Variable lifting jig and lifting system

Abstract

A variable lifting jig and a lifting system are disclosed. The disclosed variable lifting jig includes a pair of jig frames and a connecting member disposed between the pair of jig frames and configured to adjust the gap between them.

Description

Technology Field

[0001] A variable lifting jig and a lifting system are disclosed. More specifically, a variable lifting jig and a lifting system configured to precisely control and lift modules of various sizes are disclosed. Background Technology

[0002] In the past, a method using a strand jack-up device was widely used to lift a pre-assembled heavy-duty steel structure (hereinafter simply referred to as a 'module') to install a lower support, or to install a connecting member that can be suspended from the top of the structure and hung from the module, and then fix it in an accurate position. However, it takes a considerable amount of time to lift a heavy-duty module using a strand jack-up device and then lower it to fix it precisely. Furthermore, using this device entails the inconvenience of having to install an embedded plate in advance on the upper beam of the building frame and weld a lug plate.

[0003] In other words, the conventional method requires preliminary work, such as installing embedded steel in the building frame and welding lug plates, to install pre-assembled heavy-duty steel structures. This results in problems such as relatively long working hours, fire hazards from welding, reduced safety due to increased work at heights, and decreased work efficiency.

[0004] Furthermore, module lifting is, in principle, impossible in locations where embedded steel is not installed, and even in the case of RC or PC frames, lifting is impossible without installing separate lifting lug plates. For example, in PC construction frames, embedded steel must be installed in advance during PC fabrication; this requires a very complex manufacturing process, leading to increased production costs and delays in the production period. As another example, in the case of steel structures, structural reinforcement such as stiffeners is required to attach lug plates capable of strand jacking to the steel frame; if on-site welding is difficult or impossible due to material properties, there is the inconvenience of having to pre-fabricate steel members at a factory and bring them to the site. Similarly, in LFC or LFG frame construction methods, embedded steel must be pre-installed at the factory before LFC or LFG members can be fabricated.

[0005] Even for a frame with embedded steel installed, additional welding work for lug plates is required at the construction site, which exposes the structure to fire hazards and requires additional personnel, such as the separate placement of fire watchers. To bring lug plates to the site and install them, vertical and horizontal transport is required, and lifting equipment such as forklifts and cranes must be mobilized along with additional personnel, such as signalmen and guides, for handling heavy loads.

[0006] After the welding of the lug plate is completed, a wire for the strand jack-up must be installed, the module must be moved, and a jack-up hydraulic device and a lifting jig must be connected to the wire. Since this wire installation work must be performed at a high altitude, a table lift device is required, and a large number of personnel must be deployed due to the weight of the wire itself.

[0007] Heavy lifting equipment such as a forklift is required to move the jack-up hydraulic device and hydraulic pump, and power connection, hydraulic hose connection, and connection with the lifting jig must also be performed.

[0008] Due to the slow lifting speed, long waiting times are required, and after the lifting operation is completed, the equipment must be disassembled and dismantled in reverse order; since this process is mostly performed manually, it requires a significant amount of time and manpower.

[0009] In addition, when the building structure is made of steel rather than concrete, the steel structure must be reinforced with stiffeners or lug plates must be welded in advance to apply the strand jack-up device, but there is a risk of thermal deformation of the steel during this process.

[0010] In addition, the efficiency of construction work may decrease due to increased incidental tasks resulting from higher costs associated with renting heavy equipment, rising construction costs due to fire risks associated with welding, insufficient storage space for equipment on-site, and equipment movement according to the process.

[0011] When the work time is prolonged and site conditions are complex, construction complexity due to the installation of long wires used in strand jack-up devices and safety issues due to welding may become more pronounced.

[0012] In addition, when a lifting jig is stored and then moved for use, it must be transported by forklift or manpower, and there is the inconvenience of having to move the hydraulic device and the hydraulic hose connected thereto by forklift, etc. The problem to be solved

[0013] One embodiment of the present invention provides a variable lifting jig configured to precisely control and lift modules of various sizes.

[0014] Another embodiment of the present invention provides a lifting system comprising the variable lifting jig and the module lift. means of solving the problem

[0015] One aspect of the present invention is,

[0016] A pair of jig frames; and

[0017] The present invention provides a variable lifting jig comprising a connecting member disposed between a pair of jig frames and configured to adjust the gap between them, wherein the pair of jig frames each comprise a kingpin module mounted on their respective bottom surfaces.

[0018] The above kingpin module may include a kingpin housing having a pair of horizontal rails installed thereon, a pair of covers covering the front and rear of the kingpin housing, a slider configured to move horizontally along the horizontal rails of the kingpin housing, and a kingpin vertically coupled to the slider and configured to move horizontally together as the slider moves horizontally.

[0019] The above connecting member may include a slide-type telescopic structure, a screw-driven structure, a hydraulic cylinder, or a gear rack mechanism.

[0020] The above connecting member can be replaced with a separate connecting member of a different length.

[0021] Another aspect of the present invention is,

[0022] The above variable lifting jig; and

[0023] A lifting system comprising a modular lift configured to lift the above variable lifting jig is provided.

[0024] The above module lift may include a kingpin fixing device configured to fix a kingpin provided in the kingpin module.

[0025] The above-described module lift may further include a base frame, a plurality of outriggers coupled to the base frame, a multi-stage mast coupled to the base frame, a fork coupled to the uppermost mast among the multi-stage masts and configured to move up and down together as the uppermost mast slides up and down, and a fine position adjustment device mounted on the fork.

