Arranging method for beam reinforcement bars

Abstract

To provide a construction method for beam reinforcement bars constituting a beam connecting columns, which improves the workability of the beam reinforcement bars.SOLUTION: A reinforcement bar arranging method for beam reinforcement bars constituting a beam connecting columns comprises a center reinforcement unit production step (step S101) of producing a center reinforcement unit; an end reinforcement first step (step S102) of arranging a pre-assembled end reinforcement having an upper part opened at a connection part between a column and a beam; a center reinforcement unit installation step (step S103) of lifting the center reinforcement unit and arranging an end of the center reinforcement unit inside the pre-assembled end reinforcement through the upper opened part of the pre-assembled end reinforcement; and an end reinforcement second step (step S104) of installing a beam-end cap tie covering the upper opened part of the pre-assembled end reinforcement.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a beam reinforcement arrangement method. [Background technology]

[0002] For example, Patent Document 1 discloses a reinforcement arrangement for beam reinforcement in reinforced concrete beams, which is composed of upper main reinforcement, lower main reinforcement, and stirrups surrounding the upper and lower main reinforcement and arranged in parallel in the extension direction of the beam. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-29249 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the less work required for beam reinforcement, the shorter the construction period. Therefore, there is a demand for a beam reinforcement method that is easy to work with and requires less reinforcement work. [Means for solving the problem]

[0005] The beam reinforcement method that solves the above-mentioned problems is a method for arranging beam reinforcement that constitutes a beam that connects columns, and includes a central reinforcement unit manufacturing process that manufactures a central reinforcement unit, a first end reinforcement process that installs pre-assembled end reinforcement with an upper open portion at the connection between the column and the beam, a central reinforcement unit installation process that lifts the central reinforcement unit and positions the end of the central reinforcement unit inside the pre-assembled end reinforcement through the upper open portion, and a second end reinforcement process that installs a beam end cap tie to cover the upper open portion. [Effects of the Invention]

[0006] According to the present invention, workability when arranging beam reinforcement is improved. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a top view showing a schematic configuration of beam reinforcement arranged by one embodiment of the beam reinforcement arrangement method of the present invention. FIG. [Figure 2] FIG. 1(a) is a perspective view showing an example of a central reinforcement unit, and FIG. 1(b) is a view of the example of the central reinforcement unit as seen from the extension direction of the first beam. [Figure 3] FIG. 1(a) is a perspective view showing an example of end reinforcement, and FIG. 1(b) is a view showing the example of end reinforcement as seen from the extension direction of the first beam. [Figure 4] 1 is a flowchart showing one embodiment of a beam reinforcement arrangement method of the present invention. [Figure 5] FIG. 10 is a perspective view showing the reinforcement at the pre-assembled end portion. [Figure 6] FIG. 10 is a perspective view schematically showing how the central reinforcement unit is placed inside the pre-assembled end reinforcement in the central reinforcement unit installation process. [Figure 7] FIG. 10 is a perspective view schematically showing how the bar reinforcement bars (support reinforcement bars) are arranged in a state in which the central reinforcement unit is lifted in the central reinforcement unit installation step. [Figure 8] FIG. 10 is a perspective view schematically showing the second end reinforcement step. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of a beam reinforcement arrangement method of the present invention will be described with reference to FIGS. 1 to 8. FIG. As shown in Figure 1, in the beam reinforcement arrangement method of the present invention, beam reinforcement 20 is arranged to constitute a first beam 11 connecting a pair of columns 10. The columns 10 are provided with main column reinforcement and tie bars (not shown). The first beam 11 has a haunch 12 at the connection point with each column 10. Furthermore, each column 10 is connected to a second beam 13 extending toward the opposite side of the first beam 11. The second beam 13 has a haunch 14 at the connection point with the column 10. Note that hereinafter, the direction in which the beams 11, 13 extend, which is the left-right direction in Figure 1, is referred to as the beam extension direction. Furthermore, the width direction of the beams 11, 13, which is the up-down direction in Figure 1, is referred to as the beam width direction.

[0009] The beam reinforcement 20 includes a central reinforcement unit 21 and a pair of end reinforcements 22. The central reinforcement unit 21 is connected to the end reinforcements 22 at the connection portion between each column 10 and the first beam 11. The end reinforcements 22 are formed wider than the central reinforcement unit 21 in the width direction of the beam. In this embodiment, the end reinforcement 22 is arranged to connect the first beam 11 and the second beam 13 through the column 10. More specifically, the end reinforcement 22 is provided so as to straddle the haunch portion 12 of the first beam 11, the column 10, and the haunch portion 14 of the second beam 13. A central reinforcement unit 25, which constitutes the beam reinforcement of the second beam 13 and has a configuration similar to that of the central reinforcement unit 21, is connected to the end reinforcement 22 on the opposite side of the first beam 11 from the column 10.

