JP5528793B2 - Beam through-hole reinforcing device and beam structure - Google Patents

Description

  The present invention makes it possible to easily form a cover serving as a fireproof coating while securing reinforcement around the beam through-holes by using a steel material. It is possible to achieve good construction workability, high-quality joining performance, and improved versatility as parts, as well as buckling prevention performance of beam main bars and concrete collapse prevention performance above and below the beam through hole The present invention relates to a beam through-hole reinforcing device and a beam structure that can be improved.

  In a reinforced concrete or steel reinforced concrete beam, a beam through hole is formed in the beam width direction in order to arrange piping and the like. For example, Patent Documents 1 to 3 are known as techniques for reinforcing the beam through-holes and the periphery thereof.

  Patent Document 1 “Reinforcement Structure around Openings in Reinforced Concrete Beams” includes a plurality of diagonal bars around openings formed in reinforced concrete beams with upper and lower main bars and shear reinforcement bars. In the case of bar arrangement, two diagonal bars are used as a set, and the bars are arranged by crossing each other. Hooks are formed at both ends of the oblique line, and one hook is engaged with the upper main bar and the other hook is engaged with the lower main bar. A set of diagonal stripes is arranged on both sides of a vertical plane including the center on the vertical section perpendicular to the beam axis, and one side of the vertical plane is arranged on both sides with an opening. In addition, ring bars and vertical bars are arranged on the outer periphery of the opening.

  The “through-hole reinforcing metal for a concrete structure” of Patent Document 2 includes a hollow cylindrical body made of a corrosion-resistant metal sleeve made of stainless steel and a reinforcing bar welded to the outside. The reinforcing bars are rods radially arranged outwardly in the radial direction on the outer peripheral surface of the corrosion-resistant metal sleeve, and an annular loop extending between the rod bars along the circumferential direction of the corrosion-resistant metal sleeve. It is comprised from the stripe | line | muscle and the horizontal stripe | line which these are arranged in parallel along the axial direction, and connect and connect between these.

  Patent Document 3 “Reinforcement Structure, Reinforcement Method, Beam Structure of Reinforced Concrete Beam with Opening” is a reinforcement structure of a reinforced concrete beam having an opening, a steel pipe is inserted inside the opening, and a shear reinforcing bar of the reinforced concrete beam is a steel pipe. It is set as the structure joined to the outer peripheral surface.

JP 2006-183111 A JP-A-7-62793 JP 2007-51533 A

  In Patent Document 1, since the ring bars are only provided on both ends of the opening, the concrete above and below the opening located between the ring bars may be destroyed at an early stage. In addition, with regard to the vertical and diagonal bars involved in buckling reinforcement, the ends of the linear reinforcing bars are only locked to the ring bars and beam main bars at both ends of the opening. Sometimes the large compressive force (buckling force) acting on the beam main bars cannot be fully borne.

  In addition, linear diagonal bars are attached to the ring bars and beam main bars in the diagonal direction with their both ends locked to the ring bars and beam main bars, respectively, but are affected by the dimensional errors and construction errors of these various reinforcing bars. Each oblique line cannot be arranged at a predetermined inclination angle as designed, and there is a possibility that satisfactory reinforcement performance may not be obtained or performance may vary. In particular, in bending deformation of a beam, it is necessary to exert the same performance for both positive and negative bending moments due to the structure, and a pair of upper and lower diagonal bars must be arranged at the same angle. However, it was difficult to obtain reliable reinforcement performance due to the above construction error and the like.

  Even if stress transmission is assured by the anchor bars, the workability of the bar arrangement deteriorates, and the bar arrangement becomes overcrowded, and there is a concern about the filling property of the concrete. Furthermore, since the stirrup bars are wound around the beam main bars on both sides of the opening, it is difficult to lock the ends of the diagonal bars to the beam main bars on the outermost side in the beam width direction. There was a problem in both workability and reinforcement performance, because the bars and the like had to be arranged inward in the beam width direction rather than the stirrup bars.

