Bridge crossing method and device for floating crane to assist overturning of crane ship cantilever crane

Abstract

The invention discloses a bridge crossing method and device for floating crane auxiliary crane ship boom overturning, the bridge crossing device comprises a crane boom, a rear pull rod rotation driving oil cylinder and a lodging oil cylinder, the crane boom comprises a bottom frame, a stand column, a top frame, a middle supporting rod and a rear pull rod, the bottom frame is fixedly installed on a deck of a crane ship, and the lower end of the stand column is hinged to the bottom frame through a first hinge shaft; the upper end of the stand column is fixedly provided with a top frame. The middle supporting rod comprises a first rod body and a second rod body. The upper end of a rear pull rod is hinged to the top frame through a second hinge shaft, a second rod body is detachably installed at the lower end of the rear pull rod, a cylinder body of a rear pull rod rotation driving oil cylinder is hinged to the first rod body through a third hinge shaft, and an output shaft of the rear pull rod rotation driving oil cylinder is hinged to the rear pull rod through a fourth hinge shaft; a cylinder body of the lodging oil cylinder is hinged to the bottom frame through a fifth hinged shaft, and an output shaft of the lodging oil cylinder is hinged to the stand column through a sixth hinged shaft. According to the gap bridge device, overturning of the cargo boom frame can be achieved, the navigation height of the gap bridge device is reduced, and the gap bridge device can be erected again after navigation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of construction hoisting, and more particularly relates to a floating crane assisted crane ship boom turning over bridge method and device. BACKGROUND

[0002] With the rapid development of marine engineering and large cross-sea bridge construction, large offshore gantry crane construction crane ships (floating cranes) are increasingly widely used. In order to meet the hoisting height, hoisting capacity and operation radius requirements of large bridge box girder and other heavy components, the existing crane ships (such as "Tianyi No. 1" crane ship) usually design their hoisting booms as high and rigid structures.

[0003] Although this design ensures the operation performance, it also brings serious technical defects: there is a contradiction between the fixed height of the hoisting structure (hoisting boom) and the navigation flexibility of the ship. When the crane ship needs to be transferred, especially needs to pass through the near sea, gulf or inland water area with dense waterways and numerous bridges, its too high navigation height (such as the navigation height of "Tianyi No. 1" is up to 84m) often makes it unable to pass through the obstacles with height limit (such as Hangzhouwan Highway Bridge, the navigation height is only 46m).

[0004] The crane ships in the prior art generally lack self-adaptive navigation ability, and the hoisting boom system is not integrated with a turning over or laying down mechanism for reducing the navigation height of itself in design. Therefore, when facing height-limited obstacles, it is difficult to pass through by using the conventional scheme, and the crane ship needs to be modified. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides a floating crane assisted crane ship boom turning over bridge method and device, which realizes the turning over of the hoisting boom by allowing the two rod bodies of the middle support rod to be detachable, allowing the middle support rod and the rear pull rod to be detachable, allowing the column and the base frame to be hinged, and increasing the laying down oil cylinder, and can reduce the navigation height of the bridge device and can be re-erected after navigation.

[0006] In order to achieve the above purpose, according to one aspect of the present application, a floating crane assisted crane ship boom turning over bridge device is provided, characterized in that it comprises a hoisting boom, a rear pull rod turning drive oil cylinder and a laying down oil cylinder, wherein: The crane boom frame comprises a base frame, a column, a top frame, a middle support rod and a rear pull rod, the base frame is fixedly installed on the deck of a crane ship, the lower end of the column is hingedly connected to the base frame through a horizontal first hinge shaft, the upper end of the column is fixedly installed with the top frame, the middle support rod comprises a first rod body and a second rod body, the lower end of the first rod body and the upper end of the second rod body are detachably connected together, the upper end of the first rod body and the lower end of the second rod body are respectively fixedly installed on the column and the base frame, the upper end of the rear pull rod is hingedly connected to the top frame through a second hinge shaft, the lower end of the rear pull rod is detachably installed on the second rod body, the middle support rod is located between the column and the rear pull rod, the cylinder body of a rear pull rod rotating drive oil cylinder is hingedly connected to the first rod body through a third hinge shaft, the output shaft of the rear pull rod rotating drive oil cylinder is hingedly connected to the rear pull rod through a fourth hinge shaft, so as to drive the rear pull rod to rotate around the center line of the second hinge shaft; The cylinder body of the overturning oil cylinder is hingedly connected to the base frame through a fifth hinge shaft, the output shaft of the overturning oil cylinder is hingedly connected to the column through a sixth hinge shaft, so as to drive the column to overturn by a set angle around the center line of the first hinge shaft, and the fifth hinge shaft is detachably connected to the base frame and the column respectively. The first hinge shaft and the sixth hinge shaft are parallel to each other.

[0007] Preferably, the lower end of the rear pull rod is detachably installed on the second rod body through a plug-in pin. The lower end of the rear pull rod is provided with a first pin hole, the lower end of the second rod body is provided with a plug-in pin mounting seat, the plug-in pin mounting seat is provided with a second pin hole matched with the first pin hole, the lower end of the rear pull rod is inserted into the plug-in pin mounting seat, and the plug-in pin is used to detachably install the lower end of the rear pull rod on the base frame after passing through the first pin hole and the second pin hole.

[0008] Preferably, the crane boom frame further comprises a rear pull rod tensioning oil cylinder and a plug-in pin dismounting oil cylinder. The plug-in pin mounting seat is installed on the second rod body, the cylinder body of the rear pull rod tensioning oil cylinder is installed on the plug-in pin mounting seat, the first pin hole is a long slot, and the length direction of the long slot is consistent with the length direction of the rear pull rod. The output shaft of the rear pull rod tensioning oil cylinder is connected to the rear pull rod, the length direction of the output shaft of the rear pull rod tensioning oil cylinder is consistent with the length direction of the rear pull rod, so as to tension the rear pull rod to make the rear pull rod elastically deform when the output shaft of the rear pull rod tensioning oil cylinder is elongated, facilitate the plug-in pin to be pushed into the first pin hole and the second pin hole after the hole wall of the lower end of the first pin hole reaches a set position, and facilitate the rear pull rod to retract so that the hole wall of the lower end of the first pin hole is matched with the hole wall of the second pin hole to clamp the plug-in pin when the output shaft of the rear pull rod tensioning oil cylinder is retracted and the tensioning force acting on the rear pull rod is removed. The cylinder body of the plug pin dismounting cylinder is mounted on the chassis, and the output shaft of the plug pin dismounting cylinder is coaxially connected with the plug pin for pushing the plug pin into the first pin hole and the second pin hole and pulling the plug pin out of the first pin hole and the second pin hole.

[0009] Preferably, a rear pull rod ejection cylinder is further included, and the cylinder body of the rear pull rod ejection cylinder is mounted on the second rod body for ejecting the rear pull rod from the plug pin mounting seat.

[0010] Preferably, the movable pulley set mounted on the top frame is fixed on the top frame by a movable pulley fixing device to ensure the structural stability of the movable pulley set during the overturning process and to prevent the steel wire rope connected to the movable pulley set from being removed, and the movable pulley fixing device is detachably mounted on the top frame.

[0011] Preferably, a first support rod and a second support rod located below the first support rod are further included. The upper end and the lower end of the first support rod are fixedly connected with the top frame and the first rod body, respectively, and the lower end and the upper end of the second support rod are fixedly connected with the lower end of the stand and the first rod body, respectively, so as to transmit the load force borne by the pulley mounted on the top frame to the chassis through the lower end of the stand.

