Construction method of a retractable pipe jacking device

Abstract

The application relates to the technical field of pipe jacking equipment and construction of underground tunnel engineering, and provides a construction method of a retractable pipe jacking equipment, which comprises the following steps: s1, stratum reinforcement; s2, forming a clearance space: driving a driving member to drive a chest plate to retract, so that an artificial clearance operation space is formed between a cutter and an obstacle; s3, setting a transportation channel: any spliced sub-plate in the chest plate is detached from the chest plate, and the driving member is started again to drive the detached spliced sub-plate to further retract, so that the transportation channel is formed in the shell; s4, cleaning the obstacle; and s5, part resetting: the pipe jacking machine body returns to the normal working state. The application can facilitate the removal of underground obstacles, reduce construction cost and safety risk, and improve environmental benefits.

Description

Technical Field

[0001] This application relates to the technical field of pipe jacking equipment and construction in underground tunnel engineering, and in particular to a retractable pipe jacking equipment and its construction method. Background Technology

[0002] With the increasing demand for underground space development, mechanical rectangular pipe jacking technology has been widely applied in underground engineering projects such as underground municipal pedestrian crossings, subway entrances and exits, integrated utility tunnels, municipal vehicular tunnels, and short-section subway tunnels. However, based on current domestic pipe jacking equipment manufacturing technology and construction experience, mechanical pipe jacking equipment cannot yet perform normal jacking operations in conditions such as reinforced concrete structures, rock layers with high uniaxial compressive strength, slightly weathered rock layers, or isolated boulders. When the pipe jacking machine encounters obstacles during excavation, existing support structures or structures such as diaphragm walls, retaining piles, retaining walls, and underground culverts along the jacking route, or weathered rock layers and isolated boulders, must be removed.

[0003] Scenario 1: Reference Figure 7 When the jacking route of a rectangular pipe jacking project for a utility tunnel or vehicular tunnel needs to pass through an existing subway station, the existing subway station is supported by reinforced concrete diaphragm walls or bored piles, making it impossible for the rectangular pipe jacking machine to pass through the node normally. Construction must then be forced to change the original route and choose either a waste disposal site or another receiving method to complete the jacking. Existing solutions generally force the use of open-cut or other tunneling methods, which not only increases construction costs but also poses high safety risks. Open-cut construction inevitably requires ground traffic diversion and pipeline relocation, while tunneling methods cause significant disturbance to existing subway stations and also present disadvantages such as high safety risks and uncontrollable construction periods.

[0004] Scenario 2: Reference Figure 8 When the tunnel jacking route encounters a high embankment slope node such as an underpass of a highway, secondary modification of the embankment slope is required. This modification may necessitate the construction of multiple retaining wall support structures at both ends of the embankment slope, resulting in the initial retaining walls being covered by the jacking route. Existing pipe jacking equipment cannot remove the retaining wall structures located in the jacking route. The current solution, using box culvert jacking, not only presents high safety risks at the tunnel face but also requires a large area for the overall prefabrication of pipe sections, resulting in a large land area requirement that is not feasible under current construction conditions.

[0005] In summary, when encountering similar situations, if the rectangular pipe jacking method is adopted, it is only necessary to remove existing support structures or structures such as reinforced concrete diaphragm walls, retaining piles, retaining walls, and underground box culverts in the jacking route, or weathered rock layers and boulders. This can avoid the pipeline relocation, traffic diversion, and uncontrollable construction period caused by open-cut construction, as well as the high safety risks and high reinforcement costs of miners in underground excavation. It can also avoid the disadvantages of box culvert jacking method, such as large land area and high project cost. Therefore, it is urgent to develop a retractable pipe jacking equipment and its construction method to effectively solve the above problems. Summary of the Invention

[0006] To facilitate the removal of underground obstacles, reduce construction costs and safety risks, and improve environmental benefits, this application provides a retractable pipe jacking device and its construction method.

