Method for constructing reinforcing bar units for reinforced concrete members

Abstract

To improve the workability and shorten the construction period in constructing a reinforcing unit.SOLUTION: There is provided a method for constructing a reinforcement unit for reinforcing concrete members for constructing a reinforcing unit by arranging a large number of reinforcing bars 10, including: a reinforcing panel basic assembly process of arranging main reinforcing bars 11 and 12 and a core reinforcing bar 13 of one row among a large number of reinforcing bars 10 at predetermined vertical and horizontal positions, and basically assembling a reinforcing panel; and a reinforcing bar unit manufacturing process of manufacturing a reinforcing bar unit by arranging a predetermined number of reinforcing panels in a member width direction in an upright posture in which the main bars 11 and 12 are aligned in a vertical direction. The reinforcing panel basic assembly process includes: a main bar flat-placing process of flatly placing the main reinforcing bars 11 and 12 of one row in parallel to each other on a frame 4; a core reinforcing bar arranging process of arranging the core reinforcing bars 13 of one row at predetermined positions on the main reinforcing bars 11 and 12 in a posture that intersects the main reinforcing bars 11 and 12; and a reinforcing panel manufacturing process of manufacturing a reinforcing panel by assembling the main reinforcing bars 11 and 12 and the core reinforcing bar 13 on the frame 4.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for constructing a reinforcing bar unit for a reinforced concrete member, in which a large number of reinforcing bars are arranged to construct a reinforcing bar unit. [Background technology]

[0002] As background art for the present invention, for example, there is described a method for assembling beam reinforcing bars, which is an example of a reinforcing bar unit, in which pre-assembled central units are manufactured in a unitized state, in which upper and lower main reinforcing bars, which are arranged in multiple rows in the horizontal direction of the beam cross section, are connected to each other by a large number of core bars lined up in the length direction of the beam, and the manufactured pre-assembled central units are arranged in the horizontal direction of the beam cross section within lower stirrup bars (pre-assembled lower units) placed at the planned location for beam installation, and then upper stirrup bars (pre-assembled upper units) are placed on top of the multiple pre-assembled central units, thereby running the stirrup bars around the outer periphery of the multiple pre-assembled central units and completing the assembly of the beam reinforcing bars (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6690938 Summary of the Invention [Problem to be solved by the invention]

[0004] When fabricating a pre-assembled central unit in the beam reinforcing bar assembly method described in Patent Document 1, for example, a plurality of support members erected across left and right scaffolding are used to arrange a plurality of upper main reinforcements and lower main reinforcements in a plurality of rows in the left and right direction, with multiple rows arranged in the up and down direction, and aligned at predetermined intervals both vertically and horizontally. After that, a large number of core reinforcements are inserted from above so as to pass between adjacent upper main reinforcements and between adjacent lower main reinforcements on the left and right, and the inserted core reinforcements are connected to the corresponding upper and lower main reinforcements by rebar connecting means such as welding or bundling, thereby fabricating a pre-assembled central unit.

[0005] In particular, when each core bar has U-shaped hooks at both ends that engage with the highest upper main bar or the lowest lower main bar, the support members that support the lower main bars are positioned higher so that the lower main bars are located higher than the lower hook portions of the core bars, and each core bar is inserted from above so that its upper hook portions hook onto the highest upper main bar. After that, the support members for the lower main bars are pulled out, and the lowest lower main bar is dropped into the lower hook portions of all the core bars lined up in the longitudinal direction.

[0006] In other words, according to the beam reinforcing bar assembly method described in Patent Document 1, when manufacturing a pre-assembled central unit, it is necessary to precisely arrange the upper and lower main bars in multiple rows at predetermined positions in the vertical direction, which means that considerable effort is required to arrange the main bars.This becomes more noticeable when large-diameter, heavy reinforcing bars are used for the upper and lower main bars, such as when constructing beam reinforcing bars for relatively large underground beams used in large buildings. Furthermore, the work of inserting core bars from above the upper and lower main reinforcements that are aligned vertically and horizontally is a high-altitude job that requires the worker to climb onto the top main reinforcement, and the larger the pre-assembled central unit used in a large building, the higher the working position, so there is room for improvement in the workability of the pre-assembled central unit. When connecting the inserted core bars to the corresponding upper and lower main bars, the closer the main bars to be connected are to the center of the left and right sides of the pre-assembled central unit, the more difficult it is for workers to reach them, making it more difficult to connect the core bars to the upper and lower main bars; this becomes more pronounced the larger the pre-assembled central unit used in a large building. Furthermore, when core bars having U-shaped hook portions at both ends are used, as mentioned above, it is necessary to drop the lowest lower main bar into the lower hook portions of all core bars lined up in the longitudinal direction. However, when dropping the lower main bar into the lower hook portions, for example, due to the lower hook portions of the core bars being uneven, it may be difficult to drop the lower main bar into the lower hook portions. In such cases, it becomes necessary to perform the cumbersome manual work of re-aligning the lower hook portions of the core bars.

