Temporary joining method for pre-assembled rebar

Abstract

To provide a temporary joining jig for a preassembled reinforcing bar capable of easily eliminating misalignment by mounting the jig along a joint part between main reinforcing bars when the preassembled reinforcing bar is temporarily joined.SOLUTION: A temporary joining jig 11 for preassembled reinforcing bars which is attached along the joint part of main reinforcing bars when the preassembled reinforcing bars are temporarily joined comprises a flat bar 12 of a required length along the joint part of the main reinforcing bars and single clamps 13a and 13b which are provided at both ends of the flat bar and hold the main reinforcing bars.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention is a pre-assembled reinforcing bar. Temporary joining method It is related to. [Background technology]

[0002] Conventionally, when pre-assembled rebars are temporarily joined, a batten or similar is placed across the joint between the main rebars, and then wire or similar is wound around the batten to temporarily secure them in place. The main rebars are also tapped appropriately to align them and eliminate misalignment at the joints between the main rebars.

[0003] On the other hand, although it is not a jig used for temporary joining of pre-assembled rebars, Japanese Utility Model Application Publication No. 57-187325 discloses an invention for a rebar joint fitting used for permanent joining (see Patent Document 1). This rebar joint fitting uses a crimp sleeve that is crimped and fixed to one end of the rebar to be joined, and once crimped and fixed, the crimp sleeve is difficult to remove from the rebar, so it cannot be used as a jig for temporary joining. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 57-187325 Summary of the Invention [Problem to be solved by the invention]

[0005] When the joints between the main reinforcement bars are temporarily fixed using conventional battens and wires, the joining work is time-consuming and troublesome, and the removal of the battens and wires is also time-consuming and troublesome, resulting in poor work efficiency.

[0006] Furthermore, when the main reinforcements of the pre-assembled reinforcing bars are appropriately tapped to align them and eliminate misalignment at the joints between the main reinforcements, the work takes time and effort, resulting in poor work efficiency.

[0007] Therefore, when conventional battens and wires are used, there is a problem that must be solved in order to improve the work efficiency of the temporary joining work of the main reinforcement. Furthermore, when aligning the joints between the main reinforcements of pre-assembled reinforcing bars, there is a problem that must be solved to reduce the amount of work required and shorten the work time, thereby improving work efficiency. [Means for solving the problem]

[0009] The gist of the present invention for solving the problems of the above-mentioned conventional example is that it comprises a flat bar 12 of a required length to be fitted along the joints 24 between the main reinforcements 21, 22, and single clamps 13a, 13b provided at both ends of the flat bar 12 to hold the main reinforcements 21, 22, and the single clamps 13a, 13b each comprise a presser plate 17 welded and fixed to the flat bar 12, a bolt 18 provided on the presser plate 17, a nut 19 screwed onto the bolt 18, and a receiving plate 15 which is openable and closable relative to the presser plate 17 via a shaft 16 and has a split groove 14, and the configuration allows for alignment of the core positions 23 of the joints 24 between the main reinforcements 21, 22 when the nuts 19 of the single clamps 13a, 13b are tightened against the bolts 18 with an impact tool. The method for temporarily joining pre-assembled reinforcing bars using a temporary joining jig 11 for pre-assembled reinforcing bars comprises holding one of the single clamps 13a to the end 21a of the main reinforcement 21 of the pre-assembled reinforcing bar, attaching the temporary joining jig 11 along the flat bar 12, lifting the pre-assembled reinforcing bar with the temporary joining jig 11 attached and setting it in a predetermined location, bringing the main reinforcement 21 of the pre-assembled reinforcing bar with the temporary joining jig 11 attached close to the main reinforcement 22 of the previously installed pre-assembled reinforcing bar, holding the other single clamp 13b to the end 22a of the previously installed main reinforcement 22, and tightening the nuts 19 of the single clamps 13a, 13b against the bolts 18 with an impact tool to align the core positions 23 of the joint parts 24 of the main reinforcement 21, 22.

[0010] In addition, the main reinforcement of the pre-assembled reinforcing bar 21、22 is the main reinforcement of the foundation beam or column; It includes: [Effects of the Invention]

[0011] The pre-assembled rebar temporary joining jig of the present invention can be attached along the joints of the main rebars, and the joints of the main rebars can be aligned by tightening the nuts of the single clamps onto the bolts with an impact tool. In other words, by tightening the nuts with an impact tool, misalignment between the main rebars can be easily eliminated. Therefore, compared with the conventional example, the present invention has the excellent effect of reducing the amount of work required and improving the work efficiency.

