Grouting structure for preventing deformation and dislocation of drill hole

Abstract

The utility model discloses a grouting structure capable of preventing a drill hole from being deformed and broken. The grouting structure comprises a surface casing, an intermediate casing, a grouting floral tube, a plugging tube and a flexible tube, the top end outside the intermediate casing is coaxially sleeved with a surface casing, the inner diameter of the surface casing is larger than the outer diameter of the intermediate casing, and the inner wall of the surface casing and the outer wall of the intermediate casing are fixed through cement paste pouring; a flexible pipe is coaxially arranged in the intermediate casing in a penetrating mode, the outer diameter of the flexible pipe is smaller than that of the intermediate casing, the flexible pipe and the intermediate casing are equal in length, and the inner wall of the bottom of the intermediate casing and the outer wall of the bottom of the flexible pipe are bonded and fixed through an adhesive. A grouting floral tube is arranged below the flexible tube, the center line of the flexible tube and the center line of the grouting floral tube are located on the same straight line, the inner diameter of the flexible tube is equal to the outer diameter of the grouting floral tube, and the top of the grouting floral tube is inserted into the flexible tube; and the bottom of the grouting floral tube is in threaded connection with a plugging tube.

Description

Technical field:

[0001] The utility model relates to the technical field of drilling grouting, in particular to a grouting structure for preventing drilling deformation and disconnection. Background technology:

[0002] During the coal mining process, the overlying rock strata on the coal seams are affected by mining, ground pressure, and the deadweight of the rocks. The overlying rock strata are deformed, causing ground subsidence, a drop in groundwater levels, and inducing geological disasters. The impact of the above problems can be effectively alleviated by implementing grouting and filling operations. Among them, drilling grouting is the last step of the grouting and filling operation, and plays a key role in the successful implementation of the grouting work.

[0003] However, the grouting drilling structure in the past had the following problems: during the coal mining process, the overlying rock strata of the coal seam are in motion for a long time, not only sinking in the vertical direction, but also tensile displacement in the horizontal direction. This will cause the constructed boreholes to deform and break, resulting in the grouting materials being unable to reach the designed layer. Moreover, if the fault position is close to the surface, the grouting materials will return to the surface or groundwater, seriously affecting the ecological environment. Utility model content:

[0004] The utility model aims to provide a grouting structure which can prevent the deformation and discontinuity of drilling holes.

[0005] The purpose of the utility model is implemented by the following technical solutions: a grouting structure for preventing deformation and dislocation of a drill hole, which comprises a surface casing, a technical casing, a grouting flower pipe, a plugging pipe and a flexible pipe; the surface casing is coaxially sleeved on the top end outside the technical casing, the inner diameter of the surface casing is larger than the outer diameter of the technical casing, and the inner wall of the surface casing is fixed to the outer wall of the technical casing by pouring cement slurry; the flexible pipe is coaxially passed through the technical casing, the outer diameter of the flexible pipe is smaller than the outer diameter of the technical casing and the two are of equal length, and the inner wall of the bottom of the technical casing is fixed to the outer wall of the bottom of the flexible pipe by adhesive; the grouting flower pipe is arranged below the flexible pipe, the center line of the flexible pipe is in the same straight line with the center line of the grouting flower pipe, the inner diameter of the flexible pipe is equal to the outer diameter of the grouting flower pipe, and the top of the grouting flower pipe is inserted into the flexible pipe; the plugging pipe is threadedly connected to the bottom of the grouting flower pipe.

[0006] Preferably, the flexible pipe uses a DN160 wire mesh skeleton hose.

[0007] Preferably, a plurality of holes are evenly opened on the tube wall of the grouting flower tube.

[0008] Preferably, the porosity of the grouting flower tube is greater than 15%.

[0009] Preferably, the bottom end of the grouting flower tube is provided with an external thread, the top end of the blocking tube is provided with an internal thread, and the bottom end of the blocking tube is sealed.

