Method of constructing a jack-up platform cruciform jack-up foundation segments

Abstract

This invention belongs to the field of marine engineering equipment manufacturing technology and discloses a construction method for a cross-shaped lifting foundation segment of a self-elevating platform. The lifting foundation segment includes four mounting frame assemblies and four fixed pile frame assemblies, which are alternately connected and enclosed to form a central cylinder. The construction method includes the following steps: prefabricating the mounting frame assemblies; installing the prefabricated mounting frame assemblies onto a jig; installing a fixed pile frame assembly between each two adjacent mounting frame assemblies on the jig; sequentially connecting each component of the fixed pile frame assembly between two adjacent mounting frame assemblies; and creating a slot assembly and installing a guide assembly on the inner wall of the central cylinder formed by the mounting frame assemblies and the fixed pile frame assemblies. This invention can precisely control the diameter of the central cylinder formed by the mounting frame assemblies and the fixed pile frame assemblies, ensuring the manufacturing precision of the central cylinder.

Description

Technical Field

[0001] This invention relates to the field of marine engineering equipment manufacturing technology, and in particular to a method for constructing a cross-shaped lifting foundation segment for a self-elevating platform. Background Technology

[0002] A jack-up platform is a widely used piece of equipment in marine engineering fields such as offshore oil and gas exploration and development, and offshore wind power construction. The core function of a jack-up platform relies on the raising and lowering of its legs. The jacking foundation section is a key support structure for the leg raising and lowering of the jack-up platform, mainly used to bear the vertical and lateral loads generated during the leg raising and lowering process. The cross-shaped jacking foundation section is mainly used for raising and lowering cylindrical legs with four symmetrically arranged racks. The central cylinder and surrounding structure inside the cross-shaped jacking foundation section form a closed box structure. The guide components installed on the central cylinder effectively limit the lateral displacement during leg raising and lowering, ensuring the stability and accuracy of the leg raising and lowering operation.

[0003] In the traditional construction process of cross-shaped lifting foundation segments, to improve production efficiency, the industry typically adopts a method of prefabricating all components before assembling them on a jig, thereby shortening the overall assembly cycle of the cross-shaped lifting foundation segment on the jig. However, if all components are prefabricated before overall assembly, it is difficult to accurately control the diameter of the central cylinder. The manufacturing precision of the central cylinder directly determines the installation precision of the guide components. Once the dimensional deviation of the central cylinder exceeds the allowable range, it will directly affect the guiding effect of subsequent pile leg lifting, and may even lead to problems such as pile leg lifting jamming and uneven load distribution, seriously affecting the construction quality of the cross-shaped lifting foundation segment and the operational safety of the self-elevating platform.

[0004] Therefore, there is an urgent need to propose a construction method for a segmented cross-shaped lifting foundation for a self-elevating platform to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for constructing a segmented cross-shaped lifting foundation for a self-elevating platform, which can accurately control the diameter of the central cylinder formed by the mounting frame assembly and the fixed pile frame assembly, ensuring the manufacturing precision of the central cylinder, thereby ensuring the installation precision of the guide assembly on the inner wall of the central cylinder.

[0006] Based on the above concept, the technical solution adopted by this invention is as follows:

[0007] This invention provides a method for constructing a cross-shaped lifting foundation segment for a self-elevating platform. The lifting foundation segment includes four mounting frame assemblies and four fixed pile frame assemblies, which are alternately connected and enclose a central cylindrical body. The construction method includes the following steps:

[0008] S1. Prefabricate the mounting bracket assembly;

[0009] S2. Install the prefabricated mounting bracket assembly onto the jig;

[0010] S3. On the jig, install a fixed pile frame assembly between each of the two adjacent mounting frame assemblies, and connect each component of the fixed pile frame assembly to the two adjacent mounting frame assemblies in sequence.

[0011] S4. A slot assembly is opened in the inner wall of the central cylinder formed by the mounting frame assembly and the fixed pile frame assembly, and a guide assembly is installed.

