Internal and external double-cable mixed tower structure and construction method thereof

Abstract

The invention belongs to the technical field of mixed tower structures, and provides a mixed tower structure with inner and outer cables and a construction method thereof. The mixed tower structure comprises a foundation and a concrete tower section arranged on the foundation; the inner prestressed cables are arranged inside the concrete tower sections, the outer prestressed cables are arranged outside the concrete tower sections, the dampers are arranged on the outer prestressed cables, force arms are greatly increased through the outer prestressed cables, under the condition that the using amount of concrete is not changed, the stress performance of the tower drum is improved, the dampers play a role in damping, and the service life of the tower drum is prolonged. Energy generated by vibration of the external prestressed cable can be effectively dissipated, and the influence of wind load on the external prestressed cable is greatly reduced; by adopting the structure of combining the inner cable, the outer cable and the damper, the stress performance of the mixed tower is improved, the cracking risk of the concrete surface can be eliminated, the durability of the structure is greatly improved, and the service life of the structure is greatly prolonged.

Description

Technical Field

[0001] This invention belongs to the field of hybrid tower structure technology, and particularly relates to a hybrid tower structure with internal and external double cables and its construction method. Background Technology

[0002] Wind speed increases significantly with height (wind shear effect). In order to obtain greater power generation, the tower height must be increased. However, the economic and technical aspects of pure steel towers decrease sharply after a certain height.

[0003] Traditional internal cable designs require sufficient prestress to resist the enormous bending moment, necessitating a large number of steel strands. This requires more space for arrangement, which means that the thickness of the concrete tower wall must be increased. Consequently, the amount of concrete used and the self-weight of the tower increase, which not only increases material costs but also increases the foundation load and hoisting difficulty. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a hybrid tower structure with internal and external double cables and its construction method. The external prestressed cables significantly increase the lever arm, improving the tower's load-bearing capacity while maintaining the same amount of concrete. The damper acts as a vibration damper, effectively dissipating the energy generated by the vibration of the external prestressed cables and greatly reducing the impact of wind loads on them. The combination of internal and external double cables and dampers helps improve the load-bearing capacity of the hybrid tower, eliminates the risk of cracking on the concrete surface, and greatly improves the structure's durability and service life.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a hybrid tower structure with inner and outer double cables, employing the following technical solution: A hybrid tower structure with internal and external double cables includes a foundation and a concrete tower section disposed on the foundation. The concrete tower section is equipped with internal prestressed cables; one end of the internal prestressed cable is connected to the foundation, and the other end is connected to the end of the concrete tower section away from the foundation; the concrete tower section is equipped with external prestressed cables; one end of the external prestressed cable is connected to the foundation, and the other end is connected to the end of the concrete tower section away from the foundation; a damper is installed on the external prestressed cable.

[0006] Furthermore, the foundation includes a horizontal segment, a transition segment, and an inclined segment connected sequentially from the inside out; the thickness of the horizontal segment is less than the thickness of the transition segment; and the lower plane of the inclined segment is flush with the lower plane of the transition segment.

[0007] Furthermore, the bottom end of the concrete tower section is located at the connection between the horizontal section and the transition section.

[0008] Furthermore, a concrete platform is provided at the end of the concrete tower section away from the foundation; the two ends of the internal prestressed cable are respectively provided on the concrete platform and the horizontal section; the two ends of the external prestressed cable are respectively provided on the concrete platform and the transition section.

[0009] Furthermore, the damper is located at the upper end face of the foundation.

[0010] Furthermore, the concrete tower section is provided with multiple external prestressed cable clamps at intervals along the height direction, and each prestressed cable clamp holds the external prestressed cable.

[0011] Furthermore, the external prestressed cable clamp includes an inner fixing plate and an outer fixing plate clamping the inner and outer sides of the concrete tower section; the outer fixing plate includes a first clamping plate and a second clamping plate that are joined together, and a through hole is provided between the first clamping plate and the second clamping plate, and the external prestressed cable is extruded and connected in the through hole.

[0012] Furthermore, the through hole includes two semi-circular structures respectively formed on the first clamping plate and the second clamping plate, and the inner diameter of the through hole is smaller than the diameter of the external prestressed cable.

[0013] Furthermore, rock anchor bolts are also installed on the aforementioned foundation.