[0026] The plurality of outriggers includes a pair of front outriggers and a pair of rear outriggers, each of the pair of front outriggers is formed as a single section and configured to be rotatable around a single horizontal rotation axis, and each of the pair of rear outriggers includes a first section and a second section, the first section is capable of horizontal rotation with respect to the base frame, and the second section is capable of horizontal rotation with respect to the first section.

[0027] The above kingpin fixing device can be positioned on the upper part of the above fine position adjustment device.

[0028] The above kingpin fixing device may include a frame and a pair of kingpin locking devices coupled to the frame.

[0029] The above frame may include a kingpin guide.

[0030] The above pair of kingpin locking devices are spaced apart from each other and positioned to face each other, and may each include a cylinder body, a piston mounted within the cylinder body, and a piston rod connected to the piston.

[0031] A pair of piston rods included in the above pair of kingpin locking devices may be configured such that one side has a groove structure and the other side has a projection structure so as to interlock with each other.

[0032] The above module lift may further include a fall prevention device.

[0033] The above fall prevention device may include a ratchet module installed on the multi-stage mast and a hydraulic device for fall prevention. Effects of the invention

[0034] A variable lifting jig and a lifting system according to one embodiment of the present invention have the following advantages:

[0035] (1) Even at sites where the allowable load capacity of the floor is low, heavy steel structures can be lifted and fixedly installed in the desired precise position by fine adjustment.

[0036] (2) Modules that are divided and segmented into sizes suitable for general road transport can be installed.

[0037] (3) The variable lifting jig is equipped with high-load free casters so that it can be moved and is designed to be towed by a forklift depending on the usage environment.

[0038] (4) The module lift is equipped with a kingpin fixing device having a kingpin guide in the shape of a fan at a certain angle, so that when the module lift approaches the variable lifting jig, the kingpin is guided along the kingpin guide and is accurately seated in the center of the fork hole of the variable lifting jig even if the position is not accurately aligned, thereby making position correction easy and enabling quick connection.

[0039] (5) In addition, the module lift is equipped with a kingpin locking device that automatically locks when the kingpin mounted on the variable lifting jig is connected, so that it can support lifting operations in a securely fixed state.

[0040] (6) The kingpin locking device is designed to be unlocked through a separate device without applying physical force, so the operator can remotely control the separation of the kingpin locking device and the kingpin from a distance away from the equipment, thereby improving operational efficiency.

[0041] (7) When lifting using a modular lift, a movable kingpin is used so that even if the position is slightly off in the horizontal direction, the kingpin moves naturally and is accurately guided to the center of the kingpin fixing device, allowing for quick and stable fixation.

[0042] (8) In addition, a fine position adjustment device is installed in the fork of the multiple module lifts capable of multi-group ultra-precision synchronized control so that it can accommodate different module specifications and shapes, and the installation work can be performed with the same equipment even if the module specifications are changed through a variable lifting device and a kingpin module installed at the bottom thereof.

[0043] (9) Two pairs of front and rear outriggers are installed in the modular lift to efficiently distribute the load considering the load-bearing capacity of the building and to prevent tipping due to lateral forces during fine position adjustment. The outriggers can be extended in length, and in particular, the rear outrigger is designed with a two-axis structure to effectively avoid obstacles while providing stable support.

[0044] (10) The X and Y tilt sensors are installed in the synchronized control module lift, so that each piece of equipment can automatically adjust its vertical alignment when the outrigger is operated. This automatic vertical alignment device enables quick and precise equipment setting. Brief explanation of the drawing

[0045] FIG. 1a is a perspective view showing the contracted state of a variable lifting jig according to one embodiment of the present invention. FIG. 1b is a perspective view showing the extended state of a variable lifting jig according to one embodiment of the present invention. FIG. 1c is a side view of a variable lifting jig according to one embodiment of the present invention. FIG. 2 is a perspective view of a kingpin module mounted on the bottom surface of a variable lifting jig according to one embodiment of the present invention. Figure 3 is a drawing illustrating a method for adjusting the width of a variable lifting jig using connecting members of various sizes. FIG. 4 is a perspective view of a modular lift configured to raise and lower a variable lifting jig according to one embodiment of the present invention. Figure 5 is an enlarged view of the kingpin fixing device portion installed on the module lift of Figure 4. Figure 6 is a diagram showing the state in which the kingpin of the kingpin module is fixed by a kingpin fixing device. Figure 7 is a diagram illustrating the principle in which the kingpin of a kingpin module is fixed by a kingpin fixing device. FIG. 8 is a drawing showing a variable lifting jig with a stopper installed and a module mounted thereon. FIG. 9 is a drawing showing a variable lifting jig with a module support installed and a module mounted thereon. FIG. 10 is a drawing showing the state of lifting a module using a variable lifting jig and a module lift according to one embodiment of the present invention. Specific details for implementing the invention

[0046] Hereinafter, a variable lifting jig according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0047] In this specification, "kingpin" refers to a member that connects and combines a variable lifting jig and a modular lift.

[0048] FIG. 1a is a perspective view showing the contracted state of a variable lifting jig (100) according to one embodiment of the present invention, FIG. 1b is a perspective view showing the expanded state of a variable lifting jig (100) according to one embodiment of the present invention, and FIG. 1c is a side view of a variable lifting jig (100) according to one embodiment of the present invention.

[0049] Referring to FIGS. 1a to 1c, a variable lifting jig (100) according to one embodiment of the present invention includes a pair of jig frames (110) and a connecting member (120).

