Latching Assembly for Hollow Metal Log Uplift Resistance
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Solution Overview
Problem
Lightweight building superstructures, particularly those made of hollow metal logs, are susceptible to wind uplift and inertial forces, which can cause detachment during high winds or earthquakes, and conventional tie-down solutions are costly, labor-intensive, and prone to omission by untrained workers.
Innovation Solution
A novel assembly comprising connecting means, latching means, and a hook mechanism that forms a preassembly and final assembly to interconnect building superstructure parts, providing resistance to uplift forces without requiring skilled labor or visible tie-downs, using a springy material for the hook to ensure secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional metal rod tie-downs are used, then uplift resistance is improved, but construction cost and labor time increase
Solution Approach 1:
The tie-down system is segmented into modular corner assemblies that can be independently installed at each building corner. Each assembly includes a U-shaped channel member, latch member, and connector that work together as a complete unit, dividing the complex task of securing the entire building into manageable sections that reduce overall construction complexity.
Solution Approach 2:
The U-shaped channel member serves as an intermediary element that connects the foundation anchor to the wall/logs. This channel member provides a guided path for the latch mechanism and distributes loads across multiple attachment points, simplifying the connection between the foundation and the lightweight superstructure without requiring direct complex anchoring to each log.
2Strength
If conventional metal rod tie-downs are used, then uplift resistance is improved, but installation reliability deteriorates due to worker error
Solution Approach 1:
The U-shaped channel member is pre-installed and secured to the foundation anchors before the walls and logs are erected. This preliminary action establishes the tie-down path and connection points in advance, ensuring that the uplift resistance system is in place before the lightweight superstructure is assembled, eliminating the risk of omitted tie-downs during later construction phases.
Solution Approach 2:
The latch member is designed to automatically engage with the U-shaped channel member through a simple manual operation that provides visual confirmation of proper installation. The self-latching mechanism ensures that each corner assembly is properly secured without requiring skilled workers to perform complex installation procedures or remember specific installation steps.
3Productivity
If hollow metal logs are used, then construction cost and speed are improved, but uplift susceptibility worsens
Solution Approach 1:
The U-shaped channel member with latch mechanism creates a mechanical counteraction to uplift forces. The latch member engages with the channel to provide a downward restraining force that counterbalances the upward wind loads, effectively neutralizing the susceptibility of the lightweight hollow metal log structure to uplift without adding significant weight to the individual logs.
Solution Approach 2:
The tie-down system merges multiple functions into a single integrated assembly: the U-shaped channel member provides both the anchoring interface and the guidance path, while the latch member simultaneously provides the restraining force and visual installation confirmation. This merged assembly simplifies the connection of lightweight hollow metal logs to the foundation while maintaining uplift resistance.
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
Enables rapid, inexpensive construction of lightweight building superstructures resistant to uplift forces, ensuring that the tie-down function is always engaged, even with unskilled labor, thereby preventing structural damage from wind or seismic events.
Implementation Method 1
The latching means is formed of a springy material
Implementation Method 2
wind can produce a Bernoulli Effect causing air pressure above the roof of a building to be less than the air pressure within the building and generating a dangerous uplift
Data Source
AI summary
An assembly comprises a first connector attached to a first hollow metal log of a building superstructure; a latch; and a second connector attached to a second hollow metal log of the superstructure. The first connector comprises a slot for receiving a projecting flange of the latch, and the second connector comprises an opening adapted to receive a cam portion of the latch. The projecting flange can be pre-engaged with the slot to form a preassembly. The engagement of the cam with the opening formed in the second connector then forms a final assembly wherein the first connector, the latch, and the second connector are latched together so that the first and second logs are interconnected and made resistant to wind uplift.