Segmented construction and relay closure process for large offshore oil platform

Abstract

The invention provides a large-scale offshore oil platform segmented construction and relay closure process, and relates to the technical field of offshore oil engineering, the large-scale offshore oil platform segmented construction and relay closure process comprises the following steps: S1, designing a construction scheme; s2, constructing a non-slideway area in a segmented manner; s3, carrying out secondary transfer preparation on each subsection; s4, SPMT segmented transportation relay is carried out; and S5, slideway general assembly integration. According to the construction method, a conventional offshore oil platform construction scheme is optimized, and the process that subsection construction and pre-final assembly are conducted on blocks in a non-slideway area, and then subsections are secondarily shifted to the slideway area for final assembly in an SPMT transportation relay mode is adopted. The problems that slideway resources of an ocean construction site are insufficient, and a large-scale ocean oil platform cannot be constructed on the slideway in a whole period are solved. The construction integration rate of the offshore oil platform is improved, and the construction period of the platform is shortened.

Description

Technical Field

[0001] This invention relates to the field of marine oil engineering technology, and in particular to a process for the segmented construction and relay closure of a large marine oil platform. Background Technology

[0002] During the construction of offshore oil platforms, the construction techniques chosen vary depending on the platform modules being built, the site's construction capabilities, layout, crane capacity, and loading methods. Typically, large and heavy offshore oil platforms are built on slipways, primarily using planar segmented construction. This involves prefabrication of single deck sections or multiple sections per deck layer, with each section welded together and then hoisted into place layer by layer. For 10,000-ton-class modules, depending on lifting capacity and site resources, each deck may consist of 7-8 sections, sometimes even more than a dozen, leading to significant cumulative assembly errors. For more regular large modular structures, vertical construction is considered. This involves prefabricating the entire module along vertical sections and horizontal deck sections, then assembling them piece by piece, resulting in a long assembly cycle. Slipway-based module construction continues throughout the entire construction cycle, resulting in high construction costs.

[0003] With multiple individual units being assembled at the construction site simultaneously and limited slide resources, if the conventional slide assembly method described above is followed, the project's assembly time and sea launch time will be significantly delayed, resulting in a long overall construction cycle. Summary of the Invention

[0004] To address the technical problems of existing technologies that require prefabrication of the entire module into several vertical and horizontal deck sections along the vertical sections, followed by piece-by-piece assembly, resulting in long overall assembly cycles and high construction costs due to module construction on the slipway throughout the entire construction cycle, this invention provides a segmented construction and relay closure process for large offshore oil platforms.

[0005] The present invention provides a segmented construction and relay closure process for a large offshore oil platform, which adopts the following technical solution: A process for segmented construction and sequential closure of a large offshore oil platform includes the following steps: S1. Construction plan design; S2, Non-slide area is constructed in sections; S3. Preparation for secondary transport of each segment; S4 and SPMT segmented transportation relay; S5, slide rail assembly and integration.

[0006] Furthermore, S1 specifically includes: Based on a comprehensive evaluation of platform specifications, weight information, site layout, site resources, and project budget, a design and construction plan is developed. Through strength calculation and analysis, and overall platform structure calculation, the three-dimensional segments and specific construction locations are determined based on the actual site and project conditions. The structures to be pre-assembled for each segment and the secondary transportation routes are also clarified.

[0007] Furthermore, S2 specifically includes: According to the construction plan, conventional non-slide construction methods are adopted to construct each section simultaneously. In accordance with the principles of modularization and integration, each section is prefabricated, pre-outfitted, pre-installed, and pre-assembled.

[0008] Furthermore, S3 specifically includes: After the pre-assembly of each segment is completed, a second relocation of each segment to the slideway is required for final closure and assembly. This mainly includes site layout and transport relay preparation before and after the relocation. Site layout preparation mainly includes slideway area layout preparation and segment construction site layout preparation. Slideway area preparation mainly involves slideway cleaning, slideway block leveling, slide shoe placement and leveling, pier placement, temporary support, and transport support layout. Segment construction area preparation mainly involves the reasonable layout of transport and temporary supports. Transport relay preparation includes the design of relay and vehicle allocation plans, foundation treatment along the transport route, and obstacle removal.

[0009] Furthermore, S4 specifically includes: SPMT transport relay method is used to complete the cross-slide transport of each segment. Before the SPMT transport relay, the transport is simulated according to the vehicle allocation plan, the SPMT layout is optimized, and the site collision is calculated in advance. During the second relocation, according to the vehicle allocation plan and relay plan, the SPMT is used to transport the segment of the block to the slide in sequence. The slide is placed in advance and the smooth shoe is found. After the segment of the block is transported into place, it is placed on it.

