A steel tube concrete truss combined tower

Abstract

The invention patent discloses a steel tube concrete truss combined tower that can be used on land and sea, which mainly includes a tower, a steel tube concrete truss and a separate or integral foundation matched therewith. Its characteristics are: the pure steel tower is divided into several sections and several pieces, and then connected to the side of the steel tube concrete column by bolts or welding, and then the structural unit composed of the segmented tower and the steel tube concrete column is connected and fixed, and then the steel tube concrete column column support system is installed in the cylinder, and the bottom tower and the steel tube concrete column are inserted or connected to the separate or integral foundation. The advantages are: the upper structure load and self-weight are directly transmitted to the lower foundation through the tower itself, and the steel tube concrete column of the space truss is used as the cross-sectional pressure-bearing part, which greatly improves the force performance of the circular tower, directly transmits force, greatly facilitates the installation of components, is safe and reliable, reduces the amount of steel, reduces the cost, is convenient for transportation, shortens the construction period, enhances rigidity, and improves fatigue.

Description

Technical Field

[0001] The invention patent relates to the field of high-rise tower structures, and more specifically to a steel tube concrete truss combined tower. Background Art

[0002] At present, the tower structure of wind turbines in my country mainly adopts pure steel tube tower structure when the height is less than 100m; when the height reaches more than 100 meters, the pure steel tube structure is too flexible and the cross-sectional size must be increased to meet the technical requirements. When the pure steel tube structure is adopted, the structural size is large and it cannot solve the problem of the size limitation of bridges and culverts on highways during transportation. At present, wind turbine towers above 100m in engineering usually adopt concrete + pure steel tube and pure precast concrete tube structure. This type of structure has the disadvantages of large engineering volume, difficult hoisting, long construction period, high cost and poor structural reliability. According to the design of the new steel tube concrete tower structure, the cross-sectional characteristics of the tower itself are crucial. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide a new wind turbine tower structure with reliable structural performance, low steel usage, low engineering cost, convenient construction and transportation, high overall rigidity, good compressive performance and reliable connection.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a steel tube concrete truss modular tower, including a modular tower, which is formed by assembling multiple sections of cylinders along the vertical direction, and each section of the cylinder is formed by assembling multiple shells along the circumferential direction, and the cross-section of the cylinder is circular or polygonal, and is characterized in that the modular tower vertically connects at least three groups of vertical steel pipes on the tower section into one, and the steel pipes are evenly distributed along the circumference of the modular tower with the central axis of the modular tower as the axis. When the steel pipe is connected to the tower, a steel pipe can be used that is external to the tower section, or a steel pipe can be used that is internal to the tower section, or the radius of the tower section is greater than the radius of the inscribed circle of multiple steel pipes and smaller than the radius of the circumscribed circle of multiple steel pipes, and a prestressed anchor cable is provided in the steel pipe that runs through the steel pipe from the top to the bottom.

[0005] Furthermore, a leveling template ring and a fixed bottom ring are respectively provided at the top and bottom ends of the steel pipe, and connectors at both ends of the prestressed anchor cable extend out of the leveling template ring and the fixed bottom ring respectively.

[0006] Furthermore, a steel skeleton is pre-installed in the steel pipe, and the steel skeleton is formed by welding a plurality of longitudinal bars evenly distributed around the axis of the steel pipe and stirrups surrounding the longitudinal bars.

[0007] Furthermore, the prestressed anchor cable abuts against a guide structure in the steel pipe, the guide structure is connected to the inner circumference of the steel pipe, and stiffening ribs are partially arranged in the steel pipe.

[0008] Preferably, when the radius of the circular cross-section of the tower is greater than the radius of the inscribed circle of the multiple steel pipes and smaller than the radius of the circumscribed circle of the multiple steel pipes, the steel pipe is provided with at least two groups of prestressed anchor cables penetrating the steel pipe from the top end to the bottom end, one group of the two groups of prestressed anchor cables is distributed on the inside of the combined tower, and the other group is distributed on the outside of the combined tower, and the lower end of the steel pipe extends into the foundation for fixation.

