JP5914095B2 - Reinforcing bar installation method - Google Patents

Description

  The present invention relates to a method for building a reinforcing bar to constitute a reinforcing bar for a column of a reinforced concrete structure, and a temporary fixing device used for the method.

  This type of steel bar has a plurality of outer peripheral bars and core bars, and a shear reinforcement bar. Each outer periphery reinforcement and core reinforcement extend vertically, and constitute the main reinforcement of a pillar. The plurality of outer peripheral bars are arranged away from each other in the circumferential direction of the column. The core bars are arranged inside these outer peripheral bars. The shear reinforcing bar is wound around the plurality of outer peripheral bars. This reinforcing bar is pre-assembled at a factory or the like and carried to the construction site of the reinforced concrete structure. And it is built so that it may be added to the upper part sequentially from the lower reinforcement rod. The reinforcing bar to be added is suspended above the built-in reinforcing bar with the crane suspended. Then, the outer peripheral bars corresponding to the upper and lower reinforcing bar rods and the corresponding core bars are joined using a joint or the like.

Japanese Utility Model Publication No. 53-95515

  It was difficult to join the core bars of the upper and lower reinforcing bar rods because the outer peripheral bars obstructed them.

In order to solve the above-described problems, the reinforcing bar erection method according to the present invention is a reinforcing bar rod in which a second reinforcing rod is built above the first reinforcing rod that has been built when a column of a reinforced concrete structure is constructed. A construction method,
The plurality of first outer circumferential bars arranged away from each other in the circumferential direction of the first reinforcing bar rod and the plurality of second outer circumferential bars arranged away from each other in the circumferential direction of the second reinforcing bar rod correspond to each other. The distance between the objects is determined based on the distance between the first core reinforcement inside the first outer periphery of the first reinforcing bar and the second core reinforcement inside the second outer periphery of the second reinforcing bar. In the enlarged state, the second rebar rod is suspended above the first rebar rod,
Next, the first and second core reinforcements are joined together through the core reinforcement joining means,
Thereafter, the corresponding first and second outer peripheral bars are bonded to each other through outer peripheral bar bonding means.
As a result, when the first and second core reinforcing bars are joined together, the first and second outer peripheral bars are vacant, so that the first and second outer peripheral bars are not disturbed by the first, The joining operation of the second core reinforcement can be easily performed.

Here, the second rebar bar is generally arranged in a suspended state above the first rebar bar using lifting means such as a crane. Therefore, the suspended second rebar bar is likely to swing until the first and second core bars are joined together. If it does so, it will become difficult to join the 1st and 2nd core reinforcements, no matter how much space between the 1st and 2nd outer periphery reinforcements.
Therefore, after temporarily fixing or joining the first and second peripheral muscles corresponding to each other selected from the plurality of first and second peripheral muscles, the first and second core bars are connected to each other. It is preferable to perform bonding. Thereby, when joining the first and second core reinforcing bars, it is possible to suppress or prevent the second rebar bar from shaking. As a result, the joining operation of the first and second core bars can be performed more easily. By selecting only a part of the plurality of first and second outer peripheral muscles and temporarily fixing or pre-joining the first and second outer peripheral muscles, the first and second outer peripheral muscles are temporarily and first joined. It is possible to avoid interfering with the joining work between the two core bars.

  After temporarily fixing the selected first and second outer peripheral bars with a temporary fixing device, the first and second core bars are joined to each other, and then the temporary fixing device is removed, It is preferable to join the first and second outer peripheral bars. Thereby, when joining the first and second core reinforcing bars, it is possible to suppress or prevent the second rebar bar from shaking. Therefore, the joining work of the first and second core bars can be performed more easily.

  It is preferable that male screw threads are formed on the outer circumferences of the first and second outer circumference muscles, and the outer circumference muscle joining means includes a cylindrical outer muscle joint having a female ridge on the inner circumference. As the temporary fixing device, a cylindrical temporary fixing joint having an internal thread on the inner periphery and a bar member having an external thread on the outer periphery are prepared, and at the time of the temporary fixing, the selected first and second outer periphery One of the bars, the temporarily fixed joint, the bar, the outer peripheral joint, and the other of the selected first and second outer bars are screw-connected so as to be connected in a row, the first, It is preferable that after the second core bars are connected to each other, the screw connection between the temporarily fixed joint and the one outer peripheral bar is released, and the screw connection between the outer bar joint and the bar is released. Thereby, temporary fixing of the first and second outer peripheral bars can be easily performed by a screwing operation. In addition, the first and second core bars can be easily joined by a screwing operation. Furthermore, the temporary fixing can be easily released by a screwing operation. And after removing a temporary fixing apparatus, a 1st, 2nd outer periphery reinforcement can be easily joined via an outer periphery reinforcement joint by operating a periphery reinforcement joint by screwing. The outer peripheral joint can be used as a second temporary fixing joint when the first and second outer peripheral bars are temporarily fixed. Prior to suspending the second rebar rod, the outer joint is attached to the lower end of the second outer reinforcement or the upper end of the first outer reinforcement, so that the temporary fixing operation can be efficiently performed. .

  In addition, the temporary fixing device according to the present invention includes a first connecting portion that can be attached to and detached from the first outer periphery and a second connecting portion that can be attached to and detached from the second outer periphery. Accordingly, the first and second outer peripheral bars can be temporarily fixed to each other, and the temporary fixing can be easily released after the first and second core bars are joined.

  It is preferable that the first connecting portion and the second connecting portion can be approached and separated along the axial direction of the first and second outer peripheral muscles. As a result, when temporarily fixing, the first and second outer peripheral bars can be securely fixed without having to accurately determine the distance between the corresponding first and second outer peripheral bars. When releasing the temporary fixing, the temporary fixing device can be easily removed from between the first and second outer peripheral bars by reducing the distance between the first and second connecting portions.

  One of the first and second connecting portions is a cylindrical temporary fixed joint having an internal thread on the inner periphery, and the other of the first and second connecting portions has an external thread on the outer periphery. It is preferable that the bar is screwed to the temporary fixing joint. In this case, it is preferable that male threads are formed on the outer circumferences of the first and second outer circumference muscles, and the outer circumference muscle joining means includes a cylindrical outer muscle joint having a female thread on the inner circumference. As a result, the temporarily fixed joint can be screw-coupled to one of the first and second outer peripheral bars. Further, the bar can be screw-coupled to the outer peripheral joint, and the outer joint is screw-coupled to the other of the first and second outer joints, so that the bar and the first, The other of the second outer circumferential bars can be connected. By adjusting the screwing amount of the temporary fixing joint and the bar, the first and second connecting portions can be moved closer to and away from each other.

  According to the present invention, the core bars of the first and second reinforcing bar rods can be joined without being obstructed by the outer peripheral bars. Thereby, the construction work of the reinforcing bar can be facilitated.

