Honeycomb-shaped shear wall structure based on 3D printing and construction method thereof

Abstract

The invention discloses a honeycomb-shaped shear wall structure based on 3D printing and a construction method thereof, belongs to the technical field of building structures, and can solve the problem that in the prior art, effective bond stress between reinforcing steel bars and concrete lacks, and the shear resistance and ductility of a shear wall are affected. The shear wall structure comprises a shell which is formed through 3D printing, a plurality of longitudinally-through cavities are formed in the shell, and the multiple cavities are distributed on the cross section of the shell in a honeycomb shape; the plurality of reinforcing meshes are respectively arranged at different heights in the shell; a plurality of through holes are formed in the reinforcing mesh and are in one-to-one correspondence with the cavities, and each through hole is matched with the corresponding cavity in size; the multiple reinforcement cages are arranged in the multiple cavities in a penetrating mode in a one-to-one correspondence mode; each reinforcement cage is connected with a plurality of reinforcement meshes; the preset functional material is fixed in the plurality of cavities; and the concrete material is filled in vacant areas in the plurality of cavities. The method is used for constructing the honeycomb-shaped shear wall structure.

Description

TECHNICAL FIELD

[0001] The application relates to a 3D printing-based honeycomb-shaped shear wall structure and a construction method thereof, and belongs to the technical field of building structures. BACKGROUND

[0002] With the improvement of the level of building industrialization, 3D printing technology is gradually applied to the manufacturing process of building structure components. In printing a honeycomb-shaped shear wall structure, the prior art needs to first print a shell, the shell has a honeycomb-shaped cavity, and after the shell is printed, a steel cage is inserted into the cavity and concrete is poured to form a shear wall, which can maintain the freedom of printing and at the same time enhance the structural bearing capacity of the shear wall, realizing the composite structure form of 'printed shell + concrete solid core'.

[0003] However, the prior art generally has the following deficiencies: firstly, the steel bars need to be placed in the shell as a whole after the shell is printed, which lacks synchronization with the printing process, resulting in poor positioning accuracy of the steel bars, poor anchoring performance, lack of effective gripping force between the steel bars and the concrete, and affecting the shear resistance and ductility of the shear wall; secondly, no functional material is arranged in the shear wall or only a single functional material is arranged, which cannot meet the needs of buildings in terms of heat insulation, energy storage, damping, self-repairing, intelligent response and the like; thirdly, no connecting structure is arranged on the shell, which is not conducive to the connection and assembly of multiple shear walls, limiting the popularization and application of the shear wall in the prefabricated building system. SUMMARY

[0004] The application provides a 3D printing-based honeycomb-shaped shear wall structure and a construction method thereof, which can solve the problem of lack of effective gripping force between the steel bars and the concrete in the prior art, affecting the shear resistance and ductility of the shear wall.

[0005] In one aspect, the application provides a 3D printing-based honeycomb-shaped shear wall structure, which comprises: a shell formed by 3D printing, having a plurality of longitudinally-through cavities inside, and the plurality of cavities are distributed in a honeycomb shape on the cross section of the shell; a plurality of steel mesh sheets arranged at different heights in the shell; the steel mesh sheet has a plurality of through holes, the plurality of through holes correspond one-to-one to the plurality of cavities, and each through hole is matched in size with the corresponding cavity; a plurality of steel cages corresponding to the plurality of cavities; each steel cage is connected to the plurality of steel mesh sheets; a preset functional material fixed in the plurality of cavities; a concrete material filled in the empty areas in the plurality of cavities.

[0006] Optionally, the steel mesh sheet comprises: A plurality of steel rings are arranged in an array in the transverse direction, and adjacent steel rings are connected to each other; the plurality of steel rings arranged in the array are provided with the plurality of through holes.

[0007] Optionally, the steel mesh further comprises: A plurality of transverse steel bars are arranged at intervals on the plurality of steel rings arranged in the array; each transverse steel bar is connected to the corresponding steel ring.

[0008] Optionally, the steel ring is circular, polygonal or "8" shaped.

[0009] Optionally, the spacing between adjacent steel meshes is equal.

[0010] Optionally, the pre-set functional material is at least one of a mechanical functional material, an electrical functional material, an optical functional material and an energy conversion functional material.

