Frame dismounting integrated bridge girder erection machine and construction method thereof

Abstract

The invention belongs to the technical field of bridge construction, and particularly provides a frame disassembly integrated bridge girder erection machine and a construction method thereof.The frame disassembly integrated bridge girder erection machine comprises a main beam, a first supporting leg, a second supporting leg, a third supporting leg, a fourth supporting leg, a fifth supporting leg, a first crown block and a second crown block, the main beam comprises two longitudinal beams and two fixed cross beams, and the two longitudinal beams are distributed front and back at intervals; the left ends and the right ends of the two longitudinal beams are connected through a fixed cross beam, the second crown block and the first crown block are connected between the two longitudinal beams from left to right and located between the two fixed cross beams, and the lower portions of the two longitudinal beams are sequentially connected with a fifth supporting leg, a fourth supporting leg, a third supporting leg, a second supporting leg and a first supporting leg at intervals from left to right. The main beam is of a full box beam structure. The problems that when the bridge surface of an existing urban viaduct is widened, the construction work amount is large, cost is high, the construction period is long, and influences on traffic are large are solved. While widening of the viaduct deck is guaranteed, the construction work amount is small, the cost is low, the construction period is short, and the influence on traffic is small.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, specifically relating to an integrated bridge erection machine for dismantling and rebuilding and its construction method. Background Technology

[0002] The existing elevated bridges in a certain urban area use a standard span of 30m, with some sections using spans of 20-25m. The superstructure of the elevated bridges uses precast concrete T-beams or hollow slab beams, with precast concrete T-beams being the primary component. Some sections use steel box girders or variable cross-section cast-in-place box girders. The substructure of the elevated bridges uses double-column piers or double-column piers with cap beams and pile foundations. The existing elevated bridge deck is relatively narrow, and with the increasing traffic volume, the existing elevated bridges cannot cope with the growing traffic pressure, requiring widening of the elevated bridge deck. However, if the bridge deck is widened further, the entire elevated bridge will need to be demolished and rebuilt. Demolition and reconstruction will affect traffic flow underneath the elevated bridge, further increasing traffic pressure, and will involve a large amount of construction work, high costs, and a long construction period.

[0003] Chinese patent document CN120700800A discloses a construction method for an elevated bridge in a confined space. The construction method for an elevated bridge in a confined space is as follows: Step 1, construction of the pile foundation platform; Step 2, construction of the cast-in-place cap beam; Step 3, installation of the gantry structure; Step 4, component acceptance and transportation; Step 5, on-site assembly; Step 6, installation of temporary supports; Step 7, trial lifting; Step 8, installation of the box girder; Step 9, dismantling of the supports. In this document, the gantry structure is slidably installed on the track distribution beam set on the non-motorized vehicle lane, and the foundation of the temporary support is set on the driving lane, so that the temporary support distributes the load through the column base distribution beam, and the top is equipped with an adjusting steel pipe to finely adjust the elevation of the box girder. The box girder is assembled in segments, and the weight of the gantry structure can be reduced by welding the connecting crossbeams into segments. This makes it suitable for operations in small spaces and reduces cumulative errors through segmented welding. Clearance is left during disassembly to avoid collisions between the box girder and the support. The disassembly process is controllable and protects the integrity of the main structure. However, this does not solve the problems of large construction workload, high cost, long construction period, and significant traffic impact when widening the urban elevated bridge deck, as described in this application. Summary of the Invention

[0004] The present invention provides an integrated bridge erection machine and its construction method, which aims to overcome the problems of large construction workload, high cost, long construction period and significant impact on traffic when widening urban elevated bridges in the prior art.

[0005] To address this, the present invention provides an integrated bridge erecting and dismantling machine, comprising a main beam, support legs one, two, three, four, and five, overhead crane one and two. The main beam includes two longitudinal beams and two fixed crossbeams. The two longitudinal beams are spaced apart front to back, and the left and right ends of the two longitudinal beams are connected by a fixed crossbeam. Overhead crane two and overhead crane one are connected from left to right between the two longitudinal beams, and overhead crane two and overhead crane one are located between the two fixed crossbeams. The lower parts of the two longitudinal beams are sequentially connected from left to right to support legs five, four, three, two, and one. The main beam adopts a full box girder structure.

