Construction method of 3D printing and weaving integrated building

Abstract

The present invention discloses a construction method of 3D printing and weaving integrated building, comprising: selecting basic building structural components, using finite element analysis after spatial modeling, and combining stress nephogram to set a discrimination domain value and optimize a structure space, obtaining a structural component skeleton; calculating and analyzing the structural component skeleton, determining a weaving range and weaving density of a wire according to weak areas and sizes under structural stress; and then determining a printing process and weaving process according to the structural component skeleton, the weaving range and the weaving density; preparing 3D printing material; 3D printing a matrix and weaving the wire according to the printing process and weaving process, constructing layer by layer, or printing segments, and then connecting segments by preset tenoning structural sections to form a 3D printing and weaving integrated building. The construction method of the present invention has high toughness, fatigue resistance, longevity and other advantages; so that each part of the building can not only meet the different requirements of structural mechanics, but also can achieve economic beauty and modeling art on the basis of safety and reliability.

Claims

1. A construction method for a 3D printing and weaving integrated building, comprising the following steps: (1) selecting basic building structural components, using finite element analysis after spatial modeling, and combining stress nephogram to set a discrimination domain value and optimize a structure space, obtaining a structural component skeleton; (2) calculating and analyzing the structural component skeleton, determining a weaving range and weaving density of a wire according to weak areas and sizes under structural stress; and then determining a printing process and weaving process according to the structural component skeleton, the weaving range and the weaving density; (3) preparing 3D printing material; (4) 3D printing a matrix and weaving the wire according to the printing process and weaving process of step (2), constructing layer by layer, stacking hardening and one-time molding to form a 3D printing and weaving integrated building; or printing segments, and then connecting segments by preset tenoning structural sections to form a 3D printing and weaving integrated building; a weaving method of the wire is as follows: in a parallel printing direction, 3D printing matrix is integrated into the wire, injecting screws at weaving location and winding woven wire on the screws; in a vertical printing direction, injecting screws at weaving location after 3D printing matrix, weaving the wire before the 3D printing material is initially set, and the woven wire winding on the injected screws to form a spatial grid.

2. The construction method according to claim 1, wherein, in the step (2), a method of determining a weaving range and weaving density of a wire according to weak areas and sizes under structural stress is as follows: (2-1) determining the weaving range according to a safety factor determined by a stress/strength ratio; (2-2) determining a encrypted weaving range and an ordinary weaving range according to the safety factor and a threshold value, and the threshold value is determined according to an actual value.

3. The construction method according to claim 1, wherein, the step (2) comprises setting a weaving location in the weaving range of the wire for positioning the woven wire.

4. The construction method according to claim 1, wherein, in the step (3), the 3D printing material is selected from one or a combination of at least two of cement-based materials, gypsum materials or nylon materials.

5. The construction method according to claim 1, wherein, in the step (3), the 3D printing material also comprise a reinforcing component, the reinforcing component is selected from one or a combination of at least two of fibers and their polymers, expanded microbeads or hollow particles, and nanomaterials.

6. The construction method according to claim 1, wherein, in the step (4), the wire is selected from one or a combination of at least two of steel strands, fiber composite wires or nanowires.

7. The construction method according to claim 1, wherein, in the step (4), a method of printing segments is as follows: the 3D printing matrix and the wire are segmented printed and prefabricated according to the structural requirements of structural components, and then the tenoning structural sections are printed by post pouring/post tensioning method and used to connect the segments.

8. The construction method according to claim 2, wherein, the step (2) comprises setting a weaving location in the weaving range of the wire for positioning the woven wire.

9. The construction method according to claim 2, wherein, in the step (3), the 3D printing material is selected from one or a combination of at least two of cement-based materials, gypsum materials or nylon materials.

10. The construction method according to claim 2, wherein, in the step (3), the 3D printing material also comprise a reinforcing component, the reinforcing component is selected from one or a combination of at least two of fibers and their polymers, expanded microbeads or hollow particles, and nanomaterials.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic flow diagram of the construction method provided by the present invention;

(2) FIG. 2 is a comparison diagram of multiple schemes of spatial modeling optimization of the bridge structure in the embodiment;

(3) FIG. 3 is a stress distribution diagram in the x direction of the bridge structure provided by scheme b in the embodiment, wherein the stress ranges from ?14.6 to 5.8;

(4) FIG. 4 is a diagram of the main tensile stress distribution of the bridge structure provided by scheme b in the embodiment, wherein the main tensile stress ranges from ?3.6 to 6.4;

(5) FIG. 5 is a flow chart of printing and weaving in an embodiment;

(6) FIG. 6 is a schematic diagram of printing and weaving in the embodiment.

