KR101115168B1 - Method for managing floating cranes - Google Patents

Abstract

The present invention provides various techniques and environments for work such as lifting and towing by subdividing and setting factors for various issues to be considered in connecting and operating a plurality of marine cranes in parallel and applying them in actual operation. In overcoming the limitations of enemy constraints and operating a large number of offshore cranes, the process of handling the lifting, moving, loading, and use of all equipment in connection with lifting cranes is processed to process the lifting objects using offshore cranes. The aim is to make it easier to verify the lifting capacity.

The present invention for achieving the above object, the first step (S10) for selecting the lifting object 10, and estimating the weight of the selected lifting object 10, and selected in the first step (S10) Selection of the marine crane 12 corresponding to the weight of the lifting object 10 and the lifting object 10 selected through the second step (S12), the first step (S10) to select the lifting and mounting method accordingly The third step (S14) of calculating the lifting factor in accordance with the estimated weight and the lifting and mounting method selected through the second step (S12), of the marine crane 12 selected in the second step (S12) The lifting object 10 estimated in the fourth step (S16) and the first step (S10) of determining a weight suitable for actual lifting and loading by dividing the lifting factor calculated in the third step (S14) from the load that can be lifted. And the weight suitable for the actual lifting and loading of the marine crane 12 calculated in the fourth step (S16) In comparison, a fifth step (S18) of verifying an error of the selection of the lifting object 10 made in the first step (S10) or an error of the selection of the marine crane (12) made in the second step (S12). ), It is determined that there is no error in the selection of the lifting object 10 made in the first step S10 or the selection of the marine crane 12 made in the second step S12 in the fifth step S18. The sixth step (S20) of performing a simulation over the entire process from the lifting and mounting of the lifting object 10 by using the marine crane 12 selected in the second step (S12), and the sixth If there is no abnormality in step S20, using the marine crane 12 selected in the second step S12, the seventh step of actually carrying out the entire process of lifting and loading the lifting object 10 is carried out. It includes.

Nautical Cranes, Blocks, Salvage, Mounted, Synchronized, Factor

Description

Method for managing floating cranes

The present invention relates to a method of operating a marine crane, and more particularly, in the construction of ships and offshore structures, such as to maximize the rotation rate of the dock through the production of super-large block, using a plurality of parallel marine cranes connected in parallel Overseas cranes overcome the limitations of the construction process and determine the offshore crane to be used according to the weight of the super-large block, and process the overall work process for connection, mobile mounting and use of various equipment when operating multiple offshore cranes. It is about an operation method.

Recently, large ships are being manufactured in shipyards to improve the productivity of ships and offshore structures. As a result, marine cranes are used for the transportation of large blocks. In particular, in the case of very large blocks, it is impossible to use one marine crane. Therefore, more than two marine cranes are connected and operated in parallel. There is a trend.

However, when two or more marine cranes are connected and operated in parallel, the factor is calculated and applied in a similar way to the operation with one marine crane without special consideration of the load factor. Not only that, there has been a problem of greatly reducing the efficiency of the operation of the marine crane when the excessive load factor is applied for safety.

In particular, when two or more offshore cranes are simply connected by fenders and ropes, the lifting objects are moved from the lifted state to the sea.Therefore, there are many uncertainties due to environmental changes such as weather conditions and working conditions. The current situation is to lift and transport only large blocks of significantly lower weight than the lifting capacity. In addition, there has been a limitation in the lifting capacity of the block because only the empirical method can cope with changes in various maritime and working environments.

Accordingly, the present invention provides various techniques for lifting and towing by dividing and setting factors for various issues to be considered in connecting and operating a plurality of marine cranes in parallel and applying them in actual operation. Lifting targets using offshore lanes by overcoming the limitations of environmental constraints and processing the entire process of connecting, lifting, loading, and using all equipment in operating multiple offshore cranes. The purpose of this study is to make it easier to verify the lifting capacity of the ship, and to increase the turnover rate of the dock by maximizing the shipbuilding capacity and the construction capacity of the shipyard. There is this.

