Large-span curved steel beam continuous pushing method and device

Abstract

This invention discloses a method and apparatus for continuous jacking of a long-span curved steel beam. The method includes: S100, setting up temporary jacking supports, temporary correction supports, temporary support supports, and main beam splicing supports; S200, installing permanent supports, a jacking drive assembly, a guide and correction assembly, and a rolling assembly; S300, dividing the segment into multiple precast sections, setting a front guide beam at the front end and a rear guide beam at the rear end, and fixing them to the jacking drive assembly; S400, the jacking drive assembly pushes the rear guide beam to connect the precast sections. Next; S500, install the jacking drive assembly on the leading beam and pull the segment to the next permanent pier; S600, use the guide correction assembly to correct the axis position of the main beam; S700, repeat steps S400-S600; S800, install the hinge support on the foremost permanent pier, rotate the main beam so that it rests on the permanent supports of other permanent piers; S900, remove the hinge support on the foremost permanent pier, install the permanent support and fix it to the foremost end of the main beam. This improves the efficiency and quality of the jacking operation.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and more specifically, relates to a method and apparatus for continuous jacking of long-span curved steel beams. Background Technology

[0002] With the rapid development of my country's national economy, the construction scale of railway, highway networks, and urban roads is constantly expanding. Except for some highway intersections with low traffic volume that can be handled at grade, most other intersections must be grade-separated. There are two ways to cross existing lines using grade-separated interchanges: underpasses and overpasses. Bridges crossing existing lines can be simply called overpasses. There are two main construction methods for overpasses: rotation and jacking. Existing bridge jacking construction methods mainly include three types: dragging jacking, walking jacking, and rail-clamping jacking. These three jacking methods do not significantly increase the jacking speed, and in actual use, they seriously affect the construction period, increase construction costs, and in severe cases, even affect track safety.

[0003] Chinese Patent Publication No. CN113718653A discloses a method for jacking a curved beam, comprising: pre-constructing two first piers with different orientations, forming a Y-shape; constructing a first traveling platform and a second traveling platform; the first and second traveling platforms are respectively located on both sides of a first pier, spliced ​​together to form a jacking and traveling platform; deploying multiple self-propelled jacking devices; constructing the curved beam, then driving the multiple self-propelled jacking devices to move along the jacking and traveling platform, jacking the curved beam above the two first piers; unloading the curved beam from the multiple self-propelled jacking devices and supporting it on the two first piers respectively. By using multiple self-propelled jacking devices, in conjunction with a cushion layer and a temporary support layer, the technical effects of jacking, pushing, and unloading the curved beam can be achieved, avoiding the obstruction of piers with inconsistent orientations below the curved beam, and is applicable to the jacking construction of different types of curved beams.

[0004] However, the Chinese patent with publication number CN113718653A has a problem with misalignment during the jacking process. Furthermore, due to the curvature of the curved beam itself, its movement is restricted during jacking, affecting operational efficiency. Therefore, a continuous jacking method and device for large-span curved steel beams is needed to ensure the optimal path for the main beam's jacking and installation, thereby improving the efficiency and quality of the jacking process. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a method and apparatus for continuous jacking of large-span curved steel beams. By modeling and working backwards, the optimal jacking routes for different segments and prefabricated sections are derived. Then, the travel path of the jacking drive components, the adjustment of support height changes, and the assembly position and angle of the prefabricated beams are determined, ensuring the optimal path for the jacking installation of the main beam is achieved, thus improving the efficiency and quality of the jacking process. By dividing the main beam into different segments, and then further dividing each segment into multiple prefabricated sections, multiple segments can be assembled at the same construction site, saving construction space and reducing construction steps. Furthermore, by installing the front-end segments before the rear-end segments are installed, the overall curvature of the main beam is avoided, preventing collisions and construction difficulties.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a method for continuous jacking of a long-span curved steel beam is provided, comprising the following steps:

[0007] S100, temporary jacking supports and temporary correction supports are set on both sides of the permanent piers, and temporary support supports and main beam splicing supports are set between the transverse permanent piers.

[0008] S200: Install permanent supports on the top of the permanent pier, set up jacking drive components on the jacking temporary support, set up guide correction components on the correction temporary support, and set up rolling components on the support temporary support.

[0009] S300. Each segment of the main beam is further divided into multiple prefabricated segments for prefabrication. A front guide beam is set at the front end of the foremost prefabricated segment and a rear guide beam is set at the rear end of the last prefabricated segment, and these are fixed to the jacking drive assembly.

