A method for producing assembled building composite slabs using 3D printing technology

Abstract

The present invention provides a method for producing a composite slab of an assembled building by using 3D printing technology. The composite slab includes a composite slab edge mold and internal concrete located within the composite slab edge mold, and comprises: S1. According to the dimension information of the composite slab to be produced, converting the dimension information into mold dimension information and inputting the converted mold dimension information into a 3D printing device; S2. Using 3D printing technology and combining with the input mold dimension information, printing out the composite slab edge mold; S3. After the composite slab edge mold is printed, constructing internal concrete within the composite slab edge mold to obtain the composite slab. By using 3D printing technology to produce the composite slab of the assembled building, the present invention can achieve customizable production, and the 3D printing technology greatly reduces the cost of the mold and improves the automation degree of the production process, providing a feasible technical solution for the automation, customization, and flexibility of the composite slab production.

Description

Technical Field

[0001] The present invention relates to the field of production of prefabricated components for assembled buildings, and particularly relates to a method for producing a composite slab for an assembled building by using 3D printing technology. Background Art

[0002] Currently, in the production of composite slabs for assembled buildings, the production forms of assembling molds, pouring production, and removing the molds after reaching the demolding strength are generally adopted at home and abroad. In this traditional production method, on the one hand, the relevant side molds are mainly steel molds. Once the molds are determined, it is difficult to make changes for different projects, and there is a problem that the molds are difficult to be universal and are discarded after changing projects, which increases the mold cost and restricts the customization and flexibility of production; on the other hand, in the production of composite slabs, the assembly and disassembly of side molds require a large amount of manual participation, and problems such as noise and solid waste are not environmentally friendly, which does not meet the development requirements of automation and greenness in the production of prefabricated components for assembled buildings.

[0003] Meanwhile, the concrete 3D printing technology is booming. This technology has the characteristics of high automation and customizable production, which is beneficial to solving the above technical problems in the production of composite slabs for assembled buildings. However, the current related research on producing composite slabs for assembled buildings by using concrete 3D printing technology is still blank. Summary of the Invention

[0004] The purpose of the present invention is to solve the above deficiencies and provide a method for producing a composite slab for an assembled building by using 3D printing technology that is convenient for customization, has a low mold cost, and is environmentally friendly.

[0005] In order to solve the above technical problems, the present invention adopts the following technical scheme: A method for producing a composite slab for an assembled building by using 3D printing technology. The composite slab includes a composite slab side mold and internal concrete located within the composite slab side mold, and the method includes the following steps:

[0006] S1. According to the size information of the composite slab to be produced, convert it into mold size information, and input the converted mold size information into a 3D printing device;

[0007] S2. Use 3D printing technology, combined with the input mold size information, to print out the composite slab side mold;

[0008] S3. After the composite slab side mold is printed, construct internal concrete within the composite slab side mold to obtain the composite slab.

[0009] Further, in the step S2, the printed composite slab side mold is a non-removable side mold.

[0010] Further, in the step S2, the side form of the composite slab is produced by layer-by-layer stacking and printing in the way of concrete 3D printing. After one layer of printing is completed, an interface strengthening agent is applied to the surface of this layer.

[0011] Further, the interface strengthening agent includes, by weight, 1-2 parts of nano-silica, 5-10 parts of α-type hemihydrate gypsum whiskers, 20-30 parts of anhydrous gypsum whiskers, and 100-150 parts of water.

[0012] Further, in the step S3, the method for constructing the composite slab specifically includes the following steps:

[0013] S3.1. Conduct a strength test on the printed side form of the composite slab. When the strength of the side form of the composite slab reaches above 5 MPa, install the steel mesh, truss bars, and embedded parts inside the side form of the composite slab;

[0014] S3.2. When the strength of the side form of the composite slab reaches above 10 MPa, inspect the installed steel mesh, truss bars, and embedded parts to ensure that the inspection of the steel mesh, truss bars, and embedded parts is qualified;

[0015] S3.3. Construct the internal concrete inside the side form of the composite slab;

[0016] S3.4. Conduct pre-curing and curing on the side form of the composite slab after constructing the internal concrete in the step S3.3 to obtain the composite slab.

[0017] Further, the thickness of the side form of the composite slab is the same as the thickness of the composite slab to be produced.

[0018] Preferably, the thickness of the side form of the composite slab is 30-100 mm.

