Construction method for synchronously erecting each layer beam of three-layer bridge with main line and ramp sharing pier

Abstract

The application discloses a kind of main line and ramp common pier three-layer bridge each layer beam synchronous erecting construction method, first, main line and ramp common pier three-layer bridge complete three-layer bent cap construction once;Second, bridge erecting machine is set on the top main line bridge deck, beam transport vehicle is respectively located in lower layer A ramp, intermediate layer B ramp, upper layer main line, respectively from lower layer, intermediate layer, upper layer and bridge erecting machine cooperate beam transport, realize once erecting lower layer A ramp beam body, intermediate layer B ramp beam body, upper layer main line beam body.The application effectively avoids the mutual restriction of the alternate operation between each layer bent cap of common pier three-layer bridge and each layer beam erection, greatly improves the construction efficiency of common pier three-layer bridge, saves construction period, reduces construction cost, and can provide construction experience for similar projects.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology. More specifically, this invention relates to a method for the simultaneous erection of beams on each level of a three-level bridge with shared piers for the main line and ramps. Background Technology

[0002] With the rapid development of my country's construction industry, bridge structures are becoming increasingly diverse, leading to greater construction challenges, especially in urban transportation projects. To alleviate traffic congestion, elevated expressways are being built, particularly large two- and three-level interchanges at major intersections. As urban bridges face numerous construction interferences, including difficulties in land acquisition and bridge demolition coordination, and tight deadlines. While domestic scholars have conducted some research on multi-layered bridges with shared piers, most studies focus on two-layer structures, with limited research on three-layered bridges with shared piers, particularly regarding construction techniques.

[0003] This application mainly studies the construction technology of synchronous erection of beams in each layer of a three-layer bridge with the main line and ramps sharing piers. The project is a three-layer bridge with the main line and ramps A and B sharing the same piers. The lower layer is ramp A, the middle layer is ramp B, and the upper layer is the main line. Due to the limited inter-layer clearance (minimum 5.5m), the inter-layer clearance does not meet the clearance requirements for the bridge erection machine. Conventional construction requires the completion of the lower layer ramp A cap beam and beam erection before the construction of the middle layer ramp B cap beam and beam erection, and finally the construction of the upper layer main line cap beam and beam erection. If a bridge erection machine is used for beam erection, the construction of the upper layer cap beam and beam erection can only be carried out after the lower layer beams are erected. This method requires the construction of the lower layer ramp A beams after all the lower layer ramp cap beams are completed, followed by the construction of the ramp B cap beams and the construction of the ramp B beams, and finally the construction of the upper layer main line cap beam and beam erection.

[0004] The conventional construction of the three-story bridge substructure and the beam erection are mutually restrictive. Furthermore, the construction of some bridge piers is restricted by land acquisition and demolition, which seriously affects the overall construction progress. At the same time, some bridge piers are limited by site conditions, and there are no conditions for lifting the beams with truck cranes. Moreover, the cost of erecting beams with truck cranes is much higher than that of erecting beams with bridge erection machines. Summary of the Invention

[0005] One objective of this invention is to provide a method for the synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps. This method effectively avoids the mutual constraints between the alternating operations of the cap beams and beam erection at each level of the three-level bridge with shared piers, greatly improves the construction efficiency of the three-level bridge with shared piers, saves the construction period, reduces the construction cost, and can provide construction experience for similar projects.

[0006] To achieve these objectives and other advantages according to the present invention, a method for synchronously erecting beams of each layer of a three-layer bridge with shared piers for the main line and ramps is provided. First, the construction of the three-layer cap beams of the three-layer bridge with shared piers for the main line and ramps is completed in one go. Second, the bridge erecting machine is set on the top of the main line bridge deck, and the beam transport vehicle is located at the lower layer A ramp, the middle layer B ramp, and the upper layer main line respectively, and the beams are transported in coordination with the bridge erecting machine from the lower layer, the middle layer, and the upper layer respectively, so as to realize the simultaneous erection of the beams of the lower layer A ramp, the middle layer B ramp, and the upper layer main line.