The present invention for achieving the above object, in the construction of ships and offshore structures through the assembly of a super-large block, selecting a lifting object for lifting and mounting, the first to estimate the weight of the selected lifting object And a second step of selecting a marine crane corresponding to the weight of the lifting object selected in the first step, a lifting and mounting method according thereto, and an estimated weight of the lifting object selected through the first step. A third step of calculating a lifting factor according to the lifting and loading method selected through the second step, and the lifting factor calculated in the third step by dividing the lifting factor calculated in the third step from the liftable load of the marine crane selected in the second step And a fourth step of determining a weight suitable for mounting, the weight of the lifting object estimated in the first step and the seal of the marine crane calculated in the fourth step. A fifth step of verifying an error in the selection of the lifting object made in the first step or an error in the selection of the offshore crane made in the second step by comparing the weight suitable for lifting and loading in the first step; If it is determined that there is no error in the selection of the lifting object made in the first step or the selection of the offshore crane made in the second step, the overall up to the lifting and loading of the lifting object by using the marine crane selected in the second step A sixth step of performing a simulation over the process; and a seventh step of actually carrying out the entire process of lifting and loading the lifting object using the marine crane selected in the second step if there is no abnormality in the sixth step. It presents a method of operation of a marine crane comprising a.

In the present invention, the second step is a step 2-1 of determining the number of offshore cranes as a single or a plurality, and the second-2 when determining the direct or indirect connection method when operating the plurality of offshore cranes And a second to third steps for determining the type of movement for lifting the object to be short or long distance, wherein the values of the lifting factors calculated according to the determination of each step are set differently. In the case of determining a plurality of offshore cranes in step 2-1, a plurality of offshore cranes are operated in synchronization.

In the present invention, the lifting factor calculated in the third step is a weight factor that is applied by dividing the weight of the lifting object by the estimated weight or the actual weighing weight, and each hook according to the position of the center of gravity when lifting the lifting object Center of gravity factor that reflects error due to load change on the load, inclination factor that reflects the risk factor due to the bias of the load on a specific hook due to the speed difference of each hook when lifting the lifting object, the work area when lifting the lifting object Dynamic load factor considering the abnormal behavior of marine cranes due to environmental factors, multiple crane factor considering the behavior change of marine cranes according to the way of interconnecting multiple marine cranes, Operation factor considering accuracy and angle of horizontal motion caused by digging in many offshore cranes It characterized in that it includes at least one or more of the factors to consider the connection strength according to the position change of the size.

In the present invention, when the error of the selection of the lifting object or the error of the selection of the offshore crane in the fifth step is repeated, the following steps are repeated from the first step, using the offshore crane in the sixth step In the simulation of the overall process leading to the lifting and loading of the lifting object, the following steps may be repeated from the first step when determining an error.

According to the operation method of the marine crane according to the present invention, in the operation of a plurality of offshore cranes for the movement and loading of blocks during the construction process of ships and offshore structures, the lifting and mounting of larger blocks by applying a synchronization system It will be possible. As a result, the present invention can achieve the production of extra-large blocks in the construction of ships and offshore structures, thereby improving the turnover of the dock, and thus the process and time required for the construction of ships and offshore structures. It will be possible to maximize the shipbuilding capacity of the shipyard.

In addition, the present invention calculates a lifting factor for various variables according to the selection and lifting and mounting method of the offshore crane and the lifting object in the operation of connecting a plurality of offshore cranes in parallel, and lifting them using the actual offshore crane By efficiently applying to the lifting and mounting of the object, it is possible to overcome the limitations caused by the constraints of technology and environment encountered in the entire process of lifting, transporting and loading the super-large block.

In addition, the present invention is a dynamic and fluid dynamics of the overall operation process for the connection between the marine cranes and the lifting and moving, mounting, use of all equipment of the lifting object using the same in synchronizing the operation of multiple marine cranes By applying the considered simulation program, the process can be processed to build optimal lifting conditions and additional structures by schedule, so that errors in all processes can be more easily verified before actual work of lifting objects using marine cranes. In addition to enabling an effective response, it is possible to expect productivity improvement by reducing work waiting time.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying exemplary drawings. The present invention maximizes the dock turnover through the manufacture of super-large blocks in the construction of ships and offshore structures, and puts them to practical use beyond the limitations of the existing method of operating marine cranes. By applying a synchronization system that can be electrically connected, the entire process from lifting to mounting of a very large structure having a complex shape is processed, thereby improving the efficiency of drying.

