CN102733823B - Mining method for jetting concrete in wet type - Google Patents

Mining method for jetting concrete in wet type Download PDF

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Publication number
CN102733823B
CN102733823B CN201210226964.9A CN201210226964A CN102733823B CN 102733823 B CN102733823 B CN 102733823B CN 201210226964 A CN201210226964 A CN 201210226964A CN 102733823 B CN102733823 B CN 102733823B
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cement slurry
concrete
jetting
delivery line
sandstone mix
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CN102733823A (en
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颜威合
高运立
张涛
张绍春
张效瑞
赵国卿
朱学锋
常占锋
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Henan Igood Keming Electromechanical Equipment Co. Ltd
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Henan Coal Science Research Institute Co Ltd
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Abstract

The invention relates to a mining method for jetting concrete in a wet type; a method comprises the following steps: preparing cement slurry; stirring gravel mixing material; starting air source to input high pressure air to a gravel mixing material transport pipeline in a jetting procedure; and inputting the cement slurry to a cement slurry transport pipeline through transport equipment; after jetting the cement slurry by a nozzle, adding the gravel mixing material to a jetting machine; under the action of the high pressure air, mixing and stirring the cement slurry and the gravel mixing material; finally, jetting the concrete from the nozzle. According to the invention, the method depends on current jetting equipment; a transport distance (larger than or equal to 60m) of jet concrete is can be increased greatly on a condition of ensuring invariable wet-type concrete jetting advantages; simultaneously, the method effectively avoids problems that large-scale stirring is used hardly and concrete transport equipment is limited under a coal well; production efficiency and jetting quality are improved greatly; in addition, powder dust concentration near the jetting machine is less than or equal to 10mg/m<3>.

