A spiral steel pipe straight pipe and cone pipe combined tower drum

Abstract

The utility model relates to wind generating set tower drum technical field especially relates to a spiral steel pipe straight pipe and conical pipe combined tower drum, including wind power base, straight pipe tower drum, conical pipe tower drum and connecting flange, straight pipe tower drum sets up in the upper end of wind power base, straight pipe tower drum is provided with multiple groups, multiple straight pipe tower drums are linear arrangement evenly up and down, and the side wall of straight pipe tower drum is provided with weld joint, and the weld joint is helical distribution, and the conical pipe tower drum sets up in the upper end of the uppermost straight pipe tower drum, and both ends of conical pipe tower drum and straight pipe tower drum are provided with connecting flange, the utility model discloses a straight pipe tower drum and conical pipe tower drum combination use constitute integral wind power tower drum structure, can effectively improve production efficiency, reduce production cost while guaranteeing tower drum structure stability, and the weld joint of straight pipe tower drum periphery helical can effectively strengthen the torsional property of straight pipe tower drum, can avoid the stress concentration under the alternating load of traditional straight seam welding simultaneously, improves the overall strength of tower drum structure.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine tower technology, and in particular to a tower composed of a spiral steel pipe, a straight pipe and a tapered pipe. Background Technology

[0002] Currently, the tower structure of small and medium-sized wind turbine generators mainly adopts a pure steel cylinder tower structure. The pure steel tower of small and medium-sized wind turbines is mainly composed of multiple tower sections with longitudinal welds. Flanges are welded at both ends of the tower sections, and the tower sections are connected by flanges.

[0003] Currently, tower sections typically come in two forms: tapered tube towers and straight tube towers. While tapered tube towers offer good structural stability, their manufacturing process is complex and costly. Straight tube towers, on the other hand, are simple to manufacture but have poor wind resistance and experience significant top vibration.

[0004] Therefore, to address the above issues, a combined spiral steel pipe and tapered pipe tower can be designed. By combining the straight pipe tower and the tapered pipe tower, production efficiency can be effectively improved and production costs reduced while ensuring the stability of the tower structure. Furthermore, the straight pipe section of the tower section adopts a spiral weld design, which effectively enhances the torsional resistance of the straight pipe tower and avoids stress concentration under alternating loads, as is the case with traditional straight seams. Utility Model Content

[0005] To overcome the current problems of tower sections typically having two forms, tapered tube towers and straight tube towers, tapered tube towers have good structural stability but complex manufacturing processes and high costs, while straight tube towers are simple to manufacture but have poor wind resistance and large top vibrations.

[0006] The technical solution of this utility model is as follows: a spiral steel pipe combined with a straight pipe and a tapered pipe tower, including a wind power foundation, a straight pipe tower, a tapered pipe tower and connecting flanges. The straight pipe tower is set at the upper end of the wind power foundation, and multiple sets of straight pipe towers are set. The multiple sets of straight pipe towers are evenly arranged linearly from top to bottom. The side wall of the straight pipe tower is provided with welded seams, which are distributed in a spiral shape. The tapered pipe tower is set at the upper end of the uppermost straight pipe tower. Both ends of the tapered pipe tower and the straight pipe tower are provided with connecting flanges.

[0007] Preferably, multiple sets of straight pipe towers, tapered pipe towers, and wind turbine foundations can be connected and fixed by setting connecting flanges and bolts. The wind turbine tower structure is formed by setting multiple sets of straight pipe towers and one set of tapered pipe towers. The wind turbine is supported and installed by the tapered pipe tower. The combination of straight pipe towers and tapered pipe towers can effectively improve production efficiency and reduce production costs while ensuring the stability of the tower structure. The straight pipe towers are welded by setting weld seams. The spiral structure of the weld seams can effectively enhance the torsional resistance of the straight pipe towers and avoid stress concentration under alternating loads in traditional straight seam welding.

[0008] Preferably, multiple sets of reinforcing ribs are fixedly installed on one side of the connecting flange, and the multiple sets of reinforcing ribs are evenly arranged circumferentially around the axis of the connecting flange.

