Existing tunnel extension device

Abstract

The utility model discloses an existing tunnel extension device which comprises a shield body, a cutter head and a main driving unit, the main driving unit is arranged in the shield body, the cutter head is installed at one end of the shield body, the cutter head and the main driving unit are both of an annular structure, a second barrel is arranged at the inner ring of the main driving unit, a first barrel is arranged at the front end of the second barrel, and a second barrel is arranged at the rear end of the first barrel. The first cylinder body extends into the inner ring of the cutter head and is rotatably connected with the cutter head, and a plurality of steel wire brushes are arranged on the inner ring of the first cylinder body and the inner ring of the second cylinder body; a cutting unit used for cutting an existing tunnel lining layer is arranged at the rear end of the second barrel and comprises a fixed disc, a rotating disc, a rotating disc arm, a telescopic disc arm, a tool rest and a cutting piece, and the fixed disc is arranged on a beam shaped like a Chinese character'mi 'of the shield body. According to the existing tunnel extension device, the existing tunnel lining layer is sealed and supported while tunneling is conducted, the tunnel lining layer can be cut, manual operation is not needed in the whole process, and the process is simple, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to an existing tunnel expansion device. Background Art

[0002] With the sustained and rapid development of my country's economy, the traffic volume has increased dramatically. Many mountain tunnels that were built a long time ago are limited by the construction technology level and design standards at that time. They usually adopt a double-lane form with a small cross-section, which makes it difficult to expand the construction. Therefore, the traffic operation capacity cannot meet the growing traffic demand of modern times. It not only affects travel, but also poses a severe challenge to traffic operation management. In some areas with large traffic volume, these problems are becoming increasingly prominent. The most conventional and simple solution is to build a new double-track project. The new line needs to be re-planned, and the engineering geology and hydrogeology of the tunnel site need to be re-surveyed. In addition, the new project needs to be re-invested and the cost is expensive.

[0003] In recent years, technologies for expanding existing tunnels without wasting existing tunnel lines have been continuously proposed. Among them, the invention patent with application number 201910062034.6 proposes a tunnel expansion construction method without interrupting traffic, including the following steps: erecting a mobile protective frame in the existing tunnel, cutting the lining structure in the existing tunnel in blocks, expanding the existing tunnel, providing initial support for the expansion area, constructing the secondary lining of the expansion area, and excavating the bottom side of the expansion area. The mobile protective frame is moved to the next area to be expanded in the existing tunnel, and the above construction operations are repeated until the expansion and lining of the entire tunnel expansion area are completed, the mobile protective frame is removed, and the tunnel is reopened to traffic. The utility model can not only not affect the normal traffic operation in the tunnel and protect the safety of the running vehicles, but also ensure the construction progress, improve the construction efficiency, effectively reduce the project cost, and comprehensively improve the construction convenience, operation safety and operation quality of mountain tunnels. This method is to carry out expansion construction without interrupting traffic. It is necessary to set up a mobile protective frame in the tunnel. After the excavation is completed, the expansion area is initially supported, and the secondary lining of the expansion area is constructed with prefabricated lining. It can be seen that the expansion construction process is cumbersome and requires operators to work, and the safety of the operators cannot be fully guaranteed.

[0004] The invention patent with application number 202311310115.6 relates to a fast and safe construction method for the expansion of an existing tunnel, including: S1. Using a detection instrument to find out the position of the existing tunnel steel support in the lining; S2. Opening a number of pre-buried anchor rod drilling holes; S3. Pre-grouting and installing pre-buried anchor rods; S4. Slotting and cutting at the intersection of the existing tunnel steel support and the bottom plate to cut off the connection between the existing tunnel steel support and the inverted arch steel support; S5. Opening blasting holes; S6. Excavating the existing lining structure and expanding the surrounding rock; S7. Installing the support structure and spraying concrete; S8. Opening a bottom plate blasting hole; S9. Excavating the existing tunnel bottom plate; S10. Constructing the remaining structure of the expanded tunnel. The utility model can achieve the purpose of improving the stability of the surrounding rock during the expansion of the existing tunnel, reducing the vibration damage of blasting to the tunnel, and accelerating the expansion construction speed of the existing tunnel. This construction method also requires pre-embedded anchor rods, and the pre-embedded anchor rods will also affect the expansion construction of the tunnel. Therefore, not only is the process cumbersome, but the construction period is also long. Utility Model Content