[0009] Furthermore, the cylinder is connected to the steel pipe in the following manner:

[0010] The combined tower passes through the steel pipe vertically, and the steel pipe is surrounded by a tube shell A and a tube shell B. The tube shell A and the tube shell B clamp the cylinder body by fasteners, or the opposite sides of the tube shell A and the tube shell B are respectively welded to the cylinder body;

[0011] Or a slot is provided on the surface of the steel pipe, and the shell is inserted into the slot and connected to the steel pipe through fasteners or welding.

[0012] Furthermore, an inter-column truss support system is installed on the inner periphery of the combined tower, and the truss support system adopts a cross-shaped, X-shaped, zigzag, or K-shaped truss structure, and the ends of the truss are respectively fixedly connected to adjacent steel pipes.

[0013] Furthermore, the cross-section of the steel pipe includes a circle or a special shape, and the steel pipe has a uniform cross-section or a variable cross-section along the height direction. After pouring concrete in the pipe, a steel tube concrete column is formed, and the steel tube concrete column is made by prefabrication or on-site casting.

[0014] The special shapes include rectangle, T-shaped, I-shaped, crescent-shaped, or trapezoidal;

[0015] Preferably, the steel pipes are connected as a whole by multiple layers of horizontal ring beams along the vertical direction of the modular tower, and the horizontal ring beams are formed by assembling steel beams or annular steel pipes, and concrete is poured in the annular steel pipes.

[0016] The specific installation process of the steel tube concrete truss combined tower provided by the present invention is as follows:

[0017] (1) First, determine the layout and cross-sectional dimensions of the steel tube concrete columns, the concrete strength, the height and dimensions of the top pure steel tower, and the dimensions of the tower foundation according to the design indicators of the specific wind turbine equipment;

[0018] (2) Complete the corresponding foundation design drawings and component parts processing drawings, and complete the on-site tower foundation construction operations and the embedding of the corresponding pre-buried connectors;

[0019] (3) In the factory, each steel pipe is divided into sections of 1m to 100m, and flanges and steel brackets are welded on the ends of each section of the steel pipe to complete the connection of the corresponding vertical steel pipe section or spiral steel pipe section tie beam connection node;

[0020] (4) Complete the concrete pouring and maintenance operations of the corresponding steel pipe sections of each steel tube concrete leg in the factory or on site;

[0021] (5) Transport the components completed in the factory to the construction site by large transport vehicles;

[0022] (6) When transported to the construction site, if the corresponding steel pipe sections of the inclined steel tube concrete legs have not undergone concrete pouring and curing operations, then on the construction site, it is necessary to first connect and fix the steel pipe sections at the bottom of each inclined steel tube concrete leg to the embedded parts buried in the corresponding tower foundation through embedded bolts, and then connect and fix the remaining steel tube concrete sections of each inclined steel tube concrete leg from bottom to top through flanges and high-strength bolts, and then pour concrete and maintain the hollow steel pipes of the fixed steel tube concrete legs. Finally, the top of the steel tube concrete column is connected and fixed to the designated position or top of the tower through flanges and welding. After steel bars or steel sections are arranged in the column, prestressing construction is implemented.

[0023] Compared with the prior art, the present invention has the following beneficial effects and advantages:

[0024] (1) With this structural design, when concrete is poured into the steel tube and the concrete column is connected to the tower as a whole, compared with the existing pure steel tower or the technical solution of erecting a truss support outside the tower, the steel tube column provides lateral support for the thin-walled tower, and the thickness of each section of the tower is significantly lower than the thickness of the existing pure tower structure, which reduces the use of steel and reduces the project cost. The tower is no longer borne by the tower shell, but by the steel tube-concrete column. Therefore, the compressive performance is good. When the tower with a height of more than 100m needs to be designed, the current pure steel tube structure is too flexible and cannot meet the technical requirements of the wind turbine equipment. In order to meet the technical requirements of the wind turbine equipment, the cross-sectional size needs to be increased, which leads to a large structural size and cannot solve the problem of the size restriction of the bridge and culvert of the highway during transportation;

[0025] (2) When the tower is horizontally displaced by wind or earthquake, the gravity load will cause displacement of the structure and increase the internal force, leading to structural instability. Compared with the existing concrete + pure steel tube and pure precast concrete tube structure or the technical solution of erecting truss support outside the tower, it avoids the serious consequences such as tower instability and damage caused by the tower body buckling, and can solve the problems of large engineering volume, difficult hoisting, long construction period, high cost and poor structural reliability;

[0026] (3) When the height of the wind turbine exceeds a certain height, it can solve the problems of the wind turbine tower being too large, inconvenient to transport, too heavy, difficult to hoist, and too flexible to meet the installation requirements of the wind turbine equipment;

[0027] (4) It has the advantages of safe and reliable structure, easy installation, short construction period and low project cost.

