Application Advantages of U-Shaped Aluminum Baffles in Subway Platform Ceilings

Subway platforms are special public spaces with highly dense personnel, which have extremely high requirements for fire prevention, sound absorption, easy maintenance, installation speed, durability and other aspects of ceiling materials. By virtue of its unique advantages, U-shaped aluminum baffle has become the mainstream choice for domestic subway platform ceilings at present, and more than 90% of new subway lines adopt U-shaped aluminum baffles for platform ceilings.

Subway platform ceilings have several special requirements. First is extremely high fire protection requirements. Subway stations belong to underground crowded places, ceiling materials must reach Class A non-combustible, in case of fire, materials cannot burn, cannot produce toxic smoke; second is sound absorption requirements, subway platform space is closed, dense personnel, many broadcast systems, too long reverberation time will lead to unclear broadcast, affecting safe evacuation, requiring ceiling materials to have good sound absorption effect; third is easy maintenance requirements, there are a large number of ventilation, fire protection, lighting, signal and other equipment in the platform ceiling, which need frequent maintenance, ceiling system must be easy to disassemble and can be quickly restored after maintenance; fourth is easy cleaning requirements, subway platforms have many people, large dust, ceilings are easy to accumulate dust, need to be easy to clean, not easy to get dirty; fifth is installation speed requirements, subway construction period is tight, ceiling installation speed should be fast, can shorten construction period; sixth is durability requirements, subway design service life is 100 years, ceiling materials should be durable, long service life, low maintenance cost.

U-shaped aluminum baffles perfectly meet all special requirements of subway platforms. First is fire performance, U-shaped aluminum baffles are aluminum alloy material, Class A non-combustible, with Class A non-combustible glass wool sound absorption on the back, the whole system meets Class A fire protection requirements, fully meeting subway fire protection specifications; second is sound absorption performance, U-shaped baffles are open structure, 50mm thick Class A glass wool is laid on the upper part, noise reduction coefficient NRC can reach more than 0.7, effectively reducing platform reverberation time, improving broadcast clarity, improving platform acoustic environment; third is easy maintenance, U-shaped baffles adopt buckle installation, any single baffle can be disassembled independently without special tools, just clamp back after maintenance, maintenance efficiency is more than 10 times higher than traditional aluminum gusset plates, very suitable for places with many equipment and frequent maintenance such as subways; fourth is easy cleaning, U-shaped baffle surface is smooth, no dust accumulation, open structure air circulation, dust is not easy to adhere, usually clean with a feather duster or blow with high-pressure air gun, cleaning is very convenient; fifth is fast installation, U-shaped baffles are factory prefabricated, directly buckle installed on site, skilled workers can install 50-80 square meters a day, 2-3 times faster than other ceiling systems, can greatly shorten construction period; sixth is durability, aluminum alloy material is corrosion resistant, surface powder coating service life is more than 20 years, no deformation, no fading, no need for frequent replacement, low life cycle maintenance cost.

In addition to these performance advantages, the decorative effect of U-shaped aluminum baffles is also very suitable for subway platforms. U-shaped baffles have simple and smooth lines, strong sense of modernity, different colors, specifications, installation directions can achieve different decorative effects, can be arranged longitudinally along the line direction to guide people flow, can also be arranged horizontally, or do shape changes to enrich space effect. The gaps between baffles can perfectly integrate lighting, broadcast, monitoring, fire sprinklers and other equipment, hide equipment in the gaps, achieve the effect of seeing light without seeing lamps and invisible equipment, making the ceiling clean and unified. The open structure will not have a sense of depression, underground space use will not feel stuffy, visual effect is transparent.

Design key points of U-shaped aluminum baffles for subway platforms. First is specification selection, subway platform floor height is usually 4.5-6 meters, baffle specifications usually choose bottom width 50-80mm, height 80-120mm, thickness 0.8-1.0mm, spacing 100-150mm, this specification has coordinated proportion, good visual effect, high sound absorption efficiency, highest cost performance; second is color selection, subway platforms usually choose stable colors such as light gray, white, dark blue, don't choose too bright colors to avoid visual fatigue, different lines can use different colors as line identification colors; third is sound absorption design, 50mm thick 32kg/m³ Class A non-combustible glass wool must be laid on the upper part of baffles, wrapped with Class A non-combustible glass fiber cloth outside, cannot use ordinary non-woven fabric to ensure fire prevention and sound absorption effect; fourth is equipment integration, communicate with electromechanical major in advance during design, arrange lamps, broadcasts, monitoring, sprinklers and other equipment in baffle gaps, equipment width is consistent with gap width to achieve perfect integration; fifth is maintenance corridor, large-span platforms should set maintenance corridors in the ceiling, equipment can be maintained without removing baffles, further improving maintenance efficiency.

Installation precautions: Subway platforms usually have equipment area in the middle and platforms on both sides, ceilings are long strips, baffles should be arranged along the platform length direction during installation, install from one end to the other, make sample sections first, carry out large-area construction after being accepted by design, owner and supervisor; keels should be hot-dip galvanized, moisture-proof and anti-corrosion, because underground space is humid; baffle installation should pull through line to ensure straight lines and even gaps; all on-site cutting parts should be brushed with anti-rust paint and same color paint to avoid rust; adjust the straightness of all baffles after installation to ensure horizontal and vertical; finally tear off protective film and clean surface.

Many domestic subway lines use U-shaped aluminum baffles in large quantities, such as Shenzhen Metro, Guangzhou Metro, Shanghai Metro, Beijing Metro new lines, platform ceilings basically adopt U-shaped aluminum baffles. The platform ceiling of Shenzhen Metro Line 11 adopts white U-shaped aluminum baffles with 0.8mm thickness, 60mm bottom width, 100mm height, 120mm spacing, 50mm thick glass wool is laid on the upper part, it is still clean as new after years of use, with good sound absorption effect, clear broadcast, convenient maintenance, highly praised by the operator. As an express line, Guangzhou Metro Line 18 has higher platform floor, adopts dark gray U-shaped baffles with 80mm bottom width and 150mm height, with stronger line sense and more atmospheric space.

Of course, U-shaped aluminum baffles are not perfect. If the underground station has poor ventilation, condensation may occur on the back of baffles, design should pay attention to ventilation, or paste anti-condensation film on the back of baffles; in addition, open ceiling will see the pipelines and structures above, need to brush the top pipelines and structures dark to weaken visual impact. Generally speaking, U-shaped aluminum baffle is the most suitable material for subway platform ceilings at present, none other, its comprehensive advantages are incomparable to other ceiling materials, and will be more widely used in rail transit field in the future.