Research On A New Method Of Control Survey And Construction Survey Of Lingdingynag Bridge In Shenzhen-zhongshan Bridge

With the continuous improvement of our country’s infrastructure construction and the needs of development along the bay area,the construction of cross-sea passages has become an important part of the construction of the Greater Bay Area.Lingdingyang Bridge is an important part of the Shenzhen-Zhongshan Bridge,an important sea-crossing channel in the Guangdong-Hong Kong-Macao Greater Bay Area.Due to its location and complex environmental factors,the sea-crossing elevation control measurement and construction measurement of the bridge Brings many unfavorable factors.The particularity of its location and complicated environmental factors have brought many unfavorable factors to the sea-crossing elevation control survey and construction survey of the bridge.The underwater survey platform near the Lingdingyang Bridge is far away from both sides of the strait,and has been swaying under the influence of strong winds and side waves.Traditional sea-crossing elevation control surveys are difficult to carry out.The construction survey of Lingdingyang Bridge has the characteristics of high accuracy requirements,complex survey environment,and heavy workload.The traditional construction survey is extre mely inefficient in this survey area and has certain limitations.Therefore,this article combines the GNSS technology to study a new method suitable for the cross-sea elevation control survey and construction survey of Lingdingyang Bridge.In order to achieve the research purpose of this article,the main research content of this article includes the following parts:First,through the cross-sea triangular elevation measurement method of high-frequency counter-observation of two intelligent total stations,the elevation of the control points on the surveying platform of the Lingdingyang Bridge in the sea was measured.Second,by studying the abnormal elevation change rates of the Shenzhen-Zhongshan Bridge and each elevation measurement section of the Lingdingyang Bridge,analyzed the elevation anomaly change laws of the underwater survey platforms in the Lingdingyang Bridge measurement area.A new method of cross-sea elevation measurement based on the abnormal change rate of the average elevation of the bridge axis was proposed,and the actual measurement verification was carried out on the site of the measurement area.Third,the process of setting out sea structures was divided into two steps: rough setting out and precise setting out.Experiments demonstrated the feasibility of using GNSS real-time dynamic positioning for rough setting out.And the feasibility of precise setting out through the combination of experimental GNSS dynamic measurement post-processing positioning and GNSS fast static measurement.Fourth,according to the actual needs of construction measurement,a GNSS construction measurement system for Lingdingyang Bridge based on GNSS dynamic measurement and fast static measurement was designed.The applicability and feasibility of the system were tested on the construction site.