A lower layer longitudinally movable opening bridge and its opening method

Abstract

A lower-layer longitudinally moving and opening bridge, comprising a lower-layer structure and an upper-layer structure. A lower-layer track beam is arranged along the length direction of the bridge under the lower part of the upper main beam. A load-bearing track and a driving track are provided on the lower-layer track beam. The lower-layer movable bridge is supported on the load-bearing track by a suspension guiding mechanism. The lower-layer movable bridge is also provided with a suspension driving mechanism that cooperates with the driving track. The lower-layer movable bridge is driven by the suspension driving mechanism and longitudinally moves along the load-bearing track to realize the opening and closing of the bridge. After the opening and closing are in place, the locking between the lower-layer movable bridge and the load-bearing track is realized through a rigid locking mechanism. The height difference between the bridge decks of the lower-layer fixed bridge and the movable bridge is smoothly transitioned through a movable height difference compensation device to form a continuous slope. By providing a lower-layer longitudinally moving and opening bridge, the present invention solves the problem of the simultaneous normal passage of traffic on the bridge and large ships under the condition of limited longitudinal slope, and at the same time avoids the disadvantages of traffic interruption and the inability of vehicle traffic to pass when the bridge is opened.

Description

Technical Field

[0001] The present invention relates to a new technology field of bridge engineering in civil engineering, and particularly relates to a lower-layer longitudinally movable opening bridge and an opening method thereof. Background Art

[0002] An opening bridge is also called a movable bridge or a drawbridge. Since an opening bridge can improve the navigable clearance height of a bridge, it makes it possible to build a bridge on some rivers where it is impossible to build a bridge, and is applicable to rivers or ports where the traffic is not very frequent and tall ships need to navigate. Its advantages are that the piers are relatively low, thus greatly reducing the approach conditions on both banks, reducing the engineering quantity of approach bridges and embankments on both banks, and making it possible for non-motor vehicles to cross the river when the longitudinal slope is restricted. Currently, the existing opening bridges at home and abroad mainly have three forms: rotary type, vertical rotary type, and vertical lifting type.

[0003] A rotary opening bridge is an opening bridge whose bridge span structure can rotate around a vertical axis. When it rotates 90 degrees, ships on the river can pass through.

[0004] A vertical rotary opening bridge is a bridge whose bridge span structure above the waterway can rotate and open and close in the vertical plane. A single-leaf vertical rotary bridge is one that opens and closes the entire span opening structure from one end; a double-leaf vertical rotary bridge is one that is divided into two parts of the opening structure and opens and closes from both ends.

[0005] A lifting opening bridge is a structure where the bridge span in the middle navigable part of the bridge can be lifted. There is a tower and a suspended counterweight at each end of the opening bridge span.

[0006] When the above opening methods are used for opening, the vehicle traffic on the bridge needs to be interrupted. At the same time, due to the limitation of mechanical lifting capacity, the opening width is generally small, ships need to slow down to pass through, and both large and small ships need to be opened when passing through, which seriously affects the vehicle traffic function on the bridge and the ship passage capacity under the bridge. Therefore, the above three opening methods are difficult to be widely promoted and applied. Summary of the Invention

[0007] The purpose of the present invention is to provide a lower-layer longitudinally movable opening bridge to solve the problem of normal passage of both bridge traffic and large ships under the condition of restricted longitudinal slope, and at the same time avoid the drawbacks of traffic interruption and inability of vehicle traffic to pass when the bridge is opened.

[0008] To achieve the above object, the present invention is realized through the following technical solutions: A lower-layer longitudinally movable opening bridge, comprising a lower-layer structure and an upper-layer structure. The upper-layer structure includes an upper-layer main girder. It is characterized in that the lower-layer structure is composed of a lower-layer fixed bridge frame, a lower-layer movable bridge frame and a movable height difference compensation device. The lower-layer fixed bridge frame is fixedly connected to the upper-layer main girder. A lower-layer track beam is arranged along the length direction of the bridge below the upper-layer main girder. A load-bearing track and a driving track are provided on the lower-layer track beam. The lower-layer movable bridge frame is supported on the load-bearing track by a suspension guiding mechanism. The lower-layer movable bridge frame is also provided with a suspended driving mechanism that cooperates with the driving track. The lower-layer movable bridge frame is driven by the suspended driving mechanism and longitudinally moves along the load-bearing track to realize the opening and closing of the bridge. After the opening and closing are in place, the locking between the lower-layer movable bridge frame and the load-bearing track is realized through a rigid locking mechanism. The height difference between the bridge decks of the lower-layer fixed bridge frame and the movable bridge frame is smoothly transitioned through the movable height difference compensation device to form a continuous slope.

