Pre-assembly and storage method for rebar units
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TAKENAKA CORP
- Filing Date
- 2022-12-15
- Publication Date
- 2026-07-30
Smart Images
Figure 0007897786000001 
Figure 0007897786000002 
Figure 0007897786000003
Abstract
Description
Technical Field
[0001] The present invention relates to a method for prefabricating and storing a reinforcing bar unit by using a plurality of prefabrication gantries for prefabricating and storing the reinforcing bar unit.
Background Art
[0002] As the background art of the present invention, for example, in the method of field-assembling column bars by assembling column bars at a position other than the original reinforcement position, a pair of reinforcing bar assembly gantries arranged at regular intervals and a plurality of stages of scissors detachably pin-connected to the columns of the reinforcing bar assembly gantries are provided. For each reinforcing bar assembly gantry, a predetermined number of main bars are arranged on the scissors in order from the lower stage while attaching the scissors, and after arranging a large number of main bars vertically and horizontally at a predetermined pitch, a plurality of hoop bars are arranged at predetermined positions of the arranged main bars to field-assemble column bars (reinforcing bar units). After reinforcing the field-assembled column bars with a reinforcing jig, there is a technique of lifting and placing them at the erection position (see, for example, Patent Document 1).
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] The field-assembling method described in Patent Document 1 uses the pair of reinforcing bar assembly gantries and the plurality of stages of scissors described above to enable efficient field-assembly of column bars (reinforcing bar units) by making it easier to arrange each main bar at a predetermined vertical and horizontal position. In addition, since the field-assembled column bars are lifted and placed at the erection position each time, no consideration is given to the storage of the field-assembled column bars.
[0005] Incidentally, when pre-assembling reinforcing bar units, it is generally considered that an assembly yard and a stockyard should be secured on the construction site premises, and the reinforcing bar units assembled in the assembly yard should be sequentially stored in the stockyard, thereby enabling the efficient pre-assembly and storage of as many reinforcing bar units as possible.
[0006] However, if a construction site is a small plot of land where it is difficult to secure an assembly yard and a stockyard on the premises, even if pre-assembly of rebar units can be done, the number of rebar units that can be stored will be limited, making it difficult to efficiently pre-assemble and store many rebar units one after another.
[0007] Therefore, there is room for improvement in terms of improving constructability when building structures that use many reinforcing bar units on a small plot of land.
[0008] In light of this situation, the main objective of the present invention is to improve the constructability of buildings constructed using many reinforcing bar units by enabling efficient pre-assembly and rational storage of many reinforcing bar units even in confined spaces. [Means for solving the problem]
[0009] The first characteristic configuration of the present invention is a method for pre-assembling and storing reinforcing bar units using a plurality of pre-assembly frames, The aforementioned pre-assembly frame is provided with a plurality of reinforcing bar support members that are detachably attached to a plurality of mounting sections provided at a constant pitch in the vertical direction on a pair of left and right support members. The method involves performing, in order from the lowest mounting section, a rebar support member attachment step of attaching the rebar support member to the mounting section at the same height for a plurality of pre-assembly frames arranged in a row at a predetermined pitch, and a rebar unit pre-assembly step of pre-assembling the rebar unit by arranging a predetermined number of rebars at a predetermined pitch on the rebar support member at the same height and connecting the rebars with a plurality of rebar connecting members, thereby pre-assembling a plurality of rebar units in a stacked manner on a plurality of pre-assembly frames, and storing them in a way that allows them to be removed sequentially from the top rebar unit.
[0010] According to this configuration, if several relatively narrow work areas can be secured, large enough to lay one rebar unit flat, multiple pre-assembly frames can be arranged in a line at a predetermined pitch in each work area. Then, the rebar support member attachment process and the rebar unit pre-assembly process can be performed on the multiple pre-assembly frames in order from the bottom, allowing multiple rebar units to be stored in a stacked state in each work area, pre-assembled sequentially from the bottom of the pre-assembly frames. This makes it possible to rationally pre-assemble and store many rebar units even in confined spaces. Furthermore, when using the stored rebar units, they can be removed sequentially starting from the top unit. This means that, for example, if each rebar unit is pre-assembled and stored in reverse order of its installation sequence, each rebar unit can be smoothly removed according to its installation sequence. As a result, even in confined spaces, it becomes possible to efficiently pre-assemble and rationally store a large number of reinforcing bar units, thereby improving the constructability of buildings that use many reinforcing bar units.
