Concealed Mounting Plate for Roof Paver Crane Deployment
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Solution Overview
Problem
Existing methods for lifting large or awkward items to high-rise building roof patios or balconies require cumbersome and time-consuming disassembly and reassembly of modular cranes, which are not practical for frequent use and disrupt the aesthetic of the paver stone surfaces.
Innovation Solution
A concealed metal plate assembly is permanently attached to the concrete roof slab, allowing for the installation of a davit or jib crane with hidden mounting points beneath the paver stones, enabling quick deployment and storage of the crane without visible disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If modular cranes are used for lifting items to the roof patio, then the lifting function is achieved, but the disassembly and reassembly process is time-consuming and cumbersome
Solution Approach 1:
The patent applies preliminary action by pre-installing permanent hard points during the initial construction phase of the building. These hard points remain in place permanently, eliminating the need for repeated disassembly and reassembly of modular cranes. The hard points are prepared in advance and simply require the crane base to be bolted on when needed, dramatically reducing deployment time and effort.
2Ease of operation
If hard points are exposed on the paver stone surface, then crane mounting is simplified, but the aesthetic appearance of the paver stone finish is disrupted
Solution Approach 1:
The patent applies the extraction principle by removing the visible portion of the hard points from the paver stone surface. The hard points are embedded below the surface level, with only the necessary mounting interface exposed. This separates the aesthetic surface layer from the functional mounting feature, allowing the paver stones to maintain their continuous, unbroken appearance while still providing secure crane attachment points when needed.
3Productivity
If permanent hard points are installed on the roof slab, then crane deployment is quick and easy, but the structural integrity of the roof slab must be compromised
Solution Approach 1:
The patent applies preliminary action by installing the hard points during the initial construction phase when the concrete roof slab is still curing and malleable. Rebar is embedded in the wet concrete to create structurally integrated hard points that become part of the slab's reinforcement system. This preliminary installation during construction ensures the hard points are as structurally sound as the slab itself, maintaining structural integrity while enabling quick crane deployment later.
Data Source
AI summary
A method for installing and deploying concealed mounting points for a davit or jib crane on a roof patio or large balcony covered with stone pavers. Specifically, a metal plate assembly lower flange is affixed to the concrete roof slab with its contact points covered by waterproofing membrane. The metal assembly hard point upper flange holes correspond to the holes in the mounting base of the davit or jib crane. The metal assembly when installed is lower than the pavers supported by metal pedestal transition components. As such, the metal assembly hard point is concealed and covered by a removable cover plate that also sits on top of the metal pedestal transition components and is flush with the top of the pavers.