Long-distance wet type concrete spraying method

Abstract

The invention relates to a concrete spraying technology. A long-distance wet type concrete spraying method is characterized in that three conveying pipelines including a powdery-accelerating-agent-containing sand gravel conveying pipeline, a cement conveying pipeline and a high-pressure water path are adopted; in the powdery-accelerating-agent-containing sand gravel conveying pipeline, stirred powdery-accelerating-agent-containing sand gravel mixed materials are conveyed into the sand gravel conveying pipeline by a sand gravel conveying device; in the cement conveying pipeline, cement is conveyed into the cement conveying pipeline by a cement conveying device from a cement storage device; the tail end of the cement conveying pipeline is communicated with the sand gravel conveying pipeline and then enters a mixing pipeline; and the high-pressure water path is communicated with a position, with a distance of 0 to 15m from a spray head, on the mixing pipeline. Under the effect of air pressure, the sand gravel materials and the cement are stirred and mixed; the mixing effect is good; the rebounding of spraying materials can be effectively reduced; the occupied space is small; and the limitation of using large-scale stirring and conveying equipment for wet spraying is avoided. The long-distance wet type concrete spraying method has the advantages that the production efficiency is high; the moving is convenient; the maintenance is easy; and economic and social benefits are great.

Description

technical field [0001] The invention relates to a concrete spraying technology, in particular to a long-distance wet concrete spraying method. Background technique [0002] Shotcrete is the use of compressed air or other power to transport the mixed concrete aggregate and additives in a certain proportion through pipelines and spray them on the sprayed surface (rock wall, wall, tunnel lining, etc.) at high speed to solidify and harden. The formed concrete support layer. At present, concrete spraying machines at home and abroad are divided into dry spraying machines, tidal spraying machines and wet spraying machines. During the spraying operation of dry spraying machine and tidal spraying machine, a large amount of dust is formed due to the generation of residual air and the lax sealing of the machine, mainly cement dust, which seriously pollutes the environment and affects the health of the workers; The quality is poor, so it is gradually replaced by wet spray machines. W...

AI Technical Summary

Problems solved by technology

Frequent transfer of equipment and raw materials is required during construction, the labor intensity of construction personnel is high, and the production efficiency is low

[0003] The patent applied by the applicant before, the patent application number is: 201210226964.9 provides a wet shotcrete method, but it has the disadvantages of mixing cement with water in the early stage, poor conveying capacity, and there is still a certain limit to the spraying distance, and there is still a certain limit during cement mixing. During the post-transportation process, the cement sticks to the pipeline or the wall of the mixing tank is serious, and it is difficult to clean up. At the same time, it has higher requirements for the wind pressure of high-pressure air and higher requirements for the sealing performance of the pipeline. The pipeline will inevitably also cause some damage.

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