JP5528792B2 - 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 installation workability, high-quality joining performance, and improved versatility as a part, and the same as before, preventing the buckling of the beam main bars and crushing the concrete located above and below the beam through hole The present invention relates to a beam through-hole reinforcing device and a beam structure that can also achieve prevention.

  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 Literature 1 and Patent Literature 2 are known as techniques for reinforcing the beam through-holes and the periphery thereof.

  The “through-hole reinforcing metal for a concrete structure” of Patent Document 1 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 2 “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-A-7-62793 JP 2007-51533 A

  In the case of a fireproof building, in Patent Document 2, since the steel pipe is exposed on the inner surface of the beam through hole, it is necessary to provide a cover as a fireproof coating, 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 1 eliminates the need for fire-resistant coating, but this type of material is more expensive than general steel materials. This increases the cost.

  The sleeve of Patent Literature 1 and the steel pipe of Patent Literature 2 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 1, 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.

  From the standpoint of installation workability inside the beam formwork such as a sleeve, the sleeve of Patent Document 1 is pre-joined with various reinforcing bars, and the whole is incorporated into the beam reinforcing bar set, and then the beam main bars and shears are assembled. Since it has to be joined to various beam reinforcing bars such as reinforcing bars, the reinforcing bars on the sleeve side and various beam reinforcing bars 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 rebar to both the sleeve and the beam rebar 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.

  Furthermore, in either of Patent Documents 1 and 2, a sleeve or the like and a reinforcing bar or a shear reinforcing bar are joined by welding. For this reason, it is necessary to individually determine and prepare the specifications of the sleeves and the reinforcing bars according to various beam faults and beam through holes of various hole diameters, and there is a problem that the versatility is poor. 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.

  Even in actual joining work, if it is welded, depending on the processing accuracy of the sleeve, steel pipe, rebar, and shear reinforcement, the reinforcement joined to the sleeve cannot be joined to various beam reinforcements, or the shear reinforcement cannot be joined to the steel pipe. There was a risk of problems. In particular, in Patent Document 2, since the shear reinforcement is in-situ welding at a position surrounded by another beam reinforcing bar set, and because there is a partially upward welding location, the welding operation is complicated and welding is performed. There was a problem that it was difficult to ensure quality.

  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 around the hole, good installation workability to the beam reinforcement, high-quality joint 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 achieving bending prevention and preventing collapse 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 a beam width direction between upper and lower beam main reinforcing bars, and a mold for forming the beam through-hole is separated by a covering thickness. A steel annular reinforcing member for surrounding and encircling, bolt- bonded to the annular reinforcing member, and at least one of the upper and lower beam main reinforcing bars, respectively, and formed on the annular reinforcing member, And a flow part for flowing concrete into and out of the annular reinforcing member , and at least the buckling restraint bar locked to the lower beam main reinforcing bar protrudes inward of the annular reinforcing member. .

  The annular reinforcing member is composed of a plurality of annular reinforcing pieces arranged with a gap in the beam width direction, and each annular reinforcing piece is provided with the buckling restraint muscle, and the flow portion is between the annular reinforcing pieces. It is characterized by being formed with a gap of.

The buckling restraint muscle, by the bolting, wherein the fastening position adjustably fastened is that the annular reinforcing member.

  A 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 an inexpensive steel material, and It is possible to achieve concrete filling in the surrounding area, good installation workability to the beam reinforcement, high quality joining performance, and improved versatility as a part. Prevention of crushing of concrete located above and below the through hole can also be achieved. Specifically, by fastening the buckling restraint bar to the annular reinforcement member, it is possible to adjust the fastening position of the buckling restraint bar with respect to the annular reinforcement member. Accordingly, the buckling restraint muscle can be properly locked to the beam main reinforcement. Moreover, it can utilize as a guide for positioning of a formwork with the buckling restraint muscle protruded inward of the cyclic | annular reinforcement member.

It is a perspective view showing one suitable embodiment of a beam penetration hole reinforcement device concerning the present invention. In FIG. 1, it is an AA arrow directional cross-sectional view. It is a perspective view which shows the state which incorporated the beam through-hole reinforcement apparatus of FIG. 1 in the beam. FIG. 4 is an enlarged front sectional view of a main part of FIG. 3. It is a perspective view which shows the modification of the beam through-hole reinforcement apparatus which concerns on this invention. It is a perspective view which shows the state which incorporated the beam through-hole reinforcement apparatus of FIG. 5 in the beam. It is a principal part expanded side sectional view of FIG.

  Preferred embodiments of a beam through hole reinforcing device and a beam structure according to the present invention will be described below in detail with reference to the accompanying drawings. As shown in FIGS. 1 to 4, 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. 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 provided at the end of the beam 2 or at the center of the beam 2.

