A reinforcing and restraining positioning and angle adjusting structure for large-diameter shield working well

Abstract

The utility model provides a kind of reinforcing and restraint positioning angle adjusting structure for large-diameter shield working well belongs to shield working well technical field, including multiple arc shells, multiple arc shells are sequentially spliced along circumference;The top of annular support structure is equipped with multiple stand columns, and multiple stand columns are fixed on the top of arc shell along annular track, and annular support structure is evenly connected with multiple layers of reinforcing arc column group by stand column;The inside of annular support structure is connected with annular gear, and the bottom of annular gear is connected with fixed shield structure by connecting rod;Fixed shield structure side is equipped with restraint half cover, and restraint space is formed between restraint half cover and fixed shield structure;The inside of annular reinforcing structure is equipped with driving device, and driving device is transmission connection with annular gear.The utility model forms combined support by annular reinforcing arc column etc., cooperates restraint half cover, spinning head and annular gear, realizes anti-impact, accurate positioning and automatic angle adjusting, can effectively reduce risk, improve construction efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of shield tunneling shaft technology, and in particular to a reinforcement and constraint positioning angle adjustment structure for large-diameter shield tunneling shafts. Background Technology

[0002] With the large-scale advancement of urban rail transit and integrated utility tunnel construction, large-diameter tunnel boring machines (TBMs) have become core equipment for deep and large tunnel construction due to their efficient tunneling capabilities. The weight of a single key component (such as the shield body and cutterhead) can reach hundreds of tons. The processes of hoisting, installation, initial positioning, and attitude adjustment pose stringent challenges to the structural safety, load adaptability, and operational convenience of the TBM working shaft. Traditional working shaft design concepts, centered on static soil support, lack a systematic response mechanism to dynamic construction loads, leading to frequent technical contradictions such as structural damage, operational risks, and efficiency bottlenecks in large-diameter TBM construction.

[0003] While existing conventional support systems for tunnel boring machine (TBM) shafts (such as diaphragm walls and cast-in-place piles with ring supports) can meet basic stability requirements under lateral soil pressure, they exhibit significant shortcomings when handling the lifting loads of large-diameter TBM components. Firstly, during hoisting, due to equipment operation errors and component inertial swaying, TBM components are prone to rigid collisions with the shaft sidewalls. Traditional support structures lack buffer and energy-absorbing designs, leading to anything from concrete cracking and steel corrosion to soil stress imbalance and excessive ground settlement. Secondly, existing structures lack integrated TBM positioning devices, resulting in a lack of spatial constraints during component descent. This necessitates repeated attitude adjustments by the crane, and in deeper shafts, blind spots and air disturbances further exacerbate positioning difficulties, leading to a high operational risk.

[0004] Furthermore, the need for fine-tuning the angle during the initial stage of tunnel boring machine (TBM) launch is difficult to meet with existing technologies. In traditional processes, TBM attitude correction relies on the coordinated operation of cranes and jacks, requiring multiple disassemblies of the reaction frame and propulsion system. Each adjustment is time-consuming, and human error can easily lead to excessive deviation of the axis from the design value. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing support systems, such as the lack of buffer energy absorption and positioning design, as well as large angle adjustment errors, and to provide a reinforcement and constraint positioning angle adjustment structure for large-diameter shield tunnel working shafts.

[0006] This utility model is achieved through the following technical solution: a reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunnel working shaft, comprising multiple arc-shaped shells, which are sequentially spliced ​​together circumferentially to form a complete annular support structure; multiple columns are provided on the top of the annular support structure, which are uniformly fixed to the top of the arc-shaped shells along an annular trajectory, and the annular support structure is uniformly connected to multiple layers of reinforced arc-shaped column groups through the columns, which together with the columns form a complete annular reinforcement structure; the reinforced arc-shaped column group includes multiple reinforced arc-shaped columns, and the multiple reinforced arc-shaped columns... The reinforced arc columns are respectively set in the space between two adjacent columns along a circular trajectory, and both ends of the reinforced arc columns are connected to the columns respectively; the inner side of the circular support structure is movably connected to a rotatable ring gear, and the bottom of the ring gear is connected to a fixed shield structure through a connecting rod; a constraint half-sleeve is provided on one side of the fixed shield structure, and the constraint half-sleeve and the fixed shield structure form a constraint space for placing the shield machine head; a driving device is provided on the inner side of the circular reinforcement structure, and the driving device is connected to the ring gear through transmission. The driving device can drive the ring gear to rotate to adjust the angle of the fixed shield structure.

