A construction joint for connecting a shotcrete hanging to an original structure

Abstract

The utility model discloses a kind of building joints of hanging shotcrete and original structure connecting place, belong to building engineering technical field, including horizontal load-bearing steel component, backing plate, concrete floor and hanging shotcrete layer, backing plate is fixedly connected with horizontal load-bearing steel component, concrete floor includes connecting section and is used to place on the placement section of backing plate, the top surface of backing plate is fixed with the first connecting piece for embedding in placement section, second connecting piece for embedding in hanging shotcrete layer is equipped in connecting section, third connecting piece for embedding in hanging shotcrete layer is fixed on horizontal load-bearing steel component, fourth connecting piece for embedding in hanging shotcrete layer is fixed on the bottom surface of backing plate, steel hanging net is equipped in hanging shotcrete layer. Hanging shotcrete layer, both satisfy building effect, and solve steel component corrosion prevention, fire prevention problem, backing plate, each connecting piece and steel hanging net, can satisfy each part collaborative stress, guarantee connection stability and durability.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and in particular to a building node at the connection between suspended shotcrete and the original structure. Background Technology

[0002] Steel-reinforced concrete composite structures, as a novel composite system, combine spatial steel grids with cast-in-place reinforced concrete slabs through a synergistic force-bearing mechanism. Their core feature lies in filling the lower chord units of the steel grid with the concrete slab, forming an integrated load-bearing system of the grid and the concrete slab. This structure significantly improves the overall structural stability, compressive bearing capacity, and user comfort of the steel roof (or floor) through the complementary effect of the high-strength steel grid framework and the stiffness of the concrete slab. It is particularly suitable for large-span, heavy-load public buildings.

[0003] However, current technology still has key shortcomings that urgently need to be addressed: gaps or intervals exist between concrete floor slabs, easily exposing internal steel components, especially at the connection between the concrete floor slabs and steel beams (steel trusses). Long-term exposure of these steel components to high humidity or corrosive media exacerbates the risk of steel corrosion, directly impacting structural durability and lifespan. Current solutions primarily involve using post-sprayed concrete to form a suspended concrete layer to cover these gaps or intervals. However, the lack of effective interface anchoring measures between the suspended concrete layer and the original structure (steel components and / or concrete floor slabs) results in insufficient connection strength and durability, failing to meet the building's life-cycle protection requirements. Therefore, there is an urgent need to develop a new connection construction technology that combines corrosion resistance, interfacial synergistic stress characteristics, and long-term stability to overcome the application bottlenecks of existing steel-concrete composite structures. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems and provide a building node at the connection between suspended shotcrete and the original structure. A suspended shotcrete layer is set below the concrete floor slab and the horizontal load-bearing steel components. This can not only meet the interior architectural effect, but also solve the problems of corrosion and fire prevention of steel components. The support plate, the first connector, the second connector, the third connector, the fourth connector, and the steel mesh can connect the horizontal load-bearing steel components, the concrete floor slab, and the suspended shotcrete layer to share the load, meet the interface collaborative load-bearing requirements of the building node, and ensure the connection stability and durability of the building node.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model discloses a building node at the connection between suspended shotcrete and the original structure, including a horizontal load-bearing steel component, a support plate, a concrete floor slab, and a suspended shotcrete layer. The horizontal load-bearing steel component, the support plate, and the concrete floor slab are all located above the suspended shotcrete layer. The support plate is fixedly connected to the side of the horizontal load-bearing steel component. The concrete floor slab includes a placement section and a connecting section for connecting with the suspended shotcrete layer. The placement section is placed on the support plate. A first connector for embedding in the placement section is fixedly connected to the top surface of the support plate. A second connector for embedding in the suspended shotcrete layer is provided in the connecting section. A third connector for embedding in the suspended shotcrete layer is fixedly connected to the horizontal load-bearing steel component. A fourth connector for embedding in the suspended shotcrete layer is fixedly connected to the bottom surface of the support plate. A steel mesh is embedded in the suspended shotcrete layer. The second, third, and fourth connectors are all fixedly connected to the steel mesh.

[0006] In one embodiment, the second connector, the third connector, and the fourth connector are all provided with an enlarged portion at one end embedded in the suspended shotcrete layer, and the first connector is provided with an enlarged portion at one end embedded in the concrete floor slab.

[0007] In one embodiment, the first connector, the third connector, and the fourth connector are all studs, the second connector is a shot nail, and the head of the stud and the head of the shot nail are the enlarged portion.

[0008] In one embodiment, the pallet is a steel pallet.

[0009] In one embodiment, a reinforcing rib is fixedly connected between the pallet and the horizontal load-bearing steel member.

