A cantilever casting and cantilever erection combined crane for a steel-concrete hybrid variable cross-section continuous box girder bridge

Abstract

The invention discloses a suspension casting and suspension splicing combined crane for a steel-concrete hybrid variable cross-section continuous box girder bridge, which relates to the field of bridge construction equipment. In the invention, a lifting mechanism is movably installed on a spliced double-layer track beam, and the position of the lifting mechanism can be adjusted by moving along the double-layer track beam, without moving the whole crane forward by one beam segment every time a beam segment is hoisted during the suspension splicing construction of the bridge steel beam segment. This reduces the bearing pressure at the end of the steel beam segment, prevents excessive deflection of the end of the steel beam segment due to excessive bearing weight, which is not conducive to linear control, and can improve the quality of bridge splicing construction. Moreover, a support frame supporting the bridge deck is installed at the bottom of each track beam, which can support the spliced track beam, thereby improving the stability of the track beam installation and the stability of the lifting mechanism during hoisting work. In addition, the weight of the crane is dispersed to the bridge deck through multiple support frames, so that the force on the bridge is dispersed, preventing excessive force on the bridge support point due to single-point support, which may cause the support point to be squeezed and deformed.

Description

Technical Field

[0001] The invention belongs to the field of bridge construction equipment. Specifically, it particularly relates to a combined suspension and erection crane for a steel-concrete hybrid variable cross-section continuous box girder bridge. Background Art

[0002] With the development of long-span bridges, rationally utilizing the organizational properties of various materials, improving the comprehensive ability to resist natural disasters, and ensuring the lowest cost during the service life are the development trends of bridge structure design. The hybrid beam structure is a specific embodiment of material optimization. The steel-concrete hybrid variable cross-section continuous box girder bridge can effectively solve the problems of a new bridge crossing a river in one span, limited side spans, and limited clearance in the span range of 180 - 350 meters. The spliced steel box girder is used for the mid-span closure section of the variable cross-section continuous box girder bridge, which can effectively reduce the beam height at the mid-span, shorten the lengths of the side spans and approach bridges, reduce the construction links, engineering quantity, and high-altitude operation risks of cantilever casting construction, effectively shorten the construction period, and reduce the project cost. During the splicing construction of the steel box girder section of the steel-concrete hybrid variable cross-section continuous box girder bridge, a crane is required to lift the steel box girder and weld and assemble it with the existing bridge section.

[0003] Chinese Patent CN214143330U discloses a suspension and erection device for a steel beam carried by a crane, including a main beam, a traveling system, a support system, and a lifting system; the lifting system is a truck crane with outriggers at the bottom; the support system includes Bailey beams and distribution beams, and the distribution beams are placed on top of the Bailey beams; the traveling system includes hydraulic jacks, toothed plates, toothed blocks, slideway beams, and slides. One end of the hydraulic jack is connected to the toothed block, the other end of the hydraulic jack is connected to the slideway beam, the slideway beam is arranged below the Bailey beam, the slideway beam is detachably connected to the slide below, and the slide contacts the toothed plate below. The toothed plate is arranged on the main beam with multiple tooth grooves spaced on the surface, and the toothed block can be inserted into the tooth groove. Among them, a truck crane is installed through the traveling system and the support system to carry out the hoisting and splicing of the steel beam. However, during the specific construction process, it is necessary to move the traveling system, support system, and truck crane forward by one beam section for each beam section hoisted, so that the huge weight of the equipment is always applied to the end of the steel beam section, resulting in excessive deflection due to excessive bearing capacity at the end of the steel beam, which is not conducive to linear control and thus affects the bridge construction quality. Summary of the Invention

[0004] In view of the problems in the related art, the present invention provides a combined suspension and erection crane for a steel-concrete hybrid variable cross-section continuous box girder bridge to overcome the technical problems existing in the related art that during the suspension and erection construction of the steel beam section of the bridge, it is necessary to move the suspension equipment forward by one beam section for each beam section hoisted, so that the huge weight of the equipment is always applied to the end of the steel beam section, resulting in excessive deflection due to excessive bearing capacity at the end of the steel beam, which is not conducive to linear control and thus affects the bridge construction quality.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention relates to a suspension casting and suspension splicing combined crane for a steel-concrete hybrid variable cross-section continuous box girder bridge, which includes a suspension support. At the top of the suspension support, two double-layer track beams are fixedly installed opposite to each other and distributed in parallel. At the ends of the two double-layer track beams, multiple double-layer track beams are continuously spliced. A reinforcing cross bar is fixedly installed between each pair of opposite double-layer track beams, and a support frame is fixedly installed at the bottom of each double-layer track beam;

[0007] A hoisting mechanism is slidably installed on the upper layer of the double-layer track beam, and a load platform is slidably installed on the lower layer of the double-layer track beam. An openable connecting shaft is fixedly installed between the hoisting mechanism and the load platform. When the load platform slides along the lower layer of the double-layer track beam, the load platform drives the hoisting mechanism to slide synchronously on the upper layer of the double-layer track beam through the openable connecting shaft;

[0008] The openable connecting shaft can contract and disconnect at the height of the reinforcing cross bar;

[0009] Two groups of openable connecting shafts are provided, and the two groups of openable connecting shafts are respectively fixedly installed on the front and rear sides of the load platform;

[0010] When the front openable connecting shaft moves with the load platform past the reinforcing cross bar, the front openable connecting shaft contracts and disconnects, while the rear openable connecting shaft remains connected;

[0011] When the rear openable connecting shaft moves with the load platform past the reinforcing cross bar, the rear openable connecting shaft contracts and disconnects, while the front openable connecting shaft resumes the connected state.