[0028] (5) The connection parts between the truss and the tower, the steel frame and the tower, and the prestressed anchor cables are wrapped in concrete or steel pipes or towers to prevent rust and falling off of the connection parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of Embodiment 1 of the steel tube concrete truss tower of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the connection method of the steel tube concrete column foundation;

[0031] Figure 3 for Figure 1 A schematic diagram of the cross-section structure of

[0032] Figure 4 It is a structural schematic diagram of a cross section of an implementation mode of Example 2 of a steel tube concrete truss tower group of the present invention;

[0033] Figure 5 It is a structural schematic diagram of a cross section of another implementation mode of Example 2 of a steel tube concrete truss tower group of the present invention;

[0034] Figure 6 for Figure 5 Schematic diagram of the three-dimensional structure;

[0035] Figure 7 is a schematic diagram of the three-dimensional structure of Example 3;

[0036] Figure 8 is a schematic structural diagram of a cross section of Example 3;

[0037] Fig. 9 is a schematic structural diagram of a cross section of a steel pipe in Example 2;

[0038] Fig.10 This is the mises stress cloud diagram of the existing pure steel tower;

[0039] Fig.11 This is the lateral displacement cloud diagram of the existing pure steel tower;

[0040] Fig.12 is the mises stress cloud diagram of the tower in Example 1;

[0041] Fig.13 This is a lateral displacement cloud diagram of the tower in Example 1. DETAILED DESCRIPTION

[0042] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following further explains how the present invention is implemented in conjunction with the accompanying drawings and specific implementation methods.

[0043] Example 1

[0044] like Figure 1 a~1b and Figure 2 As shown, the steel tube concrete truss combined tower includes a combined tower 1, which is formed by assembling multiple sections of cylinders 11 along the vertical direction, and each section of the cylinder 11 is formed by assembling multiple shells 12 along the circumferential direction. The cross-section of the cylinder 11 is circular or polygonal. The combined tower 1 connects more than three steel pipes 2 into one along the vertical direction. All steel pipes are evenly distributed along the circumferential direction of the combined tower 1 with the central axis of the combined tower 1 as the axis. Each steel pipe 2 is formed by assembling multiple sections of hollow steel pipes 21. Flanges 24 are welded at both ends of each hollow steel pipe 21. A steel skeleton 4 is pre-installed in each steel pipe. The steel skeleton 4 is composed of a steel pipe wrapped around the steel pipe. 1 is formed by welding a plurality of longitudinal bars 41 evenly distributed on the axis and stirrups 42 surrounding the longitudinal bars 41. Stiffening ribs 6 are also partially arranged in the steel pipe 1. A leveling template ring 22 and a fixed bottom ring 23 are respectively arranged at the top and bottom ends of each steel pipe 2. At least two groups of prestressed anchor cables 3 penetrate the steel pipe 2 from the top to the bottom. The connectors at both ends of the prestressed anchor cables 3 extend out of the leveling template ring 22 and the fixed bottom ring 23 respectively. One group of the two groups of prestressed anchor cables 3 is distributed on the inner side of the combined tower 1, and the other group is distributed on the outer side of the combined tower 2. The lower end of the steel pipe 2 extends into the foundation 5 and is inserted into the foundation cap or pile to form a pile-column integrated foundation 5.

[0045] Optionally, all the steel pipes 2 are also connected as a whole by multiple layers of horizontal ring beams 7 along the vertical direction of the modular tower 1, and the horizontal ring beams are formed by assembling annular steel pipes.