[0010] In one embodiment, the fixed connection is fixed by welding.

[0011] In one embodiment, the concrete floor slab is a reinforced concrete floor slab, a steel truss formwork-free floor slab, or a steel truss formwork-removable floor slab.

[0012] In one embodiment, when the concrete floor slab is a steel truss formwork-free floor slab, the steel truss formwork-free floor slab has a concrete bottom formwork that does not need to be removed; when the concrete floor slab is a steel truss formwork-removable floor slab, the steel truss formwork-removable floor slab has a detachable steel bottom formwork.

[0013] In one embodiment, the horizontal load-bearing steel component is a steel beam or a steel truss.

[0014] In one embodiment, the steel mesh is a steel bar mesh or a steel wire mesh.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] In the architectural joint where the suspended shotcrete connects to the original structure, this utility model provides a suspended shotcrete layer below the concrete floor slab and horizontal load-bearing steel components. This satisfies both the interior architectural effect and solves problems related to corrosion and fire prevention of the steel components. Under the connection of the support plate, the first connector, the second connector, the third connector, the fourth connector, and the steel mesh, the horizontal load-bearing steel components, the concrete floor slab, and the suspended shotcrete layer can share the load, meeting the interface coordination requirements of the architectural joint and ensuring the connection stability and durability of the architectural joint. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained by analyzing these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of the building node (including steel beams and steel truss formwork-free floor deck) at the connection between the suspended shotcrete and the original structure in this embodiment of the utility model.

[0019] Figure 2 This is a structural schematic diagram of the building node (including steel truss and steel reinforcement truss formwork-free floor deck) at the connection between the suspended shotcrete and the original structure in this embodiment of the utility model.

[0020] Figure 3 This is a schematic diagram of the building node (including steel beams and steel truss detachable formwork floor slab) at the connection between the suspended shotcrete and the original structure in an embodiment of this utility model.

[0021] Figure 4 This is a schematic diagram of the building node (including steel truss and rebar truss detachable formwork floor slab) at the connection between the suspended shotcrete and the original structure in an embodiment of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Support plate; 2. Suspended shotcrete layer; 3. Steel truss formwork-free floor deck; 4. Steel truss removable formwork floor deck; 5. Steel beam; 6. Steel truss; 7. First connector; 8. Second connector; 9. Third connector; 10. Fourth connector; 11. Steel mesh; 12. Concrete bottom formwork-free; 13. Location of the original removable steel bottom formwork. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments analyzed and obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] The purpose of this utility model is to provide a building node at the connection between suspended shotcrete and the original structure to solve the problems existing in the prior art. By setting a suspended shotcrete layer below the concrete floor slab and the horizontal load-bearing steel components, it can not only meet the interior architectural effect, but also solve the problems of corrosion prevention and fire prevention of steel components. Under the connection of the support plate, the first connector, the second connector, the third connector, the fourth connector and the steel mesh, the horizontal load-bearing steel components, the concrete floor slab and the suspended shotcrete layer can share the force, meet the interface coordination force requirements of the building node, and ensure the connection stability and durability of the building node.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 4As shown, this embodiment provides a building node at the connection between suspended shotcrete and the original structure, including a horizontal load-bearing steel component, a support plate 1, a concrete floor slab, and a suspended shotcrete layer 2. The horizontal load-bearing steel component is a horizontally arranged steel component, such as a steel beam 5 or a steel truss 6, used for load-bearing. The horizontal load-bearing steel component, support plate 1, and concrete floor slab are all located above the suspended shotcrete layer 2. The support plate 1 is fixedly connected to the side of the horizontal load-bearing steel component. The concrete floor slab includes a placement section and a connecting section. The placement section is placed on the support plate 1, and the connecting section is used to connect to the suspended shotcrete layer 2. During the subsequent spraying of the suspended shotcrete layer 2, the concrete mortar of the suspended shotcrete layer 2 will bond with the connecting section. A first connector 7 is fixedly connected to the support plate 1, and the first connector 7 is embedded in the placement section to achieve the connection between the concrete floor slab and the horizontal load-bearing steel component. A second connector 8 is provided within the connecting section. When the shotcrete layer 2 is sprayed, the second connector 8 is embedded within the shotcrete layer 2, achieving a connection between the concrete floor slab and the shotcrete layer 2, allowing them to share the load. A third connector 9 is fixedly connected to the horizontal load-bearing steel component. When the shotcrete layer 2 is sprayed, the third connector 9 is embedded within the shotcrete layer 2, achieving a connection between the shotcrete layer 2 and the horizontal load-bearing steel component. A fourth connector 10 is fixedly connected to the support plate 1. When the shotcrete layer 2 is sprayed, the fourth connector 10 is embedded within the shotcrete layer 2, achieving a connection between the shotcrete layer 2 and the support plate 1, allowing them to share the load. A steel mesh 11 is embedded within the shotcrete layer 2. The second connector 8, the third connector 9, and the fourth connector 10 are all fixedly connected to the steel mesh 11, strengthening the connection between the second connector 8, the third connector 9, and the fourth connector 10 and the shotcrete layer 2.

