CN112360697A

CN112360697A - Steel pipe concrete truss combination formula tower section of thick bamboo

Info

Publication number: CN112360697A
Application number: CN202011187701.2A
Authority: CN
Inventors: 廖明进; 廖显锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-02-12
Anticipated expiration: 2040-10-30
Also published as: CN112360697B

Abstract

The patent of the present invention discloses a concrete-filled steel tube truss combined tower that can be used on land and sea, mainly including a tower, a concrete-filled steel tube truss and a separate or integral foundation matched with it. It is divided into several sections and several pieces, and then bolts or welding are used to connect it to the side of the CFST column, and then the structural unit formed by the connection of the segmented tower and the CFST column is connected and fixed, and then the support between the CFST columns in the tube is installed. system and insert or connect bottom towers and CFST columns to split or monolithic foundations. The advantages are: the upper structure load and self-weight are directly transferred to the lower foundation through the tower itself, and the concrete-filled steel tubular column of the space truss is used as the section pressure-bearing part, which greatly improves the mechanical performance of the circular tower, and the force is directly transmitted, which greatly facilitates the installation of components. Installation, safe and reliable, reduce steel consumption, reduce cost, facilitate transportation, shorten construction period, enhance rigidity and improve fatigue.

Description

Steel pipe concrete truss combination formula tower section of thick bamboo

Technical Field

The invention relates to the field of high-rise tower structures, in particular to a steel pipe concrete truss combined tower cylinder.

Background

At present, when the height of a tower structure of a wind generating set in China is within 100m, a pure steel cylinder tower structure is mainly adopted; when the height reaches more than 100 meters, the section size needs to be increased to meet the technical requirements because the structure of the pure steel cylinder is too flexible. When adopting pure steel cylinder structure, the structural dimension is big, receives highway's bridge and culvert size restriction problem during unable solution transportation. At present, the wind turbine tower cylinder with the height of more than 100m in engineering generally adopts a concrete + pure steel cylinder and pure precast concrete cylinder structure, and the structural form has the defects of large engineering quantity, difficult hoisting, long construction period, high cost, poor structural reliability and the like. According to novel steel pipe concrete tower section of thick bamboo structural design, tower section of thick bamboo self section characteristic is crucial.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a novel fan tower structure which has reliable structural performance, less steel consumption, low construction cost, convenient construction and transportation, large integral rigidity, good compression resistance and reliable connection.

In order to achieve the purpose, the invention adopts the technical scheme that: the combined type tower cylinder is characterized in that the combined type tower cylinder vertically connects at least three groups of vertical steel pipes on the cross section of the tower cylinder into a whole, the steel pipes are uniformly distributed along the circumferential direction of the combined type tower cylinder by taking a center shaft of the combined type tower cylinder as an axis, the steel pipes can be connected with the tower cylinder by adopting a tower cylinder cross section external steel pipe or a tower cylinder cross section internal steel pipe or a radius of the tower cylinder cross section larger than a plurality of internal tangent circle radii and smaller than a plurality of external tangent circle radii, and the steel pipes are internally provided with prestressed anchor cables which penetrate through the steel pipes from the top end to the bottom end.

Furthermore, the top end and the bottom end of the steel pipe are respectively provided with a leveling template ring and a fixed bottom ring, and connectors at two ends of the prestressed anchor cable respectively extend out of the leveling template ring and the fixed bottom ring.

Furthermore, a steel bar framework is preset in the steel pipe and is formed by welding a plurality of longitudinal bars which are uniformly distributed around the axis of the steel pipe and stirrups which surround the longitudinal bars.

Furthermore, the prestressed anchor cable is abutted to a guide structure in the steel pipe, the guide structure is connected with the inner periphery of the steel pipe, and stiffening ribs are arranged in the steel pipe locally.

Preferably, when the radius of the circular section of the tower is larger than the radius of the inscribed circle of the plurality of steel pipes and smaller than the radius of the inscribed circle of the plurality of steel pipes, at least two groups of prestressed anchor cables penetrating through the steel pipes from the top end to the bottom end are arranged in the steel pipes, one group of the two groups of prestressed anchor cables is distributed on the inner side of the combined tower barrel, the other group of the two groups of prestressed anchor cables is distributed on the outer side of the combined tower barrel, and the lower ends of the steel pipes extend into the foundation to be fixed.

