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CN-122013674-A - Cross-iron large-tonnage steel box girder falling device and application method thereof

CN122013674ACN 122013674 ACN122013674 ACN 122013674ACN-122013674-A

Abstract

The invention relates to the technical field of steel box girder transporting devices, in particular to a cross-iron large-tonnage steel box girder falling device and a using method thereof, comprising a frame, wherein the inner side of the frame is fixedly provided with a sliding rail which is arranged along the length direction of the frame and is used for providing guiding and bearing foundation for each moving part, the inside of the frame is symmetrically provided with two lifting cylinders, the upper end of each lifting cylinder vertically slides and is provided with a lifting column, the inside of a central beam is symmetrically provided with two groups of buffer components, each buffer component comprises a buffer plug, the buffer plug is slidably arranged in the buffer tube, a non-rigid buffer system is constructed through the buffer tube, the buffer plug and the seepage disc with seepage holes, and the transient pressure difference gradient between the first pressure cavity and the second buffer cavity is utilized to absorb the inertial kinetic energy of the beam body, so that the transient impact load of sudden stop is effectively buffered, the beam body jump caused by the compressibility of hydraulic oil is prevented, the 'hard landing' risk in the process of falling the beam with ultra-large tonnage is solved, and extremely high safety redundancy is provided.

Inventors

  • ZHU QITAO
  • SU WENHUI
  • YANG WUCE
  • CHEN SHENGBO
  • SUN HONGYUN

Assignees

  • 陕西路桥集团有限公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. The girder falling device for the large-tonnage iron box girder comprises a frame (1) and is characterized in that a sliding rail (2) is fixedly arranged on the inner side of the frame (1), the sliding rail (2) is arranged along the length direction of the frame (1) and is used for providing guiding and bearing foundation for each moving part, two lifting cylinders (103) are symmetrically arranged in the frame (1), the two lifting cylinders (103) are fixedly connected through a central girder (104) to form an integral stress structure and ensure synchronism and stability in the lifting process, lifting columns (105) are vertically and slidably arranged at the upper end of each lifting cylinder (103), the upper ends of the lifting columns (105) are used for supporting the bottom of the iron box girder, the lifting columns (105) move upwards along with the increase of pressure when the internal pressure of the lifting cylinders (103) is increased, two groups of buffer assemblies are symmetrically arranged in the central girder (104), the buffer assemblies comprise buffer plugs (206), the buffer plugs (206) are slidably arranged in the buffer tubes (201), and the buffer plugs (201) are arranged in the buffer tubes (201), and the buffer tubes (201) are separated by the first buffer tube and the second buffer tube (201).
  2. 2. The cross-iron large-tonnage steel box girder falling device of claim 1 is characterized in that the bottom end of the lifting cylinder (103) is in sliding connection with the upper surface of the sliding rail (2), so that the lifting cylinder (103) and an upper structure thereof can be subjected to position adjustment along the sliding rail (2), and further, the transverse fine adjustment and alignment of the steel box girder in the girder falling process are realized, a supporting plate (102) is slidably arranged on the surface of the sliding rail (2), a pushing column (106) is fixedly arranged at the upper end of the supporting plate (102), and the pushing column (106) is arranged along the extending direction of the sliding rail (2).
  3. 3. The cross-iron large-tonnage steel box girder falling device of claim 2 is characterized in that a limit box (107) is fixed at the upper end of the supporting plate (102), a locking block (108) is arranged at the inner end of the limit box (107), and the bottom end of the locking block (108) is abutted against a cross beam on the surface of the sliding rail (2).
  4. 4. A girder dropping device for a large-tonnage steel box girder with a cross iron as claimed in claim 1, wherein one ends, close to each other, of two buffer tubes (201) are fixedly provided with a control cylinder (203), the buffer tubes (201) are fixedly connected with a lifting cylinder (103), a driven ring (205) is movably arranged in the control cylinder (203), a center rod (207) is fixedly arranged on the surface of the driven ring (205), the center rod (207) extends axially and penetrates into the corresponding buffer tube (201), a liquid seepage disc (401) is slidably arranged at the inner end of each buffer plug (206), and the liquid seepage disc (401) is fixedly connected with the center rod (207), so that movement of each buffer plug (206) can be synchronously transmitted to the driven ring (205) through the center rod (207).
  5. 5. The large-tonnage steel box girder falling device with the iron crossing structure according to claim 4, wherein a passive disc (406) is arranged between the liquid seepage disc (401) and the central rod (207), the passive disc (406) and the central rod (207) are coaxially arranged, a plurality of diversion holes (402) and liquid seepage holes (403) are annularly distributed on the surface of the liquid seepage disc (401), a plurality of sealing plugs (405) are fixedly arranged at one end, far away from the central rod (207), of the passive disc (406), and the sealing plugs (405) are arranged in one-to-one correspondence with the corresponding diversion holes (402) and are used for selectively plugging or opening the diversion holes (402).
