Overall Synchronous Lateral Traction Device and Method for Replacing Old Railway Bridges with New Ones

Abstract

The present invention discloses an overall synchronous lateral traction device and a traction method for replacing an old elevated railway bridge with a new one. The device includes a slide rail; the old beam body is slidably fitted on the slide rail through a first slider, and the new beam body is slidably fitted on the slide rail through a second slider; the second slider is higher than the first slider; first traction systems and second traction systems are provided at each node of the old beam body and the new beam body; the front end of the first traction rope of the first traction system is stuck in the front opening of the first anchor hole of the front steel truss; then it is tightened by a lower tension pulley and connected to a first traction type jack; after the front end of the second traction rope of the second traction system is stuck in the front leveling truss, it is tightened successively by a rear tension pulley, then reversed by upper and lower reversing pulleys, and then tightened by an upper tension pulley and connected to a second traction type jack; the key of this method is to first synchronously laterally traction a section of the old beam section and a flush new beam section, and then separately traction the new beam section. The device and method can avoid the entanglement and interference between the traction rope systems of the new beam body and the old beam body.

Description

Technical Field

[0001] The present invention relates to the technical field of beam moving and replacing construction for elevated railway bridges, and specifically to an overall synchronous lateral traction device for replacing old beams with new ones on elevated railway bridges and a traction method based on this device. Background Art

[0002] With the rapid development of urban rail transit to promote local economy and facilitate people's travel, it is often necessary to add stations in the existing elevated railway double-track section, changing the railway from two tracks to four tracks; this requires laterally moving the old beam body, that is, the simply supported reinforced concrete T beam supporting the double-track railway, from the center line position of the existing railway line, and laterally moving the new beam body, that is, the precast turnout continuous steel box girder that changes the railway from two tracks to four tracks, to the center line position of the existing railway line, and the above process of replacing the old beam with a new one must be completed as soon as possible to meet the rigid requirement of restoring the operation of this railway line within 10 hours.

[0003] Due to the existence of high-voltage catenary above the railway line, the above process of replacing the old beam with a new one cannot be carried out by quickly lifting and transporting with a large crane, and only a more cumbersome lateral traction method can be adopted. The specific operation process is as follows.

[0004] First, perform pre-construction, that is, drive piles on the ground and pour concrete caissons on the pile tops, and then construct multiple columns on the caissons. Among them, every four columns distributed at the four corners of a rectangle form a group, and diagonal braces and transverse connecting beams for reinforcement are provided between each group of columns; then, longitudinally main beams are fixedly placed on the tops of each column, and transversely main beams are fixedly placed on each longitudinally main beam. The longitudinal direction refers to the length direction of the railway, and the transverse direction refers to the width direction along the railway. The above pile foundation, caisson, column, longitudinally main beam, and transversely main beam together constitute the sliding support for beam moving and replacing; then, a base plate parallel to the main beam is constructed and fixed on each transverse main beam of the sliding support, and a slide rail is fixed on the base plate; subsequently, lifting-type jacks are set on the piers of the old beam body, that is, the simply supported reinforced concrete T beam, and the old beam body is lifted. Then, a first slider is slidably arranged in the slide rail under the old beam body, and the lifting-type jack is lowered to fix the old beam body on the first slider; then, the new beam body, that is, the turnout continuous steel box girder, is erected on the top of the sliding support on one side of the railway, and a second slider is slidably arranged in each slide rail, and the bottom end of the new beam body is fixed on the second slider; thus far, both the new beam body and the old beam body are slid into place on the transverse slide rail, and the pre-preparation work is completed.

[0005] Then, the core process of beam shifting and replacement is carried out. Since it is impossible to lift the beam, the idea of pulling the old beam body and pushing the new beam body is adopted. Specifically, a traction type jack is fixed on one side of the railway, and a traction rope is used to connect an old beam section of the old beam body. By driving the traction type jack to pull the traction rope, this section of the old beam section is laterally moved outwards from the center line of the railway line. At the same time, a jacking type jack is fixed on the other side of the railway, and this jack is used to push a new beam section of the new beam body inwards. However, since the stroke of this jack is much smaller than the distance between the initial position of the new beam body and the center line of the railway line, only the method of continuously and repeatedly stacking auxiliary pads in front of the piston rod of this jack can be adopted. That is, whenever this jack is pushed to the upper limit of its stroke, the piston rod is retracted, and an auxiliary pad is added in front of the piston rod. Then, this jack is driven again to push the auxiliary pad. After being pushed to the upper limit of the stroke, it is retracted again, and then another auxiliary pad is added, and then it is pushed to the upper limit of the stroke again... and so on, until this new beam section is pushed to the position of the center line of the railway line.

[0006] During the construction process of the above beam shifting and replacement, the traction type jack can continuously pull and operate, so it has a high speed and high work efficiency. However, the jacking type jack needs to continuously stack auxiliary pads and cannot continuously operate. Therefore, it has a slow speed and low efficiency, which slows down the process and efficiency of the entire beam shifting and replacement process. Some people also proposed to adopt the method of continuous traction and dragging for both the new beam body and the old beam body, but it was found that there were many difficulties in actual operation. This is because the traction rope system of the new beam body needs to cross the traction rope system of the old beam body, and it is difficult to overlap the new and old traction ropes. It is easy to interfere with each other. Moreover, the distances that both the new and old beam bodies need to be laterally moved are large, resulting in long lengths of both the new and old traction ropes, making it more likely to occur vertical drooping and entanglement, and mutual winding.

