Construction Method of Installation Device for Variable Cross-Section Special-Shaped Steel Tower Crown

Abstract

The present application relates to a construction method for a variable-section special-shaped steel tower crown installation device, and the construction steps of the scheme include: assembly of internal support casting formwork; construction of precise embedded brackets and I-beam rigid skeletons; assembly of standardized tire frames for precise processing of steel tower crowns; processing of steel tower crowns; installation of clamp auxiliary positioning devices; assembly of steel tower crown hoisting brackets; hoisting of steel tower crowns; construction of steel-concrete combined sections and steel tower crowns; construction of a lifting and telescopic construction platform system inside the tower crown; and internal construction of the steel tower crown. In the present application, the processing of the steel tower crown adopts a standardized tire frame, which is easy to assemble and improves the installation accuracy and construction efficiency; the hoisting of the steel tower crown adopts an internal support bottom hoisting bracket to avoid deformation of the steel tower crown during hoisting and improve the construction quality of the tower crown; the construction inside the steel tower crown adopts an adjustable construction platform system, which is convenient for disassembly and assembly, greatly improves the construction efficiency, and has broad application prospects.

Description

Technical Field

[0001] The present application relates to the field of civil engineering technology, and in particular to a construction method for installing a variable-section special-shaped steel tower crown. Background Art

[0002] Since the new century, with the rapid development of urbanization in my country, the scale of urban bridge construction has been increasing day by day. Bridges have been incorporated into the constituent elements of urban buildings. In addition to meeting basic transportation functions, they have been given more symbolic functions and cultural connotations. More and more steel structure towers are used. Large-span steel tower cable-stayed bridges with complex spatial aesthetic appeal have received widespread attention. The safety of the bridge itself and the aesthetic sensitivity to geometric appearance have put forward strict requirements on the construction accuracy of cable-stayed bridges with complex shapes.

[0003] The steel tower body is a special-shaped curved variable-section steel structure, which requires high processing accuracy. During processing and installation, it is also necessary to consider the deformation of steel components caused by temperature differences. The hoisting and splicing of steel towers at an altitude of tens of meters not only puts higher requirements on the spatial positioning and welding of steel tower blocks, but also poses challenges to the safety enclosure guarantee measures and personnel operation safety during high-altitude operations. Due to the special shape of the steel tower body, when dividing the steel tower body into hoisting units, it is necessary to consider the self-supporting nature of the steel tower column and the stress changes borne by the tower column and the tower foot under the action of wind load when each hoisting unit of the steel tower body is installed. How to reasonably divide the hoisting units, adopt technical measures to ensure the stability of the steel inclined tower during construction, and control the stress of the tower foot within a reasonable range are the difficulties of the project. The installation accuracy of the tower foot itself and the control of foundation deformation are the guarantees for the smooth implementation of the steel tower installation.

[0004] Therefore, how to achieve accurate assembly of special-shaped steel tower crowns is crucial, is the key technology for on-site construction, and is the key and difficult point in the main tower construction. Summary of the invention

[0005] The purpose of this application is to address the above-mentioned problems existing in the prior art and to provide a construction method for a variable-section special-shaped steel tower crown installation device. The steel tower crown is processed using a standardized tire frame, which is easy to assemble and improves the installation accuracy and construction efficiency; the steel tower crown is hoisted using an internal support bottom hoisting bracket to avoid deformation of the steel tower crown during hoisting and improve the construction quality; the internal construction of the steel tower crown adopts an adjustable construction platform system, which is easy to disassemble and assemble, greatly improves the construction efficiency, and has broad application prospects.

