GB/T 51410-2020 in English

ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.

This standard is jointly revised by Tianjin Fire Research Institute of Ministry of Emergency Management and Shandong Qifeng Construction Engineering Co., Ltd. with relevant organizations in accordance with the requirements of the Notice on printing and distributing the development and revision plan on engineering construction standards and codes in 2014 (JIANBIAO [2013] No.169) issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China.

The drafting group has finalized this standard through review after extensive investigation and careful summarization of practical experience of firestop and fire scientific and technological achievements for domestic and foreign buildings, with reference to relevant international and foreign advanced standards and by widely soliciting opinions during the process of developing this standard.

The technical contents of this standard mainly include the general provisions, terms, basic requirements, firestop design for construction joint, firestop design for penetration opening, as well as construction and acceptance.

The Ministry of Housing and Urban-Rural Development of the People's Republic of China is in charge of the administration of this standard, the Ministry of Emergency Management of the People's Republic of China is in charge of its routine management, and Tianjin Fire Research Institute of Ministry of Emergency Management is responsible for the explanation of specific technical contents. It is hoped that all organizations will conscientiously sum up experience and accumulate data in combination with engineering practice and scientific research. If there are any comments or suggestions during implementation, please send them to Tianjin Fire Research Institute of Ministry of Emergency Management (Address: No.110, Weijin South Road, Nankai District, Tianjin, 300381, China).



Contents

1 General provisions 1
2 Terms 2
3 Basic requirements 3
4 Firestop design for construction joint 6
5 Firestop design for penetration opening 8
5.1 General requirements 8
5.2 Firestop for pipe penetration opening 8
5.3 Firestop for cable penetration 10
5.4 Firestop for other penetration openings 11
6 Construction and acceptance 12
6.1 General requirements 12
6.2 Construction 13
6.3 Acceptance 15
Annex A Records on inspection of firestop during construction 18
Annex B Records on quality acceptance of firestop in concealed works 19
Explanation of wording in this standard 20
List of quoted standards 21



1 General provisions

1.0.1 This standard is formulated to prevent flame and smoke from spreading in buildings through construction joints and penetration openings, ensure the integrity and effectiveness of construction fire prevention and smoke compartmentation, ensure personal safety and reduce fire losses.

1.0.2 This standard is applicable to the design, construction and acceptance of firestop for construction joint and penetration opening in construction projects.

1.0.3 The design, construction and acceptance of firestop for buildings shall be implemented based on the relevant national policies, comply with the provisions of relevant laws and regulations on engineering construction, and ensure that it is safe and serviceable, economical and rational, environmentally friendly and healthy, and technologically advanced.

1.0.4 The design, construction and acceptance of firestop for buildings shall also meet the requirements of current national relevant standards in addition to those in this standard.

 
2 Terms

2.0.1 firestop
structural measure for fire protection to use materials with certain fireproof, smoke-proof and heat-insulating properties to seal or fill construction joints and penetration openings, which can cooperate with corresponding building structures or members within the designed fire-resistant time to prevent heat, flame and smoke from passing through

2.0.2 construction joint
joints between building structures or members, those between other fireproof partitions and building structures or members, and those formed between any equipment pipeline and fireproof structures or members when the former passes through these structures or members

2.0.3 penetrated item
building structures or members that need to pass through pipelines and other objects due to process and functional requirements

2.0.4 penetration item
objects passing through the penetrated item

2.0.5 penetration opening
opening formed when a penetration item passes through a penetrated item

2.0.6 blank opening
opening reserved on fireproof partition members or building structures in order to meet process and functional requirements

2.0.7 penetration firestop system
combined firestop items composed of several different types of firestop materials and their supports

 
3 Basic requirements

3.0.1 The fireproof, smoke-proof and heat-insulating properties of penetration firestop system shall not be inferior to the requirements for those properties of building members or structures at the firestopped part, and they shall be able to prevent this system from falling off, displacing, deforming and cracking under normal use and fire conditions.

3.0.2 Firestop materials for buildings shall be determined according to the type of the part to be firestopped, the sizes of joints or openings and the fire resistance requirements, and they shall also meet the following requirements:

1 for construction joints, flexible organic firestop materials, fireproof sealants, fireproof sealing paints and their combinations should be selected;

2 for penetration openings with small annular clearances, flexible organic firestop materials, fireproof sealants, foam firestop materials, firestop belts and collars and their combinations should be selected;

3 for penetration openings with large annular gaps, inorganic firestop materials, firestop pillows, modules, plates, belts and collars and their combinations should be selected.

