A steel-concrete hybrid variable cross-section continuous box girder bridge cantilever casting and cantilever splicing combined crane with good supporting effect

Abstract

This invention discloses a combined cantilever and splice crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect. It relates to the field of cranes and includes a support frame and a crane body mounted on the support frame. Support rods are installed on the support frame and are movable. Fixing components are installed on the support rods to secure them to the support frame. During movement, the fixing components release the support rods. A load-bearing component is also installed on the support frame. This design allows one end of the completed bridge segment to be supported by a pier, and the other end by the support rod, reducing linear deformation and stress damage caused by excessive stress on the completed bridge segment under its own weight. The support unit transfers the force of the support rod to the support frame, improving the load-bearing capacity of the support rod. A locking unit locks the support rod to the support frame, ensuring its stability under load and preventing displacement or detachment from the support frame, thus ensuring structural safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of cranes, and in particular to a combined cantilever and splice crane for steel-concrete hybrid variable cross-section continuous box girder bridges with good support performance. Background Technology

[0002] Steel-concrete composite continuous beam bridges replace the concrete beams bearing positive bending moments at mid-span with steel box girders, while the side spans or portions extending into the mid-span utilize concrete beams with greater self-weight and stiffness. The compressive weight of the concrete beams reduces the internal forces and deformations of the main span, resulting in a more rational distribution of bending moments. This not only reduces the deflection of the main span steel box girder but also avoids the mid-span cracking problem associated with single concrete beams. This bridge type fully utilizes the superior properties of both steel and concrete, offering a degree of economic efficiency. Variable cross-section beams: beams with larger cross-sections where bending moments are greater and smaller cross-sections where bending moments are less, exhibiting a cross-section variation along the axial direction, are called variable cross-section beams.

[0003] The construction of the mid-span steel main girder of a long-span variable cross-section hybrid continuous box girder bridge can be carried out by either large-segment integral hoisting or small-segment cantilever erection. When constructing a long-span variable cross-section hybrid continuous box girder bridge using the small-segment cantilever erection method, the concrete main girder portion is typically constructed using conventional cantilever casting with a hanging basket, and the mid-span steel girder segment is erected using a bridge deck crane. The process of cantilever casting of the concrete girder segment involves anchoring the rear anchor point of the hanging basket to the completed girder segment, using the front end of the hanging basket as a support for the formwork, binding reinforcing bars, laying prestressed ducts, pouring concrete, and tensioning prestressing inside the hanging basket to complete the construction of a standard girder segment; after the concrete strength reaches the design value, the hanging basket is moved forward one segment, and the construction of the next segment begins. The process of suspending and assembling steel beam segments using a bridge deck crane involves anchoring the bridge deck crane onto the completed beam segment, using the lifting equipment at the front end of the bridge deck crane to lift the steel beam segment to the installation position at the end of the completed bridge, accurately positioning and aligning it, and then welding the beam segment to complete the erection; after the steel beam segment is erected, the bridge deck crane is moved forward one section before the erection of the next steel beam segment begins.

[0004] Chinese patent application CN108301331A discloses a bridge deck crane for steel box girder installation and a method for cantilever assembly of steel box girders, including a bridge deck crane traveling mechanism, a main truss, a bridge deck crane lifting mechanism, and a rotating lifting device. The bottom of the main truss is the bridge deck crane traveling mechanism, the upper part of the main truss is the bridge deck crane lifting mechanism, a longitudinal and transverse adjustment mechanism is provided between the main truss and the bridge deck crane lifting mechanism, and a rotating lifting device is provided on the bridge deck crane lifting mechanism.

[0005] The aforementioned patents and prior art also have the following defects:

[0006] Supporting the main body of the crane via cantilever is cumbersome. After installing one section of the steel box girder, the crane needs to be moved to the completed bridge section for the cantilever assembly of the next box girder. Existing technology involves constructing a truss spanning the unconstructed portion of the bridge, mounting a self-propelled crane on the truss, and then hoisting and assembling the box girders. However, as more cantilevered sections of the box girder are installed, the longer the bridge extends beyond the piers. When the extended portion is not closed, the end deformation under its own weight is greater. Excessive end deformation makes it difficult to determine the appropriate width of the splice joint between adjacent beam sections, resulting in "wide welds" between adjacent steel beam sections during construction, posing a safety hazard for the later operation of the structure. For beam sections using bolted connections, excessive deformation directly makes bolting extremely difficult, requiring on-site cutting of splice plates for bolting. This results in long construction periods, high construction risks, and poor economic efficiency. The quality of beam alignment control under deformation is difficult to guarantee, leading to poor beam alignment smoothness and an unsatisfactory overall aesthetic effect after the bridge is completed.