[0006] In order to achieve the above application purpose, the present application adopts the following technical solution: The construction method of the variable-section special-shaped steel tower crown installation device includes the following steps:

[0007] S00, internal support pouring formwork assembly:

[0008] Connect the diagonal rod and the diagonal rod nut for fixation, then assemble the side formwork and the chamfer formwork into a formwork, and fix the diagonal rod and the connecting rod with a connecting sleeve;

[0009] S10. Precise embedding of brackets and construction of I-beam stiffening skeletons:

[0010] Weld the clamping plate and the embedded steel plate to the embedded steel bars, place the I-beam adjusting jack on the top of the upper tower column, use a crane to place the bottom of the I-beam stiffening skeleton on the top of the embedded steel plate, and then clamp the diagonal braces of the I-beam adjusting jacks on both sides to the two sides of the I-beam stiffening skeleton;

[0011] S20. Assembly of the standardized formwork for precise processing of the steel tower crown:

[0012] Place the formwork bottom plate on a flat place, weld the column base on the formwork bottom plate, and then install the jack and the first vertical column. Horizontally install the horizontal brace and the telescopic jack on the first vertical column to preliminarily complete the assembly of the standardized formwork;

[0013] S30. Processing the steel tower crown:

[0014] Adjust the telescopic jack to move the horizontal brace to an appropriate position, hoist the tower wall and web of the steel tower crown onto the formwork bottom plate of the standardized formwork, support the inner wall of the steel tower crown with a support plate, then insert the positioning pin into the positioning hole for fixation, and carry out the construction of the transverse diaphragm of the steel tower crown;

[0015] S40. Install the auxiliary positioning device for the hoop:

[0016] Clamp the auxiliary positioning device for the hoop on the outer side of the top of the upper tower column, install the auxiliary adjusting jack on the top of the upper tower column, and support it on the inner side of the bottom of the steel tower crown through a support rod;

[0017] S50. Assembly of the hoisting bracket:

[0018] Connect the vertical rod and the bottom brace of the hoisting bracket into a whole with a fixed sleeve, and install a telescopic rod through the adjusting jack on the vertical rod to form a hoisting bracket;

[0019] S60. Hoist the steel tower crown:

[0020] Place the bottom of the steel tower crown in the clamping channel steel at both ends of the bottom brace of the hoisting bracket, top the telescopic rod against the inner wall of the steel tower crown by adjusting the adjusting jack, connect the suspension wire rope to the hoisting ear plate of the telescopic rod, and use a crane to hoist the hoisting bracket to the top of the upper tower column;

[0021] S70. Construction of the steel-concrete joint section and the steel tower crown:

[0022] Embed anchor bolts at the top of the steel-concrete composite section, weld the top of the embedded steel bars to the diaphragm at the bottom of the steel tower crown, connect the shear studs at the bottom of the steel tower crown to the steel-concrete composite section, hoist the steel tower crown to the top of the upper tower column, and use a hoop auxiliary positioning device for fine adjustment;

[0023] Connect the steel wire rope to the hoisting parts of the side formwork, adjust the jack to make the telescopic rod reach the appropriate position, and then use a crane to hoist the internal bracing formwork for pouring into the manhole at the steel-concrete composite section, and pour the concrete of the steel-concrete composite section;

[0024] S80. Construction of the lifting and telescopic construction platform system inside the tower crown:

[0025] Fix the platform bottom plate at the top of the steel-concrete composite section by using the embedded anchor bolts and fixed nuts, install the second vertical column and the lifting jacks, then install the platform top plate and the sliding platform, and install the winch on the top of the platform top plate;

[0026] S90. Construction inside the steel tower crown:

[0027] Use the pulling and sliding steel wire rope and the winch to adjust the sliding platform, so as to realize the widening and retracting of the platform top plate to meet the special construction requirements of the variable cross-section inside the steel tower crown until the construction inside the steel tower crown is completed.

[0028] Furthermore, in step S00, a diagonal rod nut is provided in the center of the inner side of the chamfer formwork. One end of the diagonal rod is provided on the side of the longitudinal connecting rod, and the other end is connected to the diagonal rod nut. A hoisting part is provided at the top of the side formwork, and a connecting rod is provided in the center of the side.

[0029] Furthermore, in step S10, the embedded steel plate is embedded at the top of the upper tower column. A clamping plate is provided at the top of the embedded steel plate. The sides of the embedded steel plate and the clamping plate are welded to the embedded steel bars by welding wires. The I-beam stiffening skeleton is located in the groove formed by the clamping plates above the embedded steel plate.

