Method for erecting bridge girder erection machine for ultra-small radius curve girder bridge

Abstract

The invention discloses an erecting method of a bridge girder erection machine for an ultra-small radius curve girder bridge, which comprises the following steps of: through a self-adaptive rotary front support leg, a middle support leg and a parallel connection, realizing that the maximum transverse movement amount of the front support leg is 57cm, the rotation angle is 2 degrees at the moment, and the front support leg and a track thereof are staggered by 15cm in the longitudinal bridge direction; meanwhile, the distance adjusting amount of the main beam of the bridge girder erection machine on the upper roller box of the middle supporting leg is + / -5cm, the maximum transverse movement amount of the front supporting leg reaches 253cm, and at the moment, the rotating angle is 8 degrees; the parallel connection adopts a hinged form and can adaptively rotate in the steering process of the bridge girder erection machine. The posture adjustment of the bridge girder erection machine under the ultra-small radius is realized through the alternate self-adaptive rotation and the parallel connection of the front supporting leg and the middle supporting leg. According to posture simulation of a bridge girder erection machine in boundary beam erection construction, the lateral anti-overturning stability and the safety of a middle supporting leg structure are checked, meanwhile, due to the fact that the bearing capacity of a small T-beam flange is limited, supporting cushion profile steel is lowered on a flange plate, and therefore cantilever erection of an ultra-small-radius lower boundary beam is achieved.

Description

Technical Field

[0001] The invention relates to the field of bridge erection machine construction, and in particular to a bridge erection machine erection method for an ultra-small radius curved beam bridge. Background Art

[0002] For ultra-small radius curved beam bridges located on high and steep slopes, there are characteristics such as poor geological conditions, high bridge piers, and narrow working sites. If cast-in-place construction with brackets or beam erection on crane beams is adopted, the safety risks are high and the construction period is long. At present, the construction technology of conventional bridge erection machines can only complete the beam erection of curved bridges with a radius of about 100m. If conventional highway bridge erection machines are used for beam erection in the construction of ultra-small radius curved beam bridges of 40m, many problems will be faced, such as the inability of the bridge erection machine to pass through the hole, the inability of the beam transport vehicle to feed the beam, and the difficulty of putting the side beam in place. Summary of the invention

[0003] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a method for erecting a bridge erector for an ultra-small radius curved beam bridge; an adaptive rotating front leg, middle leg and flat joint are developed, and the maximum lateral displacement of the front leg is 57 cm, at which time the rotation angle is 2°, and the front leg and its track are staggered by 15 cm in the longitudinal direction of the bridge; at the same time, the spacing adjustment amount of the bridge erector main beam on the middle leg upper wheel box is ±5 cm, and the maximum lateral displacement of the front leg reaches 253 cm, at which time the rotation angle is 8°; the flat joint adopts an articulated form, and can adaptively rotate during the steering process of the bridge erector. The alternating adaptive rotation of the front leg and the middle leg and the articulated connection of the flat joint realize the posture adjustment of the bridge erector under an ultra-small radius.

[0004] The present invention is implemented in this way, and a method for erecting a bridge erecting machine for constructing an ultra-small radius curved beam bridge is characterized in that: through the adaptive rotating front legs, middle legs and flat joints, the maximum lateral displacement of the front legs is 57 cm, and the rotation angle is 2° at this time, and the front legs and their tracks are staggered by 15 cm in the longitudinal bridge direction; at the same time, the spacing adjustment amount of the bridge erecting machine main beam on the middle leg upper wheel box is ±5 cm, and the maximum lateral displacement of the front legs reaches 253 cm, and the rotation angle is 8° at this time; the flat joint adopts an articulated form, and can adaptively rotate during the steering process of the bridge erecting machine; the alternating adaptive rotation of the front legs and the middle legs and the articulated connection of the flat joint realize the posture adjustment of the bridge erecting machine under the ultra-small radius;

[0005] Optimize the outrigger and track structure. During the erection of the side beam, the track at the middle outrigger is in a cantilever state. According to the posture simulation of the bridge erection machine during the erection of the side beam, the lateral anti-overturning stability and the safety of the middle outrigger structure are verified. At the same time, due to the limited bearing capacity of the small T-beam flange, support steel is placed under the flange plate to achieve the cantilever erection of the ultra-small radius lower side beam;

[0006] The main beam walking type front outrigger structure is adopted. If the beam cannot be fed normally, the main beam will move forward to ensure that the rear outrigger is on the T-beam and the beam transport vehicle can feed the beam normally from the tail of the bridge erecting machine, ensuring the smooth feeding of prefabricated beams under ultra-small radius. The walking trajectory of the beam transport vehicle is simulated based on the on-site conditions to determine the wheel track of the beam transport vehicle and the position of the steel plate. At the same time, for the design route of the ultra-small radius curved bridge, the posture simulation of the full-span walking and beam erection of the bridge erecting machine was carried out. According to the simulation results, the point control was carried out on-site, and the posture of the bridge erecting machine during the turning span and beam erection was controlled, ensuring the safety and reliability of the beam erection process.

