Heap sprayed concrete rapid wall constructing method for coal mine underground

Abstract

The invention discloses a heap sprayed concrete rapid wall constructing method for coal mine underground, and belongs to the technical field of constructing a concrete wall and concrete spraying in the coal mine underground. The heap sprayed concrete rapid wall constructing method for the coal mine underground can solve the problems that an existing method for constructing the concrete wall in thecoal mine underground is low in speed, the final strength cannot meet the design requirements, no effective support is formed for a roof and the application range is small. A novel method for rapidlyconstructing a concrete wall for the coal mine underground comprises the steps that sand-gravel materials, cement, a JCT-1 shotcrete admixture and an accelerating agent are mixed uniformly in a certain proportion in a wet state and then loaded into an injection machine, and compressed air is used for transporting the wet mixture to a spray nozzle along a pipeline to be mixed with water and sprayed at a high speed to construct the wall. According to the heap sprayed concrete rapid wall constructing method for the coal mine underground, the wall is easy to form, initial setting time is short, initial strength of heap spraying forming is high, no slip and falling deformation is caused, and the thickness of the wall is not limited.

Description

technical field [0001] The invention belongs to the technical field of constructing concrete walls and sprayed concrete underground in coal mines, and in particular relates to a rapid wall-building method of heap shotcrete for underground coal mines. Background technique [0002] Concrete has become one of the most important civil engineering materials due to its advantages of high strength, integrity and durability. Concrete walls are generally cast by formwork. The specific process is to use cement as the cementitious material and sand and stone as the aggregate. It is mixed with water in a certain proportion (admixtures and admixtures may be included), and the stirred concrete is poured in the set-up formwork, densely formed, and the formwork is disassembled after curing and hardening. The shaped formwork is very important to the structural size and forming quality of the concrete wall. Unqualified support of the shaped formwork can cause quality defects such as grout lea...

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Problems solved by technology

[0009] The present invention aims at the problems that the existing method for constructing concrete walls underground in coal mines is slow, the final strength cannot meet the design requirements, effective support for the roof cannot be formed, and the application range is small, and provides a rapid construction method of heap shotcrete for underground coal mines. In the wall method, the present invention mixes sand and gravel, cement, JCT-1 sprayed concrete admixture and quick-setting agent in a certain proportion in a wet state, and then puts them into the sprayer, and uses compressed air to transport the wet mixture to the spray head along the pipeline. mixed with water and sprayed at high speed to build walls

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