[0007] In view of this situation, the main objective of the present invention is to enable the rational construction of reinforcing bar units constructed by appropriately arranging a large number of reinforcing bars, thereby improving the ease of construction and shortening the construction period when constructing reinforcing bar units. [Means for solving the problem]

[0008] A first characteristic configuration of the present invention is a method for constructing a reinforcing bar unit for a reinforced concrete member, in which a large number of reinforcing bars are arranged to construct a reinforcing bar unit, The numerous reinforcing bars include main reinforcing bars having a circular or nearly circular cross section and extending in a straight line, and core reinforcing bars having U-shaped hook portions at both ends, One row of the main reinforcement and The method includes a reinforcing bar panel assembly process in which core reinforcement bars are arranged at predetermined positions vertically and horizontally to assemble a reinforcing bar panel, and a reinforcing bar unit fabrication process in which a predetermined number of the reinforcing bar panels are arranged in an upright position in the width direction of the member with the main reinforcements aligned vertically to fabricate a reinforcing bar unit. The reinforcing bar panel base assembly process includes a main reinforcement laying process of laying one row of the main reinforcements flat on a frame in parallel with each other, and a core reinforcement arrangement process of arranging one row of the core reinforcements at predetermined positions on the main reinforcements in an orientation that crosses the main reinforcements. a both end main reinforcement arranging step of arranging the main reinforcements located at both end portions of the frame inside the hook portions; and a reinforcing bar panel fabrication process for fabricating the reinforcing bar panel by assembling the main reinforcement and the core reinforcement on the frame. And, In the process of arranging the main reinforcements at both ends, the main reinforcements located at both ends of the frame are manually rolled toward the hook portions and arranged inside the hook portions, with the core reinforcements lined up on the main reinforcements with the hook portions hanging down due to their own weight. It's at the point.

[0009] According to this configuration, a row of main reinforcements is laid flat on the frame in the main reinforcement laying process, and a row of core reinforcements is arranged on top of the main reinforcements in the core reinforcement placement process. This allows the main reinforcements and core reinforcements to be easily positioned in the appropriate positions in the reinforcing bar panel fabrication process, and the appropriately positioned main reinforcements and core reinforcements can be easily assembled using reinforcing bar connecting methods such as welding and bundling. This assembly allows the subsequent reinforcing bar unit fabrication process to rationally lift the row of main reinforcements and core reinforcements as a unitized reinforcing bar panel using a crane or other lifting equipment at the construction site. This lifting allows the reinforcing bar panel laid flat on the frame to be easily converted to the upright position described above and aligned in the width direction of the member. Once a predetermined number of reinforcing bar panels have been aligned in the width direction of the member, they can be assembled to rationally construct a reinforcing bar unit. This means that even when it becomes necessary to use large-diameter, heavy reinforcing bars for the main reinforcement bars, etc., to construct a relatively large reinforcing bar unit, such as beam reinforcing bars for underground beams used in large buildings, the reinforcing bar panel can be easily constructed with little effort, and the constructed reinforcing bar panels can be easily arranged in the upright position described above in the width direction of the member with little effort, and the reinforcing bar unit can be constructed rationally by assembling a specified number of lined up reinforcing bar panels. By constructing a reinforcing bar unit in this manner, it becomes unnecessary to perform work at heights, such as, for example, lining up all the main bars to be used in the reinforcing bar unit at predetermined intervals both vertically and horizontally, and then having a worker climb onto the topmost main bar and thread a large number of core bars from above between the lower main bars. Furthermore, reinforced concrete panels can be transported in bulk on trucks and other transport vehicles without taking up too much space. This means that, for example, reinforced concrete panels can be manufactured off-site at a factory or other facility, and then transported to a construction site in bulk on a transport vehicle, where a required number of reinforced concrete panels can be assembled to form a reinforced concrete unit, thereby reducing the amount of work time required at the construction site. As a result, it is possible to rationally construct reinforcing bar units that are constructed by properly arranging a large number of reinforcing bars, improving workability and shortening the construction period when constructing reinforcing bar units. This is particularly effective when reinforcing bar units are large for use in large buildings, and the reinforcing bars used in the reinforcing bar units are large in diameter and heavy.

[0011] Furthermore, According to this configuration, each core bar is lined up on the main bars with the hooks at both ends hanging down under their own weight, and since it is common to use steel rods with circular or nearly circular cross sections for reinforcing bars such as main bars, in the process of placing the main bars at both ends, the main bars located at both ends of the frame can be rolled towards the hooks of each core bar, so that the main bars can be easily placed inside the hooks. That is, for example, in the case where a plurality of upper main reinforcements and lower main reinforcements are aligned vertically and horizontally at a predetermined interval, and then a number of core reinforcements with U-shaped hook portions at both ends are inserted from above them, and each main reinforcement and core reinforcement are connected with a reinforcing bar connecting means, it is possible to eliminate the need for time-consuming and cumbersome work of temporarily placing each lower main reinforcement in a position higher than the lower hook portion of the core reinforcement, inserting each core reinforcement from above each upper main reinforcement, and then dropping the lowest lower main reinforcement into the lower hook portion of each core reinforcement. As a result, each reinforcing bar panel of the reinforcing bar unit can be constructed rationally, which improves workability and shortens the construction period when constructing the reinforcing bar unit. This is particularly effective when the reinforcing bars used in the reinforcing bar unit, such as the main bars, have large diameters and are heavy.

[0012] The present invention Second characteristic configuration has a plurality of retaining metal fittings that engage with one row of the main reinforcements to hold the main reinforcements in place, The reinforcing bar panel base assembly process includes a retainer fitting engagement process in which the retainer fittings are arranged on the frame in parallel with the core bars and engaged with one row of the main bars.