[0007] Moreover, in addition to the problem of the layout of the traction ropes of the new and old beam bodies, whether it is the new beam body or the old beam body, only the form of separately laterally moving each beam section can be adopted, that is, only one old beam section can be pulled and one new beam section can be pushed in each batch. After the new and old beam sections of this batch are moved in place, the same method is used to pull the next old beam section and push the next new beam section, and so on, until the new beam body and the old beam body are moved in place as a whole. This will further lead to cumbersome operation and low efficiency. However, if multiple beam sections are pulled or pushed simultaneously, the adjacent beam sections often interfere with each other by leaning against and pushing during the pushing and pulling force process, and it is difficult for each beam section to maintain the correct posture and move synchronously. The stability of the movement is poor, and it is easy to get stuck. Of course, some technicians in the industry even proposed to first temporarily weld the heads and tails of each beam section of the new beam body or the old beam body, and then manually cut off the welded part by gas cutting after the lateral movement is in place. However, the repeated welding and gas cutting operations are cumbersome, and it will also waste valuable time within 10 hours, and it is easy to damage the steel structure at the end of the new beam section. Summary of the Invention

[0008] One technical problem to be solved by the present invention is to provide an overall synchronous lateral traction device for replacing an old railway bridge with a new one, which can adopt a traction and dragging method for both the new beam body and the old beam body, and can avoid the entanglement and interference between the traction rope systems of the new beam body and the old beam body.

[0009] One technical solution of the present invention is to provide an overall synchronous lateral traction device for replacing an old railway bridge with a new one, which includes a plurality of laterally extending base plates, and a slide rail is fixed on each base plate; the old beam body is slidably matched with the corresponding slide rail through a first slider, and the new beam body is slidably matched with the corresponding slide rail through a second slider; a first reaction frame is fixed on the base plate at the rear end of the slide rail, a first traction type jack is installed on the first reaction frame, and the second slider is higher than the first slider; first traction systems and second traction systems are provided at each node of the old beam body and the new beam body; the first traction system includes a first traction rope, a front steel truss and a rear steel truss fixed on both sides of the old beam body; a lower tension pulley is arranged below the rear steel truss; the front end of the first traction rope passes through a first anchor hole at the lower part of the front steel truss, and the front end of the first traction rope is clamped by a first anchor head at the front opening of the first anchor hole; the middle section of the first traction rope is tightened by the lower tension pulley and connected with the first traction type jack; the second traction system includes a second reaction frame fixed on the base plate at the rear end of the slide rail, a second traction type jack fixed on the second reaction frame, a second traction rope, an upper tension pulley installed on the upper part of the rear steel truss, two upper and lower reversing pulleys installed on the upper part of the front steel truss, and a front leveling truss and a rear leveling truss fixed on both sides of the new beam body, and a rear tension pulley is arranged on the rear leveling truss; the front end of the second traction rope passes through a second anchor hole of the front leveling truss, and the front end of the second traction rope is clamped by a second anchor head at the front opening of the second anchor hole. The middle section of the second traction rope is tightened by the rear tension pulley in sequence, then is reversed by the upper reversing pulley and the lower reversing pulley, and then is tightened by the upper tension pulley and connected with the second traction type jack;

[0010] The first traction system further includes a bottom steel truss located below the old beam body; the bottom steel truss extends laterally and sleeves the corresponding first sliders, and dense vertical fences are arranged at positions close to each first slider, and the vertical fences are welded to the adjacent first sliders; the front and rear ends of the bottom steel truss protrude from both sides of the old beam body, and triangular frames are connected to the top surfaces of the protruding parts at both ends of the bottom steel truss. The vertical resisting plates of each triangular frame are connected to the corresponding side webs of the old beam body through implanted screw bars; the front steel truss and the rear steel truss are respectively welded to the side surfaces of the front and rear protruding parts of the bottom steel truss.

[0011] Another technical problem to be solved by the present invention is to provide a traction method based on the traction device of the present application, which can adopt a traction and dragging method for both the new beam body and the old beam body, and can avoid the entanglement and interference between the traction rope systems of the new beam body and the old beam body.

[0012] One technical solution of the present invention is to provide a traction method based on the traction device of the present application, and the steps are as follows:

[0013] Set up sliding supports and lay the railway-crossing slide rails on each transverse main beam of the sliding supports;

[0014] Build each new beam segment for assembling the new beam body outside the railway range in front of the slide rails, and slide each new beam segment onto the corresponding slide rails in a sliding fit by using the second sliders fixed at the bottom of the new beam segments; jack up each old beam segment of the old beam body by using the jacking jacks installed on each pier of the old beam body, insert the first sliders of each bottom steel truss into the corresponding slide rails and push each bottom steel truss to the lower side of the corresponding old beam segment, then lower the jacking jacks to lower each old beam segment, and then fix the webs of each old beam segment and the protruding parts of the corresponding bottom steel trusses with tripods; then arrange the first traction system and the second traction system at each node of the old beam body and the new beam body;

[0015] Viewed from the level of each beam segment, synchronously start the corresponding first traction jacks and second traction jacks, synchronously horizontally traction an old beam segment and the new beam segment flush with it until the old beam segment is pulled out of the safe range of the railway, then turn off the first traction jacks and continue to drive the second traction jacks, and continue to traction the new beam segment until the new beam segment reaches the railway center line position.

