Sandwich thermal insulation floor slab, forming method thereof and prefabricated slab for sandwich thermal insulation floor slab

Abstract

The invention provides a sandwich heat preservation floor slab and a forming method thereof and a prefabricated slab for the sandwich heat preservation floor slab, and belongs to the field of heat preservation composite floor slabs, the sandwich heat preservation floor slab at least comprises two prefabricated slabs, the two prefabricated slabs are closely spliced and laid on a structural beam to achieve support-free, and a bottom plate part, to be poured, of the floor slab is formed. The prefabricated plate comprises prefabricated bottom plate layers and heat preservation layers, the heat preservation layers are formed on the prefabricated bottom plate layers, plate edges of the adjacent prefabricated bottom plate layers are closely spliced to form splicing seams, connecting grooves are formed in the positions, close to the splicing seams, of the heat preservation layers, notches of the connecting grooves in the adjacent heat preservation layers are opposite, and lap joint pieces are arranged in the connecting grooves of the adjacent heat preservation layers in a lap joint mode. A cast-in-place layer is formed on the heat preservation layer in a pouring mode, the cast-in-place layer at least covers the lap joint pieces, and the connecting grooves are filled with the cast-in-place layer to form a three-layer sandwich structure with the prefabricated bottom plate layer, the heat preservation layer and the cast-in-place layer.

Description

Technical Field

[0001] The invention belongs to the field of thermal insulation composite floor slabs, and in particular relates to a sandwich thermal insulation floor slab and a molding method thereof, and a prefabricated plate for the sandwich thermal insulation floor slab. Background Art

[0002] Sandwich insulation board (abbreviated as "sandwich insulation board") refers to a composite board formed by sandwiching insulation materials between two layers of concrete wall panels. It is generally widely used in exterior walls. It can enhance the energy-saving performance of exterior wall insulation, reduce the risk of exterior wall fire, increase the insulation life of wall panels, and thus reduce the maintenance cost of exterior walls.

[0003] With the continuous development of the concept of building energy conservation, the sandwich panels are now also used in floor slabs. However, the insulation layer generally uses looser insulation materials, which leads to the need to increase the thickness of the floor slab while meeting the structural strength and reduce the effective height.

[0004] like Figure 1 As shown, in the existing sandwich insulation floor, the prefabricated bottom plate 1a is obtained by tying the prefabricated steel frame and pouring concrete to solidify; the post-cast strip is formed at the beard ribs 11a between adjacent prefabricated bottom plates 1a, and the floor concrete 2a is cast on the prefabricated bottom plate 1a, and then the insulation layer 3a is laid, and finally a protective layer 4a is laid on the insulation layer 3a. When it is used as a two-way slab, the end of the prefabricated bottom plate layer cannot be closely joined because the beard ribs are exposed; and the insulation layer 3a is above the cast-in-place floor concrete 2, resulting in a reduction in the effective height of the floor and an increase in the actual thickness.

[0005] It should be noted that the information disclosed in the background technology section of the invention is only intended to deepen the understanding of the general background technology of the invention, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0006] One object of the present invention is to provide a sandwich insulation floor slab with strong cooperative working ability, small actual thickness and high effective height; The second object of the present invention is to provide a method for forming a sandwich thermal insulation floor slab with strong cooperative working ability, small actual thickness and high effective height.

[0007] In order to solve the above-mentioned first object, the present invention first provides a sandwich insulation floor, characterized in that it comprises: At least two prefabricated panels, the prefabricated panels comprising a prefabricated bottom plate layer and a thermal insulation layer, the thermal insulation layer being formed on the prefabricated bottom plate layer, the edges of adjacent prefabricated bottom plate layers being closely joined to form a joint, the thermal insulation layer being formed with a connecting groove near the joint, and the notches of the connecting grooves on adjacent thermal insulation layers being opposite; A lap joint, the lap joint being overlapped in the connecting groove of the adjacent thermal insulation layer; The cast-in-place layer is cast and formed on the thermal insulation layer and at least covers the lap joints and fills and connects the connecting grooves.

[0008] Preferably, there are multiple connecting grooves, and the multiple connecting grooves are arranged along the seam direction.

[0009] Preferably, the prefabricated bottom plate layer has bottom plate structural ribs therein, and the bottom plate structural ribs extend outside the prefabricated bottom plate layer to form a first connecting portion, and the first connecting portion is located in the connecting groove of the thermal insulation layer.

[0010] Preferably, the first connecting portion is a first hook portion; and a first structural longitudinal rib is provided between the first hook portion at the plurality of connecting grooves and the top surface of the thermal insulation layer.

[0011] Preferably, the two ends of the lap joint respectively form a second connection portion, and the second connection portions at the two ends of the lap joint are respectively located in the connection grooves of adjacent insulation layers.