[0013] According to this configuration, when flat-laid reinforcing bar panels are erected and arranged in the reinforcing bar unit manufacturing process, it is possible to more reliably prevent problems such as misalignment of each main reinforcing bar connected to a predetermined position of the core bar by reinforcing bar connecting means such as welding or bundling. This eliminates the need to adjust the reinforcing bar panels due to misalignment of the main reinforcements, allowing for more efficient construction of reinforcing bar units. As a result, it is possible to further improve workability and shorten construction time when constructing reinforcing bar units.

[0014] The present invention Third characteristic configuration a comb-shaped gauge metal fitting that engages with the reinforcing bar panel to hold the reinforcing bar panel in the upright position and aligned at predetermined intervals in the width direction of the member, The reinforcing bar unit manufacturing process includes a reinforcing bar panel arrangement process in which the first reinforcing bar panel is leaned vertically against a support in the upright position, and then the second and subsequent reinforcing bar panels are sequentially arranged in the upright position at predetermined positions spaced a predetermined distance from the preceding reinforcing bar panel in the width direction of the member, and a gauge fitting engagement process in which, each time the second and subsequent reinforcing bar panels are arranged in the upright position at the predetermined positions, the gauge fittings are engaged with the multiple reinforcing bar panels from above in a position that intersects with them.

[0015] According to this configuration, in the reinforcing bar unit manufacturing process, the reinforcing bar panels are sequentially arranged in the above-described upright position in the width direction of the member, and can be stably held in an upright position at a predetermined interval until they reach a predetermined number. This eliminates the need to rearrange fallen reinforcing bar panels, allowing the required number of reinforcing bar panels to be arranged efficiently and properly, and reinforcing bar units to be constructed more rationally and accurately. As a result, it is possible to further improve workability and shorten construction time when constructing reinforcing bar units.

[0016] The present invention Fourth characteristic configuration The reinforcing bar unit is a beam reinforcing bar for a reinforced concrete beam, The large number of reinforcing bars include upper stirrup bars and lower stirrup bars that surround from above and below a predetermined number of the reinforcing bar panels arranged in the beam width direction, The reinforcing bar unit manufacturing process includes a split reinforcing bar unit ground assembling process in which the multiple reinforcing bar panels lined up in the beam width direction in the upright position are tied together to form split reinforcing bar units, a split reinforcing bar unit installation process in which the split reinforcing bar units are lifted and installed inside the lower stirrup bars arranged at the installation location of the reinforced concrete beam, and an upper stirrup bar assembling process in which, when a predetermined number of split reinforcing bar units have been installed inside the lower stirrup bars in the split reinforcing bar unit installation process and the number of reinforcing bar panels inside the lower stirrup bars has reached a predetermined number, the upper stirrup bar assembling process

[0017] According to this configuration, each time a plurality of reinforcing bar panels are unitized as split reinforcing bar units in the split reinforcing bar unit ground assembly process, the split reinforcing bar unit is installed in the lower stirrup bars arranged at the installation location of the reinforced concrete beam using a lifting machine such as a crane in the split reinforcing bar unit installation process, and when a predetermined number of split reinforcing bar units are installed in the lower stirrup bars in this installation and the number of reinforcing bar panels in the lower stirrup bars reaches a predetermined number, the upper stirrup bars are assembled in the upper stirrup bar assembling process so as to surround from above the predetermined number of reinforcing bar panels in the lower stirrup bars, thereby constructing beam reinforcing bar for a reinforced concrete beam at the installation location of the reinforced concrete beam. In other words, this configuration is suitable for constructing relatively large beam reinforcing bars that need to be divided into multiple pieces, such as beam reinforcing bars for underground beams used in large buildings, because their weight exceeds the lifting capacity of the lifting machine. When the beam reinforcing bars are constructed in this manner, the weight of the split reinforcing bar unit lifted by the lifting machine does not include the weight of the lower stirrup bars and the weight of the upper stirrup bars, so the length of the split reinforcing bar unit in the beam length direction can be increased without increasing the weight of the split reinforcing bar unit, which is limited to the lifting weight of the lifting machine. This allows the number of divisions of the beam reinforcing bars in the beam length direction to be reduced, and the number of connection points between the divided reinforcing bar units in the beam length direction to be eliminated or reduced. As a result, it is possible to improve workability and shorten construction time when constructing relatively large beam reinforcing bars. [Brief explanation of the drawings]

[0018] [Figure 1] Side view showing the state of the beam reinforcing bars installed [Figure 2] A front view showing the first step of the lower stirrup reinforcing bar arrangement process, the second step of the lower stirrup reinforcing bar connection process, and the third step of the lower stirrup reinforcing bar horizontal installation process. [Figure 3] A side view showing the first step of the lower stirrup reinforcing bar arrangement process, the second step of the lower stirrup reinforcing bar connection process, and the third step of the lower stirrup reinforcing bar horizontal installation process. [Figure 4] A front view showing the fourth step of laying the main reinforcement flat and the fifth step of placing the core reinforcement [Figure 5] A plan view showing the fourth step of laying the main reinforcement flat and the fifth step of arranging the core reinforcement [Figure 6] A front view showing the sixth step of arranging the main reinforcements at both ends and the seventh step of arranging the main reinforcements at the center [Figure 7] A plan view showing the sixth step of arranging main reinforcements at both ends and the seventh step of arranging main reinforcements at the center [Figure 8] A front view showing the eighth step of the retaining fitting engagement step, the ninth step of the reinforcing bar panel fabrication step, and the tenth step of the reinforcing bar panel arrangement step. [Figure 9] FIG. 10 is a plan view showing the eighth step of engaging the retaining fittings and the ninth step of manufacturing the reinforcing bar panel. [Figure 10] A front view showing the tenth step of the reinforcing bar panel arrangement process, the eleventh step of the gauge fitting engagement process, and the twelfth step of the divided reinforcing bar unit ground assembly process. [Figure 11] A plan view showing the tenth step of arranging the reinforcing bar panel, the eleventh step of engaging the gauge fittings, and the twelfth step of assembling the divided reinforcing bar units. [Figure 12]A front view showing the 13th step of installing the divided reinforcing bar units, the 14th step of arranging the upper end main reinforcement, and the 15th step of assembling the upper stirrup reinforcement. DETAILED DESCRIPTION OF THE INVENTION

