Post-wall filling and grouting device and method for protecting casing pipe of mine blanking hole

Abstract

The invention discloses a filling and grouting device and method behind the wall of a mine blanking hole protection casing, the protection casing is arranged in a well, a grouting through pipe is arranged on the side wall of the protection casing, the upper end opening of the grouting through pipe extends towards the well mouth of the well, the lower end opening of the grouting through pipe enters an underground roadway, and the lower end opening of the grouting through pipe extends towards the well mouth of the well. More than two segmented grouting pipes are arranged on the side wall of the wall protection sleeve, the upper ports of the more than two segmented grouting pipes are arranged in a staggered mode in the axial position of the side wall of the wall protection sleeve, and the lower ports of the grouting through pipes are sequentially communicated with the lower ports of the different segmented grouting pipes through fluid. Segmented grouting pipes of different heights are welded to the side wall of the wall protection sleeve, the grouting pipes are synchronously installed after the wall protection sleeve is lowered, the grouting depth is not limited and affected by the well depth, the grouting requirements of different depths are met, and high-quality grouting filling can be achieved, especially the deep position of a well.

Description

Technical Field

[0001] The invention relates to the technical field of mine feed hole construction, and more particularly to a device and method for filling grouting behind a casing wall of a mine feed hole. Background Art

[0002] A coal mine feed hole generally refers to a small vertical well connecting the ground feed port and the underground feed chamber. In the early days, after drilling a bare hole in the rock and soil, a protective wall casing (usually a steel pipe) was lowered from the wellhead, and then the protective wall steel casing was grouting-filled to consolidate the protective wall casing with the rock formation to form a feed hole.

[0003] When grouting is performed between the retaining wall casing and the rock formation of the open hole wall, gravity flow method, annular space insertion method or flower-eye casing grouting method is usually adopted; gravity flow method refers to pouring cement slurry from the annular space of the upper wellhead along the outside of the retaining wall casing, and the slurry flows along the retaining wall casing to the lower annular space for filling. This method is only suitable for the situation where the wellbore is shallow and there is no water gushing. In fact, wellbore without water gushing is rare, so it is rare to use gravity flow method for grouting filling alone; annular space insertion method refers to inserting a freely movable grouting pipe directly from the upper wellhead into the annular space for filling, but the insertion depth of the grouting pipe depends on the verticality of the borehole and is uncertain, so this method is generally suitable for wells with gushing. Shallow wellbore of water; the eyelet casing grouting method has more advantages than the annulus insertion method, that is, when the wall casing is installed, an eyelet casing is fixedly installed on its outside. The inner diameter of the eyelet casing is generally twice the outer diameter of the grouting pipe. During grouting filling, the grouting pipe is inserted from the eyelet casing. Due to the protection of the eyelet casing, the insertion depth of the grouting pipe is deeper than the annulus insertion method. However, with the increase of the hole depth, the number of distortions of the borehole space increases, the effective diameter of the borehole in the vertical projection tends to decrease, and the number of distortions of the eyelet grouting casing also increases. This causes the friction resistance to become greater and greater when the grouting pipe is lowered in the later stage, making it difficult to lower it to the designed depth, thereby affecting the filling grouting.

[0004] With the increase of the depth and diameter of the feed hole, the difficulty of grouting filling construction increases sharply. When grouting in deep wells, grouting is required in sections. When the height of a grouting section is too high, the pressure on the outside of the wall casing will be too high, and the wall casing will be squeezed and deformed. It is difficult to achieve precise control of the height of a single filling section in traditional grouting construction. In addition, as the depth increases, it is difficult for the grouting pipe to reach the bottom, and the controllability of the grouting construction becomes lower. It is impossible to control the grouting quality of each section, and it is difficult to meet the actual construction needs. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to provide a device and method for filling and grouting the wall of a mine feed hole protective wall casing, which can accurately control the grouting height of each section, ensure that the protective wall casing is not deformed, and control the quality of each section of filling and grouting.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a grouting device for filling the wall of a mine feed hole with a protective wall casing, the lower port of the shaft is connected to the underground tunnel, the protective wall casing is arranged in the shaft, and an annular space is provided between the protective wall casing and the shaft, a grouting pipe is arranged on the side wall of the protective wall casing, the upper port of the grouting pipe extends toward the wellhead of the shaft, the lower port of the grouting pipe enters the underground tunnel, more than two segmented grouting pipes are arranged on the side wall of the protective wall casing, the lower port of the segmented grouting pipe enters the underground tunnel, the upper ports of the two or more segmented grouting pipes are staggered in axial positions on the side wall of the protective wall casing, and the lower port of the grouting pipe is fluid-connected with the lower ports of different segmented grouting pipes in turn.