[0011] A second characteristic feature of the present invention is that, after completing the pre-assembly process of the reinforcing bar units at any stage other than the top, a scaffolding board placement process is included, in which scaffolding boards are placed on the reinforcing bar units that were pre-assembled in the pre-assembly process of the reinforcing bar units.
[0012] In this configuration, as the reinforcing bar units are assembled sequentially from the bottom up on the pre-assembly frame, scaffolding boards are placed on top of the assembled reinforcing bar units, creating a stable platform that makes it easier to maintain balance. This allows for a stable working posture when performing the reinforcing bar support member installation process and the reinforcing bar unit pre-assembly process on the upper side of the pre-assembly frame, enabling efficient and stable work while installing the reinforcing bar support members and pre-assembling the reinforcing bar units on the upper side. As a result, the ease of construction can be improved when pre-assembling the reinforcing bar units in order from the bottom of the pre-assembly frame.
[0013] A third characteristic configuration of the present invention is that the upper end of the support member in the pre-assembly frame is provided with a lifting sling, The aforementioned pre-assembly frame is equipped with connecting members that enable the frame to be integrally connected by frame connecting members when the pre-assembly frames are arranged in a line at a predetermined pitch.
[0014] With this configuration, when moving multiple rebar units that have been pre-assembled and stored in multiple layers using multiple pre-assembly frames, it becomes possible to unitize multiple pre-assembly frames arranged in a line at a predetermined pitch by connecting them with frame connecting members. By unitizing multiple pre-assembly frames in this way, each pre-assembly frame can be attached to a lifting machine such as a crane using the lifting sling section provided on each frame. This allows the lifting machine to then lift and move the multiple rebar units, which are stacked in multiple layers on the multiple pre-assembly frames and stored, all at once to a trailer or a temporary storage location close to the installation location of the rebar units. Furthermore, by enabling this type of lifting and moving, if each reinforcing bar unit is pre-assembled and stored on multiple pre-assembly frames, calculated backward from their installation order, then at the destination, each reinforcing bar unit can be smoothly retrieved according to its installation order. As a result, when the work area for pre-assembling the reinforcing bar units is separated from the installation position of the reinforcing bar units and it is necessary to move a plurality of reinforcing bar units to a temporary placement position near the installation position using a crane or a trailer, etc., the movement and the installation of each reinforcing bar unit after the movement can be efficiently performed.
[0015] The fourth characteristic configuration of the present invention lies in that the pre-assembly gantry is provided with stacking placement portions that enable stacking placement in the vertical direction in a state where a plurality of them are connected by the gantry connecting members to form a unit.
[0016] According to this configuration, it becomes possible to store the pre-assembly gantry in a state where a plurality of reinforcing bar units are stacked in multiple stages in the vertical direction, with a plurality of pre-assembly gantries in a state where they are stacked in multiple stages in the vertical direction and stored. As a result, even in a narrow area, it becomes possible to efficiently pre-assemble and rationally store more reinforcing bar units, and it is possible to more effectively improve the workability of a building constructed using a large number of reinforcing bar units.
