Two-way jacking butt joint and disassembly method of pipe jacking machine suitable for hard rock stratum

Abstract

According to the pipe jacking machine two-way jacking butt joint and disassembly method suitable for the hard rock stratum, pipe jacking machines are arranged in working wells at the two ends of a hard rock stratum construction path correspondingly, and a pipe jacking machine head I of one pipe jacking machine and a pipe jacking machine head II of the other pipe jacking machine are brought into a steel jacking pipe in the opposite tunneling process; comprising the following steps that S1, in the opposite tunneling process of a pipe jacking machine head I and a pipe jacking machine head II, the deviation of the jacking axes of the pipe jacking machine head I and the pipe jacking machine head II is measured and corrected in real time; s2, when the pipe jacking machine head I and the pipe jacking machine head II are close to each other and the hard rock stratum on the construction path is not completely communicated, the two pipe jacking machines are shut down for the first time, and a cutterhead assembly and an internal structure of the pipe jacking machine head II are disassembled; according to the method, by means of the geological characteristics of the hard rock stratum, accurate butt joint and penetration of the tunnels on the two sides can be smoothly achieved, the stability of the surrounding rock stratum is not affected, meanwhile, the pipe jacking machine can be safely and efficiently dismantled, and the steel jacking pipes on the two sides are well connected.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering construction, and in particular to a bidirectional jacking, docking and disassembling method of a pipe jacking machine suitable for hard rock formations. Background Art

[0002] Pipe jacking construction is a trenchless construction method, a pipeline burial construction technology that does not involve excavation or requires minimal excavation. Pipe jacking construction is to use the jacking force generated by the jacking equipment in the working pit to overcome the friction between the pipeline and the surrounding soil, push the pipeline into the soil according to the designed slope, and transport the soil away. After one section of the jacking pipe is pushed into the soil layer, the second section of the jacking pipe will continue to push in. Trenchless engineering technology completely solves the problems of damage to urban buildings and road traffic congestion during pipeline burial construction, and highlights its advantages in stabilizing the soil layer and protecting the environment.

[0003] In hard rock formations, the bidirectional simultaneous jacking pipe construction method can be used, which can effectively shorten the project cycle. However, the hardness of hard rock formations is high and the construction is difficult. Specifically, there are the following problems: (1) Before the tunnel is penetrated, the stopping position of the pipe jacking machine head needs to be precisely controlled. If the machine head stops too early, the hard rock will not be easily penetrated. If the machine head stops too late, the cutter heads of the two pipe jacking machine heads may collide, which will affect the stability of the surrounding rock formations and the safety of subsequent pipeline construction. Therefore, docking is difficult.

[0004] (2) Traditional pipe jacking machine docking is mostly done under soil conditions. A receiving well can be set up at the predetermined docking position. After the pipe jacking machine heads on both sides reach the receiving well, the pipe jacking machine heads are hoisted out and the pipe jacking is pushed empty to complete the docking. Since it is not easy to set up a receiving well in hard rock formations, the pipe jacking machine heads can only be disassembled and sent out. However, after the tunnel is penetrated, disassembling the pipe jacking machine heads on both sides at the same time will be restricted by the narrow space inside the pipe jacking machine heads and the steel pipe jacking. Parts are easily accumulated during the disassembly process, which is not conducive to transportation.

[0005] (3) After the tunnel is penetrated, the steel jacking pipes brought in by the jacking machine heads on both sides may have deviations in their axes, making them difficult to connect.

[0006] Therefore, the present invention proposes a bidirectional jacking connection and removal method for a pipe jacking machine suitable for hard rock formations, which meets the tunnel design requirements and improves construction efficiency. Summary of the invention

[0007] The purpose of the present invention is to propose a bidirectional jacking connection and disassembly method for a pipe jacking machine suitable for hard rock formations. By utilizing the geological characteristics of the hard rock formations, the accurate connection and penetration of the tunnels on both sides can be smoothly achieved without affecting the stability of the surrounding rock formations. At the same time, the pipe jacking machine can be safely and efficiently dismantled, and the steel jacking pipes on both sides can be better connected.

