Elevation monitoring method for immersed tube immersion installation process

Abstract

The invention discloses an elevation monitoring method for an immersed tube sinking and mounting process. The method comprises the following steps of setting a tide level station near a construction area, setting a station water level gauge and a data transmitting unit at the tide level station, laying two static level gauges in a tube joint after prefabrication of the tube joint, laying a control point water level gauge at the top of the tube, and sinking the tube joint by adopting a sinking barge; and a densimeter being arranged on the sinking barge. The method is advantaged in that accurate transmission of the absolute elevation of the tide level station can be achieved through the average horizontal plane; after density correction is carried out on the measured value of the water level gauges, precision can reach 5 mm, the attitude angles Pitch and Roll of the immersed tube obtained through measurement and calculation of the two control point water level gauges and the two static force level gauges can reflect the overall attitude condition of the immersed tube, and data are more accurate than that of a clinometer; a control point water level gauge mounted at the bottom of the measurement control tower is closer to the bottom of the immersed tube, and tube bottom absolute elevation data with higher precision can be obtained after Pitch and Roll correction.

Description

technical field [0001] The invention relates to an underwater elevation monitoring method of an immersed tube, in particular to an elevation monitoring method during the installation process of an immersed tube. Background technique [0002] With the continuous development of transportation technology, more and more cross-river passages in central urban areas are constructed by immersed tube method. With the completion and opening of the Hong Kong-Zhuhai-Macao Bridge, people have gradually realized the great advantages of immersed tube tunnels, large cross-section, shallow buried depth, and the construction of immersed tube cross-river channels in prime urban areas can minimize the impact on the current environment. disturbance. Immersed tube tunnels usually have relatively large longitudinal slopes. During the construction process of foundation trench excavation, foundation laying, and pipe joint sinking and installation, it is necessary to strictly follow the design eleva...

AI Technical Summary

Problems solved by technology

The installation and construction of immersed tubes usually use RTK GPS to measure the plane position and elevation, and use the inclinometer to correct the attitude. Due to the GPS accuracy and the large height difference between the GPS and the inclinometer, the elevation error of the immersed tube exceeds 40mm. Affect the control and adjustment of the pipe joint sinking installation process, and have adverse effects on subsequent construction

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