Brief Description of the Drawings
[0017] [Figure 1] Schematic plan view showing the pre-assembly gantry installation process, etc. in the assembly yard of the reinforcing bar unit [Figure 2] Plan view showing the configuration of the pre-assembly gantry [Figure 3] Front view showing the configuration of the pre-assembly gantry with the reinforcing bar support members attached [Figure 4] Side view showing the configuration of the pre-assembly gantry [Figure 5] Vertical cross-sectional front view of the pre-assembly gantry showing the reinforcing bar support member attachment process [Figure 6] Front view of the pre-assembly gantry showing the reinforcing bar unit pre-assembly process [Figure 7] Main part side view of the pre-assembly gantry showing the reinforcing bar unit pre-assembly process in a state where the scaffolding board is placed on the reinforcing bar unit during the scaffolding board placement process [Figure 8] Side view showing the storage state of the reinforcing bar units pre-assembled using the pre-assembly gantry [Figure 9]Side view of the main part showing the storage state of the reinforcing bar unit with the pre-assembly stands stacked vertically [Figure 10] Flowchart showing the working process in the pre-assembly and storage method of the reinforcing bar unit [Figure 11] Side view (a) and plan view (b) showing the lifting process of lifting the reinforcing bar unit together with the pre-assembly stand [Figure 12] Front view showing the lifting process of removing the reinforcing bar unit from the pre-assembly stand and lifting it [Figure 13] Side view showing the lifting process of removing the reinforcing bar unit from the pre-assembly stand and lifting it[[ID=1"]] [Figure 14] Front view of the main part showing the installation process of the reinforcing bar unit [Figure 15] Front view of the pre-assembly stand showing the process of removing the reinforcing bar support member
Embodiment for Carrying out the Invention
[0018] Hereinafter, as an example of an embodiment for carrying out the present invention, an embodiment in which the pre-assembly and storage method of the reinforcing bar unit according to the present invention is applied to the pre-assembly and storage of a longitudinal bar unit, which is an example of the reinforcing bar unit used for the wall reinforcing bars of a reinforced concrete wall in a building constructed using many reinforcing bar units, will be described based on the drawings. In addition, the pre-assembly and storage method of the reinforcing bar unit according to the present invention can be applied to the pre-assembly and storage of, for example, a transverse bar unit, which is an example of the reinforcing bar unit used for wall reinforcing bars, or a beam bar unit, which is an example of the reinforcing bar unit used for the beam reinforcing bars of a reinforced concrete beam, in addition to the above longitudinal bar unit.
[0019] The construction site of the building exemplified in this embodiment is a narrow site where it is difficult to secure an assembly yard and a stock yard for the longitudinal bar units within the site. Therefore, within the site of the construction site, as shown in FIG. 1, an assembly yard Y for the longitudinal bar unit U, which also serves as a stock yard for the longitudinal bar unit U, which is an example of the reinforcing bar unit, is secured. In the assembly yard Y, several relatively narrow working areas A where one longitudinal bar unit U can be placed flat are secured.
[0020] In each work area A, four pre-assembly frames 10 are arranged in a line at a predetermined pitch. In other words, this embodiment illustrates a method of pre-assembling and storing reinforcing bar units, in which four pre-assembly frames 10 are used to pre-assemble and store the vertical reinforcement units U. Furthermore, as a method for pre-assembling and storing the reinforcing bar units, it is also possible to pre-assemble and store the vertical reinforcing bar units U using multiple pre-assembly frames 10, such as 3 or 5 frames, instead of 4 frames.
[0021] As shown in Figures 2 to 8, each pre-assembly frame 10 is constructed by welding together a pair of left and right support members 11 facing each other at a constant pitch, a first frame member 12 installed between the lower ends of the support members 11, four overhanging members 13 extending forward or backward from the lower ends of the support members 11, four second frame members 14 installed across the first frame member 12 and the overhanging members 13, and four rib plates 15 extending across the support members 11 and the overhanging members 13.
[0022] As shown in Figures 3-5, each pre-assembly frame 10 is equipped with multiple rebar support members 16 that are detachably attached to multiple mounting sections 11a provided at a constant pitch in the vertical direction on a pair of left and right support members 11. Each rebar support member 16 is made of a circular steel pipe, and retaining pieces 16a that protrude from the same position in the same direction in the circumferential direction are welded to both ends of each member. Furthermore, instead of having retaining pieces 16a welded to both ends of the reinforcing bar support members 16, they may also have through holes formed at both ends for inserting and removing retaining pins.
