Temporary support prefabricated foundation for steel box girder

Abstract

The application relates to a steel box girder temporary support prefabricated foundation and belongs to the technical field of building engineering. The support prefabricated foundation comprises a stand column and a cross beam, two stand columns are oppositely arranged, and the two ends of the cross beam are fixedly connected to the two stand columns; support plates are slidably connected to the two ends of the cross beam along the height direction of the cross beam, a bidirectional screw rod is rotationally connected in the cross beam, the two ends of the bidirectional screw rod are threadedly connected with sliding blocks, and linkage rods are hinged between the support plates and the sliding blocks; and a power assembly for driving the bidirectional screw rod to rotate is arranged in the cross beam. The power assembly drives the bidirectional screw rod to rotate, the two sliding blocks on the bidirectional screw rod are close to or far away from each other, the support plates are lifted or lowered through the linkage rods, the steel box girder to be installed is placed on the adjusted support plates, the height of the steel box girder to be installed can be aligned with that of other installed steel box girders, and therefore the installation efficiency of the steel box girder can be improved.

Description

Technical Field

[0001] This application relates to the field of building engineering technology, and in particular to a prefabricated foundation for temporary support of steel box girders. Background Technology

[0002] Steel box girders are a common structural form for long-span bridges. On bridges with long spans, steel box girders can span hundreds or even thousands of meters. Usually, temporary support frames need to be erected before the steel box girder is installed. The steel box girder is placed on the temporary support frames for installation. After the steel box girder is installed, the temporary support frames are removed.

[0003] However, due to uneven ground or different heights of the steel box girders, using the aforementioned temporary support frame to support the steel box girders will cause the steel box girders to be misaligned with the already installed steel box girders, which will affect the installation efficiency of the steel box girders. Summary of the Invention

[0004] In order to effectively improve the installation efficiency of steel box girders, this application provides a prefabricated foundation for temporary support of steel box girders.

[0005] The purpose of this application is to provide a precast foundation for temporary support of steel box girders, which adopts the following technical solution: A prefabricated foundation for temporary support of a steel box girder includes columns and a crossbeam. Two columns are arranged opposite each other, and both ends of the crossbeam are fixedly connected to the two columns. Support plates are slidably connected to both ends of the crossbeam along its height direction. A bidirectional screw rod is rotatably connected inside the crossbeam, and sliding blocks are threaded to both ends of the bidirectional screw rod. A linkage rod is hinged between the support plate and the sliding block. A power assembly for driving the bidirectional screw rod to rotate is provided inside the crossbeam.

[0006] By adopting the above technical solution, the power component drives the bidirectional lead screw to rotate, which facilitates the two sliding blocks on the bidirectional lead screw to move closer or further apart. Then, through the linkage rod, the support plate is raised or lowered, and the steel box girder to be installed is placed on the adjusted support plate. This allows the height of the steel box girder to be installed to be aligned with other installed steel box girders, thus improving the installation efficiency of the steel box girder.

[0007] Optionally, the power assembly includes a worm gear, a worm, and a power motor. The power motor is fixedly connected to the crossbeam, and the worm is fixedly connected to the output shaft of the power motor. A rotating rod is fixedly connected between the two bidirectional lead screws, and the worm gear is fixedly connected to the rotating rod, and the worm gear meshes with the worm.

[0008] By adopting the above technical solution, starting the power motor causes the worm to rotate, and the rotation of the worm will drive the worm wheel to rotate, which facilitates the rotation of the rotating rod and the bidirectional lead screw, thus making the height adjustment of the support plate more convenient; at the same time, the worm wheel and worm have a self-locking function, which can reduce the situation of the support plate moving up and down automatically.

[0009] Optionally, a support rod is fixedly connected to the support plate, and locking grooves are spaced apart along the height direction of the support rod; a recessed groove is provided on the side of the crossbeam, and a locking rod that is slidably connected in the recessed groove and inserted into the locking groove; a locking spring is sleeved on the locking rod, one end of the locking spring is fixedly connected to the surface of the locking rod, and the other end of the locking spring is fixedly connected to the groove wall of the recessed groove; the end face of the locking rod is an inclined surface facing the column direction.

