A kind of portable dynamic penetration tester and test method

Abstract

The invention discloses a portable power penetrating tester, which comprises a probe head, a probe rod, a measuring rod, a hammer base, a weight and a scale rod. The upper end of the hammer is fixedly connected, the hammer seat is fixed on the upper end of the measuring rod, and the top of the hammer seat is provided with a guide rod, which slides and fits with the weight; the probe rod and the measuring rod are both hollow rods, and the scale rod is located inside the probe rod. And the lower end of the scale rod is connected with the detection head, the upper end extends into the measuring rod, and the side wall of the measuring rod is provided with an observation window. Also disclosed is a testing method, comprising: aiming the probe head at the position to be tested, and keeping the tester vertical; lifting the weight to a set height, then letting go, and the weight hammers the probe head into the soil; repeating In the above steps, when the probe head moves down by 10cm, record the total number of hammer strikes; when the penetration depth of the probe head reaches the required level, pull out the tester. The tester is small in size, light in weight and easy to carry.

Description

technical field [0001] The invention relates to the field of detection equipment, in particular to a portable dynamic penetration tester and a test method. Background technique [0002] At present, in the geotechnical investigation of power engineering, housing construction, road engineering, municipal engineering and water conservancy engineering, dynamic penetration testing is generally carried out. Power penetrating probes are divided into four types: miniature, light, heavy and super heavy. Dynamic penetration test is a very important field test method in geotechnical engineering investigation. The dynamic penetrometer uses the kinetic energy generated by the free fall of its falling hammer to transmit to the cone head through the penetrating rod, so that the cone head can overcome the resistance of the formation and penetrate into the formation. Changes in the number of impacts required for a fixed distance are used to identify changes in the properties of the formati...

AI Technical Summary

Problems solved by technology

The key to dynamic penetration testing is to obtain data that can reflect the change of probe resistance. At present, only the number of hammers can be used to indirectly judge the resistance of the probe, and the interference of probe rod resistance cannot be eliminated (if the resistance of the probe rod is large, the obtained hammer The number of hits will be seriously high, and the soft soil layer where the probe is located may be misjudged as a hard soil layer)

Images