Shield tunneling machine main machine for original diameter reconstruction of existing tunnel

Abstract

The shield tunneling machine main machine comprises a shield body, the shield body sequentially comprises a front shield, a middle shield and a rear shield, each of the front shield and the middle shield is a double-layer shield shell and comprises a front shield inner shell, a middle shield inner shell and an outer shell, the front shield inner shell and the middle shield inner shell are connected in a tying mode, and the outer shell is connected with the middle shield inner shell in a tying mode. The outer shell is sleeved outside the bolting body of the front shield inner shell and the middle shield inner shell and is fixed with the bolting body; an existing tunnel slicing assembly is arranged in the front shield, and a reconstructed segment assembling assembly is arranged in the middle shield. The front end of the main machine of the shield tunneling machine is used for slicing segments of an existing tunnel, the rear end of the main machine of the shield tunneling machine is used for splicing reconstructed segments, and the main machine of the shield tunneling machine integrates modification and construction.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a shield machine main unit used for reconstruction of an existing tunnel with its original diameter. Background Art

[0002] With the sustained and rapid economic development of my country, traffic volume has increased dramatically. Given the advantages of shield tunneling, such as safety and speed, more and more tunnels are being constructed using the shield method. Over time, many older shield tunnels have gradually reached their designed service life. Common approaches to shield tunnels that have exceeded their designed service life include: 1. Building a new line. The disadvantage is that it cannot fully meet the needs of people passing through the existing tunnels; 2. Repairing the existing tunnel. The disadvantage is that it cannot guarantee the clearance required for operation; 3. Expanding the existing tunnel. The disadvantage is that the project is unlikely to be affected by the existing tunnel line; 4. Abandoning the existing tunnel. The disadvantage is that it not only cannot meet the needs of people passing through the existing tunnels and the safety requirements of the underground space, but also wastes underground space resources. In summary, the best solution is to ensure the operational function of the original line through reconstruction. During the construction process, how to eliminate the impact of the existing tunnel on the construction is the key to reconstructing the existing tunnel. Utility Model Content

[0003] The utility model aims to provide a shield machine main unit for rebuilding an existing tunnel to its original diameter, so as to solve the problem of influence of the existing tunnel line on the construction during the reconstruction of the existing tunnel.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A shield machine main unit for reconstruction of an existing tunnel to its original diameter comprises a shield body, the shield body comprising a front shield, a middle shield and a rear shield in sequence, the front shield and the middle shield both being double-layer shield shells, comprising a front shield inner shell, a middle shield inner shell and an outer shell, the front shield inner shell and the middle shield inner shell being bolted together, and the outer shell being disposed outside and fixed to the bolted body of the front shield inner shell and the middle shield inner shell;

[0006] The existing tunnel slicing component is arranged in the front shield, and the rebuilt segment assembling component is arranged in the middle shield.

[0007] Preferably, the existing tunnel slicing assembly includes a drill bit, a main drive unit and a cutting unit. The main drive unit is arranged in the middle of the front end of the front shield. The main drive unit is annular, and a cylinder is provided on the inner ring. A drill bit is installed at the power output end of the main drive unit, and the drill bit is arranged at the front end of the front shield. The drill bit is a cylindrical structure, and multiple first steel wire brushes are provided on the inner ring of the drill bit. The cutting unit is installed at the bottom of the drill bit cylinder.

[0008] Preferably, the front end of the drill bit is a toothed tool, the inner ring of the drill bit is adapted to the existing tunnel, and the existing tunnel is circular.

[0009] Preferably, the cutting unit includes a fixed arm, a telescopic arm, a tool holder and a cutting blade. The fixed arm is installed at the bottom of the drill barrel. The fixed arm is L-shaped. A telescopic arm is provided at one end of the fixed arm. A tool holder is rotatably provided at one end of the telescopic arm, and a cutting blade is rotatably provided on the tool holder.

[0010] The reconstruction segment assembly assembly includes a segment assembly machine, which is installed in the middle shield and extends into the rear shield. A plurality of second steel wire brushes are provided on the inner ring of the rear shield.

[0011] Preferably, a M-beam is provided on the rear end surface of the middle shield inner shell, and the segment assembly machine is installed at the rear end of the M-beam.

[0012] In this utility model, the front shield and the middle shield are both double-layer shield shells with modular design and prefabricated construction. Under the condition that the receiving and lifting reserved openings in the existing largest station are limited, the welding-free installation and cutting-free removal of the main machine components are realized to the maximum extent, the workload of cutting and restoring the partitions in the abandoned shield shell is reduced, the construction period is shortened, the construction cost is reduced, and the recycling degree of each component and the green construction level are improved.