[0012] Preferably, a hand-operated hoist is further included, and the hand-operated hoist is connected with the cylinder body of the lodging cylinder for temporarily fixing the lodging cylinder after the fifth hinge shaft is dismounted from the lodging cylinder and the chassis.

[0013] Preferably, a real-time monitoring system for overturning and erecting construction is further included for monitoring the overturning angle of the stand, monitoring the hydraulic pressure of the lodging cylinder, and monitoring the stroke of the output shaft of the lodging cylinder.

[0014] According to another aspect of the present application, a method for bridging the bridge device for assisting the crane ship boom frame of the floating crane to overturn is further included, and the method comprises the following steps: 1) The bridge device is mounted on the crane ship, and initially, the stand is in a vertical state. The steps for laying down the stand are as follows: 1.1) A lifting tool of the floating crane with sufficient lifting height and lifting capacity is connected to the top frame, so that the floating crane can assist the stand to overturn; 1.2) The output shaft of the rear pull rod tensioning cylinder is elongated to tension the rear pull rod, so that the rear pull rod is elastically deformed to provide a gap for dismounting the plug pin; 1.3) The plug pin connecting the rear pull rod and the second rod body is pulled out by operating the plug pin dismounting cylinder, so that the lower end of the rear pull rod is separated from the second rod body; 1.4) The rear pull rod tensioning cylinder releases the tensioning force applied to the rear pull rod; 1.5) disconnect the first and second rod bodies of the middle strut; 1.6) start the overturning oil cylinder, under the protection of the floating crane, the overturning oil cylinder pushes the column, the column turns around the center line of the first hinge shaft by a set angle, the column passes the overturning point, the column can overturn and lay down under its own weight after passing the overturning point, in the process of laying down the column, the overturning angle of the column is monitored by the inclinometer sensor installed on the column, the output load of the overturning oil cylinder and the displacement of the output shaft of the overturning oil cylinder are monitored by the force sensor I and the displacement sensor installed on the overturning oil cylinder, the lifting tension of the hanger of the floating crane is monitored by the force sensor II installed on the hanger of the floating crane; 1.7) the hanger of the floating crane continues to hoist the top frame, dismounts the fifth hinge shaft connecting the overturning oil cylinder and the bottom frame, and gradually lowers the column on the floating crane by relying on the floating crane completely, until the column is placed stably on the cradle at the bow of the floating crane; in this way, the navigation height of the crane jib is significantly reduced, and the overturned crane jib can pass through a low-height bridge.

[0015] Preferably, the bridge passing method further comprises: 2) after the floating crane and the crane jib pass through the bridge, the column is erected, specifically as follows: 2.1) the column is hoisted and gradually lifted by the hanger of the floating crane, so that the column rotates around the center line of the first hinge shaft; 2.2) after the column overturns by a set angle, the overturning point is reached, and the fifth hinge shaft is used to reconnect the overturning oil cylinder and the bottom frame; 2.3) the column is pulled by the overturning oil cylinder, and the column is overturned to the initial vertical state with the assistance of the hanger of the floating crane, while the lower end of the rear pull rod also extends into the plug-in pin mounting seat on the second rod body, and the first rod body and the second rod body of the middle strut are also connected together, in the process of overturning the column to the initial vertical state, the overturning angle of the column is monitored by the inclinometer sensor installed on the column, the output load of the overturning oil cylinder and the displacement of the output shaft of the overturning oil cylinder are monitored by the force sensor I and the displacement sensor installed on the overturning oil cylinder, and the lifting tension of the hanger of the floating crane is monitored by the force sensor II installed on the hanger of the floating crane; 2.4) the first rod body and the second rod body of the middle strut are detachably connected together; 2.5) the rear pull rod tensioning oil cylinder is elongated, and the rear pull rod is tensioned, so that the first pin hole at the lower end of the rear pull rod reaches a set position, so as to install the plug-in pin on the first pin hole and the second pin hole; 2.6) operate the plug-in pin dismounting oil cylinder to push the plug-in pin connected to the output shaft of the plug-in pin dismounting oil cylinder into the first pin hole and the second pin hole; 2.7) Retract the rear tie rod tensioning cylinder to release the tension on the rear tie rod, causing the rear tie rod to retract. Use the hole wall of the first pin hole to cooperate with the hole wall of the second pin hole to clamp the insertion pin, thereby making the rear tie rod and the insertion pin mounting seat detachably connected together. 2.8) Remove the fixing device of the movable pulley block locked on the top frame to restore the normal lifting operation capability of the crane vessel.

[0016] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1) The bridge-crossing device for the floating crane-assisted boom tilting of the present invention hinges the lower end of the boom column to the base frame fixed on the deck through a first hinge shaft. Unlike the rigid structure of the column and the base frame, the column, which is the main load-bearing structure of the entire boom, is no longer fixed, but has the ability to tilt around the horizontal first hinge shaft. With the help of the hinged foundation of the column, and in conjunction with the subsequent driving of the tilting cylinder and the lifting of the floating crane's lifting gear, the boom column can be tilted (lowered) from the vertical working state to a near-horizontal state. This will significantly reduce the overall navigation height of the crane vessel and solve the defect that the crane vessel cannot pass under bridges.

[0017] 2) The bridge-crossing device for the boom tilting of the floating crane-assisted crane vessel of the present invention designs the central support rod into two parts: a first rod body and a second rod body, which are detachably connected. In the operation mode, the two rod bodies are connected as one unit, forming a stable support structure together with the column and the base frame, ensuring the rigidity and stability of the crane boom when bearing huge lifting loads. In the tilting mode, the two rod bodies are separated, releasing the rigid support on the column and freeing up the necessary movement space for the column to tilt around the first hinge axis. Furthermore, this invention designs the lower end of the rear tie rod to be detachably mounted on the second rod body. In the operating mode, the rear tie rod, as the main rear tension component, together with the top frame, columns, and central support rod, forms a closed mechanical truss system, ensuring lifting performance. In the tilting mode, after the lower end of the rear tie rod is detached, the constraints on the top frame and columns are also released, allowing them to tilt downwards along with the columns.

[0018] The detachable design of the middle strut and rear tie rod allows the bridge crossing device to switch between a high-rigidity operation mode and a low-altitude navigation mode, achieving compatibility and unification of the requirements of two extreme working conditions.

[0019] 3) The bridge-crossing device for the boom tilting of the floating crane of the present invention has a detachable fifth hinge shaft design, which allows the column to tilt in two stages. In the first stage, the column is tilted by power, and the tilting cylinder works to push the column to tilt by a set angle, so that the column can pass the center of gravity balance point. In the second stage, after the fifth hinge shaft is disassembled, the tilting cylinder is separated from the base frame. At this time, the column is decoupled and can continue to tilt freely under gravity with the cooperation of other auxiliary equipment such as external floating cranes until it is completely tilted. This design takes into account the powerful lifting / pulling capacity of the hydraulic system (for the start-up and final erection stage) and the need for full-stroke tilting.

[0020] 4) The bridge crossing device for the floating crane-assisted boom tilting of the present invention, through its unique structural design, enables the flexible tilting of the column, thereby significantly reducing the navigation height of the crane vessel and allowing it to freely navigate waters with different height restrictions. This effectively solves the problem in the prior art where crane vessels cannot pass through low bridges, waterways and other obstacles due to the excessively high fixed height of the crane boom, and greatly expands the operating range and application scenarios of the crane vessel.

