CN210140764U - Double-fold-line-shaped bridge span assembly stiffened through inhaul cable - Google Patents

Double-fold-line-shaped bridge span assembly stiffened through inhaul cable Download PDF

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Publication number
CN210140764U
CN210140764U CN201920452945.5U CN201920452945U CN210140764U CN 210140764 U CN210140764 U CN 210140764U CN 201920452945 U CN201920452945 U CN 201920452945U CN 210140764 U CN210140764 U CN 210140764U
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cable
bridge
stay
main
fold
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黄卓驹
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Architecture Design and Research Institute of Tongji University Group Co Ltd
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Architecture Design and Research Institute of Tongji University Group Co Ltd
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Abstract

The utility model relates to a double-fold-line-shaped span assembly stiffened by stay cables, which comprises a girder and a stay cable brace assembly, wherein two ends of the girder are arranged on a pier; the stay cable stay bar component comprises a stay bar and a stay cable, and the bridge plane on the main beam is a double-fold bridge plane and comprises a middle section and bending sections arranged on two sides of the middle section; the stay cable stay bar component is assembled with the lower plane of the main beam; the connecting line department of kink and interlude is equipped with the vaulting pole, the one end and the vaulting pole of cable are connected, and the other end is connected with the tip of kink or adjacent connecting wire. Compared with the prior art, the utility model has the advantages of be applicable to multiple road trend and view demand, span length, stability are good, the structure is light and handy, reduce to the requirement of pier, the on-bridge field of vision is wide and the navigation space is high under the bridge.