[0007] This structure forms a three-dimensional support with the column through a multi-layered reinforced arc column group, which can greatly improve the load distribution capacity and the impact resistance, thereby effectively avoiding the problem of cracking of the working well sidewall due to collision; and the drive device directly controls the rotation of the ring gear, which can not only shorten the single angle adjustment time, but also improve the angle adjustment accuracy and reduce the risk of axis deviation caused by manual operation.

[0008] A further improvement of this utility model is that the column includes a hook-and-loop post and a recessed post, the hook-and-loop post and the recessed post are spliced ​​together, and the bottom of the hook-and-loop post and the recessed post are connected to the arc-shaped outer shell.

[0009] A further improvement of this utility model is that an L-shaped protrusion is provided on one side of the hook post, and an L-shaped groove adapted to the protrusion is provided on one side of the recessed post, wherein the protrusion and the groove form a joint structure for inserting and engaging.

[0010] A further improvement of this utility model is that the arc shell, together with the reinforcing arc column, hook column, and recessed column, forms a ring support acting on the upper half of the working shaft, and the constraint half-set, together with the fixed shield structure, forms a structure that constrains the middle part of the shield machine head and adjusts the lower angle of the shield machine head.

[0011] A further improvement of this utility model is that the fixed shield structure includes a first side plate and a second side plate arranged opposite to each other. The first side plate is connected to a connecting rod, and a rotating ring tooth is rotatably connected between the first side plate and the second side plate. The outer circumference of the rotating ring tooth is a sawtooth gear structure, and a driving mechanism is connected to the outer circumference of the rotating ring tooth, and the driving mechanism can drive the rotating ring tooth to rotate. The inner ring of the rotating ring tooth is an internal gear structure, and multiple half gears mesh with the inner ring of the rotating ring tooth. The half gears are connected to a spinning head, and the spinning head can rotate to press against the side of the shield machine head.

[0012] A further improvement of this utility model is that the spinning head has a spinning surface with gradually increasing thickness on the side near the shield machine head, and the spinning surface can press against the side of the shield machine head when it rotates.

[0013] A further improvement of this utility model is that the driving mechanism includes a driving gear and a driving motor fixed on the first side plate. The driving gear meshes with the outer serrations of the rotating ring gear, and the driving motor drives the driving gear to rotate so as to drive the rotating ring gear to rotate.

[0014] A further improvement of this utility model is that the constraint half-set includes a constraint shell that fits against the outer periphery of the tunnel boring machine head, and a constraint side plate is inserted into one side of the constraint shell. The constraint side plate is detachable to expose the installation space of the tunnel boring machine head.

[0015] As can be seen from the above technical solutions, the beneficial effects of this utility model are: 1. This structure forms a complete ring-shaped joint structure by connecting the reinforced arc columns, hook columns and recessed columns in a ring array. Together with the ring support composed of the arc shell, it evenly distributes the hoisting load, effectively resists impact, avoids the side wall of the working well from cracking due to collision, reduces the risk of soil collapse, and ensures construction safety.

[0016] 2. This structure, by constraining the space formed by the semi-set and the fixed shield structure, combined with the design of the spinning head rotating to press against the side of the shield machine head, can limit the spatial position of the shield machine head, reduce the swing amplitude during hoisting, reduce the probability of collision, facilitate positioning, improve installation efficiency and reduce operational risks.

[0017] 3. The ring gear described in this structure rotates through a combination of an electric drive device and gear transmission, thereby driving the fixed shield structure to adjust its angle. This eliminates the need for a crane, making angle adjustment convenient and precise, reducing manual operation errors, shortening the angle adjustment time, accelerating the construction progress, and meeting the high efficiency and precision requirements of large-diameter shield tunneling. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the connection structure of the reinforced arc column according to a specific embodiment of this utility model.

[0021] Figure 3 This is a schematic diagram of the fixed shield structure in a specific embodiment of this utility model.

[0022] Figure 4 This is a schematic diagram of the fixed shield structure on another axial side of a specific embodiment of this utility model.