[0019] As an example of a form for implementing the present invention, the following describes, with reference to the drawings, an embodiment in which the method for constructing reinforcing bar units for reinforced concrete members according to the present invention is applied to constructing beam reinforcing bars for underground beams, which are an example of reinforcing bar units for relatively large reinforced concrete members used in large-scale buildings. Furthermore, the method of constructing reinforcing bar units for reinforced concrete members according to the present invention is not limited to the case of constructing beam reinforcing bars for relatively large underground beams, but can also be applied to the case of constructing beam reinforcing bars for reinforced concrete beams of general size and column reinforcing bars for reinforced concrete columns.

[0020] As shown in Fig. 1, the beam reinforcing bars U for underground beams exemplified in this embodiment are installed horizontally at the location where the underground beams are to be installed at the construction site via a number of spacers 1 made of high-strength concrete. Although not shown in the figure, the beam reinforcing bars U installed at the location where the underground beams are to be installed at the construction site are surrounded by a formwork for pouring concrete, and the underground beams are installed by pouring concrete into the formwork.

[0021] As shown in Figures 1 to 12, the beam reinforcing bar U is constructed by arranging a large number of reinforcing bars 10, which are made of rod-shaped steel material with a circular or nearly circular cross section. The large number of reinforcing bars 10 include a plurality of upper main reinforcements 11 arranged in three rows at the top of the beam reinforcing bar U, a plurality of lower main reinforcements 12 arranged in three rows at the bottom of the beam reinforcing bar U, a plurality of core reinforcements 13 spanning one vertical row of the upper main reinforcements 11 and the lower main reinforcements 12, a plurality of upper stirrup reinforcements 14 (see Figures 1 and 12) that surround the upper main reinforcements 11 from above, and a plurality of lower stirrup reinforcements 15 (see Figures 1 to 2 and 12) that surround the lower main reinforcements 12 from below. Both ends of each core reinforcement 13 are provided with hook portions 13A bent into a U shape.

[0022] The method of constructing reinforcing bar units for reinforced concrete members exemplified in this embodiment includes a lower stirrup bar installation process in which a predetermined number of lower stirrup bars 15 and the like are installed at the location where the underground beam is to be installed at the construction site, as shown in Figs. 2 and 3; a reinforcing bar panel base assembly process in which a vertical row of upper and lower main bars 11, 12 and core bars 13 are arranged in predetermined vertical and horizontal positions at a reinforcing bar panel base assembly site set up within the premises of the construction site to form a reinforcing bar panel P, as shown in Figs. 4 to 9; and a beam reinforcing bar fabrication process (reinforcing bar unit fabrication process) in which a predetermined number of reinforcing bar panels P are arranged in the beam width direction in an upright position with the upper and lower main bars 11, 12 lined up in the vertical direction to produce beam reinforcing bars U as reinforcing bar units, as shown in Figs. 1, 8, and 10 to 12.

[0023] As shown in Figures 2 and 12, each of the upper and lower stirrup reinforcements 14, 15 has one end in the beam width direction that is a long end 14A, 15A that extends in the vertical direction to the same length as the core reinforcement 13, and the other end in the beam width direction that is a short end 14B, 15B that extends in the vertical direction to a length shorter than the core reinforcement 13, and is bent in a J shape that surrounds from above and below a predetermined number of reinforcing bar panels P lined up in the beam width direction in the upright position described above.

[0024] The shapes of the upper and lower stirrup reinforcing bars 14, 15 can be changed in various ways, and although not shown in the drawings, for example, the upper and lower stirrup reinforcing bars 14, 15 may be bent into a U shape with both end portions in the beam width direction becoming the long end portions 14A, 15A described above, or each upper stirrup reinforcing bar 14 may be bent into a J shape with one end portion in the beam width direction becoming the long end portion 14A described above and the other end portion in the beam width direction becoming the short end portion 14B described above, and each lower stirrup reinforcing bar 15 may be bent into a U shape with both end portions in the beam width direction becoming the long end portions 15A described above.

[0025] As shown in Figures 1 and 6 to 12, the beam reinforcing bars U are provided with a plurality of retaining fittings 2 that engage with each of the main reinforcing bars 11, 12 in a vertical row to hold these main reinforcing bars 11, 12 in position, and a plurality of comb-shaped gauge fittings 3 that engage with the reinforcing bar panel P to hold the reinforcing bar panel P in the upright position described above, lined up at predetermined intervals in the beam width direction. Each retaining fitting 2 is made of flat steel and has a plurality of recesses 2A formed therein for engaging with each of the main reinforcing bars 11, 12 in a vertical row. Each gauge fitting 3 has a plurality of recesses 3A formed therein for engaging with a plurality of reinforcing bar panels P.

