Exhibition hall roof adopting large-span folded-surface arched truss and construction method of exhibition hall roof

Abstract

The invention provides an exhibition hall roof adopting large-span folded-surface arch trusses and a construction method of the exhibition hall roof, a plurality of large-span folded-surface arch trusses are sequentially connected, and each group of supporting mechanisms are respectively arranged at two ends of each corresponding large-span folded-surface arch truss; the (n / 2 + 1) th truss and the (n / 2) th truss of adjacent large-span folded-surface arched trusses are connected through knuckle bearings, and the other two adjacent large-span folded-surface arched trusses are connected through connecting flanges; the large-span folded-surface arched truss comprises a main truss and two sets of wing trusses, and the two sets of wing trusses are hinged to the two opposite sides of the main truss respectively. The main truss is of an inverted triangular space truss structure; the wing truss is of a cantilever space structure. The exhibition hall roof is small in steel consumption in design, good in economic benefit, high in repeated utilization rate and high in industrial assembly degree.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building steel structure, in particular to an exhibition hall roof adopting large-span folded face arch truss and a construction method thereof. BACKGROUND

[0002] In recent years, large-span roof structures have developed rapidly and are widely used in large-scale landmark public buildings such as railway stations, stadiums, exhibition centers, airport terminals, etc. The structural forms include thin-shell structures, net rack structures, net shell structures, arch support structures, suspension structures, and various forms of membrane structures. Among them, the exhibition hall roof mainly adopts a spatial truss structure system.

[0003] The exhibition hall roof is usually composed of multiple identical trusses arranged along the longitudinal direction of the exhibition hall. In order to improve the lateral resistance of the roof structure, supporting structures are provided at both ends of the roof, and supports are provided between the supporting structures and the roof to release thermal stress. The number of supports is usually double the number of truss bays, which is large in quantity and high in cost. Due to the large number of supports, the strength and stiffness requirements of the supporting structure are high, resulting in large steel consumption and poor economy of the supporting structure.

[0004] In order to maintain the stability of the roof structure in the plane, secondary trusses or a large number of purlin welded connections are usually provided between adjacent trusses. This design not only increases the steel consumption and construction difficulty, but also increases the maintenance difficulty of the roof structure during the operation of the exhibition hall, and the replaceability and reusability of the truss are low. SUMMARY

[0005] One of the purposes of the present application is to provide an exhibition hall roof adopting large-span folded face arch truss and a construction method thereof, aiming to solve the problems of large steel consumption, poor economy, high maintenance difficulty, and low reusability of the existing exhibition hall roof design.

[0006] The technical solution of the present application is: An exhibition hall roof adopting large-span folded face arch truss, comprising large-span folded face arch trusses and supporting mechanisms; multiple trusses of the large-span folded face arch truss are connected in sequence; each group of the supporting mechanisms is arranged at both ends of each corresponding truss of the large-span folded face arch truss; Adjacent n / 2+1th and n / 2th trusses of the large-span folded face arch truss are connected through multiple groups of joint bearings, and when n is odd, n / 2 is rounded down; the remaining two adjacent trusses of the large-span folded face arch truss are connected through multiple groups of connecting flanges; The large-span folded face arch truss comprises a main truss and two groups of wing trusses, and the two groups of wing trusses are respectively hinged to opposite sides of the main truss; the main truss is a reverse triangular spatial truss structure, and the wing truss is a cantilever spatial structure.

[0007] As a technical scheme of the present application, the main truss comprises upper chords, lower chords, diagonal web member units and connecting rods; two upper chords are arranged in parallel and at intervals; the lower chords are arranged between the two upper chords; a plurality of connecting rods are respectively and at intervals connected between the two upper chords; each group of diagonal web member units is connected with the lower chords, adjacent two connecting rods and the respective connecting nodes of the upper chords.

[0008] As a technical scheme of the present application, the wing truss comprises a wing chord and a plurality of groups of connecting web member units; the plurality of groups of connecting web member units are respectively and at intervals connected to the wing chord, and one end thereof is hingedly connected to the connecting nodes of the lower chords and the diagonal web member units, and the other two ends are respectively hingedly connected to the connecting nodes of the adjacent two connecting rods and the upper chords.

[0009] As a technical scheme of the present application, the upper chords, the lower chords and the wing chord are all arc-shaped rods; the spatial position of the wing chord is higher than that of the lower chords, and is higher or lower than that of the upper chords; the arc of the upper chord is equal to that of the wing chord, and is smaller than that of the lower chords.

[0010] As a technical scheme of the present application, the main truss comprises a first main truss module, a second main truss module and a third main truss module which are sequentially connected through first positioning flanges; the wing truss comprises a first wing truss module, a second wing truss module and a third wing truss module which are sequentially connected through second positioning flanges.

[0011] As a technical scheme of the present application, the end of the upper chord, the end of the lower chord and the end of the diagonal web member unit at the two ends of the second main truss module are all provided with the first positioning flange, and the end of the upper chord, the end of the lower chord and the end of the diagonal web member unit at the inner ends of the first main truss module and the third main truss module are all provided with the first positioning flange; the end of the wing chord and the end of the connecting web member unit at the two ends of the second wing truss module are all provided with the second positioning flange, and the end of the wing chord and the end of the connecting web member unit at the inner ends of the first wing truss module and the third wing truss module are all provided with the second positioning flange.

[0012] As a technical scheme of the present application, the connecting flange is vertically connected between the adjacent two wing chords in two of the large-span folded surface arch trusses, and the connecting nodes of the connecting web member units and the wing chords meet at the same node; the joint bearing is vertically connected between the adjacent two wing chords in two of the large-span folded surface arch trusses, and the connecting nodes of the connecting web member units and the wing chords meet at the same node.

[0013] As a technical scheme of the present application, the connecting flange comprises two flange bodies and two short pipes arranged coaxially; one end of one of the flange bodies is connected to one end of the other flange body by bolts, and the other end is welded to one end of the corresponding short pipe; the other end of the short pipe is welded to the corresponding chorded strut.

[0014] As a technical scheme of the present application, the diagonal web member unit comprises four first diagonal web members, the connecting web member unit comprises a straight web member and two second diagonal web members arranged in a V shape; a butterfly-shaped insert plate and a single lug plate are arranged at the intersection node of the four first diagonal web members and the lower chorded strut, the butterfly-shaped insert plate is arranged along the central axis of the lower chorded strut and penetrates through the lower chorded strut, and the single lug plate is arranged vertically on both sides of the butterfly-shaped insert plate and is connected perpendicularly to the lower chorded strut; the first diagonal web members are connected perpendicularly to the butterfly-shaped insert plate, the single lug plate and the lower chorded strut; the straight web member intersects with the four first diagonal web members at the same connecting node, and the two second diagonal web members arranged in a V shape intersect with the connecting web member at the same connecting node.