[0008] The technical solution adopted by the present invention is: a two-way jacking docking and disassembly method for a pipe jacking machine suitable for hard rock formations, wherein pipe jacking machines are respectively arranged in working wells at both ends of a construction path of a hard rock formation, and a pipe jacking machine head I of one pipe jacking machine and a pipe jacking machine head II of another pipe jacking machine respectively bring in steel jacking pipes during the process of excavating in opposite directions; the method comprises the following steps: S1. During the process of the jacking machine head I and the jacking machine head II excavating toward each other, the deviation of the jacking axes of the two is measured and corrected in real time; S2, when the pipe jacking machine head I and the pipe jacking machine head II are close to each other and the hard rock formation on the construction path is not completely penetrated, the two pipe jacking machines are stopped for the first time, the cutter head assembly and the internal structure of the pipe jacking machine head II are disassembled, and the outer shell of the pipe jacking machine head II is retained as a connecting pipe; S3, resuming the propulsion of the pipe jacking machine head I to break the last section of rock mass between the two pipe jacking machines, when the cutter head assembly of the pipe jacking machine head I and the outer shell of the pipe jacking machine head II are in contact and completely penetrated, the pipe jacking machine head I is stopped for the second time, and the cutter head assembly, internal structure and outer shell of the pipe jacking machine head I are disassembled; S4. A trumpet-shaped corrugated pipe is arranged at the position where the pipe jacking machine head I stops for the second time, and two ends of the trumpet-shaped corrugated pipe are respectively welded to the outer shell of the pipe jacking machine head II and the steel jacking pipe brought in by the pipe jacking machine head I.

[0009] As a preferred solution, in S1, when measuring the jacking axis deviation, real-time monitoring is performed by a laser theodolite, and manual verification is performed periodically. After the measurement, a small angle and multi-frequency deviation correction method is used to slowly correct the jacking machine head I and the jacking machine head II until the axes coincide before penetration; in: During real-time monitoring, a laser theodolite arranged in advance in the working well is used to monitor the laser receiving plate arranged on the pipe jacking machine head I or the pipe jacking machine head II; Manual review every 10m of advancement; During manual verification, a positioning point is set with reference to the working well, and the coordinates of the center of the target on the pipe jacking machine head I or the pipe jacking machine head II are verified using a total station arranged in the working well.

[0010] As a preferred solution, when disassembling the internal structure of pipe jacking head I or the internal structure of pipe jacking head II, the following steps are performed: drain the water in the mud and water pipeline and disassemble the mud and water pipeline system, disassemble the correction oil system including the correction jack, and disassemble the cutter head assembly drive system.

[0011] As a preferred solution, disassembling the cutter disc assembly includes cutting off the cutter disc, the cutter disc seat and the chest plate behind the cutter disc; Before disassembling the chest plate behind the cutter disc, the front and rear sides of the chest plate behind the cutter disc are fixed with steel diagonal braces, and then the construction workers cut it into pieces and transport it outside the working pit via a flatbed truck in the steel jacking pipe.

[0012] As a preferred solution, in S3, when disassembling the cutter head assembly and the internal structure of the pipe jacking machine head I, the cutter head assembly and the internal structure are disassembled and cut off from both ends of the pipe jacking machine head I at the same time.

[0013] As a preferred solution, when disassembling the internal structure of the pipe jacking machine head I and the pipe jacking machine head II, lifting ears are welded inside the outer shell of the pipe jacking machine head I and the pipe jacking machine head II and a hand winch is installed, and the disassembled and cut parts are removed by the hand winch.

[0014] As a preferred solution, in S3, when breaking the last section of rock mass between the two pipe jacking machines, the excavation pressure and excavation speed of the pipe jacking machine head I are reduced.