[0010] S400, on the main beam splicing bracket, the jacking drive assembly pushes the rear guide beam to connect the last precast segment with the front precast segment and weld them together. The jacking drive assembly then pulls the rear guide beam back to the last end, places a new precast segment to make it the new last precast segment, and repeats the jacking to complete the welding of all precast segments of the current segment.

[0011] S500: After removing the jacking drive assembly from the rear guide beam, install it at the front end of the front guide beam. The jacking drive assembly pulls the front guide beam to move the pre-assembled segments of the main beam forward, so that the front guide beam reaches the next permanent pier. At this time, the main beam splicing support is freed up.

[0012] Before and after steps S600 and S500, the guide correction component is used to correct the axial position of the main beam, so that it is always kept within a reasonable error range during the installation process. At the same time, the height of the adjustment support is adjusted so that the forward direction of the main beam matches its curvature.

[0013] S700: Remove the jacking drive assembly and the rear guide beam, and install them at the rear end of the next precast segment. Repeat steps S400-S600 until all segments of the main beam are jacked and installed.

[0014] S800. Install a hinge support on the foremost permanent pier to connect the foremost end of the main beam with the hinge support. Using the hinge support as a fulcrum, rotate the main beam so that it rests on the permanent supports on other permanent piers and is fixed.

[0015] S900, Remove the hinge bearing on the foremost permanent pier, install a permanent bearing on the permanent pier and fix it to the foremost end of the main beam.

[0016] Furthermore, in step S400, since the lengths and curvatures of different segments of the main beam are different, it is necessary to calculate the overall angles, heights, and positions of different segments. The specific steps are as follows:

[0017] S410. Based on the design parameters, perform three-dimensional modeling of the terrain, permanent piers and the main beam after completion to obtain a scaled three-dimensional model of the completed bridge.

[0018] S420. In the completed 3D model of the bridge at the same scale, the main beam is controlled to be above the supporting components. The main beam is moved to the rear end. By working backward, the optimal advancement route for different segments is simulated.

[0019] S430. Cut out the optimal advancement path of each segment on the main beam splicing support, obtain the posture of each segment on the main beam splicing support, and then use the position of the current precast segment and its rear precast segment to simulate and determine the optimal advancement path of each precast segment.

[0020] S440. Based on the optimal advancement route of the precast segments on each segment, adjust the shape of the main beam splicing bracket to fit the angle and positional relationship of the precast segments on their optimal advancement route, and then advance them according to the optimal advancement route of the precast segments to connect them into segments.

[0021] Further, in step S420, during the reverse calculation process, the optimal propulsion route selected is the one that generates the least amount of additional motion during the main beam's movement. This route is determined by the main beam's rotation frequency, rotation angle, vertical center of gravity movement frequency, and vertical center of gravity movement distance, specifically by the Additional Motion Index (EMI). The lower the EMI value, the more suitable the corresponding propulsion route is for selection. The EMI is:

[0022]

[0023] in, This refers to the cumulative angular velocity of the main beam during the entire jacking process, i.e., the amplitude of rotation.

[0024] The cumulative angular acceleration of the main beam during the entire jacking process, i.e., the change in rotational rate,

[0025] This refers to the cumulative vertical acceleration of the main beam's center of gravity during the entire jacking process, i.e., the amplitude of the center of gravity's vertical vibration.

[0026] f v The frequency of the main beam's center of gravity movement.

[0027] f h The horizontal displacement frequency of the main beam

[0028] D h The horizontal offset of the center of gravity of the main beam.

[0029] This refers to the cumulative acceleration of the main beam's center of gravity during the entire jacking process, i.e., the acceleration of the center of gravity in space.

[0030] Furthermore, the position vector r of the centroid of the main beam c (t) is:

[0031] r c (t) = [x(t), y(t), z(t)] T ,

[0032] Where x(t), y(t), and z(t) are the front-back, left-right, and vertical coordinates of the center of gravity of the main beam, respectively;

[0033] The angular velocity ω(t) of the main beam rotation is:

[0034]

[0035] Here, R(t) is the attitude matrix of the main beam, which is a rotation matrix with respect to time.

[0036] Further, in step S430, the position and orientation of the prefabricated segment are as follows:

[0037]

[0038] Where T is the translation matrix, representing the change in position.

[0039] R is the rotation matrix, representing the change in attitude.

[0040] (x m y m , z m () represents the coordinates of the centroid of the precast segment m.

[0041] (x′ m y′ m, z′ m ) represents the change in the position coordinates of the center of gravity of the precast segment m.

[0042] Furthermore, the translation matrix t is:

[0043]

[0044] The rotation matrix R is:

[0045] R = R z (γ m )·R y (β m )·R x (α m )

[0046] Among them, R x (α m Let be the rotation matrix about the x-axis.

