Bridge edge protection – safety nets at the bridge deck edge
Construction, expansion, and renovation of civil engineering structures—such as bridges, viaducts, flyovers, or underpasses—differ from any other construction site in one fundamental aspect: there is active traffic or an open void beneath the work area. Formwork assembly, edge slab reinforcement, and concreting occur directly above open space, rivers, railway tracks, or live roadways. Therefore, bridge and viaduct fall protection must solve two critical problems at once: prevent workers from falling off the deck edge and prevent tools or debris from dropping onto the traffic below. Standard perimeter guardrails only solve the first problem. Bridge safety nets mounted on brackets below the slab edge solve both. At AITANA SAFETY, we design and supply specialized Collective Protection Equipment (CPE), including certified bridge safety nets and perimeter edge protection systems (RAND+ and RAND EXTRA). Our solutions eliminate fall hazards for personnel working on the deck while safeguarding the zone beneath the structure from falling objects and construction materials.
Four challenges on bridge projects to solve simultaneously
Work on civil engineering structures differs significantly from standard building construction. When selecting a collective protection system for a bridge or viaduct, site managers and OHS specialists must account for several unique factors:
- Complex geometry and large slab cantilevers: Bridge deck slabs often feature wide overhangs (cantilevers extending 2 to 3 meters beyond the main girder or beam), making traditional clamp-on edge guardrails impossible to install.
- Double hazard zone: Protection must safeguard rebar workers and carpenters above, but also road, rail, or river traffic below (protecting against falling concrete rubble, tools, and formwork components). Closing road lanes or railway tracks under a bridge is usually the most expensive item on a project schedule. Edge protection that requires blocking traffic lanes underneath during installation ceases to be cost-effective, regardless of the hardware price.
- Infeasibility of personal harnesses (PPE): Using harnesses and lanyards along bridge deck edges severely restricts worker mobility and slows down installation works. Furthermore, in a fall over an unprotected edge without a catch net, the worker risks striking the underside of the structure or concrete piers.
- Drilling restrictions: On existing or historical bridge structures, any intervention in the slab may be ruled out altogether or may require complex engineering approvals.
Together, these four constraints eliminate most standard safety options. Net-based edge protection remains the ideal solution—lightweight, top-mounted, and easily relocatable as work advances. We detail the core hardware on our steel hall edge protection page; this page focuses specifically on bridge and viaduct applications.
Deck edge protection – how it works on a bridge
The RAND+ system consists of steel support brackets fixed to the bridge supporting structure (under the slab), combined with an EN 1263-1 certified safety net. A worker losing balance at the bridge edge lands into the net, rather than past it. The bottom edge of the net is tensioned to the anchorage points using high-strength webbing straps 50 kN webbing straps, leaving zero gap between the slab edge and the net.
- Crane-free installation: Steel brackets and custom-fitted nets are lightweight enough that all assembly and dismantling tasks are performed manually by site crews.
- Bracket spacing up to 7 meters: Wide bracket spacing minimizes the number of attachment points needed at height, saving significant elevation lift time.
Protecting traffic below the structure
When working on a bridge, hazards include not only human falls, but also anything that can drop through gaps between spans or over the deck edge: hand tools, formwork wedges, concrete fragments, or bolts. Bridge protection operates on two complementary levels:
- Primary safety net (100 mm mesh): Catches objects larger than the mesh size, covering the vast majority of items that fall during deck construction.
- Fine-mesh overlay: Where small debris, concrete chips, or small tools pose a risk to live traffic, the primary net is overlaid with a dense debris mesh. Learn more about this setup under falling object protection.
For project owners, the economic benefit is direct: with protected voids, traffic beneath the bridge can continue safely without costly lane closures or detours.
For cantilevers exceeding 2 metres – RAND EXTRA EDGE PROTECTION system
Standard edge protection assumes brackets can be attached reasonably close to the slab edge. For bridge structures with extreme slab cantilevers (where top access is restricted or the deck overhang is exceptionally wide), we deploy the advanced RAND EXTRA EDGE PROTECTION system. This engineered system is designed specifically for bridges with slab cantilevers up to 3 meters.
Adjustable upper and lower telescopic arms (MV-004 and MV-005) are anchored using mechanical anchors directly into the web or flange of the bridge girder (e.g. box girders or I-beams). This structure positions the vertical post and safety net directly along the outer edge of the cantilevered slab, maintaining bracket spacing up to 5 meters.
