Hoisting method for large-span steel structure reticulated shell roof

Abstract

The present application relates to a kind of hoisting methods of large-span steel structure reticulated shell roof, comprising the following steps: steel column in the middle of site hoisting;Single hoist rotating device hoisting on peripheral column;Guide auxiliary ring frame is made and installed;Center annular net shell is made;Center annular net shell hoisting bolt connection is fixed;Radial main beam hoisting bolt connection is fixed;Arc net shell unit hoisting bolt connection is fixed;Hoisting net shell welding is fixed;The most central circular net shell is made and hoisted and welded;Finally, a reserved arc net shell unit is made and hoisted and welded.The beneficial effects of the present application are: hoisting net shell structure by winch, reducing the use of crawler crane and other large machines, greatly reducing the risk during construction.The rotating shaft and sliding winch are installed on the central steel column and the peripheral column, which can improve the flexibility of hoisting the net shell structure.The upper, middle and lower units of the central steel column and the large and small arms are detachable and reusable, avoiding the waste of large machines.

Description

Technical Field

[0001] This invention belongs to the field of hoisting of grid shell structures, and particularly relates to a hoisting method for a large-span steel grid shell roof. Background Technology

[0002] Grid shell structures are attracting increasing attention and have broad development prospects. Large-span grid shell structures are widely used in large buildings such as stadiums. During the construction of large-span steel grid shell roofs, large machinery such as aerial work platforms and tower cranes are mostly used for hoisting and securing. However, in urban construction, the excessive use of large machinery can have varying degrees of impact on surrounding residents and the environment.

[0003] To address the above issues, there is an urgent need for a hoisting method for large-span steel grid roof structures to reduce the use of large machinery and equipment, minimize the impact on surrounding residents during construction, reduce construction risks, and achieve accurate hoisting and fixing of the grid structure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hoisting method for a large-span steel structure grid shell roof.

[0005] The hoisting method for this type of large-span steel grid roof includes the following construction steps:

[0006] Step 1: The lower unit of the central steel column has vertically sliding sliders around it. The middle unit of the central steel column is equipped with four fixed winches. The upper unit of the central steel column is equipped with a rotating device and two booms. Each boom is equipped with a sliding winch.

[0007] Step 2: Install a rotating device and a boom on the top of the surrounding columns, and slide a sliding winch on the boom to form a single-lift rotating device;

[0008] Step 3: Fix the four guide auxiliary arcs onto the slider and connect them to form a guide auxiliary ring;

[0009] Step 4: The central annular mesh shell is spliced ​​on the guide auxiliary ring frame, the hoisting slider is fixed, and a brake plate is set below the central annular mesh shell to support it.

[0010] Step 5: Using the sliding winches on the central steel column unit and the peripheral columns, the radial main beam is hoisted between the central annular mesh shell and the peripheral columns; and the arc mesh shell unit and the innermost circular mesh shell are hoisted.

[0011] Preferably, the central steel column is formed by hoisting the lower unit, middle unit, and upper unit of the central steel column. The lower unit of the central steel column is provided with vertical slide rails along its height. A slider is provided in the vertical slide rail, and a lifting lug is welded on the slider. The slider moves in the vertical slide rail via pulleys. At the end of the four vertical slide rails in the middle unit of the central steel column, there are four small arms. A fixed winch is installed on each small arm. Brake plate pre-drilling holes are reserved in the middle unit of the central steel column and the vertical slide rails. A rotating device is installed on the top of the upper unit of the central steel column. Large arms are symmetrically installed on the rotating shaft of the rotating device. Winch slide rails and two sliding winches are installed on each large arm. The sliding winches move horizontally on the large arm.

