Method for replacing hoisting by pull rod after general assembly of quay crane

Abstract

The invention provides a method for replacing hoisting by a pull rod after general assembly of a quay crane, relates to the field of hoisting of quay cranes, and aims to solve the problem that the hoisting height of an upper component of the quay crane is limited in the prior art, after the upper component of the quay crane is installed according to normal procedures in the general assembly stage of the upper component of the quay crane, an inhaul cable is installed and tensioned between a rear girder and a rear pull rod supporting frame; the rear girder structures on the two sides of the rear pull rod supporting frame are balanced, the first rear pull rod between the trapezoidal frame and the rear pull rod supporting frame can be temporarily dismounted, the moving space of hoisting equipment arranged for hoisting the quay crane upper assembly is enlarged, interference between the quay crane upper assembly and the hoisting equipment is reduced, and the hoisting height is indirectly increased; therefore, the performance range of large hoisting equipment is widened, the hoisting path is optimized, and the hoisting and mounting requirements of the quay crane upper assembly are met.

Description

Technical Field

[0001] The invention relates to the field of quay crane hoisting, and in particular to a quay crane assembly rear tie rod replacement hoisting method. Background Art

[0002] In the manufacturing process of the quay crane, the hoisting of the upper components (including the main beam, ladder frame, rear tie rod, etc.) is the core process of the final assembly stage. In the traditional process, the gantry crane is the main hoisting equipment, and there is a risk of coupling interference between its operating height and the structural height of the upper components of the quay crane. Specifically, when the height of the main structure of the quay crane exceeds the effective lifting space of the gantry crane, the installation position of components such as the rear tie rod will form a physical conflict with the main beam of the gantry crane, making the conventional hoisting plan impossible to implement.

[0003] The existing technology usually adopts the following three methods to solve this problem: one is to install the upper components of the quay crane separately, decompose the upper components of the quay crane into multiple sub-components, hoist them in batches, and then weld and assemble them on site. Although this method can avoid structural interference, it significantly prolongs the on-site construction period (an average increase of 15-20 working days), and the high-altitude welding operation increases the quality risk (according to statistics, the weld defect rate increases by about 12%). The second is to rent a large-tonnage crawler crane and replace the gantry crane with a crawler crane with a larger lifting height to complete the key lifting. However, the daily rental cost of the crawler crane is as high as 3-5 times that of a conventional gantry crane, and due to the load-bearing limit of the port site, the port site needs to be reinforced to meet the operation requirements of the crawler crane, and additional foundation reinforcement costs are invested. The third is the self-lifting quay crane design, which integrates a hydraulic jacking mechanism in the quay crane body to enable the upper components to have a self-lifting function. Although it can avoid dependence on external lifting equipment, it leads to an increase in the complexity of the overall structure and maintenance costs. In addition, some customers refuse to adopt such non-standard designs for reliability considerations. The above methods all have significant defects: the installation of scattered parts sacrifices efficiency, the crawler crane solution pushes up economic costs, and the self-lifting design reduces market universality. More importantly, in the traditional process, the rear tie rod is a rigid connecting component, and its installation sequence and space occupation cannot be adjusted, which fundamentally restricts the optimization space of the lifting path. Summary of the invention

[0004] The purpose of the present invention is to address the defects of the prior art and to provide a method for replacing the lifting of the rear tie rods of the quay crane assembly, which can temporarily remove the first rear tie rod between the ladder frame and the rear tie rod support frame, thereby increasing the activity space of the lifting equipment arranged for lifting the upper components of the quay crane, reducing the interference between the upper components of the quay crane and the lifting equipment such as the main beam of the gantry crane, indirectly increasing the lifting height, and meeting the lifting and installation requirements of the upper components of the quay crane.

[0005] In order to solve the above problems, the following solutions are adopted:

[0006] A method for replacing the rear tie rod for quay crane assembly, comprising:

[0007] After the upper components of the quay crane are assembled, cables are pre-connected between the position where the rear beam connects to the ladder frame and the top of the rear tie rod support frame;

[0008] Load the tail of the rear beam and tension the cables to balance the rear beams on both sides of the rear tie rod support frame;

[0009] Disconnect the first rear tie rod and the rear tie rod support frame between the ladder frame and the rear tie rod support frame, and place the first rear tie rod on the rear support rod, and remove the load at the rear end of the rear beam;

[0010] Arrange the lifting equipment between the ladder frame and the rear tie rod support frame, lift the upper components of the quay crane, and avoid the lifting equipment with the first rear tie rod;

[0011] After the upper components of the quay crane are hoisted to the door frame and connected, load the tail of the rear beam, restore the connection between the first rear tie rod and the rear tie rod support frame, loosen the cable and remove the load at the tail of the rear beam.

