A bridge deck lifter for steel box girder erection

Abstract

The application provides a bridge deck hoist for steel box girder installation, and relates to the field of steel box girder installation. The bridge deck hoist comprises a main truss fixed on a concrete box girder and a hoist assembly for hoisting a steel box girder, the main truss is fixed between the concrete box girder through a connecting assembly, and the hoist assembly comprises a support beam, a steel strand and a hydraulic jack, the support beam is fixed on the top of the main truss, the hydraulic jack is arranged on the support beam, and the steel strand is connected between the hydraulic jack and the steel box girder. The application has the effect of improving construction efficiency.

Description

Technical Field

[0001] This application relates to the field of steel box girder installation, and in particular to a bridge deck lifting machine for steel box girder installation. Background Technology

[0002] Steel box girders, also known as steel plate box girders, are a common structural form for long-span bridges. They are generally used on bridges with large spans and are called steel box girders because their shape resembles a box.

[0003] Currently, during bridge construction, due to the large self-weight of the steel box girder segments, it is impossible to erect supports on the water surface to support the segments. Therefore, it is necessary to hoist a segment and then use stay cables to lock the installed segment to prevent it from sinking. This process requires the use of a bridge deck crane, and the position of the bridge deck crane and the tension of the stay cables need to be readjusted after each segment is installed to ensure the correctness of the bridge curve. This increases the workload and reduces construction efficiency. Summary of the Invention

[0004] To address the issue of low construction efficiency, this application provides a bridge deck lifting machine for installing steel box girders.

[0005] This application provides a bridge deck hoist for installing steel box girders, employing the following technical solution:

[0006] A bridge deck lifting machine for installing steel box girders includes: a main truss fixed to a concrete box girder and a lifting assembly for lifting the steel box girder. The main truss and the concrete box girder are fixed together by a connecting assembly. The lifting assembly includes: a support beam, steel strands, and hydraulic jacks. The support beam is fixed to the top of the main truss, the hydraulic jacks are mounted on the support beam, and the steel strands are connected between the hydraulic jacks and the steel box girder.

[0007] By adopting the above technical solution, hydraulic jacks are activated, and then steel strands are driven to pull the steel box girder upward, thereby lifting the steel box girder. Using the already installed concrete box girder as the main support, and through the cooperation of hydraulic jacks and steel strands, the steel box girder is lifted and closed, reducing the amount of temporary supports and the workload of segmental hoisting, thus improving construction efficiency and significantly shortening the construction period; and it is less likely to excessively affect navigation.

[0008] Optionally, the connecting assembly includes: a rear anchor beam, a rear anchor rod, a pad, and a nut. The rear anchor beam is fixed to the top of the main truss. One end of the rear anchor rod passes through the rear anchor beam, and the other end passes through the concrete box girder. The pad is fitted onto the rear anchor rod and abuts against the rear anchor beam and the concrete box girder. The nut is threaded onto the rear anchor rod and abuts against the pad.

[0009] By adopting the above technical solution, during installation, the rear anchor rod is passed through the rear anchor beam and the concrete box girder. Then, a pad is placed on the rear anchor rod. The pad can increase the area between the nut and the inner wall of the rear anchor beam and the concrete box girder, thereby improving the fixing strength of the rear anchor rod and thus improving the fixing strength of the main truss. Then, the nut is tightened onto the rear anchor rod, thereby completing the fixing of the main truss.

[0010] Optionally, the main truss consists of an upper truss and a lower truss, with the upper truss fixed to the top of the lower truss, and a diagonal bracing beam fixedly provided between the upper truss and the lower truss.

[0011] By adopting the above technical solutions, the diagonal bracing beam can improve the strength between the upper and lower trusses, thereby making the overall stress distribution of the main truss more stable and safer.

[0012] Optionally, a lower pad assembly is fixedly provided at the bottom of the lower truss, the lower pad assembly including: a lower pad beam, the lower pad beam being fixed to the bottom of the lower truss.

[0013] By adopting the above technical solution, the lower support beam can level the main truss, thereby ensuring that all equipment on the main truss is in a horizontal state.

[0014] Optionally, the lower pad assembly further includes: a lower pad bamboo plywood, the lower pad bamboo plywood being fixed to the bottom of the lower pad beam, and the lower pad bamboo plywood abutting against the concrete box girder.

[0015] By adopting the above technical solution, the bamboo plywood is fixed to the bottom of the lower support beam, and the bamboo plywood is less likely to damage the concrete box girder.

