Fabricated prestressed double steel plate-UHPC combined wind power tower drum and construction method thereof
The pre-stressed double steel plate-UHPC composite tower design addresses the challenges of traditional and mixed towers by providing enhanced structural stiffness, reduced weight, and efficient construction, suitable for high towers and harsh environments.
Patent Information
- Application Number
- CN202510751961.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-07-15
AI Technical Summary
In high tower applications, traditional steel towers have insufficient lateral stiffness, easy to vibrate and resonate, poor local stability, complex manufacturing and high cost; concrete towers are prone to cracking, have large weight, complex construction and high cost, making it difficult to meet the needs of high towers.
The prefabricated prestressed double steel plate-UHPC combined structure is adopted, and the double steel plate-UHPC combined tower segments are stacked, and anti-shelf bonds and prestressed connections are used to combine high-strength steel and ultra-high performance concrete to achieve dry connection and fully prefabricated assembly construction.
Improve the stiffness and seismic performance of the tower, reduce material usage and self-weight, improve durability and construction efficiency, reduce transportation and lifting costs, and is suitable for offshore wind farms in harsh environments.
Smart Images
Figure CN120312499A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of wind power generation, and in particular to a prefabricated prestressed double steel plate-UHPC composite wind power tower barrel and a construction method thereof. Background Art
[0002] With the increasing global demand for clean energy, wind power generation, as a renewable and environmentally friendly energy form, has been widely used. In order to fully develop low-wind-speed areas, ultra-low-wind-speed areas and offshore wind power resources, the single-unit capacity of wind turbines continues to increase, and it is necessary to significantly increase the height of the tower barrel structure to send the nacelle and impeller to high altitudes in order to make full use of the stable wind speed at high altitudes and obtain the best wind energy resources.
[0003] Traditional steel tower barrels have the following problems in high tower applications: First, from the perspective of force, the steel tower barrel has a small lateral stiffness, large amplitude and low frequency, and is prone to resonance with the wind turbine, making it difficult to meet the requirements of high towers in terms of stiffness and vibration control; in addition, the steel tower has a large diameter-thickness ratio and poor local stability, and is prone to local buckling failure under extreme wind loads. Second, from the manufacturing perspective, the wall thickness of the steel tower barrel is large (for example, the wall thickness at the bottom of a 170-meter-high steel tower barrel reaches 80 mm), which increases the welding difficulty and the manufacturing process is complex. Finally, from the perspective of construction cost, in order to improve the bearing capacity and stiffness of the steel tower barrel, it is necessary to increase the wall thickness and the amount of materials, resulting in a significant increase in the construction cost.
[0004] In recent years, hybrid tower barrel structures (that is, the lower tower barrel uses a concrete tower and the upper tower barrel uses a steel tower) have gradually been applied in wind power high towers due to their high stiffness and low construction cost. However, there are still many problems in the actual application of this structure. First, the concrete tower barrel is prone to cracking under complex loads (such as compression, bending, shear, and torsion), and is accompanied by diseases such as spalling and exposed reinforcement, and its durability performance is particularly insufficient. Especially in harsh environments such as offshore wind farms, the long-term stability of the concrete tower barrel is difficult to meet the requirements. Second, the concrete tower barrel is heavy, which not only increases the transportation cost, but also places higher requirements on the lifting equipment capacity, resulting in a significant increase in the lifting cost. In addition, the construction process of the concrete tower barrel is complex, and the on-site wet operation amount is large (such as grouting at the joints), and the construction quality is difficult to control. Finally, the self-weight of the concrete tower barrel significantly increases the foundation engineering volume, not only prolonging the construction period, but also further pushing up the construction cost.
[0005] Therefore, in order to fully develop low-wind-speed areas, ultra-low-wind-speed areas and offshore wind energy resources, and to solve the deficiencies of existing steel tower barrels and hybrid tower barrels in high tower applications, there is an urgent need to develop a new type of wind power tower barrel structure to provide a more efficient and reliable support structure solution for large-capacity wind turbines with a capacity exceeding 10 MW. Summary of the Invention
[0006] The present invention provides an assembled prestressed double - steel - plate - UHPC composite wind power tower suitable for high towers or ultra - high tower barrels and a construction method thereof, which has significant advantages such as less material consumption, light self - weight, large structural stiffness, fully prefabricated and assembled construction, and strong durability, and can effectively solve many problems existing in existing steel tower barrels and hybrid tower barrels.
