JP6357303B2 - Reinforced concrete wall - Google Patents

Description

  The present invention relates to a reinforced concrete vertical wall that is handled as a non-bearing wall (structure calculation is performed) in a reinforced concrete structure, for example, a building such as an apartment house.

  In buildings such as reinforced concrete apartment buildings, vertical walls are used as partition walls. The vertical wall has an opening or a slit (including a complete slit and a partial slit) formed between the columns made of reinforced concrete arranged on both sides, and the edge is cut.

  Patent Document 1 proposes a vertical wall having a single bar arrangement in which vertical bars and horizontal bars are arranged at a predetermined pitch and are bound by a binding bar. Single reinforcement is not fixed to the left and right reinforced concrete columns and upper and lower reinforced concrete beams, or does not have sufficient fixing length, and the edges are cut from the left and right columns and the upper and lower beams. ing. Therefore, the vertical wall is a non-bearing wall that is not considered as a bearing wall in the structural calculation.

Japanese Patent Laid-Open No. 11-141022

  The vertical wall is configured not to bear the bending strength, but when a force from the side is applied to the building due to an earthquake or the like, a shearing force acts. Since the vertical wall is not constructed as a load-bearing wall, there is a risk of collapse even in the state where the surrounding structural members such as pillars and beams withstand horizontal loads and the like.

  For example, in the vertical wall disclosed in Patent Document 1, in order to cut the edges of the surrounding columns and beams, the vertical and horizontal reinforcing bars have a sufficient fixing length and are not fixed on the side of the columns and beams. Since it hardly functions as a reinforcing bar, the shear strength is small. Therefore, at the time of an earthquake or the like, shear cracks generated in the concrete grow rapidly, and the vertical wall tends to collapse due to shear failure. The collapse of the vertical wall may disrupt the evacuation route in the building in an emergency such as an earthquake. Moreover, there is a risk that a person near the vertical wall may be injured by a broken piece of concrete.

  In view of these points, an object of the present invention is to provide a reinforced concrete standing wall having sufficient shear strength that does not collapse before columns and beams.

In order to solve the above problems, the present invention is a concrete standing wall treated as a non-bearing wall in a reinforced concrete building.
It has a concrete wall and an assembly reinforcing bar embedded in the wall, and the assembly reinforcing bar is located between the vertical and vertical bars extending in the vertical direction of the wall along each of the ends on both sides of the wall. A plurality of horizontal bars extending in the wall width direction at a predetermined pitch, and one or a plurality of auxiliary vertical bars arranged in the vertical direction of the wall body at the center in the wall width direction, Reinforcing bars crossing with each of the horizontal bars and reinforcing bar crossing with each of the auxiliary vertical bars and horizontal bars are welded joints joined by spot welding, and the weld strength of the welded joints is the standard yield point of the transverse bars and the intensity or more, before lateral stripes after welding the welding standard yield strength and standard elongation of the base material can be ensured, the upper and lower ends of the auxiliary vertical stripes, upon application of rectangular standing walls, assembling rebar upper and lower The top and bottom edges of the wall so that it can be fixed to the side of the beam Protrudes, the upper and lower ends of the auxiliary vertical stripe protruding from the top and bottom of the wall, as is not transmitted as possible stress from above and below the beam to the auxiliary vertical line on the structural calculation, fixing length for the upper and lower beams Is set.

  The shearing force applied to the vertical wall from the outside is transmitted to the transverse bars arranged in the concrete wall. Further, each of the vertical bars on which the tensile force acts from the horizontal bars extends in a direction perpendicular to the tensile direction, and is held by the supporting pressure of the concrete that can sufficiently withstand the yield strength of the horizontal bars. Both ends of the horizontal bars are spot welded to the vertical bars, and the shear strength of the welded joint is set to be higher than the yield point strength of the base metal. Therefore, the transverse bar ensures the truss effect by strong welding with the vertical bars arranged at both ends, and a standing wall having a large shear strength is obtained.

  In this way, both ends of the transverse bar which functions as a shear reinforcement bar are joined to the vertical bar via a weld joint having a welding strength equal to or higher than the base material yield point strength. As a result, the same effect as that in the case where a predetermined fixing is obtained with respect to the adjacent columns and beams in the reinforcement of the structural wall and the floor, etc. is obtained inside the vertical wall that is cut from the columns and beams. Therefore, it is possible to realize a very safe standing wall in the event of an earthquake as compared with a conventional standing wall.

In the vertical wall of the present invention, the assembly reinforcing bar includes one or a plurality of auxiliary vertical bars arranged in the vertical direction of the wall body at the central part in the wall width direction, and the reinforcing bar intersecting part of each of the auxiliary vertical bars and the horizontal bars. Is a welded joint joined by spot welding, and the weld strength of the welded joint is greater than the standard yield point strength of the transverse bar, and the transverse bar after welding ensures the standard yield point strength and standard elongation of the base metal before welding Has been.