The present invention for this purpose, as shown in Figures 1 and 2, in the construction of ships and offshore structures through the assembly of super-large block, the lifting object 10 for lifting and mounting is selected, and the selected lifting object ( The first step (S10) for estimating the weight of 10), the selection of the offshore crane 12 corresponding to the weight of the lifting object 10 selected in the first step (S10) and the lifting and mounting method accordingly Optimum considering the estimated weight, environmental factors and working conditions for the lifting object 10 selected through the second step (S12), the first step (S10) and the second step (S12) to be selected The third step (S14) of estimating and calculating the lifting factor of the step (S14), the third step (from the estimated lifting load corresponding to the lifting capacity of the marine crane 12 selected in the second step (S12) The lifting factor calculated in S14) is divided and applied to actual lifting and mounting. The fourth step (S16) to calculate and determine the weight, the weight of the lifting object 10 estimated in the first step (S10) and the actual lifting of the offshore crane 12 calculated in the fourth step (S16) And comparing the weight suitable for mounting and verifying an error on the selection of the lifting object 10 made in the first step S10 or an error on the selection of the offshore crane 12 made in the second step S12. For the selection of the lifting object 10 made in the first step S10 in the fifth step S18, the fifth step S18 or the selection of the marine crane 12 made in the second step S12 If it is determined that there is no error, the sixth of performing a simulation in a virtual space over the entire process from the lifting and mounting of the lifting object 10 by using the marine crane 12 selected in the second step (S12) If there is no abnormality in step S20 and the sixth step S20, the second stage It is configured to include a floating crane of claim 7 step (S22) of actually implementing embodiments the whole process leading to the lifting and the mounting of the lift object 10 by using the 12 selection (S12).

The process of estimating the weight of the lifting object 10 using the offshore crane 12 in the first step (S10) is selected for lifting and mounting during the construction of ships and offshore structures through the assembly of extra-large blocks. By estimating the weight of the lifting object 10, it is usually a kind of estimated value determined by calculation by design equipment in consideration of specific weight and the like of the design specification and material.

The process of selecting the lifting crane 12 and the lifting and mounting method in the second step (S12) is to determine the appropriate lifting capacity in consideration of the weight of the lifting target 10 estimated in the first step (S10). Eggplant means the determination of the overall lifting and mounting method for operating in parallel a plurality of offshore crane (12). In this process, it is reasonable to operate a single offshore crane 12 if the estimated weight of the lifting object 10 is sufficient for the lifting capacity of a single offshore crane 12, but the present invention provides a single offshore crane 12 ) Is an overall operation method of lifting and mounting by connecting a plurality of offshore cranes 12 in parallel for a super-large block exceeding the lifting capacity, the embodiment of operating a single offshore crane 12 will be omitted. Shall be.

The second step (S12) is a second step (S12-1) for determining whether the quantity of the operating equipment for the offshore crane 12 to a single quantity or a plurality of quantities and the offshore crane Step 2-2 (S12-2) for deciding whether to connect the connection method to the direct connection method or the indirect connection method in the case of operating a plurality of quantities, and the marine crane 12 In the transfer of the lifting object 10 by using the divided into the second or third step (S12-3) to determine whether the form of movement to be near or far. In this case, the values of the lifting factors calculated according to the determination of each of the steps S12-1, S12-2, and S12-3 are set differently, which is determined in the next third step S14. Is done. In particular, when determining a plurality of offshore cranes 12 in the second step (S12-1) to operate by applying a synchronization system for electrically connecting a plurality of offshore cranes (12) different from the master offshore crane It is desirable to simultaneously control the operation of the remaining slave offshore cranes.

