CN-121976470-A - Bridge deck crane and sling tensioning construction method of steel girder in crossing area of cable-stayed and suspension cable cooperative system bridge

CN121976470ACN 121976470 ACN121976470 ACN 121976470ACN-121976470-A

Abstract

The invention discloses a bridge deck crane and sling tensioning construction method of a steel beam in a crossing area of a cable-stayed and suspension cable cooperation system bridge, relates to the technical field of sling tensioning, and solves the technical problem that sling tensioning is not considered in the installation process of a cable-stayed and suspension cable cooperation system bridge section; the method comprises the steps of S1, constructing a steel beam in a crossing area by a cantilever of a bridge deck crane and stretching a stay cable, S2, installing a cable-carrying crane after the main cable is erected, S3, stretching the girder in a suspension area after the main cable is erected, and stretching a sling in the crossing area from a bridge tower to a midspan direction, S4, calculating the single tension cable force of the sling in the crossing area in sequence, S5, judging whether the current single cable force exceeds a design safety cable force range and a temporary equipment allowable stretching range, S6, planning batch stretching until the exceeding range meets the design safety cable force range and the temporary equipment allowable stretching range, S7, butting the sling with the steel beam in the suspension area after the stretching of the sling is completed, and finishing the construction of the steel beam in the crossing area, wherein the construction period of the cable-stayed-suspension cooperative system bridge can be saved.

Inventors

LIANG ZHIWEN
ZHOU YANFENG
TAN FEILIANG
SHAN HONGWEI
TANG MAOLIN
REN PENGJIE
DU MENGLIN
ZHAO YANING

Assignees

江苏省交通工程建设局
西南交通大学
华设设计集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260316

Claims (6)

1. The bridge deck crane and sling tensioning construction method of the steel girder in the crossing area of the cable stayed-suspension cooperative system bridge is characterized by comprising the following steps of: s1, constructing a steel beam in a crossing area and tensioning a stay cable by a cantilever of a bridge deck crane; S2, installing a cable carrying crane after the main cable is erected; s3, tensioning after the hanging rope zone main girder is hoisted, wherein the tensioning direction of the sling in the crossing zone is from the bridge tower to the midspan direction; s4, calculating the force of a single stay rope in sequence of slings in the crossing region; s5, judging whether the current single cable force exceeds a design safety cable force range and a temporary equipment tensioning allowable range; S6, planning batch tensioning when the cable tension is out of range until the safety cable tension range and the temporary equipment tensioning allowable range are met; and S7, abutting the cable with the steel beam in the suspension cable area after the cable is tensioned, and completing the construction of the steel beam in the crossing area.
2. The bridge deck crane and sling tensioning construction method of the steel girder of the intersection area of the cable stayed-suspended cable cooperation system bridge according to claim 1, wherein the S4 comprises the steps of establishing an integral calculation model, determining the unstressed lengths of all the slings in the bridge forming model based on a unstressed control method, installing and controlling the subsequent construction process based on the cable lengths, tensioning the slings based on the unstressed lengths of the slings, and installing according to the designated unstressed lengths each time, so that the tensioning force of the slings installed in a single time can be calculated.
3. The bridge deck crane and sling tensioning construction method of the steel girder in the intersection area of the cable stayed-suspended cable cooperation system bridge according to claim 1, wherein the S5 comprises the steps of comparing the tensioning cable force of the single-installed sling with the designed strand bearing force, judging whether the safety coefficient is met, if not, judging that the current single cable force exceeds the expected range, and determining the designed strand bearing force through the designed strand section.
4. The bridge deck crane and sling tensioning construction method for the steel beams in the intersection area of the cable-stayed and suspended cable cooperation system bridge according to claim 1, wherein the S6 comprises the steps that if the S5 judges that a single strand exceeds an expected range, the fact that the cable force is too large when only one strand is pulled is indicated, a plurality of strands are needed to be pulled at one time, and the number of the strands needed to be pulled at one time is determined through calculation so as to ensure the meeting of requirements.
5. The method for tensioning and constructing the bridge floor crane and the sling of the steel girder in the crossing area of the cable stayed-suspended cable cooperative system bridge according to claim 1, wherein the S7 butt joint refers to closure butt joint, the closure butt joint comprises the steps of temporarily connecting, ensuring that the vertical position and the longitudinal position can be connected and temporarily locked, and then welding a butt joint opening so as to connect the steel girder in the crossing area and the steel girder in the suspended cable area into a whole.
6. The bridge deck crane and sling tensioning construction method for the steel girder of the intersection area of the cable stayed-suspension cooperative system bridge according to claim 1, wherein a bridge closure is arranged at the junction of the suspension area and the intersection area.