[0050] The variable lifting jig (100) is designed to enable both movement of the module and installation through lifting. When moving, it can not only have an independent moving power built into the device but also be used in combination with a separate moving device (electric mover), thereby increasing the versatility of the device. In addition, a heavy-duty precaster is applied to the bottom so that it can be easily moved by manpower alone without the need for separate large equipment, and towing using a forklift is also possible if necessary, maximizing convenience and efficiency at the work site. Furthermore, when a module lift directly lifts the module, it is essential to install a separate stiffener to prevent deformation of the structural steel at the lifting point, but when using the variable lifting jig (100), the load can be widely distributed and supported, making a separate stiffener unnecessary.

[0051] In addition, the variable lifting jig (100) includes a load distribution function so that the load can be evenly distributed so that a concentrated load does not occur on the floor slab of the building when the module is moved.

[0052] In addition, the variable lifting jig (100) is developed to allow the application of the modular construction method in various forms, and is designed to lift and install multiple structures divided in the horizontal direction or multiple modules segmented in the vertical direction, thereby supporting the construction of various divided and segmented modules.

[0053] In addition, the variable lifting jig (100) is designed with a structure that can stably move, lift, and install modules of various sizes and shapes, taking into account that the module size is not constant depending on the shape and size of the pipes or facilities placed within the module and that the size may vary depending on the installation location at each site. This is characterized by the ability to flexibly respond to various requirements at the site.

[0054] FIG. 2 is a perspective view of a kingpin module (140) mounted on the bottom surface of a variable lifting jig (100) according to one embodiment of the present invention.

[0055] Referring to FIG. 2, a pair of jig frames (110) may each include a kingpin module (140) mounted on their respective bottom surfaces.

[0056] The kingpin module (140) is attached to the variable lifting jig (100) and can be designed and manufactured to be accurately placed at a location where the size, load, and lifting points of the module are calculated and confirmed in advance. Basically, the kingpin module (140) is installed at four locations on the variable lifting jig (100), but if the load of the module is excessively large, the number of kingpin modules (140) can be increased so that the module can be lifted using six module lifts (200) instead of four module lifts (200).

[0057] The kingpin module (140) may include a kingpin housing (141), a pair of covers (142), a slider (143), and a kingpin (144).

[0058] A pair of horizontal rails are installed in the kingpin housing (141), so that the slider (143) can be configured to move freely along these horizontal rails within a certain range (e.g., about ±100 mm). This structure allows the slider (143) to move left and right and automatically align the connection point even if the module lift (200) approaches a slightly misaligned position, thereby enabling quick and simple connection without the need for precise horizontal alignment. Additionally, after connection, the slider (143) is firmly supported within the range of movement along the horizontal rails, ensuring mechanical connection strength between the devices, while also providing ample surrounding space during installation, thereby providing sufficient workspace for efficiently installing the pre-assembled structure.

[0059] A pair of covers (142) can be configured to cover the mutually facing sides of the kingpin housing (141) to act as stoppers that restrict movement so that the slider (143) does not advance or retract beyond a certain range.

[0060] The slider (143) can move horizontally along the horizontal rail of the kingpin housing (141), and the kingpin (144) connected thereto can move horizontally together with the movement of the slider (143).

[0061] In addition, the kingpin (144) is vertically connected to the slider (143), but is configured to be supported by resting on the jaw structure (i.e., horizontal rail structure) within the kingpin housing (141) even if it is free to move, so that it does not detach downwards.

[0062] In addition, the height of the kingpin module (140) from the ground in the normal state of the variable lifting jig (100) (specifically, the height of the kingpin (144)) is designed to match the height of the standard kingpin fixing device (270) of the module lift (200), so that the kingpin (144) and the kingpin fixing device (270) can be smoothly connected without separate level adjustment.

[0063] Through this structure, the kingpin module (140) can simplify the process of combining the module lift (200) and the variable lifting jig (100) and increase the precision of the combination, while also supporting fast and safe lifting operations.

[0064] Additionally, a pair of jig frames (110) may each include a wheel (130), a mounting bracket (150), a stopper (160), a chain block (170), a module support (180), or a combination thereof.

[0065] The wheels (130) are designed with heavy-duty free casters so that the variable lifting jig (100) can be easily moved without the need for separate lifting equipment. In particular, each of the multiple wheels (130) is equipped with an independent suspension function, so that even if there are protrusions or grooves on the ground surface of the path of movement, only the corresponding wheel can absorb the shock through the suspension and move smoothly.

[0066] In addition, by using a caster with three or more axes that can move forward and backward in a straight line without drawing the P-shaped reverse trajectory seen in standard casters when changing direction, precise and efficient movement is possible even in narrow or complex construction sites.

[0067] This design effectively mitigates impacts occurring during movement and prevents damage to the floor slab, and evenly distributes the module load and variable lifting jig load within the slab's allowable load even at sites with very low floor allowable loads, thereby enabling the safe and efficient movement, lifting, and installation of high-load pre-assembled steel modules.

[0068] A connecting member (120) can be configured to be placed between a pair of jig frames (110) to adjust the gap between them.

[0069] To adjust the gap between a pair of jig frames (110), the connecting member (120) may include a sliding telescopic structure, a screw drive structure, a hydraulic cylinder, or a gear rack mechanism.

[0070] When the connecting member (120) is configured to have a sliding telescopic structure, a space is formed between the outer tube and the inner tube inserted therein. In this space, a guide rail is installed to form a friction surface to reduce friction between the outer tube and the inner tube, thereby allowing the inner tube to slide freely in the axial direction within the outer tube to adjust its width. Additionally, after adjusting the length (width), the module is fixed at a desired position using a tightening bolt, a pin fixing device, or an automatic locking device, so that when installing the module, the width of the variable lifting jig (100) is maintained at the designed width, allowing the module to be lifted stably.

