JP5610262B2 - Reinforcement structure around through hole of concrete beam - Google Patents

Description

  The present invention relates to a reinforcing material around a through hole provided in a reinforced concrete beam or a steel reinforced concrete beam.

  For example, as shown in FIG. 12, in order to prevent the piping from affecting the floor height setting when the equipment piping is arranged in a building having concrete beams 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, so that the reinforcement around the through-hole 2 such as a reinforcing bar or a welded wire mesh is provided. A method of reinforcing with a material is generally used.

  As the shear reinforcing material, for example, as shown in FIGS. 13A to 13C, there is an annular reinforcing member 10 that surrounds 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 suppresses the development of shear cracks due to the adhesive force with concrete.

  In addition to the annular reinforcing member 10, a technique for disposing an oblique reinforcing member 11 as a shear reinforcing material is disclosed.

  For example, as shown in FIGS. 14 (a) to 14 (c), the diagonal reinforcing member 11 has a hook portion 11a formed by bending one end of a linear shaft member. The diagonal reinforcing member 11 made of this shaft-shaped member has its hook portion 11a locked to the main reinforcing bars 6 at the ends in the beam width direction among the main reinforcing bars 6 positioned above and below the through hole 2 respectively. Yes. Further, as shown in FIGS. 14 (a) to 14 (c), the straight bar portion 11b at the other end has an oblique reinforcing member 11 locked to the upper main muscle 6 in an oblique direction (beam axis direction and beam). The diagonal reinforcing member 11 that extends downward (obliquely with respect to the height direction) and is locked to the main reinforcing bar 6 positioned below extends upward in the oblique direction (in the direction of the beam axis and the direction of the beam height). (For example, refer patent document 1).

  Further, as the diagonal reinforcing member 11 having another configuration, there is one shown in FIGS. 15 (a) and 15 (b). The diagonal reinforcing member 11 includes two linear shaft members arranged in parallel to form a straight bar portion (shear reinforcing portion) 11b, and one end of the straight bar portion 11b is connected to each other by a linear shaft member. It is connected at the part 11c, and has a U-shaped appearance as a whole. The oblique reinforcing member 11 can be manufactured by bending one continuous shaft member. In addition, the other end of the two straight rod portions 11b is bent to increase the degree of fixing to the surrounding concrete, and serves as a retaining portion 11d (see, for example, Patent Document 2).

JP-A-8-184127 (page 4, Fig. 1-3) JP 2002-364119 A (page 7-8, FIG. 1-6)

  Since the diagonal reinforcing member 11 shown in FIG. 14 is mainly composed of a linear shaft-like member, the four-direction shear cracks (reference numeral 5 in FIG. 13) that may occur around the through-hole 2 of the beam 1. Corresponding to the arrows shown), it is necessary to dispose the diagonal reinforcing members 11 in the four directions.

  That is, as shown in FIG. 14 (a), two diagonal reinforcing members 11 are locked to one main reinforcement 6 located above the through hole 2, and one of them sandwiches the through hole 2. One is arranged obliquely downward in one direction of the beam axis, and the other is arranged obliquely downward in the other direction of the beam axis. In addition, two diagonal reinforcing members 11 are locked to one main reinforcing bar 6 located below the through hole 2, and one of them is directed diagonally upward in one direction along the beam axis with the through hole 2 interposed therebetween. The other is arranged obliquely upward in the other direction of the beam axis. For this reason, in the cross section shown in FIG. 14A, a set of four diagonal reinforcing members 11 is arranged.

  Further, the set of four diagonal reinforcing members 11 is arranged on the front side and the back side in the beam width direction along the direction in which the through hole 2 extends, as shown in FIG. Therefore, the number of the oblique reinforcing members 11 arranged with respect to one through hole 2 is further increased.

As described above, the diagonal reinforcing member 11 shown in FIG. 14 has a problem that a large number of the diagonal reinforcing members 11 must be arranged for one through hole 2.
If the number of the diagonal reinforcing members 11 is large, the fixing work is complicated. This is because, for example, the diagonal reinforcing member 11 needs to be fixed such that the bent hook portion 11a is locked to the main reinforcement 6 and is tied and fixed with a wire or the like so as not to move in a predetermined position and a predetermined direction.

  In this respect, the diagonal reinforcing member 11 shown in FIG. 15 has a U-shape in which one end of two parallel straight bar portions 11b is connected by a linear connecting portion 11c. Both functions of the diagonal reinforcing member 11 to be provided on the front surface side and the back surface side in the width direction can be exhibited. That is, the number of the oblique reinforcing members 11 can be reduced.

