JP2014231680A - Earthquake-resistant reinforcement structure of suspension ceiling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage of a joining part between a ceiling joist and a ceiling material, by preventing buckling and torsional deformation, when a ceiling joist receiver receives horizontal force from the ceiling material, in a suspension ceiling in which the ceiling joist for supporting the ceiling material is connected to the ceiling joist receiver, by supporting the ceiling joist receiver by a lower end part of a suspension material suspended from a skeleton.SOLUTION: An additional ceiling joist 9 is arranged toward the axial direction in the direction for crossing with the axial direction of a ceiling joist receiver 5, in a section between a lower end part of a suspension material 2 in the total length of the ceiling joist receiver 5 and a lower end part of a brace 8 arranged on at least one side of the suspension material 2 and installed between a skeleton 1 and the ceiling joist receiver 5, and is connected to the ceiling joist receiver 5. The additional ceiling joist 9 is arranged on the under surface side of the ceiling joist receiver 5, and is connected to a ceiling material 7.

Description

  In the suspended ceiling in which the field edge support is supported on the lower end portion of the suspension member suspended from the frame, and the field edge supporting the ceiling material is connected to the field edge support, the field edge support receives a horizontal force from the ceiling material. The present invention relates to a seismic reinforcement structure for a suspended ceiling that prevents buckling and torsional deformation caused by the above, and prevents damage to the joint between the field edge and the ceiling material.

  Suspended ceiling with braces suspended from the upper floor slabs, beams, etc., and suspended from both sides of the suspended material or between one side of the suspended material and the ceiling material (ceiling finishing material) Then, the brace imparts rigidity to the ceiling material, reduces the amount of displacement of the ceiling material, and prevents the ceiling material from being damaged by transmitting it to the frame while bearing the horizontal force acting on the ceiling material ( (See Patent Documents 1 to 4). Part of the horizontal force in the field axis direction acting on the ceiling material is transmitted from the field edge to the frame through the brace in that direction, and part of the horizontal force in the field edge axis direction is transmitted from the field edge to the brace in that direction. It is transmitted to the chassis through.

  For example, as shown in FIGS. 12- (a) and (b), when the lower end portion of the brace cannot be connected to the lower end portion of the suspension member due to the relationship between the distance between the adjacent suspension members and the inclination angle with respect to the horizontal plane of the brace. Since the lower end of the brace is connected to the field receiver, a distance is secured between the lower end of the suspension member and the lower end of the brace in the axial direction of the field receiver. In this case, when an axial force alternately acts on the field receiver, such as during an earthquake, the node between the field receiver and one brace (the lower end of the brace) and the node between the other brace (the lower end of the brace) Compression force may occur in the section between The brace may be disposed only on one side of the suspension member as shown in FIG. 12- (b). In this case, the suspension member bears a compressive force because it resists the vertical component of the reaction force from the brace.

  Under conditions where the vibration speed generated in the ceiling material is large, such as during an earthquake, the axial force does not become uniform over the entire length when the axial force generated in the field edge is alternately repeated in the positive and negative directions. It is assumed that a difference occurs in the axial force in the section between each node with the suspension member and each node with the brace. In such a situation, a compressive force may be generated in the section between the node of the field edge receiver and the brace node, which may cause buckling of the field edge receiver.

  When the braces are arranged in pairs on both sides of the suspension material, a compressive force is generated between the joints of the field receiver and the braces on both sides. A compressive force is generated in the section between the joint between the suspension bridge and the brace, and when the pair of braces bear the axial force of the field bridge, they are separated from both braces. It can also occur when the horizontal component of the reaction force is different.

  Also, in the crossing direction, such as the direction perpendicular to the axial direction of the field receiver (width direction), horizontal force is transmitted from the field edge connected to the lower surface of the field receiver to the field receiver when the ceiling material vibrates. Then, the horizontal edge acts as a horizontal force in the width direction, but since this horizontal force acts on the lower surface side of the field edge receiver, it tries to generate a torsional moment in the field edge receiver. In particular, as shown in FIG. 10- (a), when braces 82 and 82 are installed on the upper surface side of the field receiver 5 in the plane including its width direction, It is assumed that the reaction force causes a torsional moment to act on the field edge receiver 5 to cause torsional deformation.

  As shown in FIG. 10- (a), braces 82, 82 are connected in the plane including the width direction of the field edge receiver 5 in the middle between the field edges 6, 6 adjacent to each other in the axial direction of the field edge receiver 5. If it is, the axial force of the field edge 6 acting on the lower surface side of the field edge receiver 5 on the cross section orthogonal to the axial direction of the field edge receiver 5 and the upper surface side as shown in FIG. The horizontal component of the reaction force from the braces 82 is reversed. For this reason, the axial force of the field edge 6 and the reaction force of the brace 82 form a couple, and a torsional moment is generated in the section between the connection parts of the field edge receiver 5 with the adjacent field edges 6, 6. The field receiver 5 is easily twisted and deformed.

