A slurry type pipe jacking excavator with a double-channel cutter head main shaft structure

Abstract

The utility model provides a kind of double-channel cutterhead main shaft structure's slurry pipe jacking boring machine, by excavator shell, main shaft seat, cutterhead and cutterhead main shaft constitute, the excavator shell is cylindrical structure, tail end outer edge is equipped with the socket mouth of socket pipeline, the main shaft seat is set in excavator shell second half, excavator shell first half is slurry tank;The cutterhead is set in excavator shell front end;Cutterhead main shaft rear end is set on main shaft seat, front end is connected with cutterhead;The earth-facing surface of the cutterhead is equipped with several hard alloy cutter blocks;Cutterhead main shaft adopts large diameter double-wall structure, is composed of outer shaft and core pipe, outer shaft front end is connected with cutterhead, is responsible for driving cutterhead rotation;The front end of core pipe is closed, fixedly arranged at the axis of outer shaft, the internal space of outer shaft is divided into core pipe hole and double-wall sandwich between core pipe outer wall and outer shaft inner wall two passages;The utility model structure is extremely simple, and technical risk is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of small-diameter pipe jacking machines, specifically relating to a slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure and a pipe jacking method using the same machine. Background Technology

[0002] I. Traditional pipe jacking technology and equipment:

[0003] Traditional pipe jacking technology involves using a pipe jacking machine to excavate in front of the pipeline, while a hydraulic jacking device pushes it from the rear. Excavation can be done using water circulation within the pipeline, known as "slurry pipe jacking," or mechanical methods for direct soil removal, known as "soil pipe jacking." The pipe jacking machine consists of two sections, front and rear. A hydraulic cylinder forces the axes of the front and rear sections to form an angle, thus achieving steering correction.

[0004] This traditional pipe jacking technology is very popular in the field of large-diameter pipe jacking where people can enter the interior. It has no obvious defects or pain points and can cover various geological conditions. Therefore, for large-diameter pipe jacking, traditional pipe jacking technology and traditional pipe jacking machines are the absolute mainstream technology and equipment.

[0005] The equipment used in traditional pipe jacking technology is a traditional pipe jacking machine. It mainly consists of two parts: the pipe jacking machine (also called the pipe jacking machine head) and the hydraulic jacking device. Its core technology lies primarily in the pipe jacking machine.

[0006] The tunnel boring machine consists of two main parts: the cutterhead and the machine body. The machine body has three main internal mechanisms: (1) a rotating mechanism that drives the cutterhead to rotate; (2) a correction mechanism that drives the front chamber to turn with the cutterhead; and (3) a soil discharge mechanism. For slurry tunnel boring machines, this is the mud inlet and outlet pipe and the control valve; for soil tunnel boring machines, this is the mechanical soil discharge mechanism.

[0007] II. Shortcomings of traditional pipe jacking technology and equipment in the field of micro-pipe jacking:

[0008] Miniature pipe jacking refers to pipe jacking used for laying pipes with an inner diameter of 600mm or less, meaning that people cannot enter the pipes inside. Miniature pipe jacking machines that use traditional pipe jacking technology are called traditional miniature pipe jacking machines. These machines still use traditional pipe jacking technology, which has many drawbacks, the main ones of which are as follows:

[0009] 1. High application risk

[0010] Traditional pipe jacking machines have a relatively complex internal structure. This is not a problem for large-diameter pipe jacking machines, as personnel can enter and handle internal malfunctions. However, micro-pipe jacking machines still use this type of internal structure. If a malfunction occurs inside the machine during construction, it becomes very difficult to resolve, potentially leading to project failure. This poses a significant risk.

[0011] 2. High difficulty in steering control

[0012] The torque of the cutterhead of a traditional tunnel boring machine is provided from inside the machine body, meaning that the reaction force of the cutterhead torque acts on the machine body. Because the mini tunnel boring machine is small and lightweight, the machine body is prone to reverse when the cutterhead encounters a sudden change in resistance, making it difficult to control the direction of deviation.

