A point segment mechanical grouting device for in-hole fracture zone

Abstract

The present application relates to the technical field of geological engineering facilities, and particularly relates to a fixed-point segmented mechanical grouting device for a broken zone in a hole. The present application comprises a replaceable grouting section, a lower partition air bag mechanism is threadedly connected to the bottom end of the replaceable grouting section, an upper partition air bag mechanism is threadedly connected to the top end of the replaceable grouting section, slurry outlet holes are uniformly formed in the outer wall of the replaceable grouting section, and a high-elasticity winding belt is arranged on the outer wall of the replaceable grouting section, a lengthened pipe is threadedly connected to the top end of the upper partition air bag mechanism, and a hollow cavity is formed in the lengthened pipe. The present application uses an independent gas conveying inner passage to completely separate the gas slurry, and cooperates with the upper and lower composite structure air bag and the replaceable grouting section to form a rigid fixed-distance closed grouting area, which is tightly sealed and has no risk of cross-flowing, and the air bag adopts a composite structure of a sealed rubber inner layer, a fiber reinforced middle layer and a wear-resistant protective outer layer, so that the pressure bearing and damage resistance are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of geological engineering facilities technology, specifically a fixed-point segmented mechanical grouting device for fractured zones inside boreholes. Background Technology

[0002] In geotechnical drilling and anchoring construction, whether it's slope anchor holes or geological exploration boreholes, the borehole wall is prone to collapse when traversing unfavorable geological sections such as fractured rock masses, weak interlayers, and weathered fracture zones, resulting in borehole collapse. Borehole collapse can lead to problems such as stuck drill bits and buried drill bits, and may also prevent the anchor bolts from being lowered smoothly, requiring repeated hole cleaning or even re-drilling. For anchor bolt holes, it can also cause a large amount of grout to be lost into the fissures during subsequent grouting, significantly reducing the density of the anchoring section and failing to meet design requirements for anchoring force. For exploration boreholes, especially during borehole pressure testing, pre-consolidation grouting treatment of the fractured zone is also necessary to form a relatively complete water-stopping plug section. In current engineering practice, the conventional treatment for the above problems is often a one-time full-hole grouting or full-hole cement grout consolidation, for example, full-hole grouting in anchor bolt holes, and full-hole casing protection or full-hole cement grout sealing in exploration boreholes.

[0003] These methods share the following common problems: First, they cannot accurately identify and reinforce only the fractured zone, resulting in high grout consumption and unnecessary pollution or blockage of other normal strata within the borehole. Second, existing segmented grouting devices mostly rely on gravity-triggered opening and closing and sealing structures, making them unsuitable for inclined or near-horizontal boreholes such as anchor bolt holes, thus limiting their applicability. Third, conventional segmented grouting devices generally employ complex valve components such as built-in valve cores and springs, which can easily cause blockage by cement particles in the grout, leading to a high failure rate. Furthermore, the sealing airbags are mostly single-layer rubber structures, which have weak resistance to wear and puncture in the sharp rock debris environment of the fractured borehole wall, making them prone to rupture and leakage, resulting in sealing failure. Additionally, existing devices are mostly fixed integrated structures, making modular adjustments impossible based on the actual length of the fractured zone and the borehole depth. Moreover, the gas-grout channels are often shared or poorly isolated, easily leading to grout backflow, solidification, and blockage of the air channels, rendering the device unusable.

[0004] In summary, there is an urgent need for a device that can adapt to various types of boreholes and perform targeted, segmented mechanical grouting of fractured zones within the borehole, in order to achieve precise reinforcement, prevent borehole collapse, and ensure construction quality and efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a fixed-point segmented mechanical grouting device for fractured zones inside holes, so as to solve the problems of the prior art mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A fixed-point segmented mechanical grouting device for fracture zones inside holes includes a replaceable grouting section. The bottom end of the replaceable grouting section is threadedly connected to a lower isolation airbag mechanism, and the top end of the replaceable grouting section is threadedly connected to an upper isolation airbag mechanism. Grout outlet holes are evenly opened on the outer wall of the replaceable grouting section, and a highly elastic winding strip is provided on the outer wall of the replaceable grouting section. The top end of the upper isolation airbag mechanism is threadedly connected to an extension tube, and a hollow cavity is opened inside the extension tube.

[0007] As a further technical solution of the present invention, a hollow cavity is provided in the replaceable grouting section, a lower sealing plate is fixedly connected to the bottom end of the hollow cavity, an upper sealing plate is fixedly connected to the top end of the hollow cavity, and an air supply channel is provided in the inner wall of one side of the hollow cavity.

