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CN-121993248-A - Method for depressurizing high-drop underground filling pipeline

CN121993248ACN 121993248 ACN121993248 ACN 121993248ACN-121993248-A

Abstract

The invention discloses a method for decompressing a high-drop underground filling pipeline, which comprises the following steps of S1, pipeline replacement, S2, turning decompression connection, wherein a ceramic elbow and an anti-blocking decompression device are sequentially connected below the replaced wear-resistant ceramic pipe, the turning buffering of the slurry flowing direction is realized through the ceramic elbow, the ceramic elbow is coaxially butted with the vertically arranged wear-resistant ceramic pipe, the inner wall of the ceramic elbow adopts smooth wear-resistant treatment, and S3, anti-blocking decompression integration is carried out, and the outlet end of the anti-blocking decompression device is hermetically connected with an underground filling main pipeline. The anti-blocking pressure reducing device is additionally arranged, so that slurry flow is changed into dispersed flow, the pressure is evenly released, the impact cutting of slurry on the pipe wall is reduced, the generation of new sheet-shaped falling objects is avoided, and the accumulation of particles caused by high-speed flushing of the slurry in a single channel is avoided.

Inventors

  • WANG LINGHUI
  • ZHANG MINGSHENG
  • WEI YUCHUN
  • WU YONG
  • LI ZHIGANG

Assignees

  • 铜陵有色股份安庆月山矿业有限公司

Dates

Publication Date
20260508
Application Date
20260127

Claims (10)

