| 摘要 |
<p>The present invention relates to a fire-resistant structure, a height adjusting coupler, and an air duct construction structure using the coupler. The present invention, which is used to build a dry air duct for various large buildings such as an apartment building, does not use a fire-resistant member such as a backup agent, a sealant, or a caulking agent on a sleeve formed on all inter-story areas and directly connects a linear granular duct pipe to the sleeve via the coupler to significantly increase the fire safety. The coupler is formed to ensure easy installation and assembly in accordance with the height of each story when assembled in the vertical direction with the granular duct, and is capable of shortening the construction time by ensuring the convenience of the work process to enhance the productivity of the construction.</p> |