[0007] On the one hand, the present invention provides an assembled prestressed double - steel - plate - UHPC composite wind power tower, which includes a plurality of double - steel - plate - UHPC composite tower barrel segments. The plurality of double - steel - plate - UHPC composite tower barrel segments are stacked vertically, and the top - most one is the top tower barrel segment. Shear - resistant tooth keys that fit snugly are provided on the UHPC interface between adjacent double - steel - plate - UHPC composite tower barrel segments, and dry connections are achieved between adjacent double - steel - plate - UHPC composite tower barrel segments by bolts, joint glue, and prestress; each double - steel - plate - UHPC composite tower barrel segment includes a plurality of double - steel - plate - UHPC composite plate units. Shear - resistant tooth keys that fit snugly are provided on the UHPC interface between adjacent double - steel - plate - UHPC composite plate units, and dry connections are achieved between adjacent double - steel - plate - UHPC composite plate units by bolts and joint glue.
[0008] Furthermore, the double - steel - plate - UHPC composite plate unit includes a hollow steel shell and UHPC filled inside the hollow steel shell.
[0009] Furthermore, the hollow steel shell includes double - layer steel plates and two evenly - arranged angle steels sandwiched in the middle; one limb of each angle steel is welded to one of the steel plates in the double - layer steel plates to form an integral body, and the other limb of the angle steel is connected to the other steel plate in the double - layer steel plates by rivets.
[0010] Furthermore, round holes are opened on the limb of the angle steel connected by welding, and no through - reinforcement needs to be arranged in the round holes. The angle steel with round holes divides the space between the double - layer steel plates into multiple small cavities; stud bolts are staggered on the inner surfaces of the double - layer steel plates.
[0011] Furthermore, a plurality of metal corrugated pipes are evenly arranged inside the hollow steel shell, and prestressed steel tendons pass through the corrugated pipes and are tensioned.
[0012] Furthermore, the thickness of a single steel plate in the double - layer steel plates is 8 mm to 40 mm.
[0013] Furthermore, a reserved slot is provided at one lateral end of the hollow steel shell, and bolt holes are formed in the double-layer steel plates; a reserved plug is provided at the other lateral end of the hollow steel shell, and bolt holes are reserved on the reserved plug; within one double-steel-plate-UHPC composite tower section, the reserved plugs and the reserved slots of two adjacent double-steel-plate-UHPC composite plate units are mutually and cooperatively inserted; the double-steel-plate-UHPC composite plate unit is provided with an annular slot at one longitudinal end of the hollow steel shell, and bolt holes are formed in the double-layer steel plates; the double-steel-plate-UHPC composite plate unit is provided with an annular plug at the other longitudinal end of the hollow steel shell, and bolt holes are reserved on the annular plug; after a plurality of double-steel-plate-UHPC composite plate units are assembled into one double-steel-plate-UHPC composite tower section, the annular slot and the annular plug are respectively arranged at the two longitudinal ends of the double-steel-plate-UHPC composite tower section.
[0014] Furthermore, a core plate with a thickness equal to the sum of the thicknesses of the double-layer steel plates is arranged at the central part inside the UHPC of the reserved plug and the annular plug. The width of the core plate is twice the width of the reserved plug and the annular plug, and bolt holes identical to the positions of the plug bolt holes are formed in the core plate.
[0015] Furthermore, the nacelle is connected to the top tower section. An annular flange is installed on the end face of the top tower section. The annular flange is welded to the double-layer steel plates of the top tower section; stud nails are welded to the lower end face of the annular flange; embedded bolts are provided at the top end of the top tower section, passing through the bolt holes of the annular flange for subsequent connection with the nacelle flange.