[0009] Further, the upper-layer structure is a motor vehicle passage, and the lower-layer structure is a passage for people and non-motor vehicles.

[0010] Further, the lower-layer structure includes lower-layer fixed bridge frames provided at both ends of the bridge, a lower-layer movable bridge frame located in the middle of the bridge and a movable height difference compensation device. An activity bridge frame moving passage is provided at the center of the lower-layer fixed bridge frame in the width direction. When the bridge is opened, the lower-layer movable bridge frame and the movable height difference compensation device move towards both ends and enter the activity bridge frame moving passage in the middle of the lower-layer fixed bridge frame, so as to retract into the lower-layer fixed bridge frame.

[0011] Further, a number of groups of suspension guiding mechanisms and rigid locking mechanisms are provided on the load-bearing track. Each group includes two suspension guiding mechanisms and a rigid locking mechanism located between the two suspension guiding mechanisms.

[0012] Further, a number of suspended driving mechanisms are provided on the driving track.

[0013] Further, the load-bearing track and the driving track are arranged in parallel. The driving mechanism is suspended and includes a chain fixed on the driving track, a driving frame that cooperates with the driving track. A sprocket that cooperates with the chain is provided on the driving frame. The sprocket is connected to a driving motor fixed on the driving frame through a transmission mechanism. The driving frame is connected to the lower-layer movable bridge frame through a suspended pin shaft. Under the drive of the driving motor, the sprocket rotates, meshes and drives with the chain fixed on the driving track, and the driving frame moves along the driving track, thereby driving the lower-layer movable bridge frame to move along the driving track.

[0014] Furthermore, the suspension guiding mechanism includes a U-shaped frame. A suspension oil cylinder is provided on the outer side of the U-shaped frame. The suspension oil cylinder is used to connect the lower movable bridge girder. The lower part of the load-bearing track extends into the U-shaped frame. Track platforms are provided on both sides of the lower part of the load-bearing track. Rollers matching with the track platforms are arranged on both sides of the inner wall of the U-shaped frame. Two rollers are arranged on each side of the inner wall of the U-shaped frame, and the two rollers are connected by a balance arm. A guide wheel mechanism is further provided on the inner wall of the U-shaped frame. The U-shaped support can drive the movable bridge girder to move horizontally along the track platform.

[0015] Furthermore, the rigid locking mechanism includes a rigid locking mechanism frame. A matching upper wedge block and lower wedge block are provided inside the rigid locking mechanism frame. The upper wedge block is fixed inside the rigid locking mechanism frame. An inclined slot is provided on the side wall of the rigid locking mechanism frame. The lower wedge block is movably connected with the inclined slot. A locking oil cylinder is arranged between the upper wedge block and the lower wedge block. When locking is required, the locking oil cylinder works, and the lower wedge block moves along the inclined slot and inserts below the upper wedge block until the bottom of the lower wedge block tightly presses against the track platform of the load-bearing track to achieve locking. Locking mechanism guide wheels are further provided on the inner wall of the rigid locking mechanism frame.

[0016] Furthermore, to achieve smooth opening of the bridge, the movable height difference compensation device includes a trolley frame supported on the fixed bridge by a large and small wheel set. The first end of the trolley frame is movably connected to the movable bridge girder through a double hinge connection with a bearing beam. A tail plate is provided at the second end of the trolley frame. The movable height difference compensation device moves longitudinally following the movable bridge girder. When the height difference between the movable bridge girder and the fixed bridge changes, different height differences are compensated by the change in the inclination degree of the bearing beam connected by the double hinge. The height difference between the lower movable bridge girder and the bridge deck of the fixed bridge is smoothly transitioned through the movable height difference compensation device to form a continuous slope surface.

[0017] Furthermore, the suspension oil cylinder of the suspension guiding mechanism and the suspension drive mechanism both have a displacement of ±5 cm up and down, which can adapt to the displacement changes of the bridge during the movement of the movable bridge girder and the driving of the vehicle, enabling the lower movable bridge girder to achieve longitudinal movement and opening without interrupting the upper traffic.

