Large-span arc-shaped steel structure without support in middle and construction method

Abstract

The invention provides a large-span arc-shaped steel structure without a support in the middle and a construction method. The arc-shaped steel structure comprises an installation support, at least two arc-shaped steel bodies, a rail set and rolling mechanisms, the arc-shaped steel bodies and the rail set are fixedly installed on the installation support, the two ends of each arc-shaped steel body are each connected with one rolling mechanism, and the rolling mechanisms are arranged on the rail set in a sliding mode. The construction method comprises the following steps that S1, the rolling mechanisms are installed at the two ends of each arc-shaped steel body correspondingly; s2, the first arc-shaped steel body is hoisted to the mounting support, and at the moment, rolling mechanisms at the two ends of the first arc-shaped steel body are both in sliding connection with the track sets; s3, the first arc-shaped steel body is driven to move towards the preset construction position; and S4, the step S2 and the step S3 are circulated so that the multiple arc-shaped steel bodies can be hoisted and moved in sequence. In the application, the hoisting position of the arc-shaped steel body relative to the mounting bracket does not need to be adjusted by continuously adjusting the angle of the large hoisting equipment, so that the construction difficulty can be reduced, and the construction precision and the construction efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of building construction, and in particular to a large-span arc-shaped steel structure without support in the middle and a construction method thereof. Background Art

[0002] Large-span curved steel structures without support in the middle are widely used in the construction of large factories, multi-story residential buildings, etc. They have the advantages of simple construction and short construction period. In addition, when the buildings constructed by large-span curved steel structures without support in the middle are demolished, almost no construction waste will be generated, and the steel can be recycled, which has the advantage of being green and environmentally friendly.

[0003] When installing a large-span arc-shaped steel structure without support in the middle, it is necessary to use large-scale lifting equipment to lift the arc-shaped steel body to the top of the installation bracket, and then fix the arc-shaped steel body to the top of the installation bracket. During this period, it is necessary to continuously adjust the angle of the large-scale lifting equipment to adjust the lifting position of the arc-shaped steel body relative to the installation bracket, which makes the construction difficult, with low precision and low efficiency. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a large-span arc-shaped steel structure without support in the middle and a construction method, so as to solve the technical problems existing in the prior art of great construction difficulty, low precision and low efficiency.

[0005] To achieve the above purpose, the technical solution adopted in this application is: to provide a large-span arc-shaped steel structure without support in the middle and a construction method, including: Mounting bracket; At least two arc-shaped steel bodies, each of which is used to be fixed on the top of the mounting bracket, and each of which is arranged opposite to each other at intervals; A track assembly, the track assembly being fixedly mounted on the top of the mounting bracket; Rolling mechanism: two ends of each arc-shaped steel body are respectively connected with a rolling mechanism, and each rolling mechanism is slidably arranged on the track group.

[0006] Furthermore, the rolling mechanism includes a support and a roller assembly, the support is installed on the arc-shaped steel body, the support is an internally hollow cylinder, the top wall of the support is arranged facing the arc-shaped steel body, the bottom wall of the support is arranged facing the track group, the top wall and the bottom wall of the support are both connected with the internal cavity thereof, the roller assembly is detachably installed in the internal cavity of the support, and an escape space is provided between the top wall of the support and the arc-shaped steel body, which is connected with the internal cavity of the support and is used to pull out the roller assembly, and the roller assembly is slidably arranged on the track group.

[0007] Furthermore, the support has a pair of parallel side walls located between its top wall and bottom wall, and the two side walls of the support are respectively provided with guide grooves with curved groove walls. The track group includes at least two tracks arranged side by side, and the tracks have connected support portions and guide protrusions. The two guide grooves on each of the rolling mechanisms respectively correspond to the guide protrusions of a track, and the roller assembly of each rolling mechanism is slidably arranged on the guide protrusion of the corresponding track.

[0008] Furthermore, the track is a segmented track.

