Self-locking connecting structure of offshore self-lifting tower drum and implementation method

Abstract

The invention discloses a self-locking connecting structure of an offshore self-lifting tower drum and an implementation method. The self-locking connecting structure comprises a first section of tower drum, a second section of tower drum and a drum section connecting structure, the second section of tower drum is positioned on the inner side of the first section of tower drum; the connecting structure between the barrel sections comprises a first section of tower barrel top flange, a second section of tower barrel bottom flange, a telescopic bracket, a plurality of bolts, a self-locking connecting device and an anti-bending pin. The first section of tower drum and the second section of tower drum are connected through a drum section connecting structure; the first section of tower drum comprises a first section of tower drum wall; the second section of tower drum comprises a second section of tower drum wall; the second section of tower barrel bottom flange is positioned below the first section of tower barrel top flange; and each self-locking connecting device is used for fastening and connecting the first section of tower drum and the second section of tower drum by automatically locking the corresponding bolt. According to the self-locking connecting structure, stable operation can be guaranteed in the telescopic lifting process, the excellent stress performance is achieved, and the reliability and safety of the lifting type tower drum in the complex marine environment are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the offshore wind power technology field, in particular to a self-locking connection structure of an offshore self-lifting tower drum and an implementation method. BACKGROUND

[0002] With the continuous increase of the capacity of wind turbine generators, the single machine capacity of the current offshore wind turbine generator has reached 26MW, and the requirements for the height and stability of the tower drum have also increased.

[0003] However, the traditional offshore tower drum hoisting scheme has the disadvantages of high cost, high dependence on a crane ship, and complex construction process. These problems not only restrict the overall construction efficiency, but also significantly increase the economic investment of the project, so that the existing technology cannot meet the installation requirements in the large-capacity unit and deep water environment.

[0004] At present, in response to the above challenges, the self-lifting tower drum technology has emerged. This technology first shrinks the telescopic tower drum to the lowest state on the shore or in shallow waters, and then uses a floating installation ship to transport it to the destination sea area; then use the lifting driving device to lift the tower drum to the designed height step by step, and finally complete the floating installation. Compared with the traditional hoisting, the self-lifting tower drum technology reduces the dependence on large cranes, can use modular and batched quick installation methods, greatly improves the construction efficiency, and effectively shortens the dependence time on the good weather window period of the sea, thereby improving the installation feasibility of deep-sea large-capacity wind turbine generators.

[0005] However, the connection node between the telescopic tower drums has become a key weak link restricting the further popularization and application of the self-lifting technology. At present, most of the connection schemes between the traditional telescopic tower drums have deficiencies in the telescopic performance, local bearing capacity and connection reliability, and in view of the fact that the strength and stress performance of the connection part has a crucial influence on the safety and stability of the overall structure in the design of high tower drums and large units, the connection structure design of the traditional telescopic tower drums obviously restricts the use of the self-lifting tower drum technology in larger units and deeper water environments.

[0006] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. SUMMARY

[0007] The purpose of the present application is to provide a self-locking connection structure of an offshore self-lifting tower drum and an implementation method to solve the technical defects of the prior art.

[0008] To this end, the present application provides a self-locking connection structure of an offshore self-lifting tower drum, which comprises a first tower drum, a second tower drum and a drum section connection structure A;

[0009] The second tower drum is located in the inner side direction of the first tower drum.

[0010] The first tower section and the second tower section are connected through the section-to-section connecting structure A;

[0011] The section-to-section connecting structure A comprises a first tower section top flange, a second tower section bottom flange, a plurality of telescopic brackets, a plurality of bolts, a plurality of self-locking connecting devices and a plurality of anti-bending pins.

[0012] The first tower section comprises a first tower section wall;

[0013] The circular first tower section top flange is circumferentially arranged on the top of the first tower section wall and protrudes inwardly.

[0014] The second tower section comprises a second tower section wall;

[0015] The circular second tower section bottom flange is circumferentially arranged on the bottom of the second tower section wall and protrudes outwardly.

[0016] The second tower section bottom flange is located directly below the first tower section top flange.

[0017] The plurality of telescopic brackets are circumferentially and equidistantly arranged on the inner side of the first tower section wall, used to contact the bottom surface of the second tower section bottom flange and support the second tower section bottom flange upwardly.

[0018] The plurality of bolts are vertically arranged through the second tower section bottom flange and the first tower section top flange and connected to the plurality of self-locking connecting devices.

[0019] Each self-locking connecting device is used to automatically lock one corresponding bolt to achieve the fastening connection of the first tower section and the second tower section.

[0020] In addition, the application provides an implementation method of the self-locking connecting structure of the offshore self-lifting tower section as described above, which comprises the following steps:

[0021] Step S1: transporting the first tower section and the second tower section to a pre-required installation destination; the outer side of the top of the first tower section is provided with a centralizing support frame, and the top of the centralizing support frame is provided with a lifting driving device;

[0022] Step S2: performing the lifting and self-locking operation of the tower section at the pre-required installation destination: the lifting driving device embraces the second tower section and applies an upward lifting force, and under the action of the lifting driving device, the second tower section is gradually pulled out of the first tower section upwardly and smoothly rises in the vertical direction;

[0023] When the second tower section is lifted to a pre-designed height, the two tower sections are automatically locked and fixed through the section-to-section connecting structure A, so that the two tower sections are safely and reliably positioned.

[0024] From the above technical solutions provided by the present application, compared with the prior art, the present application provides a self-locking connection structure of a self-lifting tower drum at sea and an implementation method, which is scientific in design and has a self-locking connection structure. The structure can ensure smooth operation during extension and retraction and can be automatically locked after the tower drum is lifted to a predetermined position. In addition, the structure has excellent stress performance, thereby effectively overcoming the problems of insufficient strength and poor stress performance of the connection part between traditional telescopic tower drums, significantly improving the reliability and safety of the lifting tower drum (i.e., the telescopic tower drum) in a complex marine environment, and having great practical significance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The self-locking connection structure of a self-lifting tower drum at sea provided by the present application is a whole structure schematic diagram before lifting the tower drum;

[0026] Figure 2 The self-locking connection structure of a self-lifting tower drum at sea provided by the present application is a structure schematic diagram after lifting the tower drum;

[0027] Figure 3 The self-locking connection structure of a self-lifting tower drum at sea provided by the present application is a three-dimensional structure schematic diagram of the A part area after lifting the tower drum and cutting along the radial direction of the tower drum;

[0028] Figure 4 The self-locking connection structure of a self-lifting tower drum at sea provided by the present application is a local enlarged view of the A-1 part; Figure 3

[0029] Figure 5 The self-locking connection structure of a self-lifting tower drum at sea provided by the present application is a cross-sectional structure plane schematic diagram of the A-1 part area in the first lifting stage;

[0030] Figure 6 The self-locking connection structure of a self-lifting tower drum at sea provided by the present application is a cross-sectional structure plane schematic diagram of the A-1 part area in the second lifting stage;

[0031] Figure 7 The self-locking connection structure of a self-lifting tower drum at sea provided by the present application is a cross-sectional structure plane schematic diagram of the A-1 part area in the third lifting stage;

[0032] Figure 8 The self-locking connection structure of a self-lifting tower drum at sea provided by the present application is a cross-sectional structure plane schematic diagram of the A-1 part area in the fourth lifting stage;

[0033] Figure 9 ​The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0034] Figure 10 The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0035] Figure 11a The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0036] Figure 11b The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0037] Figure 11c The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0038] Figure 11d The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0039] Figure 12 The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0040] Figure 13 The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0041] Figure 14 The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0042] Figure 15 The self-locking connection structure of the offshore self-lifting tower drum provided by the application is shown in the cross-sectional structure plane schematic diagram of the A-1 part area in the fifth stage of lifting, that is, the cross-sectional view when the assembly is completed;

[0043] In the figure, 1 is a first tower drum, 2 is a second tower drum, 3 is a telescopic bracket, 4 is a bolt, 5 is a self-locking connection device, 6 is a bending-resistant pin, 7 is a vertical connection gap, 8 is a horizontal connection gap, 9 is a floating installation ship, 10 is a lifting driving device, 11 is a righting support frame, 12 is a machine head, 13 is a guide pipe support structure, and 14 is a drum foundation.

