JP2012062700A - Reinforcement structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure of a building, allowing an opening to be easily constructed for modification.SOLUTION: An opening 170A is formed by cutting a part of floor of a building unit 1A. Floor beams 172 and 172 located at or around the opening are reinforced with floor reinforcement beams 2A and 2B in a girder direction, which link the floor beam 172 and a gable-side floor beam 13 or link the floor beams 172 and 172. Both ends of the floor reinforcement beam are fastened with respective drill screws 22 driven from a lateral side.

Description

  The present invention relates to a reinforcing structure for a building when an opening that is opened in a vertical direction is provided in a building in which a frame structure is formed by beams and pillars.

  Conventionally, in order to form an opening, such as an atrium, in a unit building as a building, reinforcement of a unit building in which a reinforcing member (stiffener) is welded or bolted to a floor beam or a ceiling beam located around the opening. The structure is known (see, for example, Patent Documents 1 and 2).

  The reinforcement of the opening disclosed in Patent Documents 1 and 2 is performed when a unit building is newly constructed, and since it is performed in the process of assembling the building unit at the factory, joining by welding is possible. In addition, in the case of bolt joining, there is almost no restriction on the mounting location, and it can be performed at any location.

  On the other hand, there are cases where the floor of an existing unit building is opened at the time of renovation, and a storage space is provided, or an atrium space from the lower floor to the upper floor is provided, but floor beams and floor joists are used to provide the opening. When cut, the strength will be lower than that of an existing unit building, so it is necessary to reinforce the opening or its periphery.

JP 2008-291489 A JP 2002-54237 A

  However, reinforcement using a welded joint as disclosed in Patent Documents 1 and 2 uses a firearm in an existing building and is difficult to implement in view of the risk of fire.

  Also, if you try to join the reinforcing member to the flange of the beam by bolting, the beams that overlap on the upper and lower floors will be in the way, and there are places where you can not drill bolt holes or screw drill screws. It cannot be reinforced.

  Accordingly, an object of the present invention is to provide a reinforcing structure for a building that can be easily implemented even when an opening is provided during refurbishment.

  In order to achieve the above object, a reinforcing structure for a building according to the present invention is a reinforcing structure for a building in which a frame structure is formed by beams and columns, and the lower edge of the frame structure is a first structure. And a pair of first floor beams disposed substantially parallel to the direction and a pair of second floor beams disposed substantially parallel to the second direction substantially orthogonal to the first direction. A plurality of floor beams extending in the second direction are provided between the first floor beams at intervals in the first direction, and a part of the floor portion of the frame structure is cut. When the opening is formed, the floor reinforcing beam is directed to the first beam with respect to the floor beam positioned at or around the opening, the floor beam and the second floor beam. Or both ends of the floor reinforcing beam are fixed by fastening members inserted from the sides. And wherein the Rukoto.

  Here, the end of the floor reinforcing beam is provided with a mounting portion having a projecting portion projecting in the direction perpendicular to the axis, and the second floor is secured by a fastening member attached to the projecting portion. A beam or the floor beam can be connected to the floor reinforcing beam. Further, the floor reinforcing beam can be arranged at substantially the same height as the floor beam.

  Further, the floor reinforcing beam may be configured to support at least one floor beam from below and to be passed between another floor beam and the second floor beam. . In addition, the floor beam that is cut when the opening is formed may be supported from below by the floor reinforcing beam.

  Further, the second floor beam is formed of a grooved steel or a grooved steel with a lip so that the inner side of the floor is opened, and a mounting plate that comes into contact with the web forming the recess. The floor reinforcing beam may be connected to the second floor beam via a connection fitting extending from the mounting plate and extending downward from the recess.

  Further, at least one of the first floor beam or the second floor beam located in the opening or the periphery thereof is formed by a grooved steel or a grooved steel having a lip so that a floor inner side is opened. The reinforcing beam is disposed along the first floor beam or the second floor beam on the open side of the concave portion, and the web forming the concave portion and the reinforcing beam form a fixing piece at both ends. It can be set as the structure connected by the bent plate-shaped connection member and fastening member which were made.

  Further, the connecting member may have a shape in which a main body portion is substantially parallel to a flange forming the concave portion, and the fixing pieces formed at both ends thereof are protruded in an upside down direction.

  Further, at least two connecting members may be provided in the short direction of the reinforcing beam. Furthermore, the connecting member may be provided at a plurality of intervals in the longitudinal direction of the reinforcing beam. Further, the reinforcing beam may be a grooved steel or a grooved steel with a lip with the open side of the recess facing the open side of the recess.

  The reinforcing structure for a building of the present invention configured as described above is a floor reinforcement in which a floor beam positioned at or around the opening is passed between the floor beam and the second floor beam or between the floor beams. Reinforce with small beams. Further, by interposing the floor reinforcing beam between the floor beam and the second floor beam, the lateral stiffening rigidity of the second floor beam is also improved. Further, both ends of the floor reinforcing beam are fixed by fastening members inserted from the sides.