[0007] Preferably, the specific steps include the following:

[0008] Step 1: Use a highway beam transport vehicle to transport the beams from the already erected lower level A ramp beams to directly below the bridge erecting machine, and then feed the beams to the designated position on the lower level A ramp bridge deck;

[0009] Step 2: The front end of the bridge girder is lifted by the overhead crane of the bridge erecting machine until it is detached from the girder transport vehicle;

[0010] Step 3: The beam transport vehicle works in conjunction with the overhead crane to move the beam forward to the end of the bridge deck;

[0011] Step 4: After the beam transport vehicle transports the beam to the designated location, the bridge erecting machine connects the beam to the rear trolley, and the rear trolley lifts the beam, simultaneously delivering it to the predetermined beam erection position with the front trolley.

[0012] Step 5: After the beam reaches the predetermined position, adjust the beam end line and support center, lower the beam, and complete the erection of the first beam of the lower level A ramp;

[0013] Step 6: Following steps 1 to 5 above, complete the erection of the remaining beams for the lower level A ramp in sequence;

[0014] Step 7: The beam transport vehicle transports beams on the intermediate level B ramp, and the bridge erecting machine station is located on the main bridge deck. Following steps 1 to 5 above, the beam erection construction of the intermediate level B ramp is completed in sequence.

[0015] Step 8: The beam transport vehicle transports beams on the upper main line, and the bridge erecting machine station is located on the main line bridge deck. Following steps one to five above, the upper main line beam erection construction is completed in sequence.

[0016] Preferably, the beam transport vehicle in steps one and two is an anti-aircraft gun beam transport vehicle, and the beam transport vehicle in steps three to five is a tire-mounted beam transport vehicle. The method for synchronous erection of beams at each layer also includes a beam transport vehicle switching step between steps two and three. Specifically, the overhead crane of the bridge erecting machine lifts the rear end of the beam from the beam joint of the main bridge deck until it is separated from the anti-aircraft gun beam transport vehicle, drives away the anti-aircraft gun beam transport vehicle, switches to the tire-mounted beam transport vehicle, and lowers the rear end of the beam onto the tire-mounted beam transport vehicle. Then, the connection between the overhead crane and the beam is released.

[0017] Preferably, when the beam is too long and the rear crane of the bridge erecting machine does not have the conditions for hooking, the beam is moved to the rear crane's lifting point by the high-pressure beam transport vehicle in coordination with the front crane, so that the beam can be hooked and lowered into the rear lifting point, and the beam transport vehicle switching steps can continue.

[0018] Preferably, in step one, after the beam is fed to the designated position, the overhang length of the front end of the beam is not less than 5m. If it does not meet the design requirements, the front end of the beam is lifted by the overhead crane of the bridge erecting machine during beam feeding and adjusted to meet the design requirements.

[0019] Preferably, two stiffening plates are symmetrically arranged below the winch pulley blocks on both the front and rear overhead cranes. The spreader bar pin is extended and passes through the stiffening plates, with a lifting beam wire rope suspended on each side of the extended spreader bar pin. Two binding wire ropes are correspondingly arranged at the front and rear ends of the beam, connected to the two lifting beam wire ropes via shackles. The lower end of the binding wire rope is a loop and fitted onto the beam. The upper part of the binding wire rope connecting to the lifting beam wire rope is a connecting part. The loop part of the binding wire rope and the connecting part are connected by a connector, which is formed by a pair of connecting plates hinged at the top. The connecting part of the binding wire rope is connected to the top of the connector, and the loop part is connected to the two ends of the connector to form a complete loop.

[0020] Preferably, in step four, the front crane and the rear crane move the beam to the predetermined position in steps, stopping and stabilizing the beam for the first time at 1.5m from the predetermined position; and stopping and stabilizing the beam for the second time at 0.5m from the predetermined position.