[0044] 1-1, the wall of the first tower section; 1-2, the top flange of the first tower section; 1-3, the local reinforcement steel plate of the first tower section;

[0045] 2-1, wall of the second tower section; 2-2, bottom flange of the second tower section;

[0046] 3-1. Retractable bracket anchor bolts; 3-2. Fixed diagonal brace; 3-3. Retractable platform;

[0047] 4-1, bolt thread, 4-2, limit bolt hole;

[0048] 5-1. Outer sleeve; 5-2. Limiting device; 5-3. Conical buckle; 5-4. Conical wedge block; 5-5. Latch; 5-6. Spring device; 5-7. Limiting buckle. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set. Those skilled in the art will understand the specific meanings of the above terms in this patent based on the specific circumstances.

[0052] Moreover, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0053] Referring to Figures 1 to 10 , Figures 11a to 11d and Figures 12 to 15 , the present application provides a self-locking connection structure of a self-elevating offshore tower, comprising a first tower section 1, a second tower section 2 and a section-to-section connection structure A;

[0054] The second tower section 2 is located in the inner side direction of the first tower section 1;

[0055] The first tower section 1 and the second tower section 2 are connected through the section-to-section connection structure A;

[0056] The section-to-section connection structure A comprises a first tower section top flange 1-2, a second tower section bottom flange 2-2, a telescopic bracket 3, a plurality of bolts 4, a self-locking connection device 5 and a bending-resistant pin 6.

[0057] The first tower section 1 comprises a first tower section wall 1-1;

[0058] The circular ring-shaped first tower section top flange 1-2 is circumferentially arranged at the top of the first tower section wall 1-1 and protrudes inwardly;

[0059] The second tower section 2 comprises a second tower section wall 2-1;

[0060] The circular ring-shaped second tower section bottom flange 2-2 is circumferentially arranged at the bottom of the second tower section wall 2-1 and protrudes outwardly;

[0061] The second tower section bottom flange 2-2 is located below the first tower section top flange 1-2;

[0062] The plurality of telescopic brackets 3 are circumferentially and equidistantly arranged on the inner side of the first tower section wall 1-1, used to contact the bottom surface of the second tower section bottom flange 2-2 and support the second tower section bottom flange 2-2 upwardly;

[0063] The plurality of bolts 4 are used to vertically penetrate through the second tower section bottom flange 2-2 and the first tower section top flange 1-2 and correspondingly connected with the plurality of self-locking connection devices 5;

[0064] Each self-locking connection device 5 is used to automatically lock one corresponding bolt 4 to achieve the tight connection between the first tower section 1 and the second tower section 2.

[0065] It should be noted that in the present application, the first tower section 1 is the outer tower section, and the second tower section 2 is the inner tower section. The outer tower section and the inner tower section are tightly combined through the section-to-section connecting structure A, and all the tower sections are made of high-strength steel to ensure the structural stability and durability in the offshore environment.

[0066] In the present application, as shown in Figure 3 , Figure 4 It should be noted that in the field of wind power technology, the tower section is a circular ring section tower section, which is hollow. At the bottom of the tower section (for example, the tower section 2), an L-shaped flange is arranged, which can be a small structure extending outward (or protruding inward) from the tower section. In the present application, the first tower section 1 and the second tower section are also hollow circular ring section tower sections. The second tower section bottom flange 2-2 is a structure extending outward from the second tower section wall 2-1, and the first tower section top flange 1-2 is a structure protruding inward from the first tower section wall 1-1.

[0067] It should be noted that for the present application, the tower section and the flange are common structures in wind power. The flange is formed by steel casting. The tower section is also formed by steel plate rolling. In the factory, the tower section and the flange are connected by welding.

[0068] It should be noted that for the present application, the tower section and the flange are common structures in wind power. The flange is formed by steel casting. The tower section is also formed by steel plate rolling. In the factory, the tower section and the flange are connected by welding.

[0069] In the present application, in specific implementation, the section-to-section connecting structure A further comprises a bending-resistant pin 6.

[0070] The bending-resistant pin 6 is used to transversely penetrate through the first mounting hole on the first tower section wall 1-1 and the second mounting hole on the second tower section bottom flange 2-2, and realize plug-in fixing.

[0071] It should be noted that for the present application, the first tower section 1 and the second tower section 2 constitute the main body of the self-lifting structure, and when the two are connected after lifting is completed, they mainly rely on the bolts 4, the self-locking connecting device 5 and the bending-resistant pin 6.

[0072] In the present application, in specific implementation, for the first tower section 1, the first tower section wall 1-1 is a steel wall.

[0073] The first tower section wall 1-1 and the first tower section top flange 1-2 are connected by butt welding, which is a common connection scheme for wind power steel tower sections. In order to enhance the local carrying capacity of the connection node and avoid buckling failure under stress, a layer of first tower section local reinforcing steel plate 1-3 is welded on the outside of the first tower section wall 1-1.

[0074] In the present application, specifically, for the second section tower drum 2, the second section tower drum drum wall 2-1 is a steel drum wall;

[0075] The second section tower drum drum wall 2-1 and the second section tower drum bottom flange 2-2 are also connected by butt welding.

[0076] In the present application, specifically, the bolt 4 is used to vertically penetrate through the second section tower drum bottom flange 2-2 and the first section tower drum top flange 1-2 and is connected with the self-locking connecting device 5, and the specific structural design is as follows:

[0077] A plurality of (not limited to one) second flange bolt holes 2-20 are vertically and penetratingly arranged on the second section tower drum bottom flange 2-2;

[0078] The first section tower drum top flange 1-2 is respectively provided with a first flange bolt hole 1-20 at a position corresponding to each second flange bolt hole 2-20;

[0079] The nut of each bolt 4 is welded and fixed to the bottom of the second section tower drum bottom flange 2-2;

[0080] The shank of each bolt 4 sequentially penetrates through the second flange bolt hole 2-20 on the second section tower drum bottom flange 2-2 and the first flange bolt hole 1-20 on the first section tower drum top flange 1-2 from bottom to top, and is connected with the self-locking connecting device 5;

[0081] The self-locking connecting device 5 is located at the top of the first section tower drum top flange 1-2.