[0009] Preferably, multiple sets of reinforcing ribs and flange holes of the connecting flange are arranged in an alternating pattern.

[0010] As a preferred option, multiple sets of reinforcing rings are fixedly installed inside the straight-tube tower, and these reinforcing rings are arranged linearly in the upper and lower sections.

[0011] Preferably, the surface of the reinforcing ring has four sets of through holes, which are evenly arranged in a circle around the axis of the reinforcing ring.

[0012] As a preferred option, the side wall of the lowest straight-tube tower is equipped with an inspection door, and a staircase is provided between the inspection door and the wind turbine foundation.

[0013] Preferably, ladders are fixedly installed inside both straight-tube and tapered-tube towers.

[0014] The beneficial effects of this utility model are:

[0015] 1. Multiple sets of straight pipe towers, tapered pipe towers, and wind turbine foundations can be connected and fixed using connecting flanges and bolts. According to the actual height design requirements, multiple sets of straight pipe towers and one set of tapered pipe towers can be connected and combined to form an integrated wind turbine tower structure. The tapered pipe tower is located at the top and is used to install and fix the wind turbine equipment. By using straight pipe towers and tapered pipe towers in combination, the stability of the tower structure can be ensured while effectively improving production efficiency and reducing production costs. The tapered pipe tower can effectively reduce top vibration when installing the wind turbine.

[0016] 2. The straight pipe tower is welded into shape through welded seams. The spiral structure of the welded seams can effectively enhance the torsional resistance of the straight pipe tower and avoid stress concentration under alternating loads as is common in traditional straight seam welding, thereby improving the overall stability of the wind turbine tower structure. Attached Figure Description

[0017] Figure 1 The diagram shown is a first three-dimensional structural schematic of the spiral steel pipe combined with a straight pipe and a tapered pipe of this utility model.

[0018] Figure 2 The diagram shown is a three-dimensional cross-sectional view of the spiral steel pipe combined with a straight pipe and a tapered pipe of this utility model.

[0019] Figure 3 The diagram shown is a three-dimensional structural schematic of the reinforcing ring of the spiral steel pipe combined with the straight pipe and tapered pipe of this utility model.

[0020] Figure 4The diagram shown is a three-dimensional structural schematic of the spiral steel pipe straight pipe and tapered pipe combined tower connecting flange of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Wind turbine foundation; 2. Straight pipe tower; 201. Welded seam; 3. Tapered pipe tower; 4. Connecting flange; 401. Reinforcing rib; 5. Reinforcing ring; 501. Through hole; 6. Inspection door; 601. Staircase; 7. Ladder. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figure 1 and Figure 2 This utility model provides an embodiment: a spiral steel pipe combined with a straight pipe and a tapered pipe tower, including a wind turbine foundation 1, a straight pipe tower 2, a tapered pipe tower 3, and connecting flanges 4. The straight pipe tower 2 is located at the upper end of the wind turbine foundation 1, and multiple sets of straight pipe tower 2 are arranged linearly and evenly from top to bottom. The side walls of the straight pipe tower 2 are provided with welded seams 201, which are spirally distributed. The tapered pipe tower 3 is located at the uppermost end of the straight pipe tower 2. Both ends of the tapered pipe tower 3 and the straight pipe tower 2 are provided with connecting flanges 4. The multiple sets of straight pipes can be connected by using bolts with the connecting flanges 4. The tower 2, the tapered tower 3, and the wind turbine foundation 1 are connected and fixed together. The wind turbine tower structure is formed by setting multiple sets of straight tower 2 and one set of tapered tower 3. The wind turbine is supported and installed by the tapered tower 3. The combination of straight tower 2 and tapered tower 3 can effectively improve production efficiency and reduce production costs while ensuring the stability of the wind turbine tower structure. The straight tower 2 is welded by setting a weld seam 201. The spiral structure of the weld seam 201 can effectively enhance the torsional resistance of the straight tower 2 and avoid stress concentration under alternating loads in traditional straight seam welding.

