Deep stratum native fracture slurry filling pressure judgment device and grouting pressure judgment method thereof

Abstract

The invention discloses a deep stratum native fracture slurry filling pressure judgment device and a grouting pressure judgment method thereof.The deep stratum native fracture slurry filling pressure judgment device comprises a grouting hole formed in a foundation and further comprises grouting equipment arranged at the grouting hole and used for conducting grouting on the positions, with different depths, of the grouting hole; the multiple groups of detection holes are uniformly distributed around the grouting holes; the pressure judgment units are arranged in the detection holes and used for judging the grouting filling pressure, through arrangement of the detection holes and the pressure judgment units, the pressure judgment range can be more accurately reduced, and therefore the situation that the filling effect cannot be achieved due to the fact that the grouting pressure is too small is avoided; and grouting material waste caused by too high grouting pressure can be avoided, effective treatment is achieved, and cost is saved.

Description

Technical Field

[0001] This invention relates to the field of grouting technology for formation fractures, specifically to a device for judging the grout filling pressure of primary fractures in deep formations and a method for judging the grouting pressure. Background Technology

[0002] In the process of mining deep coal seams (generally below 50 meters), in order to sever the hydraulic connection between the deep high-pressure aquifer and the coal-bearing strata in the treatment area, deep strata grouting treatment projects often adopt horizontal multi-branch drilling. The static pressure downward grouting method with hole sealing is often used to fill the strata fractures. By blocking the water-conducting channels through grouting, the water storage is reduced, thereby preventing catastrophic water hazard accidents at the coal mine working face and ensuring the safe mining of the working face.

[0003] Currently, due to differing understandings of deep stratum fracture development and filling effects, the standards for grouting termination pressure vary. This leads to inaccurate judgment of the grouting termination pressure range or excessive pressure range when grouting at different geological depths. Consequently, if the grouting termination pressure is too low, the filling and treatment effect will not be achieved; if the termination pressure is too high, grouting materials will be wasted. To address these issues, we have designed a grouting judgment device and a grouting pressure judgment method.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a device for judging the filling pressure of grout in deep formation primary fractures and a method for judging the grouting pressure thereon, so as to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a device for judging the filling pressure of grout in deep formation primary fractures, including grouting holes opened in the foundation, and further comprising: Grouting equipment is installed at the grouting hole and is used to perform grouting at different depths of the grouting hole. The grouting equipment is equipped with a pressure gauge to measure the pressure value in the grouting pipe inside the grouting equipment when the grouting equipment injects grout into the grouting hole. Multiple sets of detection holes are evenly distributed around the grouting hole; Multiple pressure judgment units are set in each of the detection holes to judge the grouting filling pressure.

[0006] Preferably, the pressure determination unit includes: The testing platform is erected on the foundation directly above the testing hole; A detection rod is installed in the detection platform and the detection hole. A rangefinder is installed at the end of the detection rod to measure the distance between the groundwater surface in the detection hole and the bottom of the detection rod. A power unit is disposed between the detection rod and the detection platform, and is used to drive the detection rod to move up and down relative to the detection platform.

[0007] Preferably, the power assembly includes: A sliding stage is slidably disposed on the detection stage; A power component is disposed between the detection stage and the sliding stage to provide power for the sliding stage to slide up and down; A first clamping member is disposed on the sliding table and is used to clamp the detection rod when the power member drives the sliding table to move up and down; A second clamping member is disposed on the detection platform and is used to clamp the detection rod when the first clamping member releases its grip on the detection rod.

[0008] Preferably, the detection stage and the sliding stage are provided with sliding holes for the detection rod to pass through.

[0009] Preferably, the first clamping member includes: Two sets of first clamping plates are symmetrically arranged on both sides of the detection rod; The first power unit is disposed on the detection platform and is used to drive the first clamping plate to slide so that the first clamping plate clamps the detection rod.

[0010] Preferably, the second clamping member includes: Two sets of second clamping plates are symmetrically arranged on both sides of the detection rod; The second power unit is disposed on the detection platform and is used to drive the first clamping plate to slide so that the first clamping plate clamps the detection rod.

[0011] A method for determining grouting pressure in deep formation primary fractures includes the following steps: Step 1: Move the grouting equipment to the grouting hole location and insert the grouting pipe into the grouting hole to the required grouting depth; Step 2: Drill test holes in a circular array around the grouting hole using drilling equipment. Then, use a power unit to extend a test rod with a rangefinder into the test hole until the end of the test rod is close to the water surface inside the test hole. Step 3: Grout into the grouting hole at this depth until the water level in the detection hole rises and then falls back down. Record the pressure value in the grouting pipe at this time, and use 0.5 MPa above or below this pressure value as the minimum pressure judgment range.

