Sandwich composite steel bar truss superposed folding shell structure

Abstract

The utility model relates to an interlayer composite steel bar truss overlapping folding shell structure, which comprises a GFRP bottom plate, a fastener, a steel bar truss, an XPS plate and a post-cast concrete layer, the GFRP bottom plate is an arc-shaped folding plate, a bending angle and a bending plane are formed on the arc-shaped folding plate, the XPS plate is fixedly adhered to the bending angle and the end part of the upper surface of the GFRP bottom plate, and the post-cast concrete layer is arranged on the GFRP bottom plate. The fasteners are arranged on the GFRP bottom plate, the steel bar trusses are fixedly connected to the fasteners and located between every two adjacent XPS plates, and the post-pouring concrete layer is poured on the GFRP bottom plate, the steel bar trusses and the XPS plates which are connected with one another on site during construction, so that the stress performance and the structural span of the structure can be remarkably improved, construction is convenient, and the construction efficiency is improved. And the construction and maintenance cost can be greatly saved, and a positive effect is achieved on popularization and development of thin-shell structures and fabricated buildings.

Description

Technical Field

[0001] The utility model relates to the field of building structures, in particular to a sandwich composite steel bar truss superposed folded shell structure, which can be specifically used in large-span space structures such as large shopping malls, airports, railway stations, highway toll stations, etc. Background Technique

[0002] Thin shell structures are widely used in the field of structural engineering due to their beautiful appearance, strange shapes, excellent mechanical properties, etc., especially in many landmark buildings.

[0003] Limited by the material properties of traditional concrete and steel structures, the existing thin shell structures have the following problems: First, for concrete thin shell structures, a large amount of formwork support and on-site construction operations are required during the pouring process. In addition, the self-weight of the concrete structure is relatively large. For general industrial buildings, the self-weight of the concrete structure often accounts for 50% - 70% of the total vertical load, increasing the construction cost and construction difficulty. Second, for steel thin shell structures, although the self-weight of the structure can be greatly reduced, since steel structures are easily corroded by the natural environment, and in order to ensure the reliability of the structure, a huge cost is required every year for the monitoring and maintenance of corroded components, increasing the maintenance cost. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the disadvantages of high construction and maintenance costs of existing thin shell structures, and provide a sandwich composite steel bar truss superposed folded shell structure, which has the advantages of excellent mechanical properties, convenient construction, and can reduce construction and maintenance costs.

[0005] The utility model adopts the following technical scheme: A sandwich composite steel bar truss superposed folded shell structure, including a GFRP bottom plate, fasteners, steel bar trusses, XPS boards and a cast-in-place concrete layer. The GFRP bottom plate is set as an arc-shaped folded plate, and a bending angle and a bending plane are formed on the arc-shaped folded plate. The XPS boards are fixedly bonded to the bending angle and the end of the upper surface of the GFRP bottom plate. The fasteners are arranged on the GFRP bottom plate, and the steel bar trusses are fixedly connected to the fasteners and are located between two adjacent XPS boards. The cast-in-place concrete layer is cast on the connected GFRP bottom plate, steel bar trusses and XPS boards during construction.

[0006] Further, the GFRP bottom plate is composed of a plurality of GFRP plates with planar shapes spliced together.

[0007] Further, the steel bar truss is formed by welding steel bars with different diameters, and includes one upper chord bar steel bar, two lower chord bar steel bars, and several web bar steel bars connected between the upper chord bar steel bar and the lower chord bar steel bars. The diameters of the upper chord bar steel bar and the lower chord bar steel bars are larger than the diameters of the web bar steel bars.

[0008] Furthermore, the bottom of the steel bar truss is welded to the fastener.

[0009] Furthermore, the fastener includes a stainless steel backing plate, stainless steel bolts, stainless steel nuts, and stainless steel washers. The stainless steel bolts, stainless steel nuts, and stainless steel washers are used for the firm connection between the stainless steel backing plate and the GFRP bottom plate; the steel bar truss is welded to the stainless steel backing plate to form a stable precast slab skeleton.

