Fabricated hollow interlayer concrete-filled steel tube wind power tower drum and mounting method

Abstract

The invention relates to the technical field of wind power generation equipment, and discloses a fabricated hollow interlayer concrete-filled steel tube wind power tower drum and an installation method.The fabricated hollow interlayer concrete-filled steel tube wind power tower drum comprises tower drum ring pieces which are sequentially spliced, each layer of tower drum ring piece comprises a pair of drum bodies filled with concrete interlayers, and limiting blocks are fixed to the lower ends of the concrete interlayers; the paired cylinders are connected through transverse prestressed tendons; a concave connector and a convex connector are welded to the upper end and the lower end of the drum body respectively, every two adjacent tower drum ring pieces are connected through a longitudinal prestressed tendon, and the concave connector and the convex connector which are in contact are matched. The device meets the requirements of the ultrahigh wind power tower for structural strength and vibration control. In addition, by means of the prefabricated ring pieces and the internal prestress connection scheme, the transportation and construction difficulty of the tower drum is lowered, and the overall period from production to service is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation equipment, and in particular to an assembled hollow sandwich steel tube concrete wind power tower and an installation method thereof. Background Art

[0002] As renewable clean energy generation becomes the strategic focus and main layout direction of my country's future energy development, wind power generation, as an important way to utilize renewable energy, is entering a new stage with increased single-unit capacity. Compared with traditional wind power generation systems, high-altitude wind power generation has higher power generation efficiency, stronger stability and lower power generation costs. However, as the height of wind turbines continues to increase, the load on the tower also increases, especially in extreme climatic conditions, such as low temperature, offshore waves, typhoons and heavy rains. Due to the insufficient bearing capacity and durability of traditional steel towers, the further development of high-altitude wind power generation is limited. Therefore, it is urgent to develop a new tower structure to meet the technical requirements of ultra-high wind turbines for structural stiffness and vibration control.

[0003] As a new type of tower, the hollow sandwich steel tube concrete tower not only has the characteristics of simple structure and convenient construction, but also has excellent bending stiffness and stability, which can effectively cope with the different working conditions faced by high-altitude wind turbine towers. In addition, the hollow sandwich steel tube concrete tower can effectively suppress the adverse vibration caused by aerodynamic loads by changing the structural stiffness and dynamic characteristics. Therefore, the hollow sandwich steel tube concrete tower has become an important solution for the support structure of ultra-high wind turbines.

[0004] Moreover, for large wind turbines, prefabricated wind turbine towers are efficient, economical and flexible, and have become an important technical means in modern wind power projects. The modular design simplifies the transportation and installation process of the tower, significantly improves construction efficiency, and reduces the difficulty caused by transportation restrictions and complex construction conditions. In addition, the prefabricated structure improves the convenience of tower maintenance and upgrading. By replacing or adding modules, it can quickly adapt to the progress of wind power technology and operational needs, thereby improving the economy and long-term sustainability of wind turbines.

[0005] However, for the existing hollow sandwich steel tube concrete tower, the overall bearing capacity and processing and installation efficiency still need to be improved. Therefore, the present invention proposes an assembled hollow sandwich steel tube concrete wind power tower. Summary of the invention

[0006] In order to meet the current development needs of ultra-high wind power tower units, the present invention provides an assembled hollow sandwich steel tube concrete wind power tower and an installation method.

[0007] The present invention is implemented by the following technical scheme: it comprises tower ring segments which are spliced ​​in sequence, and each layer of tower ring segments comprises a pair of cylinder bodies filled with concrete interlayers, the upper end of the concrete interlayers is provided with embedded mounting pipes, and the lower end of the concrete interlayers is fixed with limit blocks which cooperate with the embedded mounting pipes of the lower layer; a transverse rib tube and a longitudinal rib tube are provided in the cylinder body, and the paired cylinder bodies are connected by transverse prestressed tendons installed in the transverse rib tubes; a concave joint and a convex joint are respectively welded on the upper and lower ends of the cylinder body, and upper rib holes and lower rib holes are respectively opened on the concave joint and the convex joint at positions corresponding to the longitudinal rib tubes, upper through holes of the limit blocks are respectively opened at positions corresponding to the embedded mounting pipes, and a lower through hole of the limit block for passing the limit block is opened on the convex joint; two adjacent tower ring segments are connected by the longitudinal prestressed tendons passed through the longitudinal rib tubes, and the contacting concave joint and convex joint cooperate.