[0005] The utility model aims to provide an existing tunnel expansion device to solve the problem of reconstruction and expansion of the existing tunnel.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A device for expanding an existing tunnel comprises a shield body, a cutter disc and a main drive unit, wherein the main drive unit is arranged in the shield body, and the cutter disc is installed at one end of the shield body, the cutter disc and the main drive unit are both annular structures, a second cylinder is arranged at the inner circle of the main drive unit, a first cylinder is arranged at the front end of the second cylinder, the first cylinder penetrates into the inner circle of the cutter disc and is rotatably connected to the cutter disc, a plurality of wire brushes are arranged on the inner circle of the first cylinder and the inner circle of the second cylinder; a cutting unit for cutting an existing tunnel lining layer is arranged at the rear end of the second cylinder, the cutting unit comprises a fixed disk, a rotating disk, a rotating disk arm, a telescopic disk arm, a tool holder and a cutting blade, the fixed disk is arranged on the M-beam of the shield body, a rotating disk is rotatably installed on the fixed disk, a rotating disk arm is telescopically arranged on the rotating disk, the rotating disk is L-shaped, a telescopic disk arm is arranged at one end of the rotating disk arm, a tool holder is rotatably arranged at one end of the telescopic disk arm, and a cutting blade is rotatably arranged on the tool holder.

[0008] Preferably, the first cylinder and the second cylinder have the same shape and size and are compatible with the existing tunnel.

[0009] Preferably, the existing tunnel is circular, rectangular or horseshoe-shaped.

[0010] Preferably, the cutter disc is in the shape of a circular ring, and is provided with soft soil formation cutters or composite soil formation cutters.

[0011] Preferably, the rotating disk is rotatably mounted on the fixed disk via a bearing and is driven to rotate by a reduction motor, and the rotating disk arm is connected to the rotating disk via an electric push rod or a hydraulic rod.

[0012] Preferably, the telescopic disc arm is an electric push rod or a hydraulic rod, a stepping motor is installed at one end of the telescopic disc arm, and a tool holder is installed at the output end of the stepping motor.

[0013] Preferably, the cutting blade is driven by a motor.

[0014] Preferably, during the reconstruction and expansion of the existing tunnel, the wire brush is in close contact with the outer surface of the existing tunnel.

[0015] In the utility model, the existing tunnel expansion device is used to renovate and expand the existing tunnel. The first cylinder and the second cylinder are adapted to the existing tunnel, and play a role in supporting the lining layer of the existing tunnel during the expansion process. The wire brushes arranged on the first cylinder and the second cylinder are tightly fitted with the outer surface of the existing tunnel to play a sealing role.

[0016] The existing tunnel expansion device can seal and support the existing tunnel lining while excavating, and can also cut the tunnel lining. The entire process does not require manual operation, the process is simple, safe and reliable, and effectively solves the problem that the existing tunnel cannot be used after reaching the end of its life or does not meet the use requirements. It also avoids the waste of existing tunnel lines and saves manpower and financial resources.

