CN108033747B - Antirust tensile cement slurry and spraying method - Google Patents
Antirust tensile cement slurry and spraying method Download PDFInfo
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- CN108033747B CN108033747B CN201711169805.9A CN201711169805A CN108033747B CN 108033747 B CN108033747 B CN 108033747B CN 201711169805 A CN201711169805 A CN 201711169805A CN 108033747 B CN108033747 B CN 108033747B
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- 239000004568 cement Substances 0.000 title claims abstract description 127
- 239000002002 slurry Substances 0.000 title claims abstract description 100
- 238000005507 spraying Methods 0.000 title claims abstract description 43
- 238000007613 slurry method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000003245 coal Substances 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 8
- 238000009412 basement excavation Methods 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000006253 efflorescence Methods 0.000 claims abstract description 6
- 230000002265 prevention Effects 0.000 claims abstract description 6
- 206010037844 rash Diseases 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 239000007921 spray Substances 0.000 claims description 13
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000001502 supplementing effect Effects 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 9
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 claims description 6
- 239000011440 grout Substances 0.000 claims description 5
- 150000001412 amines Chemical class 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- -1 alcohol fatty acid ester compound Chemical class 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 16
- 239000000843 powder Substances 0.000 abstract description 14
- 239000004372 Polyvinyl alcohol Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 9
- 239000003795 chemical substances by application Substances 0.000 abstract description 8
- 239000004816 latex Substances 0.000 abstract description 8
- 229920000126 latex Polymers 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 239000010881 fly ash Substances 0.000 abstract description 7
- 239000013556 antirust agent Substances 0.000 abstract description 5
- 229910052602 gypsum Inorganic materials 0.000 abstract description 5
- 239000010440 gypsum Substances 0.000 abstract description 5
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 abstract description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 abstract description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 abstract description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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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
- C04B28/14—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 containing calcium sulfate cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Architecture (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses an antirust tensile cement slurry for preventing tunnel efflorescence and rust prevention of a metal mesh and an anchor rod during coal mine tunnel excavation and a spraying method, wherein the antirust tensile cement slurry comprises the following components in percentage by weight: 0.3 to 0.5 percent of defoaming agent, 0.3 to 0.5 percent of hydroxypropyl methyl cellulose HPMC20 water-retaining agent, 4.2 to 5 percent of polyvinyl alcohol PVA1788, 3.5 to 4.0 percent of redispersible latex powder, 12 to 15 percent of high-strength model gypsum powder, 45 to 47 percent of first-grade fly ash, 0.7 to 0.9 percent of antirust agent and the balance of cement; the total content of the substances is 100 percent; and the water cement ratio when preparing the cement slurry is as follows: 0.6 to 0.68. Under the condition of not changing the existing coal mine construction technology, method and large process, the problems of low tunnel guniting construction efficiency and serious material waste are solved, the shaping anticorrosion spraying is realized, and the antirust tensile effect is improved.
Description
Technical Field
The invention relates to cement grout, in particular to antirust tensile cement grout for preventing tunnel weathering and preventing rust prevention of a metal mesh and an anchor rod during coal mine tunnel excavation and a spraying method.
Background
Because the excavation is continuous and tense, the spraying speed of the tunnel cannot meet the requirement of quick excavation, the traditional spraying process is complex, the spraying speed is slow, the requirement of the spraying material is large, great pressure is caused to the underground auxiliary transportation link, and the high-efficiency production of the mine is severely restricted.
If all the mine shafts, mining areas or prepared roadways are subjected to guniting construction, the tunneling footage must be reduced, the production continuity of the mine shafts is seriously influenced, and the material cost and the labor cost are greatly increased. And the roadway without guniting is increased along with the service life, the phenomena of severe surface weathering and corrosion of the anchor rod and the metal mesh occur in the roadway, and the stability of the roadway is seriously influenced.