[0007] The above-mentioned mine feed hole wall protection casing wall back filling grouting device, the upper ends of the two or more segmented grouting pipes are successively raised in axial position on the side wall of the wall protection casing.

[0008] The above-mentioned mine feed hole wall protection casing wall is filled with grouting device, the lower port of the grouting pipe is fluid-connected with a grouting hose, the grouting hose is fluid-connected with the lower port of the segmented grouting pipe, and the grouting hose and the lower port of the segmented grouting pipe are detachably connected.

[0009] The above-mentioned mine feed hole wall protection casing wall back-filling grouting device, the lower port of the segmented grouting pipe is installed with a valve; the upper port end of the segmented grouting pipe is covered with a sealing cap.

[0010] The above-mentioned mine feed hole wall protection casing wall back filling grouting device, the grouting through pipe is arranged along the length direction of the wall protection casing, the segmented grouting pipe is arranged along the length direction of the wall protection casing, and more than two segmented grouting pipes are distributed along the circumference of the wall protection casing.

[0011] The above-mentioned mine material hole wall protection casing wall back-filling grouting device, a lower wellhead sealing plate is arranged on the bottom of the well hole, the lower wellhead sealing plate is fixedly connected to the top of the underground tunnel, and the lower wellhead sealing plate is sealed and connected to the bottom of the material hole; the lower port of the wall protection casing and the lower port of the segmented grouting pipe pass through the lower wellhead sealing plate.

[0012] The above-mentioned mine feed hole wall protection casing wall back filling grouting device, the ground of the underground tunnel is provided with a support pier, the lower end of the wall protection casing passes through the lower wellhead sealing plate and is supported on the support pier.

[0013] The above-mentioned mine feed hole wall protection casing wall back filling grouting device, the wellhead of the well is fixedly connected with a supporting cross arm, and the wall protection casing passes through the supporting cross arm and is connected to the supporting cross arm.

[0014] The method for filling and grouting the wall of the casing pipe of a mine feeding hole comprises the following steps:

[0015] Step A: Processing the wall protection casing: welding a grouting pipe on the side wall of the wall protection casing, and the grouting pipe is arranged along the length direction of the wall protection casing; then welding 1# segmented grouting pipe, 2# segmented grouting pipe and n# segmented grouting pipe in sequence along the circumferential direction on the side wall of the wall protection casing, the upper ports of the segmented grouting pipes are staggered in axial positions on the side wall of the wall protection casing, and the upper ports of the 1# segmented grouting pipe, the 2# segmented grouting pipe and the n# segmented grouting pipe are successively raised;

[0016] Step B: Installing the wall casing: After the wellbore is drilled, the wall casing is lifted by a lifting device and installed in the wellbore until the lower end of the wall casing enters the underground tunnel and is pressed on the supporting pier in the underground tunnel; the upper end of the grouting pipe is directed toward the hole of the wellbore, the lower end of the grouting pipe enters the underground tunnel, and the lower end of the segmented grouting pipe enters the underground tunnel;

[0017] Step C: Blocking the annular space: Install a lower wellhead blocking plate at the position where the well and the underground tunnel are connected, and use the lower wellhead blocking plate to block the annular space between the lower end of the well and the wall casing; allow the lower end of the wall casing and the lower end of the segmented grouting pipe to pass through the lower wellhead blocking plate and enter the underground tunnel;

[0018] Step D: First high grouting: connect the upper port of the grouting pipe to the grouting pump, connect the grouting hose to the lower port of the grouting pipe, and connect the other end of the grouting pipe to the lower port of the 1# segmented grouting pipe; start the grouting pump, and inject cement slurry into the annular space between the wall casing and the wellbore through the grouting pipe, the grouting hose and the 1# segmented grouting pipe in sequence;

[0019] Step E: When cement slurry flows out of the 2# segmented grouting pipe, turn off the grouting pump, plug the 1# segmented grouting pipe, remove the grouting hose from the lower port of the 1# segmented grouting pipe, and flush the grouting pipe and grouting hose; complete the first section of high grouting;

[0020] Step F: After the first stage of high-pressure grouting is completed, wait for the cement slurry to solidify for 48 hours, and repeat the steps D to E on the basis of the first stage of high-pressure grouting until the nth stage of high-pressure grouting is completed, so that the cement slurry is filled to the wellhead of the shaft, and the annular space filling grouting is completed.

