A detachable and adjustable dual-purpose support system for river bridge incremental launching construction and a construction method thereof

Abstract

A detachable and adjustable dual-purpose support system and construction method for river bridge incremental launching construction, the system comprises multiple groups of incremental launching columns and a group of back launching columns arranged in the transverse and longitudinal directions; adjustable supports are installed on the top of the incremental launching columns and the back launching columns, the supports are composed of fixed segments and telescopic segments inserted therein, and the height is accurately adjusted by increasing or decreasing adjusting pads. The supports on the top of the incremental launching columns are used to support the incremental launching distribution beam and the incremental launching beam, forming an incremental launching platform; the supports on the top of the back launching columns are used for the back launching operation of the bridge body after the incremental launching is completed; the columns are connected into a stable space frame through horizontal connecting rods and inclined braces. The invention uses flange-plate-connected standardized pipe segments, realizes the rapid assembly and disassembly and repeated use of the whole system, effectively solves the problems of low construction efficiency, poor adaptability, single function and great influence on river flood discharge of the traditional welding support construction, and is especially suitable for bridge construction in flood season or in a river channel with limited navigation.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a temporary support system and construction method for the jacking method of steel structure bridges in flood season or navigation-restricted waterways. Background Technology

[0002] In bridge construction spanning rivers, canyons, and other obstacles, the incremental launching method is a commonly used advanced construction technique. This method involves assembling bridge segments sequentially in a prefabrication yard at the bridgehead, and then using a hydraulic jacking device to push the entire bridge horizontally forward until it reaches the designed position. For rivers with flood season or navigation restrictions, this method is suitable because the construction window is short, and temporary structures must have minimal impact on river flow and be easily dismantled later.

[0003] In the jacking construction, the temporary support system is a key facility, which mainly undertakes two functions: 1) Jacking support: to provide intermediate support for the bridge body during the jacking process to prevent excessive downward deflection; 2) Back-jacking support: to lift the entire bridge body when the permanent supports need to be installed or the system needs to be converted after the bridge body is jacked into place.

[0004] Currently, the closest existing technology uses welded H-beams or steel pipe lattice columns as temporary supports. This traditional approach has the following significant drawbacks: 1. Non-removable and inefficient: The support columns are integrally welded structures, requiring extensive on-site welding and cutting work for installation and dismantling, resulting in low construction efficiency and significant damage to the original riverbed appearance. 2. Unadjustable elevation and poor adaptability: The top elevation of the support is fixed; if the elevation becomes inconsistent due to foundation settlement or installation errors, adjustment is extremely difficult, time-consuming, and labor-intensive. 3. Limited functionality: Typically, only the jacking function is considered; when used as a back-jacking support, additional reinforcement or a dedicated back-jacking bracket is required, increasing material and construction costs. 4. High flow resistance: The numerous welded connecting rods and stiffening plates create a complex structure, increasing flow resistance in the riverbed and hindering flood control. Therefore, there is an urgent need in this field for a new support system that is quick to install, has an adjustable elevation, combines jacking and back-jacking functions, and has minimal impact on the river environment. Summary of the Invention

[0005] The purpose of this invention is to provide a detachable and adjustable dual-purpose support system for jacking construction of river bridges, which solves the technical problems of traditional support systems, such as non-detachability, low construction efficiency, non-adjustable elevation, only jacking capability, additional reinforcement required for back jacking, high resistance to river flow, and significant environmental impact.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] A detachable and adjustable dual-purpose support system for jacking construction of river bridges includes a jacking column, a jacking column, a spatial connection system, a jacking distribution beam, and a load-bearing jacking beam. The jacking column is provided in multiple sets, which are arranged at intervals along the lateral direction and at intervals along the longitudinal direction. A first support is installed on the top of each jacking column. The first support includes a first fixed section and a first telescopic section disposed on the top of the first fixed section. The first fixed section is tubular and detachably connected to the top of the jacking column, and a jacking bearing assembly is disposed inside the first fixed section. The lower part of the first telescopic section is inserted into the first fixed section, and the height of the first telescopic section relative to the first fixed section is adjusted by a first adjusting pad placed between the jacking bearing assembly and the first telescopic section. There is a set of return columns, which are arranged longitudinally at intervals outside the outermost set of push columns; the return columns are arranged one-to-one with the outermost push columns; a second support is installed on the top of the return column; the second support includes a second fixed section and a second telescopic section disposed on the top of the second fixed section; the second fixed section is tubular and detachably connected to the top of the return column, and a return bearing assembly is disposed inside the second fixed section; the lower part of the second telescopic section is inserted into the second fixed section, and the height of the second telescopic section relative to the second fixed section is adjusted by a second adjusting pad placed between the return bearing assembly and the second telescopic section; The spatial connection system includes horizontal connecting rods and connecting rod diagonal braces; the horizontal connecting rods and connecting rod diagonal braces are connected between adjacent jacking columns, between adjacent return columns, and between the outermost jacking column and return column, and the spatial connection system forms a stable spatial frame with the jacking columns and return columns; There is a set of jacking distribution beams, and each jacking distribution beam is installed on the top of the first support corresponding to the transverse direction; the load-bearing jacking beam is set on top of the set of jacking distribution beams.

[0008] Preferably, the jacking column includes a pre-embedded jacking column section, a standard jacking column section, and a first section connector; the pre-embedded jacking column section is pre-embedded in the riverbed foundation; there is a set of standard jacking column sections, arranged vertically, and the lowest standard jacking column section is connected to the pre-embedded jacking column section; the first section connector includes a first flange and a first connecting bolt, used to connect the standard jacking column section to the pre-embedded jacking column section and adjacent standard jacking column sections.

[0009] Preferably, the backfill column includes a pre-embedded pipe section, a standard pipe section, and a second pipe section connector; the pre-embedded pipe section is embedded in the riverbed foundation; there is a set of standard pipe sections, arranged vertically, and the lowest standard pipe section is connected to the pre-embedded pipe section; the second pipe section connector includes a second flange and a second connecting bolt, used to connect the standard pipe section to the pre-embedded pipe section and adjacent standard pipe sections.

