Hollow interlayer concrete segment prestressed column

Abstract

The invention discloses a hollow interlayer concrete segment prestressed column, and belongs to the technical field of land wind power generation, the hollow interlayer concrete segment prestressed column comprises a multi-section column of a hollow structure, the column comprises an outer steel pipe and two inner steel pipes, a middle corrugated steel pipe is arranged between the two inner steel pipes, and the middle corrugated steel pipe is sleeved with a spiral steel plate; a space formed by the outer steel pipe, the spiral steel plate and the middle corrugated steel pipe is filled with a first concrete structure body, the upper end and the lower end of the first concrete structure body are each provided with an annular partition plate, and a second concrete structure body pre-cast for the second time is arranged between the annular partition plates and the outer steel pipe. The mode that external prestressing and internal prestressing are combined is adopted, the external prestressing ensures that the overall stress of the stand column is stable, the internal prestressing ensures that the concrete cannot crack, the safety of the tower is improved, the combining quality between the concrete and the steel pipe is better controlled, and the service life of the tower is prolonged. Therefore, reliable combination between the concrete and the inner and outer steel pipes is ensured, and the occurrence probability of potential safety hazards is reduced.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of onshore wind power generation, and in particular to a hollow sandwich concrete segment prestressed column. Background Art

[0002] Today, with environmental pollution and greenhouse gas emissions becoming increasingly serious, wind power generation is currently recognized worldwide as an effective solution to mitigate climate change, improve energy security, and promote low-carbon economic growth. Onshore wind power generation technology is a technology that uses wind resources on the earth's surface to convert wind energy into electrical energy through wind turbines. It has high cost-effectiveness and resource effectiveness. The basic components of onshore wind power generation technology are wind turbines, towers, electrical equipment and foundations. Wind turbines are the core part of wind power generation systems, usually including blades, hubs, generators, gearboxes and control systems. Towers are used to support turbine blades and generators, and their height is usually from tens of meters to more than a hundred meters in order to capture stronger and more stable winds. Electrical equipment includes transformers, switchgear, control equipment and cables, etc., which are used to convert the electrical energy generated by the generator into electrical energy suitable for use in the power grid and transmit it to the power grid. The foundation provides a stable support structure for the tower and turbine.

[0003] Wind power generation is a new type of energy. In recent years, the size of wind turbines has become larger and larger, and the required tower height and diameter have also become larger and larger. At present, in low wind speed areas, towers are mainly divided into segmented pure steel towers, steel-concrete composite towers, and truss towers. Among them, the columns of truss towers are currently divided into pure steel columns and hollow sandwich concrete columns. Pure steel columns are simple to make and easy to hoist, but the columns use a large amount of steel, the production cost is high, and the economy is average. Hollow sandwich concrete columns can reduce the amount of steel used in the columns and reduce the production cost by bearing pressure through concrete, but the bonding quality between concrete and steel pipes is difficult to control, and the concrete is prone to cracking under tension, posing a safety hazard.

[0004] Based on this, we need to develop a hollow sandwich concrete segmental prestressed column, which adopts a combination of external prestressing and internal prestressing. The external prestressing ensures the overall force stability of the column, while the internal prestressing ensures that the concrete will not crack, thereby improving the safety of the tower, making the concrete and steel pipe better bonded, and increasing the upper limit of the bearing strength. Summary of the invention

[0005] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the present invention mainly provides a hollow sandwich concrete segmental prestressed column to solve the technical problems raised in the above background technology that the bonding quality between concrete and steel pipes in the current hollow sandwich concrete columns is difficult to control, the concrete is prone to cracking under tension, and there are safety hazards.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: A hollow sandwich concrete segmental prestressed column, comprising a multi-section column of a hollow structure, the column comprising an outer steel pipe and two inner steel pipes, the outer steel pipe and the inner steel pipe share a central axis, and the inner steel pipe is located at both ends of the outer steel pipe, an intermediate corrugated steel pipe is arranged between the two inner steel pipes, a spiral steel plate is connected to the outer surface of the intermediate corrugated steel pipe, the outer edge of the spiral steel plate is in close contact with the inner wall of the outer steel pipe, and the space formed by the outer steel pipe, the spiral steel plate and the intermediate corrugated steel pipe is filled with a first precast concrete structure; The upper and lower ends of the concrete structure one are provided with annular partitions, the upper annular partition is provided with a plurality of reserved corrugated pipes at equal intervals along the circumferential direction, the lower annular partition is provided with a plurality of ribbed steel bars at equal intervals along the circumferential direction, and the ribbed steel bars and the reserved corrugated pipes in two adjacent sections of the column are plugged into each other, and a second pre-cast concrete structure two is provided between the annular partition and the outer steel pipe.