[0012] In some embodiments, the mounting frame assembly is configured as a box structure including a first top plate, a lower end assembly, a first outer side plate, a first arc plate, and two connecting plates. The first top plate and the lower end assembly are arranged opposite each other along the height direction. The first outer side plate and the first arc plate are both connected between the first top plate and the lower end assembly and are arranged opposite each other radially along the lifting foundation segment. The first arc plate is part of the inner wall of the central cylinder. The two connecting plates are arranged opposite each other circumferentially along the lifting foundation segment. The two connecting plates are used to connect to the pile fixing frame assembly.

[0013] Step S1 specifically includes:

[0014] S11. Using the first top plate as the base surface, weld the first outer side plate and a connecting plate to the first top plate;

[0015] S12. Weld the lower end component to the first outer side plate and a connecting plate;

[0016] S13. The first arc plate is welded to the first top plate, one of the connecting plates, and the lower end assembly.

[0017] S14. Install another connecting plate, and weld the other connecting plate to the first top plate, the first outer side plate, the lower end assembly, and the first arc plate.

[0018] In some embodiments, the mounting bracket assembly further includes a first partition, the first partition including a first portion and a second portion connected to each other, the first portion being disposed parallel to and spaced apart from the first outer side plate, the second portion being parallel to the connecting plate and extending radially inward relative to the first portion along the lifting base segment, the second portion being used for welding connection to the first arc plate.

[0019] Step S11 further includes: installing the first partition plate on the first top plate, so that the first portion and the second portion are both welded to the first top plate.

[0020] In some embodiments, the mounting bracket assembly further includes a second partition, which is parallel to the connecting plate;

[0021] After step S12, the method further includes: installing the second partition, and welding the second partition to the first top plate, the first outer side plate, the lower end component and the first sub-section.

[0022] In some embodiments, the second partition is welded to the first top plate, the first outer side plate, the lower end assembly, and the first sub-section using a single-sided welding method.

[0023] In some embodiments, at least one of the connecting plates has a process hole, which is then sealed after the mounting bracket assembly is prefabricated.

[0024] In some embodiments, the pile fixing frame assembly includes a second top plate, a bottom plate, a second outer side plate, a second arc plate, and a third partition plate. The second top plate and the bottom plate are arranged opposite each other along the height direction. The second outer side plate and the second arc plate are both connected between the second top plate and the bottom plate and are arranged opposite each other along the radial direction of the lifting foundation segment. The second arc plate and the first arc plate together form the inner wall of the central cylinder. The third partition plate is erected between the second top plate and the bottom plate.

[0025] Step S3 specifically includes:

[0026] S31. The second top plate is connected between two adjacent mounting bracket assemblies, one end of the second top plate is welded to the connecting plate of one of the mounting bracket assemblies, and the other end of the second top plate is welded to the connecting plate of the other adjacent mounting bracket assembly; the second top plate is flush with the first top plate along the height direction.

[0027] S32. Weld the third partition plate to the second top plate;

[0028] S33. Weld the second arc plate to the second top plate and the third partition plate together.

[0029] S34. The base plate is welded to the third partition plate and the second arc plate, and the base plate is welded between two adjacent connecting plates;

[0030] S35. Install the second outer side plate, and weld the second outer side plate to the second top plate, the bottom plate, and the third partition plate.

[0031] In some embodiments, the third partition is provided in multiple ways, and the second outer side plate includes multiple sub-plates, which are welded to the sidewall of the third partition.

[0032] In some embodiments, the sub-plate is welded to the third partition, the second top plate, and the bottom plate using a single-sided welding method.

[0033] In some embodiments, the slot assembly includes a rack slot and a fixed block slot, the rack slot being formed in the first arc plate and the fixed block slot being formed in the second arc plate. The guide assembly includes a first guide plate and a second guide plate, the first guide plate being welded to the first arc plate and the second guide plate being welded to the second arc plate.

