Control method for front guide beam of bridge erecting machine

Abstract

A control method of a front guide beam of a bridge girder erection machine, the front guide beam is provided with an upper guide rail and a lower beam from top to bottom; a plurality of support bases are arranged on the lower beam, the support bases walk along the lower beam to correspond to the positions of bridge piers; the control method comprises the following steps: the second supporting leg is lifted, the front guide beam is moved transversely to the position between two bridge piers by driving the beam moving driving wheel; the support bases are moved along the front guide beam to align the support bases with the positions of the bridge piers; the through hole on the base body is aligned with the reserved longitudinal reinforcement; the second supporting leg is lowered to make the bottom of the base body contact with the top of the bridge pier, the locking device is loosened to make the supporting column freely fall, the bottom of the supporting column contacts with the top of the bridge pier; the locking device is started to lock the supporting column. The present application can accurately align the support bases with the bridge piers in transverse and longitudinal directions, accurately pass the reserved longitudinal reinforcement into the through hole reserved on the support base, and reliably support on the top of the bridge pier through a plurality of liftable and lockable supporting columns.

Description

Technical Field

[0001] This invention relates to the field of bridge construction equipment, and in particular to a control method for the front guide beam of a bridge erecting machine. Background Technology

[0002] Bridge erecting machines used in non-ground-based bridge construction methods have a leading crossbeam on their front outriggers. The cap beam is a prefabricated structure, requiring the leading crossbeam to support the top of the piers to provide support for the machine. However, the top of the piers has multiple pre-reserved longitudinal reinforcement bars, making it difficult to ensure reliable support for the leading crossbeam. In particular, due to changes in the urban environment, pier spacing can vary, making it challenging to drill holes in the leading crossbeam to accommodate the pre-reserved longitudinal reinforcement bars. In non-ground-based bridge construction, the machine also needs to move laterally along the bridge, and the outriggers need to move the leading crossbeam to the next pier. Furthermore, the machine's weight is significant, requiring sufficient contact area between the leading crossbeam and the pier. Therefore, the structural design and construction control of the leading crossbeam are quite challenging. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a control method for the front guide beam of a bridge erecting machine, which can move together with the outriggers, can be supported on the top of the pier, and can move laterally autonomously to adapt to the spacing changes between different piers, and can be supported on the top of the pier without being affected by the position of the reserved longitudinal reinforcement.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a control method for the front guide beam of a bridge erecting machine, wherein the front guide beam is provided with an upper guide rail and a lower crossbeam from top to bottom;

[0005] Multiple support bases are provided on the lower crossbeam, and the support bases move along the lower crossbeam to correspond to the position of the bridge pier;

[0006] Grooves are provided on both sides of the upper guide rail, and the lateral travel wheel set of the second leg is provided with two opposing beam-moving drive wheels, which are located in the grooves.

[0007] The distance between the traveling wheels of the transverse traveling wheel set and the beam-moving drive wheel is set such that when the second leg of the bridge erecting machine is lowered to the upper guide rail support, the traveling wheels contact the top surface of the upper guide rail, the beam-moving drive wheel does not contact the groove, and the traveling wheels move laterally along the upper guide rail.

[0008] When the second leg is lifted, the wheel surface of the traveling wheel disengages from the top surface of the upper guide rail, the beam-shifting drive wheel contacts the groove of the upper guide rail, and the beam-shifting drive wheel drives the front guide beam to move laterally.

[0009] Multiple through holes are provided at the bottom of the base body to allow the reserved longitudinal reinforcement at the top of the pier to pass through;

[0010] It is also equipped with multiple support columns, which are installed on the first and second horizontal plates of the base body with adjustable height, and the bottom of the support column contacts the top of the pier.

[0011] It is also equipped with a locking device for locking the support column;

[0012] The control method includes the following steps:

[0013] S1. The second leg is raised, so that the front guide beam is suspended in the air. According to the position of the pier, the beam-moving drive wheel is driven to move the front guide beam laterally to the position between the two piers.

[0014] S2. The base travel motor drives the support base to move along the front guide beam, so that the support base is aligned with the position of the bridge pier.

[0015] S3. Fine-tune the position of the support base so that the through hole on the base body is aligned with the reserved longitudinal rib;

[0016] S4. The second leg falls down, bringing the bottom of the base close to the top of the pier. The locking device is released, allowing the support column to fall freely, with the bottom of the support column contacting the top of the pier.

