Self-adaptive jacking method for slope adjustment jacking of bridge

Abstract

The invention relates to the technical field of bridge slope adjustment jacking, and provides a bridge slope adjustment jacking self-adaptive jacking method which comprises the following steps that a lower layer jacking structure is installed below a cover beam, and an upper layer jacking structure is installed above the cover beam; installing a hydraulic control structure, wherein the hydraulic control structure is used for controlling the vertical jack and the two-way jack to work; based on the slope adjusting jacking requirement, the multiple vertical jacks and the multiple bidirectional jacks are controlled to work through the hydraulic control structure, the jacking heights of the multiple vertical jacks are the same, and the jacking heights and the jacking distances of the multiple bidirectional jacks are different. According to the method, the vertical ascending of the pier column is kept while the upper beam body is jacked according to the theoretical variable slope, and the problem of the overall slope adjustment jacking working condition of the bent bridge and the oblique crossing bridge with the bent cap is solved.

Description

Technical Field

[0001] The present application relates to the technical field of bridge slope adjustment and jacking, and in particular to an adaptive jacking method for bridge slope adjustment and jacking. Background Art

[0002] Bridge slope adjustment jacking is a jacking method that changes the longitudinal slope of the bridge deck. The change trajectory of the bridge deck slope is a rigid body rotation motion of the beam body around a fixed axis. The jacking speed and height of each point on the beam body are proportional to the horizontal distance from the point to the rotation axis. In order to ensure the controllability and safety of the bridge slope adjustment jacking process, and to ensure that the bridge piers remain vertical after jacking, the bridge slope adjustment jacking generally adopts the method of jacking the upper beam body and the lower bridge pier separately in sequence. After the upper beam body is jacked into place for slope adjustment, the lower bridge pier is jacked separately. After the bridge pier is vertically jacked into place, the clearance difference between the left and right sides of the pier column or cap beam and the beam body and the plane misalignment problem are solved by adjusting the height and plane position of the bearing pad stone.

[0003] However, when the bridge to be jacked up by slope adjustment is a pier with a cap beam, since the cap beam adopts the construction method of secondary prestressing, if the upper beam body is jacked up first, the upper load of the cap beam disappears, and cracks will appear on the lower side of the cap beam under the action of prestress, so in this case, it is advisable to jack up the cap beam (including the pier column) and the upper beam body at the same time. However, as mentioned above, for curved bridges and skew bridges, if the cap beam is jacked up together with the beam body, the cap beam must be displaced synchronously with the beam body. After jacking up, the cap beam will tilt in both the longitudinal and transverse directions of the bridge, resulting in the pier column not being vertical after jacking up, and bringing great safety hazards to the jacking operation.

[0004] Therefore, how to ensure that the upper beam is lifted according to the theoretical slope while keeping the piers rising vertically is a difficult problem in the overall slope adjustment and lifting conditions of the covered beams of curved bridges and skew bridges. Summary of the invention

[0005] In order to ensure that the upper beam is lifted according to the theoretical variable slope while maintaining the vertical rise of the pier, which is a problem in the overall slope adjustment and lifting conditions of the covered beams of curved bridges and skew bridges, the present application provides an adaptive jacking method for bridge slope adjustment and lifting.

[0006] The present application provides a bridge slope adjustment and self-adaptive jacking method, which adopts the following technical solutions: A bridge slope adjustment and jacking adaptive lifting method comprises the following steps: A lower jacking structure is installed below the cap beam, the lower jacking structure comprising a first support assembly and a vertical jacking assembly, the first support assembly is installed on the foundation structure of the bottom layer of the bridge and is located on the side of the pier, the vertical jacking assembly is installed on the side of the first support assembly away from the foundation structure of the bottom layer of the bridge, and the telescopic end thereof is fixedly connected to the side of the cap beam close to the pier; An upper jacking structure is installed above the cap beam, the upper jacking structure includes a two-way jacking assembly and a second support assembly, the two-way jacking assembly is installed between the beam body and the cap beam, and the second support assembly is also installed between the beam body and the cap beam; Install a hydraulic control structure, the hydraulic control structure adopts a PLC control system, the PLC control system forms a signal connection with the vertical jack and the bidirectional jack, and is used to control the vertical jack and the bidirectional jack to operate; Based on the slope adjustment and jacking requirements, the multiple vertical jacks and the multiple bidirectional jacks are controlled to work through a hydraulic control structure. The jacking heights of the multiple vertical jacks are the same, and the jacking heights and jacking distances of the multiple bidirectional jacks are different.