[0007] On the one hand, this application provides a retractable pipe jacking device, which adopts the following technical solution: A retractable pipe jacking device, comprising: The pipe jacking machine body includes a housing and a plurality of cutting tools, the cutting tools being located on the front side of the housing and being foldable into the housing; Multiple drive units are provided, each drive unit being configured in a one-to-one correspondence with the cutting tool, to drive the cutting tool to rotate; The breast plate is detachably connected to the front end of the outer shell, and includes splicing sub-plates corresponding to the blades one by one. Adjacent splicing sub-plates are detachably connected, and the blades and the drive unit are respectively disposed on both sides of the splicing sub-plates. A retraction device is provided for driving the breast plate to move backward when the breast plate is disassembled from the outer shell, and driving a portion of the splicing sub-plate to slide backward when the splicing sub-plate is disassembled.

[0008] By adopting the above technical solution, the cutting tools and drive unit are connected to the front of the outer shell via a breast plate. When an obstacle is encountered during the jacking process, the breast plate is detached from the outer shell, and a retraction device drives the breast plate, along with each cutting tool, to move backward. After retraction to a suitable distance, a manual obstacle removal work space is formed between the cutting tools and the obstacle. One splicing sub-plate inside the breast plate is then separated from the other splicing sub-plates. The retraction device drives the separated splicing sub-plate to continue retraction. As the splicing sub-plate retracts, the cutting tools and drive unit connected to it also retract along with it. When the splicing sub-plate retracts to a suitable position, personnel can pass through the breast plate along the outer shell to enter the manual obstacle removal work space to remove the obstacle. This method eliminates the need to change the original jacking route and cut-and-cover construction, reducing construction costs and improving construction safety.

[0009] Optionally, the cutting tool includes a main cutter head frame and a foldable cutting section rotatably mounted on the side wall of the main cutter head frame. The main cutter head frame is also provided with a reset member, which is used to drive the cutting tool to unfold. The front end face of the outer shell can abut against the foldable cutting section.

[0010] By adopting the above technical solution, the foldable cutter segment is rotatably mounted on the side wall of the main cutter head frame. When the foldable cutter segment rotates towards the center of the main cutter head frame, the cutter is in a folded state, and all folded cutters can slide together into the housing. When the foldable cutter segment rotates to be flush with the end face of the main cutter head frame, the cutter is in an unfolded state, capable of cutting soil. When the unfolded cutter gradually slides into the housing under the action of the retraction device, the front end face of the housing abuts against the foldable cutter segment, causing the foldable cutter segment to rotate under pressure back to the folded state. When the folded cutter slides out of the housing for reset, the foldable cutter segment moves outside the housing, and the reset component drives the foldable cutter segment to rotate, causing the cutter to return to the unfolded state.

[0011] Optionally, a mounting ring plate is fixed inside the outer shell, and the breast plate is detachably connected to the mounting ring plate.

[0012] By adopting the above technical solution, the breast plate is detachably connected to the outer shell through the installation ring plate.

[0013] Optionally, the retraction device includes a drive component, a connecting rod, and a traction bracket slidably disposed within the rear end of the housing. One end of the connecting rod is fixed to the traction bracket, and the other end is detachably connected to the splicing sub-plate. The drive component is used to drive the traction bracket to slide.

[0014] By adopting the above technical solution, when it is necessary to slide the tool into the housing, the driving component drives the traction bracket to slide away from the housing, and the connecting rod moves simultaneously with the traction bracket, thereby pulling the splicing sub-plate to move, so as to indirectly drive the tool set on the splicing sub-plate to slide into the housing.

[0015] Optionally, the housing is provided with a stiffening plate, and the driving member is telescopic. When the chest plate is retracted, the driving member abuts between the stiffening plate and the traction bracket.

[0016] By adopting the above technical solution, the driving component is set between the stiffening plate and the traction bracket. When it is necessary to drive the breast plate to retract, the driving component extends and drives the traction bracket to move away from the stiffening plate, so that the connecting rod pulls the splicing sub-plate to move towards the rear end of the shell.

[0017] Optionally, when advancing the breast plate, the drive member abuts between the rib plate and the breast plate.

[0018] By adopting the above technical solution, the driving component is set between the stiffening plate and the breast plate. When it is necessary to advance the breast plate, the driving component extends and pushes the breast plate to slide to the front end of the shell.

[0019] Optionally, the retraction device further includes a guide rail, a connecting seat, and a pulley disposed on one side of the connecting seat. The guide rail is fixed to the inner wall of the housing, the pulley is slidably disposed on the guide rail, and one side of the connecting seat is fixedly connected to the drive unit.

