Splicing device for large-span folded-surface arch truss and mounting and dismounting method of splicing device

Abstract

The invention provides an assembling device for a large-span folded-surface arch truss and a mounting and dismounting method of the assembling device, and relates to the field of steel structures. First jig frame units and second jig frame units are arranged in parallel at intervals in the span direction of the to-be-assembled large-span folded-face arch truss, the first jig frame units are arranged at the two ends of the to-be-assembled large-span folded-face arch truss respectively, and the multiple sets of second jig frame units are located between the first jig frame units at the two ends. The height of the second jig frame unit is gradually reduced from the middle part of the to-be-assembled large-span folded-surface arch truss to the direction close to the end part, and the height of the first jig frame unit is the lowest; the multiple sets of riding tracks are arranged at intervals in the width direction of the large-span folded-face arch truss to be assembled, and each set of riding tracks extends in the span direction of the large-span folded-face arch truss and is connected with the first jig frame unit and the second jig frame unit. According to the splicing device and the assembling and disassembling method, the high-altitude stability of the large-span folded-surface arch truss can be effectively guaranteed.

Description

Technical Field

[0001] The present application relates to the field of building steel structures, and in particular to an assembly device for a large-span folded-surface arch truss and an installation and disassembly method thereof. Background Art

[0002] With the development of the domestic construction industry, an increasing number of large-span space trusses are being used in projects such as stadiums, airport terminals, and convention centers, often becoming representative buildings of a city. These trusses, characterized by large spans, large steel pipe diameters, varied bends, and high tonnage, are becoming increasingly diverse and complex in their structural forms and spatial design. Consequently, the requirements for positioning coordinates and precision during construction are becoming increasingly stringent.

[0003] Figure 1 This is a schematic diagram of the structure of a long-span folded arch truss 1. The folded arch truss 1 consists of a central inverted triangle main truss 11 and two wing trusses 12, with the wing trusses 12 symmetrically arranged about the main truss 11. The main truss 11 consists of two upper chords, a lower chord, and a web member; the wing trusses consist of a chord member and a web member. The chord member is lower than the upper chord but higher than the lower chord. All five chords are curved tubes, forming a "one main, two wing" folded arch configuration. Each truss is connected by short tubes.

[0004] At present, large-span trusses in the industry are often installed by ground-based on-site assembly + overall lifting. The on-site assembly of the trusses requires the support and connection of a tire frame. Based on the structural analysis of the large-span folded arch truss 1, the truss assembly cradle commonly used in the industry has the following problems: (1) the large-span folded arch truss 1 is composed of five chords and webs, and the existing inverted triangle space truss assembly cradle is not suitable for the assembly of the large-span folded arch truss 1; (2) the existing inverted triangle space truss assembly cradle mostly adopts an assembled structure with adjustable space size. Although it is suitable for assembling trusses of different specifications, it has weak supporting and bearing capacity for trusses with large tonnage and large span, especially those with larger width. During the assembly and welding of the trusses, uneven tilt displacement will be generated, and even deformation may be caused. In addition, the position and size of the trusses that have been assembled and welded cannot be effectively adjusted, resulting in low construction accuracy; (3) the existing inverted triangle space truss assembly cradle uses a large amount of materials and has high cost; (4) although the existing inverted triangle space truss assembly cradles are mostly assembled structures, the disassembly turnover efficiency during on-site construction is extremely low, resulting in a long construction period and low practicality. Summary of the Invention

[0005] One of the purposes of this application is to provide an assembly device for a large-span folded arch truss and an installation and disassembly method thereof, aiming to solve the problem that the existing inverted triangle space truss assembly frame is not suitable for the assembly of large-span folded arch trusses.

[0006] The technical solution of this application is: An assembling device for a large-span folded-surface arch truss comprises a first tire frame unit, a second tire frame unit and a bridleway; The first tire frame units and the second tire frame units are arranged in parallel and spaced apart along the span direction of the large-span folding arch truss to be assembled, each group of the first tire frame units and each group of the second tire frame units extend along the width direction of the large-span folding arch truss, and the first tire frame units are respectively arranged at both ends of the large-span folding arch truss to be assembled, and multiple groups of the second tire frame units are located between the first tire frame units at both ends; the height of the second tire frame units gradually decreases from the middle of the large-span folding arch truss to be assembled toward the end, and the height of the first tire frame units is the lowest; Multiple groups of the horseways are arranged at intervals along the width direction of the large-span folded arch truss to be assembled, and each group of the horseways extends along the span direction of the large-span folded arch truss and is connected to the first tire frame unit and the second tire frame unit respectively.

[0007] As a technical solution of the present application, the large-span folded arch truss includes a plurality of chords arranged at intervals along the width direction and extending along the span direction, and each of the chords is divided into a plurality of segmented sections connected in sequence; a group of the second tire frame units are arranged at each end of the segmented sections at the middle position, and a group of the second tire frame units or a group of the first tire frame units are arranged at one end of the segmented sections at other positions.

[0008] As a technical solution of the present application, the first tire frame unit includes a first branch roadbed box, a first limb, a first connecting beam, a first main roadbed box, a first main limb, an adjustable support assembly, a first connecting beam, a first cable and a first fixed beam; the first branch roadbed box and the first main roadbed box are arranged at intervals along the width direction of the large-span folding arch truss to be assembled, and both extend along the width direction of the large-span folding arch truss to be assembled, and the first main roadbed box is located between the two first branch roadbed boxes; the first limb and the first main limb both extend along the span direction of the large-span folding arch truss to be assembled, and the height of the first branch limb is lower than the height of the first main limb; the two first limbs are installed on the first branch roadbed box in parallel and at intervals, and the first connecting beam connects Between the upper parts of the two first branches; the two first main branches are installed on the first main roadbed box in parallel and at intervals, the adjustable support assembly is installed on the first main roadbed box, and the two ends are connected to the lower parts of the two first main branches by multiple bolts; the two ends of the first connecting beam are respectively welded between the adjacent first main roadbed boxes and the first branch roadbed boxes; the two ends of the first cable are respectively connected to the adjacent first branches and the first main branches by ear plates and pins; the first fixed beam is inclined and is above the first cable, and the two ends are respectively connected to the adjacent first branches and the first main branches by multiple bolts; the top surfaces of the two ends of the first fixed beam are respectively welded with horizontally arranged first support brackets for supporting the horseway.

[0009] As a technical solution of the present application, the first connecting beam includes two first positioning braces, a first positioning crossbeam and two first arc-shaped groove plates; the two first positioning braces are arranged in an eight-shape and are respectively connected to the corresponding first branches; the first positioning crossbeam is installed on the two first positioning braces; the two first arc-shaped groove plates are installed on the first positioning crossbeam at intervals, and both extend along the width direction of the large-span folded arch truss to be assembled; the first arc-shaped groove plate is used to support the chord rod of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the chord rod to be assembled; the first fixed beam and the first positioning brace are respectively located at opposite sides of the first branch, and intersect at the same node position of the first branch; the adjustable support assembly includes a base, a thousand A jack, a bracket, a connecting beam and a saddle; the base and the jack are respectively arranged on the first main roadbed box, and the jack is used to lift and adjust the height of the connecting beam; the bracket is installed on the base by a plurality of bolts; the connecting beam is horizontally welded to the top of the bracket, and the two ends are respectively connected between the lower parts of the two first main limbs by a plurality of bolts; the saddle includes a base plate, two trapezoidal arc plates and reinforcing ribs, the base plate is installed on the connecting beam, the two trapezoidal arc plates are installed on the base plate in parallel and at intervals and both extend along the width direction of the large-span folded arch truss to be assembled, and the reinforcing ribs are connected between the two trapezoidal arc plates; the trapezoidal arc plate is used to support the lower chord of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the lower chord to be assembled.

[0010] As a technical solution of the present application, the first limb includes a first sub-adjustment beam, a first sub-lifting ear, a first sub-column, two first sub-bracings and two first sub-corbels; the axial direction of the first sub-adjustment beam is parallel to the axial direction of the large-span folded-surface arch truss to be assembled; the first sub-column is vertically fixed to the middle of the first sub-adjustment beam; the first sub-lifting ear is arranged at the lower part of the first sub-column; the two first sub-corbels are respectively welded at opposite sides of the upper part of the first sub-column and are both parallel to the first sub-adjustment beam; the two first sub-bracings are respectively arranged on both sides of the first sub-column, and the two ends of each first sub-bracing are respectively connected between the top of the first sub-adjustment beam and the bottom of the first sub-corbel; the first main limb includes a first main adjusting beam, a first main lifting ear, a first main column, two first main diagonal braces, two first main corbels, a first diagonal brace, a first supporting beam and a first arc-shaped groove plate; the axial direction of the first main adjusting beam is parallel to the axial direction of the large-span folded-surface arch truss to be assembled; the first main column is vertical fixed to the middle part of the first main adjustment beam; the first main lifting ear is provided at the lower part of the first main column; the two first main brackets are respectively welded to the opposite sides of the upper part of the first main column and are parallel to the first main adjustment beam; the two first main diagonal braces are respectively provided on both sides of the first main column, and the two ends of each first main diagonal brace are respectively connected between the top of the first main adjustment beam and the bottom of the first main bracket; the first diagonal brace is provided at an angle, and one end is connected to one side of the first main column; the first supporting crossbeam is welded to the first diagonal brace; the first arc-shaped groove plate is installed on the first supporting crossbeam and extends along the width direction of the large-span folded arch truss to be assembled; the first arc-shaped groove plate is used to support the upper chord of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the upper chord to be assembled; the first fixed beam and the first diagonal brace are respectively located on opposite sides of the first main column and intersect at the same node position of the first main column.