[0010] By adopting the above technical solution, the locking groove and locking rod work together to fix the support rod on the crossbeam, which facilitates the transfer of the weight of the steel box girder on the support plate to the crossbeam and column through the support rod, thereby reducing the possibility of damage to the linkage rod and double-acting screw. When the power component drives the support plate to move upward, the inclined surface of the locking rod will press against the groove wall of the recessed groove so that the locking rod retracts into the recessed groove. When the locking rod is aligned with the new locking groove, the end of the locking rod will be inserted into the new locking groove, thereby achieving the purpose of adjusting the height of the support plate.

[0011] Optionally, the crossbeam has an unlocking hole, an unlocking block is slidably connected in the unlocking hole, and a first pull rope is fixedly connected between the unlocking block and the locking rod; the side of the crossbeam has a toggle groove communicating with the unlocking hole, and a toggle block connected to the unlocking block is slidably connected in the toggle groove.

[0012] By adopting the above technical solution, the unlocking block is moved within the unlocking hole by the toggle block, which facilitates the pulling of the locking rod by the first pull rope. This causes the end of the locking rod to retract into the recessed groove, allowing the support plate to move downwards to fit against the upper surface of the crossbeam. This makes the transport of the crossbeam and column more convenient.

[0013] Optionally, a connecting column is fixedly connected to the top of the column, a connecting groove is provided on the crossbeam to engage with the connecting column, and a limiting component is provided on the crossbeam to restrict the connecting column within the connecting groove.

[0014] By adopting the above technical solution, the crossbeam can be more stably installed on the two columns by using the connecting column and the connecting groove; and by using the limiting component to restrict the connecting column in the connecting groove, the connection strength between the crossbeam and the column can be further improved.

[0015] Optionally, the limiting component includes a threaded rod, and the crossbeam has a threaded hole that communicates with the connecting groove, the threaded hole being threadedly engaged with the threaded rod.

[0016] By adopting the above technical solution, the threaded rod is screwed in so that the end of the threaded rod presses against the side of the connecting column, thereby confining the connecting column within the connecting groove, resulting in a simple structure.

[0017] Optionally, the bottom of the connecting groove is provided with a communicating hole that communicates with the unlocking hole. An auxiliary rod is slidably connected in the communicating hole, and a second pull rope is fixedly connected between the auxiliary rod and the unlocking block. An unlocking spring is provided in the communicating hole. One end of the unlocking spring is fixedly connected to the auxiliary rod, and the other end of the unlocking spring is fixedly connected to the wall of the communicating hole. The elastic coefficient of the unlocking spring is greater than that of the locking spring. When the unlocking spring is in its natural state, one end of the auxiliary rod is located in the connecting groove, and the end of the locking rod is located in the recessed groove.

[0018] By adopting the above technical solution, after the crossbeam is removed from the column, one end of the auxiliary rod will be inserted into the connecting groove under the action of the unlocking spring. The movement of the auxiliary rod will pull the unlocking block and the locking rod to move, so that the end of the locking rod retracts into the recessed groove, which facilitates driving the support plate to move downward to fit against the upper surface of the crossbeam.

[0019] Optionally, the support plate has several through-holes, and a positioning rod is slidably connected in the mounting holes; a positioning spring is sleeved on the positioning rod, one end of the positioning spring is fixedly connected to the lower surface of the support plate, and the other end of the positioning spring is fixedly connected to the positioning rod.

[0020] By adopting the above technical solution, when the steel box girder is placed on two support plates, some of the positioning rods will be inserted into the grooves or through holes on the surface of the steel box girder under the action of the positioning spring. The use of these positioning rods can reduce the horizontal movement of the steel box girder on the support plates, thereby making the support plates provide better support for the steel box girder.

[0021] Optionally, an anti-slip pad is fixedly connected to the top of the positioning rod.

[0022] By adopting the above technical solution, the positioning spring can press the anti-slip pad against the surface of the steel box girder. The anti-slip pad can reduce the horizontal movement of the steel box girder on the support plate, thereby making the support plate provide better support for the steel box girder. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of a prefabricated foundation for temporary support of a steel box girder in an embodiment of this application; Figure 2 yes Figure 1 Enlarged view of section A; Figure 3 yes Figure 1 Enlarged view of section B; Figure 4 This is a partial structural cross-sectional view of an embodiment of this application, mainly used to show the connection diagram of the support rod and the guide cylinder; Figure 5 This is a partial structural cross-sectional view of an embodiment of this application, mainly used to show the connection diagram of the column and the beam; Figure 6 This is a partial connection diagram of an embodiment of this application, mainly used to show the connection diagram of the support plate and the positioning rod.

