A follow-up support control device for bridge jacking

Abstract

The present invention relates to the technical field of building jacking devices, and in particular to a follow-up support control device for bridge jacking, including a first lock nut, a driving mechanism and a follow-up support control valve; the first lock nut is threadedly connected to the piston rod of the hydraulic cylinder; the driving mechanism is drivably connected to the first lock nut; the follow-up support control valve can be flexibly supported and arranged below the first lock nut. The present invention realizes safe and reliable alternating jacking construction, greatly improves its jacking efficiency, and solves the problems of large space occupation and high construction difficulty of the follow-up support device in the prior art; and the lock nut of the hydraulic cylinder is driven by the driving mechanism, which reduces the work intensity of the construction personnel; in addition, during the normal jacking process of the hydraulic cylinder of the present invention, the lock nut does not need to bear the heavy pressure of the bridge, thereby completely eliminating the displacement error, improving the accuracy of the jacking construction, avoiding construction accidents caused by displacement errors, and further providing a reliable guarantee for the construction safety of the bridge jacking project.

Description

Technical Field

[0001] The invention relates to the technical field of building jacking devices, and in particular to a follow-up support control device for bridge jacking. Background Art

[0002] At present, bridge jacking technology has been widely used, and the commonly used construction method is hydraulic cylinder jacking, especially in large-tonnage bridge jacking projects, hydraulic jacking is the only choice. PLC hydraulic synchronous control jacking is usually used. During the jacking process, it is also necessary to use a synchronous auxiliary support structure, that is, the support system of the mechanical threaded structure automatically follows, so that when the cylinder loses pressure (the internal seal of the cylinder is damaged or the oil pipe is broken, etc.) during the jacking process, the weight of the bridge can immediately fall on the follow-up support system to prevent the bridge from falling, thereby ensuring the safety of the jacking construction.

[0003] However, the hydraulic cylinder and the follower support device still have the following shortcomings during actual use: on the one hand, the hydraulic cylinder and the follower support device are two independent systems, which occupy a large space. Especially when used in occasions where construction space is limited, the construction is difficult and it is difficult to accurately install the support pads in place; on the other hand, the hydraulic cylinder is equipped with a lock nut, and the lock nut requires manual adjustment by the construction personnel, and the operation process is extremely time-consuming and labor-intensive. Summary of the invention

[0004] In response to the above technical problems, the present invention provides a follow-up support control device for bridge jacking to solve the problems in the prior art that the hydraulic cylinder and the follow-up support device occupy a large space and the construction personnel need to manually adjust the lock nut to operate. This avoids the situation where the construction is difficult due to limited construction space and the construction personnel need to spend time and effort to manually adjust the lock nut.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] The present invention provides a follow-up support control device for bridge jacking, comprising a first lock nut, a driving mechanism and a follow-up support control valve; the first lock nut is threadedly connected to the piston rod of the hydraulic cylinder, and a gap is left between the first lock nut and the upper cylinder body of the hydraulic cylinder; the driving mechanism is detachably arranged on the outer periphery of the upper cylinder body, and the driving mechanism is drivably connected to the first lock nut; the follow-up support control valve is movably arranged on the outer periphery of the upper cylinder body, and the follow-up support control valve can be movably supported and arranged below the first lock nut.

[0007] The present invention provides a follow-up support control device for bridge jacking. Preferably, the driving mechanism includes a motor support block, a driving motor and a gear; the motor support block is detachably arranged on the outer periphery of the upper cylinder body; the driving motor is detachably arranged on the outer periphery of the upper cylinder body through the motor support block; the gear is rotatably connected to the rotating shaft of the driving motor; and the gear is transmission-connected to the first lock nut.

[0008] The present invention provides a follow-up support control device for bridge jacking. Preferably, the follow-up support control valve includes a valve body, a push rod, a first spring mechanism and a first plug; the valve body is detachably arranged on the outer periphery of the upper cylinder body; the push rod is movably inserted into the push rod cavity of the valve body; the first plug is arranged at the bottom of the valve body, and the first plug is tightly connected to the push rod cavity; the first spring mechanism is detachably arranged between the push rod and the first plug.