[0010] Furthermore, S5 specifically includes: The segmented interface in the process adopts a stepped interface, which can realize the vertical drop of the segments and rapid assembly when the SPMT slowly descends. After the segments are assembled and joined together on the slide, they are finally assembled.

[0011] Furthermore, when designing the scheme for S1, the safety, feasibility, and ground bearing capacity of the secondary relocation and transportation route should be fully considered, as well as the structural strength and the convenience of subsequent assembly.

[0012] Furthermore, the step preceding S2 includes: In the traditional way, before constructing sections in non-slide areas, the site needs to be cleared and leveled, and temporary and transport supports need to be arranged reasonably.

[0013] Furthermore, before S4, the steps include: laying and leveling the slide blocks and paving them firmly before placing the slide shoes; laying the slide plates and Teflon plates according to technical requirements; raising the temporary support blocks by at least 100mm of concrete mortar and leveling them before relocation; simulating the transportation process, optimizing the SPMT layout, and calculating site collisions in advance; inspecting the SPMT entry, transportation route, and area under the modules, mainly checking for obstacles on the transportation route, whether there are possible collisions between the SPMT's position under the module and the final assembly support blocks, and raising and leveling the temporary support blocks after relocation and measuring them to ensure that the temporary support blocks can touch the ground when the modules fall.

[0014] Furthermore, after S5, the procedure also includes the step of periodically monitoring and adjusting the uneven settlement at the slide assembly position.

[0015] In summary, the beneficial effects of the present invention are as follows: 1. Traditional slipway construction methods require the slipway to be used throughout the entire construction cycle of a large offshore oil platform. The present invention, based on the site layout, divides large modules into two independent segments and places them in a non-slipway area for simultaneous segmented construction. These segments are then transported to the slipway area via SPMT relay for final assembly. This avoids reliance on and long-term occupation of slipway resources during the construction of large offshore oil platforms, thus improving assembly and construction efficiency.

[0016] 2. Traditional construction methods use concave-convex interfaces for segmented closure joints, which are difficult and risky to assemble. The present invention designs the segmented closure joints as stepped interfaces, which allows the segments to fall vertically and be positioned during closure, avoiding the need for deck piece translation and adjustment. This ensures the overall assembly accuracy of the deck pieces while avoiding structural interference during translation, making assembly convenient, efficient, and saving crane resources.

[0017] 3. The process of this invention improves the integration rate of the project, reduces the workload of assembling individual parts and the work of erecting high-altitude scaffolding, painting and repairing, etc., improves the efficiency of platform construction and saves project costs.

[0018] 4. The process of this invention adopts SPMT relay transportation, which ensures the safe transportation of modules in segments while also completing segmented weighing. This avoids the workload of traditional non-slide area construction processes that require weighing systems, designing weighing pads, jack support plates, and lifting ring plates, as well as removing the weighing pads and jacks after weighing, thus improving the platform's weighing efficiency. Simultaneously, it avoids transporting large structures with SPMT loads across slide curves, reducing transportation risks.

[0019] 5. The process of this invention is highly versatile and applicable to the construction of offshore oil blocks, modules, etc., especially suitable for the segmented construction of non-slipway areas of large offshore oil platforms and the situation of sliding and loading onto ships after the completion of the overall assembly and closure construction in the slipway area. Attached Figure Description

[0020] Figure 1 A process flow diagram provided for the process of this invention; Figure 2 This is a schematic diagram of the segmented planar division in an embodiment of the process application of the present invention; Figure 3 This is a schematic diagram of the relay step one in the application embodiment of the process of this invention; Figure 4 This is a schematic diagram of the relay step two in an embodiment of the application of the process of this invention; Figure 5 This is a schematic diagram of the relay step three in the application embodiment of the invention process of this method; Figure 6 This is a schematic diagram of the relay step four in the application embodiment of the invention process of this method; Figure 7 This is a schematic diagram illustrating the relay completion of the northern module in an embodiment of the application of the invention's process. Figure 8 This is a schematic diagram of step five in the application embodiment of the process of this invention. Figure 9 This is a schematic diagram of step six in the application embodiment of the invention process of this method; Figure 10 This is a schematic diagram illustrating the relay completion of the north and south modules in an embodiment of the application of the invention's process.

