CN104264579A - Steel self-anchored suspension cable-cable-stayed cooperative system bridge - Google Patents

Abstract

The invention discloses a steel self-anchored suspension cable-cable-stayed cooperative system bridge. The steel self-anchored suspension cable-cable-stayed cooperative system bridge comprises a main tower, a side-span bridge pier, a girder, a main cable, a stay cable and a suspender, the girder is supported by the main tower, side-span bridge pier, main cable and stay cable, the middle of the girder is connected with the main cable through the suspender, and the girder is a steel box girder. The steel self-anchored suspension cable-cable-stayed cooperative system bridge solves the problem of large axial force of a girder of a large-span self-anchored suspension cable-cable-stayed cooperative system bridge through using the steel box girder for the self-anchored suspension cable-cable-stayed cooperative system bridge. Because the steel self-anchored suspension cable-cable-stayed cooperative system bridge uses the steel girder as the girder, the weight is light, the spanning ability is strong, and the construction speed is fast.

Description

A self-anchored suspension-cable-stayed cooperative system steel structure bridge

technical field

The invention relates to a bridge, in particular to a self-anchored suspension cable-cable-stayed cooperative system steel structure bridge.

Background technique

Over the past century, great achievements have been made in the development of bridge engineering, among which the system evolution and span breakthrough of cable-bearing bridges are one of the most important achievements. The so-called cable-bearing bridge refers to a bridge with cables (main cables of suspension bridges) or cables (stay cables of cable-stayed bridges) as the main load-bearing components. Cable-bearing bridges have two important characteristics: one is that the main stress-bearing components mainly bear the axial force, and the cables and cables bear the axial tension; The second is that the cable, as the main force-bearing member, is made of high-strength material (generally high-strength steel wire), with high tensile strength and light weight. Therefore, compared with other bridge types, bridges with cable bearing systems are more suitable for the development of long-span bridges. In fact, for bridges with a span range of 200-1500 meters (or even larger), cable-bearing bridges are very competitive, and cable-bearing bridges account for about the total number of bridges in the span range of 200-1500 meters. Currently, the common structural types of cable-bearing bridges mainly include suspension bridges and cable-stayed bridges.

In addition to the suspension bridges and cable-stayed bridges mentioned above, cable-bearing bridges have proposed cable-stayed-suspension cooperative system bridge schemes for many long-span bridge projects abroad in recent years. Many of these are good options. Although my country started relatively late in terms of cable-stayed-cable-suspension cooperative system bridges, with the development of my country's transportation industry, in recent years, many domestic projects have repeatedly proposed suspension-cable-suspension cooperative system bridge schemes, and Guizhou has also built the world's first bridge. A suspension-cable-stayed collaborative system bridge in the modern sense.

Suspension-cable-stayed cooperative system bridge is a new type of cable-bearing bridge, which is composed of several main parts such as stiffening beam, main tower, main cable, cable-stayed cable, suspender, and foundation. When the bridge is completed, the self-weight and external load of the structure are mainly borne by the main cables, stay cables, stiffening beams and main towers. The cable is the main load-bearing member in the structural system, which is a geometrically variable system and bears the action of tension. The cable can not only affect the system balance through its own elastic deformation, but also affect the system balance through the change of its geometric shape, showing the nonlinear mechanical characteristics of large displacement, which is one of the important characteristics of the suspension-cable-stayed cooperative system bridge . The cables of the suspension-cable-stayed cooperative system bridge have a large initial tension under constant load, which provides strong gravity stiffness for the subsequent structure. This is the fundamental reason why the bridge span of the suspension-cable-stayed cooperative system can be continuously increased and the height-span ratio of the stiffened girder can be reduced.

Suspension-cable-stayed cooperative system bridges are generally divided into two types: ground-anchored and self-anchored.

(1) Ground-anchored suspension-cable-stayed cooperative system bridge, as shown in Figure 1a.