[0016] Compared with the prior art, the above overall synchronous horizontal traction device and method for replacing the old railway bridge with a new one have the following advantages.

[0017] First, in view of the problem that the traction ropes are long and prone to sagging, a lower tension pulley is equipped to tighten the relatively short first traction rope, and a rear tension pulley, two reversing pulleys and an upper tension pulley are equipped together to tighten the longer second traction rope, so that the two traction ropes are always kept taut and do not sag, reducing the probability of the two traction ropes being wound and disturbed; moreover, the first slider and the second slider are deliberately designed with an obvious height difference, so as to significantly increase the height difference between the two traction ropes in the overlapping area, further reducing the probability of mutual interference and disturbance of the two overlapping traction ropes in the old beam area; and the upper and lower reversing pulleys can not only tighten the traction ropes, but also successfully reduce the horizontal height of the second traction rope, ensuring that the traction rope led out from the higher new beam smoothly passes through the lower old beam body; in summary, the device solves the problem of how to route the two traction systems at the same node, and successfully realizes the synchronous traction of the new beam segments and the old beam segments that are flush with each other; and ensures the smooth and stable traction process; precisely because the new and old beam segments both adopt continuous traction operations, it replaces the intermittent operation of continuously stacking pads during the old beam pushing, thus significantly improving the work efficiency, shortening the working hours, and effectively ensuring the rigid requirement of the railway line to resume operation and traffic within 10 hours.

[0018] In addition, when building a new beam segment outside the railway, since it is necessary to first set up supports for constructing the outer contour of the new beam, etc., sufficient operating and building space needs to be reserved. A sufficient safety distance such as 30 meters needs to be left between the new beam and the railway. Therefore, the initial position of the new beam is far from the railway, and the distance that the new beam needs to be towed is large. While for the old beam, it only needs to be towed out of the railway area by about 10 meters. After meeting the safety distance, it can be disassembled and lifted away. So the distance that the old beam needs to be towed is small. The towing ropes of the two towing systems in this application are staggered by a sufficient distance, without interfering with each other or affecting each other. Therefore, it is completely possible to shut down the first towing system while the second towing system continues to operate normally, which meets the different towing distance requirements of the new beam and the old beam.

[0019] Furthermore, the design of the bottom steel truss in this application is also quite ingenious. The installation process of the bottom steel truss is convenient and reasonable. There is no need to lift the old beam body significantly. It only needs to be lifted to a height slightly higher than the bottom steel truss, and then the bottom steel truss can be passed through the old beam body from below. Then, tripods can be quickly bolted to the protruding parts on both sides of it, and the vertical abutting plates of the two tripods are used to abut and clamp the old beam segment to make it horizontally fixed. Therefore, the assembly is convenient. And the connection effect is also firm and reliable. The first slider is firmly connected by a dense vertical fence, and the tripod is firmly connected by post-inserted bars. That is, the connections between the tripod and the old beam body, the tripod and the bottom steel truss, and the bottom steel truss and the first slider are all firm and reliable. It solves the problem in the prior art that it is difficult to fix a metal slider on the bottom surface of the old beam segment of a heavy and huge reinforced concrete structure.

[0020] Moreover, the fixation of the bottom steel truss also provides a connection structure and position for the fixation of the front steel frame and the rear steel frame, solves the problem that it is difficult to firmly fix the steel frame to the old concrete beam body, makes the assembly method of the two steel frames fast and firm, and ensures that each gear train of the towing system on the two steel frames is firmly fixed.

[0021] The towing device is preferably such that the old beam body is composed of multiple old beam segments arranged in sequence, and the new beam body is composed of multiple new beam segments arranged in sequence. At least one set of preloading components is provided between every two adjacent beam segments. Each set of preloading components includes an installation beam and a pressure-bearing groove steel beam. The two ends of the installation beam are respectively connected to the two sides of one of the adjacent two beam segments, and the two ends of the pressure-bearing groove steel beam of the same group are respectively connected to the two sides of the other beam segment. A row of multiple micro-jacks is fixed on the installation beam, and the piston of each micro-jack abuts against the notch of the pressure-bearing groove steel beam of the same group. A pressure sensor is provided on the piston of each micro-jack. A first hydraulic station for driving the micro-jacks is provided at the end of each old beam segment, and a second hydraulic station for driving the micro-jacks is provided at the end of each new beam segment.

[0022] The towing method is preferably as follows.

