Method for lifting steel plate-concrete module

Abstract

The present invention relates to a method for lifting a steel plate-concrete module. The method comprises the steps of: horizontally arranging a guide frame positioned above a steel plate-concrete module, connected to the steel plate-concrete module by means of a plurality of first cables, and connected to a crane by means of second cables; preliminarily lifting the guide frame to measure tension of each of the plurality of first cables; identifying the center of gravity of the steel plate-concrete module on the basis of the measured tension; and changing a relative position of the guide frame and the crane according to the identified center of gravity and then performing an actual lifting operation.

Description

Lifting method for steel plate-concrete modules

[0001] The present invention relates to a lifting method for safely lifting heavy steel plate-concrete modules.

[0002] Steel Plate Concrete (SC) structures are a structural method that simply replaces the complex rebar and formwork of conventional reinforced concrete structures with steel plates; it involves manufacturing SC modules in advance at a factory and assembling and constructing them on-site.

[0003] To transport and install large SC structural modules assembled at the on-site factory, it is necessary to lift and move the heavy SC modules using a large crane.

[0004] However, since SC structural modules are hollow before concrete pouring, deformation may occur due to unbalanced loads during lifting and transportation; therefore, a lifting method is required to prevent this.

[0005] Therefore, the objective of the present invention is to provide a lifting method for safely lifting heavy steel plate-concrete modules.

[0006] The objective of the present invention is achieved by a method for lifting a steel plate-concrete module comprising: a step of horizontally positioning a guide frame located above the steel plate-concrete module, connected to the steel plate-concrete module by a plurality of first cables, and connected to a crane through a second cable; a step of pre-lifting the guide frame to measure the tension of each of the plurality of first cables; a step of determining the center of gravity of the steel plate-concrete module based on the measured tension; and a step of changing the relative position of the guide frame and the crane according to the determined center of gravity and performing the final lifting.

[0007] The above second cables are provided in multiple numbers, and the second cables are connected to the crane through a cable length adjustment unit, and the relative position between the guide frame and the crane can be achieved by adjusting the length of each second cable through the cable length adjustment unit.

[0008] The guide frame comprises: a frame body; a rail coupled to the upper part of the frame body; and a moving unit coupled to the rail so as to be movable along the rail and connected to the second cable, and the relative position between the guide frame and the crane can be achieved by moving the moving unit.

[0009] The above steel plate-concrete module comprises: a first steel plate and a second steel plate facing each other with a receiving space in between; a steam outlet formed in the first steel plate and the second steel plate; and a first lifting lug connected to the first steel plate and the second steel plate using a connecting bolt through the steam outlet, wherein a plurality of first cables may be connected to the first lifting lug.

[0010] The first lifting lugs are provided in plurality, and each first lifting lug comprises: a first part connected to the first steel plate and extending in a vertical direction; a second part facing the first part, connected to the second steel plate and extending in a vertical direction; a third part located outside the receiving space, connected to the first part and the second part and arranged in a horizontal direction; and a first connecting ring connected to the third part, and the plurality of first cables may be connected to each of the first connecting rings.

[0011] The above steel plate-concrete module comprises: a first steel plate and a second steel plate facing each other with a receiving space in between; a tie bar connecting the first steel plate and the second steel plate, at least a portion of which is positioned horizontally within the receiving space; and a plurality of second lifting lugs connected to the tie bar, wherein a plurality of first cables may be connected to each of the second lifting lugs.

[0012] The above tie bar includes a first protrusion protruding to the outside of the first steel plate; and a second protrusion protruding to the outside of the second steel plate, and the second lifting lug may be connected to the first protrusion and the second protrusion and coupled to the first steel plate and the second steel plate.

[0013] The second lifting lug comprises a plate-shaped lug body extending in a horizontal direction; and a second connecting ring coupled to the lug body, wherein the plurality of first cables may be connected to each of the second connecting rings.