[0024] Please see Figure 2 , Figure 3 and Figure 4In this embodiment, multiple sets of reinforcing ribs 401 are fixedly installed on one side of the connecting flange 4. The multiple sets of reinforcing ribs 401 are evenly arranged circumferentially around the axis of the connecting flange 4, and the multiple sets of reinforcing ribs 401 are staggered with the flange holes of the connecting flange 4. By setting the reinforcing ribs 401, the structural strength of the connecting flange 4 can be guaranteed, thereby ensuring the stability of the connection of the connecting flange 4. Multiple sets of reinforcing rings 5 ​​are fixedly installed inside the straight pipe tower 2. The multiple sets of reinforcing rings 5 ​​are arranged linearly up and down. Four sets of through holes 501 are opened on the surface of the reinforcing rings 5. The four sets of through holes 501 are evenly arranged circumferentially around the axis of the reinforcing rings 5. By setting the reinforcing rings 5, the structural strength of the straight pipe tower 2 can be improved. At the same time, it provides a place for maintenance when relevant operators climb the tower. The through holes 501 facilitate the restriction of the wind turbine related lines passing through the wind turbine tower.

[0025] Please see Figure 1 and Figure 2 In this embodiment, an inspection door 6 is provided on the side wall of the lowest straight pipe tower 2, and a staircase 601 is provided between the inspection door 6 and the wind power foundation 1; the staircase 601 facilitates relevant operators to enter the interior of the tower through the inspection door 6; ladders 7 are fixedly installed inside the straight pipe tower 2 and the tapered pipe tower 3; the ladders 7 facilitate relevant operators to climb the tower from the inside of the overall wind power tower.

[0026] During operation, multiple sets of straight pipe towers 2, tapered pipe towers 3 and wind turbine foundation 1 can be connected and fixed using connecting flanges 4 and bolts. According to the actual height design requirements, multiple sets of straight pipe towers 2 and one set of tapered pipe towers 3 can be connected and combined to form an overall wind turbine tower structure. The tapered pipe tower 3 is located at the top for installing and fixing the wind turbine equipment.

[0027] By combining straight tube tower 2 and tapered tube tower 3, production efficiency can be effectively improved and production costs reduced while ensuring the stability of the tower structure.

[0028] The straight pipe tower 2 is welded and formed using weld seam 201. The spiral structure of weld seam 201 can effectively enhance the torsional resistance of the straight pipe tower 2, while avoiding stress concentration under alternating loads in traditional straight seam welding, thereby improving the overall stability of the wind turbine tower structure.

[0029] Through the above steps, the combined use of straight pipe tower 2 and tapered pipe tower 3 to form an integrated wind turbine tower structure can effectively improve production efficiency and reduce production costs while ensuring the stability of the tower structure. The spiral weld on the outer periphery of the straight pipe tower 2 can effectively enhance its torsional resistance and avoid stress concentration under alternating loads in traditional straight seam welding, thereby improving the overall strength of the tower structure. This addresses the current problem that tower sections typically come in two forms: tapered pipe tower 3 and straight pipe tower 2. While tapered pipe tower 3 has good structural stability, its manufacturing process is complex and its cost is high. While straight pipe tower 2 is simple to manufacture, its wind resistance is poor and its top vibration is large.

[0030] Example 1:

[0031] Optionally, this utility model provides an embodiment of the conventional installation of a basic tower:

[0032] Please see Figure 1 and Figure 2 This utility model provides an embodiment: a spiral steel pipe combined with a straight pipe and a tapered pipe combined tower, including a wind power foundation 1, a straight pipe tower 2, a tapered pipe tower 3, and a connecting flange 4. The straight pipe tower 2 is located at the upper end of the wind power foundation 1, and multiple sets of straight pipe towers 2 are arranged linearly and evenly from top to bottom. The side wall of the straight pipe tower 2 is provided with a welded seam 201, which is spirally distributed. The tapered pipe tower 3 is located at the uppermost end of the straight pipe tower 2, and both ends of the tapered pipe tower 3 and the straight pipe tower 2 are provided with connecting flanges 4.

