SU1506021A1 - Sonde for testing soil - Google Patents

Abstract

The invention relates to the study of soils in construction, in particular, to engineering-geological surveys, driven by sounding, and improves the reliability of the probe. The probe contains a housing, frontal and friction sensors made according to a bridge circuit, differential amplifiers 11 and 12, adders 13 and 14, threshold units 15 and 16, adders 17 and 18. 2 Il.

Description

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The invention relates to the field of research () c;) no soils in the construction industry. and, in particular, to exploratory geological surveys using the conductive sounding method.

The purpose of the invention is improving the reliability of the probe.

FIG. 1 shows a probe, a general view; in fig. 2 is its block diagram.

The probe consists of a cone 1, a strain gauge (a 1-pin cylindrical sensor 2 of coaxial co-resistance, a1 consists of a cylindrical ynpyi oro-element 3, active resistance strain gauges 4 glued to it, and compensanion strain gauges 5 connected in the form of a bridge 6, a strain gauge | - about a cylindrical sensor 7 of a frontal friction, apparently, one of the same way and containing akivn1) 1e M resistance gages, a K-12 censor strain gage, 1 and 9, differential amplifiers 11 and 12, adders 3 and 14, 15 blocks of 15 and 16, summatoro 17 and 18, the friction clutch 19, which rasio- .yuzheny:, 1ekt1K) nnye blocks.

The cone-1, the sensor 2 of the frontal side of the body, the mufga of the harp 19, the sensor, the tobs () 1 of the friction 7, are rigidly connected between co6oii threaded connections. The resistances of the active shoulders of the Nak, Iyeny but form: Tsei on nogivivopozhnye side u1, n1nd | K) in the sensors, n, K), the symmetry bridges and glues are between themselves an angle of 90. (l m-mators 13 and 14 and adders 17 and 18 have an output signal, 11) the normal sum of two input signals, Comrade. The bodice (}) of e-peHiuia, ibHbie amplifiers 11 and 12 have an output signal that ironically differentiates the input signal.

The output signal is 1b, 1b from the normative blocks 15 and 16 is absent at threshold thresholds, and 6o at input settings: ibHie iioporoBiiLx has the maximum value. On the bridge cxeMi i ti and 10 by

Threading is given, and from the output adders 17 and 18 a signal is fed to the recording unit blocks.

The probe slab1.) Melts with, teduk) or 1 processing) th.

The probe is crushed into the ground, while ITOM squeezes the legholes of the general sonr () tiv, shadows 2 and, tobovo (1) friction 7, respectively, squeezes the resistor | 1 akginyh n.tech. li and the researchers of the diagonal x of the Mocio schemes 11 (ЯВ, ТИ1ОТСЯ |) az || oc fiibie signal, U) i,

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which are amplified by the respective differential amplifiers 11 and 12 and through the output adders 17 and 18 are fed to the input of the device.

In the absence of probe bending, changes in the resistance of the strain gauges of the active arms of the bridge circuit, and on the opposite sides of the cylindrical sensors, are the same, respectively, the same but opposite in sign to the removable signals, falling into the adders 13 and 14, they are mutually compensated. At the output of the adders there is no signal.

When the probe is bent, the changes in the resistances of the strain gauges are different in magnitude and are not compensated - signals that are proportional to the bend appear at the output of adders 13 and 14. If the signals exceed the threshold voltages, the threshold blocks 15 and 16 are triggered, the voltages at the output of the adders 17 and 18 abruptly increase and can be fixed by the recording device. According to which of the channels, the incidence increases and by its polarity it is possible to determine the direction of the bend of the probe.

By means of the proposed probe, the reliability of the probe operation is achieved.

Claims (1)

Invention Formula A probe for soil testing, containing strain gauges of frontal soybean sensors and friction, made in the form of bridge circuits with differential amplifiers, the first and second adders, the threshold unit and recording units, the outputs of the differential amplifiers are connected respectively to the same inputs of the first and second adders , the output of the threshold unit is connected to another input of the first adder, and the outputs of the first and second adders are connected to the corresponding recording units, characterized in that o, in order to assure reliability in operation, it is equipped with an additional threshold unit and third and fourth adders, with the inputs of the threshold units connected to the outputs of the third and fourth adders, whose inputs are connected to the measuring diagonal of bridge circuits, and the output of the additional threshold unit connected to another input of the second sum.mator. eight  Plank ho / fleaff (/ a / 77 lle datel of the Llos / osm symmett- puufiOMed f (ua / (/ 77tJ6- bu bo / 77iiki J} 060SOZ3 salt / shower 1