[0021] In the above-mentioned mine feed hole wall casing back filling grouting method, the upper port of the segmented grouting pipe is covered with a sealing cap, and the lower port of the segmented grouting pipe is installed with a valve.

[0022] The technical solution of the present invention achieves the following beneficial technical effects:

[0023] 1. By welding segmented grouting pipes of different heights on the side wall of the wall casing, the grouting pipes are installed synchronously after the wall casing is lowered. The grouting depth is not limited or affected by the well depth, which meets the grouting needs of different depths and can achieve high-quality grouting filling, especially in the deep position of the well.

[0024] 2. The height difference between adjacent segmented grouting pipes is the height of each grouting section. Only a simple structure is used to accurately control the height of each section of downhole grouting. No complex structure is required. The pressure on the wall casing can be controlled to avoid deformation of the wall casing. The pressure on each section of the high well wall is close, which improves the quality of the cement slurry after solidification. At the same time, the segmented grouting pipe can also be used as a drain pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the construction of a grouting device for filling the wall of a casing pipe at the back of a mine feed hole according to the present invention;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of the wall protection sleeve of the present invention;

[0027] Figure 3 A schematic top view of the structure of the wall protection sleeve of the present invention.

[0028] The reference numerals in the figure are as follows: 1-wellhead platform; 2-underground tunnel; 3-wellway; 4-wall casing; 5-support crossbeam; 6-lower wellhead sealing plate; 7-grouting through pipe; 8-segmented grouting pipe; 9-valve; 10-sealing cap; 11-grouting hose; 12-support pier. DETAILED DESCRIPTION

[0029] Example 1

[0030] The mine feed hole wall protection casing wall back filling grouting device in this embodiment is as follows Figure 1 As shown, the lower port of the shaft 3 is connected to the underground tunnel 2, and the wall protection casing 4 is arranged in the shaft 3. There is an annular space between the wall protection casing 4 and the shaft 3. A grouting pipe 7 is arranged on the side wall of the wall protection casing 4. The upper port of the grouting pipe 7 extends toward the wellhead direction of the shaft 3, and the lower port of the grouting pipe 7 enters the underground tunnel 2. The grouting pipe 7 is arranged along the length direction of the wall protection casing 4.

[0031] like Figure 2-3As shown, more than two segmented grouting pipes 8 are arranged on the side wall of the wall protection casing 4, and the lower ports of the segmented grouting pipes 8 enter the underground tunnel 2. The upper ports of the two or more segmented grouting pipes 8 are staggered in axial positions on the side wall of the wall protection casing 4 and gradually rise in sequence. The segmented grouting pipes 8 are arranged along the length direction of the wall protection casing 4, and the two or more segmented grouting pipes 8 are distributed along the circumference of the wall protection casing 4. The segmented grouting pipes 8 can also serve as drain pipes.

[0032] like Figure 1 As shown, during grouting, the lower port of the grouting through pipe 7 is fluidly connected with the lower ports of different segmented grouting pipes 8 in sequence to perform segmented grouting. A grouting hose 11 is fluidly connected on the lower port of the grouting through pipe 7. The grouting hose 11 is fluidly connected with the lower port of the segmented grouting pipe 8, and the grouting hose 11 is detachably connected to the lower port of the segmented grouting pipe 8, such as by a threaded connection.

