Upper tension prestress concrete filled steel tubular column-foundation structure and construction method

Abstract

The invention relates to an upper part tension prestress concrete filled steel tubular column-foundation structure and a construction method. The structure comprises a steel strand, a concrete filled steel tubular column, a first flange, a steel strand anchor plate, a second flange, a flange high-strength bolt, a seven-hole anchorage device, a steel column, a hand hole cover plate, a third flange, a foundation anchor bolt and a foundation; a steel strand is anchored on a steel strand anchor plate through a seven-hole anchorage device, the steel strand anchor plate is connected with a first flange and a second flange through flange high-strength bolts, the second flange is connected with a steel column, the steel column is connected with a foundation through a third flange and a foundation anchor bolt, and the steel strand is tensioned and anchored above the ground. The hand hole cover plate is fixed on the outer side of the hand hole of the steel column; a center hole is formed in the steel strand anchor plate and used for allowing the steel strand and the seven-hole anchorage device to penetrate through, and a limiting groove is formed in the bottom face of the steel strand anchor plate and used for clamping and fixing the seven-hole anchorage device. Compared with the prior art, the method has the advantages of being small in steel consumption, excellent in fatigue resistance, convenient to construct, easy to maintain, high in adaptability and the like.

Description

Technical Field

[0001] This invention relates to the field of tall steel structure technology truss wind turbine towers, and in particular to a prestressed steel tube concrete column-foundation structure and construction method. Background Technology

[0002] As the hub height of onshore wind turbines continues to increase, the steel consumption of traditional single-tube steel tower structures has risen sharply to meet load-bearing requirements, while structural stiffness has significantly decreased, increasing the possibility of resonance between the tower and the turbine. Safety performance becomes highly dependent on the stable operation of the control system. Truss steel tower structures can effectively solve this problem, suppressing the non-linear increase in steel consumption with height, significantly improving stiffness, and preventing resonance. Further optimization utilizes prestressed steel-concrete composite truss towers, where the tower columns use a composite section of steel and concrete, partially replacing steel with concrete to reduce costs. However, concrete has relatively weak tensile strength, requiring prestressing with numerous steel strands to ensure the section is under compression under most operating conditions and to meet fatigue resistance requirements. This results in a large number of steel strands within the tower column, often reaching dozens. Existing technologies typically perform tensioning and anchoring in the basement, but placing the basement within the foundation significantly increases the workload and cost, and in areas with high groundwater levels, water ingress is difficult to avoid.

[0003] CN201921227712.1 discloses a fixed cable system for a hybrid structure wind tower, including steel strand cables and a connecting device. The steel strand cables are finished cables with a clamp-type anchor at the tension end and a threaded extrusion sleeve anchor at the fixed end. The connecting device includes a connecting rod, a flange, and a steel bar. In the installed state, one end of the steel bar inside the steel tower column is connected to an anchor bolt pre-embedded at the bottom of the concrete foundation, and the other end passes through the steel bar anchor hole in the flange and is fixed by nut I. The fixed end of the steel strand cable is connected to one end of the connecting rod of the connecting device, and the other end of the connecting rod is anchored by nut II on the bottom surface of the flange through an anchor groove on the flange. The tension end of the steel strand cable engages with the steel strand through a clamp and is anchored to the top of the steel column. However, its core connecting device (flange, steel bar, connecting rod) and the fixed end of the cable are all located at the bottom of the underground concrete foundation. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art by providing a prestressed steel tube concrete column-foundation structure and construction method with lower steel consumption, better fatigue resistance, convenient construction, simple maintenance, and strong adaptability.

[0005] The objective of this invention can be achieved through the following technical solutions: This invention provides a prestressed steel tube concrete column-foundation structure with upper tension, including steel strands, steel tube concrete column, first flange, steel strand anchor plate, second flange, flange high-strength bolts, seven-hole anchor, steel column, manhole cover plate, third flange, foundation anchor bolts, and foundation; The steel strand is anchored to the steel strand anchor plate by a seven-hole anchor. The steel strand anchor plate is connected to the first flange and the second flange by high-strength flange bolts. The second flange is connected to the steel column. The steel column is connected to the foundation by a third flange and foundation anchor bolts, so that the steel strand can be tensioned and anchored above the ground. The manhole cover plate is fixed to the outside of the manhole of the steel column. The steel strand anchor plate has a central hole for the steel strand and the seven-hole anchor to pass through, and the bottom surface of the steel strand anchor plate is provided with a limiting groove for securing the seven-hole anchor.