[0021] 5) The bridge-crossing device for the boom tilting of the floating crane-assisted lifting vessel of the present invention fully considers operational safety. For example, the detachable connection between the rear tie rod and the central support rod, as well as the use of plug pins, ensures reliable connection and separation between various components during the tilting process, avoiding safety accidents caused by loose or failed connections. In addition, the entire tilting process is carried out smoothly under the control of the hydraulic system, effectively reducing the risks caused by sudden impacts or unstable movements, and ensuring the safety of construction personnel and equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the column of the present invention in the erected state; Figure 2 This is a schematic diagram of the rear pull rod extending into the insertion pin mounting seat of the present invention.

[0023] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Lifting boom; 2. Rear tie rod rotation drive cylinder; 3. Tilting cylinder; 11. Base frame; 12. Column; 13. Top frame; 14. Middle support rod; 15. Rear tie rod; 101. First hinge shaft; 102. Second hinge shaft; 103. Third hinge shaft; 104. Fourth hinge shaft; 105. Fifth hinge shaft; 106. Sixth hinge shaft; 141. First rod body; 142. Second rod body; 143. Second pin hole; 151. First pin hole; 152. Insert pin; 153. Insert pin mounting seat; 4. Rear tie rod support seat; 5. First support rod; 6. Second support rod; 7. Lifting device; 8. Moving pulley. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Reference Figure 1 , Figure 2 The bridge crossing device for assisting the boom tilting of a floating crane includes a boom 1, a rear tie rod rotation drive cylinder 2, and a tilting cylinder 3.

[0026] The lifting boom 1 includes a base frame 11, a column 12, a top frame 13, a central support rod 14, and a rear tie rod 15. The base frame 11 is fixedly installed on the deck of the crane vessel. Initially, the column 12 is vertical and supported by the top frame 13. The lower end of the column 12 is hinged to the base frame 11 via a horizontal first hinge pin 101. The upper end of the column 12 is fixedly installed with the top frame 13. The central support rod 14 includes a first rod body 141 and a second rod body 142. The lower end of the first rod body 141 and the upper end of the second rod body 142 are detachably connected together. The lower ends of the rods are fixedly installed on the column 12 and the base frame 11 respectively. The upper end of the rear pull rod 15 is hinged to the top frame 13 through the second hinge shaft 102. The lower end of the rear pull rod 15 is detachably installed on the second rod body 142. The middle support rod 14 is located between the column 12 and the rear pull rod 15. The cylinder body of the rear pull rod rotation drive cylinder 2 is hinged to the first rod body 141 through the third hinge shaft 103. The output shaft of the rear pull rod rotation drive cylinder 2 is hinged to the rear pull rod 15 through the fourth hinge shaft 104 to drive the rear pull rod 15 to rotate around the center line of the second hinge shaft 102.

[0027] The cylinder body of the reclining cylinder 3 is hinged to the base frame 11 via the fifth hinge shaft 105, and the output shaft of the reclining cylinder 3 is hinged to the column 12 via the sixth hinge shaft 106 to drive the column 12 to rotate around the center line of the first hinge shaft 101 by a set angle. The fifth hinge shaft 105 is detachably connected to the base frame 11 and the column 12 respectively.

[0028] The first hinge shaft 101 to the sixth hinge shaft 106 are parallel to each other.

[0029] The fixed installation of the base frame 11 to the crane ship deck provides a solid foundation for the entire facility, while the hinged design of the column 12 to the base frame 11 and the synergistic effect of the central strut 14 and the rear tie rod 15 ensure the stability and load-bearing capacity of the crane boom 1 during lifting operations.

[0030] The detachable connection between the rear tie rod 15 and the central support rod 14, along with the use of the plug pin 152, ensures reliable connection and separation between components during the tilting process of the column 12, avoiding safety accidents caused by loose or failed connections. Furthermore, the entire tilting process is smoothly controlled by the hydraulic system, effectively reducing the risks caused by sudden impacts or unstable movements.

[0031] The preferred crane vessel for the above-mentioned offshore bridge erection construction is the "Tianyi" crane vessel. The present invention mainly modifies the crane boom of the "Tianyi" crane vessel.

[0032] Furthermore, the lower end of the rear pull rod 15 is detachably mounted on the second rod body 142 via a plug pin 152; the rear pull rod 15 and the second rod body 142 are connected by the plug pin 152, making the assembly and disassembly between the two convenient and efficient.

[0033] The lower end of the rear pull rod 15 is provided with a first pin hole 151, and the lower end of the second rod body 142 is provided with a plug-in pin mounting seat 153. The plug-in pin mounting seat 153 is provided with a second pin hole 143 that mates with the first pin hole 151. The lower end of the rear pull rod 15 extends into the plug-in pin mounting seat 153. After the plug-in pin 152 passes through the first pin hole 151 and the second pin hole 143, the lower end of the rear pull rod 15 is detachably mounted on the base frame 11. The mating design of the plug-in pin 152 ensures the firmness of the connection between the rear pull rod 15 and the second rod body 142.

[0034] Furthermore, it also includes a rear tie rod tensioning cylinder and a pin-removal cylinder 152.

[0035] The insertion pin mounting seat 153 is mounted on the second rod body 142, and the cylinder body of the rear tie rod tensioning cylinder is mounted on the insertion pin mounting seat 153. The first pin hole 151 is an elongated hole, and the length direction of the elongated hole is consistent with the length direction of the rear tie rod 15.

[0036] The output shaft of the rear tensioning cylinder is connected to the rear tensioning rod 15, and the output shaft of the rear tensioning cylinder is aligned with the length direction of the rear tensioning rod 15. This allows the rear tensioning rod 15 to be tensioned when the output shaft of the rear tensioning cylinder extends, thereby causing elastic deformation of the rear tensioning rod 15 (this elastic deformation is very small, only requiring easy installation of the insertion pin 152). This facilitates the insertion pin 152 being pushed into the first pin hole 151 and the second pin hole 143 after the lower end of the first pin hole 151 reaches the set position. After the output shaft of the rear tensioning cylinder retracts and the tension force acting on the rear tensioning rod 15 is released, the rear tensioning rod 15 retracts, allowing the lower end of the first pin hole 151 to engage with the hole wall of the second pin hole 143 to clamp the insertion pin 152. Preferably, a rear tie rod tensioning seat is installed on the rear tie rod 15, and the output shaft of the rear tie rod tensioning cylinder is connected to the rear tie rod 15 through the rear tie rod tensioning seat to tension the rear tie rod 15.

[0037] The cylinder body of the insert pin removal and installation cylinder is mounted on the base frame 11. The output shaft of the insert pin removal and installation cylinder is coaxially connected to the insert pin 152 for pushing the insert pin 152 into the first pin hole 151 and the second pin hole 143 and pulling the insert pin 152 out of the first pin hole 151 and the second pin hole 143.

[0038] The automated installation and removal of the insert pin 152 is achieved through a hydraulically controlled rear tie rod tensioning cylinder and a pin removal cylinder. This not only reduces the need for manual operation but also significantly improves work efficiency. During tensioning, the rear tie rod 15 undergoes elastic deformation, and the elongated first pin hole 151 engages with the second pin hole 143 to provide clearance for the installation of the insert pin 152. Simultaneously, after the force of the rear tie rod tensioning cylinder is released, the rear tie rod 15 retracts, causing the walls of the first pin hole 151 and the second pin hole 143 to tightly clamp the insert pin 152, significantly enhancing the stability and reliability of the connection.