[0034] The beneficial effects of this invention are:

[0035] The construction method of the cross-shaped lifting foundation segment of the self-elevating platform provided by the present invention involves first prefabricating the installation frame components and positioning the upper mold, and then disassembling the pile fixing frame components between adjacent installation frame components. This method can accurately control the diameter of the central cylinder formed by the installation frame components and the pile fixing frame components, ensuring the manufacturing precision of the central cylinder. This, in turn, ensures the installation precision of the guide components on the inner wall of the central cylinder, ensuring the guiding effect of the guide components on the pile legs. It avoids problems such as lateral deviation, lifting jamming, and uneven load distribution during the lifting of the pile legs, which is conducive to improving the construction quality and assembly stability of the lifting foundation segment and enhancing the safety and reliability of the pile leg lifting operation. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the lifting foundation segment from one perspective provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the lifting foundation segment from another perspective provided by an embodiment of the present invention;

[0039] Figure 3 This is a prefabricated schematic diagram of the mounting bracket assembly provided in an embodiment of the present invention. Figure 1 ;

[0040] Figure 4 This is a prefabricated schematic diagram of the mounting bracket assembly provided in an embodiment of the present invention. Figure 2 ;

[0041] Figure 5 This is a prefabricated schematic diagram of the mounting bracket assembly provided in an embodiment of the present invention. Figure 3 ;

[0042] Figure 6 This is a prefabricated schematic diagram of the mounting bracket assembly provided in an embodiment of the present invention. Figure 4 ;

[0043] Figure 7 This is a prefabricated schematic diagram of the mounting bracket assembly provided in an embodiment of the present invention. Figure 5 ;

[0044] Figure 8 This is a schematic diagram of the structure of the second partition provided in an embodiment of the present invention;

[0045] Figure 9 This is a schematic diagram of the structure of the mounting bracket assembly provided in this embodiment of the invention after the rack and pinion slot is opened;

[0046] Figure 10 This is a schematic diagram of the structure of the pile fixing frame assembly from one perspective provided in an embodiment of the present invention;

[0047] Figure 11 This is a structural schematic diagram of the pile fixing frame assembly from another perspective provided in an embodiment of the present invention;

[0048] Figure 12 This is an exploded structural diagram of the pile fixing frame assembly provided in an embodiment of the present invention;

[0049] Figure 13 This is a schematic diagram of the structure of the central cylinder formed by the enclosing of the first and second arc plates according to an embodiment of the present invention;

[0050] Figure 14 This is a partial structural diagram of the unfolded central cylinder provided in an embodiment of the present invention.

[0051] In the picture:

[0052] 1. Mounting bracket assembly; 11. First top plate; 12. Lower end assembly; 13. First outer side plate; 14. First arc plate; 15. Connecting plate; 151. Process hole; 16. First partition; 161. First section; 162. Second section; 17. Second partition;

[0053] 2. Pile fixing frame assembly; 21. Second top plate; 22. Bottom plate; 23. Second outer side plate; 231. Sub-plate; 24. Second arc plate; 25. Third partition plate;

[0054] 3. Rack and pinion slot;

[0055] 4. Pile fixing block slot;

[0056] 5. First guide plate;

[0057] 6. Second guide plate. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0065] like Figures 1-14 As shown, this embodiment provides a method for constructing a cross-shaped lifting foundation segment for a self-elevating platform. The lifting foundation segment includes four mounting frame assemblies 1 and four fixed pile frame assemblies 2. The four mounting frame assemblies 1 and the four fixed pile frame assemblies 2 are alternately connected and enclosed to form a central cylinder.

[0066] The construction method includes the following steps:

[0067] S1, Prefabricated mounting bracket assembly 1;

[0068] S2. Install the prefabricated mounting bracket assembly 1 onto the jig;

[0069] S3. On the jig, install a fixed pile frame assembly 2 between each of the two adjacent mounting frame assemblies 1, and connect each component of the fixed pile frame assembly 2 to the two adjacent mounting frame assemblies 1 in sequence.

[0070] S4. A slot assembly is opened in the inner wall of the central cylinder formed by the mounting frame assembly 1 and the pile fixing frame assembly 2, and a guide assembly is installed.

[0071] In other words, the installation frame assembly 1 is prefabricated first, then the installation frame assembly 1 is installed onto the jig in the form of a component, and then all the components of the pile fixing frame assembly 2 are disassembled on the jig, so that the installation frame assembly 1 and the pile fixing frame assembly 2 are finally assembled to form a cross-shaped lifting foundation segment.

