LOAD TESTING OF PILE

PURPOSE:To make the load testing of a pile easier by a method in which a tube sheathed on a pile is fixed to the ground, and a downward load is applied to the pile by the peripheral frictional force as a reaction force of the tube by means of a jack set between the upper end of the pile and the tube. CONSTITUTION:A pit 2 is excavated in the ground G by an earth auger, a footing protection liquid (a) is packed to the downside of the pit 2, and a peripheral solidifying liquid (b) is injected. A test pile 3 with a tube 4 sheathed on the pile 3 is penetrated into the pit 2 in a state of being connected integrally, whereupon both the liquids (a) and (b) are pushed up. A tube 7 attached to the lower end of the tube 4 is then expanded and contacted with the periphery of the pile 3 and the inner surface of the pit 2. A beam 8 is fixed to the upside of the tube 4, a jack 9 is set between the beam 8 and the upper end 3b of the pile 3 and operated, and downward loads are applied to the pile 3 by peripheral frictional forces as reaction forces of the tube 4.