[0014] According to the present invention, a lifting method for safely lifting a heavy steel plate-concrete module is provided.

[0015] FIG. 1 is a flowchart of a lifting method for a steel plate-concrete module according to a first embodiment of the present invention, and

[0016] FIG. 2 is a perspective view showing the positional relationship between a steel plate-concrete module, a guide frame, and a cable in a first embodiment of the present invention, and

[0017] FIGS. 3 and 4 illustrate the change in the relative position of the crane and the steel plate-concrete module in the first embodiment of the present invention, and

[0018] FIGS. 5 to 7 show a first lifting rug in a first embodiment of the present invention, and

[0019] FIGS. 8 and 9 illustrate a change in the relative position of a crane and a steel plate-concrete module in a second embodiment of the present invention, and

[0020] FIGS. 10 to 11 show a second lifting rug in a second embodiment of the present invention.

[0021] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0022] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0023] In addition, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is illustrated.

[0024] A lifting method according to the first embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

[0025] FIG. 1 is a flowchart of a lifting method for a steel plate-concrete module according to a first embodiment of the present invention, FIG. 2 is a perspective view showing the positional relationship between the steel plate-concrete module, the guide frame, and the cable in the first embodiment of the present invention, FIG. 3 and FIG. 4 show the change in the relative position between the crane and the steel plate-concrete module in the first embodiment of the present invention, and FIG. 5 to 7 show the first lifting lug in the first embodiment of the present invention.

[0026] First, place the guide frame and connect the cable (S100).

[0027] As shown in FIG. 2, a guide frame is placed on top of a steel plate-concrete module. The guide frame may correspond to the shape of the upper surface of the steel plate-concrete module to be lifted, but is not limited thereto. The guide frame may be made of a steel structure or the like, and may be in a grid shape as shown in FIG. 2. In other embodiments, the guide frame may be various, such as a straight type or a ladder type, and may have various shapes through assembly and disassembly.

[0028] A plurality of first cables are connected between the steel plate-concrete module and the guide frame. A crane for lifting (not shown) is connected to the guide frame via a second cable. More specifically, as shown in FIGS. 3 and 4, the second cable is connected to a cable length adjustment unit, and the crane can be connected to a hook of the cable length adjustment unit.

[0029] Next, the center of gravity is determined through preliminary lifting (S200).

[0030] In preliminary lifting, a crane is used to separate the entire steel plate-concrete module from the ground, and the separation distance is minimized. As shown in FIGS. 3 and 4, the guide frame is provided with a tension measuring part capable of measuring the tension of each first cable.

[0031] When preliminary lifting is performed, the tension of each first cable, that is, the load burden of each first cable, can be measured through the tension measuring unit. The center of gravity of the steel plate-concrete module is calculated using the measured tension data for each first cable. This process can be performed using a computer and communication equipment. To this end, the tension data transmitted by the tension measuring unit includes identification information of the corresponding tension measuring unit (location information, coordinate information, or serial number of the tension measuring unit, etc.).

[0032] Through this process, the center of gravity is determined as shown in Fig. 3.

[0033] Afterward, the relative position of the guide frame and the crane is changed according to the identified center of gravity (S300).

[0034] Once the center of gravity located on the left side of the steel plate-concrete module is identified as in Fig. 3, the relative position of the guide frame and the crane is changed to match the identified center of gravity as in Fig. 4.

[0035] The change in relative position can be performed by adjusting the length of each second cable using a cable length adjustment unit.

[0036] That is, the crane hook position is calculated such that the rotational moment for the entire vertical cable load becomes zero, and the crane length of the second cable is adjusted to maintain the horizontal alignment of the steel plate-concrete module during lifting.

[0037] Finally, the steel plate-concrete module is moved to the desired location using the self-amount (S400).

[0038] Since the main lifting is performed from the center of gravity of the steel-concrete module, the lifting is carried out stably, and deformation of the steel-concrete module is minimized.

