Construction method for spatial aggregate reinforced 3D printed concrete structure

Patent metadata

Field	Value
Publication number	US-12233571-B2
Application number	US-202017769750-A
Country	US
Kind code	B2
Filing date	Oct 16, 2020
Priority date	Oct 21, 2019
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A construction method for a spatial aggregate reinforced 3D printed concrete structure, includes: selecting a structural member, performing mechanical analysis, and determining a basic dosage and a printing and weaving process of an implanted reinforcement, determining a type, positioning and dosage of a spatial aggregate, preparing 3D printing materials, editing an electromagnetic signal and positioning push program according to the selected positioning and dosage of the spatial rigid aggregate, the 3D printing material is extruded along the printing and weaving process and the spatial rigid aggregate is evenly scattered, and realizing the connection between spatial aggregates and the connection between the spatial aggregates and the reinforcements, a spatial aggregate reinforced 3D printed concrete structure is formed after layer-by-layer construction, superimposed and hardened, or after segmented printing, component nodes are connected through lap design of preset tenon and mortise and reinforcement.

First claim

The invention claimed is:

1. A construction method of spatial aggregate reinforced 3D printed concrete structure, wherein, the construction method comprises the following steps:
(1) selecting a structural member, performing mechanical analysis, and determining a basic dosage and a printing and weaving process of an implanted reinforcement or braided rope/wire material according to a stress distribution and size under an ultimate bearing capacity of the structural member;
(2) determining a type, position and dosage of a spatial aggregate according to a stress distribution and size under a normal bearing capacity of the structural member, wherein the spatial aggregate is a spatial rigid aggregate composed of biomimetic structures formed by aggregates of different shapes, the aggregate has a multi-limb structure in space, the tail of the aggregate is provided with snaps and end anchors for linking between the spatial aggregates, and the center of the spatial aggregate is provided with a clasp for socketing with reinforcement rebar or rope/wire;
(3) preparing 3D printing materials, and editing an electromagnetic signal and positioning push program of the spatial rigid aggregate according to the selected positioning and dosage of the spatial rigid aggregate; and
(4) extruding the 3D printing material along the printing and weaving process in step (1), and while the reinforcement being implanted or the rope/wire being woven into the space, evenly scattering the spatial rigid aggregate; using the electromagnetic signal and positioning push program in step (3) to realize the connection between spatial aggregates and the connection between the spatial aggregates and the reinforcements rebar or ropes/wires respectively; forming a spatial aggregate reinforced 3D printed concrete structure at one time after layer-by-layer construction, superimposed and hardened, or after segmented printing, connecting component nodes through lap design of preset tenon and mortise and reinforcement rebar or rope/wire to form the spatial aggregate reinforced 3D printed concrete structure;
wherein, in step (2), a method of determining a type, positioning and dosage of a spatial aggregate according to a stress distribution and size under a normal bearing capacity of the structural member is as follows:
(2-1) selecting the type of spatial aggregate according to a distribution of shear stress, selecting design parameters of end anchors and snaps in the tail according to the value of shear stress, and determining the number of limbs of the spatial aggregate according to the anisotropy of the shear stress, wherein the design parameters of the end anchor comprise lengths and widths of the tips of the end anchors;
(2-2) designing the dosage of the spatial rigid aggregate according to a safety factor determined by a ratio of principal stress/material strength, and locating the spatial aggregate according to the incorporation region and the shape of the structural member; and
(2-3) determining an encryption area of the spatial aggregate according to a size and regional distribution of the safety factor and the threshold value, and determining the threshold value according to an actual working condition.

2. The construction method of spatial aggregate reinforced 3D printed concrete structure according to claim 1 , wherein, in step (2), the biomimetic structure formed by the aggregate is one or a combination of at least two of biomimetic structures of quinoa, cocklebur or sea urchin.

3. The construction method of spatial aggregate reinforced 3D printed concrete structure according to claim 2 , wherein, the material of the aggregate is selected from one or combination of at least two of steel, alloy, fiber composite material or nano-rigid material; the shape of the tail of the aggregate is selected from one or a combination of at least two of milling type, corrugation, bow type or tail hook.

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

5. The construction method of spatial aggregate reinforced 3D printed concrete structure according to claim 1 , wherein, in step (3), the 3D printing material further includes a reinforcing component selected from one or a combination of at least two of various types of fibers and their polymers, expanded microbeads, hollow particles or nanomaterials.

6. The construction method of spatial aggregate reinforced 3D printed concrete structure according to claim 1 , wherein, in step (4), a method of implanting reinforcement or waving rope/wire is: in the parallel printing direction, the implanting reinforcement or waving rope/wire is integrated into the 3D printing material when printing the substrate; in the vertical printing direction, implanting reinforcement or weaving rope/wire before the initial setting of the printing material after 3D printing the substrate, forming a spatial reinforced grid.

7. The construction method of spatial aggregate reinforced 3D printed concrete structure according to claim 1 , wherein, the materials of the reinforcement or rope/wire are selected from one or a combination of at least two of steel strands, fiber composite wires or nanowires.

Assignees

• Univ Zhejiang

Inventors

• Sun Xiaoyan
• Wang Hailong
• Ye Baixing
• Chen Long
• Zhang Zhicheng

Classifications

• B28B23/022

  Means for inserting reinforcing members into the mould or for supporting them in the mould (inserting during extrusion B28B3/2645) · CPC title

• B28B1/522

  for producing multi-layered articles (B28B1/526, B28B1/527 take precedence) · CPC title

• B33Y70/00

  Materials specially adapted for additive manufacturing · CPC title

• B33Y50/02

  for controlling or regulating additive manufacturing processes · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title