Lifting platform suitable for large-diameter shield tunnel reinforcement construction method main machine

Abstract

The utility model belongs to the technical field, and particularly relates to a lifting platform suitable for a large-diameter shield tunnel reinforcing construction method main machine. Comprising a base on which a bearing platform is arranged; the lifting supporting assembly comprises a plurality of sets of hydraulic cylinders and matched guide rods, and the guide rods and the hydraulic cylinders are arranged in parallel and installed on the base; a linear bearing is slidably arranged on the guide rod, a connecting plate is arranged on the linear bearing, the connecting plate is connected with the bearing platform, and a hydraulic cylinder is connected with the bottom of the connecting plate; and the self-locking mechanism is matched with the linear bearing on the guide rod and used for locking the linear bearing, and the self-locking mechanism comprises a locking piece matched with the linear bearing. Aiming at the technical problems, the utility model provides the lifting platform suitable for the large-diameter shield tunnel reinforcement construction method main machine, which can be used for self-locking a lifting structure and effectively improving the stability of the lifting platform.

Description

Technical Field

[0001] This utility model belongs to the technical field, and in particular relates to a lifting platform adapted to the main machine of the reinforcement method for large-diameter shield tunnels. Background Technology

[0002] In modern tunnel engineering construction, the application of large-diameter shield tunnels is becoming increasingly widespread. A standard TJS (Tunnel Boring Machine) mainframe can accommodate shield tunnels with an inner diameter of 5-5.5 meters. The mainframe's lifting and lowering operations are achieved by adjusting four retractable brackets to ensure the drill rod's central axis passes through the tunnel's center. However, when the shield tunnel diameter exceeds this range, reaching larger sizes such as 6 meters and above, or even 13-14 meters, the mainframe's volume remains constant. Therefore, for conventional TJS mainframes, relying solely on traditional bracket adjustments is insufficient to meet the lifting and lowering requirements. It becomes difficult to guarantee the drill rod's central axis passes through the tunnel's center, causing the drill rod to jam when passing through grouting holes for grouting, leading to drill rod problems. In this case, a specially designed lifting platform is needed to assist in the operation and overcome these problems, ensuring the drill rod's central axis passes through the tunnel's center (i.e., the drill rod's extension direction coincides with the radial direction of the tunnel circle).

[0003] Currently available lifting platforms on the market have certain defects in structural design and functional implementation. They lack effective self-locking functionality. During actual operation, when the TJS main unit is installed on the lifting platform for lifting operations, the main unit's significant weight exerts considerable pressure on the platform's hydraulic cylinders. Under this pressure, the hydraulic cylinders may retract, causing unexpected changes in the platform's height. This instability not only severely affects the lifting platform's positioning accuracy but also significantly interferes with workers' normal tunnel operations, increasing safety risks and quality hazards during construction, reducing construction efficiency, and failing to meet the stability and reliability requirements of large-diameter shield tunnel reinforcement operations. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a lifting platform adapted to the main machine of a large-diameter shield tunnel reinforcement method, which self-locks the lifting structure after the lifting platform is raised to a suitable position, thereby effectively improving the stability of the lifting platform.

[0005] In view of this, the present invention provides a lifting platform adapted to the main machine of the large-diameter shield tunnel reinforcement method, comprising:

[0006] The base has a support platform on it;

[0007] The lifting support assembly includes multiple sets of hydraulic cylinders and matching guide rods. The guide rods and hydraulic cylinders are arranged in parallel and mounted on the base. A linear bearing is slidably installed on the guide rod. A connecting plate is installed on the linear bearing and the connecting plate is connected to the bearing platform. The hydraulic cylinders are connected to the bottom of the connecting plate.

[0008] A self-locking mechanism, which engages with a linear bearing on a guide rod, is used to lock the linear bearing. The self-locking mechanism includes a locking element adapted to the linear bearing.

[0009] In the above technical solution, the locking element further includes:

[0010] External threads are provided on the outer surface of the linear bearing;

[0011] The locking sleeve has a through groove inside, and the locking sleeve is fitted onto the linear bearing through the through groove.

[0012] Internal thread, located in the inner diameter of the through groove of the locking sleeve, with internal thread and external thread in threaded engagement;

[0013] A threaded section is located at the lower part of the lock sleeve, and the threaded section has an installation groove that communicates with the through groove;

[0014] The nut cap is movably mounted on the threaded section, and the nut cap is threadedly engaged with the threaded section.

[0015] A connecting groove is provided at the bottom of the nut cover and is connected to the mounting groove and the through groove.

[0016] In any of the above technical solutions, a sealing structure is further provided in the mounting groove. The sealing structure includes a clamping member and a lip seal ring. The clamping member is located in the mounting groove, and the lip seal ring hugs the clamping member. The outer surface of the clamping member is provided with a groove, and the lip seal ring is placed in the groove and seals the mounting groove of the threaded section. The lower part of the lip seal ring and the clamping member extends out of the mounting groove and is located in the nut cover. After the nut cover is tightened, it clamps the lip seal ring and the clamping member.

