Method for measuring tunneling construction precision at two ends of extra-long tunnel

Abstract

The invention discloses a method for measuring tunneling construction precision at two ends of an extra-long tunnel. The method comprises the following steps: rechecking and encrypting mapping base points arranged in the whole route according to the present coordinate control point and benchmark data; using double-frequency receivers for collecting field data of horizontal control points, and synchronously starting up and collecting satellite signals under the condition of strictly centering and leveling; synchronously observing at different horizontal control points by multiple receivers, moving to other horizontal control points for synchronously observing after finishing the synchronous observation in a period of time, and forming a synchronous pattern while synchronously observing at each time. During the measuring process, different synchronous patterns are generally connected by a plurality of common points; the whole GPS network is formed by the synchronous patterns; measuring points are uniformly distributed in a control network, have a mutual restraining effect to the whole control network and can effectively increase the measuring precision.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for measuring the construction accuracy of excavation at both ends of an extra-long tunnel. Background technique [0002] Due to the long line of tunnels in mountainous areas, passing through high mountains, and large terrain fluctuations, during the excavation construction at both ends, it is impossible to accurately retest and check the plane control network at both ends according to conventional measurement methods, which may lead to tunnel excavation in opposite directions. The increase of the error directly affects the accurate penetration of the tunnel. [0003] Therefore, it is important to study the retesting and checking methods of the planar control network at both ends of the tunnel to ensure the high precision and high reliability of the control network, ensure the consistency of the tunnel and the line position, and improve the measurement accura...

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the technical problems in the prior art that conventional measurement means cannot accurately retest and check the plane control network at both ends, which leads to an increase in the penetration error of the opposite excavation of the tunnel and directly affects the accurate penetration of the tunnel, and provides special features Measurement method of excavation construction accuracy at both ends of tunnel

This research method is applicable to the measurement accuracy control of double-end excavation construction of various extra-long tunnels under various terrain environments.

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