Tower flange, assembled hollow sandwich steel-concrete composite tower and wind power structure

Abstract

This invention provides a tower connecting flange, an assembled hollow sandwich steel-concrete composite tower, and a wind power structure. The connecting flange includes an upper groove, a lower groove, a connecting assembly, an upper fixing assembly, and a lower fixing assembly. Both the upper and lower grooves are annular groove structures, with the upper groove opening facing downwards and the lower groove opening facing upwards. They interlock to form a cylinder with a hollow cavity. The connecting assembly connects the interlocked upper and lower grooves together using a finger-like friction connection. The upper and lower fixing assemblies are respectively fixed to the upper and lower grooves. The tower includes multiple tower segment modules and at least one annular connecting module. The wind power structure may include the assembled hollow sandwich steel-concrete composite tower described above. This invention solves the problems of reduced elongation and insufficient preload of high-strength bolts due to pressure on the support surface in traditional L-type flanges; this invention enables the flange to withstand greater external loads; and this invention improves the overall performance of the composite structure.

Description

Technical Field

[0001] This invention relates to the field of prefabricated structures, specifically to a tower connecting flange, a prefabricated hollow sandwich steel-concrete composite tower, and a wind power structure. Background Technology

[0002] Currently, wind turbine towers mostly use L-type flange connections. Stress typically concentrates in localized areas around the bolt holes and flange edges. These stress concentration areas are high-risk zones for fatigue cracking and early failure, especially under dynamic loads or high-frequency vibrations, where fatigue life is significantly reduced. Installing L-type flange connections is usually a complex process requiring highly specialized workers and precision equipment. During installation, the flange surface must be completely flat and clean to ensure a good seal, and the bolt holes must be precisely aligned, increasing equipment and labor costs. Furthermore, with increased loads, L-type flange connections often require increased flange thickness to improve their load-bearing capacity. Increasing flange thickness means more material is needed, directly increasing costs; it also increases the weight of the entire connection structure, increasing design and installation difficulty; and it requires greater bolt preload to ensure sufficient friction to withstand the fatigue loads borne by the wind turbine structure (e.g., offshore wind turbines), thus placing very high demands on the bolts. Summary of the Invention

[0003] The purpose of this invention is to address at least one of the aforementioned deficiencies in the prior art.

[0004] To achieve the above objectives, the present invention provides a tower connection flange.

[0005] The connecting flange includes an upper groove, a lower groove, a connecting assembly, an upper fixing assembly, and a lower fixing assembly. Both the upper and lower grooves are annular groove structures, with the groove opening of the upper groove facing downwards and the groove opening of the lower groove facing upwards. They interlock to form a cylindrical body with a hollow cavity. The connecting assembly connects the interlocked upper and lower grooves together using a finger-like friction connection. The upper fixing assembly is fixed to the upward-facing side of the upper groove, and the lower fixing assembly is fixed to the downward-facing side of the lower groove.

[0006] Alternatively, the longitudinal section of the cylinder can be a regular octagon.

[0007] Alternatively, the upper groove member has a first longitudinal plate, a first inclined plate, a first transverse plate, a second inclined plate, and a second longitudinal plate connected in sequence, wherein the first longitudinal plate and the second longitudinal plate are parallel and both are perpendicular to the first transverse plate.

[0008] Alternatively, the lower groove includes a third longitudinal plate, a third inclined plate, a second transverse plate, a fourth inclined plate, and a fourth longitudinal plate connected in sequence, wherein the third longitudinal plate and the fourth longitudinal plate are parallel and both are perpendicular to the second transverse plate;

[0009] Alternatively, the first longitudinal plate and the third longitudinal plate are bonded together and connected by the finger-shaped friction connection, and the second longitudinal plate and the fourth longitudinal plate are bonded together and connected by the finger-shaped friction connection.

[0010] Optionally, one of the first longitudinal plate and the third longitudinal plate is a first finger plate and the other is a first porous plate; wherein the first finger plate has multiple slits and the first porous plate has multiple sets of longitudinal holes, the number of sets of longitudinal holes being the same as the number of slits and corresponding one-to-one, and each set of longitudinal holes facing the corresponding slit.

