Cross-channel steel box girder hoisting, assembling and hoisting device and construction technology thereof

Abstract

The invention discloses a channel-crossing steel box girder hoisting, assembling and hoisting device and a construction process thereof. The construction process comprises the following construction process steps: 1) carrying out a tension test; (2) assembling a lifting device; (3) moving and positioning the lifting device; (4) trial hoisting; 5) hoisting the steel box girder; (6) welding the steel box girder; (7) acceptance and follow-up work; the lifting device comprises a stabilizing device, a main truss system, a lifting system, an anchoring system and a walking system. The lifting system, the anchoring system and the walking system are all installed and connected to the main truss system, and the two ends of the step ladder are fixedly connected to the top and the bottom of the main truss system correspondingly. The stabilizing device is located on one side of the main truss system and fixedly connected with the bridge body. After the walking system drives the main truss system to move to the preset position, the main truss system is matched with the lifting system and the anchoring system to lift the steel box girder, meanwhile, the stabilizing device performs stable protection on the lifting system in the lifting process, and the situation that the stability of the lifting system for lifting the steel box girder is affected by external force is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and particularly relates to a hoisting device for hoisting and assembling a steel box girder across a waterway and a construction process thereof. Background Art

[0002] As an important waterway, the Grand Canal undertakes heavy shipping tasks. Therefore, when building a bridge across a waterway, it is necessary to accurately install a steel box girder weighing hundreds of tons without affecting the normal operation of the waterway or minimizing the impact on the normal operation of the waterway as much as possible.

[0003] After retrieval, a method for jacking construction of a long-span steel box girder bridge across a river with the publication number of CN119041315A in the prior art. In this method, the steel box girder is hoisted onto a support temporarily erected near the pier column by a hoisting device, and then the steel box girder is pushed to move on the support by an efficient walking jacking device, and an intelligent monitoring system is used to monitor the steel box girder to prevent the steel box girder from shifting; after the steel box girder is pushed to the corresponding position, the steel box girder is butt-jointed and fixed; however, the efficient walking jacking device will affect the normal navigation of the waterway when jacking the steel box girder.

[0004] After retrieval, a method for assembling a prefabricated steel box girder with the publication number of CN117188323A in the prior art; in this method, the assembled lifting support is driven by a walking mechanism to move forward to the construction position and the walking mechanism is fixed; then the distance between the lifting device and the end of the bridge deck is measured, and the suspension point is adjusted by relying on the base assembly at the top of the lifting support, and finally adjusted; a method for installing a gantry crane for a long-span public-rail double-deck steel box girder with the publication number of CN117646391A in the prior art; this method changes the water operation to land operation, extends the gantry crane foundation to the road bridge deck, and installs the sectional steel box girder by using the characteristic of the constant height of the gantry crane; however, the above two methods are prone to be affected by external forces when hoisting the steel box girder, causing the steel box girder to shake, resulting in damage to the hoisting equipment or the steel box girder breaking away from the hoisting equipment. Summary of the Invention

[0005] The purpose of the invention is to overcome the deficiencies in the prior art and provide a hoisting device for hoisting and assembling a steel box girder across a waterway and a construction process thereof. After the main truss system is driven by the walking system to move to a predetermined position, the main truss system cooperates with the lifting system and the anchoring system to hoist the steel box girder. At the same time, the stabilizing device stabilizes and protects the lifting system during the hoisting process to prevent external forces from affecting the stability of the lifting system for hoisting the steel box girder.

[0006] In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

[0007] A hoisting device for hoisting and assembling a steel box girder across a waterway and a construction process thereof, and the specific construction process steps are as follows:

[0008] 1) Tensile test: Assemble two sets of diamond trusses in the main truss system and place them flat on a wide and flat hardened site for tensile test; after the test, inspect the appearance of the main truss components to see if there are any weld cracks, bolt failures, etc., and analyze the test data to determine that the diamond trusses meet the construction conditions. After acceptance by the supervision unit, they will be put into operation;

[0009] 2) Assembly of the lifting device: first install the stabilizing device on the 0# block of the bridge body, then transport the diamond trusses that have undergone the tension test to the 0# block of the bridge body, and install other components of the main truss system on the two sets of diamond trusses; at the same time, install two sets of walking systems at the bottom of the main truss system, and fix the main truss system to the bridge body through two sets of anchoring systems; finally, install the lifting system to the top of the main truss system; the structure after the overall device is assembled is as shown in the attached figure. Figure 1 As shown;

[0010] 3) Lifting device movement and positioning: loosen the anchoring system, drive the main truss system to move to the predetermined position through the walking system, and re-fix the main truss system through the anchoring system;

[0011] 4) Trial lifting: transport the steel box girder to the bottom of the bridge body by transport ship, and locate the position of the transport ship by GPS to ensure that the steel box girder is aligned with the lifting position; after the lifting system is fixedly connected to the steel box girder, the lifting system controls the steel box girder to rise to 15cm from the transport ship, and let it stand for 5 minutes to check the deformation and stability of the lifting device;

[0012] 5) Steel box girder hoisting: The steel box girder is slowly lifted to 75cm above the design elevation through the lifting system, accurately placed after adjusting the plane, and connected through temporary supports or bolts to ensure that wind resistance and anti-slip measures are in place; while the lifting system hoists the steel box girder, the stabilizing device assists the lifting system in hoisting the steel box girder to prevent the lifting system and the steel box girder from shaking due to external forces during the lifting process;

[0013] 6) Steel box girder welding: After the lifting system hoists the steel box girder into place, control the welding equipment to weld the two ends of the steel box girder to the 0# block of the bridge body in the order of web plate first and top and bottom plates later; and stop welding when the humidity is greater than 80%, and the welds after welding need to be 100% ultrasonically tested;

[0014] 7) Acceptance and follow-up work: After the lifting and welding of the steel box girder, re-measure the line shape, submit it to the supervisor for acceptance, remove the lifting device, and clear the obstacles in the waterway.

[0015] The lifting device described in the above process steps includes a stabilizing device, a main truss system, a lifting system, an anchoring system, and a traveling system; the main truss system is fixedly connected to the bridge body through two groups of anchoring systems, and the lifting system is arranged on the top of the main truss system; there are two groups of traveling systems, which are respectively fixedly connected to the main truss system on both sides of the two groups of anchoring systems, and one end of the ladder is fixedly connected to the bottom of the main truss system between the anchoring system and the traveling system, and the other end is fixedly connected to the top of the main truss system; the stabilizing device is fixedly connected to the bridge body on one side of the main truss system.

