CN113622967B - FRP-steel wire mesh skeleton plastic composite pipe constraint gangue concrete pier column and construction method thereof - Google Patents
FRP-steel wire mesh skeleton plastic composite pipe constraint gangue concrete pier column and construction method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 112
- 239000010959 steel Substances 0.000 title claims abstract description 112
- 239000002131 composite material Substances 0.000 title claims abstract description 110
- 239000004033 plastic Substances 0.000 title claims abstract description 103
- 229920003023 plastic Polymers 0.000 title claims abstract description 103
- 239000004567 concrete Substances 0.000 title claims abstract description 57
- 238000010276 construction Methods 0.000 title claims abstract description 7
- 239000003245 coal Substances 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 24
- 230000000452 restraining effect Effects 0.000 claims abstract description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000011049 filling Methods 0.000 claims abstract description 12
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 11
- 239000000292 calcium oxide Substances 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 11
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 11
- 239000010440 gypsum Substances 0.000 claims abstract description 11
- 239000002699 waste material Substances 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 239000002956 ash Substances 0.000 claims description 7
- 239000002775 capsule Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
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- 238000001556 precipitation Methods 0.000 claims description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000003063 flame retardant Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
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- 238000005516 engineering process Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
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- 239000003733 fiber-reinforced composite Substances 0.000 description 32
- 238000000034 method Methods 0.000 description 11
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- 229920000049 Carbon (fiber) Polymers 0.000 description 3
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/02—Non-telescopic props
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/005—Props; Chocks, e.g. made of flexible containers filled with backfilling material characterised by the material
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- Mining & Mineral Resources (AREA)
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Abstract
The invention discloses an FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column, which is characterized in that: the steel wire mesh skeleton plastic composite pipe and the FRP pipe arranged in the steel wire mesh skeleton plastic composite pipe form an external constraint material, and coal gangue concrete is used as an internal filling material. The underground coal gangue after classified crushing and sorting by a jaw crusher is directly filled into an FRP-steel wire mesh skeleton plastic composite pipe, mine water and cementing materials taking fly ash, blast furnace slag, waste gypsum and quicklime as main raw materials are uniformly stirred and then injected into the FRP-steel wire mesh skeleton plastic composite pipe, so that the FRP-steel wire mesh skeleton plastic composite pipe restraining coal gangue concrete pier column is formed. The gangue concrete has the advantages of economy, environmental protection and on-site preparation. The FRP-steel wire mesh skeleton plastic composite pipe fully exerts the advantages of light weight, high strength and large deformation of the FRP material. The invention also discloses a construction method of the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a combined pier column adopting fiber reinforced composite (FRP) and steel wire mesh skeleton plastic composite pipes to restrain gangue concrete.
Background
With the increase of coal mining depth, the traditional anchor bolt supporting technology cannot meet the basic requirements of roadway support. Passive supporting structures represented by concrete filled steel tubes have attracted attention. However, once the steel pipe is buckled, the continuously increased restraining force cannot be provided, and the bearing capacity of the steel pipe concrete column and the steel pipe concrete support which adopt the steel pipe as the restraining material is reduced. Meanwhile, the dead weight of the precast steel pipe concrete column on the ground is large, professional transportation and installation equipment is needed in the actual use process, and the exploitation cost of coal resources is certainly increased. On the other hand, the steel pipe used by the steel pipe concrete column is easy to generate spark when encountering collision, so that certain potential safety hazard exists in the use process of the steel pipe concrete column in a high-gas mine. The adoption of materials with light weight, high strength and continuously increasing mechanical properties is a main way to solve the problem. The fiber reinforced composite material is a nonmetallic material formed by the collective combination of reinforcing materials such as carbon fiber, glass fiber and the like and resin, and has natural corrosion resistance. In addition, taking carbon fiber composite material as an example, the tensile strength of the carbon fiber composite material can reach 2300 MPa, which is 10 times of that of common steel. Unlike the mechanical characteristics of steel after buckling, composite materials exhibit linearly increasing stress strain characteristics making them ideal materials for replacing downhole steel.