[0016] On the other hand, the present invention provides a construction method for an assembled prestressed double-steel-plate-UHPC composite wind power tower for manufacturing the above-mentioned assembled prestressed double-steel-plate-UHPC composite wind power tower, including the following steps: S1: Precast double-steel-plate-UHPC composite plate units in a factory. The specific processes are as follows: S11, bend two flat steel plates into two arc-shaped steel plates according to the designed shape; S12, uniformly arrange and weld stud nails on the inner surfaces of the two arc-shaped steel plates; S13, weld one limb of the perforated angle steel to one of the arc-shaped steel plates as a whole; S14, position and install the metal corrugated pipe and the core plate on this arc-shaped steel plate; S15, connect the other arc-shaped steel plate to the other limb of the angle steel with rivets to form a complete hollow steel shell structure; S16, place the hollow steel shell vertically, install the end tooth key template, pour the internal UHPC and cure it. S2: Transport the double - steel - plate / UHPC composite plate units to the wind farm and splice multiple composite plate units into a single tower section on site. The specific processes are as follows: S21. Uniformly apply joint sealant to the UHPC end surface of the vertical plugs of the composite plate units; S22. Insert the vertical plugs into the vertical slots of adjacent plate units; S23. Install and tighten the high - strength bolts at the splicing joints. S3: Use a lifting device or facility to lift the tower section to be installed and splice it with the previously installed upper tower section. The specific processes are as follows: S31. Pass the prestressed steel strands through the corrugated pipes inside the tower section to be installed; S32. Uniformly apply joint sealant to the UHPC end surface of the annular plugs at the top of the already installed tower section; S33. Insert the annular slots of the tower section to be installed into the annular plugs; S34. Install and tighten the high - strength bolts at the splicing joints; S35. Tension the prestressed steel strands. S4: Repeat S3 until the installation of the last (top) tower section is completed, but temporarily do not tension the prestressed steel strands of the top tower section. S5: Lift the nacelle and connect it to the flange of the top tower section through embedded bolts, tension the prestressed steel strands of the top tower section, and anchor the prestressed steel strands on the top surface of the flange of the nacelle to enhance the connection between the nacelle and the tower and avoid fatigue fracture failure of the flange connection.
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Improve the stiffness and seismic performance of the tower: By adopting the prestressed double - steel - plate / UHPC composite structure, not only can the stiffness and vibration frequency of the tower be improved, solving the vibration control problem of traditional steel towers, but also the post - earthquake recovery ability of the tower is greatly improved by the setting of prestress, significantly enhancing the structural toughness.
[0018] (2) Reduce the material consumption and self - weight: By using high - strength steel and ultra - high - performance concrete (UHPC), the material consumption is significantly reduced, and at the same time, the structural self - weight is greatly reduced. The self - weight of the structure of the present invention is close to that of the steel tower and far lower than that of the hybrid tower. The reduction of self - weight not only reduces the foundation project quantity, but also significantly reduces the transportation cost and hoisting weight, thus reducing the temporary measure cost during construction.
[0019] (3) Realize full prefabricated and assembled construction: The outer double - steel plates serve as the formwork for the internal UHPC pouring, enabling the tower to be fully prefabricated in the factory and only requiring assembly construction on site, avoiding on - site wet concrete operations, thus ensuring controllable construction quality. The full prefabricated and assembled construction method greatly improves the construction efficiency and simplifies the construction process.
[0020] (4) Improve durability and service life: The internal UHPC is wrapped by double steel plates on the outside, effectively avoiding problems such as concrete cracking and damage. At the same time, by isolating from the external environment, the durability and service life of the tower barrel are greatly improved, especially suitable for offshore wind farms with harsh environments. Description of the Drawings
[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0022] Figure 1 It is a schematic structural diagram of a prefabricated prestressed double steel plate-UHPC composite wind turbine tower barrel according to an embodiment of the present invention; Figure 2 It is a schematic diagram of a double steel plate-UHPC composite tower barrel segment according to an embodiment of the present invention; Figure 3 It is a cross-sectional view of a double steel plate-UHPC composite tower barrel segment according to an embodiment of the present invention; Figure 4 It is a schematic diagram of a double steel plate-UHPC composite plate unit according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the hollow steel shell of a double steel plate-UHPC composite plate unit according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the top tower barrel segment according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the connection between the nacelle and the top tower barrel segment according to an embodiment of the present invention.
[0023] Description of the Reference Numerals: 1: Double steel plate-UHPC composite tower barrel segment; 2: Top tower barrel segment; 3: Double steel plate-UHPC composite plate unit; 4: Outer steel plate; 5: Inner steel plate; 6: Metal corrugated pipe; 7: UHPC; 8: Core plate; 9: Angle steel; 10: Stud; 11: Shear key; 12: Keyway; 13: Bolt hole; 14: Rivet; 15: Reserved plug; 16: Reserved slot; 17: Ring plug; 18: Ring slot; 19: Ring flange; 20: Nacelle flange; 21: Embedded bolt; 22: Anchor; 23: Hollow steel shell. Detailed Embodiments
[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.
