Ultra-small clear distance large shield jumbo and using method

Abstract

This invention belongs to the field of tunnel boring machine (TBM) trolley technology, providing an ultra-small clearance large TBM trolley and its usage method. The trolley includes a gantry system, a support system, and a traveling system. The gantry system includes at least one gantry module, each gantry module comprising at least one steel frame. The support system includes several support modules, each steel frame being paired with one support module. Each support module includes multiple support components. Each support component includes a support member and a support drive source. The traveling system includes a track and several traveling mechanisms. Each traveling mechanism corresponds to each gantry module, and the gantry module is mounted on the traveling mechanism. Each traveling mechanism includes a slider adapted to the track and a traveling drive source. This invention has a high degree of automation, can uniformly and reliably support the tunnel segments, and effectively improves efficiency and support effect.

Description

Technical Field

[0001] This invention belongs to the field of tunnel boring machine (TBM) trolley technology, specifically relating to an ultra-small clearance large TBM trolley and its usage method. Background Technology

[0002] In urban underground space development, due to limitations imposed by existing buildings, complex geological conditions, and planning requirements, twin-track shield tunnels often need to be constructed in parallel with extremely small clearances. For example, in projects such as subway interchanges, river-crossing tunnels, and underground utility tunnels, the clearance between twin-track tunnels is typically controlled within the range of 0.2D-0.3D. However, during the excavation of the subsequent tunnel, the release of surrounding rock stress and ground disturbance significantly affect the stress state of the preceding tunnel segments, leading to problems such as segment misalignment, joint leakage, and excessive ellipticity. According to industry statistics, when the clearance is less than 0.5D, the convergence deformation of the preceding tunnel segments can reach 1.5-2 times the design value, and the proportion of misalignment exceeding 5mm is as high as 35%, seriously threatening the structural safety and operational life of the tunnel.

[0003] In existing technologies, segment deformation control for tunnels with extremely small clearances mainly relies on passive temporary support reinforcement: mechanically reinforcing the preceding tunnel using circumferential steel supports or diagonal steel pipe braces. However, this method requires manual installation after the tunnel boring machine (TBM) has stopped, with each ring support taking 4-6 hours. Furthermore, the uneven distribution of support force can easily lead to excessive local compressive stress in the segments (measured values ​​reached 3.5 MPa, exceeding the design value by 120%). Moreover, traditional support structures struggle to adapt to changes in tunnel curvature, and installation errors can easily result in increased support void ratios, weakening the reinforcement effect. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a large shield tunneling trolley with ultra-small clearance. This trolley has a high degree of automation and can provide uniform and reliable support for the tunnel segments, effectively improving efficiency and support effect.

[0005] The technical solution adopted by this invention to solve its technical problem is: A large shield tunneling trolley with ultra-small clearance includes a gantry system, a support system, and a traveling system; The gantry system includes at least one gantry module, each gantry module includes at least one steel frame, and the steel frames of the same gantry module are arranged sequentially and adjacent steel frames are connected to each other. The support system includes several support modules, and each steel frame is equipped with one support module; each support module includes multiple support components, which are evenly distributed on the steel frame at a specified angle and support the tunnel segments to form a fan-shaped support area; each support component includes a support member and a support drive source for driving the support member to extend and retract. The walking system includes a track and several walking mechanisms; the track is located at the bottom of the tunnel, each walking mechanism corresponds to each gantry module and the gantry module is mounted on the walking mechanism; the walking mechanism includes a slider adapted to the track and a walking drive source for driving the gantry module to move along the track.

[0006] In a preferred embodiment of the present invention, the steel frame is arched and includes two base frames, two side frames, and a top frame; the two base frames are mounted on the traveling mechanism, the two side frames are respectively mounted on top of the two base frames, and the top frame is located between the two side frames; the support components are provided on the side of the base frames, the side frames, and the top frame facing the tube segment.

[0007] Preferably, the base frame, the side frame, and the top frame are provided with connecting parts at both ends; the connecting parts have a flanged structure and are provided with multiple connecting holes; the connecting parts between the base frame and the side frame, and between the side frame and the top frame, are mated and locked and fixed by locking members.

[0008] Preferably, the side frame includes a first connecting part and a second connecting part; the first connecting part and the second connecting part are connected at an angle, the first connecting part is connected to the base frame, and the second connecting part is connected to the top frame; both the first connecting part and the second connecting part are provided with the support assembly.

