A method for reducing the deflection of the main beam of a single-beam down-type bridge erection machine when spanning a hole

Abstract

The present invention discloses a method for reducing the winding of a bridge erection main beam when a single-beam downward bridge erection machine spans a hole. The method for reducing the winding of a bridge erection main beam comprises the following steps: a guide beam is extended above a first pier, a front leg is opened and supported on the pier and the guide beam is lifted upward, at which time a frame is pushed to the vicinity of a middle leg, a telescopic oil cylinder piston rod is extended and supported on a support frame and the bridge erection main beam is lifted, the middle leg is suspended away from a second pier, a bracket trolley is moved to the bottom of the bridge erection main beam, close to the middle leg, and then the oil cylinder piston rod is retracted. The present invention increases a support point near the middle leg of the first bridge erection main beam, solves the problem of middle sagging when spanning a hole, thereby reducing the middle deflection and reducing the resistance of the bridge erection main beam when spanning a hole, increases a bracket trolley support point near the middle leg of the second bridge erection main beam, thereby enhancing the stability of the whole machine during the spanning hole process, increasing the safety of transporting the bridge erection main beam and improving work efficiency.

Description

Technical Field

[0001] The invention relates to a method for reducing the deflection of a bridge main beam, in particular to a method for reducing the deflection of a bridge main beam when a single-beam descending bridge erecting machine crosses a hole, and belongs to the technical field of single-beam descending bridge erecting machine cross-hole application. Background Art

[0002] In the bridge-building industry, in order to meet the needs of continuous bridge building, the bridge-building machine will build the bridge between two piers and then turn to build the beam between the next two piers, thus realizing continuous bridge building. Now the steps of the bridge-building machine to cross the hole are: the guide beam extends from the bridge-building main beam of the bridge-building machine, and the front leg is fixed on the guide beam. When the guide beam extends above the next pier, it stops, and the front leg is opened to support the pier and lift the guide beam upward; then the cross-hole power mechanism at the end of the bridge-building main beam rotates downward and the walking wheel supports the bridge deck and lifts the bridge-building main beam upward, so that the rear leg leaves the bridge deck, and the middle leg also leaves the pier, that is, the rear leg and the middle leg are both in a suspended state. The cross-hole power mechanism of the bridge-building main beam pushes the bridge-building main beam together with the rear leg and the middle leg to run forward along the guide beam until the bridge-building main beam moves to the appropriate position, the cross-hole power mechanism at the end of the bridge-building main beam is retracted, the front leg is retracted, the rear leg falls back on the bridge deck, the middle leg is supported on the pier, and the cross-hole is completed.

[0003] The existing patent authorization announcement number is CN201485790U, which is a balanced single-beam bridge-erecting machine. The balanced single-beam bridge-erecting machine can realize the erection of single-track or double-track railway T-beams with a curvature radius greater than or equal to 500 meters. However, the balanced single-beam bridge-erecting machine cannot solve the problem of middle sagging when crossing holes, and the problem of large middle deflection cannot be solved. At the same time, it is also difficult to solve the problem of quickly moving the main beam of the bridge. For this reason, we propose a method for reducing the deflection of the main beam of the bridge when the single-beam downward bridge-erecting machine crosses holes. Summary of the invention

[0004] The purpose of the present invention is to adjust the height of the entire bridge beam by operating the telescopic cylinders on both sides of the frame, place the bracket trolley at the bottom of the bridge beam, and operate the telescopic cylinders again to make the bridge beam and the bracket trolley cooperate with each other to achieve the placement of the bracket trolley, and drive the adjusting rod to rotate through the cross-hole power mechanism, so that the adjusting rod supports the bridge beam, and the walking wheels contact the ground. With the cooperation of the walking wheels and the bracket trolley, the position of the bridge beam can be changed.

