A bridge crane and construction method for closure of mid-span steel box beams

Abstract

The present invention discloses a bridge crane and a construction method for the mid-span closure of a steel box girder, and relates to the technical field of bridge construction. The bridge crane for the mid-span closure of a steel box girder comprises a support module, a lifting module and an adjustment module; the adjustment module comprises a first crossbeam and a second crossbeam; the second crossbeam is detachably connected to the closure beam segment. A side support beam is provided in the suspension gap; the outer rotation end of the side support beam can be rotated out and pressed onto the fixed beam segment to support the closure beam segment, and the inner rotation end can be rotated out and pulled into contact with the lower surface of the first crossbeam. The friction between the side support beam and the fixed beam segment is utilized to improve the stability of the closure beam segment, thereby avoiding the problem of difficulty in installing the first stacking plate due to the shaking of the closure beam segment; at the same time, it is ensured that the top surface of the closure beam segment and the top surface of the fixed beam segment can be aligned, so as to facilitate permanent fixed connection in the later stage. The diagonal support arm, the abutting hydraulic cylinder, the second crossbeam and the side support beam form a stable triangular support structure to avoid the side support beam from being compressed and bent.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a bridge deck crane and a construction method for closure of a mid-span of a steel box girder. Background Art

[0002] Cable-stayed bridges are a common type of bridge, often used for crossing seas and rivers. During construction, standard beam segments are typically installed starting at each end and progressing toward the center. Finally, gaps are filled with closure beam segments of appropriate length, depending on the size of the remaining gap. Once a standard beam segment is fixed and installed, it becomes a fixed beam segment.

[0003] During construction, the joint beam segment is suspended in the gap by hoisting, and then the joint beam segment and the fixed beam segment are temporarily connected using a yard plate; however, the joint beam segment in the suspended state often shakes (for example, due to wind force or vibration), that is, the joint beam segment and the fixed beam segment are displaced and cannot be temporarily fixed, making the welding and installation of the first yard plate very difficult. Summary of the Invention

[0004] In order to overcome the problem in the above background technology that "the welding and installation of the first deck plate is very difficult during the closure process", the present invention provides a bridge crane and a construction method for closure of the mid-span of a steel box girder.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] The lifting mechanism is a kind of key which is set up in the state that the support frame is the key to the key of the lifting bridge, and the key is set up in the state that the support frame is the key to key.

[0007] As a further optimization solution of the present invention, an abutting hydraulic cylinder is provided in the inner cavity of the end of the diagonal support arm close to the second crossbeam, and the output shaft of the abutting hydraulic cylinder can extend from the inner cavity of the diagonal support arm to engage with the abutting inclined hole on the side wall of the second crossbeam.

[0008] As a further optimization solution of the present invention, a downward extension protrusion is provided at the end of the diagonal support arm away from the second cross beam; the downward extension protrusion is used to press the fixed beam segment to compensate for the gap between the side support cross beam and the fixed beam segment.

[0009] As a further optimization scheme of the present invention, the side support beam is provided with a top opening and a accommodating cavity for accommodating the diagonal support arm, and a lifting hydraulic cylinder is installed in the accommodating cavity. The bottom end of the lifting hydraulic cylinder is hinged to the side support beam, and the top end is hinged to the middle part of the diagonal support arm.

[0010] As a further optimization solution of the present invention, a downward-extending vertical plate is provided on the bottom surface of the first crossbeam, and a pulling assembly is provided in the lower middle part of the downward-extending vertical plate. The pulling assembly can pull the inner rotating end upward to prevent the joint beam segment from sinking.

[0011] As a further optimization solution of the present invention, the pulling assembly includes two L-shaped pulling claws, and a transverse slot is provided between the pulling claws and the lower extension plate. The openings of the two transverse slots respectively point to both sides of the lower extension plate to adapt to and engage the inner rotating end from both sides.

[0012] As a further optimization scheme of the present invention, a limiting oil cylinder is provided in the inner cavity of one of the inner rotating ends, and the output shaft of the limiting oil cylinder can extend from the end face of the inner rotating end and be inserted into the limiting hole of the end face of the other inner rotating end, so that the two side support beams remain coaxial and avoid falling out of the transverse slot.

[0013] As a further optimization scheme of the present invention, the bottom surface of the inner rotating end is provided with a bottom arc surface, and the pulling claw includes a vertical plate and a bottom plate connected in an L shape, and the upper surface of the bottom plate is provided with a fitting arc surface adapted to the bottom arc surface and a horizontal clamping plane tangent to the fitting arc surface.

[0014] As a further optimization solution of the present invention, an extension arc surface is provided at one end of the fitting arc surface away from the transverse clamping plane, and an extension plane is provided at one end of the transverse clamping plane away from the fitting arc surface, which is used to adapt to the inward rotating end that is clamped in an inclined shape.

