Measuring head intended to be fitted to a dynamic penetrometer and method of measurement using such a measuring head

摘要

A measuring head, intended to be fitted to a dynamic penetrometer, and attached to a drill string provided with a tip, includes a driving head intended to receive an impact to be transmitted, via the rest of the measuring head, to the drill string; and a central rod for transmitting the impact from the driving head to the drill string, the central rod having a first end turned towards the driving head, and a second end opposite the first end, and suitable for engaging with the drill string, the central rod being provided with at least one deformation sensor. It includes at least one absorption member interposed between an impact receiving end portion of the driving head and the second end of the central rod and which is suitable for filtering the wave transmitted to the drill string when the end portion of the driving head receives an impact.

主权项

1. A measuring head, intended to be provided on a dynamic penetrometer and suitable to be connected to a string of rods provided with an end tip, this measuring head comprising:
a driving head intended to receive an impact to be transmitted, via the rest of the measuring head, to the string of rods, the end tip being suitable for being driven into the ground when an impact is applied on the driving head, a central rod for transmitting the impact from the driving head to the string, said central rod has a first end, which is turned towards the driving head, and a second end, which is opposite to the first end and which is suitable for engaging with the string, and said central rod is provided with at least one deformation sensor, for collecting signals that are representative of the variations of the resistive force at the end tip and of the acceleration during the driving of the end tip in the ground under the effect of the impact on the driving head, and at least one absorption member, which is interposed between an end impact receiving portion of the driving head and the second end of the central rod and which is suitable for filtering a wave transmitted to the string when the end impact receiving portion of the driving head receives the impact.