Non-Slip Rebar Coupler With Sloped Compression Locking
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Solution Overview
Problem
Conventional reinforcing bar couplers face issues with slip when tensile force is applied, are complex to construct, and require additional equipment, leading to safety concerns and delayed construction.
Innovation Solution
A non-slip reinforcing bar coupler design featuring a pipe-shaped body with protrusions, screw threads, insertion holes, a stopper, and a cap with sloping sides, along with a guide member and friction-preventing ring to facilitate easy assembly and prevent slip, enhancing tensile strength and adhesive bonding with concrete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional reinforcing bar coupler is used, then the construction process is simplified, but the coupler breaks at the grasped part due to intensive stress from the tightening spring
Solution Approach 1:
The coupler is divided into a body and a cap that can be assembled separately. The reinforcing bar is inserted into the body first, then the cap is screwed onto the body to apply compression. This segmentation allows the tightening force to be applied gradually and uniformly, preventing sudden stress concentration that causes breakage.
Solution Approach 2:
The reinforcing bar is preliminarily inserted into the body before the cap is tightened. This preliminary positioning ensures proper alignment and distribution of stress, preventing the grasped part from breaking when the tightening spring applies intensive stress.
2Ease of operation
If conventional couplers are used, then assembly is simplified, but slip phenomenon occurs when tensile force is applied to the reinforcing bars
Solution Approach 1:
The inner surface of the cap features a second inner sloping side, and the outer surface of the locker has a first outer sloping side. These curved/sloping surfaces create a wedge effect that converts the rotational tightening motion into axial compression force, firmly pressing the reinforcing bar against the body and preventing slip under tensile load.
Solution Approach 2:
The compression pieces transition from a loose state during assembly to a compressed state when the cap is tightened. This phase transition allows the system to maintain simplicity during assembly while achieving high friction and anti-slip performance under load through the compressed state.
3Strength
If deformed bars are used instead of rounded bars, then adhesive power to concrete and crack control are improved, but the complexity of connection methods increases
Solution Approach 1:
The coupler body has a universal insertion hole that can accommodate both rounded bars and deformed bars. The internal structure with compression pieces and sloping surfaces provides a universal gripping mechanism that works effectively with different bar types, maintaining simplicity while supporting the use of deformed bars for their superior adhesive properties.
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
The coupler ensures secure coupling of reinforcing bars with improved tensile strength and rapid construction, reducing the risk of slip and enhancing the strength of cured reinforced concrete through excellent cementing power.
Implementation Method 1
a first outer sloping side formed on the outer surface of the front of each compression piece to have the same inclination angle as a second inner sloping side of the cap
Implementation Method 2
both the first outer sloping side of the locker and the second inner sloping side of the cap are pressed, so that a plurality of the compression pieces are shrunk
Implementation Method 3
a plurality of spikes respectively protruding from inner wall surfaces of the compression pieces
Implementation Method 4
a pair of first screw threads formed on the outer surface of the body part and at both sides of the protrusion part
Implementation Method 5
a cap body formed on the inner surface of the other side and having a second screw thread screw-coupled with the first screw thread
Implementation Method 6
a friction-preventing ring to prevent generation of friction between the guide member and the body
Data Source
AI summary
Disclosed herein is a non-slip reinforcing bar coupler including: a body which has a body part of a pipe shape, a protrusion part formed in the middle of the body part, a pair of first screw threads formed on the outer surface of the body part and at both sides of the protrusion part, a pair of insertion holes formed at both sides of the body part, and a stopper formed in the middle of the inside of the body part; and a cap which has a cap insertion hole formed at one side, a cap body formed on the inner surface of the other side and having a second screw thread screw-coupled with the first screw thread, and a second inner sloping side formed on the inner surface of the cap insertion hole.