[0006] Preferably, the first and fifth outriggers have the same structure, and the second and fourth outriggers have the same structure.

[0007] Preferably, the outrigger includes two branch outrigger units and a cross beam. The two branch outrigger units are connected to the bottom of the cross beam and are symmetrically distributed front and rear. Each branch outrigger unit includes a vertical telescopic sleeve, a lifting cylinder, a diagonal brace, and a traveling trolley. The upper part of the vertical telescopic sleeve is connected to the bottom of the cross beam, and the diagonal brace is connected between the side of the vertical telescopic sleeve and the cross beam. The lower part of the vertical telescopic sleeve is connected to the traveling trolley via the lifting cylinder. The upper part of the cross beam is connected to a longitudinal beam.

[0008] Preferably, the second outrigger includes two branch outrigger units and a transverse beam, with the two branch outrigger units symmetrically connected to the transverse beam. Each branch outrigger unit includes a reverse-mounted wheel mechanism, a towing wheel mechanism, a transverse movement mechanism, and a lifting mechanism. The upper part of the reverse-mounted wheel mechanism is attached to the outside of the longitudinal beam, and the lower part of the reverse-mounted wheel mechanism is connected to the transverse movement mechanism through the towing wheel mechanism. The transverse movement mechanism is connected to the upper part of the transverse beam, and the lower part of the transverse beam is connected to the lifting mechanism.

[0009] Preferably, the third outrigger includes two branch outrigger units and a support beam, with the two branch outrigger units symmetrically connected to the support beam. Each branch outrigger unit includes a second anti-roller mechanism, a second towing wheel mechanism, a telescopic sleeve, and a second lifting cylinder. The upper part of the second anti-roller mechanism is attached to the outside of the longitudinal beam, and the lower part of the second anti-roller mechanism is connected to the support beam via the second towing wheel mechanism. The upper part of the telescopic sleeve is connected to the support beam, and the lower part of the telescopic sleeve is connected to the second lifting cylinder.

[0010] Preferably, both the first and second overhead cranes include a hoisting mechanism, a second lateral movement mechanism, a main crossbeam, and two sets of power traction structures. The main crossbeam is connected between two longitudinal beams, and the second lateral movement mechanism is connected to the main crossbeam. The second lateral movement mechanism is connected to the hoisting mechanism. One set of power traction structures is connected to the front side of the front longitudinal beam and the rear side of the rear longitudinal beam.

[0011] Preferably, the lower part of the lifting mechanism is connected to a lifting device, and the lower part of the lifting device is provided with a pin and a lifting hole.

[0012] A construction method based on any one of the bridge erecting and dismantling integrated bridge erecting machines includes the following steps: S1. Install the bridge erecting machine that integrates dismantling and erection on the old bridge to be dismantled, and move the main beam, leg one, leg two, leg three, leg four and leg five to the beam erection position. S2. Remove the old beams of the target span and use overhead cranes 1 and 2 to hoist the removed old beams to the beam transport vehicle, which will then complete the transfer. S3. The beam transport vehicle delivers the new beam to the target position, and the overhead crane 1 and overhead crane 2 lift the new beam to the target span of the old beam that was removed in step S2 to complete the installation.

[0013] Preferably, the old bridge is an old viaduct, and demolishing the old beams means demolishing the superstructure of the old viaduct. The superstructure of the old viaduct includes precast concrete T-beams and hollow slab beams.

[0014] Preferably, the new beam is a large cantilever steel box girder.