[0027] Construction process:

[0028] First, the pallet 1 is fixedly connected to the side of the horizontal load-bearing steel member (it may be on both sides or one side). The upper surface of the pallet 1 is fixedly connected to the first connector 7. The first connector 7 can be prefabricated with the pallet 1 in the factory or fixedly connected to the upper surface of the pallet 1 on site. The lower part of the horizontal load-bearing steel member is fixedly connected to the third connector 9. The third connector 9 can be prefabricated with the horizontal load-bearing steel member in the factory or fixedly connected to the horizontal load-bearing steel member on site. The lower surface of the pallet 1 is fixedly connected to the fourth connector 10. The fourth connector 10 can be fixedly connected to the lower surface of the pallet 1 in the factory or fixedly connected to the lower surface of the pallet 1 on site.

[0029] Then, the concrete floor slab is poured. Part of the concrete floor slab is poured on the support plate 1, and the first connector 7 is pre-embedded in it to form a placement section. The remaining part of the concrete floor slab is the connection section. After the concrete floor slab is poured, the second connector 8 is implanted into the connection section on site.

[0030] Finally, the steel mesh 11 is fixedly connected to the second connector 8, the third connector 9, and the fourth connector 10, and the sprayed concrete layer 2 can be sprayed to complete the construction of this building node.

[0031] The surface roughness of the suspended shotcrete layer 2 can be determined according to the architectural effect and construction process. By applying a second layer of shotcrete under the concrete floor slab (suspended shotcrete layer 2), both the interior architectural effect and the corrosion and fire prevention of steel components can be achieved. The support plate 1, the first connector 7, the second connector 8, the third connector 9, the fourth connector 10, and the steel mesh 11 combine the horizontal load-bearing steel components, the concrete floor slab, and the suspended shotcrete layer 2 to share the load, thereby improving the connection stability and durability of the architectural node.

[0032] In one embodiment, the first connector 7 has an enlarged portion at one end embedded in the floor slab. The diameter of the enlarged portion of the first connector 7 is larger than the diameter of the main body of the first connector 7, which improves the tensile strength of the first connector 7 and thus enhances the connection strength between the first connector 7 and the concrete floor slab. Similarly, the second connector 8 has an enlarged portion at one end embedded in the suspended shotcrete layer 2. The diameter of the enlarged portion of the second connector 8 is larger than the diameter of the main body of the second connector 8, which improves the tensile strength of the second connector 8 and thus enhances the connection strength between the second connector 8 and the suspended shotcrete layer 2. Likewise, the third connector 9 has an enlarged portion at one end embedded in the suspended shotcrete layer 2. The diameter of the enlarged portion of the third connector 9 is larger than the diameter of the main body of the third connector 9, which improves the tensile strength of the third connector 9 and thus enhances the connection strength between the third connector 9 and the suspended shotcrete layer 2. The fourth connector 10 has an enlarged portion at one end embedded in the suspended shotcrete layer 2. The diameter of the enlarged portion of the fourth connector 10 is larger than the diameter of the main body of the fourth connector 10 to improve the pull-out resistance of the fourth connector 10 and thus improve the connection strength between the fourth connector 10 and the suspended shotcrete layer 2. The first connector 7, the second connector 8, the third connector 9, and the main body of the fourth connector 10 can be rod-shaped structures or other shapes.

[0033] In one embodiment, the first connector 7, the third connector 9, and the fourth connector 10 are all studs. The second connector 8 is a nail. The heads of both the studs and the nails are enlarged portions. After the concrete floor slab is poured, the nail (second connector 8) is driven into the concrete floor slab.

[0034] In one embodiment, the pallet 1 is a steel pallet. Of course, other metal plates with high rigidity can also be used, but steel pallets are preferred because they are inexpensive and readily available.

[0035] In one embodiment, a reinforcing rib is fixedly connected between the support plate 1 and the horizontal load-bearing steel member to enhance the connection strength between the support plate 1 and the horizontal load-bearing steel member. The reinforcing rib is made of the same material as the support plate 1.