[0008] During implementation, the outer diameter of the tower remains unchanged or gradually decreases from bottom to top, including tower ring segments spliced ​​in sequence from bottom to top, the horizontal cross-section of the tower ring segment is polygonal or circular, the tower ring segment is a hollow sandwich steel tube concrete structure, each layer of the tower ring segment includes a pair of cylinders filled with concrete interlayers, the outer diameter of the cylinder is less than or equal to 4.5m, the cylinder wall thickness of the cylinder is 10-30mm, the cylinder includes an inner cylinder wall and an outer cylinder wall, the inner cylinder wall and the outer cylinder wall are made of steel with a strength greater than 345Mpa, the inner cylinder wall and the outer cylinder wall are made of steel with a strength greater than 345Mpa, and the inner cylinder wall and the outer cylinder wall are made of steel with a strength greater than 345Mpa. The straight edge is fixed by welding the side plate; a micro-expansion agent is added to the grouting material of the concrete interlayer, and the strength of the concrete interlayer is greater than or equal to 40Mpa. For example, ordinary concrete, recycled concrete, and high-strength concrete are used to make the concrete interlayer, and the thickness is greater than or equal to 3 times the diameter of the limit block. Further, the thickness is greater than or equal to 100mm. The upper end of the concrete interlayer is provided with an embedded installation pipe, and the lower end of the concrete interlayer is fixed with a limit block that cooperates with the embedded installation pipe of the lower layer, and the limit block limits the rotation and horizontal displacement of the tower ring segment; A transverse rib-penetrating tube and a longitudinal rib-penetrating tube are arranged inside the cylinder. The transverse rib-penetrating tube openings on the side plates of the two cylinders in a pair are directly opposite to each other. The cylinders in a pair are connected by transverse prestressed tendons installed in the transverse rib-penetrating tube, that is, the cylinders in a pair are connected by transverse internal prestressing. The upper and lower ends of the cylinder are respectively welded with a concave joint and a convex joint, and the concave joint and the convex joint are respectively provided with upper rib holes and lower rib holes at positions corresponding to the longitudinal rib tubes, and the concave joint and the embedded installation tube are respectively provided with upper through holes of the limit block, and the convex joint is provided with a lower through hole of the limit block for passing through the limit block; Two adjacent tower ring segments are connected by longitudinal prestressed tendons installed in the longitudinal rib tube, and the contacting concave joints and convex joints cooperate. The concave joints and convex joints limit the horizontal displacement between the two adjacent tower ring segments and are fixed by the longitudinal body prestressing connection.

[0009] During production, the tower ring segments are prefabricated in the factory, and only need to be assembled and prestressed on site. The specific steps include: Place the convex joint horizontally with the raised side facing downward. The height of the convex joint should be no less than 20 cm from the ground. Weld and fix the longitudinal rib-penetrating tube to the lower rib-penetrating hole, and install the limit block in the lower hole of the limit block. The inner cylinder wall and the outer cylinder wall are welded to the side plates along the longitudinal seams to form a cylinder steel structure, and the two ends of the transverse rib-piercing tube are welded to the side plates and the inner cylinder wall respectively; Clean the upper surface of the convex joint and set up temporary support at the gap between the convex joint and the ground to ensure that the limit block and the longitudinal rib tube do not move during the production process. Weld the lower edge of the cylinder to the edge of the convex joint; The pipe opening of the longitudinal rib-penetrating pipe, as well as the lower rib-penetrating hole and the lower through hole of the limit block set on the convex joint are blocked to prevent concrete materials from entering the pre-buried pipe during grouting and pouring. A temporary support structure is set at the opening at the upper end of the cylinder to fix the pre-buried installation pipe and the longitudinal rib-penetrating pipe. The position of the pre-buried installation pipe is aligned with the position of the through hole on the limit block on the concave joint to ensure that the position of the pre-buried installation pipe remains unchanged during the concrete pouring process and that the longitudinal rib-penetrating pipe does not deviate. Concrete is poured from the opening at the upper end of the cylinder to form a concrete interlayer. After the curing of the concrete interlayer is completed, the temporary support structure set at the upper end of the cylinder is removed; Weld the upper edge of the cylinder to the edge of the concave joint, and weld the joint between the pre-buried installation pipe opening and the hole on the limit block on the concave joint; Clean the surface of the tower ring segment and evenly apply anti-corrosion primer, intermediate coating and strong weather-resistant topcoat; after coating, check whether the coating is uniform, whether there is any missing coating, blistering or peeling, and repair it in time to ensure the integrity of the anti-corrosion layer. The prefabrication of the tower ring segment is completed.