[0015] As a preferred solution, in S4, the trumpet-shaped corrugated pipe is pre-divided and processed into several small arc-shaped plates, and the arc-shaped plates are sent to the second shutdown position through steel jacking pipes and assembled into shape, the end of the trumpet-shaped corrugated pipe with a larger diameter is welded to the end of the outer shell of the jacking machine head II, and the end of the trumpet-shaped corrugated pipe with a smaller diameter is welded to the steel jacking pipe brought in by the jacking machine head I, so that the steel jacking pipes brought in by the jacking machines on both sides are connected after being connected through the trumpet-shaped corrugated pipe and the outer shell of the jacking machine head II.

[0016] As a preferred solution, when assembling the trumpet-shaped corrugated pipe, adjacent arc plates are connected by bolts, the arc plates and the steel jacking pipe or the arc plates and the outer shell of the jacking pipe head II are welded, and water-stop strips are provided at the connecting seams.

[0017] As a preferred solution, after the trumpet-shaped corrugated pipe is welded, cement mortar is injected into the gap between the pipe jacking machine head II and its rear end steel jacking pipe through the grouting holes on the outer shell of the pipe jacking machine head II to meet the structural strength and waterproof requirements.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) For the bidirectional jacking of steel pipes in hard rock formations, the internal structure and cutterhead assembly of one of the pipe jacking machines are first removed, and the hollow outer shell is retained. When removing the last section of rock, the cutterhead of one pipe jacking machine head is opposite to the hollow outer shell of the other pipe jacking machine head, which can avoid cutterhead collision, does not affect the safety of the subsequent construction environment, and reduces the difficulty of control.

[0019] (2) The hollow shell of the retained pipe jacking machine is used as a connecting pipe, which is matched with the trumpet-shaped corrugated pipe to realize the connection between the steel jacking pipes on both sides. The moderate deformation characteristics of the trumpet-shaped corrugated pipe can be used to effectively connect the steel jacking pipes at both ends even when there is a certain axial deviation, thus meeting the structural strength and waterproof requirements; When dismantling the pipe jacking machine head under normal soil conditions, the surrounding soil needs to be reinforced. However, the hard rock formation is strong, and the outer shell of the pipe jacking machine head I can be dismantled directly without the need to reinforce the surrounding rock formation, which is conducive to shortening the construction period of the trumpet-type corrugated pipe.

[0020] (3) In hard rock formations, the jacking machine head can be disassembled and recycled by disassembling and cutting, which can ensure the construction progress and control the investment; The internal components of the rock pipe jacking machine are very large in size and mass, the internal space is small, and the disassembly process of the pipe jacking head is complicated. By optimizing the disassembly process of the pipe jacking head at the left and right ends, the disassembly speed of the pipe jacking head is effectively improved, and the engineering efficiency is improved.

[0021] (4) When bidirectional jacking is performed in hard rock formations, due to the strong bearing capacity of the surrounding rock mass, during the dismantling construction, after the jacking head II is dismantled, the construction personnel can directly enter the front of the jacking head I and dismantle it from both ends at the same time, thereby improving the dismantling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the jacking axis control method of the present invention; Figure 2 The relative position relationship between the pipe jacking machine head I and the pipe jacking machine head II of the present invention when they are 1m apart; Figure 3 This is a schematic diagram of the internal structure of the pipe jacking machine head used in the present invention; Figure 4 It is a schematic diagram of the connection between the steel jacking pipe on the left side and the steel jacking pipe tunnel on the right side of the present invention; Figure 5 It is a connection schematic diagram of the trumpet-shaped bellows of the present invention.