[0011] Optionally, the outer wall of the shell has a connecting structure; a plurality of shells can be connected to each other through the connecting structure.

[0012] Optionally, the concrete material is fiber-reinforced self-compacting concrete.

[0013] In another aspect, the application provides a construction method of any one of the above-mentioned 3D-printed honeycomb-shaped shear wall structures, the construction method comprising: S1, manufacturing a plurality of steel meshes and a plurality of steel cages; S2, using a 3D printing device to print the shell layer by layer; after printing each layer of the shell, laying a steel mesh on the upper surface of the printed shell and continuing to print the next layer of the shell until the shell reaches a pre-set height; S3, curing the printed shell for a first pre-set time; S4, placing the plurality of steel cages one by one into the plurality of cavities of the shell, and connecting each steel cage to the plurality of steel meshes; S5, fixing the pre-set functional material in the plurality of cavities; S6, pouring the concrete material in the vacant areas of the plurality of cavities according to a pre-set condition, and curing the poured concrete material for a second pre-set time.

[0014] Optionally, the pre-set condition comprises a pouring speed less than or equal to 1.5 m / h.

[0015] The beneficial effects that can be produced by the application include: The application improves the mechanical properties of the shell by layering multiple steel mesh sheets in the shell to form an anchoring structure between the steel mesh sheet and the shell, provides anchoring points for the layout of the steel reinforcement cage, improves the layout accuracy of the steel reinforcement cage, and is conducive to improving the gripping force between the steel reinforcement cage and the concrete, thereby enhancing the shear resistance and ductility of the shear wall. At the same time, the steel mesh sheet can be laid synchronously when the shell is printed in layers, and is anchored in the shell layer by layer during the printing process, solving the problem of insufficient steel anchoring caused by the traditional "post-reinforcement" method. On this basis, by embedding the steel reinforcement cage in the honeycomb cavity of the shell, a double steel restraint system of "layered shear skeleton + full-height main force skeleton" is formed, which enhances the interfacial bond strength of the steel and the concrete and reduces stress concentration. At the same time, the restraint system can effectively transfer shear force and disperse bending moment under reciprocating load, thereby significantly improving the overall bearing capacity, seismic ductility and durability of the shear wall. In order to improve the comprehensive performance of the shear wall, different functional materials are arranged in the cavity of the shell according to the actual situation to meet the needs of buildings in terms of heat insulation, energy storage, damping, self-repairing, intelligent response and other aspects. In addition, the application also provides a connecting structure on the shell to facilitate the connection and assembly of multiple shear walls on the construction site, improve the assembly efficiency, and make the 3D printed shear wall widely applicable to the prefabricated building system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structural schematic diagram of a honeycomb-shaped shear wall structure based on 3D printing is provided for the first embodiment of the application. Figure 2 A top view of the Figure 1 provided for the first embodiment of the application. Figure 3 A structural schematic diagram of the shell provided for the first embodiment of the application. Figure 4 A structural schematic diagram of the steel mesh sheet provided for the first embodiment of the application. Figure 5 A layout schematic diagram of the steel mesh sheet provided for the first embodiment of the application. Figure 6 A structural schematic diagram of the "8" shaped steel ring provided for the first embodiment of the application. Figure 7 A structural schematic diagram of the steel reinforcement cage provided for the first embodiment of the application. Figure 8 A layout schematic diagram of the steel mesh sheet and the steel reinforcement cage provided for the first embodiment of the application.

[0017] REFERENCE NUMERALS: 1, shell; 11, cavity; 2, steel mesh sheet; 21, through hole; 22, "8" shaped steel ring; 23, transverse steel bar; 3, steel reinforcement cage. DETAILED DESCRIPTION

[0018] The application will be described in detail below with reference to the embodiments, but the application is not limited to these embodiments.

