Large-span main tower bent frame combined steel pipe cross brace and main tower construction process

Abstract

The invention relates to the technical field of bridge construction, in particular to a large-span main tower bent frame combined type steel pipe cross brace and a main tower construction technology. The large-span main tower bent frame combined type steel pipe cross brace comprises two pre-buried supports which are pre-buried in two vertical sections of a main tower respectively; the two supporting steel pipes are located between the two vertical sections of the main tower, and the two ends of the two supporting steel pipes are connected with the two embedded supports correspondingly; the two reinforcing bent frames are respectively connected with the two supporting steel pipes; and the reinforcing rod is connected between the two supporting steel pipes. According to the large-span main tower bent frame combined type steel pipe cross brace, the overall strength of the cross brace is improved in the mode that the reinforcing bent frames are combined with the supporting steel pipes, cost and construction difficulty are greatly reduced on the premise that safety and reliability are guaranteed, and meanwhile the scheme is high in universality and construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a large-span main tower frame combined steel pipe cross brace and a main tower construction process. Background Art

[0002] For inclined tower columns, before and after the construction of the cable tower crossbeam, due to the influence of the self-weight of the free cantilever section of the inclined tower column, the tension of the prestressed steel strands of the crossbeam, the self-weight of the crossbeam, the deformation of the bracket and other factors, tension will be generated on the outer sides of the upstream and downstream tower columns, thereby causing the upstream and downstream tower columns to shift inward. Therefore, during the construction of the tower column, the strength and deformation of the tower column at each construction stage should be verified, and active cross braces should be set at different heights to make its deformation, internal force and inclination meet the design requirements and ensure the safety of the construction structure.

[0003] The position of the active cross brace and its top bracing force are determined based on the principle of ensuring that the additional stress formed on the tower column due to its own weight and construction load during the tower column construction process is not greater than the design requirements.

[0004] After the position of the active cross brace is determined, the size of the top bracing force becomes the key to controlling the concrete stress during the construction process. If it is too small, the expected effect will not be achieved, and if it is too large, the overall line shape of the tower body will be affected. To this end, it is necessary to control both stress and deformation, ensuring the line shape while satisfying the stress of each section of the tower column. The internal force of the tower under the ideal state provided by the design unit is used as a reference to ensure that the internal force of the tower column after the completion of the cable tower is as close as possible. Calculate the horizontal displacement generated at each node in each construction stage, and at the same time calculate the horizontal displacement generated at each node of the tower column after the cross braces are removed after the cable tower construction is completed. The sum of the above horizontal displacements is used as the horizontal displacement adjustment value (pre-bias) of the tower column at each stage of construction, so that the line shape of the tower column meets the design requirements.

[0005] The top support force should be applied immediately after the horizontal cross brace is installed. While applying the top support force, the deflection of the horizontal cross brace and the deformation of the tower column should be observed, and the theoretical calculation should be verified based on the measured values.

[0006] The existing scheme generally directly uses steel pipes and connectors as cross braces. However, for wide tower columns with more than six lanes in both directions such as suspension bridges and cable-stayed bridges, the material performance, diameter, weight, etc. must be larger, and the tower crane investment in the project must be better; or multiple temporary cross braces are used, which brings great inconvenience to construction arrangements and safety management. Summary of the invention

[0007] The technical problem to be solved by the present invention is: in order to solve the technical problems in the prior art, the present invention provides a large-span main tower frame combined steel pipe cross brace and a main tower construction process.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a large-span main tower frame combined steel pipe cross brace, including two embedded brackets, which are respectively embedded in the two vertical sections of the main tower; two supporting steel pipes, which are both located between the two vertical sections of the main tower, and the two ends of the two supporting steel pipes are respectively connected to the two embedded brackets; two reinforcing frames are provided, which are respectively connected to the two supporting steel pipes; and a reinforcement rod is connected between the two supporting steel pipes.

[0009] The large-span main tower frame combined steel pipe cross brace of the present invention improves the overall strength of the cross brace by strengthening the combination of the frame and the supporting steel pipe, thereby greatly reducing the cost and construction difficulty while ensuring safety and reliability.

[0010] Furthermore, the supporting steel pipe includes a middle steel pipe and two reinforcing steel pipes, the two reinforcing steel pipes are respectively sleeved on both ends of the middle steel pipe, the reinforcing steel pipe is fixedly connected to the middle steel pipe, and the opposite ends of the two reinforcing steel pipes are respectively fixedly connected to two embedded brackets.