[0007] By adopting the above technical scheme, by setting up lower and upper jacking structures and realizing automatic control in conjunction with the hydraulic control structure, it is possible to simultaneously meet the needs of vertical jacking of the cap beam and slope-adjusting jacking of the beam body, and realize vertical jacking of the cap beam without tilting. During the jacking process, it is also possible to ensure that there is no gap between the upper beam body and the lower cap beam, and that the beam body does not twist to cause cracking and deformation. Moreover, the posture adjustment process of the beam body and the cap beam is automatically controlled in real time.

[0008] Preferably, the first support assembly adopts a support column, which is installed on the foundation structure of the bottom layer of the bridge and is located on the side of the pier to provide support force for the vertical jacking assembly; The vertical lifting assembly includes a lifting jack and a first vertical displacement sensor. The lifting jack is installed on the side of the support column away from the foundation structure of the bridge bottom layer, and its telescopic end is fixedly connected to the side of the cap beam close to the pier. The first vertical displacement sensor is installed between the cap beam and the foundation structure.

[0009] By adopting the above technical solution, the support column is used as the first support component to provide stable support for the vertical jacking component, optimize the force transmission path, avoid excessive local force, and ensure the safety and durability of the bridge pier. The first vertical displacement sensor can detect the displacement of the cap beam in real time, and cooperate with the hydraulic control structure to accurately adjust the jacking progress; each jacking jack corresponds to a sensor, which can adapt to the slope adjustment requirements of different bridges. In addition, the support column has a simple structure and is easy to install, which can improve construction efficiency and enhance construction convenience and safety.

[0010] Preferably, a lifting jack is provided on both sides of the same pier along the transverse direction of the bridge, and a first vertical displacement sensor is correspondingly provided for each lifting jack.

[0011] By adopting the above technical solution, jacking jacks are set on both sides of the pier and corresponding displacement sensors are configured, which can reduce the probability of height differences in the cap beam along the cross bridge of the beam body on both sides. While meeting the vertical jacking requirements of the cap beam, the jacking height can be monitored in real time for precise control.

[0012] Preferably, the bidirectional lifting assembly comprises a bidirectional jack, a second vertical displacement sensor and a horizontal displacement sensor, the bidirectional jack is installed on the second support assembly, and the second support assembly and the bidirectional jack are installed between the beam body and the cap beam; Two bidirectional jacks are arranged on each of the cap beams, and each bidirectional jack is correspondingly provided with a second vertical displacement sensor, and the horizontal displacement sensor is installed between the beam body and the cap beam.

[0013] By adopting the above technical solution, two bidirectional jacks are set on each cap beam to meet the adjustment needs of different displacements of the beam body on both sides along the transverse bridge. The corresponding vertical displacement sensors and horizontal displacement sensors can accurately monitor the displacement changes in the vertical and horizontal directions respectively, providing accurate data for slope adjustment and jacking.

[0014] Preferably, the steps of controlling multiple vertical jacks and multiple bidirectional jacks through a hydraulic control structure based on the slope adjustment and jacking requirements include: The pier is cut off first, and after the pier is separated up and down along the vertical plane, the hydraulic control structure controls the upper jacking structure and the lower jacking structure to perform jacking operations simultaneously. The lower jacking structures around each pier are jacked synchronously and maintain the same jacking height; based on the initial position of the beam body and the final position required for jacking, the required jacking height of the upper jacking structure corresponding to the piers in different positions and the displacement required in the horizontal direction are determined.

[0015] By adopting the above technical solution, after cutting off the pier column, the hydraulic control structure enables the upper and lower jacking structures to operate simultaneously, achieving overall coordination and improving construction efficiency. The lower jacking structure is synchronously jacked up to the same height to ensure the vertical rise of the cap beam and maintain the stability of the bridge pier. At the same time, the jacking height and horizontal displacement of the upper jacking structure are determined according to the initial and final positions of the beam body, which can accurately meet the bridge slope adjustment jacking requirements and ensure construction quality.

[0016] Preferably, when the bridge is an oblique bridge, the lower jacking structure is jacked according to the minimum value of the height adjustment required for the entire bridge; the upper jacking structure performs jacking and pushing actions simultaneously, and the hydraulic control structure sets the distance required for jacking and pushing of each upper jacking structure in proportion to the distance between each upper jacking structure and the rotation axis of the slope adjustment origin and based on the distance required for jacking and pushing, and sets the lifting speed of each upper jacking structure in combination with the lifting time of the lower jacking structure.