[0007] Preferably, a plurality of segmented prestressed steel strands are arranged at equal intervals in the concrete structure, and each segmented prestressed steel strand passes through a corresponding circular hole in the spiral steel plate.

[0008] Preferably, both ends of each of the segmented prestressed steel strands pass through the corresponding annular partitions respectively, and a second anchor is provided between the upper end of the segmented prestressed steel strand and the annular partition located above, and a first anchor is provided between the lower end of the segmented prestressed steel strand and the annular partition located below.

[0009] Preferably, each of the annular partitions is provided with a plurality of reinforcing ribs at equal intervals along the circumferential direction, and the reinforcing ribs separate the segmental prestressed steel strands and the ribbed steel bars at equal intervals.

[0010] Preferably, a through-length prestressed channel is provided at the central axis position of each of the columns, and the through-length prestressed channel is located inside the middle corrugated steel pipe.

[0011] Preferably, flanges are provided at both ends of each of the outer steel pipes.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes the combination of external prestressing and internal prestressing by arranging an outer steel pipe, an inner steel pipe, segmental prestressed steel strands, reinforced ribs, annular partitions, a full-length prestressed channel, an intermediate corrugated steel pipe, a concrete structure body 1 and a concrete structure body 2. The external prestressing ensures the overall force stability of the column, and the internal prestressing ensures that the concrete will not crack, thereby improving the safety of the tower and reducing the probability of potential safety hazards. The spiral steel plate is used to connect multiple segmental prestressed steel strands, and the spiral steel plate and the inner part of the outer steel pipe are connected. The wall is close to each other, so that multiple segmented prestressed steel strands, outer steel pipes and spiral steel plates form a whole, which better controls the bonding quality between concrete and steel pipes and ensures better bonding and force transmission between concrete and steel pipes. The spiral steel plates, segmented prestressed steel strands and intermediate corrugated steel pipes effectively disperse the forces on the concrete, ensuring that the tensioning of the existing tower prestressed steel strand bundles is without interference, thereby increasing the upper limit of the longitudinal bearing strength of concrete, further reducing the probability of concrete cracking, and saving steel usage, reducing costs, and having a high market prospect. (2) The present invention realizes that the concrete structure II stabilizes the anchors at both ends of the segmental prestressed steel strands by means of the ribbed steel bars, flange, reserved corrugated pipe, first anchor, second anchor and concrete structure II, thereby further improving the overall stability of the column. At the same time, the concrete structure II also stabilizes the reserved corrugated pipe and ribbed steel bars, making the column structure integrated and better able to withstand external forces. On the basis of splicing the reserved corrugated pipe and ribbed steel bars between adjacent columns, epoxy adhesive is filled, which effectively improves the tensile strength of the concrete inside the column and the overall stress stability of the column, ensures reliable connectivity between adjacent columns, and reduces the problem of concrete cracking at the connection.

[0013] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top view schematic diagram of a column of the present invention; Figure 2 It is a schematic diagram of the main view of the column of the present invention; Figure 3 It is a schematic diagram of the AA section of the column of the present invention; Figure 4 It is a schematic diagram of the cross section of the column BB of the present invention; Figure 5 It is a schematic diagram of the cross section of the column CC of the present invention; Figure 6 It is a schematic cross-sectional view of a column DD of the present invention; Figure 7 The axonometric diagram of the spiral steel plate of the present invention is Figure 8It is a schematic cross-sectional view of the splicing of the ribbed steel bar and the reserved corrugated pipe of the present invention.

