CN114541276A

CN114541276A - Construction device for installing highway variable cross-section steel box girder by dragging sliding support

Info

Publication number: CN114541276A
Application number: CN202210182742.5A
Authority: CN
Inventors: 刘宗族; 廖星星; 黄士宾; 周伟明; 严来章; 王亚坤; 王伟
Original assignee: China Railway 24th Bureau Group Co Ltd
Current assignee: China Railway 24th Bureau Group Co Ltd
Priority date: 2022-02-26
Filing date: 2022-02-26
Publication date: 2022-05-27
Anticipated expiration: 2042-02-26
Also published as: CN114541276B

Abstract

The application relates to the field of steel box girder construction, in particular to a variable cross-section steel box girder construction device of a dragging sliding support mounting highway, which comprises a sliding bearing frame for supporting a steel box girder and a driving part for pushing the sliding bearing frame to move, wherein the sliding bearing frame can slide along the erection direction of the steel box girder, and the driving part comprises a bottom plate fixedly arranged on the ground, a motor arranged on the bottom plate, a mounting plate fixedly connected to the bottom plate, a first threaded cylinder rotatably arranged on the mounting plate, a first screw rod with threads penetrating through the first threaded cylinder and a push plate fixedly connected to the first screw rod; the motor is connected with the first threaded cylinder, a first limiting rod is fixedly connected to the push plate, the first limiting rod penetrates through the first threaded cylinder, and the push plate is in contact with the sliding bearing frame. The application improves the problem that the construction cost of the steel box girder is higher.

Description

Construction device for installing highway variable cross-section steel box girder by dragging sliding support

Technical Field

The application relates to the field of steel box girder construction, in particular to a variable cross-section steel box girder construction device for a dragging and sliding support mounting highway.

Background

At present, steel box girders, also called steel plate box girders, are common structural forms of large-span bridges, are generally used on bridges with larger span, and along with rapid urban development and improvement of economic level, the application of the steel box girder bridges in municipal road reconstruction or new construction is more and more extensive, and because of the advantages of the steel box girder bridges, the steel box girder bridges are often used for crossing buildings such as railways, highways, houses, dams and the like.

In the related technology, the erection method of the variable cross-section steel box girder is that firstly, a bottom layer girder surface is erected on the ground, then, a steel pipe pile is erected at the top of the bottom layer girder surface, a Bailey girder is erected on the steel pipe pile, a distribution girder is erected on the Bailey girder, a slideway is erected on the distribution girder, a segment support frame is erected on the slideway, and finally, the steel box girder is erected on the segment support frame to move.

For the related art described above: when the variable cross-section steel box girder is erected, steel members such as steel pipe piles and Bailey girders need to be dismantled and installed for many times, and the steel members such as the steel pipe piles and the Bailey girders are long in installation and dismantling period, so that the construction cost of the steel box girder is high.

Disclosure of Invention

In order to improve the higher problem of steel box girder construction cost, this application provides the variable cross section steel box girder construction equipment of support installation highway that drags.

The application provides a dragging bracket installation highway variable cross section steel box girder construction equipment that slides adopts following technical scheme:

the construction device comprises a sliding bearing frame for supporting a steel box girder and a driving part for pushing the sliding bearing frame to move, wherein the sliding bearing frame can slide along the erection direction of the steel box girder, and the driving part comprises a bottom plate fixedly arranged on the ground, a motor arranged on the bottom plate, a mounting plate fixedly connected to the bottom plate, a first threaded cylinder rotatably arranged on the mounting plate, a first screw rod with threads penetrating through the first threaded cylinder and a push plate fixedly connected to the first screw rod; the motor is connected with the first threaded barrel, a first limiting rod is fixedly connected to the push plate, the first limiting rod penetrates through the first threaded barrel, and the push plate is in contact with the sliding bearing frame.

Through adopting above-mentioned technical scheme, when needs erect the steel case roof beam, only need the starter motor, the motor drives a screw thread section of thick bamboo and rotates, and a screw thread section of thick bamboo drives first screw rod and removes, and first screw rod drives the push pedal and removes, and the push pedal promotes the bearing frame that slides and slides, and the bearing frame that slides drives the steel case roof beam and removes, can reduce the time of dismantling and installing to the higher problem of steel case roof beam construction cost has been improved.

