Construction method of mud pipe of super-large diameter slurry shield

Abstract

The present application provides a large-diameter slurry shield mud pipe split construction method, comprising steps S1-S5, the trailer side mud hard pipe of the shield machine is extended backward to the bottom plate under the trailer side mud hard pipe tail of the last section, and a control valve and a reducing joint are installed in sequence at the pipe opening of the trailer side mud hard pipe output end; the reducing joint is connected with the ground side mud hard pipe laid in the tunnel by using a connecting hose to form a mud circulation loop; as the shield machine advances, the connecting hose extends accordingly; when the preset stroke is reached, the control valve is closed, the connection between the connecting hose and the ground side mud hard pipe is removed, and the new extended hard pipe is connected after being connected. The present application optimizes the pipeline layout and connection process, solves the problems of long soft pipe layout difficulty, easy pipe explosion and serious mud waste during large-diameter shield construction, and significantly improves the construction safety and efficiency.

Description

Technical Field

[0001] This invention relates to the field of underground engineering construction technology, specifically to a method for the separate construction of slurry pipes in ultra-large diameter slurry shield tunnels. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] In subway, high-speed rail, and water conservancy projects, shield tunneling has been widely used. With increasing engineering demands, the use of large-diameter and ultra-large-diameter slurry balance shield tunneling machines is becoming increasingly frequent. For shield tunneling machines of conventional diameter, the technology for separate launching and pipeline extension is relatively mature. However, for ultra-large-diameter slurry shield tunneling machines, due to the large diameter and high pressure of their slurry pipelines, current construction methods typically use long extension hoses to meet the needs of tunneling extension. This "long hose" mode has many drawbacks: First, long hoses require a huge amount of space for coiling, resulting in a messy construction site at the rear of the trolley, with complex pipelines affecting other operations. Second, under the pressure and high-velocity slurry scouring and vibration, single-layer steel wire hoses are prone to bursting accidents. If multi-layer steel wire hoses are used, although the strength is improved, their flexibility decreases, and the difficulty of coiling and connecting increases dramatically. Furthermore, when pipeline splicing is required, a large amount of slurry remains inside the long hose, which cannot be effectively cut off during disassembly, leading to a large amount of slurry leakage and waste, and environmental pollution.

[0004] To address these issues, this invention provides a method for constructing ultra-large diameter slurry shield tunnels using a split slurry pipe system. Summary of the Invention

[0005] The main objective of this invention is to provide a method for the separate construction of slurry pipes in ultra-large diameter slurry shield tunnels that is adaptable to ultra-large diameter working conditions, safe, efficient, and environmentally friendly.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a method for constructing ultra-large diameter slurry shield tunnels using a split slurry pipe system, comprising the following steps: S1. Hard pipe extension: Extend the slurry hard pipe on the trailer side backward so that it crosses each section of the tunnel boring machine trailer and arrange the pipe opening of the slurry hard pipe on the trailer side at the bottom plate located at the rear of the last section of the tunnel boring machine trailer. S2. Port configuration: At the outlet of the mud hard pipe on the trailer side, a control valve and a reducer are installed sequentially along the mud transmission direction. S3. Install the connecting hose. Select a connecting hose, connect the input end of the connecting hose to the output end of the reducing connector, and connect the output end of the connecting hose to the input end of the mud hard pipe on the ground side to form a complete mud circulation loop. S4. Tunneling and Extension: Start the tunnel boring machine to tunnel forward and drag the connecting hose to extend it; stop tunneling when the tunneling distance reaches the preset length or the connecting hose is stretched to its limit. S5. Pipeline connection: Close the control valve and the corresponding valve on the ground-side slurry hard pipe, and disconnect the connection between the connecting hose and the ground-side slurry hard pipe; connect an extension hard pipe between the ground-side slurry hard pipe and the connecting hose, and after completing the pipeline connection, reopen all valves to restore slurry drainage circulation.

[0007] Furthermore, it also includes: step S0, pipeline selection and layout, determining the pipe diameter specifications of the trailer-side slurry hard pipe and the ground-side slurry hard pipe connected to it.

[0008] Furthermore, the nominal diameter of the trailer-side mud pipe is smaller than the nominal diameter of the ground-side mud pipe.

[0009] Furthermore, the nominal diameter of the trailer-side slurry hard pipe is DN450, and the nominal diameter of the ground-side slurry hard pipe is DN500.