[0023] From the overall level of the new beam body and the old beam body, the overall synchronous traction of all the new beam segments of the new beam body is carried out at one time, and the overall synchronous traction of all the old beam segments of the old beam body is also carried out at one time;

[0024] Before the overall traction, all the micro-jacks of the preloading components between every two adjacent beam segments are started, so that the pistons of the above micro-jacks are tightly pressed against the notches of the bearing groove steel beams of the same group, and it is determined that the pressure values of all the piston of the micro-jacks of the same group of preloading components are the same, so as to ensure that the distances of each point on the end faces of two adjacent beam segments are unified; during the overall movement of the new beam body and the old beam body, the pressure values of all the pistons of each group of preloading components are monitored in real time, and each micro-jack is adjusted with more retraction and less compensation to ensure that the pressure values of all the pistons of the same group of micro-jacks remain dynamically balanced during the traction process.

[0025] The advantages of the above preferred structure and method are as follows.

[0026] This solution uses the magnitude of the pressure value to mark the distance and movement trend of each point on the end face of the adjacent beam segments, that is, when the pressure value increases, it means that the distance of this point tends to approach, and when the pressure value decreases, the distance of this point tends to move away; and prestress is applied to correct each point in advance. When the adjacent two beam segments have not had time to displace and only have a tendency to displace, the corresponding micro-jack is jacked out or retracted, and more retraction and less compensation are used to eliminate the movement trend of each point of the adjacent beam segments in advance; to ensure that when the beam segments of the new beam body and the old beam body move in batches as a whole, the adjacent beam segments remain relatively stationary, and all the beam segments of the new beam and the old beam move synchronously and stably in the correct posture, with strong integrity and coordination. Thus, it successfully solves the technical bottleneck of the batch and stable traction of all the beam segments of the beam body that the prior art desires but cannot solve, greatly improves the work efficiency, and significantly shortens the construction period.

[0027] Moreover, this solution solves the technical problem of how to batch, quickly, accurately and conveniently install multiple micro-jacks in a narrow gap of less than 10 cm between adjacent beam segments; specifically, since each micro-jack of the same group is prefabricated on the installation beam in advance, in this way, during assembly, the bearing groove steel beam of the same group can be buckled with the installation beam, the piston of each micro-jack can be clamped by the notch of the bearing groove steel beam, and the buckled bearing groove steel beam, installation beam and a row of micro-jacks can be integrally transported into the gap between adjacent beam segments, and the protruding parts at both ends of the installation beam and the bearing groove steel beam can be quickly connected to the two sides of the beam segment where they are located; so the installation process is convenient, the batch installation speed is fast, it will not significantly occupy the 10-hour railway line restoration and operation time limit, the installation firmness effect is good, and the installation positions of each micro-jack are accurate.

[0028] For further optimization of the preloading assembly, two sets of upper and lower preloading assemblies are provided between every two adjacent beam segments; connecting plates are welded to both ends of each installation beam and both ends of each bearing groove steel beam; the four connecting plates of the upper preloading assembly are respectively connected to the side protection plates of two adjacent beam segments in the front and back; the four connecting plates of the lower preloading assembly are respectively connected to the side webs of two adjacent beam segments in the front and back; in this way, two rows of micro-jack are provided between every two adjacent beam segments, which can adjust the distances and tensions of each point on the end faces of two adjacent beam bodies more comprehensively and evenly, and further ensure the integrity, coordination and stability during traction; moreover, the upper preloading assembly is fixed to the side protection plate on the upper part of the beam body, and the lower preloading assembly is fixed to the side web on the lower part of the beam body, adapting to local conditions and being firmly and conveniently connected. Moreover, the overall traction can also solve the problem of inconsistent lengths of the new beam segment and the old beam segment, because after every two adjacent beam segments are preloaded and abutted against each other, they can be understood as an integral beam body and are pulled by the overall traction, so the concept of each beam segment is weakened.

[0029] The traction device is further preferably that the second hydraulic station is fixed on the top surface of the new beam segment; a slideway extending along the railway width is fixed at the end of the top surface of the old beam segment, a counterweight chassis is fixed at the lower part of the first hydraulic station, the counterweight chassis is slidably fitted on the slideway through a third slider, and a jacking jack is fixed to the top surface of the old beam segment through a third reaction frame, and the piston of the jacking jack is connected to the counterweight chassis.

[0030] The further optimization of the traction method is as follows. When the old beam segment and the new beam segment flush with it are synchronously tractioned, the first hydraulic station and the counterweight chassis are located at the rear end of the slideway on the top surface of the old beam segment. When the first traction jack is closed after the old beam segment is tractioned in place, the jacking jack is driven to push the first hydraulic station and the counterweight chassis to the front end of the slideway.

[0031] The advantages of the above further optimized structure and method are as follows.

[0032] Since two sets of traction systems are attached to the old beam simultaneously, the stress situation is relatively complex. That is, when the second traction rope is tensioned by the upper and lower reversing pulleys, the reaction forces on the two tensioning pulleys will generate torque, and the first anchor head of the first traction rope pulling the front section of the steel frame will also generate torque. The superposition of these two torques will cause the old beam section to have an overall tendency to tip forward. Therefore, when the two traction ropes are dragging synchronously, the first hydraulic station and the counterweight chassis are located at the rear limit position of the slideway, forming a relatively large counterweight torque to resist the overall tendency to tip forward. When the first traction-type jack stops after the old beam is towed in place, the torque of the first traction rope disappears, and the overall tendency to tip forward becomes weaker. Therefore, the jack for pushing the counterweight is driven forward to shorten the lever arm and thus reduce the counterweight torque, restoring the torque balance in the state of single-rope traction. Moreover, in order to drive a row of multiple micro-jacks, the first hydraulic station already has a relatively large self-weight, and this part of the self-weight constitutes the main counterweight to resist tipping. And the jack for pushing this counterweight can also be driven by the existing first hydraulic station. Even if the specification and weight of the first hydraulic station are further increased to drive this jack, the increased weight can just be effectively utilized as part of the counterweight. Therefore, the above-mentioned structures such as the hydraulic station, counterweight, and counterweight drive system rely on each other, combine with each other, and enhance each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of the traction device using the present invention.

