A bridge dismantling and lowering system and method

Abstract

The present invention discloses a bridge dismantling and lowering system and method, including: a support beam, which is arranged along the length direction of the bridge and fixedly connected to the top of the pier; a track beam, which is arranged in parallel on the top of the support beam; a reaction beam, which is arranged on the track beam along the width direction of the bridge and is slidably connected thereto; a transverse movement system, which is used to drive the reaction beam to move along the track beam; a lowering system, which is arranged on the top of the reaction beam and is used to adjust the height of the beam format block to be dismantled; a longitudinal movement system, which is used to drive the lowering system to move along the reaction beam; a cutting device, which is arranged to cut the beam format block to be dismantled; a control system, which is electrically connected to the transverse movement system, the lowering system, the longitudinal movement system and the cutting device. The present invention is constructed based on the pier support, and rapid positioning is achieved through the transverse movement and longitudinal movement systems, and the continuous and stable lowering of the beam format blocks is achieved in cooperation with the lowering system, which ensures the stability of the system while improving the operation accuracy, and will not affect the surrounding area of ​​the bridge.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and more specifically, to a system and method for dismantling and lowering a bridge. Background Art

[0002] After a certain number of years of operation, a bridge may be unable to meet the requirements of carrying the existing traffic volume. When maintenance and reinforcement still cannot meet the bearing capacity requirements, the bridge needs to be demolished and renovated. For general bridge demolition projects, there are demolition technologies such as controlled blasting, static crushing, mechanical crushing and static cutting technology to choose from.

[0003] However, for the demolition of complex structure bridges in highly urbanized areas, there are usually large traffic flows, dense surrounding buildings, and complex underground pipelines, which makes the working space under the bridge limited during bridge demolition and difficult to construct with traditional large equipment; the bearing capacity of the foundation under the bridge is low, which makes it inconvenient to cast and expand the foundation and set up temporary supports under the bridge; when the beam is cut and separated, there is a structural force system conversion, which requires high stability control of the demolition system. Moreover, such bridges often need to be rebuilt on the spot after demolition. The existing bridge demolition methods and equipment are likely to cause a certain degree of damage and impact on the bridge foundation structure and the surrounding environment, which is not conducive to the rapid switching and stable construction of reconstruction construction.

[0004] In order to solve the above problems, it is necessary to provide a bridge dismantling and lowering system and method, which can better adapt to the characteristics of the construction environment and realize stable and efficient dismantling construction. Summary of the invention

[0005] The purpose of the present invention is to provide a bridge dismantling and lowering system and method, which divides the bridge segments to be dismantled into blocks, and then dismantles and lowers the bridge superstructure based on the pier support, realizes rapid positioning of the beam format blocks to be dismantled through the lateral and longitudinal movement systems, and cooperates with the lowering system to realize continuous and stable lowering of the beam format blocks, thereby improving the operation accuracy and ensuring the stability of the system. The above-mentioned dismantling construction will not affect the bridge infrastructure and the surrounding environment, and subsequent reconstruction construction can be carried out directly after the dismantling is completed.

[0006] In order to achieve these purposes and other advantages according to the present invention, a bridge demolition and lowering system is provided, comprising:

[0007] A plurality of support beams are arranged on the bridge deck at intervals along the width direction of the bridge, and any support beam is arranged along the length direction of the bridge and fixedly connected to the tops of the plurality of piers;

[0008] A plurality of track beams, which correspond to the plurality of support beams one by one, and any track beam is arranged in parallel on the top of the corresponding support beam;

[0009] A reaction beam, which is arranged on the plurality of track beams along the width direction of the bridge and is slidably connected thereto;

[0010] A traverse system, which is configured to drive the reaction beam to move along the length direction of the track beam;

[0011] A lowering system, which is arranged on the top of the reaction beam and is slidably connected thereto, and the lowering system is configured to adjust the height of the beam format blocks to be removed;

[0012] A longitudinal movement system, which is configured to drive the lowering system to move along the length direction of the reaction beam;

[0013] A cutting device, which is configured to cut the beam format to be dismantled into blocks;

[0014] A control system is electrically connected to the transverse movement system, the lowering system, the longitudinal movement system and the cutting device.

[0015] Preferably, the bridge dismantling and lowering system further includes multiple groups of distribution beams, which correspond one-to-one to the multiple support beams, and any group of distribution beams includes multiple distribution beams, which are arranged at intervals between the support beams and the corresponding track beams along the length direction of the corresponding support beams.

[0016] Preferably, in the bridge dismantling and lowering system, the reaction beam comprises a plurality of longitudinal beams which are arranged at intervals along the length direction of the bridge, any one of the longitudinal beams being straddled on the plurality of track beams and being slidably connected thereto; and two transverse connectors which are respectively arranged at both ends of the longitudinal beams, any one of the transverse connectors connecting the plurality of longitudinal beams along the length direction of the bridge.

[0017] Preferably, the bridge dismantling and lowering system comprises a plurality of lifting devices, which are respectively arranged on the plurality of longitudinal beams, and any one of the lifting devices comprises a plurality of lifting devices, which are arranged at intervals on the corresponding longitudinal beams and connected by longitudinal connectors, and any one of the lifting devices comprises:

[0018] A first jack is vertically arranged on the top of the reaction beam and slidably connected thereto; a sling, one end of which is connected to the bottom pushing end of the first jack, and the other end of which is vertically extended downward and connected to a sling point on the beam format block to be dismantled.

[0019] Preferably, in the bridge dismantling and lowering system, the transverse movement system comprises a plurality of transverse movement devices, which are respectively arranged on the plurality of track beams, and any transverse movement device comprises:

[0020] Two transverse fixing seats are respectively arranged on both sides of the reaction beam, and any one of the transverse fixing seats is located on the corresponding track beam and is detachably connected thereto; two second jacks are respectively arranged between the two transverse fixing seats and the reaction beam, and any one of the second jacks is arranged on the corresponding track beam along the length direction of the bridge and is slidably connected thereto, the fixed end of the second jack is connected to the corresponding transverse fixing seat, and the movable end is connected to the reaction beam; a transverse driving mechanism is configured to drive the second jacks to work.

