Thin-wall hollow pier hydraulic self-climbing formwork device for bridge construction

Abstract

The invention belongs to the technical field of bridge construction, and discloses a thin-wall hollow pier hydraulic self-climbing formwork device for bridge construction, which comprises a climbing frame main body, a wall-attached part fixed outside the climbing frame main body, a guide rail arranged at one end of the wall-attached part, a climbing frame assembly mounted inside the wall-attached part, and a hydraulic cylinder fixed at the top end of the climbing frame assembly, a guide plate is fixed to the outer portion of the climbing frame assembly, an oil coating mechanism is installed in the guide plate, an oil storage tank is arranged on the outer portion of the guide plate, a dismounting and mounting mechanism is installed on the outer portion of the oil storage tank, and a mounting mechanism is installed at one end of the oil storage tank. The oil coating belt is driven to move, lubricating oil attached to the oil coating belt is smeared to the surface of the first oil coating barrel during moving, the first oil coating barrel can smear the lubricating oil to the attaching face of the wall attaching piece and the climbing frame assembly during climbing, and therefore the purposes that the device can smear the lubricating oil conveniently, and the service life of the device is prolonged are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, in particular to a hydraulic self-climbing formwork device for thin-walled hollow piers in bridge construction. Background Art

[0002] The key link in road bridge construction lies in thin-walled hollow piers. The appearance of thin-walled hollow piers is similar to that of gravity piers. They have the characteristics of good structural stiffness and strength, light weight, large section modulus and small cross-sectional area. They are mainly used in high bridge construction, so a climbing formwork device is required to construct the bridge.

[0003] Patent No. CN118498233A discloses a hydraulic climbing formwork device and construction method for an ultra-high variable-section thin-walled hollow pier, which belongs to the field of road and bridge construction technology. It includes a hydraulic climbing formwork device main body, and a base frame with an area larger than the hydraulic climbing formwork device main body is arranged under the hydraulic climbing formwork device main body. A locking mechanism is installed between the base frame and the bottom end of the hydraulic climbing formwork device main body, and an adsorption fixing mechanism is installed between the base frame and the concrete wall. The base frame is set, and the base frame is connected to the hydraulic climbing formwork device main body through the locking mechanism, and is connected to the concrete wall through the adsorption fixing mechanism. At the same time, a construction tool placement box is arranged on the top, which can not only place more construction tools, making it convenient for construction workers to take them, reducing the number of times construction tools are transferred, and speeding up the construction progress, but also will not increase the weight of the hydraulic climbing formwork device main body, thereby ensuring the construction safety of the hydraulic climbing formwork device main body.

[0004] However, when the hydraulic cylinder is pushing the climbing frame, it will come into contact with the wall-mounted parts, causing friction. This device requires a long period of construction, so the overall life of the climbing frame needs to be guaranteed. By applying lubricating oil at the contact point between the climbing frame and the wall-mounted parts, an oil film is formed on the friction surface to isolate the metal from direct contact, thereby reducing the friction coefficient and extending the service life of the mechanical components. This avoids the shaking of the formwork caused by strong winds during high pier construction. Summary of the Invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a hydraulic self-climbing formwork device for thin-walled hollow piers in bridge construction.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a hydraulic self-climbing formwork device for thin-walled hollow piers in bridge construction, comprising a climbing frame body, a wall attachment member fixed to the outside of the climbing frame body, a guide rail provided at one end of the wall attachment member, a climbing frame assembly installed inside the wall attachment member, a hydraulic cylinder fixed to the top of the climbing frame assembly, a guide plate fixed to the outside of the climbing frame assembly, an oiling mechanism installed inside the guide plate, an oil storage tank provided outside the guide plate, a disassembly mechanism installed outside the oil storage tank, and a mounting mechanism installed at one end of the oil storage tank; The oiling mechanism includes a first oiling cylinder, a guide rod and an oiling belt, wherein the first oiling cylinder is rotatably connected to the inside of the guide plate, the guide rod is rotatably connected to the inside of the guide plate, and the outside of the guide rod is provided with an oiling belt; The disassembly and assembly mechanism includes a connecting seat, a first limiting rod and a first limiting plate. The connecting seat is fixed to the outside of the oil storage tank. The first limiting rod is fixed to the outside of the connecting seat. The first limiting plate is fixed to the outside of the first limiting rod.

