A deep overburden high pressure jet grouting borehole enlarging device

Abstract

The application discloses a deep overburden high-pressure rotary jet drilling and diameter expanding equipment, which comprises a lifting assembly, an inner cylinder arranged on the lifting assembly, a through-type soil discharge hole arranged on the inner cylinder, an annular groove arranged on the side of the inner cylinder, a water delivery hole arranged in the inner cylinder and having a water outlet arranged in the annular groove, a high-pressure water pipe with an output end inserted into the inner cylinder and connected with a water inlet of the water delivery hole, a cutter head assembly arranged at one end of the inner cylinder away from the lifting assembly and close to the soil discharge hole, an outer cylinder sleeved on the outer periphery of the inner cylinder, a water spraying hole arranged on the side of the outer cylinder and corresponding to the annular groove, and a first driving assembly arranged on the inner cylinder and connected with the outer cylinder. The equipment does not need to be taken out of the hole to replace the high-pressure rotary jet equipment after drilling is completed, and can sequentially complete drilling and high-pressure water cutting operation in one drilling process, thereby avoiding time loss caused by frequent replacement of equipment and repeated drilling and downhole operation in the traditional construction mode, and greatly shortening the construction period of deep overburden drilling and diameter expanding.

Description

Technical Field

[0001] This invention relates to the field of construction engineering equipment technology, and in particular to a high-pressure jet grouting borehole enlargement device for deep overburden layers. Background Technology

[0002] In geotechnical engineering construction, when drilling pile foundations in deep overburden strata, a spiral drilling rig is typically used for initial drilling. After the borehole is formed, the spiral drilling rig is removed from the hole, casing is installed, and a high-pressure jet grouting system is installed and lowered into the hole. The high-pressure water jet from the jet grouting system cuts the soil on the inner wall of the borehole, breaking up and loosening the soil around the borehole wall, making it easier to mix with cement grout to form a stable load-bearing pile foundation. Because this method requires changing drilling and jet grouting equipment repeatedly when constructing multiple pile foundation holes, it results in long construction time and low efficiency.

[0003] Therefore, the existing technology still needs to be improved and enhanced. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-pressure jet grouting borehole enlargement device for deep overburden strata, which aims to solve the problem that the existing technology requires time-consuming switching between drilling equipment and high-pressure jet grouting equipment when performing pile foundation drilling operations in deep overburden strata, resulting in low construction efficiency.

[0005] The technical solution adopted by this invention to solve the technical problem is as follows: In a first aspect, embodiments of the present invention provide a high-pressure jet grouting borehole enlargement device for deep overburden layers, comprising: Lifting components, An inner cylinder is mounted on the lifting assembly for lifting. Along the lifting direction of the inner cylinder, a through-hole for discharging soil is provided on the inner cylinder. An annular groove is provided on the side periphery of the inner cylinder. A water inlet is provided inside the inner cylinder, and the outlet of the water inlet is located in the annular groove. A high-pressure water pipe, the output end of which extends into the inner cylinder and is connected to the inlet of the water delivery hole; The cutter head assembly is located at the end of the inner cylinder away from the lifting assembly and close to the soil discharge hole; An outer cylinder is fitted around the outer periphery of the inner cylinder, and the side of the outer cylinder is provided with a water spray hole corresponding to the annular groove; A first drive assembly is disposed on the inner cylinder and connected to the outer cylinder to drive the outer cylinder to rotate and spray water through the spray hole for high-pressure water cutting.

[0006] As a further improved technical solution, the aforementioned high-pressure jet grouting borehole enlargement equipment for deep overburden layers also includes: A high-pressure cement grout pipe; along the lifting direction of the inner cylinder, the inner cylinder has multiple annular grooves on its side circumference, and the inner cylinder also has grout delivery holes. The water outlet of the water delivery hole and the grout outlet of the grout delivery hole are respectively set in each of the annular grooves and correspond one-to-one; the output end of the high-pressure cement grout pipe extends into the inner cylinder and is connected to the grout inlet of the grout delivery hole; the outer cylinder also has spray holes on its side, and the water spray holes and the spray holes correspond one-to-one with each of the annular grooves.

[0007] As a further improved technical solution, the aforementioned high-pressure jet grouting borehole enlargement equipment for deep overburden layers also includes: A high-pressure air pipe, one end of which extends into the inner cylinder and has multiple output ends, each of which is connected to the water inlet and the slurry inlet respectively.

[0008] As a further improved technical solution, the distance between the spray hole and the cutter head is smaller than the distance between the water spray hole and the cutter head.