[0026] The construction procedure of the method for constructing reinforcing bar units for reinforced concrete members exemplified in this embodiment will be described below. In this embodiment, an example of a construction procedure is shown in which the above-mentioned lower stirrup reinforcement installation process, reinforcing bar panel base assembly process, and beam reinforcing bar fabrication process are carried out in succession, but if the personnel can be secured, the lower stirrup reinforcement installation process may be carried out in parallel with the reinforcing bar panel base assembly process, for example, to shorten the construction period.

[0027] As shown in Figures 2 and 3, the lower stirrup bar installation process includes a lower stirrup bar arrangement process as step 1, a lower stirrup bar connection process as step 2, and a lower stirrup bar horizontal installation process as step 3. These first to third processes are carried out at locations adjacent to the underground beam installation location.

[0028] In the first step, the lower stirrup reinforcing bar arranging step, a predetermined number of lower stirrup reinforcing bars 15 are arranged at predetermined intervals in the beam length direction of the beam reinforcing bars U (see Figs. 2 and 3).

[0029] In the second step, the lower stirrup reinforcing bars connecting step, the long end 15A of each lower stirrup reinforcing bar 15 arranged in the beam length direction is connected to three rows of upper main reinforcements 11 and three rows of lower main reinforcements 12 provided at one end of the beam width direction of the beam reinforcing bars U. Also, the short end 15B of each lower stirrup reinforcing bar 15 is connected to three rows of lower main reinforcements 12 provided at the other end of the beam width direction of the beam reinforcing bars U (see Figures 2 and 3). This allows a predetermined number of lower stirrup reinforcing bars 15 to be unitized.

[0030] In the third step, the horizontal installation process of the lower stirrup bars, a predetermined number of unitized lower stirrup bars 15 are installed horizontally at the underground beam installation location using multiple types of spacers 1 with different heights (see Figures 2 and 3).

[0031] As shown in Figures 4 to 9, the reinforcing bar panel assembly process includes the fourth step of laying the main reinforcement flat, the fifth step of arranging the core reinforcement, the sixth step of arranging the main reinforcement at both ends, the seventh step of arranging the central main reinforcement, the eighth step of engaging the retaining fittings, and the ninth step of manufacturing the reinforcing bar panel.

[0032] In the fourth step, the main reinforcement laying process, each vertical row of main reinforcements 11, 12 (three upper main reinforcements 11 and three lower main reinforcements 12) is laid flat in parallel on a platform 4 installed at the reinforcing panel assembly site (see Figures 4 and 5).

[0033] In the fifth step, the core reinforcement placement step, a row of core reinforcements 13 is placed at predetermined positions on each of the main reinforcements 11, 12 laid flat on the frame 4, in a position that crosses the main reinforcements 11, 12 (see Figures 4 and 5). Among the row of core reinforcements 13, the core reinforcements 13 placed at the center of the reinforcing bar panel P are previously unitized by being connected with reinforcing bars 16 in a state in which the hook portions 13A at both ends hang down and are spaced apart at predetermined intervals in the longitudinal direction of the beam. This allows the core reinforcements 13 to be placed easily and quickly in the core reinforcement placement step. Furthermore, the core reinforcements 13 placed at the end of the reinforcing bar panel P are aligned on each of the main reinforcements 11, 12 with the hook portions 13A at both ends hanging down due to their own weight.

[0034] In the sixth step, the process of placing main reinforcements at both ends, the main reinforcements 11, 12 located at both ends of the frame 4 are manually rolled toward the hook portions 13A of the core reinforcement 13 and placed inside the hook portions 13A of the core reinforcement 13 (see Figures 6 and 7).

[0035] In the seventh step, the central main reinforcement placement step, the main reinforcements 11, 12 located on the central side of the frame 4 are manually rolled to widen the gap between them and place them in the appropriate positions relative to the core reinforcement 13 (see Figures 6 and 7).

[0036] In the eighth step, the retaining fixture engaging step, the retaining fixtures 2 are arranged parallel to the core reinforcements 13 on the frame 4, and are then engaged with the main reinforcements 11, 12 so that each recess 2A engages with each main reinforcement 11, 12 from below (see Figures 8 and 9). By engaging each retaining fixture 2 with each main reinforcement 11, 12 in this manner, each vertical row of main reinforcements 11, 12 is sandwiched between each core reinforcement 13 and each retaining fixture 2, and each main reinforcement 11, 12 can be stably held in a predetermined position.

[0037] In the ninth step, the reinforcing bar panel manufacturing process, a vertical row of main reinforcements 11, 12 and core reinforcements 13 arranged in predetermined vertical and horizontal positions on the frame 4 are assembled using reinforcing bar connecting means (not shown) such as welding or bundling to manufacture the reinforcing bar panel P (see Figures 8-9).

[0038] As shown in Figures 1, 8, and 10 to 12, the beam reinforcing bar manufacturing process includes a reinforcing bar panel arrangement process as step 10, a gauge fitting engagement process as step 11, a split reinforcing bar unit base assembly process as step 12, a split reinforcing bar unit installation process as step 13, an end upper main reinforcement arrangement process as step 14, and an upper stirrup bar assembly process as step 15. Of these processes, steps 10 to 12 are carried out at a split reinforcing bar unit base assembly site set up on the construction site grounds.