[0046] The installation process of the steel tube concrete truss combined tower in this embodiment is as follows:

[0047] (1) First, determine the steel pipe layout and cross-sectional dimensions, steel pipe strength, top pure steel tower height and dimensions, and tower foundation dimensions based on the design indicators of the specific wind turbine equipment;

[0048] (2) Complete the corresponding foundation design drawings and component parts processing drawings, and complete the on-site tower foundation construction operations and the embedding of the corresponding pre-buried connectors;

[0049] (3) In the factory, each steel pipe is divided into multiple hollow steel pipe sections according to the standard of 1m to 100m sections, and flanges and stiffening ribs 6 are welded to the ends of each hollow steel pipe section. Optionally, the connection nodes of the corresponding vertical steel pipe sections and the horizontal ring beam 7 can also be connected;

[0050] (4) At the construction site, the hollow steel pipe section of each steel pipe to be placed at the bottom must be connected and fixed to the embedded parts buried in the corresponding foundation through embedded bolts, and the bottom end of the prestressed anchor cable must be fixed to the bottom of the fixed bottom ring. A steel skeleton and welded stiffening ribs must be pre-installed in the hollow steel pipe. The remaining hollow steel pipe sections of each steel pipe must then be connected and fixed in sequence from bottom to top through flanges and high-strength bolts. The steel skeleton must be extended upward, and the prestressed anchor cable must pass through the steel pipe to the upper side of the leveling template ring and be fixed. The fixed hollow steel pipe must then be poured with concrete and maintained.

[0051] (5) The tower shell is installed layer by layer along the multiple steel pipes that are surrounded in a ring shape. The two sides of the shell are welded to the surface of the adjacent steel pipes. Figure 3 .

[0052] Alternatively, a slot is reserved on the surface of the hollow steel pipe when the hollow steel pipe section is prefabricated. During the on-site installation process of step (4), the shell of each layer of cylinder is inserted into the slot of the hollow steel pipe of that layer and immediately welded and fixed. The lower cylinder is connected to the upper cylinder by a flange.

[0053] In this embodiment, no concrete is poured into the hollow steel tube, which saves materials. The prestressed anchor cables are arranged inside and outside the tower, which can improve and adjust the stiffness of the tower body and avoid excessive stiffness differences between the inside and outside of the tower. The steel pipe column provides lateral support for the thin-walled tower. The thickness of each section of the tower is significantly lower than that of the existing pure tower structure, which reduces the amount of steel used and the project cost. The tower is no longer borne by the tower shell, but by the steel pipe and its steel skeleton, so the compressive resistance is good and the stiffness of the tower is increased. It is easier to install steel pipes when the cross section of the cylinder is polygonal.

[0054] Example 2

[0055] like Figure 4 This embodiment is an improvement on the structure of Embodiment 1, and the improvement is as follows: the modular tower 1 passes through all the steel tubes 2 vertically, and the steel tubes 2 are surrounded by a tube shell A and a tube shell B. The tube shell A and the tube shell B clamp the cylinder of the modular tower 1 through fasteners, or the opposite sides of the tube shell A and the tube shell B are respectively welded to the cylinder of the modular tower 1.

[0056] like Figure 5-6 Optionally, concrete can be poured into the multiple hollow steel pipes 21 to form concrete columns 8. The remaining structures of this embodiment are the same as those of embodiment 1. Fig. 9 a. Fig. 9 b. Fig. 9 c is a schematic diagram of three cross sections of the steel pipe 2, wherein Fig. 9 The structure of c uses welding technology to connect the tube shell A, tube shell B and tower 1, and the others are connected by fastening.

[0057] The installation process of the steel tube concrete truss combined tower in this embodiment is as follows:

[0058] (1) First, determine the steel pipe layout and cross-sectional dimensions, steel pipe strength, top pure steel tower height and dimensions, and tower foundation dimensions based on the design indicators of the specific wind turbine equipment;

[0059] (2) Complete the corresponding foundation design drawings and component parts processing drawings, and complete the on-site tower foundation construction operations and the embedding of the corresponding pre-buried connectors;

[0060] (3) In the factory, each steel pipe is divided into multiple hollow steel pipes according to the standard of 1m to 100m per section. Each hollow steel pipe is cut into a tube shell A and a tube shell B along the longitudinal direction, and stiffening ribs 6 and flanges of matching shape are welded at the ends of each tube shell A and tube shell B;

