Method for treating the clogging of a grouting borehole

Abstract

The method for treating the blockage of the grouting borehole comprises the following steps: S1, using a hole cleaning drilling machine to clean the blocked grouting pipe and making the tubular drill rod of the hole cleaning drilling machine extend to the bottom of the grouting pipe; S2, arranging an observation pipe communicated with the grouting pipe on the ground, and installing a first pressure gauge on the observation pipe; S3, opening the outlet of the observation pipe, and injecting water into the grouting pipe through the drill rod; S4, closing the outlet of the observation pipe, injecting water into the grouting pipe through the drill rod, detecting the water pressure in the drill rod by using a second pressure gauge, and judging whether the grouting pipe is cleaned according to the detection values of the first pressure gauge and the second pressure gauge; S5, opening the outlet of the observation pipe, and injecting gas into the grouting pipe through the drill rod; and S6, closing the outlet of the observation pipe, injecting water into the grouting pipe through the drill rod, and detecting the water pressure at the orifice of the drill rod by using the second pressure gauge. Therefore, the method for treating the blockage of the grouting borehole has the advantage that the grouting pipe is convenient to clean.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining, in particular to a method for treating plugging of a grouting borehole. BACKGROUND

[0002] The overburden separation grouting subsidence reduction technology is widely used, however, the grouting borehole constructed in advance is often affected by the advanced mining and the borehole wall collapses and is blocked. In order to protect the stability of the borehole wall, the separation grouting borehole is generally lowered into a petroleum casing as a wall protection casing, and a seamless steel pipe is lowered into the wall protection casing as a grouting pipe. The grouting pipe in the borehole is generally lowered into the grouting layer position of the borehole, about 10m from the bottom of the borehole. However, in the overburden separation filling grouting construction process, due to the overburden separation space development law, the grouting period of the separation grouting borehole is generally longer, mostly more than one month. However, the separation grouting borehole penetrates the separation space, and the mutual connectivity is good, causing the grouting liquid to be often mixed in the borehole during the grouting of multiple boreholes. If not careful, the borehole will be blocked. The grouting liquid is often mixed in the borehole during the grouting of multiple boreholes, and a borehole blocking accident often occurs. Once the borehole is blocked, the grouting pipe in the borehole is difficult to pull out, causing the borehole blocking accident to be difficult to handle, especially for the blocking accident of a large inclination directional borehole, which is more difficult to handle. And secondary accidents are prone to occur during the accident handling process, and even the borehole is scrapped. The borehole cost is increased, the construction period is delayed, and even the underground coal mining production progress is affected, causing great economic losses. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, an embodiment of the present application provides a method for treating plugging of a grouting borehole.

[0004] The method for treating plugging of a grouting borehole according to an embodiment of the present application comprises the following steps:

[0005] S1, using a hole cleaning drill to clean the blocked grouting pipe and extending a tubular drill rod of the hole cleaning drill to the bottom of the grouting pipe;

[0006] S2, setting an observation pipe in communication with the grouting pipe on the ground, and installing a first pressure gauge on the observation pipe, so that the first pressure gauge can detect the pressure in the gap between the grouting pipe and the drill rod by using the observation pipe;

[0007] S3, opening the outlet of the observation pipe, and injecting water into the grouting pipe through the drill rod, so that the grouting pipe can be cleaned by using water, and the water in the grouting pipe can be discharged from the observation pipe and carry out the sediment;

[0008] S4, close the outlet of the observation tube, inject water into the grouting pipe through the drill pipe, detect the water pressure in the drill pipe by using a second pressure gauge, and determine whether the grouting pipe is swept through according to the detection values of the first pressure gauge and the second pressure gauge;

[0009] S5, open the outlet of the observation tube, inject gas into the grouting pipe through the drill pipe, so as to clean the grouting pipe by using the gas, and enable the gas and water in the grouting pipe to be discharged from the observation tube and carry out the sediment;

[0010] S6, close the outlet of the observation tube, inject water into the grouting pipe through the drill pipe, detect the water pressure at the orifice of the drill pipe by using the second pressure gauge, and determine whether the grouting pipe meets the grouting condition according to the detection value of the second pressure gauge, if the grouting pipe does not meet the grouting condition, then repeat the steps S5 and S6 in turn;

[0011] Wherein, after determining that the grouting pipe is not swept through in the step S4, the step S3 and the step S4 are implemented in turn, and after determining that the grouting pipe is swept through in the step S4, the step S5 is entered.