[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0027] As Figures 1 to 6 shown, the embodiment of the present invention provides a prefabricated prestressed double steel plate-UHPC composite wind power tower barrel, which includes a plurality of double steel plate-UHPC composite tower barrel segments 1. The plurality of double steel plate-UHPC composite tower barrel segments 1 are stacked vertically, and the topmost one is the top tower barrel segment 2. Shear resistance tooth keys 11 that fit with each other in a concave-convex manner are provided on the UHPC interface between adjacent double steel plate-UHPC composite tower barrel segments 1, and dry connection is achieved between adjacent double steel plate-UHPC composite tower barrel segments 1 by bolts, joint glue, and prestress.
[0028] Each of the double - steel - plate - UHPC composite tower sections 1 includes multiple double - steel - plate - UHPC composite plate units 3. Shear - resistant tooth keys 11 with concave - convex matching are arranged on the UHPC interface between adjacent double - steel - plate - UHPC composite plate units 3, and adjacent double - steel - plate - UHPC composite plate units 3 are dry - connected by bolts and joint glue.
[0029] Shear - resistant tooth keys 11 with concave - convex matching are arranged on the UHPC interfaces between adjacent tower sections and between adjacent plate units, which are used to jointly resist the shear force generated at the interface under torsion and bending.
[0030] Adopting the prestressed double - steel - plate - UHPC composite structure can not only improve the stiffness and vibration frequency of the tower, solve the vibration control problem of traditional steel towers, but also significantly improve the post - earthquake recovery ability of the tower and enhance the structural toughness.
[0031] In some preferred embodiments, the double - steel - plate - UHPC composite plate unit 3 includes a hollow steel shell 23 and UHPC 7 filled inside the hollow steel shell 23. The thickness of the double - steel - plate - UHPC composite plate unit 3 is generally 100 mm - 300 mm.
[0032] By using high - strength steel and ultra - high - performance concrete (UHPC), the material consumption is significantly reduced, and at the same time, the structural self - weight is greatly reduced. The structural self - weight of the present invention is close to that of the steel tower and far lower than that of the hybrid tower. The reduction of self - weight not only reduces the foundation engineering quantity, but also significantly reduces the transportation cost and hoisting weight, thus reducing the temporary measure cost during construction.
[0033] In some preferred embodiments, the hollow steel shell 23 includes a double - layer steel plate and two evenly arranged angle steels 9 sandwiched between them. One limb of each angle steel 9 is welded to one of the steel plates in the double - layer steel plate to form an integral body, and the other limb of the angle steel 9 is connected to the other steel plate in the double - layer steel plate by rivets 14. The double - layer steel plate includes an outer steel plate 4 and an inner steel plate 5.
[0034] The outer double - layer steel plate serves as a formwork for the internal UHPC pouring, enabling the tower to be prefabricated entirely in the factory and only requiring assembly construction on site, avoiding on - site wet concrete operations, thus ensuring controllable construction quality. The fully prefabricated and assembled construction method greatly improves the construction efficiency and simplifies the construction process.
[0035] The internal UHPC is covered by the outer double - layer steel plate, effectively avoiding problems such as concrete cracking and damage. At the same time, through isolation from the external environment, the durability and service life of the tower are greatly improved, especially suitable for offshore wind farms with harsh environments.
[0036] The angle steel 9 is provided with round holes on one limb connected by welding to form an opening plate connector, strengthening the combined action of the double-layer steel plate and UHPC. There is no need to arrange through reinforcement bars in the round holes of the opening angle steel 9, and the opening angle steel 9 divides the space between the double-layer steel plates into multiple small cavities; stud bolts 10 are arranged in a staggered manner on the inner surfaces of the double-layer steel plates; the opening angle steel 9 and the stud bolts 10 can not only achieve the coordinated bearing of the steel plate and UHPC, but also ensure that the steel plate does not undergo local buckling before yielding.
[0037] In some preferred embodiments, a plurality of metal bellows 6 are uniformly arranged inside the hollow steel shell 23, and the prestressed steel bundles pass through and are tensioned in the bellows 6. The prestressed bundles arranged in the structure body can not only retain the advantage that the prestress loss of the external prestressed bundles can be compensated by post-tensioning in the later stage, but also avoid the complex structure in the arrangement of external prestressed tendons, and at the same time be isolated from the external environment, so that the prestressed bundles are not easily corroded.
