Muddy water type pipe jacking tunneling device adopting double-channel cutterhead main shaft structure and method

Abstract

The invention provides a muddy water type pipe-jacking tunneling device adopting a double-channel cutterhead main shaft structure, which comprises a tunneling device shell, a main shaft seat, a cutterhead and a cutterhead main shaft, the tunneling device shell is of a cylindrical structure, the outer edge of the tail end of the tunneling device shell is provided with a bell and spigot for a bell and spigot pipeline, the main shaft seat is arranged at the rear half section of the tunneling device shell, and the cutterhead main shaft is arranged on the main shaft seat. The front half section of the tunneling device shell is a muddy water cabin; the cutter head is arranged at the front end of the tunneling device shell; the rear end of the cutterhead main shaft is arranged on the main shaft seat, and the front end is connected with the cutterhead; a plurality of hard alloy cutter blocks are arranged on the soil facing surface of the cutter head; the cutterhead main shaft adopts a large-diameter double-wall structure and consists of an outer shaft and a core tube, and the front end of the outer shaft is connected with the cutterhead and is responsible for driving the cutterhead to rotate; the front end of the core tube is closed, the core tube is fixedly arranged at the axis of the outer shaft, and the inner space of the outer shaft is divided into a core tube hole and a double-wall interlayer channel between the outer wall of the core tube and the inner wall of the outer shaft; the structure is extremely simple, and the technical risk is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of small-bore pipe jacking, and particularly relates to a slurry pipe jacking machine adopting a double-channel cutter head spindle structure and a pipe jacking method adopting the pipe jacking machine. BACKGROUND

[0002] I. Conventional pipe jacking technology and equipment

[0003] The conventional pipe jacking technology is to use a pipe jacking machine to excavate in front of the pipe and use a hydraulic jacking device to jacking behind. The excavated soil can be removed by pipe water circulation, which is called "slurry pipe jacking", or by mechanical means, which is called "mud pipe jacking". The machine body of the pipe jacking machine is divided into two sections, and the deviation correction oil cylinder is used to drive the front section and the rear section to produce an angle, thereby realizing deviation correction and turning.

[0004] This conventional pipe jacking technology is very popular in the field of large-diameter pipe jacking where people can enter the inside of the pipe, and has no obvious defects and pain points, and can cover various geological conditions. Therefore, for large-diameter pipe jacking, the conventional pipe jacking technology and the conventional pipe jacking machine are absolutely mainstream technology and equipment.

[0005] The equipment used by the conventional pipe jacking technology is the conventional pipe jacking machine, which mainly consists of a pipe jacking machine (also known as a pipe jacking machine head) and a hydraulic jacking device. The technical core is mainly in the pipe jacking machine.

[0006] The pipe jacking machine consists of a cutter head and a machine body, and the inside of the machine body has three mechanisms: (1) a rotating mechanism for driving the cutter head to rotate; (2) a deviation correction mechanism for driving the front cabin and the cutter head to turn; and (3) a soil removal mechanism, which is a mud inlet and control valve for a slurry pipe jacking machine, and a mechanical soil removal mechanism for a mud pipe jacking machine.

[0007] II. Defects of conventional pipe jacking technology and equipment in the field of micro pipe jacking

[0008] Micro pipe jacking refers to pipe jacking for laying pipes with an inner diameter of 600 mm or less, i.e. pipe jacking where people cannot enter the inside. The micro pipe jacking machine using the conventional pipe jacking machine technology is called a conventional micro pipe jacking machine, and this micro pipe jacking machine still uses the conventional pipe jacking machine technology, which has many disadvantages, mainly as follows:

[0009] 1. High application risk

[0010] The internal mechanism of the traditional pipe jacking machine has certain complexity, which is not a problem for large-diameter pipe jacking machine. If the internal mechanism fails, the operator can enter the internal mechanism to handle it. However, the micro pipe jacking machine still uses such internal mechanism. If the internal mechanism of the micro pipe jacking machine fails during construction, it is difficult to eliminate the failure, which will cause the failure of the project. This risk is very large.

[0011] 2. Difficulty in direction control

[0012] The torque of the cutter head of the traditional pipe jacking machine is provided from the inside of the machine body, that is, the reaction force of the cutter head torque is applied to the machine body. Due to the small size and light weight of the micro pipe jacking machine, the machine body is easy to reverse when the cutter head encounters sudden resistance changes, making it difficult to control the deviation direction.

[0013] 3. Easy to block the mud discharge pipe

[0014] Due to the limited internal space and complex mechanism of the micro pipe jacking machine, the diameter of the mud inlet and outlet pipe is limited, so the micro pipe jacking machine is prone to mud blockage, which is also a major pain point.