[0013] 3. The sludge discharge pipe is prone to clogging.

[0014] Because of the limited internal space and complex structure of the micro pipe jacking machine, the diameter of the mud inlet and outlet pipes is restricted, so this type of micro pipe jacking machine is prone to mud discharge blockage, which is a very big pain point.

[0015] 4. High overall construction cost

[0016] The "high overall construction cost" mentioned here does not necessarily refer to a high absolute value, but rather to an unreasonable cost relative to the established standards.

[0017] (1) High equipment cost

[0018] Because malfunctions are difficult to handle, traditional miniature pipe jacking machines have extremely high reliability requirements, which naturally leads to high costs.

[0019] Moreover, traditional pipe jacking machines require one machine for each diameter. Therefore, to undertake pipe jacking of various diameters, it is necessary to purchase tunneling machines of various specifications. The most valuable part of a traditional pipe jacking machine is the tunneling machine itself, which requires a relatively large investment in equipment.

[0020] (2) High requirements for operators lead to high labor costs.

[0021] (3) High cost of working shaft: Due to the long body of traditional micro pipe jacking machine, the diameter of the working shaft is usually not less than 3.5 meters, resulting in a high cost.

[0022] III. Current Status of Small-Diameter Pipe Jacking Technology:

[0023] In trenchless pipeline construction technology, compared to the mature directional drilling and large-diameter pipe jacking technologies, small-diameter pipe jacking technology is still an immature field. This is because, currently, multiple technologies coexist in the field of small-diameter pipe jacking, and these technologies all have different serious shortcomings. No single technology can cover the vast majority of engineering situations and geological conditions for small-diameter pipe jacking and has yet to become the mainstream technology.

[0024] Currently, the construction of small-diameter pipe jacking systems in China requires the following approaches:

[0025] 1. The shortcomings of traditional micro-pipe jacking technology have been described above.

[0026] 2. Spiral pipe jacking technology has two major drawbacks:

[0027] (1) The process is complex, the equipment is complicated, and the efficiency is low. In addition to the main body of the jacking drilling rig and the pipe jacking machine head, this technology also requires the configuration of pilot rods, pilot drill bits, mud discharge casings, mud discharge augers and other equipment. It requires three processes: the first step is to guide the penetration; the second step is to push in the mud discharge casing and auger; the third step is to jack the pipe. The process and equipment are complicated and the efficiency is low.

[0028] (2) Poor stratum adaptability; it can only be used for uniform soil and sand layers, and cannot cover hard strata, rock layers, strata containing pebbles and gravel, miscellaneous fill strata and water-rich sandy strata.

[0029] 3. The disadvantages of using horizontal directional drilling technology as an alternative are as follows:

[0030] (1) The elevation accuracy of horizontal directional drilling pipe laying is difficult to meet the accuracy requirements of pipe jacking.

[0031] (2) It will produce a lot of mud, which will affect the environment.

[0032] 4. Convert small pipes to large ones: replace pipes with diameters of 600mm or less with pipes with diameters of 800mm for pipe jacking.

[0033] IV. Overview:

[0034] In the construction of urban stormwater and sewage pipe networks, small-diameter pipes account for a larger proportion. However, to date, there is no mature mainstream technology to rely on in this field, and no ideal pipe jacking machine is available. Most construction companies engaged in pipe jacking are afraid of the risks of small-diameter pipe jacking and directly abandon small-diameter pipe jacking business. Many projects that should have used pipe jacking have had to be changed to open excavation because they cannot find construction companies willing to undertake them. Utility Model Content

[0035] The purpose of this utility model is to provide a slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure. Addressing the technical problems raised in the background technology, it takes the "external drive" technical route as the innovation direction, and avoids and improves the defects of traditional micro pipe jacking technology and pipe jacking machines in principle: high risk, difficult operation, easy pipe blockage, and high overall construction cost. It completely solves the problem that there is no ideal technology and equipment available in the current micro pipe jacking field.