[0006] Furthermore, the first flange, the second flange, and the third flange are all T-type or L-type forged flanges with necks.

[0007] Furthermore, the first flange is connected to the steel-concrete composite column via double-sided full-penetration butt welds; the second and third flanges are connected to the steel column via double-sided full-penetration butt welds.

[0008] Furthermore, the outer ring of the steel strand anchor plate is provided with a ring of bolt holes for connecting high-strength bolts to the flange.

[0009] Furthermore, the steel column has multiple hand holes, and stiffening ribs are provided on both sides of the hand holes.

[0010] Furthermore, the clamping distance of the high-strength flange bolts is 8 to 10 times the bolt diameter. If the clamping distance is insufficient, bolt sleeves are installed to increase the clamping distance.

[0011] Furthermore, the handhole cover plate is fixed to the outside of the handhole of the steel column by handhole cover plate bolts.

[0012] This invention also provides a construction method for a prestressed steel tube concrete column-foundation structure, comprising the following steps: S1: The welding of the first flange to the steel-concrete composite column, the second flange to the steel column, and the third flange to the steel column is completed in the factory. S2: Transport the welded components to the site; S3: Install the third flange, steel column and second flange on the foundation and foundation anchor bolts, and do not tension the foundation anchor bolts for the time being; S4: Install steel strand anchor plates, the first flange and the steel pipe concrete column, and install the flange high-strength bolts. The flange high-strength bolts are not tensioned for the time being. S5: Pass the steel strand through the seven-hole anchor and fix it with the clamp-type anchor. Pass the assembly from the center of the steel pipe concrete column to the bottom of the steel strand anchor plate, so that the seven-hole anchor is inserted into the limiting groove of the steel strand anchor plate. S6: Tensioning steel strands at the top of the steel-concrete composite column; S7: Install the manhole cover and manhole cover bolts; S8: Tensioning flange high-strength bolts and foundation anchors to design preload.

[0013] Furthermore, in S6, a steel strand tensioner is used to complete the tensioning at the top of the steel-concrete composite column.

[0014] Furthermore, in S5, operations are performed through handholes in the steel columns.

[0015] Compared with the prior art, the present invention has the following advantages: (1) Eliminating the basement reduces costs and broadens applicability. The anchoring and tensioning of the steel strands are all moved above ground level, thus eliminating the need for the basement structure traditionally located within the foundation. This makes the foundation force transmission path more direct and the structure more rational, significantly reducing foundation work (such as formwork and pouring) and overall cost. It also avoids the problem of basements being prone to water ingress in areas with high groundwater levels, broadening the applicable scenarios for prestressed steel-concrete composite truss towers.

[0016] (2) Optimized structure for easy construction and maintenance. The construction process mainly uses bolted connections (such as flanges, anchor bolts, and cover plate bolts), which simplifies on-site operations and improves construction efficiency. The steel strands are anchored in a distributed manner (through seven-hole anchors), which reduces the workload of each operation and facilitates on-site construction. The fixed end of the steel strand is located at the bottom and can be operated and positioned through the handhole on the steel column. The structure is simple and also facilitates future inspection and maintenance of the fixed end.

[0017] (3) Performance and economy are both taken into account. By optimizing the ideal clamping distance of the high-strength flange bolts (8 to 10 times the bolt diameter), it is suitable for applying preload using the direct tensioning method, thus achieving stable and controllable preload and taking economy into account. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram and AA section cross-section of the upper tensioned prestressed steel tube concrete column-foundation structure. Figure 2 This is a top view of the prestressed steel tube concrete column-foundation structure. Figure 3 This is a cross-sectional view of the BB section of the upper tensioned prestressed steel tube concrete column-foundation structure.

