A height-adjustable dual hydraulic self-balancing push-pushing pressure auxiliary device

Abstract

The present invention discloses a height-adjustable dual-hydraulic self-balancing jacking pressure auxiliary device, which relates to the field of construction equipment. It comprises a main hydraulic cylinder and a liftable piston plate located on the upper part of the main hydraulic cylinder, a pressure eccentric support fixed to the top surface of the liftable piston plate, and four vertically arranged jacks are provided on the outer side of the pressure eccentric support, and the four jacks are symmetrically distributed on two orthogonal straight lines. The upper part of the pressure eccentric support is spherical, and its spherical surface is in point contact with the lower surface of the upper pressure plate. The upper pressure plate is placed on the top of the piston rods of the four jacks and the pressure eccentric support. This device is not only easy to disassemble and install, but also has a relatively high adjustable height. It can solve the problems of beam bottom deformation and steel pipe pile buckling during the jacking process, and can be recycled and has strong adaptability. For bridges constructed using walking-type jacking, this device has a significant effect on protecting equipment and jacking objects.

Description

Technical Field

[0001] The present invention relates to the field of building construction equipment, and further relates to a height-adjustable double-hydraulic self-balancing jacking and pressure-bearing auxiliary device in bridge construction. Background Art

[0002] With the continuous development of long-span bridges in my country, construction techniques and technologies have also advanced rapidly. The jacking construction method has played an indispensable role in complex construction environments, when navigation needs to be maintained during construction, and when construction areas are located in mountainous areas. The multi-point walking jacking method is particularly widely used. Its construction process mainly includes four steps: "jacking up, advancing, lowering, and resetting."

[0003] In the more commonly used walking-type jacking construction, it is often necessary to build temporary piers and place jacking equipment on the upper platform of the temporary piers. However, due to the working principle of the jacking equipment, the steel pipes of the temporary piers are often subjected to eccentric pressure, and during the beam dropping stage, the bottom of the beam is often uneven due to factors such as the deviation of the beam section, the horizontal slope and longitudinal slope of the beam bottom, etc., and the contact area between the jacking device and the steel beam will be reduced. Even if there is a pad, the bottom of the steel beam will be damaged.

[0004] At present, in the process of walking-type jacking construction, most people use artificially added steel pads or wooden pads to increase the contact area between the steel beam bottom plate and the jacking device. This method is time-consuming and labor-intensive, and has many operating steps. Moreover, in actual projects, this method cannot well ensure that the steel beam bottom plate and the jacking device jack can be in good contact, causing local damage to the steel beam bottom plate. Moreover, when using traditional jacks as pressure auxiliary devices, there is also the problem that the steel beam bottom plate and the jack cannot fully contact, causing local damage to the steel beam bottom plate.

[0005] In addition, in the "dropping" step of the jacking process, the bottom plate of the steel beam falls on the dropping beam of the jacking device, and in many cases it will stay in this working condition for a long time. In actual projects, the jacking device is generally on a temporary pier built with steel pipe piles. The long stay will cause serious eccentric compression on the temporary pier steel pipe piles, which will pose a great hidden danger to the stability of the temporary pier and the safety of the steel beam.

[0006] Generally speaking, in the existing common walking-type jacking construction process, due to the different structures and sizes of steel beams, the layout of temporary piers is different. The jacking device is placed on the temporary pier, and the force is usually applied to the steel pipes at the four corner points at the bottom. How to ensure the stability of the temporary pier and the safety of the steel beam during the construction process is an issue that cannot be ignored. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a jacking pressure auxiliary device to address the deficiencies of the existing technology, which can ensure the stability of the temporary pier and the safety of the steel beam during the construction process.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: it includes a main hydraulic cylinder and a liftable piston plate located on the upper part of the main hydraulic cylinder, a compressed eccentric support is fixed to the top surface of the liftable piston plate, and at least three vertically arranged jacks are provided on the outside of the compressed eccentric support, and multiple jacks are evenly distributed on the outside of the compressed eccentric support. The upper pressure plate is placed on the top of the piston rods of the multiple jacks and the compressed eccentric support. The height of the liftable piston plate can be adjusted by the main hydraulic cylinder, and the multiple jacks on the liftable piston plate can also be adjusted in height, thereby achieving dual adjustment, so that the height adjustment of the device is not limited to the lifting height of a single jack. When the multiple jacks located at different positions are adjusted to different heights, the upper pressure plate can present different inclinations to fit the bottom plate of the steel beam placed on it, and then combined with the compressed eccentric support to achieve self-balancing. When the bottom plate of a steel beam falls on the upper pressure plate, the upper pressure plate can be aligned with the bottom plate of the steel beam by adjusting the multiple jacks, increasing the contact area between the two. The multiple jacks can also balance the pressure. This device occupies a small space and can therefore be placed on a temporary pier. It can not only share a certain amount of pressure with the main jack of the walking jacking device, but also effectively protect the bottom of the steel beam. It can be placed directly above the temporary pier steel pipe piles, effectively improving the eccentric pressure on the temporary pier steel pipe piles under the action of the walking jacking device, and better protecting the stability of the steel pipe piles.