[0012] Furthermore, the rear tie rod support frame of the upper assembly of the quay crane is strengthened, and the cable installation hinge points are reserved at the cable connection position of the rear tie rod support frame and the cable connection position of the rear beam.

[0013] Furthermore, a tensioning assembly is installed at the cable installation hinge point reserved at the position where the rear beam is connected to the ladder frame. The tensioning assembly is connected to the cable through a connecting plate, and the cable is tensioned by the tensioning assembly.

[0014] Furthermore, balancing the rear beams on both sides of the rear tie rod support frame includes:

[0015] When the rear end of the rear beam is loaded, slowly load and observe the bending of the second rear tie rod connected between the rear end of the rear beam and the rear tie rod support frame;

[0016] When the second rear tie rod is bent, stop loading and measure the inclination of the rear tie rod support frame in the sea and land directions;

[0017] Adjust the tension of the cable according to the inclination until the load carried by the tail of the rear beam reaches the set value, then stop tensioning the cable to achieve balance of the rear beam on both sides of the rear tie rod support frame.

[0018] Furthermore, the inclination of the rear tie rod support frame in the sea and land directions is measured and recorded as the A value. During the cable adjustment process, the inclination of the rear tie rod support frame in the sea and land directions and the load on the tail of the rear beam continue to be detected. When the A value begins to increase and the load on the tail of the rear beam approaches zero, stop tightening the cable.

[0019] Furthermore, when disconnecting the first rear tie rod and the rear tie rod support frame, first lift one end of the first rear tie rod connected to the rear tie rod support frame, remove the hinge between the first rear tie rod and the rear tie rod support, and then rotate the first rear tie rod down to the rear support rod and fix it.

[0020] Furthermore, a gantry crane is used to hoist the upper components of the quay crane. During the hoisting process, the pitch wire rope and the gantry crane main beam are kept at a set distance to avoid interference.

[0021] Further, the restoring the connection between the first rear tie rod and the rear tie rod support frame includes:

[0022] Lift the first rear tie rod placed on the rear support rod, and when the first rear tie rod is aligned with the hinge point hole on the rear tie rod support frame, perform the shaft threading operation to realize the reinstallation of the first rear tie rod.

[0023] Furthermore, the first rear tie rod is hoisted using a cantilever crane pre-installed on the rear tie rod support frame. During the axle threading operation, the load at the tail of the rear beam is fine-tuned to ensure smooth axle threading operation.

[0024] Furthermore, after the cable is relaxed, the cable, the hinge point of the rear pull rod support frame, and the tensioning assembly for tensioning the cable are removed and lowered to the ground.

[0025] Compared with the prior art, the present invention has the following advantages and positive effects:

[0026] In response to the current problem of limited lifting height of the upper components of the quay crane, after completing the installation of the upper components of the quay crane according to normal procedures during the general assembly stage of the upper components of the quay crane, cables are installed and tensioned between the rear beam and the rear tie rod support frame to balance the rear beam structure on both sides of the rear tie rod support frame. The first rear tie rod between the ladder frame and the rear tie rod support frame can be temporarily removed, thereby increasing the activity space between the lifting equipment arranged for lifting the upper components of the quay crane, such as the gantry crane main beam, avoiding interference between the upper components of the quay crane and the gantry crane main beam, and indirectly increasing the lifting height, thereby increasing the performance range of large-scale lifting equipment, optimizing the lifting path, and meeting the lifting and installation requirements of the upper components of the quay crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 It is a schematic diagram of the initial state of the quay crane when the tie rod replaces the lifting after the final assembly of the quay crane in Example 1 of the present invention.

[0029] Figure 2 It is a schematic diagram of lifting the first rear tie rod during the replacement of the rear tie rod for the final assembly of the quay crane in Example 1 of the present invention.

[0030] Figure 3 It is a schematic diagram of adjusting the position of the first rear tie rod during replacement hoisting of the quay crane assembly rear tie rod in Example 1 of the present invention.

[0031] Figure 4 It is a schematic diagram of the door frame of the upper assembly of the quay crane when the rear tie rod replaces the lifting in the final assembly of the quay crane in Example 1 of the present invention.

[0032] Figure 5 This is a schematic diagram of the rear tie rod after it is reset during the replacement hoisting of the rear tie rod of the quay crane assembly in Example 1 of the present invention.