[0039] The lifting method according to the first embodiment described above requires a plurality of second cables, and since a majority of the second cables are in an inclined state, it can be applied in an external environment where there are preferably no interfering structures on the upper part of the guide frame or in an indoor environment with a high floor height.

[0040] In the above lifting method, the first cable is connected to the first lifting lug of the steel plate-concrete module.

[0041] Hereinafter, the first lifting rug will be described with reference to FIGS. 5 to 7. FIG. 5 is a side view of the first lifting rug, FIG. 6 is a top view of the first lifting rug, and FIG. 7 is a cross-section of the first lifting rug.

[0042] The first lifting lug is integrally connected to the steel plate-concrete module.

[0043] The steel plate-concrete module includes a first steel plate and a second steel plate that face each other and form an accommodating space (future, a concrete pouring space).

[0044] Each steel plate has studs extending into a receiving space, and each steel plate has steam vents installed at regular intervals to minimize the effect of pressure acting on the steel plate due to moisture evaporation from the concrete in the event of a fire. The steam vents may be formed in a matrix shape as shown in Fig. 5. In addition, tie bars connect the two steel plates.

[0045] The first lifting lug includes a first part and a second part connected to a steam outlet via a connecting bolt. The first part and the second part are located within the receiving space, extend vertically, and are in close contact with each steel plate. The first part and the second part may each be connected to a plurality of steam outlets.

[0046] The third part is provided in the form of a long flat plate outside the receiving space, and a first connecting ring is provided on the upper part. The first cable is connected to the first connecting ring. The third part is connected to the first and second parts through reinforcing members and bolt connections, etc.

[0047] The first lifting lug can be removed from the steel plate-concrete module once the lifting is completed.

[0048] Hereinafter, a lifting method according to a second embodiment of the present invention will be described with reference to FIGS. 8 to 11.

[0049] FIGS. 8 and 9 show a change in the relative position of the crane and the steel plate-concrete module in the second embodiment of the present invention, and FIGS. 10 to 11 show a second lifting lug in the second embodiment of the present invention.

[0050] In the second embodiment, the guide frame includes a frame body, a rail, and a moving unit as shown in FIGS. 8 and 9.

[0051] The rail is fixed to the upper part of the frame body through bolt connections, etc., and extends long in one direction.

[0052] The movable unit can move along the rails and be fixed at a desired position. The second cable is connected to the movable unit. Once the center of gravity is determined through a preliminary lifting, the movable unit is moved along the rails so that the crane lifts the steel plate-concrete module at the center of gravity.

[0053] FIGS. 8 and 9 are conceptual diagrams of a 1-axis asymmetric module, and when the steel plate-concrete module is 2-axis asymmetric, the rail can be installed in two directions.

[0054] In the second embodiment, the first cable is connected to the second lifting lug. FIG. 10, which shows the second lifting lug, is a view of the second lifting lug from above, and FIG. 11 shows a cross-section of the second lifting lug.

[0055] The second lifting lug is coupled to a tie bar connecting the first steel plate and the second steel plate. In the second embodiment, the tie bar protrudes outside the receiving space to form a first protrusion and a second protrusion. The second lifting lug includes a plate-shaped lug body, and the lug body is positioned parallel to the outside of the receiving space. The lug body also protrudes outside the receiving space, and the lug body is coupled to the protrusion of the tie bar.

[0056] A second connecting ring is located on the upper part of the lug body, and the first cable is connected to the second connecting ring.

[0057] The second lifting lug can be removed from the steel plate-concrete module once the lifting is completed.

[0058] Since the lifting method according to the second embodiment does not have an inclined cable among the second cables, it can be applied even in indoor environments where there is an interfering structure on the upper part of the guide frame or where the floor height is not high.

[0059] The shape of the lifting lug according to the first and second embodiments described above can be selected depending on whether the steam exhaust hole and tie bar are arranged at the first cable connection location, etc.

