JP6261860B2 - Reinforcing bar anchoring structure - Google Patents

Description

The present invention relates to a reinforcing bar fixing structure .

  In Patent Literature 1, in a reinforcing bar fixing device that is installed inside a column main bar in a column and beam joint and fixes the main bar of the beam, a ring-shaped part to which the main bar of the beam is connected, and an inner side of the ring-shaped part There is disclosed a fixing device for reinforcing bars, which is provided with a rib portion that reinforces the ring-shaped portion and is provided (see Patent Document 1).

  Here, when the fixing property of the beam main bar is not secured in the column beam joint, the beam main bar is pulled out from the column beam joint, and the hysteresis property of the entire frame becomes a slip type. When the hysteresis property is a slip type, there is a possibility that the absorption amount of hysteresis energy assumed in the design is not secured.

  In order to secure the anchorage of the beam main bar so that the beam main bar does not come out from the column beam joint, it is necessary to enlarge the column and lengthen the anchorage of the beam main bar. However, if the columnar structure is increased to secure the anchoring of the beam main bar, the horizontal section of the column becomes larger than necessary.

  Therefore, there is room for improvement with regard to preventing the beam main bars from coming out.

JP-A-9-177245

  In view of the above facts, the present invention has a problem of preventing the beam main bars from coming out.

The invention of claim 1 includes a lower frame member to which the shaft end portion of the lower beam main bar is joined, an upper frame member to which the shaft end portion of the upper beam main bar is joined, the lower frame member and the upper frame member. And a connecting member for connecting the upper and lower frame members to each other at intervals in the vertical direction, and the lower beam main bar and the upper beam main bar are inserted into the lower frame member and the upper frame member. Reinforcing bars that are larger than the holes are provided at the ends of the lower beam main bar and the upper beam main bar, and the lower frame member and the upper frame member are overlapped and joined respectively. The upper end of the lower beam main bar or the upper end of the upper beam main bar is engaged with the overlapping surface to form a recess that becomes the hole. ing.

  In the first aspect of the present invention, the shaft end portion of the lower beam main bar is coupled to the lower frame member of the reinforcing bar fixing device, and the shaft end portion of the upper beam main bar is coupled to the upper frame member of the reinforcing bar fixing device. Accordingly, the beam main bars are prevented from coming out.

In addition, by engaging the shaft end portion of the lower beam main bar and the shaft end portion of the upper beam main bar with the concave portion of the plate frame material and sandwiching and joining them with the plate frame material, the beam bar reinforcement work is completed. Therefore, the workability is improved.

In the invention according to claim 2, the upper end portion of the column main reinforcement of the lower column is joined to the lower frame member, and the lower end portion of the column main reinforcement of the upper column is joined to the upper frame member.

In the invention according to claim 2 , the column main bar and the beam main bar do not interfere with each other, so that the workability of the bar arrangement is improved.

According to a third aspect of the present invention, a lower beam main bar of a base beam connected to a base portion supporting a column steel frame is joined to the lower frame member, and an upper beam main bar of the base beam is connected to the upper frame member. Are joined.

In invention of Claim 3, interference with a beam main reinforcement, for example, a pile reinforcement, an anchor bolt, a mount frame etc. which are provided in a foundation part is suppressed, and workability | operativity improves.

According to a fourth aspect of the present invention, a steel frame having a gantry on the upper side and a lower side is provided outside the reinforcing bar fixing device, and the gantry on the lower side of the steel frame is provided with the steel frame fixing device. A lower frame member is placed, and anchor bolts that are embedded in concrete and support the column steel frame are attached to the steel frame.

In the invention according to claim 4, by mounting the reinforcing bar fixing device on the pedestal that supports the anchor bolt of the column steel frame, the construction is easy as compared with the case where a spacer block or the like on which the reinforcing bar fixing device is separately mounted.

  According to the present invention, it is possible to prevent the beam main bars from coming out.