[0010] Preferably, a first connecting base plate is provided at the bottom of the first fixed section, and the first fixed section is connected to the push column through the first connecting base plate; the push bearing assembly includes a first bearing main plate, a first side limiting plate, and a first top sealing plate; the first bearing main plate is vertically arranged in the first fixed section, and the first bearing main plate is arranged along the horizontal cross-sectional axis of the first fixed section; two first side limiting plates are provided on each side of the first bearing main plate, each first side limiting plate is perpendicular to the first bearing main plate, one vertical edge of the first side limiting plate is welded to the first bearing main plate, and the other vertical edge of the first side limiting plate is welded to the first bearing main plate. The inner wall of the first fixed section is connected; a first limiting sidewall plate is provided between two first side limiting plates on the same side of the first bearing main board; the first limiting sidewall plate is arranged parallel and spaced apart from the first bearing main board, and the first limiting sidewall plate, the first bearing main board, and the first side limiting plate portion between the first limiting sidewall plate and the first bearing main board together form a first insertion cavity; the first top sealing plate is provided on the first limiting sidewall plate, the corresponding side wall of the first fixed section, and the first side limiting plate portion between the first limiting sidewall plate and the first fixed section together form the top of the cavity; a first stiffening plate is provided at the bottom of the first top sealing plate.

[0011] Preferably, the first telescopic section includes a first top plate, a first pressure-bearing vertical plate, and a first insert plate; the first pressure-bearing vertical plate is fixedly connected to the bottom of the first top plate along the central axis of the first top plate, and the thickness of the first pressure-bearing vertical plate is adapted to the thickness of the first bearing main plate; there are two first insert plates, which are respectively attached to both sides of the first pressure-bearing vertical plate, and the two first insert plates are correspondingly arranged with the first insertion cavities on both sides of the first bearing main plate; the lower end of the first insert plate extends beyond the lower end of the first pressure-bearing vertical plate; a first reinforcing plate is provided at intervals on the side of each first insert plate facing away from the first pressure-bearing vertical plate; the first reinforcing plate is arranged perpendicular to the first pressure-bearing vertical plate.

[0012] Preferably, a second connecting base plate is provided at the bottom of the second fixed section, and the second fixed section is connected to the top return column through the second connecting base plate; the top return bearing assembly includes a second bearing main plate, a second side limiting plate, and a second top sealing plate; the second bearing main plate is vertically arranged inside the second fixed section, and the second bearing main plate is arranged along the horizontal cross-sectional axis of the second fixed section; two second side limiting plates are provided on each side of the second bearing main plate, each second side limiting plate is perpendicular to the second bearing main plate, one vertical edge of the second side limiting plate is welded to the second bearing main plate, and the other vertical edge of the second side limiting plate is welded to the second bearing main plate. The inner wall of the second fixed section is connected; a second limiting side wall plate is provided between the two second side limiting plates on the same side of the second bearing main board; the second limiting side wall plate is arranged parallel and spaced apart from the second bearing main board, and the second limiting side wall plate, the second bearing main board, and the second side limiting plate portion between the second limiting side wall plate and the second bearing main board together form the second insertion cavity; the second top sealing plate is provided on the second limiting side wall plate, the corresponding side wall of the second fixed section, and the second side limiting plate portion between the second limiting side wall plate and the second fixed section together form the top of the cavity; a second stiffening plate is provided at the bottom of the second top sealing plate.

[0013] Preferably, the second telescopic section includes a second top plate, a second pressure-bearing vertical plate, and a second insert plate; the second pressure-bearing vertical plate is fixedly connected to the bottom of the second top plate along the central axis of the second top plate, and the thickness of the second pressure-bearing vertical plate is adapted to the thickness of the second bearing main plate; there are two second insert plates, which are respectively attached to both sides of the second pressure-bearing vertical plate, and the two second insert plates are correspondingly arranged with the second insertion cavities on both sides of the second bearing main plate; the lower end of the second insert plate extends beyond the lower end of the second pressure-bearing vertical plate; a second reinforcing plate is provided at intervals on the side of each second insert plate facing away from the second pressure-bearing vertical plate; the second reinforcing plate is arranged perpendicular to the second pressure-bearing vertical plate.

[0014] Preferably, the jacking distribution beam is composed of two parallel welded steel sections, the vertical cross-section of which is I-shaped, and the web of the steel section is welded with external stiffening plates and internal stiffening plates on both sides.

[0015] Preferably, the load-bearing jacking beam is composed of two box beams welded side by side; the box beams are internally reinforced with stiffening plates welded at intervals, and the upper and lower flanges of the two box beams are connected as a whole by upper and lower connecting plates, respectively.

[0016] A construction method for a detachable and adjustable dual-purpose support system includes the following steps.

[0017] Step 1: Set the jacking column and the return column at the designed positions.

[0018] Step 2: Install the first support on the top of the jacking column, and adjust the top surface elevation of the first support to the design value by inserting the first adjusting pad.

[0019] Step 3: Install the second support on top of the top support column.

[0020] Step 4, structural stabilization: Install horizontal connecting rods and connecting rod diagonal braces to connect the jacking column and the return column into a stable spatial structure.

[0021] Step 5, Installation of the support platform: Install the jacking distribution beam and the support jacking beam in sequence on the top of the first support.

[0022] Step six: Carry out the jacking construction of bridge segments.

[0023] Step 7: After the jacking is completed, the top surface elevation of the second support is adjusted to the design value by inserting the second adjusting pad, and the bridge body is jacked back using the jacking column and the second support.

[0024] Compared with the prior art, the present invention has the following features and beneficial effects.

