The post everyone forgets carries everything
In barrier projects, attention goes to the panels — how many decibels, what color — while the post gets barely a glance. Yet the post is what decides whether a barrier stands: panels only hang on it, while the post alone resists the wind pressure on every square metre, the full panel weight, and years of wind-induced fatigue. A failed panel degrades performance; a failed post is an accident. Highway barriers are blown over somewhere almost every year, and the post-mortem usually finds an under-sized section, a thin zinc coat, or an anchor detail that never matched the load. We build complete barriers, so our post standard equals our panel standard: hot-rolled H-sections cut full-length (Q235B, Q355B for heavy duty), flange plates and triangular gussets jig-welded in the shop with welds accepted to GB 50205, and whole-member hot-dip galvanizing to GB/T 13912 at 85 μm average — rust-free for 25 years in ordinary atmospheres. Sections H100×100 through H250×250 from stock, standard spans 2~2.5 m, special spans and heights calculated to order. Posts alone or posts with panels, each delivery carries the material certificate and zinc-coating report. Hotline +86 18831881133.
Sized by wind, not by appearance
Post selection is a structural calculation, not a feeling. Three loads combine: panel wind pressure (per GB 50009 at the site's basic wind pressure — 0.8~1.0 kN/㎡ in typhoon-prone coastal zones, 0.4~0.6 kN/㎡ inland), panel dead weight, and construction loads; the combination gives the moment at the post base. The moment fixes the section: the same 2.5 m barrier takes an H125×125 inland but may need an H175×175 on the coast, with spans tightened from 2.5 m to 2 m — same panels, more posts. Deflection closes the check: top movement under wind is limited to 1/200 of post height, because a flexible post twists the panel slots until they rattle or release. Every complete barrier we quote carries this calculation, and we run it free for post-only buyers — send barrier height, span and the project city, and the selection sheet comes back with the numbers shown.
Galvanizing is the floor, not a feature
A post's life is its coating's life. Barrier posts live outdoors permanently; paint-only protection starts staining rust within three years in humid, salty or de-icing-salt environments, and the white rust streaks down onto the panels ruin the whole barrier's face. We galvanize the whole member: after pickling, the steel is immersed in molten zinc so the coating bonds metallurgically — corners, welds and internal cavities included — at 85 μm average per GB/T 13912's severe-exposure class, maintenance-free for 25+ years. Coating thickness is measured, not sprayed on: every batch ships with a zinc-thickness test report, verified by magnetic gauge sampling. Heavy-industrial, coastal and de-icing-salt sites move to 100 μm+ or a duplex galvanizing-plus-fluorocarbon system for 30 years. One more detail most suppliers miss: the flange face against the concrete sits permanently damp and rusts first — ours get extra-thick zinc or a bituminous coat underneath.
Precision: a post 1 mm off costs an afternoon
The post is both structure and setting-out: each panel's two side slots must engage two neighbouring posts at once, and a pitch error over 3 mm means the panel does not fit — so the fitters cut it with an angle grinder, and the cut edge rusts from the day it is made. We control precision in the factory: base-plate holes CNC-drilled to ±1 mm against the anchor setting-out drawing, flange faces machined flat (an uneven flange twists the post as the bolts tighten), slot spacing reverse-engineered from measured panels, and the finished member straightened after welding. On site the kit is complete — anchor bolts, positioning template, levelling nuts — the embedments cast true off the template, and after erection each post is levelled, torqued and checked for verticality within 1/500 of height. For retrofits reusing existing anchors, measure the old bolt pitch and send it: the base plate is drilled to match the field, not the drawing. Drawings and reality never agree on retrofit projects — we measure the reality.
Three failures we have seen, so you do not repeat them
Sized by gut, flattened by wind. A campus barrier built on light posts "to save a grade" lost forty-odd posts in one force-10 gust; the repair and re-panelling cost ten times the saving. Take the wind pressure from the table. Zinc at 40 μm, rust at year three. The low-bid posts measured less than half the required coating; by year three the streaks ran down every panel and the owner refurbished the whole line. 85 μm is the floor — bring a thickness gauge to acceptance. Slots 5 mm apart from the panels. Posts and panels from two suppliers, both "per drawing", cost three hundred cut panels on site and a rust creeping from every cut edge a half year later. One source for posts and panels, slots reverse-engineered from the panels — that is how we deliver.
Selection in three steps
Section: barrier ≤ 3 m in ordinary inland wind, start at H125×125; 3~5 m or coastal, H150×150~H175×175; above 5 m or typhoon zones, H200×200 and up with the foundation re-checked. Span: 2~2.5 m standard; 2 m close pitch where the streetscape matters — denser posts can be lighter. Base: flange + anchors for new builds (level-able, replaceable); embedded type where the check is tight or the soil is poor. Send barrier height, span and city; the selection sheet with local wind pressure comes back the same day, with certificate samples attached. Hotline +86 18831881133.