A bridge erecting machine for road and bridge erection construction

Abstract

The present invention relates to the technical field of bridge erection machine construction, and specifically to a bridge erection machine for road and bridge erection construction, comprising a machine arm, a front leg assembly, a middle leg assembly, a rear leg assembly and a hoisting crane, a sliding platform, a gantry and a self-locking leg, the self-locking leg comprising a fixed column, a movable frame and a linear drive, a base contacting a pier is arranged at the bottom of the movable frame, an inner cavity is arranged in the base, a positioning bayonet is arranged at the bottom of the base, a movable pressure plate is slidably installed in the inner cavity in the base, a positioning sleeve is arranged below the movable pressure plate, side through holes are arranged on the side wall of the positioning sleeve, through holes with the same positions as the side through holes are arranged on the installation well of the pier, and positioning blocks with the same number as the side through holes are slidably installed in the positioning sleeve, the present invention drives the movable frame and the fixed column to move relative to each other through the linear drive, so that the self-locking leg has a suitable length, and the positioning bayonet at the bottom of the base cooperates with the installation well and the positioning block on the pier to lock the position of the self-locking leg.

Description

Technical Field

[0001] The invention relates to the technical field of bridge erection machine construction, in particular to a bridge erection machine for road and bridge erection construction. Background Art

[0002] The bridge erection machine is a device that places the prefabricated beams on the prefabricated bridge piers. It includes a machine arm, a front auxiliary outrigger assembly, a front outrigger assembly, a middle outrigger assembly, a rear outrigger assembly, a front carriage, and a rear carriage. The machine arm can be driven forward by the front outrigger assembly and the middle outrigger assembly until the front outrigger assembly can be supported on the next bridge pier, and the middle outrigger assembly is supported on the bridge deck, and then the front carriage and the rear carriage are used to transport the beams, and the two ends of the beams are connected to the previous bridge pier and the next bridge pier respectively.

[0003] Since there may be a longitudinal height difference between two adjacent piers, the supporting legs are usually retractable, and workers are required to install pins on the two fixed-length supporting legs to lock the length of the supporting legs. However, there is a gap between the positioning holes for installing the pins. Therefore, once the positioning holes of the two supporting legs cannot be aligned, the pins cannot be installed. In addition, the installation and removal of the pins are very difficult, requiring a lot of manpower, which affects the efficiency of the bridge erection process. Summary of the invention

[0004] In view of the above problems, it is necessary to provide a bridge erection machine for road and bridge erection construction in view of the existing technical problems.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] A bridge erection machine for road and bridge erection construction comprises a machine arm, a front leg assembly, a middle leg assembly, a rear leg assembly and a hoisting crane, wherein the front leg assembly and the rear leg assembly each comprise a slide slidably connected to the machine arm, and a gantry horizontally mounted on the slide, self-locking legs are arranged at both ends of the gantry, the self-locking legs comprise at least two fixed columns extending vertically downward, a movable frame sleeved outside the fixed columns, and a linear drive driving the movable frame to move vertically, the linear drive being fixedly mounted on the gantry; a base contacting a pier is arranged at the bottom of the movable frame, an inner cavity is arranged in the base, and a mounting well-shaped portion is arranged at the bottom of the base in contact with the pier The movable frame is provided with a positioning bayonet of the same shape, and the linear drive drives the movable frame to move downward, and the positioning bayonet is sleeved on the outside of the installation well on the pier; a movable pressure plate is slidably installed in the inner cavity inside the base, and a positioning sleeve with the same shape as the installation well is arranged below the movable pressure plate, the positioning sleeve is located inside the installation well, and the side wall of the positioning sleeve is provided with at least one side through hole horizontally penetrating the positioning sleeve, and the installation well of the pier is provided with through holes with the same positions as the side through holes, and positioning blocks with the same number as the side through holes are slidably installed in the positioning sleeve, and the width of the positioning blocks is the same as the width of the side through holes, and the positioning blocks are inserted in the through holes of the side through holes and the installation well to lock the position of the base on the pier.

[0007] Preferably, a pendant block is provided in the positioning sleeve, and a first limit block is provided on the top of the pendant block. The first limit block is slidably installed in an inner cylinder provided in the positioning sleeve, and the axis of the inner cylinder is vertically arranged; a first conical surface which gradually decreases in the inner diameter direction is provided on the upper side of the pendant block, and the first conical surface is located below the positioning block, and the pendant block protrudes from the bottom opening of the positioning sleeve; a top column is provided at the bottom of the positioning block, and the top column fits the first conical surface of the pendant block, and a second spring is provided in the positioning sleeve, and the second spring elastically connects the positioning block and the side wall of the positioning sleeve, and the elastic force of the second spring causes the positioning block to move toward the center of the positioning sleeve.

[0008] Preferably, an inclined surface is provided on the upper side of one end of the positioning plug facing the outside of the positioning sleeve.