[0017] In any of the above technical solutions, the hydraulic cylinder is further defined as a synchronous hydraulic cylinder, and multiple sets of hydraulic cylinders achieve synchronous lifting and lowering through a hydraulic control system.

[0018] In any of the above technical solutions, the supporting platform is further configured as a split structure, consisting of a main platform and multiple sub-platforms. The sub-platforms are equipped with telescopic structures, and the sub-platforms can be telescopically installed on both sides of the main platform through the telescopic structures.

[0019] In any of the above technical solutions, the telescopic structure further includes:

[0020] The bottom shell is located at the bottom of the main platform;

[0021] Guide rails are installed at the front and rear ends of the left and right sides inside the bottom shell;

[0022] The first slide rail is slidably mounted on the guide rail;

[0023] Sliding components are slidably disposed on both sides of the first slide rail;

[0024] The second slide rail is connected to the two sliding parts on the same side, and the second slide rail is connected to the bottom of the sub-platform on the same side.

[0025] In any of the above technical solutions, a guide component is further provided at the bottom of the main platform, the guide component including:

[0026] Guide grooves are formed inside the bottom shell on the left and right sides and the front and rear sides;

[0027] The guide plate is slidably installed in the guide groove and is fixedly connected to the sub-platform.

[0028] In any of the above technical solutions, a fixed seat is provided on the upper part of the sub-platform, and receiving grooves are provided on both sides of the fixed seat, with a guardrail fixed between the two receiving grooves.

[0029] The beneficial effects of this utility model are:

[0030] 1. Provide a stable, precise lifting and lowering, and effectively self-locking support platform for the TJS main unit when operating in large-diameter (beyond the conventional adjustment range) shield tunnels, solving the problem that the angle brace alone cannot meet the lifting requirements of the main unit due to the large tunnel diameter, and ensuring the smooth progress of main unit installation, lifting and lowering, and tunnel reinforcement operations;

[0031] 2. Through the cooperation of the self-locking mechanism, guide rod, and linear bearing, the main unit is locked after being raised and lowered to the correct position, preventing the hydraulic cylinder from retracting due to the weight of the main unit. This ensures the stability of the bearing platform, creates a safe and reliable working environment for workers, and improves the accuracy and efficiency of tunnel reinforcement construction.

[0032] 3. By utilizing the cooperation of guide rods, linear bearings, and connecting plates, the lifting and lowering of the bearing platform is precisely guided, and the hydraulic cylinder is used to achieve smooth lifting and lowering, so that the main unit can remain horizontal and stable when operating at different heights, meeting the requirements of shield tunnel reinforcement construction method for the positional accuracy of the main unit;

[0033] 4. By using the clamping parts and lip seals, the mounting groove of the locking sleeve thread section is sealed to prevent dust and impurities in the shield tunnel construction environment from entering the locking parts (such as the threaded joint between the linear bearing and the locking sleeve), thus avoiding thread jamming and wear caused by impurities and ensuring the long-term reliable operation of the locking and unlocking functions of the locking parts.

[0034] 5. By adjusting the extension and retraction of the sub-platform, the carrying platform can flexibly change its own specifications, which can meet the installation requirements of small TJS main units and also adapt to the size of large main units, thus improving the versatility of the lifting platform for different models of main units. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0036] Figure 2 This is a three-dimensional structural diagram of the lifting support component of this utility model;

[0037] Figure 3 This is a three-dimensional structural diagram of the self-locking mechanism of this utility model;

[0038] Figure 4 This is an exploded view of the self-locking mechanism of this utility model;

[0039] Figure 5 This is a three-dimensional structural diagram of the first type of telescopic structure of this utility model;

[0040] Figure 6 This is a schematic diagram of the second three-dimensional structure of the telescopic structure of this utility model;

[0041] The attached figures are labeled as follows: 1. Base; 2. Support platform; 21. Main platform; 22. Sub-platform; 3. Lifting support assembly; 31. Hydraulic cylinder; 32. Guide rod; 33. Linear bearing; 34. Connecting plate; 4. Self-locking mechanism; 41. External thread; 42. Locking sleeve; 43. Through groove; 44. Internal thread; 45. Threaded section; 46. Mounting groove; 47. Nut cap; 48. Connecting groove; 5. Sealing structure; 51. Anchoring element; 52. Lip seal ring; 53. Groove; 6. Hydraulic control system; 7. Telescopic structure; 71. Bottom shell; 72. Guide rail; 73. First slide rail; 74. Sliding element; 75. Second slide rail; 8. Guide assembly; 81. Guide groove; 82. Guide plate; 9. Fixed seat; 10. Receiving groove; 11. Guardrail. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0043] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0044] Example 1:

