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Mesh Fence
Mesh Fence
In 2011 Hebei Jinbiao supplied the galvanised chain link fencing for a rail corridor in Singapore. The boundary runs beside a drain reserve and a maintenance path, with the fence carrying the perimeter line above the inspection route.
Our scope was the manufacture and supply of mesh, posts, barbed wire and clamps to the project specification. Erection was carried out on site by the project's own contractor.
Chain link mesh at 50 x 50 mm aperture, 2.5 m high, with tension wire reinforcement along the run
Hot-dip galvanised steel wire and posts
Cranked posts carrying barbed wire extensions above the mesh line
Tamper-resistant clamps for fixing mesh to posts
Angled and stepped sections to follow changes in ground level along the corridor
Assembly guidance documentation for the installing contractor
Inspection records issued at dispatch
Three things drive the detail on this project, and all three are visible in the photograph.
The post is cranked rather than straight. The top of each post is bent away from the vertical, so the barbed wire sits offset from the mesh line instead of directly above it. That changes what the fence offers to someone standing outside: there is no flat top to rest a ladder against and nothing at the top edge to grip.
The line has to follow ground that does not stay level. Rail boundaries track drainage, cable routes and level changes, so this run used stepped and angled sections rather than a single straight span. A straight run over uneven ground leaves gaps at the bottom, and the bottom gap is where a boundary fence actually fails.
Maintenance access sits inside the fence, not outside it. The drain and the inspection path in the photograph are within the perimeter, which means the fence has to leave that route usable: posts clear of the path, mesh base set high enough that debris does not collect against it, and the line broken with gates where the crew needs to get in.
Singapore is a hard case for galvanising: high humidity all year, heavy monsoon rain, strong sunlight and salt in the air along the coastal stretches. Buyers in the region price a fence on whether it is anti-rust, and the honest answer is that the zinc decides it — not the colour, and not the wire diameter.
Two details fail first in this climate. The bottom of the mesh, where grass and silt hold moisture against the wire, and any cut end or site weld left bare. Zinc applied to the wire before the mesh is woven or welded stops at the cut, which is why a hot-dip finish applied after fabrication is worth specifying on a boundary expected to stand for decades.
This project ran 2.5 m of chain link at 50 x 50 mm aperture. Two and a half metres puts the top of the mesh above a comfortable handhold, and a 50 mm aperture is small enough that a boot cannot be pushed through it to climb. Larger apertures cut cost and let more light through, but they also give a foothold.
Because height on its own is a poor deterrent. A taller flat-topped fence is still a ladder problem, and the extra panel area has to be paid for and braced. Cranking the post and adding barbed wire changes the top profile instead: the wire is offset from the mesh, so there is no edge to work from, while the mesh itself stays at the height the specification called for.
Yes, and it should. Corridor boundaries rarely sit on one level, so sections are stepped or raked to follow the ground line. The detail worth avoiding is a straight run with the bottom gap left unfilled — that gap is where people and animals get through, and it is the single most common failure on a long boundary.
By the zinc and by the details. Specify the galvanised coating by mass per unit area rather than by name, keep the bottom of the mesh clear of soil and vegetation, and touch in every cut end and site weld. Salt load is higher on the coastal stretches, so the same fence that lasts inland will not last as long on the seaward side.
It has to sit inside the corridor without blocking it. Posts go clear of the inspection route, the mesh base is set so silt and debris do not collect against it, and where the drain reserve needs access the line is broken with a gate rather than left open. Get this wrong and the result is vegetation growth against the mesh and a fence that maintenance crews cut through to get past.
The project's own contractor, as on our other overseas projects. Jinbiao manufactures and supplies; we do not provide installation outside China. What we do provide is the assembly guidance documentation and the dispatch inspection records the contractor needs in order to erect and hand over the fence.
Yes. Gate leaves are supplied to the same specification as the run and hung on their own posts, because a gate hung on a line post will sag. Width is set by what has to pass through — a pedestrian gate and a vehicle gate are different post sections, and both should be in the specification from the start rather than added after the line is set out.
Mesh is rolled and bound, posts are bundled, barbed wire travels in coils and clamps go into crates so nothing is lost in unloading. The sea leg from Chinese ports to Singapore is short compared with Europe or South America, and the cargo is bulky rather than heavy, so the container fills by volume rather than by weight.
Send the boundary length, height, aperture, wire and coating specification, post type, whether barbed wire is required, gate positions and the destination port, and we will come back with a material schedule and price. Jinbiao has manufactured fencing since 1990.
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