Coal gangue, which is an unavoidable solid waste in the coal mining process, has become a major concern for the ecological environment protection of coal mines. Along with the continuous deepening and implementation of the sustainable development concept of national green development and ecological priority, the comprehensive utilization problem of the coal gangue, which occupies up to 40% of solid waste, is brought into wide attention of industries and society again. As a large country for coal production and consumption, the annual production of gangue solid waste in China accounts for 10% -25% of the coal yield, and the annual discharge amount is more than 8 hundred million tons. Because of the relative hysteresis of comprehensive utilization of the gangue, the storage quantity of the gangue generated by the current concept reaches 50-60 hundred million tons. The existing 1900 seats of the national gangue hill occupy a large amount of land, and the generated discharge directly pollutes underground water, air and soil, so the method is a major pollution source which is needed to be treated urgently.
Mine water refers to all water filled into underground mining space in the coal mine mining process, is polluted underground water in the coal mine mining process, and is required to be drained in the mining process in order to ensure safe production and good working environment. According to incomplete statistics, the average ton coal water inflow of the whole country is 2-4 cubic meters, the annual mine water discharged outside the country is more than 30 hundred million cubic meters, and the mine water accounts for about 5% of the mining amount of underground water of the whole country and is 40% of the annual domestic water of the city of China.
Disclosure of Invention
The present invention aims to solve at least to some extent one of the above technical problems.
The technical problem is not solved, and the invention provides a coal mine underground support pier column structure which adopts gangue concrete as an internal filling material and FRP-steel wire mesh skeleton plastic composite pipes as external constraint materials, and the coal mine underground support pier column structure is used as a potential substitute product of the existing steel tube concrete column. The FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column has the advantages of economy, environmental protection, excellent structural mechanics and the like.
According to the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column, the steel wire mesh skeleton plastic composite pipe and the FRP pipe arranged in the steel wire mesh skeleton plastic composite pipe are made of external restraining materials, and gangue concrete is used as an internal filling material. The steel wire mesh skeleton of the steel wire mesh skeleton plastic composite pipe is formed by welding high-strength steel wires, and the external plastic is engineering plastic with flame-retardant and antistatic properties. The FRP pipe placed in the steel wire mesh skeleton plastic composite pipe is a finished FRP pipe prepared by adopting a winding or drawing and winding process. Wherein the fibers constituting the FRP pipe are arranged mainly in the transverse direction, and the volume ratio of the transverse fibers is not less than 70%;
according to one embodiment of the invention, the cross section of the FRP-steel wire mesh skeleton plastic composite pipe is round, oval or round rectangle. The FRP pipe can be concentric with the steel wire mesh skeleton plastic composite pipe to give full play to the compression resistance. Meanwhile, the FRP pipe and the steel wire mesh skeleton plastic composite pipe can be eccentrically placed according to the requirements so as to meet different bias voltage requirements;
according to one embodiment of the invention, the aggregate for forming the gangue concrete is a gangue body with the grain size of 10-60 mm after graded crushing and sorting by a jaw crusher under the well;
according to one embodiment of the invention, the cementing material for forming the gangue concrete is mixed powder cementing material prepared from fly ash, blast furnace slag, waste gypsum and quicklime according to a certain proportion;
according to one embodiment of the invention, the water in the process of preparing the gangue concrete can be directly obtained underground. Is mine water subjected to precipitation treatment.
According to one embodiment of the invention, the gangue concrete takes an FRP-steel wire mesh skeleton plastic composite pipe as a filling template. And (3) injecting slurry formed by mine water and cementing materials into the FRP-steel wire mesh skeleton plastic composite pipe filled with the gangue to form the stirring-free gangue concrete.