[0045] like Figures 1-4 As shown, this embodiment provides a lifting platform adapted to the main machine of the large-diameter shield tunnel reinforcement method, characterized in that it includes:

[0046] Base 1, on which a support platform 2 is provided;

[0047] The lifting support assembly 3 includes multiple sets of hydraulic cylinders 31 and matching guide rods 32. The guide rods 32 and hydraulic cylinders 31 are arranged in parallel and installed on the base 1. A linear bearing 33 is slidably provided on the guide rod 32. A connecting plate 34 is provided on the linear bearing 33 and the connecting plate 34 is connected to the bearing platform 2. The hydraulic cylinders 31 are connected to the bottom of the connecting plate 34.

[0048] The self-locking mechanism 4 cooperates with the linear bearing 33 on the guide rod 32 to lock the linear bearing 33. The self-locking mechanism 4 includes a locking element adapted to the linear bearing 33.

[0049] This technical solution provides a stable, precisely lifting, and effectively self-locking support platform for the TJS main unit during operation in large-diameter shield tunnels (beyond the conventional adjustment range). This solves the problem that corner braces alone cannot meet the lifting requirements of the main unit due to the large tunnel diameter, ensuring the smooth installation, lifting, and tunnel reinforcement operations of the main unit. Through the cooperation of the self-locking mechanism 4, guide rod 32, and linear bearing 33, the main unit locks in place after lifting, preventing the hydraulic cylinder 31 from retracting due to the main unit's weight. This ensures the height stability of the support platform 2, creating a safe and reliable working environment for workers and improving the accuracy and efficiency of tunnel reinforcement construction. The guide rod 32, linear bearing 33, and connecting plate 34 precisely guide the lifting of the support platform 2, and the hydraulic cylinder 31 achieves smooth lifting, allowing the main unit to remain horizontal and stable at different heights, meeting the positional accuracy requirements of shield tunnel reinforcement methods.

[0050] Working Principle: Hydraulic cylinder 31 is in its initial extension / retraction state, linear bearing 33 is in its corresponding initial position on guide rod 32, and the bearing platform 2 is positioned at a suitable low position above base 1. The locking element of self-locking mechanism 4 is in the open (unlocked) state. The hydraulic system supplies oil to hydraulic cylinder 31, causing the piston rod of hydraulic cylinder 31 to extend and push connecting plate 34 upward. Because connecting plate 34 is connected to linear bearing 33, linear bearing 33 slides upward synchronously along guide rod 32, causing bearing platform 2 to rise smoothly. During this process, guide rod 32 provides vertical guidance for linear bearing 33 (and bearing platform 2), ensuring accurate upward direction and preventing bearing platform 2 from tilting; multiple sets of hydraulic cylinders 31 work together to ensure that bearing platform 2 is evenly stressed and stably lifted. The hydraulic system controls hydraulic cylinder 31 to return oil, piston rod retracts, connecting plate 34 moves downward, and linear bearing 33 slides downward synchronously along guide rod 32, realizing the descent of bearing platform 2. Guide rod 32 also plays a role in vertical guidance and ensuring stability.

[0051] Once the support platform 2 has been raised or lowered to the target height (determined by a position detection device such as a limit switch or displacement sensor), the locking component engages with the linear bearing 33 on the guide rod 32. The mechanical structure engages or clamps the linear bearing 33, restricting its sliding along the guide rod 32. Because the connecting plate 34 is fixed to the linear bearing 33 and the hydraulic cylinder 31 is connected to the connecting plate 34, the locking of the linear bearing 33 fixes the position of the connecting plate 34. This prevents the piston rod of the hydraulic cylinder 31 from retracting due to the weight of the main unit, thus maintaining the stable height of the support platform 2 and providing reliable support for tunnel reinforcement operations. When further raising or lowering is required, the self-locking mechanism 4 unlocks, the locking component releases the linear bearing 33, and the raising or lowering process is repeated.

[0052] like Figures 1-4 As shown, in this embodiment, the optimized locking element includes:

[0053] External thread 41 is provided on the outer surface of linear bearing 33;

[0054] Lock sleeve 42, with a through groove 43 inside the lock sleeve 42, is sleeved on the linear bearing 33 through the through groove 43;

[0055] Internal thread 44 is provided in the inner diameter of the through groove 43 of the locking sleeve 42, and internal thread 44 is threadedly engaged with external thread 41;

[0056] A threaded section 45 is provided at the lower part of the locking sleeve 42, and the threaded section 45 is provided with an installation groove 46 that communicates with the through groove 43;

[0057] Nut cap 47 is movably mounted on threaded section 45, and nut cap 47 and threaded section 45 are threadedly engaged.