[0030] Furthermore, in steps S20 and S30, the first vertical column is located above the center of the top of the formwork bottom plate. Telescopic jacks are symmetrically provided on the side of the first vertical column. A horizontal brace is provided above the telescopic jacks. The end of the horizontal brace is welded to the support plate, and the support plate supports on the inner side of the steel tower crown.

[0031] Furthermore, in step S40, the auxiliary adjustment jack is provided at the top of the upper tower column. The support rod is connected to the auxiliary adjustment jack. The outer side of the bottom of the steel tower crown leans against the limit plate.

[0032] Furthermore, in steps S50 and S60, the vertical pole and the bottom brace of the hoisting bracket are connected as a whole through a fixed sleeve. A clamping channel steel is provided at the end of the bottom brace of the hoisting bracket. Adjusting jacks are symmetrically arranged on the side surface of the vertical pole. A telescopic rod is provided on the adjusting jack. The telescopic rod supports on the inner side surface of the steel tower crown, and a hoisting ear plate is provided at the top of the telescopic rod.

[0033] Furthermore, in step S80, a lifting jack is provided on the top of the platform bottom plate. A second vertical column is provided on the top of the lifting jack. The platform top plate is arranged on the top of the second vertical column. A reserved hole, a wire rope fixing column and a winch are provided on the top of the platform top plate. The sliding platform is arranged on the side surfaces at both ends of the platform top plate.

[0034] Furthermore, in step S80, a wire rope fixing handle is provided in the center of the side surface of the wire rope fixing column. The pulling and sliding wire rope passes through the pulley on the top of the wire rope fixing column and is tied to the wire rope fixing handle.

[0035] Furthermore, in step S80, pulleys are respectively provided above and below the inner end of the sliding platform. A traction wire rope is connected to the inner end of the sliding platform. The traction wire rope passes through the reserved hole and is connected to the winch.

[0036] Furthermore, in step S80, an ear plate is provided above the outer end of the sliding platform. The pulling and sliding wire rope is connected to the ear plate.

[0037] Working principle and beneficial effects: 1. In this application, a standardized formwork is used for the processing of the steel tower crown, which is convenient for assembly, can adapt to the processing of tower crowns with different cross-sectional sizes, and improves the installation accuracy and construction efficiency.

[0038] 2. In this application, an internal support and bottom hoisting bracket is used for the hoisting of the steel tower crown, which avoids the deformation of the steel tower crown during hoisting, improves the installation accuracy of the special-shaped steel tower crown, and improves the construction quality of the tower crown.

[0039] 3. In this application, a lifting and telescopic construction platform system is used for the construction inside the steel tower crown, which is convenient for disassembly and assembly, can adapt to the construction of variable cross-section positions inside the tower crown, and greatly improves the construction efficiency.

[0040] 4. The hanging internal support type casting formwork adopted in this application has a fast construction speed, shortens the construction period, saves labor and equipment costs, improves the installation efficiency, reduces the labor input, and can also save material waste compared with the traditional casting method, reducing the construction cost.

[0041] 5. The auxiliary positioning and adjustment device for the hoop tower column steel tower crown involved in this application ensures the splicing quality of the tower crown and the upper tower column, simplifies the construction process, shortens the construction period, can improve the installation accuracy of the tower crown, reduce costs, and improve economic benefits.

[0042] 6. The precise embedded support for the I-beam stiffening skeleton involved in this application greatly improves the installation and construction efficiency of the I-beam stiffening skeleton, ensures the construction quality, and improves the construction quality and accuracy of the tower crown. Description of the Drawings

[0043] Figure 1 is the elevation view of the tower crown structure;

[0044] Figure 2 is the plan view of the tower crown bottom plate;

[0045] Figure 3 is the installation plan view of the cross diaphragm at the bottom of the tower crown;

[0046] Figure 4 is the installation plan view of the cross diaphragm in the middle of the tower crown;

[0047] Figure 5 is the elevation view of the standardized formwork for precise processing of the steel tower crown;

[0048] Figure 6 is the elevation view of the hoisting support for the steel tower crown;