[0007] According to the method for erecting a bridge erector for an ultra-small radius curved beam bridge described in this application, the specific construction process is as follows:

[0008] (1) Move the bridge erector along the track to the center of the bridge deck, move the front outrigger 0.57 m to the inside of the turn, move the main beam 1 forward 15 cm, and rotate the bridge erector 2° along the inside. At this time, the front outrigger and the middle outrigger are under stress, while the counter bracket and the rear outrigger are not under stress;

[0009] (2) The crane moves to between the middle outrigger and the rear outrigger, uses the middle outrigger as a fulcrum, uses the crane steel rope to hold the beam counterweight, retracts the steel rope to lift the front outrigger, adjusts the front outrigger track, and returns the angle between the front outrigger and the truss to the initial state. Then, loosen the crane lifting rope to allow the front outrigger to touch the ground, and then rotate again;

[0010] (3) Repeat steps (1) and (2) three times, the main beam rotates 8°, the front outrigger moves 253 cm laterally, the distance between the main beam of the bridge crane and the wheel box on the middle outrigger reaches the limit of 5 cm, and the main beam posture remains unchanged during the turning process;

[0011] (4) Use the front outrigger and the counter bracket to lift the middle outrigger off the beam surface, use the overhead crane to adjust the middle outrigger track so that the track is parallel to the front outrigger, and lower the main beam onto the middle outrigger supporting wheel again to achieve the re-rotation of the bridge erecting machine;

[0012] (5) Repeat steps (1) to (4) until the front legs of the bridge erector can fall onto the next span cap beam after passing through the hole; after reaching the predetermined position, the front legs and the counter-bracket are subjected to force, the middle legs are moved to the position of 1m from the front legs, and then the middle legs and the rear legs are lifted up, and the counter-bracket is moved to the appropriate position in the middle front;

[0013] (6) Use the overhead crane to hold the beam and start passing the hole. At this time, the front and rear legs are off the ground, the middle legs and the counter-bracket are under force, and the overhead crane holds the erected beam and remains relatively still with the middle legs during the span-passing process to prevent the bridge erector from overturning until the front legs of the bridge erector are through the hole and placed on the cap beam of the next span;

[0014] (7) After the bridge erection machine has passed through the hole, the front outrigger falls on the next span cap beam, and steps (1) to (4) are repeated. The bridge erection machine is rotated 12°, and the front outrigger track is adjusted to be parallel to the middle outrigger track. The rear outrigger is padded with square wood to prepare for beam erection.

[0015] (8) The bridge erection machine is adjusted in place and the beams are fed according to the on-site transportation conditions. If the beams cannot be fed normally, the main beam needs to be moved forward to ensure that the rear legs are on the T-beam and can be fed normally. The beams are fed from the tail of the bridge erection machine by the beam transport vehicle to start the erection of this span;

[0016] (9) When the small radius side beam is erected, when the position of the bridge erecting machine is adjusted to erect the side beam, the track at the middle leg position of the bridge erecting machine is often in a cantilever state, which is not conducive to the stress on the middle leg track. By optimizing the leg and track structure according to the erection state of the small radius side beam of each span, and verifying the lateral anti-overturning stability of the bridge erecting machine and the stress on the middle leg during the side beam erection construction, the cantilever erection of the side beam is realized.

