A Reinforced Hole Based on Double-layer Traffic Concrete Box Girder Bridge Web

Abstract

The invention provides a concrete box girder bridge web reinforcing hole based on double-deck traffic. The technical scheme that a framework is formed in the manner that multiple stirrups are arranged on the periphery of the hole to be combined with and fixed to pull rods to form an annular frame or a strip frame, and then formwork erecting pouring molding is conducted is adopted. The defects that stress concentration is likely to happen in the box girder bridge web hole forming position, and consequently the overall stress performance of a box girder is greatly weakened are overcome. The concrete box girder bridge web reinforcing hole is suitable for being used as open holes of various closed box girder webs and particularly suitable for being used as large-diameter open holes of a concrete box girder bridge web for multi-deck traffic.

Description

technical field [0001] The invention relates to a reinforced hole based on the web plate of a double-layer traffic concrete box girder bridge. Background technique [0002] With the development of China's economy, urban land resources are becoming more and more tense. At the same time, the rapid growth of traffic flow has caused most of the built urban bridges to become increasingly congested. The existing urban bridges in the world are facing the sacred mission of sustainable development. Although widening the bridges can To alleviate the traffic flow, but it will face various problems such as the design and construction difficulties of building a wide bridge, large area and high cost. Therefore, in order to improve the traffic conditions of the bridge, the design of urban bridges with double-layer traffic or double-layer bridge decks is better. plan; the development of double-deck bridges can be divided into two stages, namely steel truss double-deck bridges and prestresse...

AI Technical Summary

Problems solved by technology

[0002] With the development of China's economy, urban land resources are becoming more and more tense. At the same time, the rapid growth of traffic flow has caused most of the built urban bridges to become increasingly congested. The existing urban bridges in the world are facing the sacred mission of sustainable development. Although widening the bridges can To alleviate the traffic flow, but it will face various problems such as the design and construction difficulties of building a wide bridge, large area and high cost. Therefore, in order to improve the traffic conditions of the bridge, the design of urban bridges with double-layer traffic or double-layer bridge decks is better. plan; the development of double-deck bridges can be divided into two stages, namely steel truss double-deck bridges and prestressed concrete box girder double-deck bridges; in comparison, the former technology is relatively mature, but the cost is higher, mainly due to Applied to cross-river and long-span bridges across rivers, good economic benefits have been achieved in terms of project investment; the latter structural form has all the advantages of the box girder structure, and it is more expensive for land use and more expensive. A single urban bridge with a small span of 30-60m is more practical; however, in order to meet the needs of ventilation, lighting, escape in emergency situations, and lighten the weight of the box girder inside the box girder bridge, the double-layer bridge of prestressed concrete box girder Some necessary holes must be opened at the web, which will greatly weaken the overall mechanical performance of the box girder, and will cause stress concentration and obvious reduction in strength and other unfavorable factors at the opening.

Images