Novel composite floor slab based on UHPC

Abstract

The utility model relates to the field of building structures, and discloses a novel composite floor slab based on UHPC (Ultra High Performance Concrete), which comprises a prefabricated UHPC bottom plate, a thermal insulation layer and a concrete layer which are sequentially arranged from bottom to top, the broken bridge connecting piece penetrates through the heat preservation layer, and the two ends of the broken bridge connecting piece are fixedly connected with the prefabricated UHPC bottom plate and the concrete layer correspondingly; the keel frames are arranged on the upper surface of the heat preservation layer, extend in the width direction of the prefabricated UHPC bottom plate and are arranged at intervals in the length direction of the prefabricated UHPC bottom plate, and the keel frames at the upper ends of the broken bridge connecting pieces opposite to the keel frames are fixedly connected; the plurality of truss steel bars are vertically and fixedly connected with the plurality of keel frames, the plurality of truss steel bars and the plurality of keel frames are arranged in a grid shape, and the lower parts of the truss steel bars are embedded in the concrete layer. By arranging the heat preservation layer, the energy consumption of the building can be effectively reduced, heat transfer is reduced, and the building energy-saving standard is met. Meanwhile, due to the design of the broken bridge connecting piece, the heat bridge effect is avoided, and the heat preservation effect is further improved.

Description

Technical Field

[0001] This utility model relates to the field of building structures, and in particular to a novel composite floor slab based on UHPC. Background Technology

[0002] Traditional floor slabs have limitations in terms of thermal insulation, sound insulation, and structural rigidity. Regarding thermal insulation, conventional floor slabs often fail to meet increasingly stringent building energy efficiency standards, frequently requiring the addition of thick insulation layers, which increases construction costs and complexity. Poor sound insulation also negatively impacts the comfort of living and using the space.

[0003] Patent CN219033728U discloses a novel composite floor slab based on UHPC. Using UHPC as the base slab eliminates the need for pre-supporting bottom formwork in traditional concrete roof slab pouring, effectively reducing on-site construction workload. The use of autoclaved aerated concrete blocks as the floor slab filler increases the use of green building materials in the floor decking. This leverages the thermal insulation and sound insulation advantages of lightweight autoclaved aerated concrete while also reducing the slab's self-weight, resulting in lighter prefabricated components and improved structural seismic performance.

[0004] However, the patent still reveals several shortcomings in practical applications. Specifically, the structural feature of aerated concrete is that the cement paste forms honeycomb-like pores, which are interconnected, resulting in poor sound insulation, heat insulation, and moisture-proof performance.

[0005] Therefore, designing a composite floor slab with thermal insulation and sound insulation properties using UHPC has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The present invention aims to provide a novel composite floor slab based on UHPC to overcome the shortcomings mentioned above.

[0007] In order to achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A novel composite floor slab based on UHPC, comprising:

[0009] The precast UHPC base slab, insulation layer, and concrete layer are arranged sequentially from bottom to top.

[0010] A thermal break connector that penetrates the insulation layer, with both ends of the thermal break connector being fixedly connected to the precast UHPC base plate and the concrete layer, respectively.

[0011] Multiple keel frames are disposed on the upper surface of the insulation layer, the keel frames extending along the width direction of the prefabricated UHPC base plate and spaced apart along its length direction, and the upper end of the thermal break connector disposed opposite to the keel frame is fixedly connected to the keel frame; and

[0012] Multiple truss reinforcing bars are vertically fixedly connected to multiple keel frames, and the multiple truss reinforcing bars and multiple keel frames are arranged in a grid pattern, with the lower part of the truss reinforcing bars embedded in the concrete layer.

[0013] Furthermore, the upper surface of the insulation layer is provided with multiple mounting grooves, each corresponding to one of the multiple keel frames. A U-shaped positioning component is installed inside the mounting groove, and the keel frame is installed inside the positioning component. A thermal break strip is provided between the positioning component and the keel frame. A thermal break connector, which is opposite to the keel frame, passes through the positioning component and the thermal break strip in sequence and is fixedly connected to the keel frame.