[0011] Furthermore, the reinforcing frame is fixedly connected to the middle steel pipe and the reinforcing steel pipe at the same time.

[0012] Furthermore, an inclined reinforcing rod is connected to the reinforcing steel pipe, and the other end of the inclined reinforcing rod is connected to the middle steel pipe of another supporting steel pipe.

[0013] Furthermore, the reinforced frame includes a reinforcing cross bar, a first reinforcing diagonal bar and a second reinforcing diagonal bar. The reinforcing cross bar is arranged parallel to the supporting steel pipe. One end of the first reinforcing diagonal bar is connected to the supporting steel pipe, and the other end is connected to the reinforcing cross bar. One end of the second reinforcing diagonal bar is connected to the supporting steel pipe, and the other end is connected to the reinforcing cross bar. The first reinforcing diagonal bar, the second reinforcing diagonal bar and the supporting steel pipe support form a triangle.

[0014] Furthermore, a plurality of the first reinforcing diagonal bars and the second reinforcing diagonal bars are arrayed along the length direction of the reinforcing cross bar, so that a triangle is formed between each group of the first reinforcing diagonal bars and the second reinforcing diagonal bars.

[0015] Furthermore, the middle steel pipe and the side wall of a reinforced steel pipe are fixedly connected with a same reinforced vertical side, and the reinforced vertical side is arranged opposite to the reinforced frame.

[0016] Furthermore, a reinforced horizontal edge is fixedly connected to the reinforced vertical edge.

[0017] Furthermore, a triangular reinforcement plate is fixedly connected to the side wall of the reinforced vertical edge, and a plurality of the triangular reinforcement plates are provided, some of the triangular reinforcement plates are fixedly connected to the middle steel pipe, and some of the triangular reinforcement plates are fixedly connected to the reinforcing steel pipe.

[0018] A main tower construction process comprises the following steps: S1. Construct two vertical bottom sections of the main tower and construct the lower cross beam between the two vertical bottom sections; S2, constructing the vertical section of the main tower by climbing formwork, and constructing a temporary cross brace between two vertical sections after each climbing formwork construction, wherein the temporary cross brace adopts the above-mentioned large-span main tower bent frame combined steel pipe cross brace; S3. During the construction of the vertical section, embedded parts are set on the side walls of the two vertical sections; S4, hoisting the first supporting bracket and the second supporting bracket respectively, and connecting them to the embedded parts on the two vertical sections respectively; S5, hoisting the intermediate bracket so that the intermediate bracket is located between the first supporting bracket and the second supporting bracket, and the intermediate bracket is connected to the first supporting bracket and the second supporting bracket; S6, hoisting the first stable bracket and the second stable bracket, so that the first stable bracket is connected to the first supporting bracket, so that the second stable bracket is connected to the second supporting bracket, hoisting the third stable bracket, and so that the third stable bracket is connected to the first stable bracket and the second stable bracket, and at the same time connecting the third stable bracket to the first supporting bracket, the second supporting bracket, and the intermediate bracket; S7. Install the sand box, distribution beam, Bailey beam, wooden square and bottom mold on the first stable support and the second stable support, then install the side mold on the bottom mold, and cast the upper beam through the bottom mold and the side mold.

[0019] The beneficial effects of the present invention are: 1. By strengthening the combination of the rack and the supporting steel pipe, the overall strength of the cross brace is improved, which greatly reduces the cost and construction difficulty while ensuring safety and reliability; 2. Through the arrangement of the middle steel pipe and the reinforcing steel pipe, the middle steel pipe can be the cross brace used for the construction of other narrow tower columns. On the basis of the middle steel pipe, the reinforcing steel pipe can be added to adapt to the occasions of wide tower columns. At the same time, if it is needed in other occasions, the middle steel pipe and the reinforcing steel pipe can still be separated or adjusted to reduce the construction cost; 3. Form a plurality of continuous triangles through the first reinforcing diagonal rod and the second reinforcing diagonal rod to strengthen the supporting steel pipe, especially to improve the tensile or compressive performance of the supporting steel pipe; 4. By strengthening the arrangement of the racks and the vertical sides, the vertical sides can realize the fixed connection between the middle steel pipe and the reinforcing steel pipe on the one hand, and can cooperate with the strengthening racks on the other hand to jointly improve the overall strength of the cross brace. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1It is a front view schematic diagram of a large-span main tower frame combined steel pipe cross bracing integral structure in the present invention.

