Transverse Dredging Method
1. In standard operating areas, cutter suction dredgers equipped with spuds should employ either the symmetrical spud transverse dredging method or the spud-carriage transverse dredging method.
2. In areas with significant wind and waves, dredgers equipped with three-cable positioning systems should employ the three-cable positioning transverse dredging method.
3. In areas with strong currents or significant wind and waves, cutter suction dredgers equipped with anchor-cable transverse dredging systems should employ the anchor-cable transverse dredging method.
Sectional Dredging Method
1. When the length of the trench to be dredged exceeds the effective reach of the dredger's floating pipeline, the work should be divided into sections based on the operational range of the dredger and its floating pipeline.
2. Curved sections of the trench should be excavated by dividing them into multiple straight segments; the curve may be approximated as a series of straight lines for this purpose.
3. Dredging should be carried out in sections in accordance with contract requirements regarding varying trench specifications or differing project schedules.
4. Sectional dredging may be adopted as necessary to accommodate navigation or other interfering factors.
Dredging with or against the Current
When using steel piles for positioning during inland waterway operations, dredging with the current is preferable; when using the anchor-cable transverse dredging method, dredging against the current is preferable. In cases of high flow velocity, dredging with the current may be adopted, provided a stern anchor is deployed to ensure safety.