Slurry shield small space multi-section fixed-point slurry pipeline extension system and construction method

Abstract

The application discloses a kind of slurry shield small space multi-interval fixed-point slurry pipeline extension system and construction method, solve the existing tunnel construction curvature, insufficient space and need to start well under the condition of whole start-up, slurry pipeline extension difficult, not adapt to multiple construction interval, slurry pipeline is in the same side requirement problem.The slurry pipeline extension system of the application, including the slurry pipeline extension device being arranged at the wellhead of start well and the slurry pipeline support device being laid in the tunnel being excavated;Slurry pipeline extension device is arranged at the initial end of slurry pipeline support device, and slurry pipeline support device bears slurry pipe and moves synchronously with shield machine;Slurry pipeline support device can be adapted to slurry pipeline extension device in multiple directions in the tunnel being excavated respectively, to complete multi-interval slurry pipeline extension with start well position as fixed point center.The application reduces the total length of trailer by arranging slurry pipeline extension device at the wellhead of start well, and meets the whole start-up requirement of minimum start well by fully utilizing tunnel space.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to a slurry shield tunneling pipeline extension system. Background Technology

[0002] During tunnel construction, shield tunneling launches are generally divided into integral launches and segmented launches. Due to the rapid development of urban underground space, the requirements for site conditions are extremely stringent. Therefore, shield tunneling launches often encounter situations where there is insufficient construction site space, making integral launches increasingly difficult. Segmented launches, on the other hand, affect the construction period and cost. This is especially true in the field of slurry shield tunneling, where the demand for site conditions is even greater. If the launch shaft is extremely small and the construction team wants to perform an integral launch, it is often difficult to achieve.

[0003] In the prior art, such as the patent with publication number CN 110985036 A, a mud-water shield tunneling mud pipeline extension device and extension method are disclosed. This technology requires the mud pipeline extension device to be arranged on a trailer, resulting in an excessively long trailer structure, which cannot meet the construction requirements of small space and overall starting, and is only applicable to ultra-large diameter mud-water shield tunnels. In addition, this mud extension device can only be used for pipeline extension in unidirectional tunnel construction. If the starting shaft is located in the middle of the tunnel and bidirectional section construction is required, it cannot meet the requirement that the mud pipeline is on the same side. Summary of the Invention

[0004] To address the shortcomings of the aforementioned background technology, this invention proposes a slurry pipeline extension system and construction method for small-space, multi-section fixed-point slurry pipelines in slurry shield tunnels. This solves the problems of existing technologies, such as the difficulty in extending slurry pipelines when the tunnel curvature is small, the space of the launching shaft is insufficient, and the need for overall launching, as well as the inability to adapt to the requirement that slurry pipelines be on the same side in multiple construction sections.

[0005] The technical solution of this invention is implemented as follows: a slurry pipeline extension system for small-space multi-section fixed-point slurry tunneling includes a slurry pipeline extension device installed at the wellhead of the launching shaft and a slurry pipeline support device laid inside the tunnel being excavated; the slurry pipeline extension device is installed at the initial end of the slurry pipeline support device, and the slurry pipeline support device carries the slurry pipe and moves synchronously with the tunnel boring machine; the slurry pipeline support device, with the launching shaft as the fixed-point center, can be adapted to slurry pipeline extension devices in multiple directions of tunneling to complete the extension of slurry pipelines in multiple sections.

[0006] In a further preferred embodiment, the mud pipe extension device includes a fixed frame and a movable frame that can move along the fixed frame. A telescopic pipe is fixedly mounted on the movable frame and connected to a movable flexible hose mounted on the fixed frame. The telescopic pipe is detachably connected to the mud pipe. The telescopic pipe and the mud pipe serve as the connection point for the extension pipe, facilitating quick insertion and extension of the mud pipe.

[0007] In a further preferred embodiment, the fixed frame is provided with a first slide rail arranged along the axial direction, the movable frame is provided with a pulley group that cooperates with the first slide rail, and the fixed frame is provided with a motor-driven winch connected to the movable frame for resetting the movable frame.

[0008] In a further preferred embodiment, one side of the fixed frame is provided with a mud pipe storage bracket and a mud pipe hoist, with the mud pipe hoist located above the mud pipe storage bracket; the telescopic pipe is fixed to the movable frame by a first pipe clamp and can move synchronously with the movable frame.