It is a perspective view which shows the reinforcement of the joint part of 1st embodiment. (A) is a perspective view showing an upper beam reinforcing bar unit and a lower beam reinforcing bar unit, (B) is a perspective view showing a joint part reinforcing bar unit, (C) is a perspective view showing a column reinforcing bar unit. It is. It is a perspective view which shows the beam reinforcement arranged by the upper beam reinforcement unit and the lower beam reinforcement unit. It is a perspective view which shows a reinforcing bar fixing apparatus. FIG. 5 is an exploded perspective view of the reinforcing bar fixing device of FIG. 4. (A) is a perspective view which shows the joint part reinforcing bar unit which comprises a reinforcing bar fixing apparatus, (B) is the elements on larger scale of the B section of (A). It is a perspective view which shows (A) and (B) of the construction process of the joint part of 1st embodiment. It is a perspective view which shows (C) and (D) of the construction process of the joint part of 1st embodiment. (A) is a disassembled perspective view which shows the reinforcing bar fixing apparatus of a 1st modification, (B) is a front view which shows the principal part of (A). (A) is a perspective view which shows the reinforcing bar fixing apparatus of a 2nd modification, (B) is a perspective view which shows the principal part of (A). It is a disassembled perspective view which shows the reinforcing bar fixing apparatus of a 3rd modification. It is a perspective view which shows the reinforcing bar fixing apparatus of a 4th modification. (A) is a perspective view which shows the joint part reinforcing bar unit of the reinforcing bar fixing apparatus of a 5th modification, (B) is the elements on larger scale of the B section of (A). (A) is a perspective view which shows the joint part reinforcing bar unit of the reinforcing bar fixing apparatus of a 6th modification, (B) is the elements on larger scale of the B section of (A). It is a perspective view which shows (A) and (B) of the construction process of the foundation part of 2nd embodiment. It is a perspective view which shows (C) and (D) of the construction process of the foundation part of 2nd embodiment. It is a perspective view which shows (E) and (F) of the construction process of the foundation part of 2nd embodiment. It is a perspective view which shows (G) and (H) of the construction process of the foundation part of 2nd embodiment. It is a top view which shows the reinforcement of the base part of 2nd embodiment.

<First embodiment>
The reinforcing bar fixing device and the reinforcing bar fixing device according to an embodiment of the present invention will be described with respect to a reinforcing bar structure in which the reinforcing bar fixing device and the reinforcing bar fixing device are applied to a joint portion (column beam joint) between a reinforced concrete column and a reinforced concrete beam. In each figure, the vertical direction is indicated by an arrow Z, and two directions perpendicular to the horizontal direction are indicated by an arrow X and an arrow Y. In each figure, only various reinforcing bars are shown, and concrete is not shown.

[Outline structure of the joint]
First, the schematic structure of the joint will be described.

  As shown in FIG. 1, a reinforcing bar fixing device 100 is embedded in a joint portion (column beam joint) 30 between a reinforced concrete column 10 and a reinforced concrete beam 20A, 20B, 20C, 20D on an above-ground floor or an underground floor. ing. Beam reinforcing bars 52L and 52U, which will be described later, and column main bars 14L and 14U are joined to the reinforcing bar fixing device 100. Further, the upper side of the joint portion 30 in the column 10 is an upper column 12U, and the lower side is a lower column 12L.

  The beams 20A and 20C are provided along the X direction, and the beams 20B and 20D are provided along the Y direction. The beams 20A, 20B, 20C, and 20D have the same configuration except that they are arranged in different locations and directions. Therefore, in the following description, when it is not necessary to distinguish these, A, B, C, and D after the reference numerals are omitted.

  In the present embodiment, the beam reinforcing bar embedded in the beam 20 includes a lower beam reinforcing bar unit 50L and an upper beam reinforcing bar unit 50U.

[Beam bar unit]
Next, the lower beam reinforcing bar unit 50L and the upper beam reinforcing bar unit 50U will be described.

  In the following description, each member constituting the lower beam reinforcing bar unit 50L is denoted by “L” after the symbol, and each member constituting the upper beam reinforcing bar unit 50U is denoted by “U” after the symbol. . The lower beam reinforcing bar unit 50L and the upper beam reinforcing bar unit 50U have substantially the same configuration except that the vertical direction is different. Therefore, U and L are omitted when explaining without distinguishing these.

  As shown in FIGS. 1, 2A, and 3, the lower beam reinforcing bar unit 50L includes a beam main reinforcing bar 52L and a shear reinforcing bar 54L. Similarly, the upper beam reinforcing bar unit 50U includes a beam main reinforcing bar 52U and a shear reinforcing bar 54U.