[0023] As shown in Figures 2-7, channel steel is used for each support member 11 of each pre-assembly frame 10, and a pair of left and right support members 11 are arranged so that their webs 11A face each other. The web 11A of each support member 11 is provided with five keyhole-shaped through holes 11a at a constant pitch in the vertical direction, which serve as multiple mounting sections 11a, allowing the aforementioned rebar support members 16 to be inserted and removed. The upper end of the web 11A of each support member 11 is provided with a single circular through hole 11b, which serves as a lifting rigging section. Furthermore, instead of channel steel, the support member 11 can be made of, for example, H-beams or angle steel. Also, as the mounting section 11a for multiple stages, it can be made of, for example, multiple through holes 11a other than the five, arranged at a constant pitch in the vertical direction, or, instead of multiple through holes 11a, it can be made of, for example, multiple hook members arranged at a constant pitch in the vertical direction.
[0024] As shown in Figures 2 and 4, channel steel is used for the first erection member 12 of each pre-assembly frame 10, and the first erection member 12 is provided on each pre-assembly frame 10 with both ends passing through the web 11A of the support member 11. As shown in Figures 4 and 7, connecting members 17 are provided at both the left and right ends of the first erection member 12, enabling the four pre-assembly frames 10 to be connected integrally by the left and right frame connecting members 20 when they are arranged in a line at a predetermined pitch. The left and right frame connecting members 20 are made of circular steel pipes that have a length spanning the four pre-assembly frames 10, and the left and right connecting members 17 are equipped with catch clamps or the like that enable the connection between the first erection member 12 and the frame connecting members 20. Furthermore, instead of channel steel, the first erection member 12 can be replaced with, for example, H-beams or angle steels.
[0025] As shown in Figures 2-4, channel steel is used for each cantilever member 13 of each pre-assembly frame 10, and one end of each cantilever member 13 is welded to the lower end of the flange 11B of the support member 11. Angle steel is used for each second erection member 14 of each pre-assembly frame 10, and each second erection member 14 is erected on the first erection member 12 and the cantilever member 13, thereby restraining their horizontal displacement. Furthermore, instead of channel steel, H-beams or angle steel can be used for the cantilevered member 13. Instead of angle steel, channel steel can be used for the second erection member 14.
[0026] As shown in Figures 2-4 and 9, each pre-assembly frame 10 is equipped with a stacking section 18 that allows for the vertical stacking of four pre-assembly frames 10 in a unitized state, connected by left and right frame connecting members. The stacking section 18 consists of the upper and lower ends of each support member 11 and a pair of engaging sections 18A that protrude upward from the upper end of each support member 11. The pair of engaging sections 18A are made of round steel bar material and are welded to a pair of corners in the grooves of each support member 11. As shown in Figure 9, when the unitized pre-assembly frames 10 are stacked vertically, each engaging portion 18A provided on the lower pre-assembly frame 10 fits into the gap between the support member 11 and the first erection member 12 within the groove of each support member 11 provided on the upper pre-assembly frame 10, thereby preventing misalignment of the upper pre-assembly frame 10 relative to the lower pre-assembly frame 10.
[0027] The pre-assembly and storage method for reinforcing bar units illustrated in this embodiment includes, as shown in the flowchart of Figure 10, a first step S1 which is the installation of a pre-assembly frame (see Figure 1), a second step S2 which is the installation of reinforcing bar support members (see Figure 5), and a third step S3 which is the pre-assembly of reinforcing bar units (see Figures 1, 6-8).
[0028] In the first step S1, the pre-assembly frame installation step, as shown in Figure 1, four pre-assembly frames 10 are arranged in a line at a predetermined pitch in each work area A secured in the assembly yard Y. Specifically, in each work area A, the four pre-assembly frames 10 are arranged in a line at a predetermined pitch in the front-to-back direction of the pre-assembly frames 10, which corresponds to the length direction of the vertical reinforcement (an example of reinforcing bars) 1. Then, using the left and right connecting members 17 provided on each pre-assembly frame 10, the four pre-assembly frames 10 arranged in a line at a predetermined pitch are connected by the left and right frame connecting members 20 (see Figure 8). This allows the four pre-assembly frames 10 to be kept as a unit. Furthermore, the spacing of each pre-assembly frame 10 in each work area A is appropriately changed according to the height of the reinforced concrete wall that uses the vertical reinforcement unit U pre-assembled using the pre-assembly frame 10 in work area A as wall reinforcement, as well as the position and size of the openings provided in the reinforced concrete wall.