[0005] The technical problems solved by the present invention are:

[0006] (1) How to adjust the height of the entire bridge girder by operating the telescopic cylinders on both sides of the frame, so as to place the trolley at the bottom of the bridge girder. By operating the telescopic cylinders again, the bridge girder and the trolley can cooperate with each other to achieve the placement of the trolley, thereby solving the problem of the difficulty in achieving rapid placement of the trolley in the prior art;

[0007] (2) How to use the cross-hole power mechanism to drive the adjustment rod to rotate, so that the adjustment rod supports the main beam of the bridge, the walking wheels are in contact with the ground, and the position of the main beam of the bridge is changed with the cooperation of the walking wheels and the bracket trolley, so as to solve the problem of difficulty in quickly moving the main beam of the bridge in the existing technology.

[0008] The object of the present invention can be achieved by the following technical scheme: a method for reducing the deflection of the bridge main beam when a single-beam down-type bridge erecting machine spans a hole, and the method for reducing the deflection of the bridge main beam comprises the following steps:

[0009] The guide beam extends to the top of the first pier, the front outrigger opens to support on the pier and lifts the guide beam upward. At this time, the frame is pushed to the vicinity of the middle outrigger, the telescopic cylinder piston rod extends to support on the support frame and lifts the bridge beam, the middle outrigger leaves the second pier and hangs in the air, the bracket trolley is moved to the bottom of the bridge beam, close to the middle outrigger, and then the cylinder piston rod is retracted, the bridge beam falls back and is supported on the bracket trolley, then the end span power mechanism of the bridge beam rotates downward, the walking wheels are supported on the support frame and the bridge beam is lifted upward, so that the rear outrigger leaves the bridge deck. At this time, the bracket trolley support position is in the middle position between the rear outrigger and the front outrigger, which has the effect of lifting the bridge beam, reducing the middle sagging of the bridge beam, guide beam and middle outrigger caused by their own weight, thereby reducing The middle deflection is reduced, the cross-hole power mechanism at the end of the bridge beam rotates downward, the walking wheels are supported on the top of the support frame and lift the bridge beam upward, so that the rear leg leaves the support frame, and the cross-hole power mechanism pushes the bridge beam together with the rear leg and the middle leg to move forward along the guide beam. When the rear leg moves to the position of the bracket trolley, it stops. At this time, the fulcrums at both ends of the span of the bridge erection machine are close to the distance in front of the span, the piston rod of the telescopic cylinder on the frame extends out to support the bridge deck and lift the bridge beam, the bracket trolley is removed, and then the piston rod of the telescopic cylinder is retracted, the bridge beam falls back, and the cross-hole power mechanism continues to operate until the bridge beam and the middle leg stop, the cross-hole power mechanism at the end of the bridge beam is retracted, the front leg is retracted, the rear leg falls back on the bridge deck, and the middle leg is supported on the bridge pier to complete the span.

[0010] A further technical improvement of the present invention is that: a first pier, a second pier and a third pier are arranged below the support frame, and the tops of the third pier and the second pier are respectively fixedly connected to the bottoms of both ends of the support frame, a bridge beam is arranged above the support frame, a guide beam is slidably connected in the bridge beam, and one end of the guide beam passes through the end of the bridge beam;

[0011] One end of the bridge main beam is rotatably connected with an adjusting rod through a cross-hole power mechanism, a walking wheel is installed at the bottom of the end of the adjusting rod away from the bridge main beam, and a mounting frame is sleeved and fixed at the end of the bridge main beam close to the adjusting rod, a rear leg is installed on the top of the mounting frame, and the top of the rear leg passes through the bridge main beam and contacts with the top of the support frame, and the other end of the bridge main beam is sleeved and fixed with a limiting frame, a middle leg is arranged above the limiting frame, and the bottom of the middle leg passes through the bridge main beam and contacts with the second bridge pier;

[0012] A frame is sleeved on the outside of the bridge main beam between the rear leg and the middle leg, and fixed seats are symmetrically fixed on both sides of the frame. A telescopic oil cylinder is fixed inside the fixed seat, and the output shaft end of the telescopic oil cylinder passes through the bottom of the fixed seat;

[0013] A bracket trolley is arranged on the top of the support frame, and the bracket trolley is located directly below the bridge main beam, and the bracket trolley cooperates with the bridge main beam;

[0014] Among them, a front support leg is installed at one end of the guide beam that passes through the main bridge beam, and the bottom end of the front support leg is in contact with the first pier.

