CN-122021127-A - Offshore platform deck plate lifting point generation method

CN122021127ACN 122021127 ACN122021127 ACN 122021127ACN-122021127-A

Abstract

The invention discloses a method for generating lifting points of deck plates of an offshore platform, which belongs to the technical field of ships and ocean engineering and is used for generating the lifting points of the deck plates of the offshore platform, and comprises the steps of calculating the gravity center of the deck plates, selecting a single crane or double cranes according to the weight of the deck plates, selecting the lifting points of the single cranes, and constructing a lifting point circle by taking the gravity center as a circle center and taking a calibrated distance set as a radius; and selecting a double-crane lifting point, dividing the deck plate into two areas, setting the circle centers of the lifting point circles in each area, constructing the lifting point circles by taking the calibrated distance set as the radius, forming intersection points by the lifting point circles and the rod piece, selecting four lifting points as candidates each time for traversing by each lifting point circle, and finally generating the lifting point of the deck plate through rationality judgment of the lifting points. The method can quickly respond to project demands by constructing the hanging point circle and traversing the candidate points, and can still be effectively applied when facing various complex and nonstandard deck plate structures through an auxiliary positioning mechanism, so that the robustness of the method is improved.

Inventors

Zhang Qianran
WANG XIUKUN
YANG FANGYAN
CHEN BOJIE
Guo Yingxiu
KAN ZHUO
ZHAI XIAORUI

Assignees

山东科技大学

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (10)

