Drill casing water outlet reinforcement device and method

Abstract

The present invention relates to a borehole casing water outlet reinforcement device and method. In order to overcome the defects of the prior art, the borehole casing water outlet reinforcement device of the present invention comprises a grouting pipe, and a plurality of grouting holes are opened on the side wall of the middle section of the grouting pipe, and is characterized in that: a drainage pipe is also penetrated inside the grouting pipe, and the upper and lower grouting ports and the drainage pipe are respectively closed by a conical tube or annular sealing plate, and two outer convex rings are fixedly connected to the upper part of the grouting pipe, and an expandable sealing sleeve is arranged between the two outer convex rings, and the axial center line of the grouting pipe coincides with the axial center line of the drainage pipe, and both are divided into multiple sections, and the adjacent upper and lower sections are respectively connected by sealing pipe threads. The present invention also relates to a corresponding borehole water outlet reinforcement method. The present borehole casing water outlet reinforcement device has a simple structure and is easy to use, and is suitable for rapid grouting reinforcement and plugging of water-inrushing boreholes.

Description

Technical Field

[0001] The invention relates to a drilling casing water outlet reinforcement device and method. Background Art

[0002] At present, in the construction process of building highways, subways and other tunnels or mining drilling, when facing the strata containing pressurized water, the method of advanced grouting and sealing is often used to deal with it. First, drilling is carried out to form a hole, and then the grouting pipe is placed for grouting. Due to the pressure-bearing nature of groundwater and the need to manually seal the grouting hole when drilling the hole, when drilling to the pressurized water layer, it is not possible to stop the leak in time, resulting in sudden surges, causing safety accidents and affecting the construction quality. In terms of sealing, domestic and foreign scholars have studied chemical automated sealing devices for sealing, but the reaction time is too long, the effect is unstable, and it is not obvious. Therefore, the prior art urgently needs a borehole casing water outlet reinforcement device and method. Summary of the invention

[0003] The technical problem to be solved by the present invention is how to overcome the above-mentioned defects of the prior art and provide a drilling casing water outlet reinforcement device and method.

[0004] In order to solve the above technical problems, the present invention provides a drilling casing water outlet reinforcement device and method. The drilling casing water outlet reinforcement device comprises a grouting pipe, a plurality of grouting holes are opened on the side wall of the middle section of the grouting pipe, and is characterized in that: a drainage pipe is also penetrated inside the grouting pipe, and the upper and lower grouting ports and the drainage pipe are respectively closed by a conical tube-shaped sealing plate or an annular sealing plate, and the upper part of the grouting pipe is fixedly connected to two outer convex rings, and an expandable sealing sleeve is arranged between the two outer convex rings, and the expandable sealing sleeve is respectively provided with inward flanges on the upper and lower edges, and an annular pressure plate is respectively provided on the inner side of the flange, and relative axial through holes are respectively opened on the two outer convex rings and the annular pressure plate, and each relative axial through hole is respectively penetrated by a fixing bolt, and after the fixing bolt passes through the flange, the annular pressure plate, the flange and the outer convex ring are tightly fixed together, and a slurry inlet pipe is provided at the bottom of the grouting pipe, and the slurry A sealing rubber sleeve is provided above the inlet pipe, and the grouting holes are evenly and densely distributed on the side wall of the grouting pipe between the outer convex ring on the top of the grouting pipe and the sealing rubber sleeve. The outer diameter of the two outer convex rings is ≤ the inner diameter of the borehole to be reinforced. The sealing rubber sleeve can be inserted into the lower mouth of the borehole to be reinforced together with the grouting pipe, and the outer surface of the sealing rubber sleeve is water-sealed with the inner wall of the lower mouth of the borehole to be reinforced. When the slurry inlet pipe is grouted, the expandable sealing sleeve is compressed and expanded, and its outer circumferential surface is water-sealed with the inner wall of the borehole to be reinforced. The axial center line of the grouting pipe coincides with the axial center line of the drainage pipe, and the two are divided into multiple sections. The adjacent upper and lower sections are respectively connected by threads, and the two have the same pitch. The top section grouting pipe and the top section drainage pipe are welded together by a conical tube-shaped sealing plate, and the bottom section grouting pipe and the bottom section drainage pipe are also welded together by a conical tube-shaped sealing plate, and the intermediate sections of the grouting pipe and the drainage pipe are separated from each other.

[0005] With this design, during the grouting reinforcement process, most of the water gushing out of the borehole is led out through the drainage pipe, and the amount of water passing through the gap between the grouting pipe and the borehole is greatly reduced, reducing the scouring of the slurry by the running water and making the slurry easier to solidify.

