Method of designing a jack-up offshore platform

Abstract

This application discloses a design method for a self-elevating offshore platform, comprising: inserting a lifting support device into the seabed and installing a deck onto the lifting support device; fabricating a three-dimensional concave reinforced structure base using a negative Poisson's ratio concave cell structure; installing the three-dimensional concave reinforced structure base at a predetermined position on the deck; and installing power equipment on the three-dimensional concave reinforced structure base. The negative Poisson's ratio concave cell structure includes: a concave hexagonal structure, comprising: a first horizontal cell wall, a second horizontal cell wall, a first concave bending structure, and a second concave bending structure; a first rhombus structure and a second rhombus structure, each composed of four inclined cell walls; the connection point of the bottom inclined cell wall of the first rhombus structure is connected to the connection point of the top inclined cell wall of the second rhombus structure; a double rhombus structure is embedded within the concave hexagonal structure, and the top endpoint of the double rhombus structure is connected to the first horizontal cell wall, and the bottom endpoint of the double rhombus structure is connected to the second horizontal cell wall.

Description

Technical Field

[0001] This application relates to the field of marine platform technology, and for example to a design method for a jack-up marine platform. Background Technology

[0002] Offshore platforms are structures that provide production and living facilities for activities such as drilling, oil production, cargo collection, observation, navigation, and construction at sea. The foundation, as a key structure connecting the power equipment to the platform deck, is mostly constructed of welded steel, and its main function is to support and secure the power equipment. Conventional rigid foundations have poor vibration isolation and absorption performance, failing to meet the vibration isolation requirements of offshore platform power equipment. Therefore, it is necessary to optimize and improve the structural form of the offshore platform power equipment foundation.

[0003] The related technology discloses a negative Poisson's ratio cell and a honeycomb structure. The negative Poisson's ratio cell includes six sides, of which the left and right sides are arc sides and the top and bottom sides are long sides. There are two inner vertical rods inside the cell, which are connected to the arc sides on the left and right sides respectively. The cell structure is symmetrically distributed in the top, bottom and left and right. The arc sides are concave into the cell, and the intersection of the arc sides and the long sides forms four arc angles.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] When subjected to stress, the embedded inner vertical rods not only make the structure prone to instability, but also weaken the negative Poisson's ratio effect of the structure, thus failing to guarantee the safe operation of power equipment and marine facilities.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a design method for a self-elevating marine platform to ensure the safe operation of the power equipment and the marine platform.

[0009] In some embodiments, the design method of the self-elevating offshore platform includes: inserting a lifting support device into the seabed and installing a deck onto the lifting support device; fabricating a three-dimensional concave reinforced structure base using a negative Poisson's ratio concave cell structure; installing the three-dimensional concave reinforced structure base at a predetermined position on the deck; and installing power equipment on the three-dimensional concave reinforced structure base; wherein the negative Poisson's ratio concave cell structure includes: a concave hexagonal structure, comprising: a first horizontal cell wall, a second horizontal cell wall, a first concave bending structure, and a second concave bending structure; a first rhombus structure and a second rhombus structure, each composed of four inclined cell walls; the connection point of the bottom inclined cell wall of the first rhombus structure is connected to the connection point of the top inclined cell wall of the second rhombus structure to form a double rhombus structure; the double rhombus structure is embedded within the concave hexagonal structure, and the top endpoint of the double rhombus structure is connected to the first horizontal cell wall, and the bottom endpoint of the double rhombus structure is connected to the second horizontal cell wall.

[0010] In some embodiments, the top endpoint of the double rhombus structure is connected to the midpoint of the first horizontal cell wall, and the bottom endpoint of the double rhombus structure is connected to the midpoint of the second horizontal cell wall, so that the negative Poisson's ratio concave cell structure forms a closed structure that is symmetrical in both the horizontal and vertical directions and concave on both sides.

[0011] In some embodiments, the concave hexagonal structure includes: a first concave bending structure formed by connecting a first inclined cell wall and a second inclined cell wall; and a second concave bending structure formed by connecting a third inclined cell wall and a fourth inclined cell wall; wherein the first inclined cell wall and the third inclined cell wall are laterally opposite each other, and the second inclined cell wall and the fourth inclined cell wall are laterally opposite each other.

