Lifting support suitable for incremental launching construction of variable height cross-section bridge and using method thereof

Abstract

The application provides a lifting support suitable for incremental height cross-section bridge incremental launching construction and a use method, comprising a plurality of pile foundations arranged along a bridge incremental launching path, and a support arranged at the top of the pile foundation, characterized in that: a plurality of cross beams are arranged at the top of the support; support columns are arranged at the two ends of the cross beams and used for supporting beam sections; a lifting beam and a plurality of lifting mechanisms are arranged between the two support columns, the lifting mechanisms are provided with vertical columns; the lifting mechanisms are used for lifting the vertical columns, and the lifting beam is arranged at the top of the vertical columns; a plurality of incremental launching devices and support blocks are arranged at the top of the lifting beam and used for incremental launching and supporting the beam sections. The application adopts a stepping lifting mechanism of a hydraulic cylinder cooperating with a tooth meshing structure, breaks through the stroke limitation of a single-stage hydraulic cylinder, can realize continuous adjustment of the elevation in a large range, perfectly adapts to the incremental height cross-section bridge with a large change range of the elevation of the beam bottom, and realizes full mechanization in the lifting process, does not need manual high-altitude increasing and decreasing of the pads, greatly improves the adjustment efficiency, and reduces the safety risk of high-altitude operation.

Description

Technical Field

[0001] This invention relates to the field of bridge jacking technology, specifically to a lifting support and its usage method suitable for jacking construction of bridges with variable height sections. Background Technology

[0002] The incremental launching method is one of the core construction methods for long-span bridges. It has advantages such as construction not being limited by the terrain and hydrology under the bridge, continuous and controllable operation, and minimal interference with the surrounding environment. It is widely used in bridge engineering such as continuous beams, steel box girders, and truss beams.

[0003] In recent years, with the diversification of bridge design and stress design, bridges with variable height sections, such as variable height continuous beams, arch bridges with variable height decks, and curved bridges with variable height beams, have emerged. The bottom elevation of these beams changes continuously along the longitudinal direction of the bridge, which puts forward higher requirements for the support system of the jacking construction.

[0004] The current support system for incremental launching of bridges with variable height sections still has many technical shortcomings, making it difficult to meet the requirements of high-quality construction: Conventional jacking construction techniques in the past mostly used fixed-height steel pipe supports or temporary piers, and the support elevation could not be flexibly adjusted after it was erected once. For beams with variable cross-sections, the support height was generally adjusted manually by adding or removing steel pads. This was not only cumbersome and risky due to the high-altitude operation, but also because the pads were adjusted in stages, resulting in poor accuracy and large step distances. This could not match the continuously changing beam profile, easily causing local stress concentration and uneven stress on the support points, thus affecting the accuracy of the bridge alignment and structural safety. At the same time, different cross-sections required a large number of pads of different specifications, resulting in low material reuse and high construction costs.

[0005] Secondly, the existing intelligent jacking equipment lacks the ability to dynamically adjust the elevation of its support system. Although some intelligent jacking devices can make minor adjustments to the jacking speed and local posture, their bottom support still relies on fixed elevation brackets. They cannot actively adjust the overall support height according to the beam's shape, causing the jacking device to operate in an inclined condition for a long time, which aggravates equipment wear. Moreover, the mismatch between the support point elevation and the design elevation of the beam bottom can easily generate additional internal forces, making it difficult to fundamentally achieve full-path self-adaptation of the support system. Summary of the Invention

[0006] The main objective of this invention is to provide a lifting support and its usage method suitable for the jacking construction of bridges with variable height sections, thereby solving the problems of traditional fixed supports being unable to adapt to beams with variable height sections and having low adjustment efficiency.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A lifting support suitable for the jacking construction of bridges with variable height sections includes several pile foundations set along the jacking path of the bridge, with a support on the top of the pile foundations, and also includes several crossbeams on the top of the support. Both ends of the crossbeam are equipped with support columns to support the beam segment; A lifting beam and several lifting mechanisms are provided between the two support columns, and the lifting mechanisms are equipped with columns. The lifting mechanism is used to lift the column, and the lifting beam is located at the top of the column; The top of the lifting beam is equipped with several jacking devices and support blocks for jacking and supporting the beam segment.