[0082] It should be noted that, for the present application, the second section tower drum bottom flange 2-2 is firmly welded with the bolt 4, and the upper shank of the bolt 4 penetrates out of the second section tower drum bottom flange 2-2 after penetrating through the second flange bolt hole 2-20. In addition, under the driving of the external lifting driving device 10, when the second section tower drum 2 is lifted upwards along the first section tower drum 1, the bolt 4 will also move upwards synchronously.

[0083] In the present application, specifically, each self-locking connecting device 5 comprises an outer sleeve 5-1, a limiting device 5-2, a conical buckle 5-3, a conical wedge block 5-4, and a latch 5-5;

[0084] The hollow outer sleeve 5-1 is provided with the conical wedge block 5-4 distributed around;

[0085] The conical wedge block 5-4 is fixedly arranged at the top of the first section tower drum top flange 1-2;

[0086] The conical wedge block 5-4 is arranged correspondingly with the bolt 4;

[0087] The inner side wall of the central through hole of the conical wedge block 5-4 is fitted with the circumferential outer surface of the conical buckle 5-3.

[0088] The inner side of the conical buckle 5-3 has a thread for engaging with the outer thread of the screw rod of the bolt 4;

[0089] The inner side of the conical buckle 5-3 has a thread for engaging with the outer thread of the screw rod of the bolt 4;

[0090] The upper side of the conical buckle 5-3 has a limiting device 5-2;

[0091] One end of the limiting device 5-2 is arranged on the inner wall (e.g. the left inner wall) of the outer sleeve 5-1 in a sliding manner;

[0092] The inner side of the limiting device 5-2 is provided with a horizontally distributed limiting slot 5-20;

[0093] The outer sleeve 5-1 is provided with an elastic expansion plug 5-5 on the inner wall (e.g. the right inner wall) away from the limiting slot 5-20;

[0094] The plug 5-5 is used to pass through the limiting bolt hole 4-2 on the bolt 4 and then inserted into the limiting slot 5-20 of the limiting device 5-2.

[0095] Specifically, the upper part of the bolt 4 has a limiting bolt hole 4-2 arranged in a horizontal manner;

[0096] The limiting bolt hole 4-2 is arranged corresponding to the plug 5-5 in the self-locking connecting device 5.

[0097] Further, the shape and size of the limiting bolt hole 4-2 correspond to the shape and size of the plug 5-5 in the self-locking connecting device 5.

[0098] The central axis of the limiting bolt hole 4-2 and the central axis of the plug 5-5 in the self-locking connecting device 5 are both horizontally distributed and located on the same vertical plane.

[0099] Specifically, the central through hole of the conical wedge block 5-4 is a circular conical through hole;

[0100] Specifically, the limiting device 5-2 is arranged on the left inner wall of the outer sleeve 5-1 in a sliding manner; the specific structure can be: the first structure: the left inner wall of the outer sleeve 5-1 is provided with a vertically distributed first sliding groove; the left side of the limiting device 5-2 is provided with a first sliding block; the first sliding block is located in the first sliding groove and is in sliding cooperation with the first sliding groove;

[0101] Or, the second structure: the left inner wall of the outer sleeve 5-1 is provided with a vertically distributed first sliding rail; the left side of the limiting device 5-2 is provided with a first sliding block; the first sliding block is arranged on the first sliding rail and is in sliding cooperation with the first sliding rail;

[0102] Specifically, the plug 5-5 is connected to the inner wall of the outer sleeve 5-1 through the spring device 5-6;

[0103] The spring device 5-6 comprises a spring assembly housing 5-61 and a spring 5-62;

[0104] The spring assembly housing 5-61 is horizontally distributed and is open to one side of the limiting groove 5-20;

[0105] The spring assembly housing 5-61 is provided with one end of the helical spring 5-62 away from the limiting groove 5-20;

[0106] The other end of the spring 5-62 is connected to the outer side end of the plug 5-5 away from the limiting groove 5-20.

[0107] Further, the spring device 5-6 is arranged to be slidable up and down on the inner wall (for example, the right inner wall) of the outer sleeve 5-1; the specific structure can be: a first structure: a vertically distributed second sliding groove is arranged on the right inner wall of the outer sleeve 5-1; a second sliding block is arranged on the right side of the spring assembly housing 5-61 of the spring device 5-6; the second sliding block is located in the second sliding groove and is in sliding cooperation with the second sliding groove;

[0108] Alternatively, a second structure: a vertically distributed second sliding rail is arranged on the right inner wall of the outer sleeve 5-1; a second sliding block is arranged on the right side of the spring assembly housing 5-61 of the spring device 5-6; the second sliding block is arranged on the second sliding rail and is in sliding cooperation with the second sliding rail.

[0109] It should be noted that the cooperation structure design of the sliding block and the sliding rail (for example, a linear guide rail) is a mature conventional design in the prior art, which will not be described here.

[0110] It should be noted that the sliding cooperation design of the sliding block and the sliding groove is a mature conventional design in the prior art, which will not be described here. For example, the sliding groove can be a T-shaped, vertically distributed groove, and one end of the sliding block can be a T-shaped protrusion. The T-shaped protrusion is located in the T-shaped groove and is in sliding cooperation, and the shape and size are correspondingly matched. The sliding cooperation design between the T-shaped groove and the sliding block is a conventional known design, which will not be described here.

[0111] It should be noted that in the initial state, the limiting device 5-2 and the spring device 5-6 are located at the fixed position of the side wall of the outer sleeve 5-1. When the second section tower tube 2 is lifted to a certain position, the plug 5-5 will be inserted into the limiting groove 5-20 of the limiting device 5-2 (see the description of the plug locking operation in the third stage below). Again, see the description of the cone-shaped buckle locking operation in the fourth stage below (see Figure 8) records that when the second tower section 2 drives the bolt 4 downward a small distance, it also drives the latch 5-5 downward a distance. At this time, the latch 5-5, together with the limit device 5-2 and the spring device 5-6, slides downward a short distance along the slide rail on the side wall of the outer sleeve 5-1, and begins to press down on the tapered buckle 5-3, locking the entire structure.

[0112] In specific implementation, the conical buckle 5-3 includes three buckle petals equally divided along the radial direction (i.e., a three-petal structure);

[0113] A limiting device 5-2 is provided above one of the buckle flaps (not fixedly connected);

[0114] The outer surface of the snap flap of the conical snap 5-3 contacts the inner surface of the conical wedge block 5-4, and the snap flap of the conical snap 5-3 can move up and down along the inner surface of the central through hole of the wedge block 5-4; that is, the three snap flaps (i.e., the three-flap structure) are slidably connected to the inner side wall of the central through hole of the conical wedge block 5-4. Therefore, as the snap flaps move up and down in the central through hole of the conical wedge block 5-4, the three snap flaps can separate and merge with each other (for example, when in the lower position of the central through hole of the conical wedge block 5-4, the three snap flaps contact and merge with each other, while when in the upper position of the central through hole of the conical wedge block 5-4, the three snap flaps separate and are separated).

[0115] In addition, the inner side of the tapered buckle 5 - 3 has a thread that can engage with the outer side thread of the screw rod of the bolt 4 .

