A new loading method for load test of segmental assembly bridge erecting machine

Abstract

The present invention proposes a new loading method for the load test of the segment assembly bridge-building machine, which relates to the technical field of the load test method of the segment assembly bridge-building machine, and includes the following steps: Step 1: After all the segment blocks are evenly suspended by the segment assembly bridge-building machine, a lowering space for the crane hoist is reserved at the mid-span position of the main frame of the segment assembly bridge-building machine, and a counterweight segment block is placed on the ground below the lowering space; Step 2: The crane hoist is moved to the top of the lowering space, the hoist is lowered so that it passes through the lowering space, and the counterweight segment block is lifted by the hoist to complete the loading of the load test of the main frame of the segment assembly bridge-building machine. The use of this counterweight method can effectively prevent the damage to the beam body of the segment block caused by improper loading, prevent the risk of the counterweight sliding, and save manpower and material resources. If there is an abnormal detection indicator or an unexpected situation, it can be unloaded in time to avoid accidents caused by untimely unloading.

Description

Technical Field

[0001] The invention relates to the technical field of a load test method for a bridge erecting machine, and more specifically to the technical field of a load test method for a segment assembly bridge erecting machine. Background Art

[0002] After the segmental assembly bridge erection machine is installed, the whole machine needs to be loaded to verify the strength, rigidity and deformation of the main frame after loading. The weight loaded is generally 1.1 times the hanging weight of the entire span segment beam. Take a segmental assembly bridge erection machine with a span of 50m, 15 segment blocks, and a hanging weight of 1500t (generally ranging from 1400t to 2000t) as an example. In addition to hanging 15 segment beams, it is also necessary to load 1500t*0.1=150t counterweight blocks.

[0003] The conventional loading method is as follows: the counterweight blocks are generally placed on the segment blocks in the form of ton bags (i.e. sand bags) or water bags. The counterweight blocks are 1 t each, that is, a total of 150 counterweight blocks are required, with an average of 10 counterweight blocks required on each segment block.

[0004] This loading method has the following disadvantages: 1. Since no transverse prestress is applied to a single segment block, more than 10 ton bags are placed on the segment block beam surface, which can easily cause the beam flange plate and top plate to be overstressed, and easily damage the beam body;

[0005] 2. The available space on the beam surface is limited, and it is difficult to place so many ton bags. In addition, improper placement will cause unbalanced loading, which can easily slide to the ground and cause high-altitude falling accidents;

[0006] 3. The lifting and lowering of these more than 150 tons of bags not only requires a lot of manpower and material resources, but also takes at least 3 working days;

[0007] 4. If abnormal detection indicators appear during the loading process, or unexpected situations occur, the bridge crane cannot be unloaded in time. Summary of the invention

[0008] The invention proposes a new loading method for a load test of a segment assembly bridge erecting machine, which solves the problem in the prior art that a ton bag or a water bag is used to place a counterweight on a segment block for loading.

[0009] The technical solution of the present invention is achieved in this way:

[0010] A new loading method for a segmental assembly bridge erecting machine load test comprises the following steps:

[0011] Step 1: After all the segment blocks are evenly suspended by the segment assembly bridge erecting machine, a lowering space for the crane hoist is reserved at the mid-span position of the main frame of the segment assembly bridge erecting machine, and a counterweight segment block is placed on the ground below the lowering space;

[0012] Step 2: Move the sling to the top of the lowering space by the crane, lower the sling so that it passes through the lowering space, lift the counterweight segment block by the sling, and complete the loading of the main frame load test of the segment assembly bridge crane.

[0013] Furthermore, in step 1, by staggering the segment blocks up and down, a space for lowering the crane hoist is reserved at the mid-span position of the main frame of the segment assembly bridge-building machine.

