JP2011196141A - Bar arrangement structure around through-hole of concrete beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate arrangement of an auxiliary reinforcing member to be arranged where stirrup density is low, at an upper or lower part of a through-hole of a beam.SOLUTION: The bar arrangement structure around the through-hole of the concrete-made beam is structured as follows. Namely, the beam 1 includes a main reinforcement 6 arranged in an axial direction of the beam 1, stirrups 7 arranged in a manner of surrounding the main reinforcement 6, and the through-hole 2 extending in the width direction of the beam 1. The auxiliary reinforcing members 20 locked to the main reinforcement 6 are arranged above and below the through-hole 2. The auxiliary reinforcing member 20 includes locking parts 21 locked to the main reinforcement 6, and reinforcing parts 22, 22 extending from the locking part 21 to both sides in the axial direction of the beam and gradually directing toward the center in the height direction of the beam, respectively. In the reinforcing parts 22, the parts positioned closest to the center in the height direction of the beam have the height that does not reach the upper edge or the lower edge of the through-hole 2. An auxiliary reinforcement 25 is arranged on the center side of the main reinforcement 6, to which the locking part 21 is locked, in the height direction of the beam. The reinforcing parts 22 includes second locking parts 23, which are locked to the auxiliary reinforcement 25.

Description

  The present invention relates to a bar arrangement structure around a through hole provided in a reinforced concrete beam or a steel-framed reinforced concrete beam.

  For example, as shown in FIG. 10, in order to prevent the piping from affecting the floor height setting when the equipment piping is arranged in a building having a concrete beam or from the inside to the outside of the building, A general method is to provide a through hole 2 for inserting the pipe 3 in the abdomen of a concrete beam (hereinafter simply referred to as “beam”) 1 that connects 4 and 4.

  When the through-hole 2 is provided in the beam 1, the shear strength of the beam 1 is reduced due to the reduction of the cross-section and the concentration of stress around the through-hole. A method of reinforcing with a material is generally used.

  As the shear reinforcing material, for example, as shown in FIGS. 11A to 11C, there is an annular reinforcing member 10 surrounding the periphery of the through hole 2 provided in the beam 1.

  In this type of annular reinforcing member 10, initial shear cracks that occur when shear stress is applied to the beam 1 are shown in the cross section shown in FIG. Since it progresses in four directions along a line of about 45 degrees with respect to the direction, a shear reinforcement material that is oriented in a direction substantially orthogonal to the initial shear crack is arranged to increase the reinforcement effect. Is. The shear reinforcement material suppresses the development of shear cracks due to the adhesive force with concrete (see, for example, Patent Document 1).

Further, as described above, the provision of the through hole 2 in the beam 1 makes it possible to produce a staggered line particularly when the height (width in the upper limit direction) of the beam is large or when the diameter of the through hole 2 is large. 7 may become sparse.
That is, sandwiching the portion where the through hole 2 is interposed, the distance between the stirrups 7 and 7 adjacent to each other in the beam axis direction (see FIG. 11A) becomes long, and the concrete in the upper and lower portions of the through hole is Since it is not restrained by the stirrup, the main muscle may be buckled in this state.

  For this reason, in Patent Document 2, as shown in FIGS. 12 (a) and 12 (b), a plurality of auxiliary reinforcing members 8 arranged in parallel with the stirrup muscle 7 are arranged above and below the through hole 2, respectively. Is disclosed.

The auxiliary reinforcing member 8 is fixed to the upper and lower portions of the beam 1 so as to be stretched between the main bar 6 and the auxiliary bar 9 that are juxtaposed in the vertical direction. That is, as shown in FIG. 12 (c), the U-shaped members in side view are inserted from both sides in the width direction and locked to the main muscle 6 and the auxiliary muscle 9.
Here, the main reinforcing bars 6 are arranged in the beam axis direction near the upper surface or the lower surface of the beam 1, and may be composed of two upper and lower main reinforcing bars 6a and 6b as shown in the figure. The auxiliary bars 9 are arranged in the beam axis direction closer to the through hole 2 than the main bars 6 (see, for example, Patent Document 2).

  Furthermore, a technique is also disclosed in which a plurality of auxiliary reinforcing members 8 arranged along the stirrups 7 are fixed to a cylindrical member (steel pipe) for forming the through hole 2 by welding (for example, Patent Documents). 3).

