A tower structure and construction method thereof

Abstract

The present invention relates to the technical field of offshore wind power foundations, and in particular to a tower structure and a construction method thereof, which comprises a first tower and a second tower, wherein a driving motor is arranged in the first tower, and the driving motor is connected to a first lifting rod and a second lifting rod pointing vertically downward, and the bottom of the first lifting rod is connected to a limiting circular plate, and a plurality of positioning holes corresponding to a plurality of bolt connectors are arranged circumferentially on the limiting circular plate, and a traction rope is passed through the positioning hole, and the upper end of the traction rope is fixedly connected to the second lifting rod, and the lower end of the traction rope is movably connected to the second tower through a fixing assembly. The present invention aligns the peripheral walls of the first tower and the second tower longitudinally through the cooperation of the limiting circular plate and a plurality of traction ropes, and brings the first tower and the second tower closer through the movement of the crane and the tightening of the traction rope by the second lifting rod, thereby achieving the effect of rapid positioning; at the same time, it can prevent the movement of the crane and wind and waves from causing the first tower to shake, thereby shortening the assembly time.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power foundations, and in particular to a tower structure and a construction method thereof. Background Art

[0002] With the rapid development of the new energy industry, offshore wind power equipment has become a mature green energy industry with its advantages of abundant wind resources, no occupation of land resources, and higher power generation efficiency. The installation of existing offshore wind power equipment is carried out by transporting and installing ships to transport the foundation piles, multiple towers, main engines and impellers to the installation site. Through the lifting system on the transport ship, the four support legs are inserted downward into the seabed, and the hull is raised above the sea surface. With the help of the crane on the transport and installation ship, the foundation piles, multiple towers, main engines and impellers are hoisted separately, which can avoid the impact of waves on the hull, thereby improving alignment and assembly efficiency. Finally, the installation of offshore wind power equipment is completed by segmented hoisting and bolting.

[0003] Compared with the construction of onshore wind power equipment, the construction of offshore wind power equipment faces a more complex and harsh offshore environment. Offshore construction is difficult and the operation window is short, which greatly increases the cost and construction period of offshore wind power construction. Although lifting the hull can greatly increase the stability of the crane during operation, in actual operation it still takes several hours of alignment and manual assisted traction to complete the alignment. This method is not only time-consuming and labor-intensive, but also increases labor costs. It will also increase the difficulty of offshore construction when encountering sudden severe weather. Therefore, improving assembly efficiency and construction methods is a development trend of offshore wind power and a technical research that needs to be solved urgently. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a tower structure and a construction method thereof.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A tower structure comprises a first tower barrel and a second tower barrel with the same structure, wherein the first tower barrel is located above the second tower barrel, and the first tower barrel and the second tower barrel are connected by a plurality of circumferentially arranged bolt connectors, a driving motor is arranged in the first tower barrel, and the driving motor is connected to a vertically downward lifting mechanism, and the lifting mechanism comprises a first lifting rod and a second lifting rod which are independently controlled from each other, the bottom of the first lifting rod is connected to a limiting circular plate, the diameter of the limiting circular plate is equal to the inner diameter of the first tower barrel, the second lifting rod is sleeved on the first lifting rod, and a plurality of positioning holes corresponding to the plurality of bolt connectors are arranged circumferentially on the limiting circular plate, and a traction rope is passed through the positioning hole, the upper end of the traction rope is fixedly connected to the second lifting rod, and the lower end of the traction rope is movably connected to the second tower barrel through a fixing assembly.

[0007] Furthermore, the maximum lifting height of the limiting circular plate is not lower than the horizontal height corresponding to the bottom of the first tower. When the limiting circular plate is lifted to the height of the bottom of the first tower, it is used as a positioning reference for the alignment of the first tower and the second tower. When the limiting circular plate enters the interior of the first tower under the traction of the first lifting rod, several positioning holes are evenly distributed on the bottom circumference of the first tower. At this time, the traction force of the traction rope can be evenly distributed on the outer ring of the limiting circular plate. When the limiting circular plate remains stationary and the second lifting rod rises, the positioning effect of the limiting circular plate can align the outer walls of the first tower and the second tower, thereby ensuring that the axes of the first tower and the second tower are aligned, which facilitates subsequent bolt connection after rapid alignment. The limiting circular plate can avoid excessive local force caused by uneven distribution of traction force and improve the safety of the structure.