[0007] Therefore, this application provides a combined cantilever and splicing crane for steel-concrete hybrid variable cross-section continuous box girder bridges with good support effect to meet the requirements. Summary of the Invention

[0008] The purpose of this application is to provide a combined cantilever and splice crane for steel-concrete composite variable cross-section continuous box girder bridges with good support effect. This crane allows one end of the completed bridge segment to be supported by a pier, and the other end to be supported by a support rod. This reduces the linear deformation and stress damage caused by excessive stress on the completed bridge segment under its own weight. The support unit transfers the force of the support rod to the support frame, improving the load-bearing capacity of the support rod. The locking unit locks the support rod to the support frame, ensuring the stability of the support rod after being stressed. The support rod is not easy to shift or fall off the support frame after being stressed, thus ensuring the safety and reliability of the structure.

[0009] To achieve the above objectives, this application provides the following technical solution: a combined cantilever and splice crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect, comprising a support frame and a crane body mounted on the support frame, wherein a support rod is mounted on the support frame, the support rod is movable on the support frame, and a fixing component is mounted on the support rod, the fixing component is capable of fixing the support rod on the support frame, and when the support rod moves, the fixing component releases the fixing of the support rod;

[0010] The support frame is provided with a load-bearing component. The fixing component includes a support unit and a locking unit. Both the support unit and the locking unit can be moved onto the load-bearing component to form a locking structure between the locking unit and the load-bearing component, so that the load-bearing component provides support to the support rod through the support unit.

[0011] Preferably, the bearing assembly includes a bearing plate and a plurality of bearing blocks, and the support unit includes two support blocks and a plurality of insertion blocks. The support blocks and the insertion blocks are movable toward the bearing plate, such that the plurality of insertion blocks are respectively inserted between two adjacent bearing blocks. The two support blocks are respectively located at the top and bottom of the corresponding bearing blocks and abut against the corresponding bearing blocks.

[0012] Preferably, the bearing assembly further includes a plurality of threaded holes, which are equidistantly provided on the bearing plate. The locking unit includes a plurality of threaded rods, which are movable toward the bearing plate and are rotatable, and are screwed into the corresponding threaded holes while moving.

[0013] Preferably, the locking unit further includes a plurality of rotating sprockets, a clamping sprocket, and a chain. A connecting plate is fixedly installed on each of the two support blocks. A plurality of threaded rods are rotatably connected to the corresponding connecting plates. A plurality of rotating sprockets are fixedly installed on the corresponding threaded rods. The clamping sprocket is rotatably installed on the connecting plate. The inner ring of the chain meshes with a plurality of rotating sprockets, and the outer ring of the chain meshes with the chain.

[0014] Preferably, the fixing assembly further includes two sliding units. Both support blocks are connected to a fixing plate via corresponding sliding units. The support rod is fixedly mounted on the two fixing plates. The fixing assembly and the fixing plates move on the support frame via a moving assembly. A support cross plate is fixedly mounted on the support frame. Two moving rails are fixedly mounted on the support cross plate. A through hole is provided between the two moving rails on the support cross plate. The moving assembly includes two support wheels, a support rod, a drive gear, a drive rack, a drive shaft, and a moving block. The drive rack is fixedly mounted on the support cross plate. The moving block passes through the through hole. The drive shaft is rotatably connected to the moving block. The drive gear is fixedly sleeved on the drive shaft and meshes with the drive rack. The support rod is rotatably connected to the moving block. Both support wheels are fixedly sleeved on the support rod, and the support wheels abut against their corresponding moving rails.

[0015] Preferably, the sliding unit includes a sliding block, a sliding rod, and a support plate. The support plate is fixedly mounted on the fixed plate, and a stabilizing plate is fixedly mounted on the other end of the support plate. One end of the sliding rod is fixedly mounted on the fixed plate, and the other end of the sliding rod is fixedly mounted on the stabilizing plate. One end of the moving block is fixedly mounted on the support plate, and the sliding block is fixedly mounted on the support block. A sliding hole is provided on the sliding block corresponding to the position of the sliding rod, and the sliding rod passes through the sliding hole and slides in cooperation with the sliding hole.