[0033] like Figure 1 As shown, a valve 9 is installed on the lower port of the segmented grouting pipe 8; a sealing cap 10 is covered on the end of the upper port of the segmented grouting pipe 8; a lower wellhead sealing plate 6 is provided on the bottom of the hole of the shaft 3, and the lower wellhead sealing plate 6 is fixedly connected to the top of the underground tunnel 2, and the lower wellhead sealing plate 6 is sealed and connected to the bottom of the hole 3; the lower port of the wall protection casing 4 and the lower port of the segmented grouting pipe 8 pass through the lower wellhead sealing plate 6, and a supporting pier 12 is provided on the ground of the underground tunnel 2, and the lower port of the wall protection casing 4 passes through the lower wellhead sealing plate 6 and is supported on the supporting pier 12; a supporting cross arm 5 is fixedly connected to the wellhead of the shaft 3, and the wall protection casing 4 passes through the supporting cross arm 5 and is connected to the supporting cross arm 5.

[0034] Example 2

[0035] The method for filling and grouting the wall of the casing of the mine feed hole in this embodiment uses the filling and grouting device in Example 1 to perform grouting. Figure 1 As shown, the following steps are included:

[0036] Step A: Processing the wall protection sleeve 4: Weld a grouting pipe 7 on the side wall of the wall protection sleeve 4, and the grouting pipe 7 is arranged along the length direction of the wall protection sleeve 4; then weld 1# segmented grouting pipe 8, 2# segmented grouting pipe 8 and n# segmented grouting pipe 8 in sequence along the circumferential direction on the side wall of the wall protection sleeve 4, and the upper ports of the segmented grouting pipes 8 are staggered in axial positions on the side wall of the wall protection sleeve 4, and the upper port positions of the 1# segmented grouting pipe 8, the 2# segmented grouting pipe 8 and the n# segmented grouting pipe 8 are staggered in axial positions on the side wall of the wall protection sleeve 4. The height difference between adjacent segmented grouting pipes 8 is the height of each segment of grouting construction; the upper end of the segmented grouting pipe 8 is covered with a sealing cap 10, which can ensure that when the wall casing 4 is installed, the rock debris on the well wall will not fall into the segmented grouting pipe 8. The sealing cap 10 can be made of a plastic film or a material that is easily broken under pressure, and can be naturally broken when subjected to grouting pressure or cement slurry pressure in the annular space. A valve 9 is installed on the lower end of the segmented grouting pipe 8;

[0037] Step B: Installing the wall protection sleeve 4: After the well 3 is drilled, the wall protection sleeve 4 is lifted by a lifting device and installed in the well 3 until the lower end of the wall protection sleeve 4 enters the underground tunnel 2 and is pressed on the supporting pier 12 in the underground tunnel 2; the upper end of the grouting pipe 7 is directed toward the opening direction of the well 3, the lower end of the grouting pipe 7 enters the underground tunnel 2, and the lower end of the segmented grouting pipe 8 enters the underground tunnel 2;

[0038] Step C: Blocking the annular space: Install a lower wellhead blocking plate 6 at the position where the well 3 and the underground tunnel 2 are connected, and use the lower wellhead blocking plate 6 to block the annular space between the lower end of the well 3 and the wall protection casing 4; make the lower end of the wall protection casing 4 and the lower end of the segmented grouting pipe 8 pass through the lower wellhead blocking plate 6 and enter the underground tunnel 2;

[0039] Step D: First stage high grouting: connect the upper port of the grouting pipe 7 to the grouting pump, connect the grouting hose 11 to the lower port of the grouting pipe 7, and connect the other end of the grouting pipe 7 to the lower port of the 1# segmented grouting pipe 8; start the grouting pump, and inject cement slurry into the annular space between the wall casing 4 and the shaft 3 through the grouting pipe 7, the grouting hose 11 and the 1# segmented grouting pipe 8 in sequence;

[0040] Step E: When the cement slurry flows out from the 2# segmented grouting pipe 8, the grouting pump is turned off, the 1# segmented grouting pipe 8 is blocked, the grouting hose 11 is removed from the lower port of the 1# segmented grouting pipe 8, and the grouting pipe 7 and the grouting hose 11 are flushed; the first high grouting is completed;

[0041] Step F: After the first stage of high-pressure grouting is completed, wait for the cement slurry to solidify for 48 hours, and repeat the steps D to E on the basis of the first stage of high-pressure grouting until the nth stage of high-pressure grouting is completed, so that the cement slurry is filled to the wellhead of the shaft 3, and the annular space filling grouting is completed.