[0009] As a further improved technical solution, the end of the inner cylinder connected to the lifting assembly is shaped like a frustum, and the end of the soil discharge hole away from the cutter head is located on the frustum-shaped outer wall of the inner cylinder; along the lifting direction of the inner cylinder, the distance between the end of the soil discharge hole away from the cutter head and the lifting assembly is smaller than the distance between the water spray hole and the lifting assembly.

[0010] As a further improved technical solution, the aforementioned high-pressure jet grouting borehole enlargement equipment for deep overburden layers also includes: A sealing ring; along the circumference of the inner cylinder, the sealing ring is sleeved on the inner cylinder, and the sealing ring is respectively provided between each of the annular grooves, and the inner wall of the outer cylinder abuts against the outer side of the sealing ring.

[0011] As a further improved technical solution, the first driving component includes: The first motor is provided in the mounting groove on the side wall of the inner cylinder. The gear has an annular rack on the inner wall of the outer cylinder along the circumference. The gear is connected to the shaft of the first motor and meshes with the annular rack to drive the outer cylinder to rotate around the inner cylinder.

[0012] As a further improved technical solution, the cutter head assembly includes: The second motor has a through-hole in the inner cylinder along its lifting direction. One end of the through-hole is fitted onto the lifting assembly and fixed to each other. The output ends of the high-pressure water pipe, the high-pressure cement slurry pipe, and the high-pressure air pipe all extend into the through-hole. The water inlet and the slurry inlet are connected to the through-hole. The second motor is installed inside the through-hole. A rotating drum is disposed inside the other end of the sleeve hole, with one end connected to the shaft of the first motor and the other end extending out of the sleeve hole; The blades are provided in multiple pieces and are evenly spaced and arranged in a ring around the other end of the rotating drum, with each blade close to the soil discharge hole.

[0013] As a further improved technical solution, the lifting assembly includes: A frame, which is mounted on the ground; A third motor, which is mounted on the frame; A turbine, which is mounted on the shaft of the third motor; A worm gear meshes with a turbine to be lifted and lowered by the turbine. One end of the sleeve hole is fitted onto one end of the worm gear and fixed to it. The worm gear has a hollow pipe along its length. A high-pressure water pipe, a high-pressure cement slurry pipe, and a high-pressure air pipe pass through the hollow pipe.

[0014] As a further improved technical solution, the aforementioned high-pressure jet grouting borehole enlargement equipment for deep overburden layers also includes: A high-pressure water pump, which is installed on the ground and connected to the input end of the high-pressure water pipe; A high-pressure cement slurry pump, wherein the high-pressure cement slurry pump is installed on the ground and connected to the input end of the high-pressure cement slurry pipe; A high-pressure air pump, which is installed on the ground and connected to the input end of the high-pressure air pipe.

[0015] Compared with the prior art, the embodiments of the present invention have the following advantages: In this invention, the lifting assembly can drive the inner cylinder and the cutter head assembly to move up and down. During the lifting process, the cutter head assembly can cut the soil in the stratum. The cut soil is conveyed to the upper part of the inner cylinder through the soil discharge hole to facilitate the cutter head assembly to continue cutting the soil in the stratum. When the cutter head assembly reaches the specified drilling depth, the whole equipment begins to move upward. At this time, the first drive assembly and the high-pressure water pipe are activated to make the outer cylinder rotate around the inner cylinder. During the rotation of the outer cylinder, its water spray hole corresponds to the annular groove, so that the high-pressure water flow delivered from the outlet is ejected from the water spray hole. This causes the water spray hole to perform high-pressure water cutting on the surrounding borehole sidewall while rotating, which breaks up and softens the soil on the surrounding borehole sidewall, so that it can be mixed with cement slurry to form a stable pile foundation. This invention eliminates the need to remove the drilling equipment from the borehole to replace the high-pressure jet grouting equipment after drilling is completed. Drilling and high-pressure water cutting operations can be completed sequentially in a single drilling process, avoiding the time loss caused by frequent equipment changes and repeated drilling in traditional construction methods. This significantly shortens the construction cycle for borehole enlargement in deep overburden layers, and the efficiency improvement is even more obvious in ultra-deep hole construction. Attached Figure Description

[0016] Figure 1 A first structural schematic diagram of a high-pressure jet grouting borehole enlargement device for deep overburden layers provided by the present invention; Figure 2 This invention provides a second structural schematic diagram of a high-pressure jet grouting borehole enlargement device for deep overburden layers; Figure 3 This is a first structural schematic diagram of a portion of the inner cylinder in this invention; Figure 4 This is a schematic diagram of the second structure of a portion of the inner cylinder in this invention; Figure 5 A schematic diagram of the bottom structure of a high-pressure jet grouting borehole enlargement device for deep overburden layers provided by the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the inner cylinder in this invention; Figure 7 This is an exploded view of the outer cylinder in this invention.