The third step (S14) is to apply the lifting and mounting estimated through the second step (S12) to the lifting object 10 selected through the first step (S10), a plurality of offshore crane ( 12) In lifting and transporting the lifting object 10 using the above-described method, in order to prepare various kinds of lifting factors to be applied in order to maximize the operational efficiency of the offshore crane 12 and to apply them in accordance with the standards. It is a process. For example, the lifting factor to consider in operating the offshore crane 12 according to the present invention may be the following seven issues.

(1) Weight Accuracy Factor

The weight factor means that the weight of the lifting object 10 made in the first step S10 is divided into an estimated weight or an actual weighed weight. At this time, when applying the weight for the lifting object 10 as the weighing weight, the weight factor is calculated as 1.035. The weighing weight is based on the weight control report or the actual weighing result, which has already been gained experience or track record. It is obtained by.

In addition, when the weight of the lifting object 10 is applied as the estimated weight, the weight factor is calculated as 1.05. The estimated weight is estimated by general weight control or drawings because there is no previous salvage or experience. It is obtained by the method and applied based on the existing prediction accuracy. For example, if the design is made by a design tool such as Tribon, it corresponds to the weight that can be obtained by calculation in consideration of the shape size, specific weight, and other auxiliary elements according to the material.

In addition, when applying the weight for the lifting object 10 as an estimated weight or a weighing weight, the relevant regulations (section 5.1 of Report No. 0027 / NDI; Noble Denton-Guidelines for Lifting Operations By Floating Crane Vessels and DNV-Rules for Marine) Decisions are made in consideration of the situation of shipyards where actual lifting and loading takes place.

(2) Center of Gravity Factor (COG)

When the lifting object 10 selected in the first step (S10) is changed depending on the position of the center of gravity when the lifting object 10 is actually lifted, the loads on the hooks are changed. The center of gravity factor is set to reflect this error. For example, FIG. 3 illustrates how loads applied to the hooks # 1, # 2, # 3, and # 4 change when the predicted center of gravity and the actual center of gravity are different. In addition, the center of gravity factor is set to 1.03 with reference to the existing error rate and related regulations (Section 5.9.1 of NDI).

On the other hand, the calculation of the load results when it is estimated that the position error of the center of gravity is about 1% for the verification of the center of gravity factor is as shown in FIG. That is, as a result of simulating the change of load distribution when the center of gravity deviated 1% from the actual center, the factor value of about 1.02034 was calculated. Accordingly, it can be seen that setting the center of gravity factor to 1.03 is appropriate.

(3) Tilt Factor

The inclination factor is accompanied by the load being biased to any particular hook when the lifting object 10 is inclinedly lifted by the speed difference of each hook when the lifting object 10 is actually selected for the lifting object 10 selected in the first step S10. The application is made in consideration of the risk factors.

In each hook for the lifting object 10 selected in the first step (S10), the lifting object 10 may be inclined to be lifted inclined due to a speed difference, etc., and the inclination factor is thus a specific hook when lifting. This is to take into account the risk factors associated with the load bias. In the present invention, the inclination factor is set to 1.03 with reference to the accuracy of the work and related regulations (Section 5.9.1 of the NDI).

On the other hand, when the factor is calculated on the basis of when the lifting object 10 is inclined about 1 degree for verification of the inclination factor, it is calculated differently depending on the shape of the lifting object 10. It is calculated as 1.004. If it is a wide plate, it is calculated as 1.035. In the case of a box shape that is most similar to the lifting object 10 in the form of a block, it is calculated as 1.026. All values are less than or similar to 1.03. Able to know. 5 shows the results of simulating the slope factor.

(4) Dynamic Amplification Factor

When the lifting object 10 is lifted using the offshore crane 12, abnormal behavior is involved in the lifting object 10 due to environmental factors such as waves generated in the work area, and the dynamic load factor considers such an abnormal behavior. It is calculated by. In the present invention, the dynamic load factor is referred to the relevant regulations (Section 5.2.1 of NDI) and the factor values shown in Table 1 below are applied in consideration of the situation of the shipyard where actual lifting and loading takes place.

