Lifting stations and jacking processes suitable for steel box girder web variations

Abstract

The present invention discloses a beam-lifting station suitable for the web change of a steel box girder, comprising a main beam, a movable support, a fixed support, a sling, and a lifting mechanism. The fixed support comprises two parts detachably connected up and down, the lower end of the movable support is arranged as a sliding support on the jacking steel box girder, the main beam is arranged along the longitudinal direction of the bridge, the transverse width of the fixed support and the movable support is adjustable, the sling is connected by a lifting mechanism, and the lifting mechanism is arranged to move along the longitudinal direction of the main beam. The present invention also discloses a jacking process of a beam-lifting station suitable for the web change of a steel box girder. According to the needs of assembling the web of the steel box girder and the jacking direction, the present invention designs the beam-lifting station into a plurality of adjustable modes to adapt to the width and position changes of the web of the steel box girder, and to adapt to the jacking requirements of the steel box girder in different directions, without the need to repeatedly disassemble and assemble the beam-lifting station structure, and to perform structural function conversion in a safe and efficient manner to ensure construction requirements.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction equipment, and more particularly to a beam lifting station and a top-pushing process thereof suitable for changing the web of a steel box beam. Background Art

[0002] In bridge construction, beam lifting stations are widely used when large-section steel box girder components are lifted or installed as a whole. However, due to the different design structures of different large-section box girders, especially when lifting steel box girders of different cross-section types and stress characteristics at one location, there are certain requirements for the structural layout of the beam lifting station and the stress safety of the steel box girder to meet the requirements of safe construction.

[0003] At the same time, during the jacking construction of the steel box girder bridge, the beam-lifting station structure with its legs falling on the bridge deck needs to adapt to the changes in the positional relationship between the beam-lifting station and the steel box girder during the jacking process to avoid the influence of adverse force forms and ensure structural safety.

[0004] The steel box girder lifting station usually used for jacking has a wide steel box girder, so one end of the support legs are usually placed on the steel box girder and the other end is fixed. It is only suitable for jacking in one direction, and the support legs of the lifting station need to correspond to the position of the web of the steel box girder. When the width, position and jacking direction of the web of the steel box girder change, the previous structure is often no longer suitable for the lifting and jacking process, and the force form of the original structure needs to be changed to meet the new requirements. Summary of the invention

[0005] One object of the present invention is to provide a beam-lifting station and a jacking process thereof that are suitable for changes in the web of a steel box girder. According to the needs of assembling the web of the steel box girder and the jacking direction, the beam-lifting station is designed to have multiple adjustable modes to adapt to changes in the width and position of the web of the steel box girder and to adapt to the jacking requirements of the steel box girder in different directions without the need to repeatedly disassemble and assemble the beam-lifting station structure. Structural function conversion is carried out in a safe and efficient manner to ensure construction needs.

[0006] In order to achieve these purposes and other advantages according to the present invention, there is provided a beam lifting station suitable for the web change of a steel box girder, comprising a main beam, a movable support, a fixed support, a hoist, and a lifting mechanism, wherein the fixed support comprises two parts which are detachably connected up and down, the lower end of the fixed support is arranged to be detachably fixed on a temporary pier, the lower end of the movable support is arranged to be slidably supported on a top-pushing steel box beam, the main beam is arranged along the longitudinal direction of the bridge and the two ends are respectively connected to the upper ends of the fixed support and the movable support, the transverse direction of the fixed support and the movable support comprises a plurality of structural units which are detachably combined so that the fixed support and the movable support can adjust the transverse width, the hoist is connected via a lifting mechanism, the lifting mechanism is arranged to move along the longitudinal direction of the main beam, and the hoist is used to lift the steel box beam.

[0007] Preferably, the movable support includes a pair of movable legs, which are arranged at intervals along the lateral direction, and the pair of movable legs are connected by a connecting beam with adjustable length. The fixed support includes a pair of fixed legs, which are arranged at intervals along the lateral direction, and the upper parts of the pair of fixed legs are also connected by a connecting beam with adjustable length. The main beams are a pair and are arranged at intervals along the lateral direction. Each pair of main beams includes a pair of longitudinal beams, and the pair of longitudinal beams are connected as a whole by multiple transverse links. The two ends of each pair of main beams are respectively connected to a fixed leg and a movable leg in the same longitudinal direction.