Description

Double-fold-line-shaped bridge span assembly stiffened through inhaul cable
Technical Field
The utility model relates to a building and bridge field, concretely relates to double-fold line shape bridge span subassembly that cable was stiffened.
Background
Traditionally, there are four bridge construction systems: girder bridges, arch bridges, suspension bridges, rigid frame bridges. With the development of building materials and design technologies, novel bridge systems are derived on the basis of four bridge types. Such as cable-stayed bridges, suspension bridges, etc.
The bridge span structure can be divided into single span, two spans, three spans, multi-span and the like according to the bridge span structure number of the bridge. The bridge span quantity is less, and the pier of required lower part just is less, because pier can influence the channel and pass, and its construction is generally under water, and the construction is expensive, and the operation is difficult and the risk is great. It is generally desirable to achieve spanning using as large spans as possible and as small a number of bridge spans as possible, as economic and technical conditions permit.
In addition, the planar design of the bridge is not free, and the trend of roads at two ends of the bridge or the landscape requirement need to be considered. If the roads at the two ends cannot be completely opposite, a curved bridge or a broken line bridge is needed. The curve bridge is characterized in that torque is generated in a beam body under vertical load, and the bridge body is possibly twisted to generate the problem of uneven road surface or overturning. In order to enable the bridge to adapt to the situation that the directions of roads at two ends cannot be completely opposite, the bridge span needs to be designed, so that the bridge span is bent, and the direction of the whole bridge is changed. The bridge in general does not adapt well to these curved bridges for traffic or landscape reasons. Often the traffic function or the landscape is required to be adjusted to the design of the bridge, resulting in a certain influence on the function or appearance.
Therefore, a bridge span assembly needs to be designed, the bridge span assembly is applied to a bridge, the bridge span assembly is kept stable under the condition of the span as large as possible, and local bending can be realized, so that the trend of the bridge is changed, and the requirements of various design environments are met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a double-fold line shape bridge span subassembly that cable was stiffened in order to overcome the defect that above-mentioned prior art exists, can with the utility model discloses a double-fold line shape bridge span subassembly that cable was stiffened is applied to the bridge as the bridge span in, as one section structure in the bridge.
The purpose of the utility model can be realized through the following technical scheme:
a double-fold-line-shaped span assembly stiffened by a stay cable comprises a main beam and a stay cable brace assembly, wherein two ends of the main beam are arranged on a bridge pier; the stay cable stay bar component comprises a stay bar and a stay cable, and the bridge plane on the main beam is a double-fold bridge plane and comprises a middle section and bending sections arranged on two sides of the middle section; the stay cable stay bar component is assembled with the lower plane of the main beam; the connecting line department of kink and interlude is equipped with the vaulting pole, the one end and the vaulting pole of cable are connected, and the other end is connected with the tip of kink or adjacent connecting wire.
The length of the middle section is 0.2-0.4 times of the length of the main beam.
The stay bar is obliquely and downwards installed on the main beam, and the installation direction of the stay bar faces to the opening direction of the broken line angle.
The included angle between the stay bar and the lower plane of the main beam is 20-70 degrees, and the length of the stay bar is 0.1-0.3 times of the span of the double-fold-line-shaped bridge span component.
The stay bars and connecting lines of the bending sections and the middle sections are located on the same vertical plane, and the two adjacent stay bars are arranged in a central symmetry mode.
The stay cables connected to the same stay rod are continuous stay cables or stay cables disconnected at the stay rod.
The guy cables between the anchoring point of the main beam sheet and the stay bar are one or a plurality of scattered guy cables.
The main beam is a box beam or an n-shaped beam.
To the utility model discloses the design method of the double-fold line shape bridge span subassembly that well cable was stiffened includes following steps:
(1) selecting bridge planes, longitudinal sections and cross section structures of the main beams;
(2) calculating the prestress of a guy cable, wherein the prestress causes the main beam to be reversely arched, and the reverse arch degree is equal to or equivalent to the bridge deflection of the main beam under the sum of the dead load and the live load of 0.5 time;
(3) checking and calculating the strength, rigidity, stability, anti-overturning performance, anti-seismic performance and construction process parameters of the bridge;
(4) and (4) if the conclusion that the anti-seismic performance does not meet the design requirements is calculated in the step (3), adding a damper on the double-fold-line-shaped bridge to reduce the vibration of the bridge.
The utility model also provides a manufacturing method of the double-fold line-shaped bridge span assembly stiffened by the stay cable, which comprises the following steps:
(1) preparing a main beam, a stay bar and a stay cable component, and temporarily fixing the main beam through a jig frame in a construction site;
(2) a stay bar and a stay cable are arranged on the main beam, and cable force adjustment is needed when one stay cable is erected; the method for adjusting the cable force comprises the following steps: tensioning the stay cable to a designed pre-tension value by adopting a one-time tensioning, batch tensioning or over-tensioning method, wherein the designed pre-tension value is 20% -50% of the designed initial pre-tension of the stay cable;
(3) hoisting the main beam obtained in the step (2) to a position between designed piers or abutments, and aligning the main beam with supports on the piers or abutments;
(4) welding the main beam at the connection position of the bridge pier or the bridge abutment;
(5) and (5) construction and unloading, and completing bridge installation.
Compared with the prior art, the beneficial effects of the utility model are embodied in following several aspects:
1. the double-fold-line-shaped bridge deck routing is suitable for the condition that the road directions at two ends cannot be completely aligned;
2. the structure stiffened by the stay cables is adopted, the integral bending resistance height of the structure in the horizontal direction and the vertical direction is objectively increased by the stay cables, and the material is applied to the edge position on the outer side of the structure which is most effective in resisting bending moment, so that the efficiency of performance exertion of the material is high, and the structural rigidity can be effectively increased, therefore, the utility model has better in-plane rigidity and out-of-plane rigidity for a large-span broken line bridge;
