Two-way expansion tunnel shield disassembly hole surrounding rock supporting mechanism and construction method

Abstract

The present application relates to the technical field of tunnel construction, in particular to a bidirectional expansion and excavation surrounding rock supporting mechanism for a shield disassembly tunnel of a submarine tunnel and a construction method, the bidirectional expansion and excavation construction method for the shield disassembly tunnel of the submarine tunnel comprising supporting the tunnel by the bidirectional expansion and excavation surrounding rock supporting mechanism for the shield disassembly tunnel of the submarine tunnel through a steel arch; the bidirectional expansion and excavation surrounding rock supporting mechanism for the shield disassembly tunnel of the submarine tunnel comprising a vehicle body and a chuck, wherein the chuck is movably arranged on the vehicle body and is used for clamping the steel arch; two positioning wheel sets are arranged on the chuck, and the two positioning wheel sets are respectively inserted into upper and lower arch grooves of the steel arch when installed; each positioning wheel set comprises a plurality of positioning wheels, the positioning wheels of the same positioning wheel set are arranged in a circumferential direction, the arc of the positioning wheels is equal to the set arc of the steel arch, the positioning wheels can rotate around their own axes, and the wheel surface of the positioning wheels can form rolling cooperation with the groove side wall of the steel arch, so that the wear of the positioning wheels can be reduced and the positioning accuracy of the steel arch can be ensured.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to a support mechanism and construction method for bidirectional excavation of the surrounding rock in a submarine tunnel shield dismantling tunnel. Background Technology

[0002] During the construction of an undersea tunnel, after the tunnel boring machine (TBM) completes its excavation task, it needs to be systematically dismantled in a pre-excavated dismantling tunnel. This process usually involves several closely linked steps, such as the overall dismantling of the TBM, the precise disassembly of key components, the transportation in batches, and the testing and reuse of reusable components. Whether each step can be carried out smoothly directly affects the overall efficiency and cost control of the tunnel construction.

[0003] In the excavation and construction of shield tunnel dismantling tunnels, commonly used methods include bidirectional widening excavation, unidirectional layered excavation, and bench excavation. Among these, bidirectional widening excavation has been widely used in the construction of dismantling tunnels for submarine tunnels under various geological conditions due to its outstanding advantages, such as significantly shortening the excavation period, reducing the disturbance range to the surrounding rock, and facilitating construction organization and resource allocation.

[0004] During the bidirectional widening excavation of the shield tunnel dismantling tunnel, to ensure the long-term stability and safety of the tunnel structure, initial support and secondary lining construction must be carried out in stages. The core function of initial support is to promptly bear the stress released by the surrounding rock after excavation, effectively restraining rock deformation, thereby maintaining the temporary stability of the shield tunnel structure during construction. Within the initial support system, the steel arch frame is the most critical load-bearing structure, primarily fabricated from I-beams or lattice steel arch frames. Considering construction convenience and structural precision requirements, steel arch frames are typically prefabricated in specialized processing plants using modular methods, then transported to the construction site for manual assembly and installation. However, manual installation has significant drawbacks: firstly, it involves high labor intensity for workers and slow assembly and installation speed, directly impacting construction progress; secondly, the steel arch frame installation work surface is often located in newly excavated sections where the surrounding rock is not yet fully stable, making rockfalls highly likely and posing significant safety hazards to construction personnel, resulting in a high level of operational risk.

[0005] To address the efficiency and safety issues associated with manual installation of steel arch frames, various auxiliary devices have been developed in related fields. Taking the tunnel steel arch frame installation auxiliary device disclosed in Chinese patent application CN119900595A as an example, it limits the position of the steel arch frame by interfering with the insertion of a clamping rod into the arch groove during clamping. However, because the clamping rod and the arch groove are in an interference fit, the surface of the clamping rod continuously wears down during repeated insertion and removal. With increasing usage, the size of the clamping rod gradually decreases, leading to a continuous increase in the gap between the clamping rod and the steel arch frame. Ultimately, this results in a decrease in the positioning accuracy of the steel arch frame, affecting the construction quality of the initial support structure. Summary of the Invention

[0006] Therefore, it is necessary to provide a support structure and construction method for the surrounding rock of the bidirectional expansion of the shield tunnel dismantling tunnel in the current process of poor support effect.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A bidirectional excavation support mechanism for the surrounding rock of a submarine tunnel shield dismantling tunnel, comprising:

[0009] Vehicle body;

[0010] A chuck is movably mounted on the vehicle body and configured to clamp a steel arch frame. The chuck is equipped with two positioning wheel sets, which are arranged vertically and inserted into the upper and lower arch grooves of the steel arch frame during installation. Each positioning wheel set includes multiple positioning wheels, which are arranged circumferentially with an arc equal to the set arc of the steel arch frame. The positioning wheels can rotate around their own axis, and the wheel surface of the positioning wheel can form a rolling fit with the groove sidewall of the steel arch frame.

[0011] Furthermore, each positioning wheel has multiple friction roller groups inserted into its circumferential sidewall. These friction roller groups on the same positioning wheel are arranged circumferentially, and each friction roller group includes multiple friction rollers. These friction rollers are arranged axially along the positioning wheel, with their axes perpendicular to the positioning wheel's axis. Each friction roller can rotate around its own axis. Each friction roller has multiple friction teeth extending parallel to its axis. These friction teeth on the same friction roller are spaced circumferentially and cover half of the friction roller's circumferential sidewall. The bidirectional excavation rock support mechanism for the undersea tunnel shield dismantling tunnel also includes a transmission component and an adjustment component. The transmission component is configured to drive multiple positioning wheels in the same group to rotate synchronously and in the same direction. The adjustment component is configured to adjust the frictional contact between the friction teeth and the groove sidewall of the steel arch frame when the positioning wheel rotates.

[0012] Furthermore, the adjustment assembly includes sliding rods, with multiple sliding rods inserted into each positioning wheel. These sliding rods are arranged circumferentially within the same positioning wheel and extend radially along the positioning wheel, allowing for elastic sliding along the radial direction. Multiple cams are also fixedly mounted on the chuck, with each positioning wheel containing a cam that can engage with the sliding rods to form a stop. Multiple sliding racks are inserted into the circumferential sidewall of each positioning wheel, arranged circumferentially on the same positioning wheel. These sliding racks extend parallel to the axis of the positioning wheel and can elastically slide along their extension direction. The sliding racks can engage with the friction teeth on the multiple friction rollers on the same positioning wheel for transmission and with the sliding rods for guidance.

