SU1761864A1 - Method of controlling soil thickening - Google Patents

Abstract

Use in monitoring the density of soils compacted by electrically driven vibratory rollers during major earthworks. The essence during the compaction process is measured by vibrating roller on each pass of the roller the energy consumed by it from the propulsion unit of the tractor. The compaction process is considered complete when the difference the values of the measured values stabilized. 1 silt

Description

The invention relates to a measuring and control technique and can be used to control the degree of soil compaction when using vibrating rods, when performing large-scale earthworks.

A known method for controlling the density of soils, which is realized in the device for controlling the degree of compaction of the material, consists in measuring the electrical characteristics associated with the vibration parameters of vibratory rollers 1. A similar method was proposed by Dynapack - (Sweden) 2.

The disadvantages of the known methods are low accuracy in compaction of soils with a wide range of particle size distribution, as well as low productivity due to the lack of control over the compaction process.

Known closest to the proposed technical solution method,

adopted as a prototype, which consists in measuring the contact pressure in the course of work and plotting the change in soil density from passage to passage. About the end of the compaction process is judged to reduce the increments of the density of the soil 3

The disadvantages of this method are low productivity as well as low accuracy due to the measurement of contact pressure, which is unacceptable when monitoring the density of the soil with a wide range of particle size distribution.

The aim of the invention is to improve the performance and accuracy in compaction of soils with a vibratory roller.

This goal is achieved in that in an in-ground method, which includes measuring, on each pass of a compacting roller, a parameter depending on the density of the soil, and determining the end of the compacting process to stabilize the difference

. &.

The parameters measured at each previous and subsequent passes of the roller, according to the invention, measure the value of the energy consumed by the vibratory roller from the propulsion power plant as a parameter depending on the density of the soil.

The proposed method for controlling the degree of soil compaction is illustrated in the drawing, which shows a functional diagram of a device for controlling the degree of soil compaction.

The invention is as follows.

Into the electrical line connecting the power generator of the tractor, for example, the type DET-250 (not shown) with the vibratory roller electrovibrator, for example, type PVK-70EA (not shown), the insert 1 is mounted, containing resistances Ri, R2 and Rs The resistances RI and R2 form a voltage divider 2 designed to reduce the voltage coming from the tractor generator. On the resistance Ra, a voltage drop is created that is proportional to the current consumed by the electric vibrator of the PVK-70EA roller. Thus, two signals are formed, which are proportional to the voltage applied to the electric vibrator of the roller and the current consumed by it. Due to the fact that the rolling resistance of the roller decreases as the soil compresses, the instantaneous power consumed by the electric vibrator of the roller decreases. Signals proportional to voltage and current are fed to power transducer 3 to voltage. The basis of the work of preobrazovatel 3 is the implementation of the dependency:

P / uidt o

where P is the measured power;

i is the current consumed from the source;

U is the voltage

From the power transducer 3 to the voltage, a signal is supplied to the voltage-to-frequency converter 4, which converts the input voltage into a series of electrical pulses, the frequency f of which increases as the voltage rises. The resulting frequency is fed to the control unit 5, which controls the operation of the block 6 of counters and comparison elements, consisting of the first pulse counter 8 and the comparison element 9, in which the power is integrated in accordance with the dependency:

t2

W / Pdt,

ti where W is energy consumed over a period

ti ... t2.

The control unit 5 is arranged in such a way that at each successive pass of the rolling strip the pulses produced by the voltage-frequency converter 4 are recorded in block 6 of counters and comparison elements in such a way that information about the previous pass is saved in the first pulse counter 7, and the second pulse counter 8 is recorded

information about the current passage. At the end of each pass through the signal of the tractor's directional control controller, the information of the previous and the just completed one is compared.

passage. In the case when the difference in the information is a predetermined value determined by the results of the experienced rolls, the comparison element 9 generates a signal arriving at the block 10

alarm, which notifies the tractor driver that the controlled soil has reached the maximum possible density. The use of the invention allows the control of the degree of compaction of soils

to increase the productivity of soil compaction monitoring by the zinc roller, since the control and measuring works do not require additional time for processing the obtained data and are not associated with

Claims (1)

calculations, since the information on the degree of compaction of the soil is recorded directly in the rolling process. In addition, the invention makes it possible to increase the accuracy of the compaction control, since as a parameter the value of the energy consumed by the vibrating pulley from the propulsion power plant, which in this method is an integral value, is measured. Invention Formula The method of controlling the degree of compaction of soils, including measurement of a parameter depending on the density of the soil on each pass of the compacting roller and determination of the end of the compaction process stabilization of the difference of parameters measured at each previous and subsequent passes of the roller, characterized in that, in order to increase productivity and accuracy of control during compaction Soils with a vibro-roller, as a parameter depending on the density of the soil, measure the value of the energy consumed in my vibratory-roller with a power set gauge.