Cantilever end control device and control method for towing construction of curved light I-beam bridge

Abstract

The invention discloses a cantilever end control device and a control method for towing construction of a curved light-weight I-beam bridge. The device comprises a tower, a cable and a short nose bridge; A tower is installed on each longitudinal I-beam of the I-beam, and the tower is located at the middle beam two spans in front of the I-beam pulling direction; one end of the stay cable is connected with a short nose beam through a connector, the middle part is erected on the top end of the tower, and the other end is connected with a cross beam of an adjacent span of the connected tower through a connector; the short nose beam is arranged at the front cantilever end in the pulling direction of the i-beam. The combined method of short nose beam and cable can fully adapt to the characteristics of light dead weight and curved alignment of I-beam bridge, and solve the problems that the conventional long guide beam cannot meet the requirements of the downward deflection of the cantilever end and the inherent torsional deformation of the curved beam end in the whole dragging process.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a cantilever end control device and a control method for drag construction of a curved light-duty I-shaped steel girder bridge. Background technique [0002] The guide girders used in the dragging construction of existing girder bridges are mostly longer steel guide girders, with a length of about 0.7 times the single-span span, which has a good effect on improving the mechanical properties of the bridge dragging process and lifting the front fulcrum. However, if the beam body is a light curved I-beam, the self-weight of the conventional steel guide beam is almost the same as that of the beam body. At this time, the advantage of light weight and high strength of the steel guide beam compared with the concrete beam, steel box girder and other heavy beams is no longer Existence, the large deflection of the cantilever end of the main beam and the difficulty of reducing th...

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Problems solved by technology

However, if the beam body is a light curved I-beam, the self-weight of the conventional steel guide beam is almost the same as that of the beam body. At this time, the advantage of light weight and high strength of the steel guide beam compared with the concrete beam, steel box girder and other heavy beams is no longer Existence, the large deflection of the cantilever end of the main beam and the difficulty of reducing the negative bending moment of the fulcrum of the beam body lead to the problems of large internal force in the section of the beam body and difficulty in passing the pier during the construction process

Especially for curved light-weight I-beam bridges, due to the inherent bending-torsion coupling effect of the curved beam structure itself during the dragging process, the deformation of the inner and outer ends of the beam end is inconsistent and cannot be at the same elevation, which is difficult to solve by the conventional beam guide method

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