  For this reason, also when providing an opening part in the existing building, since a floor reinforcement beam can be fixed from an opening part, a building can be easily reinforced.

  In addition, by adding support points by floor reinforcing beam to the second floor beam or floor beam around the opening or the surrounding area, it is possible to compensate for the decrease in support points due to cutting of floor joists or floor beams. In addition, even when a vertical load is newly added, sufficient proof stress can be secured.

  Furthermore, even when the lateral stiffening effect member such as the floor beam or floor joist is removed when the opening is formed, the horizontal rigidity can be sufficiently secured by passing the floor reinforcing beam.

  Moreover, the installation location of a fastening member is easily securable by providing the overhang | projection part projected in the direction orthogonal to an axis at the edge part of a floor reinforcement beam. Here, when the floor-reinforcing beam is arranged at substantially the same height as the floor beam, the floor-reinforcing beam is against deformation caused by the force acting from the side of the second floor beam (deformation in the weak axis direction). It can be fully countered by the axial strength.

  Furthermore, by adopting a configuration in which the floor beam is supported from below by the floor reinforcing beam, it is possible to suppress the occurrence of floor deflection and floor noise around the opening. In particular, when the floor beam is cut when forming the opening, the connection between one end of the floor beam and the first floor beam is released and the floor beam is easily bent. By supporting the end portion of the cut floor beam from below, it is possible to prevent a decrease in strength around the opening.

  In addition, when mounting the floor reinforcing beam that supports the floor beam from below, a connecting metal member extending downward from the mounting plate is used, so that the floor reinforcing beam and the second floor beam are Can be easily connected.

  Further, a reinforcing plate is arranged along the longitudinal direction of the floor beam located in the opening or the periphery thereof, and a bending plate-like connecting member and a fastening member in which a fixing piece is formed at both ends of the web and the reinforcing beam of the floor beam. Further, the opening can be further reinforced by connecting with each other.

  In addition, with such a configuration, it is possible to easily attach the reinforcing beam to the floor beam from the opening at the time of refurbishment. Further, by arranging the reinforcing beam along the floor beam, the strength in the weak axis direction can be increased without reducing the allowable bending stress degree in the strong axis direction of the floor beam. That is, since the lateral stiffening rigidity of the floor beam is enhanced by the arrangement of the reinforcing beam, it is possible to provide an atrium space without reducing the proof strength of the building.

  In addition, when the main body of the connecting member is substantially parallel to the flange of the floor beam, and the fixing pieces formed at both ends thereof protrude in the upside down direction, one fixing piece of the connecting member is When it fixes to the web of a floor beam with a fastening member, it can fix easily, without the other fixing piece getting in the way. Furthermore, it can be easily fixed when the other fixing piece is fixed to the reinforcing beam with a fastening member. And if it is a connection member which has such a shape, it can arrange | position so that it may not interfere with the existing specifications, such as the crosspiece provided in the outer wall material, and the attachment bolt of a reinforcement pillar.

  When at least two connecting members are provided in the transverse direction of the reinforcing beam, the floor beam, the connecting member, and the reinforcing beam form a cross section close to a closed cross section. And the rigidity in the horizontal direction as a whole can be increased with a small amount of members.

  Furthermore, when a plurality of connecting members are provided at intervals in the longitudinal direction of the reinforcing beam, the connecting member can be attached to avoid the place where the floor beam is attached. Even if the part is left as it is or the mounting bracket is left as it is, the reinforcing beam can be attached.

  In addition, when the reinforcing beam is made of grooved steel with the opening side of the recess facing the opening side of the floor beam or the grooved steel with a lip facing each other, the atrium space extending from the lower floor to the upper floor in the existing building At the time of refurbishment such as providing a flange, the rigidity in the horizontal direction can be increased as compared with the case where a plate-like reinforcing beam is used because the reinforcing beam is provided with a flange. Furthermore, since the flange of the reinforcing beam faces the floor beam, the amount of protrusion to the opening can be minimized, and there is no obstacle when attaching the inner wall material or the like.

It is a perspective view explaining the structure of the reinforcement structure of the unit building of embodiment of this invention. It is a perspective view explaining the structure of a building unit. It is sectional drawing explaining the structure of the reinforcement structure of the unit building of embodiment of this invention. (A) is a cross-sectional view as seen in the direction of arrows AA in FIG. 3, (b) is a cross-sectional view as seen in the direction of arrows BB in FIG. 3, and (c) is a view in the direction of arrows CC in FIG. It is sectional drawing seen in the direction. It is a perspective view explaining the structure of the reinforcement structure of the unit building of Example 1. FIG. It is sectional drawing explaining the structure of the reinforcement structure of the unit building of Example 1. FIG. (A) is sectional drawing seen in the DD arrow direction of FIG. 6, (b) is sectional drawing seen in the EE arrow direction of FIG. It is sectional drawing explaining the attachment structure of the reinforcement beam of Example 2. FIG. It is sectional drawing seen in the FF arrow direction of FIG. It is a perspective view explaining the structure of the reinforcement structure of the unit building of Example 2. FIG. It is a top view explaining the structure of the reinforcement structure of the unit building of Example 2. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view in which a part of a building unit 1A is cut and illustrated in order to explain a configuration of a reinforcing structure of a unit building as a building according to the present embodiment. Here, a unit building (not shown) is constructed by installing a plurality of building units 1 adjacent to each other as shown in FIG.