[0023] Figure 5 This is an exploded view of the fixed shield structure of a specific embodiment of this utility model.

[0024] Figure 6 This is a schematic diagram of the connection structure between the spinning head and the half gear in a specific embodiment of this utility model.

[0025] In the diagram: 1. Annular reinforcement structure; 101. Reinforced arc column; 2. Hook and clamp column; 201. Protruding head; 3. Recessed column; 301. Groove; 4. Annular support structure; 401. Arc shell; 5. Ring gear; 6. Connecting rod; 7. Fixed shield structure; 701. First side plate; 702. Second side plate; 703. Rotating ring tooth; 704. Drive gear; 705. Drive motor; 706. Half gear; 707. Spinning head; 708. Spinning surface; 8. Constraint half set; 801. Constraint shell; 802. Constraint side plate; 9. Drive device; 10. Shield machine head. Detailed Implementation

[0026] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0027] Now refer to Figure 1 — Figure 6The following is a description of a specific embodiment: The present invention provides a reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling shaft, comprising multiple arc-shaped outer shells 401. These arc-shaped outer shells 401 are sequentially spliced ​​together circumferentially to form a complete annular support structure 4. Multiple columns are provided at the top of the annular support structure 4. These columns are uniformly fixed to the top of the arc-shaped outer shells 401 along an annular trajectory. The annular support structure 4 is also uniformly connected to multiple layers of reinforced arc-shaped column groups via these columns. These reinforced arc-shaped column groups and the columns form a complete annular reinforcement structure 1. Each reinforced arc-shaped column group includes multiple reinforced arc-shaped columns 101. The reinforcing arc column 101 is set in the space between two adjacent columns along a circular trajectory, and both ends of the reinforcing arc column 101 are connected to the columns respectively; the inner side of the annular support structure 4 is movably connected to a rotatable ring gear 5, and the bottom of the ring gear 5 is connected to a fixed shield structure 7 through a connecting rod 6; a constraint half-sleeve 8 is provided on one side of the fixed shield structure 7, and the constraint half-sleeve 8 and the fixed shield structure 7 form a constraint space for placing the shield machine head 10; a driving device 9 is provided on the inner side of the annular reinforcing structure 1, and the driving device 9 is connected to the ring gear 5 through transmission. The driving device 9 can drive the ring gear 5 to rotate in order to adjust the angle of the fixed shield structure 7.

[0028] Multiple arc-shaped outer shells 401 are circumferentially spliced ​​to form a ring support structure 4. The top column serves as a load-bearing node, uniformly connecting multiple layers of the reinforced arc column group to form a spatial grid-like ring reinforcement structure 1, which transfers the hoisting load to the arc-shaped outer shell 401 and the surrounding soil through the column. The ring gear 5 is driven by the drive device 9 and rotates inside the ring support structure 4, driving the fixed shield structure 7 to adjust its angle through the connecting rod 6. Combining existing electric motor transmission technology, the drive device 9 includes an electric motor drive device and a gear transmission device. The electric motor drive device drives the ring gear 5 to rotate through the gear transmission device, thereby adjusting the angle of the fixed shield structure 7. When the shield machine head 10 is lowered into the constrained space, the constrained half-set 8 and the fixed shield structure 7 form a horizontal limit, restricting its swing amplitude.

[0029] This structure forms a three-dimensional support with the column through the multi-layer reinforced arc column group, which can greatly improve the load distribution capacity and the impact resistance, thereby effectively avoiding the problem of cracking of the working well sidewall due to collision; and the drive device 9 directly controls the rotation of the ring gear 5, which can not only shorten the single angle adjustment time, but also improve the angle adjustment accuracy and reduce the risk of axis deviation caused by manual operation.

[0030] Specifically, refer to Figure 2 The column includes a hook post 2 and a recessed post 3, which are spliced ​​together, and the bottom of both the hook post 2 and the recessed post 3 are connected to the arc shell 401.

[0031] The column is composed of hook column 2 and recessed column 3 spliced ​​together, and the bottom is fixedly connected to the arc shell 401 to form the top load-bearing support point of the ring support structure 4; the reinforced arc column group is circumferentially connected through the column, and the hoisting load is transferred to the arc shell 401 through the column, and then evenly distributed to the surrounding soil.

