A shield tunnel segment longitudinal prestressed reinforcement structure and construction method

Abstract

The invention discloses a longitudinal prestress strengthening structure for shield tunnel segments and a construction method. The longitudinal prestress strengthening structure comprises fixed end segments, a plurality of interval segments and a plurality of joint segments, wherein at the end part, the fixed end segments are in contact with the interval segments, and the fixed end segments, the interval segments and the joint segments are connected through the same prestress connecting piece; inside, the interval segments and the joint segments are arranged at intervals, and the joint segments, the interval segments and the joint segments are connected through the same prestress connecting piece. According to the longitudinal prestress strengthening structure, the shield segments are connected into a whole in the vertical direction, so that the longitudinal differential settlement resistance of a tunnel is improved, longitudinal distortion and deformation of the tunnel are restricted, and the overall strength of the shield tunnel segments is equivalently improved. The stress between the segments can be better maintained through extruding the shield segments, so that the segments are prevented from stretching or wrong lifting, the impermeability of gaps between the adjacent segments is improved, and water seepage and clay leakage of the tunnel are effectively controlled.

Description

technical field [0001] The invention relates to a method for setting prestressing force between laid longitudinal tube segments during the construction of shield segment segments, relates to rail transit and tunnel technologies, and belongs to the field of engineering technology. Background technique [0002] With the rapid development of my country's economy, the transportation industry is also booming, and the proportion of hill tunnels, river-crossing tunnels, urban subways and other projects in the transportation industry is increasing year by year. During the late operation of the shield tunnel, the vibration load caused by the operation of the vehicle and the uneven load caused by the bad ground will cause uneven settlement of the tunnel in the longitudinal direction, which will induce dislocation between adjacent ring segments or even segment fracture. This will lead to water seepage and mud leakage in the tunnel or distortion and deformation of the subway track, shor...

AI Technical Summary

Problems solved by technology

Chinese patent 201410048582.0 discloses a method for preparing longitudinal prestressed concrete lining segments of shield tunnels, by embedding hole-making devices at predetermined positions on the connecting blocks, standard blocks, and arch bottom blocks of the lining ring in each group of circulation intervals. Make tunnels, insert prestressed steel strands in the tunnels, and ensure that the two types of anchor rings of the arch bottom block are staggered in two intervals. The similar anchor ring becomes a weak link, and the effect of this patent cannot form a uniform prestress on the entire shield ring

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