Cave cutting method for pillar construction

Abstract

The present disclosure is a method for excavating a pole erection hole, including step 1 of suspending a vibrator to which a cylindrical casing tube is attached and disposing the vibrator on a surface of a ground, step 2 of vibrating, by the vibrator, the casing tube to cause the casing tube to penetrate into the ground, and step 3 of stopping vibration of the vibrator when the casing tube penetrates to a predetermined depth.

1 . A method for excavating a pole erection hole, comprising:
 step  1  of suspending a vibrator to which a cylindrical casing tube is attached and disposing the vibrator on a surface of a ground;   step  2  of vibrating, by the vibrator, the casing tube to cause the casing tube to penetrate into the ground; and   step  3  of stopping vibration of the vibrator when the casing tube penetrates to a predetermined depth.   
     
     
         2 . The method for excavating a pole erection hole according to  claim 1 , wherein
 in the step  2 , vibration of the vibrator is stopped when the vibrator detects contact with a buried object.   
     
     
         3 . The method for excavating a pole erection hole according to  claim 2 , wherein
 the vibrator detects contact with a buried object when the vibrator detects a pressure in a vertical direction larger than a predetermined value.   
     
     
         4 . The method for excavating a pole erection hole according to  claim 2 , wherein
 the vibrator detects contact with a buried object when the vibrator detects a penetration speed smaller than a predetermined value.   
     
     
         5 . The method for excavating a pole erection hole according to  claim 1 , further comprising
 step  4 A of lifting soil inside the casing tube together with the casing tube and discarding the soil after the step  3 .   
     
     
         6 . The method for excavating a pole erection hole according to  claim 1 , further comprising
 step  4 B of stirring, sucking, and discarding soil inside the casing tube after the step  3 .   
     
     
         7 . The method for excavating a pole erection hole according to  claim 1 , further comprising
 step  4 C of connecting a utility pole to an upper surface of the casing tube after the step  3 .