[0010] Furthermore, in step S1, the slurry rigid pipe on the trailer side is fixed to the main structure of the tunnel boring machine trailer by a bracket.

[0011] Furthermore, in step S1, the slurry hard pipe on the trailer side is led out from the middle plate position of each section of the tunnel boring machine trailer, crosses the last section of the tunnel boring machine trailer, and is lowered to the bottom plate position.

[0012] Furthermore, the height of the mud hard pipe output end on the trailer side is lower than the height of the middle plate, and it is located within the space where the bottom plate is located.

[0013] Furthermore, in step S2, the control valve is a gate valve, used to cut off the mud flow in the mud hard pipe on the trailer side when the pipeline is connected, to prevent mud backflow and leakage.

[0014] Furthermore, in step S4, the length of the extended rigid pipe is matched with the single pipe connection stroke of the tunnel boring machine, and the preset length corresponds to the length of a single extended rigid pipe.

[0015] Furthermore, in step S5, when connecting the extension rigid pipe between the ground-side mud rigid pipe and the connecting hose, first connect the output end of the extension rigid pipe to the flange of the original ground-side mud rigid pipe input end, and then connect the output end of the connecting hose to the input end of the extension rigid pipe.

[0016] The beneficial effects of this invention are reflected in: The present invention provides a method for the separate construction of slurry pipes for ultra-large diameter slurry shield tunnels. By optimizing the pipeline layout and splicing process, it solves the problems of difficult long hose coiling, easy pipe bursting, and serious slurry waste during pipe splicing in ultra-large diameter shield tunnel construction, and significantly improves construction safety and efficiency. Attached Figure Description

[0017] In the attached diagram: Figure 1 This is a flowchart illustrating the construction method of the present invention; Figure 2 A schematic diagram of the structure of the tunnel boring machine trailer with the rigid mud pipes on the trailer side arranged on the rear. Figure 3 This is a schematic diagram of the connection between the rigid mud pipe and the connecting hose on the trailer side. Figure 4 A schematic diagram of the structure on the platform for arranging connecting hoses; Figure 5 This is a schematic diagram of the structure in the assembled state between the extension rigid tube and the connecting flexible tube.

[0018] Explanation of reference numerals in the attached figures: 1. Mud pipe on trailer side; 3. Tunnel boring machine trailer; 4. Middle plate; 5. Bottom plate; 6. Control valve; 7. Reducer; 8. Connecting hose; 9. Extension pipe; 10. Platform; 11. Baffle; 12. Mobile bracket. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the invention, and not all of them. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] Please combine Figures 1 to 5 The construction method for separate mud pipes in ultra-large diameter slurry shield tunneling includes the following steps: S0. Pipeline selection and layout: Determine the pipe diameter specifications of the trailer-side slurry hard pipe 1 on the shield machine trailer 3 and the ground-side slurry hard pipe connected to it.

[0021] The nominal diameter of the trailer-side slurry hard pipe 1 is smaller than that of the ground-side slurry hard pipe. Preferably, the nominal diameter of the trailer-side slurry hard pipe is DN450 and the nominal diameter of the ground-side slurry hard pipe is DN500.

[0022] S1. Hard pipe extension: Extend the slurry hard pipe 1 on the trailer side backward so that it crosses each section of the tunnel boring machine trailer 3 on the tunnel boring machine, and arrange the pipe opening of the slurry hard pipe 1 on the trailer side at the bottom plate 5 located at the rear of the last section of the tunnel boring machine trailer 3.

[0023] It should be noted that the slurry rigid pipe 1 on the trailer side is fixed to the main structure of the tunnel boring machine trailer 3 by a bracket.

[0024] The slurry rigid pipe 1 on the trailer side extends from the middle plate 4 of each tunnel boring machine trailer 3, crosses the last section (usually four trailers) of the tunnel boring machine trailer 3, and is lowered to the bottom plate 5. Preferably, the height of the output end of the slurry rigid pipe 1 on the trailer side is lower than the height of the middle plate 4, and is located within the space of the bottom plate 5. This arrangement utilizes the good stability of the rigid pipe and reduces pipeline vibration.

[0025] S2. Port configuration: At the outlet of the mud hard pipe 1 on the trailer side, install control valve 6 and reducer 7 (such as DN450 to DN500) in sequence along the mud transmission direction. The reducer 7 is used to adapt to pipes with larger diameters on the ground (ground side mud hard pipe) to reduce friction resistance.