[0021] Preferably, in the bridge dismantling and lowering system, the longitudinal movement system comprises two longitudinal movement fixing seats, which are respectively arranged on both sides of the lowering system, and any one of the longitudinal movement fixing seats is located on the reaction beam and is detachably connected thereto; two third jacks, which are respectively arranged between the two longitudinal movement fixing seats and the lowering system, and any one of the third jacks is arranged on the reaction beam along the width direction of the bridge and is slidably connected thereto, the fixed end of the third jack is connected to the corresponding longitudinal movement fixing seat, and the movable end is connected to the lowering system; and a longitudinal movement driving mechanism is configured to drive the third jacks to work.

[0022] Preferably, the bridge dismantling and lowering system further includes a plurality of mobile brackets, which are respectively arranged between two adjacent track beams, and any mobile bracket includes a mobile track fixed at the bottom of the reaction beam, and the mobile track is arranged along the cutting line of the format block of the beam to be dismantled, and the cutting device is arranged at the bottom of the mobile track and is slidably connected thereto; a driving device is arranged to drive the cutting device to move on the mobile track, and the driving device is electrically connected to the control system.

[0023] The present invention also provides a bridge dismantling and lowering method, comprising:

[0024] S1. Positioning and drilling: a plurality of beam format blocks are divided in the horizontal and vertical directions on the bridge deck of the bridge segment to be dismantled, a block cutting line is marked on the bridge segment to be dismantled, and hoisting holes are preset on the beam format blocks to be dismantled;

[0025] S2. System installation: According to the distribution of the format blocks of the beams to be dismantled, multiple support beams are installed on the top of the piers of the bridge segment to be dismantled. Between two adjacent support beams is a row of format blocks of the beams to be dismantled arranged along the length direction of the bridge. The distribution beam and the track beam are installed in sequence on the top of any support beam. Then, a reaction beam is straddled on multiple track beams along the width direction of the bridge and a lateral movement system is installed in conjunction with it. Then, a lowering system is arranged on the top of the reaction beam and a longitudinal movement system is installed in conjunction with it. Multiple mobile brackets are installed at the bottom of the reaction beam.

[0026] S3, system positioning: using the transverse movement system to drive the reaction beam to move to the top of the beam format block to be dismantled, and using the longitudinal movement system to drive the lowering system to move to the top of the lifting hole;

[0027] S4, pre-lifting by perforation: installing a sling at the lifting hole to form a plurality of lifting points at the top of the beam format block to be removed, and then connecting the bottom ends of a plurality of slings of the lowering system to the plurality of lifting points one by one, and synchronously lifting a plurality of first jacks of the lowering system to pre-lift the beam format block to be removed by force;

[0028] S5, beam cutting: installing a cutting device on a corresponding mobile bracket, starting a driving device, and causing the cutting device to cut the beam format blocks to be disassembled along the marked block cutting lines;

[0029] S6, lowering the beam segment: after the beam body is cut, the multiple first jacks of the lowering system are pushed synchronously, so that the cut beams to be disassembled are continuously lowered in blocks to the beam moving vehicle below, and then transferred to the designated storage area by the beam moving vehicle;

[0030] S7, longitudinal movement of the system: using the longitudinal movement system to drive the lowering system to move to the top of the next span of the beam format block to be dismantled, and repeating the contents of S4-S6 to dismantle and lower the next span of the beam format block to be dismantled;

[0031] S8, system transverse movement: using the transverse movement system to drive the reaction beam to move to the top of the beam format block to be dismantled in the next section, and repeating the contents of S4-S6 to dismantle and lower the beam format block to be dismantled in the next section;

[0032] S9, circular construction: repeat the contents of S7-S8 until the dismantling and lowering construction of all the beam blocks to be dismantled is completed.

[0033] Preferably, in the bridge dismantling and lowering method, in S4, the hoisting hole comprises a plurality of through holes, which are vertically arranged in the middle of the beam format block to be dismantled and correspond one-to-one to the plurality of slings;

[0034] The sling includes a plurality of steel bars, which correspond one-to-one to the plurality of through holes, any steel bar is inserted into the corresponding through hole and both ends respectively pass through the through holes; a plurality of groups of limiting devices, which correspond one-to-one to the plurality of steel bars, any group of limiting devices includes two limiting plates, which are respectively arranged at both ends of the corresponding steel bars, any limiting plate is sleeved on the steel bars and is arranged to be used for pressing the surface of the beam format block to be dismantled; a plurality of lifting ears, which correspond one-to-one to the plurality of steel bars, any lifting ear is arranged on the top of the limiting plate located at the top end of the corresponding steel bar, and the lifting ear is connected to the bottom end of the corresponding sling.

[0035] Preferably, in the bridge dismantling and lowering method, in S6, for the beam format blocks to be dismantled that cannot be directly lowered, the transverse movement system and the longitudinal movement system are first used to translate the beam format blocks to be dismantled as a whole to a safe position, and then the lowering system is used to continuously lower them.

[0036] The present invention has at least the following beneficial effects:

[0037] 1. The dismantling and lowering system of the present invention is supported on the bridge piers, and there is no need to construct an expanded foundation and temporary support under the bridge. It can still be used in an environment where the bearing capacity of the foundation under the bridge is poor, and the load of the dismantling and lowering system can be directly transmitted to the ground foundation through the piers, thereby avoiding further deterioration of the bridge superstructure caused by the construction load, and eliminating the safety hazard of sudden damage to the main beam when the beam format block bearing system is converted. The above-mentioned dismantling construction method has little impact on the construction environment under the bridge, and can be better applied to urban bridge dismantling construction under special conditions such as complex underground pipelines and poor foundation bearing capacity;

[0038] 2. The present invention realizes the free movement of the lowering system in the transverse and longitudinal directions of the bridge in the projection surface space of the bridge through the transverse movement system and the longitudinal movement system, which meets the needs of adaptive changes in the positions of the lowering system and the cutting device when the construction position and the bridge width change without interfering with the original structure of the bridge; at the same time, after the cutting is completed, the transverse movement system and the longitudinal movement system can be used to perform load-carrying translation operations, thereby solving the problem of insufficient construction space due to various reasons;

[0039] 3. The multiple lifting devices in the lowering system of the present invention are intelligently controlled by the control system, which can realize multi-point synchronous and continuous lowering. It can not only be remotely operated, but also has a very high control accuracy, which greatly ensures the construction safety;

[0040] 4. The support beam, distribution beam, track beam and reaction beam in the present invention are all assembled structures of standard components. After disassembly, the single component has a small structure, light weight, convenient turnover, high reuse rate and low overall cost.

