Hanging bracket supporting mechanism for bridge incremental launching construction and bridge incremental launching construction method

Abstract

The invention discloses a hanging bracket supporting mechanism for bridge incremental launching construction and a bridge incremental launching construction method, and relates to the technical field of bridge construction. The hanging bracket supporting mechanism for bridge incremental launching construction comprises a counter-force supporting mechanism detachably fixed to a pier column of a bridge pier and a jacking mechanism detachably fixed to a capping beam of the bridge pier, and the counter-force supporting mechanism is located below the jacking mechanism and supports the jacking mechanism; the jacking mechanism comprises a plurality of sets of jacking assemblies which are evenly distributed in the length direction of the pier cover beam at intervals, each jacking assembly comprises a hanging bracket main beam which is arranged in the width direction of the pier cover beam and abuts against the top face of the pier cover beam, and jacking devices are installed at the two ends of each hanging bracket main beam. The top of the hanging bracket main beam is lower than the top of the capping beam check block on the pier capping beam. According to the method, the height of the supporting cushion system in the pushing process is reduced, the pushing gravity center obviously moves downwards, the instability risk of the steel box girder main beam is effectively reduced, the method is particularly suitable for large-span and high-pier bridge pushing construction, and the pushing construction safety can be remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a hanger support mechanism for bridge jacking construction and a bridge jacking construction method. Background Technology

[0002] Bridge jacking construction technology is widely used in bridge construction projects. Using jacking construction technology, bridge sections can be prefabricated and assembled on the bank, and then gradually pushed to the design position by jacking equipment.

[0003] In traditional jacking construction, the jacking equipment is typically placed on top of the pier cap beam. This results in a relatively high support system during the jacking process, raising the beam's center of gravity. When the center of gravity exceeds a reasonable range, the beam is prone to instability during jacking due to uneven stress or external disturbances. This risk is significantly increased, especially in the construction of long-span or high-pier bridges, seriously affecting construction safety. Furthermore, after jacking to its designated position, traditional jacking construction requires a complex process to transfer the beam from the temporary support system to the permanent supports. This process involves multiple dismantling of supports, elevation adjustments, and beam positioning, which not only consumes a large amount of manpower and resources but may also prolong the construction period and reduce overall construction efficiency due to the numerous operational steps.

[0004] Chinese invention patent application CN119373025A discloses a method for rapid lowering of a steel box girder. The technical solution includes: S1, setting up a jacking support, installing a support frame on the jacking support, and setting up a jacking device on the support frame, the jacking device being used to move the steel box girder along the laying direction; S2, after the steel box girder is jacked into place, installing a first lowering device on the pier, the first lowering device abutting against the steel box girder, the first lowering device being used to move the steel box girder downwards; S3, dismantling the support frame and the jacking device, installing a steel crossbeam frame on the jacking support, installing a second lowering device on the steel crossbeam frame, the second lowering device abutting against the steel box girder, the second lowering device being used to move the steel box girder downwards; S4, dismantling the first lowering device, installing a support on the pier, the second lowering device causing the steel box girder to fall onto the support; S5, dismantling the second lowering device, the steel crossbeam frame, and the jacking support. The patented technical solution involves installing different beam-lowering devices on the piers to assist in lowering the steel box girder after it has been pushed into place. Therefore, it can only lower the girder using additional equipment after the pushing of the steel box girder is completed. Thus, it is a beam-lowering process after the pushing is completed. The girder cannot be lowered directly after the pushing is completed, and it cannot play an auxiliary role in the pushing process of the steel box girder. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a hanger support mechanism for bridge jacking construction that can reduce the center of gravity of jacking, improve the efficiency of jacking construction and reduce the difficulty of beam dropping.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a hanger support mechanism for bridge jacking construction, including a reaction support mechanism detachably fixed to the pier column and a jacking mechanism detachably fixed to the pier cap beam. The reaction support mechanism is located below the jacking mechanism and supports the jacking mechanism. The jacking mechanism includes multiple sets of jacking components evenly distributed along the length direction of the pier cap beam. Each jacking component includes a hanger main beam arranged along the width direction of the pier cap beam and abutting against the top surface of the pier cap beam. Jacking equipment is installed at both ends of the hanger main beam. The top height of the hanger main beam is lower than the top height of the cap beam block on the pier cap beam.