[0006] As an optimization, a valve is provided at the lower end of the drainage pipe, and the length of the grouting pipe is ≤ the length of the borehole to be reinforced extending in the waterproof layer of the roof. With such a design, after the grouting solidifies, the water discharge from the borehole can be stopped by closing the valve at the lower end of the drainage pipe, which is very convenient.

[0007] As an optimization, the side wall thickness of the grouting pipe is 8 mm, and the length of the grouting pipe is ≥ 24.2 m. With such a design, practice has proved that the above wall thickness and length have a good grouting reinforcement effect.

[0008] As an optimization, it also includes a plurality of matching sealing rubber sleeves, which can be sleeved on the bottom section grouting pipe above the sealing rubber sleeve as needed, and seal the redundant grouting holes on the bottom section grouting pipe that cannot enter the drill hole. With such a design, the present invention can roughly adjust the length of the grouting pipe and the drainage pipe by controlling the number of the intermediate section drainage pipe and the intermediate section grouting pipe during use.

[0009] The drilling water reinforcement method of the present invention comprises the following steps:

[0010] ①. Take out the drill rod and drill bit in the drill hole to be reinforced where water burst occurs;

[0011] ②. Take the aforementioned top section grouting pipe and drainage pipe and bottom section grouting pipe and drainage pipe, and select an appropriate number of intermediate section grouting pipes and intermediate section drainage pipes according to the total length of the drill pipe when water burst occurs in the borehole, and select an appropriate number of the aforementioned matching sealing rubber sleeves, and roughly adjust the length of the grouting pipe and drainage pipe by controlling the number of intermediate section drainage pipes and intermediate section grouting pipes, and use an appropriate number of sealing rubber sleeves to block the redundant grouting holes above the grouting pipe, so that 24.2m≤the length of the grouting pipe≤the length of the borehole to be reinforced extending in the waterproof layer of the roof;

[0012] ③. Then, insert the top section grouting pipe and the top section drainage pipe from bottom to top into the borehole to be reinforced. When the lower end is about to be inserted into the borehole to be reinforced, screw on the next intermediate section grouting pipe and drainage pipe respectively. Then insert it upward from bottom to top. When the lower end is about to be inserted into the borehole to be reinforced, screw on the next intermediate section grouting pipe and drainage pipe respectively. Repeat this cycle until all the selected intermediate section drainage pipes and intermediate section grouting pipes are screwed on.

[0013] ④. Select all the matching sealing rubber sleeves in step ② and put them on the bottom section grouting pipe in turn, so that the sealing rubber sleeve and all the matching sealing rubber sleeves are squeezed tightly against each other. Then, make sure that the valve at the lower end of the drainage pipe is in the open state, align the bottom section drainage pipe and the bottom section grouting pipe with the lower end of the middle section drainage pipe and the lower end of the middle section grouting pipe in step ③ respectively, and complete the rotation of the entire grouting pipe and drainage pipe.

[0014] ⑤. Insert the bottom section grouting pipe upward into the drill hole to be reinforced, and make the sealing rubber sleeve or the matching sealing rubber sleeve tightly combined with the inner wall of the lower port of the drill hole to be reinforced.

[0015] ⑥. Connect the slurry inlet pipe to the outlet pipe of the grouting machine, and start the grouting machine to inject the reinforcement slurry into the grouting pipe. The reinforcement slurry is squeezed into the gap between the hole wall and the grouting pipe in the waterproof layer of the top plate of the drilled hole to be reinforced and the rock cracks in the waterproof layer of the top plate of the drilled hole to be reinforced through the grouting hole, forcing the expandable sealing sleeve to be tightly combined with the hole wall at the upper end of the waterproof layer of the drilled hole to be reinforced, preventing the water from the aquifer from entering the drilled hole in the waterproof layer, and maintaining the pressure until the reinforcement slurry solidifies, and the drilled hole to be reinforced is completed.

[0016] ⑦. Finally, close the valve at the lower end of the drainage pipe and clean up the accumulated water and mud below.

[0017] The reinforcing slurry is preferably single-liquid cement slurry or cement-water glass two-liquid slurry.

[0018] The drilling casing water outlet reinforcement device has a simple structure and is easy to use, and is suitable for rapid grouting reinforcement and plugging of water inrush drilling holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the partial cross-sectional structure of the borehole casing water outlet reinforcement device of the present invention (the grouting pipe, the outer convex ring, the expandable sealing sleeve and the slurry inlet pipe are cut along the plane passing through the axis center line);

[0020] Figure 2 yes Figure 1 The exploded structural diagram of the borehole casing water outlet reinforcement device of the invention shown in the figure (one section of the intermediate grouting pipe and the intermediate drainage pipe are retained, and the rest are omitted);

[0021] Figure 3 yes Figure 1 The schematic diagram of the structure of the borehole casing water outlet reinforcement device in use state is shown.

