Auxiliary crane and installation method of arm laying frame of auxiliary crane

Abstract

The invention relates to an auxiliary crane and a mounting method of an arm laying frame thereof, which comprises the following steps of: before a ship enters water, mounting a main body on a ship deck; a supporting tool is manufactured according to the theoretical height of an arm placing frame of the auxiliary crane; the supporting tool is installed to a designated position on a ship deck, and the arm placing frame is installed to the supporting tool; one end of the suspension arm is connected with the main body, and the other end of the suspension arm is folded and installed on the arm placing frame; and stringing, wiring and debugging of the auxiliary crane are completed. After the ship is launched, the arm placing frame is separated from the supporting tool; and after the arm placing frame is separated from the supporting tool, the arm placing frame is hoisted to the theoretical installation position of the ship broadside through the auxiliary crane. According to the installation method, construction operations such as fixing of the arm placing frame, installation of the suspension arm and threading of the steel wire rope can be completed before the ship is launched, and installation of the arm placing frame can be achieved through the hoisting capacity of the auxiliary crane after the ship is launched. Therefore, the overall installation procedure of the ship auxiliary crane is moved forward, the construction cost is greatly reduced, and the ship building period is shortened.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, and in particular to an auxiliary crane and its boom installation method. Background Technology

[0002] The jib arms of auxiliary cranes on offshore engineering vessels are typically mounted on the ship's side plating to save deck space and free up more cargo space. However, with the continuous increase in the power of offshore wind turbines, the size and weight of wind turbine installation vessels have also increased. The vessel's width is approaching the dry dock limit, making it impossible to complete the installation of the auxiliary crane's jib arms during the folding phase. Consequently, the crane boom itself cannot be installed (the jib arms must provide safety support for the already installed boom during jib retraction). Therefore, the boom and jib arms must be temporarily fixed to the deck or placed on the dock, and the lifting operation can only be carried out after the vessel is launched.

[0003] Existing crane installation technology still relies on floating cranes or dock cranes for dock construction work after ships are launched. After the crane is installed, it is necessary to thread steel wire ropes, connect and debug the wiring, and conduct load tests on the crane. This has the disadvantages of large workload, long construction period, high cost, and high safety risks. Summary of the Invention

[0004] One objective of this invention is to overcome the shortcomings of the prior art and provide a method for installing an auxiliary crane and its boom. To solve the above-mentioned technical problems, this invention adopts the following technical solution:

[0005] An auxiliary crane and its boom assembly installation method are disclosed, wherein the auxiliary crane includes a main body and a boom; the installation method includes the following steps: Before the ship is launched, the main body is installed onto the ship's deck; Before the ship is launched, support fixtures are made according to the theoretical height of the auxiliary crane's boom. Before the ship is launched, install the support fixtures to the designated positions on the ship's deck and install the support booms onto the support fixtures. Before the ship is launched, one end of the boom is connected to the main body, and the other end of the boom is folded up and installed on the boom frame. Before the ship is launched, complete the rope threading, wiring, and debugging of the auxiliary crane; After the ship is launched, the boom will be separated from the supporting fixtures; After the boom is separated from the supporting fixtures, the auxiliary crane is used to lift the boom to the theoretical installation position on the side of the ship.

[0006] In one embodiment, during the step of installing the support fixture to a designated position on the ship's deck, the designated position ensures that when the boom is installed on the support fixture, the distance from the boom's rotation center to the slewing center is consistent with the distance from the boom's rotation center to the slewing center when the boom is installed to the theoretical installation position.

[0007] In one embodiment, in the step of installing the support fixture to a designated position on the ship's deck, the designated position is close to the longitudinal centerline of the ship, and the angle at which the boom rotates from the designated position to the theoretical installation position is an acute angle.

[0008] In one embodiment, during the step of installing the support fixture to a designated location on the ship's deck and installing the boom onto the support fixture, the overall height of the boom and the support fixture can be consistent with the theoretical height when the boom is installed on the support fixture.

[0009] In one embodiment, the support fixture and the support arm are stacked in the height direction; The overall height error between the boom and the supporting fixture should be controlled within ±10mm.

[0010] In one embodiment, when the boom is mounted on the support fixture, the level deviation of the top of the boom is controlled within ±2mm.