[0011] As a technical solution of the present application, gaskets of different thicknesses are inserted between the first branch and the first branch roadbed box to adjust the verticality, horizontality and height of the first branch; gaskets of different thicknesses are inserted between the first main limb and the first main roadbed box to adjust the verticality, horizontality and height of the first main limb; gaskets of different thicknesses are inserted between the adjustable support assembly and the first main roadbed box to adjust the verticality, horizontality and height of the adjustable support assembly.

[0012] As a technical solution of the present application, the second tire frame unit includes a second branch roadbed box, a second limb, a second connecting beam, a second main roadbed box, a second main limb, a supporting beam, a second connecting beam, a second cable and a second fixed beam; the second branch roadbed boxes extend along the width direction of the large-span folding arch truss to be assembled; the extension direction of the second main roadbed box is perpendicular to the extension direction of the second branch roadbed box, and the second main roadbed box is located between the two second branch roadbed boxes; the second limb and the second main limb extend along the span direction of the large-span folding arch truss to be assembled, and the height of the second limb is lower than the height of the second main limb; the two second limbs are connected to the second branch roadbed box in parallel and at intervals, and the second Two connecting beams are welded between the upper parts of the two second branches; the two second main branches are connected to the second main roadbed box in parallel and at intervals, and the two ends of the support beam are respectively connected between the middle parts of the two second main branches; the two ends of the second connecting beam are respectively welded between the adjacent second main roadbed boxes and the second branch roadbed boxes; the two ends of multiple second cables are respectively connected between the adjacent second branches and the second main branches through ear plates and pins; the second fixed beam is arranged at an angle and is located above the second cable, and the two ends are respectively connected between the adjacent second branches and the second main branches through multiple bolts; the top surfaces of the two ends of the second fixed beam are respectively fixed with horizontally arranged second support brackets for supporting the horseway.

[0013] As a technical solution of the present application, the second connecting beam includes two second positioning diagonal braces, a second positioning crossbeam and two second arc-shaped groove plates; the two second positioning diagonal braces are arranged in an eight-shaped shape and are respectively connected to the corresponding second branches; the second positioning crossbeam is welded to the two second positioning diagonal braces; the two second arc-shaped groove plates are welded to the second positioning crossbeam at intervals and extend along the width direction of the large-span folded arch truss to be assembled; the second arc-shaped groove plate is used to support the chord rod of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the chord rod to be assembled; the second fixing The beam and the second positioning brace are respectively located on opposite sides of the second branch and intersect at the same node position of the second branch; the support beam includes two connecting braces, a fixed crossbeam and an arc-shaped groove plate; the two connecting braces are arranged in an eight-shape and are respectively connected to the corresponding second branches; the fixed crossbeam is welded to the two connecting braces; the arc-shaped groove plate is welded to the fixed crossbeam and extends along the width direction of the large-span folded arch truss to be assembled; the arc-shaped groove plate is used to support the lower chord of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the lower chord to be assembled.

[0014] As a technical solution of the present application, the second limb includes a second branch adjustment beam, a second branch lifting ear, a second branch column, two second branch diagonal braces and two second branch legs; the axial direction of the second branch adjustment beam is parallel to the axial direction of the large-span folded surface arch truss to be assembled; the second branch column is vertically fixed to the middle of the second branch adjustment beam; the second branch lifting ear is provided at the lower part of the second branch column; the two second branch legs are respectively welded at opposite sides of the upper part of the second branch column, and are both parallel to the second branch adjustment beam; the two second branch diagonal braces are respectively provided on both sides of the second branch column, and the two ends of each second branch diagonal brace are respectively connected between the top of the second branch adjustment beam and the bottom of the second branch leg; the second main limb includes a second main adjustment beam, a second main lifting ear, a second main column, two second main diagonal braces, two second main legs, a second diagonal brace, a second supporting beam and a second arc-shaped groove plate; the axial direction of the second main adjustment beam is parallel to the axial direction of the large-span folded surface arch truss to be assembled; the second main column is vertical fixed to the middle part of the second main adjustment beam; the second main lifting ear is provided at the lower part of the second main column; the two second main brackets are respectively welded to the opposite sides of the upper part of the second main column and are parallel to the second main adjustment beam; the two second main diagonal braces are respectively provided on both sides of the second main column, and the two ends of each second main diagonal brace are respectively connected between the top of the second main adjustment beam and the bottom of the second main bracket; the secondary diagonal brace is inclined, and one end is connected to one side of the second main column; the second supporting crossbeam is welded to the secondary diagonal brace; the second arc-shaped groove plate is installed on the second supporting crossbeam and is arranged along the width direction of the large-span folded arch truss to be assembled; the second arc-shaped groove plate is used to support the upper chord of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the upper chord to be assembled; the second fixed beam and the second diagonal brace are respectively located on opposite sides of the second main column and intersect at the same node position of the second main column.

[0015] As a technical solution of the present application, gaskets of different thicknesses are inserted between the second branch limb and the second branch roadbed box to adjust the verticality, horizontality and height of the second branch limb; gaskets of different thicknesses are inserted between the second main limb and the second main roadbed box to adjust the verticality, horizontality and height of the second main limb.

[0016] As a technical solution of the present application, the strength, stiffness and stability of the assembly device for the large-span folded arch truss are calculated by finite element analysis software, and the cross-section and distribution quantity of the first tire frame unit, the second tire frame unit and the various components in the horseway are optimized and iteratively calculated so that the stress ratio of the first tire frame unit, the second tire frame unit and the various components in the horseway is between 0.8-0.85 and the maximum deformation value is within 5mm.

[0017] A method for installing and disassembling the large-span folded arch truss using the assembly device as described above comprises the following steps: S1, component factory divisional production: the first sub-roadbed box, the first branch, the first connecting beam, the first main roadbed box, the first main limb, the adjustable support assembly, the first connecting beam, the first cable, and the first fixed beam in the first tire frame unit are respectively produced as individual sub-components and transported to the site; the second sub-roadbed box, the second branch, the second connecting beam, the second main roadbed box, the second main limb, the support beam, the second connecting beam, the second cable, and the second fixed beam in the second tire frame unit are respectively produced as individual sub-components and transported to the site; the bridleway is produced as individual sub-components and transported to the site; S2, first installation on site: according to the projection position of the large-span folded arch truss on the ground, mark out and lay out the first branch roadbed box, the first main roadbed box, the second branch roadbed box, and the second main roadbed box, and connect the adjacent first branch roadbed boxes and the first main roadbed box in each group of the first tire frame units through the first connecting beam, and connect the adjacent second branch roadbed boxes and the second main roadbed box in each group of the second tire frame units through the second connecting beam; respectively install the first branch on the first branch roadbed box, the first main limb on the first main roadbed box, the second branch on the second branch roadbed box, and the second main limb on the second main roadbed box; insert a gasket between the first branch adjustment beam and the first branch roadbed box to adjust the first branch, and install a first connecting beam between the two first branch limbs; insert a gasket between the first main adjustment beam of the first main limb and the first main roadbed box to adjust the first main limb, and install an adjustable support assembly between the two first main limbs; Insert a gasket between the first sub-adjustment beam and the first sub-roadbed box to adjust the first connecting beam; insert a gasket between the base of the adjustable support assembly and the first main roadbed box to adjust the adjustable support assembly; install a first fixed beam and a first cable between the first limb and the first main limb, and apply prestress to the first cable; insert a gasket between the second sub-adjustment beam of the second limb and the second sub-roadbed box to adjust the second limb, and install a second connecting beam between the two second limbs; insert a gasket between the second main adjustment beam of the second main limb and the second main roadbed box to adjust the second main limb, and install a support beam between the two second main limbs; insert a gasket between the second sub-adjustment beam of the second limb and the second sub-roadbed box to adjust the second connecting beam; insert a gasket between the second main adjustment beam of the second main limb and the second main roadbed box to adjust the support beam; install a second fixed beam and a second cable between the second limb and the second main limb, and apply prestress to the second cable; install the horseway; S3, first disassembly on site: after the in-situ assembly, welding and lifting of the plurality of large-span folding arch trusses are completed, the assembly device for the large-span folding arch trusses is disassembled and transferred to the projection position of the plurality of large-span folding arch trusses to be assembled subsequently on the ground; wherein, when the assembly device for the large-span folding arch trusses is disassembled, the second main door-type unit composed of the second main roadbed box, the second main limb and the support beam is hoisted, disassembled and transported as a whole; the second branch door-type unit composed of the second branch roadbed box, the second branch limb and the second connecting beam is hoisted, disassembled and transported as a whole; the first main door-type unit composed of the first main roadbed box, the first main limb and the adjustable support assembly is hoisted, disassembled and transported as a whole; the first branch door-type unit composed of the first branch roadbed box, the first branch limb and the first connecting beam is hoisted, disassembled and transported as a whole; S4, second installation on site: staking out and marking the projection positions of the subsequent multiple large-span folded arch trusses on the ground, installing multiple groups of the first main door-type unit, the first branch door-type unit, the second main door-type unit, and the second branch door-type unit; inserting a shim between the first branch adjustment beam and the first branch roadbed box to adjust the first connecting beam; inserting a shim between the base and the first main roadbed box to adjust the adjustable support assembly; inserting a shim between the second branch adjustment beam and the second branch roadbed box to adjust the second connecting beam; inserting a shim between the second main adjustment beam and the second main roadbed box to adjust the support beam; installing the first fixing beam and the first cable between the first branch and the first main limb and applying prestress, and installing the second fixing beam and the second cable between the second branch and the second main limb and applying prestress; installing the horseway; S5, repeating the steps from S3 to S4 on site to circulate the large-span folded arch truss assembly device.

