THE PROTECTIVE EQUIPMENT OF UNDERGROUND MEASURING INSTRUMENT

摘要

PURPOSE: A protective device for an underground measuring instrument is provided to accurately measure the conduct of ground and to prevent damage to the measuring instrument by soil and rock fragments when approaching the ground. CONSTITUTION: A protective device for an underground measuring instrument comprises a floor protective member(12), a cover plate(30), and a ball plunger(40). The floor protective member is attached to a temporary construction(10) and covers around the floor side of the underground instrumentation. The cover plate comprises a cable for stripping on the upper part and is inserted to the floor protective member.