[0013] Furthermore, the transmission assembly includes an external gear ring, with an external gear ring sleeved on each of the positioning wheels, and a transmission belt connecting the external gear rings on adjacent positioning wheels in the same group; the chuck is also provided with a gear, which can rotate around its own axis, slide along the radial direction of the positioning wheel, and mesh with the outermost external gear ring in the same group.

[0014] Furthermore, the transmission assembly also includes a first drive member configured to provide a driving force for the rotation of the gear.

[0015] Furthermore, the transmission assembly also includes a second drive member configured to provide a driving force for the gear to slide in a radial direction.

[0016] Furthermore, the friction roller has a structure that is thick in the middle and thin at both ends.

[0017] Furthermore, the bidirectional excavation support mechanism for the undersea tunnel shield dismantling tunnel also includes two first telescopic rods and two positioning seats. The two first telescopic rods are symmetrically arranged about the vehicle body, and the fixed end of each first telescopic rod is hinged to the vehicle body. The first telescopic rods can rotate around a vertical line. The sliding end of each first telescopic rod is provided with a positioning groove. The positioning groove has an inverted Y-shaped structure, and the main groove and one of the branch grooves are on the same vertical line. The two positioning seats are detachably set at both ends of the steel arch frame. Each positioning seat is provided with two insert rods. When installed, the two insert rods on the same positioning seat are respectively inserted into the two branch grooves of the positioning groove.

[0018] Furthermore, the curvature of multiple positioning wheels in the same positioning wheel set can be adjusted according to the curvature of the steel arch frame.

[0019] This invention also provides a construction method for bidirectional expansion of the subsea tunnel shield dismantling tunnel, which employs a surrounding rock support mechanism for bidirectional expansion of the subsea tunnel shield dismantling tunnel using steel arch frames to support the tunnel; the construction method for bidirectional expansion of the subsea tunnel shield dismantling tunnel includes the following steps:

[0020] S1: The main tunnel is constructed with the normal cross-section facing forward. Construction is stopped after the tunnel location is dismantled at a predetermined distance.

[0021] S2: A detour pilot tunnel is set up and constructed on one side of the main tunnel;

[0022] S3: Based on the survey data, geophysical exploration and drilling methods are used to verify the geological conditions at the location of the dismantling tunnel;

[0023] S4: Backfill the area below the pre-designed dismantling tunnel with tunnel slag, forming a construction ramp on one side and completely sealing off the other side;

[0024] S5: The slope side is widened by top-lifting excavation according to the designed support parameters;

[0025] S6: Move the vehicle body to the bottom of the tunnel; then place the first and second steel arch frames on the vehicle body, and rotate the clamp to insert the two positioning wheel sets into the upper and lower arch grooves of the steel arch frame, respectively, and position them at the junction of the first and second steel arch frames. Then, fix the first and second steel arch frames together. Repeat the steps of placing the Nth steel arch frame, rotating the clamp, and fixing the adjacent steel arch frame until the steel arch frame is formed, where N is a natural number greater than or equal to three. Then, move the clamp to the middle of the two positioning wheel sets on the steel arch frame. Then, rotate the clamp to make the steel arch frame vertical, and then move the steel arch frame to the installation position in the tunnel through the clamp. Finally, fix the steel arch frame on the tunnel.

[0026] S7: After the top excavation and support of the ramp side is completed, excavate and support downwards in layers to the preset height until the excavation conditions on the other side are met.

[0027] S8: Backfill the slag in the tunnel according to the method in S4, and expand the excavation from the other side until the excavation and support of the upper part of the tunnel are dismantled;

[0028] S9: Complete the excavation and support of the middle section from one side;

[0029] S10: Complete the excavation and support of the lower part from one side.

[0030] The beneficial effects of this invention are:

[0031] This invention relates to a support structure and construction method for bidirectional excavation of the surrounding rock in a submarine tunnel shield dismantling tunnel. The construction method for bidirectional excavation of the submarine tunnel shield dismantling tunnel includes using a support structure for bidirectional excavation of the surrounding rock in a submarine tunnel shield dismantling tunnel, which supports the tunnel using steel arch frames. When in use, the support structure for bidirectional excavation of the surrounding rock in a submarine tunnel shield dismantling tunnel utilizes positioning wheel sets and their motion characteristics to create a rolling fit between the wheel surfaces and the groove sidewalls of the steel arch frames when fixing them. Compared to existing methods that insert the positioning wheels into the arch grooves using sliding friction, this rolling friction method not only reduces wear on the positioning wheels, extends their service life and improves reliability, but also ensures the positioning accuracy of the steel arch frames, improving the construction quality of the initial support structure and the quality of subsequent support.

[0032] Furthermore, by setting friction rollers and cooperating transmission and adjustment components, the steel arch frame can be rotated after it reaches the top of the tunnel, thereby achieving fine adjustment of its position and further improving the installation accuracy of the steel arch frame and ensuring the quality of support.

[0033] Furthermore, by setting up a first telescopic rod and a positioning seat, the quality of the steel arch frame assembly is improved through the limiting cooperation between the two, ensuring the subsequent compatibility with the shape of the tunnel top. Attached Figure Description

[0034] Figure 1 A three-dimensional structural diagram of the support mechanism for bidirectional excavation of the surrounding rock in the shield tunnel dismantling tunnel provided in an embodiment of the present invention when clamping a horizontal steel arch frame;

[0035] Figure 2 A three-dimensional structural diagram of the underwater tunnel shield dismantling tunnel bidirectional expansion rock support mechanism with the vehicle body and the first telescopic rod removed, provided in an embodiment of the present invention, when clamping a vertical steel arch frame;

[0036] Figure 3A three-dimensional structural diagram of a bidirectional widening rock support mechanism for a submarine tunnel shield tunneling dismantling tunnel, excluding the vehicle body, the first telescopic rod, and the positioning seat, provided in an embodiment of the present invention. Figure 1 ;

[0037] Figure 4 A three-dimensional structural diagram of a bidirectional widening rock support mechanism for a submarine tunnel shield tunneling dismantling tunnel, excluding the vehicle body, the first telescopic rod, and the positioning seat, provided in an embodiment of the present invention. Figure 2 ;

[0038] Figure 5 This is a front view structural diagram of a bidirectional expansion and surrounding rock support mechanism for a submarine tunnel shield dismantling tunnel, with the vehicle body, the first telescopic rod, and the positioning seat removed, provided in an embodiment of the present invention.