JP 2008-175021 A Japanese Patent Application Laid-Open No. 07-207837 JP 2007-51533 A

  In the auxiliary reinforcing member 8 (see FIG. 12) shown in Patent Document 2, a plurality of U-shaped reinforcing bars are inserted from both sides of the beam 1 in the width direction above and below the through hole 2.

  For this reason, there is a problem that the number of members increases, the number of locking points to the main bars, etc., and the number of points for the bundling work increase, and the work is complicated.

  In addition, the auxiliary reinforcing member described in Patent Document 3 is required to have considerable accuracy in welding with the steel pipe constituting the through hole 2. Moreover, the labor of welding is considerable, and it is necessary to manufacture for each part according to the positional relationship between the main reinforcement of the bar arrangement part and the steel pipe.

  SUMMARY OF THE INVENTION Accordingly, the present invention has an object to easily enable the reinforcement reinforcing member to be arranged in a portion where the density of the stirrup is sparse in the upper part or the lower part of the through hole of the beam and counters the buckling of the main reinforcement. And

  In order to solve the above-mentioned problems, the present invention provides a main bar arranged in the beam axis direction of the beam, a rib bar arranged around the main bar, and a beam width direction of the beam. An auxiliary reinforcing member that is locked to the main bar above or below the through hole, and the auxiliary reinforcing member includes a locking part that is locked to the main bar of the beam, and an engagement thereof. A reinforcing portion extending from the stop portion to both sides in the beam axis direction and gradually approaching the beam axis passing through the center of the through hole in the beam height direction, and the reinforcing portion has a height of a portion closest to the beam axis Is located between the height of the main bar which locked the locking part and the height of the outer edge of the through hole closest to the main bar, the bar arrangement structure around the through hole of the concrete beam It was adopted.

  That is, when the auxiliary reinforcing member is provided above the through hole, the auxiliary reinforcing member extends to both sides of the beam axial direction from the locking portion locked to the main bar at the top of the beam. Each of the reinforcing portions is configured to be positioned above the height of the upper edge of the through hole. Further, when the auxiliary reinforcing member is provided below the through hole, the auxiliary reinforcing member extends to both the beam axial direction from the locking portion locked to the main bar at the lower portion of the beam. Each of the reinforcing portions has a configuration in which the uppermost portion thereof is positioned below the height of the lower edge of the through hole.

According to these configurations, since the auxiliary reinforcing member extends in both the beam axis directions with the locking portion to the main bar interposed therebetween, the auxiliary reinforcing member has a good balance on both sides with respect to the locking portion.
For this reason, once the locking portion is locked to the main muscle, the posture of the auxiliary reinforcing member is less likely to change thereafter. Therefore, the auxiliary reinforcing member can be easily fixed.

  As described above, the auxiliary reinforcing member may be provided above the through hole, or may be provided below the through hole, and further above and below the through hole. May be provided respectively.

  Further, in each of the above configurations, an auxiliary bar extending in the beam axis direction of the beam is disposed on the beam height direction center side of the main bar that has locked the locking part, and the second locking part is disposed on the reinforcing part. It is possible to adopt a configuration in which the second locking portion is locked to the auxiliary muscle.

  Since the auxiliary reinforcing member sandwiches the locking portion to the main bar and extends in both the beam axial directions, and has a second locking portion to the auxiliary bar ahead of it, when arranging the auxiliary reinforcing member For example, before arranging the auxiliary muscle, by locking the locking portion to the main reinforcement already arranged, and then inserting the auxiliary muscle to a predetermined position along the beam axis direction, The second locking portion of the auxiliary reinforcing member can be locked to the auxiliary muscle.

  Alternatively, when arranging the auxiliary reinforcing member, the order of the main reinforcement and the auxiliary reinforcement may be reversed. That is, for example, before arranging the main bar, the second locking part of the auxiliary reinforcing member is locked to the already arranged auxiliary bar, and then the main bar is set in a predetermined direction along the beam axis direction. By inserting to the position, the locking portion of the auxiliary reinforcing member can be locked to the main muscle.

