CN112194416A - Novel roadway sprayed concrete heat insulation layer and application method thereof - Google Patents
Novel roadway sprayed concrete heat insulation layer and application method thereof Download PDFInfo
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- CN112194416A CN112194416A CN202011025971.3A CN202011025971A CN112194416A CN 112194416 A CN112194416 A CN 112194416A CN 202011025971 A CN202011025971 A CN 202011025971A CN 112194416 A CN112194416 A CN 112194416A
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- insulation layer
- concrete
- heat insulation
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- cement
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
Abstract
The invention discloses a novel roadway sprayed concrete heat-insulating layer and a use method thereof, wherein the novel roadway sprayed concrete heat-insulating layer comprises a heat-insulating layer system, the heat-insulating layer comprises a heat-insulating layer raw material containing concrete, an expanded perlite material in the concrete accounts for 75-80 parts of the total weight of the concrete, and the concrete raw material accounts for the following ratio: the ceramsite in the stones accounts for 65-75 parts of the total weight of the stones; the cement, wherein the fly ash material in the cement accounts for 55-65 parts of the total weight of the cement, and the water reducing agent accounts for 1.0-1.5 parts of the total weight of the cement; the heat insulation layer system comprises a temperature sensor, a buzzer and a display screen. According to the invention, by designing the roadway heat insulation layer, after the roadway heat insulation layer is sprayed in the roadway, underground heat can be greatly isolated to the outer side of surrounding rocks, and heat generated at the inner side of the roadway is reduced.
Description
Technical Field
The invention relates to the field of underground coal mine temperature, in particular to a novel roadway sprayed concrete heat insulation layer and a using method thereof.
Background
Although the coal storage amount in China is large, because of huge coal consumption and high mining intensity every year, the shallow coal mine resources are gradually exhausted, the deep mining stage is gradually started, and the mining depth is increased year by year and is in a normalized trend. At present, the average mining depth of large and medium mining areas reaches 456m, the depths of east and north China reach 647m, the mining depth of the coal mine is gradually increased at a speed of 8-12 m every year, the temperatures of rock stratums are gradually increased at a speed of 10-25 m every year, and the temperatures of mining working faces of partial mines exceed 30 ℃. Deep mining can solve the energy problem, but causes the fifth coal mine disaster-mine thermal damage after gas, high ground stress, high water pressure and fire. The average temperature gradient of the coal mine is 0.035 ℃/m, namely, the temperature of the rock stratum can be increased by 0.035 ℃ every time one meter extends to the ground bottom, so that high-temperature rock stratum with the temperature of more than 35 ℃ can possibly appear around a deep well which is mined for kilometers, the temperature of a mine roadway can be increased, and the problem of thermal damage of the deep well can be more and more serious. The mine heat damage not only has serious influence on the mine production safety and the production efficiency, but also can cause the functional disorders of systems such as human body thermal regulation, central nervous system, digestion, metabolism and the like. The high temperature of the mine can easily cause serious mine safety accidents such as toxic heat waves, sulfur dust explosion, gas explosion and the like. The long-term high-temperature operation environment can not only endanger the physical and mental health of workers but also cause certain damage to underground construction electromechanical equipment, some mechanical equipment with over-high temperature can cause failure or even stop operation due to difficult heat dissipation, so that the construction progress is influenced, and relevant statistics show that the failure rate of underground construction mechanical equipment can be increased by at least more than 1 time when the temperature rises to 1 ℃.
It is expected that the situation of high temperature damage of the mine will become more severe with the gradual increase of the mining depth of the mine and the continuous improvement of the mechanization level. Therefore, the method solves the problem of mine thermal hazard and has important significance for green mine construction. The economic, efficient and practical mine cooling method and technology are researched and developed, the physical and mental health of the heat-damaged mine workers is guaranteed, and the necessary premise for realizing the safe development of deep mineral resources is provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a novel roadway sprayed concrete heat-insulating layer and a using method thereof.