[0025] 1. This invention relates to the construction of steel structure bridges using the jacking method on waterways with flood seasons and prohibited navigation. The support system is a dual-purpose support for jacking and jacking, which can serve as both jacking and jacking support, facilitating the installation of the bridge superstructure and protecting the bridge. At the same time, this support system is detachable, which improves construction efficiency. Furthermore, the top elevation of the support column is adjustable, saving elevation adjustment time and ultimately saving costs.

[0026] 2. The system of this invention was designed from the outset to accommodate both dynamic support during the jacking process and static back-jacking requirements during system transitions. Its structural stiffness and strength are designed for the most unfavorable working conditions, eliminating the hassle of building two separate support systems. It boasts high functional integration and a simple, efficient solution. Furthermore, the system aims to achieve rapid installation and dismantling, precise adjustment of support elevation, simultaneous fulfillment of both jacking and back-jacking requirements, and minimize obstruction to river flow. All major components (support columns, connecting rods) are connected using flanges and high-strength bolts, achieving fully modular assembly. After construction, it can be quickly dismantled, and components can be reused in other projects, significantly saving costs and time, and reducing construction waste.

[0027] 3. The innovative support design of this invention, through the plug-in structure of the fixed and telescopic sections and the adjustment pads of different thicknesses, enables convenient and precise adjustment of the support top elevation, effectively compensating for foundation settlement or installation errors. Simultaneously, this system integrates the functions of jacking support and jacking back support into one unit. The jacking column is responsible for support during the jacking process, while the jacking column is responsible for the final system conversion and jacking back. The functions are clearly defined, avoiding the hassle of building additional supports for jacking back operations as required by traditional solutions, thus saving costs and construction time.

[0028] 4. This invention optimizes the structure, minimizing the impact on water flow. The spatial connection system (horizontal connecting rods and diagonal braces) and the standardized tubular columns form a spatial frame that ensures overall stability while simplifying the structure and optimizing the number of rods. Compared with traditional welded lattice columns and their complex connecting rods, it significantly reduces the water-blocking area in the water flow, which is more conducive to river flood control and meets environmental protection requirements.

[0029] 5. The support of the present invention is equipped with load-bearing components, such as a load-bearing main plate, side limiting plate, insert plate, etc., and stiffening structures of distribution beam and jacking beam, which together form an efficient force transmission path, ensuring structural safety and local stability under the two high-load conditions of jacking and jacking.

[0030] In summary, this invention, through its ingenious modular structure and unique elevation adjustment design, successfully solves a series of technical problems of traditional temporary support systems, demonstrating significant practicality, economy, and innovation. Attached Figure Description

[0031] The present invention will now be described in further detail with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the structure of the detachable and adjustable dual-purpose support system of the present invention installed on the pile foundation.

[0033] Figure 2 This is a schematic diagram of the detachable and adjustable dual-purpose support system of the present invention.

[0034] Figure 3 This is a schematic diagram of the pre-embedded pipe section of the top column in this invention.

[0035] Figure 4 This is a schematic diagram of the pre-embedded pipe section of the jacking column in this invention.

[0036] Figure 5 This is a schematic diagram of the standard pipe section of the jacking column in this invention.

[0037] Figure 6 This is a schematic diagram of the structure of the standard pipe section of the top column in this invention.

[0038] Figure 7 This is a schematic diagram of the structure of the first support in this invention.

[0039] Figure 8 This is a schematic diagram of the structure of the second support in this invention.

[0040] Figure 9 This is a schematic diagram of the internal structure of the first support after the first fixed section is cut open in this invention.

[0041] Figure 10This is a schematic diagram of the internal structure of the second support after the second fixed section is cut open in this invention.

[0042] Figure 11 This is a side three-dimensional structural diagram of the jacking distribution beam in this invention.

[0043] Figure 12 This is a frontal three-dimensional structural diagram of the jacking distribution beam in this invention.

[0044] Figure 13 This is a three-dimensional structural diagram of the load-bearing jacking beam in this invention.

[0045] Figure 14 This is a schematic diagram of the internal structure of the load-bearing jacking beam after the box girder is cut open in this invention.

[0046] Figure 15 This is a schematic diagram of the connection structure between the jacking bearing component and the first fixed section in this invention.

[0047] Figure 16 This is a schematic diagram of the connection structure between the top support component and the second fixed section in this invention.

[0048] Figure 17 This is a schematic diagram of the structure of the second telescopic section in this invention.

[0049] Figure 18 This is a schematic diagram of the structure of the first telescopic segment in this invention. Figure 19 This is a schematic diagram of the connection structure of adjacent standard pipe sections of the top column in this invention.

[0050] Figure 20 This is a schematic diagram of the connection structure of the pre-embedded pipe sections of adjacent jacking columns according to the present invention.

[0051] Attached reference numerals: 1 – Backfill column, 1.1 – Backfill column embedded pipe section, 1.2 – Backfill column standard pipe section, 1.3 – Second pipe section connector, 1.3.1 – Second flange, 1.3.2 – Second connecting bolt, 2 – Push column, 2.1 – Push column embedded pipe section, 2.2 – Push column standard pipe section, 2.3 – First pipe section connector, 2.3.1 – First flange, 2.3.2 – First connecting bolt, 3 – Push distribution beam, 3 3.1 - Steel section; 3.2 - External stiffening plate; 3.3 - Internal stiffening plate; 4 - Load-bearing jacking beam; 4.1 - Box girder; 4.2 - Internal stiffening plate; 4.3 - Upper gusset plate; 4.4 - Lower gusset plate; 5 - Horizontal connecting rod; 6 - Connecting rod diagonal brace; 7 - First support; 7.1 - First fixed section; 7.2 - First telescopic section; 7.2.1 - First top plate; 7.2.2 - First bearing vertical plate; 7.2.3 - First insert plate; 7.2 7.4 – First reinforcing plate; 7.3 – Pushing load-bearing assembly; 7.3.1 – First load-bearing main plate; 7.3.2 – First side limiting plate; 7.3.3 – First top sealing plate; 7.3.4 – First limiting side wall plate; 7.3.5 – First stiffening plate; 7.4 – First adjusting pad; 7.5 – First connecting base plate; 8 – Second support; 8.1 – Second fixed section; 8.2 – Second telescopic section; 8.2.1 – Second top plate; 8.2 8.2 - Second pressure-bearing vertical plate; 8.2.3 - Second insert plate; 8.2.4 - Second reinforcing plate; 8.3 - Top-supporting assembly; 8.3.1 - Second main bearing plate; 8.3.2 - Second side limiting plate; 8.3.3 - Second top sealing plate; 8.3.4 - Second limiting side wall plate; 8.3.5 - Second stiffening plate; 8.4 - Second adjusting pad; 8.5 - Second connecting base plate; 9 - First insertion cavity; 10 - Second insertion cavity. Detailed Implementation