1. The method for generating the lifting point of the deck strip of the offshore platform is characterized by comprising the following steps of: Reading a deck plate parameter file by using a computer, calculating the weight and the gravity center position of the deck plate, constructing a deck plate model by using mechanical software, adjusting the gravity center of the deck plate model based on an equivalent moment method, reading crane information in a database, setting a deck plate weight threshold, selecting a single crane if the weight of the deck plate is smaller than the weight threshold, and selecting a double crane if the weight of the deck plate is larger than or equal to the weight threshold; Constructing a distance set according to the distance between the center of gravity of the deck plate and the connecting point of each rod piece, setting an axis threshold value, deleting an invalid distance, and obtaining a calibrated distance set; for the selection of the single crane hanging point, the center of gravity is taken as the center of a circle, and the calibrated distance set is taken as the radius to construct a hanging point circle; and carrying out lifting point rationality judgment based on the intersection point formed by the lifting point circle and the rod piece, and finally generating the lifting point of the armor plate.
2. The method for generating a lifting point for a deck slab of an offshore platform according to claim 1, wherein the deck slab weight is calculated : ; In the formula, Is the cross-sectional area of the rod member, For the length of the rod member, For the density of the rod members, For indexing the rod members, the index is provided, , For the total number of bars to be the total number of bars, Is the first The cross-sectional area of the root shaft, Is that The length of the root rod piece is equal to the length of the root rod piece, Is that The density of the root bars; calculating the center of gravity of a rod : ; In the formula, Is the starting point coordinates of the rod piece, Is the end point coordinates of the rod piece, Is the first The starting point coordinates of the root pin, Is the first End point coordinates of the root rod; Calculating the center of gravity of deck plate : ; Constructing deck plate model by using mechanical software Dividing the armor plate model into 4 quadrants for the origin, searching four points with maximum moment according to a greedy algorithm, and firstly confirming the distance in a second quadrant The furthest rod intersection point is taken as the node of the second quadrant The coordinates are To Horizontal line is made for the center And perpendicular line , Forming an intersection with the lever member in the first quadrant, selecting and The furthest intersection point is taken as a first quadrant node The coordinates are , Forming an intersection with the lever in the third quadrant, selecting and The furthest intersection point is taken as the third quadrant node Coordinates of Then by Perpendicular to the center To Horizontal line is made for the center , And If the node of the fourth quadrant does not fall on the node of the rod, reselecting the node of the second quadrant to traverse until 4 nodes meeting greedy algorithm are obtained, deleting the node of the rod selected in the second quadrant every traversal, and selecting a node from the rest nodes of the rod The furthest rod member intersection point is used as a second quadrant node, and the moment balance principle is based on the upper edges of 4 nodes The axial direction applies forces with equal magnitude and opposite direction so as to generate a pure moment effect, and the gravity center of the deck plate model is adjusted to the actual gravity center position of the deck plate based on the moment effect; setting a weight threshold for the armor plate If (if) Selecting a single crane if And selecting a double crane.
3. The method for generating a lifting point of a deck strip of an offshore platform according to claim 2, wherein The distance to each rod piece connecting point is set as Delete Distance less than axis threshold value, obtain corrected distance set , Is provided with Is that Is used for the indexing of (a), 。
4. A method for generating a lifting point of a deck strip of an offshore platform according to claim 3, wherein for a single crane, the method comprises the following steps of As the center of a circle For radius, construct The hanging points are round and the hanging points are round, Is that Middle (f) A distance.
5. A method of generating a lifting point for a deck plate of an offshore platform according to claim 3, wherein for a double crane, a dividing line is made perpendicular to the long side of the deck plate, the dividing line passing through the center of gravity, dividing the deck plate into two sub-areas And Is provided with And The center of the hanging point circle is And To Build up for radius in each sub-region And a plurality of hanging point circles.
6. The method for generating a lifting point for a deck strip of an offshore platform according to claim 5, wherein the calculating is performed by And Is arranged in the center of gravity of the (c), And Is that And Is defined by the center of gravity of the container.
7. The method for generating a lifting point of an armor plate for an offshore platform according to claim 4 or 6, wherein the step of judging rationality of the lifting point sequentially comprises the steps of generating an initial lifting point, judging rationality of an oversuspension distance, judging rationality of an included angle and a height, and judging rationality of site construction; The initial lifting point generation comprises the steps of taking an intersection point formed by a lifting point circle and a rod piece as a lifting point, selecting four lifting points for each lifting point circle to generate a lifting scheme, and traversing all lifting schemes; if the outer suspension distance of the hoisting scheme is more than or equal to 6 meters, returning to the step of generating an initial hoisting point; If the distance of the hoisting scheme is less than 6 meters, judging the included angle and the height rationality.
8. The method for generating a lifting point for a deck slab of an offshore platform according to claim 7, wherein the determining of the included angle and the rationality of the height comprises connecting 4 lifting points of each lifting point circle with the circle center, calculating 4 included angles formed between the lifting points and the circle center, and setting an angle threshold value 、 And , Setting a rod height threshold And , ; If the included angle is smaller than Or greater than or equal to Returning to the initial lifting point generation step; if there is an included angle greater than And is smaller than Judging the height of the rod piece where the hanging point is located, if the height of the rod piece is greater than or equal to Judging the rationality of the site construction, if the height of the rod piece is smaller than that of the rod piece And the rod piece where the hanging point is positioned is a main beam, and the on-site construction rationality is judged, if the height of the rod piece is smaller than The rod piece where the hanging point is located is not a main beam, and the initial hanging point generating step is returned; if the included angle is greater than or equal to And less than or equal to Judging the height of the rod piece where the hanging point is located, if the height of the rod piece is greater than or equal to Judging the rationality of the site construction, if the height of the rod piece is smaller than that of the rod piece Returning to the initial lifting point generation step.
9. The method for generating the lifting points of the deck plates of the offshore platform according to claim 8, wherein the method is characterized in that the rationality judgment of site construction is realized by using mechanical software, connecting lifting ropes based on 4 lifting points of a deck plate model and a lifting point circle, and calculating a UC value, wherein the UC value is the ratio of the actual stress and the allowable stress of a member.
10. The method for generating the deck slab hanging point of the offshore platform according to claim 9, wherein for the generation of the single crane hanging point, if the UC value is less than 1 and the matched sling and crane station are present in the construction site, the current hoisting scheme is judged to pass the check, and the deck slab hanging point is generated; If the UC value is less than 1 and the matched sling or crane station position does not exist in the construction site, giving up a single crane scheme and selecting a double crane scheme; If the UC value is greater than or equal to 1, returning to the initial lifting point generation step; for the generation of double crane hanging points, if the UC value is smaller than 1 and the matched sling and crane station position exist in the construction site, judging that the current hoisting scheme passes the check to generate a deck plate hanging point; if the UC value is less than 1 and the construction site does not have a matched sling or crane station, giving up to generate a lifting point; if the UC value is greater than or equal to 1, returning to the initial lifting point generation step.

