A method for sealing the working face and cutter head during disassembly inside a shield tunnel

Abstract

The invention discloses a construction method for shield tunnel face and cutter head plugging, which ensures the tunnel face safety during the shield tunnel dismantling operation by filling the soil bin with inert slurry and then performing artificial slow excavation bin, cutter head plugging and support. After the shield tunnel dismantling is completed, the main bearing pressure partition is plugged and supported again, and the inert slurry is refilled, so that the cutter head, the inert slurry solidified body and the main bearing sealing plate form a retaining wall to ensure the stability of the tunnel face after the shield tunnel dismantling.

Description

Technical Field

[0001] The present invention relates to the field of subway construction, and specifically refers to a method for sealing the working face and cutter head during shield machine disassembly in the tunnel. Background Art

[0002] Subway tunnel construction mainly adopts the mining method and the shield method. Because the shield method has high adaptability and can be carried out in many harsh underground environments with little impact on the surrounding traffic conditions, the shield method has begun to dominate in tunnel construction. Conventional shield construction requires a shield shaft to realize the starting and exiting of the shield machine. However, with the expansion of underground space, some unforeseen factors often affect shield reception. There may be a situation where the shield machine has reached the reception section but the shield reception shaft has not been completed yet. If the shield machine stops underground for a long time waiting for the shield reception shaft to provide reception conditions, it will cause a large amount of resource waste and have a high risk. Under this background, some projects often choose to disassemble the shield machine in the tunnel. And how to effectively ensure the safety and stability of the working face during shield machine disassembly in the tunnel and after the shield machine is disassembled in the tunnel is a major problem in the industry. Summary of the Invention

[0003] To solve the above technical problems, the technical solution provided by the present invention is: a construction method for sealing the shield working face and cutter head, including the following steps:

[0004] S1. Inert slurry filling: To improve the stability of the working face, the soil chamber is filled with inert slurry. Before filling the chamber, the entire shield machine is retracted backward by about 10 cm, so that after filling the chamber, there is a 10-cm slurry solid in front of the working face, increasing the stability of the working face;

[0005] S2. Cutter head sealing: After the inert slurry starts to set, the chamber is dug manually with a shovel. After the opening position of the cutter head is dug out, the cutter head sealing plate is immediately welded to seal the cutter head opening to prevent the muck from the working face from entering the soil chamber and causing the collapse of the working face;

[0006] S3. Cutter head support welding: After the construction of the cutter head sealing plate is completed, to prevent the cutter head from tipping over after the internal structure of the shield is removed later, the cutter head support construction is carried out. Specifically: adjust the cutter head angle, turn the 0° position to directly above, process I-beams as the cutter head support, and weld the cutter head, the shield shell, and the main bearing pressure partition into a whole. After the installation of the cutter head support structure is completed, the disassembly operation of the shield machine in the tunnel can be started.

[0007] S4. Pressure partition sealing: After all the internal structures of the shield machine are disassembled, the pressure partition is sealed. The pressure partition sealing plate is made of steel plate to completely seal the pressure partition opening and the screw conveyor opening, and then the soil chamber is filled with inert slurry through the reserved opening, so that the cutter head, the inert slurry solid, and the pressure partition are combined into a retaining wall to ensure the stability of the working face;

[0008] S5. Welding support for pressure-bearing partition: The support for the pressure-bearing partition is processed from I-beams and is divided into vertical supports for the sealing plate of the pressure-bearing partition, horizontal supports for the sealing plate of the pressure-bearing partition, and inclined supports for the sealing plate of the pressure-bearing partition. Among them, there are 3 vertical supports for the sealing plate of the pressure-bearing partition, 3 horizontal supports for the sealing plate of the pressure-bearing partition, and 3 inclined supports for the sealing plate of the pressure-bearing partition. The inclined supports for the sealing plate of the pressure-bearing partition are welded to the upper interfaces of the vertical supports for the sealing plate of the pressure-bearing partition and the horizontal supports for the sealing plate of the pressure-bearing partition respectively. The sealing plate of the pressure-bearing partition, the vertical supports for the sealing plate of the pressure-bearing partition, and the inclined supports for the sealing plate of the pressure-bearing partition are welded to the bottom plate of the shield shell, and the two ends of the horizontal supports for the sealing plate of the pressure-bearing partition are welded to the left and right waists of the shield shell, which can not only ensure the stability of the support system for the pressure-bearing partition but also effectively prevent the deformation of the shield shell.

[0009] The advantages of the present invention compared with the prior art are as follows:

[0010] 1. The present invention can block the shield face and the cutter head when the shield receiving shaft does not meet the construction conditions, enabling the shield machine to have the conditions for dismantling and disassembling under normal pressure in the tunnel and completing the tunnel construction in advance.