  The main beam reinforcing bar 52L constituting the lower beam reinforcing bar unit 50L is arranged in the beam length direction (X direction or Y direction, see FIG. 1) with a space in the beam width direction below the beam 20 (see FIGS. 1 and 3). It is arranged along. Further, the shear reinforcement bars 54L constituting the lower beam reinforcing bar unit 50L are U-shaped with the upper side as the opening side, and are arranged at intervals in the beam length direction, and the U-shaped bottom part is the beam main bar. It is joined to 52L.

  Similarly, the main beam reinforcing bar 52U constituting the upper beam reinforcing bar unit 50U has a beam length direction (X direction or Y direction, FIG. 1) spaced above the beam 20 (see FIGS. 1 and 3) in the beam width direction. Reference). Further, the shear reinforcing bar 54U constituting the upper beam reinforcing bar unit 50U has a U shape (inverted U shape) with the lower side as an opening side, and is disposed at intervals in the beam length direction. The bottom of the character is joined to the beam main bar 52U.

  As shown in FIGS. 1 and 3, the shaft end portion 55L of the shear reinforcement bar 54L of the lower beam reinforcing bar unit 50L and the shaft end portion 55U of the shear reinforcement bar 54U of the upper beam reinforcing bar unit 50U are overlapped. Are bound by.

  Further, as shown in FIGS. 2A and 3, a reinforcing bar cove 53 larger than the outer diameter of the beam main bar 52 is provided at the tip of each beam main bar 52.

  The beam main bar 52 and the shear reinforcement bar 54 are joined in advance by electric resistance welding (spot welding). Further, the beam reinforcing bar unit 50 of the present embodiment is manufactured not at the construction site but at a factory in another place.

[Rebar fixing device]
Next, the reinforcing bar fixing device 100 embedded in the joint portion (column beam joint portion) 30 will be described.

  As shown in FIGS. 4 and 5, the reinforcing bar fixing device 100 includes a lower frame member 110 </ b> L, an upper frame member 110 </ b> U, and a connecting member 130. In the following description, the lower member is basically denoted by L after the reference numeral, and the upper member is denoted by U after the reference numeral. Moreover, when it demonstrates without distinguishing both, L and U are abbreviate | omitted and demonstrated.

  The lower frame member 110L and the upper frame member 110U have a rectangular frame shape in plan view, and are arranged with an interval in the vertical direction. The lower frame member 110L and the upper frame member 110U are connected by a connecting member 130. The connecting member 130 is configured to include a column main bar 132 arranged in the joint portion 30 and a shear reinforcing bar 134 surrounding the column main bar 132. Note that the column main bars 132 and the shear reinforcement bars 134 are joined in advance by electric resistance welding (spot welding) or binding wires.

  Further, the lower end portion 135L of the column main bar 132 is welded and joined to the lower frame member 110L, and the upper end portion 135U of the column main bar 132 is welded to the upper frame member 110U. In the present embodiment, as shown in FIG. 6, the tip end portions 137 of the upper and lower end portions 135 in the columnar main bars 132 have a groove shape.

  As shown in FIG. 1, the shaft end 51L (see also FIG. 3) of the lower beam main bar 52L is joined to the lower frame member 110L, and the shaft end of the upper beam main bar 52U is joined to the upper frame member 110U. The part 51U (see also FIG. 3) is joined. Further, the end 16L of the column main reinforcement 14L of the lower pillar 12L is joined to the lower frame member 110L, and the end 16U of the column principal reinforcement 14U of the upper pillar 12U is joined to the upper frame member 110U.

  As shown in FIGS. 4 and 5, in the present embodiment, the lower frame member 110 </ b> L and the upper frame member 110 </ b> U are each a plurality of (two in this embodiment) plate frame members that are overlapped and joined together. 112L and 112U. Further, concave portions 116L and 116U are formed on the overlapping surfaces 114L and 114U of the plate frame members 112L and 112U.

  As shown in FIG. 4, the overlapping surfaces 114L and 114U of the plate frame members 112L and 112U are welded together. Further, the holes 118L and 118U are formed by bonding.

