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Three-dimensional heat-insulating reinforced concrete liner for mines

A technology of reinforced concrete and concrete, which is applied in shaft lining, tunnel lining, mining equipment, etc., can solve problems such as mine roadway temperature, insufficient heat insulation effect, and uneven spraying, so as to achieve full utilization of compressive strength and meet Roadway heat insulation and simple process

Active Publication Date: 2016-03-16
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used cooling methods in mines include ventilation cooling and refrigeration cooling, neither of which can effectively reduce the temperature of mine roadways, and ventilation and cooling are likely to cause dust to fly. Refrigeration cooling requires a lot of energy due to the large amount of heat exchange with the roadway
The current heat insulation method is to directly spray the heat insulation material on the roadway rocks, but this heat insulation method is often not sprayed uniformly, and it is easy to fall off, and the heat insulation effect is insufficient

Method used

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  • Three-dimensional heat-insulating reinforced concrete liner for mines
  • Three-dimensional heat-insulating reinforced concrete liner for mines
  • Three-dimensional heat-insulating reinforced concrete liner for mines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A heat-insulating three-dimensional reinforced concrete lining for a mine is composed of two parts: a three-dimensional reinforced reticulated shell support (1) and a heat-insulating support concrete sprayed layer (2).

[0034] The three-dimensional reinforced reticulated shell support (1) is a fully enclosed three-core arch, which is divided into 7 reticulated shell members according to the section of the roadway, including 1 top reticulated shell (3), 2 mirrored upper reticulated shells (4), 2 The lower reticulated shell (5) and two bottom reticulated shells (6) are assembled, wherein the central angle of the top reticulated shell (3) is 60°, and the central angle of the upper reticulated shell (4) at 4 / 7 of the arc surface is 25° °, the central angle at 3 / 7 of the arc surface is 15°, the central angle of the lower reticulated shell (5) is 36°21'31", the grid width is 700mm, and each piece is composed of 2 Φ22 main arc ribs (10), 6 Φ20 secondary arc ribs (12), several...

Embodiment 2

[0041] The thermal insulation support concrete spraying layer (2) includes the following raw materials: cementitious material, gravel, sand, water, ceramsite, vitrified microbeads, polypropylene fiber, early strength agent, quick setting agent and water reducing agent. Cementitious material: gravel: sand: water weight ratio is 1:0.78:0.78:0.45. Cementitious materials include cement and fly ash, fly ash accounts for 5% of the total mass of cementitious materials, ceramsite is fly ash ceramsite, particle size is 10-15mm, mass is 10% of stone mass, vitrified micro The beads are hydrophobic vitrified microbeads, the mass is 5% of the mass of the sand, the polypropylene fiber is bundled monofilament polypropylene fiber, the length is 14-18mm, the diameter or equivalent diameter is 3-60μm, and the dosage is 0.95Kg / m3, early strength agent, quick-setting agent, and water reducer are 3.5%, 4%, and 0.6% of the cement mass, respectively.

[0042] Other conditions are identical with em...

Embodiment 3

[0044] The thermal insulation support concrete spraying layer (2) includes the following raw materials: cementitious material, gravel, sand, water, ceramsite, vitrified microbeads, polypropylene fiber, early strength agent, quick setting agent and water reducing agent. Cementitious material: gravel: sand: water weight ratio is 1:0.78:0.78:0.45. Cementitious materials include cement and fly ash. Fly ash accounts for 20% of the total mass of the cementitious material. Hydrophobic vitrified microbeads, the mass is 20% of the mass of the sand, the polypropylene fiber is bundled monofilament polypropylene fiber, the length is 14-18mm, the diameter or equivalent diameter is 3-60μm, and the dosage is 1.5Kg / m3 , Early strength agent, quick-setting agent, and water reducer are 5%, 3%, and 1.1% of the cement mass, respectively.

[0045] Other conditions are identical with embodiment 1.

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Abstract

The invention provides a three-dimensional heat-insulating reinforced concrete liner for mines. The three-dimensional heat-insulating reinforced concrete liner consists of two parts of a three-dimensional reinforced mesh casing bracket and a heat insulating support concrete spraying layer, wherein the three-dimensional reinforced mesh casing bracket is a full-closed three-center arch which is spliced from several mesh casing structural members and is fixed on the surface of country rock, so that an external support framework is formed, ground pressure is jointly withstood by the external support framework and a rock consolidation ring; heat insulating support concrete is formed by mixing haydite, vitrified micro bubbles, polypropylene fibers and common concrete, and is packed in the mesh casing bracket. The vitrified micro bubbles and haydite form a porous structure in the concrete, so that the coefficient of thermal conductivity is effectively reduced, and concrete has a good heat-insulating effect; the heat insulating concrete is sprayed and coated to a three-dimensional reinforced mesh casing, the concrete is packaged in numerous small-span bidirectional reinforcing bar arch casings, pulling and shearing stress borne by the spraying layer is obviously reduced, and the compressive strength is fully utilized, so that the requirement for the heat insulating support of tunnels can be well met, the healthy body and mind of staff working underground can be guaranteed, and the working efficiency in the underground mines is improved.

Description

technical field [0001] The invention relates to coal mine roadway heat insulation technology, in particular to a mine heat insulation three-dimensional reinforced concrete lining. Background technique [0002] With the increase of the mining life of coal mines in our country, the mining depth gradually goes deep into the ground, and the influence of geothermal heat is becoming more and more serious. High temperature and high humidity environment will seriously affect the production efficiency and safety of underground operators. Miners work for a long time in a high temperature and high humidity environment, which will cause body temperature to rise, metabolism disorder, heat stroke, vomiting, fainting, eczema and other diseases, and even death in severe cases, resulting in a decrease in labor productivity and an increase in the rate of production accidents . According to the regulations promulgated by the state "Coal Mine Safety Regulations", the air temperature of the mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/38E21D11/10C04B28/00
Inventor 庞建勇姚韦靖薛俊华
Owner ANHUI UNIV OF SCI & TECH
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