[0019] Further, in the step S2, both the inner and outer surfaces of the printed side form of the composite slab are rough surfaces.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention uses 3D printing technology to produce the precast building composite slab, which can achieve customizable production. Moreover, the 3D printing technology greatly reduces the cost of the mold and improves the automation degree of the production process, providing a feasible technical solution for the automation, customization, and flexibility of the composite slab production;

[0022] 2. The side form of the composite slab obtained by printing in the present invention is used as a part of the composite slab and does not need to be disassembled. Moreover, both the inner and outer surfaces of the side form of the composite slab obtained by 3D printing are rough surfaces, which can be closely combined with the internal concrete, thereby improving the strength of the composite slab. And during the construction process, the composite slab can be closely attached to the externally cast-in-place concrete, thus facilitating the use of the composite slab.

[0023] 3. The present invention produces the side formwork of the composite slab by layer-by-layer stacking and printing using concrete 3D printing, and coats an interface strengthening agent after one layer of printing, so as to improve the strength of the side formwork of the composite slab, which is beneficial to the production of the composite slab. Description of the Drawings

[0024] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 It is a three-dimensional view of the composite slab of the present invention.

[0026] In the figure: 1. Composite slab; 2. Side formwork of the composite slab; 3. Internal concrete; 21. Rough surface. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] Please refer to Figure 1 .

[0029] Embodiment 1:

[0030] A method for producing the prefabricated building composite slab 1 using 3D printing technology, the composite slab 1 including a side formwork 2 of the composite slab and internal concrete 3 located within the side formwork 2 of the composite slab, comprising the following steps:

[0031] S1. According to the dimension information of the composite slab 1 to be produced, convert it into mold dimension information, and input the converted mold dimension information into a 3D printing device;

[0032] S2. Use 3D printing technology to print the side formwork 2 of the composite slab in combination with the input mold dimension information;

[0033] S3. When the side formwork 2 of the composite slab is printed:

[0034] S3.1. Conduct a strength test on the printed side formwork 2 of the composite slab. When the strength of the side formwork 2 of the composite slab reaches 5.7 MPa, install steel mesh, truss bars, and embedded parts inside the side formwork 2 of the composite slab;

[0035] S3.2. When the strength of the side formwork 2 of the composite slab reaches 10.8 MPa, inspect the installed steel mesh, truss bars, and embedded parts to ensure that the inspection of the steel mesh, truss bars, and embedded parts is qualified;

[0036] S3.3. Construct the internal concrete 3 inside the side formwork 2 of the composite slab;

[0037] S3.4. Perform pre-curing and curing on the side formwork 2 of the composite slab after constructing the internal concrete 3 in S3.3 to obtain the composite slab 1.

[0038] In one embodiment, in the S2 step, the printed side formwork 2 of the composite slab is a non-removable side formwork. With this design, by setting the side formwork 2 of the composite slab as a non-removable side formwork, it facilitates the production of the composite slab 1 and solves the technical problems that the assembly and disassembly of the side formwork require a large amount of manual participation and are not environmentally friendly in terms of noise, solid waste, etc.

[0039] In one embodiment, in the S2 step, the side formwork 2 of the composite slab is produced by layer-by-layer stacking and printing in the way of concrete 3D printing. After one layer of printing is completed, an interface strengthening agent is applied to the surface of this layer. With this design, by setting the side formwork 2 of the composite slab as a multi-layer structure and applying the interface strengthening agent between each layer, the strength of the side formwork 2 of the composite slab is enhanced, facilitating the printing of the side formwork 2 of the composite slab.

[0040] In one embodiment, the interface strengthening agent includes 1 part of nano-silica, 5 parts of α-type hemihydrate gypsum whiskers, 20 parts of anhydrous gypsum whiskers, and 100 parts of water by weight. With this design, nano-silica can stimulate the hydration activity of the interface between the lower and upper layers of concrete, and the micro-filling effect can also weaken the porosity of the interface transition zone between the lower and upper layers of concrete, improving the bonding strength;

[0041] The α-type hemihydrate gypsum whiskers and anhydrous gypsum whiskers are combined in a certain ratio. Both types of whiskers can penetrate into the new and old concrete matrices, significantly improving their bonding ability. Among them, the α-type hemihydrate gypsum whiskers have a certain activity and dissolve and recrystallize under the induction of nano-silica. The newly formed fine crystals of calcium sulfate dihydrate can further fill the voids, increasing the interlayer density and improving the interface bonding strength.

[0042] In one embodiment, the thickness of the side formwork 2 of the composite slab is the same as the thickness of the composite slab 1 to be produced. With this design, it is convenient for the construction of the internal concrete 3, so that the side formwork 2 of the composite slab does not need to be disassembled, and the precision of the production of the composite slab 1 is ensured.