Further, the cylinder body is connected with the steel pipe in the following mode:

the combined tower cylinder vertically penetrates through the steel pipe, the steel pipe is formed by a pipe shell A and a pipe shell B in a surrounding mode, the pipe shell A and the pipe shell B clamp the cylinder body through a fastening piece, or one side, opposite to the pipe shell A and the pipe shell B, of the pipe shell A is connected with the cylinder body in a welding mode;

or the surface of the steel pipe is provided with a slot, and the shell is inserted into the slot and is connected with the steel pipe through a fastener or welding.

Furthermore, a truss support system between the columns is installed on the inner periphery of the combined tower cylinder, the truss support system adopts a cross type, X type, Z type or K type truss structure, and the ends of the two ends of the truss are respectively and fixedly connected to the adjacent steel pipes.

Further, the section of the steel pipe comprises a round or irregular shape, the steel pipe is in an equal section or variable section form along the height direction, a concrete filled steel pipe column is formed after concrete is poured in the steel pipe, and the concrete filled steel pipe column is manufactured in a prefabrication or cast-in-place mode.

The special shape comprises a rectangle, a T shape, an I shape, a crescent or a trapezoid;

preferably, the steel pipes are connected into a whole by a plurality of layers of horizontal ring beams along the vertical direction of the combined tower, the horizontal ring beams are formed by assembling steel beams or annular steel pipes, and concrete is poured into the annular steel pipes.

The concrete-filled steel tube truss combined tower provided by the invention has the following specific installation process:

(1) firstly, determining the arrangement and section size of a concrete filled steel tubular column, the strength of concrete, the height and size of a top pure steel tower cylinder and the basic size of the tower cylinder according to the design indexes of specific fan equipment;

(2) completing corresponding basic design drawings and component part processing drawings, and simultaneously completing construction operation of a tower drum foundation on site and embedding work of corresponding embedded connecting pieces;

(3) in a factory, each steel pipe is divided according to a standard of 1-100 m sections, and a flange and a steel bracket are welded at the end part of each section of steel pipe to complete the connection of the corresponding vertical steel pipe section or spiral steel pipe section tie beam connection node;

(4) the concrete pouring and maintenance operation of the steel pipe section corresponding to each steel pipe concrete limb is completed in a factory or on site;

(5) transporting each component finished in the factory to a construction site through a large-scale transport vehicle;

(6) when the concrete column is transported to a construction site, if the concrete column is a steel pipe section corresponding to the inclined concrete leg which is not subjected to concrete pouring and curing operation, the steel pipe section at the bottom end of each inclined concrete leg needs to be connected and fixed with an embedded part embedded in a corresponding tower foundation through an embedded bolt on the construction site, then the rest steel pipe sections of each inclined concrete leg are sequentially connected and fixed from bottom to top through a flange and a high-strength bolt, then concrete pouring and curing operation is carried out on the hollow steel pipe of the fixed concrete leg, finally the top end of the concrete column is connected and fixed at a specified position or the top of a tower barrel through a flange and a welding mode, and prestress construction is carried out after reinforcing steel bars or section steel are arranged in the column.

Compared with the prior art, the invention has the following beneficial effects and advantages:

(1) by adopting the structural design scheme, when concrete is poured in the steel tube and the concrete column and the tower cylinder are connected into a whole, compared with the prior pure steel tower cylinder or the technical proposal of erecting the truss support outside the tower cylinder, the steel pipe column provides lateral support for the thin-wall tower cylinder, the thickness of each section of tower cylinder is obviously reduced compared with the thickness of the cylinder body of the prior pure tower cylinder structure, the steel material usage amount is reduced, the engineering cost is reduced, the tower cylinder does not bear vertical pressure by the tower cylinder shell, but the steel tube-concrete column bears the vertical pressure, so the compression resistance is good, when the tower barrel with the height more than 100m needs to be designed, the prior pure steel cylinder has a too flexible structure, cannot meet the technical requirements of fan equipment, needs to increase the section size in order to meet the technical requirements of the fan equipment, further, the structure size is large, and the problem that the transportation is limited by the bridge and culvert size of the highway cannot be solved;

