3D printing sandwich thermal insulation wallboard as well as preparation and application thereof

Abstract

The invention relates to the technical field of constructional engineering, in particular to a 3D printing sandwich thermal insulation wallboard and preparation and application thereof. The invention provides a 3D printing sandwich thermal insulation wallboard. The 3D printing sandwich thermal insulation wallboard comprises a first square hollow formwork and a second square hollow formwork which are filled with post-pouring concrete or filled with UHPC. The first mold shell and the second mold shell are arranged in parallel in a spaced mode and connected through a connecting piece. A heat preservation layer is further filled between the first mold shell and the second mold shell; the heat preservation layer is allowed to wrap the connecting piece; wherein the first mold shell and the second mold shell are both 3D printing mold shells; the connecting piece is a 3D printing connecting piece. The 3D printing sandwich thermal insulation wallboard provided by the invention is good in structural performance, good in thermal insulation performance, good in durability and convenient to construct; wide application prospects are realized in the field of constructional engineering.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building engineering, and particularly relates to a 3D printing sandwich thermal insulation wallboard and preparation and application thereof. BACKGROUND

[0002] The sandwich thermal insulation wall, as a high-efficiency external wall insulation form, has been widely used. It is usually composed of three layers of inner leaf wall, thermal insulation layer and outer leaf wall, can place the thermal insulation material between the two layers of concrete structure, effectively avoid the problems of thermal insulation layer falling off, fire risk and poor durability of the external wall external thermal insulation system, and can realize the same service life of thermal insulation and structure. However, in the production process of the traditional sandwich thermal insulation wallboard, the inner and outer two layers of formwork need to be erected, and the positioning and hole opening of the connecting piece during laying are completed by manual work, which is complicated, long in construction period and difficult to guarantee the quality stability. If the automatic production line is used for production, it is difficult to adapt to the design requirements of building individualization and non-standardization.

[0003] In recent years, the building 3D printing technology has brought revolutionary changes to building engineering with its significant advantages of digitalization, automation and mold-free production. It can directly convert digital models into physical buildings, greatly improving construction efficiency and design freedom. However, when the 3D printing technology is applied to the production of the sandwich thermal insulation wall, it faces severe technical challenges. First, the existing technology cannot realize the integrated forming of the thermal insulation layer and the concrete structure layer during the printing process, and usually needs to print a layer of structure wall first, then manually lay the thermal insulation plate, and finally print another layer of structure wall. This step-by-step operation mode leads to the lack of effective connecting pieces between the inner and outer leaf walls, poor structural integrity and potential safety hazards. Second, the manual intervention breaks the continuity of the printing process, which is contrary to the original intention of 3D printing automation construction, and the efficiency improvement is limited. Finally, how to design a reliable inner and outer leaf wall connecting system that can perfectly match the printing process to ensure shear force transmission while avoiding thermal bridge effect has become a core technical bottleneck restricting the development of 3D printing sandwich thermal insulation wall.

[0004] Therefore, there is an urgent need in the field for an innovative 3D printing sandwich thermal insulation wallboard to overcome the inherent defects of the existing technology and realize the synchronous, integrated and automated construction of the thermal insulation layer and the structure layer during the printing process, so as to have excellent structural performance, thermal performance and construction efficiency. SUMMARY

[0005] In order to solve the above problems, the purpose of the present application is to provide a 3D printing sandwich thermal insulation wallboard and preparation and application thereof. The first formwork and / or the second formwork in the 3D printing sandwich thermal insulation wallboard of the present application allow customized design and can be applied to special-shaped wallboards. The 3D printing sandwich thermal insulation wallboard provided by the present application has good structural performance, good thermal insulation performance, good durability and convenient construction, and has a wide application prospect in the field of building engineering.

