Laser Intelligent Response Tunnel Convergence Monitoring System and Measurement Method

Abstract

The invention discloses a monitoring system and measuring method for laser intelligent response type tunnel convergence. The method comprises the following steps that firstly, a laser intelligent response type tunnel convergence monitoring instrument fixing support is manufactured to enable the laser direction of a laser range finder to align with the other side wall of a tunnel, and a monitoring instrument is made to be in a horizontal state by observing the angle indication of a two-dimensional inclinometer on the monitoring instrument; secondly, the number of intelligent reflection inductors is determined according to the number of measuring points needing to be measured, and the intelligent reflection inductors are fixed at the positions needing to be measured; thirdly, the initial positions of the measuring points are predefined; fourthly, working measuring is carried out. According to the monitoring system and measuring method, the special intelligent reflection inductors, a measuring instrument with a microprocessor and a high-precision rotation mechanism are adopted, one measuring device is enough to finish automatic measuring on the size and changing data of crown settlement and horizontal convergence quantity of multiple measuring points in a certain area at a time, and the measuring result is accurate; timing and period monitoring can be automatically finished by setting the system monitoring period, and the measuring data can be automatically stored.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering measurement, and in particular relates to a laser intelligent response tunnel convergence monitoring system and a measurement method. Background technique [0002] Tunnel convergence measurement is a must-measure item in the construction of shotcrete anchor construction method. After tunnel excavation, the surrounding rock stress will be redistributed. During the excavation process, the surrounding rock and support will be deformed, which is the most direct reflection of the changes in the mechanical behavior of the surrounding rock and support. When the surrounding rock stress tends to be balanced, the surrounding deformation tends to be stable, and this change process is called "convergence". The convergence of the inner surface of the tunnel can be measured by special measuring instruments. Through the observation of the surrounding displacement, the size and development of the va...

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Problems solved by technology

However, the cost of the system is relatively high, and the installation of monitoring points is also very complicated.

[0005] 2. Use convergence measurement to measure the convergence of the inner space of the tunnel: its characteristic is that it can complete the measurement of the deformation of the horizontal distance between two points on the tunnel wall, the measurement of the sinking of the vault and the displacement of the floor uplift, etc. The accuracy of this measurement method is reliable , but this method has shortcomings such as small measurement data, difficult operation, and high labor intensity. For large-section tunnels, it is necessary to work on a platform truck, and the operation is relatively inconvenient.

[0008] According to the existing data, the current laser measurement of the tunnel section is mainly for the measurement of the convergence value of a single section of the tunnel, which cannot fully reflect the convergence of a certain section of the tunnel.

In addition, the existing laser measurement equipment usually adopts the method of direct laser irradiation or installing reflective prisms and reflective sheets at the measured point. The direct laser irradiation method has a poor reflection effect due to the different materials of the measured surface, which has a greater impact on the measurement accuracy. Large; the method of installing reflective prisms and reflective sheets can only passively receive laser beams. When the original position of the installed reflective prisms and reflective sheets changes as the tunnel converges and deforms, ordinary laser rangefinders cannot automatically find reflective prisms, reflective sheets, etc. The position of the reflective sheet after deformation, resulting in inaccurate measurement and decreased accuracy

[0009] In short, the above four measurement methods for tunnel convergence still have their own defects, and it is difficult to truly meet the requirements for the accuracy, authenticity, real-time and convenience of tunnel convergence data measurement

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