[0012] Compared with the prior art, the beneficial effects of the present invention are: By setting up detection holes and pressure judgment units, this invention can more accurately and narrow the range of pressure judgment, thereby avoiding the situation where the pressure grouting pressure is too low to achieve the filling effect, and also avoiding the situation where the grouting pressure is too high to cause waste of grouting materials, thus achieving effective treatment and saving costs. Attached Figure Description

[0013] Figure 1 This is a layout diagram of the pressure judgment unit of the present invention; Figure 2 This is a front cross-sectional view of the pressure judgment unit of the present invention inside the detection hole; Figure 3 This is an overall structural diagram of a single pressure detection unit of the present invention.

[0014] Reference numerals: 1-grouting hole; 2-detection hole; 3-pressure judgment unit; 31-detection platform; 32-detection rod; 33-sliding platform; 34-power component; 35-first clamping component; 351-first clamping plate; 352-first power unit; 36-second clamping component; 361-second clamping plate; 362-second power unit. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figure 1-3 The present invention provides a technical solution: a device for judging the filling pressure of grout in deep strata primary fractures, including a grouting hole 1 opened on the foundation, and further comprising: The grouting equipment is installed at the grouting hole 1 and is used to perform grouting at different depths in the grouting hole 1. The grouting equipment is equipped with a pressure gauge to measure the pressure value in the grouting pipe of the grouting equipment when the grouting equipment injects grout into the grouting hole 1. The grouting equipment uses a grouting pump of model F-260. Multiple sets of detection holes 2 are evenly distributed around the grouting hole 1, and their opening depth is the same as that of the grouting hole 1. Multiple pressure judgment units 3 are set in each of the detection holes 2 to judge the grouting filling pressure.

[0017] The pressure determination unit 3 includes: The testing platform 31 is erected on the foundation directly above the testing hole 2; A detection rod 32 is installed in the detection platform 31 and the detection hole 2. A rangefinder is installed at the end of the detection rod 32 to measure the distance between the groundwater surface in the detection hole 2 and the bottom of the detection rod 32. A power assembly is disposed between the detection rod 32 and the detection table 31, and is used to drive the detection rod 32 to move up and down relative to the detection table 31. When grouting cracks using grouting equipment, as the grout flows from grouting hole 1 to the crack, it squeezes and transfers the groundwater within the crack. Due to the grouting rate, the transferred groundwater cannot achieve equilibrium, thus forcing the water level in detection hole 2 to rise. Simultaneously, the pressure value of the pressure gauge in the grouting pipe increases due to the forced transfer of groundwater. When the cracks around grouting hole 1 are almost filled with grout (at this point, the speed at which the grout forces the groundwater to flow is basically the same as the speed of the groundwater flowing around the cracks), the water level in detection hole 2 will slowly decrease. The pressure value of the pressure gauge at this point is recorded as a standard, and the minimum pressure range for the end of grouting is defined as 0.5 MPa above or below this pressure value. In addition, during the rise of the water level in detection hole 2, the distance between the end of detection rod 32 and the groundwater surface is detected by the rangefinder at the end of detection rod 32. The distance measured by the rangefinder is used to control the power assembly to move detection rod 32 upward, so that the distance remains constant, thereby controlling the movement of detection rod 32. When the above grouting is almost completed, and the water level drops, the power assembly will drive detection rod 32 downward, with the pressure value at this moment being the standard pressure value.

[0018] Meanwhile, the power assembly includes: The sliding stage 33 is slidably disposed on the detection stage 31; A power component 34 is disposed between the detection table 31 and the sliding table 33 to provide power for the sliding table 33 to slide up and down. The power component 34 can be configured as an electric telescopic rod. The first clamping member 35 is disposed on the sliding table 33 and is used to clamp the detection rod 32 when the power member 34 drives the sliding table 33 to move up and down. The second clamping member 36 is disposed on the detection table 31 and is used to clamp the detection rod 32 when the first clamping member 35 releases its clamping of the detection rod 32; When the actual power component drives the detection rod 32 downward, the first clamping member 35 clamps the detection rod 32. Then, the power component 34 drives the sliding table 33 to move downward to the maximum distance and stops. Then, the second clamping member 36 clamps the detection rod 32. After that, the first clamping member 35 releases the clamp. When the power component 34 returns to the initial position, the first clamping member 35 re-clamps, and the second clamping member 36 releases. The above operation is repeated to realize the downward movement of the detection rod 32. When the detection rod 32 rises, the principle is the same. Since this detection is the filling of grout in the original fracture of the deep stratum, and since the distance between the detection hole 2 and the grouting hole 1 is relatively deep, the detection rod 32 cannot be simply lifted by lifting equipment. Therefore, the use of this power component can make the rising and falling more stable.

[0019] Meanwhile, the detection stage 31 and the sliding stage 33 are provided with sliding holes for the detection rod 32 to pass through, and the sliding holes also have the effect of limiting the sliding of the detection rod 32, making the sliding of the detection rod 32 more stable.

[0020] Additionally, the first clamping member 35 includes: Two sets of first clamping plates 351 are symmetrically arranged on both sides of the detection rod 32; The first power unit 352 is disposed on the detection table 31 and is used to drive the first clamping plate 351 to slide so that the first clamping plate 351 clamps the detection rod 32.

