| 摘要 |
PROBLEM TO BE SOLVED: To provide a sampling apparatus which reduces the contact frictional resistance of an intertruss bracing ring with respect to a peripheral surface of a sampling cylinder. SOLUTION: There is provided a sampling apparatus for use in a geological boring survey, which is constructed by connecting an external cylinder 12 to a test drill via a connecting tube so as to be rotatively driven, fitting a sampling cylinder 6 into the external cylinder 12, supporting an upper end of the sampling cylinder 6 by means of the external cylinder 12, and attaching an intertruss bracing ring 31 which supports a lower end of the sampling cylinder 6, onto an inside at a lower end of the external cylinder 12. In the thus constructed sampling apparatus, the intertruss bracing ring 31 has supporting projections 31a which each make sliding contact with a peripheral surface of the sampling cylinder 6, on its internal peripheral surface at required intervals in the circumferential direction. Further, pressure water flowing gaps 31b are defined by the projections 31a and the peripheral surface of the sampling cylinder 6.
|
