Municipal road works fencing: the works, the lane and the trench

Three lines, three products, one order

Traffic diversion first. The lane has to move before anything else can be built, and it has to move without a fixing in the road surface. That is the tall water-filled barrier: 102 cm long, 183 cm high and 400 mm wide, 8–9 kg empty and about 100 kg filled, interconnecting end to end. The manufacturer states it withstands wind force of grade 7–8 and works between −40 °C and +60 °C, which is what makes it a temporary line rather than a permanent one. It is not a vehicle barrier in the impact sense: the crowd-control and barrier products are for separation, and the road guardrails are the products that take an impact.

The frontage, seen every day. Where the works sit on a street rather than a motorway, the public reads the site through its hoarding. The municipal hoarding puts a 220 × 300 × 0.9 mm galvanised post at each station, an 80 × 80 × 1.0 mm concealed post behind the panel joint so the 480 mm white over 400 mm grey face stays flush, and a 50 × 50 × 0.9 mm brace behind the run. Where the frontage runs along an open carriageway and the face has to breathe, the perforated hoarding uses a 1200 × 2000 mm sheet at 0.5–0.8 mm with Φ10 mm holes on a steel-tube support.

The trench is the hazard. The excavation edge guardrail is the line that keeps the crew and the public out of the open edge. In the specified build the panel is 1.1 × 1.7 m, welded from 2 cm × 4 cm square tube with 50 × 50 mm mesh and 3.5 mm wire, on an 8 cm square-tube post 1.3 m high, at 2 m post spacing, fixed with Φ14 expansion bolts through an 8 mm × 15 cm × 15 cm base flange. The page also cites the rule it works to: excavation edges of pits deeper than 2 m must be fitted with protective railings.

And the barrier that has to take the impact. Where the job needs a vehicle barrier rather than a separation line, the range splits in two and the split matters. The W-beam steel road guardrail is the standardised corrugated-beam system published against JT/T 281—2007. The road guardrail is the general road and municipal line, made to the project specification, and it quotes no JT/T figures. They are never substituted for one another.

The three lines a road works order is built from

Frontage, lane, trench. Where a fourth line is needed it is usually the impact barrier, and that is a separate decision made on the standard the barrier is written against.

• 

  Municipal Hoarding

  Post 220 × 300 × 0.9 mm galvanised tube, concealed post 80 × 80 × 1.0 mm, 480 mm white panel over 400 mm grey, brace 50 × 50 × 0.9 mm, flange plate and expansion bolts.

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• 

  Water-Filled Barrier

  Tall blow-moulded unit: 102 cm long, 183 cm high, 400 mm wide, 8–9 kg empty and about 100 kg filled, interconnecting, wind force grade 7–8, −40 °C to +60 °C.

  View product →
• 

  Excavation Edge Guardrail

  Panel 1.1 × 1.7 m on an 8 cm square-tube post 1.3 m high, 50 × 50 mm mesh, 3.5 mm wire, post spacing 2 m, Φ14 expansion bolts through an 8 mm × 15 cm × 15 cm flange.

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Site condition to recommended specification

Read down the left column for the condition on the site; the middle column is what this site publishes for it. Nothing in the table is a figure that is not already printed on a product page.

Six things to settle before a road works order

• Split the order by line, not by product. Frontage, lane and trench are three different runs with three different fixings. Counting them together is how a container arrives short of one part.
• The two road guardrails are not interchangeable. If the drawing names JT/T 281—2007 or a corrugated beam with a panel length and a post spacing, it is the W-beam product. If it shows a municipal barrier or a median unit to the authority's detail, it is the road guardrail. A beam from one is never supplied against the other's drawing.
• Say how the trench is fixed. The specified edge rail is bolted down with Φ14 expansion bolts through an 8 mm × 15 cm × 15 cm flange. If the ground will not take an expansion bolt, say so at enquiry.
• Empty barriers ship nested. Empty units nest for shipping, which is what keeps a container load compact; cartons, pallets and the exact packing method are confirmed per specification with the loading plan.
• No price is published. Price is quoted per order — FOB Wuhan / Shanghai, CIF or DDP — because it depends on the specification, the quantity and the destination port.
• MOQ, loading and lead time arrive with the specification. Send the drawing or the standard, the quantity and the destination port, and the reply carries all four within one business day.

Four things to send, and what each one decides

Five questions, answered from this site

What closes the frontage of a road works?

The municipal hoarding: a 220 × 300 × 0.9 mm galvanised post, an 80 × 80 × 1.0 mm concealed post behind the panel joint, a 480 mm white panel over a 400 mm grey one, and a 50 × 50 × 0.9 mm square-tube brace, bolted down on flange plates with expansion bolts. Where the face has to let wind through over a carriageway, the perforated hoarding does it with a 1200 × 2000 mm galvanised sheet at 0.5–0.8 mm and Φ10 mm perforations.

What diverts the traffic at a lane closure?

The water-filled barrier, in its tall blow-moulded type: 102 cm long, 183 cm high and 400 mm wide, 8–9 kg empty and about 100 kg filled with water, interconnecting end to end, and stated by the manufacturer to withstand wind force of grade 7–8 between −40 °C and +60 °C. It needs no groundwork, so a lane can be closed and re-opened without a fixing in the road.

What protects an open trench beside the route?

The excavation edge guardrail, in its specified single-panel and double-panel build: panel 1.1 × 1.7 m welded from 2 cm × 4 cm square tube, 50 × 50 mm mesh with 3.5 mm wire, on an 8 cm square-tube post 1.3 m high, post spacing 2 m, fixed by Φ14 expansion bolts through an 8 mm × 15 cm × 15 cm base flange. The page also cites the site rule it works to: excavation edges of pits deeper than 2 m must be fitted with protective railings.

Does a road works need the W-beam guardrail?

Only where the barrier itself has to be the standardised corrugated-beam system published against JT/T 281—2007: a 4320 mm panel with a net 4 m after installation, on a 4 m post spacing, twin-wave 310 mm or triple-wave 505 mm with an 85 mm wave height, in 3 mm or 4 mm plate, on Φ114 mm or Φ140 mm posts with a 4.5 mm wall. A municipal barrier drawn to the authority's own detail is the separate road guardrail product, made to the project specification and quoting no JT/T figures.

How is a road works order priced and shipped?

No price figure is published on this site. Price is quoted per order — FOB Wuhan / Shanghai, CIF or DDP — and the MOQ, loading plan and lead time are confirmed per specification. Send the drawing or the standard, the quantity and the destination port and the reply carries all four within one business day.