[0039] In the tenth step, the reinforcing bar panel placement process, the reinforcing bar panels P fabricated on the frame 4 are successively switched from their flat position on the frame 4 to the above-mentioned upright position using a lifting machine (not shown) such as a crane provided at the construction site, and removed from the frame 4. Using scaffolding 5 provided at the split reinforcing bar unit assembly site as a support, the first reinforcing bar panel P is leaned vertically against the scaffolding 5 in the above-mentioned upright position, and then the second and subsequent reinforcing bar panels P are successively placed in the above-mentioned upright position at predetermined positions spaced a predetermined distance from the preceding reinforcing bar panel P in the beam width direction (see Figures 8 and 10). Incidentally, when each reinforcing bar panel P is placed in the upright position described above at the split reinforcing bar unit assembly site, one end of the aforementioned retaining bracket 2 located on the lower side is in contact with the ground.

[0040] In the 11th step, the gauge fitting engagement step, each time the second or subsequent reinforcing bar panels P are placed in the aforementioned predetermined position in the aforementioned upright position, the gauge fittings 3 are engaged with the multiple reinforcing bar panels P in a position that intersects with them so that each of their recesses 3A engages with the upper main reinforcement 11 of each reinforcing bar panel P from above (see Figures 10 to 11).

[0041] In the twelfth step, the split reinforcing bar unit ground assembly step, the multiple reinforcing bar panels P arranged in the beam width direction in the upright position described above are fixed and held by multiple upper and lower reinforcing bars 17, 18 bent into a U-shape and multiple reinforcing bar braces 19, etc., to form split reinforcing bar units U1 (see Figures 10-11). Then, once the split reinforcing bar units U1 have been ground assembled, each gauge fitting 3 is removed from each reinforcing bar panel P. It should be noted that the reinforcing bars 17, 18 may be, for example, straight instead of being bent in a U-shape.

[0042] In the 13th step, the split reinforcing bar unit installation step, the ground-assembled split reinforcing bar units U1 are successively lifted by a crane and installed within the plurality of lower stirrup bars 15 arranged at the underground beam installation location (see Figure 12).

[0043] In the 14th step, the upper end main reinforcement arrangement step, a predetermined number of split reinforcing bar units U1 are installed in the plurality of lower stirrup bars 15 in the 13th step, the split reinforcing bar unit installation step, and when the number of reinforcing bar panels in the lower stirrup bars 15 reaches a predetermined number, three tiers of upper main reinforcements 11 are arranged above the reinforcing bar panel P adjacent to the short end 15B of the lower stirrup bar 15 (see Figure 12).

[0044] In the fifteenth step, the upper stirrup bar assembling step, the upper stirrup bars 14 are arranged side by side at predetermined intervals in the beam length direction, surrounding a predetermined number of reinforcing bar panels P from above, and are assembled to each reinforcing bar panel P by reinforcing bar connecting means (not shown) such as welding or bundling (see Fig. 1 and Fig. 12).

[0045] As described above, in the method for constructing reinforcing bar units for reinforced concrete members exemplified in this embodiment, in the fourth step, the main reinforcement laying step, one row of main reinforcements 11, 12 are laid flat in parallel on the pedestal 4, and in the fifth step, the core reinforcement placement step, one row of core reinforcements 13 are arranged on the main reinforcements 11, 12. In the subsequent sixth step, the end-main reinforcement placement step, the core reinforcements 13 are arranged on the main reinforcements 11, 12 with their hook portions 13A hanging down. This allows the main reinforcements 11, 12 located on both ends of the pedestal 4 to be easily positioned within the hook portions 13A. In the seventh step, the center-side main reinforcement placement step, the main reinforcements 11, 12 located on the center side of the pedestal 4 are rolled toward the predetermined positions on the core reinforcements 13, allowing the main reinforcements 11, 12 to be easily positioned in the appropriate positions.

[0046] Then, in the subsequent eighth step, the retaining fixture engagement step, each retaining fixture 2 is positioned parallel to the core bars 13 and engages with one row of main reinforcements 11, 12 on the frame 4 from below, thereby securely holding the one row of main reinforcements 11, 12 in place.As a result, in the subsequent ninth step, the reinforcing bar panel production step, the main reinforcements 11, 12 and the core bars 13 can be assembled using reinforcing bar connection means such as welding or bundling, and the one row of main reinforcements 11, 12 and the core bars 13 can be easily unitized as a reinforcing bar panel P in which they are properly arranged.

[0047] Then, in the subsequent tenth step, the reinforcing bar panel arrangement step, one row of main reinforcements 11, 12 and core reinforcements 13 can be efficiently lifted using a crane while unitized as the reinforcing bar panel P. This lifting allows the reinforcing bar panel P, which is laid flat on the frame 4, to be easily switched to the upright position described above and lined up in the beam width direction at the split reinforcing bar unit base assembly site. Furthermore, because the main reinforcements 11, 12 are held in place by the retaining fittings 2, it is possible to more reliably prevent problems such as misalignment of the main reinforcements 11, 12 connected to the core reinforcement 13 in the prescribed positions by reinforcing bar connecting means such as welding or bundling when the flat-laid reinforcing bar panel P is lined up. This eliminates the need for reworking the reinforcing bar panel P due to misalignment of the main reinforcements 11, 12.

