Steel box arch bridge single arch rib framing swivel system and construction method thereof

Abstract

The invention belongs to the technical field of bridge construction, and relates to a steel box arch bridge single arch rib framing swivel system and a construction method thereof. The system comprises a lower rotary disc located on a foundation, a horizontal swivel system fixedly installed on the lower rotary disc, an upper rotary disc rotationally installed on the horizontal swivel system and atraction system detachably connected with the upper rotary disc; a vertical rotating system comprises a vertical rotating hinge installed on the inner side of the upper rotating disc and used for fixing an arch rib to be assembled, a buckle cable installed on the outer side of the upper rotating disc, a buckle tower installed on the upper rotating disc and a rear anchor system fixedly installed onthe outer side of the upper rotating disc and used for balancing the upper rotating disc. The buckle cable comprises a lower buckle cable connected between the upper rotary disc and the buckle towerand an upper buckle cable connected between the buckle tower and the free end of the arch rib to be assembled, a plurality of balance cables are installed between the inner side of the upper portion of the buckle tower and the outer side of the upper rotary disc, the construction method guarantees the construction quality of the arch bridge, safety risks are reduced, construction is convenient, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and relates to a steel box arch bridge single arch rib framing swivel system and a construction method thereof. Background technique [0002] With the application of steel structures on various bridges, the spanning capacity of the bridge is greatly improved, and the stability of the bridge load-bearing structure is increased. The steel box arch is favored by bridge designers for its super strong spanning capacity. However, the mountainous terrain is complex and subject to various factors such as topography, climate, geology and hydrology, the construction of arch bridges faces many difficulties. Common construction methods for arch bridges include cable hoisting and swivel construction. Among them, the construction technology of the cable-stayed buckle-hanging method of cable hoisting is relatively mature and reliable. However, for Quaternary soil layers, strongly weathered and broke...

AI Technical Summary

Problems solved by technology

Among them, the construction technology of the cable-stayed buckle-hanging method of cable hoisting is relatively mature and reliable. However, for Quaternary soil layers, strongly weathered and broken strata, and areas with relatively developed karst, the bearing capacity of the foundation is low. The layout is difficult; or due to terrain restrictions, there is a problem that the distance between the anchor spindle and the buckle tower is too short or too long, which affects the force of the cable crane system; the cable hoisting high-altitude operation has a long construction period and high safety risks

In the traditional whole swivel construction method, the abutment is located on a steep mountain slope, and the construction of the whole swivel abutment requires a large amount of excavation and difficult protection, which affects the stability of the mountain and easily induces geological disasters; the height difference between the left and right arch ribs corresponds to the ground line Larger, higher brackets need to be erected to assemble the arch ribs; the foundation of the lower turntable ring is large, and the upper turntable needs to add connecting beams between the arch seats, which requires a large amount of materials

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