  However, the U-shaped oblique reinforcing member 11 has the straight bar portion 11b after the linear connecting portion 11c is bridged (latched) between the plurality of main bars 6 arranged in parallel in the beam width direction. Must be fixed in a state in which the direction of the straight bar portion 11b is maintained, for example, by lifting the other end so that the angle is oblique to the beam axis direction and the beam height direction. In particular, in order to uniformly reinforce the periphery of the through hole, it is necessary to dispose each diagonal reinforcing member so as to form the same angle with respect to the beam axis direction. Such a fixing operation is complicated as in the case of the oblique reinforcing member 11 shown in FIG.

  Therefore, an object of the present invention is to make it possible to easily fix an oblique reinforcing member.

  In order to solve the above-described problems, the present invention provides a beam having a plurality of main bars arranged in the beam axis direction of the beam, a stirrup arranged around the main bars, and a rib of the beam. A through hole extending in the beam width direction; and an annular reinforcing member surrounding the through hole; and an oblique reinforcing member locked to the main bar above or below the through hole. And a shear reinforcement portion extending from the locking portion to both sides in the beam axis direction of the through hole and gradually approaching the center in the beam height direction. A reinforcing structure around the through hole was adopted.

  Since the shear reinforcement part that has a function to counter shear cracks generated around the through hole extends in both the beam axis direction with the locking part interposed therebetween, the diagonal reinforcing member has a balance on both sides with the locking part in between. Good. For this reason, once the locking portion is locked to the main reinforcement, the posture of the diagonal reinforcing member is less likely to change thereafter. Therefore, the diagonal reinforcing member can be easily fixed.

  In this configuration, the locking portion of the diagonal reinforcing member only needs to have a function of locking the diagonal reinforcing member to the main reinforcement. For example, a hook-shaped member is attached to a part of the diagonal reinforcing member by welding or the like. Then, the hook-shaped member may be hooked on the main bar, or a part of the diagonal reinforcing member may be tied to the main bar with a wire or the like, and the locked part may be used as the locking part.

  In each of these configurations, the diagonal reinforcing member may employ a configuration in which members on both sides are formed symmetrically and with equal weights with the locking portion interposed therebetween. This configuration is more advantageous in stabilizing the posture of the diagonal reinforcing member.

  That is, the shear reinforcement portions on both sides sandwiching the locking portion, or if the auxiliary shear reinforcement portions are provided, the shear reinforcement portions on the both sides and the auxiliary shear reinforcement portions are symmetrical in the beam axis direction. In other words, it is effective to stabilize the posture of the oblique reinforcing member that the same shape and the same length are formed. Of course, it is most desirable that both of them are formed to have the same weight.

In each of these configurations, the diagonal reinforcing members are respectively arranged above and below the through hole, and the ends of the respective shear reinforcing portions of the upper and lower diagonal reinforcing members reach the center in the height direction of the beam. In the front view, a configuration in which the upper and lower diagonal reinforcing members are arranged so as to surround the periphery of the through hole can be employed.
In this way, the periphery of the through hole is surely surrounded by the upper and lower diagonal reinforcing members, so that a high reinforcing effect can be expected.

  Moreover, the following structure can also be employ | adopted for a diagonal shear reinforcement member. In other words, the configuration includes a plurality of main bars arranged in the beam axis direction of the beam, a stirrup arranged around the plurality of main bars, and a through hole extending in the beam width direction of the beam. And an annular reinforcing member that surrounds the through hole, and an oblique reinforcing member that is locked to the main bar above or below the through hole, and the diagonal reinforcing member is locked to the main bar and is in the beam axial direction. A pair of engaging portions parallel to each other, a first shear reinforcing portion extending from one of the engaging portions of the pair in the beam axial direction of the through hole and gradually approaching the center in the beam height direction, A second shear reinforcement portion extending from the other end of the locking portion to the other in the beam axis direction of the through hole and gradually approaching the center in the beam height direction, and the oblique reinforcement member is attached to the first shear reinforcement portion. A first auxiliary shear reinforcement disposed along and connected to the first shear reinforcement, the second A second auxiliary shear reinforcement portion disposed along the shear reinforcement portion and connected to the second shear reinforcement portion, wherein the first shear reinforcement portion and the second shear reinforcement portion are The structure connected through one auxiliary shear reinforcement part and said 2nd auxiliary shear reinforcement part is employable.

  In this configuration, the first shear reinforcement portion and the second shear reinforcement portion, which have a function to counter shear cracks generated around the through hole, extend in both the beam axial directions with the pair of locking portions interposed therebetween, respectively. Are connected, the diagonal reinforcing member has a good balance on both sides with the pair of locking portions interposed therebetween. For this reason, once the locking portion is locked to the main reinforcement, the posture of the oblique reinforcing member is less likely to change thereafter. Therefore, the diagonal reinforcing member can be easily fixed.