[0009] The present invention provides a follow-up support control device for bridge jacking. Preferably, the follow-up support control valve also includes an adjusting rod and a second lock nut; one end of the adjusting rod is adjustably set on the push rod through the second lock nut, and the other end of the adjusting rod is supportably set below the first lock nut.

[0010] The present invention provides a follow-up support control device for bridge jacking. Preferably, the adjusting rod can support one end of the first lock nut and is detachably provided with a friction reduction mechanism.

[0011] The present invention provides a follow-up support control device for bridge jacking. Preferably, the valve body is provided with a first oil filling port for connecting to the oil port of the hydraulic station and a second oil filling port for connecting to the oil port of the motor; a gap is left between the push rod and the push rod cavity; the push rod cavity presents a cavity structure with a smaller cross-section from bottom to top; the first oil filling port and the second oil filling port are both connected to the push rod cavity.

[0012] The present invention provides a follow-up support control device for bridge jacking. Preferably, the push rod is a variable diameter rod-shaped structure; the push rod and the push rod cavity can form a first gap and a second gap; the first gap can be connected to the first oil filling port; the second gap can be connected to the second oil filling port.

[0013] The present invention provides a follow-up support control device for bridge jacking. Preferably, a cylindrical cavity is also provided on the valve body; the cavity is connected to the first oil filling port and the second oil filling port; one end of the cavity passes through the surface of the valve body and is tightly connected to a second plug, and the other end of the cavity is detachably provided with a steel ball; a second spring mechanism is detachably provided in the cavity, and the second spring mechanism is arranged between the second plug and the steel ball.

[0014] The present invention provides a follow-up support control device for bridge jacking. Preferably, the lower cylinder body of the hydraulic oil cylinder is detachably arranged on the bottom of the upper cylinder body through an end cover.

[0015] The present invention provides a follow-up support control device for bridge jacking. Preferably, sealing elements are provided between the piston rod and the end cover, between the end cover and the lower cylinder body, between the push rod and the valve body, and between the first plug and the valve body.

[0016] The above technical solution has the following advantages or beneficial effects:

[0017] The present invention provides a follow-up support control device for bridge jacking, comprising a first lock nut, a driving mechanism and a follow-up support control valve; the first lock nut is threadedly connected to the piston rod of the hydraulic cylinder, and a gap is left between the first lock nut and the upper cylinder body of the hydraulic cylinder; the driving mechanism is detachably arranged on the outer periphery of the upper cylinder body, and the driving mechanism is drivably connected to the first lock nut; the follow-up support control valve is movably arranged on the outer periphery of the upper cylinder body, and the follow-up support control valve can be movably supported and arranged below the first lock nut. The utility model discloses a hydraulic oil cylinder, and it is a kind of hydraulic oil cylinder of the present invention, and it is the hydraulic oil cylinder of the present invention that is used for installing another group of hydraulic oil cylinders. The hydraulic oil cylinder of the present invention can realize the safe and reliable alternating jacking construction. Compared with the prior art that the jacking of the oil cylinder and the falling back of the dynamic support device cannot be carried out at the same time, the jacking efficiency of the present invention is greatly improved, and the problem that the dynamic support device occupies a large space and is difficult to construct in the prior art is solved. On the other hand, the lock nut of the hydraulic oil cylinder is driven by the driving mechanism, and there is no need for manual adjustment and operation by the construction personnel, thereby improving the construction efficiency of the jacking project and reducing the work intensity of the construction personnel to a great extent. In addition, after one jacking stroke of the hydraulic oil cylinder of the present invention is completed, the other group of hydraulic oil cylinders is immediately jacked up, and the cylinders are not retracted until the original group of oil cylinders are no longer under stress. During the normal jacking process, the first lock nut does not need to bear the heavy pressure of the bridge, thereby completely eliminating the displacement error, improving the accuracy of the jacking construction, avoiding construction accidents caused by displacement error, and further providing a reliable guarantee for the construction safety of the bridge jacking project. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention and its features, configurations and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts throughout the drawings. The drawings are not drawn to scale, but rather to illustrate the subject matter of the present invention.