Description

A kind of method of mine wet-type sprayed concrete
Technical field
The present invention relates to technical field of concrete construction, be specifically related to a kind of method of mine wet-type sprayed concrete.
Background technique
Sprayed concrete utilizes pressurized air or other power, by the mixed concrete aggregate that coordinates by a certain percentage and additive, by Cemented filling and with high velocity jet to the concrete supporting formed by the upper setting and harden of spray plane (scar, wall, tunnel liner etc.).Because sprayed concrete has, intensity is high, cost is low, efficiency advantages of higher, is therefore widely used in the supporting construction such as tunnel, colliery.At present, the wet shotcrete technology that what adopt both at home and abroad extensively is dry-type jetting, tidal is sprayed and occurred afterwards.Wherein, from the wet sprayed concrete technology that the sixties in 20th century rises, owing to overcoming deficiency when dry-type jetting and tidal spraying operation, have mixing ratio be easy to control, rebound degree is low, dust concentration is low, manufacturing efficiency advantages of higher, obtain in supporting operation and develop rapidly and apply.Current, when underground coal mine carries out wet sprayed concrete construction, owing to being subject to working space restriction, large-scale stirring, conveying equipment is difficult to promote, coal mining enterprise is also mainly with manually stirring and small-power mixing plant are main, its sprayer selected also is rely on high-pressure blast to carry out carrying and sprayed concrete mostly simultaneously, although it is little that such type has volume, lightweight, advantages of simple structure and simple, but its fed distance shorter (horizontal transport distance is generally no more than 30m) during owing to carrying out wet shotcrete technology, executing the continuous transloading equipment of man-hour requirement and raw material, labor intensity when each of which increases construction and the amount of labour, reduce manufacturing efficiency.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method of new type mining wet sprayed concrete, the method relies on existing spraying equipment, ensureing on the basis that wet sprayed concrete advantage is constant, fed distance during sprayed concrete can be increased substantially, effectively prevent the restriction that underground coal mine is difficult to use large-scale stirring, delivering concrete equipment simultaneously, greatly improve manufacturing efficiency and jet quality.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A method for mine wet-type sprayed concrete, comprises the following steps:
(1) modulate cement slurry by the ratio of mud 0.4 ~ 0.8, to be mixed evenly after through inputing in cement slurry delivery line by conveying equipment;
(2) by the weight ratio of 1: 1, sand, stone aggregate mixing mixing are become sandstone mix, this sandstone mix inputs to sandstone mix delivery line via sprayer;
(3) described cement slurry delivery line and sandstone mix delivery line length are respectively 5 ~ 100m, and make cement slurry delivery line be connected with described sandstone mix delivery line close to shower nozzle 3 ~ 20m place;
(4) wind regime is first opened when spraying to sandstone mix delivery line input high-pressure blast (blast 0.4 ~ 0.8MPa, blast consumption 10 ~ 15m 3/ min), cement slurry is inputted to cement slurry delivery line again via conveying equipment, after shower nozzle has cement slurry to spray, start to add sandstone mix to injection apparatus, wherein the weight ratio of cement slurry and sandstone mix is adjusted to 0.2 ~ 0.6, under high pressure wind action, complete the mixing of cement slurry and sandstone mix, stirring, finally from shower nozzle ejection concrete;
(5), after having sprayed, first stop adding sandstone mix, then stop adding cement slurry, finally close wind regime.
In described step (4), in sandstone mix, add ZWSA powder accelerator, to strengthen jeting effect by 1 ~ 7% of concrete gross weight.
In described step (4), directly add GOR-I type liquid accelerating agent or 8604 type liquid accelerating agents at shower nozzle place, to strengthen jeting effect by 3 ~ 6% of concrete gross weight.
Particle diameter≤the 15mm of described stone aggregate.
Described sand is medium coarse sand, its modulus of fineness FM=2.2 ~ 2.6, reduces shrinkage crack.
Described sandstone mix sand used, stone are all rinsed well with water.Concrete binding power can be improved, reduce and spray rebound degree, increase concrete strength.
In described step (4), the Concrete temperature controlling of shower nozzle ejection is 15 ~ 25 DEG C.
Described sprayer is rotor-type concrete sprayer.
The present invention has actively useful effect:
In the present invention, cement can adopt water-tight equipment to carry out stirring pulping separately, and avoiding problems a large amount of appearance of dust when cement and sand material stirring, the ratio of mud also more easily controls simultaneously; That adds toward sprayer only has sand material and cement-free, effectively can reduce dust concentration around sprayer, and enhance productivity; In the initial procedure of conveying sandstone mix, sand material carries with siccative state, make under the prerequisite not changing sprayer kind and model, significantly can improve fed distance, reduce the probability of happening of line clogging, and cement slurry just can carry out long distance delivery by existing equipment after simply transforming; At distance shower nozzle 3 ~ 20m place, cement slurry delivery line is incorporated in sandstone mix delivery line, under high pressure wind action, the two is carried out mixing, stir and carrying, avoiding problems be difficult to adopt large-scale stirring at underground coal mine, conveying equipment carries out stirring and the restriction of delivering concrete, rapid hardening powder can be added in sandstone mix simultaneously or directly at shower nozzle place add accelerator makes the better effects if of sprayed concrete, quality higher, and the dust at shower nozzle place is also less.The inventive method relies on existing spraying equipment, ensureing on the basis that wet sprayed concrete advantage is constant, the fed distance (fed distance>=60m) of sprayed concrete can be increased substantially, effectively prevent the restriction that underground coal mine is difficult to use large-scale stirring, delivering concrete equipment simultaneously, greatly improve manufacturing efficiency and jet quality, and the dust concentration≤10mg/m on sprayer side 3, operating environment is good, and relevant performance index are see table 1.
Table 1 the present invention and dry-type jetting and conventional wet spraying technique Performance comparision
Index Hybrid wet shot (the present invention) Conventional wet shot Dry-type jetting
Device structure Simpler More complicated Simply
Corollary equipment Need not feeder, stirrer Palpus feeder, stirrer are supporting Need not feeder, stirrer
Dust concentration Can 50 ~ 80% be reduced Can 50 ~ 80% be reduced Higher
Air consumption Can about 50% be reduced Can about 50% be reduced Larger
Rebound degree Can about 10% be reduced Can about 10% be reduced Comparatively large (20 ~ 40%)
The ratio of mud 0.4~0.8 0.4~0.8 0.4~0.5
Fed distance ≥60 ≤30 ≤100
Operation easier Be easier to More complicated Easily
Compressive strength of sprayed concrete Improve about 20% Improve about 20% Lower, general 15 ~ 25Mpa
Cleaning convenience Easy cleaning Be not easy cleaning Easy cleaning
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Fig. 1 is site layout project schematic diagram of the present invention.
In figure, 1-sprayer, 2-sandstone mix delivery line, 3-tunnel, 4-shower nozzle, 5-threeway, 6-cement slurry delivery line, 7-cement slurrying conveying equipment.
Embodiment
Various construction equipments involved in following embodiment, if no special instructions, are conventional construction equipment.
The method of embodiment's 1 one kinds of mine wet-type sprayed concretes:
Utilize cement slurrying conveying equipment 7 cement to be made the cement slurry of uniformity by the ratio of mud 0.6, be then transported to by cement slurry in cement slurry delivery line 6, delivery line length is 80m; After the stone aggregate (sandstone is rinsed well with clear water with front) of the medium coarse sand of modulus of fineness 2.5, particle diameter≤15mm is mixed with mix by weight 1: 1, rotor spraying machine 1 is utilized to be delivered to by sandstone mix in sandstone mix delivery line 2, fed distance is 80m, then apart from shower nozzle 4 apart from being 15m place, by two threeways 5, cement slurry delivery line 6 is incorporated in sandstone mix delivery line 2; Under high pressure wind action, cement slurry and sandstone mix carry out mixing, stir and carrying in pipeline, until shower nozzle 4 sprays; During work, first open wind regime and input high-pressure blast (pressure 0.6Mpa, blast consumption 12m to sandstone mix delivery line 2 3/ min), then input cement slurry to cement slurry delivery line 6, after shower nozzle 4 has cement slurry to spray, start to add sandstone mix to sprayer 1, press concrete gross weight 4% directly adds GOR-I type liquid accelerating agent simultaneously at shower nozzle place, it is 20 ~ 25 DEG C that concrete ejection temperature controls; After injection completes, first stop adding sandstone mix, then stop adding cement slurry, finally close wind regime.
Above embodiment is just in order to illustrate the present invention, instead of limitation of the present invention.On the basis of the above description, the present invention can be many modifications and changes.Within the scope of the appended claims, the present invention can have and is different from other above-mentioned implementation, changes cement pulping equipment and conveying equipment, change sprayer kind and model, change cement slurry proportioning and sandstone mix proportioning and adopts different sand materials and cement slurry mixed method etc. all within patent requirements scope of the present invention.