In the construction of the vertical wall, it is necessary to fix the assembly rebar in a predetermined position. In the present invention, the upper and lower ends of the vertical stripes and auxiliary vertical stripes Yes so as to project vertically from the top and bottom edges of the wall, Ru attaching these sites above and below the beam. As possible stress from the side of the beam under the above is not transmitted, a vertical stripe with respect to the upper and lower beams, are shorter fixing length of the auxiliary vertical line.

In particular, by extending both ends of the auxiliary longitudinal bars and attaching them to the upper beam side and the lower beam side, the assembly reinforcing bars are installed at predetermined positions . Moreover, it is desirable to arrange a plurality of auxiliary vertical bars and fix the assembled reinforcing bars to the upper and lower beams at a plurality of locations.

  The bending stress generated in the beam when a horizontal load is applied to the building is minimized at the center in the length direction. Since the vertical wall assembly rebar is attached to the central portion of the beam, bending stress applied to the vertical wall can be minimized. Further, by attaching the auxiliary reinforcing bars to the upper and lower beams with a plurality of auxiliary reinforcing bars, it is possible to prevent the assembled reinforcing bars from being in an unstable state such as rotating around one auxiliary vertical reinforcing bar.

(A) is a front view which shows an example of the reinforced concrete structure standing wall to which this invention is applied, (b) is the sectional drawing. (A) And (b) is explanatory drawing which shows two examples of the connection of a beam and a vertical wall. It is explanatory drawing which shows an assembly reinforcing bar. It is explanatory drawing which shows an assembly reinforcing bar. It is explanatory drawing which shows an assembly reinforcing bar.

  Hereinafter, an embodiment of a reinforced concrete vertical wall in a reinforced concrete structure will be described with reference to the drawings.

In a reinforced concrete structure 1, for example, a reinforced concrete apartment house, a reinforced concrete vertical wall 2 is installed as a partition wall in each dwelling unit. The reinforced concrete standing wall 2 is in a state where the edges are completely cut by the openings 5 and 6 from the columns 3 and 4 between the columns 3 and 4 of the reinforced concrete. Further, although it is connected to the upper reinforced concrete beam 7, half of the thickness direction is connected to the lower reinforced concrete beam 8 with the edge cut by the slit 9. Therefore, it is a non-bearing wall that is ignored in structural calculations.

  Here, the joint between the beam 7 and the vertical wall 2 is the concentric joint shown in FIG. 2 (a) in addition to the case shown in FIG. 1 (b), and the right side surface of the beam 7 as shown in FIG. 2 (b). Of course, the present invention is not limited to the vertical wall of the connection shown in FIG.

  Moreover, in the standing wall 2 shown in FIG. 1, the slit 9 is formed along the lower end edge. Of course, the present invention can be similarly applied to a vertical wall having no slit 9. In particular, in the case of a wall having a thickness of 100 mm or less, there is often no slit. Therefore, the vertical wall to which the present invention can be applied does not require the necessity of a slit.

  The wall body 10 of the vertical wall 2 is a wall having a thickness of about 120 mm including a finishing material including a mortar for surface finishing, for example. An assembly reinforcing bar 20 is embedded in the wall 10 of the vertical wall 2. In this example, a single reinforcing bar assembly bar 20 is embedded. It is also possible to provide the assembly rebar 20 so as to provide double reinforcement.

  As shown in FIG. 3, the assembly reinforcing bar 20 includes two vertical bars 21 and 22 that extend in the vertical direction of the wall body along each of the ends on both sides of the wall body 10, and a wall at the center in the wall body width direction. It consists of two auxiliary vertical bars 23, 24 extending in the vertical direction of the body and a plurality of horizontal bars 25 spanned in the wall width direction at a predetermined pitch between the vertical bars 21-24. Each of the vertical stripes 21 and 22 on both sides is arranged one by one, but a plurality of, for example, two can be arranged. In addition, although the two auxiliary vertical bars 23 and 24 are arranged, depending on circumstances, the number may be one or three or more.

  Reinforcing bar intersections between the vertical bars 21 to 24 and the horizontal bars 25 are respectively welded joints 26 joined by spot welding. The weld strength of each welded joint 26 is equal to or higher than the standard yield point strength of the horizontal bars 25, and the standard yield point strength and standard elongation of the base material before welding are secured in the horizontal bars 25 after welding.

  The vertical bars 21 to 24 and the horizontal bars 25 are steel bars for reinforced concrete specified in JIS G3112. For example, as the vertical bars 21 to 24 and the horizontal bars 25, deformed reinforcing bars D10 and D13 having a nominal diameter d of 10 mm or 13 mm are used. The pitch of the horizontal stripes 25 is, for example, 10d, and the distance between the central auxiliary vertical stripes 23, 24 is, for example, about 150 mm.