[0071] In the case of a screw drive structure, the connecting member (120) includes a fixed tube and a screw shaft installed therein, and a sliding block is coupled to the screw shaft so that it moves in a straight direction according to the rotation of the screw shaft. The screw shaft can be rotated by a handle, a manual crank, or an electric motor, and the gap between the jig frames is adjusted by the forward and backward movement of the sliding block. A limit stopper or an end limiter may be installed to prevent excessive movement.

[0072] In the case of a hydraulic cylinder structure, the connecting member (120) consists of a cylinder body, a piston inserted therein, and a piston rod coupled to the piston. The tip of the piston rod is fixed to one jig frame, and the cylinder body is fixed to another jig frame. The distance between the frames is adjusted as the piston rod moves forward or backward according to the supply of hydraulic fluid. Additionally, movement speed and position control are possible through a hydraulic valve or a flow control device.

[0073] In the case of a gear rack mechanism structure, the connecting member (120) is configured such that a rotating shaft is positioned at the center and a gear fixed thereto engages with two racks positioned in opposite directions. When the gear rotates, the racks on both sides move simultaneously in opposite directions, thereby uniformly adjusting the spacing between the jig frames. Precise position control is possible by using a gearbox, a reduction gear, and an electric motor together, and a rack fixing device may be added for position fixing.

[0074] FIG. 3 is a drawing for explaining a method of adjusting the width of a variable lifting jig (100) using connecting members (120, 121, 122, 123) of various sizes. FIG. 3 (a) shows the connecting members (120, 121, 122, 123) in a state of maximum contraction, and FIG. 3 (b) shows the connecting members (120, 121, 122, 123) in a state of maximum expansion.

[0075] Referring to FIG. 3, the connecting member (120) can be replaced with separate connecting members (121, 122, 123) of different lengths. That is, if the width of the module varies according to site conditions or design specifications, the user can select and replace the connecting member of a suitable length to adjust the spacing between a pair of jig frames (110). This allows for the flexible lifting and installation of modules with various widths while utilizing the same variable lifting jig (120), thereby expanding the scope of application of the modular construction method at the construction site and improving construction efficiency.

[0076] Also, referring to FIG. 3, in the case of a wide connecting member (123) depending on the size of the module, a reinforcing member (124) can be attached to the bottom to strengthen the material.

[0077] FIG. 4 is a perspective view of a module lift (200) configured to raise and lower a variable lifting jig (100) according to one embodiment of the present invention.

[0078] Referring to FIG. 4, a module lift (200) configured to raise and lower a variable lifting jig (100) according to one embodiment of the present invention adopts a three-stage low-profile and high-profile structure, and is designed to be applicable not only to a single pre-assembled structure (module) but also to each module divided into multiple stages.

[0079] The variable lifting jig (100) lifts the module by placing it on the upper surface, and even if the module is placed eccentrically, efficient operation is possible through the synchronized control and fine position adjustment functions of the module lift (200). In addition, the variable lifting jig (100) is equipped with the function to install a pre-assembled module on a bracket installed on the ceiling at an accurate position, thereby greatly improving the precision and efficiency of module installation.

[0080] The module lift (200) can be combined with a fine position adjustment device (260) described later to precisely perform positional movement and level adjustment of the module, and can be configured to flexibly respond to the installation of modules of various sizes and shapes.

[0081] Specifically, the module lift (200) may include a base frame (201), a plurality of outriggers (210), a multi-stage mast (220, 230, 240), a fork (250), a fine position adjustment device (260), and a kingpin fixing device (270).

[0082] The base frame (201) may be a substructure that rests on the ground to support the load of the entire module lift (200) and stably supports and fixes each component. Additionally, the base frame (201) may be equipped with wheels or a means of movement for movement as needed.

[0083] A plurality of outriggers (210) can be attached to the base frame (201) of the module lift (200). These outriggers (210) can be designed to effectively distribute the load generated when the module lift (200) lifts or installs a module within the allowable load-bearing capacity of the building. This is intended to mitigate localized concentrated loads applied to the floor slab, thereby reducing the risk of equipment overturning and ensuring overall operational stability.

[0084] Specifically, the outrigger (210) of the recovery bird may include a pair of front outriggers (211) and a pair of rear outriggers (212). Each of the pair of front outriggers (211) consists of a single section and can rotate around a single horizontal rotation axis (SP). In particular, it is designed to rotate upward to provide diagonal support, thereby increasing overturning safety even at high lifting positions, and can flexibly respond to various working conditions by adjusting the length according to the lifting height.

[0085] On the other hand, a pair of rear outriggers (212) may each be manufactured with a two-axis structure including a first section and a second section. The first section is horizontally rotatable relative to the base frame (201), and the second section is horizontally rotatable relative to the first section. To this end, each rear outrigger includes two horizontal rotation axes (DP), and thanks to this two-axis structure, even if interference with a building column, an outer wall, or other obstacle occurs, it can effectively avoid the obstacle and maintain a stable support function.

[0086] Each outrigger (211, 212) can freely adjust its angle in a diagonal direction, thereby reducing the risk of equipment tipping over due to lateral forces that may occur during fine positioning during installation and ensuring overall operational stability. As such, the outriggers (210), which are arranged in pairs at the front and rear respectively, can be extended or shortened in length as needed to flexibly adjust the support range in various installation environments.