[0052] like Figure 1-20 As shown, this detachable and adjustable dual-purpose support system for jacking construction of river bridges includes a jacking column 1, a jacking column 2, a spatial connection system, a jacking distribution beam 3, and a load-bearing jacking beam 4. Multiple sets of jacking columns 2 are provided, arranged at intervals along the lateral direction and at intervals along the longitudinal direction. A first support 7 is installed on the top of each jacking column 2. The first support 7 includes a first fixed section 7.1 and a first telescopic section 7.2 disposed on the top of the first fixed section 7.1. The first fixed section 7.1 is tubular and detachably connected to the top of the jacking column 2, and a jacking bearing assembly 7.3 is disposed inside the first fixed section 7.1. The lower part of the first telescopic section 7.2 is inserted into the first fixed section 7.1, and the height of the first telescopic section 7.2 relative to the first fixed section 7.1 is adjusted by a first adjusting pad 7.4 placed between the jacking bearing assembly 7.3 and the first telescopic section 7.2. The jacking bearing assembly 7.3 is used to bear the load during the jacking process and provide support for the jacking operation.

[0053] There is a set of jacking columns 1, which are arranged longitudinally at intervals outside the outermost set of jacking columns 2. Each jacking column 1 corresponds to one of the outermost jacking columns 2. A second support 8 is installed on the top of the jacking column 1. The second support 8 includes a second fixed section 8.1 and a second telescopic section 8.2 located on top of the second fixed section 8.1. The second fixed section 8.1 is tubular and detachably connected to the top of the jacking column 1. A jacking support assembly 8.3 is provided inside the second fixed section 8.1. The lower part of the second telescopic section 8.2 is inserted into the second fixed section 8.1. The height of the second telescopic section 8.2 relative to the second fixed section 8.1 is adjusted by a second adjusting pad 8.4 placed between the jacking support assembly 8.3 and the second telescopic section 8.2. The jacking support assembly 8.3 is used to bear the load during the jacking process and provide support for the jacking operation.

[0054] The spatial connection system includes horizontal connecting rods 5 and connecting rod diagonal braces 6; the horizontal connecting rods 5 and connecting rod diagonal braces 6 are connected between adjacent jacking columns 2, between adjacent return columns 1, and between the outermost jacking column 2 and return column 1, and the spatial connection system forms a stable spatial frame with the jacking columns 2 and return columns 1. There is a set of jacking distribution beams 3, and each jacking distribution beam 3 is installed on the top of the first support 7 corresponding to the transverse direction; the load-bearing jacking beam 4 is set on top of a set of jacking distribution beams 3.

[0055] In this embodiment, the jacking column 2 includes a pre-embedded jacking column section 2.1, a standard jacking column section 2.2, and a first section connector 2.3. The pre-embedded jacking column section 2.1 is pre-embedded in the riverbed foundation. A set of standard jacking column sections 2.2 is arranged vertically, with the lowest standard section 2.2 connected to the pre-embedded jacking column section 2.1. The first section connector 2.3 includes a first flange 2.3.1 and a first connecting bolt 2.3.2, used to connect the standard jacking column section 2.2 to the pre-embedded jacking column section 2.1 and adjacent standard jacking column sections 2.2. A reinforcing plate is provided at the connection between the first connecting bolt 2.3.2 and the standard jacking column section 2.2 or the pre-embedded jacking column section 2.1.

[0056] The top of the pre-embedded pipe section 2.1 of the jacking column and both ends of the standard pipe section 2.2 of the jacking column are respectively provided with first flanges 2.3.1; the first connecting bolts 2.3.2 are inserted into the first flanges 2.3.1 of the pre-embedded pipe section 2.1 and the standard pipe section 2.2 of the jacking column, as well as into the first flanges 2.3.1 of the adjacent standard pipe section 2.2 of the jacking column, thereby realizing the connection between the pre-embedded pipe section 2.1 of the jacking column, the standard pipe section 2.2 of the jacking column, and the adjacent standard pipe section 2.2 of the jacking column.

[0057] In this embodiment, the backfill column 1 includes a backfill column pre-embedded pipe section 1.1, a backfill column standard pipe section 1.2, and a second pipe section connector 1.3; the backfill column pre-embedded pipe section 1.1 is pre-embedded in the riverbed foundation; there is a set of backfill column standard pipe sections 1.2, which are arranged vertically, and the lowest backfill column standard pipe section 1.2 is connected to the backfill column pre-embedded pipe section 1.1; the second pipe section connector 1.3 includes a second flange 1.3.1 and a second connecting bolt 1.3.2, used to connect the backfill column standard pipe section 1.2 to the backfill column pre-embedded pipe section 1.1 and adjacent backfill column standard pipe sections 1.2; a reinforcing plate is provided at the connection between the second flange 1.3.1 and the backfill column standard pipe section 1.2 or the backfill column pre-embedded pipe section 1.1.

