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Design and Prototyping of Lifting Devices for Manhole Cover using Structural Analysis and 3D Printing

3D 프린팅과 구조해석을 이용한 맨홀의 부양장치 설계 및 제작

  • Lee, Hyoungwook (Department of Automotive Engineering, Korea National University of Transportation)
  • 이형욱 (한국교통대학교 자동차공학과)
  • Received : 2018.07.24
  • Accepted : 2018.10.05
  • Published : 2018.10.31

Abstract

In order to maintain manholes installed on the road, the manhole should be easy to open and close. Manhole covers under harsh conditions require that they can be lifted when attempting to open the manhole because the frame and cover are stuck and difficult to open and close. In this study, the design of a lifting mechanism was carried out to improve and integrate the locking type manhole. The mechanism of the locking manhole is that when the bolt located at the center is turned, the hub connected with the bolt descends, and the hook connected to the hub is rotated. The end of the hook is hooked to the manhole frame. The auxiliary device was installed on the hook so that the manhole cover can be lifted. The structure was designed to endure about 300kg of lifting force based on 70% of the yield stress of the hook to perform lifting function. The shape design was performed through the structural analysis using the finite element method. First, the basic design was performed with the simplified 2-dimensional model and the attachment position and shape were designed through the 3-dimensional model. In order to find out the structural problems of the designed shape, the scale downed model was fabricated through 3D printing and confirmed that the lifting function worked. Finally, it was confirmed that both the locking and the average lifting of about 6.1 mm can be done by applying the lifting mechanism through the machining and applying it to the existing locking manhole.

Keywords

Manhole;Lifting Device;Finite Element Analysis;3D Printing;Locking Type

Acknowledgement

Supported by : 한국교통대학교

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