[0015] A construction method for closure of a steel box girder mid-span, that is, using a bridge crane for closure of a steel box girder mid-span to perform closure construction on a bridge, comprising the following steps: S1, connecting the lower extension plate to the lug plate; S2, hoisting, transversely shifting, and rotating the closure beam segment under the condition that both the outer rotation end and the inner rotation end are placed in the suspension gap, until the closure beam segment is located above the gap between the fixed beam segments and fits into the gap; S3, rotating the side support beam to align with the second cross beam. The beam is vertical, and the inner rotating end is stuck in the pulling assembly; S4, the output shaft of the limiting oil cylinder extends out and is inserted into the limiting hole; S5, the joint beam segment is lowered and inserted into the notch until the triangular support structure is pressed against the fixed beam segment; S6, the joint beam segment and the fixed beam segment are temporarily connected with a code plate; S7, the joint beam segment and the fixed beam segment are permanently fixed and connected, and then the code plate is removed; S8, the lower extension plate and the ear plate are disassembled.

[0016] In summary, the present invention has at least one of the following advantages:

[0017] (1) The present invention has a simple structure and reliable functions. The side support beam can be rotated out laterally and pressed onto the fixed beam segment. The friction between the side support beam and the fixed beam segment is used to improve the stability of the joint beam segment, avoiding the problem of difficulty in installing the first stacking plate due to the shaking of the joint beam segment. At the same time, it ensures that the top surface of the joint beam segment and the top surface of the fixed beam segment can be aligned to facilitate permanent fixed connection in the later stage.

[0018] (2) The friction between the side support beam and the fixed beam segment can limit the joint beam segment, which requires fewer stacking plates, thereby reducing the time for stacking plate welding and disassembly, simplifying the work steps, and improving construction efficiency.

[0019] (3) The diagonal support arm, the abutting hydraulic cylinder, the second crossbeam and the side support crossbeam form a stable triangular support structure, thereby improving the bearing capacity of the side support crossbeam, preventing the side support crossbeam from being compressed and bending, and further preventing the joint beam segment from sinking.

[0020] (4) The side support beam can be rotated to be parallel to the second beam, so that it can be completely stored in the suspension gap. The total length of the two side support beams in the collinear state is greater than the width of the fixed beam segment. The edge of the fixed beam segment is installed with inclined cables and support modules. Therefore, after the joint beam segment is rotated 90 degrees, the side support beam can be rotated out to avoid the problem of collision / stuck between the side support beam and the inclined cables / support modules.

[0021] (5) The tensioning assembly applies an upward pulling force to the inner rotating end of the side support beam, thereby avoiding the problem of the inner rotating end and the joint beam segment sinking; at the same time, under the pulling of the tensioning assembly, the two side support beams have higher straightness, and the first beam, the second beam, the side support beam and the tensioning assembly form a dish-shaped load-bearing structure, which can greatly reduce the bending moment borne by the first rotating shaft, thereby improving the functional reliability, load-bearing capacity and service life of the present invention.

[0022] (6) The connecting assembly includes two L-shaped connecting claws, which are arranged symmetrically with respect to the center of the bottom surface of the lower extension plate. The two side support beams are coaxially arranged by a limiting oil cylinder, and the left and right sides of the inner rotating end are provided with connecting claws for stopping, thereby limiting the position of the side support beams and preventing the side support beams from falling out of the connecting assembly, thereby improving the structural stability of the present invention and ensuring construction safety.

[0023] (7) The bottom surface of the inner rotating end is provided with a bottom arc surface, and the rotation center of the first crossbeam and the second crossbeam at the rotation connection position is adapted to the bottom arc surface. The upper surface of the bottom plate is provided with a fitting arc surface adapted to the bottom arc surface and a horizontal clamping plane tangent to the fitting arc surface. The present invention can greatly improve the compatibility with the tilt angle of the inner rotating end, that is, whether the inner rotating end is vertical or tilted, it can be adapted and pressed with the upper surface of the bottom plate (fitting arc surface or horizontal clamping plane), thereby improving the structural stability, avoiding the gap caused by the inability of the inner rotating end and the pulling claw to fit together, and further avoiding unnecessary vibration and looseness caused by the gap.