  As a result, buckling occurs in the section between the lower end of the suspension member 2 and the lower end of the brace 8 in the axial direction of the field edge receiver 5, and torsional deformation occurs in the section between adjacent field edges in the width direction. The influence of the deformation in the axial direction and the width direction of the field receiver 5 affects not only the joint part between the field edge 6 and the ceiling member 7, but also the joint part between the ceiling members 7, 7 and the like, and these joint parts may be damaged. There is sex.

Japanese Patent Laying-Open No. 2005-240538 (Claim 1, paragraphs 0030 and 0035, FIGS. 1, 3, and 4) JP 2007-239441 A (Claims 1 to 4, paragraphs 0022 to 0039, FIGS. 1 to 4) Japanese Patent Laying-Open No. 2007-291176 (Claim 3, paragraphs 0037 to 0043, FIGS. 1, 4, and 5) JP 2009-167737 A (Claim 3, paragraphs 0040 to 0044, FIGS. 1 to 3) JP 2009-243228 A (Claim 10, paragraphs 0036 to 0038, FIG. 1) JP2011-047134 (paragraph 0016, FIG. 1)

  Patent Documents 1 and 5 focus on the occurrence of buckling in braces or suspension materials, and Patent Document 3 focuses on the occurrence of buckling in the field edge. There are no examples of attention. In particular, as shown in FIG. 12, the lower end of the brace is connected to the edge receiver in a state where a distance is secured between the lower end of the suspension member and the lower end of the brace or between the lower ends of the pair of braces. There is no example showing an example of countermeasures for preventing buckling that may occur in the field edge in the event of a failure.

  The present invention is based on the above background, and buckling and twisting of the field edge receiver when both the lower edge parts are connected to the field edge receiver in a state where a distance is secured between the lower edge part of the suspension material and the lower edge part of the brace. We propose a seismic reinforcement structure for suspended ceilings that can prevent deformation.

In the seismic reinforcement structure for a suspended ceiling according to the first aspect of the present invention, a field edge receiver is supported at a lower end portion of a suspension member suspended from a frame, and a field edge supporting the ceiling material is connected to the field edge receiver, In the suspended ceiling in which a brace is installed on at least one side of the suspension material between the housing and the field edge receiver, and the lower end of the brace is connected to the field edge receiver,
An additional field edge is arranged in the section between the lower end portion of the suspension member and the lower end portion of the brace, with the field direction facing the axial direction in the direction intersecting the axial direction of the field edge receiver. And is connected to the field receiver.

  The fact that the field receiver is supported by the lower end of the suspension material is simply supported by the lower edge of the suspension material so that it can move in the axial direction relative to the lower end of the suspension material, for example. And the case of being connected (restrained) while being supported. When the field guard is connected to the lower end of the suspension, the lower end of the suspension serves to reduce the buckling length of the field receiver, so the buckling length of the field receiver It is a section from a lower end part to a connection part with a lower end part of a brace connected to a field edge receiver.

  "At least on one side of the suspension material" means that a brace is installed between the frame and the field edge receiver as a pair with the suspension material sandwiched as shown in FIG. 12- (a). As shown in the above, it is said that the brace may be laid between the frame and the field receiver only on one side of the suspension material. “Pairing across the suspension material” means that the brace is paired in the surface direction including the axial direction of the field receiver and the axial direction of the field receiver such as the width direction of the field receiver. There may be a pair in the composition direction including the direction. The frame is a slab or the like on the upper floor in the case of reinforced concrete, and indicates a structural member such as a beam (girder) in the case of steel.

  Since the braces are installed in two directions on a plane in principle, they are arranged in a composition direction including the axial direction of the field receiver and a composition direction including a direction intersecting the axial direction of the field receiver. Since the suspension material supports the ceiling material, the field edge, the field edge receiver, and the brace, it mainly bears the tensile force, but the brace is arranged only on one side of the suspension material as shown in FIG. In some cases, the vertical component of the reaction force generated in the brace is received and the compressive force is borne.

  The direction intersecting the axial direction of the field receiver (hereinafter referred to as the width direction of the field receiver in this item) is perpendicular to the axial direction of the field receiver (the width direction of the field receiver) and its direction. Including a direction inclined with respect to. As described above, the brace erected in the surface direction including the axial direction of the field receiver (hereinafter referred to as the axial brace 81 in this item) causes the field receiver to buckle, A brace constructed in the construction direction including the width direction and the like (hereinafter referred to as a brace 82 in the width direction in this item) may cause a torsional deformation in the field edge receiver.