[0020] By adopting the above technical solution, the slide rail is slidably set inside the guide rail. When the retraction device pulls the splicing sub-plate to move, the cutter and drive unit set on the splicing sub-plate move together with the splicing sub-plate. The drive unit achieves a sliding connection with the inner wall of the outer shell through the connecting seat, which facilitates the retraction of the drive unit.

[0021] On the other hand, this application provides a construction method for a retractable pipe jacking device, which adopts the following technical solution: A construction method for a retractable pipe jacking device includes the following steps: s1. Ground reinforcement: When the pipe jacking machine encounters an obstacle while jacking along the jacking line, the cutting tool comes into contact with the obstacle, the pipe jacking machine stops and ground reinforcement treatment is carried out in the area in front of and behind the obstacle. s2. Create obstacle clearing space: Disconnect the connection between the breast plate and the outer shell, start the drive unit, and drive the breast plate to retract, causing the cutter to slide into the interior of the outer shell, so that a manual obstacle clearing operation space is formed between the cutter and the obstacle. s3. Set up a transport channel: Remove any splicing sub-plate inside the breast plate from the breast plate, and restart the drive unit to drive the removed splicing sub-plate to retract further. The cutters and drive units set on both sides of the splicing sub-plate retract together with the splicing sub-plate, so that a transport channel is formed inside the shell for personnel to enter and exit the manual obstacle removal operation space. s4. Clearing Obstacles: Use obstacle clearing equipment to remove obstacles, and transport the cleared debris along the transport channel to the launching shaft for hoisting out; s5. Component Reset: After clearing the obstruction, continue to start the drive unit to move the splicing sub-plate to align with and connect it to other splicing sub-plates to restore the breast plate; the drive unit drives the breast plate to slide back to its original position and continues to connect the breast plate to the shell, and the jacking machine body returns to normal working status.

[0022] By adopting the above technical solution, the breast plate is detached from the outer shell. A retraction device then retracts the breast plate, along with the cutting tools and drive unit, towards the rear of the outer shell, creating a manual obstacle removal work space for personnel to perform obstacle removal operations. A splicing sub-plate inside the breast plate is then disassembled. The retraction device continues to drive the disassembled splicing sub-plate, along with its drive unit and cutting tools, back to form a transport channel. Personnel can then enter the manual obstacle removal work space through this channel to carry out obstacle removal operations. After obstacle removal is completed, the breast plate is restored, allowing the cutting tools to move back to the front of the outer shell for normal tunneling work. This achieves the goal of clearing underground obstacles.

[0023] Optionally, step s2 further includes: after forming a space for manual obstacle removal, using the main jacking device in the starting well to push the pipe section and the outer shell forward until the outer shell abuts against the obstacle.

[0024] By adopting the above technical solution, after the manual obstacle removal operation space is formed, the outer shell is pushed in until the front edge of the outer shell is against the obstacle. This allows the manual obstacle removal operation space to form a protective layer under the support of the outer shell, thereby improving the safety of the workers during obstacle removal operations.

[0025] Optionally, step s4, "removing obstacles using obstacle removal equipment", includes: dividing the obstacle into multiple longitudinal obstacle removal areas along the horizontal direction, and dividing each longitudinal obstacle removal area into multiple obstacle removal sub-areas along the vertical direction; cleaning each longitudinal obstacle removal area from the outside to the inside, and cleaning each obstacle removal sub-area within the longitudinal obstacle removal area from top to bottom.

[0026] By adopting the above technical solution, the obstacles are divided into multiple clearing sub-areas, and the obstacles are cleared in batches and steps from the outside to the inside and from top to bottom to ensure the safety and stability of the excavation face.