[0015] The beneficial effects of this invention are: The bridge erection machine and its construction method provided by this invention utilize the integrated bridge erection machine for dismantling and rebuilding. Installation is completed by dismantling the old beams of the target span and then installing new beams on top of them (i.e., dismantling one span and erecting one span). Through orderly construction involving closing, modifying, and opening sections, the road is restored to public use, minimizing the impact on existing traffic. The dismantling of the old beams only removes the superstructure of the old viaduct, maintaining the substructure unchanged, ensuring that the widening of the main viaduct is achieved without reducing the capacity of the auxiliary lanes. The new beams are lightweight large cantilever steel box girders, reducing the dead load on the superstructure of the viaduct and the total load, including vehicle loads, after bridge widening. This method features high construction efficiency, low project costs, and minimal social impact. Furthermore, the integrated bridge erection machine has a simple structure, good maneuverability during construction, and enables full-section operation of the viaduct. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the integrated bridge erecting and dismantling machine during construction. Figure 2 This is a top view of the main beam structure; Figure 3 This is a structural diagram of a support leg installed on an old beam; Figure 4 This is a structural diagram of the second support leg installed on the new beam; Figure 5 This is a structural diagram of the three outriggers installed on the new beam; Figure 6 This is a structural diagram of the four outriggers installed on the new beam; Figure 7 This is a structural diagram of the fifth support leg installed on the new beam; Figure 8 It is a structural diagram of support leg one or support leg five; Figure 9 It is a structural diagram of support leg two or support leg four; Figure 10 This is a structural diagram of the third support leg; Figure 11 This is the left view of the anti-rollover mechanism connecting the tractor mechanism and the longitudinal beam; Figure 12 It is a structural diagram of crane one or crane two; Figure 13 It is a structural diagram of the lifting holes on the lifting device; Figure 14 This is a diagram showing the pin structure on the lifting device; Figure 15 This is the construction flowchart (Part 1) of Example 4; Figure 16 This is the construction flowchart (Part Two) of Example 4; Figure 17 This is the construction flowchart (Part 3) for Example 4; Figure 18 This is the construction flowchart of Example 4 (Part Four); Figure 19 This is a schematic diagram of the cross-section of the existing concrete box girder (old beam); Figure 20 This is a schematic diagram of the cross-section of the new beam after it has been widened by replacing the beam. Figure 21 This is a schematic diagram of the old beam being divided into sections.

[0018] Explanation of reference numerals in the attached diagram: 1. Main beam; 2. Support leg one; 3. Support leg two; 4. Support leg three; 5. Support leg four; 6. Support leg five; 7. Overhead crane one; 8. Overhead crane two; 9. Beam transport vehicle; 1.1 Longitudinal beam; 1.2 Fixed crossbeam; 2.1 Vertical telescopic sleeve; 2.2 Lifting cylinder one; 2.3 Diagonal brace; 2.4 Traveling trolley; 2.5 Horizontal connecting beam; 3.1 Lateral movement beam; 3.2 Reverse roller mechanism 1; 3.3 Tug roller mechanism 1; 3.4 Lateral movement mechanism 1; 3.5 Lifting mechanism; 4.1 Support beam; 4.2 Reverse roller mechanism II; 4.3 Towing roller mechanism II; 4.4 Telescopic sleeve; 4.5 Lifting cylinder II; 7.1 Lifting mechanism; 7.2 Lateral movement mechanism II; 7.3 Main crossbeam; 7.4 Lifting device; 7.5 Power traction structure; 7.41 Pin; 7.42 Lifting hole. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] Example 1: like Figure 1 and Figure 2 As shown, an integrated bridge erecting and dismantling machine includes a main beam 1, support legs 1 2, support legs 2 3, support legs 3 4, support legs 4 5, support legs 5 6, overhead crane 1 7, and overhead crane 2 8. The main beam 1 includes two longitudinal beams 1.1 and two fixed crossbeams 1.2. The two longitudinal beams 1.1 are spaced apart front to back, and the left and right ends of the two longitudinal beams 1.1 are connected by a fixed crossbeam 1.2. The overhead crane 2 8 and overhead crane 1 7 are connected from left to right between the two longitudinal beams 1.1, and the overhead crane 2 8 and overhead crane 1 7 are located between the two fixed crossbeams 1.2. The lower part of the two longitudinal beams 1.1 is connected from left to right to support legs 5 6, support legs 4 5, support legs 3 4, support legs 2 3, and support legs 1 2 in sequence. The main beam 1 adopts a full box girder structure.