[0009] Preferably, the movable frame is provided with a guide socket coaxial with the fixed column, the fixed column is inserted in the guide socket, and the movable frame is also provided with an inner through hole coaxial with the linear drive, the inner through hole is connected to the base, and the working end of the linear drive moves along the inner through hole, and the axis of the inner through hole is in the same straight line as the inner cylinder; the working end of the linear drive is connected to the first inner column and the second inner column coaxially arranged with the inner through hole, the diameter of the second inner column is larger than the diameter of the first inner column, a vertical third inner column is provided on the upper side of the movable pressure plate, the third inner column is inserted in the inner through hole, an inner movable cavity is provided inside the third inner column, the first inner column is inserted at the top opening of the third inner column, the second inner column is slidably installed in the inner movable cavity, and the outer wall of the second inner column fits the inside of the inner movable cavity; a connecting rod is coaxially provided on the top of the first limit block of the drooping block, the connecting rod passes through the top of the inner cylinder into the inner movable cavity, a second limit block is provided on the top of the connecting rod, and the second limit block is inserted in the inner guide hole provided at the bottom of the second inner column.

[0010] Preferably, the length of the inner movable cavity of the third inner column is greater than that of the second inner column; a horizontally extending side extension rod is provided on one side of the second inner column, a vertically extending second waist-shaped through hole is provided on one side of the third inner column, and a vertically extending first waist-shaped through hole is provided on one side of the inner through hole of the movable frame, the side extension rod passes through the second waist-shaped through hole and the first waist-shaped through hole to extend to the outside of the movable frame and is connected to the pressing block; an external clamping unit for clamping and fixing the outer side of the pier is provided on the outside of the movable frame, the external clamping unit includes a downward pressing folding plate located under the pressing block, and a clamping plate slidably installed on the movable frame toward the outer side of the pier, the downward pressing folding plate and the clamping plate are connected by a transmission assembly, and when the pressing block moves downward to press the downward pressing folding plate, the transmission assembly drives the clamping plate to move horizontally to fit the outer side of the pier.

[0011] Preferably, the inner wall of the third inner column is provided with a plurality of locking holes, and the second inner column is provided with side mounting holes with the same number as the locking holes, the side mounting holes horizontally pass through the second inner column, and a movable column and a first spring are provided in the side mounting hole, the first spring elastically connects the side mounting hole and the movable column, and the first spring applies elastic force to the movable column protruding from the inner wall of the second inner column; the length of the movable column is greater than the thickness of the inner wall of the second inner column; when the top end of the second inner column is in contact with the top end of the inner movable cavity of the third inner column, the axis of the movable column and the axis of the locking hole are in the same straight line, and the movable column is inserted into the locking hole; the diameter of the second limit block is the same as the inner diameter of the inner guide hole, and the bottom of the second limit block is provided with a second conical surface with a diameter that gradually decreases downward, and when the bottom of the pendant block is flush with the bottom of the base, the bottom end of the second conical surface is flush with the side mounting hole, and the movable column disengages from the locking hole under the elastic force of the first spring.

[0012] Preferably, the downward pressure folding plate is horizontally arranged and is in an "L" shape. The downward pressure folding plate is connected to the base through a vertically arranged telescopic rod. A third spring is sleeved on the telescopic rod, and the third spring applies elastic force to move the downward pressure folding plate upward; the vertical section of the downward pressure folding plate is provided with a horizontally extending first tooth groove, and the transmission assembly includes a gear shaft, the axis of the gear shaft is horizontally arranged, the gear shaft is rotatably installed on the outer side of the base, and the downward pressure folding plate is meshed with the gear shaft through the first tooth groove; the clamping plate is fixedly connected to a horizontally extending second rack, the second rack is slidably installed on both sides of the base, and the second rack is meshed with the gear shaft.

[0013] Preferably, the inner wall of the clamping plate is provided with a plurality of positioning rods extending horizontally along the moving direction of the clamping plate, and the positioning rods are inserted into holes provided on the outer wall of the pier when the clamping plate is attached to the outer wall of the pier.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Firstly, the self-locking legs in the present invention drive the movable frame and the fixed column to move relative to each other through a linear drive, so that the self-locking legs have a suitable length to meet the connection requirements of the front leg assembly and the middle leg assembly to the pier with a height difference. The positioning bayonet at the bottom of the base cooperates with the installation well on the pier to position the self-locking legs. The cooperation between the positioning plug block and the pendant block enables the staff to lock the positions of the fixed column, the movable frame and the base without manually installing pins, thereby speeding up the progress of bridge construction.

[0016] Secondly, the downward movement of the working end of the linear drive in the present invention can cooperate with the side extension rod of the second inner column and the pressing block installed on the side extension rod to realize the pressing of the downward pressure folding plate of the external clamping unit. The downward movement of the downward pressure folding plate drives the clamping plate to move horizontally toward the side of the pier, and cooperates with the positioning rod on the inner side of the clamping plate to be inserted into the hole on the side of the pier, so as to realize the clamping and fixing of the pier by the clamping plate and enhance the stability of the self-locking support foot on the pier.

[0017] Thirdly, the movable column arranged on the side wall of the second inner column in the present invention cooperates with the second limit block connected to the top of the drooping block to realize that a linear drive is used as a power source, first pressing the movable pressure plate to make the positioning block enter the side through hole and then releasing the connection between the second inner column and the third inner column, so that the side extension rod moves downward relative to the movable pressure plate until the clamping plate is driven to clamp and fit the pier, thereby ensuring the order of locking the pier. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a stereoscopic diagram of a bridge erecting machine used for road and bridge erection construction in a first working state;

[0019] Figure 2 It is a main view of a bridge erecting machine used for road and bridge erection construction in the first working state;

[0020] Figure 3 yes Figure 2 Cross-sectional view at AA of FIG.