[0012] Therefore, the grouting hole plugging treatment method according to the embodiment of the application has the advantage of facilitating the sweeping of the grouting pipe.

[0013] In some embodiments, the grouting pipe, the second casing and the first casing of the drill hole are arranged in turn from inside to outside;

[0014] In the step S1,

[0015] A first sealing member which is in sliding sealing with the drill pipe is arranged at the upper pipe opening of the grouting pipe;

[0016] A second sealing member which is in sealing connection with the grouting pipe is arranged at the upper pipe opening of the second casing;

[0017] A third sealing member which is in sealing connection with the second casing is arranged at the upper pipe opening of the first casing.

[0018] In some embodiments, in the step S3, the water discharged from the observation tube is stopped after the sediment is not present.

[0019] In some embodiments, in the step S4, when the difference between the detection value of the second pressure gauge and the detection value of the first pressure gauge is less than or equal to 3MPa, it is determined that the grouting pipe is swept through.

[0020] In some embodiments, in the step S4,

[0021] When the difference between the detection value of the second pressure gauge and the detection value of the first pressure gauge is less than or equal to 3 MPa, the water injection is stopped and the pressure of the drill pipe is released, and if the pressure in the drill pipe cannot be reduced to zero after a first preset time, the observation pipe is opened and gas is injected into the grouting pipe through the observation pipe so as to sweep the grouting pipe with the gas.

[0022] In some embodiments, in the step S2, a tee joint, an air compressor and a pump body are arranged at the upper part of the drill pipe, the air compressor and the pump body can communicate with the drill pipe through the tee joint, the air compressor can inject gas into the drill pipe, the pump body can inject water into the drill pipe, and the second pressure gauge is arranged on the tee joint.

[0023] In some embodiments, the step S5 can be implemented for multiple times.

[0024] In the step S5, the water injection can be stopped when the water discharged from the observation pipe becomes clear.

[0025] In some embodiments, in the step S6, the water pressure detection value at the orifice of the drill pipe detected by the second pressure gauge is greater than or equal to 1.5 MPa and less than or equal to 3 MPa, and it is determined that the grouting pipe meets the grouting condition.

[0026] In some embodiments, in the step S6, when water is injected into the grouting pipe by the pump body, the water injection pressure of the pump body is less than or equal to 4 MPa.

[0027] In some embodiments, in the step S6, the water injection flow rate into the grouting pipe is gradually increased from small to large to a second preset value. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is a schematic view of a grouting pipe and a drill pipe according to an embodiment of the present application.

[0029] Fig. 2 is a schematic view of a grouting pipe and a drill pipe according to an embodiment of the present application.

[0030] Fig. 3 is a schematic view of a grouting pipe and a drill pipe according to an embodiment of the present application.

[0031] REFERENCE SIGNS:

[0032] Grouting pipe 1, first sealing member 11;

[0033] Drill pipe 2, second pressure gauge 21, tee joint 22, second control valve 23, third control valve 24;

[0034] Observation pipe 3, first pressure gauge 31, first control valve 32;

[0035] Two-opening sleeve 4, second sealing member 41;

[0036] One-opening sleeve 5, third sealing member 51;

[0037] Air compressor 6;

[0038] Pump body 7. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0040] A method for treating a blocked grouting borehole according to an embodiment of the present application is described below with reference to the accompanying drawings. As shown in Figs. 1-3 the method for treating a blocked grouting borehole according to an embodiment of the present application includes the following steps:

[0041] S1, a hole cleaning drilling machine is used to clean the blocked grouting pipe 1 and the tubular drill rod 2 of the hole cleaning drilling machine is extended to the bottom of the grouting pipe 1. Specifically, the bottom of the drill rod 2 is provided with a drill bit, the hole cleaning drilling machine drives the drill rod 2 to rotate and drill downward in the grouting pipe 1 so that the bottom of the drill rod 2 is extended to the bottom of the grouting pipe 1. For example, the grouting pipe 1 is a φ5.5x73mm seamless steel pipe. The hole cleaning capacity of the hole cleaning drilling machine is greater than 1000m, the drill rod 2 matched with the hole cleaning is a φ4.5x50mm seamless steel pipe, and the size of the drill bit is a φ50.3mm composite bit.

