Reinforced earth embankment

Abstract

The application provides a kind of miscellaneous fill mucky soil pipe network drilling hole wall stable control device, including fixed base, hole wall support unit, inflatable structure and clamping assembly.Fixed base is set at the orifice of drilling, with the through hole that is communicated with the orifice.Hole wall support unit is provided with multiple, multiple hole wall support units can form the wall protection string that can be lowered into drilling through the through hole in series.Every hole wall support unit has expansion section.Inflatable structure can inflate hole wall support unit after being lowered into drilling, so that expansion section extends outward and abuts with hole wall.Clamping assembly can clamp the top end of hole wall support unit before inflating hole wall support unit.The miscellaneous fill mucky soil pipe network drilling hole wall stable control device provided by the application can efficiently respond to the effect of soil stress change, improve the supporting effect, effectively reduce the risk of hole collapse, and guarantee the construction progress and safety.

Description

Technical Field

[0001] This invention belongs to the field of borehole wall support technology, specifically relating to a device for controlling the stability of borehole walls in pipeline networks made of mixed fill and silt. Background Technology

[0002] In the construction of pipeline networks in civil engineering, drilling operations in areas with miscellaneous fill and silty soil face severe challenges in controlling borehole stability. Miscellaneous fill has a complex composition and loose structure, containing a large amount of construction waste, domestic waste and other impurities, and the soil bearing capacity is uneven. Silt has the characteristics of high water content, high compressibility and low strength, and poor shear resistance. During the drilling process, the borehole wall is very easy to collapse due to disturbance. Therefore, borehole wall support devices are required.

[0003] In existing technologies, traditional borehole support devices can provide basic support, but they have significant defects in practical applications. For example, their support surfaces are usually smooth structures, and the friction between the contact surface and the soft soil layer is seriously insufficient, making it unable to effectively resist changes in soil stress. When the drilling depth increases or the soil layer is disturbed, the support components are prone to sliding or displacement along the borehole wall, leading to support failure and subsequently causing borehole collapse accidents, which seriously affect construction progress and safety. Summary of the Invention

[0004] This invention provides a borehole wall stability control device for pipeline networks in mixed fill and silt soil, which aims to solve the problem of poor practicality caused by the existing borehole wall support devices used in drilling of pipeline networks in mixed fill and silt soil, which are prone to sliding or displacement along the borehole wall as the drilling depth increases.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a device for controlling the stability of borehole walls in pipeline networks made of mixed fill and silty soil, comprising:

[0006] A fixed base is installed at the opening of the drilled hole and has a through opening that connects to the opening.

[0007] The borehole wall support unit is provided in multiple units, each of which has a through cavity. The multiple borehole wall support units are connected in series to form a wall support string for being lowered into the borehole through the through cavity; the outer wall of each borehole wall support unit has an expansion section.

[0008] An inflatable structure is provided on the fixed base for inflating the hole wall support unit after it is lowered into the borehole, so that the expansion section extends outward and abuts against the hole wall.

[0009] The clamping assembly has two opposing clamping ends; the clamping assembly is used to clamp the top of the bore wall support unit before the bore wall support unit is inflated.

[0010] In one possible implementation, each of the hole wall support units includes:

[0011] The upper annular ring has an open annular cavity facing downwards; the top of the upper annular ring is provided with an air inlet communicating with the upper annular cavity, and the air inlet is provided with a first one-way air intake structure;

[0012] The lower annular ring has an open, upward-facing lower annular cavity.

[0013] The connection structure is provided in multiple ways. Each connection structure is arranged at an annular interval on the top of the upper annular ring. Each connection structure is used to engage and lock with the limiting insertion hole provided at the bottom of the lower annular ring when the two hole wall support units are connected in series.

[0014] A telescopic expansion ring is coaxially arranged with the upper annular ring or the lower annular ring, with its top end connected to the upper annular ring and its bottom end connected to the lower annular ring; the telescopic expansion ring has an expansion cavity that connects the upper annular cavity and the lower annular cavity; the outer wall of the telescopic expansion ring is the expansion section;

[0015] The upper annular cavity, the lower annular cavity, and the expansion cavity combine to form an inflation cavity.

[0016] In one possible implementation, each of the lower annular rings has an auxiliary tube at its bottom end that communicates with the lower annular cavity, and the auxiliary tube has a second one-way air intake structure; the auxiliary tube is used to extend into the inflation port after the two hole wall support units are connected in series, and the two inflation cavities are connected by the second one-way air intake structure and the first one-way air intake structure.

[0017] The air inlet is surrounded by a first sealing gasket, and the auxiliary tube is surrounded by a second sealing gasket.

[0018] In one possible implementation, the telescopic expansion ring includes:

[0019] The bottom end of the outer cylinder is coaxially connected to the lower annular ring.

[0020] The inner cylinder has its top end coaxially connected to the upper annular ring, and its bottom end extends into the outer cylinder; the bottom outer edge of the inner cylinder is provided with an annular piston ring, which is in sealing sliding contact with the inner wall surface of the outer cylinder;

[0021] A rubber sleeve is fitted onto the outer cylinder, and the expansion cavity is formed between the rubber sleeve and the outer cylinder; the top end of the rubber sleeve is connected to the upper annular ring, and the bottom end is connected to the lower annular ring; the rubber sleeve is the expansion section.

[0022] In one possible implementation, the outer wall surface of the rubber sleeve is provided with several protrusions.