[0058] The top of the pre-embedded pipe section 1.1 of the jacking column and both ends of the standard pipe section 1.2 of the jacking column are respectively provided with second flanges 1.3.1; the second connecting bolts 1.3.2 are inserted into the second flanges 1.3.1 of the pre-embedded pipe section 2.1 and the standard pipe section 2.2 of the jacking column, as well as into the second flanges 1.3.1 of the adjacent standard pipe section 2.2 of the jacking column, thereby realizing the connection between the pre-embedded pipe section 2.1 of the jacking column, the standard pipe section 2.2 of the jacking column, and the adjacent standard pipe section 2.2 of the jacking column.

[0059] In this embodiment, a first connecting base plate 7.5 is provided at the bottom of the first fixed section 7.1, and the first fixed section 7.1 is connected to the push column 2 through the first connecting base plate 7.5; the push bearing assembly 7.3 includes a first bearing main plate 7.3.1, a first side limiting plate 7.3.2, and a first top sealing plate 7.3.3; the first bearing main plate 7.3.1 is vertically arranged inside the first fixed section 7.1, and the first bearing main plate 7.3.1 is arranged along the horizontal cross-sectional axis of the first fixed section 7.1; the two vertical sides of the first bearing main plate 7.3.1 are welded to the inner sidewall of the first fixed section 7.1 respectively; two first side limiting plates 7.3.2 are provided on each side of the first bearing main plate 7.3.1, each first side limiting plate 7.3.2 is perpendicular to the first bearing main plate 7.3.1, and one vertical side of the first side limiting plate 7.3.2 is welded to the first bearing main plate 7.3.1. The other vertical side of 2 is connected to the inner wall of the first fixed section 7.1; a first limiting side wall plate 7.3.4 is provided between the two first side limiting plates 7.3.2 on the same side as the first bearing main board 7.3.1; the first limiting side wall plate 7.3.4 is arranged parallel to and spaced apart from the first bearing main board 7.3.1, and the first limiting side wall plate 7.3.4, the first bearing main board 7.3.1, and the first side limiting plate 7.3.2 between the first limiting side wall plate 7.3.4 and the first bearing main board 7.3.1 together form the first insertion cavity 9; the first top sealing plate 7.3.3 is provided on the first limiting side wall plate 7.3.4, the corresponding side wall of the first fixed section 7.1, and the first side limiting plate 7.3.2 between the first limiting side wall plate 7.3.4 and the first fixed section 7.1 together form the top of the cavity, and together constitute a closed reinforcing structure; a first stiffening plate 7.3.5 is provided at the bottom of the first top sealing plate 7.3.3.

[0060] In this embodiment, the first telescopic section 7.2 includes a first top plate 7.2.1, a first pressure-bearing vertical plate 7.2.2, and a first insert plate 7.2.3. The first pressure-bearing vertical plate 7.2.2 is fixedly connected to the bottom of the first top plate 7.2.1 along the central axis of the first top plate 7.2.1, and the thickness of the first pressure-bearing vertical plate 7.2.2 is adapted to the thickness of the first bearing main plate 7.3.1. There are two first insert plates 7.2.3, which are respectively attached to both sides of the first pressure-bearing vertical plate 7.2.2, and the two first insert plates 7.2.3 are correspondingly arranged with the first insertion cavities 9 on both sides of the first bearing main plate 7.3.1. The first insertion cavity 9 is a limiting space for accommodating and guiding the first insert plate 7.2.3. The lower end of the first insert plate 7.2.3 extends beyond the lower end of the first pressure-bearing vertical plate 7.2.2; a first reinforcing plate 7.2.4 is provided at intervals on the side of each first insert plate 7.2.3 facing away from the first pressure-bearing vertical plate 7.2.2; the first reinforcing plate 7.2.4 is arranged perpendicular to the first pressure-bearing vertical plate 7.2.2. When the first telescopic section 7.2 is inserted into the first fixed section 7.1, the first pressure-bearing vertical plate 7.2.2 is supported on the first bearing main plate 7.3.1, and the first adjusting pad 7.4 is placed between the first pressure-bearing vertical plate 7.2.2 and the first bearing main plate 7.3.1.

[0061] In this embodiment, a second connecting base plate 8.5 is provided at the bottom of the second fixed section 8.1, and the second fixed section 8.1 is connected to the top return column 1 through the second connecting base plate 8.5; the top return bearing assembly 8.3 includes a second bearing main plate 8.3.1, a second side limiting plate 8.3.2, and a second top sealing plate 8.3.3; the second bearing main plate 8.3.1 is vertically arranged inside the second fixed section 8.1, and the second bearing main plate 8.3.1 is arranged along the horizontal cross-sectional axis of the second fixed section 8.1; the two vertical sides of the second bearing main plate 8.3.1 are welded to the inner sidewall of the second fixed section 8.1 respectively; two second side limiting plates 8.3.2 are provided on each side of the second bearing main plate 8.3.1, each second side limiting plate 8.3.2 is perpendicular to the second bearing main plate 8.3.1, and one vertical side of the second side limiting plate 8.3.2 is welded to the second bearing main plate 8.3.1. The other vertical side of 2 is connected to the inner wall of the second fixed section 8.1; a second limiting side wall plate 8.3.4 is provided between the two second side limiting plates 8.3.2 on the same side as the second bearing main plate 8.3.1; the second limiting side wall plate 8.3.4 and the second bearing main plate 8.3.1 are arranged parallel and spaced apart, and the second limiting side wall plate 8.3.4, the second bearing main plate 8.3.1, and the second side limiting plate 8.3.2 between the second limiting side wall plate 8.3.4 and the second bearing main plate 8.3.1 together form the second insertion cavity 10; the second top sealing plate 8.3.3 is provided on the second limiting side wall plate 8.3.4, the corresponding side wall of the second fixed section 8.1, and the second side limiting plate 8.3.2 between the second limiting side wall plate 8.3.4 and the second fixed section 8.1 together form the top of the cavity, and together constitute a closed reinforcing structure; a second stiffening plate 8.3.5 is provided at the bottom of the second top sealing plate 8.3.3.