  As shown in FIG. 1, the overlapping surfaces 114L, with the shaft end portions 51L, 51U (see FIG. 3) of the beam main bars 52L, 52U engaged with the recesses 116L, 116U of the plate frame members 112L, 112U, respectively. 114U is joined.

  As shown by an imaginary line (two-dot broken line) in FIG. 5, in this embodiment, before the plate frame members 112U and 112L are joined to each other, one of the plate frame members 112L (the lower side) has the lower pillar 12L. The end portion 16L of the column main bar 14L is joined, and the end portion 16U of the column main bar 14U of the upper column 12U is joined to one (upper side) of the plate frame material 112U.

  Then, as shown in FIGS. 2B, 2C, and 5, before the plate frame members 112 are joined, the joint portion reinforcing bar unit 102 and the column reinforcing bar units 104L and 104L are combined. It is composed. In addition, the plate frame member 112 is joined to the column reinforcement unit 104 at the upper and lower ends. Further, a shear reinforcing bar 15 is joined to the column reinforcing bar unit 104 so as to surround the column main bar 14. Further, the column main bars 14 and the shear reinforcement bars 15 are joined in advance by electric resistance welding (spot welding) or binding wires.

  In addition, the column reinforcing bar unit 104 and the joint part reinforcing bar unit 102 of this embodiment are manufactured not in the construction site but in a factory in another place.

[Installation process of joint part]
Below, the construction process of the joint part 30 is demonstrated.

  As shown in FIG. 7 (A), a column rebar unit 104L constituting the lower column 12L (see also FIG. 1) is built, and the lower beam rebar unit is installed in the plate frame member 112L constituting the lower frame member 110L. Put 50L. At this time, the shaft end 51L (see FIG. 3) of the beam main reinforcing bar 52L of the beam reinforcing bar unit 50L is engaged with the recess 116L of the plate frame member 112L.

  As shown in FIG. 7 (B), the joint portion reinforcing bar unit 102 is placed so that the shaft end portion 51L of the beam main reinforcing bar 52L of the beam reinforcing bar unit 50L is engaged with the concave portion 116U of the plate frame member 112L. 114L (see FIG. 5) are joined together (see FIG. 4).

  As shown in FIG. 7C, the upper beam reinforcing bar unit 50U is placed on the plate frame member 112U constituting the upper frame member 110U. At this time, the shaft end 51U (see FIG. 3) of the beam main reinforcing bar 52U of the beam reinforcing bar unit 50U is engaged with the recess 116U of the plate frame member 112U.

  As shown in FIG. 7D, the column reinforcing bar unit 104U constituting the upper column 12U (see also FIG. 1) is inserted into the recess 116U of the plate frame member 112U and the shaft end 51U of the beam reinforcing bar 52U of the beam reinforcing bar unit 50U (see FIG. 7D). 3 (see FIG. 5), and the overlapping surfaces 114U (see FIG. 5) are joined (see FIG. 4).

  Then, a formwork is provided around the reinforced reinforcing bars, and concrete is placed to construct the reinforced concrete beam 20 and the column 10. Further, the shaft end portion 55L of the shear reinforcing bar 54L of the lower beam reinforcing bar unit 50L and the shaft end portion 55U of the shear reinforcing bar 54U of the upper beam reinforcing bar unit 50U are coupled by a lap joint. In addition, you may couple | bond by methods other than a lap joint. For example, welding may be performed before placing concrete.

  In addition, the column beam of an upper floor is constructed | assembled by repeating the construction demonstrated in FIG. 7 on the column reinforcement unit 104U.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

  The shaft end portion 51L of the beam main reinforcing bar 52L constituting the lower beam reinforcing bar unit 50L is joined (tightened) to the lower frame member 110L of the reinforcing bar fixing device 100, and the shaft of the beam main reinforcing bar 52U constituting the upper beam reinforcing bar unit 50U is joined. The end 51U is joined (tightened) to the upper frame member 110U of the reinforcing bar fixing device 100. Further, in this embodiment, the reinforcing bar 53 is larger than the hole diameter of the hole 118 (see FIG. 5) formed by overlapping the concave portion 116 (see FIG. 1), so that the beam is drawn from the lower frame member 110L and the upper frame member 110U. The main muscle 52 is not pulled out.