  The annular reinforcing member 6 is made of steel and is formed in a hollow cylindrical shape. In the present embodiment, the annular reinforcing member 6 is formed in a circular shape in cross section with a length dimension extending on both side surfaces of the beam 2 in the beam width direction. It is not limited to a circular cross section, and may be a polygonal cross section. The annular reinforcing member 6 may be formed of a circular steel pipe or a square steel pipe, or may be formed by processing and forming a steel plate.

  Inside the annular reinforcing member 6, a mold 8 for forming the beam through hole 5 is installed at the time of construction. The annular reinforcing member 6 is formed with an inner diameter dimension that surrounds the mold 8 with a covering thickness that becomes the fireproof coating X. When the cross-sectional centers of the annular reinforcing member 6 and the mold 8 coincide with each other, the fireproof coating X made of concrete is formed in the annular reinforcing member 6 with a uniform covering thickness. When the center of the cross section does not coincide with the vertical direction or the horizontal direction, a necessary covering thickness is secured in the minimum gap portion between the annular reinforcing member 6 and the mold 8 and the fireproof coating X is formed.

  The annular reinforcing member 6 is formed with a flow hole 9 through the upper and lower portions of the cylindrical surface 6a in the plate thickness direction for allowing the concrete C to flow into and out of the annular reinforcing member 6. The shape, size, and number of the flow holes 9 may be set as appropriate in consideration of the strength of the annular reinforcing member 6 and the flowability of the concrete C.

  The annular reinforcing member 6 is provided with a buckling restraint (rebar) 7. The buckling restraint bars 7 are disposed on the upper and lower portions of the cylindrical surface 6 a of the annular reinforcing member 6 toward the upper and lower beam main bars 3 and 4. A U-shaped hook portion 7 a for locking to the main beam bars 3 and 4 is formed at the tip of the buckling restraint bar 7. What is necessary is just to set suitably the form and dimension of the hook part 7a in the aspect which can be latched to the beam main bars 3 and 4. FIG.

  A threaded portion 7b is formed at the base of the buckling restraint muscle 7, and the threaded portion 7b is inserted into an insertion hole (not shown) formed in the annular reinforcing member 6, and the outside of the annular reinforcing member 6 and It is fastened with a nut 10 from the inside, and is thereby bolted to the annular reinforcing member 6. By setting the length of the screw portion 7b to be long, it is possible to adjust the fastening position of the buckling restraint bar 7 with respect to the annular reinforcing member 6, and accordingly, depending on the height positions of the upper and lower beam main bars 3 and 4 respectively. The hook portion 7a is appropriately locked to the beam main bars 3 and 4. In other words, it is also used for adjusting the height position of the annular reinforcing member 6. Further, the buckling restraint 7 may be joined to the annular reinforcing member 6 by other joining methods such as welding.

  In the illustrated example, two buckling restraining muscles 7 are provided at both the longitudinal end of the annular reinforcing member 6 and at the top and bottom of the central portion with the center in the left-right direction of the annular reinforcing member 6 interposed therebetween. The main beam bars 3 and 4 are locked. The buckling restraint muscle 7 is not limited to two at each of the upper and lower positions, and may be one or three or more. When 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 11 of the beam 2. The buckling suppressing effect of the beam main bars 3 and 4 can be improved.

  Further, the buckling restraint bars 7 may be provided at both ends of the annular reinforcing member 6 in the length direction and locked to the upper and lower beam main bars 3 and 4 on the outermost side in the beam width direction, and are arranged in the beam width direction. You may arrange | position corresponding to either the upper and lower beam main reinforcements 3 and 4. FIG. Further, in the illustrated example, the hook portion 7a of the buckling restraint bar 7 is adapted to be locked to one beam main bar 3 and 4, but a plurality of beams are provided at each of the beam upper end and the beam lower end. It may be formed so as to straddle the main bars 3, 4 and be locked to the plurality of beam main bars 3, 4 or all the beam main bars 3, 4 at once.

  Further, as shown in FIG. 1, the buckling restraint bar 7 is configured so that at least two reinforcing bars can be connected by a coupler 12 of a screw type or a wedge type and the length thereof can be adjusted. May be. In this way, even when the buckling restraint bar 7 is welded to the annular reinforcing member 6, it is possible to adjust the length when locking to the beam main bars 3 and 4, and further to the beam through hole. Since the same thing can be used as the buckling restraint muscle 7 in which the hook part 7a is formed even when 5 and the annular reinforcing member 6 are decentered in the vertical direction with respect to each other and various beams, it is versatile. Becomes higher.

  Furthermore, it is preferable that the base portion (screw portion 7 a) of the buckling restraint muscle 7 protrudes inward of the annular reinforcing member 6. The protruding base portion can support the mold 8 for forming the beam through hole 5 or can be used as a guide for positioning. Further, if the protruding length of the base portion toward the inside of the annular reinforcing member 6 is matched with the covering thickness, the mold frame 8 can be set on the covering thickness, and the covering thickness is secured before the concrete C is placed. It can be visually confirmed whether or not it is done.