[0015] A further technical improvement of the present invention is that the bracket trolley is composed of a pulley, a support, a rotating shaft and a sleeper, a sleeper is arranged on the top of the support frame, a support is fixed on the top of the sleeper, a rotating shaft is symmetrically arranged inside the support, a pulley is sleeved on the outer side of the rotating shaft, and the pulley is rotatably connected to the rotating shaft through a bearing.

[0016] A further technical improvement of the present invention is that a fixing plate is fixed to the bottom of the frame, and the fixing plate cooperates with the supporting frame.

[0017] A further technical improvement of the present invention is that the first pier, the second pier and the third pier are arranged at equal distances.

[0018] A further technical improvement of the present invention is that the frame is slidably connected to the outer side of the bridge main beam.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] When the present invention is in use, a frame is mounted on the outer cover of the bridge main beam, and the telescopic oil cylinder is installed on both sides of the frame through a fixed seat. When not in use, the piston rod of the telescopic oil cylinder is retracted and is not connected with the support frame. When the guide beam is extended to the top of the first pier, the front legs are opened and supported on the pier and the guide beam is lifted upward. At this time, the frame is pushed to the vicinity of the middle legs, and the piston rod of the telescopic oil cylinder is extended to support on the support frame and lift the bridge main beam. The middle legs leave the second pier and hang in the air, and the bracket trolley is moved to the bottom of the bridge main beam, close to the middle legs, and then the cylinder piston rod is retracted, and the bridge main beam falls back and is supported on the bracket trolley. The height of the entire bridge main beam is adjusted by the operation of the telescopic oil cylinders on both sides of the frame, so that the bracket trolley is placed at the bottom of the bridge main beam. The telescopic oil cylinder works again, so that the bridge main beam and the bracket trolley cooperate with each other to realize the placement of the bracket trolley. The structure is simple, the operation is convenient, the time for installing the bracket trolley is saved, and the work efficiency is improved.

[0021] 2. The span-hole power mechanism at the end of the bridge-erecting main beam rotates downward, the walking wheel is supported on the top of the support frame and lifts the bridge-erecting main beam upward, so that the rear outrigger leaves the support frame, and the span-hole power mechanism pushes the bridge-erecting main beam together with the rear outrigger and the middle outrigger to move forward along the guide beam. When the rear outrigger moves to the position of the bracket trolley, it stops. At this time, the fulcrums at both ends of the span-hole of the bridge-erecting machine are close to the distance in front of the span-hole; the piston rod of the telescopic cylinder on the frame extends out to support the bridge deck and lift the bridge-erecting main beam, the bracket trolley is removed, and then the piston rod of the telescopic cylinder is retracted, the bridge-erecting main beam falls back, and the span-hole power mechanism continues to operate until the bridge-erecting main beam and the middle outrigger stop, passing through the span. The hole power mechanism drives the adjusting rod to rotate, so that the adjusting rod supports the bridge main beam, and the walking wheel contacts the ground. With the cooperation of the walking wheel and the bracket trolley, the position of the bridge main beam is changed. A support point is added near the middle support leg of the first bridge main beam, which solves the problem of middle sagging when spanning the hole, thereby reducing the middle deflection and reducing the resistance of the bridge main beam when spanning the hole. A bracket trolley support point is added near the middle support leg of the second bridge main beam, thereby enhancing the stability of the whole machine during the spanning process, saving manual time for adding bridges bit by bit, increasing the safety of bridge main beam transportation, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of the bridge main beam before it moves;

[0024] Figure 2 This is a schematic diagram of the structure of the bridge main beam after movement of the present invention;

[0025] Figure 3 It is a schematic diagram of the framework structure of the present invention;

[0026] Figure 4It is a schematic diagram of the side structure of the frame of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the bracket trolley of the present invention.