[0021] Specifically, the main beam 1 adopts a full box girder structure, which can meet the requirements of forward and reverse construction and facilitates adaptability to other projects in the future. The box girders are connected by splice plates, which can reduce the deflection generated during the manufacturing process and improve the stability of the product. The left and right ends of the two longitudinal beams 1.1 are connected by a fixed crossbeam 1.2 to ensure the stability of the entire structure.

[0022] During construction, the integrated bridge erection machine is installed on the old bridge to be demolished. Main beam 1, outriggers 1, 2, 3, 4, 5, and 6 are moved to the erection position. The old beam of the target span is then dismantled. Overhead cranes 1 and 2 are used to hoist the dismantled beam to beam transport vehicle 9, which then transports it. The beam transport vehicle 9 transports the new beam to the target position, and overhead cranes 7 and 2 hoist it to the target span of the dismantled old beam for installation. The integrated bridge erection machine is used for dismantling and rebuilding the bridge. Installation is completed by dismantling the old beam of the target span and then installing the new beam on top of it (i.e., dismantling one span and erecting one span). Through orderly construction involving closing sections, modifying sections, and opening sections, the road is restored to the public, minimizing the impact on existing traffic. This method features high construction efficiency, low project costs, and minimal social impact. Furthermore, the integrated bridge erection machine has a simple structure, good maneuverability during construction, and enables full-section operation of the viaduct.

[0023] Preferably, the length of the main beam 1 is sufficient to allow for simultaneous construction of two spans, and beam transport operations can be completed both forward and backward (left and right directions in the figure).

[0024] Example 2: Based on Example 1, such as Figures 3-11As shown, support leg 1 2 and support leg 5 6 have the same structure, and support leg 2 3 and support leg 4 5 have the same structure.

[0025] Specifically, outrigger 1 (2) and outrigger 5 (6) have the same structure, meeting the bidirectional erection requirements of the integrated bridge erection machine. Outrigger 2 (3) and outrigger 4 (5) are the main load-bearing outriggers, ensuring stability during the beam lifting process.

[0026] Preferably, the outrigger 2 includes two branch outrigger units and a crossbeam 2.5. The two branch outrigger units are connected to the bottom of the crossbeam 2.5, and the two branch outrigger units are symmetrically distributed front and rear. Each branch outrigger unit includes a vertical telescopic sleeve 2.1, a lifting cylinder 2.2, a diagonal brace 2.3, and a traveling trolley 2.4. The upper part of the vertical telescopic sleeve 2.1 is connected to the bottom of the crossbeam 2.5, and the diagonal brace 2.4 is connected between the side of the vertical telescopic sleeve 2.1 and the crossbeam 2.5. The lower part of the vertical telescopic sleeve 2.1 is connected to the traveling trolley 2.4 through the lifting cylinder 2.2. The upper part of the crossbeam 2.5 is connected to the longitudinal beam 1.1.

[0027] Specifically, the horizontal connecting beam 2.5 is fixedly connected to the upper part of the branch leg unit. By adjusting the telescopic length of the vertical telescopic sleeve 2.1 and the lifting height of the lifting cylinder 2.2, the horizontal connecting beam 2.5 is driven to rise and fall, which in turn drives the main beam 1 to rise and fall, adjusting the position of the main beam 1; the traveling trolley 2.4 facilitates the movement of the outrigger 2; the diagonal brace 2.3 improves the stability of the outrigger 2 when it is supported.

[0028] Preferably, the spacing between the two vertical telescopic sleeves 2.1 is such that the beam can be supported by the beam transport vehicle 9 between the two vertical telescopic sleeves 2.1.

