Large gantry crane superstructure final assembly method

Abstract

The invention belongs to the technical field of wharf equipment, and particularly provides a general assembly method for an upper structure of a large gantry crane, the upper structure comprises a slewing mechanism, a turntable mechanism, a luffing mechanism, a hoisting mechanism, a propeller strut assembly, a machine room enclosure shed and an electrical assembly.The general assembly method comprises the steps that S1, a subassembly site is arranged on a wharf, a subassembly jig frame is arranged on the subassembly site; s2, on the subassembly jig frame, a slewing mechanism, a turntable mechanism, a luffing mechanism, a hoisting mechanism, a propeller strut assembly machine room enclosure shed and an electrical assembly are subassembly into an upper structure; s3, in the high-tide-level environment, the upper structure is hoisted through a floating crane, and the upper structure is hoisted to a portal crane; and S4, after the upper structure and the portal crane are connected in a fastened mode, the floating crane and the upper structure are disconnected. According to the general assembly method, the general assembly efficiency can be effectively improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dock equipment, and in particular to a method for assembling the superstructure of a large portal crane. Background Art

[0002] Currently, some extra-large gantry cranes have a rated lifting capacity of 1,000 tons, a lifting height of 115 meters, and are equipped with two main hooks and one auxiliary hook. Due to the high lifting height and multi-mechanism layout required for this type of gantry crane, the overall dimensions and weight of the superstructure, including the turntable mechanism, hoist winding, and the herringbone structure mounted via the luffing winding pulley, are significantly larger than those of ordinary gantry cranes. Due to their large dimensions, the manufacturing cycle for these extra-large gantry cranes is long. Furthermore, due to their height, a high proportion of high-altitude operations are required during manufacturing, which increases the risks and further prolongs the project manufacturing cycle. Summary of the Invention

[0003] In view of this, the present invention provides a method for assembling the superstructure of a large portal crane, which can improve assembly efficiency, reduce high-altitude operations and lower costs.

[0004] To solve at least one of the above technical problems, the present invention adopts the following technical solutions:

[0005] According to an embodiment of the present invention, a method for assembling the upper structure of a large portal crane includes a slewing mechanism, a turntable mechanism, a luffing mechanism, a lifting mechanism, a herringbone assembly, a machine room enclosure, and electrical components. The method includes:

[0006] Step S1: setting up a sub-assembly site at the wharf and setting up a sub-assembly tire stand on the sub-assembly site;

[0007] Step S2: on the assembly frame, assemble the slewing mechanism, turntable mechanism, luffing mechanism, lifting mechanism, herringbone frame assembly room enclosure and electrical components into the upper structure;

[0008] Step S3: Under high tide conditions, use a floating crane to lift the superstructure and install it on the gantry crane;

[0009] Step S4: After the upper structure and the gantry crane are fastened together, the floating crane is disconnected from the upper structure.

[0010] In one embodiment of the present invention, step S1 includes:

[0011] Step S11: Cast a ground beam at the end of the gantry crane track close to the dock shore, lay a temporary track leading to the dock shore, and move the gantry crane to a predetermined position via the temporary track;

[0012] Step S12: After the gantry crane moves to the predetermined position, the area between the gantry crane and the dock is set as the assembly site;

[0013] Step S13: Setting up a tire assembly stand on the assembly site.

[0014] In one embodiment of the present invention, step S2 includes:

[0015] Step S21: Connect the slewing mechanism and the turntable mechanism on the assembly site, and hoist the slewing mechanism and the turntable mechanism onto the assembly stand;

[0016] Step S22: Adjust the slewing bearing and the turntable mechanism of the slewing mechanism to be horizontal;

[0017] Step S23: hoisting and installing the luffing mechanism and the lifting mechanism into the machine room of the bearing platform on the turntable mechanism;

[0018] Step S24: hoist the A-frame assembly onto the turntable mechanism and connect it to the turntable mechanism;

[0019] Step S25: Install the machine room enclosure to the periphery of the machine room, and install the electrical components into the machine room to complete the installation of the upper structure.