[0009] Further optimization involves the excavation of a tunnel comprising a first section tunnel and a second section tunnel in opposite directions of excavation. After the first section tunnel is completed, the orientation of the mud pipe storage support, mud pipe crane, telescopic pipe, and movable hose is changed to adapt to the construction of the second tunnel. The mud pipe extension device is adapted to the mud pipe support device in the second tunnel by reversing the orientation at the origin.

[0010] In a further preferred embodiment, the mud pipe support device includes a guide rail fixedly installed along the inner wall of the tunnel segments. The guide rail is laid in sections along the tunnel axis following the tunnel boring machine. The guide rail is equipped with a support frame that can move synchronously with the tunnel boring machine. The support frame is fixed one-to-one with the mud pipes in the tunnel. The support frame is connected to the tunnel boring machine through a traction mechanism.

[0011] In a further preferred embodiment, the traction mechanism includes a traction steel wire rope connected in series with a support frame, a guide wheel assembly that cooperates with the guide rail on the support frame, and a second pipe clamp for fixing the mud pipe on the support frame.

[0012] Further preferably, the guide rail includes two parallel upper rails and a lower rail; the guide wheel assembly includes an upper guide wheel assembly and a lower hanging wheel assembly mounted on a support frame, the upper guide wheel assembly cooperating with the upper rail, the lower hanging wheel assembly cooperating with the lower rail, and the traction steel wire rope is divided into two parts and connected to the upper guide wheel assembly and the lower hanging wheel assembly respectively.

[0013] Further preferably, the mud pipe includes a rigid mud pipe and a corrugated mud hose, with a corrugated mud hose provided between two adjacent rigid mud pipes; the corrugated mud hose includes a threaded hose, one end of which is connected to a front flange and the other end of which is connected to a rear flange, and an auxiliary tie rod is connected between the front flange and the rear flange, with both ends of the auxiliary tie rod extending out of the front flange and the rear flange and fixed by anti-loosening nuts.

[0014] A construction method for the aforementioned slurry shield tunneling small-space multi-section fixed-point slurry pipeline extension system comprises the following steps:

[0015] S1: The mud pipeline extension device is assembled at the corresponding position in the starting shaft, and the mud pipeline support device is installed in place. The mud pipe located inside the tunnel is defined as the tunnel mud pipe, and the mud pipe located at the extension installation position between the mud pipeline extension device and the mud pipe support device is defined as the installation position mud pipe. The first section of guide rail is installed on the segment of the first section of the tunnel, and the support frame is installed on the first section of guide rail. The support frame is fixedly connected to the tunnel mud pipe. One end of the installation position mud pipe is connected to the telescopic pipe on the mud pipeline extension device, and the other end is connected to the tunnel mud pipe. The traction steel wire rope on the mud pipeline support device is connected to the shield machine along the tunneling direction.

[0016] S2: After the start, as the tunnel boring machine advances forward, the support frame of the mud pipe support device is pulled forward on the first section of the guide rail by the traction steel wire rope, which at the same time drives the mud pipe in the tunnel, the mud pipe at the installation position, the movable frame and the telescopic pipe on the movable frame to move forward.

[0017] S3: After the tunnel boring machine moves the installation position mud pipe forward by at least one mud pipe distance and enters the tunnel, close the mud gate valve on the mud pipe to stop the mud circulation in the pipe; install the new support frame on the guide rail and fix it to the installation position mud pipe located in the tunnel.

[0018] S4: Disconnect the connection between the corrugated mud hose and the telescopic pipe of the mud pipe at the installation position; and retract the telescopic pipe, and pull the movable frame back to the initial position under the action of the motor winch;

[0019] S5: The mud pipe to be installed is lifted from the mud pipe storage bracket using a mud pipe crane. The mud pipe to be installed is placed in the extension installation position between the mud pipe extension device and the mud pipe support device with the rigid mud pipe facing forward. At this time, the mud pipe to be installed becomes the new installation position mud pipe. The rigid mud pipe of the new installation position mud pipe is connected to the corrugated mud hose of the mud pipe in the tunnel. One side of the corrugated mud hose of the new installation position mud pipe is connected to the telescopic pipe. This completes one pipeline extension. After the extension is completed, the mud gate valve is opened and the equipment continues to excavate forward.