[0014] Furthermore, the positioning element is an upward-opening channel steel, and the edge height of the channel steel flange is not lower than the height of the insulation layer.

[0015] Furthermore, the keel frame is a rectangular steel pipe, the bottom of the keel frame is embedded in the positioning member, and the top of the keel frame is vertically and fixedly connected to the truss reinforcement.

[0016] Furthermore, the upper end of the keel frame is provided with multiple mounting holes, which are arranged opposite to the thermal break connector.

[0017] Furthermore, the thermal break strip is made of extruded polystyrene board, and the thermal break connector is made of high-density polyurethane board or FRP connector.

[0018] Furthermore, the truss reinforcement includes:

[0019] Parallel and spaced-apart upper and lower chords, the lower chord being fixedly connected to the top of the keel frame; and

[0020] The web reinforcement has a continuous broken line structure and is fixedly connected to the upper chord and lower chord respectively.

[0021] Furthermore, the upper surface of the concrete layer is provided with a plurality of connecting grooves, which are parallel to the upper chord reinforcement and located between two adjacent upper chord reinforcements.

[0022] Furthermore, a lifting ring is fixedly connected to the upper surface of the concrete layer.

[0023] Furthermore, the insulation layer is made of molded polystyrene board or extruded polystyrene board.

[0024] Compared with the prior art, this utility model has at least the following advantages:

[0025] This invention, by incorporating an insulation layer, effectively reduces building energy consumption and heat transfer, thus meeting building energy conservation standards. Simultaneously, the design of the thermal break connector avoids the thermal bridging effect, further enhancing the insulation performance. Attached Figure Description

[0026] 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 based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the novel composite floor slab based on UHPC according to this utility model;

[0028] Figure 2 This is a three-dimensional sectional view of the novel composite floor slab based on UHPC according to this utility model;

[0029] Figure 3 This utility model Figure 2 A magnified view of a portion of region A in the middle;

[0030] Figure 4 This is a partial plan sectional view of the novel composite floor slab based on UHPC according to this utility model.

[0031] Reference numerals: 1. Precast UHPC base plate; 2. Insulation layer; 3. Concrete layer; 4. Thermal break connector; 5. Frame; 6. Mounting hole; 7. Truss reinforcement; 8. Mounting groove; 9. Positioning component; 10. Thermal break strip; 11. Connecting groove; 12. Lifting ring; 71. Top chord reinforcement; 72. Bottom chord reinforcement; 73. Web reinforcement. Detailed Implementation

[0032] 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 obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] 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.

[0034] Reference Figure 1-2This utility model proposes a novel composite floor slab based on UHPC. The floor slab, from bottom to top, consists of a precast UHPC base slab 1, an insulation layer 2, and a concrete layer 3. The precast UHPC base slab 1 is made of ultra-high performance concrete (UHPC) material, possessing high strength, high durability, and good toughness, effectively bearing the building's self-weight and service loads. The insulation layer 2 is laid on top of the precast UHPC base slab 1, providing thermal insulation and reducing heat exchange between the building's interior and exterior, as well as between floors, thus improving energy efficiency. The concrete layer 3, located on top and poured later, works synergistically with the underlying structure to enhance the overall performance of the floor slab.

[0035] It should be noted that although the precast UHPC base slab 1 has a higher cost, its high strength and durability reduce later maintenance costs. The insulation layer 2 can use common insulation materials, keeping costs under control. The overall design ensures floor slab performance while also considering economy.

[0036] In the composite floor slab, a thermal break connector 4 is provided that penetrates the insulation layer 2, with its two ends securely connected to the precast UHPC base slab 1 and the concrete layer 3, respectively. The function of the thermal break connector 4 is to achieve a reliable connection between the upper and lower structures, while preventing the formation of thermal bridges and reducing heat transfer. In actual implementation, the thermal break connector 4 can be made of high-density polyurethane board or FRP connectors. These materials not only have good thermal insulation performance but also sufficient strength to meet the connection requirements without affecting the thermal insulation effect.