[0048] Then, after placing the first reinforcing bar panel P in the upright position described above at the split reinforcing bar unit assembly site, the gauge fitting engagement process of step 11 is performed each time the second and subsequent reinforcing bar panels P are placed in the upright position described above at the predetermined position described above.In this way, in the reinforcing bar panel placement process of step 10, the reinforcing bar panels P, which are sequentially arranged in the upright position described above in the beam width direction, can be stably held in an upright position at a predetermined interval until the predetermined number for the split reinforcing bar unit is reached, and this allows the predetermined number of reinforcing bar panels P to be arranged efficiently and properly without the need to rearrange fallen reinforcing bar panels P.

[0049] Thereafter, each time the number of reinforcing bar panels reaches a predetermined number for the divided reinforcing bar units, a divided reinforcing bar unit ground assembling step (step 12) is performed, whereby the predetermined number of reinforcing bar panels P can be successively unitized as divided reinforcing bar units U1. Each time a reinforcing bar panel P is unitized, a divided reinforcing bar unit installation step (step 13) is performed, whereby the divided reinforcing bar units U1 can be lifted by a crane and installed in the lower stirrup bars 15 arranged at the installation location of the underground beam. Then, when a predetermined number of divided reinforcing bar units U1 have been installed in the lower stirrup bars 15 through this installation, and the number of reinforcing bar panels in the lower stirrup bars 15 has reached a predetermined number, a 14th step, end upper main reinforcement reinforcing bar arrangement step is performed to assemble the remaining three rows of upper main reinforcements 11, and a 15th step, upper stirrup reinforcement installation step, is performed to assemble a plurality of upper stirrup bars 14 so as to surround the predetermined number of reinforcing bar panels P in the lower stirrup bars 15 from above, thereby constructing a beam reinforcing bar U for the underground beam at the installation location of the underground beam.

[0050] In other words, the method of constructing reinforcing bar units for reinforced concrete members exemplified in this embodiment is suitable for constructing relatively large beam reinforcing bars U, such as beam reinforcing bars U for underground beams used in large buildings, which use large-diameter, heavy reinforcing bars 10 for the upper and lower main reinforcements 11, 12, etc., and whose total weight exceeds the lifting capacity of a lifting machine and therefore needs to be divided into multiple pieces.

[0051] When the beam reinforcing bars U are constructed as described above, the beam reinforcing bars U can be easily constructed starting from the reinforcing bar panel P with little effort, even when large-diameter, heavy reinforcing bars 10 are used for the upper and lower main reinforcing bars 11, 12, etc. Furthermore, the weight of the split reinforcing bar unit U1 lifted by the lifting machine does not include the weight of the upper stirrup bars 14 and the lower stirrup bars 15, so the length of the split reinforcing bar unit U1 in the beam length direction can be increased without increasing the weight of the split reinforcing bar unit U1, which is limited to the lifting weight of the lifting machine. This makes it possible to reduce the number of divisions of the beam reinforcing bar U in the beam length direction, and to eliminate or reduce the number of connection points between the split reinforcing bar units U1 in the beam length direction.

[0052] As a result, it is possible to rationally construct large beam reinforcing bars U by properly arranging a large number of reinforcing bars 10 that are larger in diameter and heavier, thereby improving workability and shortening construction time when constructing large beam reinforcing bars U.

[0053] [Another embodiment] Another embodiment of the present invention will now be described. The configurations of the other embodiments described below are not limited to being applied alone, but can also be applied in combination with the configurations of the above-described embodiment or other other embodiments.

[0054] (1) In the above embodiment, a method for constructing reinforcing bar units for reinforced concrete members is exemplified in which the reinforcing bar unit manufacturing process includes a split reinforcing bar unit ground assembly process and a split reinforcing bar unit installation process. However, the present invention is not limited to this. For example, the split reinforcing bar unit ground assembly process and the split reinforcing bar unit installation process are not included, and the reinforcing bar panel P may be installed within the lower stirrup bars 15 arranged at the installation location of the reinforced concrete beam in the reinforcing bar panel installation process. Furthermore, as a method for constructing reinforcing bar units for reinforced concrete members, if the weight of the reinforcing bar unit U does not exceed the lifting capacity of a lifting machine, instead of the split reinforcing bar unit ground assembly process and the split reinforcing bar unit installation process, a reinforcing bar unit ground assembly process and a reinforcing bar unit installation process may be provided, in which in the reinforcing bar unit ground assembly process, the reinforcing bar unit U is ground assembled at a reinforcing bar unit ground assembly site set up on the construction site premises, and then in the reinforcing bar unit installation process, the ground assembled reinforcing bar unit U is installed at the installation location of the reinforced concrete member using a lifting machine.

[0055] (2) In the above embodiment, the core bar 13 is exemplified as having a hook portion 13A bent into a U-shape. However, this is not limited to this. For example, the core bar 13 may have a hook portion 13A bent into an L-shape, or may not have a hook portion 13A.

