Double line box girder downward mobile formwork bridge fabrication machine and construction method thereof

Abstract

The invention discloses a downlink-typed movable formwork bridge fabrication machine used for dual-line box girders in passenger-dedicated line (PDL) of railway and a construction method thereof. The main beam of the bridge fabrication machine adopts two parallel groups of left and right main truss structures; the front end and the rear end of each group of main truss are respectively connected with a front guiding beam and a rear guiding beam; the upper sides between the two main trusses are fixed and connected by a plurality of sway bracings and the lower sides are connected with a plurality of lower carrying-pole beams; a beam-hoisting machine which can move along the longitudinal direction of the main truss is erected above the main truss; the two main trusses are supported on the two adjacent piers by a longitudinal and transverse slide carriage. The construction method of the invention adopts precast segmental girders in beam fields beside a bridge; concrete is cast in-situ after the segmental girders are hoisted in position so as to connect the beam wetly; the construction sequences of assembling the whole-cell box girder, stretching and drawing a prestressed tendon of the whole-cell box girder are carried out, thus realizing that dual-line simply supported continuous box girder is erected simultaneously. The bridge fabrication machine and the construction method of the invention have the outstanding advantages of large load bearing capability, synchronous erection of dual-line, precise controlling of the line shape, and saving the construction period, etc.

Description

technical field [0001] The invention relates to a downward-moving formwork bridge-building machine for a double-line box girder of a railway passenger dedicated line and a construction method thereof. Background technique [0002] The concrete simply supported box girder of the long-span railway passenger dedicated line has a large load, and two lines need to be erected synchronously, and the alignment must be accurately controlled, and the construction period is short. The existing large-span and large-tonnage bridge-building machine technology is single-line erection. If it is used for double-line erection, it is necessary to first construct the first line of the double line, and then build the second line of the double line. Its disadvantage is that the single-line is changed to double-line, and the overall structure needs to be partially restructured, the workload of the restructure is large, and the reinforcement is difficult; because the construction period of the two ...

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Problems solved by technology

Its disadvantage is that the single-line is changed to double-line, and the overall structure needs to be partially restructured, the workload of the restructure is large, and the reinforcement is difficult; because the construction period of the two lines is inconsistent, the concrete setting period is different, and the shrinkage and creep deformation of the prestressed concrete is not coordinated. It is easy to generate additional internal force inside, and the linear control of the box girder is difficult; it is necessary to provide a large tonnage (100 tons) and a 50m high water gondola; after the first line beam is erected, it needs to move 72.5cm across the top of the pier to reach the design position , the high-altitude pier top moves horizontally with a large tonnage, and the safety risk is large; the bridge building machine needs to be assembled and disassembled twice, and the process is relatively complicated; the construction period is relatively long

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