[0014] To achieve the above objectives, in a second aspect, the present invention also provides a construction method for a hybrid tower structure with both internal and external cables, employing the following technical solution: A construction method for a hybrid tower structure with internal and external double cables, using the hybrid tower structure with internal and external double cables as described in the first aspect, includes: setting a concrete tower segment on a foundation, and setting internal prestressed cables and external prestressed cables on the inner and outer sides of the concrete tower segment respectively.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The concrete tower section of this invention is equipped with internal prestressed cables and external prestressed cables. Dampers are installed on the external prestressed cables. The external prestressed cables greatly increase the lever arm, improving the stress performance of the tower while keeping the amount of concrete constant. The dampers act as vibration dampers, effectively dissipating the energy generated by the vibration of the external prestressed cables and greatly reducing the impact of wind load on the external prestressed cables. The combination of internal and external cables and dampers helps to improve the stress performance of the concrete tower, eliminates the risk of cracking on the concrete surface, and greatly improves the durability and service life of the structure.

[0016] 2. The foundation of this invention is a stepped structure including horizontal sections, transition sections and inclined sections, which reduces the use of the foundation prefabrication materials, increases the connection area and strength with the soil layer, and improves stability.

[0017] 3. The damper of this invention plays a role in vibration reduction, which can effectively dissipate the energy generated by the vibration of the external prestressed cable, greatly reduce the impact of wind load on the external prestressed cable, and the damper is located at the upper end of the foundation. While ensuring the vibration reduction effect, the damper maximizes the increase in lever arm of the external prestressed cable on the concrete tower section.

[0018] 4. In this invention, multiple external prestressed cable clamps are spaced apart along the height direction of the concrete tower section. Each prestressed cable clamp holds the external prestressed cable and fixes the external prestressed cable to the concrete tower section through the prestressed cable clamps, so as to avoid collision with the tower under wind load and damage to the tower, and provide a stable environment for the installation of the damper. Attached Figure Description

[0019] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0020] Figure 1 This is a 1 / 4 cross-sectional view of the mixing tower in Embodiment 1 of the present invention; Figure 2 This is a front view of the mixing tower according to Embodiment 1 of the present invention; Figure 3 As in Embodiment 1 of the present invention Figure 2 External structure of the transition section of the mixed tower in section A; Figure 4 As in Embodiment 1 of the present invention Figure 2 Vibration damping structure at the lower part of the mixed tower in section B; Figure 5 This is a structural diagram of the external prestressed cable clamp of Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of a rock anchor bolt according to Embodiment 1 of the present invention; The components are as follows: 1. Anchor plate; 2. Anchor pad plate; 3. Rock anchor bolt; 31. Flat nut; 32. Double nut; 4. Foundation; 41. Horizontal section; 42. Transition section; 43. Inclined section; 5. Embedded duct; 6. Damper; 7. Concrete tower section; 8. External prestressed cable clamp; 81. Internal fixing plate; 82. External fixing plate; 821. First clamping plate; 822. Second clamping plate; 823. Through hole; 83. Connector; 84. Screw; 85. Nut; 9. External prestressed cable; 10. Internal prestressed cable; 11. Concrete foundation; 12. Steel tower section. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] Example 1: In traditional internal cable systems, prestressing mainly acts inside the tower wall. Under extreme loads, the concrete on the outer surface of the tower wall may still generate tensile stress or even microcracks, which may affect durability in the long run. Controlling the crack width of the concrete is a key design consideration, and a single internal cable system has an upper limit in its ability to control cracks on the outer surface.

[0024] As described in the background section, the inner cable scheme requires sufficient prestress to resist the huge bending moment, which requires a large number of steel strands. This requires more space for arrangement, which means that the thickness of the concrete tower wall must be increased. Consequently, the amount of concrete used and the self-weight of the tower are greater, which not only increases material costs but also increases the foundation load and hoisting difficulty.

[0025] To address at least one of the aforementioned problems, this embodiment provides a hybrid tower structure with internal and external double cables. The use of internal and external double cables helps improve the load-bearing performance of the hybrid tower, eliminates the risk of cracking on the concrete surface, and greatly improves the durability and service life of the structure.

[0026] like Figure 1 As shown, the hybrid tower structure with inner and outer double cables includes anchor plate 1, anchor pad plate 2, rock anchor rod 3, foundation 4, pre-embedded duct 5, damper 6, concrete tower section 7, external prestressed cable clamp 8, external prestressed cable 9, internal prestressed cable 10, concrete foundation 11, and steel tower section 12, etc.