[0010] (Central reinforcement unit) As shown in Figures 2(a) and 2(b), the central reinforcement unit 21 has upper beam main reinforcements 31, lower beam main reinforcements 32, and central stirrups 33. The upper beam main reinforcements 31 extend in the beam extension direction at the upper end portion of the first beam 11 shown in Figure 1. The lower beam main reinforcements 32 extend in the beam extension direction at the lower end portion of the first beam 11 shown in Figure 1. The upper beam main reinforcements 31 and the lower beam main reinforcements 32 function as central beam main reinforcements. The upper beam main reinforcements 31 and the lower beam main reinforcements 32 are connected to the central stirrups 33. The central stirrups 33 are arranged in parallel in the beam extension direction in the portion disposed between the haunches 12. The central stirrups 33 are arranged to surround the upper beam main reinforcements 31 and the lower beam main reinforcements 32 from the outside. In this embodiment, the upper beam main reinforcement 31 and the lower beam main reinforcement 32 are each made of fixed-length reinforcing bars, but are not limited to this and may be made of cut reinforcing bars.

[0011] (End reinforcement) As shown in Figures 3(a) and 3(b), the end reinforcement 22 includes upper end main reinforcements 41, lower end main reinforcements 42, beam end stirrups 43, anchor reinforcements 44, bar-like reinforcements 45, and beam end cap ties 46. The upper end main reinforcements 41 and lower end main reinforcements 42 function as end-side beam main reinforcements. The beam end stirrups 43, anchor reinforcements 44, and bar-like reinforcements 45 are constructed using the two-wire welding method (two-wire mesh method) approved by the Building Center of Japan.

[0012] The end upper main reinforcement 41 extends in the extension direction of the beam at the upper end portion of the first beam 11 shown in FIG. 1. The end upper main reinforcement 41 is arranged so as to straddle the haunch portion 12 of the first beam 11, the column 10, and the haunch portion 14 of the second beam 13 shown in FIG. 1. The end upper main reinforcement 41 is made of fixed-length reinforcing bars. The end upper main reinforcement 41 is connected to each beam upper main reinforcement 31 of the central reinforcing bar unit 21 shown in FIG. 2 by lap splices. The end upper main reinforcement 41 may also be made of cut reinforcing bars.

[0013] The end lower end main reinforcement 42 extends in the extension direction of the beam at the lower end portion of the first beam 11. The end lower end main reinforcement 42 is arranged so as to straddle the haunch portion 12 of the first beam 11, the column 10, and the haunch portion 14 of the second beam 13. The end lower end main reinforcement 42 is made of fixed-length reinforcing bars. The end lower end main reinforcement 42 is connected to the beam lower end main reinforcement 32 of the central reinforcing bar arrangement unit 21 by a lap joint. The end lower end main reinforcement 42 may also be made of cut reinforcing bars.

[0014] The beam end stirrups 43 are arranged in the portions corresponding to the haunch portions 12 and 14 of the beams 11 and 13. The beam end stirrups 43 are arranged in parallel in the extension direction of the beam. The beam end stirrups 43 have a U-shape with an open upper end. The beam end stirrups 43 have lower reinforcements 43a and a pair of upper extension reinforcements 43b. The lower reinforcements 43a extend below the lower end main reinforcements 42 in the width direction of the beam. The upper extension reinforcements 43b extend upward from each end of the lower reinforcements 43a to the installation height of the upper end main reinforcements 41. The upper extension reinforcements 43b are arranged outside the upper end main reinforcements 41 and the lower end main reinforcements 42 in the width direction of the beam.

[0015] The anchor bars 44 are arranged in the portions corresponding to the haunch portions 12, 14 of the beams 11, 13. The anchor bars 44 extend in the extension direction of the beam slightly below the end upper main bars 41. The anchor bars 44 connect the upper extension bars 43b aligned in the extension direction of the beam.

