SU1254113A1 - Pickup for measuring reactive pressure of soil - Google Patents

Description

The invention relates to the mechanics of grouses and can be used to measure the reactive pressure of the soil of the base to the zone of its contact with its foundations, foundations, and experienced punches.

The aim of the invention is to improve the reliability of the sensor.

The drawing shows a sensor for measuring the reactive pressure of the soil, a longitudinal section.

The sensor for measuring the reactive pressure of the soil consists of a body 1, made in the form of a cup 2 with a bottom 3. Inside the body 1, in one of its ends, a membrane 4 is mounted for movement along the glass 2. The membrane 4 is made with an annular abutment 5. To the bottom 3 A cup 2 is rigidly attached to a ring magnet b, and a second ring magnet 7 is attached to the ring stop 5. The ring magnets 6 and 7 are interconnected by a spring 8. The ring magnets 6 and 7 can be made, for example, of magnetic rubber.

The sensor for measuring the reactive pressure of the soil is embedded in the body of the foundation 9 so that the perceptive pressure of the soil membrane 4 is in the same plane with the lower face of the foundation 9. The end of the sensor facing the ground is covered with an elastic waterproofing film 10. A pipe 11 is mounted on the surface so that its lower end goes inside the ring stop 5. The pipe 11 is installed with ring magnets 6 and 7. The sensor body 1, membrane 4, spring 8 and coarse 11 are made of non-magnetic materials. ialov.

The sensor for measuring the reactive pressure of the soil works as follows.

Before plugging the sensor into foundation 9, it is calibrated by control

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five

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in loads. In this case, the relative position of the ring magnets b and 7 is fixed, each of which corresponds to a certain pressure per unit area of the membrane 4 of the sensor.

When a load is applied to the foundation 9 installed in the soil, a reactive pressure arises that acts on the lower edge of the foundation 9 and, accordingly, on the membrane 4. Under the influence of the reactive pressure of the soil, the membrane 4 with a ring magnet 7 attached to its ring stop 5 inside the housing 1. At the same time, the ring magnet b rigidly attached to the bottom 3 of the cup 2 remains stationary. When the reactive pressure of the soil on the membrane 4 decreases, it returns to its original position under the action of the spring 8.

The change in position of the ring magnet 7 relative to the stationary ring magnet b is measured as follows. A sealed contact ((ercon) is supplied through the pipe 11 passing through the body of the foundation and inside the sensor case into the body 1. It is equipped with a measuring leptas and a logging device (not shown). With the passage of the reed switch mounted on the measuring rod or the stem, ring magnets 6 and 7 under the influence of their magnetic fields, its closure occurs. The reed switch closure moment is fixed with a measuring device (not shown) relative to the reference system located on the surface. We (not shown). The measurements determine the mutual distance between the ring magnets b and 7.

The desired reactive pressure of the soil is determined by the distance between the ring magnets b and 7 on the basis of the preliminary calibration of the sensor.

Claims (1)

SENSOR FOR MEASUREMENTS OF REACTIVE PRESSURE OF SOIL, comprising a housing, a membrane and a measuring device located inside the housing, characterized in that, in order to increase reliability, the membrane is made with an annular stop, the housing is in the form of a glass with a bottom, and the measuring device is in the form two ring magnets interconnected by a spring, while one magnet is rigidly fixed to the bottom of the glass, and the other on the annular stop of the membrane mounted with the possibility of vertical movement inside the case.