[0056] (3) In the above embodiment, each retaining fixture 2 is exemplified as being made of flat steel, but this is not limited thereto. For example, it may be made of steel bars, constructed by welding together a single first reinforcing bar spanning each of the main reinforcements 11, 12 in a vertical row and a plurality of second reinforcing bars bent into a U-shape and capable of engaging with each of the main reinforcements 11, 12 in a vertical row. Furthermore, in the above embodiment, an example was given in which multiple retaining fittings 2 are engaged with each of the main reinforcements 11, 12 from below in the eighth step of the retaining fitting engagement process, but this is not limited to this, and for example, multiple retaining fittings 2 may be engaged with each of the main reinforcements 11, 12 from above. Furthermore, in the above embodiment, when each reinforcing bar panel P is placed on the split reinforcing bar unit assembly site in the upright position described above in the tenth step of the reinforcing bar panel placement process, one end of the retaining bracket 2 on the lower side is grounded, but this is not limited to this, and for example, the lower hook portion 13A of each core bar 13 may be grounded.

[0057] (4) In the above embodiment, the split reinforcing bar unit U1 is exemplified as a unit made up of seven reinforcing bar panels P, but this is not limited to this. As long as it does not exceed the lifting weight capacity of the lifting machine, it may also be a unit made up of six or fewer reinforcing bar panels P, or a unit made up of eight or more reinforcing bar panels P.

[0058] (5) In the above embodiment, two split reinforcing bar units U1 are installed in the lower stirrup bar 15 placed at the underground beam installation location, but this is not limited to this, and three or more split reinforcing bar units U1 may be installed in the lower stirrup bar 15. [Explanation of symbols]

[0059] 2 Retaining bracket 3 Gauge Fittings 4 Mounting stand 5 Support part 10 Reinforced concrete 11 Upper main muscle 12 Lower main reinforcement 13 Core muscle 13A Hook part 14 Upper stirrup muscle 15 Lower stirrup muscle P Reinforced Panel U-reinforcement unit U1 Split rebar unit

Claims

1. A method for constructing reinforcing bar units for reinforced concrete members, in which a large number of reinforcing bars are arranged to construct reinforcing bar units, comprising the steps of: The numerous reinforcing bars include main reinforcing bars having a circular or nearly circular cross section and extending in a straight line, and core reinforcing bars each having a U-shaped hook portion at each end, The method includes a reinforcing bar panel assembly process in which a row of the main reinforcements and the core reinforcements are arranged in predetermined vertical and horizontal positions to form a reinforcing bar panel, and a reinforcing bar unit fabrication process in which a predetermined number of the reinforcing bar panels are arranged in an upright position with the main reinforcements aligned vertically in the width direction of the member to fabricate a reinforcing bar unit. The reinforcing bar panel base assembling process includes a main reinforcing bar laying process of laying one row of the main reinforcing bars flat on a frame in parallel relation to one another, a core reinforcing bar arranging process of arranging one row of the core reinforcing bars at predetermined positions on the main reinforcing bars so that they intersect with the main reinforcing bars, a both end main reinforcing bar arranging process of arranging the main reinforcing bars located at both ends of the frame within the hook portions, and a reinforcing bar panel fabrication process of fabricating the reinforcing bar panel by assembling the main reinforcing bars and the core reinforcing bars on the frame, In the process of placing the main reinforcements at both ends, the main reinforcements located at both ends of the frame are manually rolled toward the hook portions and placed inside the hook portions, relative to the core reinforcements lined up on the main reinforcements with the hook portions hanging down under their own weight. This is a method for constructing reinforcing bars for reinforced concrete members.

2. a plurality of retaining metal fittings that engage with one row of the main reinforcements to hold the main reinforcements in place; 2. A method for constructing reinforcing bar units for reinforced concrete members according to claim 1, wherein the reinforcing bar panel ground assembly process includes a retaining bar engagement process in which the retaining bar is positioned parallel to the core bars on the frame and engaged with one row of the main bars.

3. a comb-shaped gauge metal fitting that engages with the reinforcing bar panel to hold the reinforcing bar panel in the upright position and aligned at predetermined intervals in the width direction of the member; 3. The reinforcing bar unit manufacturing process includes a reinforcing bar panel arrangement process in which a first reinforcing bar panel is leaned vertically against a support portion in the upright position, and then the second and subsequent reinforcing bar panels are sequentially arranged in the upright position at predetermined positions spaced a predetermined distance from the preceding reinforcing bar panel in the width direction of the member from the preceding reinforcing bar panel; and a gauge fitting engagement process in which, each time the second and subsequent reinforcing bar panels are arranged in the upright position at the predetermined positions, the gauge fittings are engaged from above with the plurality of reinforcing bar panels in a position that intersects with them.

4. The reinforcing bar unit is a beam reinforcing bar for a reinforced concrete beam, The large number of reinforcing bars include upper stirrup bars and lower stirrup bars that surround from above and below a predetermined number of the reinforcing bar panels arranged in the beam width direction, 4. The reinforcing bar unit construction method for reinforced concrete members according to claim 1, wherein the reinforcing bar unit fabrication process includes a split reinforcing bar unit ground assembling process of bundling the plurality of reinforcing bar panels lined up in the beam width direction in the upright position to form split reinforcing bar units, a split reinforcing bar unit installation process of lifting the split reinforcing bar units and installing them inside the lower stirrup bars arranged at the installation location of the reinforced concrete beam, and an upper stirrup bar assembling process of assembling the upper stirrup bars so as to surround the predetermined number of reinforcing bar panels from above when a predetermined number of split reinforcing bar units have been installed inside the lower stirrup bars in the split reinforcing bar unit installation process and the number of reinforcing bar panels inside the lower stirrup bars has reached a predetermined number.

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