JP-2026076020-A - Fire-resistant coating structure

Abstract

[Problem] To provide a fire-resistant coating structure that can suppress heating of the hole wall through which a pipe is inserted when a wood-based fire-resistant coating material is placed on the outside of the fire-resistant coating material. [Solution] The fire-resistant covering structure comprises a hole covering material (hole covering material 20, outer covering material 30) that covers the hole wall of a through hole 12H formed in the web 12 of the steel beam 10; a fire-resistant covering material (box-shaped covering material 40) that is positioned outside the hole covering material in the axial direction of the through hole 12H and is formed in a box shape surrounding the flange 14 and web 12 of the steel beam 10; a wood-based fire-resistant covering material (wood-based covering material 46) laminated on the outside of the fire-resistant covering material; through holes for pipe insertion formed in the hole covering material, fire-resistant covering material, and wood-based fire-resistant covering material, respectively, and communicating with each other; and a wood-based covering material 50 that covers the hole wall of the through hole in the wood-based fire-resistant covering material. [Selection Diagram] Figure 2

Inventors

• 蛇石 貴宏
• 望月 久智
• 冨田 拓
• 青木 慧
• 齋藤 真美
• 花井 厚周
• 飯田 智裕
• 大橋 宏和
• 堀 正人
• 坂田 順二
• 坂上（久保木） 智絵

Assignees

• 株式会社竹中工務店
• 日本インシュレーション株式会社
• センクシア株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (7)

1. A hole covering material that covers the hole wall of a through hole formed in the web of a steel beam, A fire-resistant covering material is positioned outside the hole covering material in the axial direction of the through hole, surrounding the flange and web of the steel beam and forming a box shape. A wood-based fire-resistant coating material is laminated on the outside of the aforementioned fire-resistant coating material, The hole covering material, the fire-resistant covering material, and the wood fire-resistant covering material each have through holes for inserting pipes that are in communication with each other, A wood covering material that covers the hole wall of the insertion hole in the aforementioned wood fire-resistant covering material, A fire-resistant coating structure equipped with this feature.
2. The aforementioned hole covering material is Distributed across the fire-resistant coating material arranged on both sides of the web, and laminated in the axial direction of the through-hole, The fire-resistant coating structure according to claim 1.
3. The aforementioned hole covering material is A cylindrical tube is positioned across the fire-resistant covering material arranged on both sides of the web, In the radial direction of the through hole, the covering material laminated on the outside of the pipe body, Equipped with, The fire-resistant coating structure according to claim 1.
4. The aforementioned hole covering material is A duct is arranged across the fire-resistant covering material that is positioned on both sides of the web, The wooden covering material covers the inner circumferential surface of the duct, Equipped with, The fire-resistant coating structure according to claim 1.
5. The aforementioned wood covering material is Includes a thermally expandable sheet covering the hole wall, The fire-resistant coating structure according to claim 1.
6. A cylindrical steel plate is placed between the hole wall and the thermally expandable sheet. The thermally expandable sheet is bonded to the steel plate. The fire-resistant coating structure according to claim 5.
7. The aforementioned wood covering material is Contains calcium silicate, The fire-resistant coating structure according to claim 1.

Description

This invention relates to a fire-resistant coating structure. Patent Document 1 below shows a fire-resistant structure in which the outer layer of the fire-resistant coating covering a steel beam is formed of wood. Japanese Patent Publication No. 2024-53827 This is a cross-sectional view showing a common configuration in each embodiment of the fire-resistant covering structure of the present invention, where (B) is an elevation view of a steel beam in a side view, and (C) is a cross-sectional view taken along the line C-C in (A).This is an enlarged cross-sectional view showing a fire-resistant coating structure according to the first embodiment of the present invention.This is an enlarged cross-sectional view showing a fire-resistant coating structure according to a second embodiment of the present invention.This is an enlarged cross-sectional view showing an example in which reinforcing material has been added to the fire-resistant coating structure according to the second embodiment of the present invention.This is an enlarged cross-sectional view showing a fire-resistant coating structure according to the third embodiment of the present invention.This is an enlarged cross-sectional view showing a modified example of the covering area of the wood covering material applied to the fire-resistant covering structure according to each embodiment of the present invention.This is an enlarged cross-sectional view showing a modified example in which the tubular body is omitted in the wood covering material applied to the fire-resistant covering structure according to each embodiment of the present invention.This is an enlarged cross-sectional view showing a modified example in which the wood covering material applied to the fire-resistant covering structure according to each embodiment of the present invention is formed from a calcium silicate fire-resistant covering board.This is an enlarged cross-sectional view showing another modified example in which the wood covering material applied to the fire-resistant covering structure according to each embodiment of the present invention is formed from a calcium silicate fire-resistant covering board. The fire-resistant coating structure according to an embodiment of the present invention will be described below with reference to the drawings. Components indicated by the same reference numerals in each drawing are considered to be the same component. However, unless otherwise specified in the specification, each component is not limited to one, and multiple components may exist. Furthermore, explanations of redundant components and reference numerals in each drawing may be omitted. This disclosure is not limited to the following embodiments, and modifications can be made as appropriate within the scope of the purpose of this disclosure, such as omitting components, substituting different components, or combining one embodiment with various modifications. [First Embodiment] <Steel beams> Figure 1 shows a configuration common to each embodiment (first to third embodiment) of the present invention. The steel beam 10 is an H-shaped steel beam having a web 12 and upper and lower flanges 14. A circular through-hole 12H for passing piping through is formed in this steel beam 10. Prior to inserting the piping through the through-hole 12H, the fire-resistant covering structure of the present invention is constructed in the steel beam 10. The steel beam 10 supports the slab S. The fire-resistant coating structure according to this embodiment of the present invention is a structure for fire-coating both sides and the bottom surface of the steel beam 10 below the slab S. Furthermore, this fire-resistant coating structure is also a structure for fire-coating the through-hole 12H formed in the steel beam 10. <Fire-resistant coating structure> In the following description, the configuration common to each embodiment will be described first, followed by the configuration specific to the first embodiment. The fire-resistant covering structure, as a configuration common to each embodiment, includes a box-shaped covering material 40 and a wood-based covering material 46. The box-shaped covering material 40 is an example of a fire-resistant covering material in this invention. The wood-based covering material 46 is also an example of a wood-based fire-resistant covering material in this invention. (Box-shaped covering material) The box-shaped covering material 40 is a fire-resistant covering material that surrounds the flange 14 and web 12 of the steel beam 10 from three sides (sides and below). The box-shaped covering material 40 is formed by comprising side covering material 42 and bottom covering material 44. Calcium silicate fire-resistant covering boards are used as the material for forming the side covering material 42 and bottom covering material 44. The side covering material 42 has through holes 42H formed therein. The through holes 42H are coaxially positioned with the through ho