SU932369A1 - Device for mechanical testing of concrete - Google Patents

Description

The invention relates to testing the mechanical properties of solid materials by applying mechanical forces to them, in particular, to determining the strength of concrete by local destruction.

A device for mechanical testing of building structures, a base with racks, crossbars fixed on them and loading hydraulic jacks connected by means of a hydraulic system to a pump station 1, is known.

A disadvantage of this device is the great laboriousness of the tests, associated with the installation of the pull-rod, crossbars and hydraulic jacks, and their low productivity.

The closest in technical essence and the achieved effect to the proposed is a device for mechanical testing of concrete, containing a load frame, a loading mechanism placed on it, made in the form of a hydraulic system, and an element in contact with the surface of the concrete and interacting with the loading mechanism 2.

However, a single device does not allow for tests to determine the strength of concrete by methods of local destruction.

The chain of the invention is the mechanical testing of concrete by methods of local destruction.

This goal is achieved by the fact that the device is equipped with a supporting element with holes fixed on the load frame and clamps made 10 in the form of disks and rigidly connected to them and perpendicular to them, rods mounted with the possibility of peremaceni in the holes of the supporting element.

15

The drawing shows the device.

The device contains a power frame 1, a loading mechanism, dispensed on it, made in the form of a hydro20 system, including hydraulic jacks 2, connecting pipes 3 and the control unit 4. The elements 5 in contact with the surface of the hydraulic jacks 2 are attached to the stem 2

25 concrete 6. BetN 6. rests on the power frame. Frame 1 through the supports 7. On the load frame 1, a support element 8 is fixed with openings in which clamps consisting of discs 9 are moved.

30 and rods 10 rigidly connected to each other. The clamps are rigidly fixed on the rods of the hydraulic jacks 2. The device operates as follows. The supports 7 of the force frame 1 are laid with the tested concrete b. The control unit 4 increases the pressure in the cylinders of the hydraulic jacks 2, in which the same forces develop. The load is transferred to concrete b through elements 5. When the critical load is reached in the least durable part of the product, local destruction occurs, after which element 5 slips into concrete b and the latch disk 9 abuts against support element 8. Further pressure in the system rises to create in hydraulic jacks 2 the load at which local destruction occurs in the least durable of the remaining sections of the application of the load. In this sequence, a test occurs before using all elements 5 that come into contact with concrete b in different areas. The proposed device, in contrast to the known, allows realizing methods of local destruction according to GOST 52690.3-77, GOST 22690.4-77, GOST 21243-75, etc.

Claims (1)

The invention The device for mechanical testing of concrete, containing a load frame, a loading mechanism placed on it, made in the form of a hydraulic system, and an element in contact with the surface of the concrete and interacting with the loading mechanism, with the aim of carrying out mechanical tests of concrete by the method of local destruction, it is provided with a support element with openings fixed on the load frame and clamps made in the form of disks and rigidly connected with them and perpendicularly arranged m to them rods mounted for movement in the holes of the support element. Sources of information taken into account in the examination 1.A. Tamarin Testing and evaluation of the bearing properties of prestressed concrete structures. M., stroiizdat, 1967, pp. 58,69,91-92. 2, Novgorodsky M.A.Poperative control in the production of reinforced concrete products and structures, M, Higher School, 1967 p. 172 (prototype).