[0023] In one possible implementation, the telescopic expansion ring further includes a plurality of support frames, each of which is circumferentially spaced within the expansion cavity; each support frame includes:

[0024] The first fixing rod is fixed on the upper annular ring and is arranged along the tangential direction of the annular ring;

[0025] The second fixing rod is fixed on the lower annular ring and is arranged along the tangent direction of the annular ring; the second fixing rod is provided with two sliding grooves, each of which is arranged along the length direction of the second fixing rod; each sliding groove has a serrated part at the bottom end;

[0026] Two sliders are provided, and the two sliders are slidably disposed in the two slide grooves respectively; each slider is provided with a snap-fit ​​structure that can be unidirectionally limited with the corresponding sawtooth part;

[0027] There are two rotating rods, one end of each of the two rotating rods is hinged to both ends of the first fixed rod, and the other end of each of the two rotating rods is hinged to the two sliders.

[0028] As the outer cylinder slides downward relative to the inner cylinder, the first fixed rod pulls both rotating rods to tilt downward and rotate in opposite directions, and also causes the two sliders to move relative to each other. The sliders are then engaged unidirectionally with the sawtooth part through the snap-fit ​​structure to form a support structure.

[0029] In one possible implementation, each of the connection structures includes:

[0030] A fixed post has one end fixed to the upper annular ring and the other end extending along the axial direction of the upper annular ring; the top end of the fixed post is provided with a sliding cavity, which is arranged radially along the fixed post.

[0031] Two locking blocks are provided, and the two locking blocks are slidably disposed at both ends of the sliding cavity;

[0032] A spring is disposed in the sliding cavity and abuts against the two locking blocks respectively, for continuously bouncing the two locking blocks so that the outward ends of the two locking blocks tend to continuously extend out of the sliding cavity;

[0033] The bottom of the limiting socket is provided with a limiting platform for the card block to engage.

[0034] In one possible implementation, the clamping assembly includes two clamping structures disposed around the through opening, each clamping structure comprising:

[0035] A clamping block is slidably connected to the fixed base in a horizontal direction. One end of the clamping block extends out of the fixed base and extends out of the center of the through-hole, forming the clamping end.

[0036] The first telescopic structure is fixed on the fixed base and connected to the clamping block.

[0037] In one possible implementation, the clamping assembly further includes two placement structures arranged around the through opening, each of the placement structures comprising:

[0038] A slide block is located above the slider and is slidably connected to the fixed base in the vertical direction;

[0039] A clamping rod is slidably connected to the slide block in a horizontal direction. One end of the clamping rod extends out of the fixed base and also extends out of the center of the through-hole of the box, forming an auxiliary clamping part.

[0040] The second telescopic structure is disposed on the slide and connected to the clamping rod;

[0041] The third telescopic structure is disposed on the fixed base and connected to the slide;

[0042] In this process, after the latter hole wall support unit is assembled and installed into the hole wall support units held by each slider, the protective wall string formed is moved downward as a whole through the cooperation of the placement structure and the clamping structure, and is clamped by the clamping structure.

[0043] In one possible implementation, the inflatable structure includes:

[0044] air pump;

[0045] The connecting pipe has one end connected to the air outlet of the air pump, and the other end is used for detachable connection to the uppermost hole wall support unit of the protective wall string.

[0046] In this implementation, a wall support string formed by multiple borehole wall support units connected in series can cover the entire drilling path. Multiple support units, each with a through cavity, are connected in series to form a wall support string, adapting to drilling needs at different depths and providing segmented, comprehensive support for the borehole wall. This effectively addresses complex geological conditions such as mixed fill and silty soil. After inflation, the expansion section fits tightly against the borehole wall, significantly increasing the contact area and enhancing surface friction. This solves the problem of insufficient friction due to smooth support surfaces in traditional devices, effectively resisting soil stress changes. The clamping and positioning of the clamping components before inflation prevents the support units from sliding or shifting, laying the foundation for subsequent stable support. The overall structure, through the coordinated action of positioning, inflation expansion, and comprehensive fit, achieves stable borehole wall, prevents support component slippage, efficiently responds to soil stress changes, improves support effectiveness, effectively reduces the risk of borehole collapse, and thus ensures construction progress and safety. Attached Figure Description

[0047] Figure 1 A schematic diagram of the borehole wall stability control device for mixed fill and silty soil pipeline networks provided in this embodiment of the invention. Figure 1 ;

[0048] Figure 2 A schematic diagram of the borehole wall stability control device for mixed fill and silty soil pipeline networks provided in this embodiment of the invention. Figure 2 (Hidden hole wall support unit);

[0049] Figure 3 A schematic diagram of the borehole wall support unit structure of the borehole wall stability control device for pipeline networks made of mixed fill and silty soil provided in this embodiment of the invention. Figure 1 ;

[0050] Figure 4 A schematic diagram of the first unidirectional air intake structure and the second unidirectional air intake structure cooperating in the borehole wall stability control device for the mixed fill silt soil pipeline network provided in an embodiment of the present invention.