That is, if there is no calculation performed specifically for the sea works using the offshore crane 12, to apply the subdivided factor value in Table 1 below, the work area is lifted and mounted is divided into the offshore and the sea, each In this case, the factor values are divided and applied according to the weight of the lifting object 10. At this time, the reason why the factor value of the offshore is larger than that of the offshore is higher than the offshore. This is because the work environment is poor. In addition, when the weight is lighter based on the weight of the lifting object 10, the factor value is set larger than when it is heavy, which means that the heavier the weight of the lifting object 10 is, the more relative to the work environment such as wind speed and digging. Because it is less affected.

[Table 1]

(5) Multi Crane Factor

When the lifting object 10 is lifted using two or more marine cranes 12 via wires 16 installed on the boom 14 of each marine crane 12, the marine cranes 12 are interconnected. At this time, there are two methods of firmly fixing the connection between the offshore crane 12 and to be able to freely move with a certain margin. Since the behavior of the marine crane 12 varies depending on how the marine crane 12 is connected, the matters to be considered are also dependently changed and set in consideration of each case is a multiple crane factor.

5-1) Rigid Body Connection

When the plurality of offshore cranes 12 are interconnected, the offshore crane 12 moves like a floating body in such a way as to firmly secure the connection between the offshore cranes 12. In this case, the load on the connecting part becomes large in the sea work, but since the influence of the sea condition on each hook is small, the factor value does not need to be considered separately. 6 shows an example in which a plurality of offshore cranes 12 are fixed by a rigid connection.

5-2) Flexible Connection

As shown in FIG. 7, a plurality of offshore cranes 12 are connected to each other with a certain margin without being firmly fixed to each other. Since the loads applied to the joints between the offshore cranes 12 are mostly absorbed according to the elongation of the connecting member, they do not need to be considered relatively large.However, the loads on the hooks vary depending on the offshore conditions. However, work should be done under limited sea conditions.

For example, when lifting two or more offshore cranes 12, one offshore crane 12 may be in wave breaking and the other offshore. In this case, a load imbalance occurs due to the height difference of the offshore crane 12. In order to consider this effect, multiple crane factors are applied. For the multiple crane factor, refer to the relevant regulations (Section 5.2.5 of NDI) for flexible connection, and apply factor value of 1.05 considering the situation of shipyard where actual lifting and loading takes place.

(6) Operation Factor

Although the behavior of the marine crane 12 may vary depending on the towing method, the marine crane 12 may be compared to the pulling force of the winch or the tug bollard pull. Due to the large weight, the burden on the offshore crane 12 due to sudden acceleration or stop is small, but considering the generation of waves by the propeller (Thruster) of the tug boat, the operation factor is applied to the following values.

The calculated value for the operating factor is applied based on the simulated value of the simulation of the dynamic behavior of the heavy load when lifting the marine crane 12 in parallel based on the practical experience. That is, the operation factor is to apply differently to the value according to the degree of the transfer speed when moving the marine crane 12 using the tug boat in the state in which the marine crane 12 lifted the lifting object 10.

First, when towing the offshore crane 12 using a general winch on the quay wall, the factor value was not applied, and when towing the offshore crane 12 using the tug boat, the towing speeds described in Table 2 below. Apply operating factor values.

TABLE 2

(7) Connection Factor or Yaw Factor

The connection factor is a factor in consideration of the force generated by the change of each hook position when the offshore cranes 12 connected in parallel are horizontally moved by digging. This is considered because it affects the yaw direction factor (horizontal displacement) of the lifting object 10 to be lifted and transported. These yaw factors may be reflected only in the rigging subdesign, but are included to reduce the un-known factor for unknown elements.

In other words, when performing the operation of lifting and mounting the lifting object 10 by interconnecting the plurality of offshore crane 12 with the floating structure 18, as shown in FIG. It can move on a horizontal plane in the other direction, which results in a sling angle as shown in FIG. 9, which results in an increase in the load of each hook. As such, the connection factor is to consider the increase in load generated from the change of position of each hook when the parallelly connected marine crane 12 performs horizontal movement.