  In addition, if the first auxiliary shear reinforcement portion and the second auxiliary shear reinforcement portion are provided in this way, the function to counter shear cracks is further enhanced, and the first auxiliary shear reinforcement portion and the second auxiliary shear reinforcement portion are further enhanced. By the reinforcing part, the first shear reinforcing part and the second shear reinforcing part can be connected to serve as a member for integrating the left and right shear reinforcing parts.

  Even in this configuration, the locking portion of the diagonal reinforcing member only needs to have a function of locking the diagonal reinforcing member to the main reinforcement. For example, a hook-shaped member is welded to a part of the diagonal reinforcing member. The hook-shaped member may be hooked to the main bar, or a part of the diagonal reinforcing member may be tied to the main bar by connecting with a wire or the like, and the locked part is used as the locking part. Also good.

  In addition, the diagonal reinforcing member may employ a configuration in which members on both sides are formed symmetrically and equally in weight with respect to the center in the beam axis direction of the pair of locking portions. This configuration is more advantageous in stabilizing the posture of the diagonal reinforcing member.

  That is, the first shear reinforcement part and the second shear reinforcement parts located on both sides of the pair of locking parts, or the first auxiliary shear reinforcement part and the second auxiliary shear reinforcement part. The first auxiliary shear reinforcement and the second auxiliary shear reinforcement located on both sides thereof, and the first shear reinforcement and the second shear reinforcement are in the beam axis direction. It is effective to stabilize the posture of the diagonal reinforcing member, that is, it is most desirable that both of them are formed to have equal weight. .

  Further, in each of these configurations, the diagonal reinforcing members are respectively arranged above and below the through-hole, and the tips of the first shear reinforcing portion and the second shear reinforcing portion (22b) of the upper and lower diagonal reinforcing members are arranged. Each of the beams can reach the center of the beam in the height direction, and the upper and lower diagonal reinforcing members can be disposed so as to surround the periphery of the through hole in a front view of the beam.

  In this way, the periphery of the through hole is surely surrounded by the upper and lower diagonal reinforcing members, so that a high reinforcing effect can be expected.

  Moreover, in each of these configurations, when the diagonal reinforcing member is configured by a shaft-shaped member or a plate-shaped member, the locking portion may be configured by bending the shaft-shaped member or the plate-shaped member.

That is, the configuration is such that the oblique reinforcing member is constituted by a shaft-like member or a plate-like member, and the locking portion is constituted by a bent portion provided on the shaft-like member or the plate-like member. The diagonal reinforcing member may be configured to be locked to the main bar in a state where the inner-facing surface of the portion is in contact with the main bar.
If the diagonal reinforcing member is locked to the main bar by the bent portion of the shaft-like member or the plate-like member, the diagonal reinforcing member can be easily manufactured and the locking operation at the time of bar arrangement is also easy.

Alternatively, as another configuration, the oblique reinforcing member is configured by a shaft-shaped member or a plate-shaped member, and the locking portion includes two bent portions provided on the shaft-shaped member or the plate-shaped member, and 2 It is comprised by the linear part between the said bending parts of the location, and the said diagonal reinforcement member is latched by the said main reinforcement in the state which the surface or the said linear part facing the inner side of the said bending part contact | abutted to the said main reinforcement It can be configured.
According to this configuration, since one diagonal reinforcing member can be locked to a plurality of main bars arranged in parallel in the beam width direction, the posture of the diagonal reinforcing member is easily stabilized. Further, since the straight portion is interposed between the two bent portions, it is possible to suppress a decrease in concrete covering due to the interposition of the diagonal reinforcing member.

  In this invention, since the shear reinforcement portion having a function to counter shear cracks generated around the through-hole extends in both the beam axial directions sandwiching the locking portion, the diagonal reinforcing member sandwiches the locking portion. Good balance on both sides. For this reason, once the locking portion is locked to the main reinforcement, the posture of the oblique reinforcing member is less likely to change thereafter. Therefore, the diagonal reinforcing member can be easily fixed.

Perspective view of one embodiment Front sectional view of one embodiment Side sectional view of FIG. The detail of the diagonal reinforcement member of one Embodiment is shown, (a) is a front view, (b) is a right view of (a), (c) is a perspective view, (d) is a perspective view which shows the modification. 4A, 4B, and 4C show details of the diagonal reinforcing member of the embodiment, where FIG. 4A is a rear view, FIG. 4B is a right side view of FIG. 4A, and FIG. , (D) is a bottom view The principal part perspective view of other embodiment The detail of the diagonal reinforcement member of other embodiment is shown, (a) is a front view, (b) is a side view, (c) (d) is a perspective view. 7A and 7B show details of the diagonal reinforcing member of the embodiment of FIG. 7, wherein FIG. 7A is a rear view, FIG. 7B is a right side view of FIG. 7A, FIG. 7C is a plan view, and FIG. Front sectional view of still another embodiment The detail of the diagonal reinforcement member of embodiment of FIG. 9 is shown, (a) is a front view, (b) is a side view, (c) is a perspective view. FIG. 9 shows details of the diagonal reinforcing member of the embodiment of FIG. 9, (a) is a rear view, (b) is a right side view of (a), (c) is a plan view, and (d) is a bottom view. 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 a detailed view of an oblique reinforcing member. A conventional example is shown, (a) is a front view, (b) is a perspective view of an oblique reinforcing member.

