SU922505A1 - Device for measuring clearances - Google Patents

Description

(, 5) DEVICE FOR MEASURING GASES

The device relates to a non-destructive testing instrument and can be used in hydraulic construction and hydraulic structures.

A device for measuring gaps in cracks and seams of hydraulic structures, made in the form of dimensional lines with nonius CPs, is known. The disadvantage of these devices is that only surface gaps can be changed with their help.

Closest to the proposed technical entity is a device for measuring gaps, containing a distribution membrane box filled with a fluid fluid and connected to the box measuring tip and the recorder 21.

A disadvantage of this device is the inability to ensure its reliable operation and accuracy in terms of placement between the elements of the underground hydraulic structure when exposed to pressure of groundwater.

The purpose of the invention is to increase the reliability and accuracy of measurement.

This goal is achieved by the fact that the device is equipped with a pressure sensor and a casing with openings enclosing the box for communicating the cavity formed between them with the cavity of the measured gap, measuring

10, the tip is mounted to move in one of the openings of the casing, and the pressure sensor is connected to a cavity between the box and the casing and is connected to the recorder.

15

FIG. 1 shows a structural diagram of the device; in fig. 2 is a diagram of its installation.

Claims (2)

The device consists of a casing 1 enclosing a sprung membrane 20 box 2 filled with a thin fluid, connected to a box of measuring tip 3, jaiaT4HKa pressure and registrar 5. connected by lines 6 and 7 of communication, respectively, to box 2 and a pressure sensor. The casing with the openings 8 communicates with the cavity of the controlled clearance 9. The pressure sensor k communicates with the internal cavity formed by the box and the casing. The device works as follows. When constructing an underground hydraulic structure, for example, a conduit consisting of a concrete ring 10 and a steel shell 11, after mounting the steel shell, a device for measuring gaps is fixed on it and the box 2 and sensor k are connected to the recorder 5 by lines 6 and 7 . At the same time, the measuring tip 3 contacts the steel shell 11. After installing the device, the shell is concreted together with it. Before installing the device in the water conduit, it is calibrated in laboratory conditions. During the operation of the conduit, due to the natural penetration of groundwater into the casing, the box 2 is crimped, and the pressure of this water is determined using a pressure sensor j on the recorder 5. Possible natural crimping of the box 2 from groundwater and the pressure of the water inside the steel shell is taken into account when tapping the device. When emptying the duct and unloading it from the internal pressure of the water, the steel shell of the duct begins to deform inward under the action of groundwater and a gap is formed between the steel shell and the concrete ring. In this gap, under the action of the junction box 2, the tip 3, which contacts the conduit shell, moves. From the deformation of the box, due to the increase in its volume, the size of the gap on the recorder is determined. Thus, the device makes it possible to reliably ensure remote registration of measurements of gaps between elements of a hydraulic structure. At the same time, the accuracy of measurements is ensured by an appropriate choice of the box design and recording systems, and the case design must withstand loads. under the action of elements of hydraulic structures and the pressure of water acting on them. Apparatus of the Invention A device for measuring gaps, comprising a sprung membrane box filled with a fluid liquid Pp and a measuring tip connected to the box, and a measuring tip, characterized in that, in order to increase reliability and accuracy of measurement, it is equipped with a pressure sensor and a casing with holes with an opening for the box communication of the cavity formed between them with the cavity of the measured gap, the measuring tip is mounted for movement in one of the holes of the casing, and the sensor pressure is communicated with the cavity between the box and the case and is connected with the recorder. Sources of information taken into account in the examination 1. M.Grishin M. Hydraulic structures. M., Mashgiz, 19b2, p. 75 2. USSR author's certificate fP 6581, cl. G 01 13/00, 1927 (prototype).