[0034] Figure 2 is Figure 1 an enlarged structural diagram of part A in

[0035] Figure 3 is Figure 1 an enlarged structural diagram of part B in

[0036] Figure 4 is Figure 1 a schematic structural diagram after deflecting a certain angle.

[0037] Figure 5 is Figure 4 an enlarged structural diagram of part C in

[0038] Figure 6 is Figure 4 an enlarged structural diagram of part D in

[0039] Figure 7 is a front view structural diagram of a single node of the traction device of the present invention.

[0040] Figure 8 is a schematic structural diagram of the preloading assembly between two new beam sections of the traction device of the present invention.

[0041] Figure 9Schematic diagram of the front beam section of the preloading assembly for the traction device of the present invention.

[0042] Figure 10 Schematic diagram of the rear beam section of the preloading assembly for the traction device of the present invention.

[0043] As shown in the figure, 1 is the base plate, 2 is the slide rail, 3 is the old beam section, 4 is the first slider, 5 is the new beam section, 6 is the second slider, 7 is the first reaction frame, 8 is the first traction type jack, 9 is the first traction rope, 10 is the front steel truss, 11 is the rear steel truss, 12 is the lower tension pulley, 13 is the first anchor head, 14 is the bottom steel truss, 15 is the vertical fence, 16 is the triangular frame, 17 is the steel inclined brace, 18 is the second reaction frame, 19 is the second traction type jack, 20 is the second traction rope, 21 is the upper tension pulley, 22 is the upper reversing pulley, 23 is the lower reversing pulley, 24 is the front leveling truss, 25 is the rear leveling truss, 26 is the rear tension pulley, 27 is the second anchor head, 28 is the installation beam, 29 is the pressure-bearing groove steel beam, 30 is the micro jack, 31 is the first hydraulic station, 32 is the slideway, 33 is the third reaction frame, 34 is the jacking type jack, 35 is the counterweight chassis, 36 is the third slider, 37 is the second hydraulic station, 38 is the connecting plate, 39 is the side protection plate, 40 is the side web. Detailed implementation manners

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] As Figures 1 to 10 shown, the overall synchronous lateral traction device for replacing old railway bridges with new ones of the present invention includes multiple base plates 1 extending horizontally, that is, along the width direction of the railway. The above-mentioned base plates 1 are fixed on the respective horizontal main beams of the sliding support. One horizontal slide rail 2 is fixed on each base plate 1.

[0046] The old beam body, that is, the simply supported reinforced concrete T-beam, is composed of a series of multiple old beam sections 3 arranged in sequence. Each old beam section 3 is slidably engaged with the corresponding slide rail 2 through the first slider 4. Specifically, a row of four first sliders 4 is provided below the end of each old beam section 3. The new beam body, that is, the continuous steel box girder of the turnout, is composed of a series of multiple new beam sections 5 arranged in sequence. Each new beam section 5 is slidably engaged with the corresponding slide rail 2 through the second slider 6. Specifically, a row of 2-4 second sliders 6 is provided below the end of each new beam section 5. The second slider 6 is higher than the first slider 4.

[0047] The first traction system and the second traction system are provided at each node of the old beam body and the new beam body. The so-called node refers to the cross-section at regular intervals along the length direction of the railway, generally at both ends of each new beam section 5 of the new beam body and both ends of each old beam section 3 of the old beam body.

[0048] Each first traction system includes a first reaction frame 7 fixed on the base plate 1 at the rear end of the slide rail 2, a first traction jack 8 fixed on the first reaction frame 7, a first traction rope 9, a front steel frame 10 and a rear steel frame 11 fixed on both sides of the old beam section 3. A lower tension pulley 12 is provided at the lower part of the rear steel frame 11; the front end of the first traction rope 9 passes through the first anchor hole at the lower part of the front steel frame 10 and the front end of the first traction rope 9 is clamped to the front opening of the first anchor hole by a first anchor head 13; the middle section of the first traction rope 9 is tightened by the lower tension pulley 12 and finally connected to the first traction jack 8.

[0049] The first traction system further includes a bottom steel truss 14 located below the old beam body; the bottom steel truss 14 extends horizontally, that is, along the width of the railway, and encloses a corresponding row of 4 first sliders 4, and dense vertical fences 15 are provided at positions close to each first slider 4, and the vertical fences 15 are welded to the adjacent first sliders 4. The front and rear ends of the bottom steel truss 14 protrude from both sides of the old beam body, and triangular frames 16 are connected to the top surfaces of the protruding parts at the front and rear ends of the bottom steel truss 14, such as by screwing. The vertical resisting plates of each triangular frame 16 are connected to the corresponding side webs 40 of the old beam body through implanted screw bars. The front steel frame 10 and the rear steel frame 11 are respectively welded to the side surfaces of the front and rear protruding parts of the bottom steel truss 14, and steel inclined braces 17 are additionally welded between the front steel frame 10 or the rear steel frame 11 and the corresponding protruding part side surfaces.

