Method for constructing special-shaped solid concrete structure through wet sprayed concrete technique

Abstract

The invention provides a method for constructing a special-shaped solid concrete structure through the wet sprayed concrete technique. The method comprises the following steps of constructing a special-shaped solid concrete structure building model; conducting batching on concrete materials, wherein dry mixed materials include cement, sand, stones, fiber, an anti-permeability agent and a water reducing agent; mixing the dry mixed materials with water; adding the mixed concrete into a spraying machine and spraying the mixed concrete onto the special-shaped solid concrete structure building model through an air pressure spraying system; trowelling and calendaring the concrete sprayed onto the building model when one-time spraying thickness reaches the design thickness of the concrete structure; and conducting maintenance on the concrete structure constructed through spraying. Through the method, the high-quality and high-precision special-shaped solid concrete structure can be obtained.

Description

technical field [0001] The invention relates to the technical field of shotcrete in construction engineering, and provides a method for constructing a special-shaped solid concrete structure by wet shotcrete. Background technique [0002] Shotcrete technology is gradually popularized and applied in concrete buildings because of its fast and efficient advantages. In the prior art, the shotcrete technology is mostly used for the construction of the concrete structure on the surface of the main body of the building. In addition, dry shotcrete is often used. Dry spraying is to mix cement, sand, gravel mixture and powder quick-setting agent with a water-cement ratio less than 0.25 evenly in a certain proportion, and then use a dry concrete sprayer, powered by compressed air, to pass through the delivery pipe Go to the nozzle, mix with a certain amount of pressure water, and spray it on the surface to be sprayed. Dry spraying has the following disadvantages: ①The amount of dust ...

AI Technical Summary

Problems solved by technology

Dry spraying has the following disadvantages: ①The amount of dust and rebound of the working flour is large, the working environment is harsh, and there is pulse phenomenon and poor uniformity when spraying; ②The actual water-cement mass ratio is not easy to control accurately, which affects the quality of sprayed concrete. Quality; ③Low production efficiency

The wet shotcrete method has less dust and the production environment is much better than that of the dry shotcrete method. However, in the prior art, due to the complexity of the shotcrete process, from the formula of the concrete to the various processes of the shotcrete process, as well as the various operating parameters in the shotcrete process , both affect the quality of the constructed concrete structure

Therefore, in the prior art, the wet shotcrete technology is only limited to the application range of setting concrete layers on the surface of the main structure in slope support engineering, etc., and it is still blank for the construction of solid concrete structures.

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