[0018] Beneficial effects of this application: (1) The present application designs an assembly device for a large-span folding arch truss, which designs a first tire frame unit, a second tire frame unit and a horseway, and arranges the first tire frame unit at both ends of the large-span folding arch truss to be assembled, and multiple groups of second tire frame units are located between the first tire frame units at both ends. The height of the second tire frame unit is gradually reduced from the middle of the large-span folding arch truss to be assembled to the direction close to the end, and the height of the first tire frame unit is the lowest, which solves the problem that the large-span folding arch truss cannot be assembled using the existing truss tire frame, and effectively ensures the assembly accuracy of the large-span wide-wing single-curved complex space truss.

[0019] (2) Furthermore, the present application solves the problem of insufficient bearing capacity when the existing truss assembly uses a truss to support large-tonnage, large-span complex space trusses, resulting in tilting displacement and deformation during the truss assembly process by inserting gaskets of different thicknesses between the first branch and the first branch roadbed box, inserting gaskets of different thicknesses between the first main limb and the first main roadbed box, inserting gaskets of different thicknesses between the adjustable support assembly and the first main roadbed box, inserting gaskets of different thicknesses between the second branch and the second branch roadbed box, inserting gaskets of different thicknesses between the second main limb and the second main roadbed box, and inserting gaskets of different thicknesses between the support beam and the second main roadbed box. At the same time, the present application solves the problem of insufficient bearing capacity when the existing truss assembly uses a truss to support large-tonnage, large-span complex space trusses, resulting in tilting displacement and deformation during the truss assembly process by connecting the various components in the first truss unit by bolting or welding, and connecting the various components in the second truss unit by bolting or welding. The present application also solves the problem of insufficient bearing capacity when the existing truss assembly uses a truss to support large-tonnage, large-span complex space trusses, and greatly improves the assembly accuracy of large-tonnage, large-span complex space trusses.

[0020] (3) Furthermore, the present application uses a large number of first cables to connect the first branch limb and the first main limb, and uses a large number of second cables to connect the second branch limb and the second main limb, thereby greatly reducing the overall steel consumption of the device and improving the installation and disassembly efficiency of the device, saving costs and time and effort.

[0021] (4) Furthermore, the present application adopts a stress analysis iterative calculation method to optimize the cross-section and distribution number of each component in the device, solving the problem of high cost of measures caused by the large cross-section of existing truss frame components, and greatly reducing construction costs.

[0022] (5) The present application provides a method for installing and disassembling a large-span folded arch truss using an assembly device. The method manufactures each component in a factory and installs or disassembles each component in a classified and modular manner. This method solves the problems of the existing truss frame, which is cumbersome to install and disassemble, inefficient, and not practical on site during on-site turnover. It greatly improves construction efficiency and reduces labor and machinery costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the following is a brief introduction to the drawings required for use in the implementation methods. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of the large-span folded arch truss provided for this application; Figure 2A schematic diagram of an assembly device for a large-span folded arch truss provided in the first embodiment of the present application; Figure 3 A schematic structural diagram of a first tire frame unit provided in the first embodiment of the present application; Figure 4 A schematic structural diagram of a second tire frame unit provided in the first embodiment of the present application; Figure 5 A schematic diagram of the first connecting beam structure provided in the first embodiment of the present application; Figure 6 A schematic diagram of the first limb structure provided in the first embodiment of the present application; Figure 7 A schematic diagram of the structure of an adjustable support assembly provided in the first embodiment of the present application; Figure 8 A schematic diagram of the first fixed beam structure provided in the first embodiment of the present application; Figure 9 A schematic diagram of the first main limb structure provided in the first embodiment of the present application; Figure 10 A schematic diagram of the support beam structure provided in the first embodiment of the present application; Figure 11 An exploded schematic diagram of a factory-divided production of components in an assembly device for a large-span folded arch truss provided in a second embodiment of the present application; Figure 12 A schematic diagram of the first process of installing and disassembling an on-site large-span folded arch truss using an assembly device according to the second embodiment of the present application; Figure 13 A schematic diagram of the second process of installing and disassembling the on-site large-span folded arch truss using the assembly device provided in the second embodiment of the present application; Figure 14 A schematic diagram of the third process of installing and disassembling the on-site large-span folded arch truss using the assembly device provided in the second embodiment of the present application; Figure 15 A schematic diagram of the fourth process of installing and disassembling the on-site large-span folded arch truss using the assembly device provided in the second embodiment of the present application; Figure 16 Schematic diagram of the fifth process of installation and disassembly of the on-site large-span folded arch truss using the assembly device provided in the second embodiment of the present application.

[0025] Icons: 1-Large-span folded-surface arch truss; 11-Main truss; 12-Wing truss; 2-Assembly device for large-span folded-surface arch truss; 3-First tire frame unit; 31-First branch roadbed box; 32-First branch limb; 321-First branch adjustment beam; 322-First branch lifting lug; 323-First branch column; 324-First branch diagonal brace; 325-First branch corbel; 33-First connecting beam; 331-First positioning diagonal brace; 332-First positioning crossbeam; 333-First arc-shaped groove plate; 34-First main roadbed box; 35-First main limb; 351-First main adjustment beam; 352-First main lifting lug; 353-First main column; 354-First main diagonal brace; 355-First main corbel; 356-First diagonal brace; 357-First support Support beam; 358-first arc-shaped groove plate; 36-adjustable support assembly; 361-base; 362-jack; 363-bracket; 364-connecting beam; 365-saddle; 37-first connecting beam; 38-first cable; 39-first fixed beam; 391-first supporting corbel; 4-second tire frame unit; 41-second branch roadbed box; 42-second branch; 43-second connecting beam; 44-second main roadbed box; 45-second main limb; 46-support beam; 461-connecting diagonal brace; 462-fixed beam; 463-arc-shaped groove plate; 47-second connecting beam; 48-second cable; 49-second fixed beam; 491-second supporting corbel; 5-horseway; 6-second branch door unit; 7-second main door unit. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0029] In the description of this application, it should be noted that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the invented product is usually placed when in use. These are only for the convenience of describing this application 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. Therefore, they should not be understood as limitations on this application.

[0030] In addition, in this application, unless otherwise expressly specified or limited, the phrase "a first feature is above or below a second feature" may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, the phrases "above, above, and above the second feature" may include the first feature being directly above and obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The phrases "below, below, and below the second feature" may include the first feature being directly below and obliquely below the second feature, or simply indicate that the first feature is lower in level than the second feature.

[0031] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0032] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0033] First embodiment: The solution of this embodiment is targeted at subjects such as Figure 1 As shown, the large-span folded arch truss 1 consists of a central inverted triangle main truss 11 and two wing trusses 12, with the wing trusses 12 symmetrically arranged about the main truss 11. The main truss 11 consists of two upper chords, a lower chord, and a web member; the wing truss 12 consists of a chord member and a web member. The chord member is lower in elevation than the upper chord but higher than the lower chord. All five chords are curved tubes. The truss as a whole presents a "one main, two wings" folded arch shape. A single truss has a span of 99.5 meters, a width of 17 meters, and a rise of 6 meters. The main truss 11 is 3 meters wide, and the wing trusses 12 are 7 meters wide. Adjacent trusses are connected by 1-meter short tubes. Each truss weighs 218 tons. In addition, all chords are divided into six segments.