[0012] Further, the suspension support includes a slide rail and a sliding frame. The sliding frame is slidably installed on the slide rail, and an anchoring seat is fixedly installed on the sliding frame.

[0013] Further, the double-layer track beam includes a side support. An upper guide beam is fixedly installed at the top of the side support, a lower guide beam is fixedly installed at the bottom of the side support, and connecting plates are fixedly installed at the front and rear ends of the side support. Adjacent double-layer track beams are spliced and installed through the connecting plates.

[0014] Further, the hoisting mechanism includes a sliding seat. The sliding seat is slidably installed on the upper layer of the double-layer track beam. Hoisting machines are fixedly installed at both ends of the top of the sliding seat. A guide wheel is rotatably installed on one side of the hoisting machine through a mounting frame. A lifting rope is wound around the hoisting machine, and one end of the lifting rope extends downward from the sliding seat after passing through the guide wheel.

[0015] Further, the opening and disconnecting connecting shaft includes a lower connecting shaft, an upper connecting shaft, a telescopic shaft, a driving rack, and a telescopic driving component. The lower connecting shaft is fixedly installed on the top surface of the load platform. A telescopic sliding hole is provided in the lower connecting shaft, and the telescopic shaft is installed in the telescopic sliding hole through the telescopic driving component;

[0016] The upper connecting shaft is fixedly installed on the bottom surface of the hoisting mechanism, and the upper connecting shaft is arranged directly above the lower connecting shaft. A jack is provided at the bottom end of the upper connecting shaft, and the upper end of the telescopic shaft is slidably inserted into the jack;

[0017] The driving rack is fixedly installed on the inner side surface of the double-layer track beam, and the driving rack is located in front of the reinforcing cross bar. When the opening and disconnecting connecting shaft drives the telescopic driving component to pass through the position of the driving rack, the telescopic driving component drives the telescopic shaft to move and contract into the telescopic sliding hole under the transmission of the driving rack.

[0018] Further, the telescopic driving component includes a sleeve, a transmission shaft, and a lifting rack. The transmission shaft is rotatably installed on the outer wall of the lower connecting shaft, and a transmission gear tangent to the driving rack is fixedly installed at one end of the transmission shaft;

[0019] The lifting rack is fixedly installed at the bottom end of the telescopic shaft, and transmission teeth are provided at both ends of the lifting rack;

[0020] There are two sleeves, and the two sleeves are symmetrically distributed on both sides of the lifting rack. The sleeves are fixedly installed on the lower connecting shaft. A rotating shaft is rotatably installed in the sleeve. A first driven gear meshing and drivingly connected with the transmission gear is fixedly installed at the outer end of the rotating shaft, and a second driven gear meshing and drivingly connected with the lifting rack is fixedly installed at the inner end of the rotating shaft.

[0021] Further, a lifting slide plate is fixedly installed at the bottom end of the lifting rack. The lifting slide plate is slidably installed in the telescopic sliding hole, and a spring is abutted and installed at the bottom of the lifting slide plate;

[0022] A limiting ring located below the second driven gear is fixedly installed inside the telescopic sliding hole.

[0023] Further, a suspension rod is fixedly installed on the bottom surface of the load platform;

[0024] Anchoring bolts are threadedly installed on both sides of the load platform, and the lower ends of the anchoring bolts are anchored and connected to the lower ends of the double-layer track beam.

[0025] The present invention has the following beneficial effects:

[0026] 1. In the present invention, the track beams can be continuously spliced at the end of the track beam to extend the overall length of the track beam, so that the end of the track beam is always flush with the end of the bridge steel beam section. At the same time, the lifting mechanism moves along the track beam towards the end of the steel beam section, facilitating the lifting mechanism to hoist the steel box girder and continue the splicing construction of the steel beam section. Thus, during the cantilever splicing construction of the bridge steel beam section, it is not necessary to move the entire crane forward by one beam section every time a beam section is hoisted, reducing the bearing pressure at the end of the steel beam section, preventing excessive deflection due to excessive bearing at the end of the steel beam section and making it inconvenient for linear control, and improving the quality of bridge splicing construction. Moreover, a support frame supporting the bridge deck is installed at the bottom of each track beam, which can support the spliced track beam, thereby improving the stability of the track beam installation and the stability during the lifting operation of the lifting mechanism. And the weight of the crane is dispersed to the bridge deck through multiple support frames, making the bridge stress dispersed, preventing the bridge support point from being squeezed and deformed due to excessive stress at a single support point, and further reducing the impact of the crane gravity on the cantilever splicing construction of the bridge.

[0027] 2. In the present invention, a load platform is also slidably installed on the lower layer of the track beam, and the load platform is fixedly connected to the lifting mechanism through a breakable connecting shaft. By pushing the load platform, the lifting mechanism can be driven to move synchronously on the track beam, making the movement of the lifting mechanism more convenient. At the same time, profiles required for splicing the track beam can be placed on the load platform, and it can also be used as a construction platform, thus facilitating the transportation of profiles and the splicing and installation of the track beam, improving the splicing and installation efficiency of the track beam, and further improving the cantilever splicing efficiency of the bridge.