[0072] The construction method of the cross-shaped lifting foundation segment of the self-elevating platform provided in this embodiment, by first prefabricating the installation frame assembly 1 and positioning the upper jig, and then disassembling the pile fixing frame assembly 2 between adjacent installation frame assemblies 1, can accurately control the diameter of the central cylinder formed by the installation frame assembly 1 and the pile fixing frame assembly 2, ensuring the manufacturing accuracy of the central cylinder, thereby ensuring the installation accuracy of the guide assembly on the inner wall of the central cylinder, ensuring the guiding effect of the guide assembly on the pile legs, and avoiding problems such as lateral deviation, lifting jamming and uneven load distribution during the lifting of the pile legs. This is conducive to improving the construction quality and assembly stability of the lifting foundation segment, and enhancing the safety and reliability of the pile leg lifting operation.

[0073] like Figures 3-7 As shown, in some embodiments, the mounting frame assembly 1 is configured as a box structure including a first top plate 11, a lower end assembly 12, a first outer side plate 13, a first arc plate 14, and two connecting plates 15. The first top plate 11 and the lower end assembly 12 are arranged opposite each other in the height direction. The first outer side plate 13 and the first arc plate 14 are both connected between the first top plate 11 and the lower end assembly 12 and are arranged opposite each other in the radial direction along the lifting foundation segment. The first arc plate 14 is part of the inner wall of the central cylinder. The two connecting plates 15 are arranged opposite each other in the circumferential direction along the lifting foundation segment. The two connecting plates 15 are used to connect with the pile fixing frame assembly 2.

[0074] Step S1 specifically includes:

[0075] S11. Using the first top plate 11 as the base surface, weld the first outer side plate 13 and a connecting plate 15 (e.g., ...) to the first top plate 11. Figure 3 That is, the mounting frame assembly 1 is prefabricated using the reverse construction method, with the first top plate 11 as the base surface, and other components are installed on the first top plate 11.

[0076] S12, Weld the lower end component 12 to the first outer side plate 13 and a connecting plate 15 (e.g., Figure 4 );

[0077] S13. Weld the first arc plate 14 to the first top plate 11, a connecting plate 15, and the lower end assembly 12 together (e.g., Figure 6 );

[0078] S14. Install another connecting plate 15, and weld the other connecting plate 15 to the first top plate 11, the first outer side plate 13, the lower end assembly 12, and the first arc plate 14 (e.g., Figure 7 ).

[0079] By using this setup, the mounting bracket assembly 1 is prefabricated using a reverse engineering method, and each component is welded in stages to complete the assembly, which allows for precise control of the overall structural dimensions of the mounting bracket assembly 1.

[0080] like Figures 3-7As shown, in some embodiments, the mounting bracket assembly 1 further includes a first partition 16, which includes a first portion 161 and a second portion 162 connected to each other. The first portion 161 is arranged parallel to and spaced apart from the first outer side plate 13. The second portion 162 is parallel to the connecting plate 15 and extends radially inward relative to the first portion 161 along the lifting base segment. The second portion 162 is used for welding to the first arc plate 14.

[0081] Step S11 further includes: installing a first partition 16 on the first top plate 11, such that both the first portion 161 and the second portion 162 are welded to the first top plate 11 (e.g., Figure 3 ).

[0082] The first partition plate 16 is provided such that its second portion 162 can be welded to the first arc plate 14. This increases the number of connection points for the installation of the first arc plate 14, which helps to improve the structural stability of the first arc plate 14 after assembly.

[0083] Optionally, the first portion 161 of the first partition 16 is welded to the connecting plate 15 installed in step S11; when step S12 is performed, the lower component 12 is also welded to the first partition 16, and when another connecting plate 15 is installed in step S14, the other connecting plate 15 is also welded to the first portion 161. This arrangement enables the first partition 16 to enhance the overall structural strength and rigidity of the mounting frame assembly 1, preventing deformation of the mounting frame assembly 1 during subsequent prefabrication, assembly, and other processes.

[0084] Furthermore, such as Figures 3-8 As shown, in some embodiments, the mounting bracket assembly 1 further includes a second partition 17, which is parallel to the connecting plate 15.

[0085] After step S12, the method further includes: installing the second partition 17, and welding the second partition 17 to the first top plate 11, the first outer side plate 13, the lower end assembly 12, and the first segment 161 (e.g., Figure 5 ).

