Modular Truss Frame with Adjustable Diagonal for Manual Assembly
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Solution Overview
Problem
Existing truss frames for bridging and support constructions, such as the Layher Allround bridge girder, are over-dimensioned for span widths of 13 to 20 meters, requiring external mounting and heavy lifting gear due to their weight, making them economically inefficient and difficult to handle manually.
Innovation Solution
The truss frame design incorporates rosettes for connecting scaffolding components, allowing for adjustable length and span options within modular scaffolding dimensions, reducing the weight of individual parts by integrating connecting bodies that enclose the post tubes' circumference, enabling manual assembly without lifting gear and improved force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional truss frames are used for bridging constructions, then structural stability is achieved, but the weight of individual parts becomes too heavy (56 kilograms) requiring lifting gear
Solution Approach 1:
The truss frame is divided into modular components (posts, crossbars, diagonal elements, connecting plates) that can be assembled in different configurations. This segmentation allows optimization of individual part weights while maintaining overall structural integrity through modular design
Solution Approach 2:
The diagonal element incorporates adjustable length means (turnbuckle mechanism with threaded rod) that allows dynamic adjustment of the truss frame's geometry and force distribution, enabling the structure to adapt to different span requirements while using lighter individual components
2Adaptability or versatility
If traditional truss frames are designed for various span widths, then versatility is improved, but the structure becomes over-dimensioned and economically inefficient
Solution Approach 1:
The adjustable diagonal element with turnbuckle mechanism enables continuous length adjustment, allowing the same truss frame design to be adapted to various span widths (13-20 meters and beyond) without requiring different sized components, eliminating over-dimensional design
Solution Approach 2:
The standardized connecting plates with multiple bolt holes and universal connecting elements (rosettes) allow the same basic truss frame configuration to serve multiple span requirements and application types, improving economic efficiency through standardized manufacturing
3Strength
If heavy truss frame components are used to ensure structural stability, then strength is improved, but manual handling becomes difficult requiring lifting gear
Solution Approach 1:
The truss frame is segmented into lighter individual components (posts, crossbars, connecting plates) that can be manually handled and assembled, replacing the need for heavy monolithic structures that require lifting gear
Solution Approach 2:
Connecting plates are pre-welded to post ends during manufacturing, and diagonal elements are pre-assembled with adjustment mechanisms, allowing lighter components to be prepared in advance for easy manual assembly on-site without requiring heavy lifting equipment
4Adaptability or versatility
If connecting elements are added to enable modular scaffolding integration, then adaptability is improved, but device complexity increases
Solution Approach 1:
The connecting plates serve multiple functions: they provide structural connection points for truss frame assembly, integrate with modular scaffolding systems through standardized rosette connections, and accommodate both diagonal and perpendicular member attachments, reducing the need for separate specialized connectors
Solution Approach 2:
The connecting plate design merges the structural connection function with the scaffolding interface function into a single integrated component, combining truss assembly requirements with modular scaffolding compatibility to reduce overall system complexity
Data Source
AI summary
A truss frame for a bridge and/or support includes two elongated, parallel longitudinally-extending post pipes having an outer circumference; two parallel crossbars extending perpendicularly to the post pipes; and a length-adjustable elongated diagonal element. The parts are hingedly and detachably bolted to one other. Two parallel connecting plates secured near each post pipe end extend away from one another on a common, imaginary plane containing the post pipe and crossbar longitudinal axes. Each crossbar and diagonal element has opposite ends hingedly and detachably bolted to a connecting plate. At least two rosettes are welded to each post pipe at a distance from one another corresponding to an integer multiple of a module scaffold modular size. A connecting body is welded to the connecting plate near at least two post pipe ends associated with the same crossbar and surrounds the respective post pipe outer circumference.