[0062] In this embodiment, the second telescopic section 8.2 includes a second top plate 8.2.1, a second pressure-bearing vertical plate 8.2.2, and a second insert plate 8.2.3. The second pressure-bearing vertical plate 8.2.2 is fixedly connected to the bottom of the second top plate 8.2.1 along the central axis of the second top plate 8.2.1, and the thickness of the second pressure-bearing vertical plate 8.2.2 is adapted to the thickness of the second bearing main plate 8.3.1. There are two second insert plates 8.2.3, which are respectively attached to both sides of the second pressure-bearing vertical plate 8.2.2, and the two second insert plates 8.2.3 are correspondingly arranged with the second insertion cavities 10 on both sides of the second bearing main plate 8.3.1. The second insertion cavity 10 is a limiting space for accommodating and guiding the second insert plate 8.2.3. The lower end of the second insert plate 8.2.3 extends beyond the lower end of the second pressure-bearing vertical plate 8.2.2; a second reinforcing plate 8.2.4 is spaced apart on the side of each second insert plate 8.2.3 facing away from the second pressure-bearing vertical plate 8.2.2; the second reinforcing plate 8.2.4 is perpendicular to the second pressure-bearing vertical plate 8.2.2. When the second telescopic section 8.2 is inserted into the second fixed section 8.1, the second pressure-bearing vertical plate 8.2.2 is supported on the second bearing main plate 8.3.1, and the second adjusting pad 8.4 is placed between the second pressure-bearing vertical plate 8.2.2 and the second bearing main plate 8.3.1.

[0063] In this embodiment, the jacking distribution beam 3 is composed of two parallel welded steel sections 3.1. The vertical cross-section of the steel section 3.1 is I-shaped, and the web of the steel section 3.1 is welded with an outer stiffening plate 3.2 and an inner stiffening plate 3.3 on both sides.

[0064] In this embodiment, the load-bearing jacking beam 4 is composed of two box beams 4.1 welded side by side; the box beams 4.1 are equipped with internal stiffening plates 4.2 welded at intervals, and the upper and lower flanges of the two box beams 4.1 are connected as a whole by upper connecting plate 4.3 and lower connecting plate 4.4 respectively.

[0065] In this embodiment, the first adjusting pad 7.4 and the second adjusting pad 8.4 are both made of steel plates of different thicknesses. By combining steel plates of different thicknesses, stepless and precise adjustment of the top elevation of the first telescopic section 7.2 and the second telescopic section 8.2 can be achieved.

[0066] In this embodiment, the planar arrangement of the pre-embedded pipe section 1.1 of the back-top column and the pre-embedded pipe section 2.1 of the jacking column in the foundation corresponds to the distribution of the final load on the support system.

[0067] In this embodiment, the connection between the horizontal connecting rod 5 and the connecting rod diagonal brace 6 and the jacking column 2 and the return column 1 is a bolt connection or a quick-disassembly assembly connection.

[0068] In this embodiment, the jacking system is used to bear the load during the jacking process, and the jacking back system provides support for the jacking back operation.

[0069] The construction method of this detachable and adjustable dual-purpose support system includes the following steps.

[0070] Step 1: Set the jacking column 2 and the return column 1 at the designed positions.

[0071] Step 2: Install the first support 7 on the top of the jacking column 2, and adjust the top surface elevation of the first support 7 to the design value by inserting the first adjusting pad 7.4.

[0072] Step 3: Install the second support 8 on the top of the top support column 1.

[0073] Step 4, structural stabilization: Install horizontal connecting rod 5 and connecting rod diagonal brace 6 to connect the jacking column 2 and the return column 1 into a stable spatial structure.

[0074] Step 5, installation of the bearing platform: Install the jacking distribution beam 3 and the bearing jacking beam 4 in sequence on the top of the first support 7.

[0075] Step six: Carry out the jacking construction of bridge segments.

[0076] Step 7: After the jacking is completed, the top surface elevation of the second support 8 is adjusted to the design value by inserting the second adjusting pad 8.4, and the bridge body is jacked back using the jacking column 1 and the second support 8.

[0077] Step 8, Dismantling and Recycling: After the completion of all construction work, the bearing platform, connecting structure, support column adjustment section and modular support column are dismantled in reverse order. All components are maintained and then recycled.

[0078] In this embodiment, in step two, the first support 7 is first lifted, and a first adjusting pad 7.4 of designed thickness is inserted between the first pressure-bearing vertical plate 7.2.2 and the first bearing main plate 7.3.1. Then, the first support 7 is lowered to compact the first adjusting pad 7.4, thereby completing the elevation adjustment.

[0079] In this embodiment, in step seven, the second support 8 is first raised, and a second adjusting pad 8.4 of designed thickness is inserted between the second pressure-bearing vertical plate 8.2.2 and the second bearing main plate 8.3.1. Then, the second support 8 is lowered to compact the second adjusting pad 8.4, thereby completing the elevation adjustment.

[0080] In this embodiment, during the pile foundation construction in step one, pre-embedded sections 1.1 and 2.1 of the jacking column are installed. Then, standard sections 2.2 of the jacking column and 3.2 of the return column are installed section by section using bolts until the required height is reached. The standard sections are steel pipes with flanges and stiffening plates welded to both ends. A first support 7 or a second support 8 is installed on top of the standard sections. Finally, the jacking distribution beam 3 and the load-bearing jacking beam 4 are installed on top of the first support 7.

[0081] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments are also possible. The purpose of the above embodiments is to illustrate the present invention, rather than to limit the scope of protection of the present invention. All applications derived from simple variations of the present invention fall within the scope of protection of the present invention.