[0034] Please refer to Figure 2 , with reference Figures 3 to 10 The present application provides an assembly device 2 for a large-span folded arch truss, which mainly includes two groups of first tire frame units 3, six groups of second tire frame units 4 and five groups of horseways 5. Each group of first tire frame units 3 has a symmetrical structure with respect to the axial center line of the projection of the main truss 11 on the ground at the construction site, and each group of second tire frame units 4 has a symmetrical structure with respect to the axial center line of the projection of the main truss 11 on the ground at the construction site. Among them, the first tire frame unit 3 and the second tire frame unit 4 are arranged in parallel and at intervals along the span direction of the large-span folding arch truss 1 to be assembled, each group of first tire frame units 3 and each group of second tire frame units 4 extend along the width direction of the large-span folding arch truss 1, and the two groups of first tire frame units 3 are respectively arranged at the two ends of the large-span folding arch truss 1 to be assembled, and the six groups of second tire frame units 4 are all between the first tire frame units 3 at the two ends; at the same time, the height of the second tire frame unit 4 gradually decreases from the middle of the large-span folding arch truss 1 to be assembled to the direction close to the end, and the first tire frame unit 4 is arranged at the two ends of the large-span folding arch truss 1 to be assembled. The height of the first tire frame unit 3 is the lowest, that is, the heights of the first tire frame unit 3 and the second tire frame unit 4 both increase in adaptability as the axial arch height of the large-span folded-surface arch truss 1 increases; in addition, the five groups of horseways 5 are arranged at intervals along the width direction of the large-span folded-surface arch truss 1 to be assembled, and each group of horseways 5 extends along the span direction of the large-span folded-surface arch truss 1, and is respectively connected to the first tire frame unit 3 and the second tire frame unit 4, each group of horseways 5 corresponds to the upper chord, lower chord, and wing chord, respectively, and is respectively arranged close to the corresponding upper chord, lower chord, and wing chord positions.

[0035] Among them, each upper chord, lower chord and wing chord in the large-span folded arch truss 1 is divided into six segmented sections; a group of second tire frame units 4 are respectively arranged at both ends of the third segmented section and the fourth segmented section in each upper chord, and a group of second tire frame units 4 or a group of first tire frame units 3 are arranged at only one end of the segmented section at other positions; a group of second tire frame units 4 are respectively arranged at both ends of the third segmented section and the fourth segmented section in each lower chord, and a group of second tire frame units 4 or a group of first tire frame units 3 are arranged at only one end of the segmented section at other positions; a group of second tire frame units 4 are respectively arranged at both ends of the third segmented section and the fourth segmented section in each wing chord, and a group of second tire frame units 4 are respectively arranged at both ends of the segmented section at other positions.

[0036] Because the long-span folded arch truss 1 is not a flat truss and has a certain degree of arch, with its center being the highest point from the ground and its ends being the lowest, the heights of the first and second tread units 3 and 4 must vary with the height of the long-span folded arch truss 1 above the ground to effectively support the truss. Furthermore, since the center of the long-span folded arch truss 1 is the highest point from the ground, to maintain the truss's high-altitude stability, two sets of second tread units 4 are used to support the two segmented rods at the center.

[0037] Please refer to Figure 3 The first tire frame unit 3 includes a first branch roadbed box 31, a first branch limb 32, a first connecting beam 33, a first main roadbed box 34, a first main limb 35, an adjustable support assembly 36, a first connecting beam 37, a first cable 38 and a first fixed beam 39; wherein the first branch roadbed box 31 and the first main roadbed box 34 are arranged at intervals along the width direction of the large-span folding arch truss 1 to be assembled, and both extend along the width direction of the large-span folding arch truss 1 to be assembled, and the first main roadbed box 31 and the first main roadbed box 34 are arranged at intervals along the width direction of the large-span folding arch truss 1 to be assembled, and The base box 34 is located between the two first branch road base boxes 31, that is, the axial direction of the first branch road base box 31 and the first main road base box 34 is perpendicular to the axial direction of the large-span folded surface arch truss 1; at the same time, the first branch limb 32 and the first main limb 35 are extended along the span direction of the large-span folded surface arch truss 1 to be assembled, and the height of the first branch limb 32 is lower than the height of the first main limb 35; the two first branches 32 are installed vertically on the first branch road base box 31 in parallel and at intervals, and the first connecting beam 33 is connected Between the upper parts of the two first branches 32; in addition, the two first main branches 35 are vertically installed on the first main roadbed box 34 in parallel and at intervals, and the adjustable support assembly 36 is installed on the first main roadbed box 34, and the two ends are connected between the lower parts of the two first main branches 35 by multiple bolts; and the two ends of the first connecting beam 37 are respectively welded between the adjacent first main roadbed box 34 and the first branch roadbed box 31; the two ends of a plurality of first cables 38 are respectively connected between the adjacent first branches 32 and the first main branches 35 by ear plates and pins; the first fixed beam 39 is inclined and is above the first cable 38, and the two ends are respectively connected between the adjacent first branches 32 and the first main branches 35 by multiple bolts; the top surfaces of the two ends of the first fixed beam 39 are respectively welded with horizontally arranged first support brackets 391, the first support bracket 391 is a wedge-shaped structure, the upper surface of the first support bracket 391 is parallel to the horizontal plane and serves as a load-bearing node of the horseway 5.

[0038] For further information, please refer to Figure 5The first connecting beam 33 includes two first positioning diagonal braces 331, a first positioning crossbeam 332 and two first arc-shaped groove plates 333; wherein the chord rod is positioned and fixed by the two first arc-shaped groove plates 333 of the first connecting beam 33; the two first positioning diagonal braces 331 are arranged in an eight-shape and are respectively connected to the corresponding first branches 32; the first positioning crossbeam 332 is installed on the two first positioning diagonal braces 331; the two first arc-shaped groove plates 333 are installed on the first positioning crossbeam 332 at intervals, and both extend along the width direction of the large-span folded arch truss 1 to be assembled; the first arc-shaped groove plate 333 is used to support the chord rod in the large-span folded arch truss 1 to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the chord rod to be assembled; the first fixed beam 39 and the first positioning diagonal brace 331 are respectively located at opposite sides of the first branch 32, and intersect at the same node position of the first branch 32.

[0039] Please refer to Figure 7 The adjustable support assembly 36 includes a base 361, a jack 362, a bracket 363, a connecting beam 364 and a saddle 365; the base 361 and the jack 362 are respectively arranged on the first main roadbed box 34, and the jacks 362 are respectively located on the opposite sides of the base 361, for lifting and adjusting the height of the connecting beam 364, thereby adjusting the spatial position of the large-span folded arch truss 1; the bracket 363 is installed on the base 361 by a plurality of bolts; the connecting beam 364 is horizontally welded to the top of the bracket 363 The saddle 365 includes a base plate, two trapezoidal arc plates and reinforcing ribs, and the base plate is mounted on the connecting beam 364. The two trapezoidal arc plates are installed on the base plate in parallel and at intervals and extend along the width direction of the large-span folded arch truss 1 to be assembled. The reinforcing ribs are connected between the two trapezoidal arc plates. The trapezoidal arc plate is used to support the lower chord of the large-span folded arch truss 1 to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the lower chord to be assembled.

[0040] Please refer to Figure 6The first branch 32 includes a first sub-adjusting beam 321, a first sub-hanging ear 322, a first sub-column 323, two first sub-straight braces 324 and two first sub-corbels 325; the axial direction of the first sub-adjusting beam 321 is parallel to the axial direction of the large-span folded arch truss 1 to be assembled; the first sub-column 323 is vertically fixed to the middle part of the first sub-adjusting beam 321; the first sub-hanging ear 322 is provided at the lower part of the first sub-column 323; the two first sub-corbels 325 are respectively welded to the opposite sides of the upper part of the first sub-column 323, and are both parallel to the first sub-adjusting beam 321; the two first sub-straight braces 324 are respectively provided on both sides of the first sub-column 323, and the two ends of each first sub-straight brace 324 are respectively connected between the top of the first sub-adjusting beam 321 and the bottom of the first sub-corbel 325.

[0041] Please refer to Figure 9 , the first main limb 35 includes a first main adjusting beam 351, a first main lifting ear 352, a first main column 353, two first main diagonal braces 354, two first main corbels 355, a first diagonal brace 356, a first supporting beam 357 and a first arc-shaped groove plate 358; wherein, the axial direction of the first main adjusting beam 351 is parallel to the axial direction of the large-span folded arch truss 1 to be assembled; the first main column 353 is vertically fixed to the middle part of the first main adjusting beam 351; the first main lifting ear 352 is provided at the lower part of the first main column 353; the two first main corbels 355 are respectively welded to the opposite sides of the upper part of the first main column 353, and are both parallel to the first main adjusting beam 351; the two first main diagonal braces 354 are respectively provided on both sides of the first main column 353, and each first main corbel 355 is parallel to the first main adjusting beam 351; the two first main diagonal braces 354 are respectively provided on both sides of the first main column 353, and each first main The two ends of a main diagonal brace 354 are respectively connected between the top of the first main adjusting beam 351 and the bottom of the first main corbel 355; the first diagonal brace 356 is arranged at an angle and connected to one side of the first main column 353; the first supporting beam 357 is welded to the first diagonal brace 356; the first arc-shaped groove plate 358 is installed on the first supporting beam 357 and extends along the width direction of the large-span folded arch truss 1 to be assembled; the first arc-shaped groove plate 358 is used to support the upper chord of the large-span folded arch truss 1 to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the upper chord to be assembled; the first fixed beam 39 and the first diagonal brace 356 are respectively located on opposite sides of the first main column 353, and intersect at the same node position of the first main column 353.

[0042] By inserting gaskets of different thicknesses between the first branch limb 32 and the first branch roadbed box 31, the verticality, horizontality and height of the first branch limb 32 on the first branch roadbed box 31 can be adjusted; by inserting gaskets of different thicknesses between the first main limb 35 and the first main roadbed box 34, the verticality, horizontality and height of the first main limb 35 on the first main roadbed box 34 can be adjusted; by inserting gaskets of different thicknesses between the adjustable support assembly 36 and the first main roadbed box 34, the verticality, horizontality and height of the adjustable support assembly 36 on the first main roadbed box 34 can be adjusted.