FIG. 1 shows a first embodiment of the present invention and is a front view of a reinforcing bar erected body of a column of a reinforced concrete structure part. FIG. 2 is a plan sectional view of the first reinforcing bar rod of the reinforcing bar rod built-in body along the line II-II in FIG. 1. FIG. 3 shows a reinforcing bar erection method according to the first embodiment, FIG. 3 (a) is a front view of a state where the second reinforcing bar is lifted (hanging process), and FIG. FIG. 3C is a front view of a state in which the second reinforcing bar rod is disposed above the first reinforcing rod rod (upper arrangement step), and FIG. 3C is a state in which the first and second core bars are bonded to each other (core reinforcing step). ), And FIG. 3D is a front view of the state where the first and second outer peripheral bars are joined to each other (outer bar joining step). FIG. 4 is a longitudinal sectional view of the temporary fixing device according to the second embodiment of the present invention. FIG. 5 shows a reinforcing bar erection method according to the second embodiment, FIG. 5 (a) is a front view of a state in which the second reinforcing bar is lifted (hanging process), and FIG. It is a front view of the state (upper arrangement process) which has arranged the 2nd rebar rod above the 1st rebar rod, and Drawing 5 (c) temporarily fixed some selected 1st and 2nd outer periphery reinforcements It is a front view which follows a Vc-Vc line | wire of FIG. 6 which shows a state (temporary fixing process). FIG. 6 is a cross-sectional plan view taken along the line VI-VI in FIG. FIG. 7 shows a reinforcing bar erection method according to the second embodiment, and FIG. 7 (a) is a front view of the state where the first and second core reinforcing bars are joined (core reinforcing joint step). (B) is a front view of the state (removal process) which removes a temporary fixing apparatus, FIG.7 (c) is a front view of the state (peripheral reinforcement joining process) which joined the 1st, 2nd outer periphery reinforcement. It is. FIG. 8 shows a reinforcing bar erection method according to the third embodiment, FIG. 8 (a) is a front view of a state where the second reinforcing bar is lifted (hanging process), and FIG. FIG. 8C is a front view of a state in which the second reinforcing bar rod is disposed above the first reinforcing rod rod (upper arrangement step), and FIG. 8C temporarily fixes the selected first and second outer peripheral reinforcing bars. It is a front view which shows a state (temporary fixing process). FIG. 9 is a plan sectional view taken along line IX-IX in FIG. FIG. 10 shows a reinforcing bar erection method according to the third embodiment, and FIG. 10 (a) is a front view of a state in which the first and second core reinforcements are joined together (core reinforcement joining step). (B) is a front view of the state (removal process) which removes a temporary fixing apparatus, FIG.10 (c) is a front view of the state (peripheral reinforcement joining process) which joined the 1st, 2nd outer periphery reinforcement. It is. FIG. 11 shows a reinforcing bar erection method according to the fourth embodiment, FIG. 11 (a) is a front view of a state where the second reinforcing bar is lifted (hanging process), and FIG. It is a front view of the state (upper arrangement process) which has arranged the 2nd reinforcement bar above the 1st reinforcement bar, and Drawing 11 (c) temporarily fixed selected some 1st and 2nd outer periphery reinforcements It is a front view which shows a state (temporary fixing process). FIG. 12 is a plan sectional view taken along line XII-XII in FIG. FIG. 13 shows a reinforcing bar erection method according to the fourth embodiment, and FIG. 13 (a) is a front view of a state in which the first and second core reinforcements are joined together (core reinforcement joining step). (B) is a front view of the state (removal process) which removes a temporary fixing apparatus, FIG.13 (c) is a front view of the state (peripheral reinforcement joining process) which joined the 1st, 2nd outer periphery reinforcement. It is. FIG. 14 shows a reinforcing bar erection method according to the fifth embodiment, FIG. 14 (a) is a front view of a state where the second reinforcing bar is lifted (hanging process), and FIG. It is a front view of the state (upper arrangement process) which has arranged the 2nd rebar rod above the 1st rebar rod, and Drawing 14 (c) joins a part of selected 1st, 2nd outer periphery reinforcement first. It is a front view which shows the state (pre-joining process) which was made. FIG. 15 shows a reinforcing bar erection method according to the fifth embodiment, and FIG. 15 (a) is a front view showing a state where the first and second core reinforcing bars are joined to each other (core reinforcing joint joining step). (B) is a front view of the state (peripheral reinforcement joining process) which joined the 1st and 2nd outer circumference reinforcement.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
1 to 3 show a first embodiment of the present invention. As shown in FIG. 1, the reinforcing bar of the column 1 of the reinforced concrete structure is composed of a reinforcing bar erected body 2. The reinforcing bar erected body 2 includes a plurality of reinforcing bar ridges that are arranged in a line in the vertical direction (up and down). Hereinafter, of the two reinforcing bar rods adjacent in the vertical direction in the reinforcing bar rod built-in body 2, the lower reinforcing rod rod is referred to as “first reinforcing rod rod 10”, and the upper reinforcing rod rod is referred to as “second reinforcing rod rod 20”. .

  As shown in FIGS. 1 and 2, the first reinforcing bar rod 10 includes a plurality of (12 in FIG. 2) first outer peripheral bars 11 and one or a plurality of (four in FIG. 2) first core reinforcing bars 12. And a plurality of first shear reinforcement bars 13. The first outer circumferential bars 11, 11... Extend vertically and are spaced apart from each other in the circumferential direction of the column 1. Inside the first outer periphery 11, the first core 12 is arranged so as to extend vertically. These first outer circumferential bars 11 and first core bars 12 constitute the main bars of the column 1. Hereinafter, the first outer periphery 11 and the first core 12 are collectively referred to as “main muscles 11 and 12”. As shown in FIG. 2, the main muscles 11 and 12 are arranged in lattice points in plan view as a whole.

  Each of the main bars 11 and 12 is formed of a deformed reinforcing bar having screw-like (spiral) flies (projections) 11a and 12a. That is, a male thread 11 a is formed on the outer periphery of the first outer periphery 11. The external thread 11a is provided over the entire length of the first outer periphery 11 at a constant pitch in two regions 180 degrees apart in the circumferential direction of the first outer periphery 11. A portion between the two screw forming regions on the outer periphery of the first outer periphery 11 is a substantially flat portion 11b. As shown by the two-dot chain line in FIG. 1, when the male thread 11a in one screw forming region is virtually extended to the flat portion 11b, the virtual male thread 11ax becomes the male thread 11a in the other screw forming region. It is continuous. Similarly, male threads 12a are formed in two regions 180 degrees apart on the outer periphery of the first core reinforcement 12. A flat portion 12b is formed between these two screw forming regions. The male screw threads 11a and 12a can increase the adhesion of the main bars 11 and 12 to the concrete.

  The first shear reinforcement bars 13, 13... Are wound around the main bars 11, 12 in an annular shape and are arranged apart from each other in the axial direction (vertical direction) of the main bars 11, 12.

  The second reinforcing bar rod 20 has substantially the same structure as the first reinforcing bar rod 10. Specifically, the second reinforcing bar rod 20 includes a plurality (here, twelve) second outer peripheral bars 21, one or a plurality (four here) second core bars 22, and a plurality of second shear reinforcing bars. 23. The second outer circumferential bars 21, 21,... Extend vertically and are spaced apart from each other in the circumferential direction of the column 1. Inside the second outer peripheral bars 21, the second core bars 22 are arranged so as to extend vertically. These second outer circumferential bars 21 and second core bars 22 constitute the main bars of the pillar 1. Hereinafter, the second outer peripheral bars 21 and the second core bars 22 are collectively referred to as “main bars 21 and 22”. The main bars 21 and 22 are arranged in a lattice point in plan view as a whole.