[0008] Furthermore, the fixing assembly includes several hooks corresponding to the traction ropes and several fixing rings, the hooks are fixedly connected to the bottom of the traction ropes, the fixing rings are arranged on the top inner wall of the second tower, and the several fixing rings correspond vertically to several bolt connectors one by one. When the first tower is moved to the top of the second tower in preparation for connection and fixing, the traction rope plays a guiding and quick alignment function. In the process of the crane continuously lowering the first tower, the second lifting rod is continuously lifted upward, and the lifting rate of the second lifting rod is the same as the lowering rate of the crane, ensuring that the traction rope is always kept in a straightened state, so that the position of each fixing ring is on the same vertical line as the corresponding bolt connector, thereby achieving a stable guiding effect.

[0009] Furthermore, a construction platform is provided at the upper end of the inner cavity of the second tower, and a construction and maintenance passage for operators to enter and exit is also provided on the second tower. The bottom of the first tower adopts an internal fixed assembly structure. After the first tower and the second tower are aligned and placed, the operator fixes and installs the bolt connectors of the first tower and the second tower inside the second tower to achieve a fixing effect. The construction platform provides a safe and stable platform for construction personnel, so that installation operations can be carried out more safely and efficiently during offshore construction operations. The construction and maintenance passage allows operators to enter the interior of the tower to perform various installation and maintenance operations.

[0010] Furthermore, the construction platform can be movably arranged in the second tower through the suspension assembly. The construction platform can be lifted by the lifting mechanism following the installation node. During the installation of the multi-section tower, the movable setting can be adjusted and moved in the multi-section tower according to the construction needs, providing a high degree of flexibility. The construction platform can adapt to different construction tasks and changes in the internal structure of the tower, improve construction efficiency, reduce the space occupied inside the tower, and also facilitate the subsequent movement of the inspection and maintenance work inside the tower, so that construction personnel can reach the area that needs inspection or maintenance.

[0011] Furthermore, the drive motor can be movably assembled in the first tower, and a temporary mounting frame for fixing the drive motor is provided in the first tower. When installing any two adjacent towers, the upper tower is the first tower, and the lower tower is the second tower. Before installing the first tower on the second tower, the drive motor is installed above the interior of the first tower, and the drive motor is fixed by a temporary mounting frame. When the first tower is moved to the top of the second tower by a crane, the first tower and the second tower are connected by a traction rope, and the drive motor is connected to the lifting mechanism. The alignment and installation of the first tower and the second tower are completed by controlling the drive motor to drive the lifting mechanism. After the fixation is completed, a new tower needs to be installed above the first tower. At this time, the original first tower becomes the second tower, and the newly added tower becomes the first tower, and then the installation operation continues. Before the installation work is carried out, the traction part of the crane needs to be connected to the drive motor, the temporary mounting frame fixing the drive motor is released, and the drive motor is suspended and moved to the newly added tower, and fixed by the temporary mounting frame in the newly added tower to facilitate the next round of installation work.

[0012] Furthermore, the positioning hole is located on the outer circumference of the limiting circular plate, and an arc-guiding structure is provided on the inner wall of the positioning hole. Several traction ropes are provided on the outer circumference of the limiting circular plate, and the uniform distribution of tension is conducive to maintaining a stable state of the first tower, reducing the shaking of the first tower, and thus improving the stability effect during installation. During the traction process of the second lifting rod, the lower end of the traction rope is in a vertical state, and the upper end is subjected to force in the direction of the second lifting rod. At this time, the traction rope is subjected to centripetal force at the limiting circular plate. The continuous lifting process will cause friction between the traction rope and the limiting circular plate. Providing an arc surface structure on the inner wall of the positioning hole can reduce friction and reduce work consumption.