[0060] Large steel plate-concrete modules are vulnerable to lateral deformation caused by horizontal loads when lifted by conventional methods. In order to prevent this, the present invention uses a guard frame in the middle to prevent horizontal loads and lateral deformation.

[0061] In the case of irregular and complex modules, it is difficult to calculate the center of gravity for maintaining the horizontal balance of the structure, so measures such as lifting analysis must be performed in advance. In this invention, a cable tension and coordinate recognition device is installed on the upper part of the first cable to automatically calculate the center of gravity without prior analysis measures, and the crane moves to the center of gravity point by reflecting this.

[0062] Through the present invention, on-site construction, such as lifting and moving large steel plate-concrete modules, can be performed safely and quickly, thereby contributing to shortened construction time and improved constructability through increased work efficiency.

[0063] The aforementioned embodiments are examples for explaining the present invention, and the present invention is not limited thereto. Since a person skilled in the art to which the present invention pertains can implement the present invention by making various modifications therefrom, the technical scope of protection of the present invention should be determined by the appended claims.

Claims

1. In a lifting method for a steel plate-concrete module, A step of horizontally arranging a guide frame located on the upper part of the steel plate-concrete module, connected to the steel plate-concrete module by a plurality of first cables, and connected to a crane through a second cable; A step of pre-lifting the guide frame and measuring the tension of each of the plurality of first cables; A step of determining the center of gravity of the steel plate-concrete module based on the measured tension; and A lifting method comprising the step of changing the relative position of the guide frame and the crane according to the identified center of gravity and lifting.

2. In Paragraph 1, The above second cable is provided in multiple numbers, and The second cable is connected to the crane through a cable length adjustment unit, and A lifting method in which the relative position between the guide frame and the crane is achieved by adjusting the length of each second cable through a cable length adjustment unit.

3. In Paragraph 1, The above guide frame is, Frame body; A rail coupled to the upper part of the above-mentioned frame body; and It includes a moving unit coupled to the rail so as to be movable along the rail and connected to the second cable, The relative position between the guide frame and the crane is achieved by moving the moving unit.

4. In Paragraph 3, The above steel plate-concrete module is, A first steel plate and a second steel plate facing each other with a receiving space in between; Steam outlets formed in the first and second steel plates; It includes a first lifting lug connected to the first steel plate and the second steel plate using a connecting bolt through the steam outlet, and A method in which a plurality of first cables are connected to the first lifting lug.

5. In Paragraph 4, The above-mentioned first lifting rug is provided in multiple numbers, and Each of the above first lifting rugs is, A first part connected to the first steel plate and extending in a vertical direction; A second part facing the first part, coupled to the second steel plate, and extending in a vertical direction; and A third part located outside the above-mentioned receiving space, combined with the first part and the second part, and arranged in a horizontal direction; and It includes a first connecting ring coupled to the third part above, A method in which the plurality of first cables are connected to each of the first coupling rings.

6. In Paragraph 3, The above steel plate-concrete module is, A first steel plate and a second steel plate facing each other with a receiving space in between; A tie bar connecting the first steel plate and the second steel plate, with at least a portion of which is positioned horizontally within the above-mentioned receiving space; and It includes a plurality of second lifting lugs connected to the above tie bar, A method in which a plurality of first cables are connected to each of the second lifting lugs.

7. In Paragraph 6, The above tie bar is, A first protrusion protruding to the outside of the first steel plate; and It includes a second protrusion protruding outward from the second steel plate, The above second lifting lug is connected to the above first protrusion and the above second protrusion and is coupled to the above first steel plate and the above second steel plate.

8. In Paragraph 7, The above-mentioned second lifting rug is, A plate-shaped lug body extending in the horizontal direction; and It includes a second connecting ring coupled to the above lug body, A method in which the plurality of first cables are connected to each of the second connecting rings.

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