[0007] Preferably, the guide plate is internally rotatably connected to a second oiling cylinder, a first gear is fixed to the outside of the second oiling cylinder, one end of the second oiling cylinder is connected to an oil inlet hole, a servo motor is fixed to the outside of the guide plate, and a second gear is fixed to the rotating end of the servo motor.

[0008] Preferably, four groups of the first oiling cylinders are provided, and the first oiling cylinders are symmetrically distributed about the central axis of the oiling belt. Four groups of guide rods are provided, and the outer portion of the guide rods is engaged with the oiling belt, and the inner portion of the oiling belt is engaged with the second oiling cylinder, and the contact section between the second oiling cylinder and the oiling belt is provided with an oil outlet.

[0009] Preferably, two groups of the second oiling cylinder and the first gear are provided, the second oiling cylinder and the first gear are symmetrically distributed about the central axis of the servo motor, the first gear and the second gear are meshed and connected, and the outer wall of the first oiling cylinder is in contact with the inner wall of the wall attachment.

[0010] Preferably, the outer sleeve of the first limit rod is provided with a second limit plate, the outer sleeve of the guide plate is fixed with a limit seat, the inner sleeve of the limit seat is movably connected with the second limit rod, the outer sleeve of the second limit rod is provided with a first return spring, and the outer sleeve of the second limit rod is fixed with a limit block.

[0011] Preferably, there are two groups of connecting seats, which are symmetrically distributed about the central axis of the oil storage tank, the outer wall of the first limiting rod fits into the inner wall of the second limiting plate, the first limiting rod and the second limiting plate are slidably connected, and the diameter of the second limiting plate is larger than the diameter of the first limiting plate.

[0012] Preferably, the limit seat is provided with two groups symmetrically distributed about the central axis of the guide plate, the outer wall of the second limit rod is in contact with the inner wall of the limit seat, the second limit rod and the limit seat are slidingly connected, the first return spring is used to squeeze the second limit rod and the limit block and keep them moving inward, and the outer wall of the limit block is provided with a slope.

[0013] Preferably, the mounting mechanism includes an oiling rod, an oil outlet and a support plate, one end of the oiling rod is connected to an oil storage tank, one end of the oiling rod is provided with an oil outlet, a support plate is fixed inside the guide plate, a gear rod is movably connected inside the support plate, a second return spring is sleeved on the outside of the gear rod, and an oil delivery channel is provided inside the guide plate.

[0014] Preferably, the oil outlet holes are provided with two groups symmetrically distributed about the central axis of the oil outlet holes, the outer wall of the shift rod fits the inner wall of the support plate, and the shift rod and the support plate are slidably connected.

[0015] Preferably, the second return spring is used to squeeze the gear lever and keep it moving outward. The diameter of the contact surface between the gear lever and the oiling rod is larger than the diameter of the interface between the oiling rod and the guide plate. The oil delivery channel is provided with two groups of symmetrical distributions about the central axis of the guide plate. The output end of the oil delivery channel is connected to a second oiling cylinder.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention arranges the coordination of the first oiling cylinder, the guide rod, the oiling belt and other structures, so that the device can drive the oiling belt to move by starting the servo motor, and smear the lubricating oil attached to itself on the surface of the first oiling cylinder during movement, so that the first oiling cylinder can smear lubricating oil to the fitting surface of the wall attachment and the climbing frame assembly when climbing the frame, thereby achieving the purpose of facilitating the application of lubricating oil to the device and extending its service life.

[0017] The present invention cooperates with structures such as a connecting seat, a first limiting rod, and a first limiting plate, so that the device can quickly install and remove the oil tank by pressing the oil tank, so that the oil tank can be installed when the device is climbing the frame, avoiding the problem of the lubricating oil being located inside the device when not started, causing the lubricating oil to deteriorate rapidly and resulting in low lubrication efficiency, and can quickly replace and replenish the used oil tank.