[0017] S5. Activate the locking device to lock the support column;

[0018] Through the above steps, the leading crossbeam provides reliable support for the second leg.

[0019] In the preferred embodiment, in the lateral travel wheel assembly, the travel motor is connected to the travel wheel through a travel transmission mechanism, and the wheel surface of the travel wheel contacts the top surface of the upper guide rail;

[0020] The beam-moving motor is connected to the beam-moving drive wheel, which is connected to the beam-moving driven wheel through the beam-moving transmission mechanism. The beam-moving driven wheel is connected to the beam-moving drive wheel.

[0021] In a preferred embodiment, a brake plate is provided in the base body of the support base. The distance between the brake plate and the base travel wheel is set such that when the second leg is raised, the brake plate does not contact the bottom surface of the lower crossbeam; the base travel wheel contacts the groove of the lower crossbeam, and the base travel motor can drive the support base to travel along the front guide crossbeam.

[0022] When the second leg is lowered, the base travel wheel disengages from the groove of the lower crossbeam, the brake plate contacts the bottom surface of the lower crossbeam, and prevents displacement between the support base and the lower crossbeam.

[0023] In a preferred embodiment, the locking device has the following structure: a support column passes vertically through the first horizontal plate and the second horizontal plate; a wedge is provided in the inclined groove on the first horizontal plate; the top section of the wedge is larger than the bottom section of the wedge; the top of the wedge is connected to the transmission plate through a transmission rod; and the transmission plate is connected to the lifting mechanism.

[0024] One side of the wedge is an inclined surface, used to abut against the inclined groove; the other side of the wedge is an arc-shaped or V-shaped surface, used to abut against the cylindrical surface of the support column.

[0025] In step S4, after the bottom of the base body contacts the top of the pier, the base body is raised a preset distance, the transmission rod of the base body retracts, and the locking device is released.

[0026] In a preferred embodiment, a guide bearing is fixedly mounted on the second horizontal plate, and the guide bearing is slidably connected to the support column.

[0027] In the preferred embodiment, when the support base is placed on top of the pier, the lifting mechanism retracts, the wedge falls and disengages from the support column, the support column falls freely and contacts the top of the pier; the lifting mechanism extends, the wedge rises, and locks the support column, thereby adapting to the shape of the top of the pier.

[0028] In a preferred embodiment, a retractable detection rod is provided at the bottom of the base body, with the end of the detection rod extending a certain distance beyond the bottom surface of the base body. When the detection rod retracts, it triggers a limit switch.

[0029] In step S4, after the end of the detection rod contacts the top of the pier, the detection rod triggers the limit switch, and the second leg stops falling.

[0030] In a preferred embodiment, the lifting mechanism is an electric push rod.

[0031] In the preferred embodiment, cameras for auxiliary alignment are provided near both ends of the lower crossbeam, and marking lines corresponding to the positions of the through holes are provided on the outer wall of the base body. The camera's field of view can see at least the marking lines and reserved longitudinal ribs on two adjacent outer walls of the base body.

[0032] In step S3, based on the image feedback from the camera, the position of the second leg is first adjusted so that the marking line on the side wall of the base body is aligned with the corresponding reserved longitudinal rib.

[0033] Adjust the position of the base body so that the marking line on the front or rear wall of the base body is aligned with the corresponding reserved longitudinal rib;

[0034] This achieves alignment between the through hole and the end of the reserved longitudinal reinforcement.

[0035] This is used to align the through holes on the base body with the reserved longitudinal ribs.

[0036] In a preferred embodiment, an internal camera is provided above at least one through hole within the base body;

[0037] After the bridge pier construction is completed, the ends of the reserved longitudinal bars need to be corrected so that the end positions of each reserved longitudinal bar correspond to the through holes of the base body.

[0038] In step S3, based on the feedback from the internal camera, the position of the second leg is first adjusted so that the through hole is aligned with the end of the corresponding reserved longitudinal rib.

[0039] Adjust the position of the base body so that the through hole is aligned with the end of the corresponding reserved longitudinal rib.