  An embodiment of the present invention will be described with reference to the drawings. The reinforcing structure around the through hole of the concrete beam according to this embodiment has a structure in which the periphery of the through hole 2 provided in the beam 1 (see, for example, FIG. 12) connecting the columns 4 and 4 is reinforced by the annular reinforcing member 10. In addition to the annular reinforcing member 10, an oblique reinforcing member 20 is disposed.

Each of the annular reinforcing member 10 and the oblique reinforcing member 20 intersects the initial shear crack when the initial shear crack generated when a shear stress acts on the beam 1 propagates around the through hole 2. It arrange | positions so that a predetermined member may be located in the direction.
That is, the annular reinforcing member 10 and the oblique reinforcing member 20 suppress the development of shear cracks due to the adhesive force with concrete.
Furthermore, since the diagonal reinforcement member 20 is locked and fixed to the upper and lower main bars 6 of the through-hole 2, the main bar 6 can be restrained and buckling can be suppressed. Further, since the displacement in the height direction of the beam is constrained, the destruction of the concrete can be suppressed and the deformation performance of the beam 1 can be improved.

  1 to 3 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-mentioned 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) (see FIG. 3). As shown in FIG. 3, each of the shear reinforcing members 10 is arranged 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.

  In addition, although the cyclic | annular reinforcement member 10 of this embodiment makes a steel material arbitrary shapes, well-known cyclic | annular reinforcement members 10 other than this embodiment can be used. For example, a string-like continuous fiber may be impregnated with an uncured resin and cured. As long as the shape surrounds the through hole 2, it may be a shaft-like member or a plate-like member, or may be a single member or a combination of a plurality of members.

  Moreover, as shown in FIGS. 4A to 4C and FIGS. 5A to 5D, the oblique reinforcing member 20 according to this embodiment has a single continuous reinforcing bar (axial 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, as in the case of the annular reinforcing member 10, a continuous fiber impregnated with an uncured resin and the resin cured may be used.

The diagonal reinforcement member 20 is provided with the latching | locking part 21 used as the latching location to the said main reinforcement 6 in the longitudinal direction center part of the said shaft-shaped member, as shown in FIGS. The locking portion 21 is composed of a bent portion 21a provided on the shaft-like member.
Further, a shear reinforcement portion 22 is provided that extends from the locking portion 21 to both sides in the beam axis direction of the through hole 2 and gradually approaches the center in the beam height direction. That is, in the diagonal reinforcing member 20 that is locked to the upper main bar 6, the shear reinforcing portion 22 extends downward, and in the diagonal reinforcing member 20 that is locked to the lower main bar 6, the shear reinforcing portion 22 extends upward.
In this embodiment, the shear reinforcement portion 22 is linear, but any shape that can counter the initial shear cracks may be used even with some curved portions and bent portions.

Further, the bent portion 21a is formed in an arc shape so as to connect between the shear reinforcement portions 22 on both sides, and the oblique reinforcing member 20 is in a state where the inwardly facing surface of the arc contacts the main muscle 6. It is locked to the main muscle 6. That is, as shown in FIG. 4B and FIG. 5B, the diagonal reinforcing member 20 has a U-shape as viewed from the side as a whole.
Further, as shown in FIGS. 4A and 5A, the angle formed between the shear reinforcement portions 22 and 22 is 60 degrees, and the oblique reinforcement member 20 is generally formed in a mountain shape that is isosceles in front view. It has become. In addition, this angle is not limited to 60 degrees, For example, you may set to other angles, such as 90 degrees.

  As shown in FIG. 1 and the like, when the locking portion 21 is locked to the main reinforcement 6, the shear reinforcement portion 22 reaches or exceeds the center in the height direction of the beam 1. It is desirable to have a length. That is, it is desirable that the ends of the respective shear reinforcement portions 22 of the upper and lower oblique reinforcement members 20 reach the center of the beam 1 in the height direction. In this way, when the beam 1 is viewed from the front, the periphery of the through-hole 2 is surely surrounded by the upper and lower diagonal reinforcing members 20, so that a high reinforcing effect can be expected.

