Segmented construction method for lifting foundation of self-elevating platform

Abstract

The invention discloses a segmented construction method for a lifting foundation of a self-elevating platform, and relates to the technical field of ship engineering. The lifting foundation comprises a plurality of installation frames arranged at intervals in the circumferential direction, first pile fixing frames and second pile fixing frames, the first pile fixing frames and the second pile fixing frames are fixedly connected between the adjacent installation frames, and a lifting hole is defined by the inner side of the lifting foundation. In the prefabricating stage, a plurality of first mounting bodies and first pile fixing frames are alternately tailor-welded in the circumferential direction to form an annular lifting cylinder to shape the roundness, and second mounting bodies and second pile fixing frames are welded to form a supporting frame body; s2, correspondingly arranging a first positioning butt joint part and a second positioning butt joint part on the first mounting body and the second mounting body; and S3, the lifting barrel is hoisted to the in-place supporting frame body on a general assembly site, and the lifting barrel is matched, welded and fixed through the positioning butt joint parts. According to the method, the closed annular lifting cylinder is prefabricated, roundness precision is controlled in a prefabrication stage, the conditions of accumulated tolerance and welding deformation on a final assembly site are avoided, and the construction efficiency is improved.

Description

Technical Field

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

[0002] The self-elevating platform lifting foundation is welded together by multiple mounting frames and multi-layer fixed pile frame components set between adjacent mounting frames. The lifting hole formed by the inner side walls of the mounting frames and the fixed pile frame is the channel that supports and guides the lifting of the cylindrical pile legs. Because the lifting system has extremely high requirements for the fit between the pile legs and the lifting hole, the roundness tolerance of the inner diameter of the lifting hole usually needs to be controlled at the millimeter level.

[0003] Existing construction processes often divide the mounting frame and each layer of the pile fixing frame into multiple independent, loose sections. After each component is prefabricated, they are assembled on-site around the pile leg axis during the final assembly stage in the dock or slipway. This multi-part assembly method means that the roundness control of the lifting hole depends on the alignment accuracy and welding deformation control at the final assembly site. Due to the complex working conditions, gravity deformation, and dense heat input from the welds at the final assembly site, the cumulative tolerances caused by the splicing of multiple components are prone to exceed the standards, making it difficult for the roundness of the central cylinder to meet design requirements. In severe cases, it can even cause the lifting structure to jam. The excessive frequency of loose component hoisting also prolongs the final assembly cycle and increases the pressure on the scheduling of lifting resources. Summary of the Invention

[0004] The purpose of this invention is to provide a segmented construction method for a self-elevating platform lifting foundation. By welding multiple first mounting bodies and multiple first fixed pile frames into a closed annular lifting cylinder during the prefabrication stage, the roundness accuracy of the inner diameter of the lifting hole can be controlled within the prefabrication workshop. This avoids the problem of difficulty in ensuring the roundness of the central cylinder due to accumulated tolerances and welding deformation at the final assembly site. At the same time, by recombining the discrete mounting frames and fixed pile frames into lifting cylinders and support frames, the number of hoisting operations during the final assembly stage is reduced. Under the premise of ensuring the geometric accuracy of the lifting hole, the overall assembly efficiency of the lifting foundation is improved and the construction cycle is shortened.

[0005] To achieve the above objectives, the present invention provides a segmented construction method for a self-elevating platform lifting foundation. The lifting foundation includes multiple mounting frames, which are spaced apart circumferentially. A first fixed pile frame and a second fixed pile frame are fixedly connected between every two adjacent mounting frames. The first fixed pile frame is located above the second fixed pile frame. The inner sidewall of the mounting frame has a first lifting arc surface, and the inner sidewall of the first fixed pile frame has a second lifting arc surface. The multiple first lifting arc surfaces and the multiple second lifting arc surfaces together enclose and define a lifting hole. The construction method includes the following steps: S1, each mounting frame is divided into a first mounting body and a second mounting body in the horizontal direction. At the prefabrication site, the multiple first mounting bodies and the multiple first fixed pile frames are alternately assembled and welded in the circumferential direction to form a lifting cylinder to determine the roundness of the lifting hole. The multiple second mounting bodies and the multiple second fixed pile frames are welded to form a support frame. S2. A first positioning docking part is provided at the bottom of the first mounting body, and a second positioning docking part is provided at the top of the second mounting body; S3. At the final assembly site, the support frame is positioned, the lifting cylinder is hoisted onto the support frame, and the first positioning docking part and the second positioning docking part are docked and welded together to complete the fixing of the first mounting body and the second mounting body.