[0010] Furthermore, the XPS board includes a first XPS board and a second XPS board. The first XPS board is set to have a V-shaped cross-section adapted to the bending angle, and the second XPS board is set to be a flat plate for the bonding part where the end of the GFRP board is connected to the reinforced concrete beam.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] The sandwich composite steel bar truss laminated folded shell structure of this utility model uses high-performance composite material GFRP boards and steel bar trusses to be connected to form precast components, which can improve the mechanical properties of the structure. The lightweight thermal insulation XPS board is used as the filling structure between the precast components and the concrete slab. On the premise of meeting the structural stiffness, it can also greatly reduce the self-weight of the structure, increase the span of the structure. The shell with an arc-shaped folded plate is approximately in the shape of a curved shell, obtaining a similar aesthetic shape but greatly reducing the construction difficulty; in addition, the combination structure of GFRP boards, steel bar trusses, and XPS boards adopts the assembled laminated slab, with the advantages of prefabricated buildings, making the entire construction process simple, convenient, and efficient.

[0013] To sum up, the sandwich composite steel bar truss laminated folded shell structure of this utility model has greatly improved in terms of material properties, structural form, and construction technology. It can significantly improve the mechanical properties and structural span of the structure, is convenient for construction, and can greatly save construction and maintenance costs, playing a positive role in the popularization and development of thin-shell structures and prefabricated buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an isometric schematic view of the sandwich composite steel bar truss laminated folded shell structure.

[0015] Figure 2 It is a front view schematic view of the sandwich composite steel bar truss laminated folded shell structure.

[0016] Figure 3 It is a partial enlarged schematic view of the folded shell structure.

[0017] Figure 4 It is an isometric schematic view of the sandwich composite steel bar truss laminated folded shell structure (omitting the post-cast concrete layer).

[0018] Figure 5It is an axonometric schematic diagram of a steel bar truss and a stainless steel fastener.

[0019] Figure 6 It is a schematic diagram of the connection structure of a GFRP board, a fastener and a steel bar truss.

[0020] In the figure: 1 - Sandwich composite steel bar truss laminated folded shell structure; 2 - Reinforced concrete beam; 3 - GFRP bottom plate; 4 - XPS board; 5 - Fastener; 51 - Stainless steel bolt; 52 - Stainless steel backing plate; 6 - Steel bar truss; 61 - Lower chord bar steel bar; 62 - Upper chord bar steel bar; 63 - Web bar steel bar; 7 - Cast-in-place concrete layer. Specific implementation manners

[0021] Next, the technical solutions in the embodiments of the present utility model will be described with reference to the accompanying drawings in the embodiments of the present utility model.

[0022] As Figure 1 shown, a sandwich composite steel bar truss laminated folded shell structure 1, both ends of the entire laminated folded shell structure can be placed on the reinforced concrete beam 2 for support, and the laminated folded shell structure 1 includes a GFRP bottom plate 3, an XPS board 4, a steel bar truss 6 and a cast-in-place concrete layer 7, wherein the GFRP bottom plate 3 and the steel bar truss 6 are connected by a fastener 5, and the partial enlargement is as Figure 3 shown. Specifically, the GFRP bottom plate is made of GFRP composite material, which has the advantages of high temperature resistance, corrosion resistance, fatigue resistance, light weight and high strength, and its tensile strength is also relatively high. As the bottom plate of the folded shell structure, on the one hand, it can improve the mechanical properties of the structure, and on the other hand, it can be used as a formwork. Compared with the concrete bottom plate, the demoulding link is reduced in the precast slab production in the factory, which can save construction procedures, construction costs and maintenance costs.

[0023] CFRP composite material has the advantages of high temperature resistance, corrosion resistance, fatigue resistance, light weight and high strength, and has been gradually applied in the field of building structures. Due to its relatively high tensile strength, applying it to the bottom plate of the plate structure can not only greatly optimize and improve the mechanical properties of the structure, but also significantly improve the durability of the structure. The GFRP bottom plate 1 is an arc-shaped folded plate and can be composed of splicing of multiple GFRP plates with planar shapes.