[0041] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the plan structure of a bridge dismantling and lowering system according to an embodiment of the present invention;

[0043] Figure 2 It is a schematic diagram of the side elevation construction structure of S4 in a bridge dismantling and lowering method according to an embodiment of the present invention;

[0044] Figure 3It is a schematic diagram of the side elevation construction structure of S6 in the above embodiment;

[0045] Figure 4 It is a schematic diagram of the front elevation construction structure of S6 in the above embodiment;

[0046] Figure 5 Schematic diagram of the installation structure of the sling described in the above embodiment.

[0047] Description of reference numerals:

[0048] 1. Support beam; 2. Distribution beam; 3. Track beam; 4. Reaction beam; 5. Lowering system; 6. Transverse movement system; 7. Longitudinal movement system; 8. First jack; 9. Transverse movement drive mechanism; 10. Longitudinal movement drive mechanism; 11. Pier; 12. Format blocks of beams to be dismantled; 13. Lifting fixture; 14. Rebar; 15. Limiting device; 16. Lifting lug. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0050] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] like Figure 1-5 As shown, the present invention provides a bridge dismantling and lowering system, comprising:

[0052] A plurality of support beams 1 are arranged on the bridge deck at intervals along the width direction of the bridge, and any support beam 1 is arranged along the length direction of the bridge and fixedly connected to the tops of a plurality of piers 11;

[0053] A plurality of track beams 3, which correspond one to one with the plurality of support beams 1, and any track beam 3 is arranged in parallel on the top of the corresponding support beam 1;

[0054] A reaction beam 4, which is arranged across the plurality of track beams 3 along the width direction of the bridge and is slidably connected thereto;

[0055] A transverse movement system 6, which is configured to drive the reaction beam 4 to move along the length direction of the track beam 3;

[0056] A lowering system 5, which is arranged on the top of the reaction beam 4 and is slidably connected thereto, and the lowering system 5 is configured to adjust the height of the beam format block 12 to be removed;

[0057] A longitudinal movement system 7, which is configured to drive the lowering system 5 to move along the length direction of the reaction beam 4;

[0058] A cutting device, which is configured to cut the beam format blocks 12 to be dismantled;

[0059] A control system is electrically connected to the transverse movement system 6, the lifting device, the longitudinal movement system 7 and the cutting device.

[0060] In the above technical scheme, the support beam 1 is arranged on the pier top section of the bridge along the length direction of the bridge, and the length of the support beam 1 can be adjusted according to the length of the bridge segment to be dismantled; the support beam 1 is a multi-section truss structure, and the adjacent trusses are connected by pins, and the cross section of the truss is connected as a whole through a flower stand and an angle steel, which can be quickly assembled. A support seat is provided at the connection between the support beam 1 and any pier 11, and the support beam 1 is integrally erected on multiple piers 11 of the bridge segment to be dismantled through multiple support seats. The track beam 3 is arranged in parallel on the top of the corresponding support beam 1, and the top surface of the track beam 3 is made of stainless steel plate, which is convenient for the reaction beam 4 to slide along the length direction of the track beam 3. The lowering system 5 is arranged on the top of the reaction beam 4. The support beam 1 and the reaction beam 4 below serve as a stable support and sliding basis on the one hand, and on the other hand, a certain height difference is formed between the lowering system 5 and the bridge deck, leaving enough construction space for the lowering system 5 to adjust the height and the cutting device to cut. The bottom end of the lowering system 5 is connected to the hanging point on the beam format block 12 to be dismantled. The lowering system 5 itself has a lifting function. The lowering system 5 can be used to pre-lift the hanging point before the cutting device cuts the beam format block 12 to be dismantled, that is, the height of the hanging point remains unchanged, but the bottom end of the lowering system 5 generates a larger (upward) lifting force on the beam format block 12 to be dismantled, so that the load-bearing system conversion of the beam format block 12 to be dismantled during the cutting process of the cutting device can be smoothly transitioned. After the cutting is completed, the gravity of the beam format block 12 to be dismantled is completely transferred to the lowering system 5. At this time, the lowering system 5 is used to lower the hanging point, and the removal and lowering of the current beam format block can be realized. The transverse movement system 6 is arranged on the track beam 3, and the longitudinal movement system 7 is arranged on the reaction beam 4. The transverse movement system 6 and the longitudinal movement system 7 are both electrically connected to the control system, and can realize the precise positioning of the reaction beam 4 and the lowering system 5 according to the designed position through the control system. The cutting device adopts common concrete cutting equipment, such as an electric cutting machine, a hydraulic cutting machine, a rope saw cutting machine, etc. The lowering system 5 and the cutting device are also electrically connected to the control system, realizing intelligent control of the entire process of demolition and lowering construction, and performing construction according to the set construction sequence, reducing errors in manual operation.

[0061] Since the main beam of the bridge to be demolished usually has many cracks and poor overall performance, there is a safety risk of main beam fracture during the demolition process. The present invention divides the bridge deck of the bridge segment to be demolished into blocks, and any block adopts the form of beam gridding, converting the overall bridge demolition construction into the demolition construction of multiple beam format blocks with a regular distribution, and a demolition and decentralization system suitable for the above-mentioned block mode is designed in a supporting manner. The demolition and decentralization system as a whole cuts and decentralizes the bridge superstructure (beam format blocks) based on the pier support. During the construction, the self-weight of the demolition and decentralization system and the load of the beam format block 12 to be demolished are transmitted to the foundation through the pier 11. The construction load will not further deteriorate the main beam, avoiding the safety hazard of sudden damage to the main beam during the system conversion. At the same time, it can solve the problem of being unable to set up an expanded foundation or set up temporary support under special circumstances such as complex underground pipelines and insufficient bearing capacity of the foundation under the bridge. In addition, the above-mentioned demolition and decentralization system only operates within the space of the bridge projection surface, and can achieve load-carrying translation, without affecting the surrounding space and existing building components, and can meet the construction requirements in an environment with dense surrounding buildings and severely limited construction space. The dismantling and lowering system can be applied to the dismantling of the superstructures of various types of bridges, and is particularly applicable to the dismantling of bridges whose superstructures are beam diaphragms, T beams, π beams, and small box beams.