  Each of the main bars 21 and 22 is formed of a deformed reinforcing bar having screw-like (spiral) flies (projections) 21a and 22a. That is, male threads 21 a are formed in two regions 180 degrees apart from the outer periphery of the second outer periphery 21. A flat portion 21b is formed between these two screw forming regions. Male screw threads 22 a are formed in two regions 180 degrees apart on the outer periphery of the second core reinforcement 22. A flat portion 22b is formed between these two screw forming regions. The adhesive force of the main bars 21 and 22 to the concrete can be increased by the male screw threads 21a and 22a.

  The second shear reinforcement bars 23, 23,... Are wound around the main bars 21, 22 in an annular shape and are arranged apart from each other in the axial direction (vertical direction) of the main bars 21, 22.

  As shown in FIG. 1, the 1st outer periphery reinforcement 11 of the 1st reinforcement bar 10 and the 2nd outer periphery reinforcement 21 of the 2nd reinforcement bar 20 correspond one to one. Corresponding outer muscles 11 and 21 are joined in a straight line via the outer circumference joint means 30. The outer periphery reinforcing means 30 includes an outer periphery reinforcing joint 31 and a pair of lock nuts 32 and 33. The outer periphery joint 31 is cylindrical. A female thread 31 a is formed on the inner periphery of the outer peripheral joint 31. A grout hole 31c is formed in the central portion of the outer peripheral joint 31, for example. The grout hole 31 c penetrates from the outer periphery to the inner periphery of the outer periphery joint 31.

  The outer periphery joint 31 is arrange | positioned so that it may straddle between the corresponding outer periphery muscles 11 and 21. FIG. The upper end portion of the first outer peripheral reinforcement 11 is inserted into the lower portion of the outer peripheral joint 31 and the threads 31a and 11a are engaged with each other. The lower end portion of the second outer peripheral reinforcement 21 is inserted into the upper portion of the outer peripheral reinforcement joint 31, and the threads 31a and 21a are engaged with each other. Although detailed illustration is omitted, a sufficient margin (for example, about several mm) in the axial direction is set between the female thread 31a and the male threads 11a and 21a. A grout (not shown) is filled between the inner periphery of the outer peripheral joint 31 and the outer peripheral bars 11 and 21 through the grout hole 31c and solidified.

  A lock nut 32 is screwed into the first outer periphery 11. The lock nut 32 is fastened to the lower end portion of the outer peripheral joint 31. A lock nut 33 is screwed into the second outer periphery 21. The lock nut 33 is fastened to the upper end portion of the outer peripheral joint 31. By filling and solidifying the grout and tightening the lock nuts 32 and 33, the corresponding outer peripheral bars 11 and 21 are connected to each other so that the tensile force can be reliably transmitted.

  Similarly, the 1st core reinforcement 12 of the 1st rebar rod 10 and the 2nd core reinforcement 22 of the 2nd reinforcement rod 20 correspond one to one. Corresponding core reinforcements 12 and 22 are joined in a straight line via the core reinforcement joining means 40. The core reinforcing joint means 40 includes a core reinforcing joint 41 and a pair of lock nuts 42 and 43. The core joint 41 is cylindrical. On the inner periphery of the core reinforcement joint 41, a female thread 41a is formed. A grout hole 41c is formed in the central portion of the core joint 41, for example. The grout hole 41 c penetrates from the outer periphery to the inner periphery of the core reinforcement joint 41.

  The core reinforcing joint 41 is disposed so as to straddle between the corresponding core reinforcing bars 12 and 22. The upper end portion of the first core reinforcement 12 is inserted into the lower part of the core reinforcement joint 41, and the threads 41a and 12a are engaged with each other. The lower end portion of the second core reinforcement 22 is inserted into the upper portion of the core reinforcement joint 41, and the threads 41a and 22a are engaged with each other. Although detailed illustration is omitted, a sufficient margin (for example, about several mm) in the axial direction is set between the female screw thread 41a and the male screw threads 12a and 22a. A grout (not shown) is filled between the inner periphery of the core reinforcing joint 41 and the core reinforcing bars 12 and 22 through the grout hole 41c and solidified.

A lock nut 42 is screwed into the first core reinforcement 12. The lock nut 42 is fastened to the lower end portion of the core reinforcement joint 41. A lock nut 43 is screwed into the second core bar 22. The lock nut 43 is fastened to the upper end portion of the core reinforcement joint 41. Corresponding core bars 12 and 22 are connected to each other so that the tensile force can be reliably transmitted by filling and solidifying the grout and tightening the lock nuts 42 and 43.
As a result, the main bars 11, 12, 21, and 22 of the reinforcing bar erected body 2 can reliably bear the tensile strength of the column 1.

The above-mentioned reinforcing bar erected body 2 is constructed as follows.
Reinforcing rods 10 and 20 are assembled in advance at a factory or the like and are carried to a construction site of a reinforced concrete structure. Pre-assembly may be performed at the construction site. Then, a plurality of reinforcing bar rods are sequentially built from the bottom so that the second reinforcing bar rods 20 are added above the first reinforcing bar rods 10 that have already been built.

The method for building the second rebar rod 20 will be described in further detail.
[pre-process]
When the second reinforcing bar rod 20 is pre-assembled, the second core bar 22 is movable in the axial direction (up and down) with respect to the second outer peripheral bar 21 and the second shear reinforcement bar 23. Specifically, the second outer peripheral reinforcement 21 and the second shear reinforcement 23 are tightly bound, while the second core reinforcement 22 and the second shear reinforcement 23 are loosely bound or not bound. To.
Instead of this, the second core reinforcement 22 and the second shear reinforcement 23 are tightly bound, while the second outer peripheral reinforcement 21 and the second shear reinforcement 23 are loosely bound or not bound. Good.

  Further, as shown in FIG. 3A, a hanging jig 50 for the second rebar rod 20 is prepared. The hanging jig 50 has, for example, a plate shape that covers the upper end portion of the second reinforcing bar rod 20. Insertion holes 51 are formed at a plurality of locations corresponding to the main bars 21 and 22 of the hanging jig 50. The upper end portions of the corresponding main bars 21 and 22 are inserted into the respective insertion holes 51. Then, a nut 52 (stopper) is screwed into a portion above the hanging jig 50 of each main reinforcement 21, 22. The nut 52 has a larger diameter than the insertion hole 51. At this time, the nut 52 of the second outer periphery 21 is screwed deeper than the nut 52 of the second core 22 so that the distance from the uppermost end of the second outer periphery 21 to the nut 52 is increased. The distance from the upper end to the nut 52 is made larger.

  Nuts 33 and 43 and joints 31 and 41 are sequentially screwed into the lower ends of the main bars 21 and 22 of the second reinforcing bar rod 20.