Claims

1. A detachable and adjustable dual-purpose support system for jacking construction of river bridges, characterized in that: It includes a back-top column (1), a jacking column (2), a spatial connection system, a jacking distribution beam (3), and a load-bearing jacking beam (4); The jacking column (2) is provided in multiple sets, with the multiple sets of jacking columns (2) arranged at intervals along the lateral direction and each set of jacking columns (2) arranged at intervals along the longitudinal direction; a first support (7) is installed on the top of each jacking column (2); the first support (7) includes a first fixed section (7.1) and a first telescopic section (7.2) provided on the top of the first fixed section (7.1); the first fixed section (7.1) is tubular and detachably connected to the top of the jacking column (2), and a jacking bearing assembly (7.3) is provided inside the first fixed section (7.1); the lower part of the first telescopic section (7.2) is inserted into the first fixed section (7.1), and the height of the first telescopic section (7.2) relative to the first fixed section (7.1) is adjusted by a first adjusting pad (7.4) placed between the jacking bearing assembly (7.3) and the first telescopic section (7.2); There is a set of return columns (1), and the set of return columns (1) is arranged longitudinally at intervals outside the outermost set of push columns (2); the return columns (1) and the outermost push columns (2) are arranged one-to-one; a second support (8) is installed on the top of the return column (1); the second support (8) includes a second fixed section (8.1) and a second telescopic section (8.2) set on the top of the second fixed section (8.1); the second fixed section (8.1) is tubular and detachably connected to the top of the return column (1), and a return bearing assembly (8.3) is provided inside the second fixed section (8.1); the lower part of the second telescopic section (8.2) is inserted into the second fixed section (8.1), and the height of the second telescopic section (8.2) relative to the second fixed section (8.1) is adjusted by a second adjusting pad (8.4) placed between the return bearing assembly (8.3) and the second telescopic section (8.2); The spatial connection system includes horizontal connecting rods (5) and connecting rod braces (6); the horizontal connecting rods (5) and connecting rod braces (6) are connected between adjacent jacking columns (2), between adjacent return columns (1), and between the outermost jacking column (2) and return column (1). The spatial connection system forms a stable spatial frame with the jacking column (2) and the return column (1). There is a set of jacking distribution beams (3), and each jacking distribution beam (3) is installed on the top of the first support (7) corresponding to the transverse direction; the bearing jacking beam (4) is set on the top of a set of jacking distribution beams (3).

2. The detachable and adjustable dual-purpose support system for jacking construction of river bridges according to claim 1, characterized in that: The jacking column (2) includes a pre-embedded jacking column pipe section (2.1), a standard jacking column pipe section (2.2), and a first pipe section connector (2.3); the pre-embedded jacking column pipe section (2.1) is pre-embedded in the riverbed foundation; there is a set of standard jacking column pipe sections (2.2) arranged vertically, and the lowest standard jacking column pipe section (2.2) is connected to the pre-embedded jacking column pipe section (2.1); the first pipe section connector (2.3) includes a first flange (2.3.1) and a first connecting bolt (2.3.2) for connecting the standard jacking column pipe section (2.2) to the pre-embedded jacking column pipe section (2.1) and the adjacent standard jacking column pipe section (2.2).

3. The detachable and adjustable dual-purpose support system for jacking construction of river bridges according to claim 1, characterized in that: The backfill column (1) includes a backfill column pre-embedded pipe section (1.1), a backfill column standard pipe section (1.2), and a second pipe section connector (1.3); the backfill column pre-embedded pipe section (1.1) is pre-embedded in the riverbed foundation; there is a set of backfill column standard pipe sections (1.2) arranged vertically, and the lowest backfill column standard pipe section (1.2) is connected to the backfill column pre-embedded pipe section (1.1); the second pipe section connector (1.3) includes a second flange (1.3.1) and a second connecting bolt (1.3.2) for connecting the backfill column standard pipe section (1.2) to the backfill column pre-embedded pipe section (1.1) and the adjacent backfill column standard pipe section (1.2).

4. The detachable and adjustable dual-purpose support system for jacking construction of river bridges according to claim 1, characterized in that: The bottom of the first fixed section (7.1) is provided with a first connecting base plate (7.5), and the first fixed section (7.1) is connected to the push column (2) through the first connecting base plate (7.5); the push bearing assembly (7.3) includes a first bearing main plate (7.3.1), a first side limiting plate (7.3.2), and a first top sealing plate (7.3.3); the first bearing main plate (7.3.1) is vertically arranged in the first fixed section (7.1), and the first bearing main plate (7.3.1) is arranged along the horizontal cross-sectional axis of the first fixed section (7.1); the first side limiting plate (7.3.2) is located on the first bearing main plate (7.3.1). Two first side limiting plates (7.3.2) are provided on each side of the first bearing main plate (7.3.1). Each first side limiting plate (7.3.2) is perpendicular to the first bearing main plate (7.3.1). One vertical edge of the first side limiting plate (7.3.2) is welded to the first bearing main plate (7.3.1), and the other vertical edge of the first side limiting plate (7.3.2) is connected to the inner wall of the first fixed section (7.1). A first limiting side wall plate (7.3.4) is provided between the two first side limiting plates (7.3.2) on the same side of the first bearing main plate (7.3.1). The first limiting side wall plate (7.3.4) is parallel and spaced apart from the first bearing main plate (7.3.1). The first insertion cavity (9) is formed by the plate (7.3.4), the first bearing main plate (7.3.1), and the first side limiting plate (7.3.2) between the first limiting side wall plate (7.3.4) and the first bearing main plate (7.3.1); the first top sealing plate (7.3.3) is set on the first limiting side wall plate (7.3.4), the corresponding side wall of the first fixing section (7.1), and the first side limiting plate (7.3.2) between the first limiting side wall plate (7.3.4) and the first fixing section (7.1); the top of the cavity is formed by the first top sealing plate (7.3.3); a first stiffening plate (7.3.5) is provided at the bottom of the first top sealing plate (7.3.3).