[0033] This embodiment uses a three-section straight pipe tower 2, each section is 12m long, 4.2m in outer diameter, and 20mm thick. It adopts the spiral welding seam 201 process with a pitch of 300mm and a weld leg height of 8mm. Each section of the straight pipe tower 2 is equipped with 3 sets of Φ4000×16mm annular reinforcing rings 5 ​​with a through hole spacing of 200mm. Each section of the straight pipe tower 2 is connected by PN100 grade connecting flanges 4, and the connecting flange 4 plate is equipped with eight sets of reinforcing ribs 401.

[0034] The top of the uppermost straight tube tower 2 is connected to a PN100-grade connecting flange 4, which connects to a section of tapered tube tower 3. The upper bottom diameter is 3.8m, the lower bottom diameter is 4.2m, the taper is 6°, and the height is 8m. The wall thickness of the tapered tube decreases linearly from 25mm at the bottom to 18mm at the top.

[0035] The straight pipe tower 2, the tapered pipe tower 3, and the connecting flange 4 are all made of Q345B steel.

[0036] Compared to traditional straight seam welding, its torsional stiffness is 2.1 × 10⁻⁶. 6 kN·m², increased by 27%, fatigue life: ≥2×10 6 Second-rate.

[0037] Example 2:

[0038] Optionally, this utility model provides another embodiment: a high-strength offshore wind turbine tower.

[0039] Please see Figure 1 and Figure 2 This utility model provides an embodiment: a spiral steel pipe combined with a straight pipe and a tapered pipe combined tower, including a wind power foundation 1, a straight pipe tower 2, a tapered pipe tower 3, and a connecting flange 4. The straight pipe tower 2 is located at the upper end of the wind power foundation 1, and multiple sets of straight pipe towers 2 are arranged linearly and evenly from top to bottom. The side wall of the straight pipe tower 2 is provided with a welded seam 201, which is spirally distributed. The tapered pipe tower 3 is located at the uppermost end of the straight pipe tower 2, and both ends of the tapered pipe tower 3 and the straight pipe tower 2 are provided with connecting flanges 4.

[0040] This embodiment uses a five-section straight-tube tower 2, each section being 15m long and 5.0m in outer diameter. The straight-tube tower 2 adopts a variable wall thickness design, from 25mm to 20mm.

[0041] The straight-tube tower 2 adopts a double-helix cross-arranged spiral welded seam 201, with a pitch of 250mm and a phase difference of 90°.

[0042] A section of tapered tube tower 3 is used, which is connected above the uppermost straight tube tower 2. The tapered tube tower 3 has a taper of 8°, a height of 10m, and a wall thickness of 30mm.

[0043] The straight pipe tower 2 is connected to both the straight pipe tower 2 and the tapered pipe tower 3 using connecting flanges 4, with appropriate bolts: M56×300;

[0044] Twelve sets of T-shaped ribs, 25mm thick and 200mm high, are added to one side of the flange to ensure the connection strength between the straight pipe tower 2 and between the straight pipe tower 2 and the tapered pipe tower 3.

[0045] Example 3:

[0046] Optionally, this utility model provides another embodiment: a lightweight mountain tower.

[0047] Please see Figure 1 and Figure 2 This utility model provides an embodiment: a spiral steel pipe combined with a straight pipe and a tapered pipe combined tower, including a wind power foundation 1, a straight pipe tower 2, a tapered pipe tower 3, and a connecting flange 4. The straight pipe tower 2 is located at the upper end of the wind power foundation 1, and multiple sets of straight pipe towers 2 are arranged linearly and evenly from top to bottom. The side wall of the straight pipe tower 2 is provided with a welded seam 201, which is spirally distributed. The tapered pipe tower 3 is located at the uppermost end of the straight pipe tower 2, and both ends of the tapered pipe tower 3 and the straight pipe tower 2 are provided with connecting flanges 4.

[0048] This embodiment is designed for complex mountainous terrain and adopts a four-section variable wall thickness straight pipe tower 2. The bottom of the straight pipe tower 2 gradually decreases from 22mm to 18mm, and the top is combined with a section of tapered pipe tower 3. The straight pipe section is equipped with unequal-pitch spiral welded seams 201. The bottom pitch of the spiral welded seam 201 is 350mm and the top pitch is 200mm to adapt to changes in stress distribution. Four sets of lightweight annular reinforcing rings 5 ​​are configured inside. The tapered pipe tower 3 section adopts a 5° taper design with an upper bottom of 3.0m and a lower bottom of 3.5m, with a total height of 6m. All tower sections are connected by PN63 standard connecting flanges 4 and equipped with M36×200 high-strength bolts.