[0008] In the preferred embodiment, the crossbeam has several vertical through holes through which the column passes.

[0009] In a preferred embodiment, the lifting mechanism includes several lifting components, guide wheels, and positioning components; The lifting assembly is used to drive the column to rise and fall; Guide rollers are used to ensure the stability of the column during lifting; The positioning component is used to fix or remove the fixed column.

[0010] In the preferred embodiment, the support frame is equipped with several diagonal braces; The top of the support column is equipped with several pads to increase the support height of the support column; The bottom of the crossbeam is equipped with several connecting seats for connecting the bracket; At least two parallel crossbeams are provided at the same jacking position.

[0011] In the preferred embodiment, the column has toothed grooves on both sides; The lifting mechanism includes two lifting components. Each lifting component includes a first hydraulic cylinder located at the top of the crossbeam, and a lifting seat is provided at the top of the first hydraulic cylinder. The lifting seat is slidably sleeved onto the outside of the column; The lifting seat is equipped with a pair of fixed plates, and a rotating tooth is rotatably connected between the pair of fixed plates, with the rotating tooth meshing with the tooth groove; Both ends of the rotating gear are equipped with rotating shafts, which are rotatably connected to the fixed plate; A brake disc is mounted on the rotating shaft, and a brake caliper is mounted on the fixed plate. The brake caliper is compatible with the brake disc. The mounting plate is equipped with a protective shell, which is located on the outside of the brake disc; An oil tank is located on the crossbeam, and the oil tank is connected to the brake caliper.

[0012] In the preferred embodiment, the lifting seats at the top of the two first hydraulic cylinders are slidably sleeved onto the outside of the column after being combined; the connecting end of the combination is provided with a groove that matches the column, and the connection point during combination is connected by a detachable fixed connection. The lifting platform is equipped with several guide wheels, which abut against the column and can roll along the length of the column.

[0013] In the preferred embodiment, the column is provided with movable grooves on both other sides, and the movable grooves are through grooves; The inner wall of the movable groove is provided with several insertion slots; The positioning component of the lifting mechanism includes two support plates that pass through the movable slot; The support plate has several connector strips on the side near the connector slot, and the connector strips are adapted to the connector slot; Several fixed seats are provided on the crossbeam, and a second hydraulic cylinder is provided on the top of the fixed seats; The output end of the second hydraulic cylinder is connected to the end of the support plate and is used to drive the support plate to move. The second hydraulic cylinder is connected to the fixed base via a fixing buckle.

[0014] In the preferred embodiment, several springs are provided between the two support plates.

[0015] A method for using a lifting support system suitable for incremental launching construction of bridges with variable height sections includes the following steps: S1. Install lifting mechanisms along the bridge jacking path; S2. Based on the target elevation, perform the jacking operation and adjust the lifting beam and jacking device; S3. During the jacking process, different lifting mechanisms dynamically adjust the support height according to the design elevation signal of the bottom of the beam segment.

[0016] In the preferred embodiment, S2 includes: S21. The positioning component of the lifting mechanism releases the lock of the column; S22. The lifting component of the lifting mechanism lifts the column by one stroke or the current stroke; S23, Positioning component locks the column; S24. Remove the restriction between the lifting assembly and the column; The lifting assembly is reset and re-establishes its connection with the column; S25. Once the target distance is reached, proceed to S27; or If the target journey has not been reached, proceed to S26; S26. Repeat S21-S25; S27. The lifting mechanism has completed its work and is awaiting the next instruction.