  When the braces in the axial direction and the braces in the width direction are paired across the suspension material, they are basically arranged symmetrically with respect to the axis of the suspension material, but placed closer to the periphery of the space under the frame (ceiling pocket) The braces may not be arranged in a line-symmetrical manner with the suspension material in between due to restrictions such as the distance between the suspension material and the surrounding wall or the arrangement of the equipment in the ceiling. In both the axial direction and the width direction, the upper end portion of the brace is directly connected to the housing or indirectly via a connecting part. The lower end of the axial brace is connected directly or indirectly to the field guard. The lower end portion of the brace in the width direction is directly or indirectly connected to a field edge receiver or an additional field edge receiver described later.

  The field edge receiver is supported by the lower end portion of the suspension material, but when connected, the lower edge portion of the suspension material is directly or indirectly connected to the field edge reception device. An additional field edge is arranged in a section between the lower end part of the suspension member and the lower end part of the brace in the axial direction, and is directly or indirectly connected to the field edge receiver. When the braces in the axial direction are paired across the suspension material, the suspension material is connected in the middle between the lower end portions of the two braces of the field edge receiver. It is arranged in a section between the lower ends of the braces.

  “Axial brace lower end” refers to the area where the brace overlaps with the field receiver in the axial direction of the field receiver on the plane, and “Between the lower end of the suspension material and the lower end of the axial brace. As shown by an arrow in FIG. 9, the “section” is a section on the side of the suspending material 2 on the side surface of the field ledge 5 and the intersection of the line far from the suspending material 2 and the field ledge 5 in the lower end surface of the brace 81. Point to. The additional field edge 9 should just be arrange | positioned in this area in the state where the part of the width direction overlapped on the plane. When the braces 81, 81 in the axial direction are paired with the suspension member 2 interposed therebetween, a part in the width direction of the additional field edge 9 only needs to overlap a section between the lower ends of the pair of braces 81, 81. .

  The connection between the additional field edge and the field edge receiver is performed, for example, by welding, or by passing a hardware to both and screwing in a bolt (screw). Since the additional field edge has the same function as the field edge, the additional field edge is arranged in a state where it can contact the upper surface of the ceiling material, and is supported by being connected to the field edge receiver. The additional field edge is added (added) to the field edge that supports the existing ceiling material for the purpose of seismic reinforcement, and is added to enhance the earthquake resistance of the ceiling along with the newly constructed ceiling field edge. May be added.

  As described above, the horizontal force from the ceiling material acts alternately on the field receiver in the axial direction of the field receiver, and under the situation where the vibration speed is large, the lower end of the suspension material and There is a possibility that a compressive force acts on a section between the lower ends of the braces in the axial direction or a section between the lower ends of the braces that form a pair. For this compressive force, the additional field edge is arranged in the section between the lower end of the suspension material and the lower end of the brace, so that the additional field edge reduces the buckling length of this section. It works to prevent the buckling of the entire receiver. The additional field edge also overlaps a part of the section of the field receiver between the lower end of the suspension and the lower end of the brace, thereby increasing the thickness of the overlapping section. It also works to prevent local buckling.

  Since the additional field edge is additionally installed with respect to the field edge, the additional field edge is disposed in the middle portion between adjacent field edges on the lower surface side of the field edge receiver, and is connected to the ceiling material (Claim 2). And may not be connected. When the additional field edge 9 is connected to the ceiling member 7 (Claim 2), the field edge receiver 5 receives a torsional moment from the brace 82 in the width direction as shown in FIG. Sometimes, since the additional field edge 9 is connected to the ceiling member 7, it can act to prevent the torsional deformation of the field edge receiver 5. Demonstrate the effect of preventing.

  When the horizontal force in the width direction of the field receiver 5 acts on the ceiling member 7 as described above, the horizontal force transmitted from the field edge 6 to the field receiver 5 is connected to the upper surface side of the field receiver 5. The horizontal component of the reaction force from the braces 82 in the width direction acts on the field receiver 5. It is assumed that this horizontal component forms a couple with the horizontal force from the field edge 6 and causes a torsional moment to act on the field edge receiver 5. On the other hand, as shown in FIG. 10, the additional field edge 9 is disposed in the middle portion between the adjacent field edges 6, 6, and is connected to the field edge receiver 5 and the ceiling material 7. It is possible to function so as to prevent torsional deformation.

