Fragmented steel-concrete composite structure transition section for lattice type tower

Abstract

The utility model provides a fragmented steel-concrete composite structure transition section for a lattice type tower, which comprises two groups of fragmented structures which are oppositely arranged, two ends of the two groups of fragmented structures are connected through connecting components, each fragmented structure comprises a combined cavity, an outer steel shell, an inner steel shell cylinder, a top steel plate and a bottom steel plate, the inner steel shell barrel is arranged on the inner side of the outer steel shell, the top steel plate and the bottom steel plate are arranged on the tops and the bottoms of the inner steel shell barrel and the outer steel shell respectively and welded to the tops and the bottoms of the inner steel shell barrel and the outer steel shell to form a cavity, lattice type tower frame corner columns communicated with the combined cavity are arranged at the bottom of the combined cavity, and a concrete pouring body is arranged in the combined cavity. And the concrete pouring body is filled in an inner cavity of the lattice type tower corner post. The structure is simple in transmission and clear in stress, the compression resistance of the transition section can be remarkably improved, meanwhile, the risk of buckling of the combined cavity can be avoided, and the phenomenon that stress is concentrated when the stress of the upper steel tower is transmitted to the lower lattice section to be transmitted can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, in particular to a piecewise steel-concrete composite structure transition section for a lattice tower. Background Art

[0002] The prestressed steel tube concrete lattice tower consists of a pure steel structure tower at the top, a steel-concrete composite transition section in the middle, and prestressed steel tube concrete lattice columns at the bottom. This transforms the bending mode of a single member into an axial force mode for the corner column members, fully leveraging the advantages of steel tube concrete structures in high-rise structures: high bearing capacity and high lateral stiffness. Furthermore, the lattice column material is located in the corner column, far from the neutral axis, and has a high material strength utilization rate, thus saving material and improving stiffness. Simultaneously, the application of prestressing forces compresses the entire concrete cross-section, and the vertical steel tube connection flanges and bolts are always under pressure. The use of prestressing reduces the average stress under fatigue load at the lattice tower nodes, thereby improving fatigue life. This also has good feasibility and economic benefits.

[0003] During the design process, the connection between the lattice section and the steel tower is crucial. How to transfer the large concentrated loads and bending moments from the upper section to the lower lattice section is a crucial consideration during the transition section design process. The primary function of the transition section is to effectively transfer the load from the upper steel tower tube to the four lower lattice corner columns, which are subject to large concentrated loads and complex forces. Traditional transition sections used in lattice towers have low compressive performance, and stress concentration occurs when the forces from the upper steel tower are transferred to the lower lattice section. Supported solely by the steel shell, this poses a risk of buckling, resulting in poor overall structural stability. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model proposes a segmented steel-concrete composite structure transition section for a lattice tower to solve the technical problems proposed in the above background technology, such as the low compressive performance of the traditional transition section for the lattice tower, the stress concentration phenomenon when the force of the upper steel tower is transmitted to the lower lattice section, the risk of buckling of the steel shell caused by the support only by the steel shell, and the poor stability of the overall structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a segmented steel-concrete composite structure transition section for a lattice tower, comprising two sets of segmented structures arranged opposite to each other, both ends of the two sets of segmented structures being connected by a connecting assembly, the segmented structures comprising:

[0006] A combined cavity, comprising an outer steel shell, an inner steel shell cylinder, a top steel plate and a bottom steel plate, wherein the inner steel shell cylinder is arranged inside the outer steel shell, and the top steel plate and the bottom steel plate are respectively arranged on the top and bottom of the inner steel shell cylinder and the outer steel shell and welded thereto to form a cavity;

[0007] a lattice tower corner column, disposed at the bottom of the combined cavity and in communication therewith, and connected to the tower; and

[0008] The concrete casting body is arranged in the combined cavity and fills the internal cavity of the lattice tower corner column.

[0009] Furthermore, the connection assembly includes two groups of relatively arranged special-shaped flanges, the two groups of special-shaped flanges are respectively welded and fixed to the ends of the two groups of combined cavities, and the two groups of special-shaped flanges are connected by high-strength bolts.

[0010] Furthermore, a plurality of groups of first reinforcing ribs are evenly distributed at the connection between the special-shaped flange and the outer steel shell and the inner steel shell cylinder.