  In this embodiment, the ends of the shear reinforcement portions 22 and 22 on both sides of the engaging portion 21 are bent to increase the degree of fixing to the surrounding concrete, and the retaining action portion 23 and It has become.

  Further, in this embodiment, the shaft-like member has the same diameter over the entire length, and the shear reinforcement portions 22 and 22 on both sides sandwiching the locking portion 21 are formed to have an equal weight and an equal length. Yes. For this reason, the balance between the shear reinforcement portions 22 on both sides of the locking portion 21 is good, which is effective in stabilizing the posture of the oblique reinforcement member 20, and the both sides of the through hole 2 in the beam axis direction. Can be evenly reinforced.

This construction method 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 diagonal reinforcing member 20 is inserted into the space surrounded by the ribs 7 from the gap between the ribs 7 and the ribs 7. At this time, the diagonal reinforcing member 20 that is locked to the main reinforcement 6 above the beam 1 is disposed so that the locking portion 21 is directly above the through hole 2, and the locking portion 21 is hooked on the main reinforcement 6. . Further, the diagonal reinforcing member 20 that is locked to the main reinforcement 6 below the beam 1 is arranged so that the locking portion 21 is directly below the through-hole 2, and the locking portion 21 is hooked on the main reinforcement 6.

In this embodiment, out of a plurality (four) of the main bars 6 arranged in parallel in the beam width direction, the two main bars 6 in the central part are the targets for locking the diagonal reinforcing member 20. This is because when the diagonal reinforcing member 20 is locked to the main reinforcement 6 on the outer side in the beam width direction, the distance from the annular reinforcing member 10 fixed to the rib 7 becomes close.
That is, since the diagonal reinforcing member 20 is the main bar 6 other than the main bar 6 located on the outer side in the beam width direction, the position of the diagonal reinforcing member 20 and the position of the annular reinforcing member 10 can be separated by a predetermined distance in the beam width direction. it can. For this reason, it is possible to prevent interference with the annular reinforcing member 10 when the oblique reinforcing member 20 is arranged and fixed.

Further, as shown in FIGS. 1 and 2, the lower main bar 6 for locking the diagonal reinforcing member 20 and the upper main bar 6 for locking the diagonal reinforcing member 20 are set to be shifted in the beam width direction. Yes. Thereby, when the said locking part 21 is locked and arrange | positioned at the main reinforcement 6, it can be set so that the front-end | tip of the shear reinforcement part 22 may reach or exceed the height direction center part of the beam 1. .
In this embodiment, as shown in FIG. 2, the tip of each shear reinforcement portion 22 is set to be located at the center in the height direction of the beam 1.

As described above, the through hole 2 is formed by the two diagonal reinforcing members 20, that is, the diagonal reinforcing member 20 that is locked to the main bar 6 above the beam 1 and the diagonal reinforcing member 20 that is locked to the main bar 6 below the beam 1. Since the surroundings can be enclosed, the arrangement is easy.
Further, these two oblique reinforcing members 20 can be inserted into a predetermined location through the gap between the streaks 7 and 7 separately. In addition, when inserting, the space | interval with the adjacent rib 7 may be expanded by shifting the rib 7 slightly.

Further, since each of the diagonal reinforcing members 20 is configured so that the shear reinforcement portion 22 extends on both sides in the beam axis direction with the locking portion 21 interposed therebetween, the shear reinforcement portion 22 is fixed by fixing the locking portion 21 to the main reinforcement 6. The direction of is inevitably determined. In particular, in the case of the diagonal reinforcing member 20 that is locked to the main bar 6 above the beam 1, the locking part 21 is locked to the main bar 6 so that the shear reinforcing part 22 is supported to hang down by its own weight. Therefore, even if an operator does not lift and change the direction separately, it is arranged in a predetermined direction. For this reason, arrangement | positioning and fixing work of the diagonal reinforcement member 20 become remarkably easy.
Of the diagonal reinforcing members 20 arranged above and below the through-hole 2, the diagonal reinforcing member 20 arranged later (for example, the diagonal reinforcing member 20 locked to the lower main reinforcement 6) is the diagonal reinforcing member arranged first. If the position of the tip of the member 20 (for example, the diagonal reinforcing member 20 locked to the upper main reinforcement 6) is used as a reference, it can be easily arranged vertically symmetrically. For this reason, it is easy to arrange the shear reinforcement portions 22 of the diagonal reinforcement members 20 evenly around the through holes 2.

  In addition, as shown in the modification of FIG.4 (d), the latching | locking part 21 of the diagonal reinforcement member 20 can be latched to the some main reinforcement 6 parallel in a beam width direction, for example, circular arc shape of a wide ellipse You may form in. Further, in order to facilitate the manufacture of the diagonal reinforcing member 20, it is desirable to increase the arc diameter.