[0036] The specific technical solution adopted by this utility model is as follows:

[0037] A slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure comprises a machine housing, a spindle seat, a cutterhead, and a cutterhead spindle. The machine housing is a cylindrical structure with a socket for inserting pipes at its outer edge at the rear end. The spindle seat is located in the rear half of the machine housing, and the front half of the machine housing is a slurry chamber. The cutterhead is located at the front end of the machine housing. The rear end of the cutterhead spindle is mounted on the spindle seat, and its front end is connected to the cutterhead. The cutterhead's soil-facing surface is provided with several carbide cutter blocks.

[0038] The cutterhead spindle adopts a large-diameter double-wall structure, consisting of an outer shaft and a core tube. The front end of the outer shaft is connected to the cutterhead and is responsible for driving the cutterhead to rotate. The front end of the core tube is closed and fixedly set at the axis of the outer shaft, dividing the internal space of the outer shaft into two channels: the core tube hole and the double-wall sandwich between the outer wall of the core tube and the inner wall of the outer shaft. Several slurry spraying ports are opened on the front side wall of the outer shaft. Several inner mud discharge ports are provided on the front outer wall of the core tube. The outer mud discharge ports are provided at corresponding positions on the side wall of the outer shaft. The inner and outer mud discharge ports are connected by a short pipe, forming a mud discharge channel from the mud-water chamber into the core tube hole, allowing the mud in the mud-water chamber to enter the core tube hole. At the same time, the slurry transported from back to front along the double-wall sandwich can continue to be transported forward through the gap of the short pipe in the mud discharge channel.

[0039] The grouting nozzle, inner mud discharge nozzle, and outer mud discharge nozzle are all located on the shaft section in the mud-water chamber, with the grouting nozzle located in front of the inner mud discharge nozzle and the outer mud discharge nozzle.

[0040] Preferably, the cutter head is provided with a split-type connector at its front end.

[0041] Preferably, the outer shaft has a socket joint outer sleeve at its rear end, and the socket joint outer sleeve has several tongue and groove joints at its rear end.

[0042] Preferably, the rear end of the core tube is provided with an octagonal sleeve with a socket.

[0043] Preferably, the outer sleeve of the socket joint has a pair of rectangular locking rod holes.

[0044] Preferably, the back of the cutter head is provided with several stirring paddles extending into the mud and water chamber. During the rotation and jacking process of the cutter head, the slag and mud entering the mud and water chamber can be stirred and mixed, making it easier to be discharged from the mud discharge channel and preventing blockage.

[0045] The method of using this utility model is as follows:

[0046] Install and fix the main body of the jacking drilling rig in the working well, connect the pilot drill bit, and after completing the pilot hole drilling work, remove the theodolite behind the main body of the jacking drilling rig. Install the mud discharge port connector at the rear end of the drive spindle and connect the mud discharge pipeline. Hoist the pipe jacking device of this utility model into the working well and place it on the pipe bracket at the front of the main body of the jacking drilling rig for connection. Connect the split joint at the front end of the cutterhead to the tail end of the pilot drill rod in the pilot hole. Use the power head of the jacking drilling rig to push the pipe jacking device forward into the soil layer.

[0047] The large-diameter double-walled drill rod is placed inside a pipe section of equal length and hoisted into the working well together, then placed on a pipe support. The large-diameter double-walled drill rod consists of an outer drill rod and an inner tube. The inner tube is held and fixed in the center of the inner hole of the outer drill rod by a support frame, dividing the internal space of the outer drill rod into two channels: the inner tube hole and the double-walled interlayer between the outer wall of the inner tube and the inner wall of the outer drill rod. The outer drill rod has the same diameter as the outer shaft of the cutter head spindle. The front end of the outer drill rod is provided with a spigot connector sleeve that matches the outer sleeve of the socket connector. The spigot connector sleeve has a bolt hole at the center of the rectangular locking rod hole after insertion. The inner tube body has the same diameter as the core tube body. The front end of the inner tube body is provided with a spigot octagonal sleeve that matches the outer octagonal sleeve of the socket at the rear end of the core tube, and the rear end is provided with an outer octagonal sleeve of the same specification as the rear end of the core tube.

