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

Abstract

The invention discloses a slurry shield small-space multi-interval fixed-point slurry pipeline extension system and a construction method, and solves the problems that the existing tunnel construction curvature is small, the space of a starting well is insufficient, the slurry pipeline is difficult to extend under the condition that integral starting is needed, and the requirement that the slurry pipeline is located on the same side under multiple construction intervals is not met. The mud pipeline extending system comprises a mud pipeline extending device arranged at a wellhead of a starting well and a mud pipeline supporting device laid in a tunneling tunnel. The slurry pipeline extending device is arranged at the initial end of the slurry pipeline supporting device, and the slurry pipeline supporting device bears a slurry pipe to synchronously move along with the shield tunneling machine. The slurry pipeline supporting device can be matched with the slurry pipeline extending devices in the tunneling tunnel in multiple directions to complete multi-interval slurry pipeline extension with the position of the starting well as the center of a fixed point. The mud pipeline extending device is arranged at the starting well mouth, the total length of a trailer is reduced, and the overall starting requirement of the extremely small starting well is met by fully utilizing the tunnel space.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to a slurry shield pipeline extension system. Background Art

[0002] During tunnel construction, shield machine launches are generally divided into overall launches and split launches. Due to the rapid development of urban underground space, the requirements for sites are extremely stringent. Therefore, shield machine launches often encounter insufficient construction site space, making overall launch of shield machines more and more difficult, while split launches will affect construction period and cost. Especially in the field of slurry shield construction, the demand for sites is even greater. If the launch shaft is extremely small and the construction wants to start as a whole, it is often difficult to achieve.

[0003] In the prior art, for example, a slurry pipeline extension device and an extension method for a slurry shield are disclosed in a patent with publication number CN 110985036 A. This technology requires that the slurry pipeline extension device be arranged on a trailer, which results in a trailer structure that is too long and cannot meet the construction requirements of a small space and overall starting, and is only suitable for slurry shields with extra-large diameters. In addition, the slurry extension device can only be used for pipeline extension in one-way tunnel construction. If the starting shaft is located in the middle of the tunnel and two-way section construction is required, the requirement that the slurry pipelines are on the same side cannot be met. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a mud shield small space multi-interval fixed-point mud pipeline extension system and construction method, which solves the problems in the prior art that the mud pipeline is difficult to extend when the tunnel construction curvature is small, the starting well space is insufficient and the overall starting is required, and it is not suitable for the requirement that the mud pipelines are on the same side in multiple construction intervals.

[0005] The technical solution of the present invention is achieved as follows: a slurry shield small space multi-interval fixed-point mud pipeline extension system, including a mud pipeline extension device arranged at the wellhead of the starting well and a mud pipeline support device laid in the excavation tunnel; the mud pipeline extension device is arranged at the initial end of the mud pipeline support device, and the mud pipeline support device carries the mud pipe and moves synchronously with the shield machine; the mud pipeline support device takes the position of the starting well as the fixed-point center, and can respectively adapt to the mud pipeline extension devices in the excavation tunnel in multiple directions to complete the multi-interval mud pipeline extension.

[0006] Further preferably, the mud pipeline extension device includes a fixed frame and a movable frame that can move along the fixed frame, the movable frame is fixedly provided with a telescopic tube, the telescopic tube is connected to a movable hose arranged on the fixed frame; the telescopic tube and the mud pipe are detachably connected; the telescopic tube and the mud pipe serve as the docking point of the extension pipeline, which facilitates the rapid insertion and extension docking of the mud pipe.

[0007] Further preferably, the fixed frame is provided with a first slide rail arranged axially, the movable frame is provided with a pulley block matching the first slide rail, the fixed frame is provided with a motor winch, the motor winch is connected to the movable frame, and is used for resetting the movable frame.

[0008] Further preferably, a mud pipe storage bracket and a mud pipe crane are provided on one side of the fixed frame, and the mud pipe crane is 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 preferably, the excavation tunnel includes a first section tunnel and a second section tunnel in opposite directions of excavation. After the construction of the first section tunnel is completed, the directions of the mud pipe storage bracket, the mud pipe crane, the telescopic pipe and the movable hose are changed to adapt to the construction of the second excavation tunnel, and the mud pipeline extension device is adapted to the mud pipeline support device in the second excavation tunnel by reversing the origin.