[0047] R y (β m Let be the rotation matrix about the y-axis.

[0048] R z (γ m ) is the rotation matrix about the z-axis.

[0049] Furthermore, step S500 also includes the following steps:

[0050] S510. Construct a functional relationship between the position of the leading beam and the height of all adjustable supports based on the optimal propulsion route, and set an interlock between the leading beam and the adjustable supports.

[0051] S520. Set up a temporary jacking support along the optimal advancement path of the foremost segment. Remove the jacking drive assembly from the rear guide beam and install it at the front end of the front guide beam. The jacking drive assembly drives the front guide beam to move along the temporary jacking support.

[0052] S530. During the forward movement of the guide beam, the adjusting support determines the height of the main beam at its current support point based on the position of the guide beam, and then adjusts its own height to support the main beam, so that each segment of the main beam always remains in the optimal advancement path.

[0053] Further, in step S520, the position s of the guide beam d (t) is:

[0054]

[0055] Among them, s t (t) represents the position of the temporary support being pushed down directly below the guide beam.

[0056] vd (τ) represents the speed of the pusher drive component;

[0057] The speed v of the push drive component d (τ) is determined by the dynamic equations, specifically:

[0058]

[0059] The total mass of the m-push drive assembly, the front guide beam, the main beam, and the rear guide beam is included.

[0060] For the acceleration of the push-driven component,

[0061] F d The driving force provided for the driving components

[0062] F f This includes resistance, including friction.

[0063] Further, in step S530, the height h of the adjustable support... m (t) is:

[0064]

[0065] Among them, v h (t) represents the speed at which the height of the support is adjusted.

[0066] h m (t-Δt) represents the height of the support at the previous moment.

[0067] According to a second aspect of the present invention, a continuous jacking device for a long-span curved steel beam is provided, comprising support components disposed on both sides of a permanent pier, a jacking drive component disposed on the support components, a guide and correction component disposed on the support components, and an adjusting support.

[0068] The support components include a main beam splicing bracket located at the rear end of the last permanent pier, a jacking temporary bracket located on both sides of the main beam splicing bracket and the permanent pier, a supporting temporary bracket located on both sides of the main beam splicing bracket and the permanent pier, and a correction temporary bracket.

[0069] The jacking drive assembly uses a motor and a reducer to provide power. The output end of the reducer is connected to a gear through a universal coupling. The gear and rack are engaged. The rack is segmented and fixed to the jacking temporary support by an I-beam.

[0070] The guiding and correction assembly is mounted on a temporary correction support and includes a guide roller and a hydraulic cylinder. The guide roller includes a guide wheel, a rubber sleeve, a limiting plate, and a support structure.

[0071] The adjustable support is mounted on a temporary support frame, and a roller is provided on its top. An adjustment assembly is also provided between the roller and the adjustable support. The adjustment assembly includes a height adjustment structure and an angle adjustment structure.

[0072] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0073] 1. The jacking method of the present invention, through modeling and reverse deduction, obtains the optimal jacking route for different segments and the optimal jacking route for precast segments, and then determines the travel route of the jacking drive component, adjusts the height change of the support, and determines the assembly position and angle of the precast beam, so that the jacking installation of the main beam is completed along the optimal path, thereby improving the efficiency and quality of the jacking work.

[0074] 2. The jacking method of the present invention divides the main beam into different segments, and then divides each segment into multiple prefabricated segments, so that multiple segments can be spliced ​​at the same construction site, saving construction space and reducing construction steps. At the same time, when constructing the front segment, the rear segment is not installed, avoiding the entire main beam from colliding due to the overall curvature, which would cause construction difficulties.

[0075] 3. The jacking method of the present invention uses a combination of jacking and dragging to bring the precast section to the design position. For short precast sections, jacking is used to make them better contact with the precast section at the front end for welding and fixing. For long sections, dragging is used to make the force more uniform during the movement and avoid frequent swaying.

[0076] 4. The jacking device of the present invention prevents the gear and rack from moving in the vertical direction and breaking the meshing during the pushing process by using a vertical limiting wheel, and prevents the gear and rack from moving in the horizontal direction and breaking the meshing during the pushing process by using a horizontal guide wheel. The vertical limiting wheel and the horizontal guide wheel are used together to limit the gear and prevent it from disengaging from the rack during the movement, thus affecting the pushing of the main beam. Attached Figure Description

[0077] Figure 1 This is a flowchart illustrating a continuous jacking method for a large-span curved steel beam according to an embodiment of the present invention.