[0020] S6: Repeat steps S3 to S5 until the construction of the first tunnel section is completed;

[0021] S7: After the first section of the tunnel is excavated, before the second section of the tunnel is excavated, the equipment is stopped, and the mud pipe crane, extension pipe storage bracket, movable hose and telescopic pipe are installed in the opposite direction. Repeat steps S1 to S6 to carry out the construction of the second section of the tunnel.

[0022] The beneficial effects of the present invention are as follows: Compared with the existing technology, the present invention reduces the total length of the trailer by arranging the mud pipeline extension device at the starting wellhead, and meets the overall starting requirements of the very small starting well by making full use of the tunnel space.

[0023] By employing a reversible design for the fixed frame, movable frame, and extension pipe storage bracket of the mud pipe extension device, the goal of ensuring the mud pipes are in the same direction can be achieved without mirroring and constructing a new mud pipe extension device in bidirectional tunneling sections. This allows for fixed-point mud pipe extension construction in multiple sections using the same equipment, simplifying construction procedures and improving efficiency. Furthermore, when the tunnel boring machine reverses direction, simply adjusting the mud pipe extension device ensures the mud pipes are on the same side during construction on both sides. A special design for the connection between the mud pipe support device and the mud pipe solves the problems of mud pipe support and adaptability within the tunnel during small turning radius tunneling.

[0024] By employing a special design that combines rigid mud pipes with corrugated flexible mud hoses, the flexible threaded hoses in the middle can adapt to the curvature of the tunnel when the pipeline needs to turn. This allows the mud pipes to adapt to turning conditions, enabling the mud pipes to move forward normally with the tunnel boring machine under small curvature construction conditions.

[0025] In summary, this invention improves the adaptability of tunnel boring machines (TBMs) to situations with small curvature in tunnel construction, insufficient space in the launching shaft, and the need for overall launching; it also improves the flexibility and efficiency of slurry shield tunneling, demonstrating significant progress and advantages in small-space slurry shield tunneling. Attached Figure Description

[0026] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a front view schematic diagram of the mud pipeline extension device of the present invention;

[0029] Figure 3 for Figure 2 View from the center (K ​​direction);

[0030] Figure 4 Top view of the invention's mud pipeline extension device;

[0031] Figure 5 This is a front view schematic diagram of the mud pipeline support device of the present invention;

[0032] Figure 6 for Figure 5 Middle HH direction view;

[0033] Figure 7 This is a top view schematic diagram of the mud pipeline support device of the present invention;

[0034] Figure 8 A schematic diagram of a corrugated hose for mud slurry;

[0035] Figure 9 A schematic diagram showing the initial launch status of the slurry shield tunneling machine in the first section of the tunnel.

[0036] Figure 10 A schematic diagram showing the status of the mud pipe extending from the slurry shield tunnel in the first section of the tunnel.

[0037] Figure 11 A schematic diagram of the mud pipeline extension device before the construction of the second tunnel section;

[0038] Figure 12 A schematic diagram showing the initial launch status of the slurry shield tunneling machine in the second section of the tunnel.

[0039] Figure 13 This is a schematic diagram of two tunnel sections;

[0040] Figure 14 This is a schematic diagram of the four tunnel sections. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1, such as Figure 1As shown, a slurry pipe extension system for small-space, multi-section fixed-point slurry pipes in a slurry shield tunneling machine includes a slurry pipe extension device 3 installed at the opening of the starting shaft 1 and a slurry pipe support device 4 laid inside the tunnel 2. By placing the slurry pipe extension device at the opening of the starting shaft, the slurry pipe support device is pulled by the power of the tunnel boring machine (TBM) during its advance, thereby driving the slurry pipe forward, minimizing the overall length of the trailer and meeting the requirements for overall starting of a minimal starting shaft. The slurry pipe extension device 3 is located on one side of the initial end of the slurry pipe support device 4; the slurry pipe extension device 3 and the initial slurry pipe support device 4 form an extension installation position for the slurry pipe. The slurry pipe support device 4 carries the slurry pipe 6 and moves synchronously with the TBM 5; the slurry pipe support device 4, with the starting shaft 1 as its fixed center, can adapt to the slurry pipe extension devices 3 in multiple directions within the tunnel 2 to complete the extension of slurry pipes in multiple sections. The mud pipeline extension device is positioned at the starting wellhead, which is located in the middle of the pipeline. The mud pipeline extension device can ensure that the mud pipeline is on the same side when construction is carried out on both sides without mirroring.