[0017] By adopting the above technical solution, when the bridge is a skew bridge, this method ensures accurate slope adjustment and jacking in the following ways: the lower jacking structure is jacked according to the minimum value of the overall bridge height adjustment to provide a stable foundation for the upper operation; the upper jacking structure is jacked and pushed synchronously, and the hydraulic control structure sets the jacking and pushing distances in proportion to the distance between each upper jacking structure and the rotation axis of the slope adjustment origin, and sets the speed in combination with the lower jacking time, so as to achieve coordinated operation of various parts, accurately meet the complex slope adjustment and jacking requirements of skew bridges, improve construction accuracy and efficiency, and ensure the stability of the bridge structure.

[0018] Preferably, when the bridge is a curved bridge, the lower jacking structure is jacked according to the minimum value of the height adjustment required for the entire bridge; the upper jacking structure performs jacking and pushing operations, and the hydraulic control structure sets the distance required for jacking and pushing of each upper jacking structure in direct proportion to the distance between each upper jacking structure and the rotation axis of the slope adjustment origin, and based on the distance required for jacking and pushing, and determines the distance required for jacking and pushing of the upper jacking structure corresponding to each pier based on the distance between the rotation axis of the slope adjustment origin at each turning point of the curved bridge, and sets the lifting speed of each bidirectional jack in combination with the lifting time of the lifting jack.

[0019] By adopting the above technical solution, when handling the jacking of the curved bridge for slope adjustment, the lower jacking structure is jacked up at the minimum value of the overall bridge height adjustment to ensure the stability of the foundation. Under hydraulic control, the upper jacking structure accurately sets the jacking and pushing distance in direct proportion to the distance between the upper jacking structure and the rotation axis of the slope adjustment origin, and sets the speed in combination with the lower jacking time. This allows the complex slope adjustment jacking of the curved bridge to be carried out in an orderly manner, and all parts work together, greatly improving the construction accuracy and efficiency, ensuring that the curved bridge structure remains stable after jacking and meeting the engineering quality requirements.

[0020] Preferably, during the lifting and pushing process of the bidirectional jack, the hydraulic control structure receives the displacement change signals output by the second vertical displacement sensor and the horizontal displacement sensor. When the change rate of a displacement change signal is abnormal, the cause of the abnormality is checked and adjustments are made based on the checking results.

[0021] By adopting the above technical solution, during the lifting and pushing process of the bidirectional jack, the hydraulic control structure receives the displacement change signal in real time, and can quickly detect if a certain signal change rate is abnormal. This can not only timely discover potential problems such as jack failure and component wear, but also check whether the sensor has deviations, so as to quickly adjust according to the results of the investigation, ensure the accuracy of the lifting operation, ensure the safety and smooth progress of the bridge slope adjustment and lifting construction, and effectively avoid construction accidents and quality risks caused by failure to detect abnormalities.

[0022] To summarize, by setting up the lower and upper jacking structures and realizing automatic control in conjunction with the hydraulic control structure, it is possible to simultaneously meet the vertical jacking requirements of the cap beam and the slope-adjusting jacking requirements of the beam body, so that the vertical jacking of the cap beam does not occur tilting. During the jacking process, it can also ensure that there is no gap between the upper beam body and the lower cap beam, and that the beam body does not twist to cause cracking and deformation. Moreover, the posture adjustment process of the beam body and the cap beam is automatically controlled in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the steps of an adaptive jacking method for bridge slope adjustment jacking according to the present application; Figure 2 A schematic cross-sectional view of a bridge in the transverse direction of the present application of an adaptive bridge-slope-adjusting jacking method; Figure 3 A schematic cross-sectional view along the bridge of an adaptive jacking method for bridge slope adjustment jacking according to the present application; Figure 4 This is a schematic diagram of a bridge slope adjustment and jacking adaptive jacking method of the present application when the bridge is a skew bridge; Figure 5 This is a schematic diagram of a bridge slope adjustment and adaptive jacking method of the present application when the bridge is a curved bridge. DETAILED DESCRIPTION

[0024] With reference to the accompanying drawings and specific embodiments, the steps, features and advantages of the adaptive jacking method for bridge slope adjustment according to the present application will be described below in an illustrative manner. However, all descriptions should not be used to form any limitations on the present application.