[0078] Figure 2 This is a schematic diagram of the specific process of step S400 of a continuous jacking method for a large-span curved steel beam according to an embodiment of the present invention.

[0079] Figure 3 This is a schematic diagram of the specific process of step S500 in a continuous jacking method for a large-span curved steel beam according to an embodiment of the present invention.

[0080] Figure 4This is a schematic diagram of a continuous jacking device for a large-span curved steel beam according to an embodiment of the present invention;

[0081] Figure 5 This is an embodiment of the present invention. Figure 4 Enlarged structural diagram of section A;

[0082] Figure 6 This is a schematic diagram of the installation structure of the jacking drive assembly of a continuous jacking device for large-span curved steel beams according to an embodiment of the present invention;

[0083] Figure 7 This is a schematic diagram of the installation structure of the guide and correction component of a continuous jacking device for large-span curved steel beams according to an embodiment of the present invention.

[0084] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-permanent pier, 2-main beam, 3-front guide beam, 4-rear guide beam, 5-support assembly, 501-temporary jacking support, 502-temporary correction support, 503-temporary support support, 504-main beam splicing support, 6-jacking drive assembly, 7-guide and correction assembly, 8-adjusting support. Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0086] Example 1

[0087] like Figure 1 As shown, this embodiment of the invention provides a method for continuous jacking of large-span curved steel beams, specifically including the following steps:

[0088] S100, a jacking temporary support 501 and a correction temporary support 502 are set on both sides of the permanent pier 1, and a supporting temporary support 503 and a main beam splicing support 504 are set between the transverse permanent piers 1.

[0089] S200, a permanent support is installed on the top of the permanent pier 1, a jacking drive assembly 6 is set on the jacking temporary support 501, a guide correction assembly 7 is set on the correction temporary support 502, and a rolling assembly is set on the support temporary support 503.

[0090] S300. Each segment of the main beam 2 is further divided into multiple prefabricated segments for prefabrication. A front guide beam 3 is set at the front end of the frontmost prefabricated segment, and a rear guide beam 4 is set at the rear end of the last prefabricated segment, and fixed to the jacking drive assembly 6.

[0091] S400, on the main beam splicing bracket 504, the jacking drive assembly 6 pushes the rear guide beam 4 to connect the last precast segment with the front precast segment and weld them together. The jacking drive assembly 6 then pulls the rear guide beam 4 back to the last end, places a new precast segment to make it the new last precast segment, and repeats the jacking to complete the welding of all precast segments of the current segment.

[0092] S500, after removing the jacking drive assembly 6 from the rear guide beam 4, install it at the front end of the front guide beam 3. The jacking drive assembly 6 pulls the front guide beam 3 to move the spliced ​​segments of the main beam 2 forward, so that the front guide beam 3 reaches the next permanent pier 1. At this time, the main beam splicing bracket 504 is freed up.

[0093] Before and after steps S600 and S500, the guide correction component 7 is used to correct the axial position of the main beam 2, so that it is always kept within a reasonable error range during the installation process. At the same time, the height of the adjustment support 8 is adjusted so that the forward direction of the main beam 2 matches its curvature.

[0094] S700, Remove the jacking drive assembly 6 and the rear guide beam 4, and install them at the rear end of the next precast segment. Repeat steps S400-S600 until all segments of the main beam 2 are jacked and installed.

[0095] S800. Install a hinge support on the foremost permanent pier 1, so that the foremost end of the main beam 2 is connected to the hinge support. Using the hinge support as a fulcrum, rotate the main beam 2 so that it falls onto the permanent supports on other permanent piers 1 and is fixed.

[0096] S900, Remove the hinge support on the foremost permanent pier 1, install a permanent support on the permanent pier 1 and fix it to the foremost end of the main beam 2.

[0097] By dividing the main beam 2 into different segments, and then dividing each segment into multiple prefabricated segments, multiple segments can be spliced ​​at the same construction site, saving construction space and reducing construction steps. At the same time, when constructing the front segment, the rear segment is not installed, avoiding the entire main beam 2 from colliding due to the overall curvature, which would cause construction difficulties.

[0098] The precast sections are moved to their designed positions by a combination of jacking and dragging. For short precast sections, jacking is used to ensure better contact with the preceding precast section for welding and fixing. For long sections, dragging is used to ensure more even stress distribution during movement and to avoid frequent swaying.

[0099] Since the main beam 2 is formed as a beam slab with a certain arc shape, during the jacking process, it is necessary to control the bottom surface of its foremost precast section to always remain above the support component 5. Therefore, during the jacking process of all precast sections, it is necessary to plan the path of each precast section and use the adjusting support 8 to adjust the height of different segments of the main beam 2 to achieve precise control.