  At this time, once the second locking portion of the auxiliary reinforcing member is locked to the auxiliary muscle, the posture of the auxiliary reinforcing member is less likely to change thereafter. Therefore, the auxiliary reinforcing member can be easily fixed.

  In addition, the said latching | locking part of an auxiliary reinforcement member and the 2nd latching part should just have the function which can latch the auxiliary reinforcement member to a main reinforcement or an auxiliary reinforcement, for example, in a part of auxiliary reinforcement member A hook-shaped member may be attached by welding or the like, and the hook-shaped member may be hooked to the main or auxiliary muscle, or a part of the auxiliary reinforcing member may be tied with a wire or the like and locked to the main or auxiliary muscle. And the latched part is good also as the said latching | locking part and a 2nd latching | locking part.

  Further, the auxiliary muscle is a reinforcing bar arranged along the main muscle to be locked with the locking portion, on the center side in the beam height direction from the main muscle, that is, on the through hole side. May be a relatively short bar arrangement arranged only in a portion where the through hole is interposed, or may be a relatively long bar arrangement arranged over the entire length of the beam. In addition, when a plurality of main bars are provided in parallel in the beam height direction above or below the through hole, the one that is far from the through hole among the parallel main bars is to be locked. The main muscle and the one closer to the through hole can be used as the aforementioned auxiliary muscle.

  In each of these configurations, the auxiliary reinforcing member is configured by a shaft-shaped member or a plate-shaped member, and the locking portion and the second locking portion include the shaft-shaped member or the plate-shaped member. A configuration in which an inner side surface of the bent portion formed by bending abuts on the main muscle or the auxiliary muscle can be employed.

  If the auxiliary reinforcing member is configured to be locked to the main bar or the auxiliary bar by the bent portion of the shaft-like member or the plate-like member, the auxiliary reinforcing member can be easily manufactured, and the locking operation at the time of bar arrangement is also possible. Easy.

  The auxiliary reinforcing member includes a plurality of the locking portions, extends from one of the locking portions and extends toward the other locking portion, and extends from the other locking portion to the one of the locking portions. It is possible to adopt a configuration in which the reinforcing portion heading toward the locking portion is connected by a connecting portion.

  At this time, for example, a second locking portion to the auxiliary muscle can be provided in each of the reinforcing portions that are directed from the two adjacent locking portions in the direction opposite to the central connection portion side.

  The auxiliary reinforcing member includes a plurality of the locking portions, extends from one of the locking portions and extends toward the other locking portion, and extends from the other locking portion to the one of the locking portions. A configuration including the second locking portion between the reinforcing portion facing the locking portion can be employed.

  In this case, for example, a second locking portion to the auxiliary muscle can be provided in each of the reinforcing portions that are directed from the two adjacent locking portions in the direction opposite to the central second locking portion side. Alternatively, since the second locking portion is interposed between two adjacent locking portions, the reinforcement portion heading in the direction opposite to the central second locking portion side omits the installation of the second locking portion. Is also possible.

  In any of these configurations, since a plurality of locking portions to the main bar are provided along the beam axis direction, the locking of the auxiliary reinforcing member to the main bar is further stabilized.

Furthermore, in each of these configurations, it is possible to employ a configuration in which a plurality of the auxiliary reinforcing members are locked in parallel to the same main reinforcing bar in the beam axis direction.
For example, if there are two auxiliary reinforcing members with one locking part, or three or more auxiliary reinforcement members in parallel in the beam axis direction when the diameter of the through hole is particularly large, etc. You may stop, and you may arrange | position two or more auxiliary reinforcement members provided with the two latching | locking parts in parallel similarly with respect to one main reinforcement.

  According to the present invention, the auxiliary reinforcing member provided in the portion where the density of the stirrup is sparse can be easily fixed above or below the through hole of the beam.