[0010] Further preferably, the mud pipeline supporting device includes a guide rail fixedly arranged along the inner wall of the pipe segment in the tunnel, and the guide rail is laid in sections in sequence along the axial direction of the tunnel following the shield machine; a support frame that can move synchronously with the shield machine is provided on the guide rail, the support frame is fixed one-to-one with the mud pipe in the tunnel, and the support frame is connected to the shield machine through a traction mechanism.

[0011] Further preferably, the traction mechanism comprises a traction wire rope connected in series with a support frame, the support frame is provided with a guide wheel group cooperating with the guide rail, and the support frame is also provided with a second pipe clamp for fixing the mud pipe.

[0012] Further preferably, the guide rail includes two upper rails and two lower rails arranged in parallel; the guide wheel group includes an upper guide wheel group and a lower hanging wheel group arranged on the support frame, the upper guide wheel group cooperates with the upper rail, and the lower hanging wheel group cooperates with the lower rail, and the traction wire rope is divided into two and is respectively connected to the upper guide wheel group and the lower hanging wheel group.

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

[0014] A construction method of a slurry shield small space multi-interval fixed-point slurry pipeline extension system, the steps are as follows: S1: The mud pipeline extension device is assembled at the corresponding position of the starting well, and the mud pipeline support device is installed in place. The mud pipe located in the tunnel is defined as the in-tunnel mud pipe, and the mud pipe located at the extended 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 the guide rail is installed on the pipe segment of the first section tunnel, and the support frame is installed on the first section of the guide rail. The support frame is fixedly connected to the in-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 in-tunnel mud pipe, and the traction wire rope on the mud pipeline support device is connected to the shield machine along the excavation direction; S2: After starting, as the shield machine moves forward, the traction wire rope pulls the support frame of the mud pipeline support device forward on the first section of the guide rail, and at the same time drives the mud pipe in the hole, the mud pipe at the installation position, the movable frame and the telescopic pipe on the movable frame to move forward; S3: When the shield machine drives the installation mud pipe forward by at least one mud pipe distance and enters the tunnel, the mud gate valve on the mud pipe is closed to stop the mud circulation in the pipe; the new support frame is installed on the guide rail and fixed to the installation mud pipe in the tunnel; S4: disconnect the connection between the mud corrugated hose and the telescopic tube of the mud pipe at the installation position; retract the telescopic tube, and pull the movable frame back to the initial position under the action of the motor winch; S5: The mud pipe to be installed is lifted from the mud pipe storage bracket by a mud pipe crane, and the mud pipe to be installed is placed at the extension installation position between the mud pipe extension device and the mud pipe support device 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 hole, and one side of the mud corrugated hose of the new installation position mud pipe is connected to the telescopic pipe; thus, one pipeline extension is completed, and 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 first section tunnel construction is completed; S7: After the tunneling of the first section is completed and before the tunneling of the second section needs to be excavated, the equipment is stopped, the mud pipe crane, the extension pipe storage bracket, the movable hose, and the telescopic pipe are installed in the opposite direction, and steps S1 to S6 are repeated to construct the tunnel of the second section.

[0015] The beneficial effects of the present invention are as follows: compared with the prior art, 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 a very small starting well by making full use of the tunnel space.

[0016] Through the reversible design of the mud pipe extension device fixing frame, movable frame and extension pipe storage bracket, the two-way excavation section does not need to mirror a new set of mud pipe extension devices to ensure that the mud pipe is in the same direction, so as to achieve multi-section fixed-point mud pipe extension construction under the same set of equipment, simplify the construction process and improve construction efficiency. In addition, when the shield machine reverses the excavation, only by adjusting the mud pipe extension device, the requirement that the mud pipe is on the same side during construction on both sides can be met. By specially designing the connection form between the mud pipe support device and the mud pipe, the problem of mud pipe support and adaptability in the tunnel during excavation with a small turning radius is solved.