[0012] According to the method for temporarily joining pre-assembled rebars of the present invention, one single clamp of a temporary joining jig is held on the end of the main rebar of the pre-assembled rebar, the temporary joining jig is attached along the flat bar, the pre-assembled rebar with the attached temporary joining jig is lifted and placed in a predetermined location, the main rebar of the pre-assembled rebar with the attached temporary joining jig is brought close to the main rebar of the previously installed pre-assembled rebar, the other single clamp is held on the end of the previously installed main rebar, and the nut of the single clamp is tightened onto the bolt with an impact tool to align the joints of the main rebars. In other words, by tightening the nut with an impact tool, misalignment between the main rebars can be easily eliminated. Therefore, compared to conventional methods, it is possible to reduce the amount of work required and the work process, thereby improving work efficiency. In addition, by connecting the main reinforcing bars using a temporary joining jig, it is possible to prevent the pre-assembled reinforcing bars from falling over, thereby achieving various excellent effects such as improving safety. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a front view of a temporary joining jig for pre-assembled reinforcing bars according to the present invention. [Figure 2] FIG. 10 is a front view showing a state in which one single clamp is held at the end of the main reinforcement. [Figure 3] FIG. 10 is an explanatory diagram showing the state in which the pre-assembled reinforcing bars are lifted. [Figure 4] FIG. 10 is an explanatory diagram showing the state in which the pre-assembled reinforcing bars are installed in a predetermined location. [Figure 5] FIG. 10 is a front view showing the state in which the main reinforcements of the pre-assembled reinforcing bars are brought close to each other. [Figure 6] This is a front view showing the state in which the main bars of the pre-assembled reinforcing bars have been aligned with each other. [Figure 7] FIG. 10 is an explanatory diagram showing the state in which the column main reinforcement of the pre-assembled reinforcing bars is lifted. DETAILED DESCRIPTION OF THE INVENTION

[0014] Next, an embodiment of the present invention will be described with reference to the drawings. First, in Fig. 1, reference numeral 11 denotes a temporary joining jig for pre-assembled reinforcing bars, and this temporary joining jig 11 is composed of a flat bar 12 of a required length that is aligned with the joints 24 between the main reinforcing bars 21, 22 (see Figs. 5 and 6), and single clamps 13a, 13b that are provided at both ends of the flat bar 12 and hold the main reinforcing bars 21, 22, respectively.

[0015] The flat bar 12 is a thick strip of steel material, and its dimensions are, for example, about 6 mm thick, about 50 mm wide, and about 400 mm long.

[0016] As shown in Figure 1, the single clamps 13a and 13b are composed of a clamp 17 welded to the flat bar 12, a bolt 18 attached to the clamp 17, a nut 19 screwed onto the bolt 18, and a receiving plate 15 which can be opened and closed relative to the clamp 17 via a shaft 16 and which has a split groove 14. When in use, the receiving plate 15 and the clamp 17 are closed, the bolt 18 is inserted into the split groove 14, and the nut 19 is tightened from the outside of the receiving plate 15 with an impact tool or the like.

[0017] Next, we will explain the method for temporarily joining pre-assembled rebars using the temporary joining jig 11. The main bars of the pre-assembled rebars are used as main bars of foundation beams or main bars of columns, but first we will explain the case of temporarily joining main bars of foundation beams.

[0018] First, as shown in Figure 2, one single clamp 13a is held to the end 21a of the main reinforcement 21 of the pre-assembled rebar 20 that has been pre-assembled on a designated work site. That is, the receiving plate 15 and the presser plate 17 of one single clamp 13a are closed, the bolt 18 is inserted into the split groove 14, the nut 19 is tightened from the outside of the receiving plate 15, and the flat bar 12 is placed along the end 21a of the main reinforcement 21, and the temporary joining jig 11 is attached.

[0019] In this way, one of the single clamps 13a is held at the end 21a of the main reinforcement 21 of the pre-assembled reinforcing bar 20 and the temporary joining jig 11 is attached (see Figure 2), and then the pre-assembled reinforcing bar 20 is lifted using a crane (not shown) or the like and installed in a predetermined location (see Figure 4) as shown in Figure 3. In addition, reference numeral 28 in FIG. 3 indicates end portions 21a of the plurality of main reinforcements 21, and the temporary joining jig 11 is attached to each end portion 21a.

[0020] 5, the main reinforcement 21 of the pre-assembled rebar 20 to which the temporary joining jig 11 is attached and the main reinforcement 22 of the previously installed pre-assembled rebar are brought close together, and the other single clamp 13b is held to the end 22a of the previously installed main reinforcement 22. That is, the receiving plate 15 and the presser plate 17 of the other single clamp 13b are closed, the bolt 18 is inserted into the split groove 14, and the nut 19 is tightened from the outside of the receiving plate 15.

[0021] At this time, the main reinforcement 21 of the pre-assembled reinforcing bar 20 and the main reinforcement 22 of the previously installed pre-assembled reinforcing bar are in a state where the core positions 23 of the main reinforcement 21, 22 do not pass each other, as shown in Figure 5, i.e., a core misalignment has occurred. Note that the reference numeral 23 in FIG. 5 indicates the positions of the cores of the main reinforcements 21 and 22 by dashed lines for the sake of convenience, and the positions of the cores 23 are not aligned in a straight line.

[0022] Furthermore, by tightening the nuts 19 of the single clamps 13a and 13b onto the bolts 18 with an impact tool (not shown), the centers of the joints 24 between the main reinforcements 21 and 22 pass straight through, as shown in Figure 6, which means that the joints 24 can be easily aligned. In this way, by tightening the nut 19 with an impact tool, it is possible to easily eliminate misalignment of the center positions 23 of the main reinforcements 21, 22. As shown in Figure 6, the center positions 23 of the main reinforcements 21, 22 are aligned in a straight line.