[0028] 3. In the present invention, when the front breakable connecting shaft moves with the load platform and passes through the reinforcement cross bar, the front breakable connecting shaft contracts and disconnects, so as to avoid the reinforcement cross bar and prevent interference between the connecting shaft and the reinforcement cross bar from affecting the normal forward movement of the load platform. The rear breakable connecting shaft remains connected to the lifting mechanism, thus driving the lifting mechanism to move synchronously. Correspondingly, when the rear breakable connecting shaft moves with the load platform and passes through the reinforcement cross bar, the rear breakable connecting shaft contracts and disconnects to avoid the reinforcement cross bar, while the front breakable connecting shaft resumes its connection state with the lifting mechanism and continues to drive the lifting mechanism to move synchronously. By setting two sets of front and rear breakable connecting shafts to connect the load platform and the lifting mechanism, not only can the load platform and the lifting mechanism move synchronously on the track beam, but also the reinforcement cross bar in the track beam can be avoided, ensuring the normal movement of the load platform and the lifting mechanism.

[0029] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. Description of the Drawings

[0030] To more clearly illustrate the technical solutions of the embodiments of the invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0031] Figure 1 Schematic three-dimensional structure diagram during the suspended casting construction of the crane of the present invention;

[0032] Figure 2 Schematic three-dimensional structure diagram during the suspended assembly construction of the crane of the present invention;

[0033] Figure 3 Schematic three-dimensional structure diagram of the double-layer track beam of the present invention;

[0034] Figure 4 For the present invention Figure 3 Schematic diagram of the partial enlarged structure at location A;

[0035] Figure 5 Schematic diagram of the three-dimensional sectional structure of the double-layer track beam of the present invention;

[0036] Figure 6 For the present invention Figure 5 Schematic diagram of the partial enlarged structure at location B;

[0037] Figure 7 Schematic diagram of the three-dimensional sectional structure of the break-type connecting shaft of the present invention;

[0038] Figure 8 Schematic diagram of the structure of the crane during the two-way suspended assembly construction of the bridge of the present invention.

[0039] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0040] 100, concrete beam segment; 200, hanging basket; 300, steel box girder segment;

[0041] 1. Suspension bracket; 11. Slide rail; 12. Sliding frame; 13. Anchoring seat; 2. Double-layer track beam; 21. Side bracket; 22. Upper guide beam; 23. Lower guide beam; 24. Connecting plate; 3. Lifting mechanism; 31. Sliding seat; 32. Winch; 33. Suspension rope; 34. Guide pulley; 4. Load platform; 5. Disconnecting type connecting shaft; 51. Lower connecting shaft; 52. Upper connecting shaft; 53. Telescopic shaft; 54. Driving rack; 55. Transmission gear; 56. Sleeve; 57. Rotating shaft; 58. First-stage driven gear; 59. Second-stage driven gear; 510. Transmission shaft; 511. Jack hole; 512. Telescopic sliding hole; 513. Lifting rack; 514. Lifting slide plate; 515. Spring; 516. Limit ring; 6. Reinforcing cross bar; 7. Support frame; 8. Suspension rod; 9. Anchoring bolt. Detailed implementation manner

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the invention with reference to the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the invention.

[0043] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "top", "middle", "inner", etc. indicating the orientation or position relationship are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0044] Please refer to Figure 1 、 Figure 2 、 Figure 8As shown in the figure, the present invention is a cantilever casting and cantilever erection combined crane for a steel-concrete hybrid variable cross-section continuous box girder bridge, including a suspension support 1. At the top of the suspension support 1, two double-layer track beams 2 arranged oppositely and distributed in parallel are fixedly installed. At the ends of the two double-layer track beams 2, multiple double-layer track beams 2 are continuously spliced. A reinforcing cross bar 6 is fixedly installed between each pair of opposite double-layer track beams 2. At the bottom end of each double-layer track beam 2, a support frame 7 is fixedly installed; a lifting mechanism 3 is slidably installed on the upper layer of the double-layer track beam 2, and a load platform 4 is slidably installed on the lower layer of the double-layer track beam 2. A breakable connecting shaft 5 is fixedly installed between the lifting mechanism 3 and the load platform 4. When the load platform 4 slides along the lower layer of the double-layer track beam 2, the load platform 4 drives the lifting mechanism 3 to slide synchronously on the upper layer of the double-layer track beam 2 through the breakable connecting shaft 5; the breakable connecting shaft 5 can contract and disconnect at the height of the reinforcing cross bar 6; there are two groups of breakable connecting shafts 5, and the two groups of breakable connecting shafts 5 are respectively fixedly installed on the front and rear sides of the load platform 4; when the front breakable connecting shaft 5 moves past the reinforcing cross bar 6 along with the load platform 4, the front breakable connecting shaft 5 contracts and disconnects, while the rear breakable connecting shaft 5 remains connected; when the rear breakable connecting shaft 5 moves past the reinforcing cross bar 6 along with the load platform 4, the rear breakable connecting shaft 5 contracts and disconnects, while the front breakable connecting shaft 5 resumes the connection state;