[0087] In addition, a ground connection plate that contacts the ground to transmit the load may be installed in the hydraulic system of the outrigger. This ground connection plate can be designed to change its size according to the floor's allowable load conditions; in particular, if the floor's allowable load is low, it can be replaced with a wider connection plate to maximize the load distribution effect, thereby supporting safe lifting operations optimized for site conditions.

[0088] The multi-stage mast (220, 230, 240) can be combined with the base frame (201).

[0089] Specifically, the multi-stage mast (220, 230, 240) can be designed with a three-stage structure similar to a forklift mast, and each mast stage is fitted vertically so that they slide relative to each other, allowing the module to be efficiently lifted to a high position at the installation site. In particular, a fork (250) is attached to the top mast (240) to perform the function of lifting the module vertically while rising to the top. Therefore, the height of the module can be adjusted by adjusting the height of the multi-stage mast (230, 240).

[0090] Each mast section is machined into a U-shaped, C-shaped, or H-shaped guide structure to resist bending moments generated by the module's load, thereby ensuring high rigidity. Rollers are installed inside these guides to enable smooth and precise vertical movement of the mast, while minimizing deformation under load to maintain stability.

[0091] The fork (250) may be connected to the uppermost mast (240) among the multi-stage masts (220, 230, 240) and configured to move up and down together as the uppermost mast (240) slides up and down.

[0092] Specifically, the fork (250) is formed with a structure similar to the fork section of a forklift to perform the function of supporting and lifting the module, but the fork length can be designed to be relatively short to suit installation space constraints or module characteristics. In addition, the fork (250) can be manufactured with a structure that secures very high rigidity so as to effectively resist large loads and bending moments that occur during the lifting of the module despite its short length.

[0093] More specifically, the fork (250) can be designed to safely and stably support heavy modules by maximizing resistance to twisting and bending through cross-sectional shape, reinforcing rib structure, material selection, etc. Additionally, by being coupled to the uppermost mast (240) among the multi-stage masts (220, 230, 240) to perform vertical movement together, it provides the function of precisely lifting the module to a desired height as the masts (230, 240) rise.

[0094] In addition, the fork (250) is integrally mounted with the fine position adjustment device (260) and kingpin fixing device (270) described later, so that the horizontal and vertical positions can be precisely aligned when installing the module, and support the stable combination and fixing of modules of various sizes and shapes.

[0095] The fine position adjustment device (260) can be designed as an essential position correction device for precisely lifting and installing the building module in an accurate position. This device is configured to stably handle modules of various sizes and shapes, and is particularly mounted on the fork (250) of the module lift (200) to be closely linked with the lifting function.

[0096] The fine position adjustment device (260) includes an actuator system capable of high-precision control, thereby enabling fine movement within a range of approximately 200 mm in the X-axis and Y-axis directions. Additionally, by combining this movement, a function to rotate the module clockwise or counterclockwise can also be implemented. In particular, the fine position adjustment device (260) attached to the fork (250) of the module lift (200) is combined with the kingpin (144) attached to the lower part of the variable lifting jig (100), thereby enabling the module to be accurately attached to a ceiling bracket or hanging member of a building, and shortening the alignment and attachment time of the joining point.

[0097] This rotational function is implemented by keeping two of the four micro-positioning devices (260) installed on the four module lifts (200) in a free-moving state via solenoids and operating only the remaining two, or by fixing one, freeing one, and operating two, thereby enabling precise rotational movement. The rotational force is smoothly transmitted through the bearing structure, and in particular, by installing double tapered roller bearings in both directions, it can withstand vertical loads, rotational force, and tensile loads simultaneously. This enables free rotation while remaining stably constrained even during ascent and descent.

[0098] In addition, the fine position adjustment device (260) is equipped with a hydraulic cylinder-based locking device, which prevents the kingpin (144) from detaching and maintains a stable connection state through bidirectional hydraulic action. Once the module installation is complete, the variable lifting jig (100) can be lowered and dismantled, thereby ensuring both efficiency and safety of the installation work.

[0099] In conclusion, the fine position adjustment device (260) supports three degrees of freedom (3-DOF) of forward / backward direction (MD1), left / right direction (MD2), and rotation (turntable) beyond simple lifting functions, and significantly improves the construction quality of high-rise and large-scale modular buildings through precise position adjustment of the module and minimization of interference.

[0100] FIG. 5 is an enlarged view of the portion of the kingpin fixing device (270) installed on the module lift (200) of FIG. 4, FIG. 6 is a view showing the state in which the kingpin (144) of the kingpin module (140) is fixed by the kingpin fixing device (270), and FIG. 7 is a view explaining the principle of how the kingpin (144) of the kingpin module (140) is fixed by the kingpin fixing device (270). FIG. 7 (a) shows the state in which the kingpin fixing device (270) is unlocked, FIG. 7 (b) shows the state in which the kingpin fixing device (270) is in the process of locking, and FIG. 7 (c) shows the state in which the kingpin fixing device (270) is completely locked.

[0101] Referring to FIGS. 4, 5, and 6, the kingpin fixing device (270) can be mounted directly or indirectly to the fine position adjustment device (260) so as to be positioned in the upper central part of the fine position adjustment device (260). The kingpin fixing device (270) is designed to allow various types of modules to be installed stably without modification, and after installation is complete, the module lift (200) and the variable lifting jig (100) can be easily separated without applying physical force through a remotely controllable unlocking device. In addition, it is designed to allow safe unlocking using a separate hydraulic device even at high-load lifting positions (high positions), thereby greatly improving safety and work convenience during construction.