[0012] Preferably, the central annular mesh shell is divided into two parts and spliced ​​on the guide auxiliary ring frame of the central steel column. The central annular mesh shell is bolted to the guide auxiliary ring frame and the two parts of the central annular mesh shell are welded together. The hook of the fixed winch on the central steel column unit hooks the movable slider in the vertical slide rail. The four fixed winches start working, and the central annular mesh shell is lifted up along the vertical slide rail to the designated position. The brake plate is inserted into the brake plate pre-drilled hole and bolted to the slider and the vertical slide rail through the bolt pre-drilled hole to achieve braking. An inclined rib is set in the brake plate. The fixed winch of the central steel column unit is unloaded, and the central annular mesh shell is placed on the brake plate. The fixed winch and boom of the central steel column unit are disassembled using a crawler crane.

[0013] Preferably, corbels are installed on the peripheral columns with pre-installed anchor bolts. Based on the spatial position of the central annular mesh shell and the corbels on the peripheral columns, radial main beams are fabricated. The sliding winches installed on the outer side of the central steel column and on the peripheral columns are respectively used to hoist both ends of the radial main beams. The sliding winches are used for symmetrical hoisting. After the radial main beams are hoisted to the designated positions, one end of the radial main beam is bolted to the central annular mesh shell with transverse bolts, and the other end is bolted to the pre-installed anchor bolts on the corbels of the peripheral columns. All radial main beams are bolted to the central annular mesh shell and the corbels of the peripheral columns in sequence.

[0014] Preferably, the arc-shaped shell unit includes an inner arc-shaped shell unit, a middle arc-shaped shell unit, and an outer arc-shaped shell unit. The inner arc-shaped shell unit is hoisted symmetrically using sliding winches on the two booms of the unit on the central steel column. The middle arc-shaped shell unit is hoisted symmetrically using sliding winches on the outer side of the boom of the unit on the central steel column and sliding winches on the peripheral columns. The outer arc-shaped shell unit is hoisted symmetrically using sliding winches on the rotating devices of two adjacent peripheral columns.

[0015] As a preferred option, a set of hoisting spaces for the inner arc shell unit, middle arc shell unit, and outer arc shell unit is reserved as a crawler crane operating area. That is, the arc shell unit in this area is not installed first. After the hoisting of all arc shell units in other areas is completed, the most central circular shell is hoisted by the crawler crane. Then, the upper unit and middle unit of the central steel column are dismantled by the crawler crane, and the single hoisting rotation device on the surrounding columns is removed. Finally, the hoisted radial main beam, arc shell unit, and most central circular shell are welded together.

[0016] As a preferred option, after completing the welding of the radial main beam, arc-shaped mesh shell unit, and the innermost circular mesh shell that have been hoisted outside the crawler crane's operating area, the arc-shaped mesh shell unit in the crawler crane's operating area is hoisted and welded: the arc-shaped mesh shell unit is hoisted and welded from the inside out using a crawler crane and an aerial work platform. The remaining set of inner arc-shaped mesh shell units, middle arc-shaped mesh shell units, and outer arc-shaped mesh shell units are hoisted and welded in sequence, while the crawler crane is moved outwards simultaneously. After all the arc-shaped mesh shell units are welded, the guide auxiliary ring, vertical slide rail, and lower unit of the central steel column are removed in sequence.

[0017] A large-span steel structure grid roof, obtained by any of the methods described above.

[0018] The beneficial effects of this invention are:

[0019] 1) In the hoisting of large-span steel structure grid roofs, compared with the traditional method of hoisting construction using crawler cranes throughout the entire process, this invention mostly adopts winches to hoist the grid structure, reducing the use of large machines such as crawler cranes and greatly reducing the risks during construction; rotating devices and sliding winches are installed on the central steel columns and peripheral columns, which can improve the flexibility of hoisting the grid structure.

[0020] 2) When welding the reticulated shell unit, the present invention divides the reticulated shell unit into an inner arc reticulated shell unit, a middle arc reticulated shell unit, and an outer arc reticulated shell unit, and manufactures and welds them in sequence. This minimizes the stress and strain that occurs during welding of the reticulated shell structure, and also avoids the problem of reprocessing and modifying the members later due to welding errors.