[0028] In the figure: 1. bridge main beam; 2. frame; 3. fixed plate; 4. telescopic cylinder; 5. fixed seat; 6. guide beam; 7. front leg; 8. first pier; 9. cross-hole power mechanism; 10. walking wheel; 11. bracket trolley; 12. pulley; 13. support; 14. rotating shaft; 15. sleeper; 16. middle leg; 17. rear leg; 18. second pier; 19. mounting frame; 20. support frame; 21. third pier; 22. adjusting rod; 23. limit frame. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-5 As shown, a method for reducing the deflection of the main beam of the bridge erection when a single-beam down-type bridge erection machine spans a hole, the method for reducing the deflection of the main beam of the bridge erection comprises the following steps:

[0031] The guide beam 6 extends to the top of the first pier 8, the front leg 7 opens and supports on the pier and lifts the guide beam 6 upward. At this time, the frame 2 is pushed to the vicinity of the middle leg 16, and the piston rod of the telescopic cylinder 4 extends out to support on the support frame 20 and lifts the bridge main beam 1. The middle leg 16 leaves the second pier 18 and hangs in the air. The bracket trolley 11 is moved to the bottom of the bridge main beam 1, close to the middle leg 16, and then the cylinder piston rod is retracted, the bridge main beam 1 falls back and is supported on the bracket trolley 11. Subsequently, the cross-hole power mechanism 9 at the end of the bridge main beam 1 rotates downward, and the walking wheel 10 is supported on the support frame 20 and lifts the bridge main beam 1 upward, so that the rear leg 17 leaves the bridge deck. At this time, the bracket trolley 11 is supported in the middle position between the rear leg 17 and the front leg 7, which has a lifting effect on the bridge main beam 1, reducing the middle sagging caused by the dead weight of the bridge main beam 1, the guide beam 6 and the middle leg 16. The intermediate deflection is reduced, and the cross-hole power mechanism 9 at the end of the bridge main beam 1 rotates downward, and the walking wheel 10 is supported on the top of the support frame 20 and lifts the bridge main beam 1 upward, so that the rear leg 17 leaves the support frame 20, and the cross-hole power mechanism 9 pushes the bridge main beam 1 together with the rear leg 17 and the middle leg 16 to move forward along the guide beam 6. When the rear leg 17 walks to the position of the bracket trolley 11, it stops. At this time, the fulcrums at both ends of the bridge erection machine span the hole close to the distance before the span, the piston rod of the telescopic cylinder 4 on the frame 2 extends out to support the bridge deck and lift the bridge main beam 1, remove the bracket trolley 11, and then the piston rod of the telescopic cylinder 4 is retracted, the bridge main beam 1 falls back, and the cross-hole power mechanism 9 continues to run until the bridge main beam 1 and the middle leg 16 stop, the cross-hole power mechanism 9 at the end of the bridge main beam 1 is retracted, the front leg 7 is retracted, the rear leg 17 falls back on the bridge deck, and the middle leg 16 is supported on the bridge pier to complete the span.