[0019] An embodiment of the application provides a honeycomb-shaped shear wall structure based on 3D printing, as shown in the figure, the shear wall structure comprises: Figures 1 to 3 a shell 1 formed by 3D printing, which has a plurality of longitudinal cavities 11 inside, and the plurality of cavities 11 are distributed in a honeycomb shape in the cross section of the shell 1; a plurality of steel mesh sheets 2 arranged at different heights in the shell 1; the steel mesh sheet 2 has a plurality of through holes 21, the plurality of through holes 21 correspond to the plurality of cavities 11 one by one, and each through hole 21 is matched in size with the corresponding cavity 11; a plurality of steel cages 3 corresponding to the plurality of cavities 11; each steel cage 3 is connected with the plurality of steel mesh sheets 2; a preset functional material fixed in the plurality of cavities 11; a concrete material filled in the empty areas in the plurality of cavities 11. In the embodiment, the shell 1 can be printed by a special 3D printing concrete material (such as a fiber reinforced cement-based composite material), and the cavities 11 distributed in a honeycomb shape not only provide space for the steel cage 3 and the preset functional material, but also effectively disperse the hardening shrinkage stress of the concrete after pouring, reduce the wall cracks, and thus improve the mechanical properties of the shear wall.

[0020] In the embodiment, as shown in the figure, the spacing between the adjacent steel mesh sheets 2 is equal. For example, the spacing can be 15 cm, 20 cm, 30 cm, etc.

[0021] Figure 5 Specifically, as shown in the figure, each steel mesh sheet 2 comprises: a plurality of steel rings arranged in an array in the transverse direction, and adjacent steel rings are connected with each other; the plurality of steel rings arranged in an array form a plurality of through holes 21, and the size of each through hole 21 is greater than the cross-sectional size of the corresponding cavity 11. The steel ring can be circular, polygonal or "8" shaped.

[0022] Figure 4 a plurality of transverse steel bars 23 arranged at intervals on the plurality of steel rings arranged in an array; each transverse steel bar 23 is connected with the corresponding steel ring. In the embodiment, the "8" shaped steel ring 22 is adopted, as shown in the figure, and the "8" shaped steel ring 22 can be prepared by a steel bending process. As shown in the figure,

[0023]

[0024] Figure 6 Figure 4 ​​​​As shown, a plurality of "8" shaped reinforcing ring 22 are arranged in a row on the horizontal plane and welded to each other, and two transverse reinforcing bars 23 are distributed and welded on both sides of the row of "8" shaped reinforcing ring 22, for strengthening the connection. In practical application, a row of "8" shaped reinforcing ring 22 can be further arranged on the upper surface of the row of "8" shaped reinforcing ring 22, and the inclination directions of the two rows of "8" shaped reinforcing ring 22 are opposite, so that the two rows of "8" shaped reinforcing ring 22 are cross-welded together, which can enhance the strength of the reinforcing mesh 2.

[0025] By layering a plurality of reinforcing mesh 2 in the cavity 11 of the shell 1, an anchoring structure is formed between the reinforcing mesh 2 and the shell 1, which improves the mechanical properties of the shell 1. At the same time, the reinforcing mesh 2 provides anchoring points for the arrangement of the reinforcing cage 3, which improves the arrangement accuracy of the reinforcing cage 3 and is beneficial to improve the gripping force between the reinforcing cage 3 and the concrete, thereby enhancing the shear resistance and ductility of the shear wall.

[0026] As shown in Figure 7 The reinforcing cage 3 can be prefabricated according to the size of the cavity 11 of the shell 1, and the reinforcing cage 3 can be composed of longitudinal reinforcing bars, hoop reinforcement bars, and tie bars, etc., which are adapted to the spatial form of the honeycomb-shaped cavity 11.

[0027] The preset functional material in the first embodiment is at least one of a mechanical functional material, an electrical functional material, an optical functional material, and an energy conversion functional material. The mechanical functional material includes damping shock-absorbing materials (such as lead rubber and viscoelastic materials), the electrical functional material includes intelligent sensing materials (such as carbon fiber sensing wires and piezoelectric ceramic sheets), and the energy conversion functional material includes phase change energy storage materials (such as paraffin-based composite phase change materials) and thermal insulation materials (such as rock wool and aerogel).

[0028] By setting the preset functional material in the cavity 11 of the shell 1, the comprehensive performance of the shear wall can be improved, and different preset functional materials can be set according to the actual situation to meet the needs of buildings in terms of heat insulation, energy storage, damping, self-repairing, intelligent response, etc.