[0049] Figure 7 is the elevation view of the auxiliary positioning and adjustment device for the steel tower crown of the hoop tower column;

[0050] Figure 8 is the elevation view of the detailed structure of the auxiliary positioning and adjustment device;

[0051] Figure 9 is the elevation view of the precise embedded support for the I-beam stiffening skeleton;

[0052] Figure 10 is the elevation view of the detailed structure of the precise embedded support;

[0053] Figure 11 is the elevation view of the hanging internal bracing type casting formwork for the steel-concrete combined section;

[0054] Figure 12 is the plan view of the hanging internal bracing type casting formwork;

[0055] Figure 13 is the elevation view of the construction lifting and telescopic construction platform system inside the tower crown;

[0056] Figure 14 is the end structure diagram of the traction sliding telescopic plate;

[0057] Figure 15 is the anchoring construction drawing of the traction sliding telescopic plate;

[0058] Figure 16 is the construction flow chart of this application.

[0059] In the figure, 1 is the tower wall; 2 is the transverse diaphragm; 3 is the I-beam stiffening skeleton; 4 is the web; 5 is the embedded steel bar; 6 is the upper tower column; 7 is the steel-concrete combined section; 8 is the shear stud; 9 is the steel tower crown; 10 is the manhole; 11 is the vertical stiffening rib; 12 is the connecting plate; 13 is the transverse bracing; 14 is the first vertical column; 15 is the telescopic jack; 16 is the support plate; 17 is the positioning pin; 18 is the jack; 19 is the column base; 20 is the falsework bottom plate; 21 is the positioning hole; 22 is the clamping channel steel; 23 is the lifting ear plate; 24 is the vertical rod; 25 is the adjusting jack; 26 is the suspension wire rope; 27 is the bottom brace of the lifting bracket; 28 is the fixed sleeve; 29 is the auxiliary positioning device for the hoop; 30 is the limit plate; 31 is the support rod; 32 is the auxiliary adjusting jack; 33 is the wire rope; 34 is the internal bracing formwork for pouring; 35 is the side formwork; 36 is the lifting piece; 37 is the chamfer formwork; 38 is the diagonal rod; 39 is the connecting sleeve; 40 is the diagonal rod nut; 41 is the diagonal bracing; 42 is the I-beam adjusting jack; 43 is the clamping plate; 44 is the embedded steel plate; 45 is the welded steel wire; 46 is the second vertical column; 47 is the lifting and lowering jack; 48 is the embedded screw rod; 49 is the platform bottom plate; 50 is the fixing nut; 51 is the pulley; 52 is the traction wire rope; 53 is the winch; 54 is the platform top plate; 55 is the reserved hole; 56 is the wire rope fixing column; 57 is the wire rope fixing handle; 58 is the sliding wire rope; 59 is the sliding platform; 60 is the ear plate; 61 is the standardized falsework; 62 is the lifting bracket; 63 is the telescopic rod; 64 is the connecting rod. Specific implementation manners

[0060] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0061] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present application.

[0062] As Figures 1-16 shown, the construction method of the variable cross-section special-shaped steel tower crown installation device includes the following steps:

[0063] S00. Assembly of the internal bracing formwork 34 for pouring:

[0064] As Figure 12 shown, connect and fix the diagonal rod 38 with the diagonal rod nut 40, then assemble the side form 35 and the chamfer form 37 into a formwork, and fix the diagonal rod 38 and the connecting rod 64 with the connecting sleeve 39;

[0065] Among them, a diagonal rod nut 40 is provided at the center of the inner side of the chamfer form 37. One end of the diagonal rod 38 is provided on the side of the longitudinal connecting rod 64, and the other end is connected to the diagonal rod nut 40. A hoisting member 36 is provided at the top of the side form 35, and a connecting rod 64 is provided at the center of the side.