[0017] This invention provides a lifting support and its usage method suitable for the jacking construction of bridges with variable height sections. By adopting the above solution, the following beneficial effects are achieved: The step-type lifting mechanism, which uses a hydraulic cylinder in conjunction with a toothed structure, breaks through the stroke limitation of a single-stage hydraulic cylinder and can achieve continuous elevation adjustment over a wide range, perfectly adapting to bridges with varying beam bottom elevations. The entire lifting process is mechanized, eliminating the need for manual addition or removal of pads at height, significantly improving adjustment efficiency and reducing safety risks associated with working at height.

[0018] During the lifting process, the rotating teeth are braked by the brake caliper to achieve temporary locking through tooth meshing, ensuring the synchronization of the lifting. Under load, the plug strip of the positioning component mechanically engages with the plug slot of the column to achieve rigid mechanical locking. The vertical load is entirely borne by the mechanical structure, without relying on the hydraulic cylinder for long-term pressure maintenance, thus completely avoiding the risk of settlement caused by hydraulic unloading and significantly improving the stability and safety of the support.

[0019] It can be linked with the intelligent jacking system to dynamically adjust the support elevation according to the real-time position of the beam, realize full-path adaptive support, and effectively ensure the accuracy of the completed bridge alignment.

[0020] The entire structure adopts a standardized modular assembly structure. The pile foundation, support, crossbeam and lifting mechanism can all be prefabricated in the factory and assembled on site, making construction convenient. The lifting mechanism can be disassembled and maintained separately, and it is suitable for bridge jacking construction with different spans and different height changes. The equipment has a high reuse rate and effectively reduces construction costs.

[0021] The dual lifting components are symmetrically arranged, and the synchronous lifting ensures even force distribution, avoiding damage to the equipment due to uneven loading, and improving the service life and smooth operation of the equipment. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure after the present invention has been lifted. Figure 3 This is a schematic diagram of the structural changes during the lifting process of this invention; Figure 4 This is a schematic diagram of the lifting mechanism of the present invention; Figure 5 This is a structural schematic diagram of the lifting mechanism of the present invention from another perspective; Figure 6 This is a front view of the lifting mechanism of the present invention; Figure 7 This is an enlarged structural schematic diagram of the lifting mechanism of the present invention; Figure 8 This is an enlarged structural schematic diagram of the lifting component of the present invention.

[0023] In the picture: 101 pile foundation, 102 bracket, 103 diagonal brace, 104 crossbeam, 105 support column, 106 beam segment, 107 pad, 108 connecting seat, 2 column, 201 movable groove, 202 insertion groove, 203 tooth groove, 3 lifting mechanism, 301 lifting assembly, 311 first hydraulic cylinder, 312 lifting seat, 313 fixed plate, 314 oil tank, 315 rotating tooth, 316 rotating shaft, 317 brake disc, 318 brake caliper, 319 protective shell, 302 guide wheel, 303 positioning assembly, 331 fixed seat, 332 second hydraulic cylinder, 333 fixing buckle, 334 support plate, 335 insertion strip, 336 spring, 4 lifting beam, 501 jacking device, 502 support block. Detailed Implementation

[0024] Example 1: like Figure 1-8 As shown, a lifting support system suitable for the jacking construction of bridges with variable height sections is installed along the longitudinal direction of the bridge at intervals of 5-8m, preferably 6m. The support height can be adjusted from 0 to 5m. It is specifically designed for the jacking construction of continuous beam bridges with variable heights. The specific structure is as follows: The lower support system includes pile foundation 101, bracket 102, diagonal brace 103, crossbeam 104 and support column 105, which constitute the basic load-bearing frame of the entire device.

[0025] Among them, pile foundation 101 is a bored cast-in-place pile. The pile length is determined according to the engineering geological conditions. A pile cap is set on the pile top to provide vertical bearing capacity and horizontal resistance for the overall structure.

