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Abstract
Modular unit systems provide an eco-friendly advanced construction method that improves productivity and reduces carbon emissions and construction waste. In these systems, the prefabrication ratio of the modules should be high in order to support these eco-friendly features. The purpose of this study was to verify the functionality and driving safety of fixing a modular unit with a high prefabrication ratio to a vehicle for transportation to the site using two novel adapter blocks specially developed for this purpose. When asked to evaluate their performance for this study, the truck drivers selected adaptor block type B as providing the highest convenience and functionality. In real-world driving experiments, maximum loads of 15 kN and 25 kN were measured on adapter block types A and B, respectively. Future improvements in the adapter blocks that take the safety ratio and the improved convenience of use into account are confidently expected to contribute to the eco-friendliness and the improved productivity of modular unit systems.
Highlights
Modular unit systems are attracting attention as an eco-friendly advanced construction method that can enable a revolutionary improvement in productivity while carbon emissions and waste material
Adapter block type A connects the modular unit to the truck bed with fixing belts that are attached to connecting holes at the bottom of the square columns on the module with nuts and bolts; the fixing method used by adapter block type B relies on the frictional force created as a result of the fixing belt running through a C-channel along the bottom of the modular unit (Figure 3)
As this study involved fixing the modular units to the low-bed trailers using the new adapter blocks with multiple strain gages installed, the attached strain gages and wiring inevitably interfered to some extent with the fixing operation
Summary
Today’s construction industry suffers from a number of limitations due to existing construction systems, including stagnation of productivity, excessive carbon emissions and excessive creation of construction waste, among. It is necessary to develop a new method that can fix and safely transport modular units with a high prefab ratio on vehicles in order to maximize the eco-friendliness of modular unit systems [6] To address this need, Park et al [6] developed two possible adapter blocks (types A and B) and simulated their structural safety, but their actual performance has not previously been tested and evaluated experimentally in a real-world setting. Their utility and convenience for real-world fixing operations are verified by attaching a unit module with a high prefab ratio, including pre-installed interior/exterior materials, to a vehicle using the newly developed adapter blocks and their roadworthiness confirmed by driving the loaded transporting vehicle over a typical road surface Implementing this type of technology to improve modular units’ prefab ratios will provide a useful way to boost the eco-credentials of modular unit systems
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