[0011] In one embodiment, the support fixture is fabricated using an existing on-site structure; The support fixture includes a fixture body, a support section, and a support base. The support section is located on top of the fixture body, and the support base is located on top of the support section. The support arm is connected and fixed to the support base.

[0012] In one embodiment, after the step of retracting the other end of the boom onto the boom support, a limiting block is used to limit and fix the position of the boom on the boom support.

[0013] In one embodiment, during the step of installing the main body onto the ship's deck, the main body includes a fixed base, a slewing base, and an A-frame, which are installed sequentially from bottom to top.

[0014] In one embodiment, after the step of using an auxiliary crane to lift the support boom to the theoretical installation position on the side of the ship, the method further includes: Remove the supporting fixtures from the ship's deck.

[0015] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects: In this invention, the installation method of the auxiliary crane and its boom includes the following steps: Before the ship is launched, the main body is installed on the ship's deck; a support fixture is fabricated according to the theoretical height of the auxiliary crane's boom; the support fixture is installed at the designated position on the ship's deck, and the boom is installed onto the support fixture; one end of the boom is connected to the main body, and the other end of the boom is folded up and installed on the boom; the rope threading, wiring, and debugging of the auxiliary crane are completed. After the ship is launched, the boom is separated from the support fixture; after the boom is separated from the support fixture, the auxiliary crane is used to lift the boom to the theoretical installation position on the side of the ship.

[0016] This installation method allows for the completion of tasks such as securing the boom, installing the jib, and threading the wire ropes before the vessel is launched, thus enabling the auxiliary crane to lift. After launch, the auxiliary crane's own lifting capacity can be used for underwater positioning and installation of the boom. This method not only completes the jib installation during the vessel's closure phase but also avoids the cost of leasing a floating crane for boom lifting. It ensures the boom's stability and safety during launch while minimizing the cost of jib binding. This method advances the overall installation process of the vessel's auxiliary crane, significantly reducing construction costs and shortening the shipbuilding cycle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation process of auxiliary cranes and boom frames in related technologies.

[0018] Figure 2 This is a front view of the theoretical layout of the ship according to an embodiment of the present invention.

[0019] Figure 3 yes Figure 2 The diagram shows a top view of the ship's theoretical layout.

[0020] Figure 4 This is a flowchart of the installation method of the auxiliary crane and its boom frame according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the support fixture according to an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the boom retracted to a designated position according to an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the supporting fixture installed at a designated position according to an embodiment of the present invention.

[0024] Figure 8 This is a schematic diagram of the structure of the connection and fixation between the armrest and the support fixture in an embodiment of the present invention.

[0025] Figure 9This is a schematic diagram of the structure of the boom housed on the boom support frame and supporting fixture according to an embodiment of the present invention.

[0026] Figure 10 yes Figure 9 A side view of the structure shown.

[0027] Figure 11 This is a schematic diagram of the installation method according to an embodiment of the present invention.

[0028] The annotations in the attached figures are explained as follows: 10-Ship; 20-Main crane; 30-Auxiliary crane; 31-Main body; 311-Fixed base; 312-Slewing base; 313-A-frame; 32-Boom; 321-Hook; 40-Wing support frame; 50-Support fixture; 51- Fixture body; 52-Support section; 53-Support base; 60-Limit block. Detailed Implementation

[0029] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0030] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] Large cranes on offshore engineering vessels are equipped with dedicated boom supports. The core function of these boom supports is to safely and stably house and support the crane boom, ensuring it is in a protected, low-risk position that does not interfere with the main operations when not in use. Currently, wind turbine installation vessels both domestically and internationally are designed with both main and auxiliary cranes. Auxiliary cranes assist the main crane in performing horizontal lifting and tilting operations on offshore wind turbine equipment, with rated load capacities ranging from several hundred tons to over a thousand tons.

[0033] The boom of the auxiliary crane is often designed to be mounted on the outer plating of the ship's side to avoid occupying deck space, leaving more planar load-bearing area on the deck for transporting large wind turbine equipment. This also facilitates offshore wind turbine operations and improves work efficiency. As the power of offshore wind turbines continues to increase, the size of wind turbine installation vessels is also growing, with the width of the vessel reaching the limit for launching barges or some dry docks. Therefore, the auxiliary crane and its boom often cannot be installed at the assembly site. The boom and boom need to be temporarily placed on the dock or fixed to the deck and launched with the ship. After the ship is launched, a dock crane or floating crane is used for the underwater lifting of the auxiliary crane boom and boom. The operation process can be found by referring to [reference needed]. Figure 1 As shown.