[0016] The bar reinforcing bars 45 are arranged at the end on the first beam 11 side and the end on the second beam 13 side. The bar reinforcing bars 45 extend in the width direction of the beam between the end upper end main reinforcement 41 and the anchor reinforcement 44. The bar reinforcing bars 45 are erected on the anchor reinforcement 44. When the central reinforcement unit 21 is installed, the bar reinforcing bars 45 function as supporting reinforcements that support the beam upper end main reinforcement 31 of the central reinforcement unit 21.

[0017] The beam end cap ties 46 are arranged to correspond to each of the beam end stirrups 43. The beam end cap ties 46 pass above the end upper main reinforcement 41 and connect a pair of upper extension reinforcements 43b of the beam end stirrups 43.

[0018] (Beam reinforcement arrangement method) An example of a beam reinforcement arrangement method will be described with reference to FIGS. 4, the beam reinforcement method includes a central reinforcement unit fabrication step (step S101), an end reinforcement first step (step S102), a central reinforcement unit installation step (step S103), and an end reinforcement second step (step S104). Hereinafter, the place where the column 10 and beams 11, 13 are actually installed is referred to as the construction site.

[0019] In the central reinforcement unit manufacturing step (step S101), the central reinforcement unit 21 shown in FIG. 2 is manufactured outside the construction site, such as in a work yard provided near the construction site. In the first end reinforcement process (step S102), some of the end reinforcement 22 shown in Fig. 3 is arranged first. Specifically, in the first end reinforcement process, pre-assembled end reinforcement 22A shown in Fig. 5 is installed at a position corresponding to each column 10 (see Fig. 1). The pre-assembled end reinforcement 22A is composed of end lower end main reinforcement 42, beam end stirrups 43, and anchor reinforcement 44.

[0020] The pre-assembled end reinforcement 22A is installed, for example, at a construction site by arranging the beam end stirrups 43 and anchorage reinforcements 44 on both sides of the column 10, and then arranging the end lower end main reinforcement 42 so as to straddle the column 10.

[0021] The lower reinforcement 43a of the beam end stirrup 43 may be supported by a step reinforcement (not shown) extending in the beam extension direction. The upper extension reinforcement 43b of the beam end stirrup 43 may be connected by a web reinforcement (not shown) extending in the beam extension direction. The end lower main reinforcement 42 is arranged inside the beam end stirrup 43 and then connected to the beam end stirrup 43, thereby forming the reinforcement.

[0022] In the pre-assembled end reinforcement 22A, the lower surface portion is formed by the lower reinforcement 43a aligned in the extension direction of the beam, and the side surface portion is formed by the upper extension reinforcement 43b aligned in the extension direction of the beam and the anchor reinforcement 44 connecting the upper extension reinforcement 43b. Note that the pre-assembled end reinforcement 22A may be fabricated outside the construction site and then lifted and installed at the construction site.

[0023] In the central reinforcement unit installation process (step S103), the central reinforcement unit 21 is installed. Specifically, in the central reinforcement unit installation process, first, as shown in Fig. 6, the central reinforcement unit 21 is lifted using a lifting tool 50 or the like, and then the end of the central reinforcement unit 21 is placed inside the pre-assembled end reinforcement 22A through the upper open portion 47 of the pre-assembled end reinforcement 22A.

[0024] Next, as shown in FIG. 7, while the central reinforcement unit 21 is lifted, the bar-like reinforcement 45 is erected on the anchor reinforcement 44 directly below the upper beam main reinforcement 31. That is, the bar-like reinforcement 45 is erected on a pair of side surfaces of the pre-assembled end reinforcement 22A. Then, after the bar-like reinforcement 45 supports the upper beam main reinforcement 31, the lifting of the central reinforcement unit 21 is released. As a result, the central reinforcement unit 21 is installed in a state where the upper beam main reinforcement 31 is supported by the bar-like reinforcement 45. After the central reinforcement unit 21 is installed, the lower beam main reinforcement 32 is connected to the lower end main reinforcement 42. The central reinforcement unit installation process is also performed on the central reinforcement unit 25 of the second beam 13.

[0025] In the second end reinforcement arrangement process (step S104), first, the end upper end main reinforcements 41 are arranged as shown in Fig. 8. Specifically, the end upper end main reinforcements 41 are arranged so as to be supported by the bar-like reinforcements 45 inside the pre-assembled end reinforcement 22A, and then connected to the beam upper end main reinforcements 31 and the like to arrange the reinforcement.