[0016] Preferably, both the fixing component and the bearing component are provided in two sets, and the two sets of bearing components are respectively mounted on the corresponding support frame. A linear hydraulic rod is provided between the two fixing components, and the linear hydraulic rod can push the support unit and the locking unit to move towards the corresponding bearing component.

[0017] Preferably, a back plate is fixedly installed between the two support blocks, the insertion block is fixedly installed on one side of the back plate, and the two ends of the linear hydraulic rod are respectively fixedly installed on the corresponding back plates.

[0018] Preferably, a linkage component is provided between the two fixed components. When the threaded rod in one of the fixed components rotates, it can drive the threaded rod in the other fixed component to rotate through the linkage component. The linkage component includes two drive rods, a limiting hole, and a limiting telescopic rod. The two drive rods are respectively fixedly installed on corresponding rotating sprockets. The limiting hole is opened at the end of the drive rod away from the rotating sprocket. The cross-section of the limiting hole is rectangular. The cross-section of the limiting telescopic rod is rectangular, and both ends of the limiting telescopic rod are inserted into the corresponding limiting holes and slide in cooperation with the limiting holes.

[0019] Preferably, the support block has two support ramps at one end near the insertion block, and the two support ramps gradually slope from both sides of the support block towards the center until the two support ramps connect with each other. The insertion block has two insertion ramps at one end near the support block, and the two insertion ramps gradually slope from both sides of the insertion block towards the center until the two insertion ramps connect with each other.

[0020] In summary, the technical effects and advantages of this invention are as follows:

[0021] 1. In this invention, by setting up a support frame spanning the bridge, the crane body on the support frame can lift the bridge under construction from multiple positions. The bottom of the crane body can be fixed with a hanging basket to cantilever the concrete section of the bridge, or it can be anchored to the anchor points of the steel structure box girder to lift the steel structure box girder, thereby suspending and assembling the steel structure box girder, which improves its applicability. After the construction of the steel structure box girder is completed, the nearest steel structure box girder is supported by support rods, so that one end of the completed bridge section is supported by the pier and the other end is supported by the support rods, reducing the burden on the constructed section. The completed bridge segment suffers from excessive linear deformation and stress failure due to excessive stress under its own weight, which improves the stability of the bridge segment during construction. The movable support rod facilitates the construction of the next bridge segment. After the support rod is moved to the designated position, the support unit and locking unit move onto the load-bearing component. The support unit transfers the force of the support rod to the support frame, which improves the load-bearing capacity of the support rod. The locking unit locks the support rod to the support frame, ensuring the stability of the support rod after being stressed. The support rod is not easy to shift or fall off the support frame after being stressed, ensuring the safety and reliability of the structure.

[0022] 2. In this invention, by driving the pressure sprocket to rotate, the pressure sprocket drives the chain to move, the chain drives all the pressure sprockets to rotate, and the pressure sprocket drives the corresponding threaded rod to rotate, so that the threaded rod rotates as it moves into the threaded hole, so that the threaded rod can be screwed into the threaded hole and a certain fastening force is applied, which can drive multiple threaded rods to move synchronously, ensuring the synchronicity of the rotation of multiple threaded rods, and preventing the inconsistent depth of screwing into the threaded hole from causing jamming. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a combined cantilever and splicing crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect;

[0025] Figure 2 This is a schematic diagram of the structure of the crane body, support frame, and support rod in this invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged view of section A;

[0027] Figure 4 This is a schematic diagram of the support rod and support frame in this invention;

[0028] Figure 5 for Figure 4 Enlarged view of section B;

[0029] Figure 6 This is a schematic diagram of the structure of the moving component, the crane body, and the support frame in this invention;

[0030] Figure 7 For the present invention Figure 6 Enlarged view of section C;

[0031] Figure 8 This is a schematic diagram of the structure of the moving component, the crane body, and the support rod in this invention;

[0032] Figure 9 This is a schematic diagram of the structure of the supporting component and the moving component in this invention;

[0033] Figure 10 For the present invention Figure 9 Enlarged view of section D;

[0034] Figure 11 This is a schematic diagram of the structure of the bearing plate and threaded hole in this invention;

[0035] Figure 12 For the present invention Figure 11 Enlarged view of section E in the middle;

[0036] Figure 13 This is a schematic diagram of the structure of the crane body and support frame in this invention;

[0037] Figure 14 For the present invention Figure 13 Enlarged view of section F in the middle.