[0009] Furthermore, the large-span arc-shaped steel structure without support in the middle also includes an adjustment gasket, which is used to be laid between the support portion of each of the rails and the mounting bracket.

[0010] Furthermore, the rolling mechanism also includes a plurality of legs, and the support is mounted on the arc-shaped steel body through the plurality of legs arranged at intervals, and the avoidance space is formed between the plurality of legs arranged at intervals.

[0011] Furthermore, the arc-shaped steel body includes a pair of sub-arc-shaped steels, one end of the two sub-arc-shaped steels are connected, and the other end of the two sub-arc-shaped steels are respectively connected to one of the rolling mechanisms.

[0012] Furthermore, one end of the two sub-arc steels connected is respectively connected with a foot, each of the feet is connected with a rolling mechanism, and each of the feet is slidably arranged on the track group through a rolling mechanism.

[0013] Furthermore, a plurality of mutually parallel support rods are connected between every two adjacent arc-shaped steel bodies, and the plurality of support rods are evenly spaced and distributed along the extension direction of the arc-shaped steel body.

[0014] The present application also provides a construction method for a large-span curved steel structure without a support in the middle, using the large-span curved steel structure without a support in the middle, comprising the following steps: S1: A rolling mechanism is installed at both ends of each arc-shaped steel body; S2: hoisting the first arc-shaped steel body on the top of the mounting bracket, at which time, the rolling mechanisms at both ends of the first arc-shaped steel body are in sliding contact with the track assembly; S3: driving the first arc-shaped steel body to move to a preset construction position; S4: loop S2 and S3 to sequentially hoist and move the plurality of arc-shaped steel bodies.

[0015] The beneficial effects of the large-span arc-shaped steel structure without support in the middle and the construction method provided by the present application are: When installing the large-span arc-shaped steel structure with no support in the middle provided by the present application, a rolling mechanism is first installed at each end of the arc-shaped steel body, and then the arc-shaped steel body is hoisted to the top of the installation bracket using large-scale lifting equipment. At this time, the rolling mechanisms at both ends of the arc-shaped steel body are slidably connected with the track group. Thereafter, the arc-shaped steel body is driven to move along the track group to a preset construction position, and the arc-shaped steel body is fixedly connected to the top of the installation bracket. During this process, there is no need to continuously adjust the angle of the large-scale lifting equipment to adjust the lifting position of the arc-shaped steel body relative to the installation bracket, which can reduce the construction difficulty and improve the construction accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the overall structure of a large-span arc-shaped steel structure without support in the middle provided in an embodiment of the present application; Figure 2 A schematic diagram of the connection between the arc-shaped steel body and the track assembly provided in an embodiment of the present application; Figure 3 for Figure 2 A partial enlarged view of the middle A; Figure 4 A schematic diagram of the internal structure of a rolling mechanism provided in an embodiment of the present application; Figure 5 for Figure 1 A partial enlarged view of point B in the middle; Figure 6 A partial cross-sectional view provided for an embodiment of the present application; Figure 7 A flow chart of a construction method for a large-span curved steel structure without support in the middle provided in an embodiment of the present application.

[0018] Among them, the reference numerals in the figure are: 1. Install the bracket; 2. Arc steel body; 21. Sub-arc steel; 3. Track assembly; 31. Track; 311. Support portion; 312. Guide protrusion; 4. rolling mechanism; 41. support; 42. roller assembly; 43. avoidance space; 44. guide groove; 45. outrigger; 5. Adjust the gasket; 6. Support legs; 7. Support rod; 71. Support sleeve; 72. Slide groove; 73. Sliding rod; 74. Threaded rod; 75. Locking nut. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present 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, and therefore should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] See also Figures 1 to 6 The embodiment of the present application provides a large-span arc-shaped steel structure without support in the middle, including a mounting bracket 1, at least two arc-shaped steel bodies 2, a track group 3 and a rolling mechanism 4. The number of the arc-shaped steel bodies 2 can be set to two, three, four or other numbers according to specific construction requirements, and is not limited here. Each arc-shaped steel body 2 is used to be fixed on the top of the mounting bracket 1, and each arc-shaped steel body 2 is arranged opposite to each other, that is, each arc-shaped steel body 2 is arranged in the same direction and along the same direction. Figure 1 The track group 3 is fixed on the top of the mounting bracket 1. The two ends of each arc-shaped steel body 2 are respectively connected with a rolling mechanism 4, and each rolling mechanism 4 is slidably arranged on the track group 3.