[0013] A construction method for a tower structure comprises the following steps:

[0014] S1: Hoisting operation: the first tower is hoisted and lifted by the crane on the transport and installation ship, and moved to the top of the second tower that has been assembled and fixed, and ready for assembly;

[0015] S2: traction connection, connecting and fixing a plurality of hook cables to the fixing rings on the second tower tube or foundation pile below, and connecting a plurality of hook cables to a plurality of fixing rings in sequence;

[0016] S3: Traction guide and uniform traction force, start the first lifting rod, lift the limit plate into the first tower, and move the crane towards the second tower at the same time, so that the traction force of each hook rope is evenly distributed on the outer ring of the limit plate;

[0017] S4: Alignment and assembly. When the crane pulls the first tower tube toward the second tower tube, the second lifting rod is started. At this time, the limit plate remains stationary and the second lifting rod rises. At this time, the first tower tube can be guided toward the second tower tube, and the axes of the first tower tube and the second tower tube are aligned until several bolt connectors on the first tower tube and the second tower tube correspond.

[0018] S5: After the first tower is connected and aligned with the second tower, the second lifting rod is stopped, and the first tower and the second tower are bolted together through the bolt connector to complete the connection and installation.

[0019] Furthermore, in step S2, foundation piles are arranged below the second tower, and bolt connectors cooperating with the bottom of the second tower are arranged circumferentially on the top of the foundation piles. The assembly sequence of the second tower and the foundation piles is the same as steps S2 to S5.

[0020] Furthermore, in steps S3 to S5, a control system for controlling the crane and the lifting mechanism is provided. In the process of controlling the crane to rotate and lift the first tower, the control system enables the lifting mechanism to automatically adjust according to feedback through the monitoring component.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention aligns the peripheral walls of the first tower and the second tower longitudinally through the cooperation of the limiting circular plate and a plurality of traction ropes, and brings the first tower and the second tower closer together through the movement of the crane and the tightening of the traction rope by the second lifting rod, thereby achieving the effect of rapid positioning;

[0023] 2. The present invention keeps the first tower in a vertical state by means of several traction ropes fixed on the second tower, thereby preventing the first tower from shaking due to the movement of the crane and wind and waves, eliminating the need for manual traction and shortening the assembly time;

[0024] 3. The present invention can not only save the auxiliary steps of manual traction and calibration, but also reduce the physical energy consumption and labor costs of construction personnel. In the face of sudden bad weather, normal construction can still be carried out, which greatly improves the assembly efficiency and construction progress of continuous installation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the present invention applied to a wind turbine;

[0026] Figure 2 It is a schematic diagram of the planar structure of the present invention;

[0027] Figure 3 It is a partial structural diagram of the lifting mechanism;

[0028] Figure 4It is a schematic diagram of the assembly of the lifting mechanism and the traction rope;

[0029] Figure 5 It is a flowchart of the construction steps of the present invention;

[0030] Figure identification: 1-first tower, 2-second tower, 3-bolt connector, 4-first lifting rod, 5-second lifting rod, 6-limiting circular plate, 7-positioning hole, 8-traction rope, 9-hook rope, 10-fixing ring, 11-construction platform, 12-foundation pile. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0032] Embodiment 1, as Figure 1-5 As shown, a tower structure disclosed in the present invention includes a first tower 1 and a second tower 2 with the same structure, the first tower 1 is located above the second tower 2, the first tower 1 and the second tower 2 are connected by a plurality of bolt connectors 3 arranged circumferentially, a driving motor is arranged in the first tower 1, the driving motor is connected to a vertical downward lifting mechanism, the lifting mechanism includes a first lifting rod 4 and a second lifting rod 5 which are independently controlled from each other, the bottom of the first lifting rod 4 is connected to a limiting circular plate 6, the diameter of the limiting circular plate 6 is equal to the inner diameter of the first tower 1, the second lifting rod 5 is sleeved on the first lifting rod 4, the limiting circular plate 6 is circumferentially arranged with a plurality of positioning holes 7 corresponding to the plurality of bolt connectors 3, a traction rope 8 is passed through the positioning hole 7, the upper end of the traction rope 8 is fixedly connected to the second lifting rod 5, and the lower end of the traction rope 8 is movably connected to the second tower 2 through a fixing assembly.