[0024] Explanation of reference numerals in the attached drawings: 1. Column; 2. Crossbeam; 3. Support plate; 4. Two-way lead screw; 5. Sliding block; 6. Linkage rod; 7. Power assembly; 71. Worm gear; 72. Worm; 73. Power motor; 8. Rotating rod; 9. Support rod; 10. Locking groove; 11. Recessed groove; 12. Locking rod; 13. Locking spring; 14. Unlocking hole; 15. Unlocking block; 16. First pull rope; 17. Actuating groove; 18. Actuating block; 19. Connecting column; 20. Connecting groove; 21. Restriction assembly; 211. Threaded rod; 212. Threaded hole; 22. Connecting hole; 23. Auxiliary rod; 24. Second pull rope; 25. Unlocking spring; 26. Mounting hole; 27. Positioning rod; 28. Positioning spring; 29. ​​Anti-slip pad; 30. Guide cylinder; 31. Linkage frame; 32. Linkage cylinder; 33. Receiving groove. Detailed Implementation

[0025] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1-6 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0026] This application discloses a prefabricated foundation for temporary support of a steel box girder. (Refer to...) Figure 1 The precast foundation includes columns 1 and beams 2. Two columns 1 are installed opposite each other, and the two ends of the beams 2 are fixedly connected to the tops of the two columns 1. Support plates 3 are slidably connected to both ends of the beams 2 along the height direction of the beams 2, and the support plates 3 are located above the beams 2. The steel box girder is supported by the support plates 3 at both ends of the beams 2.

[0027] Reference Figure 1 and Figure 2To better adjust the height of the steel box girder, a double-acting screw 4 is rotatably connected inside the crossbeam 2. Both ends of the double-acting screw 4 are threaded with sliding blocks 5. A linkage rod 6 is hinged between the support plate 3 and the sliding blocks 5. The double-acting screw 4 is located below the support plate 3. Rotating the double-acting screw 4 causes the two sliding blocks 5 to move closer or further apart, allowing the support plate 3 to move closer or further away from the upper surface of the crossbeam 2, thus achieving height adjustment of the steel box girder.

[0028] Reference Figure 1 and Figure 2 To better drive the support plate 3 to move up and down, a power assembly 7 that drives the bidirectional lead screw 4 to rotate is installed inside the crossbeam 2. The power assembly 7 includes a worm gear 71, a worm 72 and a power motor 73. The housing of the power motor 73 is fixedly connected to the crossbeam 2, and the worm 72 is fixedly connected to the output shaft of the power motor 73. A rotating rod 8 is fixedly connected between the two bidirectional lead screws 4 by a key connection. The worm gear 71 is fixedly connected to the rotating rod 8 by a key connection, and the worm gear 71 meshes with the worm 72.

[0029] In this embodiment, the worm 72 is rotated by starting the power motor 73. The rotation of the worm 72 will drive the worm wheel 71 to rotate, which will facilitate the rotation of the rotating rod 8 and the bidirectional lead screw 4, thereby making the height adjustment of the support plate 3 more convenient. At the same time, the worm wheel 71 and the worm 72 have a self-locking function, which can reduce the situation of the support plate 3 moving up and down automatically.

[0030] Reference Figure 1 and Figure 3 To improve the stability of the support plate 3 in supporting the steel box girder, four support rods 9 are welded to the lower surface of the support plate 3. These four support rods 9 are located at the four corners of the support plate 3. Locking grooves 10 are spaced apart along the height of each support rod 9. Eight guide cylinders 30 are welded to the sides of the crossbeam 2, with four guide cylinders corresponding to each support plate 3. The guide cylinders 30 are slidably fitted onto the support rods 9. The cooperation between the support rods 9 and the guide cylinders 30 guides the vertical movement of the support plate 3.