[0100] like Figure 2 As shown, in step S400, since the lengths and curvatures of different segments of the main beam 2 are different, it is necessary to calculate the overall angle, height, and position of different segments. The specific steps are as follows:

[0101] S410. Based on the design parameters, the terrain, permanent pier 1 and the main beam 2 after completion are modeled in three dimensions to obtain a scaled three-dimensional model of the completed bridge.

[0102] S420. In the completed scale bridge 3D model, the main beam 2 is positioned above the support component 5. The main beam 2 is moved to the rear end. The optimal advancement route for different segments is simulated by working backward.

[0103] S430. Cut out the optimal advancement path of each segment on the main beam splicing support 504, obtain the attitude of each segment on the main beam splicing support 504, and then use the position of the current precast segment and its rear precast segment to simulate and determine the optimal advancement path of each precast segment.

[0104] S440. Based on the optimal advancement route of the precast segments on each segment, adjust the shape of the main beam splicing bracket 504 to fit the angle and positional relationship of the precast segments on their optimal advancement route, and then advance them according to the optimal advancement route of the precast segments to connect them into segments.

[0105] In step S420, during the reverse calculation process, the final landing point of each segment is on the main beam splicing support 504, and the route recording of that segment ends after the front end face of each segment reaches the main beam splicing support 504.

[0106] During the reverse calculation process, the optimal propulsion route is the one that generates the least amount of additional motion during the movement of the main beam 2. This route is determined by the rotation frequency, rotation angle, vertical center of gravity movement frequency, and vertical center of gravity movement distance of the main beam 2, specifically by the Extra Motion Index (EMI). The lower the EMI value, the more suitable the corresponding propulsion route is for selection. The EMI is:

[0107]

[0108] in, This refers to the cumulative angular velocity of the main beam during the entire jacking process, i.e., the amplitude of rotation.

[0109] The cumulative angular acceleration of the main beam during the entire jacking process, i.e., the change in rotational rate,

[0110] This refers to the cumulative vertical acceleration of the main beam's center of gravity during the entire jacking process, i.e., the amplitude of the center of gravity's vertical vibration.

[0111] f v The frequency of the main beam's center of gravity movement.

[0112] f h The horizontal displacement frequency of the main beam

[0113] D h The horizontal offset of the center of gravity of the main beam.

[0114] This refers to the cumulative acceleration of the main beam's center of gravity during the entire jacking process, i.e., the acceleration of the center of gravity in space.

[0115] The position vector r of the center of gravity of the main beam c (t) is:

[0116] r c (t) = [x(t), y(t), z(t)] T ,

[0117] Where x(t), y(t), and z(t) are the front-back, left-right, and vertical coordinates of the center of gravity of the main beam, respectively.

[0118] The angular velocity ω(t) of the main beam rotation is:

[0119]

[0120] Where R(t) is the attitude matrix of the main beam, which is a rotation matrix with respect to time. In step S430, the position and attitude of the precast segment are:

[0121]

[0122] Where T is the translation matrix, representing the change in position.

[0123] R is the rotation matrix, representing the change in attitude.

[0124] (x m y m , z m () represents the coordinates of the centroid of the precast segment m.

[0125] (x′ m y′ m , z′ m ) represents the change in the position coordinates of the center of gravity of the precast segment m.

[0126] The translation matrix T is:

[0127]

[0128] The rotation matrix R is:

[0129] R = R z (γ m )·R y (β m )·R x (α m ),

[0130] Among them, R x (α m Let be the rotation matrix about the x-axis.

[0131] R y (β m Let be the rotation matrix about the y-axis.

[0132] R z (γ m ) is the rotation matrix about the z-axis.

[0133] The rotation matrix R around the x-axis x (α m )for:

[0134]

[0135] Rotation matrix R around the y-axis y (β m )for:

[0136]

[0137] Rotation matrix R about the z-axis z (γ m )for:

[0138]

[0139] Where, α m ,β m γ m These are the angles of the precast segment m around the x, y, and z axes, respectively.

[0140] like Figure 3 As shown, step S500 also includes the following steps:

[0141] S510. Construct a functional relationship between the position of the leading beam 3 and the height of all adjusting supports 8 according to the optimal propulsion route, and set an interlock between the leading beam 3 and the adjusting supports 8.

[0142] S520. Set up a temporary jacking support 501 along the optimal advancement route of the foremost segment. Remove the jacking drive assembly 6 from the rear guide beam 4 and install it at the front end of the front guide beam 3. The jacking drive assembly 6 drives the front guide beam 3 to move along the temporary jacking support 501.