[0016] The stabilizing device includes a connecting beam, a connecting plate, a guiding column, a fixed beam, a threaded steel bar I, a supporting mechanism, a displacement mechanism, and a stabilizing mechanism; the connecting beam is arranged above the bridge body, and the tops of several threaded steel bar Is are respectively fixedly connected to both sides of the supporting mechanism through high-strength bolts, and the bottoms respectively pass through the through holes on both sides of the connecting beam and the embedded hole channels on both sides of the bridge body and are fixedly connected to the fixed beam arranged below the bridge body through high-strength bolts; the guiding column is arranged on one side of the connecting beam, and one ends of several connecting plates are fixedly connected to one side of the guiding column at equal intervals, and the other ends are fixedly connected to the threaded rod on one side of the connecting beam through nuts; there are two groups of displacement mechanisms, the top and bottom of the displacement mechanism are respectively slidably connected to the supporting mechanism and the guiding column, and two groups of stabilizing mechanisms are respectively arranged on the two groups of displacement mechanisms.

[0017] The supporting mechanism includes a connecting frame I, a supporting column, and a hydraulic cylinder I; there are two groups of supporting columns, symmetrically arranged on both sides of the connecting beam, and the top of the threaded steel bar I is fixedly connected to the connecting seat at the bottom of the supporting column through a high-strength bolt; there are several hydraulic cylinders I, and the cylinders of several hydraulic cylinders I are respectively fixedly connected to both sides of the supporting column, and the extending ends are fixedly connected to the connecting frame I with a connecting groove at the top.

[0018] The displacement mechanism includes a sliding seat, a connecting groove, a fixing plate I, a fixing plate II, a moving trolley, a hydraulic motor I, a connecting shell, a hydraulic cylinder II, a lifting box, a hydraulic cylinder IV, and a sliding plate; the top and bottom of the sliding seat are respectively provided with a fixing plate I and a fixing plate II, and one end of the sliding seat is slidably connected to the connecting frame I through a connecting groove; the moving trolley is arranged on the guiding column, and the bottom of the connecting shell is fixedly connected to one side of the moving trolley, and the hydraulic motor I is fixedly connected to the other side of the moving trolley through a connecting seat; the bottom of the lifting box is slidably connected to the connecting shell, and the connecting box at the top is slidably connected to the outside of the sliding seat; the cylinder of the hydraulic cylinder II is fixedly connected to the inner side of the connecting shell, and the extending end passes through the lifting box and is fixedly connected to the fixing plate II; the cylinder of the hydraulic cylinder IV is fixedly connected to the fixing plate I through a connecting seat, and the extending end is fixedly connected to the sliding plate slidably connected to the outside of the sliding seat and the fixing plate I, and the bottom of the sliding plate is slidably connected to the connecting groove on the connecting frame I.

[0019] The stability mechanism is provided with a protective box I, an external thread cylinder, a protective box II, a threaded rod, a rotating seat I, a rotating seat II, a rotating seat III, a hydraulic motor II, and a hydraulic motor III; the rotating seat I and the rotating seat III are rotatably connected to the sliding seat, the top of the rotating seat I is arranged in the through hole on the fixed plate I, the bottom of the rotating seat III is arranged in the through hole on the fixed plate II, and several tooth grooves are arranged at the bottom of the rotating seat III; the hydraulic motor II and the hydraulic motor III are fixedly connected to the connecting seat above the fixed plate I, and the gear on the output end of the hydraulic motor II passes through the through groove on one side of the sliding seat and meshes with the teeth on the outer wall of the rotating seat I, and the gear on the output end of the hydraulic motor III passes through the through groove on the other side of the sliding seat and meshes with the teeth on the outer wall of the rotating seat III; the protective box I is slidably connected to the connecting grooves on the sliding seat, the fixed plate I and the fixed plate II, and several through holes are arranged at the top of the protective box I; the external thread cylinder is threadedly connected to the rotating seat I, the top of the external thread cylinder is fixedly connected to the top of the protective box I through the connecting seat, the bottom passes through the through hole on the rotating seat III and is rotatably connected to the rotating seat II with several clamping teeth at the top, and the rotating seat II is rotatably connected to the connecting seat at the bottom of the rotating seat II; the top of the protective box II is slidably connected to the bottom of the protective box I, and the positions of several through holes at the bottom of the protective box II correspond to the through holes at the top of the protective box I; the threaded rod is threadedly connected to the rotating seat II, and the top of the threaded rod is slidably connected to the external thread cylinder, and the bottom is fixedly connected to the bottom of the protective box II through the connecting seat.

[0020] The main truss system includes a diamond truss, a rear node, a support rod, a diagonal brace I, a diagonal brace II, a cross beam, and a connecting frame II; there are two groups of diamond trusses, several groups of diagonal braces II are connected to the diamond trusses by pins, and the diagonal brace I on one side of the diamond truss is connected to the rear node at the bottom of the diamond truss by a pin; there are several cross beams, and both ends of the several cross beams are fixedly connected to the two groups of diamond trusses by high-strength bolts; there are two groups of connecting frames II, and both ends of the two groups of connecting frames II are symmetrically and fixedly connected to both sides of the support rod.

[0021] The lifting system includes a hydraulic numerical control pump station, a rear beam of the platform, hydraulic cylinder III, a front beam of the platform, a flat connecting frame, a guiding frame, connecting rod I, a cable reel, a lifting jack, a steel wire rope, a lug anchor head, and lug I; the rear beam of the platform and the front beam of the platform are slidably connected above the diamond truss, both ends of the flat connecting frame are fixedly connected to the rear beam of the platform and the front beam of the platform respectively, and the cylinder bodies of the two groups of hydraulic cylinder III are respectively rotatably connected to the connecting seats fixedly connected to the tops of the two groups of diamond trusses, and the extending ends are respectively fixedly connected to both ends of the rear beam of the platform; there are two groups of lifting jacks, guiding frames, and cable reels respectively, which are fixedly connected above the two pairs of connecting rod I in sequence, and the two pairs of connecting rod I are respectively fixedly connected to both ends of the rear beam of the platform and the front beam of the platform; one end of the steel wire rope passes through the through holes on the protection box I and the protection box II and is fixedly connected to the top of the lug anchor head, the other end passes through the lifting jack and the guiding frame and is fixedly connected to the cable reel, and the bottom of the lug anchor head is connected to lug I fixedly connected to the steel box girder through a pin shaft; the hydraulic numerical control pump station is located on one side of the stairway and is fixedly connected to a pair of cross beams at the top of the diamond truss.