Description

Bridge deck crane and sling tensioning construction method of steel girder in crossing area of cable-stayed and suspension cable cooperative system bridge Technical Field The invention relates to the technical field of sling tensioning, in particular to a bridge deck crane and sling tensioning construction method of a steel girder in a crossing region of a cable-stayed and suspended cable cooperation system bridge. Background Among the numerous structural systems of bridges, cable load-bearing systems are known for their remarkable crossing ability. The vast majority of cable bearing bridges in the world are cable stayed bridges and suspension bridges, and the span of the cable bearing bridges can reach more than kilometers. With the increase of span, another important branch of the cable bearing bridge is that a cable-stayed and suspension cable cooperative system bridge starts to slowly appear in the selection of various large-river and sea-crossing projects. The cable-stayed and suspension cable cooperation system bridge has the advantages of both suspension bridges and cable-stayed bridges, has oversized crossing capacity, and is the research direction and development trend of the oversized bridge in the future. The cable-stayed and suspension cable cooperation system mainly considers the construction of the main girder in the crossing area, and under the condition that the closure position of the whole system is set, the main girder in the crossing area has larger difference with a cable-stayed bridge in the aspects of hoisting mode and cable tensioning, particularly the weight of the beam section in the crossing area is obvious from that of a general beam Duan Chaju, and the problem of hoisting weight and the problem of later sling tensioning are required to be considered in the setting of a bridge deck crane for the beam section. The bridge intersection area beam Duan Chongliang is 1.5 times of the cable-stayed area beam Duan Chongliang, if the bridge deck crane of the original cable-stayed area is adopted for hoisting, the hoisting capacity is seriously insufficient, and the bridge deck crane needs to be modified, so that the bridge deck crane can adapt to the current hoisting requirement. When the bridge deck crane is utilized to hoist the beam section of the crossing area, a cantilever construction mode is generally adopted, the influence of the weight of the bridge deck crane needs to be considered, the stay ropes and the slings simultaneously exist in the crossing area, and the tensioning force and the tensioning time of the stay ropes and the slings in the crossing area need to be considered so as to ensure the structural safety during the construction of the beam of the crossing area and simultaneously not to interfere with the subsequent construction. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a bridge deck crane and sling tensioning construction method for a steel girder in an intersection region of a cable-stayed and suspended cable cooperation system bridge, which solves the problem that the tensioning force and the tensioning time of a stay cable and a sling in the intersection region are not considered when the steel girder in the intersection region is constructed in the installation process of a bridge section of the cable-stayed and suspended cable cooperation system so as to ensure the structural safety of the steel girder in the intersection region and not to interfere with subsequent construction. A bridge deck crane and sling tensioning construction method of a steel girder in a crossing area of a cable stayed-suspension cable cooperation system bridge comprises the following steps: s1, constructing a steel beam in a crossing area and tensioning a stay cable by a cantilever of a bridge deck crane; S2, installing a cable carrying crane after the main cable is erected; s3, tensioning after the hanging rope zone main girder is hoisted, wherein the tensioning direction of the sling in the crossing zone is from the bridge tower to the midspan direction; s4, calculating the force of a single stay rope in sequence of slings in the crossing region; s5, judging whether the current single cable force exceeds a design safety cable force range and a temporary equipment tensioning allowable range; S6, planning batch tensioning when the cable tension is out of range until the safety cable tension range and the temporary equipment tensioning allowable range are met; and S7, abutting the cable with the steel beam in the suspension cable area after the cable is tensioned, and completing the construction of the steel beam in the crossing area. Further, the S4 comprises the steps of establishing an integral calculation model, taking a bridge formation state as a starting point, carrying out reverse resolution based on a stress-free state control method, determining the stress-free lengths of all ropes in the bridge formation model, installing and