[0021] Preferably, in step one, after feeding the beam to the designated position, triangular sleepers are placed at a set distance from the front end of the installed beam to prevent the beam transport vehicle from slipping. In the beam transport vehicle switching step, triangular sleepers are placed at the wheels of the tire beam transport vehicle to prevent the tire beam transport vehicle from slipping.

[0022] Preferably, the connection points between the rear and front cranes and the beam are set according to the predetermined positions to ensure that the wire ropes do not interfere with the cap beam when the front and rear cranes lift the beam.

[0023] Preferably, during bridge girder erection, the existing road is partially closed, and each section of the road can only be constructed with half of the road closed at a time to ensure the safety of vehicles passing underneath and the safety of construction during the bridge girder erection process.

[0024] The present invention has at least the following beneficial effects:

[0025] 1. This invention optimizes the construction scheme of the three-layer bridge substructure and girder erection into a one-time completion of the three-layer cap beam construction, followed by the simultaneous erection of the lower layer A ramp beam, the middle layer B ramp beam, and the upper layer main line beam. The simultaneous erection of beams at the lower, middle, and upper layers of the shared pier greatly improves the rationality of the connection between the substructure and girder erection construction procedures, shortens the overall construction period by about 6 months, and reduces the construction cost by about 4.92 million yuan.

[0026] 2. This invention addresses the actual construction environment by switching the beam transport vehicle during the erection process, thereby achieving a more convenient and efficient beam erection operation.

[0027] 3. This invention addresses the issue of the high beam erection process of the lower-level A ramp by improving and optimizing the connecting steel wire ropes and corresponding structures to ensure that the conventional bridge erecting machine steel wire ropes meet the requirements for beam erection construction.

[0028] 4. The present invention rationally designs and calculates the beam binding position of the binding steel wire rope so that the steel wire rope does not conflict with the cap beam when lifting the beam at the front and rear lifting points, provided that the load-bearing conditions are met.

[0029] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0030] Figure 1 This is a standard cross-sectional view of the three-story bridge with shared piers for the main line and ramps in this invention.

[0031] Figure 2 This is a schematic diagram of the beam transport vehicle feeding beams in the lower A ramp of the present invention;

[0032] Figure 3 This is a schematic diagram of the overhead crane beam of the lower level A ramp of the present invention;

[0033] Figure 4 This is a schematic diagram of the beam-transfer vehicle for the lower level A ramp of the present invention. Figure 1 ;

[0034] Figure 5 This is a schematic diagram of the beam-transfer vehicle for the lower level A ramp of the present invention. Figure 2 ;

[0035] Figure 6 This is a schematic diagram of the beam-transfer vehicle for the lower level A ramp of the present invention. Figure 3 ;

[0036] Figure 7 This is a schematic diagram of the beam-transfer vehicle for the lower level A ramp of the present invention. Figure 4 ;

[0037] Figure 8 This is a schematic diagram of the lifting point after the rear crane is released from the lower level A ramp of the present invention;

[0038] Figure 9 This is a schematic diagram of the cooperation between the overhead crane and the beam transport vehicle in delivering beams on the lower level A ramp of the present invention;

[0039] Figure 10 This is a schematic diagram of the synchronous beam delivery by the front and rear overhead cranes of the lower A ramp of the present invention;

[0040] Figure 11 This is a schematic diagram showing the completion of the erection of the first beam of the lower-level A ramp of the present invention;

[0041] Figure 12 This is a schematic diagram of the steel wire rope and lifting device for the upper lifting beam of the present invention;

[0042] Figure 13 This is a schematic diagram of the lower binding wire rope and lifting device of the present invention;

[0043] Figure 14 This is a schematic diagram showing the location of the suspension points for the binding wire rope in this invention. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0045] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] like Figure 1 As shown, this invention provides a method for the simultaneous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps. First, the three-level cap beams of the three-level bridge with shared piers for the main line and ramps are constructed in one go. Second, the bridge erecting machine is set up on the top of the main line bridge deck. When the beam transport vehicle is located at the lower level A ramp 1, the middle level B ramp 2, and the upper level main line 3, it cooperates with the bridge erecting machine to transport beams from the lower level, the middle level, and the upper level, respectively, so as to achieve the simultaneous erection of the beams of the lower level A ramp, the middle level B ramp, and the upper level main line.