  As shown in FIG. 2, the building unit 1 includes a pillar 11,... As a pillar disposed at a corner, and a floor, a beam, spanned between the lower ends of the pillars 11,. A box-shaped frame structure (frame structure) is formed by the beams (12, 13) and the ceiling beams (15, 16) as beam members spanned between the upper ends of the columns 11,.

  This building unit 1 is formed in a rectangular shape in plan view. The floor beam on the long side (girder side) is used as the girder side floor beam 12 (first floor beam), and the floor beam on the short side (wife side) is used. The wife side floor beam 13 (second floor beam) is used. Further, the ceiling beam on the long side is referred to as the girder side ceiling beam 15, and the ceiling beam on the short side is referred to as the wife side ceiling beam 16.

  Here, the girder-side floor beam 12, the end-side floor beam 13, the girder-side ceiling beam 15, and the end-side ceiling beam 16 are formed of channel steel or channel steel with a lip. In the present embodiment, as shown by the wife side floor beam 13 in FIG. 3, a substantially U-shaped section steel having a cross-sectional view in which the parallel upper and lower flanges 132 and 132 are connected by the web 131 is used. The case will be described.

  As is apparent from FIGS. 1 and 3, the groove steel (such as the wife side floor beam 13) is such that the open side of the recess formed by the flanges 132 and 132 and the web 131 faces the floor inner side (opening 170 A side). It has been.

  Further, as shown in FIG. 2, a plurality of floor beams 172,... Are inserted between the beam-side floor beams 12 and 12 at intervals in the long side direction (also referred to as the first direction or the beam direction). Passed. That is, the floor beam 172 is arranged substantially parallel to the short side direction (also referred to as the second direction or the wife direction), similarly to the wife side floor beam 13.

  The floor beam 172 is formed by a rectangular tubular steel pipe. Further, a mounting bracket 175 having a U-shaped cross section is joined to both ends of the floor beam 172, and the mounting bracket 175 is joined to the girder-side floor beam 12 by welding (see FIG. 1).

  Further, a plurality of wooden floor joists 173,... Are passed between the wife side floor beams 13, 13 on the floor beam 172,. That is, the floor portion 17 includes a plurality of floor beams 172,... Passed between the girder floor beams 12, 12, and the floor beams 172,. Are mainly composed of a plurality of floor joists 173,...

  On the other hand, a plurality of wooden ceiling joists 192,... Extending in the short side direction are bridged between the girder-side ceiling beams 15, 15, and the ceiling material 191 is provided on the lower surface of the ceiling joists 192,. Is attached to form the ceiling portion 19. A wall portion 18 is provided between the columns 11 and 11.

  Further, as shown in FIG. 2, a joint frame member 14 having a substantially U-shaped cross-sectional view is disposed at a joint portion between the column 11 and the girder side floor beam 12 or the wife side floor beam 13. That is, the end face of the joining frame member 14 is brought into contact with the side surface of the column 11 and is joined by welding, and the girder-side floor beam 12 or the wife-side floor beam 13 is joined to the joining frame member 14 by welding. The joining frame member 14 is also used for joining the column 11 and the girder-side ceiling beam 15 or the wife-side ceiling beam 16.

  When remodeling such as renovation, when building a staircase, an elevator, an atrium space or an underfloor storage provided in a living room, etc., a part of the floor 17 of the building unit 1 is cut to open the opening 170A. The building unit 1A shown in FIG. 1 is provided.

  FIG. 1 shows a state in which the floor material 171 is removed for easy understanding of the configuration. Originally, a floor material 171 partially cut off in accordance with the shape of the opening 170A is pasted on the floor joists 173,.

  That is, the opening 170A of the building unit 1A is opened by cutting the floor material 171 immediately above the opening 170A and the floor joists 173A that cross the opening 170A.

  Before the floor joist 173A is cut, like the other floor joists 173, the end portion is placed on the wife side floor beam 13 and fixed to the flange 132 of the wife side floor beam 13 by a fixing screw 174. It was. Moreover, the flooring 171 that existed at the position of the opening 170A was supported by the floor joists 173A before being cut.

  On the other hand, after the opening 170A is provided, the restraint on the opening 170A or its periphery is released and the horizontal rigidity is lowered. Therefore, by arranging the floor reinforcing beamlets 2A and 2B, The floor 17 and the floor beams (12, 13) around the opening 170A are reinforced.

  That is, as shown in FIGS. 1 and 3, the floor reinforcing beam 2A is passed between the wife side floor beam 13 and the floor beam 172 adjacent thereto, and the floor reinforcing beam 2B is inserted between the floor beams 172 and 172. Give it away. These floor reinforcing beam 2A, 2B are formed of, for example, a rectangular tubular steel tube.