[0042] The method of backfilling grouting of the casing wall of the mine feed hole in this implementation was used to conduct a test in a coal mine field:

[0043] The coal mine field belongs to the middle and low mountainous area of ​​tectonic denudation, with well-developed gullies, cut and broken terrain, and terrain slopes of 20-30°. The terrain is high in the middle and low in the east and west. The highest point is located on the ridge in the northeast of the field, with an altitude of 1327.5m, and the lowest point is located in the Changhe River Valley in the east of the field, with an altitude of 877.2m, with a relative height difference of 450.3m.

[0044] The feed hole is 618m deep, 1.0m in diameter and 90° in angle. A DN620mm×20mm wall casing is placed in the hole, and cement slurry is used to fill the space between the wall casing and the surrounding rock. The construction site of the feed hole is located on the ground of the coal mine well area, with one side close to the Grand Canyon. The upper wellhead elevation is +1074.000m, and the lower wellhead elevation is +456.000m. The rock strata of the feed hole are mainly medium-fine-grained sandstone, interspersed with sandy mudstone. After drilling the feed hole, the static water level was measured to be 410m away from the wellhead, and the water inflow was about 0.5m 3 / h.

[0045] The grouting filling scheme adopts the grouting method of this embodiment, that is, the bottom relay grouting method. The feed hole is 618m deep and is divided into 7 filling sections. From the lower wellhead annular space to the upper wellhead annular space, the height of each filling section is 50m, 100m, 100m, 100m, 100m, 100m, 68m, respectively. The first 5 filling sections are filled by grouting pipes 1, 2, 3, 4, and 5, respectively, and the subsequent two filling sections are filled by the free-moving grouting pipes lowered from the upper wellhead annular space.

[0046] The quality of grouting filling behind the wall is tested on site from two aspects: one is the cement bonding condition behind the wall, and the other is whether there is visible deformation on the inner side of the wall casing. The cement bonding condition behind the wall is measured by the acoustic variable density logging method, which can evaluate the bonding condition of the two interfaces between the casing and cement, and cement and rock formation. Downhole television directly observes whether there is visible deformation of the casing. On-site inspection shows that the grouting bonding condition is good, and there is no visible deformation on the inner wall of the casing, which fully meets the construction requirements.

[0047] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A grouting device for filling a wall casing of a mine feed hole, wherein the lower end of a shaft (3) is connected to an underground tunnel (2), a wall casing (4) is arranged in the shaft (3), and an annular space is provided between the wall casing (4) and the shaft (3), characterized in that: A grouting pipe (7) is arranged on the side wall of the wall protection casing (4), the upper end of the grouting pipe (7) extends toward the wellhead of the wellbore (3), and the lower end of the grouting pipe (7) enters the underground tunnel (2). Two or more segmented grouting pipes (8) are arranged on the side wall of the wall protection casing (4), and the lower end of the segmented grouting pipe (8) enters the underground tunnel (2). The upper ends of the two or more segmented grouting pipes (8) are staggered in axial positions on the side wall of the wall protection casing (4), and the lower end of the grouting pipe (7) is fluidically connected with the lower ends of different segmented grouting pipes (8) in sequence.

2. The mine feed hole wall protection casing wall back filling grouting device according to claim 1 is characterized in that: The upper ports of the two or more segmented grouting pipes (8) are arranged in ascending axial positions on the side wall of the wall protection sleeve (4).

3. The mine feed hole wall protection casing wall backfilling grouting device according to claim 1 is characterized in that: A grouting hose (11) is fluid-conducted on the lower port of the grouting passage (7), and the grouting hose (11) is fluid-conducted with the lower port of the segmented grouting pipe (8), and the grouting hose (11) and the lower port of the segmented grouting pipe (8) are detachably connected.

4. The rear filling grouting device for the casing wall of a mine feed hole according to claim 1 is characterized in that: A valve (9) is installed on the lower port of the segmented grouting pipe (8); and a sealing cap (10) is covered on the end of the upper port of the segmented grouting pipe (8).

5. The mine feed hole wall protection casing wall back filling grouting device according to claim 1, characterized in that: The grouting through pipe (7) is arranged along the length direction of the wall protection sleeve (4), the segmented grouting pipe (8) is arranged along the length direction of the wall protection sleeve (4), and more than two segmented grouting pipes (8) are distributed along the circumference of the wall protection sleeve (4).