[0011] Optionally, one of the second longitudinal plate and the fourth longitudinal plate is a second finger plate and the other is a second porous plate; wherein the second finger plate has multiple slits and the second porous plate has multiple longitudinal hole groups, each longitudinal hole group including multiple holes, the number of which is the same as the number of slits and corresponds one-to-one, and each longitudinal hole group is directly opposite the corresponding slit.

[0012] Optionally, the connecting assembly includes a first friction plate, a second friction plate, a first connector, and a second connector. The first friction plate is a perforated plate, and the number of longitudinal holes on the first friction plate is the same as and corresponds one-to-one with the number of longitudinal holes on the first perforated plate. The first friction plate is attached to the surface of the first finger plate or the first perforated plate. The first connector connects the first longitudinal plate, the third longitudinal plate, and the first friction plate together. The second friction plate is a perforated plate, and the number of longitudinal holes on the second friction plate is the same as and corresponds one-to-one with the number of longitudinal holes on the second perforated plate. The second friction plate is attached to the surface of the second finger plate or the second perforated plate. The second connector connects the second longitudinal plate, the fourth longitudinal plate, and the second friction plate together.

[0013] Furthermore, the first friction plate is attached to the surface of the first finger plate that is away from the first perforated plate.

[0014] Furthermore, the second friction plate is attached to the surface of the second finger plate opposite to the second perforated plate.

[0015] Furthermore, the number of the first connectors is the same as the number of holes on the first perforated plate and they correspond one-to-one.

[0016] Furthermore, the second connector has the same number of holes as the second perforated plate and they correspond one-to-one.

[0017] Alternatively, the lower groove has at least one grouting hole, the upper groove has at least one grout outlet hole, and the cylinder is filled with concrete.

[0018] Alternatively, the upper fixing component may include at least one first fixing plate, and the lower fixing component may include at least one second fixing plate, wherein both the first fixing plate and the second fixing plate are perforated plates.

[0019] Another type of assembled hollow sandwich steel-concrete composite tower of the present invention.

[0020] The tower may include multiple tower segment modules arranged from top to bottom, and at least one annular connecting module; wherein, each tower segment module includes multiple cylindrical plates arranged around the center line of the tower, and the multiple cylindrical plates are connected end to end in sequence; the annular connecting module is located between two adjacent tower segments, and the annular connecting module includes multiple tower connecting flanges as described above, and the multiple connecting flanges are connected end to end in sequence to form an annular cylinder.

[0021] Alternatively, the number of ring connection modules may be one less than the number of tower segment modules.

[0022] Alternatively, the tower may also include several conventional connecting flanges for connecting some adjacent tower section modules.

[0023] Optionally, the tower may further include multiple annular connecting assemblies disposed between two adjacent sections. Each annular connecting assembly includes a base, a connecting plate, and at least one elastic element. The base is mounted on the side of the section and has a groove with its opening facing away from the side. One end of the connecting plate is hinged to the groove, and under external force, the elastic element can be positioned within the groove. One end of the elastic element is connected to the groove, and the other end is connected to the body of the connecting plate. The other side of the section has a channel allowing the annular connecting assemblies on adjacent sections to penetrate deeply.

[0024] Alternatively, the tower may further include multiple prestressed anchoring assemblies and multiple prestressed members. Each prestressed anchoring assembly includes a first anchor and a second anchor, wherein the first and second anchors are located on the inner wall of the tower segment, and the two ends of the prestressed member are respectively connected to an anchor on an adjacent tower segment.

[0025] Alternatively, the cylindrical plate includes an outer plate and an inner plate disposed opposite to each other, and the cylindrical plate is interconnected with the upper fixing assembly and / or lower fixing assembly of the connecting flange by a PBL shear key with reinforcing bars.

[0026] Alternatively, holes may be provided at both the upper and lower ends of the cylindrical plate, and the cylindrical plate may be connected to the fixing assembly of the connecting flange by high-strength bolts.

[0027] In another aspect, the present invention provides a wind power structure.

[0028] The wind power structure may include the prefabricated hollow sandwich steel-concrete composite tower as described above.

[0029] Alternatively, the wind power structure may include a wind power foundation, with the bottom of the tower connected to the wind power foundation via a converter.