[0033] Figure 6 This is a schematic diagram of the gantry crane being connected to the rear beam through a sling when the rear tie rod replaces the hoisting during the final assembly of the quay crane in Example 1 of the present invention.

[0034] In the figure, 1. front beam; 2. first rear tie rod; 3. rear tie rod mounting hinge; 4. cable mounting hinge; 5. rear tie rod support frame; 6. rear beam tail hanging point; 7. rear beam; 8. pitch wire rope; 9. rear support rod; 10. cable; 11. tensioning assembly; 12. connecting plate; 13. gantry crane; 14. door frame; 15. sling; 16. shackle; 17. second rear tie rod; 18. ladder frame. DETAILED DESCRIPTION

[0035] Example 1

[0036] In a typical embodiment of the present invention, Figure 1-Figure 6 As shown, a lifting method replacing the rear tie rod of the quay crane assembly is given.

[0037] A method for replacing the rear tie rod for quay crane assembly, comprising:

[0038] After the upper components of the quay crane are assembled, the cable 10 is pre-connected between the position where the rear beam 7 is connected to the ladder frame 18 and the top of the rear tie rod support frame 5;

[0039] Load the tail of the rear beam 7 and tension the cable 10 to balance the rear beam 7 on both sides of the rear tie rod support frame 5;

[0040] Disconnect the first rear tie rod 2 and the rear tie rod support frame 5 between the ladder frame 18 and the rear tie rod support frame 5, and place the first rear tie rod 2 on the rear support rod 9, and remove the load at the rear end of the rear beam 7;

[0041] Arrange the lifting equipment between the ladder frame 18 and the rear tie rod support frame 5 to lift the upper components of the quay crane, and the first rear tie rod 2 avoids the lifting equipment;

[0042] After the upper components of the quay crane are hoisted to the door frame 14 and connected, the load is carried at the tail of the rear beam 7, the connection between the first rear tie rod 2 and the rear tie rod support frame 5 is restored, and the load carried at the tail of the rear beam 7 is removed after the cable 10 is loosened.

[0043] This embodiment is intended to ensure that when conventional lifting equipment is used to lift the upper components of the quay crane, some interference between the lifting equipment and the upper components of the quay crane can be avoided, thereby achieving the purpose of increasing the lifting height. The lifting equipment in this embodiment can adopt a gantry crane 13. When the gantry crane 13 is between the ladder frame 18 and the rear tie rod support frame 5 to lift the upper components of the quay crane, the position of the first rear tie rod 2 avoids the activity space of the main beam of the gantry crane 13.

[0044] The rear tie rod support frame 5 of the quay crane is strengthened during the design stage, and a cable 10 installation hinge 4 is reserved on the rear beam 7 and the rear tie rod support frame 5 in advance. After the assembly of the upper components of the quay crane is completed according to normal procedures during the general assembly stage of the upper components of the quay crane, the cable 10 and the tensioning assembly 11 matching the cable 10 are installed between the reserved cable 10 installation hinge 4 of the rear beam 7 and the reserved cable 10 installation hinge 4 at the top of the rear tie rod support frame 5. Subsequently, the upper components of the quay crane are hoisted to the door frame 14 using hoisting equipment, and then the installation of the first rear tie rod 2 in the upper section is restored, and the cable 10 and the tensioning assembly 11 used to replace the first rear tie rod 2 are removed.

[0045] A method for replacing the lifting of the tie rod after the final assembly of a quay crane specifically comprises the following steps:

[0046] (1) Strengthening of the rear tie rod support frame 5 and the reservation of the hinge point 4 for the cable 10

[0047] During the design stage of the upper components of the quay crane, the rear tie rod support frame 5 originally used to support the rear tie rod connecting plate 12 needs to be structurally reinforced to ensure that after the rear tie rod is subsequently replaced by the cable 10, the structural strength of the rear tie rod support frame 5 is sufficient to support the weight of the rear half of the entire upper components of the quay crane.

[0048] like Figure 1As shown, the upper component of the quay crane includes a front beam 1 and a rear beam 7 which are hinged to each other. The end of the rear beam 7 close to the front beam 1 is the bow, and a ladder frame 18 is installed at the bow. The tail of the rear beam 7 is provided with a rear beam tail suspension point 6, and a rear tie rod support frame 5 is installed in the middle of the rear beam 7. The top of the rear tie rod support frame 5 is provided with a rear tie rod installation hinge 3 and a cable 10 installation hinge 4. The rear tie rod is divided into two sections. The first rear tie rod 2 is located between the ladder frame 18 and the rear tie rod support frame 5, and the second rear tie rod 17 is located between the rear tie rod support frame 5 and the tail of the rear beam 7. One end of the first rear tie rod 2 is hinged to the top of the ladder frame 18, and the other end is hinged to the rear tie rod installation hinge 3; one end of the second rear tie rod 17 is hinged to the top of the rear tie rod support frame 5, and the other end is hinged to the rear beam tail suspension point 6. A cable 10 mounting hinge 4 is provided at the position where the rear beam 7 is connected to the ladder frame 18 , so as to facilitate the connection of the cable 10 .

