Large-span steel tube tower structure of power transmission line

Abstract

The invention relates to the technical field of power line steel tube towers, in particular to a power transmission line large-span steel tube tower structure. Comprising a plurality of main supporting pipes, and butt joint assemblies are arranged in the other main supporting pipes except the main supporting pipe on the uppermost side; the butt joint assembly comprises a middle connecting piece, the middle connecting piece is arranged on the upper portion in the main supporting pipe, a butt joint part is arranged on the upper portion of the middle connecting piece, and the butt joint part extends out of the main supporting pipe. According to the butt joint device, the butt joint part is used for limiting the main supporting pipe at the butt joint position, butt joint of the two main supporting pipes can be achieved through fine adjustment of an operator, in this way, the influence of cooperation of high-altitude operation personnel and a tower crane operator on the butt joint operation efficiency is reduced, the butt joint operation efficiency is improved, actions of the high-altitude operation personnel are reduced, and the labor intensity of workers is reduced. And meanwhile, the operator does not need to guide the two main supporting pipes to roughly position, and the risk that the operator is extruded to be injured is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steel tube towers for power lines, and in particular to a large-span steel tube tower structure for power transmission lines. Background Art

[0002] The steel pipe tower is a tower-shaped support structure constructed mainly of steel pipes. It is widely used in fields such as power transmission and wind power generation that require large-span wiring. Its standard structure includes three core parts: the cross arm (horizontal support frame) for laying cables at the top, the load-bearing tower body in the middle, and the basic support system at the bottom. The tower body is usually composed of four large-diameter main steel pipes arranged at an outward angle of 5°-15°, and effective load dispersion is achieved through scientific angle design.

[0003] In construction practice, the main steel pipes need to be prefabricated in sections and assembled on site due to factors such as transportation conditions, manufacturing processes, maintenance requirements, and load limitations of lifting equipment. The current process uses a tower crane to lift the pipe section to the high-altitude docking position, and then the high-altitude workers manually guide the pipe section for docking. This operation method has significant defects: first, the high-altitude workers and tower crane operators need to be highly coordinated, which makes the docking time-consuming and inefficient. Secondly, when the workers are exposed to an altitude of more than 20 meters and manually guide the pipe sections to dock, there is a risk of being squeezed out of balance and falling by the reaction force of the pipe section, and there is also the hidden danger of being squeezed and injured by the pipe section weighing several tons. Thirdly, the spatial positioning deviation caused by the inclination angle of the pipe section makes the docking operation of the traditional process time-consuming, inefficient, and has a high safety accident rate. Summary of the invention

[0004] The invention provides a large-span steel tube tower structure for a power transmission line, so as to overcome the shortcomings of the existing steel tube towers in the assembly process, such as long docking time, low efficiency and high safety accident rate.

[0005] The technical solution of the present invention is: a large-span steel pipe tower structure for a power transmission line, comprising: A plurality of main support tubes, each of which is fixedly connected with a connecting flange at both ends, each of which is divided into four groups and connected end to end through the connecting flanges to form four main poles of the steel pipe tower, the four main poles are centrally symmetrically distributed, and the distance between two adjacent main poles gradually decreases from bottom to top, a plurality of diagonal support tubes are commonly fixedly connected between two adjacent main poles, and a cross arm is commonly fixedly connected to the four main poles, and a docking assembly for improving docking efficiency and safety is arranged in each of the main support tubes except the uppermost main support tube; The docking component includes: a middle connector, which is arranged at the upper part inside the main support pipe. A docking part is arranged at the upper part of the middle connector, and the docking part extends out of the main support pipe. In the upward direction, the cross-sectional area of the docking part gradually decreases when intercepted by a plane perpendicular to the central axis of the main support pipe, facilitating insertion into the adjacent main support pipe.

[0006] Furthermore, the docking part is provided with a guiding arc surface. The planar shape of the docking part intercepted by a vertical plane passing through both the central axis of the main support pipe and the symmetric center of the four main rods is a right trapezoid, and the right-angled side of this cross-section is located on the side of the docking part away from the symmetric center of the four main rods. The upper and lower edges of the guiding arc surface are both circular, and their diameters are equal to the inner diameter of the main support pipe.

[0007] Furthermore, a docking groove, a guiding groove, and a positioning groove are arranged on the side of the docking part away from the symmetric center of the four main rods. In the downward direction, the docking groove, the guiding groove, and the positioning groove are sequentially connected, and the width of the guiding groove gradually decreases. A positioning post is fixedly connected to the lower part on the side of the remaining main support pipes away from the symmetric center of the four main rods except for the lowermost main support pipe. The minimum width of the guiding groove is equal to the width of the positioning groove and is equal to the diameter of the positioning post.

[0008] Furthermore, the middle connector slides at the upper part inside the main support pipe. A rubber cylinder is arranged between the middle connector and the main support pipe. When the adjacent two main support pipes are not docked, there is a distance between the docking part and the upper end face of the main support pipe, so that the adjacent two main support pipes do not contact during the docking process.