[0015] 4. High construction comprehensive cost

[0016] The "high construction comprehensive cost" mentioned here does not necessarily mean an absolute value, but the cost is not reasonable relative to the diameter:

[0017] (1) High equipment cost

[0018] Due to the difficulty in handling failures, the reliability of the traditional micro pipe jacking machine is extremely high, and the cost is naturally high. For example, the global consensus is that the Japanese products of traditional micro pipe jacking machines are the best, but a micro pipe jacking machine made in Japan costs more than 100 million yen, which is an unacceptable procurement price.

[0019] Moreover, the traditional pipe jacking machine requires one pipe jacking machine for each diameter, so to handle pipes of various diameters, various specifications of pipe jacking machines need to be purchased. The most valuable part of the traditional pipe jacking machine is the pipe jacking machine, which requires a large investment in equipment.

[0020] (2) High requirement for operators, high labor cost

[0021] (3) High cost of working well: due to the long length of the traditional micro pipe jacking machine, the diameter of the working well is usually not less than 3.5 meters, which has a high cost.

[0022] Three, the current status of small-diameter pipe jacking technology:

[0023] In the trenchless pipeline construction technology, compared with the mature directional drilling technology field and large-diameter pipe jacking technology field, small-diameter pipe jacking technology field is still a field with immature technology. Because so far, small-diameter pipe jacking is in a state of coexistence of multiple technologies, and these technologies all have different serious defects, and none of the technologies can cover most of the engineering conditions and geological conditions of small-diameter pipe jacking to become the mainstream technology.

[0024] At present, the construction needs of small-diameter pipe jacking in China have the following ways:

[0025] 1. Traditional micro pipe jacking technology, its defects have been described above.

[0026] 2. Spiral pipe jacking technology, spiral pipe jacking technology has two defects:

[0027] (1) Complex process, complex machine, low efficiency; In addition to the pipe jacking drill main machine and the pipe jacking tunneling machine head, it also needs to configure the pilot rod, the pilot drill bit, the mud discharge casing, the mud discharge spiral rod and other machines. It needs three steps, the first step: pilot through; The second step: top into the mud discharge casing and the spiral rod; The third step: pipe jacking, the process and machine are complex, and the efficiency is low.

[0028] (2) Poor adaptability to strata; It can only be used in uniform soil and sand layers, and cannot cover hard strata, rock layers, gravel-containing strata, miscellaneous filling strata and water-rich sand-containing strata.

[0029] 3. Replace with horizontal directional drilling technology, which has the following defects:

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

[0031] (2) A large amount of mud will be produced, affecting the environment.

[0032] 4. Small to large, change the pipe jacking of the pipeline with a diameter of less than 600mm into a pipeline with a diameter of 800mm.

[0033] Four, summary:

[0034] In the construction of urban rainwater and sewage pipe network, small-diameter pipes account for a larger proportion. So far, there is no mature mainstream technology to rely on in this field, and there is no ideal pipe jacking machine available. Most pipe jacking construction companies are afraid of the risks of small-diameter pipe jacking and directly give up small-diameter pipe jacking business. Many projects that should have used pipe jacking have to be changed to open excavation because they cannot find construction units willing to undertake them. SUMMARY

[0035] The purpose of the present application is to provide a slurry type pipe jacking excavator with a double-channel cutter head spindle structure, which aims at the technical problems raised in the background art and takes the technical route of "out-of-hole driving" as the innovation direction, thereby fundamentally solving the problem that there is no ideal technology and equipment available in the current micro pipe jacking field.

[0036] The technical solutions adopted by the present application are as follows:

[0037] A slurry type pipe jacking excavator with a double-channel cutter head spindle structure is composed of an excavator shell, a spindle seat, a cutter head and a cutter head spindle. The excavator shell is a cylindrical structure, and a socket pipe socket is arranged at the outer edge of the tail end. The spindle seat is arranged at the rear half of the excavator shell, and the front half of the excavator shell is a slurry tank. The cutter head is arranged at the front end of the excavator shell. The rear end of the cutter head spindle is arranged on the spindle seat, and the front end is connected with the cutter head. The earth-facing surface of the cutter head is provided with a plurality of hard alloy blocks.