[0021] 3) In this invention, the hoisting unit of the central steel column, the lower unit of the central steel column, the middle unit of the central steel column, the upper unit of the central steel column, as well as the boom and arm, are detachable and reusable, thus avoiding the waste of resources of large machinery.

[0022] 4) When hoisting the radial main beam and the inner arc reticulated shell unit, the middle arc reticulated shell unit and the outer arc reticulated shell unit, the present invention uses the sliding winches of the central steel column and the peripheral columns for symmetrical hoisting, which can improve the stability of the reticulated shell structure during construction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram showing the fixing of the lower unit of the central steel column to the ground;

[0024] Figure 2 This is a schematic diagram of the installation of the unit on the central steel column and the single-suspension rotating device;

[0025] Figure 3 This is a schematic diagram of the unit opening in the central steel column;

[0026] Figure 4 This is a schematic diagram of the installation of the upper, middle, and lower units of the central steel column;

[0027] Figure 5 This is a schematic diagram of the vertical slide rail, slider, and brake plate;

[0028] Figure 6 This is a schematic diagram of the unit elevation of the central steel column;

[0029] Figure 7 This is a schematic diagram of the cross-section of a unit in the central steel column;

[0030] Figure 8 This is a schematic diagram of the unit elevation on the central steel column;

[0031] Figure 9 This is a schematic diagram of the cross-section of the unit on the central steel column;

[0032] Figure 10 This is the overall elevation view of the central steel column;

[0033] Figure 11 This is a schematic diagram showing the connection between the guide auxiliary arc and the slider;

[0034] Figure 12 This is a cross-sectional view of the overall installation of the guide auxiliary ring;

[0035] Figure 13 This is an elevation view of the overall installation of the guide auxiliary ring;

[0036] Figure 14 This is a schematic diagram of the welding and fixing of the central annular mesh shell;

[0037] Figure 15 This is a schematic diagram of the bolted connection between the central annular mesh shell and the guide auxiliary ring;

[0038] Figure 16 This is a schematic diagram of the hoisting of the central annular reticulated shell;

[0039] Figure 17 This is a schematic diagram of the brake plate jamming the central annular mesh shell;

[0040] Figure 18 This is a schematic diagram of the single-suspension rotating device for the surrounding columns;

[0041] Figure 19 It refers to the hoisting of the radial main beam;

[0042] Figure 20 This is the elevation view of the hoisting of the inner arc reticulated shell unit;

[0043] Figure 21 This is a cross-sectional view of the hoisting of the inner arc reticulated shell unit;

[0044] Figure 22 This is the elevation view of the hoisting of the mid-arc reticulated shell unit;

[0045] Figure 23 This is a cross-sectional view of the hoisting of the mid-arc reticulated shell unit;

[0046] Figure 24 This is the elevation view of the hoisting of the outer arc reticulated shell unit;

[0047] Figure 25 This is a cross-sectional view of the hoisting of the outer arc reticulated shell unit;

[0048] Figure 26 This is a cross-sectional view of the crawler crane lifting the central circular mesh shell;

[0049] Figure 27 It is a cross-sectional view of the crawler crane lifting the arc-shaped shell unit within the crawler crane's operating area;

[0050] Figure 28 It is a cross-sectional view of the lifting of the arc-shaped shell unit in the crawler crane's working area by the crawler crane;

[0051] Figure 29 It is a cross-sectional view of the crawler crane lifting the outer arc shell unit of the crawler crane's working area;

[0052] Figure 30 This is a flowchart of the hoisting process for a large-span steel structure grid roof.