[0102] The kingpin fixing device (270) is configured to be coupled with the kingpin (144) when a module lift (200) traveling horizontally from the side of a stationary variable lifting jig (100) approaches, via a frame (271) mounted on the upper center of the fine position adjustment device (260).

[0103] The kingpin (144) is assembled inside the kingpin housing (141) and is designed so that while movement in the forward and backward directions is restricted, it can move freely in the left and right directions for a certain distance. The kingpin (144) always descends to the bottom of the kingpin housing (141) due to its own weight and settles thereon, and a jaw structure is formed on the bottom to safely support it so that it does not detach downwards. When the kingpin (144) is seated on this jaw structure, it can move left and right, absorb positional errors, and be naturally guided to the center, allowing for quick and simple assembly without precise horizontal alignment.

[0104] Referring to FIG. 7, the kingpin fixing device (270) may include a frame (271) and a pair of kingpin locking devices (272, 273). The frame (271) includes a kingpin guide (271a) having a fan-shaped entrance, thereby allowing the kingpin (144) attached to the variable lifting jig (100) to be connected by naturally being guided to the center along the inclined fan-shaped guide surface after making contact with a wide area at the entrance, even if the vertical and horizontal positions are not precisely aligned.

[0105] Additionally, the joining step between the kingpin fixing device (270) and the kingpin (144) is performed in such a way that the kingpin (144) slides left and right along the inclined surface of the fan-shaped kingpin guide (271a) and is precisely aligned with the center. This mechanism enables the kingpin (144) to be accurately guided to the center through the effect of a physical guide surface, even if the position is not aligned in a straight line during the initial approach, thereby allowing the joining to be completed.

[0106] When the kingpin (144) is fully inserted into the kingpin fixing device (270), the seating status can be detected via a proximity sensor or other sensor, and based on the sensor signal, a pair of kingpin locking devices (272, 273), including a piston driven by a hydraulic cylinder or electric device, are operated to firmly secure the kingpin (144).

[0107] A pair of kingpin locking devices (272, 273) are spaced apart and positioned facing each other on the frame (271), and each includes a cylinder body (272a, 273a), a piston (272b, 273b), and a piston rod (272c, 273c). The two ends of the piston rods (272c, 273c) are each machined with an intaglio groove structure and a relief projection structure, respectively, and are designed to interlock with each other, so that when the pistons are in close contact, one side wraps around the other side.

[0108] This intaglio and embossed interlocking structure provides a stronger locking function when the kingpin (144) receives a horizontal moving load, as it exerts not only bending resistance of the piston rods (272c, 273c) but also coupling resistance due to the interlocking of the ends of the piston rods (272c, 273c).

[0109] When the kingpin (144) mounted on the variable lifting jig (100) and the module lift (200) equipped with a synchronization control function are combined based on such strong bonding force, the module can be safely lifted while distributing the load against the ground's reaction force during lifting inside the building through the variable lifting jig (100) adjusted to the width of the pre-assembled structure.

[0110] Referring to FIGS. 4 and FIGS. 5, the module lift (200) may further include a fall prevention device (280).

[0111] The fall prevention device (280) is a safety device designed to prevent the mast (230, 240) from unexpectedly descending due to mechanical failure or other reasons during lifting operations. This device automatically engages a linky when the mast (230, 240) descends to mechanically block the fall of the mast (230, 240). This prevents accidents caused by the sudden fall of the load and ensures the safety of the worker. The fall prevention device (280) operates immediately by means of a mechanical operating principle without a separate power supply and is designed not to interfere with the normal lifting and descending operations of the mast (230, 240). This device is constructed with a highly reliable structure and plays an essential role in the safe operation of the mast (230, 240).

[0112] Specifically, the fall prevention device (280) may include a ratchet module (281) and a hydraulic device (282) for fall prevention.

[0113] The ratchet module (281) and the hydraulic device (282) for preventing fall can be installed on the multi-stage mast (220, 230, 240).

[0114] The ratchet module (281) is a mechanical safety device that prevents reverse movement or falling by allowing rotation or movement only in a specific direction. This module is primarily used to prevent the load from suddenly dropping or moving in the opposite direction on the module lift (200) or variable lifting jig (100). The main components of the ratchet module (281) include a ratchet wheel, which is a circular wheel with teeth; a pound (tooth catch) that engages with the teeth of the ratchet wheel to prevent reverse rotation; a spring that pushes the pound toward the ratchet wheel to ensure it is always engaged; and a fixing frame that secures the entire module. The operating principle is that the ratchet wheel rotates freely in the direction of lifting the load, but when attempting to move in the opposite direction, the pound catches on the teeth and immediately stops rotation. In this way, the load is prevented from suddenly dropping, and the module lift (200) or variable lifting jig (100) is kept safe. The ratchet module (281) provides an immediate mechanical locking function without power or external control, and its robust structure enables stable operation over a long period. In particular, it plays an important role in ensuring the safety of workers by preventing unexpected drops during lifting operations.

[0115] The hydraulic device for preventing falls (282) may include a first hydraulic device for preventing falls (282a) and a second hydraulic device for preventing falls (282b).

[0116] The first hydraulic device for preventing falling (282a) is configured to raise and lower the second mast (230) relative to the first mast (220), and the second hydraulic device for preventing falling (282b) may be configured to raise and lower the third mast (240) relative to the second mast (230).