  6. 6. The large-tonnage steel box girder falling device with the iron crossing function according to claim 5, wherein a plurality of current limiting columns (404) are arranged on the surface of the driven plate (406) in a penetrating manner, the current limiting columns (404) are respectively inserted into corresponding seepage holes (403), a plurality of sliding plates (208) are slidably arranged on the outer surface of the center rod (207), and the sliding plates (208) are uniformly distributed in a ring shape and fixedly connected with the driven plate (406).
  7. 7. The large-tonnage steel box girder falling device with the iron crossing function according to claim 6, wherein an actuating ring (210) and a driven sleeve (211) are coaxially and rotatably arranged in the control cylinder (203), the driven sleeve (211) is positioned on the same axis as the actuating ring (210) and fixedly connected with a plurality of sliding sheets (208), a transmission rod (213) penetrates through the inner part of the center rod (207), a limiting arc ring (407) is rotatably arranged at one end, close to the liquid seepage disc (401), of the center rod (207), and a rectangular hole is formed in the outer surface of the center rod (207).
  8. 8. The large-tonnage steel box girder falling device of claim 7, wherein a plurality of inclined notches are formed in the surface annular direction of the limit arc ring (407), the inclined surface of each inclined notch is in contact with the end part of a corresponding flow limiting column (404), one end, close to the limit arc ring (407), of the flow limiting column (404) is provided with an inclined surface structure matched with the inclined notch so as to enhance contact fit and improve transmission stability, a sealing ring (301) is sleeved on the outer surface of the buffer plug (206), a supporting spring (302) is arranged between the sealing ring (301) and the buffer plug (206), a plurality of break blocks (303) are arranged on the surface of the buffer plug (206), a conducting groove (304) is formed in each break block (303), and a driving ring (408) is arranged on one side, close to the center rod (207), of the liquid seepage disc (401).
  9. 9. The large-tonnage steel box girder falling device for the cross iron of claim 8, wherein the conical surface of the driving ring (408) is contacted with the on-off block (303), the on-off block (303) is pushed to move away from the buffer plug (206), and the on-off groove (304) on the on-off block (303) is used for communicating the inner space of the sealing ring (301) with the inner space of the buffer plug (206).
  10. 10. A method for using a cross-iron large-tonnage steel box girder dropping device, which is used for the cross-iron large-tonnage steel box girder dropping device according to any one of claims 1 to 9, and is characterized by comprising the following steps: S1, moving a frame (1) to a preset position below a steel box girder, completing integral alignment through a sliding rail (2), then controlling a lifting cylinder (103) to work, enabling a lifting column (105) to extend upwards synchronously and abut against the bottom of the steel box girder, realizing the bearing of the steel box girder, and on the basis, enabling the lifting column (105) to slowly fall back through adjusting the internal pressure of the lifting cylinder (103), so as to drive the steel box girder to stably fall; S2, in the process of lowering the steel box girder, the electric push rod (209) drives the driving ring (210) to rotate, and under the action of the inclined structure, the driven sleeve (211) and the sliding piece (208) are driven to axially move along the central rod (207), so that the driven disc (406) is displaced, at the moment, the sealing plug (405) is separated from the diversion hole (402), the diversion channel is opened, a hydraulic medium can rapidly flow in the buffer tube (201), so that the flow requirement of the steel box girder in continuous lowering is met, and the stability of the lowering process is improved; S3, when the steel box girder is lowered to a target position and needs to be kept in a static state, the passive disc (406) is controlled to reset, the sealing plug (405) is enabled to reclose the diversion hole (402), meanwhile, the angle adjusting motor (204) is started, the limiting arc ring (407) is driven to rotate through the transmission rod (213), the current limiting column (404) is enabled to be in an adjustable state, at the moment, when the lifting cylinder (103) stops working, the pressure of one side of the liquid seepage disc (401) far away from the lifting cylinder (103) is rapidly reduced, and the pressure of the buffer cavity on the other side is higher than that of the corresponding pressure cavity in short time due to the liquid inertia effect, so that the current limiting column (404) is pushed to generate displacement, and because a circulation gap between the current limiting column (404) and the liquid seepage hole (403) is a preset structural parameter, hydraulic medium can only be gradually balanced in a limited flow mode, so that slow release and stable retention of the pressure are realized, and impact or displacement of the steel box girder is avoided.