Claims (5)

1. a method for mine wet-type sprayed concrete, comprising:
(1) modulate cement slurry by the ratio of mud 0.4 ~ 0.8, to be mixed evenly after through inputing in cement slurry delivery line by conveying equipment;
(2) get sand by the weight ratio of 1: 1, stone aggregate mixing mixing becomes sandstone mix, this sandstone mix is delivered in sandstone mix delivery line by sprayer;
It is characterized in that, further comprising the steps of:
(3) described cement slurry delivery line and sandstone mix delivery line length are respectively 5 ~ 100m, and make cement slurry delivery line be connected with described sandstone mix delivery line close to shower nozzle 3 ~ 20m place;
(4) when spraying, first open wind regime to sandstone mix delivery line input blast be 0.4 ~ 0.8MPa, flow is 10 ~ 15m 3the high-pressure blast of/min, cement slurry is inputted to cement slurry delivery line again via conveying equipment, after shower nozzle has cement slurry to spray, start to add sandstone mix to sprayer, wherein the weight ratio of cement slurry and sandstone mix is 0.2 ~ 0.6, under high pressure wind action, complete the mixing of cement slurry and sandstone mix, stirring, finally from shower nozzle ejection concrete; In sandstone mix, add ZWSA powder accelerator by 1 ~ 7% of concrete gross weight or directly add GOR-I type liquid accelerating agent or 8604 type liquid accelerating agents at shower nozzle place, to strengthen jeting effect by 3 ~ 6% of concrete gross weight;
(5), after having sprayed, first stop adding sandstone mix, then stop adding cement slurry, finally close wind regime;
Described sprayer is rotor-type concrete sprayer.
2. the method for mine wet-type sprayed concrete according to claim 1, is characterized in that, the particle diameter≤15mm of described stone aggregate.
3. the method for mine wet-type sprayed concrete according to claim 1, is characterized in that, described sand is medium coarse sand, its modulus of fineness FM=2.5 ~ 3.2.
4. the method for mine wet-type sprayed concrete according to claim 1, is characterized in that, described sandstone mix sand used, stone are all rinsed well with water.
5. the method for mine wet-type sprayed concrete according to claim 1, is characterized in that, in described step (4), the Concrete temperature controlling of shower nozzle ejection is 15 ~ 25 DEG C.
CN201210226964.9A 2012-07-03 2012-07-03 Mining method for jetting concrete in wet type Active CN102733823B (en)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102877863A (en) * 2012-10-19 2013-01-16 郑州正通矿山设备制造有限公司 Wet-type injecting and reinforcing method of coal mine underworkings
CN103061787B (en) * 2013-01-10 2015-04-22 河南省煤炭科学研究院有限公司 Mining wet type concrete spraying device
CN104314586A (en) * 2014-10-21 2015-01-28 山西潞安矿业(集团)有限责任公司 Long-distance guniting material delivery system
CN104655515A (en) * 2015-02-13 2015-05-27 长安大学 Method for measuring wet spraying resilient rate of primary lining concrete in tunnel construction
CN106121239A (en) * 2016-08-01 2016-11-16 北京市勘察设计研究院有限公司 A kind of omnidistance Wet-type concrete injection CG&MA system and method
CN109485320A (en) * 2018-11-28 2019-03-19 铜陵有色金属集团股份有限公司 The operating method of wet sprayed concrete technique for light section mine working

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Publication number Priority date Publication date Assignee Title
CN2077482U (en) * 1990-07-31 1991-05-22 大同矿务局生产技术处 Process and implements for wet-spraying concrete support in gallery
NL1016830C2 (en) * 2000-12-08 2002-06-19 Pieter Faber Tunnelling machine, has concrete injector devices mounted on tapered part of its tubular frame
JP2003314198A (en) * 2002-04-24 2003-11-06 Sumitomo Mitsui Construction Co Ltd Tunnel lining apparatus
CN201133252Y (en) * 2007-12-27 2008-10-15 北京中煤矿山工程有限公司 Wet concrete jetting apparatus
CN201288570Y (en) * 2008-09-28 2009-08-12 煤炭科学研究总院南京研究所 Wet concrete injector set
CN201363338Y (en) * 2009-03-24 2009-12-16 河南省煤炭科学研究院有限公司 Hydraulic cylinder active volume compensating mechanism and concrete wet-sprayer with compensating piston

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2077482U (en) * 1990-07-31 1991-05-22 大同矿务局生产技术处 Process and implements for wet-spraying concrete support in gallery
NL1016830C2 (en) * 2000-12-08 2002-06-19 Pieter Faber Tunnelling machine, has concrete injector devices mounted on tapered part of its tubular frame
JP2003314198A (en) * 2002-04-24 2003-11-06 Sumitomo Mitsui Construction Co Ltd Tunnel lining apparatus
CN201133252Y (en) * 2007-12-27 2008-10-15 北京中煤矿山工程有限公司 Wet concrete jetting apparatus
CN201288570Y (en) * 2008-09-28 2009-08-12 煤炭科学研究总院南京研究所 Wet concrete injector set
CN201363338Y (en) * 2009-03-24 2009-12-16 河南省煤炭科学研究院有限公司 Hydraulic cylinder active volume compensating mechanism and concrete wet-sprayer with compensating piston

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Patentee before: Henan Coal Science Research Institute Co., Ltd.

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