Bridge deck slab lifting device for pier heightening in limited space

Abstract

The invention relates to a bridge deck slab lifting device for heightening piers in a limited space, a bridge deck slab is formed by splicing a plurality of bridge deck slab sections distributed in the longitudinal bridge direction, the two ends of each bridge deck slab section are supported on a cover beam respectively, the cover beams are supported by a plurality of piers, and the bridge deck slab lifting device is characterized by comprising at least three jacking units, the jacking unit comprises a first jack, a second jack, a cushion block and a height-adjustable suspension cage; the cage body is formed by splicing a plurality of vertical pipe sections of a frame structure, the objective table is lifted through a winch connected in the uppermost vertical pipe section and located in the cage body, the third jack is arranged at the top of the uppermost vertical pipe section, a lower inlet-outlet door is arranged at the lower end of the cage body, and an upper inlet-outlet door is arranged at the upper end of the cage body. The bridge deck lifting device has the advantage of being capable of being used for lifting the bridge deck and is used for solving the problem that lifting of the bridge deck of a prefabricated bridge is inconvenient.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a bridge deck lifting device for connecting piers in a confined space. Background Art

[0002] During the road construction process, there will be a need to raise the bridge. For bridges with cast-in-place bridge decks, the entire bridge deck needs to be discarded and the piers retained. The piers are then processed to the set height before the bridge deck is recast. For prefabricated structures, in order to reduce costs, the bridge deck is first lifted, and then the piers are processed so that the bridge deck is re-supported on the piers, that is, the bridge deck is retained when the bridge is raised. At this time, due to the high height of the bridge, some jacks are directly supported on the ground, but there are no jacks that high. At this time, the bridge deck can only be supported by the cap beam support jacks. However, due to the space limitation between the cap beam and the bridge deck, the bridge deck cannot be lifted to the set height with a short jack, and the high jack cannot be installed, resulting in inconvenient construction. Summary of the Invention

[0003] The present invention provides a bridge deck lifting device for connecting bridge piers in a confined space, which can be used to lift the top of the bridge deck, and is used to solve the problem of inconvenience in lifting the bridge deck of a prefabricated bridge.

[0004] The above technical problems are solved by the following technical solutions: a bridge deck lifting device for connecting piers in confined spaces, wherein the bridge deck is spliced together by a number of bridge deck segments distributed in the longitudinal direction of the bridge, and both ends of the bridge deck segments are supported on a cap beam, and the cap beam is supported by a number of bridge piers. The device is characterized in that it includes at least three lifting units, and the lifting unit includes a first jack, a second jack, a pad and a height-adjustable cage, and the cage includes a cage body spliced together by a number of vertical pipe segments of a frame structure, a loading platform located in the cage body and lifted and lowered by a winch connected to the uppermost vertical pipe segment, and a third jack arranged on the top of the uppermost vertical pipe segment, the lower end of the cage body is provided with a lower entry door, and the upper end is provided with an upper entry door, and the cage body supports the vertical pipe segment when in use. On a newly built pedestal supported on newly built foundation piles; the length of the first jack is lower than the length of the second jack, the height of the pad is higher than the length of the second jack, the length of the first jack when extended to the limit position is higher than the height of the pad, and the length of the first jack is lower than the height of the gap between the lower surface of the bridge deck segment and the upper surface of the cap beam; the process of lifting the bridge deck is as follows: first, a first newly built pedestal supported on the first newly built foundation pile is built below the first pier starting from one end of the bridge, and a second newly built pedestal supported on the second newly built foundation pile is built below the second pier close to the first pier; the first cage is supported on the first newly built pedestal and the height is adjusted to meet the requirements, and an access door is installed on the first cage and the cap beam of the first pier. Build the first transport bridge between them, support the second cage on the second newly built pedestal and adjust the height to meet the requirements, build the second transport bridge between the upper access door of the second cage and the cap beam of the second pier; the personnel, the first jack, the second jack and the pads enter the loading platform from the lower access door of the first cage, are lifted up and then transported from the upper access door and the first transport bridge to the cap beam of the first pier, enter the loading platform from the lower access door of the second cage, are lifted up and then transported from the upper access door and the second transport bridge to the cap beam of the second pier, first support the two ends of the first bridge deck segment to the set height by the first jack on the cap beam of the first pier and the cap beam of the second pier, and support the pads on the first bridge deck After the two ends of the plate segment are lifted, the first jack is removed, and then the two ends of the first bridge deck segment are lifted to the set height by the second jack; the first cage and the second cage are raised and the two ends of the first bridge deck segment are supported by the third jack, and then the first pier is raised to support one end of the first bridge deck segment, and the cage on the first newly built pedestal is removed; the second bridge deck segment is lifted to the set height by the same method, and the second pier is raised to support the other end of the first bridge deck segment and one end of the second bridge deck segment, and the second cage and the cage supporting one end of the second bridge deck segment are removed; and so on, all bridge deck segments are lifted and all piers are raised to the set height.This technical solution utilizes a cage to transfer objects to the cap beam and, through the cap beam, to support the bridge deck segments that have been lifted into place. This allows the cage to serve two purposes, resolving the inconvenience of transporting objects to the cap beam. Direct lifting without the cage prevents the cage from being subjected to the forces of the lifting bridge deck as it rises, potentially causing bending, damage, and tipping.