Front sectional view of one embodiment Side sectional view of FIG. The detail of the auxiliary reinforcement member of one Embodiment is shown, (a) is a top view, (b) is a left view, (c) is a front view, (d) is a right view, (e) is a bottom view, ( f) Back view 3 is a perspective view of the auxiliary reinforcing member of FIG. The detail of the auxiliary reinforcement member of other embodiment is shown, (a) is a top view, (b) is a front view, (c) is a right view, (d) is a bottom view. FIG. 5 is a perspective view of the auxiliary reinforcing member of FIG. Front sectional view showing still another embodiment The details of the auxiliary reinforcing member of the embodiment of FIG. 7 are shown, (a) is a plan view, (b) is a left side view, (c) is a front view, (d) is a right side view, and (e) is a bottom view. , (F) is a rear view Still another embodiment is shown, (a) is a front sectional view, (b) is a right side view of (a). Explanatory drawing showing an example of concrete beam construction with through holes A conventional example is shown, (a) is a front view, (b) is a side view, and (c) is a front view of an annular reinforcing member. A conventional example is shown, (a) is a front view, (b) is a side view, and (c) is an explanatory diagram when reinforcing members are arranged.

  An embodiment of the present invention will be described with reference to FIGS. In the bar arrangement structure around the through hole of the concrete beam of this embodiment, the periphery of the through hole 2 provided in the beam 1 (for example, see FIG. 10) connecting the columns 4 and 4 is reinforced by the annular reinforcing member 10. Further, the upper and lower sides of the through-hole 2 are reinforced by the auxiliary reinforcing member 20, respectively.

In the annular reinforcing member 10, when an initial shear crack generated when a shear stress is applied to the beam 1 propagates around the through hole 2, a predetermined member is positioned in a direction intersecting the initial shear crack. Are arranged to be.
That is, the annular reinforcing member 10 suppresses the development of shear cracks that are likely to occur around the through hole 2 due to the adhesive force with the concrete.

  1 and 2 show a part of the bar arrangement state in the beam 1. Reference numeral 6 shown in the figure denotes a main bar, and reference numeral 7 denotes a stirrup (shear reinforcement) wound around the main bar 6 and fixed.

  The through hole 2 of the beam 1 is provided such that the direction of the hole center line is orthogonal to the length direction of the beam 1 (the beam axis direction of the beam 1). The above-described annular reinforcing members 10 are arranged at two positions on the front and back of the beam 1 along the length direction of the hole 2 (the beam width direction of the beam 1). As shown in FIG. 2, each of the annular reinforcing members 10 is disposed so as to surround the through-hole 2 while securing a predetermined covering on each of the beam width direction surface side and the back surface side of the beam 1. These are fixed to the stirrups 7 on the corresponding side by a binding material such as a wire.

  As shown in FIGS. 1 and 2, the main bars 6 are arranged in the beam axis direction near the upper surface or the lower surface of the beam 1. In this embodiment, two main bars 6a and 6b arranged in the vertical direction are taken as a set, and the two main bars 6a and 6b are respectively connected to the front side and the back side of the beam 1 in the beam width direction above and below the through hole 2 respectively. On the side.

  Further, auxiliary bars 25 extending in the beam axis direction are provided closer to the through hole 2 than the main bars 6 (on the center side in the beam height direction). The auxiliary bars 25 are provided along the main bars 6 on the upper and lower sides of the through-hole 2 on both the front and back sides in the beam width direction.

  Further, in this embodiment, the auxiliary bars 25 are not provided over the entire length of the beam 1 but are constituted by horizontal bars having a length L in the beam axis direction provided only in the vicinity of the through hole 2. Since the auxiliary muscle 25 has a short length, it can be easily fixed to the rib muscle 7.

  The auxiliary reinforcing member 20 is stretched between the main reinforcement 6 and the auxiliary reinforcement 25. The auxiliary reinforcing member 20 is also provided on both the front and back sides in the beam width direction above and below the through hole 2 in the same manner as the auxiliary bar 25.

  As shown in FIGS. 3 and 4, the auxiliary reinforcing member 20 is configured by a single continuous reinforcing bar (shaft-shaped member). In addition, the material of this shaft-shaped member is free, and materials other than the reinforcing bar used in this embodiment may be used. For example, you may use what impregnated uncured resin to the continuous fiber and hardened the resin.

  As shown in FIGS. 2 and 3, the auxiliary reinforcing member 20 includes two locking portions 21 that serve as locking portions to the main muscle 6 in the middle of the axial direction of the shaft-shaped member. . The locking portion 21 is composed of a bent portion 21a provided on the shaft-like member.

