| 摘要 |
PURPOSE:To easily draw out a pile by a method in which a pile whose surface is provided with the film of hydrated water-soluble urethane polymer gel formed by spraying is penetrated into a pit before or after packing cement into the pit. CONSTITUTION:During the period when a pile 14 of H-steel is lowered into a pit 12 through the cover 20 of a sprayer 16 and the inside of a frame 18, a mixture of water-soluble urethane polymer and water is sprayed from the tip nozzle of a pipe 22 onto the surface of the pile 14 for coating. After the mixture of urethane polymer on the surface of the pile 14 is gelled, the pile 14 is penetrated into a pit 12 and an alkaline material, e.g., Portland cement, etc., is also packed into the pit 12. In drawing out the pile 14, the drawing resistance can thus be reduced by the lubricating action of the film of hydrated gel of urethane polymer since the film is changed into a greasy form.
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