Long-distance rock stratum pipe jacking anti-blocking main mucking method

Abstract

The application provides a long-distance rock stratum pipe jacking anti-blocking main body mucking method, which comprises the following steps: controlling the lowering of the top cover until a gap is formed between the top cover and the lower side of the pipe jacking main body to allow the mixture of rock muck and mud to pass; providing an extraction force to the mixture of rock muck and mud by an extraction device to make the mixture flow from the feeding port to the discharging port; and cleaning the mixture of rock muck and mud discharged from the discharging port. The long-distance rock stratum pipe jacking anti-blocking main body mucking method provided by the application pre-provides an extraction port on the pipe jacking main body, installs a mucking cylinder and an extraction device in the pipe jacking main body corresponding to the extraction port, drives the top cover to move by the extraction device after the pipe jacking main body stops advancing, and only needs to use the extraction device to move the mixed slurry accumulated on the outer wall of the pipe jacking main body to the inside of the pipe jacking main body for cleaning, so that the cleaning is facilitated, the mucking difficulty is reduced, and the mucking efficiency is high.

Description

Technical Field

[0001] This invention belongs to the field of construction technology of pipe jacking tunnel engineering, specifically relating to a method for preventing pipe jacking and removing slag in long-distance rock strata. Background Technology

[0002] With the trend of industrialized construction, the prefabrication and low-impact construction of tunnels in municipal, transportation, water conservancy, and utility tunnel projects have become requirements for urban development. For some small-diameter tunnels, such as those for water conservancy and pipelines, the pipe jacking method is currently the main construction method.

[0003] During the pipe jacking method, friction-reducing slurry is injected between the rock strata and the pipe body to reduce friction between them. When the pipe jacking construction crosses mountain ranges, the excavation distance is long and the geological conditions are complex. As the pipe body operates within the rock strata, due to displacement deformation or rockfall in the surrounding rock, a large amount of rock debris falls onto the outer wall of the pipe section and mixes with the friction-reducing slurry, forming a mixture of rock debris and slurry. This mixture is difficult to remove as the pipe body advances. Consequently, the mixture of rock debris and slurry gradually accumulates on the outer wall of the pipe section as the pipe body advances, ultimately increasing the frictional resistance of the pipe body, causing a sudden increase in jacking force, and even pipe jamming, thus affecting the smooth progress of long-distance tunneling. Summary of the Invention

[0004] This invention provides a method for preventing long-distance rock jacking pipe from getting stuck and for removing slag, aiming to solve the problem in the prior art of it being difficult to remove the mixture of rock slag and mud accumulated on the outer wall of the jacking pipe body, which causes the mixture to continuously increase in size, making it difficult to advance the jacking pipe body, and even causing the pipe to get stuck.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for preventing jamming during long-distance rock jacking pipe jacking and muck removal is provided, based on a jacking pipe assembly. The jacking pipe assembly includes a jacking pipe body, a muck removal cylinder, a top cover, and an extraction device. An extraction port is formed on the lower side of the jacking pipe body, and the top cover is liftably positioned over the extraction port. The muck removal cylinder is placed inside the jacking pipe body and has an inlet that connects to the extraction port and an outlet that communicates with the inner cavity of the jacking pipe body. The extraction device is located within the muck removal cylinder.

[0007] The long-distance rock stratum jacking pipe anti-jamming main body muck removal method includes the following steps:

[0008] Control the descent of the top cover until a gap is formed between the top cover and the lower side of the jacking pipe body, allowing a mixture of rock debris and mud to pass through;

[0009] The extraction device provides an extraction force to the mixture of rock debris and slurry, so that the mixture of rock debris and slurry flows from the feeding port to the discharging port.

[0010] The mixture of rock debris and slurry discharged from the discharging port is cleaned.

[0011] In a possible implementation, the middle axis of the discharging cylinder is parallel to the radial direction of the main body of the pipe, and the axis end of the discharging cylinder adjacent to the extraction port is defined as a first axis end, and the other axis end is defined as a second axis end. The feeding port is arranged at the first axis end.

[0012] In a possible implementation, the top wall of the discharging cylinder is provided with a threaded hole, and the extraction device includes a rotating shaft and a propeller blade. The rotating shaft is divided into a first segment, a second segment and a third segment from top to bottom. The second segment is threadedly connected to the top wall of the discharging cylinder, and the outer diameter of the second segment is greater than that of the first segment. The propeller blade is connected to the third segment.