  It is conceivable that the additional field edge 9 is connected to the ceiling material 7 together with the field edge receiver 5 to cause the horizontal force in the width direction of the field edge receiver 5 acting on the ceiling material 7 to act on the field edge receiver 5. Since the brace 82 in the direction is connected to the lower surface side opposite to the upper surface side of the field receiver 5, the brace 82 can resist a couple force that generates a torsional moment. It resists the moment and works to prevent the torsional deformation of the field receiver 5. In particular, if the additional field edge 9 is arranged in the same plane as the braces 82 and 82 in the width direction, the direction of the reaction force generated in the additional field edge 9 (the width direction of the field receiver 5) is the same as that of the braces 82 and 82. Since it coincides with the direction of the horizontal component of the reaction force, it is possible to most effectively resist the torsional moment caused by the braces 82, 82.

  In the axial direction of the field receiver 5, buckling is prevented in the section between the lower end of the suspension member 2 and the lower end of the brace 81 in the axial direction, and the torsional deformation of the field receiver 5 is prevented in the width direction. Since the possibility that the joint portion between the field edge 6 and the ceiling material 7 and the joint portion between the ceiling materials 7 and 7 will be damaged is reduced by the prevention, the joint portion and the ceiling material 7 itself vibrate. It becomes possible to keep it healthy later.

  The brace 82 in the width direction may be disposed only on one side of the suspension member 2 and may be paired with the suspension member 2 interposed therebetween, but the lower end portion of the brace 82 is connected to the field receiver 5 or It is connected to the following additional field receiver 11 connected to the upper surface side of the field receiver 5 in a pair with the additional field edge 9.

  When a brace 82 in the width direction is installed above the additional field edge 9, in order to receive the lower end portion of the brace 82, a direction intersecting the axial direction of the field edge receiver 5 (such as the width direction of the field edge receiver) ) May be disposed with the axial direction directed toward (). The additional field edge receiver 11 is disposed on the field edge receiver 5 in parallel with the additional field edge 9, and is directly or indirectly connected to the upper surface side of the field edge receiver 5. In this case, the brace 82 in the width direction is directly or indirectly connected to the additional field receiver 11 as shown in FIG.

  The additional field edge receiver 11 is arranged facing the width direction of the field edge receiver 5 (such as the axial direction of the field edge 6), and is connected to the lower end portion of the brace 82 in the width direction that is laid between the frame 1 and the frame. Thus, the horizontal force from the ceiling material 7 acting in the width direction of the field receiver 5 is transmitted to the brace 82 in the width direction via the field receiver 5, and at the same time, the reaction force from the brace 82 is transmitted to the field receiver 5 To communicate. As shown in FIGS. 1 and 5, the additional field edge receiver 11 is constructed across a plurality of field edge receivers 5, 5 adjacent to (in parallel with) the width direction of the field edge receiver 5. 5 is connected to the upper surface side of the field receiver 5, the horizontal force in the six directions of the field edge is applied to the plurality of field receivers 5, 5 across the additional field receiver 11. In order to disperse, it also functions as a pair with the additional field edge 9 to restrain the torsional deformation of the field edge receiver 5.

  When the field edge receiver 5 is torsionally deformed by receiving a reaction force from the brace 82 in the width direction connected to the upper surface side, it is connected to the lower surface side of the field edge receiver 5 as described above, The connected additional edge 9 tries to prevent torsional deformation. The additional field edge receiver 11 connected to the upper surface side of the field edge receiver 5 spans between a plurality of adjacent field edge receivers 5, 5, and similarly to the additional field edge 9 connected to the ceiling material 7. Since it is in a state that can resist the torsional deformation of the edge receiver 5, it is paired with the additional field edge 9 that sandwiches the field receiver 5 from above and below to prevent torsional deformation of the field receiver 5. The additional field edge 11 is paired with the additional field edge 9, so that it is added (added) to the existing field edge 5 for the purpose of seismic reinforcement and the newly constructed ceiling field edge 5 At the same time, it may be added as an auxiliary.

  By arranging an additional field edge in the section between the lower end part of the suspension material and the lower end part of the brace and connecting to the field edge receiver, the additional field edge is the field edge receiver, the suspension material lower end part and the brace lower end part In order to shorten the buckling length of the section between, it is possible to prevent the entire buckling of the section between the suspension material lower end portion and the brace lower end portion of the field edge receiver. Further, when the additional field edge is connected to the field edge receiver, when the additional field edge is connected to the ceiling material (Claim 2), the additional field edge resists the torsional moment acting on the field edge receiver, and the field edge receiver is twisted. In order to prevent deformation, it is also possible to prevent torsional deformation in the section between the lower end of the suspension member and the lower end of the brace of the field receiver.

As a result of preventing the buckling and torsional deformation in the section between the lower end of the suspension material and the lower end of the brace by connecting the additional field edge to the field edge receiver, the joint between the field edge and the ceiling material In addition, since damage to the joints between the ceiling members and the like can be prevented, the joints and the ceiling members themselves can be kept sound after vibration.