[0008] Preferably, the upper end of the movable support is connected to the main beam via two or one hinge supports, and the upper end of the fixed support is connected to the main beam via one or two hinge supports.

[0009] Preferably, the fixed support leg includes a transverse pulley, a distribution beam, a steel pipe column, a longitudinal slide, a fixed frame, and a hinge support which are arranged in sequence from bottom to top. The steel pipe columns are four and constitute a frame structure. The distribution beams are a pair which are arranged opposite to each other in the longitudinal direction. The pair of distribution beams are respectively fixedly connected to the lower ends of two steel pipe columns in the same transverse direction. A transverse pulley is arranged under the distribution beam corresponding to the position of each steel pipe column, which is arranged to slide in cooperation with the track. The fixed frame is detachably connected to the top ends of the four steel pipe columns. The hinge support connects the main beam and the top end of the fixed frame. The longitudinal slide is hinged to the bottom center of the fixed frame. The connecting beam is connected to the fixed frame.

[0010] Preferably, the movable support leg includes a transverse pulley, a longitudinal slide, a distribution beam, a steel pipe column, and a hinge support which are arranged in sequence from bottom to top. The steel pipe columns are four and constitute a frame structure. The distribution beams are a pair arranged opposite to each other in the longitudinal direction. A pair of distribution beams are respectively fixedly connected to the lower ends of two steel pipe columns in the same transverse direction. Two transverse pulleys and two longitudinal slides are respectively arranged at the positions corresponding to the two steel pipe columns under the distribution beam in the same transverse direction. The hinge support connects the main beam and the top end of the steel pipe column.

[0011] Preferably, the lower end of the movable leg is slidably supported on the top-pushing steel box girder through a sliding track, the sliding track is detachably connected to the steel box girder, and the sliding track is an assembled structure.

[0012] Preferably, the lifting mechanism moves longitudinally along the main beam through a longitudinal positioning system, and the longitudinal positioning system includes a longitudinal movement track, an adjustment base, a connecting beam, an adjustment reaction seat and an adjustment cylinder. The longitudinal movement track is longitudinally laid on the main beam, the adjustment base is a pair and is slidably arranged on the longitudinal movement track at intervals, the pair of adjustment bases are connected by a connecting beam, the adjustment reaction seat is fixed on the main beam, the cylinder body of the adjustment cylinder is fixed on the adjustment reaction seat, the telescopic rod of the adjustment cylinder is connected to the adjustment base, and the lifting mechanism is fixed on the adjustment base.

[0013] Preferably, the sling includes a connecting anchor head, a matching beam, and an ear plate. The connecting anchor head is connected to the lifting mechanism, the middle part of the matching beam is connected to the connecting anchor head through a pin, the ear plates are in three groups and are arranged at intervals on the matching beam, and each group of ear plates is connected to the steel box beam through a connecting pin.

[0014] Preferably, the fixed legs are anchored on the temporary pier through temporary supports and precision-rolled threaded steel bars, the temporary supports are supported between the distribution beam and the upper surface of the temporary pier, and the precision-rolled threaded steel bars threadably connect the distribution beam and the temporary pier.

[0015] The present invention also discloses a beam lifting station top-pushing process applicable to the web change of a steel box beam, comprising the following steps:

[0016] Step 1: After the side push of the movable outrigger is completed, the lock of the fixed outrigger is released, that is, the temporary support and the fine-rolled threaded steel are removed, and the connecting beams of the movable outrigger and the fixed outrigger are removed respectively, and the beam lifting station is converted to the outriggers on both sides of the lateral side to bear the force;

[0017] Step 2: The main beams and the movable legs and fixed legs on both sides of the beam lifting station are moved horizontally respectively. After the horizontal movement meets the requirements of the steel box beam web, temporary locks are installed to fix each leg, and then the connecting beam is installed to connect the fixed legs or movable legs on both sides of the horizontal direction;