[0047] The construction scheme for the substructure and girder erection of a three-level bridge with shared piers (upper main line, middle ramp B, and lower ramp A) was studied and optimized. This enabled the simultaneous construction of all three levels of cap beams on the shared pier bridge. Subsequently, a bridge erection machine station was located on the main line bridge deck, and girder transport vehicles transported beams from the lower, middle, and upper levels respectively, erecting the lower ramp A beam, the middle ramp B beam, and the upper main line beam in one go. The simultaneous erection of beams at the lower, middle, and upper levels of the shared piers significantly improved the rationality of the substructure and girder erection construction process, shortened the overall construction period, and reduced construction costs. Example

[0048] A method for synchronously erecting beams at each level of a three-level bridge with shared piers for the main line and ramps, the main process flow of which is as follows:

[0049] ① Use a highway beam transport vehicle to transport beams and feed them to the lower level A ramp bridge deck → ② The front crane lifts the beam → ③ The rear crane lifts the beam and switches to the beam transport vehicle → ④ The front crane and beam transport vehicle work together to deliver the beam → ⑤ The rear crane hangs the beam, and the front and rear cranes deliver the beam simultaneously → ⑥ The beam is lowered into place, completing the erection of the first beam of the A ramp → ⑦ The remaining beams of the lower level A ramp are erected in sequence → ⑧ The beam transport vehicle transports beams on the intermediate level B ramp, and the bridge erecting machine station is located on the main line bridge deck, completing the beam erection construction of the intermediate level B ramp in sequence → ⑨ The beam transport vehicle transports beams on the upper level main line, and the bridge erecting machine station is located on the main line bridge deck, completing the beam erection construction of the upper level main line in sequence.

[0050] The specific construction steps and diagrams are as follows:

[0051] ① Use a highway beam transport vehicle to transport the beams and feed them to the lower level A ramp bridge deck.

[0052] like Figure 2 As shown, a highway beam transport vehicle 4 transports beam 7 to the position of ramp A directly below the bridge erecting machine 5. Upon arrival at the designated position, binding steel wire ropes are installed, with the rope ends hanging on the beam surface. A secondary cannon with power, capable of self-propelled movement without load, is required. If the beam end overhang length during highway transport does not meet the requirements for hanging the beam at the front of the bridge erecting machine, a crane must be used to lift the front end of the beam during beam feeding by the transport vehicle, adjusting the beam end overhang length to 5m. Triangular sleepers are placed 1.5m away from the end of the already erected beam segment 6 to prevent the transport vehicle from slipping.

[0053] ②The day before yesterday, the crane lifted the beam.

[0054] like Figure 3 As shown, after the beam transport vehicle 4 reverses to the designated position, the front lifting beam wire rope 8 is lowered, and the lifting beam wire rope 8 is connected to the binding wire rope 9 using a shackle. The front crane 10 lifts the beam body 7 until it is detached from the beam transport auxiliary vehicle, and the power-driven beam transport auxiliary vehicle moves to the beam transport main vehicle.

[0055] The bridge erecting machine station is located on the upper main line to erect the beams of the lower A and B ramps (the beam transport vehicle transports beams from the lower A ramp and the middle B ramp respectively). Compared with ordinary bridge erection, the wire rope of the winch of the ordinary bridge erecting machine is not long enough to erect the beam of the lower A ramp, so the wire rope must be extended.

[0056] Since the rear lifting point needs to be lowered through the gaps in the already erected beams, it needs to be modified based on conventional lifting equipment. The front lifting point adopts the same design as the rear lifting point.