[0027] The foundation 4 comprises a horizontal section 41, a transition section 42, and an inclined section 43 connected sequentially from the inside out. The thickness of the horizontal section 41 is less than the thickness of the transition section 42. The upper surface of the horizontal section 41 is flush with the upper surface of the transition section 42 for installing the concrete tower section 7. The lower surface of the inclined section 43 is flush with the lower surface of the transition section 42. The foundation 4 is configured as a stepped structure including the horizontal section 41, the transition section 42, and the inclined section 43, which reduces the use of prefabricated materials, increases the connection area and strength with the soil layer, and improves stability.

[0028] The bottom end of the concrete tower section 7 is located at the connection between the horizontal section 41 and the transition section 42, which concentrates the force exerted by the concrete tower section 7 on the foundation 4 in the middle, thereby improving stability.

[0029] A concrete foundation 11 is provided at the end of the concrete tower section 7 away from the foundation 4; for example Figure 2 and Figure 3 As shown, a steel tower section 12 is provided on the concrete foundation 11. The two ends of the internal prestressing cable 10 are respectively located on the concrete foundation 11 and the horizontal section 41, further concentrating the force exerted by the concrete tower section 7 on the foundation 4 towards the center. The two ends of the external prestressing cable 9 are respectively located on the concrete foundation 11 and the transition section 42. It can be understood that multiple internal prestressing cables 10 and external prestressing cables 9 are uniformly arranged circumferentially on the concrete tower section 7.

[0030] like Figure 2 and Figure 4 As shown, the damper 6 acts as a vibration reducer, effectively dissipating the energy generated by the vibration of the external prestressed cable 9, greatly reducing the impact of wind load on the external prestressed cable 9. The presence of the external prestressed cable 9 can greatly increase the lever arm, meaning that sufficient bending moment resistance can be provided with less prestressed material. With the same amount of concrete, it greatly improves the stress performance of concrete and can also increase the height of the tower while ensuring stress performance, improving structural efficiency and material utilization. The external prestressed cable 9 can significantly improve the overall stiffness of the tower, resulting in an increase in the first natural frequency of the structure, effectively reducing the risk of resonance and improving the stability and safety of wind turbine operation.

[0031] The damper 6 is located at the upper end face of the foundation 4, maximizing the increase in lever arm of the external prestressed cable 9 on the concrete tower section 7 while ensuring vibration damping. The damper 6 can be an elastic element such as a spring. Optionally, the external prestressed cable 9 is divided into two sections, with the damper 6 located between the two sections; one section of the external prestressed cable 9 is located on the outside of the concrete tower section 7, and the other section passes through the pre-embedded channel 5 reserved on the concrete tower section 7 and is fixed to the bottom of the foundation by anchor plates 1 and anchor pads 2.

[0032] like Figure 1 and Figure 5 As shown, the concrete tower section 7 is provided with multiple external prestressed cable clamps 8 at intervals along its height, each clamp holding the external prestressed cable 9. The concrete tower section 7 is provided with a prestressed cable clamp 8 at regular intervals along its height, which secures the external prestressed cable 9 to the concrete tower section 7, preventing collisions with the tower under wind loads and thus avoiding damage to the tower, while providing a stable environment for the installation of the damper 6.

[0033] The external prestressed cable clamp 8 includes an inner fixing plate 81 and an outer fixing plate 82 clamping the inner and outer sides of the concrete tower section 7; a connector 83 is provided between the inner fixing plate 81 and the outer fixing plate 82, and the connector 83 can be a bolt or other connecting component. The outer fixing plate 82 includes a first clamping plate 821 and a second clamping plate 822 mating together, and the first clamping plate 821 and the second clamping plate 822 are connected by a screw 84 and a nut 85; a through hole 823 is provided between the first clamping plate 821 and the second clamping plate 822, and the external prestressed cable 9 is extruded and connected in the through hole 823; it is understood that the through hole 823 includes two semi-circular structures respectively opened on the first clamping plate 821 and the second clamping plate 822, and the inner diameter of the through hole 823 is smaller than the diameter of the external prestressed cable 9.

[0034] like Figure 1 and Figure 6 As shown, a rock anchor 3 is also provided on the horizontal section 41; the rock anchor 3 is provided with a flat nut 31 and a double nut 32. The rock anchor 3 improves the pull-out resistance.