[0013] The shield machine main body used for reconstruction of existing tunnels to their original diameter can seal and support the existing tunnel segments while excavating, and can also cut, dismantle and transport the existing tunnel segments. No manual operation is required throughout the process, and the process is simple, safe and reliable. It effectively solves the problem that existing tunnels cannot be used after reaching the end of their lifespan, avoids the waste of underground space resources of existing tunnel lines, and saves manpower and financial resources.

[0014] The shield machine main body is used for reconstruction of existing tunnels to their original diameter. The inner ring of the drill bit is adapted to the existing tunnel, and plays a role in supporting the existing tunnel segments during the reconstruction process. The wire brush set on the inner ring of the drill bit fits tightly with the outer surface of the existing tunnel, playing a sealing role.

[0015] The shield machine main body used for reconstruction of existing tunnels to their original diameter slices the pipe segments of the existing tunnel at the front end, and assembles the reconstruction pipe segments at the rear end. It is a shield machine that integrates reconstruction and construction. It effectively eliminates the impact of the existing tunnel line on the construction during the reconstruction of the existing tunnel to its original diameter, and no longer requires expansion excavation. Compared with the existing tunnel expansion technology, it eliminates the secondary drilling and expansion link of the tunnel, simplifies the construction steps, and shortens the construction period.

[0016] A cylinder is set inside the shield machine main body used for reconstruction of existing tunnels to their original diameters as a personnel passage, so that operators can observe the segment slicing operation of the existing tunnel in real time. It can also serve as a transportation passage for the existing tunnel segments after slicing. The transportation passage is not limited to transportation out of the cylinder, but can also be output along the existing tunnel that has not been demolished according to the actual construction conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a side view of the cutting unit of the utility model;

[0019] Figure 3 This is a diagram of the shield body of the shield machine of the utility model;

[0020] Figure 4 This is a front elevation view of the inner shell of the front shield of the present invention;

[0021] Figure 5 This is a block diagram of the inner shell of the middle shield of the utility model;

[0022] Figure 6 This is the front elevation view of the M-shaped beam of the utility model;

[0023] Figure 7 This is a front elevation view of the backing housing of the present utility model;

[0024] In the figure: 1. Shield body; 2. Existing tunnel slicing assembly; 3. Reconstructed segment assembly assembly; 4. Circulation system; 5. Existing tunnel; 10. Front shield; 11. Middle shield; 12. Rear shield; 13. Outer shell; 20. Drill bit; 21. Main drive unit; 22. Cutting unit; 23. Cylinder; 24. First wire brush; 30. Segment assembly machine; 31. Second wire brush; 40. Annular mud and water silo; 41. Slurry inlet hole; 42. Slurry outlet hole; 100. Front shield inner shell; 110. Middle shield inner shell; 111. M-beam; 220. Fixed arm; 221. Telescopic arm; 222. Tool holder; 223. Cutting blade. DETAILED DESCRIPTION

[0025] The present invention will be further described with reference to the following drawings:

[0026] like Figures 1 to 7 As shown, a shield machine main body for reconstruction of an existing tunnel with the original diameter includes a shield body 1, which includes a front shield 10, a middle shield 11 and a rear shield 12 in sequence. The existing tunnel slicing component 2 is arranged in the front shield 10, and the reconstruction segment assembly component 3 is arranged in the middle shield 11.

[0027] The existing tunnel slicing assembly 2 includes a drill bit 20, a main drive unit 21 and a cutting unit 22. The main drive unit 21 is arranged in the middle of the front end of the front shield 10. The main drive unit 21 is annular, and a cylinder 23 is arranged on the inner ring. The cylinder 23 can be used as a transportation channel after the existing tunnel 5 is cut, and can also be used as a passage for operators to pass so that the operators can grasp the specific situation of the cutting of the existing tunnel 5 in front in real time.

[0028] A drill bit 20 is mounted at the power output of the main drive unit 21 and positioned at the front end of the front shield 10. The drill bit 20 is cylindrical in structure, with multiple first wire brushes 24 positioned on its inner circumference. A cutting unit 22 is mounted at the bottom of the drill bit 20. The front end of the drill bit 20 is a toothed cutter, and the inner circumference of the drill bit 20 is adapted to the existing circular tunnel 5. During operation, the first wire brushes 24 provide a tight seal, ensuring a close fit with the outer surface of the existing tunnel.

[0029] The reconstruction segment assembly component 3 includes a segment assembly machine 30 , which is installed in the middle shield 11 and extends into the rear shield 12 . A plurality of second wire brushes 31 are provided on the inner circle of the rear shield 12 .