[0043] Please refer to Figure 4 The second tire frame unit 4 includes a second branch roadbed box 41, a second branch limb 42, a second connecting beam 43, a second main roadbed box 44, a second main limb 45, a supporting beam 46, a second connecting beam 47, a second cable 48 and a second fixed beam 49; wherein, the second branch roadbed boxes 41 extend along the width direction of the large-span folding arch truss 1 to be assembled; the extension direction of the second main roadbed box 44 is perpendicular to the extension direction of the second branch roadbed box 41, and the second main roadbed box 44 is located between the two second branch roadbed boxes 41; at the same time, the second branch limb 42 and the second main limb 45 extend along the span direction of the large-span folding arch truss 1 to be assembled, and the height of the second branch limb 42 is lower than the height of the second main limb 45; the two second branches 42 are vertically installed on the second branch roadbed box 41 in parallel and at intervals, and the second connecting beam 43 is welded to the two second branches 42 between the upper parts; the two second main limbs 45 are vertically installed on the second main roadbed box 44 in parallel and at intervals, and the two ends of the support beam 46 are respectively connected between the middle parts of the two second main limbs 45; the two ends of the second connecting beam 47 are respectively welded between the adjacent second main roadbed box 44 and the second branch roadbed box 41; the two ends of a plurality of second cables 48 are respectively connected between the adjacent second branches 42 and the second main limbs 45 through ear plates and pins; the second fixed beam 49 is inclined and is above the second cable 48, and the two ends are respectively connected between the adjacent second branches 42 and the second main limbs 45 through multiple bolts; the top surfaces of the two ends of the second fixed beam 49 are respectively fixed with horizontally arranged second support brackets 491, the second support bracket 491 is a wedge-shaped structure, and the upper surface of the second support bracket 491 is parallel to the horizontal plane and serves as a load-bearing node of the horseway 5.

[0044] Please refer to Figure 10The second connecting beam 43 includes two second positioning diagonal braces, a second positioning crossbeam and two second arc-shaped groove plates; the two second positioning diagonal braces are arranged in an eight-shaped shape and are respectively connected to the corresponding second branches 42; the second positioning crossbeam is welded to the two second positioning diagonal braces; the two second arc-shaped groove plates are welded to the second positioning crossbeam at intervals and extend along the width direction of the large-span folded arch truss 1 to be assembled; the second arc-shaped groove plate is used to support the chord rod of the large-span folded arch truss 1 to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the chord rod to be assembled; the second fixed beam 49 and the second positioning diagonal brace are respectively located at the second branches 42 On opposite sides of the second branch 42, and intersect at the same node position of the second branch 42; the support beam 46 includes two connecting diagonal braces 461, a fixed crossbeam 462 and an arc-shaped groove plate 463; the two connecting diagonal braces 461 are arranged in an eight-shaped shape and are respectively connected to the corresponding second branch 42; the fixed crossbeam 462 is welded to the two connecting diagonal braces 461; the arc-shaped groove plate 463 is welded to the fixed crossbeam 462, and both extend along the width direction of the large-span folded arch truss 1 to be assembled; the arc-shaped groove plate 463 is used to support the lower chord of the large-span folded arch truss 1 to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the lower chord to be assembled.

[0045] The second branch 42 includes a second sub-adjusting beam, a second sub-hanging ear, a second sub-column, two second sub-slanting braces and two second sub-corbels; the axial direction of the second sub-adjusting beam is parallel to the axial direction of the large-span folded arch truss 1 to be assembled; the second sub-column is vertically fixed to the middle part of the second sub-adjusting beam; the second sub-hanging ear is provided at the lower part of the second sub-column; the two second sub-corbels are respectively welded to the opposite sides of the upper part of the second sub-column, and are both parallel to the second sub-adjusting beam; the two second sub-slanting braces are respectively provided on both sides of the second sub-column, and the two ends of each second sub-slanting brace are respectively connected between the top of the second sub-adjusting beam and the bottom of the second sub-corbel.

[0046] The second main limb 45 includes a second main adjustment beam, a second main lifting ear, a second main column, two second main diagonal braces, two second main corbels, a second diagonal brace, a second supporting beam and a second arc-shaped groove plate; the axial direction of the second main adjustment beam is parallel to the axial direction of the large-span folded arch truss 1 to be assembled; the second main column is vertically fixed to the middle part of the second main adjustment beam; the second main lifting ear is provided at the lower part of the second main column; the two second main corbels are respectively welded to the opposite sides of the upper part of the second main column and are parallel to the second main adjustment beam; the two second main diagonal braces are respectively provided on both sides of the second main column, and the two ends of each second main diagonal brace are respectively connected Between the top of the second main adjusting beam and the bottom of the second main corbel; the second diagonal brace is inclined, and one end is connected to one side of the second main column; the second supporting beam is welded to the second diagonal brace; the second arc-shaped groove plate is installed on the second supporting beam and extends along the width direction of the large-span folded arch truss 1 to be assembled; the second arc-shaped groove plate is used to support the upper chord of the large-span folded arch truss 1 to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the upper chord to be assembled; the second fixed beam 49 and the second diagonal brace are respectively located on opposite sides of the second main column, and intersect at the same node position of the second main column.

[0047] By inserting gaskets of different thicknesses between the second branch limb 42 and the second branch roadbed box 41, the verticality, horizontality and height of the second branch limb 42 on the second branch roadbed box 41 can be adjusted; by inserting gaskets of different thicknesses between the second main limb 45 and the second main roadbed box 44, the verticality, horizontality and height of the second main limb 45 on the second main roadbed box 44 can be adjusted.

[0048] It should be noted that the first main roadbed box 34, the first main limb 35, and the adjustable support assembly 36 together constitute the first main gate type unit, and the first branch roadbed box 31, the first branch limb 32, and the first connecting beam 33 together constitute the first branch gate type unit; the second main roadbed box 44, the second main limb 45, and the support beam 46 together constitute the second main gate type unit 7, and the second branch roadbed box 41, the second branch limb 42, and the second connecting beam 43 together constitute the second branch gate type unit 6.

[0049] Since the large-span folded arch truss 1 includes five chords, a group of first sub-door units are symmetrically arranged on both sides of the first main door unit to support the wing trusses 12 on both sides of the main truss 11; the first main door unit and the first sub-door unit are connected as a whole through the first connecting beam 37 to maintain their plane stability; at the same time, the positions of the first connecting beam 33 and the adjustable support assembly 36 are determined according to the elevation of the chord, and a first arc-shaped groove plate 333 is provided on the first connecting beam 33 to support the chord, and a saddle 365 is provided on the adjustable support assembly 36 to support the chord. Furthermore, a set of second sub-door units 6 are symmetrically arranged on either side of the second main door unit 7, supporting the wing trusses 12 on either side of the main truss 11. The second main door unit 7 and the second sub-door unit 6 are connected as a whole by a second connecting beam 47, thereby maintaining their planar stability. Simultaneously, the positions of the second connecting beam 43 and the support beam 46 are determined based on the elevation of the chord, and a second arc-shaped groove plate is provided on the second connecting beam 43 to support the chord, while an arc-shaped groove plate 463 is provided on the support beam 46 to support the chord. Furthermore, because the span, width, and weight of the large-span folded arch truss 1 are all relatively large in domestic spatial truss structures, especially its extremely wide width, to maintain the overall planar stability and bearing capacity of the frame unit, a first fixed beam 39 is provided between the first main door unit and the first sub-door unit, and a second fixed beam 49 is provided between the second main door unit 7 and the second sub-door unit 6. Because the rise of the large-span folded arch truss 1 is 6 meters, and assembly still requires overhead work, a bridleway 5 is installed on each of the first and second frame units 3 and 4. To avoid spatial interference between the bridleway 5 and the web members of the large-span folded arch truss 1, the bridleway 5's bearing points are located on the first fixed beams 39 of the first main gate unit and the first sub-gate unit, and on the second fixed beams 49 of the second main gate unit 7 and the second sub-gate unit 6. Therefore, both the first and second fixed beams 39 and 49 are rigid structures. To reduce the steel consumption of the first and second frame units 3 and 4, and to facilitate their installation, disassembly, and turnover, the existing connecting beams in the middle and lower portions of the first main gate unit and the first sub-gate unit are replaced with first cables 38 for prestressing. The existing connecting beams in the middle and lower portions of the second main gate unit 7 and the second sub-gate unit 6 are replaced with second cables 48 for prestressing.In order to increase the effective space during the assembly of the web members of the main truss 11, the first arc-shaped groove plate 333 is arranged on the inner side of the first separate column 323, thereby increasing the distance between the first separate columns 323; the first arc-shaped groove plate 358 is arranged on the inner side of the first main column 353, thereby increasing the distance between the first main columns 353; the second arc-shaped groove plate is arranged on the inner side of the second separate column, thereby increasing the distance between the second separate columns; the arc-shaped groove plate 463 is arranged on the inner side of the second main column, thereby increasing the distance between the second main columns.