[0006] The object of the present application can be achieved by the following technical solutions: The first object of the present application is to provide a 3D-printed sandwich thermal insulation wallboard comprising a first formwork and a second formwork filled with post-cast concrete or UHPC, which are square and hollow. The first formwork and the second formwork are arranged in parallel and are connected by connecting pieces; the first formwork and the second formwork are also filled with a thermal insulation layer; the thermal insulation layer allows the connecting pieces to be wrapped. The first formwork and the second formwork are both 3D-printed formworks; the connecting pieces are 3D-printed connecting pieces.

[0007] In an embodiment of the present application, the inner surfaces of the first formwork and the second formwork are provided with protruding anchors.

[0008] In an embodiment of the present application, the anchors are arranged to enhance the bonding performance between the post-cast concrete or UHPC and the first formwork or the second formwork, preventing separation and slippage.

[0009] In an embodiment of the present application, when the first formwork is filled with post-cast concrete, the first formwork is provided with a mesh of reinforcement bars inside; When the second formwork is filled with post-cast concrete, the second formwork is provided with a mesh of reinforcement bars inside; The mesh of reinforcement bars is a 3D-printed mesh of reinforcement bars.

[0010] In an embodiment of the present application, when the first formwork is filled with UHPC with a thickness of 20 mm or more, the first formwork is provided with a mesh of reinforcement bars inside; When the second formwork is filled with UHPC with a thickness of 20 mm or more, the second formwork is provided with a mesh of reinforcement bars inside; The mesh of reinforcement bars is a 3D-printed mesh of reinforcement bars.

[0011] In an embodiment of the present application, the mesh of reinforcement bars is a two-way mesh.

[0012] In an embodiment of the present application, the diameter of the reinforcement bars and the number of layers of the mesh can be selected according to the size of the first formwork and the second formwork.

[0013] In an embodiment of the present application, the connecting pieces are provided in several numbers.

[0014] In an embodiment of the present application, the connecting pieces are selected from one or more of the following: sheet-shaped connecting pieces, rod-shaped connecting pieces, or X-shaped oblique bar-shaped connecting pieces.

[0015] In an embodiment of the present application, the thermal insulation layer is obtained by polyurethane foaming.

[0016] The second object of the present application is to provide a preparation method of the 3D-printed sandwich thermal insulation wallboard, comprising the following steps: (A1) generating three-dimensional data according to a design model, printing a first formwork, a mesh of reinforcing materials matched with the first formwork, a connecting piece, a second formwork and a mesh of reinforcing materials matched with the second formwork; (A2) pouring concrete in the first formwork, and pouring concrete in the second formwork after turning over; (A3) foaming polyurethane in the cavity between the first formwork and the second formwork to form a thermal insulation layer, thereby obtaining the 3D-printed sandwich thermal insulation wallboard; Or, (B1) generating three-dimensional data according to a design model, printing a first formwork, a connecting piece and a second formwork; (B2) filling UHPC in the first formwork, and filling UHPC in the second formwork after turning over; (B3) foaming polyurethane in the cavity between the first formwork and the second formwork to form a thermal insulation layer, thereby obtaining the 3D-printed sandwich thermal insulation wallboard.

[0017] The third object of the present application is to provide an application of the 3D-printed sandwich thermal insulation wallboard in the field of building engineering.

[0018] Compared with the prior art, the present application has the following beneficial effects: (1) The present application adopts 3D printing technology, which can easily manufacture sandwich thermal insulation wallboards with complex curved surfaces, special-shaped structures or personalized textures without incurring high costs of traditional molds, thereby meeting the diversified and customized needs of modern buildings in aesthetics and functions.

[0019] (2) The present application integrally prints the first formwork, the second formwork and the connecting piece, thereby ensuring reliable shear force transmission between the inner and outer concrete (or UHPC) plates and making the wallboard a whole; the present application fundamentally solves the risk of insufficient anchoring caused by traditional post-positioned connecting pieces, thereby greatly improving the safety of the wall.