[0045] Among them, the suspension support 1 is anchored and installed at the end of the concrete beam segment 100 on the steel-concrete hybrid variable cross-section continuous box girder bridge. When the cantilever casting construction of the concrete beam segment 100 is carried out, a hanging basket 200 is suspended and installed on the lifting mechanism 3, and the hanging basket 200 is suspended and spliced at the end of the concrete beam segment 100 through the lifting mechanism 3. Then, concrete is poured in the hanging basket 200. After the poured concrete solidifies and forms, a new concrete beam segment 100 is formed; then, the hanging basket 200 is lowered through the lifting mechanism 3, so that the hanging basket 200 is separated from the formed concrete beam segment 100, and the anchoring of the suspension support 1 on the bridge deck is released. Then, the suspension support 1 is moved along the bridge deck onto the newly poured concrete beam segment 100, thereby driving the hanging basket 200 to move. Then, the above-mentioned pouring steps are repeated to carry out the pouring of the next beam segment, and so on, until all the concrete beam segments 100 on the steel-concrete hybrid variable cross-section continuous box girder bridge are poured;

[0046] Then, the cantilever erection construction of the steel box girder segment 300 is carried out. During the cantilever erection construction, first, the double-deck track beam 2 and the reinforcement cross bar 6 to be installed are placed on the load platform 4. Then, the staff is on the load platform 4, and a new double-deck track beam 2 is spliced and installed again at the right end of the existing double-deck track beam 2 at the top of the suspension bracket 1, so that the end of the double-deck track beam 2 extends to the outside of the bridge. Then, the load platform 4 is pushed to move along the lower layer of the double-deck track beam 2 towards the end of the double-deck track beam 2. At the same time, the load platform 4 drives the hoisting mechanism 3 to slide synchronously on the upper layer of the double-deck track beam 2 through the breakable connecting shaft 5, so that the hoisting mechanism 3 moves synchronously to the end of the double-deck track beam 2, and further makes the hoisting mechanism 3 protrude to the outside of the bridge end. Then, the steel box girder segment 300 under the bridge is lifted upwards by the hoisting mechanism 3. When the steel box girder segment 300 is lifted to the height of the bridge, the steel box girder segment 300 is spliced with the bridge end, and the bridge end and the steel box girder segment 300 are welded and fixed, thus completing the splicing and installation of this section of the steel box girder segment 300. After that, the above processes of splicing and installation of the double-deck track beam 2 and the movement and hoisting of the hoisting mechanism 3 are repeated, and the cantilever erection construction of the next section of the steel box girder segment 300 is continued until the cantilever erection construction of all the steel box girder segments 300 is completed.

[0047] In this embodiment, through the cooperation of the suspension bracket 1, the double-deck track beam 2, the hoisting mechanism 3 and the load platform 4, the crane of the present invention can not only carry out the cantilever casting construction of the bridge, but also carry out the cantilever erection construction of the bridge, so that there is no need to replace the crane during the cantilever erection construction, making the bridge construction more convenient. Moreover, the hoisting mechanism 3 is movably installed on the spliced double-deck track beam 2, and the position of the hoisting mechanism 3 can be adjusted by moving the double-deck track beam 2, rather than moving the whole crane forward by one beam segment every time a beam segment is hoisted during the cantilever erection construction, which reduces the bearing pressure at the end of the steel beam segment, prevents excessive deflection of the end of the steel beam segment due to excessive bearing, and is not conducive to the linear control, and can improve the quality of the bridge splicing construction.

[0048] Furthermore, a reinforcing cross bar 6 is fixedly installed between each pair of opposite double-layer track beams 2 to reinforce the spliced double-layer track beams 2 through the reinforcing cross bar 6 and improve the stability of the double-layer track beams 2. When the front openable connecting shaft 5 moves past the reinforcing cross bar 6 along with the load platform 4, the front openable connecting shaft 5 contracts and disconnects, thereby avoiding the reinforcing cross bar 6 to prevent interference between the openable connecting shaft 5 and the reinforcing cross bar 6 from affecting the normal forward movement of the load platform 4. The rear openable connecting shaft 5 maintains the connection state with the hoisting mechanism 3 and drives the hoisting mechanism 3 to move synchronously. Correspondingly, when the rear openable connecting shaft 5 moves past the reinforcing cross bar 6 along with the load platform 4, the rear openable connecting shaft 5 contracts and disconnects to avoid the reinforcing cross bar 6, while the front openable connecting shaft 5 resumes the connection state with the hoisting mechanism 3 and continues to drive the hoisting mechanism 3 to move synchronously. By providing two sets of front and rear openable connecting shafts 5 to connect the load platform 4 and the hoisting mechanism 3, not only can the load platform 4 and the hoisting mechanism 3 move synchronously on the double-layer track beams 2, but also the reinforcing cross bar 6 can be avoided to ensure the normal movement of the load platform 4 and the hoisting mechanism 3.

[0049] At the bottom of each double-layer track beam 2, a support frame 7 that supports the bridge deck is installed. The support frame 7 can support the spliced double-layer track beams 2, thereby improving the installation stability of the double-layer track beams 2 and the stability during the hoisting operation of the hoisting mechanism 3. Moreover, the weight of the crane is dispersed to various parts of the bridge deck through multiple support frames 7, so that the stress of the bridge is dispersed, preventing the single-point support from causing excessive stress on the bridge support point and being squeezed and deformed, and further reducing the influence of the crane gravity on the suspended segment construction of the bridge.

