Variable configuration shield assembly method

Abstract

This invention belongs to the field of tunnel boring machine (TBM) technology, specifically relating to a variable-model TBM assembly method. The method includes the following steps: S1. When the TBM is used as an earth pressure balance (EPB) TBM, the front shield flange is connected to the middle shield, the sealing door on stiffener plate one is closed, and a sealed chamber is formed between stiffener plate one, the face plate, and the front shield partition; a screw conveyor is installed on the screw conveyor base for transporting excavated soil; S2. If the EPB TBM is to be converted to a slurry balance TBM, the screw conveyor is first removed, and a slurry partition is installed between the front shield flange and the middle shield. At this time, the sealing door on stiffener plate one is opened, and a sealed cavity is formed between stiffener plate three, the slurry partition, and the front shield partition, serving as an air cushion chamber for the slurry shield; a slurry discharge pipe base is installed on the screw conveyor base and connected to a slurry pipeline for slurry discharge. This invention allows for convenient conversion between EPB and slurry balance TBMs without the need for a newly manufactured front shield.

Description

Technical Field

[0001] This invention belongs to the field of tunnel boring machine technology, specifically relating to a method for assembling a shield body with a variable model. Background Technology

[0002] The shield is a key structural component of a tunnel boring machine (TBM). TBMs can be categorized into earth pressure balance TBMs, slurry balance TBMs, TBMs (tunnel boring machines) for hard rock, and slurry-earth pressure balance dual-mode TBMs, among others. With the national promotion of the engineering machinery remanufacturing industry, the remanufacturing of TBMs is receiving increasing attention. TBM remanufacturing is characterized by high value, large size, complex structure, and a friendly working environment, making its social and economic benefits particularly significant.

[0003] When an earth pressure balance shield machine is remanufactured into a slurry balance shield machine of the same specifications, or vice versa, the front shield needs to be newly manufactured due to the difference in structural form. This is characterized by high cost, long construction period, and failure to meet the requirements of green manufacturing. Therefore, it is necessary to design a shield assembly method that can realize both earth pressure balance and slurry balance modes. Summary of the Invention

[0004] The purpose of this invention is to provide a method for assembling a variable-model shield to solve the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for assembling a variable-type shield body, the shield body comprising a front shield, a middle shield, and a tail shield connected in sequence; the front shield includes a front shield shell and its internal components: a front shield bulkhead, a front shield flange, a central ring, a first ring plate, a second ring plate, a third ring plate, a panel, a first connecting plate, a second connecting plate, and a screw conveyor base; the central ring is located at the center of the front shield and is used to install the main drive of the tunnel boring machine; the outer side of the central ring is connected to the inner wall of the front shield via the front shield bulkhead, the front shield bulkhead being arranged radially along the front shield; the front shield flange is used to connect the front shield and the middle shield; the inner side of the front shield flange is provided with a panel, the central ring is connected to the panel, the first connecting plate, and the second connecting plate via the first ring plate, the second ring plate, and the third ring plate, whose inner diameters increase sequentially; the first connecting plate and the second connecting plate are used to connect the front shield flange and the third ring plate at different positions, and the first connecting plate is provided with a second stiffener, the second connecting plate is provided with a third stiffener, and two first stiffeners are welded between the panel and the front shield bulkhead on both sides; a sealing door is installed on the first stiffener;

[0007] It also includes a mud and water baffle; the method includes the following steps:

[0008] S1. When the tunnel boring machine is used as an earth pressure balance tunnel boring machine, the front shield flange is connected to the middle shield, the sealing door on the first stiffening plate is in a closed state, and a sealed chamber is formed between the first stiffening plate, the panel, and the front shield partition; a screw conveyor is installed on the screw conveyor base for transporting excavated soil.

[0009] S2. If the earth pressure balance shield machine is to be converted into a slurry balance shield machine, the screw conveyor is first removed and the slurry baffle is installed between the front shield flange and the middle shield. At this time, the sealing door on the first stiffener plate is opened, and a sealed cavity is formed between the third stiffener plate, the slurry baffle, and the front shield baffle to be used as an air cushion chamber for the slurry shield. The slurry discharge pipe seat is installed on the screw conveyor seat and connected to the slurry pipeline for slurry discharge.

[0010] As a preferred technical solution, in earth pressure mode, the front shield flange and the middle shield are connected by bolts, gaskets and nuts.

[0011] As a preferred technical solution, after the front shield flange, connecting plate two, and ring plate three are connected as a whole, a first sealing groove that is interconnected is opened on these three components. An O-ring sealing strip is provided in the first sealing groove. The O-ring sealing strip is placed between the front shield flange and the mud and water partition to play a sealing role.

[0012] As a preferred technical solution, a second sealing groove is provided on both the mud and water baffle and the front shield flange. An O-ring seal is provided in the second sealing groove. The O-ring seal is installed between the front shield flange and the middle shield or between the mud and water baffle and the middle shield to achieve a sealing effect.