[0086] With this arrangement, the second partition 17 can further increase the number of internal support points of the mounting bracket assembly 1, which is conducive to further improving the overall structural strength and deformation resistance of the mounting bracket assembly 1.

[0087] Optionally, the second partition 17 is welded to the first top plate 11, the first outer side plate 13, the lower end component 12, and the first section 161 using a single-sided welding method. Specifically, the second partition 17 has a 45° bevel around its perimeter, and all four sides are welded using a single-sided welding method with steel gaskets applied on the reverse side. The single-sided welding method simplifies the construction process and helps improve the prefabrication efficiency of the mounting frame component 1.

[0088] Alternatively, multiple second partitions 17 are spaced apart, and the next one is welded after the previous one is completed. In this embodiment, there are two second partitions 17, but it is not limited to this. In other embodiments, there may be three, four, etc., depending on the actual situation.

[0089] like Figure 7 As shown, in some embodiments, at least one connecting plate 15 has a process hole 151, which is resealed after the mounting bracket assembly 1 is prefabricated. This process hole 151 can be used to perform anti-corrosion pre-coating on the internal cavity of the mounting bracket assembly 1 after prefabrication, improving the comprehensiveness and uniformity of the anti-corrosion treatment; after the pre-coating process is completed, the process hole 151 is resealed to ensure the structural integrity and sealing of the mounting bracket assembly 1.

[0090] When resealing process hole 151, a method of partial padding and single-sided welding is adopted.

[0091] like Figures 10-12 As shown, in some embodiments, the pile fixing frame assembly 2 includes a second top plate 21, a bottom plate 22, a second outer side plate 23, a second arc plate 24, and a third partition plate 25. The second top plate 21 and the bottom plate 22 are arranged opposite each other along the height direction. The second outer side plate 23 and the second arc plate 24 are both connected between the second top plate 21 and the bottom plate 22 and are arranged opposite each other radially along the lifting foundation segment. The second arc plate 24 and the first arc plate 14 together form the inner wall of the central cylinder. The third partition plate 25 is erected between the second top plate 21 and the bottom plate 22.

[0092] Step S3 specifically includes:

[0093] S31. Connect the second top plate 21 between two adjacent mounting bracket assemblies 1. One end of the second top plate 21 is welded to the connecting plate 15 of one of the mounting bracket assemblies 1, and the other end of the second top plate 21 is welded to the connecting plate 15 of another adjacent mounting bracket assemblies 1. The second top plate 21 is flush with the first top plate 11 in the height direction.

[0094] S32. Weld the third partition 25 to the second top plate 21;

[0095] S33. Weld the second arc plate 24 to the second top plate 21 and the third partition plate 25 together.

[0096] S34. Weld the base plate 22 to the third partition plate 25 and the second arc plate 24, and weld the base plate 22 between two adjacent connecting plates 15.

[0097] S35. Install the second outer side plate 23 and weld the second outer side plate 23 to the second top plate 21, bottom plate 22 and third partition plate 25.

[0098] With this setup, the pile fixing frame assembly 2 is assembled between two adjacent mounting frame assemblies 1 using a piecemeal, step-by-step welding method, enabling precise docking between the pile fixing frame assembly 2 and the mounting frame assembly 1. Simultaneously, this step-by-step assembly process precisely controls the forming accuracy and installation position of the second arc plate 24, ensuring a smooth connection between the second arc plate 24 and the first arc plate 14 of the mounting frame assembly 1, together forming a precisely dimensional central cylinder inner wall, guaranteeing the installation accuracy of subsequent guide components. Furthermore, the third partition plate 25 enhances the structural strength and deformation resistance of the pile fixing frame assembly 2, further improving the overall structural stability of the lifting foundation segment and preventing problems such as jamming and uneven load distribution during pile leg lifting.

[0099] like Figures 10-12 As shown, in some embodiments, multiple third partitions 25 are provided, and the second outer side plate 23 includes multiple sub-plates 231, which are welded to the sidewalls of the third partitions 25. That is, the multiple sub-plates 231 are embedded. For example, in this embodiment, four third partitions 25 are provided, and five sub-plates 231 are provided accordingly.