[0116] During operation, when the tower 2 drives the bolt 4 upward, the bolt 4 pushes the conical buckle 5-3 upward along the tapered side surface of the central through hole of the wedge block 5-4. During this upward movement, the three buckle petals of the conical buckle 5-3 (i.e., the three-petal structure) separate from each other, thereby creating an opening in the middle of the conical buckle 5-3, allowing the bolt 4 to continue to move upward through the middle opening of the conical buckle 5-3. When the bolt 4 moves slightly downward, the outer thread of the bolt 4 screw engages with the inner thread of the conical buckle 5-3, driving the three buckle petals of the conical buckle 5-3 (i.e., the three-petal structure) downward along the inner side wall (i.e., the tapered side surface) of the central through hole of the conical wedge block 5-4. At this time, under the restraining effect of the tapered side surface, the three buckle petals (i.e., the three-petal structure) tighten and close together. As the downward load increases, the three buckle petals (i.e., the three-petal structure) close more tightly.

[0117] In specific implementation, the center points of the central through hole of the tapered wedge block 5-4, the second flange bolt hole 2-20 on the bottom flange 2-2 of the second tower section and the first flange bolt hole 1-20 on the top flange 1-2 of the first tower section are located on the same central axis.

[0118] In a specific implementation, the outer sleeve 5-1 is a steel outer sleeve.

[0119] In a specific implementation, the self-locking connecting device 5 further comprises a limiting buckle 5-7.

[0120] In the initial state (i.e., the screw rod of the bolt 4 is not located inside the conical buckle 5-3, i.e., the tower drum has not been lifted to the predetermined position), one side of the limiting buckle 5-7 is in contact with the inside of the limiting device 5-2, and the other side is in abutment with the plug 5-5 (i.e., under the elastic force of the spring, the limiting buckle 5-7 is in abutment contact with the plug 5-5).

[0121] It should be noted that in the initial state (i.e., the screw rod of the bolt 4 is not located inside the conical buckle 5-3), the limiting buckle 5-7 is located inside the limiting device 5-2, and the side wall thereof is in close contact with the plug 5-5, so that under the action of the spring device 5-6, the limiting buckle 5-7 limits the movement of the plug 5-5, preventing it from being ejected in advance.

[0122] It should be noted that for the present application, the self-locking connecting device 5 is fixedly installed at the top of the first section tower drum 1. When the second section tower drum 2 drives the bolt 4 to be lifted to the predetermined position, the self-locking connecting device 5 will automatically clamp and lock the bolt 4, thereby realizing the self-locking connection of the first section tower drum 1 and the second section tower drum 2.

[0123] In a specific implementation: when the second section tower drum 2 drives the bolt 4 to move upward, the plug 5-5 passes through the limiting bolt hole 4-2 and is inserted into the limiting slot 5-20 of the limiting device 5-2 when the limiting bolt hole 4-2 is just lifted to the plug 5-5.

[0124] It should be noted that by performing the plug locking operation, the stable connection of the bolt 4 and the self-locking connecting device 5 is realized, and by performing the conical buckle locking operation, the self-locking connecting device 5 reliably clamps the bolt 4, and the specific process is as follows:

[0125] When the second section tower drum 2 drives the bolt 4 to move upward, the top of the bolt gradually lifts the limiting buckle 5-7 upward, so that the limiting buckle 5-7 moves upward; after the side wall of the limiting buckle 5-7 completely separates from the plug 5-5, the plug 5-5 can be quickly ejected and inserted into the limiting bolt hole 4-2 at the upper part of the bolt 4 under the pushing of the spring 5-62, and after passing through the limiting bolt hole 4-2, it is inserted into the limiting slot 5-20 of the limiting device 5-2, thereby realizing the stable connection of the bolt 4 and the self-locking connecting device 5.

[0126] When the second tower section 2 is lifted to the pre-designed height position and the bolt 4 is firmly connected with the self-locking connecting device 5, the lifting driving device 10 reversely moves to make the second tower section 2 move downward by a preset distance (for example, a small distance of a preset length), and the second tower section 2 drives the bolt 4 to move downward synchronously; since the bolt 4 is firmly combined with the bolt 5-5, the downward movement force of the bolt 4 is transmitted to the top surface of the conical buckle 5-3 through the bolt 5-5; under the action of the downward pressure, the conical buckle 5-3 is inwards contracted along the inclined surface inside the wedge block 5-4, and the greater the downward pressure is, the tighter the conical buckle is contracted, so that the inner thread of the conical buckle 5-3 and the bolt thread 4-1 (that is, the outer thread) on the screw surface of the bolt 4 are in stronger meshing, so that the self-locking connecting device 5 reliably holds the bolt 4.

[0127] In the present application, the telescopic bracket 3 is specifically implemented as follows:

[0128] The two fixed inclined braces 3-2 are arranged in parallel and are hingedly (that is, rotatably) connected with the two ends of the telescopic platform 3-3.

[0129] The fixed inclined brace 3-2 is welded on the inner side of the first tower section 1-1.

[0130] The lower end of the telescopic platform 3-3 is hingedly connected with the lower end of the fixed inclined brace 3-2 through the anchoring bolt 3-1.

[0131] The flange of the fixed inclined brace 3-2 is provided with the first barb 3-20 which is inwardly buckled.

[0132] The flanges of the telescopic platform 3-3 are provided with the second barbs 3-30 which are outwardly buckled.

[0133] The first barb 3-20 and the second barb 3-30 are engaged through the clockwise rotation of the telescopic platform 3-3.

[0134] It should be noted that the anchoring bolt 3-1 is used to connect the fixed inclined brace 3-2 and the telescopic platform 3-3 into one body and serves as the rotating shaft of the platform; the fixed inclined brace 3-2 is welded on the inner wall of the first tower section 1-1, and the flange thereof is provided with the first barb 3-20 which is inwardly buckled.

[0135] It should be noted that the telescopic platform 3-3 is freely rotatable around the anchoring peg 3-1, and the flanges on both sides are provided with outwardly extending second barbs 3-30. During the lifting of the second section tower tube 2, the second section tower tube 2 will cause the telescopic platform 3-3 to rotate counterclockwise around the shaft, and the barbs on both sides will separate, and the telescopic bracket 3 will shrink, leaving space for the smooth lifting of the second section tower tube 2. After the second section tower tube 2 is lifted to the predetermined position, the telescopic platform 3-3 rotates clockwise under the action of gravity, so that the inner and outer barbs (the first barb 3-20 and the second barb 3-30) are engaged, and the bracket is stretched. At this time, the second section tower tube bottom flange 2-2 of the second section tower tube 2 is stably seated on the top surface of the telescopic platform 3-3, and the engaged state of the barbs can withstand and transmit the entire vertical load at the bottom of the tower tube 2, thereby achieving reliable vertical support (i.e., vertical support).

[0136] Based on the self-locking connection structure of the self-lifting tower tube provided by the present application, the present application further provides an implementation method of the self-locking connection structure of the self-lifting tower tube, comprising the following steps:

[0137] Step S1, transport the first section tower tube 1 and the second section tower tube 2 to the pre-required installation destination (i.e., the seabed where the offshore tower tube serving as the offshore wind power foundation needs to be installed); the top outer side of the first section tower tube 1 is provided with a centralizing support frame 11, and the top of the centralizing support frame 11 is provided with a lifting driving device 10;

[0138] In specific implementation, the first section tower tube 1 and the second section tower tube 2 can be transported to the pre-required installation destination in various ways.