[0030] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0031] (1) The present invention has a simple structure and low preparation cost.

[0032] (2) The present invention will not have the problem of flange surface leveling, and at the same time solves the problem of insufficient preload caused by the reduction of high-strength bolt elongation due to the pressure on the support surface of the traditional L-type flange.

[0033] (3) This invention applies a steel-concrete composite structure to the flange, enabling the flange to withstand greater external loads and improving its stress performance; furthermore, the steel-concrete composite structure has high toughness and energy absorption capacity. The steel-concrete composite structure compensates for the stress at the traditional L-shaped connection and is very suitable for the offshore wind power field.

[0034] (4) The circumferential connection of the present invention adopts a prestressed anchoring component, which enhances the circumferential stiffness and strength between the cylinder segments.

[0035] (5) The present invention adopts a prefabricated hollow sandwich steel-concrete structure and a cast-in-place steel pipe concrete structure to improve the overall performance of the composite structure.

[0036] (6) The present invention can reduce the openings in the inner and outer steel plates, improve the cross-sectional properties of the steel plates, and facilitate the pouring and construction of concrete.

[0037] (7) The present invention has a more reliable connection form, which solves the problem of on-site construction of offshore wind power. Attached Figure Description

[0038] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0039] Figure 1A A schematic diagram of a tower connection flange is shown;

[0040] Figure 1B Another structural schematic diagram of the tower connection flange is shown;

[0041] Figure 2 A structural schematic diagram of the upper groove component is shown;

[0042] Figure 3 A structural schematic diagram of the lower groove component is shown;

[0043] Figure 4A structural schematic diagram of the connector plate is shown;

[0044] Figure 5 A schematic diagram of a portion of the tower is shown;

[0045] Figure 6 A schematic diagram of the connection between the cylindrical plate and the tower cylinder connecting flange A is shown;

[0046] Figure 7A This diagram shows a connection between the upper and lower ends of the cylindrical plate and the flange connectors.

[0047] Figure 7B Another connection diagram is shown, showing the upper and lower ends of the cylindrical plate connected to the flange connectors respectively;

[0048] Figure 8 A schematic diagram of a circumferential connector is shown.

[0049] Figure 9 A schematic diagram of a circumferential connector disposed on one side plate of a cylindrical plate is shown;

[0050] Figure 10 A schematic diagram showing a channel formed on one side plate of a cylindrical plate is shown;

[0051] Figure 11 A schematic diagram of a prestressed anchorage assembly is shown.

[0052] Figure 12 A schematic diagram showing the location of the connecting plate is provided.

[0053] Figure 13 A schematic diagram showing the connection relationship between the connecting plate and the fixing plate is shown.

[0054] Explanation of key figure labels:

[0055] A-Tower connection flange;

[0056] 1-Upper trough, 11-First longitudinal plate, 12-First inclined plate, 13-First transverse plate, 14-Second inclined plate, 15-Second longitudinal plate, 16-Slurry outlet hole;

[0057] 2-Upper groove component, 21-Third longitudinal plate, 22-Third inclined plate, 23-Second transverse plate, 24-Fourth inclined plate, 25-Fourth longitudinal plate, 26-Grouting hole;

[0058] 31-Friction plate, 32-Connector;

[0059] 4-First fixing plate;

[0060] 5-Second fixing plate;

[0061] 6-Cylinder plate, 61-Outer plate, 62-Inner plate, 63-Left side plate, 64-Right side plate, 65-Connecting hole plate;

[0062] 7-Circumferential connector, 71-Base, 72-Connecting plate, 73-Elastic element;

[0063] 81-First anchor, 82-Second anchor, 83-Prestressed component;

[0064] 9-channel. Detailed Implementation

[0065] In the following sections, the tower connection flange, the assembled hollow sandwich steel-concrete composite tower, and the wind power structure of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0066] It should be noted that "up", "down", "front", "back", "left", "right", "inner", and "outer" are used only to facilitate the description and formation of relative orientations or positional relationships, and do not indicate or imply that the part referred to must have that specific orientation or position.

[0067] Exemplary Example 1

[0068] This exemplary embodiment provides a tower connection flange.