[0062] In another technical solution, the bridge dismantling and lowering system further includes a plurality of distribution beams 2, which correspond to the plurality of support beams 1 one by one, and any group of distribution beams 2 includes a plurality of distribution beams 2, which are arranged between the support beam 1 and the corresponding track beam 3 along the length direction of the corresponding support beam 1. The distribution beams 2 are of steel structure, and the plurality of distribution beams 2 of the same group are vertically arranged on the top of the corresponding support beam 1 at a reasonable interval. Any distribution beam 2 is locked with the support beam 1 by a U-shaped buckle, which can stably connect the support beam 1 and the track beam 3, and play a role in evenly distributing the upper load to the support beam, further ensuring the stability of the overall support structure (support beam 1, distribution beam 2, track beam 3).

[0063] In another technical solution, in a bridge dismantling and lowering system, the reaction beam 4 includes a plurality of longitudinal beams, which are arranged at intervals along the length direction of the bridge, and any longitudinal beam is arranged on the plurality of track beams 3 and slidably connected thereto; two transverse connectors, which are respectively arranged at the two ends of the longitudinal beams, and any transverse connector connects the plurality of longitudinal beams along the length direction of the bridge. Specifically, the longitudinal beams are composed of profiled steel or steel plate welded parts, and are arranged vertically on the track beam 3 in the horizontal direction. The contact surface between the longitudinal beam and the track beam 3 is provided with a slider and a roller, so that the longitudinal beam can move along the track beam 3 under the drive of the transverse movement system 6. Any longitudinal beam is arranged along the width direction of the bridge, and a plurality of longitudinal beams are arranged in parallel and at intervals on the track beam 3. After adjusting the spacing of the plurality of longitudinal beams, the ends of the plurality of longitudinal beams are fixedly connected using a transverse connector. The transverse connector is detachably connected to the plurality of longitudinal beams, so that the spacing of the plurality of longitudinal beams can be adjusted according to the actual construction conditions. The transverse connector can be a threaded rib, which connects the plurality of longitudinal beams along the length direction of the bridge and is locked and fixed with each longitudinal beam by bolts, so that the plurality of longitudinal beams are connected as a whole. Thereby, a more stable reaction beam support structure is formed, which is conducive to the lowering system to carry out the demolition and lowering operation more stably, and can be suitable for the demolition construction of beam format blocks of different sizes.

[0064] In another technical solution, the bridge dismantling and lowering system, the lowering system 5 includes multiple groups of lifting devices, which are respectively arranged on the multiple longitudinal beams, any group of lifting devices includes multiple lifting devices, which are arranged on the corresponding longitudinal beams at intervals and connected by longitudinal connectors, and any lifting device includes:

[0065] The first jack 8 is vertically arranged on the top of the reaction beam 4 and slidably connected thereto; a sling, one end of which is connected to the bottom pushing end of the first jack 8, and the other end of which is vertically extended downward and connected to the sling point on the beam format block 12 to be dismantled.

[0066] In the above technical solution, multiple groups of lifting devices are provided corresponding to multiple longitudinal beams, and multiple lifting devices form a multi-point continuous lowering system on the reaction beam 4. The number and position of all lifting devices in the lowering system 5 correspond to the number and position of the hanging points on the beam format block 12 to be dismantled. The control system controls multiple first jacks 8 to be lifted or pushed synchronously, thereby realizing the synchronous dismantling and lowering operation under the condition of multiple hanging points. The first jack 8 can be a through-hole jack, which is arranged in the vertical direction, and the steel strand passes through the bottom of the through-hole jack and is connected to the sling, and the sling is vertically connected downward to the corresponding hanging points on the beam format block 12 to be dismantled. The through-hole jack can control the continuous lifting or lowering of the steel strand in the vertical direction. A matching jack driving mechanism is also arranged near the first jack 8. The control system is electrically connected to the jack driving mechanism and sends instructions to it, so as to realize remote control of multi-point synchronous lowering and control the lowering distance of the sling according to the lowering height in actual construction, thereby effectively improving the stability of the construction system and the construction efficiency. At the same time, through the continuous lowering of large-segment beams (i.e., beam format blocks), a large amount of high-altitude step cutting work can be avoided, thereby reducing the safety risks of construction.

[0067] In another technical solution, in the bridge dismantling and lowering system, the lateral movement system 6 includes a plurality of lateral movement devices, which are respectively arranged on the plurality of track beams 3, and any lateral movement device includes:

[0068] Two transverse fixing seats are respectively arranged on both sides of the reaction beam 4, and any one of the transverse fixing seats is located on the corresponding track beam 3 and is detachably connected thereto; two second jacks are respectively arranged between the two transverse fixing seats and the reaction beam 4, and any one of the second jacks is arranged on the corresponding track beam 3 along the length direction of the bridge and is slidably connected thereto, the fixed end of the second jack is connected to the corresponding transverse fixing seat, and the movable end is connected to the reaction beam 4; a transverse driving mechanism 9 is configured to drive the second jack to work.

[0069] Specifically, each track beam 3 is provided with a corresponding transverse movement device, and any transverse movement device is electrically connected to the control device, so that when the transverse movement system 6 is used to drive the reaction beam 4 to move, the reaction beam 4 can be synchronously pushed from multiple points in the length direction of the reaction beam 4, ensuring the stability of the movement of the reaction beam 4 and the accuracy of the moving position. In this embodiment, the second jack is a horizontally arranged hydraulic jack, and the transverse movement drive mechanism 9 is a hydraulic pump station, which can be set at any suitable position in the dismantling and lowering system (in this embodiment, it is set at the end of the track beam 3), and the reaction beam 4 is slidably connected to different track beams 3 through a slide seat, and the movable end of the second jack is connected to the slide seat of the reaction beam 4 located on the same track beam 3, and the fixed end of the second jack is connected to the transverse movement fixed seat on the same side, and the transverse movement fixed seat can be detachably connected to the track beam 3 through a structure such as a latch. The working process of using the transverse movement device to drive the reaction beam 4 to move is as follows: first fix the transverse movement fixed seat on the track beam 3, start the transverse movement driving mechanism 9 to make the movable end of the second jack push outward, that is, push the reaction beam 4 to move a certain distance in the construction direction. When the next construction position is not reached after a single movement, release the temporary fixation between the transverse movement fixed seat and the track beam 3, and drive the second jack to return while the position of the reaction beam 4 remains unchanged, pull the transverse movement fixed seat to move to one side of the reaction beam 4, and fix the transverse movement fixed seat again after the return is completed, and drive the second jack to push outward again to make the reaction beam 4 move for the second stage, and repeat the above process until the reaction beam 4 moves to the set construction position. On the same track beam 3, second jacks are respectively arranged on both sides of the reaction beam 4 to realize the free movement of the reaction beam 4 in different directions. When the second jack on one side is working, the second jack on the other side is not working, and the matching fixing seat is not fixed to the track beam 3, and moves synchronously with the reaction beam 4; when it is necessary to switch the construction direction, it is only necessary to switch the working state of the two second jacks, and there is no need to additionally switch the single second jack, which is convenient for construction. Since the lateral movement system 6 is also electrically connected to the control system, the above-mentioned lateral movement process is controlled by the control system, which can realize the synchronous drive of multiple lateral movement devices on different track beams 3, and improve the accuracy of the lateral movement of the system.