[0018] Step 3: Switch the hinged supports of the movable legs and fixed legs under the main beam of the beam lifting station, prepare for reversal, install the assembly platform on the movable leg side to the fixed leg side, and prepare for jacking;

[0019] Step 4: After the jacking preparation is completed, pass the pair of longitudinal beams of the jacking guide beam through the space inside the pair of fixed legs respectively, and then install the cross beam between the pair of main beams;

[0020] Step 5: Lay the sliding track on the longitudinal beam of the guide beam, fit the longitudinal slide on the fixed leg on the sliding track, remove the lower structure of the fixed leg, install the steel box girder normally and push it forward.

[0021] The present invention has at least the following beneficial effects:

[0022] The beam-lifting station of the present invention can adapt to the changes in the height and slope of the steel box girder during the jacking construction of the steel box girder, and can also adapt to the adverse effects of different web widths and changes in web widths of the steel box girder. At the same time, it can also meet the influence of changes in the force system after changes in different jacking directions, especially during the bidirectional jacking construction of multi-link variable web steel box girders. Through this design method, the lifting operation of the beam-lifting station and the conversion construction of the width of the beam-lifting station and the jacking direction can be realized at one point, without the need for repeated disassembly and assembly, and the construction efficiency is high.

[0023] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the beam lifting station of the present invention;

[0025] Figure 2 It is a front view of the fixed support leg of the present invention;

[0026] Figure 3 It is a side view of the fixed leg of the present invention when it is not reversed;

[0027] Figure 4 It is a side view of the fixed leg of the present invention after the direction is changed;

[0028] Figure 5 It is a front view of the movable leg of the present invention;

[0029] Figure 6 It is a side view of the movable leg of the present invention when it moves laterally;

[0030] Figure 7 A top view of the main beam of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the longitudinal positioning system of the present invention;

[0032] Fig. 9 It is a structural schematic diagram of the sling of the present invention;

[0033] Fig.10 It is a schematic diagram of the structure of the anchoring of the fixed legs of the present invention;

[0034] Fig.11 It is a schematic diagram of the side pushing structure of the movable outrigger of the present invention;

[0035] Fig.12 This is a schematic diagram of the side pushing structure of the fixed support leg of the present invention;

[0036] Fig.13 This is a structural schematic diagram of step 1 of the jacking process of the present invention;

[0037] Fig.14 This is a structural schematic diagram of step three of the push-up process of the present invention;

[0038] Fig.15 This is a structural schematic diagram of step 4 of the push-up process of the present invention;

[0039] Fig.16 This is a structural schematic diagram of step five of the pushing process of the present invention.

[0040] Description of reference numerals:

[0041] 1. Fixed outriggers, 11. Transverse pulley, 12. Distribution beam, 13. Steel pipe column, 14. Longitudinal slide, 15. Fixed frame, 16. Hinge support, 17. Connecting beam, 18. Temporary support, 19. High-quality rolled threaded steel, 2. Movable outriggers, 3. Main beam, 4. Steel box beam, 5. Temporary pier, 6. Lifting mechanism, 7. Sliding track, 8. Hoist, 81. Connecting anchor head, 82. Matching beam, 83. Ear plate, 9. Longitudinal positioning system, 91. Longitudinal track, 92. Positioning base, 93. Connecting beam, 94. Positioning reaction seat, 95. Positioning cylinder. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0043] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] like Figure 1As shown, the present invention provides a beam lifting station suitable for the change of the web of a steel box girder, comprising a main beam 3, a movable support, a fixed support, a hoist 8, and a lifting mechanism 6, wherein the fixed support comprises two parts detachably connected up and down, the lower end of the fixed support is arranged to be detachably fixed on a temporary pier 5, the lower end of the movable support is arranged to be a sliding support on a top-pushing steel box beam 4, the main beam 3 is arranged along the longitudinal direction of the bridge and the two ends are respectively connected to the upper ends of the fixed support and the movable support, the transverse direction of the fixed support and the movable support comprises a plurality of structural units detachably combined so that the fixed support and the movable support can adjust the transverse width, the hoist 8 is connected via the lifting mechanism 6, the lifting mechanism 6 is arranged to move longitudinally along the main beam 3, and the hoist 8 is used to lift the steel box beam 4.