[0032] The first bridge pier 8, the second bridge pier 18 and the third bridge pier 21 are arranged below the support frame 20, and the tops of the third bridge pier 21 and the second bridge pier 18 are respectively fixedly connected to the bottoms of both ends of the support frame 20, and a bridge main beam 1 is arranged above the support frame 20, and a guide beam 6 is slidably connected inside the bridge main beam 1, and one end of the guide beam 6 passes through the end of the bridge main beam 1;

[0033] One end of the bridge main beam 1 is rotatably connected to an adjusting rod 22 through a cross-hole power mechanism 9, a walking wheel 10 is installed at the bottom of the end of the adjusting rod 22 away from the bridge main beam 1, and a motor is fixed in the adjusting rod 22, and the end of the output shaft of the motor is fixedly connected to the center of one end of the walking wheel 10, and the end of the bridge main beam 1 close to the adjusting rod 22 is sleeved and fixed with a mounting frame 19, and a rear support leg 17 is installed on the top of the mounting frame 19, and the top of the rear support leg 17 passes through the bridge main beam 1 and contacts with the top of the support frame 20, and the other end of the bridge main beam 1 is sleeved and fixed with a limiting frame 23, and a middle support leg 16 is arranged above the limiting frame 23, and the bottom of the middle support leg 16 passes through the bridge main beam 1 and contacts with the second bridge pier 18;

[0034] A frame 2 is sleeved on the outside of the bridge main beam 1 between the rear leg 17 and the middle leg 16, and fixed seats 5 are symmetrically fixed on both sides of the frame 2. A telescopic cylinder 4 is fixed inside the fixed seat 5, and the output shaft end of the telescopic cylinder 4 passes through the bottom of the fixed seat 5;

[0035] A bracket trolley 11 is provided on the top of the support frame 20, and the bracket trolley 11 is located directly below the bridge main beam 1, and the bracket trolley 11 cooperates with the bridge main beam 1;

[0036] Among them, a front support leg 7 is installed at one end of the guide beam 6 that passes through the bridge main beam 1, and the bottom end of the front support leg 7 is in contact with the first pier 8.

[0037] The bracket trolley 11 is composed of a pulley 12, a support 13, a rotating shaft 14 and a sleeper 15. The sleeper 15 is arranged on the top of the support frame 20, and the support 13 is fixed on the top of the sleeper 15. The rotating shaft 14 is symmetrically arranged inside the support 13. The pulley 12 is sleeved on the outer side of the rotating shaft 14, and the pulley 12 is rotatably connected to the rotating shaft 14 through a bearing. Through the arrangement of the pulley 12, the support 13, the rotating shaft 14 and the sleeper 15, it is convenient to change the position of the bracket trolley 11, so as to realize the taking and placing of the bracket trolley 11.

[0038] A fixing plate 3 is fixed to the bottom of the frame 2 , and the fixing plate 3 cooperates with the support frame 20 . The setting of the fixing plate 3 increases the strength of the frame 2 .

[0039] The first pier 8, the second pier 18 and the third pier 21 are equidistantly arranged, and the stability and safety of the bridge construction are increased by equidistantly arranged first pier 8, second pier 18 and third pier 21.

[0040] The frame 2 is slidably connected to the outside of the bridge beam 1. By slidably connecting the frame 2 to the outside of the bridge beam 1, it is convenient to change the position of the frame 2 and adjust the supporting position of the bridge beam 1.