[0005] Preferably, the jacking unit also includes four jacking cylinders distributed on the four corners of the cage, the lower end of the vertical pipe section is provided with a plurality of lower connecting ears with lower bolt holes, and the upper end is provided with a plurality of upper connecting ears with upper bolt holes, and the adjacent vertical pipe sections are fixed together by connecting bolts through the upper bolt holes and the lower bolt holes, and then connected with the pipe section connecting nuts. The four corners of the vertical pipe section are provided with oil cylinder connecting ears, and the lower inlet and outlet door is provided on the vertical pipe section located at the bottom. When in use, the vertical pipe section located at the bottom is fixed together with the newly built foundation; the method for raising the cage is: the pipe section connecting nuts and pipe section connecting bolts connecting the second vertical pipe section from the bottom to the top and the first vertical pipe section are removed, the lower ends of the four jacking cylinders are fixed on the newly built foundation, and the upper ends are fixed together with the cylinder connecting ears on the second vertical pipe section, and the jacking connection step is performed; the process of the jacking connection step is: the jacking cylinder jacks and the vertical pipes except the first section of the vertical pipe are lifted. When all the sections are jacked up until the gap between the second vertical pipe section and the first vertical pipe section is greater than the length of one vertical pipe section, an added vertical pipe section is supported on the first vertical pipe section, and the jacking cylinder is lowered so that the second vertical pipe section is supported on the added vertical pipe section, and then the added vertical pipe is fixed to the second vertical pipe section. At this time, the added vertical pipe section becomes the second vertical pipe section, and the original second vertical pipe section becomes the third vertical pipe section; if only one vertical pipe section needs to be added, the added vertical pipe section is fixed to the first vertical pipe section; if more than two vertical pipe sections need to be added, the cylinder replacement step is performed, and then the jacking and connection step is performed, and the cylinder replacement step and the jacking and connection step are repeated until all vertical pipe sections that need to be connected are connected, and then the last added vertical pipe section is fixed to the first vertical pipe section; the specific process of the cylinder replacement step is: the jacking cylinder is disengaged from the third vertical pipe section, then retracted and connected to the cylinder connecting ear of the second vertical pipe section. Compared with the existing method of adding vertical pipe sections from above, this method of increasing the height of the cage body makes it easier to install the added vertical pipe sections, and there is no need to disassemble and install the winch.

[0006] Preferably, the lower end of the vertical pipe section is fixed to a support ring, and the peripheral edge of the support ring extends beyond the vertical pipe section to form the lower connecting lug and the oil cylinder connecting lug. Compared with the existing method of mounting the connecting lug on the side, the connection strength requirement between the connecting lug and the vertical pipe section is reduced.

