Butt joint type steel tower

Abstract

The utility model relates to the technical field of steel tower welding, in particular to a butt-joint type steel tower which comprises a tower column, the tower column comprises at least two butt-joint sections, the bottom of each butt-joint section is provided with a first groove and a second groove, the first grooves and the second grooves are arranged at intervals, and the butt-joint sections are arranged at intervals. The first groove is located on the inner side wall of the butt joint section, the second groove is located on the outer side wall of the butt joint section, the first groove, the second groove and the connecting face of the adjacent butt joint section form a K shape, and the fusion depth of the first groove is smaller than that of the second groove. The utility model solves the problems that the penetration qualification rate of the root of a welding seam is difficult to guarantee and the overall appearance forming of the welding seam is poor during butt welding.

Description

Technical Field

[0001] This utility model relates to the technical field of steel tower welding, and more specifically, to a butt-joint steel tower. Background Technology

[0002] For steel towers with irregular spatial structures, the facade lines combine circular and elliptical arcs. The steel towers are generally manufactured in small segments, which are then hoisted onto the site. The segment lines between segments are radially distributed, resulting in various spatial angles at the welds between the segments. Related technologies refer to... Figure 2 As shown, butt welds in steel towers typically involve symmetrical bevels, meaning that butt bevels are created at the top of the lower segment and the bottom of the upper segment, with the same blunt edge and angle for both bevels. However, this bevel design can cause the molten pool to flow downwards under gravity during parallel welding, making it difficult to guarantee the penetration rate at the weld root and resulting in poor overall weld appearance. Utility Model Content

[0003] To address the issues of difficulty in ensuring adequate penetration at the weld root and poor overall weld appearance during butt welding, this invention provides a butt-welded steel tower. The butt-welded steel tower of this invention adopts the following technical solution:

[0004] A butt-joint steel tower, the butt-joint steel tower including a tower column, the tower column including multiple butt joint segments, the multiple butt joint segments being connected in sequence and forming an ellipse;

[0005] In this configuration, the bottom of the upper docking segment among at least two docking segments is provided with a first bevel and a second bevel. The first bevel and the second bevel are spaced apart. The first bevel is located on the inner sidewall of the docking segment, and the second bevel is located on the outer sidewall of the docking segment. The first bevel, the second bevel, and the connecting surfaces of the adjacent docking segments form a K-shape.

[0006] In at least two of the other docking segments, the bottom of the upper docking segment has a third bevel, and the top of the lower docking segment has a fourth bevel, the third bevel and the fourth bevel forming a V-shape.

[0007] Optionally, the third bevel and the fourth bevel are both located above the first bevel and the second bevel.

[0008] Optionally, the depth of the first bevel is less than or greater than the depth of the second bevel.

[0009] Optionally, the angles of the first bevel and the second bevel are both 40°, and the angle of the V-shape formed by the third bevel and the fourth bevel is 40°.

[0010] Optionally, in at least two mating segments, the bottom of the upper mating segment has a blunt edge located between the first bevel and the second bevel, and the at least two mating segments are tightly fitted together by the blunt edge.

[0011] Optionally, the length of the blunt edge is 2 mm.

[0012] Optionally, the V-shaped opening formed by the third bevel and the fourth bevel faces the side of the docking segment away from the centerline of the tower column.

[0013] Optionally, the angle of the third bevel is smaller than the angle of the fourth bevel.

[0014] Optionally, each of the mating segments includes a wall panel and stiffening ribs disposed within the wall panel, the stiffening ribs being welded to the wall panel, and the first bevel, the second bevel, the third bevel, and the fourth bevel being formed at the wall panel of the corresponding mating segment.

[0015] Optionally, the plurality of the docking segments and the first bevel, the second bevel, the third bevel and the fourth bevel are symmetrically distributed about the vertical centerline of the tower column.

