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CN-122009434-A - Rapid control method for folding deflection of total sections in dock

CN122009434ACN 122009434 ACN122009434 ACN 122009434ACN-122009434-A

Abstract

The invention relates to the technical field of ship refitting, and discloses a rapid control method for folding deflection of a total section in a dock, which comprises the steps of firstly determining parameters of the total section to be folded, secondly adjusting ballast water, thirdly hanging the total section to be folded in, fourthly carrying out sinking control on the hung total section, fifth adopting a cloud track trolley to carry out fine positioning on the total section, sixth adopting a laser theodolite to assist in adjusting a horizontal datum line of the total section, seventh adopting the steps of repeating the steps from the second to the sixth in sequence, hanging the total section in a cargo warehouse in sequence, and finally hanging the original bow total section until all the total sections to be folded are positioned, and shortening the folding period through cooperative division of the laser theodolite and the cloud track trolley, combining the hanging sequence of the total sections from the back to the front, and dynamically monitoring the positioned total section baseline condition through a tail after each hanging one total section in real time, so as to avoid deviation accumulation and post reworking, and greatly reduce quality risks.

Inventors

  • CHEN LIBING

Assignees

  • 中船澄西船舶修造有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. A rapid control method for the folding deflection of a total section in a dock is characterized by comprising the following steps: step one, determining parameters of the total sections to be folded, including the number, weight and length of the total sections; step two, before the total section is hoisted, ballast water is adjusted at the corresponding position of the floating dock according to the weight of the total section to be hoisted, the whole state of the floating dock is controlled to be close to the original state, and the dock state change control is realized; step three, hanging the to-be-folded general section into a floating dock by adopting a large floating crane, monitoring the dock state change of the floating dock in real time in the hanging process, and repeating the step two to adjust the ballast water if the dock state is deviated from the original state; Lifting the front end of the suspended block by 15-20 mm, knocking tight wedge-shaped wood to fix the front end of the block, installing a rigid support below a strong frame at the front end of the block, wherein the height of the rigid support is 5mm greater than the theoretical height, and installing a rigid support at the rear end of the block to align the height of the rigid support at the rear end with that of the adjacent block; adopting a cloud rail trolley to precisely position the block, aligning and adjusting the left and right positions of the block through a center reference, aligning and adjusting the front and rear positions of the block through front and rear references, and completing left and right and front and rear direction positioning of the block; Step six, after each section is hung in, erecting a laser theodolite at the tail of the floating dock, and adjusting the horizontal datum line of the section with the aid of the laser theodolite, and monitoring the baseline condition of the last positioned section by using the laser theodolite; Step seven, repeating the step two to the step six in the sequence from back to front, sequentially hanging into a warehouse main section, and finally hanging into an original bow main section until all the main sections to be folded are positioned; step eight, monitoring the baseline deflection of the ship body by using deflection detection equipment after all the total sections are positioned; And step nine, judging whether the baseline deflection of the ship body meets the industry standard of +/-25 mm, if so, closing, and if not, finely adjusting the rigid support height of the total section according to the monitoring result.
  2. 2. The method for rapidly controlling the folding flexibility of the total section in the dock according to claim 1, wherein in the second step, ballast water is adjusted at a position corresponding to a floating dock according to the weight of the total section to be lifted, specifically, weight data of the total section to be lifted is obtained in advance, a ballast water tank corresponding to the lifting position of the total section on the floating dock is matched, and the water quantity of the ballast water tank is adjusted by injecting or discharging the ballast water, so that the deviation between the draft of the position corresponding to the floating dock and the original state is smaller than 5mm.
  3. 3. The method for quickly controlling the folding deflection of the total section in the dock according to claim 1, wherein in the fourth step, before the rigid support is installed below the strong frame at the front end of the total section, the method further comprises the step of marking a stress center point of the strong frame at the front end of the total section through a total station, ensuring that the top end of the rigid support is completely attached to the stress center point, and avoiding the stress deflection of the support.
  4. 4. The method for rapidly controlling the folding deflection of the total section in the dock according to claim 1, wherein in the fifth step, the center reference alignment is realized by overlapping a preset center line mark of the floating dock with a center line mark of the outer wall of the total section, and the front-back reference alignment is realized by overlapping a preset rib bit line mark of the floating dock with a rib bit line mark of the end part of the total section.
  5. 5. The method for rapidly controlling the folding deflection of the total section in the dock according to claim 1, wherein in the sixth step, the laser theodolite is erected at the tail of the floating dock, specifically, the laser theodolite is erected on the center line of the tail of the floating dock, the height of the theodolite is adjusted to enable the laser emission end and the horizontal reference monitoring point of the total section to be adjusted to be located at the same height, the levelness of the theodolite is calibrated through a horizontal bubble, and the laser direction is ensured to be parallel to the horizontal reference line.
  6. 6. The method for rapidly controlling the folding deflection of the total section in the dock according to claim 1, wherein in the step six, the baseline condition of the last positioned total section is specifically that the laser theodolite emits laser to a baseline monitoring point of the positioned total section, the deviation value of the laser irradiation position and the preset baseline position is recorded, and if the deviation value is larger than 5mm, a height adjusting bolt of a rigid support of the positioned total section is screwed until the deviation value is smaller than or equal to 5mm.
  7. 7. The method for rapidly controlling the folding deflection of the total section in the dock according to claim 1, wherein in the step eight, deflection detection equipment is a total station, deflection monitoring points are arranged on a deck of a ship body every 10 meters during detection, and the difference value between the actual elevation and the theoretical elevation of each monitoring point is measured through the total station, namely the deflection value of each point.
  8. 8. The method for quickly controlling the folding deflection of the total section in the dock according to claim 1, wherein in the step nine, the baseline deflection of the ship body is finally controlled within +/-10 mm, and when the deflection values of all monitoring points meet the range, the ship body is judged to meet the folding quality requirement.
  9. 9. The method for rapidly controlling total section folding flexibility in a dock according to claim 1, wherein in the fifth step, the actual use time of the cloud rail trolley is counted, and the folding dock period time is judged by comparing the actual use time with the original planned use time.
  10. 10. The rapid control method for the closure deflection of the total section in the dock according to claim 1 is characterized in that in the third step, the large floating crane is 1600 tons, the lifting speed of the total section in lifting is controlled to be 0.5-1m/min, the descending speed of the total section in the floating dock is consistent with the lifting speed, 4-6 traction cables are symmetrically arranged on the left side and the right side of the total section in the lifting process, the tension of each cable is controlled to be 5-8kN, and the special person is used for adjusting the cable tension in real time so as to avoid transverse shaking of the total section in the lifting process or collision with the inner wall of the floating dock and the positioned total section.

