SU987107A1 - Guniting unit - Google Patents

Description

(54) INSTALLATION FOR THE TREATMENT OF CONCRETE

one

The invention relates to devices for the preparation and application of concrete mixtures to the surface and can be used in mining for fastening mine workings, as well as in hydraulic engineering.

A known installation for preparing and spraying a concrete mixture, consisting of a cart with tanks, water and compressed air supplies, a paddle type mixer with a drain window and a cutter 1.

The disadvantage of this setup is the large rebound of the constituents of the concrete mix, especially in the initial gunning stage.

Also known installation for torcre-. Concrete batching includes a metering device with bunkers, a paddle mixer with elastic brushes and a drain window in the housing, a blender with a main hose, an injection device with an inlet spout, a bypass grid, a shut-off valve, a nozzle with material and air hoses 2.

However, this installation produces a large rebound of the particles of the concrete mix, since it does not allow, in the process of shotcrete, to separate the mixture from the fine fraction, with a greater ability of adhesion, and to apply it with the first layer ("pillow") to the coarse fraction in subsequent layers.

The aim of the invention is to reduce the rebound of the constituents of the concrete mix from the surface to be coated.

This goal is achieved by the fact that

10 in an installation for the shotcrete of concrete, including a metering device with bunkers, a paddle mixer with elastic brushes and a drainage window in the housing, a solvent with main hose,

15 injection device with suction nozzle, overflow grid installed in the drain window, cut-off valve, nozzle with main and air hoses, drain window is made to the full height

2Q. the mixer body is vertically, and the suction nozzle is mounted for movement in the vertical direction and interacting with the screen, the screen being made with. variable cells, increasing from top to bottom.

FIG. 1 shows the installation, general view; in fig. 2 - section A-A. In FIG. one; in fig. 3 is a view B in FIG. one.

The plant for gunning of concrete consists of a metering device 1 with bunkers 2, a paddle mixer 3 with blades 4 and elastic brushes 5. and with a drain window 6 in the housing 7, plugged 8 with a main hose 9, a pressure device 10 with a suction nozzle 11. The installation includes a bypass grid 12, a cut-off device 13, a nozzle 14 with a material pipe 15 and an air hose 16.

The drain window 6 is made along the vertical forming 17 of the housing 7 from the top edge 18 to the bottom 19 of the mixer 3, and the suction nozzle 11 consisting of the suction neck 20 is mounted on a flexible tape - valve 21 and is mounted movably (by means of a screw mechanism 22) in vertical 23 and curved 24 guides. Around the drain box 6 on the contact between the housing 7 and the valve 21 is installed pack; The removal 25. The suction, the pipe 11 by the suction mouth 20 is in contact with the grid 12 installed in the drain window 6. The bypass grid 12 is made with cells 26 of variable cross section. The cross section of the cell 26 / zig is drained from the top edge 18 to the bottom 19 from the minimum size of the aggregate fraction to the size of the maximum pumped fraction by the injection device 10.

The installation works as follows.

The dry components of the concrete mix are fed through the dispenser 1 from the hopper 2 into the housing 7 of the mixer 3, and water from the main hose 9 enters it through the filling agent 8. The concrete mix is prepared with the shut-off valve 13 closed and lifted using the screw mechanism 22 of the suction nozzle 11 in the upper extreme position.

When preparing a concrete mix, natural separation of the concrete mix occurs, turning it into a non-uniform mass, heavy large particles are lowered to the bottom, small particles remain above. After preparing the concrete mix of the desired consistency, a slam-shut 13 opens, an injection device -10 is turned on and a fine-grained concrete mix is taken from the top of the mixer. The mixture pressure device 10 through

the suction nozzle 11, the material conduit 15 is directed to the nozzle 14, where it is picked up by compressed air from the main hose 16 and gunned to the surface. A primary layer of fine concrete is applied to the surface. The overflow mesh 12 with small cells 26 in the upper part eliminates accidental entry of coarse aggregates for gunning during the continuous operation of the dispenser and mixer when forming the primary layer "liner: After applying the primary layer of fine-grained concrete, the screw mechanism 22 lowers the suction nozzle 11 to the bottom part 19 by mixer 3 and gunning with coarse-grained concretes on the applied fine-grained concrete is made. olrgicheskogo cycle when gunning

NEW surface area.

A concrete shotcrete plant allows erecting multi-layer lining of increased strength and stability.

Claims (2)

1. USSR author's certificate for application number 2729832 / 22-03, cl. E 21 D 11/10, 1979. 2. USSR author's certificate for application No. 2778349 / 22-03, cl. E 21 D 11/10, 1979 2 i7 2 18 3 f f  . , V4-J T | / J 6 / y 2121 four W 15 25 FIG. one in id b FIG. 2 Fig.Z