[0024] (8) Since the side support beam does not rotate around itself, it has lateral movement while tilting, so the inward rotating end will be stuck at different positions on the top surface of the base plate; therefore, an extension arc surface is provided at the end of the fitting arc surface away from the horizontal clamping plane, and an extension plane is provided at the end of the horizontal clamping plane away from the fitting arc surface. The extension arc surface and the extension plane are both used to adapt to and support the inward rotating end that is stuck in an inclined state. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application is further described below with reference to the accompanying drawings:

[0026] Figure 1 It is a front view schematic diagram of the overall structure of the present invention;

[0027] Figure 2 Schematic diagram of the state of hoisting the closure beam segment for the adjustment module;

[0028] Figure 3 It is a schematic diagram of the structure of the adjustment module;

[0029] Figure 4 It is a front view schematic diagram of the adjustment module structure;

[0030] Figure 5 It is a side view schematic diagram of the adjustment module structure;

[0031] Figure 6 This is a schematic diagram of the installation position of the side support beam;

[0032] Figure 7 This is a schematic diagram of the side support beam being rotated out;

[0033] Figure 8 It is a schematic diagram of the front elevation view of the external rotating end structure;

[0034] Figure 9 This is a schematic diagram of the location and structure of the downward bulge;

[0035] Figure 10 Schematic diagram of the sinking state of the inner rotation end and the closure beam segment;

[0036] Figure 11 This is a schematic diagram of the structure of the pull-connection assembly when viewed from above;

[0037] Figure 12 This is a schematic diagram of the bottom curved surface structure when viewed from above;

[0038] Figure 13 It is a right side view schematic diagram of the engagement state of the bottom arc surface and the pulling claw;

[0039] Figure 14 It is a right side schematic diagram of the bottom arc surface being inclined and engaged with the pulling claw;

[0040] Figure 15 It is a schematic side elevation view of the extended curved surface and extended plane structure;

[0041] Figure 16 This is a schematic diagram of the output shaft of the limit cylinder inserted into the limit hole;

[0042] Figure 17 It is a schematic diagram of the bottom arc surface position when viewed from an oblique upward angle.

[0043] Description of reference numerals:

[0044] In the figure,

[0045] 1. Support module;

[0046] 2. Lifting module;

[0047] 3. Adjustment module; 31. First crossbeam; 310. First linear actuator; 311. Lower extension plate; 312. Pulling assembly; 3121. Pulling claw; 31211. Fitting arc surface; 31212. Horizontal clamping plane; 31213. Extended arc surface; 31214. Extended plane; 31215. Relief groove; 32. Second crossbeam; 320. Second linear actuator; 3201. Suspension gap; 321. Lower extension plate; 322. Abutment oblique hole; 33. Rotation assembly; 34. Side support crossbeam; 341. First rotating shaft; 342. Accommodating cavity; 343. Oblique support arm; 3431. Lower extension protrusion; 34311. Anti-slip layer; 344. Abutment hydraulic cylinder; 345. Lifting hydraulic cylinder; 346. Bottom arc surface; 347. Limiting oil cylinder; 348. Limiting hole;

[0048] 4. Closing beam segment; 41. Lifting lug plate; 42. Dock plate;

[0049] 5. Fixed beam segment; 51. Stay cable. DETAILED DESCRIPTION

[0050] Based on the above structural features of the present application, the implementation methods of the present application are further described:

[0051] Reference Figures 1 to 3 This embodiment provides a bridge crane for closure of a steel box girder mid-span. The crane comprises a support module 1 crimped and fixed to a fixed beam segment 5, a lifting module 2 connected to the support module 1, and an adjustment module 3 connected to the lifting module 2. The fixed beam segment 5 is a completed standard beam segment in a fixed state (achieved by the connecting forces between the inclined cables 51, the load-bearing columns, and adjacent fixed beam segments 5). The fixed beam segment 5 is divided into two sections with a gap between them. The closure beam segment 4 is fixedly installed in the gap to facilitate closure.

[0052] Reference Figures 1 to 3 The support module 1 is a steel frame structure, with both ends respectively erected and fixed on two fixed beam segments 5. During construction, after the last standard beam segment is installed, the bridge crane remains in place, the top cross brace at the front end of the crane is removed, and a connecting beam is used to connect the top support frames of the two bridge cranes together (for example, by bolting them together) to form a steel frame structure, thereby supporting the lifting module 2, the adjustment module 3 and the joint beam segment 4. At the same time, there is no need to set up additional counterweights for balancing the joint beam segment 4, which can simplify construction steps, reduce material requirements, and improve construction efficiency. The steel frame structure and support frame are both conventional existing technologies in the industry, and the specific structure will not be repeated here.

[0053] Reference Figures 2 and 3The adjustment module 3 includes a first crossbeam 31 and two second crossbeams 32 arranged in an I-shape. The two second crossbeams 32 are respectively arranged at the two ends of the first crossbeam 31. The middle portion of the second crossbeam 32 is arranged below the end of the first crossbeam 31 and is rotatably connected (for example, by a hinge) to achieve longitudinal swing of the second crossbeam 32. The lower surface of the second crossbeam 32 is provided with a lower extension plate 321 (for example, welded or fixedly connected by bolts). The lower extension plate 321 is detachably connected to the lug plate 41 on the top surface of the joint beam segment 4 (for example, detachably connected by bolts). The lug plate 41 is upright and mounted on the top surface of the joint beam segment 4 (for example, detachably connected by bolts or fixedly connected by welding, and can then be removed by removing the bolts or cutting the root of the lug plate 41).