3. the structure is light. Compared with a common structural bridge, the stay cable can minimize the section because the main tension part of the bridge is adopted without instability, and the compression part is a steel beam, so that the stability is easy to guarantee. Therefore, the utilization efficiency of the whole material is high, and compared with a common beam bridge, the self weight of the bridge body is greatly reduced, and the material is saved.
4. The horizontal force to the support and the foundation is small. Under the appropriate circumstances of design, the utility model discloses the cable and the pontic of bridge can realize drawing and pressing balancedly, can realize zero horizontal force to the pier abutment of both sides, reduce pile foundation cost.
5. The field of vision on the bridge is wide. The stress structure is mainly arranged at the lower part. No structure above the bridge surface can block the visual field. Compared with other bridge types such as suspension bridges, cable-stayed bridges, deck arch bridges and the like, the bridge has wider landscape and visual field.
6. The navigation space under the bridge is high, and compared with a common truss bridge or a beam bridge, the middle structural height between the two cable supports is extremely small, so that the central line of the channel has great clear height, and larger ship navigation is allowed.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic top view of the present invention;
fig. 3 is a schematic view of the structure of the present invention;
fig. 4 is a schematic side view of the present invention;
FIG. 5 is a schematic view of the exploded structure of the present invention;
FIG. 6 is a representation of the pre-stressed inverted arch of the present invention;
FIG. 7 is a schematic structural view of a three-span bridge in which the present invention is applied;
fig. 8 is a schematic top view of a three-span bridge according to the present invention;
fig. 9 is a schematic front view of a three-span bridge in which the present invention is applied;
FIG. 10 is a deformation diagram of the three-span bridge according to the present invention;
in the figure, 1 is a main beam, 2 is a stay bar, 3 is a stay cable, 4 is a pier, 5 is a left side span, and 6 is a right side span.
Detailed Description
The embodiments of the present invention will be described in detail below, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A cable-stiffened double-fold-line-shaped bridge span assembly is shown in figures 1 and 5 and comprises a main beam 1 and a cable stay bar assembly, wherein two ends of the main beam 1 are arranged on a support of a pier 4, and the main beam 1 is selected to be an n-shaped beam; the stay cable stay bar component comprises a stay bar 2 and a stay cable 3, the bridge plane on the main beam 1 is a double-fold bridge plane, and comprises a middle section and bending sections arranged on two sides of the middle section, and the length of the middle section is 1/3 times of that of the main beam, as shown in fig. 2; the stay cable stay bar component is assembled with the lower plane of the main beam 1, so that the stay cable stay bar component does not influence the view on the bridge surface at the upper part of the bridge, as shown in fig. 3 and 4, a stay bar 2 is arranged at the connecting line of the bending section and the middle section, the stay bar 2 is obliquely and downwards installed on the main beam 1, the installation direction faces the opening direction of the bending angle, the stay bar 2 and the connecting line of the bending section and the middle section are positioned on the same vertical plane, the included angle between the stay bar 2 and the lower plane of the main beam 1 is 45 degrees, and the length of the stay bar is 0.2 times of the span of the double-fold line-shaped; one end and the vaulting pole 2 of cable 3 are connected, and the other end is connected with the tip of kinking or adjacent connecting wire, and the cable 3 of connecting on same vaulting pole 2 is the cable 3 of breaking off in vaulting pole 2 department to cable 3 is the cable together at the single anchor point of girder 1 and the cable 3 between vaulting pole 2.
The embodiment also provides a design method of the stay cable stiffened double-fold-line-shaped bridge span component, which comprises the following steps:
(1) selecting and designing bridge planes, longitudinal sections and cross section structures of the main beam 1;
(2) calculating the prestress of the cable 3, wherein the prestress in the cable 3 is determined according to the following criteria: the prestress causes the main beam 1 to arch reversely, the degree of the reverse arch is equal to, equal to or close to the bridge deflection of the main beam 1 under the sum of the dead load and the live load of 0.5 time, as shown in fig. 6, the dotted line is the structural schematic diagram of the bridge after the bridge is arched reversely after the prestress is added, and the structural schematic diagram is realized as the initial structural schematic diagram of the bridge;
(3) checking and calculating the strength, rigidity, stability, anti-overturning performance, anti-seismic performance and construction process parameters of the bridge;
(4) and (4) if the conclusion that the anti-seismic performance does not meet the design requirements is calculated in the step (3), adding a damper on the double-fold bridge, and reducing the vibration of the bridge.
The construction method of the double-fold-line-shaped bridge span component stiffened by the inhaul cable comprises the following steps:
(1) preparing a main beam 1, a stay bar 2 and a stay cable component, wherein the components are processed in a factory and then transported to a river bank of a construction site, and the main beam 1 is temporarily fixed on the river bank of the construction site through a moulding bed;
(2) a stay bar 2 and a stay cable 3 are arranged on a main beam 1, and cable force adjustment is needed when one stay cable 3 is erected; the method for adjusting the cable force comprises the following steps: tensioning the stay cable 3 to a designed pre-tensioning force value by adopting a one-time tensioning, batch tensioning or over-tensioning method, wherein the designed pre-tensioning force value is 30% of the normal use limit state of the stay cable 3;
(3) hoisting the main beam 1 obtained in the step (2) to a position between designed piers 4 or abutments through a floating crane or a crane on a shore, and aligning the main beam 1 with supports on the piers 4 or abutments;
(4) welding and fixing the joint of the main beam 1 and the bridge pier 4 or the bridge abutment;
(5) and (5) construction and unloading, and completing bridge installation.
Example 2