[0019] Figure 1 is a schematic structural diagram of a follow-up support control device for bridge jacking provided in Example 1 of the present invention;

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure of the follow-up support control valve. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the present invention.

[0022] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Embodiment 1:

[0025] The hydraulic cylinder and follow-up support device in the prior art still have the following shortcomings during actual use: on the one hand, the hydraulic cylinder and the follow-up support device are two independent systems, which occupy a large space. Especially when used in occasions with limited construction space, the construction is difficult and it is difficult to accurately install the support pad in place; on the other hand, the hydraulic cylinder is equipped with a lock nut, and the lock nut needs to be manually adjusted by the construction personnel, and the operation process is extremely time-consuming and labor-intensive.

[0026] In order to solve the problems in the prior art that the hydraulic cylinder and the follower support device occupy a large space and the construction personnel need to manually adjust the lock nut, and avoid the situation that the construction is difficult due to limited construction space and the construction personnel manually adjust the lock nut. Time-consuming and laborious, a follower support control device for bridge jacking is provided in Example 1 of the present invention, such as Figure 1As shown, it includes a first lock nut 1, a driving mechanism 2 and a follower support control valve 3; the first lock nut 1 is threadedly connected to the piston rod 41 of the hydraulic cylinder 4, and a gap is left between the first lock nut 1 and the upper cylinder body 42 of the hydraulic cylinder 4; the driving mechanism 2 is detachably arranged on the outer periphery of the upper cylinder body 42, and the driving mechanism 2 and the first lock nut 1 are drivably connected; the follower support control valve 3 is movably arranged on the outer periphery of the upper cylinder body 42, and the follower support control valve 3 can be movably supported and arranged below the first lock nut 1. The present invention eliminates the independent follow-up support device in the prior art, improves the lock nut of the hydraulic cylinder 4, and arranges a driving mechanism 2 for driving the first lock nut 1 and a follow-up support control valve 3. The valve core of the follow-up support control valve 3 can move up and down with the first lock nut 1. When the hydraulic cylinder 4 is lifted, the first lock nut 1 is always driven by the driving mechanism 2 to be in close contact with the upper end surface of the cylinder body, and immediately plays a supporting role when the cylinder loses pressure. When the cylinder is closed, due to the throttling effect of the follow-up support control valve 3, the first lock nut 1 always maintains a gap of 0.5mm-1mm with the upper end surface of the cylinder body, thereby ensuring smooth cylinder closing. On the one hand, the present invention uses the space for installing the cancelled follow-up support device to install another group of hydraulic cylinders 4. During the jacking construction, the two groups of hydraulic cylinders 4 operate independently, one group falls back while the other group continues to jack up, thereby realizing safe and reliable alternating jacking construction. Compared with the prior art in which the hydraulic cylinder jacking and the follow-up support device cannot be carried out at the same time, the jacking efficiency of the present invention is greatly improved, and the problem that the follow-up support device in the prior art occupies a large space and is difficult to construct is solved; on the other hand, the first lock nut 1 on the hydraulic cylinder 4 is driven by the driving mechanism 2, and there is no need for manual adjustment and operation by the construction personnel, thereby improving the construction efficiency of the bridge jacking project while also reducing it to a large extent. The working intensity of construction workers; in addition, after a jacking stroke is completed, the hydraulic cylinder 4 in the prior art is first retracted. At this time, the weight of the bridge is evenly pressed on the mechanical threads of the follow-up support device, which is easy to produce compression deformation, resulting in unavoidable displacement error. After a jacking stroke of the hydraulic cylinder 4 of the present invention is completed, another group of hydraulic cylinders 4 is immediately lifted, and the cylinder retraction is started when the original group of hydraulic cylinders 4 is no longer under force. During the normal jacking process, the first lock nut 1 does not need to bear the heavy pressure of the bridge, thereby completely eliminating the displacement error, improving the accuracy of the jacking construction, avoiding construction accidents caused by displacement errors, and further providing a reliable guarantee for the construction safety of the bridge jacking project.