[0024] Figure numerals: 1. Pipe jacking machine head I, 2. Pipe jacking machine head II, 3. Steel jacking pipe, 4. Cutter head, 5. Gap between the pipe jacking machine head and the steel jacking pipe at the rear end, 6. Rock mass in front of the excavation face, 7. Main jack, 8. Rear backrest, 9. Positioning point, 10. Jacking axis, 11. Bull's eye, 12. Laser theodolite, 13. Laser receiving plate, 14. Correction jack, 15. Last section of rock mass, 16. Cutter head seat, 17. Breast plate behind the cutter head, 18. Planetary reducer, 19. Main drive gear box, 20. Drive motor, 21. Correction oil pump station, 22. Oil pipe, 23. Distribution box, 24. Slurry inlet pipe, 25. Slurry discharge pipe, 26. Mud and water bypass valve, 27. Steel structure diagonal brace, 28. Hard rock formation, 29. Trumpet-shaped bellows, 30. Connection seam, 31. Connecting bolts. DETAILED DESCRIPTION

[0025] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0026] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this document shall have the usual meanings understood by people with ordinary skills in the field to which the invention belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of the present invention do not express quantity restrictions, but indicate the existence of at least one; the words "first", "second" and "third" used in this document shall not be regarded as restrictions on the order of components, but are only used to distinguish different components; words such as "include" or "comprise" and the like indicate that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, but do not exclude other elements or objects with the same function.

[0027] In order to more clearly describe the bidirectional jacking and disassembly method of the pipe jacking machine suitable for hard rock formations, combined with the attached Figure 1-5 Describe this embodiment: A two-way jacking docking and disassembly method for a pipe jacking machine suitable for hard rock formations, wherein pipe jacking machines are respectively arranged in working wells at both ends of a construction path of a hard rock formation 28, a pipe jacking machine head Ⅰ1 of one pipe jacking machine and a pipe jacking machine head Ⅱ2 of another pipe jacking machine respectively bring in a steel jacking pipe 3 during the process of excavating in opposite directions, a cutter head 4 of the pipe jacking machine head (including the pipe jacking machine head Ⅰ1 and the pipe jacking machine head Ⅱ2) excavates toward a rock mass 7 in front of an excavation face, a rear backrest 8 is arranged in the working well, and a main jack 7 uses the rear backrest 8 to push the steel jacking pipe 3 into the tunnel; The following steps are involved: S1. During the process of the jacking machine heads Ⅰ1 and Ⅱ2 heading towards each other, the deviation of the jacking axes of the two is measured and corrected in real time; Specifically, during the process of two pipe jacking machines excavating toward each other, the deviation of the jacking axis 10 of each of the pipe jacking machine head Ⅰ1 and the pipe jacking machine head Ⅱ2 is measured, and the deviation is continuously corrected by the correction jack 14 in the pipe jacking machine; When measuring the deviation of the jacking axis 10, the laser theodolite 12 is used for real-time monitoring and periodic manual verification. After the measurement, the jacking machine head Ⅰ1 and the jacking machine head Ⅱ2 are slowly corrected to coincide with the axis before penetration by means of small angle and multi-frequency correction. During real-time monitoring, a laser theodolite 12 arranged in the working well in advance is used to monitor the laser receiving plate 13 arranged on the jacking machine head Ⅰ1 or the jacking machine head Ⅱ2; manual review is carried out every 10m of jacking; during manual verification, the positioning point 9 set in the working well is referred to, and the coordinates of the bull's eye 11 on the jacking machine head Ⅰ1 or the jacking machine head Ⅱ2 are verified by the total station arranged in the working well; the deviation of the jacking axis 10 is measured in real time, and correction is carried out according to the deviation to ensure that the horizontal error is ≤±50mm and the elevation error is ≤±25mm when the breakthrough occurs.