[0025] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature displayed or implied in the drawings, this application still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, and thus it should be considered that these more embodiments according to this application are also within the scope of the description of this document.

[0026] It should also be noted that the terms "disposed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium. Unless otherwise clearly defined, those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0027] Bridge slope adjustment jacking is a jacking method that changes the longitudinal slope of the bridge deck. The change trajectory of the bridge deck slope is a rigid body rotation motion of the beam body around a fixed axis. The jacking speed and height of each point on the beam body are proportional to the horizontal distance from the point to the rotation axis. For an orthogonal straight bridge, the cross section of each pier at the jacking is parallel to the rotation axis, so there will be no change in the transverse slope at each pier section during the slope adjustment jacking; but if it is a curved bridge or a skew bridge, due to the existence of a flat curve in the curved bridge, the cross section of the skew bridge pier is not perpendicular to the center line of the bridge, that is, the distance from the rotation axis to both sides of the cross-bridge at each pier section is different, and the jacking height on both sides of the cross-bridge at the pier will be different during the jacking process, which is directly reflected in the change of the cross slope of the bridge deck at the pier for the curved bridge. In addition, bridge slope adjustment jacking will inevitably cause a change in the projection length of the beam body, which is directly reflected in the misalignment change of the beam body and the pier along the bridge direction at the support.

[0028] Existing bridges are divided into bridges with cap beams and bridges without cap beams. For bridges without cap beams, the upper beam body and the lower bridge piers can be adjusted by jacking up separately. For bridges with cap beams, especially when the bridge is a curved bridge or an oblique bridge, since the cap beam is usually set between the beam body and the pier column, and the cap beam mostly adopts a secondary tensioning prestressing construction method, it is not easy to adopt a jacking method that is separated from the upper and lower parts. Therefore, this application proposes an adaptive jacking method for bridge slope adjustment jacking.

[0029] It should be noted that bridges including cap beams are usually used in urban transportation networks with many road intersections and large spans across rivers or obstacles, expressway transportation networks, and railway transportation networks. Therefore, when obstacles such as road intersections and rivers change, it is necessary to adaptively adjust the corresponding bridges to ensure safety. In other words, the application scope of the adaptive jacking method for bridge slope adjustment proposed in this application is relatively wide.

[0030] The present application also provides an adaptive jacking method for bridge slope adjustment jacking. Figure 1 This is a flow chart of an embodiment of a bridge slope adjustment and jacking adaptive jacking method of the present application. Figure 1 It can be seen that the above-mentioned lifting method may include the following steps: Step S100: installing a lower jacking structure below the cap beam.

[0031] Reference Figure 2 and Figure 3 A lower jacking structure for jacking to a corresponding height is installed under the cap beam. The jacking system in the embodiment of the present application includes a first supporting assembly and a vertical jacking assembly. Through the mutual cooperation of the first supporting assembly and the vertical jacking assembly, the cap beam can be jacked to the desired position; at the same time, there is no need to cut off the connection between the cap beam and the pier.

[0032] Specifically, the first support assembly can adopt the support column in the prior art. The support column in the embodiment of the present application is installed on the foundation structure of the bottom layer of the bridge and is located on the side of the pier to provide support force for the jacking assembly.

[0033] The vertical lifting assembly can be a combination of a lifting jack and a first vertical displacement sensor, wherein the lifting jack is installed on the side of the first support assembly away from the foundation structure of the bridge bottom, and the telescopic end of the lifting jack is fixedly connected to the side of the cap beam close to the pier. Since there may be differences in the adjustment height of the beam along the transverse bridge deck during the slope adjustment of the curved bridge, a lifting jack is set on both sides of the same pier along the transverse bridge direction to reduce the probability of differences in the adjustment height of the cap beam along the transverse bridge direction on both sides of the beam body, so as to meet the requirements of vertical lifting of the cap beam.

[0034] The first vertical displacement sensor is installed between the cap beam and the foundation structure to detect the distance the cap beam moves relative to the foundation structure. Since the lifting height of each lifting jack may be different, each lifting jack is correspondingly provided with a first vertical displacement sensor.

[0035] Step S200: Install an upper jacking structure above the cap beam.