Description

Rapid control method for folding deflection of total sections in dock Technical Field The invention relates to the technical field of ship refitting, in particular to a rapid control method for total section folding deflection in a dock. Background In the ship refitting project, when the crude oil wheel is refitted into a bulk cargo ship, a scheme of reserving a stern section and a bow section of the original ship, adding a cargo warehouse section in the middle part and docking with the original ship section in a dock is often adopted. In the whole folding process, the folding deflection control of the dock total section is a key link, and the control effect directly influences the refitting quality of the ship and the project progress. However, in the actual closing process of the total sections in the dock, there are many factors influencing deflection control, so that the conventional method is difficult to control the deflection efficiently and accurately, and the method specifically comprises the following steps: The dock state control is difficult, namely the floating dock is in floating operation, is easy to shake due to wind and waves and disturbance of surrounding sailing ships, and after each time the floating dock is hung into a general section, the dock state is further deviated due to stress change of the dock body, so that a stable folding reference is difficult to maintain; The sinking of the block is uncontrollable, namely the weight of the block is large, the dock blocks supporting the block are made of wood materials, unpredictable sinking amount can be generated under the action of gravity, the sinking amount cannot be accurately controlled in advance in the prior art, and the position deviation of the block is easy to cause; The precision of the horizontal reference is low, namely the accurate positioning of the total section needs to meet the central reference, the front and back references and the horizontal reference, the central reference and the front and back references in the prior art are easy to control, but the horizontal reference is difficult to realize accurate control by fixing a horizontal standard rod due to dynamic change of the dock state, and the refitting quality is influenced; The positioning efficiency and deflection control are poor, in the existing positioning process, equipment such as a cloud rail trolley is long in occupied time, the requirement of a compact dock period is difficult to meet, the baseline deflection of a ship body is difficult to stably control within an industry standard of +/-25 mm, and the problem of out-of-tolerance is easy to occur. In summary, the existing method for folding the total sections in the dock cannot solve the problems of fluctuation of the dock state, sinking of the total sections, reference deviation and low efficiency at the same time, and a rapid control method for folding the total sections in the dock is needed. Disclosure of Invention The invention aims to provide a rapid control method for total section folding deflection in a dock, which aims to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the method for rapidly controlling the folding deflection of the total section in the dock comprises the following steps: step one, determining parameters of the total sections to be folded, including the number, weight and length of the total sections; step two, before the total section is hoisted, ballast water is adjusted at the corresponding position of the floating dock according to the weight of the total section to be hoisted, the whole state of the floating dock is controlled to be close to the original state, and the dock state change control is realized; step three, hanging the to-be-folded general section into a floating dock by adopting a large floating crane, monitoring the dock state change of the floating dock in real time in the hanging process, and repeating the step two to adjust the ballast water if the dock state is deviated from the original state; Lifting the front end of the suspended block by 15-20 mm, knocking tight wedge-shaped wood to fix the front end of the block, installing a rigid support below a strong frame at the front end of the block, wherein the height of the rigid support is 5mm greater than the theoretical height, and installing a rigid support at the rear end of the block to align the height of the rigid support at the rear end with that of the adjacent block; adopting a cloud rail trolley to precisely position the block, aligning and adjusting the left and right positions of the block through a center reference, aligning and adjusting the front and rear positions of the block through front and rear references, and completing left and right and front and rear direction positioning of the block; Step six, after each section is hung in, erecting a laser theodolite at the tail of the floating dock, and