Horizontal displacement monitoring method based on backward intersection and free station setting

Abstract

The invention discloses a horizontal displacement monitoring method based on backward intersection and free station setting. A working base point pier is not set in the horizontal displacement monitoring of a deep foundation pit. By the translation and rotation of a coordinate system, a coordinate observed per time is transformed to the same coordinate system for comparison, and thus the deformation is obtained. The invention provides a new deformation monitoring method based on the combination of forward intersection and free station setting, and the calculation and deduction of the process are completed. A working base does not need to manufacture a pile pier, and a working base point can be preferentially selected on a complex monitoring site every time, so that the working base point is prevented from being destroyed in the monitoring process. Moreover, by the selection, the intervisibility of the working base point and a deformation monitoring point is ensured favorably during monitoring, and the problem that conventional monitoring is difficult in intervisibility is solved. On the basis of satisfying the engineering precision requirement, the horizontal displacement monitoring method provides the solution algorithm of naturalization of each periodic coordinate system and greatly improves the production efficiency.

Description

technical field [0001] The invention belongs to the field of engineering construction technology surveying and mapping, and relates to a horizontal displacement monitoring method based on resection free station setting. Background technique [0002] With the progress of urban construction, there are more and more high-rise buildings, and the construction of foundation pit engineering is developing towards the characteristics of deep excavation, narrow working surface, and close proximity to surrounding houses and underground pipelines. In order to ensure the safety of deep foundation pit excavation, and To provide basic information for the support scheme of the foundation pit, the deformation monitoring of the foundation pit must be carried out. During the excavation construction of foundation pit, deformation monitoring is a means to realize the information construction of deep foundation pit engineering. The monitored data information can be used to guide the construction ...

AI Technical Summary

Problems solved by technology

[0004] Intersection method: There is a dangerous circle when measuring the coordinates of the working base point, and the angle of intersection generally must satisfy 30°≤α≤150°, and because the construction site environment is relatively complicated, it is difficult to ensure the communication between the working base point and 2-3 base point piers. See

[0005] Total station free station setting method: The free station setting program that comes with the total station has low accuracy in solving the coordinates of the working base point, which cannot meet the needs of deformation monitoring. When using redundant observations to improve the accuracy, it is necessary to solve the coordinates of the working base point on site , the calculation process is cumbersome and complicated, and the timeliness of foundation pit monitoring cannot be guaranteed if the coordinates of the working base point cannot be obtained immediately. Therefore, this method is often not advisable in the design of deep foundation pit monitoring schemes

[0006] Corner net method: before measuring the coordinate change of the deformation point of the foundation pit, the coordinates of the working base point need to be calculated according to the composite traverse or closed traverse measurement. This process increases the workload of the field survey virtually, and also It takes a lot of time and cannot guarantee the timeliness of foundation pit monitoring

[0007] In a city with dense high-rise buildings, the environment of the construction site is complex, the reference point and the working base point are easily destroyed, and a good communication between the reference point and the working base point cannot be guaranteed, so it is difficult to use the corner mesh method and front intersection 1. Baseline method for monitoring. Secondly, because the free station method needs to solve the coordinates of the working base point on site, the calculation process is cumbersome and complicated, and it is impossible to solve the coordinates of the measurement site immediately in the field, and the timeliness of foundation pit monitoring cannot be guaranteed.

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