[0054] Reference Figures 1 to 3 The adjustment module 3 also includes a rotating assembly 33. The rotating assembly 33 includes a hoisting shell and a vertical first motor. The motor shell of the first motor is fixedly installed in the hoisting shell (for example, fixedly connected by bolts). The output shaft of the first motor is rotatably connected to the middle part of the first beam 31 (for example, hinged), thereby realizing the longitudinal swing of the first beam 31. Since the second beam 32 can also swing longitudinally, the longitudinal and transverse slopes of the joint beam segment 4 can be adjusted by swinging, so that the joint beam segment 4 is aligned with the fixed beam segment 5. The lifting module 2 includes a crane, and the crane includes a transverse pulley, a winch, a sling and a pulley group. The transverse pulley is installed on the connecting beam and / or the support frame and can move laterally. The winch is connected to the transverse pulley, and the winch is connected to the hoisting shell through a sling and a pulley group, thereby realizing the control of the lifting and lowering of the adjustment module 3 and preventing the rotation of the hoisting shell. These are all conventional existing technologies in the industry and will not be described in detail.

[0055] Reference Figure 3 and Figure 4 A first linear actuator 310 is disposed between the rotation assembly 33 and the first crossbeam 31. The first linear actuator 310 is tilted, with one end pivotally connected to the outer wall of the hoisting housing (e.g., via a hinge) and the other end pivotally connected to the top end of the first crossbeam 31 (e.g., via a hinge). The first linear actuator 310 is capable of driving the first crossbeam 31 to swing longitudinally. Two first linear actuators 310 are provided, connected to the left and right ends of the first crossbeam 31, respectively. By extending one linear actuator 310 and contracting the other, the first crossbeam 31 can be swung quickly and stably, thereby driving the joint beam segment 4 to swing and align with the fixed beam segment 5.

[0056] Reference Figure 3 and Figure 5A second linear actuator 320 is disposed between the first and second beams 31, 32. The second linear actuator 320 is tilted, with one end pivotally connected to the sidewall of the first beam 31 (e.g., via a hinge) and the other end pivotally connected to the top surface of the second beam 32 (e.g., via a hinge). This allows the second linear actuator 320 to drive the second beam 32 in longitudinal swing. The distance from the connection point between the second beam 32 and the second linear actuator 320 and the end (the nearest end) of the second beam 32 is 3 / 4 to 7 / 8 of the total length of the second beam 32, ensuring excellent force transmission. Four second linear actuators 320 are provided, arranged in pairs on either side of the first beam 31. Each second beam 32 is connected to two second linear actuators 320, and the two second linear actuators 320 connected to the same second beam 32 are located at the same end, on either side, of the first beam 31.

[0057] Reference Figure 3 、 Figure 6 and Figure 10 A suspension gap 3201 is provided between the second crossbeam 32 and the joint beam segment 4. The suspension gap 3201 is in the form of a strip. A side support beam 34 is provided in the suspension gap 3201, the middle of which is rotatably connected to the second crossbeam 32. The side support beam 34 is in the form of a straight rod. A first rotating shaft 341 is inserted into the middle of the side support beam 34. The bottom end of the first rotating shaft 341 is fixedly connected to the side support beam 34 (for example, by bolts), and the top end is inserted into the inner cavity of the second crossbeam 32. A second motor is installed in the inner cavity of the second crossbeam 32. The output shaft of the second motor is directly or indirectly connected (for example, through a gear set) to the top of the first rotating shaft 341. The second motor can drive the first rotating shaft 341 and the side support beam 34 to rotate synchronously. The two ends of the side support beam 34 are respectively an outward-swinging end and an inward-swinging end. The outward-swinging end of the side support beam 34 can be rotated out of the suspension gap 3201 and pressed against the fixed beam segment 5 to support the joint beam segment 4. The inward-swinging end can be rotated out of the suspension gap 3201 and connected to the lower surface of the first crossbeam 31 by tension. The inward-swinging end can be rotated out of the suspension gap 3201 and located below the middle of the first crossbeam 31, thereby achieving convenient tension connection.

[0058] The middle portion of the first rotating shaft 341 is connected to the socket on the bottom surface of the second crossbeam 32 via a water-stop bearing, thereby improving the sealing performance and ensuring that the second motor operates in a dry environment.