[0045] In the above technical solution, if Figure 1 As shown in FIG. 1 , the fixed support and the movable support connect the main beam 3 to form the structure of the entire beam lifting station. The switching process is as follows: Fig.11 As shown, the movable support side pushes the steel box beam 4, and the fixed support is fixed on the temporary pier 5 and does not move, ensuring the stability of the entire beam lifting station. The movable support and the steel box beam 4 maintain relative sliding. A track can be set on the steel box beam 4, and the lower end of the movable support slides in the track; Fig.12 As shown, the pushing direction is reversed, and the fixed support side pushes the steel box girder 4. First, the upper and lower parts of the fixed support are disassembled, and the lower part is disassembled. A slide rail is set on the steel box girder 4, and the upper part of the fixed support is slid on the steel box girder 4 to realize the pushing of the steel box girder 4. At this time, the movable support is fixed on the steel box girder 4. The web change process of the steel box girder 4: the fixed support and the movable support include multiple structural units in the transverse direction, and are detachably connected. According to the change of the web of the steel box girder 4, the redundant structural units are disassembled or more structural units are assembled to realize the beam lifting station to adapt to the change of the web of the steel box girder 4. The steel box girder 4 is connected to the beam lifting station through the hoist 8, and the steel box girder 4 is lifted by the lifting mechanism 6. The lifting mechanism 6 can move longitudinally along the main beam 3 to realize the longitudinal walking and positioning pushing of the steel box girder 4. The lifting mechanism 6 includes a lifting jack system and a steel strand winding device to lift the steel box girder 4 as a whole. The lifting jack system is the power to lift the steel box girder 4 upward, and the steel strand winding device is to wind the steel strand used by the lifting jack system into a coil to prevent disturbance or damage.

[0046] In another technical solution, Figures 2 to 7As shown, the movable support includes a pair of movable legs 2, which are arranged at intervals along the lateral direction, and the pair of movable legs 2 are connected by a connecting beam 17 with adjustable length. The fixed support includes a pair of fixed legs 1, which are arranged at intervals along the lateral direction, and the upper parts of the pair of fixed legs 1 are also connected by a connecting beam 17 with adjustable length. The main beams 3 are a pair and are arranged at intervals along the lateral direction. Each pair of main beams 3 includes a pair of longitudinal beams, and the pair of longitudinal beams are connected as a whole by multiple transverse links. The two ends of each pair of main beams 3 are respectively connected to a fixed leg 1 and a movable leg 2 in the same longitudinal direction.

[0047] In the above technical solution, the fixed support and the movable support each include a pair of legs, and the pair of legs are connected by a connecting crossbeam 17. The length of the connecting crossbeam 17 is adjustable, that is, the spacing between the pair of legs is adjustable, that is, the width of the fixed support and the movable support is adjustable to adapt to the change of the web of the steel box girder 4. The connecting crossbeam 17 is detachably assembled from a plurality of structural units, and is assembled into a suitable length as required to meet the construction requirements. The main beam 3 mainly includes a longitudinal beam and a cross-link. The longitudinal beam mainly bears the hoisting load, and the cross-link mainly stabilizes the longitudinal beam.

[0048] In another technical solution, Fig.11 and Fig.12 As shown, the upper end of the movable support is connected to the main beam 3 via two or one hinge supports 16 , and the upper end of the fixed support is connected to the main beam 3 via one or two hinge supports 16 .

[0049] In the above technical solution, if Fig.11 As shown, when the movable support is pushed sideways, in order to adapt to the height difference and longitudinal position changes between the movable support and the steel box beam 4 during the pushing process, a hinge support 16 is used at the connection between the fixed support and the main beam 3, that is, the fixed support and the main beam 3 are hinged and rotatable, and two hinge supports 16 are used between the movable support and the main beam 3 to be hinged and non-rotatable. When the beam lifting station needs to change the pushing direction, the fixed support and the movable support need to be reversed. At this time, the hinge support 16 connecting the support and the main beam 3 needs to be reversed at the same time. Fig.12 As shown, at this time, the fixed support and the main beam 3 are connected by two hinge supports 16, while the movable support and the main beam 3 are connected by two hinge supports 16.