Further, the auxiliary reinforcing member 20 includes reinforcing portions 22 and 22 that extend from the locking portion 21 to the main reinforcement 6 to both sides in the beam axis direction and gradually approach the beam axis M shown in FIG. The beam axis M indicates a virtual line extending in parallel to the beam axis direction of the beam 1 through the center of the through hole 2 in the beam height direction in the front view of the beam 1.
In this embodiment, the reinforcing portions 22 are linear reinforcing portions 22 and 22 in an oblique direction that extend from the locking portion 21 to both sides in the beam axis direction and gradually approach the auxiliary reinforcement 25, respectively.

  Furthermore, the 2nd latching | locking part 23 latched by the said auxiliary | assistant muscle 25 is each provided in the front-end | tip of each reinforcement part 22 and 22. FIG. This 2nd latching | locking part 23 is also comprised by the bending part 23a provided in the said shaft-shaped member.

  In this embodiment, the auxiliary reinforcing member 20 includes a plurality (two) of the locking portions 21, and extends from one locking portion 21 between the two locking portions 21 and 21, and the other locking member. The reinforcing portion 22 toward the stop portion 21 side and the reinforcing portion 22 extending from the other locking portion 21 and toward the one locking portion 21 side are connected by a connecting portion 24. The connection part 24 is also comprised by the bending part 24a provided in the said shaft-shaped member.

  That is, the auxiliary reinforcing member 20 includes the second locking portion 23, the reinforcing portion 22, the locking portion 21, the reinforcing portion 22, the connecting portion 24, the reinforcing portion 22, the locking portion 21, and the reinforcing member in order along the beam axis direction. The part 22 and the second locking part 23 are arranged.

  Since the auxiliary reinforcing member 20 is formed by bending a shaft-shaped member, the bent portions 21a and 23a constituting the locking portion 21 and the second locking portion 23 are the inner portions of the bent portions 21a and 23a. The side surface is locked to the main muscle 6 or the auxiliary muscle 25 by contacting the main muscle 6 or the auxiliary muscle 25.

  In this embodiment, the reinforcing portion 22 is configured by a linear inclined portion extending in a direction intersecting with the beam axis direction and the beam height direction. A portion extending in the vertical direction perpendicular to the beam axis direction, a portion extending in parallel with the beam axis direction, or the like partially intervenes in the middle of connecting 21 and the second locking portion 23, or It may be accompanied by a bent portion. For this reason, for example, a staircase-shaped reinforcing portion 22 in which portions extending in the vertical direction perpendicular to the beam axis direction and portions extending in parallel in the beam axis direction may be alternately arranged.

  When the auxiliary reinforcing member 20 is arranged at the upper part of the through hole 2, the length of the lower end of the reinforcing part 22 exceeds the upper end of the through hole 2 (the uppermost position of the outer peripheral surface). Not necessarily required. In addition, when the auxiliary reinforcing member 20 is disposed in the lower part of the through hole 2, the length so that the upper end of the reinforcing part 22 exceeds the lower end of the through hole 2 (the lowest position on the outer peripheral surface) is necessarily required. Absent. This is because the auxiliary reinforcing member 20 reinforces the non-muscle portion above or below the through hole 2.

  That is, the reinforcing portion 22 of the auxiliary reinforcing member 20 has the height of the portion closest to the beam axis M, the height of the main bar 6 that locks the locking portion 21, and the through hole that is closest to the main bar 6. 2 is located between the height of the outer edge.

In this embodiment, the bent portions 21a and 23a are formed in an arc shape so as to connect the reinforcing portions 22 and 22 on both sides, and the surface facing the inner side of the arc is the main muscle 6 (in this example) Then, the auxiliary reinforcing member 20 is locked to the main muscle 6 in a state where it abuts on the main muscle 6 a) or the auxiliary muscle 25. That is, as shown in FIGS. 3B and 3D, the bent portions 21a and 23a are U-shaped in a side view.
For example, the bent portions 21a and 23a may be formed by joining separate members by welding rather than by bending. Therefore, the bent portions 21a and 23a are not limited to those formed in an arc shape, for example, You may employ | adopt the structure bent in acute angle shape, such as side view V shape.