[0010] The present invention also provides a method for installing an assembled hollow sandwich steel tube concrete wind power tower, comprising the following steps: a. Check the size and clean the surface of the cylinder, seal the longitudinal joints of the cylinder, and apply waterproof sealant to the longitudinal joints of the cylinder for sealing. Specifically, apply sealing water between the inner cylinder wall and the side plate and between the outer cylinder wall and the side plate; place two pairs of cylinders facing each other, and butt the transverse ribbed pipes on the two opposite side plates.

[0011] b. Pass the transverse prestressed tendons through the transverse reinforcement tube and apply prestress at both ends of the transverse prestressed tendons to form a firm connection between the cylinders.

[0012] c. Through the prestressed grouting process, grouting material is injected into the transverse reinforcement tube, and the prestressed structure is tightly combined with the cylinder to form a tower ring, thereby improving the durability and bearing capacity of the prestressed structure.

[0013] d. Inspect the size and clean the surface of the tower ring segment, use lifting equipment to lift the tower ring segment located in the previous section, use a positioning device or a guide system for auxiliary positioning, connect the convex joint of the tower ring segment located in the previous section with the concave joint of the tower ring segment located in the next section, and at the same time, pass the limit block through the through hole on the limit block, and install the limit block in the embedded installation pipe of the tower ring segment located in the next section. The connection between the two tower ring segments is sealed, and waterproof sealant is applied between the two tower ring segments for sealing.

[0014] e. After the installation of the multi-section tower ring segments is completed, the longitudinal prestressed tendons are inserted into the longitudinal tendon tubes from top to bottom to ensure that the prestressed tendons are not bent or damaged during the insertion process. The reserved tail ends of the longitudinal prestressed tendons are fixed with fixed anchors to prevent them from displacement or slipping during the construction process. The longitudinal prestressed tendon installation process is assisted by traction equipment or tendon insertion devices.

[0015] f. Apply prestress to the reserved tail end of the longitudinal prestressed tendon for tensioning, inject grouting material into the longitudinal reinforcement tube, tightly combine the prestressed structure with the cylinder, use tensioning jacks for tensioning, gradually increase the tensioning force, and monitor the force and displacement at each stage.

[0016] g. After the tensioning is completed, the final tensioning force test is carried out to confirm whether the tensioning force of the prestressed tendons meets the design specifications, and the tensioning force, tensioning displacement and displacement data of the anchor point are recorded for subsequent inspection and quality control.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an assembled hollow sandwich steel tube concrete wind power tower and an installation method thereof. Through the combination of inner and outer steel tubes and concrete filling layers, the overall stiffness and damping performance of the structure are effectively improved; the concrete interlayer in the tower can be used as a damping layer to absorb vibration energy, reduce the propagation and reflection of vibration, and thus reduce the resonance risk of the structure.

[0018] The present invention adopts modular design and prefabricated construction technology, which can improve production efficiency, reduce costs and optimize transportation and installation processes; the modular solution realizes the standardized production process of tower ring segments, thereby effectively shortening the production cycle; the prefabricated installation solution of the ring segments is suitable for various terrains and environmental conditions, especially for wind farms in high wind speed areas.

[0019] The present invention applies internal prestress between the ring segments and the segments, giving full play to the combined effect of the hollow sandwich steel tube concrete to improve the strength and overall stability of the tower; the internal prestress significantly improves the overall structural strength and wind resistance of the wind turbine tower, and effectively reduces the vibration and deformation risks of the wind turbine tower in a complex environment; the internal prestress assembly scheme improves the installation speed and efficiency of the wind turbine tower, while reducing the subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram showing the structure of the present invention.

[0021] Figure 2 The figure shows the installation diagram of the cylinder, the concave joint and the convex joint in the present invention.

[0022] Figure 3 A schematic diagram showing the structure of the cylinder in the present invention.

[0023] Figure 4 A schematic structural diagram of a concave joint in the present invention is shown.

[0024] Figure 5 A schematic structural diagram showing a male connector according to the present invention.