[0043] like Figure 2 As shown, in this embodiment, the preferred mud pipe extension device 3 includes a fixed frame 3.1 and a movable frame 3.2 that can move along the fixed frame 3.1. The fixed frame can meet the usage requirements in both directions, and the movable frame moves on the support frame via a sliding member, moving forward with the tunnel boring machine under the drive of the mud pipe. A telescopic pipe 3.3 is fixedly installed on the movable frame 3.2, and the telescopic pipe 3.3 is connected to a movable flexible hose 3.5 installed on the fixed frame 3.1. Inside the tunnel, the mud pipe moves the movable frame relative to the fixed frame under the action of the tunnel boring machine, and simultaneously moves the telescopic pipe. The telescopic pipe 3.3 is detachably connected to the mud pipe 6, ensuring that the mud pipe to be installed can be smoothly extended and installed between the telescopic pipe and the mud pipe inside the tunnel, realizing the step-by-step continuous extension installation of the mud pipe.

[0044] like Figure 5 As shown, the mud pipe support device 4 in this embodiment includes a guide rail 4.2 fixedly installed along the inner wall of the tunnel segments inside the tunnel 2. The guide rail 4.2 is laid in sections along the axial direction of the tunnel 2 following the tunnel boring machine (TBM), that is, the guide rail is assembled in a step-by-step manner following the TBM. The guide rail 4.2 is equipped with a support frame 4.3 that can move synchronously with the TBM 5. The support frame 4.3 is fixed one-to-one with the mud pipe 6 inside the tunnel 2. Multiple support frames can be installed on the guide rail according to the number of mud pipes. In this embodiment, one support frame corresponds to one mud pipe inside the tunnel. The support frame 4.3 is connected to the TBM 5 through a traction mechanism. During the TBM's excavation, the traction mechanism drives the support frame to move along the guide rail, ensuring the stable forward movement of the mud pipe inside the tunnel. This structural design greatly reduces the overall length of the rear-mounted trailer, meeting the requirements for overall launching in an extremely short launching shaft.

[0045] Example 2, as Figure 3 , 4 As shown, a slurry pipeline extension system for small-space multi-section fixed-point slurry tunneling is further optimized based on Embodiment 1. Specifically, the movable frame's movement structure along the fixed frame is as follows: the fixed frame 3.1 is provided with a first slide rail 3.9 arranged axially. The number of first slide rails can be one or more as needed; in this embodiment, one slide rail is used as an example. The movable frame 3.2 is provided with a pulley group 3.10 that cooperates with the first slide rail 3.9. The pulley group can be a single pulley or a double pulley. The movement of the sliding group on the first slide rail realizes the movement of the movable frame relative to the fixed frame. The fixed frame 3.1 is provided with a motor-driven winch 3.6, and the wire rope of the motor-driven winch 3.6 is connected to the movable frame 3.2 for resetting the movable frame 3.2. When the movable frame moves forward relative to the fixed frame under the action of the tunnel boring machine, when it is necessary to install the extension of the mud pipe, the connection between the telescopic pipe and the mud pipe is disconnected, and the telescopic pipe is fixed on the movable frame by the pipe clamp. Under the traction of the drive motor through the wire rope, it is reset, and the mud pipe crane can transport the mud pipe to be extended from the mud pipe storage support.

[0046] In this embodiment, the fixed frame 3.1 is equipped with a mud pipe storage bracket 3.8 and a mud pipe crane 3.7 on one side. The mud pipe storage bracket 3.8 is used to store the mud pipes to be installed. Its installation position can be changed according to the tunnel sections being excavated in different orientations to adapt to the extension of mud pipes in multiple sections. The mud pipe crane 3.7 is located above the mud pipe storage bracket 3.8, facilitating the hoisting of the mud pipes to be installed. The telescopic pipe 3.3 is fixed to the movable frame 3.2 by the first pipe clamp 3.4 and can move synchronously with the movable frame 3.2.