[0018] Furthermore, to ensure the safety and stability of the bridge after opening and closing in place, a pin mechanism is installed at the end of the lower fixed bridge. When the movable bridge is in the open or closed state, the pin mechanism is used to connect with the lower movable bridge girder to achieve fixed docking between the lower movable bridge girder and the lower fixed bridge girder, locking the movable bridge and ensuring that it is not affected by external forces or misoperations.

[0019] Another object of the present invention is to provide a method for opening a lower longitudinally movable and opening bridge, which solves the problem of normal passage of traffic on the bridge and large ships simultaneously under the condition of limited longitudinal slope, and at the same time avoids the disadvantages of traffic interruption and inability of vehicle traffic to pass when the bridge is opened.

[0020] To achieve the above object, the technical solution of the present invention is as follows: An opening method for a lower-layer longitudinally movable opening bridge, characterized in that the method comprises:

[0021] A. Unlock the rigid locking mechanism;

[0022] B. Start the driving mechanism, the sprocket rotates, meshes with the chain fixed on the driving track to generate meshing transmission, drives the driving frame to move along the driving track, thereby driving the lower-layer movable bridge and the movable height difference compensation device to move along the driving track and retract into the lower-layer fixed bridge. During the movement, the hanging guiding mechanism bears the load of the lower-layer movable bridge, and the suspended driving mechanism bears the longitudinal driving force;

[0023] C. After the opening is in place, stop the driving mechanism, and at the same time lock the rigid locking mechanism. The locking oil cylinder works, and the lower wedge block of the rigid locking mechanism inserts below the upper wedge block until the bottom of the lower wedge block tightly abuts against the track platform of the load-bearing track to achieve locking. At this time, the load of the lower-layer movable bridge is borne by the locked rigid locking mechanism.

[0024] Further, the opening method further includes step D. Use the pin mechanism provided at the end of the lower-layer fixed bridge to achieve the fixed docking between the movable bridge and the fixed bridge, and further lock the movable bridge.

[0025] The present invention provides a lower-layer longitudinally movable opening bridge, which solves the problem of the simultaneous normal passage of on-bridge traffic and large ships under the condition of limited longitudinal slope, and at the same time avoids the disadvantages of traffic interruption and inaccessibility of vehicle traffic when the bridge is opened. The present invention adopts a double-deck bridge design, separating people and vehicles up and down. Motor vehicles pass on the upper layer, and people and non-motor vehicles pass through the lower hanging bridge. Through the longitudinal movement and opening of the lower-layer bridge, the requirements for ship navigation are met. Compared with the conventional opening method, the present invention has the following characteristics:

[0026] (1) When the lower layer is opened, it does not affect the upper-layer traffic, overcoming the disadvantages of traffic interruption and inaccessibility of vehicles and crowds when the conventional opening bridge is opened.

[0027] (2) Due to the adoption of the double-deck bridge opening design, the non-motor vehicle bridge on the lower layer can significantly reduce the longitudinal slope and realize the non-motor vehicle crossing of the river on the urban cross-river bridge.

[0028] (3) When the lower-layer bridge is in the closed state, it can meet the normal passage requirements of small ships. When only a small number of large ships pass, the lower-layer bridge needs to be opened, reducing the opening frequency and the impact on traffic.

[0029] (4) The lower-layer opening bridge is connected to the upper main beam through multi-point suspension and multi-point drive, overcoming the limitation of the opening width caused by the mechanical lifting capacity of the conventional opening bridge and meeting the normal sailing speed requirements of large ships.

[0030] During the opening process, the hanging guiding mechanism is used to adapt to the deformation of the bridge and ensure the uniform load-bearing of multiple points of the hanging system. The longitudinal movement of the bridge is realized by the multi-point drive of the driving mechanism, so as to ensure fast speed and stable operation during the opening process of the bridge, and meet the all-weather opening requirements under adverse conditions such as typhoons. Brief Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the closed state of the lower movable bridge

[0032] Figure 2 It is a schematic diagram of the open state of the lower movable bridge

[0033] Figure 3 It is the overall layout drawing of the electromechanical system of the lower movable bridge;

[0034] Figure 4 It is the elevation layout drawing of the hanging guiding mechanism and the locking mechanism;

[0035] Figure 5 It is the cross-sectional layout drawing of the lower movable bridge;

[0036] Figure 6 It is the cross-sectional layout drawing of the hanging guiding mechanism;

[0037] Figure 7 It is the cross-sectional layout drawing of the rigid locking mechanism;

[0038] Figure 8 It is the three-dimensional solid drawing of the hanging guiding mechanism;

[0039] Figure 9 It is the three-dimensional solid drawing of the rigid locking structure;

[0040] Figure 10 It is the structural schematic diagram of the driving system;

[0041] Figure 11 It is the schematic diagram of the guiding mechanism in the driving system;

[0042] Figure 12 It is the elevation drawing of the height difference compensation device;

[0043] Figure 13 It is the schematic diagram of the alignment buffer device;

[0044] Figure 14 It is the structural schematic diagram of the buffer device. Detailed Embodiment

[0045] The present invention will be further described below in conjunction with the drawings by elaborating on a preferred specific embodiment in detail.