[0038] The cutter head spindle adopts a large-diameter double-wall structure and is composed of an outer shaft and a core pipe. The front end of the outer shaft is connected with the cutter head and is responsible for driving the cutter head to rotate. The front end of the core pipe is closed and fixedly arranged at the axis of the outer shaft, thereby dividing the internal space of the outer shaft into a core pipe hole and a double-wall interlayer between the outer wall of the core pipe and the inner wall of the outer shaft. A plurality of jetting ports are arranged on the sidewall of the front end of the outer shaft. A plurality of inner sludge discharge ports are arranged on the outer wall of the front end of the core pipe. The outer shaft sidewall and the inner sludge discharge ports are arranged at corresponding positions. The inner sludge discharge ports and the outer sludge discharge ports are connected through a short pipe. A sludge discharge channel is formed from the slurry tank to the core pipe hole, so that the soil in the slurry tank can enter the core pipe hole. At the same time, the slurry transported from the rear to the front along the double-wall interlayer can continue to be transported forward from the gap of the sludge discharge channel short pipe.

[0039] The jetting ports, the inner sludge discharge ports and the outer sludge discharge ports are arranged on the shaft section in the slurry tank. The jetting ports are arranged on the front side of the inner sludge discharge ports and the outer sludge discharge ports.

[0040] Preferably, a split joint is arranged at the front end of the cutter head.

[0041] Preferably, a socket joint outer sleeve is arranged at the rear end of the outer shaft. A plurality of notched holes are arranged at the rear end of the socket joint outer sleeve.

[0042] Preferably, a socket outer octagonal sleeve is arranged at the rear end of the core pipe.

[0043] Preferably, a pair of rectangular lock rod holes are arranged on the socket joint outer sleeve.

[0044] Preferably, the back of the cutter head is provided with several stirring paddles extending to the slurry tank, and the cutter head rotation can stir and mix the sludge and slurry entering the slurry tank, so that the sludge and slurry are more easily discharged from the sludge discharge channel and the blockage is avoided.

[0045] The use of the present application is as follows:

[0046] After the installation of the fixed push drill main machine in the working well, the connection of the pilot drill bit, the completion of the pilot hole drilling work, the removal of the theodolite behind the push drill main machine, the installation of the sludge discharge port joint at the rear end of the drive main shaft, the connection of the sludge discharge pipeline, the lifting of the pipe jacking jumbo into the working well, the placement of the pipe jacking jumbo on the pipe bracket in front of the push drill main machine, the connection of the cutter head front end of the pipe jacking jumbo and the tail end of the pilot drill rod in the pilot hole, and the forward pushing of the pipe jacking jumbo into the soil layer by the push drill main machine power head, the pipe jacking jumbo is connected.

[0047] The large-diameter double-wall drill rod is placed in a pipe joint of the same length, and is hoisted into the working well and placed on the pipe bracket; the large-diameter double-wall drill rod is composed of an outer drill rod and an inner pipe, the inner pipe is fixed at the center of the inner hole of the outer drill rod by a support frame, and the inner space of the outer drill rod is divided into an inner pipe hole and a drill rod double-wall interlayer between the outer wall of the inner pipe and the inner wall of the outer drill rod; the outer diameter of the outer drill rod is the same as that of the cutter head main shaft outer shaft, the front end of the outer drill rod is provided with a socket joint outer sleeve matched with the socket joint outer sleeve, and the socket joint outer sleeve is provided with a bolt hole at the central position of the rectangular lock rod hole after the socket joint; the inner pipe body has the same diameter as the core pipe body, the front end of the inner pipe body is provided with a socket outer octagonal sleeve matched with the socket outer octagonal sleeve at the rear end of the core pipe, and the rear end is provided with a socket outer octagonal sleeve matched with the socket outer octagonal sleeve at the rear end of the core pipe.

[0048] The rear end of the large-diameter double-wall drill rod is connected with the power head main shaft of the push drill main machine, and the front end is connected with the cutter head main shaft rear end of the pipe jacking jumbo, the socket joint outer sleeve of the outer drill rod is inserted into the socket joint outer sleeve at the rear end of the cutter head main shaft, and the socket outer octagonal sleeve at the front end of the inner pipe is inserted into the socket outer octagonal sleeve at the rear end of the core pipe; the lock rod block is embedded in the rectangular lock rod hole, and the lock rod block is fixed in the bolt hole by a bolt, so as to ensure the stable connection between the large-diameter double-wall drill rod and the cutter head main shaft.

[0049] The drive main shaft of the push drill main machine also adopts the same double-wall structure as the large-diameter double-wall drill rod, after the connection is completed, along the cutter head main shaft inner double-wall interlayer of the pipe jacking jumbo, the large-diameter double-wall drill rod inner drill rod double-wall interlayer, and the drive main shaft inner main shaft double-wall interlayer of the push drill main machine, an annular closed grouting channel from the grouting port of the push drill main machine to the jumbo slurry tank is formed; at the same time, along the cutter head main shaft core pipe hole of the pipe jacking jumbo, the large-diameter double-wall drill rod inner pipe hole, and the drive main shaft inner shaft hole of the push drill main machine, an inner hole closed sludge discharge channel from the slurry tank to the main machine sludge discharge port is formed.