  In Patent Document 2, since the rod reinforcement is butt welded to the sleeve, the joint strength is weak, and the beam main reinforcement is broken by the deformation of the sleeve accompanying the bending deformation of the beam and the force from the beam main reinforcement. There was a possibility that the buckling of the material could not be prevented.

  In Patent Document 3, since the shear reinforcement is in-situ welding at a position surrounded by other beam reinforcing bars, and because there are some upward welds, the welding operation is complicated and the welding quality is low. There was a problem that it was difficult to secure.

  In both Patent Documents 2 and 3, since the sleeve and the like are joined to the reinforcing bar and the shear reinforcing bar by welding, the specifications of the sleeve and the reinforcing bar have various beam sizes and various hole diameters. There is a problem that the versatility is poor because it is necessary to individually determine and prepare for each beam through hole. Considering sleeves and reinforcing bars as individual parts, versatility was necessary.

  Specifically, since a sleeve or the like also serves as a formwork material for the beam through hole, it is necessary to prepare a plurality of sleeves for each inner diameter of the beam through hole to be formed. Since the beam width is innumerable, in order to cut out a sleeve or the like according to the beam width, a long tube material must be secured in advance in a vast storage space such as a factory. As for the rebars to be joined to the sleeve, etc., the length of the beam through hole is different in the beam direction, and the position of the beam through hole is variously set. It was necessary to prepare various things.

  From the viewpoint of installation workability inside the beam formwork, such as a sleeve, the sleeve of Patent Document 2 is pre-joined with various rebars, and the whole is incorporated into the beam rebar set, and then the beam main bars and shears. Since it has to be joined to various beam reinforcing bars such as reinforcing bars, the reinforcing bar on the sleeve side and the beam reinforcing bar set are complicated and complicated, and the work is complicated and not efficient. It is possible to treat the sleeve as a single unit, and after installing the sleeve, it is possible to join the reinforcing bar to both the sleeve and the beam reinforcing bar set. The installation work was complicated. In the case of a beam in which a plurality of beam through holes are formed, the complexity and inefficiency of construction efficiency become even more remarkable.

  Moreover, in either of Patent Documents 2 and 3, when a reinforcing bar or shear reinforcing bar is joined in advance to a sleeve or the like and then brought into the beam reinforcing bar set, the steel pipe to which the reinforcing bar is attached is heavy. Heavy equipment was required, the construction cost increased, and the workability was not good.

  The sleeve of Patent Document 2 and the steel pipe of Patent Document 3 are originally installed inside a beam formwork and are also used as a formwork material for forming a beam through hole. Accordingly, the sleeve or the like is installed so as to cross the beam in the beam width direction. At the time of beam construction, concrete is placed around these sleeves and the like. However, it is difficult for concrete to enter the lower part of the sleeve and the like on the bottom side of the beam, so that poor filling tends to occur. If voids occur due to poor filling, the strength performance around the beam through-holes may be adversely affected. In particular, in Patent Document 2, since a large number of reinforcing bars are densely provided around the sleeve, there is a further concern about the filling property of the concrete around the beam through hole.

  In the case of a refractory building, in Patent Document 3, since the steel pipe is exposed on the inner surface of the beam through-hole, it is necessary to provide a cover as a refractory coating separately, which increases the construction process and increases the cost. End up. In order to form the covering, for example, after removing the beam formwork, a formwork material for forming a beam through-hole is separately installed inside the steel pipe, and concrete or grout is placed between the formwork material and the steel pipe. Filling to form a fireproof coating, but this increases the number of work steps and increases the cost. On the other hand, the use of fire-resistant steel for the steel pipe or the use of a stainless steel corrosion-resistant metal sleeve as in Patent Document 2 eliminates the need for fire-resistant coating, but this type of material is more expensive than general steel materials. This increases the cost.

  The present invention was devised in view of the above-described conventional problems, and it is possible to easily form a cover that becomes a fireproof coating while securing reinforcement around the beam through hole with a steel material, and through the beam. It is possible to achieve concrete filling performance around the hole, good construction workability to the beam rebar assembly, high-quality joining performance, and improved versatility as parts. An object of the present invention is to provide a beam through-hole reinforcing device and a beam structure capable of improving the crush prevention performance of concrete positioned above and below the beam through-hole.