[0014] Further, the hoist includes a hanging pulley, a hanging scale, a hanger, a transverse frame, a longitudinal frame, a rotating frame, a pair of slides, a pair of telescopic columns, a first laser, a first camera, an LED lamp, a travel switch, a second laser and a second camera; the hanging pulley is connected to the electric hoist of the lifting crane through a wire rope, the upper end of the hanging scale is fixedly connected to the hanging pulley, the lower end of the hanging scale is fixedly connected to the hanger through a sling, the transverse frame is movably mounted on the hanger through a transverse mechanism, the longitudinal frame is movably mounted on the transverse frame through a longitudinal mechanism, the rotating frame is movably mounted on the longitudinal frame through a rotating mechanism, the pair of slides are movably mounted on the rotating frame through a linear mechanism, the pair of telescopic columns are movably mounted on the slides through a telescopic mechanism, the first laser, the first camera, the LED lamp and the travel switch are respectively fixedly mounted on the lower end of the slide through a first bracket, and the second laser and the second camera are respectively fixedly mounted on the rotating frame through a second bracket;

[0015] In step 2, the method of lifting the counterweight segment block by a lifting device comprises the following steps:

[0016] Step A: symmetrically arranged hooks are provided on the counterweight segment block, a bracket for lifting with a sling is pre-fixed on the counterweight segment block using bolts and nuts, symmetrically arranged mounting seats are provided on the bracket, a groove corresponding to the slide seat is provided on the mounting seat, a lifting hole corresponding to the telescopic column is provided on the side wall of the groove, a first positioning plate is provided on the bottom wall of the groove, a first positioning point corresponding to the first laser is marked on the first positioning plate, a second positioning plate is provided on the bracket, and a second positioning point corresponding to the second laser is marked on the second positioning plate;

[0017] Step B: The spreader is lowered to a height close to the hanger by the electric hoist of the crane, and then the laser is emitted by the second laser. At the same time, the position image of the laser irradiation point is transmitted to the control room of the crane in real time by the second camera. Then, the operator in the control room controls the transverse movement mechanism, the longitudinal movement mechanism and the rotation mechanism to move the position of the rotating frame so that the laser emitted by the second laser is directly facing the second positioning point on the second positioning plate, thereby completing the first positioning of the spreader;

[0018] Step C: The laser is emitted by the first laser, and the position image of the laser irradiation point is transmitted to the control room of the crane in real time through the first camera. Then, the operator in the control room controls the linear mechanism to move the position of the slide seat so that the laser emitted by the first laser is directly aligned with the first positioning point on the first positioning plate, thereby completing the second positioning of the spreader;

[0019] Step D: After the second positioning in step C, the slide is aligned with the groove of the hitch seat, and then the operator in the control room controls the electric hoist to lower the spreader so that the slide is stuck in the groove. When the travel switch touches the first positioning plate, the switch signal is transmitted to the control system in the control room. Then the control system controls the electric hoist to stop, and at the same time controls the telescopic mechanism to extend the telescopic column and stick it into the lifting hole to complete the connection between the spreader and the hanger. Then the spreader is lifted by the electric hoist to lift the counterweight segment block. After the counterweight segment block is suspended in the air, it is weighed by a crane scale. If the weight does not meet the loading requirements, a ton bag of the required weight is hung on the hook, and then the counterweight segment block is lifted to a height of 100 to 300 mm from the ground by the electric hoist.

[0020] Furthermore, the transverse movement mechanism includes a first motor, a first pulley, a first rack and a first guide rail, the first rack and the first guide rail are fixedly mounted on the hanger, the first pulley is movably mounted on the transverse movement frame, the transverse movement frame is movably mounted on the first guide rail through the first pulley, the first motor is fixedly mounted on the transverse movement frame, and a first gear is arranged on the output shaft of the first motor, and the first gear is meshed with the first rack.

[0021] Furthermore, the longitudinal movement mechanism includes a second motor, a second pulley, a second rack and a second guide rail, the second rack and the second guide rail are fixedly mounted on the transverse movement frame, the second pulley is movably mounted on the longitudinal movement frame, the longitudinal movement frame is movably mounted on the second guide rail through the second pulley, the second motor is fixedly mounted on the longitudinal movement frame, and a second gear is arranged on the output shaft of the second motor, and the second gear is meshed with the second rack.

[0022] Furthermore, the rotating mechanism includes a third motor, a rotating shaft is provided on the rotating frame, the rotating shaft is movably mounted on the longitudinal moving frame through a radial bearing and a thrust bearing, the third motor is fixedly mounted on the longitudinal moving frame, a gear ring is provided on the rotating shaft, and a driving gear is provided on the output shaft of the third motor, and the driving gear is meshed with the gear ring.

