RU213352U1 - Shotcrete applicator - Google Patents

Abstract

The utility model relates to construction tools, namely to devices for creating shotcrete supports for chambers and approach workings during the construction of subways. The technical result of the utility model is the expansion of the arsenal of technical means that make it possible to fasten chambers and approach workings with shotcrete during the construction of subways. This device for spraying concrete contains a bucket (1) with a mixing chamber (2) in the lower part and nozzles (3) rigidly mounted on the front wall of the mixing chamber (2), a handle (4) with a shut-off valve (5) and a nipple (6) to supply compressed air at the end of the handle (4). The handle (4) is equipped with a clutch (7) with a dispenser (8). The coupling (7) has a cone-shaped part that enters the mixing chamber (2) from the rear wall. The dispenser (8) is rigidly connected to the tank tube (9) rigidly attached to the rear wall of the bucket (1) in its upper part. 1 ill.

Description

The utility model relates to construction tools, namely to devices for creating shotcrete supports for chambers and approach workings during the construction of subways.

A device for wet shotcrete (EN 2398081, E04F 21/12, 27.08.2010) containing a mixer-activator and a feeder body articulated with it with a rotor with rubber blades, purge holes; housing of the mixer-activator, made in the form of a truncated cone with an upper loading window and a hole for the exit of the mixture in the lower part of the end of the conical housing, and the hollow shaft of the screw connects the drive of the motor-reducer with the feeder rotor, and the screw mixer in the expanded part is equipped with blades pushing the mixture to the opening of the rotary feeder, where, in turn, the feeder blades lift the mixture to the purge hole and the aerosol mixer, and in the shaft cavity on one axis there is an air duct from the compressor to the aerosol mixer, equipped with a device that feeds liquid additives into it.

The disadvantage of this installation is the complexity of maintaining the machine, which consists in its mandatory flushing at the end of the working cycle, as well as the complexity of repair due to the large number of moving parts (motor, blades, etc.).

Known shotcrete machine with continuous loading (RU 2117123, E04F 21/12, 10.08.1998), containing a closed vibrobunker with a cone valve pivotally mounted on a rocker with a counterweight, an ejection chamber with an ejected tube connected to a source of compressed air, a material conduit with a nozzle connected to a water supply source; the internal cavity of the closed vibrobunker is connected through a reducer with a pressure gauge; and a three-way valve with an ejected tube.

The disadvantage of this installation is its large overall dimensions, which makes it difficult to work in cramped conditions of the chambers and the approach workings of the subway.

The closest technical solution to the claimed utility model is the KSh-4 plaster hopper bucket (https://www.kubaninstmment.ra/upload/iblock/5ef/5ef9be98e53bf137715a825b880a1737.pdf), containing a bucket with a mixing chamber in the lower part and nozzles, rigid mounted on the front wall of the mixing chamber, a handle rigidly connected to the mixing chamber with a shut-off valve and a nipple for supplying compressed air at the end of the handle.

The plaster hopper bucket is a hand tool that works cyclically. As the ladle is emptied when the plaster mixture is applied to the surface to be treated, a new portion of the plaster mixture is fed into the ladle, or it is scooped up by the ladle itself from the concrete mixer or mixing tank.

The disadvantage of the prototype is the impossibility of using it to create shotcrete lining chambers and approach workings during the construction of subways. Replacing the plaster mixture with a concrete mixture (it should be understood as a cement-sand mixture with aggregate up to 5 mm in size and a setting accelerator additive) is not possible due to the beginning of its setting in a concrete mixer or mixing tank until the end of work. Loading the setting accelerator directly into the bucket is inefficient due to uneven mixing of the setting accelerator with the rest of the concrete mix.

The objective of the utility model is to expand the arsenal of technical means that make it possible to fasten chambers and approach workings with shotcrete during the construction of subways.

The technical result is achieved by the fact that in the device for applying shotcrete, containing a bucket with a mixing chamber in the lower part and nozzles rigidly mounted on the front wall of the mixing chamber, a handle with a shut-off valve and a nipple for supplying compressed air at the end of the handle, the handle is equipped with a clutch with a dispenser, which has a conical part entering the mixing chamber from the side of the rear wall, and the dispenser is rigidly connected to the tube of the tank, rigidly attached to the rear wall of the bucket in its upper part.

The essence of the utility model is illustrated by a drawing, which shows a general view of the device.

The device for spraying concrete contains a bucket 1 with a mixing chamber 2 in the lower part and nozzles 3 rigidly mounted on the front wall of the mixing chamber 2, a handle 4 with a shut-off valve 5 and a nipple 6 for supplying compressed air at the end of the handle 4. The handle 4 is equipped with coupling 7 with a dispenser 8. The coupling 7 has a cone-shaped part that enters the mixing chamber 2 from the side of the rear wall. The dispenser 8 is rigidly connected to the tube of the tank 9, which is rigidly attached to the rear wall of the bucket 1 in its upper part.

The operation of the device is as follows. Through the nipple 6 at the end of the handle 4, compressed air is supplied to the device. Concrete mixture is loaded into bucket 1. When the shut-off valve 5 is pressed, compressed air passes through the handle 4, the coupling 7, the mixing chamber 2 of the bucket 1 and flies out of the nozzles 3 onto the applied surface. In clutch 7, an additive is captured by a jet of compressed air (concrete hardening accelerator according to GOST 24211-2008 "Additives for concrete and mortar. General technical conditions"), entering the clutch 7 through a tube from tank 9. The amount of additive is regulated by a dispenser 8. In the chamber mixing 2, the components of the concrete mixture are uniformly mixed with the setting accelerator additive, as a result of which a layer of shotcrete is formed on the applied surface.

Compared with the prototype, the device allows the fastening of chambers and approach workings with shotcrete during the construction of subways.

Claims (1)

Shotcrete applicator, comprising a bucket with a mixing chamber in the lower part and nozzles rigidly mounted on the front wall of the mixing chamber, a handle with a shut-off valve and a nipple for supplying compressed air at the end of the handle, characterized in that the handle is equipped with a coupling with a dispenser, which has a cone-shaped part entering the mixing chamber from the side of the rear wall, and the dispenser is rigidly connected to the tube of the tank, rigidly attached to the rear wall of the bucket in its upper part.

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