Ocean platform lifting system assembly installation method and lifting system

Abstract

The invention discloses an ocean platform lifting system assembly installation method and a lifting system. The method comprises the following steps that 1, the lifting system is divided into a plurality of subsections according to the upper part and the lower part; 2, each section is subjected to independent horizontal building; step 3, respectively turning over and normally hoisting the lower part subsections to finish the connection of the annular cross beam and normally hoisting the upper part subsections to form a lifting system block; 4, wear-resisting plate installation, wherein after the lifting system block is welded, the wear-resisting plate is installed and welded; and 5, carrying the whole lifting system. According to the method, the lifting system is divided into sections, after synchronous manufacturing of all the sections is completed, the liner tool is arranged on the ground-free jig frame, the sections form a complete block, then the whole block is hoisted and carried, and the construction manufacturing period of the lifting system is shortened.

Description

Technical Field

[0001] The invention relates to the field of marine platform construction, and in particular to a marine platform lifting system assembly installation method and a lifting system. Background Art

[0002] The offshore platform lifting system consists of four parts: pile shoes, main hull, lifting system, and pile legs. The installation of the lifting system requires extremely high precision. To ensure the quality of construction, it is often necessary to lift it separately during the docking stage before construction. The construction period is long, which greatly restricts the launch time of the offshore platform. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an installation method of an offshore platform lifting system assembly and a lifting system. The lifting system is divided into sections, and after the synchronous production of each section is completed, an inner tank tooling is set on a groundless ox tire frame, and the sections are assembled into a complete section, which is then hoisted and loaded as a whole, thereby shortening the construction and production period of the lifting system.

[0004] The object of the present invention is achieved through the following technical solutions, a method for installing a marine platform lifting system assembly, comprising the following steps:

[0005] Step 1: Divide the lifting system into multiple sections according to the upper and lower parts;

[0006] Step 2: Each segment is individually constructed horizontally;

[0007] Step 3: Turn over and hoist the lower sections in a normal state respectively, complete the connection of the annular crossbeam, and hoist the upper sections in a normal state to form the lifting system section;

[0008] Step 4: Wear-resistant plate installation: After the welding of the lifting system is completed, the wear-resistant plate is installed and welded;

[0009] Step 5: Install the lifting system as a whole.

[0010] Preferably, in step 1, the lifting system is divided into 5 sections, wherein the upper part includes 1 section and the lower part includes 4 sections.

[0011] Preferably, in step 2, the segmented horizontal manufacturing includes: machining, horizontal installation of the lifting unit equipment, horizontal installation of the annular crossbeam and the mounting of the center annular wear-resistant plate.

[0012] Preferably, in step 3, a groundless cattle tire frame is used, and an inner liner tooling is arranged on the groundless cattle tire frame.

[0013] Preferably, in step 4, before welding the wear-resistant plate, the inner diameter data of the central annular cylinder needs to be measured.

[0014] Preferably, in step 5, the method for mounting the lifting system as a whole comprises: first hoisting the pile shoes, then hoisting and welding the main hull, then hoisting and welding the lifting system section, and then hoisting and welding the pile legs to complete the entire installation of the lifting system.

[0015] In addition to providing a method for installing a marine platform lifting system assembly, the present invention further provides a marine platform lifting system manufactured using the method.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The invention provides a method for installing a total assembly of an offshore platform lifting system and a lifting system, which ensures construction quality and shortens the construction period through key steps such as segmentation, segmentation production, segmentation assembly, wear-resistant plate installation, and overall mounting of the total segment. The invention divides the lifting system into segments, completes the synchronous production of each segment, sets an inner tank tooling on a groundless ox tire frame, assembles the segments into a complete total segment, and then hoists and mounts the entire segment, thereby shortening the construction and production period of the lifting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of the installation method of the overall assembly of the offshore platform lifting system of the present invention;

[0019] Figure 2 It is a side view after segmentation in an embodiment of the present invention;

[0020] Figure 3 It is a top view after segmentation in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of a tire frame of segments 721 / 722 / 723 in an embodiment of the present invention;

[0022] Figure 5 It is a top view of the tire position on the rear plate of the segment 721 / 722 / 723 in the embodiment of the present invention;

[0023] Figure 6 This is a B-direction view of the top view of the rear plate of the segment 721 / 722 / 723 in the embodiment of the present invention;