[0023] Furthermore, the linear mechanism includes a support, a fourth motor and a fourth screw respectively. The support is fixedly mounted on the rotating frame, a guide rod is arranged on the support, a guide hole is opened on the slide, the slide is movably mounted on the guide rod through the guide hole, a fourth screw hole is opened on the slide, the fourth screw is movably mounted on the support, the fourth screw is threadedly connected to the fourth screw hole of the slide, and the fourth motor is fixedly mounted on the support and is transmission-connected to the fourth screw.

[0024] Furthermore, the telescopic mechanism includes a fifth motor, a worm wheel and a worm respectively. A slide groove is opened inside the sliding seat, the telescopic column is movably inserted in the slide groove, a fifth screw hole is opened on the telescopic column, the worm wheel is movably installed in the sliding seat, and fifth screws with opposite thread rotation directions are respectively arranged at both ends of the worm wheel. The fifth screws are respectively threadedly connected with the fifth screw holes of the telescopic column, the worm is movably installed in the sliding seat, the worm is meshed with the worm wheel, and the fifth motor is fixedly installed in the sliding seat and is drivingly connected to the worm.

[0025] The beneficial effects that can be achieved by the present invention using the above technical solution are:

[0026] 1. After all the segmental blocks are evenly suspended by the segmental assembly bridge-building machine, reserve a lowering space for the crane hoist at the mid-span position of the main frame of the segmental assembly bridge-building machine, and then move the hoist to the top of the lowering space by the crane, lower the hoist so that it passes through the lowering space, and lift the counterweight segmental block by the hoist to complete the loading of the main frame load test of the segmental assembly bridge-building machine. This counterweight method can effectively prevent the damage to the beam body caused by improper loading of the segmental block and prevent the risk of the counterweight sliding. While saving manpower and material resources, it can be unloaded in time if abnormal detection indicators or unexpected situations occur, avoiding accidents caused by untimely unloading.

[0027] 2. The laser is emitted by the first laser and the second laser, and the position image of the laser irradiation point is transmitted to the control room of the crane in real time through the first camera and the second camera. Then the operator in the control room controls the transverse mechanism, the longitudinal mechanism, the rotation mechanism and the linear mechanism to align the laser irradiation points of the first laser and the second laser with the first positioning point and the second positioning point respectively, so as to accurately position the spreader and insert the slide into the groove. When the travel switch touches the first positioning plate, the switch signal is transmitted to the control system in the control room. Then the control system controls the electric hoist to stop and controls the telescopic mechanism to extend the telescopic column and insert it into the lifting hole to complete the hanging of the spreader and the bracket. Therefore, only one operator is needed to complete the hanging and lifting operation of the spreader on the counterweight segment block, which effectively saves manpower and material resources and improves the test efficiency of the load of the segment assembly bridge erecting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the middle spreader;

[0031] Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A;

[0032] Figure 4 for Figure 2 Side view of

[0033] Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0034] Figure 6 for Figure 5 A partial enlarged schematic diagram of point C in the middle;

[0035] Figure 7 This is a schematic diagram when the slide seat is not inserted into the groove;

[0036] Figure 8 for Figure 7 DD cross-sectional view.

[0037] In the accompanying drawings, the components corresponding to the reference numbers are as follows:

[0038] 1-segment block, 2-segment assembly bridge erecting machine main frame, 3-lifting crane, 5-lowering space, 6-counterweight segment block, 7-hanging bracket, 8-hanging pulley, 9-hanging scale, 10-hanging bracket, 11-transverse frame, 12-longitudinal frame, 13-rotating frame, 14-sliding seat, 15-first laser, 16-first camera, 17-second laser, 18-second camera, 19-LED lamp, 20-telescopic column, 21-hook seat, 22-groove, 23-lifting hole, 24-first bracket, 25-first positioning plate, 26-second positioning plate, 27-first motor, 28-first pulley, 29-first rack, 30-first guide rail, 31- The first gear, 32-the second motor, 33-the second pulley, 34-the second rack, 35-the second guide rail, 36-the second gear, 37-the third motor, 38-the rotating shaft, 39-the radial bearing, 40-the thrust bearing, 41-the ring gear, 42-the driving gear, 43-the support, 44-the fourth motor, 45-the fourth screw, 47-the fifth motor, 49-the worm gear, 50-the worm, 51-the guide rod, 52-the guide hole, 53-the fourth screw hole, 54-the slide groove, 55-the fifth screw hole, 56-the fifth screw, 57-the hook, 58-the wire rope, 59-the bolt, 60-the nut, 61-the sling, 62-the second bracket, 63-the travel switch. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. 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.