Description

Cross-iron large-tonnage steel box girder falling device and application method thereof Technical Field The invention relates to the technical field of steel box girder transporting devices, in particular to a cross-iron large-tonnage steel box girder falling device and a using method thereof. Background The steel box girder has the advantages of strong integrity, high bearing capacity, suitability for large-span structures and the like, is widely applied to the bridge engineering of a cross-railway, is limited by the operation safety and construction time window ("skylight point") of the existing line under the construction scene of the cross-railway (the bridge engineering of the cross-railway and the highway), and has high precision, good stability and safety redundancy capacity; In order to solve the problem of inertia of a large-tonnage steel box girder in the girder falling process, the prior art mostly adopts a rigid support or simple throttling mode to control, and lacks an effective non-rigid buffer structure, when a lifting device stops or pressure mutation occurs, the falling kinetic energy of the girder body is difficult to absorb in time, and a hard landing phenomenon is easy to generate, so that the structure impact is larger, the girder body can rebound or vibrate, the construction risk is increased, meanwhile, the conventional buffer mode is limited in general adjusting capacity, the dynamic matching of flow and pressure is difficult to realize according to different working conditions, and the buffer effect is unstable. Disclosure of Invention The invention aims to provide a cross-iron large-tonnage steel box girder falling device and a using method thereof, which are used for solving the problems in the background technology. The technical scheme includes that the cross-iron large-tonnage steel box girder falling device comprises a frame, wherein sliding rails are fixedly arranged on the inner side of the frame, the sliding rails are arranged along the length direction of the frame and are used for providing guiding and bearing bases for moving parts, two lifting cylinders are symmetrically arranged in the frame and fixedly connected through a central girder so as to form an integral stress structure and ensure synchronism and stability in the lifting process, lifting columns vertically slide and penetrate through the upper end of each lifting cylinder, the upper end of each lifting column is used for supporting the bottom of the steel box girder, the lifting columns move upwards along with the increase of pressure in the lifting cylinders so as to stably lift the steel box girder, two groups of buffer assemblies are symmetrically arranged in the central girder and comprise buffer plugs, the buffer plugs are slidably arranged in buffer tubes, and the buffer tubes are divided into a first pressure cavity and a second pressure cavity by the buffer plugs. As a further scheme of the invention, the bottom end of the lifting cylinder is in sliding connection with the upper surface of the sliding rail, so that the lifting cylinder and the upper structure thereof can be subjected to position adjustment along the sliding rail, thereby realizing the transverse fine adjustment and alignment of the steel box girder in the girder falling process, the surface of the sliding rail is provided with the supporting plate in a sliding manner, the upper end of the supporting plate is fixedly provided with the propelling column, and the propelling column is arranged along the extending direction of the sliding rail. As a further scheme of the invention, a limit box is fixedly arranged at the upper end of the supporting plate, a locking block is arranged at the inner end of the limit box, and the bottom end of the locking block is abutted against a cross beam on the surface of the sliding rail. As a further scheme of the invention, one ends of the two buffer tubes, which are close to each other, are fixedly provided with control cylinders, the buffer tubes are fixedly connected with the lifting cylinders, the inside of each control cylinder is movably provided with a driven ring, the surface of each driven ring is fixedly provided with a center rod, the center rods extend along the axial direction and penetrate into the corresponding buffer tubes, the inner ends of the buffer plugs are slidably provided with liquid seepage discs, and the liquid seepage discs are fixedly connected with the center rods, so that the movement of the buffer plugs can be synchronously transmitted to the driven rings through the center rods. As a further scheme of the invention, a passive disc is arranged between the liquid seepage disc and the central rod, the passive disc and the central rod are coaxially arranged, a plurality of diversion holes and liquid seepage holes are annularly distributed on the surface of the liquid seepage disc, a plurality of sealing plugs are fixedly arranged at one end of the passive disc far away from th