[0046] The figure includes: upper-layer main girder 1, lower-layer movable bridge frame 2, lower-layer fixed bridge frame 3, load-bearing track 4, driving track 5, suspension guiding mechanism 6, rigid locking mechanism 7, driving mechanism 8, suspension oil cylinder 601, suspension wheel mechanism 602, balance arm mechanism 603, guiding wheel mechanism 604, suspension guiding mechanism frame 605, upper wedge block 701, lower wedge block 702, locking oil cylinder 703, rigid locking mechanism frame 704, locking mechanism guiding wheel 705, sprocket 801, chain 802, reduction motor 803, suspension pin shaft 804, driving frame 805, pin shaft mounting plate 806, outer cover plate 807, horizontal guiding wheel 808, support frame 809, guiding wheel shaft 810, vertical guiding wheel 811, box girder 812, mounting cross beam 901, connecting pin shaft 902, double-hinge connecting load-bearing beam 903, mounting cross beam 904, trolley frame 905, large wheel set 906, small wheel set 907, tail plate 908, movable bridge frame 915, top surface of fixed bridge frame 916.

[0047] As shown in the figure, a lower-layer longitudinally movable opening bridge. The bridge is arranged as a double-deck bridge. The upper layer of the bridge is for motor vehicles to pass through, and an arch bridge or other bridge structures with relatively large stiffness is adopted. The lower layer of the bridge is a dedicated passage for pedestrians and non-motor vehicles, and is composed of a lower-layer fixed bridge frame 3 and a lower-layer movable bridge frame 2. The lower-layer fixed bridge frame 3 is connected to the upper-layer main girder 1 by bolts or welding; the lower-layer movable bridge frame 2 is supported on the load-bearing track 4 by a suspension guiding mechanism 6. The load-bearing track 4 is connected to the upper-layer main girder 1 by high-strength screw rods. The lower-layer movable bridge frame 2 is longitudinally moved and opened by a driving mechanism 8 in a sprocket driving mode, and retracts and extends inside the lower-layer fixed bridge frame 3. After being in place, it is fixed by a rigid locking mechanism 7. In the figure, A represents the suspension guiding mechanism 6, B represents the rigid locking mechanism 7, and C represents the driving mechanism 8.

[0048] Furthermore, the suspension guiding mechanism 6 is mainly composed of a suspension oil cylinder 601, a roller structure 602, a guiding wheel structure 604, a balance arm structure 603, and a suspension mechanism frame 605, etc. The suspension guiding mechanism 6 adjusts the deformation of the bridge frame during the longitudinal movement and opening process and ensures the multi-point uniform load bearing of the suspension system through the constant pressure compensation of the suspension oil cylinder 601; the roller structure 602 provides conditions for the opening and closing of the bridge frame by rolling the rollers on the load-bearing track 4; the guiding wheel structure 604 ensures that the bridge frame opens and closes along the set track; the balance arm structure 603 can prevent the suspension mechanism from vibrating due to uneven tracks; the suspension mechanism frame 605 provides an installation basis for the above-mentioned various mechanisms.

[0049] Further, the rigid locking mechanism 7 is rigidly connected to the lower movable bridge frame 2 and locks with the load-bearing track 4 using the wedge principle. The rigid locking mechanism 7 includes a rigid locking mechanism frame 704. Inside the rigid locking mechanism frame, there are a mating upper wedge 701 and lower wedge 702. The upper wedge 701 is fixed inside the rigid locking mechanism frame. The side wall of the rigid locking mechanism frame is provided with an inclined slot, and the lower wedge 702 is movably connected with the inclined slot. A locking oil cylinder 703 is arranged between the upper wedge 701 and the lower wedge 702, and the lower wedge 702 can be pushed and pulled back and forth by the locking oil cylinder 703. When the bridge is closed, the lower wedge of the wedge rigid locking mechanism contacts the load-bearing track and bears the wind load, live load, and bridge weight. The wind load is borne by the locking mechanism guide wheel 705, and the live load and bridge weight are borne by the wedge. The wedge rigid locking mechanism has the functions of rapid locking and unlocking, can effectively lock the movable bridge frame at any position, and bear the load on the movable bridge frame. The rigid locking mechanism has the functions of rapid locking and unlocking, can effectively lock the movable bridge frame at any position, and bear the load on the movable bridge frame.