[0020] (3) The present application adopts a foamed polyurethane thermal insulation layer, thereby solving the problem of needing to open holes in the thermal insulation board to pass through the connecting piece layer, simplifying the construction difficulty, improving the construction efficiency, completely avoiding the cold (hot) bridge formed by the leakage of concrete in the hole through which the connecting piece passes through the thermal insulation layer during concrete pouring, and further improving the thermal insulation performance of the wall. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a 3D-printed sandwich thermal insulation wallboard according to Embodiment 1; Figure 2A structural schematic diagram of a 3D-printed sandwich thermal insulation wallboard (without post-cast concrete and thermal insulation layer) according to Embodiment 1; Figure 3 A structural schematic diagram of a connecting piece in a 3D-printed sandwich thermal insulation wallboard according to Embodiment 1; The figure labels: 1, first formwork; 2, second formwork; 3, connecting piece; 4, reinforcement mesh; 5, anchor bolt; 6, thermal insulation layer; 7, post-cast concrete. DETAILED DESCRIPTION

[0022] The application will be described in detail below in conjunction with the drawings and specific embodiments.

[0023] In the following examples, the material of the first formwork, the second formwork, the reinforcement mesh, and the connecting piece is glass fiber reinforced plastic (GFRP), with a tensile strength ≥ 700 MPa and an interlayer shear strength ≥ 30 MPa; the post-cast concrete is C40 self-compacting concrete. Unless otherwise specified, the reagents used are commercially available reagents, the structures or components used are conventional structures or components in the art, and the detection means and methods used are conventional detection means and methods in the art.

[0024] Embodiment 1 This embodiment provides a 3D-printed sandwich thermal insulation wallboard, as shown in Figures 1-2 which includes post-cast concrete 7, square hollow first formwork 1 and second formwork 2; the first formwork 1 and the second formwork 2 are arranged in parallel and are connected by connecting pieces 3; the first formwork 1 and the second formwork 2 are also filled with a thermal insulation layer 6; the thermal insulation layer 6 allows the connecting pieces 3 to be wrapped; wherein the first formwork 1 and the second formwork 2 are both 3D-printed formworks; the connecting pieces 3 are 3D-printed connecting pieces 3; Further, the inner surfaces of the first formwork 1 and the second formwork 2 are provided with protruding anchor bolts 5 (to enhance the bonding performance between the post-cast concrete 7 and the first formwork 1 or the second formwork 2, and to prevent separation and slippage); the first formwork 1 and the second formwork 2 are both independently provided with a reinforcement mesh 4, which is a 3D-printed reinforcement mesh (a bidirectional mesh; in actual application, the diameter of the reinforcement and the number of layers of the mesh can be selected according to the size of the first formwork 1 and the second formwork 2).

[0025] Further, the connecting pieces 3 are arranged at intervals, and the connecting pieces 3 are internally hollow sheet-shaped connecting pieces (as shown in Figure 3 which can also be selected from one or more of sheet-shaped connecting pieces, rod-shaped connecting pieces, or X-shaped oblique reinforcement-shaped connecting pieces according to actual conditions); the thermal insulation layer 6 is obtained by polyurethane foaming.

[0026] Further, the anchor bolt 5 is composed of a cylindrical body and a hexagonal prism, the cylindrical body close to the surface of the formwork has a diameter of 12 mm (which can be set to 10-15 mm according to the embodiment) and a height of 20 mm, and the hexagonal prism has a diameter of 18 mm (which can be set to 15-20 mm according to the embodiment) and a height of 10 mm; The reinforcing mesh 4 is a double-layered and double-directional mesh with a diameter of 6 mm and a spacing of 150 mm; The thickness of the connecting piece 3 is 10 mm, and the height is 50 mm; The total thickness of the first formwork 1 is 55-60 mm, and the wall thickness is 5-10 mm; the total thickness of the second formwork 2 is 55-60 mm, and the wall thickness is 5-10 mm; The first formwork 1 and the second formwork 2 are respectively filled with 50 mm thick post-poured concrete 7; The spacing between the first formwork 1 and the second formwork 2 is 50 mm, and is filled with a foamed polyurethane thermal insulation layer.