[0048] The rear end of the large-diameter double-wall drill rod is connected to the main spindle of the power head of the jacking drilling rig, and the front end is connected to the rear end of the cutterhead spindle of the pipe jacking machine. The outer sleeve of the outer drill rod's spigot connector is inserted into the outer sleeve of the socket connector at the rear end of the cutterhead spindle, and the outer octagonal sleeve of the inner tube's front end is inserted into the outer octagonal sleeve of the socket at the rear end of the core tube. The locking rod stop is embedded in the rectangular locking rod hole, and the locking rod stop is fixed in the bolt hole with bolts, thereby ensuring a stable connection between the large-diameter double-wall drill rod and the cutterhead spindle.

[0049] The drive spindle of the jacking drilling rig also adopts the same double-wall structure as the large-diameter double-wall drill rod. After the connection is completed, a ring-shaped sealed grouting channel is formed from the grouting port of the jacking drilling rig to the mud and water chamber of the tunnel boring machine along the double-wall interlayer inside the cutterhead spindle of the jacking pipe tunneling machine, the double-wall interlayer inside the drill rod of the large-diameter double-wall drill rod, and the double-wall interlayer inside the drive spindle of the jacking drilling rig. At the same time, a sealed inner hole mud discharge channel is formed from the mud and water chamber to the mud discharge port of the jacking drilling rig along the core tube hole of the cutterhead spindle of the jacking pipe tunneling machine, the inner tube hole of the large-diameter double-wall drill rod, and the inner shaft hole of the drive spindle of the jacking drilling rig.

[0050] Then, the floating top iron of the jacking drill rig is started to push the pipe section forward and tighten it, inserting the front end of the pipe section into the socket on the outer edge of the tail end of the tunneling machine housing.

[0051] The main drive shaft of the pusher drilling rig rotates while pushing forward, and the large-diameter double-walled drill rod drives the cutterhead main shaft to rotate, which in turn drives the cutterhead to rotate and cut and break the strata in front, forming slag that enters the mud and water chamber. Meanwhile, the grouting pump of the mud inlet and outlet system injects water or mud into the grouting port of the jacking drilling rig main unit. This mud is then introduced into the mud-water chamber and mixed with the excavated soil through the annular closed grouting channel formed by the double-walled interlayer of the main shaft, the double-walled interlayer of the large-diameter double-walled drill rod, and the double-walled interlayer of the cutterhead main shaft of the jacking drilling rig main unit. On the other hand, the mud discharge pump of the mud inlet and outlet system draws outward from the mud discharge port of the jacking drilling rig main unit. This mud is then drawn into the inner closed mud discharge channel formed by the inner shaft hole of the main shaft, the inner pipe hole of the large-diameter double-walled drill rod, and the core pipe hole of the cutterhead main shaft of the jacking drilling rig main unit. This process draws the excavated mud in the mud-water chamber. In addition, the pressure generated in the mud-water chamber during the cutterhead excavation process causes the excavated mud to enter the inner closed mud discharge channel and be discharged backward.

[0052] After one pipe section is jacked up, the above steps are repeated to add more pipe sections and drill rods for jacking up. At the same time, the pilot drill rod that was jacked up is removed from the receiving well until the entire pipeline laying operation is finally completed.

[0053] The technical effects achieved by this utility model are as follows:

[0054] This utility model provides a slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure. The structure is extremely simple, the technical risks are greatly reduced, and the drive mechanism is all outside the hole, which basically eliminates the risk of system failure that cannot be eliminated.

