Threaded Sleeve Clamping for Crack-Resistant Concrete Joining
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Solution Overview
Problem
Conventional methods for joining and reinforcing concrete components are inadequate in distributing loads uniformly and preventing cracks, as they only develop their effect when a crack forms, whereas the system described generates bond stress pre-emptively to absorb forces before cracking occurs.
Innovation Solution
The system comprises threaded sleeves with external threads that are axially clamped using an elongate clamping element, generating opposed bond stresses across the component's length, and can include a grooving tip for thread formation, with an elastic element for precise clamping, to distribute loads uniformly and prevent crack formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional reinforcement methods (steel rods) are used to reinforce concrete components, then tensile strength is improved, but the reinforcement only develops its effect when a crack forms, failing to prevent crack formation
Solution Approach 1:
The threaded sleeve system performs preliminary action by generating bond stress pre-emptively before cracking occurs. The threaded sleeves are installed and clamped to create opposing bond stresses in the concrete component, establishing a stress field that actively counteracts tensile forces before they can cause cracks. This is in contrast to conventional reinforcement that remains inactive until cracks form.
2Strength
If conventional joining methods (screws in apertures) are used to join concrete components, then components can be connected, but load distribution is inadequate and uniform load distribution cannot be achieved
Solution Approach 1:
The joining system divides the load distribution function into multiple threaded sleeves distributed across the joining interface. Instead of concentrating loads at discrete screw points, the threaded sleeves create a distributed pattern of bond stresses along the interface, segmenting the load path to achieve more uniform stress distribution across the joined components.
Solution Approach 2:
The threaded sleeve system applies local quality by creating concentrated bond stress zones at specific locations where the threaded sleeves are installed. Each threaded sleeve generates localized opposing bond stresses in the concrete, allowing precise control of stress distribution patterns to optimize load transfer at critical locations while maintaining overall uniformity.
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 system effectively reinforces concrete components by generating bond stress pre-emptively, increasing stability and load-bearing capacity, and preventing crack formation under tensile loads, unlike conventional reinforcements which only act after cracking begins.
Implementation Method 1
an external thread, with the aid of which the threaded sleeve can be screwed into the respective component and which is suitable for the formation of a composite with the respective component
Implementation Method 2
The threaded sleeves are axially clamped, typically under tension by means of the clamping element, so that the threaded sleeves generate an opposed bond stress in the respective component via their respective external threads
Implementation Method 3
an elastic element, in particular a tension spring or a compression spring
Data Source
AI summary
The invention relates to a system for joining two components or for reinforcing a component, comprising a first and a second threaded sleeve which each comprise the following: an outer thread, with the aid of which the threaded sleeve can be screwed into the respective component and which is suitable to form a composite with the respective component, and a power drive, by which a torque for screwing the threaded sleeve into the respective component can be transmitted to the threaded sleeve. The system further comprises an elongate clamping element which is suitable to be guided through the second threaded sleeve and introduced into or guided through the first threaded sleeve, and which is suitable to axially clamp the first and the second threaded sleeve in such a manner that the first and the second threaded sleeve form opposed composite stresses in the respective component.