[0025] In the figure: 1-tower ring; 2-transverse prestressed tendons; 3-longitudinal prestressed tendons; 4-concave joints; 5-convex joints; 6-cylinder body; 601-inner cylinder wall; 602-outer cylinder wall; 603-side plates; 7-longitudinal reinforcement tubes; 8-transverse reinforcement tubes; 9-limiting blocks; 10-embedded installation pipes; 11-lower through holes of limiting blocks; 12-lower through-reinforcement holes; 13-concrete interlayer; 14-upper through holes of limiting blocks; 15-upper through-reinforcement holes. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are described below in conjunction with the accompanying drawings. Example 1

[0027] An assembled hollow sandwich steel tube concrete wind power tower, such as Figures 1 to 5 As shown, the outer diameter of the tower remains unchanged or gradually decreases from bottom to top, including tower ring segments 1 spliced ​​in sequence from bottom to top, the horizontal cross-section of the tower ring segment 1 is polygonal or circular, and the tower ring segment 1 is a hollow sandwich steel tube concrete structure, such as Figure 2As shown, each layer of the tower ring segment 1 includes a pair of cylinders 6 filled with a concrete interlayer 13, the outer diameter of the cylinder 6 is less than or equal to 4.5m, the cylinder wall thickness of the cylinder 6 is 10-30mm, the cylinder includes an inner cylinder wall 601 and an outer cylinder wall 602, the inner cylinder wall 601 and the outer cylinder wall 602 are made of steel with a strength greater than 345Mpa, and the straight edges of the inner cylinder wall 601 and the outer cylinder wall 602 are welded and fixed by side plates 603; a micro-expansion agent is added to the grouting material of the concrete interlayer 13, and the strength of the concrete interlayer 13 is greater than or equal to 40Mpa. For example, the concrete interlayer is made of ordinary concrete, recycled concrete, or high-strength concrete, and the thickness is greater than or equal to 100mm. The upper end of the concrete interlayer 13 is provided with a pre-buried installation pipe 10, and the lower end of the concrete interlayer 13 is fixed with a limit block 9 that cooperates with the pre-buried installation pipe 10 of the lower layer, and the limit block 9 limits the rotation and horizontal displacement of the tower ring segment 1; A transverse rib tube 8 and a longitudinal rib tube 7 are provided in the cylinder 6, and the transverse rib tube openings on the side plates 603 of the two paired cylinders 6 are directly opposite to each other. The paired cylinders 6 are connected by the transverse prestressed tendons 2 installed in the transverse rib tube 8, that is, the paired cylinders 6 are connected by the transverse internal prestressed force; like Figure 4 , 5 As shown, the upper and lower ends of the cylinder 6 are respectively welded with a concave joint 4 and a convex joint 5, and the concave joint 4 and the convex joint 5 are respectively provided with an upper rib hole 15 and a lower rib hole 12 at positions corresponding to the longitudinal rib tube 7, and the concave joint 4 and the embedded installation tube 10 are respectively provided with a limit block upper through hole 14 at positions corresponding to the embedded installation tube 10, and the convex joint 5 is provided with a limit block lower through hole 11 for passing the limit block 9; Two adjacent tower ring segments 1 are connected by longitudinal prestressed tendons 3 installed in longitudinal rib tubes 7, and the contacting concave joints 4 and convex joints 5 cooperate. The concave joints 4 and convex joints 5 limit the horizontal displacement between the two adjacent layers of tower ring segments 1, and are fixed by longitudinal internal prestressing.

[0028] During production, the tower ring segment 1 is prefabricated in the factory, and only needs to be assembled and prestressed on site. The specific steps include: Place the convex joint 5 horizontally with the convex surface facing downward. The height of the convex joint 5 is not less than 20 cm from the ground. Weld and fix the longitudinal rib-piercing tube 7 to the lower rib-piercing hole 12. Install the limit block 9 in the lower through hole 11 of the limit block. The inner cylinder wall 601 and the outer cylinder wall 602 are welded to the side plate 603 along the longitudinal seam to form the cylinder body 6 steel structure, and the two ends of the transverse rib tube 8 are welded to the side plate 603 and the inner cylinder wall 601 respectively; Clean the upper surface of the convex joint 5, and set up temporary support at the gap between the convex joint 5 and the ground to ensure that the limit block 9 and the longitudinal rib tube 7 do not move during the production process. Weld the lower edge of the cylinder 6 to the edge of the convex joint 5; The pipe opening of the longitudinal rib-penetrating pipe 7, the lower rib-penetrating hole 12 and the lower through hole 11 of the limit block provided on the convex joint 5 are blocked to prevent the concrete material from entering and pre-buried pipes during the grouting process. A temporary support structure is provided at the upper opening of the cylinder 6 to fix the pre-buried installation pipe 10 and the longitudinal rib-penetrating pipe 7. The position of the pre-buried installation pipe 10 is aligned with the position of the through hole 14 on the limit block on the concave joint 4 to ensure that the position of the pre-buried installation pipe 10 remains unchanged during the concrete pouring process and that the longitudinal rib-penetrating pipe 7 does not deviate. Concrete is poured from the opening at the upper end of the cylinder 6 to form a concrete interlayer 13. After the curing of the concrete interlayer 13 is completed, the temporary support structure provided at the upper end of the cylinder 6 is removed; The upper edge of the cylinder 6 is welded to the edge of the concave joint 4, and the joint between the pre-buried installation pipe opening and the through hole 14 on the limit block on the concave joint 4 is welded to fix; Clean the surface of tower ring segment 1, and evenly apply anti-corrosion primer, intermediate coating and strong weather-resistant topcoat; after coating, check whether the coating is uniform, whether there is any missing coating, blistering or peeling, and repair it in time to ensure the integrity of the anti-corrosion layer. The prefabrication of tower ring segment 1 is completed. Example 2