[0041] Working principle: When the present invention is in use, first, a frame 2 is mounted on the outer sleeve of the bridge main beam 1. The frame 2 can move on the bridge main beam 1. When not in use, it can be pushed to the side of the near-middle leg 16 so as not to interfere with the bridge feed beam. The fixing plate 3 fixed at the bottom of the frame 2 increases the supporting strength of the frame 2. The telescopic cylinder 4 is installed on both sides of the frame 2 through the fixing seat 5. When not in use, the piston rod of the telescopic cylinder 4 is retracted and does not contact the support frame 20. When the guide beam 6 extends to the top of the first bridge pier 8, the front leg 7 is opened to support on the bridge pier and lift the guide beam 6 upward. At this time, the frame 2 is pushed to the middle Near the outrigger 16, the piston rod of the telescopic oil cylinder 4 extends out to support on the support frame 20 and lift the bridge girder 1. The middle outrigger 16 leaves the second pier 18 and hangs in the air. The bracket trolley 11 is moved to the bottom of the bridge girder 1, close to the middle outrigger 16. Then the oil cylinder piston rod is retracted, and the bridge girder 1 falls back and is supported on the bracket trolley 11. Subsequently, the cross-hole power mechanism 9 at the end of the bridge girder 1 rotates downward, and the walking wheel 10 is supported on the support frame 20 and lifts the bridge girder 1 upward, so that the rear outrigger 17 leaves the bridge deck. At this time, the bracket trolley 11 is supported on the rear outrigger The bridge main beam 1 is lifted up to the middle position between the front leg 17 and the front leg 7, thereby reducing the middle droop caused by the deadweight of the bridge main beam 1, the guide beam 6 and the middle leg 16, thereby reducing the middle deflection. The cross-hole power mechanism 9 at the end of the bridge main beam 1 rotates downward, and the walking wheel 10 is supported on the top of the support frame 20 and lifts the bridge main beam 1 upward, so that the rear leg 17 leaves the support frame 20. The cross-hole power mechanism 9 pushes the bridge main beam 1 together with the rear leg 17 and the middle leg 16 to run forward along the guide beam 6. When the leg 17 moves to the position of the bracket trolley 11, it stops. At this time, the fulcrums at both ends of the span of the bridge erection machine are close to the distance in front of the span; the piston rod of the telescopic cylinder 4 on the frame 2 extends out to support the bridge deck and lift the bridge erection main beam 1, and the bracket trolley 11 is removed. Then the piston rod of the telescopic cylinder 4 is retracted, the bridge erection main beam 1 falls back, and the span power mechanism 9 continues to operate until the bridge erection main beam 1 and the middle leg 16 stop, the span power mechanism 9 at the end of the bridge erection main beam 1 is retracted, the front leg 7 is retracted, the rear leg 17 falls back on the bridge deck, the middle leg 16 is supported on the bridge pier, and the span is completed.

