The foundation of the doorpost of the tunnel door is generally about one meter two. Because the site gate is special, it is often used. For example, concrete mixer, material truck, brick truck, stacking truck and so on are all relatively heavy vehicles. Therefore, the doorpost foundation of the gate must be firm, otherwise it will fall off when it hits slightly, which is more troublesome. Therefore, the doorposts on the construction site are also relatively large, generally 62 plus 50 wall posts.