All-ground-anchor type single-tower double-span cable-stayed bridge structure and construction method thereof

Abstract

An all-ground-anchor type single-tower double-span cable-stayed bridge system comprises a main beam, a stay cable, a main tower and an anchor. The main beam is composed of a side span main beam body and a main span main beam body. The length of the side span main beam body is far smaller than that of the main span main beam body, and the side span main beam body and the main span main beam body are asymmetrically distributed. The side span main beam body is supported by a support arranged on a side span buttress main tower lower beam and fixedly connected with the main span main beam body and the anchor. The stay cable comprises a main span stay cable body and a side span stay cable body. The main span stay cable body supports the main span main beam body. The upper end of the side span stay cable body is anchored to the main tower and corresponds to the main span stay cable body in position. The lower end of the side span stay cable body is anchored to the anchor. The main tower provides anchorage for the main span stay cable body and the side span stay cable body and meanwhile transmits the vertical force of the side span stay cable body to a foundation through a main tower bearing table and a main tower foundation. The anchor provides anchorage for the whole side span stay cable body and meanwhile balances the horizontal force transmitted by the side span main beam body. The invention further discloses a construction method of the cable-stayed bridge system. The cable-stayed bridge system is high in adaptability, reasonable in structural system, easy and convenient to construct, short in construction period, low in manufacturing cost and small in safety risk in the construction period.

Description

technical field [0001] The invention belongs to the field of bridge engineering, and relates to a cable-stayed bridge system and a construction method thereof, in particular to a fully ground-anchored single-tower double-span cable-stayed bridge system with small side spans and a construction method thereof. Background technique [0002] The conventional single-tower cable-stayed bridge is a self-anchored structure system, called self-anchored single-tower cable-stayed bridge, such as figure 1 Shown: The main tower is located near the center, the main span is used to cross valleys and rivers, and the side spans also have the function of crossing. The length of the side spans is generally 1.0 to 0.8 times that of the main span (the side-to-middle span ratio), and the cables are arranged nearly symmetrically on the main span and the side spans to form a self-anchoring system; [0003] In order to enhance the rigidity of the whole bridge, one or two auxiliary piers can be inst...

AI Technical Summary

Problems solved by technology

[0011] Ground-anchored single-span cable-stayed bridges can cancel side spans, but are not suitable for construction when geological conditions are poor

[0012] (2) During the construction period, the structure itself has poor stability and high safety risks;

[0014] For ground-anchored single-span cable-stayed bridges with inclined pylons, the main tower needs to be supported by brackets during the construction period, which has a certain risk of overturning. Before the overall bridge construction is completed, it will be in an unstable state;

[0015] (3) The construction period is difficult;

[0017] Ground-anchored inclined-tower single-span cable-stayed bridges are difficult to construct due to the inclination of the main tower, and the structure of the main cable anchorage area on the tower is complex, making construction difficult

Images