[0006] Furthermore, the bottom of the first mounting body has a first partition extending in a horizontal direction, the outer end of the first mounting body has a first outer plate, the inner end of the first mounting body has a first inner plate, the first lifting arc surface is disposed on the first inner plate, the first positioning docking part includes a first extension plate, a second extension plate, a first middle plate and two first docking plates, the first extension plate is disposed at the bottom of the first outer plate and the second extension plate is disposed at the bottom of the first inner plate, the first extension plate and the second extension plate extend downward from the first partition by a predetermined distance, the first middle plate extends radially along the lifting hole, the first middle plate is connected to the first partition, the inner and outer ends of the first middle plate are respectively connected to the middle of the first inner plate and the middle of the first outer plate, the two first docking plates are respectively disposed on the two side walls of the first mounting body, and there is a first clearance gap between the first docking plate and the first inner plate or the first outer plate; The second mounting body has a second partition plate extending horizontally at its top, a second outer side plate at its outer end, and a second inner side plate at its inner end. The second positioning docking part includes a third extension plate, a fourth extension plate, a second middle plate, and two second docking plates. The third extension plate is disposed at the top of the second outer side plate, and the fourth extension plate is disposed at the top of the second inner side plate. The third extension plate and the fourth extension plate extend upward. The second middle plate extends radially along the lifting hole. The second middle plate is connected to the second partition plate. The inner and outer ends of the second middle plate are respectively connected to the middle of the second inner side plate and the middle of the second outer side plate. The two second docking plates are respectively disposed on the two side walls of the second mounting body. There is a second clearance gap between the second docking plate and the second inner side plate or the second outer side plate. In the vertical direction, the first extension plate is welded to the third extension plate, the second extension plate is welded to the fourth extension plate, the first middle plate is welded to the second middle plate, and the first butt plate is welded to the second butt plate. The first extension plate, the third extension plate, the second extension plate, the fourth extension plate, the first middle plate, the second middle plate, the first butt plate, and the second butt plate enclose and define two welding operation cavities. The first clearance gap and the second clearance gap together form an operation passage for operators to pass through, and the operation passage is connected to the welding operation cavity. Step S3 includes step S32. In step S32, after the lifting cylinder is hoisted into place, the operators and welding equipment enter the welding operation chamber through the operation opening and sequentially weld the joint between the first middle plate and the second middle plate, the joint between the first extension plate and the third extension plate, the joint between the second extension plate and the fourth extension plate, and the joint between the first butt plate and the second butt plate.

[0007] Furthermore, in each of the welding operation chambers, the second partition is also provided with a third partition and a fourth partition. The third extension plate, the third partition, the fourth partition, and the fourth extension plate are arranged sequentially from the outside to the inside. The two ends of the third partition and the fourth partition in the horizontal direction are respectively connected to the second middle plate and the second butt plate. The lifting base also includes a sealing assembly, which includes a first sealing plate, a second sealing plate, and a third sealing plate. In each welding operation chamber, the fourth partition plate, the first middle plate, the first partition plate, and the first butt plate together define a first gap. The first sealing plate is welded to and seals the first gap. The third partition plate, the first middle plate, the first partition plate, and the first butt plate together define a second gap. The second sealing plate is welded to the second gap. The third sealing plate is welded to and seals the operation opening. Step S3 further includes S33, in which the operator first welds the first sealing plate and seals the first gap located on the inner side. Then, the operator retreats to the outer side through the second gap on the third partition and welds the second sealing plate and seals the second gap. After the first sealing plate and the second sealing plate are welded and inspected and qualified, the operator withdraws from the welding operation chamber through the operation port and welds the third sealing plate and seals the operation port.

[0008] Furthermore, a first through groove is provided on the third partition plate.

[0009] Furthermore, the sealing assembly also includes a fourth sealing plate. A second through groove is provided on the first middle plate, and a third through groove is provided on the second middle plate. The second through groove and the third through groove are arranged opposite to each other. The second through groove and the third through groove together enclose an opening for workers to pass through. The two welding operation cavities are connected through the opening. The fourth sealing plate is used to weld and seal the opening. Step S33 includes step S331, in which, after the first sealing plate and the second sealing plate are welded and inspected and qualified, the operator uses the fourth sealing plate to weld and seal the passage.

[0010] Furthermore, the second pile fixing frame includes two supporting parts. Within the same second pile fixing frame, the two ends of one of the supporting parts are welded to the second mounting body and one end of the other supporting part, respectively. Step S1 includes step S11, in which one of the two different second fixed pile frames is welded to the opposite side walls of the second mounting body to prefabricate a support unit. Step S3 includes step S31, in which multiple prefabricated support units are circumferentially distributed and positioned at the assembly site, and the ends of the support segments on the sides of two adjacent support units are welded together to form a complete second fixed pile frame, thereby assembling a complete support frame body.

[0011] Furthermore, the lifting base also includes multiple connecting plates, and the ends of the supporting parts on the sides of two adjacent supporting units are welded together through the connecting plates; Step S31 includes step S311, in which the connecting plate is installed over the joint of two adjacent support components; the connecting plate is welded to the ends of the two support components, thereby rigidly connecting the adjacent support units into the support frame.