Preferably, the push plate is provided with a propping part for extruding the sliding bearing frame, and the propping part comprises a connecting plate fixedly connected to the push plate, a second threaded cylinder rotatably mounted on the connecting plate, a second screw rod with threads penetrating through the second threaded cylinder and a propping plate fixedly connected to the second screw rod; the tight plate is fixedly connected with a second limiting rod, the second limiting rod penetrates through the second threaded cylinder, and the tight plate is in contact with the sliding bearing frame.

Through adopting above-mentioned technical scheme, rotate a second screw thread section of thick bamboo, a second screw thread section of thick bamboo drives the second screw rod and removes, and the second screw rod drives and supports tight board and remove, supports tight board and extrudees the bearing frame that slides, can carry on spacingly to the bearing frame that slides, has reduced the emergence that the bearing frame that slides rocked the condition.

Preferably, the motor is slidably mounted on the bottom plate, a square block is fixedly connected to an output shaft of the motor, a square groove for inserting the square block is formed in the end face of the first threaded cylinder, a transmission part is mounted on the connecting plate, and the motor can drive the second threaded cylinder to rotate through the transmission part.

Through adopting above-mentioned technical scheme, remove the motor, the motor passes through the drive disk assembly drive second screw thread section of thick bamboo and rotates, has reduced the time that the staff operated second screw thread section of thick bamboo and has spent, has improved staff's work efficiency.

Preferably, the transmission part comprises a bearing plate fixedly connected to the connecting plate and a telescopic rod rotatably mounted on the bearing plate; one end of the telescopic rod, far away from the bearing plate, is rotatably connected with the mounting plate, a first bevel gear is fixedly arranged on the second threaded cylinder, and a second bevel gear meshed with the first bevel gear is fixedly arranged on the telescopic rod; and a third bevel gear is fixedly arranged on an output shaft of the motor, and a fourth bevel gear which can be meshed with the third bevel gear is fixedly arranged on the telescopic rod.

Through adopting above-mentioned technical scheme, at the in-process that the motor removed, the motor drives third bevel gear and removes, when third bevel gear and fourth bevel gear meshing, third bevel gear drives fourth bevel gear and rotates, fourth bevel gear drives the telescopic link and rotates, the telescopic link drives second bevel gear and rotates, second bevel gear drives first bevel gear and rotates, first bevel gear drives the second threaded cylinder and rotates, can realize spacing the bearing frame that slides.

Preferably, the bottom fixedly connected with dovetail block of motor, the dovetail groove that supplies dovetail block to place is seted up at the top of bottom plate, install on the bottom plate and be used for controlling the dovetail block and carry out the control unit who removes.

Through adopting above-mentioned technical scheme, start control unit, control unit drives the dovetail piece and removes, and the dovetail piece can drive the motor and remove, and the motion trail of motor has been restricted to the dovetail piece, has improved the stability that the motor removed.

Preferably, the control part comprises an electromagnet fixedly connected to the inner wall of the dovetail groove, an iron sheet fixedly connected to the dovetail block and a storage battery fixedly connected to the bottom plate; the electric iron is matched with the iron sheet for use, the storage battery is electrically connected with the electric iron through a lead, a control spring is fixedly connected to the inner wall of the dovetail groove, the control spring is fixedly connected with the dovetail block, and a switch component used for controlling the storage battery to electrify the electric iron is installed on the push plate.

Through adopting above-mentioned technical scheme, promote the in-process that the bearing frame removed that slides at the push pedal, when the bearing frame that slides stopped moving, switching part control battery switched on the electro-magnet this moment, and the electro-magnet carries out the actuation to the iron sheet, and the iron sheet drives the dovetail piece and removes, can realize the removal to the motor, further improvement staff's work efficiency.

Preferably, the side wall of the push plate facing the sliding bearing frame is provided with a mounting groove, the switch part comprises a switch spring fixedly connected to the inner wall of the mounting groove and a switch block placed in the mounting groove in a sliding manner, the switch block is fixedly connected with the switch spring, and the switch block is in contact with the sliding bearing frame; the switch block is provided with a first contact which is electrically connected with the electromagnet through a lead; a second contact matched with the first contact for use is arranged on the inner wall of the mounting groove, and the second contact is electrically connected with the storage battery through a lead; and the switch block is provided with a separation component for separating the first contact from the second contact.

