A floor structure

Abstract

This utility model belongs to the field of floor slab reinforcement technology, and in particular to a floor slab structure, including a precast floor slab. Load-bearing walls are provided on both sides of the precast floor slab. An upper reinforcement component is provided above the precast floor slab. The upper reinforcement component includes a formwork and a post-cast concrete layer. The post-cast concrete layer is poured inside the formwork, and a bidirectional steel mesh is provided inside the post-cast concrete layer. Carbon fiber cloth is provided below the precast floor slab. Several transversely evenly distributed main beams are provided below the carbon fiber cloth, and several vertically evenly distributed secondary beams are provided below the transverse main beams. The upper layer combines the post-cast concrete layer and the bidirectional steel mesh to connect the dispersed precast slabs into a whole. The middle layer reinforces the tension zone with carbon fiber cloth, improving the bending load-bearing capacity and ductility of the precast floor slab. The lower layer, with its transverse main beams and longitudinal secondary beams, forms a supporting frame, achieving the effect of improving seismic reinforcement.

Description

Technical Field

[0001] This utility model belongs to the field of floor slab reinforcement technology, specifically relating to a floor slab structure. Background Technology

[0002] In the field of building construction, precast concrete floor slabs are widely used in some industrial buildings due to their advantages such as factory production of components, convenient on-site installation, short construction cycle and controllable cost, especially suitable for the efficiency requirements of large-scale construction scenarios.

[0003] However, precast slab flooring has significant shortcomings in seismic performance. Precast slabs are mostly spliced ​​using dry joints or simple wet joints. Dry joints are only connected by the tongue and groove joints at the slab ends and mortar filling, while wet joints only have a small amount of structural reinforcement in the joints, failing to form a continuous load-bearing system. This makes it easy for slab joints to crack, mortar to fall off, and even relative displacement between adjacent precast slabs under horizontal seismic action. In severe cases, this can lead to slab collapse. At the same time, precast slabs lack rigid anchoring measures to load-bearing walls, so horizontal forces cannot be effectively transferred to the main lateral force resisting components during earthquakes. This can easily cause the floor slab to detach from the supports and the floor slab to collapse locally, thus disrupting the load-bearing path and resulting in low overall seismic performance. Utility Model Content

[0004] To address the above problems, the purpose of this utility model is to provide a floor slab structure that solves the problem of poor seismic performance of precast slabs.

[0005] To achieve the above objectives, a floor slab structure includes a precast floor slab with load-bearing walls on both sides. An upper reinforcement assembly is provided above the precast floor slab, comprising a formwork and a post-cast concrete layer. The post-cast concrete layer is poured inside the formwork and contains a bidirectional steel mesh. Carbon fiber cloth is placed below the precast floor slab, and several transversely evenly distributed main beams are placed below the carbon fiber cloth. Several vertically evenly distributed secondary beams are placed below the main beams. The transverse main beams are connected to the load-bearing walls via end plates.

[0006] Preferably, the bidirectional steel mesh is located at the bottom of the post-cast concrete layer, and the bidirectional steel mesh is at a certain distance from the top surface of the load-bearing wall.

[0007] Preferably, the bottom of the precast floor slab is formed into an adhesive surface by grinding, and the carbon fiber cloth is bonded to the adhesive surface of the bottom of the precast floor slab with epoxy resin adhesive.

[0008] Preferably, a plurality of hangers are installed inside the longitudinal secondary beam, and the top of the hangers is installed inside the precast floor slab with structural adhesive.

[0009] Preferably, an anchor rod is screwed to the inner side of the end plate, and one side of the anchor rod is installed inside the load-bearing wall.

[0010] Preferably, the load-bearing wall has a preset hole on the side facing the end plate, and the diameter of the preset hole is larger than the diameter of the anchor rod.