A beam through-hole reinforcing device according to the present invention is a reinforcing device that reinforces a beam through-hole formed in the beam width direction between upper and lower beam main reinforcing bars, and includes a plurality of circular ring-shaped reinforcing bars on both sides in the beam width direction. It is formed in a nearly hollow cylindrical shape by being arranged side by side in the beam width direction across the surface side, and has a plurality of gaps through which concrete flows between these ring-shaped reinforcing bars and has an inner edge that is inclined in the vertical direction. A steel annular reinforcing member for surrounding the cylindrical formwork forming the beam through-hole with a covering thickness, and a slide slidably locked to the obliquely inner edge of the annular reinforcing member An annular buckling restraining bar having a locking inner edge and a beam side locking inner edge for locking to at least one of the upper and lower beam main bars, respectively, and the axial center of the annular reinforcing member and the formwork are aligned with each other characterized in that was.

  The beam structure according to the present invention is constructed by incorporating the beam through-hole reinforcing device into a beam reinforcing bar set of a beam made of reinforced concrete or steel reinforced concrete.

In the beam through-hole reinforcing device and the beam structure according to the present invention, it is possible to easily form a cover serving as a fireproof coating while securing reinforcement around the beam through-hole with a steel material, and to the periphery of the beam through-hole. The concrete fillability, good workability to the beam rebar assembly, high quality joining performance, and improved versatility as a part can be achieved. The crushing prevention performance of the located concrete can also be improved. Specifically, since the axial center of the substantially hollow cylindrical annular reinforcing member formed of a plurality of circular ring-shaped reinforcing bars and the cylindrical formwork coincide with each other, a uniform covering thickness is provided inside the annular reinforcing member. A fireproof coating with concrete can be formed. And an annular reinforcing member that is formed from a plurality of ring-shaped reinforcing bars arranged side by side in the beam width direction with respect to the fireproof covering with concrete having a uniform covering thickness, and extends between both side surfaces of the beam in the beam width direction, The concrete above and below the beam through hole can be constrained by the confining effect of the buckling restraint bars provided on the annular reinforcing member and the upper and lower beam main bars.

It is a perspective view showing one suitable embodiment of a beam penetration hole reinforcement device concerning the present invention. It is a perspective view which shows the state which incorporated the beam through-hole reinforcement apparatus of FIG. 1 in the beam. It is the schematic which shows the other example of the buckling restraint muscle applicable to the beam through-hole reinforcement apparatus which concerns on this invention. It is explanatory drawing explaining the absorption effect | action of the error by the buckling restraint bar and the cyclic | annular reinforcement member of the beam through-hole reinforcement apparatus which concerns on this invention. It is explanatory drawing explaining the versatility with respect to the beam seismic obtained by the buckling restraint bar and the annular reinforcement member of the beam through-hole reinforcement apparatus which concerns on this invention. It is the schematic which shows the modification of the beam through-hole reinforcement apparatus which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a beam through-hole reinforcing device and a beam structure according to the present invention will be described in detail with reference to the accompanying drawings. As shown in FIGS. 1 to 5, the beam through-hole reinforcing device 1 according to the present embodiment mainly includes a beam penetration formed between the upper and lower beam main reinforcing bars 3 and 4 of a reinforced concrete beam 2 or a steel reinforced concrete beam in the beam width direction. An annular reinforcing member 6 that reinforces the hole 5 and a buckling restraint 7 that bears the compressive force generated in the beam main bars 3 and 4 in order to suppress buckling of the upper and lower beam main bars 3 and 4. Is done. The beam through-hole reinforcing device 1 according to this embodiment may be installed at the end of the beam 2 or may be installed at the center of the beam 2.

The annular reinforcing member 6 is composed of a set of a plurality of ring-shaped reinforcing bars 8. The annular reinforcing member 6 has a substantially hollow cylindrical shape with a gap Y formed between the ring-shaped reinforcing bars 8 by arranging the ring-shaped reinforcing bars 8 side by side in the beam width direction. In the present embodiment, the annular reinforcing member 6 is configured to extend between both side surfaces in the beam width direction by the arrangement of the plurality of ring-shaped reinforcing bars 8. In the illustrated example, each ring-shaped reinforcing bar 8 is circular, but may be polygonal.