[0007] Preferably, the oil cylinder connecting lug is provided with a vertical through-hole, and the piston rod of the jacking oil cylinder is provided with a vertical connecting pin. The jacking oil cylinder is connected to the vertical pipe section in such a manner that the vertical connecting pin is inserted into the vertical through-hole, and the piston rod of the jacking oil cylinder is supported below the oil cylinder connecting lug. During use, the jacking oil rod is raised and lowered to facilitate installation and removal of the jacking oil cylinder and the vertical pipe section.

[0008] Preferably, the head of the pipe joint connecting bolt faces upwards, so that when the pipe joint connecting nut falls off, the pipe joint connecting bolt can still play a connecting role, thereby improving safety during use.

[0009] Preferably, the four sides of the upper end of the cage are connected to the upper end of a steel cable, and the lower ends of the steel cables are connected to a tensioning mechanism. The four tensioning mechanisms are distributed on the four sides of the cage. This makes it more difficult for the cage to tip over during use. In particular, if the cage is found to have a tendency to tip to one side during the lifting process, it can be corrected by pulling the steel cable on the other side.

[0010] Preferably, the tensioning mechanism comprises a mounting base fixed to the newly constructed support and a hollow jack hinged to the mounting base via a horizontal hinge shaft, with the steel cable passing through the hollow jack. This provides a compact structure, facilitates tensioning, and can easily adapt to changes in the angle of the steel cable.

[0011] Preferably, the steel cable is connected to the upper end of the second vertical pipe section from the top, and the upper access door is provided on the vertical pipe section located at the top, so as to adapt to the use under the working condition where the space between the cap beam and the bridge deck is narrower.

[0012] Preferably, the lifting unit further comprises a bridge deck inclination detection structure, comprising a horizontal rod extending in the longitudinal direction of the bridge above the bridge deck segment supported by the cage and connected to the cage via a connecting rod, a vertical scale rod passing through the horizontal connecting rod, and a vertical pointer support rod passing through the horizontal connecting rod, wherein the vertical pointer support rod is connected to a pointer indicating the scale on the vertical scale rod, and when the lower ends of the vertical scale rod and the vertical pointer support rod are located on the same plane, the scale value on the vertical scale rod where the pointer is aligned is zero, and the scale value on the vertical scale rod is the inclination angle of the bridge deck segment; when the bridge deck segment is lifted, the inclination angle of the bridge deck segment is obtained through the bridge deck inclination detection structure, and the lifting speed at both ends of the bridge deck segment is controlled so that the inclination angle of the bridge deck segment is maintained at a set value and whether the inclination angle of the bridge deck segment when supported by the raised pier is consistent with the angle before lifting. This improves the technical solution for obtaining the longitudinal bridge inclination angle of the bridge deck in real time.

[0013] The present invention has the following advantages: the bridge deck can be conveniently lifted, thereby laying the foundation for raising the bridge piers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the present invention in use; Figure 2 for Figure 1 A partial schematic diagram of Figure 3 for Figure 2 A local enlarged schematic diagram of point A; Figure 4 for Figure 3 A local enlarged schematic diagram of point B; Figure 5 for Figure 3 A local enlarged schematic diagram of point C; Figure 6 for Figure 2 A local enlarged schematic diagram of point D; Figure 7 for Figure 6 A local enlarged schematic diagram of point E.

[0015] In the figure: bridge deck segment 1, cap beam 2, bridge pier 3, jacking unit 4, second jack 5, vertical pipe segment 6, cage 7, uppermost vertical pipe segment 8, winch 9, loading platform 10, third jack 11, new foundation pile 12, new abutment 13, first bridge pier 14, first new foundation pile 46, first new abutment 15, second bridge pier 16, second new foundation pile 17, second new abutment 18, first transport bridge 19, second transport bridge 20, first bridge deck segment 21, second bridge deck segment 22, jacking cylinder 23, lower connecting ear 24, Upper connecting ear 25, pipe section connecting bolt 26, pipe section connecting nut 27, head of pipe section connecting bolt 28, cylinder connecting ear 29, support ring 30, vertical through hole 31, piston rod of jacking cylinder 32, vertical connecting pin 33, steel cable 34, tensioning mechanism 35, mounting base 36, horizontal hinge shaft 37, hollow jack 38, bridge deck inclination detection structure 39, connecting rod 40, horizontal rod 41, vertical scale rod 42, vertical pointer support rod 43, scale 44, pointer 45, first section of vertical pipe 47, second section of vertical pipe 48, hoist cage 49. DETAILED DESCRIPTION

[0016] 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.

