| 摘要 |
PROBLEM TO BE SOLVED: To provide a standard penetration testing device superior in convenience in use, and capable of highly accurately performing a standard penetration test. SOLUTION: A scale 13 is installed in a vicinal position of a knocking block 4. A drive hammer 6 is set, and a guiding boring rod 5 is connected. The drive hammer 6 is lifted by the prescribed height by a hammer holder 7, and is freely dropped along the guiding boring rod 5. The scale 13 is imaged by an imaging means 8, and a preliminary driving test and/or a regular driving test are performed on the basis of image information imaged by the imaging means 8 and the impact number of the drive hammer 6. COPYRIGHT: (C)2005,JPO&NCIPI
|
