EXCAVATING TOOL FOR INVESTIGATING SURFACE LAYER POLLUTION AND GEOLOGICAL POLLUTION INVESTIGATING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a highly efficient excavating tool for investigating geological surface layer pollution and an investigating method capable of easily making an accurate investigating in a short time in the optional depth without hole wall collapse. SOLUTION: An excavating bit for investigating surface layer pollution is composed of a cutting edge compose of a hard material arranged on the tip, a coupling arranged on the rear end, and connected to a spindle of a drill head or a drill rod of an excavator so as to be freely engageable-disengageable, and a body part arranged between the cutting edge and the coupling, and having an underground air vent for communicating with the outside in a lower part and a freely openable-closable valve for preventing intrusion of sediment into the underground air vent. The body part is constituted so that a tip part of an underground air gathering pipe inserted inside from a rear end opening part can be airtightly maintained and communicated with the underground air vent.