[0053] In the diagram: 1-Lower unit of central steel column; 2-Anchor bolt; 3-Foundation; 4-Rotating device; 5-Upper unit of central steel column; 6-Middle unit of central steel column; 7-Pre-drilled hole for brake plate; 8-Bolted layer; 9-Fixing bolt; 10-Vertical slide rail; 11-Slider; 12-Brake plate; 13-Pulley; 14-Lifting lug; 15-Bolt pre-drilled hole; 16-Guide auxiliary arc; 17-Welded layer; 18-Guide auxiliary ring; 19- 20-Fixed winch; 21-Hook; 22-Boom; 23-Sliding winch; 24-Winder slide rail; 25-Central annular mesh shell; 26-Peripheral columns; 27-Counterweight; 28-Radial main beam; 29-Corner; 30-Inner arc mesh shell unit; 31-Middle arc mesh shell unit; 32-Outer arc mesh shell unit; 33-Single lifting rotating device; 34-Crawler crane; 35-Most central circular mesh shell; 36-Inclined rib plate. Detailed Implementation

[0054] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0055] Example 1

[0056] As one example, such as Figures 1 to 30 As shown, the hoisting method for this large-span steel grid roof includes the following construction steps:

[0057] Step 1: Erection of steel columns in the center of the site: Based on the actual grid shell structure under construction, determine the position of the steel columns in the center of the construction site. The steel columns are divided into three units: lower unit 1, middle unit 6, and upper unit 5. They are lifted and installed using a crawler crane 34. After adjusting the verticality with bolts, they are temporarily fixed in place. The upper, middle, and lower units are then welded together.

[0058] In the lower unit 1 of the central steel column, four vertical slide rails 10 are provided along the column. A slider 11 is provided in each vertical slide rail 10, and a lifting lug 14 is welded on the slider 11. The slider 11 can move in the vertical slide rails 10 through pulleys 13. The steel column of the lower unit 1 of the central steel column is bolted and welded to the ground foundation 3 using pre-installed anchor bolts 2.

[0059] In the central steel column unit 6, four small arms 19 are provided at the ends of the four vertical slide rails 10, and a fixed winch 20 is installed on each small arm 19. At the same time, during prefabrication, brake plate 12 pre-reserved holes 7 are reserved in the central steel column unit 6 and the vertical slide rails 10.

[0060] A remotely controlled 360-degree rotating device 4 is installed on the top of unit 5 on the central steel column. A pair of symmetrical booms 22 are installed on the rotating shaft, and two sliding winches 23 are installed on one boom 22. Winch rails 24 are provided for the sliding winches 23 so that they can move parallel to each other on the boom 22. The middle unit 6 and the upper unit 5 of the central steel column are installed sequentially by a crawler crane 34 and reinforced with bolts.

[0061] Step 2: Install the single-lift rotating device 33 on the surrounding columns 26.

[0062] A rotatable rotating device 4 is installed on the top of the supporting columns during the construction of the grid shell via a crawler crane 34. A single-lift rotating device 33 is installed on the rotating device 4, that is, a boom 22 is installed on the rotating device 4, and a winch rail 24 and a sliding winch 23 are installed on the boom 22.

[0063] Step 3: Fabrication and Installation of Guide Auxiliary Ring 18: The guide auxiliary ring 18 is divided into four parts, each of which is an arc-shaped structure, namely the guide auxiliary arc 16. Each arc-shaped structure is bolted and fixed to the slider 11 on the vertical slide rail 10. After installation, the arc-shaped guide auxiliary rings 18 are bolted and fixed in pairs to each other on the reserved bolting layer 8 using fixing bolts 9 to form a complete guide auxiliary ring 18.

[0064] Fabrication of the central annular mesh shell 25: The central annular mesh shell 25 is fabricated by dividing it into two parts, and a welding layer 17 is reserved at the connection point of the central annular mesh shell 25.