[0033] Specifically, the drive motor includes two independently operated screw lifts, which are respectively connected to the first lifting rod 4 and the second lifting rod 5. A controller and a wireless transmission unit are provided in the screw lift. After receiving the control instruction of the wireless transmission unit, the controller can control the first lifting rod 4 or the second lifting rod 5 to move vertically in the first tower 1. The screw lift is a conventional mechanical equipment, and the connection between its output shaft and the first lifting rod 4 or the second lifting rod 5 is a conventional technical means known to those skilled in the art, and the present application scheme is not drawn in the drawings.

[0034] The function of the traction rope is to align the outer walls of the first tower 1 and the second tower 2. The bolt connector 3 is only used to fix the first tower 1 and the second tower 2. The first tower 1 itself is equipped with bolts, which can be tightened after alignment. The limiting circular plate 6 is used to ensure that the second tower 2 is aligned below the first tower 1. If there is no limiting circular plate 6, any shaking or wind and waves will cause the second tower 2 to shake. After the limiting circular plate 6 is provided, the tension of each traction rope 8 will stabilize the second tower 2 below the first tower 1.

[0035] The second lifting rod 5 is sleeved on the first lifting rod 4, and they are independently controlled by the screw lifter. The sleeve connection ensures that the force point is located on the axis to improve the balance effect. When the first lifting rod 4 controlling the limit circular plate 6 stops, the second lifting rod 5 can move freely and is not affected by the first lifting rod 4.

[0036] The maximum lifting height of the limiting circular plate 6 is not lower than the horizontal height corresponding to the bottom of the first tower 1. Specifically, when the limiting circular plate 6 is lifted to the height of the bottom of the first tower 1, it can be used as a precise positioning reference to help align the first tower 1 and the second tower 2. When the limiting circular plate 6 enters the interior of the first tower 1 under the traction of the first lifting rod 4, several positioning holes 7 are evenly distributed on the bottom circumference of the first tower 1. At this time, the traction force of the traction rope 8 can be evenly distributed on the outer ring of the limiting circular plate 6. When the limiting circular plate 6 remains stationary and the second lifting rod 5 rises, the positioning effect of the limiting circular plate 6 can align the outer walls of the first tower 1 and the second tower 2, thereby ensuring that the axes of the first tower 1 and the second tower 2 are aligned, and facilitating subsequent bolt connection after rapid alignment. The limiting circular plate 6 can avoid excessive local force caused by uneven distribution of traction force, thereby improving the safety of the structure.

[0037] The fixing assembly includes several hooks 9 corresponding to the traction rope 8 and several fixing rings 10, wherein the hooks 9 are fixedly connected to the bottom of the traction rope 8, and the fixing ring 10 is arranged on the top inner wall of the second tower 2, and the fixing rings 10 correspond vertically to the bolt connectors 3 one by one. Specifically, when the first tower 1 is moved to the top of the second tower 2 for connection and fixing, the traction rope 8 plays the role of guiding and quick alignment. In the process of the crane continuously lowering the first tower 1, the second lifting rod 5 is continuously lifted upward, and the lifting rate of the second lifting rod 5 is the same as the lowering rate of the crane, so that the traction rope 8 is always kept in a straightened state, so that the position of each fixing ring 10 is on the same vertical line as the corresponding bolt connector 3, thereby achieving a stable guiding effect. Compared with the hoisting of the first tower 1 in a non-traction state, the present application scheme can avoid the shaking of the first tower 1 caused by waves or the movement of the crane itself, thereby improving the stability and efficiency of the installation process.