[0013] Controlling the top cover to descend specifically includes:

[0014] Rotating the second segment to move the second segment towards the first axis end, and the third segment drives the top cover to move away from the second axis end;

[0015] The extraction device provides an extraction force to the mixture of rock debris and slurry, so that the mixture of rock debris and slurry flows from the feeding port to the discharging port, specifically including:

[0016] The first segment is threadedly connected to the threaded hole, so that the top cover rotates along the axis of the third segment to make the mixture of rock debris and slurry enter the discharging cylinder along the propeller blade with the rotation of the propeller blade.

[0017] In a possible implementation, the extraction device further includes a handle arranged at the top of the first segment, and the handle is used to drive the first segment to rotate.

[0018] In a possible implementation, the first axis end extends outward to form an extension plate, and the extension plate has the same curvature as the inner wall of the main body of the pipe and is sealingly attached.

[0019] In a possible implementation, a sealing plate is arranged between the extension plate and the inner wall of the main body of the pipe.

[0020] In a possible implementation, a guide pipe is further arranged on the side of the top wall of the discharging cylinder facing the third segment, the guide pipe is coaxially arranged with the threaded hole, and the guide pipe is provided with threads matched with the threaded hole.

[0021] In a possible implementation, the outer periphery of the muck discharge cylinder is provided with two guide rails corresponding to the discharge port, and the two guide rails are both slidingly connected to the sealing baffle, so that the sealing baffle can be slidably covered on the discharge port in the circumferential direction of the muck discharge cylinder.

[0022] In a possible implementation, the side of the top cover is inwardly inclined to form a first inclined surface.

[0023] The extraction port is provided with a second inclined surface corresponding to the first inclined surface at one end away from the top pipe body axis.

[0024] In a possible implementation, the extraction port is arranged at the bottom of the top pipe body, and 2-3 top pipe bodies define one advancing group, and the extraction ports on different top pipe bodies in each advancing group are distributed in a staggered manner in the circumferential direction of the advancing group.

[0025] Compared with the prior art, the long-distance rock stratum pipe jacking anti-blocking main muck discharge method provided by the application has the advantages that an extraction port is arranged in advance on the top pipe body, a muck discharge cylinder and an extraction device are arranged in the top pipe body corresponding to the extraction port, after the top pipe body stops advancing, the top cover is driven to move by the extraction device, the mixed slurry mixed with rock muck blocks flows to the muck discharge cylinder through the gap between the top cover and the extraction port, and then is discharged to the inside of the top pipe body through the discharge port. The whole muck discharge process is simple, and only the extraction device is needed to move the mixed slurry accumulated on the outer wall of the top pipe body to the inside of the top pipe body for cleaning, so that the cleaning is facilitated, the muck discharge difficulty is reduced, and the muck discharge efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0027] Figure 1 The assembly diagram of the top pipe body and the muck discharge cylinder provided by the first embodiment of the application is shown in the figure.

[0028] Figure 2 The assembly diagram of the top pipe body and the muck discharge cylinder provided by the first embodiment of the application is shown in the figure. Figure 1 The enlarged view of the part is shown in the figure.

[0029] Figure 3 The structure diagram of the muck discharge cylinder used in the first embodiment of the application is shown in the figure.

[0030] Figure 4 The structure diagram of the extraction device used in the first embodiment of the application is shown in the figure.

[0031] Figure 5This is a schematic diagram of the assembly of the third section and the propeller blade used in Embodiment 1 of the present invention;

[0032] Figure 6 This is a schematic diagram of the extraction port structure used in Embodiment 1 of the present invention;

[0033] Figure 7 This is a schematic diagram of the slag discharge cylinder used in Embodiment 2 of the present invention;

[0034] Figure 8 This is a schematic diagram of the propeller blade used in Embodiment 3 of the present invention;

[0035] Figure 9 This is a schematic diagram of the top cover structure used in Embodiment 4 of the present invention;

[0036] Figure 10 This is a cross-sectional view of the A-type jacking pipe body in the propulsion group used in Embodiment 5 of the present invention;

[0037] Figure 11 This is a cross-sectional view of the B-type jacking pipe body in the propulsion group used in Embodiment 5 of the present invention;