  In the ring-shaped reinforcing bar 8, an inner edge 8 a that is inclined in the vertical direction is set corresponding to the upper position and the lower position of the annular reinforcing member 6 facing the upper and lower beam main bars 3 and 4. In the case of the circular ring-shaped reinforcing bar 8, the inner edge portion of the arc-shaped portion that descends obliquely from side to side from the top of the circle becomes the oblique inner edge portion 8 a. In the case of a polygonal ring-shaped reinforcing bar, the inner edge portion of the side portion that diagonally descends from one corner to the left and right is the oblique inner edge portion. It suffices if the inner edge 8a is formed obliquely on the inner peripheral side of the ring-shaped reinforcing bar 8, and the form on the outer peripheral side is not limited.

  In the annular reinforcing member 6, a gap Y is formed between the adjacent ring-shaped reinforcing bars 8. In the illustrated example, a plurality of gaps Y are formed, and these gaps Y serve as a circulation portion for circulating the concrete C into and out of the annular reinforcing member 6. The dimension of each gap Y in the beam width direction may be set appropriately in consideration of the flowability of the concrete C.

A cylindrical form 9 for forming the beam through-hole 5 is installed inside the annular reinforcing member 6 constituted by the arrangement of the ring-shaped reinforcing bars 8 at the time of construction. The annular reinforcing member 6, i.e., the ring-shaped reinforcing bar 8, is formed with an inner diameter dimension that surrounds the mold 9 with a covering thickness that becomes a fireproof coating. When the axial centers of the annular reinforcing member 6 and the formwork 9 coincide with each other, a refractory coating of concrete C is formed with a uniform covering thickness inside the ring-shaped reinforcing bar 8 and thus inside the annular reinforcing member 6. When the shaft centers do not coincide with each other in the vertical direction or the horizontal direction, a necessary covering thickness is secured at a minimum gap portion between the ring-shaped reinforcing bar 8 and the mold 9 and a fireproof coating is formed.

  The annular reinforcing member 6 is provided with at least two annular buckling restraint bars (rebars) 7 corresponding to the upper and lower beam main bars 3 and 4, respectively. The ring-shaped reinforcing bar 8 and the buckling restraint bar 7 of the annular reinforcing member 6 have a structure in which a ring is connected to each other, and are assembled so that the other can be turned along one circumferential direction. In the illustrated example, four buckling restraint bars 7 are assembled on the annular reinforcing member 6, two for each of the upper and lower beam main bars 3, 4. May be attached.

  The buckling restraint bars 7 connect the annular reinforcing members 6 to the upper and lower beam main bars 3 and 4, and are arranged at the upper and lower positions of the annular reinforcing member 6 facing the upper and lower beam main bars 3 and 4. Is done. The buckling restraint muscles 7 are arranged so as to be distributed between the upper and lower central positions in the case of one upper and lower one, and in the case of two upper and lower positions, with the central position being sandwiched therebetween. The buckling restraint bar 7 is formed so that the upper and lower inner edge portions locked to the annular reinforcing member 6 and the upper and lower beam main bars 3 and 4 are formed as a slide locking inner edge 7a and a beam side locking inner edge 7b in the horizontal direction. Is done.

  The slide locking inner edge 7a is disposed on the oblique inner edge portion 8a of the ring-shaped reinforcing bar 8 (annular reinforcing member 6), and is slidably locked along the oblique inner edge portion 8a. The beam-side locking inner edge 7 b is locked from above the upper beam main bar 3 and from below the lower beam main bar 4, and connects the beam upper and lower main bars 3, 4 to the annular reinforcing member 6. It is supposed to be. The slide locking inner edge 7a locked to the annular reinforcing member 6 and the beam side locking inner edge 7b locked to the upper and lower beam main bars 3 and 4 are arranged to face each other in the vertical direction. , 4, the annular reinforcing member 6 and the upper and lower beam main bars 3 and 4 are connected by a buckling restraint bar 7 which is vertically oriented. The form of the vertical part which connects an upper part and a lower part is not ask | required.