[0009] In a preferred embodiment of the present invention, in the same gantry module, the side frames of adjacent steel frames are connected by a top beam, and the bottom frames of adjacent steel frames are connected by a bottom beam. In the same steel frame, a crossbeam is provided between the two base frames.

[0010] In a preferred embodiment of the present invention, the support member includes a support shoe and a pad, the side of the support shoe facing the tube segment is arc-shaped, and the pad is disposed on the side of the support shoe facing the tube segment; the support drive source is fixed on the steel frame, and the power output end of the support drive source is connected to the support shoe.

[0011] In a preferred embodiment of the present invention, the support assembly further includes a pressure sensor, which detects in real time the supporting force of the support shoe on the segment.

[0012] In a preferred embodiment of the present invention, the walking mechanism further includes a walking wheel assembly disposed on the slider; the walking drive source drives the walking wheel assembly to cause the slider to move relative to the track.

[0013] Another objective of this invention is to provide a method of using the aforementioned ultra-small clearance large shield tunneling trolley.

[0014] A method for using a large shield tunneling trolley with ultra-small clearance includes the following steps: S1. Assembly and debugging of the trolley; The gantry system is assembled in the shield tunneling starting shaft. The deviation between the axis of the gantry system and the tunnel design centerline is ≤5mm using a total station. When assembling the gantry system, top and bottom beams are installed between the steel frames, and crossbeams are installed between the two bottom frames of each steel frame to reinforce the steel frame. Multiple evenly distributed support components are installed on each steel frame, and each support component is equipped with a pressure sensor, followed by an unloaded pressure test. S2, Trolley positioning and initial support; The trolley is propelled to the target section by a walking system, and the position deviation is calibrated to be ≤10mm by a laser rangefinder. The support components on each steel frame are pushed up in a preset sequence, with the initial pressure at 80% of the design value. After holding the pressure for 5 minutes, the pressure is gradually increased to 100%. S3, trolley movement mechanism; The gantry module of the gantry system includes at least a first gantry module and a second gantry module; when the trolley moves forward, the support components on the first gantry module unload their support for the tunnel segment and move forward through the traveling mechanism corresponding to the first gantry module, while the second gantry module remains stationary and its support components continue to support the tunnel segment; After the first gantry module moves forward into position, the support components on the first gantry module re-support the tube segment and hold it in place. The support components on the second gantry module unload their support on the tube segment and move forward through the traveling mechanism corresponding to the second gantry module until the second gantry module moves into position. Then, the support components on the second gantry module re-support the tube segment. This cycle continues, employing a combined drive mode of alternating jacking and traveling mechanisms to achieve segmented advancement without unloading the segment support force, with the trolley's midpoint always corresponding to the tunnel face of the following tunnel.

[0015] Preferably, the steel frame includes two base frames, two side frames, and a top frame; the two base frames are mounted on the traveling mechanism, the two side frames are respectively mounted on top of the two base frames, and the top frame is located between the two side frames; each base frame and the top frame has a support assembly on the side facing the tunnel segment, and each side frame has two support assemblies on the side facing the tunnel segment; the two base frames are a first base frame and a second base frame; the two side frames are a first side frame and a second side frame; the tunnel section is connected sequentially along a clockwise direction: the first base frame, the first side frame, the top frame, the second side frame, and the second base frame. In step S2, the support components on each steel frame are supported in a preset sequence, as follows: The support components on the first base frame provide support for the tunnel segments; The support components on the top frame support the segments; The support components on the second base frame provide support for the tunnel segments; The support components on the first side frame near the top frame provide support; The support components on the second side frame, near the second base frame, provide support. The support components on the first side frame, close to the first base frame, provide support. The support components on the second side frame, near the top frame, provide support.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention overcomes the shortcomings of existing technologies, such as low efficiency and poor automation in segment support, and facilitates the synchronous operation of shield tunneling and segment support throughout the entire process, ensuring the safety and efficiency of ultra-small clearance tunnel construction. When using the ultra-small clearance large shield tunneling trolley of this invention, a composite drive mode combining alternating jacking and a traveling mechanism is adopted to achieve segmented advancement without unloading the segment support force. This ensures both the jacking effect on the segments during trolley movement and the efficient segmented forward advancement of the trolley. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view of the ultra-small clearance large shield tunneling trolley of the present invention.

[0019] Figure 2 for Figure 1 Side view (the dashed lines in the figure are used to indicate the part of the gantry module).

[0020] Figure 3 for Figure 1 A three-dimensional image.

[0021] Figure 4 This is a three-dimensional diagram of the steel frame.