[0039] Figure 6 for Figure 5 Sectional view along the AA direction;

[0040] Figure 7 A three-dimensional structural diagram of the positioning wheel, friction roller, external toothed ring, sliding rod, and sliding rack of the bidirectional widening excavation surrounding rock support mechanism for the undersea tunnel shield dismantling tunnel provided in this embodiment of the invention. Figure 1 ;

[0041] Figure 8 A three-dimensional structural diagram of the positioning wheel, friction roller, external toothed ring, sliding rod, and sliding rack of the bidirectional widening excavation surrounding rock support mechanism for the undersea tunnel shield dismantling tunnel provided in this embodiment of the invention. Figure 2 ;

[0042] Figure 9 This is a side view of the positioning wheel, friction roller, external toothed ring, sliding rod and sliding rack of the bidirectional expansion excavation surrounding rock support mechanism for the submarine tunnel shield dismantling tunnel provided in an embodiment of the present invention.

[0043] Figure 10 for Figure 9 Sectional view along the BB direction;

[0044] Figure 11 for Figure 10 A magnified schematic diagram of the structure at point Y in the middle;

[0045] Figure 12 for Figure 10 A magnified schematic diagram of the structure at point Z in the middle;

[0046] Figure 13 A three-dimensional structural diagram of the sliding end of the first telescopic rod of the bidirectional excavation surrounding rock support mechanism for the undersea tunnel shield dismantling tunnel provided in an embodiment of the present invention;

[0047] Figure 14This is a three-dimensional structural diagram of the clamp of the bidirectional expansion and surrounding rock support mechanism for the shield tunnel dismantling tunnel provided in an embodiment of the present invention.

[0048] in:

[0049] 1. Vehicle body; 101. Support plate; 102. Support; 1021. Rotating shaft; 103. Second drive cylinder; 104. Second telescopic rod;

[0050] 2. Chuck; 201. Intermediate plate; 202. Clamping plate; 2021. Slide groove;

[0051] 3. Positioning wheels;

[0052] 4. Friction roller; 401. Friction tooth protrusion;

[0053] 501, sliding rod; 5011, first wedge surface; 502, first spring; 503, cam; 504, sliding rack; 5041, arc-shaped toothed protrusion; 5042, second wedge surface; 505, second spring;

[0054] 6. Transmission assembly; 601. External gear ring; 602. Transmission belt; 603. Gear; 604. First drive motor; 605. First drive cylinder;

[0055] 7. First telescopic rod; 701. Positioning groove;

[0056] 8. Positioning seat; 801. Insert rod;

[0057] 9. Steel arch frame. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0059] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0060] The following reference Figures 1 to 14 This invention describes a bidirectional excavation support mechanism for the dismantling tunnel of a submarine tunnel, which is particularly suitable for supporting the dismantling tunnel of a submarine tunnel. Of course, it is also suitable for supporting other tunnels, such as urban road tunnels, expressway tunnels, and subway tunnels.

[0061] Specifically, the support mechanism for the bidirectional expansion of the surrounding rock in the shield tunnel dismantling section of the undersea tunnel is configured as follows: a vehicle body 1 is provided at the front end of the vehicle body 1, and the surface of the support plate 101 is horizontally arranged; a support 102 is provided on the top of the support plate 101; the support 102 has a rotating shaft 1021, which is vertically arranged and can rotate around its own axis; the support 102 is rotatably connected to the support plate 101 through the rotating shaft 1021 and can rotate around the rotating shaft 1021 on the horizontal plane. To facilitate the provision of driving force for the rotation of support 102, the bidirectional expansion rock support mechanism for the undersea tunnel shield dismantling tunnel is configured to include a worm gear and a third driving component. The worm gear is fixedly sleeved on the rotating shaft 1021. Taking the third driving component as a second driving motor as an example, the second driving motor is fixedly installed on the top of the support plate 101. A worm is coaxially and fixedly installed on the motor shaft of the second driving motor. The worm is horizontally positioned and meshes with the worm gear. In use, the second driving motor is started, and the second driving motor drives the worm to rotate. The worm drives the worm gear to rotate through the transmission cooperation between the worm and the worm gear. The worm gear drives the support 102 to rotate through the rotating shaft 1021.

[0062] A second telescopic rod 104 is inserted into the front end of the support 102. The second telescopic rod 104 is telescopic, and its fixed end is hinged to the support 102. It can rotate around a horizontal line extending in the left-right direction. Initially, the second telescopic rod 104 extends horizontally in the front-back direction. To facilitate the provision of driving force for the rotation of the second telescopic rod 104, a second drive cylinder 103 is provided at the top of the support 102. The output shaft of the second drive cylinder 103 is hinged to the top of the fixed end of the second telescopic rod 104, which facilitates driving the second telescopic rod 104 to rotate around its own hinge point.

[0063] Understandably, the driving force for the extension and retraction of the second telescopic rod 104 can be provided by hydraulic pressure.

[0064] It is understandable that the second drive cylinder 103 can be configured as any one of a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder.

[0065] A clamp 2 is provided on the sliding end of the second telescopic rod 104. The clamp 2 has an intermediate plate 201. When installed, the rear plate of the intermediate plate 201 is vertical and fixedly set at the end of the sliding end of the second telescopic rod 104. Initially, the plate surface of the intermediate plate 201 is set vertically. Two clamping plates 202 are vertically and fixedly set on the front plate surface of the intermediate plate 201. The two clamping plates 202 are arranged at intervals and form a clamping space between them for clamping the steel arch frame 9. Initially, the plate surface of the clamping plates 202 is set horizontally, and the bottom of the lower clamping plate 202 abuts against the top of the support plate 101. In use, the steel arch frame 9 is placed horizontally between the two clamping plates 202 with the concave surface facing backward. Under the restriction of the two clamping plates 202, the freedom of the steel arch frame 9 in the vertical direction is restricted. When the support 102 rotates around the pivot 1021, the support 102 drives the clamp 2 to slide on the steel arch 9 via the second telescopic rod 104, thereby adjusting the relative position between the clamp 2 and the steel arch 9. When the output shaft of the second drive cylinder 103 retracts, the second telescopic rod 104 rotates upward around its hinge point, simultaneously driving the steel arch 9 from a horizontal state to a vertical state via the clamp 2, facilitating the subsequent alignment and installation of the steel arch 9 with the tunnel roof. When the output shaft of the second drive cylinder 103 extends, the second telescopic rod 104 rotates downward around its hinge point, simultaneously resetting the second telescopic rod 104 and the clamp 2. When the steel arch 9 is in a horizontal state, the second telescopic rod 104 extends, simultaneously driving the clamp 2 forward to align with the end of the steel arch 9, facilitating subsequent operations. When the steel arch 9 is in a vertical state, the second telescopic rod 104 extends, simultaneously driving the steel arch 9 upward via the clamp 2, thereby adjusting the distance between the steel arch 9 and the tunnel roof.