[0020] In one embodiment of the present invention, step S24 further includes:

[0021] A counterweight is cast in the tail box of the turntable mechanism.

[0022] In one embodiment of the present invention, step S3 includes:

[0023] Step S31: hoisting the superstructure using a floating crane under high tide conditions;

[0024] Step S32: After the upper structure reaches the top of the door crane, guide the upper structure using guide pins to align the slewing bearing with the flange bolts of the door crane;

[0025] Step S33: Use the floating crane to control the upper structure to descend to the gantry crane, and connect the upper structure to the gantry crane.

[0026] In one embodiment of the present invention, step S31 includes:

[0027] Multiple lifting points are set on the turntable mechanism, and a floating crane is used to connect the multiple lifting points through steel wire ropes;

[0028] In a high tide environment and when the tide reaches the predetermined level, a floating crane is used to lift the superstructure.

[0029] In one embodiment of the present invention, the floating crane includes a first hook and a second hook, and the first hook and the second hook are respectively located on both sides of the upper structure. The first hook is connected to the lifting point on the corresponding turntable mechanism through a first steel wire rope, and the second hook is connected to the lifting point on the corresponding turntable mechanism through a second steel wire rope.

[0030] In one embodiment of the present invention, step S4 includes:

[0031] Step S41: After the superstructure and the gantry crane are fastened together, controlling the floating crane to lower the first hook to a first predetermined height so that the first steel wire rope is in a slack state, wherein the first predetermined height is higher than the height of the A-frame assembly;

[0032] Step S42: disconnecting the first steel wire rope from the corresponding lifting point, and using a traction device to pull the first steel wire rope to the outside of the superstructure;

[0033] Step S43: Using the hull cable to adjust the angle of the boom of the floating crane so that the first hook moves to the outside of the superstructure;

[0034] Step S44: controlling the floating crane to lower the first hook to the ground, and removing the first steel wire rope connected to the first hook;

[0035] Step S45: Control the floating crane to raise the first hook to a second predetermined height, where the second predetermined height is higher than the height of the A-frame assembly;

[0036] Step S46: Use the hull cable to adjust the angle of the boom of the floating crane so that the second hook moves to just above the corresponding lifting point;

[0037] Step S47: Control the floating crane to lower the second hook to a first predetermined height so that the second steel wire rope is in a relaxed state, and remove the connection between the second steel wire rope and the corresponding lifting point.

[0038] In one embodiment of the present invention, step S44 further includes:

[0039] As the first hook head descends to the ground, the floating crane controls the height of the second hook head to remain unchanged.

[0040] In one embodiment of the present invention, the large portal crane superstructure assembly method further includes:

[0041] Step S5: controlling the hull angle of the vessel on which the floating crane is located so as to shift the entire boom of the floating crane to the outside of the superstructure.

[0042] The above technical solution of the present invention has at least one of the following beneficial effects:

[0043] The present invention provides a method for assembling the upper structure of a large gantry crane. By assembling the slewing mechanism, turntable mechanism, luffing mechanism, hoisting mechanism, A-frame assembly room enclosure, and electrical components on the ground as the upper structure, this method achieves the goal of reducing high-altitude operations to low altitudes, reducing construction risks, and enabling modular assembly of the upper components of the gantry crane, thereby improving the integrity of the component assembly and shortening the assembly cycle. Furthermore, by establishing an assembly site at the dock and using a floating crane to hoist the upper structure onto the gantry crane under high tide conditions, the method can meet the lifting height and rated load requirements without requiring an oversized floating crane with a large lifting height, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a structural diagram of a large portal crane;

[0045] Figure 2 This is a structural diagram of the upper structure of a large portal crane;

[0046] Figure 3 This is a flow chart of a method for assembling a superstructure of a large portal crane according to one embodiment of the present invention;

[0047] Figure 4 A flowchart of setting up a tire frame in accordance with an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the structure of laying ground beams in one embodiment of the present invention;