[0016] The advantages of this utility model compared to the prior art are:

[0017] This invention is applicable to the butt welding process of multiple sections of a steel tower. The butt welds between the elliptical tower sections utilize either a K-shaped or V-shaped bevel structure. The K-shaped bevel structure includes a first and a second bevel at the bottom of the upper section, while the lower section remains straight. This lower section effectively supports the molten pool, preventing the molten metal from flowing downwards at the weld root, thus ensuring the internal quality of the weld and improving the operability of horizontal butt welding. Furthermore, the V-shaped bevel structure adapts to the spatial angle between the corresponding sections, making the welding process smoother and more efficient. It effectively avoids the complex overhead welding process for the upper section inside the tower, reducing welding time and costs. Simultaneously, the lower section also supports the molten pool, ensuring the internal quality of the weld. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the various connecting segments of the steel tower in the relevant technology;

[0019] Figure 2 This is a schematic diagram of the joint bevel of each connecting segment of the steel tower in the relevant technology;

[0020] Figure 3 This is a schematic diagram of the overall structure of the docking steel tower in this embodiment of the present invention;

[0021] Figure 4 for Figure 3 Enlarged view of region A in the middle;

[0022] Figure 5 for Figure 3 Enlarged view of region B in the middle;

[0023] Figure 6 for Figure 3 Enlarged view of region C in the middle;

[0024] Figure 7 for Figure 3 Enlarged schematic diagram of region D in the middle;

[0025] Figure 8 for Figure 3 Enlarged diagram of region E in the middle;

[0026] Figure 9 for Figure 3 Enlarged schematic diagram of region F in the middle;

[0027] Figure 10 for Figure 3 Enlarged schematic diagram of region G in the middle;

[0028] Figure 11 for Figure 3 Enlarged schematic diagram of region H in the middle;

[0029] Figure 12 This is a schematic diagram of the K-shaped bevel structure before welding in an embodiment of this utility model;

[0030] Figure 13 This is a schematic diagram of the K-shaped bevel structure after welding in an embodiment of this utility model;

[0031] Figure 14 for Figure 3 Enlarged schematic diagram of region I in the middle;

[0032] Figure 15 for Figure 3 Enlarged schematic diagram of region J in the middle;

[0033] Figure 16 for Figure 3 Enlarged diagram of region K in the middle;

[0034] Figure 17 for Figure 3 Enlarged schematic diagram of region L in the middle;

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Tower column; 11. Butt joint segment; 111. First bevel; 112. Second bevel; 113. Blunt edge; 114. Wall panel; 115. Stiffening rib; 116. Third bevel; 117. Fourth bevel; 2. Tower base; 3. First weld layer; 4. Second weld layer. Detailed Implementation

[0037] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0038] In the attached diagram, the Z-axis represents the vertical direction, i.e., up and down, with the positive direction of the Z-axis representing up and the negative direction representing down. The X-axis represents the horizontal direction and is designated as the front and back position, with the positive direction of the X-axis representing the front and the negative direction representing the back. The Y-axis represents the left and right position, with the positive direction of the Y-axis representing the left and the negative direction representing the right. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0040] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0041] In related technologies, steel towers can be assembled using a multi-segment butt-welding process. For example, each butt-welded segment 11 of the steel tower can be a box-type structure, as shown in the reference... Figure 1 As shown, each connecting segment 11 of the steel tower may include a wall panel 114 and stiffening ribs 115. The wall panel 114 is the main load-bearing component and is typically constructed by welding steel plates. To improve the strength and stability of the wall panel 114, stiffening ribs 115 are usually provided. These stiffening ribs can be made of angle steel, channel steel, or I-beams, and their location and number are optimized based on the structural stress conditions. The wall panel 114 and stiffening ribs 115 are connected by welding. When welding adjacent connecting segments 11, a suitable bevel shape is usually designed based on the thickness and material of the wall panel 114. (Refer to...) Figure 2 As shown, the current common form of butt joint bevels is a symmetrical bevel, that is, a butt joint bevel is made at the top of the lower segment and the bottom of the upper segment, and the blunt edges and angles of the upper and lower bevels are the same. However, this bevel design is prone to causing the molten pool to flow downward under the influence of gravity during flat welding, making it difficult to guarantee the penetration rate at the root of the weld, and the overall appearance of the weld is poor.