[0017] Through the special design of mud hard pipe and mud corrugated hose for the mud pipeline, the middle threaded hose is flexible and can adapt to the curvature of the tunnel when the pipeline needs to turn, so that the mud pipe can adapt to the turning conditions and achieve the purpose of the mud pipeline moving forward normally with the shield machine under small curvature construction conditions.

[0018] In summary, the present invention improves the adaptability of the shield machine in coping with tunnel construction with small curvature, insufficient space in the starting shaft and the need for overall starting; it improves the flexibility and construction efficiency of slurry shield construction, and has outstanding progress and advantages in small-space slurry shield construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the front view of the mud pipeline extension device of the present invention; Figure 3 for Figure 2 Middle K-direction view; Figure 4 A top view schematic diagram of the invented mud pipeline extension device; Figure 5 It is a schematic diagram of the front view of the mud pipeline support device of the present invention; Figure 6 for Figure 5 Middle HH view; Figure 7 It is a top view schematic diagram of the mud pipeline support device of the present invention; Figure 8 This is a schematic diagram of the structure of the mud corrugated hose; Fig. 9 This is a schematic diagram of the initial state of the slurry shield in the first section tunnel; Fig.10 This is a schematic diagram of the extended slurry pipe status of the slurry shield in the first section tunnel; Fig.11 This is a schematic diagram of the mud pipeline extension device before the construction of the second section tunnel; Fig.12 This is a schematic diagram of the starting state of the slurry shield in the second section tunnel; Fig.13 It is a schematic diagram of two section tunnels; Fig.14 This is a schematic diagram of the four section tunnels. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1, as Figure 1 As shown, a slurry shield small space multi-interval fixed-point mud pipeline extension system includes a mud pipeline extension device 3 arranged at the wellhead of the starting well 1 and a mud pipeline support device 4 laid in the excavation tunnel 2; by placing the mud pipeline extension device at the wellhead of the starting well, the mud pipeline support device is pulled by the power of the shield machine when it moves forward, thereby driving the mud pipeline forward, minimizing the overall length of the trailer, and meeting the requirements of the overall starting of the extremely small starting well. The mud pipeline extension device 3 is arranged on one side of the initial end of the mud pipeline support device 4; the mud pipeline extension device 3 and the initial position of the mud pipeline support device 4 form an extension installation position for the mud pipe. The mud pipeline support device 4 carries the mud pipe 6 and moves synchronously with the shield machine 5; the mud pipeline support device 4 takes the position of the starting well 1 as the fixed point center, and can respectively adapt to the mud pipeline extension devices 3 in the excavation tunnel 2 in multiple directions to complete the multi-interval mud pipeline extension. The mud pipeline extension device is fixedly arranged at the starting wellhead, and the starting well is located in the middle of the line. The mud pipeline extension device does not need to be mirrored to ensure that the mud pipe is located on the same side when construction is carried out on both sides.

[0023] like Figure 2As shown, in this embodiment, the mud pipeline extension device 3 preferably 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 use requirements in two directions, and the movable frame moves on the support frame through a sliding member, and moves forward with the shield machine driven by the mud pipe. A telescopic tube 3.3 is fixed on the movable frame 3.2, and the telescopic tube 3.3 is connected to a movable hose 3.5 set on the fixed frame 3.1; in the tunnel, the mud pipe drives the movable frame to move relative to the fixed frame under the action of the shield machine, and drives the telescopic tube to move synchronously. The telescopic tube 3.3 is detachably connected to the mud pipe 6 to ensure that the mud pipe to be installed can be smoothly extended and installed between the telescopic tube and the mud pipe in the tunnel, so as to realize the step-by-step continuous extension installation of the mud pipe.

[0024] like Figure 5 As shown, the mud pipeline support device 4 described in this embodiment includes a guide rail 4.2 fixedly arranged along the inner wall of the pipe segment in the tunnel 2. The guide rail 4.2 is laid in sections in sequence along the axial direction of the tunnel 2 following the shield machine, that is, the guide rail follows the tunneling machine for step-by-step assembly. 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 in the tunnel 2; multiple support frames can be arranged on the guide rail according to the number of mud pipes. In this embodiment, one support frame corresponds to one mud pipe in the tunnel. The support frame 4.3 is connected to the shield machine 5 through a traction mechanism. During the tunneling of the shield machine, the traction mechanism drives the support frame to move along the guide rail to ensure the stable forward movement of the mud pipe in the tunnel. This structural design greatly reduces the overall length of the rear supporting trailer and meets the requirements of overall starting in an extremely short starting shaft.

