Underground tunnel virtual double-lead control measurement method

Abstract

The invention discloses an underground tunnel virtual double-lead control measurement method which comprises the following steps: in the underground tunnel engineering control and measurement process, selecting and burying one conventional branch lead according to most advantageous measurement conditions firstly, establishing virtual double leads inside the conventional branch lead in advance, and then performing field surveying and internal data processing by using a specific method strictly according to the established virtual double leads, thereby obtaining control point accomplishment of which the precision is equal to or even superior to that of conventional double leads. Therefore, underground tunnel lead control measurement has characteristics of flexibility and simplicity in arrangement and rapidness and convenience in measurement of the conventional branch lead, and high precision and high reliability of double leads, the problems that the underground tunnel lead control measurement site arrangement, measurement efficiency and measurement cost are conflicted with one another can be effectively solved, and the underground tunnel virtual double-lead control measurement method is wide in popularization prospect, can be used in various engineering control measurements, and particularly has remarkable advantages in control measurement in which the longer an underground tunnel is, the harder the measurement environment is.

Description

technical field [0001] The invention belongs to the field of engineering measurement, in particular to a virtual double-wire control measurement method for an underground tunnel. Background technique [0002] The control measurement of underground tunnel engineering is divided into two parts: the inside of the tunnel and the outside of the tunnel. The purpose of the control measurement is to ensure that the working faces of the opposite excavation of the underground tunnel can be correctly penetrated according to the specified accuracy, and to make the buildings built according to the design position and geometric shape. , does not invade the building boundary, and meets the acceptance accuracy requirements. All kinds of projects have corresponding measurement specifications that have strict regulations on penetration errors, and there are differences in different specifications. Take the high-speed railway project with high requirements for underground tunnel penetration as ...

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Problems solved by technology

[0009] The advantages of branch wire measurement are: simple layout, flexibility, and small measurement workload. The disadvantage is: due to the lack of checking conditions for branch wires, errors or gross errors in the process of observation or calculation cannot be found through checking, so only in It is used when the length of the underground tunnel is very short and the measurement accuracy is low.

[0011] The advantages of double-wire measurement are: it can greatly increase the redundant observations of the network, increase the closure check conditions of the wires, and improve the overall strength and accuracy of the network. At present, this method is used in the long-term underground tunnel plane control It is widely used in measurement, but its disadvantages are: it is difficult to select distribution points, and compared with the number of buried piles of branch wires, the measurement workload and measurement cost are doubled

[0012] In the past, the development of control measurement in underground tunnels was centered on instrument hardware and office data processing software. The development of instruments and software is now at a bottleneck, and it has become very difficult to develop further in a period of time. Due to its The location is special, the site in the tunnel is narrow, and satellite signals cannot be received, only wire measurement can be used. For decades, there has been no new measurement method to replace it. Therefore, in order to improve the overall accuracy and reliability of the network, we It is necessary to use the traditional two-conductor for long-term measurement. As we all know, the cost of control measurement in underground tunnels is mainly reflected in three aspects. However, to lay out double conductors in a narrow underground tunnel, it is necessary to ensure good visibility conditions, avoid obstacles, arrange conductor points in pairs and form a closed loop. It is not only very difficult to select points to bury piles, but also The quantity is large, and the cost of selecting points to bury the control network is high; in the field survey, when the preparation work is done, the actual measurement time of each station is relatively fixed, and there is not much difference in the measurement time for different operators. Most of the time spent on tunnel wire control measurement is spent on preparatory work such as finding points, clearing obstacles in the line of sight, connecting lighting equipment, and erecting measurement equipment. The control survey in the tunnel has seriously affected the cost and progress of survey and construction; due to the vigorous development of computers and survey office software, the efficiency of different surveyors in processing office results data is almost the same; based on the above analysis, if you want to The cost of control and measurement in the cave has been controlled and the measurement efficiency has been improved. We can only find a breakthrough in the control network and field measurement data collection at selected points.

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