  The tensile loads of the beam main bars 52L and 52U are transmitted to the entire reinforcing bar fixing device 100 including the connecting member 130 (the column main bars 132 and the shear reinforcement bars 134) via the lower frame member 110L and the upper frame member 110U. The entire reinforcing bar fixing device 100 receives a tensile load. Further, the main beam 52 is joined (tightened) to the reinforcing bar fixing device 100, so that the deformation of the main beam 52 is restrained.

  Therefore, the beam main bar 52 is prevented from coming out from the joint portion 30. Therefore, in order to secure the fixing strength of the main beam of the joint 30, for example, it is not necessary to increase the bending amount of the main beam of the beam or to increase the fixing cost.

  Further, by engaging the shaft end portion 51 of the beam main bar 52 with the recess 116 of the plate frame member 112 and sandwiching and joining the plate frame member 112, the bar arrangement work of the beam main bar 52 is completed. Furthermore, as shown in FIG. 1, the beam main bars 52 of the beams 20A and 20C in the X direction and the beams 20B and 20C in the Y direction do not interfere with each other in the joint portion 30 (the beam main bars 52 do not interfere with each other). Further, the beam main bar 52 and the column main bar 14 do not interfere with each other. Therefore, the bar arrangement accuracy and workability are improved.

  Further, since it is not necessary to provide a step in the height direction so that the beam main bars 52 do not interfere with each other in the joint portion 30, the beam formation is made lower than when the beam main bars 52 are provided with a step in the height direction. be able to.

  In addition, as shown in FIG. 2, since the column reinforcing bar unit 104, the beam reinforcing bar unit 50, and the jointed reinforcing bar unit 102 are unitized, the quality is guaranteed as compared with the case where the bars are locally arranged. , Work on site is reduced.

  In the beam reinforcing bar unit 50, since the beam main reinforcing bar 52 and the shear reinforcing bar 54 are joined in advance by electric resistance welding, it is not necessary to bind the two at the site and there is no disturbance of the bar arrangement. Will improve. Furthermore, by dividing the beam reinforcement into the lower beam reinforcement unit 50L and the upper beam reinforcement unit 50U, compared with the case where it is not divided into two units, the load is not bulky when transporting to the site, Transportability is improved.

  Similarly, also in the beam reinforcing bar unit 50 and the column reinforcing bar unit 104, the column main bars 14, 132 and the shear reinforcing bars 15, 134 are joined in advance by electric resistance welding, so that it is necessary to bind them at the site. And there is no disturbance of the bar arrangement, so the workability is improved.

  In addition, it is possible to reinforce the columns, beams and walls before the construction of the slab formwork, improving the work efficiency of the rebar work.

[Modification]
Next, a modification of this embodiment will be described.

(First modification)
In the reinforcing bar fixing device 202 of the first modification shown in FIG. 8, the upper frame member 111U is composed of three plate frame members 113A, 113B, and 113C that are overlapped and joined to each other. Further, concave portions 116A, 116B, and 116C are formed on the overlapping surfaces 115A, 115B, and 115C of the plate frame members 113A, 113B, and 113C, respectively.

  Then, the shaft end 51U (see FIG. 3) of the upper beam main reinforcement 52U arranged in two stages in the vertical direction is engaged with the recesses 116A, 116B, and 116C of the plate frame members 113A, 113B, and 113C. In other words, the hole 118 into which the beam main reinforcing bar 52 is inserted and joined is formed in two stages up and down (see FIG. 8B). Therefore, in the reinforcing bar fixing device 202, the upper beam main reinforcing bar 52U corresponds to a double streak configuration.

  Similarly, the lower frame member may be composed of three plate frame members 113A, 113B, and 113C, and the lower beam main reinforcing bar 52L may correspond to a two-stage reinforcing member. Further, it may be composed of four or more plate frame members, and may correspond to a structure of three or more streaks.

(Second modification)
In the reinforcing bar fixing device 204 of the second modification shown in FIG. 9, the lower frame member 210L and the upper frame member 210U are not divided into plate frame members, and holes 118 are formed. Then, the beam main reinforcement 52 is inserted through the hole 118 and joined. Note that any method may be used for joining the beam main reinforcing bars 52 to the lower frame member 210L and the upper frame member 210U. For example, a weld metal may be poured into the hole 118 and solidified, or as shown in FIG. 9B, a fixing plate 190 may be joined to the tip 55 after insertion to prevent the metal from coming out.