[0012] Preferably, the second connecting portion is a second hook portion, and a second structural longitudinal reinforcement is provided between the second hook portion at the plurality of connecting grooves and the top surface of the thermal insulation layer.

[0013] Preferably, at positions opposite to each other on adjacent insulation layers, the notches of the connecting grooves are opposite to each other; and the length directions of the connecting grooves are in the same direction and / or relatively oblique to the span direction of the prefabricated panels.

[0014] The technical effects produced by the above technical solution of the present invention come from one or more of the following combinations: This solution achieves close splicing by grooving the sides of the insulation layer and connecting the structures with lap joints, and then filling the connecting grooves and lap joints by pouring the cast-in-place layer, thereby increasing the effective height of the connecting plates of adjacent precast panels, and overall reducing the actual thickness of the floor slabs and the floor load.

[0015] The unique sandwich structure enables the new floor to have excellent thermal insulation, sound insulation and fire prevention functions, and the sandwich layer and concrete have strong collaborative working ability.

[0016] Compared with the increase in the effective height of existing insulation floors, insulation floors with the same function are 20mm~30mm higher than traditional floors, which greatly increases the stiffness and strength of the floors.

[0017] Compared with the actual thickness reduction of existing insulation floors, insulation floors with the same function are 60mm thinner than traditional floor slabs, which reduces the floor load by more than 35%.

[0018] The two-way floor slab can achieve close connection. If the traditional composite floor slab is designed as a two-way floor slab, it is difficult to achieve close connection in the middle of the slab span unless the thickness of the floor slab is increased. However, this floor slab can achieve close connection under the existing level through side grooves and U-shaped ring buckle connection structure, thereby simplifying the construction process and reducing the generation of cold and hot bridges.

[0019] The U-shaped ring buckle connection can effectively reduce the connection length of the steel bars; the grooves on the side of the plate can increase the effective height of the plates at the connection part of adjacent precast plates.

[0020] To solve the above second purpose, the present invention provides a method for forming a sandwich insulation floor, characterized in that it comprises the following steps: Forming a prefabricated board, forming a thermal insulation layer on a prefabricated bottom plate layer to form a prefabricated board, and forming a connecting groove near the end of the thermal insulation layer; Assembling prefabricated panels, closely splicing the prefabricated panels along the span direction of the floor slab, so that the prefabricated bottom plate layers of adjacent prefabricated panels are closely spliced ​​to form a splicing seam, and the notches of the connecting grooves of adjacent insulation layers are opposite to each other at the splicing seam; Arranging overlapping pieces, and overlapping the overlapping pieces in the connecting grooves of the adjacent thermal insulation layers; Casting the cast-in-place layer, casting the cast-in-place layer on the thermal insulation layer, and at least covering the lap joints and filling the connecting grooves.

[0021] Preferably, when forming the prefabricated board, the end of the bottom plate structural rib in the prefabricated bottom plate layer is extended outside the prefabricated bottom plate layer to form a first connecting portion located in the connecting groove of the insulation layer; when arranging the lap joint, a second connecting portion is formed at both ends of the lap joint, and the second connecting portions at both ends of the lap joint are respectively located in the connecting grooves of adjacent insulation layers.

[0022] Preferably, the first connecting portion is a first hook portion, and a first structural longitudinal reinforcement is passed through the first hook portion at the plurality of connecting grooves and the top surface of the insulation layer; the second connecting portion is a second hook portion, and a second structural longitudinal reinforcement is passed through the second hook portion at the plurality of connecting grooves and the top surface of the insulation layer.

[0023] The technical effects produced by the above technical solution of the present invention come from one or more of the following combinations: This solution simplifies the construction process. It only requires placing steel mesh and pouring surface concrete directly on this product. Compared with traditional composite slabs, in addition to placing steel mesh and pouring surface concrete, it is also necessary to lay an insulation layer and then pour a protective layer on the insulation layer. This increases the actual thickness of the existing technology but does not increase the effective height.

[0024] This solution achieves close splicing by grooving the sides of the insulation layer and connecting the structures with lap joints, and then filling the connecting grooves and lap joints by pouring the cast-in-place layer, thereby increasing the effective height of the connecting plates of adjacent precast panels, and overall reducing the actual thickness of the floor slabs and the floor load.

[0025] The unique sandwich structure enables the new floor to have excellent thermal insulation, sound insulation and fire prevention functions, and the sandwich layer and concrete have strong collaborative working ability.

[0026] Compared with the increase in the effective height of existing insulation floors, insulation floors with the same function are 20mm~30mm higher than traditional floors, which greatly increases the stiffness and strength of the floors.