[0038] In the diagram: 1. Support frame; 2. Crane body; 3. Linkage assembly; 31. Drive rod; 32. Limiting hole; 33. Limiting telescopic rod; 4. Fixing assembly; 5. Support unit; 51. Support block; 52. Insertion block; 6. Locking unit; 61. Threaded rod; 62. Rotating sprocket; 63. Pressing sprocket; 64. Chain; 7. Sliding unit; 71. Sliding block; 72. Sliding rod; 73. Support plate; 8. Bearing assembly; 81. Bearing plate; 82. Bearing block; 83. Threaded hole; 9. Moving assembly; 91. Support wheel; 92. Support rod; 93. Drive gear; 94. Drive rack; 95. Drive shaft; 96. Moving block; 10. Support rod; 11. Fixing plate; 12. Support cross plate; 13. Moving track; 14. Linear hydraulic rod; 15. Back plate. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example: Reference Figures 1-14 The above describes a combined cantilever and splice crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect. It includes a support frame 1 and a crane body 2 set on the support frame 1. A support rod 10 is set on the support frame 1. The support rod 10 can move on the support frame 1. A fixing component 4 is set on the support rod 10. The fixing component 4 can fix the support rod 10 to the support frame 1. When the support rod 10 moves, the fixing component 4 releases the fixing of the support rod 10.

[0041] The support frame 1 is provided with a load-bearing component 8, and the fixing component 4 includes a support unit 5 and a locking unit 6. Both the support unit 5 and the locking unit 6 can be moved onto the load-bearing component 8 to form a locking structure between the locking unit 6 and the load-bearing component 8, so that the load-bearing component 8 provides support to the support rod 10 through the support unit 5. The crane body 2 is movably mounted on the support frame 1, which is the prior art.

[0042] After the concrete sections at both ends of the bridge are completed, when the steel structure box girder needs to be constructed, a support frame 1 is erected on the constructed bridge section. The two ends of the support frame 1 are fixed to the concrete sections at both ends of the bridge. The main body 2 of the crane on the support frame 1 lifts the steel structure box girder to the end of the constructed bridge and fixes the steel structure box girder to the constructed bridge section by welding. After welding is completed, the support rod 10 moves above this bridge section, and the support unit 5 and locking unit 6 move to the bearing component 8. The support rod 10 connects to the welded bridge section and is used to support the bridge section. The support unit 5 transmits the force borne by the support rod 10 to the support frame 1, and the locking unit 6 locks it to the bearing component 8. The crane main body 2 moves away to lift the next steel structure box girder. The support rod 10 supports the nearest completed bridge section.

[0043] After the steel structure box girder is constructed, the nearest steel structure box girder is supported by the support rod 10. One end of the completed bridge segment is supported by the pier, and the other end is supported by the support rod 10. This reduces the linear deformation and stress damage caused by excessive stress on the completed bridge segment under its own weight, and improves the stability of the bridge segment during construction. The movable support rod 10 facilitates the construction of the next bridge segment. After the support rod 10 is moved to the designated position, the support unit 5 and the locking unit 6 move onto the load-bearing component 8. The support unit 5 transfers the force of the support rod 10 to the support frame 1, which improves the load-bearing capacity of the support rod 10. The locking unit 6 locks the support rod 10 onto the support frame 1, ensuring the stability of the support rod 10 after being stressed. The support rod 10 is not likely to shift or fall off the support frame 1 after being stressed, ensuring the safety and reliability of the structure.

[0044] Furthermore, the support rod 10 is a hydraulic telescopic rod in the prior art, which can be adjusted to a certain length to adapt to the height of different bridge sections. In practical applications, it is necessary to use steel cables to fix it to the anchor points on both sides of the end of the steel structure box girder to ensure the stability of the hoisting.

[0045] As another preferred embodiment, the support frame 1 is equipped with multiple support rods 10 and fixing components 4, which can hoist multiple steel structure box girders to ensure the stability of the long-span bridge during construction.

[0046] The main body 2 of the crane is a winch as in the prior art.