[0029] Preferably, the second outrigger 3 includes two branch outrigger units and a transverse beam 3.1. The two branch outrigger units are symmetrically connected to the transverse beam 3.1. Each branch outrigger unit includes a reverse wheel mechanism 3.2, a towing wheel mechanism 3.3, a transverse mechanism 3.4, and a lifting mechanism 3.5. The upper part of the reverse wheel mechanism 3.2 is attached to the outside of the longitudinal beam 1.1. The lower part of the reverse wheel mechanism 3.2 is connected to the transverse mechanism 3.4 through the towing wheel mechanism 3.3. The lower part of the transverse mechanism 3.4 is connected to the upper part of the transverse beam 3.1. The lower part of the transverse beam 3.1 is connected to the lifting mechanism 3.5.

[0030] Specifically, the anti-roller mechanism 3.2 can drive the branch leg unit 2 to move along the longitudinal beam 1.1 to complete the crawling through the hole; the lifting mechanism 3.5 ensures the switching of the support leg 2 3 during the crawling through the hole, that is, when the lifting mechanism 3.5 extends, the support leg 2 3 plays a supporting role, and when the lifting mechanism 3.5 retracts, the anti-roller mechanism 3.2 is hooked on the outside of the longitudinal beam 1.1, which can drive the branch leg unit 2 to move along the longitudinal beam 1.1; the lateral movement mechanism 3.4 can move along the lateral movement beam 3.1, which facilitates the adjustment of the position of the anti-roller mechanism 3.2 and the towing wheel mechanism 3.3; the anti-roller mechanism 3.2, the towing wheel mechanism 3.3, the lateral movement mechanism 3.4 and the lifting mechanism 3.5 all adopt existing devices, and the anti-roller mechanism 3.2, the towing wheel mechanism 3.3 and the lateral movement mechanism 3.4 all have drive motors.

[0031] Preferably, the outrigger 3 4 includes two branch outrigger 3 units and a support beam 4.1. The two branch outrigger 3 units are symmetrically connected to the support beam 4.1. The branch outrigger 3 unit includes a reverse hanging wheel mechanism 4.2, a towing wheel mechanism 4.3, a telescopic sleeve 4.4, and a lifting cylinder 4.5. The upper part of the reverse hanging wheel mechanism 4.2 is hooked to the outside of the longitudinal beam 1.1, and the lower part of the reverse hanging wheel mechanism 4.2 is connected to the support beam 4.1 through the towing wheel mechanism 4.3. The upper part of the telescopic sleeve 4.4 is connected to the support beam 4.1, and the lower part of the telescopic sleeve 4.4 is connected to the lifting cylinder 4.5.

[0032] Specifically, the reverse roller mechanism 4.2 can drive the branch leg 3 unit to move along the longitudinal beam 1.1. By adjusting the extension and retraction of the telescopic sleeve 4.4 and the extension and retraction of the lifting cylinder 4.5, the support of the leg 3 4 on the beam surface and the cap beam can be switched.

[0033] Example 3: Based on Example 2, such as Figure 12 As shown, both the first crane 7 and the second crane 8 include a hoisting mechanism 7.1, a second lateral movement mechanism 7.2, a main crossbeam 7.3, and two sets of power traction structures 7.5. The main crossbeam 7.3 is connected between two longitudinal beams 1.1. The second lateral movement mechanism 7.2 is connected to the main crossbeam 7.3. The second lateral movement mechanism 7.2 is connected to the hoisting mechanism 7.1. One set of power traction structures 7.5 is connected to the front side of the front longitudinal beam 1.1 and the rear side of the rear longitudinal beam 1.1.

[0034] Specifically, the lifting mechanism 7.1 is used to lift and lower the suspended beam, the second lateral movement mechanism 7.2 is used to move the lifting mechanism 7.1 along the main crossbeam 7.3, and the power traction structure 7.5 is used to adjust the position of the longitudinal beam 1.1. The power traction structure 7.5 includes a chain traction device and a main beam towing device. The main beam towing device is connected to the longitudinal beam 1.1 on the same side through the chain traction device, which facilitates the adjustment of the position of the longitudinal beam 1.1 and provides good stability. The lifting mechanism 7.1, the second lateral movement mechanism 7.2, the chain traction device, and the main beam towing device all use existing devices.

