Prestressed hollow combined structure tower drum based on steel pipe mortise and tenon joint connection and construction method

Abstract

The invention discloses a prestressed hollow combined structure tower drum based on steel pipe tenon-and-mortise joint connection and a construction method. The prestressed hollow combined structure tower drum comprises a drum body, the drum body is formed by assembling a plurality of drum sections in a segmented mode in the height direction, the adjacent drum sections are connected through steel pipe tenon-and-mortise joints, and the drum body is formed by connecting a plurality of hollow combined duct pieces through prestressed bent bolts in the annular direction. The hollow combined pipe piece comprises a hollow steel pipe, prestressed steel bars and a concrete shell. The steel pipe mortise and tenon joint comprises a concave tenon steel pipe, a convex tenon steel pipe, grouting materials and a PBL connecting piece welded to the outer wall of the convex tenon steel pipe. The advantages of a combined structure and a prestressed structure are exerted, the hollow steel pipes and the concrete are cooperatively stressed, the bearing capacity and rigidity of the tower drum are improved, the self weight is reduced, the anti-cracking performance of the tower drum is improved, and the service life of the tower drum is prolonged. The steel pipe tenon-and-mortise joint is high in strength, the reliability of the connecting structure is improved, and the bonding effect of the steel pipe and the grouting material is improved through the PBL connecting piece. According to the method, the field splicing efficiency of the assembly type tower drum is improved, and the method has wide application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection and a construction method. Background Art

[0002] In wind power projects, the tower is the main load-bearing component of the wind turbine generator set. It not only supports the entire nacelle and blades to achieve the optimal windward height, but also resists the swing and vibration of the unit. As the volume weight and height of wind turbine generator sets continue to increase, the importance of the tower is becoming more and more obvious.

[0003] At present, the main tower form adopts a steel-concrete hybrid structure tower, which has high overall structural rigidity and strong reliability, but has a long construction period, high installation costs, and complex design and construction. The concrete tower section has a large self-weight, dense steel mesh, and complex binding. At the same time, the concrete tower section mostly adopts on-site overall tensioning prestressing, which is complex to construct and difficult to guarantee the construction quality. Therefore, it is necessary to develop a new tower and connection method with superior performance, convenient construction, and lower cost. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a prestressed hollow composite structure tower and construction method based on steel pipe mortise and tenon joint connection, giving full play to the advantages of composite structure and prestressed structure, and the hollow steel pipe and concrete are synergistically stressed to improve the bearing capacity and rigidity of the tower, reduce the deadweight, and improve the crack resistance and service life of the tower by segmented prestressing. The steel pipe mortise and tenon joint has high strength, which improves the reliability of the connection structure, and the PBL connector increases the bonding effect between the steel pipe and the grouting material. The present invention improves the on-site splicing efficiency of the assembled tower, is convenient to construct, has good economy, and has broad application prospects.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A prestressed hollow composite structural tower based on steel tube mortise and tenon joint connections comprises a cylinder body, wherein the cylinder body is assembled in sections from a plurality of cylinder sections along the height direction, and adjacent cylinder sections are connected via steel tube mortise and tenon joints; each cylinder section is connected in the circumferential direction from a plurality of hollow composite pipe segments via prestressed bent bolts.

[0007] In one embodiment, the hollow composite segment comprises:

[0008] Arc-shaped steel bars are arranged at equal intervals along the height direction of the cylinder section;

[0009] Longitudinal reinforcements evenly arranged in the circumferential direction of the barrel;

[0010] Hollow steel tubes that are evenly arranged in the circumferential direction of the barrel and staggered with the longitudinal reinforcement;

[0011] A concrete shell set on the outside of the hollow steel tube;

[0012] End plates arranged at the upper and lower ends of the hollow steel tube;

[0013] Prestressed tendons arranged inside the hollow steel tube and passing through the end plate;

[0014] An anchor kit set at the end of the prestressed tendon.