  As shown in FIG. 3B, the upper ends of the main bars 11 and 12 of the built-in first reinforcing bar rod 10 are aligned at substantially the same height. Nuts 32 and 42 are screwed into the upper ends of the main bars 11 and 12, respectively.

[Hanging process]
As shown in FIG. 3A, a suspension rope 3 of a crane (not shown) is connected to the suspension jig 50. Then, the hanging jig 50 is lifted horizontally by the crane. Then, the main reinforcing bars 21 and 22 of the second reinforcing bar rod 20 are almost vertical, the nut 52 of the second outer peripheral bar 21 is hooked on the hanging jig 50, and the second core bar 22 is further against the second outer peripheral bar 21. The nut 52 of the second core reinforcement 22 is caught by the hanging jig 50. By these catches, the main bars 21 and 22 and the second reinforcing bar rod 20 are supported in a state of being hung from the hanging jig 50. At this time, the second outer peripheral muscle 21 is positioned higher than the second core reinforcement 22 by the amount that the nut 52 of the second outer peripheral reinforcement 21 is screwed deeper than the nut 52 of the second core reinforcement 22. As a result, the lower end portion of the second outer circumferential bar 21 is positioned higher than the lower end portion of the second core bar 22.

[Upper placement process]
As shown in FIG. 3 (b), the crane is further operated to place the lifted second rebar rod 20 above the built-in first rebar rod 10. As shown in FIG. Then, the peripheral reinforcing bars 11 and 21 corresponding to each other of the first reinforcing bar rod 10 and the second reinforcing bar rod 20 and the core reinforcing bars 12 and 22 corresponding to each other are opposed to each other vertically. In this case, the distance _{L 1} between and if the outer peripheral muscle 11 and 21 corresponding to each other, is larger than the distance _{L 2} between and concentric muscle 12, 22 corresponding to each other _{(L 1> L} 2).

[Core reinforcement joining process]
Next, as shown in FIG. 3C, the corresponding core muscles 12 and 22 are joined together through the core muscle joining means 40. Specifically, the core reinforcement joint 41 at the lower end portion of the second core reinforcement 22 is rotated in the descending direction, and the lower half of the core reinforcement joint 41 is screwed into the outer periphery of the upper end portion of the first core reinforcement 12. The muscle joint 41 is extended from the second core muscle 22 to the first core muscle 12. Then, the pair of upper and lower lock nuts 43, 42 are tightened toward the core reinforcement joint 41. At this time, since the space between the upper end portion of the first outer periphery muscle 11 and the lower end portion of the second outer periphery muscle 21 is large, the joining operation of the core muscles 12 and 22 can be performed without being disturbed by the outer periphery muscles 11 and 21. It can be done easily.

[Peripheral muscle joining work]
Next, as shown in FIG. 3D, the crane is operated to lower the suspension jig 50. Then, the second core reinforcement 22 remains at the same height, while the second outer peripheral reinforcement 21 and the second shear reinforcement 23 are lowered integrally with the hanging jig 50. As a result, the second outer circumferential bars 21 and the second core bars 22 are aligned at substantially the same height. Subsequently, the corresponding outer peripheral muscles 11 and 21 are joined to each other through the outer peripheral muscle joining means 30. Specifically, the outer peripheral reinforcing joint 31 at the lower end of the second outer peripheral rebar 21 is rotated in the descending direction, and the lower half of the outer peripheral reinforcing joint 31 is screwed into the outer periphery of the upper end of the first outer peripheral rebar 11 to The muscle joint 31 is straddled from the second outer circumferential muscle 21 to the first outer circumferential muscle 11. Then, the pair of upper and lower lock nuts 33 and 32 are tightened toward the outer peripheral joint 31, respectively. In this way, the second rebar rod 20 can be built above the first rebar rod 10.

[Post-process]
Thereafter, the nut 52 is removed from the upper ends of the main bars 21 and 22. And the said jig | tool is operated and the suspension jig | tool 50 is removed from the 2nd reinforcing bar rod 20 by raising rather than the main reinforcements 21 and 22. FIG.

[Additional process of next-stage rebar bar]
Next, the second reinforcing bar rod 20 is set as a built-in reinforcing rod rod, and a new reinforcing rod rod is built thereon in the same procedure as described above. By repeating this, the reinforcing bar erected body 2 of the pillar 1 can be constructed.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings to simplify the description of the same configurations as those already described.
Second Embodiment
4 to 7 show a second embodiment of the present invention. As shown in FIG. 4, in the second embodiment, a temporary fixing device 60 is used when the second rebar bar 20 is built. The temporary fixing device 60 includes a temporary fixing joint 61 (first connecting portion) and a bar 62 (second connecting portion). The temporarily fixed joint 61 is cylindrical. A female thread 61 a is formed on the inner periphery of the temporary fixing joint 61.

  The bar 62 has a short linear shape. The bar 62 is composed of a deformed bar having the same shape as the main bars 11, 12, 21, and 22 except that the bar 62 is considerably shorter than the main bars 11, 12, 21, and 22. That is, male threads 62 a are formed in two regions 180 degrees apart on the outer periphery of the bar 62. The outer periphery of the bar 62 between these two screw forming regions is a flat portion 62b.

  In FIG. 4, the temporary fixing joint 61 is shorter than the bar 62, but these members 61, 62 may have the same length, and the temporary fixing joint 61 may be longer than the bar 62.

  The lower end of the bar 62 is screwed into the upper part of the temporary fixed joint 61. The axial length of the entire temporary fixing device 60 can be adjusted by this screwing amount. Although not shown in detail, a sufficient margin (for example, about several mm) in the axial direction is provided between the female thread 61a of the temporary fixing joint 61 and the male thread 62a of the bar 62. ing.

In the second embodiment, a method of building the second reinforcing bar rod 20 above the built-in first reinforcing bar rod 10 will be described.
[pre-process]
When the second reinforcing bar rod 20 is pre-assembled, the second core reinforcing bar 22 is changed to the second outer peripheral reinforcing bar 21 by adjusting the binding degree of the second shear reinforcing bar 23 as in the first embodiment (FIG. 3). On the other hand, it is movable in the axial direction (up and down). Specifically, the second outer peripheral reinforcement 21 and the second shear reinforcement 23 are tightly bound, while the second core reinforcement 22 and the second shear reinforcement 23 are loosely bound or not bound. . Instead of this, the second core reinforcement 22 and the second shear reinforcement 23 are tightly bound, while the second outer peripheral reinforcement 21 and the second shear reinforcement 23 are loosely bound or not bound. Good.

Further, as shown in FIG. 5A, the upper ends of the main bars 21 and 22 are passed through the insertion holes 51 of the hanging jig 50, and the nut 52 is located above the hanging jig 50 of the main bars 21 and 22. Screw into the part. At this time, the nut 52 of the second outer periphery 21 is screwed deeper than the nut 52 of the second core 22 so that the distance from the uppermost end of the second outer periphery 21 to the nut 52 is increased. The distance from the upper end to the nut 52 is made larger.
Nuts 33 and 43 and joints 31 and 41 are sequentially screwed into the lower ends of the main bars 21 and 22 of the second reinforcing bar rod 20.
Nuts 32 and 42 are screwed into the upper ends of the main bars 11 and 12 of the first reinforcing bar rod 10 that has already been built.