[0009] Furthermore, a limiting groove is arranged on the side of the docking part away from the symmetric center of the four main rods. The limiting groove is connected to the adjacent positioning groove, and the depth of the limiting groove is greater than the depth of the positioning groove, for limiting the adjacent positioning post.

[0010] Furthermore, supports are fixedly connected to the upper parts of the remaining main support pipes except for the uppermost main support pipe. A force-applying worm and a threaded worm gear are rotatably connected to the supports. The main support pipe is provided with a hole for the force-applying worm to pass through. The force-applying worm is rotationally and sealingly connected to the main support pipe. The force-applying worm meshes with the threaded worm gear. An installation hole is arranged inside the middle connector. A pre-tightening sliding column is spline-connected in the installation hole. The pre-tightening sliding column is threadedly connected to the threaded worm gear. The central axis of the pre-tightening sliding column is parallel to but does not intersect with the central axis of the adjacent main support pipe.

[0011] Furthermore, the hole on the main support pipe for the force-applying worm to pass through is located on the side of the main support pipe close to the symmetric center of the four main rods.

[0012] Further, a plurality of limiting blocks are slidably connected inside the middle connecting piece. The pre-tightening sliding column is provided with an extrusion surface for extruding the limiting blocks to move, and the limiting blocks are used to support the connection part between two adjacent main support pipes.

[0013] Further, the depth of the limiting groove is not less than the generatrix length of the positioning column. The upper side surface of the limiting groove is perpendicular to the central axis of the adjacent main support pipe, and the lower side surface of the limiting groove is parallel to the horizontal plane.

[0014] Further, a plurality of friction grooves are provided on one side of the limiting block away from the adjacent pre-tightening sliding column, and the friction grooves are used to increase the friction force between the limiting block and the main support pipe.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention uses the docking part to limit the main support pipe in the docking position, and through the fine adjustment of the operator, the docking of two sections of the main support pipe can be realized. In this way, not only the influence of the cooperation between the high-altitude operators and the tower crane operator on the docking operation efficiency is reduced, the docking operation efficiency is improved, but also the actions of the high-altitude operators are reduced, the risk of the operators falling is reduced. At the same time, there is no need for the operator to guide the rough positioning of the two sections of the main support pipe, and the risk of the operator being crushed and injured is reduced.

[0016] The positioning column is limited by the limiting groove, so that during the period when the docking of the two sections of the main support pipe is completed but not fixed, a pulling force is provided for the back surface in the tilting direction of the main support pipe, and the contact between the guiding arc surface and the main support pipe provides support for the front surface in the tilting direction of the main support pipe, thereby reducing the probability of the main support pipe tipping over and protecting the construction safety of the operators.

[0017] After the docking of the two sections of the main support pipe is completed, the middle connecting piece is extruded to move by relying on the pre-tightening sliding column, and a downward traction force is provided for the back surface in the tilting direction of the main support pipe through the limiting groove and the positioning column, thereby dispersing the load of the bolts on the connecting flange, prolonging the service life of the bolts on the connecting flange, and maintaining the stability of the fixation between two adjacent sections of the main support pipe.

[0018] The inner side surface of the connection part between the two sections of the main support pipe is supported by the limiting block, and the misalignment shear force caused by factors such as vibration between the two sections of the main support pipe is shared, thereby protecting the bolts connecting the two sections of the main support pipe, prolonging the service life of the bolts, and improving the stability of the connection part between the two sections of the main support pipe at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a three-dimensional structural schematic diagram of the main support pipe and the connecting flange of the present invention; Figure 3 Schematic three-dimensional structure diagram of the connecting part and the support in the present invention; Figure 4 Schematic three-dimensional structure diagram of the force-applying worm and the pre-tightening sliding column in the present invention; Figure 5 Schematic three-dimensional structure diagram of the connecting part and the limiting block before docking in the present invention; Figure 6 Schematic cross-sectional view of the three-dimensional structure of the main support pipe and the connecting part before docking in the present invention; Figure 7 Schematic three-dimensional structure diagram of the connecting part and the guiding arc surface in the present invention; Figure 8 Schematic three-dimensional structure diagram of the pre-tightening sliding column and the limiting block in the present invention; Figure 9 Schematic cross-sectional view of the three-dimensional structure of the connecting part and the positioning column during the docking process of the present invention; Figure 10 Schematic cross-sectional view of the three-dimensional structure of the main support pipe and the positioning column during the docking process of the present invention.

