SU688860A1 - Device for determining concrete surface hardness - Google Patents

Description

one

The invention relates to the field of testing materials, in particular, to devices for determining the surface hardness of concrete.

A device for determining the surface hardness of concrete is known, comprising a hollow body with handles fixed on the upper part and an emphasis fixed in the lower part, and a drummer, an indenter and an indicator of the movement of the indenter located in the cavity of the body 1.

This device is closest to the invention by its technical essence and the achieved result.

The drawback of the device is the low accuracy of determining the surface hardness due to the difficulty of ensuring that the indenter axis is strictly perpendicular to the surface of the tested concrete.

The purpose of the invention is to increase the accuracy of the definition.

To do this, in the proposed device, the emphasis is made in the form of a hollow rod with cutting edges at its end, designed to interact with the concrete surface, and the device is equipped with an eccentric sleeve concentrically mounted on the stop, and at least two eccentric bearings are installed2

in one another and put on an eccentric bushing.

The drawing shows a diagram of the device.

The device comprises a hollow cylindrical body 1 with handles 2 fixed on it in its upper part and an emphasis 3 made in the form of a hollow rod with cutting edges 4 on the end. In the cavity

housing 1 is placed drummer 5, interacting with the indenter 6, and the indicator 7, fixing the movement of the drummer 5 relative to the stop 3, which is concentrically fitted eccentric sleeve 8 with

at least two eccentric supports 9 and 10, mounted one inside the other and put on an eccentric sleeve 8. Support legs 11 are attached to the external surface of the support 10,

forming a tripod.

The device works as follows.

In the area of concrete to be investigated, the device is secured with

legs 11. By rotating the handle 2, transmitting the torque through the housing 1 to the support 3 with the recessing edges 4, and moving the eccentric bearing 9 and 10, cut out the area having a diameter

Lamnogo larger diameter stop. Then, the PS of this device with paws 11, the ground is polished and, by mixing eccentric bearings 9 and 10, select the places where the hardness of the concrete is determined by the depth of insertion of the indenter 6 relative to the drummer 5.

The use in the device of an emphasis 3 with cut, with their edges 4 allows to prepare a pad having a strict perpendicularity to the axis of the indenter 6, and the presence of eccentric bearings allows a series of measurements to be made at the prepared site without readjustment of the device.

Claims (1)

Invention Formula A device for determining the surface hardness of concrete, comprising a hollow body with handles fixed to its upper part, and the stop fixed in the lower part, and the drummer, the indenter and the indenter interleaving indicator located in the housing cavity, differing in that, in order to improve the determination accuracy, the stop is made in the form of a hollow rod with cutting edges on its end face, designed to interact with the surface of the concrete, and the device is equipped with an eccentric sleeve concentrically mounted on the stop, and at least two eccentric bearings mounted one inside the other and mounted on an eccentric sleeve. Information sources, taken into account during the examination 1. USSR author's certificate No. 246148, cl. G OSH 3/48, 1969 (prototype). YU Have