  In the illustrated example, a rectangular buckling restraint 7 is shown. The buckling restraint bar 7 is formed in an annular shape by bending a single reinforcing bar into a rectangular shape and connecting the connecting terminals with a coupler 10 of a screw type or a wedge type. In addition to this, as shown in FIG. 3, the annular form of the buckling restraint bar 7 is a U-shaped first reinforcing bar 11 that forms three sides of a rectangular shape, and a straight second reinforcing bar that forms the other side. The twelve connection terminals can be connected to each other at two locations by the coupler 10 or can be formed in various other modes.

  The buckling restraint bar 7 is detached from the coupler 10 and the connection terminal is opened, so that the ring-shaped reinforcing bar 8 is assembled to the inside thereof. As for the assembling of the beam main bars 3 and 4 to the buckling restraint 7, it may be assembled with the connecting terminal removed or inserted into the buckling restraint 7 having an annular shape and assembled. good.

  In the illustrated example, the buckling restraint bar 7 locks all the ring-shaped reinforcing bars 8 and all the beam main bars 3 and 4 in the beam width direction. However, a plurality of sets of annular reinforcing members 6 and buckling restraint bars 7 composed of a plurality of ring-shaped reinforcing bars 8, that is, a single beam through-hole reinforcing device 1 may be arranged in the beam width direction. In other words, when the beam width is long, the ring-shaped reinforcing bars 8 and the main beam bars 3 and 4 may be locked by distributing to a plurality of buckling restraint bars 7 arranged side by side in the beam width direction. . Further, the buckling restraint bars 7 may not be locked to some of the beam main bars 3 and 4.

  In the case where a plurality of buckling restraint bars 7 are arranged above and below the annular reinforcing member 6, it is preferable that the buckling restraint bars 7 be arranged at an interval narrower than the interval between the stirrup muscles 13 of the beam 2. The buckling suppressing effect of the beam main bars 3 and 4 can be improved.

  The beam through-hole reinforcing device 1 configured as described above is inserted into a beam form for constructing a reinforced concrete beam 2 or a steel reinforced concrete beam, and a buckling restraint bar 7 is an upper and lower beam main bar 3 of the beam reinforcing bar set. The mold 9 for forming the beam through-hole 5 is placed inside the annular reinforcing member 6 and is embedded in the concrete C placed in the beam mold in this state. To constitute the beam structure.

  Next, the operation of the beam through-hole reinforcing device and the beam structure according to the present embodiment will be described. The beam through-hole reinforcing device 1 is installed in a beam form frame provided with a beam reinforcing bar set including upper and lower beam main bars 3 and 4. When installing, there is a first method in which the buckling restraint bar 7 is first attached to the annular reinforcing member 6 and a second method in which the buckling restraint bar 7 is first attached to the upper and lower beam main bars 3 and 4. .

  In the first method, the beam through-hole reinforcing device 1 in which the coupler 10 of the buckling restraint bar 7 that locks the annular reinforcing member 6 is disconnected is surrounded by the upper and lower beam main bars 3 and 4 and the stirrup bar 13. Then, the buckling restraint bar 7 is locked to the upper and lower beam main bars 3 and 4, and then the buckling restraint bar 7 is closed by the coupler 10. Alternatively, the beam through-hole reinforcing device 1 in which the coupler 10 of the buckling restraint 7 that locks the annular reinforcing member 6 is connected is installed at a predetermined position, and the upper and lower beam main bars 3 and 4 are inserted into the buckling restraint 7. To do.

  In the second method, the buckling restraint bar 7 in which the coupler 10 is not connected is locked to the beam upper and lower main bars 3 and 4 in advance, and the annular reinforcing member 6 composed of a plurality of ring-shaped reinforcing bars 8 is connected to the upper and lower beam main bars. It is inserted into a space surrounded by 3 and 4 and the stirrup muscle 13 and locked to the buckling restraint muscle 7, and then the buckling restraint muscle 7 is closed by the coupler 10.

