Support maintenance replacement jacking device

Abstract

The application relates to a support maintenance and replacement jacking device, which comprises a supporting mechanism, a base located below the supporting mechanism, a first lifting mechanism connected with the supporting mechanism and the base, the first lifting mechanism being configured to drive the supporting mechanism to lift, and an auxiliary mechanism comprising a plurality of first telescopic members, the top ends of the plurality of first telescopic members being rotationally connected with the supporting mechanism. When the supporting mechanism is driven by the first lifting mechanism to lift to contact the bridge, the angle and length of at least part of the first telescopic members can be flexibly adjusted according to the pressure direction of the bridge, and the auxiliary mechanism is used for auxiliary support. At this time, the support direction of the first telescopic members used for auxiliary support is parallel or approximately parallel to the pressure direction of the bridge, the support maintenance and replacement jacking device is prevented from being damaged due to uneven force, the service life of the support maintenance and replacement jacking device is effectively prolonged, and the construction safety is improved.

Description

Technical Field

[0001] This application relates to the field of bridge technology, and in particular to a bearing repair and replacement jacking device. Background Technology

[0002] Bridge bearings are important connecting structures between bridges and piers. According to the actual application requirements of bridge engineering, bearings usually need to have good seismic resistance and installation strength, and at the same time be able to adapt to deformation forces from multiple directions of bridge engineering.

[0003] In conventional techniques, the bridge is lifted using a jacking structure (such as a hydraulic jack) located between the bridge's base and the piers, thus detaching the supports from the bridge. During this process, the lifting direction of the jacking structure may form an angle with the pressure exerted by the bridge on the jacking structure, which can easily damage the jacking structure, significantly reducing its service life and compromising construction safety. Utility Model Content

[0004] Therefore, it is necessary to provide a support maintenance and replacement lifting device to address the problem that the lifting direction of the jacking structure may be at an angle to the pressure direction of the bridge on the jacking structure during the removal of the support, which may easily lead to damage to the jacking structure.

[0005] This application provides a support maintenance and replacement lifting device, comprising: a support mechanism; a base located below the support mechanism; a first lifting mechanism connecting the support mechanism and the base, the first lifting mechanism being configured to drive the support mechanism to lift; and an auxiliary mechanism including a plurality of first telescopic members, the top ends of the plurality of first telescopic members being rotatably connected to the support mechanism.

[0006] According to one embodiment of this application, the support mechanism includes: a first frame; a second frame located below the first frame and connected to the first lifting mechanism and the auxiliary mechanism respectively; and a second lifting mechanism connected to the first frame and the second frame, the second lifting mechanism being configured to drive the first frame to lift relative to the second frame.

[0007] According to one embodiment of this application, the second lifting mechanism includes: a plurality of second telescopic members, the first frame and the second frame are both rectangular frames, and the edge of each first frame is connected to the edge of the corresponding second frame through at least one second telescopic member.

[0008] According to one embodiment of this application, the second telescopic member is hinged to both the first frame and the second frame.

[0009] According to one embodiment of this application, the auxiliary mechanism further includes: a plurality of limiting members, wherein the plurality of limiting members are fixedly connected to the plurality of second telescopic members in a one-to-one correspondence, and the limiting members are located on the side of the bottom end of the corresponding second telescopic member close to the center of the second frame; wherein, when the axis of the second telescopic member is parallel to that of the first telescopic member on the same side, the limiting member contacts and engages with the side of the first telescopic member close to the center of the second frame.

[0010] According to one embodiment of this application, the first lifting mechanism includes a plurality of third telescopic members, all of which are vertically disposed between the support mechanism and the base, and are respectively fixedly connected to the support mechanism and the base.

[0011] According to one embodiment of this application, the base includes a third frame, which is a rectangular frame. The middle parts of the four sides of the first frame and the middle parts of the four sides of the second frame are connected by a second telescopic member, and the four corners of the second frame and the four corners of the third frame are connected by the third telescopic member.

[0012] According to one embodiment of this application, the first frame, the second frame, and the third frame are all configured such that at least one side is detachably connected to two adjacent side frames.

[0013] According to one embodiment of this application, the first frame, the second frame, and the third frame are all configured such that at least one sidewall includes a detachably connected constituent segment.

[0014] According to one embodiment of this application, at least one of the first telescopic member, the second telescopic member, and the third telescopic member is a hydraulic cylinder.