[0059] Reference Figure 1 、 Figure 6 and Figure 7, the side support beam 34 can be rotated to be parallel to the second beam 32, so as to be accommodated in the suspension gap 3201. At this time, both the inner and outer rotating ends are located in the suspension gap 3201; this can avoid the problem that the outer rotating end in the extended state will hit the support module 1 and cause it to get stuck when the adjustment component and the joint beam segment 4 rotate. The width of the joint beam segment 4 and the fixed beam segment 5 are equal. In order to ensure that the joint beam segment 4 can be transported on the fixed beam segment 5, the length of the joint beam segment 4 needs to be less than the width of the fixed beam segment 5, so that the width direction of the joint beam segment 4 and the width direction of the fixed beam segment 5 are in a vertical state, so that the joint beam segment 4 can be easily moved; after hoisting, the joint beam segment 4 is rotated 90 degrees until the width direction of the joint beam segment 4 and the width direction of the fixed beam segment 5 are in line, and then the adaptive installation is carried out. The length of a single side support beam 34 is approximately 0.8 times the width of a single fixed beam segment 5, and the total length of the two side support beams 34 in a collinear state is approximately 1.6 times the width of a single fixed beam segment 5, that is, the total length of the two side support beams 34 in a collinear state is greater than the width of the fixed beam segment 5; the inclined cable 51 and the support module 1 are installed at the edge position of the fixed beam segment 5, so after the joint beam segment 4 is rotated 90 degrees and then the side support beam 34 is rotated out, the problem of the side support beam 34 and the inclined cable 51 / support module 1 colliding / getting stuck with each other can be avoided.

[0060] Reference Figures 8 to 10 . An oblique support arm 343 is provided in the outer rotating end, which can be rotated out to point obliquely upward and abut against the second crossbeam 32, thereby forming an upright triangular support structure to prevent the side support beam 34 from being overloaded and bent. An abutting hydraulic cylinder 344 is provided in the inner cavity of the end of the oblique support arm 343 close to the second crossbeam 32. The output shaft of the abutting hydraulic cylinder 344 can extend from the inner cavity of the oblique support arm 343 to engage with the abutting oblique hole 322 on the side wall of the second crossbeam 32. The oblique support arm 343, the abutting hydraulic cylinder 344, the second crossbeam 32 and the side support beam 34 form a stable triangular support structure, thereby improving the load-bearing capacity of the side support beam 34 and preventing the side support beam 34 from being compressed and bent.

[0061] The abutment oblique hole 322 is an arc-shaped blind hole. Because the second crossbeam 32 can swing relative to the first crossbeam 31, the side support crossbeam 34 and the abutment hydraulic cylinder 344 also swing relative to the first crossbeam 31. Therefore, when the abutment hydraulic cylinder 344 extends the output shaft in the tilted state, the output shaft end can be adapted to be inserted into the arc-shaped abutment oblique hole 322.

[0062] Reference Figure 9A gap is provided between the bottom surface of the side support beam 34 and the top surface of the joint beam segment 4 to prevent friction between the bottom surface and the top surface of the joint beam segment 4, which would make it difficult to rotate the side support beam 34. Since the top surface of the joint beam segment 4 and the top surface of the fixed beam segment 5 need to be kept flush with each other in the supporting state, a gap is also required between the bottom surface of the side support beam 34 and the top surface of the fixed beam segment 5. The end of the diagonal bracing arm 343 away from the second crossbeam 32 is provided with a downward extension protrusion 3431 (for example, through an integrated fixed connection); the downward extension protrusion 3431 is used to press the fixed beam segment 5 to compensate for the gap between the side support beam 34 and the fixed beam segment 5.

[0063] Reference Figure 9 The side support beam 34 has an opening at the top for accommodating a diagonal support arm 343. The bottom end of the diagonal support arm 343 is inserted into the accommodating cavity 342 and is rotatably connected (e.g., hingedly connected) to the side support beam 34. A lifting hydraulic cylinder 345 is installed in the accommodating cavity 342. The bottom end of the lifting hydraulic cylinder 345 is hingedly connected to the side support beam 34 and the top end is hingedly connected to the middle of the diagonal support arm 343. The lifting hydraulic cylinder 345 can drive the diagonal support arm 343 to rotate out of the accommodating cavity 342 or retract into the accommodating cavity 342.

[0064] Reference Figure 9 When the triangular support structure is complete, the diagonal bracing arm 343 is tilted, causing the downward projection 3431 to tilt downward and press against the fixed beam segment 5. When the diagonal bracing arm 343 rotates until it abuts the hydraulic cylinder 344 and enters the accommodating chamber 342, the diagonal bracing arm 343 is nearly horizontal, causing the downward projection 3431 to rotate upward. Therefore, during the rotation of the side support beam 34, the downward projection 3431 does not contact or rub against the closure beam segment 4, allowing the side support beam 34 to rotate smoothly in and out. The side wall of the accommodating chamber 342, away from the second crossbeam 32, is open. This opening is used to accommodate the downward projection 3431 and drain water (e.g., rainwater) that accumulates within the accommodating chamber 342.

[0065] Reference Figure 9 The bottom surface of the downwardly extending protrusion 3431 is fixed with an anti-slip layer 34311 (for example, fixed by bolts or adhesive). The anti-slip layer 34311 is made of rubber material to increase friction with the fixed beam segment 5.

