雙索懸吊式輕量橋樑檢測系統

A Lightweight Bridge Inspection System Using Dual-Cable Suspension Mechanism

楊基恩(Chi-En Yang)

指導教授 ： 康仕仲

國立臺灣大學/工學院/土木工程學研究所/碩士(2012年)

https://doi.org/10.6342/NTU.2012.01758

摘要

目前橋樑檢測仍以傳統的目視檢測為主，檢測人員需利用鷹架、吊索或大型機械車輛等方式進行橋面下之檢測，費工費時且工作環境危險。部分研究提出以機械手臂搭載影像擷取設備，進行橋面下之檢測，以增進人員安全；但此種方法設備龐大，僅適用於大型橋梁，且造價昂貴。本研究致力於研發一輕便、操作簡易、低價之橋樑檢測系統，並能適用於中小型橋梁之橋面下檢測。本系統主要包含硬體設備，以及檢測策略。硬體設備可分為三部分:監控端、雙索懸吊機構、檢測端。檢測人員操作雙索懸吊機構，將檢測端垂放至橋面下，搭配無線傳輸技術以及事先規劃之檢測策略，取得橋面下之檢測影像。檢測策略之方針有三:完整、效率、彈性。檢測策略主要分為垂直以及水平策略，包含一般之循序檢測以及較詳細之多視角檢測。本研究主要進行了兩次現地實驗，實驗結果顯示本系統可順利在狹窄之橋面實施檢測，不影響橋面交通。本系統可取得公分等級解析度之檢測影像，一般目視檢測可察覺之缺陷如裂縫、混凝土剝落等，均可清楚發現。本研究提出一新穎橋樑檢測系統，在未來研究改良後，能補足現有橋樑檢測之缺點，增進整體橋樑檢測之效率及人員安全。

關鍵字

橋樑檢測 ； 目視檢測 ； 可攜式設備 ； 即時影像 ； 吊索式機構

並列摘要

Visual inspection is the primary means of evaluation of the structural conditions of a bridge. Since visual inspection often requires engineers to place themselves in hazardous environments, many researchers have developed inspection vehicles and robot arms in order to increase safety and accessibility during inspections. However, the use of such heavy equipment may only be suitable for large bridges due to restrictions in working space. Therefore, this research aims to develop an innovative bridge inspection system that is portable, simple, affordable, and can be easily applied on smaller yet large number bridges. We developed a systematic approach, which includes a lightweight inspection system using a dual-cable suspension mechanism, as well as strategies to conduct inspections. The inspection system is composed of three components: the controller, the dual-cable suspension, and the inspection platform. By using a dual-cable suspension mechanism, the bridge inspector can manipulate the controller to place the inspection platform beneath the bridge and capture images with digital vision devices. Unlike robot arms or heavy vehicles, the cable-based system has the capacity to sustain much more than its own weight. This means that the total weight is greatly reduced and the cost is much lower than in existing methods. Additionally, the inspection strategies developed in this research can provide complete, efficient and flexible inspection procedures. Vertical and horizontal inspection strategies have been developed to allow sequential inspection for normal structures and multi-view inspection for special structures by manipulation of the inspection system. A prototype of the inspection system has been constructed and two field experiments were conducted to test the feasibility of the proposed method. The experimental results proved that the proposed system was able to work efficiently on a narrow bridge without affecting the traffic. The inspection system can also provide centimeter-level resolution inspection images, allowing general defects such as cracks and spalling concrete to be seen clearly. With further research, the proposed system and concept is expected to enhance overall bridge inspection efficiency.

並列關鍵字

bridge inspection ； visual inspection ； portable device ； real-time vision ； cable-based mechanism

參考文獻

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