  Thus, when the setting of the beam through-hole reinforcing device 1 is completed, the mold 9 for forming the beam through-hole 5 is placed inside the annular reinforcing member 6. Thereby, the beam through-hole reinforcing device 1 is completed and the installation in the beam form is completed.

  The beam through-hole reinforcing device 1 according to the present embodiment mainly has an extremely simple configuration including only an annular reinforcing member 6 and an annular buckling restraint 7 that is locked to the annular reinforcing member 6 and the upper and lower beam main bars 3 and 4. Therefore, the installation can be performed easily by simply inserting it into the space surrounded by the upper and lower beam main bars 3 and 4 and the stirrup bar 13. Further, the buckling restraint muscle 7 is arranged in the vertical direction so as not to interfere with the stirrup muscle 13 and is locked to the upper and lower beam main bars 3 and 4. It is only arranged in the beam width direction, which is a space, while being locked, and the connecting portion is only the coupler 10, and the assembling operation can be performed very simply.

  At this time, since the slide locking inner edge 7a of the buckling restraint 7 is slidable with respect to the obliquely oriented inner edge 8a of the ring-shaped reinforcing bar 8 (annular reinforcing member 6), as shown in FIG. Even if a dimensional error (L1 to L2) occurs between the annular reinforcing member 6 and the beam main bars 3 and 4 due to an error in construction or an error in construction, the inner edge of the annular reinforcing member 6 is inclined in the vertical direction. By sliding the sliding engagement inner edge 7a of the buckling restraint muscle 7 along 8a, the error can be absorbed and the beam through-hole reinforcing device 1 can be assembled appropriately.

  In addition, as shown in FIG. 5, this action is oblique even when the beam is high (simply indicated by L3 in the drawing) or low beam (simply indicated by L4 in the drawing). By sliding the slide locking inner edge 7a within the formation range of the facing inner edge portion 8a, the same beam through-hole reinforcing device 1 can be used regardless of the beam, and as a part of the annular reinforcing member 6 and the buckling restraint 7 The versatility of can be improved.

  Further, since the annular reinforcing member 6 does not serve as the mold 9 of the beam through-hole 5, if a member having a general-purpose diameter is prepared, it can be used to reinforce the beam through-hole 5 having various hole diameters. . Furthermore, the beam width direction dimension of the annular reinforcing member 6 can be adjusted with good versatility simply by increasing or decreasing the number of the ring-shaped reinforcing bars 8.

  In addition, unlike the welded joint, the locking structure can ensure a uniform reinforcing structure. Moreover, the beam through-hole reinforcement apparatus 1 can be comprised with all the reinforcing bars 7 and 8, and it is lightweight compared with the case where a steel pipe etc. are used, and it can construct it easily by human power.

  After the beam through hole reinforcing device 1 is installed, when the beam form is completed, concrete C is placed in the beam form from above the beam through hole reinforcing device 1. The concrete C is filled around the annular reinforcing member 6 and flows from the gap Y into and out of the annular reinforcing member 6. The concrete C that flows into the annular reinforcing member 6 forms a cover serving as a fireproof coating between the mold 9 and the annular reinforcing member 6. Thus, the covering can be formed at once by placing the concrete C in the beam formwork.

  In particular, the concrete C that flows downward from the gap Y of the annular reinforcing member 6 sufficiently spreads under the shadow of the mold 9 as seen from above, thereby preventing the generation of voids and preventing the annular reinforcing member 6. The surrounding concrete filling property can also be improved.

  The concrete C to be placed in the beam form is also filled around the beam reinforcing bar assembly, whereby the beam 2 made of reinforced concrete can be constructed. After the beam 2 is completed, the formwork is removed to form the beam through hole 5.