The collaborative system bridge needs to pour a huge anchor to transmit the vertical and horizontal components of the main cable to the foundation. In an environment with good foundation conditions, the self-anchored suspension-cable-stayed cooperative system bridge can be given priority.

(2) Self-anchored suspension-cable-stayed cooperative system bridge, as shown in Figure 1b.

In this collaborative system bridge, the main cable is anchored to the end of the stiffened beam. The stiffened beam bears the huge axial pressure from the main cable and stay cables in addition to the bending moment. There is a beam-column effect, and the structure has obvious geometric non-linear features. The vertical component is borne by the counterweight and the pier (the vertical component is transmitted to the pier through the tension and compression support). This system does not require huge anchors, so it has strong advantages in soft soil foundation areas and strong wind areas. .

The self-anchored suspension-cable-stayed cooperative system bridge usually adopts the method of transferring all the weight of the main girder to the main girder and the main tower by the suspender, main cable and stay cable. Due to the self-heaviness of the main girder, the axial force of the main girder will be too large, which will bring the danger of exceeding the ultimate bearing capacity and instability and damage.

Contents of the invention

In order to solve the technical problems in the known technology, the present invention provides a self-anchored suspension cable-cable-stayed cooperative system steel structure bridge, which can reduce the axial force of the main girder, thereby avoiding the overrun and failure of the main girder bearing capacity. risk of damage.

The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a self-anchored suspension cable-cable-stayed cooperative system steel structure bridge, including main tower, side-span pier, main girder, main cable, cable-stayed cables and suspenders, the main girder is supported by the main tower, the side-span piers, the main cables and the stay cables, the middle part of the main girder is connected with the main cables through the suspenders connection, the main girder is a steel structure box girder.

The advantages and positive effects of the present invention are: by applying the steel box girder to the structure of the self-anchored suspension-cable-stayed cooperative system bridge, the main girder of the long-span self-anchored suspension-cable-stayed cooperative system bridge is solved The problem of excessive axial force. And the steel girder is adopted as the main girder in the present invention, the structure has light weight, strong spanning ability and fast construction speed.

Description of drawings

Figure 1a is the structure of ground-anchored suspension cable-cable-stayed cooperation system;

Figure 1b is a self-anchored suspension cable-cable-stayed cooperative system structure;

Fig. 2 is a front view of the present invention.

In the figure: 1. Main tower; 2. Side-span pier; 3. Main girder; 4. Main cable; 5. Stay cable; 6. Suspender.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Fig. 2, a kind of self-anchored suspension cable-cable-stayed cooperative system steel structure bridge, comprises main tower 1, side-span pier 2, main girder 3, main cable 4, stay cable 5 and hanger rod 6, described The main girder 3 is supported by the main tower 1, the side-span pier 2, the main cable 4 and the stay cable 5, and the middle part of the main girder 3 connects with the main cable 4 through the suspender 6. connection, the main girder 3 is a steel structure box girder.

Generally, self-anchored suspension-cable-stayed collaborative system bridges use concrete girders, but this structural system results in too large axial force of the girders, which cannot meet the requirements of large spans. The invention adopts the steel girder as the main girder, which reduces the huge axial force transmitted from the main cable to the main girder and the main tower, and forms a self-anchored steel girder, main cable, boom, stay cable, main tower and other main components. Suspension-cable-stayed cooperative system bridge. The bridge structure can be widely used in various self-anchored suspension cable-cable-stayed cooperative system bridges, which can reduce the axial force of the main girder and increase the construction speed.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, people can also make many forms without departing from the purpose of the present invention and the scope of protection of the claims, and these all belong to the protection scope of the present invention.

Claims (1)

1. self-anchoring type suspension cable-oblique pull co-operative system steel structure bridge, comprise king-tower, end bay bridge pier, girder, main push-towing rope, suspension cable and suspension rod, described girder is supported by described king-tower, described end bay bridge pier, described main push-towing rope and described suspension cable, the middle part of described girder be connected with described main push-towing rope by described suspension rod, it is characterized in that, described girder is steel-structure box girder.