An additional field edge having a length extending over three field edge supports arranged in parallel in the axial direction of the field edge is arranged on the lower surface side of the field edge receiver, and the additional field edge paired with the additional field edge is It is the perspective view which showed the relationship between a suspension material, a brace, an additional field edge, and an additional field edge receiver when arrange | positioning on the upper surface side. It is the longitudinal cross-sectional view which looked at the additional field edge and the additional field edge receiver in FIG. 1 in the axial direction of the additional field edge. It is a top view of FIG. It is the longitudinal cross-sectional view which showed the example at the time of using the steel material (square steel pipe) which a brace is arrange | positioned only on the one side of a suspension material and can bear compressive force for a suspension material. An additional field edge with a length that spans two field edge supports parallel to the axial direction of the field edge is placed on the lower surface side of the field edge receiver, and the additional field edge paired with the additional field edge is It is the perspective view which showed the relationship between a suspension material, a brace, an additional field edge, and an additional field edge receiver when arrange | positioning on the upper surface side. (A) is an elevation view showing the relationship between the fixing material fixed to the housing, the suspension material and the brace, and (b) is a state in which the field receiver is supported by the connecting material connected to the lower end of the suspension material. It is the perspective view which showed. It is the perspective view which showed the connection material which connects a field edge to a field edge receiver, the field edge receiver, and the relationship between a field edge. It is the perspective view which showed the relationship between the connection member which connects an additional field edge receiver to a field edge receiver, a field edge receiver, and an additional field edge receiver. It is the longitudinal cross-sectional view which showed the relationship between the lower end part of the brace laid in the surface direction including the axial direction of a field edge receiver, and the arrangement section of an additional field edge connected to the field edge receiver. (A) is the perspective view which showed a mode that the torsional moment acts on a field edge receiver from a field edge and a brace, (b) is the longitudinal cross-sectional view seen in the axial direction of the field edge receiver in (a). It is the perspective view which showed a mode that the additional field edge receiver which becomes a pair with an additional field edge on both sides of a field edge receiver was arrange | positioned on the upper surface side of a field edge receiver. (A) is an elevation view showing the relationship between a conventional suspension material, a field edge receiver and a brace, and (b) is an elevation view showing a state in which a steel material capable of bearing a compressive force is used for the suspension material. is there.

  FIG. 1 shows a suspended ceiling in which a field edge receiver 5 is supported at the lower end of a suspension member 2 suspended from a housing 1, and a field edge 6 that supports a ceiling material 7 is connected to the field edge receiver 5. An example of the seismic reinforcement structure in which the additional field edge 9 is arranged in the direction crossing the axial direction with the axial direction directed is shown. A brace 8 is installed on at least one side of the suspension member 2 between the housing 1 and the field edge receiver 5, and a lower end portion of the brace 8 is connected to the field edge receiver 5.

  The additional field edge 9 is arranged on the lower surface side of the field edge receiver 5 in the section between the lower end part of the suspension member 2 and the lower end part of the brace 8 in the entire length of the field edge receiver 5, and is connected to the field edge receiver 5. Is done. FIG. 1 shows an example in which the additional field edge 9 has a length straddling three field edge receivers 5 arranged in parallel in the axial direction of the field edge 6. 2 shows a longitudinal section of FIG. 1 viewed in the axial direction of the additional field 9, and FIG. 3 shows a plane of FIG. The brace 8 may be arranged in pairs on both sides of the suspension member 2 as shown in FIGS. 1 and 2, or may be arranged only on one side of the suspension member 2 as shown in FIG.

  The field edge receiver 5 is arranged on the ceiling member 7 with an interval in the axial direction of the field edge 6, and the suspension member 2 is arranged on the plane, on the line of the field edge receiver 5, as shown in FIG. Arranged at intervals in the axial direction. The upper end portion of the suspension member 2 is directly fixed to the housing 1 from the lower surface side by anchors, bolts, or the like, or the fixing material 3 is fixed (fixed) to the housing 1 from the lower end side as shown in FIG. Is supported by the housing 1 in a suspended state from the housing 1.

  The field edge receiver 5 is supported directly or indirectly on the lower end of the suspension member 2. The field edge receiver 5 may be connected to the lower end portion of the suspension member 2, and in that case, it is directly connected to the lower end portion of the suspension member 2 or the suspension member 2 of the suspension member 2 as shown in FIG. It connects with the connection material 4 connected to a lower end part. In order to avoid the eccentricity when the suspension member 2 supports the field receiver 5, the axis line (center line on the horizontal section) of the suspension member 2 is located on the axis line (center line) of the field receiver 5.