[0049] In terms of materials, the straight pipe uses a composite structure of Q355B steel and 3mm fiberglass, while the tapered pipe uses Q345D steel and undergoes shot peening. The welding process employs laser-arc hybrid welding, with heat input controlled below 18kJ / cm. After optimization, the total weight is reduced by 18% compared to the traditional solution, while still meeting the seismic resistance requirement of 9 degrees.

[0050] Example 4:

[0051] Optionally, this utility model provides another embodiment suitable for fatigue-resistant towers designed for high fatigue load conditions:

[0052] Please see Figure 1 and Figure 2 This utility model provides an embodiment: a spiral steel pipe combined with a straight pipe and a tapered pipe combined tower, including a wind power foundation 1, a straight pipe tower 2, a tapered pipe tower 3, and a connecting flange 4. The straight pipe tower 2 is located at the upper end of the wind power foundation 1, and multiple sets of straight pipe towers 2 are arranged linearly and evenly from top to bottom. The side wall of the straight pipe tower 2 is provided with a welded seam 201, which is spirally distributed. The tapered pipe tower 3 is located at the uppermost end of the straight pipe tower 2, and both ends of the tapered pipe tower 3 and the straight pipe tower 2 are provided with connecting flanges 4.

[0053] Designed for high fatigue load conditions, this embodiment uses a combination of six sections of straight tube tower 2 with equal wall thickness and one section of 5° tapered tube tower 3;

[0054] The straight pipe section adopts a composite structure of spiral welded seam 201 and longitudinal reinforced welded seam 201, with a welded seam 201 spacing of 400mm; the tapered pipe is 6m high and has a wall thickness of 18mm; the connecting flange 4 used for connecting the towers is of PN80 standard and is equipped with M42×220 high-strength bolts.

[0055] The tower casing is made of S355J2H hot-rolled seamless steel pipe. The flanges are heat-treated, and after welding, they undergo stress-relief annealing at 620℃ for 2 hours. 100% ultrasonic testing is also performed. Fatigue testing shows that the structure can withstand 3 million cycles of loading at 1.2 times the rated load, with a dynamic stiffness of 1.8 × 10⁻⁶. 6 kN·m².

[0056] Example 5: Optionally, this utility model provides another embodiment suitable for towers with anti-corrosion systems designed for coastal corrosive environments:

[0057] Please see Figure 1 and Figure 2 This utility model provides an embodiment: a spiral steel pipe combined with a straight pipe and a tapered pipe combined tower, including a wind power foundation 1, a straight pipe tower 2, a tapered pipe tower 3, and a connecting flange 4. The straight pipe tower 2 is located at the upper end of the wind power foundation 1, and multiple sets of straight pipe towers 2 are arranged linearly and evenly from top to bottom. The side wall of the straight pipe tower 2 is provided with a welded seam 201, which is spirally distributed. The tapered pipe tower 3 is located at the uppermost end of the straight pipe tower 2, and both ends of the tapered pipe tower 3 and the straight pipe tower 2 are provided with connecting flanges 4.

[0058] Designed for coastal corrosive environments, this embodiment combines three sections of straight pipe tower 2 with an outer diameter of 4.5m and one section of tapered pipe tower 3 with a 7° outer diameter.

[0059] The straight pipe section is equipped with a 320mm pitch spiral welded seam 201, and is fitted with a 300μm epoxy resin coating and 6 sets of magnesium alloy sacrificial anodes;

[0060] The tapered section is 9m high and 25mm thick. The connecting flange 4 is PN120 standard and is equipped with M52×280 high-strength bolts. The seal uses EPDM rubber gaskets.

[0061] The materials for straight tube tower 2 and tapered tube tower 3 are Q345D high weathering steel, and the flanges are made of S235JR+Ni alloy. The anti-corrosion system has undergone 5 years of marine exposure testing and no red rust has appeared. The insulation resistance remains at 10 ohms. 6 Ω and above.