[0011] Furthermore, a top flange is welded and fixed to the top of the combined cavity, and a bottom flange is welded and fixed to the bottom of the lattice tower corner column.

[0012] Furthermore, a plurality of groups of second reinforcing ribs are circumferentially arranged at the connection between the bottom flange and the lattice tower corner column.

[0013] Furthermore, multiple groups of studs are arranged on the cavity side of the outer steel shell and the inner steel shell cylinder, and the studs are embedded in the concrete casting body, and the spacing between the studs is 100 mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] When the transition section is in use, the segmented combined cavity makes the transportation and installation of the transition section more convenient, meeting the road transportation restriction requirements. After being transported to the construction area, the two groups of segmented structures are fixedly connected by connecting components, and the lattice tower corner column is fixedly connected to the tower. The upper tower is supported by the transition section, and the concrete casting body is filled into the combined cavity, and the concrete casting body fills the internal cavity of the lattice tower corner column. This structure has simple transmission and clear force, which can significantly improve the compressive performance of the transition section. At the same time, it can avoid the risk of buckling of the inner steel shell cylinder and the outer steel shell, and can effectively solve the stress concentration phenomenon when the force of the upper steel tower is transmitted to the lower lattice section, thereby improving the stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1A schematic diagram of the three-dimensional structure of a segmented steel-concrete composite structure transition section for a lattice tower provided by the utility model;

[0018] Figure 2 This is a schematic diagram of a segmented structure in a transition section of a segmented steel-concrete composite structure for a lattice tower according to the present invention;

[0019] Figure 3 The utility model is a structural schematic diagram of a butt flange in a transition section of a segmented steel-concrete composite structure used in a lattice tower.

[0020] Reference numerals:

[0021] 1. Combined cavity; 2. Outer steel shell; 3. Inner steel shell cylinder; 4. Lattice tower corner column; 5. Special-shaped flange; 51. First reinforcing rib; 6. Bottom flange; 61. Second reinforcing rib; 7. Top flange; 8. Top steel plate; 9. Bottom steel plate; 10. Concrete casting body. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technicians in this field can make some non-essential improvements and adjustments to the present invention based on the above application content.

[0023] Example:

[0024] like Figure 1 、 2 As shown, the utility model provides a segmented steel-concrete composite structure transition section for a lattice tower, comprising two groups of relatively arranged segmented structures, both ends of which are connected by a connecting assembly, and the segmented structure includes a combined cavity 1. The combined cavity 1 includes an outer steel shell 2, an inner steel shell cylinder 3, a top steel plate 8, and a bottom steel plate 9. The inner steel shell cylinder 3 is arranged on the inner side of the outer steel shell 2, and the top steel plate 8 and the bottom steel plate 9 are respectively arranged on the top and bottom of the inner steel shell cylinder 3 and the outer steel shell 2 and welded thereto to form a cavity. A lattice tower corner column 4 is arranged at the bottom of the combined cavity 1, and the lattice tower corner column 4 is connected to the tower. A concrete casting 10 is cast in the combined cavity 1, and the concrete casting 10 fills the internal cavity of the lattice tower corner column 4.

[0025] Among them, the connection between the outer steel shell 2, the inner steel shell cylinder 3, the top steel plate 8 and the bottom steel plate 9 is fixed by welding. The transition section adopts a steel-concrete composite structure, which puts the transition section in a three-way compression state, significantly improving the compressive performance of the concrete casting body 10. At the same time, it can prevent the outer steel shell 2 and the inner steel shell cylinder 3 from buckling. In order to ensure a good connection between the concrete casting body 10 and the steel, studs are welded on the outer steel shell 2 and the inner steel shell cylinder 3, and the stud spacing is 100mm.

[0026] like Figure 2 、 3 As shown, in this embodiment, the connection assembly includes two sets of oppositely arranged special-shaped flanges 5, which are welded to the ends of the two combined cavities 1 and connected by high-strength bolts. To meet road transportation restrictions, the transition section is divided into two pieces. After arriving at the wind farm, the special-shaped flanges 5 at the ends of the piece-by-piece structure are connected to form a whole. The special-shaped flanges 5 are forged using a piece-by-piece normalizing method to ensure the required flange flatness accuracy. Multiple sets of first reinforcing ribs 51 are evenly distributed at the connection between the special-shaped flanges 5 and the outer steel shell 2 and the inner steel shell cylinder 3 to ensure the rigidity and stability of the piece-by-piece structure.