  For example, as shown in FIGS. 6B and 9, the connecting member 4 includes a connecting portion 4 a to which the lower end portion of the suspension member 2 is connected by screwing or the like, and a support portion 4 b that supports or holds the field receiver 5. The threaded part 2 is connected to the connecting part 4a by screwing the threaded part formed in the section of the lower end part of the suspended material 2 or passing through and fastening the nut. The support portion 4b supports or holds the field receiver 5 by, for example, a shape that sandwiches or surrounds the field receiver 5 in the width direction. In the drawing, a screw (bolt) 4c is passed between plate elements sandwiching the field receiver 5 of the support part 4b, and one end of the screw 4c is fastened to hold the field receiver 5 to the support part 4b. The form of the connecting material 4 is not limited. In the case of the illustrated example, the field receiver 5 is sandwiched and restrained by the support portion 4b in the width direction, so that it is substantially equivalent to a state where it is connected to the support portion 4b. The screw 4c may pass through the support portion 4b and the field receiver 5 similarly to a screw 12c attached to the connecting member 12 described later.

  As shown in FIG. 2, when the braces 8 and 8 are paired with the suspension member 2 interposed therebetween, the vertical components of the reaction force of the braces 8 and 8 cancel each other. It only needs to be able to bear a tensile force mainly during vibration, and is formed from a rod-shaped steel material such as a bolt or a reinforcing bar. When the brace 8 is disposed only on one side of the suspension member 2 as shown in FIG. 4, the suspension member 2 resists the vertical component of the reaction force of the brace 8 when the ceiling member 7 vibrates. In addition, since it is necessary to bear the compressive force, the suspension member 2 is made of a steel material that can resist compressive force, such as a steel pipe.

  The field edge 6 is arranged on the lower surface side of the field edge receiver 5 with an interval in the axial direction of the field edge receiver 5, and is directly connected to the field edge receiver 5 or connected to the field edge receiver 5. Connected to the material 10. The field edge 6 is arranged with its axial direction oriented in a direction intersecting the axis direction of the field edge receiver 5, such as a direction orthogonal to the axial direction of the field edge receiver 5 (width direction of the field edge receiver 5).

  The brace 8 is constructed in a composition direction including the axial direction of the field receiver 5 and a composition direction including a direction intersecting the axial direction such as the width direction of the field receiver 5. Hereinafter, the brace 8 installed in the composition direction including the axial direction of the field receiver 5 is referred to as an axial brace 81, and the brace is installed in the composition direction including the direction intersecting the axial direction of the field receiver 5. 8 is referred to as a brace 82 in the width direction.

  The upper end portion of the brace 8 (81, 82) is connected to a part of the fixing material 3 for connecting the upper end portion of the suspension member 2 to the housing 1, for example. As shown in FIG. 6A, the fixing material 3 has a shaft portion 3a for supporting the suspension material 2 on the lower surface of the housing 1, and a connecting portion 3b projecting from the brace 8 on the periphery thereof. The upper end portion of the brace 8 is connected to the portion 3b by a screw (bolt) 3c or the like. The connecting portions 3 b are formed by the number of braces 8 connected to the fixing material 3. The lower end portion of the brace 81 in the axial direction is directly connected to the side surface of the field receiver 5 as shown in FIGS. 1 and 2 or indirectly through a hardware such as a plate. As shown in FIGS. 1, 10, and 11, the lower end of the brace 82 in the width direction is directly on the field edge receiver 5 or directly on the additional field edge receiver 11 that is paired with the additional field edge 9 across the field edge receiver 5. Or indirectly through a hardware such as a plate.

  The lower ends of the braces 81 and 82 in each direction are related to the length of the suspension member 2, the distance between the suspension members 2 and 2 adjacent to each other in the axial direction of the field receiver 5, and the inclination angle of the braces 81 and 82 with respect to the horizontal plane. From FIG. 2 and FIG. 4, it connects to the position which put the distance in the axial direction of the field receiver 5 from the connection material 4 of the suspension material 2 lower end part. The inclination angle of the braces 81 and 82 with respect to the horizontal plane is set to about 30 to 45 ° so that the height of the ceiling pocket does not become larger than necessary.

  The additional field edge 9 is arranged in a section from the connecting member 4 to a connecting portion between the axial brace 81 and the field edge receiver 5. Like the field edge 6, the additional field edge 9 is disposed on the lower surface side of the field edge receiver 5, and is directly connected to the field edge receiver 5 or indirectly via the connecting material 10. In FIG. 1, FIG. 2, etc., the connection material which has the piece (plate element) for connection to both the lower flange of the field receiver 5 and the upper flange of the additional field edge 9, as shown in FIG. 10, the form of the connecting material 10 is not limited.