3.0.3 Backing materials for firestop for buildings shall be incombustible, and should be selected in combination with the characteristics of part to be firestopped, firestop materials and firestop methods. When mineral cotton is used as the backing material, its bulk density shall not be lower than 80kg/m3, and it melting point not lower than 1,000℃. Meanwhile, before filling, the mineral cotton in its natural state shall be pre-compressed by not less than 30%, and then squeezed into the corresponding part to be firestopped.

3.0.4 When inorganic firestop material is used, the thickness of such material shall be consistent with that of penetration opening, and the joints subjected to firestop shall be filled with organic firestop material, and the filling depth shall not be less than 15mm.

3.0.5 When flexible organic firestop material is used, the filling depth of such material shall be equal to that of construction joint or annular gap, and the length shall be the full length of construction joint or annular gap. When used together with backing materials such as mineral cotton, the flexible organic firestop material shall have a filling depth of not be less than 15mm, and a length equal to the full length of construction joint or annular gap. The interior of construction joint or annular gap shall be completely filled with backing materials such as mineral cotton.

 
3.0.6 When a fireproof sealant is used, it shall be used together with backing materials such as mineral cotton, and it shall have a filling depth of not be less than 15mm, and a length equal to the full length of construction joint or annular gap. The interior of construction joint or annular gap shall be completely filled with backing materials such as mineral cotton. When the width of construction joint or annular gap is greater than or equal to 50mm, the filling depth of fireproof sealant shall not be less than 25mm.

3.0.7 When a fireproof sealing paint is used, its coating thickness should not be less than 3mm, its dry film thickness shall not be less than 2mm, its length shall be the full length of the construction joint, and its width shall be greater than that of the construction joint; the interior of the construction joint shall be completely filled with backing materials such as mineral cotton. The lap width of fireproof sealing paint shall not be less than 20mm.

3.0.8 When firestop pillows or firestop modules are used, they shall be stacked in a staggered and dense manner, and organic firestop materials shall be used to block the joints in corresponding parts.

3.0.9 When firestop plates are used, organic firestop materials shall be used to block the periphery and overlapping parts of the plates; when the plates are installed as covers, their periphery shall also be fixed with metal anchors, and the distance between the anchors should not be greater than 150mm.

3.0.10 When foam blocking material is used, its blocking thickness shall be consistent with that of the penetration opening.

3.0.11 When firestop belts or collars are used, either of them shall be set on both sides of a horizontally penetrated part. For a vertically penetrated part, they shall be set at the lower side of the part; for penetrated parts in corrosive places, firestop belts should be used.

3.0.12 When the penetration firestop system or penetration item is not rigid enough, steel mesh, incombustible slab/plate or bracket shall be used to support and fix them on both sides of horizontally penetrated parts or on lower sides of vertically penetrated parts. Fire protection measures shall be taken for supports such as steel mesh, incombustible plates or brackets and their fixtures with walls, floors or other structures.

3.0.13 When a penetrated item has a cavity structure, measures shall be taken to prevent the deformation of firestop materials or penetration firestop systems from affecting the firestop effect.

 
3.0.14 The penetration firestop systems for penetration openings on a floor shall not bear any other external loads; for the large parts to be firestopped, protective measures such as setting railings around the penetrated parts shall be taken, and obvious signs shall be set.

3.0.15 The combustion behavior, physical and chemical properties of firestop materials such as inorganic firestop materials, flexible organic firestop materials, fireproof sealants and foam firestop materials, and the fire resistance of penetration firestop system shall meet the relevant requirements of the current national standard GB 23864 Firestop materials. The combustion behavior, physical and chemical properties and fire resistance of the firestop collars shall meet the relevant requirements of the current industrial standard GA 304 Firestop collar for plastic pipes.

1 General provisions
2 Terms
3 Basic requirements
4 Firestop design for construction joint
5 Firestop design for penetration opening
5.1 General requirements
5.2 Firestop for pipe penetration opening
5.3 Firestop for cable penetration
5.4 Firestop for other penetration openings
6 Construction and acceptance
6.1 General requirements
6.2 Construction
6.3 Acceptance
Annex A Records on inspection of firestop during construction
Annex B Records on quality acceptance of firestop in concealed works
Explanation of wording in this standard
List of quoted standards