[0027] Compared with the actual thickness reduction of existing insulation floors, insulation floors with the same function are 60mm thinner than traditional floor slabs, which reduces the floor load by more than 35%.

[0028] The two-way floor slab can achieve close connection. If the traditional composite floor slab is designed as a two-way floor slab, it is difficult to achieve close connection in the middle of the slab span unless the thickness of the floor slab is increased. However, this floor slab can achieve close connection under the existing level through side grooves and U-shaped ring buckle connection structure, thereby simplifying the construction process and reducing the generation of cold and hot bridges.

[0029] The U-shaped ring buckle connection can effectively reduce the connection length of the steel bars; the grooves on the side of the plate can increase the effective height of the plates at the connection part of adjacent precast plates.

[0030] To solve one of the above purposes, the present invention provides a prefabricated board for sandwich insulation floor, characterized in that the prefabricated board includes a prefabricated bottom plate layer and an insulation layer, the insulation layer is formed on the prefabricated bottom plate layer, and a connecting groove is formed near the end of the insulation layer.

[0031] Preferably, the prefabricated bottom plate layer has bottom plate structural ribs therein, and ends of the bottom plate structural ribs extend outside the prefabricated bottom plate layer to form a first connecting portion, and the first connecting portion is located in the connecting groove of the thermal insulation layer.

[0032] The technical effects produced by the above technical solution of the present invention come from one or more of the following combinations: The structure of this solution has a high degree of prefabrication, and it only needs to place the steel mesh directly on this product and pour the surface concrete. Compared with the traditional composite slab, in addition to placing the steel mesh and pouring the surface concrete, it is also necessary to lay the insulation layer and then pour the protective layer on the insulation layer; the actual thickness of the existing technology increases, but the effective height does not increase.

[0033] This solution achieves close splicing by cutting grooves on the side of the insulation layer and cooperating with the lap joint connection structure, and then fills the connection grooves and lap joints by pouring the cast-in-place layer, thereby increasing the effective height of the connecting plates of adjacent precast panels and generally reducing the actual thickness of the floor slab and the floor load. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A structural schematic diagram of the prior art is presented.

[0035] Figure 2 The schematic diagram of the structure of the sandwich insulation floor in the present invention is expressed.

[0036] Figure 3 The structural explosion diagram of the sandwich insulation floor in the present invention is expressed.

[0037] Figure 4 The schematic diagram of assembling the prefabricated panels in the present invention is expressed.

[0038] Figure 5 The structural display diagram of the prefabricated panel in the present invention is expressed.

[0039] Figure 6 A diagram showing the positions of the overlap members and the prefabricated bottom slab layer in the present invention.

[0040] Figure 7 A close-fitting display diagram of the prefabricated bottom plate layer in the present invention is expressed.

[0041] Figure 8 A comparison diagram of the effective heights of the sandwich insulation floor slab of the present invention and the existing structure is expressed.

[0042] Fig. 9 The load displacement diagram of the sandwich insulation floor slab in the present invention and the conventional floor slab is expressed.

[0043] Fig.10 A heat transfer coefficient diagram of the sandwich insulation floor in the present invention is expressed.

[0044] Fig.11 A step diagram of the forming method of the sandwich insulation floor slab in the present invention is expressed.

[0045] Among them: 1a, precast base plate; 11a, beard reinforcement; 2a, cast-in-place floor concrete; 3a, insulation layer; 4a, protective layer; 1, precast base plate layer; 11, base plate structural reinforcement; 111, first connecting part; 2, insulation layer; 20, connecting groove; 3, cast-in-place layer; 4, lap joint; 41, second connecting part; 5, first structural longitudinal reinforcement; 6, second structural longitudinal reinforcement. DETAILED DESCRIPTION

[0046] The following description is given to enable those skilled in the art to implement and use the invention and incorporate it into a specific application context. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Thus, the present invention is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0047] In the following detailed description, many specific details are set forth to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the practice of the present invention need not be limited to these specific details. In other words, known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present invention.

[0048] The reader is reminded of all documents and literature filed simultaneously with this specification and open to public inspection, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) can be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features.

[0049] Note that, where used, the symbols left, right, front, back, top, bottom, forward, reverse, clockwise and counterclockwise are used only for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or direction between the various parts of the object. In addition, the terms "first" and "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Note that, in the case of use, further, preferably, further and more preferably are simple beginnings for explaining another embodiment based on the previous embodiment, and the content of further, preferably, further or more preferably followed by the above embodiment is combined with the previous embodiment as a complete composition of another embodiment. Several further, preferably, further or more preferably settings followed by the same embodiment can be arbitrarily combined to form another embodiment.