[0008] As a further technical solution of the present invention, the top end of the gas transmission inner channel is provided with an air inlet connection port, which is located on the upper sealing plate, and the bottom end of the gas transmission inner channel is provided with an air outlet, which is located on the lower sealing plate.

[0009] As a further technical solution of the present invention, the upper sealing plate is provided with a pressure connection port and a grouting connection port.

[0010] As a further technical solution of the present invention, the lower partition airbag mechanism includes a lower connecting pipe, an inner cavity, a first upper threaded mounting end, a first lower threaded mounting end, a lower air chamber, a lower airbag, a first upper and lower connecting rings, a first clamping ring, and a ventilation groove. The upper end of the outer wall of the lower connecting pipe is provided with a first upper threaded mounting end, and the lower end of the outer wall of the lower connecting pipe is provided with a first lower threaded mounting end. A lower air chamber is provided between the first upper threaded mounting end and the first lower threaded mounting end, and a lower airbag is provided on the outer side of the lower air chamber.

[0011] As a further technical solution of the present invention, the upper and lower ends of the lower airbag are provided with first upper and lower connecting rings on the outer walls corresponding to the first upper threaded mounting end and the first lower threaded mounting end, respectively. A first clamping ring is provided on the outer side of the first upper and lower connecting rings. A ventilation groove is provided on the lower air chamber. A detachable conical head is threaded to the bottom end of the lower connecting pipe. A sealing rubber inner layer is provided on the inner side of the lower airbag. A fiber-reinforced middle layer is provided on the outer surface of the sealing rubber inner layer. A wear-resistant protective outer layer is provided on the outer surface of the fiber-reinforced middle layer.

[0012] As a further technical solution of the present invention, the upper partition airbag mechanism includes an upper connecting pipe, a through cavity, a second upper threaded mounting end, an upper air cavity, an internal ventilation channel, a ventilation connection port, an upper airbag, a second upper and lower connecting ring, a second clamping ring, and a second lower threaded mounting end, wherein a through cavity is provided inside the upper connecting pipe.

[0013] As a further technical solution of the present invention, the top end of the upper connecting pipe is provided with a second upper threaded mounting end, the bottom end of the upper connecting pipe is provided with a second lower threaded mounting end, and an upper air chamber is formed between the second upper threaded mounting end and the second lower threaded mounting end.

[0014] As a further technical solution of the present invention, an internal ventilation channel is provided between the inner wall of one side of the through cavity and the upper air cavity, and an air connection port is provided on the internal ventilation channel. An upper air bladder is provided on the upper air cavity, and a sealing rubber inner layer is provided on the inner side of the upper air bladder. A fiber-reinforced middle layer is provided on the outer surface of the sealing rubber inner layer, and a wear-resistant protective outer layer is provided on the outer surface of the fiber-reinforced middle layer.

[0015] As a further technical solution of the present invention, the upper and lower ends of the upper airbag are provided with second upper and lower connecting rings on the outer walls of the second upper threaded mounting end and the second lower threaded mounting end, and a second clamping ring is provided on the outer side of the second upper and lower connecting rings.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses an independent internal gas delivery channel to achieve complete separation of gas and slurry. Combined with the upper and lower composite structure airbags and replaceable grouting sections, it forms a rigid, fixed-distance, closed grouting zone. The seal is tight and there is no risk of crossflow. The airbag adopts a composite structure of a sealing rubber inner layer, a fiber-reinforced middle layer, and a wear-resistant protective outer layer, which greatly improves the pressure resistance and damage resistance. 2. This invention abandons the traditional valve structure and adopts a valveless self-sealing system composed of a slurry outlet and a high-elasticity winding tape. It relies on slurry pressure to automatically open and close, and pressure relief and rebound sealing to completely eliminate the problem of slurry blockage. 3. This invention is gravity-free throughout the entire process, and can stably and reliably achieve sealing and precise grout discharge in inclined, near-horizontal anchor holes and boreholes at various angles; 4. The present invention adopts a combination structure of replaceable grouting section and threaded splicing extended pipe, which can be flexibly adjusted according to the length of the crushing section and the hole depth to adapt to different hole diameters and working conditions, and the reusability and versatility of the device are significantly enhanced. 5. The detachable conical head of this invention has a guiding and anti-jamming function. It is a purely mechanical structure without precision electronic control components, making it easy to assemble and disassemble, durable and easy to maintain, and suitable for complex field construction scenarios. 6. This invention enables targeted and quantitative grouting in fractured sections, effectively improving the density of the anchoring section and the anchor bolt gripping force, reducing grout loss, significantly improving the construction quality and work efficiency of slope anchoring projects, and reducing overall construction costs. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded view of the three-dimensional structure of the present invention; Figure 3 This is an exploded cross-sectional view of the replaceable grouting section of the present invention. Figure 4 This is an exploded three-dimensional view of the lower partition airbag mechanism of the present invention; Figure 5 This is an exploded three-dimensional cross-sectional view of the upper partition airbag mechanism of the present invention. Figure 6 This is a top-view cross-sectional view of the airbag structure of the present invention.