[0025] Embodiment 2, as Figure 3 , 4 As shown, a slurry shield small space multi-interval fixed-point mud pipeline extension system is further preferred based on Example 1. The specific structure of the movable frame moving along the fixed frame is as follows: the fixed frame 3.1 is provided with a first slide rail 3.9 arranged along the axial direction. The number of the first slide rails can be 1 or more as required. In this embodiment, 1 is taken as an example. The movable frame 3.2 is provided with a pulley group 3.10 matched with the first slide rail 3.9. The pulley group can adopt 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 winch 3.6. The steel wire rope of the motor 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 shield machine, when the mud pipe extension needs to be installed, the connection between the telescopic pipe and the mud pipe is disconnected, and the telescopic pipe is fixed to the movable frame by a pipe clamp, and is reset under the traction of the driving motor through the wire rope. The mud pipe crane can transport the mud pipe that needs to be extended from the mud pipe storage bracket.

[0026] In this embodiment, 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 storage bracket 3.8 is used to store the mud pipe to be installed. According to the interval excavation tunnels in different directions, its installation position is changed to adapt to the extension of multiple interval mud pipelines. The mud pipe hoist 3.7 is located above the mud pipe storage bracket 3.8 to facilitate the lifting of the mud pipe to be installed. The telescopic pipe 3.3 is fixed to the movable frame 3.2 through the first pipe clamp 3.4 and can move synchronously with the movable frame 3.2.

[0027] like Fig.13 As shown, the excavation tunnel 2 includes a first interval tunnel 2.1 and a second interval tunnel 2.2 in opposite directions of the excavation direction. After the construction of the first interval tunnel 2.1 is completed, the directions of the mud pipe storage bracket 3.8, the mud pipe hoist 3.7, the telescopic pipe 3.3 and the movable hose 3.5 are changed to adapt to the construction of the second interval tunnel 2.2. The mud pipeline extension device 3 adapts to the mud pipeline support device 4 in the second excavation tunnel 2.2 in the way of reversing the origin; that is, the mud pipeline extension device 3 is used as a fixed point, and part of its upper mechanism is changed to realize the pipeline extension of the tunnel shield machine in different azimuth intervals of the starting shaft. The present invention can also be applied to other similar construction situations such as double-hole four-interval according to the usage situation, as shown in the attached Fig.10 shown.

[0028] like Figure 7 As shown, in this embodiment, as a preferred solution, the traction mechanism includes a traction wire rope 4.5 of a series support frame 4.3, that is, the traction wire rope connects the support frame on the guide rail to the shield machine, and the support frame 4.3 is provided with a guide wheel group 4.1 that cooperates with the guide rail 4.2. The guide wheel group and the guide rail cooperate with each other under the action of the shield machine to realize the movement of the support frame relative to the guide rail. 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 fixes the mud hard pipe in the tunnel, and the other end is fixed to the support frame, so that the mud hard pipe finally moves forward with the excavation of the equipment.

[0029] Embodiment 3, as Figure 6As shown, a slurry shield small space multi-interval fixed-point mud pipeline extension system, based on embodiment 1 or 2, this embodiment is further preferred. 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 group 4.1 includes an upper guide wheel group and a lower hanging wheel group arranged on the support frame 4.3, the upper guide wheel group cooperates with the upper track, the lower hanging wheel group cooperates with the lower track, and the traction wire rope 4.5 is divided into two and connected to the upper guide wheel group and the lower hanging wheel group respectively. During the construction of the shield machine, the on-site personnel install the guide rail on the tunnel wall according to the direction of the construction tunnel, and the upper and lower guide wheels are engaged with the guide rail so that the support frame moves along the tunnel curve. One end of the upper and lower traction wire ropes is connected to the shield machine structure, and the other end is connected and fixed to the upper and lower guide wheel boxes, so as to facilitate the uniform transmission of traction to the support frame body. The sliding form of the mud pipeline support device can also adopt a series of other guiding forms such as rubber wheels that can fit the curvature of the tunnel.