Custom viaduct protection – Tailored Engineering for every bridge
No two civil engineering structures are identical. They differ in slab overhang, fascia formwork, precast beam spacing, underside access, construction phasing, and drilling permissions. That is why AITANA SAFETY does not supply rigid off-the-shelf catalog kits.
Our engineering process follows a structured path:
- Plan analysis: Our engineering team reviews the structural drawings and construction schedule before issuing a quote. Bracket spacing and anchoring methods are derived directly from the bridge geometry.
- Custom bracket design: We design dedicated anchor brackets and clamps tailored to the exact beam or slab cross-section.
- Pre-concreting anchor placement: We coordinate with the main contractor to position cast-in anchor sockets prior to pouring concrete—the most economical phase to integrate anchorages.
- Custom net tailoring: Nets are custom-stitched to match exact span lengths.
This tailored approach allows viaduct protection and bridge netting to be mounted seamlessly on mobile formwork carriages, structural steel beams, or finished fascia edges.
Standards and Legal Compliance – Which Standards Apply to Bridge Edge Protection?
Bridge edge protection brings together two complementary European standards:
- EN 13374 – Temporary edge protection systems: Governs structural load requirements for support posts and brackets.
- EN 1263 – Safety nets: Governs the netting panel itself. We utilize 100 mm mesh nets in configurations corresponding to System S netting. Manufacturing criteria are defined in Part 1, and installation rules in Part 2. Explore details under System S safety nets page.
Testing and certification data
The RAND+ system underwent dynamic load testing for Class C compliance under Clause 7.5.2 of EN 13374:2013 at the AIDICO Safety Testing Laboratory in Spain (ENAC Accreditation No. 25/C-PR226):
- Test method: A 75 kg test mass was released on a 60° inclined plane, striking the net system after a 5 m drop.
- Impact energy: 3,200 Joules at the moment of contact.
- Impact sequence: Four consecutive drop impacts were executed (two between support brackets and two directly onto a bracket) without replacing or repairing any component between drops. After each impact the test body remained in contact with the system for at least three minutes.
Result: The system successfully arrested the test mass in all four impacts, with maximum dynamic deflection measuring 1,800 mm on the first impact and 1,265 mm on the second. The laboratory report confirmed that energy absorption was distributed across the entire assembly—both the net and the steel brackets. The recording of the test and a full description of the system can be found on our page about steel hall edge protection.
Whatever the standards say, an overriding principle applies, set out in European Directive 89/391/EEC: collective protection equipment takes absolute priority over personal protective equipment. On a bridge, this principle has a double impact: harnesses protect the individual worker, but only a catch net protects the traffic passing underneath.
FAQ – Frequently asked questions about protecting bridge structures
Does a bridge safety net also protect against falling tools hitting traffic below?
A standard 100 mm mesh safety net catches workers and large formwork timber. To protect live traffic lanes underneath against small tools, concrete spalls, or debris, the primary net is overlaid with a fine-mesh debris net.
Does installing the RAND+ system require drilling into the bridge deck?
Not if planned in advance. On new bridge builds, anchor sockets are cast directly into the concrete slab prior to pouring. On existing structures, mounting clamps are engineered around the beam profile without drilling into the deck.
Can bridge edge protection be relocated as construction works progresses?
Yes, this is a primary advantage of the RAND+ system on linear infrastructure projects. As bridge deck construction moves span by span, support arms and nets are dismantled and re-erected manually without crane assistance. Contractors only purchase enough equipment for active work fronts and advance it along the bridge.
How are bridges over live highways or railways protected during repairs?
System components are installed from the top deck or underslung work platforms without occupying live traffic lanes underneath. Because all parts are manually maneuverable, installation can be performed during scheduled traffic windows or off-peak hours.
Does installing RAND+ system interfere with rebar tying or deck concreting?
No. Support brackets and arms attach to the outer face or underside of the slab cantilever, leaving the entire top surface of the bridge deck completely unobstructed for steelfixers and concreting crews.
Planning work on a bridge structure?
Are you preparing the construction, widening, or repair of a bridge, viaduct, or elevated flyover? We will help you select a compliant, cost-effective collective protection system (CPE) tailored to your bridge geometry. Contact our engineering team with your structural drawings and schedule to receive a customized edge layout and quotation!
Bridge protection is one component of our complete range. You will find the full picture – the four net systems of EN 1263, edge protection systems and protection against falling objects – in our guide: safety nets as collective fall protection.