[Hanging process]
As shown to Fig.5 (a), the lifting jig | tool 50 is lifted horizontally with a crane. Then, the main reinforcing bars 21 and 22 of the second reinforcing bar rod 20 are almost vertical, the nut 52 of the second outer peripheral bar 21 is hooked on the hanging jig 50, and the second core bar 22 is further against the second outer peripheral bar 21. The nut 52 of the second core reinforcement 22 is caught by the hanging jig 50. By these catches, the main bars 21 and 22 and the second reinforcing bar rod 20 are supported in a state of being hung from the hanging jig 50. At this time, the second outer peripheral muscle 21 is positioned higher than the second core reinforcement 22 by the amount that the nut 52 of the second outer peripheral reinforcement 21 is screwed deeper than the nut 52 of the second core reinforcement 22. As a result, the lower end portion of the second outer circumferential bar 21 is positioned higher than the lower end portion of the second core bar 22.

[Upper placement process]
As shown in FIG.5 (b), the said crane is further operated and the said 2nd rebar rod 20 lifted is arrange | positioned above the built-in 1st rebar rod 10. FIG. Then, the peripheral reinforcing bars 11 and 21 corresponding to each other of the first reinforcing bar rod 10 and the second reinforcing bar rod 20 and the core reinforcing bars 12 and 22 corresponding to each other are opposed to each other vertically. In this case, the distance _{L 1} between and if the outer peripheral muscle 11 and 21 corresponding to each other, is larger than the distance _{L 2} between and concentric muscle 12, 22 corresponding to each other _{(L 1> L} 2).

[Temporary fixing process]
Next, as shown in FIG. 5C, a part of the outer peripheral bars 11 and 21 are selected from the first and second outer bars 11 and 21 corresponding to each other of the first and second reinforcing bar rods 10 and 20. Then, the selected corresponding peripheral muscles 11 and 21 are temporarily fixed by the temporary fixing device 60. Preferably, as shown in FIG. 6, the outer peripheral bars 11E and 21E at the four corners of the reinforcing bar rods 10 and 20 are selected, and the lower end part of the second outer peripheral bar 21E is temporarily attached to the upper end part of the first outer bar 11E. Temporarily fix via Specifically, the temporary fixing joint 61 is turned in the descending direction, and the lower end portion thereof is screwed into the outer periphery of the upper end portion of the first outer peripheral reinforcement 11E, so that the temporary fixing joint 61 is straddled from the bar 62 to the first outer peripheral reinforcement 11E. Make it. The temporarily fixed joint 61 constitutes a “first connecting portion” that is detachably connected to one of the outer peripheral reinforcing bars 11. Further, the outer peripheral joint 31 at the lower end of the second outer peripheral joint 21E is rotated in the descending direction, and the lower portion of the outer peripheral joint 31 is screwed into the outer periphery of the upper end of the bar 62, thereby It extends over the bar 62 from the second outer periphery 21E. The bar 62 constitutes a “second coupling portion” that is detachably coupled to the other outer circumferential bar 21 via the outer circumferential bar joint 31. In short, the second outer peripheral reinforcement 21E, the outer peripheral reinforcement joint 31, the bar 62, the temporary fixing joint 61, and the first outer periphery reinforcement 11E are screw-coupled so as to be lined up and down. Thereby, the swing of the 2nd rebar rod 20 of a suspended state can be suppressed or prevented.

In the temporary fixing step, there is no need to tighten the lock nuts 32 and 33.
Further, in the above-described pre-process, the temporary fixing device 60 is attached in advance to the upper end portion of the first outer circumferential reinforcement 11E, and only the connection between the second outer circumferential reinforcement 21E and the temporary fixing device 60 is performed in the temporary fixing process. Also good. Alternatively, in the previous step, the temporary fixing device 60 may be attached in advance to the lower end portion of the second outer circumferential bar 21E, and only the connection between the first outer circumferential bar 11E and the temporary fixing device 60 may be performed in the temporary fixing step. .

[Core reinforcement joining process]
Next, as shown in FIG. 7A, the corresponding core muscles 12 and 22 are joined together through the core muscle joining means 40. That is, the core reinforcement joint 41 at the lower end portion of the second core reinforcement 22 is rotated in the descending direction, and the lower half of the core reinforcement joint 41 is screwed into the outer periphery of the upper end portion of the first core reinforcement 12. The joint 41 extends from the second core muscle 22 to the first core muscle 12. Then, the pair of upper and lower lock nuts 42 and 43 are tightened toward the core reinforcement joint 41, respectively. At this time, since there is a large space between the corresponding outer peripheral bars 11 and 21 other than the four corners, the core bars 12 and 22 can be easily joined without being obstructed by the outer peripheral bars 11 and 21. In addition, since the second rebar bar 20 is temporarily fixed, shaking is suppressed or prevented, so that the joining operation of the core bars 12 and 22 can be performed more easily. The temporary fixing device 60 joins the core muscles 12 and 22 by selecting only the outer peripheral muscles 11E and 21E at the four corners (part) from the plurality of outer peripheral muscles 11 and 21 and temporarily fixing them with the temporary fixing device 60. You can avoid getting in the way of work.

[Removal process]
Next, as shown in FIG. 7B, the temporary fixing device 60 is removed. Specifically, the screw connection between the outer peripheral joint 31 and the bar 62 is released by turning the outer joint 31 of the second outer joint 21E in the upward direction. And the screw coupling of the temporary fixed joint 61 and the 1st outer periphery 11E is cancelled | released by turning the temporary fixed joint 61 to a raise direction. Thereby, the axial length of the entire temporary fixing device 60 (the length from the upper end of the bar 62 to the lower end of the temporary fixing joint 61) is between the lower end of the second outer circumferential bar 21E and the upper end of the first outer bar 11E. Shorter than the distance. Therefore, the temporary fixing device 60 can be easily removed from between the outer peripheral bars 21E and 11E.

[Peripheral muscle joining work]
Next, as shown in FIG. 7C, the crane is operated to lower the hanging jig 50. Then, the second core reinforcement 22 remains at the same height, while the second outer peripheral reinforcement 21 and the second shear reinforcement 23 are lowered integrally with the hanging jig 50. As a result, the second outer circumferential bars 21 and the second core bars 22 are aligned at substantially the same height. Subsequently, the corresponding outer circumferential muscles 11 and 21 (including the selected outer circumferential muscles 11E and 21E) are joined via the outer circumference muscle joining means 30. That is, the outer peripheral reinforcement 31 at the lower end of the second outer periphery 21 is rotated in the downward direction, and the lower half of the outer periphery joint 31 is screwed into the outer periphery of the upper end of the first outer periphery 11, thereby The joint 31 is extended from the second outer periphery 21 to the first outer periphery 11. Then, the pair of upper and lower lock nuts 32 and 33 are tightened toward the outer peripheral joint 31, respectively. In this way, the second rebar rod 20 can be built above the first rebar rod 10.