[0030] like Figure 8 As shown, since the mud pipeline in the tunnel is a hard pipe, in order to make the mud pipe pulled forward adapt to the turning condition, a threaded hose is added between the two hard pipes. Specifically, the mud pipe 6 includes a mud hard pipe 6.1 and a mud corrugated hose 6.2. A mud corrugated hose is provided between two adjacent mud hard pipes. The middle threaded hose is flexible and can adapt to the curvature of the tunnel when the pipeline needs to turn, so that the mud pipe can adapt to the turning condition. The mud corrugated 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 pull rod 5.4 is connected between the front flange 5.2 and the rear flange 5.6. The two ends of the auxiliary pull rod 5.4 extend out of the front flange 5.2 and the rear flange 5.6 and are fixed by a lock nut 5.5. The front and rear flanges are respectively connected to the front and rear mud pipe flanges through flange fixings 5.3; the auxiliary pull rod is a combination of a screw and a lock nut, which passes through the front and rear flanges and cooperates with the lock nut to limit the mud hose. The openings of the pull rod passing through the front and rear flanges are a base shaft interference fit, but the lock nut is guaranteed not to pass through the opening. When the shield machine pulls the mud pipeline forward, the lock nut is limited so that the traction force acts on the screw without damaging the middle threaded hose. At the same time, when turning, due to the influence of the curvature of the tunnel, the screw and the lock nut will not over-constrain the mud pipeline, thereby improving the applicability of the mud pipeline in the tunnel. In order to make the mud pipe adapt to the radius of the tunnel curve, a threaded hose is connected between every two mud pipes. Each time the pipeline is extended, a mud pipe and a mud corrugated hose are added to form a mud pipe. The auxiliary pull rod in the threaded hose has various forms, which can be a combination of a screw and a nut as described in the article, or can be welded by any means that can meet the function, such as a limiter.

[0031] Embodiment 3, a construction method of a slurry shield small space multi-interval fixed-point slurry pipeline extension system, such as Fig. 9 , 10 As shown, the steps are as follows: S1: The mud pipeline extension device 3 is assembled at the corresponding position of the starting shaft, and the mud pipeline support device 4 is installed in place. By maximizing the use of the starting shaft space, it is ensured that the shield machine can meet the requirements of overall starting in an extremely short starting shaft; for the convenience of description, the mud pipe located in the tunnel is defined as the in-tunnel mud pipe, and the mud pipe located at the extended installation position between the mud pipeline 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 pipe segment of the first interval 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 in-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 in-tunnel mud pipe, and the traction wire rope on the mud pipeline support device 4 is connected to the shield machine along the excavation direction.

[0032] S2: After starting, as the shield machine advances forward, the support frame 4.3 of the mud pipeline support device is pulled forward on the first section of the guide rail by the traction wire rope, and at the same time, the mud pipe in the hole, the mud pipe at the installation position, the movable frame 3.2 and the telescopic pipe 3.3 on the movable frame 3.2 are driven forward.

[0033] S3: When the shield machine drives the installed mud pipe forward to move at least the distance of a mud pipe, it enters the tunnel, that is, when the shield machine drives the mud pipe forward to move at least the length of L+D, where L is the length of the hard pipe to be extended, and D is the length of the soft pipe, as shown in the attached figure. Figure 6 As shown, the mud gate valve on the mud pipeline is closed to stop the mud circulation in the pipeline; a new support frame 4.3 is installed on the guide rail and fixed to the mud pipe at the installation position in the tunnel.

[0034] S4: disconnect the connection between the mud corrugated hose of the mud pipe installed at the installation position and the telescopic tube 3.3; retract the telescopic tube 3.3, and under the action of the motor winch 3.6, pull the movable frame 3.2 back to the initial position.