[0022] In the figure: 1 is a grouting pipe, 101 is a top section grouting pipe, 102 is a bottom section grouting pipe, 103 is an intermediate section grouting pipe, 2 is a grouting hole, 3 is a drainage pipe, 301 is a top section drainage pipe, 302 is a bottom section drainage pipe, 303 is an intermediate section drainage pipe, 4 is a conical tubular sealing plate, 5 is a valve, 6 is a top plate, 7 is a water-proof layer, 8 is an aquifer, 11 is an outer convex ring, 12 is an expandable sealing sleeve, 121 is a flange, 13 is a ring pressure plate, 14 is a fixing bolt, 15 is a slurry inlet pipe, 16 is a sealing rubber sleeve, D1 is the outer diameter of the outer convex ring 11, and D2 is the inner diameter of the borehole to be reinforced. DETAILED DESCRIPTION

[0023] Implementation method 1: Figure 1-3 As shown, the borehole casing water outlet reinforcement device of the present invention comprises a grouting pipe 1, a plurality of grouting holes 2 are opened on the side wall of the middle section of the grouting pipe 1, and the characteristics are as follows: a drainage pipe 3 is also penetrated inside the grouting pipe 1, and the upper and lower ports of the grouting pipe 1 and the drainage pipe 3 are respectively sealed by a conical tube-shaped sealing plate 4 (of course, a circular ring-shaped sealing plate can also be used to replace the conical tube-shaped sealing plate 4, omitted), and the upper part of the grouting pipe 1 is fixedly connected to two outer convex rings 11, and an expandable sealing sleeve 12 is provided between the two outer convex rings 11. The expandable sealing sleeve 12 is provided between the two outer convex rings 11. The sealing sleeve 12 is provided with inward flanges 121 on the upper and lower edges, and a ring pressure plate 13 is provided inside the flanges 121. Relative axial through holes are respectively opened on the two outer convex rings 11 and the ring pressure plate 13. A fixing bolt 14 is respectively penetrated in each relative axial through hole. After the fixing bolt 14 passes through the flanges 121, the ring pressure plate 13, the flanges 121, and the outer convex ring 11 are tightly fixed together. A slurry inlet pipe 15 is provided at the bottom of the grouting pipe 1, and a sealing rubber is provided above the slurry inlet pipe 15. The grouting holes 2 are evenly and densely distributed on the side wall of the grouting pipe 1 between the outer convex ring 11 at the top of the grouting pipe 1 and the sealing rubber sleeve 16. The outer diameter D1 of the two outer convex rings 11 is less than the inner diameter D2 of the borehole to be reinforced. The sealing rubber sleeve 16 can be inserted into the lower opening of the borehole to be reinforced along with the grouting pipe 1, and the outer surface of the sealing rubber sleeve 16 is water-tight with the inner wall of the lower opening of the borehole to be reinforced. When the slurry inlet pipe 15 is grouting, the expandable sealing sleeve 12 is compressed and expanded, and its outer circumferential surface is in contact with the borehole to be reinforced. The inner wall of the borehole is water-tight, the axis of the grouting pipe 1 coincides with the axis of the drainage pipe 3, and both are divided into multiple sections. The adjacent upper and lower sections are connected by threads (preferably sealing pipe threads with good sealing performance), and the pitch of the two is the same. The top section grouting pipe 101 and the top section drainage pipe 301 are welded together through a conical tube-shaped sealing plate 4, and the bottom section grouting pipe 102 and the bottom section drainage pipe 302 are also welded together through a conical tube-shaped sealing plate 4. Each intermediate section grouting pipe 103 and each intermediate section drainage pipe 303 are separated from each other. A valve 5 is provided at the lower end of the drainage pipe 3, and the length of the grouting pipe 1 is ≤ the length of the borehole to be reinforced extending in the waterproof layer 7 of the top plate 6. The side wall thickness of the grouting pipe 1 is 8mm, and the length of the grouting pipe is ≥24.2m.

[0024] It also includes a plurality of matching sealing rubber sleeves (the matching sealing rubber sleeves have the same structure as the sealing rubber sleeves 16, not shown in the figure). The matching sealing rubber sleeves can be put on the bottom section 102 grouting pipe 1 above the sealing rubber sleeve 16 as needed, and close the redundant grouting holes 2 on the bottom section grouting pipe 1 that cannot enter the drilling hole.

