CN117449178A - Self-anchored upper-bearing arch bridge structure for balancing horizontal thrust - Google Patents

Abstract

The invention relates to a self-anchored and supported arch bridge structure for balancing horizontal thrust. The self-anchored upper bearing arch bridge comprises arch ribs, bridge face beams, upright posts, bridge piers, a cable anchoring device under the arch, a compression bar, a pull rod, pulleys and stiffening steel plates. And the connection mode of the arch feet of the arch ribs and the bridge pier adopts a sliding hinge support. The pulleys respectively form a fixed pulley structure with the compression bar and the pull rod and are arranged on the lower side of the arch rib. The guy cable is anchored to the inner side of the arch springing through the guy cable anchoring device, and is pulled to the arch springing at the other end of the arch rib from the arch springing through each pulley and is anchored. In the arrangement, the horizontal component force born by the arch rib enables the sliding hinge support at the arch foot to generate horizontal displacement, the guy cable device under the arch can restrict the arch foot displacement, the horizontal thrust of the arch rib can be balanced to a certain extent, the horizontal thrust is transmitted back to the arch rib through the guy cable and fixed pulley structure, the structural stability of the arch seat is improved, the aim of optimizing stress is achieved, and the arch bridge can be applied to soft foundation areas.

Description

Self-anchored upper-bearing arch bridge structure for balancing horizontal thrust

Technical Field

The application relates to the technical field of arch bridge structures, in particular to a self-anchored and supported arch bridge structure for balancing horizontal thrust.

Background

Arch bridges are a common bridge structural type with long development history, and are widely applied to various bridge projects in terms of attractive line shape, good stress performance and excellent crossing capacity. In particular, in mass construction of infrastructure such as expressways and high-speed railways, more and more arch bridges are favored by engineers and owners as crossing structures, and are successfully applied to actual engineering, so that better economic and social benefits are obtained.

Because other arch bridges have horizontal thrust action on the abutment by arch feet under the action of vertical load except for an internal hyperstatic or external statically-fixed combined system arch bridge with some thrust borne by a rigid beam or a flexible rod piece, most arch bridges are applied to terrains such as deep ditches and canyons in the aspect of bridge site selection, have high geological requirements, and have large abutment design and troublesome construction in order to prevent the abutment from moving or rotating.

Disclosure of Invention

The purpose of this application aims at providing a stable structure's self-anchored bearinglike arch bridge structure of balanced horizontal thrust.

In order to achieve the above object, the present application provides the following technical solutions:

a self-anchored upper-bearing arch bridge structure for balancing horizontal thrust force comprises arch ribs, bridge surface beams, upright posts, bridge piers, an underarch inhaul cable anchoring device, a compression bar, a pull bar, pulleys and stiffening steel plates. And the connection mode of the arch feet of the arch ribs and the bridge pier adopts a sliding hinge support. The pulleys respectively form a fixed pulley structure with the compression bar and the pull rod and are arranged on the lower side of the arch rib. The guy cable is anchored to the arch springing through the guy cable anchoring device, and is pulled to the arch springing at the other end of the arch rib from the arch springing through each pulley and is anchored.

Further set up: the compression bar and the pull rod form a pressure-bearing fixed pulley and a tension fixed pulley with the pulleys respectively, and are arranged at the lower side of the arch rib through anchors to form a cantilever structure.

Further set up: the guy wires are anchored to the arch springing in a horizontal direction for transmitting forces in the horizontal direction.

Further set up: the first fixed pulley structure arranged beside the arch legs at two ends of the arch rib is required to adopt the compression bar, and all other fixed pulley structures adopt the pull bar and are reasonably arranged at the lower side of the arch rib.

Further set up: when the inhaul cable passes through the pressure-bearing fixed pulley at the pressure lever, the inhaul cable passes through the fixed pulley from the end far away from the arch rib of the pulley.

Further set up: when the guy cable passes through the fixed pulley at the pull rod, the guy cable passes through the fixed pulley from the end, close to the arch rib, of the pulley.

Further set up: two ends of a pulley center rotating shaft in the pressure-bearing fixed pulley structure are respectively connected with three rods to form a truss structure, and the truss structure can be used for avoiding pressure instability during pressure bearing.

Further set up: and the bearing fixed pulley and the arch springing are welded with stiffening steel plates on the arch ribs to resist the shearing force between the arch springing and the bearing fixed pulley.

Further set up: the inhaul cable adopts a prestress steel beam.

The application provides a balanced horizontal thrust's self-anchored over-the-counter arch bridge structure, it has following beneficial effect at least:

1. the connection of the arch rib and the bridge pier in the conventional arch bridge generally adopts a fixed hinged support manner of a two-hinged arch or a fixed support manner of a hinge-free arch, the connection of the arch rib and the bridge pier in the application adopts a sliding hinged support manner, when the arch rib is stressed, horizontal component force generated by the horizontal component force can cause horizontal displacement of the arch springing, the guy cable anchored to the arch springing in the horizontal direction can restrict the displacement of the arch springing, the horizontal thrust at the arch springing is converted into the pulling force along the guy cable, and the pulling force is transmitted back to the arch rib through the fixed pulley structure of the traction guy cable. The structure effectively balances the horizontal thrust at the arch foot, increases the stability of the structure in the horizontal direction, and the inhaul cable path is close to the arch rib, so that the navigation requirement under the arch bridge is not influenced. The self-anchored arch bridge structure for balancing horizontal thrust has low requirement on the foundation, so the self-anchored arch bridge structure can be applied to soft foundation areas.