[0055] This invention simplifies the structure of the tunnel boring machine head, greatly reducing equipment costs. One set of jacking drilling rig can be equipped with multiple tunnel boring machine heads of different specifications, thus achieving tunnel jacking operations adapted to different pipe diameters at a very low cost. At the same time, the tunnel boring machine head of this invention does not require a drive device or a separate mud inlet / outlet system, so the head length can be made shorter, and tunnel jacking operations can be completed with a smaller working shaft, further reducing the overall construction cost.

[0056] This utility model adopts a large-diameter double-wall structure cutterhead spindle and drive drill rod to undertake the tasks of slurry inlet channel and mud outlet channel. Because the cutterhead spindle and drive drill rod are constantly rotating, the slurry inside is in a rolling state, making it less likely to block the pipe during transportation.

[0057] This invention provides driving force to the cutterhead through the main body of the jacking drill outside the hole, which is not limited by the space inside the hole. It can provide greater power, greatly improve construction efficiency, and meet the construction requirements of hard strata, rock strata, strata containing pebbles and gravels, miscellaneous fill strata and water-rich sandy strata, greatly improving the adaptability of strata.

[0058] This utility model takes the "external drive" technical route as its innovation direction, and avoids and improves the defects of traditional micro pipe jacking technology and pipe jacking machines in principle: high risk, difficult operation, easy pipe blockage, and high overall construction cost. It completely solves the problem that there is no ideal technology and equipment available in the current micro pipe jacking field. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the structure of a slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure according to this utility model;

[0060] Figure 2 This is a working diagram of the present invention for pipe jacking operations;

[0061] Figure 3 This is a schematic diagram of a large-diameter double-walled drill pipe.

[0062] Figure 4 It is a 3D view of a large-diameter double-walled drill pipe.

[0063] The attached diagram lists the components represented by each number as follows:

[0064] 1. Tunnel boring machine housing; 2. Spindle seat; 3. Cutterhead; 4. Cutterhead spindle; 5. Socket; 6. Mud chamber; 7. Carbide cutter block; 8. Outer shaft; 9. Core tube; 10. Core tube hole; 11. Double-walled sandwich layer; 12. Slurry nozzle; 13. Inner mud discharge port; 14. Outer mud discharge port; 15. Diverter joint; 16. Socket joint outer sleeve; 17. Socket outer octagonal sleeve; 18. Rectangular locking rod hole; 19. Top thrust drilling rig main unit; 20. Drive spindle; 21. Discharge... 21. Mud joint; 22. Pipe support; 23. Pilot drill rod; 24. Large-diameter double-wall drill rod; 25. Pipe section; 26. Outer drill rod; 27. Inner pipe; 28. Inner pipe hole; 29. ​​Double-wall sandwich of drill rod; 30. Spigot joint outer sleeve; 31. Engaging block; 32. Bolt hole; 33. Outer octagonal sleeve of spigot; 34. Locking rod stop block; 35. Double-wall sandwich of spindle; 36. Grouting port; 37. Mud discharge port; 38. Agitator; 39. Tongue and groove; 40. Inner shaft hole. Detailed Implementation

[0065] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0066] Example 1:

[0067] This embodiment provides a slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure. The structure consists of... Figure 1 As shown, the tunneling machine consists of a tunneling machine housing 1, a spindle seat 2, a cutterhead 3, and a cutterhead spindle 4. The tunneling machine housing 1 is a cylindrical structure with a socket 5 for inserting a pipe on the outer edge of its tail end. The spindle seat 2 is located in the rear half of the tunneling machine housing 1, and the front half of the tunneling machine housing 1 is a mud and water chamber 6. The cutterhead 3 is located in the front end of the tunneling machine housing 1. The rear end of the cutterhead spindle 4 is located on the spindle seat 2, and the front end is connected to the cutterhead 3. The soil-facing surface of the cutterhead 3 is provided with several carbide cutter blocks 7.