[0021] Figure 4 yes Figure 3 A partial enlarged view of point B;

[0022] Figure 5 yes Figure 4 A partial enlarged view of point C;

[0023] Figure 6 It is a partial enlarged view of a bridge erection machine used for road and bridge erection construction in the second working state;

[0024] Figure 7 yes Figure 6 A partial enlarged view of point D;

[0025] Figure 8 yes Figure 6 A local enlarged view of point E;

[0026] Fig. 9 The present invention is a front view of a front leg assembly of a bridge erecting machine used for road and bridge erection construction in a second working state;

[0027] Fig.10 yes Fig. 9 A cross-sectional view at FF of FIG.

[0028] Fig.11 yes Fig.10 A local enlarged view of point G;

[0029] Fig.12 yes Fig.10 A local enlarged view of the H position;

[0030] Fig.13 yes Fig.10 A local enlarged view of location I.

[0031] The numbers in the figure are: 1, machine arm; 11, front leg assembly; 12, middle leg assembly; 13, rear leg assembly; 14, lifting crane; 2, slide; 3, gantry; 4, self-locking leg; 41, fixed column; 42, movable frame; 421, guide socket; 422, inner through hole; 423, first waist-shaped through hole; 43, linear drive; 431, first inner column; 432, second inner column; 433, inner guide hole; 434, side extension rod; 435, pressing block; 436, side mounting hole; 437, movable column; 438, first spring; 44, base; 441, inner cavity; 442, positioning bayonet; 45, movable pressure plate; 451, fixed Positioning sleeve; 452, side through hole; 453, inner cylinder; 454, third inner column; 455, inner movable cavity; 456, second waist-shaped through hole; 457, locking hole; 46, positioning plug; 461, top column; 462, second spring; 47, hanging block; 471, first limit block; 472, first conical surface; 473, connecting rod; 474, second limit block; 475, second conical surface; 48, external clamping unit; 481, downward pressure folding plate; 482, clamping plate; 483, telescopic rod; 484, third spring; 485, first tooth groove; 486, second rack; 487, positioning plug; 49, transmission assembly; 491, gear shaft. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Reference Figures 1 to 13 :

[0034] A bridge erection machine for road and bridge erection construction comprises a machine arm 1, a front leg assembly 11, a middle leg assembly 12, a rear leg assembly 13 and a hoisting crane 14, wherein the front leg assembly 11 and the rear leg assembly 13 each comprise a slide 2 slidably connected to the machine arm 1, and a gantry 3 horizontally mounted on the slide 2, self-locking legs 4 are arranged at both ends of the gantry 3, the self-locking legs 4 comprise at least two fixed columns 41 extending vertically downward, a movable frame 42 sleeved outside the fixed columns 41, and a linear drive 43 driving the movable frame 42 to move vertically, the linear drive 43 being fixedly mounted on the gantry 3; a base 44 contacting a pier is arranged at the bottom of the movable frame 42, an inner cavity 441 is arranged in the base 44, and a positioning bayonet having the same shape as the installation well arranged on the pier is arranged at the bottom of the base 44 442, the linear drive 43 drives the movable frame 42 to move downward, and the positioning bayonet 442 is sleeved on the outside of the installation well on the pier; the movable pressure plate 45 is slidably installed in the inner cavity 441 in the base 44, and a positioning sleeve 451 with the same shape as the installation well is arranged below the movable pressure plate 45, the positioning sleeve 451 is located inside the installation well, and the side wall of the positioning sleeve 451 is provided with at least one side through hole 452 that horizontally penetrates the positioning sleeve 451, and the installation well of the pier is provided with a through hole with the same position as the side through hole 452, and the positioning plug 46 with the same number as the side through hole 452 is slidably installed in the positioning sleeve 451, and the width of the positioning plug 46 is the same as the width of the side through hole 452, and the positioning plug 46 is inserted in the side through hole 452 and the through hole of the installation well to lock the position of the base 44 on the pier.