[0022] Figure 5 This is a schematic diagram of two gantry modules of a large shield tunneling trolley with ultra-small clearance (the dashed lines in the diagram are used to indicate the gantry modules).

[0023] Figure 6 This is a schematic diagram of the steel frame composition of a large shield tunneling trolley with ultra-small clearance.

[0024] in: 1-Gantry system, 101-Gantry module, 1011-Steel frame, 10111-Base frame, 10112-Side frame, 101121-First connecting part, 101122-Second connecting part, 10113-Top frame, 10114-Connecting part; 10115-First base frame, 10116-First side frame, 10117-Second side frame, 10118-Second base frame, 102-First gantry module, 103-Second gantry module; 2-Support system, 201-Support shoe, 202-Main layer, 203-Support drive source; 3-Walking system, 301-Rail, 302-Slider, 303-Walking wheel set; 4-Support block; 5-Top beam; 6-Bottom beam; 7-Crossbeam. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0027] Example 1 See Figures 1-4 This embodiment discloses an ultra-small clearance large shield tunneling trolley, including a gantry system 1, a support system 2, and a traveling system 3.

[0028] The gantry system 1 includes at least one gantry module 101, and each gantry module 101 includes at least one steel frame 1011. The steel frames 1011 of the same gantry module 101 are arranged sequentially and adjacent steel frames 1011 are connected to each other. In this embodiment, it is illustrated by the example of having two gantry modules 101 and three steel frames 1011 in each gantry module 101. The number of gantry modules 101 and the number of steel frames 1011 in each gantry module 101 can be flexibly adjusted according to actual needs.

[0029] The support system 2 in this embodiment includes several support modules, with each steel frame 1011 equipped with one support module; each support module includes multiple support components, which are evenly distributed on the steel frame 1011 at a specified angle to support the tunnel segments, forming a fan-shaped support area; for example Figure 1 As shown, the angle between two adjacent support components is 34 degrees, although this spacing can be adjusted flexibly. Each support component includes a support member and a support drive source 203 for driving the extension and retraction of the support member.

[0030] The walking system 3 of this embodiment includes a track 301 and several walking mechanisms; the track 301 is set at the bottom of the tunnel, each walking mechanism corresponds to each gantry module 101 and the gantry module 101 is set on the walking mechanism; the walking mechanism includes a slider 302 adapted to the track 301 and a walking drive source for driving the gantry module 101 to move along the track 301.

[0031] Specifically, the steel frame 1011 in this embodiment is arched and includes two base frames 10111, two side frames 10112, and a top frame 10113. The two base frames 10111 are mounted on the traveling mechanism, the two side frames 10112 are respectively mounted on the top of the two base frames 10111, and the top frame 10113 is located between the two side frames 10112. Support components are provided on the side of the base frames 10111, the side frames 10112, and the top frame 10113 facing the pipe segment.

[0032] In this embodiment, connecting portions 10114 are provided at both ends of the base frame 10111, side frame 10112, and top frame 10113. The connecting portions 10114 have a flanged structure and multiple connecting holes. The connecting portions 10114 are connected between the base frame 10111 and the side frame 10112, and between the side frame 10112 and the top frame 10113, and are locked in place by locking components. In this embodiment, the locking components can be bolts and nuts, or other parts that can mate with the connecting holes, enabling convenient and reliable assembly, fixation, and disassembly of the steel frame 1011.

[0033] Further, the side frame 10112 includes a first connecting part 101121 and a second connecting part 101122; the first connecting part 101121 and the second connecting part 101122 are connected at an angle, the first connecting part 101121 is connected to the base frame 10111, and the second connecting part 101122 is connected to the top frame 10113; both the first connecting part 101121 and the second connecting part 101122 are provided with support components. By setting such a side frame 10112 structure, it can form an arched structure after assembly with the base frame 10111 and the top frame 10113, corresponding to the arc-shaped inner wall of the tunnel segment. In this embodiment, both the base frame 10111 and the top frame 10113 are provided with a support component, and seven support components are fitted on one steel frame 1011, such as... Figure 1 and Figure 3 As shown.

[0034] In this embodiment, the base frame 10111, side frame 10112, and top frame 10113 are all provided with internal cavities. This can reduce the weight of the steel frame 1011, making manufacturing and transportation easier, and also facilitate cable routing through the internal cavity space.

