Sprayed concrete for foundation pit slope, and construction method thereof

Abstract

The invention relates to a construction method of a sprayed concrete for a foundation pit slope. The sprayed concrete mainly comprises a grouting layer, a covering layer and a concrete layer, and the grouting layer comprises 20-50 parts of a water glass solution, 30-50 parts of garbage bottom slag powder, 1-10 parts of MgO, 10-20 parts of magnesium chloride and 50-100 parts of water; the garbage bottom slag powder needs to be immersed in a 0.05-0.2 mol / L hydrochloric acid solution for 1-3 h before being used, the mass ratio of the garbage bottom slag powder to the solution is 1: 10-1: 20, then a water glass solution is dropwise added into the bottom slag powder solution while stirring is conducted, the stirring speed is 10-30 r / min, the mass ratio of the water glass solution to the garbage bottom slag powder is 1: 30-1: 80, and then suction filtration, washing and drying are conducted; the covering layer comprises cotton and linen fibers and a water glass solution; and the concrete layer is prepared from 300-500 parts of cement clinker, 100-200 parts of lithium slag powder, 300-500 parts of ceramsite, 5-20 parts of ferric chloride, 10 -20 parts of microcrystalline cellulose and 120-150 parts of water. The problems that common sprayed concrete is prone to collapse and high in rebound rate are solved.

Description

technical field [0001] The invention belongs to the technical field of shotcrete, and in particular relates to a construction method of shotcrete for foundation pit slopes. Background technique [0002] Shotcrete is a kind of construction material that borrows relevant concrete spraying machinery to spray concrete, mortar and other materials onto the construction plane. It has been popularized and applied quickly due to its fast construction. However, at present, the rebound rate of shotcrete is relatively high—that is, the concrete material falls too much after being sprayed onto the construction plane. In addition, the construction plane is not firm. After spraying the concrete, the self-weight of the construction plane will increase, so that the construction plane will not be stable. The collapse brings a greater safety risk to the construction of shotcrete. [0003] Patent 202010916438X discloses a shotcrete and its construction method. A shotcrete is composed of a ceme...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems in the prior art that ordinary shotcrete has a high rebound rate and the construction plane is easy to collapse

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