[0068] The cutter head spindle 4 adopts a large-diameter double-wall structure, consisting of an outer shaft 8 and a core tube 9. The front end of the outer shaft 8 is connected to the cutter head 3 and is responsible for driving the cutter head 3 to rotate. The front end of the core tube 9 is closed and fixedly set at the axis of the outer shaft 8, dividing the internal space of the outer shaft 8 into two channels: a core tube hole 10 and a double-wall sandwich layer 11 between the outer wall of the core tube 9 and the inner wall of the outer shaft 8. Several spray nozzles 12 are opened on the front side wall of the outer shaft 8. Several inner mud discharge ports 13 are provided on the front outer wall of the core tube 9. The outer mud discharge ports 14 are provided on the side wall of the outer shaft 8 at corresponding positions to the inner mud discharge ports 13. The inner mud discharge ports 13 and the outer mud discharge ports 14 are connected by a short pipe.

[0069] The grouting nozzle 12, the inner mud discharge nozzle 13, and the outer mud discharge nozzle 14 are all located on the shaft section in the mud and water chamber 6, with the grouting nozzle 12 located in front of the inner mud discharge nozzle 13 and the outer mud discharge nozzle 14.

[0070] The cutter head 3 is provided with a split-type connector 15 at its front end.

[0071] The outer shaft 8 is provided with a socket joint sleeve 16 at its rear end, and the socket joint sleeve 16 is provided with several tongue and groove joints at its rear end.

[0072] The core tube 9 is provided with an octagonal sleeve 17 at the rear end.

[0073] The outer sleeve 16 of the socket joint is provided with a pair of rectangular locking rod holes 18.

[0074] The back of the cutter head 3 is provided with several stirring paddles 38 extending to the mud and water chamber 6. During the rotation and jacking process of the cutter head, it can stir and mix the slag and mud entering the mud and water chamber, making it easier to be discharged from the mud discharge channel and preventing blockage.

[0075] The method of using this utility model is as follows:

[0076] See Figure 2 Install and fix the main body 19 of the jacking drill rig in the working well, connect the pilot drill bit, and after completing the pilot hole drilling work, remove the theodolite behind the main body 19 of the jacking drill rig. Install the mud discharge port connector 21 at the rear end of the drive spindle 20 and connect the mud discharge pipeline. Hoist the pipe jacking device of this utility model into the working well and place it on the pipe bracket 22 at the front of the main body 19 of the jacking drill rig for connection. Connect the split joint 15 at the front end of the cutterhead 3 to the tail end of the pilot drill rod 23 in the pilot hole. Use the power head of the main body 19 of the jacking drill rig to push the pipe jacking device forward into the soil layer.

[0077] The large-diameter double-walled drill pipe 24 is placed inside a pipe section 25 of equal length and hoisted into the working shaft together, then placed on the pipe support 22; Figure 3 and Figure 4 As shown, the large-diameter double-walled drill rod 24 consists of an outer drill rod 26 and an inner tube 27. The inner tube 27 is held and fixed in the center of the inner hole of the outer drill rod 26 by a support frame, dividing the internal space of the outer drill rod 26 into two channels: an inner tube hole 28 and a double-walled interlayer 29 between the outer wall of the inner tube 27 and the inner wall of the outer drill rod 26. The outer drill rod 26 has the same diameter as the outer shaft 8 of the cutter head spindle 4. The front end of the outer drill rod 26 is provided with a socket connector sleeve 30 that matches the socket connector sleeve 16. The socket connector sleeve 30 is provided with a... The socket joint sleeve 16 has a matching engagement block 31 that matches the tongue and groove 39. The plug joint sleeve 30 has a bolt hole 32 at the center of the rectangular locking rod hole 18 after insertion. The rear end of the outer drill rod 26 has a socket joint sleeve 16 of the same specification as the outer shaft 8. The inner tube 27 has the same diameter as the core tube 9. The front end of the inner tube 27 has a plug octagonal sleeve 33 that matches the socket octagonal sleeve 17 at the rear end of the core tube 9. The rear end has a socket octagonal sleeve 17 of the same specification as the rear end of the core tube 9.