[0026] The support 102 is preferably a spiral steel pipe column, which is welded and fixed to the pre-embedded steel plate at the bottom of the pile cap. Each support set has 4 steel pipe columns arranged in a rectangular pattern. Diagonal braces 103 are welded between adjacent support columns. The diagonal braces 103 are preferably steel pipes, arranged in a cross pattern to form a spatial truss structure, which greatly improves the overall lateral stiffness and overall stability of the support 102.

[0027] A flange is welded to the top of the bracket 102, and a connecting seat 108 is correspondingly provided at the bottom of the crossbeam 104. The connecting seat 108 is a thick steel plate with holes, which is fixedly connected to the top flange of the bracket 102 by high-strength bolts, so as to realize the detachable assembly of the crossbeam 104 and the bracket 102.

[0028] At least two horizontal beams 104 are set in parallel at the same jacking position. The horizontal beams 104 are arranged laterally on the top of the support 102 to form the installation foundation of the lifting mechanism 3. Support columns 105 are vertically welded to both ends of the top surface of each horizontal beam 104. The support columns are used for normal auxiliary support of the section with constant cross-section. Steel pads 107 of various thicknesses such as 20mm and 50mm can be stacked on the top of the support columns 105 to assist in coarse adjustment of the support height and adapt to working conditions with large height differences.

[0029] The crossbeam 104 has a square vertical through hole, and the column 2 is inserted into the through hole and can slide vertically along the through hole.

[0030] Column 2 is a box-section steel column, preferably welded from Q355 steel plate, with a single column length of not less than 2m, and is vertically installed in the through hole of beam 104.

[0031] The left and right side walls of the column 2 are vertically machined with continuous toothed grooves 203. The toothed grooves 203 are preferably involute tooth shapes with a module of 10mm and are evenly arranged throughout the height for meshing and transmission with the rotating teeth 315 of the lifting assembly 301.

[0032] The front and rear side walls of the column 2 are provided with through movable grooves 201 along the vertical direction. The movable grooves 201 are through the center line of the column 2. The inner walls of the left and right sides of the movable grooves 201 are uniformly machined with insertion grooves 202 along the vertical direction. The insertion grooves 202 are preferably rectangular grooves, evenly arranged along the entire height, and are used to cooperate with the insertion strips 335 of the positioning component 303 to achieve mechanical locking.

[0033] Furthermore, the lifting mechanism 3 is installed around the column 2 on the top of the crossbeam 104, and consists of three parts: lifting component 301, guide wheel 302 and positioning component 303, to realize the step-by-step lifting and rigid mechanical locking of the column 2.

[0034] Each column 2 is equipped with two sets of symmetrically arranged lifting components 301, located on the left and right sides of the column 2 respectively, which synchronously drive the column 2 to rise and fall.

[0035] The lifting assembly 301 includes a first hydraulic cylinder 311, which is preferably a single-acting piston hydraulic cylinder. The bottom of the cylinder is fixed to the top surface of the crossbeam 104 by flange bolts.

[0036] The piston rod of the first hydraulic cylinder 311 is fixedly connected to a lifting seat 312. The lifting seat 312 is preferably a semi-box-shaped cast steel part. After the two lifting seats 312 are joined together, they form a complete square sleeve, which is fitted onto the outside of the column 2. The mating end faces of the two lifting seats are provided with positioning pins and connecting bolt holes. After being joined together, they can be detachably and fixedly connected by bolts, which is convenient for on-site installation and later maintenance.

[0037] The lifting seat 312 has at least 4 sets of guide wheels 302. The guide wheels 302 are preferably rollers with bearings and covered with polyurethane. They abut against the four side walls of the column 2 and can roll vertically along the column 2. The installation gap of the guide wheels is adjustable to constrain the lateral displacement of the column 2, ensure the verticality of the lifting process, and avoid jamming and uneven wear.