The invention also provides a construction method of the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier stud with simple construction process, which comprises the following steps:
firstly, cutting an FRP pipe and a steel wire mesh skeleton plastic composite pipe into a length required by design on the ground;
uniformly stirring the fly ash, the blast furnace ash, the waste gypsum and the quick lime according to a designed proportion, sealing, and transporting to a specified underground position;
thirdly, placing the FRP pipe conveyed underground into a steel wire mesh skeleton plastic composite pipe, and fixing the two pipes at the upper end and the lower end according to the designed eccentricity through plastic buckles;
erecting the fixed FRP-steel wire mesh skeleton plastic composite pipe along the height direction of the roadway, and adopting a single hydraulic prop to temporarily support the roadway top plate around the fixed FRP-steel wire mesh skeleton plastic composite pipe within two meters;
crushing the coal gangue underground by adopting a jaw crusher, and screening out coal gangue blocks with the particle size of 10-60 mm;
step six, conveying crushed and screened gangue blocks to the vicinity of the plastic composite pipe with the FRP-steel wire mesh framework through a flat car, and injecting the gangue blocks into the plastic composite pipe with the FRP-steel wire mesh framework through a portable belt conveyor;
step seven, stirring the mine water which does not contain macroscopic solid impurities after precipitation and filtration and the mixed powdery cementing material consisting of fly ash, blast furnace slag, waste gypsum and quicklime according to a designed proportion;
step eight, injecting the slurry after stirring and mixing into the FRP-steel wire mesh skeleton plastic composite pipe filled with the gangue blocks through a grouting pump until the FRP-steel wire mesh skeleton plastic composite pipe is completely filled with the gangue blocks;
step nine, placing a rubber capsule with grouting holes and exhaust holes above the FRP-steel wire mesh skeleton plastic composite pipe, and injecting slurry into the rubber capsule through the grouting holes to realize complete contact between the FRP-steel wire mesh skeleton plastic composite pipe and the roadway roof;
step ten, sequentially filling FRP-steel wire mesh skeleton plastic composite pipes filled with gangue blocks until all the composite pipes are full, and completing a working cycle;
and step eleven, after the filling work is finished for 7 days, removing the single hydraulic prop erected around the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column.
Additional aspects and advantages of the invention will be described in connection with the embodiments.
Drawings
FIG. 1 is a schematic structural view of an FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the composition structure of a composite pipe of the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column according to the embodiment of the invention;
FIG. 3 is a first cross-sectional form of an FRP-wire mesh backbone plastic composite tube restraint gangue concrete pier column in accordance with an embodiment of the present invention;
FIG. 4 is a second cross-sectional form of an FRP-wire mesh backbone plastic composite tube restraint gangue concrete pier column in accordance with an embodiment of the present invention;
FIG. 5 is a third cross-sectional form of an FRP-wire mesh backbone plastic composite tube restraint gangue concrete pier column in accordance with an embodiment of the present invention;
reference numerals:
a composite pipe 1; coal gangue concrete 2; an FRP pipe 3; and a steel wire mesh skeleton plastic composite pipe 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
As shown in fig. 1 and 2, the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column according to the embodiment of the invention comprises a composite pipe 1 and gangue concrete 2. The composite pipe 1 consists of a steel wire mesh skeleton plastic composite pipe 4 and an FRP pipe 3 arranged in the steel wire mesh skeleton plastic composite pipe, and plays a role in constraint. The steel wire mesh skeleton of the steel wire mesh skeleton plastic composite pipe is formed by welding high-strength steel wires, and the external plastic is engineering plastic with flame-retardant and antistatic properties. The FRP pipe placed in the steel wire mesh skeleton plastic composite pipe is a finished FRP pipe prepared by a winding or pulling and winding process. Wherein the fibers constituting the FRP pipe are arranged mainly in the transverse direction, and the volume ratio of the transverse fibers is not less than 70%; due to the special linear elastic stretching property of the FRP pipe with the light high-strength property, the gangue concrete which can be filled inside can provide continuously increased constraint force when being pressed by a shaft, and the strength and deformability of the gangue concrete can be effectively improved. However, as a typical linear material, once the FRP pipe is broken, the bearing capacity of the FRP constraint gangue concrete is reduced to zero instantaneously and cannot meet the requirement of coal mine roadway support, so that the pure use of the FRP pipe to constraint the gangue concrete has certain limitation in the aspect of coal mine roadway support. The steel wire mesh skeleton plastic composite pipe has larger deformability, but the lower tensile strength of the steel wire mesh skeleton plastic composite pipe can not provide continuous and effective restraining force for gangue concrete, and the improvement effect on the concrete strength is not obvious. Through combining FRP pipe and wire net skeleton plastics composite pipe, can guarantee that novel combination pier stud has the ability of large deformation under the effectively constraint's of full play FRP pipe prerequisite. On the other hand, the steel wire mesh skeleton plastic composite has the characteristics of flame retardance and static resistance, so that the fireproof design requirement of the FRP pipe can be not considered when the FRP pipe is placed in the FRP pipe for use.