[0049] In addition, some core working components of the quay crane are also installed on the rear beam 7, such as the pitch wire rope 8 that passes over the pulley on the top of the ladder frame 18 and then connects to the front beam 1.

[0050] (2) Installation of cable 10

[0051] like Figure 2 As shown, after the upper components of the quay crane are installed according to normal procedures, the cable 10 for replacing the first rear tie rod 2 is installed.

[0052] First, the cable 10 is connected to the tensioning assembly 11 , and the tensioning assembly 11 and the cable 10 are connected using a connecting plate 12 , and the tensioning assembly 11 is loosened to the longest length.

[0053] Among them, the tensioning assembly 11 for tensioning the cable 10 can adopt mechanical tensioning equipment, such as MS15 prestressed cable 10 tensioner, cam tensioning device, etc., or electric tensioning equipment, such as motor-driven winding tensioning equipment, electric tensioning equipment with force measurement function, etc. Intelligent tensioning equipment can also be used, such as the tensioning mechanism in the cable 10 take-up device of Tianjin Dejia, the cable 10 connecting device with adjustable tensioning function, etc., which can be selected and used according to on-site needs. The cable 10 can adopt flexible cables such as steel strands and wire ropes to meet strength requirements.

[0054] Then, use a car crane to connect the end of the cable 10 without the tensioning assembly 11 to the cable 10 installation hinge 4 on the upper section of the rear tie rod support frame 5. Connect the tensioning assembly 11 to the cable 10 installation hinge 4 reserved on the rear beam 7.

[0055] After the cable 10 is installed, the tensioning assembly 11 is not tensioned, and then the first rear tie rod 2 is removed.

[0056] (3) Removal of the first rear tie rod 2

[0057] like Figure 3 As shown, a gantry crane 13 is used to carry load at the tail of the rear beam 7. During the process, the load should be loaded slowly and the bending of the second rear tie rod 17 should be observed. When the second rear tie rod 17 is bent, the load should be stopped and a theodolite should be used to measure the inclination of the rear tie rod support frame 5 in the sea and land directions and record it as the A value.

[0058] like Figure 6 As shown, the gantry crane 13 is connected to the tail of the rear beam 7 through a sling 15 and a shackle 16.

[0059] The cables 10 are tensioned by the tensioning assembly 11. The cables 10 on both sides should be tensioned at the same time to prevent the rear tie rod support frame 5 from being pulled and twisted. During the process, the theodolite should continue to be used to detect the inclination of the rear tie rod support frame 5 in the sea and land direction and the load of the gantry crane 13 at the tail of the rear beam 7. When the A value begins to increase and the load of the gantry crane 13 approaches zero, stop tensioning the cables 10. Use a car crane to remove the hinge between the first rear tie rod 2 and the rear tie rod support, and place the first rear tie rod 2 on the rear support rod 9.

[0060] At this point, the rear tie rod is removed and the gantry originally arranged at the tail of the rear beam 7 for carrying loads is removed.

[0061] (4) Lifting of upper components

[0062] like Figure 4 As shown, the upper components of the quay crane are hoisted onto the door frame 14 using the gantry crane 13. During the process, observe and ensure that the distance between the pitch wire rope 8 and the main beam of the gantry crane 13 is always greater than 1 m to avoid interference.

[0063] (5) Reinstallation of the rear tie rod

[0064] like Figure 5 As shown, after the upper assembly of the quay crane is hoisted onto the door frame 14 and welding is completed, the rear tie rod reinstallation work begins.

[0065] First, the gantry crane 13 is loaded at the tail of the rear beam 7, and the specific loading value is consistent with the loading value when the rear tie rod is removed. The rear tie rod placed on the rear support rod 9 is lifted by the cantilever crane arranged in advance on the rear tie rod support frame 5. When the rear tie rod is aligned with the hinge point hole on the rear tie rod support frame 5, the shaft threading operation is carried out. During the process, the load of the gantry crane 13 can be fine-tuned to ensure the smoothness of the shaft threading process.