(Third modification)
In the reinforcing bar fixing device 206 of the third modification shown in FIG. 10, the lower frame member 110L and the upper frame member 110U are connected by a connecting member 220 formed of a steel pipe. Note that the lower frame member 110L, the upper frame member 110U, and the connecting member 220 are joined by welding. By using the connecting member 220 as a steel pipe in this manner, the rigidity of the reinforcing bar fixing device 206 is improved, and as a result, the strength of the joint portion 30 is improved.

(Fourth modification)
In the reinforcing bar fixing device 208 of the fourth modification shown in FIG. 11, the plate frame material 112 is fastened by bolts 299 (and nuts). Therefore, for example, workability is improved as compared with welding joining.

(Fifth modification)
In the reinforcing bar fixing device 209 of the fifth modified example shown in FIG. 12, sleeves 212L and 212U are provided on the lower frame member 110L and the upper frame member 110U. Then, the shaft end portion 135 of the columnar main bar 132 is inserted into the sleeve 212, and the weld metal 214 (see FIG. 11B) is poured into the sleeve 212 to be consolidated. Providing the sleeve 212 in this way facilitates the positioning of the joining portion of the column main bars 132 and improves the positioning accuracy.

(Sixth modification)
In the reinforcing bar fixing device 211 of the sixth modification shown in FIG. 13, sleeves 212L and 212U are provided on the lower frame member 110L and the upper frame member 110U. Then, threaded grooves 137 and 213 (see FIG. 13B) are cut and screwed into the shaft end portion 135 of the columnar main bar 132 and the sleeve 212.

(Other)
In the fifth modification and the sixth modification, the number of sleeves 212 is larger than the number of column main bars 132. This is because versatility is enhanced so that it can be used even when the column main bars 132 are increased.

  Further, the joining of the column main reinforcement 14L of the lower column 12L and the column main reinforcement 14U of the upper column 12U with the lower frame member 110L and the upper frame member 110U is also performed as in the fifth and sixth modifications. It is possible to apply a structure that is inserted into and joined.

<Second embodiment>
The reinforcing bar fixing device 100 according to an embodiment of the present invention is applied to a foundation part which is a column beam joint (joint part) between a reinforced concrete foundation beam on a foundation floor and a reinforced concrete foundation column which is a steel frame from the upper part. The applied structure will be described.

  The reinforcing bar fixing device 100 has the same configuration as that of the first embodiment shown in FIGS. A modification of the first embodiment can also be applied to this embodiment. In addition, the same members as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

[Overview of basic section]
First, the outline of the basic part will be described.

  As shown in FIG. 14A, FIG. 14H, FIG. 15 and the like, the foundation part 200 is provided on the pile head 302. The base portion 200 is a column beam joint portion (joint portion) between the base beams 280A, 280B, and 280C and a reinforced concrete base column 284 (FIG. 14H) that forms a steel frame from the top.

  The reinforcing bar fixing device 100 similar to that of the first embodiment is embedded in the base portion 200, and the main beam beams 52L and 52U of the base beams 280A, 280B, and 280C are joined (tightened) to the reinforcing bar fixing device 100. .

  A steel frame 250 (see also FIG. 14G) is installed outside the reinforcing bar fixing device 100, and anchor bolts 254 for attaching the column steel frame 282 to the upper part of the reinforced concrete foundation column 284 are provided inside the reinforcing bar fixing device 100. Installed. Further, a basic reinforcing bar 312 and a basic reinforcing bar 310 are arranged around the reinforcing bar fixing device 100 (steel frame 250).

[Basic construction method]
Below, the construction method of a foundation part is demonstrated.

  As shown in FIG. 14 (A), a dumping container 304 for foundation construction is placed around the pile head 302 (see also FIG. 15). Then, a steel frame 250 (FIG. 14 (G)) used for fixing an anchor bolt 254 (see FIGS. 14 (G) and (H)) for attaching a column steel frame 282, which will be described later, to the discarding container 304 is configured. The side mount 251 is installed.