[0012] Compared with existing technologies, the segmented construction method of a self-elevating platform lifting foundation according to this invention has the following advantages: In the prefabrication stage, multiple first mounting bodies and multiple first fixed pile frames are pre-welded into a closed-loop lifting cylinder. This transfers the roundness control of the lifting hole from the complex assembly site to the prefabrication stage with better process conditions, effectively avoiding the cumulative tolerance exceeding the standard caused by the assembly of multiple disparate parts, and ensuring that the inner diameter tolerance of the lifting hole meets the roundness requirements. The discrete mounting frames, first fixed pile frames, and second fixed pile frames are recombined into the lifting cylinder and support frame, reducing the number of components entering the final assembly stage, lowering the hoisting frequency of the lifting equipment, and improving overall construction efficiency. The first positioning docking part located at the bottom of the first mounting body and the second positioning docking part located at the top of the second mounting body enable the lifting cylinder to be quickly positioned with the support frame below during hoisting, further improving construction efficiency. Attached Figure Description

[0013] Figure 1 This is an assembly flowchart of the construction method of the self-elevating platform lifting foundation in the existing technology; Figure 2 This is an assembly flowchart of the segmented construction method for the self-elevating platform lifting foundation in the embodiments of the present invention; Figure 3 This is a schematic diagram of the structure of the first mounting body in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first pile fixing frame in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the lifting cylinder in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the second pile fixing frame in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the support unit in an embodiment of the present invention; Figure 8 This is a flowchart of the segmented construction method of the self-elevating platform lifting foundation in an embodiment of the present invention; In the picture, 1. Mounting bracket; 11. First mounting body; 111. First partition plate; 112. First outer side plate; 113. First inner side plate; 1131. First lifting arc surface; 114. First positioning docking part; 1141. First extension plate; 1142. Second extension plate; 1143. First middle plate; 11431. Second through groove; 1144. First docking plate; 115. First clearance gap; 12. Second mounting body; 121. Second partition plate; 122. Third partition plate; 1221. First through groove; 123. Fourth partition plate; 124. Second outer side plate; 125. Second inner side plate; 126. Second positioning docking part; 1261. Third extension plate; 1262. Fourth extension plate; 1263. Second middle plate; 12631. Third through groove; 1264. Second docking plate; 127. Second clearance gap; 2. First pile fixing frame; 21. Second lifting arc surface; 3. Second pile fixing frame; 31. Support structure; 4. Sealing assembly; 41. First sealing plate; 42. Second sealing plate; 43. Third sealing plate; 5. Connecting plate; 6. Lifting cylinder; 7. Support frame; 8. Support unit; 9. Lifting hole; 10. Welding work chamber; 101. Operation port; 102. Passing through the mouth. Detailed Implementation

[0014] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0015] In the description of this invention, the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "lateral," and "longitudinal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0016] In the description of this invention, the terms "provided with," "set up," "connected," and "placed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0017] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0018] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0019] like Figure 1 , 2 As shown in Figure 8, an embodiment of the present invention provides a segmented construction method for a self-elevating platform lifting foundation. The lifting foundation includes multiple mounting frames 1, which are spaced apart circumferentially. A first fixed pile frame 2 and a second fixed pile frame 3 are fixedly connected between every two adjacent mounting frames 1. The first fixed pile frame 2 is located above the second fixed pile frame 3. The inner sidewall of the mounting frame 1 has a first lifting arc surface 1131, and the inner sidewall of the first fixed pile frame 2 has a second lifting arc surface 21. The multiple first lifting arc surfaces 1131 and the multiple second lifting arc surfaces 21 together enclose and define a lifting hole 9. The construction method includes the following steps: S1. Each mounting frame 1 is divided into a first mounting body 11 and a second mounting body 12 in the horizontal direction. At the prefabrication site, multiple first mounting bodies 11 and multiple first fixed pile frames 2 are alternately assembled and welded in the circumferential direction to form a lifting cylinder 6 to determine the roundness of the lifting hole 9. Multiple second mounting bodies 12 and multiple second fixed pile frames 3 are welded to form a support frame 7. S2. A first positioning docking part 114 is provided at the bottom of the first mounting body 11, and a second positioning docking part 126 is provided at the top of the second mounting body 12. S3. At the final assembly site, position the support frame 7, hoist the lifting cylinder 6 onto the support frame 7, and connect the first positioning docking part 114 and the second positioning docking part 126 and weld them together to complete the fixing of the first mounting body 11 and the second mounting body 12.

[0020] Based on the above technical solution, in the prefabrication stage, multiple first mounting bodies 11 and multiple first fixed pile frames 2 are pre-welded into a closed-loop lifting cylinder 6. The roundness control of the lifting hole 9 is transferred from the complex final assembly site to the prefabrication stage with better process conditions, effectively avoiding the cumulative tolerance exceeding the standard caused by the assembly of multiple disparate parts, and ensuring that the inner diameter tolerance of the lifting hole 9 meets the roundness requirements. The discrete mounting frame 1, first fixed pile frame 2, and second fixed pile frame 3 are recombined into the lifting cylinder 6 and support frame 7, reducing the number of parts entering the final assembly stage, reducing the hoisting frequency of the lifting equipment, and improving the overall construction efficiency. The first positioning docking part 114 set at the bottom of the first mounting body 11 and the second positioning docking part 126 set at the top of the second mounting body 12 enable the lifting cylinder 6 to be quickly positioned with the support frame 7 below when it is hoisted and placed, improving construction efficiency.

