Construction method for solving cross construction of horseshoe-shaped tunnels

Abstract

The invention provides a construction method for solving cross construction of horseshoe-shaped tunnels, which is used for carrying out mechanical calculation on vertical legs of a trolley portal frame and comprises the following steps: 1) drawing a stress diagram, and finding out or reckoning a calculation formula that the maximum bending moment appears at a fixed end and a calculation formula that the maximum deflection appears at a free end; 2) calculating the sum of the side pressure of the poured concrete and the side pressure of vibration during construction; 3) measuring the effective height and the vertical leg spacing of the trolley vertical legs; 4) calculating inertia moment data, and normalizing the surface load of the trolley into the linear load of the vertical legs; 5) checking the maximum deflection specification of the steel structure, and checking the deformation specification of the hydraulic concrete formwork; and 6) calculating the deflection of the free end of thevertical leg, and comparing the deflection with data in the specification to determine whether an end cross arm is needed or not. According to the method, maximum value estimation is carried out on the deflection of the ends of the vertical legs of the portal frame in a mechanical mode, horizontal cross braces of the vertical legs are removed on the basis, and convenience of a construction channel is guaranteed.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a construction method for solving cross construction of horseshoe-shaped tunnels. Background technique [0002] Most of the existing tunnel side arch concrete lining adopts the method of adding cross braces to the legs of the trolley door frame to avoid large deflection deformation when the legs are under a large force, which is the safest way. [0003] However, this method blocks the passage of the road at the lower part of the gate frame, which is unfavorable for tunnel construction when there are cross operations. Contents of the invention [0004] The purpose of the present invention is to address the deficiencies of the prior art, thereby providing a mechanical method to estimate the maximum value of the deflection of the end of the vertical leg of the door frame, and use this as a basis to judge whether the horizontal cross brace of the vertical leg can be remo...

AI Technical Summary

Problems solved by technology

[0003] However, this method blocks the passage of the road at the lower part of the door frame, which is unfavorable to tunnel construction when there are cross operations.

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