[0024] Specifically, a high-performance GFRP board is used as the bottom board, and a single GFRP board and a single steel bar truss are connected by fasteners 5 to form a prefabricated component, which can be assembled and processed in batches in the factory. During factory assembly, 2, 3 or more prefabricated components can also be pre-assembled into a partially folded-line combined prefabricated component. Specifically, the GFRP boards of adjacent prefabricated components are bonded, and an XPS board is pasted on the GFRP board with epoxy resin glue at the gap between the connected steel bar trusses. After the combined prefabricated component is transported to the construction site, an XPS board is pasted on the GFRP board with epoxy resin glue at the gap between the steel bar trusses of adjacent prefabricated combined boards that are pre-spliced, and finally assembled into a folded-line shape. The folded shell structure of the present utility model constructs the traditional curved thin shell structure into a folded-line thin shell structure, obtaining a similar aesthetic shape but greatly reducing the construction difficulty, and can significantly increase the span of the structure. After the assembly of the folded shell structure is completed, the cast-in-place concrete can be poured. Since the prefabricated component is used as the formwork for concrete pouring, there is no need to remove the formwork until it is cured to the design strength, and finally the sandwich composite steel bar truss composite folded shell structure of the present utility model is formed.

[0025] More specifically, as Figure 5 shown, the steel bar truss 6 includes a lower chord bar steel 61, an upper chord bar steel 62 and a web bar steel 63. The construction of the steel bar truss connects the lower chord bar steel 61, the upper chord bar steel 62 and the web bar steel 6 through welding, and this work can be completed in the factory in advance. Among them, the lower chord bar steel 61 can well resist the bending moment of the component as the tensile steel bar of the structure, the upper chord bar steel 62 can be used as the compressive steel bar of the structure to work together with the concrete in the compression zone, and the web bar steel 63 can be used to resist the shear force in the bending-shear section. Compared with the traditional steel bar skeleton tied on the construction site, the form of the steel bar truss can improve the overall stability of the steel bars and reduce the tying work on the construction site, and can significantly improve the production efficiency.

[0026] Furthermore, as Figure 6 shown, the fastener 5 includes a stainless steel backing plate 52, a stainless steel bolt 51, a stainless steel nut and a stainless steel gasket. The GFRP board is connected to the stainless steel backing plate 52 through the stainless steel bolt 51, the stainless steel nut and the stainless steel gasket. Specifically, holes are first drilled on the GFRP board and the stainless steel backing plate 52 according to the size of the selected bolt, and then the stainless steel bolt 51 is passed through the GFRP board and the stainless steel backing plate 52 and tightened firmly, so as to realize the stable connection between the stainless steel backing plate 52 and the GFRP board. The remaining stainless steel backing plates 52 are all connected to the GFRP board in this way. By using the stainless steel bolt 51 and the stainless steel backing plate 52, the problem of steel member corrosion can be avoided, thereby improving the durability of the entire structure.

[0027] After the stainless steel backing plate 52 forms a firm connection with the GFRP plate, place the steel bar truss 6 on the stainless steel backing plate 52 that has been connected to the GFRP plate, and use an electric welding machine to weld the steel bar truss 6 to the stainless steel backing plate 52, so that the steel bar truss 6, the stainless steel backing plate 52 and the GFRP plate form a stable prefabricated component. Due to the application of high-performance composite materials and steel bar trusses, the mechanical properties of the structure can be improved. In particular, the tensile strength of the GFRP plate is much higher than that of steel bars. In terms of material properties, the structural strength can be improved. At the same time, the GFRP plate is located at the bottom layer of the structure. When resisting bending moment, the moment arm of its flexural bearing capacity also increases, thereby further improving the structural strength.

[0028] After a single prefabricated component is formed, assemble every two or three or more prefabricated components into a partially folded-line combined prefabricated component. Specifically, paste XPS boards on the GFRP plates 3 on both sides of the steel bar truss 6, which are used as the filling structural layer between the prefabricated component and the cast-in-place concrete layer. See Figure 4 . The XPS board has high heat preservation, stability, compressive strength and good corrosion resistance. At the same time, compared with other similar foam boards, it will not volatilize harmful substances. It is a widely used green energy-saving material at present. When it is used as the filling layer of the folded shell structure, compared with the traditional concrete thin shell structure, it can greatly reduce the self-weight of the shell structure on the premise of ensuring the structural stiffness, thereby increasing the span of the shell. As Figure 3 shown, the XPS board has two structures, namely the first XPS board and the second XPS board. The first XPS board is set to have a V-shaped cross-section that is adapted to the bending angle, and the second XPS board is set to be a flat plate, which is used for the bonding part where the end of the GFRP plate is connected to the reinforced concrete beam 2.