[0051] Figure 5 A schematic diagram of the clamping assembly of the borehole wall stabilization control device for miscellaneous fill and silty soil pipeline network provided in an embodiment of the present invention;

[0052] Figure 6 A schematic diagram of the connection structure of the borehole wall stability control device for miscellaneous fill and silty soil pipeline network provided in an embodiment of the present invention;

[0053] Figure 7 A schematic diagram of the borehole wall support unit of the borehole wall stability control device for mixed fill and silty soil pipeline networks provided in this embodiment of the invention. Figure 2 (Hidden rubber sleeve);

[0054] Figure 8 A schematic diagram of the support frame for the borehole wall stability control device for miscellaneous fill and silty soil pipeline network provided in an embodiment of the present invention;

[0055] Figure 9 This is a partial cross-sectional view of the support frame of the borehole wall stability control device for the mixed fill and silty soil pipeline network provided in an embodiment of the present invention.

[0056] Explanation of reference numerals in the attached figures:

[0057] 10. Fix the base;

[0058] 20. Hole wall support unit; 21. Upper annular ring; 211. Air inlet; 22. Lower annular ring; 23. Connecting structure; 231. Fixing post; 232. Locking block; 233. Spring; 24. Telescopic expansion ring; 241. Outer cylinder; 242. Inner cylinder; 243. Rubber sleeve; 244. Protrusion; 245. Support frame; 2451. First fixing rod; 2452. Second fixing rod; 2453. Slider; 2454, Rotating rod; 2455, Slide groove; 2456, Serrated section; 2457, Limiting rod; 2458, Elastic element; 25, First one-way air intake structure; 251, First separating ring; 252, First sealing ball; 253, First spring; 26, Auxiliary tube; 27, Second one-way air intake structure; 271, Second separating ring; 272, Second sealing ball; 273, Second spring; 274, Needle tube;

[0059] 30. Inflatable structure; 31. Air pump; 32. Connecting pipes;

[0060] 40. Clamping assembly; 41. Clamping structure; 411. Clamping block; 412. First telescopic structure; 42. Placement structure; 421. Slide; 422. Clamping rod; 423. Second telescopic structure; 424. Third telescopic structure. Detailed Implementation

[0061] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0062] Please refer to the following: Figure 1 and Figure 2The present invention describes a borehole wall stabilization control device for pipeline networks constructed from mixed fill and silt. The device includes a fixed base 10, borehole wall support units 20, an inflation structure 30, and a clamping assembly 40. The fixed base 10 is located at the borehole opening and has a through-hole. Multiple borehole wall support units 20 are provided, each with a through-cavity. Multiple support units 20 are connected in series to form a protective wall string that can be lowered into the borehole through the through-hole. Each support unit 20 has an expansion section on its outer wall. The inflation structure 30 is mounted on the fixed base 10 and inflates the support units 20 after they are lowered into the borehole, causing the expansion sections to extend outwards and abut against the borehole wall. The clamping assembly 40 has two opposing clamping ends. The clamping assembly 40 clamps the top of the support units 20 before inflation.

[0063] The working principle is as follows: First, the fixed base 10 is fixed at the borehole opening. Then, according to the drilling depth, multiple borehole wall support units 20 are connected in series at the fixed base 10 to form a protective wall string, which is gradually lowered into the borehole. During the lowering process, the top of the borehole wall support unit 20 can be clamped and fixed at any time using the two opposing clamping ends of the clamping assembly 40 to prevent displacement of the support unit due to uneven borehole walls or soil disturbance, ensuring that the protective wall string is precisely positioned at the center of the borehole. After the protective wall string is lowered to the designated depth, the top of the protective wall string is clamped by the clamping assembly 40. Then, the inflation structure 30 is activated to inflate the borehole wall support unit 20, causing the expansion section of the borehole wall support unit 20 to extend outwards and tightly abut against the borehole wall.

[0064] The borehole wall stabilization control device for pipeline networks in mixed fill and silty soil provided in this embodiment, compared with the prior art, uses a series of borehole wall support units 20 connected in series to form a protective wall string that can cover the entire borehole. Multiple borehole wall support units 20 are provided, each with a through cavity. These units, connected in series, form a protective wall string, adaptable to drilling needs at different depths, achieving segmented and comprehensive support for the borehole wall, thus effectively addressing the complex geological conditions of mixed fill and silty soil. After inflation, the expansion section fits tightly against the borehole wall, significantly increasing the contact area and enhancing the friction of the contact surface. This solves the problem of insufficient friction due to the smooth support surface of traditional devices, effectively resisting changes in soil stress. The clamping component 40, positioned before inflation, prevents the support unit from sliding or shifting before inflation, laying the foundation for subsequent stable support. The overall structure, through the coordinated action of positioning, inflation expansion, and comprehensive fit, achieves the effects of stabilizing the borehole wall, preventing the support component from sliding down, efficiently responding to changes in soil stress, improving support effectiveness, effectively reducing the risk of borehole collapse, and thus ensuring construction progress and safety.

[0065] In some embodiments, the above-mentioned hole wall support unit 20 may adopt the following... Figure 3 and Figure 7 The structure shown. See also Figure 3 and Figure 7 Each hole wall support unit 20 includes an upper annular ring 21, a lower annular ring 22, a connecting structure 23, and a telescopic expansion ring 24. The upper annular ring 21 has an upper annular cavity with its opening facing downwards. The top of the upper annular ring 21 has an air inlet communicating with the upper annular cavity, and the air inlet contains a first one-way air intake structure 25. The lower annular ring 22 has a lower annular cavity with its opening facing upwards. Multiple connecting structures 23 are provided, each annularly spaced at the top of the upper annular ring 21. Each connecting structure 23 can engage and lock with a limiting insertion hole located at the bottom of the lower annular ring 22 when two hole wall support units 20 are connected in series. The telescopic expansion ring 24 is coaxially arranged with the upper annular ring 21 or the lower annular ring 22, with its top end connected to the upper annular ring 21 and its bottom end connected to the lower annular ring 22. The telescopic expansion ring 24 has an expansion cavity communicating with the upper and lower annular cavities. The outer wall of the telescopic expansion ring 24 is an expansion section.

