Combined cast-in-place box girder support system and construction method

Abstract

The invention provides a combined cast-in-place box girder support system and a construction method. An upper hoop and a lower hoop are mounted on each middle pier of a bridge; a supporting rod is arranged between brackets of the upper hoop and the lower hoop; a steel pipe stand column is arranged close to each side pier of the bridge; the bottoms of the steel pipe stand columns are supported on aground concrete foundation; bearing cross beams are erected on the hoops and the tops of the steel pipe stand columns in a water flow direction; and bailey longitudinal beams are erected at the topsof the two bearing cross beams of each span in a bridge axis direction, distribution beams are erected on the bailey longitudinal beams in the water flow direction, full framing is installed on the distribution beams, and a cast-in-place box beam formwork system is installed at the top of the full framing. The method is suitable for geological conditions such as complex mountainous terrain conditions, high foundation treatment difficulty and high pier studs, and is simple in structure, low in material investment and high in safety.

Description

technical field [0001] The invention belongs to the technical field of cast-in-place box girder construction in bridge engineering, and specifically relates to a combined cast-in-place box girder support system and a construction method, which is especially suitable for on-site cast-in-place box girders with complex terrain conditions, difficult foundation treatment, and high pier columns in mountainous areas. Pouring box girder construction. Background technique [0002] At present, the commonly used construction supports of cast-in-place box girder mainly include full-wall supports and steel pipe supports. Full hall support has high safety, but it is only suitable for areas where there is no traffic requirement below, the pier height is within 15m, the foundation conditions are good, and the terrain is relatively flat; 1. Under weak geological conditions, the construction of the steel pipe column foundation is more difficult, which increases the construction cost. In addi...

AI Technical Summary

Problems solved by technology

The full hall support has high safety, but it is only suitable for areas where there is no traffic requirement below, the pier height is within 15m, the foundation condition is good, and the terrain is relatively flat; the steel pipe support can be applied as long as the clearance under the bridge can meet the erection requirements, but it can be used in steep terrain 1. Under weak geological conditions, the construction of the steel pipe column foundation is more difficult, which increases the construction cost. In addition, when the pier column is high, the erection of the steel pipe column is relatively high, the workload of high-altitude operations is large, the input of materials is large, and the construction risk is high.

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