[0015] As a technical scheme of the present application, the intersection node of the first diagonal web member and the lower chorded strut sequentially divides the lower chorded strut into a plurality of first segments, and the first projection length of the remaining first segments between the two first segments at both ends of the lower chorded strut is equal; the intersection node of the second diagonal web member and the chorded strut sequentially divides the chorded strut into a plurality of second segments, and the second projection length of the remaining second segments between the two second segments at both ends of the chorded strut is equal and equal to the first projection length; the intersection node of the first diagonal web member and the upper chorded strut divides the upper chorded strut into a plurality of third segments, a perpendicular line passing through the intersection node of the first diagonal web member and the lower chorded strut intersects the upper chorded strut and forms a foot point, and the foot point is the midpoint of the plurality of third segments on the upper chorded strut.

[0016] As a technical scheme of the present application, the supporting mechanism comprises a supporting column, a prestressed tension rod and a cast steel piece; the supporting column is in an inverted V shape, the top end of the supporting column is connected to the end of the lower chorded strut, and the supporting column intersects with the connecting node of the diagonal web member unit and the lower chorded strut; the two bottom ends of the supporting column are respectively connected to the cast steel pieces; one end of the prestressed tension rod is connected to the corresponding cast steel piece, and the other end of the prestressed tension rod is connected to the upper chorded strut and intersects with the connecting node of the diagonal web member unit and the upper chorded strut.

[0017] As a technical scheme of the present application, the supporting mechanism comprises a supporting column, a prestressed pull rod and a cast steel piece; the supporting column is in a V-shaped form, and two top ends thereof are connected with the lower chord respectively and intersect with the connecting nodes of the inclined web unit and the lower chord respectively; the bottom end of the supporting column is connected with the cast steel piece; one end of the prestressed pull rod is connected with the cast steel piece, and the other end thereof is connected with the upper chord and intersects with the connecting nodes of the inclined web unit and the upper chord.

[0018] As a technical scheme of the present application, the supporting column, the prestressed pull rod, the upper chord, the lower chord and the inclined web unit intersecting with the supporting column are all key components, the stress ratio of the key components is less than 0.85; the connecting rod and the remaining inclined web units separated from the supporting column are all important components, the stress ratio of the important components is less than 0.9; the wing chord and the connecting web unit are both general components, the stress ratio of the general components is less than 0.95.

[0019] A construction method of an exhibition hall roof cover using large-span folded face arch trusses, comprising the following steps: S1, component sub-division manufacturing is carried out in a factory near the installation site: the main truss in each large-span folded face arch truss is divided into a first main truss module, a second main truss module and a third main truss module connected by a first positioning flange, the second main truss module in the middle is flipped by 180° for horizontal manufacturing and transported to the site, and the first main truss module and the third main truss module at the end except the first positioning flange are flipped by 180° for horizontal manufacturing and transported to the site; the wing truss in each large-span folded face arch truss is divided into a first wing truss module, a second wing truss module and a third wing truss module connected by a second positioning flange, the second wing truss module in the middle is divided into two wing chords and multiple groups of connecting web units for manufacturing and transportation to the site, and the second positioning flange is connected with the corresponding wing chord and connecting web unit; the first wing truss module and the second wing truss module at the end are divided into two wing chords and multiple groups of connecting web units for manufacturing and transportation to the site; S2, on-site overall assembly: sequentially assemble the second main truss module, the first main truss module and the third main truss module on the jig frame, adjust the spatial position accuracy of the second main truss module with the first main truss module and the third main truss module respectively, assemble the first positioning flanges on the first main truss module and the third main truss module, connect the second main truss module with the first main truss module and the third main truss module through bolts respectively, and weld the first positioning flanges on the first main truss module and the third main truss module; sequentially assemble the second wing truss module, the first wing truss module and the third wing truss module, weld the second wing truss module, the first wing truss module and the third wing truss module respectively, assemble the second positioning flanges on the first wing truss module and the third wing truss module, connect the second wing truss module with the first wing truss module and the third wing truss module through bolts respectively, and weld the second positioning flanges on the first wing truss module and the third wing truss module; S3, on-site segmented hoisting: remove the bolts between adjacent first main truss modules, second main truss modules and third main truss modules, and remove the bolts between adjacent first wing truss modules, second wing truss modules and third wing truss modules, integrally hoist the assembly truss module composed of the second main truss module and the second wing truss module, and support and fix it using temporary supports; hoist the connecting truss module composed of the first main truss module and the first wing truss module and the connecting truss module composed of the third main truss module and the third wing truss module in batches, and support and fix them using temporary supports; connect the second main truss module with the first main truss module and the third main truss module through bolts respectively, and connect the second wing truss module with the first wing truss module and the third wing truss module through bolts respectively; S4, installation of exhibition hall roof: install the large-span folded arch truss according to the above steps, and whenever a large-span folded arch truss is installed, continue to install the connecting flanges or joint bearings between the two adjacent large-span folded arch trusses until all the large-span folded arch trusses are installed.

[0020] A construction method of an exhibition hall roof adopting a large-span folded arch truss, comprising the following steps: S1, in the factory near the installation site, the component sub-assembly is made: the main truss of each large-span folded arch truss is divided into a first main truss module, a second main truss module and a third main truss module connected by a first positioning flange, the second main truss module in the middle is flipped 180° for horizontal production and transported to the site, the first main truss module and the third main truss module at the end are flipped 180° for horizontal production and transported to the site; the wing truss of each large-span folded arch truss is divided into a first wing truss module, a second wing truss module and a third wing truss module connected by a second positioning flange, the second wing truss module in the middle is divided into two wing chords and multiple groups of connecting web units for separate production and transportation to the site, and the second positioning flange is connected with the corresponding wing chord and connecting web unit; the first wing truss module and the second wing truss module at the end are respectively divided into two wing chords and multiple groups of connecting web units for separate production and transportation to the site; S2, overall assembly on site: the second main truss module and the second wing truss module are assembled and welded on the jig, the first main truss module and the first wing truss module are assembled and welded on the jig, and the third main truss module and the third wing truss module are assembled and welded on the jig; the second main truss module, the second wing truss module, the first main truss module, the first wing truss module, the third main truss module and the third wing truss module are assembled using virtual pre-assembly technology; the first positioning flange on the first main truss module and the third main truss module is assembled and welded according to the virtual pre-assembly result, and the second positioning flange on the first wing truss module and the third wing truss module is assembled and welded; S3, on-site segmented hoisting: the assembled truss module composed of the second main truss module and the second wing truss module is hoisted as a whole and supported and fixed by temporary support; the connecting truss module composed of the first main truss module and the first wing truss module and the connecting truss module composed of the third main truss module and the third wing truss module are hoisted in batches and supported and fixed by temporary support; the second main truss module is bolted with the first main truss module and the third main truss module respectively, and the second wing truss module is bolted with the first wing truss module and the third wing truss module respectively; S4, installation of exhibition hall roof: the large-span folded arch truss is installed according to the above steps, and when one large-span folded arch truss is installed, the connecting flange or joint bearing between the adjacent two large-span folded arch trusses is continued to be installed until the installation is completed.