[0061] (4) On the construction site, the hollow steel pipe sections of each steel pipe to be placed at the bottom need to be assembled by fasteners, and connected and fixed to the embedded parts buried in the corresponding foundation by embedded bolts. At the same time, the bottom end of the prestressed anchor cable is fixed to the lower side of the fixed bottom ring, and a steel skeleton and welded stiffening ribs are pre-placed in the hollow steel pipe. Then, the shell of the combined tower tube forming an annular cylinder is placed on the upper layer, and the adjacent shells are welded or fastened together. The longitudinal reinforcement of the steel skeleton is vertically connected on the shell with semi-circular stirrups. Embrace and fix, weld stiffening ribs on the shell to connect the longitudinal reinforcement and the shell, extend the steel skeleton upward, and then fix the tube shell A and tube shell B of the upper layer of hollow steel pipe section through flanges and high-strength bolts, and clamp the shell of this layer of shell with fasteners or directly weld it to the shell, install each layer of steel pipe and steel skeleton from bottom to top according to this step, and at the same time make the prestressed anchor cable pass through the steel pipe to reach the upper side of the leveling template ring and fix it, and then pour concrete into the hollow steel pipe of the fixed steel pipe and perform maintenance operations.

[0062] The improvement of this embodiment makes the connection between the tower and the steel pipe more stable. The cylinder body can be arranged inside the inscribed circle and outside the circumscribed circle of the steel pipe. If it is arranged inside the inscribed circle, the cross-sectional bending coefficient is low and the bending resistance is reduced, but it is beneficial to the anti-corrosion maintenance of the steel tower. If it is arranged outside the circumscribed circle, it is beneficial to improve the bending resistance of the tower and can also improve the anti-buckling capacity of the tower, but more steel is required. The steel pipe in this embodiment is divided into a tube shell A and a tube shell B, and the cylinder body passes between the tube shell A and the tube shell B, so that the tube shell B has a strong anti-corrosion ability. At the same time, the tube shell A and the tube shell B wrap the tower as a whole, so that the tower forms a whole in the circumferential direction, so there is no need to arrange a horizontal ring beam to maintain all the steel pipes.

[0063] Example 3

[0064] like Figures 7-8 This embodiment is an improvement on the structure of Embodiments 1 to 2, and the improvement is as follows: a column truss 9 is installed on the inner periphery of the assembled tower 1, and the truss 9 adopts an X-shaped truss structure, and the ends of the cross truss 9 are respectively fixedly connected to the adjacent steel pipes 2. In this embodiment, since the truss 9 is installed in the tower 1, the rigidity of the tower 1 can be enhanced. In order to further save materials, the tube shell B for installing the steel pipe 2 in the tower can be omitted, and the two ends of the truss 9 are directly fixedly connected to the tube shell A of the adjacent steel pipe 2 facing the tower 1.

[0065] Therefore, during the installation of the steel tube concrete truss combined tower of this embodiment, the trusses 9 must be installed simultaneously when installing layer by layer in step (4).

[0066] Strength calculation example of existing tower:

[0067] 1. Calculation parameters

[0068] (1) Model weight (gravitational acceleration due to self-weight g = 9.8 - calculated by the software)

[0069] (2) Load conditions

[0070] Table 1: Tower top load conditions (force: KN moment KN.M)

[0071]

[0072]

[0073] (3) Material parameters

[0074] 1) Steel Q345B

[0075] Modulus of elasticity: 2x10 11 N / m 2

[0076] Mass density: 7.8x10 3 kg / m3 Poisson's ratio: 0.3

[0077] 2) Concrete C50

[0078] Modulus of elasticity: 3.45x10 10 N / m 2

[0079] Mass density: 2.4x10 3 kg / m 3 Poisson's ratio: 0.2

[0080] 2. Calculation results (finite element calculation software-abaqus6.14)

[0081] 1) Original pure steel tower

[0082] Table 2: Original tower design parameters

[0083]

[0084] Table 3: Calculation results (Mz condition)

[0085] Calculation indicators mises stress Displacement frequency Calculation results 192MPa(bottom) 2.53m(top) 0.24HZ

[0086] like Fig.10 and Fig.11 They are tower mises stress cloud diagram and tower lateral displacement cloud diagram respectively. If the wall thickness is changed, such as becoming thinner, the displacement will increase and the frequency will decrease. When it drops below 0.2, it will be close to the tower working frequency and cause resonance.

[0087] 2) Strength calculation example of the tower after pouring concrete in this embodiment 1:

[0088] Table 4: Tower design parameters of Example 1

[0089]

[0090] Table 5: Calculation results (Mz condition)

[0091]

[0092] like Fig.12 and Fig.13 They are respectively the tower mises stress cloud map and the tower lateral displacement cloud map of Example 1.