[0015] In the figure: 1. outer steel pipe; 2. inner steel pipe; 3. segmental prestressed steel strand; 4. ribbed steel bars; 5. reinforced ribs; 6. annular partition; 7. full-length prestressed channel; 8. middle corrugated steel pipe; 9. flange; 10. reserved corrugated pipe; 11. first anchor; 12. second anchor; 13. concrete structure one; 14. concrete structure two; 15. spiral steel plate. DETAILED DESCRIPTION

[0016] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0017] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] Example 1, please refer to the attached Figure 1-8As shown, a hollow sandwich concrete segmental prestressed column includes a multi-section column of a hollow structure, wherein the column includes an outer steel pipe 1 and two inner steel pipes 2, the outer steel pipe 1 and the inner steel pipe 2 share a central axis, the outer steel pipe 1 has a diameter of φ1000mm~1400mm, the material can be Q355, Q420, the thickness is 18mm~25mm, the inner steel pipe 2 has a diameter of φ500mm, the material can be Q355, Q420, the thickness is 5mm~12mm, and the inner steel pipe 2 is located at both ends of the outer steel pipe 1, an intermediate corrugated steel pipe 8 is arranged between the two inner steel pipes 2, the outer outer surface of the intermediate corrugated steel pipe 8 is connected with a spiral steel plate 15, the outer edge of the spiral steel plate 15 is in close contact with the inner wall of the outer steel pipe 1, and the outer steel The space formed by the tube 1, the spiral steel plate 15 and the middle corrugated steel tube 8 is filled with a first precast concrete structure 13; the upper and lower ends of the concrete structure 13 are provided with annular partitions 6, the upper annular partition 6 is provided with a plurality of reserved corrugated tubes 10 at equal intervals along the circumferential direction, the lower annular partition 6 is provided with a plurality of ribbed steel bars 4 at equal intervals along the circumferential direction, and the ribbed steel bars 4 and the reserved corrugated tubes 10 in two adjacent sections of the column are plugged into each other. During on-site installation, it is necessary to first fill the reserved corrugated tubes 10 with epoxy adhesive to fill the gaps, and then insert the ribbed steel bars 4 for docking, and a second precast concrete structure 14 is provided between the annular partition 6 and the outer steel tube 1.

[0020] Through the above structure, a combination of external prestressing and internal prestressing is achieved. The external prestressing ensures the overall force stability of the column, and the internal prestressing ensures that the concrete will not crack, thereby improving the safety of the tower and better controlling the bonding quality between the concrete and the steel pipe, thereby ensuring a reliable bond between the concrete and the inner steel pipe 2 and the outer steel pipe 1, reducing the probability of safety hazards, and ensuring reliable connectivity between the columns, improving the tensile effect of the concrete inside the column and the overall force stability of the column.

[0021] The interior of the column needs to be pre-cast with concrete twice, and the concrete strength can be C60 or C80. The first pre-cast concrete is cast after the first anchor 11, the second anchor 12, the segmental prestressed steel strand 3, the ribbed steel bar 4 and the spiral steel plate 15 are pre-placed at the fixed end; The second pre-cast concrete is poured and sealed after the first anchor 11 and the second anchor 12 are installed and tensioned at the tensioning end, and the reserved corrugated pipe 10 is pre-set. An inner steel pipe 2 is used within 800mm at both ends of the column, and the middle corrugated steel pipe 8 is connected. The material of the middle corrugated steel pipe 8 can be Q355, Q420, with a thickness of 4mm. The use of the middle corrugated steel pipe 8 can ensure better bonding and force transmission between the concrete and the steel pipe, while also saving steel and reducing costs.

[0022] Example 2, please refer to the attached Figure 1 and2 As shown, each of the annular partitions 6 is provided with a plurality of reinforcing ribs 5 at equal intervals along the circumferential direction, and the reinforcing ribs 5 separate the segmental prestressed steel strands 3 and the ribbed steel bars 4 at equal intervals. The reinforcing ribs 5 are used to improve the overall strength of the annular partition 6. At the same time, the uniform distribution of the reinforcing ribs 5 can better improve the uniformity of force and avoid uneven stress and cracking of concrete. A full-length prestressed channel 7 is provided at the central axis position of each of the columns. The full-length prestressed channel 7 is located inside the middle corrugated steel pipe 8. The full-length prestressed channel 7 that needs to be tensioned on site is reserved inside to ensure that the tensioning of the existing tower segment prestressed steel strands 3 is free of interference. Flanges 9 are provided at both ends of each of the outer steel pipes 1. The flanges 9 are used to achieve external connection between the columns, so that the external prestressing force ensures the overall stability of the column.