[0036] An upper jacking structure for jacking and slope adjustment is installed above the cap beam. In the embodiment of the present application, the upper jacking structure includes a bidirectional jacking assembly and a second support assembly. Through the cooperation between the bidirectional jacking assembly and the second support assembly, the beam body can be jacked and the slope can be adjusted to the desired position. During the process, the beam body can be kept on the cap beam. In other words, the load on the upper part of the cap beam does not change, or only changes slightly, thereby reducing the probability of cracking on the lower side of the cap beam.

[0037] It should be noted that the support between the cap beam and the beam body is achieved through support pads, and the bridge bearings themselves can be separated and detached naturally. Therefore, when lifting the beam body with the two-way jacking assembly, there is no need to perform cutting operations. You can replace the support pads of appropriate height according to the final lifting height, or install new pads of appropriate height.

[0038] The bidirectional lifting assembly can use a bidirectional jack, a second vertical displacement sensor and a horizontal displacement sensor. The bidirectional jack is installed between the beam and the cap beam. The staff can set a matching pad of appropriate height according to the distance between the beam and the cap beam, so that the bidirectional jack can lift the beam to the required height; the matching pad is usually installed between the bidirectional jack and the cap beam.

[0039] Similarly, two bidirectional jacks are provided on each cap beam to meet the adjustment requirements of different displacements on both sides of the beam body along the transverse direction of the bridge. Each bidirectional jack is provided with a corresponding second vertical displacement sensor, which is used to detect the displacement change of the corresponding bidirectional jack in the vertical direction. The horizontal displacement sensor is used to detect the displacement of the beam body relative to the cap beam along the bridge direction, so the horizontal displacement sensor is installed between the beam body and the cap beam.

[0040] Step S300: Install the hydraulic control structure. The hydraulic control structure in the embodiment of the present application adopts a PLC control system, and the PLC control system forms a signal connection with the vertical jack, the bidirectional jack, the first vertical displacement sensor, the second vertical displacement sensor, and the horizontal displacement sensor. Thus, the working stroke of the vertical jack and the bidirectional jack can be controlled by the PLC control system, and the signals fed back by the first vertical displacement sensor, the second vertical displacement sensor, and the horizontal displacement sensor can be received.

[0041] It should be understood that in this step, cylinders or other medium-driven components for multiple vertical jacks and multiple bidirectional jacks will also be configured to meet the working requirements of the vertical jacks and the bidirectional jacks.

[0042] Step S400: Based on the slope adjustment and jacking requirements, a plurality of vertical jacks and a plurality of bidirectional jacks are controlled to work through a hydraulic control structure.

[0043] Specifically, the staff cut off the pier column, and after the pier column was separated up and down along the vertical plane, the hydraulic control structure controlled the upper jacking structure and the lower jacking structure to perform jacking operations simultaneously. Among them, in the lower jacking structure, the jacking jacks on both sides of each pier column were jacked synchronously and kept at the same jacking height, so as to achieve the purpose of vertical jacking of the cap beam.

[0044] At the same time, in the upper jacking structure, based on the initial position of the beam and the final position required for jacking, the height to be lifted by a group of bidirectional jacks corresponding to piers in different positions and the displacement to be generated in the horizontal direction are determined to meet the purpose of slope adjustment and jacking.

[0045] For example, when the bridge is a skew bridge and the slope of part of the bridge and the height of the bridge as a whole need to be adjusted, Figure 4 AA´ is the origin axis of slope adjustment, and BB´ is adjusted to CC´. AA´ is the vertical line of the bridge centerline at the origin of slope adjustment of the skew bridge, and BB´ is the skew end of the skew bridge, which means that the end face where BB´ is located is not parallel to the AA´ axis.

[0046] Therefore, when the construction workers adjust the position of BB´ with AA´ as the origin axis, the vertical distances between B and B´ and the axis of AA´ are different, resulting in different lifting heights and pushing distances for B and B´. Therefore, the lifting and pushing distances of the two bidirectional jacks corresponding to B and B´ are different, and the lifting heights and pushing lengths of the bidirectional jacks corresponding to the multiple piers between A and B are also different; but the two vertical jacks corresponding to each pier can lift to the same height.

[0047] The specific steps of slope adjustment and lifting are as follows: The lifting jack is lifted according to the minimum height adjustment required for the bridge as a whole. At the same time, the hydraulic control structure receives the first vertical displacement change feedback from the first vertical displacement sensor. The hydraulic control structure can dynamically adjust the lifting speed of the lifting jack according to the received first vertical displacement change.