[0010] The advantages of the utility model are as follows: in order to prevent the collapse of the loose layer on the surface, the utility model arranges a surface casing in the first borehole to avoid the occurrence of borehole collapse; in order to prevent the slurry from entering the upper stratum, a technical casing is arranged in the secondary borehole to isolate the hydraulic connection between the upper stratum and the grouting layer; in order to prevent the borehole from collapsing in the grouting section, a grouting flower pipe is arranged in the tertiary borehole to serve as a connecting channel for injecting slurry into the underground space, and also plays a role in protecting the wall; in order to prevent the long-term grouting from eroding the bottom boundary rock layer, a blocking pipe is connected to the bottom of the grouting flower pipe in the tertiary borehole to block the bottom of the grouting flower pipe, avoid the slurry from eroding the bottom boundary rock layer for a long time, and protect the integrity of the bottom boundary rock layer of the grouting layer; a flexible pipe is arranged in the technical casing, and the flexible pipe can avoid the fault of the borehole by utilizing its own plastic deformation, thereby ensuring that the slurry can still reach the grouting layer and realizing continuous grouting operation. Description of the drawings:

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creativity and labor.

[0012] Figure 1 It is a structural schematic diagram of the utility model installed in a drilled hole.

[0013] Figure 2 It is a schematic diagram of the state of cement slurry pouring and fixing the surface casing after drilling once.

[0014] Figure 3 It is a schematic diagram of the state of the cement slurry pouring and fixing technical casing after secondary drilling.

[0015] Figure 4 This is a schematic diagram of the status of installing the grouting flower pipe and the plugging pipe after three drillings.

[0016] The components in the accompanying drawings are marked as follows: surface casing 1, technical casing 2, grouting flower pipe 3, hole 3.1, plugging pipe 4, flexible pipe 5, adhesive 6, primary drilling 7, secondary drilling 8, tertiary drilling 9, first gate valve 10, second gate valve 11. Specific implementation method:

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1-Figure 4 As shown, a grouting structure for preventing deformation and dislocation of a borehole comprises a surface casing 1, a technical casing 2, a grouting flower pipe 3, a plugging pipe 4 and a flexible pipe 5;

[0019] A surface casing 1 is coaxially sleeved at the top of the technical casing 2. The inner diameter of the surface casing 1 is larger than the outer diameter of the technical casing 2. The inner wall of the surface casing 1 and the outer wall of the technical casing 2 are fixed by pouring cement slurry. The surface casing 1 is mainly used to prevent the collapse of the loose layer on the surface and avoid the occurrence of hole collapse. The technical casing 2 is mainly used to isolate the hydraulic connection between the upper stratum and the grouting layer to prevent the slurry from entering the upper stratum.

[0020] A flexible tube 5 is coaxially penetrated in the technical casing 2. The flexible tube 5 uses a DN160 wire mesh skeleton hose with a compressive strength greater than 7 MPa. The outer diameter of the flexible tube 5 is smaller than the outer diameter of the technical casing 2 and the two are of equal length. The inner wall at the bottom of the technical casing 2 and the outer wall at the bottom of the flexible tube 5 are bonded and fixed by an adhesive 6. The adhesive 6 uses epoxy resin AB glue. The gap between the technical casing 2 and the flexible tube 5 is blocked by the adhesive 6 to prevent the slurry in the grouting layer from passing through the gap and causing slurry backflow. The flexible tube 5 only undergoes plastic deformation. When the borehole is deformed by the movement of the rock formation, the technical casing 2 is in rigid contact with the formation, which is very easy to occur. The flexible pipe 5 can avoid the occurrence of misalignment in the drilling hole by utilizing its own plastic deformation, ensuring that the slurry can still reach the grouting layer, and realizing continuous grouting operation; a grouting flower pipe 3 is provided below the flexible pipe 5, and a plurality of holes 3.1 are evenly opened on the pipe wall of the grouting flower pipe 3, the porosity of the grouting flower pipe 3 is greater than 15%, the center line of the flexible pipe 5 is in the same straight line as the center line of the grouting flower pipe 3, the inner diameter of the flexible pipe 5 is equal to the outer diameter of the grouting flower pipe 3, and the top of the grouting flower pipe 3 is plugged into the flexible pipe 5, the grouting flower pipe 3 serves as a connecting channel for the slurry to be injected into the underground space, and also plays a role in protecting the wall, preventing the collapse of the drilling hole in the grouting section;

[0021] The bottom end of the grouting flower tube 3 is provided with an external thread, and the top end of the sealing tube 4 is provided with an internal thread. The sealing tube 4 is threadedly connected to the bottom of the grouting flower tube 3. The inner diameter of the sealing tube 4 is equal to the inner diameter of the grouting flower tube 3. The bottom end of the sealing tube 4 is sealed. The sealing tube 4 is mainly used to seal the bottom of the grouting flower tube 3 to prevent long-term grouting from eroding the bottom boundary rock layer and protect the integrity of the bottom boundary rock layer of the grouting layer.