  As shown in FIG. 14B, the basic reinforcement 310 is performed, and the plate frame material 112L (see FIGS. 4 and 5) constituting the lower frame material 110L of the reinforcing bar fixing device 100 is installed on the mount 251. . In addition, the pile reinforcement 301 is arrange | positioned inside the board frame material 112L (refer also FIG. 15).

  As shown in FIG. 14C, the lower beam reinforcing bar unit 50L is placed on the plate frame member 112L. At this time, the shaft end portion 51L of the beam main reinforcing bar 52L on the lower side of the beam reinforcing bar unit 50L is engaged with the recess 116L of the plate frame member 112L constituting the lower frame member 110L.

  As shown in FIG. 14D, the joint portion reinforcing bar unit 102 is placed so that the shaft end portion 51L of the beam main reinforcing bar 52L of the beam reinforcing bar unit 50L is engaged with the recess 116U of the plate frame member 112L, and the overlapping surface 114L (see FIG. 5) are joined together (see FIG. 4).

  As shown in FIG. 14E, the upper beam reinforcing bar unit 50U is placed on the plate frame member 112U constituting the upper frame member 110U. At this time, the shaft end 51U (see FIG. 3) of the beam main reinforcing bar 52U of the beam reinforcing bar unit 50U is engaged with the recess 116U of the plate frame member 112U.

  As shown in FIG. 14 (F), the shaft end portion 51U (see FIG. 3) of the beam main reinforcing bar 52U of the beam reinforcing bar unit 50U is engaged with the recess 116U of the plate frame member 112U constituting the upper frame member 110U of the reinforcing bar fixing device 100. The overlapping surfaces 114U (see FIG. 5) are joined together (see FIG. 4).

  As shown in FIG. 14G, the upper frame 252 is installed using the lower frame 251 (see FIG. 14A), and the steel frame 250 is assembled. Then, anchor bolts 254 are attached to the steel frame 250. The steel frame 250 is installed outside the reinforcing bar fixing device 100, and the anchor bolt 254 is installed inside the reinforcing bar fixing device 100 (see also FIG. 15).

  As shown in FIG. 14 (H), the basic rebar 312 is arranged around the reinforcing bar fixing device 100 (steel frame 250).

  Then, a formwork is provided and concrete is placed, and the foundation portion 200, the reinforced concrete beam 280, and the reinforced concrete column 284 are constructed. In addition, after placing the concrete of the foundation part 200 that supports the column steel frame 282, the column steel frame 282 is attached to the anchor bolt 254.

  Further, the shaft end portion 55L of the shear reinforcing bar 54L of the lower beam reinforcing bar unit 50L and the shaft end portion 55U of the shear reinforcing bar 54U of the upper beam reinforcing bar unit 50U are coupled by a lap joint. In addition, you may couple | bond by methods other than a lap joint. For example, welding may be performed before placing concrete.

[Action and effect]
Next, functions and effects of the present embodiment will be described.

  As in the first embodiment, the shaft end 51L of the beam main reinforcing bar 52L constituting the lower beam reinforcing bar unit 50L is joined (tightened) to the lower frame member 110L of the reinforcing bar fixing device 100, and the upper beam reinforcing bar unit 50U. The shaft end portion 51U of the beam main reinforcing bar 52U is joined (tightened) to the upper frame member 110U of the reinforcing bar fixing device 100. Further, since the reinforcing bar cove 53 is larger than the hole diameter of the hole 118 (see FIG. 5) formed by overlapping the recess 116, the beam main reinforcing bar 52 is not pulled out from the lower frame member 110L and the upper frame member 110U.

  The tensile loads of the beam main bars 52L and 52U are transmitted to the entire reinforcing bar fixing device 100 including the connecting member 130 (the column main bars 132 and the shear reinforcement bars 134) via the lower frame member 110L and the upper frame member 110U. The entire reinforcing bar fixing device 100 receives a tensile load. Further, the main beam 52 is joined (tightened) to the reinforcing bar fixing device 100, so that the deformation of the main beam 52 is restrained.

  Accordingly, the beam main bar 52 is prevented from coming off from the base portion 200. Further, in order to secure the fixing strength of the beam reinforcement in the foundation portion 200, for example, it is not necessary to lengthen the fixing margin by increasing the bending of the beam reinforcement or the column formation.