[0027] In order to ensure the working reliability of the first lock nut 1 and the driving mechanism 2 and simplify their structures, the follow-up support control device for bridge jacking provided in this embodiment further comprises: Figure 1As shown, the driving mechanism 2 includes a motor support block 21, a driving motor 22 and a gear 23; the motor support block 21 is detachably arranged on the outer periphery of the upper cylinder body 42; the driving motor 22 is detachably arranged on the outer periphery of the upper cylinder body 42 through the motor support block 21; the gear 23 is rotatably connected to the rotating shaft of the driving motor 22; and the gear 23 is transmission-connected to the first lock nut 1. By arranging the motor support block 21, the driving motor 22 and the gear 23, the driving motor 22 can be reliably arranged on the hydraulic cylinder 4 through the motor support block 21. When the hydraulic cylinder 4 is lifted, the driving motor 22 works and drives the gear 23 meshing with the first lock nut 1 to rotate, thereby driving the first lock nut 1 to rotate, wherein the module of the gear 23 is consistent with the module of the teeth on the outer surface of the first lock nut 1. Since the power required to directly drive the first lock nut 1 through the driving motor 22 is relatively high, therefore, by arranging a gear 23, the power requirement for the driving motor 22 can be reduced, and its structure is relatively simple, easy to implement, and economical.

[0028] In order to further improve the working reliability of the follow-up support control device, the follow-up support control device for bridge jacking provided in this embodiment further comprises: Figure 1-2As shown, the follow-up support control valve 3 includes a valve body 31, a push rod 32, a first spring mechanism 33 and a first plug 34; the valve body 31 is detachably arranged on the outer periphery of the upper cylinder body 42; the push rod 32 is movably arranged in the push rod cavity 311 of the valve body 31; the first plug 34 is arranged at the bottom of the valve body 31, and the first plug 34 is tightly connected with the cavity of the push rod 32; the first spring mechanism 33 is detachably arranged between the push rod 32 and the first plug 34. The valve body 31 is provided with a first oil filling port 312 for connecting to the oil port of the hydraulic station and a second oil filling port 313 for connecting to the oil port of the drive motor 22; a gap is left between the push rod 32 and the push rod cavity 311; the push rod cavity 311 is a cavity structure with a smaller cross section from bottom to top; the first oil filling port 312 and the second oil filling port 313 are both connected to the push rod cavity 311. The push rod 32 is a rod-shaped structure with a variable diameter; the push rod 32 and the push rod cavity 311 can form a first gap 314 and a second gap 315; the first gap 314 can be connected to the first oil filling port 312; the second gap 315 can be connected to the second oil filling port 313. By arranging the valve body 31, the push rod 32, the first spring mechanism 33 and the first plug 34 and other components, the oil port of the hydraulic cylinder 4 is connected to the A and B ports of the jacking pump station respectively; the oil port of the drive motor 22 is connected to the follower pump station on one way and the valve body 31 on the other way, and the valve body 31 is connected to the follower pump station. When the hydraulic cylinder 4 is in the lifting operation, the oil outlet of the follower pump station is connected to the drive motor 22 through the valve body 31, thereby driving the drive motor 22 to rotate toward the upper cylinder body 42, and the push rod 32 and the first spring mechanism 33 on the valve body 31 and other components play the role of a one-way valve to ensure that the oil circuit of the first lock nut 1 is unobstructed at any position; when the hydraulic cylinder 4 is in the cylinder retracting operation, the return oil of the drive motor 22 flows back to the follower pump station through the valve body 31, at this time the one-way valve is closed, and the hydraulic oil flows through the first gap 314 between the valve body 31 and the push rod 32, driving the first The lock nut 1 rotates in the opposite direction toward the upper cylinder body 42, so that the push rod 32 rises under the action of the spring, and the oil passage cross-section decreases until it disappears. In the process of the cylinder closing, the first lock nut 1 is driven to approach the upper cylinder body 42, and the push rod 32 is pressed down, the second gap 315 is opened, and the oil return path of the drive motor 22 begins to be unblocked, and then the first lock nut 1 is driven to rotate, which can ensure that the distance between the first lock nut 1 and the upper cylinder body 42 is maintained within a certain range, thereby ensuring the working reliability of the follow-up support control device and further improving the construction safety of the bridge jacking project.

