A Construction Technology of Segmentally Assembled Box Girder

Abstract

The invention discloses a construction technique for segmentally assembled box girders. The box girder to be constructed is a perforated girder, and each perforated girder is composed of a plurality of box girder segments assembled from the back to the front; As follows: 1. Prefabrication of box girder segments: Centrally prefabricate all box girder segments used to form the box girder to be constructed in the prefabrication yard; 2. Transport of box girder segments: transport all box girder segments to The erection position of the box girder under construction; 3. Box girder erection: use the descending bridge erecting machine to erect the constructed box girder. The descending bridge erecting machine includes the bottom horizontal support system, main girder system, longitudinal movement system, cantilever Cranes, assembly racks and assembly vehicles; 4. System conversion: system conversion will be carried out after the erection construction process is completed. The invention has the advantages of simple process steps, reasonable design, convenient construction, easy control of the construction process, good use effect, simple and rapid completion of the construction process of segmental assembled box girders, and easy guarantee of construction quality.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction technique for segmentally assembled box girders. Background technique [0002] With the development of society, the bridge construction technology is not only innovating, the segmental assembled box girder construction has gradually become a kind of construction due to its advantages of fast construction speed, high degree of industrialization, high degree of automation, improved labor efficiency and strong environmental adaptability. The new construction technology, and the erection accuracy requirements of segmental assembled box girders are also greatly improved. [0003] The Second Wuhu Yangtze River Highway Bridge starts from Shijian, Wuwei County, Wuhu City, connects the North Yanjiang Expressway, passes through Cangtou and Dougou, crosses the Yangtze River at Jitou Mountain, ends at Fanchang Eshan, and connects with the completed Wuhu...

AI Technical Summary

Problems solved by technology

Compared with the downward type bridge erecting machine, the upward type bridge erection machine has the advantages of no need to lay running tracks, large lifting height, and convenient installation. However, the upward type bridge erection machine has the following defects: First, the overall installation height is high and stable Second, the requirements for the substructure of the bridge are high, specifically for the pier body structure of the bridge to be constructed, so as to meet the requirements of stability and support; third, the erection process is relatively complicated, and the pier needs to be installed in advance The top beam should be transported backwards, and the assembly sequence of the head and tail spans should be considered; fourth, the visibility of the girder section assembly process of the upward bridge erecting machine is poor, the assembly accuracy is not easy to control, and the linear adjustment is difficult

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