  Furthermore, other embodiments are shown in FIGS. In this embodiment, as in the modification of FIG. 4 (d), it can be locked to a plurality of main bars 6 arranged in parallel in the beam width direction, and the configuration of the locking portion is bent at two locations. It is comprised by the part 21b, 21b and the linear part 21c between the bending parts 21b, 21b.

  That is, the locking portion 21 is composed of two bent portions 21b and 21b provided on the shaft-like member, and a straight portion 21c between the two bent portions 21b and 21b. The diagonal reinforcing member 20 is locked to the main bar 6 in a state where the inner facing surfaces of 21b and 21b are in contact with the corresponding main bar 6, respectively.

  Instead of or in addition to the inwardly facing surfaces of the bent portions 21b and 21b coming into contact with the corresponding main muscle 6, the diagonal reinforcing member 20 is in the state where the straight portion 21c is in contact with the main muscle 6. You may make it latch on.

  Other configurations and operations are the same as those of the above-described embodiment, and thus description thereof is omitted.

  In any of the embodiments, an oblique reinforcing member 20 formed of a plate-like member may be employed instead of the shaft-like member. In the case where a plate-like member is employed as the oblique reinforcing member 20, when the locking portion 21 is constituted by bent portions 21a, 21b, etc., the bend is bent so as to curve the plate surface of the flat plate-like member. If the bent portions 21a and 21b are processed, they can be easily manufactured.

  Still another embodiment is shown in FIGS. This embodiment is a reinforcing structure around a through hole of a concrete beam using an oblique reinforcing member 20 having two locking portions 21.

  As shown in FIG. 9, the structure includes a plurality of main bars 6 arranged in the beam 1 in the beam axis direction, and a stirrup 7 arranged around the plurality of main bars 6. The point etc. which are provided with the through-hole 2 extended in the beam width direction of the beam 1 and the cyclic | annular reinforcement member 10 surrounding the through-hole 2 are the same as that of the above-mentioned embodiment.

  An oblique reinforcing member 20 is locked to the main reinforcement 6 above the through hole 2. In this embodiment, as shown in FIG. 9, the diagonal reinforcing member 20 is disposed only above the through hole 2, but in addition to or instead of the diagonal reinforcing member 20 below the through hole 2. May be arranged.

  The diagonal reinforcing member 20 includes a pair of locking portions 21 and 21 that are locked to the main reinforcement 6 and are arranged in parallel in the beam axis direction. Each of the pair of locking portions 21 and 21 includes a bent portion 21a bent in an arc shape. The inner surfaces of the pair of bent portions 21 a, 21 a hit the main muscle 6, and the pair of locking portions 21, 21 are locked so as to be hooked in parallel to the main muscle 6. Note that the ends of the pair of bent portions 21a and 21a are extended portions 26 extending toward the center in the beam height direction.

  In addition, the diagonal reinforcing member 20 has a left side (one side) in the beam axis direction of the through hole 2 from a locking part 21 (one locking part 21) shown on the left side of the pair of locking parts 21 and 21. ) And gradually reaches the center in the beam height direction. Further, of the pair of locking portions 21 and 21, the locking portion 21 (the other locking portion 21) shown on the right side in the drawing extends to the right side (the other side) in the beam axis direction of the through hole (2). A second shear reinforcement (22b) is provided which gradually approaches the center in the beam height direction.

  Furthermore, the diagonal reinforcement member 20 is provided with the 1st auxiliary | assistant shear reinforcement part 24a arrange | positioned along said 1st shear reinforcement part 22a. The first auxiliary shear reinforcement portion 24a is connected to the first shear reinforcement portion 22a by a bent portion 25 provided at the end of the first shear reinforcement portion 22a on the center side in the beam height direction. The first auxiliary shear reinforcement portion 24a extends in parallel from the bent portion 25 to the first shear reinforcement portion 22a and reaches the top portion 27 near the pair of locking portions 21 and 21.

  Further, the diagonal reinforcing member 20 includes a second auxiliary shear reinforcing portion 24b disposed along the second shear reinforcing portion 22b. The second auxiliary shear reinforcement portion 24b is connected to the second shear reinforcement portion 22b by a bent portion 25 provided at the end of the second shear reinforcement portion 22b on the center side in the beam height direction. The second auxiliary shear reinforcement 24b extends in parallel from the bent portion 25 to the second shear reinforcement 22b and reaches the top 27 near the pair of locking portions 21 and 21.