[0066] A positioning wheel set is provided on each of the two clamping plates 202 that are close to each other, and the two positioning wheel sets are set correspondingly. Initially, the two positioning wheel sets are arranged in the vertical direction. In use, the two positioning wheel sets are inserted into the upper and lower arch grooves of the steel arch frame 9 respectively. Under the restriction of the two positioning wheel sets, the freedom of the steel arch frame 9 in the front-back direction is restricted. Each positioning wheel set includes multiple positioning wheels 3. The multiple positioning wheels 3 of the same positioning wheel set are arranged in the circumferential direction, and the arc is equal to the set arc of the steel arch frame 9 to achieve positioning of the steel arch frame 9. Taking a positioning wheel set including four positioning wheels 3 as an example, the four positioning wheels 3 of the same positioning wheel set are arranged at equal intervals in the circumferential direction, and the concave surface of the arc structure formed is set to face backward to facilitate adaptation with the steel arch frame 9. The axis of the positioning wheel 3 is set perpendicular to the plate surface of the clamping plate 202, so that the wheel surface of the positioning wheel 3 can form a rolling fit with the groove side wall of the steel arch frame 9.

[0067] During use, the vehicle body 1 is first moved to the bottom of the tunnel; then the first steel arch frame 9 and the second steel arch frame 9 are placed on top of the support plate 101, and the ends of the first steel arch frame 9 and the second steel arch frame 9 are aligned, so that the first steel arch frame 9 and the second steel arch frame 9 form an arc-shaped structure, with the concave surface of the arc-shaped structure facing backward; then the second telescopic rod 104 is extended, and the clamp 2 is moved forward in sync, so that the ends of the clamp 2 and the second steel arch frame 9 are aligned; then the second drive motor is started, and the second drive motor drives the worm to rotate. The worm drives the worm wheel to rotate through the transmission between the worm and the worm wheel. The worm wheel drives the support 102 to rotate through the rotating shaft 1021. The support 102 drives the clamp 2 to rotate through the second telescopic rod 104. The clamp 2 drives two positioning wheel sets to insert into the upper and lower arch grooves of the second steel arch frame 9 from the upper and lower sides of the arc-shaped structure, and moves to the junction of the first steel arch frame 9 and the second steel arch frame 9.

[0068] During the movement of the clamp 2, the positioning wheel 3 rotates through frictional contact with the second section of the steel arch frame 9. Compared with the existing method of inserting into the arch groove of the steel arch frame 9 by sliding friction, the method of inserting into the arch groove of the steel arch frame 9 by rolling friction can not only significantly reduce the frictional wear between the positioning wheel 3 and the side wall of the arch groove of the steel arch frame 9, and avoid problems such as size reduction and surface deformation of the positioning wheel 3 due to long-term use, effectively extending the service life of the positioning wheel 3, but also reduce the frequency of equipment maintenance caused by the wear of the positioning wheel 3, ensuring the continuous and stable operation of the support mechanism during construction; moreover, it can utilize the low resistance characteristics of rolling friction to make the positioning wheel group insert into the arch groove more smoothly, avoiding the displacement of the positioning wheel group insertion position due to uneven sliding friction resistance.

[0069] Meanwhile, multiple positioning wheels 3 of the same positioning wheel set are arranged circumferentially and their curvature is perfectly matched with the set curvature of the steel arch frame 9. During the rolling process, they can always fit against the side wall of the arch groove, forming a precise contour constraint, avoiding the steel arch frame 9 from shifting in the front-back and left-right directions during the clamping and positioning stage, ensuring the end alignment accuracy of the first section of the steel arch frame 9 and the second section of the steel arch frame 9. Then, the first section of the steel arch frame 9 and the second section of the steel arch frame 9 are fixedly connected by bolt and nut assembly. Then, the third to Nth sections of the steel arch frame 9 are aligned with the previous section of the steel arch frame 9 in sequence, where N is a natural number greater than three, and the process of positioning the two positioning wheel sets and fixing the adjacent sections of the steel arch frame 9 by bolt and nut assembly is repeated until the steel arch frame 9 is formed. Then, the formed steel arch frame 9 is rotated, so that the middle part of the formed steel arch frame 9 and the rotating shaft 1021 are located on a horizontal line extending in the front-back direction. Then, the second drive motor is started, and the second drive motor drives the worm gear to rotate. The worm gear drives the worm wheel to rotate through the transmission cooperation between the worm gear and the worm wheel. The worm wheel drives the support 102 to rotate through the rotating shaft 1021. The support 102 drives the chuck 2 to rotate through the second telescopic rod 104. The chuck 2 drives the two positioning wheel sets to move to the middle part of the formed steel arch frame 9.

[0070] Then, the second drive cylinder 103 is activated, and the output shaft of the second drive cylinder 103 retracts, synchronously driving the second telescopic rod 104 to rotate upward. The second telescopic rod 104 synchronously drives the steel arch frame 9 to rotate through the clamp 2 and two positioning wheel sets, so that the steel arch frame 9 switches from a horizontal state to a vertical state. Then, the second telescopic rod 104 is extended, synchronously driving the steel arch frame 9 to move upward to the top of the tunnel through the clamp 2 and positioning wheel sets. Then, the steel arch frame 9 is fixed at the top of the tunnel, and the subsequent support steps can be carried out.

[0071] In a further embodiment, after the steel arch frame 9 moves upward to the top of the tunnel, the steel arch frame 9 may not align with the arc-shaped center of the tunnel due to minor deviations in the movement trajectory of the vehicle body 1 during the transportation process of the support mechanism, control errors in the extension and retraction of the second telescopic rod 104, fluctuations in the accuracy of the rotation angle of the clamp 2, or minor dimensional cumulative deviations caused by inter-segment connections (such as bolt and nut fixing) during the assembly stage. As a result, in order to align the two, it is necessary to first restore the steel arch frame 9 to a horizontal state, then adjust the position of the steel arch frame 9, and then repeat the process of moving the steel arch frame 9 upward to the top of the tunnel, which is cumbersome.

