Sling converting once tensioning construction method of rope bridge system

Abstract

The invention discloses a sling converting once tensioning construction method of a rope bridge system. The method comprises the steps of establishing a construction phase simulation analysis model of a rope bridge by utilizing finite element finite element, determining the number and arrangement positions of required temporary piers preliminarily, and determining the tensioning sequence of slings preliminarily; installing the temporary piers at the preset positions; after the installation of the temporary piers is completed, installing a support and a first jack at the pier top of each permanent pier, and installing a second jack at the pier top of each temporary pier; setting up a main beam and rope system above the rope bridge; tensioning the slings through a method of rope length in non-stress, adjusting the top elevation of each first jack timely in the construction process, so that the construction stress of the slings or local stress of anchorage zones is reduced to the construction allowable stress, and tensioning of the slings to the designed sling length in one time; in the construction process, monitoring the elevation and stress level of the anchorage zones of the slings in real time, monitoring the elevation and stress level of the anchorage zones of the slings in the last phase timely, and if the stress is found to exceed standards, then repeating the fifth step.

Description

technical field [0001] The invention relates to the technical field of engineering construction, in particular to a construction method for a cable-type bridge system conversion suspension cable tensioning once in place. Background technique [0002] The basic principles of bridge design are: safety, applicability, economy, beauty and environmental protection. With the development of my country's economy and transportation, my country's bridge construction has entered a new period, and the requirements for bridges have also been further improved than before. [0003] Cable bridges have the advantages of strong spanning ability, beautiful appearance, reasonable force, and strong adaptability to terrain and geological conditions, and are more and more favored by engineering circles. Cable bridges include not only suspension bridges whose superstructure is dominated by tension members, but also cable-stayed bridges whose superstructure is mainly composed of compression members...

AI Technical Summary

Problems solved by technology

The graded tensioning method of cable force is similar to the cable adjustment of a cable-stayed bridge. The purpose is to achieve the final reasonable bridge state. The graded tensioning requires multiple cable adjustments, and the construction process is complicated; the unstressed cable length method can ignore the complex structure during the construction process. The sling is cut and constructed directly according to the design unstressed cable length, but the precondition of the unstressed cable length method is that the bridge components (mainly sling and anchorage area) must meet the safety reserve during construction, and when most cable bridges are constructed according to the unstressed cable length method, the stress during construction of the sling and anchorage area may exceed the safety reserve during construction. This greatly limits the application of the unstressed cable length method

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