[0100] With this setup, the embedded installation method can increase the welding contact area between the second outer side plate 23 and the third partition plate 25. At the same time, the embedded structure can make the sub-plate 231 and the third partition plate 25 form a mutually constrained force system, which helps to improve the connection strength. In addition, the segmented embedded installation method facilitates the bulk welding operation on the jig, reducing the assembly difficulty.

[0101] Optionally, the sub-plate 231 is welded to the third partition 25, the second top plate 21, and the bottom plate 22 using a single-sided welding method. Specifically, each sub-plate 231 is welded using a single-sided welding method with steel backing attached to all four sides.

[0102] Optionally, the two sub-plates 231 located at both ends can be welded to the connecting plate 15 of the corresponding mounting bracket assembly 1, specifically by single-sided welding.

[0103] like Figure 9 , Figure 13 and Figure 14 As shown, in some embodiments, the slot assembly includes a rack slot 3 and a fixed block slot 4. The rack slot 3 is formed on the first arc plate 14, and the fixed block slot 4 is formed on the second arc plate 24. The guide assembly includes a first guide plate 5 and a second guide plate 6. The first guide plate 5 is welded to the first arc plate 14, and the second guide plate 6 is welded to the second arc plate 24.

[0104] Among them, the rack and pinion slot 3 is used to adapt to the rack and pinion structure on the cylindrical pile leg, realizing meshing guidance and load transfer during the lifting and lowering process of the pile leg. The pile fixing block slot 4 is used to position and install the pile fixing component of the pile leg, enhancing the connection stability between the pile leg and the lifting foundation segment. The first guide plate 5 and the second guide plate 6 can further enhance the limiting and guiding effect on the pile leg, accurately constrain the lifting and lowering trajectory of the pile leg, and avoid problems such as lateral deviation and swaying of the pile leg during the lifting and lowering process.

[0105] This configuration, by opening a rack groove 3 on the first arc plate 14 forming the inner wall of the central cylinder and a pile fixing block groove 4 on the second arc plate 24, and welding the first guide plate 5 and the second guide plate 6 accordingly, forms a guide and limiting system adapted to the pile leg structure, which is beneficial to improving the stability and accuracy of the pile leg lifting action.

[0106] Optionally, the first guide plate 5 is configured as an arc plate that matches the curvature of the first arc plate 14.

[0107] Optionally, the second guide plate 6 is configured as an arc-shaped plate that matches the curvature of the second arc plate 24, and multiple second guide plates 6 may be configured.