[0024] Figure 7 Schematic diagram of a tire frame of segments 740 / 741 / 742 / 743 in an embodiment of the present invention;

[0025] Figure 8 It is a side view of a groundless cattle tire stand in an embodiment of the present invention;

[0026] Fig. 9 A top view of an inner container according to an embodiment of the present invention;

[0027] Fig.10is a top view of a chassis in an embodiment of the present invention;

[0028] Fig.11 It is a side view of the segmented assembly stage in an embodiment of the present invention;

[0029] Fig.12 It is a top view of the segmented assembly stage in an embodiment of the present invention;

[0030] Fig.13 This is a schematic diagram of the installation of the wear-resistant plate in an embodiment of the present invention;

[0031] Fig.14 This is a schematic diagram of the welding of the overall section in an embodiment of the present invention;

[0032] Fig.15 It is a diagram showing the sequence of loading the pile leg surrounding well area in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] like Figure 1 As shown, the technical solution of the present invention provides a method for installing an overall assembly of an offshore platform lifting system, which specifically includes the following steps:

[0035] Step 1: Segment division: Divide the lifting system into 5 segments, the lower part is divided into 4 segments A\B\C\D, and the upper part is divided into 1 segment E. Each segment is made separately and synchronously;

[0036] Step 2, segment production: segment A\B\C\D is produced in horizontal state, the round sleeve and other machining are completed in horizontal state, the lifting unit equipment is installed in horizontal state, and the annular beam is installed in horizontal state. Segment E is produced in normal state, and the center annular wear-resistant plate is mounted;

[0037] Step 3, segment assembly: Make a floorless ox tire frame and set the inner tank tooling, turn over and hoist segments A\B\C\D respectively, complete the connection of the annular beam, hoist segment E normally, and form the lifting system segment;

[0038] Step 4: Wear-resistant plate installation: After the welding of the lifting system is completed, measure the inner diameter of the central annular cylinder and accurately install and weld the wear-resistant plate;

[0039] Step 5: Load the entire section: first hoist the pile shoes, then hoist and weld the main hull, then hoist and weld the lifting system section, then hoist and weld the pile legs, and complete the entire installation of the lifting system.

[0040] In one embodiment of the present invention, the method of loading the lifting system assembly is as follows:

[0041] 1. Production of segmented tire frame for mounting frame (lower part), marking of upper tire

[0042] The mounting frame segments (segments A\B\C\D) are independent pieces similar to rectangular blocks, with a small cross-section at the bottom and a high center of gravity. After the lifting unit equipment is installed, the center of gravity is sideways to one side of the segment, and it cannot stand vertically by itself. At the same time, the positioning accuracy of the segments is extremely high, with an error of ±1mm relative to the center. If the segment hoisting positioning cannot be sufficiently constrained and fixed, the subsequent control of welding deformation and the installation accuracy of the wear-resistant plate will be greatly affected. Therefore, a crossbeam modular tire frame is now manufactured to ensure sufficient strength as the constraint base surface of the lower end of the mounting frame segment, eliminating the extra work of piling on the ground to make ground bulls for fixing.

[0043] On the manufactured tire frame, a unified positioning reference center and angle line are set as the positioning ground sample reference line for each segment, which can realize multi-segment synchronous lifting and positioning and improve the lifting and positioning efficiency.

[0044] 2. Install the frame in sections and position it for initial hoisting

[0045] The four mounting frame segments (segments A\B\C\D) are hoisted onto the tire frame at the same time, and the ground sample reference line and the center line of the segment are used for calibration. With the help of the inner tank tooling (the diameter of the inner tank tooling is consistent with the positioning data of the mounting frame segment, and the lifting is completed when the two are in contact), as an auxiliary limit fulcrum, each segment is quickly positioned initially to speed up the lifting efficiency. At the same time, the tire frame and the lower end of the segment are intermittently welded to ensure that the positioning data is not easily changed. Combined with the welding connection of the inner tank tooling, sufficient support points are formed to ensure that the segment is stable and safe to avoid the risk of tipping.

[0046] 3. Install the frame in sections and install the lower cross

[0047] After the initial positioning of the 4 mounting frame sections (sections A\B\C\D), a cross is installed near the lower opening to further strengthen the lower opening. A light target is installed on the cross to be used for subsequent upper and lower light target wire pulling measurements.