[0021] Specifically, in S3, an adjustment frame is pre-set at the assembly site. The support frame 7 is positioned using the adjustment frame to determine its spatial reference. The lifting cylinder 6 is hoisted onto the adjustment frame, and its attitude is adjusted using the adjustment frame. The vertical height and circumferential deflection angle of the lifting cylinder 6 relative to the support frame 7 are adjusted to ensure precise alignment between the first positioning docking part 114 and the second positioning docking part 126. After the lifting cylinder 6 and the support frame 7 are aligned, the first positioning docking part 114 and the second positioning docking part 126 are welded and fixed.

[0022] An adjustment frame is introduced at the assembly site. The adjustment frame establishes a spatial reference for the support frame 7, and the lifting cylinder 6 is supported on the adjustment frame. This transforms the dynamic hoisting and closing into a posture adjustment based on a mechanical reference. By utilizing the adjustment frame's function of adjusting the vertical height and circumferential deflection angle, random deviations during the hoisting process can be eliminated, ensuring the precise docking of the first positioning docking part 114 and the second positioning docking part 126. This solves the problem of inaccurate alignment that easily occurs during closing. After the lifting cylinder 6 is hoisted to the adjustment frame, its posture is relatively stable, freeing the closing operation from the dependence on long-term suspension and support of large lifting equipment. This releases lifting resources and effectively reduces the safety risks brought by high-altitude heavy-load suspension operations, providing a more stable construction environment for the welding and fixing operations of the first positioning docking part 114 and the second positioning docking part 126.

[0023] Preferably, such as Figure 3 , 4As shown in Figures 5 and 7, the bottom of the first mounting body 11 has a first partition plate 111 extending horizontally, the outer end of the first mounting body 11 has a first outer side plate 112, the inner end of the first mounting body 11 has a first inner side plate 113, the first lifting arc surface 1131 is disposed on the first inner side plate 113, and the first positioning docking part 114 includes a first extension plate 1141, a second extension plate 1142, a first middle plate 1143, and two first docking plates 1144. The first extension plate 1141 is disposed at the bottom of the first outer side plate 112, and the second extension plate 1142 is disposed at the bottom of the first inner side plate 113. At the bottom of the side plate 113, the first extension plate 1141 and the second extension plate 1142 extend downward from the first partition plate 111 by a predetermined distance. The first middle plate 1143 extends radially along the lifting hole 9. The first middle plate 1143 is connected to the first partition plate 111. The inner and outer ends of the first middle plate 1143 are respectively connected to the middle of the first inner side plate 113 and the middle of the first outer side plate 112. The two first mating plates 1144 are respectively disposed on the two side walls of the first mounting body 11. The first mating plate 1144 and the first inner side plate 113 or the first outer side plate 112 have a first clearance gap 115. The second mounting body 12 has a second partition 121 extending horizontally at its top, a second outer side plate 124 at its outer end, and a second inner side plate 125 at its inner end. The second positioning and docking part 126 includes a third extension plate 1261, a fourth extension plate 1262, a second middle plate 1263, and two second docking plates 1264. The third extension plate 1261 is disposed on the top of the second outer side plate 124, and the fourth extension plate 1262 is disposed on the top of the second inner side plate 125. The third extension plate 1261 and the fourth extension plate 1262 extend upwards, the second middle plate 1263 extends radially along the lifting hole 9, the second middle plate 1263 is connected to the second partition plate 121, the inner and outer ends of the second middle plate 1263 are respectively connected to the middle of the second inner side plate 125 and the middle of the second outer side plate 124, and the two second mating plates 1264 are respectively disposed on the two side walls of the second mounting body 12, and the second mating plate 1264 has a second clearance gap 127 between it and the second inner side plate 125 or the second outer side plate 124. In the vertical direction, the first extension plate 1141 is welded to the third extension plate 1261, the second extension plate 1142 is welded to the fourth extension plate 1262, the first middle plate 1143 is welded to the second middle plate 1263, and the first butt plate 1144 is welded to the second butt plate 1264. The first extension plate 1141, the third extension plate 1261, the second extension plate 1142, the fourth extension plate 1262, the first middle plate 1143, the second middle plate 1263, the first butt plate 1144, and the second butt plate 1264 enclose and define two welding operation cavities 10. The first clearance gap 115 and the second clearance gap 127 together form an operation passage 101 for workers to pass through. The operation passage 101 is connected to the welding operation cavity 10. Step S3 includes step S32. In step S32, after the lifting cylinder 6 is hoisted into place, the operators and welding equipment enter the welding operation chamber 10 through the operation port 101 and weld the joints of the first middle plate 1143 and the second middle plate 1263, the joints of the first extension plate 1141 and the third extension plate 1261, the joints of the second extension plate 1142 and the fourth extension plate 1262, and the joints of the first butt plate 1144 and the second butt plate 1264 in sequence.

