A Research In Surveying Of Immersed Tube

The immersed tube for tunnel construction is a method that we have the prefabricated tubes sink to the excavated directions prior, then in control of the water body will be assembled. That sinking is a very important step in the entire constructions process. In order to sink the tubes to the position designed, we have to real-time monitored the location of the body characteristics points (characteristics points of datum etc)Through formatting mathematical models, combining the construction measurements, this paper presents a method that we make use of total stations to go along real-time monitoring by computer, in order to resolve the problem in immersed tube. It is that obtaining data from total station, through the coordinates between different coordinate system conversion, the real time calculation of body characteristics points of tube, thereby we can control the process of real-time monitoring.This paper presents a series of items for detecting the shape of submersed tube, and constructs a plan to survey it; This paper also presents a method to solve the tunnel axis displacement on line caused by angle error between tube center axis and datum of joint.The software programmed with Visual Basic correspond to this paper has achieved that the data processing in the immersed tube effectively and the graphic simulation of the process of immersed tube. It is helpful to improve immersed tube. And I have a good application in my test.In order to validate my test ,I had to make the tube move horizontally,perpendicularly.In the finality, the problems requiring further studies are discussed.