  Further, in this embodiment, as shown in FIGS. 3C and 3F, the angle formed between the reinforcing portions 22 and 22 is 60 degrees, and the auxiliary reinforcing member 20 as a whole is a mountain shape that is isosceles in front view. The shape is continuous. In addition, this angle is not limited to 60 degrees, For example, you may set to other angles, such as 90 degrees.

  In this embodiment, the shaft-like member has the same diameter over the entire length, and the members on both sides have the same weight and the same length with the center between the two locking portions 21 and 21 interposed therebetween. Is formed. For this reason, the balance of the auxiliary reinforcing member 20 is good, which is effective in stabilizing the posture of the auxiliary reinforcing member 20, and both sides of the through hole 2 in the beam axis direction can be evenly reinforced.

The construction method of this embodiment will be described. First, normal reinforcement necessary for the concrete beam 1 is performed. That is, a cylindrical member and an annular reinforcing member 10 for forming the main reinforcement 6, the stirrup 7 and the through-hole 2 are arranged in a mold (not shown).
This arrangement method is as usual, and a plurality of main reinforcing bars 6 are arranged in parallel at the upper and lower portions of the beam 1 along the beam axis direction. Further, the streaks 7 are arranged in the direction orthogonal to the main bars 6. The stirrups 7 are arranged at a predetermined interval along the beam length direction, and the positions of the through holes 2 are avoided.

  The annular reinforcement member 10 is inserted into the space surrounded by the ribs 7 from the gap between the ribs 7 and the ribs 7, and the annular reinforcement member 10 is fixed around the through hole 2. The annular reinforcing member 10 can be fixed to the ribs 7 with a binding material such as a wire.

  Next, the auxiliary reinforcing member 20 is disposed at a predetermined location. As shown in FIG. 4, the auxiliary reinforcing member 20 includes two locking portions 21 and 21 along the beam axis direction. It is inserted from the upper side to the lower side so as to be caught by the main muscle 6. Moreover, about the lower part of the through-hole 2, it inserts toward the upper part from the downward direction so that the latching | locking parts 21 and 21 may be hooked on the main reinforcement 6. FIG.

  Thereafter, the auxiliary muscle 25, which is a horizontal streak, is inserted into the space surrounded by the stirrup muscle 7 from the gap between the stirrup muscle 7. The auxiliary muscle 25 can be fixed to the loose muscle 7 and the like with a binding material such as a wire.

  By inserting the auxiliary muscle 25, the auxiliary reinforcing member 20 is locked to the main muscle 6 and the auxiliary muscle 25 and fixed so as not to move to a predetermined position. At this time, the center between the two locking portions 21 and 21 is set to be directly above the through hole 2. That is, the arrangement of the auxiliary reinforcing member 20 is symmetric in the beam axis direction with respect to a vertical line passing through the center of the through hole 2.

  As described above, the auxiliary reinforcing member provided with the locking portion 21 to the main muscle 6 and the second locking portion 23 to the auxiliary muscle 25 above and below the through hole 2 disposed in the beam 1, respectively. Since 20 is arranged, easy arrangement is possible above and below the through hole 2 where the arrangement of the ribs 7 tends to be sparse.

In particular, in the case of the auxiliary reinforcing member 20 that is locked to the main muscle 6 above the through-hole 2, the auxiliary reinforcing member 20 is supported so as to hang down by its own weight by the locking portion 21 being locked to the main muscle 6. Is done.
For this reason, since it arrange | positions in a predetermined direction, even if an operator does not lift and change direction separately, arrangement | positioning of the auxiliary reinforcement member 20 and fixing work become remarkably easy.

  In addition, you may make it the said latching | locking part 21 and the 2nd latching | locking part 23 of the auxiliary | assistant reinforcement member 20 latch to the several main reinforcement 6 paralleled in a beam width direction.

  Another embodiment is shown in FIGS. In this embodiment, since the auxiliary reinforcing member 20 includes a plurality (two) of the locking portions 21, between the two locking portions 21 and 21, the auxiliary reinforcing member 20 extends from one locking portion 21 and the other. Between the reinforcing portion 22 toward the locking portion 21 and the reinforcing portion 22 extending from the other locking portion 21 and toward the one locking portion 21. 23.