[0039] During lifting operations on the crane vessel, the movable pulley 8 and lifting device 7 on the crane vessel bear a very large vertical load through the top frame 13. This huge force generates a strong forward tilting moment, attempting to pull the column 12 forward. The core function of the rear tie rod 15 is to bear and transmit this huge pulling force.

[0040] The upper end of the rear tie rod 15 is hinged to the top frame 13, and the lower end is detachably connected to the second rod 142. Together with the column 12, the top frame 13, and the middle support rod 14, it forms a closed mechanical truss system. In this truss, the rear tie rod 15 is the main tension member. Like a taut string, it firmly pulls the top frame 13 backward, balancing the forward tilting moment and ensuring the rigidity and stability of the entire crane boom 1 under huge loads.

[0041] The pull pin 152 is the connection point at the lower end of the rear tie rod 15. In the collapsed mode, it must be able to be quickly and safely disassembled so that the lower end of the rear tie rod 15 separates from the second rod 142, providing space for the column 12 to be lowered. In the operating mode, it must be able to reliably transmit the enormous tensile force borne by the rear tie rod 15. There must be no gaps between the hole wall of the first pin hole 151, the hole arm of the second pin hole 143, and the pull pin 152; otherwise, the resulting impact could easily cause shearing fracture of the pull shaft or crushing of the pin hole wall. Therefore, the lower end hole wall of the first pin hole 151 and the hole wall of the second pin hole 143, designed with elongated holes, tightly clamp the pull pin 152 from two opposite directions. This clamping state essentially applies a strong preload to the connection point, completely eliminating gaps between the pull pin 152 and the two pin holes, forming a relatively good rigid connection.

[0042] Furthermore, a rear tie rod support 4 is installed on the first rod body 141 to support the rear tie rod 15 after the rear tie rod rotation drive cylinder 2 pulls the rear tie rod 15 to rotate. The rear tie rod support 4 can effectively support the rear tie rod 15 and prevent the rear tie rod 15 from hitting other components during rotation.

[0043] Furthermore, the movable pulley assembly installed on the top frame 13 is fixed to the top frame by a movable pulley fixing device to ensure the structural stability of the movable pulley assembly during the flipping process and to prevent the steel wire rope connected to the movable pulley assembly from being removed. The movable pulley fixing device is detachably installed on the top frame 13.

[0044] Furthermore, it also includes a first support rod 5 and a second support rod 6 located below the first support rod 5; The upper and lower ends of the first support rod 5 are fixedly connected to the top frame 13 and the first rod body 141, respectively. The lower and upper ends of the second support rod 6 are fixedly connected to the lower end of the column 12 and the first rod body 141, respectively, so as to transfer the load force borne by the pulleys installed on the top frame 13 to the base frame 11 through the lower end of the column 12. This design effectively disperses and transmits the load force during the lifting process by transferring the load force borne by the pulleys installed on the top frame 13 to the base frame 11 through the lower end of the column 12. This load dispersion method can avoid local stress concentration, reduce the stress burden on key components, thereby extending the service life of the equipment and reducing the risk of structural fatigue and damage caused by excessive stress. After adding the first support rod 5 and the second support rod 6, the structure of the entire lifting boom 1 is more stable. The first support rod 5 and the second support rod 6 provide the lifting boom 1 with stronger lateral stability and torsional resistance.

[0045] Furthermore, it also includes a rear pull rod ejection cylinder, the cylinder body of which is mounted on the second rod body 142 for ejecting the rear pull rod from the insert pin mounting seat 153. By placing the end of the piston rod of the rear pull rod ejection cylinder close to the insert pin 152, the rear pull rod 15 can be easily pushed, causing it to rotate around the center line of the second hinge axis 102, thereby allowing the rear pull rod 15 to quickly exit from the insert pin mounting seat 153.

[0046] Furthermore, a hand-operated hoist is also included, which connects to the cylinder body of the tilting cylinder 3 to temporarily fix the tilting cylinder 3 after the fifth hinge shaft 105 is disassembled from the tilting cylinder 3 and the base frame 11. The introduction of the hand-operated hoist provides a temporary fixation means for the tilting cylinder 3. If the tilting cylinder 3 is not properly fixed after the fifth hinge shaft 105 is disassembled, it may shake or even swing uncontrollably due to external forces, posing a serious threat to the workers and surrounding equipment. The hand-operated hoist can effectively limit the range of motion of the tilting cylinder 3, ensuring its stability in a powerless state, providing reliable safety for construction personnel and reducing the probability of accidents. During the reconnection of the tilting cylinder 3 to the base frame 11, precise alignment of the hinge hole is required. The hand-operated hoist can fine-tune the position of the tilting cylinder 3 to ensure precise docking with the hinge seat on the base frame 11, greatly facilitating installation and debugging.

[0047] Furthermore, it also includes a real-time monitoring system for the tilting and erection construction, used to monitor the tilting angle of the column 12, the hydraulic pressure of the tilting cylinder 3, and the stroke of the output shaft of the tilting cylinder 3.

[0048] First, the monitoring system can monitor the rotation angle of column 12 in real time. Angle control is crucial during the rotation of the crane boom 1. By accurately monitoring the rotation angle, construction personnel can ensure that column 12 rotates along the predetermined trajectory and angle, avoiding structural collisions or instability caused by angle deviations. This is essential for ensuring construction safety and equipment integrity.

[0049] Secondly, real-time monitoring of the hydraulic pressure in the reclining cylinder 3 helps optimize the operation of the hydraulic system. Hydraulic pressure is a crucial factor affecting cylinder performance and lifespan; real-time monitoring ensures the cylinder operates within a safe pressure range, preventing equipment malfunctions caused by excessively high or low pressure. Simultaneously, precise hydraulic pressure control improves cylinder efficiency and extends equipment lifespan.

[0050] Furthermore, the real-time monitoring of the output shaft stroke of the tilting cylinder 3 by the monitoring system provides precise data support for construction. The stroke data reflects the cylinder's extension and retraction status. Through real-time monitoring, construction personnel can accurately control the cylinder's extension and retraction, ensuring the precision of the column 12's tilting and lifting operations. This not only improves construction quality but also reduces repeated adjustments caused by stroke errors, thereby increasing construction efficiency.

[0051] Furthermore, the real-time monitoring system provides crucial information for equipment maintenance and fault diagnosis. Through the accumulation and analysis of real-time data, maintenance personnel can proactively identify potential problems, perform preventative maintenance, and reduce the occurrence of unexpected failures. In the event of abnormal situations, the data provided by the monitoring system helps to quickly locate problems, shorten troubleshooting time, and minimize downtime losses.

[0052] Finally, the monitoring system enhances the automation and intelligence of the construction process. Real-time data feedback makes the construction process more transparent and controllable, allowing construction personnel to make real-time adjustments and optimizations based on the monitoring data, achieving more precise and efficient construction operations. This is particularly important in the complex and ever-changing offshore construction environment, effectively responding to various emergencies and ensuring the smooth progress of construction.