[0070] In another technical solution, in the bridge dismantling and lowering system, the longitudinal movement system 7 includes two longitudinal movement fixed seats, which are respectively arranged on both sides of the lowering system 5, and any one of the longitudinal movement fixed seats is located on the reaction beam 4 and is detachably connected thereto; two third jacks, which are respectively arranged between the two longitudinal movement fixed seats and the lowering system 5, and any one of the third jacks is arranged on the reaction beam 4 along the width direction of the bridge and is slidably connected thereto, the fixed end of the third jack is connected to the corresponding longitudinal movement fixed seat, and the movable end is connected to the lowering system 5; a longitudinal movement driving mechanism 10, which is configured to drive the third jack to work.

[0071] In this embodiment, the third jack is a horizontally arranged hydraulic jack, and the longitudinal movement drive mechanism 10 is a hydraulic pump station, which can be set at any suitable position in the dismantling and lowering system (in this embodiment, it is set at the end of the reaction beam 4). The lowering system 5 is slidably connected to the top of the reaction beam 4 through a slide seat, and the fixed end of the third jack is connected to the longitudinal movement fixed seat on the same side. The longitudinal movement fixed seat can be detachably connected to the reaction beam 4 through structures such as latches. The working process of using the longitudinal movement system 7 to drive the lowering system 5 to move on the reaction beam 4 is as follows: first fix the longitudinal movement fixed seat on the reaction beam 4, start the longitudinal movement driving mechanism 10 to make the movable end of the third jack push outward, that is, push the lowering system 5 to move a certain distance in the construction direction. When the next construction position is not reached after a single movement, release the temporary fixation between the longitudinal movement fixed seat and the reaction beam 4, and drive the third jack to return while the position of the lowering system 5 remains unchanged, pull the longitudinal movement fixed seat to move to one side of the lowering system 5, and fix the longitudinal movement fixed seat again after the return is completed, and drive the third jack to push outward again to make the lowering system 5 perform the second displacement, and repeat the above process until the lowering system 5 moves to the set construction position. The third jacks are respectively arranged on both sides of the lowering system 5 to realize the free movement of the lowering system 5 in different directions. When the third jack on one side is working, the third jack on the other side is not working, and the matching fixed seat is not fixed to the reaction beam 4, and moves synchronously with the lowering system 5; when it is necessary to switch the construction direction, it is only necessary to switch the working state of the two third jacks, and there is no need to additionally change the direction of the single third jack, which is convenient for construction. Since the longitudinal movement system 7 is also electrically connected to the control system, the above longitudinal movement process is controlled by the control system, which can realize the precise displacement of the lowering system on the reaction beam, and improve the accuracy of the longitudinal movement of the system. In addition, when the reaction beam 4 includes a plurality of longitudinal beams arranged in parallel, the longitudinal movement system can be respectively arranged on different longitudinal beams, and synchronous control is performed by the control system to ensure the stability of the movement of the lowering system on the reaction beam.

[0072] In another technical solution, the bridge dismantling and lowering system further includes a plurality of mobile brackets, which are respectively arranged between two adjacent track beams 3, any mobile bracket includes a mobile track, which is fixed at the bottom of the reaction beam 4, the mobile track is arranged along the cutting line of the beam format block 12 to be dismantled, the cutting device is arranged at the bottom of the mobile track and is slidably connected thereto; a driving device, which is arranged to drive the cutting device to move on the mobile track, and the driving device is electrically connected to the control system. In the above technical solution, a mobile bracket is provided between every two adjacent track beams 3, which is used to adjust the position of the cutting device on the bridge deck. Under normal circumstances, the cutting device is generally directly installed on the bridge deck, and the beam format block 12 to be dismantled is cut along the cutting line according to the construction needs, but for bridges with poor bridge deck conditions, the movement of the cutting device on the bridge deck and the cutting operation will affect the beam body, and the movement of the cutting device requires manual assistance, and there is a greater safety risk when the bridge deck moves. To this end, the cutting device is hoisted as a whole by a mobile bracket, the track surface of the mobile track is set on the bottom surface, the cutting device is set on the mobile track through a connecting seat and is slidably connected to it, the driving device can choose a driving motor, the connecting seat is connected to the mobile track through a gear meshing connection, the gear is clamped on the mobile track, with the rotation of the gear, the connecting seat can move freely along the mobile track, and the output shaft of the driving device is fixedly connected to the axis of the gear. In this embodiment, three track beams 3 are provided, and correspondingly, two mobile brackets are respectively provided at the bottom of the reaction beam 4, and a set of cutting devices can be set on each mobile bracket. When the lowering system 5 moves to the corresponding mobile bracket, the cutting device on the mobile bracket is enabled to perform construction, avoiding frequent switching of a single cutting device between the two mobile brackets. Any mobile track is set along the cutting line of the beam format block. Since the cutting line is located outside the hanging point of the beam format block, the mobile track set at the bottom of the reaction beam 4 will not interfere with the connection between the lowering system 5 and the hanging point. After the cutting device is connected to the moving track, the cutting head of the cutting device is set to face directly downward, and the cutting device and the driving device are both electrically connected to the control system. When cutting operation is required, the cutting device and the driving device are simultaneously started by the control system, so that the cutting device cuts the beam format blocks 12 to be disassembled while moving along the moving track (i.e., the cutting line direction) at a set speed, thereby completing the cutting operation with a high degree of automation, avoiding the influence of human factors on the cutting quality and cutting efficiency, and reducing the safety risks of manual operation. In the above embodiment, the cutting device uses a conventional electric cutting machine, and the saw blade is vertically set at the bottom of the cutting machine; when the cutting device uses a rope saw cutting machine, the moving track can also be set in a cross shape, and each movement only requires moving the cutting device to the middle of the corresponding cutting line to complete the cutting operation on the current edge line.After the dismantling and lowering of the beam format blocks at the current (bridge length) position is completed, the cutting device located on the movable bracket on this side can be moved horizontally to the next construction position together with the reaction beam 4, saving the process of moving the cutting device separately, and the movement and operation process of the above-mentioned cutting device are all based on the reaction beam 4 as the fulcrum, that is, the load of the cutting device is always applied to the dismantling and lowering system, and is transmitted to the pier 11 through the track beam 3, the distribution beam 2 and the support beam 1, which will not cause the deterioration of the bridge panel, and effectively reduces the safety risk of construction.

