Nozzle structure for spraying concrete

Abstract

The invention discloses a nozzle structure for spraying concrete and belongs to the technical field of nozzles. The nozzle structure is characterized by comprising a first mixing pipe, a second mixingpipe and a spraying pipe which are sequentially connected with a concrete conveying pipe, wherein a plurality of first through holes for introducing an accelerator and air into the pipe are formed ina lateral wall of the first mixing pipe, a drainage plate corresponding to the plurality of first through holes is arranged in the first mixing pipe, a through hole unit which is circumferentially distributed is arranged on the drainage plate, the through hole unit comprises a second through hole extending from the outer side of the upper surface of the drainage plate to the inner side of the lower surface of the drainage plate and a third through hole extending from the inner side of the upper surface of the drainage plate to the outer side of the lower surface of the drainage plate, and thesecond through hole and the third through hole are distributed in a cross mode and are respectively and independently arranged. The nozzle structure disclosed by the invention has the characteristicsthat an inner layer and an outer layer of concrete in the pipe can both contact the accelerant and water, the concrete can be mixed more fully and evenly, and a resilience value of spraying concreteis reduced.

Description

technical field [0001] The present invention relates to nozzles, and more particularly to a nozzle structure for spraying concrete. Background technique [0002] At present, concrete spraying technology uses compressed gas or other means to provide power by means of a concrete spraying machine, and has a nozzle to spray concrete onto the surface to be sprayed, so that the concrete can quickly harden and harden, so as to achieve the goal. The key to this technology is whether the concrete is mixed evenly under the action of the quick-setting agent and air, and its uniformity will have a major impact on reducing the rebound of the concrete and improving the construction quality. Existing nozzles inject quick-setting agent and air through the outer wall so that the internal concrete can contact it, but this will make the concrete in the pipe only contact with the part near the inner wall of the nozzle to get the quick-setting agent, while the concrete in the center is not in co...

AI Technical Summary

Problems solved by technology

Existing nozzles inject quick-setting agent and air through the outer wall so that the inner concrete can contact it, but this will make the concrete in the pipe only contact with the part near the inner wall of the nozzle to get the quick-setting agent, while the concrete in the center is not in contact with it. The quick-setting agent is fully mixed, so that it cannot solidify quickly after spraying, which increases the rebound amount of shotcrete during construction, and the dust concentration generated increases, which seriously affects the construction environment

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