[0035] Preferred, such as Figures 13-14 As shown, a lifting device 7.4 is connected to the lower part of the lifting mechanism 7.1. The lower part of the lifting device 7.4 is provided with a pin 7.41 and a lifting hole 7.42.

[0036] Specifically, the lifting hole 7.42 facilitates the hoisting of the beam (old beam) with ropes, and the pin 7.41 connects the lifting device 7.4 to the beam (new beam) by inserting it into the fixed lug on the beam, making it highly versatile.

[0037] Example 4: Based on Example 3, such as Figures 15-18 As shown, a construction method based on any one of the integrated bridge erection and dismantling machines includes the following steps: S1. Install the bridge erecting machine that integrates dismantling and erection on the old bridge to be dismantled, and move the main beam 1, support leg 1 2, support leg 2 3, support leg 3 4, support leg 4 5 and support leg 5 6 to the beam erection position. Specifically, step S1 includes the following steps: S1.1 Install the integrated bridge erection machine on the old bridge to be dismantled, retract the lifting cylinder 24.5 of outrigger 3 4, lock the overhead crane 2 8 with outrigger 4 5 through the lifting mechanism 7.1, release the locking between outrigger 2 3, outrigger 4 5 and main beam 1, and prepare to pass through the hole; S1.2, outrigger 1 2 and outrigger 5 6 crawl on the beam surface, main beam 1 moves to the right, outrigger 3 4 moves to the right with main beam 1, and outrigger 2 3 and outrigger 4 5 remain stationary. S1.3, the lifting mechanism 3.5 of outrigger 4 5 is retracted and detached from the beam surface, the crane 2 8 is unlocked from outrigger 4 5, and the anti-hanging wheel mechanism 1 3.2 is used to drive outrigger 4 5 to walk along the main beam 1 to the end of the newly erected steel beam (the right end of the newly erected steel beam in the figure) for support (the lifting mechanism 3.5 of outrigger 4 5 is lifted to contact the beam surface). S1.4, the lifting mechanism 3.5 of outrigger 2 3 is retracted and detached from the beam surface. The reverse wheel mechanism 3.2 drives outrigger 2 3 to move along the main beam 1 to the left side of outrigger 1 2 for support (the lifting mechanism 3.5 of outrigger 2 3 is lifted and contacts the beam surface); at this time, the distance between outrigger 3 4 and outrigger 2 3 is two holes. S1.5, the crane 28 and the support leg 45 are locked, the support leg 12 and the support leg 56 crawl on the beam surface, the main beam 1 moves to the right by one span, the support leg 34 moves to the right by one span with the main beam 1, and the support leg 23 and the support leg 45 remain stationary; the beam erection position is reached.

[0038] S2. Remove the old beams of the target span and use overhead crane 7 and overhead crane 2 8 to hoist the removed old beams to beam transport vehicle 9, which will then transfer them. Specifically, step S2 includes the following steps: S2.1, The beam transport vehicle 9 arrives at the position between support leg 1 2 and support leg 2 3, and cuts the old beam between support leg 2 3 and support leg 3 4 on site; S2.2, Crane 1 7 and Crane 2 8 reach the lifting position between support leg 2 3 and support leg 3 4, and hoist the cut old beam to beam transport vehicle 9; S2.3, the telescopic sleeve 4.4 and the lifting cylinder 2 4.5 of outrigger 3 4 are retracted, and the reverse wheel mechanism 2 4.2 drives outrigger 3 4 to move to the right to the pier position below outrigger 3 4. The telescopic sleeve 4.4 and the lifting cylinder 2 4.5 extend to support the pier. S2.4, The beam transport vehicle 9 moves to the beam erection between support leg 4 5 and support leg 5 6, and cuts the old beam between support leg 3 4 and support leg 4 5 on site; S2.5, Overhead Cranes 1 and 2 reach the lifting position between Outer Leg 3 and Outer Leg 4, 5, and hoist the cut old beams onto the beam transport vehicle 9; the beam transport vehicle 9 then completes the transfer of the dismantled old beams. Specifically, the old beams are longitudinally divided into sections according to a front-to-back or back-to-front sequence, and hoisted sequentially from the outside in, such as... Figure 21 As shown, the first and fourth blocks are hoisted first, followed by the second and third blocks.