[0052] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0053] Embodiment 1: See also Figure 2~Figure 7 This embodiment provides a sandwich insulation floor, which includes at least two prefabricated panels. The two prefabricated panels are closely laid on the structural beam to achieve support-free and form the bottom plate part of the floor to be cast. The prefabricated panel includes a prefabricated bottom plate layer 1 and an insulation layer 2. The insulation layer 2 is formed on the prefabricated bottom plate layer 1. The edges of adjacent prefabricated bottom plate layers 1 are closely laid to form a joint 10. The insulation layer 2 is formed with a connecting groove 20 near the joint 10. The notches of the connecting grooves 20 on adjacent insulation layers 2 are opposite, and the connecting grooves 20 of adjacent insulation layers 2 are overlapped with overlapping pieces 4. A cast-in-place layer 3 is cast on the insulation layer 2. The cast-in-place layer 3 at least covers the overlapping pieces 4 and fills the connecting grooves 20 to form a three-layer sandwich structure of the prefabricated bottom plate layer 1, the insulation layer 2 and the cast-in-place layer 3.

[0054] In this embodiment, the prefabricated floor layer 1 includes floor structural ribs 11 and prefabricated floor concrete; the prefabricated floor layer 1 can be a prestressed board. Unlike the traditional prestressed composite floor, the prefabricated floor layer 1 in this embodiment has no ribs at both ends for close splicing. Alternatively, the prefabricated floor layer 1 can also be a high-performance concrete board with structural ribs inside, a fiber concrete board, etc.

[0055] The insulation layer 2 is made of insulation mortar or insulation concrete, and in this embodiment, polystyrene concrete is preferably used to achieve insulation effect. During the molding process of the prefabricated board, the insulation layer 2 and the prefabricated bottom plate layer 1 are integrally formed by layered pouring. A plurality of connecting grooves 20 are provided at both ends of the insulation layer 2, and the plurality of connecting grooves 20 are arranged along the direction of the joint 10. For further information, please refer to Figure 4 and Figure 5 The notch of the connecting groove 20 is flush with the end of the prefabricated bottom plate layer 1, which is to facilitate the forming of the thermal insulation layer 2 and the connecting groove 20, but this should not be used as a limitation of this embodiment. In the specific process of casting and forming the prefabricated board, a mold (such as an iron box, etc.) is set at the position of the connecting groove 20, and the mold is removed at the initial setting after casting to form the connecting groove 20.

[0056] As a preferred implementation of this embodiment, the length direction of the connecting groove 20 is consistent with the span direction of the prefabricated bottom plate layer 1, that is, perpendicular to the direction of the joint 10, and is arranged at intervals along the direction of the joint 10. However, this is not the only implementation of this embodiment. Optionally, the length direction of the connecting groove 20 can also be relatively oblique to the span direction of the prefabricated board, that is, the connecting groove is not perpendicular to the direction of the joint 10 when the groove openings are opposite.

[0057] In order to improve the connection integrity of the prefabricated bottom slab layer 1, the insulation layer 2 and the cast-in-place layer 3. Figure 4 and Figure 7 In this embodiment, the bottom plate structural ribs 11 in the prefabricated bottom plate layer 1 extend outside the prefabricated bottom plate layer 1 to form a first connecting portion 111, and the first connecting portion 111 is located in the connecting groove 20 of the thermal insulation layer 2. Preferably, the first connecting portion 111 should be located in the connecting groove 20 and higher than the connecting groove 20. Preferably, the first connecting portion 111 is a first hook portion, and a first structural longitudinal rib 5 is provided between the first hook portions at the connecting grooves 20 and the top surface of the thermal insulation layer 2. The first structural longitudinal rib 5 can be welded to the first hook portion, or pressed against the top surface of the thermal insulation layer 2 by the first hook portion to form a stable assembly structure.

[0058] For further information, see Figure 4 , Figure 5 and Figure 6 , the two ends of the lap joint 4 respectively form a second connection part 41, and the second connection parts 41 at the two ends of the lap joint 4 are respectively located in the connection groove 20 of the adjacent insulation layer 2. Compared with the traditional floor slab, this embodiment as a two-way floor slab can achieve close splicing connection. If the traditional composite floor slab is designed as a two-way floor slab, it is difficult to achieve close splicing connection in the middle of the slab span unless the thickness of the floor slab is increased. However, the floor slab can achieve close splicing connection at the existing level through the side grooves and the connection structure of the lap joint 4, thereby simplifying the construction process and reducing the generation of cold and hot bridges (see Fig.10 ). Further, the second connecting portion 41 is a second hook portion, and a second structural longitudinal rib 6 is provided between the second hook portion at the plurality of connecting grooves 20 and the top surface of the thermal insulation layer 2. Preferably, the lap joint 4 is a lap rib, and its shape is preferably a U-shaped buckle, and the second hook portion is formed at the buckle sections at both ends of the U-shaped buckle. Similarly, the second structural longitudinal rib 6 can be welded to the second hook portion, or pressed against the top surface of the thermal insulation layer 2 by the second hook portion to form a stable assembly structure.