[0053] According to another aspect of the present invention, a method for crossing a bridge using the aforementioned floating crane-assisted crane boom tilting device is also provided, comprising the following steps: 1) The bridge crossing device is installed on the crane vessel. Initially, the column 12 is in a vertical state. The steps for lowering the column 12 are as follows: 1.1) Connect a lifting device 7 of a floating crane with sufficient lifting height and lifting capacity to the top frame 13 so that the floating crane can assist in tilting the column 12; 1.2) After the operation of the pull rod 15, the output shaft of the tensioning cylinder extends, tensioning the pull rod 15, causing the pull rod 15 to undergo elastic deformation, providing a gap for the disassembly of the insertion pin 152; 1.3) Operate the plug-in pin disassembly cylinder to pull out the plug-in pin 152 connecting the rear pull rod 15 and the second rod body 142, so that the lower end of the rear pull rod 15 is separated from the second rod body 142. 1.4) The tensioning cylinder of the rear tie rod 15 releases the tension applied to the rear tie rod 15; 1.5) Disconnect the first rod 141 and the second rod 142 of the middle support rod 14; 1.6) Start the overturning cylinder 3. Under the protection of the lifting weight of the lifting device 7 of the floating crane, the overturning cylinder 3 pushes the column 12. The column 12 rotates around the center line of the first hinge shaft 101 by a set angle, so that the column 12 passes the overturning point. The overturning point during the overturning process is the critical overturning point of the column 12. Once the column 12 passes this angle or the overturning point, the torque generated by the weight of the column 12 itself is no longer a restoring torque, but is transformed into an overturning torque. After passing the overturning point, the column 12 can be overturned under its own weight and thus fall down. During the process of falling down the column 12, the overturning angle of the column 12 is monitored by the inclinometer sensor installed on the column 12. The output load of the overturning cylinder 3 and the displacement of the output shaft of the overturning cylinder 3 are monitored by the force sensor I and the displacement sensor installed on the overturning cylinder 3, respectively. The lifting force of the lifting device 7 is monitored by the force sensor II installed on the lifting device 7 of the floating crane. 1.7) The lifting device 7 of the floating crane continues to hold the top frame 13, and the fifth hinge shaft 105 connecting the tilting cylinder 3 and the base frame 11 is disassembled. Instead, the floating crane gradually lowers the column 12 until the column 12 is placed stably on the bracket at the bow of the crane vessel. In this way, the floating crane significantly reduces the navigation height of the crane boom 1, and the overturned crane boom 1 can pass through height-restricted bridges that are lower than the height of the crane boom 1 before overturning.

[0054] Furthermore, this bridging method also includes: 2) After the crane vessel and crane boom 1 have passed the bridge, erect column 12, as follows: 2.1) The column 12 is suspended by the lifting device 7 of the floating crane and gradually raised, so that the column 12 rotates around the center line of the first hinge axis 101; 2.2) After the column 12 is flipped to the set angle, it reaches the flipping and collapsing point, and the collapsing cylinder 3 and the base frame 11 are reconnected through the fifth hinge shaft 105; 2.3) The column 12 is pulled by the reclining cylinder 3. With the assistance of the lifting device 7 of the floating crane, the column 12 is flipped to the initial vertical state. At the same time, the lower end of the rear pull rod 15 also extends into the plug-in pin mounting seat on the second rod 142. The first rod 141 and the second rod 142 of the middle support rod 14 are also connected together. During the process of the column 12 flipping to the initial vertical state, the tilt sensor installed on the column 12 monitors the flipping angle of the column 12. The force sensor I and the displacement sensor installed on the reclining cylinder 3 monitor the output load of the reclining cylinder 3 and the displacement of the output shaft of the reclining cylinder 3, respectively. The force sensor II installed on the lifting device 7 of the floating crane monitors the lifting force of the lifting device 7. 2.4) The first rod body 141 and the second rod body 142 of the middle support rod 14 are detachably connected together; 2.5) The rear tie rod 15 is extended by the tensioning cylinder, which tensions the rear tie rod 15 so that the first pin hole 151 at the lower end of the rear tie rod 15 reaches the set position, so that the insert pin 152 can be installed on the first pin hole 151 and the second pin hole 143 on the insert pin mounting seat 153. 2.6) Operate the plug-in pin disassembly and assembly cylinder to push the plug-in pin 152 connected to the output shaft of the plug-in pin disassembly and assembly cylinder into the first pin hole 151 and the second pin hole 143. 2.7) Retract the tensioning cylinder of the rear tie rod 15, release the tension on the rear tie rod 15, and retract the rear tie rod 15. Use the hole wall of the first pin hole 151 and the hole wall of the second pin hole 143 to clamp the insertion pin 152, so that the rear tie rod 15 and the insertion pin mounting seat 153 can be detachably connected together. 2.8) Remove the 8 sets of fixing devices for the movable pulleys locked on the top frame 13 to restore the normal lifting operation capability of the crane ship.

[0055] The following explanation uses the modification of the crane boom 1 of the "Tianyi" crane ship as an example.

[0056] 1. The "Tianyi" crane vessel uses another floating crane (the "Yingshang 1" crane vessel as the floating crane, equipped with a floating crane and a lifting device 7 mounted on the floating crane) to assist in the tilting and turning of the crane boom 1. Since the crane boom 1 of the "Tianyi" crane vessel is a rigid structure, and the floating crane can only provide upward traction for the crane boom 1, it cannot provide power for the tilting (lowering) of the crane boom 1. Therefore, it needs to be modified to add a tilting mechanism and power. The tilting and turning modification of the crane boom 1 of the "Tianyi" crane vessel includes the modification of the column 12, the central support rod 14, the rear tie rod 15, the hydraulic pump station, the pulley block locking device, and the bow bracket.

[0057] Modifications were made to the junction of column 12 and base frame 11. First, the flange connecting plate at the junction of column 12 and base frame 11 was modified by extending the original flange. Second, upper and lower collapsing hinge seats were added to the front side of the flange of column 12, and the entire assembly was bored to install the first hinge shaft 101. The first hinge shaft 101 is a hinge shaft with a diameter of 446mm. During the collapsing process of Tianyi, column 12, top frame 13, and the structures fixed to column 12 and top frame 13 rotate along the first hinge shaft 101. Upper and lower tilting cylinder hinge seats are added to the rear side of the flange of column 12. When column 12 is tilted (0°→7.6°, where 0° is the vertical position and 7.6° is the position where column 12 is rotated 7.6°, tilting is for lowering) or erected (7.6°→0°), column 12 is lifted / pulled by tilting cylinder 3. Before tilting, the concentricity of the lower hinge seat of tilting cylinder 3 must be carefully checked to ensure that the hinge can be smoothly withdrawn. Finally, an inclinometer sensor is installed inside column 12, and a hinge sensor is installed on the floating crane's lifting wire rope to detect the tilting angle of the boom 1 and the lifting tension of the floating crane. During the tilting process, the output pressure and displacement of tilting cylinder 3 are monitored simultaneously to ensure the smooth tilting operation of boom 1.

