Mast is a secondary word in modern Chinese, which belongs to the left and right structure. A long pole erected on the deck of a ship, used to hang sails and flags or to double as a derrick post. These words include mast, mast light, mast sign and so on. Mast refers to the mast that hangs the sail.
There is a poem about the mast: "The flood can't cross the mast, brother, write it first." -"The Sixteen Biographies of Jigong".
"The mast of the rope stands in the air and the teacher sleeps in the waves." -Su Shi, etc.
The mast is the main part of the cargo lifting equipment on the ship, which is used to install the cargo lifting rod and signal equipment, and to install the antenna frame and radar frame. The types of masts are portal masts, in-line masts, single masts and tripod masts. Among them, single mast is simple in structure and strong in strength, and it is most used in ships.
Masts are classified by material:
Masts are generally divided into wooden masts and steel masts according to different materials. Steel masts are divided into tubular masts and truss masts.
1, wooden mast
Wooden masts must be made of high-quality, non-cracking, non-rotting, non-moth-eaten, few knots and straight logs, such as yellow pine, oak, locust tree and Chinese fir. Wooden masts should be carefully checked before use, and masts with serious corrosion, knife (saw) marks and cracks are not allowed to be used.
2. Steel mast
Light metal masts are generally made of pipes, and the lifting capacity is generally below 30t, and the lifting height is below 30m. Tubular masts are generally made of seamless steel pipes, and the extension of steel pipe masts can be connected by welding and segmented steel structures.