[0029] In order to further facilitate the regulation and control of the oil, the follow-up support control device for bridge jacking provided in this embodiment further comprises: Figure 1-2As shown, a cylindrical cavity 316 is also provided on the valve body 31; the cavity 316 is connected to the first oil filling port 312 and the second oil filling port 313; one end of the cavity 316 passes through the surface of the valve body 31 and is tightly connected to the second plug 35, the second plug 35 is a cone plug, and the other end of the cavity 316 is detachably provided with a steel ball 36; a second spring mechanism 37 is detachably provided in the cavity 316, and the second spring mechanism 37 is arranged between the second plug 35 and the steel ball 36.

[0030] In order to facilitate the adjustment of the relative length of the push rod 32 to meet the use requirements, the follow-up support control device for bridge jacking provided in this embodiment further includes: Figure 1-2 As shown, the follow-up support control valve 3 also includes an adjusting rod 38 and a second lock nut 39; one end of the adjusting rod 38 is adjustably arranged on the push rod 32 through the second lock nut 39, and the other end of the adjusting rod 38 is supportably arranged below the first lock nut 1. By setting the adjusting rod 38 and the second lock nut 39, the push rod 32 can be inserted into the adjusting rod 38. In order to meet the travel range requirement of the push rod 32 and the first lock nut 1, when the length of the push rod 32 needs to be adaptively adjusted, at this time, the relative length of the push rod 32 in the adjusting rod 38 can be adjusted, and then locked by the second lock nut 39, so that the relative length of the push rod 32 can be conveniently and quickly adaptively adjusted. The structure is simple, easy to implement, and easy to operate.

[0031] In order to extend the service life of the follow-up support control valve 3, the follow-up support control device for bridge jacking provided in this embodiment further includes: Figure 1-2 As shown, the end of the adjusting rod 38 that supports the first lock nut 1 is detachably provided with a friction reducing mechanism 381. Since the adjusting rod 38 will contact with the first lock nut 1 and generate greater friction during the jacking construction process, the friction reducing mechanism 381 can effectively reduce the wear between the adjusting rod 38 and the first lock nut 1, and during the maintenance of the device, it is only necessary to regularly replace the friction reducing mechanism 381 without replacing other parts, thereby extending the service life of the follow-up support control valve 3.

[0032] In order to further improve the construction safety and reliability of the bridge jacking project, the follow-up support control device for bridge jacking provided in this embodiment further includes: Figure 1-2As shown, the lower cylinder body 43 of the hydraulic oil cylinder 4 is detachably arranged at the bottom of the upper cylinder body 42 through the end cover 44. A sealing element 45 is arranged between the piston rod 41 and the end cover 44, between the end cover 44 and the lower cylinder body 43, between the push rod 32 and the valve body 31, and between the first plug 34 and the valve body 31. By setting the sealing element 45, the sealing performance of the hydraulic oil cylinder 4 during the jacking and cylinder closing operations and the operation of the follow-up support control valve 3 is guaranteed, and construction accidents such as hydraulic leakage or sealing leakage are avoided, thereby improving the working reliability of the entire hydraulic control system, and further providing a reliable guarantee for the construction safety of the bridge jacking project.

