A method of unloading a dock gate

By using a semi-submersible vessel to submerge and a winch to tow the dock gates, the dock gates are unloaded from the semi-submersible vessel in stages, solving the problems of high cost and high port facility requirements in existing technologies, and realizing low-cost and efficient dock gate unloading operations.

CN121269036BActive Publication Date: 2026-07-24SEPCO ELECTRIC POWER CONSTR CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SEPCO ELECTRIC POWER CONSTR CORP
Filing Date
2025-10-30
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing technologies, unloading costs are high and operations are complicated when semi-submersible vessels transport multiple dock gates. They also have high requirements for the water depth and configuration of ports and wharves, making it difficult to unload efficiently in the open ocean.

Method used

The semi-submersible vessel submerges until its deck is completely submerged, causing the dock gate to begin to draft. Then, using tugboats and winches, the dock gate is towed away from the semi-submersible vessel in stages, gradually increasing its buoyancy through a stepped floating unloading method, allowing it to float and be towed to the dock.

Benefits of technology

This method achieves low-cost and simple operation of dock gate unloading, suitable for deep-sea operations, without requiring sophisticated port and terminal facilities, thus improving transportation efficiency and economy.

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Abstract

The present application relates to a kind of dock gate unloading method, belong to dock gate transport technical field, also method includes checking flap gate and pontoon gate, ensure that the deck layer access hatch of all dock gates is temporarily closed, and ensure that the fastening device of all dock gates is loosened;Drive semi-submersible ship to dive, until the deck of semi-submersible ship is completely immersed in water, so that all dock gates start to take water;Drive semi-submersible ship to continue to dive, until the flap gate floats in water, keep the current diving floating state of semi-submersible ship;Using the winch of tugboat and semi-submersible ship, the flap gate is towed away from the top of semi-submersible ship;Drive semi-submersible ship to dive again, until two pontoon gates float in water, keep the current diving floating state of semi-submersible ship;Using the winch of tugboat and semi-submersible ship, one pontoon gate close to the edge of ship side is towed away from the top of semi-submersible ship;Repeat the second time to tow, to tow the remaining one pontoon gate from the top of semi-submersible ship.
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Citation Information

Patent Citations

  • JP1987131998U

  • US20180327058A1