[0040] This invention provides a control method for the front guide beam of a bridge erecting machine. The controlled front guide beam can move forward to the pier along with the second leg, and can adjust the support base to precisely align with the pier laterally and longitudinally. This allows the pre-reserved longitudinal reinforcement bars to be precisely inserted into the pre-reserved through holes in the support base. Multiple liftable and lockable support columns reliably support the machine on the pier top, ensuring reliable force distribution and preventing interference from unevenness on the pier top. This method enables the bridge erecting machine to reliably support the entire machine by resting the front guide beam on the top of the pier without a cap beam during non-grounded bridge erection, ensuring the smooth implementation of the non-grounded bridge erection process. Attached Figure Description

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0042] Figure 1 This is a flowchart of the present invention.

[0043] Figure 2 This is the main view of the overall structure of the present invention.

[0044] Figure 3 This is a schematic diagram illustrating the application of the present invention in the process of bridge construction without touching the ground.

[0045] Figure 4 This is a cross-sectional schematic diagram of the second leg of the present invention when it is suspended in the air.

[0046] Figure 5 This is a cross-sectional schematic diagram of the second leg of the present invention when it is in the position of landing.

[0047] Figure 6 yes Figure 5 BB cross-sectional view.

[0048] Figure 7 yes Figure 5 AA sectional view.

[0049] Figure 8 yes Figure 7 CC section view.

[0050] In the diagram, the first leg is 1, the reserved longitudinal rib is 2, the second leg is 3, the front guide beam is 4, the lower beam is 401, the support base is 402, the upper guide rail is 403, the safety hook is 404, the lateral travel wheel set is 405, the beam drive seat plate is 406, the beam moving drive wheel is 407, the beam moving transmission mechanism is 408, the beam moving driven wheel is 409, the beam moving drive wheel is 410, the travel motor is 411, the travel transmission mechanism is 412, the travel wheel is 413, the brake plate is 414, the base travel wheel is 415, the base travel transmission mechanism is 416, and the base travel wheel is 415. Motor 417, base 418, support column 419, wedge block 420, guide bearing 421, transmission plate 422, transmission rod 423, lifting mechanism 424, first horizontal plate 425, second horizontal plate 426, beam moving motor 427, inclined groove 428, detection rod 429, limit switch 430, first spring 431, second spring 432, bridge erecting machine main beam 5, bridge pier 6, cap beam 7, third leg 8, lifting trolley 9, fourth leg 10, box girder 11, camera 12, internal camera 13. Detailed Implementation

[0051] like Figures 1-8 In the present invention, a control method for the front guide beam of a bridge erecting machine is provided, wherein the front guide beam 4 is provided with an upper guide rail 403 and a lower crossbeam 401 from top to bottom;

[0052] like Figures 4-6 In the middle, multiple support bases 402 are provided on the lower crossbeam 401. The support bases 402 move along the lower crossbeam 401 to correspond to the position of the pier 6.

[0053] like Figure 6 In the middle, grooves are provided on both sides of the upper guide rail 403, and the transverse travel wheel group 405 of the second support leg 3 is provided with two opposing beam-moving drive wheels 410, which are located in the grooves.

[0054] Preferred solutions include Figure 6 In the transverse traveling wheel assembly 405, the traveling motor 411 is connected to the traveling wheel 413 through the traveling transmission mechanism 412, and the wheel surface of the traveling wheel 413 contacts the top surface of the upper guide rail 403. In this example, the traveling transmission mechanism 412 adopts a gear transmission mechanism, but a gearbox and chain transmission mechanism can also be used as needed.

[0055] The beam-moving motor 427 is connected to the beam-moving drive wheel 407, which is connected to the beam-moving driven wheel 409 via the beam-moving transmission mechanism 408. The beam-moving driven wheel 409 is connected to the beam-moving drive wheel 410.

[0056] like Figure 6In the middle, the distance between the traveling wheel 413 of the transverse traveling wheel set 405 and the beam shifting drive wheel 410 is set such that when the second leg 3 of the bridge erecting machine is lowered to the upper guide rail 403 support, the traveling wheel 413 contacts the top surface of the upper guide rail 403, the beam shifting drive wheel 410 does not contact the groove, and the traveling wheel 413 moves laterally along the upper guide rail 403.

[0057] When the second leg 3 is lifted, the wheel surface of the traveling wheel 413 disengages from the top surface of the upper guide rail 403, the beam-moving drive wheel 410 contacts the groove of the upper guide rail 403, and the beam-moving drive wheel 410 drives the front guide beam 4 to move laterally.