[0022] Figure 2 It is a top view schematic diagram of a large-span main tower frame combined steel pipe cross brace overall structure in the present invention.

[0023] Figure 3 yes Figure 1 A partial enlarged view of part A in the middle.

[0024] Figure 4 yes Figure 1 A partial enlarged view of part B in the middle.

[0025] Figure 5 It is a schematic diagram of the invention showing the reinforced vertical side and the reinforced horizontal side.

[0026] Figure 6 It is a schematic diagram showing the vertical bottom section after construction in the present invention.

[0027] Figure 7 It is a schematic diagram showing the lower cross beam and the first temporary cross brace after construction in the present invention.

[0028] Figure 8 It is a schematic diagram showing the construction of three temporary cross braces in the present invention.

[0029] Fig. 9 It is a schematic diagram showing the upper crossbeam after construction in the present invention.

[0030] Fig.10 It is a schematic flow chart of a construction method embodied in the present invention.

[0031] Fig.11 It is a schematic diagram of the entire upper crossbeam support in the present invention.

[0032] Fig.12 It is a schematic diagram of the first supporting bracket and the intermediate bracket in the present invention.

[0033] Fig.13 It is a schematic diagram of the distribution beam, Bailey beam and bottom mold in the present invention.

[0034] In the figure: 1, vertical bottom section; 11, lower crossbeam; 12, upper crossbeam; 2, vertical section; 21, first embedded part; 22, second embedded part; 23, third embedded part; 3, first supporting bracket; 31, first diagonal rod; 32, second diagonal rod; 33, third diagonal rod; 34, fourth diagonal rod; 35, first vertical rod; 36, first crossbar; 37, second crossbar; 4, second supporting bracket; 5, middle bracket; 51, third crossbar; 52, fourth crossbar; 53, second vertical rod; 54, third vertical rod; 55, fourth vertical rod; 56, fifth vertical rod; 57, fifth diagonal rod; 58, sixth diagonal rod; 6, first stable bracket Fixed bracket; 61, second stable bracket; 62, third stable bracket; 63, first distribution beam; 64, second distribution beam; 65, Bailey beam; 66, wooden square; 67, bottom formwork; 68, guardrail; 7, temporary cross brace; 71, embedded bracket; 72, supporting steel pipe; 721, middle steel pipe; 7211, reinforcement ring; 7212, triangular rib; 722, reinforcement steel pipe; 723, reinforcement vertical side; 724, reinforcement horizontal side; 725, triangular reinforcement plate; 73, reinforcement rack; 731, reinforcement cross bar; 732, first reinforcement diagonal bar; 733, second reinforcement diagonal bar; 74, reinforcement bar; 75, inclined reinforcement bar. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships described in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a communication between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The invention discloses a large-span main tower frame combined steel pipe cross brace and a main tower construction process.

[0038] Reference Figures 1 to 5 A large-span main tower bent frame combined steel pipe cross brace includes a pre-embedded bracket 71, and two pre-embedded brackets 71 are provided, which are respectively pre-embedded in two vertical sections 2 of the main tower. Two supporting steel pipes 72 are welded between the two pre-embedded brackets 71, and the two supporting steel pipes 72 are located between the two vertical sections 2 of the main tower. Each supporting steel pipe 72 is also connected to a reinforced bent frame 73, and a plurality of reinforcing rods 74 are connected between the two supporting steel pipes 72. By combining the reinforcing bent frame 73, the reinforcing rod 74 and the supporting steel pipe 72, the overall strength of the cross brace is improved, and the cost and construction difficulty are greatly reduced under the premise of ensuring safety and reliability.

[0039] Specifically, the supporting steel pipe 72 includes a middle steel pipe 721 and two reinforcing steel pipes 722. The two reinforcing steel pipes 722 are respectively sleeved on both ends of the middle steel pipe 721. The reinforcing steel pipes 722 are fixedly connected to the middle steel pipe 721. The opposite ends of the two reinforcing steel pipes 722 are respectively welded to the two embedded brackets 71. A reinforcing ring 7211 is welded to the middle steel pipe 721, and a triangular rib 7212 is welded between the reinforcing ring 7211 and the middle steel pipe 721.

[0040] More specifically, the side walls of the middle steel tube 721 and the one reinforcing steel tube 722 are fixedly connected with the same reinforcing vertical edge 723 .