[0038] A pair of fixing plates 313 are vertically welded to the top surface of the lifting seat 312. The two fixing plates 313 are arranged in parallel, and the spacing matches the length of the rotating gear 315. A rotating shaft 316 is installed between the two fixing plates 313 through a bearing seat. The rotating gear 315 is fixedly installed in the middle of the rotating shaft 316 through a flat key. The rotating gear 315 is a cylindrical gear with a module of 10mm, which precisely meshes with the tooth groove 203 on the side wall of the column 2.

[0039] The outer end of the rotating shaft 316 extends out of the fixing plate 313, and a brake disc 317 is coaxially fixedly installed. The brake disc 317 is a cast steel ventilated disc. A hydraulic disc brake caliper 318 is installed on the outer side of the fixing plate 313. The brake caliper 318 cooperates with the brake disc 317 to hold the brake rotating shaft 316 tightly and lock the rotation of the rotating gear 315, thereby fixing the relative position of the column 2 and the lifting seat 312.

[0040] A protective shell 319, welded from steel plate, is fixed to the outside of the fixed plate 313 by bolts. The protective shell completely covers the brake disc 317 and brake caliper 318 to prevent rainwater and dust from corroding the braking components and extend the service life of the equipment.

[0041] The top surface of the crossbeam 104 is also equipped with a small hydraulic oil tank 314, which is equipped with a micro hydraulic power unit. It is connected to the brake caliper 318 through a high-pressure oil pipe to provide hydraulic power to the braking system and realize the electronic control operation of braking and release.

[0042] Furthermore, the positioning component 303 is a mechanical locking mechanism used for rigid fixation of the column 2 under load.

[0043] Each positioning assembly 303 includes four fixing seats 331, which are arranged in pairs on both sides of the column 2 and on both sides of the movable groove 201. The fixing seats 331 are preferably cast steel supports and are fixed to the top surface of the crossbeam 104 by bolts. A second hydraulic cylinder 332 is fastened to the top of the fixing seat 331 by a fixing buckle 333. The second hydraulic cylinder 332 is used to drive the insertion locking and unlocking actions.

[0044] The piston rod end of the second hydraulic cylinder 332 is connected to both ends of the support plate 334. The support plate 334 is a rectangular steel plate that is horizontally inserted into the movable groove 201 of the column 2. Several insertion strips 335 are provided on the side of the support plate 334 near the insertion groove 202. The insertion strips 335 are rectangular steel strips that are adapted to the insertion groove 202 and are positioned one-to-one with the insertion groove 202.

[0045] Multiple return springs 336 are provided between the inner end faces of the two support plates 334. The springs 336 are in a pre-compressed state and provide outward elastic force when locked, which helps the plug strip 335 to smoothly enter the plug groove 202 and ensures stability.

[0046] When locking is required, the piston rod of the second hydraulic cylinder 332 retracts, causing the two support plates 334 to move in opposite directions. The insertion strip 335 enters the insertion groove 202 at the corresponding height, and the column is fixed by mechanical engagement. The vertical load is borne by the contact surface between the insertion strip 335 and the insertion groove 202, without the need for the hydraulic cylinder and lifting assembly 3 to bear the load, which is safe and reliable. When unlocking, the piston rod of the second hydraulic cylinder 332 extends, causing the two support plates 334 to move relative to each other. The insertion strip 335 disengages from the insertion groove 202, and the column 2 regains its freedom of movement.

[0047] Furthermore, the top of the column 2 is fixedly connected to a lifting beam 4 by flange bolts. The lifting beam 4 is preferably made of double I36b I-beams and arranged horizontally.

[0048] The top surface of the lifting beam 4 is equipped with a jacking device 501 and a support block 502. The jacking device 501 is a smart hydraulic jacking slide commonly used in existing jacking construction, equipped with displacement sensors and pressure sensors, which can realize continuous jacking of the beam segment and real-time attitude adjustment; the support block 502 is a steel temporary support block, the top surface of which is flush with the support surface of the jacking slide, used for temporary bearing of the jacking gap and dispersing the contact stress of the beam segment 106.