[0058] The connecting groove 48 is opened at the bottom of the nut cover 47 and is connected to the mounting groove 46 and the through groove 43.

[0059] In this technical solution, the threaded engagement between the external thread 41 of the linear bearing 33 and the internal thread 44 of the locking sleeve 42 allows for precise connection between the locking component and the linear bearing 33, ensuring a locking effect on the linear bearing 33. This stabilizes and restricts the position of the bearing platform 2, solving the problem of displacement of the bearing platform 2 due to the retraction of the hydraulic cylinder 31 caused by the weight of the main unit, which affects the operation. Utilizing the through groove 43 and connecting groove 48 of the locking sleeve 42, its position can be flexibly slid and adjusted on the guide rod 32 to adapt to locking scenarios with different height requirements. This facilitates quick connection between the locking component and the linear bearing 33 after the bearing platform 2 is adjusted to the appropriate position, improving the practicality and ease of operation of the lifting platform in large-diameter shield tunnel operations. After the locking sleeve 42 is tightened, it presses against the connecting plate 34, forming a rigid support from the linear bearing 33 to the connecting plate 34. This disperses and transmits the weight of the bearing platform 2 and the main unit through the locking structure, enhancing the overall structural stability and ensuring worker safety and tunnel reinforcement construction accuracy.

[0060] Working principle: All components of the locking mechanism are in a state of assembly or initial engagement: the locking sleeve 42 is fitted onto the linear bearing 33 through the through groove 43, at which point the internal thread 44 and the external thread 41 of the linear bearing 33 are not fully engaged; the nut cap 47 is movably positioned on the lower threaded section 45 of the locking sleeve 42, and the connecting groove 48 communicates with the through groove 43 and the mounting groove 46, allowing the entire locking mechanism to slide along the guide rod 32. The linear bearing 33 can drive the support platform 2 to move up and down along the guide rod 32 with the extension and retraction of the hydraulic cylinder 31. When the support platform 2 (equipped with the TJS main unit) is driven by the hydraulic cylinder 31 and moved up and down along the guide rod 32 to a suitable working height, the operator moves the locking mechanism, utilizing the compatibility between the connecting groove 48 and the guide rod 32, to slide the locking mechanism along the guide rod 32, aligning the locking sleeve 42 with the linear bearing 33, allowing the through groove 43 of the locking sleeve 42 to fit into the linear bearing 33, preparing for thread engagement. By rotating the locking sleeve 42 with a tool, the internal thread 44 of the locking sleeve 42 matches the external thread 41 of the linear bearing 33. As the locking sleeve 42 rotates relative to the linear bearing 33, it gradually screws into the external thread 41 of the linear bearing 33. During this screwing process, the locking sleeve 42 continuously moves towards the connecting plate 34. When the locking sleeve 42 is tightened, its end abuts against the connecting plate 34. At this point, the external thread 41 of the linear bearing 33 and the internal thread 44 of the locking sleeve 42 form a threaded lock, preventing the linear bearing 33 from sliding along the guide rod 32. After locking, the weight of the bearing platform 2 and the main unit is transmitted to the locking sleeve 42 through the connecting plate 34. The locking sleeve 42, relying on its threaded engagement with the linear bearing 33, distributes the force onto the linear bearing 33. The linear bearing 33 is limited by the guide rod 32, thereby restricting the displacement of the bearing platform 2. Even if the hydraulic cylinder 31 tends to retract under the weight of the host machine, it cannot move because the support platform 2 is restricted by the locking component, the linear bearing 33, and the guide rod 32. This avoids the problem of the hydraulic cylinder 31 retracting and affecting the operation, and achieves reliable self-locking and stable support.

[0061] Example 2:

[0062] This embodiment provides a lifting platform adapted to the main machine of the large-diameter shield tunnel reinforcement method. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0063] like Figure 3 and Figure 4 As shown, in this embodiment, the optimized installation groove 46 is provided with a sealing structure 5, which includes a clamping member 51 and a lip seal ring 52. The clamping member 51 is located in the installation groove 46, and the lip seal ring 52 hugs the clamping member 51. The outer surface of the clamping member 51 is provided with a groove 53, and the lip seal ring 52 is placed in the groove 53 and seals the installation groove 46 of the threaded section 45. The lower parts of the lip seal ring 52 and the clamping member 51 extend out of the installation groove 46 and are located in the nut cover 47. After the nut cover 47 is tightened, it clamps the lip seal ring 52 and the clamping member 51.