[0015] In one embodiment, the arc-shaped steel bars are arranged in multiple layers along the radial direction of the barrel section, and the longitudinal steel bars are arranged in multiple layers along the radial direction of the barrel section.

[0016] In one embodiment, the end plate is provided with a reserved hole corresponding to the prestressed tendon, and the prestressed tendon is linear. After passing through the reserved hole of the end plate, it is tensioned to the design value by using the pre-tensioning method or the post-tensioning method.

[0017] In one embodiment, the hollow steel pipe is a round steel pipe or a square steel pipe, the concrete shell is made of ordinary concrete, high-strength concrete, self-compacting concrete or UHPC, and the prestressed tendons are made of high-strength steel wire or high-strength steel strand.

[0018] In one embodiment, reserved bolt grooves for circumferential connection are provided on both sides of the hollow combined pipe segments, and the reserved bolt grooves are provided with bolt holes. The circumferentially adjacent hollow combined pipe segments are circumferentially connected by passing prestressed bent bolts through the reserved bolt grooves.

[0019] In one embodiment, the steel pipe mortise and tenon node includes a concave-tenon steel pipe, a convex-tenon steel pipe, grouting material and a PBL connector welded to the outer wall of the convex-tenon steel pipe, the convex-tenon steel pipe is welded to the lower end of the end plate of the upper hollow combined pipe segment, the concave-tenon steel pipe is welded to the upper end of the end plate of the lower hollow combined pipe segment, the upper and lower adjacent hollow combined pipe segments are connected through the concave-tenon steel pipe and the convex-tenon steel pipe, and the grouting material is poured into the concave-tenon steel pipe.

[0020] In one embodiment, the wall thickness of the mortise and tenon steel pipe is the same as that of the convex and tenon steel pipe, and the outer diameter of the mortise and tenon steel pipe is the same as that of the hollow steel pipe, and the inner diameter of the mortise and tenon steel pipe is larger than the outer diameter of the convex and tenon steel pipe.

[0021] In one embodiment, the steel pipe mortise and tenon joints use butt-joint splicing or staggered-joint splicing to complete the vertical connection of the hollow composite pipe segments.

[0022] The construction method of the prestressed hollow composite structure tower tube based on the steel pipe mortise and tenon joint connection of the present invention mainly comprises the following steps:

[0023] 1) In the factory, complete the processing of hollow steel pipes, end plates and tenon steel pipes, tie arc steel bars and longitudinal steel bars, and pour the concrete shell;

[0024] 2) In the factory, when the concrete shell reaches the preset strength, prestressed tendons are arranged in the hollow steel tube and tensioned to the prestress design value to complete the processing of the hollow composite segment;

[0025] 3) On site, adjacent hollow composite segments are connected in an annular direction by prestressed bent bolts to form several tube sections.

[0026] 4) On site, adjacent tower sections are connected vertically through steel pipe mortise and tenon joints to complete on-site splicing of the wind turbine tower.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1) Convenient construction

[0029] The prestressed hollow composite structure tower tube based on the steel pipe mortise and tenon joint connection has a simple structure. The hollow composite segments are produced in a standardized manner in the factory, and the prestressed tendons are tensioned, which improves the construction efficiency and quality of the tensioning prestress. The adjacent segments are connected by prestressed bent bolts, and the adjacent tube sections are connected by steel pipe mortise and tenon joints, which improves the on-site splicing efficiency and has good construction performance.

[0030] 2) Performance Improvement

[0031] The prestressed hollow composite structure tower based on the steel tube mortise and tenon joint connection takes advantage of the composite structure and prestressed structure. The hollow steel tube and concrete are subjected to force in coordination, which improves the tower's bearing capacity and rigidity. The segmented prestressing improves the tower's crack resistance and service life. The steel tube mortise and tenon joint has high strength, which improves the reliability of the connection structure. The PBL connector increases the bonding effect between the steel tube and the grouting material.