[0027] In summary, this application includes at least one of the following beneficial effects: 1. The cutting tool of the pipe jacking machine body in this application can be folded, and the breast plate can be detachably connected to the outer shell. The breast plate is set as multiple detachably connected splicing sub-plates. The breast plate, together with the cutting tool and the drive unit, is driven to slide in the outer shell by the retraction device, so that a manual obstacle clearing operation space and transportation channel can be formed in the outer shell. This makes it easy for personnel to directly enter the front of the obstacle and clear the obstacle, reducing construction costs and safety risks. 2. In this application, the drive unit is slidably connected to the inner wall of the housing by setting guide rails, connecting seats and pulleys, which facilitates the retraction device to pull the splicing breast plate and the cutting tool and drive unit connected to the splicing breast plate; 3. In this application, when clearing obstacles, the obstacles are divided into multiple clearing sub-areas, and the obstacles are cleared in batches and steps from the outside to the inside and from top to bottom to ensure the safety and stability of the excavation face. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the pipe jacking machine body during retraction in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the breast plate structure of Embodiment 1 of this application; Figure 3 This is a front view structural diagram of the pipe jacking machine body according to Embodiment 1 of this application; Figure 4 This is a schematic diagram of the structure of the inner chest plate of the pipe jacking machine body during repositioning in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the structure of the pipe jacking machine body during retraction in Embodiment 2 of this application; Figure 6 This is a schematic diagram of the structure of the pipe jacking machine body during retraction in Embodiment 3 of this application; Figure 7 This is a structural diagram of scenario one in the related technologies; Figure 8 This is a structural diagram of scenario two in the related technology; Explanation of reference numerals in the attached drawings: 1. Pipe jacking machine body; 11. Outer shell; 111. Front shell; 112. Mounting ring plate; 113. Rear shell; 13. Rib plate; 2. Cutting tool; 21. Cutting head main frame; 22. Foldable cutting tool section; 3. Drive unit; 4. Breast plate; 41. Splicing sub-plate; 42. Connecting edge; 5. Retraction device; 51. Drive component; 511. Telescopic rod; 512. Cylinder; 52. Connecting rod; 53. Traction bracket; 54. Guide rail; 55. Connecting seat; 56. Pulley; 6. Spiral soil excavator; 7. Roller; 8. Pipe section. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] Example 1: Embodiment 1 of this application provides a retractable pipe jacking device.

[0031] refer to Figure 1 and Figure 2 A retractable pipe jacking device includes a pipe jacking machine body 1 and a retraction device 5. The pipe jacking machine body 1 includes a housing 11 and a tunneling mechanism. The housing 11 includes a front housing 111 and a rear housing 113 connected to each other. A mounting ring plate 112 is fixed on the side of the front housing 111 away from the rear housing 113, and the mounting ring plate 112 is located inside the front housing 111. A breast plate 4 is detachably connected to the mounting ring plate 112. In this embodiment, the detachable connection of the breast plate 4 to the mounting ring plate 112 is achieved by bolts. A spiral excavator 6 is also connected to the lower part of the mounting ring plate 112, and two spiral excavators 6 are arranged at intervals.

[0032] refer to Figure 2 The breast plate 4 includes multiple splicing sub-plates 41, and adjacent splicing sub-plates 41 are detachably connected. In this embodiment, the splicing sub-plates 41 are specifically rectangular plates, and there are six splicing sub-plates 41. A connecting edge 42 is fixed around the periphery of each splicing sub-plate 41, and the connecting edge 42 is specifically annular. The end faces of two adjacent connecting edges 42 are fitted together, and bolts are provided on the connecting edges 42. The bolts pass through the two fitted connecting edges 42 and are threaded with nuts to realize the connection between two adjacent splicing sub-plates 41.

[0033] refer to Figure 1 and Figure 3 The tunneling mechanism includes cutter 2 and drive unit 3. Cutter 2 is correspondingly arranged with splicing sub-plate 41; drive unit 3 is correspondingly arranged with cutter 2; cutter 2 and drive unit 3 are located on opposite sides of splicing sub-plate 41, with cutter 2 located outside the front housing 111. In this embodiment, drive unit 3 is connected to splicing sub-plate 41 via flange and bolts for easy disassembly. Cutter 2 includes cutterhead main frame 21 and foldable cutter segment 22 rotating on the outer wall of cutterhead main frame 21. A hinge shaft is fixed on cutterhead main frame 21, and foldable cutter segment 22 is rotatably connected to cutterhead main frame 21 via the hinge shaft. When foldable cutter segment 22 rotates to be coplanar with the end face of cutterhead main frame 21, cutter 2 is in an unfolded state; when foldable cutter segment 22 rotates towards the axis of cutterhead main frame 21, cutter 2 is in a folded state. A reset component is provided on the main frame 21 of the cutter head. Specifically, the reset component is a reset torsion spring, which is sleeved on the hinge shaft and is used to drive the foldable cutter section 22 to rotate so that the cutter 2 returns to the unfolded state.

