. The suspender tensioning method of the double-tower single-span self-anchored suspension bridge with high-cross dip and spatial cable has the following advantages of being in no need of regulating the cable tension of the temporary slings actively in the process of system conversion, thus ensuring safety in the construction process, and quickness and convenience, short construction period, and lower cost.

Description

technical field [0001] The invention relates to a construction method of a suspension bridge, in particular to a method for tensioning suspension cables of a double-tower single-span large transverse inclination space main cable self-anchored suspension bridge. Background technique [0002] The self-anchored suspension bridge does not need to build bulky anchorages, has low requirements on geological conditions, flexible span layout, and good landscape effects. As for the space main cable self-anchored suspension bridge, since the suspension cable of the transverse bridge tilts the main cable to a certain extent, both the suspension cable and the main cable have a direction-retaining force, so it has strong wind resistance and excellent dynamic performance. more attention. So far, there are more than ten space main cable self-anchored suspension bridges that have been built or are under construction, such as South Korea Yeongjong Bridge, San Francisco New Oakland Bay Bridge...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that temporary cable loosening is difficult, unsafe, time-consuming and affects the construction period in the system conversion of the main cable self-anchored suspension bridge with double towers, single-span and large transverse inclination angle in space with parallel steel wires, the present invention provides a Suspension cable tensioning method for self-anchored suspension bridge with main cables in self-anchored suspension bridge with double-tower single-span and large lateral inclination angle space with high safety factor and fast and convenient adjustment of temporary cable force during sling tensioning

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