[0035] See Figure 1 and Figure 3 In the same gantry module 101, the side frames 10112 of adjacent steel frames 1011 are connected by a top beam 5, and the base frames 10111 of adjacent steel frames 1011 are connected by a bottom beam 6. A crossbeam 7 is provided between two base frames 10111 within the same steel frame 1011. The arrangement of the top beam 5, bottom beam 6, and crossbeam 7 enhances the strength of the steel frames 1011 within the same gantry module 101, as well as the strength of the steel frames themselves, resulting in improved reliability.

[0036] Furthermore, in this embodiment, the bottom beam 6 of the same gantry module 101 is an integral structure, and the bottom frames 10111 of multiple steel frames 1011 are simultaneously fixed on the bottom beam 6, and cooperate with the walking mechanism through the bottom beam 6. For details of the specific implementation method, please refer to the following text.

[0037] Furthermore, such as Figures 2-3 As shown, a support block 4 is provided at the bottom of the bottom beam 6. The support block 4 rests on the track 301. The support block 4 can be of an adjustable height or a detachable structure. The support block 4 further improves the support stability and reliability of the gantry module 101. When the gantry module 101 moves, the support block 4 can be separated from the track 301 by adjusting its height or by removing it. After the gantry module 101 moves into place, the support block 4 can be readjusted or reinstalled.

[0038] See Figure 1 and Figure 3The support member in this embodiment includes a support shoe 201 and a pad 202. The side of the support shoe 201 facing the tube segment is arc-shaped, and the pad 202 is disposed on the side of the support shoe 201 facing the tube segment. The pad 202 can be a rubber pad. The support drive source 203 is fixed on the steel frame 1011, and the power output end of the support drive source 203 is connected to the support shoe 201.

[0039] In this embodiment, the support drive source 203 can be a hydraulic cylinder, pneumatic cylinder, motor, etc. Furthermore, in this embodiment, each support assembly has two support drive sources 203, which work together to drive the telescopic movement of one support member, making the support of the tunnel segment more reliable and the support force more uniform and balanced. For example, in this embodiment, the support drive source 203 is a 50T hydraulic cylinder with a stroke of 250mm.

[0040] The support components in this embodiment can also be equipped with pressure sensors, which detect the supporting force of the support shoe 201 on the tunnel segment in real time. The trolley in this embodiment can be used with an intelligent monitoring system. The pressure sensors feed back the detected pressure data to the intelligent monitoring system so that the supporting force of each support component on the tunnel segment can be observed in real time. At the same time, it can also be combined with model data to remotely adjust the supporting force of each support component on the tunnel segment, thereby improving the supporting effect.

[0041] Furthermore, the walking mechanism in this embodiment also includes a walking wheel set 303, which is mounted on the slider 302. The walking drive source drives the walking wheel set 303 to cause the slider 302 to move relative to the track 301. The walking wheel set 303 in this embodiment is similar to existing technology; it can rest on the track 301 or on the tunnel floor. Driven by the walking drive source, the walking wheel set 303 rotates, thus moving the slider 302. The cooperation between the slider 302 and the track 301 improves movement stability and accuracy, providing guidance. The bottom beam 6 in this embodiment is connected to the slider 302 and moves with it. The walking drive source can consist of a motor and a frequency converter; alternatively, it can be driven by a hydraulic cylinder.

[0042] Example 2 See Figures 1-6 This embodiment discloses a method of using the ultra-small clearance large shield tunneling trolley of Embodiment 1, including the following steps: S1. Assembly and debugging of the trolley.

[0043] The gantry system 1 is assembled in the shield tunneling starting shaft. The deviation between the axis of the gantry system 1 and the tunnel design centerline is ≤5mm using a total station. When assembling the gantry system 1, the top beam 5 and bottom beam 6 are installed between the steel frames 1011, and the cross beam 7 is installed between the two bottom frames 10111 of each steel frame 1011 to reinforce the steel frame 1011. Multiple evenly distributed support components are installed on each steel frame 1011, and each support component is equipped with a pressure sensor. A no-load pressure test is then performed. In this embodiment, the trolley is used in conjunction with an intelligent monitoring system; therefore, the intelligent monitoring system is simultaneously debugged, and the segment ellipticity threshold and misalignment alarm value are set.

[0044] S2, Trolley positioning and initial support.

[0045] The trolley is propelled to the target section by the walking system 3, and the position deviation is calibrated to ≤10mm by a laser rangefinder. The support components on each steel frame 1011 are pushed up in a preset sequence, with the initial pressure being 80% of the design value. After holding the pressure for 5 minutes, the pressure is gradually increased to 100%. A 3D scanner can also be used to scan the shape of the tube segments and generate an initial baseline model.