[0012] In some embodiments, the centroid of the first rhomboid structure is located on the same horizontal axis as the midpoint of the first inclined cell wall and the third inclined cell wall; the centroid of the second rhomboid structure is located on the same horizontal axis as the midpoint of the second inclined cell wall and the fourth inclined cell wall.

[0013] In some embodiments, the connection point between the first rhombic structure and the second rhombic structure is located on the same vertical axis as the midpoint of the first horizontal cell wall and the midpoint of the second horizontal cell wall, and is located on the same horizontal axis as the connection point between the first inclined cell wall and the second inclined cell wall, and the connection point between the third inclined cell wall and the fourth inclined cell wall.

[0014] In some embodiments, the wall thickness of the concave hexagonal structure is greater than the wall thickness of the double rhombus structure.

[0015] In some embodiments, the inclined cell walls of the concave hexagonal structure and the first horizontal cell wall or the second horizontal cell wall connected thereto form a first predetermined angle. The first preset angle is set to satisfy: 0° < <90°; and / or, each inclined cell wall of the double rhomboid structure forms a second preset angle with the vertical axis containing the midpoint of the first horizontal cell wall and with the vertical axis containing the midpoint of the second horizontal cell wall. Angle setting, the second preset angle satisfies: 0° < < 90°.

[0016] In some embodiments, the lengths of the first horizontal cell wall and the second horizontal cell wall Same; the length of each inclined cell wall of the concave hexagonal structure Same; the length of each inclined cell wall of the rhomboid structure same.

[0017] In some embodiments, ; and / or, , .

[0018] In some embodiments, the fabrication of a three-dimensional concave reinforced structure base using a negative Poisson's ratio concave cell structure includes: periodically arranging and combining the negative Poisson's ratio concave cell structure in a plane to form a two-dimensional concave reinforced honeycomb structure; laterally stretching the two-dimensional concave reinforced honeycomb structure to form a three-dimensional concave reinforced honeycomb structure; orthogonally arranging the three-dimensional concave reinforced honeycomb structure in an array to form a three-dimensional concave reinforced structure base; and providing a top plate on the top of the three-dimensional concave reinforced structure base.

[0019] The design method for a self-elevating marine platform provided in this disclosure can achieve the following technical effects:

[0020] A three-dimensional concave reinforced structural base is fabricated using a negative Poisson's ratio concave cell structure. This negative Poisson's ratio structure is a concave hexagonal structure with embedded double rhombus structures. The double rhombus structures provide additional support during the deformation of the concave hexagonal structure without affecting its deformation. This significantly improves the overall stiffness, load-bearing capacity, and energy absorption characteristics of the structure without compromising its negative Poisson's ratio. Therefore, when designing a jack-up offshore platform, installing this three-dimensional concave reinforced structural base between the deck and the power equipment can improve vibration isolation, shock resistance, and energy absorption for the power equipment, ensuring the safe operation of both the power equipment and the offshore platform.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the design method for a self-elevating marine platform provided in the embodiments of this disclosure;

[0024] Figure 2 This is a schematic diagram of the power equipment provided in this embodiment of the present disclosure being installed on the deck via a three-dimensional concave reinforced structure base;

[0025] Figure 3 This is a schematic diagram of the negative Poisson's ratio concave cell structure provided in the embodiments of this disclosure;

[0026] Figure 4 This is a schematic diagram of the concave hexagonal structure provided in the embodiments of this disclosure;

[0027] Figure 5 This is a schematic diagram of the double rhombus structure provided in the embodiments of this disclosure;

[0028] Figure 6 This is a schematic diagram of the dimensions of the negative Poisson's ratio concave cell structure provided in the embodiments of this disclosure;

[0029] Figure 7 This is a schematic diagram of a three-dimensional concave reinforced structure base fabricated using a negative Poisson's ratio concave cell structure, provided in an embodiment of this disclosure.