[0050] Further, the driving mechanism 8 is arranged on the driving track 5 and is connected to the lower bridge frame by a pin shaft. The driving mechanism mainly bears the longitudinal driving force, and the bridge frame is longitudinally moved and opened by the driving of the driving mechanism. The driving mechanism includes a chain track 802 fixed on the driving track and a driving frame 805 matched with the driving track. A sprocket 801 matched with the chain track 802 is arranged on the driving frame 805. The sprocket is connected to a reduction motor 803 fixed on the driving frame 805 through a transmission mechanism. The driving frame 805 is connected to the lower movable bridge frame. Driven by the driving motor, the sprocket rotates, meshes with the chain fixed on the driving track, and the driving frame 805 moves along the driving track, thereby driving the lower movable bridge frame to move along the driving track. The driving frame 805 is connected to the lower movable bridge frame by a floating pin shaft 804 to adapt to the vertical deformation of the movable bridge frame. The bridge frame is longitudinally moved and opened by the driving of the driving mechanism.

[0051] During the opening and closing processes of the bridge frame, the suspension guiding mechanism 6 bears the bridge weight of the movable bridge frame. However, after the bridge frame is closed, the suspension guiding mechanism 6 no longer bears the load, and the bridge load is borne by the rigid locking mechanism 7. When the bridge is closed, the lower wedge of the rigid locking mechanism contacts the track and bears the wind load, live load, and bridge weight. The wind load is borne by the locking mechanism guide wheel, and the live load and bridge weight are borne by the wedge.

[0052] As Figure 10 and Figure 11The figure shows a schematic structural diagram of a drive system. The drive mechanism includes a chain drive device, a lower fixed bridge 3, a lower movable bridge 2, and a drive frame 805. The drive track is fixed to the lower fixed bridge 3. The chain drive device includes a reduction motor 803 with an output shaft and a chain track 802. A sprocket 801 with teeth is provided on the output shaft of the reduction motor. The sprocket meshes with the chain track. The reduction motor is fixed to the lower movable bridge 2, and the chain track is fixed to the lower fixed bridge 3. The lower fixed bridge 3 and the lower movable bridge 2 are connected by a floating pin 804. A pin mounting plate 806 is provided at the lower end of the floating pin 804. The pin mounting plate 806 is bolted and fastened to the lower movable bridge 2. A vertical through hole is provided at the central position of the frame 805. The vertical through hole is in lateral contact connection with the floating pin 804 so that the floating pin 804 can float up and down in the vertical through hole when the fixed bridge generates a vertical displacement;

[0053] The drive mechanism includes a horizontal guiding mechanism and a vertical guiding mechanism mounted on the frame. The horizontal guiding mechanism includes two groups of support frames 809 and two groups of horizontal guiding wheels 808 pivotally connected to the two groups of support frames. The front and rear two groups of support frames are respectively fastened and connected to the two ends in the transverse direction of the frame. The same group of support frames are symmetrically arranged on the left and right sides of the drive track. The two groups of horizontal guiding wheels are respectively in contact with the two sides of the drive track to make the left and right linear motion of the movable bridge stable. The vertical guiding mechanism includes two groups of outer covers 807, two groups of guiding wheel shafts 810, and two groups of vertical guiding wheels 811. The two groups of outer covers are symmetrically arranged in the front and rear on both sides of the reduction motor. The two groups of outer covers are bolted and fastened to the frame. The two groups of guiding wheel shafts are symmetrically arranged on the left and right sides of the drive track. A horizontal steel plate is provided at the bottom end of the drive track. The two groups of guiding wheel shafts are symmetrically arranged above and below both sides of the horizontal steel plate. The guiding wheel shafts are in interference fit with the vertical guiding wheels. The vertical guiding wheels are in contact with both sides of the horizontal steel plate to make the up and down linear motion of the drive track stable;

[0054] The drive mechanism further includes a synchronous drive controller. The synchronous drive controller is electrically connected to the reduction motor to control the forward and reverse rotation of the reduction motor.

