INSPECTING DEVICE FOR HARDNESS OF SOIL AT TIME WHEN FOUNDATION PILE IS PRESSED IN AFTER EXCAVATION

摘要

PURPOSE:To enable easy judgement of a constructing state of a bulb pile, by a method wherein a consumed power of a motor for an excavator is determined based upon a pile inserting speed found by a sensor and is converted into an N-value to record it in a pen recorder, and a feed quantity of a chart paper and the pile inserting speed are synchronized with each other. CONSTITUTION:A sensor 20 is attached to an elevating excavator C, and the sensor 20 is moved in a manner to make contact with a guide stay B. Through the working of inserting speed sensor 1 at the inside of the sensor 20, a hardness torque at a forwardmost end of a screw auger E of the excavator C is detected as a consumption power of a motor D built into the excavator C, a measuring pulse, simultaneously, is generated, an inserting speed of a pile is tuned and measured, the consumption power of the motor D is recorded as an N-value in a pen recorder, a feed speed of a chart paper is synchronized with the inserting speed of the excavator, and the chart paper is moved in a normal and reverse feed direction. This enables saving of the chart paper and permits the easy judgement of a shape of a bulb pile.