[0072] Based on this, in the bidirectional expansion and surrounding rock support mechanism for the undersea tunnel shield dismantling tunnel provided in this embodiment of the invention, multiple friction roller groups are inserted on the circumferential sidewall of each positioning wheel 3, and the multiple friction roller groups on the same positioning wheel 3 are arranged circumferentially; taking nine friction roller groups as an example, the nine friction roller groups are arranged at equal intervals circumferentially; each friction roller group includes multiple friction rollers 4, and the multiple friction rollers 4 in the same friction roller group are arranged along the axial direction of the positioning wheel 3, the axis of the friction roller 4 is perpendicular to the axis of the positioning wheel 3, and the friction roller 4 can rotate around its own axis; taking a friction roller group including five friction rollers 4 as an example, the five friction rollers in the same friction roller group are arranged circumferentially. The rollers 4 are arranged at equal intervals along the axial direction of the positioning wheels 3; each friction roller 4 is provided with multiple friction tooth protrusions 401, which are strip-shaped structures and extend in a direction parallel to the axis of the friction roller 4. Multiple friction tooth protrusions 401 on the same friction roller 4 are arranged at equal intervals in the circumferential direction and cover 180 degrees in the circumferential direction; the bidirectional expansion excavation surrounding rock support mechanism for the shield tunnel dismantling tunnel of the submarine tunnel is also provided with a transmission component 6 and an adjustment component. The transmission component 6 is configured to drive multiple positioning wheels 3 in the same group to rotate synchronously and in the same direction; the adjustment component is configured to adjust the frictional contact between the friction tooth protrusions 401 and the groove sidewall of the steel arch frame 9 when the positioning wheels 3 rotate.

[0073] During use, when the steel arch frame 9 reaches the installation position at the top of the tunnel, if the arc-shaped center of the steel arch frame 9 is not aligned with the arc-shaped center of the tunnel, the transmission component 6 drives multiple positioning wheels 3 of the same group to rotate synchronously and in the same direction. During the rotation of the positioning wheels 3, the friction tooth protrusion 401 and the groove sidewall of the steel arch frame 9 come into frictional contact under the action of the adjustment component. At this time, the friction force between the friction tooth protrusion 401 and the groove sidewall of the steel arch frame 9 is relatively large. Subsequently, during the rotation of the positioning wheels 3, the positioning wheels 3 can be synchronously driven to rotate the steel arch frame 9 by friction locking to adjust the arc-shaped center of the steel arch frame 9 to align with the arc-shaped center of the tunnel, thereby ensuring the construction and installation quality.

[0074] Furthermore, the adjustment assembly is configured to include sliding rods 501. Multiple sliding rods 501 are inserted into each positioning wheel 3, and these multiple sliding rods 501 within the same positioning wheel 3 are arranged circumferentially. The sliding rods 501 extend radially along the positioning wheel 3 and are positioned close to the clamping plate 202. When the number of friction rollers is nine, the number of sliding rods 501 is correspondingly nine, evenly arranged circumferentially and corresponding to the friction rollers 4. Each sliding rod 501 is fitted with a first spring 502, which connects the inner end of the sliding rod 501 to the positioning wheel 3. Under the action of the first spring 502, the sliding rod 501 can move along the positioning wheel 3. The radial elastic sliding mechanism facilitates resetting. Multiple cams 503 are fixedly mounted on the surfaces of the two clamping plates 202 that are close to each other. Each positioning wheel 3 has a cam 503 inserted within it, allowing the positioning wheel 3 to rotate relative to the cam 503. The cam 503 has a large end and a small end. The large end of the cam 503 is coaxial with the positioning wheel 3, while the small end extends radially and forms a stop with the inner end of the sliding rod 501, causing the sliding rod 501 to move outwards. Simultaneously, the first spring 502 is compressed. When the small end of the cam 503 misaligns with the inner end of the sliding rod 501, the first spring 502 is released, simultaneously causing the sliding rod 501 to move inwards, achieving resetting. When there are eight positioning wheels 3, there are correspondingly eight cams 503.

[0075] Multiple sliding racks 504 are inserted into the circumferential sidewall of each positioning wheel 3. Multiple sliding gears 603 on the same positioning wheel 3 are arranged circumferentially and correspond to the friction roller group, all located inside the friction roller group. The sliding rack 504 is a strip-shaped arc-shaped plate structure, extending parallel to the axis of the positioning wheel 3 and coaxially arranged with it. A second spring 505 connects each sliding rack 504 to the positioning wheel 3. The second spring 505 extends parallel to the axis of the positioning wheel 3 and is opposite to the sliding rod 501. Under the action of the second spring 505, the sliding rack... 504 can slide elastically in a direction parallel to the axis of the positioning wheel 3; multiple arc-shaped toothed protrusions 5041 are provided on the outer plate surface of the sliding rack 504, the arc-shaped toothed protrusions 5041 and the sliding rack 504 are coaxially arranged, the multiple arc-shaped toothed protrusions 5041 are arranged at equal intervals along the axial direction of the positioning wheel 3, and can form a transmission engagement with the friction toothed protrusions 401; a first wedge surface 5011 is provided on the outer end of the sliding rod 501; a second wedge surface 5042 is provided on the axial sidewall of the sliding rack 504 near the sliding rod 501, the second wedge surface 5042 and the first wedge surface 5011 can abut to form a guiding engagement.

[0076] Initially, the friction tooth protrusion 401 is positioned facing inward.

[0077] During the rotation of the positioning wheel 3, after the sliding rod 501 and the small end of the cam 503 come into contact, the sliding rod 501 moves outward synchronously under the push of the small end of the cam 503 as the positioning wheel 3 rotates. Through the guiding cooperation between the second wedge surface 5042 and the first wedge surface 5011, the sliding rack 504 is driven away from the clamping plate 202. The second spring 505 is compressed, and the sliding rack 504 drives the friction roller 4 to rotate through the cooperation between the arc-shaped toothed protrusion 5041 and the friction toothed protrusion 401, causing the friction toothed protrusion 401 to rotate outward and then come into contact with the arch side wall of the steel arch frame 9. At this time, the friction between the friction toothed protrusion 401 and the groove side of the steel arch frame 9 is large. Subsequently, during the rotation of the positioning wheel 3, the positioning wheel 3 can be synchronously driven to rotate the steel arch frame 9 through friction locking to adjust the arc-shaped middle part of the steel arch frame 9 to align with the arc-shaped middle part of the tunnel, thereby ensuring the construction and installation quality. When the cam 503 and the sliding rod 501 are misaligned, the first spring 502 is released, which simultaneously drives the sliding rod 501 to move inward and achieve reset. After the first wedge surface 5011 and the second wedge surface 5042 are disengaged, the second spring 505 is released, which simultaneously drives the sliding rack 504 to approach the clamping plate 202. The sliding rack 504 drives the friction roller 4 to rotate through the engagement between the arc-shaped toothed protrusion 5041 and the friction toothed protrusion 401, causing the friction toothed protrusion 401 to rotate inward and then disengage from the arch side wall of the steel arch frame 9.