[0058] Modifications were made to the central strut 14 and the rear tie rod 15. First, to add a collapsing mechanism, a disconnect flange was added to the central strut 14, breaking it into a first rod 141 and a second rod 142. Before the column 12 collapses (falls down), the two flanges are connected with bolts; when collapsing, the bolts are removed and the central strut 14 is disconnected. A plug-in pin mounting seat 153, a rear tie rod support seat 4, a first strut 5, and a second strut 6 were added to the first rod 141 of the central strut 14 for the tensioning and collapsing operation of the rear tie rod 15. Secondly, the following components are added: a pin mounting base 153, a rear tie rod tensioning cylinder, a pin 152 disassembly cylinder, and the pin 152 itself. Before Tianyi collapses, the pin 152 needs to be removed. Then, the rear tie rod ejection cylinder pushes the rear tie rod 15 out of the pin mounting base 153, allowing the rear tie rod 15 to rotate around the center line of the second hinge shaft 102. After the rear tie rod ejection cylinder pushes out the rear tie rod 15, the piston rod retracts, without affecting the rotation of the rear tie rod. The pin disassembly / removal cylinder and the rear tie rod ejection cylinder enable quick assembly / disassembly of the pin 152 and quick ejection of the rear tie rod 15 out of the pin mounting base 153. Finally, a rear tie rod rotation drive cylinder 2 is added to the rear tie rod 15.

[0059] The overturning auxiliary device was modified. First, a hydraulic pump station was installed behind the column 12 to provide hydraulic pressure to each cylinder. The hydraulic pump station does not rotate with the column 12 during the overturning process, and all commands for adding hydraulic cylinders to all tiltable structures on the lifting boom 1 are issued from the control system of the hydraulic pump station. Second, to prevent the movable pulleys 8 from swaying during the overturning construction process, a fixing device for the movable pulleys 8 was installed to fix the movable pulleys 8 to the top frame 13. Finally, a bow bracket was installed to support the overturning structure (the overturning structure includes the column 12, top frame 13, first rod 141, rear tie rod 15, etc., which can be rotated around the center line of the first hinge axis 101), and the bow brackets are connected by bolts.

[0060] 2. Construction method for the collapse (overturning) of the crane boom 1 of the "Tianyi" crane vessel ①Preparatory work: Check whether the lifting system of the floating crane "Yingshang 1", the hydraulic tilting system of "Tianyihao", and the tipping spreader 7 are normal. Then, fill the ballast tank at the bow of "Tianyihao" with water to control its draft to 3.06m at the bow and 3.46m at the stern. Confirm whether the draft depth meets the design requirements by reading the scale lines on the ship.

[0061] ② Install the lower hinge shaft of the first support rod 5. On the control panel, manually rotate the lower hinge extension knob of the support rod on the control panel to install the clamping plate and locking plate; adjust the reclining cylinder 3 to the locked state, remove the fastening bolts on the reclining and flipping flange, and remove the connecting bolts between the flanges of the middle support rod 14. After completion, the transport ship will transfer the bow bracket to the Baitashan anchorage, and the bow bracket will be lifted by the "Yingshang 1" and installed on the "Tianyi" at the designed position. The bow bracket is connected to the hull using 8 connecting bases and is fastened with 288 M36-12 grade bolts with a bolt tightening torque of 2300 N·m, and equipped with double nuts.

[0062] ③ Lift the 8 sets of movable pulleys to the top of the crane boom 1. During the lifting process, arrange for a dedicated person to observe the posture of the pulley sets to ensure that the gap between the pad shaft hole and the fixed seat shaft hole is controlled within ±50mm. Then fix the 8 sets of movable pulleys to the top of the crane boom 1 and install the ebony joint fixing device.

[0063] ④ Move the "Tianyi" crane vessel to the designated position on the vertical stand and anchor it, with an anchor length of 550m. After this, once the "Yingshang 1" crane vessel enters the collapsed area, two anchoring boats will assist in anchoring it, with an anchor length of 500m and a distance of 18m between the two vessels. Note that the anchor line of the "Yingshang 1" must be positioned above the anchor line of the "Tianyi".

[0064] After anchoring, the "Yingshang 1" hoisted its anchor and moved to the bow of the "Tianyi" ship, about 18m away. Then, it lowered the tilting hoist 7 and connected it to the tilting lifting point of the "Tianyi" crane vessel. At this time, the "Yingshang 1" crane boom 1 was at an angle of 60° and had a rated lifting capacity of 1600t.

[0065] ⑤ Tension the rear tie rod 15 using the hydraulic pump station and the rear tie rod tensioning cylinder until a gap appears between the elongated hole at the lower end of the rear tie rod 15 and the round hole on the rear tension rod connecting hinge seat on the second rod body 142. Press the retraction button for the insertion pin 152 on the control panel. Then slowly release the load on the rear tie rod tensioning cylinder until the tension of the rear tie rod tensioning cylinder returns to zero. Then operate the extension button of the rear tie rod push cylinder to make the lower end structure of the rear tie rod 15 retract from the rear tension rod connecting hinge seat on the middle support rod 14. Note that the extension distance of the rear tie rods 15 on the left and right sides should be consistent to ensure that the left and right rear tie rods 15 rotate basically synchronously.

[0066] ⑥ Under the protection of the floating crane's load, the collapsing cylinder 3 pushes the collapsing section of the structure to continue rotating around the first hinge shaft 101 to 7.6°. When the tilting angle is less than 3°, the floating crane's wire rope is kept taut; when the tilting angle reaches 3°, the floating crane actively loads 100 tons (excluding the weight of the tilting lifting device 7); as the tilting angle increases from 3° to 7.6°, the floating crane load is maintained between 100 and 200 tons (excluding the weight of the tilting lifting device 7). The target angle of the floating crane load can be set in the monitoring system. An inclinometer is installed on the "Tianyi" crane boom 1. When the collapsing reaches the preset angle, the system automatically prompts the operator to start the floating crane loading operation.

[0067] ⑦ After the collapsed structure reaches 7.6°, the floating crane actively loads it to 592t (excluding the weight of lifting gear 7, which is 141t). Then, the collapsed cylinder 3 is unloaded and set to floating state, gradually transferring the load on the collapsed cylinder 3 to the floating crane until the cylinder load is 0. At this time, the floating crane load is approximately 733t (including the weight of lifting gear 7, which is 141t). When the cylinder load is 0, the collapsed cylinder 3 is temporarily fixed using a hand-operated hoist and slings. The collapsed cylinder 3 will not shake when the hinge shaft is loosened to prevent it from hitting other parts. The collapsed cylinder 3 is then adjusted to floating mode, the lower hinge shaft retainer is removed, the lower hinge shaft is withdrawn, and then the floating state of the collapsed cylinder 3 is closed. After retracting the collapsed cylinder 3, it is placed stably on the cylinder support seat.

[0068] ⑧ The 1600t floating crane continues to lower the collapsed structure, while the eight main hoisting winches loosen the main hoisting wire ropes until the collapsed structure is close to the bow support. The crossbeam and the first hinge shaft 101 are adjusted according to the lateral position of the collapsed structure. After the collapsed section is placed on the bow support, welds are made between the crossbeam and the longitudinal beam, and between the first hinge shaft 101 and the crossbeam. At this point, the collapsed section of the crane boom 1 has rotated 86.4° around the φ446mm hinge shaft. Then, the rear tie rod rotation drive cylinder 2 is operated to lower the rear tie rod 15 and place it on the rear tie rod support seat 4 on the central support rod 14.

[0069] ⑨ After the weight of the collapsed structure of "Tianyi" is fully applied to the bow bracket, adjust the ballast condition of "Tianyi" to: forward ballast tank (left): 250 tons, forward ballast tank (right): 250 tons; middle ballast tank (left): 200 tons, forward ballast tank (right): 200 tons; aft ballast tank (left): 565 tons, aft ballast tank (right): 440 tons, so that the bow of "Tianyi" is tilted by about 1.05m (bow draft: about 3 meters, stern draft: about 4.05 meters), and adjust the tension of the positioning anchor of "Tianyi" in a timely manner to ensure the stable positioning of "Tianyi". After the collapse is completed, the main hoisting winch of "Tianyi" before towing will tension the 8 main hoisting wire ropes, control the tension of the wire rope at the winch end to 5 tons, and remove the connection between the floating crane's tilting lifting device 7 and the top lifting point of the crane boom 1.