[0066] The upper annular cavity, lower annular cavity, and expansion cavity combine to form an inflation cavity.

[0067] When multiple borehole wall support units 20 are connected in series, they are locked together by the connecting structure 23 on the upper annular ring 21 and the limiting insertion hole at the bottom of the adjacent lower annular ring 22, ensuring the stability of the series-connected wall support structure and preventing relative displacement within the borehole. During inflation, gas enters the upper annular cavity through the inflation port of the upper annular ring 21, and then flows into the lower annular cavity through the expansion cavity, filling the entire inflation cavity with gas. As the gas pressure increases, the telescopic expansion ring 24 expands outward under the thrust of the gas, and the expansion section of its outer wall gradually contacts and tightly abuts against the borehole wall. The first one-way air intake structure 25 effectively prevents the backflow of gas in the inflation cavity, ensuring that the expansion section maintains a tight fit with the borehole wall.

[0068] The annular spacing of the connecting structure 23 ensures the coaxiality and stability of multiple support units connected in series, preventing loosening at the connection points and ensuring uniform stress distribution across the entire support wall string, thus better coping with soil stress changes. The coaxial arrangement of the telescopic expansion ring 24 with the upper and lower annular rings 22 ensures uniformity as the expansion section extends outward, resulting in consistent support force on the borehole wall in all directions and guaranteeing a stable borehole wall. The inflation chamber allows gas to be evenly distributed throughout the support unit, driving the telescopic expansion ring 24 to fully expand, significantly increasing the contact area and fit with the borehole wall, enhancing friction on the contact surface, and effectively preventing the support unit from sliding down the borehole wall. The first unidirectional air intake structure 25 ensures sealing after inflation, maintaining a stable support force. Even when the soil is disturbed or stress changes, it maintains a good support state, with a significantly better support effect than traditional devices, reducing the risk of borehole collapse.

[0069] In some embodiments, the lower annular ring 22 may be adopted as follows: Figure 4 The structure shown. See also Figure 4 Each lower annular ring 22 has an auxiliary pipe 26 at its bottom end that communicates with the lower annular cavity. The auxiliary pipe 26 has a second one-way air intake structure 27. The auxiliary pipe 26 can extend into the inflation port after the two hole wall support units 20 are connected in series, and the two inflation cavities are connected by the contact between the second one-way air intake structure 27 and the first one-way air intake structure 25.

[0070] The air inlet is surrounded by a first sealing gasket, and the auxiliary tube 26 is surrounded by a second sealing gasket.

[0071] When multiple borehole support units 20 are connected in series, the auxiliary tube 26 at the bottom end of the lower annular ring 22 of the subsequent support unit is aligned with the inflation port of the upper annular ring 21 of the preceding support unit and inserted. During insertion, the second one-way air intake structure 27 on the auxiliary tube 26 abuts against the first one-way air intake structure 25 inside the inflation port, aligning their one-way conduction directions and connecting the inflation chambers of the two support units. Simultaneously, the first sealing gasket around the inflation port and the second sealing gasket around the auxiliary tube 26 fit tightly together, sealing the gaps at the connection. During inflation, gas enters from the inflation port at the top of the support wall string, passes sequentially through the first one-way air intake structure 25, the second one-way air intake structure 27, and the auxiliary tube 26 of each adjacent support unit, and flows into the inflation chamber of each support unit, causing the expansion rings 24 of all support units to expand synchronously and abut against the borehole wall.

[0072] The auxiliary tube 26, in conjunction with the inflation port, connects the inflation chambers of multiple support units in series. This allows all support units to expand with a single inflation, ensuring convenient operation and consistent inflation pressure across all units. This guarantees uniform contact between the expanded section and the borehole wall, preventing uneven support force caused by insufficient inflation in some units. The two sealing gaskets further enhance the sealing of the connection points, preventing gas leakage from gaps and preventing impurities such as mud and moisture from entering the inflation chamber, protecting the internal structure from damage and extending the device's service life.

[0073] In this embodiment, the first one-way air intake structure 25 may include two first partition rings 251 spaced apart in the air inlet. The two first partition rings 251 are provided with first blocking balls 252 and a first spring 253233 that bounces the first blocking balls 252. The first spring 253233 can bounce the blocking balls to continuously contact the first partition rings 251 located above or on the outside, so as to block the first partition rings 251.

[0074] The second one-way air intake structure 27 may include two second partition rings 271 spaced apart within the auxiliary pipe 26. Each partition ring 271 contains a second sealing ball 272, and a second spring 273233 is provided to spring the sealing ball 272. The second spring 273233 can spring the sealing ball to continuously contact the second partition ring 271 located below or on the outside, thereby sealing the second partition ring 271. A needle tube 274 is connected to the second sealing ball 272. The needle tube 274 is slidably connected to the lower partition ring along the axial direction of the auxiliary pipe 26, and the end of the needle tube 274 connecting to the second sealing ball 272 has an air hole.

