Corks and wine bottle corks are similar in texture, generally conical and wedge-shaped, used to deal with small breaks, and wooden wedges are also used to wedge wooden columns.
The cross section of wooden columns is square, which is generally used to strengthen bulkheads and doors, or anti-blocking equipment.
The plug cushion is like the sofa cushion we use, square and round, which is used to plug small and medium-sized crevasses with upturned mouths. If the hem is turned inward, make a prominent soft edge around it with sealing board, square board, canvas, plastic and other things. Fasten it, and then support it with wooden posts.
Large cracks need waterproof pads. They are usually made of canvas, and some of them are reinforced with steel ropes in the middle. When they are used, they cover the cracks from the outside.
There are also some plug-in devices that have their own fixing devices and do not need to be fixed with wooden posts. For example, a plug-in board has a screw in the middle and a metal strip that can be folded horizontally in front of the screw. First, put the metal strip vertically outside the breach, then cross it, buckle it outside the bulkhead, and tighten the screws to fix the sealing plate in the breach. There is also a kind of equipment, which seems to be called an umbrella. It sticks out the crack, opens the crack, and then pulls back to buckle the crack from the outside.