[0023] Thereafter, the joints 24 between the main reinforcements 21, 22 are welded together by an appropriate welding means, and the attached temporary joining jig 11 is removed. The removed temporary joining jig 11 will be used in the temporary joining work of the pre-assembled rebars in sequence.

[0024] Next, we will explain the method for temporarily joining the column main reinforcements of pre-assembled rebars. As shown in Figure 7, the column main reinforcements 25 of the pre-assembled rebars 27, which have been pre-assembled within a specified work site, are lifted by a crane (not shown) or the like and hung down in close proximity to the previously installed column main reinforcements 26. At this time, one single clamp 13a of the temporary joining jig 11 is held at the lower end of the column main reinforcement 25, while the other single clamp 13b of the temporary joining jig 11 is held at the upper end of the column main reinforcement 26 (see Figure 5). In this case, it goes without saying that the temporary joining jig 11 is used in the vertical direction, unlike the case of the foundation beam main reinforcement bars which are installed in the horizontal direction as shown in FIG. In addition, reference numeral 29 in FIG. 7 indicates the ends of the plurality of main reinforcements 25, 26, and the temporary joining jig 11 is attached to each end.

[0025] Then, as in the case of the main reinforcement bars of the foundation beam described above, the nuts 19 of the single clamps 13a and 13b are tightened onto the bolts 18 with an impact tool to align the column main reinforcement bars 25 and 26 (see Figure 6), and then the joints between the main reinforcement bars 25 and 26 are welded together using an appropriate welding means.

[0026] In this case, if only the conventional welding work fixture was used, the column main reinforcement bars 25 would remain suspended by a crane until the main reinforcement welding was complete, but by using the temporary joining jig 11 to temporarily fix the column main reinforcement bars in eight places, the crane can be removed and used for the next column reinforcement suspension work, shortening the work process and time. In addition, it is possible to prevent the pre-assembled rebars 27 from falling over, improving safety.

[0027] The method of temporary joining pre-assembled rebars using the temporary joining jig 11 configured as described above can be used not only for the main reinforcement bars of foundation beams but also for the main reinforcement bars of columns. By tightening the nuts 19 of the single clamps 13a and 13b onto the bolts 18 with an impact tool and aligning the joints between the main reinforcements, misalignment between the main reinforcements can be easily eliminated. In addition, connecting the main reinforcement bars using temporary joining jigs prevents the pre-assembled reinforcement bars from tipping over, improving safety. [Explanation of symbols]

[0028] 11 Temporary joint jig for pre-assembled rebar 12 Flat Bar 13a One side single clamp 13b Other single clamp 14 Warizo 15 Receipt 16 Shaft 17 Presser Foot 18 volts 19 Nut 20 Pre-assembled rebar 21 Main reinforcement 21a End 22 Main reinforcement of pre-assembled rebar 22a end 23 Core position 24 Joint part 25 Column main reinforcement 26 Previously installed main column reinforcement 27 Pre-assembled rebar 28, 29 Ends of multiple main bars

Claims

1. a flat bar 12 of a required length to be placed along the joint 24 between the main reinforcements 21 and 22; and single clamps 13a and 13b provided at both ends of the flat bar 12 to hold the main reinforcements 21 and 22, respectively. Each of the single clamps 13a and 13b includes a presser foot 17 welded to the flat bar 12, a bolt 18 attached to the presser foot 17, a nut 19 threaded onto the bolt 18, and a receiving plate 15 having a slot 14 and capable of being opened and closed relative to the presser foot 17 via a shaft 16. A method for temporarily joining pre-assembled rebars using a temporary joining jig 11 for pre-assembled rebars, which is configured to be able to align the core positions 23 of the joint parts 24 of the main rebars 21 and 22 with each other while tightening the nuts 19 of the single clamps 13a and 13b against the bolts 18 with an impact tool, One of the single clamps 13a is held on the end 21a of the main reinforcement 21 of the pre-assembled reinforcing bar, and the temporary joining jig 11 is attached along the flat bar 12. The pre-assembled rebar with the temporary joining jig 11 attached is lifted and placed in a predetermined location. The main reinforcement 21 of the pre-assembled reinforcing bar to which the temporary joining jig 11 is attached and the main reinforcement 22 of the previously installed pre-assembled reinforcing bar are brought close to each other, and the other single clamp 13b is held by the end 22a of the previously installed main reinforcement 22, The nuts 19 of the single clamps 13a and 13b are tightened to the bolts 18 with an impact tool to align the center positions 23 of the joints 24 between the main reinforcements 21 and 22. A method for temporarily joining pre-assembled reinforcing bars, characterized by the above.

2. The main reinforcements 21 and 22 of the pre-assembled reinforcing bars are the main reinforcements of the foundation beam or the main reinforcements of the column. The method for temporarily joining pre-assembled reinforcing bars according to claim 1, characterized in that:

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