(2) when the tower barrel is subjected to wind power or earthquake to generate horizontal displacement, the gravity load causes the displacement and internal force of the structure to be increased, so that the structure is unstable, compared with the prior concrete + pure steel barrel and pure precast concrete barrel structure or the technical scheme of erecting a truss support outside the tower barrel, the serious consequences of instability and damage of the tower barrel caused by the buckling of the barrel body of the tower barrel are avoided, and the problems of large engineering quantity, difficult hoisting, long construction period, high cost and poor structural reliability can be solved;

(3) when the height of the fan exceeds a certain height, the problems of overlarge size, inconvenience in transportation, overweight structure, difficulty in hoisting and the like of a fan tower frame and the problems of overlarge structure and incapability of meeting the installation requirement of fan equipment can be solved;

(4) the construction method has the advantages of safe and reliable structure, convenience in installation, short construction period, low construction cost and the like.

(5) The connecting parts of the truss and the tower drum, the steel reinforcement framework and the tower drum and the prestressed anchor cable are wrapped in concrete or a steel pipe or the tower drum, so that the connecting parts are prevented from being corroded and falling off.

Drawings

FIG. 1 is a schematic structural view of an embodiment 1 of a concrete filled steel tube truss assembled tower of the present invention;

FIG. 2 is a schematic view illustrating a connection mode of the concrete filled steel tube column foundation of FIG. 1;

FIG. 3 is a schematic structural view of the cross section of FIG. 1;

FIG. 4 is a schematic cross-sectional view of an embodiment of a concrete filled steel tubular truss grouped tower of the present invention;

FIG. 5 is a schematic cross-sectional view of another embodiment of a concrete filled steel tubular truss grouped tower of the present invention;

FIG. 6 is a schematic perspective view of FIG. 5;

FIG. 7 is a schematic perspective view of the preferred embodiment 3;

FIG. 8 is a schematic structural view in cross section of example 3;

FIG. 9 is a structural view showing a cross section of a steel pipe in example 2;

FIG. 10 is a mist stress cloud of a conventional pure steel tower drum;

FIG. 11 is a side displacement cloud of a conventional pure steel tower drum;

FIG. 12 is a mist stress cloud for the tower of example 1;

FIG. 13 is a cloud view of lateral displacements of the tower of example 1.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the patent of the invention easy to understand, the following description is further provided for describing how the patent of the invention is implemented by combining the attached drawings and the detailed implementation modes.

Example 1

As shown in fig. 1 a-1 b and fig. 2, the steel pipe concrete truss combined tower comprises a combined tower barrel 1, the combined tower barrel 1 is vertically assembled by multiple sections of barrels 11, each section of barrel 11 is assembled by multiple pieces of shells 12 along the circumferential direction, the section of barrel 11 is circular or polygonal, combined tower barrel 1 vertically connects more than 3 steel pipes 2 into a whole, all steel pipes are uniformly distributed along the circumferential direction of combined tower barrel 1 by taking the central axis of combined tower barrel 1 as the axis, each steel pipe 2 is assembled by multiple sections of hollow steel pipes 21, two ends of each section of hollow steel pipe 21 are respectively welded with flange plates 24, a steel reinforcement framework 4 is preset in each steel pipe, the steel reinforcement framework 4 is formed by welding multiple longitudinal ribs 41 uniformly distributed around the axis of steel pipe 1 and stirrups 42 surrounding longitudinal ribs 41, stiffening ribs 6 are also locally arranged in steel pipe 1, the top end and bottom end of each steel pipe 2 are respectively provided with leveling template rings 22 and fixed bottom rings 23, at least two groups of prestressed anchor cables 3 penetrate through the steel pipe 2 from the top end to the bottom end, connectors at two ends of the prestressed anchor cables 3 respectively extend out of the leveling template ring 22 and the fixed bottom ring 23, one group of the two groups of prestressed anchor cables 3 are distributed on the inner side of the combined tower barrel 1, the other group of the two groups of prestressed anchor cables is distributed on the outer side of the combined tower barrel 2, and the lower end of the steel pipe 2 extends into the foundation 5 and is inserted into a foundation bearing platform or a pile to form the pile-column integrated foundation 5.

Optionally, all the steel pipes 2 are further connected into a whole by multiple layers of horizontal ring beams 7 along the vertical direction of the combined tower barrel 1, and the horizontal ring beams are formed by splicing annular steel pipes.