  The first auxiliary shear reinforcement portion 24a and the second auxiliary shear reinforcement portion 24b are connected by the top portion 27, that is, via the first auxiliary shear reinforcement portion 24a and the second auxiliary shear reinforcement portion 24b. The first shear reinforcement portion 22a and the second shear reinforcement portion 22b are connected. As in this embodiment, the top 27 is preferably located at the center of the pair of locking portions 21 and 21 in the beam axis direction.

  Further, the diagonal reinforcing member 20 is formed symmetrically and with an equal weight with respect to the center in the beam axis direction of the pair of locking portions 21, 21, that is, the vicinity of the top portion 27. In this embodiment, the diagonal reinforcing member 20 is configured by bending a single continuous reinforcing bar (shaft-like member) as in the above-described embodiment.

  In this way, with the center of the pair of locking portions 21 and 21 in the beam axis direction, the first shear reinforcement portion 22a, the second shear reinforcement portion 22b, and the first auxiliary shear reinforcement are provided on both sides in the beam axis direction. Since the portion 24a and the second auxiliary shear reinforcement portion 24b are arranged, the first shear reinforcement portion 22a, the second shear reinforcement portion 22b and the like are secured by fixing the pair of locking portions 21 and 21 to the main muscle 6. The direction of is inevitably determined. In particular, in the case of the diagonal reinforcing member 20 that is locked to the main bar 6 above the beam 1, the pair of locking parts 21 and 21 are locked to the main bar 6, so that the first shear reinforcing part 22 a and the second Since the shear reinforcement portions 22b and the like are supported so as to hang down by their own weight, they are arranged in a predetermined direction without the operator having to lift and change the direction. For this reason, arrangement | positioning and fixing work of the diagonal reinforcement member 20 become remarkably easy. In this embodiment, since the diagonal reinforcing member 20 is formed symmetrically and with an equal weight with respect to the vicinity of the top 27, the effect is further high.

  Moreover, when arrange | positioning the diagonal reinforcement member 20 at the upper and lower sides of the through-hole 2, respectively, the diagonal reinforcement member 20 arrange | positioned later (for example, the diagonal reinforcement member 20 latched to the lower main reinforcement 6) was arrange | positioned previously. If the position of the tip of the diagonal reinforcing member 20 (for example, the diagonal reinforcing member 20 locked to the upper main reinforcement 6) (corresponding to the bent portion 25) is used as a reference, it can be easily arranged vertically symmetrically. For this reason, it is easy to arrange the shear reinforcement portions 22 of the diagonal reinforcement members 20 evenly around the through holes 2.

  As described above, when the diagonal reinforcing members 20 are arranged above and below the through-hole 2, the tips of the first shear reinforcing portion 22a and the second shear reinforcing portion 22b of the upper and lower diagonal reinforcing members 20, respectively, Since each beam 1 reaches the center in the height direction, the upper and lower diagonal reinforcing members 20 are arranged so as to surround the through hole 2 in a front view of the beam 1. This is the same as the above-described embodiments.

  Also in this embodiment, as in the above-described embodiments, the locking portion 21 of the diagonal reinforcing member 20 can be locked to a plurality of main bars 6 arranged in parallel in the beam width direction, for example, FIG. As shown in FIG. 7 and FIG. 8, two bent portions 21b and 21b and the bent portions 21b and 21b may be formed. It is good also as a structure provided with the linear part 21c in between.

In this embodiment, the first shear reinforcement 22a and the second shear reinforcement 22b are connected via the first auxiliary shear reinforcement 24a and the second auxiliary shear reinforcement 24b. Although the first shear reinforcement portion 22a and the second shear reinforcement portion 22b are connected to each other, for example, in the middle of the length direction of the first shear reinforcement portion 22a, the second shear reinforcement portion 22b is connected to the second shear reinforcement portion 22b. Another member for connecting the middle portion in the length direction of the shear reinforcement portion 22b in the beam axis direction may be provided.
This other member can be provided at a position where the through hole 2 is not hindered. In this case, a configuration in which the first auxiliary shear reinforcement portion 24a and the second auxiliary shear reinforcement portion 24b are not connected by the top portion 27 can be employed.

  In this embodiment, the first auxiliary shear reinforcement portion 24a and the second auxiliary shear reinforcement portion 24b are provided at the tips of the first shear reinforcement portion 22a and the second shear reinforcement portion 22b, respectively. In this configuration, the first auxiliary shear reinforcement 24a and the first shear reinforcement 22a are connected, and the second auxiliary shear reinforcement 24b and the second shear are connected. The connection with the reinforcing portion 22b is not limited to this embodiment. For example, the middle in the length direction of the first auxiliary shear reinforcing portion 24a and the middle in the length direction of the first shear reinforcing portion 22a. Another member that connects the second auxiliary shear reinforcement portion 24b in the middle of the length direction and the middle of the second shear reinforcement portion 22b in the length direction may be provided. .