[0040] Reference Figure 1 A new loading method for a segmental assembly bridge erecting machine load test includes the following steps:

[0041] Step 1: After all segment blocks 1 are evenly suspended by the segment assembly bridge erecting machine, a lowering space 5 for the hoisting device of the crane 3 is reserved at the mid-span position of the main frame 2 of the segment assembly bridge erecting machine, and a counterweight segment block 6 is placed on the ground below the lowering space 5;

[0042] Step 2: Move the sling to the top of the lowering space 5 by the lifting crane 3, lower the sling so that it passes through the lowering space 5, lift the counterweight segment block 6 by the sling, and complete the loading of the load test of the main frame 2 of the segment assembly bridge-building machine.

[0043] In the step 1, by staggering the segment blocks 1 up and down, a space 5 for lowering the hoisting device of the crane 3 is reserved at the mid-span position of the main frame 2 of the segment assembly bridge-building machine.

[0044] Reference Figures 2 to 8 The hoist includes a lifting pulley 8, a hanging scale 9, a hanger 10, a transverse frame 11, a longitudinal frame 12, a rotating frame 13, a pair of slides 14, a pair of telescopic columns 20, a first laser 15, a first camera 16, an LED lamp 19, a travel switch 63, a second laser 17 and a second camera 18. The lifting pulley 8 is connected to the electric hoist of the lifting crane 3 through a wire rope 58. The upper end of the hanging scale 9 is fixedly connected to the lifting pulley 8, and the lower end of the hanging scale 9 is fixedly connected to the hanger 10 through a sling 61. The transverse frame 11 is movably installed on the hanger 10 through a transverse mechanism. The moving frame 12 is movably installed on the transverse moving frame 11 through a longitudinal moving mechanism, the rotating frame 13 is movably installed on the longitudinal moving frame 12 through a rotating mechanism, the paired slides 14 are movably installed on the rotating frame 13 through linear mechanisms, the paired telescopic columns 20 are movably installed on the slides 14 through telescopic mechanisms, the first laser 15, the first camera 16, the LED light 19 and the travel switch 63 are respectively fixedly installed on the lower end of the slide 14 through the first bracket 24, and the second laser 17 and the second camera 18 are respectively fixedly installed on the rotating frame 13 through the second bracket 62.

[0045] In step 2, the method of lifting the counterweight segment block 6 by a lifting device includes the following steps:

[0046] Step A: symmetrically arranged hooks 57 are provided on the counterweight segment block 6, a hanger 7 for lifting with a sling is pre-fixed on the counterweight segment block 6 using bolts 59 and nuts 60, symmetrically arranged hanging seats 21 are provided on the hanger 7, a groove 22 corresponding to the slide seat 14 is provided on the hanging seat 21, a lifting hole 23 corresponding to the telescopic column 20 is provided on the side wall of the groove 22, a first positioning plate 25 is provided on the bottom wall of the groove 22, a first positioning point corresponding to the first laser 15 is marked on the first positioning plate 25, a second positioning plate 26 is provided on the hanger 7, a second positioning point corresponding to the second laser 17 is marked on the second positioning plate 26;

[0047] Step B: Reference Figure 7 , the spreader is lowered to a height close to the hanger 7 by the electric hoist of the crane 3, and then the laser is emitted by the second laser 17. At the same time, the position image of the laser irradiation point is transmitted to the control room of the crane 3 in real time by the second camera 18. Then, the operator in the control room controls the transverse movement mechanism, the longitudinal movement mechanism and the rotation mechanism to move the position of the rotating frame 13 so that the laser emitted by the second laser 17 is directly facing the second positioning point on the second positioning plate 26, thereby completing the first positioning of the spreader;