[0016] Optionally, a suspension assembly is provided between the steel box girder and the main truss, and a stabilizing assembly is provided between the suspension assembly and the rear anchor rod. The suspension assembly includes: a fixed beam, a support rod, a winch, a wire rope, and a first fixed pulley. The fixed beam and the support rod are both fixed to the main truss. The winch is fixed to the fixed beam. The first fixed pulley is fixed to the steel box girder. One end of the wire rope is wound around the support rod and connected to the winch, and the other end is wound around the first fixed pulley and connected to the stabilizing assembly.

[0017] By adopting the above technical solution, the steel wire rope is also kept taut during the lifting process of the steel box girder. At the same time as the steel box girder is lifted by hydraulic jacks and steel strands, the winch also winds up the steel wire rope, thereby lifting the steel box girder as well. The two are synchronized, which can provide an extra layer of protection for the lifting of the steel box girder, so as to make it safer.

[0018] Optionally, the stabilizing component includes a pulling part, which includes a pulling rope, a guide rod, and a second fixed pulley. The guide rod is fixed to the main truss, and the second fixed pulley is fixed to the concrete box girder. The end of the wire rope away from the winch is wound around the guide rod and the second fixed pulley. One end of the pulling rope is connected to the rear anchor rod, and the other end is connected to the wire rope.

[0019] By adopting the above technical solution, during the process of hoisting the steel box girder, the steel wire rope is in a taut state to tighten the pulling rope. As a result, the pulling rope can have a pulling tendency on the rear anchor rod to the side away from the hydraulic jack, so that the rear anchor rod is not easy to bend and be damaged by moving closer to the hydraulic jack.

[0020] Optionally, the stabilizing component further includes: a clamping part, the clamping part including: a driving gear, a driven gear, a rotating rod, a support rod and a branch rope, the driven gear being fixed to the nut and the rear anchor rod passing through the driven gear, the rotating rod being rotatably mounted on the rear anchor rod, one end of the support rod being coaxially connected to the rotating rod and the other end being coaxially fixed to the driving gear, and the driving gear meshing with the driven gear, one end of the branch rope being wound around the rotating rod and the other end being fixedly connected to the pull rope.

[0021] By adopting the above technical solution, when the pull rope is in a taut state, the pull rope will also tighten the branch rope, so that the branch rope always has the tendency to pull the rotating rod clockwise and rotate. Furthermore, through the meshing of the driving gear and the driven gear, the nut can be firmly tightened on the rear anchor rod and is not easy to loosen, thereby ensuring the stability of the rear anchor rod and improving the stability of the main truss.

[0022] Optionally, a receiving plate is fixedly provided at the end of the pull rope away from the rear anchor rod, a threaded cylinder is rotatably installed on the receiving plate, and a screw is fixedly provided on the wire rope, with the screw threadedly connected to the threaded cylinder.

[0023] By adopting the above technical solution, the threaded cylinder is rotated to remove the screw from the threaded cylinder, thereby separating the pulling rope from the wire rope so that the rear anchor rod can be disassembled.

[0024] Optionally, the end wall of the rotating rod is provided with a connecting hole, and a magnetic block is fixedly provided at the bottom of the connecting hole. An iron rod is fixedly provided at the end wall of the support rod, and the iron rod is disposed in the connecting hole, and the iron rod is magnetically attracted to the magnetic block.

[0025] By adopting the above technical solution, during disassembly, pulling the support rod and rotating rod separates the iron rod, allowing it to be pulled out of the connection hole, thus facilitating the disassembly of the rear anchor rod.

[0026] In summary, this application includes at least one of the following beneficial effects:

[0027] 1. By using the pre-installed concrete box girder as the main support, and then using hydraulic jacks and steel strands to lift and close the steel box girder, the amount of temporary support and the workload of segmented hoisting can be reduced, thereby improving construction efficiency.

[0028] 2. During the process of hoisting the steel box girder with the wire rope, the wire rope is kept taut to tighten the traction rope. This allows the traction rope to pull the rear anchor rod away from the hydraulic jack, making it less likely for the rear anchor rod to bend and be damaged towards the hydraulic jack.