[0032] 3) Reduce costs

[0033] The prestressed hollow composite structure based on steel pipe mortise and tenon joint connection adopts hollow steel pipes, which reduces material consumption and construction costs. At the same time, it can effectively reduce the dead weight of the structure, improve transportation and lifting efficiency, quickly assemble on site, reduce labor costs, and has good economic benefits.

[0034] In general, the prestressed hollow composite structure tower fully utilizes the advantages of the composite structure and the prestressed structure. The hollow steel pipe and concrete are synergistically stressed to improve the tower's bearing capacity and rigidity, reduce its own weight, and segmented prestressing improves the tower's crack resistance and service life. The steel pipe mortise and tenon joints have high strength, which improves the reliability of the connection structure. The PBL connector increases the bonding effect between the steel pipe and the grouting material. The present invention improves the on-site splicing efficiency of the assembled tower, is convenient to construct, has good economy, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1It is an overall schematic diagram of the prestressed hollow composite structure tower tube of the present invention.

[0036] Figure 2 It is a schematic diagram of the structure of the hollow composite segment of the present invention.

[0037] Figure 3 It is a schematic diagram of the circumferential splicing of the hollow composite segments of the present invention.

[0038] Figure 4 It is a connection schematic diagram of the steel pipe mortise and tenon joint in the present invention.

[0039] Figure 5 It is a schematic diagram of the vertical butt joint splicing of the tower tube in the present invention.

[0040] Figure 6 It is a schematic diagram of the vertical staggered splicing of the tower tube in the present invention.

[0041] Icons: 1- barrel; 2- barrel section; 3- steel pipe mortise and tenon joint; 4- hollow composite segment; 5- prestressed bent bolt; 6- arc-shaped steel bar; 7- longitudinal steel bar; 8- hollow steel pipe; 9- concrete shell; 10- end plate; 11- reserved hole; 12- prestressed tendon; 13- anchor kit; 14- reserved bolt groove; 15- concave tenon steel pipe; 16- convex tenon steel pipe; 17- grouting material; 18- PBL connector; 19- vertical seam connection. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product is usually placed when in use. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the present application.

[0046] like Figure 1 As shown, an embodiment of the present application provides a prestressed hollow composite structural tower based on steel pipe mortise and tenon joint connections, which includes a barrel 1. Along the height direction, the barrel 1 is assembled in sections by a plurality of barrel segments 2. Along the circumferential direction, each barrel segment 2 is connected by a plurality of hollow composite pipe segments 4.

[0047] The structure of a single hollow composite segment 4 is as follows: Figure 2 As shown, it mainly includes: a plurality of arc-shaped steel bars 6, a plurality of longitudinal steel bars 7, a plurality of hollow steel pipes 8, a concrete shell 9, a plurality of end plates 10, a plurality of prestressed tendons 12 and a plurality of anchor kits 13.

[0048] Among them, a single hollow composite segment 4 is an arc-shaped structure, and each hollow composite segment 4 in the annular direction is connected and combined into a closed cylinder section 2. Therefore, the arc-shaped steel bar 6 has the same curvature as the single hollow composite segment 4, and each arc-shaped steel bar 6 is preferably arranged at equal intervals along the height direction of the cylinder section 2. The length of the longitudinal steel bar 7 is basically the same as the height of the single hollow composite segment 4. Each longitudinal steel bar 7 is evenly arranged along the annular direction of the cylinder section 2. A single hollow steel pipe 8 is arranged along the height direction of the cylinder section 2, which is basically the same as the height of the single hollow composite segment 4. Each hollow steel pipe 8 is evenly arranged along the annular direction of the cylinder section 2 and staggered with the longitudinal steel bar 7, that is, the longitudinal steel bar 7 and the hollow steel pipe 8 are arranged without overlapping. The concrete shell 9 is arranged outside the hollow steel pipe 8, and the hollow steel pipe 8, the longitudinal steel bar 7 and the arc-shaped steel bar 6 are cast inside. The hollow steel pipe 8 and the concrete are synergistically stressed to improve the bearing capacity and rigidity. The end plates 10 are sealed at the upper and lower ends of the hollow steel pipe 8 , and their shape is the same as the cross-section of the hollow steel pipe 8 . The prestressed tendons 12 are arranged inside the hollow steel pipe 8 and pass through the end plates 10 at both ends, and the ends are anchored by the anchor kit 13 .