[0047] During the cantilever construction of the bridge concrete section, a hanging basket is fixedly installed on the main body 2 of the crane. After setting up the skeleton such as steel bars and stress tendons in the hanging basket, concrete is poured into the hanging basket to complete the construction of the concrete section. After the construction of the concrete section is completed, the anchoring points on the main body 2 of the crane are anchored to the steel structure box girder. The main body 2 of the crane lifts the steel structure box girder into the designated position and welds the steel structure box girder to the constructed bridge section to carry out the construction of the steel structure bridge section.

[0048] Multiple support rods 10 and fixing components 4 are provided. Due to the large span of the support frame 1, the support rods 10 have the function of suspending unconnected steel beam segments, and also have the ability to support connected steel beam segments. Thus, as the number of suspended steel beam segments increases and the cantilever lengthens, although the bending moment theoretically increases when the hoisted steel beam reaches the mid-span of the support frame 1, the support provided also increases, which to a certain extent reduces the bending moment of the support frame 1 when hoisting steel beam segments at the mid-span.

[0049] When the support frame 1 is used in the construction of cable-stayed bridges, it is supported by existing cable-stayed steel cable columns through steel cables to ensure the stability of the support frame 1 during large spans. When used in other large-span bridges, steel structure support towers are assembled on the shore or in bridge sections that have already been constructed. The steel structure support towers support the support frame 1 through steel cables.

[0050] Furthermore, referring to Figures 1-14 The supporting component 8 includes a supporting plate 81 and several supporting blocks 82. The supporting unit 5 includes two supporting blocks 51 and several insert blocks 52. The supporting blocks 51 and the insert blocks 52 can move towards the supporting plate 81, so that the several insert blocks 52 are respectively inserted between two adjacent supporting blocks 82. The two supporting blocks 51 are respectively located at the top and bottom of the corresponding supporting blocks 82 and abut against the corresponding supporting blocks 82.

[0051] After the support unit 5 moves to the bearing assembly 8, the insertion block 52 is inserted between the two corresponding bearing blocks 82. The support block 51 is located above the bearing block 82 and abuts against the bearing block 82. The force of the support rod 10 is transmitted to the support block 51, and the support block 51 transmits the force to the bearing block 82. The bearing block 82 transmits the force to the support frame 1 through the bearing plate 81.

[0052] Furthermore, referring to Figures 1-14 The supporting component 8 also includes a number of threaded holes 83, which are equidistantly provided on the supporting plate 81. The locking unit 6 includes a number of threaded rods 61, which can move toward the supporting plate 81 and can rotate, and screw into the corresponding threaded hole 83 while moving.

[0053] The locking unit 6 moves toward the bearing component 8, and the threaded rod 61 moves to abut against the threaded hole 83. The threaded rod 61 is screwed into the threaded hole 83, making it difficult for the fixing component 4 to move and the support rod 10 to move after being subjected to force, thus ensuring stability. The threaded rod 61 can also transfer the force on the support rod 10 to the bearing plate 81, thereby improving the bearing capacity of the support rod 10.

[0054] Furthermore, referring to Figures 1-14 The locking unit 6 also includes several rotating sprockets 62, a pressing sprocket 63, and a chain 64. A connecting plate is fixedly installed on each of the two support blocks 51. Several threaded rods 61 are rotatably connected to the corresponding connecting plates. Several rotating sprockets 62 are fixedly installed on the corresponding threaded rods 61. The pressing sprocket 63 is rotatably installed on the connecting plate. The inner ring of the chain 64 meshes with several rotating sprockets 62, and the outer ring of the chain 64 meshes with the chain 64.

[0055] By driving the clamping sprocket 63 to rotate, the clamping sprocket 63 drives the chain 64 to move, the chain 64 drives all the clamping sprockets 63 to rotate, and the clamping sprocket 63 drives the corresponding threaded rod 61 to rotate. This causes the threaded rod 61 to rotate as it moves into the threaded hole 83, allowing it to be screwed into the threaded hole 83 and a certain tightening force to be applied. This enables multiple threaded rods 61 to move synchronously, ensuring the synchronicity of the rotation of multiple threaded rods 61 and preventing inconsistent depths of screwing into the threaded hole 83 that could cause jamming.