The traditional guniting construction method comprises the steps of sprinkling, mixing and guniting (primary spraying), sprinkling and maintaining, and re-spraying, wherein the guniting materials comprise cement, medium sand and an accelerating agent, the guniting thickness is not less than 100mm, the rebound rate is generally more than 30%, the construction speed is low, 5-6 persons are required to operate simultaneously to construct, a grout layer is easy to crack after being pressed for a long time, and the grout layer is not easy to maintain.
In the process of underground guniting, as the pipeline for conveying the uniformly stirred cement paste to the spraying equipment is too long, part of the cement paste can be solidified into blocks in the conveying process, the spraying equipment is easy to block, and even the spraying equipment is damaged.
Accordingly, the prior art is left to be improved and developed.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a rust-proof tensile cement slurry and a spraying method thereof, which can improve the rust-proof tensile effect and improve the uniformity of the cement slurry during spraying.
In order to solve the technical problem, the scheme of the invention comprises the following steps:
the rust-proof tensile cement slurry for preventing tunnel efflorescence and preventing metal mesh and anchor rod rust during coal mine tunnel excavation comprises the following components in percentage by weight:
the total content of the substances is 100 percent;
the cement slurry is prepared by the following steps: 0.6 to 0.68.
The antirust tensile cement slurry is characterized in that the cement is 525 cement.
The antirust tensile cement slurry is characterized in that the defoaming agent is one of a high-carbon alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether or polyoxyethylene polyoxypropylene amine ether.
The spraying method of the antirust tensile cement slurry comprises the following steps:
preparing antirust tensile cement slurry from the substances according to a proportion, introducing the antirust tensile cement slurry into a cement slurry high-pressure tank, enabling the cement slurry to enter a feeding mechanism of the cement slurry high-pressure tank through a corresponding pipeline, enabling the cement slurry to quickly impact a first conical stopper under the action of a first injection port, continuously quickly impact a second conical stopper under the action of a second injection port after the cement slurry is scattered by the first conical stopper, continuously quickly impact the third conical stopper under the action of a third injection port after the cement slurry is scattered by the second conical stopper, and thoroughly crushing hard blocks in the cement slurry and enabling the hard blocks to naturally fall into the cement slurry high-pressure tank after the third conical stopper;
synchronously pressurizing the cement slurry high-pressure tank through the first jet orifice, the second jet orifice and the third jet orifice, and sealing the feeding port after the cement slurry is transmitted; if the pressure in the cement paste high-pressure tank is lower than the preset value, enabling the pressure in the cement paste high-pressure tank to reach the preset value through a pressure supplementing air inlet; then, opening a spray gun to spray out the cement slurry in the cement slurry high-pressure tank;
and uniformly spraying the antirust tensile cement slurry to the surfaces of the roadway, the metal net and the anchor rod plate, wherein the coverage thickness is 1 mm.
The spraying method comprises the steps that the cement paste high-pressure tank comprises a tank body, a feeding port is arranged at the upper part of the tank body, a feeding mechanism is arranged at the feeding port, the feeding port mechanism comprises a feeding cylinder with an air inlet cavity, the feeding cylinder is vertically arranged, a first conical stopper, a second conical stopper and a third conical stopper are sequentially arranged in the feeding cylinder from top to bottom, the coverage area of the first conical stopper, the coverage area of the second conical stopper and the coverage area of the third conical stopper are sequentially reduced, a first jet orifice is arranged at the position, corresponding to the upper end of the first conical stopper, of the feeding cylinder, a second jet orifice is arranged at the position, corresponding to the upper end of the second conical stopper, a third jet orifice and a first jet orifice are arranged at the position, corresponding to the upper end of the third conical stopper, the second injection port and the third injection port are communicated with the air inlet cavity, and the injection ports are matched with the corresponding conical stoppers to break up cement slurry.
The spraying method is characterized in that the included angles between the air flow sprayed by the first spray opening, the second spray opening and the third spray opening and the vertical line are 30-40 degrees.