[0065] Step 4: Hoisting and Fixing the Central Annular Mesh Shell 25: The pre-fabricated central annular mesh shell 25 is divided into two parts and spliced ​​on the guide auxiliary ring 18 frame of the central steel column. The central annular mesh shell 25 is bolted and fixed to the guide auxiliary ring 18 frame, and the central annular mesh shell 25 is welded and fixed through the welding layer 17. The hook 21 of the fixed winch 20 on the central steel column unit 6 is hooked onto the lifting lug 14 on the movable slider 11 in the vertical slide rail 10. The four winches start working, and the central annular mesh shell 25 is hoisted upward along the vertical slide rail 10 to the designated position. The brake plate 12 is inserted into the reserved brake plate hole 7, and the brake plate 12 is bolted and fixed to the slider 11 and the vertical slide rail 10 through the bolt reserved hole 15 to achieve braking. The setting of the inclined rib plate 36 strengthens the support. The fixed winch 20 of the central steel column unit 6 is unloaded, and the central annular mesh shell 25 is fixed in the designated position by the brake plate 12. The fixed winch 20 and boom 19 of the central steel column unit 6 are dismantled using crawler crane 34.

[0066] Step 5: Hoisting and Bolting the Radial Main Beam 28: Based on the spatial positions of the central annular mesh shell 25 and the corbels 29 on the peripheral columns 26, the radial main beam 28 is fabricated in the factory using 3D scanning technology, avoiding the need for subsequent factory processing and modification due to installation errors. The hooks 21 on the outer sliding winch 23 of the central steel column unit 5 and the hooks 21 on the single-lifting rotating device 33 of the peripheral columns 26 are respectively engaged with the lifting lugs 14 at both ends of the radial main beam 28. The sliding winch 23 is used for symmetrical hoisting. After the radial main beam 28 is hoisted to the designated position, one end of the central annular mesh shell 25 is bolted and fixed with transverse bolts, and the other end is bolted and fixed with the pre-installed anchor bolts 2 on the corbels 29 of the peripheral columns 26. All radial main beams 28 are bolted and fixed to the central annular mesh shell 25 and the corbels 29 of the peripheral columns 26 in sequence.

[0067] Example 2

[0068] As another embodiment, this embodiment two proposes a more specific hoisting method for a large-span steel structure grid shell roof based on embodiment one. It also includes a method for hoisting and bolting the arc grid shell unit, welding and fixing the hoisted grid shell, fabricating, hoisting and welding the innermost circular grid shell 35, and fabricating, hoisting and welding the last reserved arc grid shell unit.

[0069] Arc-shaped mesh shell unit hoisting and bolting fixation: Based on the spatial position of the radial main beam 28, various arc-shaped mesh units are fabricated in the factory using 3D scanning technology. Specifically:

[0070] Inner arc reticulated shell unit 30: The inner arc reticulated shell unit 30 is hoisted symmetrically using the winches on the inner and outer sides of the two booms 22 on the unit 5 of the central steel column, and spliced ​​with the central annular reticulated shell 25 and the radial main beam 28 for bolting and fixing.

[0071] Central arc reticulated shell unit 31: The central arc reticulated shell unit 31 is hoisted symmetrically using the outer winch on the upper arm 22 of the central steel column unit 5 and the winch on the single hoisting rotating device 33 on the peripheral columns 26. It is then spliced ​​with the inner arc reticulated shell unit 30 and the radial main beam 28 and bolted to fix it.

[0072] Outer Arc Reticulated Shell Unit 32: The outer arc reticulated shell unit 32 is hoisted symmetrically using winches on the monotonic rotation devices 4 of two adjacent peripheral columns 26. It is then spliced ​​with the middle arc reticulated shell unit 31 and the radial main beam 28 and bolted in place.

[0073] It should be noted that since the crawler crane 34 will still be needed in subsequent processes, a set of lifting space for the inner arc mesh shell unit 30, the middle arc mesh shell unit 31 and the outer arc mesh shell unit 32 will be reserved as the working area for the crawler crane 34 and will not be installed at the moment.

