CN111271117A - Polymer foaming material for coal mine airtight filling - Google Patents
Polymer foaming material for coal mine airtight filling Download PDFInfo
- Publication number
- CN111271117A CN111271117A CN201910376857.6A CN201910376857A CN111271117A CN 111271117 A CN111271117 A CN 111271117A CN 201910376857 A CN201910376857 A CN 201910376857A CN 111271117 A CN111271117 A CN 111271117A
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- component
- coal mine
- filling
- coal
- grouting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/08—Filling-up hydraulically or pneumatically
Abstract
The invention relates to the technical field of coal mine filling, in particular to a high polymer foaming material for coal mine closed filling, which can be used for closed filling of a coal mine high-head area, reducing fire accidents and improving coal mine mining safety; the composite material is formed by mixing a component A and a component B, wherein the component A comprises an additive, a combined polyol, resin and an ether high molecular compound, the component B comprises a catalyst, the additive comprises a reinforcing agent, an expanding agent, a flame retardant, a stabilizer and a diluent, and the component A and the component B are injected into a filling space through a special pneumatic injection pump and a mixing gun to break a coal rock mass and then quickly undergo a chemical reaction, and are cemented and solidified with the coal rock mass to generate a high-strength expansion consolidated body, so that the purposes of filling, reinforcing or blocking can be achieved.
Description
Technical Field
The invention relates to the technical field of coal mine filling, in particular to a high-molecular foaming material for coal mine closed filling.
Background
China is one of the most abundant countries of coal resources in the world, China has thousands of years of history of utilizing coal, and is one of the earliest countries of finding and utilizing coal in the world, coal mines are areas where people mine coal resources in coal-rich mining areas and are generally divided into underground coal mines and open coal mines, and when a coal seam is far away from the ground surface, a roadway is generally selected to be excavated to the underground to mine the coal mines; when the coal bed is very close to the earth surface, the coal is generally excavated by directly stripping the earth surface soil layer, namely an open pit coal mine; the vast majority of coal mines in China belong to underground coal mines, and the coal mine range comprises a large area of underground and overground and related facilities.
One of the tunnel arrangement characteristics of the fully mechanized caving mining technology is that the air inlet tunnel and the air return tunnel of the working face are arranged along the bottom plate of the coal bed, the peripheries of the tunnels except the bottom plate are all coal beds, and due to the existence of geological change and geological structure, a high caving area is often formed due to local thickening of the coal beds. The coal body in a broken state in the high-emission area has a proper air leakage oxygen supply channel and a heat storage environment, and natural ignition is easily caused.
Along with the continuous increase of the coal mining scale and the mining depth in China, coal mine safety production and mine disaster control are more and more concerned, so that how to improve the stability of coal bodies in a high-risk area and reduce coal mine fire accidents in the coal mining process is a problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention provides the polymer foaming material for coal mine closed filling, which can be used for closed filling of a coal mine high-risk area, reduce fire accidents and improve coal mining safety.
The invention relates to a high polymer foaming material for coal mine closed filling, which is formed by mixing a component A and a component B, wherein the component A comprises an additive, a combined polyol, resin and an ether high polymer compound, the component B comprises a catalyst, and the additive comprises a reinforcing agent, an expanding agent, a flame retardant, a stabilizer and a diluent.
The polymer foaming material for coal mine closed filling is characterized in that the Gardner color number of the component A is 10, and the Gardner color number of the component B is 6.
The invention relates to a high polymer foaming material for coal mine closed filling, which comprises the following raw materials in parts by weight:
1-2 parts of an additive;
19-21 parts of combined polyol;
10-16 parts of resin;
16-19 parts of ether high molecular compound;
the polymer foaming material for coal mine closed filling comprises a reinforcing agent, an expanding agent, a flame retardant, a stabilizer and a diluent which are mixed in a ratio of 3:4:1:2: 1.
The high polymer foaming material for coal mine closed filling provided by the invention has the moisture content of less than or equal to 0.50% in the component A.