[0042] To address the problems existing in related technologies, this utility model provides a docking steel tower, referring to... Figure 3 As shown, the butt-joint steel tower includes a tower column 1, which comprises multiple butt joint segments 11. These segments 11 are connected sequentially to form an ellipse. (Refer to...) Figures 4 to 11 As shown, in at least two mating segments 11, the bottom of the upper mating segment 11 has a first bevel 111 and a second bevel 112, which are spaced apart. The first bevel 111 is located on the inner side of the mating segment 11, and the second bevel 112 is located on the outer side of the mating segment 11. The first bevel 111, the second bevel 112, and the connecting surfaces of the adjacent mating segments 11 form a K-shape. In at least two other mating segments 11, the bottom of the upper mating segment 11 has a third bevel 116, and the top of the lower mating segment 11 has a fourth bevel 117. The third bevel 116 and the fourth bevel 117 form a V-shape.

[0043] This utility model is applicable to the butt welding process of multiple butt joint sections 11 of a steel tower, such as... Figure 3As shown, the tower column 1 of the steel tower in this invention is generally elliptical. The butt joint segments 11 of the elliptical tower column 1 are butt welded using a K-shaped bevel structure or a V-shaped bevel structure. The K-shaped bevel structure includes a first bevel 111 and a second bevel 112 at the bottom of the upper butt joint segment 11, while the lower butt joint segment 11 remains straight. Therefore, the lower butt joint segment 11 can support the molten pool, preventing the molten metal in the weld root from flowing downwards, ensuring the internal quality of the weld, and improving the operability of the butt joint segments 11 being butt-welded horizontally. Furthermore, the V-shaped bevel structure is also adapted to the spatial angle between the corresponding butt joint segments 11, making the welding process smoother and more efficient. It effectively avoids the complex process of overhead welding of the upper butt joint segment 11 inside the tower column 1, reducing welding time and cost. Simultaneously, the lower butt joint segment 11 also supports the molten pool, ensuring the internal quality of the weld.

[0044] Optionally, refer to Figure 3 As shown, the third bevel 116 and the fourth bevel 117 are both located above the first bevel 111 and the second bevel 112.

[0045] In this embodiment of the invention, the butt joint segments 11 in the lower and middle regions of the tower column 1 are butt welded using a K-shaped bevel structure, while the butt joint segments 11 in the upper region of the tower column 1 are butt welded using a V-shaped bevel structure formed by a third bevel 116 and a fourth bevel 117, specifically in the transition area between the middle and top butt joint segments 11. This ensures that each butt joint structure is adapted to the spatial angle of its corresponding position.

[0046] Therefore, this invention employs two different bevel structures (K-shaped and V-shaped) for butt welding of the butt joint segments 11 in different areas of the tower column 1, adapting to the height and spatial angle of each butt joint point on the elliptical tower column 1. For the butt joint segments 11 in the lower and middle areas with lower height and larger spatial angles, a K-shaped bevel structure is used for butt welding; for the butt joint segments 11 in the upper area with higher height and smaller spatial angles, a V-shaped bevel structure is used. This improves welding efficiency, controls welding deformation, and meets the welding requirements of different areas while ensuring welding quality.

[0047] Figures 4 to 11 for Figure 1 An enlarged schematic diagram of regions A to H, i.e., a structural schematic diagram of the K-shaped bevel structure. Among them, Figures 4 to 7 For the connection point of the wall panel 114 between every two adjacent mating segments 11 that are away from the center line of the tower column 1, Figures 8 to 11This refers to the connection point of the wall panels 114 near the center line of the tower column 1 between every two adjacent docking segments 11. It should be noted that the inner side of each docking segment 11 refers to the side of the corresponding wall panel 114 closest to the interior of the tower body, and the outer side of each docking segment 11 refers to the side of the wall panel 114 closest to the exterior of the tower body.

[0048] Reference Figures 4 to 5 As shown, in some optional embodiments, at the connection of the butt joint segment 11 of the tower column 1, the melting depth of the first bevel 111 is greater than the melting depth of the second bevel 112.