[0049] Figure 6 This is a schematic diagram of a structure in which a door crane is moved to a predetermined position via a temporary track in one embodiment of the present invention;

[0050] Figure 7 A flow chart showing the installation of a superstructure in the middle of an embodiment of the present invention;

[0051] Figure 8 This is a flow chart of hoisting the superstructure onto the gantry crane in one embodiment of the present invention;

[0052] Figure 9 is a top view of a turntable mechanism according to an embodiment of the present invention;

[0053] Figure 10 This is a schematic structural diagram of a floating crane when the first hook head is lowered in one embodiment of the present invention;

[0054] Figure 11 A flow chart of disconnecting a floating crane from an upper structure in one embodiment of the present invention;

[0055] Figure 12 This is a schematic structural diagram of a floating crane when the second hook head is disconnected from the upper structure in one embodiment of the present invention.

[0056] Figure numerals: 100, superstructure; 110, slewing mechanism; 120, turntable mechanism; 121, tail box; 122, lifting point; 130, boom mechanism; 140, lifting mechanism; 150, herringbone frame assembly; 200, gantry crane; 300, mounting frame; 400, ground beam; 410, temporary track; 500, floating crane; 510, first hook; 511, first wire rope; 520, second hook; 521, second wire rope. DETAILED DESCRIPTION

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0058] First, a method for assembling the superstructure of a large portal crane according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0059] like Figure 1 and Figure 2 As shown in FIG, the method for assembling the upper structure of a large portal crane of the present invention can be applied to the upper structure 100 of a large portal crane, wherein the upper structure 100 is arranged on the portal crane 200, and the upper structure 100 may include a slewing mechanism 110, a turntable mechanism 120, a luffing mechanism 130, a lifting mechanism 140, a herringbone assembly 150, a machine room enclosure (not shown) and electrical components (not shown). Figure 3 As shown, the final assembly method may include:

[0060] Step S1: setting up a sub-assembly site at the wharf and setting up a sub-assembly tire stand on the sub-assembly site.

[0061] In this embodiment, by setting up a sub-assembly site at the dock, it is convenient for the floating crane 500 to perform shore operations. At the same time, by setting up a sub-assembly cradle 300 at the sub-assembly site and using the sub-assembly cradle 300 to assemble the upper structure 100, high-altitude operations can be avoided, while improving safety and facilitating the precise assembly of various components of the upper structure 100. Specifically, Figure 4 As shown, step S1 may include the following steps:

[0062] Step S11: Cast a ground beam at the end of the gantry crane track close to the dock shore, lay a temporary track leading to the dock shore, and move the gantry crane to a predetermined position via the temporary track.

[0063] Specifically, since the lifting height and rated load of the floating crane 500 are affected by the arm width, in order to ensure that the lifting height and rated load of the floating crane 500 can meet the lifting requirements of the upper components, the operating arm width of the floating crane 500 needs to be controlled within a certain range. Figure 5 and Figure 6 As shown, a concrete ground beam 400 can be cast at the end of the original track of the gantry crane 200 and a temporary track 410 can be laid on the ground beam 400, and then the final assembly position of the gantry crane 200 can be moved forward to a position close to the dock shore, thereby ensuring that the final assembly station is within the effective operating range of the boom operating arm of the floating crane 500.

[0064] Step S12: After the gantry crane moves to the predetermined position, the area between the gantry crane and the dock is set as the assembly site.

[0065] In this embodiment, the open area between the gantry crane 200 and the dockside can be functionally divided and leveled, and this area can be set up as a sub-assembly area. This area can be used for sub-assembly of the components of the superstructure 100, and sufficient lifting space is reserved for the floating crane 500. Furthermore, auxiliary facilities such as temporary power supply, lighting, and rainproof tarpaulins are installed in this area as needed to ensure the continuity and safety of the sub-assembly work.

[0066] Step S13: Setting up a tire assembly stand on the assembly site.

[0067] Step S2: On the assembly frame, assemble the slewing mechanism, turntable mechanism, luffing mechanism, lifting mechanism, herringbone frame assembly room enclosure and electrical components into the upper structure.