[0059] See also Figure 8 Combined with Figure 1 , Figure 8 The structural comparison between this solution and the prior art described in the background technology is shown. The effective height of the floor slab in this solution is equal to the actual floor slab thickness, which is calculated in (mm) as follows: This scheme: effective height 155 = prefabricated bottom plate layer 35 + insulation layer 50 + cast-in-place layer 70; Figure 1 Medium structure: effective height 130 = precast base slab 60 + cast-in-place floor concrete 70, while actual height 215 = precast base slab 60 + cast-in-place floor concrete 70 + insulation layer 50 + protective layer 35.

[0060] It can be seen that compared with the increase in the effective height of the existing insulation floor, the insulation floor with the same function is 20mm~30mm (25mm) higher than the traditional floor, which greatly increases the stiffness and strength of the floor; compared with the actual thickness of the existing insulation floor, the insulation floor with the same function is 60mm lower than the traditional floor, which reduces the floor load by more than 35% (see Fig. 9 ).

[0061] Beneficial effects of this embodiment: This solution achieves close splicing by grooving the side of the insulation layer 2 and connecting the lap joints 4, and then filling the connecting grooves 20 and the lap joints 4 by pouring the cast-in-place layer 3, thereby increasing the effective height of the connecting plates of adjacent prefabricated panels and generally reducing the actual thickness of the floor slab and the floor load.

[0062] The unique sandwich structure enables the new floor to have excellent thermal insulation, sound insulation and fire prevention functions, and the sandwich layer and concrete have strong collaborative working ability.

[0063] Compared with the increase in the effective height of existing insulation floors, insulation floors with the same function are 20mm~30mm higher than traditional floors, which greatly increases the stiffness and strength of the floors.

[0064] Compared with the actual thickness reduction of existing insulation floors, insulation floors with the same function are 60mm thinner than traditional floor slabs, which reduces the floor load by more than 35%.

[0065] The two-way floor slab can achieve close connection. If the traditional composite floor slab is designed as a two-way floor slab, it is difficult to achieve close connection in the middle of the slab span unless the thickness of the floor slab is increased. However, this floor slab can achieve close connection under the existing level through side grooves and U-shaped ring buckle connection structure, thereby simplifying the construction process and reducing the generation of cold and hot bridges.

[0066] The U-shaped ring buckle connection can effectively reduce the connection length of the steel bars; the grooves on the side of the plate can increase the effective height of the plates at the connection part of adjacent precast plates.

[0067] Embodiment 2: See also Fig.11 Combined with Figure 1 to Figure 7 This embodiment provides a method for forming a sandwich insulation floor, comprising the following steps: S1: Forming precast panels.

[0068] Specifically, the thermal insulation layer 2 is formed on the prefabricated bottom plate layer 1 to form a prefabricated board, and a connecting groove 20 is formed near the end of the thermal insulation layer 2 .

[0069] See also Figure 5 and Figure 6 In this embodiment, the prefabricated floor layer 1 includes floor structural ribs 11 and prefabricated floor concrete; the prefabricated floor layer 1 can be a prestressed board. Unlike the traditional prestressed composite floor, the prefabricated floor layer 1 in this embodiment has no ribs at both ends for close splicing. Alternatively, the prefabricated floor layer 1 can also be a high-performance concrete board with structural ribs inside, a fiber concrete board, etc.

[0070] The insulation layer 2 uses insulation mortar or insulation concrete, and in this embodiment, it can be preferably polystyrene concrete to achieve insulation effect. In the molding process of the prefabricated board, the insulation layer 2 and the prefabricated bottom plate layer 1 are integrally formed by layered pouring. A plurality of connecting grooves 20 are arranged at both ends of the insulation layer 2, and the plurality of connecting grooves 20 are arranged along the direction of the joint 10. Furthermore, the notch of the connecting groove 20 is flush with the end of the prefabricated bottom plate layer 1, which is to facilitate the molding of the insulation layer 2 and the connecting groove 20, but this should not be used as a limitation of this embodiment. In the specific casting and molding process of the prefabricated board, by setting a mold (such as an iron box, etc.) at the position of the connecting groove 20, the mold can be removed at the initial setting after pouring to form the connecting groove 20.

[0071] As a preferred implementation of this embodiment, the length direction of the connecting groove is consistent with the span direction of the prefabricated bottom plate layer 1, that is, perpendicular to the direction of the joint 10, and is arranged at intervals along the direction of the joint 10. However, this is not the only implementation of this embodiment. Optionally, the length direction of the connecting groove 20 can also be relatively oblique to the span direction of the prefabricated board, that is, the connecting groove is not perpendicular to the direction of the joint 10 when the groove openings are opposite.