[0017] The tool holder is divided into two states: one is that the tool holder is perpendicular to the axis of the existing tunnel 8, and the other is that the tool holder is parallel to the axis of the existing tunnel. Specifically, the existing tunnel is firstly cut in a circular manner, and then cut longitudinally, and finally output by a feeder. The cutting process does not require operator participation, which is highly safe, and the existing tunnel is split into pieces for transportation, which is highly feasible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal section view of the overall structure of the utility model;

[0019] Figure 2 This is a front view of the cutter head of the utility model;

[0020] Figure 3 This is a schematic structural diagram of the main drive unit of the utility model;

[0021] Figure 4 This is a longitudinal section view of the main drive unit of the utility model;

[0022] Figure 5 This is a side view of the cutting unit of the utility model;

[0023] Figure 6 This is the front view of the cutting unit of the utility model;

[0024] In the figure: 1. shield; 2. cutter head; 3. main drive unit; 4. second cylinder; 5. first cylinder; 6. wire brush; 7. cutting unit; 8. existing tunnel; 9. circulation system; 10. M-beam; 71. fixed disk; 72. rotating disk; 73. rotating arm; 74. telescopic arm; 75. knife holder; 76. cutting disc. DETAILED DESCRIPTION

[0025] The utility model is further described in conjunction with the following drawings:

[0026] like Figure 1 to Figure 6 As shown, an existing tunnel expansion device includes a shield body 1, a cutter head 2 and a main drive unit 3. The main drive unit 3 is arranged in the shield body 1, and the cutter head 2 is installed at one end of the shield body 1. The cutter head 2 and the main drive unit 3 are both annular structures, and a soft soil formation cutter or a composite soil formation cutter is arranged on the cutter head 2.

[0027] A second cylinder 4 is provided at the inner ring of the main drive unit 3, and a first cylinder 5 is provided at the front end of the second cylinder 4. The first cylinder 5 penetrates into the inner ring of the cutter disc 2 and is rotatably connected to the cutter disc 2. The first cylinder 5 and the second cylinder 4 are consistent in shape and size and are adapted to the existing tunnel 8. The existing tunnel 8 includes a circular, rectangular or horseshoe shape. The existing tunnel 8 can be a tunnel using any construction method such as shield method, open excavation method, immersed tube method, dark excavation method, etc. The cutter disc 2 is rotatably connected to the first cylinder 5 through a bearing, wherein the inner ring of the bearing is welded to the first cylinder 5, and the cutter disc 2 is installed in cooperation with the outer ring of the bearing. Multiple wire brushes 6 are provided on the inner ring of the first cylinder 5 and the inner ring of the second cylinder 4. During the reconstruction and expansion of the existing tunnel 8, the wire brush 6 is tightly fitted to the outer surface of the existing tunnel 8, and the wire brush 6 has sealing properties.

[0028] In this example, the existing tunnel 8 is in the shape of a circular ring, the first sleeve 5 can be fixedly connected to the cutter head 2, and the second sleeve 4 is rotatably connected to the first sleeve 5.

[0029] A cutting unit 7 for cutting the lining layer of the existing tunnel 8 is arranged at the rear end of the second cylinder 4. The cutting unit 7 includes a fixed disk 71, a rotating disk 72, a rotating arm 73, a telescopic arm 74, a knife holder 75 and a cutting blade 76. The fixed disk 71 is arranged on the M-shaped beam 10 of the shield body 1. The rotating disk 72 is rotatably mounted on the fixed disk 71, and the rotating arm 73 is telescopically arranged on the rotating disk 72. The rotating arm 73 is L-shaped, and a telescopic arm 74 is arranged at one end of the rotating arm 73. A knife holder 75 is rotatably arranged at one end of the telescopic arm 74, and a cutting blade 76 is rotatably arranged on the knife holder 75.

[0030] In this example, the rotating disk 72 is rotatably mounted on the fixed disk 71 through a bearing and driven to rotate by a reduction motor. The rotating disk 72 can rotate 360 ​​degrees. The rotating arm 73 is connected to the rotating disk 72 through an electric push rod or a hydraulic rod. The telescopic arm 74 is an electric push rod or a hydraulic rod. The cutting blade 76 is driven by a motor. A stepper motor is installed at one end of the telescopic arm 74, and a tool holder 75 is installed at the output end of the stepper motor. The angle of the tool holder is controlled by controlling the step angle of the stepper motor. The tool holder 75 is divided into two states: one is that the tool holder 75 is perpendicular to the axis of the existing tunnel 8, and the other is that the tool holder 75 is parallel to the axis of the existing tunnel 8.