[0009] Furthermore, the upper portion of the eccentric pressure bearing is spherical, and its spherical surface is in point contact with the lower surface of the upper pressure plate. The top of the eccentric pressure bearing can provide support for the top plate when the upper pressure plate contacts the lower surface of the steel beam bottom plate, and evenly distribute the pressure of the steel beam bottom plate on the upper pressure plate to the liftable piston plate. The jack and the eccentric pressure bearing cooperate to help the upper pressure plate achieve self-balancing according to the flatness of the bottom of the beam body.

[0010] Furthermore, there are four jacks, which are symmetrically arranged around the compressed eccentric support, making the device more convenient to adjust.

[0011] Furthermore, the bottoms of the plurality of jacks are fixedly connected to the liftable piston plate, and the tops of the piston rods of the plurality of jacks are fixedly connected to the upper pressure plate. After welding, the liftable piston plate, the plurality of jacks, and the upper pressure plate form a whole, which can make the device more stable.

[0012] Furthermore, the main hydraulic cylinder has an oil outlet below the liftable piston plate, a pressure gauge at the outlet, and an oil inlet below the outlet. The pressure gauge can precisely control the height of the first jack, making the device more precisely adjustable.

[0013] Furthermore, a limiting device for supporting the liftable piston plate when unloaded is provided on the inner wall of the main hydraulic cylinder between the liftable piston plate and the oil outlet. When unloaded, the liftable piston plate can fall on the limiting device.

[0014] Furthermore, the main hydraulic oil cylinder is arranged on a pad, and falls on the temporary pier through the pad, which can reduce the unit pressure of the temporary pier, thereby playing a protective role for the temporary pier.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the present invention sets a compressed eccentric support on the liftable piston plate on the upper part of the main hydraulic cylinder, and sets a plurality of vertically arranged jacks on the outside of the compressed eccentric support. By adjusting the main hydraulic cylinder and the plurality of vertically arranged jacks, the adjustment height of the device is not limited to the lifting height of a single jack, and has a higher adjustment height, realizing the function of dual adjustment. By adjusting the plurality of jacks to different heights, the upper pressure plate can be made to have different inclinations. When a steel beam bottom plate falls on the upper pressure plate, by adjusting the plurality of jacks, the upper pressure plate can be made to fit with the steel beam bottom plate, thereby increasing the force area, reducing the pressure of the jack of the jacking device, and protecting the bottom of the beam from local deformation due to excessive force; at the same time, it can reduce the eccentric pressure on the temporary pier steel pipe and protect the steel pipe from local buckling caused by eccentric pressure. This device is simple to assemble and can solve the problems of beam bottom deformation and buckling of temporary pier steel pipe piles during jacking. It is also reusable, easy to disassemble and install, and highly adaptable. For bridges constructed using walking jacking, this device plays a significant role in protecting equipment and the objects being jacked. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view of a pushing and pressure auxiliary device in one embodiment of the present invention.

[0017] Figure 2 This is a top view of the auxiliary pressure-pushing device after the upper pressure plate is removed in one embodiment of the present invention.

[0018] Figure 3 Schematic diagram of a push-pressure auxiliary device in one embodiment of the present invention.

[0019] Among them, 1 is the upper pressure plate, 2 is the jack, 3 is the eccentric pressure support, 4 is the liftable piston plate, 5 is the limit device, 6 is the oil pressure gauge, 7 is the inner wall of the main hydraulic cylinder, 8 is the oil outlet, 9 is the oil inlet, 10 is the pad, and 11 is the main hydraulic cylinder. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, an embodiment of the present invention includes a main hydraulic cylinder 11, an upper pressure plate 1, a jack 2, an eccentric pressure support 3, a liftable piston plate 4, a limit device 5 and a pad 10.

[0021] The liftable piston plate 4 is arranged on the upper part of the main hydraulic cylinder 11. The support component 3 is fixed above the liftable piston plate 4. The top surface of the liftable piston plate 4 is fixed with a compressed eccentric support 3. Four vertically arranged jacks 2 are provided on the outside of the compressed eccentric support 3. The four jacks 2 are symmetrically and evenly distributed on the outside of the compressed eccentric support 3, and the bottoms of the four jacks 2 are welded to the upper surface of the liftable piston plate 4. The upper pressure plate 1 is welded to the tops of the piston rods of the four jacks 2. The upper part of the compressed eccentric support 3 is spherical, and its spherical surface is in point contact with the lower surface of the upper pressure plate 1.