[0017] In the diagram: 1. Lifting assembly; 101. Frame; 102. Third motor; 103. Turbine; 104. Worm gear; 2. Inner cylinder; 201. Soil discharge hole; 202. Annular groove; 203. Water inlet; 204. Grout inlet; 205. Mounting groove; 206. Sleeve hole; 3. High-pressure water pipe; 4. Cutter head assembly; 401. Second motor; 402. Rotary drum; 403. Blade; 5. Outer cylinder; 501. Water spray hole; 502. Grout spray hole; 503. Inclined surface; 504. Annular rack; 6. First drive assembly; 601. First motor; 602. Gear; 7. High-pressure cement grout pipe; 8. High-pressure air pipe; 9. High-pressure water pump; 10. High-pressure cement grout pump; 11. High-pressure air pump; 12. Stress monitoring sensor; 13. Partition plate. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In geotechnical engineering construction, when drilling pile foundations in deep overburden strata, a spiral drilling rig is typically used for initial drilling. After the borehole is formed, the spiral drilling rig is removed from the hole and casing is installed. A high-pressure jet grouting system is then installed and lowered into the hole. The high-pressure water jet from the jet grouting system cuts the soil on the inner wall of the borehole, breaking up and loosening the soil around the borehole wall, making it easier to mix with cement grout to form a stable load-bearing pile foundation. Because this method requires changing drilling and jet grouting equipment repeatedly when constructing multiple pile foundation holes, it results in long construction times and low efficiency.

[0020] Furthermore, using a spiral drilling machine has the following drawbacks: when drilling with a spiral drilling machine, the spiral blades will transport the soil to the outside of the discharge hole. However, after the soil is discharged from the borehole, due to the loose nature of the deep overburden layer, the borehole with internal cavities is prone to collapse under the influence of stratum stress; and the larger the borehole diameter, the more prone the borehole is to collapse, making it difficult to use large-diameter spiral drilling machines for diameter enlargement. Therefore, the following embodiments provided by the present invention are intended to solve the above problems.

[0021] Example Please see Figures 1 to 7The high-pressure jet grouting borehole enlargement device for deep overburden layers includes: a lifting assembly 1; an inner cylinder 2, mounted on the lifting assembly 1 for lifting; a through-hole 201 for discharging soil along the lifting direction of the inner cylinder 2; an annular groove 202 on the side circumference of the inner cylinder 2; a water inlet 203 inside the inner cylinder 2, with the outlet of the water inlet 203 located within the annular groove 202; a high-pressure water pipe 3, the output end of which extends into the inner cylinder 2 and is connected to the inlet of the water inlet 203; a cutter head assembly 4, mounted on the inner cylinder 2 away from the lifting assembly 1 and close to the discharging soil 201; an outer cylinder 5, sleeved on the outer circumference of the inner cylinder 2, with a water spray hole 501 on the side corresponding to the annular groove 202; and a first drive assembly 6, mounted on the inner cylinder 2 and connected to the outer cylinder 5, for driving the outer cylinder 5 to rotate and spray water through the water spray hole 501 for high-pressure water cutting.

[0022] like Figures 1 to 4As shown, in this embodiment, the high-pressure jet grouting borehole enlargement equipment for deep overburden layers includes a lifting assembly 1, an inner cylinder 2, a high-pressure water pipe 3, a cutter head assembly 4, and an outer cylinder 5. The lifting assembly 1 is used to drive the inner cylinder 2 to rise and fall, the cutter head assembly 4 is used to cut the soil layer, the high-pressure water pipe 3 is used to transport high-pressure water, and the outer cylinder 5 is used to use jet grouting high-pressure water to cut the inner wall of the borehole to achieve diameter enlargement. Specifically, the inner cylinder 2 has an irregular cylindrical structure. The top of the inner cylinder 2 is mounted on the lifting assembly 1, and the inner cylinder 2 can be driven by the lifting assembly 1 to move up and down along its own axial direction. Simultaneously, along the lifting direction of the inner cylinder 2, a through-hole 201 is provided on the inner cylinder 2, an annular groove 202 is provided on the side circumference of the inner cylinder 2, and a water inlet 203 is provided radially inside the inner cylinder 2, with the outlet of the water inlet 203 located within the annular groove 202. The output end of the high-pressure water pipe 3 extends into the inner cylinder 2 and is connected to the inlet of the water inlet 203. Next, the cutter head assembly 4 is located at the bottom of the inner cylinder 2 and close to the soil discharge hole 201 to facilitate the delivery of the cut soil to the soil discharge hole 201; the outer cylinder 5 is sleeved on the outer periphery of the inner cylinder 2, and the side of the outer cylinder 5 is provided with a water spray hole 501 corresponding to the annular groove 202. The high-pressure water accumulated in the annular groove 202 will be sprayed out through the water spray hole 501. The first drive assembly 6 is located on the inner cylinder 2 and connected to the outer cylinder 5 to drive the outer cylinder 5 to rotate and spray water through the water spray hole 501 for high-pressure water cutting. In this embodiment, the lifting assembly 1 can drive the inner cylinder 2 and the cutter head assembly 4 to move up and down. During the lifting process, the cutter head assembly 4 can cut the soil in the stratum. The cut soil is conveyed to the upper part of the inner cylinder 2 through the soil discharge hole 201 so that the cutter head assembly 4 can continue to cut and drill downwards. When the cutter head assembly 4 drills to a specified depth, the whole equipment begins to move upwards. At this time, the first drive assembly 6 and the high-pressure water pipe 3 are activated, so that the outer cylinder 5 rotates around the inner cylinder 2. During the rotation of the outer cylinder 5, its water spray hole 501 corresponds to the annular groove 202, so that the high-pressure water flow delivered from the outlet is ejected from the water spray hole 501, thereby making the water spray hole 501 perform high-pressure water cutting on the surrounding borehole sidewall while rotating.

