Combined cable-girder anchoring structure of pre-stressed concrete cable-stayed bridge top

Abstract

A combined cable-girder anchoring structure of the pre-stressed concrete cable-stayed bridge top aims to directly transmit the cable force of a cable-stayed cable to the center of a web so as to remove the transverse eccentric bending moment of the cable force on the web. The combined cable-girder anchoring structure comprises a box girder and a cable-stayed cable (40) with one end anchored on the box girder. Post-cast concrete anchor blocks (20) are arranged at the top of webs (10) of the girder box at the corresponding positions of the girder sections, pre-stressed steel beams (30) are pre-buried in the webs (10) and the post-cast concrete anchor blocks (20), and the pre-stressed steel beams (30) connect the webs (10) and the post-cast concrete anchor blocks (20) after one ends of the steel beams are tensioned at one ends of the post-cast concrete anchor blocks (20) to form a stressed whole body. Combined anchor bearing plates are fixedly pre-buried in the post-cast concrete anchor blocks (20), and one end of the cable-stayed cable (40) is anchored on the combined anchor bearing plates.

Description

technical field [0001] The invention belongs to the technical field of structural engineering, and in particular relates to a key structure applied to a prestressed concrete cable-stayed bridge cable girder anchoring form as a beam top combined anchor block. Background technique [0002] Prestressed concrete cable-stayed bridges, especially low-tower cable-stayed bridges with a span of 100-300m, have received more and more attention in domestic railway bridges in recent years due to their superior economy, reasonable structure, and good aesthetic features , and set off a construction boom of low-tower cable-stayed bridges. The main forms of anchorage between stay cables and concrete girders include roof anchorage, box anchorage, inclined diaphragm anchorage, beam body anchorage on both sides, and beam bottom anchorage. Most of the anchorage forms of bridge cable girders are anchored on both sides of the beam body. However, for long-span cable-stayed bridges, due to the lar...

AI Technical Summary

Problems solved by technology

However, for long-span cable-stayed bridges, due to the large force of the cable-stayed cables, there is a certain eccentricity between the anchor points on both sides of the girder body and the web of the main girder, which makes the stress on the anchorage position extremely complicated. Cracks often occur at the location, and are not easy to be found during the operation stage, which brings hidden dangers to the safety of bridge operation

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