[0143] S530. During the forward movement of the guide beam 3, the adjusting support 8 determines the height of the main beam 2 at its current support point based on the position of the guide beam 3, and then adjusts its own height to support the main beam 2, so that each segment of the main beam 2 is always kept in the optimal advancement path.

[0144] In step S520, the position s of the guide beam 3 d (t) is:

[0145]

[0146] Among them, s t (t) represents the position of the temporary support being pushed down directly below the guide beam.

[0147] v d (τ) represents the speed of the push drive component.

[0148] The speed v of the push drive component d (τ) is determined by the dynamic equations, specifically:

[0149]

[0150] The total mass of the m-push drive assembly, the front guide beam, the main beam, and the rear guide beam is included.

[0151] For the acceleration of the push-driven component,

[0152] F d The driving force provided for the driving components

[0153] F f This includes resistance, including friction.

[0154] In step S530, the height h of the adjusting support 8 is... m (t) is:

[0155]

[0156] Among them, v h (t) represents the speed at which the height of the support is adjusted.

[0157] h m (t-Δt) represents the height of the support at the previous moment.

[0158] After step S700, it is also necessary to remove the front guide beam 3, the jacking temporary support 501, the correction temporary support 502, and the main beam splicing support 504 to make room for the subsequent beam lowering and fixing.

[0159] Example 2

[0160] like Figure 4 , 5 As shown, this embodiment of the invention provides a continuous jacking device for a long-span curved steel beam, including support components 5 on both sides of a permanent pier 1, a jacking drive component 6 on the support components 5, a guide and correction component 7 on the support components 5, and an adjusting support 8. The drive beam 2 is divided into multiple segments, and each segment of the main beam 2 is fixedly connected by welding. Each segment includes multiple precast sections, and each precast section is also fixedly connected by welding.

[0161] The support assembly 5 includes a main beam splicing bracket 504 located at the rear end of the last permanent pier 1, a jacking temporary bracket 501 located on both sides of the main beam splicing bracket 504 and the permanent pier 1, a supporting temporary bracket 503 located on both sides of the main beam splicing bracket 504 and the permanent pier 1, and a correction temporary bracket 502.

[0162] like Figure 6 As shown, the jacking drive assembly 6 uses a motor and a reducer for power. The output end of the reducer is connected to a gear via a universal coupling. The gear engages with a rack, which is segmented and fixed to the jacking temporary support 501 by an I-beam. The motor is a dual-motor system, one in operation and one on standby. When started, the drive gear moves on the rack, thereby driving the main beam 2 forward on the jacking temporary support 501 via the front guide beam 3 or the rear guide beam 4. The drive gear is surrounded by a housing, with the gear protruding from the bottom of the housing. A set of vertical and horizontal limiting wheels are provided on both sides of the protruding bottom portion of the gear. Each set of vertical limiting wheels includes upper and lower guide wheels with a gap between them, the gap being the same thickness as the I-beam of the rack, just enough to clamp the rack and the I-beam. Each set of horizontal limiting wheels includes horizontally positioned guide wheels, the distance between the two horizontal guide wheels being the same as the width of the I-beam, clamping both sides of the I-beam. The vertical limiting wheel prevents the gear and rack from moving vertically during the propulsion process, thus preventing them from breaking the meshing. The horizontal guide wheel prevents the gear and rack from moving horizontally during the propulsion process, thus preventing them from breaking the meshing. The vertical limiting wheel and the horizontal guide wheel are used together to limit the gear and prevent it from disengaging from the rack during the movement, thus affecting the propulsion of the main beam 2.

[0163] like Figure 7As shown, the guiding and correcting assembly 7 is mounted on the temporary correction support 502. It includes a guide roller and a hydraulic cylinder. The guide roller includes a guide wheel, a rubber sleeve, a limiting plate, and a support structure. The support structure is used to fix the guide roller to the output end of the hydraulic cylinder. The hydraulic cylinder is fixed to the temporary correction support 502. The hydraulic cylinder pushes the guide roller, causing the guide wheel to exert a thrust on the side wall of the main beam 2, thereby adjusting the lateral position of the main beam 2. The rubber sleeve is fitted onto the guide wheel to reduce the force generated by the collision between it and the main beam 2.

[0164] The adjusting support 8 is mounted on the temporary support 503, and a roller is provided on its top. An adjusting assembly is also provided between the roller and the adjusting support 8. The adjusting assembly includes a height adjusting structure and an angle adjusting structure. The height adjusting structure is used to adjust the height of the roller so that it always fits against the bottom of the main beam 2 to provide support. Since the main beam 2 is a curved beam and at least two rollers are used side by side, only one roller may be under load, causing it to overload and be damaged. Therefore, the angle adjusting structure adjusts the height of each roller individually so that the side-by-side rollers form an angle to fit against the bottom surface of the main beam 2, making the force more even, extending the service life of the device, and enhancing the device's performance.