[0038] Figure 12 This is a cross-sectional view of the C-shaped jacking pipe body in the propulsion group used in Embodiment 5 of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Pipe jacking body; 11. Extraction port; 111. Second inclined plane;

[0041] 2. Slag discharge cylinder; 201. First shaft end; 202. Second shaft end; 21. Feed inlet; 22. Discharge outlet; 23. Screw hole; 24. Extension plate; 25. Guide tube; 26. Guide rail; 27. Receiving support plate; 28. Sealing cover;

[0042] 3. Top cover; 31. First inclined plane;

[0043] 4. Extraction device; 41. Rotating shaft; 411. First section; 412. Second section; 413. Third section; 42. Propeller blade; 43. Handle;

[0044] 5. Sealing baffle;

[0045] 6. Fastening components. Detailed Implementation

[0046] 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.

[0047] It should be noted that the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", and "tail" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present 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 the invention.

[0048] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] 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 one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0050] Please refer to the following: Figures 1 to 12 The present invention will now describe the long-distance rock stratum pipe jacking anti-jamming main body muck removal method provided by the present invention. The long-distance rock stratum pipe jacking anti-jamming main body muck removal method is based on a pipe jacking assembly, which includes a pipe body 1, a muck removal cylinder 2, a top cover 3, and an extraction device 4. An extraction port 11 is formed on the lower side of the pipe body 1, and the top cover 3 is raised and lowered and placed over the extraction port 11. The muck removal cylinder 2 is placed inside the pipe body 1 and has an inlet 21 that connects to the extraction port 11 and an outlet 22 that communicates with the inner cavity of the pipe. The extraction device 4 is equipped with… The long-distance rock jacking pipe muck discharge method includes the following steps: controlling the top cover 3 to descend until a gap is formed between the top cover 3 and the lower side of the jacking pipe body 1 to allow the mixture of rock muck and mud to pass through; using the extraction device 4 to provide extraction force to the mixture of rock muck and mud, so that the mixture of rock muck and mud flows from the feed port 21 to the discharge port 22; cleaning the mixture of rock muck and mud discharged from the discharge port 22.

[0051] It should be noted that after the rock debris is cleared, the top cover 3 is raised until it re-seales with the extraction port 11. The main pipe jacking unit 1 can then continue to advance and carry out debris removal work in the new rock strata.

[0052] It should be noted that during the process of the main pipe jacking 1 advancing into the rock strata, in order to reduce the resistance between the rock strata and the main pipe jacking 1, there is a friction-reducing mud between the outer wall of the main pipe jacking 1 and the rock strata. The friction-reducing mud is used to reduce friction. However, due to the rock debris falling off and mixing into the mud to form a mixture, the mixture continues to grow larger, which leads to a decrease in the friction-reducing effect of the mud, and ultimately affects the advancement of the main pipe jacking 1.

[0053] It should be noted that the friction-reducing mud must have a certain pressure to reduce the friction between the main body of the jacking pipe 1 and the rock strata. As the top cover moves outward, the mud mixture containing rock debris will enter the main body of the jacking pipe 1 through the gap between the top cover 3 and the extraction port 11. To ensure that no more mud enters the main body of the jacking pipe 1 after the rock debris is removed, the discharge port 22 is designed to be sealable to ensure that no more mud enters the main body of the jacking pipe 1. The mud outside the main body of the jacking pipe 1 is kept at a certain pressure, thereby ensuring the normal advancement of the main body of the jacking pipe 1.

[0054] The long-distance rock jacking pipe anti-jamming main body muck removal method provided in this embodiment, compared with the prior art, has an extraction port 11 pre-set on the jacking pipe body 1, and a muck removal cylinder 2 and an extraction device 4 installed inside the jacking pipe body 1 corresponding to the extraction port 11. After the jacking pipe body 1 stops advancing, the top cover 3 is moved by the extraction device 4, and the mixed slurry containing rock muck will flow along the gap between the top cover 3 and the extraction port 11 to the muck removal cylinder, and then be discharged into the jacking pipe body 1 through the discharge port 22. The whole muck removal process is simple. It only requires the extraction device 4 to move the mixed slurry accumulated on the outer wall of the jacking pipe body 1 into the jacking pipe body 1 for removal, which is convenient for cleaning, reduces the difficulty of muck removal, and has high muck removal efficiency.