[0073] The present invention also provides a bridge dismantling and lowering method, comprising:

[0074] S1, positioning and drilling: a plurality of beam format blocks are divided in the horizontal and vertical directions on the bridge deck of the bridge segment to be dismantled, a block cutting line is marked on the bridge segment to be dismantled, and a lifting hole is preset on the beam format block 12 to be dismantled;

[0075] Among them, each of the beam format blocks 12 to be dismantled is provided with a hoisting hole, so that the lowering system 5 is connected to the beam format block 12 to be dismantled and hoisted and lowered; when the cutting device uses a rope saw cutting machine, it is also necessary to set a rope threading hole at the intersection of the cutting line of the same beam format block to be dismantled, so as to facilitate the subsequent cutting operation;

[0076] S2, system installation: according to the distribution of the beam format blocks 12 to be dismantled, multiple support beams 1 are installed on the top of the pier 11 of the bridge segment to be dismantled, and a row of beam format blocks 12 to be dismantled is arranged along the length direction of the bridge between two adjacent support beams 1, and the distribution beam 2 and the track beam 3 are installed in sequence on the top of any support beam 1, and then the reaction beam 4 is straddled on the multiple track beams 3 along the width direction of the bridge and the lateral movement system 6 is installed in conjunction with it, and then the lowering system 5 is arranged on the top of the reaction beam 4 and the longitudinal movement system 7 is installed in conjunction with it, and multiple mobile brackets are installed at the bottom of the reaction beam 4;

[0077] Among them, the number and installation position of the support beams 1 are determined according to the distribution of the beam format blocks divided in S1. In this embodiment, the beam format blocks 12 to be dismantled are divided into two columns along the width direction of the bridge, and any column of the beam format blocks 12 to be dismantled are arranged at intervals along the length direction of the bridge. Therefore, three support beams are arranged, which are respectively arranged on both sides and between the two columns of the beam format blocks 12 to be dismantled, and will not affect the construction space within the projection surface of the beam format blocks to be dismantled. Correspondingly, three distribution beams 2 and three track beams 3 are arranged, and the reaction beam 4 spans the top of the three track beams 3; in order to ensure the lifting stability of the lowering system 5, the reaction beam 4 includes two longitudinal beams arranged in parallel and at intervals, and any longitudinal beam is provided with two lifting devices at intervals. The spacing between the longitudinal beams and the spacing between the lifting devices are adjusted according to the distribution of the lifting points on the beam format blocks 12 to be dismantled, and then the two longitudinal beams are connected as a whole using a longitudinal connector, and the two lifting devices on the same longitudinal beam are connected as a whole using a transverse connector; the mobile bracket is used to install and move the cutting device, and the specific structure of the mobile bracket is not shown in the attached drawings;

[0078] S3, system positioning: using the transverse movement system 6 to drive the reaction beam 4 to move to the top of the beam format block 12 to be dismantled, and using the longitudinal movement system 7 to drive the lowering system 5 to move to the top of the lifting hole;

[0079] Among them, the transverse movement system 6 includes three transverse movement devices, which are correspondingly arranged on the three track beams, and can synchronously drive the reaction beam 4 to move along the track beam 3 as a whole under the action of the control system; the longitudinal movement system 7 includes two longitudinal movement devices, which are correspondingly arranged on the two longitudinal beams, and can synchronously drive the two sets of lifting devices to move along the longitudinal beams under the action of the control system, and any longitudinal movement device includes two longitudinal movement fixed seats, two third jacks and a longitudinal movement driving mechanism 10; the specific structures of the transverse movement device and the longitudinal movement device are not shown in the drawings;

[0080] When the first beam format block 12 to be dismantled is constructed, it needs to be positioned by the transverse movement system 6 and the longitudinal movement system 7 respectively, so that the multiple slings of the lowering system 5 can be smoothly connected with the multiple lifting points on the beam format block 12 to be dismantled. There may be multiple beam format blocks 12 to be dismantled (two in this embodiment) below the reaction beam 4 at the same position. After the construction of the first beam format block to be dismantled is completed, only the lowering system 5 can be moved longitudinally to move to the next construction position;

[0081] S4, pre-lifting by perforation: install a sling 13 at the lifting hole, form multiple lifting points at the top of the beam format block 12 to be dismantled, and then connect the bottom ends of the multiple lifting cables of the lowering system 5 to the multiple lifting points one by one, and synchronously lift the multiple first jacks 8 of the lowering system 5 to pre-lift the beam format block 12 to be dismantled; wherein, after the sling 13 is connected with the lifting cable, an integral lifting structure arranged in the vertical direction is formed, and synchronous and continuous lifting of multiple lifting points can be achieved through the control system, and the beam body to be dismantled is pre-lifted before cutting, and the lifting force is pre-applied without changing the position of the beam body to be dismantled, so that the separation of the beam format blocks to be dismantled and the transfer of the gravity system can be carried out more smoothly during the subsequent cutting operation;

[0082] S5, beam cutting: install the cutting device on the corresponding mobile bracket, start the driving device, and make the cutting device cut the beam format block 12 to be disassembled along the marked block cutting line; in this embodiment, a rope saw cutting machine is used to cut the beam format block, and after the cutting device is moved to the middle of a cutting line by the driving device, the cutting rope is passed through the preset rope threading hole on the beam format block, and then the cutting device is started to complete the cutting operation of a single cutting line; then the cutting device is moved along the moving track to the middle of the next adjacent cutting line, and the above steps are repeated;