  That is, the auxiliary reinforcing member 20 includes, in order along the beam axis direction, the second locking portion 23, the reinforcing portion 22, the locking portion 21, the reinforcing portion 22, the second locking portion 23, the reinforcing portion 22, and the locking portion. 21, a reinforcing part 22 and a second locking part 23 are arranged.

  Since the other configuration relating to the auxiliary reinforcing member 20, the construction method thereof, and the like are the same as those in the above-described embodiment, the description thereof is omitted.

  Yet another embodiment is shown in FIGS. In this embodiment, two auxiliary reinforcing members 20 each having one locking portion 21 are locked in parallel to the same main reinforcement 6 in the beam axis direction.

  In this embodiment, the position of the through-hole 2 is arranged eccentrically slightly downward with respect to the beam height direction. That is, the position of the beam axis M parallel to the beam axis direction passing through the center of the through hole 2 is located slightly below the center of the beam 1 in the beam height direction. For this reason, the auxiliary reinforcing member 20 is provided only in the upper part of the through hole 2.

  As shown in FIG. 7, the auxiliary reinforcing member 20 includes reinforcing portions 22 and 22 that extend from the locking portion 21 to the main reinforcement 6 to both sides in the beam axis direction and gradually approach the beam axis M. A second locking portion 23 to the auxiliary muscle 25 is provided at the tip of the reinforcing portion 22.

  That is, in the auxiliary reinforcing member 20, the second locking portion 23, the reinforcing portion 22, the locking portion 21, the reinforcing portion 22, and the second locking portion 23 are arranged in order along the beam axis direction.

  By arranging a plurality of the auxiliary reinforcing members 20 in parallel along the beam axis direction, for example, when the diameter of the through hole 2 is relatively large, the upper portion or the lower portion of the through hole 2 in which the stirrup 7 is sparse. Even if the reinforcing range of the above is wide, it can be easily handled by increasing the number of the auxiliary reinforcing members 20 arranged. That is, there is no need to prepare auxiliary reinforcing members 20 having various shapes.

  Further, the two auxiliary reinforcing members 20 and 20 arranged in parallel are arranged such that the second locking portions 23 and 23 are overlapped with each other in the beam axis direction in the front view shown in FIG. In the overlapping portion, the second locking portion 23 of one auxiliary reinforcing member 20 is wound around the auxiliary bar 25 from one side to the other side in the beam width direction. The second locking portion 23 is wound around the auxiliary bar 25 from the other side in the beam width direction toward the one side.

  In this way, in the overlapping portion, by making the direction of the overlapping second locking portions 23, 23 opposite to the beam width direction, the work at the time of bar arrangement is facilitated and orderly bar arrangement is made. It is possible.

  Since the other configuration relating to the auxiliary reinforcing member 20, the construction method thereof, and the like are the same as those in the above-described embodiment, the description thereof is omitted.

  Yet another embodiment is shown in FIG. In this embodiment, the auxiliary reinforcing member 20 of the embodiment shown in FIGS. 5 and 6 is applied to the beam 1 in which the position of the through hole 2 is eccentric with respect to the beam height direction.

  In this embodiment, since the position of the through hole 2 is arranged slightly eccentric with respect to the beam height direction, the position of the beam axis M parallel to the beam axis direction passing through the center of the through hole 2 is 1 is located slightly above the center in the beam height direction.

  The auxiliary reinforcing member 20 is provided only at the upper part of the through hole 2. Further, at the lower part of the through hole 2, a reinforcing member 26 parallel to the rib 7 that connects the main bar 6 located at the lowest part of the beam 1 and the auxiliary bar 25 provided immediately below the through hole 2 is arranged. Yes.

  Since the other configuration relating to the auxiliary reinforcing member 20, the construction method thereof, and the like are the same as those in the above-described embodiment, the description thereof is omitted.

  In any of the embodiments, the auxiliary reinforcing member 20 may be a plate-like member instead of the above-described shaft-like member. In the case where a plate-like member is employed as the auxiliary reinforcing member 20, when the locking portion 21 and the second locking portion 23 are formed by the bent portions 21a and 23a, the bending is the plate surface of the flat plate-like member. If the bent portion is bent so as to be bent, it can be easily manufactured.