[0015] When the aforementioned support maintenance and replacement jacking device is driven by the first lifting mechanism to rise to contact the bridge, the angle and length of at least part of the first expansion joint can be flexibly adjusted according to the pressure direction of the bridge. Assisted support is provided by an auxiliary mechanism. At this time, the support direction of the first expansion joint, which plays an auxiliary support role, is parallel or approximately parallel to the pressure direction of the bridge. This prevents uneven stress on the support maintenance and replacement jacking device from causing damage, effectively extending its service life and improving construction safety. Attached Figure Description

[0016] Figure 1 This application provides an overall structural schematic diagram of a support maintenance and replacement lifting device according to an embodiment of the present application.

[0017] Figure 2 This application provides an application scenario diagram of a support maintenance and replacement jacking device according to an embodiment of the present application.

[0018] Figure 3 This application provides a schematic diagram illustrating the connection relationship between the second telescopic component and the limiting component in a support maintenance and replacement lifting device according to an embodiment of the present application.

[0019] Figure 4 This application provides a schematic diagram of the structure of the third frame in a support maintenance and replacement lifting device according to an embodiment of the present application.

[0020] Figure 5 This application provides a structural schematic diagram of the third frame in a support maintenance and replacement lifting device, according to another embodiment of the present application.

[0021] Figure 6 This application provides a structural schematic diagram of the third frame in a support maintenance and replacement lifting device, according to another embodiment of the present application.

[0022] Figure label:

[0023] 100. Supporting mechanism; 101. First frame; 102. Second frame; 103. Second telescopic component;

[0024] 200. Base; 201. Third frame; 202. Component section;

[0025] 300. First lifting mechanism; 301. Third telescopic component;

[0026] 400. Auxiliary mechanism; 401. First telescopic component; 402. Limiting component;

[0027] 500. Bridges;

[0028] 600. Bridge pier. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and 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 a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] Combination Figure 1 and Figure 2 The support maintenance and replacement lifting device provided in one embodiment of this application includes a support mechanism 100, a base 200, a first lifting mechanism 300, and an auxiliary mechanism 400.

[0036] The base 200 is located below the support mechanism 100. A first lifting mechanism 300 connects the support mechanism 100 and the base 200, and is configured to drive the support mechanism 100 to rise and fall. The auxiliary mechanism 400 includes a plurality of first telescopic members 401, the top ends of which are rotatably connected to the support mechanism 100. At least some of the first telescopic members 401 are connected to different directional sides of the support mechanism 100.

[0037] In use, the bearing maintenance and replacement lifting device is placed between the bottom surface of the bridge 500 and the top surface of the pier 600. The base 200 is in surface contact with the top surface of the pier 600. The first lifting mechanism 300 is perpendicular to the top surface of the pier 600. The first lifting mechanism 300 drives the support mechanism 100 to rise, allowing the support mechanism 100 to contact the bottom surface of the bridge 500. Taking the top surface of the pier 600 as a horizontal plane as an example, the support direction of the bearing maintenance and replacement lifting device is vertical. When the pressure direction of the bridge 500 is not parallel to the vertical direction, the angle and length of part of the first expansion joint 401 can be adjusted to make the first expansion joint 401 parallel or approximately parallel to the pressure direction of the bridge 500, ensuring the stability of the support, preventing damage to the bearing maintenance and replacement lifting device, and improving construction safety.

[0038] It is understandable that the above approximate parallelism means that the angle between the pressure direction of the first telescopic member 401 and the bridge 500 is small, for example, less than 10°.

[0039] In some embodiments, the support mechanism 100 includes a first frame 101, a second frame 102, and a second lifting mechanism. The second frame 102 is located below the first frame 101 and is connected to both the first lifting mechanism 300 and the auxiliary mechanism 400. The second lifting mechanism connects the first frame 101 and the second frame 102, and is configured to drive the first frame 101 to move up and down relative to the second frame 102.

[0040] The first frame 101 is located above the support mechanism 100, directly contacting the bottom surface of the bridge 500, and is used to support the weight of the bridge 500. The second frame 102 is located below the first frame 101, connected to the base 200 via the first lifting mechanism 300, and also connected to the auxiliary mechanism 400, serving as the intermediate load-bearing structure of the support mechanism 100. The second frame 102 is connected to the base 200 via the first lifting mechanism 300, allowing it to rise and fall above the base 200. The second lifting mechanism connects the first frame 101 and the second frame 102, and by controlling the extension and retraction of the second telescopic member 103, it drives the first frame 101 to rise and fall relative to the second frame 102, achieving fine-tuning of the bottom support height of the bridge 500.