  One end of the floor reinforcing beam 2A is bonded to the web 131 of the wife side floor beam 13 and the other end is bonded to the side surface of the floor beam 172. As shown in FIG. 4A, an end face plate 21 as an attachment portion is joined to the end portion of the floor reinforcing beam 2A to be joined to the wife side floor beam 13 through welded portions 23 and 23. .

  The end face plate 21 has a larger area than the cross section of the floor reinforcing beam 2A, and as shown in FIG. 4 (a), a portion protruding to the side (axis orthogonal direction) of the floor reinforcing beam 2A is stretched. It becomes the output parts 21a and 21a.

  Then, the back surface of the end face plate 21 is brought into contact with the side surface on the floor inner side of the web 131, and the drill screws 22 as a fastening member are screwed into the projecting portions 21a and 21a from the floor inner side, One end of the floor reinforcing beam 2A is fixed to the wife side floor beam 13.

  On the other hand, the other end of the floor reinforcing beam 2A and the other end of the floor reinforcing beam 2B are connected to the floor beam via an attachment portion constituted by the end face plate 21 and the L bracket 24 as shown in FIG. 172 is joined to the side surface.

  The end portion of the floor reinforcing beam 2B (2A) is placed on an L-shaped metal fitting 24 having a substantially L-shaped cross section joined to the end face plate 21 via a welded portion 23. It is fixed to the metal fitting 24.

  Further, the end face plate 21 is brought into contact with the side surface of the floor beam 172, and the drill screws 22,... Are screwed into the projecting portions 21a and 21a from the side, whereby the floor reinforcing beam 2B. The end of (2A) is fixed to the floor beam 172.

  Further, the end of the other floor reinforcing beam 2B is joined to the side surface of the floor beam 172 via an end face plate 21 as an attachment portion, as shown in FIG. 4 (c). That is, the rear surface of the end face plate 21 is brought into contact with the side surface of the floor beam 172 on the opening 170A side, and the drill screws 22 as a fastening member are twisted from the opening 170A side to the projecting portions 21a and 21a. As a result, the end of the floor reinforcing beam 2B is fixed to the floor beam 172.

  Further, as shown in FIG. 1, between the wife side floor beam 13 and the floor beam 172 adjacent thereto, the floor reinforcement beam 2A, 2A is passed in parallel at two locations around the opening 170A.

  The arrangement positions of these floor reinforcing beam 2A, 2A, 2B can be appropriately changed according to the purpose of use of the opening 170A. For example, when a member such as a staircase or an elevator is attached to the opening 170A, a vertical load such as its own weight is added, so that the floor reinforcing beam 2A, 2A, 2B may be arranged.

  Next, the effect | action of the reinforcement structure of the unit building of this Embodiment is demonstrated.

  The reinforcing structure of the unit building of the present invention configured as described above is that the floor beams 172 and 172 located in the opening 170A or the periphery thereof are arranged between the floor beam 172 and the wife side floor beam 13 and the floor beam. Reinforced by floor reinforcing beam 2A, 2B passed between 172,172.

  Further, when the floor joists 173A,... Are cut when the opening 170A is formed, the lateral stiffening effect member is removed, and a horizontal load such as a wind load or an earthquake load is applied to the wife side floor beam 13. However, the rigidity in the horizontal direction is compensated by interposing the floor reinforcing beam beams 2A, 2A, 2B, and the deformation of the wife side floor beam 13 is reduced. Can be suppressed.

  And both ends of floor reinforcement beam 2A, 2B are fixed by drill screw 22, ... inserted from the side which becomes the opening 170A side, respectively.

  For this reason, also when providing opening part 170A in the existing unit building, since floor reinforcement beam 2A, 2B can be fixed from opening part 170A, a unit building can be easily reinforced.

  In addition, when a floor-mounted elevator or the like is newly provided using the opening 170A, the vertical loading of a member or equipment used for the elevator on the floor beam 172 and the floor reinforcing beam 2A, 2B of the opening 170A Will act.

  Even when a new load is added to the unit building in this way, sufficient strength is ensured if the supporting points of the floor beam 172 and the wife side floor beam 13 are provided by the floor reinforcing beam 2A, 2B. be able to.

  Further, by providing an overhanging portion 21a protruding in the direction perpendicular to the axis at the end of the floor reinforcing beam 2A, 2B, the drill screw 22,... Can be easily made from the side using the opening 170A. It is possible to secure a mounting location that can be mounted.

  Furthermore, if the floor reinforcing beam 2A, 2B is disposed at substantially the same height as the floor beam 172, the axial force member between the floor beam 172 and the wife side floor beam 13 and between the floor beams 172, 172. The axial strength of the floor-reinforcing beam beams 2A and 2B is sufficient for horizontal deformation (deformation in the weak axis direction) due to the force acting from the side of the wife side floor beam 13. Can be countered.