[Post-process]
Thereafter, the nut 52 is removed from the upper ends of the main bars 21 and 22. And the said jig | tool is operated and the suspension jig | tool 50 is removed from the 2nd reinforcing bar rod 20 by raising rather than the main reinforcements 21 and 22. FIG.

[Additional process of next-stage rebar bar]
Next, the second reinforcing bar rod 20 is set as a built-in reinforcing rod rod, and a new reinforcing rod rod is built thereon in the same procedure as described above. By repeating this, it is possible to construct the column reinforcing bar erected body 2.

<Third Embodiment>
8 to 10 show a third embodiment of the present invention. As shown to Fig.8 (a), the clamp 53 is provided in the hanging jig | tool 50 in 3rd Embodiment. The clamp 53 holds the upper end portion of the second outer circumferential muscle 21. There is no need to form the insertion hole 51 in the hanging jig 50.

  Further, as shown in FIG. 9, a plate-like hooking member 54 is prepared. The area of the hook member 54 is smaller than the entire cross section of the second reinforcing bar rod 20 and larger than the cross section of the core reinforcing bar arrangement region of the second reinforcing bar rod 20. A plurality of insertion holes 55 are formed in the hooking member 54. These insertion holes 55 correspond one-to-one with the second core reinforcement 22. The upper end portion of each second core bar 22 is passed through the corresponding insertion hole 55. A nut 52 is screwed into a portion above the insertion hole 55 of each second core bar 22. The nut 52 has a larger diameter than the insertion hole 55.

  In the third embodiment, as shown in FIG. 8A, when the lifting jig 50 is lifted horizontally by a crane (hanging process), the second outer periphery 21 is supported in a state of being hung from the clamp 53. Is done. Further, as shown in the two-dot chain line of FIG. 8A and FIG. 9, the hooking member 54 is the uppermost part of the second shear reinforcing bars 23 bound to the second outer peripheral bars 21 and the second core bars 22. It is caught horizontally by the core muscle 23C (shear reinforcement) passing by the side of and is supported horizontally. Further, the second core bar 22 descends with respect to the second outer peripheral bar 21, and the nut 52 is hooked on the hook member 54. By this hooking, the second core reinforcement 22 is supported in a suspended state. At this time, the lower end of the second core bar 22 is located below the lower end of the second outer peripheral bar 21. Therefore, as shown in FIG. 8B, if the second reinforcing bar rod 20 is arranged above the first reinforcing bar rod 10, the distance between the outer reinforcing bars 21 and 11 is greater than the distance between the core bars 22 and 12. Increased (upward placement step).

  Next, as shown in FIG. 8C, the outer peripheral bars 21E and 11E at the four corners (selected portions) are temporarily fixed by the temporary fixing device 60 (temporary fixing step). Thereby, the shaking of the 2nd reinforcing bar rod 20 can be suppressed or prevented.

  Subsequently, as shown in FIG. 10A, the corresponding core reinforcing bars 22 and 12 are bonded to each other by the core reinforcing bonding means 40 (core reinforcing bonding step). At this time, since there is a large space between the corresponding outer peripheral bars 11 and 21 other than the four corners, the core bars 12 and 22 can be easily joined without being obstructed by the outer peripheral bars 11 and 21. In addition, since the second rebar bar 20 is temporarily fixed, shaking is suppressed or prevented, so that the joining operation of the core bars 12 and 22 can be performed more easily. By selecting only the outer peripheral muscles 11E and 21E at the four corners (part) from the plurality of outer peripheral reinforcing bars 11 and 21 and temporarily fixing them with the temporary fixing device 60, the temporary fixing device 60 can be connected between the core reinforcing bars 12 and 22. It is possible to avoid interfering with the joining work.

  Next, as shown in FIG.10 (b), the temporary fixing apparatus 60 is removed (removal process).

  Next, as shown in FIG. 10 (c), the hanging jig 50 is lowered to lower the second outer circumferential bars 21, and the corresponding outer circumferential bars 21, 11 are joined by the outer circumferential bar joining means 30 (outer circumference). Muscle joining process).

<Fourth embodiment>
11 to 13 show a fourth embodiment of the present invention. As shown in FIGS. 11A and 12, in the fourth embodiment, when the second rebar rod 20 is pre-assembled, an intermediate portion of a plurality of (four in FIG. 12) second core bars 22 is assisted. The hoop muscle 26 (shear reinforcement) is wound. The second core muscle 22 and the auxiliary hoop muscle 26 are tightly bound. The auxiliary hoop muscle 26 is located on the inner side of the second outer periphery muscle 21 and is separated from the second outer periphery muscle 21. The second outer peripheral bars 21 and the second core bars 22 can be moved relative to each other in the axial direction by increasing or decreasing the degree of binding, as in the embodiment described above.

  A hook 56 is also prepared. The hook 56 is made of a steel material that is slightly larger than the length of one side of the second reinforcing bar rod 20. The hook 56 is inserted into a portion of the second reinforcing bar rod 20 below the auxiliary hoop bar 26 in a direction perpendicular to the axis of the second reinforcing bar rod 20. In this embodiment, the hook rod 56 is inserted between the lowermost second shear reinforcing bar 23 of the second reinforcing bar rod 20 and the second upper shear reinforcing bar 23 immediately above the second shear reinforcing bar 23, and the lowermost second shear reinforcing bar 23. 23, the both ends of the hooking rod 56 are placed.

  In 4th Embodiment, as shown to Fig.11 (a), after holding the upper end part of the 2nd outer periphery muscle 21 with the clamp 53 similar to 3rd Embodiment (FIG. 8), the hanging jig | tool 50 is carried out with the crane. Is horizontally lifted (suspending step), the second outer circumferential muscle 21 is supported in a state of being suspended from the clamp 53. Further, as shown in the two-dot chain line of FIG. 11A and FIG. 12, the second core muscle 22 descends with respect to the second outer peripheral muscle 21, and the auxiliary hoop muscle 26 integrated with the second core muscle 22. Is caught by the hook 56. The second core 22 is supported by this catch. At this time, the lower end of the second core reinforcement 22 is positioned below the lower end of the second outer periphery reinforcement 21. Therefore, as shown in FIG. 11 (b), if the second reinforcing bar rod 20 is arranged above the first reinforcing bar rod 10, the distance between the outer circumferential bars 21 and 11 is greater than the distance between the core bars 22 and 12. Increased (upward placement step).

  Next, as shown in FIG. 11C, the outer peripheral bars 21E and 11E at the four corners (selected portions) are temporarily fixed by the temporary fixing device 60 (temporary fixing step). Thereby, the shaking of the 2nd reinforcing bar rod 20 can be suppressed or prevented.