[0021] In the diagram: 1. North Module; 2. South Module; 3. North Module DSU; 4. South Module DSU; 5. North Module Main Column; 6. South Module Main Column; 7. Right Side Slide Block; 8. Right Side Slide Shoe; 9. Left Side Slide Block; 10. Left Side Slide Shoe; 11. North Module Main Column Support Pedal; 12. North Module Column Temporary Support; 13. First Portal Support; 14. Second Portal Support; 15. Third Portal Support; 16. North Module Support Pedal; 17. North Module Temporary Support; 18. Fourth Portal Support; 19. Fifth Portal Support; 20. South Module Support Pedal; 21. South Module Temporary Support; 001. First SPMT Car Group; 002. Second SPMT Car Group; 003. Third SPMT Car Group; 004. Fourth SPMT Car Group; 005. Fifth SPMT Car Group. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0023] like Figures 1-10 As shown in the figure, an embodiment of the present invention provides a segmented construction and relay closure process for a large offshore oil platform, comprising the following steps: S1. Construction plan design.

[0024] Specifically, based on a comprehensive evaluation of platform specifications, weight information, site layout, site resources, and project budget, a design and construction plan is developed. Through strength calculation analysis and overall platform structure calculation, the three-dimensional segments and the structures requiring pre-assembly for each segment, their specific construction locations, and secondary transportation paths are determined according to the actual site and project conditions. In this embodiment, the module is divided into two three-dimensional segments: a north module 1 and a south module 2. The north module 1 is located in the vacant area on the right side of the slide, and the south module 2 is located in the vacant area on the left side of the slide. The north and south modules are constructed simultaneously in a conventional manner.

[0025] S2, Non-slide area is constructed in sections.

[0026] According to the construction plan, the two three-dimensional modules in the north and south are constructed simultaneously using conventional non-slide (ground) construction methods. In accordance with the principles of modularization and integration, each segment is prefabricated, pre-outfitted, pre-installed, and pre-assembled.

[0027] S3. Preparation for secondary transport of each segment.

[0028] After the pre-assembly of the north and south modules is completed, they need to be moved twice to the sliding track for final closure and assembly. Preparation for the second relocation mainly includes site layout and transport relay preparation before and after the relocation. Site layout preparation mainly includes the preparation of the sliding track area and the section construction area. The preparation of the sliding track area mainly involves cleaning the track, leveling the track blocks, placing and leveling the sliding shoes, setting up assembly blocks, temporary supports, and arranging transport supports. The preparation of the section construction area mainly involves the reasonable layout of transport supports and temporary supports. Transport relay preparation includes the design of relay and vehicle allocation plans, foundation treatment along the transport route, and obstacle removal.

[0029] S4 and SPMT segmented transportation relay.

[0030] To avoid the risks associated with long-distance and sharp-turn transportation of the SPMT load modules along the slide, this embodiment employs a relay transportation method to achieve secondary movement of the modules, first moving the north module 1 and then the south module 2. The specific relay method is as follows: like Figure 3 , 4 As shown, the system has a left-side slide block 9, on which a left-side sliding shoe 10 is installed. Before moving the North Module 1, a third portal support 15 is arranged at a preset position between the slide blocks. The first SPMT trainset 001 and the second SPMT trainset 002 drive under the first portal support 13 and the second portal support 14 respectively, simultaneously lifting the North Module 1, removing the temporary support 12 of the North Module column and the main column pad 11 of the North Module, and the two SPMT trainsets move to the left to the vicinity of the right-side slide block 7 to ensure effective contact between the North Module 1 and the third portal support 15.

[0031] like Figure 5 , 6 As shown, the third SPMT train 003 takes over and drives under the third portal support 15. The first SPMT train 001 and the third SPMT train 003 simultaneously lift the module to a certain height. The second SPMT train 002 carries the second portal support 14 away from the north module. The first SPMT train 001 and the third SPMT train 003 simultaneously move to the left until the north module DSU3 is directly above the right sliding shoe 8.

[0032] like Figure 7 As shown, the main support pier 11 and temporary support 12 of the north module are repositioned below the main support column 5 of the north module. The first SPMT trainset 001 and the third SPMT trainset 003 simultaneously lower the module to smoothly compact the right-side sliding shoe 8 and the temporary support 12 of the north module support column. The support pier 16 and temporary support 17 of the north module are then arranged according to the plan. The first SPMT trainset 001, carrying the first gantry support 13, evacuates the module, and the third SPMT trainset 003, carrying the third gantry support 15, evacuates the module. The north module is then successfully repositioned.