[0029] The preset functional material can be embedded in the cavity 11 in the form of a prefabricated module or precise pouring, and works cooperatively with the reinforcing mesh 2, the reinforcing cage 3, and the concrete material to give the shear wall specific functions such as temperature regulation, energy dissipation and shock absorption, or state monitoring, etc.

[0030] In the first embodiment, the outer wall of the shell 1 has a connecting structure; a plurality of shells 1 can be connected to each other through the connecting structure. The connecting structure can be a prefabricated mortise and tenon type connecting structure, such as a tenon and a groove, or other forms of connecting structure.

[0031] The connecting structure is arranged on the shell 1, so that the multiple shear walls can be connected and assembled on the construction site, the assembling efficiency is improved, and the 3D printed shear wall can be widely applied to the fabricated building system.

[0032] The concrete material is fiber reinforced self-compacting concrete or ordinary concrete, and the fiber reinforced self-compacting concrete is used in the first embodiment. The fiber reinforced self-compacting concrete is poured into the cavity 11, used for filling the gaps around the reinforcement cage 3, the steel mesh 2 and the preset functional material, and used for solidifying the shell 1, the reinforcement cage 3, the steel mesh 2 and the preset functional material into an integrated whole through material bonding and mechanical engagement, so that a composite structure with cooperative stress of each part is formed, and the comprehensive performance of the shear wall is improved.

[0033] The second embodiment of the present application provides a construction method of the above-mentioned any one kind of 3D printed honeycomb-shaped shear wall structure, and the construction method comprises the following steps. S1, multiple steel meshes 2 and multiple reinforcement cages 3 are made.

[0034] S2, a shell 1 with a honeycomb-shaped cavity 11 is printed layer by layer by using a 3D printing device, after each layer of the shell 1 is printed, a steel mesh 2 is arranged on the upper surface of the printed shell 1, and the next layer of the shell 1 is continuously printed, until the shell 1 reaches a preset height.

[0035] S3, the printed shell 1 is cured for a first preset time, the first preset time is 3d-7d, and when the compressive strength reaches more than 70% of the design value (confirmed by detecting the test block under the same condition), the subsequent process can be performed.

[0036] S4, multiple reinforcement cages 3 are correspondingly placed into multiple cavities 11 of the shell 1 by hoisting or other methods, and each reinforcement cage is connected with multiple steel meshes by binding or welding.

[0037] S5, the preset functional material is placed into the cavity 11 and fixed at a suitable position. For example, the thermal insulation material is pasted on the inner wall of the shell 1, and the damping and shock absorption material is fixed in the gap of the reinforcement cage 3, so as to ensure that the preset functional material has no relative displacement with the reinforcement cage 3, the shell 1 and other structures.

[0038] S6, the concrete material is poured into the empty areas of the multiple cavities 11 from the pouring opening reserved at the top of the shell 1 according to the preset condition, and is cured for a second preset time after pouring. The preset condition includes that the pouring speed is less than or equal to 1.5m / h, so as to ensure that the concrete material is filled into all cavities 11 and wrapped around the reinforcement cage 3; the second preset time is 14d-28d. The standard curing time is: 7 days of film covering and moisture retention, 14 days of natural curing, and 28 days of curing until the compressive strength reaches the standard.

[0039] If multiple shear wall structures need to be combined and assembled, the assembly can be performed through the connecting structure on the side wall of the shell 1. Taking the mortise and tenon connecting structure as an example, the tenon of the previous shear wall structure is aligned with the mortise of the subsequent shear wall structure, pressure is applied to make the mortise and tenon tightly engage, if necessary, high-strength grouting material can be injected at the mortise and tenon joint to enhance the connection stiffness, forming an overall lateral force resisting structure, thereby realizing the close connection of multiple shear walls.