[0030] The front shield 10 and the middle shield 11 are both double-layer shield shells, including a front shield inner shell 100, a middle shield inner shell 110 and an outer shell 13. The front shield inner shell 100 and the middle shield inner shell 110 are bolted together, and the outer shell 13 is arranged outside the bolted body of the front shield inner shell 100 and the middle shield inner shell 110 and fixed to each other. The front shield inner shell 100, the middle shield inner shell 110, the outer shell 13 and the rear shield are assembled and connected by bolts.

[0031] A M-beam 111 is provided on the rear end surface of the middle shield inner shell 110 , and the segment assembly machine 30 is installed at the rear end of the M-beam 111 .

[0032] The cutting unit 22 includes a fixed arm 220, a telescopic arm 221, a tool holder 222 and a cutting blade 223. The fixed arm 220 is installed at the bottom of the drill bit 20. The fixed arm 220 is L-shaped. A telescopic arm 221 is provided at one end of the fixed arm 220. A tool holder 222 is rotatably provided at one end of the telescopic arm 221, and a cutting blade 223 is rotatably provided on the tool holder 222.

[0033] In this example, the cutting unit rotates along with the rotation of the drill bit. At this time, the tool holder is in a state perpendicular to the axis of the existing tunnel, thus realizing circular cutting of the existing tunnel. After the circular cutting is completed, the tool holder rotates around one end of the telescopic arm to be parallel to the axis of the existing tunnel. The telescopic action of the telescopic arm is used to cut the existing tunnel after the circular cutting. After cutting a line, the rotation of the drill bit drives the cutting unit to rotate a certain angle, and then the telescopic action of the telescopic arm is repeated to cut the next cutting line.

[0034] In one embodiment, a stepper motor is installed at the front end of the telescopic arm, and the tool holder is driven to rotate by the stepper motor. The angle of the tool holder is controlled by controlling the step angle of the stepper motor to achieve a change in the relative position relationship between the tool holder and the existing tunnel axis.

[0035] A method for using a shield machine main unit for reconstructing an existing tunnel to its original diameter comprises the following steps:

[0036] Step 1: Design the shield machine main unit for reconstruction of the existing tunnel 5 according to the segment size of the existing tunnel 5 to be reconstructed;

[0037] Step 2: The excavation mode of the shield machine main unit used for the reconstruction of the existing tunnel to its original diameter is determined to be the slurry balance mode;

[0038] Step 3: Manufacturing the shield machine main unit for reconstruction of existing tunnels to their original diameter;

[0039] Step 4: Conduct surveying and setting out in the existing working pit to determine the assembly position of the shield machine main unit for reconstruction of the existing tunnel to its original diameter;

[0040] Step 5: Install the initial water stop device in the existing working well;

[0041] Step 6: Hoist the shield machine main unit and supporting equipment for reconstruction of the existing tunnel to its original diameter in the existing starting working shaft;

[0042] Step 7: Commissioning and acceptance of the shield machine main unit for reconstruction of existing tunnels to their original diameter;

[0043] Step 8: The shield machine main unit for reconstruction of the existing tunnel to its original diameter begins excavation;

[0044] Step 9: As the shield machine main body for reconstruction of the existing tunnel advances, the first wire brush 24 moves forward closely along the existing tunnel 5;

[0045] Step 10: As the shield machine main body used for reconstruction of the existing tunnel with the original diameter advances, mud is transported to the front end of the drill bit 20 through the circulation system 4;

[0046] In this example, the circulation system 4 includes an annular mud and water bin 40, a slurry inlet hole 41 and a slurry outlet hole 42. The annular mud and water bin 40 is a bin structure formed between the drill bit 20 and the front end face of the front shield 10. The slurry inlet hole 41 is provided at the upper part of the annular mud and water bin 40, and the slurry outlet hole 42 is provided at the lower part of the annular mud and water bin 40.

[0047] Step 11: After the existing tunnel 5 passes through the last wire brush on the inner ring of the drill bit 20, the existing tunnel 5 is cut and removed by the cutting unit 22;

[0048] In this example, the shield machine main unit used for reconstruction of the existing tunnel to its original diameter excavates one ring along the existing tunnel 5, and the cutting unit 22 cuts the existing tunnel 5 once;

[0049] Specifically, circular cutting is performed first: an electric push rod or hydraulic rod pushes the rotating arm to press against the inner wall of the existing tunnel. The drill bit drives the rotating arm to rotate while a small motor drives the cutting blade to rotate, performing circular cutting on the existing tunnel.