[0038] A construction platform 11 is provided at the upper end of the inner cavity of the second tower 2, and a construction and maintenance passage for operators to enter and exit is also provided on the second tower 2. Specifically, the bottom of the first tower 1 adopts an internal fixed assembly structure. After the first tower 1 and the second tower 2 are aligned and placed, the operator fixes and installs the bolt connectors 3 of the first tower 1 and the second tower 2 inside the second tower 2 to achieve a fixing effect. The construction platform 11 provides a safe and stable platform for construction personnel, so that installation operations can be carried out more safely and efficiently during offshore construction operations. The construction and maintenance passage allows operators to enter the interior of the tower to perform various installation and maintenance operations. Compared with the external connection method of the first tower 1 and the second tower 2, internal installation is safer and can reduce the impact of wind and waves on operators.

[0039] The construction platform 11 can be movably arranged in the second tower 2 through the suspension assembly. Specifically, the construction platform 11 can be lifted by the lifting mechanism following the installation node. In the installation process of the multi-section tower, the movable setting can be adjusted and moved in the multi-section tower according to the construction needs, providing a high degree of flexibility. The construction platform 11 can adapt to different construction tasks and changes in the internal structure of the tower, improve construction efficiency, reduce the space occupied inside the tower, and also facilitate the subsequent movement of the inspection and maintenance work inside the tower, so that construction personnel can reach the area that needs inspection or maintenance. Preferably, a slide rail for the longitudinal movement of the construction platform 11 is provided in the second tower 2, and a locking mechanism for fixing the height of the construction platform 11 is provided on the slide rail. The construction platform 11 is detachably connected to the slide rail, and the construction platform 11 can be lifted and fixed in the vertical direction by a crane, or an electric mechanism is provided on the construction platform 11 for vertical movement and adjustment, and the slide rail between two adjacent towers can be bridged. After fixing the second tower 2 by an external crane, the first tower 1 is hoisted and moved above the second tower 2. After the hoisting is completed, the internal staff manually installs bolts on the first tower 1 and the second tower 2.

[0040] The drive motor can be movably assembled in the first tower 1, and a temporary mounting frame for fixing the drive motor is provided in the first tower 1. Specifically, when installing any two adjacent towers, the upper tower is the first tower 1, and the lower tower is the second tower 2. Before installing the first tower 1 on the second tower 2, the drive motor is installed on the upper part of the first tower 1, and the drive motor is fixed by a temporary mounting frame. When the first tower 1 is moved to the top of the second tower 2 by a crane, the first tower 1 and the second tower 2 are connected by a traction rope 8, and the drive motor is connected to the lifting mechanism. The alignment and installation of the first tower 1 and the second tower 2 are completed by controlling the drive motor to drive the lifting mechanism. After the fixation is completed, a new tower needs to be installed above the first tower 1. At this time, the original first tower becomes the second tower, and the newly added tower becomes the first tower, and then the installation operation continues. Before the installation work is carried out, the traction part of the crane needs to be connected to the drive motor, the temporary mounting frame fixing the drive motor is released, and the drive motor is suspended and moved to the newly added tower, and fixed by the temporary mounting frame in the newly added tower to facilitate the next round of installation work.

[0041] The positioning hole 7 is located on the outer circumference of the limiting circular plate 6, and an arc-guiding structure is provided on the inner wall of the positioning hole 7. Specifically, several traction ropes 8 are provided on the outer circumference of the limiting circular plate 6, and the uniform distribution of pulling force is conducive to maintaining a stable state of the first tower 1, reducing the shaking of the first tower 1, and thus improving the stability effect during installation. During the traction process of the second lifting rod 5, the lower end of the traction rope 8 is in a vertical state, and the upper end is subjected to force in the direction of the second lifting rod 5. At this time, the traction rope 8 is subjected to centripetal force at the limiting circular plate 6. The continuous lifting process will cause friction between the traction rope 8 and the limiting circular plate 6. Providing an arc surface structure on the inner wall of the positioning hole 7 can reduce friction and reduce work consumption. This can not only increase the service life of the traction rope 8, but also reduce power consumption and improve energy utilization.

[0042] Embodiment 2: Based on embodiment 1, this embodiment proposes a construction method based on a tower structure, comprising the following steps:

[0043] S1: Hoisting operation, through the traction of the crane on the transport and installation ship, the first tower 1 is suspended and lifted, and it is horizontally moved to the top of the second tower 2 that has been assembled and fixed, and is ready for assembly. Previously, the drive motor has been installed in the first tower 1, and the construction platform 11 in the second tower 2 has been lifted to the top of the second tower 2, which is convenient for construction workers to carry out installation operations.