[0029] 3. During disassembly, pull the support rod and the rotating rod to separate them, allowing the iron rod to be pulled out of the connection hole, thus facilitating the disassembly of the rear anchor rod. Attached Figure Description

[0030] Figure 1 This is a schematic perspective view of Embodiment 1 of this application;

[0031] Figure 2 yes Figure 1 A schematic enlarged view of part A in the middle;

[0032] Figure 3 This is a schematic perspective view of Embodiment 2 of this application;

[0033] Figure 4 yes Figure 3 A schematic enlarged view of part B in the diagram;

[0034] Figure 5 yes Figure 3 A schematic enlarged view of part C in the middle;

[0035] Figure 6 This is a schematic perspective view of the connection between the rotating rod and the support rod in Embodiment 2;

[0036] Figure 7 It is along Figure 6 A schematic cross-sectional view cut by the section line DD in the diagram;

[0037] Figure 8 yes Figure 7 A schematic enlarged view of part E in the middle.

[0038] In the diagram: 1. Main truss; 11. Upper truss; 12. Lower truss; 13. Diagonal bracing beam; 2. Concrete box girder; 3. Steel box girder; 4. Lifting assembly; 41. Support beam; 42. Steel strand; 43. Hydraulic jack; 5. Connecting assembly; 51. Rear anchor beam; 52. Rear anchor rod; 53. Pad; 54. Nut; 6. Lower pad assembly; 61. Lower pad beam; 62. Lower bamboo plywood pad; 7. Suspension assembly; 71. Fixed beam; 7 2. Support rod; 73. Winch; 74. Wire rope; 741. Screw; 75. First fixed pulley; 8. Pulling part; 81. Pulling rope; 811. Receiving plate; 8111. Threaded cylinder; 82. Guide rod; 83. Second fixed pulley; 9. Clamping part; 91. Driving gear; 92. Driven gear; 93. Rotating rod; 931. Connecting hole; 9311. Magnetic block; 94. Support rod; 941. Iron rod; 95. Branch rope. Detailed Implementation

[0039] This application provides a bridge deck lifting machine for installing steel box girders.

[0040] Example 1:

[0041] See Figure 1 A bridge deck lifting machine for installing steel box girders generally includes: a main truss 1 fixed to a concrete box girder 2 and a lifting assembly 4 for lifting the steel box girder 3. In this embodiment, there are two sets of main trusses 1, and each set has two main trusses 1. The two sets of main trusses 1 are located at both ends of the concrete box girder 2 along the width direction. The main truss 1 consists of an upper truss 11 and a lower truss 12. The upper truss 11 is fixed to the top of the lower truss 12, and the length of the upper truss 11 is greater than that of the lower truss 12. The upper truss 11 is fixed to the concrete box girder 2 by a connecting assembly 5.

[0042] See Figure 1 In addition, a diagonal bracing beam 13 is fixedly installed between the upper truss 11 and the lower truss 12. The diagonal bracing beam 13 is inclined, and the end of the diagonal bracing beam 13 near the lower truss 12 is inclined downward. In this embodiment, the diagonal bracing beam 13 is made of channel steel. The diagonal bracing beam 13 can improve the strength between the upper truss 11 and the lower truss 12, thereby making the overall stress of the main truss 1 more stable and safer.

[0043] See Figure 2The connecting component 5 includes: a rear anchor beam 51, a rear anchor rod 52, a pad 53, and a nut 54. The rear anchor beam 51 is fixed to the top of the upper truss 11 and spans the top of the two sets of main trusses 1. In this embodiment, the rear anchor beam 51 is made of double-section I-beams, and there are two rear anchor beams 51 in this embodiment. One end of the rear anchor rod 52 passes through the rear anchor beam 51, and the other end passes through the concrete box girder 2. In this embodiment, there are twelve rear anchor rods 52 in total, with three corresponding to each end of a single rear anchor beam 51. In this embodiment, the rear anchor rods 52 are made of Φ40 precision-rolled threaded steel.

[0044] See Figure 2 A pad 53 is fitted onto the rear anchor rod 52, and the pad 53 abuts against the inner wall of the rear anchor beam 51 and the concrete box girder 2. A nut 54 is threaded onto the rear anchor rod 52, and the nut 54 abuts against the pad 53. In this embodiment, the nut 54 is a precision-rolled nut 54. The pad 53 can increase the area between the nut 54 and the inner wall of the rear anchor beam 51 and the concrete box girder 2, thereby improving the fixing strength of the rear anchor rod 52 and thus improving the fixing strength of the main truss 1.

[0045] During installation, the rear anchor rod 52 is passed through the rear anchor beam 51 and the concrete box beam 2, then the pad 53 is placed on the rear anchor rod 52, and then the nut 54 is tightened onto the rear anchor rod 52, thereby completing the fixation of the main truss 1.