The installation process of the steel pipe concrete truss combined type tower cylinder of the embodiment is as follows:

(1) firstly, determining the arrangement and section size of a steel pipe, the strength of the steel pipe, the height and size of a top pure steel tower cylinder and the basic size of the tower cylinder according to the design index of specific fan equipment;

(3) in a factory, each steel pipe is divided into a plurality of sections of hollow steel pipes according to the standard of 1-100 m, a flange and a stiffening rib 6 are welded at the end part of each section of hollow steel pipe, and optionally, the connection of the corresponding vertical steel pipe section and the connecting node of the horizontal ring beam 7 can be completed;

(4) on the site of a construction site, hollow steel pipe sections of each steel pipe to be placed at the bottom end are connected and fixed with embedded parts embedded in corresponding foundations through embedded bolts, the bottom end of a prestressed anchor cable is fixed to the lower side of a fixed bottom ring, a steel bar framework and welding stiffening ribs are pre-arranged in the hollow steel pipe, then the rest hollow steel pipe sections of each steel pipe are sequentially connected and fixed from bottom to top through flanges and high-strength bolts, the steel bar framework extends upwards, the prestressed anchor cable penetrates through the steel pipe to reach the upper side of a leveling template ring and is fixed, and then concrete pouring and maintenance operation are carried out on the hollow steel pipes of the fixed steel pipes.

(5) And (3) upwards mounting the shell of the tower cylinder layer by layer along a plurality of steel pipes which surround the tower cylinder in a ring shape, and welding and connecting two sides of the shell with the surfaces of the adjacent steel pipes as shown in figure 3.

Or reserving slots on the surface of the hollow steel pipe when the hollow steel pipe section is prefabricated, inserting the shell of each layer of the cylinder body into the slots of the layer of the hollow steel pipe in the field installation process in the step (4), and welding and fixing the shell at the vertical moment, wherein the lower layer of the cylinder body is connected with the upper layer of the cylinder body through a flange.

In the embodiment, the hollow steel tube is internally provided with no concrete, so that materials are saved, the prestressed anchor cables are arranged in the tower barrel and outside the tower barrel, the rigidity of the tower body can be improved and adjusted, meanwhile, the overlarge difference of the rigidity inside and outside the tower barrel is avoided, the steel tube columns provide lateral support for the thin-wall tower barrel, the thickness of each section of tower barrel is obviously reduced compared with that of the existing pure tower barrel structure, the steel material usage amount is reduced, the engineering cost is reduced, the tower barrel is not used for bearing vertical pressure by a tower barrel shell, but is used for bearing vertical pressure by the steel tube and a steel reinforcement framework thereof, so that the compression resistance is. The steel pipe is easier to be installed when the cross section of the cylinder body is polygonal.

Example 2

As shown in fig. 4, this embodiment is an improvement on the structure of embodiment 1, and the improvement is: the combined tower cylinder 1 vertically penetrates through all steel pipes 2, the steel pipes 2 are surrounded by the pipe shell A and the pipe shell B, the pipe shell A and the pipe shell B clamp a cylinder body of the combined tower cylinder 1 through fasteners, or one side, opposite to the pipe shell A and the pipe shell B, of the pipe shell A is connected with the cylinder body of the combined tower cylinder 1 in a welding mode.

As shown in fig. 5 to 6, concrete may be optionally poured into the multiple hollow steel pipes 21 to form the concrete column 8, and the rest of the structure of the present embodiment is the same as that of embodiment 1. Fig. 9a, 9B and 9c are schematic cross-sectional views of a steel tube 2, wherein the structure of fig. 9c adopts a welding process to connect the tube shells a and B with the tower 1, and the other structures adopt a fastening manner.

(3) in a factory, each steel pipe is divided into a plurality of sections of hollow steel pipes according to the standard of 1-100 m, each section of hollow steel pipe is longitudinally divided into a pipe shell A and a pipe shell B, and a stiffening rib 6 and a flange plate with matched shapes are welded at the end parts of each section of pipe shell A and the pipe shell B;

