CN205804149U - Bridge rigid pulling force is put - Google Patents

Abstract

The rigid tension pendulum of the bridge can effectively solve the problem of the negative reaction force of the bridge, and can adapt to the change of the longitudinal displacement of the beam end, and there is no need to replace it within the design life of the bridge. It includes the upper pull plate fixed on the longitudinal end of the beam body, the anchor device fixed on the bridge pier, and the steel eye rod passing through the top cap and the pier column. The upper pull plate and the lower pull plate are hinged, and the lower part of the steel eye rod is fixedly connected with the anchoring device.

Description

bridge rigid tension pendulum

technical field

The utility model relates to bridges, in particular to a bridge rigid tension pendulum, which can effectively solve the problem of bridge negative reaction force, and basically does not restrict the longitudinal displacement of the bridge in normal use, and does not need to be replaced within the design life of the bridge.

Background technique

With the rapid development of bridge construction in our country, more and more long-span bridges have been built. Due to the limitation of bridge structure form and hole-span layout, the problem of negative reaction force of supports in bridge design has become increasingly prominent.

At present, for small and medium-span bridges, the negative reaction force of the support is small, which can usually be solved by setting tension bearings. For example, spherical steel bearings, pot type and plate rubber bearings can be used as tension bearings, and plate rubber tension and compression supports The seat is used for bridges with small tension, and spherical tensile steel bearings or basin-type tension bearings are more suitable for bridges with large reaction forces. However, when the negative reaction force is large, the design of the tension support is difficult and the economy is poor.

For medium and long-span bridges, when the negative reaction force of the support is large, the counterweight method can be used to solve the problem of negative reaction force. For some long-span bridges, the negative reaction force of the support is very large. If the conventional ballast method is adopted, the ballast area will be too long, the structure will be complicated, and the economy will be poor. Maintenance is very difficult. Moreover, in areas with high seismic intensity, too much pressure will increase the seismic force, which will bring great difficulties to structural design.

Utility model content

The technical problem to be solved by the utility model is to provide a bridge rigid tension pendulum, which can effectively solve the problem of negative reaction force of the bridge, and can adapt to the longitudinal displacement of the beam end, and does not need to be replaced within the design life of the bridge.

The technical solution adopted by the utility model to solve its technical problems is as follows:

The bridge rigid tension pendulum of the utility model is characterized in that it includes an upper pull plate fixedly arranged at the longitudinal end of the beam body, an anchor device fixedly arranged at the bridge pier abutment, and a steel eye rod passing through the top cap and the pier column , the upper end and the lower end of the steel eye rod are respectively hinged with the upper pull plate and the lower pull plate through pin shafts, and the lower part of the steel eye rod is fixedly connected with the anchoring device.

The beneficial effect of the utility model is that the structure is innovative, and the negative reaction force at the beam end can be transmitted to the foundation of the pier through the rigid tension pendulum, and at the same time, the longitudinal bridge direction displacement change of the beam end can be adapted through the rotation function of the pin shaft and the steel eye rod ; Its structure is simple, the force is clear, it is easy to install and maintain, and it does not need to be replaced within the design life of the bridge, which saves the amount of materials.

Description of drawings

This manual includes the following two drawings:

Fig. 1 is the installation mode schematic diagram of the utility model bridge rigid tension pendulum;

Fig. 2 is the structural representation of the utility model bridge rigid tension pendulum;

Components and corresponding marks are shown in the figure: beam body 10 , pull-up plate 20 , pin shaft 21 , steel eye rod 22 , pull-down plate 23 , anchoring device 24 , bridge abutment 30 .

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Referring to Fig. 1 and Fig. 2, the bridge rigidity tension pendulum of the present utility model comprises the pull-up plate 20 that is fixedly arranged on the longitudinal end of the beam body 10 and the anchoring device 24 that is fixedly arranged on the bridge abutment 30, and passes through the top hat and The steel eye bar 22 of pier column. The upper end and the lower end of the steel eye bar 22 are respectively hinged with the upper pull plate 20 and the lower pull plate 23 through the pin shaft 21, and the bottom of the steel eye bar 22 is fixedly connected with the anchoring device 24.

Referring to FIG. 1 , the pull-up plate 21 is connected to the beam body 10 by welding, and the pull-down plate 24 is connected to the bridge abutment 30 through an anchoring device 25 . When an upward reaction force appears at the beam end, the rigid tension pendulum device can transmit the sustained tension to the bridge pier 30 . When the beam body 10 produces longitudinal displacement, the rigid tension pendulum can adapt to the longitudinal displacement of the beam body 10 through the free rotation of the eye rod 22 connected to the pin shaft 21 , the upper pull plate 20 and the lower plate 23 .

Compared with the conventional cable-stayed bridge structure system, the utility model can better solve the problem of the negative reaction force of the side support. Through the rigid tension pendulum device of the bridge, the tension at the support can be effectively transmitted to the pier foundation, And it can adapt to the longitudinal displacement of the bridge under normal use through the rotation of the pin shaft. It does not need to be replaced within the life cycle of the bridge. Its structure is reasonable, safe and reliable, easy to maintain, can save a lot of materials, and is economical.