The high polymer foaming material for coal mine closed filling is characterized in that the mixing ratio of the component A to the component B is 1:1 when the high polymer foaming material is used.
The invention relates to a high polymer foaming material for closed filling of a coal mine, which is characterized in that a component A and a component B need to be mixed at present when in use, and the component A needs to be stirred and mixed uniformly when in use.
The invention discloses a high polymer foaming material for coal mine closed filling, which comprises the following steps in use:
(1) moving the component A, the component B and a pneumatic pump to the underground of the coal mine;
(2) preparing a construction site and preparing construction equipment;
(3) preparing an air source, water and a cleaning agent, and simultaneously checking the states of a high-pressure pipe, a pneumatic pump and a mixer;
(4) punching a part to be filled, connecting equipment and flushing the equipment;
(5) grouting and sealing holes;
(6) hole-changing grouting, flushing pipelines and mixers;
(7) after filling, cleaning the pneumatic pump and the mixer by using a cleaning agent;
(8) and after the construction is finished, closing the air source and cleaning the site.
Compared with the prior art, the invention has the beneficial effects that: the component A and the component B are injected into a filling space through a special pneumatic grouting pump and a mixing gun to break a coal rock body, then the chemical reaction is rapidly carried out, the components are cemented and cured with the coal rock body to generate a high-strength expansion cured body, the initial setting time is 10-60 s, the final setting time is 60-240 s, and the setting speed is high, so that the consumed time is short, the volume expansion multiple of the high-strength expansion cured body in the cementing and curing process is 2-15 times, the compressive strength of the high-strength expansion cured body is more than or equal to 0.3Mpa and more than or equal to 0.8Mpa after the cementing and curing are finished, and the purposes of filling, reinforcing or plugging can be achieved The novel organic polymer double-liquid type grouting material for coal mine reinforced coal rock is prepared according to the existing principle when in use, and has high preservation performance and high cementing and curing effects.
Drawings
FIG. 1 is a flow chart of the construction process of the present invention in use;
FIG. 2 is a schematic view of roadway wall back filling;
FIG. 3 is a schematic filling diagram of a tunnel top-hat region;
FIG. 4 is a schematic view of the enclosed filling of the air intake and return corners and the enclosure walls;
FIG. 5 is a schematic view of coal consolidation;
FIG. 6 is a schematic diagram of the advanced coal roadway reinforcement and face coal wall reinforcement process.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
And (2) component A: 1-2 parts of an additive; 19-21 parts of combined polyol; 10-16 parts of resin; 16-19 parts of ether high molecular compound; wherein the additive comprises a reinforcing agent with the ratio of 3:4:1:2:1, an expanding agent, a flame retardant, a stabilizer and a diluent;
the component A has a Gardner color number of 10, a water content of less than or equal to 0.50%, a viscosity of 260-280 mPa.s measured at 25 ℃, an unsaturation degree of 0.02mol/kg, a pH value of 5.5-7.5, and a density of 1100-1200 kg/m3，
And (B) component: a catalyst;
the component B has a Gardner color number of 6, a viscosity of 90-150 mPa.s measured at 25 ℃, an unsaturation degree of 0.02mol/kg, a pH value of 4.0-6.0, and a density of 1200-1300 kg/m3，
(1) Moving the component A, the component B and the QB type pneumatic grouting pump to the underground of the coal mine;
(2) preparing a construction site and construction equipment, arranging the site, fixing auxiliary articles, and preparing two open iron pipes as a slurry suction barrel;
(3) preparing a power compressed air source, wherein the air supply quantity is required to be more than or equal to 3m3Min, the air supply pressure is more than or equal to 0.5Mpa, the air source delivery requires a high-pressure steel wire rubber pipe with the drift diameter of phi 25, the length depends on the air source to the construction site, water and two barrels of special cleaning agents are used, and the states of a high-pressure pipe, a pneumatic pump and a mixer are checked at the same time;
(4) punching a part to be filled, installing a pneumatic pump and a pulp suction pipe and a pulp discharge pipe thereof, and flushing equipment;
(5) pouring the component A and the component B into two groups of slurry suction barrels respectively, wherein the component A must be fully stirred uniformly, putting slurry suction pipes into the slurry suction barrels respectively, controlling the component A by a slurry discharge pressure gauge, and starting a pneumatic pump to press 1:1, mixing the component A and the component B through a slurry discharge pipe, a one-way check valve, a three-way mixer, a grouting pipe and the like, and injecting the mixture into a specified space or a rock stratum (coal seam) crack;
(6) hole changing and grouting, and flushing pipelines and a mixer with water;
(7) after filling, cleaning the pneumatic pump and the mixer by using a special cleaning agent;
(8) and after the construction is finished, closing the air source and cleaning the site.