[0041] The second lifting mechanism is independent of the first lifting mechanism 300 and can independently fine-tune the height and angle of the first frame 101. During support maintenance and replacement, it can precisely control the lifting height and posture of the bridge 500, improving construction accuracy and safety, and is particularly suitable for scenarios requiring high lifting precision. Furthermore, when the support maintenance and replacement lifting device is adjusted so that the first frame 101 is in contact with the bottom surface of the bridge 500, the second lifting mechanism can drive the first frame 101 away from the second frame 102, lifting the bridge 500. This lifting method offers the advantage of convenient operation.

[0042] In some embodiments, the second lifting mechanism includes a plurality of second telescopic members 103, the first frame 101 and the second frame 102 are both rectangular frames, and the edge of each first frame 101 is connected to the edge of the corresponding second frame 102 through at least one second telescopic member 103.

[0043] For example, the two oppositely arranged sidewalls of the first frame 101 are parallel to the two oppositely arranged sidewalls of the second frame 102, and the other two sidewalls of the first frame 101 are parallel to the other two sidewalls of the second frame 102. The second lifting mechanism includes four second telescopic members 103, and each of the four sidewalls of the first frame 101 is connected to the corresponding sidewall of the second frame 102 through a second telescopic member 103.

[0044] The combination of the rectangular frame structure and multiple sets of second expansion joints 103 forms a symmetrical frame support system, which can evenly distribute the bridge load and prevent local stress concentration.

[0045] In some embodiments, the second telescopic member 103 is hinged to the first frame 101 and the second frame 102 respectively.

[0046] The second telescopic member 103 is hinged to the first frame 101 and the second frame 102 respectively, allowing the first frame 101 to adjust its angle relative to the second frame 102 within a certain range. When the bottom surface of the bridge 500 is uneven or the pressure direction is at an angle to the vertical direction, the length of the second telescopic member 103 can be adjusted to tilt the first frame 101, thereby adapting to the actual angle of the bottom surface of the bridge 500 and preventing damage to the auxiliary device due to uneven force.

[0047] Optionally, the second telescopic member 103 is hinged to the first frame 101 and the second frame 102 by a pin. For example, a rotatable connection is achieved by the pin passing through the end of the second telescopic member 103 and the connecting hole of the first frame 101 or the second frame 102.

[0048] Optionally, the second telescopic member 103 is connected to the first frame 101 and the second frame 102 by a ball joint hinge, allowing the telescopic member to rotate in multiple directions to meet the needs of greater angle adjustment.

[0049] Of course, the second telescopic member 103 can also be hinged to the first frame 101 and the second frame 102 through the clearance fit between the shaft and the hole, which limits the rotation range and is suitable for fine adjustment scenarios, thus avoiding excessive shaking.

[0050] Combination Figure 2 and Figure 3 In some embodiments, the auxiliary mechanism 400 further includes a plurality of limiting members 402, which are fixedly connected to a plurality of second telescopic members 103 in a one-to-one correspondence, and the limiting members 402 are located on the side of the bottom end of the corresponding second telescopic member 103 near the center of the second frame 102; wherein, when the axis of the second telescopic member 103 is parallel to that of the first telescopic member 401 on the same side, the limiting member 402 contacts and engages with the side of the first telescopic member 401 near the center of the second frame 102.

[0051] The connection point between the second telescopic member 103 and the second frame 102 is located inside the second frame 102, and the limiting member 402 extends to the bottom of the second frame 102, so that the limiting member 402 can rotate with the second telescopic member 103 and achieve contact and cooperation with the first telescopic member 401.

[0052] The contact engagement between the limiting member 402 and the first telescopic member 401 limits the tilt angle of the first telescopic member 401. When the second telescopic member 103 is parallel to the axis of the first telescopic member 401, the contact of the limiting member 402 allows the first telescopic member 401 and the second telescopic member 103 to form a linked support. This mechanical limiting locks the stress state of both, improving the overall structure's anti-overturning capability and load transfer efficiency. This mechanical limiting design helps determine whether the angle adjustment is in place, eliminating the need for complex sensors or electronic monitoring devices, reducing control difficulty and equipment costs, and improving operational reliability.

[0053] Optionally, the limiting member 402 is a plate-shaped structure, such as an arc-shaped plate, so that the contact area between the limiting member 402 and the first telescopic member 401 is larger, thereby increasing stability.

[0054] In some embodiments, the first lifting mechanism 300 includes a plurality of third telescopic members 301, which are all vertically arranged between the support mechanism 100 and the base 200 and are fixedly connected to the support mechanism 100 and the base 200 respectively.