[0027] Embodiment 2 The embodiment provides a preparation method of a 3D-printed sandwich thermal insulation wallboard (Embodiment 1), comprising the following steps: (A1) generating three-dimensional data (geometric dimensions and relative positions of each part) according to the design model of Embodiment 1, and sequentially printing a first formwork, a reinforcing mesh matched with the first formwork, a connecting piece, a second formwork, and a reinforcing mesh matched with the second formwork; (A2) pouring post-concrete in the first formwork, which is compacted without vibration due to the use of self-compacting concrete; when the strength of the concrete generally reaches more than 75% of the design strength, the wallboard is turned over, and post-concrete is poured in the second formwork after turning over; (A3) foaming polyurethane in the cavity between the first formwork and the second formwork to form a thermal insulation layer, and obtaining a 3D-printed sandwich thermal insulation wallboard.

[0028] The average heat transfer coefficient of the sandwich thermal insulation wallboard prepared in the embodiment is 0.6 W / m 2 ·K.

[0029] Embodiment 3 The embodiment provides a 3D-printed sandwich thermal insulation wallboard, which comprises post-poured concrete, a square hollow first formwork and a second formwork; the first formwork and the second formwork are arranged in parallel and are connected through a connecting piece; a thermal insulation layer is further filled between the first formwork and the second formwork; the thermal insulation layer allows to wrap the connecting piece; wherein the first formwork and the second formwork are both 3D-printed formworks; and the connecting piece is a 3D-printed connecting piece. Further, the inner surfaces of the first and second formworks are provided with protruding anchors (to enhance the bonding performance between the post-poured concrete and the first or second formwork, and prevent detachment and slippage); the interiors of the first and second formworks are each independently provided with a mesh of reinforcement bars, which is a 3D-printed mesh of reinforcement bars (a bidirectional mesh; in actual applications, the diameter of the reinforcement bars and the number of layers of the mesh can be selected according to the size of the first and second formworks).

[0030] Further, the connecting pieces are spaced apart and are internally hollow sheet-shaped connecting pieces (may also be selected from one or more of sheet-shaped connecting pieces, rod-shaped connecting pieces or X-shaped oblique bar-shaped connecting pieces according to actual conditions); the thermal insulation layer is obtained by polyurethane foaming.

[0031] Further, the anchors are composed of a cylindrical body and a hexagonal prism, the cylindrical body near the surface of the formwork has a diameter of 12 mm (may be set to 10-15 mm according to the embodiment) and a height of 20 mm, and the hexagonal prism has a diameter of 18 mm (may be set to 15-20 mm according to the embodiment) and a height of 10 mm; The mesh of reinforcement bars is a double-layer bidirectional mesh with a diameter of 6 mm and a spacing of 150 mm; The thickness of the connecting pieces is 15 mm and the height is 100 mm; The total thickness of the first formwork is 55-60 mm and the wall thickness is 5-10 mm; the total thickness of the second formwork is 55-60 mm and the wall thickness is 5-10 mm; The first and second formworks are each filled with 60 mm thick post-poured concrete; The spacing between the first and second formworks is 100 mm and is filled with a foamed polyurethane thermal insulation layer.

[0032] Example 4 The present embodiment provides a preparation method of the 3D-printed sandwich thermal insulation wallboard (Example 3), comprising the following steps: (A1) generating three-dimensional data (geometric dimensions and relative positions of each component) according to the design model of Example 3, and sequentially printing the first formwork, the mesh of reinforcement bars compatible with the first formwork, the connecting pieces, the second formwork and the mesh of reinforcement bars compatible with the second formwork; (A2) pouring concrete in the first formwork; since self-compacting concrete is used, no vibration is required for compaction; when the strength of the concrete generally reaches more than 75% of the design strength, the wallboard is flipped, and concrete is poured in the second formwork after flipping; (A3) foaming polyurethane in the cavity between the first and second formworks to form a thermal insulation layer, and obtaining a 3D-printed sandwich thermal insulation wallboard.

[0033] The average heat transfer coefficient of the sandwich thermal insulation wallboard prepared in this embodiment is 0.3 W / m 2 ·K.