[0078] The rear end of the large-diameter double-wall drill rod 24 is connected to the power head spindle of the jacking drilling rig main unit 19, and the front end is connected to the rear end of the cutterhead spindle 4 of the pipe jacking machine. The outer sleeve 30 of the outer drill rod 26 is inserted into the outer sleeve 16 of the socket joint at the rear end of the cutterhead spindle 4. The outer octagonal sleeve 33 of the inner tube 27 is inserted into the outer octagonal sleeve 17 of the socket at the rear end of the core tube 9. The locking rod stop 34 is embedded in the rectangular locking rod hole 18 and fixed in the bolt hole with bolts, thereby ensuring a stable connection between the large-diameter double-wall drill rod and the cutterhead spindle 4.

[0079] The drive spindle 20 of the jacking drill rig host 19 also adopts the same double-wall structure as the large-diameter double-wall drill rod 24. After the connection is completed, a ring-shaped closed grouting channel is formed from the grouting port 36 of the jacking drill rig host 19 to the mud and water chamber 6 of the tunnel boring machine along the double-wall interlayer 11 inside the cutterhead spindle of the jacking drill, the double-wall interlayer 29 inside the drill rod of the large-diameter double-wall drill rod, and the double-wall interlayer 35 inside the drive spindle of the jacking drill rig host 19. At the same time, a closed inner hole mud discharge channel is formed from the mud and water chamber 6 to the mud discharge port 37 along the core tube hole 10 of the cutterhead spindle 4 of the jacking drill, the inner tube hole 28 inside the large-diameter double-wall drill rod, and the inner shaft hole 40 inside the drive spindle of the jacking drill rig host 19.

[0080] Then, the floating top iron of the jacking drill rig 19 is started to push the pipe section 25 forward and insert the front end of the pipe section into the socket 5 on the outer edge of the end of the tunneling machine housing, thereby maintaining the stability of the pipe section during the jacking process.

[0081] The drive spindle 20 of the jacking drill rig 19 rotates and pushes forward, driving the cutterhead spindle 4 to rotate through the large-diameter double-walled drill rod 24, which in turn drives the cutterhead 3 to rotate and cut and break the strata in front, forming slag that enters the mud and water chamber 6. Meanwhile, the grouting pump of the mud inlet and outlet system injects water or mud into the grouting port 36 of the jacking drill rig main body 19. The mud is then mixed with the slag in the mud-water chamber 6 through the annular closed grouting channel formed by the double-walled interlayer 35 of the main shaft 20 driven by the jacking drill rig main body, the double-walled interlayer 29 of the drill rod 24 driven by the drill rod 24, and the double-walled interlayer 11 of the cutterhead main shaft 4 of the pipe jacking machine. On the other hand, the mud discharge pump of the mud inlet and outlet system draws outward from the mud discharge port 37 of the jacking drill rig main body 19. The mud is then discharged through the inner closed mud discharge channel formed by the inner shaft hole 40 of the main shaft driven by the jacking drill rig main body 19, the inner pipe hole 28 of the large-diameter double-walled drill rod, and the core pipe hole 10 of the cutterhead main shaft of the pipe jacking machine. This suctions the slag-carrying mud in the mud-water chamber 6. In addition, the pressure formed in the mud-water chamber 6 during the excavation of the cutterhead 3 causes the slag-carrying mud to enter the inner closed mud discharge channel from the mud-water chamber 6 and be discharged backward.

[0082] After one pipe section is jacked up, the above steps are repeated to add more pipe sections and drill rods for jacking up. At the same time, the pilot drill rod that was jacked up is removed from the receiving well until the entire pipeline laying operation is finally completed.

[0083] This embodiment provides a slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure. The structure is extremely simple, the technical risks are greatly reduced, and the drive mechanism is all outside the hole, which basically eliminates the risk of system failure that cannot be eliminated.