[0042] As shown in Figs. 1-3 in some embodiments, the grouting pipe 1, the two-opening sleeve 4 and the one-opening sleeve 5 of the drill hole are sequentially arranged from inside to outside. In step S1, a first sealing member 11 is arranged at the upper pipe opening of the grouting pipe 1 and is in sliding sealing connection with the drill rod 2, so that the drill rod 2 can move (slide) relative to the grouting pipe 1. The first sealing member 11 can be additionally provided with a sealing member for movable pressure-bearing sealing.

[0043] A second sealing member 41 is arranged at the upper pipe opening of the two-opening sleeve 4 and is in sealing connection with the grouting pipe 1, and a third sealing member 51 is arranged at the upper pipe opening of the one-opening sleeve 5 and is in sealing connection with the two-opening sleeve 4. In this way, the upper pipe opening of one of the grouting pipe 1, the two-opening sleeve 4 and the one-opening sleeve 5 can be sealed by the sealing member, so that the grouting pipe 1 can be conveniently dredged. For example, the first sealing member 11, the second sealing member 41 and the third sealing member 51 each include a flange. The first sealing member 11 is welded at the upper pipe opening of the grouting pipe 1, the second sealing member 41 is welded at the upper pipe opening of the two-opening sleeve 4, and the third sealing member 51 is welded at the upper pipe opening of the one-opening sleeve 5.

[0044] S2. An observation pipe 3 connected to the grouting pipe 1 is installed on the ground. A first pressure gauge 31 is installed on the observation pipe 3 so that the first pressure gauge 31 can detect the pressure in the gap between the grouting pipe 1 and the drill rod 2 using the observation pipe 3. Specifically, the observation pipe 3 extends horizontally and is equipped with a first control valve 32, which can control the opening and closing of the observation pipe 3. Liquid can sequentially enter the observation pipe 3 from the drill rod 2 and the gap between the grouting pipe 1 and the drill rod 2. The first pressure gauge 31 is located between the grouting pipe 1 and the first control valve 32, and the pressure in the grouting pipe 1 (between the drill rod 2) can be detected by the first pressure gauge 31.

[0045] like Fig. 1 As shown, in some embodiments, the observation tube 3 passes through the two-sleeve 4 and is connected to the grouting pipe 1.

[0046] like Figs. 1-3 As shown, in some embodiments, in step S2, a tee 22, an air compressor 6, and a pump body 7 are provided on the upper part of the drill rod 2. The air compressor 6 and the pump body 7 can be connected to the drill rod 2 through the tee 22. The air compressor 6 can inject gas into the drill rod 2, and the pump body 7 can inject water into the drill rod 2. A second pressure gauge 21 is provided on the tee 22. Specifically, the two connection ports of the tee 22 are respectively connected to the air compressor 6 and the pump body 7. A second control valve 23 and a third control valve 24 are respectively provided on the two connection ports of the tee 22 so that the second control valve 23 and the third control valve 24 can respectively control the connection between the drill rod 2 and the air compressor 6 and the pump body 7.

[0047] For example, pump body 7 is a cleaning pump with a working pressure greater than or equal to 10 MPa and a theoretical grouting flow rate greater than or equal to 300 L / min. Air compressor 6 is a piston air compressor. First control valve 32, second control valve 23, and third control valve 24 are all ball shut-off valves, and the pressure gauges of first pressure gauge 31 and second pressure gauge 21 are 16 MPa anti-vibration pressure gauges.

[0048] In some embodiments, the distance between the observation pipe 3 and the upper opening of the grouting pipe 1 is greater than or equal to 150 mm and less than or equal to 350 mm. For example, the distance between the observation pipe 3 and the upper opening of the grouting pipe 1 is 250 mm.

[0049] S3. Open the outlet of observation pipe 3 and inject water into grouting pipe 1 through drill rod 2 to clean grouting pipe 1 with water and allow the water in grouting pipe 1 to be discharged from observation pipe 3, carrying away sediment. Specifically, open the first control valve 32, the third control valve 24, and the pump body 7. Pump body 7 pressurizes clean water into grouting pipe 1 through drill rod 2. The water in drill rod 2 enters the gap between grouting pipe 1 and borehole 2 and can be discharged from observation pipe 3, thereby cleaning the sediment in grouting pipe 1. Observe the slurry flowing out of observation pipe 3 until the backflow becomes clear and there is no sediment, which indicates that the water cleaning of grouting pipe 1 is complete. That is, stop water injection after the water discharged from observation pipe 3 is clear and there is no sediment. The sediment is fly ash slurry. Fly ash slurry itself has suspension properties and can be discharged from observation pipe 3 through pressure difference.