[0056] Furthermore, referring to Figures 1-14 The fixing component 4 also includes two sliding units 7. Both support blocks 51 are connected to the fixing plate 11 via corresponding sliding units 7. Support rods 10 are fixedly installed on the two fixing plates 11. The fixing component 4 and the fixing plates 11 move on the support frame 1 via the moving component 9. A support cross plate 12 is fixedly installed on the support frame 1, and two moving rails 13 are fixedly installed on the support cross plate 12. A through hole is provided between the two moving rails 13 on the support cross plate 12. The moving component 9 includes two supports... The system includes a wheel 91, a support rod 92, a drive gear 93, a drive rack 94, a drive shaft 95, and a moving block 96. The drive rack 94 is fixedly mounted on the support cross plate 12. The moving block 96 passes through a through hole. The drive shaft 95 is rotatably connected to the moving block 96. The drive gear 93 is fixedly sleeved on the drive shaft 95 and meshes with the drive rack 94. The support rod 92 is rotatably connected to the moving block 96. Both support wheels 91 are fixedly sleeved on the support rod 92. The support wheels 91 abut against the corresponding moving track 13.

[0057] One end of the drive shaft 95 is connected to the first drive motor. When the support rod 10 needs to move, the first drive motor drives the drive gear 93 to rotate. When the drive gear 93 rotates on the drive rack 94, it moves itself. The drive gear 93 drives the moving block 96 to move through the drive shaft 95. The moving block 96 drives the fixed plate 11 and the fixed assembly 4 to move. The moving block 96 drives the support wheel 91 to rotate through the support rod 92. The support wheel 91 rotates on the moving track 13. The fixed plate 11 and the fixed assembly 4 are supported by the support wheel 91. Since the support rod 10 does not lift the steel structure box girder during the movement, the load-bearing capacity requirements for the support wheel 91 and the support rod 92 are relatively low.

[0058] Furthermore, referring to Figures 1-14The sliding unit 7 includes a sliding block 71, a sliding rod 72, and a support plate 73. The support plate 73 is fixedly installed on the fixed plate 11, and a stabilizing plate is fixedly installed on the other end of the support plate 73. One end of the sliding rod 72 is fixedly installed on the fixed plate 11, and the other end of the sliding rod 72 is fixedly installed on the stabilizing plate. One end of the moving block 96 is fixedly installed on the support plate 73, and the sliding block 71 is fixedly installed on the support block 51. A sliding hole is opened on the sliding block 71 corresponding to the position of the sliding rod 72. The sliding rod 72 passes through the sliding hole and slides in cooperation with the sliding hole.

[0059] When the support unit 5 and the locking unit 6 move toward the bearing component 8, the support block 51 drives the sliding block 71 to move. The sliding block 71 moves on the sliding rod 72, ensuring stability during the movement.

[0060] Furthermore, referring to Figures 1-14 Both the fixing component 4 and the bearing component 8 are provided in two sets. The two sets of bearing components 8 are respectively set on the corresponding support frame 1. A linear hydraulic rod 14 is provided between the two fixing components 4. The linear hydraulic rod 14 can push the support unit 5 and the locking unit 6 to move in the direction of the corresponding bearing component 8.

[0061] When it is necessary to move the support unit 5 and the locking unit 6 toward the bearing component 8, the output end of the linear hydraulic rod 14 extends outward, and the linear hydraulic rod 14 pushes the support unit 5 and the locking unit 6 in the two fixed components 4 to move.

[0062] Furthermore, referring to Figures 1-14 A back plate 15 is fixedly installed between the two support blocks 51, and an insertion block 52 is fixedly installed on one side of the back plate 15. The two ends of the linear hydraulic rod 14 are respectively fixedly installed on the corresponding back plates 15.

[0063] When it is necessary to move the support unit 5 and the locking unit 6 toward the bearing assembly 8, the linear hydraulic rod 14 pushes the two back plates 15 to move. The two back plates 15 drive the corresponding support blocks 51 to move. The support blocks 51 drive the insertion block 52, the sliding block 71 and the connecting plate to move, so that the insertion block 52 moves between the corresponding two bearing blocks 82. The connecting plate drives the threaded rod 61 to move, so that the threaded rod 61 is screwed into the threaded hole 83 while rotating.

[0064] When the resistance required for the linear hydraulic rod 14 to push the two back plates 15 is inconsistent, the linear hydraulic rod 14 first pushes the back plate 15 with the lower resistance to move. After the back plate 15 with the lower resistance moves into place, the output end of the linear hydraulic rod 14 continues to extend and pushes the other back plate 15 into place.

