Gypsum Board Fireproof Liner for Beam Penetration Cracking
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Solution Overview
Problem
Conventional fireproof covered structures for penetration parts in wooden buildings face challenges in achieving accurate and cost-effective formation of tubular fireproof materials, which often result in insufficient dimensional accuracy and increased production costs, and are prone to cracking due to differences in material behavior and load support, compromising their firestop functionality.
Innovation Solution
A fireproof covered structure that uses a tubular fireproof covering material formed by stacking and unitarily connecting annular gypsum board pieces of specific thicknesses, fixed with metal fasteners, to ensure accurate and economic installation, preventing cracking and maintaining fireproof integrity by accommodating height differences at boundary portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tubular fireproof covering material is formed by casting firestop material into a tubular mold, then the firestop function is provided, but sufficient dimensional accuracy cannot be obtained and it is difficult to snugly fit into the penetration part
Solution Approach 1:
The tubular fireproof covering material is divided into multiple tubular sections, each formed from individual gypsum boards. These segmented sections are then connected using connection pieces to form the complete covering structure, enabling accurate dimensional control while simplifying the manufacturing process.
Solution Approach 2:
Connection pieces are introduced as intermediary elements to join the tubular sections together. These connection pieces facilitate accurate assembly and snug fitting into the penetration part while maintaining the fireproof integrity of the overall structure.
2Reliability
If mortar, gypsum, or calcium silicate is used to form a tubular firestop portion, then firespread prevention is achieved, but the tubular member is likely to crack due to differences in material behavior and load support
Solution Approach 1:
The tubular fireproof covering material is segmented into multiple sections that can independently accommodate structural movements and load variations. This segmentation prevents stress concentration and cracking that would occur in a monolithic structure made from mortar or gypsum.
Solution Approach 2:
The invention uses gypsum boards as the primary material for tubular sections, which are then connected using connection pieces. This composite construction combines the fireproof properties of gypsum with the structural stability provided by the connection system, preventing cracking while maintaining firestop functionality.
3Shape
If a penetration part is formed in a beam with burning margin design, then the design aesthetic is maintained, but fireproof is lost at the penetration part allowing fire to spread
Solution Approach 1:
The tubular fireproof covering material is nested within the penetration part formed in the beam. This nested structure maintains the aesthetic burning margin design on the exterior while providing fireproof protection internally at the penetration location, preventing fire spread through the beam.
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4(a)~4(e)
AI summary
A fireproof covered structure for covering a penetration part (11) formed in a fireproof beam (20) of a wooden building to make the penetration part (11) fireproof, wherein a tubular fireproof covering material (12) is attached to the penetration part (11) while covering an inner peripheral surface of the penetration part (11). The tubular fireproof covering material (12) is formed by stacking a plurality of gypsum board pieces (13a) cut out from commercially available gypsum boards (13) of thicknesses of 9.5 mm to 25.5 mm, in the thickness direction and unitarily connecting the gypsum board pieces (13a). The tubular fireproof covering material (12) is inserted into and attached to the penetration part (11) such that a connecting portion (15) that connects gypsum board pieces (13a) that are adjacent in the stacking direction is disposed at a boundary portion (23) between a structural member (21) and a covering member (22) of the fireproof beam (20), or at a portion close to the boundary portion (23).