[0069] The connecting flange may include an upper grooved component, a lower grooved component, a connecting assembly, an upper fixing assembly, and a lower fixing assembly. Both the upper and lower grooved components are annular groove structures, with the groove opening of the upper grooved component facing downwards and the groove opening of the lower grooved component facing upwards. When interlocked, they form a cylindrical body with a hollow cavity. The connecting assembly connects the interlocked upper and lower grooved components together using a finger-like friction connection. The upper fixing assembly is fixed to the upward-facing side of the upper grooved component, and the lower fixing assembly is fixed to the downward-facing side of the lower grooved component. The upper grooved component and the upper fixing assembly can be considered as an upper flange, and the lower grooved component and the lower fixing assembly can be considered as a lower flange.

[0070] In this embodiment, as Figure 1A and 1B As shown, the cylinder body after the upper groove 1 and lower groove 2 are fastened together can be a straight cylindrical structure, and the longitudinal cross-section of its cavity can be octagonal, such as a regular octagon or a near-regular octagon. The purpose of using an octagonal cross-section in this invention is mainly that only an octagonal cross-section can introduce friction-type finger connections, providing sufficient initial construction stiffness after assembly before concrete is poured; at the same time, the octagonal cross-section is close to a circle, so under the action of wind or water flow, its streamlined characteristics can reduce the generation of eddies and turbulence, thereby reducing the wind resistance on the structure; the corners of the octagon are relatively smooth, which helps to reduce stress concentration, especially at the connection parts of the structure. If other cross-sections are used, it is difficult to achieve the above effects. For example, the sharp corners of a square cross-section may cause stress concentration and increase the risk of cracks.

[0071] In this embodiment, the upper groove includes, for example, Figure 2 The first longitudinal plate 11, the first inclined plate 12, the first transverse plate 13, the second inclined plate 14, and the second longitudinal plate 15 are connected in sequence as shown. The first longitudinal plate 11 and the second longitudinal plate 15 are parallel to each other and are both perpendicular to the first transverse plate 13.

[0072] Lower slotted parts include, for example Figure 3 The third longitudinal plate 21, the third inclined plate 22, the second transverse plate 23, the fourth inclined plate 24, and the fourth longitudinal plate 25 are connected in sequence as shown. The third longitudinal plate 21 and the fourth longitudinal plate 25 are parallel and both are perpendicular to the second transverse plate 23.

[0073] like Figure 2 As shown, both the first longitudinal plate 11 and the second longitudinal plate 15 are finger-shaped plates, and the finger-shaped plates have multiple slits. Figure 3 As shown, both the third longitudinal plate 21 and the fourth longitudinal plate 25 are perforated plates, and both have multiple hole groups. Each hole group includes multiple holes distributed longitudinally. The number of hole groups and gaps are the same and correspond one-to-one. The holes in the hole group are directly opposite the corresponding gaps.

[0074] Of course, the present invention is not limited to this. The first longitudinal plate 11 and the second longitudinal plate 15 can also be perforated plates, and the third longitudinal plate 21 and the fourth longitudinal plate 25 are corresponding to finger plates.

[0075] In traditional L-type flange connections, stress typically concentrates in high-risk areas such as bolt holes and flange edges. Under dynamic loads or high-frequency vibrations, the fatigue life in these areas is significantly reduced. Furthermore, L-type flange connections are cumbersome and costly to install. This invention, however, uses a friction connection where the load direction is perpendicular to the connecting parts (e.g., high-strength rivets), eliminating the need for flange surface leveling. It also addresses the issue of insufficient preload caused by reduced elongation of high-strength bolts due to pressure on the support surface in traditional L-type flanges. Moreover, the finger-shaped friction connection of this invention exhibits a different failure mode than traditional L-type flanges, shifting the failure location to buckling failure of the cylinder wall, which is mitigated by the hollow sandwiched cylinder wall (described later).

[0076] In this embodiment, as Figure 2 As shown, a slurry outlet hole 16 is provided on the first inclined plate 12. The number of slurry outlet holes 16 is not limited to one, and multiple holes can be provided according to the actual situation. The slurry outlet hole 16 can also be provided on the second inclined plate 14.