  The connecting material 10 shown in FIG. 7 has a shape suitable for light-weight shaped steel and shaped steel such as grooved steel (lip grooved steel) mainly used for the field edge receiver 5 and the field edge 6 as a ceiling base material. The upper plate 10a that overlaps the upper surface of the lower flange of the field edge receiver 5 and is joined by a screw (bolt) 10c, and the upper plate 10a while paired with the lower surface of the upper flange (lip) of the field edge 6 The lower plate 10b sandwiches the upper flange of the field edge 6. The lower plate 10b sandwiches the upper flange of the field edge 6 together with the upper plate 10a. The lower plate 10b is joined to the field edge 6 by a screw (bolt) 10c passing through both plates 10a and 10b, and at the same time to the field receiver 5. The

  The section from the connecting member 4 to the connecting portion between the brace 81 in the axial direction and the field edge receiver 5, which is the section in which the additional field edge 9 is arranged, is arranged in the width direction as shown in FIG. The section from the point where the surface (line) far from the connecting material 4 of the lower end of the brace 81 intersects with the field edge receiver 5 to the connecting material 4 is said. When the brace 8 is disposed only on one side of the suspension member 2, the additional field edge 9 is disposed in a section from the connecting member 4 to the lower end of the brace 81 as shown in FIG. 4, and the braces 81 and 81 connect the connecting member 4. When arranged in pairs, the additional field edge 9 is formed at the intersection of the lower end portion of the brace 81 on one side and the field edge receiver 5 with the connecting member 4 interposed therebetween as shown in FIG. The brace 81 is arranged in a section between the lower end of the brace 81 and the intersection of the field edge receiver 5.

  1 and 2 show the additional field edge 9 on the lower surface of the field receiver 5 so that the portion (point) of the upper surface of the additional field edge 9 on the side far from the connection material 4 is located closer to the connection material 4 than the axis of the brace 81. Although the additional field edge 9 is shown to be arranged on the side, the buckling length of the field edge receiver 5 from the connecting material 4 to the connection part with the brace 81 or the connection part between the both braces 81 and 81 is shown. In order to shorten the buckling length, it is only necessary that a part of the upper surface of the additional field edge 9 is located closer to the connecting member 4 than the axis of the brace 81.

  Possibility of buckling when the field receiver 5 bears an axial force is that the section from the connecting member 4 to the lower end of the brace 81 or both braces 81 is easily subjected to a compressive force due to the reaction force from the brace 81. , 81 is high between the lower end portions. From this, at least one of the additional field edges 9 in the width direction is formed at a part of the section connecting the lower edge portion of the brace 81 far from the connection material 4 and the field edge receiver 5 and the connection material 4. If the portions are arranged so as to overlap, the additional field edge 9 can reduce the buckling length of the field edge receiver 5, and the field edge receiver 5 can be prevented from buckling.

  Since the additional field edge 9 is arranged on the ceiling material 7, the ceiling material 7 may or may not be connected in the same manner as the field edge 6. When the additional field edge 9 is connected to the ceiling member 7, the additional field edge 9 tries to cause torsional deformation by the reaction force from the braces 82, 82 in the width direction connected to the field edge receiver 5. When it does, it has a function to restrain the torsional deformation.

  As shown in FIG. 10- (a), the horizontal force from the ceiling material 7 in the width direction of the field receiver 5 is transmitted to the lower surface side of the field receiver 5 through the field edge 6, and the field receiver 5 is connected to the upper surface side thereof. When receiving the reaction force from the generated braces 82 in the width direction, the field edge receiver 5 tries to rotate (torsional deformation) around the material axis. At this time, since the additional field edge 9 is connected to the lower surface side of the field edge receiver 5 and is connected to the ceiling member 7, it is possible to resist a torsional moment that tends to cause the field edge receiver 5 to rotate. Therefore, the rotation of the field edge receiver 5 is prevented.

  The braces 82, 82 in the width direction may be connected to the edge receiver 5 or the additional edge 9 as shown in FIG. 10, but in the example shown in FIG. In order to increase the width, the braces 82 and 82 in the width direction are connected to the additional field receiver 11 arranged on the field receiver 5. As shown in FIG. 11, the additional field edge receiver 11 is disposed on the field edge receiver 5 in parallel to the additional field edge 9 and perpendicular to the axial direction of the field edge receiver 5 so as to face the crossing direction. When the horizontal force from the ceiling material 7 acting in the width direction of the edge receiver 5 is transmitted to the braces 82, 82 in the width direction, the edge receiver 5 is sandwiched from above and below in pairs with the additional field edge 9, Restraining acts to prevent torsional deformation of the field receiver 5.