[0031] A method for using a shield machine main machine for reconstruction and expansion of an existing tunnel, comprising the following steps:

[0032] Step 1: designing a shield machine main unit for reconstruction and expansion of the existing tunnel according to the shape of the existing tunnel 8 to be reconstructed and expanded and the shape of the proposed tunnel;

[0033] Step 2: The tunneling mode of the shield machine is determined to be the mud-water balance mode;

[0034] Step 3: Manufacturing the shield machine mainframe for the reconstruction and expansion of the existing tunnel in the equipment manufacturing plant;

[0035] Step 4: Expand the existing working wells according to the size of the working wells at both ends of the existing tunnel 8 and the size of the proposed tunnel;

[0036] Step 5: After the expansion of the existing working shaft is completed and the shield machine for the existing tunnel expansion and reconstruction has passed the factory acceptance, it will be transported to the construction site;

[0037] Step 6: Conduct survey and layout in the existing working shaft to be expanded, and determine the assembly position of the shield machine mainframe for the expansion and reconstruction of the existing tunnel;

[0038] Step 7: Install the initial water stop device in the expanded existing working well;

[0039] Step 8: hoist the shield machine mainframe for the existing tunnel expansion and reconstruction in the existing starting working shaft under expansion;

[0040] Step 9: Commissioning and acceptance of the shield machine mainframe for the reconstruction and expansion of existing tunnels;

[0041] Step 10: Excavation of the existing tunnel using the shield machine main machine for reconstruction and expansion;

[0042] Step 11: As the shield machine main machine for the reconstruction and expansion of the existing tunnel advances, the wire brush 6 moves forward closely against the existing tunnel 8;

[0043] Step 12: The rock and soil mass cut by the cutter head 2 and the cutter is transported to the mud pool through the circulation system 9; the circulation system 9 includes an annular mud and water bin, a mud inlet hole and a mud outlet hole. The annular mud and water bin is a bin structure formed between the outer side of the first cylinder 5 and the shield shell of the shield body 1. The upper part of the annular mud and water bin is provided with a mud inlet hole, and the lower part of the annular mud and water bin is provided with a mud outlet hole, so that a mud and water balance mode is formed during the cutting process of the cutter head 2;

[0044] Step 13: After the existing tunnel 8 passes through the last wire brush 6 at the tail of the second cylinder 4, the existing tunnel 8 is cut and removed by the cutting unit 7. Specifically, the existing tunnel expansion shield machine main machine excavates the distance of one ring of the existing tunnel 8 once, and the cutting unit cuts the existing tunnel 8 once;

[0045] Specifically, the circular cutting is first performed: the electric push rod or hydraulic rod pushes the rotating arm 73 to press against the inner wall of the existing tunnel 8, the reduction motor drives the rotating disk 72 to rotate, and the small motor drives the cutting blade 76 to rotate, so as to perform circular cutting on the existing tunnel 8;

[0046] Then, longitudinal cutting is performed: first, the electric push rod or hydraulic rod retracts the rotating arm 73 to move the cutting blade 76 away from the inner wall of the existing tunnel 8, and then the stepper motor drives the tool holder 75 to rotate 90° around one end of the telescopic arm 74 to make it parallel to the axis of the existing tunnel 8, and then the electric push rod and hydraulic rod push the rotating arm 73 to make the cutting blade 76 press against the inner wall of the existing tunnel 8, and then the small motor drives the cutting blade 76 to rotate, and then the electric push rod or hydraulic rod drives the telescopic arm 74 to extend and retract to perform longitudinal cutting of the existing tunnel 8. The tool holder 75 in two states cooperates with the rotation of the cutting blade 76 to cut the existing tunnel 8 into pieces, which are finally output by the feed truck;