[0017] See also Figures 1 to 7A bridge deck lifting device for connecting piers in a confined space. The bridge deck is spliced together from a plurality of bridge deck segments 1 distributed in the longitudinal direction of the bridge. The two ends of the bridge deck segments are each supported on a cap beam 2, and the butted ends of adjacent bridge deck segments are supported on the same cap beam. The cap beam is supported by a plurality of bridge piers 3. The present invention includes at least three jacking units 4. The jacking units include a first jack, a second jack 5, a spacer, and a height-adjustable cage 49. The cage includes a cage body 7 formed by splicing together several vertical pipe sections 6 of a frame structure, a loading platform 10 located in the cage body which is raised and lowered by a winch 9 connected to the uppermost vertical pipe section 8, and a third jack 11 arranged on the top of the uppermost vertical pipe section. The lower end of the cage body is provided with a lower entrance door and the upper end is provided with an upper entrance door. When in use, the cage body is supported on a newly built pedestal 13 supported on newly built foundation piles 12; the length of the first jack is shorter than the length of the second jack, the height of the pad is greater than the length of the second jack, the length of the first jack when extended to the extreme position is greater than the height of the pad, and the length of the first jack is less than the height of the gap between the lower surface of the bridge deck segment and the upper surface of the cap beam. The process of lifting the bridge deck is as follows: first, a first new pedestal 15 supported on a first new foundation pile 46 is built below the first pier 14 starting from one end of the bridge, and a second new pedestal 18 supported on a second new foundation pile 17 is built below the second pier 16 close to the first pier; the first hoist cage is supported on the first new pedestal and the height is adjusted to meet the requirements, a first transport bridge 19 is built between the upper access door of the first hoist cage and the cap beam of the first pier, the second hoist cage is supported on the second new pedestal and the height is adjusted to meet the requirements, a second transport bridge 20 is built between the upper access door of the second hoist cage and the cap beam of the second pier; personnel, the first jack, the second jack and the pads are respectively lifted up after entering the loading platform from the lower access door of the first hoist cage, and then transported from the upper access door and the first transport bridge to the cap beam of the first pier, and lifted up after entering the loading platform from the lower access door of the second hoist cage, and then transported from the upper access door and the second transport bridge to On the cap beam of the second pier, first support the two ends of the first bridge deck segment 21 on the cap beam of the first pier and the cap beam of the second pier by the first jack to the set height, support the two ends of the first bridge deck segment with pads, remove the first jack, and then use the second jack to jack up the two ends of the first bridge deck segment to the set height; raise the first hoist cage and the second hoist cage and support the two ends of the first bridge deck segment by the third jack, then raise the first pier to support one end of the first bridge deck segment, and remove the hoist cage located on the first newly built pedestal; use the same method to lift the second bridge deck segment 22 to the set height, raise the second pier to support the other end of the first bridge deck segment and one end of the second bridge deck segment, remove the second hoist cage and the hoist cage supporting one end of the second bridge deck segment; and so on, lift all the bridge deck segments and raise all the piers to the set height.