  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-framed reinforced concrete beam, and the buckling restraint bar 7 is connected to the beam main bars 3 and 4 and the stirrup. The upper and lower beam main reinforcing bars 3 and 4 of the beam reinforcing bar composed of the bars 11 are positioned and positioned, and a mold 8 for forming the beam through hole 5 is installed inside the annular reinforcing member 6. A beam structure is formed by being embedded in concrete C placed in a formwork.

  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 formwork provided with a beam reinforcing bar set. When installing, after placing the form 8 for forming the beam through hole 5 inside the annular reinforcing member 6, the annular reinforcement member 6 is annularly formed in a space surrounded by the upper and lower beam main bars 3, 4 and the stirrup bar 11. The reinforcing member 6 is inserted. Thereafter, the threaded portion 7 b of the buckling restraint bar 7 in which the hook portion 7 a is locked to the upper and lower beam main bars 3, 4 is fastened to the annular reinforcing member 6 with the nut 10. 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 has a very simple configuration mainly consisting of an annular reinforcing member 6 and upward and downward buckling restraint bars 7 which are locked to the upper and lower beam main bars 3 and 4. The reinforcing member 6 can be installed only by inserting it into a space surrounded by the upper and lower beam main bars 3 and 4 and the stirrup bar 11 and can be installed very easily. Further, the buckling restraint bars 7 are arranged in the vertical direction so as not to interfere with the stirrup bars 11 and are locked to the upper and lower beam main bars 3, 4. Since only the bolt is joined to the annular reinforcing member 6 intensively around the circumference, the joining operation can be performed very simply.

  At this time, the annular reinforcing member 6 can be appropriately positioned by adjusting the fastening position of the buckling restraint muscle 7 to the annular reinforcing member 6 with the nut 10 and the screw portion 7b. With this adjustable flexibility, versatility as a part can be improved. That is, since the annular reinforcing member 6 does not serve as a form 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 diameters. Further, if the buckling restraint bar 7 is prepared with a long and versatile effect and the screw part 7b is also formed long, it can be used for reinforcing the beam main bars 3 and 4 of various beams. Moreover, since it is a bolt joint, versatility increases with the length of the screw portion 7b, and even if there is a processing error in the beam main bars 3, 4 and the annular reinforcing member 6 related to the engagement of the buckling restraint bars 7, it depends on them. Without any problem, the processing error is absorbed by the length of the screw portion 7b, and the beam through-hole reinforcing device 1 can be appropriately assembled.

  In addition, unlike the welding joint, according to the bolt joint, the joint performance can be ensured uniformly and satisfactorily. Further, the base thickness (screw portion 7b) of the buckling restraint 7 projecting inward of the annular reinforcing member 6 enables confirmation of the covering thickness, and support and positioning of the mold 8. The mold frame 8 may be accommodated inside the annular reinforcing member 6 after the annular reinforcing member 6 is supported by the beam main bars 3 and 4. Then, the beam form is completed.

  When concrete C is placed from above the annular reinforcing member 6 in the completed beam formwork, the concrete C flows down around the annular reinforcing member 6 as shown in FIG. 6 also flows into the interior. The concrete C that has flowed in from the flow holes 9 flows out of the lower flow holes 9 and gradually fills between the mold 8 and the annular reinforcing member 6 until the upper flow holes 9 are filled. The concrete C flowing through the flow hole 9 forms a cover that becomes the fireproof coating X between the mold 8 and the annular reinforcing member 6. By placing concrete C on the beam formwork, it is possible to form a cover (fireproof coating X) at once.

  In addition, by flowing out the concrete C from the lower flow hole 9, it is possible to sufficiently spread the concrete C also below the annular reinforcing member 6 that is shaded when viewed from above, preventing the generation of voids, The concrete filling property around the annular reinforcing member 6 can also be improved.