[0034] Example 5 The embodiment provides a 3D-printed sandwich thermal insulation wallboard, which comprises filled post-cast concrete, a square hollow first formwork and a second formwork; the first formwork and the second formwork are arranged in parallel and are connected through connecting pieces; the first formwork and the second formwork are further filled with a thermal insulation layer; the thermal insulation layer allows to wrap the connecting pieces; wherein the first formwork and the second formwork are both 3D-printed formworks; the connecting pieces are 3D-printed connecting pieces; Further, the first formwork and the second formwork are provided with protruding anchor bolts on inner surfaces (to enhance the bonding performance between the post-cast concrete and the first formwork or the second formwork, and prevent separation and sliding); the first formwork and the second formwork are both independently provided with a mesh of reinforcement bars, and the mesh of reinforcement bars is a 3D-printed mesh of reinforcement bars (a bidirectional mesh; in actual application, the diameter of the reinforcement bar and the number of layers of the mesh can be selected according to the size of the first formwork and the second formwork).

[0035] Further, a plurality of connecting pieces are arranged at intervals, and the connecting pieces are plate-shaped connecting pieces with hollow interiors (which can also be selected from one or more of plate-shaped connecting pieces, rod-shaped connecting pieces or X-shaped diagonal bar-shaped connecting pieces according to actual conditions); the thermal insulation layer is obtained by polyurethane foaming.

[0036] Still further, the anchor bolt is composed of a cylindrical body and a hexagonal prism, the diameter of the cylindrical body close to the surface of the formwork is 12 mm (which can be set to 10-15 mm according to the embodiment), the height is 20 mm, and the diameter of the hexagonal prism at the end is 18 mm (which can be set to 15-20 mm according to the embodiment), and the height is 10 mm; The mesh of reinforcement bars is a double-layer bidirectional mesh with a diameter of 6 mm and a spacing of 150 mm; The thickness of the connecting piece is 20 mm, and the height is 200 mm; The total thickness of the first formwork is 55-60 mm, and the wall thickness is 5-10 mm; the total thickness of the second formwork is 55-60 mm, and the wall thickness is 5-10 mm; The first formwork and the second formwork are respectively filled with 60 mm thick post-cast concrete; The spacing between the first formwork and the second formwork is 200 mm, and the spacing is filled with a foamed polyurethane thermal insulation layer.

[0037] Example 6 The embodiment provides a preparation method of the 3D-printed sandwich thermal insulation wallboard (Example 5), which comprises the following steps: (A1) generating three-dimensional data (geometric dimensions of each component, relative position) according to the design model of embodiment 5, printing the first mold shell, the mesh of reinforcing materials matched with the first mold shell, the connecting piece, the second mold shell and the mesh of reinforcing materials matched with the second mold shell in sequence; (A2) pouring concrete in the first mold shell, which is compacted without vibration due to the use of self-compacting concrete; the wallboard is turned over when the strength of the concrete generally reaches more than 75% of the design strength, and then pouring concrete in the second mold shell after turning over; (A3) foaming polyurethane in the cavity between the first mold shell and the second mold shell to form a thermal insulation layer, thereby obtaining a 3D-printed sandwich thermal insulation wallboard.

[0038] The average heat transfer coefficient of the sandwich thermal insulation wallboard prepared in this embodiment is 0.16 W / m 2 ·K.

[0039] Embodiment 7 The embodiment provides a 3D-printed sandwich thermal insulation wallboard, which comprises filled post-cast concrete, a square hollow first mold shell and a second mold shell; the first mold shell and the second mold shell are arranged in parallel and are connected by connecting pieces; the first mold shell and the second mold shell are further filled with a thermal insulation layer; the thermal insulation layer allows to wrap the connecting pieces; wherein the first mold shell and the second mold shell are both 3D-printed mold shells; the connecting pieces are 3D-printed connecting pieces; Further, the inner surfaces of the first mold shell and the second mold shell are provided with protruding anchors (to enhance the bonding performance between the post-cast concrete and the first mold shell or the second mold shell, and prevent separation and sliding); the first mold shell and the second mold shell are both independently provided with a mesh of reinforcing materials, which is a 3D-printed mesh of reinforcing materials (a bidirectional mesh; in actual application, the diameter of the reinforcing material and the number of layers of the mesh can be selected according to the size of the first mold shell and the second mold shell).