Description

Offshore platform deck plate lifting point generation method Technical Field The invention discloses a method for generating a lifting point of a deck strip of an offshore platform, and belongs to the technical field of ships and ocean engineering. Background Offshore platform deck slabs are used as the core component of the platform and are typically constructed as large, complex space truss systems. In the construction and installation process of ocean engineering, the hoisting of the armor plate is a key process, and the safety of the armor plate is directly related to success and failure of the whole project. Currently, the choice of deck plate hanging points is mostly dependent on engineers' experience and manual trial calculations. Firstly, an engineer determines the number of cranes and the positions of approximate hanging points according to rough estimation, then strength check is carried out through mechanical calculation software, if the check does not pass, the adjustment hanging points are returned, and the loop is repeated until a feasible scheme is found. The method has the obvious defects that firstly, the efficiency is low, the design period is long and complex structural forms are difficult to deal with due to high dependence on manual experience, secondly, the scheme is not optimal, manual trial calculation is difficult to traverse all possible lifting point combinations, local optimal solutions are easy to fall into, safer and more economical lifting schemes can be omitted, thirdly, hidden dangers exist in safety, certain key stress points or potential stability risks (such as non-uniform stress caused by unreasonable lifting rope included angles and overlong outer suspension distances of the lifting points) can be omitted through empirical selection, and uncertainty risks are brought to large-scale and high-value deck plate lifting operation. Disclosure of Invention The invention aims to provide a method for generating lifting points of a deck strip of an offshore platform, which aims to solve the problems of how to realize automatic lifting point generation, how to traverse and evaluate a large number of candidate lifting point combinations and how to establish a reasonable scheme which accords with site construction resources in the prior art. A method for generating a lifting point of an armor plate of an offshore platform comprises the following steps: Reading a deck plate parameter file by using a computer, calculating the weight and the gravity center position of the deck plate, constructing a deck plate model by using mechanical software, adjusting the gravity center of the deck plate model based on an equivalent moment method, reading crane information in a database, setting a deck plate weight threshold, selecting a single crane if the weight of the deck plate is smaller than the weight threshold, and selecting a double crane if the weight of the deck plate is larger than or equal to the weight threshold; Constructing a distance set according to the distance between the center of gravity of the deck plate and the connecting point of each rod piece, setting an axis threshold value, deleting an invalid distance, and obtaining a calibrated distance set; for the selection of the single crane hanging point, the center of gravity is taken as the center of a circle, and the calibrated distance set is taken as the radius to construct a hanging point circle; and carrying out lifting point rationality judgment based on the intersection point formed by the lifting point circle and the rod piece, and finally generating the lifting point of the armor plate. Calculating the weight of the deck plate: ; In the formula,Is the cross-sectional area of the rod member,For the length of the rod member,For the density of the rod members,For indexing the rod members, the index is provided,,For the total number of bars to be the total number of bars,Is the firstThe cross-sectional area of the root shaft,Is thatThe length of the root rod piece is equal to the length of the root rod piece,Is thatThe density of the root bars; calculating the center of gravity of a rod : ; In the formula,Is the starting point coordinates of the rod piece,Is the end point coordinates of the rod piece,Is the firstThe starting point coordinates of the root pin,Is the firstEnd point coordinates of the root rod; Calculating the center of gravity of deck plate : ; Constructing deck plate model by using mechanical softwareDividing the armor plate model into 4 quadrants for the origin, searching four points with maximum moment according to a greedy algorithm, and firstly confirming the distance in a second quadrantThe furthest rod intersection point is taken as the node of the second quadrantThe coordinates areToHorizontal line is made for the centerAnd perpendicular line,Forming an intersection with the lever member in the first quadrant, selecting andThe furthest intersection point is taken as a first quadrant nodeThe coordinate