[0039] S3. The beam transport vehicle 9 transports the new beam to the target position, and the overhead crane 7 and the overhead crane 8 lift the new beam to the target span of the old beam that was removed in step S2 to complete the installation.

[0040] Specifically, step S3 includes the following steps: S3.1, The beam transport vehicle 9 transports the new beam to the beam erection platform between support leg 4 5 and support leg 5 6; S3.2, Crane 1 7 and Crane 2 8 will install the new beam onto the pier between support leg 3 4 and support leg 4 5; S3.3, the telescopic sleeve 4.4 of outrigger 3 4 and the lifting cylinder 2 4.5 are retracted, and the reverse wheel mechanism 2 4.2 drives outrigger 3 4 to move to the left to the right end face of the new beam installed in step S3.2; S3.4, Crane 1 7 and Crane 2 8 will install the new beam onto the pier between support leg 3 4 and support leg 2 3; Complete the erection of the new beam by following the steps described above.

[0041] This invention employs a method of installing a new beam on the target span of an existing, demolished beam (i.e., demolishing one span and erecting one span, or demolishing two spans and erecting two spans) to complete the installation. Through orderly construction involving closing off sections, modifying sections, and opening sections, the road is returned to the public, minimizing the impact on existing traffic. It features high construction efficiency, low project costs, and minimal social impact.

[0042] Example 5: Based on Example 4, such as Figure 19 and Figure 20 As shown, the old bridge is an old viaduct, and demolishing the old beams means demolishing the superstructure of the old viaduct. The superstructure of the old viaduct includes precast concrete T-beams and hollow slab beams.

[0043] Specifically, removing the old beams only involves dismantling the upper structure of the old viaduct while keeping the lower structure of the viaduct unchanged. This ensures that the main viaduct can be widened without reducing the traffic capacity of the auxiliary lanes.

[0044] Preferably, the new beam is a large cantilever steel box girder.

[0045] Specifically, the new beams adopt lightweight large cantilever steel box girders, which reduces the dead load of the elevated bridge superstructure and the total load, including vehicle loads, after the bridge is widened.

[0046] In the description of this invention, it should be understood that if terms such as "left," "inner," or "right" indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, it does 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, the terms used to describe positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention.

[0047] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A bridge erecting machine that integrates dismantling and reassembly, characterized in that: The structure includes a main beam (1), support leg one (2), support leg two (3), support leg three (4), support leg four (5), support leg five (6), crane one (7) and crane two (8). The main beam (1) includes two longitudinal beams (1.1) and two fixed crossbeams (1.2). The two longitudinal beams (1.1) are distributed at intervals. The left and right ends of the two longitudinal beams (1.1) are connected by a fixed crossbeam (1.2). Crane two (8) and crane one (7) are connected between the two longitudinal beams (1.1) from left to right. Crane two (8) and crane one (7) are located between the two fixed crossbeams (1.2). The lower part of the two longitudinal beams (1.1) is connected to support leg five (6), support leg four (5), support leg three (4), support leg two (3) and support leg one (2) in sequence from left to right. The main beam (1) adopts a full box beam structure.

2. The integrated bridge erecting machine for dismantling and reassembling as described in claim 1, characterized in that: The first (2) and the fifth (6) of the outriggers have the same structure, and the second (3) and the fourth (5) of the outriggers have the same structure.

3. The integrated bridge erecting machine for dismantling and reassembling as described in claim 2, characterized in that: The outrigger 1 (2) includes two branch outrigger units and a cross beam (2.5). The two branch outrigger units are connected to the bottom of the cross beam (2.5). The two branch outrigger units are symmetrically distributed front and back. The branch outrigger unit includes a vertical telescopic sleeve (2.1), a lifting cylinder (2.2), a diagonal brace (2.3), and a traveling trolley (2.4). The upper part of the vertical telescopic sleeve (2.1) is connected to the bottom of the cross beam (2.5). The diagonal brace (2.4) is connected between the side of the vertical telescopic sleeve (2.1) and the cross beam (2.5). The lower part of the vertical telescopic sleeve (2.1) is connected to the traveling trolley (2.4) through the lifting cylinder (2.2). The upper part of the cross beam (2.5) is connected to the longitudinal beam (1.1).

