Non-welding CFT Column with Bolted Connection and Wave-shaped Plate
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Solution Overview
Problem
Conventional concrete-filled steel tube (CFT) columns face high manufacturing costs due to welding processes, vulnerability to fire due to exposed welding points, and inefficiencies in water and steam pressure management, which affect fire resistance and structural stability.
Innovation Solution
A non-welding type CFT column using a straight bolt connection slot and wave-shaped punching steel plates for efficient steam discharge and water transmission, eliminating the need for welding and enhancing structural integrity and fire resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding process is used to fabricate CFT column, then structural integrity is improved, but manufacturing cost increases and fire resistance decreases
Solution Approach 1:
The steel tube is divided into multiple sections that are connected through bolted end plates rather than welded joints. This segmentation allows for pre-fabrication of components and assembly through mechanical fastening, eliminating the need for on-site welding while maintaining structural integrity through properly designed connection details.
Solution Approach 2:
End plates with bolt holes serve as intermediary elements between steel tube sections. These end plates facilitate mechanical connection through high-strength bolts, providing a reliable connection method that avoids welding while ensuring structural continuity and load transfer between segments.
2Strength
If welding process is used to fabricate CFT column, then structural integrity is improved, but fire resistance decreases due to exposed welding points
Solution Approach 1:
The welding process is completely extracted and removed from the fabrication method. By using bolted connections instead of welding, the harmful exposed welding points that reduce fire resistance are eliminated, while structural integrity is maintained through properly designed mechanical connection details with adequate bolt strength and connection geometry.
3Ease of operation
If conventional connection slot is used, then assembly is simplified, but water and steam pressure management becomes inefficient
Solution Approach 1:
The connection slot is designed with a curved or inclined surface that facilitates natural drainage of water and efficient escape of steam pressure during concrete pouring and curing. This curved geometry guides fluids along a controlled path, preventing water accumulation and steam pressure buildup while maintaining simple assembly through the integrated slot design.
Data Source
AI summary
In the disclosure, the CFT column includes external steel tubes including straight jointing portions in which inclined bolt grooves are formed to be vertically apart from each other and which are formed to extend from an end thereof to cover an overall extension length thereof, a straight bolt connection slot including straight plates connected by a connection bolt to be apart from each other and formed to extend, and configured to integrate the external steel tubes by allowing the connection bolt to be inserted into each of the inclined bolt grooves in which the straight jointing portions of the external steel tubes are in contact with each other and communicate with each other, concrete placed in the integrated external steel tubes and cured, and a wave-shaped punching steel plate.