[0034] refer to Figure 3 The main cutter head frame 21 is specifically designed as a disc, and four foldable cutter segments 22 are spaced apart around the axis of the main cutter head frame 21. The rotation axis of the foldable cutter segments 22 is perpendicular to the diameter of the main cutter head frame 21, and the output shaft of the drive unit 3 is coaxially fixed to the main cutter head frame 21. In this embodiment, two cutters 2 located in the same row are misaligned in the horizontal direction. When the cutter 2 located outside the front housing 111 moves towards the rear housing 113, the front end face of the front housing 111 can abut against the foldable cutter segment 22. The foldable cutter segment 22 gradually rotates under the pressure of the front end face of the front housing 111, causing the cutter 2 to be in a folded state.

[0035] refer to Figure 1 and Figure 2The retraction device 5 includes a drive component 51, a connecting rod 52, and a traction bracket 53. The traction bracket 53 is slidably disposed on the side of the rear housing 113 away from the front housing 111. One end of the connecting rod 52 is fixedly connected to the traction bracket 53, and the other end is detachably connected to the splicing sub-plate 41. The connecting rod 52 and the splicing sub-plate 41 are arranged in a one-to-one correspondence. In this embodiment, the connecting rod 52 is fixed to the splicing sub-plate 41 by bolts. A stiffening plate 13 is fixed on the side of the rear housing 113 near the front housing 111. The drive component 51 is specifically configured as a jack cylinder. The jack cylinder includes a cylinder body 512 and a telescopic rod 511 disposed at one end of the cylinder body 512. The jack cylinder abuts between the stiffening plate 13 and the traction bracket 53. One end of the cylinder body 512 abuts against the stiffening plate 13, and one end of the telescopic rod 511 abuts against the traction bracket 53. The hydraulic cylinder of the jack is activated to extend the telescopic rod 511, which drives the traction bracket 53 to move away from the stiffener 13. This causes the connecting rod 52 to pull the splicing sub-plate 41 closer to the rear housing 113. The drive unit 3 and the cutter 2, which are mounted on the splicing sub-plate 41, retract together with the splicing sub-plate 41.

[0036] In other embodiments, one end of the cylinder 512 can be detachably connected to the stiffening plate 13, and one end of the telescopic rod 511 can be detachably connected to the traction bracket 53.

[0037] The implementation principle of a retractable pipe jacking device according to an embodiment of this application is as follows: A starting shaft is excavated on the construction ground, and then the pipe jacking machine body 1 is hoisted into the starting shaft. A pipe section 8 is attached to the rear of the pipe jacking machine body 1, and a main jacking device is fixed on one side of the last pipe section 8 along the jacking direction of the pipe jacking machine body 1. During pipe jacking construction, the drive unit 3 drives the cutter 2 to rotate, and the main jacking device can push the pipe section 8 and the pipe jacking machine body 1 along the jacking direction by extending and retracting the hydraulic cylinder of the jack, thereby realizing the tunneling operation of the pipe jacking machine body 1. When the pipe jacking machine body 1 has completed one design stroke, the hydraulic cylinder of the main jacking device will retract, so that there is space between the main jacking device and the pipe section 8 in the starting shaft. After the subsequent pipe section 8 is installed to fill the space, the main jacking device extends again to advance the pipe section 8 and the pipe jacking machine body 1 forward one design stroke. This cycle is repeated until the tunneling operation of the pipe jacking machine body 1 is completed. The number of pipe sections 8 is determined according to the specific jacking construction length.