  Hereinafter, Example 1 of a form different from the above-described embodiment will be described with reference to FIGS. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  The opening 170A of the above embodiment is formed by cutting the floor material 171 and the floor joist 173A. However, the opening 170B of Example 1 is a floor material 171 of the building unit 1B as shown in FIG. The floor joist 173A and the floor beam 172A are cut.

  Reinforcement using the floor reinforcing beam 3 is performed on the opening 170B thus formed or in the vicinity thereof. The floor reinforcing beam 3 is formed of, for example, a rectangular tubular steel pipe.

  The floor reinforcing beam 3 passes under the cut floor beam 172A and is passed between another floor beam 172 adjacent thereto and the wife side floor beam 13. The end of the cut floor beam 172A is placed on the floor reinforcing beam 3 and supported from below by the floor reinforcing beam 3.

  As shown in FIG. 6, one end of the floor reinforcing beam 3 is bonded to the web 131 of the wife floor beam 13 and the other end is bonded to the side surface of the floor beam 172. As shown in FIGS. 6 and 7A, a beam-side attachment portion 31 as an attachment portion is provided at the end of the floor reinforcing beam 3 joined to the end-side floor beam 13.

  The beam-side mounting portion 31 includes a mounting plate 311 to be brought into contact with the web 131, and a connection bracket 312 having a substantially inverted L shape in side view joined to the surface of the mounting plate 311 on the opening 170B side via the welded portion 23. And an L metal fitting 313 interposed between the connecting metal fitting 312 and the end of the floor reinforcing beam 3.

  As shown in FIG. 6, the connection fitting 312 is spaced apart from an inverted L-shaped L-shaped plate 312a, which has a side edge abutting against the mounting plate 311 and protrudes from the flange 132 and then hangs downward. And a rectangular plate 312b that closes between the side edges of the L-shaped plates 312a and 312a on the floor inner side (opening 170B side) attached to the mounting plate 311 in parallel.

  By interposing a connection fitting 312 extending from the recessed portion of the wife side floor beam 13 and extending downward, the mounting position of the floor reinforcing beam 3 is set higher than the floor beams 172A and 172 and the wife side floor beam 13. Can be in a low position.

  And the L metal fitting 313 is joined to the lower part of this rectangular plate 312b via the welding part 23. FIG. Further, the end portion of the floor reinforcing beam 3 is placed on the L metal fitting 313 and fixed to the L metal fitting 313 by the drill screws 22 and 22.

  On the other hand, the other end of the floor reinforcing beam 3 is joined to the side surface of the floor beam 172 via a long plate 32 as an attachment portion, as shown in FIGS. 6 and 7B. The long plate 32 is formed of a rectangular steel plate having a long side longer than the height of the floor beam 172.

  Then, the end portion of the floor reinforcing beam 3 is joined to the lower portion of the long plate 32 via the welded portion 23. Further, by inserting the drill screws 22, 22 as fastening members from the opening 170 </ b> B side into the protruding portion 32 a of the long plate 32 protruding above the floor reinforcing beam 3, the floor reinforcing beam 3 is fixed to the floor beam 172.

  In this way, the floor reinforcing beam 3 arranged at a position lower than the floor beam 172 is cut by supporting the end portion of the floor beam 172A that is cut when forming the opening 170B from below. It is possible to prevent a decrease in strength around the floor beam 172A.

  For example, it is necessary to cut at least one floor beam 172 in order to form a wide space, but the cut floor beam 172A is disconnected from the girder floor beam 12, so that reinforcement is achieved. Without it, it becomes easy to bend. When the floor beam 172A is easily bent, the floor material 171 around the opening 170B supported by the floor beam 172A via the floor joists 173 is insufficiently supported, and floor deflection and floor noise are caused. Cause it to occur.

  On the other hand, if the end of the cut floor beam 172A is supported by the floor reinforcing beam 3 from below, the deformation of the floor beam 172A is suppressed, and the floor deflection and floor noise around the opening 170B are suppressed. Occurrence can be prevented.

  Further, the rigidity in the horizontal direction (weak axis direction) of the wife side floor beam 13 is also compensated by the floor reinforcing beam 3 that connects the wife side floor beam 13 and the floor beam 172. It is possible to suppress the deformation of the wife side floor beam 13 against a horizontal load acting from the side.

  Further, when the floor reinforcing beam 3 is arranged at a position lower than the floor beams 172 and 172A in this way, a connection fitting 312 extending downward from the mounting plate 311 to be brought into contact with the web 131 is used. Thus, it is possible to easily connect the floor reinforcing beam 3 and the wife side floor beam 13 without reducing the strength of the end portion.

  Furthermore, if the floor reinforcing beam 3 is disposed at a low position where it passes under the floor beam 172A, the space at the height of the floor beams 172 and 172A can be used effectively.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, Example 2 of a form different from the above-described embodiment or Example 1 will be described with reference to FIGS. The description of the same or equivalent parts as those described in the above embodiment or Example 1 will be given the same reference numerals.