In each of these embodiments, the auxiliary bar 25 is not provided over the entire length of the beam 1 but is configured with a horizontal bar having a length L in the beam axis direction provided only in the vicinity of the through hole 2. The auxiliary bars 25 may be provided over the entire axial length of the beam 1 in the same manner as the main bars 6. Alternatively, one of the plurality of main muscles 6 arranged in parallel vertically may be used as the auxiliary muscle 25.
Further, the auxiliary reinforcing member 20 may be provided both above and below the through hole 2 or may be provided either above or below.

In each of these embodiments, the auxiliary reinforcing member 20 is provided with two locking portions 21 for the main reinforcement 6 along the beam axis direction. However, three or more locking portions 21 are provided along the beam axis direction. It may be provided. At this time, the connecting portion 24 described above may be provided between the two engaging portions 21, 21 adjacent in the beam axis direction, or the second engaging portion 23 described above may be provided.
On the contrary, it is good also as the auxiliary reinforcement member 20 which provided only the latching | locking part 21 with respect to the main reinforcement 6 along the beam-axis direction. At this time, the 2nd latching | locking part 23 may be provided in one among the reinforcement parts 22 and 22 extended from the latching | locking part 21 to a beam axial direction both sides, and may be provided in both.

Further, it is possible to adopt a configuration in which a plurality of auxiliary reinforcing members 20 having these respective configurations are locked in parallel to the same main reinforcement 6 in the beam axis direction.
For example, two auxiliary reinforcing members 20 of the above-described embodiments each having one or more locking portions 21 are provided for one main muscle 6 at the upper and / or lower portions of the through-hole 2. Alternatively, three or more may be locked in parallel in the beam axis direction.

1 Beam (concrete beam)
2 Through-hole 3 Piping 4 Column 6, 6a, 6b Main bar 7 Stirrup (shear reinforcement)
8 Auxiliary reinforcement member 9 Auxiliary reinforcement 10 Annular reinforcement member 20 Auxiliary reinforcement member 21 Locking portion 22 Reinforcement portion 23 Second locking portion 24 Connection portions 21a, 23a, 24a Bending portion 25 Auxiliary muscle

Claims (5)

A main reinforcement (6) arranged in the beam axis direction of the beam (1), a stirrup (7) arranged around the main reinforcement (6), and the beam (1) A through hole (2) extending in the beam width direction, and an auxiliary reinforcing member (20) locked to the main reinforcement (6) is provided above or below the through hole (2),
The auxiliary reinforcing member (20) includes a locking portion (21) locked to the main bar (6) of the beam (1), and extends gradually from the locking portion (21) to both sides in the beam axis direction. A reinforcing portion (22, 22) that approaches the beam axis (M) passing through the center of the through hole (2) in the beam height direction, and the reinforcing portion (22) is closest to the beam axis (M). The height of the portion is located between the height of the main bar (6) locking the locking part (21) and the height of the outer edge of the through hole (2) closest to the main bar (6). Reinforcement structure around the through hole of the concrete beam.   An auxiliary bar (25) extending in the beam axis direction of the beam (1) is disposed on the beam height direction center side of the main bar (6) locking the locking part (21), and the reinforcing part (22). The second locking portion (23) is provided in the second locking portion (23), and the second locking portion (23) is locked to the auxiliary reinforcement (25). The surrounding reinforcement structure.   The auxiliary reinforcing member (20) is composed of a shaft-shaped member or a plate-shaped member, and the locking portion (21) and the second locking portion (23) are the shaft-shaped member or plate-shaped member. The periphery of the through hole of the concrete beam according to claim 2, wherein an inner side surface of the bent portion formed by bending the member is in contact with the main reinforcement (6) or the auxiliary reinforcement (25). Reinforcement structure.   The auxiliary reinforcing member (20) includes a plurality of the locking portions (21), and extends from one locking portion (21) to the other locking portion (21) and the reinforcing portion (22). The reinforcing portion (22) extending from the other locking portion (21) toward the one locking portion (21) is connected by a connecting portion (24). A bar arrangement structure around a through hole of the concrete beam according to any one of 1 to 3.   The concrete beam according to any one of claims 1 to 4, wherein a plurality of the auxiliary reinforcing members (20) are locked in parallel to the same main reinforcement (6) in the beam axis direction. The bar arrangement around the through hole.

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