[0047] like Figure 13 As shown, the tunnel 2 includes a first section tunnel 2.1 and a second section tunnel 2.2 with opposite excavation directions. After the construction of the first section tunnel 2.1 is completed, the directions of the mud pipe storage support 3.8, the mud pipe crane 3.7, the telescopic pipe 3.3, and the movable hose 3.5 are changed to adapt to the construction of the second section tunnel 2.2. The mud pipe extension device 3 is adapted to the mud pipe support device 4 in the second tunnel 2.2 by reversing its direction at the origin. That is, by using the mud pipe extension device 3 as a fixed point and changing some of its upper mechanisms, the pipeline extension of the tunnel shield machine in different orientation sections of the starting shaft can be realized. This invention can also be applied to other similar construction situations such as double-tunnel four-section tunnels, as shown in the attached diagram. Figure 10 As shown.

[0048] like Figure 7As shown, in this embodiment, as a preferred solution, the traction mechanism includes a traction steel wire rope 4.5 connecting the support frame 4.3 in series. That is, the traction steel wire rope connects the support frame on the guide rail to the tunnel boring machine. The support frame 4.3 is provided with a guide wheel assembly 4.1 that cooperates with the guide rail 4.2. The guide wheel assembly and the guide rail cooperate to realize the movement of the support frame relative to the guide rail under the action of the tunnel boring machine. The support frame 4.3 is also provided with a second pipe clamp 4.4 for fixing the mud pipe 6. One end of the second pipe clamp is fixed to the mud pipe in the tunnel, and the other end is fixed to the support frame, so that the mud pipe moves forward as the equipment is excavated.

[0049] Example 3, as Figure 6 As shown, a slurry pipeline extension system for small-space, multi-section fixed-point slurry tunneling is further optimized based on Embodiment 1 or 2. To further ensure the stability of the support frame movement, the guide rail 4.2 includes two parallel upper and lower rails; the guide wheel assembly 4.1 includes an upper guide wheel assembly and a lower hanging wheel assembly mounted on the support frame 4.3. The upper guide wheel assembly cooperates with the upper rail, and the lower hanging wheel assembly cooperates with the lower rail. The traction steel wire rope 4.5 is divided into two parts and connected to the upper guide wheel assembly and the lower hanging wheel assembly respectively. During the tunnel boring machine construction process, the on-site personnel install the guide rails onto the tunnel wall according to the tunnel's direction. The engagement of the upper and lower guide wheels with the guide rails allows the support frame to advance along the tunnel curve. One end of the upper and lower traction steel wire ropes is connected to the tunnel boring machine structure, and the other end is connected and fixed to the upper and lower guide wheel wheel boxes, facilitating the uniform transmission of traction force to the support frame body. The sliding form of the slurry pipeline support device can also adopt rubber wheels or other guiding forms that can conform to the tunnel curvature.

[0050] like Figure 8As shown, since the mud pipes inside the tunnel are rigid pipes, a threaded flexible hose is added between the two rigid pipes to allow the mud pipes to adapt to turning conditions. Specifically, the mud pipe 6 includes a rigid mud pipe 6.1 and a corrugated mud hose 6.2. A corrugated mud hose is provided between two adjacent rigid mud pipes. The threaded hose in the middle is flexible and can adapt to the curvature of the tunnel when the pipeline needs to turn, thus allowing the mud pipe to adapt to turning conditions. The corrugated mud hose 6.2 includes a threaded hose 5.1. One end of the threaded hose 5.1 is connected to a front flange 5.2, and the other end is connected to a rear flange 5.6. An auxiliary tie rod 5.4 is connected between the front flange 5.2 and the rear flange 5.6. The two ends of the auxiliary tie rod 5.4 extend out of the front flange 5.2 and the rear flange 5.6 and are fixed by anti-loosening nuts 5.5. The front and rear flanges are connected to the front and rear rigid mud pipe flanges respectively via flange fasteners 5.3. The auxiliary tie rod is a combination of a screw rod and a lock nut. The auxiliary tie rod passes through the front and rear flanges and, together with the lock nut, limits the movement of the mud hose. The opening through which the tie rod passes through the front and rear flanges is a shaft-type interference fit, but this ensures that the lock nut will not pass through the opening. When the tunnel boring machine pulls the mud pipeline forward, the lock nut limits the traction force to the screw rod, preventing damage to the intermediate threaded hose. Simultaneously, during turns, due to the tunnel curvature, the screw rod and lock nut will not excessively constrain the mud pipeline, improving the applicability of the mud pipeline within the tunnel. To adapt the mud pipe to the tunnel curve radius, a threaded hose is connected between every two rigid mud pipes. Each time the pipeline extends, one rigid mud pipe and one corrugated mud hose are added, forming a complete mud pipe. The auxiliary tie rod in the threaded hose can take various forms, such as the screw rod and nut combination described in the article, or it can be achieved through welding limiters or any other means that meet the functional requirements.