[0139] For example, step S1 can be: transporting the first section tower tube 1 and the second section tower tube 2 to the pre-required installation destination by performing a floating operation: see Figure 1 , placing the second section tower tube 2 in the first section tower tube 1, and placing the two tower tubes on the floating installation ship 9, and then floating the two tower tubes to the pre-required installation destination (i.e., the seabed where the offshore tower tube serving as the offshore wind power foundation needs to be installed) by the floating installation ship 9;

[0140] In specific implementation, see Figure 1 , Figure 2 , the lower outer side of the first section tower tube 1 is provided with a jacket support structure 13;

[0141] The first section tower tube 1 is located inside the jacket support structure 13;

[0142] The lower end of the jacket support structure 13 has a plurality of cylinder foundations 14;

[0143] During the floating process, the cylinder foundation 14 of the jacket support structure 13 is arranged at the bottom of the floating installation ship 9, and during the floating process, the cylinder foundation 14 can be filled with gas to provide a certain buoyancy to ensure the smooth floating of the ship body.

[0144] The outer side of the first section tower drum 1 is provided with a centralizing support frame 11, and the top of the centralizing support frame 1 is adjacent to the top of the first section tower drum 1; the bottom of the centralizing support frame 11 can be arranged on the top of the floating installation ship 9;

[0145] The first section tower drum 1 is located at the inner side of the centralizing support frame 11;

[0146] The top of the centralizing support frame 11 is provided with a lifting driving device 10; the lifting driving device 10 is used for applying an upward lifting force to the second section tower drum 2, or driving the second section tower drum 2 to move downward;

[0147] The top of the second section tower drum 2 is provided with a machine head 12 (i.e. a wind turbine set);

[0148] Step S2: at the pre-required installation destination, the lifting and self-locking operation of the tower drum is performed: the second section tower drum 2 is surrounded by the lifting driving device 10 and an upward lifting force is applied, and under the action of the lifting driving device 10, the second tower drum 2 is gradually pulled out of the first section tower drum 1 and smoothly rises along the vertical direction;

[0149] When the second section tower drum 2 is lifted to the pre-designed height, the two section tower drums are automatically locked and fixed through the inter-cylinder section connecting structure A, so that the two section tower drums are safely and reliably in place.

[0150] It should be noted that, in fact, the self-locking connecting structure of the self-lifting tower drum of the present application includes three parts of structure, in addition to the first section tower drum 1 and the second section tower drum 2 shown in the figure. On the outer side of the first section tower drum 1, a jacket support structure 13 (which is a common structure form of offshore wind power support structure) is also nested. Before step S2 and after step S1, the jacket support structure 13 is first sunk to the seabed, and the cylinder foundation 14 of the jacket support structure 13 is firmly installed in the seabed foundation. Then, the top of the jacket support structure 13 is firmly connected with the bottom of the first section tower drum 1 on the ship body, and then step S2 is started. Since the present application mainly relates to the connecting mode between the first section tower drum 1 and the second section tower drum 2, the sinking scheme of the jacket (i.e. the jacket support structure 13) and the connecting mode between the jacket and the first section tower drum 1 are not discussed, and the main focus is on the connecting mode between the first section tower drum 1 and the second section tower drum 2.

[0151] It should be noted that, referring to Figure 1Fig. 1 is a schematic diagram of the overall structure of the self-lifting tower before lifting according to the present application. At this time, the second tower section 2 is completely retracted inside the first tower section 1, and the first tower section 1 is retracted inside the jacket support structure 13. The two tower sections are integrated with the floating installation vessel 9 and are floated to the target sea area. After positioning, the sinking preparation is carried out. When reaching the predetermined installation sea area, after the sinking installation of the jacket support structure 13 is completed, the lifting drive device 10 (for example, a hydraulic cylinder) first embraces the second tower section 2 and applies an upward lifting force. Under the action of the lifting drive device 10, the second tower section 2 is gradually pulled out of the first tower section 1 and smoothly rises in the vertical direction; when the second tower section 2 is lifted to the designed height, the two tower sections are automatically locked and fixed through the inter-tower-section connection structure A, realizing the safe and reliable positioning of the tower. This self-locking connection method not only simplifies the installation process, but also greatly improves the overall installation efficiency and construction safety. Figure 2 、 Figure 3 and Figure 4 The lifting drive device 10 (for example, a hydraulic cylinder) first embraces the second tower section 2 and applies an upward lifting force. Under the action of the lifting drive device 10, the second tower section 2 is gradually pulled out of the first tower section 1 and smoothly rises in the vertical direction; when the second tower section 2 is lifted to the designed height, the two tower sections are automatically locked and fixed through the inter-tower-section connection structure A, realizing the safe and reliable positioning of the tower. This self-locking connection method not only simplifies the installation process, but also greatly improves the overall installation efficiency and construction safety.

[0152] It should be noted that the lifting drive device 10 (for example, a hydraulic cylinder) can directly use the common lifting drive device in the existing conventional self-lifting tower technology to drive the connected second tower section 2 to move up and down; the lifting drive device is a conventional design known in the wind power technology field, which will not be described here.

[0153] In the present application, in the step S2, the lifting and self-locking operation of the tower is performed, which specifically includes the following operations:

[0154] The initial lifting operation of the first stage (see Figure 5 ): under the driving of the lifting drive device 10, the second tower section 2 is slowly lifted upward along the inner wall of the first tower section 1; when the second tower section bottom flange 2-2 rises to meet the telescopic platform 3-3 of the telescopic bracket 3, the outer side wall of the second tower section bottom flange 2-2 comes into contact with the side wall of the telescopic platform 3-3, and as the second tower section bottom flange 2-2 continues to move upward, the telescopic platform 3-3 is rotated counterclockwise around the anchoring bolt 3-1 to the inner side of the first tower section 1 under the push of the outer side wall of the second tower section bottom flange 2-2, thereby realizing the contraction of the telescopic bracket 3, effectively avoiding the lifting path of the second tower section bottom flange 2-2, and realizing the smooth lifting of the second tower section 2;

[0155] At the same time, the bolt 4 also rises with the second tower section 2 and gradually inserts into the first flange bolt hole 1-20 on the first tower section top flange 1-2;

[0156] The second stage of the bolt through the conical buckle operation (see Figure 6):In the continuous driving of the lifting driving device 10, the bolt 4 continues to move upward, and when the bolt 4 is lifted to the inside of the self-locking connecting device 5, as the bolt 4 moves upward, the tapered buckle 5-3 is forced to move upward along the inside wall (tapered side) of the center through hole of the wedge block 5-4, so that the three buckle petals (i.e. three-petal structure) included in the tapered buckle 5-3 are separated from each other to form an opening, and the bolt 4 continues to move upward through the opening (i.e. middle hole, also known as gap) between the three buckle petals (i.e. three-petal structure) included in the tapered buckle 5-3.

