Bracket structure for grid roof reconstruction
By installing support structures at the purlin positions of elevated rail transit stations, the problem of insufficient strength of the space frame structure was solved, enabling a rapid increase in load-bearing capacity without affecting operation and meeting the renovation requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-03
AI Technical Summary
During the renovation of elevated rail transit stations, the existing grid structure and purlins are not strong enough to meet the renovation requirements. Moreover, the construction must be completed within a limited window of opportunity and without affecting operations, and noise control requirements are strict.
A support structure, including purlin brackets and connecting plates, is installed at the location of the existing purlins and fixed with bolts to increase the load-bearing capacity of the new main purlins. Shear stiffening ribs are set between the purlin brackets to improve structural stability.
The new main purlins were installed quickly and without damage, which improved the load-bearing capacity of the steel grid roof, met the renovation requirements, and was completed without affecting operation.
Smart Images
Figure CN224078762U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel structure reinforcement technology, specifically to a support structure for the renovation of space frame roofs. Background Technology
[0002] The existing roofs of elevated rail transit stations are mostly steel space frame structures, with a roof dead load design limit of 0.2 to 0.3 kN / m. 2 This load includes all enclosure structures above the spherical nodes of the space frame, such as purlin supports, purlins, roof panels and their connectors.
[0003] Currently, purlins are installed at the ball joints along the longitudinal direction of existing elevated rail transit stations. A single layer of color-coated steel sheet is mounted on the purlins, and the actual roof dead load is 0.1 kN / m. 2 Left and right, meeting design requirements.
[0004] However, when renovating existing elevated rail transit stations, for example, replacing the roof panels with aluminum-magnesium-manganese panels according to renovation requirements, the self-weight of the roof panels is calculated to be between 0.25 and 0.30 kN / m based on the roof panel structure. 2 Around this time, there is a possibility that the existing space frame structure and purlins may lack sufficient strength or stability. Meanwhile, subway operations cannot be interrupted, and all construction must be completed within designated maintenance windows. However, the number of maintenance windows each week is limited, requiring close cooperation from multiple parties. Furthermore, after construction, the space frame must be covered to prevent any exposure that could affect operations. In addition, maintenance windows are all located in the early morning, subject to noise control requirements.
[0005] Therefore, how to solve the above problems is a technical problem that needs to be addressed by existing technologies. Summary of the Invention
[0006] The purpose of this utility model is to address the shortcomings of the existing technology by providing a support structure for the renovation of a space frame roof. By setting a support structure at the location of the existing space frame ball joint to accommodate the installation of the new main purlin, the new main purlin can be installed quickly and without damage. Furthermore, the installation of the new main purlin increases the load-bearing capacity of the steel space frame roof structure, thereby meeting the renovation requirements.
[0007] The objective of this utility model is achieved through the following technical solution:
[0008] A support structure for retrofitting a space frame roof is provided for installing a new main purlin at the location of an existing purlin. The existing purlin is installed on a space frame ball joint with an existing purlin support. The support structure comprises two identical purlin support brackets, which are connected and fixed together by connectors to form a clamping space that matches the existing purlin support of the space frame ball joint, so that the support structure clamps around the periphery of the existing purlin support. A connecting plate is provided on the purlin support bracket for supporting the new main purlin.
[0009] The connecting plate has pre-drilled holes for connecting and fixing to the newly added main purlin.
[0010] The connecting plate has a plurality of connection holes.
[0011] A shear stiffening rib extends between the purlin bracket and the connecting plate, and the shear stiffening rib is located below the connecting plate.
[0012] Each of the two purlin brackets has a wing plate, and each wing plate has a bolt fixing hole. The wing plates of the two purlin brackets are connected and fixed by screwing bolts into the bolt fixing holes.
[0013] Multiple bolt fixing holes are provided in the height direction of the wing plate.
[0014] The advantages of this utility model are: simple and reasonable structure, quick and non-destructive on-site installation, and stable installation of the new main purlin; high degree of prefabrication, modular design for various working conditions, and suitable for promotion. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the installation structure of this utility model;
[0017] Figure 3 This is a schematic diagram of the arrangement structure of this utility model. Detailed Implementation
[0018] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:
[0019] like Figure 1-3 As shown in the figure, the numbers 1-13 represent: first purlin support 1, second purlin support 2, connecting plate 3, connecting hole 4, wing plate 5, bolt fixing hole 6, shear stiffening rib 7, existing purlin 8, space frame ball joint 9, support structure 10, existing purlin support 11, newly added main purlin 12, and newly added secondary purlin 13.
