What Entrance Piers Actually Carry
The Pier Is Usually Cladding
A brick or stone pier at an estate entrance reads as a solid column of masonry holding up a heavy gate. In most well built installations it is not doing that at all. Inside it there is a steel post on its own footing, and the masonry is built around that post. The gate hangs from the steel; the pier gives it the appearance it needs and protects the steel from view rather than from load.
Why It Is Built That Way
Masonry is strong in compression and poor at resisting the repeated rotational force a gate applies every time it swings. Bolting hinges into brickwork transfers that force into mortar joints, and mortar joints lose. The steel core takes the moment down into a footing sized for it, and the masonry is left doing the job it is good at, which is standing still and looking permanent.
What Goes Wrong When It Is Not
A gate hung on anchors set directly into a pier will move. It starts as hairline cracking radiating from the upper hinge, progresses to a loose hinge plate, and ends with a section of the pier face pulling away. By that stage the repair is rebuilding the pier around a steel post that should have been there originally, at several times the original cost.
Piers Carry Services Too
The entrance is where power for an operator, cabling for an intercom, a keypad, a camera and lighting all converge, and a pier is the obvious place to run and conceal them. Conduit has to be built in as the pier goes up, because retrofitting a cable route through finished masonry means cutting it. Putting in spare conduit at that stage costs almost nothing and is repeatedly the thing people wish they had done.
Coastal Detailing
The steel core inside a pier is in a damp enclosed environment for its whole life, so its protective treatment matters more than the visible metalwork that can be inspected and touched up. Equally, a pier cap that throws water clear rather than letting it run down the face keeps both the masonry and what is inside it dry. Neither is expensive at build time and neither can be added later.