[0066] Reference Figure 10 and Figure 11 Under the tension of the joint beam segment 4 and the support of the fixed beam segment 5, the side support beam 34 has a tendency to rotate vertically, and the first shaft 341 will be subjected to a large bending moment. In order to avoid the problem of overload bending of the first shaft 341, refer to Figure 11The bottom surface of the first crossbeam 31 is provided with a downward extension plate 311 (for example, fixedly connected by bolts or fixedly connected in one piece), and the lower middle part of the downward extension plate 311 is provided with a pulling assembly 312, and the pulling assembly 312 can pull the inner rotating end upward, thereby avoiding the problem that the inner rotating end has a sinking tendency due to lack of connection, that is, the pulling assembly 312 can pull the inner rotating end upward to avoid the sinking of the joint beam segment 4; at the same time, under the pulling of the pulling assembly 312, the two side support beams 34 have higher straightness, and the first crossbeam 31, the second crossbeam 32, the side support beam 34 and the pulling assembly 312 constitute a dish-shaped load-bearing structure, which can greatly reduce the bending moment borne by the first rotating shaft 341 (the problem of sinking of the inner rotating end will further increase the bending degree of the first rotating shaft 341).

[0067] Reference Figure 11 The connecting assembly 312 includes two L-shaped connecting claws 3121. The connecting claws 3121 include a bottom plate and a vertical plate fixedly connected in an L-shape. The vertical plate is fixedly installed on the side wall of the lower vertical plate 311 (for example, fixed by bolts or fixed by welding), and the bottom plate is located below the lower vertical plate 311. A transverse slot is formed between the bottom plate of the connecting claw 3121 and the lower vertical plate 311. The openings of the two transverse slots point to both sides of the lower vertical plate 311 to adapt to the inner rotating end from both sides. The connecting claw 3121 applies a clamping force and an upward connecting force to the inner rotating end. The two transverse slots are arranged in a centrally symmetrical shape with the center position of the bottom surface of the lower vertical plate 311 as the center.

[0068] Reference Figures 11 to 14 The bottom surface of the inner rotating end is provided with a bottom arc surface 346. The rotation center (e.g., hinge axis) at the rotational connection position of the first crossbeam 31 and the second crossbeam 32 is adapted to the bottom arc surface 346 (coaxial arrangement). The upper surface of the bottom plate is provided with a fitting arc surface 31211 adapted to the bottom arc surface 346 and a horizontal clamping plane 31212 tangent to the fitting arc surface 31211. Since the second crossbeam 32 rotates relative to the first crossbeam 31, the side support crossbeam 34 and the inner rotating end will also rotate relative to the first crossbeam 31. Therefore, the inner rotating end may present different inclination angles instead of always being in a standard vertical state. The present invention can greatly improve the compatibility with the inclination angle of the inner rotating end, that is, whether the inner rotating end is vertical or inclined, it can be adapted and pressed with the upper surface of the bottom plate (fitting arc surface 31211 or horizontal clamping plane 31212).

[0069] Reference Figure 13 The horizontal card plane 31212 is used to ensure that the inner rotating end can be smoothly placed in the horizontal card slot when it rotates horizontally.

[0070] Reference Figure 14 and Figure 15Since the side support beam 34 does not rotate around itself, it has horizontal movement while tilting, so the inward rotating end will be stuck at different positions on the top surface of the base plate; therefore, an extension arc surface 31213 is provided at the end of the fitting arc surface 31211 away from the horizontal clamping plane 31212, and an extension plane 31214 is provided at the end of the horizontal clamping plane 31212 away from the fitting arc surface 31211. The extension arc surface 31213 and the extension plane 31214 are both used to adapt to and support the inward rotating end that is stuck in an inclined shape.

[0071] Reference Figure 14 and Figure 15 A clearance groove 31215 is provided at the bottom end of the side wall of the vertical plate close to the bottom plate, and the clearance groove 31215 is used to accommodate the inclined inward rotating end side wall.

[0072] Reference Figure 16 , a limiting oil cylinder 347 is provided in the inner cavity of one inner rotating end (for example, fixedly connected by bolts), and the output shaft of the limiting oil cylinder 347 can extend from the end face of the inner rotating end and be inserted into the limiting hole 348 of the end face of the other inner rotating end, so that the two side support beams 34 remain coaxial and avoid falling out of the transverse slot. When the end faces of the two inner rotating ends are arranged relative to each other, that is, when the two side support beams 34 are coaxially arranged, the output shaft of the limiting oil cylinder 347 is adapted to the limiting hole 348. The two side support beams 34 are coaxially arranged by the limiting oil cylinder 347, and the left and right sides of the inner rotating end are provided with pulling claws 3121 for stopping, thereby limiting the side support beams 34, preventing the side support beams 34 from falling out of the pulling assembly 312, and improving the structural stability of the present invention.