[0040] Further, a plurality of connecting pieces are arranged at intervals, which are internally hollow sheet-shaped connecting pieces (which can also be selected from one or more of sheet-shaped connecting pieces, rod-shaped connecting pieces or X-shaped diagonal bar-shaped connecting pieces according to actual conditions); the thermal insulation layer is obtained by polyurethane foaming.

[0041] Still further, the anchor is composed of a cylindrical body and a hexagonal prism, the cylindrical body close to the surface of the mold shell has a diameter of 12 mm (which can be set to 10-15 mm according to the embodiment), and a height of 20 mm, and the terminal hexagonal prism has a diameter of 18 mm (which can be set to 15-20 mm according to the embodiment), and a height of 10 mm; The mesh of reinforcing materials is a double-layer bidirectional mesh with a diameter of 6 mm and a spacing of 150 mm; The thickness of the connecting piece is 25 mm, and the height is 250 mm; The total thickness of the first mold shell is 55-60 mm, and the wall thickness is 5-10 mm; the total thickness of the second mold shell is 55-60 mm, and the wall thickness is 5-10 mm; The first mold shell and the second mold shell are respectively filled with 60 mm thick post-cast concrete; The spacing between the first mold shell and the second mold shell is 250 mm, and is filled with a foamed polyurethane thermal insulation layer.

[0042] Example 8 The embodiment provides a preparation method of a 3D printed sandwich thermal insulation wallboard (Example 7), comprising the following steps: (A1) generating three-dimensional data (geometric dimensions of each component, relative position) according to the design model of Example 7, and sequentially printing a first mold shell, a mesh of reinforcing materials matched with the first mold shell, a connecting piece, a second mold shell and a mesh of reinforcing materials matched with the second mold shell; (A2) post-casting concrete in the first mold shell, which is compacted without vibration due to the use of self-compacting concrete; the wallboard is turned over when the strength of the concrete generally reaches more than 75% of the design strength, and post-casting concrete in the second mold shell after turning over; (A3) foaming polyurethane in the cavity between the first mold shell and the second mold shell to form a thermal insulation layer, and obtaining the 3D printed sandwich thermal insulation wallboard.

[0043] The average heat transfer coefficient of the sandwich thermal insulation wallboard prepared in the embodiment is 0.13 W / m 2 ·K.

[0044] Example 9 The embodiment provides a 3D printed sandwich thermal insulation wallboard, which comprises a first mold shell and a second mold shell filled with UHPC and square hollow; the first mold shell and the second mold shell are arranged in parallel and are connected through a connecting piece; the first mold shell and the second mold shell are further filled with a thermal insulation layer; the thermal insulation layer allows to wrap the connecting piece; wherein the first mold shell and the second mold shell are both 3D printed mold shells; the connecting piece is a 3D printed connecting piece; Further, the inner surfaces of the first mold shell and the second mold shell are provided with protruding anchors (to enhance the bonding performance between UHPC and the first mold shell or the second mold shell, and prevent separation and sliding); When the thickness of the UHPC is more than 20 mm, a mesh of reinforcing materials is independently arranged in the first mold shell and the second mold shell, and the mesh of reinforcing materials is a 3D printed mesh of reinforcing materials (a bidirectional mesh; in actual application, the diameter of the reinforcing material and the number of layers of the mesh can be selected according to the size of the first mold shell and the second mold shell); When the thickness of the UHPC is less than 20 mm, no mesh of reinforcing materials is arranged.

[0045] Further, the connecting pieces are arranged at intervals, and the connecting pieces are selected from one or more of a sheet-shaped connecting piece, a rod-shaped connecting piece, or an X-shaped oblique insert rib-shaped connecting piece; and the thermal insulation layer is obtained by polyurethane foaming.