[0035] The bridge erecting machine in this embodiment is used in the same manner as in the prior art. The front leg assembly 11 is slidably mounted on the machine arm 1 through the slide 2, and the rear leg assembly 13 is fixedly mounted on the other end of the machine arm 1. When the machine arm 1 needs to be moved, the front leg assembly 11 and the middle leg assembly 12 are moved. When the front leg assembly 11 and the middle leg assembly 12 in this embodiment need to be moved, the linear drive 43 drives the movable frame 42 of the self-locking support leg 4 to move upward along the fixed column 41. When it moves to a suitable position, the linear drive 43 drives the movable frame 42 to move downward so that the bottom of the base 44 fits the upper side of the pier. The linear drive 43 can be a hydraulic cylinder, and the bottom of the base 44 is provided with The positioning bayonet 442 is sleeved on the outside of the installation well set on the pier to position the front leg assembly 11. The base 44 of this embodiment has an inner cavity 441 inside, and the movable pressure plate 45 is slidably installed in the inner cavity 441. After the positioning bayonet 442 is sleeved on the outside of the installation well, the positioning sleeve 451 below the movable pressure plate 45 is located inside the installation well. Subsequently, the positioning plug 46 slidably installed in the positioning sleeve 451 can be moved, so that the positioning plug 46 passes through the side through hole 452 of the side wall of the positioning sleeve 451 and is inserted into the through hole on the side of the installation well, thereby completing the locking of the base 44 and the installation well. The forms of the pier, the installation well and the through hole in this embodiment are as follows Figure 1 , Figure 6 and Figure 7 As shown; in this embodiment, the linear drive 43 drives the movable frame 42 and the fixed column 41 to move relative to each other, so that the self-locking support leg 4 has an appropriate length to meet the connection between the front support leg assembly 11 and the middle support leg assembly 12 to the pier with a height difference, and the connection between the self-locking support leg 4 and the pier is automatically locked after the base 44 is connected to the installation well. With the existence of the linear drive 43, the staff does not need to manually install pins to lock the positions of the fixed column 41 and the movable frame 42, thereby accelerating the progress of bridge construction.

[0036] In order to solve the problem of how to automatically move the positioning insert 46 after the positioning sleeve 451 is inserted into the installation well, the following features are specifically set:

[0037] A drooping block 47 is arranged in the positioning sleeve 451, and a first limiting block 471 is arranged on the top of the drooping block 47. The first limiting block 471 is slidably installed in the inner cylinder 453 arranged in the positioning sleeve 451, and the axis of the inner cylinder 453 is arranged vertically; a first conical surface 472 which gradually decreases in the inner diameter is arranged on the upper side of the drooping block 47, and the first conical surface 472 is located below the positioning plug 46, and the drooping block 47 protrudes from the bottom opening of the positioning sleeve 451; a top column 461 is arranged at the bottom of the positioning plug 46, and the top column 461 fits the first conical surface 472 of the drooping block 47, and a second spring 462 is arranged in the positioning sleeve 451, and the second spring 462 elastically connects the positioning plug 46 and the side wall of the positioning sleeve 451, and the elastic force of the second spring 462 causes the positioning plug 46 to move toward the center of the positioning sleeve 451.

[0038] In this embodiment, a drooping block 47 is also slidably installed in the positioning sleeve 451. The drooping block 47 is inserted into the inner cylinder 453 through the first limit block 471 and is kept at a position lower than the bottom of the positioning sleeve 451 under the action of gravity. The drooping block 47 contacts the pier before the bottom of the positioning sleeve 451. When the drooping block 47 is attached to the upper surface of the pier, the positioning sleeve 451 moves downward relative to the drooping block 47. At this time, the top column 461 at the bottom of the positioning plug 46 is attached to the first conical surface 472 of the drooping block 47 and moves away from the surface. The pendant block 47 moves on one side of the axis, thereby driving the positioning block 46 to slide horizontally until the bottom of the positioning sleeve 451 is in contact with the upper surface of the pier, and the front end of the positioning block 46 is inserted into the side through hole 452 and the through hole of the installation well to complete the locking of the position of the base 44, mainly locking the horizontal relative position of the base 44 and the installation well. The first conical surface 472 of the pendant block 47 allows the positioning block 46 to automatically move and complete the locking when the positioning sleeve 451 moves down into the interior of the installation well, without the need for manual operation.

[0039] In order to ensure that when the base 44 is separated from the pier, the positioning plug 46 can automatically move and release the lock on the installation well and the positioning sleeve 451, the following features are specifically set:

[0040] An inclined surface is provided on the upper side of one end of the positioning plug 46 facing the outside of the positioning sleeve 451 .

[0041] In this embodiment, when the positioning sleeve 451 moves upward relative to the installation well, the hanging block 47 remains in place, and the positioning block 46 moves toward the inside of the positioning sleeve 451 under the elastic force of the second spring 462 on the positioning block 46 until the positioning block 46 is separated from the through hole of the installation well. The inclined surface of the positioning block 46 toward the outside of the positioning sleeve 451 can enable the positioning block 46 to move horizontally into the interior of the positioning sleeve 451. During this process, the positioning sleeve 451 has sufficient longitudinal space to move upward until the positioning block 46 completely enters the positioning sleeve 451, thereby releasing the connection between the self-locking support foot 4 and the pier, thereby facilitating the movement of the front leg assembly 11 or the middle leg assembly 12. Moreover, this process does not require manual participation, thereby speeding up work efficiency.

