RU36142U1 - Device for determining the strength of concrete - Google Patents

Description

A device for determining the strength of concrete.

The utility model relates to the field of material quality control instruments, namely to mechanical methods of non-destructive testing of concrete.

A device for determining the strength of concrete by shearing, including a housing, a mechanical press containing a manual drive, a recording device and an anchor device / 1 /.

The disadvantages of the known device is that when tested by shearing it is impossible to obtain a stable sample size, and therefore the strength of concrete is determined by the indirect method, which is rather laborious, since preliminary construction of the calibration curve is necessary. In addition, the known device provides the possibility of only one type of test method shearing.

The technical problem is to expand the technical capabilities of the device for determining the physico-mechanical characteristics of concrete by the method of non-destructive testing.

The problem is solved in such a way that in the device for determining the strength of concrete, including the casing, a mechanical press containing a drive, a recording device and an anchor device, according to a utility model, the mechanical press is made of a gear worm gear connected to a floating screw pair

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nut, the screw of the screw pair is rigidly connected to the anchor device, made in the form of a cone head with an expanding nut, and has a locking nut, and the device is equipped with adjustable supports.

The difference of the proposed device is that the mechanical press is made of a gear worm gear connected to a screw pair by a floating nut, the screw of the screw pair is rigidly connected to an anchor device made in the form of a cone head with an expanding nut, and has a fixing nut, and the device is equipped with adjustable supports.

The technical result of the mechanical press in the form of a worm gear connected to the anchor device with a floating nut of a screw pair and equipped with a stopper is that as a result of the translational and rotational movement of the anchor, it becomes possible to act on concrete in both axial and radial directions, and provides obtaining certain sizes of concrete samples, which makes it possible with one device to directly determine several physico-mechanical characteristics of concrete (firmly be compressive, tensile, shear) directly in the building structure. Moreover, the implementation of the anchor device provides reliable adhesion to concrete and the direct transmission of the breaking force, which makes it possible to increase the accuracy of determination.

The device consists of a housing 1, a mechanical drive 2, a worm 3 with a gear 4, a screw pair 5 with a floating nut 6. A screw pair 5 is connected to an anchor device, including a threaded pair of a conical head 7 and an expanding nut 8. The threaded pair is clamped by a fixing nut 9 The floating nut 6 rests on a self-adjusting bearing support 10 and is fixed relative to the screw pair by the stop 11. A recording device 12 for measuring the breaking load connected to the drive is mounted on the housing 1. The device has adjustable supports 13.

The device operates as follows. To determine the strength of concrete by tearing in the concrete body of the structure, a hole 14 is first drilled in proportion to the diameter of the expanding nut 8 of the anchor device to a depth not less than the installation length of the expanding nut. Then, coaxially with the hole 14 in the concrete body, an annular groove 15 is cut to the depth of the hole with a diameter corresponding to the size of the sample. In the annular groove 15 to a depth equal to the installation length of the expanding nut 8, a metal ring is placed with a diameter commensurate with the diameter of the annular groove. The ring is mounted on quick-hardening glue for a snug fit to the sample. After that, a device for determining the strength is installed so that the anchor device is placed in the hole 14 and secured by screwing the cone head 7 into the expandable nut 8 until it is fixed by the sample and tighten

fixing nut 9. The position of the device is adjusted using supports 13. When the drive 2 is rotated by means of a worm gear, we move the floating nut 6, which, having reached the self-aligning bearing support 10, transfers axial force to screw 5 until the sample is destroyed. At the time of the destruction of the sample, readings are taken from the flaps of the recording device 12. The tensile strength of the test concrete is determined by the force of the destruction and the size of the sample.

To determine the strength of concrete by torsion. The device is installed in a similar manner and the floating nut 6 is fixed relative to the screw 5 by the stop 11. When the drive 2 is rotated, the floating nut rotates the anchor device until the sample is destroyed and the concrete shear strength is determined.

To determine the strength of concrete by shearing, the device is installed in borehole in the absence of a metal ring. Unscrew the clamping nut 9 until a gap appears between it and the expanding nut 8. Next, unscrew the floating nut until a gap appears between it and the self-adjusting bearing 10 and install the stopper 11.

When the drive 2 is rotated, the floating nut rotates the cone head 7 of the anchor device until the sample is destroyed and the tensile strength of the concrete is determined.

Sources of information:

Claims (1)

A device for determining the strength of concrete, comprising a housing, a mechanical press containing a drive, a recording device and an anchor device, characterized in that the mechanical press consists of a gear worm gear, a screw pair and an anchor device rigidly connected to the screw, the screw pair contains mounted on a support a floating nut, a stopper and a fixing nut of an anchor device made in the form of a conical screw pair with an expanding nut, while the device is equipped with adjustable vertical supports .