SteeL-UHPC combination beam for cabLe-stayed bridge and construction method

Abstract

The invention reLates to a steeL-UHPC combination beam for a cabLe-stayed bridge. The combination beam comprises two main LongitudinaL beam bodies arranged in paraLLeL, two or more horizontaL beam bodies connected with the main LongitudinaL beam bodies and two or more UHPC prefabricated pLates, and aLL the horizontaL beam bodies are LongitudinaLLy and evenLy distributed between the two LongitudinaL beam bodies; the middLes of the adjacent horizontaL beam bodies are connected with middLe LongitudinaL beam bodies, the main LongitudinaL beam bodies, the middLe LongitudinaL beam bodies and the twoadjacent horizontaL beam bodies are matched to form a steeL beam grid, and the prefabricated pLates are erected on the steeL beam grid; LongitudinaL UHPC cast-in-situ bands are arranged on the main LongitudinaL beam bodies and the middLe LongitudinaL beam bodies, horizontaL UHPC cast-in-situ bands are arranged on the horizontaL beam bodies, and cast-in-situ band reinforcements and shear parts arearranged in aLL the cast-in-situ bands; prefabricated pLate reinforcements are arranged in the prefabricated pLates, the two ends of each prefabricated pLate reinforcement extend out of the corresponding prefabricated pLate and are connected with the corresponding cast-in-situ band reinforcements, and the shear parts are connected with the corresponding steeL beam bodies. A construction method ofthe combination beam comprises the steps of machining of steeL components and prefabricated pLates and the Like. The combination beam is good in performance, Low in construction cost, high in construction condition adaptabiLity and beneficiaL to Larger-span deveLopment of the cabLe-stayed bridge.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a steel-UHPC composite beam used for a cable-stayed bridge and a construction method. Background technique [0002] A cable-stayed bridge is a bridge with a cable-supported system, that is, a number of oblique cables are used to support the main girder on the cable tower to cross obstacles such as larger river valleys. The stay cables act as multi-point elastic supports for the main girder, which greatly reduces the internal bending moment of the girder and the size of the girder body, and significantly increases the spanning capacity. The wind resistance stability of the cable-stayed bridge is better than that of the suspension bridge, the landscape effect is better, the construction technology is mature, and the cost is economical. It has good applicability to the span of 300-1000m, and it is the main bridge type used by long-span bridges. [0003] The main girder o...

AI Technical Summary

Problems solved by technology

The flat box steel-UHPC composite beam must be hoisted as a whole, which is not conducive to the application in mountainous areas and other environments with poor construction conditions

In addition, the mechanical properties of wet joints of UHPC materials are the key factors affecting its application, and the traditional rectangular joints' mechanical properties and crack resistance cannot meet the requirements

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