[0049] Example 2: The specific steps for using a lifting scaffold suitable for the incremental launching construction of bridges with variable height sections are as follows: S1. Install lifting mechanism 3 on the bridge jacking path: S11. According to the bridge longitudinal section design and jacking construction plan, the pile foundation position is laid out and located along the jacking path. The pile foundation 101 and the pile cap are constructed. The bracket 102 and the diagonal brace 103 are installed in sequence. The crossbeam 104 is hoisted and connected to the top flange of the bracket through the connecting seat 108. S12. Insert the column 2 into the through hole of the crossbeam 104, install two sets of lifting components 301 and positioning components 303 in sequence, align and fix the lifting seat 312, and debug to confirm that the rotating gear 315 and the tooth groove 203 mesh well, the guide wheel 302 fits against the side wall of the column, and the operation is smooth. S13. Install the lifting beam 4 on the top of the column, and set up the jacking device 501 and support block 502; connect all hydraulic pipelines and electrical control system, and debug the lifting, braking and locking functions in sequence, mark the initial elevation of each work station, and establish a database of the correspondence between elevation values ​​and the positions of tooth grooves and insertion grooves.

[0050] S2. Based on the target elevation, perform the jacking operation, adjusting the lifting beam 4 and the jacking device 501. Specifically: S21, the piston rod of the second hydraulic cylinder 332 extends, driving the two support plates 334 to move relative to each other, the insertion strip 335 completely disengages from the insertion slot 202, and the mechanical lock of the column 2 is released; at the same time, the spring 336 is compressed. At the same time, the hydraulic system drives the brake caliper 318 to grip the brake disc 317 and lock the rotating gear 315, so that the lifting seat 312 is fixed relative to the column 2; S22, the first hydraulic cylinders 311 on both sides lift at a uniform speed, driving the lifting seat 312 and the column 2 to rise synchronously. If the lifting height reaches the target stroke, the lifting will stop; otherwise, the lifting will stop at the maximum single stroke. S23. After reaching the top of the single stroke, the piston rod of the second hydraulic cylinder 332 retracts, pushing the support plate 334 to move in opposite directions, and the insertion strip 335 is precisely inserted into the insertion slot 202 at the corresponding height, completing the mechanical locking of the column 2. S24, Brake caliper 318 releases brake disc 317, releasing the rotating gear brake; The piston rod of the first hydraulic cylinder 311 retracts at a constant speed, causing the lifting seat 312 to slide down along the column 2 and return to its initial position. During the reset process, the rotating tooth 315 is passively rotated along the tooth groove 203, and the guide wheel 302 is rolled along the side wall of the column 2 to ensure vertical stability; After resetting, brake caliper 318 re-engages, completing one lifting cycle; S25. Compare the current support elevation of column 2 with the design target value; If the target elevation is not reached, proceed with S26; If the target elevation is reached, execute S27; S26. Repeat steps S22-S25, and gradually raise the column to the target elevation through multiple rounds of step-by-step cyclic lifting; S27. After reaching the target elevation, the lifting mechanism 303 remains in a mechanically locked state, and the jacking device 501 is adjusted to the working elevation, waiting for the jacking operation command.

[0051] If it is necessary to lower the support elevation, perform a reverse step operation: brake caliper 318 brakes and locks rotating gear 315, first hydraulic cylinder 311 slightly lifts column 2 so that connector 335 is not under force, positioning component 303 unlocks; first hydraulic cylinder 311 retracts and drives column 2 to descend one stroke; positioning component 303 re-inserts into corresponding connector slot 202 and locks; lifting seat 312 resets, repeating until it is lowered to the target elevation.