[0033] In summary, the follow-up support control device for bridge jacking provided by the present invention, on the one hand, uses the setting space of the cancelled follow-up support device to install another group of hydraulic cylinders, thereby realizing safe and reliable alternating jacking construction, and compared with the prior art in which the cylinder jacking and the follow-up support device cannot be lowered at the same time, the jacking efficiency of the present invention is greatly improved, and the problems of large space occupation and large construction difficulty of the follow-up support device in the prior art are solved; on the other hand, the lock nut of the hydraulic cylinder is driven by the driving mechanism, and no manual adjustment operation by the construction personnel is required, thereby improving the construction efficiency of the jacking project while reducing the work intensity of the construction personnel to a large extent; in addition, after a jacking stroke of the hydraulic cylinder of the present invention is completed, another group of hydraulic cylinders is immediately jacked, and the cylinders are not retracted until the original group of cylinders are no longer under force. During the normal jacking process, the first lock nut does not need to bear the heavy pressure of the bridge, thereby completely eliminating the displacement error, improving the accuracy of the jacking construction, avoiding construction accidents caused by displacement errors, and further providing a reliable guarantee for the construction safety of the bridge jacking project.

[0034] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A follow-up support control device for bridge jacking, characterized in that: It includes a first lock nut, a driving mechanism and a follow-up support control valve; The first lock nut is threadedly connected to the piston rod of the hydraulic cylinder, and a gap is left between the first lock nut and the upper cylinder body of the hydraulic cylinder; The driving mechanism is detachably arranged on the outer periphery of the upper cylinder body, and the driving mechanism is drivably connected to the first lock nut; The follow-up support control valve can be movably arranged on the outer periphery of the upper cylinder body, and the follow-up support control valve can be movably supported and arranged below the first lock nut; The follow-up support control valve includes a valve body, a push rod, a first spring mechanism and a first plug; the valve body is detachably arranged on the periphery of the upper cylinder body; the push rod is movably arranged in the push rod cavity of the valve body; the first plug is arranged at the bottom of the valve body, and the first plug is tightly connected to the push rod cavity; the first spring mechanism is detachably arranged between the push rod and the first plug; the follow-up support control valve also includes an adjusting rod and a second lock nut; one end of the adjusting rod is adjustably arranged on the push rod through the second lock nut, and the other end of the adjusting rod is supportably arranged below the first lock nut; The valve body is provided with a first oil filling port for connecting to the oil port of the hydraulic station and a second oil filling port for connecting to the oil port of the motor; a gap is left between the push rod and the push rod cavity; the push rod cavity has a cavity structure with a smaller cross section from bottom to top; the first oil filling port and the second oil filling port are both connected to the push rod cavity; A cylindrical cavity is also provided on the valve body; the cavity is connected to the first oil filling port and the second oil filling port; one end of the cavity passes through the surface of the valve body and is tightly connected to a second plug, and the other end of the cavity is detachably provided with a steel ball; a second spring mechanism is detachably provided in the cavity, and the second spring mechanism is arranged between the second plug and the steel ball.

2. A follow-up support control device for bridge jacking according to claim 1, characterized in that: The driving mechanism includes a motor support block, a driving motor and a gear; the motor support block is detachably arranged on the outer periphery of the upper cylinder body; the driving motor is detachably arranged on the outer periphery of the upper cylinder body through the motor support block; the gear is rotatably connected to the rotating shaft of the driving motor; the gear is transmission-connected to the first lock nut.

3. The follow-up support control device for bridge jacking according to claim 1 is characterized in that: The end of the adjusting rod that supports the first lock nut is detachably provided with a friction reducing mechanism.

4. The follow-up support control device for bridge jacking according to claim 1, characterized in that: The push rod is a rod-shaped structure with a variable diameter; the push rod and the push rod cavity can form a first gap and a second gap; the first gap can be connected to the first oil filling port; the second gap can be connected to the second oil filling port.

5. A follow-up support control device for bridge jacking according to any one of claims 1, 3 and 4, characterized in that: The lower cylinder body of the hydraulic oil cylinder is detachably arranged on the bottom of the upper cylinder body through an end cover.

6. A follow-up support control device for bridge jacking according to claim 5, characterized in that: Sealing elements are provided between the piston rod and the end cover, between the end cover and the lower cylinder body, between the push rod and the valve body, and between the first plug and the valve body.

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