[0017] The present invention has the following advantages: (1) the posture adjustment of the bridge erection machine under ultra-small radius is realized through the adaptive rotating front legs, middle legs and parallel connection; (2) the leg and track structure is optimized to realize the cantilever erection of the side beam; the main beam walking type front leg structure is adopted to realize the forward movement of the main beam, thereby ensuring the smooth feeding of prefabricated beams under ultra-small radius; (3) for the design route of the ultra-small radius curved bridge, the posture simulation of the full-span walking and beam erection of the bridge erection machine is carried out, and the point control is carried out on site according to the simulation results, so that the posture of the bridge erection machine in the whole process of turning, crossing the span and erecting the beam can be controlled, thereby ensuring the safety and reliability of the beam erection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the bridge erecting machine posture adjustment;

[0019] Figure 2 Schematic diagram of the outrigger and track structure of the bridge erecting machine;

[0020] Figure 3 Schematic diagram of bridge erecting machine rotation;

[0021] Figure 4 Schematic diagram of the front outriggers and their tracks when the overhead crane moves backwards and presses down the counterweight;

[0022] Figure 5 Schematic diagram of the bridge erecting machine rotating and the front outrigger moving right;

[0023] Figure 6 Schematic diagram of adjusting the middle outrigger track to be parallel to the front and rear outriggers;

[0024] Figure 7 Schematic diagram of preparing the holes for the forward-moving legs and counter-bracket;

[0025] Figure 8 Schematic diagram of bridge erection machine through hole;

[0026] Fig. 9 Schematic diagram of bridge erection machine position adjustment;

[0027] Fig.10 Schematic diagram of the gun carriage feeding beam;

[0028] Fig.11 Schematic diagram of optimized track and outrigger installation for side beams. DETAILED DESCRIPTION

[0029] The following will be combined with the attached Figure 1-Figure 11 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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] The present invention provides a method for erecting a bridge erecting machine that is adapted to ultra-small radius curved beam bridges; in view of the above problems, the present invention proposes a method for erecting a bridge erecting machine that is adapted to ultra-small radius curved beam bridges. Adaptive rotating front legs, middle legs and parallel joints have been developed to achieve a maximum lateral displacement of 57 cm for the front legs, at which the rotation angle is 2°, and the front legs and their tracks are staggered by 15 cm in the longitudinal direction of the bridge; at the same time, the spacing adjustment amount of the bridge erecting machine main beam on the middle leg upper wheel box is ±5 cm, and the maximum lateral displacement of the front legs reaches 253 cm, at which the rotation angle is 8°; the parallel joint adopts an articulated form, and can adaptively rotate during the steering process of the bridge erecting machine. The alternating adaptive rotation of the front legs and the middle legs and the articulated connection of the parallel joint realize the posture adjustment of the bridge erecting machine under ultra-small radius. Figure 1 Schematic diagram of the bridge-building machine's posture adjustment.

[0031] The outrigger and track structure is optimized. During the erection of the side beams, the track at the middle outrigger position is in a cantilever state. According to the posture simulation of the bridge-building machine during the side beam erection construction, the lateral anti-overturning stability and the safety of the middle outrigger structure are verified. At the same time, due to the limited bearing capacity of the small T-beam flange, support steel is placed under the flange plate to achieve the cantilever erection of the side beam with an ultra-small radius. Figure 2 Schematic diagram of the outriggers and track structure of a bridge-building machine.

[0032] The main beam walking type front outrigger structure is adopted. If the beam cannot be fed normally, the main beam will move forward to ensure that the rear outrigger is on the T-beam and the beam transport vehicle can feed the beam normally from the tail of the bridge erecting machine, ensuring the smooth feeding of prefabricated beams under ultra-small radius. The walking trajectory of the beam transport vehicle is simulated based on the on-site conditions to determine the wheel track of the beam transport vehicle and the position of the steel plate. At the same time, for the design route of the ultra-small radius curved bridge, the posture simulation of the full-span walking and beam erection of the bridge erecting machine was carried out. According to the simulation results, the point control was carried out on-site, and the posture of the bridge erecting machine during the turning span and beam erection was controlled, ensuring the safety and reliability of the beam erection process.

[0033] The specific construction process is as follows:

[0034] (1) Move the bridge erector along the track to the center of the bridge deck, move the front outrigger 0.57 m to the inside of the turn, move the main beam 1 forward 15 cm, and rotate the bridge erector 2° along the inside. At this time, the front outrigger and the middle outrigger are under stress, while the counter-support and the rear outrigger are not under stress. Figure 3 Schematic diagram of bridge erection machine rotation.

[0035] (2) Move the overhead crane to between the middle outrigger and the rear outrigger, use the middle outrigger as a fulcrum, use the overhead crane steel rope to hold the beam counterweight, retract the steel rope to lift the front outrigger, adjust the front outrigger track, and return the angle between the front outrigger and the truss to the initial state. Then loosen the overhead crane lifting rope to allow the front outrigger to touch the ground, and then rotate again. Figure 4 Schematic diagram of the overhead crane moving backward and pressing down the counterweight to adjust the front outriggers and their tracks.