[0057] Design of the upper lifting beam wire rope 8 and lifting equipment at the front and rear lifting points: To ensure that the rear lifting beam wire rope 8 can be lowered from the gap between the erected beams (gap width 60cm~120cm), a simple modification needs to be made to the conventional bridge erecting machine winch and spreader pole. The specific modification method is as follows: two stiffening plates 13 are symmetrically installed below the winch pulley blocks 12 on the front crane 10 and the rear crane 11, and the spreader pole pin 14 is lengthened and passed through the stiffening plates. A lifting beam wire rope 8 with a diameter of φ76mm is suspended on each side of the extended spreader pole pin, on both the large and small mileage sides. Figure 12 As shown.

[0058] The design includes the lower binding wire ropes 9 at the front and rear lifting points and the lifting gear. (For example...) Figure 13 As shown, two binding steel wire ropes 9 are respectively installed at the front and rear ends of the beam, which are connected to the two lifting beam steel wire ropes 8 by shackles. The lower end of the binding steel wire rope 9 is a loop and is sleeved on the beam 7. The upper part of the binding steel wire rope connecting the lifting beam steel wire rope is a connecting part. The loop part of the binding steel wire rope and the connecting part are connected by a connector 15. The connector is formed by a pair of connecting plates hinged at the top. The connecting part of the binding steel wire rope is connected to the top of the connector, and the loop part is connected to the two ends of the connector to form a complete loop.

[0059] ③The day after tomorrow, the crane will be used to transport the beams.

[0060] Because the beam fabrication plant is far from the construction site, a high-pressure beam transport vehicle 4 is used to transport beams to the site via public roads. Then, it is converted into a low-pressure tire beam transport vehicle 16 to cooperate with the front lifting point of the bridge erecting machine for beam erection.

[0061] like Figure 4 As shown, the 11th vehicle lowers the lifting steel wire rope 8 from the joint of the main bridge deck beams, installs the binding steel wire rope 9, lifts the rear end of the beam, and the powered tire-mounted beam transport vehicle moves forward to the main beam transport vehicle of the anti-aircraft gun. At the same time, triangular sleepers are placed at the rear wheels of the vehicle to prevent the beam transport vehicle from slipping. Figure 5 As shown, the crane 11 slowly lowers the hoisted beam, placing the rear end of the beam onto the tire-mounted beam transport vehicle 16.

[0062] When the length of beam 7 is relatively long, such as Figure 3 Compared to Figure 2The beam shown indicates that when the rear crane of the bridge erecting machine lacks the conditions for hooking, the beam is moved to the lifting point of the rear crane by a high-pressure beam transport vehicle in coordination with the front crane, thus enabling hooking. Figure 6 As shown, it then falls into the rear lifting point, and continues to ③ to complete the girder transport vehicle switching, as shown. Figure 7 As shown.

[0063] ④ The day before yesterday, the truck and the beam transport truck worked together to deliver the beam.

[0064] like Figure 8 As shown, after loosening the connection between the overhead crane beam wire rope and the binding wire rope, the binding wire rope and shackles remain on the beam surface. Figure 9 As shown, the beam transport vehicle works in conjunction with the front crane to deliver the beam forward to the end of the beam surface.

[0065] ⑤ The beam is hung on the back crane and the beam is delivered simultaneously by the front and rear cranes.

[0066] like Figure 10 As shown, the beam transport vehicle transports the beam to the designated location, and then the overhead crane lowers the beam lifting wire rope and connects it to the binding wire rope. The overhead crane then lifts the beam, simultaneously delivering it to the predetermined beam erection position with the preceding overhead crane. The crane stops for the first time and stabilizes the beam 1.5m from the predetermined position. It then stops again and stabilizes the beam 0.5m from the predetermined position. The preceding and following overhead cranes then proceed in steps, moving the beam intermittently to the predetermined position.

[0067] ⑥ Lower the beam into place, completing the erection of the first beam of ramp A.