[0051] Example 3: A construction method for the aforementioned slurry shield tunneling small-space multi-section fixed-point slurry pipeline extension system, such as... Figure 9 , 10 As shown, the steps are as follows:

[0052] S1: The mud pipe extension device 3 is assembled at the corresponding position in the launching shaft, and the mud pipe support device 4 is installed in place. By maximizing the use of the launching shaft space, the shield machine can meet the requirements of overall launching in an extremely short launching shaft. For ease of description, the mud pipe located in the tunnel is defined as the tunnel mud pipe, and the mud pipe located at the extension installation position between the mud pipe extension device 3 and the mud pipe support device 4 is defined as the installation position mud pipe. The first section of the guide rail is installed on the segments of the first section of tunnel 2.1, and the support frame 4.3 is installed on the first section of the guide rail. The support frame 4.3 is fixedly connected to the tunnel mud pipe. One end of the installation position mud pipe is connected to the telescopic pipe 3.3 on the mud pipe extension device 3, and the other end is connected to the tunnel mud pipe. The traction steel wire rope on the mud pipe support device 4 is connected to the shield machine along the tunneling direction.

[0053] S2: After the start, as the tunnel boring machine advances forward, the support frame 4.3 of the mud pipe support device is pulled forward on the first section of the guide rail by the traction steel wire rope, which at the same time drives the mud pipe in the tunnel, the mud pipe at the installation position, the movable frame 3.2 and the telescopic pipe 3.3 on the movable frame 3.2 to move forward.

[0054] S3: After the tunnel boring machine (TBM) moves the slurry pipe at the installation position forward by at least one slurry pipe distance, it enters the tunnel. That is, after the TBM moves the slurry pipe forward by at least L+D lengths, where L is the required extension length of the rigid pipe and D is the length of the flexible pipe. (See attached diagram.) Figure 6 As shown, close the mud gate valve on the mud pipe to stop the mud circulation in the pipe; install the new support frame 4.3 onto the guide rail and fix it to the mud pipe at the installation position inside the tunnel.

[0055] S4: Disconnect the connection between the corrugated mud hose of the installation position mud pipe and the telescopic pipe 3.3; and retract the telescopic pipe 3.3. Under the action of the motor winch 3.6, pull the movable frame 3.2 back to the initial position.

[0056] S5: The mud pipe to be installed is lifted from the mud pipe storage bracket by the mud pipe crane. The mud pipe to be installed is placed in the extension installation position between the mud pipe extension device 3 and the mud pipe support device 4 with the hard mud pipe facing forward. At this time, the mud pipe to be installed becomes the new installation position mud pipe. The hard mud pipe of the new installation position mud pipe is connected to the mud corrugated hose of the mud pipe in the tunnel. One side of the mud corrugated hose of the new installation position mud pipe is connected to the telescopic pipe 3.3. This completes one pipeline extension. After the extension is completed, the mud gate valve is opened and the equipment continues to excavate forward.

[0057] S6: Repeat steps S3 to S5 until the construction of the first tunnel section is completed.

[0058] S7: After the first section of tunnel excavation is completed, before excavating the second section, the equipment is stopped, and the connection between the slurry pipeline and the rigid flange of the slurry pipeline extension device is disconnected. The fixed frame, movable frame, and motor-driven winch remain stationary. The slurry pipe hoist, extension pipe storage bracket, movable hose, and telescopic pipe are installed in the opposite direction. Steps S1-S6 are repeated for the construction of the second section of the tunnel. Figure 11 , 12 As shown.