[0036] (3) Repeat steps (1) and (2) three times. The main beam rotates 8°, the front outrigger moves 253 cm laterally, and the distance between the main beam of the bridge crane and the wheel box on the middle outrigger reaches the limit of 5 cm. The posture of the main beam remains unchanged during the turning process. Figure 5 Schematic diagram of the bridge-building machine rotating and the front outrigger moving to the right.

[0037] (4) Use the front outrigger and the counter-support to lift the middle outrigger off the beam surface, use the overhead crane to adjust the middle outrigger track so that the track is parallel to the front outrigger, and lower the main beam onto the middle outrigger supporting wheel again to achieve the second rotation of the bridge erecting machine. Figure 6 Diagram of adjusting the middle outrigger track to be parallel to the front and rear outriggers

[0038] (5) Repeat steps (1)-(4) until the front legs of the bridge erector can fall onto the next span cap beam after passing through the hole. After reaching the predetermined position, the front legs and the counter-bracket are stressed, the middle legs are moved to a position 1m from the front legs, and then the middle legs and rear legs are lifted up, and the counter-bracket is moved to an appropriate position in the middle front. Figure 7 Schematic diagram of preparing the holes for the forward-moving middle legs and counter-bracket.

[0039] (6) Use the overhead crane to hold the beam and start passing the hole. At this time, the front legs and rear legs are off the ground, the middle legs and the counter-support are under force, and the overhead crane holds the erected beam and remains relatively still with the middle legs during the span-passing process to prevent the bridge erection machine from overturning until the front legs of the bridge erection machine have passed the hole and are placed on the cap beam of the next span. Figure 8 Schematic diagram of the bridge-building machine through-hole.

[0040] (7) After the bridge erection machine has passed through the hole, the front leg falls on the next span cap beam, and steps (1)-(4) are repeated. The bridge erection machine is rotated 12°, and the front leg track is adjusted to be parallel to the middle leg track. The rear leg is padded with square wood to prepare for beam erection. Fig. 9 Schematic diagram of bridge-building machine position adjustment.

[0041] (8) The bridge-erecting machine is adjusted into place and the beams are fed according to the on-site transportation conditions. If the beams cannot be fed normally, the main beam needs to be moved forward to ensure that the rear legs are on the T-beam and can be fed normally. The beams are fed from the rear of the bridge-erecting machine by the beam transport vehicle to start the erection of this span. Fig.10 Schematic diagram of the gun carriage feeding beam.

[0042] (9) When the small radius side beam is erected, when the position of the bridge erecting machine is adjusted to erect the side beam, the track at the middle leg position of the bridge erecting machine is often in a cantilever state, which is not conducive to the stress on the middle leg track. By optimizing the leg and track structure according to the erection state of the small radius side beam of each span, and verifying the lateral anti-overturning stability of the bridge erecting machine and the stress on the middle leg during the side beam erection construction, the cantilever erection of the side beam is realized. Fig.11 Schematic diagram of optimized track and outrigger installation for side beams.

[0043] The corresponding advantageous effects of the present invention are as follows: (1) the posture adjustment of the bridge erection machine under ultra-small radius is realized through the adaptive rotating front outrigger, middle outrigger and parallel connection; (2) the outrigger and track structure is optimized to realize the cantilever erection of the side beam; the main beam walking type front outrigger structure is adopted to realize the forward movement of the main beam, thereby ensuring the smooth feeding of the prefabricated beam under ultra-small radius; (3) for the design route of the ultra-small radius curved bridge, the posture simulation of the full-span walking and beam erection of the bridge erection machine is carried out, and the point control is carried out on site according to the simulation results, so that the posture of the bridge erection machine in the whole process of turning, crossing the span and erecting the beam can be controlled, thereby ensuring the safety and reliability of the beam erection process.