[0038] When an obstacle is encountered during excavation, the breast plate 4 is removed from the mounting ring plate 112. The hydraulic jack cylinder extends and retracts, driving the traction bracket 53 to slide away from the front housing 111. Driven by the traction bracket 53, the connecting rod 52 pulls the breast plate 4 back to the middle or rear end of the front housing 111, causing the cutter 2 to rotate to a folded state and slide into the outer shell 11, creating a manual obstacle removal work space between the cutter 2 and the obstacle. A splicing sub-plate 41 located on the lower half of the breast plate 4 is removed from inside the breast plate 4. The connection between one end of the connecting rod 52 and the splicing sub-plate 41 that has not been removed from the breast plate 4 is broken. The hydraulic jack cylinder is extended again to drive the removed splicing sub-plate 41 to further retract into the rear housing 113, creating a transport channel within the outer shell 11 for personnel to enter and exit the manual obstacle removal work space. Personnel enter the manual obstacle removal work space through the passage formed by the connection of pipe sections 8 after entering the starting shaft, and then proceed with the obstacle removal work.

[0039] After clearing the obstruction, disconnect all connections between the connecting rods 52 and the breast plate 4. Move the jack cylinder between the stiffening plate 13 and the disassembled splice plate 41, push the disassembled splice plate 41 to be flush with the other splice plates 41, and reconnect the disassembled splice plate 41 back into the breast plate 4. Then extend the jack cylinder again, pushing the breast plate 4 forward to the mounting ring plate 112, and reconnect the breast plate 4 to the mounting ring plate 112 with bolts. At this time, the cutter 2 is located on the front side of the outer casing 11 and is in the deployed state. That is, the pipe jacking machine body 1 returns to normal working state and can carry out normal tunneling work. During the process of pushing the breast plate 4, if the stroke of the jack cylinder is insufficient, a jacking iron can be added between the stiffening plate 13 and the fixed end of the cylinder for transitional force transmission.

[0040] Example 2: refer to Figure 6 The difference between Embodiment 2 and Embodiment 1 is that in this embodiment, the retraction device 5 further includes corresponding guide rails 54 and connecting seats 55. One end of the connecting seat 55 is rotatably connected to a pulley 56, which slides within the guide rail 54. The guide rails 54 are correspondingly arranged with the breast plate 4 and are fixed to the inner wall of the outer shell 11. The guide rails 54 are arranged horizontally. The end of the connecting seat 55 away from the pulley 56 is connected to the drive unit 3. The drive unit 3 achieves a sliding connection with the inner wall of the outer shell 11 through the guide rails 54, connecting seats 55, and pulleys 56, facilitating the sliding of the drive unit 3, splicing sub-plate 41, and cutter 2 within the outer shell 11.

[0041] Example 3: refer to Figure 7The difference between Embodiment 3 and Embodiment 1 is that in this embodiment, a roller 7 is rotatably connected to the bottom of the traction bracket 53. When the retraction device 5 drives the breast plate 4, the cutter 2, and the drive unit 3 to retract, the jack cylinder extends and pushes the traction bracket 53 to slide away from the front housing 111. The roller 7 reduces the sliding resistance experienced by the traction bracket 53, facilitating the retraction of the drive unit 3 by connecting the splicing sub-plate 41 and the cutter 2.

[0042] Example 4: 0043 This application also provides a construction method for a retractable pipe jacking device.

[0043] Construction using the retractable pipe jacking equipment described in Example 1, Example 2, or Example 3 includes the following steps: s1. Ground reinforcement: When the pipe jacking machine body 1 encounters an obstacle while jacking along the jacking line, the cutting tool 2 comes into contact with the obstacle; the pipe jacking machine body 1 stops and ground reinforcement treatment is carried out in the area in front of and behind the obstacle to ensure that the area in front of and behind the obstacle is in a waterless environment during the obstacle clearing operation.

[0044] Before proceeding to step s1, the main body 1 of the pipe jacking machine needs to be hoisted into the starting shaft and installed using hoisting equipment. Then, several pipe sections 8 are attached to the rear of the main body 1 of the pipe jacking machine, and the main jacking device is fixed on one side of the last pipe section 8, so that the main body 1 of the pipe jacking machine can carry out normal tunneling work.

[0045] s2. Forming a clearing space: Disconnect the connection between the breast plate 4 and the outer shell 11, start the drive unit 51, and drive the breast plate 4 back, causing the cutter 2 to slide into the interior of the outer shell 11, so that a manual clearing operation space is formed between the cutter 2 and the obstacle; after the manual clearing operation space is formed, use the main jacking device in the starting well to push the pipe section 8 forward along with the outer shell 11 until the outer shell 11 abuts against the obstacle.