The applicant successfully applied the technical solution of the utility model to the design of the Zhengbei Bridge of the Agricultural Road Fast Track Project in Zhengzhou City. The Zhengbei Bridge is a two-way ten-lane highway cable-stayed bridge. The bridge spans Zhengzhou North Marshalling Station, with a skew angle of 88°. It adopts a single-tower steel-concrete composite beam cable-stayed bridge with a span of 221+221m. The bridge width is 43.0m, and the main girder adopts Steel-concrete composite beam system, the bridge tower is a reinforced concrete H-shaped bridge tower, and the foundation adopts bored piles.

The main girder adopts steel-concrete composite girder, the bridge deck is 43 meters wide, and there are 10 lanes in both directions. The main tower of the cable-stayed bridge adopts reinforced concrete H-shaped cable tower with a height of 150m. The height of the tower above the bridge deck is about 118.5m, and the height of the tower below the bridge deck is about 31.5m. The width of the main tower is 56m at the top and 60m at the bottom. The stay cables are galvanized parallel steel wire stay cables, and the stay cables at the bridge deck are equipped with external dampers.

The main girder of the cable-stayed bridge is a bonded beam in which the steel girder and the concrete slab are jointly stressed, and the two are combined with shear nails. The anchorage point of the stay cable of the combined beam is 2.6m high, the mid-span height is 3.5m, and the concrete slab thickness of the bridge deck is 26cm. The steel main girder section is a box section, and the center distance between the two steel main girders from the transverse bridge is 37.5m. There are 113 beams in the whole bridge, and the distance along the bridge direction is 4m. 700×24mm, the cross-sectional size of the bottom plate is 700×32mm (500×24mm near the main longitudinal beam), the cross-sectional size of the web is (2600～3184)×16mm, the mid-span bridge deck is divided into prefabricated part and cast-in-place part, and the prefabricated part C60 concrete is used, and C60 micro-expansion concrete is used for the cast-in-place part. The bridge deck adopts a longitudinal prestressing system. Eight ΦS15.2-12 long steel strands are installed in the whole bridge, and 40 ΦS15.2-12 prestressed steel strands are installed in the bridge deck concrete slab within 133m of the handover pier. Wire.

In order to eliminate the negative reaction force of the transfer pier, the method of combining the concrete weight near the transfer pier and setting the tension pendulum is adopted. The ballast area is located between the crossbeams near the top of the transfer pier. The ballast is 293.5kN/m within 12m along the bridge direction. A single ballast block is 27.95kN, and 126 blocks are arranged in one side span. There are a total of 252 blocks in the whole bridge, with a total weight of 7043.4kN . The beams and the ballasted longitudinal beams form a "well" grid, and the ballasted concrete blocks are placed.

The tension pendulum is made of Q500qE steel, the top of the tension pendulum is connected with two 32mm thick steel plates, the middle steel eye rod is made of a 50mm thick steel plate, and the lower anchor is made of two 32mm thick steel plates.

The bridge adopts the new structural system of the utility model. Compared with the conventional cable-stayed bridge structural system, it can better solve the problem of negative reaction force of the side support and the problem of excessive lateral seismic action. Usually, concrete weight blocks are often used to eliminate the negative reaction force of side supports, but the weight blocks will increase the lateral seismic action, which is unfavorable for the seismic resistance of side piers.

After adopting the utility model, the overall vertical stiffness of the bridge increases by 3.6%, the longitudinal bending moment at the bottom of the bridge tower under the action of vertical static live load decreases by 3.9%, the fatigue stress amplitude of the stay cables decreases by 1.1%, and the maximum cable force decreases 15.4%, and the weight of concrete blocks at beam ends is reduced by 900 tons.

To sum up, the adoption of the new structure of the utility model can effectively increase the overall vertical stiffness of the structure, improve the mechanical performance of the structure, reduce the earthquake action, thereby reducing the size of the transfer pier, and can achieve the most comprehensive combination of economy and mechanical performance. Good high degree of uniformity.

The above descriptions are just some principles of the rigid tension pendulum of the utility model bridge with illustrations, and are not intended to limit the utility model to the specific structure and scope of application shown and described, so all corresponding modifications that may be utilized and Equivalents all belong to the scope of patents applied for by the utility model.

Claims (1)

1. bridge rigid pulling force pendulum, is characterized in that: includes being fixedly installed on the upper arm-tie (20) of beam body (10) longitudinal end, fix It is arranged on the anchor (24) in Bridge Pier (30) portion, and through top cap and the steel eyebar (22) of pier stud, steel eyebar (22) Upper end, lower end hinged by bearing pin (21) and upper arm-tie (20), lower pulling plate (23) respectively, the bottom of steel eyebar (22) and anchoring Device (24) is fixing to be connected.