[0049] Reference Figure 4 and Figure 5 This refers to regions A and B of tower column 1. The connecting segments 11 in this region have a large spatial angle and are tilted outwards. In the K-shaped bevel structure at the connection of the connecting segments 11, the penetration depth of the first bevel 111 on the inner side is greater than that of the second bevel 112, which reduces the amount of molten metal deposited in the second bevel 112 on the outer side. In this way, more molten metal is deposited in the first bevel 111 during welding. This is beneficial for fully utilizing the supporting effect of the connecting segments 11 below according to the spatial angle, and can avoid the tendency of as much molten metal as possible to flow downwards under the action of gravity.

[0050] Reference Figures 6 to 11 As shown, in some optional embodiments, at the connection of the butt joint segment 11 of the tower column 1, the melting depth of the first bevel 111 is less than the melting depth of the second bevel 112.

[0051] Specifically, refer to Figures 6 to 11 In other words, in regions C, D, E, F, G and H of tower column 1, the second bevel 112 located on the outer side of the tower body has a large penetration depth, which facilitates root cleaning and a large amount of welding work; while the first bevel 111 with a small penetration depth is located on the inner side of the butt joint segment 11, which helps to minimize the amount of welding work in the closed environment inside the steel tower, thus facilitating construction.

[0052] Based on the diversity of spatial angles of the connecting segments 11 of the steel tower, this utility model sets the melting depth of the first bevel 111 and the second bevel 112 to be different, which helps to minimize the amount of deposited metal and save material and labor costs.

[0053] Reference Figure 12 As shown, in some optional embodiments, the angle of the first bevel 111 and the angle of the second bevel 112 are both 40°.

[0054] In this invention, symmetrical bevel angles help reduce deformation during welding, resulting in a more uniform distribution of heat input and shrinkage stress on both sides of the weld, thereby reducing the possibility of welding deformation and maintaining good shape and dimensional accuracy of the weldment. Furthermore, identical bevel angles can reduce potential defects during welding, such as porosity and slag inclusions. Because the flow and solidification of the molten pool are more uniform during welding, it facilitates the removal of gases and impurities, improving weld quality. Figure 12 As shown, α refers to the angle of the first bevel 111 and the second bevel 112. In this invention, α is 40°. Compared with the conventional bevel of 50° to 60°, it greatly reduces the amount of deposited metal, the number of weld beads, the amount of heat input and deformation, and ensures the internal quality of the weld.

[0055] Reference Figure 12 As shown, in some optional embodiments, in at least two mating segments 11, the bottom of the upper mating segment 11 has a blunt edge and a blunt edge 113, the blunt edge 113 being located between the first bevel 111 and the second bevel 112, and adjacent mating segments 11 are tightly fitted together by the blunt edge 113. Specifically, Figure 12 In this context, L refers to the length of the blunt edge 113, which is 2mm.

[0056] In this invention, an appropriate blunt edge 113 dimension can reduce the workload of root cleaning and thus lower welding costs. Simultaneously, the blunt edge 113 can absorb some heat, reducing heat concentration and thus minimizing deformation of the weldment during welding, allowing it to maintain good shape and dimensional accuracy.

[0057] Reference Figure 13 As shown, in some optional embodiments, the butt-joint steel tower further includes a first weld layer 3 that is welded to the first bevel 111 and a second weld layer 4 that is welded to the second bevel 112. Figure 13 In this invention, b refers to the weld width and h refers to the weld reinforcement height. If the weld width of the first weld layer 3 and / or the second weld layer 4 is greater than 20mm, then the corresponding weld reinforcement height is ≤3.0mm; if the weld width of the first weld layer 3 and / or the second weld layer 4 is ≤20mm, then the corresponding weld reinforcement height is ≤2.0mm.

[0058] During normal welding, a certain weld reinforcement is required. This reinforcement provides insulation and slows cooling, significantly contributing to grain refinement and reducing welding stress. This invention determines different weld reinforcement heights based on varying weld widths, ensuring welding quality while adapting to diverse welding requirements.

[0059] Figures 14 to 17 for Figure 3 An enlarged schematic diagram of regions I to L, i.e., a structural schematic diagram of the V-shaped bevel structure. Among them, Figure 14 , Figure 15 For the connection point of the wall panel 114 between every two adjacent mating segments 11 that are away from the center line of the tower column 1, Figures 16 to 17 The connection point of the wall panel 114 near the center line of the tower column 1 between every two adjacent docking segments 11.