  Here, the upper and lower ends 23 a, 23 b, 24 a, 24 b of the auxiliary vertical bars 23, 24 extend above and below the upper and lower ends 10 a, 10 b of the wall body 10 by a predetermined length. By using the upper ends 23a and 24a and the lower ends 23b and 24b, the assembly reinforcing bar 20 can be attached and fixed to the upper and lower beams at the time of construction.

  Here, as shown in FIG. 4, three auxiliary vertical bars 31, 32, 33 may be arranged instead of the two auxiliary vertical bars 23, 24. The other configuration is the same as that of the above-described assembled reinforcing bar 20.

Further, as shown in FIG. 5, the upper and lower ends 23a, 23b, 24a, 24b of the auxiliary vertical bars 23, 24 and the upper and lower ends 21a, 21b, 22a, 22b of the vertical bars 21, 22 on both sides are attached to the wall body. The upper and lower ends 10a and 10b may be extended vertically by a predetermined length. Using these ends, the assembly rebar 20 can be attached and fixed to the upper and lower beams during construction. In this case, the fixing length of the vertical and auxiliary vertical bars to the upper and lower beams may be shortened so that stress is not exerted as much as possible from the upper and lower beams. In FIG. 5, the other configuration is the same as that of the above-described assembled reinforcing bar 20.

  As described above, instead of extending the auxiliary vertical bars and the vertical ends of the vertical bars and attaching them to the upper and lower beams, reinforcing bars for attaching the assembly reinforcing bars 20 may be arranged on the upper and lower beams.

DESCRIPTION OF SYMBOLS 1 Reinforced concrete structure 2 Standing wall 3, 4 Column 5, 6 Opening 7, 8 Beam 9 Slit 10 Wall body 10a, 10b End 20 Assembling reinforcing bars 21-24 Vertical bars 23a, 24a Upper end 23b, 24b Lower end 25 transverse bars 26 welded joints 31, 32, 33 auxiliary longitudinal bars

Claims (2)

A concrete standing wall treated as a non-bearing wall in a reinforced concrete building,
A concrete wall, and an assembly reinforcing bar embedded in the wall,
The assembly rebar is
Vertical bars extending in the vertical direction of the wall along each of the ends on both sides of the wall,
A plurality of horizontal bars spanning in the wall width direction at a predetermined pitch between the vertical bars, and
Including one or more auxiliary vertical bars arranged in the vertical direction of the wall body in the center of the wall width direction;
Reinforcing bar intersections between each of the vertical bars and each of the horizontal bars, and reinforcing bar crossing parts of the auxiliary vertical bars and each of the horizontal bars are weld joints joined by spot welding,
The weld strength of the weld joint is equal to or greater than the standard yield point strength of the transverse bar, and the transverse bar after welding is ensured the standard yield point strength and standard elongation of the base material before welding,
The upper and lower ends of the auxiliary vertical bars protrude from the upper and lower ends of the wall body so that the assembly reinforcing bars can be fixed to the upper and lower beams when the vertical wall is constructed ,
The upper and lower ends of the auxiliary vertical bars projecting from the upper end and the lower end of the wall body are arranged with respect to the upper and lower beams so that stress is not transmitted to the auxiliary vertical bars as much as possible from the upper and lower beams in the structural calculation. The fixing length is set ,
The above-mentioned “the fixing length for the upper and lower beams is set so that stress is not transmitted from the upper and lower beams to the auxiliary vertical bars as much as possible in the structural calculation” means that the vertical wall is not in the structural calculation. Meaning that the fixed length of the upper and lower ends of the auxiliary longitudinal bars with respect to the upper and lower beams is shorter than the fixed length in which the vertical wall is considered as a load bearing wall in the structural calculation so that it is handled as a load bearing wall A reinforced concrete standing wall. The upper and lower ends of the vertical bars protrude from the upper and lower ends of the wall body and can be attached to the upper and lower beams so that the assembly reinforcing bars can be fixed to the upper and lower beams when the vertical wall is constructed. Yes,
The upper and lower ends of the vertical bars projecting from the upper end and the lower end of the wall body are fixed to the upper and lower beams so that stress is not transmitted to the vertical bars as much as possible from the upper and lower beams in the structural calculation. Is set ,
The “fixed length for the upper and lower beams is set so that stress is not transmitted from the upper and lower beams to the vertical bars as much as possible in the structural calculation” means that the vertical wall has a non-bearing force in the structural calculation. Meaning that the fixed length of the upper and lower ends of the vertical bars with respect to the upper and lower beams is shorter than the fixed length in which the vertical wall is considered as a load bearing wall in the structural calculation so as to be treated as a wall reinforced concrete mullions wall according to <br/> claim 1 are.

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