[0050] Then the floating top iron of the push jacking rig main machine is started to push the pipe section forward, and the front end of the pipe section is inserted into the socket at the outer edge of the tail end of the tunneling machine shell.

[0051] The push jacking rig main machine drives the main shaft to rotate and push forward, drives the cutter head main shaft to rotate through the large-diameter double-wall drill rod, drives the cutter head to rotate and cut the stratum in front, and forms the sludge into the slurry tank. At the same time, the grouting pump of the mud feeding and discharging system injects water or slurry from the grouting port of the push jacking rig main machine, enters the slurry tank and mixes with the sludge through the annular closed grouting channel formed by the double-wall interlayer in the main shaft of the push jacking rig main machine, the double-wall interlayer in the inner pipe hole of the large-diameter double-wall drill rod, and the double-wall interlayer in the cutter head main shaft of the pipe jacking tunneling machine. The slurry pump of the mud feeding and discharging system sucks outward from the mud discharging port of the push jacking rig main machine along the inner hole closed mud discharging channel formed by the shaft hole in the main shaft of the push jacking rig main machine, the pipe hole in the large-diameter double-wall drill rod, and the core pipe hole in the cutter head main shaft of the pipe jacking tunneling machine, forms suction to the sludge-carrying slurry in the slurry tank, and forms a certain pressure in the slurry tank during the cutter head tunneling process, so that the sludge-carrying slurry enters the inner hole closed mud discharging channel from the slurry tank and is discharged backward.

[0052] After one pipe section is pushed, the pipe section and the drill rod are continuously pushed in according to the above steps, and at the same time, the receiving well is dismantled to the jacked-out pilot drill rod, until the entire pipe laying operation is finally completed.

[0053] The technical effects obtained by the present application are:

[0054] The slurry type pipe jacking tunneling machine provided by the present application has an extremely simple structure, greatly reduces the technical risk, and the driving mechanism is outside the hole, so that the risk of system failure that cannot be eliminated is basically eliminated.

[0055] The present application simplifies the structure of the machine head part of the pipe jacking tunneling machine, greatly reduces the cost of the equipment, and a set of push jacking rig main machine can be equipped with multiple pipe jacking tunneling machine heads of different specifications, so that the pipe jacking operation of different pipe diameters can be realized at a very low cost; at the same time, the driving device does not need to be arranged in the pipe jacking tunneling machine head, and the mud feeding and discharging system does not need to be arranged separately, so that the length of the machine head can be made shorter, the pipe jacking operation can be completed with a smaller working well, and the overall construction cost is further reduced.

[0056] The present application adopts the large-diameter double-wall structure cutter head main shaft and driving drill rod, undertakes the task of grouting channel and mud discharging channel, because the cutter head main shaft and the driving drill rod are always rotating, the internal slurry is in a rolling state, and the pipe is not easy to be blocked during transportation.

[0057] The application provides driving force for the cutter head by the push drill main machine outside the hole, is not limited by the space inside the hole, can provide greater power, can greatly improve construction efficiency, and can meet the construction requirements of hard stratum, rock stratum, stratum containing gravel, miscellaneous filling stratum and water-rich and sand-containing stratum, and greatly improves stratum adaptability.

[0058] The application takes the technical route of "hole outside driving" as the innovation direction, avoids and improves the defects of the traditional micro pipe jacking technology and pipe jacking machine in principle, such as high risk, difficult operation, easy pipe blockage and high comprehensive construction cost, and completely solves the problem that there is no ideal technology and equipment available in the current micro pipe jacking field. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 is a structure schematic view of a slurry type pipe jacking excavator adopting a double-channel cutter head main shaft structure;

[0060] Figure 2 is a working schematic view of the pipe jacking excavator;

[0061] Figure 3 is a structure schematic view of a large-diameter double-wall drill rod.

[0062] Figure 4 is a perspective view of the large-diameter double-wall drill rod.

