Semi-submersible type lifting platform ballast water system and operation method thereof

Abstract

The invention provides a semi-submersible type lifting platform ballast water system and an operation method thereof. The system comprises lower floating bodies, uprights symmetric left and right and an upper platform, wherein the upper platform is provided with a central control system. The system is characterized in that each lower floating body is internally provided with multiple ballast tanks, one lower floating body is provided with a water pump ballast system, and each ballast tank is provided with a water inflow and outflow valve and an opening communicating with a compressed air ballast system; ballast tanks are arranged in the uprights and provided with drainage valves; the water pump ballast system is provided with a sea valve connected with water inlets of the ballast tanks of the uprights through pipelines; and the compressed air ballast system, a ballast tank liquid level measurement unit, an emergency drainage control unit and a draught measurement unit are arranged in the upper platform. The operation method includes the steps that gravity water inflow and compressed air drainage of the ballast tanks in the lower floating bodies are carried out and drainage operation of the ballast tanks in the uprights and the water pump ballast system is carried out. By the adoption of the system and the operation method, a ballast water pipe system is simplified, the ballast adjusting speed is high, and the requirements for the stability of the platform and the operation safety of a crane are met.

Description

technical field [0001] The invention relates to a ballast water system of a semi-submersible lifting platform and an operation method thereof. Background technique [0002] The semi-submersible lifting platform has become the best carrier for super-large cranes due to its strong wind and wave resistance, large deck area, large deck variable load, large loading capacity, wide range of water depths, and many personnel living quarters. Semi-submersible lifting platforms generally have various working conditions such as maneuvering, lifting operations, and storm self-storage, and their special operational functional requirements put forward higher requirements for the design of the ballast system. [0003] The ship-type semi-submersible lifting platform usually consists of two lower floating bodies, three to five pairs of left and right symmetrical columns, and an upper platform. During dispatching and sailing, in order to reduce resistance, the waterline is located at the lowe...

AI Technical Summary

Problems solved by technology

In addition, when the crane is slewing with load, the direction of the overturning moment generated by the huge lifting weight changes in a short period of time, and the change in the overturning moment must also be balanced by rapid load adjustment of ballast water, otherwise the tilt of the platform will be aggravated , and make the slewing mechanism run downhill, which is very dangerous

Therefore, in order to ensure the safety of the lifting operation, a large number of ballast tanks and anti-tilt load adjustment systems need to be installed in the main column of the platform for the rapid adjustment of ballast water, which is not available in conventional semi-submersible lifting platforms. The latter generally adopts a pump ballast system with a single function due to its small loading capacity and low requirements on loading speed, which cannot meet the needs of fast and efficient loading adjustment functions for semi-submersible lifting platforms with huge load adjustment requirements.

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