[0058] like Figure 6 , 7 In the middle, multiple through holes are provided at the bottom of the base body 418 so that the reserved longitudinal reinforcement 2 at the top of the pier 6 can pass through;

[0059] like Figures 6-8 In the middle, there are also multiple support columns 419. The support columns 419 are installed on the first horizontal plate 425 and the second horizontal plate 426 of the base body 418 with adjustable height. The bottom of the support column 419 is in contact with the top of the pier 6.

[0060] It is also equipped with a locking device for locking the support column 419;

[0061] The control method includes the following steps:

[0062] S1. The second support leg 3 is raised. Multiple hydraulic cylinders are installed on the second support leg 3 to control its extension and retraction. The structure and control method of the second support leg 3 fall within the scope of existing technology. Raising the second support leg 3 suspends the front guide beam 4 in the air. Depending on the location of the pier 6, since non-grounded bridge construction is typically used for existing roads or even existing elevated structures, the location of the pier 6 needs to be designed according to local conditions from a top-down perspective. This often results in an uncertain location for the pier 6, especially at elevated joints, where one pier may be far from the bridge deck while another is close. The beam-moving motor 427 drives the beam-moving drive wheel 410 to move the front guide beam 4 laterally between the two piers 6, so that both ends of the front guide beam 4 can rest on the top of the pier 6. Figure 4 As shown in the image.

[0063] S2, the base travel motor 417 drives the support base 402 to move along the front guide beam 4, so that the support base 402 is aligned with the position of the pier 6; such as Figure 4 As shown in the image.

[0064] S3. Fine-tune the position of the support base 402 so that the through hole on the base body 418 is aligned with the reserved longitudinal rib 2; Figure 4 As shown in the image.

[0065] S4. The second leg 3 descends, bringing the bottom of the base 418 close to the top of the pier 6, as... Figure 5 As shown, the locking device is released, allowing the support column 419 to fall freely, with the bottom of the support column 419 contacting the top of the pier 6; as Figures 5-8 As shown in the image.

[0066] S5. Activate the locking device to lock the support column 419; Figure 7 As shown in the image.

[0067] Through the above steps, the leading crossbeam provides reliable support for the second leg 3.

[0068] Example 2:

[0069] Preferred solutions include Figure 6 In the support base 402, a brake plate 414 is provided in the base body 418. The distance between the brake plate 414 and the base travel wheel 415 is set such that when the second support leg 3 is lifted, the brake plate 414 does not contact the bottom surface of the lower crossbeam 401; the base travel wheel 415 contacts the groove of the lower crossbeam 401, and the base travel motor 417 can drive the support base 402 to travel along the front guide crossbeam 4.

[0070] When the second leg 3 is lowered, the base travel wheel 415 disengages from the groove of the lower crossbeam 401. This disengagement refers to the wheel surface of the base travel wheel 415 separating from the bottom wall of the groove. The brake plate 414 contacts the bottom surface of the lower crossbeam 401, preventing displacement between the support base 402 and the lower crossbeam 401. This structure ensures that the support base 402 is reliably fixed to the lower crossbeam 401 of the front guide beam 4, ensuring construction safety. The advantage of this structure also lies in its simplicity and high reliability; even in the event of misoperation, the base travel wheel 415 cannot drive the support base to move.

[0071] Example 3:

[0072] Preferred solutions include Figures 6-8 In the above, the locking device has the following structure: a support column 419 vertically passes through the first horizontal plate 425 and the second horizontal plate 426. A wedge 420 is provided in the inclined groove 428 on the first horizontal plate 425. The top section of the wedge 420 is larger than the bottom section of the wedge 420. The top of the wedge 420 is connected to the transmission plate 422 through the transmission rod 423. The transmission plate 422 is connected to the lifting mechanism 424.

