SU1155674A1 - Apparatus for determining mechanical properties of soil - Google Patents

Abstract

A DEVICE FOR DETERMINING THE MECHANICAL PROPERTIES OF THE SOIL, including a hollow rod, a toroidal elastic sheath placed on a full shtanga, load and measuring devices and a pressure accumulator, characterized in that, in order to increase labor productivity, the device is equipped with a holder and strain gauges with strain gauges This holder is made of equal sections with stamps placed on them with different sizes of the supporting surface and lugs on the outer surface, with one end connected to the holder, and the other - with a load device, the toroidal elastic shell is placed with the possibility of longitudinal movement between the rod and yoke and through spout is sealingly connected to the hollow rod.

Description

ate

05

The invention relates to the construction, in particular, to devices for determining the non-critical properties of a soil in engineering geological surveys.

A device for determining the mechanical properties of the soil is known, comprising a hollow cylindrical body with a centrally located hollow rod and an elastic shell equipped on the outside with split grousers, a load and measuring device, a pressure accumulator with a clamp, a flexible pull between the cylindrical body and the load adaptation 1.

However, such a device is characterized by insufficient measurement accuracy and low productivity.

Closest to the present invention is a device for determining the mechanical properties of the soil, including a hollow rod, a toroidal elastic shell placed on a hollow rod, a load and measuring device, and a pressure accumulator 2.

The disadvantage of the device is the low productivity of determining the mechanical properties of the soil, due to the need to repeatedly test the soil at different stages of its loading.

The purpose of the invention is to increase labor productivity in determining the mechanical properties of the soil.

The goal is achieved in that the device for determining the mechanical properties of the soil, including a hollow rod, a toroidal elastic shell placed on a hollow rod, loading and measuring devices and a pressure accumulator, is provided with a yoke and pull-rod with strain gauges, while the yoke is made of equal sections stamps placed on them with different sizes of the supporting surface and lugs on the outer surface, with one end connected to the holder and the other to the loading device, toroidal elastic The shell is placed with the possibility of longitudinal movement between the rod and the holder and is tightly connected to the hollow rod by means of a fitting.

FIG. 1 schematically shows the proposed device; in fig. 2 shows section A-A in FIG. one.

The device contains a hollow rod 1 with a stamp 2, a toroidal elastic sheath 3, hermetically connected to the hollow rod 1 by means of a choke 4, a holder of different-sized sections 5 with dies 6 placed on them with differently supporting surfaces and grousers 7, 8 with strain gauges 9, load device, including a power cylinder 10, an oil pump, 11 with a pressure gauge 12 and pressure pipes 13, a measuring (recording) device 14, a pressure accumulator 15 with a pressure gauge 16, connected via pipe 17 s shtutser 18 with hollow shtanga.

The device operates as follows: In the finished hole, the bottomhole is lowered.

5 a stamp 2 with a hollow rod 1 connected through a fitting 4 with a foamed elastic sheath 3.

Assembled from separate sections 5, equipped with different-sized dies 6 and lugs 7, the holder on the th 8 8 is lowered onto the chip 2 between the borehole wall and the elastic shell 3.

The rods 8 with the strain gauges 9 are connected to the brackets of the power cylinder 10 mounted on the upper end surface of the hollow rod 1.

The pressure accumulator 15 is connected to the rod 1 through the nozzle 18 and compressed air is supplied into its cavity, and through the clamper 4 it inflates the elastic sheath 3, transferring pressure through the dies 6 to the ground.

0 In this case, the lugs are inserted into the walls of the well, and under each stamp in the soil there are different stresses (the degree of compaction) proportional to the area of each shaft.

Then, using the oil station 11, pressure is applied to the power hydraulic cylinder 10. At the same time, the 1LTOK of the hydraulic cylinder, pushing forward, transmits through the rod 1 pressure to the die 2, and through the pulls 8 with strain gauges 9 - the tensile force to the shtampy 6 with ground chains 7, providing cut with varying degrees of soil compaction.

Based on the readings of the strain gauges 9, the magnitude of the shearing force is determined by means of the registering device 14 and the specific resistance of the soil shear is calculated for several (the number of sections with dies) compaction conditions of the soil under study.

The device not less than three times increases labor productivity due to the elimination of repeated operations to create increasing pressure levels on the lateral surface of the soil (the degree of its compaction) and shearing forces.

Claims (1)

DEVICE FOR DETERMINING MECHANICAL PROPERTIES OF SOIL, including a hollow rod, a toroidal elastic shell placed on a hollow rod, load and measuring devices and a pressure accumulator, characterized in that, in order to increase labor productivity, the device is equipped with a cage and rods with load cells, while the cage is made of equal sections with stamps placed on them with a different support surface and lugs on the outer surface, the rods at one end connected to the cage, and the other to load device, a toroidal elastic shell is placed with the possibility of longitudinal movement between the rod and the holder and through the fitting is hermetically connected to the hollow rod. SP SL 05 4 ^>