[0064] In this technical solution, the mounting groove 46 of the threaded section 45 of the locking sleeve 42 is sealed by the cooperation of the clamping member 51 and the lip seal ring 52, preventing dust and impurities in the shield tunnel construction environment from entering the interior of the locking member (such as the threaded engagement between the linear bearing 33 and the locking sleeve 42). This avoids thread jamming and wear caused by impurities, ensuring the long-term reliable operation of the locking and unlocking functions of the locking member. Utilizing the elasticity of the lip seal ring 52 and its cooperation with the clamping member 51 and the nut cover 47, the sealing effect on the connecting groove 48 is further enhanced after the nut cover 47 is tightened, forming a multi-layered sealing protection. This adapts to the complex and dusty harsh environment in tunnel construction, improving the overall durability and stability of the lifting platform. It reduces the erosion and damage of impurities to the locking member components (such as the threaded structure), maintains the accuracy of the threaded engagement between the locking sleeve 42 and the linear bearing 33, ensures stable clamping against the connecting plate 34 during locking, and continuously and effectively restricts the displacement of the bearing platform 2, providing reliable self-locking support for the TJS main unit operation.

[0065] Working principle: The clamping member 51 is placed in the mounting groove 46 of the locking sleeve 42, and the lip seal 52 is installed in the groove 53 on the outer surface of the clamping member 51. At this time, the lip seal 52 partially hugs the clamping member 51, and the lower parts of the lip seal 52 and the clamping member 51 extend out of the mounting groove 46. The nut cover 47 is movably sleeved on the threaded section 45 at the lower part of the locking sleeve 42. The connecting groove 48 is connected to the mounting groove 46 and the through groove 43, and the entire sealing structure 5 is in a state of waiting for sealing. When the locking member slides along the guide rod 32 and is sleeved into the linear bearing 33, completing the initial threaded engagement between the locking sleeve 42 and the linear bearing 33, the lip seal 52 outside the clamping member 51 relies on its own elasticity to initially fit the mounting groove 46 and the surrounding structure, forming a basic seal for the mounting groove 46 and preventing some large particles of dust and impurities from entering. After the locking sleeve 42 is tightened to abut against the connecting plate 34, thus locking the bearing platform 2, the operator tightens the nut cover 47. The nut cover 47 rotates upward along the threaded section 45 of the locking sleeve 42, gradually approaching the lip seal 52 and the abutment 51. When the nut cover 47 is tightened, its interior compresses the lower part of the lip seal 52 and the abutment 51, causing the lip seal 52 to deform further and fit tightly against the inner wall of the connecting groove 48 of the nut cover 47 and the surface of the abutment 51. At the same time, the abutment 51, after being compressed, also assists the lip seal 52 in enhancing the sealing effect, completely sealing the mounting groove 46 from the outside through the channel of the connecting groove 48, preventing dust and impurities from entering the threaded engagement of the locking component. The sealing structure 5 fixes the position of the lip seal 52 through the abutment 51, and uses the elastic deformation of the lip seal 52 to achieve dynamic sealing (adapting to possible slight displacement of the locking component). Then, the nut cover 47 is tightened to apply a preload, enhancing the sealing performance. While the locking mechanism self-locks the support platform 2, the sealing structure 5 continuously functions, protecting the internal components of the locking mechanism and ensuring stable locking function. This ensures that the lifting platform can operate reliably even in dusty environments during shield tunneling operations, providing stable support for the TJS main unit. When it is necessary to unlock and adjust the height of the support platform 2, simply loosen the nut cap 47 in the reverse direction. The lip seal ring 52 will elastically recover, releasing the sealing pressure. Then, loosen the locking sleeve 42 to proceed with subsequent operations. The sealing structure 5 can be repeatedly engaged to achieve sealing and protection.

[0066] Example 3:

[0067] This embodiment provides a lifting platform adapted to the main machine of the large-diameter shield tunnel reinforcement method. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0068] like Figure 1 As shown, in this embodiment, the optimized hydraulic cylinder 31 is a synchronous hydraulic cylinder 31, and multiple sets of hydraulic cylinders 31 achieve synchronous lifting and lowering through the hydraulic control system 6.

[0069] In this technical solution, the synchronous lifting of multiple sets of hydraulic cylinders 31 ensures uniform and synchronized movement of all support points on the support platform 2. This prevents the support platform 2 from tilting or warping due to asynchronous extension and retraction of the hydraulic cylinders 31, ensuring that the TJS main unit remains in a horizontal position and meeting the installation accuracy requirements of the main unit during tunnel reinforcement construction. Synchronous movement also ensures balanced force distribution on the hydraulic cylinders 31, reducing abnormal wear and leakage caused by uneven load on individual cylinders. This enhances the overall stability of the lifting platform structure and creates a safe and reliable environment for worker operation and main unit operation. In large-diameter tunnels, the main unit is large and its weight is widely distributed. The synchronous hydraulic cylinders 31 can precisely control the lifting height of the support platform 2, allowing the main unit to be stably positioned at different working heights. Combined with the guide rod 32 and linear bearing 33, this solves the problem that corner braces alone cannot meet the lifting requirements of the main unit in large-diameter tunnels.