[0078] Furthermore, the transmission assembly 6 is configured to include an external gear ring 601, with an external gear ring 601 fixedly sleeved on each positioning wheel 3. The external gear ring 601 and the sliding rod 501 are located on the same side of the positioning wheel 3. A transmission belt 602 is connected between the external gear rings 601 on adjacent positioning wheels 3 in the same group. A gear 603 is provided on the lower plate surface of the upper clamping plate 202. The gear 603 can rotate around its own axis and slide in the radial direction of the positioning wheel 3, and can mesh with the outermost external gear ring 601 in the same group. When the gear 603 rotates, it can drive multiple positioning wheels 3 in the same group to rotate synchronously and in the same direction through the external gear ring 601 and the transmission belt 602.

[0079] To facilitate the provision of driving force for the rotation of gear 603, a first driving component is provided on the upper plate surface of the upper clamping plate 202. Taking the first driving component as a first driving motor 604 as an example, the motor shaft of the first driving motor 604 is set downward and passes through the upper clamping plate 202, and is fixedly inserted into the gear 603. A sliding groove 2021 is provided on the plate surface of the upper clamping plate 202, and the sliding groove 2021 extends horizontally in the front-back direction. When the first driving motor 604 is installed, the motor shaft is slidably inserted into the sliding groove 2021. To facilitate the provision of driving force for the gear 603 to slide in the radial direction, a second driving member is provided on the upper plate surface of the upper clamping plate 202. The second driving member can be configured as a first driving cylinder 605. The output shaft of the first driving cylinder 605 is horizontal and forward-facing, and is fixed on the first driving motor 604. When the output shaft of the first driving cylinder 605 extends, it drives the gear 603 away from the outer gear ring 601. When the output shaft of the first driving cylinder 605 retracts, it drives the gear 603 closer to the outer gear ring 601.

[0080] It is understandable that the first drive cylinder 605 can be configured as any one of a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder.

[0081] Initially, gear 603 is positioned away from external gear ring 601 and disengaged from external gear ring 601 to avoid affecting the free rotation of positioning wheel 3 and to ensure that positioning wheel 3 can be inserted into the arch groove of steel arch frame 9.

[0082] During use, when the steel arch frame 9 reaches the installation position at the top of the tunnel, if the arc-shaped middle of the steel arch frame 9 is not aligned with the arc-shaped middle of the tunnel, the first drive cylinder 605 is activated, the output shaft of the first drive cylinder 605 retracts, and synchronously drives the gear 603 to approach the positioning wheel 3; when the gear 603 and the external gear ring 601 mesh, the first drive motor 604 is activated, and the first drive motor 604 synchronously drives the gear 603 to rotate. The gear 603 drives multiple positioning wheels 3 in the same group to rotate synchronously and in the same direction through the external gear ring 601 and the transmission belt 602.

[0083] In other embodiments, the friction roller 4 has a structure that is thicker in the middle and thinner at both ends. This design is because the sidewalls of the arch groove of the steel arch frame 9 have natural arc-shaped transition characteristics due to processing techniques (such as I-beam rolling and grating steel arch welding), and are not absolutely flat vertical surfaces. The structure of the friction roller 4, which is thicker in the middle and thinner at both ends, allows the circumferential sidewall of the friction roller 4 to form a curved surface contact with the sidewall of the arch groove of the steel arch frame 9 with a higher degree of fit. Compared with the friction roller with a constant diameter cylindrical structure, the variable diameter structure can avoid the problems of "contact at both ends and suspension in the middle" or "contact in the middle and gap at both ends" caused by the arc transition of the sidewall of the arch groove. This ensures that when the friction roller 4 contacts the sidewall of the arch groove, its effective contact area is concentrated in the middle region, and the contact pressure distribution is more uniform, providing a stable contact basis for subsequent friction transmission and position fine adjustment.

[0084] In other embodiments, to further improve the quality of the steel arch frame 9 during assembly, the support mechanism for the bidirectional expansion of the surrounding rock of the undersea tunnel shield dismantling tunnel also includes two first telescopic rods 7 and two positioning seats 8. The two first telescopic rods 7 are symmetrically arranged about the left and right sides of the vehicle body 1, and their fixed ends are hinged to the vehicle body 1 and can rotate around a vertical line. The first telescopic rods 7 extend in the horizontal direction and can extend and retract. Each sliding end of the first telescopic rod 7 is provided with a positioning groove 701. The positioning groove 701 is an inverted Y-shaped structure, and the main groove and the branch groove located on the rear side coincide and are located on the same vertical line. The two positioning seats 8 are detachably set at both ends of the steel arch frame 9 by bolt and nut assemblies. The positioning seat 8 is a T-shaped plate structure. Two insert rods 801 are vertically and fixedly arranged on the inner plate surface of the vertical plate of the positioning seat 8. The two insert rods 801 are arranged at intervals in the vertical direction.

[0085] During use, firstly, extend the two first telescopic rods 7 to a suitable length; this suitable length is such that the sliding end of the first telescopic rod 7 approximately coincides with the formed steel arch frame 9; then rotate the two first telescopic rods 7 respectively to make a suitable included angle between them; this suitable included angle is such that the sliding end of the two first telescopic rods 7 approximately coincides with the end of the formed steel arch frame 9 respectively; then fix the horizontal plate of one of the positioning seats 8 to the non-connecting end of the first section of the steel arch frame 9 using a bolt and nut assembly; then keep the first section of the steel arch frame 9 in a vertical state and ensure that the two insert rods on the positioning seat 8 are in a vertical position. The main slots of 801 and positioning slot 701 correspond; then the first section of steel arch frame 9 is moved from top to bottom, so that the lower insertion rod 801 on the positioning seat 8 is inserted into the end of the rear branch slot, and the upper insertion rod 801 is inserted into the junction of the main slot and the branch slot; then the first section of steel arch frame 9 is rotated forward to a horizontal state, and the upper insertion rod 801 on the positioning seat 8 is simultaneously inserted into the end of the front branch slot; at this time, the position of the first section of steel arch frame 9 is locked; then, with the first section of steel arch frame 9 as a reference, other sections of steel arch frame 9 are assembled in sequence, thereby improving the quality of the steel arch frame 9 assembly and ensuring the fit with the shape of the tunnel top.