[0055] In some embodiments, see Figure 1 and Figure 2 The central axis of the muck discharge cylinder 2 is parallel to the radial direction of the jacking pipe body 1. One end of the muck discharge cylinder 2 near the extraction port 11 is defined as the first end 201, and the other end is defined as the second end 202. The feed inlet 21 is located at the first end 201. The muck discharge cylinder 2 is connected to the extraction port 11 through the feed inlet 21. The extraction port 11 is located at the first end 201. The extraction path of the mixture of rock debris and mud is straight, resulting in low extraction resistance and high extraction efficiency.

[0056] In some embodiments, see Figure 2 and Figure 4The top wall of the slag discharge cylinder 2 has a screw hole 23. The extraction device 4 includes a rotating shaft 41 and a propeller blade 42. The rotating shaft 41 is divided into a first section 411, a second section 412, and a third section 413 from top to bottom. The second section 412 is threaded into the top wall of the slag discharge cylinder 2, and the outer diameter of the second section 412 is larger than the outer diameter of the first section 411. The propeller blade 42 is connected to the third section 413. Controlling the descent of the top cover 3 specifically includes rotating the second section 412 so that the second section 412 faces the first shaft. As end 201 moves, the third section 413 drives the top cover 3 to move away from the second shaft end 202; the extraction device 4 provides extraction force to the mixture of rock debris and mud, so that the mixture of rock debris and mud flows from the feed port 21 to the discharge port 22. Specifically, the first section 411 rotates with the screw hole 23, so that the top cover 3 rotates along the axis of the third section 413, so that the mixture of rock debris and mud enters the discharge cylinder 2 along the propeller blade 42 as the propeller blade 42 rotates.

[0057] During the rotation of the shaft 41, the second section 412 is threadedly engaged with the screw hole 23, which is located on the top wall of the muck discharge cylinder 2. The second section 412 moves axially along the axis of the muck discharge cylinder 2. The third section 413 is connected to the top cover 3. The threaded engagement of the second section 412 with the screw hole 23 enables the top cover 3 to move away from the extraction port 11. Because the second section 412 is threadedly engaged with the screw hole 23, the second section 412 can only move along its own long axis. When the top cover 3 is pressed against the excavated rock surface, the second section 412 cannot be rotated, which means that the propeller blade 42 cannot be rotated and the mixture of rock debris and mud cannot be brought into the muck discharge cylinder 2. Therefore, the outer diameter of the second section 412 is larger than that of the first section 411. When the top cover 3 is pressed against the excavated rock surface, the first section 411 is in the screw hole 23. The first section 411 can rotate along its own axis, thereby realizing the rotation of the second section 412. The top cover 3 can rotate in the same position. The mixture of rock debris and mud can enter the interior of the muck discharge cylinder 41 along the thread direction of the propeller blade 42 as the third section 413 rotates, realizing the transfer of the mixture of rock debris and mud.

[0058] As another embodiment of the cooperation between propeller blade 42 and shaft 41, shaft 41 is divided into a first section 411 and a second section 412. Propeller blade 42 adopts a belt-type screw rod. Propeller blade 42 is connected to the second section 412. When propeller blade 42 adopts a belt-type screw rod, the screw blade is large, which is suitable for the discharge of rock debris with a large block diameter.

[0059] In practice, the spiral diameter of the propeller blade 42 is matched with the inner diameter of the extraction port 11 to ensure that when the propeller blade 42 rotates, its rotation axis always overlaps with the axis of the extraction port 11, so as to avoid the propeller blade 42 from shifting and affecting the subsequent reset of the top cover 3.

[0060] As another implementation method for opening screw hole 23, see [reference].Figure 7 The slag discharge cylinder 2 is a cylindrical structure with openings at the top and bottom. The bottom opening of the slag discharge cylinder 2 forms a feed inlet 21, and the side wall of the slag discharge cylinder 2 has a discharge outlet 22. The opening at the top of the slag discharge cylinder 2 is covered with a sealing cover 28. A screw hole 23 is opened in the center of the sealing cover 28. The screw hole 23 is opened on the sealing cover 28 to facilitate the replacement of the extraction device 4. The sealing cover 28 with different screw holes 23 can be replaced for different sizes of rotating shaft 41, which increases the interchangeability and adaptability of the slag discharge cylinder 2.

