Post-Tension Modular Connection Assembly for Seismic Stability
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Solution Overview
Problem
Modular construction units face challenges in seismic zones due to the difficulty in achieving the right balance of rigidity and flexibility economically, with existing connection systems failing structurally and being costly, especially when requiring external bracing or traditional welding.
Innovation Solution
A vertical post-tensioned structural connection system that allows modular units to be stacked without on-site welding, using a uniquely designed 'pin' for post-tensioning and adjustable rod connections between units, enabling self-supporting structures up to 6 stories and reducing horizontal connections to simple tie connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional steel welding is used to connect modular units on-site, then structural connection is achieved, but construction cost and time increase significantly
Solution Approach 1:
The connection components (plates, bolts, and alignment features) are pre-assembled and prepared off-site before delivery to the construction site. This preliminary preparation eliminates the need for complex on-site welding operations, allowing modular units to be quickly connected using simple bolted joints and alignment pins, thereby reducing construction time while maintaining structural reliability
Solution Approach 2:
The patent replaces the traditional welding process with a mechanical connection system consisting of pre-fabricated plates, bolts, and alignment features. This mechanical system achieves equivalent structural connection without requiring skilled welders, specialized equipment, or the time-consuming welding process, thus resolving the contradiction between connection reliability and construction speed
2Stability of the object's composition
If external bracing structure is added to bracing modular units in place, then seismic stability is improved, but construction cost and complexity increase
Solution Approach 1:
The patent merges the bracing function directly into the modular unit connections by incorporating diagonal bracing elements and triangular stabilization features within the connection plates and frame assemblies. This integration eliminates the need for separate external bracing structures, reducing overall system complexity while providing the necessary seismic stability through the combined action of the modular units and their inter-connected bracing elements
3Reliability
If modular units are placed far apart to accommodate connection plates, then connection reliability is improved, but real estate space is wasted
Solution Approach 1:
The patent employs nested connection plates and compact bracing elements that fit within the existing footprint of the modular units. The connection plates are designed to attach to the outer surfaces of the units, and the bracing elements are integrated within the connection assemblies, allowing units to be placed close together without wasting valuable building space while maintaining connection reliability through the nested structural elements
4Ease of operation
If existing connection plates are used for vertical post-tensioning, then horizontal connection is achieved, but structural failure occurs after 2-3 stories
Solution Approach 1:
The patent segments the vertical post-tensioning system into discrete, distributed connection points throughout the structure. Instead of relying on a single continuous connection plate that fails after 2-3 stories, the system uses multiple segmented connection assemblies at regular intervals, allowing the structure to distribute and manage tensile forces more effectively, thereby maintaining structural integrity at higher story counts
5Adaptability or versatility
If custom-designed frames are manufactured for each unique project, then site-specific requirements are met, but manufacturing efficiency and scale are reduced
Solution Approach 1:
The patent divides the modular unit design into standardized segments (connection plates, frame components, bracing elements) that can be manufactured using standardized processes. These segmented components are designed with universal interfaces and standardized dimensions, allowing them to be produced in large quantities through efficient manufacturing while still being adaptable to different site conditions through modular configuration and adjustable connection details
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 provides time and cost savings by allowing for higher stacks that can withstand seismic loads without external support, reducing the need for skilled labor and custom-designed units, while maintaining structural integrity and flexibility.
Implementation Method 1
a vertical post-tensioned structural connection system that allows modular units to be stacked without on-site welding, using a uniquely designed 'pin' for post-tensioning
Implementation Method 2
using a uniquely designed 'pin' for post-tensioning... allows construction crews to easily stack the units one on top of the other due to the tapered shape of the pin
Data Source
AI summary
A vertical structural connection assembly allowing a modular construction to be made with a plurality of modular units without any required welding on-site. A pin on top of each column of the modular units allows construction crews to easily stack the units one on top of one another. A cantilever plate is included within the connection assembly which is configured to couple to a cantilever beam, thereby providing a means for a corridor, balcony, overhanging roof, or other construction element to be added to the modular construction. A tie connection attaches on the face of the modular units via a welded bolt or outrigger, and/or placed on adjacent connection assemblies between stacked modular units. The tie connection maintains the horizontal connection while allowing adjacent modular unit to move up and down independently, for example, during a seismic event, while still maintaining a horizontal distance there between.