  In the beam structure constructed in this way, the annular reinforcing member 6 can resist the shearing force and reinforce the beam through-hole 5, and the shear strength can be enhanced. Further, a confined structure comprising an annular reinforcing member 6 having a length dimension between both side surfaces of the beam 2 in the beam width direction, a buckling restraint bar 7 provided on the annular reinforcing member 6, and upper and lower beam main bars 3 and 4. Due to the effect, the concrete C above and below the beam through-hole 5 can be constrained, and the buckling constraining bar 7 counteracts the annular reinforcing member 6 so that the compression-side beam main bars 3 and 4 are also buckled. Since it can suppress effectively, it can improve the toughness of the beam 2 regardless of the beam end portion or the beam center portion, and appropriately prevent the beam 2 from being brittlely broken.

As described above, the beam through-hole reinforcing device 1 according to the present invention is substantially hollow by arranging a plurality of circular ring-shaped reinforcing bars 8 side by side in the beam width direction between both side surfaces in the beam width direction. A cylindrical formwork that is formed in a cylindrical shape and has a plurality of gaps Y through which the concrete C flows between the ring-shaped reinforcing bars 8 and has an inner edge 8a that is inclined in the vertical direction , and forms the beam through hole 5. Steel annular reinforcing member 6 for enclosing 9 with a covering thickness, a slide locking inner edge 7a slidably locked to an obliquely oriented inner edge portion 8a of the annular reinforcing member 6, and at least one of upper and lower beams An annular buckling restraining bar 7 having beam-side locking inner edges 7b for locking to the main bars 3 and 4, respectively , and the annular reinforcing member 6 and the axis of the mold 9 are made to coincide with each other. Reinforced beam through-hole reinforcement device 1 made of reinforced concrete Since the beam structure is constructed by incorporating the steel reinforced concrete beam 2 into the beam reinforcing bar set, it becomes a fireproof coating while securing reinforcement around the beam through-hole 5 by cheaper reinforcing steel than stainless steel etc. Covering can be easily formed, and concrete C filling around the beam through-hole 5, flexibility of installation, prevention of complication of bar arrangement work, and good construction on beam rebar assembly obtained by weight reduction Workability, high-quality joint performance, improved versatility as parts, buckling prevention performance of beam main bars 3 and 4, and collapse prevention performance of concrete C positioned above and below beam through hole 5 Can also be improved.

  FIG. 6 shows a modification of the above embodiment. The annular reinforcing member 6 may be configured by a spiral reinforcing bar 14 having a form in which a plurality of ring-shaped reinforcing bars 8 are continuously arranged instead of arranging the plurality of ring-shaped reinforcing bars 8 in an array. In this case, the buckling restraint muscle 7 may be completely closed by welding or the like, and may be inserted and assembled from one end of the spiral muscle 14 to the other end.

  According to such a modification, it is not necessary to perform the connection work by the coupler 10, and the workability can be further improved. Even in such a modification, it is needless to say that the same effects as those of the above-described embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Beam through-hole reinforcement apparatus 2 Beam 3, 4 Vertical beam main reinforcement 5 Beam through-hole 6 Steel annular reinforcement member 7 Annular buckling restraint 7a Slide locking inner edge 7b Beam side locking inner edge 8a Vertically inclined inner edge 9 Type Frame 13 Stirrup Reinforcement C Concrete Y Clearance

Claims (2)

A reinforcing device for reinforcing a beam through hole formed in the beam width direction between upper and lower beam main bars,
A plurality of circular ring-shaped rebars are arranged side by side in the beam width direction across both side surfaces in the beam width direction to form a substantially hollow cylinder, and the concrete flows between these ring-shaped rebars. A steel annular reinforcing member for surrounding a cylindrical formwork having a plurality of gaps and an obliquely-inclined inner edge portion and forming the beam through hole with a covering thickness therebetween,
An annular buckling restraint having a slide locking inner edge that is slidably locked to the obliquely inner edge of the annular reinforcing member, and a beam side locking inner edge for locking to at least one of the upper and lower beam main bars, respectively. With muscles ,
A beam through-hole reinforcing device, wherein the annular reinforcing member and the axis of the mold are aligned .   A beam structure comprising the beam through-hole reinforcing device according to claim 1 incorporated in a beam reinforcing bar set of a beam made of reinforced concrete or steel reinforced concrete.

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