CN-121381522-B - Method for installing closure section of suspension bridge

CN121381522BCN 121381522 BCN121381522 BCN 121381522BCN-121381522-B

Abstract

The application relates to the technical field of suspension bridge construction, in particular to a method for installing a closure section of a suspension bridge, which comprises the steps of firstly, arranging beam fields on two sides of the suspension bridge, taking an approach bridge as a beam conveying channel, adopting a bracket method to set up a supporting platform, and placing the end section steel truss girder on a supporting platform through a crane to form a lifting platform, finishing the installation of the midspan section and the common section through the lifting platform, and finally finishing the installation of the folding section by utilizing a reverse pulling system. The purpose of this patent is solved and uses the approach bridge as the condition of lifting by crane the passageway and adopt the support formula to lift by crane the platform, folds section below space inadequately, need carry out the problem that talent in a certain field can accomplish to the end section and fold. The method is mainly used for installing the closure section of the suspension bridge.

Inventors

LI ZHAO
ZENG BO
YAO GANG
ZHANG XIANGCHUAN
QIN GUIFANG
LIU ZHENG
Jiang Yuangen
XIE QINJIAN
ZHANG JIYONG
LIANG WEI
LI ZHENGJIE

Assignees

贵州路桥集团有限公司

Dates

Publication Date: 20260505
Application Date: 20251224

Claims (5)

1. The method for installing the closure section of the suspension bridge is characterized by comprising the following steps of: Step 1, beam fields are arranged on two sides of a suspension bridge, and an approach bridge is used as a transport Liang Tongdao; step 2, erecting a supporting platform by adopting a bracket method, wherein the supporting platform and the steel truss girder of the end section form a lifting platform together, and a jacking cylinder is arranged at the top of the supporting platform bracket to adjust the height of the lifting platform; step 3, hoisting the closure section through a hoisting platform, and suspending the closure section steel truss girder on a main cable by adopting a temporary sling; the end section steel truss girder at the top of the lifting platform is adjusted to a height corresponding to the anchor point of the permanent suspender through a jacking oil cylinder, and the connection between the end section steel truss girder and the permanent suspender is completed; Step 5, removing temporary slings, lifting the folding section steel truss girder by a cable, and temporarily hinging the folding section steel truss girder with the adjacent common section steel truss girder; And 6, enabling the end section steel truss girder to move back to the folding section steel truss girder by using a reverse pulling system, and finally connecting the end section steel truss girder with the folding section steel truss girder to finish folding.
2. The method for installing the closure segments of the suspension bridge according to claim 1, wherein the hoisting platform comprises the steps of transporting the first end section steel truss girder to a tower column through a bridge approach by a girder transporting trolley, hoisting the first end section steel truss girder to a sliding groove of a supporting platform through a crane on the bridge approach, transporting the second end section steel truss girder to the first end section steel truss girder through the bridge approach by a girder transporting trolley, hoisting the second end section steel truss girder to the sliding groove of the supporting platform through a crane on the first end section steel truss girder, hinging the upper chord rods on the adjacent sides of the first end section steel truss girder and the second end section steel truss girder together, and combining the end section steel girder and the supporting platform to form the hoisting platform of the subsequent steel truss girder.
3. The method for installing the closure segment of the suspension bridge according to claim 1, wherein two ends of the cable lifting system are fixed on anchors on two sides of the suspension bridge, the cable supporting point is positioned at the top of the tower column, the cable is suspended above the main cable, and a cable crane is arranged on the cable and is used for lifting and transporting the steel truss girder through the cable crane.
4. The method for installing a closure segment of a suspension bridge as claimed in claim 2, wherein the girder transporting trolley is turnable by 360 degrees.
5. The method for installing a closure segment of a suspension bridge of claim 1, wherein four jacking cylinders and a plurality of temporary buttresses are uniformly distributed on the top of the supporting platform.

Description

Method for installing closure section of suspension bridge Technical Field The invention relates to the technical field of suspension bridge construction, in particular to a method for installing a closure section of a suspension bridge. Background The suspension bridge is used as a main form of a large-span bridge, a stiffening girder of the suspension bridge is generally constructed by sectionally hoisting, and two side girder bodies are finally connected into a whole through a folding section. The installation precision of the closure section is critical to the linear control of the bridge and the stress state of the structure, and the accurate matching of the interfaces is required to be realized under the influence of complicated main cable linear change and temperature, so that the method is a key technical challenge for the construction of the suspension bridge. At present, a bracket method is mainly adopted for installing the closure section of the suspension bridge, and a swinging method is also adopted when the closure section is limited by site conditions. The mountain suspension bridge is limited by geographical conditions and is required to be environment-friendly, and an approach bridge is generally used as a beam transportation channel, so that the beam transportation channel is prevented from being repaired additionally. And the approach bridge is used as a beam transporting channel, a lifting platform is required to be built at one side of the approach bridge, which is close to the midspan of the bridge, otherwise, the approach bridge is limited by a cable crane walking area, and a swinging method is required to lift the steel beam. The construction method for hoisting the stiffening girder of the suspension bridge by walking with the beam of the cross-cable crane disclosed in the published patent document CN105839537B is to utilize the approach bridge as a girder transporting channel and build a hoisting platform to finish the hoisting work of the steel girder, but the hoisting platform is supported in a cable-stayed mode. The inclined pull type lifting platform needs to be pre-embedded with inclined pull ropes, which can damage the main tower structure to a certain extent and ensure the reliability to be further verified, and meanwhile, the inclined pull ropes can limit the space above the lifting platform to a certain extent, so that the inclined pull type lifting platform adopts a rotary lifting appliance. The cradle style lifting platform remains the mainstream choice. When the closure segments are closed, the closure segments can not be placed in the space between the lifting platform and the suspended midspan segment due to error accumulation and temperature-induced changes, and then the end head segment above the lifting platform needs to be moved to the approach bridge side. Therefore, how to pre-bias the end head section and complete the folding of the folding section is a technical problem to be solved by the scheme. Disclosure of Invention Aiming at the defects of the prior art, the invention solves the technical problems that under the condition that an approach bridge is used as a lifting channel and a bracket type lifting platform is adopted, the space below a folding section is insufficient, and the folding can be completed by pre-talent in a certain field of a steel truss girder at an end section. In order to solve the problems, the technical scheme adopted by the invention is that the method for installing the closure section of the suspension bridge comprises the following steps: And 1, arranging beam fields on two sides of a suspension bridge and taking an approach bridge as a beam transporting channel. And 2, erecting a supporting platform by adopting a bracket method, forming a lifting platform together with the steel truss girder of the end section, arranging a jacking cylinder at the top of the supporting platform bracket to adjust the height of the lifting platform, and gradually completing lifting and hanging of the middle section and the common section from the middle to two sides of the suspension bridge by adopting a non-rotating lifting appliance in a cable lifting system. And 3, hoisting the closure section through a hoisting platform, and suspending the closure section steel truss girder on the main cable by adopting a temporary sling. And 4, adjusting the end section steel truss girder at the top of the lifting platform to a height corresponding to the anchor point of the permanent suspender through a jacking oil cylinder, and completing connection of the end section steel truss girder and the permanent suspender, wherein a reverse pulling system is arranged below the end section steel truss girder close to the bridge approach, and the end section steel truss girder at the bridge approach side is pulled towards the bridge approach side so as to increase the distance between the end section steel truss girder and the common section steel truss girder. And 5,