  In Example 2, not only the reinforcement by the floor reinforcing beam 2A, 2B, 3 as described in the above embodiment or Example 1, but also the girder-side floor beam 12 and the wife-side floor beam 13 around the opening 170C. The structure which reinforces directly with the reinforcement beam 4 is demonstrated.

  For example, if a large opening 170C as shown in FIG. 10 is formed in order to form a blow-through space, the floor beam 172A is cut and the lateral stiffening rigidity of the girder-side floor beam 12 is reduced. become.

  Further, in order to secure a wide space where the member does not lie as the opening 170C, the position where the floor reinforcing beam 2C, 3A is disposed is also limited under the floor material 171 around the opening 170C. .

  Therefore, in the second embodiment, the reinforcing beam 4 is used to reinforce the beam-side floor beam 12 and the wife-side floor beam 13 facing the opening 170C. As shown in FIGS. 10 and 11, the reinforcing beam 4 is a long steel material disposed along the axial direction of the girder-side floor beam 12 and the wife-side floor beam 13.

  For example, as shown in FIG. 8, the reinforcing beam 4 is formed of channel steel having a substantially U-shape in cross section in which parallel upper and lower flanges 42 and 42 are connected by a web 41. Further, the reinforcing beam 4 is arranged in a state where the opening side of the recessed portion of the reinforcing beam 4 is opposed to the opening side of the recessed portion of the wife side floor beam 13 (or the girder side floor beam 12).

  The reinforcing beam 4 is connected to the web 131 of the wife side floor beam 13 (or the girder side floor beam 12) by connecting members 43 and 43 arranged at intervals in the vertical direction (short direction of the reinforcing beam 4). Is done. As shown in FIGS. 10 and 11, the connecting members 43 and 43 are provided at intervals in the longitudinal direction of the reinforcing beam 4.

  As shown in FIG. 8, the connecting member 43 is formed by bending a steel plate. Specifically, the main body portion 431 of the connecting member 43 is substantially parallel to the flange 132, and the end portion of the main body portion 431 on the side of the end floor beam 13 is bent upward at a right angle with respect to the main body portion 431, thereby fixing pieces. 432 is formed. Further, the end on the reinforcing beam 4 side is bent at a right angle downward with respect to the main body 431 to form a fixed piece 433. That is, the fixing pieces 432 and 433 formed at both ends of the main body 431 have a shape protruding in the upside down direction.

  Further, the fixing piece 432 that comes into contact with the web 131 of the wife side floor beam 13 is fixed to the web 131 by a drill screw 434 as a fastening member. The drill screw 434 can be screwed in from the side using the opening 170C.

  FIG. 9 is a view showing the front of the connecting members 43, 43 as seen in the direction of the arrow F-F in FIG. The drill screw 434 screwed into the fixing piece 432 of the lower connecting member 43 is covered with the fixing piece 433 of the upper connecting member 43 and cannot be seen from the side, but the lower connecting member 43 is attached first. By doing so, the upper and lower connecting members 43, 43 can be easily fixed from the side.

  Moreover, if it is the connection member 43 which has such a shape, it can be attached to the wife side floor beam 13 without interfering with the existing specifications such as a crosspiece provided on the outer wall material and a mounting bolt of the reinforcing column. .

  Furthermore, the web 41 of the reinforcing beam 4 is brought into contact with the fixing pieces 433 and 433 exposed on the opening 170C side, and the drill screws 434 and 434 are screwed in from the opening 170C side, thereby reinforcing the reinforcing beam. 4 can be easily fixed to the connecting members 43 and 43.

  In this way, the reinforcing beams 4 and 4 are arranged along the longitudinal direction of the floor beam (12, 13) located in the opening 170C or the periphery thereof, and the web 131 and the reinforcing beam 4 of the floor beam (12, 13) are arranged. If the bending plate-like connecting member 43 having the fixing pieces 432 and 433 formed at both ends is connected by the drill screw 434, the allowable bending stress degree in the strong axis direction of the floor beam (12, 13) itself is reduced. In addition, the strength of the floor beam in the weak axis direction (horizontal rigidity against the force acting from the side of the floor beam) can be increased.

  As shown in FIGS. 10 and 11, floor reinforcing beam 2C and 3A are arranged around the opening 170C. By the floor reinforcing beam 2C, the ends of the cut floor joists 173A,... Are supported from below.

  The floor reinforcing beam 2C is substantially parallel to the floor beam 172 and is disposed at substantially the same height as the floor beam 172. Further, as shown in FIG. 11, the end of the floor reinforcing beam 2C on the side of the girder side floor beam 12 is attached to the girder side floor beam 12 by a drill screw 22 through an end face plate 21 and an L bracket 24 as an attachment portion. Fixed to.

  The other end of the floor reinforcing beam 2C is placed on the floor reinforcing beam 3A. The floor reinforcing beam 3A passes between the cut floor beam 172A and the floor reinforcing beam 2C, and is passed between the wife floor beam 13 and the floor beam 172.

  As shown in FIG. 11, an attachment portion is formed by an attachment plate 311, a connection fitting 312, and an L fitting 313 at the end of the floor reinforcing beam 3 </ b> A on the end side beam 13 side. Are fixed to the wife side floor beam 13 by screwing drill screws 22,... Into the overhanging portion 311a.