[0046] S3, trolley movement mechanism.

[0047] like Figure 5 As shown, the gantry system 1 of Embodiment 1 has two gantry modules 101, namely a first gantry module 102 and a second gantry module 103. When the trolley moves forward, the support components on the first gantry module 102 unload their support for the tunnel segment and move forward through the traveling mechanism corresponding to the first gantry module 102, while the second gantry module 103 remains stationary and its support components continue to support the tunnel segment; After the first gantry module 102 is advanced into position, the support components on the first gantry module 102 re-support the tube segment and maintain it. The support components on the second gantry module 103 unload the support on the tube segment and move forward through the traveling mechanism corresponding to the second gantry module 103 until the second gantry module 103 moves into position, and then the support components on the second gantry module 103 re-support the tube segment. This cycle continues, employing a combined drive mode of alternating jacking and traveling mechanisms to achieve segmented advancement without unloading the segment support force, with the trolley's midpoint always corresponding to the tunnel face of the following tunnel.

[0048] like Figure 6 As shown, further, the support components on each steel frame 1011 in Embodiment 1 operate in a "symmetrical grouping, alternating top support" mode. For example, each steel frame 1011 includes two base frames, two side frames, and one top frame 10113, wherein the two base frames are the first base frame 10115 and the second base frame 10118; the two side frames are the first side frame 10116 and the second side frame 10117; the tunnel section is connected sequentially along the clockwise direction: the first base frame 10115, the first side frame 10116, the top frame 10113, the second side frame 10117, and the second base frame 10118.

[0049] That is, in step S2, the support components on each steel frame 1011 are supported in a preset order, as follows: The support components on the first base frame 10115 support the segments; The support components on the top frame 10113 support the tunnel segments; The support components on the second base frame 10118 provide support for the tunnel segments; The support components on the first side frame 10116 near the top frame 10113 provide support; The support components on the second side frame 10117, which are close to the second base frame 10118, provide support. The support components on the first side frame 10116, which are close to the first base frame 10115, provide support. The second side frame 10117 is supported by the support components near the top frame 10113.

[0050] During the jacking process, the jacking interval of each support component is ≤10s; the pressure sensor detects the pressure in real time, and the pressure of each support component is remotely adjusted through the intelligent monitoring system to control the pressure difference between adjacent support components to ≤5%.

[0051] The above-mentioned jacking method helps to avoid the local load superposition and mutual interference caused by the continuous jacking of adjacent support components, and follows the principle of symmetrical force distribution of the structure.

[0052] In addition, during the construction process, FLAC3D software can be used to establish a finite element numerical analysis model of the shield tunneling process, analyze the impact of the subsequent tunnel excavation on the preceding tunnel in the ultra-small clearance parallel large-diameter shield tunnel, and the stress and deformation of each support of the trolley in the preceding tunnel. Based on the results, the structural design of the synchronous support trolley for the segments of the ultra-small clearance large shield tunnel can be improved.

[0053] Research has shown that using the trolley of this invention for segment support construction improves construction efficiency, provides precise deformation control, reduces segment ellipticity deviation to ≤2.8‰ (compared to 5-8‰ in traditional methods), and lowers the standard deviation of misalignment from 2.5mm to 0.8mm; it also offers high safety and reliability.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A large shield tunneling trolley with ultra-small clearance, characterized in that, This includes the gantry system, support system, and travel system; The gantry system includes at least one gantry module, each gantry module includes at least one steel frame, and the steel frames of the same gantry module are arranged sequentially and adjacent steel frames are connected to each other. The support system includes several support modules, and each steel frame is equipped with one support module; each support module includes multiple support components, which are evenly distributed on the steel frame at a specified angle and support the tunnel segments to form a fan-shaped support area; each support component includes a support member and a support drive source for driving the support member to extend and retract. The walking system includes a track and several walking mechanisms; the track is set at the bottom of the tunnel, each walking mechanism corresponds to each gantry module and the gantry module is set on the walking mechanism; the walking mechanism includes a slider adapted to the track and a walking drive source for driving the gantry module to move along the track.

2. The ultra-small clearance large shield tunneling trolley according to claim 1, characterized in that, The steel frame is arched and includes two base frames, two side frames, and a top frame; the two base frames are mounted on the traveling mechanism, the two side frames are respectively mounted on top of the two base frames, and the top frame is located between the two side frames; the support components are provided on the side of the base frames, the side frames, and the top frame facing the tube segment.