[0041] A reinforcing horizontal side 724 is fixedly connected to the reinforcing vertical side 723. A triangular reinforcing plate 725 is welded to the side wall of the reinforcing vertical side 723. A plurality of triangular reinforcing plates 725 are provided, some of which are welded to the middle steel pipe 721, and some of which are welded to the reinforcing steel pipe 722. An inclined reinforcing rod 75 is connected to the reinforcing steel pipe 722, and the other end of the inclined reinforcing rod 75 is connected to the middle steel pipe 721 of another supporting steel pipe 72, so as to increase the reliability of the connection between the middle steel pipe 721 and the reinforcing steel pipe 722.

[0042] The reinforcement rack 73 is fixedly connected to the middle steel pipe 721 and the reinforcement steel pipe 722. The reinforcement rack 73 includes a reinforcement cross bar 731, a first reinforcement diagonal bar 732 and a second reinforcement diagonal bar 733. The reinforcement cross bar 731 is arranged parallel to the support steel pipe 72. One end of the first reinforcement diagonal bar 732 is connected to the support steel pipe 72, and the other end is connected to the reinforcement cross bar 731. One end of the second reinforcement diagonal bar 733 is connected to the support steel pipe 72, and the other end is connected to the reinforcement cross bar 731. The first reinforcement diagonal bar 732, the second reinforcement diagonal bar 733 and the support steel pipe 72 support to form a triangle.

[0043] It should be noted that there are multiple first reinforcing diagonal rods 732 and second reinforcing diagonal rods 733 arrayed along the length direction of the reinforcing cross bar 731, so that a triangle is formed between each group of first reinforcing diagonal rods 732 and second reinforcing diagonal rods 733, that is, a triangle is also formed between the second reinforcing diagonal rods 733, the reinforcing cross bar 731 and the adjacent group of first reinforcing diagonal rods 732.

[0044] A main tower construction process, referring to Figures 6 to 12 , including the following steps: S1, construct two vertical bottom sections 1 of the main tower, and construct the lower cross beam 11 between the two vertical bottom sections 1; S2, construct the vertical section 2 of the main tower by climbing formwork, and after each climbing formwork construction, construct a temporary cross brace 7 between the two vertical sections 2, the temporary cross brace 7 adopts the above-mentioned large-span main tower bent frame combined steel pipe cross brace; S3. During the construction of the vertical section 2, embedded parts are arranged on the side walls of the two vertical sections 2; S4, hoisting the first supporting bracket 3 and the second supporting bracket respectively, and connecting them to the embedded parts on the two vertical sections 2 respectively; S5, hoisting the intermediate bracket 5, so that the intermediate bracket 5 is located between the first supporting bracket 3 and the second supporting bracket 4, and the intermediate bracket 5 is connected to the first supporting bracket 3 and the second supporting bracket 4; S6, hoist the first stable bracket 6 and the second stable bracket 61, so that the first stable bracket 6 is connected to the first supporting bracket 3, and the second stable bracket 61 is connected to the second supporting bracket 4, hoist the third stable bracket 62, and connect the third stable bracket 62 to the first stable bracket 6 and the second stable bracket 61, and at the same time connect the third stable bracket 62 to the first supporting bracket 3, the second supporting bracket 4, and the intermediate bracket 5; S7, installing the distribution beam, Bailey beam 65, wooden square 66 and bottom mold 67 on the first stable support 6 and the second stable support 61, then installing the side mold on the bottom mold 67, and casting the upper cross beam 12 through the bottom mold 67 and the side mold.

[0045] Reference Figures 11 to 13 Specifically, the embedded parts include a first embedded part 21, a second embedded part 22 and a third embedded part 23. The first embedded part 21 is installed on both vertical sections 2. The first embedded part 21 on one vertical section 2 is fixedly connected to the first stable bracket 6, and the first embedded part 21 on the other vertical section 2 is fixedly connected to the second stable bracket 61. The third stable bracket 62 is fixedly connected between the first stable bracket 6 and the second stable bracket 61, and is flush with the first stable bracket 6 and the second stable bracket 61. The first embedded part 21, the second embedded part 22 and the third embedded part 23 can all adopt brackets.

[0046] The first supporting bracket 3 includes a first oblique rod 31, a second oblique rod 32, a third oblique rod 33, a fourth oblique rod 34, a first vertical rod 35, a first cross rod 36 and a second cross rod 37; one end of the first oblique rod 31 is hinged to the second embedded part 22, and the other end is hinged to the first stable bracket 6; one end of the second oblique rod 32 is hinged to the third embedded part 23, and the other end is hinged to the third stable bracket 62. One end of the third oblique rod 33, the fourth oblique rod 34, the first cross rod 36, the second cross rod 37 and the first vertical rod 35 is hinged to the first oblique rod 31, and the other end is hinged to the second oblique rod 32.