[0029] In the second step S2, the reinforcement support member installation step, as shown in Figures 5 to 8, reinforcement support members 16 are attached to the same height through-holes (mounting parts) 11a of four pre-assembly frames 10 arranged in a line at a predetermined pitch in each work area A. Specifically, when the pre-assembly of the vertical reinforcement unit U using each pre-assembly frame 10 in the work area A is being performed for the first time, the reinforcement support member 16 is inserted through the lowest through-hole 11a of the five through-holes 11a provided in the left and right support members 11 of each pre-assembly frame 10, and the reinforcement support member 16 is attached to the lowest position of each pre-assembly frame 10. When the pre-assembly of the vertical reinforcement unit U is being performed for the second time or later, the reinforcement support member 16 is inserted through the lowest through-hole 11a of the unused through-holes 11a in the left and right support members 11, and the reinforcement support member 16 is attached to the lowest unused position of each pre-assembly frame 10. Each reinforcing bar support member 16 is inserted through the through-hole 11a of each pre-assembly frame 10 with the retaining pieces 16a provided at both ends facing upwards. Then, the retaining pieces 16a rotate under their own weight so that they face downwards, thereby preventing them from coming out of the through-hole 11a of each pre-assembly frame 10.
[0030] In the third step S3, the rebar unit pre-assembly process, as shown in Figures 1 and 6-8, a predetermined number of vertical reinforcing bars (an example of reinforcing bars) 1 are placed at predetermined intervals on rebar support members 16 of the same height that were attached to each pre-assembly frame 10 in the rebar support member installation process, and these vertical reinforcing bars 1 are connected with multiple rebar connecting members 2 to pre-assemble the vertical reinforcing bar unit U. Angle steel is used for the rebar connecting members 2, and each predetermined position of the rebar connecting member 2 has a pair of through holes (not shown) that allow the vertical reinforcing bars 1 placed at predetermined intervals on the rebar support members 16 to be fixed with U-bolts 3 and nuts 4. Furthermore, the number, length, and spacing of the vertical reinforcements 1 arranged on the reinforcement support member 16, the number, length, and arrangement of the reinforcement connecting members 2, and the arrangement and number of through holes are appropriately changed according to the width dimension of the vertical reinforcement unit U pre-assembled on the reinforcement support member 16, and the position and size of the openings provided in the reinforced concrete wall where the vertical reinforcement unit U is used as wall reinforcement. Instead of angle steel, flat bars or channel steel can be used for the reinforcement connecting members 2.
[0031] In other words, in the pre-assembly and storage method for reinforcing bar units illustrated in this embodiment, as shown in Figure 1, a pre-assembly frame installation step is performed in which four pre-assembly frames 10 are arranged in a line at a predetermined pitch in each work area A. Then, as shown in Figures 5 to 8, a reinforcing bar support member installation step is performed in which reinforcing bar support members 16 are attached to through holes 11a of the same height on the four pre-assembly frames 10 arranged in a line at a predetermined pitch, and a reinforcing bar unit pre-assembly step is performed in which a predetermined number of vertical bars 1 are placed on the reinforcing bar support members 16 of the same height at a predetermined pitch, and these vertical bars 1 are connected with multiple reinforcing bar connecting members 2 to pre-assemble the vertical bar unit U. This is done sequentially from the lowest through hole 11a, so that five vertical bar unit U are pre-assembled on the four pre-assembly frames 10 in a stacked state of five layers, and the vertical bar unit U can be stored so that it can be removed sequentially from the top vertical bar unit U.
[0032] As shown in the flowchart of Figure 10, the rebar unit pre-assembly process includes a scaffolding board placement process in which, after completing the rebar unit pre-assembly process for all but the topmost rebar unit, a scaffolding board 21 (see Figure 7) is placed on the vertical rebar unit U that was pre-assembled in the rebar unit pre-assembly process, in order to facilitate the next rebar unit pre-assembly process. The scaffolding board 21 is made of multiple steel wires forming a mesh plate, which ensures high strength while reducing weight, making it easy to carry and place on the vertical rebar unit U. In this embodiment, the scaffolding board placement process is exemplified as being included in the rebar unit pre-assembly process. However, the scaffolding board placement process may also be included in the rebar support member installation process so that the scaffolding boards 21 are placed on the vertical rebar units U pre-assembled in the rebar unit pre-assembly process, before starting the rebar support member installation process for all levels except the lowest level (after completing the rebar unit pre-assembly process for all levels except the highest level). The scaffolding boards 21 can be made of steel plate, expanded metal, or the like.
