SU850797A1 - Bed for investigating strength and deformation properties of soil - Google Patents

Description

STREET FOR THE STUDY OF FLUORY CHARACTERISTICS OF SOIL AND DEFORMATION

The invention relates to the construction, in particular, to the technique of studying the mechanical properties of i yHTOB for foundations and foundations of hydraulic structures of floating drilling rigs.

Closest to the present, there is a stand containing a tray, over which a support frame with a hydraulic jack is mounted, the rod of which is supported on the stamp, and the movement indicator 1.

However, the device does not allow to create, at the same time as a vertical static load, a periodic dynamic load, for example, a torque, which simulates the operation of drilling rigs.

The purpose of the invention is to provide a determination of the mechanical properties of n) uts under foundations, which are simultaneously tested with vertical static ones; loads dynamic loads of a different sign.

This goal is achieved by the fact that the stead for studying the strength characteristics of the soil, which contains a tray, over which a supporting frame with a hydraulic jack is installed, whose jaws are supported on the punch, the displacement indicator, is mounted on the frame. a double acting hydraulic cylinder and a adjustable spring of adjustable stiffness mounted on the stamp with a counterweight placed at one end of the die, the other end of which interacts with the rod of the double acting hydraulic cylinder through a hinge.

The installation of a flat spring between the 10 ps and the hydrocyliidra piston allows for a clear linear relationship between the movement of the hydraulic cylinder rod and the torque applied to the stamp, taking into account that the punch movements are two orders of magnitude smaller

15 cylinder movements. The absence of a spring makes it necessary to adjust the pressure in the cavity of the hydraulic cylinder according to the required law, and this presents a considerable technical difficulty, since

Claims (2)

20, the pressure itself is determined by the response from the die, depending on the resistance of the soil, the value of which is examined with the help of the proposed stand. In order to obtain a predetermined mode of change in the magnitude of the moment in time, as well as to maintain the optimum piston stroke when the maximum force in the hydraulic rod is changed, the spring is equipped with a device that regulates its rigidity. In order to balance the movable parts of the hydraulic cylinder, the cantilever and the spring, in order to ensure a symmetrical application of torque from the opposite side of the punch, a directional slide with a movable counterweight is installed. This design allows you to create a predetermined variable moment on the stamp with periodic movement of the piston of the hydraulic cylinder. 4epTeHte shows the proposed stand, general view. The stand has a soil tray 1, on which the power frame is installed 2. A hydraulic jack 3 of vertical force is attached to the power frame JKeCTKO, on the rod of which a stamp is fixed to 5 using a ball joint 4. On the stamp there is a console 6 on one side and guides on the other side 7. A flat spring 8 is attached to the console 9, and a movable counterweight 10 is mounted on the guides. A hydraulic cylinder 11 is hinged on some of the hydraulic cylinder 3 mounting, the rod of which is connected to the flat spring end by means of the hinge 12 and the hydraulic cylinder | f is a double action cylinder with the same piston area during the course in both directions. Sensors 13 lycrunsfi are installed on the rods of the hydraulic jack 3 and hydraulic index 11. Along the edges of the stamp 5, displacement sensors 14 are installed. The device works as follows. During the tests, the stamp 5 is pressed into the ground by a hydraulic jack 3, and with the help of the movement of the rod the hydrocable) And through the rutachu 8, a periodic moment is created on the stamp on both sides. Measurements of the forces on the lUTokax of the hydraulic jack 3 and the hydraulic cylinder 11 are carried out by the force sensors 13, and the displacement values of the die 5 and downward and rotation relative to the hinge 4 are carried by the displacement sensors 14. The installation of an additional hydrodynamic movement in reciprocating motion according to a given law, the stem of which is connected with a stamp through a spring, allows the facilities to expand and to ensure that the structural foundations of structures are supported by the combined effect of vertical static loads. Claims for testing the strength and deformation characteristics of a soil, comprising a tray, over which a supporting frame with a hydraulic jack is installed, the stock of which is wired on a punch, displacement indicator, characterized in that, in order to determine the mechanical properties of Pbd soils for 5 grams which, simultaneously with static loads, have dynamic loads of a different sign, it is equipped with a mock-up on the frame with a general double-action and a flat spring mounted on the stamp stiffness with npotHBOBecoM, located at one end of it, the schiutoto end of which through the hinge interacts with the rod of the hydraulic cylinder of double action. Sources of information taken into account during the examination I. Yu. Murzenko, N. Experimental studies of the stress-strain state of a sandy foundation under a rigid foundation. Novocherkask, 1964 (prototype).