[0042] In order to solve the problem of how to drive the movable frame 42 and the movable pressing plate 45 slidably installed in the base 44 to move up and down through the linear drive 43, the following features are specifically set:

[0043] The movable frame 42 is provided with a guide socket 421 coaxial with the fixed column 41, and the fixed column 41 is inserted in the guide socket 421. The movable frame 42 is also provided with an inner through hole 422 coaxial with the linear driver 43, and the inner through hole 422 is connected to the base 44. The working end of the linear driver 43 moves along the inner through hole 422, and the axis of the inner through hole 422 is on the same straight line as the inner cylinder 453; the working end of the linear driver 43 is connected to the first inner column 431 and the second inner column 432 coaxially arranged with the inner through hole 422, and the diameter of the second inner column 432 is larger than the diameter of the first inner column 431, and a vertical third inner column is provided on the upper side of the movable pressure plate 45 454, the third inner column 454 is inserted in the inner through hole 422, the inner part of the third inner column 454 is provided with an inner movable cavity 455, the first inner column 431 is inserted in the top opening of the third inner column 454, the second inner column 432 is slidably installed in the inner movable cavity 455, and the outer wall of the second inner column 432 fits the inner movable cavity 455; a connecting rod 473 is coaxially provided on the top of the first limiting block 471 of the pendant block 47, the connecting rod 473 passes through the top of the inner tube 453 and enters the inner movable cavity 455, a second limiting block 474 is provided on the top of the connecting rod 473, and the second limiting block 474 is inserted in the inner guide hole 433 provided at the bottom of the second inner column 432.

[0044] In this embodiment, the fixed column 41 guides the movement of the movable frame 42 by being inserted into the guide socket 421 of the movable frame 42 to prevent the working end of the linear driver 43 from being bent by force when moving in the inner through hole 422 of the movable frame 42. The linear driver 43 connects the first inner column 431 and the second inner column 432 coaxially arranged in the inner through hole 422. The second inner column 432 is inserted into the third inner column 454 on the upper side of the movable pressure plate 45. Since the diameter of the second inner column 432 is larger than the diameter of the top opening of the third inner column 454, the second inner column 432 can only move in the inner movable cavity 455 of the third inner column 454. When the working end of the linear driver 43 moves upward, the second inner column 432 fits the inner movable cavity 455. The top of the third inner column 454 and the positioning sleeve 451 are driven upward by the movable pressure plate 45. When the movable pressure plate 45 moves up to the top of the inner cavity 441 of the base 44, the base 44 and the movable frame 42 are driven upward. Similarly, when the working end of the linear drive 43 moves downward, the movable pressure plate 45 follows the second inner column 432 to move downward under the action of gravity, and keeps the second inner column 432 close to the top of the inner movable cavity 455 of the third inner column 454. The base 44 and the movable frame 42 follow the movable pressure plate 45 to move downward under the action of gravity, and keep the movable pressure plate 45 close to the top of the inner cavity 441 of the base 44. After the base 44 is close to the upper surface of the pier, the movable pressure plate 45 follows the second inner column 432 to move downward, so that the positioning sleeve 451 is inserted into the installation well.

[0045] In order to enhance the connection stability between the self-locking support foot 4 and the pier, the following features are specifically set:

[0046] The length of the inner movable cavity 455 of the third inner column 454 is greater than the length of the second inner column 432; a horizontally extending side extension rod 434 is provided on one side of the second inner column 432, a vertically extending second waist-shaped through hole 456 is provided on one side of the third inner column 454, a vertically extending first waist-shaped through hole 423 is provided on one side of the inner through hole 422 of the movable frame 42, and the side extension rod 434 passes through the second waist-shaped through hole 456 and the first waist-shaped through hole 423 to extend to the outside of the movable frame 42 and connects to the pressing block 4 35; An external clamping unit 48 for clamping and fixing the outer side of the pier is arranged on the outside of the movable frame 42. The external clamping unit 48 includes a downward pressing folding plate 481 located below the pressing block 435, and a clamping plate 482 slidably installed on the movable frame 42 toward the outer side of the pier. The downward pressing folding plate 481 and the clamping plate 482 are connected by a transmission assembly 49. When the pressing block 435 moves downward to press the downward pressing folding plate 481, the transmission assembly 49 drives the clamping plate 482 to move horizontally to fit the outer side of the pier.

[0047] The length of the inner movable cavity 455 of the third inner column 454 in this embodiment is greater than the length of the second inner column 432. Therefore, the second inner column 432 can move downward relative to the third inner column 454 in the inner movable cavity 455. When the positioning sleeve 451 completely enters the installation well and the positioning plug 46 locks the positioning sleeve 451 and the installation well, the movable pressure plate 45 cannot move, but the second inner column 432 can move downward relative to the third inner column 454 under the drive of the linear drive 43. The side extension rod 434 set on one side of the second inner column 432 can continue to move downward until it contacts the downward folding plate 481 of the external clamping unit 48 installed on the base 44, and drives the downward folding plate 481 to be pressed downward. The transmission assembly 49 starts the clamping plate 482 to move horizontally until the clamping plates 482 of the two self-locking legs 4 clamp and fix the two sides of the pier, thereby improving the stability of the front support leg assembly 11 and the middle support leg assembly 12 on the pier. The third inner column 454 in this embodiment is provided with a second waist-shaped through hole 456, and a first waist-shaped through hole 423 is provided on one side of the inner through hole 422 of the movable frame 42. The side extension rod 434 passes through the second waist-shaped through hole 456 and the first waist-shaped through hole 423 and extends to the outside of the movable frame 42 and is connected with the pressing block 435. The second waist-shaped through hole 456 and the first waist-shaped through hole 423 guide the moving path of the side extension rod 434 to ensure that the pressing block 435 moves in the vertical direction.