[0011] The utility model has the following beneficial effects: The seismic strengthening effect is achieved through a three-layer synergy: the upper layer combines a post-cast concrete layer with a two-way steel mesh to connect the scattered precast slabs into a whole, solving the problem of splicing the precast floor slabs and improving the overall integrity and lateral stiffness of the floor slab; the middle layer reinforces the tension zone with carbon fiber cloth to improve the bending capacity and ductility of the precast floor slab, restrain crack development, and avoid brittle fracture; the lower layer forms a supporting frame with transverse main beams and longitudinal secondary beams, which are rigidly anchored to the end plates and load-bearing walls to safely and reliably transfer the load of the precast floor slab to the lateral force resisting members, optimize the force transmission path, and achieve the effect of improving seismic strengthening. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a structural schematic diagram of the upper reinforcement component, carbon fiber cloth, and transverse main beam in this utility model.

[0013] In the diagram: 1. Precast floor slab; 11. Load-bearing wall; 12. Pre-set hole; 2. Upper reinforcement component; 21. Formwork; 22. Post-cast concrete layer; 23. Two-way steel mesh; 3. Carbon fiber cloth; 4. Transverse main beam; 41. Longitudinal secondary beam; 411. Hanger; 42. End plate; 43. Anchor bolt. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0015] Example: like Figure 1—3 shows a floor slab structure, including a precast floor slab 1, load-bearing walls 11 on both sides of the precast floor slab 1, an upper reinforcement component 2 above the precast floor slab 1, the upper reinforcement component 2 including a formwork 21 and a post-cast concrete layer 22, the post-cast concrete layer 22 being poured inside the formwork 21, a two-way steel mesh 23 being provided inside the post-cast concrete layer 22, a carbon fiber cloth 3 being provided below the precast floor slab 1, a number of transversely evenly distributed transverse main beams 4 being provided below the carbon fiber cloth 3, a number of vertically evenly distributed longitudinal secondary beams 41 being provided below the transverse main beams 4, and the number of transverse main beams 4 being connected to the load-bearing walls 11 through end plates 42.

[0016] The formwork 21 installed above the precast floor slab 1 assists workers in pouring the final concrete layer 22. Workers can first roughen the upper surface of the precast floor slab 1 and apply an interface agent, then place the bidirectional steel mesh 23 inside the upper reinforcement component 2. Next, the formwork 21 is placed above the precast floor slab 1, and the bidirectional steel mesh 23 is raised to a certain height using blocks to prevent direct contact with the precast floor slab 1. At this point, workers can pour concrete inside the upper reinforcement component 2. After the final concrete layer 22 is poured and solidified, workers can remove the formwork 21 and proceed with the final concrete pouring. The soil layer 22 connects the originally dispersed precast slabs into a continuous load-bearing system through the rough surface of the precast floor slab 1 and the bonding agent. Furthermore, the post-cast concrete layer 22 directly increases the effective thickness of the precast floor slab 1, thereby improving its lateral stiffness and reducing flexural deformation under seismic loads. This prevents excessive deformation from causing cracking or misalignment of the slab joints. The bidirectional steel mesh 23 located within the post-cast concrete layer 22 supplements the bending and shear resistance of the precast floor slab 1. The bidirectional steel mesh 23 is uniformly distributed along the long and short spans of the precast floor slab 1, directly bearing the positive and negative bending moments under seismic loads, while simultaneously enhancing the post-cast concrete layer's strength. The shear resistance of the concrete layer 22 is improved to prevent interlayer shear failure, thereby reinforcing the upper layer of the precast floor slab 1 and forming a whole from several precast floor slabs 1. The carbon fiber cloth 3 set at the bottom of the precast floor slab 1 is used to reinforce the tensile bearing capacity of the precast floor slab 1. The carbon fiber cloth 3 is bonded to the tensile zone at the bottom of the precast floor slab 1, which can make up for the insufficient reinforcement of the precast floor slab 1 itself and resist the positive bending moment under earthquake. The carbon fiber cloth 3 has good deformation capacity and can continuously bear tensile force during the stress and deformation process of the precast floor slab 1, avoiding the sudden failure of the precast floor slab 1 due to brittle fracture. The transverse main beam 4 set below the carbon fiber cloth 3 runs along the long span of the floor slab. The transverse main beam 4 is arranged in a directional manner to reduce the mid-span bending moment of the floor slab and reduce the internal forces under seismic action. The two ends of the transverse main beam 4 are rigidly connected to the load-bearing wall 11 through the end plate 42 to form the support frame of the precast floor slab 1. The seismic load borne by the precast floor slab 1 is directly transferred to the lateral force resisting member load-bearing wall 11, thereby optimizing the force transfer path. The longitudinal secondary beam 41 set below the transverse main beam 4 is arranged along the short span direction of the floor slab to further refine the force unit. The transverse main beam 4 and the longitudinal secondary beam 41 intersect perpendicularly, dividing the precast floor slab 1 between the transverse main beam 4 into smaller force units, further reducing the internal forces of the floor slab and achieving the purpose of improving the seismic performance of the precast floor slab 1.