[0066] S10. Construction of the precise embedded support and the I-beam stiffening skeleton 3:

[0067] As Figures 9-10 shown, weld the clamping plate 43 and the embedded steel plate 44 to the embedded steel bar 5, place the I-beam adjusting jack 42 on the top of the upper tower column 6, place the bottom of the I-beam stiffening skeleton 3 on the top of the embedded steel plate 44 by using a crane, and then clamp the diagonal braces 41 of the two I-beam adjusting jacks 42 on both sides of the I-beam stiffening skeleton 3;

[0068] Among them, the embedded steel plate 44 is embedded in the top of the upper tower column 6. A clamping plate 43 is provided on the top of the embedded steel plate 44. The sides of the embedded steel plate 44 and the clamping plate 43 are welded to the embedded steel bar 5 by welding wires 45. The I-beam stiffening skeleton 3 is located in the groove formed by the clamping plate 43 above the embedded steel plate 44. The outer side of the I-beam stiffening skeleton 3 is welded to the side of the diaphragm 2 of the steel tower crown 9 by a connecting plate 12.

[0069] S20. Assembly of the standardized formwork 61 for precise machining of the steel tower crown 9:

[0070] Place the formwork bottom plate 20 on a flat place, weld the column base 19 on the formwork bottom plate 20, and then install the jack 18 and the first vertical column 14. Horizontally install the horizontal brace 13 and the telescopic jack 15 on the first vertical column 14 to initially complete the assembly of the standardized formwork 61;

[0071] S30. Machining the steel tower crown 9:

[0072] As Figure 5 shown, adjust the telescopic jack 15 to move the horizontal brace 13 to an appropriate position, hoist the tower wall 1 and the web 4 of the steel tower crown 9 onto the formwork bottom plate 20 of the standardized formwork 61, and support the inner wall of the steel tower crown 9 with the support plate 16. Then insert the positioning pin 17 into the positioning hole 21 for fixation, and carry out the construction of the diaphragm 2 of the steel tower crown 9;

[0073] Among them, the first vertical column 14 is located above the center of the top of the jig floor 20. Telescopic jacks 15 are symmetrically arranged on the side surface of the first vertical column 14. A transverse strut 13 is arranged on the telescopic jacks 15. The end of the transverse strut 13 is welded to the support plate 16, and the support plate 16 supports on the inner side surface of the steel tower crown 9. A jack 18 is arranged above the center of the top of the jig floor 20, and the jack 18 is connected to the first vertical column 14; A plurality of positioning holes 21 are arranged on both sides of the top of the jig floor 20, and the positioning pins 17 are inserted into the positioning holes 21.

[0074] Preferably, vertical stiffening ribs 11 are also arranged on the tower wall 1 at uniform intervals, and the vertical stiffening ribs 11 are welded to the transverse diaphragms 2.

[0075] S40. Install the hoop auxiliary positioning device 29:

[0076] As Figures 7-8 shown, the hoop auxiliary positioning device 29 is hooped on the outer side of the top of the upper tower column 6, the auxiliary adjustment jack 32 is installed on the top of the upper tower column 6, and is supported on the inner side surface of the bottom of the steel tower crown 9 through the support rod 31;

[0077] Among them, the auxiliary adjustment jack 32 is arranged on the top of the upper tower column 6, the support rod 31 is connected to the auxiliary adjustment jack 32, and the outer side surface of the bottom of the steel tower crown 9 leans against the limit plate 30.

[0078] S50. Assemble the hoisting bracket 62:

[0079] As Figure 6 shown, the vertical rod 24 and the hoisting bracket bottom strut 27 are connected into a whole by the fixed sleeve 28, and the telescopic rod 63 is installed through the adjustment jack 25 on the vertical rod 24 to form the hoisting bracket 62;

[0080] S60. Hoist the steel tower crown 9:

[0081] The bottom of the steel tower crown 9 is placed in the clamping channel steel 22 at both ends of the hoisting bracket bottom strut 27. The telescopic rod 63 is pushed against the inner wall of the steel tower crown 9 by adjusting the adjustment jack 25. The suspension wire rope 26 is connected to the hoisting ear plate 23 of the telescopic rod 63, and the hoisting bracket 62 is hoisted to the top of the upper tower column 6 by using a crane;

[0082] Among them, the vertical rod 24 and the hoisting bracket bottom strut 27 are connected into a whole by the fixed sleeve 28. The end of the hoisting bracket bottom strut 27 is provided with the clamping channel steel 22. The adjustment jacks 25 are symmetrically arranged on the side surface of the vertical rod 24. The telescopic rod 63 is arranged on the adjustment jacks 25. The telescopic rod 63 supports on the inner side surface of the steel tower crown 9, and the top of the telescopic rod 63 is provided with the hoisting ear plate 23.