As shown in fig. 3, the section form of the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column according to the embodiment of the invention may be circular. The FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column with the circular cross section can be used for supporting a common mining roadway.
As shown in fig. 4 to 5, the cross-sectional form of the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column according to the embodiment of the invention may be oval or rounded rectangle. The pier column with the oval or round-corner rectangular section is mainly used for constructing the gob-side entry retaining roadside filling wall.
The gangue concrete in the embodiment of the invention takes an FRP-steel wire mesh skeleton plastic composite pipe as a template, and slurry prepared from mine water and cementing materials according to a designed proportion is injected into the FRP-steel wire mesh skeleton plastic composite pipe filled with gangue blocks to form the gangue concrete without stirring. The main components of the cementing material comprise fly ash, blast furnace ash, waste gypsum and quicklime. Preferably, the volume fractions of fly ash, blast furnace ash, waste gypsum and quicklime are 30%, 40%,20% and 10%, respectively. Preferably, the mass ratio of the mine water to the cementing material is 0.3.
The invention provides a construction method of an FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column, which comprises the following steps:
cutting the FRP pipe and the steel wire mesh skeleton plastic composite pipe into the length required by design on the ground. Wherein the outer diameter of the FRP pipe is 500 mm, and the inner diameter of the steel wire mesh skeleton plastic composite pipe is 800 mm. The FRP pipe and the steel wire mesh skeleton plastic composite pipe have the same length and are the minimum height of the underground roadway;
and step two, uniformly stirring the fly ash, the blast furnace ash, the waste gypsum and the quicklime according to a designed proportion, sealing, and transporting to a specified underground position. The volume fractions of the fly ash, the blast furnace ash, the waste gypsum and the quicklime are respectively 30%, 40%,20% and 10%;
and thirdly, placing the FRP pipe conveyed underground into a steel wire mesh skeleton plastic composite pipe, and fixing the upper end and the lower end of the FRP pipe according to the designed eccentricity through plastic buckles. According to actual needs, if the FRP-steel wire mesh skeleton plastic composite pipe constraint gangue concrete pier column is used for reinforcing and supporting a common mining roadway, the eccentricity is zero, and the FRP pipe and the steel wire mesh skeleton plastic composite pipe are concentrically placed. If the FRP-steel wire mesh skeleton plastic composite pipe is used for restraining gangue concrete pier columns for gob-side entry retaining or other roadway support under the action of strong mining influence, the eccentricity is adjusted according to actual conditions, namely the distance between the central position of the FRP pipe and the central position of the steel wire mesh skeleton plastic composite pipe is 50-100 mm;
and fourthly, erecting the fixed FRP-steel wire mesh skeleton plastic composite pipe along the height direction of the roadway, and adopting a single hydraulic prop to temporarily support the roadway top plate around the fixed FRP-steel wire mesh skeleton plastic composite pipe within two meters. Before the FRP-steel wire mesh skeleton plastic composite pipe is erected, cleaning floating coal and sundries of a roadway bottom plate;
crushing the coal gangue underground by adopting a jaw crusher, and collecting coal gangue blocks with the particle size of 10-60 mm;
step six, conveying crushed and screened gangue blocks to the vicinity of the plastic composite pipe with the FRP-steel wire mesh framework through a flat car, and injecting the gangue blocks into the plastic composite pipe with the FRP-steel wire mesh framework through a portable belt conveyor;
step seven, stirring the mine water which does not contain macroscopic solid impurities after precipitation and filtration and the powder consisting of fly ash, blast furnace ash, waste gypsum and quicklime according to a designed proportion;
step eight, injecting the slurry after stirring and mixing into the FRP-steel wire mesh skeleton plastic composite pipe filled with the gangue blocks through a grouting pump until the FRP-steel wire mesh skeleton plastic composite pipe is completely filled with the gangue blocks;
and step nine, placing a rubber capsule with grouting holes and exhaust holes above the FRP-steel wire mesh skeleton plastic composite pipe, and injecting slurry into the rubber capsule through the grouting holes to realize complete contact between the FRP-steel wire mesh skeleton plastic composite pipe and the coal gangue concrete pier column and the roadway roof. Under the general condition, the actual excavation height of the roadway is larger than the design height, and the pier stud can be contacted with the roadway roof to the greatest extent by adopting the flexible rubber capsule capable of being injected with slurry;
step ten, sequentially filling FRP-steel wire mesh skeleton plastic composite pipes filled with gangue blocks until all the composite pipes are full, and completing a working cycle;
and step eleven, after the filling work is finished for 7 days, removing the single hydraulic prop erected around the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column.
