According to the analytic results, it shows that the effect of prestressed FRP sleeve of strengthening concrete column is superior to that of the ordinary FRP materials.
分析结果表明，预应力的FRP套筒补强混凝土柱的效果明显高于一般的FRP材质。
2
When the button is pointed again the slide tooth column, the rotating tooth ring and the slide tooth sleeve return because of spring.
当再次按钮点动滑齿柱转齿环和滑齿套因弹簧上升复位。
3
Based on the main structure of the erect sleeve washer, it installs a hollow column in the center of the inner tank.