[0030] Figure 8 This is a schematic diagram of a two-dimensional concave reinforced honeycomb structure provided in an embodiment of this disclosure;

[0031] Figure 9 This is a schematic diagram of a three-dimensional concave reinforced honeycomb structure provided in an embodiment of this disclosure;

[0032] Figure 10 This is a schematic diagram of the structure of the three-dimensional concave reinforced structure base provided in the embodiments of this disclosure;

[0033] Figure 11 This is a schematic diagram showing the deformation of the concave hexagonal structure provided in this embodiment under compression;

[0034] Figure 12 This is a schematic diagram showing the further deformation of the concave hexagonal structure provided in this embodiment under compression;

[0035] Figure 13 This is a schematic diagram of how a traditional concave hexagonal structure deforms under compression;

[0036] Figure 14 This is a schematic diagram illustrating the further deformation of a traditional concave hexagonal structure when compressed;

[0037] Figure 15 This is a schematic diagram comparing the stress-strain curves of the negative Poisson's ratio concave honeycomb structure provided in this embodiment with those of the traditional concave hexagonal honeycomb structure during compression deformation.

[0038] Figure 16 This is a schematic diagram comparing the specific energy absorption-strain curves of the negative Poisson's ratio concave honeycomb structure provided in this embodiment and the traditional concave hexagonal honeycomb structure under compressive deformation.

[0039] Figure label:

[0040] 10. Deck; 20. Three-dimensional concave reinforced structure base; 30. Power equipment; 40. Negative Poisson's ratio concave cell structure; 41. Concave hexagonal structure; 411. First horizontal cell wall; 412. Second horizontal cell wall; 413. First concave bending structure; 4131. First inclined cell wall; 4132. Second inclined cell wall; 414. Second concave bending structure; 4141. Third inclined cell wall; 4142. Fourth inclined cell wall; 42. First rhomboid structure; 421. Fifth inclined cell wall; 422. Sixth inclined cell wall; 423. Seventh inclined cell wall; 424. Eighth inclined cell wall; 43. Second rhomboid structure; 431. Ninth inclined cell wall; 432. Tenth inclined cell wall; 433. Eleventh inclined cell wall; 434. Twelfth inclined cell wall; 50. Top plate. Detailed Implementation

[0041] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0042] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0043] Unless otherwise stated, the term "multiple" means two or more.

[0044] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0045] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0046] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0047] Combination Figure 1 As shown, this disclosure provides a design method for a jack-up marine platform, including:

[0048] S101, insert the lifting support device into the seabed and install the deck onto the lifting support device;

[0049] S102, a three-dimensional concave reinforced structure base is fabricated using a negative Poisson's ratio concave cell structure; the negative Poisson's ratio concave cell structure includes: a first horizontal cell wall and a second horizontal cell wall; a first rhombus structure and a second rhombus structure, each composed of four inclined cell walls; the connection point of the bottom inclined cell wall of the first rhombus structure is connected to the connection point of the top inclined cell wall of the second rhombus structure to form a double rhombus structure; the double rhombus structure is embedded in the concave hexagon, and the top endpoint of the double rhombus structure is connected to the first horizontal cell wall, and the bottom endpoint of the double rhombus structure is connected to the second horizontal cell wall;

[0050] S103, a three-dimensional concave reinforced structure base is installed at a predetermined position on the deck;

[0051] S104, power equipment is installed on a three-dimensional concave reinforced structural base.

[0052] Combination Figure 2 As shown, a lifting support device is inserted into the seabed using a crane. After the lifting support device is stabilized, the deck 10 is then installed onto the lifting support device using the crane. A three-dimensional concave reinforced structural base 20 is fabricated using a negative Poisson's ratio concave cell structure 40. Pre-defined positions on the deck 10 are used to install various power equipment 30, such as diesel engines. The three-dimensional concave reinforced structural base 20 is installed at the pre-defined positions, and then the corresponding power equipment 30 is installed on top of the three-dimensional concave reinforced structural base 20.

[0053] Among them, combined Figure 3 As shown, the negative Poisson's ratio concave cell structure 40 includes: a concave hexagonal structure 41, a first rhombic structure 42, and a second rhombic structure 43.