[0036] In one embodiment, all the fixed connections mentioned throughout the text can be fixed by welding. Specifically, the third connector 9 (stud) is arranged at a preset interval on the horizontal load-bearing steel member, and can be welded to the horizontal load-bearing steel member on site or in the factory. Second connectors 8 (pitch nails) are arranged at regular intervals on the connection section of the concrete floor slab, and the steel mesh 11 is connected to the second connectors 8 (pitch nails), the third connector 9 (stud), and the fourth connector 10 (stud) by spot welding.

[0037] In one embodiment, the concrete floor slab is a reinforced concrete floor slab, a steel truss formwork-free floor slab 3, or a steel truss formwork-removable floor slab 4.

[0038] In one embodiment, when the concrete floor slab is a steel truss formwork-free floor deck 3, the bottom formwork of the steel truss formwork-free floor deck 3 is a concrete bottom formwork 12 that does not need to be removed. After the steel truss formwork-free floor deck 3 is poured, the concrete bottom formwork 12 does not need to be removed. Using the concrete bottom formwork 12 ensures the bond strength between the steel truss formwork-free floor deck 3 and the secondary shotcrete (suspended shotcrete layer 2). When the concrete floor slab is a steel truss removable formwork floor deck 4, the bottom formwork of the steel truss removable formwork floor deck 4 is a detachable steel bottom formwork. After the steel truss removable formwork floor deck 4 is poured, the detachable steel bottom formwork needs to be removed before the suspended shotcrete layer 2 is sprayed to ensure the bond strength between the steel truss removable formwork floor deck 4 and the secondary shotcrete (suspended shotcrete layer 2). Figure 3 The location 13 shown is the original location of the detachable steel bottom mold, which is the position before the detachable steel bottom mold was removed.

[0039] In one embodiment, the horizontal load-bearing steel member is a steel beam 5 or a steel truss 6. When the horizontal load-bearing steel member is a steel beam 5, the steel beam 5 can be made of square steel, I-beams, or other steel components. When the horizontal load-bearing steel member is a steel truss 6, the concrete floor slab corresponds in height to the lower chord of the steel truss 6.

[0040] In one embodiment, the steel mesh 11 is a steel bar mesh or a steel wire mesh.

[0041] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A building joint at the connection between suspended shotcrete and the original structure, characterized in that, The system includes a horizontal load-bearing steel component, a support plate, a concrete floor slab, and a suspended shotcrete layer. The horizontal load-bearing steel component, the support plate, and the concrete floor slab are all located above the suspended shotcrete layer. The support plate is fixedly connected to the side of the horizontal load-bearing steel component. The concrete floor slab includes a placement section and a connecting section for connecting to the suspended shotcrete layer. The placement section is placed on the support plate. A first connector for embedding in the placement section is fixedly connected to the top surface of the support plate. A second connector for embedding in the suspended shotcrete layer is provided in the connecting section. A third connector for embedding in the suspended shotcrete layer is fixedly connected to the horizontal load-bearing steel component. A fourth connector for embedding in the suspended shotcrete layer is fixedly connected to the bottom surface of the support plate. A steel mesh is embedded in the suspended shotcrete layer. The second, third, and fourth connectors are all fixedly connected to the steel mesh.

2. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 1, characterized in that, The second connector, the third connector, and the fourth connector are all provided with an enlarged portion at one end embedded in the suspended shotcrete layer, and the first connector is provided with an enlarged portion at one end embedded in the concrete floor slab.

3. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 2, characterized in that, The first connector, the third connector, and the fourth connector are all studs, the second connector is a nail, and the head of the stud and the head of the nail are the enlarged portion.

4. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 3, characterized in that, The pallet is a steel pallet.

5. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 4, characterized in that, The support plate is fixedly connected to the horizontal load-bearing steel component by reinforcing ribs.

6. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 4 or 5, characterized in that, The fixed connection is fixed by welding.

7. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 1, characterized in that, The concrete floor slab is a reinforced concrete floor slab, a steel truss formwork-free floor slab, or a steel truss formwork-removable floor slab.

8. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 7, characterized in that, When the concrete floor slab is a steel truss formwork-free floor slab, the steel truss formwork-free floor slab has a concrete bottom formwork that does not need to be removed; when the concrete floor slab is a steel truss formwork-removable floor slab, the steel truss formwork-removable floor slab has a detachable steel bottom formwork.

9. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 1, characterized in that, The horizontal load-bearing steel components are steel beams or steel trusses.

10. The architectural joint at the connection between the suspended shotcrete and the original structure according to claim 1, characterized in that, The steel mesh is either a steel bar mesh or a steel wire mesh.

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