[0049] In one embodiment of the present invention, the arc-shaped steel bars 6 and the longitudinal steel bars 7 are arranged in multiple layers along the radial direction of the barrel section 2 to improve the overall performance. For example, two layers are preferred to meet the basic mechanical performance requirements of the tower.

[0050] In one embodiment of the present invention, during processing, a reserved hole 11 is processed in the end plate 10, and the reserved hole 11 corresponds to the prestressed tendon 12, and is used to allow the prestressed tendon 12 to pass through. The present invention selects the prestressed tendon 12 to be a straight line, and after passing through the reserved hole 11 of the end plate 10, it is tensioned to the design value by using the pre-tensioning method or the post-tensioning method, and the crack resistance and service life of the tower are improved by segmented prestressing. For example, the prestressed tendon 12 can be made of high-strength steel wire or high-strength steel strand.

[0051] In one embodiment of the present invention, the hollow steel tube 8 can be a round steel tube or a square steel tube, and can also have a slight curvature. The present invention selects a square steel tube, and its size and arrangement quantity are designed according to the performance requirements of different towers. At this time, the end plate 10 is a rectangular plate, which can more conveniently process the upper and lower connection nodes.

[0052] In one embodiment of the present invention, the concrete shell 9 can be made of ordinary concrete, high-strength concrete, self-compacting concrete or UHPC, and can be designed according to the performance requirements of different towers.

[0053] refer to Figure 1 and Figure 3 In the present invention, a plurality of hollow composite segments 4 are connected in the circumferential direction by prestressed bent bolts 5 to form a barrel section 2. Further, reserved bolt grooves 14 are provided on both sides of a single hollow composite segment 4, where both sides refer to both sides of the circumferential direction of the hollow composite segment 4. The reserved bolt grooves 14 are groove structures, and there is a distance between the edges of the aforementioned "both sides". Bolt holes along an arc shape of an annular ring are provided in the grooves. The prestressed bent bolts 5 pass through the corresponding bolt holes of the circumferentially adjacent hollow composite segments 4, and the circumferentially adjacent hollow composite segments 4 can be connected as one in the circumferential direction.

[0054] refer to Figure 1 and Figure 4 In the present invention, adjacent tube sections 2 are connected by steel pipe mortise and tenon joints 3. Steel pipe mortise and tenon joints 3 are upper and lower connection joints of the present invention, which mainly include concave and mortise steel pipes 15, convex and mortise steel pipes 16, grouting materials 17 and PBL connectors 18, wherein the convex and mortise steel pipes 16 are welded to the lower end of the end plate 10 of the upper hollow combined pipe segment 4, the concave and mortise steel pipes 15 are welded to the upper end of the end plate 10 of the lower hollow combined pipe segment 4, and the upper and lower adjacent hollow combined pipe segments 4 are connected by the concave and mortise steel pipes 15 and the convex and mortise steel pipes 16, and the grouting materials 17 are poured into the concave and mortise steel pipes 15, and the PBL connectors 18 are welded to the outer wall of the convex and mortise steel pipes 16 to increase the bonding effect between each steel pipe and the grouting materials 17. The upper and lower connection mode of the steel pipe mortise and tenon joints 3 adopted in the present invention is simple in structure, tightly combined, and has high splicing efficiency, thereby improving the reliability of the connection structure.