[0048] Step C: The laser is emitted by the first laser 15, and the position image of the laser irradiation point is transmitted to the control room of the crane 3 in real time through the first camera 16. Then, the operator in the control room controls the linear mechanism to move the position of the slide 56 so that the laser emitted by the first laser 15 is directly facing the first positioning point on the first positioning plate 25, thereby completing the second positioning of the spreader;

[0049] Step D: After the second positioning in step C, the slide 56 is aligned with the groove 22 of the hook seat 21. Then the operator in the control room controls the electric hoist to lower the hoist so that the slide 56 is stuck in the groove 22. When the travel switch 63 touches the first positioning plate 25, the switch signal is transmitted to the control system in the control room. Then the control system controls the electric hoist to stop and controls the telescopic mechanism to extend the telescopic column 20 and stick it into the lifting hole 23 to form a lifting hole. Figure 6 In the state shown, the connection between the sling and the hanger 7 is completed, and then the sling is lifted by the electric hoist to lift the counterweight segment block 6. After the counterweight segment block 6 is suspended in the air, it is weighed by the crane scale 9. If the weight does not meet the loading requirement, a ton bag of the required weight is hung on the hook 57, and then the counterweight segment block 6 is lifted to a height of 100 to 300 mm from the ground by the electric hoist.

[0050] The specific structures of the transverse mechanism, longitudinal mechanism, rotation mechanism, linear mechanism and telescopic mechanism are as follows: the transverse mechanism includes a first motor 27, a first pulley 28, a first rack 29 and a first guide rail 30, the first rack 29 and the first guide rail 30 are fixedly mounted on the hanger 10, the first pulley 28 is movably mounted on the transverse frame 11, the transverse frame 11 is movably mounted on the first guide rail 30 through the first pulley 28, the first motor 27 is fixedly mounted on the transverse frame 11, and a first gear 31 is arranged on the output shaft of the first motor 27, and the first gear 31 is meshed with the first rack 29.

[0051] The longitudinal movement mechanism includes a second motor 32, a second pulley 33, a second rack 34 and a second guide rail 35. The second rack 34 and the second guide rail 35 are fixedly mounted on the transverse movement frame 11. The second pulley 33 is movably mounted on the longitudinal movement frame 12. The longitudinal movement frame 12 is movably mounted on the second guide rail 35 through the second pulley 33. The second motor 32 is fixedly mounted on the longitudinal movement frame 12. A second gear 36 is provided on the output shaft of the second motor 32. The second gear 36 is meshed with the second rack 34.

[0052] The rotating mechanism includes a third motor 37, and a rotating shaft 38 is arranged on the rotating frame 13. The rotating shaft 38 is movably mounted on the longitudinal moving frame 12 through a radial bearing 39 and a thrust bearing 40. The third motor 37 is fixedly mounted on the longitudinal moving frame 12, and a ring gear 41 is arranged on the rotating shaft 38. A driving gear 42 is arranged on the output shaft of the third motor 37, and the driving gear 42 is meshed with the ring gear 41.

[0053] The linear mechanism includes a support 43, a fourth motor 44 and a fourth screw 45. The support 43 is fixedly mounted on the rotating frame 13. A guide rod 51 is arranged on the support 43. A guide hole 52 is opened on the slide 14. The slide 14 is movably mounted on the guide rod 51 through the guide hole 52. A fourth screw hole 53 is opened on the slide 14. The fourth screw 45 is movably mounted on the support 43. The fourth screw 45 is threadedly connected to the fourth screw hole 53 of the slide 14. The fourth motor 44 is fixedly mounted on the support 43 and is transmission-connected to the fourth screw 45.

