Water catchment pipe burying assistance instrument and water catchment pipe burying method employing same

A water catchment pipe burying method for burying a water catchment pipe in ground with the use of a water catchment pipe burying assistance instrument including:

• a leading end cap that is formed in a cylindrical shape having a closed leading end and an opened base end, the leading end cap including a water catchment pipe coupling portion that has a circular hollow portion inside with an inner diameter, the inner diameter being substantially the same as an outer diameter of a leading end of the water catchment pipe so that the leading end of the water catchment pipe is coupled to the water catchment pipe coupling portion;
• and a separable pipe that is formed into a cylindrical shape into which the water catchment pipe is insertable, the separable pipe being attached to the base end of the leading end cap and being separated from the leading end cap after the inserted water catchment pipe is coupled to the leading end cap, the method comprising:
• a prepared hole drilling step of drilling a prepared hole in the ground;
• an assistance instrument inserting step of inserting the water catchment pipe burying assistance instrument into the prepared hole;
• a water catchment pipe coupling step of inserting the water catchment pipe into the water catchment pipe burying assistance instrument and coupling a leading end part of the water catchment pipe to the water catchment pipe coupling portion of the leading end cap;
• and
• a separable pipe pulling-out step of separating the separable pipe from the leading end cap and pulling out the separable pipe from the prepared hole.

A water catchment pipe burying method for burying a water catchment pipe in ground with the use of a water catchment pipe burying assistance instrument including:

• a leading end cap that is formed in a cylindrical shape having a closed leading end and an opened base end, the leading end cap including a water catchment pipe coupling portion that allows the water catchment pipe to be fitted thereinto for coupling;
• and a separable pipe that is formed into a cylindrical shape into which the water catchment pipe is insertable, the separable pipe being attached to the base end of the leading end cap and being separated from the leading end cap after the inserted water catchment pipe is coupled to the leading end cap, the method comprising:
• a prepared hole drilling step of drilling a prepared hole in the ground with the use of a double pipe type hole drilling machine including an outer rod and an inner rod, the outer rod including an outer bit for hole drilling at a leading end thereof, the inner rod being placed inside of the outer rod and including an inner bit for hole drilling at a leading end thereof;
• an inner rod pulling-out step of pulling out the inner rod from the outer rod;
• an assistance instrument inserting step of inserting, into the outer rod, the water catchment pipe burying assistance instrument in which the separable pipe is attached to the leading end cap;
• an outer rod pulling-out step of pulling out the outer rod from the prepared hole;
• a water catchment pipe coupling step of inserting the water catchment pipe into the water catchment pipe burying assistance instrument and coupling a leading end part thereof to the water catchment pipe coupling portion of the leading end cap;
• and
• a separable pipe pulling-out step of separating the separable pipe from the leading end cap and pulling out the separable pipe from the prepared hole.