[0033] As described above, according to the pre-assembly and storage method for reinforcing bar units illustrated in this embodiment, if, for example, several relatively narrow work areas A can be secured on the construction site premises, large enough to lay one vertical reinforcing bar unit U flat, then after performing the pre-assembly frame installation process described above, the reinforcing bar support member attachment process and the reinforcing bar unit pre-assembly process described above can be performed on the four pre-assembly frames 10 placed in each work area A, starting from the bottom of each frame. This allows multiple vertical reinforcing bar units U to be pre-assembled in each work area A, starting from the bottom of the pre-assembly frame 10, and stored in a stack of five layers. This makes it possible to rationally pre-assemble and store many vertical reinforcing bar units U even in a confined space.
[0034] Furthermore, when using the stored vertical reinforcement units U, they can be removed sequentially starting from the top unit. This means that, for example, if each vertical reinforcement unit U is pre-assembled and stored in reverse order of its installation sequence, each vertical reinforcement unit U can be smoothly removed according to its installation sequence.
[0035] As a result, even in confined spaces, it becomes possible to efficiently pre-assemble and rationally store many vertical reinforcement units U, thereby improving the constructability of buildings constructed using many vertical reinforcement units U.
[0036] Furthermore, if multiple types of vertical reinforcement units U with different widths and reinforcement spacings are to be pre-assembled, a dedicated work area A may be provided for each type.
[0037] Furthermore, the pre-assembly and storage method for reinforcing bar units illustrated in this embodiment includes a scaffolding board placement step in which, after completing the pre-assembly process for reinforcing bar units other than the topmost one, a scaffolding board 21 is placed on the pre-assembled vertical reinforcing bar unit U. As the vertical reinforcing bar units U are pre-assembled sequentially from the bottommost one on each pre-assembly frame 10, a scaffolding board 21 is placed on the pre-assembled vertical reinforcing bar unit U, forming a stable platform. This allows for a stable working posture when performing the reinforcing bar support member installation process and the reinforcing bar unit pre-assembly process on the upper side of each pre-assembly frame 10, enabling efficient installation of each reinforcing bar support member 16 and pre-assembly of the vertical reinforcing bar unit U on the upper side in a stable working posture.
[0038] As a result, the workability can be improved when pre-assembling each pre-assembly frame 10, starting from the lowest vertical reinforcement unit U.
[0039] Next, based on Figures 11-15, we will describe the rebar unit installation work, in which the pre-assembled and stored vertical rebar units U, which were pre-assembled and stored in the assembly yard Y, are installed at a predetermined installation position Pa by applying the pre-assembly and storage method for rebar units exemplified in this embodiment.
[0040] In the building construction site illustrated in this embodiment, the assembly yard Y (see Figures 1 and 8) for the vertical reinforcement units U secured within the site and the installation location Pa (see Figure 14) for the vertical reinforcement units U are far apart. Therefore, in order to install each vertical reinforcement unit U, which has been pre-assembled and stored in the assembly yard Y, at the predetermined installation location Pa, it is necessary to transport the multiple vertical reinforcement units U that have been pre-assembled and stored in the assembly yard Y to a temporary storage location Pb (see Figures 11-13) near the installation location Pa using a lifting machine C1 (see Figure 1) such as a crane installed in the assembly yard Y or a trailer (not shown). Therefore, the rebar unit installation work illustrated in this embodiment includes a rebar unit removal process in which multiple vertical rebar units U, which have been pre-assembled and stored in the assembly yard Y, are transported to a temporary storage location Pb using a lifting machine C1 or trailer, and a rebar unit installation process in which the vertical rebar units U transported to the temporary storage location Pb are individually lifted using a lifting machine C2 such as a crane installed at the temporary storage location Pb and installed at a predetermined installation location Pa.