[0021] The beneficial effects of the present application are: (1) The exhibition hall roof cover designed by the present application adopts large-span folded arch truss, which realizes the sliding connection of the two through the setting of joint bearings between the n / 2+1th and n / 2th large-span folded arch trusses (i.e. the middle region of the exhibition hall roof cover), thereby relaxing the axial force mechanism, so as to effectively reduce the influence of temperature stress on the overall structure, and solve the problems of large amount of support, high cost, large amount of steel used for support mechanism, and poor economy caused by the large amount of support set between the truss and the support mechanism to reduce the temperature stress in the prior art; the present application solves the problems of large amount of steel used, increased construction difficulty, and low replaceability and reusability of the truss caused by the setting of secondary trusses or a large number of purlin welded connections between adjacent trusses by setting multiple groups of connecting flanges between the remaining two adjacent large-span folded arch trusses.

[0022] (2) Further, the present application designs an exhibition hall roof cover adopting large-span folded arch truss, wherein the large-span folded arch truss can meet the design requirements of the exhibition hall roof in two dimensions of longitudinal and transverse directions by designing the radii and spatial heights of the top chord, bottom chord and wing chord, has wide application range, and can effectively solve the problem of single design of existing space truss.

[0023] (3) Further, the present application also designs a parameterized large-span folded arch truss, which obtains a clear, explicit and readable spatial steel structure system by parameterizing the connection nodes of the main truss and wing truss, solves the problem of complex and chaotic overall structure of existing space truss, and enables the parameterized large-span folded arch truss to be produced and assembled in a modular and batch manner, greatly improving the construction efficiency, saving time and effort, saving cost, and shortening the construction period.

[0024] (4) Further, according to the force transmission path of the large-span folded arch truss and the stress characteristics of each component, the present application classifies each component according to importance, designs a stress ratio control value according to the importance degree, thereby reducing the design redundancy of the component; by designing the upper chord radius R1 to be smaller than the lower chord radius R2, the length of the first inclined web member at both ends of the large-span folded arch truss is reduced, the steel consumption of the first inclined web member is greatly reduced, the construction efficiency is improved, and the problems of large steel consumption and poor economic efficiency of existing space truss are solved.

[0025] (5) Further, it designs a parallel array type modular exhibition hall roof, by designing the main truss and the wing truss as hinged connection, and designing the main truss and the wing truss as a plurality of modular first positioning flanges and second positioning flanges respectively, greatly improving the modular assembly of the exhibition hall roof, effectively improving the assembly efficiency.

[0026] (6) The application designs a construction method of an exhibition hall roof adopting a large-span folded face arch truss, which is produced and assembled in an industrialized manner, the component is partially produced in a factory near the installation site, so that the large-span folded face arch truss produced in three sections can realize the transportation of large-size components; at the same time, by designing the main truss and the wing truss as hinged connection, and designing the main truss and the wing truss as a plurality of modular first positioning flanges and second positioning flanges respectively, and dividing the main truss into three sections for production and dividing the wing truss into three sections for production, the modular assembly of the exhibition hall roof is greatly improved, the assembly efficiency is effectively improved, the site installation efficiency is greatly improved, and the problem of low industrialization and assembly degree of the existing construction method is solved.

[0027] (7) The application designs a construction method of an exhibition hall roof adopting a large-span folded face arch truss, which is produced and assembled in an industrialized manner, according to the spatial line type and size of the large-span folded face arch truss, virtual pre-assembly positioning is adopted to assemble the first positioning flange and the second positioning flange, which solves the problems of large site occupation, large jig requirement and high construction machinery requirement when the large-span folded face arch truss with large camber and sagitta is pre-assembled as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 The schematic view of the exhibition hall roof structure provided by the first embodiment of the application; Figure 2 The schematic view of the joint bearing in Figure 1 Figure 3 The exploded view of the large-span folded face arch truss provided by the first embodiment of the application; Figure 4 The plan view of the large-span folded face arch truss provided by the first embodiment of the application; Figure 5 The elevation view of the large-span folded face arch truss provided by the first embodiment of the application;​ Figure 6 The connection flange structure schematic diagram provided for the first embodiment of the application; Figure 7 The lower chord and the first inclined web member node schematic diagram provided for the first embodiment of the application; Figure 8 The cast steel part schematic diagram provided for the first embodiment of the application; Figure 9 The long-span folded face arch truss connection node parameterized design schematic diagram provided for the first embodiment of the application; Figure 10 The main truss exploded view provided for the first embodiment of the application; Figure 11 The Figure 10 The first positioning flange connection local enlarged schematic diagram; Figure 12 The wing truss exploded view provided for the first embodiment of the application; Figure 13 The Figure 12 The second positioning flange connection local enlarged schematic diagram; Figure 14 The long-span folded face arch truss stress mechanism schematic diagram under normal working condition (vertical load) provided for the first embodiment of the application; Figure 15 The long-span folded face arch truss stress mechanism schematic diagram under abnormal working condition (lateral wind load) provided for the first embodiment of the application; Figure 16 The main truss module factory manufacturing schematic diagram provided for the first embodiment of the application; Figure 17 The wing truss module factory manufacturing schematic diagram provided for the first embodiment of the application; Figure 18 The long-span folded face arch truss on-site assembly first process schematic diagram provided for the first embodiment of the application; Figure 19 The long-span folded face arch truss on-site assembly second process schematic diagram provided for the first embodiment of the application; Figure 20 The long-span folded face arch truss on-site assembly third process schematic diagram provided for the first embodiment of the application; Figure 21 The long-span folded face arch truss on-site assembly fourth process schematic diagram provided for the first embodiment of the application; Figure 22 The long-span folded face arch truss on-site installation first process schematic diagram provided for the first embodiment of the application; Figure 23 The long-span folded face arch truss on-site installation second process schematic diagram provided for the first embodiment of the application; Figure 24 A schematic view of the exhibition hall roof structure provided by the third embodiment of the present application; Figure 25 A schematic view of the large-span folded arch truss provided by the third embodiment of the present application; Figure 26 A first angle elevation view of the large-span folded arch truss provided by the third embodiment of the present application; Figure 27 A second angle elevation view of the large-span folded arch truss provided by the third embodiment of the present application.