[0023] This embodiment eliminates the need to remove the high-pressure jet grouting equipment from the borehole after drilling is completed. Drilling and high-pressure water cutting operations can be completed sequentially in a single drilling process, avoiding the time losses caused by frequent equipment changes and repeated drilling in traditional construction methods. This significantly shortens the construction cycle for borehole enlargement in deep overburden layers, with a particularly noticeable efficiency improvement in ultra-deep hole construction. Furthermore, this embodiment uses the cutterhead assembly 4 to cut and drill the soil. The soil generated during drilling is not discharged outside the borehole but is transported to the top of the inner cylinder 2 through the soil discharge hole 201, making the borehole less prone to collapse. As the equipment moves upward, the high-pressure water jet further enlarges the borehole diameter, creating gaps between the borehole sidewall and the sides of the inner cylinder 2 and outer cylinder 5. At this time, the soil above the inner cylinder 2 will fall through the gaps between the equipment and the borehole sidewall for subsequent mixing with cement grout to form the pile foundation. This invention uses a cutter head assembly 4 for drilling. For deep, high-stress soil, the length of the soil cut by high-pressure water is limited. A larger diameter cutter head assembly 4 can be used to enlarge the borehole diameter. The enlarged borehole is not hollow inside and is therefore not easy to collapse. Therefore, in this embodiment, the cutter head assembly 4 is suitable for enlarging boreholes in thick overburden layers.

[0024] Furthermore, the high-pressure jet grouting borehole enlargement equipment for the deep overburden layer also includes a high-pressure cement grout pipe 7; along the lifting direction of the inner cylinder 2, the inner cylinder 2 has a plurality of annular grooves 202 on its side circumference, and each annular groove 202 is arranged vertically at intervals along the lifting direction of the inner cylinder 2; the inner cylinder 2 also has a grout delivery hole 204, and the outlet of the water delivery hole 203 and the outlet of the grout delivery hole 204 are respectively located in each annular groove 202 and correspond one-to-one; the output end of the high-pressure cement grout pipe 7 extends into the inner cylinder 2 and is connected to the inlet of the grout delivery hole 204; the outer cylinder 5 also has a spray hole 502 on its side, and the water spray hole 501 and the spray hole 502 correspond one-to-one with each annular groove 202. Specifically, this invention, by adding a high-pressure cement grout pipe 7, a grout delivery hole 204, and a spray hole 502, enables the equipment to directly perform high-pressure cement grout injection while completing high-pressure water cutting and diameter expansion, achieving integrated high-pressure water cutting and grouting construction. This eliminates the need to replace grouting equipment, further improving construction efficiency. Multiple vertically spaced annular grooves 202 are arranged along the lifting direction on the side periphery of the inner cylinder 2, enabling layered high-pressure water cutting and layered grouting. This facilitates segmented cutting and grouting reinforcement based on the different geological characteristics of thick overburden layers, improving the grouting effect.

[0025] The water outlet of the water delivery hole 203 and the grout outlet of the grout delivery hole 204 are respectively set in different annular grooves 202, so that the high-pressure water and high-pressure cement grout form independent flow channels and independent outlets, avoiding mutual interference between water flow and grout, and ensuring the cutting effect and grouting quality. The outer cylinder 5 is equipped with water spray holes 501 and grout spray holes 502 corresponding to each annular groove 202. During the rotation of the outer cylinder 5, circumferential uniform water spraying for diameter expansion and circumferential uniform grout spraying for reinforcement can be achieved, making the hole wall cutting regular, the grouting range uniform, and improving the stability of the hole wall. The layered water spraying and layered grout spraying structure allows for cutting a section and then immediately grouting that section, promptly consolidating and reinforcing the loose and broken hole wall, effectively reducing the risk of hole collapse and diameter reduction, and improving the safety of deep hole construction in thick overburden layers.