[0054] The telescopic mechanism includes a fifth motor 47, a worm wheel 49 and a worm 50. A slide groove 54 is provided inside the slide 14. The telescopic column 20 is movably inserted in the slide groove 54. A fifth screw hole 55 is provided on the telescopic column 20. The worm wheel 49 is movably installed in the slide 14. Fifth screws 56 with opposite thread rotation directions are respectively provided at both ends of the worm wheel 49. The fifth screw 56 is respectively threadedly connected with the fifth screw hole 55 of the telescopic column 20. The worm 50 is movably installed in the slide 14. The worm 50 is meshed with the worm wheel 49. The fifth motor 47 is fixedly installed in the slide 14 and is transmission-connected to the worm 50.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A new loading method for load test of segment assembly bridge erecting machine, characterized in that: The following steps are involved: Step 1: After all segment blocks (1) are evenly suspended by the segment assembly bridge erecting machine, a lowering space (5) for the hoisting device of the crane (3) is reserved at the mid-span position of the main frame (2) of the segment assembly bridge erecting machine, and a counterweight segment block (6) is placed on the ground below the lowering space (5); Step 2: Move the sling to the top of the lowering space (5) by means of the overhead crane (3), lower the sling so that it passes through the lowering space (5), and lift the counterweight segment block (6) by means of the sling to complete the loading of the load test of the segment assembly bridge erecting machine main frame (2); The sling comprises a lifting pulley (8), a hanging scale (9), a hanging frame (10), a transverse frame (11), a longitudinal frame (12), a rotating frame (13), a pair of slides (14), a pair of telescopic columns (20), a first laser (15), a first camera (16), an LED lamp (19), a travel switch (63), a second laser (17) and a second camera (18); the lifting pulley (8) is connected to an electric hoist of a lifting crane (3) via a steel wire rope (58); the upper end of the hanging scale (9) is fixedly connected to the lifting pulley (8); the lower end of the hanging scale (9) is fixedly connected to the hanging frame (10); the transverse frame (11) is movably mounted on the lifting frame via a transverse mechanism. The longitudinal moving frame (12) is movably mounted on the transverse moving frame (11) via a longitudinal moving mechanism, the rotating frame (13) is movably mounted on the longitudinal moving frame (12) via a rotating mechanism, the pair of slides (14) are movably mounted on the rotating frame (13) via a linear mechanism, the pair of telescopic columns (20) are movably mounted on the slides (14) via a telescopic mechanism, the first laser (15), the first camera (16), the LED light (19) and the travel switch (63) are respectively fixedly mounted on the lower end of the slide (14), and the second laser (17) and the second camera (18) are respectively fixedly mounted on the rotating frame (13).

2. A new loading method for load test of segment assembly bridge erecting machine as claimed in claim 1, characterized in that: In the step 1, by staggering the segment blocks (1) up and down, a space (5) for lowering the hoisting device of the crane crane (3) is reserved at the mid-span position of the main frame (2) of the segment assembly bridge erecting machine.

3. A new loading method for load test of segment assembly bridge erecting machine as claimed in claim 1, characterized in that: In step 2, the method of lifting the counterweight segment block (6) by means of a lifting device comprises the following steps: Step A: symmetrically arranged hooks (57) are provided on the counterweight segment block (6), a hanger (7) for lifting with a sling is pre-fixed on the counterweight segment block (6), symmetrically arranged hanging seats (21) are provided on the hanger (7), a groove (22) corresponding to the slide seat (14) is provided on the hanging seat (21), a lifting hole (23) corresponding to the telescopic column (20) is provided on the side wall of the groove (22), a first positioning plate (25) is provided on the bottom wall of the groove (22), a first positioning point corresponding to the first laser (15) is marked on the first positioning plate (25), a second positioning plate (26) is provided on the hanger (7), and a second positioning point corresponding to the second laser (17) is marked on the second positioning plate (26); Step B: lowering the sling to a height close to the hanger (7) by means of the electric hoist of the overhead crane (3), then emitting laser light through the second laser (17), and transmitting the position image of the laser irradiation point to the control room of the overhead crane (3) in real time through the second camera (18), and then the operator in the control room controls the transverse movement mechanism, the longitudinal movement mechanism and the rotation mechanism to move the position of the rotating frame (13) so that the laser light emitted by the second laser (17) faces the second positioning point on the second positioning plate (26), thereby completing the first positioning of the sling; Step C: The laser is emitted by the first laser (15), and the position image of the laser irradiation point is transmitted in real time to the control room of the crane (3) through the first camera (16). Then, the operator in the control room controls the linear mechanism to move the position of the slide (14) so ​​that the laser emitted by the first laser (15) faces the first positioning point on the first positioning plate (25), thereby completing the second positioning of the sling; Step D: After the second positioning in step C, the slide (14) is aligned with the groove (22) of the hook seat (21). Then, the operator in the control room controls the electric hoist to lower the sling so that the slide (14) is inserted into the groove (22). When the travel switch (63) touches the first positioning plate (25), the switch signal is transmitted to the control system in the control room. Then, the control system controls the electric hoist to stop and controls the telescopic mechanism to extend the telescopic column (20) and insert it into the lifting hole (23), thereby completing the connection between the sling and the hanger (7). Then, the sling is lifted by the electric hoist to lift the counterweight segment block (6). After the counterweight segment block (6) is suspended in the air, it is weighed by the crane scale (9). If the weight does not meet the loading requirement, a ton bag of the required weight is hung on the hook (57), and then the counterweight segment block (6) is lifted to a height of 100 to 300 mm from the ground by the electric hoist.