[0047] Among them, the first vertical rod 35, the first cross rod 36 and the second diagonal rod 32 form a triangle, the first cross rod 36, the third diagonal rod 33 and the first diagonal rod 31 form a triangle, the third diagonal rod 33, the second diagonal rod 32 and the second cross rod 37 form a triangle, and the second cross rod 37, the fourth diagonal rod 34 and the first diagonal rod 31 form a triangle to ensure the overall stability of the first supporting bracket 3.

[0048] In addition, the structure of the second support bracket 4 is mirrored to the structure of the first support bracket 3 along the midpoint of the line connecting the two vertical sections 2. That is, the structure of the second support bracket 4 is the same as that of the first support bracket 3, but is symmetrically arranged.

[0049] More specifically, the intermediate bracket 5 includes a third crossbar 51, a fourth crossbar 52, a second vertical bar 53, a third vertical bar 54, a fourth vertical bar 55 and a fifth vertical bar 56. Both ends of the third crossbar 51 are connected to the two second crossbars 37, and both ends of the fourth crossbar 52 are connected to the two second oblique bars 32. One end of the second vertical bar 53 and the fifth vertical bar 56 are connected to the third crossbar 51, and the other end is connected to the fourth crossbar 52. One end of the third vertical bar 54 and the fourth vertical bar 55 are connected to the third stable bracket 62, and the other end is connected to the fourth crossbar 52.

[0050] The third cross bar 51 is fixedly connected to a fifth diagonal bar 57 and a sixth diagonal bar 58 . The fifth diagonal bar 57 and the second diagonal bar 32 are both connected to the third stabilizing bracket 62 .

[0051] It should be noted that the first supporting bracket 3, the second supporting bracket 4, the first stable bracket 6 and the second stable bracket 61 are connected to the embedded parts through the ear plate seats. During hoisting, the ear plate seats are first hinged with the first supporting bracket 3, the second supporting bracket 4, the first stable bracket 6 or the second stable bracket 61 through the pin shaft, and then the ear plate seats are welded to the embedded parts, which can reduce the number of procedures for high-altitude construction and reduce safety hazards.

[0052] When the first support bracket 3 is lifted by the tower crane hook to the vicinity of the embedded part, the first support bracket 3 is temporarily connected to the embedded part through the guide chain, and when the guide chain is stabilized, the tower crane is unhooked. The temporary connection is achieved through the guide chain, which facilitates the tower crane hook to lift other brackets and improves construction efficiency.

[0053] The distribution beam includes a first distribution beam 63 and a second distribution beam 64. The first distribution beam 63 is installed on the first stable bracket 6, the second stable bracket 61 and the third stable bracket 62. The Bailey beam 65 is installed on the first distribution beam 63. The second distribution beam 64 is installed on the Bailey beam 65. The wood 66 is installed on the second distribution beam 64. The bottom mold 67 is installed on the wood 66. At the same time, a guardrail 68 is arranged around the bottom mold 67.

[0054] Working principle: The first support bracket 3, the second support bracket 4, the intermediate bracket 5, the first stable bracket 6, the second stable bracket 61 and the third stable bracket 62 are connected to form a whole to better bear the force. At the same time, there are many hinges inside the first support bracket 3 and the second support bracket 4, which can better release the bending moment to improve the bearing capacity. Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A large-span main tower frame combined steel pipe cross brace, characterized in that: include Two pre-embedded brackets (71) are provided and are respectively pre-embedded in two vertical sections (2) of the main tower; Two supporting steel pipes (72) are provided and are both located between the two vertical sections (2) of the main tower, and both ends of the two supporting steel pipes (72) are respectively connected to the two embedded brackets (71); Two reinforcing bent frames (73) are provided and are respectively connected to two supporting steel pipes (72); A reinforcing rod (74) is connected between the two supporting steel pipes (72).

2. The large-span main tower bent frame combined steel pipe cross brace according to claim 1, characterized in that: The supporting steel pipe (72) comprises a middle steel pipe (721) and two reinforcing steel pipes (722). The two reinforcing steel pipes (722) are respectively sleeved on both ends of the middle steel pipe (721). The reinforcing steel pipe (722) is fixedly connected to the middle steel pipe (721). The opposite ends of the two reinforcing steel pipes (722) are respectively fixedly connected to the two embedded brackets (71).