[0165] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for continuous jacking of large-span curved steel beams, characterized in that, Includes the following steps: S100, a jacking temporary support (501) and a correction temporary support (502) are set on both sides of the permanent pier (1), and a supporting temporary support (503) and a main beam splicing support (504) are set between the transverse permanent piers (1). S200, a permanent support is installed on the top of the permanent pier (1), a jacking drive assembly (6) is set on the jacking temporary support (501), a guide correction assembly (7) is set on the correction temporary support (502), and a rolling assembly is set on the support temporary support (503); S300, each segment of the main beam (2) is further divided into multiple prefabricated segments for prefabrication. A front guide beam (3) is set at the front end of the frontmost prefabricated segment and a rear guide beam (4) is set at the rear end of the last prefabricated segment, and it is fixed to the jacking drive assembly (6). S400, on the main beam splicing bracket (504), the jacking drive assembly (6) pushes the rear guide beam (4) to connect the last precast section with the front precast section and weld them together. The jacking drive assembly (6) then pulls the rear guide beam (4) back to the last end and places a new precast section to make it the new last precast section. The jacking is repeated to make all the precast sections of the current segment complete the welding. S500, after removing the jacking drive assembly (6) from the rear guide beam (4), install it at the front end of the front guide beam (3). The jacking drive assembly (6) pulls the front guide beam (3) to move the spliced ​​segments of the main beam (2) forward, so that the front guide beam (3) reaches the next permanent pier (1). At this time, the main beam splicing bracket (504) is freed up. Before and after steps S600 and S500, the guide correction component (7) is used to correct the axial position of the main beam (2) so that it remains within a reasonable error range during installation. At the same time, the height of the adjustment support (8) is adjusted so that the forward direction of the main beam (2) matches its curvature. S700, remove the jacking drive assembly (6) and the rear guide beam (4), and install them at the rear end of the precast section of the next segment. Repeat steps S400-S600 until all segments of the main beam (2) are jacked and installed. S800. Install a hinge support on the foremost permanent pier (1) so that the foremost end of the main beam (2) is connected to the hinge support. Using the hinge support as a fulcrum, rotate the main beam (2) so that it falls onto the permanent supports on other permanent piers (1) and is fixed. S900, Remove the hinge support on the foremost permanent pier (1), install a permanent support on the permanent pier (1) and fix it to the foremost end of the main beam (2).

2. The continuous jacking method for a large-span curved steel beam according to claim 1, characterized in that, In step S400, since the lengths and curvatures of different segments of the main beam (2) are different, it is necessary to calculate the overall angle, height, and position of different segments. The specific steps are as follows: S410. Based on the design parameters, the terrain, permanent piers (1) and the main beam (2) after the formation are modeled in three dimensions to obtain a three-dimensional model of the completed bridge at the same scale. S420. In the completed three-dimensional model of the bridge at the same scale, the main beam (2) is controlled to be above the support component (5). The main beam (2) is moved to the rear end. The optimal advancement route of different segments is simulated by pushing backward. S430. Cut out the optimal advancement path of each segment on the main beam splicing support (504) to obtain the posture of each segment on the main beam splicing support (504). Then use the position of the current precast segment and its rear precast segment to simulate and determine the optimal advancement path of each precast segment. S440. According to the optimal advancement route of the precast segment on each segment, adjust the shape of the main beam splicing bracket (504) so ​​that it fits the angle and position relationship of the precast segment on its optimal advancement route, and then advance it according to the optimal advancement route of the precast segment to connect them into segments.

3. The continuous jacking method for a large-span curved steel beam according to claim 2, characterized in that, In step S420, during the reverse calculation process, the optimal propulsion route selected is the one that generates the least amount of additional motion during the movement of the main beam (2). This route is determined by the rotation frequency, rotation angle, vertical movement frequency of the center of gravity, and vertical movement distance of the center of gravity of the main beam (2), specifically by the Extra Motion Index (EMI). The lower the EMI value, the more suitable the corresponding propulsion route is for selection. The EMI is: in, The cumulative angular velocity of the main beam during the entire jacking process, i.e., the amplitude of rotation. The cumulative angular acceleration of the main beam during the entire jacking process, i.e., the change in rotational rate, This refers to the cumulative vertical acceleration of the main beam's center of gravity during the entire jacking process, i.e., the amplitude of the center of gravity's vertical vibration. f v The frequency of the main beam's center of gravity movement. f h The horizontal displacement frequency of the main beam D h The horizontal offset of the center of gravity of the main beam. This refers to the cumulative acceleration of the main beam's center of gravity during the entire jacking process, i.e., the acceleration of the center of gravity in space.