[0020] In the attached drawings: 100 - main rod, 200 - cross arm, 1 - main support pipe, 2 - connecting flange, 3 - diagonal support pipe, 4 - connecting part, 401 - docking part, 5 - positioning column, 501 - docking groove, 502 - guiding groove, 503 - positioning groove, 6 - guiding arc surface, 7 - limiting groove, 8 - support, 9 - force-applying worm, 901 - threaded worm gear, 10 - pre-tightening sliding column, 101 - mounting hole, 11 - limiting block, 111 - extrusion surface, 12 - friction groove. Detailed implementation manner

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] Examples of the embodiments are shown in the attached drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the attached drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention. Embodiment 1

[0023] This embodiment provides a large-span steel pipe tower structure for transmission lines to shorten the docking operation time, improve the docking operation efficiency, and reduce the safety accident rate.

[0024] See Figures 1 - 3, The large-span steel pipe tower structure of the transmission line includes: several main support pipes 1. A ladder for operators to climb is arranged on the side of the main support pipe 1. A foothold for operators to stand temporarily is arranged on the upper part of the circumference of the main support pipe 1. Connecting flanges 2 are fixedly connected to both the upper and lower ends of the main support pipe 1. Reinforcing ribs are arranged between the connecting flange 2 and the adjacent main support pipe 1. The several main support pipes 1 are divided into four groups and are connected end to end through the connecting flanges 2 to form the four main poles 100 of the steel pipe tower. The number of main support pipes 1 is determined according to the height of the main pole 100, and no excessive limitation is made here; the four main poles 100 are symmetrically distributed around the center. In the upward direction, the distance between two adjacent main poles 100 gradually decreases, making the main pole 100 inclined relative to the horizontal plane; several diagonal support pipes 3 for connecting two adjacent main poles 100 are fixedly connected between two adjacent main poles 100 (the diagonal support pipe 3 in the attached drawing is only for illustration, and the specific structure of the diagonal support pipe 3 is not shown in detail). A flange for bolt connection with the diagonal support pipe 3 is arranged on the circumference of the main support pipe 1. A cross arm 200 is fixedly connected to the upper sides of the four main poles 100. The bottom foundation support system, the four main poles 100, the cross arm 200, and several diagonal support pipes 3 together form the steel pipe tower. The foundation support system is an existing structure and is not shown in detail in the attached drawing; A docking component for improving the docking efficiency and safety is arranged in the main support pipe 1 except for the uppermost main support pipe 1.

[0025] See Figures 2 - 4 , The docking component includes: a middle connection piece 4. The middle connection piece 4 is arranged in the upper part of the main support pipe 1. A docking part 401 is arranged on the upper part of the middle connection piece 4. The docking part 401 extends out of the upper end face of the main support pipe 1, and the height that the docking part 401 extends out of the main support pipe 1 is greater than the maximum gap between the opposite sides of the two connecting flanges 2 when the connecting flange 2 on the vertically placed main support pipe 1 (referring to the main support pipe 1 during hoisting) contacts the connecting flange 2 on the inclined main support pipe 1 (referring to the main support pipe 1 on the already installed main pole 100), ensuring that the docking part 401 can extend into the adjacent main support pipe 1 above it before the two main support pipes 1 contact; In the upward direction of the docking part 401, the cross-sectional area of it intercepted by a plane perpendicular to the central axis of the main support pipe 1 gradually decreases.

[0026] It should be noted that in this embodiment, the relationship between the middle connection piece 4 and the main support pipe 1 can be regarded as fixedly connected, and the lower edge of the docking part 401 coincides with the upper edge of the inner side of the main support pipe 1.

[0027] The above settings can achieve the following: the main support pipe 1 is restricted at the docking position by the docking part 401, and through the fine-tuning of the operator, the docking of two sections of the main support pipe 1 can be achieved. In this way, not only the influence of the cooperation between the high-altitude operators and the tower crane operator on the docking operation efficiency is reduced, the docking operation efficiency is improved, but also the actions of the high-altitude operators are reduced, the risk of the operators falling is reduced. At the same time, there is no need for the operators to guide the two sections of the main support pipe 1 for rough positioning, reducing the risk of the operators being crushed and injured.

[0028] The working principle after using the above settings is as follows: when assembling the steel pipe tower, the operator first completes the casting of the bottom foundation support system, and uses bolts to connect the four main support pipes 1 to the four corners of the foundation support system respectively to form four main poles 100. Subsequently, two cross-distributed diagonal support pipes 3 are connected between adjacent two main poles 100 by bolts. Then, the main support pipe 1 is successively hoisted by a hoisting device and moved towards the docking position (in this article, the docking position refers to the connecting flange 2 at the upper part of the main support pipe 1 that has been fixed). Before the hoisting starts, the lifting rope is adjusted to ensure that the central axis of the main support pipe 1 is always in the vertical state during the hoisting, and the flange orientation of the main support pipe 1 connected to the diagonal support pipe 3 on the circumferential side is approximately correct. During this process, the tower crane operator controls the main support pipe 1 to move slowly. When the main support pipe 1 moves above the docking position, the tower crane operator controls the main support pipe 1 to move down slowly, so that the docking part 401 enters the main support pipe 1. As the main support pipe 1 moves down, finally the connecting flange 2 at the lower part of the main support pipe 1 is located on the upper side of the connecting flange 2 below it. At this time, the docking part 401 completely enters the main support pipe 1, and the rough docking of the main support pipe 1 is realized. In this way, there is no need for the operator to manually guide the movement of the main support pipe 1, reducing the probability of the operator being injured by the main support pipe 1.