In order to solve the above technical problem, the present invention provides a first technical solution as follows:
the invention relates to a novel roadway sprayed concrete heat insulation layer and a use method thereof, wherein the novel roadway sprayed concrete heat insulation layer comprises a heat insulation layer system, the heat insulation layer system comprises a heat insulation layer, the raw material of the heat insulation layer comprises concrete, expanded perlite materials in the concrete account for 75-80 parts of the total weight of the concrete, and the raw material of the concrete accounts for the following ratio:
the ceramsite in the stones accounts for 65-75 parts of the total weight of the stones;
the cement, wherein the fly ash material in the cement accounts for 55-65 parts of the total weight of the cement, and the water reducing agent accounts for 1.0-1.5 parts of the total weight of the cement;
the heat insulation layer system comprises a temperature sensor, a buzzer and a display screen.
As a preferred technical scheme of the invention, the temperature sensor is arranged on the surface of the heat insulation layer, the temperature sensor is respectively and electrically connected with the display screen and the buzzer, the temperature sensor is connected to an external power supply, and the display screen consists of an LED screen and a single chip microcomputer chip.
As a preferred technical scheme of the invention, the mixing amount of the expanded perlite is 85 percent of the total volume of the concrete unit, and the expanded perlite is used for enhancing the overall hydrophobicity of the heat insulation layer.
As a preferable technical scheme of the invention, the thickness of the heat insulation layer is 100 mm.
The invention provides a second technical scheme as follows:
the invention also provides a use method of the novel roadway sprayed concrete heat-insulating layer, which comprises the following steps:
a: preparing concrete, namely mixing cement, sand, water and stones according to the standard proportion of the concrete C15, wherein the mixing amount of ceramsite in the stones accounts for 70% of the total amount of the stones, other stones are fine stone materials, the mixing amount of fly ash in the cement accounts for 60% of the total amount of the cement, and the mixing amount of water reducer accounts for 1.2% of the total amount of the cement, so as to obtain the concrete;
b: c, stirring the concrete in the step A at a speed of 600r/min, and adding expanded perlite in the stirring process until the expanded perlite accounts for 80% of the total amount of the concrete to obtain the heat-insulating layer concrete;
c: c, spraying a heat insulation layer, namely spraying the heat insulation layer concrete in the step B to the surface of the surrounding rock of the roadway through a concrete shotcrete machine, wherein the spraying thickness is 100 mm;
d: c, embedding the prefabricated part, namely embedding a temperature sensor in the spraying process in the step C, wherein the contacts of the temperature sensor are respectively arranged on the surface of the surrounding rock and the surface of the heat insulation layer;
e: and installing early warning equipment, electrically connecting the display screen, the buzzer and the temperature sensor, and respectively installing the display screen, the buzzer and the temperature sensor to the surface of the heat insulation layer.
Compared with the prior art, the invention has the following beneficial effects:
1: according to the invention, by designing the roadway heat insulation layer, after the roadway heat insulation layer is sprayed in the roadway, underground heat can be greatly isolated to the outer side of surrounding rocks, and heat generated at the inner side of the roadway is reduced.
2: the early warning structure provided by the invention can perform early warning according to the temperature difference between the inner wall and the outer wall, when the temperature inside and outside the heat insulation layer is gradually close, the heat insulation layer loses the heat insulation effect gradually, and maintenance personnel can perform emergency treatment according to the condition of the heat insulation layer zone.
Detailed Description
The following is a description of the preferred embodiments of the present invention, and it should be understood that the preferred embodiments described herein are merely illustrative and explanatory of the invention, and are not restrictive thereof.
Example 1
The invention provides a novel roadway sprayed concrete heat insulation layer and a use method thereof, wherein the novel roadway sprayed concrete heat insulation layer comprises a heat insulation layer system, the heat insulation layer system comprises a heat insulation layer, the raw material of the heat insulation layer comprises concrete, the expanded perlite material in the concrete accounts for 75-80 parts of the total weight of the concrete, and the raw material proportion of the concrete is as follows:
the ceramsite in the stones accounts for 65-75 parts of the total weight of the stones;
the cement, wherein the fly ash material in the cement accounts for 55-65 parts of the total weight of the cement, and the water reducing agent accounts for 1.0-1.5 parts of the total weight of the cement;
the heat insulation layer system comprises a temperature sensor, a buzzer and a display screen.