[0024] The radial welding of the first middle plate 1143 and the second middle plate 1263, and the vertical welding of the first extension plate 1141 and the third extension plate 1261, and the second extension plate 1142 and the fourth extension plate 1262, ensure that the main load-bearing components between the first inner plate 113 and the second inner plate 125, and the first outer plate 112 and the second outer plate 124 are precisely connected from top to bottom at the closing point. This ensures that the closing part of the lifting cylinder 6 and the support frame 7 has sufficient structural strength when bearing load, effectively avoiding stress concentration. The welding sequence defined in step S32 prioritizes welding the joint between the first middle plate 1143 and the second middle plate 1263 located in the center, and then advances the welding to the outer extension plates and the connecting plates. Welding stress is released from the inside to the outside on the same mounting frame 1, reducing the influence of welding deformation on the position and posture of the first inner plate 113. This prevents the first lifting arc surface 1131 from shifting and warping during the closing process, ensuring the overall inner diameter roundness accuracy of the lifting hole 9.

[0025] More preferably, such as Figure 5 As shown, in each welding operation chamber 10, the second partition 121 is also provided with a third partition 122 and a fourth partition 123. The third extension plate 1261, the third partition 122, the fourth partition 123 and the fourth extension plate 1262 are arranged in sequence from the outside to the inside. The two ends of the third partition 122 and the fourth partition 123 in the horizontal direction are connected to the second middle plate 1263 and the second butt plate 1264, respectively. The lifting foundation also includes a sealing component 4, which includes a first sealing plate 41, a second sealing plate 42, and a third sealing plate 43. In each welding operation chamber 10, a fourth partition plate 123, a first middle plate 1143, a first partition plate 111, and a first butt plate 1144 together define a first gap. The first sealing plate 41 is welded to and seals the first gap. The third partition plate 122, the first middle plate 1143, the first partition plate 111, and the first butt plate 1144 together define a second gap. The second sealing plate 42 is welded to the second gap. The third sealing plate 43 is welded to and seals the operation opening 101. Step S3 also includes S33, in which the operator first welds the first sealing plate 41 and seals the first gap located on the inner side. Then, the operator retreats to the outer side through the second gap on the third partition 122 and welds the second sealing plate 42 and seals the second gap. After the first sealing plate 41 and the second sealing plate 42 are welded and inspected and qualified, the operator withdraws from the welding operation chamber 10 through the operation opening 101 and welds the third sealing plate 43 and seals the operation opening 101.

[0026] Based on the above technical solution, at the top of the second mounting body 12, the welding operation cavity 10 is further subdivided into multiple small spaces distributed horizontally by the pre-set third partition 122 and fourth partition 123. The fourth partition 123 is located on the inner side, that is, on the side close to the central axis of the mounting frame 1, and the third partition 122 is located on the outer side. After the middle plate, extension plate, and butt plate of the first mounting body 11 and the second mounting body 12 are connected, the workers first enter the welding operation chamber 10 and use the first sealing plate 41 to weld and seal the first gap, forming the first longitudinal barrier inside the mounting frame 1. The workers then retreat outward through the unsealed second gap to the area between the third partition plate 122 and the operation opening 101. The workers then use the second sealing plate 42 to seal and weld the second gap, forming the second longitudinal barrier inside the mounting frame 1. After the first sealing plate 41 and the second sealing plate 42 inside are welded and inspected, the workers completely withdraw from the welding operation chamber 10 and return to the outside of the mounting frame 1 through the operation opening 101. Finally, the third sealing plate 43 is used to seal the operation opening 101, completing the restoration of the outer skin of the entire closure section.

[0027] The addition of the first sealing plate 41 and the second sealing plate 42 actually increases the longitudinal structural continuity in the closing section. By sealing the first gap and the second gap, a multi-web box structure is formed inside the mounting frame 1, which can effectively disperse the load transmitted from the pile legs to the mounting frame 1 and improve the fatigue life of the entire lifting foundation. Multiple independent sealed spaces are formed inside the mounting frame 1. Even if the outer third sealing plate 43 is damaged during long-term use, the inner first sealing plate 41 and the second sealing plate 42 can still play a supporting role, ensuring the long-term stability of the main structure of the mounting frame 1.

[0028] More preferably, such as Figure 7 As shown, a first through groove 1221 is provided on the third partition 122.

[0029] The first sealing plate 41, as a steel structure reinforcement, has considerable weight and size. However, the internal space of the mounting frame 1's closing area is limited. Therefore, a first passageway 1221 is opened on the third partition 122. When the operator holds the first sealing plate 41 and enters the space between the third partition 122 and the fourth partition 123, there is no need to lift the first sealing plate 41 in the height direction to cross the second gap. This lowers the center of gravity of the handling, avoids collisions caused by lifting from a high position, and improves the material transfer efficiency of the closing section.