[0062] Example 6:

[0063] Optionally, this utility model provides another embodiment, which adopts a modular rapid installation tower for temporary or emergency wind power installations:

[0064] Please see Figure 1 and Figure 2This utility model provides an embodiment: a spiral steel pipe combined with a straight pipe and a tapered pipe combined tower, including a wind power foundation 1, a straight pipe tower 2, a tapered pipe tower 3, and a connecting flange 4. The straight pipe tower 2 is located at the upper end of the wind power foundation 1, and multiple sets of straight pipe towers 2 are arranged linearly and evenly from top to bottom. The side wall of the straight pipe tower 2 is provided with a welded seam 201, which is spirally distributed. The tapered pipe tower 3 is located at the uppermost end of the straight pipe tower 2, and both ends of the tapered pipe tower 3 and the straight pipe tower 2 are provided with connecting flanges 4.

[0065] For emergency wind power project development, this embodiment uses a combination of two 18m ultra-long straight pipes and one 10° large tapered pipe. The straight pipe tower section 2 is equipped with a 350mm pitch fully automatic spiral welded seam 201; the tapered pipe tower section 3 is 12m high and has a wall thickness of 28mm.

[0066] The connecting flange 4 adopts prestressed technology, and is equipped with M60×350 high-strength bolts and ultra-high pressure hydraulic pre-tightening device. The material is a composite structure of Q390B steel and 2mm carbon fiber reinforcement layer. The flange is heat treated. On-site installation is achieved with a laser centering system to achieve ±0.5mm precision control. The entire tower can be assembled within 72 hours and supports more than 5 repeated disassembly and assembly.

[0067] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A combined spiral steel pipe and tapered pipe tower, comprising a wind power foundation (1), characterized in that: It also includes a straight pipe tower (2), a tapered pipe tower (3) and a connecting flange (4). The straight pipe tower (2) is located at the upper end of the wind power foundation (1). There are multiple sets of straight pipe towers (2). The multiple sets of straight pipe towers (2) are arranged linearly and evenly from top to bottom. The side wall of the straight pipe tower (2) is provided with a welded seam (201). The welded seam (201) is spirally distributed. The tapered pipe tower (3) is located at the upper end of the uppermost straight pipe tower (2). Both ends of the tapered pipe tower (3) and the straight pipe tower (2) are provided with connecting flanges (4).

2. The spiral steel pipe combined with straight pipe and tapered pipe combination tower according to claim 1, characterized in that: Multiple sets of reinforcing ribs (401) are fixedly installed on one side of the connecting flange (4), and the multiple sets of reinforcing ribs (401) are evenly arranged in a circle around the axis of the connecting flange (4).

3. A spiral steel pipe combined with a straight pipe and a tapered pipe as described in claim 2, characterized in that: Multiple sets of reinforcing ribs (401) and flange holes of connecting flange (4) are arranged in an alternating pattern.

4. A spiral steel pipe combined with a straight pipe and a tapered pipe tower according to claim 1, characterized in that: The straight pipe tower (2) has multiple sets of reinforcing rings (5) fixedly installed inside, and the multiple sets of reinforcing rings (5) are arranged linearly up and down.

5. A spiral steel pipe combined with a straight pipe and a tapered pipe as described in claim 4, characterized in that: The surface of the reinforcing ring (5) has four sets of through holes (501), which are evenly arranged in a circle around the axis of the reinforcing ring (5).

6. A spiral steel pipe combined with a straight pipe and a tapered pipe as described in claim 1, characterized in that: The side wall of the bottom straight pipe tower (2) is provided with an inspection door (6), and a staircase (601) is provided between the inspection door (6) and the wind power foundation (1).

7. A spiral steel pipe combined with a straight pipe and a tapered pipe as described in claim 1, characterized in that: A staircase (601) is provided between the maintenance door (6) and the wind power foundation (1).

8. A spiral steel pipe combined with a straight pipe and a tapered pipe as described in claim 1, characterized in that: Ladders (7) are fixedly installed inside the straight tube tower (2) and the tapered tube tower (3).

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