COMPOSITE CAST IN PLACE PILE METHOD USING PARTIALLY EXPANDING APPARATUS FOR UNDERGROUND PIPE

摘要

In the present invention, the ejection port 21 is formed and the pressure conveying pipe 41 connected to the ejection port 21 is built-in to move the moving body 20 inside the tube body 10, and at both ends of the moving body 20 An underground pipe body part expansion device consisting of a sealing body 30 that is formed to seal a partial section of the pipe body 10, and an on-site synthetic pile construction method using the same, and expands the underground pipe body part into the pipe body 10 penetrated into the ground. After the device is put in, it is operated to form an enlarged diameter part 11 in the tube body 10. Through the present invention, it is possible to build a solid coupling structure between the pile and the ground by forming irregularities on the outer circumferential surface of the on-site synthetic pile, thereby significantly improving the supporting power of the pile.