[0046] Embodiment 10 The embodiment provides a preparation method of a 3D-printed sandwich thermal insulation wallboard, and the method comprises the following steps: (B1) generating three-dimensional data (geometric dimensions of each component, relative position) according to a design model, and sequentially printing a first formwork, a rib mesh material sheet matched with the first formwork, a connecting piece, a second formwork, and a rib mesh material sheet matched with the second formwork; (B2) filling UHPC in the first formwork, and then filling UHPC in the second formwork after turning over; (B3) foaming polyurethane in a cavity between the first formwork and the second formwork to form a thermal insulation layer, and obtaining the 3D-printed sandwich thermal insulation wallboard.

[0047] The above description of the embodiments is for facilitating the ordinary skilled in the art to understand and use the application. Those skilled in the art can easily make various modifications to the embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the application is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art according to the explanation of the application without departing from the scope of the application should be within the protection scope of the application.

Claims

1. A 3D-printed sandwich insulation wall panel, characterized in that, This includes filling with post-cast concrete or filling with UHPC, and a square hollow first and second formwork. The first and second mold shells are arranged in parallel and spaced apart, and connected by a connector; an insulation layer is also filled between the first and second mold shells; the insulation layer allows the connector to be wrapped. Wherein, both the first mold shell and the second mold shell are 3D printed mold shells; the connector is a 3D printed connector.

2. The 3D-printed sandwich insulation wall panel according to claim 1, characterized in that, The inner surfaces of the first mold shell and the second mold shell are provided with protruding anchor bolts.

3. The 3D-printed sandwich insulation wall panel according to claim 1, characterized in that, When the first formwork is filled with post-cast concrete, a reinforcing mesh is installed inside the first formwork. When the second mold shell is filled with post-cast concrete, a reinforcing mesh is provided inside the second mold shell; the reinforcing mesh is a 3D printed reinforcing mesh.

4. A 3D-printed sandwich insulation wall panel according to claim 3, characterized in that, When the first mold shell is filled with UHPC with a thickness of 20mm or more, a reinforcing mesh is provided inside the first mold shell. When the second mold shell is filled with UHPC with a thickness of 20mm or more, a reinforcing mesh is provided inside the second mold shell; The reinforcing mesh is a 3D printed reinforcing mesh.

5. A 3D-printed sandwich insulation wall panel according to claim 4, characterized in that, The reinforcing mesh is a two-way mesh.

6. A 3D-printed sandwich insulation wall panel according to claim 1, characterized in that, Several connectors are provided.

7. A 3D-printed sandwich insulation wall panel according to claim 1, characterized in that, The connector is selected from one or more of the following: sheet connector, rod connector, or X-shaped oblique insert rib connector.

8. A 3D-printed sandwich insulation wall panel according to claim 1, characterized in that, The insulation layer is obtained by polyurethane foaming.

9. A method for preparing a 3D-printed sandwich insulation wall panel as described in any one of claims 1 to 8, characterized in that, Includes the following steps: (A1) Generate three-dimensional data based on the design model, and print the first mold shell, the reinforcing mesh that matches the first mold shell, the connectors, the second mold shell, and the reinforcing mesh that matches the second mold shell; (A2) Pour concrete in the first formwork, then flip it over and pour concrete in the second formwork. (A3) Polyurethane is foamed in the cavity between the first mold shell and the second mold shell to form an insulation layer, resulting in a 3D printed sandwich insulation wall panel. or, (B1) Generate 3D data based on the design model, and print the first mold shell, connectors and the second mold shell; (B2) Fill the first mold shell with UHPC, flip it over and fill the second mold shell with UHPC; (B3) Polyurethane is foamed in the cavity between the first mold shell and the second mold shell to form an insulation layer, resulting in a 3D printed sandwich insulation wall panel.

10. An application of a 3D-printed sandwich insulation wall panel as described in any one of claims 1 to 8 in the field of building engineering.

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