[0019] Reference numerals: 1. Steel strand, 2. Steel-concrete composite column, 3. First flange, 4. Steel strand anchor plate, 5. Second flange, 6. High-strength flange bolt, 7. Seven-hole anchor, 8. Steel column, 9. Manhole cover plate, 10. Manhole cover plate bolt, 11. Third flange, 12. Foundation anchor bolt, 13. Foundation. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0021] Example 1 This embodiment provides a prestressed steel-concrete composite column-foundation structure with upper tension, such as... Figure 1-3 As shown, it includes steel strand 1, steel pipe concrete column 2, first flange 3, steel strand anchor plate 4, second flange 5, flange high-strength bolt 6, seven-hole anchor 7, steel column 8, manhole cover plate 9, third flange 11, foundation anchor bolt 12, and foundation 13. The steel strand 1 is anchored to the steel strand anchor plate 4 by a seven-hole anchor 7. The steel strand anchor plate 4 is connected to the first flange 3 and the second flange 5 by high-strength flange bolts 6. The second flange 5 is connected to the steel column 8. The steel column 8 is connected to the foundation 13 by a third flange 11 and foundation anchor bolts 12, so that the steel strand 1 can be tensioned and anchored above the ground. The manhole cover plate 9 is fixed to the outside of the manhole of the steel column 8. The steel strand anchor plate 4 has a central hole for the steel strand 1 and the seven-hole anchor 7 to pass through, and the bottom surface of the steel strand anchor plate 4 is provided with a limiting groove for securing the seven-hole anchor 7.

[0022] Example 2 This embodiment provides a prestressed steel-concrete composite column-foundation structure with upper tension, such as... Figure 1-3 As shown, it includes steel strand 1, steel pipe concrete column 2, first flange 3, steel strand anchor plate 4, second flange 5, flange high-strength bolt 6, seven-hole anchor 7, steel column 8, manhole cover plate 9, third flange 11, foundation anchor bolt 12, and foundation 13. The steel strand 1 is anchored to the steel strand anchor plate 4 by a seven-hole anchor 7. The steel strand anchor plate 4 is connected to the first flange 3 and the second flange 5 by high-strength flange bolts 6. The second flange 5 is connected to the steel column 8. The steel column 8 is connected to the foundation 13 by a third flange 11 and foundation anchor bolts 12, so that the steel strand 1 can be tensioned and anchored above the ground. The manhole cover plate 9 is fixed to the outside of the manhole of the steel column 8. The steel strand anchor plate 4 has a central hole for the steel strand 1 and the seven-hole anchor 7 to pass through, and the bottom surface of the steel strand anchor plate 4 is provided with a limiting groove for securing the seven-hole anchor 7.

[0023] In a specific embodiment, the first flange 3, the second flange 5, and the third flange 11 are all T-type or L-type necked forged flanges.

[0024] In a specific embodiment, the first flange 3 is connected to the steel-concrete composite column 2 by a double-sided full penetration butt weld; the second flange 5 and the third flange 11 are connected to the steel column 8 by double-sided full penetration butt welds.

[0025] In a specific embodiment, the outer ring of the steel strand anchor plate 4 is provided with a ring of bolt holes for connecting the high-strength flange bolts 6.

[0026] In a specific embodiment, the steel column 8 has multiple hand holes, and stiffening ribs are provided on both sides of the hand holes.

[0027] In a specific embodiment, the clamping distance of the high-strength flange bolt 6 is 8 to 10 times the bolt diameter. If the clamping distance is insufficient, a bolt sleeve is set to increase the clamping distance.

[0028] In a specific embodiment, the handhole cover plate 9 is fixed to the outside of the handhole of the steel column 8 by the handhole cover plate bolt 10.

[0029] Example 3 This embodiment provides a construction method for a prestressed steel tube concrete column-foundation structure with upper tension, including the following steps: S1: Welding of the first flange 3 to the steel pipe concrete column 2, the second flange 5 to the steel column 8, and the third flange 11 to the steel column 8 is completed in the factory. S2: Transport the welded components to the site; S3: Install the third flange 11, steel column 8 and second flange 5 on the foundation 13 and foundation anchor bolt 12. The foundation anchor bolt 12 will not be tensioned for the time being. S4: Install steel strand anchor plate 4, first flange 3 and steel pipe concrete column 2, install flange high-strength bolts 6, flange high-strength bolts 6 are not tensioned for the time being; S5: Pass the steel strand 1 through the seven-hole anchor 7 and fix it with the clip-type anchor. Pass the assembly from the center of the steel pipe concrete column 2 to the bottom of the steel strand anchor plate 4, so that the seven-hole anchor 7 is inserted into the limiting groove of the steel strand anchor plate 4. S6: Tension steel strand 1 at the top of steel-concrete composite column 2; S7: Install the handhole cover plate 9 and the handhole cover plate bolts 10; S8: Tension flange high-strength bolts 6 and foundation anchors 12 to design preload.