[0046] See Figure 1 The lifting component 4 includes a support beam 41, steel strands 42, and a hydraulic jack 43. The support beam 41 is fixed to the top of the upper truss 11 and spans across the two main trusses 1. In this embodiment, the support beam 41 is composed of two double-I-beams, which are arranged vertically and perpendicularly to each other. The hydraulic jack 43 is mounted on the top of the support beam 41. In this embodiment, the hydraulic jack 43 is a through-type hydraulic jack. One end of the steel strands 42 is connected to the hydraulic jack 43, and the other end is connected to the top of the steel box girder 3. The top of the steel box girder 3 is provided with corresponding lifting lugs.

[0047] When lifting the steel box girder 3, the hydraulic jack 43 is activated, and then the steel strand 42 is driven to pull the steel box girder 3 upward, thereby lifting the steel box girder 3. Compared with related technologies, using the already installed concrete box girder 2 as the main support, and then using the cooperation of the hydraulic jack 43 and the steel strand 42 to lift and close the steel box girder 3, can reduce the amount of temporary support and the workload of segmental hoisting, thereby improving construction efficiency and achieving the effect of significantly shortening the construction period; and it is less likely to affect the navigation of the waterway.

[0048] See Figure 1Furthermore, a lower pad assembly 6 is fixedly installed at the bottom of the lower truss 12. The lower pad assembly 6 includes a lower pad beam 61, which is fixed to the bottom of the lower truss 12. In this embodiment, the lower pad beam 61 is a steel sleeper beam. The lower pad beam 61 can level the main truss 1, thereby ensuring that the equipment on the main truss 1 is in a horizontal state.

[0049] See Figure 1 The lower pad assembly 6 also includes a lower pad bamboo plywood 62, which is fixed to the bottom of the lower pad beam 61. The lower pad bamboo plywood 62 is less likely to damage the concrete box beam 2.

[0050] The working principle of Example 1 is as follows: When lifting the steel box girder 3, the hydraulic jack 43 is activated, and then the steel strand 42 is driven to pull the steel box girder 3 upward, thereby lifting the steel box girder 3. Compared with related technologies, using the already installed concrete box girder 2 as the main support, and then using the cooperation of the hydraulic jack 43 and the steel strand 42 to lift and close the steel box girder 3, can reduce the amount of temporary support used and the workload of segmental hoisting, thereby improving construction efficiency and achieving the effect of significantly shortening the construction period; and it is less likely to affect the navigation of the waterway.

[0051] Example 2:

[0052] See Figure 3 The difference between this embodiment and the first embodiment is that a suspension assembly 7 is provided between the steel box girder 3 and the upper truss 11, and a stabilizing assembly is provided between the suspension assembly 7 and the rear anchor rod 52 (the rear anchor rod 52 on the side away from the hydraulic jack 43). The suspension assembly 7 and the stabilizing assembly can enhance the strength of the rear anchor rod 52 in supporting and fixing the main truss 1, thereby further improving the stability of the main truss 1.

[0053] See Figure 3 The suspension assembly 7 includes: a fixed beam 71, a support rod 72, a winch 73, a wire rope 74, and a first fixed pulley 75. The fixed beam 71 is fixed to the top of the upper truss 11 and located at the end of the upper truss 11 away from the hydraulic jack 43. In this embodiment, the fixed beam 71 is made of I-beam, and the fixed beam 71 is only horizontally mounted on the top of the two main trusses 1 in a single assembly. The winch 73 is fixedly installed on the top of the fixed beam 71. By using the fixed beam 71, the weight at the end where the main truss 1 connects to the concrete box girder 2 can be increased, thereby improving the stability of the main truss 1.

[0054] See Figure 3The first fixed pulley 75 is fixed to the top of the steel box girder 3, and the support rod 72 is fixed to the upper truss 11 and is set horizontally. One end of the wire rope 74 is wound around the support rod 72 and connected to the winch 73, and the other end is wound around the first fixed pulley 75 and connected to the stabilizing component. During the lifting of the steel box girder 3, the wire rope 74 is also in a taut state. While the steel box girder 3 is being lifted by the hydraulic jack 43 and the steel strand 42, the winch 73 also winds up the wire rope 74, thereby lifting the steel box girder 3 as well. The two are synchronized, which can provide an extra layer of protection for the lifting of the steel box girder 3 for greater safety. In addition, the taut state of the wire rope 74 can tighten the stabilizing component, thereby improving the strength of the rear anchor rod 52 in supporting and fixing the main truss 1, and further improving the stability of the main truss 1.