[0011] 2. After the shield machine is dismantled and disassembled in the tunnel, the present invention can block the shield face and the cutter head again, enabling the inert slurry solid formed by the combination of the pressure-bearing partition, the cutter head, and the inert slurry filled in the soil bin to form a retaining wall, ensuring the safety and stability of the shield face after the dismantling and disassembling in the shield tunnel. Description of the Drawings

[0012] Figure 1 is a schematic diagram of inert slurry filling in a construction method for blocking a shield face and a cutter head according to the present invention

[0013] Figure 2 is a schematic diagram of cutter head blocking and support in a construction method for blocking a shield face and a cutter head according to the present invention

[0014] Figure 3 is a plan layout diagram of cutter head sealing plate segmentation in a construction method for blocking a shield face and a cutter head according to the present invention

[0015] Figure 4 is a plan layout diagram of cutter head support in a construction method for blocking a shield face and a cutter head according to the present invention

[0016] Figure 5 is a plan layout diagram of cutter head and pressure-bearing partition sealing plate support in a construction method for blocking a shield face and a cutter head according to the present invention

[0017] Figure 6 is a plan layout diagram of pressure-bearing partition sealing plate support in a construction method for blocking a shield face and a cutter head according to the present invention

[0018] As shown in the figure: 1. Shield shell, 2. Cutter head, 3. Inert slurry, 4. Cutter head sealing plate, 5. Cutter head cross brace, 6. Cutter head vertical brace, 7. Main bearing pressure partition plate, 8. Pressure partition plate sealing plate, 9. Pressure partition plate sealing plate vertical brace, 10. Pressure partition plate sealing plate cross brace, 11. Pressure partition plate sealing plate diagonal brace;

[0019] 4-1 to 4-34, No. 1 block to No. 34 block of the cutter head sealing plate, 5-1. Upper cross brace of the cutter head, 5-2. Lower cross brace of the cutter head, 5-1a. First upper cross brace of the cutter head, 5-1b. Second upper cross brace of the cutter head, 5-1c. Third upper cross brace of the cutter head, 5-2a. First lower cross brace of the cutter head, 5-2b. Second lower cross brace of the cutter head, 5-2c. Third lower cross brace of the cutter head, 6a. First cutter head vertical brace, 6b. Second cutter head vertical brace, 6c. Third cutter head vertical brace, 9a. First pressure partition plate sealing plate vertical brace, 9b. Second pressure partition plate sealing plate vertical brace, 9c. Third pressure partition plate sealing plate vertical brace, 10a. First pressure partition plate sealing plate cross brace, 10b. Second pressure partition plate sealing plate cross brace, 10c. Third cross brace of the pressure partition plate sealing plate. Detailed implementation mode

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0021] In the description of the embodiments of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0022] In addition, if terms such as "horizontal", "vertical", "hanging" are used, it does not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0023] In the description of the embodiments of the present invention, "a plurality of" represents at least 2.

[0024] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "install", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Embodiment:

[0026] Combined with the attached Figures 1-6 , this embodiment discloses a construction method for shield face and cutter head plugging, including the following steps:

[0027] S1. Inert slurry filling: During the disassembly operation in the shield tunnel, considering that manual entry into the chamber under normal pressure is required for the disassembly of the main bearing, in order to improve the stability of the face, the soil bin is filled with inert slurry 3; before filling the bin, the entire shield machine is retracted backward by about 10 cm by increasing the soil pressure and loosening the propulsion cylinders, so that after filling the bin, there is a slurry solid of 10 cm in front of the face, increasing the stability of the face; the initial setting time of the inert slurry is preferably about 8 h, and the compressive strength should be greater than 1.0 Mpa; among them, the inert slurry 3 is composed of the following raw materials in parts by mass: 450 - 500 kg of water, 100 - 200 kg of cement, 750 - 850 kg of sand, 450 - 550 kg of fly ash, 50 - 150 kg of bentonite, and 30 - 50 kg of slaked lime.