[0024] In the prior art, the arc-shaped steel body 2 is usually hoisted directly to the preset construction position on the mounting bracket 1 by large-scale hoisting equipment. The process of adjusting the position of the arc-shaped steel body 2 is not easy to control and difficult to quickly and accurately position, so it has the disadvantages of great construction difficulty, low construction accuracy and low construction efficiency. When installing the large-span arc-shaped steel structure with no support in the middle provided by this embodiment, a rolling mechanism 4 is first installed at both ends of the arc-shaped steel body 2, and then the arc-shaped steel body 2 is hoisted to the top of the mounting bracket 1 by large-scale hoisting equipment. At this time, the rolling mechanisms 4 at both ends of the arc-shaped steel body 2 are slidably connected with the track group 3. Thereafter, an external driving device, such as a hydraulic device or a pneumatic device, is used to drive the arc-shaped steel body 2 to move along the track group 3 to the preset construction position, and the arc-shaped steel body 2 is fixedly connected to the top of the mounting bracket 1. In this process, it is not necessary to adjust the angle of the large-scale hoisting device continuously to adjust the hoisting position of the arc-shaped steel body 2 relative to the mounting bracket 1, so that the construction difficulty can be reduced and the construction accuracy and construction efficiency can be improved.

[0025] In one embodiment of the present application, see Figures 1 to 6 The rolling mechanism 4 includes a support 41 and a roller assembly 42. The support 41 is mounted on the arc-shaped steel body 2. The support 41 is a hollow cylinder. The top wall of the support 41 is arranged facing the arc-shaped steel body 2, and the bottom wall of the support 41 is arranged facing the track group 3. The top wall and the bottom wall of the support 41 are both connected with the internal cavity thereof. The roller assembly 42 is detachably mounted in the internal cavity of the support 41. An escape space 43 is provided between the top wall of the support 41 and the arc-shaped steel body 2, which is connected with the internal cavity of the support 41 and used to withdraw the roller assembly 42. The roller assembly 42 is slidably mounted on the track group 3. It should be noted that the roller assembly 42 can be detachably mounted in the internal cavity of the support 41 by the cooperation of a screw and a threaded hole, the cooperation of a pin and a cylindrical hole, or other existing detachable connection methods.

[0026] Since the support 41 is an internally hollow cylinder, the roller assembly 42 can be detachably installed in the internal cavity of the support 41, and an escape space 43 connected to the internal cavity of the support 41 and used to withdraw the roller assembly 42 is provided between the top wall of the support 41 and the arc-shaped steel body 2. Therefore, in the actual construction process, when the arc-shaped steel body 2 is moved to the preset construction position, the roller assembly 42 can be pulled out of the support 41 from the internal cavity of the support 41 through the escape space 43, so that the roller assembly 42 can be recycled, which has the advantage of being green and environmentally friendly.

[0027] Specifically, the rolling mechanism 4 further includes a plurality of legs 45, and the support 41 is installed on the arc-shaped steel body 2 through the plurality of legs 45 arranged at intervals, and an escape space 43 is formed between the plurality of legs 45 arranged at intervals. The number of the legs 45 can be set to two, three, four or other numbers, which are not limited here, and preferably four, which has a strong supporting capacity and is convenient for forming an escape space 43.

[0028] During the actual construction process, when the arc-shaped steel body 2 is moved to the preset construction position, the roller assembly 42 can be pulled out of the support 41 from the internal cavity of the support 41 through the avoidance space 43 formed between the multiple legs 45, so that the roller assembly 42 can be recycled, which has the advantage of being green and environmentally friendly.