3. The ultra-small clearance large shield tunneling trolley according to claim 2, characterized in that, The base frame, the side frame, and the top frame are all provided with connecting parts at both ends; the connecting parts have a flanged structure and are provided with multiple connecting holes; the connecting parts between the base frame and the side frame, and between the side frame and the top frame, are connected and locked and fixed by locking members.

4. The ultra-small clearance large shield tunneling trolley according to claim 2, characterized in that, The side frame includes a first connecting part and a second connecting part; the first connecting part and the second connecting part are connected at an angle, the first connecting part is connected to the base frame, and the second connecting part is connected to the top frame; both the first connecting part and the second connecting part are provided with the support component.

5. The ultra-small clearance large shield tunneling trolley according to any one of claims 2-4, characterized in that, In the same gantry module, the side frames of adjacent steel frames are connected by top beams, and the bottom frames of adjacent steel frames are connected by bottom beams. In the same steel frame, a crossbeam is provided between the two base frames.

6. The ultra-small clearance large shield tunneling trolley according to claim 1, characterized in that, The support includes a support shoe and a pad. The side of the support shoe facing the tube segment is arc-shaped, and the pad is disposed on the side of the support shoe facing the tube segment. The support drive source is fixed on the steel frame, and the power output end of the support drive source is connected to the support shoe.

7. The ultra-small clearance large shield tunneling trolley according to claim 1 or 6, characterized in that, The support assembly also includes a pressure sensor, which detects the supporting force of the support shoe on the segment in real time.

8. The ultra-small clearance large shield tunneling trolley according to claim 1, characterized in that, The walking mechanism also includes a set of walking wheels, which are disposed on the slider; the walking drive source drives the set of walking wheels to cause the slider to move relative to the track.

9. A method of using the ultra-small clearance large shield tunneling trolley as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Assembly and debugging of the trolley; The gantry system is assembled in the shield tunneling starting shaft. The deviation between the axis of the gantry system and the tunnel design centerline is ≤5mm using a total station. When assembling the gantry system, top and bottom beams are installed between the steel frames, and crossbeams are installed between the two bottom frames of each steel frame to reinforce the steel frame. Multiple evenly distributed support components are installed on each steel frame, and each support component is equipped with a pressure sensor, followed by an unloaded pressure test. S2, Trolley positioning and initial support; The trolley is propelled to the target section by a walking system, and the position deviation is calibrated to be ≤10mm by a laser rangefinder. The support components on each steel frame are pushed up in a preset sequence, with the initial pressure at 80% of the design value. After holding the pressure for 5 minutes, the pressure is gradually increased to 100%. S3, trolley movement mechanism; The gantry module of the gantry system includes at least a first gantry module and a second gantry module; when the trolley moves forward, the support components on the first gantry module unload their support for the tunnel segment and move forward through the traveling mechanism corresponding to the first gantry module, while the second gantry module remains stationary and its support components continue to support the tunnel segment; After the first gantry module moves forward into position, the support components on the first gantry module re-support the tube segment and hold it in place. The support components on the second gantry module unload their support on the tube segment and move forward through the traveling mechanism corresponding to the second gantry module until the second gantry module moves into position. Then, the support components on the second gantry module re-support the tube segment. This cycle continues, employing a combined drive mode of alternating jacking and traveling mechanisms to achieve segmented advancement without unloading the segment support force, with the trolley's midpoint always corresponding to the tunnel face of the following tunnel.

10. The method of use according to claim 9, characterized in that, The steel frame includes two base frames, two side frames, and a top frame; the two base frames are mounted on the traveling mechanism, the two side frames are respectively mounted on top of the two base frames, and the top frame is located between the two side frames; each base frame and the top frame has a support assembly on the side facing the tunnel segment, and each side frame has two support assemblies on the side facing the tunnel segment; the two base frames are a first base frame and a second base frame; the two side frames are a first side frame and a second side frame; the tunnel section is connected sequentially along a clockwise direction: the first base frame, the first side frame, the top frame, the second side frame, and the second base frame. In step S2, the support components on each steel frame are supported in a preset sequence, as follows: The support components on the first base frame provide support for the tunnel segments; The support components on the top frame support the segments; The support components on the second base frame provide support for the tunnel segments; The support components on the first side frame near the top frame provide support; The support components on the second side frame, near the second base frame, provide support. The support components on the first side frame, close to the first base frame, provide support. The support components on the second side frame, near the top frame, provide support.

Images