What it is and when to use it. A community sound barrier is the standard engineering answer to noise complaints from residential estates, schools and hospitals that face arterial roads, elevated viaducts or railways — and since China's Noise Pollution Prevention and Control Law took effect, it is also the remedy local authorities prescribe when boundary monitoring exceeds limits. HANWEI community barriers deliver Rw ≥ 28 dB with an NRC ≥ 0.85 absorptive core, and low-floor residents close to the road typically gain 5–15 dB(A) of relief. Heights run 2.5–5 m according to the floor distribution of the protected buildings, and a mid-band of 10 mm transparent PC keeps daylight and sightlines where residents need them.
Three coordinations that make or break a community project. Landscape: post colors are powder-coated to match the estate's walls and railings, and transparent sections preserve garden views. Utilities: inside a community the ground is crossed by water, gas, power and telecom lines, so we enforce trial pits before any foundation work and shift post positions rather than force through — on one viaduct-side project a trial pit exposed an unmapped medium-pressure gas main, and moving the foundation line 1.2 m cost nothing compared with striking it. Residents: beneficiaries are the roadside stack while inner-stack residents worry about blocked light, so we publish the rendering, the predicted values and the height at the owners' committee stage and tune the transparent ratio by consensus. Projects that publish before building essentially never fight about daylight afterwards.
Engineering basis. Boundary targets follow GB 3096 — Class 2 (60 dB day / 50 dB night) for residential areas, Class 4a (70/55) for roadside facades — with indoor levels referenced to GB 50118 bedroom limits. We predict per floor and per building: a 3 m wall helps low floors most, and high floors still exceeding the limit are told honestly what a taller or extended screen would and would not achieve. Where the source is a railway, the panel structure is upgraded to the railway fatigue standard; where it is an elevated road, bridge-deck reflections are accounted for in the prediction.