[0070] Working Principle: The hydraulic control system 6 includes a synchronization valve (or synchronization circuit, such as a flow divider / combiner valve, servo control synchronization system, etc.), a hydraulic pump, hydraulic cylinders 31, pipelines, and detection feedback elements (such as displacement sensors and pressure sensors). Its basic logic is to control the flow rate and pressure of hydraulic oil entering / leaving multiple sets of hydraulic cylinders 31, causing the piston rods of the hydraulic cylinders 31 to extend and retract synchronously. When the hydraulic pump starts, hydraulic oil is delivered to the synchronization valve via pipelines. The synchronization valve, according to a preset synchronization control strategy (such as equal flow distribution), evenly distributes the hydraulic oil to the rodless chambers (or rod chambers, depending on the lifting direction) of the multiple sets of synchronous hydraulic cylinders 31. Because the flow rate and pressure of the oil entering each hydraulic cylinder 31 are consistent, under the action of hydraulic oil pressure, the piston rods of the hydraulic cylinders 31 extend synchronously, pushing the support platform 2 to rise smoothly. The displacement sensors monitor the extension length of the piston rods of each hydraulic cylinder 31 in real time. If there is a deviation, the synchronization valve automatically adjusts the oil distribution to correct the deviation and ensure synchronization accuracy. The hydraulic control system 6 controls the reversing, directing hydraulic oil flow to the rod chamber (or rodless chamber) of hydraulic cylinder 31. Simultaneously, the synchronization valve regulates the return oil flow, causing the piston rods of multiple hydraulic cylinders 31 to retract synchronously, smoothly lowering the support platform 2. Pressure sensors monitor system pressure to ensure stable pressure during the return oil process, preventing asynchronous retraction of hydraulic cylinders 31 due to uneven load (host weight, etc.). Displacement sensors also provide real-time position feedback to ensure descent synchronization. Taking a flow divider / combiner valve as an example, it can automatically divide (during ascent) or combine (during descent) the incoming hydraulic oil in equal amounts, ensuring that multiple hydraulic cylinders 31 receive the same flow rate of oil, achieving speed synchronization. If a servo control synchronization system is used, displacement sensors collect the piston rod position signals of each hydraulic cylinder 31 and feed them back to the servo controller. The controller compares the position differences and adjusts the opening of the corresponding electro-hydraulic proportional valve of the hydraulic cylinder 31 to precisely control the oil flow, keeping the piston rods synchronized in real time. This provides higher precision and can meet the stringent requirements for lifting accuracy in large-diameter tunnel operations. Through the coordination of synchronous hydraulic cylinder 31 and hydraulic control system 6, the lifting platform can stably and horizontally complete the lifting action of bearing platform 2 (and TJS main unit), providing reliable equipment support for shield tunnel reinforcement construction, solving the problem of main unit lifting in large-diameter tunnel operations, and ensuring construction safety and quality.

[0071] Example 4:

[0072] This embodiment provides a lifting platform adapted to the main machine of the large-diameter shield tunnel reinforcement method. In addition to the technical solutions of the above embodiments, it also has the following technical features.

[0073] like Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, in this embodiment, the optimized support platform 2 is a split structure, consisting of a main platform 21 and multiple sub-platforms 22. The sub-platforms 22 are equipped with telescopic structures 7, and the sub-platforms 22 are telescopically mounted on both sides of the main platform 21 through the telescopic structures 7.

[0074] In this technical solution, the telescopic adjustment of the sub-platform 22 allows the carrying platform 2 to flexibly change its specifications, meeting the installation requirements of small TJS main units as well as adapting to the size of large main units, thus improving the versatility of the lifting platform for different main unit models. The spatial layout and construction environment within large-diameter shield tunnels are complex and variable. The telescopic sub-platform 22 can be adjusted according to the actual conditions such as the distribution of obstacles and the width of the working passage within the tunnel, avoiding interference between the carrying platform 2 and the tunnel wall or other equipment, ensuring smooth operation of the lifting platform in confined spaces. The split telescopic structure 7 design allows the same lifting platform to be used in various working conditions, eliminating the need for customized equipment for different main units and working environments, reducing equipment procurement costs, and improving equipment utilization efficiency and economic benefits.

[0075] like Figure 2 , Figure 5 and Figure 6 As shown, in this embodiment, the optimized telescopic structure 7 includes:

[0076] The bottom shell 71 is located at the bottom of the main platform 21;

[0077] Guide rails 72 are installed at the front and rear ends of the left and right sides inside the bottom shell 71;

[0078] The first slide rail 73 is slidably mounted on the guide rail 72;

[0079] Sliding member 74 is slidably disposed on both sides of the first slide rail 73;

[0080] The second slide rail 75 is connected to the two sliding parts 74 on the same side, and the second slide rail 75 is connected to the bottom of the sub-platform 22 on the same side.