[0026] Meanwhile, each annular groove 202 can correspond to one or more water jet holes 501 or grout jet holes 502. For example, a certain annular groove 202 may correspond to two or three water jet holes 501, and these water jet holes 501 are at the same height along the axial direction of the inner cylinder 2. Similarly, a certain annular groove 202 may correspond to two or three grout jet holes 502, and these grout jet holes 502 are at the same height along the axial direction of the inner cylinder 2. Both water jet holes 501 and grout jet holes 502 can be flexibly set individually or in multiples, and multiple holes can be at the same axial height. This allows for targeted adjustment of the number of water jet holes 501 or grout jet holes 502 in the same layer to address the geological differences of different layers in a thick overburden. The height of the inner cylinder 2 within the borehole can be adjusted by the lifting component 1, thereby achieving personalized adaptation for layered cutting and grouting, balancing construction efficiency and quality, and meeting the construction needs of complex strata. Simultaneous operation of multiple water jet holes 501 at the same height enhances the high-pressure water jet intensity at that annular height, facilitating rapid cutting of hard interlayers within thick overburden layers and reducing cutting time. Simultaneous operation of multiple grouting holes 502 at the same height accelerates the grouting speed of that layer, shortening the single-layer construction cycle and further improving overall construction efficiency. The flexible configuration of single or multiple water jet holes 501 and grouting holes 502 reduces the difficulty of equipment processing and adaptation. It can be flexibly adjusted according to the actual project's cutting dimensions and grouting requirements without requiring replacement of the overall inner and outer cylinder structure, improving the equipment's versatility and practicality, and reducing construction equipment investment costs.

[0027] Furthermore, the high-pressure jet grouting borehole enlargement equipment for deep overburden layers also includes a high-pressure air pipe 8. One end of the high-pressure air pipe 8 extends into the inner cylinder 2 and has multiple output ends. Each output end of the high-pressure air pipe 8 is connected to the water inlet and the grout inlet respectively. Specifically, in this embodiment, high-pressure gas can be simultaneously introduced into the high-pressure water flow and the high-pressure cement grout, so that the high-pressure water and high-pressure cement grout form a gas-water mixed jet and a gas-grout mixed jet, which enhances the impact force and diffusion ability of the jet, improves the cutting efficiency of high-pressure water and the grouting penetration effect of high-pressure cement grout. The high-pressure air pipe 8 is set up one-to-one with the water inlet and the grout inlet, which can flexibly adjust the amount of high-pressure gas introduced according to the geological characteristics of different layers of the deep overburden layer, adapt to the cutting and grouting needs of different strata, and avoid the imbalance of the gas-water or gas-grout mixing ratio affecting the construction effect. Introducing high-pressure gas into high-pressure water reduces energy loss in the high-pressure water jet, enhances its cutting and stripping ability on loose and fractured strata, and assists in slag removal, allowing the rock and soil material cut by the cutterhead and broken by the water jet to be discharged more quickly through the slag discharge hole 201, improving construction continuity. Introducing high-pressure gas into high-pressure cement grout allows the grout to form a more uniform solidified body after injection, reducing grouting blind zones, enhancing the penetration and filling effect of the cement grout in the pores of the rock and soil, further reinforcing the borehole wall, reducing the risk of borehole collapse and diameter reduction in thick overburden layers, and improving borehole stability.

[0028] In this embodiment, the distance between the grouting hole 502 and the cutterhead is smaller than the distance between the water jet hole 501 and the cutterhead. That is, in vertical drilling, the grouting hole 502 is closer to the bottom of the borehole than the water jet hole 501, enabling a continuous operation logic of cutting first and then grouting immediately. High-pressure water cuts the borehole wall first, and the grouting hole 502 immediately follows to complete grouting reinforcement, preventing the loose borehole wall from collapsing or narrowing before reinforcement, significantly improving the safety of deep hole construction, especially suitable for thick overburden layers with weak cementation and prone to instability. A reasonable vertical distance between the grouting hole 502 and the water jet hole 501 ensures sufficient space for high-pressure water to complete the cutting while allowing timely grouting. During grouting, the cutterhead assembly 4 can continue to rotate to mix the cement slurry evenly, resulting in a stable pile foundation in the borehole.

