High-speed railway large-diameter shield tunnel overhead line system channel construction method

Abstract

The invention provides a high-speed railway large-diameter shield tunnel overhead line system channel construction method. A channel mechanism is made and installed to a pipe piece. A wedge-shaped ring pipe piece is adopted as the pipe piece. The point position for installing the pipe piece is selected according to the shield tail clearance distance. When shield driving is conducted to the presetlength and the stroke of a thrust oil cylinder in the position where a capping block is planned for installation is larger than the preset stroke length, a shield tunneling machine stops driving, andthe pipe piece is installed. After installed in place, a pipe piece block stretches out to a corresponding position, the thrust oil cylinder of a pipe piece installation machine pushes the pipe piecetightly, pushing force of the thrust oil cylinder is higher than preset stress needed by pipe piece stabilization, and then the pipe piece installation machine is moved away. After a pipe piece ring is separated from a shield tail, a pipe piece connection bolt is fastened for the second time. Through the construction method, construction environment during installation of an electrical system is improved significantly, installation construction efficiency of an electromechanical system is improved, a tunnel structure is not damaged basically, and the structure service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of high-speed railway tunnel construction, in particular to a method for constructing catenary channels in large-diameter shield tunnels for high-speed railways. Background technique [0002] Urban rail transit has been widely used. When laying urban rail transit, the catenary construction method of large-diameter railway shield tunnel is generally adopted. This construction method adopts the combination of hole extraction + chemical anchor bolt + support and hanger. The construction efficiency is low, the working environment is harsh, and the segments are easily damaged to cause hidden damage. [0003] The channel construction method avoids the above disadvantages. Compared with the original post-anchor bolt construction method, the channel technology has the advantages of low pollution, high work efficiency, low cost, and high integrity of the segment. [0004] Several channel construction methods commonl...

AI Technical Summary

Problems solved by technology

This method can avoid the mutual interference between the anchor and the steel cage, but because of the need to open reserved holes on the channel and the formwork, first, it will have a certain impact on the overall strength of the channel; second, the production of non-channel segments is due to the formwork holes The reasons for this have an impact on the quality; the third is that the plugging of the formwork holes is generally electric welding, which is easy to cause warping and deformation of the formwork and affect the assembly quality of the segments

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