| 摘要 |
PROBLEM TO BE SOLVED: To provide a completely automatic penetration test device capable of completely automating operation of pulling up and free dropping of a hammer, count of the number of hits, measurement of the amount of penetration of a sampler for a standard penetration test and calculation of N value. SOLUTION: A completely automatic penetration test device is constituted of a boring rod 3 mounting a sampler thereto, a hammer 4 suspended with a string-like body 5 for driving the sampler in the ground, a hammer rising device 8 rewinding the string-like body 5 on a winding drum to raise the hammer 4 to a specific height, a hammer rising length detection device for detecting the rising length of the hammer 4 and a hammer dropping device for driving the boring rod 3 in the ground by freely dropping the hammer when a specific rising length is detected by the hammer rising length detection device. It is also equipped with a penetration quantity detection device for detecting the amount of penetration of the sampler by the driving, a repeating control device 12 for repeating the rising and free dropping of the hammer until the detected amount of penetration reaches a specific amount, a recording device for recording the number of repetitions, an indication device for indicating the measurement data, an output device for preserving the measurement data and an input device for a key board, an emergency stop switch, etc.
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