[0018] In the diagram: 1-Replaceable grouting section; 2-Grouting outlet; 3-Hollow cavity; 4-Lower sealing plate; 5-Upper sealing plate; 6-Inner air supply channel; 7-Air inlet connection; 8-Air outlet; 9-Pressure connection; 10-Grouting connection; 11-High-elasticity winding tape; 12-Lower partition airbag mechanism; 1201-Lower connecting pipe; 1202-Inner cavity; 1203-First upper threaded mounting end; 1204-First lower threaded mounting end; 1205-Lower air cavity; 1206-Lower airbag; 1207-First upper and lower connecting rings; 1208-First clamping ring; 1209 - Ventilation groove; 13 - Detachable conical head; 14 - Upper partition airbag mechanism; 1401 - Upper connecting pipe; 1402 - Through cavity; 1403 - Second upper threaded mounting end; 1404 - Upper air chamber; 1405 - Inner wall ventilation channel; 1406 - Ventilation connection port; 1407 - Upper airbag; 1408 - Second upper and lower connecting rings; 1409 - Second clamping ring; 1410 - Second lower threaded mounting end; 15 - Extension tube; 16 - Hollow cavity; 17 - Wear-resistant protective outer layer; 18 - Fiber-reinforced middle layer; 19 - Sealing rubber inner layer. Detailed Implementation

[0019] 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.