6. The device for filling and grouting the wall of the casing pipe of the mine feed hole according to any one of claims 1 to 5, characterized in that: A lower wellhead plugging plate (6) is provided at the bottom of the well (3), and the lower wellhead plugging plate (6) is fixedly connected to the top of the underground tunnel (2), and the lower wellhead plugging plate (6) is sealedly connected to the bottom of the material hole (3); the lower port of the wall protection casing (4) and the lower port of the segmented grouting pipe (8) pass through the lower wellhead plugging plate (6).

7. The rear filling grouting device for the casing wall of a mine feed hole according to claim 6 is characterized in that: A support pier (12) is provided on the ground of the underground tunnel (2), and the lower end of the wall protection casing (4) passes through the lower wellhead plugging plate (6) and is supported on the support pier (12).

8. The rear filling grouting device for the casing wall of a mine feed hole according to claim 6 is characterized in that: A supporting cross arm (5) is fixedly connected to the wellhead of the wellway (3), and the wall protection casing (4) passes through the supporting cross arm (5) and is connected to the supporting cross arm (5).

9. A method for filling and grouting the wall of a casing pipe in a mine feed hole, characterized in that: Grouting is performed using the mine feed hole wall protection casing wall backfilling grouting device described in any one of claims 1 to 8, comprising the following steps: Step A: Processing the wall protection sleeve (4): welding a grouting pipe (7) on the side wall of the wall protection sleeve (4), the grouting pipe (7) being arranged along the length direction of the wall protection sleeve (4); then welding a 1# segmented grouting pipe (8), a 2# segmented grouting pipe (8) and an n# segmented grouting pipe (8) in sequence along the circumferential direction on the side wall of the wall protection sleeve (4), the upper ports of the segmented grouting pipes (8) being arranged at axial positions staggered with each other on the side wall of the wall protection sleeve (4), and the upper ports of the 1# segmented grouting pipe (8), the 2# segmented grouting pipe (8) and the n# segmented grouting pipe (8) being arranged at positions that are successively raised; Step B: installing the wall protection sleeve (4): after the wellbore (3) is drilled, the wall protection sleeve (4) is lifted by a lifting device and installed in the wellbore (3) until the lower end of the wall protection sleeve (4) enters the underground tunnel (2) and is pressed against the supporting pier (12) in the underground tunnel (2); the upper end of the grouting pipe (7) is directed toward the opening of the wellbore (3), the lower end of the grouting pipe (7) enters the underground tunnel (2), and the lower end of the segmented grouting pipe (8) enters the underground tunnel (2); Step C: sealing the annular space: installing a lower wellhead sealing plate (6) at the position where the well (3) and the underground tunnel (2) are connected, and using the lower wellhead sealing plate (6) to seal the annular space between the lower end of the well (3) and the wall protection casing (4); allowing the lower end of the wall protection casing (4) and the lower end of the segmented grouting pipe (8) to pass through the lower wellhead sealing plate (6) and enter the underground tunnel (2); Step D: First stage high grouting: connect the upper end of the grouting pipe (7) to the grouting pump, connect the grouting hose (11) to the lower end of the grouting pipe (7), and connect the other end of the grouting pipe (7) to the lower end of the No. 1 segmented grouting pipe (8); start the grouting pump, and inject cement slurry into the annular space between the wall casing (4) and the shaft (3) through the grouting pipe (7), the grouting hose (11) and the No. 1 segmented grouting pipe (8) in sequence; Step E: When cement slurry flows out of the 2# segmented grouting pipe (8), the grouting pump is turned off, the 1# segmented grouting pipe (8) is blocked, the grouting hose (11) is removed from the lower end of the 1# segmented grouting pipe (8), and the grouting pipe (7) and the grouting hose (11) are flushed; and the first high grouting is completed; Step F: After the first stage of high-pressure grouting is completed, wait for the cement slurry to solidify for 48 hours, and repeat the steps D to E on the basis of the first stage of high-pressure grouting until the nth stage of high-pressure grouting is completed, so that the cement slurry is filled to the wellhead of the shaft (3), and the annular space filling grouting is completed.

10. The method for filling and grouting the casing wall of a mine feed hole according to claim 9, characterized in that: The upper port of the segmented grouting pipe (8) is covered with a sealing cap (10), and the lower port of the segmented grouting pipe (8) is installed with a valve (9).

Images