[0050] Please refer to Figure 1 As shown in the figure, in one embodiment, the suspension bracket 1 includes a slide rail 11 and a sliding frame 12. The sliding frame 12 is slidably installed on the slide rail 11, and an anchoring seat 13 is fixedly installed on the sliding frame 12. Among them, the slide rail 11 is fixedly installed on the top surface of the concrete beam segment 100, and the sliding frame 12 is fixedly slidably installed on the slide rail 11 and is fixedly connected to the concrete beam segment 100 through the anchoring seat 13 to ensure the installation stability of the sliding frame 12. When it is necessary to move the hoisting mechanism 3 to perform the cantilever casting construction of the next concrete beam segment 100, first, a new slide rail 11 is spliced and installed at the right end of the slide rail 11, and the anchoring between the anchoring seat 13 and the concrete beam segment 100 is released. Then, the sliding frame 12 is moved to the right on the slide rail 11, thereby driving the double-layer track beam 2 and the hoisting mechanism 3 at its top to move to the right.

[0051] Please refer to Figure 3As shown, in one embodiment, the double-layer track beam 2 includes side brackets 21. An upper guide beam 22 is fixedly installed at the top of the side brackets 21, and a lower guide beam 23 is fixedly installed at the bottom of the side brackets 21. Connecting plates 24 are fixedly installed at both the front and rear ends of the side brackets 21. Adjacent double-layer track beams 2 are spliced and installed through the connecting plates 24. Multiple evenly arranged connection holes are provided on the connecting plates 24. When adjacent double-layer track beams 2 are spliced and connected, the connecting plates 24 at the ends of the adjacent double-layer track beams 2 are attached, and then the two connecting plates 24 are locked and fixed by the cooperation of bolts and nuts, so as to complete the fixed connection between the two double-layer track beams 2. At this time, the upper guide beams 22 and the lower guide beams 23 between the adjacent double-layer track beams 2 are respectively spliced and connected to extend the length of the guide beam.

[0052] Please refer to Figures 1 - 3 As shown, in one embodiment, the hoisting mechanism 3 includes a sliding seat 31. The sliding seat 31 is slidably installed on the upper layer of the double-layer track beam 2. Hoisting winches 32 are fixedly installed at both ends of the top of the sliding seat 31. A guide wheel 34 is rotatably installed on one side of the hoisting winch 32 through a mounting frame. A hoisting rope 33 is wound around the hoisting winch 32. One end of the hoisting rope 33 extends downward from the sliding seat 31 after passing through the guide wheel 34. Among them, the guide wheel 34 is used to guide and limit the hoisting rope 33. The hoisting winch 32 is a double-spool hoisting winch, and two hoisting ropes 33 are wound around each hoisting winch 32, so that the two hoisting winches 32 can extend four hoisting ropes 33 to suspend the hanging basket 200 or the steel box girder section 300, so as to improve the stability of the hanging basket 200 and the steel box girder section 300 during suspension.

[0053] Please refer to Figure 3 、 Figure 4 、 Figure 7 As shown, in one embodiment, the breakable connecting shaft 5 includes a lower connecting shaft 51, an upper connecting shaft 52, a telescopic shaft 53, a driving rack 54 and a telescopic driving assembly. The lower connecting shaft 51 is fixedly installed on the top surface of the load platform 4. A telescopic sliding hole 512 is opened in the lower connecting shaft 51. The telescopic shaft 53 is installed in the telescopic sliding hole 512 through the telescopic driving assembly. The upper connecting shaft 52 is fixedly installed on the bottom surface of the hoisting mechanism 3, and the upper connecting shaft 52 is arranged directly above the lower connecting shaft 51. A jack 511 is opened at the bottom end of the upper connecting shaft 52. The upper end of the telescopic shaft 53 is slidably inserted into the jack 511. The driving rack 54 is fixedly installed on the inner side surface of the double-layer track beam 2, and the driving rack 54 is located in front of the reinforcing cross bar 6. When the breakable connecting shaft 5 drives the telescopic driving assembly to pass through the position of the driving rack 54, the telescopic driving assembly drives the telescopic shaft 53 to move and contract into the telescopic sliding hole 512 under the transmission of the driving rack 54.

[0054] When the on-off connecting shaft 5 moves with the loading platform 4 to the front side of the reinforcing cross bar 6, the lower connecting shaft 51 drives the telescopic driving assembly to pass the position of the driving rack 54. At this time, the telescopic driving assembly drives the telescopic shaft 53 to move and shrink into the telescopic sliding hole 512 under the transmission of the driving rack 54, so that the top end of the telescopic shaft 53 is pulled out from the socket 511 and gradually shrinks into the telescopic sliding hole 512, thereby making the lower connecting shaft 51 and the upper connecting shaft 52 disconnected, and the size of the fracture between the lower connecting shaft 51 and the upper connecting shaft 52 is larger than the height of the reinforcing cross bar 6, so that the on-off connecting shaft 5 avoids the reinforcing cross bar 6 when passing the position of the reinforcing cross bar 6, ensuring that the on-off connecting shaft 5 and the loading platform 4 can pass through the reinforcing cross bar 6 normally.