[0018] The lifting unit also includes four lifting cylinders 23 located at the four corners of the cage. The lower ends of the vertical pipe sections are equipped with lower connecting lugs 24 with lower bolt holes, and the upper ends are equipped with upper connecting lugs 25 with upper bolt holes. Adjacent vertical pipe sections are secured together by connecting pipe section bolts 26 that pass through the upper and lower bolt holes and are then connected to pipe section connecting nuts 27. The heads 28 of the pipe section connecting bolts face upward. Cylinder connecting lugs 29 are located at the four corners of the vertical pipe sections. The lower inlet and outlet doors are arranged on the vertical pipe section at the bottom. When in use, the vertical pipe section at the bottom is fixed together with the newly built pedestal. The method for raising the cage is as follows: the pipe section connecting nuts and pipe section connecting bolts connecting the second vertical pipe section and the first vertical pipe section from the bottom up are removed, the lower ends of the four jacking cylinders are fixed on the newly built pedestal, and the upper ends are fixed together with the cylinder connecting ears on the second vertical pipe section, and the jacking connection step is performed; the process of the jacking connection step is: the jacking cylinder jacks up and jacks up all the vertical pipe sections except the first vertical pipe 47 until the gap between the second vertical pipe section 48 and the first vertical pipe section is greater than the length of one vertical pipe section, and an additional vertical pipe section is supported on the first vertical pipe section, and the jacking cylinder is lowered so that the second vertical pipe section After the vertical pipe section is supported on the added vertical pipe section, the added vertical pipe is fixed together with the second vertical pipe section. At this time, the added vertical pipe section becomes the second vertical pipe section, and the original second vertical pipe section becomes the third vertical pipe section. If only one vertical pipe section is needed, the added vertical pipe section is fixed together with the first vertical pipe section. If more than two vertical pipe sections need to be added, the cylinder replacement step is performed, and then the jacking connection step is performed. The cylinder replacement step and the jacking connection step are repeated until all vertical pipe sections that need to be connected are connected, and then the last added vertical pipe section is fixed together with the first vertical pipe section. The specific process of the cylinder replacement step is: the jacking cylinder is disengaged from the third vertical pipe section, then retracted and connected to the cylinder connection ear of the second vertical pipe section. This method of increasing the height of the cage body makes it easier to install the added vertical pipe section than the existing method of adding vertical pipe sections from above, and there is no need to disassemble and install the winch. The lower end of the pipe section is fixed to a support ring 30. The periphery of the support ring extends beyond the vertical pipe section to form a lower connecting ear and a cylinder connecting ear. The cylinder connecting ear is provided with a vertical through-hole 31, and the piston rod 32 of the jacking cylinder is provided with a vertical connecting pin 33. The jacking cylinder is connected to the vertical pipe section in the following manner: the vertical connecting pin is inserted into the vertical through-hole, and the piston rod of the jacking cylinder is supported below the cylinder connecting ear. The four sides of the upper end of the cage are connected to the upper end of a steel cable 34. The lower end of each steel cable is connected to a tensioning mechanism 35. Four tensioning mechanisms are located on each side of the cage. The tensioning mechanism consists of a mounting base 36 fixed to the newly constructed foundation and a hollow jack 38 hinged to the mounting base via a horizontal hinge 37. The steel cable is inserted into the hollow jack. The steel cable is connected to the upper end of the second vertical pipe section from the top. The upper access door is located on the uppermost vertical pipe section.

[0019] The jacking unit also includes a bridge deck inclination detection structure 39, which includes a horizontal rod 41 extending in the longitudinal direction of the bridge above the bridge deck segment supported by the cage and connected to the cage body 7 through a connecting rod 40, a vertical scale rod 42 passed through the horizontal connecting rod, and a vertical pointer support rod 43 passed through the horizontal connecting rod. The vertical pointer support rod is connected with a pointer 45 indicating the scale 44 on the vertical scale rod. When the lower ends of the vertical scale rod and the vertical pointer support rod are located on the same plane, the scale value on the vertical scale rod where the pointer is aligned is zero, and the scale value on the vertical scale rod is the inclination angle of the bridge deck segment. When jacking the bridge deck segment, the inclination angle of the bridge deck segment is obtained through the bridge deck inclination detection structure, and the jacking speed at both ends of the bridge deck segment is controlled so that the inclination angle of the bridge deck segment is maintained at the set value and whether the inclination angle of the bridge deck segment when supported by the raised pier is consistent with the angle before jacking.