Through adopting above-mentioned technical scheme, at the in-process that the push pedal removed, the push pedal drove the switch piece and removes, and when the bearing frame that slides stopped to remove, the push pedal continued to move, and the relative push pedal of switch piece removes, and when first contact and second contact, the battery can be switched on to the electro-magnet to realized the removal to the motor, reduced staff's operating procedure.

Preferably, a placing groove is formed in the side wall of the switch block, the separating part comprises a separating spring fixedly connected to the side wall of the placing groove and a separating block slidably placed in the placing groove, the separating spring is fixedly connected with the separating block, the first contact is arranged on the separating block, a separating rod is arranged on the side wall of the pushing plate in a penetrating mode, the separating rod can be arranged in the placing groove in a penetrating mode, an inclined surface is formed in the side wall of the separating block, and the separating rod can be in contact with the inclined surface.

Through adopting above-mentioned technical scheme, when needs are withdrawed the push pedal, at first with the motor reversal, the motor drives and supports tight board and move towards one side of keeping away from the bearing frame that slides, then remove the release lever, the release lever promotes the separation piece and removes, separation spring is the compression form this moment, when first contact and second contact separation, control spring drives the dovetail piece and removes for square piece inserts in square groove, the motor drives the push pedal and withdraws, be convenient for promote the bearing frame that slides next time.

In summary, the present application includes at least the following advantageous technical effects:

1. by arranging the sliding bearing frame and the driving part, when the steel box girder needs to be erected, only the motor needs to be started, the motor drives the first threaded cylinder to rotate, the first threaded cylinder drives the first screw rod to move, the first screw rod drives the push plate to move, the push plate pushes the sliding bearing frame to slide, and the sliding bearing frame drives the steel box girder to move, so that the time for dismounting and mounting can be shortened, and the problem of high construction cost of the steel box girder is solved;

2. according to the sliding bearing frame, the abutting part is arranged, the second threaded cylinder rotates, the second threaded cylinder drives the second screw rod to move, the second screw rod drives the abutting plate to move, the abutting plate extrudes the sliding bearing frame, the sliding bearing frame can be limited, and the shaking condition of the sliding bearing frame is reduced;

3. this application is through setting up drive disk assembly, removes the motor, and the motor rotates through drive disk assembly drive second screw thread section of thick bamboo, has reduced the time that the staff operated second screw thread section of thick bamboo and has spent, has improved staff's work efficiency.

Drawings

Fig. 1 is a schematic overall structure diagram of a construction device for installing a highway variable cross-section steel box girder by using a dragging and sliding support according to an embodiment of the application.

Fig. 2 is a schematic structural view of a skid-bearing frame according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a driving part according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of the fastening member according to the embodiment of the present application.

Fig. 5 is a schematic structural diagram of a control unit according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a switch component according to an embodiment of the present application.

Fig. 7 is a schematic structural view of a separating member according to an embodiment of the present application.

Description of reference numerals: 1. a sliding bearing frame; 11. a bottom frame; 111. a pulley; 12. a support pillar; 13. a top frame; 2. a drive member; 21. a base plate; 211. a dovetail groove; 22. a motor; 221. a square block; 222. a dovetail block; 23. mounting a plate; 24. a first threaded barrel; 241. a square groove; 25. a first screw; 26. pushing the plate; 261. mounting grooves; 27. a first limit rod; 3. a tightening member; 31. a connecting plate; 32. a second threaded barrel; 33. a second screw; 34. a propping plate; 35. a second limiting rod; 4. a transmission member; 41. a bearing plate; 42. a telescopic rod; 43. a first bevel gear; 44. a second bevel gear; 45. a third bevel gear; 46. a fourth bevel gear; 5. a control component; 51. an electromagnet; 52. iron sheets; 53. a storage battery; 54. a control spring; 6. a switch member; 61. a switch spring; 62. a switch block; 621. a placement groove; 63. a first contact; 64. a second contact; 7. a separating member; 71. a separation spring; 72. separating the blocks; 721. a bevel; 73. a separating lever; 8. a slide rail.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses construction equipment for installing a highway variable-section steel box girder by dragging a sliding support. Referring to fig. 1 and 2, the construction device for installing the highway variable cross-section steel box girder by dragging the sliding support comprises a sliding bearing frame 1, wherein the sliding bearing frame 1 comprises a bottom frame 11, four supporting columns 12 and a top frame 13; the bottom of the bottom frame 11 is fixedly connected with a pulley 111, a slide rail 8 is laid on the ground along the erecting direction of the steel box girder, the pulley 111 is placed on the slide rail 8, and the bottom frame 11 can slide along the erecting direction of the steel box girder; the four support columns 12 are all fixedly connected to the top of the bottom frame 11; the top frame 13 is horizontally placed above the bottom frame 11, the top frame 13 is fixedly connected with the four support columns 12, the steel box girder is placed on the top frame 13 and used for supporting the top frame 13, and the bottom frame 11 is moved, so that the steel box girder can be moved, the steel box girder is convenient to erect, the time for disassembling and assembling is reduced, and the problem of high construction cost of the steel box girder is solved; the ground is fixedly connected with a driving part 2, and the driving part 2 is used for pushing the sliding bearing frame 1 to move.