[0023] Example 3, please refer to the attached Figure 5 , 6 As shown in 7, a plurality of segmented prestressed steel strands 3 are arranged at equal intervals around the concrete structure 13, and each segmented prestressed steel strand 3 passes through the corresponding circular hole on the spiral steel plate 15. The integration of the structure is achieved through the connection between the segmented prestressed steel strand 3 and the spiral steel plate 15, and the external force is better borne. The two ends of each segmented prestressed steel strand 3 pass through the corresponding annular partition 6 respectively, and a second anchor 12 is arranged between the upper end of the segmented prestressed steel strand 3 and the annular partition 6 located above, and a first anchor 11 is arranged between the lower end of the segmented prestressed steel strand 3 and the annular partition 6 located below. The positioning of the two ends of the segmented prestressed steel strand 3 is achieved through the mutual cooperation between the first anchor 11 and the second anchor 12.

[0024] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A hollow sandwich concrete segmental prestressed column, comprising a multi-section column of a hollow structure, characterized in that The column comprises an outer steel pipe (1) and two inner steel pipes (2), the outer steel pipe (1) and the inner steel pipe (2) share a central axis, and the inner steel pipe (2) is located at both ends of the outer steel pipe (1), an intermediate corrugated steel pipe (8) is arranged between the two inner steel pipes (2), a spiral steel plate (15) is connected to the outer surface of the intermediate corrugated steel pipe (8), the outer edge of the spiral steel plate (15) is in close contact with the inner wall of the outer steel pipe (1), and the space formed by the outer steel pipe (1), the spiral steel plate (15) and the intermediate corrugated steel pipe (8) is filled with a first precast concrete structure (13); The upper and lower ends of the concrete structure 1 (13) are both provided with annular baffles (6), the upper annular baffle (6) is provided with a plurality of reserved corrugated pipes (10) at equal intervals along the circumferential direction, the lower annular baffle (6) is provided with a plurality of ribbed steel bars (4) at equal intervals along the circumferential direction, and the ribbed steel bars (4) and the reserved corrugated pipes (10) in two adjacent sections of the column are plugged into each other, and a second precast concrete structure 2 (14) is provided between the annular baffle (6) and the outer steel pipe (1).

2. A hollow sandwich concrete segment prestressed column according to claim 1, characterized in that: A plurality of segmented prestressed steel strands (3) are arranged at equal intervals in the concrete structure (13), and each segmented prestressed steel strand (3) passes through a corresponding circular hole on the spiral steel plate (15).

3. The hollow sandwich concrete segment prestressed column according to claim 2, characterized in that: Both ends of each of the segmented prestressed steel strands (3) pass through the corresponding annular baffles (6), and a second anchor (12) is provided between the upper end of the segmented prestressed steel strand (3) and the annular baffle (6) located above, and a first anchor (11) is provided between the lower end of the segmented prestressed steel strand (3) and the annular baffle (6) located below.

4. The hollow sandwich concrete segment prestressed column according to claim 3, characterized in that: Each of the annular partitions (6) is provided with a plurality of reinforcing ribs (5) at equal intervals along the circumferential direction, and the reinforcing ribs (5) separate the segmental prestressed steel strands (3) and the ribbed steel bars (4) at equal intervals.

5. The hollow sandwich concrete segment prestressed column according to claim 1, characterized in that: A full-length prestressed hole (7) is provided at the center axis position of each column, and the full-length prestressed hole (7) is located inside the middle corrugated steel pipe (8).

6. The hollow sandwich concrete segment prestressed column according to claim 1, characterized in that: Both ends of each outer steel pipe (1) are provided with flanges (9).

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