[0030] Icon: 1 - exhibition hall roof; 2 - large-span folded arch truss; 3 - supporting mechanism; 4 - main truss; 41 - upper chord; 42 - lower chord; 43 - first inclined web member; 44 - connecting rod; 45 - butterfly plug; 46 - single lug plate; 47 - first main truss module; 48 - second main truss module; 49 - third main truss module; 5 - wing truss; 51 - wing chord; 52 - straight web member; 53 - second inclined web member; 54 - first wing truss module; 55 - second wing truss module; 56 - third wing truss module; 6 - supporting column; 7 - prestressed tension rod; 8 - cast steel piece; 81 - annular groove; 9 - connecting flange; 91 - flange body; 92 - short pipe; 10 - knuckle bearing; 11 - first positioning flange; 12 - second positioning flange. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. 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.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0033] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the application, it should be noted that the terms "upper", "lower" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0035] In addition, in this application, unless otherwise explicitly specified and limited, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0037] In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0038] First embodiment: Please refer to Figure 1 , combined with reference to Figures 2 to 23 , the application provides a kind of exhibition hall roof with large-span folded face arch truss, its main body is as shown in Figures 1-2 : a kind of exhibition hall roof with large-span folded face arch truss 1, size is 189 ×104 meters, it mainly includes large-span folded face arch truss 2, supporting mechanism 3, connecting flange 9, joint bearing 10;Among them, 11 large-span folded face arch truss 2 is sequentially connected arrangement, the 6th and the 5th large-span folded face arch truss 2 are connected by 17 groups of joint bearings 10, the remaining two adjacent large-span folded face arch truss 2 are connected by 17 groups of connecting flanges 9, supporting mechanism 3 is arranged at both ends of large-span folded face arch truss 2.

[0039] As Figures 3-13 shown, the large-span folded arch truss 2 is composed of a main truss 4 and a wing truss 5, the main truss 4 has a width of 3 meters, and the wing truss 5 has a width of 7 meters, the wing truss 5 is arranged on both sides of the main truss 4 and connected to the main truss 4 through hinged connection. The main truss 4 is a reverse triangular space truss structure, which is mainly composed of upper chord bars 41, lower chord bars 42, diagonal web member units, connecting bars 44 and a plurality of first positioning flanges 11, two upper chord bars 41 are arranged in parallel and at intervals, the lower chord bars 42 are arranged between the two upper chord bars 41, a plurality of connecting bars 44 are respectively and intervally connected between the two upper chord bars 41, and each group of diagonal web member units is connected to each connecting node of the lower chord bars 42, adjacent two connecting bars 44 and the upper chord bars 41, wherein the diagonal web member unit is composed of four first diagonal web members 43, the same end of the four first diagonal web members 43 converges on the lower chord bars 42, and the other end is respectively connected to the two upper chord bars 41 and intersects with each connecting node of the adjacent two connecting bars 44 and the upper chord bars 41. The wing truss 5 is a cantilever space structure, which is mainly composed of a wing chord bar 51, straight web members 52, connecting web member units and a plurality of second positioning flanges 12, a plurality of connecting web member units are intervally connected to the wing chord bar 51 along the length direction of the wing chord bar 51, and one end of the connecting web member unit is hingedly connected to the connecting node of the lower chord bars 42 and the diagonal web member unit, and the other two ends are respectively hingedly connected to the connecting nodes of the adjacent two connecting bars 44 and the upper chord bars 41; further, the connecting web member unit is composed of two second diagonal web members 53 which jointly form a V-shaped structure, the wing chord bar 51 is an external envelope of the straight web members 52 and the second diagonal web members 53, the two V-shaped second diagonal web members 53 and the first diagonal web members 43 arranged between the two V-shaped second diagonal web members 53 and directly below the two V-shaped second diagonal web members 53 jointly converge at a point as a group of web member units, and 15 groups of web member units are intervally arranged along the axis of the wing chord bar 51.

[0040] As Figure 6 shown, the connecting flange 9 is composed of two flange bodies 91 and two short pipes 92 arranged coaxially; one end of one flange body 91 is connected to one end of the other flange body 91 through a bolt, and the other end is welded to one end of the corresponding short pipe 92; the other end of the short pipe 92 is welded to the wing chord bar 51. Specifically, the flange body 91 is composed of a top circular plate, a bottom circular plate and a rib plate between the two. The overall length of the connecting flange 9 is 1 meter.

[0041] It should be noted that in the embodiment, the structure of the first positioning flange 11 and the second positioning flange 12 can be designed to be the same structure as the flange body 91.

[0042] The longitudinal length of the exhibition hall roof 1 is 189 meters, which is an overlength structure, and the lateral stiffness of the structure (support column 6) is large, and the temperature load usually generates large secondary stress. Because the stiffness of the support column 6 is large and is uniformly distributed in the length range, the temperature stress has a great influence on the structure, especially on the internal force of the side span truss structure and the support reaction force. In order to avoid this situation, the sliding connection between the sixth and fifth large-span folded arch trusses 2 is realized by setting the joint bearing 10 therebetween, so as to relax the axial force mechanism, so as to effectively reduce the influence of the temperature stress on the overall structure, and solve the problems of large amount of support, high cost and large amount of steel of the support mechanism 3 caused by the large amount of support between the truss and the support mechanism 3 in the prior art. At the same time, the adjacent two large-span folded arch trusses 2 are connected by a plurality of connecting flanges 9, which solves the problems of large amount of steel, increased construction difficulty, large maintenance difficulty of the exhibition hall during operation, low replaceability and reusability of the truss caused by the secondary truss or a large number of purlin welded connections between the adjacent trusses in the prior art.

[0043] As shown in Figure 1 , the connecting flange 9 is vertically connected between the adjacent wing chord bars 51 and meets the second diagonal web member 53 and the straight web member 52 at the same node; the joint bearing 10 is vertically connected between the adjacent wing chord bars 51 and meets the second diagonal web member 53 and the straight web member 52 at the same node. As shown in Figure 4 , the straight web member 52 meets the first diagonal web member 43 at a node, and the second diagonal web member 53 meets the connecting rod 44 at a node.

[0044] As shown in Figure 3 , the support mechanism 3 includes a support column 6, a prestressed tension rod 7 and a cast steel piece, wherein the support column 6 is in the shape of an inverted V, the top end of the inverted V-shaped support column 6 meets the lower chord 42 at a node, and the bottom end of the inverted V-shaped support column 6 is connected with two cast steel pieces 8 respectively; at the same time, one end of the prestressed tension rod 7 is connected with the cast steel piece 8, and the other end is connected with the upper chord 41.

[0045] As shown in Figure 8 , the bottom of the cast steel piece 8 is provided with a ring-shaped groove 81 with a depth of 40mm and a width of 40mm. By setting the ring-shaped groove 81 at the bottom of the cast steel piece 8, the line of sight of people can be attracted, and people's attention to the joint interface of the cast steel piece 8 and the concrete can be avoided, so as to increase the effect of the whole support mechanism 3 and create artistic feeling.