[0055] In one embodiment of the present invention, the wall thickness of the tenon steel tube 15 is the same as the wall thickness of the convex steel tube 16, and the outer diameter of the tenon steel tube 15 is the same as the outer diameter of the hollow steel tube 8, and the inner diameter of the tenon steel tube 15 is larger than the outer diameter of the convex steel tube 16, so that the convex steel tube 16 has an interference effect after being inserted into the tenon steel tube 15, and is tightly combined.

[0056] In one embodiment of the present invention, Figure 5 As shown, the steel tube mortise and tenon joint 3 uses butt joint splicing to complete the vertical connection of the hollow combined pipe segment 4, that is, adjacent hollow combined pipe segments 3 of the same height are connected in an annular direction to obtain a plurality of cylinder sections 2 of the same height, and the vertical seam connections 19 of adjacent cylinder sections 2 are in the same plane along the height direction of the cylinder body 1. This embodiment has the advantages of easy positioning and convenient construction.

[0057] In one embodiment of the present invention, Figure 6 As shown, the steel tube mortise and tenon joints 3 use staggered splicing to complete the vertical connection of the hollow combined pipe segments 4, that is, adjacent hollow combined pipe segments 3 of different heights are circumferentially connected to obtain a number of cylinder sections 2 of unequal heights, and the vertical seam connections 19 of adjacent cylinder sections 2 are not in the same plane along the height direction of the cylinder body 1. This embodiment makes the structure more evenly stressed and has better integrity.

[0058] The specific construction method of the present invention is:

[0059] 1. In the factory, the hollow steel pipe 8, the end plate 10 and the tenon steel pipe 15 are processed, the arc-shaped steel bars 6 and the longitudinal steel bars 7 are tied, and the concrete shell 9 is poured;

[0060] 2. In the factory, when the concrete shell 9 reaches the preset strength, the prestressed tendons 12 are arranged in the hollow steel pipe 8 and tensioned to the prestressed design value, and the processing of the hollow composite pipe segment 4 is completed;

[0061] 3. On site, adjacent hollow composite segments 4 are connected in an annular direction by prestressed bent bolts 5 to form several tube sections 2.

[0062] 4. On site, adjacent tube sections 2 are vertically connected through steel pipe mortise and tenon joints 3 to complete on-site splicing of the wind turbine tower.

[0063] In summary, the present invention provides a prestressed hollow composite structure tower and construction method based on steel pipe mortise and tenon node connection, wherein the barrel is assembled in sections by a plurality of barrel sections along the height direction, and adjacent barrel sections are connected by steel pipe mortise and tenon nodes, and are connected by a plurality of hollow composite pipe segments by prestressed bent bolts along the circumferential direction. The steel pipe mortise and tenon node comprises a concave tenon steel pipe, a convex tenon steel pipe, a grouting material, and a PBL connector welded to the outer wall of the convex tenon steel pipe. The present invention takes advantage of the combined structure and the prestressed structure, and the hollow steel pipe and the concrete are synergistically stressed to improve the bearing capacity and rigidity of the tower, reduce the deadweight, and the segmented prestressing improves the crack resistance and service life of the tower. The steel pipe mortise and tenon node has high strength, improves the reliability of the connection structure, and the PBL connector increases the bonding effect between the steel pipe and the grouting material. The present invention improves the on-site splicing efficiency of the assembled tower, is convenient to construct, has good economy, and has broad application prospects.

[0064] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection, characterized in that: The invention comprises a cylinder body (1), wherein the cylinder body (1) is assembled in sections from a plurality of cylinder sections (2) in the height direction, and adjacent cylinder sections (2) are connected via steel pipe mortise and tenon joints (3); each cylinder section (2) is connected in the circumferential direction from a plurality of hollow combined pipe segments (4) via prestressed bent bolts (5).