[0068] In this embodiment, the slewing mechanism 110, turntable mechanism 120, luffing mechanism 130, lifting mechanism 140, herringbone assembly 150, machine room enclosure and electrical components can be assembled into the upper structure 100 on the pre-erected assembly frame 300. This can avoid high-altitude operations, improve safety, and facilitate the precise assembly of the various components of the upper structure 100. Specifically, Figure 7 As shown, step S2 may include the following steps:

[0069] Step S21: On the assembly site, connect the slewing mechanism and the turntable mechanism, and hoist the slewing mechanism and the turntable mechanism onto the assembly tire stand.

[0070] In this embodiment, the slewing mechanism 110 and the turntable mechanism 120 can first be aligned and connected at the assembly site, ensuring that the bolts, pins, and other fasteners at the connection are securely installed. After the connection is completed, the connected slewing mechanism 110 and turntable mechanism 120 can be hoisted as a whole onto the assembly frame 300 using lifting equipment and slowly lowered into position, so that the connected slewing mechanism 110 and turntable mechanism 120 are located in the preset installation position on the assembly frame 300. They can then be tightened to provide a foundation for subsequent connection with other mechanisms.

[0071] Step S22: Adjust the slewing bearing and the turntable mechanism of the slewing mechanism to be horizontal.

[0072] In this embodiment, after the slewing mechanism 110 and turntable mechanism 120 are hoisted integrally onto the sub-mounting frame 300, a level meter or laser measuring instrument can be used to check the levelness of the slewing bearing of the slewing mechanism 110 and the turntable mechanism 120. By adjusting the frame support points or adding adjustment shims at the connection points, the upper surface of the slewing bearing and the mounting surface of the turntable mechanism 120 are ensured to be level. This improves the smoothness of the crane's slewing motion.

[0073] Step S23: hoist the luffing mechanism and the lifting mechanism and install them in the machine room of the bearing platform on the turntable mechanism.

[0074] In this embodiment, lifting equipment can be used to lift the luffing mechanism 130 and the lifting mechanism 140 from the ground to the machine room of the supporting platform on the turntable mechanism 120. After the luffing mechanism 130 and the lifting mechanism 140 are in place, they are fixed to the supporting platform using anchor bolts or connecting flanges.

[0075] Step S24: hoist the A-frame assembly onto the turntable mechanism and connect it to the turntable mechanism.

[0076] In this embodiment, due to the relatively high height of the A-frame assembly 150, positioning marks can be pre-placed on the turntable mechanism 120. The A-frame assembly 150 can then be slowly lowered to its connection point with the turntable mechanism 120 according to the positioning marks. Subsequently, the A-frame assembly 150 can be bolted or welded. After installation, the connection between the A-frame assembly 150 and the turntable mechanism 120 can be inspected for size and verticality to ensure that the installation meets design and construction requirements.

[0077] Step S25: Install the machine room enclosure to the periphery of the machine room, and install the electrical components into the machine room to complete the installation of the upper structure.

[0078] like Figure 2 As shown, in one embodiment of the present invention, step S24 further includes: casting a counterweight in the tail box of the turntable mechanism.

[0079] Specifically, after the A-frame assembly 150 is hoisted onto the turntable mechanism 120 and connected to the turntable mechanism 120, a counterweight can be cast in the tail box 121 of the turntable mechanism 120 according to the overall balance requirements of the crane. This can improve the stability and rotation balance of the turntable structure.

[0080] Step S3: Under high tide conditions, use a floating crane to lift the upper structure and install it on the gantry crane.

[0081] In this embodiment, since the conventional floating crane 500 has a small lifting height margin, in order to ensure smooth unhooking after assembly, assembly can be carried out in a high tide environment, and the rated lifting height of the floating crane 500 can be increased by utilizing the high tide of the high tide. Thus, by using the floating crane 500 to lift the superstructure 100 and hoisting the superstructure 100 onto the gantry crane 200 in a high tide environment, it is possible to avoid installing an oversized floating crane 500 with a large lifting height while meeting the lifting height and rated lifting load, thereby reducing production costs. Specifically, Figure 8 As shown, step S3 may include the following steps:

[0082] Step S31: In a high-tide environment, use a floating crane to lift the upper structure.