[0031] Reference Figure 3 and Figure 4 To improve the stability of the support plate 3 in supporting the steel box girder, a recessed groove 11 is provided on the inner wall of the guide cylinder 30. A locking rod 12 is slidably connected in the recessed groove 11, and the locking rod 12 is inserted into the locking groove 10. A locking spring 13 is sleeved on the locking rod 12. One end of the locking spring 13 is fixedly connected to the surface of the locking rod 12, and the other end of the locking spring 13 is fixedly connected to the groove wall of the recessed groove 11. The end face of the locking rod 12 is an inclined surface facing the column 1.

[0032] In this embodiment, by cooperating with the locking groove 10 and the locking rod 12, the support rod 9 can be fixed on the guide cylinder 30, which facilitates the transfer of the weight of the steel box girder on the support plate 3 to the crossbeam 2 and the column 1 through the support rod 9, thereby reducing the possibility of damage to the linkage rod 6 and the double-acting screw 4. During the process of the power motor 73 driving the support plate 3 to move upward, the inclined surface of the locking rod 12 will press against the groove wall of the recessed groove 11 so that the locking rod 12 retracts into the recessed groove 11. When the locking rod 12 is aligned with the new locking groove 10, the end of the locking rod 12 will be inserted into the new locking groove 10, thereby achieving the purpose of adjusting the height of the support plate 3.

[0033] Reference Figure 3 and Figure 5 To facilitate the handling of the crossbeam 2, an unlocking hole 14 is provided inside the crossbeam 2. An unlocking block 15 is slidably connected inside the unlocking hole 14, and a first pull rope 16 is fixedly connected between the unlocking block 15 and the locking rod 12; that is, one end of the first pull rope 16 is fixedly connected to the unlocking block 15, and the other end of the first pull rope 16 is fixedly connected to the locking rod 12. A toggle groove 17 is provided on the side of the crossbeam 2, which communicates with the unlocking hole 14. A toggle block 18 is slidably connected inside the toggle groove 17, and the toggle block 18 is fixedly connected to the side of the unlocking block 15. By using the toggle block 18, the unlocking block 15 can move within the unlocking hole 14, facilitating the pulling of the locking rod 12 via the first pull rope 16. This causes the end of the locking rod 12 to retract into the recessed groove 11, allowing the support plate 3 to move downwards to fit against the upper surface of the crossbeam 2, thus making the handling of the crossbeam 2 and the column 1 more convenient.

[0034] Reference Figure 3 and Figure 5 To enable simultaneous unlocking of the four locking levers 12 corresponding to the same support plate 3, a linkage frame 31 is slidably sleeved on the outer side of the crossbeam 2. The inner wall of the linkage frame 31 is fixedly connected to the ends of the four actuating blocks 18. A linkage cylinder 32 is installed on the side of the crossbeam 2. The outer shell of the linkage cylinder 32 is fixed to the crossbeam 2 with screws, and the piston rod of the linkage cylinder 32 is fixedly connected to the linkage frame 31. By activating the linkage cylinder 32, the linkage frame 31 moves up and down, thereby causing the four actuating blocks 18 on the linkage frame 31 to move up and down, thus retracting the ends of the four locking levers 12 corresponding to the same support plate 3 into the recessed groove 11.

[0035] Reference Figure 3 and Figure 5To enhance the connection strength between the crossbeam 2 and the column 1, four connecting posts 19 are integrally formed at the top of the column 1, and four connecting slots 20 are formed on the lower surface of the crossbeam 2. The connecting slots 20 are inserted into the connecting posts 19. A limiting component 21 is installed on the crossbeam 2 to confine the connecting posts 19 within the connecting slots 20. The limiting component 21 includes a threaded rod 211, and a threaded hole 212 is formed on the side of the crossbeam 2. The threaded hole 212 communicates with the connecting slot 20, and the threaded hole 212 is threaded into the threaded rod 211. The cooperation between the connecting posts 19 and the connecting slots 20 makes the crossbeam 2 more stable when mounted on the two columns 1. Furthermore, by screwing in the threaded rod 211, the end of the threaded rod 211 presses against the side of the connecting post 19, thereby confining the connecting post 19 within the connecting slots 20 and further enhancing the connection strength between the crossbeam 2 and the column 1.