[0043] In one embodiment, in the step S2, both the inner and outer surfaces of the printed edge form 2 of the laminated slab are rough surfaces 21. With such a design, since both the inner and outer surfaces of the edge form 2 of the laminated slab are rough surfaces 21, it is convenient for the cooperation between the edge form 2 of the laminated slab and the internal concrete 3, so that the internal concrete 3 closely adheres to the edge form 2 of the laminated slab during pouring, forming an interlocking structure.

[0044] Embodiment 2:

[0045] The difference between this embodiment and Embodiment 1 is as follows:

[0046] S3.1. Perform a strength test on the printed edge form 2 of the laminated slab. When the strength of the edge form 2 of the laminated slab reaches 6.4 MPa, install steel mesh, truss bars, and embedded parts inside the edge form 2 of the laminated slab;

[0047] S3.2. When the strength of the edge form 2 of the laminated slab reaches 11.8 MPa, inspect the installed steel mesh, truss bars, and embedded parts to ensure that the inspection of the steel mesh, truss bars, and embedded parts is qualified.

[0048] The interface enhancer includes, by weight, 1.5 parts of nano-silica, 6 parts of α-type hemihydrate gypsum whiskers, 24 parts of anhydrous gypsum whiskers, and 120 parts of water.

[0049] Embodiment 3:

[0050] The difference between this embodiment and Embodiment 2 is as follows:

[0051] S3.1. Perform a strength test on the printed edge form 2 of the laminated slab. When the strength of the edge form 2 of the laminated slab reaches 7.2 MPa, install steel mesh, truss bars, and embedded parts inside the edge form 2 of the laminated slab;

[0052] S3.2. When the strength of the edge form 2 of the laminated slab reaches 12.3 MPa, inspect the installed steel mesh, truss bars, and embedded parts to ensure that the inspection of the steel mesh, truss bars, and embedded parts is qualified.

[0053] The interface enhancer includes, by weight, 2 parts of nano-silica, 10 parts of α-type hemihydrate gypsum whiskers, 30 parts of anhydrous gypsum whiskers, and 150 parts of water.

[0054] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A method for producing assembled building composite slabs using 3D printing technology, characterized in that: The composite slab (1) includes a composite slab edge form (2) and internal concrete (3) located within the composite slab edge form (2), and comprises the following steps: S1. According to the dimension information of the composite slab (1) to be produced, convert it into mold dimension information, and input the converted mold dimension information into a 3D printing device; S2. Utilize 3D printing technology and combine with the input mold dimension information to print out the composite slab edge form (2); S3. After the composite slab edge form (2) is printed, construct the internal concrete (3) within the composite slab edge form (2) to obtain the composite slab (1); In step S2, the printed composite slab edge form (2) is a non-removable edge form; In step S2, the composite slab edge form (2) is produced by layer-by-layer stacking and printing in the manner of concrete 3D printing. After one layer is printed, an interface enhancer is applied to the surface of this layer; The interface enhancer comprises, by weight parts, 1 - 2 parts of nano-silica, 5 - 10 parts of α-type hemihydrate gypsum whiskers, 20 - 30 parts of anhydrous gypsum whiskers, and 100 - 150 parts of water.

2. The method for producing a composite slab for prefabricated buildings using 3D printing technology according to claim 1, characterized in that: In step S3, the method for constructing the composite slab (1) specifically comprises the following steps: S3.

1. Conduct a strength test on the printed composite slab edge form (2). When the strength of the composite slab edge form (2) reaches above 5 MPa, install steel mesh sheets, truss bars, and embedded parts inside the composite slab edge form (2); S3.

2. When the strength of the composite slab edge form (2) reaches above 10 MPa, inspect the installed steel mesh sheets, truss bars, and embedded parts to ensure that the inspection of the steel mesh sheets, truss bars, and embedded parts is qualified; S3.

3. Construct the internal concrete (3) inside the composite slab edge form (2); S3.

4. Conduct pre-curing and curing on the composite slab edge form (2) after the internal concrete (3) is constructed in step S3.3 to obtain the composite slab (1).

3. The method for producing a prefabricated building composite slab using 3D printing technology according to claim 1, characterized in that: The thickness of the composite slab edge form (2) is the same as the thickness of the composite slab (1) to be produced.

4. The method for producing a composite slab for prefabricated buildings using 3D printing technology according to claim 1, wherein: In step S2, both the inner and outer surfaces of the printed composite slab edge form (2) are rough surfaces (21).

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