CN218911093U

CN218911093U - Upper bearing truss arch bridge structure without horizontal thrust

Info

Publication number: CN218911093U
Application number: CN202222911320.5U
Authority: CN
Inventors: 康厚军; 郑洛; 郭铁丁
Original assignee: Guangxi University
Current assignee: Guangxi University
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-04-25
Anticipated expiration: 2032-11-02

Abstract

The utility model relates to an upper bearing truss arch bridge structure without horizontal thrust. The upper bearing truss arch bridge structure without horizontal thrust comprises an arch ring, a bridge surface beam, an upright post, a steel web member and a inhaul cable. The connection mode of the arch springing and the bridge pier of the arch ring adopts a sliding hinge support. The upper end and the lower end of the steel web member are respectively connected with the bridge surface beam and the arch ring through welding or bolts to form a truss structure. The two ends of the inhaul cable are anchored below the arch ring in the horizontal direction. In the arrangement, the horizontal component force applied to the arch ring enables the sliding hinge support at the arch foot to generate horizontal displacement, the truss structure formed by the arch upper steel web members restrains the displacement of the arch ring, the horizontal thrust of the arch ring is transmitted back to the bridge surface beam, and the under-arch inhaul cable restrains the deformation of the upper part of the arch ring. The structure improves the structural stability of the arch bridge, achieves the purpose of counteracting the horizontal thrust of the arch springing, and can be applied to soft foundation areas.

Description

Upper bearing truss arch bridge structure without horizontal thrust

Technical Field

The application relates to the technical field of arch bridge structures, in particular to an upper bearing truss arch bridge structure without 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

In order to solve the problem that the upper bearing type truss arch bridge cannot be applied in soft foundation areas due to overlarge horizontal thrust at arch feet, the upper bearing type truss arch bridge structure with stable structure and no horizontal thrust is provided.

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

an upper bearing truss arch bridge structure without horizontal thrust comprises an arch ring, a bridge surface beam, an upright post, a steel web member and a inhaul cable. The connection mode of the arch springing of the arch ring and the bridge pier adopts a sliding hinged support; the upper end and the lower end of the steel web member are respectively connected with the bridge surface beam and the arch ring through welding or bolts to form a truss structure; the two ends of the inhaul cable are anchored below the arch ring in the horizontal direction.

Further set up: the arch bridge structure adopts a hollow type upper bearing arch bridge structure.

Further set up: the arch ring adopts an arch ring structure which can bear large bending moment, such as a steel structure, a stiff framework structure or a steel pipe concrete structure.

Further set up: when the steel web members are connected with the bridge surface beam and the arch ring, if the space distance between the bridge surface beam and the arch ring is large, the steel web members are respectively arranged on the left and right sides of each upright post under the bridge surface beam, the upper ends of the steel web members are anchored at the joint positions where the upright posts are connected with the bridge surface beam, and the lower ends of the steel web members are anchored on the arch ring to form a truss structure; if the space distance between the bridge surface beam and the arch ring is smaller, the steel truss cannot effectively restrict the arch ring to deform, steel web members are not arranged, and the two ends are anchored below the arch ring in the horizontal direction by adopting a prestress inhaul cable.

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

The application provides an upper-bearing truss arch bridge structure without horizontal thrust, which has the following beneficial effects:

1. the utility model adopts a truss structure with high rigidity, and increases the structural rigidity.

2. The utility model adopts the steel structure, and the structure has better durability, and does not need excessive maintenance and maintenance in the later period.

3. The connection mode of the arch ring and the bridge pier in the conventional arch bridge generally adopts a fixed hinged support mode of a two-hinged arch or a fixed support mode of a hinge-free arch, the connection of the arch ring and the bridge pier in the application adopts a sliding hinged support mode, when the arch ring is stressed, horizontal component force generated by the horizontal component force can cause the tendency of horizontal displacement of the arch foot, the steel web members on the arch form a truss structure, the under-arch inhaul cable effectively constrains the displacement of the arch ring, and part of horizontal force is transmitted back to the bridge face beam through the truss structure. The structure effectively balances the horizontal thrust at the arch springing, and increases the stability of the structure in the horizontal direction. The horizontal thrust-free upper bearing truss arch bridge structure has low requirement on the foundation, so that the structure can be applied to soft foundation areas.

4. 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 arches 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 utility model;

FIG. 2 is a graph of node displacement clouds (unit: m) under finite element modeling according to an embodiment;

the figure shows: 1. bridge deck beams; 2. an arch ring; 3. a column; 4. steel web members; 5. a guy cable; 6. arch feet; 7. and (3) pier.

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.