[0061] In some embodiments, see Figure 1 and Figure 2 The extraction device 4 also includes a handle 43 located at the top of the first section 411, which drives the first section 411 to rotate. When the operator rotates the first section 411 via the handle 44, the second section 412 rotates with the first section 411. The second section 412 is threaded into the screw hole 23, enabling the axial movement of the second section 412. The second section 412 drives the third section 413 to move axially, thereby causing the top cover 3 to move outward. The mixture of mud and rock debris enters the extraction port 11 through the gap between the top cover 3 and the extraction port 11, and rises along the propeller blade 42 with the rotation of the third section 413, thus sending the mixture of mud and rock debris into the muck discharge cylinder 41. The muck discharge cylinder 41 is located inside the jacking pipe body 1, which allows the rock debris that is inconvenient to remove in the prior art to be moved to a more convenient operating position, thereby realizing the removal of rock debris. The overall operation is less difficult.

[0062] In some embodiments, see Figures 2 to 3 The first shaft end 201 extends outward to form an extension plate 24. The extension plate 24 has the same curvature as the inner wall of the jacking pipe and fits in a sealed manner. The extension plate 24 provides the connection position required for the sealing and fit between the slag discharge cylinder 41 and the jacking pipe body 1. The extension plate 24 has the same curvature as the inner wall of the jacking pipe body 1, which facilitates the connection between the slag discharge cylinder 2 and the jacking pipe body 1.

[0063] In practice, the extension plate 24 and the inner wall of the jacking pipe body 1 are locked together by the fastening assembly 6. The fastening assembly 6 includes bolts and a pre-set mounting hole on the inner wall of the jacking pipe body 1. The bolts and the mounting hole are threaded together to connect the extension plate 24 and the inner wall of the jacking pipe body 1.

[0064] In some embodiments, a sealing plate is provided between the extension plate 24 and the inner wall of the jacking pipe body 1. The sealing plate can further improve the sealing effect between the extension plate 411 and the inner wall of the jacking pipe body 1, ensuring that the mud will not flow out from between the extension plate 411 and the inner wall of the jacking pipe body 1, thereby ensuring the mud pressure outside the jacking pipe body 1.

[0065] Optionally, the sealing plate can be a rubber waterstop. Rubber waterstops have a certain strength, are unaffected by ambient temperature, have good corrosion resistance, and strong compressive strength, thus meeting the requirements for a sealing plate. Of course, the sealing plate can also be other sealing plates with sealing effects, such as sealing waterstop steel plates, as long as they have a certain sealing performance and good compressive strength. These will not be listed here.

[0066] In some embodiments, see Figure 2 A guide tube 25 is also fixedly installed on the top wall of the slag discharge cylinder 2 facing the third section 413. The guide tube 25 and the screw hole 23 are coaxially arranged, and the guide tube 25 has a thread that matches the screw hole 23. The guide tube 25 can restrict the movement direction of the second section 412, ensuring that the second section 412 always moves along its own axis. Since the second section 412 and the third section 413 are connected, the third section 413 always moves along its own axis, ensuring that the top cover 3 can be smoothly pushed to the excavated rock surface, and can re-seal and cooperate with the extraction port 11 when reset.

[0067] In some embodiments, see Figure 3 Two guide rails 26 are provided on the outer periphery of the muck discharge cylinder 2 corresponding to the discharge port 22. Both guide rails 26 are slidably connected to the sealing baffle 5, so that the sealing baffle 5 can slide and cover the discharge port 22 in the circumferential direction of the muck discharge cylinder 2. The discharge port 22 is sealed by the sealing baffle 5. When the mixture of rock debris and mud enters the muck discharge cylinder 1, the sliding sealing baffle 5 opens the discharge port 22, and the mixture of rock debris and mud flows from the discharge port 22 into the jacking pipe body 1, which facilitates the cleaning of the mixture by the workers.

[0068] It should be noted that, in order to prevent the friction-reducing mud from entering the jacking pipe body 1 from the discharge port 22 and affecting the pressure of the friction-reducing mud between the jacking pipe body 1 and the rock strata, a sealing baffle 5 is installed at the discharge port 22 to block the discharge port 22, ensuring that only the mixture of rock debris and mud and a small amount of friction-reducing mud flow out from the discharge port 22.