[0032] This structure utilizes the prefabricated production of hook-and-clamp columns 2 and recessed columns 3, allowing for rapid on-site assembly via snap-fit ​​connections. This improves installation efficiency, reduces high-altitude work time, and adapts to the urgent construction needs of large-diameter working shafts. Simultaneously, the columns, as centralized force transmission components, shorten the load transfer path, enhance the overall structural rigidity, and ensure safe transport of tunnel boring machine components.

[0033] Specifically, refer to Figure 1 and Figure 2 The arc shell 401, together with the reinforcing arc column 101, hook column 2, and recessed column 3, forms an annular support acting on the upper half of the working shaft. The constraint half-set 8 and the fixed shield structure 7 form a structure that constrains the middle part of the shield head 10 and adjusts the lower angle of the shield head 10.

[0034] The arc shell 401, the reinforced arc column 101, the hook column 2, and the recessed column 3 form a ring support for the upper half of the working shaft, resisting the lateral pressure of the soil and the impact of hoisting; the middle constraint half 8 restricts the horizontal displacement of the shield machine head through the constraint space, and the lower fixed shield structure 7 achieves attitude calibration through the ring gear angle adjustment, forming a full-process protection system of "upper load-middle constraint-lower control".

[0035] This structure, through its upper support system design, can control the wall displacement caused by soil lateral pressure within a small range, and reduce the central constraint to reduce the swing amplitude of the shield machine head 10 during hoisting and improve the lower angle adjustment accuracy, which can effectively reduce the incidence of safety accidents. At the same time, this structure replaces multiple sets of existing support, positioning, and angle adjustment equipment, greatly reducing equipment investment costs and lowering the overall construction cost.

[0036] Specifically, refer to Figure 3 — Figure 6 The fixed shield structure 7 includes a first side plate 701 and a second side plate 702 arranged opposite to each other. The first side plate 701 is connected to the connecting rod 6, and a rotating ring tooth 703 is rotatably connected between the first side plate 701 and the second side plate 702. The outer circumference of the rotating ring tooth 703 is a sawtooth gear structure, and a driving mechanism is connected to the outer circumference of the rotating ring tooth 703. The driving mechanism can drive the rotating ring tooth 703 to rotate. The inner ring of the rotating ring tooth 703 is an internal gear structure, and multiple half gears 706 mesh with the inner ring of the rotating ring tooth 703. The half gears 706 are connected to a spinning head 707, and the spinning head 707 can rotate to press against the side of the shield machine head 10.

[0037] The first side plate 701 is connected to the ring gear 5 via the connecting rod 6. The second side plate 702 is fixed to the outside of the first side plate. The rotating ring gear 703 is rotatably connected between the two via a bearing. The driving mechanism drives the outer circumferential saw teeth of the rotating ring gear to rotate. The inner ring gear synchronously drives multiple half gears 706 to rotate, so that the spinning head 707 rotates around the axis and presses against the side of the shield machine head.

[0038] This structure, through the linkage of multiple half-gears 706 to drive the spinning head 707, can ensure that the circumferential pressure of the tunnel boring machine head is evenly distributed, reduce fixing errors, and avoid equipment deformation caused by single-point force. In addition, the direct transmission of the gear system has low power loss, which can shorten the pressure response time of the spinning head 707, thereby improving the hydraulic transmission efficiency and ensuring rapid positioning.

[0039] In one embodiment, reference Figure 1 and Figure 2 The hook post 2 has an L-shaped protrusion 201 on one side and an L-shaped groove 301 on one side that matches the protrusion 201. The protrusion 201 and the groove 301 form a joint structure for inserting and engaging.

[0040] The L-shaped protrusion 201 of the hook post 2 is inserted into the L-shaped groove 301 of the recessed post 3 to form a mechanically interlocked plug-in joint structure. Multiple sets of posts are spliced ​​together in a circumferential manner through this structure to form a continuous load-bearing belt, which together bears the circumferential shear force and axial pressure.

[0041] This structure, through its L-shaped contact surface design, effectively increases the shear area, improves shear strength, and avoids structural failure due to local stress concentration at the connection point. Furthermore, this plug-in joint structure eliminates the need for welding or bolt connections; the columns can be assembled solely through mechanical plug-in, shortening installation time and reducing construction costs and safety risks.