[0020] Please see the appendix Figure 1 - Appendix Figure 6The present invention provides an embodiment of a fixed-point segmented mechanical grouting device for a broken zone inside a hole, comprising a replaceable grouting section 1, a lower isolation airbag mechanism 12 threadedly connected to the bottom end of the replaceable grouting section 1, an upper isolation airbag mechanism 14 threadedly connected to the top end of the replaceable grouting section 1, grout outlet holes 2 uniformly opened on the outer wall of the replaceable grouting section 1, and a highly elastic winding band 11 provided on the outer wall of the replaceable grouting section 1, and an extension tube 15 threadedly connected to the top end of the upper isolation airbag mechanism 14, with a hollow cavity 16 opened inside the extension tube 15; this structure achieves complete separation of air and grout through an independent internal air supply channel, and the upper and lower composite structure airbags of the upper isolation airbag mechanism 14 and the lower isolation airbag mechanism 12 together with the replaceable grouting section 1 form a rigid fixed-distance closed grouting zone, which is tightly sealed and has no risk of crossflow; The replaceable grouting section 1 has a hollow cavity 3. The bottom end of the hollow cavity 3 is fixedly connected to a lower sealing plate 4, and the top end of the hollow cavity 3 is fixedly connected to an upper sealing plate 5. An internal air supply channel 6 is opened in the inner wall of one side of the hollow cavity 3. The internal air supply channel 6 is an independent air supply channel of the lower partition airbag mechanism 12, which is completely separated from the slurry channel and pressurization channel in the hollow cavity 3 and does not cross-flow. An air inlet 7 is provided at the top of the air supply channel 6 and is located on the upper sealing plate 5. An air outlet 8 is provided at the bottom of the air supply channel 6 and is located on the lower sealing plate 4. The air inlet 7 is used to connect to an external inflation air source. The air outlet 8 is connected to the inner cavity 1202 of the lower partition airbag mechanism 12 to form a complete inflation passage for the lower airbag 1206. The upper sealing plate 5 is provided with a pressure connection port 9 and a grouting connection port 10. The pressure connection port 9 is used to apply grouting pressure to the grout in the hollow cavity 3, and the grouting connection port 10 is used for the injection of cement grout. The two are set up independently and each performs its own function. The lower partition airbag mechanism 12 includes a lower connecting pipe 1201, an inner cavity 1202, a first upper threaded mounting end 1203, a first lower threaded mounting end 1204, a lower air chamber 1205, a lower airbag 1206, a first upper and lower connecting ring 1207, a first clamping ring 1208, and a venting groove 1209. The upper end of the outer wall of the lower connecting pipe 1201 is provided with the first upper threaded mounting end 1203, and the lower end of the outer wall of the lower connecting pipe 1201 is provided with the first lower threaded mounting end 1204. The lower air chamber 1205 is provided between the first upper threaded mounting end 1203 and the first lower threaded mounting end 1204. The lower airbag 1206 is provided on the outside of the lower air chamber 1205. The venting groove 1209 connects the inner cavity 1202 and the lower air chamber 1205, so that gas can be smoothly filled into the lower airbag 1206 to achieve the expansion and sealing of the lower airbag 1206. The lower airbag 1206 has a first upper and lower connecting ring 1207 on the outer wall of the first upper threaded mounting end 1203 and the first lower threaded mounting end 1204 at both ends. A first clamping ring 1208 is provided on the outer side of the first upper and lower connecting ring 1207. A ventilation groove 1209 is provided on the lower air chamber 1205. A detachable conical head 13 is threaded to the bottom end of the lower connecting pipe 1201. A sealing rubber inner layer 19 is provided on the inner side of the lower airbag 1206. A fiber-reinforced middle layer 18 is provided on the outer surface of the sealing rubber inner layer 19. A wear-resistant protective outer layer 17 is provided on the outer surface of the fiber-reinforced middle layer 18. The three-layer composite structure can improve the sealing performance, pressure bearing strength and wear resistance of the lower airbag 1206. The first clamping ring 1208 can lock the lower airbag 1206 to prevent air leakage. The detachable conical head 13 is used for guidance and anti-jamming when the device is lowered into the hole. The upper partition airbag mechanism 14 includes an upper connecting pipe 1401, a through cavity 1402, a second upper threaded mounting end 1403, an upper air cavity 1404, an inner wall ventilation channel 1405, a ventilation connection port 1406, an upper airbag 1407, a second upper and lower connecting ring 1408, a second clamping ring 1409, and a second lower threaded mounting end 1410. The upper connecting pipe 1401 has a through cavity 1402, which is connected to the hollow cavity 3 of the replaceable grouting section 1 to ensure grout flow and pressure transmission. The inner wall ventilation channel 1405 is an independent inflation channel for the upper airbag 1407. The upper connecting pipe 1401 is provided with a second upper threaded mounting end 1403 at its top end and a second lower threaded mounting end 1410 at its bottom end. An upper air chamber 1404 is provided between the second upper threaded mounting end 1403 and the second lower threaded mounting end 1410. The upper air chamber 1404 is used to contain the inflation gas, providing space for the upper airbag 1407 to expand, and achieving a tight fit and seal between the upper airbag 1407 and the hole wall. An internal ventilation channel 1405 is provided between the inner wall of one side of the through cavity 1402 and the upper air cavity 1404. An air connection port 1406 is provided on the internal ventilation channel 1405. An upper airbag 1407 is provided on the upper air cavity 1404. A sealing rubber inner layer 19 is provided on the inner side of the upper airbag 1407. A fiber-reinforced middle layer 18 is provided on the outer surface of the sealing rubber inner layer 19. A wear-resistant protective outer layer 17 is provided on the outer surface of the fiber-reinforced middle layer 18. The air connection port 1406 connects the internal ventilation channel 1405 and the upper air cavity 1404, forming an independent inflation passage for the upper airbag 1407. The three-layer composite structure simultaneously improves the durability and sealing reliability of the upper airbag 1407. The upper and lower ends of the upper airbag 1407 are provided with second upper and lower connecting rings 1408 on the outer walls of the second upper threaded mounting end 1403 and the second lower threaded mounting end 1410, respectively. A second clamping ring 1409 is provided on the outer side of the second upper and lower connecting rings 1408. The second clamping ring 1409 is used to lock the two ends of the upper airbag 1407 to prevent displacement and air leakage during inflation, and to form a closed grouting section with a fixed length in conjunction with the lower airbag 1206.

Claims

1. A point-by-point sectional mechanical grouting device for a fracture zone in a borehole, characterized by: It includes a replaceable grouting section (1), the bottom end of which is threadedly connected to a lower partition airbag mechanism (12), the top end of which is threadedly connected to an upper partition airbag mechanism (14), the outer wall of which is uniformly provided with grout outlet holes (2), and the outer wall of which is provided with a high elastic winding band (11), the top end of which is threadedly connected to an extension tube (15), and the extension tube (15) is provided with a hollow cavity (16).

