A measurement method for deep-water jacket structures

Abstract

This invention discloses a measurement method for deep-water jacket foundation projects, comprising the following steps: Based on the jacket foundation construction plan and three-dimensional line model, precise control of structural segment dimensions is achieved using coordinate control; during project construction, the three-dimensional line model is disassembled, and dimensional control points are determined according to drawings; the disassembled line model is then laid out; during the structural segment prefabrication stage, dimensional control points are established on the tie rods according to the laid-out dimensions; and the structural segment dimensions are measured; the position and length of the final assembly opening are precisely controlled by comparing and analyzing theoretical and measured values; the coordinate control method effectively controls the position and length of the final assembly opening, reducing the workload of final assembly opening and overlay work, thereby improving hoisting efficiency, increasing crane utilization, reducing labor input, and achieving the goal of cost reduction and efficiency improvement.

Description

[Technical Field]

[0001] This invention relates to measurement techniques for offshore guide pipe installation, and more particularly to a measurement method for deep-water guide pipe projects. [Background Technology]

[0002] Deepwater jackets for offshore platforms come in various configurations, including 4, 6, and 8 pipes. They are generally constructed horizontally. Unlike shallow-water jackets, deepwater jackets do not have transition sections to serve as intermediate bridges connecting the jacket and the modules. The top of the deepwater jacket will be directly connected to the modules, making dimensional accuracy extremely important. Domestic jacket construction standards require the following span at the top of the jacket: the distance between two adjacent pipes cannot exceed the design size by ±10mm, and the distance between two diagonally opposite pipes cannot exceed the design size by 19mm.

[0003] The most traditional measurement method is for workers to first weld a steel plate to the top of the conduit, then use a steel ruler to find multiple maximum diameters of the conduit in different directions on the steel plate, and then take the average value to find the approximate center of the conduit. Finally, a total station is used to directly measure the coordinates of the center of each conduit. This method is not very accurate due to the large human error, and workers also need to cut the steel plate at high altitude later, which poses safety risks and is not very efficient.

[0004] like Figure 1 and Figure 2 As shown, the measurement method used for the guide tube is as follows: draw a circle of fixed diameter with the center of the intersection of the flower piece or the horizontal piece, mark the highest point of the intersection on each tie rod, and measure the relative distance between the highest points, that is, the span between the intersection of the radius circle and the highest point of the tie rod, as well as the diagonal and horizontal span between the node and the endpoint, to ensure that the relative distance between the tie rods meets the project tolerance requirements.

[0005] However, due to the large size of deep-water jacket structures, the large volume of prefabricated horizontal sections or decorative sections, and the inconsistent lengths of tie rods, the measurement of circles with fixed diameters has limitations. In addition, during the tie rod assembly process, errors in positioning and saddle-cutting have a significant impact on the length of the final assembly opening after tie rod assembly, resulting in errors of varying degrees. Conventional measurement methods cannot effectively control these errors, which may lead to error accumulation. This can result in large-scale trimming or overburden removal during the final assembly stage, increasing the difficulty of final assembly hoisting and spatial dimension control, and increasing project cost.

[0006] Therefore, after the deep-water jacket of the offshore platform is installed at sea, the modules will be directly connected to it. The span of the top pipe of the jacket is the most important factor affecting the installation of the modules. Therefore, during the construction of the deep-water jacket on land, it is necessary to accurately control the top size of the jacket. [Summary of the Invention]

[0007] This invention provides a measurement method for deep-water jacket projects. By using coordinate control, the position and length of the assembly port are effectively controlled, reducing the workload of the assembly port and the length of the material, thereby improving hoisting efficiency, increasing crane utilization, reducing labor input, and achieving the goal of cost reduction and efficiency improvement.

[0008] The technical solution adopted by this invention to solve its technical problem is:

[0009] A measurement method for deep-water jacket foundation projects employs coordinate control to effectively control the position and length of the assembly port. This measurement method includes the following steps:

[0010] Step S1: Based on the construction plan of the erected jacket and the three-dimensional line model, the coordinate control method is used to precisely control the size of the structural segments.