[0025] The drilling water reinforcement method of the present invention comprises the following steps:

[0026] ①. Remove the drill rod and drill bit (not shown in the figure) from the drill hole to be reinforced where water burst occurs;

[0027] ②. Take the aforementioned top section grouting pipe 101 and top section drainage pipe 301 and the bottom section grouting pipe 102 and top section drainage pipe 301, and select the appropriate number of intermediate section grouting pipes 103 and intermediate section drainage pipes 303 according to the total length of the drill pipe when water burst occurs in the borehole, and select the appropriate number of the aforementioned matching sealing rubber sleeves, by controlling the number of intermediate section drainage pipes 303 and intermediate section grouting pipes 103, the length of the grouting pipe 1 and the drainage pipe 3 is roughly adjusted, and the excess grouting holes 2 above the grouting pipe are blocked with an appropriate number of sealing rubber sleeves, so that 24.2m≤the length of the grouting pipe 1≤the length of the borehole to be reinforced extending in the waterproof layer 7 of the top plate 6;

[0028] ③. Then, first insert the top section grouting pipe 101 and the top section drainage pipe 301 from bottom to top into the borehole to be reinforced, and when the lower end is about to be inserted into the borehole to be reinforced, respectively screw on the next intermediate section grouting pipe 103 and the next intermediate section drainage pipe 303, and then insert it upward from bottom to top, and when the lower end is about to be inserted into the borehole to be reinforced, respectively screw on the next intermediate section grouting pipe 103 and the next intermediate section drainage pipe 303, and repeat this cycle until all the selected intermediate section drainage pipes 303 and intermediate section grouting pipes 103 are screwed on.

[0029] ④. Select all the matching sealing rubber sleeves in step ② and put them on the bottom section grouting pipe 102 in sequence, so that the sealing rubber sleeve 16 and all the matching sealing rubber sleeves are squeezed tightly against each other, and then, make sure that the valve 5 at the lower end of the drainage pipe 3 is in the open state, align the bottom section drainage pipe 302 and the bottom section grouting pipe 102 with the lower end of the middle section drainage pipe 303 and the lower end of the middle section grouting pipe 103 in step ③, respectively, to complete the rotation of the entire grouting pipe 1 and the drainage pipe 3,

[0030] ⑤. Insert the bottom section grouting pipe 102 upward into the borehole to be reinforced, and make the sealing rubber sleeve 16 or the matching sealing rubber sleeve tightly combined with the inner wall of the lower port of the borehole to be reinforced,

[0031] ⑥. Connect the slurry inlet pipe 15 to the outlet pipe of the grouting machine (not shown in the figure), and start the grouting machine to inject the reinforcement slurry into the grouting pipe 1. The reinforcement slurry is squeezed into the gap between the hole wall and the grouting pipe in the waterproof layer 7 of the top plate 6 of the drill hole to be reinforced and the rock cracks in the waterproof layer 7 of the drill hole to be reinforced in the top plate 6 through the grouting hole 2, forcing the expandable sealing sleeve to be tightly combined with the hole wall of the drill hole to be reinforced at the upper end of the waterproof layer 7 to prevent water from the aquifer 8 from entering the drill hole in the waterproof layer 7, and maintain the pressure until the reinforcement slurry solidifies, and the drill hole to be reinforced is reinforced.

[0032] ⑦. Finally, close the valve 5 at the lower end of the drainage pipe 3 and clean up the accumulated water and mud below.