[0028] S2, when the pipe jacking machine head Ⅰ1 and the pipe jacking machine head Ⅱ2 are close and the hard rock formation on the construction path is not completely penetrated, the two pipe jacking machines are stopped for the first time, and the construction personnel enter to dismantle the cutter head assembly and internal structure of the pipe jacking machine head Ⅱ2. The disassembled parts are transported to the outside of the working well through the steel jacking pipe 3 on one side of the pipe jacking machine head Ⅱ2, and the outer shell of the pipe jacking machine head Ⅱ2 is retained as a connecting pipe; S3, after the cutter head assembly and internal structure of the pipe jacking machine head II 2 are disassembled and the construction personnel have withdrawn; Resume the advancement of the pipe jacking machine head Ⅰ1 to break the last section of rock mass 15 between the two pipe jacking machines. When the cutter head assembly of the pipe jacking machine head Ⅰ1 and the outer shell of the pipe jacking machine head Ⅱ2 are in contact and completely penetrated, the pipe jacking machine head Ⅰ1 is stopped for the second time; the cutter head assembly, internal structure and outer shell of the pipe jacking machine head Ⅰ1 are disassembled, and the disassembled parts are transported to the outside of the working well through the steel jacking pipe 3; Because it is a hard rock formation, after the internal structure and cutterhead assembly of the jacking head II 2 are removed, when breaking the last section of rock mass 15, the rock formation will not directly flow into the outer shell of the jacking head II 2.

[0029] When breaking the last section of rock mass 15 between the two pipe jacking machines, the excavation pressure and excavation speed of the pipe jacking machine head Ⅰ1 should be reduced. Since the internal structure of the pipe jacking machine head Ⅱ2 has been dismantled, the excavation pressure of the pipe jacking machine head Ⅰ1 should be strictly controlled to avoid excessive pressure causing the rock mass to fall into the pipe jacking machine head Ⅱ2 as a whole, affecting the construction progress; the excavation speed should be appropriately reduced during the excavation process, and the parameters of the pipe jacking operation table should be observed at all times. The machine should be stopped in time after the rock mass is broken to avoid damage to the outer shell of the pipe jacking machine head Ⅱ2.

[0030] S4, a trumpet-shaped bellows 29 is arranged at the position where the pipe jacking machine head Ⅰ1 stops for the second time, and two ends of the trumpet-shaped bellows 29 are respectively welded to the outer shell of the pipe jacking machine head Ⅱ2 and the steel jacking pipe 3 brought in by the pipe jacking machine head Ⅰ1; Specifically, the trumpet-shaped bellows 29 is pre-divided and processed into a number of small arc-shaped plates, and the arc-shaped plates are sent to the second stop position through the steel jacking pipe 3 and assembled into shape, and the end of the trumpet-shaped bellows 29 with a larger diameter is welded to the end of the outer shell of the jacking machine head II 2, and the end of the trumpet-shaped bellows 29 with a smaller diameter is welded to the steel jacking pipe 3 brought in by the jacking machine head I 1, so that the steel jacking pipes 3 brought in by the jacking machines on both sides are connected after being connected to the trumpet-shaped bellows 29 and the outer shell of the jacking machine head II 2; See also Figure 5 Specifically, the trumpet-shaped bellows 29 can be divided into a plurality of small pieces along its own circumferential dividing line and axial dividing line. When assembling the trumpet-shaped bellows 29, adjacent arc plates are connected by connecting bolts 31, and the arc plates and the outer shell of the steel jacking pipe 3 or the arc plates and the jacking machine head II 2 are connected by internal annular welding, and a waterproof rubber strip is provided at the connection seam 30. The small-piece splicing method of the trumpet-shaped bellows 29 is conducive to prefabrication in advance according to the deviation angle of the jacking machine head or the steel jacking pipe 3 axis, and the installation angle can be flexibly adjusted, and the trumpet-shaped bellows is lightweight and high in strength.

[0031] After the trumpet-shaped corrugated pipe 29 is welded, cement mortar is injected into the gap 5 between the pipe jacking head and the rear end steel pipe jacking through the grouting holes on the outer shell of the pipe jacking head II 2 to meet the structural strength and waterproof requirements.