[0029] In one embodiment of the present application, see Figures 1 to 6 The support 41 has a pair of parallel side walls between its top wall and bottom wall. The two side walls of the support 41 are respectively provided with guide grooves 44 with curved groove walls. The track group 3 includes at least two tracks 31 arranged side by side. The track 31 has a connected support portion 311 and a guide protrusion 312. The two guide grooves 44 on each rolling mechanism 4 are respectively matched with the guide protrusion 312 of a track 31. The roller assembly 42 of each rolling mechanism 4 is slidably arranged on the guide protrusion 312 of the corresponding track 31. Among them, the support portion 311 and the guide protrusion 312 of each track 31 are along Figure 1 The rails 31 extend in the X direction, and are parallel to each other. In addition, taking the rail group 3 including two rails 31 arranged side by side as an example, the two rolling mechanisms 4 at both ends of the arc-shaped steel body 2 are slidably connected with the two rails 31 in a one-to-one correspondence.

[0030] After the arc-shaped steel body 2 is hoisted to the top of the mounting bracket 1, since the two side walls of the support 41 are respectively provided with guide grooves 44 with curved groove walls, and the track 31 has guide protrusions 312 for matching with the two guide grooves 44 on the rolling mechanism 4, the guide grooves 44 with curved groove walls can guide and position the guide protrusions 312, thereby facilitating rapid sliding connection between each rolling mechanism 4 and the track 31.

[0031] In one embodiment of the present application, see Figures 1 to 6 , the track 31 is a segmented track 31.

[0032] Since the track 31 adopts a segmented track 31 structure, when the track 31 is transported to the construction site, the track 31 can be disassembled first and then assembled at the construction site, which has the advantage of convenient transportation. In addition, when a part of the track 31 is damaged, it is convenient to replace the damaged part without replacing the entire track 31, which has a low maintenance cost.

[0033] Furthermore, the large-span arc-shaped steel structure without support in the middle also includes an adjustment gasket 5, which is used to be laid between the support portion 311 of each track 31 and the mounting bracket 1. It should be noted that one, two, three or other number of adjustment gaskets 5 can be arranged between the support portion 311 of each track 31 and the mounting bracket 1, and the number of adjustment gaskets 5 can be selected according to the actual construction site conditions, and is not limited here.

[0034] Due to the complex conditions at the actual construction site, there may be an uneven ground, which may lead to different heights at different locations on the top of the mounting bracket 1 and poor connections between the sections of the segmented track 31. Therefore, in this embodiment, one or more adjustment gaskets 5 can be flexibly arranged between the support portions 311 of each section of the track 31 and the mounting bracket 1 to make the top of the mounting bracket 1 on the same horizontal line, thereby making the sections of the segmented track 31 smoothly connected, thereby ensuring that the arc-shaped steel body 2 can slide smoothly on the track group 3.

[0035] In one embodiment of the present application, see Figures 1 to 6 The arc-shaped steel body 2 includes a pair of sub-arc-shaped steels 21 , one end of the two sub-arc-shaped steels 21 are connected, and the other ends of the two sub-arc-shaped steels 21 are respectively connected to a rolling mechanism 4 .

[0036] Since the arc-shaped steel body 2 adopts a split structure, when the arc-shaped steel body 2 is transported to the construction site, the arc-shaped steel body 2 can be first split into a pair of sub-arc-shaped steels 21 and then assembled at the construction site, which has the advantage of convenient transportation.

[0037] Furthermore, one end of the two sub-arc steels 21 connected is respectively connected to a leg 6, each leg 6 is connected to a rolling mechanism 4, and each leg 6 is slidably mounted on the track group 3 through a rolling mechanism 4. It should be noted that after the two sub-arc steels 21 are moved to the preset construction position, the leg 6 also needs to be fixed on the top of the mounting bracket 1. In addition, it should be noted that in this embodiment, the track group 3 includes at least four tracks 31 arranged side by side, the two rolling mechanisms 4 on the two sub-arc steels 21 are slidably connected with two of the tracks 31 in a one-to-one correspondence, and the two rolling mechanisms 4 on the two legs 6 are slidably connected with the other two tracks 31 in a one-to-one correspondence.