[0055] The third expansion joint 301 is vertically positioned for easy on-site installation and commissioning, eliminating the need for complex angle calibration. Furthermore, its fixed, rigid structure reduces the risk of swaying, enhances impact resistance and long-term stability, and meets the jacking requirements of the heavy-duty bridge 500. When used in conjunction with the second lifting mechanism (responsible for fine-tuning), the third expansion joint 301 can achieve large-stroke vertical jacking, demonstrating clear division of labor and improving construction efficiency.

[0056] Optionally, the base 200 includes a third frame 201, which is a rectangular frame. The side borders of the second frame 102 and the third frame 201 are parallel to each other. The middle parts of the four side borders of the first frame 101 and the middle parts of the four side borders of the second frame 102 are connected by a second telescopic member 103. The four corners of the second frame 102 and the four corners of the third frame 201 are connected by a third telescopic member 301.

[0057] The second expansion joint 103 connects to the middle of the frame, and the third expansion joint 301 connects to the four corners of the frame, forming a composite structure of central hinge and four corner rigid support. This ensures that the load is evenly distributed when it is transferred from the first frame 101 (the bottom surface of the bridge 500) through the second frame 102 to the third frame 201 (the base 200), thus avoiding local stress concentration.

[0058] The rectangular frame structure of the first frame 101, the second frame 102, and the third frame 201 facilitates on-site assembly and disassembly.

[0059] The central connection of the second telescopic member 103 aligns the force center of the first frame 101 with the support center of the second frame 102. Combined with the four corner supports of the third telescopic member 301, a stable force transmission path is formed, reducing energy loss and improving lifting efficiency.

[0060] Combination Figure 4 and Figure 5 In some embodiments, the first frame 101, the second frame 102 and the third frame 201 are all configured such that at least one side is detachably connected to two adjacent side frames.

[0061] In the first frame 101, the second frame 102, and the third frame 201, at least one frame is connected to the two adjacent frames by a detachable structure (such as bolts, pins, clips, etc.), while the remaining frames can be fixedly connected (such as by welding) or detachably connected. For example, one long side and two short sides of a rectangular frame are connected by bolts, while the other three sides are fixed by welding.

[0062] Combination Figure 6 In other embodiments, the first frame 101, the second frame 102, and the third frame 201 are all configured such that at least one frame includes a detachably connected constituent segment 202. For example, a frame includes two constituent segments 202 joined together by bolts or flanges to form a detachable segmented frame, and the two constituent segments 202 are hinged to two adjacent frame segments.

[0063] In the two embodiments described above, after removing a certain frame or disconnecting the connection between the constituent segments 202, a single-sided notch is formed in the frame, which makes it easy for the device to be inserted into or removed from the support from the side, thus avoiding the problem that traditional integral frames cannot be installed due to size limitations.

[0064] To meet the disassembly requirements of the frame, when the connection position of the first telescopic member 401, the second telescopic member 103, or the third telescopic member 301 with the first frame 101, the second frame 102, or the third frame 201 is in a detachable position, the first telescopic member 401, the second telescopic member 103, or the third telescopic member 301 can be fixedly connected to one of the two detachable parts, and not connected to the other part or detachably connected. Alternatively, the first telescopic member 401, the second telescopic member 103, or the third telescopic member 301 can be detachably connected to the two detachable parts respectively.

[0065] It is worth noting that the above embodiments are all described using rectangular frames 101, 102, and 201 as examples. In some other embodiments, the first frame 101, the second frame 102, and the third frame 201 can also be pentagonal, hexagonal, or other frame structures. Furthermore, the number and position of the first telescopic member 401, the second telescopic member 103, and the third telescopic member 301 can be adjusted according to the specific configuration of the first frame 101, the second frame 102, and the third frame 201. In addition, the first frame 101, the second frame 102, and the third frame 201 can also be replaced with other structural forms such as plate supports or curved steel supports as needed, which are not listed here.

[0066] Optionally, the frames of the first frame 101, the second frame 102 and the third frame 201 may be made of square steel, angle steel, channel steel or rectangular steel pipe, etc., without specific limitations.

[0067] In some embodiments, at least one of the first telescopic member 401, the second telescopic member 103, and the third telescopic member 301 is a hydraulic cylinder.