[0050] like Figs. 1-3 As shown, in some embodiments, a second pressure gauge 21 is installed at the top of the borehole to detect the water pressure inside the drill rod 2. The second pressure gauge 21 is located at the top of the tee 22.

[0051] S4. Close the outlet of observation pipe 3, inject water into grouting pipe 1 through drill rod 2, and use the second pressure gauge 21 to detect the water pressure inside drill rod 2. Determine whether grouting pipe 1 is cleared based on the detection values ​​of the first pressure gauge 31 and the second pressure gauge 21. Specifically, close the first control valve 32, open the third control valve 24 and pump body 7, and slowly pressurize water into drill rod 2 using pump body 7. Pump body 7 initially uses a low setting, and then gradually increases the setting; the higher the setting of pump body 7, the greater the water injection pressure. Use the second pressure gauge 21 to observe the pressure and water flow at the orifice on the drill rod, and use the automatic grouting system to record the water flow rate and pressure in real time. Use the first pressure gauge 31 to measure the pressure at the gap between grouting pipe 1 and drill rod 2. If the difference between the second pressure gauge 21 and the first pressure gauge 31 is large, it indicates that grouting pipe 1 is not cleared. If the difference between the second pressure gauge 21 and the first pressure gauge 31 is small, it indicates that grouting pipe 1 is cleared.

[0052] In step S4, if the difference between the measured value of the second pressure gauge 21 and the measured value of the first pressure gauge 31 is less than or equal to 3 MPa, then the grouting pipe 1 is determined to be unobstructed. Specifically, if the grouting pipe 1 is determined to be unobstructed in step S4, steps S3 and S4 are repeated sequentially. If the grouting pipe 1 is determined to be unobstructed in step S4, then step S5 is performed. In other words, after verifying the grouting pipe 1, if the difference between the measured value of the second pressure gauge 21 and the measured value of the first pressure gauge 31 is less than or equal to 3 MPa, then the grouting pipe 1 is considered unobstructed, and the next step (step S5) can be proceeded. If the difference between the measured value of the second pressure gauge 21 and the measured value of the first pressure gauge 31 is greater than 3 MPa, then steps S3 and S4 are repeated sequentially to ensure the grouting pipe 1 is unobstructed and to verify its functionality.

[0053] In some embodiments, in step S4, after the difference between the detected value of the second pressure gauge 21 and the detected value of the first pressure gauge 31 is less than or equal to 3 MPa, the water injection is stopped (the pump body 7 is closed) and the drill pipe 2 is depressurized (naturally).

[0054] If the pressure in the drill pipe 2 (at the upper aperture) cannot be returned to zero after the first preset time, the observation pipe 3 is opened and gas is injected into the grouting pipe 1 through the observation pipe 3, so as to use the gas to sweep the grouting pipe 1. That is, the gas is pressed into the grouting pipe 1 through the observation pipe 3, so as to sweep the grouting pipe 1.

[0055] Specifically, if the pressure in the drill pipe 2 cannot be returned to zero for a certain period of time, it is proved that the grouting channel in the drill pipe 2 and the target layer is not formed. At this moment, the observation pipe 3 is opened, the air compressor 6 is connected with the observation pipe 3, and the observation pipe 3 is used to press gas into the grouting pipe 1 to wash the hole. The gas flow enters the annular space between the grouting pipe 1 and the drill hole 2 and the stratum fissure through the grouting pipe 1 flower (the hole body at the bottom of the grouting pipe 1), the gas flow first pushes the water pressure in the grouting pipe 1 to open the grouting pipe 1 flower, and further washes the blocked flower. The compressed water flow along the hole wall of the drill pipe 2 flows upward and out of the drill pipe 2, and part of the gas flow enters the stratum fissure along the hole wall. A negative pressure is formed in the grouting pipe 1, so that the water in the separation zone (water-conducting fissure connected with the drill hole) flows into the grouting pipe 1. After repeating the step (washing the hole by using the air compressor 6), the water flow is gradually increased, and under the influence of mining, the separation zone (water-conducting fissure connected with the drill hole) and the target layer form a new channel, so as to achieve the grouting condition.