  The concrete C to be placed in the beam form is also filled around the beam reinforcing bar set including the beam main reinforcing bars 3 and 4 and the like, so that the beam 2 made of reinforced concrete can be constructed. After the beam 2 is completed, the formwork 8 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, the confining effect by the annular reinforcing member 6 having a length dimension on both sides of the beam 2 in the beam width direction, the buckling restraint bar 7 provided on the annular reinforcing member 6, and the upper and lower beam main bars 3 and 4. Thus, the concrete C above and below the beam through-hole 5 can be constrained, and the buckling constraining bar 7 acts against the annular reinforcing member 6 to effect the buckling of the beam main bars 3 and 4 on the compression side. Therefore, it is possible to improve the toughness of the beam 2 at 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 this embodiment includes the steel annular reinforcing member 6 for surrounding the mold 8 for forming the beam through-hole 5 with a covering thickness therebetween, and the annular reinforcing member. 6 is formed in the annular reinforcing member 6 and the buckling restraint bar 7 that is joined to at least one of the upper and lower beam main reinforcing bars 3 and 4, respectively, for circulating the concrete C in and out of the annular reinforcing member 6. And the buckling restraint bar 7 is configured to be bolted to the annular reinforcing member 6 so that the fastening position can be adjusted, and such a beam through-hole reinforcing device 1 is made of reinforced concrete or steel reinforced concrete. Since the beam structure is constructed by incorporating it into the beam rebar set of the beam 2, the covering that becomes the fireproof coating X is secured while securing reinforcement around the beam through-hole 5 with a steel material that is cheaper than stainless steel or the like. Easy to form In addition, it is possible to achieve the filling performance of concrete C around the beam through-hole 5, good installation workability to the beam rebar assembly, high quality joining performance, and improved versatility as parts. In contrast, the buckling of the beam main bars 3 and 4 and the collapse of the concrete C positioned above and below the beam through-hole 5 can be achieved.

  In the above-described embodiment, the annular reinforcing member 6 has been described by exemplifying the length extending on both sides of the beam 2 in the beam width direction. However, when the beam width is long, the beam through-hole reinforcement is performed. A plurality of devices 1 may be arranged side by side. Specifically, a plurality of beam through-hole reinforcing devices 1 are installed side by side in the length direction of a single mold 8 having a length that penetrates the beam 2, and each buckling restraint 7 is appropriately set. The upper and lower beam main bars 3 and 4 may be locked. Thereby, the versatility with respect to various beam width dimensions can also be improved as components.

  The modification of the said embodiment is shown by FIGS. In this modification, the annular reinforcing member 6 is constituted by a plurality of annular reinforcing pieces 13 arranged with a gap P in the beam width direction. A buckling restraint 7 is provided on each annular reinforcing piece 13. The distribution part of the concrete C is formed by a gap P between the annular reinforcing pieces 13. The dimensions of each annular reinforcing piece 13 in the beam width direction may be appropriately set in consideration of the above-mentioned shear strength, confining effect, and buckling suppressing action. Other configurations are the same as those in the above embodiment.

  The operation of this modification is also substantially the same as in the above embodiment. In the installation work, the annular reinforcing piece 13 is lighter than the annular reinforcing member 6, so that the buckling restraining muscles 7 are attached in advance, and the annular reinforcing piece 13 is sequentially arranged in the beam width direction by human power. Just install it. At the time of installation, the buckling restraint bar 7 is temporarily fastened and locked to the beam main bars 3 and 4, and then the length is adjusted and finally fastened. The buckling restraint bar 7 may be locked to all the beam main bars 3 and 4 or may be locked to any of the beam main bars 3 and 4.

  Since the annular reinforcing piece 13 is obtained by subdividing the annular reinforcing member 6, versatility with respect to the beam width dimension can be further improved. In addition, since the concrete C placed in the beam form flows inwardly through the gaps P between the annular reinforcing pieces 13, it is possible to form a cover (fireproof coating X), and around the beam through hole 5. It is also possible to ensure good concrete filling properties. 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 Upper and lower beam main reinforcement 5 Beam through-hole 6 Steel annular reinforcement member 7 Buckling restraint 7b Screw part 8 Formwork 9 Flow hole 10 Nut 11 Stirrup reinforcement 13 Annular reinforcement piece C Concrete P Clearance X Fireproof coating

Claims (4)

A reinforcing device for reinforcing a beam through hole formed in the beam width direction between upper and lower beam main bars,
A steel annular reinforcing member for surrounding the formwork for forming the beam through hole with a covering thickness;
A buckling constraining bar which is bolted to the annular reinforcing member and is respectively locked to at least one of the upper and lower beam main bars;
Formed in the annular reinforcing member, and provided with a flow part for flowing concrete into and out of the annular reinforcing member ,
A beam through-hole reinforcing device, wherein at least the buckling restraint bar locked to the lower beam main bar protrudes inward of the annular reinforcing member .   The annular reinforcing member is composed of a plurality of annular reinforcing pieces arranged with a gap in the beam width direction, and each annular reinforcing piece is provided with the buckling restraint muscle, and the flow portion is between the annular reinforcing pieces. The beam through-hole reinforcing device according to claim 1, wherein the beam through-hole reinforcing device is formed with a gap between the two. 3. The beam through-hole reinforcing device according to claim 1, wherein the buckling restraint bar is fastened to the annular reinforcing member by the bolt joint so that a fastening position thereof can be adjusted.   A beam structure constructed by incorporating the beam through-hole reinforcing device according to any one of claims 1 to 3 into a beam reinforcing bar set of a beam made of reinforced concrete or steel reinforced concrete.

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