[0030] It should be noted that the first through groove 1221 is part of the second gap, and the first through groove 1221 can be blocked at the same time when the second sealing plate 42 blocks the distribution of the second gap.

[0031] More preferably, such as Figure 5 , 7 As shown, the sealing assembly 4 also includes a fourth sealing plate. A second through groove 11431 is provided on the first middle plate 1143, and a third through groove 12631 is provided on the second middle plate 1263. The second through groove 11431 and the third through groove 12631 are arranged opposite to each other. The second through groove 11431 and the third through groove 12631 together enclose and form an opening 102 for workers to pass through. The two welding operation cavities 10 are connected through the opening 102. The fourth sealing plate is used to weld and seal the opening 102. Step S33 includes step S331. In step S331, after the first sealing plate 41 and the second sealing plate 42 are welded and inspected and qualified, the operator uses the fourth sealing plate to weld and seal the opening 102.

[0032] Since the first intermediate plate 1143 and the second intermediate plate 1263 are arranged radially, the internal space of the closure area is divided into two independent welding operation chambers 10. The establishment of the passage 102 provides an internal movement channel for operators between the two welding operation chambers 10, so that construction personnel do not need to frequently enter and exit through the external operation passage 101, thus improving the overall assembly efficiency of the internal structure of the closure section of the mounting frame 1. The existence of the passage 102 is not only a personnel passage, but also improves the air circulation conditions in the welding operation chamber 10. When performing steps S31 and S32, this passage is beneficial to The diffusion and discharge of welding fumes improve the working environment under harsh conditions. The first middle plate 1143 and the second middle plate 1263 serve as the radial web plates of the mounting frame 1. Although the second through groove 11431 and the third through groove 12631 are opened for construction convenience, after the internal welding inspection is qualified in step S331, the fourth sealing plate is used to backfill the through groove 102, so that the metal continuity of the first middle plate 1143 and the second middle plate 1263 is restored at the opening, eliminating the stress concentration hidden danger caused by the process opening, and ensuring the shear and bending stiffness of the mounting frame 1.

[0033] Preferably, such as Figure 6 , 7 As shown, the second pile fixing frame 3 includes two supporting parts 31. Within the same second pile fixing frame 3, the two ends of one supporting part 31 are welded to the second mounting body 12 and one end of the other supporting part 31, respectively. Step S1 includes step S11, in which a support component 31 of one of the two different second fixed pile frames 3 is welded to the opposite side walls of the second mounting body 12 to prefabricate a support unit 8. Step S3 includes step S31, in which multiple prefabricated support units 8 are circumferentially distributed and positioned at the assembly site, and the ends of the support segments 31 on the sides of two adjacent support units 8 are welded together to form a complete second fixed pile frame 3, thereby assembling a complete support frame 7.

[0034] The second fixed pile frame 3 is divided into two supporting parts 31. During the prefabrication stage, the two supporting parts 31 belonging to different second fixed pile frames 3 are pre-symmetrically welded to both sides of the second mounting body 12 to form supporting units 8. When the final assembly is completed, only the distribution and posture of a limited number of supporting units 8 in the circumferential direction need to be controlled to achieve rapid alignment of the overall structure, reducing the time required for adjusting spatial geometric tolerances on site. The supporting units 8 are welded in the prefabrication process, which can make full use of the standardized benchmarks and controlled welding environment in the workshop. Compared with the variable working conditions on the final assembly site, the prefabrication stage can more strictly control the connection angle and deviation between the supporting parts 31 and the second mounting body 12, reducing the cumulative tolerance caused by large-span welding on site, and ensuring that the supporting frame body 7 formed by the splicing of multiple supporting units 8 has excellent dimensional consistency.

[0035] More preferably, such as Figure 7 As shown, the lifting base also includes multiple connecting plates 5, and the ends of the support segments 31 on the sides of two adjacent support units 8 are welded together through the connecting plates 5. Step S31 includes step S311, in which the connecting plate 5 is covered and installed on the joint of two adjacent support components 31; the connecting plate 5 is welded to the ends of the two support components 31, thereby rigidly connecting the adjacent support units 8 into a support frame 7.

[0036] At the assembly site, by covering and welding the connecting plate 5 onto the end joints of the support segments 31 of the two adjacent support units 8, the joint is reinforced, effectively compensating for the assembly tolerances at the assembly site of large steel structures. During the assembly of large marine engineering structures, due to changes in ambient temperature and the deflection of the component's own weight, the ends of the support segments 31 on the sides of the two adjacent support units 8 often cannot achieve ideal docking. As a bridging component, the connecting plate 5 can adapt to changes in size on site, reducing the processing accuracy and on-site alignment accuracy of the end of the supporting component 31. This ensures the reliability of the connection even with assembly deviations. Furthermore, it optimizes the stress distribution of the closure weld and enhances fatigue resistance. If only end butt welding is used, the weld will directly bear most of the tensile and shear stress, which is prone to stress concentration. After introducing the connecting plate 5, a portion of the load is diverted and transferred through the weld between the connecting plate 5 and the supporting component 31, effectively changing the stress flow direction at the joint, reducing the stress peak value of the butt weld between the supporting components 31, improving the fatigue life of the closure part during long-term use, and preventing the risk of joint cracking due to vibration under harsh sea conditions.