[0075] During the process of the auxiliary tube 26 being inserted into the inflation port, the needle tube 274 will push the first sealing ball 252, thereby opening the first one-way air intake structure 25. At the same time, the second sealing ball 272 will be compressed by the reverse force, thereby opening the second one-way air intake structure 27, so that the two mating protective wall support units are connected.

[0076] When the wall support unit is located at the bottom of the wall string, the openings of each auxiliary pipe 26 can be sealed by the protective caps that are threaded to the auxiliary pipe 26.

[0077] In some embodiments, the aforementioned expansion ring 24 may be adopted as follows: Figure 3 and Figure 7 The structure shown. See also Figure 3 and Figure 7 The telescopic expansion ring 24 includes an outer cylinder 241, an inner cylinder 242, and a rubber sleeve 243. The bottom end of the outer cylinder 241 is coaxially connected to the lower annular ring 22. The top end of the inner cylinder 242 is coaxially connected to the upper annular ring 21, and the bottom end of the inner cylinder 242 extends into the outer cylinder 241. An annular piston ring is provided on the outer edge of the bottom of the inner cylinder 242, and the annular piston ring makes sealing sliding contact with the inner wall surface of the outer cylinder 241. The rubber sleeve 243 is fitted onto the outer cylinder 241, forming an expansion cavity between the rubber sleeve 243 and the outer cylinder 241. The top end of the rubber sleeve 243 is connected to the upper annular ring 21, and the bottom end is connected to the lower annular ring 22. The rubber sleeve 243 is the expansion section.

[0078] After the gas enters the expansion chamber, as the pressure gradually increases, it pushes the outer cylinder 241 to slide downward relative to the inner cylinder 242. Since the top of the inner cylinder 242 is fixed to the upper annular ring 21 and the bottom of the outer cylinder 241 is fixed to the lower annular ring 22, the downward sliding of the outer cylinder 241 causes the lower annular ring 22 to move downward relative to the upper annular ring 21, thereby pulling the rubber sleeve 243 outward to expand. During this process, the annular piston ring at the bottom of the inner cylinder 242 maintains a sealed sliding contact with the inner wall of the outer cylinder 241, preventing the gas in the expansion chamber from leaking out of the gap between the two, ensuring that the gas pressure can continuously drive the rubber sleeve 243 to expand until the rubber sleeve 243 is tightly abutted against the orifice wall, forming a stable support state.

[0079] The coaxial sliding fit between the outer cylinder 241 and the inner cylinder 242 provides precise guidance for the expansion of the rubber sleeve 243, ensuring that the rubber sleeve 243 maintains a uniform annular force during expansion, avoiding local over- or under-expansion, and ensuring balanced support force on all parts of the borehole wall, effectively stabilizing the borehole wall. The sealing design of the annular piston ring ensures the sealing performance of the expansion chamber, reduces gas leakage, and allows the rubber sleeve 243 to maintain a continuous expanded state, keeping it in close contact with the borehole wall, enhancing the friction of the contact surface, and effectively preventing the support unit from sliding down the borehole wall. As the expansion section, the rubber sleeve 243 has good elasticity and toughness, adapting to the irregular shape of the borehole wall in miscellaneous fill and silty soil, closely fitting the borehole wall surface, further increasing the contact area and improving the support effect. Moreover, the elastic characteristics of the rubber sleeve 243 allow it to adapt to slight deformation or stress changes in the soil, better cope with soil stress changes, avoid support failure due to soil disturbance, and significantly reduce the risk of borehole collapse.

[0080] In some embodiments, the rubber sleeve 243 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 The outer wall of the rubber sleeve 243 is provided with several protrusions 244. The protrusions 244 are evenly distributed on the outer wall of the rubber sleeve 243 and form an integral structure with the rubber sleeve 243. The shape and size of the protrusions 244 can be designed according to the actual geological conditions to enhance the interaction with the soil of the borehole wall.

[0081] In some embodiments, the aforementioned expansion ring 24 may be adopted as follows: Figure 7 and Figure 8 The structure shown. See also Figure 7 and Figure 8 The telescopic expansion ring 24 also includes multiple support frames 245, each support frame 245 being arranged annularly at intervals within the expansion cavity. Each support frame 245 includes a first fixed rod 2451, a second fixed rod 2452, a slider 2453, and a rotating rod 2454. The first fixed rod 2451 is fixed to the upper annular ring 21 and is arranged along the tangent direction of the annular ring. The second fixed rod 2452 is fixed to the lower annular ring 22 and is arranged along the tangent direction of the annular ring. The second fixed rod 2452 has two sliding grooves 2455, each sliding groove 2455 being arranged along the length direction of the second fixed rod 2452. Each sliding groove 2455 has a serrated portion 2456 at its bottom end. There are two sliders 2453, each slider 2453 being slidably disposed in one of the two sliding grooves 2455. Each slider 2453 has a snap-fit ​​structure that can unidirectionally limit the movement of the corresponding serrated portion 2456. There are two rotating rods 2454. One end of each rotating rod 2454 is hinged to both ends of the first fixed rod 2451, and the other end of each rotating rod 2454 is hinged to two sliders 2453.

[0082] As the outer cylinder 241 slides downward relative to the inner cylinder 242, the first fixed rod 2451 pulls the two rotating rods 2454 to rotate downward in opposite directions, and drives the two sliders 2453 to move relative to each other. They are then engaged unidirectionally with the sawtooth part 2456 through a snap-fit ​​structure to form the support frame 245 structure.