The spraying method is characterized in that a pressure supplementing air inlet is formed in one side of the tank body, an unloading valve is arranged in one side of the pressure supplementing air inlet, and the unloading pressure of the unloading valve is 0.8 MPa.
The spraying method is characterized in that a slurry outlet pipe is arranged on one side of the tank body and communicated with a spray gun.
The invention provides antirust tensile cement slurry for preventing tunnel efflorescence and rust prevention of a metal net and an anchor rod during coal mine tunnel excavation and a spraying method, which realize shaping anticorrosion spraying by solving the problems of low tunnel guniting construction efficiency and serious material waste under the condition of not changing the existing coal mine construction technology, method and large process; the construction method for spraying the antirust tensile cement paste is material mixing and spraying, the process is simple, re-spraying and water spraying maintenance are not needed, the spraying thickness is 1mm, the rebound rate is not more than 10%, the operation can be completed by only 2-3 persons generally, and the construction efficiency is high; the material consumption is less in the actual construction process on site, the mine transportation pressure can be greatly relieved, the spraying equipment is simple and portable, the operation can be carried out by only 2 persons, the construction is simple, the engineering quantity is small, the construction efficiency is high, and the working efficiency is 10 times of the traditional slurry spraying working efficiency; the construction process is simple, re-spraying and maintenance are not needed, the weathering prevention and corrosion prevention effects are obvious, and the potential hazard of tunnel overhaul caused by corrosion can be effectively reduced; the spraying construction has low rebound rate, high material utilization rate, wide raw material source, low cost and low requirement on the operation technology of workers, and is suitable for large-scale popularization and application. The specific mechanism is as follows:
the cement serving as a main material is solidified and then attached to the surfaces of the coal rock layer, the metal mesh and the anchor rod disc, so that the effects of preventing the coal rock layer of the roadway from being weathered and solidifying are achieved; the defoaming agent eliminates air bubbles in the cement slurry, increases the compactness of the slurry, plays a role in isolating air after curing, and the water retaining agent can lock moisture, prevent the cracking of a slurry layer caused by the rapid dehydration of cement, and the polyvinyl alcohol increases the pumpability of the cement slurry, thereby improving the strength of a mixture.
The tensile strain capacity and the bending toughness of the cement slurry can be obviously improved by adding a small amount of redispersible latex powder, and the tensile strain performance of the cement slurry after curing reaches the highest when the addition amount is 4.5 percent; the redispersible polymer rubber powder and the cement slurry are mixed to generate a stable dispersion system, and polymer particles are self-dispersed and do not cohere with cement, so that hydrophilic polyvinyl alcohol is added to serve as a protective carrier, the polyvinyl alcohol can fully combine redispersible latex powder polymer particles with the cement particles, the optimal effect is achieved when the mixing amount is 3.8%, the performance of the redispersible latex powder can be further expanded, the redispersible latex powder can be used as a thixotropic agent to improve the anti-sagging performance of the slurry, the fly ash can replace the cement to reduce the using amount of the cement, and the fly ash can be filled between polymer macromolecular structures due to the advantages of small fineness and small pores of the fly ash, so that the compactness of the cement slurry is improved, and the waterproof and air-insulating effects are achieved; the gypsum powder is added to slow down the setting time of the cement paste, so that the cement paste is uniformly covered, and the construction convenience is improved; the water retention agent increases the water retention capacity of the slurry, fully exerts the hydration effect of the cement, and improves the consistency of the slurry and the cross-linking structural strength among polymer molecules; after the antirust agent is mixed into the cement slurry and cured, a layer of compact film is formed between the solidification body and the metal material, and the antirust effect of water resistance and air isolation is achieved.
Drawings
FIG. 1 is a schematic view of the construction of a cement slurry bomb according to the present invention;
FIG. 2 is a schematic structural diagram of a feeding mechanism according to the present invention.