[0026] Next, the beam end cap ties 46 are placed. Specifically, the beam end cap ties 46 are placed at positions corresponding to the beam end stirrups 43 so as to cover the upper open portions 47 of the pre-assembled end reinforcement 22A from above, and then are connected to the upper extension reinforcement 43b, etc. After the second end reinforcement step is completed, the beam reinforcement 20 consisting of the central reinforcement unit 21 and a pair of end reinforcements 22 is placed (see Figure 1).

[0027] The operation and effects of this embodiment will be described. (1) The beam reinforcement arrangement method includes a central reinforcement unit fabrication step (step S101), an end reinforcement first step (step S102), a central reinforcement unit installation step (step S103), and an end reinforcement second step (step S104). With this configuration, the central reinforcement unit can be fabricated in advance outside the construction site, thereby reducing the amount of reinforcement work at the construction site. As a result, the workability when arranging the beam reinforcement 20 can be improved. Note that in the above-described embodiment, the central reinforcement unit fabrication step is performed outside the construction site, and the end reinforcement first step is performed at the construction site, but the locations where these steps are performed are not limited to outside the construction site and at the construction site.

[0028] (2) The central reinforcement unit 21 has upper beam end main reinforcements 31 and lower beam end main reinforcements 32 that extend in the extension direction of the beam. The pre-assembled end reinforcement 22A has lower end main reinforcements 42 that extend in the extension direction of the beam and are connected to the lower beam end main reinforcements 32. In the second end reinforcement process (step S104), the upper end main reinforcements 41 that extend in the extension direction of the beam and are connected to the upper beam end main reinforcements 31 are placed inside the pre-assembled end reinforcement 22A, and then the beam end cap ties 46 are installed.

[0029] With this configuration, the central reinforcement unit 21 can be smoothly installed inside the pre-assembled end reinforcement 22A. Also, the end upper main reinforcement 41 can be easily placed inside the pre-assembled end reinforcement 22A through the upper open portion 47. As a result, the workability when arranging the beam reinforcement 20 is further improved.

[0030] (3) The central reinforcement unit installation process (step S103) includes the steps of: arranging the end of the central reinforcement unit 21 inside the pre-assembled end reinforcement 22A; then, while the central reinforcement unit 21 is lifted, installing the bar-shaped reinforcement 45 extending in the width direction of the beam between the upper end main reinforcement 31 of the beam and the lower end main reinforcement 32 of the beam on the pre-assembled end reinforcement 22A; and, after the upper end main reinforcement 31 of the beam is supported by the bar-shaped reinforcement 45, releasing the lifting of the central reinforcement unit 21.

[0031] With this configuration, the upper beam main reinforcement 31 can be stably supported after the lifting load is released. As a result, the upper beam main reinforcement 31 can be easily handled when connecting the upper beam main reinforcement 31 to the upper end main reinforcement 41 of the end portion.

[0032] (4) The pre-assembled end reinforcement 22A has beam end stirrups 43, each having a lower reinforcement 43a and a pair of upper extension reinforcements 43b extending upward from both ends of the lower reinforcement 43a, arranged in parallel in the extension direction of the beam, and anchor reinforcements 44, which extend in the extension direction of the beam and connect the upper extension reinforcements 43b. The bar-shaped reinforcements 45 are installed on the anchor reinforcements 44. This configuration makes it easy to install the bar-shaped reinforcements 45.

[0033] (5) The lower beam main reinforcement 32 and the lower end main reinforcement 42 are connected by a lap joint. The upper beam main reinforcement 31 and the upper end main reinforcement 41 are connected by a lap joint. This configuration makes it easy to adjust the position of the central reinforcement unit 21 in the extension direction of the beam.

[0034] (6) The upper beam main reinforcement 31 and the lower beam main reinforcement 32 of the central reinforcement unit 21 are made of fixed-length reinforcing bars. This eliminates the need to cut and process the reinforcing bars for the upper beam main reinforcement 31 and the lower beam main reinforcement 32, further improving the workability of the beam reinforcement 20.

[0035] (7) The upper end main reinforcement 41 and the lower end main reinforcement 42 of the end reinforcement 22 are made of fixed-length reinforcing bars. This eliminates the need to cut and process the reinforcing bars for the upper end main reinforcement 41 and the lower end main reinforcement 42, further improving the workability of the beam reinforcement 20.

[0036] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. The upper beam main reinforcement 31 and the upper end main reinforcement 41 may be connected by a pressure joint, a welded joint, a mechanical joint, or the like.