  Further, in the base portion 200, the beam main bars 52 of the beams 280A and 280C in the X direction and the beam 280B in the Y direction do not interfere with each other (the beam main bars 52 do not interfere with each other). Further, since the reinforcing bar fixing device 100 is disposed so as to surround the anchor bolt 254 and the pile reinforcing bar 301, interference between these and the beam main reinforcing bar 52 is avoided.

  In addition, by using the lower frame 251 of the steel frame 250 that supports the anchor bolts 254 of the column steel frames 282 for mounting the reinforcing bar fixing device 100, the construction of the reinforcing bar fixing device 100 is made more efficient. Note that the reinforcing bar fixing device 100 may be attached by inserting a spacer block or the like under the lower frame member 110 without using the lower frame 251 of the steel frame 250.

In addition, description of the effect | action and effect which overlap with 1st embodiment and a modification is abbreviate | omitted.
<Others>
The present invention is not limited to the above embodiment.

  In the said embodiment, although this invention was applied to the joint part 30 and the base part 200 of a ground floor, it is not limited to this.

  For example, the present invention can also be applied to a structure that does not support column steel in the foundation beam of the second embodiment (base beam joint) or a column beam joint between a foundation beam and a reinforced concrete column.

  The upper column supported by the anchor bolts of the foundation may be not only a steel column but also a steel tube column of a concrete-filled steel pipe (CFT) or a steel column of a steel reinforced concrete.

  Moreover, in the said embodiment, although the beam (beam main reinforcement) joined to a reinforcing bar fixing apparatus was four (1st embodiment) or three (2nd embodiment), it is not limited to this. There may be two beams (the crossing direction or the same direction) may be joined to the reinforcing bar fixing device, or one beam.

  Furthermore, the present invention can be implemented in various modes without departing from the gist of the present invention.

12L Lower column 12U Upper column 14L Column main bar 14U Column main bar 16L Upper end 16U Joined to the lower end 51L Shaft end 52L Beam main bar (an example of lower beam main bar)
51L Shaft end 52U Beam main bar (an example of upper beam main bar)
DESCRIPTION OF SYMBOLS 100 Rebar fixing device 110L Lower frame material 110U Upper frame material 112L Board frame material 112U Plate frame material 116L Recess 116U Recess 130 Connection member 200 Base part 202 Rebar fixing device 204 Rebar fixing device 206 Rebar fixing device 220 Connection unit 208 Rebar fixing device 209 Reinforcing bar fixing device 211 Reinforcing bar fixing device 251 Mount 254 Anchor bolt 280A Foundation beam 280B Foundation beam 280C Foundation beam 282 Column steel frame

Claims (4)

A lower frame member to which the shaft ends of the lower beam main bars are joined;
An upper frame member to which the shaft ends of the upper beam main bars are joined;
A connecting member for connecting the lower frame member and the upper frame member with an interval in the vertical direction;
Having a reinforcing bar fixing device,
In the lower frame material and the upper frame material, a hole through which the lower beam main bar and the upper beam main bar are inserted is formed,
At the tip of the lower beam main bar and the upper beam main bar, a reinforcing bar cove larger than the hole is provided ,
The lower frame material and the upper frame material are each composed of a plurality of plate frame materials that are overlapped and joined in the vertical direction,
The reinforcing bar fixing structure , wherein the overlapping surface is engaged with the axial end portion of the lower beam main reinforcing bar or the axial end portion of the upper beam main reinforcing rod, and a concave portion serving as the hole is formed by overlapping . The lower frame member is joined to the upper end of the columnar reinforcement of the lower column,
The upper frame member is joined to the lower end of the main pillar of the upper column,
The reinforcing bar fixing structure according to claim 1. The lower frame material is joined to the lower beam main reinforcement of the foundation beam connected to the foundation supporting the column steel frame,
The upper beam main bar of the foundation beam is joined to the upper frame member,
The reinforcing bar fixing structure according to claim 1 . Outside the reinforcing bar fixing device, a steel frame having a gantry on the upper side and the lower side is provided,
The lower frame member of the reinforcing bar fixing device is placed on the mount on the lower side of the steel frame,
In the steel frame, an anchor bolt embedded in concrete and supporting the column steel frame is attached.
The reinforcing bar fixing structure according to claim 3 .

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