[0029] After the rough docking of the main support pipe 1 is achieved, the operator moves through the ladder and stands at the foot point below the docking position, and manually guides the flange of the main support pipe 1 connected to the diagonal support pipe 3 towards the preset direction, and sequentially passes multiple bolts through the two connecting flanges 2 at the docking position. Subsequently, the operator uses tools to tighten the bolts to complete the assembly of the main support pipe 1; the operator repeats the above steps, and sequentially assembles the main support pipe 1 on the other three main poles 100 at the same height, and then installs the diagonal support pipe 3. Sequentially repeat the above steps until the height of the main pole 100 reaches the preset height, and then install the cross arm 200 by hoisting, thus completing the assembly of the steel pipe tower. Embodiment 2

[0030] This embodiment provides a large-span steel pipe tower structure for transmission lines, which further assists the docking operation on the basis of Embodiment 1.

[0031] This embodiment takes the Figure 2 front view perspective as an example for illustration. Figure 2The main rod 100 therein inclines downward from top to bottom and to the right.

[0032] See Figure 7 , a guiding arc surface 6 is arranged on the peripheral side of the docking part 401. The planar shape of the docking part 401 intercepted by a vertical plane passing through the central axis of the main support pipe 1 and the symmetry center of the four main rods 100 is a right trapezoid, and the right-angle side of this section is located on the side of the docking part 401 away from the symmetry center of the four main rods 100. The upper and lower edges of the guiding arc surface 6 are both circular, and the diameter of the lower edge of the guiding arc surface 6 is equal to the inner diameter of the main support pipe 1.

[0033] The above settings can achieve the following: use the right part of the guiding arc surface 6 to limit the right side of the lower edge in the main support pipe 1, restrict the swing point when the main support pipe 1 swings, and use the left part of the guiding arc surface 6 to guide the swing of the main support pipe 1, reducing the probability that the main support pipe 1 is overly inclined during the coaxial process of docking and swinging (that is, the upper end of the upper main support pipe 1 inclines to the left of the extension line of the central axis of the main rod 100).

[0034] See Figures 4 - 7 , a docking groove 501, a guiding groove 502, and a positioning groove 503 are arranged on the side of the docking part 401 away from the symmetry center of the four main rods 100. The upper and lower parts of the guiding groove 502 are respectively communicated with the docking groove 501 and the positioning groove 503. In the vertical direction from top to bottom, the width of the guiding groove 502 gradually decreases. A positioning post 5 is fixedly connected to the lower part of the side of the other main support pipes 1 except the lowermost main support pipe 1 away from the symmetry center of the four main rods 100. An arc-shaped ring surface is arranged on the edge of the positioning post 5 close to the central axis of the main support pipe 1, which facilitates the positioning post 5 to enter the docking groove 501, the guiding groove 502, and the positioning groove 503; the minimum width of the guiding groove 502 is equal to the width of the positioning groove 503 and is equal to the diameter of the positioning post 5; the connecting line of the midpoints of the docking groove 501, the guiding groove 502, and the positioning groove 503 is parallel to the central axis of the main support pipe 1 and is located on the side of the central axis of the main support pipe 1 away from the symmetry center of the four main rods 100.

[0035] It should be noted that in this embodiment, the generatrix length of the positioning post 5 is not greater than the depth of the positioning groove 503.

[0036] The above settings can achieve the following: by using the positioning post 5 to guide the main support pipe 1, during the process of the main support pipe 1 completing a rough docking and approaching the docking position, the angle of the main support pipe 1 is gradually guided and changed by the guiding groove 502, and finally when the positioning post 5 enters the positioning groove 503, the angle of the main support pipe 1 reaches the preset angle. In this way, the workload of the high-altitude operators is reduced, and the probability of the operators falling is decreased; by arranging the docking groove 501, the guiding groove 502 and the positioning groove 503 on the right side of the docking part 401, during the hoisting and downward movement of the main support pipe 1, the positioning post 5 inside the main support pipe 1 can quickly enter the docking groove 501, the guiding groove 502 and the positioning groove 503, facilitating the correct docking of the two sections of the main support pipe 1.