[0034] like Figure 1 As shown, the complex tasks of underwater hoisting of the boom, installation of auxiliary cranes, wire rope threading and connection, and commissioning are all carried out after the ship is launched. This greatly increases the amount of underwater construction work, extends the project's construction period, and increases construction costs.

[0035] Based on this, the present invention provides an installation method for an auxiliary crane and its boom, which breaks through the traditional limitation that the boom and boom must be installed after the ship is launched. It enables the boom to be installed, wire rope threaded, and wiring and debugging to be completed during the ship's closure stage, and realizes the pre-positioning of some work procedures, thereby reducing the amount of underwater construction work, shortening the project construction period, and reducing construction costs.

[0036] The following will describe in detail, with reference to the accompanying drawings, specific embodiments of the auxiliary crane and its boom frame installation method (hereinafter referred to as the installation method) of the present invention.

[0037] It is worth noting that the installation method of this invention can be applied to offshore self-elevating wind turbine installation vessels. See also Figure 2 and Figure 3 As shown, the offshore self-elevating wind turbine installation vessel is equipped with one main crane 20 and one auxiliary crane 30. The auxiliary crane 30 is located on the starboard side of the deck near the bow amidships. To avoid interference with the main crane 20 and to provide a larger deck load-bearing area, the boom 32 of the auxiliary crane 30 is mounted on the outer side plating of the main crane 20's structural foundation.

[0038] refer to Figure 3In the following embodiments of this application, the auxiliary crane 30's boom 40 is arranged and installed on the outer side plate of the main crane 20's structural foundation (i.e., theoretical installation position B below) as an example. However, those skilled in the art will readily understand that when the theoretical installation position of the boom 40 changes, various modifications, additions, substitutions, deletions, or other changes can be made to the following specific embodiments, and these changes are still within the scope of the principles of the auxiliary crane and its boom installation method proposed in this invention.

[0039] Please refer to Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, the auxiliary crane 30 includes a main body 31 and a boom 32. The installation method includes the following steps: S10, before the vessel 10 is launched, install the main body 31 onto the deck of the vessel 10. For example, such as Figure 3 As shown, the main body 31 is installed on the starboard side of the deck near the bow amidships.

[0040] Among them, reference Figure 2 The main body 31 may include a fixed base 311, a rotating base 312, and an A-frame 313, which are installed sequentially from bottom to top. Specifically, during the ship 10 assembly phase, the fixed base 311 at the bottom of the auxiliary crane 30 is first hoisted onto the deck. Then, the rotating base 312 of the auxiliary crane 30 is hoisted and welded onto the fixed base 311. Finally, the A-frame 313 above the auxiliary crane 30 is hoisted and installed onto the rotating base 312. At this time, the wiring work for the control and communication cables in the control room on the main body 31 of the auxiliary crane 30 can be completed first.

[0041] like Figure 4 As shown, the installation method further includes S20: before the vessel 10 is launched, a support fixture 50 is fabricated based on the theoretical height of the boom 40 of the auxiliary crane 30. (Referring to...) Figure 2 The theoretical height H of the boom 40 refers to the height of the boom 40 when it is finally installed in the theoretical installation position B. This theoretical height H determines the theoretical retractable height of the boom 32 of the auxiliary crane 30. The theoretical height H of the boom 40 can be set according to the actual ship design and manufacturing, and this application does not make specific limitations on it.

[0042] In step S20, the height of the support fixture 50 can be determined based on the theoretical height H and the height of the support arm 40 itself, and then the support fixture 50 is manufactured based on the height of the support fixture 50.

[0043] refer to Figure 5In one embodiment, the support fixture 50 can be fabricated using existing on-site structures. The support fixture 50 includes a fixture body 51, a support section 52, and a support base 53. Optionally, the fixture body 51 can use existing on-site structures such as portal frames. The support section 52 can be made using existing on-site steel pipe structures. The support base 53 can be made using existing on-site steel plate structures.

[0044] like Figure 5 As shown, the support section 52 is located on the top of the tooling body 51. The two can be connected and fixed by welding.

[0045] like Figure 5 As shown, the support base 53 is located on top of the support section 52. The two can be connected and fixed by welding. Optionally, the support base 53 can be configured as a cross-shaped base structure to stably support and fix the support arm 40.