[0038] The minimum thickness of the double-layer steel plate is generally not less than 8 mm to facilitate the control of out-of-plane deformation, and the maximum thickness is generally not more than 40 mm to ensure the welding performance.
[0039] In some preferred embodiments, the connection between the double steel plate-UHPC plate units 3 is realized by high-strength bolts and joint sealant to achieve dry connection. When each double steel plate-UHPC plate unit 3 is prefabricated, a reserved slot 16 is arranged at one transverse end of the hollow steel shell 23, and bolt holes are opened on the double-layer steel plate; a reserved plug 15 is arranged at the other transverse end of the hollow steel shell 23, and bolt holes are reserved on the reserved plug 15. When a plurality of double steel plate-UHPC plate units 3 are connected, first evenly apply joint sealant on the UHPC end face, then insert the reserved plug 15 into the adjacent reserved slot 16, and finally insert high-strength bolts into the bolt holes 13 for connection. The length of the reserved plug is generally between 2 and 3 times the thickness of the plate unit.
[0040] In some preferred embodiments, dry connections are achieved between multiple double - steel - plate - UHPC composite tower sections 1 by using high - strength bolts, joint sealant, and prestress. Inside one double - steel - plate - UHPC composite tower section 1, the reserved plugs 15 and the reserved slots 16 of two adjacent double - steel - plate - UHPC composite plate units 3 cooperate with each other for insertion. When each double - steel - plate - UHPC composite plate unit 3 is prefabricated, the double - steel - plate - UHPC composite plate unit 3 is provided with an annular slot 18 at one longitudinal end of the hollow steel shell 23, and bolt holes are opened on the double - layer steel plate; the double - steel - plate - UHPC composite plate unit 3 is provided with an annular plug 17 at the other longitudinal end of the hollow steel shell 23, and bolt holes 13 are reserved on the annular plug 17; after multiple double - steel - plate - UHPC composite plate units 3 are assembled into one double - steel - plate - UHPC composite tower section 1, the annular slot 18 and the annular plug 17 are respectively at the two longitudinal ends of the double - steel - plate - UHPC composite tower section 1. When connecting the double - steel - plate - UHPC composite tower sections 1, first evenly apply joint sealant on the UHPC end face, then insert the annular plug 17 into the annular slot 18 of the adjacent tower section, and finally insert high - strength bolts into the bolt holes 13 for connection. The length of the annular plug 17 is generally between 2 and 3 times the thickness of the plate unit.
[0041] In some preferred embodiments, a core plate 8 with a thickness equal to the sum of the thicknesses of the double - layer steel plate is arranged at the central part inside the UHPC of the plug. The core plate 8 is inserted into the composite plate to ensure reliable and smooth transfer of internal forces at the connection part. The width of the core plate 8 is 2 times the width of the plug. Bolt holes 13 identical to the positions of the plug bolt holes are opened on the core plate 8 to facilitate the passing of bolts.
[0042] In some preferred embodiments, the nacelle is connected to the top tower section 2, and an annular flange 19 is installed on the end face of the top tower section 2. The annular flange 19 is welded to the double - layer steel plate of the top tower section 2. Studs 10 are welded to the lower end face of the annular flange 19 for connection with the internal UHPC of the tower section. Anchor bolts 21 are embedded at the top of the top tower section 2, passing through the bolt holes of the annular flange 19 for subsequent connection with the flange 20 of the nacelle.
[0043] The present invention also provides a construction method for an assembled prestressed double - steel - plate - UHPC composite wind turbine tower, including: S1: Prefabricate the double - steel - plate - UHPC composite plate unit 3 in the factory. The specific processes are as follows: S11 Bend two flat steel plates into two arc - shaped steel plates according to the design shape → S12 Uniformly arrange and weld the stud bolts 10 on the inner surfaces of the two arc - shaped steel plates → S13 Weld one limb of the perforated angle steel 9 to one of the arc - shaped steel plates to form an integral whole → S14 Position and install the metal corrugated pipe 6 and the core plate 8 on this arc - shaped steel plate → S15 Connect the other arc - shaped steel plate to the other limb of the angle steel 9 with the rivets 14 to form a complete hollow steel shell structure 23 → S16 Place the hollow steel shell vertically and install the end tooth key 11 formwork → S17 Pour the internal UHPC and cure it.