2. The prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to claim 1 is characterized in that: The hollow composite segment (4) comprises: Arc-shaped steel bars (6) arranged at equal intervals along the height direction of the cylinder section (2); Longitudinal steel bars (7) uniformly arranged in the circumferential direction of the cylinder section (2); Hollow steel pipes (8) uniformly arranged in the circumferential direction of the cylinder section (2) and arranged alternately with the longitudinal steel bars (7); A concrete shell (9) disposed outside the hollow steel pipe (8); End plates (10) arranged at the upper and lower ends of the hollow steel pipe (8); A prestressed tendon (12) disposed inside the hollow steel pipe (8) and passing through the end plate (10); An anchor set (13) is arranged at the end of the prestressed tendon (12).

3. The prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to claim 2 is characterized in that: The arc-shaped steel bars (6) are arranged in multiple layers along the radial direction of the barrel section (2), and the longitudinal steel bars (7) are arranged in multiple layers along the radial direction of the barrel section (2).

4. The prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to claim 2 is characterized in that: The end plate (10) is provided with a reserved hole (11) corresponding to the prestressed tendon (12); the prestressed tendon (12) is linear and is tensioned to a design value by using a pre-tensioning method or a post-tensioning method after passing through the reserved hole (11) of the end plate (10).

5. The prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to claim 2 is characterized in that: The hollow steel pipe (8) is a round steel pipe or a square steel pipe, the concrete shell (9) is made of ordinary concrete, high-strength concrete, self-compacting concrete or UHPC, and the prestressed tendons (12) are made of high-strength steel wire or high-strength steel strand.

6. The prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to claim 2 is characterized in that: The hollow combined pipe segments (4) are provided with reserved bolt grooves (14) for circumferential connection on both sides, and the reserved bolt grooves (14) are provided with bolt holes. The circumferentially adjacent hollow combined pipe segments (4) are circumferentially connected by passing prestressed bent bolts (5) through the reserved bolt grooves (14).

7. The prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to any one of claims 2 to 6, characterized in that: The steel pipe mortise and tenon joint (3) comprises a concave-tenon steel pipe (15), a convex-tenon steel pipe (16), a grouting material (17), and a PBL connector (18) welded to the outer wall of the convex-tenon steel pipe (16); the convex-tenon steel pipe (16) is welded to the lower end of the end plate (10) of the upper hollow combined pipe segment (4); the concave-tenon steel pipe (15) is welded to the upper end of the end plate (10) of the lower hollow combined pipe segment (4); the upper and lower adjacent hollow combined pipe segments (4) are connected to the convex-tenon steel pipe (16) through the concave-tenon steel pipe (15), and the grouting material (17) is poured into the concave-tenon steel pipe (15).

8. The prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to claim 7 is characterized in that: The wall thickness of the concave-tenon steel pipe (15) is the same as that of the convex-tenon steel pipe (16), and the outer diameter of the concave-tenon steel pipe (15) is the same as that of the hollow steel pipe (8), and the inner diameter of the concave-tenon steel pipe (15) is greater than the outer diameter of the convex-tenon steel pipe (16).

9. The prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to claim 7 is characterized in that: The steel pipe mortise and tenon joint (3) uses butt joint splicing or staggered joint splicing to complete the vertical connection of the hollow combined pipe segments (4).

10. The construction method of a prestressed hollow composite structure tower based on steel pipe mortise and tenon joint connection according to any one of claims 7 to 9, characterized in that: include: 1) In the factory, the hollow steel pipe (8), the end plate (10) and the tenon steel pipe (15) are processed, the arc-shaped steel bars (6) and the longitudinal steel bars (7) are tied, and the concrete shell (9) is poured; 2) In the factory, when the concrete shell (9) reaches a preset strength, prestressed tendons (12) are arranged in the hollow steel pipe (8) and tensioned to the prestressing design value, thereby completing the processing of the hollow composite pipe segment (4); 3) On site, adjacent hollow composite segments (4) are connected in an annular direction by prestressed bent bolts (5) to form a plurality of tube sections (2). 4) On site, adjacent tower sections (2) are vertically connected via steel pipe mortise and tenon joints (3), completing the on-site splicing of the wind turbine tower.

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