  Further, for example, in the configuration shown in FIGS. 1 to 8, the first auxiliary shear reinforcing portion 24a and the second auxiliary shear reinforcing portion 24b are respectively provided to the shear reinforcing portions 22 and 22 on both sides in the beam axis direction. A member corresponding to may be provided.

1 Beam (concrete beam)
2 Through hole 3 Piping 4 Column 6 Main bar 7 Stirrup (shear reinforcement)
DESCRIPTION OF SYMBOLS 10 Cylindrical reinforcement member 11,20 Diagonal reinforcement member 11a Hook part 11b Straight bar part (shear reinforcement part)
11c connecting part 11d retaining part 20 oblique reinforcing member 21 locking part 21a, 21b bent part 21c straight part 22 shear reinforcing part 22a first shear reinforcing part 22b second shear reinforcing part 23 retaining part 24a first Auxiliary shear reinforcement portion 24b second auxiliary shear reinforcement portion 25 bent portion 26 extension portion 27 top portion

Claims (5)

A plurality of main bars (6) arranged in the beam axis direction of the beam (1), a stirrup (7) arranged around the plurality of main bars (6), A through hole (2) extending in the beam width direction of the beam (1), and an annular reinforcing member (10) surrounding the through hole (2),
The diagonal reinforcing member (20) is engaged with the main reinforcement (6) above or below the through hole (2), and the diagonal reinforcing member (20) is composed of one continuous shaft-shaped member, A locking portion (21) locked to the main reinforcement (6), and extends from the locking portion (21) to both sides in the beam axis direction of the through hole (2), and gradually approaches the center in the beam height direction. A shear reinforcement portion (22), and the diagonal reinforcement member (20) is arranged in order along the beam axis direction, the shear reinforcement portion (22) on either side of the beam width direction with the main reinforcement (6) interposed therebetween, The locking portion (21) and the shear reinforcement portion (22) on the opposite side of either side are arranged to form a mountain shape in the front view of the beam (1), and the diagonal reinforcement member (20 ) From above to below the beam (1) or from below to above Reinforcing structure of the through hole surrounding Concrete beam, wherein can der Rukoto be locked the locking portion (21) to the main reinforcement (6).   2. The concrete beam according to claim 1, wherein the diagonal reinforcing member (20) is formed symmetrically and with an equal weight between members on both sides of the locking portion (21). Reinforcement structure around the through hole.   The diagonal reinforcing members (20) are respectively arranged above and below the through-hole (2), and the ends of the shear reinforcing portions (22) of the upper and lower diagonal reinforcing members (20) are respectively high in the beam (1). The upper and lower diagonal reinforcing members (20) are arranged so as to surround the through hole (2) when viewed from the front of the beam (1). Item 3. A reinforcing structure around a through hole of a concrete beam according to item 1 or 2. A plurality of main bars (6) arranged in the beam axis direction of the beam (1), a stirrup (7) arranged around the plurality of main bars (6), A through hole (2) extending in the beam width direction of the beam (1), and an annular reinforcing member (10) surrounding the through hole (2),
An oblique reinforcing member (20) locked to the main bar (6) above or below the through hole (2) is provided, and the diagonal reinforcing member (20) is locked to the main bar (6) and is supported by a beam axis. The pair of locking portions (21, 21) parallel to the direction and the beam height direction gradually extending from one of the pair of locking portions (21, 21) to one side of the through hole (2) in the beam axis direction A first shear reinforcement portion (22a) approaching the center and the other of the pair of locking portions (21, 21) extend from the other side in the beam axis direction of the through hole (2) and gradually toward the center in the beam height direction. A second shear reinforcement (22b) approaching,
The diagonal reinforcing member (20) is disposed along the first shear reinforcing portion (22a) and connected to the first shear reinforcing portion (22a), and a first auxiliary shear reinforcing portion (24a), A second auxiliary shear reinforcement (24b) disposed along the second shear reinforcement (22b) and connected to the second shear reinforcement (22b), the first shear reinforcement (22a) and said second shearing reinforcement portion and (22b), said first auxiliary shearing reinforcement portion (24a) and said second auxiliary shearing reinforcement portion concrete that are connected via a (24b) Zohari Reinforcement structure around the through-holes.   The diagonal reinforcing members (20) are respectively arranged above and below the through hole (2), and the first shear reinforcing portion (22a) and the second shear reinforcing portion (22b) of the upper and lower diagonal reinforcing members (20). ) To reach the center of the beam (1) in the height direction, and when viewed from the front of the beam (1), the upper and lower diagonal reinforcing members (20) extend around the through hole (2). The reinforcing structure around the through hole of the concrete beam according to claim 4, wherein the reinforcing structure is disposed so as to surround.

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