[0072] In order to improve the connection integrity of the prefabricated bottom plate layer 1, the insulation layer 2 and the cast-in-place layer 3. In this embodiment, the bottom plate structural ribs in the prefabricated bottom plate layer 1 extend outside the prefabricated bottom plate layer 1 to form a first connection portion 111, and the first connection portion 111 is located in the connection groove 20 of the insulation layer 2. Preferably, the first connection portion 111 should be located in the connection groove 20 and higher than the connection groove 20. Preferably, the first connection portion 111 is a first hook portion, and during the casting process of the prefabricated bottom plate layer 1, the bottom plate structural ribs 11 are bent upward to form the first hook portion.

[0073] A first structural longitudinal rib 5 is provided between the first hook portion at the plurality of connection grooves 20 and the top surface of the thermal insulation layer 2. The first structural longitudinal rib 5 can be welded to the first hook portion, or pressed against the top surface of the thermal insulation layer 2 by the first hook portion to form a stable assembly structure. This step can be implemented during factory prefabrication or during on-site assembly of prefabricated panels.

[0074] S2: Assembling precast panels.

[0075] For details, please combine Figure 4 and Figure 6 The prefabricated panels are closely assembled along the span direction of the floor slab, so that the prefabricated bottom plate layers 1 of adjacent prefabricated panels are closely assembled to form a joint 10, and the notches of the connecting grooves 20 of adjacent insulation layers 2 are opposite to each other at the joint 10.

[0076] As described above, after the prefabricated panel is assembled, a first structural longitudinal reinforcement 5 is passed between the first hook portion at the multiple connecting grooves 20 and the top surface of the insulation layer 2. The first structural longitudinal reinforcement 5 can be welded to the first hook portion, or pressed by the first hook portion to the top surface of the insulation layer 2 to form a stable assembly structure.

[0077] S3: Arrange the lap joint 4.

[0078] For details, please combine Figure 4 and Figure 5 , overlap the lap joint 4 in the connecting groove 20 of the adjacent insulation layer 2. The two ends of the lap joint 4 form a second connecting portion 41, and the second connecting portions 41 at the two ends of the lap joint 4 are respectively located in the connecting groove 20 of the adjacent insulation layer 2. Compared with the traditional floor slab, this embodiment can achieve a close connection as a two-way floor slab. If the traditional composite floor slab is designed as a two-way floor slab, it is difficult to achieve a close connection in the span of the plate unless the thickness of the floor slab is increased. However, this floor slab can achieve a close connection through the side grooves and the lap joint 4 connection structure at the existing level, thereby simplifying the construction process and reducing the generation of cold and hot bridges. Further, the second connecting portion 41 is a second hook portion, and a second structural longitudinal rib 6 is provided between the second hook portions at the multiple connecting grooves 20 and the top surface of the insulation layer 2. Preferably, the lap joint 4 is implemented as a lap rib, and its shape is preferably a U-shaped buckle, and the second hook portion is formed at the two end buckle sections of the U-shaped buckle.

[0079] Similarly, the second structural longitudinal rib 6 can be welded to the second hook portion, or pressed against the second hook portion and clamped on the top surface of the thermal insulation layer 2 to form a stable assembly structure.

[0080] S4: pouring cast-in-place layer 3.

[0081] For details, please refer to Figure 3, cast the cast-in-place layer 3 on the insulation layer 2, and at least cover the lap joint 4, fill the connection groove 20 to form a three-layer sandwich structure of the prefabricated bottom plate layer 1, the insulation layer 2 and the cast-in-place layer 3. Preferably, when casting the cast-in-place layer 3, a steel mesh is laid on the insulation layer 2 as a structural member of the cast-in-place layer 3. The cast-in-place layer 3 can use steel fiber concrete to improve the structural strength.

[0082] Beneficial effects of this embodiment: This solution simplifies the construction process, and it is only necessary to place the steel mesh directly on this product and pour the surface concrete. Compared with the traditional composite slab, in addition to placing the steel mesh and pouring the surface concrete, it is also necessary to lay the insulation layer 2 and then pour the protective layer on the insulation layer 2; the actual thickness of the existing technology is increased, but the effective height is not increased.

[0083] This solution achieves close splicing by grooving the side of the insulation layer 2 and connecting the lap joints 4, and then filling the connecting grooves 20 and the lap joints 4 by pouring the cast-in-place layer 3, thereby increasing the effective height of the connecting plates of adjacent prefabricated panels and generally reducing the actual thickness of the floor slab and the floor load.

