Sectional prestressed concrete tower transition section switching mechanism

Abstract

The utility model discloses a transition section switching mechanism for a segmented prestressed concrete tower, which relates to the technical field of fan construction and comprises a tower foundation platform, a concrete tower section, a steel tower, a steel-concrete transition component and a steel transition component. The concrete tower section is mounted on the tower foundation platform, and the reinforced concrete transition assembly comprises a concrete transition cylinder section, a steel base plate and a steel strand pre-buried hole; the steel transition assembly comprises a steel transition cylinder section, an upper flange plate, a lower flange plate, a transition platform, a pre-perforated hole and a prestressed steel strand bundle, and the transition platform is connected with the steel-concrete transition cylinder section; the concrete transition cylinder sections are connected with the concrete tower sections, the steel transition cylinder sections are connected with the steel tower, and the concrete transition cylinder sections and the steel transition cylinder sections are connected with the tower foundation platform through the prestressed steel strand bundles, so that the multiple groups of concrete tower sections and the steel tower are connected into a whole, and the concrete tower is uniform in stress; the anti-cracking performance of the concrete tower section is improved, and the concrete tower section is prevented from cracking in the operation process of the draught fan.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine construction technology, specifically to a transition section conversion mechanism for a segmented prestressed concrete tower. Background Technology

[0002] my country possesses abundant wind resources, and wind power generation has become a crucial component of the country's total electricity generation, serving as an important measure for green and sustainable development. In recent years, my country's wind power industry has experienced rapid growth, with tower heights increasing from 90m to over 140m. However, when tower height exceeds 90m, traditional pure steel towers are no longer sufficient (excessive height lowers the natural frequency of the steel tower, leading to resonance with the rotor rotation). Hybrid towers (upper steel tower, lower concrete tower) possess a higher natural frequency, thus meeting safety requirements and offering advantages in transportation and installation.

[0003] The traditional transition section connection device between the existing concrete tower section and the steel tower section uses concrete pre-embedded bolts and anchor steel plates for tightening. Due to the large spacing between the bolt installation positions, the stress in the concrete tower is uneven. During the operation of the wind turbine, tensile stress is continuously generated on the concrete tower wall, which can cause cracking of the concrete tower in severe cases. Its crack resistance cannot be guaranteed, affecting the overall service life of the tower. Utility Model Content

[0004] The main purpose of this utility model is to provide a transition section conversion mechanism for segmented prestressed concrete towers, which solves the problem of uneven stress in the concrete tower caused by the existing connection between the concrete tower section and the steel tower section by bolts.

[0005] To achieve the above objectives, this utility model provides a segmented prestressed concrete tower transition section conversion mechanism, including a tower foundation platform, a concrete tower section, and a steel tower, wherein the concrete tower section is installed on the tower foundation platform; and further includes:

[0006] The steel-concrete transition component includes a concrete transition cylinder section and a steel pad plate set on the concrete transition cylinder section; the concrete transition cylinder section is provided with steel strand embedded holes inside, and a bottom positioning hole is provided at the bottom end of the concrete transition cylinder section; the concrete transition cylinder section is connected to the concrete tower section through the bottom plate positioning hole; and a hoisting embedded part is provided inside the concrete transition cylinder section.

[0007] A steel transition assembly includes a steel transition cylinder section, an upper flange and a lower flange disposed at both ends of the steel transition cylinder section; a transition platform is provided inside the steel transition cylinder section; a connection hole is provided on the upper flange; a pre-piercing hole is provided on the lower flange; the transition platform is connected to the steel-concrete transition cylinder section; a connector is provided between the steel transition cylinder section and the steel transition section to make the pre-piercing hole and the pre-embedded hole of the steel strand concentric; a prestressed steel strand bundle penetrating the pre-embedded hole of the steel strand and the tower foundation platform is provided in the pre-piercing hole.

[0008] As a further improvement of this utility model, the outer wall thickness of the concrete transition cylinder section is greater than the outer wall thickness of the concrete tower section, so that the extension line of the axis of the steel strand pre-embedded hole is located inside the concrete tower section.