[0157] The third stage of the latch locking operation (see Figure 7 ):As the bolt 4 continues to lift upward, the top of the bolt gradually lifts the limiting buckle 5-7, so that the limiting buckle 5-7 moves upward; after the side wall of the limiting buckle 5-7 is completely separated from the latch 5-5, the latch 5-5 can be quickly ejected and inserted into the limiting bolt hole 4-2 on the upper part of the bolt 4 under the pushing of the spring 5-62, and then the latch 5-5 is inserted into the limiting groove 5-20 of the limiting device 5-2 after passing through the limiting bolt hole 4-2, thereby realizing the stable connection between the bolt 4 and the self-locking connecting device 5.

[0158] At the same time, the top surface of the second section tower drum bottom flange 2-2 is tightly attached to the bottom surface (i.e. the joint surface) of the first section tower drum top flange 1-2, reaching the upper limit position of the lifting, and at this time, since the second section tower drum bottom flange 2-2 no longer laterally restricts the telescopic platform 3-3, the telescopic platform 3-3 rotates clockwise around the anchoring peg 3-1 under the action of gravity, and can be automatically stretched out.

[0159] It should be noted that in the initial state, the limiting buckle 5-7 is located inside the limiting device 5-2, and the side wall thereof is tightly attached to the latch 5-5, thereby limiting the movement of the latch 5-5 and preventing it from being ejected in advance under the action of the spring 5-62 in the spring device 5-6.

[0160] The fourth stage of the tapered buckle locking operation (see Figure 8 ):When the second section tower drum 2 is lifted to the pre-designed height position, and the bolt 4 and the self-locking connecting device 5 complete the stable connection, the lifting driving device 10 reverses the movement to make the second section tower drum 2 move downward by a predetermined distance (e.g. a small distance of a predetermined length), and in the process of moving downward, the second section tower drum bottom flange 2-2 is smoothly seated on the top surface of the telescopic platform 3-3, fully exerting the load bearing effect of the corbel 3.

[0161] At the same time, the second section of the tower drum 2 is also moved down, and the bolt 4 is synchronously moved down; since the bolt 4 is firmly combined with the bolt 5-5, the downward movement of the bolt 4 is transmitted to the top surface of the conical buckle 5-3 through the bolt 5-5; under the action of the downward pressure, the conical buckle 5-3 will shrink inward along the inclined surface inside the wedge block 5-4, and the greater the downward pressure, the tighter the conical buckle shrinks, so that the inner thread of the conical buckle 5-3 and the bolt thread 4-1 (i.e. the outer thread) on the surface of the screw rod of the bolt 4 produce stronger meshing effect, so that the self-locking connection device 5 can reliably hold the bolt 4.

[0162] It should be noted that the inner thread of the conical buckle 5-3 and the bolt thread 4-1 (i.e. the outer thread) on the surface of the screw rod of the bolt 4 will produce strong meshing effect. At the same time, due to the conical design of the conical buckle 5-3 and the wedge block 5-4, even if the fan is running, when the first section of the tower drum 1 and the second section of the tower drum 2 have a tendency to separate due to bending moment, the meshing between the conical buckle 5-3 and the bolt 4 will be tighter, and the firm connection between the two sections of the tower drum will be maintained.

[0163] In the present application, the four-stage operation has completed the lifting of the tower drum and the self-locking operation, and the tower drum lifting process has been completed.

[0164] In the present application, specifically, after the conical buckle locking operation in the fourth stage, the following operations are further included:

[0165] Referring to Figure 9 , Figure 10 , the fifth stage of the anti-bending pin 6 insertion operation: the first installation hole and the second installation hole for the anti-bending pin 6 are reserved on the side surface of the first section of the tower drum 1-1 and the bottom flange 2-2 of the second section of the tower drum, and when the second section of the tower drum 2 is lifted, the anti-bending pin 6 is transversely inserted through the first installation hole on the first section of the tower drum 1-1 and the second installation hole on the bottom flange 2-2 of the second section of the tower drum, achieving insertion and fixation, and further increasing the carrying capacity of the connection part. When the connection node bears a large bending moment load, the anti-bending pin 6 provides additional bending support for the node through its shear resistance;

[0166] It should be noted that, referring to Figure 8As shown, for the offshore self-lifting tower after the completion of the fourth stage of the conical buckle locking operation, in view of the vertical connection gap 7 between the top flange 1-2 of the first section tower and the second section tower wall 2-1, and the horizontal connection gap 8 between the bottom surface of the first section tower top flange 1-2 and the top surface of the second section tower bottom flange 2-2, for this purpose, for the present application, in order to eliminate the gap (vertical connection gap 7 and horizontal connection gap 8) between the first section tower 1 and the second section tower 2 and enhance the integrity of the connection node. For the vertical connection gap 7 and the horizontal connection gap 8 existing in the offshore self-lifting tower after the completion of the fourth stage of the conical buckle locking operation, fill the vertical connection gap 7 and the horizontal connection gap 8 with grout.

[0167] It should be noted that for the present application, high-strength grout can be injected at the vertical connection gap 7 to fill the vertically connected vertical connection gap 7 and horizontal connection gap 8, thereby further enhancing the integrity of the connection node.

[0168] It should be noted that in the present application, the second section tower wall 2-1 does not need to be welded with steel plates. Because the grouting process has been carried out in the gap 7. The grouting process can be used to improve the buckling resistance of this part.

[0169] For the present application, the final effect of the complete connection node after the tower lifting is completed, see Figure 9 As shown.

[0170] In addition, when the self-lifting tower of the present application reaches the end of its service life and needs to be removed, the entire process is also simple and easy. First, manually pull out the anchor bolt 3-1 to remove the telescopic corbel 3. Then, the bolt 5-5 and the bending-resistant pin 6 are removed in sequence, and the self-locking connection structure between the two sections of the tower is completely released. Finally, the lifting drive device 10 is reversely moved downward, slowly lowering the second section tower to the predetermined position, and the removal operation is completed. This disassembly method effectively reduces the complexity and cost of the operation.

[0171] Compared with the prior art, the offshore self-lifting tower provided by the present application has the following beneficial effects:

[0172] 1. It is beneficial to improve the node strength and stress performance of the telescopic tower connection part. The present application adds multiple connection structure forms (such as multiple connection bolts 4, multiple self-locking connection devices 5, multiple telescopic corbels 3, and bending-resistant pins 6) at the tower connection part through innovative connection structure design, effectively enhancing the stress performance of the connection part, making the connection part better resist vertical load and wind load, and ensuring the safety of the tower during long-term operation.

[0173] 2、It is beneficial to automatic locking connection. The application utilizes the displacement in the tower lifting process to automatically activate the self-locking connection device 5, and the firm butt joint of the upper and lower tower can be realized without human intervention. The whole locking process is highly automated, which not only improves the operation efficiency, but also ensures the stability and reliability of the connection node.

[0174] 3、Innovative conical buckle structure. Through the ingenious sliding contraction cooperation between the wedge block and the conical buckle, the function of automatic hoop and locking of the bolt in the lifting process is realized. When the bolt moves downward to generate downward pressure, the conical buckle automatically shrinks along the inner inclined surface of the wedge block, so that the inner thread of the conical buckle is closely engaged with the outer thread of the bolt, ensuring more stable connection.

[0175] 4、The telescopic bracket scheme is innovatively designed. The telescopic bracket structure is designed in the application. During the tower lifting process, the bracket automatically shrinks to avoid the lifting path, ensuring the stable upward movement of the tower; when the tower is lifted to the predetermined position, the bracket naturally expands by gravity, providing additional vertical support for the upper tower, thereby improving the overall carrying capacity.