Detailed Description
The invention provides antirust tensile cement slurry and a spraying method, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an antirust tensile cement slurry for preventing tunnel efflorescence and rust prevention of a metal mesh and an anchor rod during coal mine tunnel excavation, which comprises the following components in percentage by weight:
0.3 to 0.5 percent of defoaming agent, 0.3 to 0.5 percent of hydroxypropyl methyl cellulose HPMC20 water-retaining agent, 4.2 to 5 percent of polyvinyl alcohol PVA1788, 3.5 to 4.0 percent of redispersible latex powder, 12 to 15 percent of high-strength model gypsum powder, 45 to 47 percent of first-grade fly ash, 0.7 to 0.9 percent of antirust agent and the balance of cement; the total content of the substances is 100 percent; and the water cement ratio when preparing the cement slurry is as follows: 0.6 to 0.68.
And the cement is 525 cement; the defoaming agent is one of a high-alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether or polyoxyethylene polyoxypropylene amine ether.
The invention provides a spraying method using the antirust tensile cement slurry, which comprises the following steps: preparing antirust tensile cement slurry from the above substances according to a proportion, introducing the antirust tensile cement slurry into a cement slurry high-pressure tank, enabling the cement slurry to enter a feeding mechanism 3 of the cement slurry high-pressure tank through a corresponding pipeline, enabling the cement slurry to quickly impact a first conical stopper 6 under the action of a first injection port 9, continuously quickly impact a second conical stopper 7 under the action of a second injection port 10 after the cement slurry is scattered by the first conical stopper 6, continuously quickly impact a third conical stopper 8 under the action of a third injection port 11 after the cement slurry is scattered by the second conical stopper 7, and completely crushing hard blocks in the cement slurry and enabling the hard blocks to naturally fall into the cement slurry high-pressure tank after the third conical stopper 8 after the cement slurry is impacted for three times;
synchronously pressurizing the cement slurry high-pressure tank through the first jet orifice 9, the second jet orifice 10 and the third jet orifice 11, and sealing the feeding port 2 after the cement slurry is transmitted; if the pressure in the cement paste high-pressure tank is lower than the preset value, the pressure in the cement paste high-pressure tank reaches the preset value through the pressure supplementing air inlet 12; then, the spray gun 15 is started to spray out the cement paste in the cement paste high-pressure tank;
and uniformly spraying the antirust tensile cement slurry to the surfaces of the roadway, the metal net and the anchor rod plate, wherein the coverage thickness is 1 mm.
The spraying method comprises the steps that the cement paste high-pressure tank comprises a tank body 1, a feeding port 2 is formed in the upper portion of the tank body 1, a feeding mechanism 3 is arranged at the feeding port 2, the feeding port mechanism 3 comprises a feeding barrel 5 with an air inlet cavity 4, the feeding barrel 5 is vertically arranged, a first conical stopper 6, a second conical stopper 7 and a third conical stopper 8 are sequentially arranged in the feeding barrel 5 from top to bottom, the coverage area of the first conical stopper 6, the second conical stopper 7 and the third conical stopper 8 is sequentially reduced, and cement paste which sequentially collides can finally fall into the cement paste high-pressure tank in a natural state.
A first injection port 9 is arranged at the position of the feeding cylinder 5 corresponding to the upper end of the first conical stopper 6, a second injection port 10 is arranged at the position of the feeding cylinder 5 corresponding to the upper end of the second conical stopper 7, a third injection port 11 is arranged at the position of the feeding cylinder 5 corresponding to the upper end of the third conical stopper 8, the first injection port 9, the second injection port 10 and the third injection port 11 are communicated with the air inlet cavity 4, and the injection ports are matched with the corresponding conical stoppers to break up cement slurry; the air inlet cavity 4 is connected with an external high-pressure air source to provide a power source for the jet orifice, the pressure of the external high-pressure air source is generally between 0.6MPa and 0.8MPa, and the jet orifice is matched with the corresponding conical stopper to break up the cement slurry.
