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CN-122014150-A - Grouting and pressure-feeding method and mine shaft construction method applying same

CN122014150ACN 122014150 ACN122014150 ACN 122014150ACN-122014150-A

Abstract

The invention discloses a grouting and pressure-feeding method and a mine shaft construction method applying the same, and belongs to the technical field of mine shaft construction. The grouting and pressure-feeding method comprises the core steps of grouting preparation, sectional pressure-feeding grouting, pressure-feeding control and secondary slurry-supplementing pressure-feeding, and solves the technical defects that in the grouting and pressure-feeding process, tiny backflow of slurry is easy to ignore, solidification is not compact, a grouting channel is easy to block and efficiency is low in the prior art by limiting a single-liquid slurry pressure-feeding pressure interval and a double-liquid slurry pressure-feeding pressure interval and optimizing a shutdown rhythm in a pressure stabilizing stage. The mine shaft construction flow adopting the method adapts to complex surrounding rock conditions such as strong wind, rich water and the like, and finally achieves the technical effects of accurately pressing and delivering slurry, inhibiting backflow and improving consolidation compactness, effectively ensures the safety and efficiency of mine shaft construction, and can be widely adapted to complex grouting reinforcement engineering scenes of various mine shafts.

Inventors

  • ZHENG MINGCHA
  • GAO WANSHAN
  • Hui Doubao
  • Fu Baojiang
  • MA HUAJUN

Assignees

  • 湖南涟邵建设工程(集团)有限责任公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (10)

  1. 1. The grouting pressure-feeding method is characterized by comprising the following steps of: (1) Grouting preparation, namely, adopting a grouting pipe with a hole as a pressing and conveying channel, driving the grouting pipe into a preset drilling hole, and welding the grouting pipe into an integral structure through annular steel bars; (2) The sectional pressure grouting adopts a sectional pressure grouting mode of single-liquid grouting and double-liquid grouting, firstly, cement single-liquid grouting is pressed into a grouting pipe, and then cement-water glass double-liquid grouting is pressed into the grouting pipe; (3) The pressure-feeding control, namely controlling grouting pressure in the pressure-feeding process, wherein the single-fluid grouting pressure of cement is controlled to be 5-6MPa, the double-fluid grouting pressure is controlled to be 6-8MPa, the pressure stabilizing time after the double-fluid grouting is controlled to be not less than 5min, and the end of the pressure-feeding is judged by adopting a final pressure and grouting quantity double control standard; (4) And (3) secondary slurry supplementing and pressure delivering, namely when the surrounding rock consolidation after grouting does not meet the design requirement, the original grouting pipe is used, and the grouting pressure is controlled to be more than or equal to 5MPa.
  2. 2. The grouting and pressing method according to claim 1, wherein in the step (1), a plurality of phi 10mm holes are uniformly distributed in a range of 100mm at one end of the grouting pipe, an inner conical surface groove is processed at the inner end of each hole, an aluminum foil with a folded edge and a score line is embedded in the inner conical surface groove, and the aluminum foil is fixed through welding spots.
  3. 3. The grouting pumping method according to claim 2, wherein the taper of the inner conical surface groove is 20 degrees, the length is 3mm, the large end hole diameter phi is 13mm, the small end hole diameter phi is 10mm, and the conical surface roughness Ra is less than or equal to 1.6 μm.
  4. 4. The grouting pressing method according to claim 2, wherein the thickness of the aluminum foil is 0.12-0.18mm, the diameter phi is 12mm, the center is provided with a cross-shaped notch line, the notch depth is 2/3 of the thickness of the aluminum foil, and the notch length is 4mm.
  5. 5. The grouting pressing method according to claim 4, wherein 3 folds are uniformly arranged on the periphery of the aluminum foil, the folds and the aluminum foil are integrally formed by stamping, the inclination angle is 30 degrees, the height is 0.2mm, and the folds face the inside of the grouting pipe.
  6. 6. The grouting pressing method according to claim 4, wherein the aluminum foil comprises three specifications, respectively: specification A is 0.12mm thick plus shallow nick, and the punching pressure is 2MPa; 0.15mm thick + medium score, 3MPa of punching pressure; Specification C0.18 mm thick + deep score, 4MPa of punching pressure.
  7. 7. The grouting pressing method according to claim 2, wherein the aluminum foil is fixed by 2 welding spots, and the welding spots are positioned at the outer sides of the folds.
  8. 8. The grouting pumping method according to claim 1, wherein the ratio of the cement single slurry in the step (2) is cement: water=1:0.5, and the ratio of the double slurry is cement: water glass=0.5:1:0.5.
  9. 9. The grouting pressure feeding method according to claim 1, wherein the grouting pressure feeding in the step (2) adopts a hole-separating pouring mode.
  10. 10. A mine shaft construction method applying the grouting and pressure feeding method according to any one of claims 1 to 9, characterized by comprising the steps of: (1) The preliminary preparation comprises cleaning the working surface of a vertical shaft, leveling, arranging a temporary water pit and a water pump in the center of the shaft for drainage, projecting the drilling position to a bottom plate according to the design, debugging a down-the-hole drill and checking the integrity of the drill; (2) Drilling deep holes, namely drilling rock according to the design angle, azimuth and depth, wherein the drilling angle error is less than or equal to +/-0.5 degrees, drilling adopts a low-impact low-propulsion mode, adjusting propulsion pressure along with the drilling depth, correcting deflection in real time by using an inclinometer, cleaning sand and stones in the holes after hole forming, and plugging a pipe orifice; (3) Grouting pipe installation and grouting pressure feeding, namely completing grouting pipe installation and grouting pressure feeding operation by adopting the grouting pressure feeding method according to any one of claims 1-9; (4) Monitoring slurry diffusion and stratum deformation in the construction process, checking the consolidation condition of surrounding rock after grouting, excavating a shaft by adopting weak blasting and a small excavator after reaching standards, and binding steel bars, installing templates and pouring concrete after checking to be qualified.