[0055] See Figure 3 The stabilizing components include: a pulling part 8 and a clamping part 9.

[0056] See Figure 3 and Figure 4 The pulling section 8 includes a pulling rope 81, a guide rod 82, and a second fixed pulley 83. The guide rod 82 is fixed to the upper truss 11 and is horizontally arranged. The end of the wire rope 74 away from the winch 73 is wound around the guide rod 82. The guide rod 82 is mainly used to support the wire rope 74. The second fixed pulley 83 is detachably fixed to the top of the concrete box girder 2 by bolts. The end of the wire rope 74 away from the winch 73 is wound around the second fixed pulley 83. One end of the pulling rope 81 is connected to the rear anchor rod 52, and the other end is connected to the wire rope 74. During the process of hoisting the steel box girder 3 with the wire rope 74, the wire rope 74 is in a taut state to tighten the pulling rope 81. Thus, the pulling rope 81 can have a pulling tendency on the rear anchor rod 52 to the side away from the hydraulic jack 43, so that the rear anchor rod 52 is not easily bent and damaged towards the side closer to the hydraulic jack 43.

[0057] See Figure 4 and Figure 5 The clamping part 9 includes: a driving gear 91, a driven gear 92, a rotating rod 93, a support rod 94, and a branch rope 95. The driven gear 92 is fixed to the nut 54, and the rear anchor rod 52 passes through the driven gear 92. The rotating rod 93 is rotatably mounted on the rear anchor rod 52 and is vertically arranged. One end of the support rod 94 is coaxially connected to the rotating rod 93, and the other end is coaxially fixed to the driving gear 91, and the driving gear 91 meshes with the driven gear 92.

[0058] See Figure 6 , Figure 7 and Figure 8The rotating rod 93 has connecting holes 931 at both ends of its end walls. The connecting holes 931 are square, and a magnetic block 9311 is fixedly installed at the bottom of each hole. An iron rod 941 is welded to one end of the support rod 94 near the rotating rod 93. The iron rod 941 is placed inside the connecting hole 931, and it is magnetically attracted to the magnetic block 9311. During installation, after the rear anchor rod 52 is installed, i.e., the rotating rod 93 is installed, the iron rod 941 on the support rod 94 is inserted into the connecting hole 931. The magnetic block 9311 is magnetically attracted to the iron rod 941, thus completing the connection between the support rod 94 and the rotating rod 93.

[0059] During disassembly, pulling the support rod 94 separates it from the rotating rod 93, allowing the iron rod 941 to be pulled out from the connecting hole 931, thus facilitating the disassembly of the rear anchor rod 52.

[0060] See Figure 3 and Figure 4 One end of the branch rope 95 is wound around the rotating rod 93, and the other end is fixed to the pull rope 81. When the pull rope 81 is in a taut state, the pull rope 81 will also tighten the branch rope 95. Thus, the branch rope 95 always has the tendency to pull the rotating rod 93 clockwise and rotate. Furthermore, through the meshing of the driving gear 91 and the driven gear 92, the nut 54 can be firmly tightened on the rear anchor rod 52 and is not easy to loosen, thereby ensuring the stability of the rear anchor rod 52 and improving the stability of the main truss 1.

[0061] See Figure 4 Furthermore, a receiving plate 811 is fixedly installed at the end of the pull rope 81 away from the rear anchor rod 52, and a threaded cylinder 8111 is rotatably installed on the side of the receiving plate 811 away from the pull rope 81. A screw 741 is fixedly installed at the end of the wire rope 74 away from the winch 73, and the screw 741 is threaded into the threaded cylinder 8111. When it is necessary to disassemble the rear anchor rod 52, the threaded cylinder 8111 can be rotated to remove the screw 741 from the threaded cylinder 8111, so that the pull rope 81 can be separated from the wire rope 74, so as to disassemble the rear anchor rod 52.