A double-fold-line-shaped span assembly stiffened by stay cables is shown in figures 1 and 5 and comprises a main beam 1 and a stay cable strut assembly, wherein two ends of the main beam 1 are arranged on a support of a pier 4, and the main beam 1 is selected as a box girder; the stay cable stay bar component comprises a stay bar 2 and a stay cable 3, the bridge plane on the main beam 1 is a double-fold bridge plane and comprises a middle section and bending sections arranged on two sides of the middle section, and the length of the middle section is 0.2 times of that of the main beam, as shown in figure 2; the stay cable stay bar component is assembled with the lower plane of the main beam 1, so that the stay cable stay bar component does not influence the view on the bridge surface at the upper part of the bridge, as shown in fig. 3 and 4, a stay bar 2 is arranged at the connecting line of the bending section and the middle section, the stay bar 2 is obliquely and downwards installed on the main beam 1, the installation direction faces the opening direction of the bending angle, the stay bar 2 and the connecting line of the bending section and the middle section are positioned on the same vertical plane, the included angle between the stay bar 2 and the lower plane of the main beam 1 is 20 degrees, and the length of the stay bar is 0.1 time of the span of the double-fold line-shaped; one end and the vaulting pole 2 of cable 3 are connected, and the other end is connected with the tip of buckling piece or adjacent connecting wire, and the cable 3 of connecting on same vaulting pole 2 is continuous cable to cable 3 is the twice cable of dispersion at the single anchor point of girder 1 and the cable 3 between vaulting pole 2.
The construction method of the double-fold-line-shaped bridge span component stiffened by the inhaul cable comprises the following steps:
(1) preparing a main beam 1, a stay bar 2 and a stay cable component, wherein the components are processed in a factory and then transported to a river bank of a construction site, and the main beam 1 is temporarily fixed on the river bank of the construction site through a moulding bed;
(2) a stay bar 2 and a stay cable 3 are arranged on a main beam 1, and cable force adjustment is needed when one stay cable 3 is erected; the method for adjusting the cable force comprises the following steps: tensioning the stay cable 3 to a designed pre-tensioning force value by adopting a one-time tensioning, batch tensioning or over-tensioning method, wherein the designed pre-tensioning force value is 20% of the normal use limit state of the stay cable 3;
(3) hoisting the main beam 1 obtained in the step (2) to a position between designed piers 4 or abutments through a floating crane or a crane on a shore, and aligning the main beam 1 with supports on the piers 4 or abutments;
(4) welding and fixing the joint of the main beam 1 and the bridge pier 4 or the bridge abutment;
(5) and (5) construction and unloading, and completing bridge installation.
The double-fold-line-shaped bridge assembly of the embodiment is adopted as a main span, and is applied to a three-span continuous bridge, the total length of the bridge is 46m, the main span is 30m, and due to the requirements of watercourse water affairs and navigation height, the bridge is designed into the three-span continuous bridge, which comprises the middle main span, and a left side span 5 and a right side span 6 which are arranged at two sides of the main span, as shown in fig. 7 and 8, and is arranged on a watercourse, as shown in fig. 9. The box girder is used as a main girder 1, a whole steel plate is used as a support rod 2, two parallel guys are arranged in each set of guy 3, 400kN pretension force is applied to each guy 3 through calculation, the inverted arch of the bridge is basically consistent with the deflection under constant load and 0.5 time live load, the bridge floor is basically straight during normal use, the strength, the deformation and the stability of the bridge can be ensured through other rechecks, the deformation condition of the bridge in the use state is calculated, as shown in figure 10, the darker the bridge represents that the deformation is larger, in the figure, the deformation of the two ends of the main span is smaller than that of the middle section, specifically, the deformation of the two ends of the main span is 0-9 mm, the maximum deformation of the middle section of the main span is 90mm, the deformation of the main span designed by the embodiment is smaller, the tension-compression balance between the guys 3 and the bridge body can be realized, and the bridge pier on two sides. In order to control the vibration of the bridge deck, a set of tuned mass damper system is arranged in the bridge, and the three-span bridge is segmented and transported to a river bank, then spliced, tensioned and hoisted in place, so that the construction is completed.
Example 3
A cable-stiffened double-fold-line-shaped bridge span assembly is shown in figures 1 and 5 and comprises a main beam 1 and a cable stay bar assembly, wherein two ends of the main beam 1 are arranged on a support of a pier 4, and the main beam 1 is selected to be an n-shaped beam; the stay cable stay bar component comprises a stay bar 2 and a stay cable 3, the bridge plane on the main beam 1 is a double-fold bridge plane and comprises a middle section and bending sections arranged on two sides of the middle section, and the length of the middle section is 0.4 times of that of the main beam, as shown in figure 2; the stay cable stay bar component is assembled with the lower plane of the main beam 1, so that the stay cable stay bar component does not influence the view on the bridge surface at the upper part of the bridge, as shown in fig. 3 and 4, a stay bar 2 is arranged at the connecting line of the bending section and the middle section, the stay bar 2 is obliquely and downwards installed on the main beam 1, the installation direction faces the opening direction of the bending angle, the stay bar 2 and the connecting line of the bending section and the middle section are positioned on the same vertical plane, the included angle between the stay bar 2 and the lower plane of the main beam 1 is 70 degrees, and the length of the stay bar is 0.3 times of the span of the double-fold line-shaped; one end and the vaulting pole 2 of cable 3 are connected, and the other end is connected with the tip of buckling piece or adjacent connecting wire, connects cable 3 for the cable 3 of breaking off in vaulting pole 2 department on same vaulting pole 2 to cable 3 is the cable together at the single anchor point of girder 1 and cable 3 between vaulting pole 2.
The construction method of the double-fold-line-shaped bridge span component stiffened by the inhaul cable comprises the following steps:
(1) preparing a main beam 1, a stay bar 2 and a stay cable component, wherein the components are processed in a factory and then transported to a river bank of a construction site, and the main beam 1 is temporarily fixed on the river bank of the construction site through a moulding bed;
(2) a stay bar 2 and a stay cable 3 are arranged on a main beam 1, and cable force adjustment is needed when one stay cable 3 is erected; the method for adjusting the cable force comprises the following steps: tensioning the stay cable 3 to a designed pre-tensioning force value by adopting a one-time tensioning, batch tensioning or over-tensioning method, wherein the designed pre-tensioning force value is 50% of the normal use limit state of the stay cable 3;
(3) hoisting the main beam 1 obtained in the step (2) to a position between designed piers 4 or abutments through a floating crane or a crane on a shore, and aligning the main beam 1 with supports on the piers 4 or abutments;
(4) welding and fixing the joint of the main beam 1 and the bridge pier 4 or the bridge abutment;
(5) and (5) construction and unloading, and completing bridge installation.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (8)