4. The integrated bridge erecting machine for dismantling and reassembling as described in claim 2, characterized in that: The second outrigger (3) includes two branch outrigger units and a transverse beam (3.1). The two branch outrigger units are symmetrically connected to the transverse beam (3.1). The branch outrigger unit includes a reverse wheel mechanism (3.2), a towing wheel mechanism (3.3), a transverse mechanism (3.4), and a lifting mechanism (3.5). The upper part of the reverse wheel mechanism (3.2) is attached to the outside of the longitudinal beam (1.1). The lower part of the reverse wheel mechanism (3.2) is connected to the transverse mechanism (3.4) through the towing wheel mechanism (3.3). The transverse mechanism (3.4) is connected to the upper part of the transverse beam (3.1). The transverse beam (3.1) is connected to the lifting mechanism (3.5).

5. The integrated bridge erecting machine for dismantling and reassembling as described in claim 1, characterized in that: The outrigger three (4) includes two branch outrigger three units and a support beam (4.1). The two branch outrigger three units are symmetrically connected to the support beam (4.1) front and rear. The branch outrigger three units include a reverse hanging wheel mechanism two (4.2), a towing wheel mechanism two (4.3), a telescopic sleeve (4.4), and a lifting cylinder two (4.5). The upper part of the reverse hanging wheel mechanism two (4.2) is hooked to the outside of the longitudinal beam (1.1). The lower part of the reverse hanging wheel mechanism two (4.2) is connected to the support beam (4.1) through the towing wheel mechanism two (4.3). The upper part of the telescopic sleeve (4.4) is connected to the support beam (4.1), and the lower part of the telescopic sleeve (4.4) is connected to the lifting cylinder two (4.5).

6. The integrated bridge erecting machine for dismantling and reassembling as described in claim 1, characterized in that: Both the first overhead crane (7) and the second overhead crane (8) include a hoisting mechanism (7.1), a second transverse mechanism (7.2), a main crossbeam (7.3), and two sets of power traction structures (7.5). The main crossbeam (7.3) is connected between two longitudinal beams (1.1). The second transverse mechanism (7.2) is connected to the main crossbeam (7.3). The second transverse mechanism (7.2) is connected to the hoisting mechanism (7.1). One set of power traction structures (7.5) is connected to the front side of the front longitudinal beam (1.1) and the rear side of the rear longitudinal beam (1.1).

7. The integrated bridge erecting machine for dismantling and reassembling as described in claim 6, characterized in that: The lower part of the lifting mechanism (7.1) is connected to a lifting device (7.4), and the lower part of the lifting device (7.4) is provided with a pin (7.41) and a lifting hole (7.42).

8. A construction method based on the integrated bridge erection and dismantling machine according to any one of claims 1-7, characterized in that: Includes the following steps: S1. Install the bridge erecting machine that integrates dismantling and erection on the old bridge to be dismantled, and move the main beam (1), leg one (2), leg two (3), leg three (4), leg four (5) and leg five (6) to the beam erection position; S2. Remove the old beams of the target span and use crane 1 (7) and crane 2 (8) to hoist the removed old beams to the beam transport vehicle (9), which will then complete the transfer. S3. The beam transport vehicle (9) transports the new beam to the target position, and the overhead crane (7) and the overhead crane (8) lift the new beam to the target span of the old beam that was removed in step S2 to complete the installation.

9. The construction method of the integrated bridge erecting and dismantling machine as described in claim 8, characterized in that: The old bridge is the old viaduct. Demolishing the old beams means demolishing the superstructure of the old viaduct, which includes precast concrete T-beams and hollow slab beams.

10. The construction method of the integrated bridge erecting and dismantling machine as described in claim 8, characterized in that: The new beam is a large cantilever steel box girder.

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