[0065] Furthermore, referring to Figures 1-14A linkage component 3 is provided between the two fixed components 4. When the threaded rod 61 in one of the fixed components 4 rotates, it can drive the threaded rod 61 in the other fixed component 4 to rotate through the linkage component 3. The linkage component 3 includes two drive rods 31, a limiting hole 32, and a limiting telescopic rod 33. The two drive rods 31 are respectively fixedly installed on the corresponding rotating sprockets 62. The limiting hole 32 is opened at the end of the drive rod 31 away from the rotating sprocket 62. The cross-section of the limiting hole 32 is rectangular. The cross-section of the limiting telescopic rod 33 is rectangular, and both ends of the limiting telescopic rod 33 are inserted into the corresponding limiting hole 32 and slide in cooperation with the limiting hole 32.

[0066] One of the clamping sprockets 63 is connected to a second drive motor. The second drive motor drives one of the clamping sprockets 63 to rotate. The clamping sprocket 63 drives other rotating sprockets 62 to rotate via a chain 64, thereby driving the threaded rod 61 to rotate. When the rotating sprocket 62 rotates, it drives the corresponding drive rod 31 to rotate. The drive rod 31 drives the limiting telescopic rod 33 to rotate. The limiting telescopic rod 33 drives another drive rod 31 to rotate. The other drive rod 31 drives the rotating sprocket 62 and the threaded rod 61 in another fixed component 4 to rotate, thereby driving the threaded rod 61 in the two fixed components 4 to rotate. When the support block 51 drives the rotating sprocket 62 to move, the rotating sprocket 62 drives the drive rod 31 to move. The drive rod 31 moves on the limiting telescopic rod 33. Since the cross-section of the limiting hole 32 and the limiting telescopic rod 33 are both rectangular, the drive rod 31 can still drive the limiting telescopic rod 33 to move during the process of moving on the limiting telescopic rod 33.

[0067] Furthermore, referring to Figures 1-14 The support block 82 has two support ramps at one end near the insertion block 52. The two support ramps gradually slope from both sides of the support block 82 toward the center until they are connected to each other. The insertion block 52 has two insertion ramps at one end near the support block 82. The two insertion ramps gradually slope from both sides of the insertion block 52 toward the center until they are connected to each other.

[0068] To ensure that the insertion block 52 can smoothly enter between the two support blocks 82 and prevent it from being stuck, the first drive motor has no self-locking setting. When the insertion block 52 enters between the two support blocks 82 under the action of the inclined surface of the support block 82, the insertion block 52 has a small range of position. The insertion block 52 drives the support block 51, the moving block 96 and the drive gear 93 to move. The drive gear 93 can move on the drive rack 94 to prevent the self-locking motor from limiting the drive gear 93 and preventing the drive gear 93 from rotating, which would cause the insertion block 52 to be unable to move into the space between the two support blocks 82 and get stuck.

[0069] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined cantilever and splice crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect, comprising a support frame (1) and a crane body (2) mounted on the support frame (1), characterized in that: The support frame (1) is provided with a support rod (10), which can move on the support frame (1). The support rod (10) is provided with a fixing component (4), which can fix the support rod (10) on the support frame (1). When the support rod (10) moves, the fixing component (4) releases the fixing of the support rod (10). The fixing component (4) also includes two sliding units (7). The two support blocks (51) are connected to the fixing plate (11) through the corresponding sliding unit (7). The support rod (10) is fixedly installed on the two fixing plates (11). The fixing component (4) and the fixing plate (11) move on the support frame (1) through the moving component (9). The support frame (1) is provided with a bearing component (8), and the fixing component (4) includes a support unit (5) and a locking unit (6). Both the support unit (5) and the locking unit (6) can be moved onto the bearing component (8) to form a locking structure between the locking unit (6) and the bearing component (8), so that the bearing component (8) provides support to the support rod (10) through the support unit (5). The bearing assembly (8) includes a bearing plate (81) and a plurality of bearing blocks (82). The support unit (5) includes two support blocks (51) and a plurality of insertion blocks (52). The support blocks (51) and the insertion blocks (52) can move toward the bearing plate (81) so that the plurality of insertion blocks (52) are respectively inserted between two adjacent bearing blocks (82). The two support blocks (51) are respectively located at the top and bottom of the corresponding bearing blocks (82) and abut against the corresponding bearing blocks (82). A support plate (12) is fixedly installed on the support frame (1). Two moving rails (13) are fixedly installed on the support plate (12). A through hole is opened between the two moving rails (13) on the support plate (12). The moving component (9) includes two support wheels (91), a support rod (92), a drive gear (93), a drive rack (94), a drive shaft (95), and a moving block (96). The drive rack (94) is fixedly installed on the support plate (12). The moving block (96) is set through the through hole. The drive shaft (95) is rotatably connected to the moving block (96). The drive gear (93) is fixedly sleeved on the drive shaft (95) and meshes with the drive rack (94). The support rod (92) is rotatably connected to the moving block (96). Both support wheels (91) are fixedly sleeved on the support rod (92). The support wheels (91) abut against the corresponding moving rails (13).

