A method for adjusting propulsion hydraulic cylinder to realize anti-eccentric load of rectangular shield

Abstract

The invention discloses a thrust hydraulic cylinder adjusting method capable of realizing unbalance loading resistance of a rectangular shield. Based on a stress model of the rectangular shield in the tunneling process, according to the measured magnitude of thrust of each thrust hydraulic cylinder, resultant external resistance torque of external loads acted on the shield is reversely derived; a line in a direction perpendicular to the resultant external resistance torque is defined as a layout position line; the positions of the hydraulic cylinders on two edges of the diagonal point with the shortest travel from the layout position line in the rectangular shield are adjusted, that is, the hydraulic cylinders on the adjacent long and short edges of the rectangular diagonal point are adjusted, and the positions of the two hydraulic cylinders are nearest the diagonal point, so that the optimal layout of the hydraulic cylinders of a shield propelling system is realized; and finally, the thrust value of each hydraulic cylinder is the same, so that the force of the hydraulic cylinders acted on pipe pieces is uniform, the destruction of the pipe pieces is prevented, and the unbalance loading phenomenon of the shield caused by the geological condition difference or self weight and turning loads is solved.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, and in particular relates to a method for adjusting a propulsion hydraulic cylinder for realizing anti-eccentric load of a rectangular shield. Background technique [0002] The rectangular shield propulsion system is a key component of the rectangular shield, which mainly undertakes the excavation task of the entire shield. However, none of the existing propulsion systems can solve the eccentric load phenomenon caused by the special geological conditions or self-weight of the shield, and the external direction-changing load. Excessive eccentric loads will cause the segment to be crushed, resulting in water leakage from the segment, and eventually It affects the construction quality of the tunnel; in the prior art, the adjustment method for the external eccentric load needs to adjust all the hydraulic cylinders, and adjusting the positions of all the hydraulic cylinders at one time is not...

AI Technical Summary

Problems solved by technology

However, none of the existing propulsion systems can solve the eccentric load phenomenon caused by the special geological conditions or self-weight of the shield, and the external direction-changing load. Excessive eccentric loads will cause the segments to be crushed, resulting in water leakage from the segments, and eventually Affects the construction quality of the tunnel; the existing method of adjusting the external eccentric load requires adjusting all hydraulic cylinders, and adjusting the positions of all hydraulic cylinders at one time is not only difficult to adjust, but also low in efficiency

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