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建筑工地使用的井字架,一般是金属型钢、钢管搭设成,断面为井字形高耸式结构,用以垂直运输。传统井字架拉设缆绳(即缆风绳)时,要通过稠密居民点、道路、高压线和邻近建筑物而造成困难。这种井字架头重脚轻,稳定性差,若架设24m 高的井字架,则需300m 钢绳作缆绳牵牢。钢绳锈蚀较快,当折断、脱落、碰撞后会发生倒塌事故。它的架设高度呆板,搭到一定高度时,还需要用辅助缆绳拉牢才能继
Tic Tac Toe used in construction sites is usually made of metal steel and steel pipes. The cross section is a tall, well-shaped structure for vertical transportation. When a conventional rig is used to set up a cable (ie a cable winder), difficulties are caused by dense residential areas, roads, high-voltage lines and neighboring buildings. This type of derrick head is heavy and has poor stability. If a 24m-high derrick stand is erected, a 300m steel wire rope is required for the rope to be firmly secured. Rope corrosion is fast, and it will collapse when it breaks, falls off, and collides. Its erection is highly rigid, and when it reaches a certain height, it is necessary to use an auxiliary cable to secure it.