[0050] It should be further explained that the first arc-shaped groove plate 333, the second arc-shaped groove plate, the first arc-shaped groove plate 358, the second arc-shaped groove plate, and the arc-shaped groove plate 463 are all arc plates, and the chords of the large-span folded arch truss 1 are respectively positioned and fixed by them, and the arc edge diameter of the arc plate is 1~3mm larger than the diameter of the corresponding chord; the arc edge diameter of the trapezoidal arc plate of the saddle 365 is 1~3mm larger than the diameter of the corresponding chord. Due to the manufacturing deviation of the chord rod, and the first arc-shaped groove plate 333, the second arc-shaped groove plate, the first arc-shaped groove plate 358, the second arc-shaped groove plate, and the arc-shaped groove plate 463 are all laser-cut with extremely high precision, the outer diameters of all chord rods cannot be fully adapted to the inner diameters of the first arc-shaped groove plate 333, the second arc-shaped groove plate, the first arc-shaped groove plate 358, the second arc-shaped groove plate, and the arc-shaped groove plate 463. Therefore, the diameters of the arc edges of the first arc-shaped groove plate 333, the second arc-shaped groove plate, the first arc-shaped groove plate 358, the second arc-shaped groove plate, and the arc-shaped groove plate 463 are increased to avoid interference with the corresponding chord rod.

[0051] It should be noted that the adjustable support assembly 36 is bolted to the first main limb 35, the first main limb 35 is bolted to the first fixed beam 39, the first branch 32 is bolted to the first fixed beam 39, and the first cable 38 is respectively connected to the first main limb 35 and the first branch 32 through the ear plate pin; the second main limb 45 is bolted to the second fixed beam 49, the second branch 42 is bolted to the second fixed beam 49, and the second cable 48 is respectively connected to the second main limb 45 and the second branch 42 through the ear plate pin; the bracket 363 is bolted to the base 361.

[0052] By inserting gaskets of different thicknesses between the first sub-adjustment beam 321 and the first sub-roadbed box 31, the first main adjustment beam 351 and the first main roadbed box 34, the base 361 and the first main roadbed box 34, the second sub-adjustment beam and the second sub-roadbed box 41, and the second main adjustment beam and the second main roadbed box 44, respectively, to adjust the spatial positions of the first main door-type unit, the first sub-door-type unit, the second main door-type unit 7, and the second sub-door-type unit 6, it can be effectively ensured that the first arc-shaped groove plate 333, the first arc-shaped groove plate 358, the second arc-shaped groove plate, the second arc-shaped groove plate, the arc-shaped groove plate 463, and the saddle 365 are in spatial coordinate positions adapted to the corresponding chord rods. This adjustment method is simple to operate and has high applicability. In order to achieve non-destructive disassembly of the first fixed beam 39 and the second fixed beam 49, they are designed to be bolted to the first sub-column 323, the first main column 353, the second sub-column, and the second main column. To achieve the goal of spatially adjusting the position of the large-span folded arch truss 1 after assembly and welding, the adjustable support assembly 36 is designed to be bolted to the first main limb 35, allowing the installation of a jack 362 to lift the connecting crossbeam 364. In addition, the remaining structures in the first and second frame units 3 and 4 can be welded. By combining the rigid (welded) and flexible (bolted) structures in the first and second frame units 3 and 4, the assembly device 2 for the large-span folded arch truss can be spatially adjusted while maximizing the overall strength, rigidity, and stability of the structure. This solves the problem of insufficient bearing capacity of existing truss frames supporting large-tonnage, large-span, complex spatial trusses, resulting in tilting, displacement, and deformation during truss assembly. This significantly improves the assembly accuracy of large-tonnage, large-span, complex spatial trusses.

[0053] At the same time, support systems are designed at both ends of the large-span folded arch truss 1, making assembly accuracy at both ends particularly important. Large-span spatial trusses are heavy, and after forming, their overall spatial position cannot be adjusted using existing assembly cradles. Therefore, two jacks 362 are installed at the bottom of the connecting crossbeam 364. During assembly, the truss's weight is supported by a base 361 and a bracket 363. After forming, the truss is lifted at multiple points using the four jacks 362 at each end, allowing for adjustment of the spatial position of the entire truss, achieving high-precision construction.

[0054] The adjustable support assembly 36 is located at a relatively low elevation, so the lower portion of the connecting crossbeam 364 in the adjustable support assembly 36 is not supported by a diagonal brace. Instead, a bracket 363 and a base 361 are provided at the lower center of the connecting crossbeam 364. The first fixed beam 39, connected at a corresponding elevation to the first positioning diagonal brace 331, can offset the lateral force generated by the first positioning diagonal brace 331 under the deadweight of the truss.

[0055] By setting a first sub-lifting ear 322 at the bottom of the first sub-column 323 and a first main lifting ear 352 at the bottom of the first main column 353, they serve as lifting points for the first sub-door type unit and the first main door type unit; by setting a second sub-lifting ear at the bottom of the second sub-column and a second main lifting ear at the bottom of the second main column, they serve as lifting points for the second sub-door type unit 6 and the second main door type unit 7; since the center of gravity of the first sub-door type unit and the first main door type unit are both located at the bottom close to the first sub-roadbed box 31 and the first main roadbed box 34, the first sub-lifting ear 322 is set at the bottom of the first sub-column 323 and the first main lifting ear 352 is set at the bottom of the first main column 353, which can maintain the stability of the components during the lifting process.

[0056] Each component of the assembly device 2 for the large-span folding arch truss is made of profiles and steel plates. Therefore, finite element analysis software is used to calculate the strength, stiffness, and stability of each component of the assembly device 2 for the large-span folding arch truss. The cross-sections and distribution quantities of each component in the first tire frame unit 3, the second tire frame unit 4, and the horseway 5 are optimized and iteratively calculated until the stress ratio of each component in the first tire frame unit 3, the second tire frame unit 4, and the horseway 5 is between 0.8-0.85 and the maximum deformation value is within 5mm. By using the existing stress analysis iterative calculation method to determine the cross-section and distribution quantity of each component in the assembly device 2 for the large-span folding arch truss, the problem of high cost of measures caused by the large cross-sections of existing truss tire frame components is solved, greatly reducing construction costs.

[0057] Second embodiment: Please refer to Figure 11 , with reference Figures 12 to 16 In this embodiment, a method for installing and disassembling a large-span folded arch truss assembly device 2 is provided, which mainly includes the following steps: S1, component factory divisional production: the first sub-roadbed box 31, the first branch limb 32, the first connecting beam 33, the first main roadbed box 34, the first main limb 35, the adjustable support assembly 36, the first connecting beam 37, the first cable 38, and the first fixed beam 39 in the first tire frame unit 3 are respectively manufactured as individual sub-components and transported to the site; the second sub-roadbed box 41, the second branch limb 42, the second connecting beam 43, the second main roadbed box 44, the second main limb 45, the supporting beam 46, the second connecting beam 47, the second cable 48, and the second fixed beam 49 in the second tire frame unit 4 are respectively manufactured as individual sub-components and transported to the site; the horseway 5 is manufactured as individual sub-components and transported to the site; S2, first installation on site: according to the projection position of the large-span folded arch truss 1 on the ground, mark out the lines, place the first branch roadbed box 31, the first main roadbed box 34, the second branch roadbed box 41, and the second main roadbed box 44, and connect the adjacent first branch roadbed boxes 31 and the first main roadbed boxes 34 in each group of first tire frame units 3 through the first connecting beam 37, and connect the adjacent second branch roadbed boxes 41 and the second main roadbed boxes 44 in each group of second tire frame units 4 through the second connecting beam 47; install the first branch limb 32 on the first branch roadbed box 31, the first main limb 35 on the first main roadbed box 34, and the second main limb 36 on the second main roadbed box 37. The second branch 42 is installed on the branch roadbed box 41, and the second main limb 45 is installed on the second main roadbed box 44; a gasket is inserted between the first sub-adjusting beam 321 of the first branch 32 and the first branch roadbed box 31 to adjust the verticality, horizontality and height of the first branch 32, and the first connecting beam 33 is installed between the two first branches 32; a gasket is inserted between the first main adjusting beam 351 of the first main limb 35 and the first main roadbed box 34 to adjust the verticality, horizontality and height of the first main limb 35, and the adjustable support assembly 36 is installed between the two first main limbs 35; Insert a gasket between the first and second sub-adjusting beams 42 and the second sub-roadbed box 41 to adjust the verticality, horizontality and height of the first connecting beam 33; insert a gasket between the base 361 of the adjustable support assembly 36 and the first main roadbed box 34 to adjust the verticality, horizontality and height of the adjustable support assembly 36; install a first fixed beam 39 and a first cable 38 between the first branch 32 and the first main limb 35, and apply prestress to the first cable 38; insert a gasket between the second sub-adjusting beam of the second branch 42 and the second sub-roadbed box 41 to adjust the verticality, horizontality and height of the second branch 42, and install a second connecting beam 43 between the two second branches 42; Insert shims between the second main adjustment beam of the 45 and the second main roadbed box 44 to adjust the verticality, horizontality, and height of the second main limb 45, and install the support beam 46 between the two second main limbs 45; insert shims between the second sub-adjustment beam of the second branch limb 42 and the second branch roadbed box 41 to adjust the verticality, horizontality, and height of the second connecting beam 43; insert shims between the second main adjustment beam of the second main limb 45 and the second main roadbed box 44 to adjust the support beam 46; install the second fixed beam 49 and the second cable 48 between the second branch limb 42 and the second main limb 45, and apply prestress to the second cable 48; install the bridle 5; S3, first disassembly on site: after the multiple large-span folding arch trusses 1 are assembled, welded and lifted in situ, the assembly device 2 for disassembling the large-span folding arch trusses is transferred to the projection position of the multiple large-span folding arch trusses 1 to be assembled later on the ground; when the large-span folding arch trusses 1 are disassembled by the assembly device, the second main door unit 7 composed of the second main roadbed box 44, the second main limb 45 and the support beam 46 is hoisted and disassembled as a whole. Unloading and transporting: hoisting, disassembling and transporting the second sub-gate unit 6 composed of the second sub-roadbed box 41, the second branch limb 42 and the second connecting beam 43 as a whole; hoisting, disassembling and transporting the first main gate unit composed of the first main roadbed box 34, the first main limb 35 and the adjustable support assembly 36 as a whole; hoisting, disassembling and transporting the first sub-gate unit composed of the first sub-roadbed box 31, the first branch limb 32 and the first connecting beam 33 as a whole; S4, second installation on site: the projection positions of the subsequent multiple large-span folded arch trusses 1 on the ground are marked and laid out, and multiple groups of first main door type units, first branch door type units, second main door type units 7, and second branch door type units 6 are installed; shims are inserted between the first branch adjustment beam 321 and the first branch roadbed box 31 to adjust the verticality, horizontality, and height of the first connecting beam 33; shims are inserted between the base 361 and the first main roadbed box 34 to adjust the verticality, horizontality, and height of the adjustable support assembly 36. Insert shims between the second sub-adjustment beam and the second sub-roadbed box 41 to adjust the verticality, horizontality, and height of the second connecting beam 43; insert shims between the second main adjustment beam and the second main roadbed box 44 to adjust the verticality, horizontality, and height of the support beam 46; install the first fixed beam 39 and the first cable 38 between the first branch 32 and the first main limb 35 and apply prestress; install the second fixed beam 49 and the second cable 48 between the second branch 42 and the second main limb 45 and apply prestress; install the bridleway 5; S5, repeating the steps from S3 to S4 on site to circulate the assembly device 2 for the large-span folded arch truss.