[0052] S3. Dynamic elevation adaptive adjustment during the jacking process: S31. The jacking construction begins, and the jacking devices 501 at each work station work together to drive the beam segment 106 forward along the longitudinal bridge; the control system collects the mileage and position information of the beam segment in real time and automatically matches the design elevation of the bottom of the beam at the corresponding position. S32. When beam segment 106 is about to enter the variable height section, the control system sends a pre-adjustment command to the lifting mechanism 3 at the corresponding work station in advance. The lifting mechanism 3 adjusts the support elevation in advance according to the above step process so that the support surface of the jacking device is accurately matched with the bottom elevation of the beam that is about to be reached, so as to avoid the beam from being dislodged or impacted after it arrives. S33. During the sliding process of the beam segment, the lifting mechanism 3 of each station makes slight dynamic adjustments based on the real-time position of the beam and the bottom shape of the beam to ensure that the support surface and the bottom of the beam are always in close contact, the support reaction force is within a reasonable range, avoids the phenomenon of detachment or over-the-top, and ensures that the beam is subjected to uniform force. S34. After the beam segment has completely passed the work station, the lifting mechanism 3 adjusts the support height in advance according to the elevation requirements of the next beam segment, and repeats this cycle to achieve adaptive jacking support for the variable height section throughout the entire path. S35. For normal cross-section sections, pads 107 of corresponding thickness can be installed on the top of the support column 105 to transfer the beam load to the support column 105 for bearing. The lifting mechanism 3 is on standby, reducing equipment wear and extending service life.

[0053] S4, Construction Finishing After the entire bridge jacking operation is completed, the height of the lifting supports at each work station is gradually reduced in reverse order, the jacking device and lifting mechanism 3 are dismantled, and the crossbeam 104 and support 102 are dismantled in sequence. The equipment is then transferred to the next project for use.

[0054] Each jacking or lowering height must be controlled to ensure that the connector 335 can be accurately inserted into the connector slot 202 after stopping. Existing control methods can be used, such as controlling the stroke to be a multiple of the center-to-center distance between adjacent connector slots 202. The hydraulic cylinders used in this application are all existing hydraulic cylinders commonly used for jacking and with controllable stroke. These are existing technologies, which are only referenced here and will not be elaborated upon further.

[0055] The lifting support in this embodiment adopts a combination of step-by-step lifting and mechanical rigid locking, which can actively, continuously and accurately adjust the support elevation, completely solving the pain points of poor support adaptability, low adjustment efficiency and insufficient safety guarantee in the jacking construction of bridges with variable height sections. It can be deeply coordinated with the intelligent jacking system to significantly improve construction efficiency and the quality of the completed bridge alignment.

[0056] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A lifting support system suitable for the jacking construction of bridges with variable height sections, comprising several pile foundations (101) arranged along the jacking path of the bridge, wherein a support (102) is provided on the top of the pile foundations (101), characterized in that: It also includes a bracket (102) with several crossbeams (104) on top; Both ends of the crossbeam (104) are provided with support columns (105) to support the beam segment (106). A lifting beam (4) and several lifting mechanisms (3) are provided between the two support columns (105), and the lifting mechanism (3) is provided with a column (2); The lifting mechanism (3) is used to lift the column (2), and the lifting beam (4) is located on top of the column (2); The top of the lifting beam (4) is equipped with several jacking devices (501) and support blocks (502) for jacking and supporting the beam segment (106).

2. The lifting support for incremental launching construction of bridges with variable height sections according to claim 1, characterized in that: The crossbeam (104) has several vertical through holes, through which the column (2) passes.

3. The lifting support for incremental launching construction of bridges with variable height sections according to claim 1, characterized in that: The lifting mechanism (3) includes several lifting components (301), guide wheels (302) and positioning components (303). The lifting assembly (301) is used to drive the column (2) to rise and fall; The guide wheel (302) is used to ensure the stability of the column (2) during lifting; The positioning component (303) is used to fix or remove the fixed column (2).

4. The lifting support for incremental launching construction of bridges with variable height sections according to claim 1, characterized in that: The bracket (102) is provided with several diagonal braces (103); The top of the support column (105) is provided with several pads (107) to increase the support height of the support column (105); The bottom of the crossbeam (104) is provided with several connecting seats (108) for connecting the bracket (102); At least two parallel crossbeams (104) are provided at the same jacking position.