[0022] The anchoring system includes a rear anchoring beam, double - channel steel, steel structure anchor rods, lug II, and deformed steel bar II; the rear anchoring beam is arranged above the rear node, the two groups of steel structure anchor rods are respectively arranged on both sides of the rear node, and the top of the steel structure anchor rod is fixedly connected to the rear anchoring beam, and the bottom is connected to lug II through a pin shaft; there are several deformed steel bar II, and the tops of several deformed steel bar II are fixedly connected to lug II through nuts, and the bottoms pass through the embedded holes in the bridge body and are fixedly connected to the double - channel steel fitting the bottom surface of the bridge body through nuts.

[0023] The traveling system includes rails, traveling oil jacks, traveling trolleys, connecting rod II, connecting rod I, and connecting rod II; the rails are arranged below the diamond truss, and the cylinder body of the traveling oil jack is rotatably connected to the connecting seat fixedly connected to the rails, and the extending end is rotatably connected to the diamond truss; there are two groups of traveling trolleys, which are respectively fixedly connected to the rear nodes on the two groups of diamond trusses through high - strength bolts, and connecting rod II is located above the traveling oil jack and is fixedly connected to the diamond truss; there is a pair of connecting rod I, connecting rod I is slidably connected to the connecting seat at one end of the rail, and one end of connecting rod I is connected to each other through a pin shaft, and the other end is rotatably connected to the sliding seat; there is a pair of connecting rod II, one end of connecting rod II is rotatably connected to the rail, the other end is slidably connected to connecting rod II through a pin shaft, and one side of connecting rod II is slidably connected to the sliding seat on connecting rod I.

[0024] The beneficial effects of the present invention compared with the prior art are as follows:

[0025] 1) When using the lifting device to hoist the steel box girder, there is no need to interrupt traffic, which can effectively reduce the impact of construction on the surrounding environment and traffic, and is especially suitable for projects with high requirements for the environment and traffic such as urban bridge construction.

[0026] 2) The stabilizing device is linked through a multi-stage mechanism to control the stabilizing mechanism to move along with the steel wire rope in the hoisting system, thereby providing real-time protection for the steel wire rope, ensuring the stability of the hoisting system for hoisting the steel box girder, and preventing the steel box girder from swaying caused by external forces and resulting in the steel box girder detaching from the hoisting system;

[0027] 3) The lifting jacks in the hoisting system cooperate with the guiding frame and the wire rope retractor to achieve the correct guiding and safe recycling of the steel strands during the hoisting process;

[0028] 4) By installing the double-joined section steel in the anchoring system at the bottom of the cantilever casting beam for reverse anchoring, in this way, the double-joined section steel firmly combines the lifting device with the concrete cantilever casting beam into a whole, enabling the lifting device to stably hoist the steel box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. Figure 1 is a schematic structural diagram of a steel box girder hoisting and assembling lifting device and its construction process according to the present invention;

[0030] FIG. Figure 2 is FIG. Figure 1 a schematic structural diagram of the stabilizing device in FIG.

[0031] FIG. Figure 3 is FIG. Figure 1 a schematic structural diagram of the support mechanism in FIG.

[0032] FIG. Figure 4 is FIG. Figure 1 a schematic structural diagram of the displacement mechanism in FIG.

[0033] FIG. Figure 5 is FIG. Figure 1 a schematic connection structure diagram of the stabilizing mechanism and the displacement mechanism in FIG.

[0034] FIG. Figure 6 is FIG. Figure 1 a schematic connection structure diagram of the stabilizing mechanism and the sliding seat in FIG.

[0035] FIG. Figure 7 is FIG. Figure 1 a schematic structural diagram of the stabilizing mechanism in FIG.

[0036] FIG. Figure 8 is FIG. Figure 1 a schematic sectional structure diagram of the stabilizing mechanism in FIG.

[0037] FIG. Figure 9 is FIG. Figure 1 a schematic structural diagram of the main truss system in FIG.

[0038] FIG. Figure 10 is FIG. Figure 1 a schematic structural diagram of the diamond truss in FIG.

[0039] Appendix Figure 11 is the structural schematic diagram of the anchoring system in Figure 1 ;

[0040] Appendix Figure 12 is the structural schematic diagram of the connection between the rear beam and the front beam of the platform in Figure 1 ;

[0041] Appendix Figure 13 is the structural schematic diagram of the hoisting system in Figure 1 ;

[0042] Appendix Figure 14 is the structural schematic diagram of the connection between the hoisting system and the steel box girder in Figure 1 ;

[0043] Appendix Figure 15 is the structural schematic diagram of the traveling system in Figure 1 ;

[0044] In the figure: 1. Stabilizing device; 101. Connecting beam; 1011. Connecting plate; 102. Guide column; 103. Fixed beam; 104. Rebar Ⅰ; 105. Support mechanism; 1051. Connecting frame Ⅰ; 1052. Support column; 1053. Hydraulic cylinder Ⅰ; 106. Displacement mechanism; 1061. Sliding seat; 1062. Connecting groove; 1063. Fixed plate Ⅰ; 1064. Fixed plate Ⅱ; 1065. Moving trolley; 1066. Hydraulic motor Ⅰ; 1067. Connecting shell; 1068. Hydraulic cylinder Ⅱ; 1069. Lifting box; 107. Stabilizing mechanism; 1071. Protection box Ⅰ; 1072. External threaded cylinder; 1073. Protection box Ⅱ; 1074. Threaded rod; 1075. Rotating seat Ⅰ; 1076. Rotating seat Ⅱ; 1077. Rotating seat Ⅲ; 1078. Hydraulic motor Ⅱ; 1079. Hydraulic motor Ⅲ; 108. Hydraulic cylinder Ⅳ; 1081. Sliding plate;