[0084] The unique sandwich structure enables the new floor to have excellent thermal insulation, sound insulation and fire prevention functions, and the sandwich layer and concrete have strong collaborative working ability.

[0085] Compared with the increase in the effective height of existing insulation floors, insulation floors with the same function are 20mm~30mm higher than traditional floors, which greatly increases the stiffness and strength of the floors.

[0086] Compared with the actual thickness reduction of existing insulation floors, insulation floors with the same function are 60mm thinner than traditional floor slabs, which reduces the floor load by more than 35%.

[0087] The two-way floor slab can achieve close connection. If the traditional composite floor slab is designed as a two-way floor slab, it is difficult to achieve close connection in the middle of the slab span unless the thickness of the floor slab is increased. However, this floor slab can achieve close connection under the existing level through side grooves and U-shaped ring buckle connection structure, thereby simplifying the construction process and reducing the generation of cold and hot bridges.

[0088] The U-shaped ring buckle connection can effectively reduce the connection length of the steel bars; the grooves on the side of the plate can increase the effective height of the plates at the connection part of adjacent precast plates.

[0089] Embodiment 3: See also Figure 7 , and combined with Figure 2~Figure 6 This embodiment also provides a prefabricated board for sandwich insulation floor, which includes a prefabricated bottom plate layer 1 and an insulation layer 2. The insulation layer 2 is formed on the prefabricated bottom plate layer 1, and a connecting groove 20 is formed near the end of the insulation layer 2.

[0090] In this embodiment, the prefabricated floor layer 1 includes floor structural ribs 11 and prefabricated floor concrete; the prefabricated floor layer 1 can be a prestressed board. Unlike the traditional prestressed composite floor, the prefabricated floor layer 1 in this embodiment has no ribs at both ends for close splicing. Alternatively, the prefabricated floor layer 1 can also be a high-performance concrete board with structural ribs inside, a fiber concrete board, etc.

[0091] The insulation layer 2 uses insulation mortar or insulation concrete, and in this embodiment, it can be preferably polystyrene concrete to achieve insulation effect. In the molding process of the prefabricated board, the insulation layer 2 and the prefabricated bottom plate layer 1 are integrally formed by layered pouring. A plurality of connecting grooves 20 are arranged at both ends of the insulation layer 2, and the plurality of connecting grooves 20 are arranged along the direction of the joint 10. Furthermore, the notch of the connecting groove 20 is flush with the end of the prefabricated bottom plate layer 1, which is to facilitate the molding of the insulation layer 2 and the connecting groove 20, but this should not be used as a limitation of this embodiment. In the specific casting and molding process of the prefabricated board, by setting a mold (such as an iron box, etc.) at the position of the connecting groove 20, the mold can be removed at the initial setting after pouring to form the connecting groove 20.

[0092] As a preferred implementation of this embodiment, the length direction of the connecting groove is consistent with the span direction of the prefabricated bottom plate layer 1, that is, perpendicular to the direction of the joint 10, and is arranged at intervals along the direction of the joint 10. However, this is not the only implementation of this embodiment. Optionally, the length direction of the connecting groove 20 can also be relatively oblique to the span direction of the prefabricated board, that is, the connecting groove is not perpendicular to the direction of the joint 10 when the groove openings are opposite.

[0093] In order to improve the connection integrity of the prefabricated bottom plate layer 1, the insulation layer 2 and the cast-in-place layer 3. In this embodiment, the bottom plate structural ribs in the prefabricated bottom plate layer 1 extend outside the prefabricated bottom plate layer 1 to form a first connection portion 111, and the first connection portion 111 is located in the connection groove 20 of the insulation layer 2. Preferably, the first connection portion 111 should be located in the connection groove 20 and higher than the connection groove 20. Preferably, the first connection portion 111 is a first hook portion, and a first structural longitudinal rib 5 is provided between the first hook portions at the plurality of connection grooves 20 and the top surface of the insulation layer 2. The first structural longitudinal rib 5 can be welded to the first hook portion, or pressed against the top surface of the insulation layer 2 by the first hook portion to form a stable assembly structure.

[0094] Beneficial effects of this embodiment: The structure of this solution has a high degree of prefabrication, and it is only necessary to place the steel mesh directly on this product and pour the surface concrete. Compared with the traditional composite slab, in addition to placing the steel mesh and pouring the surface concrete, it is also necessary to lay the insulation layer 2 and then pour the protective layer on the insulation layer 2; the actual thickness of the existing technology is increased, but the effective height is not increased.

[0095] This solution achieves close splicing by cutting grooves on the side of the insulation layer 2 and cooperating with the lap joints 4 to connect the structure, and then pouring the cast-in-place layer 3 to fill the connection grooves 20 and the lap joints 4, thereby increasing the effective height of the connecting plates of adjacent prefabricated panels, and overall reducing the actual thickness of the floor slabs and reducing the floor load.