2. The horizontal thrust is balanced to this application in can being applied to continuous porous big, the arch bridge of midspan footpath, so the horizontal atress of different arch ribs in the porous arch bridge mutually independent, can avoid taking place the condition that a hole destroyed and influence full bridge safety, and simple structure, the construction degree of difficulty is not high.

Drawings

FIG. 1 is a schematic diagram of a structure of the present invention;

FIG. 2 is an enlarged view of one side structure of FIG. 1;

the figure shows: 1. bridge deck beams; 2. a column; 3. arch ribs; 4. bridge piers; 5. arch feet; 11. a cable anchoring device; 12. a compression bar; 13. a pull rod; 14. a pulley; 15. a guy cable; 16. and (5) stiffening the steel plate.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like or functionally like elements throughout the various views. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present application and are not to be construed as limiting the present application.

Referring to fig. 1, the present application relates to a self-anchored supported arch bridge structure with stable structure and balanced horizontal thrust, which is mainly composed of bridge deck beams 1, upright posts 2, arch ribs 3, piers 4 and arch feet 5, wherein the arch feet 5 and the piers 4 are connected by adopting sliding hinge supports.

Referring to fig. 1 and 2, a cable anchoring device 11 is installed on the inner side of the arch leg 5, one end of a cable 15 is anchored to the inner side of the arch leg 5 by the cable anchoring device 11, a compression bar 12 is installed beside the arch leg 5 and under the arch rib 3, a pulley 14 is installed on the other end of the compression bar 12 to form a bearing fixed pulley structure, the top of the bearing fixed pulley is required to be on the same horizontal line with the cable anchoring device 11, and the arch leg at the other end of the arch rib are arranged in the same way. The pull rods 13 are reasonably arranged at the lower sides of the arch ribs between the two compression rods 12, and pulleys 14 are respectively arranged at the end parts of the pull rods 13 to form a tension fixed pulley structure. The guy cable 15 is horizontally pulled out from the arch springing 5, passes through the outermost side of the pressure-bearing fixed pulleys, passes through one side of each tension fixed pulley close to the arch rib, and finally is anchored to the arch springing at the other end. The two sides of the central rotating shaft of the pulley are respectively connected with three rods to form a truss structure, so that the truss structure can be used for avoiding pressure instability during pressure bearing; and the rotating shafts at two sides of the pulley are respectively connected with the same rod piece. The stiffening steel plate 16 is welded to the rib at the location from the arch to the pressure-bearing fixed pulley to resist the shearing force between the arch and the pressure-bearing fixed pulley.

When the arch bridge is in operation (or in use), when the load born by the upper structure of the arch bridge is transferred to the arch springing 5, the horizontal thrust born by the arch springing 5 can horizontally displace itself, and at the moment, the guy cable 15 restrains the displacement of the arch springing 5 and bears horizontal pulling force, and the horizontal pulling force forms axial pulling force along the path of the guy cable 15. The pressure-bearing fixed pulley is contacted with the inhaul cable 15 and is pressed, and the pressure is further transmitted back to the arch rib 3 through the pressure rod 12. The fixed pulley is contacted with the inhaul cable 15 and is pulled, and the pulling force is further transmitted back to the arch rib 3 through the pull rod 13. Through the process, the horizontal thrust at the arch springing is effectively balanced by the structure, and the stability of the structure in the horizontal direction is improved.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (6)

1. The utility model provides a balanced horizontal thrust's self-anchored over-the-counter arch bridge structure, its characterized in that includes cable anchor (11), depression bar (12), pull rod (13), pulley (14), cable (15), stiffening steel plate (16) under the arch, depression bar (12) and pull rod (13) constitute fixed pulley structure with pulley (14) respectively, cable anchor (11) are installed respectively in arch rib both ends arch foot inboard, cable (15) are fixed cable anchor (11) in arch foot department, extend to the pulley outside of depression bar (12) department to along the pulley inboard of arch rib downside pull rod (13) department, pull to other end arch foot department and anchor.

2. The self-anchored, supported arch bridge structure of claim 1 that balances horizontal thrust, characterized by: two pressure-bearing fixed pulley structures formed by the pressure lever (12) and the pulley (14) are respectively anchored at the lower sides of arch ribs beside two arch feet, and the top of the pulley is required to be in the same horizontal line with a guy cable anchoring device (11) at the arch feet.

3. The self-anchored, supported arch bridge structure of claim 1 that balances horizontal thrust, characterized by: the pull rod (13) and the fixed tension pulley structures formed by the pulleys (14) are anchored at the lower sides of arch ribs between the fixed pressure-bearing pulleys; in addition, the tension fixed pulley can be changed into a pressure-bearing fixed pulley and anchored on the upper side of the arch rib, and at the moment, the inhaul cable passes through the arch rib from the lower arch to the upper arch after passing through the pressure-bearing fixed pulley beside the arch foot and is pulled by the pressure-bearing fixed pulley on the upper arch.

4. The self-anchored, supported arch bridge structure of claim 1 that balances horizontal thrust, characterized by: the inhaul cable (15) is required to be pulled out in a horizontal direction and pass through the outer side of the pressure-bearing fixed pulley when being anchored at the arch springing.

5. The self-anchored, supported arch bridge structure of claim 1 that balances horizontal thrust, characterized by: the arch leg of the arch rib (3) is connected with the bridge pier (4) by adopting a sliding hinge support.

6. The self-anchored, supported arch bridge structure of claim 1 that balances horizontal thrust, characterized by: and a stiffening steel plate (16) is welded on the arch rib (3) from the arch foot of the arch rib (3) to the pressure-bearing fixed pulley.