  Further, a long plate 32 is provided as an attachment portion at the other end of the floor reinforcing beam 3A, and the long plate 32 is brought into contact with the side surface of the floor beam 172 that is not cut around the opening 170C. It is fixed by screwing in the drill screw 22.

  Further, the end portion of the cut floor beam 172A placed on the floor reinforcing beam 3A is fixed to the floor reinforcing beam 3A by a mounting bracket 33 as a mounting portion and a drill screw 22,. The

  And the end of the floor reinforcing beam 2C placed on the floor reinforcing beam 3A is the same as the end of the floor beam 172A, the mounting bracket 33 as the mounting part and the drill screw 22,. Is fixed to the floor reinforcing beam 3A.

  Thus, in Example 2, the four sides of the opening 170C are reinforced by the reinforcing beams 4 and 4 and the floor reinforcing beam 2C and 3A. In FIG. 10, the reinforcing beams 5 and 5 arranged along the girder-side ceiling beam 15 and the wife-side ceiling beam 16 facing the opening 170C are also illustrated. The reinforcing beam 5 is also connected to the ceiling beam (15, 16) using the same member as the connecting member 43.

  Here, by arranging the floor reinforcing beam 2C, the ends of the cut floor joists 173A,... Are supported from below, and the floor 17 around the opening 170C is reinforced. .

  Further, the horizontal rigidity reduced by the cutting of the floor beam 172A, which is the lateral stiffening effect member of the girder-side floor beam 12, can be compensated by adding a support point by the floor reinforcing beam 2C.

  Furthermore, by arranging the floor reinforcing beam 3A, the ends of the cut floor beam 172A and the floor reinforcing beam 2C are supported from below, and the floor 17 around the opening 170C is reinforced. Is done.

  Moreover, the horizontal rigidity reduced by the cutting of the floor joists 173A,... Which was the lateral stiffening effect member of the wife side floor beam 13 can be compensated by adding a support point by the floor reinforcing beam 3A. it can.

  In this way, the reinforcing beams 4 and 4 are arranged along the longitudinal direction of the floor beam (12, 13) located in the opening 170C or the periphery thereof, and the web 131 and the reinforcing beam 4 of the floor beam (12, 13) are arranged. In addition to the reinforcing effect by the floor reinforcing beam beams 2C, 3A, by connecting the connecting members 43, 43 having the bent pieces 432, 433 formed at the both ends with the drill screws 434,. The opening 170C can be reinforced. For this reason, it is possible to newly provide an atrium space at the time of refurbishment without reducing the strength of the existing unit building.

  When at least two connecting members 43, 43 are provided in the short direction of the reinforcing beam 4, the floor beam (12, 13), the connecting members 43, 43, and the reinforcing beam 4 are close to a closed cross section. Thus, the allowable bending stress degree of the floor beams (12, 13) can be increased. Furthermore, if it is the structure which uses the connection members 43 and 43 arrange | positioned at intervals, the rigidity of the horizontal direction of a floor beam (12, 13) can be raised with a small amount of members.

  Further, as shown in FIGS. 10 and 11, a plurality of connecting members 43, 43 are provided at intervals in the longitudinal direction of the reinforcing beam 4, so that a place where the floor beam 172 is attached is avoided. The connecting member 43 can be attached. For this reason, the reinforcing beam 4 can be attached even if the end portion of the floor beam 172 is left as it is or the mounting bracket 175 is left as it is.

  Further, the reinforcing beam 4 is formed of a grooved steel with the opening side of the recess facing the opening side of the recess of the floor beam (12, 13) or a grooved steel with a lip, so that the existing unit building can be installed. At the time of refurbishment such as providing an atrium space from the floor to the upper floor, the rigidity in the horizontal direction can be increased compared to the case where the reinforcing beams 4 are provided with the flanges 42, 42 as compared with the case where plate-shaped reinforcing beams are used.

  Further, if the flanges 42, 42 of the reinforcing beam 4 face the floor beam side and are accommodated in the recesses of the floor beam (12, 13), the amount of protrusion to the opening 170C can be minimized, There is no hindrance when attaching inner wall materials.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to the embodiment and the example, and the design change is within a range not departing from the gist of the present invention. Are included in the present invention.

  For example, in the above-described embodiment or example, the first floor beam is the girder side floor beam 12 and the second floor beam is the wife side floor beam 13. However, the present invention is not limited to this. May be the wife side floor beam, and the second floor beam may be the girder side floor beam. Moreover, the length of a 1st floor beam and a 2nd floor beam may be the same.

  Moreover, in the said embodiment or Example, although the case where the drill screws 22 and 434 were used as a fastening member was demonstrated, it is not limited to this, For example, a hole is drilled with drilling machines, such as a drill, or existing If one hole can be used, one-side bolts, screws, screws, etc. can be used as the fastening member.