[0038] In this embodiment, a leg 6 is connected to one end where the two sub-arc steels 21 are connected, and each leg 6 is connected to a rolling mechanism 4. Each leg 6 is slidably mounted on the track group 3 through a rolling mechanism 4, so that multi-point support can be formed between each sub-arc steel 21 and the track group 3, thereby improving the stability of the overall structure.

[0039] In one embodiment of the present application, see Figures 1 to 6A plurality of mutually parallel support rods 7 are connected between every two adjacent arc-shaped steel bodies 2, and the plurality of support rods 7 are evenly spaced and distributed along the extension direction of the arc-shaped steel bodies 2.

[0040] In this embodiment, by setting a plurality of mutually parallel support rods 7 between every two adjacent arc-shaped steel bodies 2, an installation position can be formed between every two adjacent support rods 7 in the extension direction of the arc-shaped steel body 2 for installing a glass curtain wall or a protective roof, etc., so as to meet various practical usage requirements.

[0041] In one embodiment of the present application, see Figures 1 to 6 The support rod 7 includes a support sleeve 71, a slide groove 72, a sliding rod 73, a threaded rod 74 and a locking nut 75. The support sleeve 71 is detachably installed between any two adjacent arc-shaped steel bodies 2, the slide groove 72 is provided in the support sleeve 71, the sliding rod 73 is slidably installed in the support sleeve 71, the threaded rod 74 is connected to the sliding rod 73 and is inserted into the slide groove 72, and the locking nut 75 is screwed to the threaded rod 74 and is located outside the support sleeve 71.

[0042] It should be noted that in this embodiment, the end of the support sleeve 71 is bolted to the arc-shaped steel body 2. Of course, in other embodiments, other installation methods can be used according to actual application requirements, which is not limited here.

[0043] In actual application, the support sleeve 71 is directly installed on the arc-shaped steel body 2 by bolts, which will cause the shear stress between the support sleeve 71 and the arc-shaped steel body 2 to be concentrated on the bolts, which may easily cause brittle fracture of the bolts, thereby causing the support sleeve 71 and the arc-shaped steel body 2 to separate.

[0044] In this embodiment, before the support sleeve 71 is installed on the arc-shaped steel body 2, the sliding rod 73 is first slid into the support sleeve 71 so that the sliding rod 73 is completely covered by the support sleeve 71, and then the support sleeve 71 is installed on the arc-shaped steel body 2 by bolts. After the support sleeve 71 is installed on the arc-shaped steel body 2, the sliding rod 73 is moved so that the sliding rod 73 passes through the arc-shaped steel body 2 until the sliding rod 72 slides into the adjacent support sleeve 71, and then the locking nut 75 can be rotated to lock the sliding rod 72. Compared with the related art, the sliding rod 73 can be shear-resistant together with the bolt, which helps to improve the structural stability between the support sleeve 71 and the arc-shaped steel body 2, thereby helping to improve the bearing performance of the support sleeve 71. During use, the threaded rod 74 and the locking nut 75 can be used to fix the sliding rod 73 to prevent the sliding rod 73 from sliding during use, and ensure that the sliding rod 73 is always located between two adjacent support sleeves 71. During use, the threaded rod 74 can be avoided through the sliding groove 72; and it is convenient for workers to use the threaded rod 74 to drive the sliding rod 73 to slide, which helps to improve the convenience of use.

[0045] See also Figures 1 to 7 The present application also provides a construction method for a large-span arc-shaped steel structure without support in the middle, using the large-span arc-shaped steel structure without support in the middle, comprising the following steps: S1: Assemble the mounting bracket 1 at the construction site, assemble the segmented track 31 at the construction site and fix it on the top of the mounting bracket 1, assemble two sub-arc steels 21 at the construction site to form an arc steel body 2, assemble a foot 6 on each of the two sub-arc steels 21, and install a rolling mechanism 4 at both ends of each arc steel body 2 and each foot 6.