[0037] In one embodiment of this utility model, the thermal break connector 4 is an FRP connector. The two ends of the FRP connector are respectively embedded in the precast UHPC base plate 1 and the concrete layer 3. The FRP connector has an anti-backflow structure in the middle and the insulation layer 2 is penetrated in the middle.

[0038] Combination Figure 3-4 Multiple keel frames 5 are installed on the upper surface of the insulation layer 2, extending along the width of the precast UHPC base slab 1 and spaced apart along its length. The keel frames 5 are fixedly connected to the upper ends of the thermal break connectors 4, forming a stable support structure. To ensure the accuracy and stability of the keel frame 5 installation, multiple installation grooves 8 are opened on the upper surface of the insulation layer 2, each corresponding to a keel frame 5. U-shaped positioning pieces 9 are installed within the installation grooves 8, and the keel frames 5 are placed within these positioning pieces 9. A thermal break strip 10 is provided between the positioning pieces 9 and the keel frames 5, preferably made of extruded polystyrene board, to reduce heat transfer between the keel frames 5 and the insulation layer 2. The thermal break connectors 4 pass sequentially through the positioning pieces 9 and the thermal break strip 10 and are fixed to the keel frames 5, which not only enhances the reliability of the connection but also further blocks the heat transfer path. The installation of the keel frames 5 and the truss reinforcement 7 enhances the load-bearing capacity and crack resistance of the concrete layer 3, giving the composite floor slab better mechanical properties and stability.

[0039] Specifically, the positioning component 9 is made of channel steel with an upward opening, and the edge height of the channel steel flange is not lower than the height of the insulation layer 2. The keel frame 5 is made of rectangular steel pipe, and its bottom is embedded in the positioning component 9 to ensure a tight fit. The top of the keel frame 5 is vertically fixed to the truss reinforcement 7, forming a grid structure together. In addition, the upper end of the keel frame 5 is provided with multiple mounting holes 6, which correspond to the thermal break connector 4, facilitating the installation and fixing of the thermal break connector 4, and also facilitating the pouring of the concrete layer 3 into the interior of the keel frame 5 during the later construction of the concrete layer 3.

[0040] Refer again Figure 1-2 The truss reinforcement 7 includes parallel and spaced-apart upper chord bars 71 and lower chord bars 72, with the lower chord bars 72 fixedly connected to the top of the frame 5. Between the upper chord bars 71 and lower chord bars 72, there are web bars 73 with a continuous broken line structure, which are fixed to the upper chord bars 71 and lower chord bars 72 respectively, forming a stable truss structure. This design of the truss reinforcement 7 can effectively enhance the load-bearing capacity and crack resistance of the concrete layer 3, and improve the overall mechanical properties of the composite floor slab.

[0041] In addition, distribution bars (not shown in the figure) are vertically fixed between the top chord bar 71 and the bottom chord bar 72. The distribution bars connected to the top chord bar 71 and the distribution bars connected to the bottom chord bar 72 are set accordingly. The two ends of the distribution bars penetrate the concrete layer 3, which facilitates the wet operation of subsequent connection between the composite floor slabs.

[0042] Several connecting grooves 11 are provided on the upper surface of the concrete layer 3. These connecting grooves 11 are parallel to the upper chord reinforcement 71 and located between two adjacent upper chord reinforcement 71. The setting of the connecting grooves 11 can increase the bonding area between the composite slab and the post-cast concrete, enhance the connection strength between the concrete layer 3 and the superstructure, and improve the overall stability. In addition, lifting rings 12 are fixedly connected to the upper surface of the concrete layer 3. The four lifting rings 12 are distributed in a rectangular array, and the bottom of the lifting rings 12 is embedded in the concrete layer 3, which facilitates the hoisting and transportation of the composite floor slab and improves construction efficiency.