[0060] Reference Figures 14 to 17 As shown, in some optional embodiments, the angle of the V-shape formed by the third bevel 116 and the fourth bevel 117 is 40°, and the angle of the third bevel 116 is smaller than the angle of the fourth bevel 117. Furthermore, the opening of the V-shape formed by the third bevel 116 and the fourth bevel 117 faces the side of the mating segment 11 away from the centerline of the tower column 1.

[0061] Specifically, such as Figure 14 As shown in the figure, β refers to the angle of the third bevel 116, and θ refers to the angle of the fourth bevel 117. The sum of the angles of the third bevel 116 and the fourth bevel 117 is the angle of the V-shape. This utility model adopts an asymmetrical bevel structure, that is, the angle of the upper third bevel 116 is smaller than the angle of the lower fourth bevel 117. This is beneficial to make the cross-sectional shape of the weld asymmetrical during the welding process. This design can reduce welding stress, thereby reducing welding deformation. In addition, since the opening of the V-shaped bevel faces the side of the butt joint segment 11 away from the center line of the tower column 1, it facilitates construction.

[0062] In some alternative embodiments, each mating segment 11 includes a wall panel 114 and a stiffening rib 115 disposed within the wall panel 114, the stiffening rib 115 being welded to the wall panel 114, and a first bevel 111 and a second bevel 112 being formed at the wall panel 114 of the mating segment 11.

[0063] Specifically, refer to Figure 3 As shown, the steel tower also includes a tower base 2, which is specifically made of concrete. Two butt joint segments 11 at the ends of the tower column 1 are connected to the tower base 2. (Refer to...) Figures 4 to 11 As shown, the first bevel 111, the second bevel 112, the third bevel 116, and the fourth bevel 117 are all formed at the wall panel 114 of the connecting segment 11. Each first bevel 111 is located on the side of the wall panel 114 closer to the interior of the tower body, and each second bevel 112 is located on the side of the wall panel 114 closer to the exterior of the tower body. The multiple connecting segments 11 and the first bevels 111, second bevel 112, third bevel 116, and fourth bevel 117 are symmetrically distributed about the vertical centerline of the tower column 1.

[0064] Due to the shape characteristics of the steel tower, the welds between different butt joint sections 11 have different angles. The penetration depth of the first bevel 111, second bevel 112, third bevel 116, and fourth bevel 117 of each butt joint section 11 is adaptively set according to their respective spatial angles. Furthermore, the butt joint sections 11 of the tower column 1 are symmetrically distributed about the vertical centerline of the tower column 1. This is conducive to a relatively balanced heat input and shrinkage on both sides of the steel tower, which can reduce the deflection deformation caused by weld shrinkage and make the stress distribution of the steel tower more uniform.

[0065] Taking the K-shaped bevel structure as an example, the welding method for two butt joint segments 11 in this utility model may specifically include the following steps:

[0066] Step S1: A first bevel 111 is formed on the inner bottom side of the upper butt joint segment 11, and a second bevel 112 is formed on the outer bottom side wall. The angles of both the first bevel 111 and the second bevel 112 are 40°. The penetration depth of the first bevel 111 is less than that of the second bevel 112. A 2mm blunt edge 113 is maintained between the first bevel 111 and the second bevel 112. When the thickness of the wall panel 114 is less than or equal to 32mm, a flame dehumidification method is used for pre-welding treatment to remove moisture and humidity from the surface of the wall panel 114. When the thickness of the wall panel 114 is greater than 32mm but less than 50mm, the wall panel 114 needs to be preheated to between 80°C and 120°C.

[0067] Step S2: After connecting the two adjacent butt joint segments 11 in step S1, fix the butt joint segments 11 by tack welding. Select J507Q or ER55-G tack welding wire. When the thickness of the wall plate 114 is less than or equal to 32mm, the interpass temperature is set to 5℃ to 200℃; when the thickness of the wall plate 114 is greater than 32mm and less than 50mm, the interpass temperature is set to 80℃ to 200℃.