[0083] When the outer cylinder 241 slides downward relative to the inner cylinder 242 during inflation, the second fixed rod 2452, which is fixed to the lower annular ring 22, moves downward accordingly, pulling the two rotating rods 2454 to rotate downward in opposite directions. During the rotation of the rotating rods 2454, the corresponding sliders 2453 move relative to each other within the grooves 2455 of the second fixed rods 2452. As the sliders 2453 move, their locking structure forms a one-way locking with the serrated part 2456 at the bottom of the groove 2455, preventing the sliders 2453 from sliding in the opposite direction, thus forming a stable support frame 245 structure. Multiple annularly spaced support frames 245 synchronously form the support frame 245 structure, which, together with the expanded rubber sleeve 243, constitutes a double support structure, providing a combination of rigid and elastic support force to the hole wall.

[0084] During inflation, the support frame 245 expands synchronously with the rubber sleeve 243, forming a rigid support frame 245 structure. Through the snap-fit ​​structure and the unidirectional limiting of the serrated part 2456, it is ensured that once the support frame 245 structure is formed, it cannot retract in the opposite direction, continuously providing stable rigid support to the borehole wall and effectively resisting changes in soil stress. Multiple annularly spaced support frames 245 evenly distribute the supporting force across the entire circumference of the borehole wall. Combined with the elastic fit of the rubber sleeve 243, this further enhances the fit and friction with the borehole wall, preventing the support unit from slipping.

[0085] In this embodiment, the snap-fit ​​structure may include a limiting rod 2457 and an elastic element 2458. An open cavity is provided at the bottom end of the slider 2453, and the limiting rod 2457 is rotatably disposed within the open cavity, with its bottom end extending out. During the expansion and elongation of the telescopic expansion ring 24, the limiting rod 2457 can rotate in the opposite direction to the vector direction of the slider 2453's movement, thus passing over the serrated portion 2456. However, if the slider 2453 moves in the opposite direction, the limiting rod 2457 will be stuck on one side wall of the open cavity and cannot rotate, and its bottom end will be unidirectionally locked to the serrated portion 2456. The elastic element 2458 ensures that the limiting rod 2457 can continuously bounce downwards and tilt.

[0086] In some embodiments, the connection structure 23 described above can be as follows: Figure 6 The structure shown. See also Figure 6Each connecting structure 23 includes a fixing post 231, a locking block 232, and a spring 233. One end of the fixing post 231 is fixed to the upper annular ring 21, and the other end extends along the axis of the upper annular ring 21. The top end of the fixing post 231 is provided with a sliding cavity, which is arranged radially along the fixing post 231. Two locking blocks 232 are provided, and the two locking blocks 232 are slidably disposed at both ends of the sliding cavity. The spring 233 is disposed in the sliding cavity and abuts against the two locking blocks 232 respectively, and can continuously bounce the two locking blocks 232, so that the outward-facing ends of the two locking blocks 232 have a tendency to continuously extend out of the sliding cavity.

[0087] The bottom of the limiting socket is provided with a limiting platform for the card block 232 to be engaged.

[0088] When two wall support units 20 are connected in series, the fixing post 231 of the annular ring 21 of the preceding support unit is aligned with the limiting insertion hole of the lower annular ring 22 of the following support unit and inserted. During insertion, the inner wall of the limiting insertion hole presses against the two locking blocks 232, causing the locking blocks 232 to retract into the sliding cavity, and the spring 233 is compressed. When the fixing post 231 is inserted to the specified depth and the locking blocks 232 move to the limiting platform position, the elastic force of the spring 233 is released, pushing the two locking blocks 232 outward from the sliding cavity and locking onto the limiting platform, thus achieving the locking and engagement of the two support units.

[0089] The two locking blocks 232 are symmetrically arranged, ensuring uniform force distribution at the connection point and avoiding the stress concentration problem that may occur with a single locking structure, further enhancing the structural strength after cascading. This connection method allows for rapid assembly to form a retaining wall string adapted to different drilling depths, while ensuring the relative positions of each support unit are fixed, enabling the entire retaining wall string to work synergistically, uniformly transmit support force, and effectively cope with changes in soil stress.

[0090] Each sliding cavity is provided with a limiting part to prevent the two locking blocks 232 from moving outside the sliding cavity, and each locking block 232 has a beveled part on its protruding end.

[0091] In some embodiments, the clamping component 40 may employ, for example... Figure 1 , Figure 2 and Figure 5 The structure shown. See also Figure 1 , Figure 2 and Figure 5 The clamping assembly 40 includes two clamping structures 41 arranged around the through opening. Each clamping structure 41 includes a clamping block 411 and a first telescopic structure 412. The clamping block 411 is slidably connected to the fixed base 10 in the horizontal direction. One end of the clamping block 411 extends out of the fixed base 10 and extends out from the center of the through opening, forming a clamping end. The first telescopic structure 412 is fixed on the fixed base 10 and connected to the clamping block 411.

[0092] When the bore wall support unit 20 is lowered to the through-hole position of the fixed base 10, the first telescopic structure 412 is activated, driving the clamping blocks 411 of the two clamping structures 41 to move horizontally towards the center of the through-hole. The clamping ends of the clamping blocks 411 gradually approach the top outer wall of the bore wall support unit 20 until the two clamping ends clamp the top of the bore wall support unit 20, thereby achieving the positioning and fixation of the support unit. During the inflation process, the clamping assembly 40 maintains the clamping state to prevent the bore wall support unit 20 from falling, while ensuring the stability of the bore wall support unit 20.