[0022] Installation steps: First, Figure 2 As shown, after drilling a hole 7 for the first time and seeing the bedrock for 10m, a φ273*7mm spiral casing is lowered as the surface casing 1, and cement slurry is poured into the annular gap between the outer wall of the surface casing 1 and the inner wall of the borehole to the orifice of the first borehole 7 to prevent the grouting from entering the upper stratum along the annular gap from the orifice, and at the same time, the surface casing 1 is fixed; a first gate valve 10 is installed at the top opening of the surface casing 1 to prevent the slurry at other positions in the grouting layer from passing through the surface casing 1 and returning to the surface;

[0023] Second, open the top opening of the first gate valve 10, complete the secondary drilling 8, and determine the top boundary of the grouting layer by segmented core sampling as required. Drill the secondary hole 8 to the top boundary of the grouting layer, and lower the technical casing 2 of J55 material and φ177.8*8 into the hole. Pour cement slurry between the inner wall of the surface casing 1 and the outer wall of the technical casing 2 to the orifice of the secondary drilling hole 8 to prevent the grouting from entering the upper stratum along the inner wall of the surface casing 1 and the outer wall of the technical casing 2. At the same time, fix the technical casing 2. After fixing, check the pouring quality by sound amplitude, such as Figure 3 As shown, the first gate valve 10 is removed, and a second gate valve 11 is installed at the top opening of the technical casing 2 to prevent slurry at other positions in the grouting layer from flowing up through the technical casing 2 and causing slurry backflow;

[0024] Third, if Figure 4 As shown, open the top opening of the second gate valve 11, complete the three drillings 9, lower the grouting flower pipe 3 with a diameter of 139 mm and a plugging pipe 4 connected to the bottom into the hole, and insert the top of the grouting flower pipe 3 into the technical casing 2;

[0025] Fourth, apply epoxy resin A glue on the outer wall of the bottom of the flexible tube 5 along the circumferential direction, lower the flexible tube 5 into the technical sleeve 2, and put the bottom of the flexible tube 5 on the top of the grouting flower tube 3. Inject epoxy resin B glue between the outer wall of the flexible tube 5 and the inner wall of the technical sleeve 2, and fix the flexible tube 5 with epoxy resin AB glue. At the same time, seal the bottom between the outer wall of the flexible tube 5 and the inner wall of the technical sleeve 2 to prevent slurry from flowing up during grouting.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A grouting structure for preventing deformation and discontinuity of drilling, characterized in that: It includes a surface casing, a technical casing, a grouting flower pipe, a plugging pipe and a flexible pipe; the surface casing is coaxially sleeved on the top end outside the technical casing, the inner diameter of the surface casing is larger than the outer diameter of the technical casing, and the inner wall of the surface casing and the outer wall of the technical casing are fixed by pouring cement slurry; the flexible pipe is coaxially passed through the technical casing, the outer diameter of the flexible pipe is smaller than the outer diameter of the technical casing and the two are of equal length, and the inner wall of the bottom of the technical casing and the outer wall of the bottom of the flexible pipe are fixed by adhesive; the grouting flower pipe is arranged below the flexible pipe, the center line of the flexible pipe is in the same straight line with the center line of the grouting flower pipe, the inner diameter of the flexible pipe is equal to the outer diameter of the grouting flower pipe, and the top of the grouting flower pipe is inserted into the flexible pipe; the plugging pipe is threadedly connected to the bottom of the grouting flower pipe.

2. A grouting structure for preventing drilling deformation and discontinuity according to claim 1, characterized in that: The flexible pipe uses a DN160 wire mesh skeleton hose.

3. A grouting structure for preventing drilling deformation and discontinuity according to claim 1 or 2, characterized in that: A plurality of holes are evenly opened on the tube wall of the grouting flower tube.

4. A grouting structure for preventing drilling deformation and discontinuity according to claim 3, characterized in that: The porosity of the grouting flower tube is greater than 15%.

5. A grouting structure for preventing drilling deformation and discontinuity according to claim 1, characterized in that: The bottom end of the grouting flower tube is provided with an external thread, the top end of the blocking tube is provided with an internal thread, and the bottom end of the blocking tube is airtightly arranged.

Images