[0077] like Figure 1A and 1B As shown, a grouting hole 26 is provided on the lower groove 2. The grouting hole 26 can be provided in... Figure 3 On the third inclined plate 22 or the fourth inclined plate 24 shown.

[0078] This invention allows concrete to be poured into the cavity formed by the upper groove 1 and the lower groove 2 through the grouting hole 26. This invention can form a composite structure similar to concrete-filled steel pipe by on-site concrete pouring, significantly improving the rigidity and strength of the flange.

[0079] Under increased loads, traditional L-type flange connections typically require increasing flange thickness to improve their load-bearing capacity. Increasing flange thickness increases design and installation difficulty and cost, and places very high demands on bolts to ensure sufficient friction. This invention utilizes a steel-concrete composite structure at the flange. In this structure, the steel pipe and concrete have excellent bonding, allowing them to share external loads. The steel pipe restricts the lateral expansion of the concrete core under compression, providing additional bending resistance and thus improving structural performance. The steel-concrete composite structure exhibits high toughness and energy absorption capacity under impact or seismic loads. The steel pipe effectively protects the internal concrete, reducing performance degradation caused by environmental factors such as corrosion and erosion. These advantages of this invention compensate for the stress issues of traditional L-type connections, making it highly suitable for offshore wind power applications.

[0080] In this embodiment, the width of one longitudinal plate of the upper slot member can be smaller than the width of the other longitudinal plate, and the width of one longitudinal plate of the lower slot member can be smaller than the width of the other longitudinal plate, so that multiple sets of upper and lower slot members can be connected end to end to form a ring-shaped connecting module of the tower. Correspondingly, the transverse plates of the upper and lower slot members can be trapezoidal structures, such as isosceles trapezoids.

[0081] In this embodiment, the corresponding plates of the upper and lower groove parts can have the same size. For example, the first horizontal plate and the second horizontal plate have the same size.

[0082] In this embodiment, the connection component may include, for example, Figure 1B The friction plate 31 and the connecting piece 32 shown are both multiple in number. Figure 4 As shown. Connector 32 may include high-strength bolts.

[0083] Multiple friction plates 31 can be attached to the outward-facing surface of the second longitudinal plate 15, and multiple connectors pass through the first longitudinal plate 11, the second longitudinal plate 15 and the friction plates 31 in sequence to connect the three.

[0084] In this embodiment, as Figure 2 As shown, the upper fixing assembly may include multiple first fixing plates 4, which are vertically connected to the first transverse plate 13. Figure 2 As shown, the first fixing plates 4 are parallel to each other, and the first fixing plates 4 are also provided with multiple through holes.

[0085] As one embodiment of the present invention, such as Figure 1AAs shown, the first fixing plate 4 can be connected to the first longitudinal plate 11 ( Figure 2 As shown, the upper flange and the cylindrical plate are parallel and can be connected by connectors (such as high-strength bolts). Correspondingly, the ends of the cylindrical plate are provided with several openings.

[0086] As another embodiment of the present invention, such as Figure 2 and Figure 1B As shown, the first fixing plate 4 can also be perpendicular to the first longitudinal plate 11, and the first fixing plate 4 can form a PBL shear key. That is, the upper flange and the cylinder can be connected by a PBL shear key.

[0087] In this embodiment, as Figure 3 As shown, the lower fixing assembly may include multiple second fixing plates 5, which are vertically connected to the second transverse plate 23. The second fixing plates 5 are parallel to each other, and each second fixing plate 5 has multiple through holes.

[0088] As one embodiment of the present invention, such as Figure 1A As shown, the second fixing plate 5 can be connected to the third longitudinal plate 21 ( Figure 3 As shown, the lower flange and the cylindrical plate are parallel and can be connected by connectors (such as high-strength bolts). Correspondingly, the ends of the cylindrical plate are provided with several openings.

[0089] As another embodiment of the present invention, such as Figure 3 and Figure 1B As shown, the second fixing plate 5 can also be perpendicular to the third longitudinal plate 21, and the second fixing plate 5 can form a PBL shear key. That is, the lower flange and the cylinder can be connected by a PBL shear key.