[0050] Then, longitudinal cutting is carried out: first, the electric push rod or hydraulic rod retracts the rotating arm to move the cutting blade away from the inner wall of the existing tunnel. Then, the stepper motor drives the tool holder to rotate 90 degrees around the front end of the telescopic arm to make it parallel to the axis of the existing tunnel. Then, the electric push rod and hydraulic rod advance the rotating arm to make the cutting blade press against the inner wall of the existing tunnel. Then, the small motor drives the cutting blade to rotate, and then the electric push rod or hydraulic rod drives the telescopic arm to extend and retract to perform longitudinal cutting of the existing tunnel. The tool holder in the two states cooperates with the rotation of the cutting blade to cut the existing tunnel into pieces along the pipe segment. The demolished existing tunnel 5 is transported to the starting working shaft, hoisted out and transported to the waste dump.

[0051] Step 12: After the shield machine main unit used for reconstruction of the existing tunnel has excavated a segment position, the reconstruction segment assembly component 3 begins to install the new segment to construct a new tunnel;

[0052] Step 13: Repeat steps 9 to 12 until the drill bit 20 reaches the receiving working well;

[0053] Step 14: After the shield machine mainframe for reconstruction of the existing tunnel arrives at the receiving location, the front shield inner shell 100, the middle shield inner shell 110 and the M-shaped beam 111 are removed in sections in the tunnel using a non-destructive demolition method;

[0054] Step 15: After the shield machine main body for reconstruction of the existing tunnel is dismantled by discarding the outer shell 13, the components are hoisted out piece by piece and transported out of the construction site;

[0055] Step 16: Construct the portal ring beam and clean the tunnel;

[0056] Step 17: Carry out caulking and sealing of hand holes in the tunnel;

[0057] Step 18: Complete the construction of the proposed tunnel.

[0058] The above embodiments are merely some descriptions of the concept and implementation of the present invention, and are not intended to limit the present invention. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A shield machine main unit for reconstruction of an existing tunnel with an original diameter, comprising a shield body (1), wherein the shield body (1) sequentially comprises a front shield (10), a middle shield (11) and a rear shield (12), and is characterized in that: The front shield (10) and the middle shield (11) are both double-layer shield shells, including a front shield inner shell (100), a middle shield inner shell (110) and an outer shell (13); the front shield inner shell (100) and the middle shield inner shell (110) are bolted together, and the outer shell (13) is disposed outside the bolted body of the front shield inner shell (100) and the middle shield inner shell (110) and fixed to each other; An existing tunnel slicing component (2) is provided in the front shield (10), and a rebuilt segment assembly component (3) is provided in the middle shield (11).

2. The shield machine main unit for reconstruction of an existing tunnel according to claim 1 is characterized in that: The existing tunnel slicing assembly (2) comprises a drill bit (20), a main drive unit (21) and a cutting unit (22); the main drive unit (21) is arranged at the middle of the front end of the front shield (10); the main drive unit (21) is annular, and a cylinder (23) is arranged on the inner ring; the drill bit (20) is installed at the power output end of the main drive unit (21), and the drill bit (20) is arranged at the front end of the front shield (10); the drill bit (20) is a cylindrical structure, and a plurality of first steel wire brushes (24) are arranged on the inner ring of the drill bit (20); and the cutting unit (22) is installed at the bottom of the drill bit (20) cylinder.

3. The shield machine main unit for reconstruction of an existing tunnel according to claim 2 is characterized in that: The front end of the drill bit (20) is a toothed cutter, and the inner ring of the drill bit (20) is adapted to the existing tunnel (5), which is circular.

4. The shield machine main unit for reconstruction of an existing tunnel according to claim 2 is characterized in that: The cutting unit (22) comprises a fixed arm (220), a telescopic arm (221), a tool holder (222) and a cutting blade (223); the fixed arm (220) is mounted on the bottom of the drill bit (20); the fixed arm (220) is L-shaped; a telescopic arm (221) is provided at one end of the fixed arm (220); a tool holder (222) is rotatably provided at one end of the telescopic arm (221); and a cutting blade (223) is rotatably provided on the tool holder (222).

5. The shield machine main unit for reconstruction of an existing tunnel according to claim 1 is characterized in that: The rebuilt segment assembly component (3) includes a segment assembly machine (30), which is installed in the middle shield (11) and extends into the rear shield (12). A plurality of second steel wire brushes (31) are provided on the inner ring of the rear shield (12).

6. The shield machine main unit for reconstruction of an existing tunnel according to claim 5 is characterized in that: A M-beam (111) is provided on the rear end surface of the middle shield inner shell (110), and the segment assembly machine (30) is installed on the rear end of the M-beam (111).

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