Referring to fig. 1 and 3, the driving part 2 includes a base plate 21, a motor 22, a mounting plate 23, a first screw cylinder 24, a first screw 25, a push plate 26, and a first stopper rod 27; the bottom plate 21 is fixedly connected to the ground; the motor 22 is arranged on the top of the bottom plate 21, and an output shaft of the motor 22 is horizontally arranged; the mounting plate 23 is fixedly connected to the top of the bottom plate 21; the first threaded cylinder 24 horizontally penetrates through the mounting plate 23, the first threaded cylinder 24 is rotatably connected with the mounting plate 23, and the first threaded cylinder 24 can be connected with the motor 22; the first screw 25 is threaded on the end surface of the first threaded cylinder 24 far away from the motor 22; the push plate 26 is fixedly connected to the end surface of the first screw 25 far away from the first threaded cylinder 24, and the push plate 26 can be in contact with the bottom frame 11; the first limiting rod 27 is fixedly connected to the side wall of the push plate 26, the first limiting rod 27 is horizontally arranged, and the first limiting rod 27 penetrates through the end face of the first threaded cylinder 24. Starting the motor 22, the motor 22 can drive the first screw thread cylinder 24 to rotate, the first screw thread cylinder 24 drives the first screw rod 25 to move, the first screw rod 25 drives the push plate 26 to move, and the push plate 26 pushes the bottom frame 11 to slide.

Referring to fig. 3 and 4, the push plate 26 is provided with a tightening part 3, and the tightening part 3 includes a connecting plate 31, a second threaded cylinder 32, a second screw 33, a tightening plate 34, and a second limiting rod 35; the connecting plate 31 is fixedly connected to the top of the push plate 26; the second threaded cylinder 32 vertically penetrates through the connecting plate 31, and the second threaded cylinder 32 is rotatably connected with the connecting plate 31; the second screw 33 is threaded at the bottom of the second threaded cylinder 32; the abutting plate 34 is fixedly connected to the bottom of the second screw 33, and the abutting plate 34 is in contact with the bottom frame 11; the second limiting rod 35 is fixedly connected to the top of the abutting plate 34, the second limiting rod 35 is vertically arranged, and the second limiting rod 35 penetrates through the second threaded cylinder 32. Rotate second screw thread section of thick bamboo 32, second screw thread section of thick bamboo 32 drives second screw rod 33 and removes, and second screw rod 33 drives and supports tight board 34 and remove, supports tight board 34 and extrudees underframe 11, can carry on spacingly to the bearing frame 1 that slides, has reduced the emergence that the bearing frame 1 that slides rocked the condition.

Referring to fig. 3 and 5, a dovetail block 222 is fixedly connected to the bottom of the motor 22, a dovetail groove 211 is formed in the top of the base plate 21, the dovetail block 222 is placed in the dovetail groove 211, the dovetail block 222 can slide along the dovetail groove 211, the dovetail block 222 can drive the motor 22 to move, the dovetail block 222 limits the motion track of the motor 22, the moving stability of the motor 22 is improved, the control part 5 is mounted on the base plate 21, and the control part 5 can be used for controlling the dovetail block 222 to move; the square block 221 of fixedly connected with on the output shaft of motor 22 has seted up square groove 241 on the terminal surface of first screw thread section of thick bamboo 24, and square block 221 can insert square groove 241, installs drive disk assembly 4 on the connecting plate 31, and motor 22 accessible drive disk assembly 32 rotates, has reduced the time that the staff operated second screw thread section of thick bamboo 32 and has spent, has improved staff's work efficiency.