[0068] like Figure 11 As shown, after the beam reaches the predetermined position, the beam end line and support center are adjusted, and the beam is lowered.

[0069] ⑦ Complete the erection of the remaining beams of the lower level A ramp in sequence.

[0070] ⑧ The beam transport vehicle transports beams on the intermediate level B ramp, while the bridge erecting machine station is located on the main bridge deck, and the beam erection construction of the intermediate level B ramp is completed in sequence.

[0071] ⑨ The beam transport vehicle transports beams on the upper main line, while the bridge erecting machine station is located on the main line bridge deck, and the upper main line beam erection construction is completed in sequence.

[0072] To ensure that the wire ropes do not interfere with the cap beam during lifting, calculations based on the cap beam width and the dimensions of the beam transport vehicle indicate a cap beam width of 3.2m. Therefore, each adjacent span of the beam occupies 1 / 2 of this width, totaling 1.6m. To prevent the wire ropes from touching the cap beam, a safety distance of 0.4cm to 0.5m is maintained. The beam is secured at the front lifting point 2m from the beam end, and at the rear lifting point 3 to 5m from the beam end. The securing points must undergo stress calculations, and implementation can only proceed after the calculations are approved. Specific details are as follows... Figure 14 As shown.

[0073] The project piers in this embodiment are located on a busy main road, with logistics companies on both sides of the road, resulting in high traffic volume and numerous large trucks. Full closure construction is not feasible; therefore, two-way four-lane traffic must be maintained during beam erection. To ensure the safety of vehicles passing underneath and the safety of construction work, half of the existing lanes need to be closed during beam erection. Each section of construction can only be carried out using a half-width construction and half-width closure method.

[0074] The following is a comparison of the benefits before and after optimizing the conventional construction method in this application embodiment.

[0075] The standard construction sequence is as follows: construction of the lower layer A substructure → construction of the A ramp beam erection → construction of the intermediate layer B substructure → construction of the B ramp beam erection → construction of the upper layer main substructure → construction of the main line beam erection.

[0076] After optimization, the substructure of the three-story bridge can be completed continuously in one go, and the bridge beams of the three-story bridge can also be completed continuously in one go, resulting in good construction continuity and facilitating construction organization.

[0077] The construction scheme proposed in this application not only improved the construction efficiency of the three-story bridge with shared piers, but also shortened the overall construction period by approximately 6 months and reduced construction costs by 4.12 million yuan. It demonstrates significant economic and social benefits. A detailed comparison is shown in the table below.

[0078] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for synchronously erecting beams at each level of a three-level bridge with shared piers for the main line and ramps, characterized in that... First, the three-tiered bridge with shared piers for the main line and ramps completed the construction of the three-tiered cap beams in one go; second, the bridge erecting machine was set up on the top of the main line bridge deck, and the beam transport vehicle was located at the lower level A ramp, the middle level B ramp, and the upper level main line respectively, cooperating with the bridge erecting machine to transport beams from the lower level, the middle level, and the upper level, respectively, so as to realize the one-time erection of the beams of the lower level A ramp, the middle level B ramp, and the upper level main line. Specifically, the steps include the following: Step 1: Use a highway beam transport vehicle to transport the beams from the already erected lower level A ramp beams to directly below the bridge erecting machine, and then feed the beams to the designated position on the lower level A ramp bridge deck; Step 2: The front end of the bridge girder is lifted by the overhead crane of the bridge erecting machine until it is detached from the girder transport vehicle; Step 3: The beam transport vehicle works in conjunction with the overhead crane to move the beam forward to the end of the bridge deck; Step 4: After the beam transport vehicle transports the beam to the designated location, the bridge erecting machine connects the beam to the rear trolley, and the rear trolley lifts the beam, simultaneously delivering it to the predetermined beam erection position with the front trolley. Step 5: After the beam reaches the predetermined position, adjust the beam end line and support center, lower the beam, and complete the erection of the first beam of the lower level A ramp; Step 6: Following steps 1 to 5 above, complete the erection of the remaining beams for the lower level A ramp in sequence; Step 7: The beam transport vehicle transports beams on the intermediate level B ramp, and the bridge erecting machine station is located on the main bridge deck. Following steps 1 to 5 above, the beam erection construction of the intermediate level B ramp is completed in sequence. Step 8: The beam transport vehicle transports beams on the upper main line, and the bridge erecting machine station is located on the main line bridge deck. Following steps one to five above, the upper main line beam erection construction is completed in sequence.