[0045] 2. Main truss system; 201. Diamond truss; 2011. Rear node; 2012. Support rod; 2013. Diagonal brace Ⅰ; 2014. Diagonal brace Ⅱ; 202. Cross beam; 203. Connecting frame Ⅱ; 3. Hoisting system; 301. Hydraulic numerical control pump station; 302. Rear beam of the platform; 3021. Hydraulic cylinder Ⅲ; 303. Front beam of the platform; 3031. Horizontal connecting frame; 304. Guide frame; 305. Connecting rod Ⅰ; 306. Cable reel; 307. Lifting jack; 3071. Steel wire rope; 308. Hoisting lug anchor head; 309. Hoisting lug Ⅰ; 4. Anchoring system; 401. Rear anchoring beam; 402. Double-rolled steel; 403. Steel structure anchor rod; 404. Hoisting lug Ⅱ; 405. Rebar Ⅱ; 5. Traveling system; 501. Rail; 502. Traveling oil jack; 503. Traveling trolley; 504. Connecting rod Ⅱ; 505. Link Ⅰ; 506. Link Ⅱ; 6. Stairway; 7. Bridge body; 8. Steel box girder. Specific implementation mode

[0046] For the convenience of understanding by those skilled in the art, the technical solutions of the present invention will be further specifically described below in conjunction with the attached Figure 1-15 , and the technical solutions of the present invention will be further specifically described below in conjunction with the attached drawings.

[0047] A hoisting device for hoisting and assembling a steel box girder across a waterway and its construction process are as follows:

[0048] 1) Tensile test: Assemble two groups of diamond trusses 201 in the main truss system 2, and place the assembled two groups of diamond trusses 201 flat on a broad, flat and hardened site for the tensile test; after the test, check the appearance of the main truss members to see if there are any weld cracks, bolt breakages, etc., and analyze the test data to determine that the diamond truss 201 meets the construction working condition requirements, and then enter the site for implementation after being accepted by the supervision unit;

[0049] 2) Hoisting device assembly: First, install the stabilizing device 1 on the 0# block of the bridge body 7, then transport the diamond truss 201 that has passed the tensile test to the 0# block of the bridge body 7, and install other components in the main truss system 2 on the two groups of diamond trusses 201; at the same time, install the two groups of traveling systems 5 at the bottom of the main truss system 2, and fixedly connect the main truss system 2 with the bridge body 7 through the two groups of anchoring systems 4; finally, install the lifting system 3 on the top of the main truss system 2; the structure after the overall device is assembled is as shown in the attached Figure 1 figure;

[0050] 3) Hoisting device movement and positioning: Loosen the anchoring system 4, drive the overall device to move to the predetermined position through the traveling system 5, and fixedly connect the main truss system 2 again through the anchoring system 4;

[0051] 4) Trial hoisting: Transport the steel box girder 8 to below the bridge body 7 through a transport ship, and position the transport ship through GPS to ensure that the steel box girder 8 is aligned with the hoisting position; after fixedly connecting the lifting system 3 with the steel box girder 8, the lifting system 3 controls the steel box girder 8 to rise to 15 cm above the transport ship and stand still for 5 minutes to check the deformation and stability of the hoisting device;

[0052] 5) Steel box girder hoisting: Slowly lift the steel box girder 8 to 75 cm above the design elevation through the lifting system 3, adjust the plane and then accurately place it in position, and ensure the anti-wind and anti-slip measures are in place through temporary supports or bolt connections; while the lifting system 3 hoists the steel box girder 8, the stabilizing device 1 assists the lifting system 3 to hoist the steel box girder 8 to prevent the lifting system 3 and the steel box girder 8 from shaking due to external forces during the hoisting process;

[0053] 6) Steel box girder welding: After the lifting system 3 hoists the steel box girder 8 into place, the welding equipment is controlled to weld the two ends of the steel box girder 8 to the 0# block of the bridge body 7 in the order of the web plate first and the top and bottom plates later; and the welding is stopped when the humidity is greater than 80%, and the welds after welding need to be subjected to 100% ultrasonic testing;

[0054] 7) Acceptance and follow-up work: After the lifting and welding of the steel box girder 8 are completed, the line shape is re-measured, submitted to the supervisor for acceptance, and the lifting device is removed and the obstacles in the waterway are cleared.

[0055] The lifting device described in the above process steps includes a stabilizing device 1, a main truss system 2, a lifting system 3, an anchoring system 4, and a walking system 5; the main truss system 2 is fixedly connected to the bridge body 7 through two groups of anchoring systems 4, and the lifting system 3 is arranged on the top of the main truss system 2; the walking system 5 has two groups, which are respectively located on both sides of the two groups of anchoring systems 4 and fixedly connected to the main truss system 2, and one end of the step ladder 6 is located between the anchoring system 4 and the walking system 5 and fixedly connected to the bottom of the main truss system 2, and the other end is fixedly connected to the top of the main truss system 2; the stabilizing device 1 is located on one side of the main truss system 2 and fixedly connected to the bridge body 7;

[0056] The stabilizing device 1 comprises a connecting beam 101, a connecting plate 1011, a guide column 102, a fixed beam 103, a threaded steel bar Ⅰ104, a supporting mechanism 105, a displacement mechanism 106, and a stabilizing mechanism 107; the connecting beam 101 is arranged above the bridge body 7, and the top ends of a plurality of threaded steel bars Ⅰ104 are fixedly connected to the two sides of the supporting mechanism 105 by high-strength bolts, and the bottom ends pass through the through holes on the two sides of the connecting beam 101 and the embedded channels on the two sides of the bridge body 7 and are fixedly connected to the fixed beam 103 arranged below the bridge body 7 by high-strength bolts; the guide column 102 is arranged on one side of the connecting beam 101, and one end of a plurality of connecting plates 1011 is fixedly connected to the one side of the guide column 102 at an equal distance, and the other end is fixedly connected to the threaded rod on one side of the connecting beam 101 by a nut; the displacement mechanism 106 is provided with two groups, and the top and bottom of the displacement mechanism 106 are slidably connected to the supporting mechanism 105 and the guide column 102, respectively, and two groups of stabilizing mechanisms 107 are respectively arranged on the two groups of displacement mechanisms 106.