The polymer foam material for sealing and filling the coal mine is mainly applied to the underground coal mine, such as roadway wall back filling, high-rise area filling, sealing of air inlet and air return corners, coal body reinforcement of sealing walls, roadway coal wall ledges and triangular areas and the like.
Example 1
Filling behind tunnel wall
The roadway wall is filled with the filler as shown in figure 2;
and (3) roadway wall back filling notice:
① the drilling parameters are determined by the section condition of the tunnel, the aperture phi is 28-phi 45mm, the hole depth is suitable for penetrating the tunnel wall;
② the amount of grouting is determined by the size of the space behind the wall;
③ the hole changing or grouting stop is determined by the grouting pressure, namely the working pressure of the QB pneumatic pump and the seepage of raw materials, and the hole changing or grouting stop is determined when the grouting pressure rises to about 5MPa or the grouting amount is almost the same as the seepage amount.
Example 2
Filling of high-risk areas
The tunnel high-caving area is filled as shown in figure 3;
filling cautions of the tunnel high-risk area:
① construction materials and equipment should be placed in region I;
② the auxiliary materials such as wire netting, bamboo basketry, and air duct cloth should be firmly fixed on the periphery and well contacted to prevent large gap from being formed between the auxiliary materials and the periphery;
③ when the area of the auxiliary material is larger (larger than 3 m)2) Steel belts or suspended objects such as iron wires and anchor cables should be added under the auxiliary objects such as iron wire nets or bamboo fences to improve the bearing capacity;
④ when constructing, the constructor should stay in the I area and II area as much as possible, avoid staying in the III area for a long time, and avoid staying in the IV area as much as possible (determined according to the wind direction);
⑤ should be constructed from No. ③ to No. ①;
⑥ the material usage should be estimated in advance before construction, and when the filling usage approaches the estimated material usage and the QB type pneumatic pump stops, it indicates that the empty space is full.
Example 3
Sealing of air inlet and return corners and sealing walls
The enclosed filling of the air inlet and return corners and the enclosure walls is shown in fig. 4;
close-fill notes:
① the auxiliary material such as iron wire or bamboo fence should be firmly fixed on the periphery and well contacted to prevent large gap from being formed between the periphery and the auxiliary material;
② hanging double layers of iron wire netting or bamboo fence with a time interval of 200-500 mm;
③ when the area of the auxiliary material is larger (larger than 3 m)2) The steel belt should be added on the auxiliary objects such as iron wire net or bamboo basketry to improve the bearing capacity;
④ in order to increase the bonding performance of the floating horse in the peripheral area when filling, the foaming ratio of the floating horse should be reduced;
⑤ when used as a sealing wall, the periphery of the wall is required to be cut into grooves, and the depth of the grooves is 50-200 mm;
⑥ after filling, the brush is used to sweep and spray around the wire netting or bamboo fence to enhance the contact with the periphery.