  When the additional field edge receiver 11 is disposed on the field edge receiver 5, a connecting member 12 for connecting the additional field edge receiver 11 is connected to the field edge receiver 5 as shown in FIG. 8. The connecting member 12 shown in FIG. 8 is welded to the holding part 12a and the holding part 12a connected to the field receiving part 5 by straddling the field receiving part 5 in the width direction or sandwiching and holding the same. Etc., projecting at least one side in the width direction of the field receiver 5 and having a joint portion 12b having a height at which the side surface of the additional field receiver 11 can contact, and is connected to the field receiver 5 at the holding portion 12a. The joined portion 12b is joined to the additional field receiver 11 with a screw (bolt) 12c or the like.

  In FIG. 8, similarly to the support portion 4b of the connecting member 4, the holding portion 12a is penetrated between the plate elements that sandwich the field edge receiver 5, and a screw (bolt) 12c is passed through, and one end of the screw 12c is fastened. The edge receiver 5 is held and connected. Although some screws 12c that penetrate the holding portion 12a penetrate the field receiver 5 in the width direction, the screws 12c that penetrate the field receiver 5 may be omitted.

  The additional field edge receiver 11 disperses and transmits the reaction force from the braces 82 and 82 in the width direction to the plurality of field edge receivers 5 and 5, so that a plurality of field edges parallel to the axial direction of the field edge 6 are provided. A pair of additional field edges 9 placed on the field edge receivers 5, 5 across the fields 5 and 5 and connected to the lower surface side of the field edge receiver 5, sandwiching the field edge receiver 5 in the height direction. Connected to the field receiver 5. The additional field edge receiver 11 sandwiches the field edge receiver 5 together with the additional field edge 9 while straddling the plurality of field edge receivers 5, 5, so that a torsional moment to be borne when the field edge receiver 5 is torsionally deforms is obtained. The effect of preventing the torsional deformation of the field edge receiver 5 is exhibited by sharing the plurality of field edge receivers 5 and 5.

  FIG. 5 shows an additional field edge 9 having a length extending over two field edge supports 5 and 5 parallel to the axial direction of the field edge 6 on the lower surface side of the field edge receiver 5, and the same two field edges. The additional field edge receiver 11 having a length extending over the receivers 5 and 5 and being paired with the additional field edge 9 is disposed on the upper surface side of the field edge receiver 5, and the additional field edge 9 and the additional field edge are connected via the connecting member 12. An example in which the receiver 11 is connected to the field receiver 5 is shown. In this example, as in the example shown in FIG. 1, the braces 81 and 81 in the axial direction are connected to the field receiver 5 via the connecting member 10, and the braces 82 and 82 in the width direction are connected to the additional field receiver 11. 12 is connected.

  Also in the example shown in FIG. 5, the additional field edge receiver 11 sandwiches the field edge receiver 5 together with the additional field edge 9 and straddles the two field edge receivers 5, so that the torsional moment that the field edge receiver 5 bears is 2 The effect of preventing the torsional deformation of the field edge receiver 5 by sharing the book with the field edge receivers 5 and 5 is exhibited.

1 ...
2 ... Suspension material, 3 ... Fixing material, 3a ... Shaft part, 3b ... Connection part,
4 …… Connecting material, 4a …… Connecting part, 4b …… Supporting part, 4c …… Screw,
5 ... Noboshi, 6 ... Nobori, 7 ... Ceiling material,
8 …… Brace, 81 …… Axial brace, 82 …… Width brace,
9 …… Additional field edge,
10 ... Connecting material, 10a ... Upper plate, 10b ... Lower plate, 10c ... Screw,
11 …… Additional field reception,
12: Connecting member, 12a: Holding portion, 12b: Joining portion, 12c: Screw.

Claims (3)

A field receiver is supported at the lower end of the suspension member suspended from the frame, and a field edge that supports the ceiling material is connected to the field receiver, and at least one side of the suspension material is between the frame and the field receiver. In a suspended ceiling in which a brace is erected and the lower end of this brace is connected to the field edge receiver,
An additional field edge is arranged in the section between the lower end portion of the suspension member and the lower end portion of the brace, with the field direction facing the axial direction in the direction intersecting the axial direction of the field edge receiver. And a seismic reinforcement structure for a suspended ceiling, wherein the suspension ceiling is connected to the field receiver.   The seismic reinforcement structure for a suspended ceiling according to claim 1, wherein the additional field edge is disposed on a lower surface side of the field edge receiver and connected to the ceiling material. The suspended ceiling according to claim 1, wherein an additional field receiver is disposed on the field receiver in parallel with the additional field edge and connected to the field receiver. Seismic reinforcement structure.

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