[0043] The insulation layer 2 can be made of molded polystyrene board or extruded polystyrene board. Both of these materials have excellent thermal insulation performance, which can effectively reduce building energy consumption, while also having a certain strength and durability, making them suitable for the building's operating environment.

[0044] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A new type of composite floor slab based on UHPC, characterized in that, include: The precast UHPC base plate (1), insulation layer (2) and concrete layer (3) are arranged sequentially from bottom to top; A thermal break connector (4) penetrates the insulation layer (2), and the two ends of the thermal break connector (4) are fixedly connected to the precast UHPC base plate (1) and the concrete layer (3) respectively. Multiple keel frames (5) are disposed on the upper surface of the insulation layer (2). The keel frames (5) extend along the width direction of the prefabricated UHPC base plate (1) and are spaced apart along its length direction. The upper end of the thermal break connector (4) disposed opposite to the keel frame (5) is fixedly connected to the keel frame (5). Multiple truss steel bars (7) are vertically fixedly connected to multiple keel frames (5), and the multiple truss steel bars (7) and multiple keel frames (5) are arranged in a grid pattern. The lower part of the truss steel bars (7) is embedded in the concrete layer (3).

2. A new type of UHPC based composite floor slab according to claim 1, characterized in that, The upper surface of the insulation layer (2) is provided with a plurality of mounting grooves (8), and the plurality of mounting grooves (8) are provided one-to-one with the plurality of keel frames (5). A "U"-shaped positioning component (9) is installed inside the mounting groove (8), and the keel frame (5) is provided inside the positioning component (9). A thermal break strip (10) is provided between the positioning component (9) and the keel frame (5). The thermal break connector (4) provided opposite to the keel frame (5) passes through the positioning component (9) and the thermal break strip (10) in sequence and is fixedly connected to the keel frame (5).

3. A new type of UHPC based composite floor slab according to claim 2, characterized in that, The positioning element (9) is an upward-opening channel steel, and the edge height of the channel steel flange is not lower than the height of the insulation layer (2).

4. A new type of UHPC based composite floor slab according to claim 3, characterized in that, The keel frame (5) is a rectangular steel pipe. The bottom of the keel frame (5) is embedded in the positioning member (9), and the top of the keel frame (5) is vertically fixedly connected to the truss reinforcement (7).

5. A new type of UHPC based composite floor slab according to claim 4, characterized in that, The upper end of the keel frame (5) is provided with a plurality of mounting holes (6), which are arranged opposite to the broken bridge connector (4).

6. The novel composite floor slab based on UHPC according to claim 5, characterized in that, The thermal break strip (10) is made of extruded polystyrene board, and the thermal break connector (4) is made of high-density polyurethane board or FRP connector.

7. A new type of UHPC based composite floor slab according to claim 4, characterized in that, The truss reinforcement (7) includes: Parallel and spaced-apart upper chord ribs (71) and lower chord ribs (72), the lower chord ribs (72) being fixedly connected to the top of the keel frame (5); and The web reinforcement (73) has a continuous broken line structure and is fixedly connected to the upper chord reinforcement (71) and the lower chord reinforcement (72) respectively.

8. A new type of UHPC based composite floor slab according to claim 7, characterized in that, The upper surface of the concrete layer (3) is provided with a plurality of connecting grooves (11), the connecting grooves (11) being parallel to the upper chord reinforcement (71) and located between two adjacent upper chord reinforcements (71).

9. A new type of UHPC based composite floor slab according to claim 8, characterized in that, A lifting ring (12) is fixedly connected to the upper surface of the concrete layer (3).

10. A new type of UHPC based composite floor slab according to claim 1, characterized in that, The insulation layer (2) is made of molded polystyrene board or extruded polystyrene board.

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