[0046] S2: The first arc-shaped steel body 2 is hoisted on the top of the mounting bracket 1. At this time, the rolling mechanisms 4 at both ends of the first arc-shaped steel body 2 and the rolling mechanisms 4 of the two legs 6 on the first arc-shaped steel body 2 are all in sliding connection with the track group 3.

[0047] S3: driving the first arc-shaped steel body 2 to move to the preset construction position, and fixing the first arc-shaped steel body 2 and the two legs 6 on the first arc-shaped steel body 2 at the preset construction position on the top of the mounting bracket 1 .

[0048] S4: loop S2 and S3 to sequentially hoist and move the plurality of arc-shaped steel bodies 2.

[0049] S5: A plurality of mutually parallel support rods 7 are connected between every two adjacent arc-shaped steel bodies 2 , and the plurality of support rods 7 are evenly spaced and distributed along the extending direction of the arc-shaped steel bodies 2 .

[0050] Specifically, after the first arc-shaped steel body 2 is hoisted to the top of the mounting bracket 1 by using large-scale hoisting equipment, an external driving device is used to drive the first arc-shaped steel body 2 to slide along the track group 3 to move to a preset construction position. At the same time, the second arc-shaped steel body 2 is hoisted to the top of the mounting bracket 1 by using large-scale hoisting equipment, and then an external driving device is used to drive the second arc-shaped steel body 2 to slide along the track group 3 to move to the preset construction position, and so on, to hoist and move multiple arc-shaped steel bodies 2 in sequence.

[0051] In the prior art, the arc-shaped steel body 2 is usually hoisted directly to the preset construction position on the mounting bracket 1 by large-scale hoisting equipment. The process of adjusting the position of the arc-shaped steel body 2 is not easy to control and difficult to quickly and accurately position, so it has the disadvantages of great construction difficulty, low construction accuracy and low construction efficiency. The construction method of the large-span arc-shaped steel structure without support in the middle provided by this embodiment is to first install a rolling mechanism 4 at both ends of each arc-shaped steel body 2, and then hoist the arc-shaped steel body 2 to the top of the mounting bracket 1 by large-scale hoisting equipment. At this time, each rolling mechanism 4 at both ends of the arc-shaped steel body 2 is slidably connected with the track group 3. Thereafter, an external driving member, such as a hydraulic device or a pneumatic device, is used to drive the arc-shaped steel body 2 to move along the track group 3 to the preset construction position, and the arc-shaped steel body 2 is fixedly connected to the top of the mounting bracket 1. In this process, it is not necessary to adjust the angle of the large-scale hoisting equipment continuously to adjust the hoisting position of the arc-shaped steel body 2 relative to the mounting bracket 1, so that the construction difficulty can be reduced and the construction accuracy and construction efficiency can be improved. In addition, compared to the prior art, in which one arc-shaped steel body 2 is hoisted to the top of the mounting bracket 1 and its position relative to the mounting bracket 1 is adjusted before another arc-shaped steel body 2 can be hoisted, the construction method provided in this embodiment is that among the two adjacent arc-shaped steel bodies 2, the second arc-shaped steel body 2 can be hoisted while the previous arc-shaped steel body 2 is moved. The construction steps are compact, which can further improve the overall construction efficiency.

[0052] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A large-span arc-shaped steel structure without support in the middle, characterized in that: include: Mounting bracket (1); At least two arc-shaped steel bodies (2), each of the arc-shaped steel bodies (2) being used to be fixedly mounted on the top of the mounting bracket (1), and each of the arc-shaped steel bodies (2) being arranged opposite to each other at intervals; A track assembly (3), the track assembly (3) being fixedly mounted on the top of the mounting bracket (1); A rolling mechanism (4), wherein both ends of each of the arc-shaped steel bodies (2) are respectively connected to a rolling mechanism (4), and each of the rolling mechanisms (4) is slidably mounted on the track assembly (3).