[0013] As a preferred technical solution, the pad is equipped with an O-ring sealing strip.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention forms a sealed chamber in earth pressure balance (EPB) tunneling mode by setting up a first stiffening plate, a panel, and a front shield partition, and forms an air cushion chamber in slurry mode by setting up a third stiffening plate, a front shield partition, and a slurry partition. In slurry mode, the slurry partition is bolted between the front shield flange and the middle shield. In EPB mode, the slurry partition is removed, and the front shield flange is bolted to the middle shield. Compared with existing technologies, the variable-type shield structure allows for easy conversion between EPB and slurry balance tunneling machines without the need for a new front shield, saving manufacturing costs and significantly shortening the project duration. This aligns with green manufacturing principles and solves problems such as high front shield manufacturing costs and long processing cycles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the installation of the variable-type shield structure in earth pressure mode in this invention;

[0017] Figure 2This is a schematic diagram of the installation of the variable-type shield structure in the mud-water mode of this invention;

[0018] Figure 3 This is a schematic diagram of the front shield structure of the variable-model shield body structure in this invention;

[0019] Figure 4 This is a schematic diagram of the front shield cross-section of the variable-mode shield structure in this invention;

[0020] Figure 5 This is a schematic diagram of the connection between the front shield and the middle shield in the earth pressure mode of the variable-type shield structure in this invention;

[0021] Figure 6 This is a schematic diagram showing the connection between the front shield, mud-water baffle, and middle shield in the mud-water mode of the variable-type shield structure of this invention.

[0022] Figure 7 This is a diagram showing the arrangement of the first sealing groove and the O-ring seal on the front shield flange, the connecting plate, and the ring plate.

[0023] Figure 8 This is a schematic diagram of the structure of the stiffener plate one in this invention.

[0024] 1. Front shield; 2. Middle shield; 3. O-ring seal one; 4. Front shield flange; 5. Panel; 6. Center ring; 7. Ring plate one; 8. Ring plate two; 9. Ring plate three; 10. Rib plate one; 11. Rib plate two; 12. Rib plate three; 13. Connecting plate one; 14. Connecting plate two; 15. First sealing groove; 16. O-ring seal two; 17. Connecting bolt one; 18. Gasket; 19. O-ring seal three; 20. Nut; 21. Mud baffle; 22. Connecting bolt two; 23. Screw conveyor seat; 24. Screw conveyor; 25. Slurry pipe seat; 26. Mud pipeline; 27. Sealing door; 28. Connecting bolt three; 29. ​​Front shield baffle; 30. Front shield shell. Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] like Figures 1 to 8As shown, a method for assembling a variable-mode shield body is described. The shield body includes a front shield 1, a middle shield 2, and a tail shield connected in sequence. The front shield includes a front shield shell 30 and its internal components, including a front shield partition 29, a front shield flange 4, a central ring 6, a first ring plate 7, a second ring plate 8, a third ring plate 9, a panel 5, a first connecting plate 13, a second connecting plate 14, and a screw conveyor base 23. The central ring 6 is located at the center of the front shield 1 and is used to install the main drive of the tunnel boring machine. The outer side of the central ring is connected to the inner wall of the front shield through the front shield partition 29, which is arranged radially along the front shield. The front shield flange 4 is used to connect the front shield 1 and the middle shield 2; the inner side of the front shield flange 4 is provided with a panel 5, and the central ring 6 is connected to the panel 5, connecting plate 13, and connecting plate 2 14 by ring plates 7, 8, and 9 with increasing inner diameters; the connecting plate 13 and connecting plate 2 14 are used to connect the front shield flange 4 and ring plate 3 9 at different positions, and the connecting plate 13 is provided with a stiffening plate 2 11, and the connecting plate 2 14 is provided with a stiffening plate 3 12. Two stiffening plates 10 are welded between the two sides of the panel 5 and the front shield partition 29; Figure 8 As shown, a sealing door 27 is installed on the stiffening plate 10.

[0027] The front shield is equipped with a screw conveyor seat 23. In earth pressure mode, a screw conveyor 24 is installed on the screw conveyor seat 23; in slurry mode, a slurry discharge pipe seat 25 is installed on the screw conveyor seat 23 and connected to the slurry pipeline 26.

[0028] It also includes a mud-water baffle 21, an O-ring seal 3, and an O-ring seal 16. In mud-water mode, the mud-water baffle 21 is installed between the front shield flange 4 and the middle shield 2. After the front shield flange 4, the connecting plate 14, and the ring plate 9 are welded together, a common opening is made on these three components. Figure 7 The integral first sealing groove 15 shown has an O-ring sealing strip 3 inside, which acts as a seal between the front shield flange 4 and the mud and water baffle 21. A second sealing groove is provided on both the mud and water baffle and the front shield flange, and an O-ring sealing strip 16 is provided inside the second sealing groove. The O-ring sealing strip 16 is installed between the front shield flange 4 and the middle shield 2 or between the mud and water baffle 21 and the middle shield 2, and acts as a seal.