[0058] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An assembly device for a large-span folded arch truss, characterized in that: It includes a first tire frame unit, a second tire frame unit and a horse track; The first tire frame units and the second tire frame units are arranged in parallel and spaced apart along the span direction of the large-span folding arch truss to be assembled, each group of the first tire frame units and each group of the second tire frame units extend along the width direction of the large-span folding arch truss, and the first tire frame units are respectively arranged at both ends of the large-span folding arch truss to be assembled, and multiple groups of the second tire frame units are located between the first tire frame units at both ends; the height of the second tire frame units gradually decreases from the middle of the large-span folding arch truss to be assembled toward the end, and the height of the first tire frame units is the lowest; Multiple groups of the horseways are arranged at intervals along the width direction of the large-span folded arch truss to be assembled, and each group of the horseways extends along the span direction of the large-span folded arch truss and is connected to the first tire frame unit and the second tire frame unit respectively.

2. The assembly device for large-span folded arch trusses according to claim 1, characterized in that: The large-span folded arch truss includes a plurality of chords arranged at intervals along the width direction and extending along the span direction, and each of the chords is divided into a plurality of segmented sections connected in sequence; a group of the second tire frame units are arranged at each end of the segmented sections at the middle position, and a group of the second tire frame units or a group of the first tire frame units are arranged at one end of the segmented sections at other positions.

3. The assembly device for large-span folded arch trusses according to claim 1, characterized in that: The first tire frame unit includes a first branch roadbed box, a first branch, a first connecting beam, a first main roadbed box, a first main limb, an adjustable support assembly, a first connecting beam, a first cable and a first fixed beam; the first branch roadbed box and the first main roadbed box are arranged at intervals along the width direction of the large-span folding arch truss to be assembled, and both extend along the width direction of the large-span folding arch truss to be assembled, and the first main roadbed box is located between the two first branch roadbed boxes; the first branch and the first main limb both extend along the span direction of the large-span folding arch truss to be assembled, and the height of the first branch is lower than the height of the first main limb; the two first branches are installed on the first branch roadbed box in parallel and at intervals, and the first connecting beam is connected to the two first between the upper parts of the limbs; the two first main limbs are installed on the first main roadbed box in parallel and at intervals, the adjustable support assembly is installed on the first main roadbed box, and the two ends are connected to the lower parts of the two first main limbs by multiple bolts; the two ends of the first connecting beam are respectively welded between the adjacent first main roadbed box and the first branch roadbed box; the two ends of the first cable are respectively connected to the adjacent first limbs and the first main limbs by ear plates and pins; the first fixed beam is inclined and is above the first cable, and the two ends are respectively connected to the adjacent first limbs and the first main limbs by multiple bolts; horizontally arranged first support brackets are welded on the top surfaces of both ends of the first fixed beam for supporting the horseway.

4. The assembly device for a large-span folded arch truss according to claim 3, characterized in that: The first connecting beam includes two first positioning braces, a first positioning crossbeam and two first arc-shaped groove plates; the two first positioning braces are arranged in an eight-shaped shape and are respectively connected to the corresponding first branches; the first positioning crossbeam is installed on the two first positioning braces; the two first arc-shaped groove plates are installed on the first positioning crossbeam at intervals and extend along the width direction of the large-span folded arch truss to be assembled; the first arc-shaped groove plate is used to support the chord rod of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the chord rod to be assembled; the first fixed beam and the first positioning brace are respectively located at opposite sides of the first branch and intersect at the same node position of the first branch; the adjustable support assembly includes a base, a jack, a bracket, a connecting rod, a connecting rod, a connecting rod, a connecting rod, a connecting rod, a connecting rod, a connecting rod, a connecting rod, a connecting rod, a connecting rod Connecting beam and saddle; the base and the jack are respectively arranged on the first main roadbed box, and the jack is used to lift and adjust the height of the connecting beam; the bracket is installed on the base by multiple bolts; the connecting beam is horizontally welded to the top of the bracket, and the two ends are connected between the lower parts of the two first main limbs by multiple bolts; the saddle includes a base plate, two trapezoidal arc plates and reinforcing ribs, the base plate is installed on the connecting beam, the two trapezoidal arc plates are installed on the base plate in parallel and at intervals and both extend along the width direction of the large-span folded arch truss to be assembled, and the reinforcing ribs are connected between the two trapezoidal arc plates; the trapezoidal arc plate is used to support the lower chord of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the lower chord to be assembled.

5. The assembly device for large-span folded arch trusses according to claim 3, characterized in that: The first branch comprises a first sub-adjusting beam, a first sub-lifting ear, a first sub-column, two first sub-bracings and two first sub-corbels; the axial direction of the first sub-adjusting beam is parallel to the axial direction of the large-span folded-surface arch truss to be assembled; the first sub-column is vertically fixed to the middle part of the first sub-adjusting beam; the first sub-lifting ear is arranged at the lower part of the first sub-column; the two first sub-corbels are respectively welded at opposite sides of the upper part of the first sub-column and are parallel to the first sub-adjusting beam; the two first sub-bracings are respectively arranged on both sides of the first sub-column, and the two ends of each first sub-bracing are respectively connected between the top of the first sub-adjusting beam and the bottom of the first sub-corbel; the first main limb comprises a first main adjusting beam, a first main lifting ear, a first main column, two first main diagonal braces, two first main corbels, a first diagonal brace, a first supporting beam and a first arc-shaped groove plate; the axial direction of the first main adjusting beam is parallel to the axial direction of the large-span folded-surface arch truss to be assembled; the first main column is vertically fixed to the first the first main bracket is welded to the upper part of the first main column, and the first main bracket is welded to the upper part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the lower part of the first main column, and the first main bracket is welded to the upper ...

6. The assembly device for large-span folded arch trusses according to claim 3, characterized in that: By inserting gaskets of different thicknesses between the first branch and the first branch roadbed box, the verticality, horizontality and height of the first branch are adjusted; by inserting gaskets of different thicknesses between the first main limb and the first main roadbed box, the verticality, horizontality and height of the first main limb are adjusted; by inserting gaskets of different thicknesses between the adjustable support assembly and the first main roadbed box, the verticality, horizontality and height of the adjustable support assembly are adjusted.