Further, temperature sensor sets up in the thermal-insulated layer surface, and temperature sensor is electric connection with display screen and bee calling organ respectively, and temperature sensor is connected to external power supply, and the display screen comprises LED screen and monolithic chip.
The mixing amount of the expanded perlite is 85 percent of the unit total volume of the concrete, and the expanded perlite is used for enhancing the integral hydrophobicity of the heat-insulating layer.
The thickness of the heat insulation layer is 100 mm.
The invention provides a use method of a novel roadway sprayed concrete thermal insulation layer, which comprises the following specific steps:
a: preparing concrete, namely mixing cement, sand, water and stones according to the standard proportion of the concrete C15, wherein the mixing amount of ceramsite in the stones accounts for 70% of the total amount of the stones, other stones are fine stone materials, the mixing amount of fly ash in the cement accounts for 60% of the total amount of the cement, and the mixing amount of water reducer accounts for 1.2% of the total amount of the cement, so as to obtain the concrete;
b: c, stirring the concrete in the step A at a speed of 600r/min, and adding expanded perlite in the stirring process until the expanded perlite accounts for 80% of the total amount of the concrete to obtain the heat-insulating layer concrete;
c: c, spraying a heat insulation layer, namely spraying the heat insulation layer concrete in the step B to the surface of the surrounding rock of the roadway through a concrete shotcrete machine, wherein the spraying thickness is 100 mm;
d: c, embedding the prefabricated part, namely embedding a temperature sensor in the spraying process in the step C, wherein the contacts of the temperature sensor are respectively arranged on the surface of the surrounding rock and the surface of the heat insulation layer;
e: and installing early warning equipment, electrically connecting the display screen, the buzzer and the temperature sensor, and respectively installing the display screen, the buzzer and the temperature sensor to the surface of the heat insulation layer.
Specifically, the current roadway cooling measures at home and abroad are generally divided into 'active cooling' and 'passive cooling', the 'passive cooling' mainly takes artificial refrigeration, such as mechanical refrigeration, as well as 'active cooling' which mainly takes control of high-temperature gas discharged into a roadway, so that the cooling purpose is realized, such as dredging and heat insulation, but the passive cooling requires a large amount of mechanical equipment, and therefore, the cost is huge and the operation is complex. In addition, when the machine works under a high-speed running state for a long time, a large amount of heat is released, and the temperature in the mine is increased. Most importantly, passive cooling does not solve the problem of heat dissipation of surrounding rocks from the source, and the surrounding rocks can only be cooled continuously, but the heat insulation layer designed in the invention mainly adopts a passive cooling mode, the effect of blocking a heat source can be realized by spraying the heat insulation layer on the surrounding rocks, and the mode is more economical compared with active cooling.
The main material of the thermal insulation layer is concrete, ceramsite and fly ash are mainly added into the raw materials of the concrete, the two materials have strong thermal insulation effects, after the ceramsite and the fly ash are added into the raw materials of the concrete in proportion, the concrete capable of reducing the roadway temperature in a large amount can be obtained by stirring according to the proportion of C15, the hydrophobicity of the thermal insulation concrete can be increased by adding a large amount of expanded perlite in the stirring process, the formed thickness of the concrete after spraying and solidification can not be lost due to water in the roadway, and the service life of the whole thermal insulation layer is prolonged.
The heat insulation calculation formula of the manufactured heat insulation layer is as follows: q ═ KF (T)1-T2)；
Q is the thickness of the concrete heat insulation layer, K is the heat conductivity coefficient of the concrete heat insulation layer, F is the surface area of the roadway to be provided with the heat insulation layer, and T is1Temperature in the tunnel, T2Ideal temperature in the tunnel, thermal conductivity of less than 0.2W/(m.DEG C) measured at the actually produced insulation layer, Q having a thickness of 0.1m, and F having a unit area of 1m, as explained above2Computing, heat transfer systemThe number is calculated as 0.2, 1m per unit area2The temperature difference is 0.5 ℃, so the temperature difference between the inside and the outside generated after a large amount of heat insulation layers are used is large, the temperature in the roadway can be continuously reduced to the ideal temperature, and the actual formed cooling effect can be achieved.