[0057] The support mechanism 105 is provided with a connecting frame Ⅰ1051, a supporting column 1052, and a hydraulic cylinder Ⅰ1053; the supporting column 1052 is provided with two groups, which are symmetrically arranged on both sides of the connecting beam 101, and the top of the threaded steel bar Ⅰ104 is fixedly connected to the connecting seat at the bottom of the supporting column 1052 by high-strength bolts; the hydraulic cylinder Ⅰ1053 is provided with a plurality of them, and the cylinder bodies of the plurality of hydraulic cylinders Ⅰ1053 are respectively fixedly connected to both sides of the supporting column 1052, and the protruding ends are fixedly connected to the connecting frame Ⅰ1051 with a connecting groove on the top.

[0058] The displacement mechanism 106 is provided with a sliding seat 1061, a connecting groove 1062, a fixing plate I 1063, a fixing plate II 1064, a moving trolley 1065, a hydraulic motor I 1066, a connecting shell 1067, a hydraulic cylinder II 1068, a lifting box 1069, a hydraulic cylinder IV 108, and a sliding plate 1081. A fixing plate I 1063 and a fixing plate II 1064 are respectively arranged at the top and bottom of the sliding seat 1061, and one end of the sliding seat 1061 is slidably connected to the connecting frame I 1051 through the connecting groove 1062. The moving trolley 1065 is arranged on the guiding column 102, and the bottom of the connecting shell 1067 is fixedly connected to one side of the moving trolley 1065. The hydraulic motor I 1066 is fixedly connected to the other side of the moving trolley 1065 through a connecting seat. The bottom of the lifting box 1069 is slidably connected to the connecting shell 1067, and the connecting box at the top is slidably connected to the outside of the sliding seat 1061. The cylinder body of the hydraulic cylinder II 1068 is fixedly connected to the inner side of the connecting shell 1067, and the extending end passes through the lifting box 1069 and is fixedly connected to the fixing plate II 1064. The cylinder body of the hydraulic cylinder IV 108 is fixedly connected to the fixing plate I 1063 through a connecting seat, and the extending end is fixedly connected to the sliding plate 1081 which is slidably connected to the outside of the sliding seat 1061 and the fixing plate I 1063. The bottom of the sliding plate 1081 is slidably connected to the connecting groove on the connecting frame I 1051.

[0059] The stabilizing mechanism 107 is provided with a protective box I 1071, an external thread cylinder 1072, a protective box II 1073, a threaded rod 1074, a rotating seat I 1075, a rotating seat II 1076, a rotating seat III 1077, a hydraulic motor II 1078, and a hydraulic motor III 1079. The rotating seat I 1075 and the rotating seat III 1077 are rotatably connected to the sliding seat 1061. The top of the rotating seat I 1075 is arranged in a through hole on the fixed plate I 1063, and the bottom of the rotating seat III 1077 is arranged in a through hole on the fixed plate II 1064. The bottom of the rotating seat III 1077 is provided with a plurality of tooth grooves. The hydraulic motor II 1078 and the hydraulic motor III 1079 are fixedly connected to a connecting seat above the fixed plate I 1063. The gear on the output end of the hydraulic motor II 1078 passes through a through groove on one side of the sliding seat 1061 and meshes with the teeth on the outer wall of the rotating seat I 1075. The gear on the output end of the hydraulic motor III 1079 passes through a through groove on the other side of the sliding seat 1061 and meshes with the teeth on the outer wall of the rotating seat III 1077. The protective box I 1071 is slidably connected to the connecting grooves on the sliding seat 1061, the fixed plate I 1063, and the fixed plate II 1064, and a plurality of through holes are arranged at the top of the protective box I 1071. The external thread cylinder 1072 is threadedly connected to the rotating seat I 1075. The top of the external thread cylinder 1072 is fixedly connected to the top of the protective box I 1071 through a connecting seat, and the bottom passes through a through hole on the rotating seat III 1077 and is rotatably connected to a rotating seat II 1076 with a plurality of locking teeth at the top. The rotating seat II 1076 is rotatably connected to a connecting seat at the bottom of the rotating seat II 1076. The top of the protective box II 1073 is slidably connected to the bottom of the protective box I 1071, and the positions of a plurality of through holes at the bottom of the protective box II 1073 correspond to those of the through holes at the top of the protective box I 1071. The threaded rod 1074 is threadedly connected to the rotating seat II 1076, and the top of the threaded rod 1074 is slidably connected to the external thread cylinder 1072, and the bottom is fixedly connected to the bottom of the protective box II 1073 through a connecting seat.

[0060] The main truss system 2 includes a diamond truss 201, a rear node 2011, a support rod 2012, a diagonal brace I 2013, a diagonal brace II 2014, a cross beam 202, and a connecting frame II 203. There are two groups of diamond trusses 201. A plurality of groups of diagonal braces II 2014 are connected to the diamond truss 201 by pins. One side of the diamond truss 201 is connected to the rear node 2011 at the bottom of the diamond truss 201 by a diagonal brace I 2013. There are a plurality of cross beams 202, and both ends of the plurality of cross beams 202 are fixedly connected to the two groups of diamond trusses 201 by high-strength bolts. There are two groups of connecting frames II 203, and both ends of the two groups of connecting frames II 203 are symmetrically and fixedly connected to both sides of the support rod 2012.

[0061] The lifting system 3 includes a hydraulic numerical control pump station 301, a rear platform beam 302, a hydraulic cylinder III 3021, a front platform beam 303, a flat connecting frame 3031, a guiding frame 304, a connecting rod I 305, a cable take-up device 306, a lifting jack 307, a steel wire rope 3071, a lifting lug anchor head 308, and a lifting lug I 309. The rear platform beam 302 and the front platform beam 303 are slidably connected above the diamond truss 201. Both ends of the flat connecting frame 3031 are fixedly connected to the rear platform beam 302 and the front platform beam 303 respectively. The cylinder bodies of the two groups of hydraulic cylinders III 3021 are rotatably connected to the connecting seats fixedly connected to the tops of the two groups of diamond trusses 201, and the extending ends are fixedly connected to both ends of the rear platform beam 302 respectively. There are two groups of the lifting jack 307, the guiding frame 304, and the cable take-up device 306, which are sequentially and fixedly connected above the two pairs of connecting rods I 305 respectively. The two pairs of connecting rods I 305 are fixedly connected to both ends of the rear platform beam 302 and the front platform beam 303 respectively. One end of the steel wire rope 3071 passes through the through holes in the protective box I 1071 and the protective box II 1073 and is fixedly connected to the top of the lifting lug anchor head 308, and the other end passes through the lifting jack 307 and the guiding frame 304 and is fixedly connected to the cable take-up device 306. The bottom of the lifting lug anchor head 308 is connected to the lifting lug I 309 fixedly connected to the steel box girder 8 through a pin shaft. The hydraulic numerical control pump station 301 is located on one side of the stairway 6 and is fixedly connected to a pair of cross beams 202 at the top of the diamond truss 201.