[0027] like Figure 1 、 2 As shown, in this embodiment, a top flange 7 is welded to the top of the combined cavity 1, and a bottom flange 6 is welded to the bottom of the lattice tower corner column 4. Multiple sets of second reinforcing ribs 61 are arranged circumferentially at the connection between the bottom flange 6 and the lattice tower corner column 4. The top flange 7 connects the upper tower barrel, while the bottom flange 6 connects the lower tower. Metal gaskets can be applied to the bottom of the bottom flange 6 to ensure horizontal deviation during installation. The second reinforcing ribs 61 serve to increase the rigidity and stability of the connection between the bottom flange 6 and the lattice tower corner column 4. It will be appreciated that in some embodiments, the first and second reinforcing ribs 51, 61 can be fabricated from Q235B steel plates.

[0028] Specific usage and beneficial effects of this utility model:

[0029] When the transition section is in use, the segmented combined cavity 1 makes the transportation and installation of the transition section more convenient, meeting the road transportation restriction requirements. After being transported to the construction area, the two groups of segmented structures are fixedly connected by the special-shaped flange 5 in combination with high-strength bolts, and the lattice tower corner column 4 is fixedly connected to the tower. The upper tower is supported by the transition section, and the concrete casting body 10 is filled into the combined cavity 1, and the concrete casting body 10 fills the internal cavity of the lattice tower corner column 4. This structure has simple transmission and clear force, which can significantly improve the compressive performance of the transition section. At the same time, it can avoid the risk of buckling of the inner steel shell cylinder 3 and the outer steel shell 2, and can effectively solve the stress concentration phenomenon when the force of the upper steel tower is transmitted to the lower lattice section, thereby improving the stability of the structure.

[0030] The above shows and describes the basic principles, main features, and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments. It is obvious to those skilled in the art that modifications or improvements can be made based on the present invention. Therefore, such modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A segmented steel-concrete composite structure transition section for a lattice tower, characterized in that: The invention comprises two groups of slice structures arranged opposite to each other, both ends of the two groups of slice structures are connected by a connecting component, and the slice structures include: A combined cavity (1) comprises an outer steel shell (2), an inner steel shell cylinder (3), a top steel plate (8) and a bottom steel plate (9), wherein the inner steel shell cylinder (3) is arranged inside the outer steel shell (2), and the top steel plate (8) and the bottom steel plate (9) are respectively arranged at the top and bottom of the inner steel shell cylinder (3) and the outer steel shell (2) and welded thereto to form a cavity; Lattice tower corner columns (4) are arranged at the bottom of the combined cavity (1) and communicated with it, and are connected to the tower; and A concrete casting body (10) is arranged in the combined cavity (1) and fills the internal cavity of the lattice tower corner column (4).

2. The segmented steel-concrete composite structure transition section for a lattice tower according to claim 1, characterized in that: The connection assembly comprises two sets of oppositely arranged special-shaped flanges (5), the two sets of special-shaped flanges (5) are respectively welded and fixed to the ends of the two sets of combined cavities (1), and the two sets of special-shaped flanges (5) are connected by high-strength bolts.

3. The segmented steel-concrete composite structure transition section for a lattice tower according to claim 2, characterized in that: A plurality of groups of first reinforcing ribs (51) are evenly distributed at the connection points between the special-shaped flange (5), the outer steel shell (2) and the inner steel shell cylinder (3).

4. The segmented steel-concrete composite structure transition section for a lattice tower according to claim 1, characterized in that: A top flange (7) is welded and fixed to the top of the combined cavity (1), and a bottom flange (6) is welded and fixed to the bottom of the lattice tower corner column (4).

5. The segmented steel-concrete composite structure transition section for a lattice tower according to claim 4, characterized in that: A plurality of groups of second reinforcing ribs (61) are arranged circumferentially at the connection between the bottom flange (6) and the lattice tower corner column (4).

6. The segmented steel-concrete composite structure transition section for a lattice tower according to claim 1, characterized in that: The outer steel shell (2) and the inner steel shell cylinder (3) are both arranged with multiple groups of studs on the cavity side, and the studs are embedded in the concrete casting body (10), and the spacing between the studs is 100 mm.

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