[0009] As a further improvement of this utility model, the connecting member includes positioning holes spaced apart at the top of the steel pad; positioning pins are detachably provided in the top positioning holes; positioning pin holes are spaced apart at the bottom end of the steel transition cylinder section, and the steel transition cylinder section is connected to the positioning pins through the positioning pin holes and installed on the steel pad.

[0010] As a further improvement of this utility model, the width of the steel pad is greater than the width of the lower flange, and the end face of the steel pad near the center of the concrete transition cylinder section is provided with a connecting screw hole; the transition platform is installed on the steel pad by double-ended studs.

[0011] As a further improvement of this utility model, a friction plate is provided between the prestressed steel strand bundle and the inner wall of the concrete tower section; the axis of the friction plate is parallel to the axis of the pre-embedded hole of the steel strand.

[0012] The beneficial effects of this utility model are reflected in:

[0013] By setting up concrete transition sections and steel transition sections, connecting the concrete transition sections to the concrete tower sections, connecting the steel transition sections to the steel tower, and connecting the concrete transition sections, steel transition sections, and tower foundation platforms with prestressed steel strand bundles, multiple sets of concrete tower sections and steel towers are connected into a whole. This ensures uniform stress in the concrete tower, improves the crack resistance of the concrete tower sections, and prevents cracking of the concrete tower sections during wind turbine operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a transition section conversion mechanism for a segmented prestressed concrete tower according to the present invention.

[0015] Figure 2 This is a schematic diagram of the internal structure of a transition section conversion mechanism for a segmented prestressed concrete tower according to the present invention.

[0016] Figure 3This is a schematic diagram of the tower foundation platform structure of a segmented prestressed concrete tower transition section conversion mechanism according to the present invention;

[0017] Figure 4 This is a schematic diagram of the connection structure between the concrete transition cylinder section and the steel transition cylinder section of a segmented prestressed concrete tower transition section conversion mechanism according to this utility model.

[0018] Figure 5 This is a schematic diagram of the connection structure between the transition platform and the concrete transition cylinder section of a segmented prestressed concrete tower transition section conversion mechanism according to this utility model.

[0019] Figure 6 This is a schematic diagram of the concrete transition cylinder section structure of a segmented prestressed concrete tower transition section conversion mechanism according to this utility model;

[0020] Figure 7 This is a schematic diagram of the steel transition cylinder section structure of a segmented prestressed concrete tower transition section conversion mechanism according to this utility model;

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Tower foundation platform; 101. Foundation plate; 102. Conduit; 103. Mounting groove; 2. Concrete tower section; 3. Steel tower; 4. Concrete transition tube section; 5. Steel pad; 6. Steel strand embedded hole; 7. Bottom positioning hole; 8. Hoisting embedded part; 801. Embedded bolt hole; 802. Connector; 9. Steel transition tube section; 10. Upper flange; 11. Lower flange; 12. Transition platform; 13. Connecting hole; 14. Pre-drilled hole; 15. Connector; 16. Prestressed steel strand bundle; 17. Top positioning hole; 18. Positioning pin; 19. Positioning pin hole; 20. Connecting bolt hole; 21. Double-ended stud; 22. Through hole; 23. Nut; 24. Friction plate; 25. Anchor plate; 26. Protective cover; 27. Cable clamp; 28. Shock absorber. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] In one embodiment, see Figure 1 , 4The present invention relates to a segmented prestressed concrete tower transition section conversion mechanism, comprising a tower foundation platform 1, a concrete tower section 2, a steel tower 3, a steel-concrete transition component, and a steel transition component.

