| 摘要 |
PURPOSE:To raise the drawing resistance of anochor rods by a method in which an anochor rod having u-and reverse u-shaped notches on its wall and a closing metal on its tip end opening is covered with a heat-shrink tube and penetrated into the ground, and an expandible material is injected from the end opening of the anochor rod. CONSTITUTION:An anchor rod A covered with a heat-shrink tube 7 is driven through its closing metal 6 into a banking 10, and then an expandible material 11 is injected through the rear end opening 1b of the rod A until it reaches the positions of notches 2 and 3. The expandible material 10 injected expands and hardens to produce a maximum expansion pressure after the lapse of about 12-24hrs, whereby the u-and reverse u-shaped tongue pieces 5 and 4 break the heat-shrink tube 7 and erect. Thus, the anchor rod A is given a high bearing force by the tongue pieces 4 and a high drawing resistance by the tongue pieces 5. |