[0029] like Figure 5As shown, the inlet of the soil discharge hole 201 at the bottom of the inner cylinder 2 is annular, allowing for circumferential reception of soil and rock. This comprehensively collects sand, pebbles, and other soil debris generated by the cutterhead and high-pressure water cutting, preventing accumulation and blockage due to partial missed connections. This ensures continuous soil discharge and is suitable for construction projects involving large quantities of loose soil and rock from deep overburden layers. The outlet of the soil discharge hole 201 at the top of the inner cylinder 2 is provided with several outlets (two or three, etc.). The inner cylinder 2 contains soil diversion channels, with each outlet of the soil discharge hole 201 corresponding to one channel, which connects to the inlet of the soil discharge hole 201. Multiple channels and outlets of the soil discharge hole 201 ensure even distribution of the discharged soil, resulting in more uniform mixing with the injected mud to form a stable pile foundation.

[0030] like Figure 6 As shown, further, the top of the inner cylinder 2 is truncated cone-shaped, and the top of the soil discharge hole 201 is located on the truncated cone-shaped outer wall of the inner cylinder 2. The truncated cone-shaped structure can guide the rock and soil debris discharged from the soil discharge hole 201 to slide smoothly and divert, avoiding the accumulation and blockage of rock and soil debris at the outlet of the soil discharge hole 201. Along the lifting direction of the inner cylinder 2, the distance between the top of the soil discharge hole 201 and the lifting component 1 is smaller than the distance between the water spray hole 501 and the lifting component 1, avoiding the rock and soil debris from interfering with the high-pressure water jet operation of the water spray hole 501 during the soil discharge process, ensuring that the cutting effect is not affected. The outer wall of the outer cylinder 5 is provided with an inclined surface 503, and some of the water spray holes 501 are set on the inclined surface 503 to spray water obliquely. The oblique high-pressure water jet can expand the cutting coverage of the hole wall, especially for targeted cutting of the hard interlayer around the hole wall in the thick covering layer, while improving the cutting uniformity and making the hole wall shape more regular.

[0031] In this embodiment, the high-pressure jet grouting borehole enlargement device for the deep overburden layer also includes a sealing ring. Along the circumference of the inner cylinder 2, the side wall of the inner cylinder 2 is specially provided with a groove for engaging with the sealing ring. The sealing ring is fitted onto the inner cylinder 2, and the sealing ring is respectively provided between each of the annular grooves 202. The inner wall of the outer cylinder 5 abuts against the outer side of the sealing ring. Specifically, by fitting a sealing ring circumferentially onto the inner cylinder 2 between each annular groove 202, and with the outer side of the sealing ring abutting against the inner wall of the outer cylinder 5, sealing and isolation between adjacent annular grooves 202 can be achieved, preventing high-pressure water and high-pressure cement slurry from flowing between different annular grooves 202, ensuring the independence of each layer of water spraying and grouting, and ensuring that the layered cutting and grouting effects are not interfered with. The sealing ring fits tightly against the inner wall of the outer cylinder 5, filling the gap between the inner cylinder 2 and the outer cylinder 5, forming an effective sealing barrier to prevent high-pressure water and high-pressure cement slurry from leaking from the gap between the inner and outer cylinders 5, avoiding the loss of high-pressure medium and resulting in insufficient jet pressure, ensuring the efficiency of high-pressure water cutting and the density of high-pressure cement slurry injection, and adapting to high-pressure operation conditions.

[0032] Furthermore, the first drive assembly 6 includes a first motor 601 and a gear 602. The inner cylinder 2 has a mounting groove 205 on its side wall, and the first motor 601 is disposed in the mounting groove 205. The outer cylinder 5 has an annular rack 504 on its inner wall along the circumference. The gear 602 is connected to the shaft of the first motor 601 and meshes with the annular rack 504 to drive the outer cylinder 5 to rotate around the inner cylinder 2. Specifically, the mounting groove 205 on the side wall of the inner cylinder 2 allows the first motor 601 to be embedded in the mounting groove 205, achieving embedded installation of the first motor 601 without occupying additional external space of the equipment. This maintains the compactness of the overall equipment structure, avoids the motor protruding and interfering with the equipment's drilling, lifting, and in-hole operations, and adapts to the space requirements of deep hole construction with thick overburden layers.

[0033] like Figure 7 As shown, the outer cylinder 5 is formed by splicing two symmetrical parts. The overall structure of the outer cylinder 5 is an irregular cylindrical shape. The two parts are fixedly connected by bolts on the side walls, which can realize the quick assembly and disassembly of the outer cylinder 5. This facilitates the cleaning, inspection or replacement of the water spray hole 501 and the grout spray hole 502 in the later stage. At the same time, it facilitates the assembly and disassembly of the outer cylinder 5 and the inner cylinder 2, reduces the difficulty of equipment maintenance and assembly, and meets the convenience requirements of field construction with thick overburden.