[0025] The concrete tower section 2 is installed on the tower foundation platform 1. The steel-concrete transition assembly includes a concrete transition cylinder section 4 and a steel pad 5 set on the concrete transition cylinder section 4. The concrete transition cylinder section 4 has steel strand pre-embedded holes 6 inside and a bottom positioning hole 7 at the bottom end. The concrete transition cylinder section 4 is connected to the concrete tower section 2 through the bottom plate positioning hole. The concrete transition cylinder section 4 has a hoisting pre-embedded part 8 inside. The steel transition assembly includes a steel transition cylinder section 9, an upper flange 10 and a lower flange 11 set at both ends of the steel transition cylinder section 9. The steel transition cylinder section 9 has a transition platform 12 inside. The upper flange 10 has a connection hole 13, and the lower flange 11 has a pre-penetration hole 14. The transition platform 12 is connected to the steel-concrete transition cylinder section. A connector 15 is provided between the steel transition cylinder section 9 and the steel transition section to make the pre-penetration hole 14 concentric with the steel strand pre-embedded hole 6. The pre-penetration hole 14 has a prestressed steel strand bundle 16 that penetrates the steel strand pre-embedded hole 6 and the tower foundation platform 1.

[0026] Preferred, see Figure 2 The tower foundation platform 1 is provided with a foundation plate 101, the foundation plate 101 is provided with a conduit 102, the tower foundation platform 1 is provided with an installation groove 103, the concrete tower section 2 is installed in the installation groove 103 and filled with grout.

[0027] Further, see Figure 1 , 3 The outer wall thickness of the concrete transition cylinder section 4 is greater than that of the outer wall thickness of the concrete tower section 2, so that the extension line of the axis of the steel strand pre-embedded hole 6 is located inside the concrete tower section 2.

[0028] Preferably, multiple sets of pre-embedded holes 6, pre-pierced holes 14, and conduit 102 are arranged at intervals along the circumference of the tower foundation platform 1.

[0029] Preferably, the hoisting embedded part 8 is a pre-embedded screw hole 801 set on the inner wall of the concrete transition cylinder section 4, and the pre-embedded screw hole 801 is provided with a connector 802 that can be detached by thread.

[0030] Further, see Figure 5 , 7 The connector 15 includes top positioning holes 17 spaced apart on the steel pad 5, and positioning pins 18 are detachably provided in the top positioning holes 17. Positioning pin holes 19 are spaced apart at the bottom end of the steel transition cylinder section 9. The steel transition cylinder section 9 is connected to the positioning pins 18 through the positioning pin holes 19 and is installed on the steel pad 5.

[0031] Preferably, one end of the positioning pin 18 is inserted into the top positioning hole 17, and the other end is conical and inserted into the positioning pin hole 19.

[0032] In the above setup, after connecting the concrete transition cylinder section 4 to the concrete tower section 2, ensure that the pre-embedded hole 6 of the steel strand and the conduit 102 are concentric. Hoist the steel transition cylinder section 9 above the concrete transition cylinder section 4, adjust the positioning pin hole 19 on the steel transition cylinder section 9 to align with the positioning pin 18, and connect the positioning pin hole 19 with the positioning pin 18 to install the steel transition cylinder section 9 on the concrete transition cylinder section 4, and ensure that the pre-embedded hole 6 of the steel strand and the conduit are concentric.

[0033] Further, see Figure 6 The width of the steel pad 5 is greater than the width of the lower flange 11. The end face of the steel pad 5 near the center of the concrete transition cylinder section 4 is provided with a connecting bolt hole 20. The transition platform 12 is installed on the steel pad 5 by a double-headed stud 21.

[0034] Preferably, the transition platform 12 is provided with a through hole 22, one end of the double-ended stud 21 passes through the through hole 22 and is threadedly connected to the connecting screw hole 20, and the other end is connected to the transition platform 12 through a nut 23.

[0035] Further, see Figure 2 A friction plate 24 is provided between the prestressed steel strand bundle 16 and the inner wall of the concrete tower section 2, and the axis of the friction plate 24 is parallel to the axis of the steel strand pre-embedded hole 6.

[0036] Preferably, the friction plate 24 is bonded to the inner wall of the concrete tower.

[0037] Preferably, the ends of the prestressed steel strand bundles 16 that pass through the pre-piercing holes 14 and the ends that pass through the threading holes are respectively provided with anchor plates 25, and protective covers 26 are provided on the anchor plates 25. Cable clamps 27 are provided on the prestressed steel strand bundles 16 below the concrete transition cylinder section 4, and shock absorbers 28 are provided between the prestressed steel strand bundles 16.