[0117] The drop prevention hydraulic device (282) applies proportional control solenoid technology to control the travel distance of the first drop prevention hydraulic device (282a) and the second drop prevention hydraulic device (282b) by receiving real-time feedback, thereby allowing the multiple drop prevention hydraulic devices (282a, 282b) installed on the multiple module lifts (200) to rise precisely to a constant height without any height deviation when rising. Through this, eccentric loads or unbalanced loads that may occur during lifting are prevented, and the sudden drop of the load is suppressed even in the event of an emergency stop, thereby ensuring the safety of the module and the worker.

[0118] Additionally, the hydraulic device (282) for preventing falling may include an overload prevention device (not shown) by pressure sensing and an over-raising prevention device (not shown) by wire sensor. The pressure sensing device detects when an excessive load occurs and automatically stops the operation to prevent overload. In addition, it can monitor whether there is an abnormality in the machine device by identifying abnormal situations in real time, such as load deviation or sudden load reduction. The wire sensor measures the rising height of the mast (230, 240) in real time and can also check the rising deviation between the masts (230, 240) installed on the multiple module lifts (200). This data is used for deviation control between the masts (230, 240) installed on the multiple module lifts (200), and enables the rising and lowering movements of the masts (230, 240) installed on the multiple module lifts (200) through synchronized control while maintaining the deviation. These functions serve as essential technical elements for the hydraulic device (282) to safely and reliably control the mast.

[0119] Additionally, the module lift (200) may further include a Mecanum wheel (not shown). The Mecanum wheel has a special structure with rollers arranged diagonally around the circumference of the wheel, allowing for free movement in the forward, backward, left, and right directions, as well as diagonal movement and rotation in place, without the need to operate a separate steering device. By applying such a Mecanum wheel, the module lift (200) can precisely adjust the position in the forward, backward, left, and right directions when kingpin-coupled with the variable lifting jig (100), thereby increasing the convenience and accuracy of the installation work and enabling rapid coupling and disassembly.

[0120] Additionally, the module lift (200) may further include a verticality inspection sensor (not shown). This verticality inspection sensor (i.e., a horizontal sensor) measures the inclination in the X-axis and Y-axis directions of each lift in real time, and is configured to precisely inspect the verticality of all module lifts (200) before lifting the pre-assembled structure, even after the combination of the variable lifting jig (100) and the module lift (200) is completed.

[0121] The measured tilt data is detected in real time by the horizontal sensor and transmitted to the central control unit. Based on this data, the central control unit determines the current verticality status of the device and, if necessary, automatically adjusts the position or angle of the equipment to maintain an optimal horizontal state. If the verticality deviates from the allowable error, hydraulic cylinders mounted on multiple outriggers (210) operate automatically. These hydraulic cylinders automatically correct the verticality of the entire system by slightly expanding and contracting the outriggers (210) relative to the ground to lift or lower the tilted direction of the module lift (200) to the opposite side.

[0122] Through this automatic verticality adjustment mechanism, all module lifts (200) can perform safe and precise lifting operations while maintaining the same vertical state without separate manual adjustment.

[0123] Additionally, the module lift (200) may further include an electric panel (290).

[0124] The electric panel (290) may be connected to the first mast (220), second mast (230), third mast (240) and / or other parts and configured to supply electricity and transmit signals to each part of the module lift (200).

[0125] FIG. 8 is a drawing showing a variable lifting jig (100) with a stopper (160) installed and a module (300) mounted thereon.

[0126] Referring to FIG. 8, a stopper (160) is installed on the top of the variable lifting jig (100) to guide the module (300) to be seated in the correct position and to simply restrict movement. The stopper (160) can be designed to minimize separate bolt or nut fastening work, thereby shortening installation time and simplifying the procedure, which improves the safety of the worker and the freedom of operation of the equipment, and is particularly advantageous for the installation of upper rack modules made in a block shape.

[0127] In addition, the module (300) can be firmly connected to the variable lifting jig (100) via the chain block (170) to prevent detachment or falling.

[0128] FIG. 9 is a drawing showing a variable lifting jig (100) with a module support (180) installed and a module (300) mounted thereon.

[0129] Referring to FIG. 9, when the shape of the module (300) installed on the variable lifting jig (100) is different, especially when there is no separate support member, the lower end of the horizontal member (310) of the module (300) is supported by the module support (180) to place the module (300) on the upper part of the variable lifting jig (100). At this time, since a bracket (330) connected to the column (320) of the module (300) is often installed, the module (300) must be raised by the height of the bracket (330) to place it on the upper part of the variable lifting jig (100).

[0130] In addition, to prevent the module (300) from coming off, a module support (180) with a stopper function may be installed on the variable lifting jig (100).

[0131] In addition, support fixing holes (not shown) may be provided at various locations on the upper part of the variable lifting jig so that various types of module supports (180) can be installed.

[0132] Another aspect of the present invention provides a lifting system comprising a variable lifting jig (100) and a module lift (200).

[0133] The module lift (200) can be configured to lift a variable lifting jig (100).

[0134] FIG. 10 is a drawing showing a state in which a module (300) is lifted using a variable lifting jig (100) and a module lift (200) according to one embodiment of the present invention. Specifically, a kingpin fixing device (270) mounted on the fork (250) of the module lift (200) is coupled with a kingpin (144) installed on the lower part of the variable lifting jig (100), so that the module (300) is shown in a state in which it is raised through the module lift (200). This drawing visually shows the state immediately before the module (300) is transported to an installation location in a building and coupled to a ceiling bracket or structural member, and is configured to allow verification of the attitude, position, and support method of the module (300) in the lifting state. Through this, the process of the module lift (200) and the variable lifting jig (100) interacting to safely and precisely handle the module (300) can be visually understood.