Claims

1. A method for reinforcing a borehole with water discharge, characterized in that: The drilling water reinforcement device comprises a grouting pipe, and a plurality of grouting holes are opened on the side wall of the middle section of the grouting pipe, and is characterized in that: a drainage pipe is also penetrated inside the grouting pipe, and the grouting upper and lower ports and the drainage pipe are respectively closed by a conical tubular sealing plate or an annular sealing plate, and the upper part of the grouting pipe is fixedly connected to the upper part of the grouting pipe, and an expandable sealing sleeve is arranged between the two outer convex rings, and the expandable sealing sleeve is respectively provided with inward flanges on the upper and lower edges, and an annular pressure plate is respectively provided on the inner side of the flange, and the two outer convex rings and the annular pressure plate respectively have relative axial through holes, and each relative axial through hole is respectively penetrated by a fixing bolt, and the fixing bolt passes through the flange to tightly fix the annular pressure plate, the flange and the outer convex ring together, a slurry inlet pipe is provided at the bottom of the grouting pipe, and a sealing rubber sleeve is provided above the slurry inlet pipe, and the grouting holes are evenly and densely distributed on the side wall of the grouting pipe between the outer convex ring at the top of the grouting pipe and the sealing rubber sleeve, and the two outer convex rings The outer diameter is ≤ the inner diameter of the borehole to be reinforced. The sealing rubber sleeve can be inserted into the lower opening of the borehole to be reinforced together with the grouting pipe, and the outer surface of the sealing rubber sleeve is water-tight with the inner wall of the lower opening of the borehole to be reinforced. When the slurry inlet pipe is grouted, the expandable sealing sleeve is compressed and expanded, and its outer circumference is water-tight with the inner wall of the borehole to be reinforced. The axial center line of the grouting pipe coincides with the axial center line of the drainage pipe, and the two are divided into multiple sections. The adjacent upper and lower sections are respectively connected by threads, and the two have the same pitch. The top section grouting pipe and the top section drainage pipe are welded together by a conical tube-shaped sealing plate or an annular sealing plate, and the bottom section grouting pipe and the bottom section drainage pipe are also welded together by a conical tube-shaped sealing plate or an annular sealing plate. The intermediate sections of the grouting pipe and the drainage pipe are separated from each other. It also includes a plurality of matching sealing rubber sleeves. The above-mentioned matching sealing rubber sleeve can be put on the bottom section grouting pipe above the sealing rubber sleeve as needed, and close the redundant grouting holes on the bottom section grouting pipe that cannot enter the borehole. The steps include: ①. Take out the drill rod and drill bit in the drill hole to be reinforced where water burst occurs; ②. Take the top section grouting pipe and the top section drainage pipe and the bottom section grouting pipe and the bottom section drainage pipe, and select the appropriate number of intermediate section grouting pipes and intermediate section drainage pipes according to the total length of the drill pipe when water burst occurs in the borehole, and select the appropriate number of matching sealing rubber sleeves, and roughly adjust the length of the grouting pipe and the drainage pipe by controlling the number of intermediate section drainage pipes and intermediate section grouting pipes, and use the appropriate number of matching sealing rubber sleeves to block the redundant grouting holes above the grouting pipe, so that 24.2m≤the length of the grouting pipe≤the length of the borehole to be reinforced extending in the waterproof layer of the roof; ③. Then, insert the top section grouting pipe and the top section drainage pipe from bottom to top into the borehole to be reinforced. When the lower end is about to be inserted into the borehole to be reinforced, screw the upper and lower intermediate sections of the grouting pipe and drainage pipe respectively. Then insert it upward from bottom to top. When the lower end is about to be inserted into the borehole to be reinforced, screw the upper and lower intermediate sections of the grouting pipe and drainage pipe respectively. Repeat this cycle until all the selected intermediate sections of the drainage pipe and intermediate section grouting pipe are screwed. ④. Select all the matching sealing rubber sleeves in step ② and put them on the bottom section grouting pipe in sequence, so that the sealing rubber sleeve and all the matching sealing rubber sleeves are squeezed tightly against each other, and then, make sure that the valve at the lower end of the drainage pipe is in the open state, align the bottom section drainage pipe and the bottom section grouting pipe with the lower end of the middle section drainage pipe and the lower end of the middle section grouting pipe in step ③ respectively, and complete the rotation of the entire grouting pipe and the drainage pipe; ⑤. Insert the bottom section grouting pipe upward into the drill hole to be reinforced, and make the sealing rubber sleeve or the matching sealing rubber sleeve tightly combined with the inner wall of the lower port of the drill hole to be reinforced; ⑥. Connect the slurry inlet pipe to the outlet pipe of the grouting machine, and start the grouting machine to inject the reinforcement slurry into the grouting pipe. The reinforcement slurry is squeezed into the gap between the hole wall and the grouting pipe in the waterproof layer of the top plate of the drilled hole to be reinforced and the rock cracks in the waterproof layer of the drilled hole to be reinforced in the top plate through the grouting hole, forcing the expandable sealing sleeve to be tightly combined with the hole wall at the upper end of the waterproof layer of the drilled hole to be reinforced, preventing the water of the aquifer from entering the drilled hole in the waterproof layer, and maintaining the pressure until the reinforcement slurry solidifies, and the drilled hole to be reinforced is completed; ⑦. Finally, close the valve at the lower end of the drainage pipe and clean up the accumulated water and mud below.

2. The method for reinforcing a borehole according to claim 1, characterized in that: A valve is provided at the lower end of the drainage pipe, and the length of the grouting pipe is ≤ the length of the borehole to be reinforced extending in the waterproof layer of the top plate.

3. The method for reinforcing a borehole according to claim 1, characterized in that: The side wall thickness of the grouting pipe is 8 mm, and the length of the grouting pipe is ≥ 24.2 m.

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