[0073] Reference Figure 17 The bottom arc surface 346 is located at the middle of the side support beam 34, and a cavity is formed below the bottom arc surface 346. The cavity is used to provide a space for the bottom plate of the connecting claw 3121. After the bottom plate is inserted into the cavity, the inner rotating end is engaged with the connecting claw 3121. The limit cylinder 347 is installed above the bottom arc surface 346.

[0074] A construction method for closure of a steel box girder mid-span, that is, using a bridge crane for closure of a steel box girder mid-span to perform closure construction on a bridge, comprises the following steps:

[0075] S1. Connect the lower extension plate 321 and the lug plate 41 with bolts.

[0076] S2. When both the external rotation end and the internal rotation end are placed in the suspension gap 3201, the joint beam segment 4 is hoisted, moved horizontally, and rotated until the joint beam segment 4 is located above the gap between the fixed beam segments 5 and adapts to the gap (direction and position).

[0077] S3. Rotate the side support beam 34 until it is perpendicular to the second beam 32, and the inwardly rotating ends of the two side support beams 34 are both engaged in the pulling assembly 312. At this time, the end surfaces of the two inwardly rotating ends are arranged opposite to each other.

[0078] S4. The output shaft of the limiting oil cylinder 347 extends out and is inserted into the limiting hole 348, thereby realizing the limiting fixation of the side support beam 34; then the diagonal support arm 343 extends out, and then the output shaft of the abutting hydraulic cylinder 344 extends out from the diagonal support arm 343 and is stuck into the abutting inclined hole 322, forming a triangular support structure.

[0079] S5. Lower the closure beam segment 4 and insert it into the gap until the triangular support structure and the fixed beam segment 5 are press-fitted (indirect press-fitting is achieved using the downward extension protrusion 3431).

[0080] S6. Temporarily connect the closure beam segment 4 and the fixed beam segment 5 using a spar 42. One end of the spar 42 is welded to the closure beam segment 4, and the other end is welded to the fixed beam segment 5. Multiple spar 42 are provided, located on both sides of the side support beam 34, to maintain the balance of the closure beam segment 4 and prevent it from tilting.

[0081] S7. The closure beam segment 4 is permanently fixed to the fixed beam segment 5 (for example, by welding or by high-strength bolts), and then the code plate 42 is removed (for example, by cutting).

[0082] S8. Remove the bolts between the lower extension plate 321 and the lifting lug plate 41 to separate the lower extension plate 321 from the lifting lug plate 41, and then remove the adjustment module 3.

[0083] The first linear drive 310 , the second linear drive 320 , the abutting hydraulic cylinder 344 , the lifting hydraulic cylinder 345 , and the limiting oil cylinder 347 are all conventional hydraulic cylinders and are respectively connected and communicated with an oil pump through oil pipes, and the oil pump is connected and communicated with an oil tank.

[0084] The present invention also includes an electrical cabinet, which is fixedly installed in the inner cavity of the first crossbeam 31 by bolts; the first motor, transverse pulley, winch, second motor, and oil pump are respectively connected to the electrical cabinet through wires and signal lines; the electrical cabinet is connected to the external power supply and external computer through wires and signal lines, and the computer controls the start and stop and other working states of the first motor, transverse pulley, winch, second motor, and oil pump in the present invention through the electrical cabinet.

[0085] The present invention has a simple structure and reliable functions. The side support beam 34 can be rotated out laterally and pressed onto the fixed beam segment 5. The friction between the side support beam 34 and the fixed beam segment 5 is used to improve the stability of the joint beam segment 4, avoiding the problem of difficulty in installing the first code plate 42 due to the shaking of the joint beam segment 4; at the same time, it ensures that the top surface of the joint beam segment 4 and the top surface of the fixed beam segment 5 can be aligned to facilitate permanent fixed connection in the later stage.

[0086] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0087] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections, or integral connections; mechanical or electrical connections; direct connections or connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0088] To sum up, for those skilled in the art, according to the guidance of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, replacements and deformations made to the present invention still fall within the scope of protection of the present invention.

Claims

1. A bridge crane for closing the mid-span of a steel box girder, characterized by: It comprises a support module (1) crimped and fixed on a fixed beam segment (5), a lifting module (2) connected to the support module (1), and an adjustment module (3) connected to the lifting module (2); The regulating module (3) comprises a first crossbeam (31) and two second crossbeams (32) arranged in an I-shape; the middle portion of the second crossbeam (32) is arranged below the end portion of the first crossbeam (31); a lower extension plate (321) is provided on the lower bottom surface of the second crossbeam (32); the lower extension plate (321) is detachably connected to the lug plate (41) on the top surface of the joint beam segment (4); A suspension gap (3201) is provided between the second crossbeam (32) and the joint beam segment (4), and a side support crossbeam (34) is provided in the suspension gap (3201), the middle portion of which is rotatably connected to the second crossbeam (32); the outer rotation end of the side support crossbeam (34) can be rotated out of the suspension gap (3201) and pressed onto the fixed beam segment (5) to support the joint beam segment (4), and the inner rotation end can be rotated out of the suspension gap (3201) and pulled into connection with the lower surface of the first crossbeam (31); The outer rotating end is provided with an oblique support arm (343) that can be rotated out to point obliquely upward and abut against the second crossbeam (32), thereby forming a vertical triangular support structure to prevent the side support crossbeam (34) from being overloaded and bent.