[0046] Step s2 is initiated after an obstacle is encountered during tunneling, and the retraction device 5 is then installed at the rear end of the outer shell 11. At this time, the retraction device 5 is located within the stiffening plate 13 and the pipe section 8 located near the outer shell 11. During the process of creating a manual obstacle removal work space, the retraction distance of the breast plate 4 ranges from 0.5 to 1.0 meters. s3. Set up a transport channel: After waterproofing the exterior of the manual obstacle removal work space, install the guide rail 54 on the inner wall of the outer shell 11; remove any splicing sub-plate 41 inside the breast plate 4 from the breast plate 4, and start the drive unit 51 again to drive the removed splicing sub-plate 41 to retract further. The cutter 2 and drive unit 3 set on the splicing sub-plate 41 retract together with the splicing sub-plate 41, so that a transport channel for personnel to enter and exit the manual obstacle removal work space is formed inside the outer shell 11.

[0047] s4. Clearing obstacles: Use obstacle clearing equipment to remove obstacles. Use pneumatic picks or other obstacle clearing equipment to remove reinforced concrete structures, weathered rocks or boulders in a phased and orderly manner. Use a cutting machine to cut the reinforcing bars. Transport the cleared debris along the transport channel to the starting well and hoist it out.

[0048] When clearing obstacles, the obstacles are divided into multiple vertical clearing zones horizontally, and each vertical clearing zone is further divided into multiple sub-clearing zones vertically. Each vertical clearing zone is cleared sequentially from the outside in, and each sub-clearing zone within a vertical clearing zone is cleared from top to bottom. Taking a diaphragm wall with a height of 6 meters, a width of 10.2 meters, and a thickness of 1 meter as an example, the vertical division is done in 3-meter increments, the width in 3-3.5-meter increments, and the thickness in 0.3-0.35-meter increments, forming a six-square grid-like distribution. This is done in batches and steps to ensure the safety and stability of the excavation face. To ensure the safety of the clearing operation when clearing upper-level obstacles, temporary support platforms can be erected as needed.

[0049] s5. Component Reset: After clearing the obstruction, continue to start the drive unit 51, drive the splicing sub-plate 41 to move to align with other splicing sub-plates 41 and connect it to other splicing sub-plates 41 to restore the breast plate 4; drive the drive unit 51 to drive the breast plate 4 to slide to its original position and continue to connect the breast plate 4 to the shell 11. The pipe jacking machine body 1 returns to normal working state and continues to tunnel along the jacking route.

[0050] The specific operation for restoring the breast plate 4 is as follows: The hydraulic jack cylinder is moved between the stiffening plate 13 and the disassembled splice sub-plate 41, so that the disassembled splice sub-plate 41 is aligned with the other splice sub-plates 41, and then reconnected to the breast plate 4. The hydraulic jack cylinder is then extended again, pushing the breast plate 4 forward to the mounting ring plate 112, where it is reconnected to the mounting ring plate 112 using bolts.