[0033] like Figure 8 , 9 As shown, when moving the south module 2, the fourth SPMT trainset 004 and the fifth SPMT trainset 005 respectively drive under the fourth portal support 18 and the fifth portal support 19, simultaneously lifting the module and removing the temporary support and main column pad under the main column 6 of the south module. The two SPMT trainsets simultaneously continue to move the module to the right to the vicinity of the right slide block 7. The south module DSU4 is located directly above the left slide shoe 10, and the module is simultaneously lifted so that the south module is slightly higher than the already positioned north module, aligning with the stepped cut. The SPMTs slowly descend, vertically lowering the south module 2 to ensure complete assembly with the north module 1. After assembly, the main column pad and main column support are repositioned under the main column, and the south module support pad 20 and the south module temporary support 21 are installed according to the plan. The fifth SPMT trainset 005 drives away from the module with the fifth portal support 19, and the fourth SPMT trainset 004 drives away from the module with the fourth portal support 18.

[0034] like Figure 10 As shown, the north and south modules complete their closure on the slide through a secondary transfer relay.

[0035] S5, slide rail assembly and integration.

[0036] The segmented interface in the process adopts a stepped interface, which can realize the vertical drop of the segments and rapid assembly when the SPMT slowly descends. After the segments are assembled and joined together on the slide, they are finally assembled.

[0037] In this embodiment of the invention, the portal support can also be retained until the entire module is assembled, depending on the actual needs on site.

[0038] In this embodiment of the invention, when designing the scheme in S1, the safety, feasibility and ground bearing capacity of the secondary relocation and transportation route should be fully considered, and factors such as structural strength and the convenience of subsequent assembly should also be comprehensively considered.

[0039] In this embodiment of the invention, before step S2, the method further includes: clearing and leveling the site before constructing the section in the non-slide area in a conventional manner. This requires the reasonable design and arrangement of portal-type temporary supports and transport supports.

[0040] In this embodiment of the invention, before step S4, the following steps are included: before placing the skids, leveling and compacting the skid blocks as required, and laying the skid plates and Teflon plates according to technical requirements. Before relocation, the temporary support blocks are raised by at least 100mm of concrete mortar and leveled; the transportation process is simulated to optimize the SPMT layout and calculate site collisions in advance; the SPMT entry, transportation route, and area under the modules are inspected, mainly including obstacles on the transportation route, whether there are possible collisions between the SPMT's position under the module and the final assembly support blocks, etc. Obstacles are cleared in advance. After relocation, the temporary support block position also needs to be raised, leveled, and measured to ensure that the temporary support block can touch the ground when the module falls.

[0041] In this embodiment of the invention, after step S5, the method further includes: periodically monitoring and adjusting the uneven settlement at the assembly position of the slideway.

[0042] This invention is applicable to situations where large modular construction orders are undertaken during periods of limited slideway resources and site space constraints. Based on the specific conditions of the construction site, large modules are segmented, constructed and pre-assembled simultaneously in non-slideway areas, and then moved a second time to the slideway for final assembly. This eliminates the reliance on slideways during module construction, overcomes site location limitations, and improves construction efficiency. During the secondary segment relocation, a SPMT (Special Purpose Transport Machine) relay method is used to transport the modules segment by segment to the slideway for final assembly. This avoids the situation of transporting large structures across slideway curves with SPMT loads, reducing transportation risks. According to the new process, gantry transport supports and temporary supports need to be designed to facilitate segmented transport relay and positioning. This invention replaces the traditional concave-convex interface with a stepped interface, enabling vertical descent and rapid assembly of deck panels during hoisting. While ensuring the overall assembly accuracy of deck panels, it avoids complex assembly and adjustment steps, reduces deck panel assembly time, and improves slideway assembly efficiency.

[0043] The process of this invention has the following advantages: Traditional slipway construction methods require the slipway to be used throughout the entire construction cycle of a large offshore oil platform. This invention, based on site layout, divides large modules into two independent segments and places them in a non-slipway area for simultaneous segmental construction. These segments are then transported to the slipway area via SPMT (Special Purpose Transport Machine) for final assembly. This avoids reliance on and long-term occupation of slipway resources during the construction of large offshore oil platforms, improving assembly and construction efficiency.

[0044] Traditional construction methods use concave-convex interfaces for segmented closure joints, which are difficult and risky to assemble. This invention designs the segmented closure joints as stepped interfaces, enabling vertical lowering and positioning of segments during closure. This avoids the need for horizontal adjustment of the deck panels, ensuring overall assembly accuracy while preventing structural interference during translation. Assembly is convenient, efficient, and saves crane resources.

[0045] The process of this invention improves the integration rate of the project, reduces the workload of assembling individual parts and the work of erecting high-altitude scaffolding, painting and repairing, etc., improves the efficiency of platform construction and saves project costs.

[0046] This invention employs SPMT relay transportation, ensuring safe segmented transport of modules while simultaneously enabling segmented weighing. This avoids the workload of traditional non-slide area construction methods that require weighing systems, designing weighing pads, jack support plates, and lifting rings, as well as removing the weighing pads and jacks after weighing. This significantly improves platform weighing efficiency. Furthermore, it avoids transporting large structures with SPMT loads across slide curves, reducing transportation risks.