[0176] 5、Innovative design of efficient anti-disconnection measures. When the two tower sections are separated, the self-locking connection device will convert the load generated therefrom into downward pressure on the conical buckle, so that the conical buckle further shrinks along the inclined surface of the wedge block, achieving closer engagement. The greater the downward pressure, the tighter the engagement between the conical buckle and the bolt thread, thereby effectively avoiding the risk of disconnection during operation.

[0177] 6、Innovative design of safe and efficient disassembly process. The connection structure of the application is also simple and efficient when disassembled. First, pull out the anchor bolt and remove the telescopic bracket; then take out the bolt and the bending pin one by one, and the self-locking connection is released. Finally, use the reverse downward movement of the lifting drive device 10 to slowly lower the second tower section to the predetermined position. This process greatly reduces the disassembly complexity and cost, while ensuring the safety of the operation.

[0178] 7、Meet the needs of larger units and complex environment. With the continuous increase of wind turbine capacity and the increasing complexity of offshore environment, the connection structure of the application not only can support higher towers and larger loads, but also optimizes the fatigue resistance and bending performance in design, ensuring the reliability and durability of the system in severe sea conditions, providing a solid technical guarantee for future large-scale and deep-sea wind power projects.

[0179] The above is only the preferred embodiment of the application. It should be noted that for those skilled in the art, without departing from the principles of the application, several improvements and refinements can be made, which should also be considered within the scope of protection of the application.

Claims

1. A self-locking connection structure for an offshore self-lifting tower, characterized in that: It comprises a first tower section (1), a second tower section (2) and an inter-section connection structure A; The second tower section (2) is located in the inner side of the first tower section (1); The first tower section (1) and the second tower section (2) are connected via an inter-section connection structure A; The inter-section connection structure A comprises a first section tower top flange (1-2), a second section tower bottom flange (2-2), a retractable bracket (3), a plurality of bolts (4), a self-locking connection device (5) and an anti-bending pin (6); The first tower section (1) includes a first tower section wall (1-1); The annular first-section tower top flange (1-2) is circumferentially arranged on the top of the first-section tower wall (1-1) distributed circumferentially and protrudes inwards; The second tower section (2) includes a second tower section wall (2-1); The annular second-section tower bottom flange (2-2) is circumferentially arranged on the bottom of the second-section tower wall (2-1) distributed along the circumferential direction and protrudes outwards; The bottom flange (2-2) of the second tower section is located below the top flange (1-2) of the first tower section; A plurality of retractable brackets (3) are circumferentially and evenly arranged on the inner side of the first tower section wall (1-1), and are used to contact the bottom surface of the second tower section bottom flange (2-2) and support the second tower section bottom flange (2-2) upwards; A plurality of bolts (4) are used to vertically penetrate the bottom flange (2-2) of the second tower section and the top flange (1-2) of the first tower section and then be connected to correspondingly a plurality of self-locking connection devices (5); Each self-locking connection device (5) is used to achieve a fastened connection between the first tower section (1) and the second tower section (2) by automatically locking a corresponding bolt (4).

2. The self-locking connection structure of the offshore self-lifting tower according to claim 1, characterized in that: The inter-tube connection structure A further includes an anti-bending pin (6); The anti-bending pin (6) is used for horizontally penetrating through a first mounting hole on the wall (1-1) of the first tower section and a second mounting hole on the bottom flange (2-2) of the second tower section to achieve plug-in fixation.

3. The self-locking connection structure of the offshore self-lifting tower according to claim 1, characterized in that: The bolt (4) is used to vertically penetrate the bottom flange (2-2) of the second tower section and the top flange (1-2) of the first tower section and then connect with the self-locking connection device (5). The specific structural design is as follows: A plurality of second flange bolt holes (2-20) are vertically provided on the bottom flange (2-2) of the second tower section; The first section tower top flange (1-2) is provided with a first flange bolt hole (1-20) at a position corresponding to each second flange bolt hole (2-20); The nut of each bolt (4) is welded and fixed to the bottom of the bottom flange (2-2) of the second tower section; The screw rod of each bolt (4) passes through the second flange bolt hole (2-20) on the second tower section bottom flange (2-2) and the first flange bolt hole (1-20) on the first tower section top flange (1-2) in sequence from bottom to top, and is connected to the self-locking connection device (5); The self-locking connection device (5) is located on the top of the first tower section top flange (1-2).

4. The self-locking connection structure of the offshore self-lifting tower according to claim 1, characterized in that: Each self-locking connection device (5) comprises: an outer sleeve (5-1), a limiting device (5-2), a tapered buckle (5-3), a tapered wedge block (5-4) and a latch (5-5); Conical wedge blocks (5-4) are arranged in a surrounding manner inside the hollow outer sleeve (5-1); The conical wedge block (5-4) is fixedly arranged on the top of the first tower section top flange (1-2); The tapered wedge block (5-4) is arranged corresponding to the bolt (4); The inner side wall of the central through hole of the tapered wedge block (5-4) is fitted with the circumferential outer surface of the tapered buckle (5-3); The inner side of the tapered buckle (5-3) is used to accommodate the screw rod of the bolt (4); The inner side of the tapered buckle (5-3) has a thread for engaging with the outer side thread of the screw rod of the bolt (4); A limiting device (5-2) is provided above the conical buckle (5-3); One end of the transversely distributed limiting device (5-2) is slidably arranged on an inner wall of one side of the outer sleeve (5-1); The inner side of the limiting device (5-2) is provided with horizontally distributed limiting grooves (5-20); An elastically retractable latch (5-5) is provided on the inner wall of the outer sleeve (5-1) on a side away from the limiting groove (5-20); The latch (5-5) is used to insert into the limiting groove (5-20) of the limiting device (5-2) after being inserted into the limiting bolt hole (4-2) on the bolt (4).

5. The self-locking connection structure of the offshore self-lifting tower according to claim 4, characterized in that: The upper portion of the bolt (4) is provided with a limit bolt hole (4-2) which is horizontally penetrated; The limiting bolt hole (4-2) is arranged correspondingly to the latch pin (5-5) in the self-locking connection device (5); The shape and size of the limiting bolt hole (4-2) correspond to the shape and size of the latch (5-5) in the self-locking connection device (5); The central axis of the limiting bolt hole (4-2) and the central axis of the latch pin (5-5) in the self-locking connection device (5) are both horizontally distributed and located on the same vertical plane; and / or, The central through hole of the tapered wedge block (5-4) is a through hole in the shape of a truncated cone; The conical buckle (5-3) is connected in a sliding manner with the inner side wall of the central through hole of the conical wedge block (5-4); and / or, The latch (5-5) is connected to the inner wall of the outer sleeve (5-1) via a spring device (5-6); The spring device (5-6) is slidably arranged on the inner wall of the outer sleeve (5-1); The spring device (5-6) includes a spring assembly housing (5-61) and a spring (5-62); The spring assembly housing (5-61) is horizontally distributed and has an opening on one side facing the limiting groove (5-20); One end of a spiral spring (5-62) is provided on a side of the spring assembly housing (5-61) away from the limiting groove (5-20); The other end of the spring (5-62) is connected to the outer end of the latch (5-5) away from the limiting groove (5-20); and / or, The center points of the central through hole of the tapered wedge block (5-4), the second flange bolt hole (2-20) on the second tower section bottom flange (2-2), and the first flange bolt hole (1-20) on the first tower section top flange (1-2) are located on the same central axis; and / or, The conical buckle (5-3) comprises three buckle petals equally divided along the radial direction; A limiting device (5-2) is provided on the top of one of the buckle flaps; The outer surface of the buckle flap of the conical buckle (5-3) contacts the inner surface of the conical wedge block (5-4), and the buckle flap of the conical buckle (5-3) can move up and down along the inner surface of the central through hole of the wedge block (5-4); and / or, The self-locking connection device (5) also includes a limiting buckle (5-7); In the initial state, one side of the limiting buckle (5-7) contacts the inner side of the limiting device (5-2), and the other side abuts against the latch (5-5).