4. The continuous jacking method for a large-span curved steel beam according to claim 3, characterized in that, The position vector r of the center of gravity of the main beam c (t) is: r c (t)=[x(t),u(t),z(t)] T , Where x(t), y(t), and z(t) are the front-back, left-right, and vertical coordinates of the center of gravity of the main beam, respectively; The angular velocity ω(t) of the main beam rotation is: Here, R(t) is the attitude matrix of the main beam, which is a rotation matrix with respect to time.

5. The continuous jacking method for a large-span curved steel beam according to claim 2, characterized in that, In step S430, the position and orientation of the prefabricated segment are as follows: Where T is the translation matrix, representing the change in position. R is the rotation matrix, representing the change in attitude. (x m y m , z m () represents the coordinates of the centroid of the precast segment m. (x′ m y′ m , z′ m ) represents the change in the position coordinates of the center of gravity of the precast segment m.

6. The continuous jacking method for a large-span curved steel beam according to claim 5, characterized in that, The translation matrix T is: The rotation matrix R is: R=R z (c m )·R y (b m )·R x (a m ), Among them, R x (α m Let be the rotation matrix about the x-axis. R y (β m Let be the rotation matrix about the y-axis. R z (γ m ) is the rotation matrix about the z-axis.

7. A method for continuous jacking of a large-span curved steel beam according to any one of claims 1-6, characterized in that, Step S500 also includes the following steps: S510. Construct a functional relationship between the position of the leading beam (3) and the height of all adjusting supports (8) according to the optimal propulsion route, and set an interlock between the leading beam (3) and the adjusting supports (8); S520. Set up a temporary jacking support (501) along the optimal advancement route of the foremost segment. Remove the jacking drive assembly (6) from the rear guide beam (4) and install it at the front end of the front guide beam (3). The jacking drive assembly (6) drives the front guide beam (3) to move along the temporary jacking support (501). S530. During the forward movement of the guide beam (3), the adjusting support (8) determines the height of the main beam (2) at its current support position based on the position of the guide beam (3), and then adjusts its own height to support the main beam (2), so that each segment of the main beam (2) is always kept in the optimal advancement path.

8. The continuous jacking method for a large-span curved steel beam according to claim 7, characterized in that, In step S520, the position s of the guide beam (3) d (t) is: Among them, s t (t) represents the position of the temporary support being pushed down directly below the guide beam. u d (τ) represents the speed of the pusher drive component; The speed v of the push drive component d (τ) is determined by the dynamic equations, specifically: The total mass of the m-push drive assembly, the front guide beam, the main beam, and the rear guide beam is included. For the acceleration of the push drive component, F d The driving force provided for the driving components F f This includes resistance forces, including friction.

9. The continuous jacking method for a large-span curved steel beam according to claim 7, characterized in that, In step S530, the height h of the adjusting support (8) m (t) is: Among them, v h (t) represents the speed at which the height of the support is adjusted. h m (t-Δt) represents the height of the support at the previous moment.

10. A continuous jacking device for large-span curved steel beams, used to implement the continuous jacking method for large-span curved steel beams as described in any one of claims 1-9, characterized in that, It includes support components (5) on both sides of the permanent pier (1), a jacking drive component (6) on the support components (5), a guide and correction component (7) on the support components (5), and an adjusting support (8); The support assembly (5) includes a main beam splicing bracket (504) located at the rear end of the last permanent pier (1), a jacking temporary bracket (501) located on both sides of the main beam splicing bracket (504) and the permanent pier (1), a supporting temporary bracket (503) located on both sides of the main beam splicing bracket (504) and the permanent pier (1), and a correction temporary bracket (502). The jacking drive assembly (6) uses a motor and a reducer to provide power. The output end of the reducer is connected to a gear through a universal coupling. The gear and rack are engaged. The rack is segmented and fixed to the jacking temporary support (501) by an I-beam. The guide correction assembly (7) is mounted on the correction temporary support (502), and includes a guide roller and a hydraulic cylinder. The guide roller includes a guide wheel, a rubber sleeve, a limiting plate, and a support structure. The adjustable support (8) is mounted on the temporary support (503), and a roller is provided on its top. An adjustment component is also provided between the roller and the adjustable support (8). The adjustment component includes a height adjustment structure and an angle adjustment structure.

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