SU894423A1 - Device for sampling loose material - Google Patents

Description

(54) DEVICE FOR SELECTING SAMPLES OF BULK MATERIAL

one

The invention relates to the construction and can be used to assess the quality of compaction of bulk material such as gravel soil or high-stiff low-cement concrete compacted by rolling.

A soil sampling device is known, namely a drilling rig, with which core samples 1 are drilled from an array of soil or concrete.

This device does not allow for a sufficiently prompt investigation of the properties of the laid and compacted material. In particular, it does not allow to determine the density of the material directly at the work site and, thus, quickly and quickly change the mode of operation of the machine and respond to changes in soil compaction conditions.

The closest in technical essence and the achieved result is a device for sampling bulk material, compacted by rolling and containing a ring, which is immersed in the ground, and then remove the ring together with the ground 2.

Its disadvantage is that it cannot be used for sampling of gravel or special high-grade low-cement concrete mixture, since the inclusion of gravel and rubble does not allow the ring to cut into the soil. In addition, the introduction of cutting rings into the compacted soil in a certain way disrupts its structure and, thus, reduces the accuracy of determining the volumetric weight.

The purpose of the invention is to increase the operability and accuracy of determining the degree of compaction.

The goal is achieved by the fact that in the device for sampling bulk material compacted by rolling, and containing a ring, the ring is made telescopic with detachable upper and inner parts and is provided with a grille from the bottom, with vertical guides attached to the lower part him slings covering the top

20 part of the ring, and part of the ring is made detachable.

The device is equipped with a displacement sensor located inside the ring.

FIG. 1 shows a section BB in FIG. 2 .; in fig. 2 is a view A of FIG. one; in fig. 3 - the device, a longitudinal section.

The device for sampling bulk material compacted by rolling includes a telescopic ring consisting of a lower part 1 placed inside the upper part 2. Vertical guides 3 are rigidly attached to the lower part 1 of the ring, covering the upper part of the ring. From below, the ring is provided with a cushion 4, which is made, for example, at one with the guides 3. The holes 5 are attached to the rings of the guides, to which the slings 6 are attached. On the outer side of the upper part of the ring there is a circular cavity 7, mainly conic section with holes for and cables. The upper 2 and lower 1 parts of the ring are made detachable and are connected to each other using rubber straps 8 and 9. Inside the device is placed a displacement sensor 10, for example, of the capacitive type.

The device works as follows

The device is installed on the surface of a previously laid layer of material. The next layer of material is laid and the device is backfilled. After leveling the poured material to the required thickness, the upper part 2 of the ring is raised to the level of the surface of the layer and left in that position. The roller, moving across the material, compacts it. There is a sediment layer. When this happens, the upper part of the ring also settles, its movement down along the guides 3. The lower part of the ring 2 settles during each pass of the roller until the material in the layer is compacted. The end of the compaction of the material is shown by the sensor 10 movements.

Simultaneously with the deposition of the surface of the layer, a redistribution of the material inside the layer occurs. In this case, the particles of the material in the general direction of movement downward move in other directions. The effect of the walls of the rings is insignificant in this case, since, since the rings are made detachable, the walls expand. Then the straps 6 are attached to the lifting mechanism and remove the entire device with the compacted material in it.

The device with the material is ignored, then the weight of the device itself is subtracted and the weight of the material is obtained. Then, knowing exactly the volume of the material in the device and its weight, the density of the material is calculated. If studies are carried out on compaction by rolling with an especially rigid low-cement concrete mix, it may be necessary to investigate a sample of concrete obtained from it. In this case, the concrete mixture in the sampler is left to harden, and after some time, the walls of the rings are expanded, freeing the sample

concrete.

The proposed device allows you to quickly, fairly accurately determine the degree of compaction of the gravel material, and also to obtain core samples from hard

material.

Claims (2)

Invention Formula t A device for taking samples of bulk material compacted by rolling, including a ring, characterized in that, in order to increase the speed and accuracy of determining the degree of compaction, the ring is made telescopic with detachable upper and lower parts and provided with a lattice installed in its lower part and vertical guides with slings covering the top of the ring. 2. A device according to claim 1, characterized in that, in order to determine the moment when the seal ends, it is provided with a displacement sensor located inside the ring. Sources of information taken into account in the examination 1. Kozlovsky A. E. Nova technique and technology exploration drilling. M., “Nedra, 1972. 2. Neklyudov MK Reference manual for mechanized soil compaction. M., “Mechanical Engineering, 1965, p. 194. about i. about . .0  about .-. L at X / -  . 1 L .g, .-- iV. ix y 7 /