Method for preventing longitudinal ship mooring rope from fracturing when dock gate of ship lift opens

A technology for ship lifts and lying doors, applied in vertical lifting of ship machinery, ship lifting devices, force/torque/power measuring instruments, etc., can solve problems such as complex measurement and calculation

Active Publication Date: 2013-09-04
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the superimposition of the propulsion wave system and the reflection wave system of the solid wall formed in the ship lift cabin door during the opening process, the measurement and calculation of wave height, wave direction, and wave period are more complicated, so this formula is not suitable for bearing Calculation of Mooring Force of Ships in Restricted Water Areas in Ship Compartments

Method used

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  • Method for preventing longitudinal ship mooring rope from fracturing when dock gate of ship lift opens
  • Method for preventing longitudinal ship mooring rope from fracturing when dock gate of ship lift opens
  • Method for preventing longitudinal ship mooring rope from fracturing when dock gate of ship lift opens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] In a certain area, the effective water area size of a certain ship lift compartment is 59.0m×12m×2.5m (length×width×water depth), the design water depth of the ship-bearing compartment is 2.5m, and the allowable overload and underload ±0.2m. Constructed according to the 500-ton ship type standard, the ship size (total length×width×draft) is 55m×10.8m×1.6m, the midship section coefficient is 0.907, and the displacement is 637.27m 3 .

[0072] According to the above engineering data, use the following formula (3) to calculate the maximum longitudinal mooring force on the berthed ship in the cabin when the water depth of the cabin is 2.5m and 2.3m respectively, when the recumbent door is opened under flat water conditions. And a physical model was made to measure the maximum longitudinal mooring force of the ship when the recumbent door was opened and closed. The calculation results and the measured values ​​of the physical model are shown in Table 1.

[0073] When △h≥0: ...

Embodiment 2

[0079] According to the data of embodiment one, when using formula (3) and (4) to calculate the water depth of the ship compartment to be 2.5m, the water level difference inside and outside the ship compartment is respectively 0.1, 0.2, -0.1, -0.2m when the recumbent door is opened. Subject to maximum longitudinal mooring force. The calculation results of formulas ⑶ and ⑷ and the measured values ​​of the physical model are shown in Table 2.

[0080] When △h≥0:

[0081] P z = 0.334 WΔhb A k - A m gh t v + 0.152 Wbh 2 ( A k - ...

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Abstract

The invention relates to a method for preventing a longitudinal ship mooring rope from fracturing when a dock gate of a ship lift opens. The method comprises the following steps of: measuring hydraulics parameters of a ship tank and the ship when the dock gate of the ship lift opens and calculating the maximum longitudinal mooring force of the ship when the dock gate of the ship lift opens according to a formula; selecting a corresponding rope according to the calculated maximum longitudinal mooring force of the ship when the dock gate of the ship lift opens, berthing the ship in a ship reception chamber of the ship lift, and firmly tying the ship by a mooring rope; and opening and closing the dock gate of the ship lift for multiple times according to a certain rate tv, and detecting whether the mooring rope factures or not. The method has the beneficial effects that the maximum longitudinal mooring force of the ship when the dock gate is opened and closed can be calculated by selecting different formulas according to different water levels on the two sides of the dock gate of the ship tank of the ship lift, so that not only are the measurement and the calculation simple and convenient, but also the accuracy of a measuring result is improved, and further the fracturing of the mooring rope can be avoided.

Description

technical field [0001] The invention specifically relates to a method for preventing the longitudinal mooring rope of a ship from breaking when the lying door of a ship lift is opened. Background technique [0002] The ship lift is a main type of navigable structure. When the door of the ship lift is opened and closed, the water in the cabin is squeezed by the door and the water level difference inside and outside the cabin causes water fluctuations in the cabin, which makes the ship The longitudinal mooring force of the ship moored in the cabin suddenly increases. If the mooring force exceeds the designed cable mooring force, the mooring rope will break, which will not only affect the berthing safety of the ship, but also affect the overall operation safety of the ship lift. Therefore, it is particularly important to control the opening and closing speed of the ship's lying door and reasonably predict the value of the maximum longitudinal mooring force on the ship during th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02C5/00G01L5/00
Inventor 李中华胡亚安郭超
Owner NANJING HYDRAULIC RES INST
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