Construction method of a prevention and control device for ballastless track tunnel bottom deformation

Abstract

The invention discloses a prevention and control device for ballastless track tunnel bottom deformation and a construction method thereof. The prevention and control device is characterized in that after an inverted arch filling layer is constructed, before a roadbed slab is laid, a plurality of vertical drill holes are vertically punched at the tunnel bottom surrounding rock from the inverted arch filling layer, and supporting tubes are arranged on the inner walls of the vertical drill holes; the construction method comprises the steps that after the inverted arch filling layer is constructed, before the roadbed slab is laid, the vertical drill holes are vertically punched into the tunnel bottom surrounding rock from the inverted arch filling layer; the supporting tubes are laid on the inner walls of the vertical drill holes; strain gauges are arranged on the supporting tubes, periodic detection is performed; when the stress result of the strain gauges tends to be stable, grouting andsealing are performed on the vertical drill holes. The deformable and stress relief space is provided for the tunnel bottom surrounding rock in the tunnel construction stage, after the tunnel bottomdeformation tends to be stable, the roadbed slab is laid, the laid roadbed slab can prevent the tunnel bottom from arching up to the great extent, and the remediation and maintenance cost for later-period tunnel bottom arching can be greatly saved.

Description

technical field [0001] The invention relates to the technical field of railway engineering construction, in particular to a construction method of a prevention and control device for ballastless track tunnel bottom deformation. Background technique [0002] High-speed railways have extremely high requirements on track smoothness. If the track smoothness is poor, it will cause severe vibration of the rolling stock, and the force of the wheel and rail action will double, which will seriously damage the track and rolling stock components, affect the increase of train speed, and even easily cause the train to derail. Overturned, endangering driving safety. At present, my country's high-speed railways all adopt the ballastless track type. When the ballastless track is laid in the tunnel, the excavation of the tunnel destroys the original stress balance state of the surrounding rock at the bottom of the tunnel, and the surrounding rock at the bottom of the tunnel needs to go throu...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiency that the smoothness of the line cannot be guaranteed when the upward arch deformation of the bottom of the track tunnel is greater than the maximum adjustment amount of the fastener when the fastener is used for adjustment in the prior art, and provides a Construction method of prevention and control device for ballastless track tunnel bottom deformation

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