[0059] Compared with existing technologies, this invention reduces the total length of the trailer by arranging the mud pipeline extension device at the launching shaft, and fully utilizes tunnel space to meet the overall launching requirements of a very small launching shaft. Through a special design of the mud pipeline extension device, it ensures that the mud pipes are in the same direction in bidirectional tunneling sections without the need to build a new set of mud pipeline extension devices for mirroring. Furthermore, through a special design of the mud pipeline fixing device and the mud pipeline connection method, it enables the mud pipeline to move forward normally with the tunnel boring machine under conditions of small curvature. This invention improves the adaptability of tunnel boring machines in dealing with tunnels with small curvature, insufficient launching shaft space, and the need for overall launching.

[0060] 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.

Claims

1. A slurry pipeline extension system for small-space, multi-section fixed-point slurry tunneling, characterized in that: It includes a mud pipe extension device (3) installed at the wellhead of the starting shaft (1) and a mud pipe support device (4) laid in the tunnel (2); the mud pipe extension device (3) is installed at the initial end of the mud pipe support device (4), and the mud pipe support device (4) carries the mud pipe (6) and moves synchronously with the shield machine (5); the mud pipe extension device (3) is fixed at the position of the starting shaft (1) and can be adapted to the mud pipe support device (4) in the tunnel (2) in multiple directions to complete the extension of mud pipes in multiple sections; The mud pipe extension device (3) includes a fixed frame (3.1) and a movable frame (3.2) that can move along the fixed frame (3.1). A telescopic pipe (3.3) is fixedly provided on the movable frame (3.2). The telescopic pipe (3.3) can move synchronously with the movable frame (3.2). The telescopic pipe (3.3) is connected to a movable hose (3.5) provided on the fixed frame (3.1). The telescopic pipe (3.3) is detachably connected to the mud pipe (6). A motor-driven winch (3.6) is provided on the fixed frame (3.1). The motor-driven winch (3.6) is connected to the movable frame (3.2) and is used for resetting the movable frame (3.2). A mud pipe storage bracket (3.8) and a mud pipe hoist (3.7) are provided on one side of the fixed frame (3.1). The mud pipe hoist (3.7) is located above the mud pipe storage bracket (3.8). The tunnel (2) includes a first section tunnel (2.1) and a second tunnel (2.2) with opposite directions of excavation. After the first section tunnel (2.1) is completed, the mud pipeline extension device (3) is adapted to the mud pipeline support device (4) in the second tunnel (2.2) by changing the direction of origin. The mud pipe (6) includes a rigid mud pipe (6.1) and a corrugated mud hose (6.2), with a corrugated mud hose provided between two adjacent rigid mud pipes; The mud pipe support device (4) includes a guide rail (4.2) fixedly installed along the inner wall of the tunnel segment inside the tunnel (2). The guide rail (4.2) is laid in sections along the axial direction of the tunnel (2) following the shield machine. The guide rail (4.2) is provided with a support frame (4.3) that can move synchronously with the shield machine (5). The support frame (4.3) is fixed one-to-one with the mud pipe (6) inside the tunnel (2). The support frame (4.3) is connected to the shield machine (5) through a traction mechanism. The traction mechanism includes a traction steel wire rope (4.5) that connects the support frame (4.3) in series. The support frame (4.3) is provided with a guide wheel group (4.1) that cooperates with the guide rail (4.2).

2. The slurry pipeline extension system for small-space multi-section fixed-point slurry tunnels according to claim 1, characterized in that: The fixed frame (3.1) is provided with a first slide rail arranged along the axial direction, and the movable frame (3.2) is provided with a pulley group that cooperates with the first slide rail.

3. The slurry pipeline extension system for small-space multi-section fixed-point slurry tunnels according to claim 2, characterized in that: The telescopic tube (3.3) is fixed to the movable frame (3.2) by the first tube clamp (3.4) and can move synchronously with the movable frame (3.2).

4. The slurry pipeline extension system for small-space multi-section fixed-point slurry tunneling as described in claim 3, characterized in that: After the first section tunnel (2.1) is completed, the direction of the mud pipe storage bracket (3.8), mud pipe crane (3.7), telescopic pipe (3.3) and movable hose (3.5) is changed to adapt to the construction of the second tunnel (2.2). The mud pipe extension device (3) is adapted to the mud pipe support device (4) in the second tunnel (2.2) by changing the origin direction.