(4) on the site, each hollow steel pipe section to be placed at the bottom end is assembled by fasteners, and is connected and fixed with embedded parts embedded in corresponding foundations by embedded bolts, the bottom end of a prestressed anchor cable is fixed at the lower side of a fixed bottom ring, a steel bar framework and a welding stiffening rib are preset in the hollow steel pipe, then a shell of a combined tower drum which is enclosed into an annular cylinder is placed on the upper layer of the shell, adjacent shells are welded or fastened and connected, a longitudinal bar of the steel bar framework is surrounded and fixed by a semi-annular stirrup on the shell along the vertical direction, the stiffening rib is welded on the shell to connect the longitudinal bar and the shell, the steel bar framework extends upwards, then a shell A and a shell B of the hollow steel pipe section on the upper layer are connected and fixed by flanges and high-strength bolts, and the shell A and the shell B clamp the shell or directly weld the shell on the shell by fasteners, and sequentially installing each layer of steel pipe and the steel reinforcement framework from bottom to top, simultaneously enabling the prestressed anchor cable to penetrate through the steel pipe to reach the upper side of the leveling template ring and be fixed, and then performing concrete pouring and curing operation on the hollow steel pipe of the fixed steel pipe.

The improvement of this embodiment makes the tower section of thick bamboo more firm with being connected of steel pipe, the barrel can be arranged within the inscribed circle of steel pipe and outside the circumscribed circle, arrange within the inscribed circle, cross-section bending resistance coefficient is lower, bending resistance reduces, but be favorable to the anticorrosive maintenance of steel tower, arrange outside the circumscribed circle, be favorable to improving tower section of thick bamboo bending resistance, also can improve tower section of thick bamboo buckling resistance, but need more steel, this embodiment steel pipe divide into that tube A encloses with tube B, the barrel passes from between tube A and the tube B, make tube B corrosion protection ability strong, tube A and the whole package tower section of thick bamboo of tube B simultaneously, make tower section of thick bamboo hoop form wholly, consequently, need not arrange the horizontal ring roof beam that keeps all steel pipes.

Example 3

As shown in fig. 7 to 8, the present embodiment is an improvement on the structure of embodiments 1 to 2, and the improvement is: the inner periphery of the combined tower barrel 1 is provided with an intercolumnar truss 9, the truss 9 adopts an X-shaped truss structure, and the ends of the two ends of the cross truss 9 are respectively and fixedly connected to the adjacent steel pipes 2. In this embodiment, the truss 9 is installed in the tower tube 1, so that the rigidity of the tower tube 1 can be enhanced, a tube shell B for installing the steel tube 2 in the tower tube can be omitted for further saving materials, and the truss 9 is directly used, and two ends of the truss 9 are fixedly connected to one side, facing the tower tube 1, of the tube shell a of the adjacent steel tube 2.

Therefore, in the installation process of the steel pipe concrete truss combined tower cylinder of the embodiment, the truss 9 is also installed at the same time when the steel pipe concrete truss combined tower cylinder is installed layer by layer in the step (4).

Strength calculation example of tower cylinder in prior art:

1. calculating parameters

(1) Model dead weight (dead weight gravity acceleration g is 9.8-software self-calculation)

(2) Load condition

Table 1: tower top load working condition (force: KN moment KN.M)

(3) Parameters of the material

1) Steel Q345B

Modulus of elasticity: 2x10¹¹N/m²

Mass density: 7.8x10³kg/m³Poisson ratio: 0.3

2) Concrete C50

Modulus of elasticity: 3.45x10¹⁰N/m²

Mass density: 2.4x10³kg/m³Poisson ratio: 0.2

2. Calculation results (finite element calculation software-abaqus 6.14)

1) Original pure steel tower cylinder

Table 2: original tower drum design parameters

Table 3: calculation results (Mz working condition)

Calculating an index	mis stress	Displacement of	Frequency of
				Calculation results	192MPa (bottom)	2.53m (Top)	0.24HZ

As shown in fig. 10 and 11, which are a tower mis stress cloud chart and a tower lateral displacement cloud chart, respectively, if the wall thickness is changed, if the wall thickness is thinned, the displacement is increased, the frequency is reduced, and the frequency is reduced to be below 0.2, and the resonance is caused when the frequency is close to the tower working frequency.

2) In this embodiment 1, strength calculation after concrete pouring of a tower tube is as follows:

table 4: example 1 Tower design parameters

Table 5: calculation results (Mz working condition)

Fig. 12 and 13 are respectively a stress cloud diagram and a lateral displacement cloud diagram of the tower of the embodiment 1.