[0028] S2. Cutter head plugging: After the inert slurry 3 has initially set, manual excavation is carried out with a shovel to dig out the opening position of the cutter head 2, and immediately after that, the cutter head sealing plate 4 is welded to seal the opening of the cutter head 2 to prevent the face muck from entering the soil bin and causing the face to collapse; the cutter head sealing plate 4 is gradually welded by 34 steel plates, and the welding sequence principle is "from top to bottom, symmetrically welded left and right step by step" until all the gaps between the back of the cutter head and the front shield and the cutter head opening gap are sealed. Combining with the attached drawings, the overall sequence is 4 - 1, 4 - 2, 4 - 3 → 4 - 5, 4 - 6, 4 - 7 → 4 - 8, 4 - 9 → 4 - 10, 4 - 11 → 4 - 12, 4 - 13 → 4 - 14, 4 - 15 → 4 - 16, 4 - 17 → 4 - 18, 4 - 19 → 4 - 20 → 4 - 21, 4 - 22 → 4 - 23, 4 - 24 → 4 - 25, 4 - 26 → 4 - 27, 4 - 28 → 4 - 19~31 → 4 - 32, 4 - 33, 4 - 34.

[0029] S3. Cutterhead support welding: After the construction of the cutterhead sealing plate 4 is completed, in order to prevent the cutterhead 2 from tipping over after the internal structure of the shield machine is demolished later, the cutterhead support construction is carried out; adjust the angle of the cutterhead 2, turn the 0° position to directly above, process I-beams as the cutterhead support, and weld the cutterhead to the shield shell 1 and the main bearing pressure partition plate 7 into a whole; the cutterhead support system consists of the cutterhead cross braces 5 and the cutterhead vertical braces 6. Among them, the cutterhead cross braces 5 are divided into the upper cutterhead cross braces 5-1 and the lower cutterhead cross braces 5-2, with 3 pieces each, namely the upper cutterhead cross brace one 5-1a, the upper cutterhead cross brace two 5-1b, the upper cutterhead cross brace three 5-1c, the lower cutterhead cross brace one 5-2a, the lower cutterhead cross brace two 5-2b, and the lower cutterhead cross brace three 5-2c; a total of 3 cutterhead vertical braces are set, namely the cutterhead vertical brace one 6a, the cutterhead vertical brace two 6b, and the cutterhead vertical brace three 6c. The lower ends of the cutterhead vertical braces 6 are welded to the shield shell 1, which can not only ensure the stability of the cutterhead 2 but also prevent the deformation of the shield shell 1 and the soil chamber; after the installation of the cutterhead support is completed, the disassembly operation of the shield machine in the tunnel can be started.

[0030] S4. Pressure partition plate plugging: After all the internal structures of the shield machine are disassembled, the pressure partition plate is plugged. Use steel plates to make the pressure partition plate sealing plate 8, completely seal the openings of the pressure partition plate 7 and the screw conveyor opening, and then fill the inside of the soil chamber with inert slurry 3 through the reserved opening, so that the cutterhead 2, the solid of the inert slurry 3 and the pressure partition plate 7 or the pressure partition plate sealing plate 8 are combined into a retaining wall to ensure the stability of the heading face.

[0031] S5. Pressure partition plate support welding: The pressure partition plate support is processed by I-beams and is divided into the pressure partition plate sealing plate vertical braces 9, the pressure partition plate sealing plate cross braces 10, and the pressure partition plate sealing plate diagonal braces 11; among them, there are 3 pressure partition plate sealing plate vertical braces 9 in total, namely the pressure partition plate sealing plate vertical brace one 9a, the pressure partition plate sealing plate vertical brace two 9b, and the pressure partition plate sealing plate vertical brace three 9c; there are 3 pressure partition plate sealing plate cross braces 10 in total, namely the pressure partition plate sealing plate cross brace one 10a, the pressure partition plate sealing plate cross brace two 10b, and the pressure partition plate sealing plate cross brace three 10c; there are 3 pressure partition plate sealing plate diagonal braces 11 in total, which are welded to the upper interfaces of the pressure partition plate sealing plate vertical braces 9 and the pressure partition plate sealing plate cross braces 10 respectively; the construction sequence of the pressure partition plate support is: the pressure partition plate sealing plate vertical brace 9 → the third pressure partition plate sealing plate cross brace → the second pressure partition plate sealing plate cross brace → the first pressure partition plate sealing plate cross brace → the pressure partition plate sealing plate diagonal brace 11; the pressure partition plate sealing plate 8, the pressure partition plate sealing plate vertical brace 9, and the pressure partition plate sealing plate diagonal brace 11 are welded to the bottom plate of the shield shell 1, and both ends of the pressure partition plate sealing plate cross brace 10 are welded to the left and right waists of the shield shell 1, which can not only ensure the stability of the pressure partition plate support system but also effectively prevent the deformation of the shield shell 1.