[0108] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method of constructing a segment of a spider jacking foundation of a jack-up platform, characterised in that, The lifting foundation section includes four mounting frame assemblies (1) and four pile fixing frame assemblies (2), which are alternately connected and enclose to form a central cylinder; the construction method includes the following steps: S1. Prefabricate the mounting bracket assembly (1); S2. Install the prefabricated mounting bracket assembly (1) onto the jig; S3. On the jig, install a fixed pile frame assembly (2) between each of the two adjacent mounting frame assemblies (1), and connect each component of the fixed pile frame assembly (2) sequentially between the two adjacent mounting frame assemblies (1); S4. A slot assembly is opened on the inner wall of the central cylinder formed by the mounting frame assembly (1) and the fixed pile frame assembly (2), and a guide assembly is installed. The mounting frame assembly (1) is configured as a box structure including a first top plate (11), a lower end assembly (12), a first outer side plate (13), a first arc plate (14) and two connecting plates (15). The first top plate (11) and the lower end assembly (12) are arranged opposite each other in the height direction. The first outer side plate (13) and the first arc plate (14) are both connected between the first top plate (11) and the lower end assembly (12) and are arranged opposite each other in the radial direction of the lifting foundation segment. The first arc plate (14) is part of the inner wall of the central cylinder. The two connecting plates (15) are arranged opposite each other in the circumferential direction of the lifting foundation segment. The two connecting plates (15) are used to connect with the fixed pile frame assembly (2). Step S1 specifically includes: S11. Using the first top plate (11) as the base surface, weld the first outer side plate (13) and a connecting plate (15) to the first top plate (11). S12. Weld the lower end component (12) to the first outer side plate (13) and a connecting plate (15); S13. The first arc plate (14) is welded to the first top plate (11), a connecting plate (15), and the lower end component (12); S14. Install another connecting plate (15) so that the other connecting plate (15) is welded to the first top plate (11), the first outer side plate (13), the lower end assembly (12), and the first arc plate (14); The fixed pile frame assembly (2) includes a second top plate (21), a bottom plate (22), a second outer side plate (23), a second arc plate (24), and a third partition plate (25). The second top plate (21) and the bottom plate (22) are arranged opposite each other in the height direction. The second outer side plate (23) and the second arc plate (24) are both connected between the second top plate (21) and the bottom plate (22) and are arranged opposite each other in the radial direction of the lifting foundation segment. The second arc plate (24) and the first arc plate (14) together form the inner wall of the central cylinder. The third partition plate (25) is erected between the second top plate (21) and the bottom plate (22). Step S3 specifically includes: S31. The second top plate (21) is connected between two adjacent mounting bracket assemblies (1), one end of the second top plate (21) is welded to the connecting plate (15) of one of the mounting bracket assemblies (1), and the other end of the second top plate (21) is welded to the connecting plate (15) of the other adjacent mounting bracket assembly (1); the second top plate (21) is flush with the first top plate (11) in the height direction; S32. Weld the third partition (25) to the second top plate (21); S33. The second arc plate (24) is welded to the second top plate (21) and the third partition plate (25); S34. Weld the base plate (22) to the third partition plate (25) and the second arc plate (24), and weld the base plate (22) between two adjacent connecting plates (15); S35. Install the second outer side plate (23) and weld the second outer side plate (23) to the second top plate (21), the bottom plate (22), and the third partition plate (25).

2. The construction method of the cross-shaped lifting foundation segment of the self-elevating platform according to claim 1, characterized in that, The mounting bracket assembly (1) further includes a first partition (16), which includes a first portion (161) and a second portion (162) connected to each other. The first portion (161) is arranged parallel to and spaced apart from the first outer side plate (13). The second portion (162) is parallel to the connecting plate (15) and extends radially inward relative to the first portion (161) along the lifting base segment. The second portion (162) is used to weld to the first arc plate (14). Step S11 further includes: installing the first partition (16) on the first top plate (11) so that the first part (161) and the second part (162) are both welded to the first top plate (11).

3. The construction method of the cross-shaped lifting foundation segment of the self-elevating platform according to claim 2, characterized in that, The mounting bracket assembly (1) further includes a second partition (17) which is parallel to the connecting plate (15); After step S12, the method further includes: installing the second partition (17) and welding the second partition (17) to the first top plate (11), the first outer side plate (13), the lower end assembly (12) and the first sub-section (161).

4. The construction method of the cross-shaped lifting foundation segment of the self-elevating platform according to claim 3, characterized in that, The second partition (17) is welded to the first top plate (11), the first outer side plate (13), the lower end component (12), and the first sub-section (161) using a single-sided welding method.

5. The construction method of the cross-shaped lifting foundation segment of the self-elevating platform according to claim 3, characterized in that, At least one of the connecting plates (15) has a process hole (151) which is sealed after the mounting bracket assembly (1) is prefabricated.

6. The construction method of the cross-shaped lifting foundation segment of the self-elevating platform according to claim 1, characterized in that, The third partition (25) is provided in multiple ways, and the second outer side plate (23) includes multiple sub-plates (231), which are welded to the side wall of the third partition (25).

7. The construction method of the cross-shaped lifting foundation segment of the self-elevating platform according to claim 6, characterized in that, The sub-plate (231) is welded to the third partition (25), the second top plate (21), and the bottom plate (22) using a single-sided welding method.

8. The construction method of the cross-shaped lifting foundation segment of the self-elevating platform according to claim 1, characterized in that, The slot assembly includes a rack slot (3) and a fixed block slot (4). The rack slot (3) is formed on the first arc plate (14), and the fixed block slot (4) is formed on the second arc plate (24). The guide assembly includes a first guide plate (5) and a second guide plate (6). The first guide plate (5) is welded to the first arc plate (14), and the second guide plate (6) is welded to the second arc plate (24).

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