Nozzle device and construction method for improving concrete spraying quality

Abstract

The invention provides a sprayer device and a construction method for improving concrete spraying quality. The sprayer device comprises a sprayer body, wherein the sprayer body is provided with a sprayer expansion part and a sprayer cap arranged at the front end of the sprayer expansion part, multiple air holes and multiple concrete holes are formed in the sprayer cap, and the air holes are located on the periphery of the concrete holes; the sprayer expansion part is provided with two layers of cavities which are not communicated, the first layer of cavity is a high-pressure air delivery cavity which is communicated with a high-pressure air delivery pipe to charge high-pressure air, and the end part of the cavity is communicated with the air holes to spray the high-pressure air; the second layer of cavity is a concrete delivery cavity which is communicated with a concrete delivery pipe to charge concrete, and the end part of the cavity is communicated with the concrete holes to spray the concrete. According to the sprayer device and the construction method, concrete spraying rebounding and splashing can be effectively reduced, thereby fulfilling the aim of improving the concrete spraying quality.

Description

technical field [0001] The invention relates to a construction technology in the technical field of underground construction engineering, in particular to a spray head device and a construction method for improving the quality of concrete spraying. Background technique [0002] The mining method has the characteristics of high construction efficiency and strong economy, and is one of the main construction methods of underground tunnels. This construction method needs to excavate the entire section to the design outline first, and then build the lining. When the ground is soft, it can be carried out with simple mechanical tools. According to the stability of the surrounding rock, it should be excavated and supported when necessary. protect. During the primary support and secondary lining, it is necessary to spray concrete to the side wall of the tunnel, which helps to seal the surrounding rock, prevent the relaxation and weathering of the surrounding rock, and form a joint s...

AI Technical Summary

Problems solved by technology

"The nozzle device for reducing the rebound rate of sprayed concrete described in this patent needs to adjust the spraying direction of the nozzle to be perpendicular to the working surface according to the angle between the nozzle and the spraying working surface during the actual use of the project, which is difficult to work; The design that the flow direction of the agent is at an obtuse angle to the flow direction of the concrete may easily cause problems such as difficulty in the flow of the accelerator into the concrete pipe and blockage of the pipe caused by the influx of concrete into the pipe of the accelerator.

Therefore, the nozzle device for reducing the rebound rate of sprayed concrete described in this patent fails to effectively reduce the rebound rate of sprayed concrete, and has disadvantages such as difficult construction, low reliability, and hidden dangers of pipe plugging.

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