Temporary supporting structure of large-span annular laminated open-web truss system

Abstract

The utility model provides a temporary supporting structure of a large-span annular laminated open-web truss system, which relates to the technical field of supporting structures and comprises a plurality of symmetrically arranged supporting columns on two sides and a plurality of connecting columns in the middle, the adjacent supporting columns, the adjacent connecting columns and the supporting columns and the connecting columns are connected through a plurality of connecting beams. The tops of the multiple supporting columns on the same side are connected through a bridging piece, a sand box is arranged on the tops of the supporting columns, and the large-span annular laminated open-web truss system is arranged at the upper end of the sand box. The supporting structure is convenient to dismantle in the later period, and the influence of dismantling on the annular laminated open-web truss can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of support structures, in particular to a temporary support structure of a large-span annular laminated vierendelle truss system. Background Art

[0002] Laminated Vierendeel trusses offer high stiffness and space utilization, offering significant advantages in achieving building form and satisfying structural functions. Design firms often design large-span Vierendeel truss structures only for the post-construction operational phase. During construction, as structural layers are added and the strength and stiffness of each component gradually develop during the construction of each layer, the entire load-bearing system undergoes continuous stress redistribution. Therefore, temporary supports are required at the bottom of the laminated Vierendeel trusses during construction until the structural system is formed and reaches its designed strength.

[0003] The Beijing-Hangzhou Grand Canal Museum project features a unique architectural facade. Above the ninth floor, the atrium is a circular "outdoor space" enclosed by a large-span laminated Vierendeel truss structure. The circular laminated Vierendeel trusses, with a maximum span of 36.6 meters, are symmetrically arranged on the east and west sides. Temporary supports were required during construction. The laminated Vierendeel trusses are curved, with the bottom chord 51.6 meters above the foundation slab, necessitating high temporary support requirements. Using traditional full-height heavy-duty support trusses would require erection from the foundation slab, resulting in long lease periods and high costs, space consuming, and inconvenient cross-construction. Furthermore, it would be difficult to ensure center alignment between the upper and lower trusses, potentially leading to floor failure due to excessive shear forces. Traditional split-level trusses and Bailey trusses, while simple, lack sufficient bending resistance due to the curved shape and large spans of the Vierendeel trusses. Furthermore, the limited access surface makes Vierendeel truss construction difficult. However, support methods such as lattice columns or steel circular tube columns may cause excessive deformation of the steel, making it impossible to effectively control the deflection of the hollow truss during construction, which will inevitably affect the structural safety and the flatness of the building roof. Summary of the Invention

[0004] In view of the above-mentioned prior art, the present invention proposes a temporary support structure of a large-span annular laminated vierendelle truss system.

[0005] The utility model provides a temporary support structure of a large-span annular laminated hollow truss system, which includes several support columns on both sides and several connecting columns in the middle, wherein the adjacent support columns, the adjacent connecting columns and the support columns and the connecting columns are connected by multiple connecting beams, and the tops of the several support columns on the same side are connected by cantilevers. A sand box is provided on the top of the support column, and the large-span annular laminated hollow truss system is arranged at the upper end of the sand box.

[0006] Preferably, the plurality of support columns on the same side are in an arc shape.

[0007] Preferably, the lifting plate is configured as an arc-shaped structure.

[0008] Preferably, eight support columns are provided and symmetrically distributed on both sides, and four connection columns are provided and symmetrically distributed in the middle of the support columns on both sides.

[0009] Preferably, the connecting beams are provided with nine layers.

[0010] Preferably, the support columns, connecting columns and connecting beams are all made of reinforced concrete and are interconnected to form a lattice frame structure.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The utility model proposes a temporary support structure of a large-span annular laminated Vierendeel truss system, which adopts a reinforced concrete lattice frame structure with a simple structural form and good integrity. The arrangement of the support columns can match the curvature of the laminated Vierendeel trusses, ensuring that the load during the construction process is effectively transferred to the support structure.

[0013] 2. The support structure of the present invention utilizes the characteristic of small compression deformation of reinforced concrete to effectively control the vertical deformation of the hollow truss and reduce the deflection of the hollow truss.

[0014] 3. The support structure of the present invention is fixedly connected to the foundation slab, and the load is mainly transferred to the foundation slab, which reduces the damage and impact on the original main structure. Moreover, the support structure and the main structure are constructed simultaneously, which can achieve effective interweaving and reasonably control the construction period.

[0015] 4. The support structure of the present invention is a one-time investment with good economic efficiency, avoiding the defect of uncontrollable steel rental cycle and effectively reducing the cost of the measure.