[0096] Furthermore, the present invention is described in detail above in conjunction with the embodiments of the accompanying drawings, and a person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the present invention shall be protected by the scope defined by the attached claims.

Claims

1. Sandwich insulation floor, characterized in that: include: At least two prefabricated panels, the prefabricated panels comprising a prefabricated bottom plate layer and a thermal insulation layer, the thermal insulation layer being formed on the prefabricated bottom plate layer, the edges of adjacent prefabricated bottom plate layers being closely joined to form a joint, the thermal insulation layer being formed with a connecting groove near the joint, and the notches of the connecting grooves on adjacent thermal insulation layers being opposite; A lap joint, the lap joint being overlapped in the connecting groove of the adjacent thermal insulation layer; The cast-in-place layer is cast and formed on the thermal insulation layer and at least covers the lap joints and fills and connects the connecting grooves.

2. The sandwich insulation floor slab according to claim 1, characterized in that: There are multiple connecting grooves, and the multiple connecting grooves are arranged along the seam direction.

3. The sandwich insulation floor slab according to claim 2, characterized in that: The prefabricated bottom plate layer has bottom plate structural ribs therein, and the bottom plate structural ribs extend outside the prefabricated bottom plate layer to form a first connecting portion, and the first connecting portion is located in the connecting groove of the thermal insulation layer.

4. The sandwich insulation floor slab according to claim 3, characterized in that: The first connecting portion is a first hook portion; a first structural longitudinal rib is provided between the first hook portion at the plurality of connecting grooves and the top surface of the thermal insulation layer.

5. The sandwich insulation floor slab according to claim 2 or 3, characterized in that: The two ends of the lap joint respectively form a second connection portion, and the second connection portions at the two ends of the lap joint are respectively located in the connection grooves of adjacent insulation layers.

6. The sandwich insulation floor slab according to claim 5, characterized in that: The second connecting portion is a second hook portion, and a second structural longitudinal rib is provided between the second hook portions at the plurality of connecting grooves and the top surface of the thermal insulation layer.

7. The sandwich insulation floor slab according to claim 2, characterized in that: At opposite positions on adjacent insulation layers, the notches of the connecting grooves are opposite to each other; and the groove length directions of the connecting grooves are in the same direction and / or relatively oblique to the span direction of the prefabricated panels.

8. A method for forming a sandwich insulation floor, characterized in that: The following steps are involved: Forming a prefabricated board, forming a thermal insulation layer on a prefabricated bottom plate layer to form a prefabricated board, and forming a connecting groove near the end of the thermal insulation layer; Assembling prefabricated panels, closely splicing the prefabricated panels along the span direction of the floor slab, so that the prefabricated bottom plate layers of adjacent prefabricated panels are closely spliced ​​to form a splicing seam, and the notches of the connecting grooves of adjacent insulation layers are opposite to each other at the splicing seam; Arranging overlapping pieces, and overlapping the overlapping pieces in the connecting grooves of the adjacent thermal insulation layers; Casting the cast-in-place layer, casting the cast-in-place layer on the thermal insulation layer, and at least covering the lap joints and filling the connecting grooves.

9. The molding method according to claim 8, characterized in that: When forming the prefabricated board, the end of the bottom plate structural rib in the prefabricated bottom plate layer is extended outside the prefabricated bottom plate layer to form a first connecting portion located in the connecting groove of the thermal insulation layer; When the lap joint is arranged, second connection parts are respectively formed at both ends of the lap joint, and the second connection parts at both ends of the lap joint are respectively located in the connection grooves of adjacent insulation layers.

10. The molding method according to claim 9, characterized in that: The first connecting portion is a first hook portion, and a first structural longitudinal reinforcement is provided between the first hook portion at the plurality of connecting grooves and the top surface of the thermal insulation layer; The second connecting portion is a second hook portion, and a second structural longitudinal reinforcement is inserted between the second hook portion at the plurality of connecting grooves and the top surface of the thermal insulation layer.

11. The prefabricated board for sandwich thermal insulation floor as claimed in claims 1 to 7, characterized in that: The prefabricated board comprises a prefabricated bottom plate layer and a heat-insulating layer. The heat-insulating layer is formed on the prefabricated bottom plate layer, and a connecting groove is formed near the end of the heat-insulating layer.

12. The prefabricated panel according to claim 11, characterized in that: The prefabricated bottom plate layer has bottom plate structural ribs in it, and the ends of the bottom plate structural ribs extend outside the prefabricated bottom plate layer to form a first connecting portion, and the first connecting portion is located in the connecting groove of the thermal insulation layer.

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