[0021] Finally, the second clamping member 36 includes: Two sets of second clamping plates 361 are symmetrically arranged on both sides of the detection rod 32; The second power unit 362 is disposed on the detection table 31 and is used to drive the first clamping plate 351 to slide so that the first clamping plate 351 clamps the detection rod 32. The first power unit 352 and the second power unit 362 can be configured as an electric telescopic rod; In addition, in order to achieve a longer length of the detection rod 32 to accommodate the depth of the detection hole 2, the detection rod 32 can be configured as a multi-segment type, with adjacent ends spliced ​​together by plugging.

[0022] Example 2 The difference between this embodiment and Embodiment 1 is that this embodiment also provides a method for determining the grouting pressure of primary fractures in deep formations, including the following steps: Step 1: Move the grouting equipment to the grouting hole 1 and insert the grouting pipe into the grouting hole 1 to the required grouting depth; Step 2: Drill inspection holes 2 in a circular array around the grouting hole 1 using drilling equipment. Then, use a power unit to extend the inspection rod 32 with a rangefinder into the inspection hole 2 until the end of the inspection rod 32 is close to the water surface inside the inspection hole 2. The distance between the end of the inspection rod 32 and the water surface is determined by the model of the rangefinder. Different rangefinders have different accuracies. This height is within the range that the rangefinder can accurately measure. Step 3: Grout into the grouting hole 1 at this depth until the water level in the detection hole 2 rises and then falls back down. Record the pressure value in the grouting pipe at this time, and use 0.5 MPa above or below this pressure value as the minimum pressure judgment range.

Claims

1. A device for judging the filling pressure of grout in deep strata primary fractures, comprising grouting holes (1) opened on the foundation, characterized in that, Also includes: Grouting equipment is installed at the grouting hole (1) and is used to perform grouting at different depths of the grouting hole (1). The grouting equipment is equipped with a pressure gauge to measure the pressure value in the grouting pipe of the grouting equipment when the grouting equipment injects grout into the grouting hole (1). Multiple sets of detection holes (2) are evenly distributed around the grouting hole (1); Multiple pressure judgment units (3) are set in each group of detection holes (2) for judging the grouting filling pressure.

2. The device for determining the filling pressure of primary fracture slurry in deep formations according to claim 1, characterized in that, The pressure determination unit (3) includes: The testing platform (31) is erected on the foundation directly above the testing hole (2); The detection rod (32) is set in the detection platform (31) and the detection hole (2). The end of the detection rod (32) is equipped with a rangefinder for measuring the distance between the water surface of the groundwater in the detection hole (2) and the bottom of the detection rod (32). A power unit is disposed between the detection rod (32) and the detection table (31) to drive the detection rod (32) to move up and down relative to the detection table (31).

3. The device for determining the filling pressure of primary fracture slurry in deep formations according to claim 2, characterized in that, The power assembly includes: A sliding stage (33) is slidably disposed on the detection stage (31); A power component (34) is disposed between the detection stage (31) and the sliding stage (33) to provide power for the sliding stage (33) to slide up and down; The first clamping member (35) is disposed on the sliding table (33) and is used to clamp the detection rod (32) when the power member (34) drives the sliding table (33) to move up and down; The second clamping member (36) is disposed on the detection table (31) and is used to clamp the detection rod (32) when the first clamping member (35) releases its clamping on the detection rod (32).

4. The device for determining the filling pressure of primary fracture slurry in deep formations according to claim 3, characterized in that, The detection stage (31) and the sliding stage (33) are provided with sliding holes for the detection rod (32) to pass through.

5. The device for determining the filling pressure of primary fracture slurry in deep formations according to claim 3, characterized in that, The first clamping member (35) includes: Two sets of first clamping plates (351) are symmetrically arranged on both sides of the detection rod (32); The first power unit (352) is disposed on the detection table (31) and is used to drive the first clamping plate (351) to slide so that the first clamping plate (351) clamps the detection rod (32).

6. The device for determining the filling pressure of primary fracture slurry in deep formations according to claim 3, characterized in that, The second clamping member (36) includes: Two sets of second clamping plates (361) are symmetrically arranged on both sides of the detection rod (32); The second power unit (362) is disposed on the detection table (31) and is used to drive the first clamping plate (351) to slide so that the first clamping plate (351) clamps the detection rod (32).

7. A method for determining the grouting pressure in deep formation primary fractures, using the grout filling pressure determination device for deep formation primary fractures as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Move the grouting equipment to the grouting hole (1) and insert the grouting pipe into the grouting hole (1) to the required grouting depth; Step 2: Drill holes (2) in a circular array around the grouting hole (1) using a drilling device. Then, insert the detection rod (32) with a rangefinder into the detection hole (2) using a power assembly until the end of the detection rod (32) is close to the water surface inside the detection hole (2). Step 3: Grout into the grouting hole (1) at this depth until the water level in the detection hole (2) rises and then falls, and record the pressure value in the grouting pipe at this time. Use 0.5 MPa above or below this pressure value as the minimum pressure judgment range.

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