[0029] Transport the above-mentioned combined prefabricated components to the construction site for hoisting and assembling work. Compared with the traditional reinforced concrete precast slab, the self-weight of the folded shell structure of the present invention is greatly reduced, and the difficulty of its hoisting and transportation work is also greatly reduced. As Figure 2 shown, during assembly, instead of the traditional curve type in the thin shell structure, it becomes a folded-line shell structure. After the assembly work of the folded shell structure is completed, the cast-in-place concrete layer can be directly poured on the prefabricated component. After the pouring is completed, maintenance is carried out to meet the design requirements, and finally it becomes the new sandwich composite steel bar truss laminated folded shell structure in the present invention. The prefabricated component serves both as the formwork for pouring the concrete layer and as a part of the load-bearing structure. Therefore, the formwork removal work is not involved in the entire construction process, making the on-site construction process relatively simple and convenient, changing the problems in the traditional shell structure such as complex construction, many molds, difficult formwork removal, and high maintenance costs, giving full play to the advantages of prefabricated buildings and also being able to greatly promote the development of thin shell structures.

[0030] An assembled composite slab formed by laminating prefabricated components and cast-in-situ concrete has advantages such as standardization, industrialization, and assembly, which greatly improve production efficiency and save mold costs. In addition, in the assembled composite slab, an XPS board with a relatively light self-weight can be used as an interlayer and filled between the CFRP board and the concrete board, meeting the stiffness requirements of the composite slab while reducing the structural self-weight. Moreover, for the steel bar truss of the composite slab, a welded connection form can be adopted, thus significantly reducing the workload of on-site steel bar binding.

[0031] The above-described embodiments of the present invention do not constitute a limitation on the protection scope of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A sandwich composite steel bar truss superposed folded shell structure, characterized in that, It includes a GFRP bottom plate, fasteners, a steel bar truss, an XPS board and a cast-in-place concrete layer. The GFRP bottom plate is arranged as an arc-shaped folded plate, and a bending angle and a bending plane are formed on the arc-shaped folded plate. The XPS board is fixedly bonded to the bending angle and the end of the upper surface of the GFRP bottom plate. The fasteners are arranged on the GFRP bottom plate, and the steel bar truss is fixedly connected to the fasteners and is located between two adjacent XPS boards. The cast-in-place concrete layer is cast on the connected GFRP bottom plate, steel bar truss and XPS board during construction.

2. The sandwich composite steel bar truss laminated folded shell structure according to claim 1, characterized in that, The GFRP bottom plate is composed of multiple GFRP plates with a planar shape spliced together.

3. The sandwich composite steel bar truss superposed folded shell structure according to claim 1, wherein, The steel bar truss is formed by welding steel bars with different diameters, and includes a top chord steel bar, two bottom chord steel bars, and several web member steel bars connected between the top chord and the bottom chord. The diameters of the top chord steel bar and the bottom chord steel bars are larger than the diameter of the web member steel bars.

4. The sandwich composite steel bar truss superposed folded shell structure according to claim 1, characterized in that , The bottom of the steel bar truss is welded to the fasteners.

5. The sandwich composite steel truss superposed folded shell structure according to claim 1, wherein The fasteners include a stainless steel backing plate, stainless steel bolts, stainless steel nuts and stainless steel washers. The stainless steel bolts, stainless steel nuts and stainless steel washers are used for the firm connection between the stainless steel backing plate and the GFRP bottom plate; The steel bar truss is welded to the stainless steel backing plate.

6. The sandwich composite steel bar truss superposed folded shell structure according to claim 1, characterized in that The XPS board includes a first XPS board and a second XPS board. The first XPS board is arranged with a V-shaped cross section adapted to the bending angle, and the second XPS board is arranged as a flat plate for the bonding part where the end of the GFRP board is connected to the reinforced concrete beam.

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