  1. 1. The method for decompressing the high-drop underground filling pipeline is characterized by comprising the following steps of, S1, pipeline replacement, namely dismantling a worn ceramic pipe at the lower end of a high-head underground filling hole, and replacing the ceramic pipe with a wear-resistant ceramic pipe, wherein the replacement length of the wear-resistant ceramic pipe is 2.5 meters, and the replacement scheme refers to the ceramic pipe installation standard of an copper installation filling site; S2, a direction-changing and pressure-reducing connection step, namely sequentially connecting a ceramic elbow and an anti-blocking and pressure-reducing device below the replaced wear-resistant ceramic pipe, wherein the direction-changing buffering of the slurry flow direction is realized through the ceramic elbow, the ceramic elbow is coaxially butted with the vertically arranged wear-resistant ceramic pipe, and the inner wall of the ceramic elbow is subjected to smooth wear-resistant treatment; and S3, an anti-blocking pressure relief integration step, namely, the outlet end of the anti-blocking pressure relief device is connected with the underground filling main pipeline in a sealing way, and the anti-blocking pressure relief device is linked with the slurry pressure in the filling pipeline to realize the automatic overpressure relief.
  2. 2. The method for depressurizing a high-head underground filling pipe according to claim 1, wherein in S1, the replaced abrasion-resistant ceramic pipe is made of high-aluminum abrasion-resistant ceramic, the hardness of the abrasion-resistant ceramic pipe is equal to or more than HRA85, the impact strength of the abrasion-resistant ceramic pipe is equal to or more than 12J/cm < 2 >, the inner diameter of the abrasion-resistant ceramic pipe is identical to the inner diameter of the original filling pipe, and the smooth flow of slurry is ensured.
  3. 3. The method for reducing pressure of a high-head underground filling pipeline according to claim 1, wherein in the step S2, the bending angle of the ceramic elbow is 90 degrees, the ceramic elbow is made of the same material as the replaced wear-resistant ceramic pipe, the ceramic elbow is connected with the wear-resistant ceramic pipe and the anti-blocking pressure reducing device in a flange sealing mode, and a wear-resistant sealing gasket is arranged on the contact surface of the flange.
  4. 4. The method for depressurizing a high drop well filling pipe as claimed in claim 1, wherein in S2, the inner wall of the ceramic elbow is provided with a polishing layer, and the surface roughness Ra of the polishing layer is less than or equal to 0.8 μm, so that the slurry flow resistance and the abrasion to the inner wall of the elbow are reduced.
  5. 5. The method for reducing the pressure of the high-head underground filling pipeline according to claim 1, wherein the anti-blocking pressure reducing device comprises an outer pipe (1), an inner pipe (2) with liquid outlet holes (3) densely distributed at the upper end and an automatic pressure relief valve body (5) arranged on the outer pipe (1); the inner tube (2) is positioned in the inner cavity of the outer tube (1), two ends of the upper outer tube (1) are sealed by flanges, the inner tube (2) penetrates through the outer tube (1), and a buffer cavity (4) is arranged between the outer wall of the inner tube (2) and the inner wall of the outer tube (1); the automatic pressure relief valve body (5) comprises a valve body, a convex blocking part (6), a valve cover (7), a collision ring (11) and a blocking head (9); The convex blocking part (6) is arranged in the inner cavity of the valve body; The interference ring (11) is positioned at the periphery of the convex blocking part (6); The inner cavity of the valve cover (7) is provided with a telescopic rod (8), the lower end of the telescopic rod (8) is fixedly connected with the blocking head (9), the periphery of the blocking head (9) is provided with an elastic pad (10), and the outer wall of the elastic pad (10) and the inner wall of the valve cover (7) slide and hang down; The automatic pressure relief valve is characterized by further comprising an automatic cleaning unit, and the upper end of the interference ring (11) can be automatically cleaned after the automatic pressure relief valve body (5) is subjected to pressure relief every time.
  6. 6. The method for depressurizing a high-head underground filling pipe according to claim 2, wherein the automatic cleaning unit comprises a jack-up spring (18) and a movable column (20) which are arranged in the inner cavity of the convex blocking part (6), a driving rod (15) which is arranged at the lower end of the blocking head (9) and a scraping plate (13); The upper end of the jacking spring (18) is fixedly connected with a rotary bottom plate (19), the upper end of the rotary bottom plate (19) is rotationally connected with the lower end of the movable column (20), the lower end of the jacking spring (18) is fixedly connected with the bottom of the inner cavity of the convex blocking part (6), a sliding block (22) is fixed on the outer wall of the rotary bottom plate (19), and the sliding block (22) is slidably arranged in a limiting groove arranged on the inner wall of the convex blocking part (6); The inner cavity of the movable column (20) is provided with a spiral groove (17); The lower end of the driving rod (15) is positioned in the inner cavity of the movable column (20), the lower end of the driving rod (15) is provided with a contact resisting rod (21), and the contact resisting rod (21) is positioned in the inner cavity of the spiral groove (17); The scraping plate (13) is arranged in a notch cavity on the abutting ring (11), a connecting rod (14) is fixed at the side end of the scraping plate (13), one end, far away from the abutting ring (11), of the connecting rod (14) penetrates through a notch arranged on the outer wall of the protruding blocking part (6) to be fixedly connected with the movable column (20), and the lower end of the scraping plate (13) is matched with the upper end of the abutting ring (11); A first magnet (12) is arranged in a groove at the upper end of the abutting ring (11).
  7. 7. Method for depressurizing a high head downhole filling pipe according to claim 6, characterized in that a positioning unit is also provided for locking the swivel floor (19) before the plugging head (9) moves downwards.
  8. 8. The method for depressurizing a high-head downhole filling pipe according to claim 7, wherein the positioning unit comprises a positioning block (23) slidably arranged in an inner cavity of the rotary bottom plate (19), and an extrusion rod (28) fixedly arranged at a lower end axis of the driving rod (15); A positioning hole (27) which is matched with the positioning end of the positioning block (23) is formed in the inner wall of the movable column (20); The left end of the positioning block (23) is fixedly connected with a baffle plate (25) fixed in the inner cavity of the rotary bottom plate (19) through a positioning spring (24), a rod body (26) is fixed at the left end of the positioning block (23), and the left end of the rod body (26) penetrates through the baffle plate (25) and is fixedly connected with a triangular guide block; The lower end of the extrusion rod (28) penetrates through the movable column (20) and extends to the inner cavity of the rotary bottom plate (19) to be connected with the universal ball.
  9. 9. The method for depressurizing a high drop underground filling pipe according to claim 6, wherein a tight collision unit is further provided for controlling the lower end of the scraper (13) to tightly collide with the upper end of the collision ring (11); The compact collision unit comprises a buffer spring (32) and a sliding column (31), the sliding column (31) is installed in an inner cavity of the scraping plate (13), the lower end of the sliding column (31) penetrates through the connecting rod (14) in a sliding mode, the sliding column (31) is of a square structure, the connecting rod (14) is movably arranged on the sliding column (31), the buffer spring (32) is sleeved on the periphery of the sliding column (31), and the upper end and the lower end of the buffer spring (32) are fixedly connected with the scraping plate (13) and the connecting rod (14) respectively; the upper end and the lower end of the scraping plate (13) are respectively provided with a scraping tip (16) with an isosceles triangle structure.
  10. 10. The method for depressurizing a high-head underground filling pipeline according to claim 6, wherein a second magnet (29) is arranged at the top of the inner cavity of the valve cover (7), and an adsorption block (30) matched with the second magnet (29) is arranged at the upper end of the blocking head (9).