Example 4
Coal body reinforcement of tunnel coal wall rib and triangular area
The coal body is reinforced as shown in figure 5;
coal body strengthening precautions:
① drilling parameters are determined by site geological conditions, the aperture phi is 28-45 mm, the hole depth is 1-6 m, and the elevation angle is 15-45 degrees;
② determining the hole distribution parameters according to the field conditions when the holes are distributed as indicated by black lines;
③ the grouting amount is determined by the hole depth and the amount of the crack penetrated by the drill hole, and the grouting amount is increased correspondingly as the drill hole penetrates the crack deeper;
④ the hole replacement or grouting stop is determined by both grouting pressure and material seepage, and the hole replacement or grouting stop should be determined when grouting pressure rises to about 15MPa or grouting amount is almost the same as seepage amount.
Example 5
Advanced reinforcement of coal roadway and reinforcement of coal wall of working face
The advance reinforcing process of the coal roadway and the reinforcing process of the coal wall of the working face are shown in FIG. 6;
advanced reinforcement considerations:
① the drilling parameters are determined by the field conditions;
② grouting amount is determined by coal seam fracture condition and hole distribution parameters;
③ paying attention to the opening force of the closed fracture of the coal seam, and when the grouting pressure reaches the value, changing the hole or stopping grouting according to the situation on site;
④ when arranging holes, the cloth holes at shoulder should be noticed, and the cloth holes can prevent or reduce the occurrence of rib stripping.
In order to ensure the construction quality of chemical grouting and the safety of construction operation, the operation rules of the special design are made. Any person involved in grouting must be familiar with the protocol and ensure strict adherence during actual work:
1) protective articles such as protective glasses, masks, rubber gloves and the like must be worn by grouting personnel during construction;
2) before construction, the construction site needs to knock the top, and after removing floating gangue dangerous rocks at the top and the side, drilling and grouting construction are carried out. When drilling holes at a high place and installing a grouting pipe, a stable and firm workbench needs to be built, an underground support needs to be firm, and people need to observe the underground support;
3) the grouting pipe cannot be looked at right angles when operated, and a grouting valve must be opened after the pulse pressure in the grouting pipe is released;
4) people irrelevant to grouting and observers in front of grouting need to observe remotely outside a grouting reinforcement area by 10m, wear corresponding protective articles and contact with pumping personnel at any time;
5) a pumpersee must strictly observe the pump pressure all the time, pay attention to the pump condition and contact with a front observer at any time, and once abnormal conditions such as coal wall looseness, slurry leakage (slurry leakage) and sudden drop of grouting pressure are discovered, grouting should be stopped immediately, reasons are found out, and grouting construction is allowed to be recovered after measures are taken;
6) slurry preparation personnel should keep the slurry not to suck empty, observe the slurry sucking condition of the pump at any time and keep the mixture ratio of the two slurries to be moderate;
7) non-professional personnel cannot operate a grouting pump and a pulping machine so as to avoid accidents;
8) a certain amount of cleaning water is required to be provided in a working place, if serous fluid is carelessly splashed into skin or eyes, a large amount of clear water is required to be used for washing immediately, a serious person needs to seek medical treatment immediately, and a human body cannot contact with a chemical grouting material;
9) when the operations such as drilling, pipe burying, hole sealing, pipe connection and the like are carried out, the safety condition around the operation, particularly the maintenance condition of a head-on top plate, is required to be checked in advance, and the operation against the regulations cannot be carried out;
10) the connecting piece at the high-pressure end of the whole grouting system must be firmly connected by a regular connecting pin;
11) after grouting, cleaning the pipelines with clear water or engine oil immediately, and arranging the pumps, the pipelines and the like in order;
12) various materials which are easy to be affected with moisture need to have waterproof and moistureproof measures;
13) during grouting operation, the system needs to avoid or cover obstacles such as pipelines;
14) the pipeline hanging and material stacking on the construction site are orderly and orderly, and the cleaning is clean, so that the civilized production is well realized;
15) when other operations are carried out on site, grouting personnel need to stop operating, hide in a safety zone, and carry out construction after safety;
16) any person participating in grouting must be familiar with the operation regulations and operation regulation requirements related to the reinforced site, familiar with disaster avoidance routes and guaranteed to strictly comply with the actual work;
17) and (4) executing according to related terms of coal mine safety regulations, related operation regulations of mine prescription and operation regulations to the extent of inexhaustibility.