After using the insulating layer, the early warning structure of installing also can combine the insulating layer to use in the lump, and the contact of temperature sensor is the response difference in temperature inside and outside the insulating layer, and then explain when the difference in temperature is close gradually that the insulating layer is losing the effect, and the thermal-insulated effect of this scope department is reducing, and maintainer then can be according to the induction temperature that shows on the display screen, look for the region that thermal-insulated became invalid through bee calling organ, through examining and repairing and maintaining its loss position, makes its thermal-insulated effect resume normally.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (5)
1. The novel roadway sprayed concrete heat insulation layer comprises a heat insulation layer system, wherein the heat insulation layer system comprises a heat insulation layer, the raw material of the heat insulation layer comprises concrete, expanded perlite material in the concrete accounts for 75-80 parts of the total weight of the concrete, and the raw material of the concrete accounts for the following ratio:
the ceramsite in the stones accounts for 65-75 parts of the total weight of the stones;
the cement, wherein the fly ash material in the cement accounts for 55-65 parts of the total weight of the cement, and the water reducing agent accounts for 1.0-1.5 parts of the total weight of the cement;
the heat insulation layer system comprises a temperature sensor, a buzzer and a display screen.
2. The novel roadway shotcrete thermal insulation layer and the use method thereof as claimed in claim 1, wherein the temperature sensor is arranged on the surface of the thermal insulation layer, the temperature sensor is electrically connected with the display screen and the buzzer respectively, the temperature sensor is connected to an external power supply, and the display screen is composed of an LED screen and a single chip microcomputer chip.
3. The novel roadway shotcrete thermal insulation layer and the use method thereof as claimed in claim 1, wherein the amount of the expanded perlite added is 85% of the total volume of the concrete unit, and is used for enhancing the overall hydrophobicity of the thermal insulation layer.
4. The novel roadway shotcrete insulation layer and the use method thereof as claimed in claim 1, wherein the thickness of the insulation layer is 100 mm.
5. A use method of a novel roadway sprayed concrete heat insulation layer is characterized by comprising the following specific steps:
a: preparing concrete, namely mixing cement, sand, water and stones according to the standard proportion of the concrete C15, wherein the mixing amount of ceramsite in the stones accounts for 70% of the total amount of the stones, other stones are fine stone materials, the mixing amount of fly ash in the cement accounts for 60% of the total amount of the cement, and the mixing amount of water reducer accounts for 1.2% of the total amount of the cement, so as to obtain the concrete;
b: c, stirring the concrete in the step A at a speed of 600r/min, and doping the expanded perlite in the stirring process until the expanded perlite accounts for 80% of the total weight of the concrete to obtain the concrete of the heat insulation layer;
c: c, spraying a heat insulation layer, namely spraying the heat insulation layer concrete in the step B to the surface of the surrounding rock of the roadway through a concrete shotcrete machine, wherein the spraying thickness is 100 mm;
d: c, embedding the prefabricated part, namely embedding a temperature sensor in the spraying process in the step C, wherein the contacts of the temperature sensor are respectively arranged on the surface of the surrounding rock and the surface of the heat insulation layer;
e: and installing early warning equipment, wherein the display screen, the buzzer and the temperature sensor are electrically connected and are respectively installed on the surface of the heat insulation layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011025971.3A CN112194416A (en) | 2020-09-25 | 2020-09-25 | Novel roadway sprayed concrete heat insulation layer and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011025971.3A CN112194416A (en) | 2020-09-25 | 2020-09-25 | Novel roadway sprayed concrete heat insulation layer and application method thereof |
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| CN112194416A true CN112194416A (en) | 2021-01-08 |
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2020
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Application publication date: 20210108 |