[0036] Reference Figure 3 and Figure 5 To drive the support plate 3 downward to fit against the upper surface of the crossbeam 2, a connecting hole 22 is provided at the bottom of the connecting groove 20, which is connected to the unlocking hole 14. An auxiliary rod 23 is slidably connected in the connecting hole 22, and a second pull rope 24 is fixedly connected between the auxiliary rod 23 and the unlocking block 15. An unlocking spring 25 is installed in the connecting hole 22, with one end of the unlocking spring 25 fixedly connected to the auxiliary rod 23 and the other end fixedly connected to the hole wall of the connecting hole 22. The elastic coefficient of the unlocking spring 25 is greater than that of the locking spring 13. When the unlocking spring 25 is in its natural state, one end of the auxiliary rod 23 is located in the connecting groove 20, and the end of the locking rod 12 is located in the recessed groove 11.

[0037] In this embodiment, after the crossbeam 2 is removed from the column 1, one end of the auxiliary rod 23 will be inserted into the connecting groove 20 under the action of the unlocking spring 25. The movement of the auxiliary rod 23 will pull the unlocking block 15 and the locking rod 12 to move, so that the end of the locking rod 12 is retracted into the recessed groove 11, which facilitates driving the support plate 3 to move downward to fit against the upper surface of the crossbeam 2.

[0038] Reference Figure 5 and Figure 6 The support plate 3 has several mounting holes 26 through which a positioning rod 27 is slidably connected. A positioning spring 28 is sleeved on the positioning rod 27, with one end of the positioning spring 28 fixedly connected to the lower surface of the support plate 3 and the other end fixedly connected to the positioning rod 27. When the steel box girder is placed on the two support plates 3, part of the positioning rod 27 will be inserted into the groove or through hole on the surface of the steel box girder under the action of the positioning spring 28. This part of the positioning rod 27 can reduce the horizontal movement of the steel box girder on the support plate 3, thereby making the support plate 3 provide better support for the steel box girder.

[0039] Reference Figure 5 and Figure 6 The top of the positioning rod 27 is a square block, and the upper surface of the support plate 3 has a receiving groove 33. The receiving groove 33 is inserted into the square block of the positioning rod 27, that is, the square block of the positioning rod 27 can be accommodated in the receiving groove 33. An anti-slip pad 29 is fixedly connected to the square block of the positioning rod 27 with strong adhesive. The positioning spring 28 can press the anti-slip pad 29 against the surface of the steel box girder. The anti-slip pad 29 can reduce the horizontal movement of the steel box girder on the support plate 3, thereby making the support plate 3 provide better support for the steel box girder.

[0040] The implementation principle of the temporary support prefabricated foundation for steel box girder in this application embodiment is as follows: the double-sided lead screw 4 is rotated by the power motor 73, which facilitates the two sliding blocks 5 on the double-sided lead screw 4 to move closer or further apart. Then, the support plate 3 is raised or lowered by the linkage rod 6, and the steel box girder to be installed is placed on the adjusted support plate 3. This allows the height of the steel box girder to be installed to be aligned with that of other installed steel box girders, thereby improving the installation efficiency of the steel box girder.