[0037] See Figure 2 and Figure 6 , the middle connecting piece 4 slides on the upper part inside the main support pipe 1. A rubber cylinder is arranged between the middle connecting piece 4 and the main support pipe 1. The above rubber cylinder is sleeved on the outer periphery of the middle connecting piece 4, and initially the rubber cylinder between the middle connecting piece 4 and the main support pipe 1 is in a compressed and energy-storing state, so that there is a frictional force between the main support pipe 1 and the middle connecting piece 4. When the two adjacent main support pipes 1 are not docked, there is a distance between the docking part 401 and the upper end face of the main support pipe 1, so that the two adjacent main support pipes 1 do not contact during the docking process.

[0038] The above settings can be realized. By using the distance between the docking part 401 and the upper end face of the adjacent main support pipe 1, the positioning groove 503 can provide a supporting force for the positioning post 5 and the main support pipe 1, so that during the docking process, the two connecting flanges 2 do not contact, reducing the probability of the anti-corrosion coating being damaged due to the point contact of the two connecting flanges 2.

[0039] The working principle of the above settings is as follows: during the docking operation, after the tower crane operator moves the main support pipe 1 above the docking position, the lifting rope is slowly released to make the main support pipe 1 move down slowly. And during the process that the main support pipe 1 slowly sleeves on the docking part 401, the tower crane operator observes the state of the main support pipe 1. If the lower part of the main support pipe 1 tilts to the left, it means that the main support pipe 1 contacts the guiding arc surface 6 and slides along it. At this time, while controlling the main support pipe 1 to move horizontally to the left, the tower crane operator releases the main support pipe 1, so that the main support pipe 1 generally remains in a vertical state during the downward movement.

[0040] During the downward movement of the main support pipe 1, since the docking groove 501, the guiding groove 502, and the positioning groove 503 are in a state of tilting from top to bottom and leftward as a whole, the main support pipe 1 drives the positioning column 5 to sequentially enter the docking groove 501, the guiding groove 502, and the positioning groove 503. When the positioning column 5 slides along the guiding groove 502, the positioning column 5 is guided by the guiding groove 502 and drives the main support pipe 1 to rotate, making the flange on the main support pipe 1 connected to the diagonal support pipe 3 more accurately oriented. Until when the positioning column 5 moves into the positioning groove 503, the flange on the main support pipe 1 connected to the diagonal support pipe 3 reaches the preset angle. At this time, the lower side surface of the positioning groove 503 contacts the positioning column 5 and provides a supporting force to the positioning column 5, so that the two connecting flanges 2 do not contact (reference can be made to Figure 9 the state of the two connecting flanges 2 in

[0041] After the positioning column 5 moves to the end of the positioning groove 503, as the lifting rope connecting the main support pipe 1 continues to be released, the right side of the lower part of the main support pipe 1 is supported by the positioning column 5 and cannot move downward. At this time, the main support pipe 1 starts to swing leftward with the position where the positioning column 5 contacts the positioning groove 503 as the swing center. Finally, when the tower crane operator observes that the inclination angle of the main support pipe 1 is close to the inclination angle of the adjacent main rod 100, the release of the lifting rope is stopped; during the process of the upper part of the main support pipe 1 swinging leftward, the inner lower edge of the main support pipe 1 contacts and slides along the guiding arc surface 6. When the inclination angle of the main support pipe 1 is close to the inclination angle of the adjacent main rod 100, the main support pipe 1 swings to contact the lower edge of the guiding arc surface 6. At this time, the central axes of the two connecting flanges 2 are approximately coincident. Subsequently, the operator sequentially inserts several bolts into the bolt holes of the two connecting flanges 2 and uses tools to tighten the bolts. During the process of tightening the bolts, the tower crane operator continuously releases the lifting rope. The two connecting flanges 2 approach each other under the action of the bolts, and the upper connecting flange 2 drives the main support pipe 1 and the positioning column 5 to move downward together. The positioning column 5 squeezes the middle connector 4 to move downward, so that the middle connector 4 and the rubber cylinder on it move downward relative to the lower main support pipe 1. Until when the two main support pipes 1 are fitted, the lower side edge of the docking part 401 coincides with the inner upper side edge of the lower main support pipe 1, and thus the single docking operation is completed. Embodiment 3

[0042] This embodiment provides a large-span steel pipe tower structure for transmission lines, which improves the safety of the docking operation on the basis of Embodiment 2.

[0043] See Figure 4 and Figures 6 - 10 , a limiting groove 7 is provided on one side of the docking part 401 away from the symmetry center of the four main rods 100. The width of the limiting groove 7 is equal to the width of the positioning groove 503. The limiting groove 7 is communicated with the adjacent positioning groove 503, and the depth of the limiting groove 7 is greater than the depth of the positioning groove 503, which is used to limit the adjacent positioning column 5.

[0044] It should be noted that in this embodiment, the generatrix length of the positioning column 5 is greater than the depth of the positioning groove 503 and less than the depth of the limiting groove 7.