[0026] Preferably, the control valve 6 is a gate valve, used to cut off the mud flow in the trailer-side mud pipe 1 when the pipeline is connected, to prevent mud backflow and leakage. A ball valve is installed on the reducer 7 for depressurization before connecting the pipeline.

[0027] In practice, on the flange at the output end of the slurry hard pipe 1 (DN450) on the bottom plate 5 of the tunnel boring machine trailer 3 located at the end section, a manual gate valve and a concentric or eccentric reducer 7 for converting DN450 to DN500 are installed sequentially along the slurry conveying direction.

[0028] S3. Install the connecting hose. Select a connecting hose 8, connect the input end of the connecting hose 8 to the output end of the reducer 7, and connect the output end of the connecting hose 8 to the input end of the mud hard pipe on the ground side to form a complete mud circulation loop.

[0029] In practice, a high-pressure rubber hose of appropriate length (e.g., 6-10 meters, sufficient to cover a single pipe connection stroke) is selected. One end of the connecting hose 8 is connected to the output port of the reducer 7, and the other end is connected to the DN500 ground-side slurry hard pipe inlet port.

[0030] It should be noted that before arranging the connecting hose 8, a two-centimeter-thick steel plate should be laid on the base plate 5 as a platform 10 to support the sliding of the connecting hose 8, and a baffle 11 should be welded on the steel plate to constrain the connecting hose 8 and prevent interference between the connecting hose 8 and the ladder cage. In addition, lubricant (grease) should be evenly applied to the sliding area of ​​the connecting hose 8 on the steel plate.

[0031] S4. Tunneling and Extension: Start the tunnel boring machine to tunnel forward, and drag the connecting hose 8 to extend it. Stop tunneling when the tunneling distance reaches the preset length or the connecting hose 8 is stretched to its limit.

[0032] In step S4, the length of the extension rigid pipe 9 is matched with the single pipe connection stroke of the tunnel boring machine, and the preset length corresponds to the length of a single extension rigid pipe 9.

[0033] S5. Pipeline connection: Close control valve 6 and the corresponding valves on the ground-side slurry hard pipe, and disconnect the connecting hose 8 from the ground-side slurry hard pipe. Connect an extension hard pipe 9 between the ground-side slurry hard pipe and the connecting hose 8. After completing the pipeline connection, reopen all valves to resume slurry drainage circulation.

[0034] When connecting the extension rigid pipe 9 between the ground-side slurry rigid pipe and the connecting hose 8, first connect the output end of the extension rigid pipe 9 to the flange of the original ground-side slurry rigid pipe input end, and then connect the output end of the connecting hose 8 to the input end of the extension rigid pipe 9.

[0035] During actual construction: During the tunneling phase, as the tunnel boring machine (TBM) advances forward, the TBM trailer 3 moves the DN450 trailer-side mud pipe 1 and control valve 6 forward, and the connecting hose 8 is stretched and extended accordingly.

[0036] During the takeover preparation phase, when the tunnel boring machine advances to the length of a standard ground-side slurry pipe (such as 6 meters or 1 ring), the slurry circulation pump is stopped.

[0037] During the closure operation, the gate valve at the rear of the tunnel boring machine trailer 3 is manually closed to ensure that the mud stored in each trailer and the main machine pipeline does not flow out. At the same time, the corresponding valves on the mud hard pipe on the ground side are closed, and the ball valve on the reducer 7 is opened to release pressure.

[0038] During the follow-up operation, the connecting hose 8 is disconnected from the connecting flange of the ground-side mud hard pipe (two lifting points are set at the rear end of the wellhead, and two 5T chain hoists are suspended to disconnect the connecting hose 8 from the flange of the trailer-side mud hard pipe 1, and then the connecting hose 8 is retrieved with the help of the chain hoists). A new extension hard pipe 9 is hoisted using the segment crane and installed at the input end of the ground-side mud hard pipe on the original ground.

[0039] During the reconnection phase, the output end of the connecting hose 8 is pulled to the input end of the newly installed extension rigid pipe 9 and connected and secured (because the extension rigid pipe 9 needs to move forward with the tunnel boring machine trailer 3, a movable bracket 12 needs to be added to the extension rigid pipe 9. The movable bracket 12 is composed of casters and 10# channel steel. Two movable brackets 12 are installed on each extension rigid pipe 9).