[0046] As shown in Figure 9As shown, the upper chord 41, the lower chord 42 and the wing chord 51 are all arc-shaped members and are arranged in parallel, and the spatial position of the wing chord 51 is higher than that of the lower chord 42 and lower than that of the upper chord 41. The arc R1 of the upper chord 41 is equal to the arc R1 of the wing chord 51, and the arc R1 of the upper chord 41 is smaller than the arc R2 of the lower chord 42.

[0047] By designing the arcs of the upper chord 41, the lower chord 42 and the wing chord 51, the exhibition hall roof can form a curved surface modeling in the transverse direction; by designing the spatial height of the wing chord 51, the exhibition hall roof can form a downward folded surface modeling in the longitudinal direction, thereby meeting the modeling requirements of the exhibition hall roof in the longitudinal and transverse directions, having a wide range of applications and being able to solve the problem of single modeling of the existing space truss. By designing the arc R1 of the upper chord 41 to be smaller than the arc R2 of the lower chord 42, the sag of the truss gradually decreases from the middle to the two ends, thereby gradually reducing the length of the first inclined web member 43 and further reducing the steel consumption of the first inclined web member 43 in the overall structure, and solving the problem of large steel consumption and poor economic effectiveness of the existing space truss.

[0048] As shown in the drawings, Figure 7 The intersection node of the first inclined web member 43 and the lower chord 42 is provided with a butterfly plug plate 45 and a single lug plate 46. The butterfly plug plate 45 is butterfly-shaped and is arranged along the central axis of the lower chord 42 and penetrates the lower chord 42. The single lug plate 46 is vertically arranged on both sides of the butterfly plug plate 45 and is vertically matched with the lower chord 42. The first inclined web member 43 is connected with the butterfly plug plate 45, the single lug plate 46 and the lower chord 42, respectively.

[0049] By arranging the butterfly plug plate 45 and the single lug plate 46, the four first inclined web members 43 are avoided from being welded, thereby avoiding stress concentration and reducing the welding difficulty on site and improving the construction efficiency. The butterfly plug plate 45 is butterfly-shaped and has a unique modeling, which gives the structure a sense of beauty.

[0050] As shown in the drawings, Figure 9 The intersection node of the first inclined web member 43 and the lower chord 42 divides the lower chord 42 into a plurality of first segments. Except for the first segments at the two ends of the lower chord 42, the first projection lengths of the remaining first segments are equal. The intersection node of the second inclined web member 53 and the wing chord 51 divides the wing chord 51 into a plurality of second segments. Except for the second segments at the two ends of the wing chord 51, the second projection lengths of the remaining second segments are equal to the first projection lengths. The intersection node of the first inclined web member 43 and the upper chord 41 divides the upper chord 41 into a plurality of third segments. A perpendicular line passing through the intersection node of the first inclined web member 43 and the lower chord 42 intersects the upper chord 41 to form a foot point, which is the midpoint of the plurality of third segments on the upper chord 41.

[0051] By parameterizing the connection nodes of the truss, a clear, explicit and readable spatial steel structure system can be obtained, solving the problem of the complex and chaotic whole structure of the existing spatial truss, enabling the parameterized large-span folded arch truss 2 to be produced and assembled in a modular and batch manner, greatly improving the construction efficiency, saving time and labor, saving cost and shortening the construction period.

[0052] It should be noted that the main truss 4 is connected by the first positioning flange 11 in sequence from the first main truss module 47 at the end, the second main truss module 48 at the middle, and the third main truss module 49 at the end in the span direction. The wing truss 5 is connected by the second positioning flange 12 in sequence from the first wing truss module 54 at the end, the second wing truss module 55 at the middle, and the third wing truss module 56 at the end in the span direction.

[0053] As shown in Figures 10-13 the end of the upper chord 41, the end of the lower chord 42, and the end of the first diagonal web member 43 at both ends of the second main truss module 48 are provided with the first positioning flange 11, and the end of the upper chord 41, the end of the lower chord 42, and the end of the first diagonal web member 43 at the inner end of the first main truss module 47 and the third main truss module 49 are provided with the first positioning flange 11. The end of the wing chord 51 and the end of the second diagonal web member 53 at both ends of the second wing truss module 55 are provided with the second positioning flange 12, and the end of the wing chord 51 and the end of the second diagonal web member 53 at the inner end of the first wing truss module 54 and the third wing truss module 56 are provided with the second positioning flange 12.

[0054] By dividing the main truss 4 and the wing truss 5 into three modules along the longitudinal direction, the modules are connected by the first positioning flange 11 and the second positioning flange 12, which not only realizes the assembly design of the truss structure, but also realizes the field assembly installation, greatly reducing the number of field hoisting and welding work, and improving the installation efficiency. Further, the main truss 4 and the wing truss 5 are connected in a hinged manner, further improving the assembly rate of the truss, which not only greatly reduces the welding amount of the main truss 4 and the wing truss 5 on site, but also realizes the field assembly installation, improving the field assembly efficiency. Furthermore, the connection flange 9 is used to connect each truss, which is also an effective design measure to reduce the amount of field welding and improve the installation efficiency. A parallel array type modular exhibition hall roof 1 is formed by a large number of bolt connections, greatly improving the assembly rate of the exhibition hall roof 1 design, which not only facilitates construction, but also greatly improves the maintenance work efficiency of the truss during the operation stage of the exhibition hall, and does not damage the overall structure of the roof.

[0055] The support column 6, the prestressed tension rod 7, the upper chord 41, the lower chord 42, and the inclined web member unit intersecting with the support column 6 are all key members, and the stress ratio control of the key members is 0.85 or less. The connecting rod 44 and the rest of the inclined web member units not intersecting with the support column 6 are all important members, and the stress ratio control of the important members is 0.9 or less. The wing chord 51, the second inclined web member 53, and the straight web member 52 are general members, and the stress ratio control of the general members is 0.95 or less.

[0056] Therefore, according to the force transmission path of the space truss and the stress characteristics of each member, the members are classified according to the importance, and the stress ratio control value is designed according to the importance, thereby reducing the design redundancy of the members and further reducing the steel consumption of the exhibition hall roof 1.

[0057] The present embodiment mainly considers two working conditions from the construction state to the use state, one is the normal working condition, such as Figures 10-11 as shown, the main loads are the structure dead load + additional dead load + additional live load; the second is the abnormal working condition, such as Figures 12-13 as shown, the strong wind condition is considered, and the main loads are the structure dead load + additional dead load + lateral wind load. The specific description is as follows: In the normal working condition, as shown in Figure 14 the vertical load is first transmitted to the upper chord 41 of the main truss 4 and the wing truss 5 and the main truss 4. The wing truss 5 spans the space between the main trusses 4, transmits the load to the main trusses 4 on both sides, and simultaneously plays a role in connecting and coordinating the main trusses 4. The entire truss forms a single-span portal steel frame with a span of 99.5m, and the prestressed tension rod 7 provides a back anchoring effect and can effectively reduce the vertical deformation of the structure under the action of gravity load. For uniform gravity load, each main truss 4 can be independently stressed on the structure, and the wing truss 5 between the main trusses 4 mainly provides the integrity between the units and provides additional help for controlling the torsion of each unit under unbalanced load.