[0022] The main hydraulic cylinder 11 is provided with a limit device 5, an oil outlet 8 and an oil inlet 9 on its inner wall 7. The limit device 5 is located below the liftable piston plate 4. When unloaded, the liftable piston plate falls on the limit device 5, the oil outlet 8 is located below the limit device 5, and the oil inlet 9 is located below the oil outlet 8. The oil pressure gauge 6 is located at the portion of the oil outlet 8 extending outside the cavity. During the use of this device, hydraulic oil enters through the oil inlet 9 and exits through the oil outlet 8, and the oil pressure gauge 6 controls the reading, thereby precisely controlling the adjustment height of the liftable piston plate 4.

[0023] The backing plate 10 is disposed below the main hydraulic cylinder 11 .

[0024] During on-site construction, this device can be deployed according to the on-site conditions. During the beam dropping stage, this device is placed on the temporary pier pipe pile. When this device contacts the bottom plate of the steel beam, by adjusting the height of the four jacks 2 and then controlling the oil pressure gauge 6, the adjustment height of the main hydraulic cylinder can be accurately controlled. Without using a traditional pad, this device can achieve a larger contact area with the bottom plate of the steel beam, so that the upper pressure plate 1 is in full contact with the bottom plate of the steel beam, increasing the effective pressure area, thereby increasing the force area, reducing the pressure of the jack of the jacking device, and protecting the bottom of the beam from local deformation caused by excessive force. At the same time, it can reduce the eccentric pressure on the temporary pier steel pipe and protect the steel pipe from local buckling caused by eccentric pressure. At the same time, the eccentric pressure support 3 can distribute the pressure of the steel beam to the liftable piston plate 4 without direct contact with the bottom plate of the steel beam, further protecting the main jack of the walking jacking device.

Claims

1. A height-adjustable dual hydraulic self-balancing jacking and pressure-assisted device, comprising a main hydraulic cylinder (11) and a liftable piston plate (4) located above the main hydraulic cylinder, characterized in that: A pressure-bearing eccentric support (3) is fixed to the top surface of the liftable piston plate (4), and at least three vertically arranged jacks (2) are provided on the outside of the pressure-bearing eccentric support (3), and the plurality of jacks (2) are evenly distributed on the outside of the pressure-bearing eccentric support (3); the upper pressure plate (1) is placed on the tops of the piston rods of the plurality of jacks (2) and the pressure-bearing eccentric support (3); The upper portion of the compressed eccentric support (3) is spherical, and its spherical surface is in point contact with the lower surface of the upper pressure plate (1); The bottoms of the plurality of jacks (2) are fixedly connected to the liftable piston plate (4), and the tops of the piston rods of the plurality of jacks (2) are fixedly connected to the upper pressure plate (1); wherein the plurality of jacks (2) are adjusted to different heights so that the upper bearing plate (1) exhibits different inclinations; The main hydraulic cylinder (11) is provided with a limit device (5), an oil outlet (8) and an oil inlet (9) on its inner wall (7). The limit device (5) is located below the liftable piston plate (4). When unloaded, the liftable piston plate falls on the limit device (5). The oil outlet (8) is located below the limit device (5), and the oil inlet (9) is located below the oil outlet (8). The oil pressure gauge (6) is located at the portion of the oil outlet (8) extending outside the cavity of the main hydraulic cylinder (11).

2. The height-adjustable dual hydraulic self-balancing push-pushing pressure auxiliary device according to claim 1, characterized in that: There are four jacks (2), and the four jacks (2) are symmetrically arranged around the compressed eccentric support (3).

3. The height-adjustable dual hydraulic self-balancing push-pushing pressure auxiliary device according to claim 1, characterized in that: The main hydraulic cylinder (11) is provided with an oil outlet (8) below the liftable piston plate (4), an oil pressure gauge (6) is provided at the oil outlet (8), and the main hydraulic cylinder (11) is provided with an oil inlet (9) below the oil outlet (8).

4. The height-adjustable dual hydraulic self-balancing push-pushing pressure auxiliary device according to claim 3, characterized in that: The main hydraulic oil cylinder (11) is provided with a limiting device (5) between the liftable piston plate (4) and the oil outlet (8) for supporting the liftable piston plate (4) when unloaded.

5. The height-adjustable dual hydraulic self-balancing push-pushing pressure auxiliary device according to any one of claims 1 to 4, characterized in that: The main hydraulic cylinder (11) is arranged on the backing plate (10).

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