[0018] The present invention cooperates with structures such as an oiling rod, an oil outlet hole, and a support plate, so that when the oil storage tank is pressed and installed, the oiling rod is inserted into the hole of the guide plate, the gear lever is squeezed, so that the oil outlet hole is located in the cavity inside the guide plate, and the valve on the oil storage tank is opened. At this time, the lubricating oil enters the interior of the guide plate through the oiling rod and the oil outlet hole, thereby achieving the purpose of automatically connecting the oil circuit after the oil storage tank is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall rear view structure of the present invention; Figure 3 This is a schematic structural diagram of the climbing formwork assembly of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of the local section at point A in the middle; Figure 5 It is a schematic diagram of the structure of the climbing formwork assembly of the present invention; Figure 6 Schematic diagram of the oiling mechanism structure of the present invention; Figure 7 Schematic diagram of the internal structure of the oiling mechanism of the present invention; Figure 8 It is a schematic diagram of the installation mechanism structure of the present invention; Figure 9 It is a schematic structural diagram of the disassembly and assembly mechanism of the present invention.

[0020] In the figure: 1. Climbing frame main body; 2. Wall attachment; 3. Guide rail; 4. Climbing frame assembly; 5. Hydraulic cylinder; 6. Guide plate; 7. Oiling mechanism; 701. First oiling cylinder; 702. Guide rod; 703. Oiling belt; 704. Second oiling cylinder; 705. First gear; 706. Oil inlet hole; 707. Servo motor; 708. Second gear; 8. Disassembly and assembly mechanism; 801. Connecting seat; 802. First limit rod; 803. First limit plate; 804. Second limit plate; 805. Limit seat; 806. Second limit rod; 807. First return spring; 808. Limit block; 9. Installation mechanism; 901. Oiling rod; 902. Oil outlet hole; 903. Support plate; 904. Gear lever; 905. Second return spring; 906. Oil transfer channel; 10. Oil storage tank. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figures 1 to 9 As shown, the present invention provides a hydraulic self-climbing formwork device for thin-walled hollow piers in bridge construction, comprising a climbing frame main body 1, a wall attachment part 2 being fixed to the outside of the climbing frame main body 1, a guide rail 3 being provided at one end of the wall attachment part 2, a climbing frame assembly 4 being installed inside the wall attachment part 2, a hydraulic cylinder 5 being fixed to the top of the climbing frame assembly 4, a guide plate 6 being fixed to the outside of the climbing frame assembly 4, an oiling mechanism 7 being installed inside the guide plate 6, an oil storage tank 10 being provided outside the guide plate 6, a disassembly and assembly mechanism 8 being installed outside the oil storage tank 10, and an installation mechanism 9 being installed at one end of the oil storage tank 10.

[0023] The above solution is adopted: by starting the hydraulic cylinder 5 to squeeze the climbing frame assembly 4, the climbing frame assembly 4 is brought into contact with the guide rail 3 and climbs. This principle is the existing technology in this field and will not be elaborated here.

[0024] like Figures 1 to 8 As shown, the oiling mechanism 7 includes a first oiling cylinder 701, a guide rod 702 and an oiling belt 703. The first oiling cylinder 701 is rotatably connected to the inside of the guide plate 6, the guide rod 702 is rotatably connected to the inside of the guide plate 6, the outer portion of the guide rod 702 is sleeved with an oiling belt 703, and the inside of the guide plate 6 is rotatably connected to the second oiling cylinder 704. Four groups of first oiling cylinders 701 are provided, and the first oiling cylinders 701 are symmetrically distributed about the central axis of the oiling belt 703. Four groups of guide rods 702 are provided, and the outer portion of the guide rod 702 is meshedly connected to the oiling belt 703, and the inner portion of the oiling belt 703 is meshedly connected to the second oiling cylinder 704. An oil outlet is provided in the contact section between the second oiling cylinder 704 and the oiling belt 703.

[0025] like Figures 1 to 8 As shown, a first gear 705 is fixed to the outside of the second oiling cylinder 704, one end of the second oiling cylinder 704 is connected to an oil inlet hole 706, a servo motor 707 is fixed to the outside of the guide plate 6, and a second gear 708 is fixed to the rotating end of the servo motor 707. The second oiling cylinder 704 and the first gear 705 are provided in two groups, and the second oiling cylinder 704 and the first gear 705 are symmetrically distributed about the central axis of the servo motor 707. The first gear 705 and the second gear 708 are meshed and connected, and the outer wall of the first oiling cylinder 701 is in contact with the inner wall of the wall attachment 2.