[0032] I. Specific case:

[0033] The shield tunneling method is adopted for the section from Nanyou Station to Chuangye Road Station of the west extension line of Shenzhen Metro Line 9, Section 9112-2. However, due to the impact of the unconstructed shield shaft of Chuangye Road Station, the receiving station of the shield machine, the shield machine cannot be hoisted out. The area for disassembling the shield machine is directly under the sidewalk on the north side of Chuangye Road. The surrounding buildings are mainly Yihai Building, Haiwang Building, etc. The closest distance to the tunnel is 12 meters. The distribution of underground pipelines on the ground is complex, with many municipal pipelines such as medium-pressure gas pipelines, communication lines, sewage culverts, rainwater pipes, and power lines. The relocation is complex and the pipeline routing is uncertain. The construction period for pipeline relocation cannot be determined, which directly affects the construction of the shield shaft and the receiving time of the shield machine, resulting in project performance risks.

[0034] Therefore, in this project, a construction method for plugging the shield face and cutter head is adopted to ensure the in-tunnel disassembly of the shield machine in soft strata with dense underground pipelines, greatly shortening the project construction period, achieving the early completion of the tunnel, and ensuring the stability and safety of the working face during and after the in-tunnel disassembly of the shield machine.

[0035] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative work without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A construction method for sealing a shield face and cutter head, characterized in that, It includes the following steps: S1. Inert slurry filling: To improve the stability of the heading face, the soil bin is filled with inert slurry. Before filling the bin, the shield machine is retracted backward by 10 cm as a whole. After filling the bin, there is a 10-cm slurry solid in front of the heading face, which increases the stability of the heading face; S2. Cutter head sealing: After the inert slurry begins to set, the bin is excavated manually with a shovel. After the opening position of the cutter head is dug out, the cutter head opening is immediately welded and sealed with a cutter head sealing plate to prevent the muck at the heading face from entering the soil bin and causing the collapse of the heading face; S3. Cutter head support welding: After the construction of the cutter head sealing plate is completed, to prevent the cutter head from tipping over after the internal structure of the shield is removed later, the cutter head support construction is carried out. Specifically: adjust the cutter head angle, turn the 0° position to directly above, process I-beams as the cutter head support, and weld the cutter head, the shield shell, and the main bearing pressure partition into a whole. After the installation of the cutter head support structure is completed, the in-hole disassembly operation of the shield machine can be started; S4. Pressure partition sealing: After all the internal structures of the shield machine are disassembled, the pressure partition is sealed. The pressure partition sealing plate is made of steel plates, and the openings of the pressure partition and the screw conveyor are all sealed. Then, inert slurry is filled into the soil bin through the reserved opening, so that the cutter head, the inert slurry solid, and the pressure partition are combined into a retaining wall to ensure the stability of the heading face; S5. Pressure partition support welding: The pressure partition support is processed by I-beams and is divided into the vertical support of the pressure partition sealing plate, the horizontal support of the pressure partition sealing plate, and the inclined support of the pressure partition sealing plate; among them, there are 3 vertical supports of the pressure partition sealing plate, 3 horizontal supports of the pressure partition sealing plate, and 3 inclined supports of the pressure partition sealing plate. The inclined supports of the pressure partition sealing plate are respectively welded to the upper interfaces of the vertical support of the pressure partition sealing plate and the horizontal support of the pressure partition sealing plate; the pressure partition sealing plate, the vertical support of the pressure partition sealing plate, and the inclined support of the pressure partition sealing plate are welded to the bottom plate of the shield shell, and both ends of the horizontal support of the pressure partition sealing plate are welded to the left and right waists of the shield shell, which can ensure the stability of the pressure partition support system and effectively prevent the deformation of the shield shell.

2. The construction method for shield face and cutter head plugging according to claim 1, characterized in that, In step S1, the initial setting time of the inert slurry should be 8 h, and the compressive strength should be greater than 1.0 Mpa.

3. According to the construction method of a shield heading face and cutter head sealing described in claim 1, in step S1, before filling the bin, the shield machine is retracted backward by 10 cm by increasing the soil pressure and loosening the propulsion cylinders.

4. According to the construction method of a shield heading face and cutter head sealing described in claim 1, in step S2, the cutter head sealing plate is gradually welded by 34 steel plates, and the welding sequence principle is "from top to bottom, symmetrically from left to right and gradually welded" until the gaps between the back of the cutter head and the front shield and the cutter head opening gap are all sealed.

5. According to the construction method of a shield heading face and cutter head sealing described in claim 1, in step S3, the cutter head support structure consists of the cutter head horizontal support and the cutter head vertical support. Among them, the cutter head horizontal support is divided into the upper cutter head horizontal support and the lower cutter head horizontal support, with 3 each, and a total of 3 cutter head vertical supports are provided.

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