Enlarging head manner null of enlarging head circular arc post and circular arc

摘要

PURPOSE:To increase supporting force without widening a diameter of the end of a pile by inserting a steel pipe of which a pile head section of a circular arc pile is formed, placing concrete between the steel pile and the circular arc pile, and welding the head section together as a unit to widen the head section. CONSTITUTION:A circular arc pile 3 is constituted of a steel pipe 4 and concrete 5 placed thereinto. While guiding a guide section 13 of an end driving type drill 12 of a curved internal pipe 11, concrete is placed in the steel pipe 4 placed to a specific position to complete the circular arc pile 3 while excavating the ground with a pilot bit 15 and a retract bit 16. After that, a reinforced cage 9 is inserted into a mouth through a steel pipe 7 to place concrete 8, and a circular steel plate 10 is welded together as a unit after the solidification to widen the head section. In that way, the pile 3 is formed in the shape of a circle, and ground reaction force and circumferential frictional force are increased to enhance supporting force. According to the constitution, the supporting force can be enhanced without widening a diameter of the end section of the pile 3.