Furthermore, the included angle between the jet air flow of the first jet orifice 9, the second jet orifice 10 and the third jet orifice 11 and the vertical line is 30-40 degrees, so that the cement slurry can more smoothly impact the corresponding conical stopper in the falling process. And one side of the tank body 1 is provided with a pressure supplementing air inlet 12, one side of the pressure supplementing air inlet 12 is provided with an unloading valve 13, the unloading pressure of the unloading valve 13 is 0.8MPa, when the cement slurry is introduced completely and the pressure intensity in the cement slurry high-pressure tank is less than 0.4MPa to 0.6MPa, the pressure can be supplemented through the pressure supplementing air inlet 12, and when the pressure intensity in the cement slurry high-pressure tank is higher than 0.8MPa, the unloading valve 13 starts to release the pressure. A slurry outlet pipe 14 is arranged at one side of the tank body 1, the slurry outlet pipe 14 is communicated with a spray gun 15 to finally spray out the cement slurry, and a discharge opening 16 can be arranged at the bottom of the tank body to ensure that the tank body 1 can be repeatedly used.
To further illustrate the present invention, the following examples are given by way of illustration and not limitation.
Examples 1
The antirust tensile cement slurry comprises the following components in percentage by weight: 0.3% of a defoaming agent; 0.3 percent of hydroxypropyl methyl cellulose HPMC20 ten thousand water-retaining agent; 4.7% polyvinyl alcohol PVA 1788; 3.8 percent of redispersible latex powder YJ 606; 15% of high-strength model gypsum powder; 45% of first-grade fly ash; 0.8% of an antirust agent; the balance is cement, the water-cement ratio is 0.6 when the slurry is prepared, and the spraying method is applied to coal roadways or rock roadways with drenching water. By effectively reducing the water-cement ratio and the water-retaining agent, the consolidation strength and the adhesive force of the slurry can be increased, and the phenomena of slurry layer crushing and cracking caused by roadway deformation or water drenching are reduced.
EXAMPLES example 2
The antirust tensile cement slurry comprises the following components in percentage by weight: 0.4% of a defoaming agent; 0.4 percent of hydroxypropyl methyl cellulose HPMC20 ten thousand water-retaining agent; 4.5% polyvinyl alcohol PVA 1788; 3.5 percent of redispersible latex powder YJ 606; 15% of high-strength model gypsum powder; 45% of first-grade fly ash and 0.8% of antirust agent; the balance is cement, and the water cement ratio is 0.68 when the slurry is prepared. The spraying method is applied to a stable rock roadway, and the surface of the roadway is uniformly covered by increasing the liquidity of slurry, so that the corrosion prevention time is effectively prolonged.
It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A spraying method of antirust tensile cement slurry for preventing tunnel efflorescence and preventing rust of a metal mesh and an anchor rod during coal mine tunnel excavation is disclosed, wherein the antirust tensile cement slurry comprises the following components in percentage by weight:
the total content of the substances is 100 percent;
the cement slurry is prepared by the following steps: 0.6 to 0.68;
the method is characterized by comprising the following steps: preparing antirust tensile cement slurry from the substances according to a proportion, introducing the antirust tensile cement slurry into a cement slurry high-pressure tank, enabling the cement slurry to enter a feeding mechanism of the cement slurry high-pressure tank through a corresponding pipeline, enabling the cement slurry to quickly impact a first conical stopper under the action of a first injection port, continuously quickly impact a second conical stopper under the action of a second injection port after the cement slurry is scattered by the first conical stopper, continuously quickly impact the third conical stopper under the action of a third injection port after the cement slurry is scattered by the second conical stopper, and thoroughly crushing hard blocks in the cement slurry and enabling the hard blocks to naturally fall into the cement slurry high-pressure tank after the third conical stopper;
synchronously pressurizing the cement slurry high-pressure tank through the first jet orifice, the second jet orifice and the third jet orifice, and sealing the feeding port after the cement slurry is transmitted; if the pressure in the cement paste high-pressure tank is lower than the preset value, enabling the pressure in the cement paste high-pressure tank to reach the preset value through a pressure supplementing air inlet; then, opening a spray gun to spray out the cement slurry in the cement slurry high-pressure tank;
and uniformly spraying the antirust tensile cement slurry to the surfaces of the roadway, the metal net and the anchor rod plate, wherein the coverage thickness is 1 mm.