DETAILED DESCRIPTION OF THE INVENTION

(7) The present invention will be further explained below in conjunction with the drawings and embodiments:

(8) As shown in FIG. 1, the construction method of 3D printing and weaving integrated building comprising the following steps: (1) selecting basic building structural components, using finite element analysis after spatial modeling, and combining stress nephogram to set a discrimination domain value and optimize a structure space, obtaining a structural component skeleton; (2) calculating and analyzing the structural component skeleton, determining a weaving range and weaving density of a wire according to weak areas and sizes under structural stress; and then determining a printing process and weaving process according to the structural component skeleton, the weaving range and the weaving density; (3) preparing 3D printing material; (4) 3D printing a matrix and weaving the wire according to the printing process and weaving process of step (2), constructing layer by layer, stacking harding and one-time molding to form a 3D printing and weaving integrated building; or printing segments, and then connecting segments by preset tenoning structural sections to form a 3D printing and weaving integrated building; a weaving method of the wire is as follows: in the parallel printing direction, 3D printing matrix is integrated into the wire, injecting screws at weaving location and winding the woven wire on the screws; in the vertical printing direction, injecting screws at weaving location after 3D printing matrix, weaving the wire before the 3D printing material is initially set, and the woven wire winding on the injected screws to form a spatial grid.

Embodiment

(9) Design space modeling portal arch model as a reference for bridge structure construction.

(10) 1. Determining a structural form and a space shape according to the structural function requirements. Bridges usually choose beam or arch structures as their main stress components. 3D printing cement-based materials usually have high compressive strength and low tensile strength. Selecting the arch structures as the main stress components of the bridge structure can make full use of the material's compressive performance to avoid structural tensile fracture failure.

(11) The spatial modeling and structural forces of the arch structure are selected by structural topology optimization. In order to avoid missing the global optimal solution, two methods or a combination of truss discrete structure and continuum topology can be used. The optimized structure is regularized as shown in FIG. 2, including scheme a and scheme b, which can be used as a preliminary choice for the structure when 3D printing a bridge.

(12) 2. The force transmission path of the second scheme (namely scheme b) of the portal arch shown in FIG. 2 is clearer, and it is chosen as the basic form of the bridge structure for force analysis. According to the stress of the structure under the load level and the uniform stress distribution coefficient as the basis for structural optimization, the spatial layout plan of the continuum/truss composite structure is determined.

(13) The stress distribution of the structure obtained based on the finite element analysis is shown in FIG. 3 and FIG. 4, where the stress in the middle part of the arch ring and the end of the arch is relatively large, which is the area that needs local reinforcement.

(14) 3. Determining a weaving range based on the above calculation results and the structural force threshold value. Specifically, a stress/strength ratio is used to determine a safety factor as the basis for the high-strength wire layout; and a weaving location is preset for the woven wire positioning according to the printing path within the weaving range; a threshold value of an encrypted weaving and an ordinary weaving is set to determine a regional weaving density; a printing process and a weaving process are determined according to the spatial structure type of the bridge, the weaving range and the weaving density. The process flow of printing and weaving is shown in FIG. 5.

(15) 4. The implementation of printing and weaving is shown in FIG. 6. After the 3D printing matrix reaches a preset thickness, the printing and weaving begins. In the parallel printing direction, the wire can be directly integrated into, screws are injected at weaving location to ensure the weaving in place and the wire is properly tensioned when weaving, which is beneficial to the overall force of the printed and woven structure. In the vertical printing direction, the wire can be weaving layer by layer with the help of injected screws, the high-strength wire and 3D printing matrix are solidified, and a spatial grid stress skeleton inside is formed to improve the structure's crack resistance, deformation performance and seismic performance.

(16) Specifically, in this embodiment, according to the set threshold value and the calculated safety factor, in FIG. 6, a is a schematic diagram of the printing direction, where A is a printing starting point, and the arrow direction is a printing direction; b is a schematic diagram of the weaving direction, the arrow direction is a weaving direction, point A is a starting point of weaving, AB, BC, LK, KJ, FG, GH, HI, JK, KL and MA are the encrypted weaving areas, CD, DL, JE, EF, The IJ and LM sections are the ordinary weaving areas; the A-M points are the screws used for positioning that are injected at the weaving location.

(17) 5. An arch is manufactured to form by integrated molding, according to the printing and weaving process and the pre-designed structure model, layer by layer printing and weaving construction. After the components are integrally cured, they can be hoisted and assembled on site to form an integral structure.

(18) In this embodiment, the 3D printing material is a cement-based material, and the wire is a steel strand.

(19) The above-mentioned embodiments are only used to explain the inventive concept of the present invention, but not to limit the protection of the rights of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the essence of the technology and method of the present invention are still valid. It belongs to the scope of the technology and method scheme of the present invention.