[0048] 4. The installation frame is divided into sections and the center is built inside

[0049] Scaffolding is erected inside the structure formed by the four installation frame sections (sections A\B\C\D) to meet the construction needs of the subsequent pile frame section (section E) and wear-resistant plates.

[0050] 5. Install the frame in sections and install the upper cross

[0051] The 4 mounting frames are divided into sections (sections A\B\C\D). A cross is installed near the upper opening to further strengthen the lower opening. A light target is installed on the cross to be used for subsequent upper and lower light target wire pulling measurements.

[0052] 6. The mounting frame is segmented, accurately positioned, and the lower opening is welded with restraint welding.

[0053] With the assistance of the liner tooling, the upper and lower crosses, and the tire frame, the four mounting frame segments (segments A\B\C\D) are now synchronously and accurately positioned. After adjusting the data between each other to the qualified range (the data between the axis of each lifting unit equipment and the data of the positioning reference center, the accuracy error is <±1mm), the lower mouth of the four mounting frame segments (segments A\B\C\D) is positioned and constrained by the tire frame, the center and the liner tooling / and the cross tooling. Each weld is 100mm long, so that the four mounting frame segments (segments A\B\C\D) form a rigid whole to prevent deformation.

[0054] 7. The mounting frame is divided into sections, and the frame is placed under the circular beam (box).

[0055] In the middle area of ​​the 4 mounting frame sections (sections A\B\C\D), a complete circular beam (box) is set between each two. As its own reinforcement member, only one side of the circular beam (box) is installed in the segment production stage, and the remaining side needs to be installed in the general assembly stage. Therefore, it is necessary to set up the scaffolding below the installation position before hoisting. If it is too high, it will affect the hoisting positioning of the circular beam (box).

[0056] 8. Installation frame segmentation, ring beam (box) hoisting and positioning

[0057] Based on the data of the circular beam (box) on one side of the four mounting frame segments (segments A\B\C\D), the circular beam (box) on the remaining side can be quickly hoisted into place to form a complete circular beam (box) reinforcement component, which further strengthens the overall precision control of the four mounting frame segments (segments A\B\C\D).

[0058] 9. The installation frame is divided into sections, and the frame is placed above the circular beam (box)

[0059] Scaffolding is set up above the circular beams (boxes) of the four installation frame sections (sections A\B\C\D) to meet the construction needs of the beams themselves and the construction needs of the periphery of the subsequent pile fixing frame section (section E).

[0060] 10. Pile fixing frame is divided into sections (upper part) and wear-resistant plates are installed in advance

[0061] Before hoisting the pile frame segment (segment E), the wear-resistant plate is mounted on the segment theoretical installation position in advance to facilitate subsequent precise positioning, reduce the subsequent centralized hoisting time, avoid interference with the center's internal scaffolding during hoisting, and reduce construction difficulty.

[0062] 11. Pile frame segmentation, hoisting and precise positioning

[0063] The pile frame segment (Segment E) is hoisted and aligned with the ground sample reference line and the segment’s own center line to complete the precise positioning of the pile frame segment (Segment E).

[0064] 12. Pile fixing frame is divided into sections and the lower end is welded with restraint welding

[0065] The joints between the lower end of the pile fixing frame segment (segment E) and the four mounting frame segments (segments A\B\C\D) are welded with restraint welds, each weld is 100mm long, forming a rigid whole to prevent deformation of the positioning data.

[0066] 13. Installation frame\pile frame segmentation, assembly welding and measurement

[0067] After the installation frame\pile fixing frame is positioned in sections, the assembly of the joints between the sections is carried out, and the accuracy data after assembly is retested to see if it has changed, and then welding is carried out. During the welding process, the steel wire between the upper and lower light targets is used to monitor the data between the sections in real time to ensure that the data is within the qualified range. After welding, the installation frame\pile fixing frame is formed as a whole.

[0068] 14. The surrounding well is divided into sections and the wear-resistant plates are installed in advance

[0069] Before hoisting the shaft sections, the wear-resistant plates should be mounted on the theoretical installation positions of the sections in advance to facilitate subsequent precise positioning, reduce the subsequent centralized hoisting time, avoid interference with the internal scaffolding of the center during hoisting, and reduce the difficulty of construction.

