T-Bracket Fastening System for Shipping Container Structural Rigidity
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Solution Overview
Problem
The challenge in constructing structures from repurposed shipping containers lies in maintaining structural integrity when creating large open spaces, as cutting the steel skin reduces strength, and existing reinforcement methods are costly, labor-intensive, or aesthetically undesirable, particularly when stacking multiple containers.
Innovation Solution
A fastening system using T-brackets with horizontal cap plates and vertical spine plates is employed to join longitudinal bars from adjacent containers, creating a unified beam structure that enhances rigidity without significant additional material or on-site engineering, allowing for efficient stacking and access to fastening points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If webbing joining the top rail of the lower floor with the bottom rail of the top floor is added to create a compound beam, then structural rigidity is improved, but the joint location becomes inaccessible when multiple containers are stacked
Solution Approach 1:
The fastening system is divided into modular components: a T-bracket with horizontal and vertical arms, extending plates attached to container rails, and fasteners. This segmentation allows each component to be independently positioned and installed, enabling workers to access and install components from the top of stacked containers without needing side access to joint locations.
Solution Approach 2:
The fastening system transitions from a traditional side-access webbing connection to a top-down installation approach. The T-bracket extends vertically between containers while horizontal arms connect to rails, allowing installation from the vertical dimension (top of stacked containers) rather than requiring horizontal access at joint locations.
2Strength
If larger structural beams are added to reinforce spans, then structural strength is improved, but cost and interior ceiling height are reduced
Solution Approach 1:
The fastening system merges the structural functions of multiple components: the T-bracket vertical arm, horizontal arms, extending plates, and fasteners work together as an integrated system. This combination creates a compound beam effect that reinforces spans without requiring single large structural beams, thereby reducing cost and preserving ceiling height.
Solution Approach 2:
The fastening system creates a composite structural system by combining the container's existing rails with the T-bracket steel components. This composite approach distributes structural loads across multiple elements rather than relying on a single large beam, reducing material costs and maintaining interior height while achieving the required structural strength.
3Ease of operation
If access holes are cut at every joint location to allow workers to access rails for adding reinforcing steel webbing, then accessibility is improved, but time consumption and cost increase
Solution Approach 1:
The extending plates are pre-attached to the container rails before stacking, and the T-bracket components are designed to be installed from the top down. This preliminary preparation and top-down installation approach eliminates the need for access holes, as all fastening operations can be performed from the accessible top surface of stacked containers.
Solution Approach 2:
Instead of cutting access holes in the container sides to reach joint locations from the outside, the fastening system inverts the approach by installing all components from the top surface of stacked containers. The T-bracket descends vertically into position, and fasteners are installed from above, completely eliminating the need for side access holes.
4Length of stationary object
If the bottom rail is used to span large open spaces, then structural coverage is improved, but deflection exceeds building code requirements
Solution Approach 1:
The T-bracket vertical arm acts as a counter-support element that opposes the downward deflection of the bottom rail span. By connecting the top rail of the lower container to the bottom rail of the upper container, the system creates an upward counteracting force that reduces net deflection, allowing longer spans to meet building code requirements.
Data Source
AI summary
A bracket system creates a cost-effective way to build large clear spans in shipping container structures. The system efficiently joins four shipping containers along the longitudinal corner edges, with the containers set adjacent one another, to create a compound beam made by combining or coupling both top rails of the two lower containers and bottom rails of the top containers. A single T-bracket mounts onto pre-installed angle brackets on the raised containers, and a fastener is set through the lower plate to the T-bar joining the lower containers. The bracket system may be iterative and used to combine multiple pairs, or single, containers on top of or beside the initial set.