[0011] Step S2: During the project construction process, the three-dimensional line model is disassembled, and the dimensional control points are determined according to the drawings. The disassembled line model is then laid out.

[0012] Step S3: In the prefabrication stage of structural segments, make dimensional control points on the tie rods according to the layout dimensions;

[0013] Step S4: Simultaneously, during the prefabrication stage of structural segments, the dimensions of the structural segments are measured.

[0014] Step S5 involves comparing and analyzing the theoretical and measured values ​​to determine the position and length of the assembly port for precise control.

[0015] Furthermore, step S3 also includes:

[0016] Based on the structural segmentation prefabrication scheme, the corresponding structure is extracted from the three-dimensional line model. According to the drawings and the single-piece drawing of the tie rod, the position of the dimension control point is determined. Taking the inner skin of the 180° line of the tie rod as the reference, the highest point 1 meter away from the pipe opening is used as the dimension control point of the final assembly port.

[0017] Furthermore, step S3 also includes:

[0018] The intersection of the tie rods is the origin of the coordinate system, with the continuous tie rod as the X-axis and the side with more assembly openings as the Y-axis.

[0019] Furthermore, step S4 also includes:

[0020] After the dimensional control points are established, use a total station to check them. Once confirmed to be correct, proceed with the dimensional measurements.

[0021] Furthermore, step S5 also includes:

[0022] The measurement data was analyzed using CAD software to determine the position of the assembly port and the length of the tie rod.

[0023] Furthermore, the method for determining the length of the assembly tie rod in step S5 is as follows: draw a perpendicular line from the measured point to the center line of the tie rod, and compare it with the theoretical position to determine the length of the assembly tie rod.

[0024] The beneficial effects of this invention are:

[0025] The measurement method provided by this invention uses data simulation to determine the length of the assembly port tie rod. Due to the use of a more precise coordinate control method, the position and length of the assembly port can be precisely controlled through data simulation. Corresponding measures can be taken in advance during the ground prefabrication stage, realizing high-precision and efficient measurement of the top dimensions of the deep-water jacket. It can effectively reduce the workload of joint trimming and lining during subsequent assembly, improve hoisting efficiency, increase crane utilization, and reduce manual labor input. [Attached Image Description]

[0026] Figure 1 This is a schematic diagram of the span between the intersection of the measuring radius circle and the highest point of tension in the existing technology;

[0027] Figure 2 This is a schematic diagram of the diagonal and horizontal measurements of the span between nodes and endpoints in the prior art;

[0028] Figure 3 This is a schematic diagram of the three-dimensional line model structure segmentation extraction in this invention;

[0029] Figure 4 This is a diagram showing the control points for the structural panel dimensions in this invention;

[0030] Figure 5 This is a schematic diagram of the simulation analysis of structural fragmentation data in this invention;

[0031] Figure 6 This is a partially enlarged schematic diagram of the calculation of the length of the structural segment tie rod in this invention.

Detailed Implementation Methods

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] A measurement method for deep-water jacket foundation projects employs coordinate control to effectively control the position and length of the assembly port. This measurement method includes the following steps:

[0034] Step S1, as follows Figure 3As shown, based on the construction plan and three-dimensional line model of the erected jacket, Figure 3 The dotted lines in the middle of the dashed frame represent the structural segments to be extracted. The coordinate control method is used to precisely control the size of the structural segments.

[0035] Step S2: During the project construction process, the three-dimensional line model is disassembled, and the dimensional control points are determined according to the drawings. The disassembled line model is then laid out.