[0073] One side of the wedge 420 is an inclined surface used to abut against the inclined groove 428; the other side of the wedge 420 is an arc-shaped or V-shaped surface used to abut against the cylindrical surface of the support column 419. With this structure, when the wedge 420 abuts against the support column 419, and when the support column 419 is under force, the wedge 420 will become increasingly tighter under pressure. When the second leg 3 is raised and the support column 419 is relieved of force, the wedge 420 only requires a small driving force to release the support column 419. In the initial state, the support columns 419 are in a free-falling state until the bottom of the support column 419 contacts the top of the pier 6, thus being lifted by the top of the pier 6. Due to construction errors and roughening, the flatness error of the top of the pier 6 is relatively large. If the support base is placed directly on the pier, without considering the interference of the reserved longitudinal reinforcement 2, the localized stress on the support base may cause damage to the support base, and in severe cases, may cause the bridge erecting machine to overturn. The use of a multi-support column 419 structure ensures uniform stress distribution on the support base, thus ensuring construction safety.

[0074] In step S4, after the bottom of the base 418 contacts the top of the pier 6, the base 418 is raised a preset distance, the transmission rod 423 of the base 418 retracts, and the locking device is released. The height raised is 1-2 cm. The purpose of this operation is to allow each support column 419 to extend a certain distance, thereby supporting the base 418 with the support columns 419, and thus reliably supporting the front guide beam 4. The base 418 does not contact the top of the pier 6.

[0075] Preferred solutions include Figure 7 In the middle, a guide bearing 421 is fixed on the second horizontal plate 426, and the guide bearing 421 is slidably connected to the support column 419.

[0076] In the preferred embodiment, the lifting mechanism 424 is an electric push rod. The electric push rod is a commercially available product; the specific model and thrust are determined based on the thrust required for the wedge 420 to disengage.

[0077] Preferred solutions include Figure 7 When the support base 402 rests on top of the pier 6, the lifting mechanism 424 retracts (in this example, an electric push rod retracts), the transmission plate 422 falls, and the transmission plate 422 connects to the transmission rod 423. The transmission rod 423 drives the wedge block 420 to fall synchronously, the wedge block 420 disengages from the support column 419, and the support column 419 falls freely under gravity, contacting the top of the pier 6; the lifting mechanism 424 extends (in this example, an electric push rod extends), and the wedge block 420 rises under the drive of the transmission plate 422 and the transmission rod 423, locking the support column 419 to conform to the shape of the top of the pier 6. The wedge block 420 does not require a large pushing force to lock the support column 419; as the support column 419 is subjected to force, the wedge block 420 will lock the support column 419 tighter and tighter.

[0078] Example 4:

[0079] Unlike the method in Example 3 that relies on operator observation, the preferred solution is as follows: Figure 7 In this design, a retractable detection rod 429 is provided at the bottom of the base 418. In this example, the detection rod 429 is mounted on the outer wall of the base 418, and the vertical detection rod 429 is slidably connected to a sliding seat fixed to the outer wall of the base 418 for easy maintenance. The retractable detection rod 429 refers to the presence of a first spring 431 and a second spring 432 near both ends of the detection rod 429, where the elastic force of the first spring 431 is greater than that of the second spring 432, to ensure that the detection rod 429 always tends to extend. The use of a double-spring design reduces the mechanical impact on the detection rod 429 and improves its service life. The end of the detection rod 429 extends a certain distance from the bottom surface of the base 418, for example, 1-2 cm. When the detection rod retracts, it triggers the limit switch 430. In this example, the triggering includes direct contact mechanical triggering, such as the triggering method of a mechanical limit switch, and non-contact triggering, such as the triggering method based on a giant magnetoresistive limit switch.

[0080] In step S4, after the end of the detection rod contacts the top of the pier 6, the detection rod 429 triggers the limit switch 430, and the second leg 3 stops falling. This structure prevents the base 418 from directly contacting the top of the pier 6.

[0081] Example 5:

[0082] Preferred solutions include Figures 4-5 In the middle, a camera 12 for auxiliary alignment is provided near both ends of the lower crossbeam 401, and a marking line corresponding to the position of the through hole is provided on the outer wall of the base body 418. The field of view of the camera 12 can see at least the marking line and the reserved longitudinal rib 2 of two adjacent outer walls of the base body 418.

[0083] In step S3, based on the image feedback from camera 12, the position of the second leg 3 is first adjusted so that the marking line on the side wall of the base body 418 is aligned with the corresponding reserved longitudinal rib 2.

[0084] Adjust the position of the base 418 so that the marking line on the front or rear wall of the base 418 is aligned with the corresponding reserved longitudinal rib 2.

