SU1388799A1 - Method of checking ground compaction - Google Patents

Abstract

The invention relates to the construction, in particular to the compaction of soils with dynamic loads. The aim of the invention is to increase the accuracy and reliability of monitoring the soil chargeability. For this purpose, a working seismic receiver 4 is fixed on working body 1 with a percussion mechanism 2 embedded in a compacted soil layer 3, and a seismic receiver 5 is compacted in a compacted soil layer. In accordance with the calibration dependence i M ( 2 cKi) (where d is the difference between the vibrations of the soil and the working body; skle of the skeleton of the soil) set the value of the specified difference lzd corresponding to the required, When the specified value i is reached, the executive mechanism G2 turns off the shock mechanism system 2. 1 ill. 1 s

Description

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The invention relates to the construction- The second stage - control sealing

for compaction of backfilling soils with dynamic loads.

The aim of the invention is to increase the accuracy and reliability of controlling the density of the soil.

The drawing shows a control scheme for soil compaction.

In the drawing, the following symbols are accepted: 1 — working body; 2 - blow .. E

3,

memory setpoint 8 and further in block 7 comparison. Then a percussion mechanism ..., j,, 2 through the working body 1 is applied

, j, are the layers of the soil (n is the number of holes along the compacted layer III of the soil, layers); 4 - a seismic receiver, installed - 15 with a seismic receiver 4 registered on the working body; 5 - seismic current amplitude values A r a receiver mounted in the ground ;. and the oscillation frequency of the working body 6 - vibration amplifier; 7 is block 1. These oscillations are through the comparison amplifier 6; 8 - master memory block; arrive at block 7 comparison, where 9. is the power source; 10 - signal 20 is determined by the difference A n; G; - the device, 11 - the registering device - i - / zs (l

roystvo; 12 — actuator — Values of s /, are transmitted to the signaling unit; 13 - hydro or pneumatic system 10 (for example, a light-shock mechanism. Dotted line, sound, etc.), recording the measurement scheme shown with an experienced 25 device II (for example, self-recorder, compressed oscilloscope) and upon reaching the value The next stage is 4 / 4–4 ± t (where 5 is the total time, the error of the measuring circuit) and the first stage is an experimental compaction. An additional mechanism 11 (for example, for this task, a working organ 1 with a strike-30 electric, hydraulic or parasol hammer) mechanism 2 is set to shut off the hydraulic or pneumatic system by sealing the soil layer 3. On the operating mechanism of the impact mechanism 2, which is caused by the organ 1 is fixed by a seismic receiver to the cessation of striking a nickname A (for example, SV-Yu), and in the sealing body 1 by layer 3 layer 3, lay down the seismic - This moment means the end of the seal receiver 5 (for example, also CB-10). Then the shock mechanism 2 through the working body 1 strikes the compacted soil layer 3, at the same time, the seismic receiver 4 records the current Q amplitude values of AGR, and the oscillation frequency f p of the working body 1, and the seismic receiver 5 amplitude and vibration oscillating frequency f ted

not a layer of 3j, soil to a given density.

The measurement scheme for controlling the soil compaction during the production process is shown in the drawing by a flat line.

The compaction of the subsequent layers Z, ..., 3j, 3, at this site is carried out similarly to the second

layer 3 soil. These oscillations are through a dstapu. the amplifier 6 enters block 7 compared — If during the production of a wound, where their values are compared by the bot, the readings d, are stabilized, and the difference of these quantities is determined, then this means that this layer 3 is bani; (A | .fj - Ap.fp;). Then ground with this impact mechanism 2

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the values of D are transmitted to the memory block of the setter AND (for example, an oscillator).

Simultaneously with the compaction of the layer 3, the current values of the density are determined.

with a working body 1. compacted to the value of its maximum density. In order to achieve a higher density of the soil, various measures can be applied, for example, a more powerful percussion mechanism, a decrease in the thickness of the compacted layer, a more rational construction of the tool, and so on.

to

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this layer is known method (for example, the method of cutting rings) and experimentally establish the dependence of d; / (1u cuv). ,

soil in the course of work, For this purpose, the working body I with a fixed geophone 4 fixed on it is installed on a scanned layer 3 of soil. Set the value corresponding to the value of -v, ko0 with k. Ftp

This is required to be ensured during compaction, and this value is entered into the block.

not a layer of 3j, soil to a given density.

The measurement scheme for controlling the soil compaction during the production process is shown in the drawing by a flat line.

The compaction of the subsequent layers Z, ..., 3j, 3, at this site is carried out similarly to the second

stage. If in the course of the work production the readings d, are stabilized, this means that the given soil layer 3 by this percussion mechanism 2

with a working body 1. compacted to the value of its maximum density. In order to achieve a higher density of the soil, various measures can be applied, for example, a more powerful percussion mechanism, a decrease in the thickness of the compacted layer, a more rational construction of the tool, and so on.

The application of the proposed method allows to maintain quality 3. 1388799

control of the density of ground oscillations of the working body, o t, when the device has reverse loops, which reduces the ten, that

the cost of these works is also to increase the accuracy and reliability.

50% increased accuracy and reliability. checking the density of the soil; additional measurements of the density of the soil;

its compaction, soil, determine the difference of oscillations of the working body and compaction of the formula of the soil and determine the degree of

) Compaction of the soil, thus achieving the method of controlling the soil compaction, the maximum soil density, including the impact, is determined by the stabilization of this difference of soil and the measurement of amplitude-frequency oscillations.

Claims (1)

Claim A method of monitoring soil compaction, including impact on the soil and measuring the amplitude-frequency vibrations of the working body, characterized in that, in order to improve the accuracy and reliability of monitoring the density of the soil, they additionally measure the vibrations of the compacted soil, determine the difference in the vibrations of the working body and compacted soil and it is used to judge the degree of compaction of the soil, while achieving the maximum soil density is determined by stabilizing this difference in vibrations. Compiled by V.Vrachev Editor T. Parfenova Tehred M. Khodanich Corrector I. Muska Order 1575/46 Circulation 847 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries <113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and printing company, Uzhhorod, st. Project, 4