2. The combined cantilever and splicing crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect as described in claim 1, characterized in that: The bearing assembly (8) also includes a plurality of threaded holes (83), which are equidistantly provided on the bearing plate (81). The locking unit (6) includes a plurality of threaded rods (61), which can move toward the bearing plate (81) and can rotate, and screw into the corresponding threaded hole (83) while moving.

3. The combined cantilever and splicing crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect according to claim 2, characterized in that: The locking unit (6) also includes several rotating sprockets (62), a clamping sprocket (63) and a chain (64). A connecting plate is fixedly installed on each of the two support blocks (51). Several threaded rods (61) are rotatably connected to the corresponding connecting plates. Several rotating sprockets (62) are fixedly installed on the corresponding threaded rods (61). The clamping sprocket (63) is rotatably installed on the connecting plate. The inner ring of the chain (64) meshes with several rotating sprockets (62), and the outer ring of the chain (64) meshes with the chain (64).

4. The combined cantilever and splicing crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect as described in claim 1, characterized in that: The sliding unit (7) includes a sliding block (71), a sliding rod (72), and a support plate (73). The support plate (73) is fixedly installed on the fixed plate (11). A stabilizing plate is fixedly installed on the other end of the support plate (73). One end of the sliding rod (72) is fixedly installed on the fixed plate (11), and the other end of the sliding rod (72) is fixedly installed on the stabilizing plate. One end of the moving block (96) is fixedly installed on the support plate (73). The sliding block (71) is fixedly installed on the support block (51). A sliding hole is provided on the sliding block (71) corresponding to the position of the sliding rod (72). The sliding rod (72) passes through the sliding hole and slides in cooperation with the sliding hole.

5. The combined cantilever and splicing crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect according to claim 1, characterized in that: Both the fixing component (4) and the bearing component (8) are provided in two sets. The two sets of bearing components (8) are respectively set on the corresponding support frame (1). A linear hydraulic rod (14) is provided between the two fixing components (4). The linear hydraulic rod (14) can push the support unit (5) and the locking unit (6) to move in the direction of the corresponding bearing component (8).

6. The combined cantilever and splicing crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect according to claim 5, characterized in that: A back plate (15) is fixedly installed between the two support blocks (51), the insertion block (52) is fixedly installed on one side of the back plate (15), and the two ends of the linear hydraulic rod (14) are respectively fixedly installed on the corresponding back plate (15).

7. The combined cantilever and splicing crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect according to claim 2, characterized in that: A linkage component (3) is provided between the two fixed components (4). When the threaded rod (61) in one of the fixed components (4) rotates, the threaded rod (61) in the other fixed component (4) can be driven to rotate through the linkage component (3). The linkage component (3) includes two drive rods (31), a limiting hole (32), and a limiting telescopic rod (33). The two drive rods (31) are respectively fixedly installed on the corresponding rotating sprockets (62). The limiting hole (32) is opened at the end of the drive rod (31) away from the rotating sprocket (62). The cross-section of the limiting hole (32) is rectangular. The cross-section of the limiting telescopic rod (33) is rectangular. Both ends of the limiting telescopic rod (33) are inserted into the corresponding limiting hole (32) and slide in cooperation with the limiting hole (32).

8. The combined cantilever and splicing crane for a steel-concrete composite variable cross-section continuous box girder bridge with good support effect according to claim 1, characterized in that: The support block (82) has two support slopes at one end near the insertion block (52). The two support slopes gradually slope from both sides of the support block (82) toward the center until they are connected to each other. The insertion block (52) has two insertion slopes at one end near the support block (82). The two insertion slopes gradually slope from both sides of the insertion block (52) toward the center until they are connected to each other.

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