[0041] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar alternative features unless specifically stated otherwise. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated foundation for temporary support of a steel box girder, characterized in that, The system includes columns (1) and beams (2). Two columns (1) are arranged opposite each other, and both ends of the beams (2) are fixedly connected to the two columns (1). Support plates (3) are slidably connected to both ends of the beams (2) along the height direction of the beams (2). A double-acting screw (4) is rotatably connected inside the beams (2). Sliding blocks (5) are threaded to both ends of the double-acting screw (4). A linkage rod (6) is hinged between the support plates (3) and the sliding blocks (5). A power assembly (7) for driving the double-acting screw (4) to rotate is provided inside the beams (2). A support rod (9) is fixedly connected to the upper part of the crossbeam (2). Locking grooves (10) are spaced apart along the height direction of the support rod (9). Guide cylinders (30) are fixedly connected to the side of the crossbeam (2) by welding. There are eight guide cylinders (30), and each support plate (3) corresponds to four guide cylinders (30). The guide cylinders (30) are slidably sleeved on the outside of the support rod (9). A recessed groove (11) is opened on the inner wall of the guide cylinder (30). A locking rod (12) that is inserted into the locking groove (10) is slidably connected in the recessed groove (11). A locking spring (13) is sleeved on the locking rod (12). One end of the spring (13) is fixedly connected to the surface of the locking rod (12), and the other end of the locking spring (13) is fixedly connected to the groove wall of the recessed groove (11); the end face of the locking rod (12) is an inclined surface facing the column (1); during the process of the power component (7) driving the support plate (3) to move upward, the inclined surface of the locking rod (12) will press against the groove wall of the recessed groove (11) so that the locking rod (12) retracts into the recessed groove (11). When the locking rod (12) is aligned with the new locking groove (10), the end of the locking rod (12) will be inserted into the new locking groove (10) to achieve the purpose of adjusting the height of the support plate (3); The crossbeam (2) has an unlocking hole (14) inside, and an unlocking block (15) is slidably connected inside the unlocking hole (14). A first pull rope (16) is fixedly connected between the unlocking block (15) and the locking rod (12). The side of the crossbeam (2) has a toggle groove (17) that communicates with the unlocking hole (14). A toggle block (18) connected to the unlocking block (15) is slidably connected inside the toggle groove (17). A linkage frame (31) is slidably sleeved on the outside of the crossbeam (2). The inner wall of the linkage frame (31) is fixedly connected to the ends of the four toggle blocks (18). A linkage cylinder (32) is installed on the side of the crossbeam (2). The outer shell of the linkage cylinder (32) is fixed to the crossbeam (2) with screws. The piston rod of the linkage cylinder (32) is fixedly connected to the linkage frame (31).

2. The prefabricated foundation for temporary support of a steel box girder according to claim 1, characterized in that, The power assembly (7) includes a worm gear (71), a worm (72) and a power motor (73). The power motor (73) is fixedly connected to the crossbeam (2), and the worm (72) is fixedly connected to the output shaft of the power motor (73). A rotating rod (8) is fixedly connected between the two bidirectional lead screws (4). The worm gear (71) is fixedly connected to the rotating rod (8), and the worm gear (71) meshes with the worm (72).

3. The prefabricated foundation for temporary support of a steel box girder according to claim 1, characterized in that, The top of the column (1) is fixedly connected to a connecting column (19), and the crossbeam (2) is provided with a connecting groove (20) that is inserted into the connecting column (19). The crossbeam (2) is provided with a limiting component (21) for limiting the connecting column (19) within the connecting groove (20).

4. The prefabricated foundation for temporary support of a steel box girder according to claim 3, characterized in that, The limiting component (21) includes a threaded rod (211), and the crossbeam (2) has a threaded hole (212) that communicates with the connecting groove (20), and the threaded hole (212) is threadedly engaged with the threaded rod (211).

5. A prefabricated foundation for temporary support of a steel box girder according to claim 4, characterized in that, The bottom of the connecting groove (20) is provided with a connecting hole (22) that communicates with the unlocking hole (14). An auxiliary rod (23) is slidably connected in the connecting hole (22). A second pull rope (24) is fixedly connected between the auxiliary rod (23) and the unlocking block (15). An unlocking spring (25) is provided in the connecting hole (22). One end of the unlocking spring (25) is fixedly connected to the auxiliary rod (23), and the other end of the unlocking spring (25) is fixedly connected to the wall of the connecting hole (22). The elastic coefficient of the unlocking spring (25) is greater than that of the locking spring (13). When the unlocking spring (25) is in its natural state, one end of the auxiliary rod (23) is located in the connecting groove (20), and the end of the locking rod (12) is located in the recessed groove (11).

6. The prefabricated foundation for temporary support of a steel box girder according to claim 1, characterized in that, The support plate (3) has several mounting holes (26) through it. A positioning rod (27) is slidably connected in the mounting holes (26). A positioning spring (28) is sleeved on the positioning rod (27). One end of the positioning spring (28) is fixedly connected to the lower surface of the support plate (3), and the other end of the positioning spring (28) is fixedly connected to the positioning rod (27).

7. A prefabricated foundation for temporary support of a steel box girder according to claim 6, characterized in that, The top end of the positioning rod (27) is fixedly connected to an anti-slip pad (29).

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