[0048] In order to solve the problem of how to prevent the gravity of the movable pressing plate 45 from failing to press the positioning plug 46 to move in contact with the surface of the first conical surface 472, the following features are specifically provided:

[0049] The inner wall of the third inner column 454 is provided with a plurality of locking holes 457. The second inner column 432 is provided with side mounting holes 436 having the same number as the locking holes 457. The side mounting holes 436 horizontally penetrate the second inner column 432. A movable column 437 and a first spring 438 are provided in the side mounting holes 436. The first spring 438 elastically connects the side mounting holes 436 and the movable column 437. The first spring 438 applies elastic force to the movable column 437 protruding from the inner wall of the second inner column 432. The length of the movable column 437 is greater than the thickness of the inner wall of the second inner column 432. The second inner column 432 When the top end is in contact with the top end of the inner movable cavity 455 of the third inner column 454, the axis of the movable column 437 and the axis of the locking hole 457 are on the same straight line, and the movable column 437 is inserted into the locking hole 457; the diameter of the second limit block 474 is the same as the inner diameter of the inner guide hole 433, and the bottom of the second limit block 474 is provided with a second conical surface 475 whose diameter gradually decreases downward. When the bottom of the pendant block 47 is flush with the bottom of the base 44, the bottom end of the second conical surface 475 is flush with the side mounting hole 436, and the movable column 437 is disengaged from the locking hole 457 under the elastic force of the first spring 438.

[0050] In this embodiment, a movable column 437 is slidably installed in the side installation hole 436 of the side wall of the second inner column 432. When the movable column 437 is inserted into the locking hole 457 of the third inner column 454, the second inner column 432 and the third inner column 454 can be locked, so that the movable pressure plate 45 can be subjected to the downward pressure of the working end of the linear drive 43, ensuring that when the positioning sleeve 451 enters the installation well, pressure can be applied to the positioning plug 46, so that the top column 461 of the positioning plug 46 fits the first conical surface 472 of the drooping block 47 and moves. In the normal state, the inner end of the movable column 437 protrudes from the inner wall of the inner guide hole 433 of the second inner column 432, but in the process of the linear drive 43 pulling the movable frame 42 upward, the second limit block 474 of the drooping block 47 fits the inner wall of the inner guide hole 433 of the second inner column 432, and the second limit block 474 presses the inner end of the movable column 437, so that the movable column 437 compresses the first spring 438 and moves outward. The top end is fitted with the top end of the inner movable cavity 455 of the third inner column 454. At this time, the side mounting hole 436 and the locking hole 457 are on the same straight line, and the movable column 437 is inserted into the locking hole 457; after the sagging block 47 is fitted with the upper surface of the pier, the second limit block 474 moves upward relatively in the inner movable cavity 455. When the movable pressure plate 45 stops moving completely, the second conical surface 475 of the second limit block 474 is located at the side mounting hole 436, and the movable column 437 is released from the lock under the elastic force of the first spring 438 Hole 457, so the second inner column 432 can continue to move downward in the inner movable cavity 455 relative to the movable pressure plate 45 under the push of the linear drive 43, and the clamping plate 482 driven by the external clamping unit 48 can clamp the pier. In this embodiment, after the base 44 is connected and locked with the safety well of the pier, the clamping plate 482 of the external clamping unit 48 can be driven to clamp the two sides of the pier, thereby automatically improving the stability of the self-locking support leg 4, and can adapt to piers of different widths, thereby expanding the scope of application.

[0051] In order to solve the problem of how to make the clamping plate 482 move horizontally when the pressing block 435 presses the folding plate 481 downward, the following features are specifically set:

[0052] The downward pressure folding plate 481 is horizontally arranged, and the downward pressure folding plate 481 is in an "L" shape. The downward pressure folding plate 481 is connected to the base 44 through a vertically arranged telescopic rod 483. A third spring 484 is sleeved on the telescopic rod 483, and the third spring 484 applies an elastic force to move the downward pressure folding plate 481 upward; the vertical section of the downward pressure folding plate 481 is provided with a horizontally extending first tooth groove 485, and the transmission assembly 49 includes a gear shaft 491, the axis of the gear shaft 491 is horizontally arranged, and the gear shaft 491 is rotatably installed on the outer side of the base 44, and the downward pressure folding plate 481 is meshed and connected with the gear shaft 491 through the first tooth groove 485; the clamping plate 482 is fixedly connected to the horizontally extending second rack 486, and the second rack 486 is slidably installed on both sides of the base 44, and the second rack 486 is meshed and connected with the gear shaft 491.

[0053] The inner wall of the clamping plate 482 is provided with a plurality of positioning rods 487 extending horizontally along the moving direction of the clamping plate 482. When the clamping plate 482 is attached to the outer wall of the pier, the positioning rods 487 are inserted into holes provided in the outer wall of the pier.