[0058] In the abnormal working condition, as shown in Figure 15 in the transverse direction of the structure, the structure is similar to a two-hinged portal to provide its lateral stiffness. The lateral stiffness redundancy is good, and the prestress degree of the steel prestressed tension rod 7 is set so that it will not relax under all load combinations. In the extreme case, even if a prestressed tension rod 7 fails, the structure forms a three-hinged portal, which is also a system with good horizontal stiffness. The lateral force resisting system of the structure in the longitudinal direction is provided by the support column 6, so that the longitudinal structural stiffness and redundancy of the overall structure are very high, and thus the failure of any column will not affect the load-carrying capacity and lateral force resisting capacity of the structure system.

[0059] Second embodiment: The embodiment provides a construction method of an exhibition hall roof cover adopting a large-span folded face arch truss, which mainly comprises the following steps. S1, component sub-assembly is carried out in a factory near the installation site: the second main truss module 48 is flipped by 180° and horizontally made and transported to the site, the first main truss module 47 and the third main truss module 49 at the end except the first positioning flange 11 are flipped by 180° and horizontally made and transported to the site as a whole; the second wing truss module 55 is divided into two wing chords 51, a plurality of second inclined web members 53 and a plurality of straight web members 52, and transported to the site, wherein the second positioning flange 12 is connected with the wing chord 51, the second inclined web member 53 and the straight web member 52; the first wing truss module 54 and the third wing truss module 56 are divided into two wing chords 51, a plurality of second inclined web members 53 and a plurality of straight web members 52, and transported to the site, wherein the second positioning flange 12 is not connected with the wing chord 51, the second inclined web member 53 and the straight web member 52; S2, on-site assembly: the second main truss module 48 is assembled on the jig, then the first main truss module 47 and the third main truss module 49 at the two ends thereof are assembled, the spatial position precision of the second main truss module 48 and the first main truss module 47 and the third main truss module 49 is adjusted, then the first positioning flange 11 on the first main truss module 47 and the third main truss module 49 is welded, the second main truss module 48 is connected with the first main truss module 47 and the third main truss module 49 through bolts, and the first positioning flange 11 on the first main truss module 47 and the third main truss module 49 is welded; the second wing truss module 55 is continuously assembled, then the first wing truss module 54 and the third wing truss module 56 are assembled, the second wing truss module 55, the first wing truss module 54 and the third wing truss module 56 are welded, finally the second positioning flange 12 on the first wing truss module 54 and the third wing truss module 56 is assembled, the second wing truss module 55 is connected with the first wing truss module 54 and the third wing truss module 56 through bolts, and the second positioning flange 12 on the first wing truss module 54 and the third wing truss module 56 is welded; S3, on-site segment hoisting: remove the bolts between the adjacent first main truss module 47, second main truss module 48 and third main truss module 49, and remove the bolts between the adjacent first wing truss module 54, second wing truss module 55 and third wing truss module 56; the truss module composed of the second main truss module 48 and the second wing truss module 55 is hoisted as a whole, and is supported and fixed by using temporary supports, the truss module composed of the first main truss module 47 and the first wing truss module 54 and the truss module composed of the third main truss module 49 and the third wing truss module 56 are hoisted in batches, and are supported and fixed by using temporary supports; the second main truss module 48 is bolted with the first main truss module 47 and the third main truss module 49 respectively, and the second wing truss module 55 is bolted with the first wing truss module 54 and the third wing truss module 56 respectively; S4, installation of exhibition hall roof 1: install the large-span folded arch truss 2 according to the above steps, and install the connecting flange 9 or joint bearing 10 after the installation of each truss is completed, until the installation is completed.

[0060] Therefore, in the embodiment, a construction method of an exhibition hall roof using large-span folded arch trusses is designed, which is industrialized and assembled, the components are partially manufactured in a factory near the installation site, so that the large-span folded arch truss 2 manufactured in three sections can realize the transportation of large-size components; meanwhile, the main truss 4 and the wing truss 5 are designed to be hingedly connected, the main truss 4 and the wing truss 5 are respectively designed to be connected by a plurality of modular first positioning flanges 11 and second positioning flanges 12, the main truss 4 is divided into three sections for manufacturing, and the wing truss 5 is divided into three sections for manufacturing, thereby greatly improving the modular assembly of the exhibition hall roof 1, effectively improving the assembly efficiency, greatly improving the on-site installation efficiency, and solving the problem of low industrialization and assembly degree of the existing construction method.

[0061] Third embodiment: Please refer to Figure 24 , please refer to Figures 25 to 27 The application provides an exhibition hall roof using large-span folded arch trusses, which is substantially the same as the structure and connection method in the first embodiment, and only the differences between the two will be described in detail below, and the same parts will not be repeated here: The scheme of the embodiment is aimed at Figure 24As shown in the figure: the exhibition hall roof 1 adopts large-span folded arch truss, the size of which is 170*140 meters, and it mainly includes large-span folded arch truss 2, supporting mechanism 3, connecting flange 9, joint bearing 10, 6 large-span folded arch trusses 2 are connected and arranged in sequence, the third and the fourth large-span folded arch trusses 2 are connected through 18 joint bearings 10, and the rest of the adjacent large-span folded arch trusses 2 are connected through 18 connecting flanges 9, and the supporting mechanism 3 is arranged at both ends of the large-span folded arch truss 2.

[0062] As shown in the figure: Figures 25-27 The upper chord 41, the lower chord 42 and the wing chord 51 are all arc-shaped members and are arranged in parallel, and the spatial position of the wing chord 51 is higher than that of the lower chord 42 and the upper chord 41. The supporting mechanism 3 includes supporting column 6, prestressed rod 7 and cast steel 8; wherein the supporting column 6 is V-shaped, the top end of the V-shaped supporting column 6 intersects with the lower chord 42 at two nodes respectively, and the bottom end of the V-shaped supporting column 6 is connected with the cast steel 8; one end of the prestressed rod 7 is connected with the cast steel 8, and the other end is connected with the upper chord 41.

[0063] It should be noted that the cast steel 8 is provided with a circumferential groove 81 at the bottom, the depth of which is 40mm and the width of which is 50mm.