[0045] The above settings can achieve the following: the limiting groove 7 is used to limit the positioning column 5, so that during the period when the two main support pipes 1 are butted but not fixed, a pulling force is provided for the back surface in the tilting direction of the main support pipe 1, and the contact between the guiding arc surface 6 and the main support pipe 1 provides support for the front surface in the tilting direction of the main support pipe 1, thereby reducing the probability of excessive tilting of the main support pipe 1 and protecting the construction safety of the operators.

[0046] During the process of the main support pipe 1 driving the positioning column 5 to move vertically downward, the positioning column 5 slides along the docking groove 501, the guiding groove 502 and the positioning groove 503 in sequence, and enters the limiting groove 7 after moving out of the positioning groove 503 and contacts the lower side surface of the limiting groove 7. At this time, the positioning column 5 is supported by the lower side surface of the limiting groove 7 and stops moving downward (the state of the limiting groove 7 shown in Figure 9 can be referred to). As the upper part of the main support pipe 1 swings to the left, the inner lower edge of the main support pipe 1 slides along the guiding arc surface 6, and the guiding arc surface 6 guides the lower part of the main support pipe 1 to move to the left, so that the main support pipe 1 drives the positioning column 5 to enter the limiting groove 7. Finally, the lower side inside the main support pipe 1 coincides with the edge of the lower side of the docking part 401 (the state shown in Figure 10 can be referred to). In this way, the limiting of the positioning column 5 by the limiting groove 7 reduces the probability of the main support pipe 1 tipping over before being fixed by bolts. Embodiment 4

[0047] This embodiment provides a large-span steel pipe tower structure for transmission lines, and on the basis of Embodiment 3, it provides the function of sharing the load at the connection of the two main support pipes 1.

[0048] Refer to Figures 3 - 10 , a support 8 is fixedly connected to the upper part inside the remaining main support pipes 1 except the uppermost main support pipe 1. The support 8 is rotatably connected with a driving worm 9 and a threaded worm gear 901. A hole for the driving worm 9 to pass through is provided in the upper part of the main support pipe 1. The driving worm 9 passes through the hole of the main support pipe 1 and is rotatably connected with it in a sealed manner. The driving worm 9 and the threaded worm gear 901 together form a worm and worm gear structure. An installation hole 101 is provided in the middle connecting piece 4. A pre-tightening sliding column 10 is spline-connected in the installation hole 101. The pre-tightening sliding column 10 is coaxially and threadedly connected with the adjacent threaded worm gear 901. The central axis of the pre-tightening sliding column 10 is parallel to but does not intersect with the central axis of the adjacent main support pipe 1, so as to limit the rotation of the middle connecting piece 4 and keep the relative angle between the middle connecting piece 4 and the main support pipe 1 unchanged; the hole on the main support pipe 1 is located on its left side. By using the characteristic that the left side of the main support pipe 1 bears pressure under its own weight and using the driving worm 9 to provide a supporting force for the hole on the main support pipe 1, the overall structural strength of the main support pipe 1 is kept unchanged.

[0049] The above settings can achieve that after the docking of the two main support pipes 1 is completed, the pre-tightening sliding column 10 is relied on to squeeze the middle connecting piece 4 to move, and the limiting groove 7 and the positioning column 5 provide a downward traction force on the back surface of the main support pipe 1 in the inclined direction, thereby dispersing the load of the bolts on the connecting flange 2, extending the service life of the bolts on the connecting flange 2, and maintaining the fixed stability between two adjacent main support pipes 1.

[0050] After the docking of two adjacent main support pipes 1 is completed, the operator connects a tool to the force-applying worm 9, and then rotates the force-applying worm 9 to drive the threaded worm gear 901 to rotate. The threaded worm gear 901 drives the pre-tightening sliding column 10 to move downward through the thread. The pre-tightening sliding column 10 first moves downward relative to the middle connecting piece 4, and then the pre-tightening sliding column 10 squeezes the middle connecting piece 4 to move downward. The middle connecting piece 4 applies a downward squeezing force to the positioning column 5 through the limiting groove 7, thereby dispersing the load borne by the bolts on the back surface of the main support pipe 1 in the inclined direction and extending the service life of the bolts. Embodiment 5

[0051] This embodiment provides a large-span steel pipe tower structure for a transmission line, and on the basis of Embodiment 4, it provides the function of providing internal support for the connection part of the two main support pipes 1.

[0052] See Figure 3 , Figure 5 , Figure 7 and Figure 8 , four limiting blocks 11 are slidably connected inside the middle connecting piece 4. The sizes of the four limiting blocks 11 are all different, and the four limiting blocks 11 are circumferentially distributed around the central axis of the pre-tightening sliding column 10. Initially, the limiting blocks 11 do not protrude from the adjacent docking part 401. The pre-tightening sliding column 10 is provided with a pressing surface 111, and the inner diameter of the pressing surface 111 gradually decreases in the direction from top to bottom along the central axis of the main support pipe 1. Before the two main support pipes 1 are docked, the four limiting blocks 11 are all in contact with the pressing surface 111. The pressing surface 111 is used to squeeze the limiting blocks 11 to move, and the limiting blocks 11 are used to support the connection part of two adjacent main support pipes 1.