[0044] S2: Transport the double - steel - plate - UHPC composite plate unit to the wind farm and splice multiple composite plate units 3 into a single tower barrel segment on - site. The specific processes are as follows: S21 Uniformly apply the joint sealant on the UHPC end face of the vertical plug 15 of the composite plate unit → S22 Insert the vertical plug 15 into the vertical slot 16 of the adjacent plate unit → S23 Install the high - strength bolts at the splicing position and tighten them.
[0045] S3: Use a lifting device or facility to lift the tower barrel segment to be installed and splice it with the previously installed upper tower barrel segment. The specific processes are as follows: S31 Pass the prestressed steel strand through the corrugated pipe 6 inside the tower barrel segment to be installed → S32 Uniformly apply the joint sealant on the UHPC end face of the annular plug 17 at the top of the already installed tower barrel → S33 Insert the annular slot 18 of the tower barrel segment to be installed into the annular plug 17 → S34 Install the high - strength bolts at the splicing position and tighten them → S35 Tension the prestressed steel strand.
[0046] S4: Repeat step 3 until the installation of the last (top) tower barrel segment 2 is completed, but temporarily do not tension the prestressed steel strand of the top tower barrel segment.
[0047] S5: Lift the nacelle and connect it to the flange 19 of the top tower barrel segment through the embedded bolts 21, tension the prestressed steel strand of the top tower barrel segment, and anchor the prestressed steel strand on the top surface of the flange 20 of the nacelle to enhance the connection between the nacelle and the tower barrel and avoid the fatigue fracture failure of the flange connection.
[0048] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. An assembled prestressed double steel plate-UHPC composite wind power tower barrel, characterized in that, It includes multiple double steel plate-UHPC composite tower barrel segments (1), and the multiple double steel plate-UHPC composite tower barrel segments (1) are stacked vertically. The topmost one is the top tower barrel segment (2). Shear-resistant tooth keys (11) with concave-convex matching are arranged on the UHPC interface between adjacent double steel plate-UHPC composite tower barrel segments (1), and dry connection is achieved between adjacent double steel plate-UHPC composite tower barrel segments (1) by bolts, joint sealant and prestress; Each double steel plate-UHPC composite tower barrel segment (1) includes multiple double steel plate-UHPC composite plate units (3). Shear-resistant tooth keys (11) with concave-convex matching are arranged on the UHPC interface between adjacent double steel plate-UHPC composite plate units (3), and dry connection is achieved between adjacent double steel plate-UHPC composite plate units (3) by bolts and joint sealant.
2. The prefabricated prestressed double steel plate-UHPC composite wind power tower barrel according to claim 1, wherein The double steel plate-UHPC composite plate unit (3) includes a hollow steel shell (23) and UHPC (7) filled inside the hollow steel shell (23).
3. The prefabricated prestressed double steel plate-UHPC composite wind power tower barrel according to claim 2, characterized in that, The hollow steel shell (23) includes double-layer steel plates and two evenly arranged angle steels (9) sandwiched in the middle; one limb of each angle steel (9) is welded to one of the double-layer steel plates to form an integral body, and the other limb of the angle steel (9) is connected to the other double-layer steel plate by blind rivets (14).
4. The prefabricated prestressed double steel plate-UHPC composite wind power tower barrel according to claim 3, characterized in that, Round holes are opened on the limb of the angle steel (9) connected by welding, and no through reinforcement is arranged in the round holes. The angle steel (9) with round holes divides the space between the double-layer steel plates into multiple small cavities; stud bolts (10) are arranged staggeredly on the inner surfaces of the double-layer steel plates.
5. The prefabricated prestressed double steel plate-UHPC composite wind power tower barrel according to claim 2, wherein Multiple metal bellows (6) are evenly arranged inside the hollow steel shell (23), and prestressed steel tendons pass through and are tensioned in the metal bellows (6).
6. The prefabricated prestressed double steel plate-UHPC composite wind power tower barrel according to claim 2, wherein, The thickness of a single steel plate of the double-layer steel plates is 8 mm to 40 mm.