[0093] In some embodiments, the clamping component 40 may employ, for example... Figure 1 , Figure 2 and Figure 5 The structure shown. See also Figure 1 , Figure 2 and Figure 5 The clamping assembly 40 also includes two placement structures 42 arranged around the through opening. Each placement structure 42 includes a slide 421, a clamping rod 422, a second telescopic structure 423, and a third telescopic structure 424. The slide 421 is located above the clamping block 411 and is slidably connected to the fixed base 10 in the vertical direction. The clamping rod 422 is slidably connected to the slide 421 in the horizontal direction, with one end of the clamping rod 422 extending out of the fixed base 10 and extending out from the center of the through opening to form an auxiliary clamping part. The second telescopic structure 423 is disposed on the slide 421 and connected to the clamping rod 422. The third telescopic structure 424 is disposed on the fixed base 10 and connected to the slide 421.

[0094] In this process, after the next hole wall support unit 20 is assembled and installed with each clamping block 411, the forming protective wall string moves downward as a whole through the cooperation of the placement structure 42 and the clamping structure 41, and is clamped by the clamping structure 41.

[0095] When assembling the various wall support units, they can be directly connected externally to form a wall string. However, this involves deep drilling, long wall strings, and significant weight, making them inconvenient to handle. In such cases, a method of individual placement is preferable.

[0096] When it is necessary to increase the drilling support depth, and a new protective wall support unit is connected in series on the already clamped and fixed borehole wall support unit 20, the slide 421 of the placement structure 42 is first driven to rise to a suitable height by the third telescopic structure 424, and the new protective wall support unit is connected to the protective wall support unit on the clamping structure 41. Then, the clamping rod 422 is driven to move towards the center of the through-hole by the second telescopic structure 423, and the new support unit is clamped by the auxiliary clamping part. The clamping block 411 of the original clamping structure 41 is released, and the slide 421 is driven to descend by the third telescopic structure 424, driving the entire protective wall string to move downward to the specified depth. Then, the first telescopic structure 412 of the original clamping structure 41 drives the clamping block 411 to clamp the top of the protective wall string again, and so on, until the protective wall string is formed, and then it is inflated by the top protective wall support unit.

[0097] The cooperation between the placement structure 42 and the clamping structure 41 enables the segmented lowering and extension of the protective wall string, precisely controlling its lowering depth to adapt to drilling needs of different depths, while avoiding operational difficulties that may arise from lowering an excessively long protective wall string at once. The auxiliary clamping part of the placement structure 42 stably clamps the new support unit, ensuring precise alignment of the two support units during assembly, guaranteeing the stability of the connecting structure 23, and thus maintaining the overall structural stability of the protective wall string. Throughout the operation, the clamping structure 41 and the placement structure 42 work alternately to maintain the stable fixation of the protective wall string, ensuring that each support unit is in a precise position before inflation and expansion, allowing the expanded section to fit evenly against the borehole wall and improving the support effect.

[0098] In some embodiments, the above-described inflatable structure 30 may employ, for example... Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2 The inflation structure 30 includes an air pump 31 and a connecting pipe 32. One end of the connecting pipe 32 is connected to the air outlet of the air pump 31, and the other end can be detachably connected to the uppermost hole wall support unit 20 of the protective wall string.

[0099] After the retaining wall string is lowered to the designated depth and secured by the clamping assembly 40, one end of the connecting pipe 32 is connected and secured to the inflation port of the uppermost support unit of the retaining wall string. The air pump 31 is then started, and the compressed gas generated by the air pump 31 is delivered to the inflation chamber of the uppermost support unit through the connecting pipe 32. From there, the gas flows sequentially into the inflation chambers of all support units through the connecting structures between adjacent support units (such as the auxiliary pipe 26 or a one-way air inlet structure). As gas is continuously injected, the expansion sections of each support unit expand outward synchronously until they are in close contact with the borehole wall.