[0037] In summary, this invention provides a segmented construction method for a self-elevating platform lifting foundation. During the prefabrication stage, multiple first mounting bodies 11 and multiple first fixed pile frames 2 are welded together to form a closed-loop lifting cylinder 6. This transfers the roundness control of the lifting hole 9 from the complex assembly site to the prefabrication stage with its superior process conditions, effectively avoiding cumulative tolerance exceeding the standard caused by assembling multiple disassembled parts and ensuring that the inner diameter tolerance of the lifting hole 9 meets the roundness requirements. The discrete mounting frames 1, first fixed pile frames 2, and second fixed pile frames 3 are recombined into the lifting cylinder 6 and support frame 7, reducing the number of components entering the final assembly stage, lowering the hoisting frequency of the lifting equipment, and improving overall construction efficiency. The first positioning docking part 114 located at the bottom of the first mounting body 11 and the second positioning docking part 126 located at the top of the second mounting body 12 enable the lifting cylinder 6 to be quickly positioned with the support frame 7 below during hoisting, further improving construction efficiency.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A segmented construction method for a self-elevating platform lifting foundation, the lifting foundation comprising multiple mounting frames (1), the multiple mounting frames (1) being spaced apart circumferentially, a first fixed pile frame (2) and a second fixed pile frame (3) being fixedly connected between every two adjacent mounting frames (1), the first fixed pile frame (2) being located above the second fixed pile frame (3), the inner sidewall of the mounting frame (1) having a first lifting arc surface (1131), the inner sidewall of the first fixed pile frame (2) having a second lifting arc surface (21), the multiple first lifting arc surfaces (1131) and the multiple second lifting arc surfaces (21) jointly enclosing and defining a lifting hole (9), characterized in that, The construction method includes the following steps: S1. Each mounting frame (1) is divided into a first mounting body (11) and a second mounting body (12) in the horizontal direction. At the prefabrication site, multiple first mounting bodies (11) and multiple first fixed pile frames (2) are alternately assembled and welded in the circumferential direction to form a lifting cylinder (6) to determine the roundness of the lifting hole (9). Multiple second mounting bodies (12) and multiple second fixed pile frames (3) are welded to form a support frame (7). S2. A first positioning docking part (114) is provided at the bottom of the first mounting body (11), and a second positioning docking part (126) is provided at the top of the second mounting body (12). S3. At the final assembly site, the support frame (7) is positioned, the lifting cylinder (6) is hoisted onto the support frame (7), and the first positioning docking part (114) and the second positioning docking part (126) are docked and welded to fix them, so as to complete the fixation of the first mounting body (11) and the second mounting body (12).

2. The segmented construction method for the lifting foundation of the self-elevating platform according to claim 1, characterized in that, The first mounting body (11) has a first partition plate (111) extending horizontally at its bottom, a first outer side plate (112) at its outer end, and a first inner side plate (113) at its inner end. The first lifting arc surface (1131) is disposed on the first inner side plate (113). The first positioning docking part (114) includes a first extension plate (1141), a second extension plate (1142), a first middle plate (1143), and two first docking plates (1144). The first extension plate (1141) is disposed at the bottom of the first outer side plate (112), and the second extension plate (1142) is disposed at the bottom of the first inner side plate (113). The first extension plate (1141) and the second extension plate (1142) extend downward from the first partition plate (111) by a predetermined distance. The first middle plate (1143) extends radially along the lifting hole (9). The first middle plate (1143) is connected to the first partition plate (111). The inner and outer ends of the first middle plate (1143) are respectively connected to the middle of the first inner side plate (113) and the middle of the first outer side plate (112). The two first docking plates (1144) are respectively disposed on the two side walls of the first mounting body (11). The first docking plate (1144) has a first clearance gap (115) between it and the first inner side plate (113) or the first outer side plate (112). The second mounting body (12) has a second partition plate (121) extending horizontally at its top, a second outer side plate (124) at its outer end, and a second inner side plate (125) at its inner end. The second positioning docking part (126) includes a third extension plate (1261), a fourth extension plate (1262), a second middle plate (1263), and two second docking plates (1264). The third extension plate (1261) is disposed on the top of the second outer side plate (124), and the fourth extension plate (1262) is disposed on the top of the second inner side plate (125). (1261) The fourth extension plate (1262) extends upward, the second middle plate (1263) extends radially along the lifting hole (9), the second middle plate (1263) is connected to the second partition plate (121), the inner and outer ends of the second middle plate (1263) are respectively connected to the middle of the second inner side plate (125) and the middle of the second outer side plate (124), the two second docking plates (1264) are respectively disposed on the two side walls of the second mounting body (12), and the second docking plate (1264) has a second clearance gap (127) with the second inner side plate (125) or the second outer side plate (124). In the vertical direction, the first extension plate (1141) is welded to the third extension plate (1261), the second extension plate (1142) is welded to the fourth extension plate (1262), the first middle plate (1143) is welded to the second middle plate (1263), and the first butt plate (1144) is welded to the second butt plate (1264). The first extension plate (1141), the third extension plate (1261), the second extension plate (1142), the fourth extension plate (1262), the first middle plate (1143), the second middle plate (1263), the first butt plate (1144), and the second butt plate (1264) enclose and define two welding operation cavities (10). The first clearance gap (115) and the second clearance gap (127) together form an operation passage (101) for operators to pass through. The operation passage (101) is connected to the welding operation cavity (10). Step S3 includes step S32. In step S32, after the lifting cylinder (6) is hoisted into place, the operators and welding equipment enter the welding operation chamber (10) through the operation port (101) and weld the joints of the first middle plate (1143) and the second middle plate (1263), the joints of the first extension plate (1141) and the third extension plate (1261), the joints of the second extension plate (1142) and the fourth extension plate (1262), and the joints of the first butt plate (1144) and the second butt plate (1264).