[0044] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for erecting a bridge erecting machine for an ultra-small radius curved beam bridge, characterized in that: Through the adaptive rotating front outrigger, middle outrigger and flat joint, the maximum lateral displacement of the front outrigger is 57cm, the rotation angle is 2°, and the front outrigger and its track are staggered by 15cm in the longitudinal direction of the bridge; at the same time, the spacing adjustment of the main beam of the bridge erector on the wheel box of the middle outrigger is ±5cm, and the maximum lateral displacement of the front outrigger is 253cm, and the rotation angle is 8°; the flat joint adopts an articulated form and can adaptively rotate during the steering process of the bridge erector; the alternating adaptive rotation of the front outrigger and the middle outrigger and the flat joint articulated connection realize the posture adjustment of the bridge erector under ultra-small radius; Optimize the outrigger and track structure. During the erection of the side beam, the track at the middle outrigger is in a cantilever state. According to the posture simulation of the bridge erection machine during the erection of the side beam, the lateral anti-overturning stability and the safety of the middle outrigger structure are verified. At the same time, due to the limited bearing capacity of the small T-beam flange, support steel is placed under the flange plate to achieve the cantilever erection of the ultra-small radius lower side beam; The main beam walking type front outrigger structure is adopted. If the beam cannot be fed normally, the main beam will move forward to ensure that the rear outrigger is on the T-beam and the beam transport carriage can feed the beam normally from the tail of the bridge-erecting machine, thereby ensuring the smooth feeding of prefabricated beams under ultra-small radius. The walking trajectory of the beam transport carriage is simulated based on the on-site conditions to determine the wheel track and the position of the steel plate laying. At the same time, for the design route of the ultra-small radius curved bridge, the posture simulation of the full-span walking and beam erection of the bridge-erecting machine is carried out, and the point control is carried out on-site according to the simulation results, so that the posture of the bridge-erecting machine in the whole process of turning, crossing the span and erecting the beams can be controlled, ensuring the safety and reliability of the beam erection process.

2. According to the method for erecting a bridge erector for an ultra-small radius curved beam bridge according to claim 1, it is characterized in that The specific construction process is as follows: (1) Move the bridge erector along the track to the center of the bridge deck, move the front outrigger 0.57 m to the inside of the turn, move the main beam 1 forward 15 cm, and rotate the bridge erector 2° along the inside. At this time, the front outrigger and the middle outrigger are under stress, while the counter bracket and the rear outrigger are not under stress; (2) The crane moves to between the middle outrigger and the rear outrigger, uses the middle outrigger as a fulcrum, uses the crane steel rope to hold the beam counterweight, retracts the steel rope to lift the front outrigger, adjusts the front outrigger track, and returns the angle between the front outrigger and the truss to the initial state. Then, loosen the crane lifting rope to allow the front outrigger to touch the ground, and then rotate again; (3) Repeat steps (1) and (2) three times, the main beam rotates 8°, the front outrigger moves 253 cm laterally, the distance between the main beam of the bridge crane and the wheel box on the middle outrigger reaches the limit of 5 cm, and the main beam posture remains unchanged during the turning process; (4) Use the front outrigger and the counter bracket to lift the middle outrigger off the beam surface, use the overhead crane to adjust the middle outrigger track so that the track is parallel to the front outrigger, and lower the main beam onto the middle outrigger supporting wheel again to achieve the re-rotation of the bridge erecting machine; (5) Repeat steps (1) to (4) until the front legs of the bridge erector can fall onto the next span cap beam after passing through the hole; after reaching the predetermined position, the front legs and the counter-bracket are subjected to force, the middle legs are moved to the position of 1m from the front legs, and then the middle legs and the rear legs are lifted up, and the counter-bracket is moved to the appropriate position in the middle front; (6) Use the overhead crane to hold the beam and start passing the hole. At this time, the front and rear legs are off the ground, the middle legs and the counter-bracket are under force, and the overhead crane holds the erected beam and remains relatively still with the middle legs during the span-passing process to prevent the bridge erector from overturning until the front legs of the bridge erector are through the hole and placed on the cap beam of the next span; (7) After the bridge erection machine has passed through the hole, the front outrigger falls on the next span cap beam, and steps (1) to (4) are repeated. The bridge erection machine is rotated 12°, and the front outrigger track is adjusted to be parallel to the middle outrigger track. The rear outrigger is padded with square wood to prepare for beam erection. (8) The bridge erection machine is adjusted in place and the beams are fed according to the on-site transportation conditions. If the beams cannot be fed normally, the main beam needs to be moved forward to ensure that the rear legs are on the T-beam and can be fed normally. The beams are fed from the tail of the bridge erection machine by the beam transport vehicle to start the erection of this span; (9) When the small radius side beam is erected, when the position of the bridge erecting machine is adjusted to erect the side beam, the track at the middle leg position of the bridge erecting machine is often in a cantilever state, which is not conducive to the stress on the middle leg track. By optimizing the leg and track structure according to the erection state of the small radius side beam of each span, and verifying the lateral anti-overturning stability of the bridge erecting machine and the stress on the middle leg during the side beam erection construction, the cantilever erection of the side beam is realized.

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