[0047] Step 14: Use battery cars to transport the dismantled existing tunnel 8 to the starting working pit, lift it out and transport it to the waste dump;

[0048] Step 15: Repeat steps 11 to 14 until the cutter head 2 reaches the receiving working well;

[0049] Step 16: Dismantle the shield machine mainframe for the existing tunnel reconstruction and expansion, hoist it out and transport it out of the construction site;

[0050] Step 17: Construct the portal ring beam and clean the tunnel;

[0051] Step 18: Carry out the work of caulking and sealing the hand holes in the tunnel;

[0052] Step 19: Complete the construction of the proposed tunnel.

[0053] The above embodiments are only some descriptions of the concept and implementation of the utility model, and are not intended to limit the concept and implementation of the utility model. Under the concept of the utility model, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. An existing tunnel expansion device, characterized in that: The invention comprises a shield body (1), a cutter disc (2) and a main drive unit (3), wherein the main drive unit (3) is arranged in the shield body (1), the cutter disc (2) is mounted at one end of the shield body (1), the cutter disc (2) and the main drive unit (3) are both annular structures, a second cylinder (4) is arranged at the inner ring of the main drive unit (3), a first cylinder (5) is arranged at the front end of the second cylinder (4), the first cylinder (5) penetrates into the inner ring of the cutter disc (2) and is rotatably connected to the cutter disc (2), a plurality of steel wire brushes (6) are arranged on the inner ring of the first cylinder (5) and the inner ring of the second cylinder (4); a steel wire brush (6) for cutting existing tunnels is arranged at the rear end of the second cylinder (4). A cutting unit (7) for cutting a lining layer of a road (8), the cutting unit (7) comprising a fixed disk (71), a rotating disk (72), a rotating arm (73), a telescopic arm (74), a tool holder (75) and a cutting blade (76), the fixed disk (71) being arranged on a M-shaped beam (10) of the shield body (1), the rotating disk (72) being rotatably mounted on the fixed disk (71), the rotating arm (73) being telescopically arranged on the rotating disk (72), the rotating arm (73) being L-shaped, the telescopic arm (74) being arranged at one end of the rotating arm (73), the tool holder (75) being rotatably arranged at one end of the telescopic arm (74), and the cutting blade (76) being rotatably arranged on the tool holder (75).

2. The existing tunnel expansion device according to claim 1, characterized in that: The first cylinder (5) and the second cylinder (4) have the same shape and size and are compatible with the existing tunnel (8).

3. The existing tunnel expansion device according to claim 2, characterized in that: The existing tunnel (8) includes a circular, rectangular or horseshoe shape.

4. The existing tunnel expansion device according to claim 1, characterized in that: The cutter disc (2) is in the shape of a circular ring, and a soft soil formation cutter or a composite soil formation cutter is arranged on the cutter disc (2).

5. The existing tunnel expansion device according to claim 1, characterized in that: The rotating disk (72) is rotatably mounted on the fixed disk (71) via a bearing and is driven to rotate by a reduction motor. The rotating arm (73) is connected to the rotating disk (72) via an electric push rod or a hydraulic rod.

6. The existing tunnel expansion device according to claim 1 or 5, characterized in that: The telescopic arm (74) is an electric push rod or a hydraulic rod. A stepping motor is installed at one end of the telescopic arm (74), and a tool holder (75) is installed at the output end of the stepping motor.

7. The existing tunnel expansion device according to claim 6, characterized in that: The cutting blade (76) is driven by a motor.

8. The existing tunnel expansion device according to claim 1 or 3, characterized in that: During the process of reconstruction and expansion of the existing tunnel (8), the wire brush (6) is in close contact with the outer surface of the existing tunnel (8).

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