[0090] like Figure 3 As shown, the second fixing plate 5 is also perpendicular to the third longitudinal plate 21. Of course, the present invention is not limited to this, and it can also be parallel to the third longitudinal plate 21. The second fixing plate 5 can form a PBL shear key.

[0091] Exemplary Example 2

[0092] This exemplary embodiment provides a prefabricated hollow sandwich steel-concrete composite tower.

[0093] The tower may include multiple tower segment modules and multiple ring connection modules.

[0094] The number of cylinder plates included in each tower section module can be an even number of ≥4, such as 4, 6, 8, 16, etc. Figure 5 The eight cylindrical sections 6 shown are arranged around the center line of the tower and connected end to end in sequence.

[0095] The annular connection module is located between two adjacent tower sections. The annular connection module includes multiple tower connection flanges A as described in Exemplary Embodiment 1 above. The multiple tower connection flanges A are connected end to end to form an annular cylinder. The number of tower connection flanges A in each annular connection module can be the same as the number of cylinder plates included in each tower section module, for example, 8.

[0096] In this embodiment, the multiple upper grooves included in each annular connecting module may be integrally formed or not integrally formed. The multiple lower grooves included in each annular connecting module may also be integrally formed or not integrally formed.

[0097] In this embodiment, the number of tower segment modules can be determined based on the actual tower height requirements of the project.

[0098] In this embodiment, the tower also includes multiple annular connecting assemblies. The annular connecting assemblies are disposed between two adjacent tower sections 6, such as... Figure 8 As shown, the annular connecting assembly may include a base 71, a connecting plate 72, and two elastic members 73. The base 71 is mounted as shown in the diagram. Figure 9 On the side of the cylindrical plate 6 shown, a groove is provided on the base 71; one end of the connecting plate 72 is hinged to the groove, and under the action of external force, the elastic element can be located in the groove; one end of the elastic element 73 is connected to the groove, and the other end is connected to the body of the connecting plate 72. The elastic element 73 can be a spring.

[0099] like Figure 9 As shown, one of the side plates on the left and right sides of the cylindrical plate can be welded outwards with circumferential connectors 7 evenly arranged vertically, and the other side plate is provided with multiple connectors such as those matching the circumferential connectors. Figure 10 The hole 9 shown is formed by first drilling a hole in the side plate, then welding the channel steel into the hole to form the hole. The circumferential connector can be inserted into the hole. After the connector is aligned with the hole, the spring on the insertion path is first compressed, and then it springs open after entering the connecting hole, which facilitates the precision of on-site installation, while providing a certain circumferential load-bearing capacity and stiffness.

[0100] In this embodiment, the tower also includes multiple prestressed anchoring components.

[0101] Prestressed anchorage components include, for example Figure 5 and Figure 11 The first anchor 81, the second anchor 82, and the prestressed member 83 are shown. The first anchor 81 and the second anchor 82 may be provided with channels, and both can be fixed to the inner plate of the cylindrical section 6.

[0102] The tower also includes multiple such Figure 5The prestressed member 83 shown has two ends connected to an anchor. The first and second anchors can be fixed to the inner plate of the cylindrical segment 6 by welding or by fixing plates. The prestressed member 83 may include prestressing tendons. The installation process of the prestressed anchoring assembly within a tower segment module may include: welding a prestressed anchoring assembly to the center of the inner plate of each cylindrical segment 6; after the cylindrical segments 6 are spliced ​​around the circumference, adding prestressed members between each pair to enhance circumferential stiffness and strength.

[0103] In this embodiment, the upper end of the cylindrical plate 6 can be fixedly connected to the lower flange, and the lower end can be fixedly connected to the upper flange.

[0104] The cylindrical section can be a hollow sandwich structure, and may include, for example: Figure 6 The outer plate 61, inner plate 62, left side plate 63, and right side plate 64 shown are connected end to end to form a ring-shaped structure. In one embodiment of the invention, the outer plate 61, inner plate 62, left side plate 63, and right side plate 64 can all be made of steel plate.

[0105] As one embodiment of the present invention, such as Figure 7A The cylindrical plate can be connected to the upper and lower flanges using high-strength bolts and other connecting components. Correspondingly, multiple openings can be provided at the upper and lower ends of the cylindrical plate.