[0041] In carrying out the rebar unit removal process, in the pre-assembly and storage method of the rebar unit exemplified in this embodiment, as described above, each pre-assembly frame 10 is provided with a through hole 11b for lifting at the upper end of each support member 11. Furthermore, in the pre-assembly frame installation process of the first process S1, four pre-assembly frames 10 arranged in a line at a predetermined pitch are integrally connected to each other using the left and right connecting members 17 provided on them, and the left and right frame connecting members 20 to form a unit. As a result, in the rebar unit removal process, as shown in Figures 1 and 11, by using the lifting through holes 11b provided in each pre-assembly frame 10 to attach each pre-assembly frame 10 to the lifting device Ca of the lifting machine C1 via the first lifting device unit 30, the five vertical rebar units U, stacked in five layers on the four pre-assembly frames 10 and stored in that state, can be lifted and moved all at once by the lifting machine C1 to a trailer or temporary storage location Pb (not shown).
[0042] Furthermore, by enabling this type of lifting and moving, if each vertical reinforcement unit U is pre-assembled and stored on four pre-assembly frames 10, calculated backward from their installation order, then even after the four pre-assembly frames 10 are lifted and moved to the temporary storage position Pb, each vertical reinforcement unit U can be smoothly removed from the four pre-assembly frames 10 in accordance with their installation order.
[0043] As a result, when the assembly yard Y (see Figures 1 and 8) where the vertical reinforcement units U are pre-assembled is far from the installation location Pa (see Figure 14) of the vertical reinforcement units U, and it is necessary to move multiple vertical reinforcement units U to a temporary storage location Pb (see Figures 11-13) near the installation location Pa using a lifting machine C1 or trailer, the movement and installation of each vertical reinforcement unit U after the move can be carried out efficiently.
[0044] Furthermore, in the pre-assembly and storage method of reinforcing bar units illustrated in this embodiment, as described above, each pre-assembly frame 10 is equipped with a stacking section 18 that allows for the vertical stacking and storage of the frames in a unitized state by connecting them with frame connecting members 20. As shown in Figure 9, in each work area A, it becomes possible to store four pre-assembly frames 10, each containing five vertical reinforcing bar units U stacked in five layers, in a state where they are stacked in multiple layers in the vertical direction.
[0045] As a result, even in confined spaces, it becomes possible to efficiently pre-assemble and rationally store a larger number of vertical reinforcement units U, thereby more effectively improving the constructability of buildings constructed using many vertical reinforcement units U.
[0046] As shown in Figure 11, the first lifting device unit 30 includes a traverser 31 as a lifting jig to maintain the horizontal lifting position of the four unitized pre-assembly frames 10, two first wire ropes 32 to suspend and support the traverser 31 from the lifting device Ca of the lifting machine C1, and eight second wire ropes 33 to suspend and support each pre-assembly frame 10 from the traverser 31. The traverser 31 is constructed by joining a single first member 31A made of H-shaped steel with a length spanning the unitized pre-assembly frames 10, and a plurality of second members 31B made of H-shaped steel with a length approximately the same as the left-right width of each pre-assembly frame 10, such that each second member 31B corresponds to the spacing between the unitized pre-assembly frames 10. Both ends of the first member 31A are provided with first lifting parts 31a to be attached to the lifting device Ca of the lifting machine C1 via the first wire ropes 32. Each second member 31B is provided with a second lifting section 31b at both ends, which is attached via a second wire rope 33 to a lifting through hole 11b provided at the upper end of each support member 11 in the pre-assembly frame 10.
[0047] As shown in Figures 12-15, the rebar unit installation process includes a lifting process (see Figures 12-13) in which the uppermost rebar connecting member 2 of the multiple rebar connecting members 2 provided on the vertical rebar unit U in the installation position is rigged to the lifting device Cb of the lifting machine C2 via the second lifting device unit 40; a lifting process (see Figures 13-14) in which the rigged vertical rebar unit U is lifted by the lifting machine C2 and removed from the four pre-assembly frames 10 in the installation position, and the removed vertical rebar unit U is lifted and moved to a predetermined installation position Pa while maintaining the installation position; an installation process (see Figure 14) in which the vertical rebar unit U that has been lifted and moved to the installation position Pa is installed at the predetermined installation position Pa; and a rebar support member removal process (see Figure 15) in which the four rebar support members 16 that supported the removed vertical rebar unit U are removed from each pre-assembly frame 10, enabling the removal of the next vertical rebar unit U.