[0070] 15. The well is divided into sections and formed by carrying

[0071] The surrounding well sections are mounted and formed, and the assembly and welding work with the adjacent main hull sections is completed to ensure that the center of the surrounding well is consistent with the main hull benchmark, and related data such as center and verticality meet the design requirements.

[0072] 16. Mounting frame\pile fixing frame, overall mounting and positioning, together with the cross

[0073] The installation frame\pile frame as a whole, together with the upper and lower crosses inside the center, are hoisted and positioned to ensure that after leaving the general assembly frame, the lower ends of the four installation frame sections (sections A\B\C\D) remain relatively fixed and do not deform, avoiding misalignment with the surrounding well structure. The installation frame\pile frame is precisely positioned as a whole to ensure that it is consistent with the center of the surrounding well and the main hull benchmark, and that the center and verticality and other related data meet the design requirements.

[0074] 17. The mounting frame is divided into sections and the lower end is welded with restraint welding.

[0075] The joint between the lower end of the mounting frame segment (segment A\B\C\D) and the surrounding well segment is welded with a restraint weld, each weld is 100mm long, forming a rigid whole to prevent deformation of the positioning data.

[0076] 18. Installation frame\pile fixing frame, center internal frame

[0077] Scaffolding is erected inside the integral formation of the four installation frame sections (sections A\B\C\D) and the pile frame section (section E) to meet the subsequent construction needs of the wear-resistant plates.

[0078] 19. Fix the pile frame\surround the well and install the center light target frame

[0079] A central light target frame is installed at the bottom below the well enclosure segment and at the top above the pile frame segment, so that the pulled steel wire covers the entire highest point to the lowest point, which will be used for subsequent upper and lower light target steel wire pulling measurements.

[0080] 20. Fix the pile frame, surround the well, and install the wear-resistant plate

[0081] After the installation frame and pile fixing frame are accurately positioned, the wear-resistant plate can be installed. During the assembly process, the steel wire between the upper and lower light targets is used for precision testing.

[0082] 21. The mounting frame is divided into sections and assembled synchronously

[0083] The mounting frame segments (segments A\B\C\D) and the closing joints between the wellbore segments are assembled synchronously, and the accuracy data after assembly is re-measured to see if there is any change, to ensure that they are consistent with the wellbore center and the main hull benchmark after assembly, and that related data such as center and verticality meet the design requirements.

[0084] 22. Install the frame in sections and weld the inner tube wall panels

[0085] Priority is given to welding the inner tube wall plate near the center of the joint between the mounting frame segment (segment A\B\C\D) and the surrounding well segment to ensure that the overall data does not deform and provide a basis for the welding of wear-resistant plates. The remaining structures are welded in sequence.

[0086] 23. Wear-resistant plate, both upper and lower parts can be welded

[0087] After the installation frame has completed the welding of the inner cylinder wall plate in sections, the wear-resistant plate can be welded. The upper and lower wear-resistant plates (lower surrounding well wear-resistant plate and upper pile frame wear-resistant plate) can be welded at the same time. During the welding process, the steel wire between the upper and lower light targets is used to monitor the data of the wear-resistant plate and the central ground sample benchmark in real time to ensure that the data is within the qualified range.

[0088] 24. Wear-resistant plate, inspection after upper and lower welding

[0089] After the wear-resistant plate welding is completed and the precision measurement is passed, the completion inspection procedure will be carried out.

[0090] 25. Install the frame\pile frame, dismantle the cross scaffolding

[0091] After the inspection of the wear-resistant plate is completed, the scaffolding in the cross area of ​​the installation frame\pile frame is removed to remove obstructions for the subsequent lifting of the cross.

[0092] 26. Pile fixing frame, installation frame, well enclosure, removal of cross light target

[0093] Remove the pile frame, installation frame, cross and light target surrounding the well, and lift them out of the internal area as a whole.

[0094] 27. Pile fixing frame, installation frame, well enclosure, scaffolding repair, grinding and painting

[0095] Add internal scaffolding, deal with the footings left after the removal of the cross, then carry out overall painting and repainting of the internal area and conduct inspection work.

[0096] 28. Pile fixing frame, installation frame, well enclosure, overall removal of scaffolding

[0097] After the internal painting work is completed, the entire internal scaffolding is dismantled to remove obstructions for the subsequent pile leg insertion.