While embodiments of the present invention have been shown and described, it will be understood that the above embodiments are exemplary. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments of the present invention without departing from the spirit and principles of the invention.
Claims (4)
- The FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier stud consists of a composite pipe and gangue concrete, and is characterized in that: the composite pipe is composed of a steel wire mesh skeleton plastic composite pipe and an FRP pipe arranged in the composite pipe, the steel wire mesh skeleton of the steel wire mesh skeleton plastic composite pipe is formed by welding high-strength steel wires, and the external plastic is engineering plastic with flame-retardant and antistatic properties; the FRP pipe arranged in the steel wire mesh skeleton plastic composite pipe is a finished FRP pipe prepared by winding or pulling and winding technology, fibers forming the FRP pipe are mainly arranged transversely, the volume ratio of the transverse fibers is not lower than 70%, the steel wire mesh skeleton plastic composite pipe and the FRP pipe are made of external constraint materials, and coal gangue concrete is used as an internal filling material.
- 2. The FRP-steel wire mesh skeleton plastic composite pipe-restrained gangue concrete pier column of claim 1, wherein: the FRP pipe is placed inside the steel wire mesh skeleton plastic composite pipe.
- 3. The FRP-steel wire mesh skeleton plastic composite pipe-restrained gangue concrete pier column of claim 1, wherein: the particle size of the coal gangue crushed underground by adopting a jaw crusher is between 10 and 60 millimeters.
- 4. A construction method for realizing the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column according to any one of claims 1 to 3, which is characterized by comprising the following steps:firstly, cutting an FRP pipe and a steel wire mesh skeleton plastic composite pipe into a length required by design on the ground;uniformly stirring the fly ash, the blast furnace ash, the waste gypsum and the quick lime according to a designed proportion, sealing, and transporting to a specified underground position;thirdly, placing the FRP pipe conveyed underground into a steel wire mesh skeleton plastic composite pipe, and fixing the two pipes at the upper end and the lower end according to the designed eccentricity through plastic buckles;erecting the fixed FRP-steel wire mesh skeleton plastic composite pipe along the height direction of the roadway, and adopting a single hydraulic prop to temporarily support the roadway top plate around the fixed FRP-steel wire mesh skeleton plastic composite pipe within two meters;crushing the coal gangue underground by adopting a jaw crusher, and screening out coal gangue blocks with the particle size of 10-60 mm;step six, conveying crushed and screened gangue blocks to the vicinity of the plastic composite pipe with the FRP-steel wire mesh framework through a flat car, and injecting the gangue blocks into the plastic composite pipe with the FRP-steel wire mesh framework through a portable belt conveyor;step seven, stirring the mine water which does not contain macroscopic solid impurities after precipitation and filtration and the mixed powdery cementing material consisting of fly ash, blast furnace slag, waste gypsum and quicklime according to a designed proportion;step eight, injecting the slurry after stirring and mixing into the FRP-steel wire mesh skeleton plastic composite pipe filled with the gangue blocks through a grouting pump until the FRP-steel wire mesh skeleton plastic composite pipe is completely filled with the gangue blocks;step nine, placing a rubber capsule with grouting holes and exhaust holes above the FRP-steel wire mesh skeleton plastic composite pipe, and injecting slurry into the rubber capsule through the grouting holes to realize complete contact between the FRP-steel wire mesh skeleton plastic composite pipe and the roadway roof;step ten, sequentially filling FRP-steel wire mesh skeleton plastic composite pipes filled with gangue blocks until all the composite pipes are full, and completing a working cycle;and step eleven, after the filling work is finished for 7 days, removing the single hydraulic prop erected around the FRP-steel wire mesh skeleton plastic composite pipe restraining gangue concrete pier column.
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