[0081] In this technical solution, the combination of the base shell 71, guide rail 72, slide rail, and sliding component 74 provides a stable guiding and supporting structure for the extension and retraction of the sub-platform 22, preventing swaying and displacement of the sub-platform 22 during extension and retraction, ensuring structural stability when adjusting the specifications of the carrying platform 2, and guaranteeing the safety of TJS main unit installation and operation. The orderly cooperation of each component allows the sub-platform 22 to extend and retract precisely along the predetermined track. The area of ​​the carrying platform 2 can be flexibly and accurately adjusted according to the actual needs of the main unit size and tunnel operating space, improving the adaptability of the lifting platform to complex operating scenarios. This structure, through the rational layout of each component, distributes the force on the sub-platform 22 during extension and retraction, reduces component wear, extends the service life of the extension structure 7, reduces maintenance costs, and ensures the reliability of the lifting platform during long-term operation in large-diameter shield tunnels.

[0082] Working principle: The base shell 71 is fixedly installed at the bottom of the main platform 21, serving as the basic frame of the telescopic structure 7 and providing a mounting carrier for other components. Guide rails 72 are symmetrically installed on the left and right sides inside the base shell 71, forming stable guide tracks. The first slide rail 73 is slidably mounted on the guide rail 72 and can slide back and forth along the guide rail 72. Sliding parts 74 are respectively installed on both sides of the first slide rail 73 and can slide left and right relative to the first slide rail 73. The second slide rail 75 is connected and fixed to the two sliding parts 74 on the same side, and the second slide rail 75 is connected to the bottom of the sub-platform 22. In the static state, the sub-platform 22 is in its initial position, and all sliding parts remain relatively stationary. When it is necessary to increase the area of ​​the supporting platform 2 so that the sub-platform 22 can extend outward, the worker pulls the sub-platform 22. The sub-platform 22 drives the second slide rail 75 to slide outward on the first slide rail 73 through the slider 74. When the slider 74 slides to the limit of the first slide rail 73, the second slide rail 75 drives the first slide rail 73 to slide on the guide rail 72. Due to the guiding effect of the guide rail 72, the first slide rail 73 and the second slide rail 75, the sub-platform 22 can only move smoothly along the direction set by the guide rail 72. The second slide rail 75 drives the sub-platform 22 to extend outward synchronously. Throughout the process, the guide rail 72 guides and constrains the first slide rail 73, the first slide rail 73 guides the slider 74, and the slider 74 guides the second slide rail 75, ensuring that the sub-platform 22 extends smoothly and accurately along a fixed direction. When it is necessary to reduce the area of ​​the supporting platform 2 and retract the sub-platform 22, the worker pushes the second slide rail 75 inward through the sliding member 74 on the first slide rail 73. The sliding fit between the components ensures that the sub-platform 22 can smoothly retract to its initial position. Throughout the extension and retraction of the sub-platform 22, the sliding contact between the sliding member 74 and the slide rail, as well as the sliding contact between the slide rail and the guide rail 72, are reduced by reasonable structural design and surface treatment (such as adding a lubricating layer and using wear-resistant materials) to reduce frictional resistance, ensure smooth extension and retraction, reduce component wear, and maintain the long-term stable operation of the extension structure 7. In this way, the area of ​​the supporting platform 2 can be flexibly and accurately adjusted according to the actual needs of the main unit size and the tunnel working space, improving the adaptability of the lifting platform to complex working scenarios.

[0083] like Figure 5 and Figure 6 As shown, in this embodiment, the optimized main platform 21 is provided with a guide component 8 at its bottom. The guide component 8 includes:

[0084] Guide grooves 81 are formed inside the bottom shell 71 on the left and right sides and the front and rear sides;

[0085] The guide plate 82 is slidably disposed in the guide groove 81, and the guide plate 82 is fixedly connected to the sub-platform 22.

[0086] In this technical solution, the cooperation between the guide groove 81 and the guide plate 82 provides multi-dimensional guiding constraints for the telescopic movement of the sub-platform 22, assisting components such as the guide rail 72 and slide rail in the telescopic structure 7 to ensure that the sub-platform 22 will not experience lateral displacement, tilting, or jamming during telescopic movement. This allows the sub-platform 22 to move smoothly along a predetermined path, improving the reliability of the load-bearing platform 2's specification adjustment. It also disperses the lateral forces and torques generated during the telescopic movement of the sub-platform 22 and when carrying the main unit, evenly transmitting the force on the sub-platform 22 to the main platform 21. This enhances the stability of the connection between the main platform 21 and the sub-platform 22, preventing structural deformation or damage caused by uneven force distribution, and providing a more stable working platform for the TJS main unit.

[0087] like Figure 1 As shown, in this embodiment, the optimized sub-platform 22 is provided with a fixed seat 9 on the upper part, and there are receiving slots 10 on both sides of the fixed seat 9. A guardrail 11 is fixed between the two receiving slots 10.