7. The prefabricated prestressed double steel plate-UHPC composite wind power tower barrel according to claim 2, characterized in that, A reserved slot (16) is provided at one lateral end of the hollow steel shell (23), and bolt holes (13) are formed in the double-layer steel plates; a reserved plug (15) is provided at the other lateral end of the hollow steel shell (23), and bolt holes (13) are reserved on the reserved plug (15); within one double-steel plate-UHPC combined tower section (1), the reserved plugs (15) and the reserved slots (16) of two adjacent double-steel plate-UHPC combined plate units (3) are inserted into each other in a matching manner; a ring slot (18) is provided at one longitudinal end of the double-steel plate-UHPC combined plate unit (3) on the hollow steel shell (23), and bolt holes (13) are formed in the double-layer steel plates; a ring plug (17) is provided at the other longitudinal end of the double-steel plate-UHPC combined plate unit (3) on the hollow steel shell (23), and bolt holes (13) are reserved on the ring plug (17); after a plurality of double-steel plate-UHPC combined plate units (3) are assembled into one double-steel plate-UHPC combined tower section (1), the ring slot (18) and the ring plug (17) are respectively at the two longitudinal ends of the double-steel plate-UHPC combined tower section (1).
8. The prefabricated prestressed double steel plate-UHPC composite wind power tower barrel according to claim 7, wherein, A core plate (8) with a thickness equal to the sum of the thicknesses of the double-layer steel plates is provided at the central part inside the UHPC (7) of the reserved plug (15) and the ring plug (17). The width of the core plate (8) is twice the width of the reserved plug (15) and the ring plug (17), and bolt holes (13) identical in position to the plug bolt holes are formed in the core plate (8).
9. The prefabricated prestressed double steel plate-UHPC composite wind power tower barrel according to claim 1, wherein, The nacelle is connected to the top tower section (2). A ring flange (19) is installed on the end face of the top tower section (2), and the ring flange (19) is welded to the double-layer steel plates of the top tower section (2); stud bolts (10) are welded to the lower end face of the ring flange (19); embedded bolts (21) are provided at the top end of the top tower section (2), passing through the bolt holes (13) of the ring flange (19) for subsequent connection to the nacelle flange (20).
10. A construction method for an assembled prestressed double steel plate-UHPC composite wind power tower barrel, which is used to manufacture the assembled prestressed double steel plate-UHPC composite wind power tower barrel according to any one of claims 1 to 9, characterized in that, It includes the following steps: S1: Pre-fabricate double-steel plate-UHPC combined plate units in a factory. The specific processes are as follows: S11. Bend two flat steel plates into two arc-shaped steel plates according to the designed shape; S12. Uniformly arrange and weld stud bolts on the inner surfaces of the two arc-shaped steel plates; S13. Weld one limb of the perforated angle steel to one of the arc-shaped steel plates as a whole; S14. Position and install the metal corrugated pipe and the core plate on this arc-shaped steel plate; S15. Connect the other arc-shaped steel plate to the other limb of the angle steel with rivets to form a complete hollow steel shell structure; S16. Vertically place the hollow steel shell, install the end key templates, pour the internal UHPC and cure it. S2: Transport the double - steel - plate / UHPC composite plate units to the wind farm and splice multiple composite plate units into a single tower section on site. The specific processes are as follows: S21. Uniformly apply joint sealant to the UHPC end face of the vertical plug of the composite plate unit; S22. Insert the vertical plug into the vertical slot of the adjacent plate unit; S23. Install and tighten the high - strength bolts at the splicing joint. S3: Use a lifting device or facility to lift the tower section to be installed and splice it with the previously installed upper tower section. The specific processes are as follows: S31. Pass the prestressed steel strand through the corrugated pipe inside the tower section to be installed; S32. Uniformly apply joint sealant to the UHPC end face of the annular plug at the top of the already installed tower section; S33. Insert the annular slot of the tower section to be installed into the annular plug; S34. Install and tighten the high - strength bolts at the splicing joint; S35. Tension the prestressed steel strand. S4: Repeat S3 until the installation of the last (top) tower section is completed, but temporarily do not tension the prestressed steel strand of the top tower section. S5: Lift the nacelle and connect it to the flange of the top tower section through embedded bolts, tension the prestressed steel strand of the top tower section, and anchor the prestressed steel strand on the top surface of the flange of the nacelle to enhance the connection between the nacelle and the tower and avoid fatigue fracture failure of the flange connection.