[0034] Furthermore, the cutter head assembly 4 includes a second motor 401, a rotating drum 402, and blades 403. The inner cylinder 2 has a through-hole 206 along its lifting direction. One end of the through-hole 206 is fitted onto the lifting assembly 1 and fixed to each other. The output ends of the high-pressure water pipe 3, the high-pressure cement slurry pipe 7, and the high-pressure air pipe 8 all extend into the through-hole 206. The water inlet and the slurry inlet are connected to the through-hole 206. The second motor 401 is located inside the through-hole 206, and a partition 13 is provided above the second motor 401. The periphery of the partition 13 is connected to the inner wall of the through-hole 206. The rotating drum 402 is located inside the other end of the through-hole 206, with one end connected to the shaft of the first motor 601 and the other end extending out of the through-hole 206. Multiple blades 403 are provided and are evenly spaced and arranged in a ring around the other end of the rotating drum 402. Each blade 403 is close to the soil discharge hole 201. Specifically, the cutter head assembly 4 integrates the high-pressure water pipe 3, high-pressure cement slurry pipe 7, high-pressure air pipe 8 output end, and second motor 401 within a through-hole 206 set in the lifting direction of the inner cylinder 2. This achieves integrated installation of multiple components without requiring additional installation space, further optimizing the overall compactness of the equipment structure and avoiding interference from messy pipeline and motor layouts in the borehole operation. This adapts to the spatial requirements of deep hole construction in thick overburden layers. The partition 13 can isolate and protect the second motor 401, preventing moisture from entering the motor from the sleeve 206 and causing malfunctions. The blade 403, close to the soil discharge hole 201, can directly guide the cut rock and soil debris to the inlet of the soil discharge hole 201, reducing the accumulation of rock and soil debris. Combined with the soil discharge structure, this improves soil discharge efficiency and adapts to the cutting requirements of large amounts of loose rock and soil in thick overburden layers. Meanwhile, in this embodiment, the rotating drum 402 is detachably connected to the shaft of the first motor 601. For example, the rotating drum 402 and the first motor 602 are respectively provided with corresponding pin holes, and the two are detachably fixedly connected by a pin, so that the rotating drum 402 with a larger size blade 403 can be replaced during the construction process to realize the drilling diameter expansion.

[0035] In this embodiment, the lifting assembly 1 includes a frame 101, a third motor 102, a turbine 103, and a worm gear 104. The frame 101 is mounted on the ground; the third motor 102 is mounted on the frame 101; the turbine 103 is mounted on the shaft of the third motor 102; the worm gear 104 meshes with the turbine 103 to lift and lower the worm gear 104 through the drive of the turbine 103; one end of the sleeve hole 206 is fitted onto one end of the worm gear 104 and fixed to each other; the worm gear 104 has a hollow pipe along its length, and the high-pressure water pipe 3, the high-pressure cement slurry pipe 7, and the high-pressure air pipe 8 pass through the hollow pipe. Specifically, the worm gear 104 has a hollow pipe along its length. The high-pressure water pipe 3, high-pressure cement slurry pipe 7, and high-pressure air pipe 8 pass through this hollow pipe, achieving an integrated arrangement of the pipeline and the lifting structure. This eliminates the need for additional pipeline supports, simplifying the overall pipeline layout of the equipment and preventing exposed pipelines from being worn or squeezed by rock and soil debris, which could lead to leaks. It also prevents the pipelines from interfering with the lifting operation of the worm gear 104, ensuring smooth delivery of the high-pressure medium. Furthermore, in this embodiment, the high-pressure water pipe 3, high-pressure cement slurry pipe 7, and high-pressure air pipe 8 can all be existing expandable pipes.

[0036] Furthermore, the high-pressure jet grouting borehole enlargement equipment for deep overburden layers also includes a high-pressure water pump 9, a high-pressure cement slurry pump 10, and a high-pressure air pump 11. The high-pressure water pump 9 is installed on the ground and connected to the input end of the high-pressure water pipe 3, and is used to deliver high-pressure water to the high-pressure water pipe 3. The high-pressure cement slurry pump 10 is installed on the ground and connected to the input end of the high-pressure cement slurry pipe 7, and is used to deliver high-pressure cement slurry to the high-pressure cement slurry pipe 7. The high-pressure air pump 11 is installed on the ground and connected to the input end of the high-pressure air pipe 8, and is used to deliver high-pressure gas to the high-pressure air pipe 8.