[0029] The shield installation method for the above-mentioned variable-type machine disclosed in this invention includes the following steps:

[0030] S1, such as Figure 1 , 5As shown, when the tunnel boring machine is used as an earth pressure balance tunnel boring machine, the front shield flange 4 is connected to the middle shield 2 by bolts, the sealing door 27 on the stiffening plate 10 is in a closed state, and a sealed chamber can be formed between the stiffening plate 10, the panel 5, and the front shield partition 29; the panel is used for the installation of the personnel chamber; the front shield flange 4 and the middle shield 2 are connected by bolts 17, gaskets 18, and nuts 20, wherein the gasket 18 is equipped with an O-ring sealing strip 19 for sealing, and an O-ring sealing strip 16 is installed between the front shield flange 4 and the middle shield for sealing. A screw conveyor 24 is installed on the screw conveyor seat 23 for transporting excavated soil.

[0031] S2, such as Figure 2 , Figure 6 As shown, if the earth pressure balance shield machine is to be remanufactured into a slurry balance shield machine, the screw conveyor needs to be removed, and the slurry baffle 21 needs to be installed between the front shield flange 4 and the middle shield 2 using connecting bolts 22, 28, gaskets 18, and nuts 20. O-rings 19 are installed in the gaskets 18 to provide a seal, and O-rings 3 are installed between the front shield flange 4 and the slurry baffle 21, and O-rings 16 are installed between the slurry baffle 21 and the middle shield 2. At this time, the sealing door on the stiffening plate 10 is opened, and a sealed cavity is formed between the stiffening plate 12, the slurry baffle 21, and the front shield baffle 29 to be used as an air cushion chamber for the slurry shield. The slurry discharge pipe seat 25 is installed on the screw conveyor seat 23 and connected to the slurry pipeline 26 for slurry discharge.

[0032] The aforementioned variable-type shield structure can realize both earth pressure balance shield machine and slurry balance shield machine modes. As a result, when the earth pressure balance shield machine / slurry balance shield machine is remanufactured into a slurry balance shield machine / earth pressure balance shield machine of the same specification, there is no need to manufacture a new front shield, which conforms to the characteristics of green manufacturing, saves costs, greatly shortens the construction period of remanufacturing projects, and improves competitiveness.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for assembling a variable-mode shield, characterized in that, The shield body comprises a front shield, a middle shield, and a tail shield connected in sequence. The front shield includes a front shield shell and its internal components: a front shield bulkhead, a front shield flange, a central ring, ring plate one, ring plate two, ring plate three, a panel, connecting plate one, connecting plate two, and a screw conveyor base. The central ring is located at the center of the front shield and is used to install the main drive of the tunnel boring machine. The outer side of the central ring is connected to the inner wall of the front shield through the front shield bulkhead, which is arranged radially along the front shield. The front shield flange is used to connect the front shield and the middle shield. The inner side of the front shield flange is provided with a panel. The central ring is connected to the panel, connecting plate one, and connecting plate two through ring plates one, two, and three with progressively increasing inner diameters. Connecting plate one and connecting plate two are used to connect the front shield flange and ring plate three at different positions. Connecting plate one is provided with stiffening plate two, and connecting plate two is provided with stiffening plate three. Two stiffening plates one are welded between the panel and the front shield bulkhead on both sides. A sealing door is installed on stiffening plate one. It also includes a mud and water baffle; the method includes the following steps: S1. When the tunnel boring machine is used as an earth pressure balance tunnel boring machine, the front shield flange is connected to the middle shield, the sealing door on the first stiffening plate is in a closed state, and a sealed chamber is formed between the first stiffening plate, the panel, and the front shield partition; a screw conveyor is installed on the screw conveyor base for transporting excavated soil. S2. If the earth pressure balance shield machine is to be converted into a slurry balance shield machine, the screw conveyor is first removed and the slurry baffle is installed between the front shield flange and the middle shield. At this time, the sealing door on the first stiffener plate is opened, and a sealed cavity is formed between the third stiffener plate, the slurry baffle, and the front shield baffle to be used as an air cushion chamber for the slurry shield. The slurry discharge pipe seat is installed on the screw conveyor seat and connected to the slurry pipeline for slurry discharge.

2. The method for assembling a variable-mode shield as described in claim 1, characterized in that, In earth pressure mode, the front shield flange and the middle shield are connected by bolts, gaskets and nuts.

3. The method for assembling a variable-mode shield as described in claim 1, characterized in that, After the front shield flange, connecting plate two, and ring plate three are connected as one unit, a first sealing groove that is interconnected is opened on these three components. An O-ring sealing strip is provided in the first sealing groove. The O-ring sealing strip is placed between the front shield flange and the mud and water partition to play a sealing role.

4. The method for assembling a variable-mode shield as described in claim 1, characterized in that, A second sealing groove is provided on both the mud and water baffle and the front shield flange. An O-ring seal is provided in the second sealing groove. The O-ring seal is installed between the front shield flange and the middle shield or between the mud and water baffle and the middle shield to achieve a sealing effect.

5. The method for assembling the shield body of the variable-type structure as described in claim 2, characterized in that, The pad is equipped with an O-ring sealing strip.

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