[0026] The above scheme is adopted: by starting the servo motor 707, the servo motor 707 drives the second gear 708 to rotate, and then the two groups of first gears 705 and the second oiling cylinder 704 are driven to rotate in the same direction through the second gear 708, and the rotation of the second oiling cylinder 704 synchronously drives the oiling belt 703 to move, and the contact section between the second oiling cylinder 704 and the oiling belt 703 is provided with an oil outlet, and the lubricating oil inside the second oiling cylinder 704 can be soaked into the oiling belt 703 through the oil outlet hole. At the same time, multiple groups of first oiling cylinders 701 are fitted on the outside of the oiling belt 703. After the lubricating oil is transferred to the first oiling cylinder 701 through the oiling belt 703, the first oiling cylinder 701 applies lubricating oil to the fitting surface of the wall attachment 2 and the climbing frame assembly 4.

[0027] like Figures 1 to 9As shown, the disassembly and assembly mechanism 8 includes a connecting seat 801, a first limiting rod 802 and a first limiting plate 803. The connecting seat 801 is fixed to the outside of the oil storage tank 10. The first limiting rod 802 is fixed to the outside of the connecting seat 801, and the first limiting plate 803 is fixed to the outside of the first limiting rod 802. The outside of the first limiting rod 802 is sleeved with a second limiting plate 804. There are two groups of connecting seats 801, and the connecting seats 801 are symmetrically distributed about the central axis of the oil storage tank 10. The outer wall of the first limiting rod 802 fits the inner wall of the second limiting plate 804. The first limiting rod 802 and the second limiting plate 804 are slidably connected, and the diameter of the second limiting plate 804 is larger than the diameter of the first limiting plate 803.

[0028] like Figures 1 to 9 As shown, the guide plate 6 is fixed with a limiting seat 805 on the outside, and the limiting seat 805 is movably connected to the second limiting rod 806 on the inside. The second limiting rod 806 is sleeved with a first return spring 807 on the outside, and the second limiting rod 806 is fixed with a limiting block 808 on the outside. The limiting seat 805 is provided with two groups of symmetrical distributions about the central axis of the guide plate 6. The outer wall of the second limiting rod 806 fits the inner wall of the limiting seat 805. The second limiting rod 806 and the limiting seat 805 are slidingly connected. The first return spring 807 is used to squeeze the second limiting rod 806 and the limiting block 808 and keep them moving inward. The outer wall of the limiting block 808 is provided with an inclined surface.

[0029] The above scheme is adopted: by pressing the oil storage tank 10, the first limit plate 803 is close to the limit block 808, the first limit plate 803 squeezes the limit block 808, and the limit block 808 contracts inward. After the first limit plate 803 passes, the first return spring 807 resets the limit block 808, so that the limit block 808 limits the first limit plate 803, and then limits the oil storage tank 10. When it is necessary to remove the oil storage tank 10 to replenish the lubricating oil inside the oil storage tank 10, continue to press the oil storage tank 10 so that the second limit plate 804 is close to the limit block 808, the second limit plate 804 squeezes the limit block 808, and the limit block 808 contracts inward. After the second limit plate 804 passes, the first return spring 807 resets the limit block 808, and the limit block 808 can lift the second limit plate 804. At this time, pulling the oil storage tank 10 can quickly remove the oil storage tank 10.

[0030] like Figures 1 to 8As shown, the mounting mechanism 9 includes an oiling rod 901, an oil outlet 902 and a support plate 903. One end of the oiling rod 901 is connected to the oil storage tank 10, and an oil outlet 902 is provided at one end of the oiling rod 901. The support plate 903 is fixed inside the guide plate 6, and the support plate 903 is movably connected to a gear rod 904 inside. The oil outlet 902 is provided with two groups of symmetrically distributed oil outlet holes 902 about the central axis of the oil outlet hole 902. The outer wall of the gear rod 904 fits the inner wall of the support plate 903, and the gear rod 904 and the support plate 903 are slidably connected.

[0031] like Figures 1 to 8 As shown, the outer sleeve of the gear lever 904 is provided with a second return spring 905, and the inner part of the guide plate 6 is provided with an oil delivery channel 906. The second return spring 905 is used to squeeze the gear lever 904 and keep it moving outward. The diameter of the contact surface between the gear lever 904 and the oiling rod 901 is larger than the diameter of the interface between the oiling rod 901 and the guide plate 6. The oil delivery channel 906 is provided with two groups of symmetrical distributions about the central axis of the guide plate 6. The output end of the oil delivery channel 906 is connected to the second oiling cylinder 704.

