Modular construction is a method of construction that involves prefabricating modular indoor spaces in a factory and then assembling them at the construction site. However, dimensional errors made during production in the modular manufacturing factory may hinder assembly at the construction site and delay the entire construction process. In particular, as the quality of intermodular connections determines the structural performance and serviceability of the entire modular building, meticulous quality control is required for the connections. In this study, a method is developed for inspection of the intermodular connection locations to meet the requirements of being accurate, inexpensive, easy-to-use, rapid, and operable by a single person, and then tested in a modular factory. The proposed inspection method consists of three parts: (a) a laser meter mounted on a gimbal, (b) target reflectors based on the tumbling doll principle, and (c) a mobile device as a remote control and for data storage, data post-processing, and visualization of results. The proposed inspection process was tested on a modular unit that had been manufactured at a modular factory; the proposed method outperformed the conventional method in terms of accuracy, inspection time, and work safety. The proposed inspection method allows the accurate and rapid inspection of locations of intermodular connection holes and, thus, its use in modular factories is likely to improve the economics and efficiency of modular construction.

中文翻译：

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检查多层模块化建筑的模块间连接位置

模块化建筑是一种在工厂预制模块化室内空间，然后在施工现场组装的建筑方法。然而，模块化制造工厂生产过程中产生的尺寸误差可能会阻碍施工现场的组装并延误整个施工过程。特别是，由于模块间连接的质量决定了整个模块化建筑的结构性能和适用性，因此需要对连接进行细致的质量控制。本研究开发了一种模块间连接位置检测方法，以满足准确、廉价、易于使用、快速、单人可操作的要求，然后在模块化工厂进行测试。所提出的检查方法由三部分组成：（a）安装在万向节上的激光计，（b）基于翻滚娃娃原理的目标反射器，以及（c）作为远程控制和数据存储、数据发布的移动设备-结果的处理和可视化。拟议的检验过程在模块化工厂制造的模块化单元上进行了测试；该方法在准确性、检查时间和工作安全性方面优于传统方法。所提出的检查方法可以准确、快速地检查模块间连接孔的位置，因此，其在模块化工厂中的使用可能会提高模块化建设的经济性和效率。