[0053] The above settings can achieve that the inner side surfaces of the connection parts of the two main support pipes 1 are supported by the limiting blocks 11, sharing the misalignment shear force brought by factors such as vibration between the two main support pipes 1, thereby protecting the bolts connecting the two main support pipes 1, extending the service life of the bolts, and improving the stability of the connection part of the two main support pipes 1 at the same time.

[0054] See Figure 9 and Figure 10 , the depth of the limiting groove 7 is not less than the generatrix length of the positioning column 5. The upper side surface of the limiting groove 7 is perpendicular to the central axis of the adjacent main support pipe 1, and the lower side surface of the limiting groove 7 is parallel to the horizontal plane. (Refer to Figure 10When the adjacent two sections of the main support pipes 1 are coaxial, the upper and lower side surfaces of the limit groove 7 are simultaneously in contact with the adjacent positioning posts 5, that is, the upper side surface of the limit groove 7 is in line contact with the adjacent positioning post 5, and the lower side surface of the limit groove 7 is in point contact with the adjacent positioning post 5.

[0055] The above settings can achieve that during the process of the limit groove 7 providing support to the positioning post 5 and the main support pipe 1 swinging, the positioning post 5 can slowly insert into the limit groove 7, and after the end faces of the two connecting flanges 2 are parallel, the upper and lower side surfaces of the limit groove 7 can be simultaneously in contact with the positioning post 5, thereby providing upper and lower direction limits for the positioning post 5 and the main support pipe 1, and at the same time reducing the distance that the middle connecting piece 4 needs to travel during the application of the pre-tightening force, improving the operation efficiency.

[0056] During the process of the operator tightening the bolt and moving the upper main support pipe 1 downward, the upper main support pipe 1 slowly approaches the lower main support pipe 1. At the same time, the upper main support pipe 1 drives the middle connecting piece 4 to move downward through the positioning post 5 and the limit groove 7, and the middle connecting piece 4 drives the adjacent four limit blocks 11 to move downward, so that the four limit blocks 11 are all out of contact with the adjacent extrusion surfaces 111; after the end faces of the two main support pipes 1 are in contact, the operator uses a tool to rotate the pre-tightening slide column 10, so that the pre-tightening slide column 10 moves downward relative to the mounting hole 101, and the distance between the extrusion surface 111 and the four limit blocks 11 gradually decreases. Finally, the four limit blocks 11 are all in contact with the extrusion surface 111. As the pre-tightening slide column 10 continues to move downward, the extrusion surface 111 simultaneously squeezes the four limit blocks 11 to move away from the central axis of the pre-tightening slide column 10 until the four limit blocks 11 are all out of contact with the extrusion surface 111, the four limit blocks 11 are all simultaneously in contact with the inner side surfaces of the two sections of the main support pipes 1, and at the same time the lower side of the pre-tightening slide column 10 is in contact with the adjacent mounting hole 101. As the operator continues to rotate the pre-tightening slide column 10, the pre-tightening slide column 10 provides a downward pre-tightening force to the adjacent main support pipe 1 through the middle connecting piece 4, the limit groove 7 and the positioning post 5, dispersing the outward pulling force at the connection of the two sections of the main support pipes 1, and at the same time using the four limit blocks 11 to provide support for the connection of the two sections of the main support pipes 1, improving the stability of the connection of the two sections of the main support pipes 1. Embodiment 6

[0057] This embodiment provides a large-span steel pipe tower structure for a transmission line, which is further optimized on the basis of Embodiment 5.

[0058] See Figure 3 、 Figure 4 and Figure 8 A plurality of friction grooves 12 are provided on the side of the limit block 11 away from the adjacent pre-tightening slide column 10, and the upper and lower parts of the friction grooves 12 are symmetrically distributed. The upper part of the friction groove 12 is used to contact the upper main support pipe 1 and increase the friction force when the upper main support pipe 1 moves upward relative to the middle connecting piece 4, and the lower friction groove 12 is the same.

[0059] The above settings can achieve that the connection between the two main support pipes 1 is connected into a whole by the friction groove 12, and part of the tensile load caused by the self-weight and wind force factors at the connection of the two main support pipes 1 is shared, thereby improving the stability of the connection of the two main support pipes 1.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are all included within the protection scope of the present invention.

