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Dismantling of Reinforced Concrete Using Steam Pressure Cracking System: Drilling and Crack Propagation
This study investigated a new dismantling system for concrete structures using a steam pressure cracking agent. We improved the mechanical systems such that it can drill through reinforcing steel bars. Therefore, the control method of the system and shape of the drill tip were improved. When the dri...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9959017/ https://www.ncbi.nlm.nih.gov/pubmed/36837028 http://dx.doi.org/10.3390/ma16041398 |
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author | Kamiya, Osamu Takahashi, Mamoru Miyano, Yasuyuki Ito, Shinichi Murata, Kenji Kawano, Makoto Maisawa, Arata Nanao, Jumpei Kazumi, Takashi Nakatsu, Masanobu Mizuma, Hiroyuki Miyota, Tatsuya Nagao, Kota Iwama, Yuichi |
author_facet | Kamiya, Osamu Takahashi, Mamoru Miyano, Yasuyuki Ito, Shinichi Murata, Kenji Kawano, Makoto Maisawa, Arata Nanao, Jumpei Kazumi, Takashi Nakatsu, Masanobu Mizuma, Hiroyuki Miyota, Tatsuya Nagao, Kota Iwama, Yuichi |
author_sort | Kamiya, Osamu |
collection | PubMed |
description | This study investigated a new dismantling system for concrete structures using a steam pressure cracking agent. We improved the mechanical systems such that it can drill through reinforcing steel bars. Therefore, the control method of the system and shape of the drill tip were improved. When the drill tip is stuck with chips and stopped, it is automatically pulled out and reinserted to recover the rotation. By changing the tip angle of the drill bit from 75° to 90°, it became possible to cut reinforcing bars, which were difficult to cut previously. In addition, we designed a crawler-type mechanical system and improved it such that it can be moved to the appropriate position and operated at any angle. This study revealed that the energy required for the drilling process accounts for more than 90% of the total dismantling energy. Through experiments using an impact hammer drill and observations of fracture surfaces using a three-dimensional scanner, we analysed the characteristics of reinforced concrete. In addition, the feasibility of the design for dismantling reinforced concrete was confirmed based on the determined energy associated with crack propagation. |
format | Online Article Text |
id | pubmed-9959017 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-99590172023-02-26 Dismantling of Reinforced Concrete Using Steam Pressure Cracking System: Drilling and Crack Propagation Kamiya, Osamu Takahashi, Mamoru Miyano, Yasuyuki Ito, Shinichi Murata, Kenji Kawano, Makoto Maisawa, Arata Nanao, Jumpei Kazumi, Takashi Nakatsu, Masanobu Mizuma, Hiroyuki Miyota, Tatsuya Nagao, Kota Iwama, Yuichi Materials (Basel) Article This study investigated a new dismantling system for concrete structures using a steam pressure cracking agent. We improved the mechanical systems such that it can drill through reinforcing steel bars. Therefore, the control method of the system and shape of the drill tip were improved. When the drill tip is stuck with chips and stopped, it is automatically pulled out and reinserted to recover the rotation. By changing the tip angle of the drill bit from 75° to 90°, it became possible to cut reinforcing bars, which were difficult to cut previously. In addition, we designed a crawler-type mechanical system and improved it such that it can be moved to the appropriate position and operated at any angle. This study revealed that the energy required for the drilling process accounts for more than 90% of the total dismantling energy. Through experiments using an impact hammer drill and observations of fracture surfaces using a three-dimensional scanner, we analysed the characteristics of reinforced concrete. In addition, the feasibility of the design for dismantling reinforced concrete was confirmed based on the determined energy associated with crack propagation. MDPI 2023-02-07 /pmc/articles/PMC9959017/ /pubmed/36837028 http://dx.doi.org/10.3390/ma16041398 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Kamiya, Osamu Takahashi, Mamoru Miyano, Yasuyuki Ito, Shinichi Murata, Kenji Kawano, Makoto Maisawa, Arata Nanao, Jumpei Kazumi, Takashi Nakatsu, Masanobu Mizuma, Hiroyuki Miyota, Tatsuya Nagao, Kota Iwama, Yuichi Dismantling of Reinforced Concrete Using Steam Pressure Cracking System: Drilling and Crack Propagation |
title | Dismantling of Reinforced Concrete Using Steam Pressure Cracking System: Drilling and Crack Propagation |
title_full | Dismantling of Reinforced Concrete Using Steam Pressure Cracking System: Drilling and Crack Propagation |
title_fullStr | Dismantling of Reinforced Concrete Using Steam Pressure Cracking System: Drilling and Crack Propagation |
title_full_unstemmed | Dismantling of Reinforced Concrete Using Steam Pressure Cracking System: Drilling and Crack Propagation |
title_short | Dismantling of Reinforced Concrete Using Steam Pressure Cracking System: Drilling and Crack Propagation |
title_sort | dismantling of reinforced concrete using steam pressure cracking system: drilling and crack propagation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9959017/ https://www.ncbi.nlm.nih.gov/pubmed/36837028 http://dx.doi.org/10.3390/ma16041398 |
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