How is the positioning accuracy of a Pile Driving Vessel achieved through automated control using GPS and scanner technology?

Key Applications of GPS Positioning Technology

Using GPS (Global Positioning System) technology, the Pile Driving Vessel has achieved a significant leap from traditional manual positioning to automated and precise positioning.

1. Introduction of Base Stations and Differential Technology

By installing two GPS signal receivers and scanners on the vessel, an absolute coordinate system and a vessel-based coordinate system are established, and precise positioning is achieved using differential signals. This technology aims to overcome the problems of low efficiency and poor accuracy of traditional manual control methods and improve positioning accuracy.

2. Real-time Coordinate Monitoring

The GPS positioning system can automatically display the vessel's coordinates in real time and combine them with anchor point coordinates for preliminary positioning of the vessel. The positioning deviation is recommended to be controlled within 0.5 meters. In construction surveying and positioning technology, the coverage range of the GPS measurement base station can effectively cover the entire wind farm area, meeting the requirements of construction surveying and vessel positioning.

3. High-Precision Positioning

By introducing the Trimble satellite GPS system, the pile driving vessel can reliably position itself within ±25 millimeters. The system uses GPS measurement base stations and auxiliary equipment such as total stations and theodolites for coordinate, verticality, and elevation measurements to ensure high-precision operation requirements.

Auxiliary Correction with Scanner Technology

Scanner technology plays a crucial auxiliary role in the positioning system of the pile driving vessel.

1. Obtaining Pile Foundation Position

The scanner is used to obtain the actual position of the pile foundation and monitor the pile's offset error in real time. This technology allows for observation and fine-tuning of the pile position after the pile self-settling and pile driving are completed, ensuring the accuracy of the pile position.

2. Deviation Calculation and Correction

Anchor point coordinates are calculated using an angle measuring instrument and anchor cable length. The actual data obtained from the scanner is used to calculate the offset error, achieving high-precision automated control. This process allows for appropriate adjustment of the pile driving vessel's anchor cables, re-hammering, or hammer lifting adjustments based on the pile position deviation.

3. Integration with Dynamic Systems

The scanner works in conjunction with the GPS system. In the pile top elevation monitoring system, it cooperates with the measurement of settlement and the "hammering counter" to monitor the pile penetration depth in real time, ensuring construction quality.

Implementation of the Automated Control System

By integrating GPS and scanner technologies, the Pile Driving Vessel achieves a high degree of automated control.

1. Data Fusion and Real-time Monitoring

The system fuses real-time GPS coordinates with pile position data acquired by the scanner, using parameters such as angle measurement and anchor cable length for real-time coordinate transformation and motion control algorithm calculations. This system can continuously monitor minute changes in the vessel's attitude, ensuring positioning accuracy.

2. Anchor Point Positioning and Adjustment

After the vessel is towed to the vicinity of the designated location for initial positioning, the GPS positioning system is used to deploy eight anchors to their predetermined positions via anchor boats, ensuring the vessel's stable positioning. If excessive pile position deviation is detected, the system will instruct the hammer to be lifted and the anchor cables adjusted appropriately based on the deviation.

3. Dynamic Positioning and Safety

The dynamic positioning system ensures stable operation even in strong winds and rough seas. By real-time monitoring of pile deviation and verticality, hammering can only begin when all control data meets design requirements, ensuring safety and accuracy.