2. The bridge crane for mid-span closure of steel box girders according to claim 1, characterized in that: An abutting hydraulic cylinder (344) is provided in the inner cavity of the end of the diagonal bracing arm (343) close to the second cross beam (32), and the output shaft of the abutting hydraulic cylinder (344) can extend from the inner cavity of the diagonal bracing arm (343) to engage with the abutting inclined hole (322) on the side wall of the second cross beam (32).

3. The bridge crane for mid-span closure of steel box girders according to claim 2, characterized in that: The end of the diagonal support arm (343) away from the second cross beam (32) is provided with a downwardly extending protrusion (3431); the downwardly extending protrusion (3431) is used to press the fixed beam segment (5) to compensate for the gap between the side support cross beam (34) and the fixed beam segment (5).

4. The bridge crane for mid-span closure of a steel box girder according to claim 3, characterized in that: The side support beam (34) is provided with a receiving cavity (342) with a top opening and used to receive the diagonal support arm (343). A lifting hydraulic cylinder (345) is installed in the receiving cavity (342). The bottom end of the lifting hydraulic cylinder (345) is hinged to the side support beam (34) and the top end is hinged to the middle of the diagonal support arm (343).

5. The bridge crane for mid-span closure of steel box girders according to claim 4, characterized in that: A downwardly extending vertical plate (311) is provided on the bottom surface of the first crossbeam (31), and a pulling assembly (312) is provided at the lower middle portion of the downwardly extending vertical plate (311). The pulling assembly (312) is capable of pulling the inner rotating end upward to prevent the joint beam segment (4) from sinking.

6. The bridge crane for closure of mid-span steel box girders according to claim 5, characterized in that: The connecting assembly (312) comprises two L-shaped connecting claws (3121), a transverse slot being provided between the connecting claws (3121) and the lower extending vertical plate (311), and the openings of the two transverse slots respectively pointing to both sides of the lower extending vertical plate (311) to adapt and engage the inner rotating end from both sides.

7. The bridge crane for mid-span closure of a steel box girder according to claim 6, characterized in that: A limiting oil cylinder (347) is provided in the inner cavity of one of the inner rotating ends, and an output shaft of the limiting oil cylinder (347) can extend from the end face of the inner rotating end and be inserted into a limiting hole (348) on the end face of the other inner rotating end, so that the two side support beams (34) remain coaxial and avoid falling out of the transverse slot.

8. The bridge crane for mid-span closure of steel box girders according to claim 7, characterized in that: The bottom surface of the inner rotating end is provided with a bottom arc surface (346), and the pulling claw (3121) comprises a vertical plate and a bottom plate connected in an L-shape, and the upper surface of the bottom plate is provided with a fitting arc surface (31211) adapted to the bottom arc surface (346) and a horizontal clamping plane (31212) tangent to the fitting arc surface (31211).

9. The bridge crane for mid-span closure of a steel box girder according to claim 8, characterized in that: An extension arc surface (31213) is provided at one end of the fitting arc surface (31211) away from the transverse clamping plane (31212), and an extension plane (31214) is provided at one end of the transverse clamping plane (31212) away from the fitting arc surface (31211) for adapting to the inward rotating end that is clamped in an inclined manner.

10. A construction method for closure of mid-span of steel box girder, characterized in that: The steps of carrying out bridge closure construction using the bridge deck crane for mid-span closure of steel box girders according to claim 9 include: S1, connecting the lower extension plate (321) and the lug plate (41); S2, in a state where both the outer rotating end and the inner rotating end are placed in the suspension gap (3201), the joint beam segment (4) is hoisted, moved horizontally, and rotated until the joint beam segment (4) is located above the gap between the fixed beam segments (5) and fits into the gap; S3, rotating the side support beam (34) until it is perpendicular to the second beam (32), and the inner rotation end is clamped into the pull-connecting assembly (312); S4, the output shaft of the limiting oil cylinder (347) extends out and is inserted into the limiting hole (348); S5, lowering the joint beam segment (4) and inserting it into the notch until the triangular support structure and the fixed beam segment (5) are pressed together; S6, temporarily connecting the joint beam segment (4) and the fixed beam segment (5) using a yard plate (42); S7, permanently fixing the joint beam segment (4) and the fixed beam segment (5), and then removing the yard plate (42); S8. Disassemble the lower extension plate (321) and the lug plate (41).

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