[0063] In the drawings, the component list represented by each reference sign is as follows:

[0064] 1, excavator shell; 2, main shaft seat; 3, cutter head; 4, cutter head main shaft; 5, socket; 6, slurry tank; 7, hard alloy cutter block; 8, outer shaft; 9, core pipe; 10, core pipe hole; 11, double-wall sandwich; 12, guniting port; 13, inner mud discharge port; 14, outer mud discharge port; 15, transfer joint; 16, socket joint outer sleeve; 17, socket outer octagonal sleeve; 18, rectangular locking rod hole; 19, push drill main machine; 20, driving main shaft; 21, mud discharge port joint; 22, pipe bracket; 23, pilot drill rod; 24, large-diameter double-wall drill rod; 25, pipe joint; 26, outer drill rod; 27, inner pipe; 28, inner pipe hole; 29, drill rod double-wall sandwich; 30, socket joint outer sleeve; 31, engagement block; 32, bolt hole; 33, socket outer octagonal sleeve; 34, locking rod stop block; 35, main shaft double-wall sandwich; 36, grouting port; 37, mud discharge port; 38, stirring paddle; 39, rebate; 40, inner shaft hole. DETAILED DESCRIPTION

[0065] In order to make the purpose and advantages of the application more clear and explicit, the application is specifically described below in combination with examples. It should be understood that the following text is only used to describe one or several specific embodiments of the application, and does not strictly limit the specific protection scope requested by the application.

[0066] Embodiment one:

[0067] The embodiment provides a slurry type pipe jacking excavator with a double-channel cutter head main shaft structure, which is composed of an excavator shell 1, a main shaft seat 2, a cutter head 3 and a cutter head main shaft 4. Figure 1 As shown in the figure, the excavator shell 1 is a cylindrical structure, and the outer edge of the tail end is provided with a socket pipe socket 5; the main shaft seat 2 is arranged at the rear half of the excavator shell 1, and the front half of the excavator shell 1 is a slurry tank 6; the cutter head 3 is arranged at the front end of the excavator shell 1; the rear end of the cutter head main shaft 4 is arranged on the main shaft seat 2, and the front end is connected with the cutter head 3; the earth-facing surface of the cutter head 3 is provided with a plurality of hard alloy blocks 7.

[0068] The cutter head main shaft 4 adopts a large-diameter double-wall structure, which is composed of an outer shaft 8 and a core pipe 9, the front end of the outer shaft 8 is connected with the cutter head 3 and is responsible for driving the cutter head 3 to rotate; the front end of the core pipe 9 is closed and fixedly arranged at the center of the outer shaft 8, thereby dividing the internal space of the outer shaft 8 into a core pipe hole 10 and a double-wall interlayer 11 between the outer wall of the core pipe 9 and the inner wall of the outer shaft 8; a plurality of shotcrete ports 12 are formed in the side wall of the front end of the outer shaft 8; a plurality of inner sludge discharge ports 13 are arranged on the outer wall of the front end of the core pipe 9, and the outer shaft 8 is provided with outer sludge discharge ports 14 corresponding to the positions of the inner sludge discharge ports 13, and the inner sludge discharge ports 13 and the outer sludge discharge ports 14 are connected through a short pipe.

[0069] The shotcrete ports 12, the inner sludge discharge ports 13 and the outer sludge discharge ports 14 are all arranged in the shaft section in the slurry tank 6, and the shotcrete ports 12 are arranged on the front side of the inner sludge discharge ports 13 and the outer sludge discharge ports 14.

[0070] The front end of the cutter head 3 is provided with a distribution joint 15.

[0071] The rear end of the outer shaft 8 is provided with a socket joint outer sleeve 16, and the rear end of the socket joint outer sleeve 16 is provided with a plurality of notched openings.

[0072] The rear end of the core pipe 9 is provided with a socket outer octagonal sleeve 17.

[0073] A pair of rectangular lock rod holes 18 are formed in the socket joint outer sleeve 16.

[0074] The back of the cutter head 3 is provided with a plurality of stirring paddles 38 extending into the slurry tank 6, and the excavator shell 1 is provided with a plurality of stirring paddles 38 extending into the slurry tank 6.

[0075] The use mode of the present application is as follows:

[0076] Referring to Figure 2Install and fix the main jacking drilling rig 19 in the working well, connect the pilot drill bit, and after completing the pilot hole drilling work, remove the theodolite behind the main jacking drilling rig 19. Install the mud discharge port connector 21 at the rear end of the drive spindle 20, connect the mud discharge pipeline, hoist the pipe jacking device of the present invention into the working well, place it on the pipe bracket 22 at the front of the main jacking drilling rig 19 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, and use the power head of the main jacking drilling rig 19 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 driving spindle 20 of the push drill main machine 19 also adopts the same double-wall structure as the large-diameter double-wall drill pipe 24. After connection, along the double-wall interlayer 11 in the cutter head spindle of the pipe jacking machine, the drill pipe double-wall interlayer 29 in the large-diameter double-wall drill pipe, and the spindle double-wall interlayer 35 in the driving spindle of the push drill main machine 19, an annular closed grouting passage from the grouting port 36 of the push drill main machine 19 to the jacking machine slurry tank 6 is formed. At the same time, along the core pipe hole 10 in the cutter head spindle 4 of the pipe jacking machine, the pipe hole 28 in the large-diameter double-wall drill pipe, and the shaft hole 40 in the driving spindle 19 of the push drill main machine, an inner hole closed sludge discharge passage from the slurry tank 6 to the sludge discharge port 37 is formed.