The component A and the component B are injected into a filling space through a special pneumatic grouting pump and a mixing gun to break a coal rock body, then the chemical reaction is rapidly carried out, the components are cemented and cured with the coal rock body to generate a high-strength expansion cured body, the initial setting time is 10-60 s, the final setting time is 60-240 s, and the setting speed is high, so that the consumed time is short, the volume expansion multiple of the high-strength expansion cured body in the cementing and curing process is 2-15 times, the compressive strength of the high-strength expansion cured body is more than or equal to 0.3Mpa and more than or equal to 0.8Mpa after the cementing and curing are finished, and the purposes of filling, reinforcing or plugging can be achieved The novel organic polymer double-liquid type grouting material for coal mine reinforced coal rock is prepared according to the existing principle when in use, and has high preservation performance and high cementing and curing effects.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The high-molecular foaming material for the closed filling of the coal mine is characterized by being formed by mixing a component A and a component B, wherein the component A comprises an additive, a combined polyol, resin and an ether high-molecular compound, the component B comprises a catalyst, and the additive comprises a reinforcing agent, an expanding agent, a flame retardant, a stabilizer and a diluent.
2. The polymer foam material for coal mine close-packing according to claim 1, wherein the Gardner color number of the component A is 10, and the Gardner color number of the component B is 6.
3. The polymer foam material for coal mine closed filling according to claim 1, wherein the component A comprises the following raw materials in parts by weight:
1-2 parts of an additive;
19-21 parts of combined polyol;
10-16 parts of resin;
16-19 parts of ether high molecular compound.
4. The polymer foam material for coal mine close filling as claimed in claim 1, wherein the additive comprises a reinforcing agent, an expanding agent, a flame retardant, a stabilizer and a diluent which are mixed in a ratio of 3:4:1:2: 1.
5. The polymer foam material for coal mine closed filling as claimed in claim 1, wherein the moisture content in the component A is less than or equal to 0.50%.
6. The polymer foam material for coal mine close-filling according to claim 1, wherein the mixing ratio of the component A to the component B in use is 1: 1.
7. The polymer foam material for coal mine close-filling according to claim 1, wherein the component A and the component B are mixed at present when in use, and the component A is firstly stirred and mixed uniformly when in use.
8. The polymer foam material for coal mine close filling according to claim 1, which comprises the following steps in use:
(1) moving the component A, the component B and a pneumatic pump to the underground of the coal mine;
(2) preparing a construction site and preparing construction equipment;
(3) preparing an air source, water and a cleaning agent, and simultaneously checking the states of a high-pressure pipe, a pneumatic pump and a mixer;
(4) punching a part to be filled, connecting equipment and flushing the equipment;
(5) grouting and sealing holes;
(6) hole-changing grouting, flushing pipelines and mixers;
(7) after filling, cleaning the pneumatic pump and the mixer by using a cleaning agent;
(8) and after the construction is finished, closing the air source and cleaning the site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910376857.6A CN111271117A (en) | 2019-05-03 | 2019-05-03 | Polymer foaming material for coal mine airtight filling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910376857.6A CN111271117A (en) | 2019-05-03 | 2019-05-03 | Polymer foaming material for coal mine airtight filling |
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Cited By (2)
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| CN112832767A (en) * | 2021-01-05 | 2021-05-25 | 河南理工大学 | Coal seam roof reinforcing apparatus based on high pressure gas-solid mixture is filled |
| CN113818879A (en) * | 2021-08-09 | 2021-12-21 | 华北科技学院(中国煤矿安全技术培训中心) | Broken coal pillar reinforcing and fire preventing method |
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| CN112832767A (en) * | 2021-01-05 | 2021-05-25 | 河南理工大学 | Coal seam roof reinforcing apparatus based on high pressure gas-solid mixture is filled |
| CN113818879A (en) * | 2021-08-09 | 2021-12-21 | 华北科技学院(中国煤矿安全技术培训中心) | Broken coal pillar reinforcing and fire preventing method |
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