[0048] At the same time, the two-way jacks perform jacking and pushing actions synchronously. The hydraulic control structure sets the required jacking and pushing distance of each two-way jack in proportion to the vertical distance between each two-way jack and the AA' rotating axis and the distance that B and B' need to be jacked and pushed. It should be noted that the required jacking and pushing distance of each two-way jack is proportional to the vertical distance between each two-way jack and the AA' rotating axis. At the same time, combined with the jacking time of the jacking jack, the jacking speed of each two-way jack is set so that the upper jacking structure and the lower jacking structure complete the corresponding jacking and pushing actions at the same time.

[0049] In the above process, the hydraulic control structure receives the second vertical displacement change feedback from the second vertical displacement sensor and the horizontal displacement change feedback from the horizontal displacement sensor, and the hydraulic control structure can dynamically adjust the lifting speed and pushing speed of the bidirectional jack according to the received first vertical displacement change.

[0050] For example, when the bridge is curved and the slope of part of the bridge and the height of the bridge as a whole need to be adjusted, Figure 5 EE' is the origin axis for adjusting the slope, and F and F' need to be moved to the positions of G and G' by lifting and pushing; E and E' correspond to two bidirectional jacks on the same cap beam. Since the vertical distances between F and F' and the origin axis of EE' are different, the two bidirectional jacks corresponding to F and F' need to lift and push to different distances, and the bidirectional jacks corresponding to the multiple piers between E and F need to lift to different heights and push to different lengths; but the two vertical jacks corresponding to each pier can lift to the same height.

[0051] The specific steps of slope adjustment and lifting are as follows: Similarly, the lifting jack is lifted according to the minimum height adjustment required by the entire bridge. At the same time, the hydraulic control structure receives the first vertical displacement change feedback from the first vertical displacement sensor. The hydraulic control structure can dynamically adjust the lifting speed of the lifting jack according to the received first vertical displacement change.

[0052] At the same time, the two-way jacks perform lifting and pushing actions. The hydraulic control structure sets the lifting and pushing distance of each two-way jack in direct proportion to the distance between each two-way jack and E or E' and the distance that F and F' need to lift and push. It should be noted that the lifting and pushing distance of F and F' needs to take into account the distance from each turning point of the curved bridge to the origin axis; that is, the distance from the origin axis to which the two two-way jacks corresponding to each pier need to lift and push is proportional to the length of the origin axis. At the same time, combined with the lifting time of the lifting jack, the lifting speed of each two-way jack is set so that the upper lifting structure and the lower lifting structure can complete the corresponding lifting and pushing actions at the same time.

[0053] During the lifting and pushing process of the bidirectional jack, the hydraulic control structure will receive the displacement change signals output by the second vertical displacement sensor and the horizontal displacement sensor to detect whether the slope adjustment and jacking operations are normal; when the change rate of a certain displacement change signal is abnormal, the staff is required to make corresponding strategies in time, such as suspending the jacking and pushing operations, checking whether the jack or the sensor is abnormal, and making adjustments based on the results of the investigation.

[0054] Step S500: Fix the cut pier column.

[0055] Since the pier columns are cut off during the jacking process, the cut pier columns need to be reinforced with concrete or other means after the jacking and pushing are completed. After the concrete is completely solidified, the PLC control system, vertical jack, bidirectional jack, first vertical displacement sensor, second vertical displacement sensor, horizontal displacement sensor and other devices are removed.

[0056] In summary, the adaptive jacking method for bridge slope adjustment jacking of the present application avoids the problem of adding counterweights on both sides of the cap beam using the secondary tensioning process in the traditional two-step jacking process. When directly lifting the cap beam for slope adjustment jacking, this method can ensure that the cap beam is lifted vertically without tilting. At the same time, during the jacking process, there will be no gaps between the upper beam body and the lower cap beam, and the beam body will not crack or deform due to torsion. In addition, the posture adjustment process of the beam body and the cap beam is achieved through real-time automatic control technology, which further improves the safety and accuracy of the construction.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bridge slope adjustment and self-adaptive jacking method, characterized in that: The following steps are involved: A lower jacking structure is installed below the cap beam, the lower jacking structure comprising a first support assembly and a vertical jacking assembly, the first support assembly is installed on the foundation structure of the bottom layer of the bridge and is located on the side of the pier, the vertical jacking assembly is installed on the side of the first support assembly away from the foundation structure of the bottom layer of the bridge, and the telescopic end thereof is fixedly connected to the side of the cap beam close to the pier; An upper jacking structure is installed above the cap beam, the upper jacking structure includes a two-way jacking assembly and a second support assembly, the two-way jacking assembly is installed between the beam body and the cap beam, and the second support assembly is also installed between the beam body and the cap beam; Install a hydraulic control structure, the hydraulic control structure adopts a PLC control system, the PLC control system forms a signal connection with the vertical jack and the bidirectional jack, and is used to control the vertical jack and the bidirectional jack to operate; Based on the slope adjustment and jacking requirements, the multiple vertical jacks and the multiple bidirectional jacks are controlled to work through a hydraulic control structure. The jacking heights of the multiple vertical jacks are the same, and the jacking heights and jacking distances of the multiple bidirectional jacks are different.

