CN104264578A - Steel-concrete combining bridge of self-anchored suspension cable-cable-stayed cooperative system - Google Patents

Abstract

The invention discloses a self-anchored suspension cable-cable-stayed cooperative system steel-concrete composite bridge, which comprises a main tower, a side-span bridge pier, a main girder, a main cable, a stay cable and a suspender. The bridge piers, main cables and stay cables are supported. The main girder is connected by the mid-span main girder in the middle and the side-span main girders on both sides of the mid-span main girder. The middle part of the mid-span main girder connects with the main cable The main girder of the middle span is a steel structure box girder, and the main girder of the side span is a concrete structure box girder. The present invention solves the problem of too large axial force of the main girder of the long-span self-anchored suspension-cable-stayed cooperative system bridge by applying the steel-concrete composite beam to the structure of the self-anchored suspension-cable-stayed cooperative system bridge . And the present invention adopts the steel girder as the main beam of the mid-span, the structure has light weight, strong spanning ability, and fast construction speed; the concrete beam is used as the main beam of the side-span, which can play the role of weight on the one hand, and on the other hand, can be connected with the side-span pier Combined to form a stable anchor span.

Description

A self-anchored suspension-cable-stayed cooperative system steel-concrete composite bridge

technical field

The invention relates to a bridge, in particular to a self-anchored suspension cable-cable-stayed cooperative system steel-concrete composite 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 axial force, and cables and cables bear 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 huge anchors to transfer 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 characteristics. 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-concrete composite bridge, which can reduce the axial force of the main girder, thereby preventing the bearing capacity of the main beam from exceeding the limit and the risk of instability and 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-concrete composite bridge, including main tower, side-span pier, main girder, main cable, Stay cables and suspenders, the main girder is supported by the main tower, the side-span pier, the main cable and the stay cables, the main girder is supported by the mid-span main girder in the middle and the The side span main girders on both sides of the mid-span main girder are connected, the middle part of the mid-span main girder is connected with the main cable through the suspender, and the mid-span main girder is a steel structure box girder. The side span main girder is a concrete box girder.

The advantages and positive effects of the present invention are: by applying the steel-concrete composite beam to the structure of the self-anchored suspension cable-cable-stayed cooperative system bridge, the large-span self-anchored suspension cable-cable-stayed cooperative system bridge is solved. The problem of excessive axial force of the main beam. And the present invention adopts the steel girder as the main beam of the mid-span, the structure has light weight, strong spanning ability, and fast construction speed; the concrete beam is used as the main beam of the side-span, which can play the role of weight on the one hand, and on the other hand, can be connected with the side-span pier Combined to form a stable anchor span.

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 piers; 3. Mid-span main girder; 4. Side-span main girder; 5. Main cable; 6. Stay cables; 7. 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 Figure 2, a self-anchored suspension-cable-stayed cooperative system steel-concrete composite bridge, including main tower 1, side-span pier 2, main girder, main cable 5, stay cable 6 and suspender 7, all The main girder is supported by the main tower 1, the side-span pier 2, the main cable 5 and the stay cable 6, and the main girder is supported by the mid-span main girder 3 located in the middle and the mid-span main girder located in the mid-span The side span main girders 4 on both sides of the main girder 3 are connected, the middle part of the mid-span main girder 3 is connected with the main cable 5 through the suspender 7, and the mid-span main girder 3 is a steel structure box girder , the side span main girder 4 is a concrete 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 present invention adopts a structure in which the mid-span main girder is a steel girder and the side-span main girder is a concrete girder, which reduces the huge axial force transmitted from the main cable to the main girder and the main tower, and forms a steel main girder, a concrete main beam, a main cable, and a suspender It is a self-anchored suspension cable-cable-stayed cooperative system bridge composed of main components such as , cable-stayed cables and main tower. 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-concrete composite 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, described girder by be arranged in middle part across girder and be arranged in the described end bay girder across girder both sides and be formed by connecting, be connected with described main push-towing rope by described suspension rod across the middle part of girder in described, it is characterized in that, be steel-structure box girder across girder in described, described end bay girder is concrete structure case beam.