[0085] This achieves alignment between the through hole and the end of the reserved longitudinal reinforcement 2. This structure ensures alignment without requiring operators to approach and observe from a height, thus enhancing construction safety.

[0086] The through holes on the auxiliary base 418 are aligned with the reserved longitudinal ribs 2.

[0087] Example 6:

[0088] Preferred solutions include Figure 6 In the base body 418, an internal camera 13 is provided above at least one through hole;

[0089] After the construction of pier 6 is completed, the ends of the reserved longitudinal reinforcement 2 need to be corrected so that the position of the end of each reserved longitudinal reinforcement 2 corresponds to the through hole of the base body 418. The correction mainly corrects the spacing between the ends of the reserved longitudinal reinforcement 2 to correspond to the spacing between the through holes.

[0090] In step S3, based on the feedback from the internal camera 13, the position of the second leg 3 is first adjusted so that the through hole is aligned with the end of the corresponding reserved longitudinal rib 2.

[0091] Adjust the position of the base 418 so that the through hole aligns with the end of the corresponding reserved longitudinal rib 2. This embodiment can be combined with the solution of embodiment 5 for better results.

[0092] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely illustrative descriptions of the application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of the claims and their equivalents, this application is also intended to include such modifications and modifications.

Claims

1. A control method for the front guide beam of a bridge erecting machine, characterized in that: The front crossbeam (4) has an upper guide rail (403) and a lower crossbeam (401) from top to bottom; Multiple support bases (402) are provided on the lower crossbeam (401). The support bases (402) move along the lower crossbeam (401) to correspond to the position of the pier (6). Grooves are provided on both sides of the upper guide rail (403), and the transverse travel wheel set (405) of the second leg (3) is provided with two opposing beam-moving drive wheels (410), which are located in the grooves; The distance between the traveling wheel (413) of the transverse traveling wheel set (405) and the beam shifting drive wheel (410) is set such that when the second leg (3) of the bridge erecting machine is lowered to the upper guide rail (403) for support, the traveling wheel (413) contacts the top surface of the upper guide rail (403), the beam shifting drive wheel (410) does not contact the groove, and the traveling wheel (413) moves laterally along the upper guide rail (403); When the second leg (3) is lifted, the wheel surface of the walking wheel (413) disengages from the top surface of the upper guide rail (403), the beam-moving drive wheel (410) contacts the groove of the upper guide rail (403), and the beam-moving drive wheel (410) drives the front guide beam (4) to move laterally. Multiple through holes are provided at the bottom of the base body (418) for the reserved longitudinal reinforcement (2) at the top of the pier (6) to pass through; Multiple support columns (419) are also provided. The support columns (419) are installed on the first horizontal plate (425) and the second horizontal plate (426) of the base body (418) with adjustable height. The bottom of the support column (419) is in contact with the top of the pier (6). It is also equipped with a locking device for locking the support column (419); The control method includes the following steps: S1. The second leg (3) is raised, so that the front guide beam (4) is suspended in the air. According to the position of the pier (6), the beam moving drive wheel (410) is driven to move the front guide beam (4) laterally to the position between the two piers (6). S2, The base walking motor (417) drives the support base (402) to move along the front guide beam (4) so ​​that the support base (402) is aligned with the position of the pier (6); S3. Fine-tune the position of the support base (402) so that the through hole on the base body (418) is aligned with the reserved longitudinal rib (2); S4. The second leg (3) falls down, bringing the bottom of the base (418) close to the top of the pier (6), releasing the locking device, allowing the support column (419) to fall freely, and the bottom of the support column (419) to contact the top of the pier (6). S5. Activate the locking device to lock the support column (419); Through the above steps, the leading crossbeam provides reliable support for the second leg (3).

2. The control method for the front guide beam of the bridge erecting machine according to claim 1, characterized in that: In the transverse traveling wheel assembly (405), the traveling motor (411) is connected to the traveling wheel (413) through the traveling transmission mechanism (412), and the wheel surface of the traveling wheel (413) contacts the top surface of the upper guide rail (403); The beam-moving motor (427) is connected to the beam-moving drive wheel (407), the beam-moving drive wheel (407) is connected to the beam-moving driven wheel (409) through the beam-moving transmission mechanism (408), and the beam-moving driven wheel (409) is connected to the beam-moving drive wheel (410).