[0135] Additionally, the lifting system may include a plurality of module lifts (200) having a synchronized control function. The plurality of module lifts (200) are configured so that each module lift (200) individually lifts a module (300) and adjusts its position, while simultaneously allowing the operation between the multiple module lifts (200) to be precisely synchronized (synchronized) through a central control system (not shown).

[0136] This synchronized control function supports the real-time control of the lifting speed, position, and load distribution of each module lift (200), particularly when multiple module lifts (200) simultaneously lift large modules (300) of different widths and lengths, thereby preventing distortion, tilting, impact, etc. of the modules (300) and enabling precise alignment of the joining points for installation.

[0137] Multiple module lifts (200) having a synchronized control function are used in combination with a variable lifting jig (100) and can flexibly respond to changes in the shape of modules (300) having various widths and lengths. For example, even when installing modules (300) with widths that vary drastically from 3m to 11m, such as a structure where upper pipe racks and lower pipe racks intersect at right angles, the module lifts (200) can be lifted safely and precisely while maintaining balance through synchronized control between the module lifts (200).

[0138] In addition, at the site, the aforementioned multiple module lifts (200) are used sequentially during the process of installing modules of various sizes, ranging from truckable modules that can be transported by truck to large modules. When lifting and joining modules in the order of the middle and bottom sections after the top module is installed, synchronized control between the module lifts (200) is utilized to enable accurate positional alignment and fastening of the joining points between modules.

[0139] In this way, a lifting system including multiple synchronized control module lifts (200) can maintain speed and precision even during repeated assembly and disassembly processes, and maximize construction efficiency.

[0140] The present invention has been described with reference to the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims. Explanation of the symbols

[0141] 100: Variable lifting jig 110: Jig frame 120, 121, 122, 123: Connecting members 130: Wheel 140: Kingpin Module 141: Kingpin Housing 142: Cover 143: Slider 144: Kingpin 150: Mounting bracket 160: Stopper 170: Chain Block 180: Module support 200: Module lift 210: Outrigger 220, 230, 240: Mast 250: Fork 260: Fine position adjustment device 270: Kingpin fixing device 271: Frame 271a: Kingpin guide 272, 273: Kingpin lock 272a, 273a: Cylinder body 272b, 273b: Piston 272c, 273c: Piston rod 280: Drop prevention device 281: Ratchet module 282, 282a, 282b: Hydraulic device for fall prevention 290: Electric panel 300: Module MD1: 1st direction hs1, hs2: Hydraulic hose MD2: Second Direction

Claims

Claim 1 A variable lifting jig comprising: a pair of jig frames; and a connecting member disposed between the pair of jig frames and configured to adjust the gap between them, wherein the pair of jig frames each comprise a kingpin module mounted on their respective bottom surfaces, and the kingpin module comprises a kingpin housing with a pair of horizontal rails installed thereon, a pair of covers covering the front and rear surfaces of the kingpin housing, a slider configured to move horizontally along the horizontal rails of the kingpin housing, and a kingpin vertically coupled to the slider and configured to move horizontally together as the slider moves horizontally. Claim 2 delete Claim 3 In claim 1, the connecting member is a variable lifting jig comprising a slide-type telescopic structure, a screw-driven structure, a hydraulic cylinder, or a gear rack mechanism. Claim 4 In claim 1, the connecting member is a variable lifting jig that can be replaced with a separate connecting member of a different length. Claim 5 A lifting system comprising a variable lifting jig according to any one of claims 1, 3 and 4; and a modular lift configured to lift the variable lifting jig. Claim 6 In paragraph 5, the module lift is a lifting system comprising a kingpin fixing device configured to fix a kingpin provided in the kingpin module. Claim 7 In claim 6, the module lift further comprises a base frame, a plurality of outriggers coupled to the base frame, a multi-stage mast coupled to the base frame, a fork coupled to the uppermost mast among the multi-stage masts and configured to move up and down together as the uppermost mast slides up and down, and a fine position adjustment device mounted on the fork. Claim 8 A lifting system according to claim 7, wherein the plurality of outriggers comprises a pair of front outriggers and a pair of rear outriggers, wherein the pair of front outriggers are each formed as a single section and configured to be rotatable about a single horizontal rotation axis, and the pair of rear outriggers each comprise a first section and a second section, wherein the first section is capable of horizontal rotation with respect to the base frame and the second section is configured to be capable of horizontal rotation with respect to the first section. Claim 9 In claim 7, the kingpin fixing device is a lifting system positioned on the upper part of the fine position adjustment device. Claim 10 In claim 9, the lifting system comprises a frame and a pair of kingpin locking devices coupled to the frame, wherein the kingpin fixing device is a frame. Claim 11 In Clause 10, the above frame is a lifting system including a kingpin guide. Claim 12 In claim 10, the above pair of kingpin locking devices are spaced apart from each other and positioned to face each other, and each includes a cylinder body, a piston mounted within the cylinder body, and a piston rod connected to the piston, forming a lifting system. Claim 13 In claim 12, a lifting system configured such that a pair of piston rods included in the above pair of kingpin locking devices have one side having a groove structure and the other side having a projection structure to interlock with each other. Claim 14 In claim 7, the module lift is a lifting system further comprising a fall prevention device. Claim 15 In claim 14, the above-mentioned fall prevention device is a lifting system comprising a ratchet module installed on the multi-stage mast and a hydraulic device for fall prevention.

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