[0088] In this technical solution, by setting up a guardrail 11 on the upper part of the sub-platform 22, a protective barrier is provided for personnel who are performing equipment installation, debugging and maintenance work on the bearing platform 2, to prevent personnel from falling accidentally, reduce safety risks during the operation process and ensure the personal safety of construction personnel.

[0089] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A lifting platform adapted to the main machine of large-diameter shield tunnel reinforcement construction method, characterized in that, include: A base (1) is provided with a support platform (2); The lifting support assembly (3) includes multiple sets of hydraulic cylinders (31) and matching guide rods (32). The guide rods (32) and hydraulic cylinders (31) are arranged in parallel and installed on the base (1). A linear bearing (33) is slidably provided on the guide rod (32). A connecting plate (34) is provided on the linear bearing (33), and the connecting plate (34) is connected to the bearing platform (2). The hydraulic cylinders (31) are connected to the bottom of the connecting plate (34). The self-locking mechanism (4) cooperates with the linear bearing (33) on the guide rod (32) to lock the linear bearing (33). The self-locking mechanism (4) includes a locking element adapted to the linear bearing (33).

2. The lifting platform for the main machine of the large-diameter shield tunnel reinforcement method according to claim 1, characterized in that, The locking element includes: An external thread (41) is provided on the outer surface of the linear bearing (33); A locking sleeve (42) has a through groove (43) inside, and the locking sleeve (42) is fitted onto the linear bearing (33) through the through groove (43); An internal thread (44) is provided in the inner diameter of the through groove (43) of the locking sleeve (42), and the internal thread (44) is threadedly engaged with the external thread (41); A threaded section (45) is provided at the lower part of the locking sleeve (42), and the threaded section (45) is provided with an installation groove (46) that communicates with the through groove (43). Nut cap (47) is movably mounted on threaded section (45), and the nut cap (47) is threadedly engaged with threaded section (45); A connecting groove (48) is provided at the bottom of the nut cover (47) and is connected to the mounting groove (46) and the through groove (43).

3. The lifting platform for the main machine of the large-diameter shield tunnel reinforcement method according to claim 2, characterized in that, The mounting groove (46) is provided with a sealing structure (5), which includes a clamping member (51) and a lip seal (52). The clamping member (51) is located in the mounting groove (46), and the lip seal (52) hugs the clamping member (51). The outer surface of the clamping member (51) is provided with a groove (53), and the lip seal (52) is set in the groove (53) and seals the mounting groove (46) of the threaded section (45). The lower part of the lip seal (52) and the clamping member (51) extends out of the mounting groove (46) and is located in the nut cover (47). After the nut cover (47) is tightened, it clamps the lip seal (52) and the clamping member (51).

4. The lifting platform for the main machine of the large-diameter shield tunnel reinforcement method according to claim 1, characterized in that, The hydraulic cylinder (31) is a synchronous hydraulic cylinder (31), and multiple sets of hydraulic cylinders (31) achieve synchronous lifting and lowering through the hydraulic control system (6).

5. The lifting platform for the main machine of the large-diameter shield tunnel reinforcement method according to claim 1, characterized in that, The carrying platform (2) is a split structure, consisting of a main platform (21) and multiple sub-platforms (22). The sub-platforms (22) are equipped with telescopic structures (7), and the sub-platforms (22) are telescopically mounted on both sides of the main platform (21) through the telescopic structures (7).

6. The lifting platform for the main machine of the large-diameter shield tunnel reinforcement method according to claim 5, characterized in that, The telescopic structure (7) includes: The bottom shell (71) is located at the bottom of the main platform (21); The guide rail (72) is installed at the front and rear ends of the left and right sides inside the bottom shell (71); The first slide rail (73) is slidably mounted on the guide rail (72); The slider (74) is slidably disposed on both sides of the first slide rail (73); The second slide rail (75) is connected to the two slide members (74) on the same side, and the second slide rail (75) is connected to the bottom of the sub-platform (22) on the same side.

7. The lifting platform for the main machine of the large-diameter shield tunnel reinforcement method according to claim 6, characterized in that, The main platform (21) is provided with a guide component (8) at its bottom, the guide component (8) including: Guide grooves (81) are provided on the left and right sides and the front and rear sides inside the bottom shell (71); The guide plate (82) is slidably disposed in the guide groove (81), and the guide plate (82) is fixedly connected to the sub-platform (22).

8. The lifting platform for the main machine of the large-diameter shield tunnel reinforcement method according to claim 5, characterized in that, The sub-platform (22) is provided with a fixed seat (9) on the upper part, and the fixed seat (9) is provided with receiving slots (10) on both sides, and a guardrail (11) is fixed between the two receiving slots (10).

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