[0083] S6, lowering the beam section: after the beam body is cut, the multiple first jacks 8 of the lowering system 5 are pushed synchronously, so that the cut beam format blocks 12 to be disassembled are continuously lowered to the beam moving vehicle below, and are transferred to the designated storage area by the beam moving vehicle; during the lowering process, the first jacks 8 of the multiple lifting devices are controlled by the control system to be lowered synchronously and continuously, and the first jacks 8 are through-hole jacks, and the continuous movement of the steel strands is realized through the steps of lifting, clamping, and oil return of the jack cylinder, until the beam format blocks 12 to be disassembled are lowered to the beam moving vehicle directly below;

[0084] S7, system longitudinal movement: use the longitudinal movement system 7 to drive the lowering system 5 to move to the top of the next span of the beam format block 12 to be dismantled, and repeat the contents of S4-S6 to dismantle and lower the next span of the beam format block to be dismantled (that is, to construct the adjacent beam format blocks to be dismantled along the width direction of the bridge); in addition, when the beam format blocks to be dismantled are distributed in more than two rows on the bridge deck, it is necessary to repeat the step of S7 again until the construction of all the beam format blocks 12 to be dismantled below the reaction beam 4 at the same position is completed;

[0085] S8, system transverse movement: using the transverse movement system 6 to drive the reaction beam 4 to move to the top of the beam format block 12 to be dismantled in the next section, repeating the contents of S4-S6 to dismantle and lower the beam format block 12 to be dismantled in the next section (i.e., carrying out construction of adjacent beam format blocks to be dismantled along the length direction of the bridge);

[0086] S9, cyclic construction: repeat the contents of S7-S8 until the dismantling and lowering construction of all the beam format blocks to be dismantled is completed. In S7-S8, the system is controlled to move longitudinally and transversely in order to carry out the construction of adjacent beam format blocks to be dismantled. Generally speaking, in this embodiment, the dismantling of the beam format blocks to be dismantled is carried out in a Z-shaped sequential construction to reduce the single movement stroke and movement frequency of the reaction beam and the lowering system, and further improve the construction efficiency.

[0087] In another technical solution, in the bridge dismantling and lowering method, in S4, the lifting hole includes a plurality of through holes, which are vertically arranged in the middle of the beam format block 12 to be dismantled and correspond one-to-one to the plurality of slings;

[0088] The hanger 13 includes a plurality of steel bars 14, which correspond one-to-one to the plurality of through-holes, and any steel bar 14 is inserted into the corresponding through-hole and its two ends respectively pass through the through-holes; a plurality of groups of limiting devices 15, which correspond one-to-one to the plurality of steel bars 14, and any group of limiting devices 15 includes two limiting plates, which are respectively arranged at the two ends of the corresponding steel bars 14, and any limiting plate is sleeved on the steel bars 14 and is arranged to be used for pressing the surface of the beam format block 12 to be dismantled; a plurality of lifting ears 16, which correspond one-to-one to the plurality of steel bars 14, and any lifting ear 16 is arranged on the top of the limiting plate located at the top end of the corresponding steel bar, and the lifting ear 16 is connected to the bottom end of the corresponding sling.

[0089] In the above technical solution, the steel bar 14 is made of finely rolled threaded steel bar. After the steel bar 14 passes through the corresponding perforations, two limit plates are respectively inserted into the steel bar 14 and fit with the top and bottom surfaces of the beam format block 12 to be dismantled, and then fixed with a locking mechanism such as bolts until the limit plates are pressed against the top / bottom surfaces of the beam format block 12 to be dismantled, thereby pressing the beam format block 12 to be dismantled and stably connecting it with the sling 13, ensuring the stability of the connection between the lifting system composed of the sling 13 and the lifting device and the beam format block 12 to be dismantled during the lowering process. The same steel bar can include more than one finely rolled threaded steel bar. In this embodiment, the same steel bar corresponds to two finely rolled threaded steel bars arranged in parallel. When installing, the limit plates need to be simultaneously inserted into the two finely rolled threaded steel bars and then pressed against the beam format block 12 to be dismantled. A lifting lug 16 is provided on the upper limit plate, and the mounting seat at the bottom of the sling is pinned to the lifting lug 16 to achieve the connection between the upper structure (lifting device) and the lower structure (sling 13) of the lowering system 5.

[0090] In another technical solution, in the bridge dismantling and lowering method, in S6, for the beam format blocks to be dismantled that cannot be directly lowered, the lateral movement system 6 and the longitudinal movement system 7 are first used to translate the beam format blocks 12 to a safe position as a whole, and then the lowering system 5 is used to continuously lower them. In the above technical solution, in the case where there are obstacles below some beam format blocks to be dismantled and they cannot be directly lowered, the lateral movement system 6 and the longitudinal movement system 7 can be used before lowering to translate the beam format blocks 12 to a safe and unobstructed position, and the position of the beam moving vehicle below is adjusted accordingly before lowering.

[0091] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A bridge dismantling and lowering system, It is characterized in that include: A plurality of support beams are arranged on the bridge deck at intervals along the width direction of the bridge, any support beam is arranged along the length direction of the bridge and fixedly connected to the tops of a plurality of piers, a support seat is provided at the connection between the support beam and any pier, and the support beam is integrally erected on the plurality of piers of the bridge segment to be dismantled through the plurality of support seats; A plurality of track beams, which correspond one to one with the plurality of support beams, and any track beam is arranged in parallel on the top of the corresponding support beam; A reaction beam, which is arranged on the plurality of track beams along the width direction of the bridge and is slidably connected thereto; A traverse system, which is configured to drive the reaction beam to move along the length direction of the track beam; A lowering system, which is arranged on the top of the reaction beam and is slidably connected thereto, and the lowering system is configured to adjust the height of the beam format blocks to be removed; A longitudinal movement system, which is configured to drive the lowering system to move along the length direction of the reaction beam; A cutting device, which is configured to cut the beam format to be dismantled into blocks; A control system, which is electrically connected to the transverse movement system, the lowering system, the longitudinal movement system and the cutting device; A plurality of movable brackets are respectively arranged between two adjacent track beams, and any movable bracket comprises a movable track fixed to the bottom of the reaction beam, the movable track is arranged along the cutting line of the beam format block to be dismantled, and the cutting device is arranged at the bottom of the movable track and is slidably connected thereto; A driving device is configured to drive the cutting device to move on the moving track, and the driving device is electrically connected to the control system.