[0055] A support plate is provided on the side of the frame. The support plate is bolted and fastened to the reduction motor by an internal hexagonal bolt. The reduction motor is provided with an upper cover plate. The upper cover plate is inserted into the output shaft of the reduction motor. The output shaft of the reduction motor is bolted and fastened to the upper cover plate so that the sprocket meshes with the chain track stably.

[0056] The driving mechanism is provided with a box girder 812. The frame is provided with mounting holes, and the box girder is arranged in the mounting holes of the frame.

[0057] The guide wheel shaft includes a long end shaft and a short end shaft. The box girder is provided with positioning holes. The long end shaft is inserted into the positioning holes of the box girder and is fixedly connected with the outer cover plate through bolts. The short end shaft is in interference fit with the vertical guide wheel. The moving bridge is provided with reserved holes, and the suspension pin shaft 804 is inserted into the reserved holes. The suspension pin shaft 804 fixedly connects the pin shaft mounting plate and the moving bridge through bolts so that the driving mechanism is fixed on the moving bridge.

[0058] The aperture of the vertical through hole is larger than the shaft diameter of the suspension pin shaft 804. The difference between the aperture of the vertical through hole and the shaft diameter of the suspension pin shaft 804 is 3-5 mm. The reduction motor is a reduction motor with a self-locking function, and the self-locking force to power ratio of the reduction motor is 6-10.

[0059] The lower-layer movable bridge is telescopically opened and closed inside the lower-layer fixed bridge through longitudinal movement. There is a height difference at the connection between the lower-layer movable bridge and the lower-layer fixed bridge. An adjustable height difference compensation device 9 is provided to achieve a smooth transition and form a continuous slope. Figure 12 FIG. is a schematic structural diagram of the adjustable height difference compensation device 9, which includes a mounting cross beam 901, a connecting pin shaft 902, a double-hinged connecting load-bearing beam 903, a mounting cross beam 904, a trolley frame 905, large wheel sets 906, small wheel sets 907, a tail plate 908, a movable bridge 915, and the top surface 916 of the fixed bridge.

[0060] The adjustable height difference compensation device 9 includes that the first end of the trolley frame 905 is movably connected to the movable bridge 915 through the double-hinged connecting load-bearing beam 903, and the second end of the trolley frame is provided with a tail plate 908; both ends of the double-hinged connecting load-bearing beam 903 are respectively connected to the mounting cross beam 901 through the connecting pin shaft 902. One mounting cross beam 904 at one end of the double-hinged connecting load-bearing device 903 is connected to the first end of the trolley frame, and the other mounting cross beam 901 is connected to the movable bridge 915. When the height difference between the movable bridge and the fixed bridge changes, the connecting pin shaft rotates, causing the inclination degree of the double-hinged connecting load-bearing beam 903 to change to achieve compensation for different height differences. The trolley frame 905 is provided with large wheel sets 906 and small wheel sets 907, and the large wheel sets 906 and small wheel sets 907 are supported on the top surface 916 of the fixed bridge and move together during the opening and closing process of the upper and lower movable bridges.

[0061] To ensure the reliability of opening, the functions of the suspension guiding mechanism and the driving mechanism are separated. The suspension guiding mechanism mainly bears vertical loads and horizontal loads, and the driving mechanism mainly bears longitudinal driving forces.

[0062] To achieve the smooth opening of the bridge crane, both the load-bearing track and the driving track are located on a circular curve with the same radius. Since the lower track beam and the upper main beam adopt different vertical curves, there are different height differences along the longitudinal direction of the bridge between the top edge of the lower track beam and the bottom edge of the upper main beam, and this height difference is leveled by pads with different heights.

[0063] To ensure the safety and stability of the bridge crane after opening and closing in place, a pin mechanism and a buffer mechanism are added. The pin mechanism is installed at the end of the bridge crane. Its main function is to effectively fix the docking and lock the moving bridge crane when the bridge crane is in the open or closed state, ensuring that it is not affected by external forces or misoperations.

