| 摘要 |
PURPOSE:To facilitate installation work of a protecting plate by forming an engaging part in a supporting frame member to be installed on the inside face of a duct main body and forming an engaged part, which is engaged with the engaging part slidably in the longitudinal direction, in the protecting plate covering the surface of a heat insulating material. CONSTITUTION:In a duct, which is arranged in a plant installation and has a comparatively large cross sectional area, a heat insulating material such, as ceramic fiber and rock wool, for example, is arranged on the inside face of a plate body 3 constructing a duct main body. On the inside face of the plate body 3, supporting frame plates 11, in each of which plural reverse trapezoidal projections (engaging parts) 12 are formed at the predetermined intervals, are installed at the predetermined intervals along the longitudinal direction. On the other hand, on a protecting plate 21 side, reverse trapezoidal groove parts (engaged parts) 22, which slidably engage with the projection parts 12 of the supporting frame plate 11, are formed. In supporting the heat insulating material on the inside face of a duct main body, the heat insulating material is arranged between the supporting frame plates 11 fixed in the predetermined positions, and then, the protecting plate 21 is installed via the engagement, between the groove parts 22 and the projecting parts 12. |
