用于钻孔灌注桩施工作业，为钢材制作，圆柱状。一般为钢护筒，壁厚10mm。一般作为施工预防固定作用。护筒连接处要求筒内无突出物，应耐拉、压，不漏水。
本发明公开了一种钢吊箱与钢护筒之间的连接锚固装置。
The invention discloses a connecting anchoring device between steel suspension box and steel protecting tube.
本文介绍采用双护筒解决挖孔桩地表水渗漏问题，取得了较好的效果。
The paper introduced how to solve surface leakage of excavated pile with double protective casing and the better results have been achieved.
为此采用广角度监测技术，跟踪观测钢护筒、桩身钢筋和混凝土的应力响应。
Therefore, extensive angle monitoring is adopted to observe the structure response of steel casing, reinforcing steel bar and concrete.
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