2. A point and section mechanical grouting device for a fracture zone in a borehole according to claim 1, characterized in that: The replaceable grouting section (1) has a hollow cavity (3) inside. The bottom end of the hollow cavity (3) is fixedly connected to a lower sealing plate (4), and the top end of the hollow cavity (3) is fixedly connected to an upper sealing plate (5). An internal gas transmission channel (6) is opened in the inner wall of one side of the hollow cavity (3).

3. A point and section mechanical grouting device for a fracture zone in a borehole according to claim 2, characterized in that: The top end of the gas transmission inner channel (6) is provided with an air inlet (7), and the air inlet (7) is located on the upper sealing plate (5). The bottom end of the gas transmission inner channel (6) is provided with an air outlet (8), and the air outlet (8) is located on the lower sealing plate (4).

4. The point-by-point sectional mechanical grouting device for a fracture zone in a borehole according to claim 3, characterized in that: The upper sealing plate (5) is provided with a pressure connection port (9) and a grouting connection port (10).

5. A fixed-point segmented mechanical grouting device for fractured zones within boreholes according to claim 1, characterized in that: The lower partition airbag mechanism (12) includes a lower connecting pipe (1201), an inner cavity (1202), a first upper threaded mounting end (1203), a first lower threaded mounting end (1204), a lower air chamber (1205), a lower airbag (1206), a first upper and lower connecting ring (1207), a first clamping ring (1208), and a ventilation groove (1209). The upper end of the outer wall of the lower connecting pipe (1201) is provided with the first upper threaded mounting end (1203), the lower end of the outer wall of the lower connecting pipe (1201) is provided with the first lower threaded mounting end (1203), the lower air chamber (1205) is provided between the first upper threaded mounting end (1203) and the first lower threaded mounting end (1204), and the lower airbag (1206) is provided on the outside of the lower air chamber (1205).

6. A fixed-point segmented mechanical grouting device for fractured zones within holes according to claim 5, characterized in that: The lower airbag (1206) has a first upper and lower connecting ring (1207) on the outer wall of the first upper threaded mounting end (1203) and the first lower threaded mounting end (1204) respectively. A first clamping ring (1208) is provided on the outer side of the first upper and lower connecting ring (1207). A ventilation groove (1209) is provided on the lower air chamber (1205). A detachable conical head (13) is threaded to the bottom end of the lower connecting pipe (1201). A sealing rubber inner layer (19) is provided on the inner side of the lower airbag (1206). A fiber-reinforced middle layer (18) is provided on the outer surface of the sealing rubber inner layer (19). A wear-resistant protective outer layer (17) is provided on the outer surface of the fiber-reinforced middle layer (18).

7. A fixed-point segmented mechanical grouting device for fractured zones within boreholes according to claim 1, characterized in that: The upper partition airbag mechanism (14) includes an upper connecting pipe (1401), a through cavity (1402), a second upper threaded mounting end (1403), an upper air cavity (1404), an internal ventilation channel (1405), a ventilation connection port (1406), an upper airbag (1407), a second upper and lower connecting ring (1408), a second clamping ring (1409), and a second lower threaded mounting end (1410). The through cavity (1402) is provided inside the upper connecting pipe (1401).

8. A fixed-point segmented mechanical grouting device for fractured zones within holes according to claim 7, characterized in that: The upper connecting pipe (1401) is provided with a second upper threaded mounting end (1403) at its top end and a second lower threaded mounting end (1410) at its bottom end. An upper air chamber (1404) is provided between the second upper threaded mounting end (1403) and the second lower threaded mounting end (1410).

9. A fixed-point segmented mechanical grouting device for fractured zones within holes according to claim 7, characterized in that: An internal ventilation channel (1405) is provided between one side of the inner wall of the through cavity (1402) and the upper air cavity (1404). An air connection port (1406) is provided on the internal ventilation channel (1405). An upper airbag (1407) is provided on the upper air cavity (1404). A sealing rubber inner layer (19) is provided on the inner side of the upper airbag (1407). A fiber-reinforced middle layer (18) is provided on the outer surface of the sealing rubber inner layer (19). A wear-resistant protective outer layer (17) is provided on the outer surface of the fiber-reinforced middle layer (18).

10. A fixed-point segmented mechanical grouting device for fractured zones within boreholes according to claim 7, characterized in that: The upper and lower ends of the upper airbag (1407) are provided with second upper and lower connecting rings (1408) on the outer walls of the second upper threaded mounting end (1403) and the second lower threaded mounting end (1410), and a second clamping ring (1409) is provided on the outer side of the second upper and lower connecting rings (1408).

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