Tunnel deformation observation mark

A tunnel deformation observation mark comprises an anchoring section, an observation mark section and a connecting sleeve. The anchoring section is fixed in the primary support shotcrete; the anchoring section is mechanically connected with one end of the connecting sleeve; an observation mark is welded at the other end of the connecting sleeve; after tunnel primary support concrete spraying is completed, only the observation mark part is mechanically disassembled when drilling, deformation observation mark installation and observation mark disassembly are conducted at the design position of the deformation observation mark, the deformation observation mark is easy to machine, low in cost and rapid in construction, disassembly and installation, and the quality and potential safety hazardsof conventional construction are reduced. 一种隧道变形观测标，包括锚固段，观测标段和连接套筒。锚固段固定于初期支护喷射混凝土内，锚固段与连接套筒一端机械连接，连接套筒另一端焊接观测标，隧道初期支护喷射混凝土完成后，在变形观测标设计位置进行钻孔，安装变形观测标，观测标拆除时，只机械拆卸观测标部分，此种变形观测标加工简单，成本低廉，施工拆除安装快捷，减少了常规施工的质量和安全隐患。