[0100] The air pump 31 can provide continuous and stable gas pressure, ensuring that the inflation chambers of each support unit can obtain sufficient and uniform air pressure, so that the expansion section expands synchronously and the force of the fit with the hole wall is consistent, thus ensuring the uniformity of the overall support effect.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A borehole wall stability control device for pipeline networks using mixed fill and silt soil, characterized in that, include: A fixed base is installed at the opening of the drilled hole and has a through opening that connects to the opening. The borehole wall support unit is provided in multiple units, each of which has a through cavity. The multiple borehole wall support units are connected in series to form a wall support string for being lowered into the borehole through the through cavity; the outer wall of each borehole wall support unit has an expansion section. An inflatable structure is provided on the fixed base for inflating the hole wall support unit after it is lowered into the borehole, so that the expansion section extends outward and abuts against the hole wall. The clamping assembly has two opposing clamping ends; the clamping assembly is used to clamp the top of the bore wall support unit before the bore wall support unit is inflated; Each of the aforementioned hole wall support units includes: The upper annular ring has an upper annular cavity with its opening facing downwards; The lower annular ring has an open, upward-facing lower annular cavity. The connection structure is provided in multiple ways. Each connection structure is arranged at an annular interval on the top of the upper annular ring. Each connection structure is used to engage and lock with the limiting insertion hole provided at the bottom of the lower annular ring when the two hole wall support units are connected in series. A telescopic expansion ring is coaxially arranged with the upper annular ring or the lower annular ring, with its top end connected to the upper annular ring and its bottom end connected to the lower annular ring; the telescopic expansion ring has an expansion cavity that connects the upper annular cavity and the lower annular cavity; the outer wall of the telescopic expansion ring is the expansion section; The telescopic expansion ring includes: The bottom end of the outer cylinder is coaxially connected to the lower annular ring. The inner cylinder has its top end coaxially connected to the upper annular ring, and its bottom end extends into the outer cylinder; the bottom outer edge of the inner cylinder is provided with an annular piston ring, which is in sealing sliding contact with the inner wall surface of the outer cylinder; A rubber sleeve is fitted onto the outer cylinder, forming the expansion cavity between the rubber sleeve and the outer cylinder; the top end of the rubber sleeve is connected to the upper annular ring, and the bottom end is connected to the lower annular ring; the rubber sleeve is the expansion section. The telescopic expansion ring also includes multiple support frames, each of which is circumferentially spaced within the expansion cavity. Each support frame includes: The first fixing rod is fixed on the upper annular ring and is arranged along the tangential direction of the annular ring; The second fixing rod is fixed on the lower annular ring and is arranged along the tangent direction of the annular ring; the second fixing rod is provided with two sliding grooves, each of which is arranged along the length direction of the second fixing rod; each sliding groove has a serrated part at the bottom end; Two sliders are provided, and the two sliders are slidably disposed in the two slide grooves respectively; each slider is provided with a snap-fit ​​structure that can be unidirectionally limited with the corresponding sawtooth part; There are two rotating rods, one end of each of the two rotating rods is hinged to both ends of the first fixed rod, and the other end of each of the two rotating rods is hinged to the two sliders. As the outer cylinder slides downward relative to the inner cylinder, the first fixed rod pulls both rotating rods to tilt downward and rotate in opposite directions, and also causes the two sliders to move relative to each other. The sliders are then engaged unidirectionally with the sawtooth part through the snap-fit ​​structure to form a support structure.

2. The borehole wall stability control device for pipeline networks made of miscellaneous fill and silty soil as described in claim 1, characterized in that, The top of the upper annular ring is provided with an air inlet that communicates with the upper annular cavity, and the air inlet is provided with a first one-way air intake structure. The upper annular cavity, the lower annular cavity, and the expansion cavity combine to form an inflation cavity.

3. The borehole wall stability control device for pipeline networks made of miscellaneous fill and silty soil as described in claim 2, characterized in that, Each of the lower annular rings has an auxiliary tube at its bottom end that communicates with the lower annular cavity. The auxiliary tube has a second one-way air intake structure. The auxiliary tube is used to extend into the inflation port after the two hole wall support units are connected in series. The two inflation cavities are connected by the second one-way air intake structure and the first one-way air intake structure. The air inlet is surrounded by a first sealing gasket, and the auxiliary tube is surrounded by a second sealing gasket.

4. The borehole wall stability control device for pipeline networks made of mixed fill and silty soil as described in claim 1, characterized in that, The outer wall surface of the rubber sleeve is evenly distributed with several protrusions.

5. The borehole wall stability control device for pipeline networks made of mixed fill and silty soil as described in claim 2, characterized in that, Each of the aforementioned connection structures includes: A fixed post has one end fixed to the upper annular ring and the other end extending along the axial direction of the upper annular ring; the top end of the fixed post is provided with a sliding cavity, which is arranged radially along the fixed post. Two locking blocks are provided, and the two locking blocks are slidably disposed at both ends of the sliding cavity; A spring is disposed in the sliding cavity and abuts against the two locking blocks respectively, for continuously bouncing the two locking blocks so that the outward ends of the two locking blocks tend to continuously extend out of the sliding cavity; The bottom of the limiting socket is provided with a limiting platform for the card block to engage.

6. The borehole wall stability control device for pipeline networks made of mixed fill and silty soil as described in claim 1, characterized in that, The clamping assembly includes two clamping structures arranged around the through opening, each clamping structure comprising: A clamping block is slidably connected to the fixed base in a horizontal direction. One end of the clamping block extends out of the fixed base and extends out of the center of the through-hole, forming the clamping end. The first telescopic structure is fixed on the fixed base and connected to the clamping block.

7. The borehole wall stability control device for pipeline networks made of miscellaneous fill and silty soil as described in claim 6, characterized in that, The clamping assembly further includes two placement structures arranged around the through opening, each placement structure comprising: A slide block is located above the slider and is slidably connected to the fixed base in the vertical direction; A clamping rod is slidably connected to the slide block in a horizontal direction. One end of the clamping rod extends out of the fixed base and also extends out of the center of the through-hole of the box, forming an auxiliary clamping part. The second telescopic structure is disposed on the slide and connected to the clamping rod; The third telescopic structure is disposed on the fixed base and connected to the slide; In this process, after the latter hole wall support unit is assembled and installed with each of the hole wall support units held by the slide blocks, the hole wall stabilization control device of the formed mixed fill silt soil pipeline network moves downward as a whole through the cooperation of the placement structure and the clamping structure, and is clamped by the clamping structure.

8. The borehole wall stability control device for pipeline networks made of miscellaneous fill and silty soil as described in claim 1, characterized in that, The inflatable structure includes: air pump; The connecting pipe has one end connected to the air outlet of the air pump, and the other end is used for detachable connection to the uppermost hole wall support unit of the protective wall string.

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