Threaded Rebar Anchoring Head for Congestion-Free Beam Joints
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Solution Overview
Problem
Conventional rebar hook anchoring methods in reinforced concrete structures lead to increased material costs, congestion, and construction complexities, particularly at beam-column joints, affecting the quality of concrete pouring and increasing labor costs due to the need for longer rebar lengths and complex configurations.
Innovation Solution
A rebar anchoring system featuring an external thread on the rebar and an anchoring head with internal threads, combined with a bolt that applies axial pressure to the rebar, providing a secure and cost-effective anchoring solution that can be easily assembled and inspected for proper tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rebar hook anchoring method is used, then rebar can be anchored to concrete, but rebar length increases and material cost increases
Solution Approach 1:
The anchoring function is segmented into two parts: the rebar itself and a separate anchoring head component. The rebar ends are threaded and the anchoring head is a distinct piece that attaches to the rebar end, allowing the rebar to be shorter while maintaining anchoring capability through the separate head component.
Solution Approach 2:
The anchoring head acts as an intermediary between the rebar and the concrete. Instead of the rebar directly forming a hook that embeds into concrete, the anchoring head with its own anchoring structure serves as a mediator that provides the anchoring function while allowing the rebar to be shorter.
2Reliability
If conventional rebar hook anchoring method is used, then rebar can be anchored to concrete, but rebar congestion increases at beam-column joints
Solution Approach 1:
By separating the anchoring function into a distinct anchoring head component, the rebar configuration becomes simpler. The rebar itself remains straight or minimally bent, while the complex anchoring geometry is contained in the separate head component, reducing congestion at beam-column joints.
3Reliability
If conventional rebar hook anchoring method is used, then rebar can be anchored to concrete, but concrete pouring quality deteriorates due to rebar congestion
Solution Approach 1:
The segmentation of the anchoring function into a separate head component reduces rebar congestion, thereby improving concrete pouring quality. The simplified rebar configuration allows concrete to flow more freely during pouring while the anchoring head provides the necessary anchoring reliability.
4Length of moving object
If enlarged-head rebar is used to replace traditional hook, then rebar embedded length decreases and material cost reduces, but anchoring firmness needs to be maintained
Solution Approach 1:
The anchoring mechanism transitions from relying on rebar embedment length to relying on the anchoring head's threaded connection and bolt pretensioning. The parameters of anchoring firmness are changed from being dependent on embedded length to being dependent on thread engagement and bolt tension, allowing shorter rebar while maintaining firmness.
Solution Approach 2:
The anchoring head serves as an intermediary that provides the anchoring firmness through its threaded connection to the rebar and its connection to the concrete. This mediator allows the rebar to be shorter while maintaining the necessary anchoring firmness through the head's design.
5Productivity
If precast construction method is used, then construction period decreases and productivity increases, but labor cost increases due to aging population
Solution Approach 1:
The anchoring head and rebar are prepared in advance as pre-assembled units with threaded connections. This preliminary preparation allows for faster on-site assembly in precast construction, maintaining the productivity benefits while reducing the complexity of on-site work and potentially reducing labor costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces rebar congestion, lowers material costs, improves concrete pouring quality, and simplifies construction by allowing for shorter rebar lengths and more flexible configurations, while ensuring strong anchoring through pretensioning and easy verification of bolt tension.
Implementation Method 1
applying a torque to the bolt so that the screw rod continuing to exert a longitudinal pressure on the end of the rebar
Implementation Method 2
so that the anchoring head exerting a longitudinal tension on the rebar for the anchoring head and the rebar to mutually fix
Implementation Method 3
the inner side of the first perforation being formed with a first internal thread matching with the external thread of the rebar
Implementation Method 4
applying a torque to the bolt so that the screw rod continuing to exert a longitudinal pressure on the end of the rebar
Implementation Method 5
grouting by pouring mixed concrete water into the rebar structure so that the anchoring head being anchored when the concrete dried and hardening
Data Source
AI summary
A rebar anchoring system and method are provided. The system includes: a rebar, with an external thread formed on the periphery of at least one end; an anchoring head, with a first perforation and a second perforation disposed respectively at both ends extending axially into the anchoring head and communicating with each other, the inner sides of the first and second perforations being formed respectively with a first internal thread matching with the external thread of the rebar and a second internal thread, and the anchoring head being mounted on the end of the rebar through the first internal thread and the external thread of the rebar; and a bolt, having a screw rod matching with the second internal thread, the screw rod being locked into the second perforation of the anchoring head, and the end of the screw rod pressing against the end of the rebar.