[0035] Understandably, in rocky and soil areas, the inner prestressed cable 10 of the double-cable structure is connected to the top of the concrete section 7 via an anchor plate at the top and to the foundation 4 via an anchor plate at the bottom. The outer prestressed cable 9 is divided into two sections. The upper part is connected to the concrete foundation 11 via an anchor plate and the middle part is connected to the damper 6. The lower part passes through the pre-set channel 5 and is fixed to the lower part of the foundation 4 via the anchor pad 2 and the anchor plate 1. Rock anchor rods 3 are provided to balance part of the tension of the prestressed cable. The construction of the rock anchor rod 3 adopts the process of drilling, cleaning the hole, grouting, and screwing in the anchor rod to penetrate the rock layer, which greatly improves the pull-out resistance and achieves a better stress effect.

[0036] Example 2: This embodiment provides a construction method for a hybrid tower structure with internal and external double cables, using the hybrid tower structure with internal and external double cables as described in Embodiment 1, including: setting a concrete tower segment 7 on a foundation 4, and setting an internal prestressed cable 10 and an external prestressed cable 9 on the inner and outer sides of the concrete tower segment 7 respectively.

[0037] The external prestressing cable 9 in this embodiment significantly increases the lever arm, improving the tower's stress performance while maintaining the same amount of concrete. This results in high structural efficiency and good economy. It also exhibits excellent crack resistance, greatly improving the structure's durability and service life. The external prestressing cable 9 significantly enhances the overall stiffness of the tower, substantially optimizing dynamic performance, effectively reducing resonance risk, and improving the wind turbine's operational stability and safety. The damper 6 effectively dissipates some energy, reducing the impact of wind loads on the external cable. The external prestressing cable clamp 8 divides the external prestressing cable 9 into multiple segments, preventing collisions between the external cable and the tower, further ensuring safety during use.

[0038] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A hybrid tower structure with inner and outer double cables, characterized in that, This includes the foundation and the concrete tower section set on the foundation; The concrete tower section is equipped with internal prestressed cables; one end of the internal prestressed cable is connected to the foundation, and the other end is connected to the end of the concrete tower section away from the foundation; the concrete tower section is equipped with external prestressed cables; one end of the external prestressed cable is connected to the foundation, and the other end is connected to the end of the concrete tower section away from the foundation; a damper is installed on the external prestressed cable.

2. The hybrid tower structure with inner and outer double cables as described in claim 1, characterized in that, The foundation comprises a horizontal section, a transition section, and an inclined section connected sequentially from the inside out; the thickness of the horizontal section is less than the thickness of the transition section; and the lower plane of the inclined section is flush with the lower plane of the transition section.

3. A hybrid tower structure with inner and outer double cables as described in claim 2, characterized in that, The bottom end of the concrete tower section is located at the junction of the horizontal section and the transition section.

4. A hybrid tower structure with inner and outer double cables as described in claim 2, characterized in that, A concrete platform is provided at the end of the concrete tower section away from the foundation; the two ends of the internal prestressed cable are respectively provided on the concrete platform and the horizontal section; the two ends of the external prestressed cable are respectively provided on the concrete platform and the transition section.

5. A hybrid tower structure with inner and outer double cables as described in claim 1, characterized in that, The damper is located at the upper end face of the foundation.

6. A hybrid tower structure with inner and outer double cables as described in claim 1, characterized in that, The concrete tower section is provided with multiple external prestressed cable clamps at intervals along the height direction, and each prestressed cable clamp holds the external prestressed cable.

7. A hybrid tower structure with inner and outer double cables as described in claim 1, characterized in that, The external prestressed cable clamp includes an inner fixing plate and an outer fixing plate clamping the inner and outer sides of the concrete tower section; the outer fixing plate includes a first clamping plate and a second clamping plate that are joined together, and a through hole is provided between the first clamping plate and the second clamping plate, and the external prestressed cable is extruded and connected in the through hole.

8. A hybrid tower structure with inner and outer double cables as described in claim 7, characterized in that, The through hole includes two semi-circular structures respectively opened on the first clamping plate and the second clamping plate, and the inner diameter of the through hole is smaller than the diameter of the external prestressed cable.

9. A hybrid tower structure with inner and outer double cables as described in claim 1, characterized in that, Rock anchors are also installed on the basis described above.

10. A construction method for a hybrid tower structure with internal and external double cables, characterized in that, The hybrid tower structure using the inner and outer double cable as described in any one of claims 1-9 includes: setting a concrete tower section on a foundation, and setting an inner prestressed cable and an outer prestressed cable on the inner and outer sides of the concrete tower section, respectively.

Images