[0032] During the construction of a hydraulic tunnel, it is necessary to make the tunnel and the steel jacking pipe have a certain slope. Therefore, there is an elevation difference between the starting wells designed at both ends, so that the starting well on the side of the jacking machine head Ⅱ2 is located on the side with a low elevation. When disassembling the jacking machine head Ⅰ1 and the jacking machine head Ⅱ2, the disassembled parts are transported to the working well on this side through the jacking machine head Ⅱ2 and the steel jacking pipe 3 brought in by the jacking machine head Ⅱ2 by using the slope, and then sent to the outside of the working well. This method can save transportation power when transporting parts. Retaining the last section of rock mass 15 can prevent water in the stratum from flowing into the jacking head II 2 at a lower elevation. Therefore, in the process of first dismantling the internal structure and cutterhead assembly of the jacking head II 2, grouting is simultaneously performed on the outside of the left jacking pipe to stop water, and then the last section of rock mass is broken to achieve penetration.

[0033] When only one end of the starting well is used to transport parts, the jacking machine head II 2 is disassembled first and then the jacking machine head I 1 on the other side is disassembled. This facilitates disassembly and does not cause accumulation of disassembled parts of the jacking machine head I 1. The disassembly efficiency is high and does not require excessive consumption of transportation equipment.

[0034] Before disassembling the internal structure of pipe jacking head Ⅰ1 and pipe jacking head Ⅱ2, all kinds of power pipelines should be disconnected first.

[0035] When disassembling the internal structure of the pipe jacking machine head Ⅰ1 and the pipe jacking machine head Ⅱ2, a lifting lug is welded inside the outer shell of the pipe jacking machine head Ⅰ1 and the pipe jacking machine head Ⅱ2 and a hand chain hoist is installed, and the disassembled and cut parts are removed by the hand chain hoist; When using a hand winch for lifting, the following matters should be noted: ① Before disassembling and lifting the internal components of the pipe jacking machine, check whether there are any connection points between the lifted components and the machine head body that have not been disconnected. Lifting can only be started after the bolts, locking pins and welding points are detached; ② The lifting weight should be ensured to be within the carrying capacity. When used at an angle or horizontally, the load should be reduced by half, and attention should be paid to adjusting the direction of the zipper so that the force direction is in line with the direction of the sprocket to prevent the hand zipper from being out of the groove or stuck. When used horizontally, a pad should be added at the zipper entrance to support the chain.

[0036] In the above embodiment, when disassembling the internal structure of the pipe jacking head I1 or the internal structure of the pipe jacking head II2, the following steps are performed in sequence: draining the water in the muddy water pipeline and disassembling the muddy water pipeline system, disassembling the deviation correction oil circuit system including the deviation correction jack 14, and disassembling the cutter head assembly drive system, which specifically includes the following steps: Step 1: Remove the slurry inlet pipe 24, the slurry discharge pipe 25 and the mud-water bypass valve 26. Before removal, drain all the water in the pipes to prevent the slurry from flowing into the pipe jacking head and affecting the removal of subsequent components. Step 2: Dismantle the correction oil pump station 21, the correction jack 14 and the oil pipe 22 respectively. When dismantling, first disconnect the oil pipe, return the oil in the oil pipe to the correction oil pump station 21, then remove the correction jack 14, and then dismantle the correction oil pump station 21; Step 3: Remove the drive motor 20 and the planetary reducer 18, and fix them on the lifting hole of the stiffening plate of the pipe jacking machine housing with a 2 t hand chain hoist. The drive motor 20 and the planetary reducer 18 need to be temporarily lifted before removal; remove the drive motor 20 and the planetary reducer 18 of the pipe jacking machine from top to bottom in sequence; Step 4: Remove the main drive gearbox 19. Two lifting ears are symmetrically set on the stiffening plate just above the main drive gearbox 19. After the lifting ears are welded, two 10t hand chain hoists are used to hang on the lifting ears of the stiffening plate of the pipe jacking machine shell. After tightening the gearbox with the hand chain hoist, remove the high-strength bolts connecting the main drive gearbox 19 and the chest plate 17 behind the cutter head. After all the connecting bolts are removed, slowly lift the main drive gearbox 19 onto the flatbed truck; Step 5: Remove the distribution box 23. Before removal, disconnect and remove all kinds of power pipelines connected to the machine head, and then use a hand winch to remove the distribution box of the pipe jacking machine.