[0036] Step S3: In the prefabrication stage of structural segments, make dimensional control points on the tie rods according to the layout dimensions;

[0037] like Figure 4 As shown, based on the structural segmentation prefabrication scheme, the corresponding structure is extracted from the 3D line model, and the positions of the dimensional control points are determined according to the drawings and the individual tie rod drawings. Figure 4 In The graphic symbol represents the position of the assembly port. Taking the inner skin of the 180° line of the tie rod as the reference, the highest point 1 meter away from the pipe opening is used as the size control point of the assembly port. The intersection of the tie rods is the origin of the coordinate system, with the continuous tie rod as the X-axis and the side with more assembly ports as the Y-axis.

[0038] Step S4: Simultaneously, during the prefabrication stage of structural segments, the dimensions of the structural segments are measured. Specifically, after the dimension control points are set, the dimension control points are checked with a total station, and the dimensions are measured after confirming that they are correct.

[0039] Step S5 involves comparing and analyzing theoretical and measured values ​​to determine the position and length of the assembly port for precise control; specifically:

[0040] like Figure 5 As shown, the measurement data is used for simulation analysis via CAD software. Figure 5 In For the actual measurement points, determine the position accuracy of the assembly port and the length of the tie rod.

[0041] Among them, such as Figure 6 As shown, the method for determining the length of the assembly tie rod is as follows: draw a perpendicular line from the measured point to the center line of the tie rod, and compare it with the theoretical position to determine the length of the assembly tie rod; for example... Figure 6 As shown, the distance between the intersection of the vertical line corresponding to the upper horizontal ellipse and the intersection of the vertical line corresponding to the upper vertical ellipse is the difference in the actual length of the tie rod.

[0042] In this embodiment, the coordinate control method is adopted. Through data simulation, the position and length of the assembly port can be precisely controlled. Corresponding measures can be taken in advance during the ground prefabrication stage, which can effectively reduce the workload of repairing the port and adding material during the subsequent assembly, improve hoisting efficiency, increase crane utilization, and reduce manual input.

[0043] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. All equivalent changes made in accordance with the shape, structure and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A measurement method for deep-water jacket foundation projects, employing coordinate control to effectively control the position and length of the assembly port, characterized in that... The measurement method includes the following steps: Step S1: Based on the construction plan of the erected jacket and the three-dimensional line model, the coordinate control method is used to precisely control the size of the structural segments. Step S2: During the project construction process, the three-dimensional line model is disassembled, and the dimensional control points are determined according to the drawings. The disassembled line model is then laid out. Step S3: In the prefabrication stage of structural segments, make dimensional control points on the tie rods according to the layout dimensions; Based on the structural segmentation prefabrication scheme, the corresponding structure is extracted in the three-dimensional line model. According to the drawings and tie rod single piece drawings, the position of the dimension control point is determined. Taking the inner skin of the 180° line of the tie rod as the reference, the highest point 1 meter away from the pipe opening is used as the dimension control point of the final assembly opening. Step S4: Simultaneously, during the prefabrication stage of structural segments, the dimensions of the structural segments are measured. Step S5 involves comparing and analyzing the theoretical and measured values ​​to determine the position and length of the assembly port for precise control.

2. The measurement method for deep-water jacket structures according to claim 1, characterized in that: Step S3 also includes: The intersection of the tie rods is the origin of the coordinate system, with the continuous tie rod as the X-axis and the side with more assembly openings as the Y-axis.

3. The measurement method for deep-water jacket structures according to claim 1, characterized in that: Step S4 also includes: After the dimensional control points are established, use a total station to check them. Once confirmed to be correct, proceed with the dimensional measurements.

4. The measurement method for deep-water jacket structures according to claim 1, characterized in that: Step S5 also includes: The measurement data is used to simulate and analyze the data using CAD software to determine the position of the assembly port and the length of the tie rod.

5. The measurement method for deep-water jacket structures according to claim 1, characterized in that: The method for determining the length of the assembly tie rod in step S5 is as follows: draw a perpendicular line from the measured point to the center line of the tie rod, and compare it with the theoretical position to determine the length of the assembly tie rod.

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