4. A new loading method for load test of segment assembly bridge erecting machine as claimed in claim 3, characterized in that: The transverse movement mechanism comprises a first motor (27), a first pulley (28), a first rack (29) and a first guide rail (30); the first rack (29) and the first guide rail (30) are fixedly mounted on the hanger (10); the first pulley (28) is movably mounted on the transverse movement frame (11); the transverse movement frame (11) is movably mounted on the first guide rail (30) via the first pulley (28); the first motor (27) is fixedly mounted on the transverse movement frame (11); a first gear (31) is arranged on the output shaft of the first motor (27); and the first gear (31) is meshed with the first rack (29).

5. A new loading method for load test of segment assembly bridge erecting machine as claimed in claim 3, characterized in that: The longitudinal movement mechanism comprises a second motor (32), a second pulley (33), a second rack (34) and a second guide rail (35); the second rack (34) and the second guide rail (35) are fixedly mounted on the transverse movement frame (11); the second pulley (33) is movably mounted on the longitudinal movement frame (12); the longitudinal movement frame (12) is movably mounted on the second guide rail (35) via the second pulley (33); the second motor (32) is fixedly mounted on the longitudinal movement frame (12); a second gear (36) is arranged on the output shaft of the second motor (32); and the second gear (36) is meshed with the second rack (34).

6. A new loading method for load test of segment assembly bridge erecting machine as claimed in claim 3, characterized in that: The rotating mechanism comprises a third motor (37), a rotating shaft (38) is arranged on the rotating frame (13), the rotating shaft (38) is movably mounted on the longitudinal moving frame (12), the third motor (37) is fixedly mounted on the longitudinal moving frame (12), a gear ring (41) is arranged on the rotating shaft (38), and a driving gear (42) is arranged on the output shaft of the third motor (37), and the driving gear (42) is meshed with the gear ring (41).

7. A new loading method for load test of segment assembly bridge erecting machine as claimed in claim 3, characterized in that: The linear mechanism comprises a support (43), a fourth motor (44) and a fourth screw (45), wherein the support (43) is fixedly mounted on the rotating frame (13), a guide rod (51) is arranged on the support (43), a guide hole (52) is provided on the slide (14), the slide (14) is movably sleeved on the guide rod (51) through the guide hole (52), a fourth screw hole (53) is provided on the slide (14), the fourth screw (45) is movably mounted on the support (43), the fourth screw (45) is threadedly connected to the fourth screw hole (53) of the slide (14), and the fourth motor (44) is fixedly mounted on the support (43) and is drivingly connected to the fourth screw (45).

8. A new loading method for load test of segment assembly bridge erecting machine as claimed in claim 3, characterized in that: The telescopic mechanism comprises a fifth motor (47), a worm wheel (49) and a worm (50). A slide groove (54) is provided inside the slide seat (14). The telescopic column (20) is movably inserted into the slide groove (54). A fifth screw hole (55) is provided on the telescopic column (20). The worm wheel (49) is movably mounted in the slide seat (14). Fifth screws (56) with opposite thread rotation directions are respectively provided at two ends of the worm wheel (49). The fifth screws (56) are respectively threadedly connected to the fifth screw holes (55) of the telescopic column (20). The worm (50) is movably mounted in the slide seat (14). The worm (50) is meshed with the worm wheel (49). The fifth motor (47) is fixedly mounted in the slide seat (14) and is drivingly connected to the worm (50).

Images