[0037] Disassembling the cutter disc assembly includes cutting off the cutter disc 4, the cutter disc seat 16 and the chest plate 17 behind the cutter disc, and specifically includes the following construction methods: (1) When dismantling the cutter disc 4 and the cutter disc seat 16 of the pipe jacking machine head Ⅱ2, it is necessary to start dismantling from the inside of the pipe jacking machine head Ⅱ2. First, use a hand winch to cut off the cutter disc seat 16, and then cut off the cutter disc 4. The cut parts are transported to the outside of the tunnel through the internal tunnel of the right pipe jacking machine.

[0038] (2) When dismantling the cutter disc 4 and the cutter disc seat 16 of the pipe jacking machine head I, the operator dismantles the cutter disc 4 and the cutter disc seat 16 in the right side of the pipeline that has been penetrated, and uses a hand winch to cut off the cutter disc 4 and the cutter disc seat 16 of the pipe jacking machine. The cut cutter discs and other parts are transported to the outside of the tunnel one by one via a flatbed truck in the steel pipe jacking.

[0039] (3) After the cutting operation of the cutter disc 4 and the cutter disc seat 16 is completed, the cutter disc rear breast plate 17 is cut. Before cutting, the front and rear sides of the cutter disc rear breast plate 17 are fixed with steel member diagonal braces 27, and then the operator cuts the cutter disc rear breast plate 17 into blocks in the right pipe. The size of the cut block should be less than 30 cm. Use a hand chain hoist to place the cut block of the cutter disc rear breast plate 17 on a flatbed truck in the steel top pipe and transport it to the outside of the hole.

[0040] The parts not described in detail in the above embodiments are prior art.

[0041] It should be noted that although the present invention is described by the above embodiments, the present invention may also have other various embodiments. Without departing from the spirit and scope of the present invention, it is obvious that those skilled in the art may make various corresponding changes and deformations to the present invention, but these changes and deformations should all fall within the scope of protection of the appended claims of the present invention and their equivalents.

Claims

1. A two-way jacking docking and disassembly method for a pipe jacking machine suitable for hard rock formations, wherein pipe jacking machines are respectively arranged in working wells at both ends of a construction path of a hard rock formation, and a pipe jacking machine head I of one pipe jacking machine and a pipe jacking machine head II of another pipe jacking machine respectively bring in steel jacking pipes during the process of excavating in opposite directions; It is characterized in that The following steps are involved: S1. During the process of the jacking machine head I and the jacking machine head II excavating toward each other, the deviation of the jacking axes of the two is measured and corrected in real time; S2, when the pipe jacking machine head I and the pipe jacking machine head II are close to each other and the hard rock formation on the construction path is not completely penetrated, the two pipe jacking machines are stopped for the first time, the cutter head assembly and the internal structure of the pipe jacking machine head II are disassembled, and the outer shell of the pipe jacking machine head II is retained as a connecting pipe; S3, resuming the propulsion of the pipe jacking machine head I to break the last section of rock mass between the two pipe jacking machines, when the cutter head assembly of the pipe jacking machine head I and the outer shell of the pipe jacking machine head II are in contact and completely penetrated, the pipe jacking machine head I is stopped for the second time, and the cutter head assembly, internal structure and outer shell of the pipe jacking machine head I are disassembled; S4. A trumpet-shaped corrugated pipe is arranged at the position where the pipe jacking machine head I stops for the second time, and two ends of the trumpet-shaped corrugated pipe are respectively welded to the outer shell of the pipe jacking machine head II and the steel jacking pipe brought in by the pipe jacking machine head I.