[0047] The process of this invention is highly versatile and applicable to the construction of offshore oil blocks and modules, especially suitable for the segmented construction of non-slipway areas of large offshore oil platforms and the situation of sliding and loading onto ships after the completion of the overall assembly and closure of the slipway area.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. The various components mentioned in this invention are common technologies in the existing field. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents. .

Claims

1. A segmented construction and relay closure process for a large offshore oil platform, characterized in that, Includes the following steps: S1. Construction plan design; S2, Non-slide area is constructed in sections; S3. Preparation for secondary transport of each segment; S4 and SPMT segmented transportation relay; S5, slide rail assembly and integration.

2. The segmented construction and relay closure process for a large offshore oil platform according to claim 1, characterized in that, S1 specifically includes: Based on a comprehensive evaluation of platform specifications, weight information, site layout, site resources, and project budget, a design and construction plan is developed. Through strength calculation and analysis, and overall platform structure calculation, the three-dimensional segments and specific construction locations are determined based on the actual site and project conditions. The structures to be pre-assembled for each segment and the secondary transportation routes are also clarified.

3. The segmented construction and relay closure process for a large offshore oil platform according to claim 1, characterized in that, S2 specifically includes: According to the construction plan, conventional non-slide construction methods are adopted to construct each section simultaneously. In accordance with the principles of modularization and integration, each section is prefabricated, pre-outfitted, pre-installed, and pre-assembled.

4. The segmented construction and relay closure process for a large offshore oil platform according to claim 3, characterized in that, S3 specifically includes: After the pre-assembly of each segment is completed, a second relocation of each segment to the slideway is required for final closure and assembly. This mainly includes site layout and transport relay preparation before and after the relocation. Site layout preparation mainly includes slideway area layout preparation and segment construction site layout preparation. The slideway area preparation mainly involves slideway cleaning, slideway block leveling, slide shoe placement and leveling, pier placement, temporary support, and transport support layout. The segment construction area preparation mainly involves the reasonable layout of transport support and temporary support. Transport relay preparation includes the design of relay plan and vehicle allocation plan, foundation treatment on the transport route, and obstacle removal.

5. The segmented construction and relay closure process for a large offshore oil platform according to claim 1, characterized in that, S4 specifically includes: SPMT transport relay method is used to complete the cross-slide transport of each segment. Before the SPMT transport relay, the transport is simulated according to the vehicle allocation plan, the SPMT layout is optimized, and the site collision is calculated in advance. During the second relocation, according to the vehicle allocation plan and relay plan, the SPMT is used to transport the segment of the block to the slide in sequence. The slide is placed in advance and the smooth shoe is found. After the segment of the block is transported into place, it is placed on it.

6. The segmented construction and relay closure process for a large offshore oil platform according to claim 5, characterized in that, S5 specifically includes: The segmented interface in the process adopts a stepped interface, which can realize the vertical drop of the segments and rapid assembly when the SPMT slowly descends. After the segments are assembled and joined together on the slide, they are finally assembled.

7. The segmented construction and relay closure process for a large offshore oil platform according to claim 2, characterized in that, When designing the scheme for S1, the safety, feasibility, and ground bearing capacity of the secondary relocation and transportation route should be fully considered, as well as the structural strength and the convenience of subsequent assembly.

8. The segmented construction and relay closure process for a large offshore oil platform according to claim 3, characterized in that, The steps preceding S2 include: In the traditional way, before constructing sections in non-slide areas, the site needs to be cleared and leveled, and temporary and transport supports need to be arranged reasonably.

9. The segmented construction and relay closure process for a large offshore oil platform according to claim 5, characterized in that, Before S4, the steps include: laying and leveling the slide blocks and paving them firmly before placing the slide shoes; laying the slide plates and Teflon plates according to technical requirements; raising the temporary support blocks by at least 100mm of concrete mortar and leveling them before relocation; simulating the transportation process, optimizing the SPMT layout, and calculating site collisions in advance; inspecting the SPMT entry, transportation route, and area under the modules, mainly checking for obstacles on the transportation route, whether there are possible collisions between the SPMT's position under the module and the final assembly support blocks, and raising and leveling the temporary support blocks after relocation and measuring them to ensure that the temporary support blocks can touch the ground when the modules fall.

10. The segmented construction and relay closure process for a large offshore oil platform according to claim 1, characterized in that, The step following S5 is to periodically monitor and adjust the uneven settlement at the slide assembly position.

Images