Highway Metal Noise Barrier
Highway Metal Noise Barrier
Highway Metal Noise Barrier
STANDS TALL AGAINST NOISE POLLUTION
Hebei Jinbiao manufactures highway metal noise barriers for roads, elevated expressways, bridges and rail corridors. Each system is a steel panel fixed between H-section columns, built as an absorptive unit so that sound is taken in at the face of the barrier as well as blocked by it.
Metal is the material that makes sense where a barrier has to span between posts without sagging, carry wind load on an exposed carriageway, and be lifted onto a structure that cannot take the weight of concrete or masonry.
A perforated metal facing, an acoustic core behind it, an internal frame that keeps the core in place, and an H-section steel column at each end carrying the panel down to the foundation. The facing takes the weather and the traffic film; the core does the acoustic work; the column takes the load.
Panel thickness, perforation ratio, cavity depth and column spacing are not fixed catalogue numbers. They are set against the noise contour and the wind load of the specific alignment, which is why the same visual barrier can be specified two different ways on two different roads.
NRC: 0.85
NRC stands for Noise Reduction Coefficient. It is the average sound absorption of the panel measured across four octave bands between 250 Hz and 2 kHz, expressed from 0 to 1. A rating of 0.85 means the panel absorbs most of the sound energy that reaches its face rather than reflecting it back into the road.
This is the figure that separates an absorptive metal barrier from a plain reflective steel panel, and it is the reason the facing is perforated rather than solid.
Absorption matters most where a barrier faces another barrier, a retaining wall or a building across a narrow corridor. A reflective panel sends sound bouncing across and along the carriageway; an absorptive one does not. It is also what stops noise being redirected to the residents on the far side of the road, which is a common complaint after a reflective barrier goes up.
STC: 29
STC stands for Sound Transmission Class. It rates how much sound passes through the panel itself, from one side to the other. A rating of 29 describes a panel that blocks airborne sound well enough for roadside service while staying light enough to hang on steel columns.
Transmission is only part of the job. A panel with a high transmission loss but no absorption still lets sound travel over its top edge and reflect around it.
Neither NRC nor STC is a promise about decibels at a house. What a resident actually hears is the insertion loss of the whole installation, which depends on barrier height above the source, distance, ground conditions, the spectrum of the traffic, and whether the run is continuous.
The same panel can measure differently on two sites. We quote against the acoustic requirement and the alignment, not against a single headline number.
BENEFITS OF HEBEI JINBIAO HIGHWAY METAL NOISE BARRIER
Four things decide whether a highway barrier still works five years after handover, and the panel is only one of them.
Absorption has to be built in, not painted on. A perforated facing over a mineral core keeps working when the surface is dirty; a barrier that relies on a sealed reflective face loses nothing, but also gives nothing back to the road corridor.
An exposed viaduct loads its barrier far harder than a cutting with trees behind it. Column section, base detail and panel span are chosen for the site's wind load, not for the average.
Galvanising after fabrication protects cut edges and welds, which is where a barrier starts to fail first. Where the barrier is specified with a colour finish, the coating sits over the galvanised steel rather than replacing it.
An opaque barrier is the cheapest way to cut noise and the fastest way to make a street feel closed. Transparent panels are used where daylight or a sight line has to be preserved, usually in the upper section of the barrier where they also raise the effective acoustic height.
If you have a noise contour, a barrier alignment and a wind load, the panel specification can be set against them. That is a shorter conversation than choosing from a catalogue and hoping the numbers transfer.
Why Hebei Jinbiao is your trusted Global Noise Control Barrier supplier?
Hebei Jinbiao has been making fencing and noise control systems for 30 years, with production in Hebei and export to project buyers rather than to stock. Barrier panels, columns and fixings are made in our own plant, which is what allows a non-standard panel to be quoted without a subcontractor in the middle.
The company operates to ISO 9001 for quality, ISO 14001 for environmental management and ISO 45001 for occupational health and safety, and holds CE marking together with a factory inspection certificate and a traffic safety product certification.
Our noise barrier work includes a fully enclosed barrier at a subway station in Chile, metal louver barriers at a power station in Japan and on a road project in Indonesia, a metal barrier at a substation in Phuket, an acoustic louver for an air-conditioning plant in the Philippines, and a soundproof blanket on a Philippine railway section.
We manufacture and supply. Outside China we do not install: erection is carried out by the project's own contractor, and we supply the drawings, the panel schedule and erection guidance that the contractor works from.
Noise barrier solutions
A metal panel is one answer, not the only one. The right system depends on where the barrier stands and what has to be protected.
Absorptive metal panels for highway and rail boundaries, where the barrier must absorb as well as block.
Transparent panels in polycarbonate, for viaducts and urban sections where daylight and sight lines matter.
Combined metal and transparent barriers, the usual compromise on city elevated roads: opaque at the bottom where the noise source is, clear above.
Fully enclosed barriers for stations and depots, where the source is inside the structure.
Acoustic louvers and soundproof blankets for plant rooms, air-conditioning equipment and rail sections where a full barrier has no room to stand.
If a project needs a configuration that is not on this list, it is usually a variation of one of them rather than something new.
H STEEL COLUMN
The column is an H-section steel post, hot-dip galvanised after fabrication, with a base plate set into the foundation and a connection at the head that carries the panel.
Column size and spacing follow the wind load of the site and the span the panel can carry, so the same panel can sit on a lighter post in a sheltered cutting and a heavier one on an exposed bridge. The column is also what sets the barrier height, which matters more to insertion loss than any single material choice.
Featured Project Case Studies
Explore real-world examples of how our comprehensive services and solutions have delivered exceptional results in isolation and acoustic applications.
Philippines Railway – Soundproof Blanket
For a Philippine railway project Hebei Jinbiao supplied soundproof blankets: green coated fabric panels laced to a steel frame in bays, used where a rigid barrier cannot be built. Light enough to be carried and hung by hand, they suit a live railway where the work has to happen in short possession windows.
Philippine AC Unit – Acoustics Louver
For air conditioning units in the Philippines Hebei Jinbiao supplied acoustic louver banks assembled over rooftop condensers. The louver has to reduce the plant noise without starving the condenser of air, so free area and face velocity are set against the unit's own airflow rather than chosen from a catalogue.
Japanese Power Station – Metal Louver Noise Barrier
For a Japanese power station Hebei Jinbiao supplied a dark metal louver noise barrier carried on galvanised posts and set on individual concrete pad footings, returning around two sides of the equipment compound. The louvered face controls noise without closing off the airflow the plant needs.
Chilean Subway Station – Fully Enclosed Noise Barrier
For a Chilean subway station Hebei Jinbiao supplied a fully enclosed arched noise barrier over the works area: green coated steel arches with solid side panels and translucent roof panels. Closing the top removes the diffraction path a free-standing barrier leaves open, at the cost of raising the level inside the enclosure.
Sub Station Phuket 3 – Metal Noise Barrier
For Sub Station Phuket 3 in Thailand Hebei Jinbiao supplied a metal noise barrier with rock wool infill around the transformer yard. Substation noise is tonal and low-frequency, so the barrier is specified for mass and height rather than for a perforated absorptive face.
Indonesia Road Project – Metal Louver Noise Barrier
For an Indonesian road project Hebei Jinbiao supplied galvanised metal louver noise barriers with rock wool infill. The louvered face sheds monsoon rain instead of trapping it, and the galvanised finish suits a hot, humid site where a painted face would need recoating sooner than the structure needs replacing.
