Every article in this series so far has been about closing a line – creating a continuous high-security fencing barrier that resists cutting, climbing, levering and tampering along its entire perimeter. A gate is the opposite proposition. It is a deliberate gap in that continuous line, positioned at one of the busiest points on the site, sized to admit vehicles and personnel, and required to open and close hundreds of times a week for decades.
It is the one intersection on the perimeter where the barrier is designed to open on command- and, unsurprisingly, one of the places where the perimeter is most frequently tested.
In this article, Cochrane Global explores how security gates can be engineered to maintain the performance of the fence they interrupt, and how sliding, cantilever, bifold, swing and pedestrian configurations meet different operational requirements.
Why the Gate Is Where Perimeters Get Tested
Gates harbour risks for reasons that have little to do with how well they are made. They are the only element of the perimeter that moves, introducing sliding components, wear and failure modes the fence does not have. They are also the point at which legitimate traffic and hostile intent can enter through the same aperture, requiring the site to distinguish between them in real time. When you add access control, electronics and power into the busy equation, the entrance becomes one of the most operationally complex parts of the perimeter protection system.
A gate that is weaker than the fence around it is not simply a gate problem. It is a perimeter problem because the perimeter is now only as strong as its weakest gate, which breaks its chain. Breach resistance, anti-climb features, anti-cut resistance and detection coverage need to continue across the opening, or the wider security specification has quietly defeated itself.
Security Gates Should Be the Fence, Interrupted – Not a Different Product
The core principle Cochrane Global applies to gate design is continuity. A gate leaf is built from the same 358 mesh security fencing as the fence, with matching aperture geometry that resists cutting tools and denies useful finger and toe holds. It carries the same Marine Fusion Bond coating, helping the gate and fence weather consistently over their service life. It can also accommodate the same security fence toppings, maintaining protection against climbing across the opening as well as along the fence line. This consistency matters beyond physical security. A gate that looks and performs like a separate component can create a visible interruption in an otherwise integrated perimeter.
The visual continuity matters too. A ClearVu Invisible Wall gate allows the fence line to extend across the entrance rather than appearing as separate gate hardware inserted into a gap. Transparency is maintained, allowing patrol guards and surveillance systems to retain sightlines through the entrance – arguably one of the most important places on the site to see what is approaching.
Choosing the Right Security Gate Configuration
Cochrane Global manufactures a range of security gate configurations to suit different entrances, traffic profiles, ground conditions, cycle frequencies and available space, and built to exact client specifications and risk requirements
Sliding gates run on a ground-mounted track and provide a mechanically straightforward solution for wide openings and frequent operation. They require level run-off space alongside the entrance and a track that can be kept clear.
Cantilever gates suspend the leaf above the opening, eliminating the need for a ground track. This makes them particularly useful where uneven ground, drainage or heavy vehicle traffic makes a track undesirable, although the counterbalanced design requires additional run-off space.
Bifold gates fold as they open, reducing the lateral space required and allowing the entrance to clear more quickly. At high-throughput or higher-security entrances, that faster cycle can reduce the time for which the perimeter is open and help limit opportunities for tailgating.
Swing gates remain a practical solution for narrower openings and lower traffic volumes where sufficient clear arc space is available.
Pedestrian security gates face a different operational demand. They typically cycle more frequently, carry access-control hardware used by staff every day and need to provide convenient authorised access without compromising the breach, climb and cut resistance of the surrounding perimeter.
Where standard configurations do not suit the site, Cochrane Global’s innovative engineering approach allows custom security gates to accommodate unconventional spans, unusual geometry, existing structures, architectural requirements or specialised traffic profiles. As with the wider design of ClearVu, the objective is to integrate security performance, engineering and appearance rather than treat them as separate requirements. The entrance can therefore be designed around the site’s operational and security requirements rather than around a standard gate format.
Access Control – Deciding Who Comes Through
High-security fences answer a relatively simple question: is this line closed? A gate answers a more difficult one: should this person, in this vehicle, at this moment, be allowed through?
That is an access-control question, and the gate is where the answer is implemented.
Cochrane’s gate systems can integrate with biometric readers, card and fob readers, ANPR cameras, intercoms, induction loops, barrier arms, turnstiles and other access-control technologies. As with PIDS integration along the fence line, the customer can select the access-control technology suited to the site and its broader perimeter security requirements. The gate provides the structural and electrical infrastructure without dictating the technology mounted to it.
The cabling discipline follows the same principle as the fence line. Power and signal runs can be routed within the post-and-gate structure rather than surface-mounted, where they are more susceptible to cutting or tampering from the approach side.
What a Security Gate Has to Survive That a Fence Does Not
Specifying a gate properly means considering failure states that a static fence does not face.
What happens during a power failure – does the gate fail open or fail closed, and which does the site require? Can it still be operated manually if the motor fails? What happens following a vehicle impact? Where vehicle-borne threats form part of the site’s risk profile, dedicated anti-vehicle barriers may also form part of the entrance security strategy. Additionally, site owners should ask themselves: how many operating cycles will the mechanism complete each year, and is it rated for that duty? Can maintenance be carried out from the secure side?
These questions rarely arise with static fencing because the fence does not move. They belong in every security gate specification, however, and the answers determine whether the entrance is still working properly in year fifteen or has quietly become the thing everyone on site has learned to leave propped open.
The Opening Is Still Part of the Perimeter
Even a custom-engineered perimeter can be compromised by a gate treated as an afterthought – a different product, supplied to a different standard and inserted into the gap where the fence stops.
Security gates, fabricated as part of the wider perimeter security design – using compatible materials, coatings, security toppings, cable discipline and visual language – are not just an opening in the perimeter. They are the focal point of the perimeter – built to open, engineered not to fail.
To discuss which security gate configuration suits your entrance – sliding, cantilever, bifold, swing, pedestrian, or a custom perimeter security solution tailored to your site’s specific constraints – speak to your nearest Cochrane Global office today.
The gate may be the one part of the perimeter you have to open on purpose, but it should never leave your security open to question.