[0054] Combination Figure 4 As shown, the concave hexagonal structure 41 includes: a first horizontal cell wall 411, a second horizontal cell wall 412, a first concave bending structure 413, and a second concave bending structure 414. The first horizontal cell wall 411 and the second horizontal cell wall 412 are arranged side by side in the vertical direction. The first horizontal cell wall 411 has a first end point and a second end point, and the second horizontal cell wall 412 has a third end point and a fourth end point, wherein the first end point and the third end point are located on the same side, and the second end point and the fourth end point are located on the other side. The two concave bending structures are arranged side by side in the horizontal direction, and the top and bottom ends of the first concave bending structure 413 are connected to the first end point and the third end point, respectively, and the top and bottom ends of the second concave bending structure 414 are connected to the second end point and the fourth end point, respectively. In this way, the first horizontal cell wall 411, the second horizontal cell wall 412, the first concave bending structure 413, and the second concave bending structure 414 together form a closed concave hexagonal structure 41.

[0055] Combination Figure 5 As shown, the first rhomboid structure 42 and the second rhomboid structure 43 have the same structure, both consisting of four sloping cell walls, divided into two sloping cell walls at the top and two sloping cell walls at the bottom. The connection points of the two sloping cell walls at the bottom of the first rhomboid structure 42 connect with the connection points of the two sloping cell walls at the top of the second rhomboid structure 43, thus forming a longitudinally arranged double rhomboid structure. See again. Figures 3 to 5 The double rhombus structure is embedded within the concave hexagonal structure 41. The top of the double rhombus structure, i.e., the connection point of the two inclined cell walls at the top of the first rhombus structure 42, is connected to the first horizontal cell wall 411. The bottom of the double rhombus structure, i.e., the connection point of the two inclined cell walls at the bottom of the second rhombus structure 43, is connected to the second horizontal cell wall 412.

[0056] The design method for a jack-up offshore platform provided in this embodiment utilizes a negative Poisson's ratio concave cell structure to fabricate a three-dimensional concave reinforced structural base. This negative Poisson's ratio structure is a concave hexagonal structure with embedded double rhombus structures. The double rhombus structure provides additional support during the deformation of the concave hexagonal structure without affecting its deformation. This significantly improves the overall stiffness, load-bearing capacity, and energy absorption characteristics of the structure without compromising its negative Poisson's ratio. Therefore, when designing a jack-up offshore platform, installing the three-dimensional concave reinforced structural base between the deck and the power equipment improves the vibration isolation, shock resistance, and energy absorption effects for the power equipment, ensuring the safe operation of both the power equipment and the offshore platform.

[0057] Optionally, by adjusting the structural parameters of the double rhombus structure, the structural performance can be controlled, thereby effectively meeting the design requirements in the project.

[0058] Optionally, see again Figure 4The first concave bending structure 413 includes a first inclined cell wall 4131 and a second inclined cell wall 4132. The top end of the first inclined cell wall 4131 is connected to the first end point of the first horizontal cell wall 411, the bottom end of the first inclined cell wall 4131 is connected to the top end of the second inclined cell wall 4132, and the bottom end of the second inclined cell wall 4132 is connected to the third end point of the second horizontal cell wall 412. The second concave bending structure 414 includes a third inclined cell wall 4141 and a fourth inclined cell wall 4142. The top end of the third inclined cell wall 4141 is connected to the second end point of the first horizontal cell wall 411, the bottom end of the third inclined cell wall 4141 is connected to the top end of the fourth inclined cell wall 4142, and the bottom end of the fourth inclined cell wall 4142 is connected to the fourth end point of the second horizontal cell wall 412. In the horizontal direction, the first inclined cell wall 4131 corresponds to the third inclined cell wall 4141, and the second inclined cell wall 4132 corresponds to the fourth inclined cell wall 4142. In this way, the concave hexagonal structure 41 forms a horizontally and vertically (up, down, left, and right) symmetrical structure.

[0059] Optionally, the top endpoint of the double rhombus structure, i.e., the connection point of the two inclined cell walls at the top of the first rhombus structure 42, is connected to the midpoint of the first horizontal cell wall 411. The bottom endpoint of the double rhombus structure, i.e., the connection point of the two inclined cell walls at the bottom of the second rhombus structure 43, is connected to the midpoint of the second horizontal cell wall 412. This creates a closed structure in which the negative Poisson's ratio concave cell structure 40 is symmetrical both horizontally and vertically (up, down, left, and right) and concave on both sides laterally (left and right). This allows for more uniform stress distribution on the negative Poisson's ratio concave cell structure 40, thereby improving its vibration isolation, shock resistance, and energy absorption properties. Optionally, the first rhombus structure 42 is located above the second rhombus structure 43 (relative to...). Figure 3 In other words).