[0046] In this embodiment, after the tooling body 51, support section 52, and support base 53 are welded and assembled, they must meet the aforementioned height requirements of the support tooling 50 to ensure that the overall height of the support arm 40 and the support tooling 50 is consistent with the theoretical height H when the support arm 40 is installed on the support tooling 50. The tooling body 51, support section 52, and support base 53 can all be made of steel of Q235B grade or higher, and the load-bearing capacity of the support tooling 50 must be verified for strength and stability.

[0047] It should be noted that in the embodiments of this application, steps S10 and S20 do not have a strict order, and the two steps can be performed simultaneously.

[0048] like Figure 4 As shown, the installation method of the present invention further includes: S30, before the ship 10 is launched, installing the support fixture 50 to a designated position on the deck of the ship 10, and installing the support arm 40 onto the support fixture 50.

[0049] For example, refer to Figure 6 As shown, in step S30, the support fixture 50 will be installed at a designated location A on the deck of the ship 10. This designated location A must at least meet the following conditions: For example, this designated position A ensures that when the boom 40 is installed on the support fixture 50, the distance L1 from the boom 40 to the center of rotation of the boom 32 is consistent with the distance L2 from the boom 40 to the center of rotation of the boom 32 when the boom 40 is installed in the theoretical installation position B. That is, this designated position A must satisfy L1=L2 or L1 and L2 have only a small deviation. This helps ensure that the boom 32 of the auxiliary crane 30 can be reliably retracted and supported on the boom 40 both before and after the launch of the vessel 10.

[0050] refer to Figure 6 and Figure 7 For example, the designated position A can be arranged close to the longitudinal centerline of the vessel 10, allowing the boom 32 to rotate from designated position A to the theoretical installation position B at an acute angle C. This helps ensure that the boom 32 can be fully retracted on the deck before the vessel 10 is launched without interfering with the main crane 20 and other equipment, and that after the vessel 10 is launched, the boom 32 only needs to rotate a small angle to lift the jib 40 to the theoretical installation position B, thereby improving operational efficiency.

[0051] In this embodiment, after determining the installation position of the support fixture 50, that is, after positioning the support fixture 50 to the designated position A, the bottom of the support fixture 50 can be welded to the deck. After the weld inspection of the support fixture 50 is qualified, the support arm 40 is then installed.

[0052] It is worth noting that the welding of the support fixture 50 to the deck structure must take into full consideration the avoidance of important compartments such as fuel tanks and electrical control rooms, and low current welding should be used to avoid burning and repairing the paint inside the compartments.

[0053] refer to Figure 8 In step S30, the boom 40 is installed onto the support fixture 50. Specifically, the boom 40 can be hoisted onto the support fixture 50, and after verifying the positioning dimensions of the boom 40, the boom 40 and the support fixture 50 are welded together. Optionally, the boom 40 is welded to the support base 53.

[0054] In this embodiment, by connecting and fixing the boom 40 to the support fixture 50, the boom 40 can be secured to the deck of the ship 10, thus eliminating the need for additional lashing structures. Furthermore, the support fixture 50 allows the overall weight load of the boom 40, the subsequently installed boom 32, hook 321, wire ropes, and other accessories to be transferred to the deck, thereby optimizing load distribution and improving structural safety.

[0055] See Figure 8 For example, in step S30, after the boom 40 and the support fixture 50 are positioned and installed, the overall height h1 of the boom 40 and the support fixture 50 should be consistent with the theoretical height H. That is, the overall height of the boom 40 and the support fixture 50 should satisfy h1=H or h1 and H have only a small deviation.

[0056] like Figure 8As shown, optionally, the support fixture 50 and the boom 40 are stacked in the height direction, controlling the overall height error between the boom 40 and the support fixture 50 within ±10mm. That is, the deviation between h1 and H does not exceed 10mm. This helps ensure that the height of the boom 32 stored on the boom 40 at the designated position A is consistent with its height stored on the boom 40 at the theoretical installation position B (i.e., the theoretical storage height of the boom 32), thus ensuring reliable storage and support of the boom 32. Even if there is a deviation, the height error is controlled within ±10mm and will not affect the reliable storage of the boom 32.

[0057] refer to Figure 8 In one embodiment, when the boom 40 is mounted on the support fixture 50, the levelness deviation of the top of the boom 40 is controlled within ±2mm. This helps to improve the reliability of subsequent boom 32 retraction.

