Method for surveying river-crossing leveling during shield breakthrough construction

Abstract

The invention relates to surveying and mapping class, in particular to a method for surveying river-crossing leveling during the shield run-through of rivers in tunnel engineering, which comprises the steps of: starting from various elevation control points of two banks of a river respectively, adopting a second-order leveling surveying specification, and inductively surveying elevations to the banks of the river respectively first; then taking second-order leveling points inductively surveyed on the two banks of the river as transfer station surveying points; and finally taking triangular elevation surveying as the basis, utilizing a higher electronic holographic device, staring from one transfer station surveying point on one side of the river to place a sighting target as 'backsight', placing a sighting target as 'foresight' at one transfer station surveying point on the other side of the river, and transferring the elevation of the 'backsight' sighting target to the 'foresight' sighting target by surveying through the station surveying points and taking the station surveying points as the transition. The method is simple, convenient and efficient, has simple used equipment andhigh surveying accuracy, is particularly suitable for the construction of the tunnel shield run-through of the rivers, and can effectively meet the requirement of control precision of run-through surveying of shield advance construction.

Description

technical field [0001] The invention relates to surveying and mapping, in particular to a method for measuring the river crossing level when a shield tunnel passes through a river in tunnel engineering. Background technique [0002] With the rapid development of electronic technology, the continuous emergence of total station instruments with higher precision and higher degree of electronicization, GPS satellite measurement and positioning technology is becoming more and more mature. These provide the possibility for the improvement of measurement technology, precision and work efficiency, and provide hardware guarantee for the improvement of traditional measurement methods. [0003] In the construction of tunnel shield tunneling through rivers, due to the influence of river tides and measurement errors in the elevation system along both sides of the river, the leveling control points on both sides of the river are prone to systematic errors, which will affect the shield tun...

AI Technical Summary

Problems solved by technology

[0004] However, the poor accuracy of ordinary triangular elevation measurement, the absolute accuracy requirements of GPS elevation measurement and the constraints of many conditions in leveling measurement, such as the short measurement distance of second-class leveling measurement and poor measurement accuracy across rivers, are difficult to meet the needs of construction.

Images