mechanical and electrical installation projects, such as bridge tray , water pipes, air ducts, etc., will penetrate the floor slabs and walls, forming a large number of holes or gaps. If fire is not blocked, once a fire occurs, the fire or smoke will spread rapidly in the ground.
1 electromechanical pipeline forms a large number of penetrating holes
In the bridge fire simulation experiment, it can be clearly seen that the bridge without fire-proof sealing will rise to the top in a short time due to the "chimney effect".
No fireproof blocking
has fireproof blocking
Therefore, Fireproof blocking as an important process in mechanical and electrical engineering must be fully in place. In addition, on the basis of meeting performance requirements, fireproof sealing should also take into account the convenience of maintenance of the through-body and the neat and beautiful appearance.
What are the fireproof sealing materials?
Fireproof sealing material should have basic properties such as fire resistance and thermal expansion. In the "Technical Standards for Building Fireproof Seal Application" to be implemented on July 1, 2020, nearly ten types of fireproof sealing materials are listed. We combined the actual application of the project and summarized as follows:
Fireproof mud
fireproof sealant
inorganic fire blocking
fire barrier
Fireproof partition
Fireproof spray mineral wool board
Fire resistance ring
Fireproof coating
Fireproof module
Fireproof foam
· Organic fireproof blocking material
includes: fireproof mud, fireproof sealant, good plasticity, suitable for occasions where irregular shapes and objects are considered for replacement.
· Inorganic fireproof blocking material
, also known as fireproof plaster, can cure quickly and is suitable for occasions where the penetration remains basically unchanged after blocking.
· Fire block
is convenient to construct and is suitable for situations where larger holes and penetrations are considered for replacement.
· Fireproof Board
includes: fireproof partitions, fire-proof sprayed mineral wool boards, high mechanical strength, suitable for larger holes and take into account load-bearing functions.
· Fire resistance ring
The metal clamp is filled with flame retardant expansion material inside, which can be fixed to the outer wall of plastic pipe .
· Fireproof coating
can form a refractory insulation protective layer and can be applied to the surface of cables and structures.
In addition, there are · fireproof module · fireproof foam , etc.
These materials are often not single, but are flexible combinations of two or more to jointly complete the fireproof sealing of the pipeline system.
How to do fireproof blocking of pipelines?
Next, we will take a look at the typical practices of fireproof and sealing construction in various places in mechanical and electrical engineering based on the actual application of the current project.
· Bridge tray, busbar
bridge tray through floor
busbar through floor
bridge tray runs through the wall
busbar penetrates through the wall
When the bridge tray and busbar runs through the floor slab and the wall, a water barrier should be set up at the floor slab. A fireproof board with a certain strength is installed as a support at the bottom of the floor slab. When the internal orifice is large, a fireproof enclosure can be used to seal it, and then a fireproof mud plug joint can be used. If the internal orifice is small, a fireproof mud can be directly sealed.
· Cable
cable passes through the bottom of the cabinet
cable penetrates the cable trench
When the cable passes through the bottom of the electrical cabinet or penetrates the cable trench, fireproof mud can be used to seal it. In order to avoid the blockage causing corrosion to the cable insulation layer, plastic or rubber tube can be added to protect it.
· Water supply and drainage pipeline
Metal pipeline penetrates the floor slab
Plastic pipeline runs through the floor slab
Water supply and drainage pipeline runs through the wall
Casing should be set up when passing through the floor slab and wall. Fireproof mud can be used to seal the pipes. Plastic pipelines should be installed on the bottom plate of the floor slab and both sides of the wall.
· Air duct
Air duct penetrates the wall
Air duct runs through the floor slab
Air duct runs through the wall and floor slabs. A casing should be set up. Fireproof rock wool and other non-combustible materials are filled with fireproof mud on the outside.
· Closed
Closed example
After the fireproof sealing of the electromechanical pipe is completed, the fireproof board or thin steel plate can be used for closing treatment to improve the appearance quality effect.