2. The large-span arc-shaped steel structure without support in the middle as claimed in claim 1, characterized in that: The rolling mechanism (4) comprises a support (41) and a roller assembly (42); the support (41) is mounted on the arc-shaped steel body (2); the support (41) is a column with a hollow interior; the top wall of the support (41) is arranged facing the arc-shaped steel body (2); the bottom wall of the support (41) is arranged facing the track group (3); the top wall and the bottom wall of the support (41) are both connected to the internal cavity thereof; the roller assembly (42) is detachably mounted in the internal cavity of the support (41); an escape space (43) connected to the internal cavity of the support (41) and used for withdrawing the roller assembly (42) is provided between the top wall of the support (41) and the arc-shaped steel body (2); the roller assembly (42) is slidably mounted on the track group (3).

3. The large-span arc-shaped steel structure without support in the middle as claimed in claim 2, characterized in that: The support (41) has a pair of mutually parallel side walls located between its top wall and bottom wall, and the two side walls of the support (41) are respectively provided with guide grooves (44) with groove walls in the shape of curved surfaces. The track group (3) comprises at least two tracks (31) arranged side by side, and the track (31) has a connected support portion (311) and a guide protrusion (312). The two guide grooves (44) on each rolling mechanism (4) are respectively matched with the guide protrusion (312) of one track (31), and the roller assembly (42) of each rolling mechanism (4) is slidably arranged on the guide protrusion (312) of the corresponding track (31).

4. The large-span arc-shaped steel structure without support in the middle as claimed in claim 3, characterized in that: The track (31) is a segmented track (31).

5. The large-span arc-shaped steel structure without support in the middle as claimed in claim 3, characterized in that: The large-span arc-shaped steel structure without support in the middle also includes an adjustment gasket (5), and the adjustment gasket (5) is used to be laid between the support portion (311) of each track (31) and the mounting bracket (1).

6. The large-span arc-shaped steel structure without central support as claimed in claim 2 or 3, characterized in that: The rolling mechanism (4) further comprises a plurality of legs (45); the support (41) is mounted on the arc-shaped steel body (2) via the plurality of legs (45) arranged at intervals; the avoidance space (43) is formed between the plurality of legs (45) arranged at intervals.

7. The large-span arc-shaped steel structure without central support as claimed in any one of claims 1 to 5, characterized in that: The arc-shaped steel body (2) comprises a pair of sub-arc-shaped steels (21), one end of the two sub-arc-shaped steels (21) being connected, and the other end of the two sub-arc-shaped steels (21) being respectively connected to one of the rolling mechanisms (4).

8. The large-span arc-shaped steel structure without support in the middle as claimed in claim 7, characterized in that: One end of the two sub-arc-shaped steels (21) connected is respectively connected to a foot (6), each of the feet (6) is connected to a rolling mechanism (4), and each of the feet (6) is slidably mounted on the track assembly (3) via a rolling mechanism (4).

9. The large-span arc-shaped steel structure without central support as claimed in any one of claims 1 to 5, characterized in that: A plurality of mutually parallel support rods (7) are connected between every two adjacent arc-shaped steel bodies (2), and the plurality of support rods (7) are evenly spaced and distributed along the extension direction of the arc-shaped steel bodies (2).

10. A construction method for a large-span arc-shaped steel structure without support in the middle, characterized in that: The method of using a large-span arc-shaped steel structure without a central support as claimed in any one of claims 1 to 9 comprises the following steps: S1: A rolling mechanism (4) is installed at each end of the arc-shaped steel body (2); S2: hoisting the first arc-shaped steel body (2) on the top of the mounting bracket (1), at which time the rolling mechanisms (4) at both ends of the first arc-shaped steel body (2) are in sliding contact with the track assembly (3); S3: driving the first arc-shaped steel body (2) to move to a preset construction position; S4: loop S2 and S3 to sequentially hoist and move the plurality of arc-shaped steel bodies (2).

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