[0070] 3. Construction method for erecting the crane boom of the "Tianyi" crane vessel ① Preparations: Move the "Tianyi" crane vessel to the designated position on the erection site and anchor it. The anchor length is 550m. After this, once the "Yingshang 1" crane vessel enters the erection area, two anchoring boats will assist in anchoring it. The anchor length is 500m, and the two vessels will be 69m apart. Note that the anchor line of the "Yingshang 1" must be placed above the anchor line of the "Tianyi".

[0071] After anchoring, the "Yingshang 1" needs to be moved to the bow of the "Tianyi" ship, approximately 69 meters away. Then, the tilting hoist 7 is lowered and connected to the tilting lifting point on the top frame 13 of the "Tianyi" crane vessel. At this point, the "Yingshang 1" crane boom 1 is at an angle of 60°, with a rated lifting capacity of 1600t. After connection, the rear tie rod is used to rotate the drive cylinder 2 to push the rear tie rod 15 to the designed position, which can be measured using a horizontal distance measuring instrument (to avoid collision between the rear tie rod 15 and the central support rod 14 during the erection process).

[0072] ② The "Yingshang 1" crane will lift the collapsed structure, with a lifting weight of approximately 1480t (based on on-site testing). Simultaneously, the bow of the ship will be anchored closer to the "Tianyi" until the collapsed structure of the "Tianyi" rotates 78.8° (from 86.4° to 7.6°) around the Φ446 hinge axis. During the erection process, carefully observe the condition of the "Tianyi" wire rope, checking for any interference with the original structure. Any interference should be reported immediately. The test commander will promptly instruct the "Tianyi" to adjust the wire rope tension. To control the hook tilt angle of the "Yingshang 1" during erection to not exceed 5°, the rotation angle of the "Tianyi" collapsed structure and the anchoring distance of the "Yingshang 1" should be as follows: Table 1. Statistics on the Movement of the "Yingshang 1" Anchor ③ After the collapsing structure rotates to the designated position, "Yingshang 1" maintains its load-bearing state. The collapsing cylinder 3 extends and retracts to the hinge position. Using a hand-operated hoist, slings, and hydraulic system, the position and stroke of the collapsing cylinder 3 are adjusted so that the lower hinge hole of the collapsing cylinder 3 is aligned with the hinge hole on the base frame 11. After adjusting the collapsing cylinder 3 to the floating state, the hinge shafts of the collapsing cylinder 3 on the port and starboard sides are installed, and the clamping plates and locking plates are installed (to fix the hinge shafts). Then, the hand-operated hoist and slings are released, and the floating state of the collapsing cylinder 3 is released. At this time, the floating crane maintains a stable load. After the hinge shafts are fixed, the load is transferred. Under the protection of the floating crane's load, the force on the collapsing cylinder 3 gradually increases to 759t, and the floating crane's pulling force gradually decreases to 241t. The Tianyi No. 1 crane boom 1 structure is erected from 7.6° to 3°. During the load transfer process, the system monitors the cylinder stroke and output load, the angle of boom 1, and the lifting data of "Yingshang 1" in real time to ensure that the cylinder stroke and the angle of boom 1 do not change significantly, and the cylinder output load / "Yingshang 1" lifting data gradually increases / decreases without any sudden changes in value.

[0073] ④ After the load transfer is completed, with the floating crane bearing the weight of the lifting device 7 under a safe condition, the tilting cylinder 3 pulls the tilting structure until the column 12 of the Tianyi No. 1 crane boom 1 is erected from 3° to 0° by retracting the cylinder. When fitting the upper and lower flanges together, pay attention to the alignment of the locating pin holes on the upper and lower flanges. After fitting them together, first install the locating pins to ensure that the bolts can be installed normally.

[0074] ⑤ After the column 12 is erected, adjust the rear tie rod 15 to the installation position. By tensioning the rear tie rod 15, a gap is created between the elongated hole at the lower end of the rear tie rod 15 and the round hole on the pin mounting seat 153 of the middle support rod 14 (observe the marking line). At this time, use the pin to install the pin 152 at the lower end of the rear tie rod 15 using the hydraulic cylinder. After installation, remove the tilting hoist 7 from the top frame 13, remove the 600t shackle, adjust the tilting platform to a horizontal state, and place the tilting hoist 7 in the designated position.

[0075] ⑥ Tighten the flange connecting bolts at the collapsing hinge of column 12 and the flange connecting bolts at the middle of the middle support rod 14, with a tightening torque of 550 N·m. After completion, unload the collapsing cylinder 3 to make it float, and pull out the lower hinge shaft of the collapsing cylinder 3 and the lower hinge shaft of the first support rod 5 of the lifting boom 1. Remove the locking device of the black head and the fixing device of the 8 main lifting wire ropes. Lock the spiral buckle of the fixing device of the top support beam of the bow bracket. Remove the fixing devices of the 6 sets of movable pulleys and 8 sets and store them properly. Then install the connecting hinge shaft of the 6 sets of movable pulleys and 8 sets and the lifting beam spreader.

[0076] ⑦ After the "Tianyi" was flipped, the screw fastener of the top support beam fixing device of the bow bracket was locked. The "Yingshang 1" lifted the bow bracket as a whole. After the transport ship went to the flipping area, the bow bracket was transported away from the construction sea area.

[0077] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bridge-crossing device for tilting the boom of a floating crane-assisted crane vessel, characterized in that, Includes the lifting boom, the rear tie rod rotation drive cylinder, and the tilting cylinder, wherein: The crane boom includes a base frame, a column, a top frame, a center strut, and a rear tie rod. The base frame is fixedly installed on the deck of the crane vessel. The lower end of the column is hinged to the base frame via a horizontal first hinge shaft, and the top frame is fixedly installed on the upper end of the column. The center strut includes a first rod and a second rod. The lower end of the first rod and the upper end of the second rod are detachably connected together. The upper end of the first rod and the lower end of the second rod are respectively fixedly installed on the column and the base frame. The upper end of the rear tie rod is hinged to the top frame via a second hinge shaft, and the lower end of the rear tie rod is detachably installed on the second rod. The center strut is located between the column and the rear tie rod. The cylinder body of the rear tie rod rotation drive cylinder is hinged to the first rod via a third hinge shaft, and the output shaft of the rear tie rod rotation drive cylinder is hinged to the rear tie rod via a fourth hinge shaft to drive the rear tie rod to rotate around the center line of the second hinge shaft. The cylinder body of the reclining cylinder is hinged to the base frame via a fifth hinge shaft, and the output shaft of the reclining cylinder is hinged to the column via a sixth hinge shaft to drive the column to rotate around the center line of the first hinge shaft by a set angle. The fifth hinge shaft is detachably connected to the base frame and the column respectively. The first to sixth hinge axes are parallel to each other.

2. The bridge crossing device for tilting the boom of a floating crane-assisted crane vessel according to claim 1, characterized in that, The lower end of the rear pull rod is detachably mounted on the second rod body via a plug pin; The lower end of the rear pull rod is provided with a first pin hole, and the lower end of the second rod is provided with a plug-in pin mounting seat. The plug-in pin mounting seat is provided with a second pin hole that mates with the first pin hole. The lower end of the rear pull rod extends into the plug-in pin mounting seat. After the plug-in pin passes through the first pin hole and the second pin hole, the lower end of the rear pull rod is detachably mounted on the base frame.