[0007] As an improvement to the above solution: the reaction support mechanism includes a square frame composed of crossbeams and longitudinal beams. The square frame is arranged around the outside of the bridge pier column and is fixedly connected to the bridge pier column. Support columns and support braces for supporting the lifting mechanism are fixedly arranged on the square frame. The support columns and support braces form multiple first triangular support structures between the square frame and the supporting lifting mechanism.

[0008] As an improvement to the above solution: the square frame of the reaction force support mechanism is fixedly connected to the bridge pier column by multiple clamps.

[0009] As an improvement to the above solution: the lifting assembly includes a gantry support platform fixedly installed at both ends of the main beam of the gantry, the top height of the gantry support platform being lower than the top height of the pier cap beam; the lifting equipment is installed on the gantry support platform.

[0010] As an improvement to the above solution: the hanger support platform is fixedly connected to the hanger main beam through hanger columns and hanger diagonal braces. The hanger columns and hanger diagonal braces form a second triangular support structure, which corresponds one-to-one with the first triangular support structure.

[0011] As an improvement to the above solution, a support pad is also included, which is vertically raised and lowered by the lifting equipment; the minimum descent height of the support pad is lower than the top height of the main beam of the hanger.

[0012] This invention also discloses a bridge jacking construction method, which employs the hanger support mechanism for bridge jacking construction as described above, and is carried out according to the following steps: Step 1: Install the jacking mechanism and fix the main beam of the jacking assembly to the pier cap beam. Step 2: Install the reaction support mechanism, fix the square frame to the bridge pier column, and install support columns and support braces on the square frame to support the lifting mechanism above. Step 3: Install lifting equipment at both ends of the main beam of the lifting assembly's hanger; Step 4: The main beam of the steel box girder is pushed forward by alternating lifting of the lifting equipment. Step 5: After the jacking is in place, remove the jacking equipment, lower the main beam of the steel box girder, and then remove the reaction support mechanism and the main beam of the hanger in sequence.

[0013] The beneficial effects of this invention are: 1. This invention places the jacking equipment at a low position on both the front and rear sides of the pier cap beam. By lowering the vertical elevation of the jacking equipment, the height of the support system during the jacking process is significantly reduced, and the center of gravity of the jacking is significantly lowered. This can effectively reduce the risk of instability of the main beam of the steel box girder. It is especially suitable for the jacking construction of long-span, high-pier bridges and can significantly improve the safety of jacking construction.

[0014] 2. This invention utilizes the low center of gravity arrangement of the lifting equipment and the direct support of the reaction force support mechanism for the lifting mechanism. During the jacking process, there is no need to set up complex temporary reinforcement measures. After the main steel box girder is jacked into place, the main steel box girder can be directly placed on the bridge pier column, eliminating the complex beam placement process in the traditional jacking construction process. This effectively reduces the number of process steps, shortens the construction cycle, and improves the overall construction efficiency.

[0015] 3. This invention forms a dual support system through the cooperation of the jacking mechanism and the reaction support mechanism, providing a stable and reliable reaction support foundation for the jacking equipment. The overall rigidity of the hanger mechanism is large and the anti-overturning ability is strong, which can assist the jacking work of the main beam of the steel box girder and ensure that the jacking process is smooth and safe. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cooperation between the hanger support mechanism used for bridge jacking construction and the main beam of the steel box girder in this invention. Figure 2 This is a top-view axonometric view of the hanger support mechanism used for bridge jacking construction in this invention, installed on the bridge pier. Figure 3 This is a top-view axonometric drawing of the hanger support mechanism used in bridge jacking construction of the present invention, installed on the bridge pier.

[0017] The markings in the diagram are as follows: 100-Pier column, 200-Pier cap beam, 210-Cap beam stop, 300-Main beam of steel box girder, 400-Reaction support mechanism, 410-Horizontal beam, 420-Longitudinal beam, 430-Support column, 440-Support brace, 450-Clamping hoist, 500-Lifting mechanism, 510-Hanger main beam, 520-Lifting equipment, 530-Hanger support platform, 540-Hanger column, 550-Hanger brace, 560-Support pad. Detailed Implementation

[0018] To facilitate understanding of the present invention, the invention will be further described below with reference to the accompanying drawings.

