Chain Rebar Structure for 3D-Printed Concrete Interlayer Bonding
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Solution Overview
Problem
3D-printed concrete structures face issues with poor bonding strength and toughness at interlayer interfaces, leading to potential delamination, debonding, and safety hazards due to water content and printing intervals.
Innovation Solution
A rebar system with a chain structure and rotatable joints, featuring insertion members that interlock between cement-based slurry layers, enhancing both horizontal and vertical tensile strength through continuous rebar distribution and interlayer bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cement-based slurry is printed layer by layer to form building structures, then construction efficiency and geometric complexity are improved, but interlayer bonding strength deteriorates due to water content and printing time intervals
Solution Approach 1:
The rebar is segmented into multiple sub-parts connected by rotatable joints, allowing the rebar to adapt to the layered structure of 3D-printed concrete while maintaining continuous reinforcement across interlayer interfaces
Solution Approach 2:
The invention combines traditional rebar with rotatable joint mechanisms to create a composite reinforcement system that integrates both mechanical strength and adaptability to curved or angled interlayer interfaces
2Strength
If traditional rebar is used in 3D-printed concrete, then structural strength is improved, but rebar continuity and adaptability to interlayer interfaces deteriorate due to rigid structure
Solution Approach 1:
The rebar incorporates rotatable joints that enable dynamic adjustment of the rebar's configuration, allowing it to adapt to various interlayer angles and maintain optimal positioning for structural reinforcement
Solution Approach 2:
The rotatable joints add a rotational degree of freedom to the rebar system, transitioning from a fixed one-dimensional linear structure to a multi-dimensional adaptable structure that can conform to complex interlayer geometries
3Strength
If rebar is distributed between cement-based slurry layers, then interlayer bonding is improved, but rebar positioning precision and distribution uniformity deteriorate due to manual placement
Solution Approach 1:
The modular rebar design with standardized connection interfaces enables self-positioning and self-alignment during the printing process, reducing the need for precise manual placement while maintaining distribution uniformity
Data Source
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AI summary
The present application relates to the technical field of engineering construction and provides a rebar, a device and a construction method for 3D-printing a concrete interlayer structure. The rebar at least comprises: a body in the form of a chain structure, comprising a plurality of sub-parts mutually spliced, wherein the body is adapted for being sandwiched between two adjacent upper and lower cement-based slurry layers; a rotatable joint arranged between two adjacent sub-parts in such a way that the two adjacent sub-parts are rotatably connected to each other; insertion members, wherein both sides of each of the sub-parts are provided with the insertion members extending away from the center of each of the sub-parts, wherein the insertion member on one side of each of the sub-parts is adapted for being inserted in an upper cement-based slurry layer, and the insertion member on an opposite side of each of the sub-parts is adapted for being inserted in a lower cement-based slurry layer. In summary, the rebar can simultaneously enhance the bearing capacity of the printed structure both in the horizontal direction and in the vertical direction, improve the overall connection strength of the printed structure, so that the building structure is not prone to damage or collapse, which is conducive to reducing any potential safety hazard.