[0050] Each second traction system includes a second reaction frame 18 fixed on the base plate 1 at the rear end of the slide rail 2, a second traction jack 19 fixed on the second reaction frame 18, a second traction rope 20, an upper tension pulley 21 installed on the upper part of the rear steel frame 11, an upper reversing pulley 22, a lower reversing pulley 23 installed on the upper part of the front steel frame 10, and a front leveling truss 24 and a rear leveling truss 25 fixed on both sides of the new beam section 5. A rear tension pulley 26 is provided on the rear leveling truss 25; the front end of the second traction rope 20 passes through the second anchor hole of the front leveling truss 24 and the front end of the second traction rope 20 is clamped to the front opening of the second anchor hole by a second anchor head 27. The middle section of the second traction rope 20 is tightened by the rear tension pulley 26 in sequence, then reversed by the upper reversing pulley 22 and the lower reversing pulley 23, and then tightened by the upper tension pulley 21 and finally connected to the second traction jack 19. Since the second traction jack 19 and the second reaction frame 18 are higher than the first traction jack 8 and the first reaction frame 7, and the first traction jack 8 is at the rear, in order to avoid blocking, a through hole is provided in the second reaction frame 18 to allow the first traction rope 9 to pass through.

[0051] Between every two adjacent beam segments, such as between every two adjacent new beam segments 5 or between every two adjacent old beam segments 3, there is at least one set of preloading components. Each set of preloading components includes an installation beam 28 and a bearing groove steel beam 29; both ends of the installation beam 28 are respectively connected to both sides of one of the adjacent two beam segments, and both ends of the bearing groove steel beam 29 of the same group are respectively connected to both sides of the other of the adjacent two beam segments. A row of multiple, such as 4, micro-jacks 30 is fixed on the installation beam 28, and the piston of each micro-jack 30 abuts against the notch of the bearing groove steel beam 29 of the same group. The term "micro" refers to a type smaller than a normal jack, with a length of about 7 cm and not exceeding 10 cm to adapt to the gap between adjacent beam segments. A pressure sensor is provided at the end of the piston of each micro-jack 30.

[0052] At the end of each old beam segment 3, there is a first hydraulic station 31 for driving the corresponding micro-jack 30. Specifically, a slideway 32 extending along the width of the railway is fixed at the end of the top surface of the old beam segment 3. A counterweight chassis 35 is fixed at the lower part of the first hydraulic station 31, and the counterweight chassis 35 is slidably fitted on the slideway 32 through a third slider 36. A pushing jack 34 is fixed on the top surface of the old beam segment 3 through a third reaction frame 33, and the piston of the pushing jack 34 is connected to the counterweight chassis 35. The pushing direction of the pushing jack 34 is also transverse, that is, along the width of the railway.

[0053] At the end of each new beam segment 5, there is a second hydraulic station 37 for driving the corresponding micro-jack 30, and the second hydraulic station 37 is fixed on the top surface of the corresponding new beam segment 5.

[0054] Preferably, there are upper and lower two sets of preloading components between every two adjacent beam segments in this embodiment. Connecting plates 38 are welded at both ends of each installation beam 28 and both ends of each bearing groove steel beam 29; in this way, there are a total of four connecting plates 38 at the four ends of the two beams, namely the installation beam 28 and the bearing groove steel beam 29, of each set of preloading components. The four connecting plates 38 of the upper preloading component are respectively connected to the two side protection plates 39 of the front-side beam segment and the two side protection plates 39 of the rear-side beam segment; the four connecting plates 38 of the lower preloading component are respectively connected to the two side webs 40 of the front-side beam segment and the two side webs 40 of the rear-side beam segment. For the new steel beam body, screws can be directly welded to screw the connecting plates 38, while for the old concrete beam segment 3, spiral bars are implanted to screw the connecting plates 38.

[0055] Of course, as is known by common sense, the device is also provided with a main controller such as a PCB circuit board, and all the above-mentioned pressure sensors, all traction jacks, micro-jacks 30, and pushing jacks 34 are signal-connected to the main controller.

[0056] As Figures 1 to 10 shown, based on the traction method of the overall synchronous lateral traction device for replacing old railway bridges with new ones according to the present invention, the steps are as follows.

[0057] First, set up the sliding support, that is, drive piles from bottom to top according to the same steps as the prior art, pour the concrete pile cap, set up the columns, fix the longitudinal main beams at the top of the columns, and place and fix the transverse main beams on each longitudinal main beam; and lay the foundation plate 1 and the slide rail 2 across the railway on each transverse main beam of the sliding support.