[0086] When it is necessary to rotate the steel arch frame 9 to a vertical position, the movement of the insertion rod 801 is reversed compared to the above process to avoid motion interference.

[0087] In other embodiments, to improve the applicability of the equipment, the curvature of multiple positioning wheels 3 configured in the same positioning wheel group can be adjusted according to the curvature of the steel arch frame 9, thereby enabling the assembly and installation of steel arch frames 9 with different curvatures.

[0088] Specifically, in this embodiment, multiple third drive cylinders are arranged on the surfaces of the two clamping plates 202 that are close to each other. The output shafts of the third drive cylinders are arranged facing forward, and a connecting ring is fixedly arranged on the output shaft of the third drive cylinder. The connecting ring and the positioning wheel 3 are coaxial and rotatably connected, ensuring that the positioning wheel 3 can be driven to move in the front-back direction while avoiding affecting the rotation of the positioning wheel 3. Thus, by adjusting the misalignment distance between the multiple positioning wheels 3 in the same positioning wheel group in the front-back direction, the curvature of the multiple positioning wheels 3 in the same positioning wheel group can be changed, thereby adapting to steel arch frames 9 with different curvatures.

[0089] Understandably, the third drive cylinder can be any of the following: a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder.

[0090] In another embodiment of the present invention, a method for bidirectional expansion excavation of a submarine tunnel shield dismantling tunnel is also provided, which employs a surrounding rock support mechanism for bidirectional expansion excavation of a submarine tunnel shield dismantling tunnel using a steel arch frame 9 to support the tunnel; the method for bidirectional expansion excavation of a submarine tunnel shield dismantling tunnel includes the following steps:

[0091] S1: The main tunnel is constructed with the normal cross-section facing forward. Construction is stopped after the tunnel location is dismantled at a predetermined distance.

[0092] Specifically, the preset distance is beyond the endpoint of the detour guide.

[0093] S2: A detour pilot tunnel is set up and constructed on one side of the main tunnel;

[0094] Specifically, the net distance between the detour pilot tunnel and the main tunnel should meet the requirements of the "Railway Tunnel Design Code" (TB 10003). The distance between the opening and end point of the detour pilot tunnel and the two ends of the dismantling tunnel should not be less than twice the excavation width of the main tunnel.

[0095] S3: Based on the survey data, geophysical exploration and drilling methods are used to verify the geological conditions at the location of the dismantling tunnel;

[0096] Specifically, verifying the geological conditions at the location of the dismantling tunnel can ensure geological accuracy and provide a basis for the support design of the dismantling tunnel.

[0097] S4: Backfill the area below the pre-designed dismantling tunnel with tunnel slag, forming a construction ramp on one side and completely sealing off the other side;

[0098] Specifically, the slope of the ramp should be determined based on the climbing ability of the construction equipment (generally not exceeding 20%), and the top of the ramp should be located at 1 / 4 to 1 / 2 of the distance from the dismantling hole. The sealing thickness of the fully enclosed side should not be less than 3m.

[0099] S5: The slope side is widened by top-lifting excavation according to the designed support parameters;

[0100] Specifically, when the top is reached at the designed elevation of the dismantling tunnel, horizontal excavation continues forward until the designed location of the dismantling tunnel is reached. During excavation, a reasonable cyclic advance should be adopted according to the surrounding rock grade: no more than 4m in Class II and III surrounding rock sections, no more than the spacing of 3 steel frames in Class IV surrounding rock sections, and no more than the spacing of 2 steel frames in Class V surrounding rock sections. The excavation height should not exceed 8m in Class II and III surrounding rock sections, and no more than 4m in Class IV and V surrounding rock sections.

[0101] S6: Move vehicle body 1 to the bottom of the tunnel; then place the first steel arch frame 9 and the second steel arch frame 9 on vehicle body 1, and then rotate the clamp 2 so that the two positioning wheel sets are inserted into the upper and lower arch grooves of the steel arch frame 9 respectively, and are located at the junction of the first steel arch frame 9 and the second steel arch frame 9. Then fix the first steel arch frame 9 and the second steel arch frame 9 together; repeat the steps of placing the Nth steel arch frame 9, rotating the clamp 2, and fixing the adjacent steel arch frame 9 until the steel arch frame 9 is formed, where N is a natural number greater than or equal to three; then move the clamp 2 to the middle of the two positioning wheel sets; then rotate the clamp 2 to make the steel arch frame 9 vertical, and then move the steel arch frame 9 to the installation position in the tunnel through the clamp 2, and then fix the steel arch frame 9 on the tunnel;

[0102] Specifically, when the chuck 2 is rotated, the second drive motor is started. The second drive motor drives the worm gear to rotate. The worm gear drives the worm wheel to rotate through the transmission between the worm gear and the worm wheel. The worm wheel drives the support 102 to rotate through the rotating shaft 1021. The support 102 drives the chuck 2 to rotate through the second telescopic rod 104. The chuck 2 drives the two positioning wheel sets to be inserted into the upper and lower arch grooves of the second section of steel arch frame 9 from the upper and lower sides of the arc-shaped structure, respectively, and moves to the junction of the first section of steel arch frame 9 and the second section of steel arch frame 9.

[0103] When the steel arch frame 9 is adjusted to a vertical position, the second drive cylinder 103 is activated, and the output shaft of the second drive cylinder 103 retracts, synchronously driving the second telescopic rod 104 to rotate upward. The second telescopic rod 104 synchronously drives the steel arch frame 9 to rotate through the clamp 2 and two positioning wheel sets, so that the steel arch frame 9 switches from a horizontal state to a vertical state. Then, the second telescopic rod 104 is extended, synchronously driving the steel arch frame 9 to move upward to the top of the tunnel through the clamp 2 and positioning wheel sets. Then, the steel arch frame 9 is fixed at the top of the tunnel, and subsequent support steps can be carried out.

[0104] S7: After the top excavation and support of the ramp side is completed, excavate and support downwards in layers to the preset height until the excavation conditions on the other side are met.

[0105] S8: Backfill the slag in the tunnel according to the method in S4, and expand the excavation from the other side until the excavation and support of the upper part of the tunnel are dismantled;

[0106] S9: Complete the excavation and support of the middle section from one side;

[0107] S10: Complete the excavation and support of the lower part from one side.

[0108] Specifically, step S10 includes excavating and supporting the bottom from one side.