[0035] S5: The mud pipe to be installed is lifted from the mud pipe storage bracket by a mud pipe crane, and 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 hole, and one side of the mud corrugated hose of the new installation position mud pipe is connected to the telescopic pipe 3.3; thus, a pipeline extension is completed. After the extension is completed, the mud gate valve is opened, and the equipment advances forward again.

[0036] S6: Repeat steps S3 to S5 until the first section tunnel construction is completed.

[0037] S7: After the tunneling of the first section is completed, before the tunneling of the second section is required, the equipment is stopped, the hard pipe flange connection between the mud pipeline in the tunnel and the mud pipeline extension device is disconnected, the fixed frame, the movable frame, and the motor winch are kept stationary, the mud pipe hoist, the extension pipe storage bracket, the movable hose, the telescopic pipe, etc. are installed in the opposite direction, and steps S1 to S6 are repeated to construct the second section tunnel; Fig.11 , 12 shown.

[0038] Compared with the existing technology, the present invention arranges the mud pipeline extension device at the starting wellhead to reduce the total length of the trailer, and fully utilizes the tunnel space to meet the overall starting requirements of the extremely small starting well; through the special design of the mud pipeline extension device, it is possible to achieve the purpose of ensuring that the mud pipes are in the same direction without mirroring a new set of mud pipeline extension devices in the two-way excavation interval; through the special design of the mud pipeline fixing device and the mud pipeline connection form, the purpose of the mud pipeline being able to move forward normally with the shield machine under the construction condition of small curvature is achieved. The present invention improves the adaptability of the shield machine in dealing with the small curvature of the excavation tunnel construction, insufficient starting well space and the need for overall starting.

[0039] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A slurry shield small space multi-interval fixed-point slurry pipeline extension system, characterized by: The invention comprises a mud pipeline extension device (3) arranged at the wellhead of a starting well (1) and a mud pipeline support device (4) laid in an excavation tunnel (2); the mud pipeline extension device (3) is arranged at the initial end of the mud pipeline support device (4), and the mud pipeline support device (4) carries a mud pipe (6) and moves synchronously with a shield machine (5); the mud pipeline support device (4) takes the position of the starting well (1) as a fixed point center, and can respectively adapt to the mud pipeline extension devices (3) in the excavation tunnel (2) in multiple directions to complete the extension of the mud pipeline in multiple intervals.

2. The slurry shield small space multi-interval fixed-point slurry pipeline extension system according to claim 1 is characterized by: The mud pipeline extension device (3) comprises a fixed frame (3.1) and a movable frame (3.2) movable along the fixed frame (3.1); a telescopic tube (3.3) is fixedly provided on the movable frame (3.2); the telescopic tube (3.3) is connected to a movable hose (3.5) provided on the fixed frame (3.1); and the telescopic tube (3.3) is detachably connected to the mud pipe (6).

3. The slurry shield small space multi-interval fixed-point slurry pipeline extension system according to claim 2 is characterized by: The fixed frame (3.1) is provided with a first slide rail (3.9) arranged along the axial direction, the movable frame (3.2) is provided with a pulley block (3.10) matched with the first slide rail (3.9), and the fixed frame (3.1) is provided with a motor-type hoist (3.6), which is connected to the movable frame (3.2) and is used for resetting the movable frame (3.2).

4. The slurry shield small space multi-interval fixed-point slurry pipeline extension system according to claim 3 is characterized by: A mud pipe storage bracket (3.8) and a mud pipe crane (3.7) are provided on one side of the fixed frame (3.1), and the mud pipe crane (3.7) is located above the mud pipe storage bracket (3.8); the telescopic pipe (3.3) is fixed to the movable frame (3.2) by a first pipe clamp (3.4) and can move synchronously with the movable frame (3.2).

5. The slurry shield small space multi-interval fixed-point slurry pipeline extension system according to claim 4 is characterized by: The excavation tunnel (2) comprises a first section tunnel (2.1) and a second section tunnel (2.2) in opposite directions of the excavation direction. 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 excavation tunnel (2.2), and the mud pipeline extension device (3) is adapted to the mud pipeline support device (4) in the second excavation tunnel (2.2) in an origin reversing manner.