[0051] s6. When encountering a reinforced concrete diaphragm wall again during excavation, repeat steps S2 to S5 until the entire pipe jacking project is completed.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction method for a retractable pipe jacking device, characterized in that, The equipment includes a retractable pipe jacking device, which comprises: The main body (1) of the pipe jacking machine includes a shell (11) and a plurality of cutters (2), the cutters (2) being located on the front side of the shell (11) and being foldable into the shell (11); Multiple drive units (3) are provided, each drive unit (3) is configured in a one-to-one correspondence with the cutter (2), and drive the cutter (2) to rotate; The chest plate (4) is detachably connected to the front end of the outer shell (11), and includes a splicing sub-plate (41) corresponding to the cutter (2) one by one. Adjacent splicing sub-plates (41) are detachably connected. The cutter (2) and the drive unit (3) are respectively disposed on both sides of the splicing sub-plate (41). The retraction device (5) is used to drive the breast plate (4) to move backward when the breast plate (4) is disassembled from the outer shell (11), and to drive part of the splicing sub-plate (41) to slide backward when the splicing sub-plate (41) is disassembled. It also includes the following steps: s1, Ground reinforcement: When the jacking machine body (1) encounters an obstacle while jacking along the jacking line, the cutting tool (2) comes into contact with the obstacle, the jacking machine body (1) stops and ground reinforcement treatment is carried out in the area in front of and behind the obstacle. s2. Forming a clearing space: Disconnect the connection between the breast plate (4) and the outer shell (11), start the drive unit (51), so that the drive unit (51) drives the breast plate (4) to retract, and drives the cutter (2) to slide into the interior of the outer shell (11), so that the cutter (2) and the obstacle form a manual clearing operation space. s3. Set up a transport channel: Remove any splicing sub-plate (41) inside the breast plate (4) from the breast plate (4), and restart the drive unit (51) to drive the removed splicing sub-plate (41) to retract further. The cutter (2) and drive unit (3) set on both sides of the splicing sub-plate (41) retract together with the splicing sub-plate (41), so that a transport channel is formed inside the shell (11) for personnel to enter and exit the manual obstacle removal operation space. s4. Clearing Obstacles: Use obstacle clearing equipment to remove obstacles, and transport the cleared debris along the transport channel to the launching shaft for hoisting out; s5. Component reset: After clearing the obstruction, continue to start the drive unit (51) to drive the splicing sub-plate (41) to move to align with other splicing sub-plates (41) and connect to other splicing sub-plates (41) to restore the breast plate (4); the drive unit (51) drives the breast plate (4) to slide to its original position and continue to connect the breast plate (4) to the shell (11), and the jacking machine body (1) returns to normal working status.

2. The construction method of a retractable pipe jacking device according to claim 1, characterized in that, The cutting tool (2) includes a main cutter head frame (21) and a foldable cutting section (22) rotatably mounted on the side wall of the main cutter head frame (21). A reset member is also provided on the main cutter head frame (21), which is used to drive the cutting tool (2) to unfold. The front end face of the outer shell (11) can abut against the foldable cutting section (22).

3. The construction method of a retractable pipe jacking device according to claim 1, characterized in that, An mounting ring plate (112) is fixed inside the outer shell (11), and the breast plate (4) is detachably connected to the mounting ring plate (112).

4. The construction method of a retractable pipe jacking device according to claim 1, characterized in that, The retraction device (5) includes a drive component (51), a connecting rod (52), and a traction bracket (53) slidably disposed in the rear end of the housing (11). One end of the connecting rod (52) is fixed to the traction bracket (53), and the other end is detachably connected to the splicing sub-plate (41). The drive component (51) is used to drive the traction bracket (53) to slide.

5. The construction method of a retractable pipe jacking device according to claim 4, characterized in that, The outer shell (11) is provided with a stiffening plate (13), and the driving member (51) is capable of telescopic movement; when the chest plate (4) is retracted, the driving member (51) abuts between the stiffening plate (13) and the traction bracket (53).

6. The construction method of a retractable pipe jacking device according to claim 5, characterized in that, When the breast plate (4) is advanced, the drive member (51) abuts between the rib plate (13) and the breast plate (4).

7. The construction method of a retractable pipe jacking device according to claim 1, characterized in that, The retraction device (5) further includes a guide rail (54), a connecting seat (55), and a pulley (56) disposed on one side of the connecting seat (55). The guide rail (54) is fixed to the inner wall of the outer shell (11), and the pulley (56) is slidably disposed on the guide rail (54). One side of the connecting seat (55) is fixedly connected to the drive unit (3).

8. The construction method of a retractable pipe jacking device according to claim 1, characterized in that, Step s2 also includes: after forming the artificial obstacle clearing operation space, using the main jacking device in the starting well to push the pipe section (8) and the outer shell (11) forward until the outer shell (11) comes into contact with the obstacle.

9. The construction method of a retractable pipe jacking device according to claim 1, characterized in that, Step s4, "removing obstacles using obstacle removal equipment", includes: dividing the obstacle into multiple longitudinal obstacle removal areas along the horizontal direction, and dividing each longitudinal obstacle removal area into multiple obstacle removal sub-areas along the vertical direction; cleaning each longitudinal obstacle removal area from the outside to the inside, and cleaning each obstacle removal sub-area within the longitudinal obstacle removal area from top to bottom.

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