[0074] After the hoisting of all arc-shaped grid shell units in other areas is completed, the hoisted grid shells are welded and fixed: the upper unit, middle unit and single-lifting rotating device 33 on the peripheral columns 26 of the central steel column are disassembled by the crawler crane 34 in the crawler crane 34 working area. The large-span steel structure grid shell roof units that have been bolted together are welded by an aerial work vehicle. This includes: welding the radial main beam 28 to the central annular grid shell 25, welding the inner arc grid shell unit 30 to the central annular grid shell 25 and the radial main beam 28, welding the middle arc grid shell unit 31 to the inner arc grid shell unit 30 and the radial main beam 28, and welding the outer arc grid shell unit 32 to the middle arc grid shell unit 31 and the radial main beam 28.

[0075] Fabrication, hoisting, and welding of the central circular mesh shell 35: Utilizing 3D scanning technology, the central circular mesh shell 35 is fabricated, avoiding the need for subsequent rework and modification of components due to welding errors. A crawler crane 34 is used to hoist the central circular mesh shell 35, and then an aerial work platform is used to weld it to the central annular mesh shell 25.

[0076] After completing the welding of the radial main beam 28, the arc-shaped reticulated shell unit, and the innermost circular reticulated shell 35 that have already been hoisted outside the crawler crane 34 operating area, the final reserved arc-shaped reticulated shell unit in the crawler crane 34 operating area will be fabricated, hoisted, and welded.

[0077] Using 3D scanning technology, the inner arc mesh shell unit 30 is fabricated. A crawler crane 34 and an aerial work platform are then used to hoist and weld the arc mesh shell unit from the inside out. Specifically, the remaining set of inner arc mesh shell units 30, middle arc mesh shell unit 31, and outer arc mesh shell unit 32 are hoisted and welded sequentially, while the crawler crane 34 is moved outwards simultaneously. After welding, the middle arc mesh shell unit 31 is fabricated again using 3D scanning technology and then hoisted and welded using the crawler crane 34 and the aerial work platform. Similarly, the outer arc mesh shell unit 32 is fabricated using 3D scanning technology and then hoisted and welded using the crawler crane 34 and the aerial work platform. This method avoids the problem of welding errors requiring subsequent rework and modification of the components.

[0078] After completing the welding of all arc-shaped grid shell units, the guide auxiliary ring 18, vertical slide rail 10, and lower unit 1 of the central steel column are removed in sequence, thus completing the hoisting work of the large-span steel structure grid shell roof.

[0079] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0080] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A method for hoisting a large-span steel structure grid shell roof, characterized in that, The construction steps include the following: Step 1: The lower unit of the central steel column has vertically sliding sliders around it. The middle unit of the central steel column is equipped with four fixed winches. The upper unit of the central steel column is equipped with a rotating device and two booms. Each boom is equipped with a sliding winch. Step 2: Install a rotating device and a boom on the top of the surrounding columns, and slide a sliding winch on the boom to form a single-lift rotating device; Step 3: Fix the four guide auxiliary arcs onto the slider and connect them to form a guide auxiliary ring; Step 4: The central annular mesh shell is spliced ​​on the guide auxiliary ring frame, the hoisting slider is fixed, and a brake plate is set below the central annular mesh shell to support it. Step 5: Use the sliding winches on the central steel column unit and the peripheral columns to hoist the radial main beam between the central annular mesh shell and the peripheral columns; and hoist the arc mesh shell unit and the innermost circular mesh shell.

2. The hoisting method for a large-span steel structure grid roof according to claim 1, characterized in that, The central steel column is formed by hoisting the lower unit, middle unit, and upper unit of the central steel column. The lower unit of the central steel column is equipped with vertical slide rails along its height. A slider is installed in the vertical slide rail, and a lifting lug is welded on the slider. The slider moves in the vertical slide rail via pulleys. At the end of the four vertical slide rails in the middle unit of the central steel column, there are four small arms. A fixed winch is installed on each small arm. Brake plate pre-drilling holes are reserved in the middle unit of the central steel column and the vertical slide rails. A rotating device is installed on the top of the upper unit of the central steel column. Large arms are symmetrically installed on the rotating shaft of the rotating device. Winch slide rails and two sliding winches are installed on each large arm. The sliding winches move horizontally on the large arm.

