求教这几个符号的含义，能不能详细描述一下
盾构机上面的图纸看不懂这几个符号，求教大指导一下
https://www.iyeya.cn/forum.php?mod=image&aid=70177&size=300x300&key=4ed03ff0c6cb1f53&nocache=yes&type=fixnone
https://www.iyeya.cn/forum.php?mod=image&aid=70178&size=300x300&key=8a02d454a3a0f8a0&nocache=yes&type=fixnone
https://www.iyeya.cn/forum.php?mod=image&aid=70179&size=300x300&key=9c25e60bb0115962&nocache=yes&type=fixnone
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