[0080] Then the floating push iron of the push drill main machine 19 is started to tightly push the pipe joint 25 forward, and the pipe joint front end socket is inserted into the socket 5 at the tail end outer edge of the jacking machine shell, so as to keep the pipe joint stable during the jacking process.

[0081] The driving spindle 20 of the push drill main machine 19 rotates and jacks at the same time, drives the cutter head 3 to rotate and cut and crush the front stratum, and forms the slurry into the slurry tank 6. At the same time, the grouting pump of the sludge discharge system injects water or slurry from the grouting port 36 of the push drill main machine 19 into the slurry tank 6 through the annular closed grouting passage formed by the spindle double-wall interlayer 35 in the driving spindle 20 of the push drill main machine, the drill pipe double-wall interlayer 29 in the large-diameter double-wall drill pipe 24, and the double-wall interlayer 11 in the cutter head spindle 4 of the pipe jacking machine; the sludge discharge pump of the sludge discharge system sucks outward from the sludge discharge port 37 of the push drill main machine 19 along the inner hole closed sludge discharge passage formed by the shaft hole 40 in the driving spindle of the push drill main machine 19, the pipe hole 28 in the large-diameter double-wall drill pipe, and the core pipe hole 10 in the cutter head spindle of the pipe jacking machine, forms the slurry in the slurry tank 6 into the inner hole closed sludge discharge passage, and adds the certain pressure in the slurry tank 6 in the jacking process of the cutter head 3, so that the slurry in the slurry tank 6 enters the inner hole closed sludge discharge passage and is discharged backward.

[0082] After one pipe joint is jacked, the pipe joint and drill pipe are added and jacked according to the above steps, and at the same time, the receiving well is dismantled to remove the jacked out pilot drill pipe, until the entire pipe laying operation is finally completed.

[0083] The pipe jacking machine provided by the embodiment has a double-channel cutter head spindle structure, simple structure, greatly reduced technical risk, and driving mechanism outside the hole, which basically eliminates the risk of system failure that cannot be eliminated.

[0084] The embodiment simplifies the structure of the pipe jacking machine head part, greatly reduces the cost of the equipment, a set of pipe jacking machine main machine can be equipped with a plurality of different specifications of pipe jacking machine head, so that the pipe jacking operation of different pipe diameters can be realized at a very low cost; at the same time, the pipe jacking machine head of the application does not need to be provided with a driving device, and a separate sludge inlet and discharge system is also not needed, so that the length of the head can be made shorter, and the pipe jacking operation can be completed in a smaller working well, further reducing the overall construction cost.

[0085] The embodiment adopts a large-diameter double-wall structure cutter head spindle and a driving drill rod to undertake the tasks of slurry inlet channels and sludge discharge channels, because the cutter head spindle and the driving drill rod are always rotating, the internal mud is in a rolling state, and the pipe is not easy to be blocked during transportation.

[0086] The embodiment provides driving force for the cutter head by the pipe jacking machine main machine outside the hole, is not limited by the space inside the hole, can provide greater power, the construction efficiency can be greatly improved, and can meet the construction requirements of hard strata, rock strata, gravel-containing strata, miscellaneous filling strata and water-rich and sand-containing strata, greatly improving the stratum adaptability.

[0087] The embodiment takes the technical route of "hole outside driving" as the innovation direction, avoids and improves the defects of the traditional micro pipe jacking technology and pipe jacking machine in principle, such as high risk, difficult control, easy pipe blockage, and high comprehensive construction cost, and completely solves the problem that there is no ideal technology and equipment available in the current micro pipe jacking field.

[0088] The above only describes the preferred embodiments of the application, and it should be pointed out that for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements should also be considered as the protection scope of the application. The structures, devices and operation methods not specifically described and explained in the application are implemented according to the conventional means in the art, unless otherwise specified and limited.