[0016] 5. A sand box is provided on the top of the support structure of the utility model, which facilitates the dismantling of the support structure in the later stage and reduces the impact of the dismantling on the annular laminated hollow truss. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a temporary support structure of a large-span annular laminated Vierendeel truss system in an embodiment of the present utility model.

[0018] Figure 2 It is a plan view of the implementation of the temporary support structure of the large-span annular laminated Vierendeel truss system in the embodiment of the present utility model.

[0019] Figure 3 It is a three-dimensional schematic diagram of the implementation of the temporary support structure of the large-span annular laminated Vierendeel truss system in the embodiment of the present utility model.

[0020] In the figure, 1. Support column; 2. Connection column; 3. Connection beam; 4. Cantilever plate; 5. Sand box; 6. Foundation slab; 7. Second-basement structural floor slab; 8. First-basement structural floor slab; 9. Large-span annular laminated vierendezvous truss system. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0022] Example: Figure 1-Figure 3 As shown, a temporary support structure of a large-span annular laminated holder truss system includes eight support columns 1 symmetrically arranged on both sides and four connecting columns 2 in the middle. The cross-sectional centroid of the support column 1 coincides with the centroid of the large-span annular laminated holder truss system 9, and the four support columns 1 on the same side are in an arc-shaped state. The support column 1 is the main supporting component of the large-span annular laminated holder truss system 9.

[0023] Furthermore, adjacent support columns 1, adjacent connecting columns 2, and support columns 1 and connecting columns 2 are connected by multiple connecting beams 3. Nine layers of connecting beams 3 are provided, which can reduce the spacing between support columns 1 and reduce the load. The support columns 1 and connecting columns 2 are all fixedly connected to the foundation slab 6, the second-basement structural floor slab 7, and the first-basement structural floor slab 8. The support columns 1, connecting columns 2, and connecting beams 3 are all made of reinforced concrete and interconnected to form a lattice frame structure, which increases the overall stability and horizontal lateral stiffness of the support structure.

[0024] Furthermore, the tops of the four support columns on the same side are connected by an arc-shaped cantilever plate 4. This cantilever plate 4 is formed by the connecting beam between the top of the support structure and the lower chord of the large-span annular laminated holier-web truss system 9, which cantilevers out to both sides. The cantilever plate 4 is 200mm wider than the width of the lower chord and serves as the support point for the lower chord formwork of the large-span annular laminated holier-web truss system 9, preventing the formwork from being supported on the lower structural floor and affecting the load on the structural floor. A sand box 5 is installed in the middle of the top of each support column 1 to provide support and facilitate the subsequent removal of the support structure, reducing the impact of the removal operation on the large-span annular laminated holier-web truss system 9.

[0025] During construction, the support structure was constructed simultaneously with the main structure below the large-span annular laminated Vierendeel truss system 9. Construction of the main structure in the collision zone was delayed in areas where it collided with the main structure to prevent deformation with the frame and potential structural damage. A top-retracting mechanism was implemented at the cantilevered locations of the concrete beams. The steel beams were not welded, but secured with overlapping slabs. Welding was only permitted after the temporary support frame was removed. The top and bottom plates of the sandbox 5 were fixed to the bottom chord and the top of the support column 1, respectively, using embedded components. The column top elevation and flatness were ensured during construction.

[0026] The above is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent scheme made using the contents of the present invention specification, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present invention.

Claims

1. A temporary support structure of a large-span annular laminated Vierendeel truss system, characterized in that: It includes several supporting columns on both sides and several connecting columns in the middle, the adjacent supporting columns, the adjacent connecting columns and the supporting columns and the connecting columns are connected by multiple connecting beams, the tops of the several supporting columns on the same side are connected by cantilevers, a sand box is set on the top of the supporting columns, and a large-span annular laminated hollow truss system is set at the upper end of the sand box.

2. The temporary support structure of the large-span annular laminated Vierendeel truss system according to claim 1, characterized in that: The plurality of support columns on the same side are in an arc-shaped state.

3. The temporary support structure of the large-span annular laminated Vierendeel truss system according to claim 1 or 2, characterized in that: The lifting plate is configured as an arc-shaped structure.

4. The temporary support structure of the large-span annular laminated Vierendeel truss system according to claim 1 or 2, characterized in that: There are eight support columns, which are symmetrically distributed on both sides; there are four connection columns, which are symmetrically distributed in the middle of the support columns on both sides.

5. The temporary support structure of the large-span annular laminated Vierendeel truss system according to claim 1 or 2, characterized in that: The connecting beams are provided with nine layers.

6. The temporary support structure of the large-span annular laminated Vierendeel truss system according to claim 1 or 2, characterized in that: The support columns, connecting columns and connecting beams are all made of reinforced concrete and are mutually connected to form a lattice frame structure.

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