[0068] Step S3: After tack welding, first use CO2 gas shielded welding to perform root pass welding on the second bevel 112 located on the outer wall, using ER55-G welding wire. Specifically, first weld a root pass at the center of the bottom of the bevel, controlling the welding current to 225A to 235A and the welding voltage to 26V to 27V. Then, use the current to completely melt the root pass and the blunt edge 113 to ensure full penetration, forming the second weld layer 4 on the root pass.

[0069] Step S4: After completing the welding of the second bevel 112, before starting the welding of the first bevel 111, the root of the first bevel 111 is cleaned to remove defects and impurities at the root of the weld, ensuring the quality and penetration of the weld. Then, the first bevel 111 is welded using the same welding process as the second weld layer 4 to form the first weld layer 3.

[0070] By first welding the second bevel 112 with a larger penetration depth and then welding the first bevel 111 with a smaller penetration depth, it is beneficial to ensure that the root of the weld is fully fused, avoid defects such as incomplete penetration and incomplete fusion, improve the overall quality of the weld, make the weld metal denser, and reduce the generation of welding defects such as porosity and slag inclusions; it can also reduce the number of subsequent welding layers and increase the welding speed.

[0071] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A butt-jointed steel tower, characterized in that, The butt joint steel tower comprises a tower column (1), the tower column (1) comprises a plurality of butt joint segments (11), and the plurality of butt joint segments (11) are sequentially connected and surround an ellipse; The bottom of the butt joint segment (11) located upwards among at least two butt joint segments (11) is provided with a first groove (111) and a second groove (112), the first groove (111) and the second groove (112) are arranged at intervals, the first groove (111) is located at the inner side wall of the butt joint segment (11), the second groove (112) is located at the outer side wall of the butt joint segment (11), and the first groove (111), the second groove (112) and the connecting surface of the adjacent butt joint segment (11) form a K shape. The bottom of the butt joint segment (11) located upwards among at least two butt joint segments (11) is provided with a third groove (116), and the top of the butt joint segment (11) located downwards is provided with a fourth groove (117), the third groove (116) and the fourth groove (117) surround a V shape.

2. The butt-jointed steel tower of claim 1, wherein The third groove (116) and the fourth groove (117) are located on the upper side of the first groove (111) and the second groove (112).

3. The butt-jointed steel tower of claim 1, wherein The penetration depth of the first groove (111) is smaller or larger than the penetration depth of the second groove (112).

4. The butt-jointed steel tower of claim 1, wherein The angle of the first groove (111) and the angle of the second groove (112) are 40° respectively, and the angle of the V shape surrounded by the third groove (116) and the fourth groove (117) is 40° respectively.

5. The butt-jointed steel tower of claim 1, wherein The bottom of the butt joint segment (11) located upwards among at least two butt joint segments (11) has a blunt edge (113), the blunt edge (113) is located between the first groove (111) and the second groove (112), and at least two butt joint segments (11) are tightly fitted through the blunt edge (113).

6. The butt-jointed steel tower of claim 5, wherein The length of the blunt edge (113) is 2mm.

7. The butt-jointed steel tower of claim 1, wherein The opening of the V shape surrounded by the third groove (116) and the fourth groove (117) faces the side of the butt joint segment (11) away from the center line of the tower column (1).

8. The butt-jointed steel tower of claim 1, wherein The angle of the third groove (116) is smaller than the angle of the fourth groove (117).

9. The docking steel tower of claim 1, wherein, Each butt joint segment (11) comprises a wall plate (114) and a stiffening rib (115) arranged in the wall plate (114), the stiffening rib (115) and the wall plate (114) are mutually welded, and the first groove (111), the second groove (112), the third groove (116) and the fourth groove (117) are arranged at the wall plate (114) of the corresponding butt joint segment (11).

10. The butt-jointed steel tower of claim 9, wherein The plurality of butt joint segments (11) and the first groove (111), the second groove (112), the third groove (116) and the fourth groove (117) are symmetrically distributed about the vertical center line of the tower column (1).

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