[0064] According to a specific embodiment of the present invention, the lower movable bridge crane 2 is divided into left and right parts, which move to both sides respectively and telescopically in the lower fixed bridge cranes 3 on both sides. Positioning buffer devices are installed at the corresponding positions of the left and right parts of the lower movable bridge crane to ensure the safety and stability when the lower movable bridge crane is closed. Figure 13 It is an elevation layout diagram of the positioning buffer device. The figure includes a precise positioning device I, a buffer device II, and an anti-collision pad III. The precise positioning device I includes a fixed seat and a pin arranged correspondingly. The fixed seat includes a frustum-shaped depression with a large outer side and a small inner side, and the shape of the pin matches the shape of the depression. There are at least 2 precise positioning devices, which are arranged on both sides of the end face of the movable bridge crane. The buffer device II includes a buffer structure 201 and a striker 202. The buffer structure is further divided into a bottom plate, a socket head cap screw, a spring washer, and a polyurethane buffer. The polyurethane buffer sets the buffer stroke according to needs and is installed through the bottom plate. The buffer devices are set to 2 - 6 pieces according to the width of the bridge. The anti-collision pad III includes an L-shaped angle steel and a rubber block, and the anti-collision pad is welded to the end cross beam of the movable bridge crane through the L-shaped steel.

[0065] The specific working process is as follows:

[0066] When the movable bridge cranes on both sides move to be about to close, the pins are gradually inserted into the fixed seats. Since at least 2 positioning devices are arranged on both sides, when the bridge crane is completely closed, the bridge decks on both sides can be accurately aligned.

[0067] Before the movable bridge crane is closed, the striker contacts the polyurethane buffer, and the polyurethane buffer uses its compression stroke to reduce the moving speed of the bridge crane to zero.

[0068] To prevent unexpected situations (such as the moving speed of the movable bridge crane is too large and the buffer device cannot reduce its speed to zero before the bridge crane is closed), the anti-collision pads arranged at the end of the cross beam can prevent the bridge crane from colliding rigidly.

[0069] The mechanical power system of the present invention is powered by a drag chain cable method, which occupies a small space and has high safety.

[0070] To ensure the smooth opening of the movable bridge crane, the bridge stiffness, the cylinder stroke, and the track accuracy, etc. need to meet the following requirements:

[0071] (1) The stiffness of the upper main girder shall meet the requirement that the maximum vertical deflection under live load is not greater than 1 / 1000 of the main span.

[0072] (2) The suspension cylinders and the suspended drive mechanism can adapt to displacements of ±5 cm up and down, and the lower movable bridge can be longitudinally moved and opened without interrupting the upper traffic.

[0073] (3) The straightness of the half-opening width length range of the load-bearing track and the drive track shall not be greater than ±2.5 mm, and the height difference of the track splicing joint shall not be greater than ±5 mm.

[0074] (4) The gap between the side and bottom of the lower movable bridge and the lower fixed bridge is 5 - 10 cm.

[0075] (5) The gaps between the top surface of the rigid locking mechanism and the bottom surface of the upper main girder, between the rigid locking mechanism and the track, and between the bottom surface of the drive motor and the top surface of the lower bridge are 5 - 10 cm.

[0076] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and substitutions to the present invention will be obvious. Therefore, the protection scope of the present invention shall be defined by the appended claims.

Claims

1. A lower-layer longitudinally movable opening bridge, comprising a lower-layer structure and an upper-layer structure, the upper-layer structure including an upper-layer main beam, characterized in that The lower structure consists of a lower fixed bridge frame, a lower movable bridge frame, and a movable height difference compensation device. The lower fixed bridge frame is fixedly connected to the upper main beam. A lower track beam is arranged along the length direction of the bridge under the lower part of the upper main beam. A load-bearing track and a driving track are provided on the lower track beam. The lower movable bridge frame is supported on the load-bearing track by a suspension guiding mechanism. The lower movable bridge frame is also provided with a driving mechanism that cooperates with the driving track. The lower movable bridge frame is driven by a floating driving mechanism and longitudinally moves along the load-bearing track to realize the opening and closing of the bridge. After the opening and closing are in place, the locking between the lower movable bridge frame and the load-bearing track is realized through a rigid locking mechanism. The height difference between the bridge decks of the lower fixed bridge frame and the movable bridge frame is smoothly transitioned through the movable height difference compensation device to form a continuous slope. The movable height difference compensation device includes a trolley frame supported on the fixed bridge frame by a large and small wheel set. The first end of the trolley frame is movably connected to the movable bridge frame through a double-hinged connecting bearing beam. A tail plate is provided at the second end of the trolley frame. The movable height difference compensation device moves longitudinally with the movable bridge frame. When the height difference between the movable bridge frame and the fixed bridge frame changes, the inclination degree of the double-hinged connecting bearing beam changes to realize the compensation of different height differences.