Claims

1. A slurry-type pipe jacking excavator with a double-channel cutter head main shaft structure, comprising an excavator shell, a main shaft seat, a cutter head and a cutter head main shaft, the excavator shell is a cylindrical structure, and a socket pipe is provided on the outer edge of the tail end, characterized in that: The main shaft seat is arranged at the rear half of the excavator shell, the front half of the excavator shell is a slurry tank, the cutter head is arranged at the front end of the excavator shell, the rear end of the cutter head main shaft is arranged on the main shaft seat, and the front end is connected with the cutter head; the earth-facing surface of the cutter head is provided with a plurality of hard alloy blocks; the cutter head main shaft adopts a large-diameter double-wall structure and is composed of an outer shaft and a core pipe, the front end of the outer shaft is connected with the cutter head and is responsible for driving the cutter head to rotate, the front end of the core pipe is closed and is fixedly arranged at the axis of the outer shaft, thereby dividing the internal space of the outer shaft into a core pipe hole and a double-wall interlayer between the outer wall of the core pipe and the inner wall of the outer shaft, a plurality of shotcrete openings are arranged on the side wall of the front end of the outer shaft, a plurality of inner slurry discharge openings are arranged on the outer wall of the front end of the core pipe, outer slurry discharge openings are arranged at positions corresponding to the inner slurry discharge openings on the side wall of the outer shaft, and the inner slurry discharge openings and the outer slurry discharge openings are communicated through short pipes.

2. The slurry pipe jacking excavator with a double-channel cutterhead main shaft structure according to claim 1, characterized in that: The shotcrete openings, the inner slurry discharge openings and the outer slurry discharge openings are arranged on the shaft section in the slurry tank, and the shotcrete openings are arranged on the front side of the inner slurry discharge openings and the outer slurry discharge openings.

3. The slurry pipe jacking excavator with a double-channel cutterhead main shaft structure according to claim 1, characterized in that: The front end of the cutter head is provided with a split joint.

4. The slurry pipe jacking excavator with a double-channel cutterhead main shaft structure according to claim 1, characterized in that: The rear end of the outer shaft is provided with a socket joint outer sleeve, the rear end of the socket joint outer sleeve is provided with a plurality of notches, the rear end of the core pipe is provided with a socket outer octagonal sleeve, a pair of rectangular locking rod holes are arranged on the socket joint outer sleeve, and the back surface of the cutter head is provided with a plurality of stirring paddles extending into the slurry tank.

5. The slurry pipe jacking excavator with a double-channel cutterhead main shaft structure according to claim 1, characterized in that: The method comprises the following steps:

6. The slurry pipe jacking excavator with double-channel cutter head spindle structure according to claim 4, characterized in that: (1) installing and fixing the main machine of the push drilling machine in the working well, connecting the pilot drill bit, completing the pilot hole drilling work, removing the theodolite behind the main machine of the push drilling machine, installing the slurry discharge opening joint at the rear end of the driving main shaft, connecting the slurry discharge pipeline, hoisting the pipe jacking excavator into the working well, placing the pipe jacking excavator on the pipe bracket in the front part of the main machine of the push drilling machine for connection, and the pipe jacking excavator is composed of an excavator shell, a main shaft seat, a cutter head and a cutter head main shaft, the excavator shell is a cylindrical structure, the outer edge of the tail end is provided with a socket opening for receiving the pipe, and the main shaft seat is arranged at the rear half of the excavator shell, the front half of the excavator shell is a slurry tank, the cutter head is arranged at the front end of the excavator shell, the rear end of the cutter head main shaft is arranged on the main shaft seat, and the front end is connected with the cutter head; the earth-facing surface of the cutter head is provided with a plurality of hard alloy blocks; the cutter head main shaft adopts a large-diameter double-wall structure and is composed of an outer shaft and a core pipe, the front end of the outer shaft is connected with the cutter head and is responsible for driving the cutter head to rotate, the front end of the core pipe is closed and is fixedly arranged at the axis of the outer shaft, thereby dividing the internal space of the outer shaft into a core pipe hole and a double-wall interlayer between the outer wall of the core pipe and the inner wall of the outer shaft, a plurality of shotcrete openings are arranged on the side wall of the front end of the outer shaft, a plurality of inner slurry discharge openings are arranged on the outer wall of the front end of the core pipe, outer slurry discharge openings are arranged at positions corresponding to the inner slurry discharge openings on the side wall of the outer shaft, and the inner slurry discharge openings and the outer slurry discharge openings are communicated through short pipes; the split joint at the front end of the cutter head is connected with the tail end of the pilot drill rod in the pilot hole, the main machine power head of the push drilling machine is used to push the pipe jacking excavator forward into the soil layer; the front end of the cutter head is provided with a split joint; the rear end of the outer shaft is provided with a socket joint outer sleeve, the rear end of the socket joint outer sleeve is provided with a plurality of notches, the rear end of the core pipe is provided with a socket outer octagonal sleeve, a pair of rectangular locking rod holes are arranged on the socket joint outer sleeve, and the back surface of the cutter head is provided with a plurality of stirring paddles extending into the slurry tank.

