INSTALLATION METHOD OF WATER PUMPING WELL, AND STEEL PIPE CASING

摘要

PROBLEM TO BE SOLVED: To provide an installation method of a water pumping well, allowing for a deep construction depth.SOLUTION: A steel pipe casing 1 includes a steel pipe 2 and a lid body 10 to be detachably fixed to the tip of the steel pipe 2. The installation method of a water pumping well includes embedding a perforated pipe 20 which can be inserted in the steel pipe casing 1. The diameter of the tip part of the steel pipe 2 is set larger than the diameter of other parts. The steel casing 1 is screwed into a layer 80 to be treated in a state that the steel pipe 2 is fixed to the lid body 10. When the lid body 10 reaches a predetermined depth, the lid body 10 is removed from the steel pipe 2, and crushed stones S are then fed into the steel pipe 2. The steel pipe 2 is lifted up in the axis direction, leaving the lid body 10 and the crushed stones S so as to build a crushed stone column C. A collected crushed stone column Cis composed of a plurality of crushed stone columns C. Subsequently, the perforated pipe 20 is embedded in the collected crushed stone column C, using the steel pipe casing 1.