[0029] A method for installing an assembled hollow sandwich steel tube concrete wind power tower comprises the following steps: a. Dimension inspection and surface cleaning of the cylinder 6 are performed, and the longitudinal joints of the cylinder 6 are sealed. Waterproof sealant is applied to the longitudinal joints of the cylinder for sealing. Specifically, sealing water is applied between the inner cylinder wall 601 and the side plate 603 and between the outer cylinder wall 602 and the side plate 603; two pairs of cylinders 6 are placed facing each other, and the transverse rib-piercing pipe openings on the two opposite side plates 603 are butt-jointed.

[0030] b. Pass the transverse prestressed tendons 2 through the transverse tendon tube 8, and apply prestress to both ends of the transverse prestressed tendons 2 to form a firm connection between the cylinders 6.

[0031] c. Through the prestressed grouting process, grouting material is injected into the transverse reinforcement tube 8, and the prestressed structure is tightly combined with the cylinder 6 to form a tower ring 1, thereby improving the durability and bearing capacity of the prestressed structure.

[0032] d. Perform size inspection and surface cleaning on the tower ring segment 1, lift the tower ring segment 1 located in the upper section with a lifting device, use a positioning device or a guide system for auxiliary positioning, dock the convex joint 5 of the tower ring segment 1 located in the upper section with the concave joint 4 of the tower ring segment 1 located in the lower section, and at the same time, pass the limit block 9 through the through hole 14 on the limit block, and install the limit block 9 in the embedded installation pipe 10 of the tower ring segment 1 located in the lower section. The connection between the two tower ring segments 1 is sealed, and waterproof sealant is applied between the two tower ring segments 1 for sealing.

[0033] e. After the multi-section tower ring segment 1 is hoisted, the longitudinal prestressed tendons 3 are inserted into the longitudinal tendon tube 7 from top to bottom to ensure that the prestressed tendons are not bent or damaged during the insertion process. The reserved tail ends of the longitudinal prestressed tendons 3 are fixed with fixed anchors to prevent them from displacement or slipping during the construction process. The longitudinal prestressed tendons 3 are assisted by traction equipment or tendon insertion devices.

[0034] f. Apply prestress to the reserved tail end of the longitudinal prestressed tendon 3 for tensioning, inject grouting material into the longitudinal tendon tube 7, tightly combine the prestressed structure with the cylinder 6, use tensioning jacks for tensioning, gradually increase the tensioning force, and monitor the force value and displacement at each stage.

[0035] g. After the tensioning is completed, the final tensioning force test is carried out to confirm whether the tensioning force of the prestressed tendons meets the design specifications, and the tensioning force, tensioning displacement and displacement data of the anchor point are recorded for subsequent inspection and quality control.