[0044] S2: traction connection, connect and fix several hooks 9 with the fixing rings 10 on the second tower 2 or foundation pile 12 below, and several hooks 9 are connected to several fixing rings 10 in sequence. This step can be fixed manually by construction personnel or by a mechanical arm.

[0045] S3: Traction guidance and uniform traction force, start the first lifting rod 4, lift the limit plate into the first tower 1, and move the crane toward the second tower 2, so that the traction force of each hook 9 is evenly distributed on the outer ring of the limit plate. In this process, ensure that the traction force of the traction rope 8 is evenly distributed on the outer ring of the limit circular plate 6 to achieve stable control and precise guidance of the first tower 1.

[0046] S4: Alignment and assembly. During the process of the crane pulling the first tower 1 close to the second tower 2, the second lifting rod 5 is started. At this time, the limit plate remains stationary and the second lifting rod 5 rises. At this time, the first tower 1 can be guided to the second tower 2, and the axes of the first tower 1 and the second tower 2 are aligned until several bolt connectors 3 on the first tower 1 and the second tower 2 correspond. Through this step, the outer walls and axes of the first tower 1 and the second tower 2 can be accurately aligned, while reducing the impact of the horizontal movement of the crane and the shaking of the first tower 1 by wind and waves, so that the bolt connectors 3 can accurately correspond. In the traditional assembly process, before the first tower 1 and the second tower 2 are installed, several construction workers are required to pull the first tower 1 inside the second tower 2 through ropes, and cooperate with the lowering of the crane to achieve the purpose of precise installation. This process usually takes several hours. However, the present application does not require human traction, and the alignment and assembly time can be controlled to be completed within one hour, greatly improving the assembly efficiency.

[0047] S5: Installation and fixing: After the first tower 1 and the second tower 2 are aligned, the second lifting rod 5 is stopped, and the first tower 1 and the second tower 2 are bolted together through the bolt connector 3 to complete the connection and installation. The construction personnel bolt the first tower 1 and the second tower 2 on the construction platform 11, and after the installation is completed, the drive motor and the construction platform 11 are removed, and the crane is used to lift them upward to the subsequent installation operation.

[0048] In step S2, a foundation pile 12 is arranged below the second tower 2, and a bolt connector 3 matching with the bottom of the second tower 2 is arranged around the top of the foundation pile 12. The assembly sequence of the second tower 2 and the foundation pile 12 is the same as steps S2 to S5.

[0049] In steps S3 to S5, a control system for controlling the crane and the lifting mechanism is provided. The control system, in the process of controlling the crane to rotate and lift the first tower 1, enables the lifting mechanism to automatically adjust according to the feedback through the monitoring component. Specifically, the control system is connected to the monitoring component, which includes a monitoring device, a position sensor and a torque sensor. During operation, the control system realizes the automatic control of the lifting rod and the traction rope 8. According to the real-time monitoring of the working status of each component, after the operator completes the connection of several hooks 9 with the fixing ring 10, the crane is controlled to move toward the second tower 2 (including the horizontal and longitudinal directions). During the movement, the pulling force of the traction rope 8 is always kept below the maximum traction force. When the first tower 1 moves to the top of the second tower 2, the crane controls the first tower 1 to move downward, and at the same time starts the second lifting rod 5 to pull the traction rope 8 upward, and controls the lowering speed of the first tower 1 to be the same as the lifting speed of the second lifting rod 5. This process can quickly move the first tower 1 and align it to the second tower 2, and automatically adjust it through the intelligent control system to improve the accuracy and efficiency of the operation.