[0083] S70. Construction of the steel-concrete combined section 7 and the steel tower crown 9:

[0084] AsFigure 11 As shown in the figure, embedded screws 48 are provided at the top of the steel-concrete combined section 7. The top of the embedded steel bars 5 is welded to the diaphragm plate 2 at the bottom of the steel tower crown 9. The shear studs 8 at the bottom of the steel tower crown 9 are connected to the steel-concrete combined section 7. The steel tower crown 9 is hoisted to the top of the upper tower column 6, and fine-tuning is carried out using the hoop auxiliary positioning device 29.

[0085] The steel wire rope 33 is connected to the lifting member 36 of the side form 35, and the adjusting jack 25 is adjusted to make the telescopic rod 63 reach a suitable position. Then, the internal bracing formwork 34 is hoisted into the manhole 10 at the steel-concrete combined section 7 using a crane, and the concrete of the steel-concrete combined section 7 is poured.

[0086] S80, Construction of the lifting and telescopic construction platform system inside the tower crown:

[0087] As Figures 13-15 shown in the figure, the platform bottom plate 49 is fixed to the top of the steel-concrete combined section 7 using the embedded screws 48 and the fixing nuts 50. The second vertical column 46 and the lifting jack 47 are installed, and then the platform top plate 54 and the sliding platform 59 are installed. The winch 53 is installed on the top of the platform top plate 54.

[0088] Among them, the lifting jack 47 is provided at the top of the platform bottom plate 49. The second vertical column 46 is provided at the top of the lifting jack 47. The platform top plate 54 is arranged at the top of the second vertical column 46. The platform top plate 54 is provided with a reserved hole 55, a steel wire rope fixing column 56 and a winch 53 at the top. The sliding platform 59 is arranged at both side ends of the platform top plate 54.

[0089] S90, Construction inside the steel tower crown 9:

[0090] The sliding platform 59 is adjusted using the pulling and sliding steel wire rope 58 and the winch 53, so as to realize the widening and retraction of the platform top plate 54 to meet the special construction requirements of the variable cross-section inside the steel tower crown 9 until the construction inside the steel tower crown 9 is completed. A steel wire rope fixing handle 57 is provided in the center on the side of the steel wire rope fixing column 56. The pulling and sliding steel wire rope 58 passes through the pulley at the top of the steel wire rope fixing column 56 and is fastened to the steel wire rope fixing handle 57. Pulleys 51 are respectively provided above and below the inner end of the sliding platform 59. A traction steel wire rope 52 is connected to the inner end of the sliding platform 59. The traction steel wire rope 52 passes through the reserved hole 55 and is connected to the winch 53. An ear plate 60 is provided above the outer end of the sliding platform 59. The pulling and sliding steel wire rope 58 is connected to the ear plate 60.

[0091] In this embodiment, the construction structure of the present application is mainly divided into the standardized formwork 61 for precise machining of the steel tower crown 9, the hoisting support 62 for the steel tower crown, the hoop auxiliary positioning device 29, the precise embedded support for the I-beam stiffening skeleton 3, the internal bracing formwork 34 and the lifting and telescopic construction platform system inside the tower crown.

[0092] The parts not detailed in this application are prior art, so they are not elaborated in this application.

[0093] It can be understood that the term "a" should be construed as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0094] Although many technical terms are used herein, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of this application; any interpretation of them as any additional limitation is contrary to the spirit of this application.

[0095] This application is not limited to the above-mentioned best mode. Any person can obtain other various forms of products under the inspiration of this application. However, no matter what changes are made in its shape or structure, as long as it has a technical solution identical or similar to this application, it falls within the protection scope of this application.