Description

Grouting and pressure-feeding method and mine shaft construction method applying same Technical Field The invention relates to the technical field of mine shaft construction, in particular to a grouting and pressure-feeding method and a mine shaft construction method applying the same. Background In the construction process of the mine shaft, when complex surrounding rock conditions such as strong weathering, water enrichment and the like are encountered, the problems of well wall collapse, water burst and the like are extremely easy to occur, and the construction safety and the progress are seriously influenced. Grouting reinforcement is a core technical means for solving the problems, and is characterized in that slurry is accurately conveyed into surrounding rock cracks through a grouting pipe in a pressing mode, surrounding rock consolidation is achieved, and the bearing capacity of the surrounding rock is improved. In the existing grouting pressure-feeding method, a fixed pressure-feeding mode is mostly adopted, and in the double-slurry pressure-stabilizing stage, the pressure-stabilizing pressure is always kept continuously, so that the tiny backflow phenomenon of slurry due to the action of gravity is ignored. The backflow phenomenon is very easy to ignore in actual construction due to tiny backflow amount and no obvious visual expression, but the long-term accumulation can lead to the occurrence of gaps in tiny cracks of surrounding rock, so that solidification is not compact, further the grouting reinforcement effect is affected, and potential safety hazards of later deformation and collapse of a buried well wall are avoided. Meanwhile, in the existing grouting and pressure feeding process, the hole of a grouting pipe is easy to be blocked by slurry deposition to influence the slurry diffusion efficiency, grouting parameters are not accurately controlled enough, surrounding rock conditions with different crack openings are difficult to adapt, and slurry is wasted or insufficiently filled. In addition, the existing grouting and pressure-feeding method is not enough in suitability with the construction flow of the mine shaft, a complete integrated construction scheme cannot be formed, and the construction efficiency is low. Therefore, there is a need for a grouting and pressing method which can solve the above-mentioned hidden problem, enhance grouting effect, and adapt to the construction scene of the mine shaft, and a construction method of the mine shaft using the method. Disclosure of Invention The invention aims to provide a grouting pressure-feeding method and a mine shaft construction method applying the pressure-feeding method, so that accurate pressure-feeding of slurry is realized, backflow is inhibited, and solidification quality is improved. The technical aim of the invention is realized by the following technical scheme: A grouting pressure-feed method comprises the following steps: (1) Grouting preparation, namely, adopting a grouting pipe with a hole as a pressing and conveying channel, driving the grouting pipe into a preset drilling hole, and welding the grouting pipe into an integral structure through annular steel bars; (2) The sectional pressure grouting adopts a sectional pressure grouting mode of single-liquid grouting and double-liquid grouting, firstly, cement single-liquid grouting is pressed into a grouting pipe, then cement-water glass double-liquid grouting is pressed into the grouting pipe, and aluminum foil is regularly broken along a score line by controlling grouting pressure, so that accurate pressure grouting of the grouting into surrounding rock cracks is realized; (3) The pressure-feeding control, namely controlling grouting pressure in the pressure-feeding process, wherein the single-fluid grouting pressure of cement is controlled to be 5-6MPa, the double-fluid grouting pressure is controlled to be 6-8MPa, the pressure stabilizing time after double-fluid grouting is not less than 5min, and the end of the pressure-feeding is judged by adopting a double control standard of final pressure and grouting amount; (4) And (3) secondary grouting and pressure conveying, namely when the surrounding rock consolidation after grouting does not meet the design requirement, an original grouting pipe is used, an aluminum foil with corresponding specification is selected according to geological conditions to adapt the grouting pressure, the grouting pressure is controlled to be more than or equal to 5MPa, and aluminum foil fragments and residual slurry are jacked up for grouting and pressure conveying. In a preferred embodiment, in the step (1), a plurality of 10 mm-diameter holes are uniformly distributed within a range of 100mm at one end of the grouting pipe, an inner conical surface groove is processed at the inner end of each hole, an aluminum foil with a folded edge and a score line is embedded in the inner conical surface groove, and the aluminum foil is fixed through weldin