That is, the connection factor is determined according to the horizontal displacement of the offshore crane 12. As the quantity of the floating structure 18 or the connection portion increases, the horizontal displacement and the sling angle increase, so the quantity of the flexible connection portion affects the connection factor. To give. 10 shows a situation where the number of connecting parts is one, and FIG. 11 shows a case where the number of connecting parts is four. When each connection part is connected in the same manner, four horizontal connections may be more generated than one connection part.

For example, as shown in FIGS. 10 and 11, when the number of floating structures 18 or connecting portions that connect between offshore cranes 12 increases, the horizontal displacement and sling angle become large, so that the number of flexible connecting portions needs to be increased. This affects the horizontal displacement, which is the (Yaw) direction factor. In general, it is known that the width difference with respect to the wire 16 of each offshore crane 12 has a smaller influence on the lifting load than the height difference of the boom 14. That is, in FIGS. 10 and 11, "1c" <"2c", "1d"> "2d", and the height difference of the boom 14 may be regarded as a factor for the behavior of a crane such as a DAF and a multi- crane factor. . At this time, the width difference corresponds to the distance difference between the two offshore crane 12, the product of the quantity of the distance between the offshore crane 12 divided by two, the height difference is the height of the boom and the boom and the lifting object Corresponds to the tangent of the angle of inclination between ["1c" or "2c" = ("e" xn) / 2, "1d" or "2d" = 22m x tan B]

On the other hand, when the sling angle exceeds 4 degrees, the connection factor is applied to the lifting capacity of the offshore crane 12 and the strength of the lifting object 10 after checking the load and the appropriate factor value, such as lugs, sacks and sling angles. Rigging reflected in the bottom design.

In addition, when the sling angle is not more than 4 degrees, the connection factor is a factor of 1.000 if the number of joints is 1, and a factor of 1.025 if the number of joints is 2, If the number of sites is 3, the factor value is 1.050. If the number of sites is 4 or more, additional consideration is given.

The fourth step S16 is actually lifted and mounted by dividing the various lifting factor values calculated in the third step S14 based on the liftable load of the marine crane 12 selected in the second step S12. It is a process of calculating and determining a weight suitable for the bar, in this process, multiplying the various lifting factor values calculated in the third step (S14), and then the marine crane 12 selected in the second step (S12) By dividing with respect to the load value that can be lifted, the weight value suitable for actual lifting and loading is calculated.

The fifth step S18 compares the weight of the lifting object 10 estimated in the first step S10 with the weight suitable for the actual lifting of the offshore crane 12 calculated in the fourth step S16. This is a process of verifying an error in selecting a lifting object 10 made in the first step S10 or an error in selecting a marine crane 12 made in the second step S12.

The weight of the lifting object 10 selected in the first step S10 is excessively small or the lifting capacity of the marine crane 12 selected in the second step S12 is excessively large compared to the weight calculated in this process. If large, the selection of the lifting object 10 made in the first step S10 is reselected as a larger weight, or the selection of the offshore crane 12 made in the second step S12 has a smaller lifting capacity. It is preferable to re-select the equipment so that the weight of the lifting object 10 to be lifted and mounted is close to the lifting capacity of the actual offshore crane 12.

That is, the fifth step (S18) selects the weight of the lifting object 10 within the range not exceeding the lifting capacity of the offshore crane 12, or close to exceed the weight of the lifting object 10 Means the process of selecting the offshore crane 12 having a lifting capacity to.

For example, when two offshore cranes 12 having a lifting capacity of 3600 tons are connected in parallel, the lifting capacity will be up to 7200 tons, and if the various lifting factor values calculated are 1.272, then lifting by using the offshore crane 12 Possible weight of the lifting object 10 will fall in the range of 5660-7200 tons.

At this time, the optimum limit weight for securing stability in lifting and mounting of the lifting object 10 will be 5660 tons, so if the lifting object 10 is selected that does not exceed this value, To ensure the safety of the.

If the lifting object 10 having a smaller weight is selected, the lifting object 10 is lifted and mounted using the offshore crane 12 by reselecting the lifting object 10 closer to the limit weight by reselecting the lifting object 10. It will be possible to maximize the efficiency of.

