Portable soil body in-situ density tester

Abstract

The invention discloses a portable soil body in-situ density tester which comprises five parts, namely power equipment, soil sampling equipment, a bulldozing structure, a weighing instrument and a base; the power equipment is divided into a lifting device and a pressing device; the pressing device adopts a jack mechanism capable of being inverted; the lifting device is of a small gear structure, and the structure comprises five parts of a transmission gear, a transmission rack, a hand-cranking handle, a transmission rack support and a supporting frame. The portable soil body in-situ density tester has the advantages that the in-situ density of the soil body is measured, the test principle is clear, the structure is simple, the test steps are few, the speed for penetrating into a soil layerfor soil sampling and the lifting speed after sampling can be freely controlled, the soil sampling efficiency is high, and the detection time is shortened; the adopted instrument is small in size, does not need an external power supply and is convenient to carry, the average natural density of the taken soil sample is directly measured, and the taken soil sample is pushed out after the test is finished, so that secondary disturbance of the test is avoided, and the accuracy of a density test result is improved.

Description

technical field [0001] The invention relates to the field of soil density testing, in particular to a portable soil in-situ density testing instrument. Background technique [0002] The density of soil refers to the mass of soil per unit volume. As one of the basic physical and mechanical properties of rock and soil, it reflects the compactness of the soil. It is a technical index, and at the same time, it provides necessary calculation parameters for the determination of soil related parameters and related design for the division of soil categories. Therefore, accurate measurement of density is of great significance for related physical and mechanical parameters. [0003] There are many existing density testing methods, such as traditional density testing methods such as sand filling method, water filling method, and ring knife method, as well as electric earth taker method, additional mass method, volume replacement method, rapid penetration method and nuclear density hygr...

AI Technical Summary

Problems solved by technology

Among them, the sand filling method is time-consuming, laborious, and low in test efficiency. The selection of standard sand has large errors and many influencing factors. It is often a disputed link between the quality inspection department and the construction unit; the sand filling method is mainly suitable for on-site For the density measurement of coarse-grained soil, although the method is simple in equipment and easy to operate, it also has defects such as time-consuming, labor-intensive, cumbersome detection process, many artificial and objective environmental factors, and low test efficiency and accuracy. Simple, easy to carry, easy to operate, and a small number of samples, but its disadvantages are large damage to the structural layer, low detection efficiency, damage to the soil structure, large influence of human factors, poor representativeness of the results, small scope of application, and limited by the soil. The type and other factors have a great influence. After the ring knife enters the soil, it will produce a certain stress that will affect the surrounding soil to a certain extent, and sometimes even affect the overall construction progress of the project; the nuclear density meter method and the non-nuclear density meter method Although the method belongs to a rapid non-destructive indirect soil density detection method, the former requires a complicated calibration process before the instrument leaves the factory and before the test work is carried out, and the nuclear density meter method has a certain radiation risk. The requirements of the latter and the testing site are relatively large. Although the non-nuclear density meter method of the latter has changed the defect of the nuclear density meter method that has radiation hazards, it also performs more complicated instrument calibration work. Short, there is a lack of corresponding legal regulations to standardize its testing process; the use of the additional mass method, as far as it is concerned, is mainly used in the in-situ density detection of rockfill bodies, and further verification is needed for the density detection of other soils; volume replacement Due to the short time for the proposed method and the rapid penetration method, there is a lack of a large number of actual projects to verify the accuracy of their detection results.

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