# Visual Language-Aided Construction Fire Safety Planning Approach in Building Information Modeling
## 3 Structure of Con-fire Safety Planning Approach
### Rule Extraction and Logic Development (RELD) Module  
Accident reports offer vital information such as root causes, responsible roles, and recommended preventive techniques for the avoidance of future accidents. To understand the fire hazards and its preventive methods in construction, this research work was initiated with the assessment of accident reports. Deployment of portable firefighting equipment was found the crucial preventive measure in case of typical under-construction works, while installation of the sprinkler system was noticed vital for fire-sensitive projects such as steel-related projects and tunnels.  
In order to ensure a safe environment in terms of fire mishaps, OSHA regulations for fire protection and prevention are investigated in the second step. The safety-related fire regulations have been extracted from the OSHA database. These regulations provide lessons learned from the past and current best practices to minimize the probability of accidents in the construction workplace. Table 1. revealed the OSHA standard number 1926, which describes the related safety and health regulations to the construction industry. Fire protection and prevention rules are depicted under the subpart-F of construction safety and health standard (1926). The standard number 1926.150 demonstrates the fire protection rules, which include general requirements, water supply, portable firefighting equipment, fixed firefighting equipment, and fire alarm devices, as listed in Table 1.  
Portable firefighting equipment plays a significant role to deal with the construction fire, as many job sites do not contain permanent firefighting systems [3]. Since the distance between the portable firefighting equipment with the persons working in the area also influence the reactive time required to control the fire when it is in the initial stage, OSHA construction fire standards specify the limit of the distance between the persons and firefighting equipment. According to OSHA, \"A fire extinguisher, rated not less than 2A, shall be provided for every 3000 square feet of the protected building area, or major fraction thereof. Travel distance from any point of the protected area to the nearest fire  
Figure 2: System architecture for Con-fire safety planning approach.  
extinguisher shall not exceed 100 feet.\" To limit the scope of the work, this paper merely considers portable firefighting equipment planning for further research. Apart from that, this research also generates an escape plan as an employee emergency route plan. The manually extracted regulations relevant to fire protection are converted into mathematical logics from text-based information, which is then employed for visual programming in the Design for Construction Fire Safety (DCFS) Module. The following conditions are extracted from the OSHA fire safety rules for construction.  
1. Placement of at least one fire extinguisher of type, rated not less than 2A, for the area of 3000 square feet. \[2A=\frac{Total\ Protected\ Area}{3000}\]
2. The distance from any point of the protected area to the nearest fire extinguisher should be less than or equal to 100 feet while using the fire extinguisher type, rated not less than 2A. \[Distance\ from\ any\ point\ \leq\ 100\ feet\ for\ rated\ \geq\ 2A\]
3. In the case of using a fire extinguisher, rated not less than 10B, the distance from any point of the protected area to the closest fire extinguisher should be less than or equal to 50 feet. \[Distance\ from\ any\ point\ \leq\ 50\ feet\ for\ rated\geq 10B\]