3. The control method for the front guide beam of the bridge erecting machine according to claim 1, characterized in that: A brake plate (414) is provided in the base body (418) of the support base (402). The distance between the brake plate (414) and the base travel wheel (415) is set such that when the second leg (3) is lifted, the brake plate (414) does not contact the bottom surface of the lower crossbeam (401); the base travel wheel (415) contacts the groove of the lower crossbeam (401), and the base travel motor (417) can drive the support base (402) to travel along the front guide crossbeam (4). When the second leg (3) is lowered, the base travel wheel (415) disengages from the groove of the lower crossbeam (401), the brake plate (414) contacts the bottom surface of the lower crossbeam (401), and prevents displacement between the support base (402) and the lower crossbeam (401).

4. The control method for the front guide beam of the bridge erecting machine according to claim 1, characterized in that: The locking device has the following structure: a support column (419) passes vertically through the first horizontal plate (425) and the second horizontal plate (426). A wedge (420) is provided in the inclined groove (428) on the first horizontal plate (425). The top section of the wedge (420) is larger than the bottom section of the wedge (420). The top of the wedge (420) is connected to the transmission plate (422) through the transmission rod (423). The transmission plate (422) is connected to the lifting mechanism (424). One side of the wedge (420) is an inclined surface, which is used to abut against the inclined groove (428); the other side of the wedge (420) is an arc-shaped surface or a V-shaped surface, which is used to abut against the cylindrical surface of the support column (419); In step S4, after the bottom of the base (418) contacts the top of the pier (6), the base (418) is raised a preset distance, the transmission rod (423) of the base (418) retracts, and the locking device is released.

5. The control method for the front guide beam of the bridge erecting machine according to claim 4, characterized in that: A guide bearing (421) is fixed on the second horizontal plate (426), and the guide bearing (421) is slidably connected to the support column (419).

6. The control method for the front guide beam of the bridge erecting machine according to claim 4, characterized in that: When the support base (402) is placed on top of the pier (6), the lifting mechanism (424) retracts, the wedge (420) falls and disengages from the support column (419), the support column (419) falls freely and contacts the top of the pier (6); the lifting mechanism (424) extends, the wedge (420) rises and locks the support column (419), thereby adapting to the top shape of the pier (6).

7. The control method for the front guide beam of the bridge erecting machine according to claim 4, characterized in that: A retractable detection rod (429) is provided at the bottom of the base body (418). The end of the detection rod (429) extends a certain distance from the bottom surface of the base body (418). After the detection rod retracts, it triggers the limit switch (430). In step S4, after the end of the detection rod contacts the top of the pier (6), the detection rod (429) triggers the limit switch (430), and the second leg (3) stops falling.

8. The control method for the front guide beam of the bridge erecting machine according to claim 7, characterized in that: The lifting mechanism (424) is an electric push rod.

9. The control method for the front guide beam of the bridge erecting machine according to claim 1, characterized in that: A camera (12) for auxiliary alignment is provided near both ends of the lower crossbeam (401). A marking line corresponding to the position of the through hole is provided on the outer wall of the base body (418). The field of view of the camera (12) can see at least the marking line and the reserved longitudinal rib (2) on two adjacent outer walls of the base body (418). In step S3, based on the image feedback from the camera (12), the position of the second leg (3) is first adjusted so that the marking line on the side wall of the base body (418) is aligned with the corresponding reserved longitudinal rib (2); Adjust the position of the base body (418) so that the marking line on the front or rear wall of the base body (418) is aligned with the corresponding reserved longitudinal rib (2); This achieves alignment between the through hole and the end of the reserved longitudinal reinforcement (2).

10. The control method for the front guide beam of the bridge erecting machine according to claim 1, characterized in that: An internal camera (13) is provided above at least one through hole inside the base body (418). After the pier (6) is completed, the ends of the reserved longitudinal bars (2) need to be corrected so that the end positions of each reserved longitudinal bar (2) correspond to each through hole of the base body (418). In step S3, based on the feedback from the internal camera (13), the position of the second leg (3) is first adjusted so that the through hole is aligned with the end of the corresponding reserved longitudinal rib (2); Adjust the position of the base body (418) so that the through hole is aligned with the end of the corresponding reserved longitudinal rib (2).

Images