5. The slurry pipeline extension system for small-space multi-section fixed-point slurry tunnels according to any one of claims 1 to 4, characterized in that: The support frame (4.3) is also equipped with a second pipe clamp (4.4) for fixing the mud pipe (6).

6. The slurry pipeline extension system for small-space multi-section fixed-point slurry tunneling as described in claim 5, characterized in that: The guide rail (4.2) includes two parallel upper rails and a lower rail; the guide wheel assembly (4.1) includes an upper guide wheel assembly and a lower hanging wheel assembly set on the support frame (4.3). The upper guide wheel assembly cooperates with the upper rail, and the lower hanging wheel assembly cooperates with the lower rail. The traction steel wire rope (4.5) is divided into two parts and connected to the upper guide wheel assembly and the lower hanging wheel assembly respectively.

7. The slurry pipeline extension system for small-space multi-section fixed-point slurry tunneling according to claim 1 or 6, characterized in that: The slurry corrugated hose (6.2) includes a threaded hose (5.1), one end of which is connected to a front flange (5.2) and the other end is connected to a rear flange (5.6). An auxiliary tie rod (5.4) is connected between the front flange (5.2) and the rear flange (5.6). Both ends of the auxiliary tie rod (5.4) extend out of the front flange (5.2) and the rear flange (5.6) and are fixed by anti-loosening nuts (5.5).

8. A construction method for a slurry pipeline extension system for small-space multi-section fixed-point slurry tunneling as described in claim 7, characterized in that: The steps are as follows: S1: The mud pipeline extension device (3) is assembled at the corresponding position in the starting shaft, and the mud pipeline support device (4) is installed in place. The mud pipe located in the tunnel is defined as the tunnel mud pipe, and the mud pipe located at the extension installation position between the mud pipeline extension device (3) and the mud pipeline support device (4) is defined as the installation position mud pipe. The first section of the guide rail is installed on the segment of the first section of the tunnel (2.1), and the support frame (4.3) is installed on the first section of the guide rail. The support frame (4.3) is fixedly connected to the tunnel mud pipe. One end of the installation position mud pipe is connected to the telescopic pipe (3.3) on the mud pipeline extension device (3), and the other end is connected to the tunnel mud pipe. The traction steel wire rope on the mud pipeline support device (4) is connected to the shield machine along the tunneling direction. S2: After the start, as the tunnel boring machine advances forward, the support frame (4.3) of the mud pipe support device is pulled forward on the first guide rail by the traction steel wire rope, which at the same time drives the mud pipe in the tunnel, the mud pipe at the installation position, the movable frame (3.2) and the telescopic pipe (3.3) on the movable frame (3.2) to move forward. S3: When the tunnel boring machine moves the installation position mud pipe forward by at least one mud pipe distance and enters the tunnel, close the mud gate valve on the mud pipe to stop the mud circulation in the pipe; install the new support frame (4.3) on the guide rail and fix it to the installation position mud pipe located in the tunnel; S4: Disconnect the connection between the corrugated hose of the mud pipe at the installation position and the telescopic pipe (3.3); and retract the telescopic pipe (3.3), and under the action of the motor winch (3.6), pull the movable frame (3.2) back to the initial position; S5: The mud pipe to be installed is lifted from the mud pipe storage bracket by the mud pipe crane. The mud pipe to be installed is placed in the extension installation position between the mud pipe extension device (3) and the mud pipe support device (4) with the mud hard pipe facing forward. At this time, the mud pipe to be installed becomes the new installation position mud pipe. The mud hard pipe of the new installation position mud pipe is connected to the mud corrugated hose of the mud pipe in the tunnel. One side of the mud corrugated hose of the new installation position mud pipe is connected to the telescopic pipe (3.3). This completes one pipeline extension. After the extension is completed, the mud gate valve is opened and the equipment is excavated forward again. S6: Repeat steps S3 to S5 until the construction of the first tunnel section is completed; S7: After the first section of the tunnel is excavated, before the second section of the tunnel is excavated, the equipment is stopped, and the mud pipe crane, extension pipe storage bracket, movable hose, and telescopic pipe are installed in the opposite direction. Repeat steps S1 to S6 to carry out the construction of the second section of the tunnel.

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