[0062] The anchoring system 4 includes a rear anchoring beam 401, double-rolled steel 402, steel structure anchor rods 403, lifting lugs II 404, and deformed steel bars II 405. The rear anchoring beam 401 is arranged above the rear node 2011. The two groups of steel structure anchor rods 403 are respectively arranged on both sides of the rear node 2011. The top of the steel structure anchor rod 403 is fixedly connected to the rear anchoring beam 401, and the bottom is connected to the lifting lug II 404 through a pin shaft. There are several deformed steel bars II 405. The tops of the several deformed steel bars II 405 are fixedly connected to the lifting lug II 404 through nuts, and the bottoms pass through the embedded holes in the bridge body 7 and are fixedly connected to the double-rolled steel 402 attached to the bottom surface of the bridge body 7 through nuts.

[0063] The walking system 5 includes a track 501, a walking oil jack 502, a walking trolley 503, a connecting rod II 504, a connecting rod I 505, and a connecting rod II 506. The track 501 is provided below the diamond truss 201. The cylinder block of the walking oil jack 502 is rotatably connected to a connecting seat fixedly connected to the track 501, and the extending end is rotatably connected to the diamond truss 201. There are two groups of walking trolleys 503, which are respectively fixedly connected to the rear nodes 2011 on the two groups of diamond trusses 201 by high-strength bolts. The connecting rod II 504 is located above the walking oil jack 502 and fixedly connected to the diamond truss 201. There is a pair of connecting rods I 505. The connecting rod I 505 is slidably connected to a connecting seat provided at one end of the track 501. One end of the connecting rod I 505 is connected to each other by a pin shaft, and the other end is rotatably connected to a sliding seat. There is a pair of connecting rods II 506. One end of the connecting rod II 506 is rotatably connected to the track 501, and the other end is slidably connected to the connecting rod II 504 by a pin shaft. One side of the connecting rod II 506 is slidably connected to the sliding seat on the connecting rod I 505.

[0064] A hoisting device for hoisting and assembling a steel box girder across a waterway and its construction technology are as follows:

[0065] Remove the nuts connected to the threaded steel II 405 in the anchoring system 4, so as to remove the double-rolled steel 402 and the lifting lug II 404 from the bridge body 7, thereby removing the fixing force applied by the rear anchoring beam 401 and the steel structure anchor rod 403 on the main truss system 2. Subsequently, drive the walking system 5 through the hydraulic system, use the walking oil jack 502 as the power source to drive the walking trolley 503 and the hoisting device as a whole to move. During the movement, a support oil jack is required to assist the hoisting device to move to ensure the stability of the hoisting device during the movement. After the hoisting device moves to the predetermined position, reinstall the anchoring system 4 back onto the main truss system 2 and the bridge body 7. After transporting the steel box girder 8 to the lower part of the bridge body 7 by a transport ship, the two sets of hydraulic cylinders III 3021 operate synchronously to control the platform rear beam 302 and the platform front beam 303 to slide along the top of the diamond truss 201 until the lifting lug anchor head 308 is aligned with the lifting lug I 309 fixedly connected to the steel box girder 8. Subsequently, fix the lifting lug anchor head 308 and the lifting lug I 309 together by a pin shaft. Subsequently, the lifting jack 307 cooperates with the guide frame 304 and the cable take-up device 306 to control the steel wire rope 3071 to lift the steel box girder 8.

[0066] While the hydraulic cylinder Ⅲ 3021 controls the movement of the rear beam 302 and the front beam 303 of the platform, the displacement mechanism 106 in the stabilizing device 1 controls the moving trolley 1065 through the hydraulic motor Ⅰ 1066 to drive the stabilizing mechanism 107 to move along the guide column 102. The hydraulic cylinder Ⅳ 108 cooperates with the sliding plate 1081 to drive the stabilizing mechanism 107 to extend or retract in a direction perpendicular to the guide column 102, so that the protective box Ⅰ 1071 and the protective box Ⅱ 1073 in the stabilizing mechanism 107 and the steel wire rope 3071 are always kept in a straight line. After the lug anchor head 308 is connected to the lug Ⅰ 309, the hydraulic cylinder Ⅰ 1053 in the support mechanism 105 and the hydraulic cylinder Ⅱ 1068 in the displacement mechanism 106 operate synchronously to control the sliding seat 1061 to drive the stabilizing mechanism 107 to descend. At the same time, the hydraulic motor Ⅱ 1078 controls the rotation seat Ⅰ 1075 to cooperate with the external thread cylinder 1072 to drive the protective box Ⅰ 1071 to descend, so that the bottom of the protective box Ⅱ 1073 is close to the top of the lug anchor head 308.

[0067] While the lifting system 3 lifts the steel box girder 8, the hydraulic motor Ⅱ 1078 controls the rotation seat Ⅰ 1075 to cooperate with the external thread cylinder 1072 to drive the protective box Ⅰ 1071 to rise until the teeth on the top of the rotation seat Ⅱ 1076 are engaged with the tooth grooves at the bottom of the rotation seat Ⅲ 1077. At this time, the lifting system 3 keeps running normally, the hydraulic motor Ⅱ 1078 is turned off, and the hydraulic motor Ⅲ 1079 is started to make the rotation seat Ⅲ 1077 drive the rotation seat Ⅱ 1076 to rotate, so that the threaded rod 1074 drives the protective box Ⅱ 1073 to rise and retract into the protective box Ⅰ 1071. At the same time, the hydraulic cylinder Ⅰ 1053 in the support mechanism 105 and the hydraulic cylinder Ⅱ 1068 in the displacement mechanism 106 operate synchronously to control the sliding seat 1061 to drive the stabilizing mechanism 107 to rise, preventing the top of the lug anchor head 308 from colliding with the bottom of the protective box Ⅱ 1073.

[0068] In summary, the electronic or electrical components such as hydraulic cylinders and hydraulic motors, including but not limited to, are components in the prior art, obtained through private customization or purchase. The connections between the components are all conventional connections in the prior art and are not within the scope of protection of the present invention.