Claims

1. A bridge deck lifting device for connecting bridge piers in confined spaces, wherein the bridge deck is formed by splicing a plurality of bridge deck segments distributed longitudinally of the bridge, each end of the bridge deck segment is supported on a cap beam, and the cap beam is supported by a plurality of bridge piers, characterized in that: The invention comprises at least three lifting units, each comprising a first jack, a second jack, a spacer, and a height-adjustable cage. The cage comprises a cage body formed by splicing together vertical pipe sections of a frame structure, a loading platform located within the cage body and raised and lowered by a winch connected to the uppermost vertical pipe section, and a third jack disposed on the top of the uppermost vertical pipe section. The cage body is provided with a lower access door at its lower end and an upper access door at its upper end. When in use, the cage body is supported on a newly built foundation supported on newly built foundation piles. The length of the first jack is shorter than that of the second jack, the height of the spacer is greater than that of the second jack, the length of the first jack when extended to its extreme position is greater than the height of the spacer, and the length of the first jack is less than the height of the gap between the lower surface of the bridge deck segment and the upper surface of the cap beam. The process of raising the bridge deck is as follows: first, a first new bearing platform supported on a first new foundation pile is built below the first pier starting from one end of the bridge; and a second new bearing platform supported on a second new foundation pile is built below the second pier close to the first pier. Support the first cage on the first newly built platform and adjust the height to meet the requirements, build a first transport bridge between the upper access door of the first cage and the cap beam of the first bridge pier, support the second cage on the second newly built platform and adjust the height to meet the requirements, build a second transport bridge between the upper access door of the second cage and the cap beam of the second bridge pier; The personnel, the first jack, the second jack and the cushion block are respectively lifted after entering the loading platform from the lower entrance door of the first hoist cage, and then transported from the upper entrance door and the first transport bridge to the cap beam of the first pier; the personnel, the first jack, the second jack and the cushion block are respectively lifted after entering the loading platform from the lower entrance door of the second hoist cage, and then transported from the upper entrance door and the second transport bridge to the cap beam of the second pier. The first jack is first used to support the cap beam of the first pier and the cap beam of the second pier to lift the two ends of the first bridge deck segment to the set height, and the cushion blocks are supported at both ends of the first bridge deck segment, and then the first jack is removed, and then the second jack is used to support the two ends of the first bridge deck segment. The two ends are lifted to the set height; the first hoist cage and the second hoist cage are raised and supported at both ends of the first bridge deck segment by the third jack, and then the first pier is raised to support one end of the first bridge deck segment, and the hoist cage on the first newly built pedestal is removed; the second bridge deck segment is lifted to the set height by the same method, and the second pier is raised to support the other end of the first bridge deck segment and one end of the second bridge deck segment, and the second hoist cage and the hoist cage supporting one end of the second bridge deck segment are removed; and so on, all bridge deck segments are lifted and all bridge piers are raised to the set height.