[0056] S5, the outlet of the observation pipe 3 is opened, and gas is injected into the grouting pipe 1 through the drill pipe 2, so as to use the gas to clean the grouting pipe 1 and the gas and water in the grouting pipe 1 can be discharged from the observation pipe 3 and carry out the sediment. Specifically, the first control valve 32 on the observation pipe 3 is opened first, the observation pipe 3 is normal, the second control valve 23 and the air compressor 6 are opened. The air compressor 6 is used to blow the drill pipe 2 to wash the hole, the water discharge amount and the amount of impurities contained in the water discharge of the observation pipe 3 are observed and recorded, and the water discharge time is recorded.

[0057] In some embodiments, step S5 can be implemented multiple times, and the step 5 operation is continuously repeated until the water flow from the observation tube 3 becomes large and clear (without impurities) and the water injection time becomes short and relatively stable. That is, the injection of gas can be stopped when the water discharged from the observation tube 3 becomes clear in step S5. Specifically, the water injection from the air compressor 6 to the observation tube 3 without water discharge is a water injection cycle. Due to the slurry stringing, most of the separation zone (water-conducting fracture connected to the borehole) around the bottom of the drill pipe 2 is blocked. During the air compressor 6 hole cleaning process, a negative pressure is formed in the grouting pipe 1, and the water in the separation zone (water-conducting fracture connected to the borehole) flows into the grouting pipe 1. This process gradually increases the water-conducting capacity, so the step 5 operation needs to be continuously repeated until the water flow from the observation tube 3 becomes large and clear (without impurities) and the water injection time becomes short and relatively stable.

[0058] S6, close the outlet of the observation tube 3, inject water into the grouting pipe 1 through the drill pipe 2, detect the water pressure at the orifice of the drill pipe 2 by using the second pressure gauge 21, and determine whether the grouting pipe 1 meets the grouting conditions according to the detection value of the second pressure gauge 21. If the grouting pipe 1 does not meet the grouting conditions, steps S5 and S6 are repeatedly implemented in turn to ensure that the grouting pipe 1 is swept through. Specifically, in step S6, if the water pressure detection value at the orifice of the drill pipe 2 detected by using the second pressure gauge 21 is greater than or equal to 1.5 MPa and less than or equal to 3 MPa, it is determined that the grouting pipe 1 meets the grouting conditions.

[0059] In some embodiments, in step S6, the water injection flow rate into the grouting pipe 1 is gradually increased from small to large to a second preset value. In this way, the water injection pressure can be controlled. Specifically, in step S6, when the pump body 7 is used to inject water into the grouting pipe 1, the water injection pressure of the pump body 7 is less than or equal to 4 MPa. When the water injection pressure of the pump body 7 is higher than 4 MPa, the operation is performed in a downshift mode (the mud pump gear positions are sequentially reduced to 0.9, 0.8, 0.7, 0.6, 0.5, and the lower the pump body 7 gear position, the smaller the water injection pressure of the pump body 7), so that the water injection pressure can be reduced. Controlling the water injection pressure can prevent the grouting channel from being blocked and the surface from being fractured. In the early stage of grouting water injection, the grouting channel is relatively narrow, and small flow and low pump pressure control are required. The flow rate is gradually increased according to the water injection pressure. If the water injection is performed with a large pump, the sludge in the hole will accumulate too quickly, causing the grouting channel to be blocked.

[0060] The grouting borehole blocking processing method according to the embodiments of the present application can sweep through the grouting pipe 1 through the above steps, and solve the problem of the blocking of a certain grouting borehole caused by the simultaneous grouting of multiple holes and the mutual hole stringing of slurry in the construction process of the overburden separation grouting.

[0061] Therefore, the grouting borehole blocking processing method according to the embodiments of the present application has the advantage of facilitating the sweeping through of the grouting pipe 1.

[0062] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0063] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0064] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0066] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising, containing, comprising, having, including, holding, characteπzed by, having at least, including at least, or the like, and is not meant to be the exclusive "consisting only of.