[0050] In another technical solution, Figures 2 to 4As shown, the fixed leg 1 includes a transverse pulley 11, a distribution beam 12, a steel pipe column 13, a longitudinal slide 14, a fixed frame 15, and a hinge support 16 which are arranged in sequence from bottom to top. The steel pipe columns 13 are four and constitute a frame structure. The distribution beams 12 are a pair arranged opposite to each other in the longitudinal direction. A pair of distribution beams 12 are respectively fixedly connected to the lower ends of two steel pipe columns 13 in the same transverse direction. A transverse pulley 11 is arranged at the position corresponding to each steel pipe column 13 under the distribution beam 12, and the position is set to slide with the track. The fixed frame 15 is detachably connected to the top ends of the four steel pipe columns 13. The hinge support 16 connects the main beam 3 and the top end of the fixed frame 15. The longitudinal slide 14 is fixed to the bottom center of the fixed frame 15, and the connecting beam 17 is connected to the fixed frame 15.

[0051] In the above technical solution, when the width of the original web changes, a transverse pulley 11 is arranged at the lower end of the fixed leg 1 and the movable leg 2, and a track is laid on the steel box girder 4. The transverse pulley 11 slides on the track to achieve the overall width adjustment of the beam lifting station, and at the same time changes the length of the connecting beam 17. The overall structure of the beam lifting station does not need to be repeatedly disassembled and assembled. The transverse pulley 11 is mainly used for the overall adjustment of the fixed leg 1 side when the beam lifting station is widened. The distribution beam 12 is used to support the steel pipe column 13, and is fixedly connected to the temporary pier 5 by bolts to ensure the stable support of the fixed support. The steel pipe column 13 mainly bears the upper load. One hinge support 16 is set to adapt to the change of the jacking height, and two hinge supports 16 are set to fix the legs after changing the jacking direction. When changing direction, the lower steel pipe column 13 and other structures are removed, and the fixed frame 15 is retained for support. The fixed frame 15 is provided with a track and a longitudinal slide seat at the contact position with the steel box beam 4, which can slide longitudinally. The longitudinal slide seat is hinged to adapt to the change of the slope when the steel box beam 4 is pushed, so as to ensure uniform force. When the original web position changes from 1 to 2, the force conversion is carried out by setting another slide rail at the new web position, and the spreader 8 is also provided with a distribution beam 12 to adapt to the change of the web width position.

[0052] In another technical solution, Figure 5 and Figure 6 As shown, the movable support leg 2 includes a transverse pulley 11, a longitudinal slide 14, a distribution beam 12, a steel pipe column 13, and a hinge support 16 which are arranged in sequence from bottom to top. The steel pipe columns 13 are four and constitute a frame structure. The distribution beams 12 are a pair arranged opposite to each other in the longitudinal direction. A pair of distribution beams 12 are respectively fixedly connected to the lower ends of two steel pipe columns 13 in the same transverse direction. Two transverse pulleys 11 and two longitudinal slides 14 are respectively arranged at the positions corresponding to the two steel pipe columns 13 under the distribution beam 12 in the same transverse direction. The hinge support 16 connects the main beam 3 and the top end of the steel pipe column 13.

[0053] In the above technical solution, the movable leg 2 has the same main structure as the fixed leg 1, and the transverse pulley 11 is mainly used for the overall adjustment of the movable leg 2 side when the beam lifting station becomes wider. The longitudinal sliding seat 14 is mainly used for longitudinal sliding during the jacking process, and the longitudinal sliding seat 14 is hinged with the distribution beam 12 to adapt to the influence of angle changes. The distribution beam 12 is used to support the steel pipe column 13. The steel pipe column 13 mainly bears the upper load. A hinge support 16 is set to adapt to the change of jacking height after changing the jacking direction, and two hinge supports 16 are set for fixing the legs.