1. A double-fold-line-shaped span assembly stiffened by a stay cable comprises a main beam and a stay cable brace assembly, wherein two ends of the main beam are arranged on a bridge pier; the stay cable stay bar component comprises a stay bar and a stay cable, and is characterized in that,
the bridge plane on the main beam is a double-fold-line-shaped bridge plane and comprises a middle section and bending sections arranged on two sides of the middle section;
the stay cable stay bar component is assembled with the lower plane of the main beam;
the connecting line department of kink and interlude is equipped with the vaulting pole, the one end and the vaulting pole of cable are connected, and the other end is connected with the tip of kink or adjacent connecting wire.
2. The cable stiffened, double-fold bridge span assembly of claim 1, wherein said mid-section length is 0.2 to 0.4 times said main beam length.
3. The cable-stiffened, double-fold bridge span assembly of claim 2 wherein said struts are mounted diagonally downward on said main beam and in a direction toward the opening of the fold angle.
4. The bracing cable-stiffened double-fold-line-shaped span assembly according to claim 3, wherein an included angle between the stay and a lower plane of the main beam is 20-70 degrees, and the length of the stay is 0.1-0.3 times of the span of the double-fold-line-shaped span assembly.
5. A cable stiffened, double-fold bridge span assembly as set forth in claim 3, wherein said brace and a connecting line of said bend section and intermediate section are located on the same vertical plane; and two adjacent stay bars are arranged in a central symmetry mode.
6. A cable-stiffened, double-fold span assembly of claim 1, wherein the cables connected to the same strut are continuous cables or cables that are broken at the strut.
7. The cable-stiffened, double-fold-line-shaped span assembly of claim 1, wherein said cables between said strut and said anchor point of said main beam are one or more discrete cables.
8. The cable-stiffened, double-fold bridge span assembly of claim 1 wherein said main beam is a box beam or an n-beam.
CN201920452945.5U 2019-04-04 2019-04-04 Double-fold-line-shaped bridge span assembly stiffened through inhaul cable Active CN210140764U (en)

Priority Applications (1)

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CN201920452945.5U CN210140764U (en) 2019-04-04 2019-04-04 Double-fold-line-shaped bridge span assembly stiffened through inhaul cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920452945.5U CN210140764U (en) 2019-04-04 2019-04-04 Double-fold-line-shaped bridge span assembly stiffened through inhaul cable

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