2. The method for synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps as described in claim 1, characterized in that, The beam transport vehicles in steps one and two are anti-aircraft gun beam transport vehicles, and the beam transport vehicles in steps three to five are tire-mounted beam transport vehicles. The method for synchronous erection of beams at each layer also includes a beam transport vehicle switching step between steps two and three. Specifically, the overhead crane of the bridge erecting machine lifts the rear end of the beam from the beam joint on the main bridge deck until it is separated from the anti-aircraft gun beam transport vehicle. The anti-aircraft gun beam transport vehicle is driven away, and the beam is switched to a tire-mounted beam transport vehicle. The rear end of the beam is then lowered onto the tire-mounted beam transport vehicle, and then the connection between the overhead crane and the beam is released.

3. The method for synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps as described in claim 2, characterized in that... When the beam is too long, making it impossible for the rear crane of the bridge erecting machine to lower the hook, the beam is moved to the rear crane's lifting point by the high-pressure beam transport vehicle in coordination with the front crane, so that the beam can be lowered into the rear lifting point, and the beam transport vehicle switching steps can continue.

4. The method for synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps as described in claim 1, characterized in that... In step one, after the beam is fed to the designated position, the overhang length of the front end of the beam shall not be less than 5m. If it does not meet the design requirements, the front end of the beam shall be lifted by the overhead crane of the bridge erecting machine during the feeding process to adjust it to meet the design requirements.

5. The method for synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps as described in claim 4, characterized in that... Two stiffening plates are symmetrically installed below the winch pulley blocks on both the front and rear overhead cranes. The spreader bar pin is extended and passes through the stiffening plates, with a lifting beam wire rope suspended on each side of the extended pin. Two binding wire ropes are correspondingly installed at the front and rear ends of the beam, connected to the two lifting beam wire ropes via shackles. The lower end of each binding wire rope is a loop that fits onto the beam. The upper part of the binding wire rope connecting to the lifting beam wire rope is a connecting part. The loop of the binding wire rope and the connecting part are connected by a connector, which is formed by a pair of connecting plates hinged at the top. The connecting part of the binding wire rope is connected to the top of the connector, and the loop is connected to both ends of the connector to form a complete loop.

6. The method for synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps as described in claim 1, characterized in that, In step four, the front crane and the rear crane move the beam to the predetermined position in steps, stopping and stabilizing the beam for the first time at 1.5m from the predetermined position; and stopping and stabilizing the beam for the second time at 0.5m from the predetermined position.

7. The method for synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps as described in claim 2, characterized in that, In step one, after the beam is fed to the designated position, triangular sleepers are placed at a set distance from the front end of the installed beam to prevent the beam transport vehicle from slipping. In the beam transport vehicle switching step, triangular sleepers are placed at the wheels of the tire beam transport vehicle to prevent the tire beam transport vehicle from slipping.

8. The method for synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps as described in claim 5, characterized in that, The connection points between the rear and front cranes and the beam are set according to the predetermined positions to ensure that the wire ropes do not interfere with the cap beam when the front and rear cranes lift the beam.

9. The method for synchronous erection of beams at each level of a three-level bridge with shared piers for the main line and ramps as described in claim 1, characterized in that, During the bridge girder erection, the existing road is partially closed. Each section of the road can only be constructed with half of the road closed at a time to ensure the safety of vehicles passing underneath and the safety of the construction work.

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