[0106] As another embodiment of the present invention, such as Figure 7B As shown, the cylindrical plates and the upper and lower flanges can be interconnected via PBL shear keys. Specifically, this invention can be achieved by using fasteners (such as...) on the inner and outer plates of the cylindrical plates and their upper and lower flanges. Figure 2 The first fixed plate 4 and Figure 3 The second fixing plate 5) in the middle is improved by introducing PBL shear keys. PBL shear keys usually have better ductility and help improve the bonding performance between steel plates and concrete. The fasteners of the upper and lower flanges are connected to the inner and outer steel plates through PBL shear keys with reinforcement. The overall performance of the composite structure is improved by integrated casting, while reducing the openings of the inner and outer steel plates, improving the cross-sectional performance of the steel plates, and facilitating the concrete pouring construction.

[0107] Multiple such welded surfaces are located between the inner and outer plates of the cylinder. Figure 12 The connecting plate 65 shown has multiple through holes and is fixed to the inner plate and / or outer plate of the cylindrical segment. Reinforcing bars can be threaded between the holes on the flange fixing plate and the through holes on the connecting plate to form a single unit. After the unit is connected, it can be cast integrally.

[0108] In one embodiment of the present invention, the connecting orifice plates are in multiple sets, with two plates in each set. The two connecting orifice plates in each set are respectively fixed to the inner and outer plates of the cylindrical plate. Each set of connecting orifice plates can be connected to a fixing plate of a flange, for example... Figure 13 The diagram shows the connection between the connecting perforated plate on the inner plate of the cylindrical shell and the upper and lower flange fasteners; the outer plate of the cylindrical shell is not shown.

[0109] To better understand the above exemplary embodiments, the installation process of the prefabricated hollow sandwich steel-concrete composite tower is further described below.

[0110] First, the inner and outer plates, as well as the left and right plates, are all precision prefabricated in the factory to ensure dimensional accuracy and quality control. This includes: precision-drilled holes in the inner and outer plates (bolt holes for flange connections); welding of prestressed anchors to the center of the inner plate; and welding of circumferential connectors and channel steel ducts to the left and right steel plates (facilitating precise hole alignment during construction and enhancing the tower's circumferential stiffness). Based on this, pre-embedded high-strength bolts are connected to the upper and lower flanges (i.e., the tower connection flanges), and the entire structure is cast in one piece of concrete in the factory, forming a robust joint structure. Furthermore, PBL shear keys can be welded to the outer and inner plates. The inner and outer plates do not require drilling; they can be integrally cast with the PBL shear keys of the upper and lower flanges using concrete, primarily filling the cavity between the inner and outer steel plates and the flanges. The finished product is then manufactured in segments for easy subsequent circumferential and vertical assembly.

[0111] Next, on-site circumferential splicing of adjacent sides was carried out, while maintaining the hoisted state for longitudinal connection: first, blind bolts were inserted into the lower flange; the gaps between the fingers of the upper flange's finger structure in the hoisted state were aligned one by one and moved downwards, allowing the blind bolts to pass through the gaps and through the lower flange; the friction plate was installed on the surface of the lower flange steel plate, and the bolts were tightened to apply sufficient preload. Secondly, after completing one circumferential splice, concrete was poured at the flange, injected from the bottom, with the pouring progress observed through the upper grout outlet; prestressed tendons were added to adjacent tower sections to enhance circumferential stiffness.