2. A two-way jacking and docking and disassembly method for a pipe jacking machine suitable for hard rock formations according to claim 1, characterized in that: In S1, the jacking axis deviation is measured by real-time monitoring through a laser theodolite, and manual verification is performed periodically. After the measurement, a small angle and multi-frequency correction method is used to slowly correct the jacking machine head I and the jacking machine head II until the axis coincides before penetration; in: During real-time monitoring, a laser theodolite arranged in advance in the working well is used to monitor the laser receiving plate arranged on the pipe jacking machine head I or the pipe jacking machine head II; Manual review every 10m of advancement; During manual verification, a positioning point is set with reference to the working well, and the coordinates of the center of the target on the pipe jacking machine head I or the pipe jacking machine head II are verified using a total station arranged in the working well.

3. The method for bidirectional jacking and disassembly of a pipe jacking machine suitable for hard rock formations according to claim 1, characterized in that: When disassembling the internal structure of pipe jacking machine head I or the internal structure of pipe jacking machine head II, the following steps are followed: drain the water in the mud and water pipeline and disassemble the mud and water pipeline system, disassemble the correction oil system including the correction jack, and disassemble the cutter head assembly drive system.

4. A two-way jacking and docking and disassembly method for a pipe jacking machine suitable for hard rock formations according to claim 1, characterized in that: Disassembling the cutterhead assembly includes removing the cutterhead, the cutterhead seat, and the chest plate behind the cutterhead; Before disassembling the chest plate behind the cutter disc, the front and rear sides of the chest plate behind the cutter disc are fixed with steel diagonal braces, and then the construction workers cut it into pieces and transport it outside the working pit via a flatbed truck in the steel jacking pipe.

5. The method for bidirectional jacking and disassembly of a pipe jacking machine suitable for hard rock formations according to claim 1, characterized in that: In S3, when disassembling the cutter head assembly and the internal structure of the pipe jacking machine head I, the cutter head assembly and the internal structure are disassembled and cut off from both ends of the pipe jacking machine head I at the same time.

6. The method for bidirectional jacking and disassembly of a pipe jacking machine suitable for hard rock formations according to claim 1, characterized in that: When disassembling the internal structure of the pipe jacking machine head I and the pipe jacking machine head II, lifting ears are welded inside the outer shells of the pipe jacking machine head I and the pipe jacking machine head II and a hand chain hoist is installed, and the disassembled and cut parts are removed by the hand chain hoist.

7. The method for bidirectional jacking and disassembly of a pipe jacking machine suitable for hard rock formations according to claim 1, characterized in that: In S3, when breaking the last section of rock mass between the two pipe jacking machines, the excavation pressure and excavation speed of the pipe jacking machine head I are reduced.

8. The method for bidirectional jacking and disassembly of a pipe jacking machine suitable for hard rock formations according to claim 1, characterized in that: In S4, the trumpet-shaped corrugated pipe is pre-divided and processed into a number of small arc-shaped plates, and the arc-shaped plates are sent to the second shutdown position through the steel jacking pipe and assembled into shape. The end of the trumpet-shaped corrugated pipe with a larger diameter is welded to the end of the outer shell of the jacking machine head II, and the end of the trumpet-shaped corrugated pipe with a smaller diameter is welded to the steel jacking pipe brought in by the jacking machine head I, so that the steel jacking pipes brought in by the jacking machines on both sides are connected after being connected through the trumpet-shaped corrugated pipe and the outer shell of the jacking machine head II.

9. A two-way jacking and docking and disassembly method for a pipe jacking machine suitable for hard rock formations according to claim 8, characterized in that: When assembling the trumpet-shaped corrugated pipe, adjacent arc plates are connected by bolts, the arc plates and the steel jacking pipe or the arc plates and the outer shell of the jacking pipe head II are welded, and water-stopping strips are arranged at the connecting seams.

10. The method for bidirectional jacking and disassembly of a pipe jacking machine suitable for hard rock formations according to claim 1, characterized in that: After the trumpet-shaped corrugated pipe is welded, cement mortar is injected into the gap between the pipe jacking machine head II and the rear end steel pipe jacking through the grouting holes on the outer shell of the pipe jacking machine head II to meet the structural strength and waterproof requirements.

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