[0109] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A bidirectional expansion supporting mechanism for tunneling shield disassembled hole in seabed tunnel, characterized in that, The tunnel shield disassembly hole bidirectional expansion surrounding rock supporting mechanism comprises: A vehicle body; A chuck movably arranged on the vehicle body and configured to clamp a steel arch; two positioning wheel sets are arranged on the chuck and arranged in the up-down direction, and are respectively inserted into the upper and lower arch grooves of the steel arch during installation; each positioning wheel set comprises a plurality of positioning wheels, the positioning wheels in the same positioning wheel set are arranged in the circumferential direction, and the curvature of the positioning wheels is equal to the set curvature of the steel arch; the positioning wheels can rotate around their own axes; the wheel surface of the positioning wheel can roll with the groove side wall of the steel arch; A plurality of friction roller sets are inserted into the circumferential side wall of each positioning wheel, the friction roller sets on the same positioning wheel are arranged in the circumferential direction, each friction roller set comprises a plurality of friction rollers, the friction rollers in the same friction roller set are arranged in the axial direction of the positioning wheel, the axis of the friction roller is perpendicular to the axis of the positioning wheel, the friction roller can rotate around its own axis, and a plurality of friction teeth protrusions are arranged on each friction roller, the friction teeth protrusions extend in a direction parallel to the axis of the friction roller, the friction teeth protrusions on the same friction roller are arranged in the circumferential direction and cover half of the circumferential side wall of the friction roller; the tunnel shield disassembly hole bidirectional expansion surrounding rock supporting mechanism further comprises a transmission assembly and an adjusting assembly; the transmission assembly is configured to drive the positioning wheels in the same set to rotate synchronously and in the same direction; the adjusting assembly is configured to adjust the frictional contact between the friction teeth protrusions and the groove side wall of the steel arch when the positioning wheel rotates; The adjusting assembly comprises a sliding rod, a plurality of sliding rods are inserted into each positioning wheel, the sliding rods in the same positioning wheel are arranged in the circumferential direction, the sliding rods extend in the radial direction of the positioning wheel and can elastically slide in the radial direction of the positioning wheel; a plurality of cams are fixedly arranged on the chuck, the cams are inserted into each positioning wheel, and the cams can form a stop cooperation with the sliding rods; a plurality of sliding racks are inserted into the circumferential side wall of each positioning wheel, the sliding racks on the same positioning wheel are arranged in the circumferential direction, the sliding racks extend in a direction parallel to the axis of the positioning wheel and can elastically slide in the direction of extension, and the sliding racks can form a transmission cooperation with the friction teeth protrusions on the friction rollers in the same positioning wheel and form a guide cooperation with the sliding rods; The transmission assembly comprises an outer gear ring, an outer gear ring is sleeved on each positioning wheel, and a transmission belt is transmissionally sleeved between the outer gear rings of the same set and adjacent positioning wheels; a gear is further arranged on the chuck, the gear can rotate around its own axis, can slide in the radial direction of the positioning wheel, and can engage with the outer gear ring located at the outermost side in the same set.

2. The bidirectional expansion surrounding rock supporting mechanism for shield disassembled tunneling of an undersea tunnel according to claim 1, characterized in that, The transmission assembly further comprises a first driving member configured to provide a driving force for the rotation of the gear.

3. The bidirectional expansion surrounding rock supporting mechanism for shield disassembled tunneling of an undersea tunnel according to claim 1, characterized in that, The transmission assembly further comprises a second driving member configured to provide a driving force for sliding the gear in a radial direction.

4. The bidirectional tunneling shield disassembling hole rock supporting mechanism according to claim 1, wherein, The friction roller has a structure of thick in the middle and thin at both ends.

5. The bidirectional tunneling rock supporting mechanism for shield tunnel disassembly hole according to claim 1, characterized in that, The two-position tunnel shield disassembly hole bidirectional expansion surrounding rock supporting mechanism further comprises two first telescopic rods and two positioning seats, the two first telescopic rods are symmetrically arranged about the vehicle body, the fixed end of each first telescopic rod is hingedly connected to the vehicle body, the first telescopic rod can rotate about a vertical line, the end of the sliding end of each first telescopic rod is provided with a positioning groove, the positioning groove is in a reverse Y-shaped structure, and the main groove and one of the branch grooves are on the same vertical line, and the two positioning seats are detachably arranged at the two ends of the steel arch, each positioning seat is provided with two inserting rods, and the two inserting rods on the same positioning seat are respectively inserted into the two branch grooves of the positioning groove during installation.

6. The bidirectional tunneling rock supporting mechanism for shield tunnel disassembly hole according to claim 1, characterized in that, The curvature of the plurality of positioning wheels of the same positioning wheel group can be adjusted according to the curvature of the steel arch.

7. A method for bidirectional expansion construction of a shield tunnel disassembled hole, characterized in that, The two-position tunnel shield disassembly hole bidirectional expansion surrounding rock supporting mechanism adopts the steel arch to support the tunnel, and the two-position tunnel shield disassembly hole bidirectional expansion construction method comprises the following steps: S1: the normal section of the positive hole is used to forward construction, and the construction is stopped after a preset distance from the disassembly hole position; S2: a detour guide is arranged and constructed on one side of the positive hole; S3: combined with the survey data, the geological conditions of the disassembly hole position are verified by using geophysical prospecting and drilling methods; S4: the tunnel muck under the designed disassembly hole is backfilled, one side forms a construction ramp, and the other side is completely closed; S5: the ramp side is top-chosen and expanded according to the designed supporting parameters; S6: the vehicle body is moved to the lower part of the tunnel, the first steel arch and the second steel arch are placed on the vehicle body, the chuck is driven to rotate, the two positioning wheel groups are inserted into the upper and lower arch grooves of the steel arch and located at the junction of the first steel arch and the second steel arch, and the first steel arch and the second steel arch are fixedly connected; the steps of placing the Nth steel arch-chuck rotating-fixing adjacent steel arches are repeated until the steel arch is formed, N is a natural number greater than or equal to three; then the chuck is driven to move to the middle part of the steel arch where the two positioning wheel groups are located; then the chuck is driven to rotate, the steel arch is vertical, the steel arch is moved to the installation position of the tunnel through the chuck, and the steel arch is fixed on the tunnel; S7: after the top excavation and support of the ramp side are completed, the excavation and support are performed layer by layer downward to a preset height until the excavation and support of the other side meet the construction conditions; S8: the muck backfilling method of S4 is used to expand from the other side until the excavation and support of the upper part of the disassembly hole are completed; S9: the middle part of the excavation and support is completed from one side; S10: the lower part of the excavation and support is completed from one side.

Images