5. The detachable and adjustable dual-purpose support system for jacking construction of river bridges according to claim 4, characterized in that: The first telescopic section (7.2) includes a first top plate (7.2.1), a first pressure-bearing vertical plate (7.2.2), and a first insert plate (7.2.3); the first pressure-bearing vertical plate (7.2.2) is fixedly connected to the bottom of the first top plate (7.2.1) along the central axis of the first top plate (7.2.1), and the thickness of the first pressure-bearing vertical plate (7.2.2) is adapted to the thickness of the first bearing main plate (7.2.1); there are two first insert plates (7.2.3), which are respectively attached to the first pressure-bearing vertical plate (7.2.1). 2.2) on both sides, and the two first insert plates (7.2.3) are correspondingly arranged with the first insertion cavities (9) on both sides of the first bearing main plate (7.3.1); the lower end of the first insert plate (7.2.3) extends beyond the lower end of the first pressure-bearing vertical plate (7.2.2); a first reinforcing plate (7.2.4) is provided at intervals on the side of each first insert plate (7.2.3) away from the first pressure-bearing vertical plate (7.2.2); the first reinforcing plate (7.2.4) is arranged perpendicular to the first pressure-bearing vertical plate (7.2.2).

6. The detachable and adjustable dual-purpose support system for jacking construction of river bridges according to claim 1, characterized in that: The bottom of the second fixed section (8.1) is provided with a second connecting base plate (8.5), and the second fixed section (8.1) is connected to the top return column (1) through the second connecting base plate (8.5); the top return bearing assembly (8.3) includes a second bearing main plate (8.3.1), a second side limiting plate (8.3.2), and a second top sealing plate (8.3.3); the second bearing main plate (8.3.1) is vertically arranged in the second fixed section (8.1), and the second bearing main plate (8.3.1) is arranged along the horizontal cross-sectional axis of the second fixed section (8.1); the second side limiting plate (8.3.2) is located on the second bearing main plate (8.3.1). Two plates are provided on each side of 8.3.1, and each second side limiting plate (8.3.2) is perpendicular to the second bearing main plate ( 8.3.1) is set such that one vertical edge of the second side limiting plate (8.3.2) is connected to the second bearing main plate ( 8.3.1) Welded connection, the other vertical side of the second side limiting plate (8.3.2) is connected to the inner wall of the second fixed section (8.1); the second bearing main plate ( 8.3.1) A second limiting sidewall plate (8.3.4) is provided between the two second side limiting plates (8.3.2) on the same side; the second limiting sidewall plate (8.3.4) and the second bearing main plate (8.3.1) are arranged parallel and spaced apart, and the second limiting sidewall plate (8.3.4), the second bearing main plate (8.3.1), and the second limiting sidewall plate (8.3.4) and the second bearing main plate (8.3.1) are arranged in parallel and spaced apart. The second side limiting plate (8.3.2) between 8.3.1) and the second top sealing plate (8.3.3) is provided on the second limiting side wall plate (8.3.4), the corresponding side wall of the second fixing section (8.1), and the second side limiting plate (8.3.2) between the second limiting side wall plate (8.3.4) and the second fixing section (8.1) to form the top of the cavity; a second stiffening plate (8.3.5) is provided at the bottom of the second top sealing plate (8.3.3).

7. The detachable and adjustable dual-purpose support system for jacking construction of river bridges according to claim 6, characterized in that: The second telescopic section (8.2) includes a second top plate (8.2.1), a second pressure-bearing vertical plate (8.2.2), and a second insert plate (8.2.3); the second pressure-bearing vertical plate (8.2.2) is fixedly connected to the bottom of the second top plate (8.2.1) along the central axis of the second top plate (8.2.1), and the thickness of the second pressure-bearing vertical plate (8.2.2) is adapted to the thickness of the second bearing main plate (8.3.1); there are two second insert plates (8.2.3), which are respectively attached to the second pressure-bearing vertical plate (8.2.1). 2.2) on both sides, and the two second insert plates (8.2.3) are correspondingly arranged with the second insertion cavities (10) on both sides of the second bearing main plate (8.3.1); the lower end of the second insert plate (8.2.3) extends beyond the lower end of the second pressure-bearing vertical plate (8.2.2); a second reinforcing plate (8.2.4) is provided at intervals on the side of each second insert plate (8.2.3) away from the second pressure-bearing vertical plate (8.2.2); the second reinforcing plate (8.2.4) is arranged perpendicular to the second pressure-bearing vertical plate (8.2.2).

8. The detachable and adjustable dual-purpose support system for jacking construction of river bridges according to claim 1, characterized in that: The jacking distribution beam (3) is composed of two parallel welded steel sections (3.1). The vertical cross-section of the steel section (3.1) is I-shaped. The web of the steel section (3.1) is welded with an outer stiffening plate (3.2) and an inner stiffening plate (3.3) on both sides.

9. The detachable and adjustable dual-purpose support system for jacking construction of river bridges according to claim 1, characterized in that: The load-bearing jacking beam (4) is composed of two box beams (4.1) welded side by side; the box beams (4.1) are equipped with internal stiffening plates (4.2) welded at intervals, and the upper and lower flanges of the two box beams (4.1) are connected as a whole by upper gusset plate (4.3) and lower gusset plate (4.4) respectively.

10. A construction method for the detachable and adjustable dual-purpose support system according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Set the jacking column (2) and the return column (1) at the designed positions; Step 2: Install the first support (7) on the top of the jacking column (2), and adjust the top surface elevation of the first support (7) to the design value by inserting the first adjusting pad (7.4); Step 3: Install the second support (8) on the top of the top support column (1); Step 4, structural stabilization: Install horizontal connecting rods (5) and connecting rod braces (6) to connect the jacking column (2) and the return column (1) into a stable spatial structure; Step 5, installation of the bearing platform: Install the jacking distribution beam (3) and the bearing jacking beam (4) in sequence on the top of the first support (7); Step six: Carry out the jacking construction of bridge segments; Step 7: After the jacking is completed, the top surface elevation of the second support (8) is adjusted to the design value by inserting the second adjusting pad (8.4), and the bridge body is jacked back using the jacking column (1) and the second support (8).

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