[0060] Optionally, see again Figure 5 The first rhomboid structure 42 includes a fifth inclined cell wall 421, a sixth inclined cell wall 422, a seventh inclined cell wall 423, and an eighth inclined cell wall 424 connected sequentially in a clockwise direction. The fifth inclined cell wall 421 and the sixth inclined cell wall 422 are the two inclined cell walls at the top of the first rhomboid structure 42, and the seventh inclined cell wall 423 and the eighth inclined cell wall 424 are the two inclined cell walls at the bottom of the first rhomboid structure 42.

[0061] Optionally, see [link to relevant documentation] Figure 5The second rhomboid structure 43 includes: a ninth inclined cell wall 431, a tenth inclined cell wall 432, an eleventh inclined cell wall 433, and a twelfth inclined cell wall 434 connected sequentially in a clockwise direction, wherein the ninth inclined cell wall 431 and the tenth inclined cell wall 432 are the two inclined cell walls at the top of the second rhomboid structure 43, and the eleventh inclined cell wall 433 and the twelfth inclined cell wall 434 are the two inclined cell walls at the bottom of the second rhomboid structure 43.

[0062] Optionally, the centroid of the first rhombic structure 42, the midpoint of the first inclined cell wall 4131, and the midpoint of the third inclined cell wall 4141 are located on the same horizontal axis. The centroid of the second rhombic structure 43, the midpoint of the second inclined cell wall 4132, and the midpoint of the fourth inclined cell wall 4142 are located on the same horizontal axis. In this way, the structure maintains geometric symmetry, and thus effectively improves structural stability through symmetrical stress distribution characteristics during deformation under stress.

[0063] Optionally, see again Figures 3 to 5 Point A is defined as the connection point between the first rhombic structure 42 and the second rhombic structure 43. Point A, the midpoint of the first horizontal cell wall 411, and the midpoint of the second horizontal cell wall 412 are all located on the same vertical axis. Point B is defined as the connection point between the first inclined cell wall 4131 and the second inclined cell wall 4132, and point C is defined as the connection point between the third inclined cell wall 4141 and the fourth inclined cell wall 4142. Points A, B, and C are all located on the same horizontal axis. This avoids collisions and interference between the sidewalls of the rhombic structure and the concave hexagonal structure 41 during deformation, thus ensuring the stability and integrity of the structure during movement, reducing potential damage risks, and improving the overall energy absorption effect.

[0064] Optionally, combined Figure 6 As shown, the wall thickness at various locations of the concave hexagonal structure 41 Similarly, the wall thickness at various locations in the double rhombus structure is... Same, and > This enhances the load-bearing capacity of the sidewalls of the concave hexagonal structure 41 and maintains the symmetry and stability of the entire structure during deformation.

[0065] Optionally, see again Figure 6 The concave hexagonal structure 41 has each inclined cell wall connected to the first horizontal cell wall 411 or the second horizontal cell wall 412 at a first preset angle. The angle is set such that the first horizontal cell wall 411 and the first inclined cell wall 4131 and the third inclined cell wall 4141 form a first preset angle. Angle setting. The second horizontal cell wall 412 forms a first preset angle with the second inclined cell wall 4132 and the fourth inclined cell wall 4142. Angle setting. First preset angle. Satisfy: 0° < < 90°, to ensure that the tilted cell wall bends inward when the cell is compressed.

[0066] See you again Figure 6 The inclined cell walls of the double rhomboid structure form a second predetermined angle with the vertical axis containing the midpoint of the first horizontal cell wall 411 and the vertical axis containing the midpoint of the second horizontal cell wall 412. Angle setting. Second preset angle. Satisfy: 0° < < 90°, ensuring the reinforcement structure is a double rhomboid structure with sufficient deformation space.

[0067] Optionally, see again Figure 6 The lengths of the first horizontal cell wall 411 and the second horizontal cell wall 412 Same. The lengths of the inclined cell walls of each concave hexagonal structure 41 are the same. Same. The lengths of the sloping cell walls of the rhomboid structure are the same. The same applies. This ensures the symmetry of the inner and outer layers composed of the rhomboid structure and the concave hexagonal structure 41, giving the structure high stability during deformation and avoiding asymmetrical failure modes.