[0069] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should fall within the scope of protection of the present invention.

Claims

1. A lifting device for assembling and assembling a steel box girder across a waterway and its construction process, characterized in that The specific construction process steps are as follows: 1) Tensile test: Assemble two sets of diamond trusses in the main truss system and place them flat on a wide and flat hardened site for tensile test; after the test, inspect the appearance of the main truss components to see if there are any weld cracks, bolt failures, etc., and analyze the test data to determine that the diamond trusses meet the construction conditions. After acceptance by the supervision unit, they will be put into operation; 2) Assembly of the lifting device: first install the stabilizing device on the 0# block of the bridge body, then transport the diamond trusses that have undergone the tension test to the 0# block of the bridge body, and install other components of the main truss system on the two sets of diamond trusses; at the same time, install two sets of walking systems at the bottom of the main truss system, and fix the main truss system to the bridge body through two sets of anchoring systems; finally, install the lifting system to the top of the main truss system; the structure of the overall device after assembly is shown in Figure 1; 3) Lifting device movement and positioning: loosen the anchoring system, drive the main truss system to move to the predetermined position through the walking system, and re-fix the main truss system through the anchoring system; 4) Trial lifting: transport the steel box girder to the bottom of the bridge body by transport ship, and locate the position of the transport ship by GPS to ensure that the steel box girder is aligned with the lifting position; after the lifting system is fixedly connected to the steel box girder, the lifting system controls the steel box girder to rise to 15cm from the transport ship, and let it stand for 5 minutes to check the deformation and stability of the lifting device; 5) Steel box girder hoisting: The steel box girder is slowly lifted to 75cm above the design elevation through the lifting system, accurately placed after adjusting the plane, and connected through temporary supports or bolts to ensure that wind resistance and anti-slip measures are in place; while the lifting system hoists the steel box girder, the stabilizing device assists the lifting system in hoisting the steel box girder to prevent the lifting system and the steel box girder from shaking due to external forces during the lifting process; 6) Steel box girder welding: After the lifting system hoists the steel box girder into place, control the welding equipment to weld the two ends of the steel box girder to the 0# block of the bridge body in the order of web plate first and top and bottom plates later; and stop welding when the humidity is greater than 80%, and the welds after welding need to be 100% ultrasonically tested; 7) Acceptance and follow-up work: After the lifting and welding of the steel box girder, re-measure the line shape, submit it to the supervisor for acceptance, remove the lifting device, and clear the obstacles in the waterway.

2. A lifting device for assembling and assembling a cross-channel steel box girder and its construction process according to claim 1, characterized in that The lifting device includes a stabilizing device, a main truss system, a lifting system, an anchoring system, and a walking system; the main truss system is fixedly connected to the bridge body through two sets of anchoring systems, and the lifting system is arranged on the top of the main truss system; the walking system is provided with two sets, which are respectively located on both sides of the two sets of anchoring systems and fixedly connected to the main truss system, and one end of the step ladder is located between the anchoring system and the walking system and fixedly connected to the bottom of the main truss system, and the other end is fixedly connected to the top of the main truss system; the stabilizing device is located on one side of the main truss system and fixedly connected to the bridge body; The stabilizing device comprises a connecting beam, a connecting plate, a guide column, a fixed beam, a threaded steel bar I, a supporting mechanism, a displacement mechanism and a stabilizing mechanism; the connecting beam is arranged above the bridge body, and the top ends of several threaded steel bars I are fixedly connected to the two sides of the supporting mechanism by high-strength bolts, and the bottom ends pass through the through holes on the two sides of the connecting beam and the embedded channels on the two sides of the bridge body and are fixedly connected to the fixed beam arranged below the bridge body by high-strength bolts; the guide column is arranged on one side of the connecting beam, and one end of several connecting plates is fixedly connected to the one side of the guide column at an equal distance, and the other end is fixedly connected to the threaded rod on one side of the connecting beam by a nut; the displacement mechanism is provided with two groups, and the top and bottom of the displacement mechanism are slidably connected to the supporting mechanism and the guide column respectively, and the two groups of stabilizing mechanisms are respectively arranged on the two groups of displacement mechanisms.

3. A lifting device for assembling and assembling a cross-channel steel box girder and its construction process according to claim 2, characterized in that The support mechanism is provided with a connecting frame I, a supporting column, and a hydraulic cylinder I; the supporting column is provided with two groups, which are symmetrically arranged on both sides of the connecting beam, and the top of the threaded steel bar I is fixedly connected to the connecting seat at the bottom of the supporting column by a high-strength bolt; the hydraulic cylinder I is provided with a plurality of them, and the cylinder bodies of the plurality of hydraulic cylinders I are respectively fixedly connected to both sides of the supporting column, and the protruding ends are fixedly connected to the connecting frame I with a connecting groove on the top.

4. A lifting device for assembling and assembling a cross-channel steel box girder and its construction process according to claim 2, characterized in that The displacement mechanism is provided with a sliding seat, a connecting groove, a fixed plate I, a fixed plate II, a moving trolley, a hydraulic motor I, a connecting shell, a hydraulic cylinder II, a lifting box, a hydraulic cylinder IV, and a sliding plate; the top and bottom of the sliding seat are respectively provided with a fixed plate I and a fixed plate II, and one end of the sliding seat is slidably connected to the connecting frame I through the connecting groove; the moving trolley is arranged on the guide column, and the bottom of the connecting shell is fixedly connected to one side of the moving trolley, and the hydraulic motor I is fixedly connected to the other side of the moving trolley through the connecting seat; the bottom of the lifting box is slidably connected to the connecting shell, and the connecting box at the top is slidably connected to the outside of the sliding seat; the cylinder body of the hydraulic cylinder II is fixedly connected to the inner side of the connecting shell, and the protruding end passes through the lifting box and is fixedly connected to the fixed plate II; the cylinder body of the hydraulic cylinder IV is fixedly connected to the fixed plate I through the connecting seat, and the protruding end is fixedly connected to the sliding plate slidably connected to the sliding seat and the outside of the fixed plate I, and the bottom of the sliding plate is slidably connected to the connecting groove on the connecting frame I.