[0068] For example, the first telescopic member 401 includes a hydraulic cylinder for inclined support, with its top end hinged to the support mechanism 100, such as the first frame 101 or the second frame 102, and its bottom end freely adjustable in angle or cooperating with other components through the limiting member 402, for auxiliary support and angle adjustment. The second telescopic member 103 includes a hydraulic cylinder inclinedly hinged between the first frame 101 and the second frame 102, which drives the first frame 101 to rise or tilt relative to the second frame 102 through telescopic movement, thereby achieving adaptive angle support for the bottom surface of the bridge 500. The third telescopic member 301 includes a hydraulic cylinder vertically fixedly connected between the second frame 102 and the third frame 201, for driving the entire support mechanism 100 to rise or fall vertically, thereby achieving the overall lifting or lowering of the bridge 500.

[0069] Hydraulic cylinders utilize fluid pressure to transmit power, providing significant lifting and supporting forces, making them suitable for replacing bearings on heavy-duty bridges 500. For example, when the third telescopic component 301 functions as a vertical hydraulic cylinder, it can evenly bear the weight of the bridge 500 through synchronized multi-cylinder operation, avoiding localized stress concentration caused by single-point force application when lifting with jacks in the traditional way.

[0070] The hydraulic system can precisely adjust the extension and retraction speed and stroke of the oil cylinder through the control valve to meet the refined operation requirements under different working conditions. For example, the second extension component 103 adjusts the tilt angle of the first frame 101 through asynchronous extension and retraction to adapt to the uneven bottom surface of the bridge 500 or the offset of the pressure direction. Alternatively, the third extension component 301 is driven by the same lifting hydraulic pump to ensure that the lifting height of the four corner oil cylinders is consistent and to avoid the tilt of the base 200.

[0071] In addition, compared to mechanical telescopic methods such as lead screws and screws, hydraulic cylinders do not require complex gear transmission mechanisms, have a simpler structure, and can monitor the load in real time through pressure sensors, thus improving safety.

[0072] 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.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A support maintenance and replacement jacking device, characterized in that, include: Supporting institutions; The base is located below the support mechanism; A first lifting mechanism is connected to the support mechanism and the base, and the first lifting mechanism is configured to drive the support mechanism to lift. The auxiliary mechanism includes multiple first telescopic members, the top ends of which are rotatably connected to the support mechanism.

2. The support maintenance and replacement lifting device according to claim 1, characterized in that, The supporting structure includes: First frame; The second frame is located below the first frame and is connected to the first lifting mechanism and the auxiliary mechanism respectively; A second lifting mechanism is connected to the first frame and the second frame, and the second lifting mechanism is configured to drive the first frame to rise and fall relative to the second frame.

3. The support maintenance and replacement lifting device according to claim 2, characterized in that, The second lifting mechanism includes: Multiple second telescopic components are provided. Both the first frame and the second frame are rectangular frames. The border of each first frame is connected to the border of the corresponding second frame through at least one second telescopic component.

4. The support maintenance and replacement lifting device according to claim 3, characterized in that, The second telescopic member is hinged to both the first frame and the second frame.

5. The support maintenance and replacement lifting device according to claim 4, characterized in that, The auxiliary mechanism also includes: Multiple limiting members are fixedly connected to multiple second telescopic members in a one-to-one correspondence, and the limiting members are located on the side of the bottom end of the corresponding second telescopic member close to the center of the second frame. Specifically, when the second telescopic member is parallel to the axis of the first telescopic member on the same side, the limiting member contacts and engages with the side of the first telescopic member closest to the center of the second frame.

6. The support maintenance and replacement lifting device according to claim 3, characterized in that, The first lifting mechanism includes a plurality of third telescopic members, all of which are vertically arranged between the support mechanism and the base, and are respectively fixedly connected to the support mechanism and the base.

7. The support maintenance and replacement lifting device according to claim 6, characterized in that, The base includes a third frame, which is a rectangular frame. The middle parts of the four sides of the first frame and the middle parts of the four sides of the second frame are connected by the second telescopic member. The four corners of the second frame and the four corners of the third frame are connected by the third telescopic member.

8. The support maintenance and replacement lifting device according to claim 7, characterized in that, The first frame, the second frame, and the third frame are all configured such that at least one side is detachably connected to two adjacent side frames.

9. The support maintenance and replacement lifting device according to claim 7, characterized in that, The first frame, the second frame, and the third frame are all configured such that at least one sidewall includes a detachably connected component segment.

10. The support maintenance and replacement lifting device according to claim 6, characterized in that, At least one of the first telescopic member, the second telescopic member, and the third telescopic member is a hydraulic cylinder.

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