  Subsequently, as shown in FIG. 13A, the corresponding core reinforcing bars 22, 12 are bonded by the core reinforcing bonding means 40 (core reinforcing bonding step). At this time, since the space between the outer peripheral bars 11 and 21 other than the four corners is large, the joining work of the core bars 12 and 22 can be easily performed without being obstructed by the outer peripheral bars 11 and 21. In addition, since the second rebar bar 20 is temporarily fixed, shaking is suppressed or prevented, so that the joining operation of the core bars 12 and 22 can be performed more easily. By selecting only the outer peripheral muscles 11E and 21E at the four corners (part) from the plurality of outer peripheral reinforcing bars 11 and 21 and temporarily fixing them with the temporary fixing device 60, the temporary fixing device 60 can be connected between the core reinforcing bars 12 and 22. It is possible to avoid interfering with the joining work.

Next, as shown in FIG. 1 3 (b), the temporary fixing device 60 is removed (removal step). Further, the hooking rod 56 is pulled out from the second reinforcing bar rod 20 and removed.

Next, as shown in FIG. 1 3 (c), the hanging jig 50 is lowered to lower the second outer periphery 21 and the corresponding outer periphery 21, 21 is joined by the outer periphery joining means 30 ( Peripheral muscle joining process).

<Fifth Embodiment>
14 and 15 show a fifth embodiment of the present invention. As shown in FIG. 14A, in the fifth embodiment, the length of the second outer circumferential bar 21 of the second reinforcing bar rod 20 is shorter than the second core bar 22. As shown in FIG. 15 (b), the corresponding first and second outer peripheral bars 11, 21 of the reinforcing bar rods 10, 20 are connected via a relay bar 71. The relay bar 71 is slightly shorter than the difference between the length of the second core bar 22 and the length of the second outer peripheral bar 21. The relay bars 71 are preferably made of the same type of reinforcing bars as the main bars 11, 21, 12, 22 and male threads (not shown) are formed on the outer periphery thereof. The lower end portion of the second outer peripheral reinforcement 21 and the upper end portion of the relay reinforcement 71 are joined via the outer peripheral joint 31. Lock nuts 33 and 73 are fastened to both ends of the outer joint 31. Furthermore, the lower end of the relay bar 71 and the upper end of the first outer bar 11 are joined via the outer joint 37 having the same structure as the outer joint 31. Lock nuts 72 and 32 are fastened to both ends of the outer joint 37.

In the previous step, when the second reinforcing bar rod 20 is pre-assembled, the lower ends of the second rebars 22 are aligned with the second outer periphery by aligning the heights of the upper ends of the second outer rebars 21 and the second rebars 22. It extends below the lower end of the line 21. In addition, by firmly binding the second shear reinforcing bar 23 to the second outer peripheral bar 21 and the second core bar 22, the second outer bar 21 and the second core bar can be started from the stage of the second rebar bar 20 assembling. 22 so as not to move freely relative to each other. Further, the lock nut 33 and the outer joint 31 are sequentially screwed into the lower ends of the second outer reinforcing bars 21, and the lock nut 43 and the core reinforcing joint 41 are sequentially screwed into the lower ends of the second core bars 22. Further, the lock nut 32 and the outer peripheral joint 37 are sequentially screwed into the upper end portions of the first outer peripheral bars 11 of the first reinforcing bar rod 10 that has already been built. Only the lock nut 42 is screwed into the upper end portion of the first core reinforcement 12. Further, as shown in FIG. 14B, lock nuts 72 and 73 are screwed into both ends of the relay joint 71.
Note that the outer peripheral joint 37 may be screwed into the relay joint 71 instead of the outer peripheral joint 11.

  As shown in FIG. 14A, when the second reinforcing bar rod 20 is built above the first reinforcing bar rod 10, the upper end of the second outer circumferential bar 21 is clamped by the same clamp 53 as in the third embodiment (FIG. 8). After gripping the part, the hanging jig 50 is lifted by a crane (hanging step). Accordingly, the second reinforcing bar rod 20 is supported in a state of being hung from the hanging jig 50. At this time, the lower end of the second outer rebar 22 is positioned below the lower end of the second outer rebar 21 by the difference between the length of the second outer rebar 21 and the length of the second core 22. Therefore, as shown in FIG. 14 (b), if the second reinforcing bar rod 20 is arranged above the first reinforcing bar rod 10 (upper arrangement step), the distance between the corresponding outer circumferential bars 21, 11 corresponds. It becomes larger than the distance between the core bars 22 and 12.

  In the fifth embodiment, the joining timing differs depending on the outer circumferential bars 11 and 21. As shown in FIG. 14 (c), the outer peripheral bars 11E and 21E at the four corners (selected portions) of the reinforcing bar rods 10 and 20 are after the above upper arrangement process and more than the joining process of the core bars 22 and 12. Join first (pre-joining step). Specifically, the relay reinforcement 71E is inserted between the corresponding outer periphery reinforcements 21E and 11E, and the second outer periphery reinforcement 21E, the relay reinforcement 71E, and the first outer periphery reinforcement 11E are aligned vertically. Subsequently, the outer peripheral reinforcement joint 31 of the second outer periphery reinforcement 21E is turned in the descending direction so as to straddle the second outer periphery reinforcement 21E over the relay reinforcement 71E. Moreover, the outer periphery reinforcement joint 37 of the 1st outer periphery reinforcement 11E is turned to an up direction, and is straddled from the 1st outer periphery reinforcement 11E to the relay reinforcement 71E. Thereby, the shaking of the 2nd reinforcing bar rod 20 can be suppressed or prevented.

At this stage, it is not necessary to fasten the lock nuts 33 and 73 to both ends of the outer peripheral joint 31 of the second outer peripheral bar 21E. Further, it is not necessary to tighten the lock nuts 72 and 32 at both ends of the outer periphery joint 37 of the first outer periphery 11E. Accordingly, the outer peripheral bars 21E and 11E are temporarily fixed. The pre-joining step substantially corresponds to the temporary fixing step of the embodiment described above.
Note that, in the pre-joining step, lock nuts 33 and 73 may be fastened to both ends of the outer peripheral reinforcing joint 31 of the second outer peripheral reinforcing member 21E. In addition, the lock nuts 72 and 32 may be fastened to both ends of the outer periphery joint 37 of the first outer periphery 11E.

  Next, as shown in FIG. 15A, the corresponding core reinforcements 22 and 12 are joined by the core reinforcement joining means 40 (core reinforcement joining step). At this time, since there is a large space between the corresponding outer peripheral bars 11 and 21 other than the four corners, the core bars 12 and 22 can be easily joined without being obstructed by the outer peripheral bars 11 and 21. Moreover, since the outer reinforcing bars 11E and 21E at the four corners are joined together, the shaking of the second rebar bar 20 is suppressed or prevented, so that the joining work of the core bars 12 and 22 can be performed more easily. it can. By selecting only the outer peripheral muscles 11E and 21E at the four corners (part) from among the outer peripheral reinforcing bars 11 and 21, and joining (temporarily fixing) them first with the relay reinforcement 71E, the relay reinforcement 71E becomes the core reinforcement 12, It is possible to avoid interfering with the joining work between the two.