[0050] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A tower structure, comprising a first tower (1) and a second tower (2) of the same structure, wherein the first tower (1) is located above the second tower (2), and the first tower (1) and the second tower (2) are connected by a plurality of bolt connectors (3) arranged circumferentially, characterized in that: A driving motor is arranged in the first tower (1), and the driving motor is connected to a vertically downward lifting mechanism, and the lifting mechanism comprises a first lifting rod (4) and a second lifting rod (5) which are independently controlled from each other, and the bottom of the first lifting rod (4) is connected to a limiting circular plate (6), and the diameter of the limiting circular plate (6) is equal to the inner diameter of the first tower (1), and the second lifting rod (5) is sleeved on the first lifting rod (4), and a plurality of positioning holes (7) corresponding to a plurality of bolt connectors (3) are arranged circumferentially on the limiting circular plate (6), and a traction rope (8) is passed through the traction rope (7), and the upper end of the traction rope (8) is fixed to the second lifting rod (5), and the lower end of the traction rope (8) is movably connected to the second tower (2) through a fixing component.

2. A tower structure according to claim 1, characterized in that: The maximum lifting height of the limiting circular plate (6) is not lower than the horizontal height corresponding to the bottom of the first tower (1).

3. A tower structure according to claim 1, characterized in that: The fixing assembly comprises a plurality of hooks (9) corresponding to the traction ropes (8) and a plurality of fixing rings (10), wherein the hooks (9) are fixedly connected to the bottom of the traction ropes (8), and the fixing rings (10) are arranged on the top inner wall of the second tower (2), and the plurality of fixing rings (10) correspond vertically one by one to the plurality of bolt connectors (3).

4. A tower structure according to claim 1, characterized in that: A construction platform (11) is provided at the upper end of the inner cavity of the second tower (2), and a construction and maintenance passage for operators to enter and exit is also provided on the second tower (2).

5. A tower structure according to claim 4, characterized in that: The construction platform (11) is movably arranged in the second tower (2) via a suspension assembly.

6. A tower structure according to claim 1, characterized in that: The drive motor can be movably mounted in the first tower (1), and a temporary mounting frame for fixing the drive motor is provided in the first tower (1).

7. A tower structure according to claim 1, characterized in that: The positioning hole (7) is located at the outer peripheral edge of the limiting circular plate (6), and an arc guiding structure is provided on the inner wall of the positioning hole (7).

8. A construction method of a tower structure, applied to a tower structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Hoisting operation, using a crane on a transport and installation vessel to lift and suspend the first tower (1), and move it to the top of the second tower (2) that has been assembled and fixed, and prepare for assembly; S2: traction connection, connecting and fixing a plurality of hook cables (9) to a fixing ring (10) on the second tower tube (2) or foundation pile (12) below, and connecting a plurality of hook cables (9) to a plurality of fixing rings (10) in sequence; S3: Traction guidance and uniform distribution of traction force, start the first lifting rod (4), lift the limit plate into the first tower (1), and move the crane towards the second tower (2) at the same time, so that the traction force of each hook rope (9) is evenly distributed on the outer ring of the limit plate; S4: Alignment and assembly. When the crane is pulling the first tower (1) toward the second tower (2), the second lifting rod (5) is started. At this time, the limit plate remains stationary and the second lifting rod (5) rises. At this time, the first tower (1) can be guided toward the second tower (2) and the axes of the first tower (1) and the second tower (2) are aligned until a plurality of bolt connectors (3) on the first tower (1) and the second tower (2) correspond. S5: Install and fix. After the first tower (1) and the second tower (2) are connected and aligned, the second lifting rod (5) is stopped, and the first tower (1) and the second tower (2) are bolted together through the bolt connection member (3), thereby completing the connection and installation.

9. A tower structure construction method according to claim 8, characterized in that: In step S2, a foundation pile (12) is arranged below the second tower (2), and a bolt connector (3) is arranged circumferentially on the top of the foundation pile (12) to cooperate with the bottom of the second tower (2). The assembly sequence of the second tower (2) and the foundation pile (12) is the same as steps S2 to S5.

10. A tower structure construction method according to claim 8, characterized in that: In steps S3 to S5, a control system for controlling a crane and a lifting mechanism is provided. In the process of controlling the crane to rotate and lift the first tower (1), the control system enables the lifting mechanism to automatically adjust according to feedback through a monitoring component.

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