[0054] In another technical solution, the lower end of the movable leg 2 is slidably supported on the top-pushing steel box girder 4 through a sliding track 7. The sliding track 7 is detachably connected to the steel box girder 4, and the sliding track 7 is an assembled structure.

[0055] In the above technical solution, by laying the sliding track 7 on the steel box girder 4, it is ensured to slide relative to the steel box girder 4 during the pushing process. When the steel box girder 4 is pushed on the movable support side, the movable support and the sliding track 7 are set to slide relative to each other, that is, the longitudinal sliding seat 14 is slidably set on the sliding track 7; when the web width of the steel box girder 4 changes, the sliding track 7 is removed and arranged horizontally, and at this time, the transverse sliding boat 11 slides on the sliding track 7 to realize the lateral movement of the movable support leg 2, thereby adapting to the change in web width. After the fixed support side is reversed, the sliding track 7 is laid to realize longitudinal relative movement.

[0056] In another technical solution, Figure 8 As shown, the lifting mechanism 6 moves longitudinally along the main beam 3 through the longitudinal positioning system 9, and the longitudinal positioning system 9 includes a longitudinal movement rail 91, a positioning base 92, a connecting beam 93, a positioning reaction seat 94 and a positioning cylinder 95. The longitudinal movement rail 91 is longitudinally laid on the main beam 3, and the positioning base 92 is a pair and is slidably arranged on the longitudinal movement rail 91 at intervals. The pair of positioning bases 92 are connected by a connecting beam 93, and the positioning reaction seat 94 is fixed on the main beam 3. The cylinder body of the positioning cylinder 95 is fixed on the positioning reaction seat 94, and the telescopic rod of the positioning cylinder 95 is connected to the positioning base 92, and the lifting mechanism 6 is fixed on the positioning base 92.

[0057] In the above technical solution, the beam lifting station adjusts the longitudinal position of the steel box beam 4 through the longitudinal positioning system 9 on the top surface of the main beam 3. A plurality of lifting mechanisms 6 can be provided, and a plurality of corresponding positioning bases 92 are also provided. Adjacent positioning bases 92 are connected as a whole through a connecting beam 93. The longitudinal movement track 91 is installed and fixed above the main beam 3. Through the extension and contraction of the positioning cylinder 95, the positioning base 92 and the positioning reaction seat 94 can slide and adjust above the longitudinal movement track 91 to meet the requirements of the longitudinal installation position of the steel box beam 4.

[0058] In another technical solution, Fig. 9 As shown, the sling 8 includes a connecting anchor head 81, a matching beam 82, and an ear plate 83. The connecting anchor head 81 is connected to the lifting mechanism 6. The middle part of the matching beam 82 is connected to the connecting anchor head 81 through a pin. The ear plates 83 are divided into three groups and are arranged at intervals on the matching beam 82. Each group of ear plates 83 is connected to the steel box beam 4 through a connecting pin.

[0059] In the above technical solution, the connecting anchor head 81 is mainly connected to the lower clamping anchor of the lifting jack of the lifting mechanism 6. The connecting anchor head 81 and the matching beam 82 are connected by the anchor head connecting pin. There are connecting ear plates 83 on the matching beam 82, which are divided into 3 groups, mainly adapted to the connection of the ear plates 83 in a single position and two positions after the web plate changes. When a single position is connected to the ear plate 83 in the middle, when two positions are connected to the two ear plates 83 on both sides. The box beam connecting pin connects the entire sling 8 to the steel box beam 4.

[0060] In another technical solution, Fig.10 As shown, the fixed leg 1 is anchored on the temporary pier 5 through a temporary support 18 and a finely rolled threaded steel bar 19 . The temporary support 18 is supported between the distribution beam 12 and the upper surface of the temporary pier 5 . The finely rolled threaded steel bar 19 is threadedly connected between the distribution beam 12 and the temporary pier 5 .