[0069] In practice, the sealing baffle 5 is an arc-shaped baffle, and the outer wall curvature of the sealing baffle 5 and the slag discharge cylinder 2 are the same, ensuring that the sealing baffle 5 accurately seals the discharge port 22.

[0070] In some embodiments, see Figure 3 A receiving plate 27 is provided on the side wall of the slag discharge cylinder 2 in the area corresponding to the discharge port 22, and the receiving plate 27 is located below the discharge port 22. The receiving plate 27 is used to receive the mixture of rock slag and mud flowing out from the discharge port 22. In specific implementation, a receiving container is placed at the end of the receiving plate 27. The receiving plate 27 can automatically receive the mixture and send it into the receiving container. The mixture of rock slag and mud will not flow onto the inner wall surface of the jacking pipe body 1, affecting the cleanliness of the inside of the jacking pipe body 1.

[0071] During the slag removal process, a slag shovel can be used to help clean the mixture.

[0072] The extraction device 4 provided in this embodiment is used in the following general process:

[0073] (1) Rotate the handle 43 to drive the shaft 41 to rotate. The second section 412 and the screw hole 23 are threaded together, so that the third section 413 moves toward the extraction port 11, thereby driving the top cover 3 to move toward the excavated rock surface.

[0074] (2) Continue to turn the handle 43 until the top cover 3 is pressed tightly against the excavated rock surface;

[0075] (3) Continue to rotate the handle 43. At this time, the first section 411 is located in the screw hole 23. The first section 411 rotates at the same height, driving the propeller blade 42 to rotate. The mixture of rock debris and mud enters the inside of the slag discharge cylinder 2 with the rotation of the propeller blade 42.

[0076] (4) Slide the sealing baffle 5 to open the discharge port 22, and continuously rotate the handle 43 to discharge the mixture of rock debris and mud from the discharge port 22 into the interior of the jacking pipe body 1.

[0077] (5) After the rock debris at the location of the main pipe jacking body 1 is cleared, push the main pipe jacking body 1 to the preset position, and continue to rotate the handle 43 to clear the mixture of rock debris and mud.

[0078] (6) Rotate the handle 44 in the opposite direction to reset the second section 412, thereby driving the top cover 3 to rotate in the opposite direction. The top cover 3 moves toward the extraction port 11. Continue to rotate the handle 43 until the top cover 3 and the extraction port 11 are sealed together.

[0079] In some embodiments, see Figure 6 and Figure 9 The top cover 3 is inclined inward to form a first inclined surface 31; the end of the extraction port 11 away from the axis of the jacking pipe body 1 forms a second inclined surface 111 corresponding to the first inclined surface 31. The setting of the first inclined surface 31 and the second inclined surface 111 allows the top cover 3 and the extraction port 111 to fit together, improving the sealing effect. The top cover 3 will not enter the interior of the extraction port 111, ensuring that the mud outside the jacking pipe body 1 will not enter the interior of the jacking pipe body 1 from the extraction port 111.

[0080] As a specific implementation of the first inclined surface 31, the first inclined surface 31 is an arc-shaped chamfer or a straight edge chamfer, and the second inclined surface 111 is formed accordingly as a spherical inclined surface or a planar inclined surface.

[0081] Based on the above embodiments, see [link to relevant documentation] Figures 10 to 12 The extraction port 11 is located at the bottom of the jacking body 1. Two to three jacking bodies 1 are defined as a propulsion group. The extraction ports 11 on different jacking bodies 1 within each propulsion group are staggered along the circumference of the propulsion group.

[0082] Rock debris is often found in the lower layer of mud. In order to clean up rock debris to the maximum extent, 2-3 pipe jacking bodies 1 are grouped into a propulsion group, so that the extraction port 11 inside each pipe jacking body 1 is opened in a different position, which can clean up rock debris in different positions outside a propulsion group.

[0083] Taking three main pipe jacking units as one propulsion group, refer to [reference]. Figures 10 to 12 ,by Figures 10 to 12 Taking the direction as an example, the dashed arrows represent the left-right direction, and the solid arrows represent the up-down direction. The propulsion group includes three sequentially connected jacking bodies: jacking body A, jacking body B, and jacking body C. The extraction port 11 in jacking body A is located slightly to the right below jacking body A; the extraction port 11 in jacking body B is located directly below jacking body B; and the extraction port 11 in jacking body C is located slightly to the left below jacking body C. The extension paths of the three extraction ports 11 are staggered along the circumference of the propulsion group, covering a 90° area below the propulsion group, thus expanding the rock debris removal range and improving the rock debris removal effect.