2. A bridge dismantling and lowering system as claimed in claim 1, It is characterized in that It also includes a plurality of groups of distribution beams, which correspond one-to-one to the plurality of support beams. Any group of distribution beams includes a plurality of distribution beams, which are arranged between the support beams and the corresponding track beams at intervals along the length direction of the corresponding support beams.

3. A bridge dismantling and lowering system as claimed in claim 1, It is characterized in that The reaction beam includes a plurality of longitudinal beams, which are arranged at intervals along the length direction of the bridge, and any longitudinal beam is straddled on the plurality of track beams and slidably connected thereto; two transverse connectors, which are respectively arranged at both ends of the longitudinal beams, and any transverse connector connects the plurality of longitudinal beams along the length direction of the bridge.

4. A bridge dismantling and lowering system as claimed in claim 3, It is characterized in that The lowering system includes multiple groups of lifting devices, which are respectively arranged on the multiple longitudinal beams. Any group of lifting devices includes multiple lifting devices, which are arranged on the corresponding longitudinal beams at intervals and connected by longitudinal connecting members. Any lifting device includes: A first jack is vertically arranged on the top of the reaction beam and slidably connected thereto; a sling, one end of which is connected to the bottom pushing end of the first jack, and the other end of which is vertically extended downward and connected to a sling point on the beam format block to be dismantled.

5. A bridge dismantling and lowering system as claimed in claim 1, It is characterized in that The transverse movement system includes a plurality of transverse movement devices, which are respectively arranged on the plurality of track beams, and any transverse movement device includes: Two transverse fixing seats are respectively arranged on both sides of the reaction beam, and any one of the transverse fixing seats is located on the corresponding track beam and is detachably connected thereto; two second jacks are respectively arranged between the two transverse fixing seats and the reaction beam, and any one of the second jacks is arranged on the corresponding track beam along the length direction of the bridge and is slidably connected thereto, the fixed end of the second jack is connected to the corresponding transverse fixing seat, and the movable end is connected to the reaction beam; a transverse driving mechanism is configured to drive the second jacks to work.

6. A bridge dismantling and lowering system as claimed in claim 1, It is characterized in that The longitudinal movement system includes two longitudinal movement fixing seats, which are respectively arranged on both sides of the lowering system, and any one of the longitudinal movement fixing seats is located on the reaction beam and is detachably connected thereto; two third jacks, which are respectively arranged between the two longitudinal movement fixing seats and the lowering system, and any one of the third jacks is arranged on the reaction beam along the width direction of the bridge and is slidably connected thereto, the fixed end of the third jack is connected to the corresponding longitudinal movement fixing seat, and the movable end is connected to the lowering system; a longitudinal movement driving mechanism is configured to drive the third jack to work.

7. A method for dismantling and lowering a bridge, It is characterized in that include: S1. Positioning and drilling: a plurality of beam format blocks are divided in the horizontal and vertical directions on the bridge deck of the bridge segment to be dismantled, a block cutting line is marked on the bridge segment to be dismantled, and hoisting holes are preset on the beam format blocks to be dismantled; S2. System installation: According to the distribution of the format blocks of the beams to be dismantled, multiple support beams are installed on the top of the piers of the bridge segment to be dismantled. Between two adjacent support beams is a row of format blocks of the beams to be dismantled arranged along the length direction of the bridge. The distribution beam and the track beam are installed in sequence on the top of any support beam. Then, a reaction beam is straddled on multiple track beams along the width direction of the bridge and a lateral movement system is installed in conjunction with it. Then, a lowering system is arranged on the top of the reaction beam and a longitudinal movement system is installed in conjunction with it. Multiple mobile brackets are installed at the bottom of the reaction beam. S3, system positioning: using the transverse movement system to drive the reaction beam to move to the top of the beam format block to be dismantled, and using the longitudinal movement system to drive the lowering system to move to the top of the lifting hole; S4, pre-lifting by perforation: installing a sling at the lifting hole to form a plurality of lifting points at the top of the beam format block to be removed, and then connecting the bottom ends of a plurality of slings of the lowering system to the plurality of lifting points one by one, and synchronously lifting a plurality of first jacks of the lowering system to pre-lift the beam format block to be removed by force; S5, beam cutting: installing a cutting device on a corresponding mobile bracket, starting a driving device, and causing the cutting device to cut the beam format blocks to be disassembled along the marked block cutting lines; S6, lowering the beam segment: after the beam body is cut, the multiple first jacks of the lowering system are pushed synchronously, so that the cut beams to be disassembled are continuously lowered in blocks to the beam moving vehicle below, and then transferred to the designated storage area by the beam moving vehicle; S7, longitudinal movement of the system: using the longitudinal movement system to drive the lowering system to move to the top of the next span of the beam format block to be dismantled, and repeating the contents of S4-S6 to dismantle and lower the next span of the beam format block to be dismantled; S8, system transverse movement: using the transverse movement system to drive the reaction beam to move to the top of the beam format block to be dismantled in the next section, and repeating the contents of S4-S6 to dismantle and lower the beam format block to be dismantled in the next section; S9, circular construction: repeat the contents of S7-S8 until the dismantling and lowering construction of all the beam blocks to be dismantled is completed.

8. A method for dismantling and lowering a bridge as claimed in claim 7, It is characterized in that In S4, the lifting holes include a plurality of through holes, which are vertically arranged in the middle of the beam format block to be dismantled and correspond one to one to the plurality of lifting cables; The sling includes a plurality of steel bars, which correspond one-to-one to the plurality of through holes, any steel bar is inserted into the corresponding through hole and both ends respectively pass through the through holes; a plurality of groups of limiting devices, which correspond one-to-one to the plurality of steel bars, any group of limiting devices includes two limiting plates, which are respectively arranged at both ends of the corresponding steel bars, any limiting plate is sleeved on the steel bars and is arranged to be used for pressing the surface of the beam format block to be dismantled; a plurality of lifting ears, which correspond one-to-one to the plurality of steel bars, any lifting ear is arranged on the top of the limiting plate located at the top end of the corresponding steel bar, and the lifting ear is connected to the bottom end of the corresponding sling.

9. A bridge dismantling and lowering method as claimed in claim 7, It is characterized in that In S6, for the beam format blocks to be dismantled that cannot be directly lowered, the lateral movement system and the longitudinal movement system are first used to translate the beam format blocks to be dismantled as a whole to a safe position, and then the lowering system is used to continuously lower them.

Images