[0055] See also Figures 4 - 7 As shown, in one embodiment, the telescopic drive assembly includes a sleeve 56, a transmission shaft 510 and a lifting rack 513. The transmission shaft 510 is rotatably mounted on the outer wall of the lower connecting shaft 51, and one end of the transmission shaft 510 is fixedly mounted with a transmission gear 55 tangential to the driving rack 54; the lifting rack 513 is fixedly mounted on the bottom end of the telescopic shaft 53, and transmission teeth are provided at both ends of the lifting rack 513; there are two sleeves 56, and the two sleeves 56 are symmetrically distributed on both sides of the lifting rack 513, and the sleeve 56 is fixedly mounted on the lower connecting shaft 51, and a rotating shaft 57 is rotatably mounted in the sleeve 56, and the outer end of the rotating shaft 57 is fixedly mounted with a primary driven gear 58 meshing with the transmission gear 55 for transmission connection, and the inner end of the rotating shaft 57 is fixedly mounted with a secondary driven gear 59 meshing with the lifting rack 513 for transmission connection;

[0056] When the lower connecting shaft 51 moves to the front side of the reinforcing cross bar 6, the lower connecting shaft 51 drives the transmission gear 55 to engage and transmit the connection with the driving rack 54. Then, as the lower connecting shaft 51 and the transmission gear 55 continue to move, the driving rack 54 engages and drives the transmission gear 55 to rotate, so that the transmission gear 55 engages and drives the first-level driven gear 58 to rotate, and then the first-level driven gear 58 drives the rotating shaft 57 and the second-level driven gear 59 to rotate. When the second-level driven gear 59 rotates, it engages and drives the lifting rack 513 to move downward, and then the lifting rack 513 drives the telescopic shaft 53 to move downward, so that the telescopic shaft 53 gradually retracts into the telescopic sliding hole 512.

[0057] See also Figures 5 - 7As shown, in one embodiment, a lifting slide plate 514 is fixedly installed at the bottom end of the lifting rack 513. The lifting slide plate 514 is slidably installed in the telescopic slide hole 512, and a spring 515 is abutted and installed at the bottom of the lifting slide plate 514. A limiting ring 516 located below the secondary driven gear 59 is fixedly installed inside the telescopic slide hole 512. When the lifting rack 513 moves downward, it drives the lifting slide plate 514 to move downward synchronously. At this time, the spring 515 is compressed by the lifting slide plate 514 to generate a reset elastic force. When the lower connecting shaft 51 moves past the reinforcing cross bar 6, the transmission gear 55 moves past the driving rack 54 synchronously. At this time, the transmission gear 55 is no longer driven by the driving rack 54. The lifting slide plate 514, the lifting rack 513 and the telescopic shaft 53 move upward to reset under the action of the reset elastic force of the spring 515, so that the top end of the telescopic shaft 53 is inserted into the jack 511 again, thereby restoring the connection state between the lower connecting shaft 51 and the upper connecting shaft 52.

[0058] Please refer to Figures 2 - 4 As shown, in one embodiment, a suspension rod 8 is fixedly installed on the bottom surface of the load platform 4. Anchor bolts 9 are threadedly installed on both sides of the load platform 4, and the lower ends of the anchor bolts 9 are fixedly connected to the lower ends of the double-layer track beam 2. The bottom of the suspension rod 8 extends near the bridge deck. When the steel box girder segment 300 is suspended and spliced at the end of the bridge, the bottom of the suspension rod 8 is fixedly connected to the top surface of the steel box girder segment 300, which can improve the stability of the steel box girder segment 300, so that the docking between the steel box girder segment 300 and the bridge end is more stable, facilitating the subsequent welding connection between the steel box girder segment 300 and the bridge end. And when it is necessary to move the load platform 4 after the steel box girder segment 300 is welded, the anchoring between the bottom end of the suspension rod 8 and the bridge deck is released. Then, the staff can stand on the bridge deck and push the suspension rod 8, and then the suspension rod 8 drives the upper load platform 4 to move, making the movement of the load platform 4 more convenient. The anchor bolt 9 can anchor and install the load platform 4 on the double-layer track beam 2 during the cantilever splicing construction of the steel box girder segment 300. At the same time, the hoisting mechanism 3 is synchronously fixed on the double-layer track beam 2 through the connection of the breakable connecting shaft 5, preventing the load platform 4 and the hoisting mechanism 3 from sliding and shifting on the double-layer track beam 2 during the cantilever splicing construction, improving the stability and safety during construction. When it is necessary to move the load platform 4 and the hoisting mechanism 3, rotate and remove the anchor bolt 9 to release the locking of the load platform 4 and the hoisting mechanism 3 at the same time.

[0059] Usage method:

[0060] First, the suspension bracket 1 is anchored and installed at the end of the concrete beam segment 100 on the steel-concrete hybrid variable cross-section continuous box girder bridge. When the cantilever casting construction of the concrete beam segment 100 is carried out, the hanging basket 200 is suspended and installed on the hoisting mechanism 3, and the hanging basket 200 is hung and spliced at the end of the concrete beam segment 100 through the hoisting mechanism 3. Then, concrete is poured in the hanging basket 200. After the poured concrete solidifies and takes shape, a new concrete beam segment 100 is formed. Then, the hanging basket 200 is lowered through the hoisting mechanism 3, so that the hanging basket 200 is separated from the formed concrete beam segment 100, and the anchorage of the suspension bracket 1 on the bridge deck is released. Then, the suspension bracket 1 is moved along the bridge deck to the newly poured concrete beam segment 100, thereby driving the hanging basket 200 to move. Then, the above pouring steps are repeated to carry out the pouring of the next beam segment, and so on, until all the concrete beam segments 100 on the steel-concrete hybrid variable cross-section continuous box girder bridge are poured and completed;