7. The assembly device for a large-span folded arch truss according to claim 1, characterized in that: The second tire frame unit includes a second branch roadbed box, a second branch, a second connecting beam, a second main roadbed box, a second main limb, a supporting beam, a second connecting beam, a second cable and a second fixed beam; the second branch roadbed boxes extend along the width direction of the large-span folding arch truss to be assembled; the extension direction of the second main roadbed box is perpendicular to the extension direction of the second branch roadbed box, and the second main roadbed box is located between the two second branch roadbed boxes; the second branch and the second main limb extend along the span direction of the large-span folding arch truss to be assembled, and the height of the second branch is lower than the height of the second main limb; the two second branches are connected to the second branch roadbed box in parallel and at intervals, and the second connecting beam is welded Between the upper parts of the two second limbs; the two second main limbs are connected to the second main roadbed box in parallel and at intervals, and the two ends of the support beam are respectively connected between the middle parts of the two second main limbs; the two ends of the second connecting beam are respectively welded between the adjacent second main roadbed box and the second branch roadbed box; the two ends of multiple second cables are respectively connected between the adjacent second limbs and the second main limbs through ear plates and pins; the second fixed beam is arranged obliquely and is above the second cable, and the two ends are respectively connected to the adjacent second limbs and the second main limbs through multiple bolts; the top surfaces of the two ends of the second fixed beam are respectively fixed with horizontally arranged second support brackets for supporting the horseway.

8. The assembly device for a large-span folded arch truss according to claim 7, characterized in that: The second connecting beam includes two second positioning diagonal braces, a second positioning crossbeam and two second arc-shaped groove plates; the two second positioning diagonal braces are arranged in an eight-shaped shape and are respectively connected to the corresponding second branches; the second positioning crossbeam is welded to the two second positioning diagonal braces; the two second arc-shaped groove plates are welded to the second positioning crossbeam at intervals and extend along the width direction of the large-span folded surface arch truss to be assembled; the second arc-shaped groove plate is used to support the chord rod of the large-span folded surface arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the chord rod to be assembled; the second fixed beam and the second The positioning diagonal braces are respectively located at opposite sides of the second branch and intersect at the same node position of the second branch; the support beam includes two connecting diagonal braces, a fixed crossbeam and an arc-shaped groove plate; the two connecting diagonal braces are arranged in an eight-shape and are respectively connected to the corresponding second branches; the fixed crossbeam is welded to the two connecting diagonal braces; the arc-shaped groove plate is welded to the fixed crossbeam and extends along the width direction of the large-span folded arch truss to be assembled; the arc-shaped groove plate is used to support the lower chord of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the lower chord to be assembled.

9. The assembly device for a large-span folded arch truss according to claim 7, characterized in that: The second branch comprises a second branch adjusting beam, a second branch lifting ear, a second branch column, two second branch diagonal braces and two second branch legs; the axial direction of the second branch adjusting beam is parallel to the axial direction of the large-span folded surface arch truss to be assembled; the second branch column is vertically fixed to the middle of the second branch adjusting beam; the second branch lifting ear is provided at the lower part of the second branch column; the two second branch legs are respectively welded at the opposite sides of the upper part of the second branch column, and are both parallel to the second branch adjusting beam; the two second branch diagonal braces are respectively provided on both sides of the second branch column, and the two ends of each second branch diagonal brace are respectively connected between the top of the second branch adjusting beam and the bottom of the second branch leg; the second main limb comprises a second main adjusting beam, a second main lifting ear, a second main column, two second main diagonal braces, two second main legs, a second diagonal brace, a second supporting beam and a second arc-shaped groove plate; the axial direction of the second main adjusting beam is parallel to the axial direction of the large-span folded surface arch truss to be assembled; the second main column is vertically fixed to the second The middle part of the main adjustment beam; the second main lifting ear is provided at the lower part of the second main column; the two second main brackets are respectively welded to the opposite sides of the upper part of the second main column and are parallel to the second main adjustment beam; the two second main diagonal braces are respectively provided on both sides of the second main column, and the two ends of each second main diagonal brace are respectively connected between the top of the second main adjustment beam and the bottom of the second main bracket; the secondary diagonal brace is inclined, and one end is connected to one side of the second main column; the second supporting crossbeam is welded to the secondary diagonal brace; the second arc-shaped groove plate is installed on the second supporting crossbeam and is arranged along the width direction of the large-span folded arch truss to be assembled; the second arc-shaped groove plate is used to support the upper chord of the large-span folded arch truss to be assembled, and the arc edge diameter is 1~3mm larger than the diameter of the upper chord to be assembled; the second fixed beam and the second diagonal brace are respectively located at opposite sides of the second main column and intersect at the same node position of the second main column.

10. The assembly device for large-span folded arch trusses according to claim 7, characterized in that: By inserting gaskets of different thicknesses between the second branch limb and the second branch roadbed box, the verticality, horizontality and height of the second branch limb can be adjusted; by inserting gaskets of different thicknesses between the second main limb and the second main roadbed box, the verticality, horizontality and height of the second main limb can be adjusted.

11. The assembly device for a large-span folded arch truss according to claim 1, characterized in that: The strength, stiffness and stability of the assembly device for the large-span folded arch truss are calculated using finite element analysis software, and the cross-sections and distribution quantities of the first tire frame unit, the second tire frame unit and the various components in the horseway are optimized and iteratively calculated to ensure that the stress ratio of the first tire frame unit, the second tire frame unit and the various components in the horseway is between 0.8-0.85 and the maximum deformation value is within 5mm.

12. A method for installing and disassembling a large-span folded arch truss assembly device according to any one of claims 1 to 11, characterized in that: The following steps are involved: S1, component factory divisional production: the first sub-roadbed box, the first branch, the first connecting beam, the first main roadbed box, the first main limb, the adjustable support assembly, the first connecting beam, the first cable, and the first fixed beam in the first tire frame unit are respectively produced as individual sub-components and transported to the site; the second sub-roadbed box, the second branch, the second connecting beam, the second main roadbed box, the second main limb, the support beam, the second connecting beam, the second cable, and the second fixed beam in the second tire frame unit are respectively produced as individual sub-components and transported to the site; the bridleway is produced as individual sub-components and transported to the site; S2, first installation on site: according to the projection position of the large-span folded arch truss on the ground, mark out and lay out the first branch roadbed box, the first main roadbed box, the second branch roadbed box, and the second main roadbed box, and connect the adjacent first branch roadbed boxes and the first main roadbed box in each group of the first tire frame units through the first connecting beam, and connect the adjacent second branch roadbed boxes and the second main roadbed box in each group of the second tire frame units through the second connecting beam; install the first branch on the first branch roadbed box, install the second branch on the first main roadbed box, and the first branch on the first main roadbed box. The first main limb is installed, the second branch limb is installed on the second branch roadbed box, and the second main limb is installed on the second main roadbed box; a shim is inserted between the first branch adjustment beam of the first branch limb and the first branch roadbed box to adjust the first branch limb, and a first connecting beam is installed between the two first branch limbs; a shim is inserted between the first main adjustment beam of the first main limb and the first main roadbed box to adjust the first main limb, and an adjustable support assembly is installed between the two first main limbs; a shim is inserted between the first branch adjustment beam and the first branch roadbed box to adjust the first connecting beam; Insert a shim between the base of the adjustable support assembly and the first main roadbed box to adjust the adjustable support assembly; install a first fixed beam and a first cable between the first branch and the first main limb, and apply prestress to the first cable; insert a shim between the second branch adjustment beam of the second branch and the second branch roadbed box to adjust the second branch, and install a second connecting beam between the two second branches; insert a shim between the second main adjustment beam of the second main limb and the second main roadbed box to adjust the second main limb, and install a support beam between the two second main limbs; Inserting a shim between the second sub-adjustment beam of the second limb and the second sub-roadbed box to adjust the second connecting beam; inserting a shim between the second main adjustment beam of the second main limb and the second main roadbed box to adjust the supporting beam; Installing a second fixing beam and a second cable between the second branch and the second main limb, applying prestress to the second cable; installing the bridleway; S3, first disassembly on site: after the in-situ assembly, welding and lifting of the plurality of large-span folding arch trusses are completed, the assembly device for the large-span folding arch trusses is disassembled and transferred to the projection position of the plurality of large-span folding arch trusses to be assembled subsequently on the ground; wherein, when the assembly device for the large-span folding arch trusses is disassembled, the second main door-type unit composed of the second main roadbed box, the second main limb and the support beam is hoisted, disassembled and transported as a whole; the second branch door-type unit composed of the second branch roadbed box, the second branch limb and the second connecting beam is hoisted, disassembled and transported as a whole; the first main door-type unit composed of the first main roadbed box, the first main limb and the adjustable support assembly is hoisted, disassembled and transported as a whole; the first branch door-type unit composed of the first branch roadbed box, the first branch limb and the first connecting beam is hoisted, disassembled and transported as a whole; S4, second installation on site: staking out and marking the projection positions of the subsequent multiple large-span folded arch trusses on the ground, installing multiple groups of the first main door-type unit, the first branch door-type unit, the second main door-type unit, and the second branch door-type unit; inserting a shim between the first branch adjustment beam and the first branch roadbed box to adjust the first connecting beam; inserting a shim between the base and the first main roadbed box to adjust the adjustable support assembly; inserting a shim between the second branch adjustment beam and the second branch roadbed box to adjust the second connecting beam; inserting a shim between the second main adjustment beam and the second main roadbed box to adjust the support beam; installing the first fixing beam and the first cable between the first branch and the first main limb and applying prestress, and installing the second fixing beam and the second cable between the second branch and the second main limb and applying prestress; installing the horseway; S5, repeating the steps from S3 to S4 on site to circulate the large-span folded arch truss assembly device.

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