[0098] 29. Pile shoe, adjust level and angle

[0099] The pile shoe accurately adjusts the horizontality, longitudinal and transverse angles to ensure consistency with the center of the surrounding well and the main hull benchmark. The center, verticality and other related data meet the design requirements and meet the requirements for precise docking after the pile legs are hoisted.

[0100] 30. Pile legs, pile insertion, assembly and welding

[0101] The pile legs are hoisted and mounted, docked and positioned with the pile shoes, and the accuracy data is ensured to be consistent with the center of the surrounding well and the main hull benchmark. The center and verticality and other related data meet the design requirements. The pile legs and pile shoes are assembled and welded.

[0102] 31. Pile legs, close test\re-coating

[0103] After the welding inspection of the pile leg and pile shoe is completed, a tightness test is carried out and then the paint re-application operation is carried out.

[0104] 32. Legs, lift

[0105] Before the platform is launched into the water, the pile legs and pile shoes are lifted to ensure that the pile legs and lifting unit equipment system can work normally and operate effectively.

[0106] In another embodiment of the present invention, another method for installing an overall assembly of an offshore platform lifting system is provided:

[0107] like Figures 2 to 3 As shown, in this embodiment, the segments are divided into upper and lower parts, the upper part is 740; the lower part is centrally symmetrical, 721 / 722 / 723; and the horizontal part is 741 / 742 / 743, a total of 7 segments.

[0108] like Figures 5 to 10 As shown, in this embodiment, the steps of making the segments 721 / 722 / 723 include: making a tire frame →

[0109] The upper structure of the tire frame is completed in horizontal state → stress relief treatment → painting → machining of the round sleeve base → installation of the lifting unit; the production steps of sections 740 / 741 / 742 / 743 include: production of the tire frame → the upper structure of the tire frame is completed in normal state → painting.

[0110] Then perform segmentation grouping, such as Figures 11 to 13 As shown: Make a groundless tire frame, hoist 721→722→723→741→742→743→740 in sequence; weld 721 / 722 / 723 / 741 / 742 / 743 / 740; measure the wear-resistant plate data → machine the wear-resistant plate → install the wear-resistant plate.

[0111] Further, the main hull and each section are mounted and welded, the pile legs and pile shoes are welded, and finally the lifting system is debugged. Fig.14 As shown, in the pile leg surrounding well area, the loading sequence is as follows Fig.15 As shown, from bottom to top are: pile shoes, surrounding shaft, lifting system section, first section of pile legs and remaining pile legs.

[0112] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for installing a marine platform lifting system assembly, characterized in that: The method comprises the following steps: Step 1: Divide the lifting system into multiple sections according to the upper and lower parts; Step 2: Each segment is individually constructed horizontally; Step 3: Turn over and hoist the lower sections in a normal state respectively, complete the connection of the annular crossbeam, and hoist the upper sections in a normal state to form the lifting system section; Step 4: Wear-resistant plate installation: After the welding of the lifting system is completed, the wear-resistant plate is installed and welded; Step 5: Install the lifting system as a whole.

2. The method for installing a marine platform lifting system assembly as claimed in claim 1, characterized in that: In step 1, the lifting system is divided into 5 sections, wherein the upper part includes 1 section and the lower part includes 4 sections.

3. A method for installing an overall assembly of an offshore platform lifting system according to claim 2, characterized in that: In the step 2, the segmented horizontal manufacturing includes: machining, horizontal installation of the lifting unit equipment, horizontal installation of the annular crossbeam and the mounting of the center annular wear-resistant plate.

4. A method for installing an offshore platform lifting system assembly as claimed in claim 3, characterized in that: In the step 3, a groundless tire frame is used, and an inner liner tooling is arranged on the groundless tire frame.

5. The method for installing the overall assembly of the offshore platform lifting system according to claim 4, characterized in that: In step 4, before welding the wear-resistant plate, the inner diameter data of the central annular cylinder needs to be measured.

6. A method for installing an overall assembly of an offshore platform lifting system according to claim 5, characterized in that: In step 5, the method for mounting the lifting system as a whole includes: first hoisting the pile shoes, then hoisting and welding the main hull, then hoisting and welding the lifting system section, and then hoisting and welding the pile legs to complete the entire installation of the lifting system.

7. An offshore platform lifting system, characterized in that: The offshore platform lifting system is manufactured by using the offshore platform lifting system assembly installation method described in any one of claims 1 to 6.

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