Claims

1. Construction method of variable cross-section special-shaped steel tower crown installation device, characterized in that, It includes the following steps: S00. Assembly of the internal bracing formwork (34): Connect and fix the diagonal rod (38) with the diagonal rod nut (40), then assemble the side formwork (35) and the chamfer formwork (37) into a formwork, and then fix the diagonal rod (38) and the connecting rod (64) with the connecting sleeve (39); S10. Construction of the precisely embedded support and the I-beam stiffening skeleton (3): Weld the clamping plate (43) and the embedded steel plate (44) to the embedded steel bar (5), place the I-beam adjusting jack (42) on the top of the upper tower column (6), use a crane to place the bottom of the I-beam stiffening skeleton (3) on the top of the embedded steel plate (44), and then clamp the diagonal braces (41) of the two side I-beam adjusting jacks (42) on both sides of the I-beam stiffening skeleton (3); S20. Assembly of the standardized formwork support (61) for precise processing of the steel tower crown (9): Place the formwork support bottom plate (20) on a flat place, weld the column base (19) on the formwork support bottom plate (20), and then install the jack (18) and the first vertical column (14). Horizontally install the horizontal brace (13) and the telescopic jack (15) on the first vertical column (14) to preliminarily complete the assembly of the standardized formwork support (61); S30. Processing of the steel tower crown (9): Adjust the telescopic jack (15) to move the horizontal brace (13) to an appropriate position, hoist the tower wall (1) and the web (4) of the steel tower crown (9) onto the formwork support bottom plate (20) of the standardized formwork support (61), use the support plate (16) to support the inner wall of the steel tower crown (9), and then insert the positioning pin (17) into the positioning hole (21) for fixation, and carry out the construction of the diaphragm plate (2) of the steel tower crown (9); S40. Installation of the hoop auxiliary positioning device (29): Clamp the hoop auxiliary positioning device (29) on the outer side of the top of the upper tower column (6), install the auxiliary adjusting jack (32) on the top of the upper tower column (6), and support it on the inner side of the bottom of the steel tower crown (9) through the support rod (31); S50. Assembly of the hoisting support (62): Connect the vertical rod (24) and the hoisting support bottom brace (27) into a whole with the fixed sleeve (28), and install the telescopic rod (63) through the adjusting jack (25) on the vertical rod (24) to form the hoisting support (62); S60. Hoisting of the steel tower crown (9): Place the bottom of the steel tower crown (9) in the clamping channel steel (22) at both ends of the hoisting support bottom brace (27), push the telescopic rod (63) against the inner wall of the steel tower crown (9) by adjusting the adjusting jack (25), connect the suspension wire rope (26) with the hoisting ear plate (23) of the telescopic rod (63), and use a crane to hoist the hoisting support (62) to the top of the upper tower column (6); S70. Construction of the steel-concrete composite section (7) and the steel tower crown (9): Embed anchor bolts (48) at the top of the steel-concrete composite section (7), weld the top of the embedded steel bars (5) to the diaphragm plate (2) at the bottom of the steel tower crown (9), connect the shear studs (8) at the bottom of the steel tower crown (9) to the steel-concrete composite section (7), hoist the steel tower crown (9) to the top of the upper tower column (6), and use the hoop auxiliary positioning device (29) for fine adjustment; Connect the steel wire rope (33) to the lifting member (36) of the side formwork (35), adjust the adjusting jack (25) to make the telescopic rod (63) reach the appropriate position, and then use a crane to hoist the internal bracing formwork for pouring (34) into the manhole (10) at the steel-concrete composite section (7) to pour the concrete of the steel-concrete composite section (7); S80. Construction of the lifting and telescopic construction platform system inside the tower crown: Fix the platform bottom plate (49) at the top of the steel-concrete composite section (7) by using the embedded anchor bolts (48) and fixed nuts (50), install the second vertical column (46) and the lifting jack (47), then install the platform top plate (54) and the sliding platform (59), and install the winch (53) on the top of the platform top plate (54); S90. Construction inside the steel tower crown (9): Use the pulling and sliding steel wire rope (58) and the winch (53) to adjust the sliding platform (59), so as to realize the widening and retraction of the platform top plate (54) to meet the special construction requirements of the variable cross-section inside the steel tower crown (9) until the construction inside the steel tower crown (9) is completed.

