Method for construction of multi-point integral top pulling steel case beam

Abstract

The invention discloses a construction method of a multi-point whole incremental launching steel box girder, which belongs to the field of bridge engineering. The construction method uses a dental plate with a tooth socket, which is arranged on a steel box girder and a guiding beam web plate, a jacking force is supplied by an incremental launching jack, wherein a piston rod of the incremental launching jack is equipped with a slider, on which a spinous block with an inclined plane and a control spring are arranged, the inclined plane is arranged on the side of the incremental launching jack, the steel box girder and the guiding beam are applied with the jacking force through the push travel of the incremental launching jack, and the spinous block withdraws from the tooth socket during the return to enter into a next push travel. The construction method also supplies the support and adjusts the elevation of corresponding points through lifting-up the jack, simultaneously the incremental launching jack and the upper portion of the incremental launching jack are all equipped with a displacement sensor and a pressure sensor to collect information, thereby controlling an incremental launching process. The construction method has less consumption of steel material, a support reaction and a thrust force are capable of being controlled, and the problem of the rotation angle of the steel box girder is capable of being excellently solved.

Description

(1) Technical field [0001] The invention belongs to the field of bridge engineering, and in particular relates to a construction method of multi-point integral jacking steel box girders. (2) Background technology [0002] Steel box girders are lighter than concrete girders, and are widely used in the construction of long-span cable-stayed bridges and suspension bridges at home and abroad. Due to the different structural forms of bridges, topographic conditions of bridge sites, shipping conditions, and transportation conditions, the erection methods are also different. At present, there are mainly bracket frame methods, temporary upsetting integral hanging method, cable-stayed cantilever assembly method, cable-loaded crane frame method, etc. Wherein the Intellectual Property Office of the People's Republic of China published on November 28, 2007 titled "A Steel Box Girder Erection Method Applied to Self-anchored Suspension Bridge", and the application number is 200710035272....

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the large amount of steel used and the heavy workload of the above technologies, and the poor synchronism and stability of the push and push, and the problem of the corner of the steel box girder cannot be well solved, the present invention provides a steel box with less steel used, and the supporting reaction force and thrust can be adjusted. control, and can well solve the steel box girder corner problem multi-point integral jacking steel box girder construction method

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