6. The self-locking connection structure of the offshore self-lifting tower according to claim 1, characterized in that: The retractable corbel (3) comprises a fixed diagonal brace (3-2) and a retractable platform (3-3); Two fixed diagonal supports (3-2) are arranged in parallel and are hinged to both ends of the telescopic platform (3-3); The fixed diagonal brace (3-2) is welded and arranged on the inner side of the first section tower wall (1-1).

7. The self-locking connection structure of the offshore self-lifting tower according to claim 6, characterized in that: The lower end of the telescopic platform (3-3) is hinged to the lower end of the fixed diagonal brace (3-2) via an anchor bolt (3-1); A first inwardly buckled hook (3-20) is provided on the flange of the fixed diagonal brace (3-2); Second barbs (3-30) extending outwards are provided on both sides of the flange of the telescopic platform (3-3); By rotating the telescopic platform (3-3) clockwise, the first barb (3-20) and the second barb (3-30) are engaged.

8. A method for implementing the self-locking connection structure of an offshore self-lifting tower according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, transporting the first tower section (1) and the second tower section (2) to a pre-required installation destination; a centralizing support frame (11) is provided on the outer side of the top of the first tower section (1), and a lifting drive device (10) is provided on the top of the centralizing support frame (11); Step S2, performing the tower lifting and self-locking operation at the pre-required installation destination: the lifting drive device (10) embraces the second tower section (2) and applies an upward lifting force, and under the action of the lifting drive device (10), the second tower section (2) is gradually drawn upward from the first tower section (1) and rises steadily in the vertical direction; When the second tower section (2) is lifted to a pre-designed height, the two tower sections are automatically locked and fixed through the inter-section connection structure A, thereby achieving safe and reliable positioning of the two tower sections.

9. The method for implementing the self-locking connection structure of the offshore self-lifting tower according to claim 8, characterized in that: In step S2, the tower lifting and self-locking operations are performed, specifically including the following operations: Initial lifting operation of the first stage: driven by the lifting drive device (10), the second tower section (2) is slowly lifted upward along the inner wall of the first tower section (1); when the bottom flange (2-2) of the second tower section is lifted to meet the telescopic platform (3-3) of the telescopic bracket (3), the outer wall of the bottom flange (2-2) of the second tower section comes into contact with the side wall of the telescopic platform (3-3); as the bottom flange (2-2) of the second tower section continues to move upward, the telescopic platform (3-3) rotates counterclockwise around the anchor bolt (3-1) toward the inside of the first tower section (1) under the push of the outer wall of the bottom flange (2-2) of the second tower section, thereby achieving the contraction of the telescopic bracket (3), effectively avoiding the lifting path of the bottom flange (2-2) of the second tower section, and achieving the smooth lifting of the second tower section (2); At the same time, the bolt (4) also rises along with the second tower section (2) and is gradually inserted into the first flange bolt hole (1-20) on the top flange (1-2) of the first tower section; In the second stage, the bolt is operated by the conical buckle: under the continuous driving of the lifting drive device (10), the bolt (4) continues to move upward. When the bolt (4) is lifted to the inside of the self-locking connection device (5), as the bolt (4) moves upward, the conical buckle (5-3) is forced to move upward along the inner side wall of the central through hole of the wedge block (5-4), so that the three buckle petals included in the conical buckle (5-3) are separated from each other and an opening is formed between them. The bolt (4) continues to move upward through the opening between the multiple conical buckles (5-3); The third stage of the latch locking operation: as the bolt (4) continues to be lifted upward, the top of the bolt gradually pushes up the limit buckle (5-7), causing the limit buckle (5-7) to move upward; after the side wall of the limit buckle (5-7) is completely separated from the latch (5-5), the latch (5-5) can be quickly ejected and inserted into the limit bolt hole (4-2) on the upper part of the bolt (4) under the push of the spring (5-62), and then the latch (5-5) is inserted into the limit groove (5-20) of the limit device (5-2) after passing through the limit bolt hole (4-2), thereby achieving a stable connection between the bolt (4) and the self-locking connection device (5); At the same time, the top surface of the bottom flange (2-2) of the second tower section is tightly fitted with the bottom surface of the top flange (1-2) of the first tower section, reaching the upper limit of the lifting position. At this time, since the bottom flange (2-2) of the second tower section no longer exerts lateral constraints on the telescopic platform (3-3), the telescopic platform (3-3) rotates clockwise around the anchor bolt (3-1) under the action of its own weight and can be automatically extended. The fourth stage of the conical buckle locking operation: when the second tower section (2) is lifted to a pre-designed height position and the bolt (4) is firmly connected to the self-locking connection device (5), the lifting drive device (10) moves in the reverse direction, so that the second tower section (2) moves downward by a preset distance. During the downward movement, the bottom flange (2-2) of the second tower section smoothly seats on the top surface of the retractable platform (3-3), giving full play to the bearing function of the bracket (3); At the same time, the downward movement of the second tower section (2) also drives the bolt (4) to move downward synchronously; since the bolt (4) and the latch (5-5) are firmly combined, the downward movement force of the bolt (4) is transmitted to the top surface of the conical buckle (5-3) through the latch (5-5); under the action of downward pressure, the conical buckle (5-3) will shrink inward along the inclined surface on the inner side of the wedge block (5-4), and the greater the downward pressure, the tighter the conical buckle shrinks, thereby generating a stronger meshing effect between the inner thread of the conical buckle (5-3) and the bolt thread (4-1) on the screw surface of the bolt (4).

10. The method for implementing the self-locking connection structure of the offshore self-lifting tower according to claim 9, characterized in that: After the fourth stage of the tapered snap-fit ​​locking operation, the following operations are also included: The fifth stage of the anti-bending pin (6) insertion operation: a first mounting hole and a second mounting hole for the anti-bending pin (6) are reserved on the side of the first section tower wall (1-1) and the second section tower bottom flange (2-2); when the second section tower (2) is lifted, the anti-bending pin (6) is inserted transversely through the first mounting hole on the first section tower wall (1-1) and the second mounting hole on the second section tower bottom flange (2-2) to achieve plug-in fixation; Furthermore, after the fourth stage of the conical buckle locking operation is completed, grout is poured into the vertical connection gap (7) and the horizontal connection gap (8) existing in the offshore self-lifting tower.

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