[0058] like Figure 4 As shown, the installation method of the present invention further includes: S40, before the ship 10 is launched, connecting one end of the boom 32 to the main body 31, and retracting the other end of the boom 32 onto the support frame 40.

[0059] For example, refer to Figure 9 After the supporting fixture 50 and the boom 40 have passed all sealing and welding inspections, the hook 321 of the boom 32 can be hoisted into the hook groove of the boom 40. (For reference only.) Figure 6 Then, the boom 32 of the auxiliary crane 30 is hoisted, one end of the boom 32 is connected to the slewing base 312, and the other end of the boom 32 is folded up and installed on the support frame 40. Thus, through the specially designed support fixture 50 and the support frame 40 fixed on the support fixture 50, the installation of the boom 32 of the auxiliary crane 30 can be completed on land.

[0060] like Figure 4 As shown, in this invention, after step S40, the method further includes: S50, before the ship 10 is launched, completing the rope threading, wiring and debugging of the auxiliary crane 30.

[0061] In this application, all steps S10 to S50 are completed before the vessel 10 is launched. For example, all steps S10 to S50 can be completed during the vessel 10's closure phase. This achieves the completion of all installation, wiring, and commissioning work for the auxiliary crane 30 on land. Compared to traditional methods where boom installation, wire rope threading, and commissioning are performed after the vessel 10 is launched, the installation method of this application allows the entire auxiliary crane 30 installation, including boom 32 installation, wire rope threading, and commissioning, to be completed before the vessel 10's closure phase. This shifts most of the procedures forward, significantly reducing construction costs and shortening the overall construction period.

[0062] It is understandable that after the ship 10 is assembled and goes through a series of key procedures, the ship 10 can be launched.

[0063] refer to Figure 10 After step S40 and before launching the vessel 10, the position of the boom 32 on the boom frame 40 can be limited and fixed using the limiting block 60. The limiting block 60 can be a wooden wedge structure. This operation ensures that the boom 32 is reliably and stably stored and fixed on the boom frame 40, and helps guarantee the safety of the boom 32 during the launching process of the vessel 10 and its functional integrity after launching.

[0064] See Figure 4 As shown, in this invention, the installation method further includes: S60, after the vessel 10 is launched, separating the boom 40 from the support fixture 50. Specifically, after the vessel 10 is launched, a lifting lock can be pre-attached to the boom 40, and the lifting lock can be connected to the hook 321 of the auxiliary crane 30. The adjusted auxiliary crane 30 can then be used to slightly tighten the lifting wire rope. Then, the support base 53 on the support fixture 50 can be cut to separate the boom 40 from the support fixture 50.

[0065] The installation method further includes: S70, after the boom 40 is separated from the support fixture 50, the auxiliary crane 30 is used to lift the boom 40 to the theoretical installation position on the side of the ship 10.

[0066] In step S70, after the boom 40 is separated from the supporting fixture 50, the auxiliary crane 30 itself can be used to hoist the boom 40 to the theoretical installation position B on the outer side plate of the main crane 20 structural foundation, and then the boom 40 and the outer side plate are reinforced and welded. This completes the installation of the boom 40 of the auxiliary crane 30.

[0067] See Figure 4 In one embodiment, after the step of using the auxiliary crane 30 to lift the boom 40 to the theoretical installation position on the side of the ship 10, the method further includes: S80, Remove the support fixture 50 on deck 10 of the vessel. The support fixture 50 can be removed by cutting. When cutting and removing the support fixture 50, care must be taken to control the temperature of the cutting flame and the cutting angle to avoid burning the deck and damaging the paint inside the hold.

[0068] See Figure 11The installation method of the auxiliary crane and its boom frame in this application embodiment has the following general workflow: On land, the supporting fixture 50 and the boom frame 40 are welded onto the deck → the auxiliary crane 30 boom 32 is hoisted on land and wire ropes are threaded through it → the ship 10 is launched → the boom frame 40 is separated from the supporting fixture 50 → the auxiliary crane 30 is used to formally hoist the boom frame 40 → the deck supporting fixture 50 is removed. This installation method transfers the work after the ship 10 is launched to the land assembly stage, reducing the workload after the ship 10 is launched by more than 70%. Using the debugged auxiliary crane 30 to install the boom frame 40 eliminates the need for external hoisting equipment, saving the cost of renting a floating crane after the ship 10 is launched, saving approximately RMB 1 million in auxiliary crane rental costs per ship. The reuse rate of the boom frame 40 fixing fixture (i.e., the supporting fixture 50) exceeds 80%, significantly reducing construction complexity. After the vessel was launched, the construction phase reduced the overall installation cycle from the traditional 30 days to within 15 days, improving installation efficiency by at least 50%.