7. The slurry pipe jacking excavator with double-channel cutter head spindle structure according to claim 1, characterized in that: ​ 8. A slurry pipe jacking method using a double-channel cutter head spindle structure, characterized in that, ​ ​ (2)Put the large diameter double wall drill pipe into the same length of pipe joint, and hoist into the working well together, and place on the pipe bracket; The large diameter double wall drill pipe is composed of outer drill pipe and inner pipe, the inner pipe is fixed in the center of the inner hole of the outer drill pipe by the support frame, which divides the inner space of the outer drill pipe into two passages, the inner pipe hole and the drill pipe double wall interlayer between the outer wall of the inner pipe and the inner wall of the outer drill pipe; The outer drill pipe has the same pipe diameter as the outer shaft of the cutter head main shaft, the front end of the outer drill pipe is provided with a socket joint outer sleeve matched with the socket joint outer sleeve of the cutter head main shaft, and the socket joint outer sleeve is provided with a bolt hole at the central position corresponding to the rectangular lock rod hole after the socket joint; The inner pipe has the same pipe diameter as the core pipe, the front end of the inner pipe is provided with an insertion outer octagonal sleeve matched with the socket outer octagonal sleeve at the rear end of the core pipe, and the rear end is provided with a socket outer octagonal sleeve matched with the rear end of the core pipe; (3)Connect the rear end of the large diameter double wall drill pipe with the power head main shaft of the push drilling machine host, and connect the front end with the rear end of the cutter head main shaft of the pipe jacking machine, insert the socket joint outer sleeve of the outer drill pipe into the socket joint outer sleeve at the rear end of the cutter head main shaft, and insert the insertion outer octagonal sleeve at the front end of the inner pipe into the socket outer octagonal sleeve at the rear end of the core pipe; Embed the lock rod block into the rectangular lock rod hole, and fix the lock rod block at the bolt hole by bolts, so as to ensure the stable connection between the large diameter double wall drill pipe and the cutter head main shaft. (4)The driving main shaft of the push drilling machine host also adopts the same double wall structure as the large diameter double wall drill pipe, after the connection is completed, along the double wall interlayer in the cutter head main shaft of the pipe jacking machine, the drill pipe double wall interlayer in the large diameter double wall drill pipe, and the main shaft double wall interlayer in the driving main shaft of the push drilling machine host, an annular closed grouting passage from the grouting port of the push drilling machine host to the mud tank of the pipe jacking machine is formed; At the same time, along the core pipe hole of the cutter head main shaft of the pipe jacking machine, the inner pipe hole of the large diameter double wall drill pipe, and the inner shaft hole of the driving main shaft of the push drilling machine host, an inner hole closed mud discharge channel from the mud tank to the mud discharge port of the host is formed; (5)Then start the floating push iron of the push drilling machine host to tightly push the pipe joint forward, and socket the front end of the pipe joint to the socket port at the outer edge of the tail end of the pipe jacking machine shell. (6)The driving main shaft of the push drilling machine host rotates and pushes in, drives the cutter head main shaft to rotate through the large diameter double wall drill pipe, drives the cutter head to rotate and cut and crush the front stratum, and forms the sludge into the mud tank. At the same time, the grouting pump of the in and out mud system injects water or slurry from the grouting port of the push drilling machine host, enters the mud tank and mixes with the sludge through the annular closed grouting passage formed by the main shaft double wall interlayer in the driving main shaft of the push drilling machine host, the drill pipe double wall interlayer in the large diameter double wall drill pipe, and the double wall interlayer in the cutter head main shaft of the pipe jacking machine; On the other side, the mud discharge pump of the in and out mud system sucks from the mud discharge port of the push drilling machine host, forms the inner hole closed mud discharge channel along the inner shaft hole of the driving main shaft of the push drilling machine host, the inner pipe hole of the large diameter double wall drill pipe, and the core pipe hole of the cutter head main shaft of the pipe jacking machine, and forms the suction of the sludge carrying mud in the mud tank, plus the certain pressure in the mud tank during the cutter head excavation process, so that the sludge carrying mud in the mud tank enters the inner hole closed mud discharge channel and is discharged backward. (7) After the top of a pipe section, continue to add pipe sections, drill pipes, and top in according to the above steps, at the same time, the receiving well removes the top-out pilot drill pipe until the final completion of the entire pipeline laying operation.

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