[0019] In the description of this invention, it should be noted that the terms "front", "rear", "left", "right", "up", "down", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] like Figures 1 to 3 As shown, the gantry support mechanism for bridge jacking construction disclosed in this invention consists of a reaction support mechanism 400 and a jacking mechanism 500. The reaction support mechanism 400 is installed and fixed on the pier column 100, and the jacking mechanism 500 is installed and fixed on the pier cap beam 200. The reaction support mechanism 400 is located below the jacking mechanism 500 and supports the jacking mechanism 500. The reaction support mechanism 400 is used to provide support force for the jacking mechanism 500. The jacking mechanism 500 is used to support the main girder 300 of the steel box girder during the jacking process to lower the center of gravity of the jacking and assist the jacking work of the main girder 300 of the steel box girder.

[0021] Specifically, such as Figures 1 to 3 As shown, the lifting mechanism 500 used in this invention includes multiple sets of lifting components evenly distributed along the length of the pier cap beam 200. Each lifting component includes a main beam 510 of a hanger, which is positioned along the width of the pier cap beam 200 and abuts against its top surface. Lifting devices 520 are installed at both ends of the main beam 510. The top height of the main beam 510 is lower than the top height of the cap beam stop 210 on the pier cap beam 200. The lifting component also includes hanger support platforms 530 fixedly installed at both ends of the main beam 510. The top height of the hanger support platforms 530 is lower than the top height of the pier cap beam 200. The lifting devices 520 are installed on the hanger support platforms 530. This invention, by setting up a lifting mechanism 500 and using a hanger support platform 530 to reduce the installation height of the lifting equipment 520, makes the entire hanger support mechanism adaptable to the core requirement of low center of gravity jacking without beam dropping. By arranging the hanger main beam 510 at a low height to lower the center of gravity of the jacking, no additional temporary support components are needed, simplifying the process, reducing labor and machinery input, and lowering project costs. At the same time, the structure is easy to install and highly adaptable, and can be flexibly adapted to bridge pier cap beams of different widths and specifications, effectively improving versatility.

[0022] The lifting device 520 can be a hydraulic jack. A support pad 560 can also be installed on the lifting device 520. The support pad 560 is fixedly connected to the output end of the lifting device 520. The support pad 560 is vertically raised and lowered under the drive of the lifting device 520. The minimum descent height of the support pad 560 is lower than the top height of the main beam 510 of the hanger.

[0023] In this invention, multiple sets of lifting components that make up the lifting mechanism are evenly distributed along the length of the pier cap beam 200. This can evenly distribute the overall load of the main steel box girder 300 to each stress-bearing part of the pier cap beam 200, avoiding local overload of the pier cap beam 200 and adapting to the stress characteristics of the pier cap beam 200. At the same time, the coordinated work of multiple sets of lifting components can ensure that the main steel box girder 300 is subjected to uniform stress and has a stable posture during the lifting and pushing process, effectively preventing the beam from tilting or deviating, and improving the stability and safety of the pushing construction.

[0024] In this invention, the main beam 510 of the hanger is arranged along the width direction of the pier cap beam 200 and abuts against the top surface of the pier cap beam 200, which increases the contact area between the entire hanger support mechanism and the pier cap beam 200, further optimizing the force transmission effect, reducing local compressive stress, and protecting the pier cap beam 200 from damage. At the same time, this arrangement can adapt to the force requirements in the width direction of the pier cap beam 200, take into account the installation space of the lifting equipment 520, and make the lifting components compact and reasonable, without occupying extra construction space.

[0025] In this invention, the top height of the main beam 510 of the gantry is limited to be lower than the top height of the cap beam stop 210. By making full use of the limiting function of the cap beam stop 210, the lateral displacement of the main beam 510 of the gantry and the lifting components along the width direction of the pier cap beam 200 can be effectively restricted. This avoids the lifting mechanism from shifting or derailing due to load fluctuations or external interference during the lifting and pushing process. At the same time, it does not affect the original anti-falling beam and limiting guidance functions of the cap beam stop 210, thus providing double protection for construction safety. It is especially suitable for the pushing construction conditions of large-span, high-pier bridges.