[0054] The pressing folding plate 481 of the present embodiment is in an "L" shape. The pressing folding plate 481 is kept at a certain height under the elastic force of the telescopic rod 483. When the pressing block 435 presses down the horizontal section of the pressing folding plate 481, the first tooth groove 485 of the vertical section of the pressing folding plate 481 is meshed with the gear shaft 491 of the transmission assembly 49. Therefore, the pressing folding plate 481 moves downward to drive the gear shaft 491 to rotate. The rotation of the gear shaft 491 drives the second rack 486 meshed with it to move horizontally. The second rack 486 drives the clamping plate 482 to move horizontally. The arrangement of the two racks 486 on the side of the gear shaft 491 can realize the downward movement of the downward pressure folding plate 481 and drive the clamping plate 482 to move horizontally toward the side of the pier, and cooperate with the positioning rod 487 on the inner side of the clamping plate 482 to be inserted into the hole on the side of the pier to realize the clamping and fixing of the pier by the clamping plate 482, thereby enhancing the stability of the self-locking support foot 4 on the pier. When the linear drive 43 drives the second inner column 432 to move upward, the pressing block 435 moves upward. At this time, the downward pressure folding plate 481 moves upward under the elastic force of the telescopic rod 483, and cooperates with the gear shaft 491 to drive the clamping plate 482 away from the pier.

[0055] Working principle: When the bridge erecting machine is in use, the front leg assembly 11 and the middle leg assembly 12 are moved to change the position of the machine arm 1 respectively. Before the front leg assembly 11 or the rear leg assembly 13 moves, the linear drive 43 drives the movable frame 42 of the self-locking leg 4 to move up along the fixed column 41, and then the slide 2 moves along the machine arm 1 to the upper side of the pier, and the linear drive 43 drives the movable frame 42 to move down so that the bottom of the base 44 fits the upper side of the pier, and the positioning bayonet 442 at the bottom of the base 44 is sleeved on the outside of the installation well, and then the movable pressure plate 45 in the base 44 continues to move down, and the positioning sleeve 451 under the movable pressure plate 45 is located inside the installation well, and then the positioning sleeve 451 can be used to fix the movable pressure plate 45. The positioning block 46 slidably installed in the positioning sleeve 451 moves, so that the positioning block 46 passes through the side through hole 452 on the side wall of the positioning sleeve 451 and is inserted into the through hole on the side of the installation well, thereby locking the base 44 and the installation well position, and cooperating with the clamping plate 482 of the subsequent external clamping unit 48 to clamp the pier to maintain the stability of the self-locking support leg 4 on the pier. After the beam is installed, the linear drive 43 drives the movable frame 42 to move upward. The process of the working end of the linear drive 43 moving upward automatically releases the position lock of the external clamping unit 48 and the positioning block 46 in turn, so that the base 44 moves upward to facilitate the subsequent translation of the front support leg assembly 11 or the rear support leg assembly 13.

Claims

1. A bridge erection machine for road and bridge erection construction, comprising a machine arm (1), a front outrigger assembly (11), a middle outrigger assembly (12), a rear outrigger assembly (13) and a hoisting crane (14), characterized in that: The front leg assembly (11) and the rear leg assembly (13) both include a slide (2) slidably connected to the arm (1), and a gantry (3) horizontally mounted on the slide (2), with self-locking legs (4) being provided at both ends of the gantry (3), the self-locking legs (4) including at least two fixed columns (41) extending vertically downward, a movable frame (42) sleeved outside the fixed columns (41), and a linear drive (43) driving the movable frame (42) to move vertically, the linear drive (43) being fixedly mounted on the gantry (3); A base (44) contacting the pier is provided at the bottom of the movable frame (42), an inner cavity (441) is provided in the base (44), and a positioning bayonet (442) having the same shape as the installation well provided on the pier is provided at the bottom of the base (44), the linear drive (43) drives the movable frame (42) to move downward, and the positioning bayonet (442) is sleeved on the outside of the installation well on the pier; A movable pressing plate (45) is slidably installed in the inner cavity (441) of the base (44), a positioning sleeve (451) having the same shape as the installation well is arranged below the movable pressing plate (45), the positioning sleeve (451) is located inside the installation well, a side wall of the positioning sleeve (451) is provided with at least one side through hole (452) horizontally penetrating the positioning sleeve (451), a through hole having the same position as the side through hole (452) is arranged on the installation well of the pier, and positioning plugs (46) having the same number as the side through holes (452) are slidably installed in the positioning sleeve (451), the width of the positioning plugs (46) being the same as the width of the side through holes (452), and the positioning plugs (46) being inserted into the side through holes (452) and the through holes of the installation well to lock the position of the base (44) on the pier; A drooping block (47) is arranged in the positioning sleeve (451), a first limiting block (471) is arranged on the top of the drooping block (47), and the first limiting block (471) is slidably installed in an inner cylinder (453) arranged in the positioning sleeve (451), and the axis of the inner cylinder (453) is arranged vertically; A first conical surface (472) which gradually decreases in the inner diameter is provided on the upper side of the drooping block (47), the first conical surface (472) is located below the positioning plug block (46), and the drooping block (47) protrudes from the bottom opening of the positioning sleeve (451); A top column (461) is disposed at the bottom of the positioning plug (46), the top column (461) is in contact with the first conical surface (472) of the drooping block (47), a second spring (462) is disposed in the positioning sleeve (451), the second spring (462) elastically connects the positioning plug (46) and the side wall of the positioning sleeve (451), and the elastic force of the second spring (462) causes the positioning plug (46) to move toward the center of the positioning sleeve (451); An inclined surface is provided on the upper side of one end of the positioning plug block (46) facing the outside of the positioning sleeve (451).