The present embodiment provides a stable horizontal thrust free upper bearing truss arch bridge structure, referring to fig. 1, the arch bridge structure is substantially composed of bridge deck beams 1, arch rings 2, upright posts 3, steel web members 4 and inhaul cables 5, the arch bridge structure adopts a hollow upper bearing arch bridge structure, and arch feet 6 and bridge piers 7 are connected by sliding hinge supports.

Referring to fig. 1, when the space between the bridge deck beam 1 and the arch ring 2 is large, i.e. the left and right ends of the longer upright post are respectively provided with a steel web member 4, the upper end of the steel web member 4 is anchored at the joint where the upright post 3 and the bridge deck beam 1 are connected, and the lower end is anchored on the arch ring 2 to form a truss structure; when the space between the bridge deck beam 1 and the arch ring 2 is smaller, if the steel web members are arranged at the moment, the formed truss structure can not effectively restrain the deformation of the arch ring 2, so that the shorter upright post close to the midspan in the drawing is not provided with the steel web members 4 any more, but two ends of the guy cable 5 are anchored below the arch ring 2 in the horizontal direction, wherein the guy cable 5 needs to adopt a prestress steel beam.

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, the horizontal thrust born by the arch springing can enable the arch springing to horizontally displace, and at the moment, the truss structure formed by the steel web members 4 and the prestressed inhaul cable 5 jointly restrict the arch ring 2 to deform, so that the horizontal displacement of the arch springing is controlled. Wherein, the steel web members 4 transmit part of the axial force of the arch ring 2 back to the bridge girder 1 to form the axial force of the girder, and the inhaul cables 5 transmit part of the axial force of the arch ring 2 to be the axial force in the cable.

According to the utility model, the steel web members are arranged above the arch ring to form a plurality of triangular structures, so that the arch ring is effectively restrained and stressed, and the linear rigidity of the arch ring is increased. The cable below the arch ring also controls the arch ring deformation, and the arch ring deformation can be adjusted by changing the prestress of the cable. 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 present example is roughly simulated and further described by finite element software, and the arch bridge is a single-span steel pipe concrete arch bridge, the span is 100m, the arch axis type is catenary, the arch axis coefficient m is 1.347, the load class is class I of the highway, the bridge deck width is 30m, the thickness is 0.35m, the arch ring adopts a single round steel pipe concrete section with the outer diameter of 1200mm and the inner diameter of 1000mm, and the upright posts and the steel web members are round sections with the diameter of 600 mm.

Referring to fig. 2, the first-level road load and the dead weight load are applied to the embodiment by using Ansys software, and static solution is performed. According to calculation of the horizontal thrust-free upper bearing truss arch bridge structure by the scheme, the horizontal displacement of the node at the arch foot is 7cm, and the full bridge only has vertical support counter force.

Further, in the horizontal thrust free upper bearing truss arch bridge structure provided by the utility model, the deformation and stress condition of the arch rib can be controlled by adjusting the prestress and the anchoring position of the under-arch inhaul cable or changing the setting position of the steel web member.

The foregoing description of the preferred embodiments of the utility model 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 utility model.

Claims

1. The upper bearing type truss arch bridge structure without horizontal thrust is characterized by comprising an arch ring, bridge surface beams, upright posts, steel web members and inhaul cables, wherein a sliding hinged support is adopted for the connection mode of arch legs of the arch ring and bridge piers; the upper end and the lower end of the steel web member are respectively connected with the bridge surface beam and the arch ring through welding or bolts to form a truss structure; the two ends of the inhaul cable are anchored below the arch ring in the horizontal direction.

2. The horizontal thrust free upper bearing truss arch bridge structure of claim 1, wherein: the arch bridge structure adopts a hollow type upper bearing arch bridge structure.

3. The horizontal thrust free upper bearing truss arch bridge structure of claim 1, wherein: the arch ring adopts a steel structure, a stiff framework structure or a steel pipe concrete structure.

4. The horizontal thrust free upper bearing truss arch bridge structure of claim 1, wherein: when the steel web members are connected with the bridge surface beam and the arch ring, if the space distance between the bridge surface beam and the arch ring is large, the steel web members are respectively arranged on the left and right sides of each upright post under the bridge surface beam, the upper ends of the steel web members are anchored at the joint positions where the upright posts are connected with the bridge surface beam, and the lower ends of the steel web members are anchored on the arch ring to form a truss structure; if the space distance between the bridge surface beam and the arch ring is smaller, the steel truss cannot effectively restrict the arch ring to deform, steel web members are not arranged, and the two ends are anchored below the arch ring in the horizontal direction by adopting a prestress inhaul cable.