Referring to fig. 3 and 4, the transmission part 4 includes a bearing plate 41, a telescopic rod 42, a first bevel gear 43, a second bevel gear 44, a third bevel gear 45, and a fourth bevel gear 46; the bearing plate 41 is fixedly connected to the top of the connecting plate 31; the telescopic rod 42 horizontally penetrates through the bearing plate 41, the telescopic rod 42 is rotatably connected with the bearing plate 41, and one end of the telescopic rod 42, which is far away from the bearing plate 41, is rotatably connected with the mounting plate 23; the first bevel gear 43 is sleeved on the second threaded cylinder 32, and the first bevel gear 43 is fixedly connected with the second threaded cylinder 32; the second bevel gear 44 is sleeved on the telescopic rod 42, the second bevel gear 44 is fixedly connected with the telescopic rod 42, and the second bevel gear 44 is meshed with the first bevel gear 43; the third bevel gear 45 is sleeved on the output shaft of the motor 22, and the third bevel gear 45 is fixedly connected with the output shaft of the motor 22; the fourth bevel gear 46 is sleeved on the telescopic rod 42, the fourth bevel gear 46 is fixedly connected with the telescopic rod 42, and the fourth bevel gear 46 is meshed with the third bevel gear 45; the motor 22 drives the third bevel gear 45 to rotate, the third bevel gear 45 drives the fourth bevel gear 46 to rotate, the fourth bevel gear 46 drives the telescopic rod 42 to rotate, the telescopic rod 42 drives the second bevel gear 44 to rotate, the second bevel gear 44 drives the first bevel gear 43 to rotate, the first bevel gear 43 drives the second threaded cylinder 32 to rotate, and the sliding bearing frame 1 can be limited.

Referring to fig. 3 and 5, the control part 5 includes an electromagnet 51, an iron piece 52, a storage battery 53, and a control spring 54; the electromagnet 51 is fixedly connected to the inner wall of the dovetail groove 211; the iron sheet 52 is fixedly connected to the side wall of the dovetail block 222, and the iron sheet 52 is matched with the electromagnet 51 for use; the storage battery 53 is fixedly connected to the side wall of the bottom plate 21, the storage battery 53 is electrically connected with the electromagnet 51 through a lead, the push plate 26 is provided with the switch component 6, and the switch component 6 can be used for controlling the storage battery 53 to electrify and cut off the electromagnet 51; the control spring 54 is fixedly connected to the inner wall of the dovetail groove 211, and the control spring 54 is fixedly connected to the dovetail block 222. In the process that the push plate 26 pushes the sliding bearing frame 1 to move, when the sliding bearing frame 1 stops moving, the switch component 6 controls the storage battery 53 to electrify the electromagnet 51 at the moment, the electromagnet 51 attracts the iron sheet 52, and the iron sheet 52 drives the dovetail block 222 to move, so that the motor 22 can be moved, and the working efficiency of workers is improved.

Referring to fig. 5 and 6, the push plate 26 has a mounting groove 261 formed on a side wall thereof facing the bottom frame 11, and the switch member 6 includes a switch spring 61, a switch block 62, a first contact 63, and a second contact 64; the switch spring 61 is fixedly connected to the inner wall of the mounting groove 261, and the switch spring 61 is horizontally arranged; the switch block 62 is placed in the mounting groove 261 in a sliding mode, the switch block 62 is fixedly connected with the switch spring 61, and the switch block 62 is in contact with the bottom frame 11; the first contact 63 is arranged on the switch block 62, and the first contact 63 is electrically connected with the electromagnet 51 through a conducting wire; the second contact 64 is arranged on the inner wall of the mounting groove 261, the second contact 64 is matched with the first contact 63 for use, the second contact 64 is electrically connected with the storage battery 53 through a conducting wire, when the first contact 63 is in contact with the second contact 64, the storage battery 53 can electrify the electromagnet 51, so that the motor 22 is moved, and the operation steps of workers are reduced; the switch block 62 is mounted with a separating member 7, and the separating member 7 can be used to separate the first contact 63 from the second contact 64.