[0058] Build each new beam segment 5 for assembling the new beam body outside the railway range on the front side of the slide rail 2, and use the second slider 6 fixed at the bottom of the new beam segment 5 to slidably fit each new beam segment 5 on the corresponding slide rail 2. Use the jacking jacks installed on each pier of the old beam body to jack up each old beam segment 3 of the old beam body, snap the first slider 4 of each bottom steel truss 14 into the corresponding slide rail 2 and push each bottom steel truss 14 to the lower side of the corresponding old beam segment 3, and then lower the jacking jacks to lower each old beam segment 3 onto the corresponding bottom steel truss 14; then use the tripod 16 to fix the web of each old beam segment 3 to the protruding part of the corresponding bottom steel truss 14, that is, screw or weld the bottom plate of the tripod 16 to the protruding part of the bottom steel truss 14, and screw the vertical resisting plate of the tripod 16 to the corresponding side web 40 of the old beam segment 3 through the implanted screw bars.

[0059] Then, arrange the first traction system and the second traction system at each node of the old beam body and the new beam body.

[0060] At this time, the preliminary preparation work is completed and the core traction step is entered.

[0061] Viewed separately from the level of each beam segment, synchronously start the corresponding first traction jack 8 and the second traction jack 19, and synchronously horizontally traction an old beam segment 3 and the new beam segment 5 flush with it until the old beam segment 3 is pulled out of the safe range of the railway, such as a distance outside the railway, such as 10 meters, then turn off the first traction jack 8 and continue to drive the second traction jack 19, and continue to traction the new beam segment 5 until the new beam segment 5 reaches the railway center line position.

[0062] When the old beam segment 3 and the new beam segment 5 flush with it are synchronously tractioned, the first hydraulic station 31 and the counterweight chassis 35 are located at the rear end of the slideway 32 on the top surface of the old beam segment 3. When the old beam segment 3 is tractioned in place and the first traction jack 8 is turned off, drive the jacking jack 34 to push the first hydraulic station 31 and the counterweight chassis 35 to the front end of the slideway 32.

[0063] Viewed from the overall level of the new beam body and the old beam body, the entire new beam segments 5 of the new beam body can be integrally and synchronously tractioned at one time, and the entire old beam segments 3 of the old beam body can also be integrally and synchronously tractioned at one time.

[0064] Before the overall traction, start all the micro-jacks 30 of the preloading assembly between every two adjacent beam segments, so that the pistons of the above-mentioned micro-jacks 30 abut against the notches of the pressure-bearing groove steel beams 29 of the same group, and determine that the pressure values of the pistons of all the micro-jacks 30 of the same group of preloading assemblies, that is, the prestresses, are the same, so as to ensure the uniformity of the spacing and movement trends of each point on the end faces of two adjacent beam segments. During the overall movement of the new beam body and the old beam body, the pressure values of the pistons of all the micro-jacks 30 of each group of preloading assemblies at each moment are monitored in real time, and are timely fed back to the main controller, and the main controller makes up for the over-retraction and under-retraction of each micro-jack 30. For example, if the pre-applied pressure value of the system is 100 kg, during the traction process, if the pressure value of micro-jack 30 a drops to 95 kg, then the piston rod of this micro-jack 30 is pushed outwards; if it rises to 110 kg, then the piston rod of this micro-jack 30 is retracted. Thus, it is ensured that the pressure values of the pistons of all the micro-jacks 30 of the same group remain dynamically balanced during the traction process, and further ensure that each point on the end faces of every two adjacent beam segments remains relatively stationary during the movement process.

[0065] "Overall synchronization" in the name of this application means that all the new beam segments of the new beam body and all the old beam segments of the old beam body are synchronously pulled into place at one time.

Claims

1. An overall synchronous lateral traction device for replacing old railway bridges with new ones, which comprises a plurality of laterally extending base plates, and slide rails are fixed on each base plate; the old beam body is slidably matched with the corresponding slide rail through a first slider, and the new beam body is slidably matched with the corresponding slide rail through a second slider; a first reaction frame is fixed on the base plate at the rear end of the slide rail, and a first traction jack is installed on the first reaction frame, and the characteristics are as follows: The second slider is higher than the first slider; the first traction system and the second traction system are provided at each node of the old beam body and the new beam body; the first traction system includes a first traction rope, a front steel truss and a rear steel truss fixed on both sides of the old beam body; a lower tension pulley is provided at the lower part of the rear steel truss; the front end of the first traction rope passes through the first anchor hole at the lower part of the front steel truss and the front end of the first traction rope is clamped by a first anchor head at the front opening of the first anchor hole; the middle section of the first traction rope is tensioned by the lower tension pulley and connected to the first traction jack; the second traction system includes a second reaction frame fixed on the base plate at the rear end of the slide rail, a second traction jack fixed on the second reaction frame, a second traction rope, an upper tension pulley installed on the upper part of the rear steel truss, two upper and lower reversing pulleys installed on the upper part of the front steel truss, and a front leveling truss and a rear leveling truss fixed on both sides of the new beam body, and a rear tension pulley is provided on the rear leveling truss; the front end of the second traction rope passes through the second anchor hole of the front leveling truss and the front end of the second traction rope is clamped by a second anchor head at the front opening of the second anchor hole, the middle section of the second traction rope is tensioned by the rear tension pulley in sequence, then is reversed by the upper reversing pulley and the lower reversing pulley, and then is tensioned by the upper tension pulley and connected to the second traction jack; The first traction system further includes a bottom steel truss located below the old beam body; the bottom steel truss extends horizontally and sleeves the corresponding first sliders, and dense vertical fences are provided at positions close to each first slider, and the vertical fences are welded to the adjacent first sliders; the front and rear ends of the bottom steel truss protrude from both sides of the old beam body, and triangular frames are connected to the top surfaces of the protruding parts at both ends of the bottom steel truss, and the vertical resisting plates of each triangular frame are connected to the corresponding side webs of the old beam body through implanted screw bars; the front steel truss and the rear steel truss are respectively welded to the side surfaces of the front and rear protruding parts of the bottom steel truss.