[0064] By designing the curvature of the upper chord 41, the lower chord 42 and the wing chord 51, the upper chord 41, the lower chord 42 and the wing chord 51 as a whole form a "reverse arch" shape, so that the exhibition hall roof forms a gradually upward curved surface in the longitudinal direction, and the upward part can be used as a rainproof roof of the exhibition center corridor structure. By designing the spatial height of the wing chord 51, the exhibition hall roof forms an upward folded surface in the transverse direction, which meets the different modeling needs of architects, has a wide range of applications, and can effectively solve the problem of single existing space truss structure.

[0065] Fourth embodiment: In this embodiment, a construction method of an exhibition hall roof adopting large-span folded arch truss is provided, which mainly includes four steps of component factory sub-assembly, on-site overall assembly, on-site segmented hoisting and exhibition hall roof 1 installation. The installation method is basically the same as that in the second embodiment, and only the differences between the two will be described in detail below, and the same parts will not be repeated here: In step S2, when the whole assembly is carried out on site, the second main truss module 48 is assembled and welded with the second wing truss module 55 on the jig frame, the first main truss module 47 is assembled and welded with the first wing truss module 54 on the jig frame, and the third main truss module 49 is assembled and welded with the third wing truss module 56 on the jig frame; the second main truss module 48, the second wing truss module 55, the first main truss module 47, the first wing truss module 54, the third main truss module 49 and the third wing truss module 56 are assembled by using the virtual pre-assembly technology; the first positioning flange 11 on the first main truss module 47 and the third main truss module 49 is assembled and welded according to the virtual pre-assembly result, and the second positioning flange 12 on the first wing truss module 54 and the third wing truss module 56 is assembled and welded.

[0066] In step S3, when the segmented hoisting is carried out on site, the assembled truss module composed of the second main truss module 48 and the second wing truss module 55 is hoisted as a whole and is fixed by using temporary support; the connecting truss module composed of the first main truss module 47 and the first wing truss module 54 and the connecting truss module composed of the third main truss module 49 and the third wing truss module 56 are hoisted in batches and are fixed by using temporary support; the second main truss module 48 is bolted with the first main truss module 47 and the third main truss module 49 respectively, and the second wing truss module 55 is bolted with the first wing truss module 54 and the third wing truss module 56 respectively.

[0067] Therefore, in the embodiment, the construction method of the exhibition hall roof with the large-span folded arch truss for industrialized production and assembly installation is designed, the first positioning flange 11 and the second positioning flange 12 are assembled by using virtual pre-assembly positioning according to the spatial line type and size of the large-span folded arch truss 2, and the problems of large site occupation, large amount of jig frame and high construction machinery requirement in the whole pre-assembly of the large-span folded arch truss 2 with large camber and sagitta are solved.

[0068] The above only describes the preferred embodiments of the present application and is not used to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An exhibition hall roof using a large-span folded arch truss, characterized in that: It comprises a large-span folding arch truss and a supporting mechanism; a plurality of the large-span folding arch trusses are connected in sequence; each group of the supporting mechanisms is respectively arranged at both ends of each corresponding large-span folding arch truss; The adjacent (n / 2+1)th and (n / 2)th large-span folded arch trusses are connected by multiple sets of joint bearings. When n is an odd number, n / 2 is rounded up to the nearest integer. The remaining two adjacent large-span folded arch trusses are connected by multiple sets of connecting flanges. The large-span folded arch truss includes a main truss and two groups of wing trusses, and the two groups of wing trusses are respectively hinged to the opposite sides of the main truss; the main truss is an inverted triangle space truss structure, and the wing trusses are cantilevered space structures.

2. The exhibition hall roof using large-span folded arch trusses according to claim 1 is characterized in that: The main truss includes an upper chord, a lower chord, a diagonal web unit and a connecting rod; the two upper chords are arranged in parallel and spaced apart; the lower chord is located between the two upper chords; multiple connecting rods are respectively connected between the two upper chords at intervals; each group of the diagonal web units is respectively connected to each connection node of the lower chord, two adjacent connecting rods and the upper chord.

3. The exhibition hall roof using large-span folded arch trusses according to claim 2 is characterized in that: The wing truss includes a wing chord and multiple groups of connecting web units; the multiple groups of connecting web units are respectively connected to the wing chord, and one end of each group is hinged to the connection node between the lower chord and the diagonal web unit, and the other two ends are respectively hinged to the connection nodes between two adjacent connecting rods and the upper chord.

4. The exhibition hall roof using large-span folded arch trusses according to claim 3 is characterized in that: The upper chord, the lower chord and the wing chord are all arc-shaped rods; the spatial position of the wing chord is higher than the lower chord, and higher or lower than the upper chord; the curvature of the upper chord is equal to that of the wing chord and smaller than that of the lower chord.

5. The exhibition hall roof using large-span folded arch trusses according to claim 1 is characterized in that: The main truss includes a first main truss module, a second main truss module, and a third main truss module, which are sequentially connected through a first positioning flange; the wing truss includes a first wing truss module, a second wing truss module, and a third wing truss module, which are sequentially connected through a second positioning flange.

6. The exhibition hall roof using large-span folded arch trusses according to claim 3 is characterized in that: The connecting flange is vertically connected between two adjacent chord rods in the two large-span folded-surface arch trusses, and intersects with the connection node between the connecting web rod unit and the chord rod at the same node; the joint bearing is vertically connected between two adjacent chord rods in the two large-span folded-surface arch trusses, and intersects with the connection node between the connecting web rod unit and the chord rod at the same node.

7. The exhibition hall roof using large-span folded arch trusses according to claim 3 is characterized in that: The diagonal web member unit includes four first diagonal web members, and the connecting web member unit includes a straight web member and two second diagonal web members arranged in a V shape; a butterfly-shaped plug plate and a single ear plate are provided at the intersection nodes of the four first diagonal web members and the lower chord, the butterfly-shaped plug plate is arranged along the central axis of the lower chord and passes through the lower chord, and the single ear plate is perpendicularly arranged on both sides of the butterfly-shaped plug plate and perpendicularly connected to the lower chord; the first diagonal web member is respectively connected to the butterfly-shaped plug plate, the single ear plate, and the lower chord; the straight web member and the four first diagonal web members intersect at the same connection node, and the two second diagonal web members arranged in a V shape intersect with the connecting rod at the same connection node.

8. The exhibition hall roof using large-span folded arch trusses according to claim 7 is characterized in that: The intersection node of the first diagonal web member and the lower chord member divides the lower chord member into a plurality of first segments in sequence, and the first projection lengths of the remaining first segments between the two first segments at both ends of the lower chord member are all equal; the intersection node of the second diagonal web member and the chord member divides the chord member into a plurality of second segments in sequence, and the second projection lengths of the remaining second segments between the two second segments at both ends of the chord member are all equal and equal to the first projection length; the intersection node of the first diagonal web member and the upper chord member divides the upper chord member into a plurality of third segments, and a perpendicular line is drawn through the intersection node of the first diagonal web member and the lower chord member, intersecting at the upper chord member and forming a perpendicular foot point, which is the midpoint of the plurality of third segments on the upper chord member.

