Ground-Level Roofing Assembly Gantry for Safer Roof Installation

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Solution Overview

Problem

The roofing industry faces high accident risks and reduced efficiency due to the need for multiple workers on the roof, where they interact with heavy materials and dangerous heights, despite safety measures like harnesses, which slow the installation process.

Innovation Solution

A system comprising a center frame with cantilevered girders and outrigger beams allows assembly of roofing components at ground level, using adjustable-length frames and wheeled base frames, enabling simultaneous construction of two mirrored assembly sides, with minimal workers required on the roof for final placement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple workers are placed on the roof to work quickly, then productivity increases, but the risk of accidents increases

Engineering Contradiction:

Improveroof installation speedVSAvoidaccident risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The roof assembly is divided into modular sections that can be constructed separately at ground level using the gantry system. Each module includes pre-assembled joists, sheathing, and roofing materials that are manufactured on the ground and then lifted into position, eliminating the need for multiple workers to simultaneously occupy dangerous roof spaces while maintaining production throughput through parallel module fabrication

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A ground-based gantry system serves as an intermediary mechanism between ground-level workers and the roof structure. The gantry provides a stable, ground-supported platform for assembling roof modules, eliminating the need for workers to directly access the roof during construction. This intermediary structure transfers the assembly function from the dangerous roof environment to a safe ground-level operation

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If safety measures such as harnesses are implemented, then accident risk is reduced, but installation efficiency decreases

Engineering Contradiction:

Improveworker safetyVSAvoidinstallation speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Safety-related assembly tasks are performed in advance at ground level before modules are lifted to the roof. All welding, fastening, and material securing operations are completed while the module is on the ground-based gantry, eliminating the need for workers to perform these tasks on the roof and thereby removing the need for continuous safety harness management during critical assembly operations

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The dangerous combination of roof-level work and safety procedure requirements is extracted from the construction process. By relocating all assembly operations to the ground-based gantry system, the patent separates the assembly function from the elevated roof environment, thereby eliminating the inherent conflict between safety protocol compliance and installation speed

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of operation

If equipment is hoisted to workers on the roof, then material delivery is enabled, but dangerous interactions between equipment and workers occur

Engineering Contradiction:

Improvematerial deliveryVSAvoidequipment-worker interaction risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Instead of lifting equipment and materials up to workers on the roof, the system inverts the sequence by assembling complete roof modules at ground level and then lifting the finished modules as single units. This reversal eliminates the need for equipment and workers to interact in the dangerous zone between the ground and roof, as all material handling occurs before the module reaches elevated position

Inventive Principle:

Principle #13The other way round (Inversion)

4Reliability

If workers secure safety straps while relocating on the roof, then safety is maintained, but time is lost reducing efficiency

Engineering Contradiction:

Improveworker safetyVSAvoidsafety procedure time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

All safety-critical securing operations are performed preliminarily at ground level before modules are elevated. Workers complete all fastening, welding, and material attachment tasks while standing on the stable ground-based gantry, eliminating the need to perform these time-consuming safety procedures during roof-level installation activities

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12516527B2System and method of assembling and installing commercial roofing

Publication Date: 2026.01.06 INNOVATECH SYSTEMS LLC

AI summary

A system for assembling roofing at ground level has an adjustable-length center frame separating a first assembly side from a second assembly side; a first cantilevered gantry on the first assembly side and a second cantilevered gantry on a second side, each cantilevered gantry moveable along the length of the center frame; a plurality of outrigger beams coupled to opposing ends of the center beam, each outrigger beam having a catwalk thereon; a first joist railing and a second joist railing on each assembly side, each joist railing configured to receive an end of an open web joist; and a base frame comprising a plurality of wheels. Once the roofing section has been assembled, hoisting the assembled roofing section to the top of a structure.