2. The overall synchronous lateral traction device for replacing old railway bridges with new ones according to claim 1, characterized in that: The old beam body is formed by arranging multiple old beam segments in sequence, and the new beam body is formed by arranging multiple new beam segments in sequence; at least one set of preloading components is provided between every two adjacent beam segments, and each set of preloading components includes an installation beam and a bearing groove steel beam; both ends of the installation beam are respectively connected to both sides of one of the adjacent two beam segments, and both ends of the bearing groove steel beam of the same group are respectively connected to both sides of the other beam segment; a row of multiple micro jacks are fixed on the installation beam, the piston of each micro jack abuts against the notch of the bearing groove steel beam of the same group, and a pressure sensor is provided on the piston of each micro jack; a first hydraulic station for driving the micro jacks is provided at the end of each old beam segment, and a second hydraulic station for driving the micro jacks is provided at the end of each new beam segment.

3. The overall synchronous lateral traction device for replacing the old railway bridge with a new one according to claim 2, characterized in that: Two sets of upper and lower preloading components are provided between every two adjacent beam segments; connecting plates are welded at both ends of each installation beam and both ends of each bearing groove steel beam; the four connecting plates of the upper preloading component are respectively connected to the side guard plates of the front and rear adjacent beam segments; the four connecting plates of the lower preloading component are respectively connected to the side webs of the front and rear adjacent beam segments.

4. The overall synchronous lateral traction device for replacing old railway bridges with new ones according to claim 2, wherein: The second hydraulic station is fixed on the top surface of the new beam segment; at the end of the top surface of the old beam segment, a slideway extending along the railway width is fixed. The lower part of the first hydraulic station is fixed with a counterweight chassis, and the counterweight chassis is slidably fitted on the slideway through a third slider. The top surface of the old beam segment is fixed with a jacking-type jack through a third reaction frame, and the piston of the jacking-type jack is connected to the counterweight chassis.

5. A traction method for the railway bridge old-for-new overall synchronous lateral traction device according to any one of claims 1 to 4, characterized in that, The steps are as follows: Erect a sliding support and lay railway-crossing slide rails on each transverse main beam of the sliding support; Build each new beam segment for assembling the new beam body outside the railway range in front of the slide rails, and use the second sliders fixed at the bottom of the new beam segments to slidably fit each new beam segment on the corresponding slide rails; use the jacking-type jacks installed on each pier of the old beam body to jack up each old beam segment of the old beam body, insert the first sliders of each bottom steel truss into the corresponding slide rails and push each bottom steel truss under the corresponding old beam segment, then lower the jacking-type jacks to lower each old beam segment, and then fix the webs of each old beam segment to the protruding parts of the corresponding bottom steel trusses with tripods; then arrange the first traction system and the second traction system at each node of the old beam body and the new beam body. Viewed from the level of each beam segment, synchronously start the corresponding first traction-type jacks and second traction-type jacks, and synchronously horizontally traction an old beam segment and the new beam segment flush with it until the old beam segment is pulled out of the safe range of the railway, then turn off the first traction-type jacks and continue to drive the second traction-type jacks, and continue to traction the new beam segment until the new beam segment reaches the railway center line position.

6. The traction method according to claim 5, wherein: Viewed from the overall level of the new beam body and the old beam body, perform an overall synchronous traction on all the new beam segments of the new beam body at one time, and also perform an overall synchronous traction on all the old beam segments of the old beam body at one time; And before the overall traction, start all the micro-jacks of the preloading assemblies between every two adjacent beam segments, make the pistons of the above micro-jacks abut against the notches of the bearing groove steel beams of the same group, and ensure that the pressure values of the pistons of all the micro-jacks of the same group of preloading assemblies are the same, so as to ensure the uniformity of the distances of each point on the end faces of two adjacent beam segments; during the overall movement of the new beam body and the old beam body, real-time monitor the pressure values of the pistons of all the micro-jacks of each group of preloading assemblies, and make up for the retreat and shortage of each micro-jack to ensure that the pressure values of the pistons of all the micro-jacks of the same group remain dynamically balanced during the traction process.

7. The traction method according to claim 5, characterized in that: When the old beam segment and the new beam segment flush with it are synchronously tractioned, the first hydraulic station and the counterweight chassis are located at the rear end of the slideway on the top surface of the old beam segment. When the old beam segment is tractioned in place and the first traction-type jacks are turned off, drive the jacking-type jacks to push the first hydraulic station and the counterweight chassis to the front end of the slideway.

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