2. A bridge erection machine for road and bridge erection construction according to claim 1, characterized in that: The movable frame (42) is provided with a guide socket (421) coaxial with the fixed column (41), the fixed column (41) is inserted into the guide socket (421), and the movable frame (42) is also provided with an inner through hole (422) coaxial with the linear drive (43), the inner through hole (422) is connected to the base (44), and the working end of the linear drive (43) moves along the inner through hole (422), and the axis of the inner through hole (422) and the inner cylinder (453) are on the same straight line; The working end of the linear drive (43) is connected to a first inner column (431) and a second inner column (432) coaxially arranged with the inner through hole (422); the diameter of the second inner column (432) is larger than the diameter of the first inner column (431); a vertical third inner column (454) is arranged on the upper side of the movable pressure plate (45); the third inner column (454) is inserted into the inner through hole (422); an inner movable cavity (455) is arranged inside the third inner column (454); the first inner column (431) is inserted into the top opening of the third inner column (454); the second inner column (432) is slidably installed in the inner movable cavity (455); and the outer wall of the second inner column (432) fits the inside of the inner movable cavity (455); A connecting rod (473) is coaxially arranged on the top of the first limiting block (471) of the drooping block (47). The connecting rod (473) passes through the top of the inner cylinder (453) and enters the inner movable cavity (455). A second limiting block (474) is arranged on the top of the connecting rod (473). The second limiting block (474) is inserted into an inner guide hole (433) arranged at the bottom of the second inner column (432).

3. A bridge erection machine for road and bridge erection construction according to claim 2, characterized in that: The inner movable cavity (455) of the third inner column (454) has a length greater than that of the second inner column (432); A horizontally extending side extension rod (434) is provided on one side of the second inner column (432), a vertically extending second waist-shaped through hole (456) is provided on one side of the third inner column (454), a vertically extending first waist-shaped through hole (423) is provided on one side of the inner through hole (422) of the movable frame (42), and the side extension rod (434) passes through the second waist-shaped through hole (456) and the first waist-shaped through hole (423) to extend to the outside of the movable frame (42) and connect to the pressing block (435); An external clamping unit (48) for clamping and fixing the outer side of the pier is arranged outside the movable frame (42). The external clamping unit (48) includes a downward pressing folding plate (481) located below the pressing block (435), and a clamping plate (482) slidably mounted on the movable frame (42) toward the outer side of the pier. The downward pressing folding plate (481) and the clamping plate (482) are connected to each other through a transmission assembly (49). When the pressing block (435) moves downward to press the downward pressing folding plate (481), the transmission assembly (49) drives the clamping plate (482) to move horizontally to fit the outer side of the pier.

4. A bridge erection machine for road and bridge erection construction according to claim 3, characterized in that: The inner wall of the third inner column (454) is provided with a plurality of locking holes (457); the second inner column (432) is provided with side mounting holes (436) having the same number as the locking holes (457); the side mounting holes (436) horizontally penetrate the second inner column (432); a movable column (437) and a first spring (438) are provided in the side mounting holes (436); the first spring (438) elastically connects the side mounting holes (436) and the movable column (437); the first spring (438) applies elastic force to the movable column (437) protruding from the inner wall of the second inner column (432); The length of the movable column (437) is greater than the thickness of the inner wall of the second inner column (432); When the top end of the second inner column (432) fits against the top end of the inner movable cavity (455) of the third inner column (454), the axis of the movable column (437) and the axis of the locking hole (457) are on the same straight line, and the movable column (437) is inserted into the locking hole (457); The diameter of the second limit block (474) is the same as the inner diameter of the inner guide hole (433). The bottom of the second limit block (474) is provided with a second conical surface (475) whose diameter gradually decreases downward. When the bottom of the hanging block (47) is flush with the bottom of the base (44), the bottom end of the second conical surface (475) is flush with the side mounting hole (436), and the movable column (437) is separated from the locking hole (457) under the elastic force of the first spring (438).

5. A bridge erection machine for road and bridge erection construction according to claim 3, characterized in that: The downward pressure folding plate (481) is arranged horizontally and is in an "L" shape. The downward pressure folding plate (481) is connected to the base (44) via a vertically arranged telescopic rod (483). A third spring (484) is sleeved on the telescopic rod (483). The third spring (484) applies an elastic force to move the downward pressure folding plate (481) upward. The vertical section of the downward-pressing folding plate (481) is provided with a first tooth groove (485) extending horizontally, the transmission assembly (49) comprises a gear shaft (491), the axis of the gear shaft (491) is arranged horizontally, the gear shaft (491) is rotatably mounted on the outside of the base (44), and the downward-pressing folding plate (481) is meshedly connected with the gear shaft (491) via the first tooth groove (485); The clamping plate (482) is fixedly connected to a second rack (486) extending horizontally. The second rack (486) is slidably mounted on both sides of the base (44). The second rack (486) is meshingly connected to the gear shaft (491).

6. A bridge erection machine for road and bridge erection construction according to claim 3, characterized in that: The inner wall of the clamping plate (482) is provided with a plurality of positioning rods (487) extending horizontally along the moving direction of the clamping plate (482). When the clamping plate (482) is attached to the outer wall of the pier, the positioning rods (487) are inserted into holes provided on the outer wall of the pier.

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