9. The exhibition hall roof using large-span folded arch trusses according to claim 3 is characterized in that: The supporting mechanism includes a supporting column, a prestressed tie rod and a steel casting; the supporting column is in an inverted V shape, and the top end is connected to the end of the lower chord, and intersects with the connection node between the diagonal web member unit and the lower chord; the two bottom ends of the supporting column are respectively connected to the steel casting; one end of the prestressed tie rod is connected to the corresponding steel casting, and the other end is connected to the upper chord, and intersects with the connection node between the diagonal web member unit and the upper chord.

10. The exhibition hall roof using large-span folded arch trusses according to claim 3 is characterized in that: The supporting mechanism includes a supporting column, a prestressed tie rod and a steel casting; the supporting column is V-shaped, and the two top ends are respectively connected to the lower chord, and respectively intersect with the connection nodes of the diagonal web member unit and the lower chord; the bottom end of the supporting column is connected to the steel casting; one end of the prestressed tie rod is connected to the steel casting, and the other end is connected to the upper chord, and intersects with the connection node of the diagonal web member unit and the upper chord.

11. The exhibition hall roof using large-span folded arch trusses according to claim 9 or 10, characterized in that: The supporting column, the prestressed tension rod, the upper chord, the lower chord, and the diagonal web unit intersecting the supporting column are all key components, and the stress ratio of the key components is less than 0.85; the connecting rod and the remaining diagonal web units separated from the supporting column are all important components, and the stress ratio of the important components is less than 0.9; the chord rod and the connecting web unit are all general components, and the stress ratio of the general components is less than 0.

95.

12. A construction method for an exhibition hall roof using a large-span folded arch truss, characterized in that: The following steps are involved: S1, carry out component production in a factory near the installation site: divide the main truss of each large-span folded arch truss into a first main truss module, a second main truss module, and a third main truss module connected by a first positioning flange in sequence, turn the second main truss module in the middle by 180 degrees as a whole, carry out horizontal production and transport to the site, turn the first main truss module and the third main truss module at the end excluding the first positioning flange by 180 degrees as a whole, carry out horizontal production and transport to the site as a whole; The wing truss in the arch truss is sequentially divided into a first wing truss module, a second wing truss module, and a third wing truss module connected by a second positioning flange. The second wing truss module in the middle is divided into two chord rods and multiple groups of connecting web rod units, which are separately manufactured and transported to the site. The second positioning flanges are respectively connected to the corresponding chord rods and the connecting web rod units. The first wing truss module and the second wing truss module at the end are respectively divided into two chord rods and multiple groups of connecting web rod units, which are separately manufactured and transported to the site. S2, on-site overall assembly: assemble the second main truss module, the first main truss module, and the third main truss module on the tire frame in sequence, adjust the spatial position accuracy of the second main truss module with the first main truss module and the third main truss module respectively, assemble the first positioning flanges on the first main truss module and the third main truss module, connect the second main truss module with the first main truss module and the third main truss module respectively by bolts, and weld the first positioning flanges on the first main truss module and the third main truss module; assemble the second wing truss module, the first wing truss module, and the third wing truss module in sequence, weld the second wing truss module, the first wing truss module, and the third wing truss module respectively, assemble the second positioning flanges on the first wing truss module and the third wing truss module, connect the second wing truss module with the first wing truss module and the third wing truss module respectively by bolts, and weld the second positioning flanges on the first wing truss module and the third wing truss module; S3, on-site segmented hoisting: remove the bolts between the adjacent first main truss modules, the second main truss modules, and the third main truss modules, and remove the bolts between the adjacent first wing truss modules, the second wing truss modules, and the third wing truss modules, hoist the assembled truss module composed of the second main truss module and the second wing truss module as a whole, and use temporary supports to support and fix it; hoist the connecting truss module composed of the first main truss module and the first wing truss module, and the connecting truss module composed of the third main truss module and the third wing truss module in batches, and use temporary supports to support and fix them; bolt the second main truss module to the first main truss module and the third main truss module respectively, and bolt the second wing truss module to the first wing truss module and the third wing truss module respectively; S4, exhibition hall roof installation: install the large-span folded arch trusses one by one according to the above steps. Whenever one large-span folded arch truss is installed, continue to install the connecting flange or joint bearing between the two adjacent large-span folded arch trusses until all the installation is completed.

13. A construction method for an exhibition hall roof using a large-span folded arch truss, characterized in that: The following steps are involved: S1, carry out component production in a factory near the installation site: divide the main truss of each large-span folded arch truss into a first main truss module, a second main truss module, and a third main truss module connected by a first positioning flange in sequence, turn the second main truss module in the middle by 180 degrees as a whole, carry out horizontal production and transport to the site, turn the first main truss module and the third main truss module at the end excluding the first positioning flange by 180 degrees as a whole, carry out horizontal production and transport to the site as a whole; The wing truss in the arch truss is sequentially divided into a first wing truss module, a second wing truss module, and a third wing truss module connected by a second positioning flange. The second wing truss module in the middle is divided into two chord rods and multiple groups of connecting web rod units, which are separately manufactured and transported to the site. The second positioning flanges are respectively connected to the corresponding chord rods and the connecting web rod units. The first wing truss module and the second wing truss module at the end are respectively divided into two chord rods and multiple groups of connecting web rod units, which are separately manufactured and transported to the site. S2, on-site overall assembly: assembling and welding the second main truss module and the second wing truss module on the tire frame, assembling and welding the first main truss module and the first wing truss module on the tire frame, and assembling and welding the third main truss module and the third wing truss module on the tire frame; assembling the second main truss module, the second wing truss module, the first main truss module, the first wing truss module, the third main truss module, and the third wing truss module using virtual pre-assembly technology; Assembling and welding the first positioning flanges on the first main truss module and the third main truss module according to the virtual pre-assembly result, and assembling and welding the second positioning flanges on the first wing truss module and the third wing truss module; S3, on-site segmented hoisting: hoist the assembled truss module composed of the second main truss module and the second wing truss module as a whole and secure it with temporary supports; hoist the connecting truss module composed of the first main truss module and the first wing truss module, and the connecting truss module composed of the third main truss module and the third wing truss module in batches and secure them with temporary supports; bolt the second main truss module to the first main truss module and the third main truss module, respectively, and bolt the second wing truss module to the first wing truss module and the third wing truss module, respectively; S4, exhibition hall roof installation: install the large-span folded arch trusses one by one according to the above steps. Whenever one large-span folded arch truss is installed, continue to install the connecting flange or joint bearing between the two adjacent large-span folded arch trusses until all the installation is completed.

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