  Next, as shown in FIG. 15B, the outer peripheral bars 21 and 11 other than the four corners are bonded to each other via the relay bar 71 (outer bar connecting step). Specifically, the relay bar 71 is inserted between the corresponding outer peripheral bars 21 and 11, and the second outer bar 21, the relay bar 71, and the first outer bar 11 are aligned in a vertical line. Subsequently, the outer peripheral reinforcement 31 of the second outer periphery 21 is rotated in the descending direction so as to straddle the second outer periphery 21 to the relay reinforcement 71. Then, the lock nuts 33 and 73 are fastened to both ends of the outer peripheral joints 31 of all the second outer peripheral bars 21 including the second outer peripheral bars 21E at the four corners. Moreover, the outer periphery reinforcement joint 37 of the 1st outer periphery reinforcement | strut 11 is turned to a raise direction, and is straddled from the 1st outer periphery reinforcement | strut 11 to the relay reinforcement 71. FIG. Then, the lock nuts 72 and 32 are fastened to both ends of the outer peripheral joints 37 of all the first outer peripheral bars 11 including the first outer peripheral bars 11E at the four corners.

  In the fifth embodiment, since the outer reinforcing bars 11E and 21E are temporarily fixed or pre-joined using the relay bar 71E for main bonding, the step of removing the temporary fixing device is not necessary.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the temporary fixing step (pre-joining step), it is not necessary to temporarily fix (pre-join) all the outer corner bars 11E and 21E at the four corners, but the outer corner bars 11E and 21E at one to three corners among the four corners. Only temporary fixing (pre-joining) may be performed. Further, the outer peripheral bars 11 and 21 to be temporarily fixed (tip-joined) are not limited to the four corners of the reinforcing bar rods 10 and 20, and the outer peripheral bars 10 and 20 near the center of each side of the reinforcing bar rods 10 and 20 are temporarily fixed. (Pre-joining) may be performed.

  By positioning the upper end of the first outer periphery 11 of the lower first reinforcing bar rod 10 below the upper end of the first core 12, the distance between the outer periphery 11, 21 is between the cores 12, 22. You may make it become larger than the distance between.

In the temporary fixing step, the position of the temporary fixing device 60 is turned upside down from that of the second to fourth embodiments, the bar 62 is connected to the first outer peripheral reinforcement 11 via the outer peripheral reinforcing joint 31, and the temporary fixing joint 61 is connected. May be connected to the second outer periphery 21. In this case, the bar 62 constitutes the “first connecting portion”, and the temporarily fixed joint 61 constitutes the “second connecting portion”. In this case, it is preferable that the outer peripheral reinforcing joint 31 is attached to the upper end portion of the first outer peripheral reinforcing rod 11 in the previous step.
The temporary fixing device does not necessarily need to be the screw members 61 and 62. For example, the 1st connection part of a temporarily fixing apparatus may be the 1st clamp which hold | grips the 1st outer periphery muscle 11 releasably. The 2nd connection part may be the 2nd clamp which grasps the 2nd perimeter muscle 21 releasably. Furthermore, even if the temporary fixing device has a rod-shaped main body with the axis line directed up and down, the first clamp is provided at the lower end portion of the main body, and the second clamp is provided at the upper end portion of the main body. Good.

  The present invention is applicable to construction of a building / civil engineering structure.

DESCRIPTION OF SYMBOLS 1 Pillar 2 Reinforcement rod built-in body 3 Crane suspension rope 10 1st reinforcement rod 11 1st outer periphery 11E Four corners (selected) 1st outer periphery 11a Male thread 11b Flat part 12 1st core 12a Male thread Mountain 12b Flat portion 13 First shear reinforcing bar 20 Second rebar bar 21 Second outer circumferential bar 21E Four (selected) second outer circumferential bars 21a Male thread 21b Flat part 22 Second core bar 22a Male thread 22b Flat Part 23 Second shear reinforcement bar 23C Core bar 26 Auxiliary hoop bar 30 Outer bar joint means 31 Outer bar joint 31a Female thread 31c Grout hole 32 Lower lock nut 33 Upper lock nut 37 Outer bar joint 40 Core bar joint means 41 Core Muscle joint 41a Female thread 41c Grout hole 42 Lower lock nut 43 Upper lock nut 50 Lifting jig 51 Insertion hole 52 Nut (stopper)
53 Clamp 54 Hooking member 55 Insertion hole 56 Hooking rod 60 Temporary fixing device 61 Temporary fixing joint (first connecting portion)
61a Female thread 62 Bar material (second connecting part)
62a Male thread 62b Flat portion 71 Relay bar 71E Selected joint bar

Claims (4)

When building a column of a reinforced concrete structure, a reinforcing bar construction method in which a second reinforcing bar is built above the built-up first reinforcing bar,
The plurality of first outer circumferential bars arranged away from each other in the circumferential direction of the first reinforcing bar rod and the plurality of second outer circumferential bars arranged away from each other in the circumferential direction of the second reinforcing bar rod correspond to each other. The distance between the objects is determined based on the distance between the first core reinforcement inside the first outer periphery of the first reinforcing bar and the second core reinforcement inside the second outer periphery of the second reinforcing bar. In the enlarged state, the second rebar rod is suspended above the first rebar rod,
Next, the first and second core reinforcements are joined together through the core reinforcement joining means,
Thereafter, the corresponding first and second outer peripheral muscles are joined to each other via the outer circumference muscle joining means ,
Moreover, after temporarily fixing a part of the first and second outer peripheral bars corresponding to each other selected from the plurality of first and second outer peripheral bars, the first and second core bars are joined to each other.
In addition, the first and second outer peripheral reinforcing bars selected are temporarily fixed with a temporary fixing device, the first and second core reinforcing bars are joined, and then the temporary fixing device is removed. A method for laying a reinforcing bar rod , comprising joining the first and second outer peripheral bars. Male thread is formed on the outer circumference of the first and second outer muscles, and the outer circumference joint means includes a cylindrical outer muscle joint having a female thread on the inner circumference,
As the temporary fixing device, a cylindrical temporary fixing joint having an internal thread on the inner periphery and a bar member having an external thread on the outer periphery are prepared,
At the time of the temporary fixing, one of the selected first and second outer peripheral bars, the temporary fixing joint, the bar, the outer peripheral bar joint, and the other of the selected first and second outer peripheral bars. The screw connection between the first and second core bars is released, the screw connection between the temporary fixed joint and the one outer peripheral bar is released, and the outer bar joint and the bar are connected. The method of building a reinforcing bar rod according to claim 1 , wherein the screw connection is released.   Each of the first and second reinforcing bar rods has a quadrangular shape in plan view, and the first and second outer circumferential bars at one of the four corners of the first and second reinforcing bar rods are selected. The method of building a reinforcing bar rod according to claim 1, wherein the temporary fixing is performed. The temporary fixing device includes a first connecting part that is attachable to and detachable from the first outer periphery and a second connecting part that is attachable to and detachable from the second outer periphery.
  One of the first and second connecting portions is a cylindrical temporary fixed joint having an internal thread on the inner periphery, and the other of the first and second connecting portions has an external thread on the outer periphery. It is a bar member screw-coupled to the temporary fixing joint, and a margin of several millimeters is provided in the axial direction between the female screw thread and the male screw thread. 4. The reinforcing bar erection method according to any one of items 3.

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