{"id":1588,"date":"2025-11-23T03:26:52","date_gmt":"2025-11-23T03:26:52","guid":{"rendered":"https:\/\/foredencnc.com\/?p=1588"},"modified":"2025-11-23T03:26:53","modified_gmt":"2025-11-23T03:26:53","slug":"bireflection-target-pin-%ec%b2%9c%eb%8b%a8%ec%b9%a8%ed%95%98%e3%86%8d%eb%82%b4%ea%b3%b5%eb%b3%80%ec%9c%84-%ed%83%80%ea%b2%9f","status":"publish","type":"post","link":"https:\/\/foredencnc.com\/?p=1588","title":{"rendered":"Bireflection Target & Pin (\ucc9c\ub2e8\uce68\ud558\u318d\ub0b4\uacf5\ubcc0\uc704 \ud0c0\uac9f)"},"content":{"rendered":"\n

Description<\/h3>\n\n\n\n
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During tunnel construction, the absolute settlement of the tunnel crown and each cross-sectional point is measured to assess the equilibrium and displacement convergence of the tunnel cross-section, as well as to understand the behavior of the surrounding ground and estimate the range of the loosened zone in adjacent soil.<\/li>\n\n\n\n
These measurements serve as fundamental data for evaluating construction stability, confirming the effectiveness of support systems, reviewing subsequent construction processes, and determining the appropriate timing for face closure.<\/li>\n<\/ul>\n\n\n
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$\"\"$ <\/figure>\n<\/div>\n\n\n
Composition & Characteristic<\/h3>\n\n\n\n
\u25a3 Components<\/strong><\/h4>\n\n\n\n
\u2460 Reflective sheet
\u2461 Fixed target
\u2462 Fixing pin<\/p>\n\n\n\n
\u25a3 Features<\/strong><\/h3>\n\n\n\n
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Targets used for optical surveying are generally divided into two types: triple prisms and refractive-type targets fitted with high-intensity reflective sheets.<\/li>\n\n\n\n
Although refractive-type targets offer lower displacement-measurement accuracy compared to triple prisms and have shorter measurement range, they allow two-dimensional measurements.<\/li>\n<\/ul>\n\n\n\n
Specification<\/h3>\n\n\n\n\n\n\n