[0042] Specifically, refer to Figure 3 The constraint half-set 8 includes a constraint shell 801 that fits against the outer periphery of the shield machine head 10. A constraint side plate 802 is inserted into one side of the constraint shell 801. The constraint side plate 802 is detachable to expose the installation space of the shield machine head 10.

[0043] The inner circumferential curved surface of the constraint shell 801 is prefabricated according to the shape of the shield machine head. When lowering, the curved surface fits to provide initial positioning and reduce errors. Furthermore, when installing components, the plug-in constraint side plate 802 is removed to expose the operating space. After installation, it is reinserted and locked to form a complete constraint space.

[0044] This structure, through its curved surface fitting design, can solve the problem of blind spots in working shafts with depths exceeding 40 meters, improve the success rate of first-time positioning of the tunnel boring machine head 10, and reduce the number of crane adjustments. Furthermore, through this constraint side plate plug-in design, it can shorten the disassembly or installation time, improve connection efficiency, thereby shortening the time of key processes and accelerating the construction progress.

[0045] In one embodiment, reference Figure 6 The spinning head 707 has a spinning surface 708 with gradually increasing thickness on the side near the shield machine head 10. When the spinning surface 708 rotates, it can press against the side of the shield machine head 10.

[0046] The spinning head 707 has a spinning surface 708 with a conical surface design where the thickness gradually increases from near to far. When rotating, the thickness changes to generate an increasing radial resistance force. When the spinning surface rotates to a specific angle, the part with the maximum thickness completely fits the curved surface of the tunnel boring machine head, achieving gapless fixation.

[0047] This structure, through the aforementioned spinning head design, is adaptive to multiple specifications and can be compatible with shield machine heads 10 of various diameters. Furthermore, by adjusting the rotation angle to change the pressing position, no hardware replacement is required, which can effectively improve versatility. At the same time, the axial component force generated by this conical surface can pre-tighten the shield machine head 10 to the constraint shell 801, and in conjunction with radial limiting, form a double fixation in the horizontal and vertical directions, improving the fixation reliability.

[0048] In one embodiment, reference Figure 5 and Figure 6 The driving mechanism includes a driving gear 704 and a driving motor 705 fixed on the first side plate 701. The driving gear 704 meshes with the outer circumferential sawtooth of the rotating ring tooth 703. The driving motor 705 drives the driving gear 704 to rotate so as to drive the rotating ring tooth 703 to rotate.

[0049] The drive motor 705 reduces the speed and amplifies the torque through a reducer, driving the drive gear 704 to mesh with the outer serrations of the rotating ring gear 703, causing the rotating ring gear 703 to rotate at a low speed; the half gear 706 meshes with the inner ring gear of the rotating ring gear, synchronously driving the spinning head 707 to rotate.

[0050] This structure, through the stepless speed regulation characteristic of the motor, can precisely control the pressing speed of the spinning head 707, avoiding damage to the shield machine head 10 caused by rigid impact; at the same time, through the torque sensor configured in this gear system, when the pressing force exceeds the set threshold, it can quickly and automatically stop the machine, and the equipment protection response speed is fast, thereby reducing maintenance costs.

[0051] When hoisting the tunnel boring machine head 10, the upper half of the working shaft is protected by the aforementioned enclosure. Simultaneously, when the tunnel boring machine head 10 falls to the lower half, the space between the constraint side plate 802 and the second side plate 702 protects it and restricts its space, facilitating placement. When it falls to the bottom of the constraint shell 801, the drive motor 705 rotates, causing the rotating ring gear 703 to rotate, which in turn rotates the multiple half gears 706, causing the spinning head 707 to rotate. This further rotates the spinning surface 708, gradually bringing it closer to and into contact with one side of the tunnel boring machine head 10, achieving pressure fixation. This reduces the difficulty of hoisting and minimizes safety hazards.