2. The bridge deck lifting device for connecting piers in confined spaces according to claim 1 is characterized in that: The jacking unit also includes four jacking oil cylinders distributed on the four corners of the cage, the lower end of the vertical pipe section is provided with a plurality of lower connecting ears with lower bolt holes, and the upper end is provided with a plurality of upper connecting ears with upper bolt holes, and the adjacent vertical pipe sections are fixed together with the pipe section connecting nuts after the pipe section connecting bolts pass through the upper bolt holes and the lower bolt holes. The four corners of the vertical pipe section are provided with oil cylinder connecting ears, and the lower inlet and outlet doors are provided on the vertical pipe section located at the bottom. When in use, the vertical pipe section located at the bottom is fixed together with the newly built foundation; the method for raising the cage is: the pipe section connecting nuts and pipe section connecting bolts connecting the second vertical pipe section from the bottom to the top are removed, the lower ends of the four jacking oil cylinders are fixed on the newly built foundation, and the upper ends are fixed together with the oil cylinder connecting ears on the second vertical pipe section to perform the jacking connection step; the process of the jacking connection step is: the jacking oil cylinder jacks and all the vertical pipe sections except the first section of the vertical pipe are lifted. The part is jacked up until the gap between the second vertical pipe section and the first vertical pipe section is greater than the length of one vertical pipe section, and an added vertical pipe section is supported on the first vertical pipe section. The jacking cylinder is lowered so that the second vertical pipe section is supported on the added vertical pipe section, and then the added vertical pipe is fixed to the second vertical pipe section. At this time, the added vertical pipe section becomes the second vertical pipe section, and the original second vertical pipe section becomes the third vertical pipe section; if only one vertical pipe section needs to be added, the added vertical pipe section is fixed to the first vertical pipe section; if more than two vertical pipe sections need to be added, the cylinder replacement step is performed, and then the jacking and connection step is performed, and the cylinder replacement step and the jacking and connection step are repeated until all vertical pipe sections that need to be connected are connected, and then the last added vertical pipe section is fixed to the first vertical pipe section; the specific process of the cylinder replacement step is: the jacking cylinder is disengaged from the third vertical pipe section, then retracted and connected to the cylinder connecting ear of the second vertical pipe section.

3. The bridge deck lifting device for connecting piers in confined spaces according to claim 2 is characterized in that: The lower end of the vertical pipe section is fixed on the supporting ring, and the periphery of the supporting ring exceeds the vertical pipe section to form the lower connecting ear and the oil cylinder connecting ear.

4. The bridge deck lifting device for connecting piers in confined spaces according to claim 3 is characterized in that: A vertical through hole is provided on the oil cylinder connecting ear, and a vertical connecting pin is provided on the piston rod of the jacking oil cylinder; the jacking oil cylinder is connected to the vertical pipe section in the following manner: the vertical connecting pin is passed through the vertical through hole, and the piston rod of the jacking oil cylinder is supported below the oil cylinder connecting ear.

5. The bridge deck lifting device for connecting piers in confined spaces according to claim 2, 3 or 4, characterized in that: The heads of the pipe joint connecting bolts are facing upwards.

6. The bridge deck lifting device for connecting piers in confined spaces according to claim 2, 3 or 4, characterized in that: The four sides of the upper end of the cage are connected to the upper end of the same steel cable, and the lower ends of the steel cables are connected to the same tensioning mechanism. The four tensioning mechanisms are distributed on the four sides of the cage.

7. The bridge deck lifting device for connecting piers in confined spaces according to claim 6 is characterized in that: The tensioning mechanism includes a mounting base fixed on the newly built foundation and a hollow jack hinged to the mounting base through a horizontal hinge shaft, and the steel cable is passed through the hollow jack.

8. The bridge deck lifting device for connecting piers in confined spaces according to claim 6 is characterized in that: The steel cable is connected to the upper end of the second vertical pipe section from the top to the bottom, and the upper entrance door is arranged on the vertical pipe section located at the top.

9. The bridge deck lifting device for connecting piers in confined spaces according to claim 2, 3 or 4, characterized in that: The jacking unit also includes a bridge deck inclination detection structure, which includes a horizontal rod extending in the longitudinal direction of the bridge above the bridge deck segment supported by the cage and connected to the cage through a connecting rod, a vertical scale rod passed through the horizontal connecting rod, and a vertical pointer support rod passed through the horizontal connecting rod, the vertical pointer support rod is connected to a pointer indicating the scale on the vertical scale rod, and when the lower ends of the vertical scale rod and the vertical pointer support rod are located on the same plane, the scale value on the vertical scale rod where the pointer is aligned is zero, and the scale value on the vertical scale rod is the inclination angle of the bridge deck segment; when jacking the bridge deck segment, the inclination angle of the bridge deck segment is obtained through the bridge deck inclination detection structure, and the jacking speed at both ends of the bridge deck segment is controlled so that the inclination angle of the bridge deck segment is maintained at a set value and whether the inclination angle of the bridge deck segment when supported by the raised pier is consistent with the angle before jacking.

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