[0068] Optionally, to ensure that the concave hexagonal structure 41 and the double rhombus structure are parallel independent structures in the undeformed stage of the cell, the cell structure satisfies: .

[0069] Optionally, to avoid collisions between the bending points of the concave hexagonal structure 41 and the bending points of the double rhombus structure during the compaction stage, the cell structure satisfies: , .

[0070] Combination Figure 7 As shown in Figure S102, a three-dimensional concave reinforced structural base is fabricated using a negative Poisson's ratio concave cell structure, including:

[0071] S112, the negative Poisson's ratio concave cell structure is periodically arranged and combined in the plane to form a two-dimensional concave reinforced honeycomb structure;

[0072] S122, the two-dimensional concave reinforced honeycomb structure is stretched laterally to form a three-dimensional concave reinforced honeycomb structure;

[0073] S132, the three-dimensional concave reinforced honeycomb structure is orthogonally arrayed to form a three-dimensional concave reinforced structure base;

[0074] S142, A top plate is provided on top of the three-dimensional concave reinforced structure base.

[0075] Combination Figure 8 As shown, negative Poisson's ratio concave cell structures 40 are periodically arranged in a plane to form a two-dimensional concave reinforced honeycomb structure. The vertical arrangement rules are as follows: the negative Poisson's ratio concave cell structures 40 are arranged in several rows along the longitudinal direction, and adjacent negative Poisson's ratio concave cell structures 40 share the same horizontal cell wall; the horizontal arrangement rules are as follows: they are arranged in several columns along the transverse direction, and the vertical spacing between adjacent negative Poisson's ratio concave cell structures 40 is half the height of the negative Poisson's ratio concave cell structure 40, and adjacent negative Poisson's ratio concave cell structures 40 share an inclined cell wall.

[0076] Combination Figure 9 As shown, a two-dimensional concave reinforced honeycomb structure is laterally stretched to form a three-dimensional concave reinforced honeycomb structure. Optionally, the cross-section of each cell wall is rectangular, and the out-of-plane width of the cell is ( Figure 9 The width of the mesocell along the Z-axis can be selected according to the actual situation.

[0077] Combination Figure 10 As shown, a three-dimensional concave reinforced honeycomb structure is then orthogonally arrayed to form a three-dimensional concave reinforced structure base 20. The cell structure parameters are selected through static analysis, requiring that the structural strength meet the requirements while ensuring the three-dimensional concave reinforced structure base 20 has a relatively light mass. To ensure uniform stress distribution on the three-dimensional concave reinforced structure base 20, a top plate 50 is provided on top of the three-dimensional concave reinforced structure base 20.

[0078] Combination Figures 11 to 12 As shown, when a two-dimensional concave reinforced honeycomb structure is compressed (aluminum alloy can be used), the inclined cell walls of the cells bend inward, the double-rhomboid structure deforms vertically, and the overall cell structure undergoes lateral contraction, producing a negative Poisson's ratio effect. The negative Poisson's ratio concave honeycomb structure absorbs externally input energy through structural deformation, acting as an energy-absorbing buffer. In contrast, combined with... Figures 13 to 14 As shown, the traditional concave hexagonal honeycomb structure (also made of aluminum alloy) undergoes greater deformation under the same compression.

[0079] Combination Figure 15 As shown in the figure, the comparison results of the stress-strain curves of the two-dimensional concave reinforced honeycomb structure provided in this embodiment and the traditional concave hexagonal honeycomb structure under compression deformation show that the platform stress of the two-dimensional concave reinforced honeycomb structure provided in this embodiment is significantly higher than that of the traditional concave hexagonal honeycomb structure, and it has higher load-bearing capacity and higher energy absorption.

[0080] Combination Figure 16As shown, the comparison results of the specific energy absorption-strain curves of the two-dimensional concave reinforced honeycomb structure provided in this embodiment and the traditional concave hexagonal honeycomb structure under compression deformation show that the specific energy absorption of the two-dimensional concave reinforced honeycomb structure provided in this embodiment is always higher than that of the traditional concave hexagonal honeycomb structure throughout the deformation process, and it has better energy absorption characteristics.