Description

Method for depressurizing high-drop underground filling pipeline Technical Field The invention relates to the technical field of mine filling engineering, in particular to a method for decompressing a high-drop underground filling pipeline. Background The Gao Lacha underground filling technology is one of key technologies for realizing efficient utilization of resources and environmental protection in the mining process, is widely applied to goaf filling operation after deep mining resources are mined, and is characterized in that slurry is accurately conveyed to a target goaf through a filling pipeline, so that surrounding rock stability control and earth surface subsidence prevention and control are realized. However, under the working condition of high drop (the normal drop exceeds 300 m), the problems of high slurry impact strength, concentrated pressure, high abrasiveness and the like of the filling pipeline are particularly remarkable, and the existing high drop underground filling pipeline pressure reducing system has a plurality of technical defects, so that the stability, safety and economy of filling operation are seriously restricted; In the prior art, the underground filling pipeline is decompressed by adopting a simple decompression bin or a single partition plate structure, and a special anti-blocking decompression device is not arranged, so that the impact force of high-flow-rate slurry cannot be effectively buffered and dispersed, and the pressure is enabled to act on the decompression bin end plate and the partition plate in a concentrated manner, so that the decompression bin end plate is seriously deformed, and the replacement frequency is increased; therefore, a method for decompressing the high-drop underground filling pipeline is designed to solve the problems. Disclosure of Invention The application aims to provide a method for decompressing a high-drop underground filling pipeline, which is used for solving the technical problems in the background. In order to achieve the aim, the application provides the following technical scheme that the method for decompressing the high-drop underground filling pipeline comprises the following steps, S1, pipeline replacement, namely dismantling a worn ceramic pipe at the lower end of a high-head underground filling hole, and replacing the ceramic pipe with a wear-resistant ceramic pipe, wherein the replacement length of the wear-resistant ceramic pipe is 2.5 meters, and the replacement scheme refers to the ceramic pipe installation standard of an copper installation filling site; S2, a direction-changing and pressure-reducing connection step, namely sequentially connecting a ceramic elbow and an anti-blocking and pressure-reducing device below the replaced wear-resistant ceramic pipe, wherein the direction-changing buffering of the slurry flow direction is realized through the ceramic elbow, the ceramic elbow is coaxially butted with the vertically arranged wear-resistant ceramic pipe, and the inner wall of the ceramic elbow is subjected to smooth wear-resistant treatment; and S3, an anti-blocking pressure relief integration step, namely, the outlet end of the anti-blocking pressure relief device is connected with the underground filling main pipeline in a sealing way, and the anti-blocking pressure relief device is linked with the slurry pressure in the filling pipeline to realize the automatic overpressure relief. As a preferred implementation manner in the embodiment, in S1, the replaced wear-resistant ceramic tube is made of high-aluminum wear-resistant ceramic, the hardness is more than or equal to HRA85, the impact strength is more than or equal to 12J/cm < 2 >, and the inner diameter of the wear-resistant ceramic tube is consistent with the inner diameter of the original filling pipeline, so that smooth slurry flow is ensured. In S2, the bending angle of the ceramic elbow is 90 °, the material of the ceramic elbow is the same as that of the replaced wear-resistant ceramic tube, the ceramic elbow is connected with the wear-resistant ceramic tube and the anti-blocking pressure reducer in a flange sealing manner, and a wear-resistant sealing gasket is arranged on the contact surface of the flange. As a preferred implementation manner in the embodiment, in S2, the inner wall of the ceramic elbow is provided with a polishing layer, and the surface roughness Ra of the polishing layer is less than or equal to 0.8 mu m, so that the slurry flow resistance and the abrasion to the inner wall of the elbow are reduced. As a preferred implementation manner in this embodiment, the anti-blocking pressure reducing device includes an outer tube, an inner tube with liquid outlet holes densely distributed at the upper end, and an automatic pressure relief valve body mounted on the outer tube; The inner pipe is positioned in the inner cavity of the outer pipe, two ends of the upper outer pipe are sealed by flanges, the inner pipe penetrates through the outer p