[0061] In the above technical solution, the temporary support 18 and the finely rolled threaded steel bar 19 work together to firmly lock the fixed leg 1 of the beam lifting station to prevent the bottom position of the fixed leg 1 from changing. A limit clamping plate can also be provided, which matches the shape of the bottom transverse slide 11 or longitudinal slide 14 and is engaged on both sides to limit it.

[0062] The present invention also provides a beam lifting station top-pushing process applicable to the web change of steel box beams, such as Figures 13 to 16 As shown, the following steps are included:

[0063] Step 1: After the side push of the movable leg 2 is completed, the lock of the fixed leg 1 is released, that is, the temporary support 18 and the finely rolled threaded steel bar 19 are removed, and the connecting crossbeam 17 of the movable leg 2 and the fixed leg 1 are removed respectively, and the beam lifting station is converted to the legs on both sides being stressed in the horizontal direction;

[0064] Step 2: The main beam 3 and the movable legs 2 and the fixed legs 1 on both sides of the beam lifting station are moved horizontally respectively. After the horizontal movement meets the requirements of the web of the steel box beam 4, temporary locks are installed to fix each leg, and then the connecting beam 17 is installed to connect the fixed legs 1 or the movable legs 2 on both sides of the horizontal direction;

[0065] Step 3: The movable leg 2 and the fixed leg 1 under the main beam 3 of the beam lifting station are switched at the hinge support 16 to prepare for reversal, the assembly platform on the side of the movable leg 2 is installed to the side of the fixed leg 1, and preparations for jacking are made;

[0066] Step 4: After the jacking preparation is completed, a pair of longitudinal beams of the jacking guide beam are respectively passed through the space inside the pair of fixed legs 1, and then a pair of cross beams between the main beams 3 are installed;

[0067] Step 5: Lay the sliding track 7 on the longitudinal beam of the guide beam, the longitudinal sliding seat 14 on the fixed leg 1 is matched with the sliding track 7, the lower structure of the fixed leg 1 is removed, and the steel box beam 4 is installed normally and pushed forward.

[0068] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A beam lifting station suitable for steel box beam web changes, characterized in that: It includes a main beam, a movable support, a fixed support, a hoist and a lifting mechanism. The fixed support includes two parts that are detachably connected to each other. The lower end of the fixed support is configured to be detachably fixed on a temporary pier, and the lower end of the movable support is configured to be slidably supported on a top-pushing steel box beam. The main beam is arranged along the longitudinal direction of the bridge and its two ends are respectively connected to the upper ends of the fixed support and the movable support. The transverse directions of the fixed support and the movable support include a plurality of detachable structural units so that the fixed support and the movable support can adjust the transverse width. The hoist is connected through a lifting mechanism, and the lifting mechanism is configured to move along the longitudinal direction of the main beam. The hoist is used to lift the steel box beam. The movable support comprises a pair of movable legs, which are arranged at intervals in the transverse direction, and the pair of movable legs are connected by a connecting crossbeam with adjustable length. The fixed support comprises a pair of fixed legs, which are arranged at intervals in the transverse direction, and the upper parts of the pair of fixed legs are also connected by a connecting crossbeam with adjustable length. The main beams are a pair and are arranged at intervals in the transverse direction. Each pair of main beams comprises a pair of longitudinal beams, and the pair of longitudinal beams are connected as a whole through multiple transverse links. The two ends of each pair of main beams are respectively connected to a fixed leg and a movable leg in the same longitudinal direction. The fixed support leg comprises a transverse slide, a distribution beam, a steel pipe column, a longitudinal slide, a fixed frame, and a hinge support which are arranged in sequence from bottom to top. There are four steel pipe columns which constitute a frame structure. The distribution beam is a pair which are arranged opposite to each other in the longitudinal direction. A pair of distribution beams are respectively fixedly connected to the lower ends of two steel pipe columns in the same transverse direction. A transverse slide is arranged under the distribution beam corresponding to each steel pipe column, which is arranged to slide in cooperation with the track. The fixed frame is detachably connected to the top ends of the four steel pipe columns. The hinge support connects the main beam and the top end of the fixed frame. The longitudinal slide is hinged to the bottom center of the fixed frame. The connecting crossbeam is connected to the fixed frame. The lifting mechanism moves longitudinally along the main beam through a longitudinal positioning system. The longitudinal positioning system includes a longitudinal movement track, an adjustment base, a connecting beam, an adjustment reaction seat and an adjustment cylinder. The longitudinal movement track is longitudinally laid on the main beam. The adjustment base is a pair and is slidably arranged on the longitudinal movement track at intervals. The pair of adjustment bases are connected by a connecting beam. The adjustment reaction seat is fixed on the main beam. The cylinder body of the adjustment cylinder is fixed on the adjustment reaction seat. The telescopic rod of the adjustment cylinder is connected to the adjustment base. The lifting mechanism is fixed on the adjustment base.