[0030] In a specific implementation, in S6, a steel strand tensioner is used to complete the tensioning on the upper part of the steel-concrete composite column 2.

[0031] In a specific implementation, operation is performed through the handhole of the steel column 8 in step S5.

[0032] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0033] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A prestressed steel-concrete composite column-foundation structure with upper tension, characterized in that, Includes steel strand (1), steel pipe concrete column (2), first flange (3), steel strand anchor plate (4), second flange (5), flange high-strength bolt (6), seven-hole anchor (7), steel column (8), handhole cover plate (9), foundation (13); The steel strand (1) is anchored to the steel strand anchor plate (4) by a seven-hole anchor (7). The steel strand anchor plate (4) is connected to the first flange (3) and the second flange (5) respectively by high-strength flange bolts (6). The second flange (5) is connected to the steel column (8). The steel column (8) is connected to the foundation (13), so that the steel strand (1) can be tensioned and anchored above the ground. The handhole cover plate (9) is fixed on the outside of the handhole of the steel column (8). The steel strand anchor plate (4) has a central hole for passing through the steel strand (1) and the seven-hole anchor (7), and the bottom surface of the steel strand anchor plate (4) is provided with a limiting groove for securing the seven-hole anchor (7).

2. The upper tensioned prestressed steel tube concrete column-foundation structure according to claim 1, characterized in that, The first flange (3), the second flange (5) and the third flange (11) are all T-type or L-type necked forged flanges.

3. The upper tensioned prestressed steel tube concrete column-foundation structure according to claim 1, characterized in that, The first flange (3) is connected to the steel-concrete composite column (2) by a double-sided full penetration butt weld; the second flange (5) and the third flange (11) are connected to the steel column (8) by a double-sided full penetration butt weld.

4. The upper tensioned prestressed steel tube concrete column-foundation structure according to claim 1, characterized in that, The outer ring of the steel strand anchor plate (4) is provided with a ring of bolt holes for connecting the high-strength bolts (6) of the flange.

5. The upper tensioned prestressed steel tube concrete column-foundation structure according to claim 1, characterized in that, The steel column (8) has multiple hand holes, and stiffening ribs are provided on both sides of the hand holes.

6. The upper tensioned prestressed steel tube concrete column-foundation structure according to claim 1, characterized in that, The clamping distance of the high-strength flange bolt (6) is 8 to 10 times the bolt diameter. If the clamping distance is insufficient, a bolt sleeve is set to increase the clamping distance.

7. The upper tensioned prestressed steel tube concrete column-foundation structure according to claim 1, characterized in that, The handhole cover plate (9) is fixed to the outside of the handhole of the steel column (8) by handhole cover plate bolts (10).

8. A construction method for a prestressed steel-concrete composite column-foundation structure as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Weld the first flange (3) to the steel pipe concrete column (2), the second flange (5) to the steel column (8), and the third flange (11) to the steel column (8) in the factory; S2: Transport the welded components to the site; S3: Install the third flange (11), steel column (8), and second flange (5) on the foundation (13) and foundation anchor bolt (12). The foundation anchor bolt (12) is not tensioned for the time being. S4: Install steel strand anchor plate (4), first flange (3) and steel pipe concrete column (2), install flange high-strength bolts (6), flange high-strength bolts (6) are not tensioned for the time being; S5: Pass the steel strand (1) through the seven-hole anchor (7) and fix it with the clip-type anchor. Pass the assembly from the center of the steel pipe concrete column (2) to the bottom of the steel strand anchor plate (4) so ​​that the seven-hole anchor (7) is inserted into the limiting groove of the steel strand anchor plate (4). S6: Tension steel strands (1) on the upper part of the steel-concrete composite column (2); S7: Install the handhole cover plate (9) and the handhole cover plate bolts (10); S8: Tensioning flange high-strength bolts (6) and foundation anchors (12) to the design preload.

9. A construction method for a prestressed steel tube concrete column-foundation structure according to claim 1, characterized in that, In S6, a steel strand tensioner is used to complete the tensioning on the upper part of the steel-concrete composite column (2).

10. A construction method for a prestressed steel-concrete composite column-foundation structure according to claim 1, characterized in that, In S5, the operation is carried out through the handhole of the steel column (8).

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