[0061] Then, the cantilever splicing construction of the steel box girder segment 300 is carried out. During the cantilever splicing construction, first, the double-layer track beam 2 and the reinforcement cross bar 6 to be installed are placed on the load-carrying platform 4. Then, the staff is on the load-carrying platform 4 to splice and install a new double-layer track beam 2 at the right end of the existing double-layer track beam 2 at the top of the suspension bracket 1, so that the end of the double-layer track beam 2 extends to the outside of the bridge. At the same time, the reinforcement cross bar 6 is installed between the two relatively arranged double-layer track beams 2. Then, the load-carrying platform 4 is pushed to move the load-carrying platform 4 along the lower layer of the double-layer track beam 2 to the end of the double-layer track beam 2. At the same time, the load-carrying platform 4 drives the hoisting mechanism 3 to slide synchronously on the upper layer of the double-layer track beam 2 through the breakable connecting shaft 5, so that the hoisting mechanism 3 moves synchronously to the end of the double-layer track beam 2, and then the hoisting mechanism 3 protrudes to the outside of the bridge end. Then, the steel box girder segment 300 under the bridge is lifted upward through the hoisting mechanism 3. When the steel box girder segment 300 is lifted to the height of the bridge, the steel box girder segment 300 is spliced with the bridge end, and the bridge end and the steel box girder segment 300 are welded and fixed, so as to complete the splicing and installation of this section of the steel box girder segment 300. Then, the above splicing and installation of the double-layer track beam 2 and the moving and lifting process of the hoisting mechanism 3 are repeated to continue the cantilever splicing construction of the next section of the steel box girder segment 300 until all the cantilever splicing constructions of the steel box girder segments 300 are completed;

[0062] When the breakable connecting shaft 5 moves to the front side of the reinforcement cross bar 6 along with the load platform 4, the lower connecting shaft 51 drives the telescopic driving assembly to pass through the position of the driving rack 54. At this time, the telescopic driving assembly drives the telescopic shaft 53 to move and contract into the telescopic slide hole 512 under the transmission of the driving rack 54, so that the top end of the telescopic shaft 53 is withdrawn from the jack 511 and gradually contracts into the telescopic slide hole 512. Furthermore, the lower connecting shaft 51 and the upper connecting shaft 52 are in a disconnected state, and the size of the break between the lower connecting shaft 51 and the upper connecting shaft 52 is greater than the height of the reinforcement cross bar 6, so that the breakable connecting shaft 5 avoids the reinforcement cross bar 6 when passing through the position of the reinforcement cross bar 6, ensuring that the breakable connecting shaft 5 and the load platform 4 can pass through the reinforcement cross bar 6 normally.

[0063] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0064] The preferred embodiments of the invention disclosed above are only used to help explain the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the invention, so that those skilled in the art in the relevant technical field can understand and utilize the invention well.

Claims

1. A suspension casting and suspension erection combined crane for a steel-concrete hybrid variable cross-section continuous box girder bridge, comprising a suspension support (1), characterized in that: At the top of the suspension bracket (1), two double-layer track beams (2) are fixedly installed, which are arranged oppositely and distributed in parallel. At the ends of the two double-layer track beams (2), a plurality of double-layer track beams (2) are continuously spliced. A reinforcing cross bar (6) is fixedly installed between each pair of opposite double-layer track beams (2). At the bottom of each double-layer track beam (2), a support frame (7) is fixedly installed; A hoisting mechanism (3) is slidably installed on the upper layer of the double-layer track beam (2), and a load platform (4) is slidably installed on the lower layer of the double-layer track beam (2). An openable connecting shaft (5) is fixedly installed between the hoisting mechanism (3) and the load platform (4). When the load platform (4) slides along the lower layer of the double-layer track beam (2), the load platform (4) drives the hoisting mechanism (3) to slide synchronously on the upper layer of the double-layer track beam (2) through the openable connecting shaft (5); The openable connecting shaft (5) can contract and disconnect at the height of the reinforcing cross bar (6); There are two groups of the openable connecting shafts (5), and the two groups of openable connecting shafts (5) are respectively fixedly installed on the front and rear sides of the load platform (4); When the front openable connecting shaft (5) moves with the load platform (4) past the reinforcing cross bar (6), the front openable connecting shaft (5) contracts and disconnects, while the rear openable connecting shaft (5) remains connected; When the rear openable connecting shaft (5) moves with the load platform (4) past the reinforcing cross bar (6), the rear openable connecting shaft (5) contracts and disconnects, while the front openable connecting shaft (5) resumes the connected state.

2. The cantilever casting and cantilever erection combined crane for a steel-concrete hybrid variable cross-section continuous box girder bridge according to claim 1, characterized in that: The suspension bracket (1) includes a slide rail (11) and a sliding frame (12). The sliding frame (12) is slidably installed on the slide rail (11), and an anchoring seat (13) is fixedly installed on the sliding frame (12); The slide rail (11) is fixedly installed on the top surface of the concrete beam section (100). The sliding frame (12) is fixedly and slidably installed on the slide rail (11) and is anchored to the concrete beam section (100) through the anchoring seat (13); When it is necessary to move the hoisting mechanism (3) for the cantilever casting construction of the next concrete beam section (100), first, a new slide rail (11) is spliced and installed at the right end of the slide rail (11), and the anchoring between the anchoring seat (13) and the concrete beam section (100) is released. Then, the sliding frame (12) is moved to the right on the slide rail (11), so as to drive the double-layer track beam (2) and the hoisting mechanism (3) at its top to move to the right through the sliding frame (12).