5. The hoisting device for assembling and assembling a cross-channel steel box girder and its construction process according to claim 2 is characterized in that The stabilizing mechanism is provided with a protection box I, an externally threaded cylinder, a protection box II, a threaded rod, a rotating seat I, a rotating seat II, a rotating seat III, a hydraulic motor II and a hydraulic motor III; the rotating seat I and the rotating seat III are rotatably connected with the sliding seat, the top of the rotating seat I is arranged in the through hole on the fixed plate I, the bottom of the rotating seat III is arranged in the through hole on the fixed plate II, and a plurality of tooth grooves are arranged at the bottom of the rotating seat III; the hydraulic motor II and the hydraulic motor III are fixedly connected with the connecting seat arranged above the fixed plate I, and the gear on the output end of the hydraulic motor II passes through the through groove on one side of the sliding seat to mesh with the gear teeth on the outer wall of the rotating seat I, and the gear on the output end of the hydraulic motor III passes through the through groove on the other side of the sliding seat to mesh with the gear teeth on the outer wall of the rotating seat III; the protection The protective box I is slidably connected to the connecting grooves on the sliding seat, the fixed plate I and the fixed plate II, and a plurality of through holes are provided on the top of the protective box I; the externally threaded barrel is threadedly connected to the rotating seat I, the top of the externally threaded barrel is fixedly connected to the top of the protective box I through the connecting seat, the bottom passes through the through holes on the rotating seat III and is rotatably connected to the rotating seat II with a plurality of latching teeth on the top, and the rotating seat II is rotatably connected to the connecting seat at the bottom of the rotating seat II; the top of the protective box II is slidably connected to the bottom of the protective box I, and the plurality of through holes at the bottom of the protective box II correspond to the positions of the through holes at the top of the protective box I; the threaded rod is threadedly connected to the rotating seat II, the top of the threaded rod is slidably connected to the externally threaded barrel, and the bottom is fixedly connected to the bottom of the protective box II through the connecting seat.

6. A lifting device for assembling and assembling a cross-channel steel box girder and its construction process according to claim 2, characterized in that The main truss system includes a diamond truss, a rear node, a support rod, a diagonal support rod I, a diagonal support rod II, a crossbeam, and a connecting frame II; the diamond truss is provided with two groups, and several groups of diagonal support rods II are connected to the diamond trusses by pins, and the diagonal support rods I on one side of the diamond truss are connected to the rear node at the bottom of the diamond truss by pins; the crossbeam is provided with several, and the two ends of several crossbeams are fixedly connected to the two groups of diamond trusses by high-strength bolts; the connecting frame II is provided with two groups, and the two ends of the two groups of connecting frames II are symmetrically fixedly connected to the two sides of the support rod.

7. The hoisting device for assembling and assembling a cross-channel steel box girder and its construction process according to claim 2 is characterized in that The lifting system includes a hydraulic numerical control pump station, a platform rear beam, a hydraulic cylinder III, a platform front beam, a flat frame, a guide frame, a connecting rod I, a cable collector, a lifting jack, a steel rope, a lifting eye anchor head, and a lifting eye I; the platform rear beam and the platform front beam are slidably connected above the diamond truss, and the two ends of the flat frame are fixedly connected to the platform rear beam and the platform front beam, and the cylinder bodies of the two groups of hydraulic cylinders III are rotatably connected to the connecting seats fixedly connected to the tops of the two groups of diamond trusses, and the extended ends are fixedly connected to the two ends of the platform rear beam; the lifting jack, the guide frame, the connecting rod I, the cable collector, the lifting jack, the steel rope, the lifting eye anchor head, and the lifting eye I; the platform rear beam and the platform front beam are slidably connected above the diamond truss, and the two ends of the flat frame are fixedly connected to the platform rear beam and the platform front beam, and the cylinder bodies of the two groups of hydraulic cylinders III are respectively rotatably connected to the connecting seats fixedly connected to the tops of the two groups of diamond trusses, and the extended ends are respectively fixedly connected to the two ends of the platform rear beam; There are two groups of guide frames and cable collectors, which are fixedly connected to the top of two pairs of connecting rods I in sequence, and the two pairs of connecting rods I are fixedly connected to the two ends of the platform rear beam and the platform front beam respectively; one end of the steel strand passes through the through holes on the protection box I and the protection box II and is fixedly connected to the top of the lifting eye anchor head, and the other end passes through the lifting jack and the guide frame and is fixedly connected to the cable collector, and the bottom of the lifting eye anchor head is connected to the lifting eye I fixedly connected to the steel box beam through a pin shaft; the hydraulic CNC pump station is located on one side of the step ladder and is fixedly connected to a pair of beams at the top of the diamond truss.

8. The hoisting device for assembling and assembling a cross-channel steel box girder and its construction process according to claim 2 is characterized in that The anchoring system includes a rear anchoring beam, double-jointed steel, steel structure anchor rods, lifting lugs II, and threaded steel II; the rear anchoring beam is arranged above the rear node, and two groups of steel structure anchor rods are respectively arranged on both sides of the rear node, and the top of the steel structure anchor rod is fixedly connected to the rear anchoring beam, and the bottom is connected to the lifting lug II through a pin shaft; a plurality of threaded steel bars II are provided, and the tops of the plurality of threaded steel bars II are fixedly connected to the lifting lugs II through nuts, and the bottoms pass through the embedded holes on the bridge body and are fixedly connected to the double-jointed steel sections that fit the bottom surface of the bridge body through nuts.

9. The hoisting device for assembling and assembling a cross-channel steel box girder and its construction process according to claim 2 is characterized in that The walking system includes a track, a walking oil top, a walking trolley, a connecting rod II, a connecting rod I, and a connecting rod II; the track is arranged below the diamond truss, and the cylinder body of the walking oil top is rotatably connected to the connecting seat fixedly connected to the track, and the protruding end is rotatably connected to the diamond truss; the walking trolley is provided with two groups, which are respectively fixedly connected to the rear nodes on the two groups of diamond trusses by high-strength bolts, and the connecting rod II is located above the walking oil top and fixedly connected to the diamond truss; the connecting rod I is provided with a pair, the connecting rod I is slidably connected to the connecting seat provided at one end of the track, and one end of the connecting rod I is connected to each other through a pin shaft, and the other end is rotatably connected to the sliding seat; the connecting rod II is provided with a pair, one end of the connecting rod II is rotatably connected to the track, and the other end is slidably connected to the connecting rod II through a pin shaft, and one side of the connecting rod II is slidably connected to the sliding seat on the connecting rod I.

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