3. The large-span main tower bent frame combined steel pipe cross brace according to claim 2, characterized in that: The reinforcing bent frame (73) is fixedly connected to the middle steel pipe (721) and the reinforcing steel pipe (722) at the same time.

4. The large-span main tower bent frame combined steel pipe cross brace according to claim 3, characterized in that: The reinforcing steel pipe (722) is connected to an inclined reinforcing rod (75), and the other end of the inclined reinforcing rod (75) is connected to a middle steel pipe (721) of another supporting steel pipe (72).

5. The large-span main tower bent frame combined steel pipe cross brace as claimed in claim 1, characterized in that: The reinforcing frame (73) comprises a reinforcing cross bar (731), a first reinforcing diagonal bar (732) and a second reinforcing diagonal bar (733); the reinforcing cross bar (731) is arranged parallel to the supporting steel pipe (72); one end of the first reinforcing diagonal bar (732) is connected to the supporting steel pipe (72), and the other end is connected to the reinforcing cross bar (731); one end of the second reinforcing diagonal bar (733) is connected to the supporting steel pipe (72), and the other end is connected to the reinforcing cross bar (731); the first reinforcing diagonal bar (732), the second reinforcing diagonal bar (733) and the supporting steel pipe (72) support to form a triangle.

6. A large-span main tower bent frame combined steel pipe cross brace as claimed in claim 5, characterized in that: A plurality of the first reinforcing oblique bars (732) and the second reinforcing oblique bars (733) are arrayed along the length direction of the reinforcing cross bar (731), so that a triangle is formed between each group of the first reinforcing oblique bars (732) and the second reinforcing oblique bars (733).

7. The large-span main tower bent frame combined steel pipe cross brace as claimed in claim 2, characterized in that: The side walls of the middle steel tube (721) and a reinforcing steel tube (722) are fixedly connected with a same reinforcing vertical edge (723), and the reinforcing vertical edge (723) is arranged opposite to the reinforcing bent frame (73).

8. The large-span main tower bent frame combined steel pipe cross brace as claimed in claim 7, characterized in that: The reinforced vertical edge (723) is fixedly connected to a reinforced horizontal edge (724).

9. The large-span main tower bent frame combined steel pipe cross brace as claimed in claim 7, characterized in that: A triangular reinforcing plate (725) is fixedly connected to the side wall of the reinforcing vertical side (723), and a plurality of the triangular reinforcing plates (725) are provided, some of the triangular reinforcing plates (725) are fixedly connected to the middle steel pipe (721), and some of the triangular reinforcing plates (725) are fixedly connected to the reinforcing steel pipe (722).

10. A main tower construction process, characterized in that: The steps include: S1, constructing two vertical bottom sections (1) of the main tower, and constructing a lower cross beam (11) between the two vertical bottom sections (1); S2. The vertical section (2) of the main tower is constructed by climbing formwork, and after each climbing formwork construction, a temporary cross brace (7) is constructed between two vertical sections (2), wherein the temporary cross brace (7) is a large-span main tower bent frame combined steel pipe cross brace as described in any one of claims 1 to 9 above; S3. During the construction of the vertical section (2), embedded parts are arranged on the side walls of the two vertical sections (2); S4, hoisting the first supporting bracket (3) and the second supporting bracket respectively, and connecting them to the embedded parts on the two vertical sections (2) respectively; S5, hoisting the intermediate bracket (5) so that the intermediate bracket (5) is located between the first supporting bracket (3) and the second supporting bracket (4), and the intermediate bracket (5) is connected to the first supporting bracket (3) and the second supporting bracket (4); S6, hoisting the first stable bracket (6) and the second stable bracket (61), so that the first stable bracket (6) is connected to the first supporting bracket (3), so that the second stable bracket (61) is connected to the second supporting bracket (4), hoisting the third stable bracket (62), and so that the third stable bracket (62) is connected to the first stable bracket (6) and the second stable bracket (61), and at the same time, the third stable bracket (62) is connected to the first supporting bracket (3), the second supporting bracket (4), and the intermediate bracket (5); S7. Install the sand box, distribution beam, Bailey beam (65), wooden square (66) and bottom mold (67) on the first stable support (6) and the second stable support (61), then install the side mold on the bottom mold (67), and cast the upper beam (12) through the bottom mold (67) and the side mold.

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