[0083] In this embodiment, a high tide date can be selected according to the tide table, and the hooking action of the upper structure 100 can be completed before the high tide, and the hoisting can be performed after the high tide is reached. Figure 9 and Figure 10 As shown, four lifting points 122 can be set on the turntable mechanism 120, and the four lifting points 122 can be connected to each other using a floating crane 500 via steel wire ropes. Then, in a high tide environment and when the tide reaches a predetermined level, the superstructure 100 can be lifted using the floating crane 500. Specifically, the floating crane 500 includes a first hook 510 and a second hook 520, which are respectively located on either side of the superstructure 100. The first hook 510 is connected to its corresponding lifting point 122 on the turntable mechanism 120 via a first steel wire rope 511, and the second hook 520 is connected to its corresponding lifting point 122 on the turntable mechanism 120 via a second steel wire rope 521. In this way, while meeting the lifting height and rated load requirements, it is possible to avoid the need for an oversized floating crane 500 with a large lifting height, thereby reducing production costs.

[0084] Step S32: After the upper structure reaches the top of the door machine, guide the upper structure using guide pins to align the slewing bearing with the flange hole bolts of the door machine.

[0085] In this embodiment, after the floating crane 500 lifts the superstructure 100, it can be moved to the vicinity of the final assembly site to bring the cable and move the superstructure 100 above the gantry crane 200. Guide pins are then used to guide the superstructure 100 so that the slewing bearing is aligned with the flange bolt holes of the gantry crane 200. This effectively improves installation accuracy.

[0086] Step S33: Use the floating crane to control the upper structure to descend to the gantry crane, and connect the upper structure to the gantry crane.

[0087] Step S4: After the upper structure and the gantry crane are fastened together, the floating crane is disconnected from the upper structure.

[0088] In this embodiment, since the turntable mechanism 120 is provided with four lifting points 122, after the floating crane 500 installs the superstructure 100 on the gantry crane 200, if the conventional lifting scheme is followed, that is, the first hook 510 and the second hook 520 are still within the component range of the superstructure 100, the components of the superstructure will interfere with the first hook 510 and the second hook 520 and be damaged. Therefore, it is necessary to move the first hook 510 or the second hook 520 out of the component range of the superstructure 100 before the unhooking operation is performed. Specifically, Figure 11 As shown, step S4 may include the following steps:

[0089] Step S41: After the upper structure and the gantry crane are fastened together, the floating crane is controlled to lower the first hook to a first predetermined height so that the first steel wire rope is in a relaxed state. The first predetermined height is higher than the height of the A-frame assembly.

[0090] In this embodiment, the floating crane 500 can be first controlled to lower the first hook 510 to a first predetermined height so that the first steel wire rope 511 is in a relaxed state. At this time, the first hook 510 is at the first predetermined height and will not interfere with the various components of the upper structure 100. At the same time, the first steel wire rope 511 is in a relaxed state, which facilitates the subsequent displacement of the first hook 510.

[0091] Step S42: Disconnect the first steel wire rope from the corresponding lifting point, and use a traction device to pull the first steel wire rope to the outside of the superstructure.

[0092] In this embodiment, in order to prevent the first hook head 510 from being located within the component range of the superstructure 100 and interfering with the structural superstructure 100, a traction device, such as a guide rope or a winch, can be used to pull the first steel wire rope 511 in a relaxed state outward to the outside of the superstructure 100.

[0093] Step S43: Use the hull cable to adjust the angle of the boom of the floating crane so that the first hook moves to the outside of the superstructure.