3. The hoisting method for a large-span steel structure grid roof according to claim 2, characterized in that, The central annular mesh shell is divided into two parts and spliced ​​on the guide auxiliary ring frame of the central steel column. The central annular mesh shell is bolted to the guide auxiliary ring frame and the two parts of the central annular mesh shell are welded together. The hook of the fixed winch on the central steel column unit hooks the movable slider in the vertical slide rail. The four fixed winches start working. The central annular mesh shell is lifted up along the vertical slide rail to the designated position. The brake plate is inserted into the reserved hole of the brake plate. The brake plate is bolted to the slider and the vertical slide rail through the reserved bolt holes to achieve braking. The brake plate is set with diagonal ribs. The fixed winches of the central steel column unit are unloaded. The central annular mesh shell is placed on the brake plate. The fixed winches and boom of the central steel column unit are disassembled using a crawler crane.

4. The hoisting method for a large-span steel structure grid roof according to claim 2, characterized in that, Brackets are installed on the surrounding columns with pre-installed anchor bolts. Based on the spatial position of the central annular mesh shell and the brackets on the surrounding columns, radial main beams are fabricated. The sliding winches installed on the outer side of the central steel column and on the surrounding columns are respectively used to hoist both ends of the radial main beams. The sliding winches are used for symmetrical hoisting. After the radial main beams are hoisted to the designated positions, one end of the radial main beam is bolted to the central annular mesh shell with transverse bolts, and the other end is bolted to the pre-installed anchor bolts on the brackets on the surrounding columns. All radial main beams are bolted to the central annular mesh shell and the brackets on the surrounding columns in sequence.

5. The hoisting method for a large-span steel structure grid roof according to claim 2, characterized in that, The arc-shaped shell unit includes an inner arc-shaped shell unit, a middle arc-shaped shell unit, and an outer arc-shaped shell unit. The inner arc-shaped shell unit is hoisted symmetrically using sliding winches on the two booms of the unit on the central steel column. The middle arc-shaped shell unit is hoisted symmetrically using sliding winches on the outer side of the boom of the unit on the central steel column and sliding winches on the peripheral columns. The outer arc-shaped shell unit is hoisted symmetrically using sliding winches on the rotating devices of two adjacent peripheral columns.

6. The hoisting method for a large-span steel structure grid roof according to claim 5, characterized in that, A set of lifting space for the inner arc mesh shell unit, middle arc mesh shell unit and outer arc mesh shell unit is reserved as the crawler crane operation area. That is, the installation of the arc mesh shell unit in this area is not carried out first. After the lifting of all the arc mesh shell units in other areas is completed, the most central circular mesh shell is lifted by the crawler crane. Then, the upper unit and middle unit of the central steel column are dismantled by the crawler crane, and the single lifting and rotating device on the surrounding columns is removed. Then, the radial main beam, arc mesh shell unit and the most central circular mesh shell that have been lifted are welded.

7. The hoisting method for a large-span steel structure grid roof according to claim 6, characterized in that, After completing the welding of the radial main beam, arc-shaped mesh shell unit, and the innermost circular mesh shell that have been hoisted outside the crawler crane operating area, the arc-shaped mesh shell unit in the crawler crane operating area is hoisted and welded: the arc-shaped mesh shell unit is hoisted and welded from the inside out using a crawler crane and an aerial work platform. The remaining set of inner arc-shaped mesh shell units, middle arc-shaped mesh shell units, and outer arc-shaped mesh shell units are hoisted and welded in sequence, while the crawler crane is moved outwards simultaneously. After all the arc-shaped mesh shell units are welded, the guide auxiliary ring, vertical slide rail, and lower unit of the central steel column are removed in sequence.

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