[0017] The bidirectional steel mesh 23 is located at the bottom of the post-cast concrete layer 22, and there is a certain distance between the bidirectional steel mesh 23 and the top surface of the load-bearing wall 11. Since the function of the bidirectional steel mesh 23 is to bear tensile force, the bidirectional steel mesh 23 needs to be arranged in the tension zone of the post-cast concrete layer 22, that is, at the bottom of the post-cast concrete layer 22. The bidirectional steel mesh 23 is at a certain distance from the load-bearing wall 11, so that the bottom of the bidirectional steel mesh 23 is also wrapped with concrete to form a protective layer, preventing the bidirectional steel mesh 23 from rusting and ensuring that it works together with the post-cast concrete layer 22.

[0018] The bottom of the precast floor slab 1 is ground to form a bonding surface. The carbon fiber cloth 3 is bonded to the bonding surface of the bottom of the precast floor slab 1 with epoxy resin adhesive. Before installing the carbon fiber cloth 3, the bottom of the precast floor slab 1 needs to be ground flat and the floating dust removed to form a bonding surface. First, a base layer of resin is applied, then a leveling adhesive is scraped on, and finally an impregnation resin is applied to bond the carbon fiber cloth 3 to the bonding surface of the bottom of the precast floor slab 1, so as to improve the bending load-bearing capacity and deformation capacity of the precast floor slab 1.

[0019] Several hangers 411 are installed inside the longitudinal secondary beam 41. The top of the hangers 411 is installed inside the precast floor slab 1 with structural adhesive. One end of the hanger 411 is connected to the longitudinal secondary beam 41, and the other end is connected to the bottom of the precast floor slab 1 through rebar and structural adhesive. This transfers the vertical load borne by the precast floor slab 1, including the vertical inertial force generated by the earthquake, to the longitudinal secondary beam 41. It can also restrain the excessive vertical displacement of the floor slab caused by vibration during an earthquake, prevent the floor slab from separating from the secondary beam, and ensure the continuous transfer of load.

[0020] An anchor rod 43 is screwed onto the inner side of the end plate 42. One side of the anchor rod 43 is installed inside the load-bearing wall 11. A pre-drilled hole 12 is provided on the side of the load-bearing wall 11 facing the end plate 42. The diameter of the pre-drilled hole 12 is larger than the diameter of the anchor rod 43. The anchor rod 43 screwed onto the inner side of the end plate 42 is used to rigidly connect the end plate 42 and the load-bearing wall 11. The end plate 42 is fully welded to the transverse main beam 4. After the anchor rod 43 is screwed into the inner side of the end plate 42, the worker can screw the washer nut to the outer side of the anchor rod 43 in sequence. The gasket is then pressed against the end plate 42 to improve the connection stability between the end plate 42 and the anchor rod 43. Then, the workers can first insert the anchoring agent into the preset hole 12, and then insert one end of the anchor rod 43 into the preset hole 12, so that the anchor rod 43 is firmly connected to the load-bearing wall 11 through the anchoring agent, thereby rigidly connecting the transverse main beam 4 and the load-bearing wall 11, so that the seismic load borne by the precast floor slab 1 can be transferred to the lateral force resisting component load-bearing wall 11, thereby improving the overall seismic resistance.