[0094] In this embodiment, Figure 9 As shown, after the first steel wire rope 511 is pulled to the outside of the superstructure 100, to further ensure safety, the boom angle of the floating crane 500 can be fine-tuned by operating the cable between the floating crane 500 and the hull. Specifically, the deflection of the hull of the floating crane 500 can be controlled by retracting and releasing the hull cable, thereby driving the rotation angle of the boom of the floating crane 500. This causes the first hook 510, which is in an unloaded state, to swing outward along a predetermined trajectory, eventually moving to the outside of the superstructure 100 and out of the range of the superstructure 100 components. This prevents the first hook 510 or the first steel wire rope 511 from interfering with or colliding with the gantry crane 200 or the superstructure 100, and reserves space for the subsequent removal of the second hook 520.

[0095] Step S44: Control the floating crane to lower the first hook to the ground, and remove the first steel wire rope connected to the first hook.

[0096] In this embodiment, when the first hook 510 is lowered to the ground, the floating crane 500 controls the height of the second hook 520 to remain unchanged, thereby keeping the second hook 520 in a stable hovering state.

[0097] Step S45 , controlling the floating crane 500 to raise the first hook 510 to a second predetermined height, where the second predetermined height is higher than the height of the A-frame assembly 150 .

[0098] In this embodiment, Figure 12 As shown, by controlling the floating crane 500 to raise the first hook 510 to the second predetermined height, the first hook 510 can be prevented from interfering with the A-frame assembly 150 during subsequent movement.

[0099] Step S46: Use the hull cable to adjust the angle of the boom of the floating crane so that the second hook moves to just above the corresponding lifting point.

[0100] Step S47: Control the floating crane to lower the second hook to a first predetermined height so that the second steel wire rope is in a relaxed state, and remove the connection between the second steel wire rope and the corresponding lifting point.

[0101] As a result, both the first hook 510 and the second hook 520 have been disconnected from the upper structure 100 .

[0102] The final assembly method of the present invention may further include:

[0103] Step S5: controlling the hull angle of the vessel on which the floating crane is located so as to shift the entire boom of the floating crane to the outside of the superstructure.

[0104] In this embodiment, after the first hook 510 and the second hook 520 are disconnected from the superstructure 100, the hull angle of the ship on which the floating crane 500 is located can be controlled to shift the entire boom of the floating crane 500 to the outside of the superstructure 100, thereby completing the installation operation of the superstructure 100.

[0105] In summary, the method for assembling the upper structure 100 of a large gantry crane of the present invention realizes the low-altitude operation of high-altitude work, reduces construction risks, realizes the modular assembly of the upper components of the gantry crane 200, improves the integrity of the component assembly, and shortens the assembly cycle by assembling the slewing mechanism 110, turntable mechanism 120, luffing mechanism 130, lifting mechanism 140, herringbone assembly 150, machine room enclosure, and electrical components on the ground as the upper structure 100. At the same time, by setting up an assembly site at the dock and using a floating crane 500 to lift the upper structure 100 and hoist it onto the gantry crane 200 under high tide conditions, it is possible to meet the lifting height and rated lifting load while avoiding the need for an oversized floating crane 500 with a large lifting height, thereby reducing production costs.

[0106] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0107] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for assembling the upper structure of a large portal crane, characterized in that: The superstructure includes a slewing mechanism, a turntable mechanism, a luffing mechanism, a lifting mechanism, a herringbone assembly, a machine room enclosure, and electrical components. The assembly method includes: Step S1: setting up a sub-assembly site at the wharf, and setting up a sub-assembly tire stand on the sub-assembly site; Step S2: assembling the slewing mechanism, the turntable mechanism, the luffing mechanism, the lifting mechanism, the herringbone assembly, the machine room enclosure, and the electrical components on the assembly frame to form the superstructure; Step S3: Under high tide conditions, use a floating crane to lift the superstructure and install the superstructure on the gantry crane; Step S4: After the upper structure and the gantry crane are fastened together, the floating crane is disconnected from the upper structure.