[0026] Specifically, such as Figures 1 to 3As shown, the reaction support mechanism 400 used in this invention is a square frame composed of a crossbeam 410 and a longitudinal beam 420. The square frame is arranged around the outside of the pier column 100 and is fixedly connected to the pier column 100 by multiple clamps 450. The square frame is fixedly provided with a support column 430 and a support brace 440 for supporting the lifting mechanism 500. The support column 430 and the support brace 440 form multiple first triangular support structures between the square frame and the supporting lifting mechanism 500. The reaction support mechanism 400 is located below the lifting mechanism 500 and provides direct support, forming a dual support system consisting of reaction support and lifting support. The overall structure has a simple and clear force transmission path, which can stably bear the vertical load of the lifting mechanism 500 and the main steel box girder 300, effectively disperse concentrated stress, avoid structural damage caused by excessive local stress, ensure the reliability of force during the entire lifting and pushing process, and at the same time provide a stable reaction foundation for the pushing operation of the main steel box girder 300, meeting the load transfer and anti-overturning requirements of the pushing construction.

[0027] The aforementioned rectangular frame, composed of horizontal beams 410 and vertical beams 420, surrounds the pier column 100. Multiple clamps 450 form a rigid connection with the pier column 100, creating a ring-shaped constraint system on the pier column 100. This increases the contact area and enhances stability. The horizontal beams 410 and vertical beams 420 work together to distribute the concentrated load transmitted by the lifting mechanism 500 evenly throughout the rectangular frame, which is then transferred to the pier column 100 via the clamps 450. This protects the pier column 100 and the rectangular frame structure, enhances the load-bearing capacity of the reaction support mechanism 400, prevents the reaction support mechanism 400 from shifting or overturning, provides a stable installation foundation for the lifting mechanism 500, and is adaptable to pier columns 100 with different cross-sectional specifications, exhibiting strong versatility.

[0028] The aforementioned support columns 430 and support braces 440 form multiple first triangular support structures between the square frame and the lifting mechanism 500. The support columns 430 provide vertical support, while the support braces 440 assist in sharing the load and providing lateral constraints. By utilizing the geometric stability of triangles, a three-dimensional force-bearing system can be formed. This system can stably bear the vertical load of the lifting mechanism 500 and limit its lateral displacement. It significantly improves the overall stiffness and lateral displacement resistance of the reaction support mechanism 400, effectively resists the horizontal impact force and lateral bending moment generated during the lifting and pushing process, prevents the overall hanger support structure from deforming or becoming unstable, and ensures the safety and reliability of the pushing operation.

[0029] like Figures 1 to 3As shown, corresponding to the first triangular support structure composed of the support column 430 and the support brace 440, the hanger support platform 530 in this invention is fixedly connected to the hanger main beam 510 through the hanger column 540 and the hanger brace 550. The hanger column 540 and the hanger brace 550 form a second triangular support structure, which corresponds one-to-one with the first triangular support structure. The second triangular support structure and the first triangular support structure share the hanger support platform 530 as the large end of the triangular support structure. Through the vertical correspondence and coaxial force distribution between the first and second triangular support structures, a continuous and stable vertical force transmission system is formed. The force path is direct, allowing the lifting reaction force to be evenly transmitted and symmetrically balanced, which can significantly improve the overall structural stiffness and stability.

[0030] This invention also discloses a bridge jacking construction method using the aforementioned hanger support mechanism for bridge jacking construction, wherein the jacking construction of the main beam 300 of the steel box girder is carried out according to the following steps: Step 1: Install the lifting mechanism 500. During installation, first fix the main beam 510 of the multiple lifting components to the pier cap beam 200. Then, install a support platform 530 at each end of the main beam 510. The support platform 530 is connected to the main beam 510 through the support column 540 and the support brace 550 to form an integral structure. The whole structure forms a suspended structure that bears the load above.

[0031] Step 2: Install the reaction support mechanism 400; install the clamp 450 and connect and fix the clamp 450 to the pier column 100 with high-strength bolts; then install a longitudinal beam 420 on each side of the pier column 100 and connect and fix it to the clamp 450; install two support columns 430 and support braces 440 under each hanger support platform 530 respectively, the tops of the support columns 430 and support braces 440 are fixedly connected to the bottom of the hanger support platform 530, and the bottoms of the support columns 430 and support braces 440 are fixedly connected to the tops of the longitudinal beams 420; install a crossbeam 410 between the two longitudinal beams 420 to connect the entire reaction support mechanism 400 into a whole.