[0040] The present application improves the mechanical properties of the shell 1 by layering multiple steel mesh sheets 2 in the shell, forms an anchoring structure between the steel mesh sheet 2 and the shell 1, provides anchoring points for the layout of the steel reinforcement cage 3, improves the layout accuracy of the steel reinforcement cage 3, and is beneficial to improve the gripping force between the steel reinforcement cage 3 and the concrete, thereby enhancing the shear resistance and ductility of the shear wall. At the same time, the steel mesh sheet 2 can be laid at the same time when the shell 1 is layered and printed, and is anchored in the shell 1 layer by layer during the printing process, solving the problem of insufficient steel anchoring caused by the traditional "post-reinforcement" method. On this basis, by embedding the steel reinforcement cage 3 in the honeycomb cavity 11 of the shell 1, a double steel reinforcement constraint system of "layered shear skeleton + full-height main force skeleton" is formed, which enhances the interfacial bond strength of steel and concrete and reduces stress concentration. At the same time, this constraint system can effectively transfer shear force and disperse bending moment under reciprocating load, thereby significantly improving the overall bearing capacity, seismic ductility and durability of the shear wall. In order to improve the comprehensive performance of the shear wall, different functional materials are arranged in the cavity 11 of the shell 1 according to the actual situation to meet the needs of buildings for heat insulation, energy storage, damping, self-repairing, intelligent response and other aspects. In addition, the present application also provides a connecting structure on the shell, which is convenient for connecting and assembling multiple shear walls on the construction site, improves the assembly efficiency, and makes the 3D printed shear wall widely used in prefabricated building systems.

[0041] The above is only a few embodiments of the present application, and does not limit the present application in any form. Although the preferred embodiments are disclosed above, they are not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the disclosed technical content without departing from the scope of the technical solution of the present application, which are equivalent to equivalent embodiments and belong to the scope of the technical solution.

Claims

1. A honeycomb shear wall structure based on 3D printing, characterized in that, The shear wall structure includes: The shell is formed by 3D printing and has multiple longitudinally penetrating cavities inside, which are distributed in a honeycomb pattern on the cross-section of the shell. Multiple steel mesh panels are arranged at different heights within the shell; each steel mesh panel has multiple through holes, each through hole corresponding to one of the multiple cavities, and each through hole matches the size of the corresponding cavity. Multiple steel cages are inserted one-to-one into the multiple cavities; each steel cage is connected to the multiple steel mesh panels. Pre-set functional materials are fixed within the multiple cavities; Concrete material is used to fill the empty areas within the plurality of cavities.

2. The honeycomb shear wall structure based on 3D printing according to claim 1, characterized in that, The steel mesh includes: Multiple reinforcing steel rings are arranged in a transverse array, and adjacent reinforcing steel rings are connected to each other; multiple through holes are formed on the array of reinforcing steel rings.

3. The honeycomb shear wall structure based on 3D printing according to claim 2, characterized in that, The steel mesh also includes: Multiple transverse reinforcing bars are spaced apart on multiple reinforcing bar rings arranged in an array; each transverse reinforcing bar is connected to its corresponding reinforcing bar ring.

4. The honeycomb shear wall structure based on 3D printing according to claim 2, characterized in that, The reinforcing bar ring is circular, polygonal, or figure-eight shaped.

5. The honeycomb shear wall structure based on 3D printing according to claim 1, characterized in that, The spacing between adjacent steel mesh panels is equal.

6. The honeycomb shear wall structure based on 3D printing according to claim 1, characterized in that, The preset functional material is at least one of mechanical functional materials, electrical functional materials, optical functional materials, and energy conversion functional materials.

7. The honeycomb shear wall structure based on 3D printing according to claim 1, characterized in that, The outer wall of the housing has a connecting structure; multiple housings can be connected to each other through the connecting structure.

8. The honeycomb shear wall structure based on 3D printing according to claim 1, characterized in that, The concrete material is fiber-reinforced self-compacting concrete.

9. A construction method for a honeycomb shear wall structure based on 3D printing as described in any one of claims 1 to 8, characterized in that, The construction method includes: S1. Fabricate multiple steel mesh panels and multiple steel cages; S2. Use 3D printing equipment to print the shell layer by layer. After printing each layer of the shell, lay a steel mesh on the upper surface of the printed shell and continue to print the next layer of the shell until the shell reaches the preset height. S3. First preset time for curing the printed casing; S4. Place multiple steel cages into the multiple cavities of the shell one by one, and connect each steel cage to multiple steel mesh sheets. S5. Fix the preset functional materials in multiple cavities; S6. Pour concrete material into the empty areas of multiple cavities according to the preset conditions, and cure for a second preset time after pouring.

10. The construction method according to claim 9, characterized in that, The preset conditions include a pouring speed of less than or equal to 1.5 m / h.

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