Referring to fig. 6 and 7, a placing groove 621 is horizontally opened on the side wall of the switch block 62 facing the switch spring 61, and the separating member 7 includes a separating spring 71, a separating block 72 and a separating rod 73; the separation spring 71 is fixedly connected to the side wall of the placing groove 621, and the separation spring 71 is horizontally arranged; the separating block 72 is placed in the placing groove 621 in a sliding manner, the separating spring 71 is fixedly connected with the separating block 72, the first contact 63 is arranged at the top of the separating block 72, and an inclined surface 721 is formed on the side wall of the separating block 72; the separating rod 73 level is worn to establish on the lateral wall of push pedal 26, separating rod 73 can be worn to establish to the standing groove 621, separating rod 73 can contact with inclined plane 721, remove separating rod 73, separating rod 73 promotes the separation piece 72 and removes, separation spring 71 is the compression form this moment, when first contact 63 separates with second contact 64, control spring 54 drives dovetail piece 222 and removes, make square piece 221 insert in square groove 241, motor 22 drives push pedal 26 and withdraws, be convenient for promote underframe 11 next time.

The implementation principle of the construction device for installing the highway variable cross-section steel box girder by dragging the sliding support in the embodiment of the application is as follows: the motor 22 is started, the motor 22 drives the first threaded cylinder 24 to rotate, the first threaded cylinder 24 drives the first screw rod 25 to move, the first screw rod 25 drives the push plate 26 to move, the push plate 26 drives the switch block 62 to move, the switch block 62 pushes the bottom frame 11 to slide, the bottom frame 11 pushes the sliding bearing frame 1 to slide, and the sliding bearing frame 1 drives the steel box girder to move, so that the time for disassembling and assembling is reduced, and the problem of high construction cost of the steel box girder is solved; when the steel box girder stops moving, the push plate 26 continues to move, the switch block 62 moves relative to the push plate 26, when the first contact 63 is in contact with the second contact 64, the storage battery 53 can electrify the electromagnet 51, the electromagnet 51 attracts the iron sheet 52, the iron sheet 52 drives the dovetail block 222 to move, the dovetail block 222 drives the motor 22 to move, and the motor 22 drives the third bevel gear 45 to move; when the third bevel gear 45 meshes with the fourth bevel gear 46, the third bevel gear 45 drives the fourth bevel gear 46 to rotate, the fourth bevel gear 46 drives the telescopic rod 42 to rotate, the telescopic rod 42 drives the second bevel gear 44 to rotate, the second bevel gear 44 drives the first bevel gear 43 to rotate, the first bevel gear 43 drives the second threaded cylinder 32 to rotate, the second threaded cylinder 32 drives the second screw 33 to move, the second screw 33 drives the abutting plate 34 to move, the abutting plate 34 extrudes the sliding bearing frame 1, the sliding bearing frame 1 can be limited, and the occurrence of the shaking condition of the sliding bearing frame 1 is reduced.

When the push plate 26 needs to be retracted, the motor 22 is firstly rotated reversely, the motor 22 drives the abutting plate 34 to move towards one side far away from the sliding bearing frame 1, then the separating rod 73 is moved, the separating rod 73 pushes the separating block 72 to move, the separating spring 71 is in a compressed state at the moment, when the first contact 63 is separated from the second contact 64, the control spring 54 drives the dovetail block 222 to move, the square block 221 is inserted into the square groove 241, and the motor 22 drives the push plate 26 to be retracted, so that the sliding bearing frame 1 is conveniently pushed next time.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. Dragging and sliding bracket mounting highway variable cross-section steel box girder construction equipment, including being used for carrying out the bearing frame (1) that slides that supports and being used for promoting to slide bearing frame (1) and carry out drive unit (2) that remove, its characterized in that to the steel box girder: the sliding bearing frame (1) can slide along the erection direction of the steel box girder, and the driving part (2) comprises a bottom plate (21) fixedly arranged on the ground, a motor (22) arranged on the bottom plate (21), a mounting plate (23) fixedly connected to the bottom plate (21), a first threaded cylinder (24) rotatably arranged on the mounting plate (23), a first screw rod (25) with threads penetrating through the first threaded cylinder (24) and a push plate (26) fixedly connected to the first screw rod (25); the motor (22) is connected with the first threaded cylinder (24), a first limiting rod (27) is fixedly connected to the push plate (26), the first limiting rod (27) penetrates through the first threaded cylinder (24), and the push plate (26) is in contact with the sliding bearing frame (1).