5. The lifting support for incremental launching construction of bridges with variable height sections according to any one of claims 1-4, characterized in that: The column (2) has toothed grooves (203) on both sides; The lifting mechanism (3) includes two lifting components (301). The lifting component (301) includes a first hydraulic cylinder (311) located on the top of the crossbeam (104). The top of the first hydraulic cylinder (311) is provided with a lifting seat (312). The lifting seat (312) is slidably sleeved on the outside of the column (2); The lifting seat (312) is provided with a pair of fixed plates (313), and a rotating tooth (315) is rotatably connected between the pair of fixed plates (313). The rotating tooth (315) meshes with the tooth groove (203). Both ends of the rotating gear (315) are provided with rotating shafts (316), and the rotating shafts (316) are rotatably connected to the fixed plate (313); A brake disc (317) is provided on the rotating shaft (316), and a brake caliper (318) is provided on the fixing plate (313). The brake caliper (318) is compatible with the brake disc (317). The mounting plate (313) is provided with a protective shell (319), which is located outside the brake disc (317); An oil tank (314) is provided on the crossbeam (104), and the oil tank (314) is connected to the brake caliper (318).

6. The lifting support for incremental launching construction of bridges with variable height sections according to claim 5, characterized in that: The lifting seats (312) on the top of the two first hydraulic cylinders (311) are slidably sleeved on the outside of the column (2) after being combined; the connecting end of the combination is provided with a groove that matches the column (2), and the connection point during combination is connected by a detachable fixed connection. The lifting seat (312) is provided with several guide wheels (302), which abut against the column (2) and can roll along the length of the column (2).

7. The lifting support for incremental launching construction of bridges with variable height sections according to claim 5, characterized in that: The column (2) has movable grooves (201) on both sides, and the movable grooves (201) are through grooves; The inner wall of the movable groove (201) is provided with several insertion grooves (202); The positioning component (303) of the lifting mechanism (3) includes two support plates (334) that pass through the movable slot (201). The support plate (334) is provided with several plug strips (335) on the side near the plug groove (202), and the plug strips (335) are adapted to the plug groove (202); The crossbeam (104) is provided with several fixed seats (331), and the top of the fixed seat (331) is provided with a second hydraulic cylinder (332). The output end of the second hydraulic cylinder (332) is connected to the end of the support plate (334) to drive the support plate (334) to move; The second hydraulic cylinder (332) is connected to the fixed seat (331) by a fixing buckle (333).

8. The lifting support for incremental launching construction of bridges with variable height sections according to claim 7, characterized in that: Several springs (336) are provided between the two support plates (334).

9. A method of using a lifting support as described in any one of claims 1-8 for the incremental launching construction of bridges with variable height sections, characterized in that: Includes the following steps: S1. Install lifting mechanisms (3) on the bridge jacking path. S2. According to the target elevation, perform the jacking operation and adjust the lifting beam (4) and the jacking device (501). S3. During the jacking process, different lifting mechanisms (3) dynamically adjust the support height according to the design elevation signal of the bottom of the beam segment (106).

10. The method of using the lifting support for the incremental launching construction of bridges with variable height sections according to claim 9, characterized in that: S2 includes: S21, The positioning component (303) of the lifting mechanism (3) releases the lock of the column (2); S22, The lifting component (301) of the lifting mechanism (3) lifts the column (2) by one stroke or the current stroke; S23, Positioning component (303) locks the column (2); S24. Release the restriction between the lifting assembly (301) and the column (2); The lifting assembly (301) is reset and re-established to be bound to the column (2); S25. Once the target distance is reached, proceed to S27; or If the target journey has not been reached, proceed to S26; S26, Repeat S21-S25; S27. The lifting mechanism (3) has completed its work and is waiting for the next instruction.

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