[0066] After the rear tie rod is installed, the gantry crane 13 keeps the load unchanged, and the cable 10 tensioning assembly 11 is released. When the cable 10 tensioning assembly 11 is completely released, the gantry crane 13 is unloaded.

[0067] Use the gantry crane 13 to remove the hinge between the cable 10 and the rear tie rod support frame 5 and lay it flat on the rear beam 7. Then remove the hinge between the tensioning assembly 11 and the rear beam 7, and then use the gantry crane 13 again to hook the cable 10 and the tensioning assembly 11 to the ground.

[0068] This embodiment can further lift the upper components of the quay crane upward by about 5m on the basis of the conventional lifting method, thereby indirectly increasing the lifting height of the gantry crane 13 and indirectly increasing the performance range of large-scale lifting equipment, thereby achieving the purpose of reducing costs and increasing efficiency.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for replacing the tie rod for the final assembly of a quay crane, characterized in that: include: After the upper components of the quay crane are assembled, cables are pre-connected between the position where the rear beam connects to the ladder frame and the top of the rear tie rod support frame; Load the tail of the rear beam and tension the cables to balance the rear beams on both sides of the rear tie rod support frame; Disconnect the first rear tie rod and the rear tie rod support frame between the ladder frame and the rear tie rod support frame, and place the first rear tie rod on the rear support rod, and remove the load at the rear end of the rear beam; Arrange the lifting equipment between the ladder frame and the rear tie rod support frame, lift the upper components of the quay crane, and the first rear tie rod avoids the lifting equipment; after the upper components of the quay crane are lifted to the door frame and connected, load the tail of the rear beam, restore the connection between the first rear tie rod and the rear tie rod support frame, loosen the cable and remove the load at the tail of the rear beam.

2. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to claim 1 is characterized in that: The rear tie rod support frame of the upper assembly of the quay crane is strengthened, and the cable installation hinge points are reserved at the cable connection position of the rear tie rod support frame and the cable connection position of the rear beam.

3. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to claim 2 is characterized in that: A tensioning assembly is installed at the cable installation hinge point reserved for the position where the rear beam is connected to the ladder frame. The tensioning assembly is connected to the cable through a connecting plate, and the cable is tensioned by the tensioning assembly.

4. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to claim 1, 2 or 3, characterized in that: The method of balancing the rear beams on both sides of the rear tie rod support frame includes: When the rear end of the rear beam is loaded, slowly load and observe the bending of the second rear tie rod connected between the rear end of the rear beam and the rear tie rod support frame; When the second rear tie rod is bent, stop loading and measure the inclination of the rear tie rod support frame in the sea and land directions; Adjust the tension of the cable according to the inclination until the load carried by the tail of the rear beam reaches the set value, then stop tensioning the cable to achieve balance of the rear beam on both sides of the rear tie rod support frame.

5. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to claim 4 is characterized in that: Measure the inclination of the rear tie rod support frame in the sea and land direction and record it as the A value. During the cable adjustment process, continue to detect the inclination of the rear tie rod support frame in the sea and land direction and the load at the tail of the rear beam. When the A value begins to increase and the load at the tail of the rear beam approaches zero, stop tightening the cable.

6. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to claim 1 is characterized in that: When disconnecting the first rear tie rod from the rear tie rod support frame, first lift one end of the first rear tie rod connected to the rear tie rod support frame, remove the hinge between the first rear tie rod and the rear tie rod support, then rotate the first rear tie rod down to the rear support rod and secure it.

7. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to claim 1 or 6, characterized in that: Use a gantry crane to lift the upper components of the quay crane. During the lifting process, keep the pitch wire rope and the gantry crane main beam at a set distance to avoid interference.

8. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to claim 1 or 6, characterized in that: The method of restoring the connection between the first rear tie rod and the rear tie rod support frame comprises: Lift the first rear tie rod placed on the rear support rod, and when the first rear tie rod is aligned with the hinge point hole on the rear tie rod support frame, perform the shaft threading operation to realize the reinstallation of the first rear tie rod.

9. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to claim 8, characterized in that: The first rear tie rod is hoisted using a cantilever crane pre-installed on the rear tie rod support frame. During the axle threading operation, the load at the tail of the rear beam is fine-tuned to ensure a smooth axle threading operation.

10. The method for replacing the tie rod for lifting after the final assembly of the quay crane according to any one of claims 1 to 9, characterized in that: After the cables are relaxed, the cables, the hinge points of the rear tie rod support frame, and the tensioning assembly used to tension the cables are removed and lowered to the ground.

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