2. The method of claim 1, wherein the cement is 525 cement for preventing the efflorescence of the tunnel and preventing the rust prevention of the metal mesh and the anchor rod during the driving of the coal mine tunnel.
3. The method as claimed in claim 1, wherein the defoaming agent is one of a higher alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether and polyoxyethylene polyoxypropylene amine ether.
4. The method as claimed in claim 1, wherein the grout pressure tank includes a tank body, a material inlet is formed at an upper portion of the tank body, a material inlet mechanism is disposed at the material inlet, the material inlet mechanism includes a feeding cylinder having an air inlet cavity, the feeding cylinder is vertically disposed, a first conical stopper, a second conical stopper and a third conical stopper are sequentially disposed in the feeding cylinder from top to bottom, coverage areas of the first conical stopper, the second conical stopper and the third conical stopper are sequentially reduced, the feeding cylinder is provided with a first injection port at a position corresponding to an upper end of the first conical stopper, the feeding cylinder is provided with a second injection port at a position corresponding to an upper end of the second conical stopper, the feeding cylinder is provided with a third injection port at a position corresponding to an upper end of the third conical stopper, the first injection port, the second injection port and the third injection port are communicated with the air inlet cavity, and the injection ports are matched with the corresponding conical stoppers to break up cement slurry.
5. The method as claimed in claim 4, wherein the angle between the air flow of the first, second and third jet nozzles and the vertical line is 30-40 °.
6. The method for spraying the antirust tensile cement slurry for preventing the weathering of the tunnel and preventing the rust of the metal mesh and the anchor rod during the coal mine tunnel driving according to claim 4, wherein a pressure supplementing air inlet is arranged on one side of the tank body, an unloading valve is arranged on one side of the pressure supplementing air inlet, and the unloading pressure of the unloading valve is 0.8 MPa.
7. The method for spraying the antirust tensile cement slurry for preventing the weathering of the tunnel and preventing the rust of the metal mesh and the anchor rod during the coal mine tunnel driving according to claim 4, wherein one side of the tank body is provided with a slurry outlet pipe which is communicated with a spray gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711169805.9A CN108033747B (en) | 2017-11-22 | 2017-11-22 | Antirust tensile cement slurry and spraying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711169805.9A CN108033747B (en) | 2017-11-22 | 2017-11-22 | Antirust tensile cement slurry and spraying method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108033747A CN108033747A (en) | 2018-05-15 |
| CN108033747B true CN108033747B (en) | 2020-04-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08245255A (en) * | 1995-03-08 | 1996-09-24 | Hazama Gumi Ltd | Low powder spraying concrete composition |
| CN102924030A (en) * | 2012-01-16 | 2013-02-13 | 四川达竹煤电(集团)有限责任公司 | Novel underground spray coating material and preparation method thereof |
| CN103693922A (en) * | 2013-09-16 | 2014-04-02 | 山东科技大学 | Mining spraying material formula and application method |
| CN106927773A (en) * | 2017-04-10 | 2017-07-07 | 龙岩学院 | Mining spraying wind leaking stoppage material and preparation facilities |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08245255A (en) * | 1995-03-08 | 1996-09-24 | Hazama Gumi Ltd | Low powder spraying concrete composition |
| CN102924030A (en) * | 2012-01-16 | 2013-02-13 | 四川达竹煤电(集团)有限责任公司 | Novel underground spray coating material and preparation method thereof |
| CN103693922A (en) * | 2013-09-16 | 2014-04-02 | 山东科技大学 | Mining spraying material formula and application method |
| CN106927773A (en) * | 2017-04-10 | 2017-07-07 | 龙岩学院 | Mining spraying wind leaking stoppage material and preparation facilities |
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