[0081] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method of designing a jack-up offshore platform, characterized in that, The method comprises the following steps: inserting a lifting support device into the seabed and installing a deck on the lifting support device; manufacturing a three-dimensional concave reinforcing structure base by using a negative Poisson's ratio concave cell structure; installing the three-dimensional concave reinforcing structure base at a predetermined position on the deck; installing a power equipment on the three-dimensional concave reinforcing structure base; wherein the negative Poisson's ratio concave cell structure comprises: a concave hexagonal structure comprising a first horizontal cell wall, a second horizontal cell wall, a first concave bending structure and a second concave bending structure; a first rhombic structure and a second rhombic structure, each composed of four inclined cell walls; the connecting point of the bottom inclined cell wall of the first rhombic structure is connected with the connecting point of the top inclined cell wall of the second rhombic structure to form a double rhombic structure; the double rhombic structure is embedded in the concave hexagonal structure, and the top end point of the double rhombic structure is connected with the first horizontal cell wall, and the bottom end point of the double rhombic structure is connected with the second horizontal cell wall.

2. The design method of the self-elevating offshore platform according to claim 1, wherein the top end point of the double rhombic structure is connected with the midpoint of the first horizontal cell wall, and the bottom end point of the double rhombic structure is connected with the midpoint of the second horizontal cell wall, so that the negative Poisson's ratio concave cell structure forms a closed structure which is symmetrical in horizontal and vertical directions and concave on both sides in horizontal direction.

3. The method of designing a jack-up offshore platform according to claim 1, wherein, the first concave bending structure is connected by a first inclined cell wall and a second inclined cell wall; the second concave bending structure is connected by a third inclined cell wall and a fourth inclined cell wall; wherein the first inclined cell wall corresponds to the third inclined cell wall in horizontal direction, and the second inclined cell wall corresponds to the fourth inclined cell wall in horizontal direction.

4. The design method of the self-elevating offshore platform according to claim 3, wherein the centroid of the first rhombic structure and the midpoints of the first inclined cell wall and the third inclined cell wall are located on the same horizontal axis; the centroid of the second rhombic structure and the midpoints of the second inclined cell wall and the fourth inclined cell wall are located on the same horizontal axis.

5. The design method of the self-elevating offshore platform according to claim 3, wherein the connecting point of the first rhombic structure and the second rhombic structure, the midpoints of the first horizontal cell wall and the second horizontal cell wall, and the connecting points of the first inclined cell wall and the second inclined cell wall and the third inclined cell wall and the fourth inclined cell wall are located on the same vertical axis and the same horizontal axis.

6. The design method of the self-elevating offshore platform according to claim 1, wherein the wall thickness of the concave hexagonal structure is greater than the wall thickness of the double rhombic structure.

7. The design method of the self-elevating offshore platform according to claim 1, wherein each inclined cell wall of the inner concave hexagonal structure and the first horizontal cell wall or the second horizontal cell wall connected therewith forms a first preset angle The first preset angle is set to satisfy: 0° < 90°; and / or, each inclined cell wall of the double-rhombus structure forms a second preset angle with a vertical axis where a midpoint of the first horizontal cell wall is located, and with a vertical axis where a midpoint of the second horizontal cell wall is located the angle setting, the second preset angle satisfies: 0° < 90°.

8. The design method of the self-elevating offshore platform according to claim 7, wherein the length of the first horizontal cell wall and the second horizontal cell wall the same; the length of each sloped cell wall of the concave hexagonal structure the same; the length of each of the oblique cell walls of the rhombic structure are identical.

9. The design method of the self-elevating offshore platform according to claim 8, wherein ; and / or, , .

10. A method of designing a jack-up offshore platform according to any one of claims 1 to 9, characterized in that, the manufacturing of the three-dimensional concave reinforcing structure base by using the negative Poisson's ratio concave cell structure comprises: The negative Poisson's ratio inner recessed cell structure is combined in a plane periodically to form a two-dimensional inner recessed reinforced honeycomb structure; The two-dimensional inner recessed reinforced honeycomb structure is stretched transversely to form a three-dimensional inner recessed reinforced honeycomb structure; The three-dimensional inner recessed reinforced honeycomb structure is arranged orthogonally to form a three-dimensional inner recessed reinforced structure base; A top plate is arranged on the top of the three-dimensional inner recessed reinforced structure base.

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