On the contrary, if the lifting capacity of the offshore crane 12 is excessively large compared to the weight of the lifting object 10, it is preferable to replace the offshore crane 12 having a lower lifting capacity in terms of efficient operation of the offshore crane 12. Preferably, the lifting capacity of the offshore crane 12 is not to be less than the weight of the lifting object 10 in consideration of various lifting factor values. In addition, in the fifth step (S18), when the error of the selection of the lifting object 10 or the error of the selection of the offshore crane 12 is determined, the following steps are repeated from the first step (S10). .

The sixth step (S20) is selected for the lifting object 10 in the first step (S10) made in the fifth step (S18) or to the offshore crane (12) made in the second step (S12). If it is determined that there is no error about the selection, the overall process of lifting and loading the lifting object 10 using the marine crane 12 selected in the second step S12 is performed in a virtual space. The simulation is conducted through a program that considers the dynamics and finally performs a safety review before actual lifting and loading.

In this case, the simulation of the entire process from lifting to loading is implemented by a scenario configured in consideration of working environment and fluid characteristics in consideration of actual environmental factors and working conditions, and in particular, according to dynamic calculations, collision inspection, and hydrodynamic calculations The result is visualized and printed.

In this case, the fluid properties are obtained from the behavior properties according to the shape and properties of the marine object. In addition, the dynamics calculation calculates the interaction between the objects configured in the simulation environment by unit time to inform the position and velocity of the object in the next step, and the collision check calculates the collisions between the objects by using the shape of the triangle mesh. The exact collision location, impact depth, direction and the like, and hydrodynamic calculation is informed by calculating the movement by buoyancy, waves, etc. of the object floating on the sea, such as a marine crane (12).

In addition, through the simulation results, it is possible to obtain tension graphs, posture changes, collisions, and the like for the entire work process. It provides a basis for considering changes to parts. In the simulation of the overall process from the sixth step S20 to the lifting and mounting of the lifting object 10 using the offshore crane 12, the following steps are repeated from the first step S10 when the error is determined. Will perform.

In the seventh step S22, if no abnormality is found in the simulation process in the sixth step S20, the lifting object 10 selected in the first step S10 is moved to the second step S12. Using the selected offshore crane 12) to actually implement the entire process of lifting and mounting.

As described above with reference to the accompanying drawings for the preferred embodiment of the present invention, the present invention is not limited by the above-described specific embodiments, those of ordinary skill in the art to which the present invention belongs Various modifications and variations are possible within the scope of the spirit and scope of the present invention as set forth below.

1 is a flow chart illustrating a method of operating a marine crane of the present invention.

FIG. 2 is a flowchart illustrating a process of selecting a marine crane corresponding to a weight of a lifting object selected in the first step of FIG. 1 and selecting a lifting and mounting method according to the above.

3 illustrates the difference in load on each hook according to the difference between the predicted center of gravity and the actual center of gravity for the lifting object.

4 illustrates load results for verification of the setting of the center of gravity factor.

5 illustrates the results of simulating the slope factor.

6 is a view illustrating a state in which a plurality of offshore cranes are coupled in a rigid connection manner.

7 illustrates a state in which a plurality of offshore cranes are coupled in a flexible connection manner.

8 illustrates horizontal movement occurring between multiple offshore cranes.

9 illustrates a sling angle occurring between multiple offshore cranes.

10 and 11 illustrate the difference in horizontal displacement according to the connection between a plurality of offshore cranes.

<Description of Symbols for Main Parts of Drawings>

10-lifted object 12-offshore crane

14-boom 16-wire

18-floating structures

Claims (6)