[0042] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for reducing the deflection of the main beam of a single-beam down-type bridge erection machine when spanning a hole, characterized in that: The method for reducing the deflection of the bridge main beam comprises the following steps: The guide beam (6) extends to the top of the first bridge pier (8), the front legs (7) are opened to support on the bridge pier and lift the guide beam (6) upwards, at this time the frame (2) is pushed to the vicinity of the middle legs (16), the piston rod of the telescopic oil cylinder (4) extends to support on the support frame (20) and lifts the bridge main beam (1), the middle legs (16) leave the second bridge pier (18) and hang in the air, the bracket trolley (11) is moved to the bottom of the bridge main beam (1), close to the middle legs (16), then the cylinder piston rod is retracted, the bridge main beam (1) falls back and is supported on the bracket The supporting trolley (11) is mounted on the bridge girder (1), and then the end span power mechanism (9) of the bridge girder (1) rotates downwardly to support the walking wheel (10) on the support frame (20) and lifts the bridge girder (1) upward, so that the rear leg (17) leaves the bridge deck. At this time, the supporting position of the supporting trolley (11) is in the middle position between the rear leg (17) and the front leg (7), which has the function of supporting the bridge girder (1), thereby reducing the middle downward pressure on the bridge girder (1) and the guide beam (6) caused by the deadweight of the bridge girder (1), the guide beam (6) and the middle leg (16). The cross-hole power mechanism (9) at the end of the bridge main beam (1) rotates downward, and the travel wheel (10) is supported on the top of the support frame (20) and lifts the bridge main beam (1) upward, so that the rear support leg (17) leaves the support frame (20). The cross-hole power mechanism (9) pushes the bridge main beam (1) together with the rear support leg (17) and the middle support leg (16) to move forward along the guide beam (6). When the rear support leg (17) moves to the position of the bracket trolley (11), it stops. At this time, the two end fulcrums of the bridge machine across the hole are close to each other. When the distance before the span hole is reached, the piston rod of the telescopic cylinder (4) on the frame (2) is extended to support the bridge deck and lift the bridge main beam (1), the bracket trolley (11) is removed, and then the piston rod of the telescopic cylinder (4) is retracted, the bridge main beam (1) falls back, and the span hole power mechanism (9) continues to operate until the bridge main beam (1) and the middle leg (16) stop, the span hole power mechanism (9) at the end of the bridge main beam (1) is retracted, the front leg (7) is retracted, the rear leg (17) falls back on the bridge deck, and the middle leg (16) is supported on the bridge pier, completing the span hole; A first bridge pier (8), a second bridge pier (18) and a third bridge pier (21) are arranged below the support frame (20), and the tops of the third bridge pier (21) and the second bridge pier (18) are respectively fixedly connected to the bottoms of both ends of the support frame (20), and a bridge main beam (1) is arranged above the support frame (20), and a guide beam (6) is slidably connected inside the bridge main beam (1), and one end of the guide beam (6) passes through the end of the bridge main beam (1); One end of the bridge main beam (1) is rotatably connected to an adjusting rod (22) through a cross-hole power mechanism (9); a walking wheel (10) is installed at the bottom of the end of the adjusting rod (22) away from the bridge main beam (1); an installation frame (19) is sleeved and fixed at the end of the bridge main beam (1) close to the adjusting rod (22); a rear support leg (17) is installed on the top of the installation frame (19); the top of the rear support leg (17) passes through the bridge main beam (1) and contacts the top of the support frame (20); the other end of the bridge main beam (1) is sleeved and fixed to a limiting frame (23); a middle support leg (16) is arranged above the limiting frame (23); the bottom of the middle support leg (16) passes through the bridge main beam (1) and contacts the second bridge pier (18); A frame (2) is sleeved on the outside of the bridge main beam (1) and located between the rear support leg (17) and the middle support leg (16); fixed seats (5) are symmetrically fixed on both sides of the frame (2); a telescopic oil cylinder (4) is fixed inside the fixed seat (5), and the output shaft end of the telescopic oil cylinder (4) passes through the bottom of the fixed seat (5); A bracket trolley (11) is arranged on the top of the support frame (20), and the bracket trolley (11) is located directly below the bridge main beam (1), and the bracket trolley (11) cooperates with the bridge main beam (1); Wherein, a front support leg (7) is installed at one end of the guide beam (6) passing through the bridge main beam (1), and the bottom end of the front support leg (7) is in contact with the first bridge pier (8).

2. The method for reducing the deflection of the main beam of a single-beam down-type bridge erection machine when spanning a hole according to claim 1 is characterized in that: The bracket trolley (11) is composed of a pulley (12), a support (13), a rotating shaft (14) and a sleeper (15). The sleeper (15) is arranged on the top of the support frame (20), the support (13) is fixed on the top of the sleeper (15), the rotating shaft (14) is symmetrically arranged inside the support (13), the pulley (12) is sleeved on the outer side of the rotating shaft (14), and the pulley (12) is rotatably connected to the rotating shaft (14) through a bearing.

3. The method for reducing the deflection of the main beam of a single-beam down-type bridge erection machine when spanning a hole according to claim 1 is characterized in that: A fixing plate (3) is fixed to the bottom of the frame (2), and the fixing plate (3) matches with the supporting frame (20).

4. The method for reducing the deflection of the main beam of a single-beam down-type bridge erection machine when spanning a hole according to claim 1 is characterized in that: The first bridge pier (8), the second bridge pier (18) and the third bridge pier (21) are arranged at equal distances from each other.

5. The method for reducing the deflection of the main beam of a single-beam down-type bridge erection machine when spanning a hole according to claim 1 is characterized in that: The frame (2) is slidably connected to the outer side of the bridge main beam (1).

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