[0067] Although the above-mentioned embodiments have been shown and described, it is understood that the above-mentioned embodiments are exemplary, and cannot be understood as limiting the present disclosure, and the changes, modifications, replacements, and variations of the above-mentioned embodiments made by those skilled in the art are within the protection scope of the present disclosure.

Claims

1. A method for treating a borehole plug with a grout, characterized by, The method comprises the following steps: S1, using a hole cleaning drill to clean the blocked grouting pipe and make the tubular drill rod of the hole cleaning drill extend to the bottom of the grouting pipe; S2, setting an observation pipe on the ground which communicates with the grouting pipe, and installing a first pressure gauge on the observation pipe so that the first pressure gauge can detect the pressure in the gap between the grouting pipe and the drill rod by using the observation pipe; S3, opening the outlet of the observation pipe, injecting water into the grouting pipe through the drill rod, so as to clean the grouting pipe with water and make the water in the grouting pipe be discharged from the observation pipe and carry out the sediment; S4, closing the outlet of the observation pipe, injecting water into the grouting pipe through the drill rod, detecting the water pressure in the drill rod by using a second pressure gauge, and judging whether the grouting pipe is cleaned according to the detection values of the first pressure gauge and the second pressure gauge; S5, opening the outlet of the observation pipe, injecting gas into the grouting pipe through the drill rod, so as to clean the grouting pipe with gas and make the gas and water in the grouting pipe be discharged from the observation pipe and carry out the sediment; S6, closing the outlet of the observation pipe, injecting water into the grouting pipe through the drill rod, detecting the water pressure at the orifice of the drill rod by using the second pressure gauge, and judging whether the grouting pipe meets the grouting condition according to the detection value of the second pressure gauge, if the grouting pipe does not meet the grouting condition, then repeatedly implementing the step S5 and the step S6 in turn; Wherein, after judging that the grouting pipe is not cleaned in the step S4, the step S3 and the step S4 are implemented in turn, and after judging that the grouting pipe is cleaned in the step S4, the step S5 is entered.

2. The grouting borehole blockage processing method according to claim 1, wherein, The grouting pipe, the second casing and the first casing of the borehole are arranged in turn from inside to outside; In the step S1, A first sealing element which is in sliding sealing with the drill rod is arranged at the upper pipe opening of the grouting pipe; A second sealing element which is in sealing connection with the grouting pipe is arranged at the upper pipe opening of the second casing; A third sealing element which is in sealing connection with the second casing is arranged at the upper pipe opening of the first casing.

3. The method according to claim 1, wherein In the step S3, the water discharged from the observation pipe is stopped after no sediment.

4. The grouting borehole blockage processing method according to claim 1, wherein, In the step S4, if the difference between the detection value of the second pressure gauge and the detection value of the first pressure gauge is less than or equal to 3MPa, it is judged that the grouting pipe is cleaned.

5. The method according to claim 3, wherein In the step S4, After the difference between the detection value of the second pressure gauge and the detection value of the first pressure gauge is less than or equal to 3MPa, the water injection is stopped and the pressure of the drill rod is released, if the pressure in the drill rod cannot be zeroed after a first preset time, the observation pipe is opened and gas is injected into the grouting pipe through the observation pipe, so as to clean the grouting pipe with gas.

6. The method of claim 1, wherein, In the step S2, a tee joint, an air compressor and a pump body are arranged on the upper part of the drill pipe, the air compressor and the pump body can communicate with the drill pipe through the tee joint, the air compressor can inject gas into the drill pipe, the pump body can inject water into the drill pipe, and the second pressure gauge is arranged on the tee joint.

7. The method according to claim 1, wherein the step S5 is performed multiple times. The step S5 can be performed multiple times. In the step S5, the injection of the gas can be stopped when the water discharged from the observation tube becomes clear.

8. The method of claim 1, wherein, In the step S6, the water pressure detection value at the orifice of the drill pipe detected by the second pressure gauge is greater than or equal to 1.5 MPa and less than or equal to 3 MPa, and it is determined that the grouting pipe meets the grouting condition.

9. The method of claim 1, wherein, In the step S6, when the pump body injects water into the grouting pipe, the water injection pressure of the pump body is less than or equal to 4 MPa.

10. The method of claim 1, wherein, In the step S6, the water injection flow rate into the grouting pipe is gradually increased from small to large to a second preset value.

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