2. The beam lifting station suitable for steel box beam web changes as claimed in claim 1, characterized in that: The upper end of the movable support is connected to the main beam via two or one hinge supports, and the upper end of the fixed support is connected to the main beam via one or two hinge supports.

3. The beam lifting station suitable for steel box beam web changes as claimed in claim 1, characterized in that: The movable support leg includes a transverse pulley, a longitudinal slide, a distribution beam, a steel pipe column, and a hinge support which are arranged in sequence from bottom to top. There are four steel pipe columns and they constitute a frame structure. The distribution beam is a pair which are arranged opposite to each other in the longitudinal direction. A pair of distribution beams are respectively fixedly connected to the lower ends of two steel pipe columns in the same transverse direction. Two transverse pulleys and two longitudinal slides are respectively arranged at the positions corresponding to the two steel pipe columns under the distribution beam in the same transverse direction. The hinge support connects the main beam and the top end of the steel pipe column.

4. The beam lifting station suitable for steel box beam web changes as claimed in claim 1, characterized in that: The lower end of the movable support leg is slidably supported on the top-pushing steel box girder through a sliding track. The sliding track is detachably connected to the steel box girder, and the sliding track is an assembled structure.

5. The beam lifting station suitable for steel box beam web changes as claimed in claim 1, characterized in that: The sling includes a connecting anchor head, a matching beam, and an ear plate. The connecting anchor head is connected to a lifting mechanism. The middle portion of the matching beam is connected to the connecting anchor head via a pin. The ear plates are in three groups and are spaced apart on the matching beam. Each group of ear plates is connected to a steel box beam via a connecting pin.

6. The beam lifting station applicable to the web change of steel box beam according to claim 1, characterized in that: The fixed legs are anchored on the temporary piers through temporary supports and precision-rolled threaded steel bars. The temporary supports are supported between the distribution beam and the upper surface of the temporary pier. The precision-rolled threaded steel bars are threadedly connected to the distribution beam and the temporary pier.

7. The beam lifting station top-pushing process applicable to steel box beam web changes according to any one of claims 1 to 6, characterized in that: The steps include: Step 1: After the side push of the movable outrigger is completed, the lock of the fixed outrigger is released, that is, the temporary support and the fine-rolled threaded steel are removed, and the connecting beams of the movable outrigger and the fixed outrigger are removed respectively, and the beam lifting station is converted to the outriggers on both sides of the lateral side to bear the force; Step 2: The main beams and the movable legs and fixed legs on both sides of the beam lifting station are moved horizontally respectively. After the horizontal movement meets the requirements of the steel box beam web, temporary locks are installed to fix each leg, and then the connecting beam is installed to connect the fixed legs or movable legs on both sides of the horizontal direction; Step 3: Switch the hinged supports of the movable legs and fixed legs under the main beam of the beam lifting station, prepare for reversal, install the assembly platform on the movable leg side to the fixed leg side, and prepare for jacking; Step 4: After the jacking preparation is completed, pass the pair of longitudinal beams of the jacking guide beam through the space inside the pair of fixed legs respectively, and then install the cross beam between the pair of main beams; Step 5: Lay the sliding track on the longitudinal beam of the guide beam, fit the longitudinal slide on the fixed leg on the sliding track, remove the lower structure of the fixed leg, install the steel box girder normally and push it forward.

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