[0038] In the above setup, the transition platform 12 is connected to the concrete transition cylinder section 4 by double-headed studs 21. The transition platform 12 is located at the lower flange and provides an operating base platform for the steel transition cylinder section 9. The friction plate 24 can separate the prestressed steel strand bundle 16 from the inner wall of the concrete tower section 2 during the installation of the prestressed steel strand bundle 16, thus preventing the outer wall of the prestressed steel strand bundle 16 from being damaged by friction.

[0039] In this embodiment, after the concrete transition section 4 and the concrete tower section 2 are hoisted and connected, the surface of the steel pad 5 is cleaned, and sealant is applied to both sides of the steel strand pre-embedded hole 6 on the steel pad 5. After the steel transition section 9 is hoisted, the construction platform inside the concrete tower section 2 is hoisted out first. After the ground transition platform 12 is leveled, it is hoisted into the steel transition section 9 for installation. Finally, the prestressed steel strand bundle 16 is threaded through the pre-piercing hole 14, the steel strand pre-embedded hole 6, and the threading hole, and the prestressed steel strand bundle 16 is tightened and the two ends are fixed. The shock absorber 28 is installed. The steel tower 3 and the steel transition section are connected by high-strength bolts passing through the connecting hole 13.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A transition mechanism for a segmented prestressed concrete tower, comprising a tower foundation platform (1), a concrete tower section (2), and a steel tower (3), wherein the concrete tower section (2) is installed on the tower foundation platform (1); characterized in that, Also includes: The steel-concrete transition component includes a concrete transition cylinder section (4) and a steel pad plate (5) set on the concrete transition cylinder section (4); the concrete transition cylinder section (4) is provided with steel strand pre-embedded holes (6) inside, the bottom end of the concrete transition cylinder section (4) is provided with bottom positioning holes (7), the concrete transition cylinder section (4) is connected to the concrete tower section (2) through the bottom plate positioning holes, and the concrete transition cylinder section (4) is provided with hoisting pre-embedded parts (8) inside. The steel transition assembly includes a steel transition cylinder section (9), an upper flange (10) and a lower flange (11) disposed at both ends of the steel transition cylinder section (9); a transition platform (12) is provided inside the steel transition cylinder section (9); a connecting hole (13) is provided on the upper flange (10); a pre-piercing hole (14) is provided on the lower flange (11); the transition platform (12) is connected to the steel-concrete transition cylinder section; a connector (15) is provided between the steel transition cylinder section (9) and the steel transition section to make the pre-piercing hole (14) concentric with the steel strand pre-embedded hole (6); a prestressed steel strand bundle (16) penetrating the steel strand pre-embedded hole (6) and the tower foundation platform (1) is provided inside the pre-piercing hole (14).

2. The transition section conversion mechanism for a segmented prestressed concrete tower according to claim 1, characterized in that: The outer wall thickness of the concrete transition cylinder section (4) is greater than the outer wall thickness of the concrete tower section (2) so that the extension line of the axis of the steel strand pre-embedded hole (6) is located inside the concrete tower section (2).

3. The transition section conversion mechanism for a segmented prestressed concrete tower according to claim 2, characterized in that: The connector (15) includes top positioning holes (17) spaced apart on the steel pad (5); positioning pins (18) are detachably provided in the top positioning holes (17); positioning pin holes (19) are spaced apart at the bottom end of the steel transition cylinder section (9), and the steel transition cylinder section (9) is connected to the positioning pins (18) through the positioning pin holes (19) and installed on the steel pad (5).

4. The transition section conversion mechanism for a segmented prestressed concrete tower according to claim 3, characterized in that: The width of the steel pad (5) is greater than the width of the lower flange (11). The end face of the steel pad (5) near the center of the concrete transition cylinder section (4) is provided with a connecting screw hole (20). The transition platform (12) is installed on the steel pad (5) by a double-headed stud (21).

5. The transition section conversion mechanism for a segmented prestressed concrete tower according to claim 4, characterized in that: A friction plate (24) is provided between the prestressed steel strand bundle (16) and the inner wall of the concrete tower section (2); the axis of the friction plate (24) is parallel to the axis of the steel strand pre-embedded hole (6).

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