[0032] Step 3: Install lifting equipment 520 at both ends of the main beam 510 of the lifting assembly; arrange a hydraulic jack as lifting equipment 520 on each support platform 530 of the lifting assembly, and install a support pad 560 on each hydraulic jack to lift the main beam 300 of the steel box girder above.

[0033] Step 4: The PLC synchronous control system is used to realize the alternating lifting of multiple lifting devices 520 to cooperate with the jacking construction of the main beam 300 of the steel box girder.

[0034] Step 5: After the jacking is in place, remove the jacking equipment 520, lower the main beam 300 of the steel box girder, and then remove the reaction support mechanism 400 and the hanger main beam 510 in sequence.

Claims

1. A hanger support mechanism for bridge jacking construction, characterized in that: It includes a reaction support mechanism (400) that can be detachably fixed to the pier column (100) and a lifting mechanism (500) that can be detachably fixed to the pier cap beam (200). The reaction support mechanism (400) is located below the lifting mechanism (500) and supports the lifting mechanism (500). The lifting mechanism (500) includes multiple sets of lifting components that are evenly distributed along the length of the pier cap beam (200). The lifting components include a main beam (510) of a hanger that is arranged along the width of the pier cap beam (200) and abuts against the top surface of the pier cap beam (200). Lifting devices (520) are installed at both ends of the main beam (510). The top height of the main beam (510) is lower than the top height of the cap beam block (210) on the pier cap beam (200).

2. The hanger support mechanism for bridge jacking construction as described in claim 1, characterized in that: The reaction force support mechanism (400) includes a square frame composed of a crossbeam (410) and a longitudinal beam (420). The square frame is arranged around the outside of the pier column (100) and fixedly connected to the pier column (100). The square frame is fixedly provided with a support column (430) and a support brace (440) for the support lifting mechanism (500). The support column (430) and the support brace (440) form multiple first triangular support structures between the square frame and the support lifting mechanism (500).

3. The hanger support mechanism for bridge jacking construction as described in claim 2, characterized in that: The square frame of the reaction support mechanism (400) is fixedly connected to the pier column (100) by multiple clamps (450).

4. The hanger support mechanism for bridge jacking construction as described in claim 2, characterized in that: The lifting assembly includes a gantry support platform (530) fixedly installed at both ends of the gantry main beam (510), the top height of the gantry support platform (530) being lower than the top height of the pier cap beam (200); the lifting device (520) is installed on the gantry support platform (530).

5. The hanger support mechanism for bridge jacking construction as described in claim 4, characterized in that: The hanger support platform (530) is fixedly connected to the hanger main beam (510) through hanger columns (540) and hanger diagonal braces (550). The hanger columns (540) and hanger diagonal braces (550) form a second triangular support structure, which corresponds one-to-one with the first triangular support structure.

6. The hanger support mechanism for bridge jacking construction as described in claim 4, characterized in that: It also includes a support pad (560) installed on the lifting device (520), which is vertically raised and lowered under the drive of the lifting device (520); the minimum lowering height of the support pad (560) is lower than the top height of the main beam (510) of the hanger.

7. A bridge jacking construction method, characterized by: Using the hanger support mechanism for bridge jacking construction as described in any one of claims 2 to 6, the following steps are performed: Step 1: Install the jacking mechanism (500) and fix the main beam (510) of the jacking components to the pier cap beam (200); Step 2: Install the reaction support mechanism (400), fix the square frame to the pier column (100), and install the support column (430) and support brace (440) on the square frame to support the lifting mechanism (500) above. Step 3: Install lifting equipment (520) at both ends of the main beam (510) of the lifting assembly. Step 4: The main beam (300) of the steel box girder is pushed out by alternating lifting of multiple jacking devices (520); Step 5: After the jacking is in place, remove the jacking equipment (520), lower the main beam (300) of the steel box girder, and then remove the reaction support mechanism (400) and the hanger main beam (510) in sequence.

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