2. The construction device of the variable cross-section steel box girder of the dragging sliding support installed road according to claim 1, characterized in that: the pressing plate (26) is provided with a pressing part (3) for extruding the sliding bearing frame (1), and the pressing part (3) comprises a connecting plate (31) fixedly connected to the pressing plate (26), a second threaded cylinder (32) rotatably installed on the connecting plate (31), a second screw rod (33) with threads penetrating through the second threaded cylinder (32) and a pressing plate (34) fixedly connected to the second screw rod (33); the tight supporting plate (34) is fixedly connected with a second limiting rod (35), the second limiting rod (35) penetrates through the second threaded cylinder (32), and the tight supporting plate (34) is in contact with the sliding bearing frame (1).

3. The construction device of the variable cross-section steel box girder of the dragging and sliding support installed road according to claim 2, characterized in that: the motor (22) is slidably mounted on the bottom plate (21), a square block (221) is fixedly connected to an output shaft of the motor (22), a square groove (241) for inserting the square block (221) is formed in the end face of the first threaded cylinder (24), a transmission part (4) is mounted on the connecting plate (31), and the motor (22) can drive the second threaded cylinder (32) to rotate through the transmission part (4).

4. The construction device of the variable cross-section steel box girder of the dragging and sliding support installed road according to claim 3, wherein: the transmission part (4) comprises a bearing plate (41) fixedly connected to the connecting plate (31) and an expansion rod (42) rotatably arranged on the bearing plate (41); one end, far away from the bearing plate (41), of the telescopic rod (42) is rotatably connected with the mounting plate (23), a first bevel gear (43) is fixedly arranged on the second threaded cylinder (32), and a second bevel gear (44) meshed with the first bevel gear (43) is fixedly arranged on the telescopic rod (42); a third bevel gear (45) is fixedly arranged on an output shaft of the motor (22), and a fourth bevel gear (46) which can be meshed with the third bevel gear (45) is fixedly arranged on the telescopic rod (42).

5. The construction device of the variable cross-section steel box girder of the dragging and sliding support installed road according to claim 3, wherein: the bottom fixedly connected with dovetail piece (222) of motor (22), dovetail groove (211) that supply dovetail piece (222) to place are seted up at the top of bottom plate (21), install on bottom plate (21) and be used for controlling dovetail piece (222) and carry out controlling means (5) that remove.

6. The construction device of the variable cross-section steel box girder of the dragging and sliding support installed road according to claim 5, wherein: the control component (5) comprises an electromagnet (51) fixedly connected to the inner wall of the dovetail groove (211), an iron sheet (52) fixedly connected to the dovetail block (222) and a storage battery (53) fixedly connected to the bottom plate (21); electromagnet (51) and iron sheet (52) cooperation are used, battery (53) are connected through the wire electricity with electromagnet (51), fixedly connected with control spring (54) on the inner wall of dovetail (211), control spring (54) and dovetail piece (222) fixed connection, install on push pedal (26) and be used for controlling battery (53) switch part (6) to electromagnet (51) circular telegram.

7. The construction device of the variable cross-section steel box girder of the dragging and sliding support installed road according to claim 6, wherein: the side wall of the push plate (26) facing the sliding bearing frame (1) is provided with a mounting groove (261), the switch component (6) comprises a switch spring (61) fixedly connected to the inner wall of the mounting groove (261) and a switch block (62) placed in the mounting groove (261) in a sliding mode, the switch block (62) is fixedly connected with the switch spring (61), and the switch block (62) is in contact with the sliding bearing frame (1); the switch block (62) is provided with a first contact (63), and the first contact (63) is electrically connected with the electromagnet (51) through a lead; a second contact (64) matched with the first contact (63) is arranged on the inner wall of the mounting groove (261), and the second contact (64) is electrically connected with the storage battery (53) through a lead; the switch block (62) is provided with a separation component (7) for separating the first contact (63) and the second contact (64).

8. The construction device of the variable cross-section steel box girder of the dragging and sliding support installed road according to claim 7, wherein: the switch comprises a switch block (62), and is characterized in that a placing groove (621) is formed in the side wall of the switch block (62), a separating part (7) comprises a separating spring (71) fixedly connected to the side wall of the placing groove (621) and a separating block (72) slidably placed in the placing groove (621), the separating spring (71) is fixedly connected with the separating block (72), a first contact (63) is arranged on the separating block (72), a separating rod (73) penetrates through the side wall of a push plate (26), the separating rod (73) can penetrate through the placing groove (621), an inclined surface (721) is formed in the side wall of the separating block (72), and the separating rod (73) can be in contact with the inclined surface (721).