[0040] During the production recovery phase, the gate valve is opened to restore mud circulation and tunneling continues.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0042] It should be noted that if the embodiments of the invention involve directional indicators (such as up and down), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. Additionally, if the embodiments of the invention involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the invention.

Claims

1. A method for constructing ultra-large diameter slurry shield tunnels using a split-section slurry pipe system, characterized in that: Includes the following steps: S1. Hard pipe extension: extend the trailer-side mud hard pipe (1) backward so that it crosses each section of the shield machine trailer (3) on the shield machine, and arrange the pipe opening of the trailer-side mud hard pipe (1) at the bottom plate (5) located at the tail of the last section of the shield machine trailer (3). S2, Port configuration: At the outlet of the mud hard pipe (1) on the trailer side, a control valve (6) and a reducer (7) are installed in sequence along the mud transmission direction. S3. Install connecting hoses. Select a connecting hose (8), connect the input end of the connecting hose (8) to the output end of the reducing connector (7), and connect the output end of the connecting hose (8) to the input end of the mud hard pipe on the ground side to form a complete mud circulation loop. S4. Tunneling and Extension: Start the tunnel boring machine to tunnel forward and drag the connecting hose (8) to extend; when the tunneling distance reaches the preset length or the connecting hose (8) is stretched to the limit, stop tunneling; S5. Pipeline connection: Close the control valve (6) and the corresponding valve on the ground-side slurry hard pipe, and disconnect the connection between the connecting hose (8) and the ground-side slurry hard pipe; connect an extension hard pipe (9) between the ground-side slurry hard pipe and the connecting hose (8), and reopen all valves after completing the pipeline connection to restore the slurry discharge circulation.

2. The method for constructing ultra-large diameter slurry shield tunnels with separate slurry pipes as described in claim 1, characterized in that, It also includes: step S0, pipeline selection and layout, determining the pipe diameter specifications of the trailer-side slurry hard pipe (1) and the ground-side slurry hard pipe connected behind it.

3. The method for constructing ultra-large diameter slurry shield tunnels with separate slurry pipes as described in claim 2, characterized in that, The nominal diameter of the trailer-side mud pipe (1) is smaller than the nominal diameter of the ground-side mud pipe.

4. The method for constructing ultra-large diameter slurry shield tunneling slurry pipes in separate sections as described in claim 3, characterized in that, The nominal diameter of the trailer-side slurry hard pipe (1) is DN450, and the nominal diameter of the ground-side slurry hard pipe is DN500.

5. The method for constructing ultra-large diameter slurry shield tunnels with separate slurry pipes as described in claim 1, characterized in that, In step S1, the slurry hard pipe (1) on the trailer side is fixed to the main structure of the tunnel boring machine trailer (3) by a bracket.

6. The method for constructing ultra-large diameter slurry shield tunnels with separate slurry pipes as described in claim 1, characterized in that, In step S1, the slurry hard pipe (1) on the trailer side is led out from the middle plate (4) of each section of the shield machine trailer (3), crosses the last section of the shield machine trailer (3), and is lowered to the bottom plate (5).

7. The method for constructing ultra-large diameter slurry shield tunneling slurry pipes in separate sections as described in claim 6, characterized in that, The height of the output end of the slurry hard pipe (1) on the trailer side is lower than the height of the middle plate (4) and is located in the space where the bottom plate (5) is located.

8. The method for constructing ultra-large diameter slurry shield tunnels with separate slurry pipes as described in claim 1, characterized in that, In step S2, the control valve (6) is a gate valve, used to cut off the mud flow in the trailer-side mud hard pipe (1) when the pipeline is connected, to prevent mud backflow and leakage.

9. The method for constructing ultra-large diameter slurry shield tunneling slurry pipes in separate sections as described in claim 1, characterized in that, In step S4, the length of the extension rigid pipe (9) is matched with the single pipe connection stroke of the tunnel boring machine, and the preset length corresponds to the length of a single extension rigid pipe (9).

10. The method for constructing ultra-large diameter slurry shield tunnels with separate slurry pipes as described in claim 1, characterized in that, In step S5, when connecting the extension hard pipe (9) between the ground-side mud hard pipe and the connecting hose (8), first connect the output end of the extension hard pipe (9) to the flange of the original ground-side mud hard pipe input end, and then connect the output end of the connecting hose (8) to the input end of the extension hard pipe (9).

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