2. The method for assembling the upper structure of a large portal crane according to claim 1, characterized in that: The step S1 comprises: Step S11: Casting a ground beam at the end of the gantry crane track close to the dock shore, laying a temporary track leading to the dock shore, and moving the gantry crane to a predetermined position via the temporary track; Step S12: After the gantry crane moves to the predetermined position, the area between the gantry crane and the dock is set as the assembly site; Step S13: setting up the tire assembly stand on the assembly site.

3. The method for assembling the upper structure of a large portal crane according to claim 1, characterized in that: The step S2 comprises: Step S21: Connect the slewing mechanism and the turntable mechanism at the assembly site, and hoist the slewing mechanism and the turntable mechanism onto the assembly tire stand; Step S22: Adjust the slewing bearing of the slewing mechanism and the turntable mechanism to be horizontal; Step S23: hoisting and installing the luffing mechanism and the lifting mechanism into a machine room on the carrying platform of the turntable mechanism; Step S24: hoisting the A-frame assembly onto the turntable mechanism and connecting it to the turntable mechanism; Step S25: Install the machine room enclosure to the periphery of the machine room, and install the electrical components into the machine room to complete the installation of the superstructure.

4. The method for assembling the upper structure of a large portal crane according to claim 3, characterized in that: The step S24 further includes: A counterweight is cast in the tail box of the turntable mechanism.

5. The large portal crane superstructure assembly method according to claim 3, characterized in that: The step S3 comprises: Step S31: hoisting the superstructure using the floating crane under high tide conditions; Step S32: After the upper structure reaches above the door machine, guide the upper structure using guide pins so that the slewing bearing is aligned with the flange hole bolts of the door machine; Step S33: Use the floating crane to control the upper structure to descend to the gantry crane, and connect the upper structure to the gantry crane.

6. The large portal crane superstructure assembly method according to claim 5, characterized in that: The step S31 includes: A plurality of lifting points are provided on the turntable mechanism, and the floating crane is used to connect the plurality of lifting points respectively via steel wire ropes; In a high tide environment and after the tide reaches a predetermined tide level, the upper structure is lifted using the floating crane.

7. The method for assembling the upper structure of a large portal crane according to claim 6, characterized in that: The floating crane includes a first hook head and a second hook head, and the first hook head and the second hook head are respectively located on both sides of the upper structure. The first hook head is connected to the corresponding lifting point on the turntable mechanism through a first steel wire rope, and the second hook head is connected to the corresponding lifting point on the turntable mechanism through a second steel wire rope.

8. The large portal crane superstructure assembly method according to claim 7, characterized in that: The step S4 comprises: Step S41: After the superstructure and the gantry crane are fastened together, controlling the floating crane to lower the first hook to a first predetermined height so that the first steel wire rope is in a relaxed state, wherein the first predetermined height is higher than the height of the A-frame assembly; Step S42: disconnecting the first steel wire rope from the corresponding lifting point, and using a traction device to pull the first steel wire rope to the outside of the superstructure; Step S43: using a ship's cable to adjust the angle of the boom of the floating crane so that the first hook moves to the outside of the superstructure; Step S44: controlling the floating crane to lower the first hook to the ground, and removing the first steel wire rope connected to the first hook; Step S45: controlling the floating crane to raise the first hook to a second predetermined height, where the second predetermined height is higher than the height of the A-frame assembly; Step S46: Using the hull cable to adjust the angle of the boom of the floating crane so that the second hook moves to just above the corresponding lifting point; Step S47: Control the floating crane to lower the second hook head to the first predetermined height so that the second steel wire rope is in a relaxed state, and remove the connection between the second steel wire rope and the corresponding lifting point.

9. The large portal crane superstructure assembly method according to claim 8, characterized in that: The step S44 further includes: During the process of the first hook head descending to the ground, the floating crane controls the height of the second hook head to remain unchanged.

10. The method for assembling the upper structure of a large portal crane according to claim 8, characterized in that: Also includes: Step S5: Control the vessel on which the floating crane is located to adjust the hull angle so that the floating crane boom is entirely shifted to the outside of the superstructure.

Images