SU631586A1 - Probe-deformeter - Google Patents

Description

I

The invention relates to engineering and geological surveys and, in particular, to devices for determining mechanical properties, preferably weak soils.

Known pressiometer, including

body with elastic shells and a number of overlapping plates; measuring device G.

The closest technical solution to the invention is a pressiomet comprising a chamber with an elastic sheath surrounded by flexible longitudinal elements connected to the lower and upper flanges, between which the Gh bellows is mounted.

The disadvantage of these devices is the inaccuracy of measurements of radial deformations and the impossibility of pressing them into the ground.

The aim of the invention is to improve the accuracy of measurements of radial deformations by transferring uniform pressure to the ground and ensuring the possibility of pressing the probe pressure meter into the ground.

This is achieved by the fact that a probe-pressure meter, which includes a working chamber with an elastic shell, surrounded by flexible longitudinal elements connected to the lower and upper flanges, between which the bellows is installed, is provided with a conical tip, the flexible longitudinal elements are made with rigid plates, and the working chamber equipped with two coaxially mounted and placed in the bellows tubes, one of which is equipped with a tapered tip, and the pipes are provided with a split screw connection.

Claims (2)

The invention is illustrated in the drawing. The probe pressiometer consists of a working chamber including an elastic sheath 1 fixed between the upper and lower flanges 2 and 3. The flanges 2 and 3 are connected from the outside by flexible longitudinal elements 4 with attached rigid plates 5. The flanges 2 and 3 are mounted on the correspondence of the bottom and the top of the central pipes 6, connected between the sesa by a detachable retaining connection. The bottom flange 2 is fixed on the pipe 6 rigidly, and the top - with the possibility of rotation. Between flanges 2 and 3 inside the working chamber is installed bellows 7. The cavity of the chamber is connected to a source of compressed air by a pipe 8 having a head 9, with a pressure gauge 10. The upper tube 6 is placed in the rod 11 and is connected to the last threaded coupling 12 with clamps 13. Above The tube 6 is fixed to the deflection gauge 14 of its flywheel by means of inextensible {strand 15 and weight 16 connected to a conical tip 17 mounted on the lower tube 6. The soil test is carried out in the following order with the aid of a zonapressiometer. By rotating the threaded sleeve 12 fixed on the upper pipe 6, they preload the elastic sheath 1 and the longitudinal elements 4. This allows the probe-pressure meter to be immersed in the ground or in a pre-drilled well by indentation, for example, with a sounding device of a known design. (not shown in the drawing. After the probe is immersed in the ground, by rotating the coupling 12 in the opposite direction, the longitudinal elements 4 and the shell 1 are released from tension; at the same time, the vertical pipe 6 is released from hooking from the bottom to the eye During the test, pressure is transmitted to the thread by steps in accordance with GOST 2027674. Compressed air, whose pressure is controlled by a pressure gauge 10, is supplied to the working chamber and causes the elastic shell 1 to expand, which informs the reinforced portion of the longitudinal elongates radial movement, which causes a change in the distance of the upper and lower flanges. The magnitude of the mutual displacement of flanges 2 and 3 is fixed by the deflection by measure 14 using a non-expandable filament 15. 6 Thus, the transfer of pressure by the elastic shell only to the reinforced portion of the longitudinal elements ensures the translational movement of the latter and the uniform transfer of pressure to the ground. In this case, the conditions of the plane-deformed stress state are provided, which facilitates the processing of the results. Improving the accuracy of measuring radial displacements is achieved by reducing the length of the bend section of the longitudinal elements. The presence of connected pipes inside the chamber, as well as a conical tip, allows the probe-receiver to be indented into the soil to a predetermined depth. In this case, the initial distortion of the stress state of the soil resulting from the introduction of the probe can be taken into account on the basis of the solutions of known problems. Claim 1. Probe-sensor, including a working chamber with an elastic sheath surrounded by flexible longitudinal elements connected to the lower and upper flanges between which there is a bellows, is due to the fact that, in order to increase the measurements of radial deformations by transmitting uniform the pressure on the ground and the possibility of pressing the probe-adapter into the ground, it is provided with a conical tip, flexible longitudinal elements are made with rigid plates, and the working chamber is equipped with two coaxial caps tubes that are tanned and marked in the bellows, on one of which a conical tip 2 is installed. A probe-pressometer according to claim 1, characterized in that the pipes are provided with a detachable threaded connection. Information sources taken into account during the examination: 1. Author's certificate N 429311 02d 1/00, 1974. 2. The copyright certificate number 394683 02 d 1 / OO, 1974.