2. The construction method of the variable cross-section special-shaped steel tower crown installation device according to claim 1, characterized in that, In step S00, a diagonal rod nut (40) is provided in the center of the inner side of the chamfer formwork (37), one end of the diagonal rod (38) is provided on the side of the longitudinal connecting rod (64), and the other end is connected to the diagonal rod nut (40). The top of the side formwork (35) is provided with a lifting member (36), and a connecting rod (64) is provided in the center of the side.

3. The construction method of the variable cross-section special-shaped steel tower crown installation device according to claim 1, characterized in that In step S10, the embedded steel plate (44) is embedded at the top of the upper tower column (6). A clamping plate (43) is provided on the top of the embedded steel plate (44). The sides of the embedded steel plate (44) and the clamping plate (43) are welded to the embedded steel bars (5) by welding wires (45). The I-beam stiffening skeleton (3) is located in the groove formed by the clamping plates (43) above the embedded steel plate (44).

4. The construction method of the variable cross-section special-shaped steel tower crown installation device according to claim 1, characterized in that In steps S20 and S30, the first vertical column (14) is located above the center of the top of the falsework bottom plate (20). Telescopic jacks (15) are symmetrically arranged on the side of the first vertical column (14). A transverse strut (13) is provided on the telescopic jack (15). The end of the transverse strut (13) is welded to the support plate (16). The support plate (16) supports on the inner side of the steel tower crown (9).

5. The construction method of the variable cross-section special-shaped steel tower crown installation device according to claim 1, characterized in that, In step S40, the auxiliary adjusting jack (32) is provided on the top of the upper tower column (6). The support rod (31) is connected to the auxiliary adjusting jack (32). The outer side of the bottom of the steel tower crown (9) leans against the limit plate (30).

6. The construction method of the variable cross-section special-shaped steel tower crown installation device according to claim 1, characterized in that, In steps S50 and S60, the vertical rod (24) and the bottom brace rod (27) of the hoisting bracket are connected as a whole through a fixing sleeve (28). A clamping channel steel (22) is provided at the end of the bottom brace rod (27) of the hoisting bracket. Adjusting jacks (25) are symmetrically provided on the side surface of the vertical rod (24). A telescopic rod (63) is provided on the adjusting jack (25). The telescopic rod (63) supports on the inner side surface of the steel tower crown (9). A hoisting ear plate (23) is provided at the top of the telescopic rod (63).

7. The construction method of the variable cross-section special-shaped steel tower crown installation device according to any one of claims 1-6, characterized in that In step S80, a lifting jack (47) is provided at the top of the platform bottom plate (49). A second vertical column (46) is provided at the top of the lifting jack (47). The platform top plate (54) is arranged at the top of the second vertical column (46). A reserved hole (55), a wire rope fixing column (56) and a winch (53) are provided at the top of the platform top plate (54). The sliding platform (59) is arranged at both side surfaces at the two ends of the platform top plate (54).

8. The construction method of the variable cross-section special-shaped steel tower crown installation device according to claim 7, characterized in that, In step S80, a wire rope fixing handle (57) is provided at the center of the side surface of the wire rope fixing column (56). The pulling and sliding wire rope (58) is tied to the wire rope fixing handle (57) after passing through the pulley at the top of the wire rope fixing column (56).

9. The construction method of the variable cross-section special-shaped steel tower crown installation device according to claim 8, characterized in that, In step S80, pulleys (51) are respectively provided above and below the inner end of the sliding platform (59). A traction wire rope (52) is connected to the inner end of the sliding platform (59). The traction wire rope (52) passes through the reserved hole (55) and is connected to the winch (53).

10. The construction method of the variable cross-section special-shaped steel tower crown installation device according to claim 9, characterized in that, In step S80, an ear plate (60) is provided above the outer end of the sliding platform (59). The pulling and sliding wire rope (58) is connected to the ear plate (60).

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