[0048] As shown in Figures 12-13, the second lifting unit 40 is equipped with a traverser 41 as a lifting jig to maintain the horizontal lifting position of the vertical reinforcement unit U, two first wire ropes 42 that suspend and support the traverser 41 from the lifting device Cb of the lifting machine C2, and two second wire ropes 43 that suspend and support the vertical reinforcement unit U from the traverser 41.
[0049] As shown in Figure 14, during the installation process, the upper end of one of the vertical bars 1 of the vertical reinforcement unit U, which has been lifted and moved to a predetermined installation position Pa by the lifting machine C2, is fixed to the vertical reinforcement unit support member 51 of the reinforcement support frame 50 that supports the vertical reinforcement unit U at the installation position Pa using U-bolts 52, nuts 53, etc. In addition, the lower end of each vertical bar 1 of the vertical reinforcement unit U is connected to a plurality of vertical bars 1 that have been previously installed at a predetermined pitch at the installation position Pa of the vertical reinforcement unit U via mechanical joints 5. For this reason, threaded reinforcing bars that can be connected by mechanical joints 5 are used for each vertical bar 1.
[0050] As shown in Figure 15, in the rebar support member removal process, each rebar support member 16 that supported the removed vertical rebar unit U is rotated until the retaining pieces 16a provided at both ends of the member face upward, thereby easily releasing the retaining pieces from the through holes 11a of each pre-assembly frame 10, and making it easy to remove each rebar support member 16 from each pre-assembly frame 10. [Explanation of symbols]
[0051] 1 Reinforcement bars 2. Reinforcement bar connecting member 10. Stand for pre-assembly 11 Support member 11a Mounting part 11b Lifting section 16 Reinforcement support member 17 Connecting member 18 Stacking and mounting section 20 Frame connecting members 21 scaffolding planks U-shaped rebar unit
Claims
1. A method for pre-assembling and storing reinforcing bar units, which involves using multiple pre-assembly frames to pre-assemble and store the reinforcing bar units, The aforementioned pre-assembly frame is provided with a plurality of reinforcing bar support members that are detachably attached to a plurality of mounting sections provided at a constant pitch in the vertical direction on a pair of left and right support members. A method for pre-assembling and storing reinforcing bars, comprising: a reinforcing bar support member attachment step of attaching the reinforcing bar support member to attachment parts of the same height on a plurality of pre-assembly frames arranged in a row at a predetermined pitch; and a reinforcing bar unit pre-assembly step of pre-assembling the reinforcing bar unit by arranging a predetermined number of reinforcing bars at a predetermined pitch on the reinforcing bar support members of the same height and connecting the reinforcing bars with a plurality of reinforcing bar connecting members, performed sequentially from the lowest attachment part, thereby pre-assembling a plurality of reinforcing bar units on a plurality of pre-assembly frames in a stacked state, and storing them in a way that allows them to be removed sequentially from the top reinforcing bar unit.
2. The method for pre-assembling and storing reinforcing bars according to claim 1, further comprising a scaffolding board placement step of placing scaffolding boards on the reinforcing bars pre-assembled in the reinforcing bar unit pre-assembly step after completing the pre-assembly step of the reinforcing bar unit at any stage other than the top stage.
3. The upper end of the support member in the aforementioned pre-assembly frame is provided with a lifting sling, The method for pre-assembling and storing reinforcing bar units according to claim 1 or 2, wherein the pre-assembly frame is provided with a connecting member that enables integral connection by frame connecting members when the pre-assembly frames are arranged in a line at a predetermined pitch.
4. The method for pre-assembling and storing reinforcing bar units according to claim 3, wherein the pre-assembly frame is provided with a stacking section that allows for stacking and placing multiple frames together in a unitized state using the frame connecting members.