[0112] Although the present invention has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A tower section connecting flange, characterized in that The tower tube comprises an upper groove member, a lower groove member, a connecting assembly, an upper fixing assembly and a lower fixing assembly, wherein The upper groove member and the lower groove member are both annular groove structures, the groove opening of the upper groove member faces downward, the groove opening of the lower groove member faces upward, and the two are buckled to form a cylindrical body with a hollow cavity; The connecting assembly can connect the buckled upper and lower groove members together, and the connection mode is a finger-shaped friction connection; The upper fixing assembly is fixed to the upward-facing side of the upper groove member, and the lower fixing assembly is fixed to the downward-facing side of the lower groove member; The upper groove member has a first longitudinal plate, a first inclined plate, a first transverse plate, a second inclined plate and a second longitudinal plate connected in sequence, and the first longitudinal plate and the second longitudinal plate are parallel and both perpendicular to the first transverse plate; The lower groove member comprises a third longitudinal plate, a third inclined plate, a second transverse plate, a fourth inclined plate and a fourth longitudinal plate connected in sequence, and the third longitudinal plate and the fourth longitudinal plate are parallel and both perpendicular to the second transverse plate; One of the first longitudinal plate and the third longitudinal plate is a first finger-shaped plate, and the other is a first multi-hole plate; wherein the first finger-shaped plate has a plurality of slits, and the first multi-hole plate has a plurality of groups of longitudinal holes, the number of groups of longitudinal holes is the same as the number of slits and corresponds one-to-one, and each group of longitudinal holes is opposite to the corresponding slit; 2. The tower section flange of claim 1, wherein One of the second longitudinal plate and the fourth longitudinal plate is a second finger-shaped plate, and the other is a second multi-hole plate; wherein the second finger-shaped plate has a plurality of slits, and the second multi-hole plate has a plurality of groups of longitudinal holes, each group of longitudinal holes includes a plurality of holes, the number of groups of longitudinal holes is the same as the number of slits and corresponds one-to-one, and each group of longitudinal holes is opposite to the corresponding slit.

3. The tower section flange of claim 1, wherein, The connecting assembly comprises a first friction plate, a second friction plate, a first connecting piece and a second connecting piece, wherein The first friction plate is a multi-hole plate, the number of groups of longitudinal holes on the first multi-hole plate is the same as the number of first friction plates and corresponds one-to-one, and each first friction plate is attached to the plate surface of the first finger-shaped plate or the first multi-hole plate; the first connecting piece can connect the first longitudinal plate, the third longitudinal plate and the first friction plate together; 4. The tower section flange of claim 3, wherein, The second friction plate is a multi-hole plate, the number of groups of longitudinal holes on the second multi-hole plate is the same as the number of second friction plates and corresponds one-to-one, and each second friction plate is attached to the plate surface of the second finger-shaped plate or the second multi-hole plate; the second connecting piece can connect the second longitudinal plate, the fourth longitudinal plate and the second friction plate together. At least one grouting hole is formed on the lower groove member, at least one slurry outlet hole is formed on the upper groove member, and the cylindrical body is filled with concrete. The tower tube comprises a plurality of tower segment modules arranged from top to bottom, and at least one annular connecting module, wherein 5. The tower section flange of claim 1, wherein, Each tower segment module comprises a plurality of cylinder pieces arranged around the center line of the tower tube, and the plurality of cylinder pieces are connected in sequence; 6. A fabricated hollow sandwich steel-concrete composite tower drum, characterized in that, The annular connecting module is located between two adjacent tower body segments, and the annular connecting module comprises a plurality of tower tube connecting flanges as claimed in any one of claims 1 to 5, and the plurality of connecting flanges are connected in sequence to form an annular cylindrical body. ​ ​ 7. The fabricated hollow sandwich steel-concrete composite tower drum according to claim 6, characterized in that The tower barrel further comprises a plurality of annular connecting assemblies arranged between two adjacent barrel pieces, each annular connecting assembly comprising a base, a connecting plate and at least one elastic member, wherein The base is mounted on one side of the barrel piece, and a groove is formed in the base, with the groove opening facing away from the side; One end of the connecting plate is hingedly connected to the groove, and the elastic member can be located in the groove under the action of an external force; One end of the elastic member is connected to the groove, and the other end is connected to the body of the connecting plate; The other side of the barrel piece is provided with a hole capable of allowing the annular connecting assembly on the adjacent barrel piece to penetrate.

8. The fabricated hollow sandwich steel-concrete composite tower drum according to claim 6, characterized in that The barrel piece comprises oppositely arranged outer and inner plates, and the barrel piece and the upper and / or lower fixing assemblies of the connecting flange are connected to each other by a reinforced PBL shear key.

9. A wind power structure, characterized in that The wind power structure comprises the fabricated hollow sandwich steel-concrete composite tower barrel according to any one of claims 6 to 8.

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