  Further, in the above-described embodiment or example, the case where the openings 170A-170C are provided in a part of the building unit 1A-1C has been described. However, the present invention is not limited to this, and the openings are provided at a plurality of locations in the unit building. The present invention can also be applied in the case of providing

  In the above-described embodiment, the floor beam 172 of the opening 170A is supported from both sides by the floor reinforcing beam 2A, 2B. However, the present invention is not limited to this, and depending on the desired strength, Only one floor reinforcing beam 2A (2B) may be arranged.

  Further, in the first and second embodiments, the floor reinforcing beam 3 and 3A only passes under one floor beam 172A, but the present invention is not limited to this. It may be a floor-reinforced beam that passes under the beams 172,.

  Moreover, in the said Example 2, although both the girder side floor beam 12 and the wife side floor beam 13 which faced the opening part 170C were reinforced with the reinforcement beams 4 and 4, it is not limited to this, either one It is only necessary to reinforce.

  Furthermore, although the said embodiment or Example demonstrated the reinforcement structure of the unit building comprised by adjoining the building unit 1 (1A-1C) which is a ramen structure adjacently, it is not limited to this Absent. For example, the present invention can be applied to a steel structure building in which a frame structure assembled by a beam material and a column material using lightweight steel is formed.

1,1A-1C Building unit (frame structure)
11 Pillar (column material)
12 Girder-side floor beam (first floor beam, beam material)
13 Wife side floor beam (second floor beam, beam material)
131 Web 132 Flange 15 Girder-side ceiling beam (beam material)
16 Wife side ceiling beam (beam material)
17 Floor portion 172, 172A Floor beam 173, 173A Floor joist 170A Opening 2A, 2B Floor reinforcement beam 21 End plate (mounting part)
21a Overhang part 170B Opening part 3 Floor reinforcement beam 31 Beam side attachment part (attachment part)
311 Mounting plate 311a Overhang portion 312 Connecting bracket 32 Long plate (mounting portion)
32a Overhang part 170C Opening part 2C, 3A Floor reinforcement beam 33 Mounting bracket (mounting part)
4 Reinforcement beam 41 Web 42 Flange 43 Connecting member 431 Main body 432, 433 Fixed piece

Claims (11)

A building reinforcement structure in which a frame structure is formed by beams and pillars,
The lower edge of the frame structure is a pair of first floor beams arranged substantially parallel to the first direction and a pair arranged substantially parallel to the second direction substantially orthogonal to the first direction. And a plurality of floor beams directed in the second direction are provided between the first floor beams at intervals in the first direction.
When a part of the floor portion of the frame structure is cut to form an opening, a floor reinforcing beam that faces the first direction with respect to the floor beam positioned at or around the opening. Is passed between the floor beam and the second floor beam or between the floor beam, and both ends of the floor reinforcing beam are fixed by fastening members respectively inserted from the sides. Reinforced structure.   The end of the floor reinforcing beam is provided with a mounting portion having a protruding portion protruding in the direction perpendicular to the axis, and the second floor beam or the above-mentioned member is attached by a fastening member attached to the protruding portion. The building reinforcing structure according to claim 1, wherein a floor beam is connected to the floor reinforcing beam.   The building reinforcing structure according to claim 1, wherein the floor reinforcing beam is arranged at substantially the same height as the floor beam.   2. The floor reinforcing beam is supported between at least one floor beam from below and is passed between the other floor beam and the second floor beam. Or the reinforcement structure of the building of 2.   5. The building reinforcing structure according to claim 4, wherein the floor beam that is cut when forming the opening is supported from below by the floor reinforcing beam.   The second floor beam is formed of a grooved steel or a grooved steel with a lip so that the inner side of the floor is opened, and a mounting plate to be brought into contact with the web forming the recess, 6. The building according to claim 4, wherein the floor reinforcing beam is connected to the second floor beam via a connection fitting that protrudes from the recessed portion and extends downward from the mounting plate. Reinforced structure. At least one of the first floor beam or the second floor beam located in the opening or its periphery is formed of a grooved steel or a grooved steel with a lip so that a concave portion is directed so that the inner side of the floor is opened. A reinforcing beam is disposed along the first floor beam or the second floor beam on the open side of the recess,
The web forming the concave portion and the reinforcing beam are connected by a bent plate-like connecting member having fastening pieces formed at both ends and a fastening member. Reinforcement structure of the building described in 2.   8. The connection member according to claim 7, wherein a main body portion is substantially parallel to a flange forming the concave portion, and the fixing pieces formed at both ends thereof are protruded in an upside down direction. Reinforcement structure of the building described.   The building reinforcing structure according to claim 7 or 8, wherein at least two of the connecting members are provided in a short direction of the reinforcing beam.   The building reinforcing structure according to claim 7, wherein a plurality of the connecting members are provided at intervals in the longitudinal direction of the reinforcing beam.   The said reinforcing beam is the grooved steel or the grooved steel with a lip which made the open | release side of the recessed part facing the open side of the said recessed part, The Claims 1 thru | or 10 characterized by the above-mentioned. Reinforcement structure of the building.