[0037] Furthermore, the high-pressure jet grouting borehole enlargement equipment for deep overburden layers also includes stress monitoring sensors 12. Each of the blades 403 is equipped with a stress monitoring sensor 12, and each stress monitoring sensor 12 is connected to the ground control terminal via Bluetooth to provide real-time feedback on soil hardness and ground uniformity, providing accurate data support for adjusting construction parameters and avoiding blind construction.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0043] Of course, the above description of the embodiments of the present invention is quite detailed, but it should not be construed as a limitation on the scope of protection of the present invention. The present invention may have many other implementations. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A high-pressure jet grouting borehole enlargement device for deep overburden layers, characterized in that, include: Lifting components, An inner cylinder is mounted on the lifting assembly for lifting. Along the lifting direction of the inner cylinder, a through-hole for discharging soil is provided on the inner cylinder. An annular groove is provided on the side periphery of the inner cylinder. A water inlet is provided inside the inner cylinder, and the outlet of the water inlet is located in the annular groove. A high-pressure water pipe, the output end of which extends into the inner cylinder and is connected to the inlet of the water delivery hole; The cutter head assembly is located at the end of the inner cylinder away from the lifting assembly and close to the soil discharge hole; An outer cylinder is fitted around the outer periphery of the inner cylinder, and the side of the outer cylinder is provided with a water spray hole corresponding to the annular groove; A first drive assembly is disposed on the inner cylinder and connected to the outer cylinder to drive the outer cylinder to rotate and spray water through the spray hole for high-pressure water cutting.

2. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 1, characterized in that, Also includes: A high-pressure cement grout pipe; along the lifting direction of the inner cylinder, the inner cylinder has multiple annular grooves on its side circumference, and the inner cylinder also has grout delivery holes. The water outlet of the water delivery hole and the grout outlet of the grout delivery hole are respectively set in each of the annular grooves and correspond one-to-one; the output end of the high-pressure cement grout pipe extends into the inner cylinder and is connected to the grout inlet of the grout delivery hole; the outer cylinder also has spray holes on its side, and the water spray holes and the spray holes correspond one-to-one with each of the annular grooves.

3. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 2, characterized in that, Also includes: A high-pressure air pipe, one end of which extends into the inner cylinder and has multiple output ends, each of which is connected to the water inlet and the slurry inlet respectively.

4. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 2, characterized in that, The distance between the spray nozzle and the cutter head is less than the distance between the water spray nozzle and the cutter head.

5. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 4, characterized in that, The end of the inner cylinder connected to the lifting assembly is shaped like a frustum, and the end of the soil discharge hole away from the cutter head is located on the frustum-shaped outer wall of the inner cylinder; along the lifting direction of the inner cylinder, the distance between the end of the soil discharge hole away from the cutter head and the lifting assembly is smaller than the distance between the water spray hole and the lifting assembly.

6. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 2, characterized in that, Also includes: A sealing ring; along the circumference of the inner cylinder, the sealing ring is sleeved on the inner cylinder, and the sealing ring is respectively provided between each of the annular grooves, and the inner wall of the outer cylinder abuts against the outer side of the sealing ring.

7. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 3, characterized in that, The first driving component includes: The first motor is provided in the mounting groove on the side wall of the inner cylinder. The gear has an annular rack on the inner wall of the outer cylinder along the circumference. The gear is connected to the shaft of the first motor and meshes with the annular rack to drive the outer cylinder to rotate around the inner cylinder.

8. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 7, characterized in that, The cutter head assembly includes: The second motor has a through-hole in the inner cylinder along its lifting direction. One end of the through-hole is fitted onto the lifting assembly and fixed to each other. The output ends of the high-pressure water pipe, the high-pressure cement slurry pipe, and the high-pressure air pipe all extend into the through-hole. The water inlet and the slurry inlet are connected to the through-hole. The second motor is installed inside the through-hole. A rotating drum is disposed inside the other end of the sleeve hole, with one end connected to the shaft of the first motor and the other end extending out of the sleeve hole; The blades are provided in multiple pieces and are evenly spaced and arranged in a ring around the other end of the rotating drum, with each blade close to the soil discharge hole.

9. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 8, characterized in that, The lifting assembly includes: A frame, which is mounted on the ground; A third motor, which is mounted on the frame; A turbine, which is mounted on the shaft of the third motor; A worm gear meshes with a turbine to be lifted and lowered by the turbine. One end of the sleeve hole is fitted onto one end of the worm gear and fixed to it. The worm gear has a hollow pipe along its length. A high-pressure water pipe, a high-pressure cement slurry pipe, and a high-pressure air pipe pass through the hollow pipe.

10. The high-pressure jet grouting borehole enlargement equipment for deep overburden layers according to claim 9, characterized in that, Also includes: A high-pressure water pump, which is installed on the ground and connected to the input end of the high-pressure water pipe; A high-pressure cement slurry pump, wherein the high-pressure cement slurry pump is installed on the ground and connected to the input end of the high-pressure cement slurry pipe; A high-pressure air pump, which is installed on the ground and connected to the input end of the high-pressure air pipe.

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