[0036] The scope of protection claimed by the present invention is not limited to the above specific embodiments. For those skilled in the art, the present invention may have various deformations and changes. Any modifications, improvements and equivalent substitutions made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled hollow sandwich steel tube concrete wind power tower, characterized by: The tower ring segments (1) are sequentially spliced, each layer of the tower ring segments (1) comprising a pair of cylinders (6) filled with a concrete interlayer (13), the upper end of the concrete interlayer (13) being provided with a pre-buried installation pipe (10), the lower end of the concrete interlayer (13) being fixed with a limit block (9) cooperating with the pre-buried installation pipe (10) of the lower layer; a transverse rib-penetrating pipe (8) and a longitudinal rib-penetrating pipe (7) being provided in the cylinder (6), and the paired cylinders (6) being connected via transverse prestressed ribs (2) installed in the transverse rib-penetrating pipe (8); The upper and lower ends of the cylinder (6) are respectively welded with a concave joint (4) and a convex joint (5); the concave joint (4) and the convex joint (5) are respectively provided with an upper rib-penetrating hole (15) and a lower rib-penetrating hole (12) at positions corresponding to the longitudinal rib-penetrating tube (7); the concave joint (4) and the convex joint (5) are respectively provided with a limit block upper through hole (14) at positions corresponding to the embedded installation tube (10); and the convex joint (5) is provided with a limit block lower through hole (11) for passing the limit block (9); Two adjacent tower ring segments (1) are connected by longitudinal prestressed tendons (3) inserted into longitudinal tendon tubes (7), and the contacting concave joints (4) and convex joints (5) are matched.

2. The assembled hollow sandwich steel tube concrete wind power tower according to claim 1, characterized in that: The cylinder body comprises an inner cylinder wall (601) and an outer cylinder wall (602), and the straight edges of the inner cylinder wall (601) and the outer cylinder wall (602) are fixed by welding via a side plate (603).

3. The assembled hollow sandwich steel tube concrete wind power tower according to claim 1, characterized in that: The outer diameter of the cylinder (6) is less than or equal to 4.5 mm, and the wall thickness of the cylinder (6) is 10 to 30 mm.

4. The assembled hollow sandwich steel tube concrete wind power tower according to claim 2, characterized in that: The openings of the transverse rib-penetrating pipes on the side plates (603) of the two paired cylinders (6) are directly opposite to each other.

5. A method for installing an assembled hollow sandwich steel tube concrete wind power tower, characterized in that: The following steps are involved: a. Dimension inspection and surface cleaning of the cylinder (6) are performed, and the longitudinal joints of the cylinder (6) are sealed. Two cylinders (6) are placed in pairs facing each other, and the transverse rib-piercing pipe openings on the two opposite side plates (603) are butted; b. Passing the transverse prestressed tendons (2) through the transverse tendon passing tube (8), applying prestress to both ends of the transverse prestressed tendons (2), so that a firm connection is formed between the cylinders (6); c. injecting grouting material into the transverse reinforcement tube (8), so that the prestressed structure and the cylinder (6) are tightly combined to form a tower ring (1); d. Performing a size inspection and surface cleaning on the tower ring segment (1), hoisting the tower ring segment (1) located at the upper section using a lifting device, docking the convex joint (5) of the tower ring segment (1) located at the upper section with the concave joint (4) of the tower ring segment (1) located at the lower section, and at the same time, passing the limit block (9) through the through hole (14) on the limit block, and installing the limit block (9) in the pre-buried installation pipe (10) of the tower ring segment (1) located at the lower section; and sealing the connection between the two tower ring segments (1); e. After the multi-section tower ring segment (1) is hoisted, the longitudinal prestressed tendons (3) are inserted into the longitudinal tendon tube (7) from top to bottom, and the reserved tail ends of the longitudinal prestressed tendons (3) are fixed using a fixing anchor; f. Apply prestress to the reserved tail end of the longitudinal prestressed tendon (3) for tensioning, inject grouting material into the longitudinal tendon penetration tube (7), and tightly combine the prestressed structure with the cylinder (6). g. After the tensioning is completed, the final test of the tensioning force is carried out, and the tensioning force, tensioning displacement and displacement data of the anchor point are recorded.

6. The method for installing an assembled hollow sandwich steel tube concrete wind power tower according to claim 1, characterized in that: In step a, waterproof sealant is applied to the longitudinal joints of the cylinder for sealing. In step d, waterproof sealant is applied between the two tower ring segments (1) for sealing.

7. The method for installing an assembled hollow sandwich steel tube concrete wind power tower according to claim 1, characterized in that: In step d, a positioning device or a guiding system is used for auxiliary positioning.

8. The method for installing an assembled hollow sandwich steel tube concrete wind power tower according to claim 1, characterized in that: In step e, the longitudinal prestressed tendons (3) are installed with assistance using a traction device or a tendon insertion device.

9. The method for installing an assembled hollow sandwich steel tube concrete wind power tower according to claim 1, characterized in that: In step f, tensioning is performed using a tensioning jack, the tensioning force is gradually increased, and the force value and displacement are monitored at each stage.

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