[0052] Meanwhile, to achieve angle adjustment, the ring gear 5 has an internal sawtooth structure. The inner ring of the ring gear 5 houses a drive device 9, which is a combination of an electric motor drive and a gear transmission device. A high-power electric motor is used as the power source. The output shaft of the motor is connected to a reducer via a coupling. The reducer lowers the high speed of the motor while increasing the output torque. The output shaft of the reducer is then connected to the gear ring on the ring gear 5 through a series of gear transmission devices. When the electric motor rotates, the power is transmitted to the ring gear 5 through the reducer and gear transmission, causing the ring gear 5 to rotate. This allows for adjustment of the tunnel boring machine's drilling angle, avoiding the need for a crane during movement, reducing safety hazards, improving convenience, and facilitating subsequent adjustments based on actual conditions.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling shaft, comprising multiple arc-shaped outer shells (401), characterized in that, Multiple arc shells (401) are sequentially spliced ​​together circumferentially to form a complete annular support structure (4); multiple columns are provided on the top of the annular support structure (4), and the multiple columns are uniformly fixed to the top of the arc shells (401) along the annular trajectory. The annular support structure (4) is uniformly connected to multiple layers of reinforced arc column groups through the columns. The reinforced arc column groups and the columns form a complete annular reinforcement structure (1); the reinforced arc column group includes multiple reinforced arc columns (101), and the multiple reinforced arc columns (101) are respectively arranged in the space between two adjacent columns along the annular trajectory. The two ends of the reinforced arc columns (101) are... Each is connected to a column; the inner side of the annular support structure (4) is movably connected to a rotatable annular gear (5), and the bottom of the annular gear (5) is connected to a fixed shield structure (7) via a connecting rod (6); a constraint half-sleeve (8) is provided on one side of the fixed shield structure (7), and a constraint space for placing the shield machine head (10) is formed between the constraint half-sleeve (8) and the fixed shield structure (7); a driving device (9) is provided on the inner side of the annular reinforcement structure (1), and the driving device (9) is connected to the annular gear (5) for transmission. The driving device (9) can drive the annular gear (5) to rotate in order to adjust the angle of the fixed shield structure (7).

2. The reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling working shaft according to claim 1, characterized in that, The column includes a hook post (2) and a recessed post (3), which are spliced ​​together, and the bottom of the hook post (2) and the recessed post (3) are connected to the arc shell (401).

3. The reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling working shaft according to claim 2, characterized in that, The hook post (2) has an L-shaped protrusion (201) on one side, and the recessed post (3) has an L-shaped groove (301) on one side that matches the protrusion (201). The protrusion (201) and the groove (301) form a joint structure for inserting and engaging.

4. The reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling working shaft according to claim 2, characterized in that, The arc shell (401), together with the reinforced arc column (101), hook column (2), and recessed column (3), forms an annular support acting on the upper half of the working well. The constraint half-set (8) and the fixed shield structure (7) form a structure that constrains the middle part of the shield head (10) and adjusts the lower angle of the shield head (10).

5. The reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling working shaft according to claim 1, characterized in that, The fixed shield structure (7) includes a first side plate (701) and a second side plate (702) arranged opposite to each other. The first side plate (701) is connected to the connecting rod (6), and a rotating ring tooth (703) is rotatably connected between the first side plate (701) and the second side plate (702). The outer circumference of the rotating ring tooth (703) is a sawtooth gear structure. The outer circumference of the rotating ring tooth (703) is connected to a driving mechanism, and the driving mechanism can drive the rotating ring tooth (703) to rotate. The inner ring of the rotating ring tooth (703) is an internal gear structure. The inner ring of the rotating ring tooth (703) is meshed with a plurality of half gears (706). The half gears (706) are connected to a spinning head (707), and the spinning head (707) can rotate to press against the side of the shield machine head (10).

6. The reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling working shaft according to claim 5, characterized in that, The spinning head (707) has a spinning surface (708) with gradually increasing thickness on the side near the shield machine head (10). When the spinning surface (708) rotates, it can press against the side of the shield machine head (10).

7. The reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling shaft according to claim 6, characterized in that, The driving mechanism includes a driving gear (704) and a driving motor (705) fixed on the first side plate (701). The driving gear (704) meshes with the outer circumferential sawtooth of the rotating ring tooth (703). The driving motor (705) drives the driving gear (704) to rotate so as to drive the rotating ring tooth (703) to rotate.

8. The reinforcement and constraint positioning angle adjustment structure for a large-diameter shield tunneling working shaft according to claim 1, characterized in that, The constraint half-set (8) includes a constraint shell (801) that fits against the outer periphery of the shield machine head (10). A constraint side plate (802) is inserted into one side of the constraint shell (801). The constraint side plate (802) is detachable to expose the installation space of the shield machine head (10).

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