[0037] The end upper main reinforcement 41 does not have to be installed so as to straddle the column 10, the end of the first beam 11, and the end of the second beam 13. For example, if the first beam 11 is an outer end beam, the end upper main reinforcement 41 may be set so as to straddle the column 10 and the end of the first beam 11.

[0038] The lower beam end main reinforcement 32 and the lower end end main reinforcement 42 may be connected by a pressure joint, a welded joint, a mechanical joint, or the like. The end lower end main reinforcement 42 does not have to be installed so as to straddle the column 10, the end of the first beam 11, and the end of the second beam 13. For example, if the first beam 11 is an outer end beam, the end lower end main reinforcement 42 may be set so as to straddle the column 10 and the end of the first beam 11.

[0039] In the central reinforcement unit installation process (step S103), the bar-shaped reinforcement 45 does not have to be installed for the pre-assembled end reinforcement 22A. The pre-assembled end reinforcement 22A may have an end upper end main reinforcement 41. [Explanation of symbols]

[0040] 10...column, 11...first beam, 12...haunch, 13...second beam, 14...haunch, 20...beam reinforcement, 21...central reinforcement unit, 22...end reinforcement, 22A...pre-assembled end reinforcement, 25...central reinforcement unit, 31...upper beam main reinforcement, 32...lower beam main reinforcement, 33...central stirrup, 41...upper end main reinforcement, 42...lower end main reinforcement, 43...beam end stirrup, 43a...lower reinforcement, 43b...upper extension reinforcement, 44...anchoring reinforcement, 45...hairpin reinforcement, 46...beam end cap tie, 47...upper opening, 50...hanging device.

Claims

1. A method for arranging beam reinforcement that constitutes a beam connecting a column, a central reinforcement unit manufacturing process for manufacturing a central reinforcement unit; A first end reinforcement step of installing a pre-assembled end reinforcement having an upper open portion at the connection portion between the column and the beam; a central reinforcement unit installation process in which the central reinforcement unit is lifted and an end portion of the central reinforcement unit is placed inside the pre-assembled end portion reinforcement through the upper open portion; and a second end reinforcement step of installing a beam end cap tie to cover the upper open portion. Beam reinforcement arrangement method.

2. The central reinforcement unit has a beam upper end main reinforcement and a beam lower end main reinforcement, The pre-assembled end reinforcement has an end lower end main reinforcement connected to the beam lower end main reinforcement, In the second end reinforcement step, the end upper end main reinforcement connected to the beam upper end main reinforcement is placed inside the pre-assembled end reinforcement, and then the beam end cap tie is installed. The beam reinforcement arrangement method according to claim 1.

3. The central reinforcement unit installation step includes: a step of placing the end of the central reinforcement unit inside the pre-assembled end reinforcement, and then, while the central reinforcement unit is being lifted, installing supporting reinforcements extending in the width direction of the beam between the beam upper end main reinforcement and the beam lower end main reinforcement in the pre-assembled end reinforcement; and a step of releasing the lifting weight of the central reinforcement unit after the beam upper end main reinforcement is supported by the support reinforcement. The beam reinforcement arrangement method according to claim 2.

4. The pre-assembled end reinforcement is A beam end stirrup having a lower reinforcement and a pair of upper extension reinforcements extending upward from both ends of the lower reinforcement and arranged in parallel in the extension direction of the beam; A fixing bar extending in the extension direction and connecting the upper extension bar, In the step of installing the support reinforcement, the support reinforcement is erected on the anchor reinforcement. The beam reinforcement arrangement method according to claim 3.

5. The end lower end main reinforcement is installed so as to straddle the column and the ends of the two beams connected to the column. The beam reinforcement arrangement method according to any one of claims 2 to 4.

6. The beam lower end main reinforcement and the end lower end main reinforcement are connected by a lap joint. The beam reinforcement arrangement method according to any one of claims 2 to 4.

7. The upper end main reinforcement is installed so as to straddle the column and the ends of the two beams connected to the column. The beam reinforcement arrangement method according to any one of claims 2 to 4.

8. The beam upper end main reinforcement and the end upper end main reinforcement are connected by a lap joint. The beam reinforcement arrangement method according to any one of claims 2 to 4.

9. The upper end main reinforcement of the beam and the lower end main reinforcement of the beam are made of fixed-length reinforcing bars. The beam reinforcement arrangement method according to any one of claims 2 to 4.

10. The end lower end main reinforcement and the end upper end main reinforcement are made of standard length reinforcing bars. The beam reinforcement arrangement method according to any one of claims 2 to 4.

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