2. The lower-layer longitudinally movable opening bridge according to claim 1, characterized in that The upper structure is a motor vehicle passage, and the lower structure is a passage for people and non-motor vehicles.

3. The underslung longitudinal opening type bridge according to claim 1, characterized in that The lower structure includes lower fixed bridge frames arranged at both ends of the bridge, a lower movable bridge frame located in the middle of the bridge, and a movable height difference compensation device. An activity bridge frame moving passage is provided at the center of the lower fixed bridge frame along the width direction. When the bridge is opened, the lower movable bridge frame and the movable height difference compensation device move towards both ends and enter the activity bridge frame moving passage in the middle of the lower fixed bridge frame, so as to retract into the lower fixed bridge frame.

4. The underslung longitudinally-sliding opening bridge according to claim 1, wherein The load-bearing track and the driving track are arranged in parallel. A plurality of floating driving mechanisms are provided on the driving track. The floating driving mechanism includes a chain fixed on the driving track, a driving frame that cooperates with the driving track, a sprocket provided on the driving frame that cooperates with the chain, and the sprocket is connected to a driving motor fixed on the driving frame through a transmission mechanism. The driving frame is connected to the lower movable bridge frame through a floating pin shaft. Driven by the driving motor, the sprocket rotates, meshes with the chain fixed on the driving track to generate meshing transmission, and the driving frame moves along the driving track, thereby driving the lower movable bridge frame to move along the driving track.

5. The lower-layer longitudinally movable opening bridge according to claim 1, characterized in that The suspension guiding mechanism includes a U-shaped frame. A suspension oil cylinder is provided outside the U-shaped frame, and the suspension oil cylinder is used to connect the lower movable bridge frame. The lower part of the load-bearing track extends into the U-shaped frame, and track platforms are provided on both sides of the lower part of the load-bearing track. Rollers that cooperate with the track platforms are arranged on both sides of the inner wall of the U-shaped frame. Two rollers are arranged on each side of the inner wall of the U-shaped frame, and the two rollers are connected by a balance arm. A guiding wheel mechanism is also provided on the inner wall of the U-shaped frame. The U-shaped frame can drive the movable bridge frame to move horizontally along the track platform.

6. The lower layer longitudinally moving and opening bridge according to claim 1, characterized in that The rigid locking mechanism includes a rigid locking mechanism frame. Inside the rigid locking mechanism frame, there are a cooperating upper wedge block and a lower wedge block. The upper wedge block is fixed inside the rigid locking mechanism frame. The side wall of the rigid locking mechanism frame is provided with an inclined slot, and the lower wedge block is movably connected to the inclined slot. A locking oil cylinder is arranged between the upper wedge block and the lower wedge block. When locking is required, the locking oil cylinder works, and the lower wedge block moves along the inclined slot and inserts below the upper wedge block until the bottom of the lower wedge block tightly abuts against the track platform of the load-bearing track, achieving locking. A locking mechanism guide wheel is also arranged on the inner wall of the rigid locking mechanism frame.

7. The lower-layer longitudinally movable opening bridge according to claim 1, characterized in that An insertion pin mechanism is installed at the end of the lower fixed bridge. When the movable bridge is in the open or closed state, the insertion pin mechanism is used to connect with the lower movable bridge, realizing the fixed docking between the lower movable bridge and the lower fixed bridge.

8. The opening method of a lower-layer longitudinally movable opening bridge according to claim 1, characterized in that The method includes: A. Unlock the rigid locking mechanism; B. Start the driving mechanism. The sprocket rotates and meshes with the chain fixed on the driving track, driving the frame to move along the driving track, thereby driving the lower movable bridge and the movable height difference compensation device to move along the driving track and retract into the lower fixed bridge. During the movement, the load of the lower movable bridge is borne by the suspension guiding mechanism, and the longitudinal driving force is borne by the floating driving mechanism; C. After reaching the open position, stop the driving mechanism and simultaneously lock the rigid locking mechanism. The locking oil cylinder works, and the lower wedge block of the rigid locking mechanism inserts below the upper wedge block until the bottom of the lower wedge block tightly abuts against the track platform of the load-bearing track, achieving locking. At this time, the load of the lower movable bridge is borne by the locked rigid locking mechanism.

9. The opening method of a lower-layer longitudinally movable opening bridge according to claim 8, characterized in that, The opening method further includes step D. Utilize the insertion pin mechanism arranged at the end of the lower fixed bridge to realize the fixed docking between the movable bridge and the fixed bridge, further locking the movable bridge.

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