[0021] The working principle of this utility model is as follows: During installation, the workers first need to roughen the upper surface of the precast floor slab 1 and apply an interface agent. Then, the bidirectional steel mesh 23 is placed inside the upper reinforcement component 2. Next, the template 21 is placed above the precast floor slab 1, and the bidirectional steel mesh 23 is raised to a certain height using shims to prevent it from directly contacting the precast floor slab 1. At this time, the workers can pour concrete inside the upper reinforcement component 2. After the concrete layer 22 is poured and solidified, the template 21 can be removed to complete the reinforcement of the top of the precast floor slab 1. Then, the bottom of the precast floor slab 1 is ground smooth and the loose dust is removed to form an adhesive surface. First, a base layer of resin is applied, then leveling adhesive is scraped, and finally, impregnated resin is applied to bond the carbon fiber cloth 3 to the adhesive surface at the bottom of the precast floor slab 1. After completing the installation, the workers screw the anchor rod 43 into the inside of the end plate 42, and then screw the washer nut onto the outside of the anchor rod 43 in sequence, so that the washer presses the end plate 42 tightly. At this time, the workers can first insert the anchoring agent into the preset hole 12, and then insert one end of the anchor rod 43 into the preset hole 12, so that the end plate 42 is rigidly connected to the load-bearing wall 11. Then, the workers can place several transverse main beams 4 on the end plate 42 respectively, and fully weld the transverse main beams 4 to the end plate 42. Then, the workers can arrange several staggered beams under the transverse main beams 4, and weld the longitudinal secondary beams 41 to the transverse main beams 4. Then, the workers can insert the hanger rod 411 into the longitudinal secondary beam 41, and connect the top of the hanger rod 411 to the precast floor slab 1 through rebar and structural adhesive to complete the overall installation work.

[0022] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A floor structure comprising a prefabricated floor (1) which is provided on both sides with load-bearing walls (11), characterized in that: An upper reinforcement component (2) is provided above the precast floor slab (1). The upper reinforcement component (2) includes a template (21) and a post-cast concrete layer (22). The post-cast concrete layer (22) is poured inside the template (21). A two-way steel mesh (23) is provided inside the post-cast concrete layer (22). A carbon fiber cloth (3) is provided below the precast floor slab (1). Several transverse main beams (4) are evenly distributed horizontally below the carbon fiber cloth (3). Several longitudinal secondary beams (41) are evenly distributed vertically below the transverse main beams (4). Several transverse main beams (4) are connected to the load-bearing wall (11) through end plates (42).

2. A floor structure according to claim 1, characterised in that: The bidirectional steel mesh (23) is located at the bottom of the post-cast concrete layer (22), and there is a certain distance between the bidirectional steel mesh (23) and the top surface of the load-bearing wall (11).

3. A floor slab structure according to claim 1, characterized in that: The bottom of the precast floor slab (1) is formed by grinding to form an adhesive surface, and the carbon fiber cloth (3) is bonded to the adhesive surface at the bottom of the precast floor slab (1) by epoxy resin adhesive.

4. A floor slab structure according to claim 1, characterized in that: The longitudinal secondary beam (41) has several hangers (411) installed inside, and the top of the hangers (411) is installed inside the precast floor slab (1) with structural adhesive.

5. A floor slab structure according to claim 1, characterized in that: An anchor rod (43) is screwed to the inside of the end plate (42), and one side of the anchor rod (43) is installed inside the load-bearing wall (11).

6. A floor slab structure according to claim 5, characterized in that: The load-bearing wall (11) has a pre-set hole (12) on the side facing the end plate (42), and the diameter of the pre-set hole (12) is larger than the diameter of the anchor rod (43).

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