[0069] The auxiliary crane and its boom installation method according to this application embodiment can complete the boom fixing, boom installation, and wire rope threading before the ship is launched, enabling the auxiliary crane to have lifting capabilities. Furthermore, after the ship is launched, the auxiliary crane's own lifting capacity can be used to perform underwater positioning and installation of the boom. This installation method not only completes the boom installation during the ship's closure phase but also avoids the cost of leasing a floating crane for boom lifting operations; it ensures the stability and safety of the boom during launching while minimizing the cost of boom lashing. This installation method advances the overall installation process of the ship's auxiliary crane, significantly reducing construction costs and shortening the shipbuilding cycle.

[0070] The above embodiments are merely illustrative examples of structures. The structures in each embodiment are not fixed combinations. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used.

[0071] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An auxiliary crane and its boom installation method, wherein the auxiliary crane comprises a main body and a boom; characterized in that, The installation method includes the following steps: Before the ship is launched, the main body is installed onto the ship's deck; Before the ship is launched, support fixtures are made according to the theoretical height of the auxiliary crane's boom. Before the ship is launched, the support fixture is installed at the designated position on the ship's deck, and the support arm is installed onto the support fixture. Before the ship is launched, one end of the boom is connected to the main body, and the other end of the boom is folded up and installed on the support frame. Before the ship is launched, the rope threading, wiring, and debugging of the auxiliary crane shall be completed; After the ship is launched, the boom frame will be separated from the supporting fixture. After the boom is separated from the supporting fixture, the auxiliary crane is used to lift the boom to the theoretical installation position on the side of the ship.

2. The installation method of the auxiliary crane and its boom frame according to claim 1, characterized in that, In the step of installing the support fixture to a designated position on the ship deck, the designated position ensures that when the boom is installed on the support fixture, the distance from the boom to the slewing center of the boom is consistent with the distance from the boom to the slewing center of the boom when the boom is installed to the theoretical installation position.

3. The installation method of the auxiliary crane and its boom frame according to claim 1, characterized in that, In the step of installing the support fixture to a designated position on the ship's deck, the designated position is close to the longitudinal centerline of the ship, and the angle at which the boom rotates from the designated position to the theoretical installation position is an acute angle.

4. The installation method of the auxiliary crane and its boom frame according to claim 1, characterized in that, In the step of installing the support fixture to a designated position on the ship's deck and installing the boom onto the support fixture, the overall height of the boom and the support fixture is consistent with the theoretical height when the boom is installed on the support fixture.

5. The installation method of the auxiliary crane and its boom frame according to claim 4, characterized in that, The supporting fixture and the support arm are stacked in the height direction; The overall height error between the support arm and the supporting fixture is controlled within ±10mm.

6. The installation method of the auxiliary crane and its boom frame according to claim 1, characterized in that, When the boom is installed on the support fixture, the horizontal deviation of the top of the boom is controlled within ±2mm.

7. The installation method of the auxiliary crane and its boom frame according to claim 1, characterized in that, The supporting fixtures are fabricated using existing on-site structures. The support fixture includes a fixture body, a support section, and a support base. The support section is located on top of the fixture body, and the support base is located on top of the support section. The support arm is connected and fixed to the support base.

8. The installation method of the auxiliary crane and its boom frame according to claim 1, characterized in that, After the step of folding the other end of the boom onto the boom support frame, the position of the boom on the boom support frame is limited and fixed by a limiting block.

9. The installation method of the auxiliary crane and its boom frame according to claim 1, characterized in that, In the step of installing the main body onto the ship's deck, the main body includes a fixed base, a slewing base, and an A-frame, which are installed sequentially from bottom to top.

10. The installation method of the auxiliary crane and its boom frame according to claim 1, characterized in that, After the step of using the auxiliary crane to lift the jib frame to its theoretical installation position on the side of the ship, the method further includes: Remove the aforementioned support fixtures from the ship's deck.

Images