[0032] The above scheme is adopted: when pressing and installing the oil storage tank 10, the oiling rod 901 is inserted into the hole of the guide plate 6, squeezing the gear rod 904 so that the oil outlet 902 is located in the cavity inside the guide plate 6, and the valve on the oil storage tank 10 is opened. At this time, the lubricating oil enters the interior of the guide plate 6 through the oiling rod 901 and the oil outlet 902, and is transported to the interior of the second oiling cylinder 704 through the oil delivery channel 906, thereby completing the replenishment of the lubricating oil. When replacing and removing the oil storage tank 10, the oiling rod 901 is pulled back, and the gear rod 904 is no longer squeezed. At this time, the gear rod 904 is reset by the restoring force of the second reset spring 905, so that it blocks the interface between the guide plate 6 and the oiling rod 901.

[0033] The working principle and use process of the present invention are as follows: by starting the hydraulic cylinder 5 to squeeze the climbing frame assembly 4, the climbing frame assembly 4 is brought into contact with the guide rail 3 to climb, and by pressing the oil storage tank 10, the first limit plate 803 is brought close to the limit block 808, and the first limit plate 803 squeezes the limit block 808. At this time, the limit block 808 contracts inwardly. After the first limit plate 803 passes, the first return spring 807 resets the limit block 808, so that the limit block 808 limits the first limit plate 803, and then limits the oil storage tank 10. When it is necessary to remove the oil storage tank 10 to replenish the lubricating oil inside the oil storage tank 10, continue to press the oil storage tank 10 so that the second limit plate 803 is close to the limit block 808. 04 approaches the limit block 808, and the second limit plate 804 squeezes the limit block 808. At this time, the limit block 808 contracts inward. After the second limit plate 804 passes, the first return spring 807 resets the limit block 808. At this time, the limit block 808 can lift the second limit plate 804. At this time, the oil storage tank 10 can be quickly removed by pulling it. When pressing to install the oil storage tank 10, the oiling rod 901 is inserted into the hole of the guide plate 6, squeezing the gear lever 904 so that the oil outlet 902 is located in the cavity inside the guide plate 6, and the valve on the oil storage tank 10 is opened. At this time, the lubricating oil passes through the oiling rod 901 and the oil outlet 902. The oil enters the interior of the guide plate 6 and is transported to the interior of the second oiling cylinder 704 through the oil delivery channel 906, thereby completing the replenishment of the lubricating oil. When replacing and removing the oil storage tank 10, the oiling rod 901 is pulled back, and the gear lever 904 is no longer squeezed. At this time, the gear lever 904 is reset by the restoring force of the second return spring 905, so that it blocks the interface between the guide plate 6 and the oiling rod 901. After the oil circuit is connected, the servo motor 707 is started, and the servo motor 707 drives the second gear 708 to rotate, and then drives the two sets of first gears 705 and the second oiling cylinder 704 to rotate in the same direction through the second gear 708, and the rotation of the second oiling cylinder 704 The oiling belt 703 is driven to move synchronously, and an oil outlet is provided at the contact section between the second oiling cylinder 704 and the oiling belt 703. The lubricating oil inside the second oiling cylinder 704 can be soaked into the oiling belt 703 through the oil outlet. At the same time, multiple groups of first oiling cylinders 701 are fitted on the outside of the oiling belt 703. After the lubricating oil is transferred to the first oiling cylinder 701 through the oiling belt 703, the first oiling cylinder 701 applies lubricating oil to the fitting surface of the wall attachment 2 and the climbing frame assembly 4, forming an oil film on the friction surface, isolating the metal from direct contact, reducing the friction coefficient, extending the service life of the device, and avoiding strong wind weather that may cause the template to shake during high pier construction.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic self-climbing formwork device for thin-walled hollow piers in bridge construction, comprising a climbing frame body (1), characterized in that: A wall attachment part (2) is fixed to the outside of the climbing frame body (1), a guide rail (3) is provided at one end of the wall attachment part (2), a climbing frame assembly (4) is installed inside the wall attachment part (2), a hydraulic cylinder (5) is fixed to the top of the climbing frame assembly (4), a guide plate (6) is fixed to the outside of the climbing frame assembly (4), an oiling mechanism (7) is installed inside the guide plate (6), an oil storage tank (10) is provided outside the guide plate (6), a disassembly mechanism (8) is installed outside the oil storage tank (10), and a mounting mechanism (9) is installed at one end of the oil storage tank (10); The oiling mechanism (7) comprises a first oiling cylinder (701), a guide rod (702) and an oiling belt (703); the first oiling cylinder (701) is rotatably connected to the inside of the guide plate (6); the guide rod (702) is rotatably connected to the inside of the guide plate (6); and the outside of the guide rod (702) is provided with an oiling belt (703); The disassembly and assembly mechanism (8) comprises a connecting seat (801), a first limiting rod (802) and a first limiting plate (803); the connecting seat (801) is fixed to the outside of the oil storage tank (10); the first limiting rod (802) is fixed to the outside of the connecting seat (801); and the first limiting plate (803) is fixed to the outside of the first limiting rod (802).

2. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 1 is characterized in that: The guide plate (6) is internally rotatably connected to a second oiling cylinder (704), the second oiling cylinder (704) is externally fixed with a first gear (705), one end of the second oiling cylinder (704) is connected to an oil inlet hole (706), a servo motor (707) is externally fixed to the guide plate (6), and a second gear (708) is fixed to the rotating end of the servo motor (707).

3. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 2 is characterized in that: The first oiling cylinders (701) are provided in four groups, and the first oiling cylinders (701) are symmetrically distributed about the central axis of the oiling belt (703). The guide rods (702) are provided in four groups, and the outer portion of the guide rods (702) is meshedly connected to the oiling belt (703), and the inner portion of the oiling belt (703) is meshedly connected to the second oiling cylinders (704). The contact section between the second oiling cylinders (704) and the oiling belt (703) is provided with an oil outlet.

4. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 2, characterized in that: The second oiling cylinder (704) and the first gear (705) are provided in two groups. The second oiling cylinder (704) and the first gear (705) are symmetrically distributed about the central axis of the servo motor (707). The first gear (705) and the second gear (708) are meshed and connected. The outer wall of the first oiling cylinder (701) is in contact with the inner wall of the wall attachment member (2).

5. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 1 is characterized in that: The first limiting rod (802) is externally sleeved with a second limiting plate (804), the guide plate (6) is externally fixed with a limiting seat (805), the limiting seat (805) is internally movably connected with a second limiting rod (806), the second limiting rod (806) is externally sleeved with a first return spring (807), and the second limiting rod (806) is externally fixed with a limiting block (808).

6. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 5, characterized in that: The connecting seats (801) are provided in two groups. The connecting seats (801) are symmetrically distributed about the central axis of the oil storage tank (10). The outer wall of the first limiting rod (802) fits the inner wall of the second limiting plate (804). The first limiting rod (802) and the second limiting plate (804) are slidably connected. The diameter of the second limiting plate (804) is larger than the diameter of the first limiting plate (803).

7. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 5, characterized in that: The limiting seat (805) is provided with two groups of symmetrically distributed about the central axis of the guide plate (6); the outer wall of the second limiting rod (806) is in contact with the inner wall of the limiting seat (805); the second limiting rod (806) and the limiting seat (805) are slidably connected; the first return spring (807) is used to squeeze the second limiting rod (806) and the limiting block (808) and keep them moving inward; the outer wall of the limiting block (808) is provided with an inclined surface.

8. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 1, characterized in that: The mounting mechanism (9) comprises an oiling rod (901), an oil outlet hole (902) and a support plate (903); one end of the oiling rod (901) is connected to an oil storage tank (10); one end of the oiling rod (901) is provided with an oil outlet hole (902); the support plate (903) is fixed inside the guide plate (6); the support plate (903) is movably connected inside the gear lever (904); the gear lever (904) is sleeved with a second return spring (905); and the guide plate (6) is provided with an oil delivery channel (906).

9. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 8, characterized in that: The oil outlet holes (902) are provided with two groups symmetrically distributed about the central axis of the oil outlet holes (902); the outer wall of the shift rod (904) fits the inner wall of the support plate (903); and the shift rod (904) and the support plate (903) are slidably connected.

10. The thin-walled hollow pier hydraulic self-climbing formwork device for bridge construction according to claim 8, characterized in that: The second return spring (905) is used to squeeze the gear lever (904) and keep it moving outward. The diameter of the contact surface between the gear lever (904) and the oiling rod (901) is larger than the diameter of the interface between the oiling rod (901) and the guide plate (6). The oil delivery channel (906) is provided with two groups of symmetrically distributed about the central axis of the guide plate (6). The output end of the oil delivery channel (906) is connected to the second oiling cylinder (704).

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