[0020] Example: Figure 2 or Figure 3 As shown, in this embodiment, the support structure for the renovation of the space frame roof is used to add a new main purlin 12 at the existing purlin 13 to improve the load-bearing capacity when the load-bearing capacity of the existing purlin 8 does not meet the design requirements of the upper dead load. The existing purlin 8 is supported by the existing purlin support 11 below, and the existing purlin support 11 is provided with a space frame ball joint 9 for connecting the nodes of the steel space frame structure.
[0021] Specifically, such as Figure 1 As shown, the support structure in this embodiment includes a first purlin support bracket 1 and a second purlin support bracket 2. Both purlin support brackets have a semi-circular structure, and outwardly extending wing plates 5 are respectively provided on the sides of the semi-circular structure. Bolt fixing holes 6 are respectively opened on the wing plates 5. When the first purlin support bracket 1 and the second purlin support bracket 2 are spliced, the bolt fixing holes on their respective wing plates are aligned and bolts are screwed in to fix the first purlin support bracket 1 and the second purlin support bracket 2. At this time, combined with Figure 1 and Figure 3 As shown, the enclosing area formed by the first purlin bracket 1 and the second purlin bracket 2 is well matched with the outer contour shape and size of the existing purlin bracket 11, so that the support structure 11 formed by the first purlin bracket 1 and the second purlin bracket 2 can be quickly and seamlessly enclosed and fixed at the outer periphery of the existing purlin bracket 11.
[0022] like Figure 1 As shown, connecting plates 3 extending outwards are respectively provided on the upper part of the semi-circular structure of the first purlin support 1 and the second purlin support 2. These connecting plates 3 are used to provide stable support for the newly added main purlin 12 supported above. Combined with... Figures 1 to 3 As shown, in this embodiment, two connection holes 4 are provided on the connecting plate 3. The two connection holes 4 can be simply connected to the newly added main purlin 12 above by bolts or other connecting parts, thereby ensuring that the newly added main purlin 12 can be effectively and stably supported by the connecting plate 3, while further increasing the structural stability and safety of the newly added main purlin 12.
[0023] like Figure 1 As shown, in order to ensure the structural strength and stability of the connecting plate 3, shear stiffening ribs 7 are respectively provided below the connecting plate 3 of the first purlin support 1 and the second purlin support 2. The shear stiffening ribs 7 extend along the extension direction of the connecting plate 3 and are of equal length, thereby increasing the load-bearing capacity of the connecting plate 3.
[0024] In this embodiment, as Figure 3 As shown, when the added main purlin 12 still cannot meet the design requirements of the upper dead load to a certain extent, additional secondary purlins 13 can be added between the added main purlins 12.
[0025] In this embodiment, during construction, since the purlins of the steel space frame structure are connected and transmit force through the space frame ball nodes 9 and the members, it is also necessary to reinforce the members and perform structural system verification when adding new main purlins 12 or further adding new secondary purlins 13 on this basis.
[0026] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.
Claims
1. A bracket structure for grid roof retrofit, for installing a new main purlin at the position of an existing purlin installed above a grid sphere joint with an existing purlin bracket, characterized in that: The supporting structure comprises two structurally identical purlin supports, the two purlin supports are connected and fixed by a connecting piece and are spliced to form a holding space matched with the existing purlin of the net rack spherical joint, so that the supporting structure is held on the periphery of the existing purlin, a connecting plate is arranged on the purlin support, and the connecting plate is used to support the new main purlin.
2. The cradle structure for the roof reconstruction of a grid structure according to claim 1, characterized in that: A connecting hole is reserved on the connecting plate for connecting and fixing the new main purlin.
3. The cradle structure for the roof reconstruction of a grid structure according to claim 2, characterized in that: A plurality of connecting holes are reserved on the connecting plate.
4. The cradle structure for the roof reconstruction of a grid structure according to claim 1, characterized in that: A shear-resistant stiffening rib plate is arranged between the purlin support and the connecting plate and is located below the connecting plate.
5. The cradle structure for the roof reconstruction of a space truss according to claim 1, wherein: The two purlin supports are respectively provided with wing plates, bolt fixing holes are respectively formed in the wing plates, and the wing plates of the two purlin supports are connected and fixed by means of bolts screwed into the bolt fixing holes.
6. A cradle structure for roof retrofitting of a space grid according to claim 5, characterized in that: A plurality of bolt fixing holes are arranged in the height direction of the wing plate.