[0062] The working principle of Example 2 is as follows: During the process of hoisting the steel box girder 3 with the wire rope 74, the wire rope 74 is in a taut state to tighten the pulling rope 81. As a result, the pulling rope 81 can have a pulling tendency on the rear anchor rod 52 to the side away from the hydraulic jack 43, so that the rear anchor rod 52 is not easy to bend and be damaged to the side closer to the hydraulic jack 43.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bridge deck hoist for installing steel box girders, characterized in that, include: A main truss (1) fixed to a concrete box girder (2) and a lifting assembly (4) for lifting a steel box girder (3). The main truss (1) and the concrete box girder (2) are fixed together by a connecting assembly (5). The lifting assembly (4) includes a support beam (41), a steel strand (42) and a hydraulic jack (43). The support beam (41) is fixed to the top of the main truss (1). The hydraulic jack (43) is mounted on the support beam (41). The steel strand (42) is connected between the hydraulic jack (43) and the steel box girder (3). The connecting assembly (5) includes: a rear anchor beam (51), a rear anchor rod (52), a pad (53), and a nut (54). The rear anchor beam (51) is fixed to the top of the main truss (1). One end of the rear anchor rod (52) passes through the rear anchor beam (51), and the other end passes through the concrete box girder (2). The pad (53) is fitted on the rear anchor rod (52) and abuts against the rear anchor beam (51) and the concrete box girder (2). The nut (54) is threaded on the rear anchor rod (52) and abuts against the pad (53). A suspension assembly (7) is provided between the steel box girder (3) and the main truss (1), and a stabilizing assembly is provided between the suspension assembly (7) and the rear anchor rod (52). The suspension assembly (7) includes: a fixed beam (71), a support rod (72), a winch (73), a wire rope (74), and a first fixed pulley (75). The fixed beam (71) and the support rod (72) are both fixed on the main truss (1). The winch (73) is fixed on the fixed beam (71). The first fixed pulley (75) is fixed on the steel box girder (3). One end of the wire rope (74) is wound around the support rod (72) and connected to the winch (73), and the other end is wound around the first fixed pulley (75) and connected to the stabilizing assembly. The stabilizing component includes a pulling part (8), which includes a pulling rope (81), a guide rod (82), and a second fixed pulley (83). The guide rod (82) is fixed to the main truss (1), and the second fixed pulley (83) is fixed to the concrete box girder (2). The end of the wire rope (74) away from the winch (73) is wound around the guide rod (82) and the second fixed pulley (83). One end of the pulling rope (81) is connected to the rear anchor rod (52), and the other end is connected to the wire rope (74). The stabilizing component further includes a clamping part (9), which includes a driving gear (91), a driven gear (92), a rotating rod (93), a support rod (94), and a branch rope (95). The driven gear (92) is fixed to the nut (54), and the rear anchor rod (52) passes through the driven gear (92). The rotating rod (93) is rotatably mounted on the rear anchor rod (52). One end of the support rod (94) is coaxially connected to the rotating rod (93), and the other end is coaxially fixed to the driving gear (91). The driving gear (91) meshes with the driven gear (92). One end of the branch rope (95) is wound around the rotating rod (93), and the other end is fixedly connected to the pull rope (81).

2. The bridge deck hoist for installing steel box girders according to claim 1, characterized in that, The main truss (1) consists of an upper truss (11) and a lower truss (12), and the upper truss (11) is fixed to the top of the lower truss (12). A diagonal bracing beam (13) is fixed between the upper truss (11) and the lower truss (12).

3. The bridge deck lifting machine for installing steel box girders according to claim 2, characterized in that, The bottom of the lower truss (12) is fixedly provided with a lower pad assembly (6), the lower pad assembly (6) includes: a lower pad beam (61), the lower pad beam (61) is fixed to the bottom of the lower truss (12).

4. The bridge deck lifting machine for installing steel box girders according to claim 3, characterized in that, The lower pad assembly (6) further includes a lower pad bamboo plywood (62), which is fixed to the bottom of the lower pad beam (61) and abuts against the concrete box beam (2).

5. The bridge deck lifting machine for installing steel box girders according to claim 1, characterized in that, A receiving plate (811) is fixedly installed at one end of the pull rope (81) away from the rear anchor rod (52). A threaded cylinder (8111) is rotatably installed on the receiving plate (811). A screw (741) is fixedly installed on the wire rope (74), and the screw (741) is threadedly connected to the threaded cylinder (8111).

6. The bridge deck lifting machine for installing steel box girders according to claim 1, characterized in that, The rotating rod (93) has a connecting hole (931) on its end wall, and a magnetic block (9311) is fixedly installed at the bottom of the connecting hole (931). The support rod (94) has an iron rod (941) fixedly installed on its end wall. The iron rod (941) is installed in the connecting hole (931), and the iron rod (941) and the magnetic block (9311) are magnetically attracted to each other.

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