And (4) conclusion:

(1) at the same frequency, the steel usage of about 600 tons is less as seen in Table 5 versus Table 4.

(2) The novel tower scheme can effectively reduce the deformation of the lateral displacement of the tower top, and when the frequency is the same, the lateral displacement in the table 5 is 1.70, which is reduced by about 30% compared with the lateral displacement 2.53 in the table 3.

(3) The novel tower drum scheme shows that the local stress is 319MPa, belongs to a stress concentration phenomenon, is positioned at the joint part with different wall thicknesses, and can be treated by adopting a structural method of layout thickening.

(4) According to the calculation example of the novel tower barrel, an intercolumnar supporting system is not adopted, and if the intercolumnar supporting system is adopted, the stress level can be further reduced, the lateral deformation of the tower barrel is reduced, and the structural mechanical property is improved.

Claims

1. A concrete-filled steel tubular truss combined tower, including a combined tower, the combined tower is vertically assembled and formed by a plurality of sections of cylinders, and each section of the cylinder is formed by assembling a plurality of shells along the circumferential direction, and the cylinder is formed. The cross-section is circular or polygonal, and it is characterized in that the combined tower vertically connects at least three vertical steel pipes on the section of the tower as a whole, and the steel pipes take the central axis of the combined tower as the axial center. The combined tower is evenly distributed in the circumferential direction. When the steel pipe is connected to the tower, the outer steel pipe of the tower section, or the inner steel pipe of the tower section, or the radius of the tower section is larger than the inscribed circle radius of the plurality of said steel pipes and less than A plurality of the circumscribed circle radii of the steel pipes, and the steel pipes are provided with prestressed anchor cables penetrating the steel pipes from the top to the bottom.

2. The concrete-filled steel tubular truss combined tower according to claim 1, wherein the top and bottom ends of the steel pipes are respectively provided with a leveling formwork ring and a fixed bottom ring, and the two ends of the prestressed anchor cables are The connecting heads extend out of the leveling template ring and the fixed bottom ring respectively.

3. The concrete-filled steel tubular truss combined tower according to claim 1, wherein a steel skeleton is preset in the steel pipe, and the steel skeleton is composed of a plurality of longitudinal bars and surrounding longitudinal bars evenly distributed around the steel pipe axis The stirrups are formed by welding.

4 . The concrete-filled steel tubular truss combined tower according to claim 1 , wherein the prestressed anchor cable is in contact with a guide structure in the steel pipe, the guide structure is connected with the inner circumference of the steel pipe, and the steel pipe also Stiffeners are arranged locally.

5 . The CFST truss combined tower according to claim 4 , wherein the radius of the circular section of the tower is greater than the radius of the inscribed circle of the plurality of steel pipes and is smaller than the circumscribed radius of the plurality of the steel pipes. 6 . When the circle radius is used, there are at least two groups of prestressed anchor cables running through the steel pipe from top to bottom in the steel pipe. On the outside of the combined tower, the lower end of the steel pipe is inserted into the foundation to be fixed.

6. The concrete-filled steel tube truss combined tower according to claim 5, wherein the cylinder and the steel pipe are connected in the following manner:

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, and the tube shell A and the tube shell B are clamped by fasteners, or the tube shell A The side opposite to the tube shell B is welded and connected to the cylinder respectively;

Or the surface of the steel pipe is provided with a slot, and the casing is inserted into the slot and connected to the steel pipe by fasteners or welding.

7. The concrete-filled steel tubular truss combined tower according to claim 6, characterized in that, an inter-column truss support system is installed on the inner circumference of the combined tower, and the truss adopts a cross-type, or an X-type, or "the" Shape or K-type truss structure, the ends of the two ends of the truss are respectively fixed and connected to the adjacent steel pipes.

8 . The CFST truss combined tower according to claim 7 , wherein the cross-section of the steel pipe comprises a circle or a special shape, the steel pipe is in the form of constant cross-section or variable cross-section along the height direction, and the steel pipe is formed after the concrete in the pipe. The concrete column is made by prefabrication or pouring on site.

9 . The CFST truss combined tower according to claim 8 , wherein the steel pipes are connected into a whole by a multi-layer horizontal annular rib or ring beam along the vertical direction of the combined tower, and the horizontal ring beam is made of steel Beams or annular steel pipes are assembled and formed, and concrete is poured into the annular steel pipes.