3. The bridge crossing device for tilting the boom of a floating crane-assisted crane vessel according to claim 2, characterized in that, It also includes the rear tie rod tensioning cylinder and the pin removal and assembly cylinder; The insertion pin mounting seat is installed on the second rod body, and the cylinder body of the rear tie rod tensioning cylinder is installed on the insertion pin mounting seat. The first pin hole is an elongated hole, and the length direction of the elongated hole is consistent with the length direction of the rear tie rod. The output shaft of the rear tie rod tensioning cylinder is connected to the rear tie rod, and the output shaft of the rear tie rod tensioning cylinder is aligned with the length direction of the rear tie rod. When the output shaft of the rear tie rod tensioning cylinder extends, it tensions the rear tie rod, thereby causing the rear tie rod to undergo elastic deformation. This facilitates the insertion and removal pins to be pushed into the first pin hole and the second pin hole after the lower end of the first pin hole reaches a set position. After the output shaft of the rear tie rod tensioning cylinder retracts and the tension force acting on the rear tie rod is released, the rear tie rod retracts, thereby allowing the lower end of the first pin hole to engage with the second pin hole to clamp the insertion and removal pin. The cylinder body of the insert pin removal and installation cylinder is mounted on the base frame. The output shaft of the insert pin removal and installation cylinder is coaxially connected to the insert pin for pushing the insert pin into the first pin hole and the second pin hole and pulling the insert pin out of the first pin hole and the second pin hole.

4. The bridge crossing device for tilting the boom of a floating crane-assisted lifting vessel according to claim 2, characterized in that, It also includes a rear pull rod ejection cylinder, the cylinder body of which is mounted on the second rod body for ejecting the rear pull rod from the insert pin mounting seat.

5. The bridge crossing device for tilting the boom of a floating crane-assisted crane vessel according to claim 1, characterized in that, The movable pulley assembly installed on the top frame is fixed to the top frame by a movable pulley fixing device to ensure the structural stability of the movable pulley assembly during the flipping process and to prevent the steel wire rope connected to the movable pulley assembly from being removed. The movable pulley fixing device is detachably installed on the top frame.

6. The bridge crossing device for tilting the boom of a floating crane-assisted crane vessel according to claim 1, characterized in that, It also includes a first strut and a second strut located below the first strut; The upper and lower ends of the first support rod are fixedly connected to the top frame and the first rod body, respectively. The lower and upper ends of the second support rod are fixedly connected to the lower end of the column and the first rod body, respectively, so that the load force borne by the pulley installed on the top frame is transmitted to the base frame through the lower end of the column.

7. The bridge crossing device for tilting the boom of a floating crane-assisted lifting vessel according to claim 1, characterized in that, It also includes a hand chain hoist connected to the cylinder body of the reclining cylinder to temporarily fix the reclining cylinder after the fifth hinge shaft is removed from the reclining cylinder and the base frame.

8. The bridge crossing device for tilting the boom of a floating crane-assisted crane vessel according to claim 1, characterized in that, It also includes a real-time monitoring system for the tilting and erection construction, used to monitor the tilting angle of the column, the hydraulic pressure of the tilting cylinder, and the stroke of the output shaft of the tilting cylinder.

9. The method for crossing a bridge using the floating crane-assisted boom tilting device as described in any one of claims 1 to 8, characterized in that, Includes the following steps: 1) The bridge-crossing device is installed on the crane vessel. Initially, the column is in a vertical position. The steps for lowering the column are as follows: 1.1) Connect a lifting device to the top frame for a floating crane with sufficient lifting height and capacity so that the floating crane can assist in tilting the column; 1.2) After operation, the output shaft of the tie rod tensioning cylinder extends, tensioning the tie rod and causing it to undergo elastic deformation, providing a clearance for the removal of the insertion pin; 1.3) Operate the plug-in pin disassembly cylinder to pull out the plug-in pin connecting the rear pull rod and the second rod body, so that the lower end of the rear pull rod is separated from the second rod body; 1.4) The tensioning cylinder of the rear tie rod releases the tension applied to the rear tie rod; 1.5) Disconnect the first and second rods of the central strut; 1.6) Activate the tilting cylinder. Under the protection of the floating crane's load, the tilting cylinder pushes the column, and the column rotates around the center line of the first hinge axis by a set angle, so that the column passes the tilting point. After passing the tilting point, the column can be tilted under its own weight and thus fall down. During the process of falling down the column, the tilting angle of the column is monitored by the inclinometer sensor installed on the column. The output load of the tilting cylinder and the displacement of the output shaft of the tilting cylinder are monitored by the force sensor I and displacement sensor installed on the tilting cylinder, respectively. The lifting force of the lifting device is monitored by the force sensor II installed on the floating crane's lifting device. 1.7) The floating crane's spreader continues to hold the top frame, and the fifth hinge shaft connecting the tilting cylinder and the base frame is disassembled. Instead, the floating crane gradually lowers the column until it is placed stably on the bracket at the bow of the crane vessel. In this way, the navigation height of the crane boom is significantly reduced, and the overturned crane boom can pass through height-restricted bridges that are lower than the height of the crane boom before overturning.

10. The method for crossing a bridge using the floating crane-assisted boom tilting device according to claim 9, characterized in that, This bridge crossing method also includes: 2) After the crane vessel and crane boom have passed the bridge, erect the columns as follows: 2.1) The column is suspended and gradually raised by the lifting device of the floating crane, so that the column rotates around the center line of the first hinge axis; 2.2) After the column flips to the set angle, it reaches the flipping and collapsing point, and the collapsing cylinder and the base frame are reconnected through the fifth hinge shaft; 2.3) The column is pulled by the reclining cylinder, and with the assistance of the lifting device of the floating crane, the column is flipped to the initial vertical state. At the same time, the lower end of the rear tie rod also extends into the plug-in pin mounting seat on the second rod. The first and second rods of the middle support rod are also connected together. During the process of the column flipping to the initial vertical state, the tilt sensor installed on the column monitors the column flipping angle. The force sensor I and displacement sensor installed on the reclining cylinder monitor the output load of the reclining cylinder and the displacement of the output shaft of the reclining cylinder, respectively. The force sensor II installed on the lifting device of the floating crane monitors the lifting force of the lifting device. 2.4) The first and second rods of the middle support rod are detachably connected together; 2.5) The rear tie rod tensioning cylinder extends to tension the rear tie rod so that the first pin hole at the lower end of the rear tie rod reaches the set position, so that the insertion pin can be installed in the first pin hole and the second pin hole; 2.6) Operate the plug-in pin disassembly and assembly cylinder to push the plug-in pin connected to the output shaft of the plug-in pin disassembly and assembly cylinder into the first pin hole and the second pin hole. 2.7) Retract the rear tie rod tensioning cylinder to release the tension on the rear tie rod, causing the rear tie rod to retract. Use the hole wall of the first pin hole to cooperate with the hole wall of the second pin hole to clamp the insertion pin, thereby making the rear tie rod and the insertion pin mounting seat detachably connected together. 2.8) Remove the fixing device of the movable pulley block locked on the top frame to restore the normal lifting operation capability of the crane ship.

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