Simply-supported-continuous large full-span box girder with medium-lower-speed maglev double lines and construction method

Abstract

The invention discloses a simply-supported-continuous large full-span box girder with medium-lower-speed maglev double lines. The simply-supported-continuous large full-span box girder comprises sidehole girders arranged at two ends of a route and a plurality of middle hole girders arranged between the side hole girders, wherein the side hole girders and the middle hole girders are of a concentric-squares-shaped cross-section structure, and the two sides of the top surfaces of the side hole girders and the middle hole girders extend outwards to form bridge wing plates; each side hole girder comprises a side hole girder concrete girder (1), and side hole girder simply-supported-continuous longitudinal pre-stressed tendons (3) are arranged on the upper edges of the ends, adjacent to the middle hole girders, of the side hole girder concrete girders (1); and each the middle hole girder comprises a middle hole girder concrete girder (6), and middle hole girder simply-supported-continuous longitudinal pre-stressed tendons (8) are arranged on the upper edges of the two ends of the middle hole girder concrete girders (6). The invention further discloses a construction method of the simply-supported-continuous large full-span box girder. According to the simply-supported-continuous large full-span box girder, simply-supported girders of a regular and standard span medium-lower-speed maglev bridge structure is changed to simply-supported-continuous girders, and the break angle rail surface irregularity, formed along with bridge deformation, of girder seam positions of two adjacent spans of simply-supported girders is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of medium and low-speed maglev rail transit, and more specifically relates to a large box girder with medium and low-speed maglev double-track simply supported first and then continuous whole hole and a construction method thereof. Background technique [0002] The medium and low-speed maglev rail transit adopts the suspension and guidance technology of the constant electromagnet suction type, and realizes the suspension and guidance of the vehicle through the electromagnetic attraction between the U-shaped electromagnet on the suspension frame of the vehicle and the F-shaped steel rail. [0003] At present, the conventional standard-span bridge structure of medium and low speed maglev generally adopts simply supported beams with a span of 20-40m. The layout of the prefabricated full-hole large box girder is then equipped with a rail support platform. Generally, after the construction of the bridge structur...

AI Technical Summary

Problems solved by technology

However, the slotted track generally used in medium and low-speed maglev transportation, that is, the track is not continuous. Once the discontinuous track is deformed at the knuckle angle, it will reduce or limit the passability of the suspension frame. Excessive knuckle deformation may even make the suspension The frame hits the track and gets stuck on the track, such as figure 1 shown

If the conventional standard-span bridge structure adopts simply supported beams, when the simply supported beams bend downward, a knuckle will be formed at the beam joints of two adjacent simply supported beams, and the track on the bridge will also be knuckled due to the deformation of the bridge. Deformation, when the knuckle angle is large, it may affect the passing capacity of the suspension frame of the maglev train, and the suspension frame is prone to large fluctuations at the knuckle position of the rail surface, which affects the ride comfort of the vehicle

In addition, the simply supported beam used in conventional standard span bridge structures in the prior art is not conducive to the passage of the suspension frame and affects the ride comfort of the vehicle. More building materials lead to increased investment, and the appearance is also relatively clumsy, which affects the beauty of the bridge

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