3. A combined cantilever casting and cantilever erection crane for a steel-concrete hybrid variable cross-section continuous box girder bridge according to claim 2, characterized in that: The double-layer track beam (2) includes a side support (21). At the top of the side support (21), an upper guide beam (22) is fixedly installed. At the bottom of the side support (21), a lower guide beam (23) is fixedly installed. Connecting plates (24) are fixedly installed at the front and rear ends of the side support (21). Adjacent double-layer track beams (2) are spliced and installed through the connecting plates (24); The connecting plate (24) is provided with a plurality of connecting holes evenly arranged and distributed. When adjacent double-layer track beams (2) are spliced and connected, the connecting plates (24) at the ends of the adjacent double-layer track beams (2) are fitted together, and then the two connecting plates (24) are locked and fixed by the cooperation of bolts and nuts.

4. A combined cantilever casting and cantilever erection crane for a steel-concrete hybrid variable cross-section continuous box girder bridge according to claim 3, characterized in that: The lifting mechanism (3) includes a sliding seat (31) which is slidably installed on the upper layer of the double-layer track beam (2). Both ends of the top of the sliding seat (31) are fixedly installed with hoists (32). One side of each hoist (32) is rotatably installed with a guide wheel (34) through a mounting frame. A lifting rope (33) is wound around the hoist (32), and one end of the lifting rope (33) extends downward below the sliding seat (31) after passing through the guide wheel (34).

5. A combined cantilever casting and cantilever erection crane for a steel-concrete hybrid variable cross-section continuous box girder bridge according to claim 3, characterized in that: The disconnecting connecting shaft (5) includes a lower connecting shaft (51), an upper connecting shaft (52), a telescopic shaft (53), a driving rack (54) and a telescopic driving assembly. The lower connecting shaft (51) is fixedly installed on the top surface of the load platform (4). A telescopic sliding hole (512) is formed in the lower connecting shaft (51), and the telescopic shaft (53) is installed in the telescopic sliding hole (512) through the telescopic driving assembly. The upper connecting shaft (52) is fixedly installed on the bottom surface of the lifting mechanism (3), and the upper connecting shaft (52) is arranged directly above the lower connecting shaft (51). A jack (511) is formed at the bottom end of the upper connecting shaft (52), and the upper end of the telescopic shaft (53) is slidably inserted into the jack (511). The driving rack (54) is fixedly installed on the inner side surface of the double-layer track beam (2), and the driving rack (54) is located on the front side of the reinforcing cross bar (6). When the disconnecting connecting shaft (5) drives the telescopic driving assembly to pass through the position of the driving rack (54), the telescopic driving assembly drives the telescopic shaft (53) to move and contract into the telescopic sliding hole (512) under the transmission of the driving rack (54). The lower connecting shaft (51) drives the telescopic driving assembly to pass through the position of the driving rack (54). At this time, the telescopic driving assembly drives the telescopic shaft (53) to move and contract into the telescopic sliding hole (512) under the transmission of the driving rack (54), so that the top end of the telescopic shaft (53) is withdrawn from the jack (511).

6. A combined cantilever casting and cantilever erection crane for a steel-concrete hybrid variable cross-section continuous box girder bridge according to claim 5, characterized in that: The telescopic driving assembly includes a sleeve (56), a transmission shaft (510) and a lifting rack (513). The transmission shaft (510) is rotatably installed on the outer wall of the lower connecting shaft (51). One end of the transmission shaft (510) is fixedly installed with a transmission gear (55) tangent to the driving rack (54). The lifting rack (513) is fixedly installed at the bottom end of the telescopic shaft (53), and transmission teeth are arranged at both ends of the lifting rack (513). There are two of the sleeves (56), and the two sleeves (56) are symmetrically distributed on both sides of the lifting rack (513). The sleeves (56) are fixedly installed on the lower connecting shaft (51). A rotating shaft (57) is rotatably installed in the sleeve (56). A first-stage driven gear (58) that is meshed and drivingly connected to the transmission gear (55) is fixedly installed at the outer end of the rotating shaft (57). A second-stage driven gear (59) that is meshed and drivingly connected to the lifting rack (513) is fixedly installed at the inner end of the rotating shaft (57). When the second-stage driven gear (59) rotates, it meshes and drives the lifting rack (513) to move downward. Then, the lifting rack (513) drives the telescopic shaft (53) to move downward, causing the telescopic shaft (53) to gradually retract into the telescopic slide hole (512).

7. A combined cantilever casting and cantilever erection crane for a steel-concrete hybrid variable cross-section continuous box girder bridge according to claim 6, characterized in that: A lifting slide plate (514) is fixedly installed at the bottom end of the lifting rack (513). The lifting slide plate (514) is slidably installed in the telescopic slide hole (512). A spring (515) is abutted and installed at the bottom of the lifting slide plate (514). A limiting ring (516) located below the second-stage driven gear (59) is fixedly installed inside the telescopic slide hole (512).

8. A combined cantilever casting and cantilever erection crane for a steel-concrete hybrid variable cross-section continuous box girder bridge according to claim 7, characterized in that: A suspension rod (8) is fixedly installed on the bottom surface of the load platform (4). Anchoring bolts (9) are threadedly installed on both sides of the load platform (4). The lower ends of the anchoring bolts (9) are fixedly connected to the lower ends of the double-layer track beams (2).

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