[0093] in conclusion:

[0094] (1) When the frequency is the same, the comparison between Table 5 and Table 4 shows that the amount of steel used is about 600 tons less.

[0095] (2) The new tower solution can effectively reduce the lateral displacement deformation of the tower top. When the frequency is the same, the lateral displacement of 1.70 in Table 5 is about 30% lower than the lateral displacement of 2.53 in Table 3.

[0096] (3) The results of the new tower solution show that the local stress is 319 MPa, which is a stress concentration phenomenon. It is located at the joints of different wall thicknesses and can be treated by using a thickened structure.

[0097] (4) In the calculation example of the new tower, the inter-column support system was not adopted. If the inter-column support system was adopted, the stress level could be further reduced, the lateral deformation of the tower could be reduced, and the structural mechanical properties could be improved.

Claims

1. A steel tube concrete truss combined tower, comprising a combined tower, wherein the combined tower is formed by assembling multiple sections of cylinders in the vertical direction, each section of the cylinder is formed by assembling multiple shells in the circumferential direction, and the cross section of the cylinder is circular or polygonal, characterized in that: The combined tower vertically connects at least three vertical steel pipes on the cross section of the tower into one, and the steel pipes are evenly distributed along the circumference of the combined tower with the central axis of the combined tower as the axis. When the steel pipe is connected to the tower, the steel pipe can be connected to the tower cross section externally, or the steel pipe can be connected to the tower cross section internally, or the radius of the tower cross section is greater than the radius of the inscribed circle of the multiple steel pipes and smaller than the radius of the circumscribed circle of the multiple steel pipes, and the steel pipe is provided with a prestressed anchor cable penetrating the steel pipe from the top end to the bottom end; A steel skeleton is pre-installed in the steel pipe, and the steel skeleton is formed by welding a plurality of longitudinal bars uniformly distributed around the axis of the steel pipe and stirrups surrounding the longitudinal bars; the prestressed anchor cable abuts against a guide structure in the steel pipe, and the guide structure is connected to the inner circumference of the steel pipe, and stiffening ribs are also partially arranged in the steel pipe; when the radius of the circular cross-section of the tower is greater than the radius of the inscribed circle of the plurality of steel pipes and less than the radius of the circumscribed circle of the plurality of steel pipes, at least two groups of prestressed anchor cables are arranged in the steel pipe from the top to the bottom, one group of the two groups of prestressed anchor cables is distributed on the inner side of the combined tower, and the other group is distributed on the outer side of the combined tower, and the lower end of the steel pipe extends into the foundation for fixing; The cylinder body is connected to the steel pipe in the following manner: the combined tower passes through the steel pipe vertically, the steel pipe is surrounded by a tube shell A and a tube shell B, the tube shell A and the tube shell B clamp the cylinder body by fasteners, or the tube shell A and the tube shell B are respectively welded to the cylinder body on the opposite sides; or a slot is provided on the surface of the steel pipe, and the shell is inserted into the slot and connected to the steel pipe by fasteners or welding.

2. The steel tube concrete truss combined tower according to claim 1, characterized in that: The top and bottom ends of the steel pipe are respectively provided with a leveling template ring and a fixed bottom ring, and the connectors at both ends of the prestressed anchor cable extend out of the leveling template ring and the fixed bottom ring respectively.

3. The steel tube concrete truss combined tower according to claim 1, characterized in that: The inner periphery of the combined tower is provided with an inter-column truss support system, the truss adopts a cross-shaped, X-shaped, zigzag, or K-shaped truss structure, and the ends of both ends of the truss are respectively fixedly connected to adjacent steel pipes.

4. The steel tube concrete truss combined tower according to claim 3, characterized in that: The cross section of the steel tube includes a circle, and the steel tube has a uniform cross section or a variable cross section along the height direction. After the concrete is filled in the tube, a steel tube concrete column is formed. The steel tube concrete column is made by prefabrication or on-site casting.

5. The steel tube concrete truss combined tower according to claim 4, characterized in that: The steel pipes are connected as a whole by multiple layers of horizontal annular ribs or ring beams along the vertical direction of the combined tower. The ring beams are formed by assembling steel beams or annular steel pipes, and concrete is poured in the annular steel pipes.

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