[0084] This embodiment simplifies the structure of the tunnel boring machine head, greatly reducing the cost of the equipment. One set of jacking drilling rig main unit can be equipped with multiple tunnel boring machine heads of different specifications, thereby achieving tunnel jacking operations adapted to different pipe diameters at a very low cost. At the same time, the tunnel boring machine head of this utility model does not require a drive device or a separate mud inlet and outlet system. Therefore, the head length can be made shorter, and tunnel jacking operations can be completed with a smaller working shaft, further reducing the overall construction cost.

[0085] This embodiment uses a large-diameter double-walled cutterhead spindle and drive drill rod to serve as the slurry inlet and outlet channels. Because the cutterhead spindle and drive drill rod are constantly rotating, the slurry inside is in a tumbling state, making it less prone to pipe blockage during transport.

[0086] In this embodiment, the main body of the jacking drill outside the hole provides driving force for the cutterhead, which is not limited by the space inside the hole. It can provide greater power, greatly improve construction efficiency, and cover the construction requirements of hard strata, rock strata, strata containing pebbles and gravels, miscellaneous fill strata and water-rich sandy strata, greatly improving the adaptability of strata.

[0087] This embodiment takes the "external drive" technical route as its innovative direction, and avoids and improves the defects of traditional micro pipe jacking technology and pipe jacking machines in principle: high risk, difficult operation, easy pipe blockage, and high overall construction cost. It completely solves the problem that there is no ideal technology and equipment available in the current field of micro pipe jacking.

[0088] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A slurry-type pipe jacking machine employing a dual-channel cutterhead spindle structure, comprising a machine housing, a spindle seat, a cutterhead, and a cutterhead spindle, wherein the machine housing is a cylindrical structure with a socket for inserting a pipe at its outer edge at the tail end, characterized in that: The main shaft seat is located in the rear half of the tunnel boring machine (TBM) housing, and the front half of the TBM housing is a mud and water chamber. The cutterhead is located at the front end of the TBM housing. The rear end of the cutterhead main shaft is located on the main shaft seat, and the front end is connected to the cutterhead. The cutterhead's soil-facing surface is provided with several carbide cutter blocks. The cutterhead main shaft adopts a large-diameter double-wall structure, consisting of an outer shaft and a core tube. The front end of the outer shaft is connected to the cutterhead and is responsible for driving the cutterhead to rotate. The front end of the core tube is closed and fixedly located at the axis of the outer shaft, dividing the internal space of the outer shaft into two channels: a core tube hole and a double-walled interlayer between the outer wall of the core tube and the inner wall of the outer shaft. Several grouting ports are opened on the front end side wall of the outer shaft. Several inner mud discharge ports are provided on the front end outer wall of the core tube, and outer mud discharge ports are provided on the outer shaft side wall at positions corresponding to the inner mud discharge ports. The inner and outer mud discharge ports are connected by a short pipe.

2. The slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure according to claim 1, characterized in that: The grouting nozzle, inner mud discharge nozzle, and outer mud discharge nozzle are all located on the shaft section in the mud-water chamber, with the grouting nozzle located in front of the inner mud discharge nozzle and the outer mud discharge nozzle.

3. A slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure according to claim 1, characterized in that: The cutter head is equipped with a split-type connector at its front end.

4. A slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure according to claim 1, characterized in that: The outer shaft is provided with a socket joint outer sleeve at its rear end, and the socket joint outer sleeve is provided with several tongue and groove joints at its rear end.

5. A slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure according to claim 1, characterized in that: The core tube is provided with an octagonal socket sleeve at the rear end.

6. A slurry-type pipe jacking machine with a dual-channel cutterhead spindle structure according to claim 4, characterized in that: The outer sleeve of the socket joint has a pair of rectangular locking rod holes.

7. The slurry pipe jacking excavator with double-channel cutter head spindle structure according to claim 1, characterized in that: The back of the cutter head is provided with several agitators that extend into the mud chamber.

Images