In operating a large number of offshore cranes, it is possible to more conveniently verify the lifting capacity of lifting objects using offshore lanes by processing the overall work process for connection, lifting, moving, loading, and use of all equipment. As a method of operating a marine crane to improve the turnover of the dock and thereby to improve the construction capacity of the shipyard by promoting the manufacture of extra-large blocks in the construction of ships and offshore structures, Using the system designed exclusively for ship design and the enterprise resource plan (ERP), an enterprise-wide resource management program, an estimated quantity similar to the actual weight is calculated based on the block weight in the design program and the manufacturing weight value listed in the ERP system. 10) selecting the first step (S10) to estimate the weight of the selected lifting object (10); By using the design-only system and the ERP program of the system in consideration of the weight of the lifting object 10 estimated in the first step (S10) by operating in parallel a plurality of offshore crane 12 having a suitable lifting capacity Based on the overall lifting and mounting method to operate, by operating a synchronization system for electrically connecting a plurality of offshore cranes 12 to simultaneously control the operation of the other slave offshore cranes in the master offshore crane A second step S12 of selecting a marine crane 12 corresponding to the weight of the lifting object 10 selected in step S10 and a lifting and mounting method accordingly; Weight Accuracy Factor, Center Of Gravity Factor (COG), Tilt Factor, Dynamic Amplification Factor, Multiple Cranes Using the Design Only System and ERP Program of the System Estimation of the lifting object 10 selected through the first step S10 based on a multi crane factor, an operation factor, a connection factor or a yaw factor. A third step (S14) of calculating a lifting factor according to a weight and a lifting and mounting method selected through the second step (S12); By using the design-only system and the ERP program of the system, various lifting factor values calculated in the third step (S14) are calculated based on the liftable load of the marine crane (12) selected in the second step (S12). It is determined by calculating a weight suitable for actually lifting and mounting, and multiplying each of the lifting factor values calculated in the third step (S14), and then, the marine crane 12 selected in the second step (S12) Calculate the weight value suitable for actual lifting and mounting by dividing with respect to the loadable load value of in the third step (S14) from the loadable load of the marine crane 12 selected in the second step (S12) Dividing the calculated lifting factor to determine a weight suitable for actual lifting and mounting (S16); The weight of the lifting object 10 estimated in the first step S10 and the actual lifting of the offshore crane 12 calculated in the fourth step S16 by using the design-only system and the ERP program of the system; The weight of the lifting object 10 selected in the first step S10 is excessively small or the lifting of the marine crane 12 selected in the second step S12 with respect to the weight calculated by comparing the weight suitable for mounting. If the capacity is excessively large, the selection of the lifting object 10 made in the first step S10 is reselected as a larger weight, or the selection of the offshore crane 12 made in the second step S12 is smaller. By reselecting the equipment having the lifting capacity, the error of the selection of the lifting object 10 made in the first step S10 or the selection of the offshore crane 12 made in the second step S12 is verified. A fifth step S18; Selection of the lifting object 10 made in the first step S10 or the offshore crane made in the second step S12 using the design-only system and the ERP program of the system (S18). If it is determined that there is no error in the selection of 12), using the marine crane 12 selected in the second step (S12) to perform a simulation over the entire process from the lifting and mounting of the lifting object 10 Sixth step (S20); And If there is no abnormality in the sixth step S20 using the design-only system and the ERP program of the system, the lifting object 10 is lifted using the marine crane 12 selected in the second step S12. And a seventh step (S22) which actually carries out the whole process leading to mounting. The method of claim 1, wherein the second step (S12) is a second-first step (S12-1) for determining the quantity of the offshore crane (12) single or multiple, and the plurality of offshore crane (12) In the case of the second or second step (S12-2) to determine the direct or indirect connection method, and the second or third step (S12-3) to determine the form of the movement to transport the lifting object 10 in a short or long distance (S12-3) And a lifting factor value calculated according to the determination of each of the steps (S12-1, S12-2, S12-3) is set differently. The marine crane 12 of claim 2, wherein the plurality of offshore cranes 12 are synchronized with each other when the plurality of offshore cranes 12 are determined in step 2-1 (S12-1). Operating method. delete The method of claim 1, wherein the following process is repeated from the first step (S10) when the error of the selection of the lifting object 10 or the error of the selection of the marine crane 12 in the fifth step (S18). Operation method of the offshore crane (12), characterized in that performed. The method according to claim 1, wherein in the sixth step (S20) to determine the error in the simulation of the overall process from the lifting and mounting of the lifting object 10 using the offshore crane 12 from the first step (S10) to Operation method of the offshore crane 12, characterized in that to repeat the process.

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