Heap sprayed concrete rapid wall constructing method for coal mine underground

A technology of concrete and concrete admixture, which is applied in the direction of earth square drilling, mining equipment, mining equipment, etc., can solve the problems of inability to form effective roof support, insufficient strength, and small application range, so as to reduce labor intensity and cost of workers The effect of low and liberating labor intensity

Active Publication Date: 2018-11-16
TAIYUAN UNIV OF TECH
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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

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  • Heap sprayed concrete rapid wall constructing method for coal mine underground
  • Heap sprayed concrete rapid wall constructing method for coal mine underground
  • Heap sprayed concrete rapid wall constructing method for coal mine underground

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Embodiment Construction

[0039] A method for rapidly building a wall with shotcrete for underground coal mines, comprising the following steps:

[0040] The first step is to knock on the roof to remove the living gangue in the roof area of ​​the designed and constructed wall of the coal mine, remove the scum of the bottom plate in the designed wall area and find the hard bottom;

[0041] The second step is to place prefabricated reinforcement cages within the scope of the wall, and tie and connect the reinforcement cages with 16# tying wires; the width of the reinforcement cages is consistent with the width of the wall to control the forming size of the walls; the height and length of the reinforcement cages Equal to the height and length of the designed wall;

[0042] In the third step, according to the volume of the concrete wall constructed by the underground spraying, the raw materials of the spraying concrete are prepared on the ground according to the mass ratio of cement: sand: gravel: JCT-1 sp...

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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...

Claims

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Application Information

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IPC IPC(8): E21F17/103C04B28/04
CPCC04B28/04C04B2111/00155E21F17/103C04B14/06C04B14/02C04B2103/0068
Inventor 郝兵元任兴云李铁良李丰亮李强
Owner TAIYUAN UNIV OF TECH
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