2. The bridge slope adjustment and self-adaptive jacking method according to claim 1 is characterized in that: The first support assembly adopts a support column, which is installed on the foundation structure of the bottom layer of the bridge and is located on the side of the pier to provide support force for the vertical jacking assembly; The vertical lifting assembly includes a lifting jack and a first vertical displacement sensor. The lifting jack is installed on the side of the support column away from the foundation structure of the bridge bottom layer, and its telescopic end is fixedly connected to the side of the cap beam close to the pier. The first vertical displacement sensor is installed between the cap beam and the foundation structure.

3. The bridge slope adjustment and self-adaptive jacking method according to claim 2 is characterized in that: A lifting jack is arranged on both sides of the same pier along the transverse direction of the bridge, and each lifting jack is correspondingly provided with a first vertical displacement sensor.

4. The bridge slope adjustment and self-adaptive jacking method according to claim 1 is characterized in that: The bidirectional lifting assembly includes a bidirectional jack, a second vertical displacement sensor and a horizontal displacement sensor, the bidirectional jack is installed on the second support assembly, and the second support assembly and the bidirectional jack are installed between the beam body and the cap beam; Two bidirectional jacks are arranged on each of the cap beams, and each bidirectional jack is correspondingly provided with a second vertical displacement sensor, and the horizontal displacement sensor is installed between the beam body and the cap beam.

5. The bridge slope adjustment and self-adaptive jacking method according to claim 1 is characterized in that: The steps of controlling multiple vertical jacks and multiple bidirectional jacks by a hydraulic control structure based on the slope adjustment and jacking requirements include: The piers are first cut off. After the piers are separated up and down along the vertical plane, the hydraulic control structure controls the upper jacking structure and the lower jacking structure to perform jacking operations simultaneously. The lower jacking structures around each pier are jacked synchronously and maintain the same jacking height. Based on the initial position of the beam body and the final position required for jacking, the required jacking height of the upper jacking structure corresponding to the piers at different positions and the displacement required in the horizontal direction are determined.

6. The self-adaptive bridge jacking method for slope adjustment according to claim 5 is characterized in that: When the bridge is an oblique bridge, the lower jacking structure is jacked according to the minimum value of the height adjustment required for the entire bridge; the upper jacking structure performs jacking and pushing actions simultaneously, and the hydraulic control structure sets the required jacking and pushing distance of each upper jacking structure in proportion according to the distance between each upper jacking structure and the rotation axis of the slope adjustment origin and based on the required jacking and pushing distance, and sets the jacking speed of each upper jacking structure in combination with the jacking time of the lower jacking structure.

7. The self-adaptive bridge jacking method for slope adjustment according to claim 5 is characterized in that: When the bridge is a curved bridge, the lower jacking structure is jacked according to the minimum value of the height adjustment required for the entire bridge; the upper jacking structure performs jacking and pushing operations, and the hydraulic control structure sets the distance required for jacking and pushing of each upper jacking structure in direct proportion to the distance between each upper jacking structure and the rotation axis of the slope adjustment origin, and based on the distance required for jacking and pushing, and determines the distance required for jacking and pushing of the upper jacking structure corresponding to each pier based on the distance between the rotation axis of the slope adjustment origin at each turning point of the curved bridge, and sets the lifting speed of each bidirectional jack in combination with the lifting time of the lifting jack.

8. The bridge slope adjustment and self-adaptive jacking method according to claim 4 is characterized in that: During the lifting and pushing process of the bidirectional jack, the hydraulic control structure receives the displacement change signals output by the second vertical displacement sensor and the horizontal displacement sensor. When the change rate of a displacement change signal is abnormal, the cause of the abnormality is checked and adjustments are made based on the checking results.

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