Claims

1. The large-span steel pipe tower structure of a transmission line is characterized in that Comprising: A plurality of main support pipes (1), connecting flanges (2) are fixedly connected to both the upper and lower ends of the main support pipes (1). The plurality of main support pipes (1) are divided into four groups and are connected end to end through the connecting flanges (2) to form four main rods (100) of the steel pipe tower. The four main rods (100) are symmetrically distributed about the center. In the upward direction, the distance between two adjacent main rods (100) gradually decreases. A plurality of diagonal support pipes (3) are fixedly connected between two adjacent main rods (100). A cross arm (200) is fixedly connected to the four main rods (100). A docking assembly for improving the docking efficiency and safety is provided in the main support pipes (1) except for the uppermost main support pipe (1). The docking assembly includes: a middle connector (4). The middle connector (4) is arranged in the upper part of the main support pipe (1). A docking part (401) is arranged on the upper part of the middle connector (4). The docking part (401) protrudes out of the main support pipe (1). In the upward direction, the cross-sectional area of the docking part (401) intercepted by a plane perpendicular to the central axis of the main support pipe (1) gradually decreases, facilitating insertion into an adjacent main support pipe (1).

2. The large-span steel pipe tower structure for transmission lines according to claim 1, wherein The docking part (401) is provided with a guiding arc surface (6). The plane shape of the docking part (401) intercepted by a vertical plane passing through both the central axis of the main support pipe (1) and the symmetry center of the four main rods (100) is a right trapezoid, and the right-angled side of this cross-section is located on the side of the docking part (401) away from the symmetry center of the four main rods (100). The upper and lower edges of the guiding arc surface (6) are both circular, and their diameters are equal to the inner diameter of the main support pipe (1).

3. The large-span steel pipe tower structure for transmission lines according to claim 2, wherein A docking groove (501), a guiding groove (502), and a positioning groove (503) are arranged on the side of the docking part (401) away from the symmetry center of the four main rods (100). In the downward direction, the docking groove (501), the guiding groove (502), and the positioning groove (503) are communicated in sequence, and the width of the guiding groove (502) gradually decreases. Positioning columns (5) are fixedly connected to the lower parts of the sides of the main support pipes (1) away from the symmetry center of the four main rods (100) except for the lowermost main support pipe (1). The minimum width of the guiding groove (502) is equal to the width of the positioning groove (503) and is equal to the diameter of the positioning column (5).

4. The large-span steel pipe tower structure for transmission lines according to claim 3, characterized in that, The middle connector (4) slides in the upper part of the main support pipe (1). A rubber cylinder is arranged between the middle connector (4) and the main support pipe (1). When two adjacent main support pipes (1) are not docked, there is a distance between the docking part (401) and the upper end surface of the main support pipe (1), so that the two adjacent main support pipes (1) do not contact during the docking process.

5. The large-span steel pipe tower structure for a transmission line according to claim 3, characterized in that, A limiting groove (7) is provided on one side of the docking part (401) away from the symmetry center of the four main rods (100). The limiting groove (7) communicates with the adjacent positioning groove (503), and the depth of the limiting groove (7) is greater than that of the positioning groove (503) for limiting the adjacent positioning column (5).

6. The large-span steel pipe tower structure for transmission lines according to claim 3, characterized in that, Supports (8) are fixedly connected to the upper parts inside the remaining main support pipes (1) except the uppermost main support pipe (1). The supports (8) are rotatably connected with a force-applying worm (9) and a threaded worm gear (901). The main support pipe (1) is provided with a hole for the force-applying worm (9) to pass through. The force-applying worm (9) is in sealed and rotational connection with the main support pipe (1). The force-applying worm (9) meshes with the threaded worm gear (901). An installation hole (101) is provided inside the middle connecting piece (4). A pre-tightening sliding column (10) is in spline connection inside the installation hole (101). The pre-tightening sliding column (10) is in threaded connection with the threaded worm gear (901). The central axis of the pre-tightening sliding column (10) is parallel but non-intersecting with the central axis of the adjacent main support pipe (1).

7. The large-span steel pipe tower structure for transmission lines according to claim 6, characterized in that, The hole on the main support pipe (1) for the force-applying worm (9) to pass through is located on one side of the main support pipe (1) close to the symmetry center of the four main rods (100).

8. The large-span steel pipe tower structure for transmission lines according to claim 6, characterized in that, A plurality of limiting blocks (11) are slidably connected inside the middle connecting piece (4). The pre-tightening sliding column (10) is provided with an extrusion surface (111) for extruding the limiting blocks (11) to move. The limiting blocks (11) are used for supporting the connection part of two adjacent main support pipes (1).

9. The large-span steel pipe tower structure for transmission lines according to claim 8, wherein The depth of the limiting groove (7) is not less than the generatrix length of the positioning column (5). The upper side surface of the limiting groove (7) is perpendicular to the central axis of the adjacent main support pipe (1), and the lower side surface of the limiting groove (7) is parallel to the horizontal plane.

10. The large-span steel pipe tower structure for transmission lines according to claim 8, characterized in that, A plurality of friction grooves (12) are provided on one side of the limiting block (11) away from the adjacent pre-tightening sliding column (10) for increasing the friction force between the limiting block (11) and the main support pipe (1).

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