6. The slurry shield small space multi-interval fixed-point slurry pipeline extension system according to any one of claims 1 to 5, characterized in that: The mud pipeline support device (4) comprises a guide rail (4.2) fixedly arranged along the inner wall of a pipe segment in an excavation tunnel (2), the guide rail (4.2) being laid in sections in sequence along the axial direction of the excavation tunnel (2) following the shield machine; a support frame (4.3) capable of moving synchronously with the shield machine (5) is provided on the guide rail (4.2), the support frame (4.3) being fixedly arranged in one-to-one correspondence with the mud pipe (6) in the excavation tunnel (2), and the support frame (4.3) being connected to the shield machine (5) via a traction mechanism.

7. The slurry shield small space multi-interval fixed-point slurry pipeline extension system according to claim 6 is characterized by: The traction mechanism comprises a traction steel wire rope (4.5) connected in series with a support frame (4.3); the support frame (4.3) is provided with a guide wheel group (4.1) matched with the guide rail (4.2); and the support frame (4.3) is also provided with a second pipe clamp (4.4) for fixing the mud pipe (6).

8. The slurry shield small space multi-interval fixed-point slurry pipeline extension system according to claim 7 is characterized by: The guide rail (4.2) comprises an upper rail and a lower rail which are arranged in parallel; the guide wheel group (4.1) comprises an upper guide wheel group and a lower suspension wheel group which are arranged on a support frame (4.3); the upper guide wheel group cooperates with the upper rail, and the lower suspension wheel group cooperates with the lower rail; and the traction wire rope (4.5) is divided into two and is respectively connected to the upper guide wheel group and the lower suspension wheel group.

9. The slurry shield small space multi-interval fixed-point slurry pipeline extension system according to claim 1 or 8, characterized in that: The mud pipe (6) comprises a mud hard pipe (6.1) and a mud corrugated hose (6.2), and a mud corrugated hose is provided between two adjacent mud hard pipes; The mud corrugated hose (6.2) comprises 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 pull rod (5.4) is connected between the front flange (5.2) and the rear flange (5.6), and both ends of the auxiliary pull 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).

10. A construction method for a slurry shield small space multi-interval fixed-point slurry pipeline extension system as claimed in claim 9, characterized in that: Here are the steps: S1: The mud pipe extension device (3) is assembled at the corresponding position of the starting well, and the mud pipe support device (4) is installed in place. The mud pipe located in the tunnel is defined as the in-tunnel mud pipe, and the mud pipe located at the extended 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 pipe segment of the first section 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 in-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 in-tunnel mud pipe, and the traction wire rope on the mud pipe support device (4) is connected to the shield machine along the excavation direction; S2: After starting, as the shield machine advances forward, the support frame (4.3) of the mud pipeline support device is pulled forward on the first section of the guide rail by the traction wire rope, and at the same time, the mud pipe in the hole, the mud pipe at the installation position, the movable frame (3.2) and the telescopic pipe (3.3) on the movable frame (3.2) are driven forward; S3: When the shield machine drives the installation mud pipe to move forward at least the distance of the mud pipe and enters the tunnel, the mud gate valve on the mud pipe is closed to stop the mud circulation in the pipe; the new support frame (4.3) is installed on the guide rail and fixed to the installation mud pipe located in the tunnel; S4: disconnecting the connection between the mud corrugated hose of the mud pipe at the installation position and the telescopic tube (3.3); retracting the telescopic tube (3.3), and pulling the movable frame (3.2) back to the initial position under the action of the motor winch (3.6); S5: The mud pipe to be installed is lifted from the mud pipe storage bracket by a mud pipe crane, and 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 hole, and one side of the mud corrugated hose of the new installation position mud pipe is connected to the telescopic pipe (3.3); thus, one pipeline extension is completed. After the extension is completed, the mud gate valve is opened, and the equipment resumes forward excavation; S6: Repeat steps S3 to S5 until the first section tunnel construction is completed; S7: After the tunneling of the first section is completed and before the tunneling of the second section needs to be excavated, the equipment is stopped, the mud pipe crane, the extension pipe storage bracket, the movable hose, and the telescopic pipe are installed in the opposite direction, and steps S1 to S6 are repeated to construct the tunnel of the second section.

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