3. The segmented construction method for the lifting foundation of the self-elevating platform according to claim 2, characterized in that, In each of the welding operation chambers (10), the second partition plate (121) is further provided with a third partition plate (122) and a fourth partition plate (123). The third extension plate (1261), the third partition plate (122), the fourth partition plate (123), and the fourth extension plate (1262) are arranged in sequence from the outside to the inside. The third partition plate (122) and the fourth partition plate (123) are connected to the second middle plate (1263) and the second butt plate (1264) at their two ends in the horizontal direction, respectively. The lifting base also includes a sealing assembly (4), which includes a first sealing plate (41), a second sealing plate (42), and a third sealing plate (43). In each of the welding operation chambers (10), the fourth partition plate (123), the first middle plate (1143), the first partition plate (111), and the first docking plate (1144) together define a first gap. The first sealing plate (41) is welded to and seals the first gap. The third partition plate (122), the first middle plate (1143), the first partition plate (111), and the first docking plate (1144) together define a second gap. The second sealing plate (42) is welded to the second gap. The third sealing plate (43) is welded to and seals the operation port (101). Step S3 further includes S33, in which the operator first welds the first sealing plate (41) and seals the first gap located on the inner side. Then, the operator retreats to the outer side through the second gap on the third partition plate (122) and welds the second sealing plate (42) and seals the second gap. After the first sealing plate (41) and the second sealing plate (42) are welded and inspected and qualified, the operator withdraws from the welding operation chamber (10) through the operation port (101) and welds the third sealing plate (43) and seals the operation port (101).

4. The segmented construction method for the lifting foundation of the self-elevating platform according to claim 3, characterized in that, The third partition (122) has a first through groove (1221).

5. The segmented construction method for the lifting foundation of the self-elevating platform according to claim 3, characterized in that, The sealing assembly (4) further includes a fourth sealing plate. A second through groove (11431) is provided on the first middle plate (1143), and a third through groove (12631) is provided on the second middle plate (1263). The second through groove (11431) and the third through groove (12631) are arranged opposite to each other. The second through groove (11431) and the third through groove (12631) together enclose to form an opening (102) for workers to pass through. The two welding operation cavities (10) are connected through the opening (102). The fourth sealing plate is used to weld and seal the opening (102). Step S33 includes step S331, in which, after the first sealing plate (41) and the second sealing plate (42) are welded and inspected and qualified, the operator uses the fourth sealing plate to weld and seal the passage (102).

6. The segmented construction method for the lifting foundation of the self-elevating platform according to claim 1, characterized in that, The second pile fixing frame (3) includes two supporting parts (31). Within the same second pile fixing frame (3), the two ends of one of the supporting parts (31) are welded to the second mounting body (12) and one end of the other supporting part (31), respectively. Step S1 includes step S11, in which one of the two different second fixed pile frames (3) is welded to the opposite side walls of the second mounting body (12) to prefabricate a support unit (8). Step S3 includes step S31, in which multiple prefabricated support units (8) are circumferentially distributed and positioned at the assembly site, and the ends of the support sub-body (31) on the side of two adjacent support units (8) are welded together to form a complete second fixed pile frame (3), thereby assembling a complete support frame body (7).

7. The segmented construction method for the lifting foundation of the self-elevating platform according to claim 6, characterized in that, The lifting base also includes multiple connecting plates (5), and the ends of the supporting parts (31) on the sides of two adjacent supporting units (8) are welded together through the connecting plates (5). Step S31 includes step S311, in which the connecting plate (5) is covered and installed on the joint of two adjacent support components (31); the connecting plate (5) is welded to the ends of the two support components (31), thereby rigidly connecting the adjacent support units (8) into the support frame (7).

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