[0084] 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 method for preventing jamming during long-distance rock strata pipe jacking and main muck removal, characterized in that, Based on the main pipe jacking assembly, the main pipe jacking assembly includes a main pipe jacking body, a slag discharge cylinder, a top cover, and an extraction device; an extraction port is formed on the lower side of the main pipe jacking body, and the top cover is liftably installed on the extraction port; the slag discharge cylinder is placed inside the main pipe jacking body and has an inlet that connects with the extraction port and an outlet that communicates with the inner cavity of the main pipe jacking body; the extraction device is located on the slag discharge cylinder; The long-distance rock stratum jacking pipe anti-jamming main body muck removal method includes the following steps: Control the descent of the top cover until a gap is formed between the top cover and the lower side of the jacking pipe body, allowing a mixture of rock debris and mud to pass through; The extraction device provides an extraction force to the mixture of rock debris and mud, causing the mixture to flow from the inlet to the outlet. Clean up the mixture of rock debris and mud discharged from the outlet; The central axis of the slag discharge cylinder is parallel to the radial direction of the jacking pipe body. One end of the slag discharge cylinder near the extraction port is defined as the first end, and the other end is defined as the second end. The feed port is located at the first end. The top wall of the slag discharge cylinder has a screw hole. The extraction device includes a rotating shaft and a propeller blade. The rotating shaft is divided into a first section, a second section and a third section from top to bottom. The second section is threaded into the top wall of the slag discharge cylinder, and the outer diameter of the second section is larger than the outer diameter of the first section. The propeller blade is connected to the third section. Controlling the descent of the top cover specifically includes: Rotate the second segment to move it toward the first shaft end, and the third segment drives the top cover to move away from the second shaft end; The extraction device provides an extraction force to the mixture of rock fragments and mud, causing the mixture to flow from the inlet to the outlet, specifically including: The first section rotates in conjunction with the screw hole, causing the top cover to rotate along the axis of the third section, so that the mixture of rock debris and mud enters the slag discharge cylinder along the propeller blade as the propeller blade rotates.

2. The method for preventing jamming during long-distance rock strata pipe jacking and main muck removal as described in claim 1, characterized in that, The extraction device also includes a handle located at the top of the first section, the handle being used to drive the first section to rotate.

3. The method for preventing long-distance rock strata pipe jacking from getting stuck and for main muck removal as described in claim 1, characterized in that, The first shaft end extends outward to form an extension plate, and the curvature of the extension plate is the same as that of the inner wall of the jacking pipe body, and they fit together in a sealed manner.

4. The method for preventing jamming during long-distance rock strata pipe jacking and main muck removal as described in claim 3, characterized in that, A sealing plate is provided between the extension plate and the inner wall of the jacking pipe body.

5. The method for preventing jamming during long-distance rock strata pipe jacking and main muck removal as described in claim 1, characterized in that, The top wall of the slag discharge cylinder is also fixed with a guide tube on the side facing the third section. The guide tube and the screw hole are coaxially arranged, and the guide tube is provided with a thread that matches the screw hole.

6. The method for preventing jamming of long-distance rock strata pipe jacking main body and muck removal as described in claim 1, characterized in that, The outer circumference of the slag discharge cylinder is provided with two guide rails that are arranged opposite to the discharge port. Both guide rails are slidably connected with sealing baffles so that the sealing baffles can slide and cover the discharge port in the circumferential direction of the slag discharge cylinder.

7. The method for preventing jamming during long-distance rock strata pipe jacking and main muck removal as described in claim 1, characterized in that, The side of the top cover slopes inward to form a first inclined surface; The end of the extraction port away from the axis of the jacking pipe body forms a second inclined surface corresponding to the first inclined surface.

8. The method for preventing jamming of long-distance rock strata pipe jacking main body and muck removal as described in claim 1, characterized in that, The extraction port is located at the bottom of the jacking body. Two to three jacking bodies are defined as a propulsion group. The extraction ports on different jacking bodies within each propulsion group are staggered along the circumference of the propulsion group.

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